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Matt Porterc2dde5f2012-08-22 21:09:34 -04001/*
2 * TI EDMA DMA engine driver
3 *
4 * Copyright 2012 Texas Instruments
5 *
6 * This program is free software; you can redistribute it and/or
7 * modify it under the terms of the GNU General Public License as
8 * published by the Free Software Foundation version 2.
9 *
10 * This program is distributed "as is" WITHOUT ANY WARRANTY of any
11 * kind, whether express or implied; without even the implied warranty
12 * of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
13 * GNU General Public License for more details.
14 */
15
16#include <linux/dmaengine.h>
17#include <linux/dma-mapping.h>
Lad, Prabhakarb7a4fd52015-02-04 13:03:27 +000018#include <linux/edma.h>
Matt Porterc2dde5f2012-08-22 21:09:34 -040019#include <linux/err.h>
20#include <linux/init.h>
21#include <linux/interrupt.h>
22#include <linux/list.h>
23#include <linux/module.h>
24#include <linux/platform_device.h>
25#include <linux/slab.h>
26#include <linux/spinlock.h>
Peter Ujfalusied646102014-07-31 13:12:38 +030027#include <linux/of.h>
Peter Ujfalusidc9b60552015-10-14 14:42:47 +030028#include <linux/of_dma.h>
Peter Ujfalusi2b6b3b72015-10-14 14:42:53 +030029#include <linux/of_irq.h>
30#include <linux/of_address.h>
31#include <linux/of_device.h>
32#include <linux/pm_runtime.h>
Matt Porterc2dde5f2012-08-22 21:09:34 -040033
Matt Porter3ad7a422013-03-06 11:15:31 -050034#include <linux/platform_data/edma.h>
Matt Porterc2dde5f2012-08-22 21:09:34 -040035
36#include "dmaengine.h"
37#include "virt-dma.h"
38
Peter Ujfalusi2b6b3b72015-10-14 14:42:53 +030039/* Offsets matching "struct edmacc_param" */
40#define PARM_OPT 0x00
41#define PARM_SRC 0x04
42#define PARM_A_B_CNT 0x08
43#define PARM_DST 0x0c
44#define PARM_SRC_DST_BIDX 0x10
45#define PARM_LINK_BCNTRLD 0x14
46#define PARM_SRC_DST_CIDX 0x18
47#define PARM_CCNT 0x1c
48
49#define PARM_SIZE 0x20
50
51/* Offsets for EDMA CC global channel registers and their shadows */
52#define SH_ER 0x00 /* 64 bits */
53#define SH_ECR 0x08 /* 64 bits */
54#define SH_ESR 0x10 /* 64 bits */
55#define SH_CER 0x18 /* 64 bits */
56#define SH_EER 0x20 /* 64 bits */
57#define SH_EECR 0x28 /* 64 bits */
58#define SH_EESR 0x30 /* 64 bits */
59#define SH_SER 0x38 /* 64 bits */
60#define SH_SECR 0x40 /* 64 bits */
61#define SH_IER 0x50 /* 64 bits */
62#define SH_IECR 0x58 /* 64 bits */
63#define SH_IESR 0x60 /* 64 bits */
64#define SH_IPR 0x68 /* 64 bits */
65#define SH_ICR 0x70 /* 64 bits */
66#define SH_IEVAL 0x78
67#define SH_QER 0x80
68#define SH_QEER 0x84
69#define SH_QEECR 0x88
70#define SH_QEESR 0x8c
71#define SH_QSER 0x90
72#define SH_QSECR 0x94
73#define SH_SIZE 0x200
74
75/* Offsets for EDMA CC global registers */
76#define EDMA_REV 0x0000
77#define EDMA_CCCFG 0x0004
78#define EDMA_QCHMAP 0x0200 /* 8 registers */
79#define EDMA_DMAQNUM 0x0240 /* 8 registers (4 on OMAP-L1xx) */
80#define EDMA_QDMAQNUM 0x0260
81#define EDMA_QUETCMAP 0x0280
82#define EDMA_QUEPRI 0x0284
83#define EDMA_EMR 0x0300 /* 64 bits */
84#define EDMA_EMCR 0x0308 /* 64 bits */
85#define EDMA_QEMR 0x0310
86#define EDMA_QEMCR 0x0314
87#define EDMA_CCERR 0x0318
88#define EDMA_CCERRCLR 0x031c
89#define EDMA_EEVAL 0x0320
90#define EDMA_DRAE 0x0340 /* 4 x 64 bits*/
91#define EDMA_QRAE 0x0380 /* 4 registers */
92#define EDMA_QUEEVTENTRY 0x0400 /* 2 x 16 registers */
93#define EDMA_QSTAT 0x0600 /* 2 registers */
94#define EDMA_QWMTHRA 0x0620
95#define EDMA_QWMTHRB 0x0624
96#define EDMA_CCSTAT 0x0640
97
98#define EDMA_M 0x1000 /* global channel registers */
99#define EDMA_ECR 0x1008
100#define EDMA_ECRH 0x100C
101#define EDMA_SHADOW0 0x2000 /* 4 shadow regions */
102#define EDMA_PARM 0x4000 /* PaRAM entries */
103
104#define PARM_OFFSET(param_no) (EDMA_PARM + ((param_no) << 5))
105
106#define EDMA_DCHMAP 0x0100 /* 64 registers */
107
108/* CCCFG register */
109#define GET_NUM_DMACH(x) (x & 0x7) /* bits 0-2 */
Dan Carpenterf5ea7ad2015-11-04 16:38:31 +0300110#define GET_NUM_QDMACH(x) ((x & 0x70) >> 4) /* bits 4-6 */
Peter Ujfalusi2b6b3b72015-10-14 14:42:53 +0300111#define GET_NUM_PAENTRY(x) ((x & 0x7000) >> 12) /* bits 12-14 */
112#define GET_NUM_EVQUE(x) ((x & 0x70000) >> 16) /* bits 16-18 */
113#define GET_NUM_REGN(x) ((x & 0x300000) >> 20) /* bits 20-21 */
114#define CHMAP_EXIST BIT(24)
115
John Ogness4ac31d12016-01-28 11:29:08 +0100116/* CCSTAT register */
117#define EDMA_CCSTAT_ACTV BIT(4)
118
Matt Porterc2dde5f2012-08-22 21:09:34 -0400119/*
Joel Fernandes2abd5f12013-09-23 18:05:15 -0500120 * Max of 20 segments per channel to conserve PaRAM slots
121 * Also note that MAX_NR_SG should be atleast the no.of periods
122 * that are required for ASoC, otherwise DMA prep calls will
123 * fail. Today davinci-pcm is the only user of this driver and
124 * requires atleast 17 slots, so we setup the default to 20.
125 */
126#define MAX_NR_SG 20
Matt Porterc2dde5f2012-08-22 21:09:34 -0400127#define EDMA_MAX_SLOTS MAX_NR_SG
128#define EDMA_DESCRIPTORS 16
129
Peter Ujfalusi2b6b3b72015-10-14 14:42:53 +0300130#define EDMA_CHANNEL_ANY -1 /* for edma_alloc_channel() */
131#define EDMA_SLOT_ANY -1 /* for edma_alloc_slot() */
132#define EDMA_CONT_PARAMS_ANY 1001
133#define EDMA_CONT_PARAMS_FIXED_EXACT 1002
134#define EDMA_CONT_PARAMS_FIXED_NOT_EXACT 1003
135
Peter Ujfalusi2b6b3b72015-10-14 14:42:53 +0300136/* PaRAM slots are laid out like this */
137struct edmacc_param {
138 u32 opt;
139 u32 src;
140 u32 a_b_cnt;
141 u32 dst;
142 u32 src_dst_bidx;
143 u32 link_bcntrld;
144 u32 src_dst_cidx;
145 u32 ccnt;
146} __packed;
147
148/* fields in edmacc_param.opt */
149#define SAM BIT(0)
150#define DAM BIT(1)
151#define SYNCDIM BIT(2)
152#define STATIC BIT(3)
153#define EDMA_FWID (0x07 << 8)
154#define TCCMODE BIT(11)
155#define EDMA_TCC(t) ((t) << 12)
156#define TCINTEN BIT(20)
157#define ITCINTEN BIT(21)
158#define TCCHEN BIT(22)
159#define ITCCHEN BIT(23)
160
Thomas Gleixnerb5088ad2014-04-28 14:23:55 -0500161struct edma_pset {
Thomas Gleixnerc2da2342014-04-28 14:29:57 -0500162 u32 len;
163 dma_addr_t addr;
Thomas Gleixnerb5088ad2014-04-28 14:23:55 -0500164 struct edmacc_param param;
165};
166
Matt Porterc2dde5f2012-08-22 21:09:34 -0400167struct edma_desc {
168 struct virt_dma_desc vdesc;
169 struct list_head node;
Thomas Gleixnerc2da2342014-04-28 14:29:57 -0500170 enum dma_transfer_direction direction;
Joel Fernandes50a9c702013-10-31 16:31:23 -0500171 int cyclic;
Matt Porterc2dde5f2012-08-22 21:09:34 -0400172 int absync;
173 int pset_nr;
Thomas Gleixner740b41f2014-04-28 14:34:11 -0500174 struct edma_chan *echan;
Joel Fernandes04361d82014-04-28 15:19:31 -0500175 int processed;
176
177 /*
178 * The following 4 elements are used for residue accounting.
179 *
180 * - processed_stat: the number of SG elements we have traversed
181 * so far to cover accounting. This is updated directly to processed
182 * during edma_callback and is always <= processed, because processed
183 * refers to the number of pending transfer (programmed to EDMA
184 * controller), where as processed_stat tracks number of transfers
185 * accounted for so far.
186 *
187 * - residue: The amount of bytes we have left to transfer for this desc
188 *
189 * - residue_stat: The residue in bytes of data we have covered
190 * so far for accounting. This is updated directly to residue
191 * during callbacks to keep it current.
192 *
193 * - sg_len: Tracks the length of the current intermediate transfer,
194 * this is required to update the residue during intermediate transfer
195 * completion callback.
196 */
197 int processed_stat;
198 u32 sg_len;
199 u32 residue;
200 u32 residue_stat;
201
Thomas Gleixnerb5088ad2014-04-28 14:23:55 -0500202 struct edma_pset pset[0];
Matt Porterc2dde5f2012-08-22 21:09:34 -0400203};
204
205struct edma_cc;
206
Peter Ujfalusi1be53362015-10-16 10:18:10 +0300207struct edma_tc {
208 struct device_node *node;
209 u16 id;
210};
211
Matt Porterc2dde5f2012-08-22 21:09:34 -0400212struct edma_chan {
213 struct virt_dma_chan vchan;
214 struct list_head node;
215 struct edma_desc *edesc;
216 struct edma_cc *ecc;
Peter Ujfalusi1be53362015-10-16 10:18:10 +0300217 struct edma_tc *tc;
Matt Porterc2dde5f2012-08-22 21:09:34 -0400218 int ch_num;
219 bool alloced;
Peter Ujfalusi1be53362015-10-16 10:18:10 +0300220 bool hw_triggered;
Matt Porterc2dde5f2012-08-22 21:09:34 -0400221 int slot[EDMA_MAX_SLOTS];
Joel Fernandesc5f47992013-08-29 18:05:43 -0500222 int missed;
Matt Porter661f7cb2013-01-10 13:41:04 -0500223 struct dma_slave_config cfg;
Matt Porterc2dde5f2012-08-22 21:09:34 -0400224};
225
226struct edma_cc {
Peter Ujfalusi2b6b3b72015-10-14 14:42:53 +0300227 struct device *dev;
228 struct edma_soc_info *info;
229 void __iomem *base;
230 int id;
Peter Ujfalusi1be53362015-10-16 10:18:10 +0300231 bool legacy_mode;
Peter Ujfalusi2b6b3b72015-10-14 14:42:53 +0300232
233 /* eDMA3 resource information */
234 unsigned num_channels;
Peter Ujfalusi633e42b2015-10-16 10:18:04 +0300235 unsigned num_qchannels;
Peter Ujfalusi2b6b3b72015-10-14 14:42:53 +0300236 unsigned num_region;
237 unsigned num_slots;
238 unsigned num_tc;
Peter Ujfalusi4ab54f62015-10-14 14:43:04 +0300239 bool chmap_exist;
Peter Ujfalusi2b6b3b72015-10-14 14:42:53 +0300240 enum dma_event_q default_queue;
241
Vinod Koul638001e2016-07-01 11:34:35 +0530242 unsigned int ccint;
243 unsigned int ccerrint;
244
Peter Ujfalusi1be53362015-10-16 10:18:10 +0300245 /*
246 * The slot_inuse bit for each PaRAM slot is clear unless the slot is
247 * in use by Linux or if it is allocated to be used by DSP.
Peter Ujfalusi2b6b3b72015-10-14 14:42:53 +0300248 */
Peter Ujfalusi7a73b132015-10-14 14:43:05 +0300249 unsigned long *slot_inuse;
Peter Ujfalusi2b6b3b72015-10-14 14:42:53 +0300250
Matt Porterc2dde5f2012-08-22 21:09:34 -0400251 struct dma_device dma_slave;
Peter Ujfalusi1be53362015-10-16 10:18:10 +0300252 struct dma_device *dma_memcpy;
Peter Ujfalusicb782052015-10-14 14:42:54 +0300253 struct edma_chan *slave_chans;
Peter Ujfalusi1be53362015-10-16 10:18:10 +0300254 struct edma_tc *tc_list;
Matt Porterc2dde5f2012-08-22 21:09:34 -0400255 int dummy_slot;
256};
257
Peter Ujfalusi2b6b3b72015-10-14 14:42:53 +0300258/* dummy param set used to (re)initialize parameter RAM slots */
259static const struct edmacc_param dummy_paramset = {
260 .link_bcntrld = 0xffff,
261 .ccnt = 1,
262};
263
Peter Ujfalusi1be53362015-10-16 10:18:10 +0300264#define EDMA_BINDING_LEGACY 0
265#define EDMA_BINDING_TPCC 1
Peter Ujfalusib7862742016-09-21 15:41:28 +0300266static const u32 edma_binding_type[] = {
267 [EDMA_BINDING_LEGACY] = EDMA_BINDING_LEGACY,
268 [EDMA_BINDING_TPCC] = EDMA_BINDING_TPCC,
269};
270
Peter Ujfalusi2b6b3b72015-10-14 14:42:53 +0300271static const struct of_device_id edma_of_ids[] = {
Peter Ujfalusi1be53362015-10-16 10:18:10 +0300272 {
273 .compatible = "ti,edma3",
Peter Ujfalusib7862742016-09-21 15:41:28 +0300274 .data = &edma_binding_type[EDMA_BINDING_LEGACY],
Peter Ujfalusi1be53362015-10-16 10:18:10 +0300275 },
276 {
277 .compatible = "ti,edma3-tpcc",
Peter Ujfalusib7862742016-09-21 15:41:28 +0300278 .data = &edma_binding_type[EDMA_BINDING_TPCC],
Peter Ujfalusi1be53362015-10-16 10:18:10 +0300279 },
Peter Ujfalusi2b6b3b72015-10-14 14:42:53 +0300280 {}
281};
Peter Ujfalusi86737512016-09-21 15:41:27 +0300282MODULE_DEVICE_TABLE(of, edma_of_ids);
Peter Ujfalusi2b6b3b72015-10-14 14:42:53 +0300283
Peter Ujfalusi34635b1a2015-11-02 15:21:40 +0200284static const struct of_device_id edma_tptc_of_ids[] = {
285 { .compatible = "ti,edma3-tptc", },
286 {}
287};
Peter Ujfalusi86737512016-09-21 15:41:27 +0300288MODULE_DEVICE_TABLE(of, edma_tptc_of_ids);
Peter Ujfalusi34635b1a2015-11-02 15:21:40 +0200289
Peter Ujfalusi2b6b3b72015-10-14 14:42:53 +0300290static inline unsigned int edma_read(struct edma_cc *ecc, int offset)
291{
292 return (unsigned int)__raw_readl(ecc->base + offset);
293}
294
295static inline void edma_write(struct edma_cc *ecc, int offset, int val)
296{
297 __raw_writel(val, ecc->base + offset);
298}
299
300static inline void edma_modify(struct edma_cc *ecc, int offset, unsigned and,
301 unsigned or)
302{
303 unsigned val = edma_read(ecc, offset);
304
305 val &= and;
306 val |= or;
307 edma_write(ecc, offset, val);
308}
309
310static inline void edma_and(struct edma_cc *ecc, int offset, unsigned and)
311{
312 unsigned val = edma_read(ecc, offset);
313
314 val &= and;
315 edma_write(ecc, offset, val);
316}
317
318static inline void edma_or(struct edma_cc *ecc, int offset, unsigned or)
319{
320 unsigned val = edma_read(ecc, offset);
321
322 val |= or;
323 edma_write(ecc, offset, val);
324}
325
326static inline unsigned int edma_read_array(struct edma_cc *ecc, int offset,
327 int i)
328{
329 return edma_read(ecc, offset + (i << 2));
330}
331
332static inline void edma_write_array(struct edma_cc *ecc, int offset, int i,
333 unsigned val)
334{
335 edma_write(ecc, offset + (i << 2), val);
336}
337
