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Linus Walleij8d318a52010-03-30 15:33:42 +02001/*
Per Forlind49278e2010-12-20 18:31:38 +01002 * Copyright (C) Ericsson AB 2007-2008
3 * Copyright (C) ST-Ericsson SA 2008-2010
Per Forlin661385f2010-10-06 09:05:28 +00004 * Author: Per Forlin <per.forlin@stericsson.com> for ST-Ericsson
Jonas Aaberg767a9672010-08-09 12:08:34 +00005 * Author: Jonas Aaberg <jonas.aberg@stericsson.com> for ST-Ericsson
Linus Walleij8d318a52010-03-30 15:33:42 +02006 * License terms: GNU General Public License (GPL) version 2
Linus Walleij8d318a52010-03-30 15:33:42 +02007 */
8
Alexey Dobriyanb7f080c2011-06-16 11:01:34 +00009#include <linux/dma-mapping.h>
Linus Walleij8d318a52010-03-30 15:33:42 +020010#include <linux/kernel.h>
11#include <linux/slab.h>
Paul Gortmakerf492b212011-07-31 16:17:36 -040012#include <linux/export.h>
Linus Walleij8d318a52010-03-30 15:33:42 +020013#include <linux/dmaengine.h>
14#include <linux/platform_device.h>
15#include <linux/clk.h>
16#include <linux/delay.h>
Guennadi Liakhovetskic95905a2013-09-18 09:33:08 +020017#include <linux/log2.h>
Narayanan G7fb3e752011-11-17 17:26:41 +053018#include <linux/pm.h>
19#include <linux/pm_runtime.h>
Jonas Aaberg698e4732010-08-09 12:08:56 +000020#include <linux/err.h>
Lee Jones1814a172013-05-03 15:32:11 +010021#include <linux/of.h>
Lee Jonesfa332de2013-05-03 15:32:12 +010022#include <linux/of_dma.h>
Linus Walleijf4b89762011-06-27 11:33:46 +020023#include <linux/amba/bus.h>
Linus Walleij15e4b782012-04-12 18:12:43 +020024#include <linux/regulator/consumer.h>
Linus Walleij865fab62012-10-18 14:20:16 +020025#include <linux/platform_data/dma-ste-dma40.h>
Linus Walleij8d318a52010-03-30 15:33:42 +020026
Russell King - ARM Linuxd2ebfb32012-03-06 22:34:26 +000027#include "dmaengine.h"
Linus Walleij8d318a52010-03-30 15:33:42 +020028#include "ste_dma40_ll.h"
29
30#define D40_NAME "dma40"
31
32#define D40_PHY_CHAN -1
33
34/* For masking out/in 2 bit channel positions */
35#define D40_CHAN_POS(chan) (2 * (chan / 2))
36#define D40_CHAN_POS_MASK(chan) (0x3 << D40_CHAN_POS(chan))
37
38/* Maximum iterations taken before giving up suspending a channel */
39#define D40_SUSPEND_MAX_IT 500
40
Narayanan G7fb3e752011-11-17 17:26:41 +053041/* Milliseconds */
42#define DMA40_AUTOSUSPEND_DELAY 100
43
Linus Walleij508849a2010-06-20 21:26:07 +000044/* Hardware requirement on LCLA alignment */
45#define LCLA_ALIGNMENT 0x40000
Jonas Aaberg698e4732010-08-09 12:08:56 +000046
47/* Max number of links per event group */
48#define D40_LCLA_LINK_PER_EVENT_GRP 128
49#define D40_LCLA_END D40_LCLA_LINK_PER_EVENT_GRP
50
Lee Jonesdb72da92013-05-03 15:32:03 +010051/* Max number of logical channels per physical channel */
52#define D40_MAX_LOG_CHAN_PER_PHY 32
53
Linus Walleij508849a2010-06-20 21:26:07 +000054/* Attempts before giving up to trying to get pages that are aligned */
55#define MAX_LCLA_ALLOC_ATTEMPTS 256
56
57/* Bit markings for allocation map */
Lee Jones8a3b6e12013-05-15 10:51:52 +010058#define D40_ALLOC_FREE BIT(31)
59#define D40_ALLOC_PHY BIT(30)
Linus Walleij8d318a52010-03-30 15:33:42 +020060#define D40_ALLOC_LOG_FREE 0
61
Lee Jonesa7dacb62013-05-15 10:51:59 +010062#define D40_MEMCPY_MAX_CHANS 8
63
Lee Jones664a57e2013-05-03 15:31:53 +010064/* Reserved event lines for memcpy only. */
Linus Walleija2acaa22013-05-03 21:46:09 +020065#define DB8500_DMA_MEMCPY_EV_0 51
66#define DB8500_DMA_MEMCPY_EV_1 56
67#define DB8500_DMA_MEMCPY_EV_2 57
68#define DB8500_DMA_MEMCPY_EV_3 58
69#define DB8500_DMA_MEMCPY_EV_4 59
70#define DB8500_DMA_MEMCPY_EV_5 60
71
72static int dma40_memcpy_channels[] = {
73 DB8500_DMA_MEMCPY_EV_0,
74 DB8500_DMA_MEMCPY_EV_1,
75 DB8500_DMA_MEMCPY_EV_2,
76 DB8500_DMA_MEMCPY_EV_3,
77 DB8500_DMA_MEMCPY_EV_4,
78 DB8500_DMA_MEMCPY_EV_5,
79};
Lee Jones664a57e2013-05-03 15:31:53 +010080
Lee Jones29027a12013-05-03 15:31:54 +010081/* Default configuration for physcial memcpy */
Fabio Baltierib4a1ccd2013-06-20 11:17:39 +020082static struct stedma40_chan_cfg dma40_memcpy_conf_phy = {
Lee Jones29027a12013-05-03 15:31:54 +010083 .mode = STEDMA40_MODE_PHYSICAL,
Lee Jones2c2b62d2013-05-15 10:51:54 +010084 .dir = DMA_MEM_TO_MEM,
Lee Jones29027a12013-05-03 15:31:54 +010085
Lee Jones43f2e1a2013-05-15 11:51:57 +020086 .src_info.data_width = DMA_SLAVE_BUSWIDTH_1_BYTE,
Lee Jones29027a12013-05-03 15:31:54 +010087 .src_info.psize = STEDMA40_PSIZE_PHY_1,
88 .src_info.flow_ctrl = STEDMA40_NO_FLOW_CTRL,
89
Lee Jones43f2e1a2013-05-15 11:51:57 +020090 .dst_info.data_width = DMA_SLAVE_BUSWIDTH_1_BYTE,
Lee Jones29027a12013-05-03 15:31:54 +010091 .dst_info.psize = STEDMA40_PSIZE_PHY_1,
92 .dst_info.flow_ctrl = STEDMA40_NO_FLOW_CTRL,
93};
94
95/* Default configuration for logical memcpy */
Fabio Baltierib4a1ccd2013-06-20 11:17:39 +020096static struct stedma40_chan_cfg dma40_memcpy_conf_log = {
Lee Jones29027a12013-05-03 15:31:54 +010097 .mode = STEDMA40_MODE_LOGICAL,
Lee Jones2c2b62d2013-05-15 10:51:54 +010098 .dir = DMA_MEM_TO_MEM,
Lee Jones29027a12013-05-03 15:31:54 +010099
Lee Jones43f2e1a2013-05-15 11:51:57 +0200100 .src_info.data_width = DMA_SLAVE_BUSWIDTH_1_BYTE,
Lee Jones29027a12013-05-03 15:31:54 +0100101 .src_info.psize = STEDMA40_PSIZE_LOG_1,
102 .src_info.flow_ctrl = STEDMA40_NO_FLOW_CTRL,
103
Lee Jones43f2e1a2013-05-15 11:51:57 +0200104 .dst_info.data_width = DMA_SLAVE_BUSWIDTH_1_BYTE,
Lee Jones29027a12013-05-03 15:31:54 +0100105 .dst_info.psize = STEDMA40_PSIZE_LOG_1,
106 .dst_info.flow_ctrl = STEDMA40_NO_FLOW_CTRL,
107};
108
Linus Walleij8d318a52010-03-30 15:33:42 +0200109/**
110 * enum 40_command - The different commands and/or statuses.
111 *
112 * @D40_DMA_STOP: DMA channel command STOP or status STOPPED,
113 * @D40_DMA_RUN: The DMA channel is RUNNING of the command RUN.
114 * @D40_DMA_SUSPEND_REQ: Request the DMA to SUSPEND as soon as possible.
115 * @D40_DMA_SUSPENDED: The DMA channel is SUSPENDED.
116 */
117enum d40_command {
118 D40_DMA_STOP = 0,
119 D40_DMA_RUN = 1,
120 D40_DMA_SUSPEND_REQ = 2,
121 D40_DMA_SUSPENDED = 3
122};
123
Narayanan G7fb3e752011-11-17 17:26:41 +0530124/*
Narayanan G1bdae6f2012-02-09 12:41:37 +0530125 * enum d40_events - The different Event Enables for the event lines.
126 *
127 * @D40_DEACTIVATE_EVENTLINE: De-activate Event line, stopping the logical chan.
128 * @D40_ACTIVATE_EVENTLINE: Activate the Event line, to start a logical chan.
129 * @D40_SUSPEND_REQ_EVENTLINE: Requesting for suspending a event line.
130 * @D40_ROUND_EVENTLINE: Status check for event line.
131 */
132
133enum d40_events {
134 D40_DEACTIVATE_EVENTLINE = 0,
135 D40_ACTIVATE_EVENTLINE = 1,
136 D40_SUSPEND_REQ_EVENTLINE = 2,
137 D40_ROUND_EVENTLINE = 3
138};
139
140/*
Narayanan G7fb3e752011-11-17 17:26:41 +0530141 * These are the registers that has to be saved and later restored
142 * when the DMA hw is powered off.
143 * TODO: Add save/restore of D40_DREG_GCC on dma40 v3 or later, if that works.
144 */
145static u32 d40_backup_regs[] = {
146 D40_DREG_LCPA,
147 D40_DREG_LCLA,
148 D40_DREG_PRMSE,
149 D40_DREG_PRMSO,
150 D40_DREG_PRMOE,
151 D40_DREG_PRMOO,
152};
153
154#define BACKUP_REGS_SZ ARRAY_SIZE(d40_backup_regs)
155
Tong Liu3cb645d2012-09-26 10:07:30 +0000156/*
157 * since 9540 and 8540 has the same HW revision
158 * use v4a for 9540 or ealier
159 * use v4b for 8540 or later
160 * HW revision:
161 * DB8500ed has revision 0
162 * DB8500v1 has revision 2
163 * DB8500v2 has revision 3
164 * AP9540v1 has revision 4
165 * DB8540v1 has revision 4
166 * TODO: Check if all these registers have to be saved/restored on dma40 v4a
167 */
168static u32 d40_backup_regs_v4a[] = {
Narayanan G7fb3e752011-11-17 17:26:41 +0530169 D40_DREG_PSEG1,
170 D40_DREG_PSEG2,
171 D40_DREG_PSEG3,
172 D40_DREG_PSEG4,
173 D40_DREG_PCEG1,
174 D40_DREG_PCEG2,
175 D40_DREG_PCEG3,
176 D40_DREG_PCEG4,
177 D40_DREG_RSEG1,
178 D40_DREG_RSEG2,
179 D40_DREG_RSEG3,
180 D40_DREG_RSEG4,
181 D40_DREG_RCEG1,
182 D40_DREG_RCEG2,
183 D40_DREG_RCEG3,
184 D40_DREG_RCEG4,
185};
186
Tong Liu3cb645d2012-09-26 10:07:30 +0000187#define BACKUP_REGS_SZ_V4A ARRAY_SIZE(d40_backup_regs_v4a)
188
189static u32 d40_backup_regs_v4b[] = {
190 D40_DREG_CPSEG1,
191 D40_DREG_CPSEG2,
192 D40_DREG_CPSEG3,
193 D40_DREG_CPSEG4,
194 D40_DREG_CPSEG5,
195 D40_DREG_CPCEG1,
196 D40_DREG_CPCEG2,
197 D40_DREG_CPCEG3,
198 D40_DREG_CPCEG4,
199 D40_DREG_CPCEG5,
200 D40_DREG_CRSEG1,
201 D40_DREG_CRSEG2,
202 D40_DREG_CRSEG3,
203 D40_DREG_CRSEG4,
204 D40_DREG_CRSEG5,
205 D40_DREG_CRCEG1,
206 D40_DREG_CRCEG2,
207 D40_DREG_CRCEG3,
208 D40_DREG_CRCEG4,
209 D40_DREG_CRCEG5,
210};
211
212#define BACKUP_REGS_SZ_V4B ARRAY_SIZE(d40_backup_regs_v4b)
Narayanan G7fb3e752011-11-17 17:26:41 +0530213
214static u32 d40_backup_regs_chan[] = {
215 D40_CHAN_REG_SSCFG,
216 D40_CHAN_REG_SSELT,
217 D40_CHAN_REG_SSPTR,
218 D40_CHAN_REG_SSLNK,
219 D40_CHAN_REG_SDCFG,
220 D40_CHAN_REG_SDELT,
221 D40_CHAN_REG_SDPTR,
222 D40_CHAN_REG_SDLNK,
223};
224
Lee Jones84b3da12013-05-03 15:31:58 +0100225#define BACKUP_REGS_SZ_MAX ((BACKUP_REGS_SZ_V4A > BACKUP_REGS_SZ_V4B) ? \
226 BACKUP_REGS_SZ_V4A : BACKUP_REGS_SZ_V4B)
227
Linus Walleij8d318a52010-03-30 15:33:42 +0200228/**
Tong Liu3cb645d2012-09-26 10:07:30 +0000229 * struct d40_interrupt_lookup - lookup table for interrupt handler
230 *
231 * @src: Interrupt mask register.
232 * @clr: Interrupt clear register.
233 * @is_error: true if this is an error interrupt.
234 * @offset: start delta in the lookup_log_chans in d40_base. If equals to
235 * D40_PHY_CHAN, the lookup_phy_chans shall be used instead.
236 */
237struct d40_interrupt_lookup {
238 u32 src;
239 u32 clr;
240 bool is_error;
241 int offset;
242};
243
244
245static struct d40_interrupt_lookup il_v4a[] = {
246 {D40_DREG_LCTIS0, D40_DREG_LCICR0, false, 0},
247 {D40_DREG_LCTIS1, D40_DREG_LCICR1, false, 32},
248 {D40_DREG_LCTIS2, D40_DREG_LCICR2, false, 64},
249 {D40_DREG_LCTIS3, D40_DREG_LCICR3, false, 96},
250 {D40_DREG_LCEIS0, D40_DREG_LCICR0, true, 0},
251 {D40_DREG_LCEIS1, D40_DREG_LCICR1, true, 32},
252 {D40_DREG_LCEIS2, D40_DREG_LCICR2, true, 64},
253 {D40_DREG_LCEIS3, D40_DREG_LCICR3, true, 96},
254 {D40_DREG_PCTIS, D40_DREG_PCICR, false, D40_PHY_CHAN},
255 {D40_DREG_PCEIS, D40_DREG_PCICR, true, D40_PHY_CHAN},
256};
257
258static struct d40_interrupt_lookup il_v4b[] = {
259 {D40_DREG_CLCTIS1, D40_DREG_CLCICR1, false, 0},
260 {D40_DREG_CLCTIS2, D40_DREG_CLCICR2, false, 32},
261 {D40_DREG_CLCTIS3, D40_DREG_CLCICR3, false, 64},
262 {D40_DREG_CLCTIS4, D40_DREG_CLCICR4, false, 96},
263 {D40_DREG_CLCTIS5, D40_DREG_CLCICR5, false, 128},
264 {D40_DREG_CLCEIS1, D40_DREG_CLCICR1, true, 0},
265 {D40_DREG_CLCEIS2, D40_DREG_CLCICR2, true, 32},
266 {D40_DREG_CLCEIS3, D40_DREG_CLCICR3, true, 64},
267 {D40_DREG_CLCEIS4, D40_DREG_CLCICR4, true, 96},
268 {D40_DREG_CLCEIS5, D40_DREG_CLCICR5, true, 128},
269 {D40_DREG_CPCTIS, D40_DREG_CPCICR, false, D40_PHY_CHAN},
270 {D40_DREG_CPCEIS, D40_DREG_CPCICR, true, D40_PHY_CHAN},
271};
272
273/**
274 * struct d40_reg_val - simple lookup struct
275 *
276 * @reg: The register.
277 * @val: The value that belongs to the register in reg.
278 */
279struct d40_reg_val {
280 unsigned int reg;
281 unsigned int val;
282};
283
284static __initdata struct d40_reg_val dma_init_reg_v4a[] = {
285 /* Clock every part of the DMA block from start */
286 { .reg = D40_DREG_GCC, .val = D40_DREG_GCC_ENABLE_ALL},
287
288 /* Interrupts on all logical channels */
289 { .reg = D40_DREG_LCMIS0, .val = 0xFFFFFFFF},
290 { .reg = D40_DREG_LCMIS1, .val = 0xFFFFFFFF},
291 { .reg = D40_DREG_LCMIS2, .val = 0xFFFFFFFF},
292 { .reg = D40_DREG_LCMIS3, .val = 0xFFFFFFFF},
293 { .reg = D40_DREG_LCICR0, .val = 0xFFFFFFFF},
294 { .reg = D40_DREG_LCICR1, .val = 0xFFFFFFFF},
295 { .reg = D40_DREG_LCICR2, .val = 0xFFFFFFFF},
296 { .reg = D40_DREG_LCICR3, .val = 0xFFFFFFFF},
297 { .reg = D40_DREG_LCTIS0, .val = 0xFFFFFFFF},
298 { .reg = D40_DREG_LCTIS1, .val = 0xFFFFFFFF},
299 { .reg = D40_DREG_LCTIS2, .val = 0xFFFFFFFF},
300 { .reg = D40_DREG_LCTIS3, .val = 0xFFFFFFFF}
301};
302static __initdata struct d40_reg_val dma_init_reg_v4b[] = {
303 /* Clock every part of the DMA block from start */
304 { .reg = D40_DREG_GCC, .val = D40_DREG_GCC_ENABLE_ALL},
305
306 /* Interrupts on all logical channels */
307 { .reg = D40_DREG_CLCMIS1, .val = 0xFFFFFFFF},
308 { .reg = D40_DREG_CLCMIS2, .val = 0xFFFFFFFF},
309 { .reg = D40_DREG_CLCMIS3, .val = 0xFFFFFFFF},
310 { .reg = D40_DREG_CLCMIS4, .val = 0xFFFFFFFF},
311 { .reg = D40_DREG_CLCMIS5, .val = 0xFFFFFFFF},
312 { .reg = D40_DREG_CLCICR1, .val = 0xFFFFFFFF},
313 { .reg = D40_DREG_CLCICR2, .val = 0xFFFFFFFF},
314 { .reg = D40_DREG_CLCICR3, .val = 0xFFFFFFFF},
315 { .reg = D40_DREG_CLCICR4, .val = 0xFFFFFFFF},
316 { .reg = D40_DREG_CLCICR5, .val = 0xFFFFFFFF},
317 { .reg = D40_DREG_CLCTIS1, .val = 0xFFFFFFFF},
318 { .reg = D40_DREG_CLCTIS2, .val = 0xFFFFFFFF},
319 { .reg = D40_DREG_CLCTIS3, .val = 0xFFFFFFFF},
320 { .reg = D40_DREG_CLCTIS4, .val = 0xFFFFFFFF},
321 { .reg = D40_DREG_CLCTIS5, .val = 0xFFFFFFFF}
322};
323
324/**
Linus Walleij8d318a52010-03-30 15:33:42 +0200325 * struct d40_lli_pool - Structure for keeping LLIs in memory
326 *
327 * @base: Pointer to memory area when the pre_alloc_lli's are not large
328 * enough, IE bigger than the most common case, 1 dst and 1 src. NULL if
329 * pre_alloc_lli is used.
Rabin Vincentb00f9382011-01-25 11:18:15 +0100330 * @dma_addr: DMA address, if mapped
Linus Walleij8d318a52010-03-30 15:33:42 +0200331 * @size: The size in bytes of the memory at base or the size of pre_alloc_lli.
332 * @pre_alloc_lli: Pre allocated area for the most common case of transfers,
333 * one buffer to one buffer.
334 */
335struct d40_lli_pool {
336 void *base;
Linus Walleij508849a2010-06-20 21:26:07 +0000337 int size;
Rabin Vincentb00f9382011-01-25 11:18:15 +0100338 dma_addr_t dma_addr;
Linus Walleij8d318a52010-03-30 15:33:42 +0200339 /* Space for dst and src, plus an extra for padding */
Linus Walleij508849a2010-06-20 21:26:07 +0000340 u8 pre_alloc_lli[3 * sizeof(struct d40_phy_lli)];
Linus Walleij8d318a52010-03-30 15:33:42 +0200341};
342
343/**
344 * struct d40_desc - A descriptor is one DMA job.
345 *
346 * @lli_phy: LLI settings for physical channel. Both src and dst=
347 * points into the lli_pool, to base if lli_len > 1 or to pre_alloc_lli if
348 * lli_len equals one.
349 * @lli_log: Same as above but for logical channels.
350 * @lli_pool: The pool with two entries pre-allocated.
Per Friden941b77a2010-06-20 21:24:45 +0000351 * @lli_len: Number of llis of current descriptor.
Lucas De Marchi25985ed2011-03-30 22:57:33 -0300352 * @lli_current: Number of transferred llis.
Jonas Aaberg698e4732010-08-09 12:08:56 +0000353 * @lcla_alloc: Number of LCLA entries allocated.
Linus Walleij8d318a52010-03-30 15:33:42 +0200354 * @txd: DMA engine struct. Used for among other things for communication
355 * during a transfer.
356 * @node: List entry.
Linus Walleij8d318a52010-03-30 15:33:42 +0200357 * @is_in_client_list: true if the client owns this descriptor.
Narayanan G7fb3e752011-11-17 17:26:41 +0530358 * @cyclic: true if this is a cyclic job
Linus Walleij8d318a52010-03-30 15:33:42 +0200359 *
360 * This descriptor is used for both logical and physical transfers.
361 */
Linus Walleij8d318a52010-03-30 15:33:42 +0200362struct d40_desc {
363 /* LLI physical */
364 struct d40_phy_lli_bidir lli_phy;
365 /* LLI logical */
366 struct d40_log_lli_bidir lli_log;
367
368 struct d40_lli_pool lli_pool;
Per Friden941b77a2010-06-20 21:24:45 +0000369 int lli_len;
Jonas Aaberg698e4732010-08-09 12:08:56 +0000370 int lli_current;
371 int lcla_alloc;
Linus Walleij8d318a52010-03-30 15:33:42 +0200372
373 struct dma_async_tx_descriptor txd;
374 struct list_head node;
375
Linus Walleij8d318a52010-03-30 15:33:42 +0200376 bool is_in_client_list;
Rabin Vincent0c842b52011-01-25 11:18:35 +0100377 bool cyclic;
Linus Walleij8d318a52010-03-30 15:33:42 +0200378};
379
380/**
381 * struct d40_lcla_pool - LCLA pool settings and data.
382 *
Linus Walleij508849a2010-06-20 21:26:07 +0000383 * @base: The virtual address of LCLA. 18 bit aligned.
384 * @base_unaligned: The orignal kmalloc pointer, if kmalloc is used.
385 * This pointer is only there for clean-up on error.
386 * @pages: The number of pages needed for all physical channels.
387 * Only used later for clean-up on error
Linus Walleij8d318a52010-03-30 15:33:42 +0200388 * @lock: Lock to protect the content in this struct.
Jonas Aaberg698e4732010-08-09 12:08:56 +0000389 * @alloc_map: big map over which LCLA entry is own by which job.
Linus Walleij8d318a52010-03-30 15:33:42 +0200390 */
391struct d40_lcla_pool {
392 void *base;
Rabin Vincent026cbc42011-01-25 11:18:14 +0100393 dma_addr_t dma_addr;
Linus Walleij508849a2010-06-20 21:26:07 +0000394 void *base_unaligned;
395 int pages;
Linus Walleij8d318a52010-03-30 15:33:42 +0200396 spinlock_t lock;
Jonas Aaberg698e4732010-08-09 12:08:56 +0000397 struct d40_desc **alloc_map;
Linus Walleij8d318a52010-03-30 15:33:42 +0200398};
399
400/**
401 * struct d40_phy_res - struct for handling eventlines mapped to physical
402 * channels.
403 *
404 * @lock: A lock protection this entity.
Narayanan G7fb3e752011-11-17 17:26:41 +0530405 * @reserved: True if used by secure world or otherwise.
Linus Walleij8d318a52010-03-30 15:33:42 +0200406 * @num: The physical channel number of this entity.
407 * @allocated_src: Bit mapped to show which src event line's are mapped to
408 * this physical channel. Can also be free or physically allocated.
409 * @allocated_dst: Same as for src but is dst.
410 * allocated_dst and allocated_src uses the D40_ALLOC* defines as well as
Jonas Aaberg767a9672010-08-09 12:08:34 +0000411 * event line number.
Fabio Baltieri74070482012-12-18 12:25:14 +0100412 * @use_soft_lli: To mark if the linked lists of channel are managed by SW.
Linus Walleij8d318a52010-03-30 15:33:42 +0200413 */
414struct d40_phy_res {
415 spinlock_t lock;
Narayanan G7fb3e752011-11-17 17:26:41 +0530416 bool reserved;
Linus Walleij8d318a52010-03-30 15:33:42 +0200417 int num;
418 u32 allocated_src;
419 u32 allocated_dst;
Fabio Baltieri74070482012-12-18 12:25:14 +0100420 bool use_soft_lli;
Linus Walleij8d318a52010-03-30 15:33:42 +0200421};
422
423struct d40_base;
424
425/**
426 * struct d40_chan - Struct that describes a channel.
427 *
428 * @lock: A spinlock to protect this struct.
429 * @log_num: The logical number, if any of this channel.
Linus Walleij8d318a52010-03-30 15:33:42 +0200430 * @pending_tx: The number of pending transfers. Used between interrupt handler
431 * and tasklet.
432 * @busy: Set to true when transfer is ongoing on this channel.
Jonas Aaberg2a614342010-06-20 21:25:24 +0000433 * @phy_chan: Pointer to physical channel which this instance runs on. If this
434 * point is NULL, then the channel is not allocated.
Linus Walleij8d318a52010-03-30 15:33:42 +0200435 * @chan: DMA engine handle.
436 * @tasklet: Tasklet that gets scheduled from interrupt context to complete a
437 * transfer and call client callback.
438 * @client: Cliented owned descriptor list.
Per Forlinda063d22011-08-29 13:33:32 +0200439 * @pending_queue: Submitted jobs, to be issued by issue_pending()
Linus Walleij8d318a52010-03-30 15:33:42 +0200440 * @active: Active descriptor.
Fabio Baltieri4226dd82012-12-13 13:46:16 +0100441 * @done: Completed jobs
Linus Walleij8d318a52010-03-30 15:33:42 +0200442 * @queue: Queued jobs.
Per Forlin82babbb362011-08-29 13:33:35 +0200443 * @prepare_queue: Prepared jobs.
Linus Walleij8d318a52010-03-30 15:33:42 +0200444 * @dma_cfg: The client configuration of this dma channel.