338static inline void edma_modify_array(struct edma_cc *ecc, int offset, int i,
339 unsigned and, unsigned or)
340{
341 edma_modify(ecc, offset + (i << 2), and, or);
342}
343
344static inline void edma_or_array(struct edma_cc *ecc, int offset, int i,
345 unsigned or)
346{
347 edma_or(ecc, offset + (i << 2), or);
348}
349
350static inline void edma_or_array2(struct edma_cc *ecc, int offset, int i, int j,
351 unsigned or)
352{
353 edma_or(ecc, offset + ((i * 2 + j) << 2), or);
354}
355
356static inline void edma_write_array2(struct edma_cc *ecc, int offset, int i,
357 int j, unsigned val)
358{
359 edma_write(ecc, offset + ((i * 2 + j) << 2), val);
360}
361
362static inline unsigned int edma_shadow0_read(struct edma_cc *ecc, int offset)
363{
364 return edma_read(ecc, EDMA_SHADOW0 + offset);
365}
366
367static inline unsigned int edma_shadow0_read_array(struct edma_cc *ecc,
368 int offset, int i)
369{
370 return edma_read(ecc, EDMA_SHADOW0 + offset + (i << 2));
371}
372
373static inline void edma_shadow0_write(struct edma_cc *ecc, int offset,
374 unsigned val)
375{
376 edma_write(ecc, EDMA_SHADOW0 + offset, val);
377}
378
379static inline void edma_shadow0_write_array(struct edma_cc *ecc, int offset,
380 int i, unsigned val)
381{
382 edma_write(ecc, EDMA_SHADOW0 + offset + (i << 2), val);
383}
384
Peter Ujfalusid9c345d2015-10-16 10:18:02 +0300385static inline unsigned int edma_param_read(struct edma_cc *ecc, int offset,
386 int param_no)
Peter Ujfalusi2b6b3b72015-10-14 14:42:53 +0300387{
388 return edma_read(ecc, EDMA_PARM + offset + (param_no << 5));
389}
390
Peter Ujfalusid9c345d2015-10-16 10:18:02 +0300391static inline void edma_param_write(struct edma_cc *ecc, int offset,
392 int param_no, unsigned val)
Peter Ujfalusi2b6b3b72015-10-14 14:42:53 +0300393{
394 edma_write(ecc, EDMA_PARM + offset + (param_no << 5), val);
395}
396
Peter Ujfalusid9c345d2015-10-16 10:18:02 +0300397static inline void edma_param_modify(struct edma_cc *ecc, int offset,
398 int param_no, unsigned and, unsigned or)
Peter Ujfalusi2b6b3b72015-10-14 14:42:53 +0300399{
400 edma_modify(ecc, EDMA_PARM + offset + (param_no << 5), and, or);
401}
402
Peter Ujfalusid9c345d2015-10-16 10:18:02 +0300403static inline void edma_param_and(struct edma_cc *ecc, int offset, int param_no,
404 unsigned and)
Peter Ujfalusi2b6b3b72015-10-14 14:42:53 +0300405{
406 edma_and(ecc, EDMA_PARM + offset + (param_no << 5), and);
407}
408
Peter Ujfalusid9c345d2015-10-16 10:18:02 +0300409static inline void edma_param_or(struct edma_cc *ecc, int offset, int param_no,
410 unsigned or)
Peter Ujfalusi2b6b3b72015-10-14 14:42:53 +0300411{
412 edma_or(ecc, EDMA_PARM + offset + (param_no << 5), or);
413}
414
Peter Ujfalusi1634d302016-09-22 09:31:04 +0300415static inline void edma_set_bits(int offset, int len, unsigned long *p)
Peter Ujfalusi2b6b3b72015-10-14 14:42:53 +0300416{
417 for (; len > 0; len--)
418 set_bit(offset + (len - 1), p);
419}
420
Peter Ujfalusi2b6b3b72015-10-14 14:42:53 +0300421static void edma_assign_priority_to_queue(struct edma_cc *ecc, int queue_no,
422 int priority)
423{
424 int bit = queue_no * 4;
425
426 edma_modify(ecc, EDMA_QUEPRI, ~(0x7 << bit), ((priority & 0x7) << bit));
427}
428
Peter Ujfalusi34cf3012015-10-16 10:18:01 +0300429static void edma_set_chmap(struct edma_chan *echan, int slot)
Peter Ujfalusi2b6b3b72015-10-14 14:42:53 +0300430{
Peter Ujfalusi34cf3012015-10-16 10:18:01 +0300431 struct edma_cc *ecc = echan->ecc;
432 int channel = EDMA_CHAN_SLOT(echan->ch_num);
433
Peter Ujfalusie4e886c2015-10-14 14:43:06 +0300434 if (ecc->chmap_exist) {
Peter Ujfalusie4e886c2015-10-14 14:43:06 +0300435 slot = EDMA_CHAN_SLOT(slot);
436 edma_write_array(ecc, EDMA_DCHMAP, channel, (slot << 5));
437 }
Peter Ujfalusi2b6b3b72015-10-14 14:42:53 +0300438}
439
Peter Ujfalusi34cf3012015-10-16 10:18:01 +0300440static void edma_setup_interrupt(struct edma_chan *echan, bool enable)
Peter Ujfalusi2b6b3b72015-10-14 14:42:53 +0300441{
Peter Ujfalusi34cf3012015-10-16 10:18:01 +0300442 struct edma_cc *ecc = echan->ecc;
443 int channel = EDMA_CHAN_SLOT(echan->ch_num);
Peter Ujfalusi2b6b3b72015-10-14 14:42:53 +0300444
Peter Ujfalusi79ad2e32015-10-14 14:43:01 +0300445 if (enable) {
Peter Ujfalusi34cf3012015-10-16 10:18:01 +0300446 edma_shadow0_write_array(ecc, SH_ICR, channel >> 5,
447 BIT(channel & 0x1f));
448 edma_shadow0_write_array(ecc, SH_IESR, channel >> 5,
449 BIT(channel & 0x1f));
Peter Ujfalusi79ad2e32015-10-14 14:43:01 +0300450 } else {
Peter Ujfalusi34cf3012015-10-16 10:18:01 +0300451 edma_shadow0_write_array(ecc, SH_IECR, channel >> 5,
452 BIT(channel & 0x1f));
Peter Ujfalusi2b6b3b72015-10-14 14:42:53 +0300453 }
454}
455
456/*
Peter Ujfalusi11c15732015-10-14 14:43:00 +0300457 * paRAM slot management functions
Peter Ujfalusi2b6b3b72015-10-14 14:42:53 +0300458 */
459static void edma_write_slot(struct edma_cc *ecc, unsigned slot,
460 const struct edmacc_param *param)
461{
462 slot = EDMA_CHAN_SLOT(slot);
463 if (slot >= ecc->num_slots)
464 return;
465 memcpy_toio(ecc->base + PARM_OFFSET(slot), param, PARM_SIZE);
466}
467
Arnd Bergmann2cc40ee2016-09-30 18:19:01 +0200468static int edma_read_slot(struct edma_cc *ecc, unsigned slot,
Peter Ujfalusi2b6b3b72015-10-14 14:42:53 +0300469 struct edmacc_param *param)
470{
471 slot = EDMA_CHAN_SLOT(slot);
472 if (slot >= ecc->num_slots)
Arnd Bergmann2cc40ee2016-09-30 18:19:01 +0200473 return -EINVAL;
Peter Ujfalusi2b6b3b72015-10-14 14:42:53 +0300474 memcpy_fromio(param, ecc->base + PARM_OFFSET(slot), PARM_SIZE);
Arnd Bergmann2cc40ee2016-09-30 18:19:01 +0200475
476 return 0;
Peter Ujfalusi2b6b3b72015-10-14 14:42:53 +0300477}
478
479/**
480 * edma_alloc_slot - allocate DMA parameter RAM
481 * @ecc: pointer to edma_cc struct
482 * @slot: specific slot to allocate; negative for "any unused slot"
483 *
484 * This allocates a parameter RAM slot, initializing it to hold a
485 * dummy transfer. Slots allocated using this routine have not been
486 * mapped to a hardware DMA channel, and will normally be used by
487 * linking to them from a slot associated with a DMA channel.
488 *
489 * Normal use is to pass EDMA_SLOT_ANY as the @slot, but specific
490 * slots may be allocated on behalf of DSP firmware.
491 *
492 * Returns the number of the slot, else negative errno.
493 */
494static int edma_alloc_slot(struct edma_cc *ecc, int slot)
495{
Peter Ujfalusid20313b2016-01-11 10:38:01 +0200496 if (slot >= 0) {
Peter Ujfalusi2b6b3b72015-10-14 14:42:53 +0300497 slot = EDMA_CHAN_SLOT(slot);
Peter Ujfalusie4e886c2015-10-14 14:43:06 +0300498 /* Requesting entry paRAM slot for a HW triggered channel. */
499 if (ecc->chmap_exist && slot < ecc->num_channels)
500 slot = EDMA_SLOT_ANY;
501 }
502
Peter Ujfalusi2b6b3b72015-10-14 14:42:53 +0300503 if (slot < 0) {
Peter Ujfalusie4e886c2015-10-14 14:43:06 +0300504 if (ecc->chmap_exist)
505 slot = 0;
506 else
507 slot = ecc->num_channels;
Peter Ujfalusi2b6b3b72015-10-14 14:42:53 +0300508 for (;;) {
Peter Ujfalusi7a73b132015-10-14 14:43:05 +0300509 slot = find_next_zero_bit(ecc->slot_inuse,
Peter Ujfalusi2b6b3b72015-10-14 14:42:53 +0300510 ecc->num_slots,
511 slot);
512 if (slot == ecc->num_slots)
513 return -ENOMEM;
Peter Ujfalusi7a73b132015-10-14 14:43:05 +0300514 if (!test_and_set_bit(slot, ecc->slot_inuse))
Peter Ujfalusi2b6b3b72015-10-14 14:42:53 +0300515 break;
516 }
Peter Ujfalusie4e886c2015-10-14 14:43:06 +0300517 } else if (slot >= ecc->num_slots) {
Peter Ujfalusi2b6b3b72015-10-14 14:42:53 +0300518 return -EINVAL;
Peter Ujfalusi7a73b132015-10-14 14:43:05 +0300519 } else if (test_and_set_bit(slot, ecc->slot_inuse)) {
Peter Ujfalusi2b6b3b72015-10-14 14:42:53 +0300520 return -EBUSY;
521 }
522
523 edma_write_slot(ecc, slot, &dummy_paramset);
524
525 return EDMA_CTLR_CHAN(ecc->id, slot);
526}
527
Peter Ujfalusi2b6b3b72015-10-14 14:42:53 +0300528static void edma_free_slot(struct edma_cc *ecc, unsigned slot)
529{
530 slot = EDMA_CHAN_SLOT(slot);
Peter Ujfalusie4e886c2015-10-14 14:43:06 +0300531 if (slot >= ecc->num_slots)
Peter Ujfalusi2b6b3b72015-10-14 14:42:53 +0300532 return;
533
534 edma_write_slot(ecc, slot, &dummy_paramset);
Peter Ujfalusi7a73b132015-10-14 14:43:05 +0300535 clear_bit(slot, ecc->slot_inuse);
Peter Ujfalusi2b6b3b72015-10-14 14:42:53 +0300536}
537
538/**
539 * edma_link - link one parameter RAM slot to another
540 * @ecc: pointer to edma_cc struct
541 * @from: parameter RAM slot originating the link
542 * @to: parameter RAM slot which is the link target
543 *
544 * The originating slot should not be part of any active DMA transfer.
545 */
546static void edma_link(struct edma_cc *ecc, unsigned from, unsigned to)
547{
Peter Ujfalusifc014092015-10-14 14:42:59 +0300548 if (unlikely(EDMA_CTLR(from) != EDMA_CTLR(to)))
549 dev_warn(ecc->dev, "Ignoring eDMA instance for linking\n");
550
Peter Ujfalusi2b6b3b72015-10-14 14:42:53 +0300551 from = EDMA_CHAN_SLOT(from);
552 to = EDMA_CHAN_SLOT(to);
553 if (from >= ecc->num_slots || to >= ecc->num_slots)
554 return;
555
Peter Ujfalusid9c345d2015-10-16 10:18:02 +0300556 edma_param_modify(ecc, PARM_LINK_BCNTRLD, from, 0xffff0000,
557 PARM_OFFSET(to));
Peter Ujfalusi2b6b3b72015-10-14 14:42:53 +0300558}
559
560/**
561 * edma_get_position - returns the current transfer point
562 * @ecc: pointer to edma_cc struct
563 * @slot: parameter RAM slot being examined
564 * @dst: true selects the dest position, false the source
565 *
566 * Returns the position of the current active slot
567 */
568static dma_addr_t edma_get_position(struct edma_cc *ecc, unsigned slot,
569 bool dst)
570{
571 u32 offs;
572
573 slot = EDMA_CHAN_SLOT(slot);
574 offs = PARM_OFFSET(slot);
575 offs += dst ? PARM_DST : PARM_SRC;
576
577 return edma_read(ecc, offs);
578}
579
Peter Ujfalusi34cf3012015-10-16 10:18:01 +0300580/*
Peter Ujfalusi2b6b3b72015-10-14 14:42:53 +0300581 * Channels with event associations will be triggered by their hardware
582 * events, and channels without such associations will be triggered by
583 * software. (At this writing there is no interface for using software
584 * triggers except with channels that don't support hardware triggers.)
Peter Ujfalusi2b6b3b72015-10-14 14:42:53 +0300585 */
Peter Ujfalusi34cf3012015-10-16 10:18:01 +0300586static void edma_start(struct edma_chan *echan)
Peter Ujfalusi2b6b3b72015-10-14 14:42:53 +0300587{
Peter Ujfalusi34cf3012015-10-16 10:18:01 +0300588 struct edma_cc *ecc = echan->ecc;
589 int channel = EDMA_CHAN_SLOT(echan->ch_num);
590 int j = (channel >> 5);
591 unsigned int mask = BIT(channel & 0x1f);
Peter Ujfalusi2b6b3b72015-10-14 14:42:53 +0300592
Peter Ujfalusi1be53362015-10-16 10:18:10 +0300593 if (!echan->hw_triggered) {
Peter Ujfalusi2b6b3b72015-10-14 14:42:53 +0300594 /* EDMA channels without event association */
Peter Ujfalusi34cf3012015-10-16 10:18:01 +0300595 dev_dbg(ecc->dev, "ESR%d %08x\n", j,
596 edma_shadow0_read_array(ecc, SH_ESR, j));
597 edma_shadow0_write_array(ecc, SH_ESR, j, mask);
598 } else {
Peter Ujfalusi2b6b3b72015-10-14 14:42:53 +0300599 /* EDMA channel with event association */
Peter Ujfalusi3287fb42015-10-14 14:42:57 +0300600 dev_dbg(ecc->dev, "ER%d %08x\n", j,
601 edma_shadow0_read_array(ecc, SH_ER, j));
Peter Ujfalusi2b6b3b72015-10-14 14:42:53 +0300602 /* Clear any pending event or error */
603 edma_write_array(ecc, EDMA_ECR, j, mask);
604 edma_write_array(ecc, EDMA_EMCR, j, mask);
605 /* Clear any SER */
606 edma_shadow0_write_array(ecc, SH_SECR, j, mask);
607 edma_shadow0_write_array(ecc, SH_EESR, j, mask);
Peter Ujfalusi3287fb42015-10-14 14:42:57 +0300608 dev_dbg(ecc->dev, "EER%d %08x\n", j,
609 edma_shadow0_read_array(ecc, SH_EER, j));
Peter Ujfalusi2b6b3b72015-10-14 14:42:53 +0300610 }
Peter Ujfalusi2b6b3b72015-10-14 14:42:53 +0300611}
612
Peter Ujfalusi34cf3012015-10-16 10:18:01 +0300613static void edma_stop(struct edma_chan *echan)
Peter Ujfalusi2b6b3b72015-10-14 14:42:53 +0300614{
Peter Ujfalusi34cf3012015-10-16 10:18:01 +0300615 struct edma_cc *ecc = echan->ecc;
616 int channel = EDMA_CHAN_SLOT(echan->ch_num);
617 int j = (channel >> 5);
618 unsigned int mask = BIT(channel & 0x1f);
Peter Ujfalusi2b6b3b72015-10-14 14:42:53 +0300619
Peter Ujfalusi34cf3012015-10-16 10:18:01 +0300620 edma_shadow0_write_array(ecc, SH_EECR, j, mask);
621 edma_shadow0_write_array(ecc, SH_ECR, j, mask);
622 edma_shadow0_write_array(ecc, SH_SECR, j, mask);
623 edma_write_array(ecc, EDMA_EMCR, j, mask);
Peter Ujfalusi2b6b3b72015-10-14 14:42:53 +0300624
Peter Ujfalusi34cf3012015-10-16 10:18:01 +0300625 /* clear possibly pending completion interrupt */
626 edma_shadow0_write_array(ecc, SH_ICR, j, mask);
Peter Ujfalusi2b6b3b72015-10-14 14:42:53 +0300627
Peter Ujfalusi34cf3012015-10-16 10:18:01 +0300628 dev_dbg(ecc->dev, "EER%d %08x\n", j,
629 edma_shadow0_read_array(ecc, SH_EER, j));
Peter Ujfalusi2b6b3b72015-10-14 14:42:53 +0300630
Peter Ujfalusi34cf3012015-10-16 10:18:01 +0300631 /* REVISIT: consider guarding against inappropriate event
632 * chaining by overwriting with dummy_paramset.
633 */
Peter Ujfalusi2b6b3b72015-10-14 14:42:53 +0300634}
635
Peter Ujfalusi11c15732015-10-14 14:43:00 +0300636/*
637 * Temporarily disable EDMA hardware events on the specified channel,
638 * preventing them from triggering new transfers
Peter Ujfalusi2b6b3b72015-10-14 14:42:53 +0300639 */
Peter Ujfalusi34cf3012015-10-16 10:18:01 +0300640static void edma_pause(struct edma_chan *echan)
Peter Ujfalusi2b6b3b72015-10-14 14:42:53 +0300641{
Peter Ujfalusi34cf3012015-10-16 10:18:01 +0300642 int channel = EDMA_CHAN_SLOT(echan->ch_num);
643 unsigned int mask = BIT(channel & 0x1f);
Peter Ujfalusi2b6b3b72015-10-14 14:42:53 +0300644
Peter Ujfalusi34cf3012015-10-16 10:18:01 +0300645 edma_shadow0_write_array(echan->ecc, SH_EECR, channel >> 5, mask);
Peter Ujfalusi2b6b3b72015-10-14 14:42:53 +0300646}
647
Peter Ujfalusi11c15732015-10-14 14:43:00 +0300648/* Re-enable EDMA hardware events on the specified channel. */
Peter Ujfalusi34cf3012015-10-16 10:18:01 +0300649static void edma_resume(struct edma_chan *echan)
Peter Ujfalusi2b6b3b72015-10-14 14:42:53 +0300650{
Peter Ujfalusi34cf3012015-10-16 10:18:01 +0300651 int channel = EDMA_CHAN_SLOT(echan->ch_num);
652 unsigned int mask = BIT(channel & 0x1f);
Peter Ujfalusi2b6b3b72015-10-14 14:42:53 +0300653
Peter Ujfalusi34cf3012015-10-16 10:18:01 +0300654 edma_shadow0_write_array(echan->ecc, SH_EESR, channel >> 5, mask);
Peter Ujfalusi2b6b3b72015-10-14 14:42:53 +0300655}
656
Peter Ujfalusi34cf3012015-10-16 10:18:01 +0300657static void edma_trigger_channel(struct edma_chan *echan)
Peter Ujfalusi2b6b3b72015-10-14 14:42:53 +0300658{
Peter Ujfalusi34cf3012015-10-16 10:18:01 +0300659 struct edma_cc *ecc = echan->ecc;
660 int channel = EDMA_CHAN_SLOT(echan->ch_num);
661 unsigned int mask = BIT(channel & 0x1f);
Peter Ujfalusi2b6b3b72015-10-14 14:42:53 +0300662
663 edma_shadow0_write_array(ecc, SH_ESR, (channel >> 5), mask);
664
Peter Ujfalusi3287fb42015-10-14 14:42:57 +0300665 dev_dbg(ecc->dev, "ESR%d %08x\n", (channel >> 5),
666 edma_shadow0_read_array(ecc, SH_ESR, (channel >> 5)));
Peter Ujfalusi2b6b3b72015-10-14 14:42:53 +0300667}
668
Peter Ujfalusi34cf3012015-10-16 10:18:01 +0300669static void edma_clean_channel(struct edma_chan *echan)
Peter Ujfalusi2b6b3b72015-10-14 14:42:53 +0300670{
Peter Ujfalusi34cf3012015-10-16 10:18:01 +0300671 struct edma_cc *ecc = echan->ecc;
672 int channel = EDMA_CHAN_SLOT(echan->ch_num);
673 int j = (channel >> 5);
674 unsigned int mask = BIT(channel & 0x1f);
Peter Ujfalusi2b6b3b72015-10-14 14:42:53 +0300675
Peter Ujfalusi34cf3012015-10-16 10:18:01 +0300676 dev_dbg(ecc->dev, "EMR%d %08x\n", j, edma_read_array(ecc, EDMA_EMR, j));
677 edma_shadow0_write_array(ecc, SH_ECR, j, mask);
678 /* Clear the corresponding EMR bits */
679 edma_write_array(ecc, EDMA_EMCR, j, mask);
680 /* Clear any SER */
681 edma_shadow0_write_array(ecc, SH_SECR, j, mask);
682 edma_write(ecc, EDMA_CCERRCLR, BIT(16) | BIT(1) | BIT(0));
Peter Ujfalusi2b6b3b72015-10-14 14:42:53 +0300683}
684
Peter Ujfalusif9425de2015-10-16 10:18:03 +0300685/* Move channel to a specific event queue */
686static void edma_assign_channel_eventq(struct edma_chan *echan,
687 enum dma_event_q eventq_no)
688{
689 struct edma_cc *ecc = echan->ecc;
690 int channel = EDMA_CHAN_SLOT(echan->ch_num);
691 int bit = (channel & 0x7) * 4;
692
693 /* default to low priority queue */
694 if (eventq_no == EVENTQ_DEFAULT)
695 eventq_no = ecc->default_queue;
696 if (eventq_no >= ecc->num_tc)
697 return;
698
699 eventq_no &= 7;
700 edma_modify_array(ecc, EDMA_DMAQNUM, (channel >> 3), ~(0x7 << bit),
701 eventq_no << bit);
702}
703
Peter Ujfalusi34cf3012015-10-16 10:18:01 +0300704static int edma_alloc_channel(struct edma_chan *echan,
Peter Ujfalusi79ad2e32015-10-14 14:43:01 +0300705 enum dma_event_q eventq_no)
Peter Ujfalusi2b6b3b72015-10-14 14:42:53 +0300706{
Peter Ujfalusi34cf3012015-10-16 10:18:01 +0300707 struct edma_cc *ecc = echan->ecc;
708 int channel = EDMA_CHAN_SLOT(echan->ch_num);
Peter Ujfalusi2b6b3b72015-10-14 14:42:53 +0300709
Peter Ujfalusi2b6b3b72015-10-14 14:42:53 +0300710 /* ensure access through shadow region 0 */
711 edma_or_array2(ecc, EDMA_DRAE, 0, channel >> 5, BIT(channel & 0x1f));
712
713 /* ensure no events are pending */
Peter Ujfalusi34cf3012015-10-16 10:18:01 +0300714 edma_stop(echan);
Peter Ujfalusi2b6b3b72015-10-14 14:42:53 +0300715
Peter Ujfalusi34cf3012015-10-16 10:18:01 +0300716 edma_setup_interrupt(echan, true);
Peter Ujfalusi2b6b3b72015-10-14 14:42:53 +0300717
Peter Ujfalusif9425de2015-10-16 10:18:03 +0300718 edma_assign_channel_eventq(echan, eventq_no);
Peter Ujfalusi2b6b3b72015-10-14 14:42:53 +0300719
Peter Ujfalusi34cf3012015-10-16 10:18:01 +0300720 return 0;
Peter Ujfalusi2b6b3b72015-10-14 14:42:53 +0300721}
722
Peter Ujfalusi34cf3012015-10-16 10:18:01 +0300723static void edma_free_channel(struct edma_chan *echan)
Peter Ujfalusi2b6b3b72015-10-14 14:42:53 +0300724{
Peter Ujfalusi34cf3012015-10-16 10:18:01 +0300725 /* ensure no events are pending */
726 edma_stop(echan);
Peter Ujfalusi2b6b3b72015-10-14 14:42:53 +0300727 /* REVISIT should probably take out of shadow region 0 */
Peter Ujfalusi34cf3012015-10-16 10:18:01 +0300728 edma_setup_interrupt(echan, false);
Peter Ujfalusi2b6b3b72015-10-14 14:42:53 +0300729}
730
Matt Porterc2dde5f2012-08-22 21:09:34 -0400731static inline struct edma_cc *to_edma_cc(struct dma_device *d)
732{
733 return container_of(d, struct edma_cc, dma_slave);
734}
735
736static inline struct edma_chan *to_edma_chan(struct dma_chan *c)
737{
738 return container_of(c, struct edma_chan, vchan.chan);
739}
740
Peter Ujfalusi2b6b3b72015-10-14 14:42:53 +0300741static inline struct edma_desc *to_edma_desc(struct dma_async_tx_descriptor *tx)
Matt Porterc2dde5f2012-08-22 21:09:34 -0400742{
743 return container_of(tx, struct edma_desc, vdesc.tx);
744}
745
746static void edma_desc_free(struct virt_dma_desc *vdesc)
747{
748 kfree(container_of(vdesc, struct edma_desc, vdesc));
749}
750
751/* Dispatch a queued descriptor to the controller (caller holds lock) */
752static void edma_execute(struct edma_chan *echan)
753{
Peter Ujfalusi2b6b3b72015-10-14 14:42:53 +0300754 struct edma_cc *ecc = echan->ecc;
Joel Fernandes53407062013-09-03 10:02:46 -0500755 struct virt_dma_desc *vdesc;
Matt Porterc2dde5f2012-08-22 21:09:34 -0400756 struct edma_desc *edesc;
Joel Fernandes53407062013-09-03 10:02:46 -0500757 struct device *dev = echan->vchan.chan.device->dev;
758 int i, j, left, nslots;
Matt Porterc2dde5f2012-08-22 21:09:34 -0400759
Peter Ujfalusi8fa7ff42015-10-14 14:42:45 +0300760 if (!echan->edesc) {
761 /* Setup is needed for the first transfer */
Joel Fernandes53407062013-09-03 10:02:46 -0500762 vdesc = vchan_next_desc(&echan->vchan);
Peter Ujfalusi8fa7ff42015-10-14 14:42:45 +0300763 if (!vdesc)
Joel Fernandes53407062013-09-03 10:02:46 -0500764 return;
Joel Fernandes53407062013-09-03 10:02:46 -0500765 list_del(&vdesc->node);
766 echan->edesc = to_edma_desc(&vdesc->tx);
Matt Porterc2dde5f2012-08-22 21:09:34 -0400767 }
768
Joel Fernandes53407062013-09-03 10:02:46 -0500769 edesc = echan->edesc;
Matt Porterc2dde5f2012-08-22 21:09:34 -0400770
Joel Fernandes53407062013-09-03 10:02:46 -0500771 /* Find out how many left */
772 left = edesc->pset_nr - edesc->processed;
773 nslots = min(MAX_NR_SG, left);
Thomas Gleixner740b41f2014-04-28 14:34:11 -0500774 edesc->sg_len = 0;
Matt Porterc2dde5f2012-08-22 21:09:34 -0400775
776 /* Write descriptor PaRAM set(s) */
Joel Fernandes53407062013-09-03 10:02:46 -0500777 for (i = 0; i < nslots; i++) {
778 j = i + edesc->processed;
Peter Ujfalusi2b6b3b72015-10-14 14:42:53 +0300779 edma_write_slot(ecc, echan->slot[i], &edesc->pset[j].param);
Thomas Gleixner740b41f2014-04-28 14:34:11 -0500780 edesc->sg_len += edesc->pset[j].len;
Peter Ujfalusi907f74a2015-10-14 14:42:56 +0300781 dev_vdbg(dev,
782 "\n pset[%d]:\n"
783 " chnum\t%d\n"
784 " slot\t%d\n"
785 " opt\t%08x\n"
786 " src\t%08x\n"
787 " dst\t%08x\n"
788 " abcnt\t%08x\n"
789 " ccnt\t%08x\n"
790 " bidx\t%08x\n"
791 " cidx\t%08x\n"
792 " lkrld\t%08x\n",
793 j, echan->ch_num, echan->slot[i],
794 edesc->pset[j].param.opt,
795 edesc->pset[j].param.src,
796 edesc->pset[j].param.dst,
797 edesc->pset[j].param.a_b_cnt,
798 edesc->pset[j].param.ccnt,
799 edesc->pset[j].param.src_dst_bidx,
800 edesc->pset[j].param.src_dst_cidx,
801 edesc->pset[j].param.link_bcntrld);
Matt Porterc2dde5f2012-08-22 21:09:34 -0400802 /* Link to the previous slot if not the last set */
Joel Fernandes53407062013-09-03 10:02:46 -0500803 if (i != (nslots - 1))
Peter Ujfalusi2b6b3b72015-10-14 14:42:53 +0300804 edma_link(ecc, echan->slot[i], echan->slot[i + 1]);
Matt Porterc2dde5f2012-08-22 21:09:34 -0400805 }
806
Joel Fernandes53407062013-09-03 10:02:46 -0500807 edesc->processed += nslots;
808
Joel Fernandesb267b3b2013-08-29 18:05:44 -0500809 /*
810 * If this is either the last set in a set of SG-list transactions
811 * then setup a link to the dummy slot, this results in all future
812 * events being absorbed and that's OK because we're done
813 */
Joel Fernandes50a9c702013-10-31 16:31:23 -0500814 if (edesc->processed == edesc->pset_nr) {
815 if (edesc->cyclic)
Peter Ujfalusi2b6b3b72015-10-14 14:42:53 +0300816 edma_link(ecc, echan->slot[nslots - 1], echan->slot[1]);
Joel Fernandes50a9c702013-10-31 16:31:23 -0500817 else
Peter Ujfalusi2b6b3b72015-10-14 14:42:53 +0300818 edma_link(ecc, echan->slot[nslots - 1],
Joel Fernandes50a9c702013-10-31 16:31:23 -0500819 echan->ecc->dummy_slot);
820 }
Joel Fernandesb267b3b2013-08-29 18:05:44 -0500821
Peter Ujfalusi8fa7ff42015-10-14 14:42:45 +0300822 if (echan->missed) {
823 /*
824 * This happens due to setup times between intermediate
825 * transfers in long SG lists which have to be broken up into
826 * transfers of MAX_NR_SG
827 */
828 dev_dbg(dev, "missed event on channel %d\n", echan->ch_num);
Peter Ujfalusi34cf3012015-10-16 10:18:01 +0300829 edma_clean_channel(echan);
830 edma_stop(echan);
831 edma_start(echan);
832 edma_trigger_channel(echan);
Peter Ujfalusi8fa7ff42015-10-14 14:42:45 +0300833 echan->missed = 0;
834 } else if (edesc->processed <= MAX_NR_SG) {
Peter Ujfalusi9aac9092014-04-24 10:29:50 +0300835 dev_dbg(dev, "first transfer starting on channel %d\n",
836 echan->ch_num);
Peter Ujfalusi34cf3012015-10-16 10:18:01 +0300837 edma_start(echan);
Sekhar Nori5fc68a62014-03-19 11:25:50 +0530838 } else {
839 dev_dbg(dev, "chan: %d: completed %d elements, resuming\n",
840 echan->ch_num, edesc->processed);
Peter Ujfalusi34cf3012015-10-16 10:18:01 +0300841 edma_resume(echan);
Joel Fernandes53407062013-09-03 10:02:46 -0500842 }
Matt Porterc2dde5f2012-08-22 21:09:34 -0400843}
844
Maxime Ripardaa7c09b2014-11-17 14:42:13 +0100845static int edma_terminate_all(struct dma_chan *chan)
Matt Porterc2dde5f2012-08-22 21:09:34 -0400846{
Maxime Ripardaa7c09b2014-11-17 14:42:13 +0100847 struct edma_chan *echan = to_edma_chan(chan);
Matt Porterc2dde5f2012-08-22 21:09:34 -0400848 unsigned long flags;
849 LIST_HEAD(head);
850
851 spin_lock_irqsave(&echan->vchan.lock, flags);
852
853 /*
854 * Stop DMA activity: we assume the callback will not be called
855 * after edma_dma() returns (even if it does, it will see
856 * echan->edesc is NULL and exit.)
857 */
858 if (echan->edesc) {
Peter Ujfalusi34cf3012015-10-16 10:18:01 +0300859 edma_stop(echan);
Peter Ujfalusi8fa7ff42015-10-14 14:42:45 +0300860 /* Move the cyclic channel back to default queue */
Peter Ujfalusi1be53362015-10-16 10:18:10 +0300861 if (!echan->tc && echan->edesc->cyclic)
Peter Ujfalusi34cf3012015-10-16 10:18:01 +0300862 edma_assign_channel_eventq(echan, EVENTQ_DEFAULT);
Petr Kulhavy5ca9e7c2015-03-27 13:35:51 +0200863 /*
864 * free the running request descriptor
865 * since it is not in any of the vdesc lists
866 */
867 edma_desc_free(&echan->edesc->vdesc);
Matt Porterc2dde5f2012-08-22 21:09:34 -0400868 echan->edesc = NULL;
Matt Porterc2dde5f2012-08-22 21:09:34 -0400869 }
870
871 vchan_get_all_descriptors(&echan->vchan, &head);
872 spin_unlock_irqrestore(&echan->vchan.lock, flags);
873 vchan_dma_desc_free_list(&echan->vchan, &head);
874
875 return 0;
876}
877
Peter Ujfalusib84730f2016-02-11 11:08:42 +0200878static void edma_synchronize(struct dma_chan *chan)
879{
880 struct edma_chan *echan = to_edma_chan(chan);
881
882 vchan_synchronize(&echan->vchan);
883}
884
Maxime Ripardaa7c09b2014-11-17 14:42:13 +0100885static int edma_slave_config(struct dma_chan *chan,
Matt Porter661f7cb2013-01-10 13:41:04 -0500886 struct dma_slave_config *cfg)
Matt Porterc2dde5f2012-08-22 21:09:34 -0400887{
Maxime Ripardaa7c09b2014-11-17 14:42:13 +0100888 struct edma_chan *echan = to_edma_chan(chan);
889
Matt Porter661f7cb2013-01-10 13:41:04 -0500890 if (cfg->src_addr_width == DMA_SLAVE_BUSWIDTH_8_BYTES ||
891 cfg->dst_addr_width == DMA_SLAVE_BUSWIDTH_8_BYTES)
Matt Porterc2dde5f2012-08-22 21:09:34 -0400892 return -EINVAL;
893
Matt Porter661f7cb2013-01-10 13:41:04 -0500894 memcpy(&echan->cfg, cfg, sizeof(echan->cfg));
Matt Porterc2dde5f2012-08-22 21:09:34 -0400895
896 return 0;
897}
898
Maxime Ripardaa7c09b2014-11-17 14:42:13 +0100899static int edma_dma_pause(struct dma_chan *chan)
Peter Ujfalusi72c7b672014-04-14 14:41:59 +0300900{
Maxime Ripardaa7c09b2014-11-17 14:42:13 +0100901 struct edma_chan *echan = to_edma_chan(chan);
902
John Ogness02ec6042015-04-27 13:52:25 +0200903 if (!echan->edesc)
Peter Ujfalusi72c7b672014-04-14 14:41:59 +0300904 return -EINVAL;
905
Peter Ujfalusi34cf3012015-10-16 10:18:01 +0300906 edma_pause(echan);
Peter Ujfalusi72c7b672014-04-14 14:41:59 +0300907 return 0;
908}
909
Maxime Ripardaa7c09b2014-11-17 14:42:13 +0100910static int edma_dma_resume(struct dma_chan *chan)
Peter Ujfalusi72c7b672014-04-14 14:41:59 +0300911{
Maxime Ripardaa7c09b2014-11-17 14:42:13 +0100912 struct edma_chan *echan = to_edma_chan(chan);
913
Peter Ujfalusi34cf3012015-10-16 10:18:01 +0300914 edma_resume(echan);
Peter Ujfalusi72c7b672014-04-14 14:41:59 +0300915 return 0;
916}
917
Joel Fernandesfd009032013-09-23 18:05:13 -0500918/*
919 * A PaRAM set configuration abstraction used by other modes
920 * @chan: Channel who's PaRAM set we're configuring
921 * @pset: PaRAM set to initialize and setup.
922 * @src_addr: Source address of the DMA
923 * @dst_addr: Destination address of the DMA
924 * @burst: In units of dev_width, how much to send
925 * @dev_width: How much is the dev_width
926 * @dma_length: Total length of the DMA transfer
927 * @direction: Direction of the transfer
928 */
Thomas Gleixnerb5088ad2014-04-28 14:23:55 -0500929static int edma_config_pset(struct dma_chan *chan, struct edma_pset *epset,
Peter Ujfalusi2b6b3b72015-10-14 14:42:53 +0300930 dma_addr_t src_addr, dma_addr_t dst_addr, u32 burst,
Peter Ujfalusidf6694f2015-10-16 10:18:00 +0300931 unsigned int acnt, unsigned int dma_length,
Peter Ujfalusi2b6b3b72015-10-14 14:42:53 +0300932 enum dma_transfer_direction direction)
Joel Fernandesfd009032013-09-23 18:05:13 -0500933{
934 struct edma_chan *echan = to_edma_chan(chan);
935 struct device *dev = chan->device->dev;
Thomas Gleixnerb5088ad2014-04-28 14:23:55 -0500936 struct edmacc_param *param = &epset->param;
Peter Ujfalusidf6694f2015-10-16 10:18:00 +0300937 int bcnt, ccnt, cidx;
Joel Fernandesfd009032013-09-23 18:05:13 -0500938 int src_bidx, dst_bidx, src_cidx, dst_cidx;
939 int absync;
940
Peter Ujfalusib2b617d2014-04-14 14:41:58 +0300941 /* src/dst_maxburst == 0 is the same case as src/dst_maxburst == 1 */
942 if (!burst)
943 burst = 1;
Joel Fernandesfd009032013-09-23 18:05:13 -0500944 /*
945 * If the maxburst is equal to the fifo width, use
946 * A-synced transfers. This allows for large contiguous
947 * buffer transfers using only one PaRAM set.