Rabin Vincentce2ca122010-10-12 13:00:49 +0000445 * @configured: whether the dma_cfg configuration is valid
Linus Walleij8d318a52010-03-30 15:33:42 +0200446 * @base: Pointer to the device instance struct.
447 * @src_def_cfg: Default cfg register setting for src.
448 * @dst_def_cfg: Default cfg register setting for dst.
449 * @log_def: Default logical channel settings.
Linus Walleij8d318a52010-03-30 15:33:42 +0200450 * @lcpa: Pointer to dst and src lcpa settings.
om prakashae752bf2011-06-27 11:33:31 +0200451 * @runtime_addr: runtime configured address.
452 * @runtime_direction: runtime configured direction.
Linus Walleij8d318a52010-03-30 15:33:42 +0200453 *
454 * This struct can either "be" a logical or a physical channel.
455 */
456struct d40_chan {
457 spinlock_t lock;
458 int log_num;
Linus Walleij8d318a52010-03-30 15:33:42 +0200459 int pending_tx;
460 bool busy;
461 struct d40_phy_res *phy_chan;
462 struct dma_chan chan;
463 struct tasklet_struct tasklet;
464 struct list_head client;
Per Forlina8f30672011-06-26 23:29:52 +0200465 struct list_head pending_queue;
Linus Walleij8d318a52010-03-30 15:33:42 +0200466 struct list_head active;
Fabio Baltieri4226dd82012-12-13 13:46:16 +0100467 struct list_head done;
Linus Walleij8d318a52010-03-30 15:33:42 +0200468 struct list_head queue;
Per Forlin82babbb362011-08-29 13:33:35 +0200469 struct list_head prepare_queue;
Linus Walleij8d318a52010-03-30 15:33:42 +0200470 struct stedma40_chan_cfg dma_cfg;
Rabin Vincentce2ca122010-10-12 13:00:49 +0000471 bool configured;
Linus Walleij8d318a52010-03-30 15:33:42 +0200472 struct d40_base *base;
473 /* Default register configurations */
474 u32 src_def_cfg;
475 u32 dst_def_cfg;
476 struct d40_def_lcsp log_def;
Linus Walleij8d318a52010-03-30 15:33:42 +0200477 struct d40_log_lli_full *lcpa;
Linus Walleij95e14002010-08-04 13:37:45 +0200478 /* Runtime reconfiguration */
479 dma_addr_t runtime_addr;
Vinod Kouldb8196d2011-10-13 22:34:23 +0530480 enum dma_transfer_direction runtime_direction;
Linus Walleij8d318a52010-03-30 15:33:42 +0200481};
482
483/**
Tong Liu3cb645d2012-09-26 10:07:30 +0000484 * struct d40_gen_dmac - generic values to represent u8500/u8540 DMA
485 * controller
486 *
487 * @backup: the pointer to the registers address array for backup
488 * @backup_size: the size of the registers address array for backup
489 * @realtime_en: the realtime enable register
490 * @realtime_clear: the realtime clear register
491 * @high_prio_en: the high priority enable register
492 * @high_prio_clear: the high priority clear register
493 * @interrupt_en: the interrupt enable register
494 * @interrupt_clear: the interrupt clear register
495 * @il: the pointer to struct d40_interrupt_lookup
496 * @il_size: the size of d40_interrupt_lookup array
497 * @init_reg: the pointer to the struct d40_reg_val
498 * @init_reg_size: the size of d40_reg_val array
499 */
500struct d40_gen_dmac {
501 u32 *backup;
502 u32 backup_size;
503 u32 realtime_en;
504 u32 realtime_clear;
505 u32 high_prio_en;
506 u32 high_prio_clear;
507 u32 interrupt_en;
508 u32 interrupt_clear;
509 struct d40_interrupt_lookup *il;
510 u32 il_size;
511 struct d40_reg_val *init_reg;
512 u32 init_reg_size;
513};
514
515/**
Linus Walleij8d318a52010-03-30 15:33:42 +0200516 * struct d40_base - The big global struct, one for each probe'd instance.
517 *
518 * @interrupt_lock: Lock used to make sure one interrupt is handle a time.
519 * @execmd_lock: Lock for execute command usage since several channels share
520 * the same physical register.
521 * @dev: The device structure.
522 * @virtbase: The virtual base address of the DMA's register.
Linus Walleijf4185592010-06-22 18:06:42 -0700523 * @rev: silicon revision detected.
Linus Walleij8d318a52010-03-30 15:33:42 +0200524 * @clk: Pointer to the DMA clock structure.
525 * @phy_start: Physical memory start of the DMA registers.
526 * @phy_size: Size of the DMA register map.
527 * @irq: The IRQ number.
Lee Jonesa7dacb62013-05-15 10:51:59 +0100528 * @num_memcpy_chans: The number of channels used for memcpy (mem-to-mem
529 * transfers).
Linus Walleij8d318a52010-03-30 15:33:42 +0200530 * @num_phy_chans: The number of physical channels. Read from HW. This
531 * is the number of available channels for this driver, not counting "Secure
532 * mode" allocated physical channels.
533 * @num_log_chans: The number of logical channels. Calculated from
534 * num_phy_chans.
535 * @dma_both: dma_device channels that can do both memcpy and slave transfers.
536 * @dma_slave: dma_device channels that can do only do slave transfers.
537 * @dma_memcpy: dma_device channels that can do only do memcpy transfers.
Narayanan G7fb3e752011-11-17 17:26:41 +0530538 * @phy_chans: Room for all possible physical channels in system.
Linus Walleij8d318a52010-03-30 15:33:42 +0200539 * @log_chans: Room for all possible logical channels in system.
540 * @lookup_log_chans: Used to map interrupt number to logical channel. Points
541 * to log_chans entries.
542 * @lookup_phy_chans: Used to map interrupt number to physical channel. Points
543 * to phy_chans entries.
544 * @plat_data: Pointer to provided platform_data which is the driver
545 * configuration.
Narayanan G28c7a192011-11-22 13:56:55 +0530546 * @lcpa_regulator: Pointer to hold the regulator for the esram bank for lcla.
Linus Walleij8d318a52010-03-30 15:33:42 +0200547 * @phy_res: Vector containing all physical channels.
548 * @lcla_pool: lcla pool settings and data.
549 * @lcpa_base: The virtual mapped address of LCPA.
550 * @phy_lcpa: The physical address of the LCPA.
551 * @lcpa_size: The size of the LCPA area.
Jonas Aabergc675b1b2010-06-20 21:25:08 +0000552 * @desc_slab: cache for descriptors.
Narayanan G7fb3e752011-11-17 17:26:41 +0530553 * @reg_val_backup: Here the values of some hardware registers are stored
554 * before the DMA is powered off. They are restored when the power is back on.
Tong Liu3cb645d2012-09-26 10:07:30 +0000555 * @reg_val_backup_v4: Backup of registers that only exits on dma40 v3 and
556 * later
Narayanan G7fb3e752011-11-17 17:26:41 +0530557 * @reg_val_backup_chan: Backup data for standard channel parameter registers.
558 * @gcc_pwr_off_mask: Mask to maintain the channels that can be turned off.
Tong Liu3cb645d2012-09-26 10:07:30 +0000559 * @gen_dmac: the struct for generic registers values to represent u8500/8540
560 * DMA controller
Linus Walleij8d318a52010-03-30 15:33:42 +0200561 */
562struct d40_base {
563 spinlock_t interrupt_lock;
564 spinlock_t execmd_lock;
565 struct device *dev;
566 void __iomem *virtbase;
Linus Walleijf4185592010-06-22 18:06:42 -0700567 u8 rev:4;
Linus Walleij8d318a52010-03-30 15:33:42 +0200568 struct clk *clk;
569 phys_addr_t phy_start;
570 resource_size_t phy_size;
571 int irq;
Lee Jonesa7dacb62013-05-15 10:51:59 +0100572 int num_memcpy_chans;
Linus Walleij8d318a52010-03-30 15:33:42 +0200573 int num_phy_chans;
574 int num_log_chans;
Per Forlinb96710e2011-10-18 18:39:47 +0200575 struct device_dma_parameters dma_parms;
Linus Walleij8d318a52010-03-30 15:33:42 +0200576 struct dma_device dma_both;
577 struct dma_device dma_slave;
578 struct dma_device dma_memcpy;
579 struct d40_chan *phy_chans;
580 struct d40_chan *log_chans;
581 struct d40_chan **lookup_log_chans;
582 struct d40_chan **lookup_phy_chans;
583 struct stedma40_platform_data *plat_data;
Narayanan G28c7a192011-11-22 13:56:55 +0530584 struct regulator *lcpa_regulator;
Linus Walleij8d318a52010-03-30 15:33:42 +0200585 /* Physical half channels */
586 struct d40_phy_res *phy_res;
587 struct d40_lcla_pool lcla_pool;
588 void *lcpa_base;
589 dma_addr_t phy_lcpa;
590 resource_size_t lcpa_size;
Jonas Aabergc675b1b2010-06-20 21:25:08 +0000591 struct kmem_cache *desc_slab;
Narayanan G7fb3e752011-11-17 17:26:41 +0530592 u32 reg_val_backup[BACKUP_REGS_SZ];
Lee Jones84b3da12013-05-03 15:31:58 +0100593 u32 reg_val_backup_v4[BACKUP_REGS_SZ_MAX];
Narayanan G7fb3e752011-11-17 17:26:41 +0530594 u32 *reg_val_backup_chan;
595 u16 gcc_pwr_off_mask;
Tong Liu3cb645d2012-09-26 10:07:30 +0000596 struct d40_gen_dmac gen_dmac;
Linus Walleij8d318a52010-03-30 15:33:42 +0200597};
598
Rabin Vincent262d2912011-01-25 11:18:05 +0100599static struct device *chan2dev(struct d40_chan *d40c)
600{
601 return &d40c->chan.dev->device;
602}
603
Rabin Vincent724a8572011-01-25 11:18:08 +0100604static bool chan_is_physical(struct d40_chan *chan)
605{
606 return chan->log_num == D40_PHY_CHAN;
607}
608
609static bool chan_is_logical(struct d40_chan *chan)
610{
611 return !chan_is_physical(chan);
612}
613
Rabin Vincent8ca84682011-01-25 11:18:07 +0100614static void __iomem *chan_base(struct d40_chan *chan)
615{
616 return chan->base->virtbase + D40_DREG_PCBASE +
617 chan->phy_chan->num * D40_DREG_PCDELTA;
618}
619
Rabin Vincent6db5a8b2011-01-25 11:18:09 +0100620#define d40_err(dev, format, arg...) \
621 dev_err(dev, "[%s] " format, __func__, ## arg)
622
623#define chan_err(d40c, format, arg...) \
624 d40_err(chan2dev(d40c), format, ## arg)
625
Rabin Vincentb00f9382011-01-25 11:18:15 +0100626static int d40_pool_lli_alloc(struct d40_chan *d40c, struct d40_desc *d40d,
Rabin Vincentdbd88782011-01-25 11:18:19 +0100627 int lli_len)
Linus Walleij8d318a52010-03-30 15:33:42 +0200628{
Rabin Vincentdbd88782011-01-25 11:18:19 +0100629 bool is_log = chan_is_logical(d40c);
Linus Walleij8d318a52010-03-30 15:33:42 +0200630 u32 align;
631 void *base;
632
633 if (is_log)
634 align = sizeof(struct d40_log_lli);
635 else
636 align = sizeof(struct d40_phy_lli);
637
638 if (lli_len == 1) {
639 base = d40d->lli_pool.pre_alloc_lli;
640 d40d->lli_pool.size = sizeof(d40d->lli_pool.pre_alloc_lli);
641 d40d->lli_pool.base = NULL;
642 } else {
Rabin Vincent594ece42011-01-25 11:18:12 +0100643 d40d->lli_pool.size = lli_len * 2 * align;
Linus Walleij8d318a52010-03-30 15:33:42 +0200644
645 base = kmalloc(d40d->lli_pool.size + align, GFP_NOWAIT);
646 d40d->lli_pool.base = base;
647
648 if (d40d->lli_pool.base == NULL)
649 return -ENOMEM;
650 }
651
652 if (is_log) {
Rabin Vincentd924aba2011-01-25 11:18:16 +0100653 d40d->lli_log.src = PTR_ALIGN(base, align);
Rabin Vincent594ece42011-01-25 11:18:12 +0100654 d40d->lli_log.dst = d40d->lli_log.src + lli_len;
Rabin Vincentb00f9382011-01-25 11:18:15 +0100655
656 d40d->lli_pool.dma_addr = 0;
Linus Walleij8d318a52010-03-30 15:33:42 +0200657 } else {
Rabin Vincentd924aba2011-01-25 11:18:16 +0100658 d40d->lli_phy.src = PTR_ALIGN(base, align);
Rabin Vincent594ece42011-01-25 11:18:12 +0100659 d40d->lli_phy.dst = d40d->lli_phy.src + lli_len;
Rabin Vincentb00f9382011-01-25 11:18:15 +0100660
661 d40d->lli_pool.dma_addr = dma_map_single(d40c->base->dev,
662 d40d->lli_phy.src,
663 d40d->lli_pool.size,
664 DMA_TO_DEVICE);
665
666 if (dma_mapping_error(d40c->base->dev,
667 d40d->lli_pool.dma_addr)) {
668 kfree(d40d->lli_pool.base);
669 d40d->lli_pool.base = NULL;
670 d40d->lli_pool.dma_addr = 0;
671 return -ENOMEM;
672 }
Linus Walleij8d318a52010-03-30 15:33:42 +0200673 }
674
675 return 0;
676}
677
Rabin Vincentb00f9382011-01-25 11:18:15 +0100678static void d40_pool_lli_free(struct d40_chan *d40c, struct d40_desc *d40d)
Linus Walleij8d318a52010-03-30 15:33:42 +0200679{
Rabin Vincentb00f9382011-01-25 11:18:15 +0100680 if (d40d->lli_pool.dma_addr)
681 dma_unmap_single(d40c->base->dev, d40d->lli_pool.dma_addr,
682 d40d->lli_pool.size, DMA_TO_DEVICE);
683
Linus Walleij8d318a52010-03-30 15:33:42 +0200684 kfree(d40d->lli_pool.base);
685 d40d->lli_pool.base = NULL;
686 d40d->lli_pool.size = 0;
687 d40d->lli_log.src = NULL;
688 d40d->lli_log.dst = NULL;
689 d40d->lli_phy.src = NULL;
690 d40d->lli_phy.dst = NULL;
Linus Walleij8d318a52010-03-30 15:33:42 +0200691}
692
Jonas Aaberg698e4732010-08-09 12:08:56 +0000693static int d40_lcla_alloc_one(struct d40_chan *d40c,
694 struct d40_desc *d40d)
695{
696 unsigned long flags;
697 int i;
698 int ret = -EINVAL;
Jonas Aaberg698e4732010-08-09 12:08:56 +0000699
700 spin_lock_irqsave(&d40c->base->lcla_pool.lock, flags);
701
Jonas Aaberg698e4732010-08-09 12:08:56 +0000702 /*
703 * Allocate both src and dst at the same time, therefore the half
704 * start on 1 since 0 can't be used since zero is used as end marker.
705 */
706 for (i = 1 ; i < D40_LCLA_LINK_PER_EVENT_GRP / 2; i++) {
Fabio Baltieri7ce529e2012-12-18 16:59:09 +0100707 int idx = d40c->phy_chan->num * D40_LCLA_LINK_PER_EVENT_GRP + i;
708
709 if (!d40c->base->lcla_pool.alloc_map[idx]) {
710 d40c->base->lcla_pool.alloc_map[idx] = d40d;
Jonas Aaberg698e4732010-08-09 12:08:56 +0000711 d40d->lcla_alloc++;
712 ret = i;
713 break;
714 }
715 }
716
717 spin_unlock_irqrestore(&d40c->base->lcla_pool.lock, flags);
718
719 return ret;
720}
721
722static int d40_lcla_free_all(struct d40_chan *d40c,
723 struct d40_desc *d40d)
724{
725 unsigned long flags;
726 int i;
727 int ret = -EINVAL;
728
Rabin Vincent724a8572011-01-25 11:18:08 +0100729 if (chan_is_physical(d40c))
Jonas Aaberg698e4732010-08-09 12:08:56 +0000730 return 0;
731
732 spin_lock_irqsave(&d40c->base->lcla_pool.lock, flags);
733
734 for (i = 1 ; i < D40_LCLA_LINK_PER_EVENT_GRP / 2; i++) {
Fabio Baltieri7ce529e2012-12-18 16:59:09 +0100735 int idx = d40c->phy_chan->num * D40_LCLA_LINK_PER_EVENT_GRP + i;
736
737 if (d40c->base->lcla_pool.alloc_map[idx] == d40d) {
738 d40c->base->lcla_pool.alloc_map[idx] = NULL;
Jonas Aaberg698e4732010-08-09 12:08:56 +0000739 d40d->lcla_alloc--;
740 if (d40d->lcla_alloc == 0) {
741 ret = 0;
742 break;
743 }
744 }
745 }
746
747 spin_unlock_irqrestore(&d40c->base->lcla_pool.lock, flags);
748
749 return ret;
750
751}
752
Linus Walleij8d318a52010-03-30 15:33:42 +0200753static void d40_desc_remove(struct d40_desc *d40d)
754{
755 list_del(&d40d->node);
756}
757
758static struct d40_desc *d40_desc_get(struct d40_chan *d40c)
759{
Rabin Vincenta2c15fa2010-10-06 08:20:37 +0000760 struct d40_desc *desc = NULL;
Linus Walleij8d318a52010-03-30 15:33:42 +0200761
762 if (!list_empty(&d40c->client)) {
Rabin Vincenta2c15fa2010-10-06 08:20:37 +0000763 struct d40_desc *d;
764 struct d40_desc *_d;
765
Narayanan G7fb3e752011-11-17 17:26:41 +0530766 list_for_each_entry_safe(d, _d, &d40c->client, node) {
Linus Walleij8d318a52010-03-30 15:33:42 +0200767 if (async_tx_test_ack(&d->txd)) {
Linus Walleij8d318a52010-03-30 15:33:42 +0200768 d40_desc_remove(d);
Rabin Vincenta2c15fa2010-10-06 08:20:37 +0000769 desc = d;
770 memset(desc, 0, sizeof(*desc));
Jonas Aabergc675b1b2010-06-20 21:25:08 +0000771 break;
Linus Walleij8d318a52010-03-30 15:33:42 +0200772 }
Narayanan G7fb3e752011-11-17 17:26:41 +0530773 }
Linus Walleij8d318a52010-03-30 15:33:42 +0200774 }
Rabin Vincenta2c15fa2010-10-06 08:20:37 +0000775
776 if (!desc)
777 desc = kmem_cache_zalloc(d40c->base->desc_slab, GFP_NOWAIT);
778
779 if (desc)
780 INIT_LIST_HEAD(&desc->node);
781
782 return desc;
Linus Walleij8d318a52010-03-30 15:33:42 +0200783}
784
785static void d40_desc_free(struct d40_chan *d40c, struct d40_desc *d40d)
786{
Jonas Aaberg698e4732010-08-09 12:08:56 +0000787
Rabin Vincentb00f9382011-01-25 11:18:15 +0100788 d40_pool_lli_free(d40c, d40d);
Jonas Aaberg698e4732010-08-09 12:08:56 +0000789 d40_lcla_free_all(d40c, d40d);
Jonas Aabergc675b1b2010-06-20 21:25:08 +0000790 kmem_cache_free(d40c->base->desc_slab, d40d);
Linus Walleij8d318a52010-03-30 15:33:42 +0200791}
792
793static void d40_desc_submit(struct d40_chan *d40c, struct d40_desc *desc)
794{
795 list_add_tail(&desc->node, &d40c->active);
796}
797
Rabin Vincent1c4b0922011-01-25 11:18:24 +0100798static void d40_phy_lli_load(struct d40_chan *chan, struct d40_desc *desc)
799{
800 struct d40_phy_lli *lli_dst = desc->lli_phy.dst;
801 struct d40_phy_lli *lli_src = desc->lli_phy.src;
802 void __iomem *base = chan_base(chan);
803
804 writel(lli_src->reg_cfg, base + D40_CHAN_REG_SSCFG);
805 writel(lli_src->reg_elt, base + D40_CHAN_REG_SSELT);
806 writel(lli_src->reg_ptr, base + D40_CHAN_REG_SSPTR);
807 writel(lli_src->reg_lnk, base + D40_CHAN_REG_SSLNK);
808
809 writel(lli_dst->reg_cfg, base + D40_CHAN_REG_SDCFG);
810 writel(lli_dst->reg_elt, base + D40_CHAN_REG_SDELT);
811 writel(lli_dst->reg_ptr, base + D40_CHAN_REG_SDPTR);
812 writel(lli_dst->reg_lnk, base + D40_CHAN_REG_SDLNK);
813}
814
Fabio Baltieri4226dd82012-12-13 13:46:16 +0100815static void d40_desc_done(struct d40_chan *d40c, struct d40_desc *desc)
816{
817 list_add_tail(&desc->node, &d40c->done);
818}
819
Rabin Vincente65889c2011-01-25 11:18:31 +0100820static void d40_log_lli_to_lcxa(struct d40_chan *chan, struct d40_desc *desc)
821{
822 struct d40_lcla_pool *pool = &chan->base->lcla_pool;
823 struct d40_log_lli_bidir *lli = &desc->lli_log;
824 int lli_current = desc->lli_current;
825 int lli_len = desc->lli_len;
Rabin Vincent0c842b52011-01-25 11:18:35 +0100826 bool cyclic = desc->cyclic;
Rabin Vincente65889c2011-01-25 11:18:31 +0100827 int curr_lcla = -EINVAL;
Rabin Vincent0c842b52011-01-25 11:18:35 +0100828 int first_lcla = 0;
Narayanan G28c7a192011-11-22 13:56:55 +0530829 bool use_esram_lcla = chan->base->plat_data->use_esram_lcla;
Rabin Vincent0c842b52011-01-25 11:18:35 +0100830 bool linkback;
Rabin Vincente65889c2011-01-25 11:18:31 +0100831
Rabin Vincent0c842b52011-01-25 11:18:35 +0100832 /*
833 * We may have partially running cyclic transfers, in case we did't get
834 * enough LCLA entries.
835 */
836 linkback = cyclic && lli_current == 0;
837
838 /*
839 * For linkback, we need one LCLA even with only one link, because we
840 * can't link back to the one in LCPA space
841 */
842 if (linkback || (lli_len - lli_current > 1)) {
Fabio Baltieri74070482012-12-18 12:25:14 +0100843 /*
844 * If the channel is expected to use only soft_lli don't
845 * allocate a lcla. This is to avoid a HW issue that exists
846 * in some controller during a peripheral to memory transfer
847 * that uses linked lists.
848 */
849 if (!(chan->phy_chan->use_soft_lli &&
Lee Jones2c2b62d2013-05-15 10:51:54 +0100850 chan->dma_cfg.dir == DMA_DEV_TO_MEM))
Fabio Baltieri74070482012-12-18 12:25:14 +0100851 curr_lcla = d40_lcla_alloc_one(chan, desc);
852
Rabin Vincent0c842b52011-01-25 11:18:35 +0100853 first_lcla = curr_lcla;
854 }
Rabin Vincente65889c2011-01-25 11:18:31 +0100855
Rabin Vincent0c842b52011-01-25 11:18:35 +0100856 /*
857 * For linkback, we normally load the LCPA in the loop since we need to
858 * link it to the second LCLA and not the first. However, if we
859 * couldn't even get a first LCLA, then we have to run in LCPA and
860 * reload manually.
861 */
862 if (!linkback || curr_lcla == -EINVAL) {
863 unsigned int flags = 0;
Rabin Vincente65889c2011-01-25 11:18:31 +0100864
Rabin Vincent0c842b52011-01-25 11:18:35 +0100865 if (curr_lcla == -EINVAL)
866 flags |= LLI_TERM_INT;
867
868 d40_log_lli_lcpa_write(chan->lcpa,
869 &lli->dst[lli_current],
870 &lli->src[lli_current],
871 curr_lcla,
872 flags);
873 lli_current++;
874 }
Rabin Vincent6045f0b2011-01-25 11:18:32 +0100875
876 if (curr_lcla < 0)
877 goto out;
878
Rabin Vincente65889c2011-01-25 11:18:31 +0100879 for (; lli_current < lli_len; lli_current++) {
880 unsigned int lcla_offset = chan->phy_chan->num * 1024 +
881 8 * curr_lcla * 2;
882 struct d40_log_lli *lcla = pool->base + lcla_offset;
Rabin Vincent0c842b52011-01-25 11:18:35 +0100883 unsigned int flags = 0;
Rabin Vincente65889c2011-01-25 11:18:31 +0100884 int next_lcla;
885
886 if (lli_current + 1 < lli_len)
887 next_lcla = d40_lcla_alloc_one(chan, desc);
888 else
Rabin Vincent0c842b52011-01-25 11:18:35 +0100889 next_lcla = linkback ? first_lcla : -EINVAL;
Rabin Vincente65889c2011-01-25 11:18:31 +0100890
Rabin Vincent0c842b52011-01-25 11:18:35 +0100891 if (cyclic || next_lcla == -EINVAL)
892 flags |= LLI_TERM_INT;
893
894 if (linkback && curr_lcla == first_lcla) {
895 /* First link goes in both LCPA and LCLA */
896 d40_log_lli_lcpa_write(chan->lcpa,
897 &lli->dst[lli_current],
898 &lli->src[lli_current],
899 next_lcla, flags);
900 }
901
902 /*
903 * One unused LCLA in the cyclic case if the very first
904 * next_lcla fails...