948 */
949 if (burst == 1) {
950 /*
951 * For the A-sync case, bcnt and ccnt are the remainder
952 * and quotient respectively of the division of:
953 * (dma_length / acnt) by (SZ_64K -1). This is so
954 * that in case bcnt over flows, we have ccnt to use.
955 * Note: In A-sync tranfer only, bcntrld is used, but it
956 * only applies for sg_dma_len(sg) >= SZ_64K.
957 * In this case, the best way adopted is- bccnt for the
958 * first frame will be the remainder below. Then for
959 * every successive frame, bcnt will be SZ_64K-1. This
960 * is assured as bcntrld = 0xffff in end of function.
961 */
962 absync = false;
963 ccnt = dma_length / acnt / (SZ_64K - 1);
964 bcnt = dma_length / acnt - ccnt * (SZ_64K - 1);
965 /*
966 * If bcnt is non-zero, we have a remainder and hence an
967 * extra frame to transfer, so increment ccnt.
968 */
969 if (bcnt)
970 ccnt++;
971 else
972 bcnt = SZ_64K - 1;
973 cidx = acnt;
974 } else {
975 /*
976 * If maxburst is greater than the fifo address_width,
977 * use AB-synced transfers where A count is the fifo
978 * address_width and B count is the maxburst. In this
979 * case, we are limited to transfers of C count frames
980 * of (address_width * maxburst) where C count is limited
981 * to SZ_64K-1. This places an upper bound on the length
982 * of an SG segment that can be handled.
983 */
984 absync = true;
985 bcnt = burst;
986 ccnt = dma_length / (acnt * bcnt);
987 if (ccnt > (SZ_64K - 1)) {
988 dev_err(dev, "Exceeded max SG segment size\n");
989 return -EINVAL;
990 }
991 cidx = acnt * bcnt;
992 }
993
Thomas Gleixnerc2da2342014-04-28 14:29:57 -0500994 epset->len = dma_length;
995
Joel Fernandesfd009032013-09-23 18:05:13 -0500996 if (direction == DMA_MEM_TO_DEV) {
997 src_bidx = acnt;
998 src_cidx = cidx;
999 dst_bidx = 0;
1000 dst_cidx = 0;
Thomas Gleixnerc2da2342014-04-28 14:29:57 -05001001 epset->addr = src_addr;
Joel Fernandesfd009032013-09-23 18:05:13 -05001002 } else if (direction == DMA_DEV_TO_MEM) {
1003 src_bidx = 0;
1004 src_cidx = 0;
1005 dst_bidx = acnt;
1006 dst_cidx = cidx;
Thomas Gleixnerc2da2342014-04-28 14:29:57 -05001007 epset->addr = dst_addr;
Joel Fernandes8cc3e302014-04-18 21:50:33 -05001008 } else if (direction == DMA_MEM_TO_MEM) {
1009 src_bidx = acnt;
1010 src_cidx = cidx;
1011 dst_bidx = acnt;
1012 dst_cidx = cidx;
Joel Fernandesfd009032013-09-23 18:05:13 -05001013 } else {
1014 dev_err(dev, "%s: direction not implemented yet\n", __func__);
1015 return -EINVAL;
1016 }
1017
Thomas Gleixnerb5088ad2014-04-28 14:23:55 -05001018 param->opt = EDMA_TCC(EDMA_CHAN_SLOT(echan->ch_num));
Joel Fernandesfd009032013-09-23 18:05:13 -05001019 /* Configure A or AB synchronized transfers */
1020 if (absync)
Thomas Gleixnerb5088ad2014-04-28 14:23:55 -05001021 param->opt |= SYNCDIM;
Joel Fernandesfd009032013-09-23 18:05:13 -05001022
Thomas Gleixnerb5088ad2014-04-28 14:23:55 -05001023 param->src = src_addr;
1024 param->dst = dst_addr;
Joel Fernandesfd009032013-09-23 18:05:13 -05001025
Thomas Gleixnerb5088ad2014-04-28 14:23:55 -05001026 param->src_dst_bidx = (dst_bidx << 16) | src_bidx;
1027 param->src_dst_cidx = (dst_cidx << 16) | src_cidx;
Joel Fernandesfd009032013-09-23 18:05:13 -05001028
Thomas Gleixnerb5088ad2014-04-28 14:23:55 -05001029 param->a_b_cnt = bcnt << 16 | acnt;
1030 param->ccnt = ccnt;
Joel Fernandesfd009032013-09-23 18:05:13 -05001031 /*
1032 * Only time when (bcntrld) auto reload is required is for
1033 * A-sync case, and in this case, a requirement of reload value
1034 * of SZ_64K-1 only is assured. 'link' is initially set to NULL
1035 * and then later will be populated by edma_execute.
1036 */
Thomas Gleixnerb5088ad2014-04-28 14:23:55 -05001037 param->link_bcntrld = 0xffffffff;
Joel Fernandesfd009032013-09-23 18:05:13 -05001038 return absync;
1039}
1040
Matt Porterc2dde5f2012-08-22 21:09:34 -04001041static struct dma_async_tx_descriptor *edma_prep_slave_sg(
1042 struct dma_chan *chan, struct scatterlist *sgl,
1043 unsigned int sg_len, enum dma_transfer_direction direction,
1044 unsigned long tx_flags, void *context)
1045{
1046 struct edma_chan *echan = to_edma_chan(chan);
1047 struct device *dev = chan->device->dev;
1048 struct edma_desc *edesc;
Joel Fernandesfd009032013-09-23 18:05:13 -05001049 dma_addr_t src_addr = 0, dst_addr = 0;
Matt Porter661f7cb2013-01-10 13:41:04 -05001050 enum dma_slave_buswidth dev_width;
1051 u32 burst;
Matt Porterc2dde5f2012-08-22 21:09:34 -04001052 struct scatterlist *sg;
Joel Fernandesfd009032013-09-23 18:05:13 -05001053 int i, nslots, ret;
Matt Porterc2dde5f2012-08-22 21:09:34 -04001054
1055 if (unlikely(!echan || !sgl || !sg_len))
1056 return NULL;
1057
Matt Porter661f7cb2013-01-10 13:41:04 -05001058 if (direction == DMA_DEV_TO_MEM) {
Joel Fernandesfd009032013-09-23 18:05:13 -05001059 src_addr = echan->cfg.src_addr;
Matt Porter661f7cb2013-01-10 13:41:04 -05001060 dev_width = echan->cfg.src_addr_width;
1061 burst = echan->cfg.src_maxburst;
1062 } else if (direction == DMA_MEM_TO_DEV) {
Joel Fernandesfd009032013-09-23 18:05:13 -05001063 dst_addr = echan->cfg.dst_addr;
Matt Porter661f7cb2013-01-10 13:41:04 -05001064 dev_width = echan->cfg.dst_addr_width;
1065 burst = echan->cfg.dst_maxburst;
1066 } else {
Peter Ujfalusie6fad592014-04-14 14:42:05 +03001067 dev_err(dev, "%s: bad direction: %d\n", __func__, direction);
Matt Porter661f7cb2013-01-10 13:41:04 -05001068 return NULL;
1069 }
1070
1071 if (dev_width == DMA_SLAVE_BUSWIDTH_UNDEFINED) {
Peter Ujfalusic594c892014-04-14 14:42:03 +03001072 dev_err(dev, "%s: Undefined slave buswidth\n", __func__);
Matt Porterc2dde5f2012-08-22 21:09:34 -04001073 return NULL;
1074 }
1075
Peter Ujfalusi2b6b3b72015-10-14 14:42:53 +03001076 edesc = kzalloc(sizeof(*edesc) + sg_len * sizeof(edesc->pset[0]),
1077 GFP_ATOMIC);
Peter Griffinaef94fe2016-06-07 18:38:41 +01001078 if (!edesc)
Matt Porterc2dde5f2012-08-22 21:09:34 -04001079 return NULL;
Matt Porterc2dde5f2012-08-22 21:09:34 -04001080
1081 edesc->pset_nr = sg_len;
Thomas Gleixnerb6205c32014-04-28 14:18:45 -05001082 edesc->residue = 0;
Thomas Gleixnerc2da2342014-04-28 14:29:57 -05001083 edesc->direction = direction;
Thomas Gleixner740b41f2014-04-28 14:34:11 -05001084 edesc->echan = echan;
Matt Porterc2dde5f2012-08-22 21:09:34 -04001085
Joel Fernandes6fbe24d2013-08-29 18:05:40 -05001086 /* Allocate a PaRAM slot, if needed */
1087 nslots = min_t(unsigned, MAX_NR_SG, sg_len);
1088
1089 for (i = 0; i < nslots; i++) {
Matt Porterc2dde5f2012-08-22 21:09:34 -04001090 if (echan->slot[i] < 0) {
1091 echan->slot[i] =
Peter Ujfalusi2b6b3b72015-10-14 14:42:53 +03001092 edma_alloc_slot(echan->ecc, EDMA_SLOT_ANY);
Matt Porterc2dde5f2012-08-22 21:09:34 -04001093 if (echan->slot[i] < 0) {
Valentin Ilie4b6271a2013-10-24 16:14:22 +03001094 kfree(edesc);
Peter Ujfalusic594c892014-04-14 14:42:03 +03001095 dev_err(dev, "%s: Failed to allocate slot\n",
1096 __func__);
Matt Porterc2dde5f2012-08-22 21:09:34 -04001097 return NULL;
1098 }
1099 }
Joel Fernandes6fbe24d2013-08-29 18:05:40 -05001100 }
1101
1102 /* Configure PaRAM sets for each SG */
1103 for_each_sg(sgl, sg, sg_len, i) {
Joel Fernandesfd009032013-09-23 18:05:13 -05001104 /* Get address for each SG */
1105 if (direction == DMA_DEV_TO_MEM)
1106 dst_addr = sg_dma_address(sg);
1107 else
1108 src_addr = sg_dma_address(sg);
Matt Porterc2dde5f2012-08-22 21:09:34 -04001109
Joel Fernandesfd009032013-09-23 18:05:13 -05001110 ret = edma_config_pset(chan, &edesc->pset[i], src_addr,
1111 dst_addr, burst, dev_width,
1112 sg_dma_len(sg), direction);
Vinod Koulb967aec2013-10-30 13:07:18 +05301113 if (ret < 0) {
1114 kfree(edesc);
Joel Fernandesfd009032013-09-23 18:05:13 -05001115 return NULL;
Matt Porterc2dde5f2012-08-22 21:09:34 -04001116 }
1117
Joel Fernandesfd009032013-09-23 18:05:13 -05001118 edesc->absync = ret;
Thomas Gleixnerb6205c32014-04-28 14:18:45 -05001119 edesc->residue += sg_dma_len(sg);
Joel Fernandes6fbe24d2013-08-29 18:05:40 -05001120
Matt Porterc2dde5f2012-08-22 21:09:34 -04001121 if (i == sg_len - 1)
Peter Ujfalusi2e4ed082016-06-07 11:19:44 +03001122 /* Enable completion interrupt */
Thomas Gleixnerb5088ad2014-04-28 14:23:55 -05001123 edesc->pset[i].param.opt |= TCINTEN;
Peter Ujfalusi2e4ed082016-06-07 11:19:44 +03001124 else if (!((i+1) % MAX_NR_SG))
1125 /*
1126 * Enable early completion interrupt for the
1127 * intermediateset. In this case the driver will be
1128 * notified when the paRAM set is submitted to TC. This
1129 * will allow more time to set up the next set of slots.
1130 */
1131 edesc->pset[i].param.opt |= (TCINTEN | TCCMODE);
Matt Porterc2dde5f2012-08-22 21:09:34 -04001132 }
Thomas Gleixner740b41f2014-04-28 14:34:11 -05001133 edesc->residue_stat = edesc->residue;
Matt Porterc2dde5f2012-08-22 21:09:34 -04001134
Matt Porterc2dde5f2012-08-22 21:09:34 -04001135 return vchan_tx_prep(&echan->vchan, &edesc->vdesc, tx_flags);
1136}
Matt Porterc2dde5f2012-08-22 21:09:34 -04001137
Lad, Prabhakarb7a4fd52015-02-04 13:03:27 +00001138static struct dma_async_tx_descriptor *edma_prep_dma_memcpy(
Joel Fernandes8cc3e302014-04-18 21:50:33 -05001139 struct dma_chan *chan, dma_addr_t dest, dma_addr_t src,
1140 size_t len, unsigned long tx_flags)
1141{
Peter Ujfalusidf6694f2015-10-16 10:18:00 +03001142 int ret, nslots;
Joel Fernandes8cc3e302014-04-18 21:50:33 -05001143 struct edma_desc *edesc;
1144 struct device *dev = chan->device->dev;
1145 struct edma_chan *echan = to_edma_chan(chan);
Peter Ujfalusidf6694f2015-10-16 10:18:00 +03001146 unsigned int width, pset_len;
Joel Fernandes8cc3e302014-04-18 21:50:33 -05001147
1148 if (unlikely(!echan || !len))
1149 return NULL;
1150
Peter Ujfalusidf6694f2015-10-16 10:18:00 +03001151 if (len < SZ_64K) {
1152 /*
1153 * Transfer size less than 64K can be handled with one paRAM
1154 * slot and with one burst.
1155 * ACNT = length
1156 */
1157 width = len;
1158 pset_len = len;
1159 nslots = 1;
1160 } else {
1161 /*
1162 * Transfer size bigger than 64K will be handled with maximum of
1163 * two paRAM slots.
1164 * slot1: (full_length / 32767) times 32767 bytes bursts.
1165 * ACNT = 32767, length1: (full_length / 32767) * 32767
1166 * slot2: the remaining amount of data after slot1.
1167 * ACNT = full_length - length1, length2 = ACNT
1168 *
1169 * When the full_length is multibple of 32767 one slot can be
1170 * used to complete the transfer.
1171 */
1172 width = SZ_32K - 1;
1173 pset_len = rounddown(len, width);
1174 /* One slot is enough for lengths multiple of (SZ_32K -1) */
1175 if (unlikely(pset_len == len))
1176 nslots = 1;
1177 else
1178 nslots = 2;
1179 }
1180
1181 edesc = kzalloc(sizeof(*edesc) + nslots * sizeof(edesc->pset[0]),
1182 GFP_ATOMIC);
Peter Griffinaef94fe2016-06-07 18:38:41 +01001183 if (!edesc)
Joel Fernandes8cc3e302014-04-18 21:50:33 -05001184 return NULL;
Joel Fernandes8cc3e302014-04-18 21:50:33 -05001185
Peter Ujfalusidf6694f2015-10-16 10:18:00 +03001186 edesc->pset_nr = nslots;
1187 edesc->residue = edesc->residue_stat = len;
1188 edesc->direction = DMA_MEM_TO_MEM;
1189 edesc->echan = echan;
Peter Ujfalusi21a31842015-10-16 10:17:59 +03001190
Joel Fernandes8cc3e302014-04-18 21:50:33 -05001191 ret = edma_config_pset(chan, &edesc->pset[0], src, dest, 1,
Peter Ujfalusidf6694f2015-10-16 10:18:00 +03001192 width, pset_len, DMA_MEM_TO_MEM);
1193 if (ret < 0) {
1194 kfree(edesc);
Joel Fernandes8cc3e302014-04-18 21:50:33 -05001195 return NULL;
Peter Ujfalusidf6694f2015-10-16 10:18:00 +03001196 }
Joel Fernandes8cc3e302014-04-18 21:50:33 -05001197
1198 edesc->absync = ret;
1199
Joel Fernandesb0cce4c2014-04-28 15:30:32 -05001200 edesc->pset[0].param.opt |= ITCCHEN;
Peter Ujfalusidf6694f2015-10-16 10:18:00 +03001201 if (nslots == 1) {
1202 /* Enable transfer complete interrupt */
1203 edesc->pset[0].param.opt |= TCINTEN;
1204 } else {
1205 /* Enable transfer complete chaining for the first slot */
1206 edesc->pset[0].param.opt |= TCCHEN;
1207
1208 if (echan->slot[1] < 0) {
1209 echan->slot[1] = edma_alloc_slot(echan->ecc,
1210 EDMA_SLOT_ANY);
1211 if (echan->slot[1] < 0) {
1212 kfree(edesc);
1213 dev_err(dev, "%s: Failed to allocate slot\n",
1214 __func__);
1215 return NULL;
1216 }
1217 }
1218 dest += pset_len;
1219 src += pset_len;
1220 pset_len = width = len % (SZ_32K - 1);
1221
1222 ret = edma_config_pset(chan, &edesc->pset[1], src, dest, 1,
1223 width, pset_len, DMA_MEM_TO_MEM);
1224 if (ret < 0) {
1225 kfree(edesc);
1226 return NULL;
1227 }
1228
1229 edesc->pset[1].param.opt |= ITCCHEN;
1230 edesc->pset[1].param.opt |= TCINTEN;
1231 }
Joel Fernandes8cc3e302014-04-18 21:50:33 -05001232
1233 return vchan_tx_prep(&echan->vchan, &edesc->vdesc, tx_flags);
1234}
1235
Joel Fernandes50a9c702013-10-31 16:31:23 -05001236static struct dma_async_tx_descriptor *edma_prep_dma_cyclic(
1237 struct dma_chan *chan, dma_addr_t buf_addr, size_t buf_len,
1238 size_t period_len, enum dma_transfer_direction direction,
Laurent Pinchart31c1e5a2014-08-01 12:20:10 +02001239 unsigned long tx_flags)
Joel Fernandes50a9c702013-10-31 16:31:23 -05001240{
1241 struct edma_chan *echan = to_edma_chan(chan);
1242 struct device *dev = chan->device->dev;
1243 struct edma_desc *edesc;
1244 dma_addr_t src_addr, dst_addr;
1245 enum dma_slave_buswidth dev_width;
John Ognessa482f4e2016-04-06 13:01:47 +03001246 bool use_intermediate = false;
Joel Fernandes50a9c702013-10-31 16:31:23 -05001247 u32 burst;
1248 int i, ret, nslots;
Matt Porterc2dde5f2012-08-22 21:09:34 -04001249
Joel Fernandes50a9c702013-10-31 16:31:23 -05001250 if (unlikely(!echan || !buf_len || !period_len))
1251 return NULL;
Matt Porterc2dde5f2012-08-22 21:09:34 -04001252
Joel Fernandes50a9c702013-10-31 16:31:23 -05001253 if (direction == DMA_DEV_TO_MEM) {
1254 src_addr = echan->cfg.src_addr;
1255 dst_addr = buf_addr;
1256 dev_width = echan->cfg.src_addr_width;
1257 burst = echan->cfg.src_maxburst;
1258 } else if (direction == DMA_MEM_TO_DEV) {
1259 src_addr = buf_addr;
1260 dst_addr = echan->cfg.dst_addr;
1261 dev_width = echan->cfg.dst_addr_width;
1262 burst = echan->cfg.dst_maxburst;
1263 } else {
Peter Ujfalusie6fad592014-04-14 14:42:05 +03001264 dev_err(dev, "%s: bad direction: %d\n", __func__, direction);
Joel Fernandes50a9c702013-10-31 16:31:23 -05001265 return NULL;
1266 }
1267
1268 if (dev_width == DMA_SLAVE_BUSWIDTH_UNDEFINED) {
Peter Ujfalusic594c892014-04-14 14:42:03 +03001269 dev_err(dev, "%s: Undefined slave buswidth\n", __func__);
Joel Fernandes50a9c702013-10-31 16:31:23 -05001270 return NULL;
1271 }
1272
1273 if (unlikely(buf_len % period_len)) {
1274 dev_err(dev, "Period should be multiple of Buffer length\n");
1275 return NULL;
1276 }
1277
1278 nslots = (buf_len / period_len) + 1;
1279
1280 /*
1281 * Cyclic DMA users such as audio cannot tolerate delays introduced
1282 * by cases where the number of periods is more than the maximum
1283 * number of SGs the EDMA driver can handle at a time. For DMA types
1284 * such as Slave SGs, such delays are tolerable and synchronized,
1285 * but the synchronization is difficult to achieve with Cyclic and
1286 * cannot be guaranteed, so we error out early.
1287 */
John Ognessa482f4e2016-04-06 13:01:47 +03001288 if (nslots > MAX_NR_SG) {
1289 /*
1290 * If the burst and period sizes are the same, we can put
1291 * the full buffer into a single period and activate
1292 * intermediate interrupts. This will produce interrupts
1293 * after each burst, which is also after each desired period.
1294 */
1295 if (burst == period_len) {
1296 period_len = buf_len;
1297 nslots = 2;
1298 use_intermediate = true;
1299 } else {
1300 return NULL;
1301 }
1302 }
Joel Fernandes50a9c702013-10-31 16:31:23 -05001303
Peter Ujfalusi2b6b3b72015-10-14 14:42:53 +03001304 edesc = kzalloc(sizeof(*edesc) + nslots * sizeof(edesc->pset[0]),
1305 GFP_ATOMIC);
Peter Griffinaef94fe2016-06-07 18:38:41 +01001306 if (!edesc)
Joel Fernandes50a9c702013-10-31 16:31:23 -05001307 return NULL;
Joel Fernandes50a9c702013-10-31 16:31:23 -05001308
1309 edesc->cyclic = 1;
1310 edesc->pset_nr = nslots;
Thomas Gleixner740b41f2014-04-28 14:34:11 -05001311 edesc->residue = edesc->residue_stat = buf_len;
Thomas Gleixnerc2da2342014-04-28 14:29:57 -05001312 edesc->direction = direction;
Thomas Gleixner740b41f2014-04-28 14:34:11 -05001313 edesc->echan = echan;
Joel Fernandes50a9c702013-10-31 16:31:23 -05001314
Peter Ujfalusi83bb3122014-04-14 14:42:02 +03001315 dev_dbg(dev, "%s: channel=%d nslots=%d period_len=%zu buf_len=%zu\n",
1316 __func__, echan->ch_num, nslots, period_len, buf_len);
Joel Fernandes50a9c702013-10-31 16:31:23 -05001317
1318 for (i = 0; i < nslots; i++) {
1319 /* Allocate a PaRAM slot, if needed */
1320 if (echan->slot[i] < 0) {
1321 echan->slot[i] =
Peter Ujfalusi2b6b3b72015-10-14 14:42:53 +03001322 edma_alloc_slot(echan->ecc, EDMA_SLOT_ANY);
Joel Fernandes50a9c702013-10-31 16:31:23 -05001323 if (echan->slot[i] < 0) {
Christian Engelmayere3ddc972013-12-30 20:48:39 +01001324 kfree(edesc);
Peter Ujfalusic594c892014-04-14 14:42:03 +03001325 dev_err(dev, "%s: Failed to allocate slot\n",
1326 __func__);
Joel Fernandes50a9c702013-10-31 16:31:23 -05001327 return NULL;
1328 }
1329 }
1330
1331 if (i == nslots - 1) {
1332 memcpy(&edesc->pset[i], &edesc->pset[0],
1333 sizeof(edesc->pset[0]));
1334 break;
1335 }
1336
1337 ret = edma_config_pset(chan, &edesc->pset[i], src_addr,
1338 dst_addr, burst, dev_width, period_len,
1339 direction);
Christian Engelmayere3ddc972013-12-30 20:48:39 +01001340 if (ret < 0) {
1341 kfree(edesc);
Joel Fernandes50a9c702013-10-31 16:31:23 -05001342 return NULL;
Christian Engelmayere3ddc972013-12-30 20:48:39 +01001343 }
Joel Fernandes50a9c702013-10-31 16:31:23 -05001344
1345 if (direction == DMA_DEV_TO_MEM)
1346 dst_addr += period_len;
1347 else
1348 src_addr += period_len;
1349
Peter Ujfalusi83bb3122014-04-14 14:42:02 +03001350 dev_vdbg(dev, "%s: Configure period %d of buf:\n", __func__, i);
1351 dev_vdbg(dev,
Joel Fernandes50a9c702013-10-31 16:31:23 -05001352 "\n pset[%d]:\n"
1353 " chnum\t%d\n"
1354 " slot\t%d\n"
1355 " opt\t%08x\n"
1356 " src\t%08x\n"
1357 " dst\t%08x\n"
1358 " abcnt\t%08x\n"
1359 " ccnt\t%08x\n"
1360 " bidx\t%08x\n"
1361 " cidx\t%08x\n"
1362 " lkrld\t%08x\n",
1363 i, echan->ch_num, echan->slot[i],
Thomas Gleixnerb5088ad2014-04-28 14:23:55 -05001364 edesc->pset[i].param.opt,
1365 edesc->pset[i].param.src,
1366 edesc->pset[i].param.dst,
1367 edesc->pset[i].param.a_b_cnt,
1368 edesc->pset[i].param.ccnt,
1369 edesc->pset[i].param.src_dst_bidx,
1370 edesc->pset[i].param.src_dst_cidx,
1371 edesc->pset[i].param.link_bcntrld);
Joel Fernandes50a9c702013-10-31 16:31:23 -05001372
1373 edesc->absync = ret;
1374
1375 /*
Peter Ujfalusia1f146f2014-07-16 15:29:21 +03001376 * Enable period interrupt only if it is requested
Joel Fernandes50a9c702013-10-31 16:31:23 -05001377 */
John Ognessa482f4e2016-04-06 13:01:47 +03001378 if (tx_flags & DMA_PREP_INTERRUPT) {
Peter Ujfalusia1f146f2014-07-16 15:29:21 +03001379 edesc->pset[i].param.opt |= TCINTEN;
John Ognessa482f4e2016-04-06 13:01:47 +03001380
1381 /* Also enable intermediate interrupts if necessary */
1382 if (use_intermediate)
1383 edesc->pset[i].param.opt |= ITCINTEN;
1384 }
Matt Porterc2dde5f2012-08-22 21:09:34 -04001385 }
1386
Peter Ujfalusi8e8805d2014-07-08 13:46:38 +03001387 /* Place the cyclic channel to highest priority queue */
Peter Ujfalusi1be53362015-10-16 10:18:10 +03001388 if (!echan->tc)
1389 edma_assign_channel_eventq(echan, EVENTQ_0);
Peter Ujfalusi8e8805d2014-07-08 13:46:38 +03001390
Matt Porterc2dde5f2012-08-22 21:09:34 -04001391 return vchan_tx_prep(&echan->vchan, &edesc->vdesc, tx_flags);
1392}
1393
Peter Ujfalusi79ad2e32015-10-14 14:43:01 +03001394static void edma_completion_handler(struct edma_chan *echan)
Matt Porterc2dde5f2012-08-22 21:09:34 -04001395{
Matt Porterc2dde5f2012-08-22 21:09:34 -04001396 struct device *dev = echan->vchan.chan.device->dev;
Peter Ujfalusie4d88172016-02-11 15:17:48 +02001397 struct edma_desc *edesc;
Joel Fernandes50a9c702013-10-31 16:31:23 -05001398
Peter Ujfalusi8fa7ff42015-10-14 14:42:45 +03001399 spin_lock(&echan->vchan.lock);
Peter Ujfalusie4d88172016-02-11 15:17:48 +02001400 edesc = echan->edesc;
1401 if (edesc) {
1402 if (edesc->cyclic) {
1403 vchan_cyclic_callback(&edesc->vdesc);
1404 spin_unlock(&echan->vchan.lock);
1405 return;
1406 } else if (edesc->processed == edesc->pset_nr) {
1407 edesc->residue = 0;
1408 edma_stop(echan);
1409 vchan_cookie_complete(&edesc->vdesc);
1410 echan->edesc = NULL;
Thomas Gleixner740b41f2014-04-28 14:34:11 -05001411
Peter Ujfalusie4d88172016-02-11 15:17:48 +02001412 dev_dbg(dev, "Transfer completed on channel %d\n",
1413 echan->ch_num);
1414 } else {
1415 dev_dbg(dev, "Sub transfer completed on channel %d\n",
1416 echan->ch_num);
Peter Ujfalusi8fa7ff42015-10-14 14:42:45 +03001417
Peter Ujfalusie4d88172016-02-11 15:17:48 +02001418 edma_pause(echan);
Joel Fernandesc5f47992013-08-29 18:05:43 -05001419
Peter Ujfalusie4d88172016-02-11 15:17:48 +02001420 /* Update statistics for tx_status */
1421 edesc->residue -= edesc->sg_len;
1422 edesc->residue_stat = edesc->residue;
1423 edesc->processed_stat = edesc->processed;
1424 }
1425 edma_execute(echan);
Matt Porterc2dde5f2012-08-22 21:09:34 -04001426 }
Peter Ujfalusi79ad2e32015-10-14 14:43:01 +03001427
Peter Ujfalusi8fa7ff42015-10-14 14:42:45 +03001428 spin_unlock(&echan->vchan.lock);
Matt Porterc2dde5f2012-08-22 21:09:34 -04001429}
1430
Peter Ujfalusi79ad2e32015-10-14 14:43:01 +03001431/* eDMA interrupt handler */
1432static irqreturn_t dma_irq_handler(int irq, void *data)
1433{
1434 struct edma_cc *ecc = data;
1435 int ctlr;
1436 u32 sh_ier;
1437 u32 sh_ipr;
1438 u32 bank;
1439
1440 ctlr = ecc->id;
1441 if (ctlr < 0)
1442 return IRQ_NONE;
1443
1444 dev_vdbg(ecc->dev, "dma_irq_handler\n");
1445
1446 sh_ipr = edma_shadow0_read_array(ecc, SH_IPR, 0);
1447 if (!sh_ipr) {
1448 sh_ipr = edma_shadow0_read_array(ecc, SH_IPR, 1);
1449 if (!sh_ipr)
1450 return IRQ_NONE;
1451 sh_ier = edma_shadow0_read_array(ecc, SH_IER, 1);
1452 bank = 1;
1453 } else {
1454 sh_ier = edma_shadow0_read_array(ecc, SH_IER, 0);
1455 bank = 0;
1456 }
1457
1458 do {
1459 u32 slot;
1460 u32 channel;
1461
1462 slot = __ffs(sh_ipr);
1463 sh_ipr &= ~(BIT(slot));
1464
1465 if (sh_ier & BIT(slot)) {
1466 channel = (bank << 5) | slot;
1467 /* Clear the corresponding IPR bits */
1468 edma_shadow0_write_array(ecc, SH_ICR, bank, BIT(slot));
1469 edma_completion_handler(&ecc->slave_chans[channel]);
1470 }
1471 } while (sh_ipr);
1472
1473 edma_shadow0_write(ecc, SH_IEVAL, 1);
1474 return IRQ_HANDLED;
1475}
1476
1477static void edma_error_handler(struct edma_chan *echan)
1478{
1479 struct edma_cc *ecc = echan->ecc;
1480 struct device *dev = echan->vchan.chan.device->dev;
1481 struct edmacc_param p;
Arnd Bergmann2cc40ee2016-09-30 18:19:01 +02001482 int err;
Peter Ujfalusi79ad2e32015-10-14 14:43:01 +03001483
1484 if (!echan->edesc)
1485 return;
1486
1487 spin_lock(&echan->vchan.lock);
1488
Arnd Bergmann2cc40ee2016-09-30 18:19:01 +02001489 err = edma_read_slot(ecc, echan->slot[0], &p);
1490
Peter Ujfalusi79ad2e32015-10-14 14:43:01 +03001491 /*
1492 * Issue later based on missed flag which will be sure
1493 * to happen as:
1494 * (1) we finished transmitting an intermediate slot and
1495 * edma_execute is coming up.
1496 * (2) or we finished current transfer and issue will
1497 * call edma_execute.
1498 *
1499 * Important note: issuing can be dangerous here and
1500 * lead to some nasty recursion when we are in a NULL
1501 * slot. So we avoid doing so and set the missed flag.
1502 */
Arnd Bergmann2cc40ee2016-09-30 18:19:01 +02001503 if (err || (p.a_b_cnt == 0 && p.ccnt == 0)) {
Peter Ujfalusi79ad2e32015-10-14 14:43:01 +03001504 dev_dbg(dev, "Error on null slot, setting miss\n");
1505 echan->missed = 1;
1506 } else {
1507 /*
1508 * The slot is already programmed but the event got
1509 * missed, so its safe to issue it here.
1510 */
1511 dev_dbg(dev, "Missed event, TRIGGERING\n");
Peter Ujfalusi34cf3012015-10-16 10:18:01 +03001512 edma_clean_channel(echan);
1513 edma_stop(echan);
1514 edma_start(echan);
1515 edma_trigger_channel(echan);
Peter Ujfalusi79ad2e32015-10-14 14:43:01 +03001516 }
1517 spin_unlock(&echan->vchan.lock);
1518}
1519
Peter Ujfalusi7c3b8b32015-10-14 14:43:02 +03001520static inline bool edma_error_pending(struct edma_cc *ecc)
1521{
1522 if (edma_read_array(ecc, EDMA_EMR, 0) ||
1523 edma_read_array(ecc, EDMA_EMR, 1) ||
1524 edma_read(ecc, EDMA_QEMR) || edma_read(ecc, EDMA_CCERR))
1525 return true;
1526
1527 return false;
1528}
1529
Peter Ujfalusi79ad2e32015-10-14 14:43:01 +03001530/* eDMA error interrupt handler */
1531static irqreturn_t dma_ccerr_handler(int irq, void *data)
1532{
1533 struct edma_cc *ecc = data;
Peter Ujfalusie4402a12015-10-14 14:43:03 +03001534 int i, j;
Peter Ujfalusi79ad2e32015-10-14 14:43:01 +03001535 int ctlr;
1536 unsigned int cnt = 0;
Peter Ujfalusie4402a12015-10-14 14:43:03 +03001537 unsigned int val;
Peter Ujfalusi79ad2e32015-10-14 14:43:01 +03001538
1539 ctlr = ecc->id;
1540 if (ctlr < 0)
1541 return IRQ_NONE;
1542
1543 dev_vdbg(ecc->dev, "dma_ccerr_handler\n");
1544
Peter Ujfalusi3b2bc8a2016-05-10 13:40:54 +03001545 if (!edma_error_pending(ecc)) {
1546 /*
1547 * The registers indicate no pending error event but the irq
1548 * handler has been called.
1549 * Ask eDMA to re-evaluate the error registers.