905 */
Rabin Vincente65889c2011-01-25 11:18:31 +0100906 d40_log_lli_lcla_write(lcla,
907 &lli->dst[lli_current],
908 &lli->src[lli_current],
Rabin Vincent0c842b52011-01-25 11:18:35 +0100909 next_lcla, flags);
Rabin Vincente65889c2011-01-25 11:18:31 +0100910
Narayanan G28c7a192011-11-22 13:56:55 +0530911 /*
912 * Cache maintenance is not needed if lcla is
913 * mapped in esram
914 */
915 if (!use_esram_lcla) {
916 dma_sync_single_range_for_device(chan->base->dev,
917 pool->dma_addr, lcla_offset,
918 2 * sizeof(struct d40_log_lli),
919 DMA_TO_DEVICE);
920 }
Rabin Vincente65889c2011-01-25 11:18:31 +0100921 curr_lcla = next_lcla;
922
Rabin Vincent0c842b52011-01-25 11:18:35 +0100923 if (curr_lcla == -EINVAL || curr_lcla == first_lcla) {
Rabin Vincente65889c2011-01-25 11:18:31 +0100924 lli_current++;
925 break;
926 }
927 }
928
Rabin Vincent6045f0b2011-01-25 11:18:32 +0100929out:
Rabin Vincente65889c2011-01-25 11:18:31 +0100930 desc->lli_current = lli_current;
931}
932
Jonas Aaberg698e4732010-08-09 12:08:56 +0000933static void d40_desc_load(struct d40_chan *d40c, struct d40_desc *d40d)
934{
Rabin Vincent724a8572011-01-25 11:18:08 +0100935 if (chan_is_physical(d40c)) {
Rabin Vincent1c4b0922011-01-25 11:18:24 +0100936 d40_phy_lli_load(d40c, d40d);
Jonas Aaberg698e4732010-08-09 12:08:56 +0000937 d40d->lli_current = d40d->lli_len;
Rabin Vincente65889c2011-01-25 11:18:31 +0100938 } else
939 d40_log_lli_to_lcxa(d40c, d40d);
Jonas Aaberg698e4732010-08-09 12:08:56 +0000940}
941
Linus Walleij8d318a52010-03-30 15:33:42 +0200942static struct d40_desc *d40_first_active_get(struct d40_chan *d40c)
943{
944 struct d40_desc *d;
945
946 if (list_empty(&d40c->active))
947 return NULL;
948
949 d = list_first_entry(&d40c->active,
950 struct d40_desc,
951 node);
952 return d;
953}
954
Per Forlin74043682011-08-29 13:33:34 +0200955/* remove desc from current queue and add it to the pending_queue */
Linus Walleij8d318a52010-03-30 15:33:42 +0200956static void d40_desc_queue(struct d40_chan *d40c, struct d40_desc *desc)
957{
Per Forlin74043682011-08-29 13:33:34 +0200958 d40_desc_remove(desc);
959 desc->is_in_client_list = false;
Per Forlina8f30672011-06-26 23:29:52 +0200960 list_add_tail(&desc->node, &d40c->pending_queue);
961}
962
963static struct d40_desc *d40_first_pending(struct d40_chan *d40c)
964{
965 struct d40_desc *d;
966
967 if (list_empty(&d40c->pending_queue))
968 return NULL;
969
970 d = list_first_entry(&d40c->pending_queue,
971 struct d40_desc,
972 node);
973 return d;
Linus Walleij8d318a52010-03-30 15:33:42 +0200974}
975
976static struct d40_desc *d40_first_queued(struct d40_chan *d40c)
977{
978 struct d40_desc *d;
979
980 if (list_empty(&d40c->queue))
981 return NULL;
982
983 d = list_first_entry(&d40c->queue,
984 struct d40_desc,
985 node);
986 return d;
987}
988
Fabio Baltieri4226dd82012-12-13 13:46:16 +0100989static struct d40_desc *d40_first_done(struct d40_chan *d40c)
990{
991 if (list_empty(&d40c->done))
992 return NULL;
993
994 return list_first_entry(&d40c->done, struct d40_desc, node);
995}
996
Per Forlind49278e2010-12-20 18:31:38 +0100997static int d40_psize_2_burst_size(bool is_log, int psize)
998{
999 if (is_log) {
1000 if (psize == STEDMA40_PSIZE_LOG_1)
1001 return 1;
1002 } else {
1003 if (psize == STEDMA40_PSIZE_PHY_1)
1004 return 1;
1005 }
Linus Walleij8d318a52010-03-30 15:33:42 +02001006
Per Forlind49278e2010-12-20 18:31:38 +01001007 return 2 << psize;
1008}
1009
1010/*
1011 * The dma only supports transmitting packages up to
Lee Jones43f2e1a2013-05-15 11:51:57 +02001012 * STEDMA40_MAX_SEG_SIZE * data_width, where data_width is stored in Bytes.
1013 *
1014 * Calculate the total number of dma elements required to send the entire sg list.
Per Forlind49278e2010-12-20 18:31:38 +01001015 */
1016static int d40_size_2_dmalen(int size, u32 data_width1, u32 data_width2)
1017{
1018 int dmalen;
1019 u32 max_w = max(data_width1, data_width2);
1020 u32 min_w = min(data_width1, data_width2);
Lee Jones43f2e1a2013-05-15 11:51:57 +02001021 u32 seg_max = ALIGN(STEDMA40_MAX_SEG_SIZE * min_w, max_w);
Per Forlind49278e2010-12-20 18:31:38 +01001022
1023 if (seg_max > STEDMA40_MAX_SEG_SIZE)
Lee Jones43f2e1a2013-05-15 11:51:57 +02001024 seg_max -= max_w;
Per Forlind49278e2010-12-20 18:31:38 +01001025
Lee Jones43f2e1a2013-05-15 11:51:57 +02001026 if (!IS_ALIGNED(size, max_w))
Per Forlind49278e2010-12-20 18:31:38 +01001027 return -EINVAL;
1028
1029 if (size <= seg_max)
1030 dmalen = 1;
1031 else {
1032 dmalen = size / seg_max;
1033 if (dmalen * seg_max < size)
1034 dmalen++;
1035 }
1036 return dmalen;
1037}
1038
1039static int d40_sg_2_dmalen(struct scatterlist *sgl, int sg_len,
1040 u32 data_width1, u32 data_width2)
1041{
1042 struct scatterlist *sg;
1043 int i;
1044 int len = 0;
1045 int ret;
1046
1047 for_each_sg(sgl, sg, sg_len, i) {
1048 ret = d40_size_2_dmalen(sg_dma_len(sg),
1049 data_width1, data_width2);
1050 if (ret < 0)
1051 return ret;
1052 len += ret;
1053 }
1054 return len;
1055}
1056
Narayanan G1bdae6f2012-02-09 12:41:37 +05301057static int __d40_execute_command_phy(struct d40_chan *d40c,
1058 enum d40_command command)
Linus Walleij8d318a52010-03-30 15:33:42 +02001059{
Jonas Aaberg767a9672010-08-09 12:08:34 +00001060 u32 status;
1061 int i;
Linus Walleij8d318a52010-03-30 15:33:42 +02001062 void __iomem *active_reg;
1063 int ret = 0;
1064 unsigned long flags;
Jonas Aaberg1d392a72010-06-20 21:26:01 +00001065 u32 wmask;
Linus Walleij8d318a52010-03-30 15:33:42 +02001066
Narayanan G1bdae6f2012-02-09 12:41:37 +05301067 if (command == D40_DMA_STOP) {
1068 ret = __d40_execute_command_phy(d40c, D40_DMA_SUSPEND_REQ);
1069 if (ret)
1070 return ret;
1071 }
1072
Linus Walleij8d318a52010-03-30 15:33:42 +02001073 spin_lock_irqsave(&d40c->base->execmd_lock, flags);
1074
1075 if (d40c->phy_chan->num % 2 == 0)
1076 active_reg = d40c->base->virtbase + D40_DREG_ACTIVE;
1077 else
1078 active_reg = d40c->base->virtbase + D40_DREG_ACTIVO;
1079
1080 if (command == D40_DMA_SUSPEND_REQ) {
1081 status = (readl(active_reg) &
1082 D40_CHAN_POS_MASK(d40c->phy_chan->num)) >>
1083 D40_CHAN_POS(d40c->phy_chan->num);
1084
1085 if (status == D40_DMA_SUSPENDED || status == D40_DMA_STOP)
1086 goto done;
1087 }
1088
Jonas Aaberg1d392a72010-06-20 21:26:01 +00001089 wmask = 0xffffffff & ~(D40_CHAN_POS_MASK(d40c->phy_chan->num));
1090 writel(wmask | (command << D40_CHAN_POS(d40c->phy_chan->num)),
1091 active_reg);
Linus Walleij8d318a52010-03-30 15:33:42 +02001092
1093 if (command == D40_DMA_SUSPEND_REQ) {
1094
1095 for (i = 0 ; i < D40_SUSPEND_MAX_IT; i++) {
1096 status = (readl(active_reg) &
1097 D40_CHAN_POS_MASK(d40c->phy_chan->num)) >>
1098 D40_CHAN_POS(d40c->phy_chan->num);
1099
1100 cpu_relax();
1101 /*
1102 * Reduce the number of bus accesses while
1103 * waiting for the DMA to suspend.
1104 */
1105 udelay(3);
1106
1107 if (status == D40_DMA_STOP ||
1108 status == D40_DMA_SUSPENDED)
1109 break;
1110 }
1111
1112 if (i == D40_SUSPEND_MAX_IT) {
Rabin Vincent6db5a8b2011-01-25 11:18:09 +01001113 chan_err(d40c,
1114 "unable to suspend the chl %d (log: %d) status %x\n",
1115 d40c->phy_chan->num, d40c->log_num,
Linus Walleij8d318a52010-03-30 15:33:42 +02001116 status);
1117 dump_stack();
1118 ret = -EBUSY;
1119 }
1120
1121 }
1122done:
1123 spin_unlock_irqrestore(&d40c->base->execmd_lock, flags);
1124 return ret;
1125}
1126
1127static void d40_term_all(struct d40_chan *d40c)
1128{
1129 struct d40_desc *d40d;
Per Forlin74043682011-08-29 13:33:34 +02001130 struct d40_desc *_d;
Linus Walleij8d318a52010-03-30 15:33:42 +02001131
Fabio Baltieri4226dd82012-12-13 13:46:16 +01001132 /* Release completed descriptors */
1133 while ((d40d = d40_first_done(d40c))) {
1134 d40_desc_remove(d40d);
1135 d40_desc_free(d40c, d40d);
1136 }
1137
Linus Walleij8d318a52010-03-30 15:33:42 +02001138 /* Release active descriptors */
1139 while ((d40d = d40_first_active_get(d40c))) {
1140 d40_desc_remove(d40d);
Linus Walleij8d318a52010-03-30 15:33:42 +02001141 d40_desc_free(d40c, d40d);
1142 }
1143
1144 /* Release queued descriptors waiting for transfer */
1145 while ((d40d = d40_first_queued(d40c))) {
1146 d40_desc_remove(d40d);
Linus Walleij8d318a52010-03-30 15:33:42 +02001147 d40_desc_free(d40c, d40d);
1148 }
1149
Per Forlina8f30672011-06-26 23:29:52 +02001150 /* Release pending descriptors */
1151 while ((d40d = d40_first_pending(d40c))) {
1152 d40_desc_remove(d40d);
1153 d40_desc_free(d40c, d40d);
1154 }
Linus Walleij8d318a52010-03-30 15:33:42 +02001155
Per Forlin74043682011-08-29 13:33:34 +02001156 /* Release client owned descriptors */
1157 if (!list_empty(&d40c->client))
1158 list_for_each_entry_safe(d40d, _d, &d40c->client, node) {
1159 d40_desc_remove(d40d);
1160 d40_desc_free(d40c, d40d);
1161 }
1162
Per Forlin82babbb362011-08-29 13:33:35 +02001163 /* Release descriptors in prepare queue */
1164 if (!list_empty(&d40c->prepare_queue))
1165 list_for_each_entry_safe(d40d, _d,
1166 &d40c->prepare_queue, node) {
1167 d40_desc_remove(d40d);
1168 d40_desc_free(d40c, d40d);
1169 }
Per Forlin74043682011-08-29 13:33:34 +02001170
Linus Walleij8d318a52010-03-30 15:33:42 +02001171 d40c->pending_tx = 0;
Linus Walleij8d318a52010-03-30 15:33:42 +02001172}
1173
Narayanan G1bdae6f2012-02-09 12:41:37 +05301174static void __d40_config_set_event(struct d40_chan *d40c,
1175 enum d40_events event_type, u32 event,
1176 int reg)
Rabin Vincent262d2912011-01-25 11:18:05 +01001177{
Rabin Vincent8ca84682011-01-25 11:18:07 +01001178 void __iomem *addr = chan_base(d40c) + reg;
Rabin Vincent262d2912011-01-25 11:18:05 +01001179 int tries;
Narayanan G1bdae6f2012-02-09 12:41:37 +05301180 u32 status;
Rabin Vincent262d2912011-01-25 11:18:05 +01001181
Narayanan G1bdae6f2012-02-09 12:41:37 +05301182 switch (event_type) {
1183
1184 case D40_DEACTIVATE_EVENTLINE:
1185
Rabin Vincent262d2912011-01-25 11:18:05 +01001186 writel((D40_DEACTIVATE_EVENTLINE << D40_EVENTLINE_POS(event))
1187 | ~D40_EVENTLINE_MASK(event), addr);
Narayanan G1bdae6f2012-02-09 12:41:37 +05301188 break;
Rabin Vincent262d2912011-01-25 11:18:05 +01001189
Narayanan G1bdae6f2012-02-09 12:41:37 +05301190 case D40_SUSPEND_REQ_EVENTLINE:
1191 status = (readl(addr) & D40_EVENTLINE_MASK(event)) >>
1192 D40_EVENTLINE_POS(event);
1193
1194 if (status == D40_DEACTIVATE_EVENTLINE ||
1195 status == D40_SUSPEND_REQ_EVENTLINE)
1196 break;
1197
1198 writel((D40_SUSPEND_REQ_EVENTLINE << D40_EVENTLINE_POS(event))
1199 | ~D40_EVENTLINE_MASK(event), addr);
1200
1201 for (tries = 0 ; tries < D40_SUSPEND_MAX_IT; tries++) {
1202
1203 status = (readl(addr) & D40_EVENTLINE_MASK(event)) >>
1204 D40_EVENTLINE_POS(event);
1205
1206 cpu_relax();
1207 /*
1208 * Reduce the number of bus accesses while
1209 * waiting for the DMA to suspend.
1210 */
1211 udelay(3);
1212
1213 if (status == D40_DEACTIVATE_EVENTLINE)
1214 break;
1215 }
1216
1217 if (tries == D40_SUSPEND_MAX_IT) {
1218 chan_err(d40c,
1219 "unable to stop the event_line chl %d (log: %d)"
1220 "status %x\n", d40c->phy_chan->num,
1221 d40c->log_num, status);
1222 }
1223 break;
1224
1225 case D40_ACTIVATE_EVENTLINE:
Rabin Vincent262d2912011-01-25 11:18:05 +01001226 /*
1227 * The hardware sometimes doesn't register the enable when src and dst
1228 * event lines are active on the same logical channel. Retry to ensure
1229 * it does. Usually only one retry is sufficient.
1230 */
Narayanan G1bdae6f2012-02-09 12:41:37 +05301231 tries = 100;
1232 while (--tries) {
1233 writel((D40_ACTIVATE_EVENTLINE <<
1234 D40_EVENTLINE_POS(event)) |
1235 ~D40_EVENTLINE_MASK(event), addr);
Rabin Vincent262d2912011-01-25 11:18:05 +01001236
Narayanan G1bdae6f2012-02-09 12:41:37 +05301237 if (readl(addr) & D40_EVENTLINE_MASK(event))
1238 break;
1239 }
1240
1241 if (tries != 99)
1242 dev_dbg(chan2dev(d40c),
1243 "[%s] workaround enable S%cLNK (%d tries)\n",
1244 __func__, reg == D40_CHAN_REG_SSLNK ? 'S' : 'D',
1245 100 - tries);
1246
1247 WARN_ON(!tries);
1248 break;
1249
1250 case D40_ROUND_EVENTLINE:
1251 BUG();
1252 break;
1253
Rabin Vincent262d2912011-01-25 11:18:05 +01001254 }
Rabin Vincent262d2912011-01-25 11:18:05 +01001255}
1256
Narayanan G1bdae6f2012-02-09 12:41:37 +05301257static void d40_config_set_event(struct d40_chan *d40c,
1258 enum d40_events event_type)
Linus Walleij8d318a52010-03-30 15:33:42 +02001259{
Lee Jones26955c07d2013-05-03 15:31:56 +01001260 u32 event = D40_TYPE_TO_EVENT(d40c->dma_cfg.dev_type);
1261
Linus Walleij8d318a52010-03-30 15:33:42 +02001262 /* Enable event line connected to device (or memcpy) */
Lee Jones2c2b62d2013-05-15 10:51:54 +01001263 if ((d40c->dma_cfg.dir == DMA_DEV_TO_MEM) ||
1264 (d40c->dma_cfg.dir == DMA_DEV_TO_DEV))
Narayanan G1bdae6f2012-02-09 12:41:37 +05301265 __d40_config_set_event(d40c, event_type, event,
Rabin Vincent262d2912011-01-25 11:18:05 +01001266 D40_CHAN_REG_SSLNK);
Rabin Vincent262d2912011-01-25 11:18:05 +01001267
Lee Jones2c2b62d2013-05-15 10:51:54 +01001268 if (d40c->dma_cfg.dir != DMA_DEV_TO_MEM)
Narayanan G1bdae6f2012-02-09 12:41:37 +05301269 __d40_config_set_event(d40c, event_type, event,
Rabin Vincent262d2912011-01-25 11:18:05 +01001270 D40_CHAN_REG_SDLNK);
Linus Walleij8d318a52010-03-30 15:33:42 +02001271}
1272
Jonas Aaberga5ebca42010-05-18 00:41:09 +02001273static u32 d40_chan_has_events(struct d40_chan *d40c)
Linus Walleij8d318a52010-03-30 15:33:42 +02001274{
Rabin Vincent8ca84682011-01-25 11:18:07 +01001275 void __iomem *chanbase = chan_base(d40c);
Jonas Aabergbe8cb7d2010-08-09 12:07:44 +00001276 u32 val;
Linus Walleij8d318a52010-03-30 15:33:42 +02001277
Rabin Vincent8ca84682011-01-25 11:18:07 +01001278 val = readl(chanbase + D40_CHAN_REG_SSLNK);
1279 val |= readl(chanbase + D40_CHAN_REG_SDLNK);
Linus Walleij8d318a52010-03-30 15:33:42 +02001280
Jonas Aaberga5ebca42010-05-18 00:41:09 +02001281 return val;
Linus Walleij8d318a52010-03-30 15:33:42 +02001282}
1283
Narayanan G1bdae6f2012-02-09 12:41:37 +05301284static int
1285__d40_execute_command_log(struct d40_chan *d40c, enum d40_command command)
1286{
1287 unsigned long flags;
1288 int ret = 0;
1289 u32 active_status;
1290 void __iomem *active_reg;
1291
1292 if (d40c->phy_chan->num % 2 == 0)
1293 active_reg = d40c->base->virtbase + D40_DREG_ACTIVE;
1294 else
1295 active_reg = d40c->base->virtbase + D40_DREG_ACTIVO;
1296
1297
1298 spin_lock_irqsave(&d40c->phy_chan->lock, flags);
1299
1300 switch (command) {
1301 case D40_DMA_STOP:
1302 case D40_DMA_SUSPEND_REQ:
1303
1304 active_status = (readl(active_reg) &
1305 D40_CHAN_POS_MASK(d40c->phy_chan->num)) >>
1306 D40_CHAN_POS(d40c->phy_chan->num);
1307
1308 if (active_status == D40_DMA_RUN)
1309 d40_config_set_event(d40c, D40_SUSPEND_REQ_EVENTLINE);
1310 else
1311 d40_config_set_event(d40c, D40_DEACTIVATE_EVENTLINE);
1312
1313 if (!d40_chan_has_events(d40c) && (command == D40_DMA_STOP))
1314 ret = __d40_execute_command_phy(d40c, command);
1315
1316 break;
1317
1318 case D40_DMA_RUN:
1319
1320 d40_config_set_event(d40c, D40_ACTIVATE_EVENTLINE);
1321 ret = __d40_execute_command_phy(d40c, command);
1322 break;
1323
1324 case D40_DMA_SUSPENDED:
1325 BUG();
1326 break;
1327 }
1328
1329 spin_unlock_irqrestore(&d40c->phy_chan->lock, flags);
1330 return ret;
1331}
1332
1333static int d40_channel_execute_command(struct d40_chan *d40c,
1334 enum d40_command command)
1335{
1336 if (chan_is_logical(d40c))
1337 return __d40_execute_command_log(d40c, command);
1338 else
1339 return __d40_execute_command_phy(d40c, command);
1340}
1341
Rabin Vincent20a5b6d2010-10-12 13:00:52 +00001342static u32 d40_get_prmo(struct d40_chan *d40c)
1343{
1344 static const unsigned int phy_map[] = {
1345 [STEDMA40_PCHAN_BASIC_MODE]
1346 = D40_DREG_PRMO_PCHAN_BASIC,
1347 [STEDMA40_PCHAN_MODULO_MODE]
1348 = D40_DREG_PRMO_PCHAN_MODULO,
1349 [STEDMA40_PCHAN_DOUBLE_DST_MODE]
1350 = D40_DREG_PRMO_PCHAN_DOUBLE_DST,
1351 };
1352 static const unsigned int log_map[] = {
1353 [STEDMA40_LCHAN_SRC_PHY_DST_LOG]
1354 = D40_DREG_PRMO_LCHAN_SRC_PHY_DST_LOG,
1355 [STEDMA40_LCHAN_SRC_LOG_DST_PHY]
1356 = D40_DREG_PRMO_LCHAN_SRC_LOG_DST_PHY,
1357 [STEDMA40_LCHAN_SRC_LOG_DST_LOG]
1358 = D40_DREG_PRMO_LCHAN_SRC_LOG_DST_LOG,
1359 };
1360
Rabin Vincent724a8572011-01-25 11:18:08 +01001361 if (chan_is_physical(d40c))
Rabin Vincent20a5b6d2010-10-12 13:00:52 +00001362 return phy_map[d40c->dma_cfg.mode_opt];
1363 else
1364 return log_map[d40c->dma_cfg.mode_opt];
1365}
1366
Jonas Aabergb55912c2010-08-09 12:08:02 +00001367static void d40_config_write(struct d40_chan *d40c)
Linus Walleij8d318a52010-03-30 15:33:42 +02001368{
1369 u32 addr_base;
1370 u32 var;
Linus Walleij8d318a52010-03-30 15:33:42 +02001371
1372 /* Odd addresses are even addresses + 4 */
1373 addr_base = (d40c->phy_chan->num % 2) * 4;
1374 /* Setup channel mode to logical or physical */
Rabin Vincent724a8572011-01-25 11:18:08 +01001375 var = ((u32)(chan_is_logical(d40c)) + 1) <<
Linus Walleij8d318a52010-03-30 15:33:42 +02001376 D40_CHAN_POS(d40c->phy_chan->num);
1377 writel(var, d40c->base->virtbase + D40_DREG_PRMSE + addr_base);
1378
1379 /* Setup operational mode option register */
Rabin Vincent20a5b6d2010-10-12 13:00:52 +00001380 var = d40_get_prmo(d40c) << D40_CHAN_POS(d40c->phy_chan->num);
Linus Walleij8d318a52010-03-30 15:33:42 +02001381
1382 writel(var, d40c->base->virtbase + D40_DREG_PRMOE + addr_base);
1383
Rabin Vincent724a8572011-01-25 11:18:08 +01001384 if (chan_is_logical(d40c)) {
Rabin Vincent8ca84682011-01-25 11:18:07 +01001385 int lidx = (d40c->phy_chan->num << D40_SREG_ELEM_LOG_LIDX_POS)
1386 & D40_SREG_ELEM_LOG_LIDX_MASK;
1387 void __iomem *chanbase = chan_base(d40c);
1388
Linus Walleij8d318a52010-03-30 15:33:42 +02001389 /* Set default config for CFG reg */
Rabin Vincent8ca84682011-01-25 11:18:07 +01001390 writel(d40c->src_def_cfg, chanbase + D40_CHAN_REG_SSCFG);
1391 writel(d40c->dst_def_cfg, chanbase + D40_CHAN_REG_SDCFG);
Linus Walleij8d318a52010-03-30 15:33:42 +02001392
Jonas Aabergb55912c2010-08-09 12:08:02 +00001393 /* Set LIDX for lcla */
Rabin Vincent8ca84682011-01-25 11:18:07 +01001394 writel(lidx, chanbase + D40_CHAN_REG_SSELT);
1395 writel(lidx, chanbase + D40_CHAN_REG_SDELT);
Rabin Vincente9f3a492011-12-28 11:27:40 +05301396
1397 /* Clear LNK which will be used by d40_chan_has_events() */
1398 writel(0, chanbase + D40_CHAN_REG_SSLNK);
1399 writel(0, chanbase + D40_CHAN_REG_SDLNK);
Linus Walleij8d318a52010-03-30 15:33:42 +02001400 }
Linus Walleij8d318a52010-03-30 15:33:42 +02001401}
1402
Jonas Aabergaa182ae2010-08-09 12:08:26 +00001403static u32 d40_residue(struct d40_chan *d40c)
1404{
1405 u32 num_elt;
1406
Rabin Vincent724a8572011-01-25 11:18:08 +01001407 if (chan_is_logical(d40c))
Jonas Aabergaa182ae2010-08-09 12:08:26 +00001408 num_elt = (readl(&d40c->lcpa->lcsp2) & D40_MEM_LCSP2_ECNT_MASK)
1409 >> D40_MEM_LCSP2_ECNT_POS;
Rabin Vincent8ca84682011-01-25 11:18:07 +01001410 else {
1411 u32 val = readl(chan_base(d40c) + D40_CHAN_REG_SDELT);
1412 num_elt = (val & D40_SREG_ELEM_PHY_ECNT_MASK)
1413 >> D40_SREG_ELEM_PHY_ECNT_POS;
1414 }
1415
Lee Jones43f2e1a2013-05-15 11:51:57 +02001416 return num_elt * d40c->dma_cfg.dst_info.data_width;
Jonas Aabergaa182ae2010-08-09 12:08:26 +00001417}
1418
1419static bool d40_tx_is_linked(struct d40_chan *d40c)
1420{
1421 bool is_link;
1422
Rabin Vincent724a8572011-01-25 11:18:08 +01001423 if (chan_is_logical(d40c))
Jonas Aabergaa182ae2010-08-09 12:08:26 +00001424 is_link = readl(&d40c->lcpa->lcsp3) & D40_MEM_LCSP3_DLOS_MASK;
1425 else
Rabin Vincent8ca84682011-01-25 11:18:07 +01001426 is_link = readl(chan_base(d40c) + D40_CHAN_REG_SDLNK)
1427 & D40_SREG_LNK_PHYS_LNK_MASK;
1428
Jonas Aabergaa182ae2010-08-09 12:08:26 +00001429 return is_link;
1430}
1431
Maxime Ripard6f5bad02014-11-17 14:42:36 +01001432static int d40_pause(struct dma_chan *chan)
Jonas Aabergaa182ae2010-08-09 12:08:26 +00001433{
Maxime Ripard6f5bad02014-11-17 14:42:36 +01001434 struct d40_chan *d40c = container_of(chan, struct d40_chan, chan);
Jonas Aabergaa182ae2010-08-09 12:08:26 +00001435 int res = 0;
1436 unsigned long flags;
1437
Maxime Ripard6f5bad02014-11-17 14:42:36 +01001438 if (d40c->phy_chan == NULL) {
1439 chan_err(d40c, "Channel is not allocated!\n");
1440 return -EINVAL;
1441 }
1442
Jonas Aaberg3ac012a2010-08-09 12:09:12 +00001443 if (!d40c->busy)
1444 return 0;
1445
Jonas Aabergaa182ae2010-08-09 12:08:26 +00001446 spin_lock_irqsave(&d40c->lock, flags);
Ulf Hansson80245212014-04-23 21:52:01 +02001447 pm_runtime_get_sync(d40c->base->dev);
Jonas Aabergaa182ae2010-08-09 12:08:26 +00001448
1449 res = d40_channel_execute_command(d40c, D40_DMA_SUSPEND_REQ);
Narayanan G1bdae6f2012-02-09 12:41:37 +05301450
Narayanan G7fb3e752011-11-17 17:26:41 +05301451 pm_runtime_mark_last_busy(d40c->base->dev);
1452 pm_runtime_put_autosuspend(d40c->base->dev);
Jonas Aabergaa182ae2010-08-09 12:08:26 +00001453 spin_unlock_irqrestore(&d40c->lock, flags);
1454 return res;
1455}
1456
Maxime Ripard6f5bad02014-11-17 14:42:36 +01001457static int d40_resume(struct dma_chan *chan)
Jonas Aabergaa182ae2010-08-09 12:08:26 +00001458{
Maxime Ripard6f5bad02014-11-17 14:42:36 +01001459 struct d40_chan *d40c = container_of(chan, struct d40_chan, chan);
Jonas Aabergaa182ae2010-08-09 12:08:26 +00001460 int res = 0;
1461 unsigned long flags;
1462
Maxime Ripard6f5bad02014-11-17 14:42:36 +01001463 if (d40c->phy_chan == NULL) {
1464 chan_err(d40c, "Channel is not allocated!\n");
1465 return -EINVAL;
1466 }
1467
Jonas Aaberg3ac012a2010-08-09 12:09:12 +00001468 if (!d40c->busy)
1469 return 0;
1470
Jonas Aabergaa182ae2010-08-09 12:08:26 +00001471 spin_lock_irqsave(&d40c->lock, flags);
Narayanan G7fb3e752011-11-17 17:26:41 +05301472 pm_runtime_get_sync(d40c->base->dev);
Jonas Aabergaa182ae2010-08-09 12:08:26 +00001473
1474 /* If bytes left to transfer or linked tx resume job */
Narayanan G1bdae6f2012-02-09 12:41:37 +05301475 if (d40_residue(d40c) || d40_tx_is_linked(d40c))
Jonas Aabergaa182ae2010-08-09 12:08:26 +00001476 res = d40_channel_execute_command(d40c, D40_DMA_RUN);
Jonas Aabergaa182ae2010-08-09 12:08:26 +00001477
Narayanan G7fb3e752011-11-17 17:26:41 +05301478 pm_runtime_mark_last_busy(d40c->base->dev);
1479 pm_runtime_put_autosuspend(d40c->base->dev);
Jonas Aabergaa182ae2010-08-09 12:08:26 +00001480 spin_unlock_irqrestore(&d40c->lock, flags);
1481 return res;
1482}
1483
Linus Walleij8d318a52010-03-30 15:33:42 +02001484static dma_cookie_t d40_tx_submit(struct dma_async_tx_descriptor *tx)
1485{
1486 struct d40_chan *d40c = container_of(tx->chan,
1487 struct d40_chan,
1488 chan);
1489 struct d40_desc *d40d = container_of(tx, struct d40_desc, txd);
1490 unsigned long flags;
Russell King - ARM Linux884485e2012-03-06 22:34:46 +00001491 dma_cookie_t cookie;
Linus Walleij8d318a52010-03-30 15:33:42 +02001492
1493 spin_lock_irqsave(&d40c->lock, flags);
Russell King - ARM Linux884485e2012-03-06 22:34:46 +00001494 cookie = dma_cookie_assign(tx);
Linus Walleij8d318a52010-03-30 15:33:42 +02001495 d40_desc_queue(d40c, d40d);
Linus Walleij8d318a52010-03-30 15:33:42 +02001496 spin_unlock_irqrestore(&d40c->lock, flags);
1497
Russell King - ARM Linux884485e2012-03-06 22:34:46 +00001498 return cookie;
Linus Walleij8d318a52010-03-30 15:33:42 +02001499}
1500
1501static int d40_start(struct d40_chan *d40c)
1502{
Jonas Aaberg0c322692010-06-20 21:25:46 +00001503 return d40_channel_execute_command(d40c, D40_DMA_RUN);
Linus Walleij8d318a52010-03-30 15:33:42 +02001504}
1505
1506static struct d40_desc *d40_queue_start(struct d40_chan *d40c)
1507{
1508 struct d40_desc *d40d;
1509 int err;
1510
1511 /* Start queued jobs, if any */
1512 d40d = d40_first_queued(d40c);
1513
1514 if (d40d != NULL) {
Narayanan G1bdae6f2012-02-09 12:41:37 +05301515 if (!d40c->busy) {
Narayanan G7fb3e752011-11-17 17:26:41 +05301516 d40c->busy = true;
Narayanan G1bdae6f2012-02-09 12:41:37 +05301517 pm_runtime_get_sync(d40c->base->dev);
1518 }
Linus Walleij8d318a52010-03-30 15:33:42 +02001519
1520 /* Remove from queue */
1521 d40_desc_remove(d40d);
1522
1523 /* Add to active queue */
1524 d40_desc_submit(d40c, d40d);
1525
Rabin Vincent7d83a852011-01-25 11:18:06 +01001526 /* Initiate DMA job */
1527 d40_desc_load(d40c, d40d);
Jonas Aaberg698e4732010-08-09 12:08:56 +00001528
Rabin Vincent7d83a852011-01-25 11:18:06 +01001529 /* Start dma job */
1530 err = d40_start(d40c);
Linus Walleij8d318a52010-03-30 15:33:42 +02001531
Rabin Vincent7d83a852011-01-25 11:18:06 +01001532 if (err)
1533 return NULL;
Linus Walleij8d318a52010-03-30 15:33:42 +02001534 }
1535
1536 return d40d;
1537}
1538
1539/* called from interrupt context */
1540static void dma_tc_handle(struct d40_chan *d40c)
1541{
1542 struct d40_desc *d40d;
1543
Linus Walleij8d318a52010-03-30 15:33:42 +02001544 /* Get first active entry from list */
1545 d40d = d40_first_active_get(d40c);
1546
1547 if (d40d == NULL)
1548 return;
1549
Rabin Vincent0c842b52011-01-25 11:18:35 +01001550 if (d40d->cyclic) {
1551 /*
1552 * If this was a paritially loaded list, we need to reloaded
1553 * it, and only when the list is completed. We need to check
1554 * for done because the interrupt will hit for every link, and
1555 * not just the last one.