1550 */
1551 dev_err(ecc->dev, "%s: Error interrupt without error event!\n",
1552 __func__);
1553 edma_write(ecc, EDMA_EEVAL, 1);
Peter Ujfalusi79ad2e32015-10-14 14:43:01 +03001554 return IRQ_NONE;
Peter Ujfalusi3b2bc8a2016-05-10 13:40:54 +03001555 }
Peter Ujfalusi79ad2e32015-10-14 14:43:01 +03001556
1557 while (1) {
Peter Ujfalusie4402a12015-10-14 14:43:03 +03001558 /* Event missed register(s) */
1559 for (j = 0; j < 2; j++) {
1560 unsigned long emr;
Peter Ujfalusi79ad2e32015-10-14 14:43:01 +03001561
Peter Ujfalusie4402a12015-10-14 14:43:03 +03001562 val = edma_read_array(ecc, EDMA_EMR, j);
1563 if (!val)
1564 continue;
1565
1566 dev_dbg(ecc->dev, "EMR%d 0x%08x\n", j, val);
1567 emr = val;
1568 for (i = find_next_bit(&emr, 32, 0); i < 32;
1569 i = find_next_bit(&emr, 32, i + 1)) {
Peter Ujfalusi79ad2e32015-10-14 14:43:01 +03001570 int k = (j << 5) + i;
1571
Peter Ujfalusie4402a12015-10-14 14:43:03 +03001572 /* Clear the corresponding EMR bits */
1573 edma_write_array(ecc, EDMA_EMCR, j, BIT(i));
1574 /* Clear any SER */
1575 edma_shadow0_write_array(ecc, SH_SECR, j,
Peter Ujfalusi79ad2e32015-10-14 14:43:01 +03001576 BIT(i));
Peter Ujfalusie4402a12015-10-14 14:43:03 +03001577 edma_error_handler(&ecc->slave_chans[k]);
Peter Ujfalusi79ad2e32015-10-14 14:43:01 +03001578 }
1579 }
Peter Ujfalusie4402a12015-10-14 14:43:03 +03001580
1581 val = edma_read(ecc, EDMA_QEMR);
1582 if (val) {
1583 dev_dbg(ecc->dev, "QEMR 0x%02x\n", val);
1584 /* Not reported, just clear the interrupt reason. */
1585 edma_write(ecc, EDMA_QEMCR, val);
1586 edma_shadow0_write(ecc, SH_QSECR, val);
1587 }
1588
1589 val = edma_read(ecc, EDMA_CCERR);
1590 if (val) {
1591 dev_warn(ecc->dev, "CCERR 0x%08x\n", val);
1592 /* Not reported, just clear the interrupt reason. */
1593 edma_write(ecc, EDMA_CCERRCLR, val);
1594 }
1595
Peter Ujfalusi7c3b8b32015-10-14 14:43:02 +03001596 if (!edma_error_pending(ecc))
Peter Ujfalusi79ad2e32015-10-14 14:43:01 +03001597 break;
1598 cnt++;
1599 if (cnt > 10)
1600 break;
1601 }
1602 edma_write(ecc, EDMA_EEVAL, 1);
1603 return IRQ_HANDLED;
1604}
1605
Matt Porterc2dde5f2012-08-22 21:09:34 -04001606/* Alloc channel resources */
1607static int edma_alloc_chan_resources(struct dma_chan *chan)
1608{
1609 struct edma_chan *echan = to_edma_chan(chan);
Peter Ujfalusi1be53362015-10-16 10:18:10 +03001610 struct edma_cc *ecc = echan->ecc;
1611 struct device *dev = ecc->dev;
1612 enum dma_event_q eventq_no = EVENTQ_DEFAULT;
Matt Porterc2dde5f2012-08-22 21:09:34 -04001613 int ret;
Matt Porterc2dde5f2012-08-22 21:09:34 -04001614
Peter Ujfalusi1be53362015-10-16 10:18:10 +03001615 if (echan->tc) {
1616 eventq_no = echan->tc->id;
1617 } else if (ecc->tc_list) {
1618 /* memcpy channel */
1619 echan->tc = &ecc->tc_list[ecc->info->default_queue];
1620 eventq_no = echan->tc->id;
1621 }
1622
1623 ret = edma_alloc_channel(echan, eventq_no);
Peter Ujfalusi34cf3012015-10-16 10:18:01 +03001624 if (ret)
1625 return ret;
Matt Porterc2dde5f2012-08-22 21:09:34 -04001626
Peter Ujfalusi1be53362015-10-16 10:18:10 +03001627 echan->slot[0] = edma_alloc_slot(ecc, echan->ch_num);
Peter Ujfalusie4e886c2015-10-14 14:43:06 +03001628 if (echan->slot[0] < 0) {
1629 dev_err(dev, "Entry slot allocation failed for channel %u\n",
1630 EDMA_CHAN_SLOT(echan->ch_num));
Peter Ujfalusi34cf3012015-10-16 10:18:01 +03001631 goto err_slot;
Peter Ujfalusie4e886c2015-10-14 14:43:06 +03001632 }
1633
1634 /* Set up channel -> slot mapping for the entry slot */
Peter Ujfalusi34cf3012015-10-16 10:18:01 +03001635 edma_set_chmap(echan, echan->slot[0]);
1636 echan->alloced = true;
Matt Porterc2dde5f2012-08-22 21:09:34 -04001637
Peter Ujfalusi1be53362015-10-16 10:18:10 +03001638 dev_dbg(dev, "Got eDMA channel %d for virt channel %d (%s trigger)\n",
1639 EDMA_CHAN_SLOT(echan->ch_num), chan->chan_id,
1640 echan->hw_triggered ? "HW" : "SW");
1641
Matt Porterc2dde5f2012-08-22 21:09:34 -04001642 return 0;
1643
Peter Ujfalusi34cf3012015-10-16 10:18:01 +03001644err_slot:
1645 edma_free_channel(echan);
Matt Porterc2dde5f2012-08-22 21:09:34 -04001646 return ret;
1647}
1648
1649/* Free channel resources */
1650static void edma_free_chan_resources(struct dma_chan *chan)
1651{
1652 struct edma_chan *echan = to_edma_chan(chan);
Peter Ujfalusi1be53362015-10-16 10:18:10 +03001653 struct device *dev = echan->ecc->dev;
Matt Porterc2dde5f2012-08-22 21:09:34 -04001654 int i;
1655
1656 /* Terminate transfers */
Peter Ujfalusi34cf3012015-10-16 10:18:01 +03001657 edma_stop(echan);
Matt Porterc2dde5f2012-08-22 21:09:34 -04001658
1659 vchan_free_chan_resources(&echan->vchan);
1660
1661 /* Free EDMA PaRAM slots */
Peter Ujfalusie4e886c2015-10-14 14:43:06 +03001662 for (i = 0; i < EDMA_MAX_SLOTS; i++) {
Matt Porterc2dde5f2012-08-22 21:09:34 -04001663 if (echan->slot[i] >= 0) {
Peter Ujfalusi2b6b3b72015-10-14 14:42:53 +03001664 edma_free_slot(echan->ecc, echan->slot[i]);
Matt Porterc2dde5f2012-08-22 21:09:34 -04001665 echan->slot[i] = -1;
1666 }
1667 }
1668
Peter Ujfalusie4e886c2015-10-14 14:43:06 +03001669 /* Set entry slot to the dummy slot */
Peter Ujfalusi34cf3012015-10-16 10:18:01 +03001670 edma_set_chmap(echan, echan->ecc->dummy_slot);
Peter Ujfalusie4e886c2015-10-14 14:43:06 +03001671
Matt Porterc2dde5f2012-08-22 21:09:34 -04001672 /* Free EDMA channel */
1673 if (echan->alloced) {
Peter Ujfalusi34cf3012015-10-16 10:18:01 +03001674 edma_free_channel(echan);
Matt Porterc2dde5f2012-08-22 21:09:34 -04001675 echan->alloced = false;
1676 }
1677
Peter Ujfalusi1be53362015-10-16 10:18:10 +03001678 echan->tc = NULL;
1679 echan->hw_triggered = false;
1680
1681 dev_dbg(dev, "Free eDMA channel %d for virt channel %d\n",
1682 EDMA_CHAN_SLOT(echan->ch_num), chan->chan_id);
Matt Porterc2dde5f2012-08-22 21:09:34 -04001683}
1684
1685/* Send pending descriptor to hardware */
1686static void edma_issue_pending(struct dma_chan *chan)
1687{
1688 struct edma_chan *echan = to_edma_chan(chan);
1689 unsigned long flags;
1690
1691 spin_lock_irqsave(&echan->vchan.lock, flags);
1692 if (vchan_issue_pending(&echan->vchan) && !echan->edesc)
1693 edma_execute(echan);
1694 spin_unlock_irqrestore(&echan->vchan.lock, flags);
1695}
1696
John Ogness4ac31d12016-01-28 11:29:08 +01001697/*
1698 * This limit exists to avoid a possible infinite loop when waiting for proof
1699 * that a particular transfer is completed. This limit can be hit if there
1700 * are large bursts to/from slow devices or the CPU is never able to catch
1701 * the DMA hardware idle. On an AM335x transfering 48 bytes from the UART
1702 * RX-FIFO, as many as 55 loops have been seen.
1703 */
1704#define EDMA_MAX_TR_WAIT_LOOPS 1000
1705
Thomas Gleixner740b41f2014-04-28 14:34:11 -05001706static u32 edma_residue(struct edma_desc *edesc)
1707{
1708 bool dst = edesc->direction == DMA_DEV_TO_MEM;
John Ogness4ac31d12016-01-28 11:29:08 +01001709 int loop_count = EDMA_MAX_TR_WAIT_LOOPS;
1710 struct edma_chan *echan = edesc->echan;
Thomas Gleixner740b41f2014-04-28 14:34:11 -05001711 struct edma_pset *pset = edesc->pset;
1712 dma_addr_t done, pos;
1713 int i;
1714
1715 /*
1716 * We always read the dst/src position from the first RamPar
1717 * pset. That's the one which is active now.
1718 */
John Ogness4ac31d12016-01-28 11:29:08 +01001719 pos = edma_get_position(echan->ecc, echan->slot[0], dst);
1720
1721 /*
1722 * "pos" may represent a transfer request that is still being
1723 * processed by the EDMACC or EDMATC. We will busy wait until
1724 * any one of the situations occurs:
1725 * 1. the DMA hardware is idle
1726 * 2. a new transfer request is setup
1727 * 3. we hit the loop limit
1728 */
1729 while (edma_read(echan->ecc, EDMA_CCSTAT) & EDMA_CCSTAT_ACTV) {
1730 /* check if a new transfer request is setup */
1731 if (edma_get_position(echan->ecc,
1732 echan->slot[0], dst) != pos) {
1733 break;
1734 }
1735
1736 if (!--loop_count) {
1737 dev_dbg_ratelimited(echan->vchan.chan.device->dev,
1738 "%s: timeout waiting for PaRAM update\n",
1739 __func__);
1740 break;
1741 }
1742
1743 cpu_relax();
1744 }
Thomas Gleixner740b41f2014-04-28 14:34:11 -05001745
1746 /*
1747 * Cyclic is simple. Just subtract pset[0].addr from pos.
1748 *
1749 * We never update edesc->residue in the cyclic case, so we
1750 * can tell the remaining room to the end of the circular
1751 * buffer.
1752 */
1753 if (edesc->cyclic) {
1754 done = pos - pset->addr;
1755 edesc->residue_stat = edesc->residue - done;
1756 return edesc->residue_stat;
1757 }
1758
1759 /*
1760 * For SG operation we catch up with the last processed
1761 * status.
1762 */
1763 pset += edesc->processed_stat;
1764
1765 for (i = edesc->processed_stat; i < edesc->processed; i++, pset++) {
1766 /*
1767 * If we are inside this pset address range, we know
1768 * this is the active one. Get the current delta and
1769 * stop walking the psets.
1770 */
1771 if (pos >= pset->addr && pos < pset->addr + pset->len)
1772 return edesc->residue_stat - (pos - pset->addr);
1773
1774 /* Otherwise mark it done and update residue_stat. */
1775 edesc->processed_stat++;
1776 edesc->residue_stat -= pset->len;
1777 }
1778 return edesc->residue_stat;
1779}
1780
Matt Porterc2dde5f2012-08-22 21:09:34 -04001781/* Check request completion status */
1782static enum dma_status edma_tx_status(struct dma_chan *chan,
1783 dma_cookie_t cookie,
1784 struct dma_tx_state *txstate)
1785{
1786 struct edma_chan *echan = to_edma_chan(chan);
1787 struct virt_dma_desc *vdesc;
1788 enum dma_status ret;
1789 unsigned long flags;
1790
1791 ret = dma_cookie_status(chan, cookie, txstate);
Vinod Koul9d386ec2013-10-16 13:42:15 +05301792 if (ret == DMA_COMPLETE || !txstate)
Matt Porterc2dde5f2012-08-22 21:09:34 -04001793 return ret;
1794
1795 spin_lock_irqsave(&echan->vchan.lock, flags);
Thomas Gleixnerde135932014-04-28 14:19:51 -05001796 if (echan->edesc && echan->edesc->vdesc.tx.cookie == cookie)
Thomas Gleixner740b41f2014-04-28 14:34:11 -05001797 txstate->residue = edma_residue(echan->edesc);
Thomas Gleixnerde135932014-04-28 14:19:51 -05001798 else if ((vdesc = vchan_find_desc(&echan->vchan, cookie)))
1799 txstate->residue = to_edma_desc(&vdesc->tx)->residue;
Matt Porterc2dde5f2012-08-22 21:09:34 -04001800 spin_unlock_irqrestore(&echan->vchan.lock, flags);
1801
1802 return ret;
1803}
1804
Peter Ujfalusiecb7dec2015-12-09 10:18:10 +02001805static bool edma_is_memcpy_channel(int ch_num, s32 *memcpy_channels)
Peter Ujfalusi1be53362015-10-16 10:18:10 +03001806{
Peter Ujfalusi1be53362015-10-16 10:18:10 +03001807 if (!memcpy_channels)
1808 return false;
Peter Ujfalusiecb7dec2015-12-09 10:18:10 +02001809 while (*memcpy_channels != -1) {
1810 if (*memcpy_channels == ch_num)
Peter Ujfalusi1be53362015-10-16 10:18:10 +03001811 return true;
Peter Ujfalusiecb7dec2015-12-09 10:18:10 +02001812 memcpy_channels++;
Peter Ujfalusi1be53362015-10-16 10:18:10 +03001813 }
1814 return false;
1815}
1816
Peter Ujfalusi2c88ee62014-04-14 14:42:01 +03001817#define EDMA_DMA_BUSWIDTHS (BIT(DMA_SLAVE_BUSWIDTH_1_BYTE) | \
1818 BIT(DMA_SLAVE_BUSWIDTH_2_BYTES) | \
Peter Ujfalusie4a899d2014-07-03 07:51:56 +03001819 BIT(DMA_SLAVE_BUSWIDTH_3_BYTES) | \
Peter Ujfalusi2c88ee62014-04-14 14:42:01 +03001820 BIT(DMA_SLAVE_BUSWIDTH_4_BYTES))
1821
Peter Ujfalusi1be53362015-10-16 10:18:10 +03001822static void edma_dma_init(struct edma_cc *ecc, bool legacy_mode)
Matt Porterc2dde5f2012-08-22 21:09:34 -04001823{
Peter Ujfalusi1be53362015-10-16 10:18:10 +03001824 struct dma_device *s_ddev = &ecc->dma_slave;
1825 struct dma_device *m_ddev = NULL;
Peter Ujfalusiecb7dec2015-12-09 10:18:10 +02001826 s32 *memcpy_channels = ecc->info->memcpy_channels;
Peter Ujfalusi02f77ef2015-10-16 10:18:05 +03001827 int i, j;
Maxime Ripard9f59cd02014-11-17 14:42:47 +01001828
Peter Ujfalusi1be53362015-10-16 10:18:10 +03001829 dma_cap_zero(s_ddev->cap_mask);
1830 dma_cap_set(DMA_SLAVE, s_ddev->cap_mask);
1831 dma_cap_set(DMA_CYCLIC, s_ddev->cap_mask);
1832 if (ecc->legacy_mode && !memcpy_channels) {
1833 dev_warn(ecc->dev,
1834 "Legacy memcpy is enabled, things might not work\n");
Maxime Ripard9f59cd02014-11-17 14:42:47 +01001835
Peter Ujfalusi1be53362015-10-16 10:18:10 +03001836 dma_cap_set(DMA_MEMCPY, s_ddev->cap_mask);
1837 s_ddev->device_prep_dma_memcpy = edma_prep_dma_memcpy;
1838 s_ddev->directions = BIT(DMA_MEM_TO_MEM);
1839 }
Matt Porterc2dde5f2012-08-22 21:09:34 -04001840
Peter Ujfalusi1be53362015-10-16 10:18:10 +03001841 s_ddev->device_prep_slave_sg = edma_prep_slave_sg;
1842 s_ddev->device_prep_dma_cyclic = edma_prep_dma_cyclic;
1843 s_ddev->device_alloc_chan_resources = edma_alloc_chan_resources;
1844 s_ddev->device_free_chan_resources = edma_free_chan_resources;
1845 s_ddev->device_issue_pending = edma_issue_pending;
1846 s_ddev->device_tx_status = edma_tx_status;
1847 s_ddev->device_config = edma_slave_config;
1848 s_ddev->device_pause = edma_dma_pause;
1849 s_ddev->device_resume = edma_dma_resume;
1850 s_ddev->device_terminate_all = edma_terminate_all;
Peter Ujfalusib84730f2016-02-11 11:08:42 +02001851 s_ddev->device_synchronize = edma_synchronize;
Peter Ujfalusi02f77ef2015-10-16 10:18:05 +03001852
Peter Ujfalusi1be53362015-10-16 10:18:10 +03001853 s_ddev->src_addr_widths = EDMA_DMA_BUSWIDTHS;
1854 s_ddev->dst_addr_widths = EDMA_DMA_BUSWIDTHS;
1855 s_ddev->directions |= (BIT(DMA_DEV_TO_MEM) | BIT(DMA_MEM_TO_DEV));
1856 s_ddev->residue_granularity = DMA_RESIDUE_GRANULARITY_BURST;
Peter Ujfalusi02f77ef2015-10-16 10:18:05 +03001857
Peter Ujfalusi1be53362015-10-16 10:18:10 +03001858 s_ddev->dev = ecc->dev;
1859 INIT_LIST_HEAD(&s_ddev->channels);
1860
1861 if (memcpy_channels) {
1862 m_ddev = devm_kzalloc(ecc->dev, sizeof(*m_ddev), GFP_KERNEL);
1863 ecc->dma_memcpy = m_ddev;
1864
1865 dma_cap_zero(m_ddev->cap_mask);
1866 dma_cap_set(DMA_MEMCPY, m_ddev->cap_mask);
1867
1868 m_ddev->device_prep_dma_memcpy = edma_prep_dma_memcpy;
1869 m_ddev->device_alloc_chan_resources = edma_alloc_chan_resources;
1870 m_ddev->device_free_chan_resources = edma_free_chan_resources;
1871 m_ddev->device_issue_pending = edma_issue_pending;
1872 m_ddev->device_tx_status = edma_tx_status;
1873 m_ddev->device_config = edma_slave_config;
1874 m_ddev->device_pause = edma_dma_pause;
1875 m_ddev->device_resume = edma_dma_resume;
1876 m_ddev->device_terminate_all = edma_terminate_all;
Peter Ujfalusib84730f2016-02-11 11:08:42 +02001877 m_ddev->device_synchronize = edma_synchronize;
Peter Ujfalusi1be53362015-10-16 10:18:10 +03001878
1879 m_ddev->src_addr_widths = EDMA_DMA_BUSWIDTHS;
1880 m_ddev->dst_addr_widths = EDMA_DMA_BUSWIDTHS;
1881 m_ddev->directions = BIT(DMA_MEM_TO_MEM);
1882 m_ddev->residue_granularity = DMA_RESIDUE_GRANULARITY_BURST;
1883
1884 m_ddev->dev = ecc->dev;
1885 INIT_LIST_HEAD(&m_ddev->channels);
1886 } else if (!ecc->legacy_mode) {
1887 dev_info(ecc->dev, "memcpy is disabled\n");
1888 }
Peter Ujfalusi02f77ef2015-10-16 10:18:05 +03001889
1890 for (i = 0; i < ecc->num_channels; i++) {
1891 struct edma_chan *echan = &ecc->slave_chans[i];
1892 echan->ch_num = EDMA_CTLR_CHAN(ecc->id, i);
1893 echan->ecc = ecc;
1894 echan->vchan.desc_free = edma_desc_free;
1895
Peter Ujfalusi1be53362015-10-16 10:18:10 +03001896 if (m_ddev && edma_is_memcpy_channel(i, memcpy_channels))
1897 vchan_init(&echan->vchan, m_ddev);
1898 else
1899 vchan_init(&echan->vchan, s_ddev);
Peter Ujfalusi02f77ef2015-10-16 10:18:05 +03001900
1901 INIT_LIST_HEAD(&echan->node);
1902 for (j = 0; j < EDMA_MAX_SLOTS; j++)
1903 echan->slot[j] = -1;
1904 }
Matt Porterc2dde5f2012-08-22 21:09:34 -04001905}
1906
Peter Ujfalusi2b6b3b72015-10-14 14:42:53 +03001907static int edma_setup_from_hw(struct device *dev, struct edma_soc_info *pdata,
1908 struct edma_cc *ecc)
1909{
1910 int i;
1911 u32 value, cccfg;
1912 s8 (*queue_priority_map)[2];
1913
1914 /* Decode the eDMA3 configuration from CCCFG register */
1915 cccfg = edma_read(ecc, EDMA_CCCFG);
1916
1917 value = GET_NUM_REGN(cccfg);
1918 ecc->num_region = BIT(value);
1919
1920 value = GET_NUM_DMACH(cccfg);
1921 ecc->num_channels = BIT(value + 1);
1922
Peter Ujfalusi633e42b2015-10-16 10:18:04 +03001923 value = GET_NUM_QDMACH(cccfg);
1924 ecc->num_qchannels = value * 2;
1925
Peter Ujfalusi2b6b3b72015-10-14 14:42:53 +03001926 value = GET_NUM_PAENTRY(cccfg);
1927 ecc->num_slots = BIT(value + 4);
1928
1929 value = GET_NUM_EVQUE(cccfg);
1930 ecc->num_tc = value + 1;
1931
Peter Ujfalusi4ab54f62015-10-14 14:43:04 +03001932 ecc->chmap_exist = (cccfg & CHMAP_EXIST) ? true : false;
1933
Peter Ujfalusi2b6b3b72015-10-14 14:42:53 +03001934 dev_dbg(dev, "eDMA3 CC HW configuration (cccfg: 0x%08x):\n", cccfg);
1935 dev_dbg(dev, "num_region: %u\n", ecc->num_region);
1936 dev_dbg(dev, "num_channels: %u\n", ecc->num_channels);
Peter Ujfalusi633e42b2015-10-16 10:18:04 +03001937 dev_dbg(dev, "num_qchannels: %u\n", ecc->num_qchannels);
Peter Ujfalusi2b6b3b72015-10-14 14:42:53 +03001938 dev_dbg(dev, "num_slots: %u\n", ecc->num_slots);
1939 dev_dbg(dev, "num_tc: %u\n", ecc->num_tc);
Peter Ujfalusi4ab54f62015-10-14 14:43:04 +03001940 dev_dbg(dev, "chmap_exist: %s\n", ecc->chmap_exist ? "yes" : "no");
Peter Ujfalusi2b6b3b72015-10-14 14:42:53 +03001941
1942 /* Nothing need to be done if queue priority is provided */
1943 if (pdata->queue_priority_mapping)
1944 return 0;
1945
1946 /*
1947 * Configure TC/queue priority as follows:
1948 * Q0 - priority 0
1949 * Q1 - priority 1
1950 * Q2 - priority 2
1951 * ...