1556 */
1557 if (d40d->lli_current < d40d->lli_len
1558 && !d40_tx_is_linked(d40c)
1559 && !d40_residue(d40c)) {
1560 d40_lcla_free_all(d40c, d40d);
1561 d40_desc_load(d40c, d40d);
1562 (void) d40_start(d40c);
Linus Walleij8d318a52010-03-30 15:33:42 +02001563
Rabin Vincent0c842b52011-01-25 11:18:35 +01001564 if (d40d->lli_current == d40d->lli_len)
1565 d40d->lli_current = 0;
1566 }
1567 } else {
1568 d40_lcla_free_all(d40c, d40d);
1569
1570 if (d40d->lli_current < d40d->lli_len) {
1571 d40_desc_load(d40c, d40d);
1572 /* Start dma job */
1573 (void) d40_start(d40c);
1574 return;
1575 }
1576
Rabin Vincent9ecb41b2013-05-27 16:03:40 +02001577 if (d40_queue_start(d40c) == NULL) {
Rabin Vincent0c842b52011-01-25 11:18:35 +01001578 d40c->busy = false;
Rabin Vincent9ecb41b2013-05-27 16:03:40 +02001579
1580 pm_runtime_mark_last_busy(d40c->base->dev);
1581 pm_runtime_put_autosuspend(d40c->base->dev);
1582 }
Linus Walleij8d318a52010-03-30 15:33:42 +02001583
Fabio Baltieri7dd14522013-02-14 10:03:10 +01001584 d40_desc_remove(d40d);
1585 d40_desc_done(d40c, d40d);
1586 }
Fabio Baltieri4226dd82012-12-13 13:46:16 +01001587
Linus Walleij8d318a52010-03-30 15:33:42 +02001588 d40c->pending_tx++;
1589 tasklet_schedule(&d40c->tasklet);
1590
1591}
1592
1593static void dma_tasklet(unsigned long data)
1594{
1595 struct d40_chan *d40c = (struct d40_chan *) data;
Jonas Aaberg767a9672010-08-09 12:08:34 +00001596 struct d40_desc *d40d;
Linus Walleij8d318a52010-03-30 15:33:42 +02001597 unsigned long flags;
Linus Walleije9baa9d2014-02-13 10:39:01 +01001598 bool callback_active;
Linus Walleij8d318a52010-03-30 15:33:42 +02001599 dma_async_tx_callback callback;
1600 void *callback_param;
1601
1602 spin_lock_irqsave(&d40c->lock, flags);
1603
Fabio Baltieri4226dd82012-12-13 13:46:16 +01001604 /* Get first entry from the done list */
1605 d40d = d40_first_done(d40c);
1606 if (d40d == NULL) {
1607 /* Check if we have reached here for cyclic job */
1608 d40d = d40_first_active_get(d40c);
1609 if (d40d == NULL || !d40d->cyclic)
1610 goto err;
1611 }
Linus Walleij8d318a52010-03-30 15:33:42 +02001612
Rabin Vincent0c842b52011-01-25 11:18:35 +01001613 if (!d40d->cyclic)
Russell King - ARM Linuxf7fbce02012-03-06 22:35:07 +00001614 dma_cookie_complete(&d40d->txd);
Linus Walleij8d318a52010-03-30 15:33:42 +02001615
1616 /*
1617 * If terminating a channel pending_tx is set to zero.
1618 * This prevents any finished active jobs to return to the client.
1619 */
1620 if (d40c->pending_tx == 0) {
1621 spin_unlock_irqrestore(&d40c->lock, flags);
1622 return;
1623 }
1624
1625 /* Callback to client */
Linus Walleije9baa9d2014-02-13 10:39:01 +01001626 callback_active = !!(d40d->txd.flags & DMA_PREP_INTERRUPT);
Jonas Aaberg767a9672010-08-09 12:08:34 +00001627 callback = d40d->txd.callback;
1628 callback_param = d40d->txd.callback_param;
Linus Walleij8d318a52010-03-30 15:33:42 +02001629
Rabin Vincent0c842b52011-01-25 11:18:35 +01001630 if (!d40d->cyclic) {
1631 if (async_tx_test_ack(&d40d->txd)) {
Jonas Aaberg767a9672010-08-09 12:08:34 +00001632 d40_desc_remove(d40d);
Rabin Vincent0c842b52011-01-25 11:18:35 +01001633 d40_desc_free(d40c, d40d);
Fabio Baltierif26e03a2012-12-13 17:12:37 +01001634 } else if (!d40d->is_in_client_list) {
1635 d40_desc_remove(d40d);
1636 d40_lcla_free_all(d40c, d40d);
1637 list_add_tail(&d40d->node, &d40c->client);
1638 d40d->is_in_client_list = true;
Linus Walleij8d318a52010-03-30 15:33:42 +02001639 }
1640 }
1641
1642 d40c->pending_tx--;
1643
1644 if (d40c->pending_tx)
1645 tasklet_schedule(&d40c->tasklet);
1646
1647 spin_unlock_irqrestore(&d40c->lock, flags);
1648
Linus Walleije9baa9d2014-02-13 10:39:01 +01001649 if (callback_active && callback)
Linus Walleij8d318a52010-03-30 15:33:42 +02001650 callback(callback_param);
1651
1652 return;
1653
Narayanan G1bdae6f2012-02-09 12:41:37 +05301654err:
1655 /* Rescue manouver if receiving double interrupts */
Linus Walleij8d318a52010-03-30 15:33:42 +02001656 if (d40c->pending_tx > 0)
1657 d40c->pending_tx--;
1658 spin_unlock_irqrestore(&d40c->lock, flags);
1659}
1660
1661static irqreturn_t d40_handle_interrupt(int irq, void *data)
1662{
Linus Walleij8d318a52010-03-30 15:33:42 +02001663 int i;
Linus Walleij8d318a52010-03-30 15:33:42 +02001664 u32 idx;
1665 u32 row;
1666 long chan = -1;
1667 struct d40_chan *d40c;
1668 unsigned long flags;
1669 struct d40_base *base = data;
Tong Liu3cb645d2012-09-26 10:07:30 +00001670 u32 regs[base->gen_dmac.il_size];
1671 struct d40_interrupt_lookup *il = base->gen_dmac.il;
1672 u32 il_size = base->gen_dmac.il_size;
Linus Walleij8d318a52010-03-30 15:33:42 +02001673
1674 spin_lock_irqsave(&base->interrupt_lock, flags);
1675
1676 /* Read interrupt status of both logical and physical channels */
Tong Liu3cb645d2012-09-26 10:07:30 +00001677 for (i = 0; i < il_size; i++)
Linus Walleij8d318a52010-03-30 15:33:42 +02001678 regs[i] = readl(base->virtbase + il[i].src);
1679
1680 for (;;) {
1681
1682 chan = find_next_bit((unsigned long *)regs,
Tong Liu3cb645d2012-09-26 10:07:30 +00001683 BITS_PER_LONG * il_size, chan + 1);
Linus Walleij8d318a52010-03-30 15:33:42 +02001684
1685 /* No more set bits found? */
Tong Liu3cb645d2012-09-26 10:07:30 +00001686 if (chan == BITS_PER_LONG * il_size)
Linus Walleij8d318a52010-03-30 15:33:42 +02001687 break;
1688
1689 row = chan / BITS_PER_LONG;
1690 idx = chan & (BITS_PER_LONG - 1);
1691
Linus Walleij8d318a52010-03-30 15:33:42 +02001692 if (il[row].offset == D40_PHY_CHAN)
1693 d40c = base->lookup_phy_chans[idx];
1694 else
1695 d40c = base->lookup_log_chans[il[row].offset + idx];
Fabio Baltieri53d6d682012-12-19 14:41:56 +01001696
1697 if (!d40c) {
1698 /*
1699 * No error because this can happen if something else
1700 * in the system is using the channel.
1701 */
1702 continue;
1703 }
1704
1705 /* ACK interrupt */
Lee Jones8a3b6e12013-05-15 10:51:52 +01001706 writel(BIT(idx), base->virtbase + il[row].clr);
Fabio Baltieri53d6d682012-12-19 14:41:56 +01001707
Linus Walleij8d318a52010-03-30 15:33:42 +02001708 spin_lock(&d40c->lock);
1709
1710 if (!il[row].is_error)
1711 dma_tc_handle(d40c);
1712 else
Rabin Vincent6db5a8b2011-01-25 11:18:09 +01001713 d40_err(base->dev, "IRQ chan: %ld offset %d idx %d\n",
1714 chan, il[row].offset, idx);
Linus Walleij8d318a52010-03-30 15:33:42 +02001715
1716 spin_unlock(&d40c->lock);
1717 }
1718
1719 spin_unlock_irqrestore(&base->interrupt_lock, flags);
1720
1721 return IRQ_HANDLED;
1722}
1723
Linus Walleij8d318a52010-03-30 15:33:42 +02001724static int d40_validate_conf(struct d40_chan *d40c,
1725 struct stedma40_chan_cfg *conf)
1726{
1727 int res = 0;
Rabin Vincent38bdbf02010-10-12 13:00:51 +00001728 bool is_log = conf->mode == STEDMA40_MODE_LOGICAL;
Linus Walleij8d318a52010-03-30 15:33:42 +02001729
Linus Walleij0747c7ba2010-08-09 12:07:36 +00001730 if (!conf->dir) {
Rabin Vincent6db5a8b2011-01-25 11:18:09 +01001731 chan_err(d40c, "Invalid direction.\n");
Linus Walleij0747c7ba2010-08-09 12:07:36 +00001732 res = -EINVAL;
1733 }
1734
Lee Jones26955c07d2013-05-03 15:31:56 +01001735 if ((is_log && conf->dev_type > d40c->base->num_log_chans) ||
1736 (!is_log && conf->dev_type > d40c->base->num_phy_chans) ||
1737 (conf->dev_type < 0)) {
1738 chan_err(d40c, "Invalid device type (%d)\n", conf->dev_type);
Linus Walleij0747c7ba2010-08-09 12:07:36 +00001739 res = -EINVAL;
1740 }
1741
Lee Jones2c2b62d2013-05-15 10:51:54 +01001742 if (conf->dir == DMA_DEV_TO_DEV) {
Linus Walleij8d318a52010-03-30 15:33:42 +02001743 /*
1744 * DMAC HW supports it. Will be added to this driver,
1745 * in case any dma client requires it.
1746 */
Rabin Vincent6db5a8b2011-01-25 11:18:09 +01001747 chan_err(d40c, "periph to periph not supported\n");
Linus Walleij8d318a52010-03-30 15:33:42 +02001748 res = -EINVAL;
1749 }
1750
Per Forlind49278e2010-12-20 18:31:38 +01001751 if (d40_psize_2_burst_size(is_log, conf->src_info.psize) *
Lee Jones43f2e1a2013-05-15 11:51:57 +02001752 conf->src_info.data_width !=
Per Forlind49278e2010-12-20 18:31:38 +01001753 d40_psize_2_burst_size(is_log, conf->dst_info.psize) *
Lee Jones43f2e1a2013-05-15 11:51:57 +02001754 conf->dst_info.data_width) {
Per Forlind49278e2010-12-20 18:31:38 +01001755 /*
1756 * The DMAC hardware only supports
1757 * src (burst x width) == dst (burst x width)
1758 */
1759
Rabin Vincent6db5a8b2011-01-25 11:18:09 +01001760 chan_err(d40c, "src (burst x width) != dst (burst x width)\n");
Per Forlind49278e2010-12-20 18:31:38 +01001761 res = -EINVAL;
1762 }
1763
Linus Walleij8d318a52010-03-30 15:33:42 +02001764 return res;
1765}
1766
Narayanan G5cd326f2011-11-30 19:20:42 +05301767static bool d40_alloc_mask_set(struct d40_phy_res *phy,
1768 bool is_src, int log_event_line, bool is_log,
1769 bool *first_user)
Linus Walleij8d318a52010-03-30 15:33:42 +02001770{
1771 unsigned long flags;
1772 spin_lock_irqsave(&phy->lock, flags);
Narayanan G5cd326f2011-11-30 19:20:42 +05301773
1774 *first_user = ((phy->allocated_src | phy->allocated_dst)
1775 == D40_ALLOC_FREE);
1776
Marcin Mielczarczyk4aed79b2010-05-18 00:41:21 +02001777 if (!is_log) {
Linus Walleij8d318a52010-03-30 15:33:42 +02001778 /* Physical interrupts are masked per physical full channel */
1779 if (phy->allocated_src == D40_ALLOC_FREE &&
1780 phy->allocated_dst == D40_ALLOC_FREE) {
1781 phy->allocated_dst = D40_ALLOC_PHY;
1782 phy->allocated_src = D40_ALLOC_PHY;
1783 goto found;
1784 } else
1785 goto not_found;
1786 }
1787
1788 /* Logical channel */
1789 if (is_src) {
1790 if (phy->allocated_src == D40_ALLOC_PHY)
1791 goto not_found;
1792
1793 if (phy->allocated_src == D40_ALLOC_FREE)
1794 phy->allocated_src = D40_ALLOC_LOG_FREE;
1795
Lee Jones8a3b6e12013-05-15 10:51:52 +01001796 if (!(phy->allocated_src & BIT(log_event_line))) {
1797 phy->allocated_src |= BIT(log_event_line);
Linus Walleij8d318a52010-03-30 15:33:42 +02001798 goto found;
1799 } else
1800 goto not_found;
1801 } else {
1802 if (phy->allocated_dst == D40_ALLOC_PHY)
1803 goto not_found;
1804
1805 if (phy->allocated_dst == D40_ALLOC_FREE)
1806 phy->allocated_dst = D40_ALLOC_LOG_FREE;
1807
Lee Jones8a3b6e12013-05-15 10:51:52 +01001808 if (!(phy->allocated_dst & BIT(log_event_line))) {
1809 phy->allocated_dst |= BIT(log_event_line);
Linus Walleij8d318a52010-03-30 15:33:42 +02001810 goto found;
1811 } else
1812 goto not_found;
1813 }
1814
1815not_found:
1816 spin_unlock_irqrestore(&phy->lock, flags);
1817 return false;
1818found:
1819 spin_unlock_irqrestore(&phy->lock, flags);
1820 return true;
1821}
1822
1823static bool d40_alloc_mask_free(struct d40_phy_res *phy, bool is_src,
1824 int log_event_line)
1825{
1826 unsigned long flags;
1827 bool is_free = false;
1828
1829 spin_lock_irqsave(&phy->lock, flags);
1830 if (!log_event_line) {
Linus Walleij8d318a52010-03-30 15:33:42 +02001831 phy->allocated_dst = D40_ALLOC_FREE;
1832 phy->allocated_src = D40_ALLOC_FREE;
1833 is_free = true;
1834 goto out;
1835 }
1836
1837 /* Logical channel */
1838 if (is_src) {
Lee Jones8a3b6e12013-05-15 10:51:52 +01001839 phy->allocated_src &= ~BIT(log_event_line);
Linus Walleij8d318a52010-03-30 15:33:42 +02001840 if (phy->allocated_src == D40_ALLOC_LOG_FREE)
1841 phy->allocated_src = D40_ALLOC_FREE;
1842 } else {
Lee Jones8a3b6e12013-05-15 10:51:52 +01001843 phy->allocated_dst &= ~BIT(log_event_line);
Linus Walleij8d318a52010-03-30 15:33:42 +02001844 if (phy->allocated_dst == D40_ALLOC_LOG_FREE)
1845 phy->allocated_dst = D40_ALLOC_FREE;
1846 }
1847
1848 is_free = ((phy->allocated_src | phy->allocated_dst) ==
1849 D40_ALLOC_FREE);
1850
1851out:
1852 spin_unlock_irqrestore(&phy->lock, flags);
1853
1854 return is_free;
1855}
1856
Narayanan G5cd326f2011-11-30 19:20:42 +05301857static int d40_allocate_channel(struct d40_chan *d40c, bool *first_phy_user)
Linus Walleij8d318a52010-03-30 15:33:42 +02001858{
Lee Jones26955c07d2013-05-03 15:31:56 +01001859 int dev_type = d40c->dma_cfg.dev_type;
Linus Walleij8d318a52010-03-30 15:33:42 +02001860 int event_group;
1861 int event_line;
1862 struct d40_phy_res *phys;
1863 int i;
1864 int j;
1865 int log_num;
Gerald Baezaf000df82012-11-08 14:39:07 +01001866 int num_phy_chans;
Linus Walleij8d318a52010-03-30 15:33:42 +02001867 bool is_src;
Rabin Vincent38bdbf02010-10-12 13:00:51 +00001868 bool is_log = d40c->dma_cfg.mode == STEDMA40_MODE_LOGICAL;
Linus Walleij8d318a52010-03-30 15:33:42 +02001869
1870 phys = d40c->base->phy_res;
Gerald Baezaf000df82012-11-08 14:39:07 +01001871 num_phy_chans = d40c->base->num_phy_chans;
Linus Walleij8d318a52010-03-30 15:33:42 +02001872
Lee Jones2c2b62d2013-05-15 10:51:54 +01001873 if (d40c->dma_cfg.dir == DMA_DEV_TO_MEM) {
Linus Walleij8d318a52010-03-30 15:33:42 +02001874 log_num = 2 * dev_type;
1875 is_src = true;
Lee Jones2c2b62d2013-05-15 10:51:54 +01001876 } else if (d40c->dma_cfg.dir == DMA_MEM_TO_DEV ||
1877 d40c->dma_cfg.dir == DMA_MEM_TO_MEM) {
Linus Walleij8d318a52010-03-30 15:33:42 +02001878 /* dst event lines are used for logical memcpy */
Linus Walleij8d318a52010-03-30 15:33:42 +02001879 log_num = 2 * dev_type + 1;
1880 is_src = false;
1881 } else
1882 return -EINVAL;
1883
1884 event_group = D40_TYPE_TO_GROUP(dev_type);
1885 event_line = D40_TYPE_TO_EVENT(dev_type);
1886
1887 if (!is_log) {
Lee Jones2c2b62d2013-05-15 10:51:54 +01001888 if (d40c->dma_cfg.dir == DMA_MEM_TO_MEM) {
Linus Walleij8d318a52010-03-30 15:33:42 +02001889 /* Find physical half channel */
Gerald Baezaf000df82012-11-08 14:39:07 +01001890 if (d40c->dma_cfg.use_fixed_channel) {
1891 i = d40c->dma_cfg.phy_channel;
Marcin Mielczarczyk4aed79b2010-05-18 00:41:21 +02001892 if (d40_alloc_mask_set(&phys[i], is_src,
Narayanan G5cd326f2011-11-30 19:20:42 +05301893 0, is_log,
1894 first_phy_user))
Linus Walleij8d318a52010-03-30 15:33:42 +02001895 goto found_phy;
Gerald Baezaf000df82012-11-08 14:39:07 +01001896 } else {
1897 for (i = 0; i < num_phy_chans; i++) {
1898 if (d40_alloc_mask_set(&phys[i], is_src,
1899 0, is_log,
1900 first_phy_user))
1901 goto found_phy;
1902 }
Linus Walleij8d318a52010-03-30 15:33:42 +02001903 }
1904 } else
1905 for (j = 0; j < d40c->base->num_phy_chans; j += 8) {
1906 int phy_num = j + event_group * 2;
1907 for (i = phy_num; i < phy_num + 2; i++) {
Linus Walleij508849a2010-06-20 21:26:07 +00001908 if (d40_alloc_mask_set(&phys[i],
1909 is_src,
1910 0,
Narayanan G5cd326f2011-11-30 19:20:42 +05301911 is_log,
1912 first_phy_user))
Linus Walleij8d318a52010-03-30 15:33:42 +02001913 goto found_phy;
1914 }
1915 }
1916 return -EINVAL;
1917found_phy:
1918 d40c->phy_chan = &phys[i];
1919 d40c->log_num = D40_PHY_CHAN;
1920 goto out;
1921 }
1922 if (dev_type == -1)
1923 return -EINVAL;
1924
1925 /* Find logical channel */
1926 for (j = 0; j < d40c->base->num_phy_chans; j += 8) {
1927 int phy_num = j + event_group * 2;
Narayanan G5cd326f2011-11-30 19:20:42 +05301928
1929 if (d40c->dma_cfg.use_fixed_channel) {
1930 i = d40c->dma_cfg.phy_channel;
1931
1932 if ((i != phy_num) && (i != phy_num + 1)) {
1933 dev_err(chan2dev(d40c),
1934 "invalid fixed phy channel %d\n", i);
1935 return -EINVAL;
1936 }
1937
1938 if (d40_alloc_mask_set(&phys[i], is_src, event_line,
1939 is_log, first_phy_user))
1940 goto found_log;
1941
1942 dev_err(chan2dev(d40c),
1943 "could not allocate fixed phy channel %d\n", i);
1944 return -EINVAL;
1945 }
1946
Linus Walleij8d318a52010-03-30 15:33:42 +02001947 /*
1948 * Spread logical channels across all available physical rather
1949 * than pack every logical channel at the first available phy
1950 * channels.