1952 * The meaning of priority numbers: 0 highest priority, 7 lowest
1953 * priority. So Q0 is the highest priority queue and the last queue has
1954 * the lowest priority.
1955 */
Peter Ujfalusi547c6e22015-10-14 14:42:55 +03001956 queue_priority_map = devm_kcalloc(dev, ecc->num_tc + 1, sizeof(s8),
Peter Ujfalusi2b6b3b72015-10-14 14:42:53 +03001957 GFP_KERNEL);
1958 if (!queue_priority_map)
1959 return -ENOMEM;
1960
1961 for (i = 0; i < ecc->num_tc; i++) {
1962 queue_priority_map[i][0] = i;
1963 queue_priority_map[i][1] = i;
1964 }
1965 queue_priority_map[i][0] = -1;
1966 queue_priority_map[i][1] = -1;
1967
1968 pdata->queue_priority_mapping = queue_priority_map;
1969 /* Default queue has the lowest priority */
1970 pdata->default_queue = i - 1;
1971
1972 return 0;
1973}
1974
1975#if IS_ENABLED(CONFIG_OF)
1976static int edma_xbar_event_map(struct device *dev, struct edma_soc_info *pdata,
1977 size_t sz)
1978{
1979 const char pname[] = "ti,edma-xbar-event-map";
1980 struct resource res;
1981 void __iomem *xbar;
1982 s16 (*xbar_chans)[2];
1983 size_t nelm = sz / sizeof(s16);
1984 u32 shift, offset, mux;
1985 int ret, i;
1986
Peter Ujfalusi547c6e22015-10-14 14:42:55 +03001987 xbar_chans = devm_kcalloc(dev, nelm + 2, sizeof(s16), GFP_KERNEL);
Peter Ujfalusi2b6b3b72015-10-14 14:42:53 +03001988 if (!xbar_chans)
1989 return -ENOMEM;
1990
1991 ret = of_address_to_resource(dev->of_node, 1, &res);
1992 if (ret)
1993 return -ENOMEM;
1994
1995 xbar = devm_ioremap(dev, res.start, resource_size(&res));
1996 if (!xbar)
1997 return -ENOMEM;
1998
1999 ret = of_property_read_u16_array(dev->of_node, pname, (u16 *)xbar_chans,
2000 nelm);
2001 if (ret)
2002 return -EIO;
2003
2004 /* Invalidate last entry for the other user of this mess */
2005 nelm >>= 1;
2006 xbar_chans[nelm][0] = -1;
2007 xbar_chans[nelm][1] = -1;
2008
2009 for (i = 0; i < nelm; i++) {
2010 shift = (xbar_chans[i][1] & 0x03) << 3;
2011 offset = xbar_chans[i][1] & 0xfffffffc;
2012 mux = readl(xbar + offset);
2013 mux &= ~(0xff << shift);
2014 mux |= xbar_chans[i][0] << shift;
2015 writel(mux, (xbar + offset));
2016 }
2017
2018 pdata->xbar_chans = (const s16 (*)[2]) xbar_chans;
2019 return 0;
2020}
2021
Peter Ujfalusi1be53362015-10-16 10:18:10 +03002022static struct edma_soc_info *edma_setup_info_from_dt(struct device *dev,
2023 bool legacy_mode)
Peter Ujfalusi2b6b3b72015-10-14 14:42:53 +03002024{
2025 struct edma_soc_info *info;
Peter Ujfalusi966a87b2015-10-16 10:18:07 +03002026 struct property *prop;
Peter Ujfalusif1d1e342016-09-21 15:41:29 +03002027 int sz, ret;
Peter Ujfalusi2b6b3b72015-10-14 14:42:53 +03002028
2029 info = devm_kzalloc(dev, sizeof(struct edma_soc_info), GFP_KERNEL);
2030 if (!info)
2031 return ERR_PTR(-ENOMEM);
2032
Peter Ujfalusi1be53362015-10-16 10:18:10 +03002033 if (legacy_mode) {
2034 prop = of_find_property(dev->of_node, "ti,edma-xbar-event-map",
2035 &sz);
2036 if (prop) {
2037 ret = edma_xbar_event_map(dev, info, sz);
2038 if (ret)
2039 return ERR_PTR(ret);
2040 }
2041 return info;
2042 }
2043
2044 /* Get the list of channels allocated to be used for memcpy */
2045 prop = of_find_property(dev->of_node, "ti,edma-memcpy-channels", &sz);
Peter Ujfalusi966a87b2015-10-16 10:18:07 +03002046 if (prop) {
Peter Ujfalusi1be53362015-10-16 10:18:10 +03002047 const char pname[] = "ti,edma-memcpy-channels";
Peter Ujfalusiecb7dec2015-12-09 10:18:10 +02002048 size_t nelm = sz / sizeof(s32);
2049 s32 *memcpy_ch;
Peter Ujfalusi1be53362015-10-16 10:18:10 +03002050
Peter Ujfalusiecb7dec2015-12-09 10:18:10 +02002051 memcpy_ch = devm_kcalloc(dev, nelm + 1, sizeof(s32),
Peter Ujfalusi1be53362015-10-16 10:18:10 +03002052 GFP_KERNEL);
2053 if (!memcpy_ch)
2054 return ERR_PTR(-ENOMEM);
2055
Peter Ujfalusiecb7dec2015-12-09 10:18:10 +02002056 ret = of_property_read_u32_array(dev->of_node, pname,
2057 (u32 *)memcpy_ch, nelm);
Peter Ujfalusi966a87b2015-10-16 10:18:07 +03002058 if (ret)
2059 return ERR_PTR(ret);
Peter Ujfalusi1be53362015-10-16 10:18:10 +03002060
2061 memcpy_ch[nelm] = -1;
2062 info->memcpy_channels = memcpy_ch;
2063 }
2064
2065 prop = of_find_property(dev->of_node, "ti,edma-reserved-slot-ranges",
2066 &sz);
2067 if (prop) {
2068 const char pname[] = "ti,edma-reserved-slot-ranges";
Peter Ujfalusiae0add72015-12-09 10:18:11 +02002069 u32 (*tmp)[2];
Peter Ujfalusi1be53362015-10-16 10:18:10 +03002070 s16 (*rsv_slots)[2];
Peter Ujfalusiae0add72015-12-09 10:18:11 +02002071 size_t nelm = sz / sizeof(*tmp);
Peter Ujfalusi1be53362015-10-16 10:18:10 +03002072 struct edma_rsv_info *rsv_info;
Peter Ujfalusiae0add72015-12-09 10:18:11 +02002073 int i;
Peter Ujfalusi1be53362015-10-16 10:18:10 +03002074
2075 if (!nelm)
2076 return info;
2077
Peter Ujfalusiae0add72015-12-09 10:18:11 +02002078 tmp = kcalloc(nelm, sizeof(*tmp), GFP_KERNEL);
2079 if (!tmp)
Peter Ujfalusi1be53362015-10-16 10:18:10 +03002080 return ERR_PTR(-ENOMEM);
2081
Peter Ujfalusiae0add72015-12-09 10:18:11 +02002082 rsv_info = devm_kzalloc(dev, sizeof(*rsv_info), GFP_KERNEL);
2083 if (!rsv_info) {
2084 kfree(tmp);
2085 return ERR_PTR(-ENOMEM);
2086 }
2087
Peter Ujfalusi1be53362015-10-16 10:18:10 +03002088 rsv_slots = devm_kcalloc(dev, nelm + 1, sizeof(*rsv_slots),
2089 GFP_KERNEL);
Peter Ujfalusiae0add72015-12-09 10:18:11 +02002090 if (!rsv_slots) {
2091 kfree(tmp);
Peter Ujfalusi1be53362015-10-16 10:18:10 +03002092 return ERR_PTR(-ENOMEM);
Peter Ujfalusiae0add72015-12-09 10:18:11 +02002093 }
Peter Ujfalusi1be53362015-10-16 10:18:10 +03002094
Peter Ujfalusiae0add72015-12-09 10:18:11 +02002095 ret = of_property_read_u32_array(dev->of_node, pname,
2096 (u32 *)tmp, nelm * 2);
2097 if (ret) {
2098 kfree(tmp);
Peter Ujfalusi1be53362015-10-16 10:18:10 +03002099 return ERR_PTR(ret);
Peter Ujfalusiae0add72015-12-09 10:18:11 +02002100 }
Peter Ujfalusi1be53362015-10-16 10:18:10 +03002101
Peter Ujfalusiae0add72015-12-09 10:18:11 +02002102 for (i = 0; i < nelm; i++) {
2103 rsv_slots[i][0] = tmp[i][0];
2104 rsv_slots[i][1] = tmp[i][1];
2105 }
Peter Ujfalusi1be53362015-10-16 10:18:10 +03002106 rsv_slots[nelm][0] = -1;
2107 rsv_slots[nelm][1] = -1;
Peter Ujfalusiae0add72015-12-09 10:18:11 +02002108
Peter Ujfalusi1be53362015-10-16 10:18:10 +03002109 info->rsv = rsv_info;
2110 info->rsv->rsv_slots = (const s16 (*)[2])rsv_slots;
Peter Ujfalusiae0add72015-12-09 10:18:11 +02002111
2112 kfree(tmp);
Peter Ujfalusi966a87b2015-10-16 10:18:07 +03002113 }
Peter Ujfalusi2b6b3b72015-10-14 14:42:53 +03002114
2115 return info;
2116}
Peter Ujfalusi1be53362015-10-16 10:18:10 +03002117
2118static struct dma_chan *of_edma_xlate(struct of_phandle_args *dma_spec,
2119 struct of_dma *ofdma)
2120{
2121 struct edma_cc *ecc = ofdma->of_dma_data;
2122 struct dma_chan *chan = NULL;
2123 struct edma_chan *echan;
2124 int i;
2125
2126 if (!ecc || dma_spec->args_count < 1)
2127 return NULL;
2128
2129 for (i = 0; i < ecc->num_channels; i++) {
2130 echan = &ecc->slave_chans[i];
2131 if (echan->ch_num == dma_spec->args[0]) {
2132 chan = &echan->vchan.chan;
2133 break;
2134 }
2135 }
2136
2137 if (!chan)
2138 return NULL;
2139
2140 if (echan->ecc->legacy_mode && dma_spec->args_count == 1)
2141 goto out;
2142
2143 if (!echan->ecc->legacy_mode && dma_spec->args_count == 2 &&
2144 dma_spec->args[1] < echan->ecc->num_tc) {
2145 echan->tc = &echan->ecc->tc_list[dma_spec->args[1]];
2146 goto out;
2147 }
2148
2149 return NULL;
2150out:
2151 /* The channel is going to be used as HW synchronized */
2152 echan->hw_triggered = true;
2153 return dma_get_slave_channel(chan);
2154}
Peter Ujfalusi2b6b3b72015-10-14 14:42:53 +03002155#else
Peter Ujfalusi1be53362015-10-16 10:18:10 +03002156static struct edma_soc_info *edma_setup_info_from_dt(struct device *dev,
2157 bool legacy_mode)
Peter Ujfalusi2b6b3b72015-10-14 14:42:53 +03002158{
2159 return ERR_PTR(-EINVAL);
2160}
Peter Ujfalusi1be53362015-10-16 10:18:10 +03002161
2162static struct dma_chan *of_edma_xlate(struct of_phandle_args *dma_spec,
2163 struct of_dma *ofdma)
2164{
2165 return NULL;
2166}
Peter Ujfalusi2b6b3b72015-10-14 14:42:53 +03002167#endif
2168
Bill Pemberton463a1f82012-11-19 13:22:55 -05002169static int edma_probe(struct platform_device *pdev)
Matt Porterc2dde5f2012-08-22 21:09:34 -04002170{
Peter Ujfalusi2b6b3b72015-10-14 14:42:53 +03002171 struct edma_soc_info *info = pdev->dev.platform_data;
2172 s8 (*queue_priority_mapping)[2];
2173 int i, off, ln;
Peter Ujfalusi2b6b3b72015-10-14 14:42:53 +03002174 const s16 (*rsv_slots)[2];
2175 const s16 (*xbar_chans)[2];
2176 int irq;
2177 char *irq_name;
2178 struct resource *mem;
2179 struct device_node *node = pdev->dev.of_node;
2180 struct device *dev = &pdev->dev;
2181 struct edma_cc *ecc;
Peter Ujfalusi1be53362015-10-16 10:18:10 +03002182 bool legacy_mode = true;
Matt Porterc2dde5f2012-08-22 21:09:34 -04002183 int ret;
2184
Peter Ujfalusi2b6b3b72015-10-14 14:42:53 +03002185 if (node) {
Peter Ujfalusi1be53362015-10-16 10:18:10 +03002186 const struct of_device_id *match;
2187
2188 match = of_match_node(edma_of_ids, node);
Peter Ujfalusib7862742016-09-21 15:41:28 +03002189 if (match && (*(u32 *)match->data) == EDMA_BINDING_TPCC)
Peter Ujfalusi1be53362015-10-16 10:18:10 +03002190 legacy_mode = false;
2191
2192 info = edma_setup_info_from_dt(dev, legacy_mode);
Peter Ujfalusi2b6b3b72015-10-14 14:42:53 +03002193 if (IS_ERR(info)) {
2194 dev_err(dev, "failed to get DT data\n");
2195 return PTR_ERR(info);
2196 }
2197 }
2198
2199 if (!info)
2200 return -ENODEV;
2201
2202 pm_runtime_enable(dev);
2203 ret = pm_runtime_get_sync(dev);
2204 if (ret < 0) {
2205 dev_err(dev, "pm_runtime_get_sync() failed\n");
2206 return ret;
2207 }
2208
Peter Ujfalusi907f74a2015-10-14 14:42:56 +03002209 ret = dma_set_mask_and_coherent(dev, DMA_BIT_MASK(32));
Russell King94cb0e72013-06-27 13:45:16 +01002210 if (ret)
2211 return ret;
2212
Peter Ujfalusi907f74a2015-10-14 14:42:56 +03002213 ecc = devm_kzalloc(dev, sizeof(*ecc), GFP_KERNEL);
Peter Griffinaef94fe2016-06-07 18:38:41 +01002214 if (!ecc)
Matt Porterc2dde5f2012-08-22 21:09:34 -04002215 return -ENOMEM;
Matt Porterc2dde5f2012-08-22 21:09:34 -04002216
Peter Ujfalusi2b6b3b72015-10-14 14:42:53 +03002217 ecc->dev = dev;
2218 ecc->id = pdev->id;
Peter Ujfalusi1be53362015-10-16 10:18:10 +03002219 ecc->legacy_mode = legacy_mode;
Peter Ujfalusi2b6b3b72015-10-14 14:42:53 +03002220 /* When booting with DT the pdev->id is -1 */
2221 if (ecc->id < 0)
2222 ecc->id = 0;
Peter Ujfalusica304fa2015-10-14 14:42:49 +03002223
Peter Ujfalusi2b6b3b72015-10-14 14:42:53 +03002224 mem = platform_get_resource_byname(pdev, IORESOURCE_MEM, "edma3_cc");
2225 if (!mem) {
2226 dev_dbg(dev, "mem resource not found, using index 0\n");
2227 mem = platform_get_resource(pdev, IORESOURCE_MEM, 0);
2228 if (!mem) {
2229 dev_err(dev, "no mem resource?\n");
2230 return -ENODEV;
2231 }
2232 }
2233 ecc->base = devm_ioremap_resource(dev, mem);
2234 if (IS_ERR(ecc->base))
2235 return PTR_ERR(ecc->base);
Peter Ujfalusib2c843a2015-10-14 14:42:50 +03002236
Peter Ujfalusi2b6b3b72015-10-14 14:42:53 +03002237 platform_set_drvdata(pdev, ecc);
2238
2239 /* Get eDMA3 configuration from IP */
2240 ret = edma_setup_from_hw(dev, info, ecc);
2241 if (ret)
2242 return ret;
2243
Peter Ujfalusicb782052015-10-14 14:42:54 +03002244 /* Allocate memory based on the information we got from the IP */
2245 ecc->slave_chans = devm_kcalloc(dev, ecc->num_channels,
2246 sizeof(*ecc->slave_chans), GFP_KERNEL);
2247 if (!ecc->slave_chans)
2248 return -ENOMEM;
2249
Peter Ujfalusi7a73b132015-10-14 14:43:05 +03002250 ecc->slot_inuse = devm_kcalloc(dev, BITS_TO_LONGS(ecc->num_slots),
Peter Ujfalusicb782052015-10-14 14:42:54 +03002251 sizeof(unsigned long), GFP_KERNEL);
Peter Ujfalusi7a73b132015-10-14 14:43:05 +03002252 if (!ecc->slot_inuse)
Peter Ujfalusicb782052015-10-14 14:42:54 +03002253 return -ENOMEM;
2254
Peter Ujfalusi2b6b3b72015-10-14 14:42:53 +03002255 ecc->default_queue = info->default_queue;
2256
2257 for (i = 0; i < ecc->num_slots; i++)