1951 */
1952 if (is_src) {
1953 for (i = phy_num; i < phy_num + 2; i++) {
1954 if (d40_alloc_mask_set(&phys[i], is_src,
Narayanan G5cd326f2011-11-30 19:20:42 +05301955 event_line, is_log,
1956 first_phy_user))
Linus Walleij8d318a52010-03-30 15:33:42 +02001957 goto found_log;
1958 }
1959 } else {
1960 for (i = phy_num + 1; i >= phy_num; i--) {
1961 if (d40_alloc_mask_set(&phys[i], is_src,
Narayanan G5cd326f2011-11-30 19:20:42 +05301962 event_line, is_log,
1963 first_phy_user))
Linus Walleij8d318a52010-03-30 15:33:42 +02001964 goto found_log;
1965 }
1966 }
1967 }
1968 return -EINVAL;
1969
1970found_log:
1971 d40c->phy_chan = &phys[i];
1972 d40c->log_num = log_num;
1973out:
1974
1975 if (is_log)
1976 d40c->base->lookup_log_chans[d40c->log_num] = d40c;
1977 else
1978 d40c->base->lookup_phy_chans[d40c->phy_chan->num] = d40c;
1979
1980 return 0;
1981
1982}
1983
Linus Walleij8d318a52010-03-30 15:33:42 +02001984static int d40_config_memcpy(struct d40_chan *d40c)
1985{
1986 dma_cap_mask_t cap = d40c->chan.device->cap_mask;
1987
1988 if (dma_has_cap(DMA_MEMCPY, cap) && !dma_has_cap(DMA_SLAVE, cap)) {
Lee Jones29027a12013-05-03 15:31:54 +01001989 d40c->dma_cfg = dma40_memcpy_conf_log;
Lee Jones26955c07d2013-05-03 15:31:56 +01001990 d40c->dma_cfg.dev_type = dma40_memcpy_channels[d40c->chan.chan_id];
Linus Walleij8d318a52010-03-30 15:33:42 +02001991
Lee Jones9b233f92013-05-15 10:51:26 +01001992 d40_log_cfg(&d40c->dma_cfg,
1993 &d40c->log_def.lcsp1, &d40c->log_def.lcsp3);
1994
Linus Walleij8d318a52010-03-30 15:33:42 +02001995 } else if (dma_has_cap(DMA_MEMCPY, cap) &&
1996 dma_has_cap(DMA_SLAVE, cap)) {
Lee Jones29027a12013-05-03 15:31:54 +01001997 d40c->dma_cfg = dma40_memcpy_conf_phy;
Lee Jones57e65ad2013-05-15 10:51:25 +01001998
1999 /* Generate interrrupt at end of transfer or relink. */
2000 d40c->dst_def_cfg |= BIT(D40_SREG_CFG_TIM_POS);
2001
2002 /* Generate interrupt on error. */
2003 d40c->src_def_cfg |= BIT(D40_SREG_CFG_EIM_POS);
2004 d40c->dst_def_cfg |= BIT(D40_SREG_CFG_EIM_POS);
2005
Linus Walleij8d318a52010-03-30 15:33:42 +02002006 } else {
Rabin Vincent6db5a8b2011-01-25 11:18:09 +01002007 chan_err(d40c, "No memcpy\n");
Linus Walleij8d318a52010-03-30 15:33:42 +02002008 return -EINVAL;
2009 }
2010
2011 return 0;
2012}
2013
Linus Walleij8d318a52010-03-30 15:33:42 +02002014static int d40_free_dma(struct d40_chan *d40c)
2015{
2016
2017 int res = 0;
Lee Jones26955c07d2013-05-03 15:31:56 +01002018 u32 event = D40_TYPE_TO_EVENT(d40c->dma_cfg.dev_type);
Linus Walleij8d318a52010-03-30 15:33:42 +02002019 struct d40_phy_res *phy = d40c->phy_chan;
2020 bool is_src;
2021
2022 /* Terminate all queued and active transfers */
2023 d40_term_all(d40c);
2024
2025 if (phy == NULL) {
Rabin Vincent6db5a8b2011-01-25 11:18:09 +01002026 chan_err(d40c, "phy == null\n");
Linus Walleij8d318a52010-03-30 15:33:42 +02002027 return -EINVAL;
2028 }
2029
2030 if (phy->allocated_src == D40_ALLOC_FREE &&
2031 phy->allocated_dst == D40_ALLOC_FREE) {
Rabin Vincent6db5a8b2011-01-25 11:18:09 +01002032 chan_err(d40c, "channel already free\n");
Linus Walleij8d318a52010-03-30 15:33:42 +02002033 return -EINVAL;
2034 }
2035
Lee Jones2c2b62d2013-05-15 10:51:54 +01002036 if (d40c->dma_cfg.dir == DMA_MEM_TO_DEV ||
2037 d40c->dma_cfg.dir == DMA_MEM_TO_MEM)
Linus Walleij8d318a52010-03-30 15:33:42 +02002038 is_src = false;
Lee Jones2c2b62d2013-05-15 10:51:54 +01002039 else if (d40c->dma_cfg.dir == DMA_DEV_TO_MEM)
Linus Walleij8d318a52010-03-30 15:33:42 +02002040 is_src = true;
Lee Jones26955c07d2013-05-03 15:31:56 +01002041 else {
Rabin Vincent6db5a8b2011-01-25 11:18:09 +01002042 chan_err(d40c, "Unknown direction\n");
Linus Walleij8d318a52010-03-30 15:33:42 +02002043 return -EINVAL;
2044 }
2045
Narayanan G7fb3e752011-11-17 17:26:41 +05302046 pm_runtime_get_sync(d40c->base->dev);
Linus Walleij8d318a52010-03-30 15:33:42 +02002047 res = d40_channel_execute_command(d40c, D40_DMA_STOP);
2048 if (res) {
Narayanan G1bdae6f2012-02-09 12:41:37 +05302049 chan_err(d40c, "stop failed\n");
Narayanan G7fb3e752011-11-17 17:26:41 +05302050 goto out;
Linus Walleij8d318a52010-03-30 15:33:42 +02002051 }
Narayanan G7fb3e752011-11-17 17:26:41 +05302052
Narayanan G1bdae6f2012-02-09 12:41:37 +05302053 d40_alloc_mask_free(phy, is_src, chan_is_logical(d40c) ? event : 0);
2054
2055 if (chan_is_logical(d40c))
2056 d40c->base->lookup_log_chans[d40c->log_num] = NULL;
2057 else
2058 d40c->base->lookup_phy_chans[phy->num] = NULL;
2059
Narayanan G7fb3e752011-11-17 17:26:41 +05302060 if (d40c->busy) {
2061 pm_runtime_mark_last_busy(d40c->base->dev);
2062 pm_runtime_put_autosuspend(d40c->base->dev);
2063 }
2064
2065 d40c->busy = false;
Linus Walleij8d318a52010-03-30 15:33:42 +02002066 d40c->phy_chan = NULL;
Rabin Vincentce2ca122010-10-12 13:00:49 +00002067 d40c->configured = false;
Narayanan G7fb3e752011-11-17 17:26:41 +05302068out:
Linus Walleij8d318a52010-03-30 15:33:42 +02002069
Narayanan G7fb3e752011-11-17 17:26:41 +05302070 pm_runtime_mark_last_busy(d40c->base->dev);
2071 pm_runtime_put_autosuspend(d40c->base->dev);
2072 return res;
Linus Walleij8d318a52010-03-30 15:33:42 +02002073}
2074
Jonas Aaberga5ebca42010-05-18 00:41:09 +02002075static bool d40_is_paused(struct d40_chan *d40c)
2076{
Rabin Vincent8ca84682011-01-25 11:18:07 +01002077 void __iomem *chanbase = chan_base(d40c);
Jonas Aaberga5ebca42010-05-18 00:41:09 +02002078 bool is_paused = false;
2079 unsigned long flags;
2080 void __iomem *active_reg;
2081 u32 status;
Lee Jones26955c07d2013-05-03 15:31:56 +01002082 u32 event = D40_TYPE_TO_EVENT(d40c->dma_cfg.dev_type);
Jonas Aaberga5ebca42010-05-18 00:41:09 +02002083
2084 spin_lock_irqsave(&d40c->lock, flags);
2085
Rabin Vincent724a8572011-01-25 11:18:08 +01002086 if (chan_is_physical(d40c)) {
Jonas Aaberga5ebca42010-05-18 00:41:09 +02002087 if (d40c->phy_chan->num % 2 == 0)
2088 active_reg = d40c->base->virtbase + D40_DREG_ACTIVE;
2089 else
2090 active_reg = d40c->base->virtbase + D40_DREG_ACTIVO;
2091
2092 status = (readl(active_reg) &
2093 D40_CHAN_POS_MASK(d40c->phy_chan->num)) >>
2094 D40_CHAN_POS(d40c->phy_chan->num);
2095 if (status == D40_DMA_SUSPENDED || status == D40_DMA_STOP)
2096 is_paused = true;
2097
2098 goto _exit;
2099 }
2100
Lee Jones2c2b62d2013-05-15 10:51:54 +01002101 if (d40c->dma_cfg.dir == DMA_MEM_TO_DEV ||
2102 d40c->dma_cfg.dir == DMA_MEM_TO_MEM) {
Rabin Vincent8ca84682011-01-25 11:18:07 +01002103 status = readl(chanbase + D40_CHAN_REG_SDLNK);
Lee Jones2c2b62d2013-05-15 10:51:54 +01002104 } else if (d40c->dma_cfg.dir == DMA_DEV_TO_MEM) {
Rabin Vincent8ca84682011-01-25 11:18:07 +01002105 status = readl(chanbase + D40_CHAN_REG_SSLNK);
Jonas Aaberg9dbfbd35c2010-08-09 12:08:41 +00002106 } else {
Rabin Vincent6db5a8b2011-01-25 11:18:09 +01002107 chan_err(d40c, "Unknown direction\n");
Jonas Aaberga5ebca42010-05-18 00:41:09 +02002108 goto _exit;
2109 }
Jonas Aaberg9dbfbd35c2010-08-09 12:08:41 +00002110
Jonas Aaberga5ebca42010-05-18 00:41:09 +02002111 status = (status & D40_EVENTLINE_MASK(event)) >>
2112 D40_EVENTLINE_POS(event);
2113
2114 if (status != D40_DMA_RUN)
2115 is_paused = true;
Jonas Aaberga5ebca42010-05-18 00:41:09 +02002116_exit:
2117 spin_unlock_irqrestore(&d40c->lock, flags);
2118 return is_paused;
2119
2120}
2121
Linus Walleij8d318a52010-03-30 15:33:42 +02002122static u32 stedma40_residue(struct dma_chan *chan)
2123{
2124 struct d40_chan *d40c =
2125 container_of(chan, struct d40_chan, chan);
2126 u32 bytes_left;
2127 unsigned long flags;
2128
2129 spin_lock_irqsave(&d40c->lock, flags);
2130 bytes_left = d40_residue(d40c);
2131 spin_unlock_irqrestore(&d40c->lock, flags);
2132
2133 return bytes_left;
2134}
2135
Rabin Vincent3e3a0762011-01-25 11:18:21 +01002136static int
2137d40_prep_sg_log(struct d40_chan *chan, struct d40_desc *desc,
2138 struct scatterlist *sg_src, struct scatterlist *sg_dst,
Rabin Vincent822c5672011-01-25 11:18:28 +01002139 unsigned int sg_len, dma_addr_t src_dev_addr,
2140 dma_addr_t dst_dev_addr)
Rabin Vincent3e3a0762011-01-25 11:18:21 +01002141{
2142 struct stedma40_chan_cfg *cfg = &chan->dma_cfg;
2143 struct stedma40_half_channel_info *src_info = &cfg->src_info;
2144 struct stedma40_half_channel_info *dst_info = &cfg->dst_info;
Rabin Vincent5ed04b82011-01-25 11:18:26 +01002145 int ret;
Rabin Vincent3e3a0762011-01-25 11:18:21 +01002146
Rabin Vincent5ed04b82011-01-25 11:18:26 +01002147 ret = d40_log_sg_to_lli(sg_src, sg_len,
2148 src_dev_addr,
2149 desc->lli_log.src,
2150 chan->log_def.lcsp1,
2151 src_info->data_width,
2152 dst_info->data_width);
Rabin Vincent3e3a0762011-01-25 11:18:21 +01002153
Rabin Vincent5ed04b82011-01-25 11:18:26 +01002154 ret = d40_log_sg_to_lli(sg_dst, sg_len,
2155 dst_dev_addr,
2156 desc->lli_log.dst,
2157 chan->log_def.lcsp3,
2158 dst_info->data_width,
2159 src_info->data_width);
Rabin Vincent3e3a0762011-01-25 11:18:21 +01002160
Rabin Vincent5ed04b82011-01-25 11:18:26 +01002161 return ret < 0 ? ret : 0;
Rabin Vincent3e3a0762011-01-25 11:18:21 +01002162}
2163
2164static int
2165d40_prep_sg_phy(struct d40_chan *chan, struct d40_desc *desc,
2166 struct scatterlist *sg_src, struct scatterlist *sg_dst,
Rabin Vincent822c5672011-01-25 11:18:28 +01002167 unsigned int sg_len, dma_addr_t src_dev_addr,
2168 dma_addr_t dst_dev_addr)
Rabin Vincent3e3a0762011-01-25 11:18:21 +01002169{
Rabin Vincent3e3a0762011-01-25 11:18:21 +01002170 struct stedma40_chan_cfg *cfg = &chan->dma_cfg;
2171 struct stedma40_half_channel_info *src_info = &cfg->src_info;
2172 struct stedma40_half_channel_info *dst_info = &cfg->dst_info;
Rabin Vincent0c842b52011-01-25 11:18:35 +01002173 unsigned long flags = 0;
Rabin Vincent3e3a0762011-01-25 11:18:21 +01002174 int ret;
2175
Rabin Vincent0c842b52011-01-25 11:18:35 +01002176 if (desc->cyclic)
2177 flags |= LLI_CYCLIC | LLI_TERM_INT;
2178
Rabin Vincent3e3a0762011-01-25 11:18:21 +01002179 ret = d40_phy_sg_to_lli(sg_src, sg_len, src_dev_addr,
2180 desc->lli_phy.src,
2181 virt_to_phys(desc->lli_phy.src),
2182 chan->src_def_cfg,
Rabin Vincent0c842b52011-01-25 11:18:35 +01002183 src_info, dst_info, flags);
Rabin Vincent3e3a0762011-01-25 11:18:21 +01002184
2185 ret = d40_phy_sg_to_lli(sg_dst, sg_len, dst_dev_addr,
2186 desc->lli_phy.dst,
2187 virt_to_phys(desc->lli_phy.dst),
2188 chan->dst_def_cfg,
Rabin Vincent0c842b52011-01-25 11:18:35 +01002189 dst_info, src_info, flags);
Rabin Vincent3e3a0762011-01-25 11:18:21 +01002190
2191 dma_sync_single_for_device(chan->base->dev, desc->lli_pool.dma_addr,
2192 desc->lli_pool.size, DMA_TO_DEVICE);
2193
2194 return ret < 0 ? ret : 0;
2195}
2196
Rabin Vincent5f811582011-01-25 11:18:18 +01002197static struct d40_desc *
2198d40_prep_desc(struct d40_chan *chan, struct scatterlist *sg,
2199 unsigned int sg_len, unsigned long dma_flags)
2200{
2201 struct stedma40_chan_cfg *cfg = &chan->dma_cfg;
2202 struct d40_desc *desc;
Rabin Vincentdbd88782011-01-25 11:18:19 +01002203 int ret;
Rabin Vincent5f811582011-01-25 11:18:18 +01002204
2205 desc = d40_desc_get(chan);
2206 if (!desc)
2207 return NULL;
2208
2209 desc->lli_len = d40_sg_2_dmalen(sg, sg_len, cfg->src_info.data_width,
2210 cfg->dst_info.data_width);
2211 if (desc->lli_len < 0) {
2212 chan_err(chan, "Unaligned size\n");
Rabin Vincentdbd88782011-01-25 11:18:19 +01002213 goto err;
Rabin Vincent5f811582011-01-25 11:18:18 +01002214 }
2215
Rabin Vincentdbd88782011-01-25 11:18:19 +01002216 ret = d40_pool_lli_alloc(chan, desc, desc->lli_len);
2217 if (ret < 0) {
2218 chan_err(chan, "Could not allocate lli\n");
2219 goto err;
2220 }
2221
Rabin Vincent5f811582011-01-25 11:18:18 +01002222 desc->lli_current = 0;
2223 desc->txd.flags = dma_flags;
2224 desc->txd.tx_submit = d40_tx_submit;
2225
2226 dma_async_tx_descriptor_init(&desc->txd, &chan->chan);
2227
2228 return desc;
Rabin Vincentdbd88782011-01-25 11:18:19 +01002229
2230err:
2231 d40_desc_free(chan, desc);
2232 return NULL;
Rabin Vincent5f811582011-01-25 11:18:18 +01002233}
2234
Rabin Vincentcade1d32011-01-25 11:18:23 +01002235static struct dma_async_tx_descriptor *
2236d40_prep_sg(struct dma_chan *dchan, struct scatterlist *sg_src,
2237 struct scatterlist *sg_dst, unsigned int sg_len,
Vinod Kouldb8196d2011-10-13 22:34:23 +05302238 enum dma_transfer_direction direction, unsigned long dma_flags)
Rabin Vincentcade1d32011-01-25 11:18:23 +01002239{
2240 struct d40_chan *chan = container_of(dchan, struct d40_chan, chan);
Rabin Vincent822c5672011-01-25 11:18:28 +01002241 dma_addr_t src_dev_addr = 0;
2242 dma_addr_t dst_dev_addr = 0;
Rabin Vincentcade1d32011-01-25 11:18:23 +01002243 struct d40_desc *desc;
2244 unsigned long flags;
2245 int ret;
2246
2247 if (!chan->phy_chan) {
2248 chan_err(chan, "Cannot prepare unallocated channel\n");
2249 return NULL;
Jonas Aaberg0d0f6b82010-06-20 21:25:31 +00002250 }
2251
Rabin Vincentcade1d32011-01-25 11:18:23 +01002252 spin_lock_irqsave(&chan->lock, flags);
Linus Walleij8d318a52010-03-30 15:33:42 +02002253
Rabin Vincentcade1d32011-01-25 11:18:23 +01002254 desc = d40_prep_desc(chan, sg_src, sg_len, dma_flags);
2255 if (desc == NULL)
Linus Walleij8d318a52010-03-30 15:33:42 +02002256 goto err;
2257
Rabin Vincent0c842b52011-01-25 11:18:35 +01002258 if (sg_next(&sg_src[sg_len - 1]) == sg_src)
2259 desc->cyclic = true;
2260
Lee Jonesef9c89b32013-05-15 10:51:30 +01002261 if (direction == DMA_DEV_TO_MEM)
2262 src_dev_addr = chan->runtime_addr;
2263 else if (direction == DMA_MEM_TO_DEV)
2264 dst_dev_addr = chan->runtime_addr;
Rabin Vincentcade1d32011-01-25 11:18:23 +01002265
2266 if (chan_is_logical(chan))
2267 ret = d40_prep_sg_log(chan, desc, sg_src, sg_dst,
Rabin Vincent822c5672011-01-25 11:18:28 +01002268 sg_len, src_dev_addr, dst_dev_addr);
Rabin Vincentcade1d32011-01-25 11:18:23 +01002269 else
2270 ret = d40_prep_sg_phy(chan, desc, sg_src, sg_dst,
Rabin Vincent822c5672011-01-25 11:18:28 +01002271 sg_len, src_dev_addr, dst_dev_addr);
Rabin Vincentcade1d32011-01-25 11:18:23 +01002272
2273 if (ret) {
2274 chan_err(chan, "Failed to prepare %s sg job: %d\n",
2275 chan_is_logical(chan) ? "log" : "phy", ret);
2276 goto err;
Linus Walleij8d318a52010-03-30 15:33:42 +02002277 }
2278
Per Forlin82babbb362011-08-29 13:33:35 +02002279 /*
2280 * add descriptor to the prepare queue in order to be able
2281 * to free them later in terminate_all
2282 */
2283 list_add_tail(&desc->node, &chan->prepare_queue);
2284
Rabin Vincentcade1d32011-01-25 11:18:23 +01002285 spin_unlock_irqrestore(&chan->lock, flags);
Linus Walleij8d318a52010-03-30 15:33:42 +02002286
Rabin Vincentcade1d32011-01-25 11:18:23 +01002287 return &desc->txd;
2288
Linus Walleij8d318a52010-03-30 15:33:42 +02002289err:
Rabin Vincentcade1d32011-01-25 11:18:23 +01002290 if (desc)
2291 d40_desc_free(chan, desc);
2292 spin_unlock_irqrestore(&chan->lock, flags);
Linus Walleij8d318a52010-03-30 15:33:42 +02002293 return NULL;
2294}
Linus Walleij8d318a52010-03-30 15:33:42 +02002295
2296bool stedma40_filter(struct dma_chan *chan, void *data)
2297{
2298 struct stedma40_chan_cfg *info = data;
2299 struct d40_chan *d40c =
2300 container_of(chan, struct d40_chan, chan);
2301 int err;
2302
2303 if (data) {
2304 err = d40_validate_conf(d40c, info);
2305 if (!err)
2306 d40c->dma_cfg = *info;
2307 } else
2308 err = d40_config_memcpy(d40c);
2309
Rabin Vincentce2ca122010-10-12 13:00:49 +00002310 if (!err)
2311 d40c->configured = true;
2312
Linus Walleij8d318a52010-03-30 15:33:42 +02002313 return err == 0;
2314}
2315EXPORT_SYMBOL(stedma40_filter);
2316
Rabin Vincentac2c0a32011-01-25 11:18:11 +01002317static void __d40_set_prio_rt(struct d40_chan *d40c, int dev_type, bool src)
2318{
2319 bool realtime = d40c->dma_cfg.realtime;
2320 bool highprio = d40c->dma_cfg.high_priority;
Tong Liu3cb645d2012-09-26 10:07:30 +00002321 u32 rtreg;
Rabin Vincentac2c0a32011-01-25 11:18:11 +01002322 u32 event = D40_TYPE_TO_EVENT(dev_type);
2323 u32 group = D40_TYPE_TO_GROUP(dev_type);
Lee Jones8a3b6e12013-05-15 10:51:52 +01002324 u32 bit = BIT(event);
Rabin Vincentccc3d692012-05-17 13:47:38 +05302325 u32 prioreg;
Tong Liu3cb645d2012-09-26 10:07:30 +00002326 struct d40_gen_dmac *dmac = &d40c->base->gen_dmac;
Rabin Vincentccc3d692012-05-17 13:47:38 +05302327
Tong Liu3cb645d2012-09-26 10:07:30 +00002328 rtreg = realtime ? dmac->realtime_en : dmac->realtime_clear;
Rabin Vincentccc3d692012-05-17 13:47:38 +05302329 /*
2330 * Due to a hardware bug, in some cases a logical channel triggered by
2331 * a high priority destination event line can generate extra packet
2332 * transactions.
2333 *
2334 * The workaround is to not set the high priority level for the
2335 * destination event lines that trigger logical channels.
2336 */
2337 if (!src && chan_is_logical(d40c))
2338 highprio = false;
2339
Tong Liu3cb645d2012-09-26 10:07:30 +00002340 prioreg = highprio ? dmac->high_prio_en : dmac->high_prio_clear;
Rabin Vincentac2c0a32011-01-25 11:18:11 +01002341
2342 /* Destination event lines are stored in the upper halfword */
2343 if (!src)
2344 bit <<= 16;
2345
2346 writel(bit, d40c->base->virtbase + prioreg + group * 4);
2347 writel(bit, d40c->base->virtbase + rtreg + group * 4);
2348}
2349
2350static void d40_set_prio_realtime(struct d40_chan *d40c)
2351{
2352 if (d40c->base->rev < 3)
2353 return;
2354
Lee Jones2c2b62d2013-05-15 10:51:54 +01002355 if ((d40c->dma_cfg.dir == DMA_DEV_TO_MEM) ||
2356 (d40c->dma_cfg.dir == DMA_DEV_TO_DEV))
Lee Jones26955c07d2013-05-03 15:31:56 +01002357 __d40_set_prio_rt(d40c, d40c->dma_cfg.dev_type, true);
Rabin Vincentac2c0a32011-01-25 11:18:11 +01002358
Lee Jones2c2b62d2013-05-15 10:51:54 +01002359 if ((d40c->dma_cfg.dir == DMA_MEM_TO_DEV) ||
2360 (d40c->dma_cfg.dir == DMA_DEV_TO_DEV))
Lee Jones26955c07d2013-05-03 15:31:56 +01002361 __d40_set_prio_rt(d40c, d40c->dma_cfg.dev_type, false);
Rabin Vincentac2c0a32011-01-25 11:18:11 +01002362}
2363
Lee Jonesfa332de2013-05-03 15:32:12 +01002364#define D40_DT_FLAGS_MODE(flags) ((flags >> 0) & 0x1)
2365#define D40_DT_FLAGS_DIR(flags) ((flags >> 1) & 0x1)
2366#define D40_DT_FLAGS_BIG_ENDIAN(flags) ((flags >> 2) & 0x1)
2367#define D40_DT_FLAGS_FIXED_CHAN(flags) ((flags >> 3) & 0x1)
Lee Jonesbddd5a22013-11-19 11:07:41 +00002368#define D40_DT_FLAGS_HIGH_PRIO(flags) ((flags >> 4) & 0x1)
Lee Jonesfa332de2013-05-03 15:32:12 +01002369
2370static struct dma_chan *d40_xlate(struct of_phandle_args *dma_spec,
2371 struct of_dma *ofdma)
2372{
2373 struct stedma40_chan_cfg cfg;
2374 dma_cap_mask_t cap;
2375 u32 flags;
2376
2377 memset(&cfg, 0, sizeof(struct stedma40_chan_cfg));
2378
2379 dma_cap_zero(cap);
2380 dma_cap_set(DMA_SLAVE, cap);
2381
2382 cfg.dev_type = dma_spec->args[0];
2383 flags = dma_spec->args[2];
2384
2385 switch (D40_DT_FLAGS_MODE(flags)) {
2386 case 0: cfg.mode = STEDMA40_MODE_LOGICAL; break;
2387 case 1: cfg.mode = STEDMA40_MODE_PHYSICAL; break;
2388 }
2389
2390 switch (D40_DT_FLAGS_DIR(flags)) {
2391 case 0:
Lee Jones2c2b62d2013-05-15 10:51:54 +01002392 cfg.dir = DMA_MEM_TO_DEV;
Lee Jonesfa332de2013-05-03 15:32:12 +01002393 cfg.dst_info.big_endian = D40_DT_FLAGS_BIG_ENDIAN(flags);
2394 break;
2395 case 1:
Lee Jones2c2b62d2013-05-15 10:51:54 +01002396 cfg.dir = DMA_DEV_TO_MEM;
Lee Jonesfa332de2013-05-03 15:32:12 +01002397 cfg.src_info.big_endian = D40_DT_FLAGS_BIG_ENDIAN(flags);
2398 break;
2399 }
2400
2401 if (D40_DT_FLAGS_FIXED_CHAN(flags)) {
2402 cfg.phy_channel = dma_spec->args[1];
2403 cfg.use_fixed_channel = true;
2404 }
2405
Lee Jonesbddd5a22013-11-19 11:07:41 +00002406 if (D40_DT_FLAGS_HIGH_PRIO(flags))
2407 cfg.high_priority = true;
2408
Lee Jonesfa332de2013-05-03 15:32:12 +01002409 return dma_request_channel(cap, stedma40_filter, &cfg);
2410}
2411
Linus Walleij8d318a52010-03-30 15:33:42 +02002412/* DMA ENGINE functions */
2413static int d40_alloc_chan_resources(struct dma_chan *chan)
2414{
2415 int err;
2416 unsigned long flags;
2417 struct d40_chan *d40c =
2418 container_of(chan, struct d40_chan, chan);
Linus Walleijef1872e2010-06-20 21:24:52 +00002419 bool is_free_phy;
Linus Walleij8d318a52010-03-30 15:33:42 +02002420 spin_lock_irqsave(&d40c->lock, flags);
2421
Russell King - ARM Linuxd3ee98cdc2012-03-06 22:35:47 +00002422 dma_cookie_init(chan);
Linus Walleij8d318a52010-03-30 15:33:42 +02002423
Rabin Vincentce2ca122010-10-12 13:00:49 +00002424 /* If no dma configuration is set use default configuration (memcpy) */
2425 if (!d40c->configured) {
Linus Walleij8d318a52010-03-30 15:33:42 +02002426 err = d40_config_memcpy(d40c);
Jonas Aabergff0b12b2010-06-20 21:25:15 +00002427 if (err) {
Rabin Vincent6db5a8b2011-01-25 11:18:09 +01002428 chan_err(d40c, "Failed to configure memcpy channel\n");
Markus Elfring8452b852016-09-17 15:15:15 +02002429 goto mark_last_busy;
Jonas Aabergff0b12b2010-06-20 21:25:15 +00002430 }
Linus Walleij8d318a52010-03-30 15:33:42 +02002431 }
2432
Narayanan G5cd326f2011-11-30 19:20:42 +05302433 err = d40_allocate_channel(d40c, &is_free_phy);
Linus Walleij8d318a52010-03-30 15:33:42 +02002434 if (err) {
Rabin Vincent6db5a8b2011-01-25 11:18:09 +01002435 chan_err(d40c, "Failed to allocate channel\n");
Narayanan G7fb3e752011-11-17 17:26:41 +05302436 d40c->configured = false;
Markus Elfring8452b852016-09-17 15:15:15 +02002437 goto mark_last_busy;
Linus Walleij8d318a52010-03-30 15:33:42 +02002438 }
2439
Narayanan G7fb3e752011-11-17 17:26:41 +05302440 pm_runtime_get_sync(d40c->base->dev);
Linus Walleijef1872e2010-06-20 21:24:52 +00002441
Rabin Vincentac2c0a32011-01-25 11:18:11 +01002442 d40_set_prio_realtime(d40c);
2443
Rabin Vincent724a8572011-01-25 11:18:08 +01002444 if (chan_is_logical(d40c)) {
Lee Jones2c2b62d2013-05-15 10:51:54 +01002445 if (d40c->dma_cfg.dir == DMA_DEV_TO_MEM)
Linus Walleijef1872e2010-06-20 21:24:52 +00002446 d40c->lcpa = d40c->base->lcpa_base +
Lee Jones26955c07d2013-05-03 15:31:56 +01002447 d40c->dma_cfg.dev_type * D40_LCPA_CHAN_SIZE;
Linus Walleijef1872e2010-06-20 21:24:52 +00002448 else
2449 d40c->lcpa = d40c->base->lcpa_base +
Lee Jones26955c07d2013-05-03 15:31:56 +01002450 d40c->dma_cfg.dev_type *
Fabio Baltierif26e03a2012-12-13 17:12:37 +01002451 D40_LCPA_CHAN_SIZE + D40_LCPA_CHAN_DST_DELTA;
Lee Jones97782562013-05-15 10:51:24 +01002452
2453 /* Unmask the Global Interrupt Mask. */
2454 d40c->src_def_cfg |= BIT(D40_SREG_CFG_LOG_GIM_POS);
2455 d40c->dst_def_cfg |= BIT(D40_SREG_CFG_LOG_GIM_POS);
Linus Walleijef1872e2010-06-20 21:24:52 +00002456 }
2457
Narayanan G5cd326f2011-11-30 19:20:42 +05302458 dev_dbg(chan2dev(d40c), "allocated %s channel (phy %d%s)\n",
2459 chan_is_logical(d40c) ? "logical" : "physical",
2460 d40c->phy_chan->num,
2461 d40c->dma_cfg.use_fixed_channel ? ", fixed" : "");
2462
2463
Linus Walleijef1872e2010-06-20 21:24:52 +00002464 /*
2465 * Only write channel configuration to the DMA if the physical
2466 * resource is free. In case of multiple logical channels
2467 * on the same physical resource, only the first write is necessary.