2258 edma_write_slot(ecc, i, &dummy_paramset);
2259
Peter Ujfalusi2b6b3b72015-10-14 14:42:53 +03002260 if (info->rsv) {
Peter Ujfalusi2b6b3b72015-10-14 14:42:53 +03002261 /* Set the reserved slots in inuse list */
2262 rsv_slots = info->rsv->rsv_slots;
2263 if (rsv_slots) {
2264 for (i = 0; rsv_slots[i][0] != -1; i++) {
2265 off = rsv_slots[i][0];
2266 ln = rsv_slots[i][1];
Peter Ujfalusi1634d302016-09-22 09:31:04 +03002267 edma_set_bits(off, ln, ecc->slot_inuse);
Peter Ujfalusi2b6b3b72015-10-14 14:42:53 +03002268 }
2269 }
2270 }
2271
2272 /* Clear the xbar mapped channels in unused list */
2273 xbar_chans = info->xbar_chans;
2274 if (xbar_chans) {
2275 for (i = 0; xbar_chans[i][1] != -1; i++) {
2276 off = xbar_chans[i][1];
Peter Ujfalusi2b6b3b72015-10-14 14:42:53 +03002277 }
2278 }
2279
2280 irq = platform_get_irq_byname(pdev, "edma3_ccint");
2281 if (irq < 0 && node)
2282 irq = irq_of_parse_and_map(node, 0);
2283
2284 if (irq >= 0) {
2285 irq_name = devm_kasprintf(dev, GFP_KERNEL, "%s_ccint",
2286 dev_name(dev));
2287 ret = devm_request_irq(dev, irq, dma_irq_handler, 0, irq_name,
2288 ecc);
2289 if (ret) {
2290 dev_err(dev, "CCINT (%d) failed --> %d\n", irq, ret);
2291 return ret;
2292 }
Vinod Koul638001e2016-07-01 11:34:35 +05302293 ecc->ccint = irq;
Peter Ujfalusi2b6b3b72015-10-14 14:42:53 +03002294 }
2295
2296 irq = platform_get_irq_byname(pdev, "edma3_ccerrint");
2297 if (irq < 0 && node)
2298 irq = irq_of_parse_and_map(node, 2);
2299
2300 if (irq >= 0) {
2301 irq_name = devm_kasprintf(dev, GFP_KERNEL, "%s_ccerrint",
2302 dev_name(dev));
2303 ret = devm_request_irq(dev, irq, dma_ccerr_handler, 0, irq_name,
2304 ecc);
2305 if (ret) {
2306 dev_err(dev, "CCERRINT (%d) failed --> %d\n", irq, ret);
2307 return ret;
2308 }
Vinod Koul638001e2016-07-01 11:34:35 +05302309 ecc->ccerrint = irq;
Peter Ujfalusi2b6b3b72015-10-14 14:42:53 +03002310 }
2311
Peter Ujfalusie4e886c2015-10-14 14:43:06 +03002312 ecc->dummy_slot = edma_alloc_slot(ecc, EDMA_SLOT_ANY);
2313 if (ecc->dummy_slot < 0) {
2314 dev_err(dev, "Can't allocate PaRAM dummy slot\n");
2315 return ecc->dummy_slot;
2316 }
2317
Peter Ujfalusi2b6b3b72015-10-14 14:42:53 +03002318 queue_priority_mapping = info->queue_priority_mapping;
2319
Peter Ujfalusi1be53362015-10-16 10:18:10 +03002320 if (!ecc->legacy_mode) {
2321 int lowest_priority = 0;
2322 struct of_phandle_args tc_args;
2323
2324 ecc->tc_list = devm_kcalloc(dev, ecc->num_tc,
2325 sizeof(*ecc->tc_list), GFP_KERNEL);
2326 if (!ecc->tc_list)
2327 return -ENOMEM;
2328
2329 for (i = 0;; i++) {
2330 ret = of_parse_phandle_with_fixed_args(node, "ti,tptcs",
2331 1, i, &tc_args);
2332 if (ret || i == ecc->num_tc)
2333 break;
2334
2335 ecc->tc_list[i].node = tc_args.np;
2336 ecc->tc_list[i].id = i;
2337 queue_priority_mapping[i][1] = tc_args.args[0];
2338 if (queue_priority_mapping[i][1] > lowest_priority) {
2339 lowest_priority = queue_priority_mapping[i][1];
2340 info->default_queue = i;
2341 }
2342 }
2343 }
2344
Peter Ujfalusi2b6b3b72015-10-14 14:42:53 +03002345 /* Event queue priority mapping */
2346 for (i = 0; queue_priority_mapping[i][0] != -1; i++)
2347 edma_assign_priority_to_queue(ecc, queue_priority_mapping[i][0],
2348 queue_priority_mapping[i][1]);
2349
Peter Ujfalusi2b6b3b72015-10-14 14:42:53 +03002350 for (i = 0; i < ecc->num_region; i++) {
2351 edma_write_array2(ecc, EDMA_DRAE, i, 0, 0x0);
2352 edma_write_array2(ecc, EDMA_DRAE, i, 1, 0x0);
2353 edma_write_array(ecc, EDMA_QRAE, i, 0x0);
2354 }
2355 ecc->info = info;
2356
Peter Ujfalusi02f77ef2015-10-16 10:18:05 +03002357 /* Init the dma device and channels */
Peter Ujfalusi1be53362015-10-16 10:18:10 +03002358 edma_dma_init(ecc, legacy_mode);
Matt Porterc2dde5f2012-08-22 21:09:34 -04002359
Peter Ujfalusi34cf3012015-10-16 10:18:01 +03002360 for (i = 0; i < ecc->num_channels; i++) {
2361 /* Assign all channels to the default queue */
Peter Ujfalusif9425de2015-10-16 10:18:03 +03002362 edma_assign_channel_eventq(&ecc->slave_chans[i],
2363 info->default_queue);
Peter Ujfalusi34cf3012015-10-16 10:18:01 +03002364 /* Set entry slot to the dummy slot */
2365 edma_set_chmap(&ecc->slave_chans[i], ecc->dummy_slot);
2366 }
2367
Peter Ujfalusi23e67232015-12-14 22:47:41 +02002368 ecc->dma_slave.filter.map = info->slave_map;
2369 ecc->dma_slave.filter.mapcnt = info->slavecnt;
2370 ecc->dma_slave.filter.fn = edma_filter_fn;
2371
Matt Porterc2dde5f2012-08-22 21:09:34 -04002372 ret = dma_async_device_register(&ecc->dma_slave);
Peter Ujfalusi1be53362015-10-16 10:18:10 +03002373 if (ret) {
2374 dev_err(dev, "slave ddev registration failed (%d)\n", ret);
Matt Porterc2dde5f2012-08-22 21:09:34 -04002375 goto err_reg1;
Peter Ujfalusi1be53362015-10-16 10:18:10 +03002376 }
2377
2378 if (ecc->dma_memcpy) {
2379 ret = dma_async_device_register(ecc->dma_memcpy);
2380 if (ret) {
2381 dev_err(dev, "memcpy ddev registration failed (%d)\n",
2382 ret);
2383 dma_async_device_unregister(&ecc->dma_slave);
2384 goto err_reg1;
2385 }
2386 }
Matt Porterc2dde5f2012-08-22 21:09:34 -04002387
Peter Ujfalusi2b6b3b72015-10-14 14:42:53 +03002388 if (node)
Peter Ujfalusi1be53362015-10-16 10:18:10 +03002389 of_dma_controller_register(node, of_edma_xlate, ecc);
Peter Ujfalusidc9b60552015-10-14 14:42:47 +03002390
Peter Ujfalusi907f74a2015-10-14 14:42:56 +03002391 dev_info(dev, "TI EDMA DMA engine driver\n");
Matt Porterc2dde5f2012-08-22 21:09:34 -04002392
2393 return 0;
2394
2395err_reg1:
Peter Ujfalusi2b6b3b72015-10-14 14:42:53 +03002396 edma_free_slot(ecc, ecc->dummy_slot);
Matt Porterc2dde5f2012-08-22 21:09:34 -04002397 return ret;
2398}
2399
Vinod Koulf4e06282016-07-01 13:51:41 +05302400static void edma_cleanupp_vchan(struct dma_device *dmadev)
2401{
2402 struct edma_chan *echan, *_echan;
2403
2404 list_for_each_entry_safe(echan, _echan,
2405 &dmadev->channels, vchan.chan.device_node) {
2406 list_del(&echan->vchan.chan.device_node);
2407 tasklet_kill(&echan->vchan.task);
2408 }
2409}
2410
Greg Kroah-Hartman4bf27b82012-12-21 15:09:59 -08002411static int edma_remove(struct platform_device *pdev)
Matt Porterc2dde5f2012-08-22 21:09:34 -04002412{
2413 struct device *dev = &pdev->dev;
2414 struct edma_cc *ecc = dev_get_drvdata(dev);
2415
Vinod Koul638001e2016-07-01 11:34:35 +05302416 devm_free_irq(dev, ecc->ccint, ecc);
2417 devm_free_irq(dev, ecc->ccerrint, ecc);
2418
Vinod Koulf4e06282016-07-01 13:51:41 +05302419 edma_cleanupp_vchan(&ecc->dma_slave);
2420
Peter Ujfalusi907f74a2015-10-14 14:42:56 +03002421 if (dev->of_node)
2422 of_dma_controller_free(dev->of_node);
Matt Porterc2dde5f2012-08-22 21:09:34 -04002423 dma_async_device_unregister(&ecc->dma_slave);
Peter Ujfalusi1be53362015-10-16 10:18:10 +03002424 if (ecc->dma_memcpy)
2425 dma_async_device_unregister(ecc->dma_memcpy);
Peter Ujfalusi2b6b3b72015-10-14 14:42:53 +03002426 edma_free_slot(ecc, ecc->dummy_slot);
Matt Porterc2dde5f2012-08-22 21:09:34 -04002427
2428 return 0;
2429}
2430
Peter Ujfalusi2b6b3b72015-10-14 14:42:53 +03002431#ifdef CONFIG_PM_SLEEP
Peter Ujfalusi1be53362015-10-16 10:18:10 +03002432static int edma_pm_suspend(struct device *dev)
2433{
2434 struct edma_cc *ecc = dev_get_drvdata(dev);
2435 struct edma_chan *echan = ecc->slave_chans;
2436 int i;
2437
2438 for (i = 0; i < ecc->num_channels; i++) {
Peter Ujfalusi23f49fd2016-04-06 13:01:46 +03002439 if (echan[i].alloced)
Peter Ujfalusi1be53362015-10-16 10:18:10 +03002440 edma_setup_interrupt(&echan[i], false);
Peter Ujfalusi1be53362015-10-16 10:18:10 +03002441 }
2442
2443 return 0;
2444}
2445
Peter Ujfalusi2b6b3b72015-10-14 14:42:53 +03002446static int edma_pm_resume(struct device *dev)
2447{
2448 struct edma_cc *ecc = dev_get_drvdata(dev);
Peter Ujfalusie4e886c2015-10-14 14:43:06 +03002449 struct edma_chan *echan = ecc->slave_chans;
Peter Ujfalusi2b6b3b72015-10-14 14:42:53 +03002450 int i;
2451 s8 (*queue_priority_mapping)[2];
2452
2453 queue_priority_mapping = ecc->info->queue_priority_mapping;
2454
2455 /* Event queue priority mapping */
2456 for (i = 0; queue_priority_mapping[i][0] != -1; i++)
2457 edma_assign_priority_to_queue(ecc, queue_priority_mapping[i][0],
2458 queue_priority_mapping[i][1]);
2459
Peter Ujfalusi2b6b3b72015-10-14 14:42:53 +03002460 for (i = 0; i < ecc->num_channels; i++) {
Peter Ujfalusie4e886c2015-10-14 14:43:06 +03002461 if (echan[i].alloced) {
Peter Ujfalusi2b6b3b72015-10-14 14:42:53 +03002462 /* ensure access through shadow region 0 */
2463 edma_or_array2(ecc, EDMA_DRAE, 0, i >> 5,
2464 BIT(i & 0x1f));
2465
Peter Ujfalusi34cf3012015-10-16 10:18:01 +03002466 edma_setup_interrupt(&echan[i], true);
Peter Ujfalusie4e886c2015-10-14 14:43:06 +03002467
2468 /* Set up channel -> slot mapping for the entry slot */
Peter Ujfalusi34cf3012015-10-16 10:18:01 +03002469 edma_set_chmap(&echan[i], echan[i].slot[0]);
Peter Ujfalusi2b6b3b72015-10-14 14:42:53 +03002470 }
2471 }
2472
2473 return 0;
2474}
2475#endif
2476
2477static const struct dev_pm_ops edma_pm_ops = {
Peter Ujfalusi1be53362015-10-16 10:18:10 +03002478 SET_LATE_SYSTEM_SLEEP_PM_OPS(edma_pm_suspend, edma_pm_resume)
Peter Ujfalusi2b6b3b72015-10-14 14:42:53 +03002479};
2480
Matt Porterc2dde5f2012-08-22 21:09:34 -04002481static struct platform_driver edma_driver = {
2482 .probe = edma_probe,
Bill Pembertona7d6e3e2012-11-19 13:20:04 -05002483 .remove = edma_remove,
Matt Porterc2dde5f2012-08-22 21:09:34 -04002484 .driver = {
Peter Ujfalusi2b6b3b72015-10-14 14:42:53 +03002485 .name = "edma",
2486 .pm = &edma_pm_ops,
2487 .of_match_table = edma_of_ids,
Matt Porterc2dde5f2012-08-22 21:09:34 -04002488 },
2489};
2490
Peter Ujfalusi4fa2d092015-12-16 15:19:05 +02002491static int edma_tptc_probe(struct platform_device *pdev)
2492{
Peter Ujfalusi23f49fd2016-04-06 13:01:46 +03002493 pm_runtime_enable(&pdev->dev);
2494 return pm_runtime_get_sync(&pdev->dev);
Peter Ujfalusi4fa2d092015-12-16 15:19:05 +02002495}
2496
Peter Ujfalusi34635b1a2015-11-02 15:21:40 +02002497static struct platform_driver edma_tptc_driver = {
Peter Ujfalusi4fa2d092015-12-16 15:19:05 +02002498 .probe = edma_tptc_probe,
Peter Ujfalusi34635b1a2015-11-02 15:21:40 +02002499 .driver = {
2500 .name = "edma3-tptc",
2501 .of_match_table = edma_tptc_of_ids,
2502 },
2503};
2504
Matt Porterc2dde5f2012-08-22 21:09:34 -04002505bool edma_filter_fn(struct dma_chan *chan, void *param)
2506{
Peter Ujfalusi1be53362015-10-16 10:18:10 +03002507 bool match = false;
2508
Matt Porterc2dde5f2012-08-22 21:09:34 -04002509 if (chan->device->dev->driver == &edma_driver.driver) {
2510 struct edma_chan *echan = to_edma_chan(chan);
2511 unsigned ch_req = *(unsigned *)param;
Peter Ujfalusi1be53362015-10-16 10:18:10 +03002512 if (ch_req == echan->ch_num) {
2513 /* The channel is going to be used as HW synchronized */
2514 echan->hw_triggered = true;
2515 match = true;
2516 }
Matt Porterc2dde5f2012-08-22 21:09:34 -04002517 }
Peter Ujfalusi1be53362015-10-16 10:18:10 +03002518 return match;
Matt Porterc2dde5f2012-08-22 21:09:34 -04002519}
2520EXPORT_SYMBOL(edma_filter_fn);
2521
Matt Porterc2dde5f2012-08-22 21:09:34 -04002522static int edma_init(void)
2523{
Peter Ujfalusi34635b1a2015-11-02 15:21:40 +02002524 int ret;
2525
2526 ret = platform_driver_register(&edma_tptc_driver);
2527 if (ret)
2528 return ret;
2529
Arnd Bergmann5305e4d2014-10-24 18:14:01 +02002530 return platform_driver_register(&edma_driver);
Matt Porterc2dde5f2012-08-22 21:09:34 -04002531}
2532subsys_initcall(edma_init);
2533
2534static void __exit edma_exit(void)
2535{
Matt Porterc2dde5f2012-08-22 21:09:34 -04002536 platform_driver_unregister(&edma_driver);
Peter Ujfalusi34635b1a2015-11-02 15:21:40 +02002537 platform_driver_unregister(&edma_tptc_driver);
Matt Porterc2dde5f2012-08-22 21:09:34 -04002538}
2539module_exit(edma_exit);
2540
Josh Boyerd71505b2013-09-04 10:32:50 -04002541MODULE_AUTHOR("Matt Porter <matt.porter@linaro.org>");
Matt Porterc2dde5f2012-08-22 21:09:34 -04002542MODULE_DESCRIPTION("TI EDMA DMA engine driver");
2543MODULE_LICENSE("GPL v2");