2468 */
Jonas Aabergb55912c2010-08-09 12:08:02 +00002469 if (is_free_phy)
2470 d40_config_write(d40c);
Markus Elfring8452b852016-09-17 15:15:15 +02002471 mark_last_busy:
Narayanan G7fb3e752011-11-17 17:26:41 +05302472 pm_runtime_mark_last_busy(d40c->base->dev);
2473 pm_runtime_put_autosuspend(d40c->base->dev);
Linus Walleij8d318a52010-03-30 15:33:42 +02002474 spin_unlock_irqrestore(&d40c->lock, flags);
Jonas Aabergff0b12b2010-06-20 21:25:15 +00002475 return err;
Linus Walleij8d318a52010-03-30 15:33:42 +02002476}
2477
2478static void d40_free_chan_resources(struct dma_chan *chan)
2479{
2480 struct d40_chan *d40c =
2481 container_of(chan, struct d40_chan, chan);
2482 int err;
2483 unsigned long flags;
2484
Jonas Aaberg0d0f6b82010-06-20 21:25:31 +00002485 if (d40c->phy_chan == NULL) {
Rabin Vincent6db5a8b2011-01-25 11:18:09 +01002486 chan_err(d40c, "Cannot free unallocated channel\n");
Jonas Aaberg0d0f6b82010-06-20 21:25:31 +00002487 return;
2488 }
2489
Linus Walleij8d318a52010-03-30 15:33:42 +02002490 spin_lock_irqsave(&d40c->lock, flags);
2491
2492 err = d40_free_dma(d40c);
2493
2494 if (err)
Rabin Vincent6db5a8b2011-01-25 11:18:09 +01002495 chan_err(d40c, "Failed to free channel\n");
Linus Walleij8d318a52010-03-30 15:33:42 +02002496 spin_unlock_irqrestore(&d40c->lock, flags);
2497}
2498
2499static struct dma_async_tx_descriptor *d40_prep_memcpy(struct dma_chan *chan,
2500 dma_addr_t dst,
2501 dma_addr_t src,
2502 size_t size,
Jonas Aaberg2a614342010-06-20 21:25:24 +00002503 unsigned long dma_flags)
Linus Walleij8d318a52010-03-30 15:33:42 +02002504{
Rabin Vincent95944c62011-01-25 11:18:17 +01002505 struct scatterlist dst_sg;
2506 struct scatterlist src_sg;
Linus Walleij8d318a52010-03-30 15:33:42 +02002507
Rabin Vincent95944c62011-01-25 11:18:17 +01002508 sg_init_table(&dst_sg, 1);
2509 sg_init_table(&src_sg, 1);
Jonas Aaberg0d0f6b82010-06-20 21:25:31 +00002510
Rabin Vincent95944c62011-01-25 11:18:17 +01002511 sg_dma_address(&dst_sg) = dst;
2512 sg_dma_address(&src_sg) = src;
Linus Walleij8d318a52010-03-30 15:33:42 +02002513
Rabin Vincent95944c62011-01-25 11:18:17 +01002514 sg_dma_len(&dst_sg) = size;
2515 sg_dma_len(&src_sg) = size;
Linus Walleij8d318a52010-03-30 15:33:42 +02002516
Stefan Agnerde6b6412015-03-22 00:51:08 +01002517 return d40_prep_sg(chan, &src_sg, &dst_sg, 1,
2518 DMA_MEM_TO_MEM, dma_flags);
Linus Walleij8d318a52010-03-30 15:33:42 +02002519}
2520
Ira Snyder0d688662010-09-30 11:46:47 +00002521static struct dma_async_tx_descriptor *
Rabin Vincentcade1d32011-01-25 11:18:23 +01002522d40_prep_memcpy_sg(struct dma_chan *chan,
2523 struct scatterlist *dst_sg, unsigned int dst_nents,
2524 struct scatterlist *src_sg, unsigned int src_nents,
2525 unsigned long dma_flags)
Ira Snyder0d688662010-09-30 11:46:47 +00002526{
2527 if (dst_nents != src_nents)
2528 return NULL;
2529
Stefan Agnerde6b6412015-03-22 00:51:08 +01002530 return d40_prep_sg(chan, src_sg, dst_sg, src_nents,
2531 DMA_MEM_TO_MEM, dma_flags);
Rabin Vincent00ac0342011-01-25 11:18:20 +01002532}
2533
Fabio Baltierif26e03a2012-12-13 17:12:37 +01002534static struct dma_async_tx_descriptor *
2535d40_prep_slave_sg(struct dma_chan *chan, struct scatterlist *sgl,
2536 unsigned int sg_len, enum dma_transfer_direction direction,
2537 unsigned long dma_flags, void *context)
Linus Walleij8d318a52010-03-30 15:33:42 +02002538{
Andy Shevchenkoa725dcc2013-01-10 10:53:01 +02002539 if (!is_slave_direction(direction))
Rabin Vincent00ac0342011-01-25 11:18:20 +01002540 return NULL;
2541
Rabin Vincentcade1d32011-01-25 11:18:23 +01002542 return d40_prep_sg(chan, sgl, sgl, sg_len, direction, dma_flags);
Linus Walleij8d318a52010-03-30 15:33:42 +02002543}
2544
Rabin Vincent0c842b52011-01-25 11:18:35 +01002545static struct dma_async_tx_descriptor *
2546dma40_prep_dma_cyclic(struct dma_chan *chan, dma_addr_t dma_addr,
2547 size_t buf_len, size_t period_len,
Laurent Pinchart31c1e5a2014-08-01 12:20:10 +02002548 enum dma_transfer_direction direction, unsigned long flags)
Rabin Vincent0c842b52011-01-25 11:18:35 +01002549{
2550 unsigned int periods = buf_len / period_len;
2551 struct dma_async_tx_descriptor *txd;
2552 struct scatterlist *sg;
2553 int i;
2554
Robert Marklund79ca7ec2011-06-27 11:33:24 +02002555 sg = kcalloc(periods + 1, sizeof(struct scatterlist), GFP_NOWAIT);
Sachin Kamat2ec7e2e2013-09-02 13:44:59 +05302556 if (!sg)
2557 return NULL;
2558
Rabin Vincent0c842b52011-01-25 11:18:35 +01002559 for (i = 0; i < periods; i++) {
2560 sg_dma_address(&sg[i]) = dma_addr;
2561 sg_dma_len(&sg[i]) = period_len;
2562 dma_addr += period_len;
2563 }
2564
2565 sg[periods].offset = 0;
Lars-Peter Clausenfdaf9c42012-04-25 20:50:52 +02002566 sg_dma_len(&sg[periods]) = 0;
Rabin Vincent0c842b52011-01-25 11:18:35 +01002567 sg[periods].page_link =
2568 ((unsigned long)sg | 0x01) & ~0x02;
2569
2570 txd = d40_prep_sg(chan, sg, sg, periods, direction,
2571 DMA_PREP_INTERRUPT);
2572
2573 kfree(sg);
2574
2575 return txd;
2576}
2577
Linus Walleij8d318a52010-03-30 15:33:42 +02002578static enum dma_status d40_tx_status(struct dma_chan *chan,
2579 dma_cookie_t cookie,
2580 struct dma_tx_state *txstate)
2581{
2582 struct d40_chan *d40c = container_of(chan, struct d40_chan, chan);
Russell King - ARM Linux96a2af42012-03-06 22:35:27 +00002583 enum dma_status ret;
Linus Walleij8d318a52010-03-30 15:33:42 +02002584
Jonas Aaberg0d0f6b82010-06-20 21:25:31 +00002585 if (d40c->phy_chan == NULL) {
Rabin Vincent6db5a8b2011-01-25 11:18:09 +01002586 chan_err(d40c, "Cannot read status of unallocated channel\n");
Jonas Aaberg0d0f6b82010-06-20 21:25:31 +00002587 return -EINVAL;
2588 }
2589
Russell King - ARM Linux96a2af42012-03-06 22:35:27 +00002590 ret = dma_cookie_status(chan, cookie, txstate);
Peter Griffina90e56e2016-06-07 18:38:38 +01002591 if (ret != DMA_COMPLETE && txstate)
Russell King - ARM Linux96a2af42012-03-06 22:35:27 +00002592 dma_set_residue(txstate, stedma40_residue(chan));
Linus Walleij8d318a52010-03-30 15:33:42 +02002593
Jonas Aaberga5ebca42010-05-18 00:41:09 +02002594 if (d40_is_paused(d40c))
2595 ret = DMA_PAUSED;
Linus Walleij8d318a52010-03-30 15:33:42 +02002596
2597 return ret;
2598}
2599
2600static void d40_issue_pending(struct dma_chan *chan)
2601{
2602 struct d40_chan *d40c = container_of(chan, struct d40_chan, chan);
2603 unsigned long flags;
2604
Jonas Aaberg0d0f6b82010-06-20 21:25:31 +00002605 if (d40c->phy_chan == NULL) {
Rabin Vincent6db5a8b2011-01-25 11:18:09 +01002606 chan_err(d40c, "Channel is not allocated!\n");
Jonas Aaberg0d0f6b82010-06-20 21:25:31 +00002607 return;
2608 }
2609
Linus Walleij8d318a52010-03-30 15:33:42 +02002610 spin_lock_irqsave(&d40c->lock, flags);
2611
Per Forlina8f30672011-06-26 23:29:52 +02002612 list_splice_tail_init(&d40c->pending_queue, &d40c->queue);
2613
2614 /* Busy means that queued jobs are already being processed */
Linus Walleij8d318a52010-03-30 15:33:42 +02002615 if (!d40c->busy)
2616 (void) d40_queue_start(d40c);
2617
2618 spin_unlock_irqrestore(&d40c->lock, flags);
2619}
2620
Vinod Koul35e639d2014-12-08 11:27:08 +05302621static int d40_terminate_all(struct dma_chan *chan)
Narayanan G1bdae6f2012-02-09 12:41:37 +05302622{
2623 unsigned long flags;
2624 struct d40_chan *d40c = container_of(chan, struct d40_chan, chan);
2625 int ret;
2626
Maxime Ripard6f5bad02014-11-17 14:42:36 +01002627 if (d40c->phy_chan == NULL) {
2628 chan_err(d40c, "Channel is not allocated!\n");
2629 return -EINVAL;
2630 }
2631
Narayanan G1bdae6f2012-02-09 12:41:37 +05302632 spin_lock_irqsave(&d40c->lock, flags);
2633
2634 pm_runtime_get_sync(d40c->base->dev);
2635 ret = d40_channel_execute_command(d40c, D40_DMA_STOP);
2636 if (ret)
2637 chan_err(d40c, "Failed to stop channel\n");
2638
2639 d40_term_all(d40c);
2640 pm_runtime_mark_last_busy(d40c->base->dev);
2641 pm_runtime_put_autosuspend(d40c->base->dev);
2642 if (d40c->busy) {
2643 pm_runtime_mark_last_busy(d40c->base->dev);
2644 pm_runtime_put_autosuspend(d40c->base->dev);
2645 }
2646 d40c->busy = false;
2647
2648 spin_unlock_irqrestore(&d40c->lock, flags);
Vinod Koul35e639d2014-12-08 11:27:08 +05302649 return 0;
Narayanan G1bdae6f2012-02-09 12:41:37 +05302650}
2651
Rabin Vincent98ca5282011-06-27 11:33:38 +02002652static int
2653dma40_config_to_halfchannel(struct d40_chan *d40c,
2654 struct stedma40_half_channel_info *info,
Rabin Vincent98ca5282011-06-27 11:33:38 +02002655 u32 maxburst)
2656{
Rabin Vincent98ca5282011-06-27 11:33:38 +02002657 int psize;
2658
Rabin Vincent98ca5282011-06-27 11:33:38 +02002659 if (chan_is_logical(d40c)) {
2660 if (maxburst >= 16)
2661 psize = STEDMA40_PSIZE_LOG_16;
2662 else if (maxburst >= 8)
2663 psize = STEDMA40_PSIZE_LOG_8;
2664 else if (maxburst >= 4)
2665 psize = STEDMA40_PSIZE_LOG_4;
2666 else
2667 psize = STEDMA40_PSIZE_LOG_1;
2668 } else {
2669 if (maxburst >= 16)
2670 psize = STEDMA40_PSIZE_PHY_16;
2671 else if (maxburst >= 8)
2672 psize = STEDMA40_PSIZE_PHY_8;
2673 else if (maxburst >= 4)
2674 psize = STEDMA40_PSIZE_PHY_4;
2675 else
2676 psize = STEDMA40_PSIZE_PHY_1;
2677 }
2678
Rabin Vincent98ca5282011-06-27 11:33:38 +02002679 info->psize = psize;
2680 info->flow_ctrl = STEDMA40_NO_FLOW_CTRL;
2681
2682 return 0;
2683}
2684
Linus Walleij95e14002010-08-04 13:37:45 +02002685/* Runtime reconfiguration extension */
Rabin Vincent98ca5282011-06-27 11:33:38 +02002686static int d40_set_runtime_config(struct dma_chan *chan,
2687 struct dma_slave_config *config)
Linus Walleij95e14002010-08-04 13:37:45 +02002688{
2689 struct d40_chan *d40c = container_of(chan, struct d40_chan, chan);
2690 struct stedma40_chan_cfg *cfg = &d40c->dma_cfg;
Rabin Vincent98ca5282011-06-27 11:33:38 +02002691 enum dma_slave_buswidth src_addr_width, dst_addr_width;
Linus Walleij95e14002010-08-04 13:37:45 +02002692 dma_addr_t config_addr;
Rabin Vincent98ca5282011-06-27 11:33:38 +02002693 u32 src_maxburst, dst_maxburst;
2694 int ret;
2695
Maxime Ripard6f5bad02014-11-17 14:42:36 +01002696 if (d40c->phy_chan == NULL) {
2697 chan_err(d40c, "Channel is not allocated!\n");
2698 return -EINVAL;
2699 }
2700
Rabin Vincent98ca5282011-06-27 11:33:38 +02002701 src_addr_width = config->src_addr_width;
2702 src_maxburst = config->src_maxburst;
2703 dst_addr_width = config->dst_addr_width;
2704 dst_maxburst = config->dst_maxburst;
Linus Walleij95e14002010-08-04 13:37:45 +02002705
Vinod Kouldb8196d2011-10-13 22:34:23 +05302706 if (config->direction == DMA_DEV_TO_MEM) {
Linus Walleij95e14002010-08-04 13:37:45 +02002707 config_addr = config->src_addr;
Lee Jonesef9c89b32013-05-15 10:51:30 +01002708
Lee Jones2c2b62d2013-05-15 10:51:54 +01002709 if (cfg->dir != DMA_DEV_TO_MEM)
Linus Walleij95e14002010-08-04 13:37:45 +02002710 dev_dbg(d40c->base->dev,
2711 "channel was not configured for peripheral "
2712 "to memory transfer (%d) overriding\n",
2713 cfg->dir);
Lee Jones2c2b62d2013-05-15 10:51:54 +01002714 cfg->dir = DMA_DEV_TO_MEM;
Linus Walleij95e14002010-08-04 13:37:45 +02002715
Rabin Vincent98ca5282011-06-27 11:33:38 +02002716 /* Configure the memory side */
2717 if (dst_addr_width == DMA_SLAVE_BUSWIDTH_UNDEFINED)
2718 dst_addr_width = src_addr_width;
2719 if (dst_maxburst == 0)
2720 dst_maxburst = src_maxburst;
Linus Walleij95e14002010-08-04 13:37:45 +02002721
Vinod Kouldb8196d2011-10-13 22:34:23 +05302722 } else if (config->direction == DMA_MEM_TO_DEV) {
Linus Walleij95e14002010-08-04 13:37:45 +02002723 config_addr = config->dst_addr;
Lee Jonesef9c89b32013-05-15 10:51:30 +01002724
Lee Jones2c2b62d2013-05-15 10:51:54 +01002725 if (cfg->dir != DMA_MEM_TO_DEV)
Linus Walleij95e14002010-08-04 13:37:45 +02002726 dev_dbg(d40c->base->dev,
2727 "channel was not configured for memory "
2728 "to peripheral transfer (%d) overriding\n",
2729 cfg->dir);
Lee Jones2c2b62d2013-05-15 10:51:54 +01002730 cfg->dir = DMA_MEM_TO_DEV;
Linus Walleij95e14002010-08-04 13:37:45 +02002731
Rabin Vincent98ca5282011-06-27 11:33:38 +02002732 /* Configure the memory side */
2733 if (src_addr_width == DMA_SLAVE_BUSWIDTH_UNDEFINED)
2734 src_addr_width = dst_addr_width;
2735 if (src_maxburst == 0)
2736 src_maxburst = dst_maxburst;
Linus Walleij95e14002010-08-04 13:37:45 +02002737 } else {
2738 dev_err(d40c->base->dev,
2739 "unrecognized channel direction %d\n",
2740 config->direction);
Rabin Vincent98ca5282011-06-27 11:33:38 +02002741 return -EINVAL;
Linus Walleij95e14002010-08-04 13:37:45 +02002742 }
2743
Lee Jonesef9c89b32013-05-15 10:51:30 +01002744 if (config_addr <= 0) {
2745 dev_err(d40c->base->dev, "no address supplied\n");
2746 return -EINVAL;
2747 }
2748
Rabin Vincent98ca5282011-06-27 11:33:38 +02002749 if (src_maxburst * src_addr_width != dst_maxburst * dst_addr_width) {
Linus Walleij95e14002010-08-04 13:37:45 +02002750 dev_err(d40c->base->dev,
Rabin Vincent98ca5282011-06-27 11:33:38 +02002751 "src/dst width/maxburst mismatch: %d*%d != %d*%d\n",
2752 src_maxburst,
2753 src_addr_width,
2754 dst_maxburst,
2755 dst_addr_width);
2756 return -EINVAL;
Linus Walleij95e14002010-08-04 13:37:45 +02002757 }
2758
Per Forlin92bb6cd2011-10-13 12:11:36 +02002759 if (src_maxburst > 16) {
2760 src_maxburst = 16;
2761 dst_maxburst = src_maxburst * src_addr_width / dst_addr_width;
2762 } else if (dst_maxburst > 16) {
2763 dst_maxburst = 16;
2764 src_maxburst = dst_maxburst * dst_addr_width / src_addr_width;
2765 }
2766
Lee Jones43f2e1a2013-05-15 11:51:57 +02002767 /* Only valid widths are; 1, 2, 4 and 8. */
2768 if (src_addr_width <= DMA_SLAVE_BUSWIDTH_UNDEFINED ||
2769 src_addr_width > DMA_SLAVE_BUSWIDTH_8_BYTES ||
2770 dst_addr_width <= DMA_SLAVE_BUSWIDTH_UNDEFINED ||
2771 dst_addr_width > DMA_SLAVE_BUSWIDTH_8_BYTES ||
Guennadi Liakhovetskic95905a2013-09-18 09:33:08 +02002772 !is_power_of_2(src_addr_width) ||
2773 !is_power_of_2(dst_addr_width))
Lee Jones43f2e1a2013-05-15 11:51:57 +02002774 return -EINVAL;
2775
2776 cfg->src_info.data_width = src_addr_width;
2777 cfg->dst_info.data_width = dst_addr_width;
2778
Rabin Vincent98ca5282011-06-27 11:33:38 +02002779 ret = dma40_config_to_halfchannel(d40c, &cfg->src_info,
Rabin Vincent98ca5282011-06-27 11:33:38 +02002780 src_maxburst);
2781 if (ret)
2782 return ret;
Linus Walleij95e14002010-08-04 13:37:45 +02002783
Rabin Vincent98ca5282011-06-27 11:33:38 +02002784 ret = dma40_config_to_halfchannel(d40c, &cfg->dst_info,
Rabin Vincent98ca5282011-06-27 11:33:38 +02002785 dst_maxburst);
2786 if (ret)
2787 return ret;
Linus Walleij95e14002010-08-04 13:37:45 +02002788
Per Forlina59670a2010-10-06 09:05:27 +00002789 /* Fill in register values */
Rabin Vincent724a8572011-01-25 11:18:08 +01002790 if (chan_is_logical(d40c))
Per Forlina59670a2010-10-06 09:05:27 +00002791 d40_log_cfg(cfg, &d40c->log_def.lcsp1, &d40c->log_def.lcsp3);
2792 else
Lee Jones57e65ad2013-05-15 10:51:25 +01002793 d40_phy_cfg(cfg, &d40c->src_def_cfg, &d40c->dst_def_cfg);
Per Forlina59670a2010-10-06 09:05:27 +00002794
Linus Walleij95e14002010-08-04 13:37:45 +02002795 /* These settings will take precedence later */
2796 d40c->runtime_addr = config_addr;
2797 d40c->runtime_direction = config->direction;
2798 dev_dbg(d40c->base->dev,
Rabin Vincent98ca5282011-06-27 11:33:38 +02002799 "configured channel %s for %s, data width %d/%d, "
2800 "maxburst %d/%d elements, LE, no flow control\n",
Linus Walleij95e14002010-08-04 13:37:45 +02002801 dma_chan_name(chan),
Vinod Kouldb8196d2011-10-13 22:34:23 +05302802 (config->direction == DMA_DEV_TO_MEM) ? "RX" : "TX",
Rabin Vincent98ca5282011-06-27 11:33:38 +02002803 src_addr_width, dst_addr_width,
2804 src_maxburst, dst_maxburst);
2805
2806 return 0;
Linus Walleij95e14002010-08-04 13:37:45 +02002807}
2808
Linus Walleij8d318a52010-03-30 15:33:42 +02002809/* Initialization functions */
2810
2811static void __init d40_chan_init(struct d40_base *base, struct dma_device *dma,
2812 struct d40_chan *chans, int offset,
2813 int num_chans)
2814{
2815 int i = 0;
2816 struct d40_chan *d40c;
2817
2818 INIT_LIST_HEAD(&dma->channels);
2819
2820 for (i = offset; i < offset + num_chans; i++) {
2821 d40c = &chans[i];
2822 d40c->base = base;
2823 d40c->chan.device = dma;
2824
Linus Walleij8d318a52010-03-30 15:33:42 +02002825 spin_lock_init(&d40c->lock);
2826
2827 d40c->log_num = D40_PHY_CHAN;
2828
Fabio Baltieri4226dd82012-12-13 13:46:16 +01002829 INIT_LIST_HEAD(&d40c->done);
Linus Walleij8d318a52010-03-30 15:33:42 +02002830 INIT_LIST_HEAD(&d40c->active);
2831 INIT_LIST_HEAD(&d40c->queue);
Per Forlina8f30672011-06-26 23:29:52 +02002832 INIT_LIST_HEAD(&d40c->pending_queue);
Linus Walleij8d318a52010-03-30 15:33:42 +02002833 INIT_LIST_HEAD(&d40c->client);
Per Forlin82babbb362011-08-29 13:33:35 +02002834 INIT_LIST_HEAD(&d40c->prepare_queue);
Linus Walleij8d318a52010-03-30 15:33:42 +02002835
Linus Walleij8d318a52010-03-30 15:33:42 +02002836 tasklet_init(&d40c->tasklet, dma_tasklet,
2837 (unsigned long) d40c);
2838
2839 list_add_tail(&d40c->chan.device_node,
2840 &dma->channels);
2841 }
2842}
2843
Rabin Vincent7ad74a72011-01-25 11:18:33 +01002844static void d40_ops_init(struct d40_base *base, struct dma_device *dev)
2845{
2846 if (dma_has_cap(DMA_SLAVE, dev->cap_mask))
2847 dev->device_prep_slave_sg = d40_prep_slave_sg;
2848
2849 if (dma_has_cap(DMA_MEMCPY, dev->cap_mask)) {
2850 dev->device_prep_dma_memcpy = d40_prep_memcpy;
2851
2852 /*
2853 * This controller can only access address at even
2854 * 32bit boundaries, i.e. 2^2
2855 */
Maxime Ripard77a68e52015-07-20 10:41:32 +02002856 dev->copy_align = DMAENGINE_ALIGN_4_BYTES;
Rabin Vincent7ad74a72011-01-25 11:18:33 +01002857 }
2858
2859 if (dma_has_cap(DMA_SG, dev->cap_mask))
2860 dev->device_prep_dma_sg = d40_prep_memcpy_sg;
2861
Rabin Vincent0c842b52011-01-25 11:18:35 +01002862 if (dma_has_cap(DMA_CYCLIC, dev->cap_mask))
2863 dev->device_prep_dma_cyclic = dma40_prep_dma_cyclic;
2864
Rabin Vincent7ad74a72011-01-25 11:18:33 +01002865 dev->device_alloc_chan_resources = d40_alloc_chan_resources;
2866 dev->device_free_chan_resources = d40_free_chan_resources;
2867 dev->device_issue_pending = d40_issue_pending;
2868 dev->device_tx_status = d40_tx_status;
Maxime Ripard6f5bad02014-11-17 14:42:36 +01002869 dev->device_config = d40_set_runtime_config;
2870 dev->device_pause = d40_pause;
2871 dev->device_resume = d40_resume;
2872 dev->device_terminate_all = d40_terminate_all;
Rabin Vincent7ad74a72011-01-25 11:18:33 +01002873 dev->dev = base->dev;
2874}
2875
Linus Walleij8d318a52010-03-30 15:33:42 +02002876static int __init d40_dmaengine_init(struct d40_base *base,
2877 int num_reserved_chans)
2878{
2879 int err ;
2880
2881 d40_chan_init(base, &base->dma_slave, base->log_chans,
2882 0, base->num_log_chans);
2883
2884 dma_cap_zero(base->dma_slave.cap_mask);
2885 dma_cap_set(DMA_SLAVE, base->dma_slave.cap_mask);
Rabin Vincent0c842b52011-01-25 11:18:35 +01002886 dma_cap_set(DMA_CYCLIC, base->dma_slave.cap_mask);
Linus Walleij8d318a52010-03-30 15:33:42 +02002887
Rabin Vincent7ad74a72011-01-25 11:18:33 +01002888 d40_ops_init(base, &base->dma_slave);
Linus Walleij8d318a52010-03-30 15:33:42 +02002889
2890 err = dma_async_device_register(&base->dma_slave);
2891
2892 if (err) {
Rabin Vincent6db5a8b2011-01-25 11:18:09 +01002893 d40_err(base->dev, "Failed to register slave channels\n");
Markus Elfringc9909932016-09-17 15:10:15 +02002894 goto exit;
Linus Walleij8d318a52010-03-30 15:33:42 +02002895 }
2896
2897 d40_chan_init(base, &base->dma_memcpy, base->log_chans,
Lee Jonesa7dacb62013-05-15 10:51:59 +01002898 base->num_log_chans, base->num_memcpy_chans);
Linus Walleij8d318a52010-03-30 15:33:42 +02002899
2900 dma_cap_zero(base->dma_memcpy.cap_mask);
2901 dma_cap_set(DMA_MEMCPY, base->dma_memcpy.cap_mask);
Rabin Vincent7ad74a72011-01-25 11:18:33 +01002902 dma_cap_set(DMA_SG, base->dma_memcpy.cap_mask);
Linus Walleij8d318a52010-03-30 15:33:42 +02002903
Rabin Vincent7ad74a72011-01-25 11:18:33 +01002904 d40_ops_init(base, &base->dma_memcpy);
Linus Walleij8d318a52010-03-30 15:33:42 +02002905
2906 err = dma_async_device_register(&base->dma_memcpy);
2907
2908 if (err) {
Rabin Vincent6db5a8b2011-01-25 11:18:09 +01002909 d40_err(base->dev,
Geliang Tang52984aa2015-10-18 23:31:10 +08002910 "Failed to register memcpy only channels\n");
Markus Elfringc9909932016-09-17 15:10:15 +02002911 goto unregister_slave;
Linus Walleij8d318a52010-03-30 15:33:42 +02002912 }
2913
2914 d40_chan_init(base, &base->dma_both, base->phy_chans,
2915 0, num_reserved_chans);
2916
2917 dma_cap_zero(base->dma_both.cap_mask);
2918 dma_cap_set(DMA_SLAVE, base->dma_both.cap_mask);
2919 dma_cap_set(DMA_MEMCPY, base->dma_both.cap_mask);
Rabin Vincent7ad74a72011-01-25 11:18:33 +01002920 dma_cap_set(DMA_SG, base->dma_both.cap_mask);
Rabin Vincent0c842b52011-01-25 11:18:35 +01002921 dma_cap_set(DMA_CYCLIC, base->dma_slave.cap_mask);
Linus Walleij8d318a52010-03-30 15:33:42 +02002922
Rabin Vincent7ad74a72011-01-25 11:18:33 +01002923 d40_ops_init(base, &base->dma_both);
Linus Walleij8d318a52010-03-30 15:33:42 +02002924 err = dma_async_device_register(&base->dma_both);
2925
2926 if (err) {
Rabin Vincent6db5a8b2011-01-25 11:18:09 +01002927 d40_err(base->dev,
2928 "Failed to register logical and physical capable channels\n");
Markus Elfringc9909932016-09-17 15:10:15 +02002929 goto unregister_memcpy;
Linus Walleij8d318a52010-03-30 15:33:42 +02002930 }
2931 return 0;
Markus Elfringc9909932016-09-17 15:10:15 +02002932 unregister_memcpy:
Linus Walleij8d318a52010-03-30 15:33:42 +02002933 dma_async_device_unregister(&base->dma_memcpy);
Markus Elfringc9909932016-09-17 15:10:15 +02002934 unregister_slave:
Linus Walleij8d318a52010-03-30 15:33:42 +02002935 dma_async_device_unregister(&base->dma_slave);
Markus Elfringc9909932016-09-17 15:10:15 +02002936 exit:
Linus Walleij8d318a52010-03-30 15:33:42 +02002937 return err;
2938}
2939
Narayanan G7fb3e752011-11-17 17:26:41 +05302940/* Suspend resume functionality */
Ulf Hansson123e4ca2014-04-23 21:52:03 +02002941#ifdef CONFIG_PM_SLEEP
2942static int dma40_suspend(struct device *dev)
Narayanan G7fb3e752011-11-17 17:26:41 +05302943{
Narayanan G28c7a192011-11-22 13:56:55 +05302944 struct platform_device *pdev = to_platform_device(dev);
2945 struct d40_base *base = platform_get_drvdata(pdev);
Ulf Hanssonc906a3e2014-04-23 21:52:04 +02002946 int ret;
2947
2948 ret = pm_runtime_force_suspend(dev);
2949 if (ret)
2950 return ret;
Narayanan G7fb3e752011-11-17 17:26:41 +05302951
Narayanan G28c7a192011-11-22 13:56:55 +05302952 if (base->lcpa_regulator)
2953 ret = regulator_disable(base->lcpa_regulator);
2954 return ret;
Narayanan G7fb3e752011-11-17 17:26:41 +05302955}
2956
Ulf Hansson123e4ca2014-04-23 21:52:03 +02002957static int dma40_resume(struct device *dev)
2958{
2959 struct platform_device *pdev = to_platform_device(dev);
2960 struct d40_base *base = platform_get_drvdata(pdev);
2961 int ret = 0;
2962
Ulf Hanssonc906a3e2014-04-23 21:52:04 +02002963 if (base->lcpa_regulator) {
Ulf Hansson123e4ca2014-04-23 21:52:03 +02002964 ret = regulator_enable(base->lcpa_regulator);
Ulf Hanssonc906a3e2014-04-23 21:52:04 +02002965 if (ret)
2966 return ret;
2967 }
Ulf Hansson123e4ca2014-04-23 21:52:03 +02002968
Ulf Hanssonc906a3e2014-04-23 21:52:04 +02002969 return pm_runtime_force_resume(dev);
Ulf Hansson123e4ca2014-04-23 21:52:03 +02002970}
2971#endif
2972
2973#ifdef CONFIG_PM
2974static void dma40_backup(void __iomem *baseaddr, u32 *backup,
2975 u32 *regaddr, int num, bool save)
2976{
2977 int i;
2978
2979 for (i = 0; i < num; i++) {
2980 void __iomem *addr = baseaddr + regaddr[i];
2981
2982 if (save)
2983 backup[i] = readl_relaxed(addr);
2984 else
2985 writel_relaxed(backup[i], addr);
2986 }
2987}
2988
2989static void d40_save_restore_registers(struct d40_base *base, bool save)
2990{
2991 int i;
2992
2993 /* Save/Restore channel specific registers */
2994 for (i = 0; i < base->num_phy_chans; i++) {
2995 void __iomem *addr;
2996 int idx;
2997
2998 if (base->phy_res[i].reserved)
2999 continue;
3000
3001 addr = base->virtbase + D40_DREG_PCBASE + i * D40_DREG_PCDELTA;
3002 idx = i * ARRAY_SIZE(d40_backup_regs_chan);
3003
3004 dma40_backup(addr, &base->reg_val_backup_chan[idx],
3005 d40_backup_regs_chan,
3006 ARRAY_SIZE(d40_backup_regs_chan),
3007 save);
3008 }
3009
3010 /* Save/Restore global registers */
3011 dma40_backup(base->virtbase, base->reg_val_backup,
3012 d40_backup_regs, ARRAY_SIZE(d40_backup_regs),
3013 save);
3014
3015 /* Save/Restore registers only existing on dma40 v3 and later */
3016 if (base->gen_dmac.backup)
3017 dma40_backup(base->virtbase, base->reg_val_backup_v4,
3018 base->gen_dmac.backup,
3019 base->gen_dmac.backup_size,
3020 save);
3021}
3022
Narayanan G7fb3e752011-11-17 17:26:41 +05303023static int dma40_runtime_suspend(struct device *dev)
3024{
3025 struct platform_device *pdev = to_platform_device(dev);
3026 struct d40_base *base = platform_get_drvdata(pdev);
3027
3028 d40_save_restore_registers(base, true);
3029
3030 /* Don't disable/enable clocks for v1 due to HW bugs */
3031 if (base->rev != 1)
3032 writel_relaxed(base->gcc_pwr_off_mask,
3033 base->virtbase + D40_DREG_GCC);
3034
3035 return 0;
3036}
3037
3038static int dma40_runtime_resume(struct device *dev)
3039{
3040 struct platform_device *pdev = to_platform_device(dev);
3041 struct d40_base *base = platform_get_drvdata(pdev);
3042
Ulf Hansson2dafca12014-04-23 21:52:02 +02003043 d40_save_restore_registers(base, false);
Narayanan G7fb3e752011-11-17 17:26:41 +05303044
3045 writel_relaxed(D40_DREG_GCC_ENABLE_ALL,
3046 base->virtbase + D40_DREG_GCC);
3047 return 0;
3048}
Ulf Hansson123e4ca2014-04-23 21:52:03 +02003049#endif
Narayanan G7fb3e752011-11-17 17:26:41 +05303050
3051static const struct dev_pm_ops dma40_pm_ops = {
Ulf Hansson673d3772014-05-07 11:03:57 +02003052 SET_LATE_SYSTEM_SLEEP_PM_OPS(dma40_suspend, dma40_resume)
Rafael J. Wysocki6ed23b82014-12-04 00:34:11 +01003053 SET_RUNTIME_PM_OPS(dma40_runtime_suspend,
Ulf Hansson123e4ca2014-04-23 21:52:03 +02003054 dma40_runtime_resume,
3055 NULL)
Narayanan G7fb3e752011-11-17 17:26:41 +05303056};
Narayanan G7fb3e752011-11-17 17:26:41 +05303057
Linus Walleij8d318a52010-03-30 15:33:42 +02003058/* Initialization functions. */
3059
3060static int __init d40_phy_res_init(struct d40_base *base)
3061{
3062 int i;
3063 int num_phy_chans_avail = 0;
3064 u32 val[2];
3065 int odd_even_bit = -2;
Narayanan G7fb3e752011-11-17 17:26:41 +05303066 int gcc = D40_DREG_GCC_ENA;
Linus Walleij8d318a52010-03-30 15:33:42 +02003067
3068 val[0] = readl(base->virtbase + D40_DREG_PRSME);
3069 val[1] = readl(base->virtbase + D40_DREG_PRSMO);
3070
3071 for (i = 0; i < base->num_phy_chans; i++) {
3072 base->phy_res[i].num = i;
3073 odd_even_bit += 2 * ((i % 2) == 0);
3074 if (((val[i % 2] >> odd_even_bit) & 3) == 1) {
3075 /* Mark security only channels as occupied */
3076 base->phy_res[i].allocated_src = D40_ALLOC_PHY;
3077 base->phy_res[i].allocated_dst = D40_ALLOC_PHY;
Narayanan G7fb3e752011-11-17 17:26:41 +05303078 base->phy_res[i].reserved = true;
3079 gcc |= D40_DREG_GCC_EVTGRP_ENA(D40_PHYS_TO_GROUP(i),
3080 D40_DREG_GCC_SRC);
3081 gcc |= D40_DREG_GCC_EVTGRP_ENA(D40_PHYS_TO_GROUP(i),
3082 D40_DREG_GCC_DST);
3083
3084
Linus Walleij8d318a52010-03-30 15:33:42 +02003085 } else {
3086 base->phy_res[i].allocated_src = D40_ALLOC_FREE;
3087 base->phy_res[i].allocated_dst = D40_ALLOC_FREE;
Narayanan G7fb3e752011-11-17 17:26:41 +05303088 base->phy_res[i].reserved = false;
Linus Walleij8d318a52010-03-30 15:33:42 +02003089 num_phy_chans_avail++;
3090 }
3091 spin_lock_init(&base->phy_res[i].lock);
3092 }
Jonas Aaberg6b7acd82010-06-20 21:26:59 +00003093
3094 /* Mark disabled channels as occupied */
3095 for (i = 0; base->plat_data->disabled_channels[i] != -1; i++) {
Rabin Vincentf57b4072010-10-06 08:20:35 +00003096 int chan = base->plat_data->disabled_channels[i];
3097
3098 base->phy_res[chan].allocated_src = D40_ALLOC_PHY;
3099 base->phy_res[chan].allocated_dst = D40_ALLOC_PHY;
Narayanan G7fb3e752011-11-17 17:26:41 +05303100 base->phy_res[chan].reserved = true;
3101 gcc |= D40_DREG_GCC_EVTGRP_ENA(D40_PHYS_TO_GROUP(chan),
3102 D40_DREG_GCC_SRC);
3103 gcc |= D40_DREG_GCC_EVTGRP_ENA(D40_PHYS_TO_GROUP(chan),
3104 D40_DREG_GCC_DST);
Rabin Vincentf57b4072010-10-06 08:20:35 +00003105 num_phy_chans_avail--;
Jonas Aaberg6b7acd82010-06-20 21:26:59 +00003106 }
3107
Fabio Baltieri74070482012-12-18 12:25:14 +01003108 /* Mark soft_lli channels */
3109 for (i = 0; i < base->plat_data->num_of_soft_lli_chans; i++) {
3110 int chan = base->plat_data->soft_lli_chans[i];
3111
3112 base->phy_res[chan].use_soft_lli = true;
3113 }
3114
Linus Walleij8d318a52010-03-30 15:33:42 +02003115 dev_info(base->dev, "%d of %d physical DMA channels available\n",
3116 num_phy_chans_avail, base->num_phy_chans);
3117
3118 /* Verify settings extended vs standard */
3119 val[0] = readl(base->virtbase + D40_DREG_PRTYP);
3120
3121 for (i = 0; i < base->num_phy_chans; i++) {
3122
3123 if (base->phy_res[i].allocated_src == D40_ALLOC_FREE &&
3124 (val[0] & 0x3) != 1)
3125 dev_info(base->dev,
3126 "[%s] INFO: channel %d is misconfigured (%d)\n",
3127 __func__, i, val[0] & 0x3);
3128
3129 val[0] = val[0] >> 2;
3130 }
3131
Narayanan G7fb3e752011-11-17 17:26:41 +05303132 /*
3133 * To keep things simple, Enable all clocks initially.
3134 * The clocks will get managed later post channel allocation.
3135 * The clocks for the event lines on which reserved channels exists
3136 * are not managed here.
3137 */
3138 writel(D40_DREG_GCC_ENABLE_ALL, base->virtbase + D40_DREG_GCC);
3139 base->gcc_pwr_off_mask = gcc;
3140
Linus Walleij8d318a52010-03-30 15:33:42 +02003141 return num_phy_chans_avail;
3142}
3143
3144static struct d40_base * __init d40_hw_detect_init(struct platform_device *pdev)
3145{
Jingoo Hand4adcc02013-07-30 17:09:11 +09003146 struct stedma40_platform_data *plat_data = dev_get_platdata(&pdev->dev);
Markus Elfring11f7a8d2016-09-17 14:34:18 +02003147 struct clk *clk;
3148 void __iomem *virtbase;
3149 struct resource *res;
3150 struct d40_base *base;
3151 int num_log_chans;
Linus Walleij8d318a52010-03-30 15:33:42 +02003152 int num_phy_chans;
Lee Jonesa7dacb62013-05-15 10:51:59 +01003153 int num_memcpy_chans;
Ulf Hanssonb707c6582012-08-23 13:41:58 +02003154 int clk_ret = -EINVAL;
Linus Walleij8d318a52010-03-30 15:33:42 +02003155 int i;
Linus Walleijf4b89762011-06-27 11:33:46 +02003156 u32 pid;
3157 u32 cid;
3158 u8 rev;
Linus Walleij8d318a52010-03-30 15:33:42 +02003159
3160 clk = clk_get(&pdev->dev, NULL);
Linus Walleij8d318a52010-03-30 15:33:42 +02003161 if (IS_ERR(clk)) {
Rabin Vincent6db5a8b2011-01-25 11:18:09 +01003162 d40_err(&pdev->dev, "No matching clock found\n");
Markus Elfringf4534ad2016-09-17 14:10:47 +02003163 goto check_prepare_enabled;
Linus Walleij8d318a52010-03-30 15:33:42 +02003164 }
3165
Ulf Hanssonb707c6582012-08-23 13:41:58 +02003166 clk_ret = clk_prepare_enable(clk);
3167 if (clk_ret) {
3168 d40_err(&pdev->dev, "Failed to prepare/enable clock\n");
Markus Elfringf4534ad2016-09-17 14:10:47 +02003169 goto disable_unprepare;
Ulf Hanssonb707c6582012-08-23 13:41:58 +02003170 }
Linus Walleij8d318a52010-03-30 15:33:42 +02003171
3172 /* Get IO for DMAC base address */
3173 res = platform_get_resource_byname(pdev, IORESOURCE_MEM, "base");
3174 if (!res)
Markus Elfringf4534ad2016-09-17 14:10:47 +02003175 goto disable_unprepare;
Linus Walleij8d318a52010-03-30 15:33:42 +02003176
3177 if (request_mem_region(res->start, resource_size(res),
3178 D40_NAME " I/O base") == NULL)
Markus Elfringf4534ad2016-09-17 14:10:47 +02003179 goto release_region;
Linus Walleij8d318a52010-03-30 15:33:42 +02003180
3181 virtbase = ioremap(res->start, resource_size(res));
3182 if (!virtbase)
Markus Elfringf4534ad2016-09-17 14:10:47 +02003183 goto release_region;
Linus Walleij8d318a52010-03-30 15:33:42 +02003184
Linus Walleijf4b89762011-06-27 11:33:46 +02003185 /* This is just a regular AMBA PrimeCell ID actually */
3186 for (pid = 0, i = 0; i < 4; i++)
3187 pid |= (readl(virtbase + resource_size(res) - 0x20 + 4 * i)
3188 & 255) << (i * 8);
3189 for (cid = 0, i = 0; i < 4; i++)
3190 cid |= (readl(virtbase + resource_size(res) - 0x10 + 4 * i)
3191 & 255) << (i * 8);
Linus Walleij8d318a52010-03-30 15:33:42 +02003192
Linus Walleijf4b89762011-06-27 11:33:46 +02003193 if (cid != AMBA_CID) {
3194 d40_err(&pdev->dev, "Unknown hardware! No PrimeCell ID\n");
Markus Elfringf4534ad2016-09-17 14:10:47 +02003195 goto unmap_io;
Linus Walleij8d318a52010-03-30 15:33:42 +02003196 }
Linus Walleijf4b89762011-06-27 11:33:46 +02003197 if (AMBA_MANF_BITS(pid) != AMBA_VENDOR_ST) {
3198 d40_err(&pdev->dev, "Unknown designer! Got %x wanted %x\n",
3199 AMBA_MANF_BITS(pid),
3200 AMBA_VENDOR_ST);
Markus Elfringf4534ad2016-09-17 14:10:47 +02003201 goto unmap_io;
Linus Walleijf4b89762011-06-27 11:33:46 +02003202 }
3203 /*
3204 * HW revision:
3205 * DB8500ed has revision 0
3206 * ? has revision 1
3207 * DB8500v1 has revision 2
3208 * DB8500v2 has revision 3
Gerald Baeza47db92f2012-09-21 21:21:37 +02003209 * AP9540v1 has revision 4
3210 * DB8540v1 has revision 4
Linus Walleijf4b89762011-06-27 11:33:46 +02003211 */
3212 rev = AMBA_REV_BITS(pid);
Lee Jones8b2fe9b2013-05-03 15:32:08 +01003213 if (rev < 2) {
3214 d40_err(&pdev->dev, "hardware revision: %d is not supported", rev);
Markus Elfringf4534ad2016-09-17 14:10:47 +02003215 goto unmap_io;
Lee Jones8b2fe9b2013-05-03 15:32:08 +01003216 }
Jonas Aaberg3ae02672010-08-09 12:08:18 +00003217
Gerald Baeza47db92f2012-09-21 21:21:37 +02003218 /* The number of physical channels on this HW */
3219 if (plat_data->num_of_phy_chans)
3220 num_phy_chans = plat_data->num_of_phy_chans;
3221 else
3222 num_phy_chans = 4 * (readl(virtbase + D40_DREG_ICFG) & 0x7) + 4;
3223
Lee Jonesa7dacb62013-05-15 10:51:59 +01003224 /* The number of channels used for memcpy */
3225 if (plat_data->num_of_memcpy_chans)
3226 num_memcpy_chans = plat_data->num_of_memcpy_chans;
3227 else
3228 num_memcpy_chans = ARRAY_SIZE(dma40_memcpy_channels);
3229
Lee Jonesdb72da92013-05-03 15:32:03 +01003230 num_log_chans = num_phy_chans * D40_MAX_LOG_CHAN_PER_PHY;
3231
Lee Jonesb2abb242013-05-03 15:32:09 +01003232 dev_info(&pdev->dev,
Fabio Estevam3a919d52013-08-21 21:34:02 -03003233 "hardware rev: %d @ %pa with %d physical and %d logical channels\n",
3234 rev, &res->start, num_phy_chans, num_log_chans);
Linus Walleij8d318a52010-03-30 15:33:42 +02003235
Linus Walleij8d318a52010-03-30 15:33:42 +02003236 base = kzalloc(ALIGN(sizeof(struct d40_base), 4) +
Lee Jonesa7dacb62013-05-15 10:51:59 +01003237 (num_phy_chans + num_log_chans + num_memcpy_chans) *
Linus Walleij8d318a52010-03-30 15:33:42 +02003238 sizeof(struct d40_chan), GFP_KERNEL);
3239
Peter Griffinaef94fe2016-06-07 18:38:41 +01003240 if (base == NULL)
Markus Elfringf4534ad2016-09-17 14:10:47 +02003241 goto unmap_io;
Linus Walleij8d318a52010-03-30 15:33:42 +02003242
Jonas Aaberg3ae02672010-08-09 12:08:18 +00003243 base->rev = rev;
Linus Walleij8d318a52010-03-30 15:33:42 +02003244 base->clk = clk;
Lee Jonesa7dacb62013-05-15 10:51:59 +01003245 base->num_memcpy_chans = num_memcpy_chans;
Linus Walleij8d318a52010-03-30 15:33:42 +02003246 base->num_phy_chans = num_phy_chans;
3247 base->num_log_chans = num_log_chans;
3248 base->phy_start = res->start;
3249 base->phy_size = resource_size(res);
3250 base->virtbase = virtbase;
3251 base->plat_data = plat_data;
3252 base->dev = &pdev->dev;
3253 base->phy_chans = ((void *)base) + ALIGN(sizeof(struct d40_base), 4);
3254 base->log_chans = &base->phy_chans[num_phy_chans];
3255
Tong Liu3cb645d2012-09-26 10:07:30 +00003256 if (base->plat_data->num_of_phy_chans == 14) {
3257 base->gen_dmac.backup = d40_backup_regs_v4b;
3258 base->gen_dmac.backup_size = BACKUP_REGS_SZ_V4B;
3259 base->gen_dmac.interrupt_en = D40_DREG_CPCMIS;
3260 base->gen_dmac.interrupt_clear = D40_DREG_CPCICR;
3261 base->gen_dmac.realtime_en = D40_DREG_CRSEG1;
3262 base->gen_dmac.realtime_clear = D40_DREG_CRCEG1;
3263 base->gen_dmac.high_prio_en = D40_DREG_CPSEG1;
3264 base->gen_dmac.high_prio_clear = D40_DREG_CPCEG1;
3265 base->gen_dmac.il = il_v4b;
3266 base->gen_dmac.il_size = ARRAY_SIZE(il_v4b);
3267 base->gen_dmac.init_reg = dma_init_reg_v4b;
3268 base->gen_dmac.init_reg_size = ARRAY_SIZE(dma_init_reg_v4b);
3269 } else {
3270 if (base->rev >= 3) {
3271 base->gen_dmac.backup = d40_backup_regs_v4a;
3272 base->gen_dmac.backup_size = BACKUP_REGS_SZ_V4A;
3273 }
3274 base->gen_dmac.interrupt_en = D40_DREG_PCMIS;
3275 base->gen_dmac.interrupt_clear = D40_DREG_PCICR;
3276 base->gen_dmac.realtime_en = D40_DREG_RSEG1;
3277 base->gen_dmac.realtime_clear = D40_DREG_RCEG1;
3278 base->gen_dmac.high_prio_en = D40_DREG_PSEG1;
3279 base->gen_dmac.high_prio_clear = D40_DREG_PCEG1;
3280 base->gen_dmac.il = il_v4a;
3281 base->gen_dmac.il_size = ARRAY_SIZE(il_v4a);
3282 base->gen_dmac.init_reg = dma_init_reg_v4a;
3283 base->gen_dmac.init_reg_size = ARRAY_SIZE(dma_init_reg_v4a);
3284 }
3285
Markus Elfringe349d4b2016-09-17 09:56:32 +02003286 base->phy_res = kcalloc(num_phy_chans,
3287 sizeof(*base->phy_res),
Linus Walleij8d318a52010-03-30 15:33:42 +02003288 GFP_KERNEL);
3289 if (!base->phy_res)
Markus Elfringf4534ad2016-09-17 14:10:47 +02003290 goto free_base;
Linus Walleij8d318a52010-03-30 15:33:42 +02003291
Markus Elfringe349d4b2016-09-17 09:56:32 +02003292 base->lookup_phy_chans = kcalloc(num_phy_chans,
3293 sizeof(*base->lookup_phy_chans),
Linus Walleij8d318a52010-03-30 15:33:42 +02003294 GFP_KERNEL);
3295 if (!base->lookup_phy_chans)
Markus Elfringf4534ad2016-09-17 14:10:47 +02003296 goto free_phy_res;
Linus Walleij8d318a52010-03-30 15:33:42 +02003297
Markus Elfringe349d4b2016-09-17 09:56:32 +02003298 base->lookup_log_chans = kcalloc(num_log_chans,
3299 sizeof(*base->lookup_log_chans),
Lee Jones8a59fed2013-05-03 15:32:04 +01003300 GFP_KERNEL);
3301 if (!base->lookup_log_chans)
Markus Elfringf4534ad2016-09-17 14:10:47 +02003302 goto free_phy_chans;
Jonas Aaberg698e4732010-08-09 12:08:56 +00003303
Markus Elfring28c01052016-09-17 11:44:55 +02003304 base->reg_val_backup_chan = kmalloc_array(base->num_phy_chans,
3305 sizeof(d40_backup_regs_chan),
3306 GFP_KERNEL);
Narayanan G7fb3e752011-11-17 17:26:41 +05303307 if (!base->reg_val_backup_chan)
Markus Elfringf4534ad2016-09-17 14:10:47 +02003308 goto free_log_chans;
Narayanan G7fb3e752011-11-17 17:26:41 +05303309
Markus Elfringe349d4b2016-09-17 09:56:32 +02003310 base->lcla_pool.alloc_map = kcalloc(num_phy_chans
3311 * D40_LCLA_LINK_PER_EVENT_GRP,
3312 sizeof(*base->lcla_pool.alloc_map),
3313 GFP_KERNEL);
Linus Walleij8d318a52010-03-30 15:33:42 +02003314 if (!base->lcla_pool.alloc_map)
Markus Elfringf4534ad2016-09-17 14:10:47 +02003315 goto free_backup_chan;
Linus Walleij8d318a52010-03-30 15:33:42 +02003316
Jonas Aabergc675b1b2010-06-20 21:25:08 +00003317 base->desc_slab = kmem_cache_create(D40_NAME, sizeof(struct d40_desc),
3318 0, SLAB_HWCACHE_ALIGN,
3319 NULL);
3320 if (base->desc_slab == NULL)
Markus Elfringf4534ad2016-09-17 14:10:47 +02003321 goto free_map;
Jonas Aabergc675b1b2010-06-20 21:25:08 +00003322
Linus Walleij8d318a52010-03-30 15:33:42 +02003323 return base;
Markus Elfringf4534ad2016-09-17 14:10:47 +02003324 free_map:
3325 kfree(base->lcla_pool.alloc_map);
3326 free_backup_chan:
3327 kfree(base->reg_val_backup_chan);
3328 free_log_chans:
3329 kfree(base->lookup_log_chans);
3330 free_phy_chans:
3331 kfree(base->lookup_phy_chans);
3332 free_phy_res:
3333 kfree(base->phy_res);
3334 free_base:
3335 kfree(base);
3336 unmap_io:
3337 iounmap(virtbase);
3338 release_region:
3339 release_mem_region(res->start, resource_size(res));
3340 check_prepare_enabled:
Ulf Hanssonb707c6582012-08-23 13:41:58 +02003341 if (!clk_ret)
Markus Elfringf4534ad2016-09-17 14:10:47 +02003342 disable_unprepare:
Ulf Hanssonb707c6582012-08-23 13:41:58 +02003343 clk_disable_unprepare(clk);
3344 if (!IS_ERR(clk))
Linus Walleij8d318a52010-03-30 15:33:42 +02003345 clk_put(clk);
Linus Walleij8d318a52010-03-30 15:33:42 +02003346 return NULL;
3347}
3348
3349static void __init d40_hw_init(struct d40_base *base)
3350{
3351
Linus Walleij8d318a52010-03-30 15:33:42 +02003352 int i;
3353 u32 prmseo[2] = {0, 0};
3354 u32 activeo[2] = {0xFFFFFFFF, 0xFFFFFFFF};
3355 u32 pcmis = 0;
3356 u32 pcicr = 0;
Tong Liu3cb645d2012-09-26 10:07:30 +00003357 struct d40_reg_val *dma_init_reg = base->gen_dmac.init_reg;
3358 u32 reg_size = base->gen_dmac.init_reg_size;
Linus Walleij8d318a52010-03-30 15:33:42 +02003359
Tong Liu3cb645d2012-09-26 10:07:30 +00003360 for (i = 0; i < reg_size; i++)
Linus Walleij8d318a52010-03-30 15:33:42 +02003361 writel(dma_init_reg[i].val,
3362 base->virtbase + dma_init_reg[i].reg);
3363
3364 /* Configure all our dma channels to default settings */
3365 for (i = 0; i < base->num_phy_chans; i++) {
3366
3367 activeo[i % 2] = activeo[i % 2] << 2;
3368
3369 if (base->phy_res[base->num_phy_chans - i - 1].allocated_src
3370 == D40_ALLOC_PHY) {
3371 activeo[i % 2] |= 3;
3372 continue;
3373 }
3374
3375 /* Enable interrupt # */
3376 pcmis = (pcmis << 1) | 1;
3377
3378 /* Clear interrupt # */
3379 pcicr = (pcicr << 1) | 1;
3380
3381 /* Set channel to physical mode */
3382 prmseo[i % 2] = prmseo[i % 2] << 2;
3383 prmseo[i % 2] |= 1;
3384
3385 }
3386
3387 writel(prmseo[1], base->virtbase + D40_DREG_PRMSE);
3388 writel(prmseo[0], base->virtbase + D40_DREG_PRMSO);
3389 writel(activeo[1], base->virtbase + D40_DREG_ACTIVE);
3390 writel(activeo[0], base->virtbase + D40_DREG_ACTIVO);
3391
3392 /* Write which interrupt to enable */
Tong Liu3cb645d2012-09-26 10:07:30 +00003393 writel(pcmis, base->virtbase + base->gen_dmac.interrupt_en);
Linus Walleij8d318a52010-03-30 15:33:42 +02003394
3395 /* Write which interrupt to clear */
Tong Liu3cb645d2012-09-26 10:07:30 +00003396 writel(pcicr, base->virtbase + base->gen_dmac.interrupt_clear);
Linus Walleij8d318a52010-03-30 15:33:42 +02003397
Tong Liu3cb645d2012-09-26 10:07:30 +00003398 /* These are __initdata and cannot be accessed after init */
3399 base->gen_dmac.init_reg = NULL;
3400 base->gen_dmac.init_reg_size = 0;
Linus Walleij8d318a52010-03-30 15:33:42 +02003401}
3402
Linus Walleij508849a2010-06-20 21:26:07 +00003403static int __init d40_lcla_allocate(struct d40_base *base)
3404{
Rabin Vincent026cbc42011-01-25 11:18:14 +01003405 struct d40_lcla_pool *pool = &base->lcla_pool;
Linus Walleij508849a2010-06-20 21:26:07 +00003406 unsigned long *page_list;
3407 int i, j;
Markus Elfringabac5ba2016-09-17 08:24:46 +02003408 int ret;
Linus Walleij508849a2010-06-20 21:26:07 +00003409
3410 /*
3411 * This is somewhat ugly. We need 8192 bytes that are 18 bit aligned,
3412 * To full fill this hardware requirement without wasting 256 kb
3413 * we allocate pages until we get an aligned one.
3414 */
Markus Elfringcf80ecf2016-09-16 17:56:07 +02003415 page_list = kmalloc_array(MAX_LCLA_ALLOC_ATTEMPTS,
3416 sizeof(*page_list),
3417 GFP_KERNEL);
Markus Elfring2c7f2f22016-09-17 08:21:30 +02003418 if (!page_list)
3419 return -ENOMEM;
Linus Walleij508849a2010-06-20 21:26:07 +00003420
3421 /* Calculating how many pages that are required */
3422 base->lcla_pool.pages = SZ_1K * base->num_phy_chans / PAGE_SIZE;
3423
3424 for (i = 0; i < MAX_LCLA_ALLOC_ATTEMPTS; i++) {
3425 page_list[i] = __get_free_pages(GFP_KERNEL,
3426 base->lcla_pool.pages);
3427 if (!page_list[i]) {
3428
Rabin Vincent6db5a8b2011-01-25 11:18:09 +01003429 d40_err(base->dev, "Failed to allocate %d pages.\n",
3430 base->lcla_pool.pages);
Julia Lawall39375332014-11-22 15:39:19 +01003431 ret = -ENOMEM;
Linus Walleij508849a2010-06-20 21:26:07 +00003432
3433 for (j = 0; j < i; j++)
3434 free_pages(page_list[j], base->lcla_pool.pages);
Markus Elfringaae32ec2016-09-17 08:23:37 +02003435 goto free_page_list;
Linus Walleij508849a2010-06-20 21:26:07 +00003436 }
3437
3438 if ((virt_to_phys((void *)page_list[i]) &
3439 (LCLA_ALIGNMENT - 1)) == 0)
3440 break;
3441 }
3442
3443 for (j = 0; j < i; j++)
3444 free_pages(page_list[j], base->lcla_pool.pages);
3445
3446 if (i < MAX_LCLA_ALLOC_ATTEMPTS) {
3447 base->lcla_pool.base = (void *)page_list[i];
3448 } else {
Jonas Aaberg767a9672010-08-09 12:08:34 +00003449 /*
3450 * After many attempts and no succees with finding the correct
3451 * alignment, try with allocating a big buffer.
3452 */
Linus Walleij508849a2010-06-20 21:26:07 +00003453 dev_warn(base->dev,
3454 "[%s] Failed to get %d pages @ 18 bit align.\n",
3455 __func__, base->lcla_pool.pages);
3456 base->lcla_pool.base_unaligned = kmalloc(SZ_1K *
3457 base->num_phy_chans +
3458 LCLA_ALIGNMENT,
3459 GFP_KERNEL);
3460 if (!base->lcla_pool.base_unaligned) {
3461 ret = -ENOMEM;
Markus Elfringaae32ec2016-09-17 08:23:37 +02003462 goto free_page_list;
Linus Walleij508849a2010-06-20 21:26:07 +00003463 }
3464
3465 base->lcla_pool.base = PTR_ALIGN(base->lcla_pool.base_unaligned,
3466 LCLA_ALIGNMENT);
3467 }
3468
Rabin Vincent026cbc42011-01-25 11:18:14 +01003469 pool->dma_addr = dma_map_single(base->dev, pool->base,
3470 SZ_1K * base->num_phy_chans,
3471 DMA_TO_DEVICE);
3472 if (dma_mapping_error(base->dev, pool->dma_addr)) {
3473 pool->dma_addr = 0;
3474 ret = -ENOMEM;
Markus Elfringaae32ec2016-09-17 08:23:37 +02003475 goto free_page_list;
Rabin Vincent026cbc42011-01-25 11:18:14 +01003476 }
3477
Linus Walleij508849a2010-06-20 21:26:07 +00003478 writel(virt_to_phys(base->lcla_pool.base),
3479 base->virtbase + D40_DREG_LCLA);
Markus Elfringabac5ba2016-09-17 08:24:46 +02003480 ret = 0;
Markus Elfringaae32ec2016-09-17 08:23:37 +02003481 free_page_list:
Linus Walleij508849a2010-06-20 21:26:07 +00003482 kfree(page_list);
3483 return ret;
3484}
3485
Lee Jones1814a172013-05-03 15:32:11 +01003486static int __init d40_of_probe(struct platform_device *pdev,
3487 struct device_node *np)
3488{
3489 struct stedma40_platform_data *pdata;
Lee Jones499c2bc2013-05-15 10:52:02 +01003490 int num_phy = 0, num_memcpy = 0, num_disabled = 0;
Sachin Kamatcbbe13e2013-09-02 13:44:58 +05303491 const __be32 *list;
Lee Jones1814a172013-05-03 15:32:11 +01003492
Markus Elfring71660222016-09-17 08:28:05 +02003493 pdata = devm_kzalloc(&pdev->dev, sizeof(*pdata), GFP_KERNEL);
Lee Jones1814a172013-05-03 15:32:11 +01003494 if (!pdata)
3495 return -ENOMEM;
3496
Lee Jonesfd59f9e2013-05-15 10:52:01 +01003497 /* If absent this value will be obtained from h/w. */
3498 of_property_read_u32(np, "dma-channels", &num_phy);
3499 if (num_phy > 0)
3500 pdata->num_of_phy_chans = num_phy;
3501
Lee Jonesa7dacb62013-05-15 10:51:59 +01003502 list = of_get_property(np, "memcpy-channels", &num_memcpy);
3503 num_memcpy /= sizeof(*list);
3504
3505 if (num_memcpy > D40_MEMCPY_MAX_CHANS || num_memcpy <= 0) {
3506 d40_err(&pdev->dev,
3507 "Invalid number of memcpy channels specified (%d)\n",
3508 num_memcpy);
3509 return -EINVAL;
3510 }
3511 pdata->num_of_memcpy_chans = num_memcpy;
3512
3513 of_property_read_u32_array(np, "memcpy-channels",
3514 dma40_memcpy_channels,
3515 num_memcpy);
3516
Lee Jones499c2bc2013-05-15 10:52:02 +01003517 list = of_get_property(np, "disabled-channels", &num_disabled);
3518 num_disabled /= sizeof(*list);
3519
Dan Carpenter5be21902013-08-23 12:23:43 +03003520 if (num_disabled >= STEDMA40_MAX_PHYS || num_disabled < 0) {
Lee Jones499c2bc2013-05-15 10:52:02 +01003521 d40_err(&pdev->dev,
3522 "Invalid number of disabled channels specified (%d)\n",
3523 num_disabled);
3524 return -EINVAL;
3525 }
3526
3527 of_property_read_u32_array(np, "disabled-channels",
3528 pdata->disabled_channels,
3529 num_disabled);
3530 pdata->disabled_channels[num_disabled] = -1;
3531
Lee Jones1814a172013-05-03 15:32:11 +01003532 pdev->dev.platform_data = pdata;
3533
3534 return 0;
3535}
3536
Linus Walleij8d318a52010-03-30 15:33:42 +02003537static int __init d40_probe(struct platform_device *pdev)
3538{
Jingoo Hand4adcc02013-07-30 17:09:11 +09003539 struct stedma40_platform_data *plat_data = dev_get_platdata(&pdev->dev);
Lee Jones1814a172013-05-03 15:32:11 +01003540 struct device_node *np = pdev->dev.of_node;
Linus Walleij8d318a52010-03-30 15:33:42 +02003541 int ret = -ENOENT;
Markus Elfringa9bae062015-11-16 21:56:07 +01003542 struct d40_base *base;
Markus Elfringaeb89742015-11-16 22:00:28 +01003543 struct resource *res;
Linus Walleij8d318a52010-03-30 15:33:42 +02003544 int num_reserved_chans;
3545 u32 val;
3546
Lee Jones1814a172013-05-03 15:32:11 +01003547 if (!plat_data) {
3548 if (np) {
Dilek Uzulmezfe146472015-02-21 20:48:02 +02003549 if (d40_of_probe(pdev, np)) {
Lee Jones1814a172013-05-03 15:32:11 +01003550 ret = -ENOMEM;
Markus Elfringa9bae062015-11-16 21:56:07 +01003551 goto report_failure;
Lee Jones1814a172013-05-03 15:32:11 +01003552 }
3553 } else {
3554 d40_err(&pdev->dev, "No pdata or Device Tree provided\n");
Markus Elfringa9bae062015-11-16 21:56:07 +01003555 goto report_failure;
Lee Jones1814a172013-05-03 15:32:11 +01003556 }
3557 }
Linus Walleij8d318a52010-03-30 15:33:42 +02003558
Lee Jones1814a172013-05-03 15:32:11 +01003559 base = d40_hw_detect_init(pdev);
Linus Walleij8d318a52010-03-30 15:33:42 +02003560 if (!base)
Markus Elfringa9bae062015-11-16 21:56:07 +01003561 goto report_failure;
Linus Walleij8d318a52010-03-30 15:33:42 +02003562
3563 num_reserved_chans = d40_phy_res_init(base);
3564
3565 platform_set_drvdata(pdev, base);
3566
3567 spin_lock_init(&base->interrupt_lock);
3568 spin_lock_init(&base->execmd_lock);
3569
3570 /* Get IO for logical channel parameter address */
3571 res = platform_get_resource_byname(pdev, IORESOURCE_MEM, "lcpa");
3572 if (!res) {
3573 ret = -ENOENT;
Rabin Vincent6db5a8b2011-01-25 11:18:09 +01003574 d40_err(&pdev->dev, "No \"lcpa\" memory resource\n");
Markus Elfringd7b7ecc2016-09-17 14:50:53 +02003575 goto destroy_cache;
Linus Walleij8d318a52010-03-30 15:33:42 +02003576 }
3577 base->lcpa_size = resource_size(res);
3578 base->phy_lcpa = res->start;
3579
3580 if (request_mem_region(res->start, resource_size(res),
3581 D40_NAME " I/O lcpa") == NULL) {
3582 ret = -EBUSY;
Fabio Estevam3a919d52013-08-21 21:34:02 -03003583 d40_err(&pdev->dev, "Failed to request LCPA region %pR\n", res);
Markus Elfringd7b7ecc2016-09-17 14:50:53 +02003584 goto destroy_cache;
Linus Walleij8d318a52010-03-30 15:33:42 +02003585 }
3586
3587 /* We make use of ESRAM memory for this. */
3588 val = readl(base->virtbase + D40_DREG_LCPA);
3589 if (res->start != val && val != 0) {
3590 dev_warn(&pdev->dev,
Fabio Estevam3a919d52013-08-21 21:34:02 -03003591 "[%s] Mismatch LCPA dma 0x%x, def %pa\n",
3592 __func__, val, &res->start);
Linus Walleij8d318a52010-03-30 15:33:42 +02003593 } else
3594 writel(res->start, base->virtbase + D40_DREG_LCPA);
3595
3596 base->lcpa_base = ioremap(res->start, resource_size(res));
3597 if (!base->lcpa_base) {
3598 ret = -ENOMEM;
Rabin Vincent6db5a8b2011-01-25 11:18:09 +01003599 d40_err(&pdev->dev, "Failed to ioremap LCPA region\n");
Markus Elfringd7b7ecc2016-09-17 14:50:53 +02003600 goto destroy_cache;
Linus Walleij8d318a52010-03-30 15:33:42 +02003601 }
Narayanan G28c7a192011-11-22 13:56:55 +05303602 /* If lcla has to be located in ESRAM we don't need to allocate */
3603 if (base->plat_data->use_esram_lcla) {
3604 res = platform_get_resource_byname(pdev, IORESOURCE_MEM,
3605 "lcla_esram");
3606 if (!res) {
3607 ret = -ENOENT;
3608 d40_err(&pdev->dev,
3609 "No \"lcla_esram\" memory resource\n");
Markus Elfringd7b7ecc2016-09-17 14:50:53 +02003610 goto destroy_cache;
Narayanan G28c7a192011-11-22 13:56:55 +05303611 }
3612 base->lcla_pool.base = ioremap(res->start,
3613 resource_size(res));
3614 if (!base->lcla_pool.base) {
3615 ret = -ENOMEM;
3616 d40_err(&pdev->dev, "Failed to ioremap LCLA region\n");
Markus Elfringd7b7ecc2016-09-17 14:50:53 +02003617 goto destroy_cache;
Narayanan G28c7a192011-11-22 13:56:55 +05303618 }
3619 writel(res->start, base->virtbase + D40_DREG_LCLA);
Linus Walleij508849a2010-06-20 21:26:07 +00003620
Narayanan G28c7a192011-11-22 13:56:55 +05303621 } else {
3622 ret = d40_lcla_allocate(base);
3623 if (ret) {
3624 d40_err(&pdev->dev, "Failed to allocate LCLA area\n");
Markus Elfringd7b7ecc2016-09-17 14:50:53 +02003625 goto destroy_cache;
Narayanan G28c7a192011-11-22 13:56:55 +05303626 }
Linus Walleij8d318a52010-03-30 15:33:42 +02003627 }
3628
Linus Walleij8d318a52010-03-30 15:33:42 +02003629 spin_lock_init(&base->lcla_pool.lock);
3630
Linus Walleij8d318a52010-03-30 15:33:42 +02003631 base->irq = platform_get_irq(pdev, 0);
3632
3633 ret = request_irq(base->irq, d40_handle_interrupt, 0, D40_NAME, base);
Linus Walleij8d318a52010-03-30 15:33:42 +02003634 if (ret) {
Rabin Vincent6db5a8b2011-01-25 11:18:09 +01003635 d40_err(&pdev->dev, "No IRQ defined\n");
Markus Elfringd7b7ecc2016-09-17 14:50:53 +02003636 goto destroy_cache;
Linus Walleij8d318a52010-03-30 15:33:42 +02003637 }
3638
Narayanan G28c7a192011-11-22 13:56:55 +05303639 if (base->plat_data->use_esram_lcla) {
3640
3641 base->lcpa_regulator = regulator_get(base->dev, "lcla_esram");
3642 if (IS_ERR(base->lcpa_regulator)) {
3643 d40_err(&pdev->dev, "Failed to get lcpa_regulator\n");
Wei Yongjun8581bbc2013-05-31 09:50:07 +08003644 ret = PTR_ERR(base->lcpa_regulator);
Narayanan G28c7a192011-11-22 13:56:55 +05303645 base->lcpa_regulator = NULL;
Markus Elfringd7b7ecc2016-09-17 14:50:53 +02003646 goto destroy_cache;
Narayanan G28c7a192011-11-22 13:56:55 +05303647 }
3648
3649 ret = regulator_enable(base->lcpa_regulator);
3650 if (ret) {
3651 d40_err(&pdev->dev,
3652 "Failed to enable lcpa_regulator\n");
3653 regulator_put(base->lcpa_regulator);
3654 base->lcpa_regulator = NULL;
Markus Elfringd7b7ecc2016-09-17 14:50:53 +02003655 goto destroy_cache;
Narayanan G28c7a192011-11-22 13:56:55 +05303656 }
3657 }
3658
Ulf Hansson2dafca12014-04-23 21:52:02 +02003659 writel_relaxed(D40_DREG_GCC_ENABLE_ALL, base->virtbase + D40_DREG_GCC);
3660
3661 pm_runtime_irq_safe(base->dev);
3662 pm_runtime_set_autosuspend_delay(base->dev, DMA40_AUTOSUSPEND_DELAY);
3663 pm_runtime_use_autosuspend(base->dev);
3664 pm_runtime_mark_last_busy(base->dev);
3665 pm_runtime_set_active(base->dev);
3666 pm_runtime_enable(base->dev);
3667
Wei Yongjun8581bbc2013-05-31 09:50:07 +08003668 ret = d40_dmaengine_init(base, num_reserved_chans);
3669 if (ret)
Markus Elfringd7b7ecc2016-09-17 14:50:53 +02003670 goto destroy_cache;
Linus Walleij8d318a52010-03-30 15:33:42 +02003671
Per Forlinb96710e2011-10-18 18:39:47 +02003672 base->dev->dma_parms = &base->dma_parms;
Wei Yongjun8581bbc2013-05-31 09:50:07 +08003673 ret = dma_set_max_seg_size(base->dev, STEDMA40_MAX_SEG_SIZE);
3674 if (ret) {
Per Forlinb96710e2011-10-18 18:39:47 +02003675 d40_err(&pdev->dev, "Failed to set dma max seg size\n");
Markus Elfringd7b7ecc2016-09-17 14:50:53 +02003676 goto destroy_cache;
Per Forlinb96710e2011-10-18 18:39:47 +02003677 }
3678
Linus Walleij8d318a52010-03-30 15:33:42 +02003679 d40_hw_init(base);
3680
Lee Jonesfa332de2013-05-03 15:32:12 +01003681 if (np) {
Wei Yongjun8581bbc2013-05-31 09:50:07 +08003682 ret = of_dma_controller_register(np, d40_xlate, NULL);
3683 if (ret)
Lee Jonesfa332de2013-05-03 15:32:12 +01003684 dev_err(&pdev->dev,
3685 "could not register of_dma_controller\n");
3686 }
3687
Linus Walleij8d318a52010-03-30 15:33:42 +02003688 dev_info(base->dev, "initialized\n");
3689 return 0;
Markus Elfringd7b7ecc2016-09-17 14:50:53 +02003690 destroy_cache:
Markus Elfringa9bae062015-11-16 21:56:07 +01003691 kmem_cache_destroy(base->desc_slab);
3692 if (base->virtbase)
3693 iounmap(base->virtbase);
Rabin Vincent026cbc42011-01-25 11:18:14 +01003694
Markus Elfringa9bae062015-11-16 21:56:07 +01003695 if (base->lcla_pool.base && base->plat_data->use_esram_lcla) {
3696 iounmap(base->lcla_pool.base);
3697 base->lcla_pool.base = NULL;
Linus Walleij8d318a52010-03-30 15:33:42 +02003698 }
3699
Markus Elfringa9bae062015-11-16 21:56:07 +01003700 if (base->lcla_pool.dma_addr)
3701 dma_unmap_single(base->dev, base->lcla_pool.dma_addr,
3702 SZ_1K * base->num_phy_chans,
3703 DMA_TO_DEVICE);
3704
3705 if (!base->lcla_pool.base_unaligned && base->lcla_pool.base)
3706 free_pages((unsigned long)base->lcla_pool.base,
3707 base->lcla_pool.pages);
3708
3709 kfree(base->lcla_pool.base_unaligned);
3710
3711 if (base->phy_lcpa)
3712 release_mem_region(base->phy_lcpa,
3713 base->lcpa_size);
3714 if (base->phy_start)
3715 release_mem_region(base->phy_start,
3716 base->phy_size);
3717 if (base->clk) {
3718 clk_disable_unprepare(base->clk);
3719 clk_put(base->clk);
3720 }
3721
3722 if (base->lcpa_regulator) {
3723 regulator_disable(base->lcpa_regulator);
3724 regulator_put(base->lcpa_regulator);
3725 }
3726
3727 kfree(base->lcla_pool.alloc_map);
3728 kfree(base->lookup_log_chans);
3729 kfree(base->lookup_phy_chans);
3730 kfree(base->phy_res);
3731 kfree(base);
Markus Elfring876e0232016-09-17 14:36:26 +02003732 report_failure:
Rabin Vincent6db5a8b2011-01-25 11:18:09 +01003733 d40_err(&pdev->dev, "probe failed\n");
Linus Walleij8d318a52010-03-30 15:33:42 +02003734 return ret;
3735}
3736
Lee Jones1814a172013-05-03 15:32:11 +01003737static const struct of_device_id d40_match[] = {
3738 { .compatible = "stericsson,dma40", },
3739 {}
3740};
3741
Linus Walleij8d318a52010-03-30 15:33:42 +02003742static struct platform_driver d40_driver = {
3743 .driver = {
Linus Walleij8d318a52010-03-30 15:33:42 +02003744 .name = D40_NAME,
Ulf Hansson123e4ca2014-04-23 21:52:03 +02003745 .pm = &dma40_pm_ops,
Lee Jones1814a172013-05-03 15:32:11 +01003746 .of_match_table = d40_match,
Linus Walleij8d318a52010-03-30 15:33:42 +02003747 },
3748};
3749
Rabin Vincentcb9ab2d2011-01-25 11:18:04 +01003750static int __init stedma40_init(void)
Linus Walleij8d318a52010-03-30 15:33:42 +02003751{
3752 return platform_driver_probe(&d40_driver, d40_probe);
3753}
Linus Walleija0eb2212011-05-18 14:18:57 +02003754subsys_initcall(stedma40_init);