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Sascha Hauer1ec1e822010-09-30 13:56:34 +00001/*
2 * drivers/dma/imx-sdma.c
3 *
4 * This file contains a driver for the Freescale Smart DMA engine
5 *
6 * Copyright 2010 Sascha Hauer, Pengutronix <s.hauer@pengutronix.de>
7 *
8 * Based on code from Freescale:
9 *
10 * Copyright 2004-2009 Freescale Semiconductor, Inc. All Rights Reserved.
11 *
12 * The code contained herein is licensed under the GNU General Public
13 * License. You may obtain a copy of the GNU General Public License
14 * Version 2 or later at the following locations:
15 *
16 * http://www.opensource.org/licenses/gpl-license.html
17 * http://www.gnu.org/copyleft/gpl.html
18 */
19
20#include <linux/init.h>
Axel Linf8de8f42011-08-30 15:08:24 +080021#include <linux/module.h>
Sascha Hauer1ec1e822010-09-30 13:56:34 +000022#include <linux/types.h>
Richard Zhao0bbc1412012-01-13 11:10:01 +080023#include <linux/bitops.h>
Sascha Hauer1ec1e822010-09-30 13:56:34 +000024#include <linux/mm.h>
25#include <linux/interrupt.h>
26#include <linux/clk.h>
Richard Zhao2ccaef02012-05-11 15:14:27 +080027#include <linux/delay.h>
Sascha Hauer1ec1e822010-09-30 13:56:34 +000028#include <linux/sched.h>
29#include <linux/semaphore.h>
30#include <linux/spinlock.h>
31#include <linux/device.h>
32#include <linux/dma-mapping.h>
33#include <linux/firmware.h>
34#include <linux/slab.h>
35#include <linux/platform_device.h>
36#include <linux/dmaengine.h>
Shawn Guo580975d2011-07-14 08:35:48 +080037#include <linux/of.h>
38#include <linux/of_device.h>
Shawn Guo9479e172013-05-30 22:23:32 +080039#include <linux/of_dma.h>
Sascha Hauer1ec1e822010-09-30 13:56:34 +000040
41#include <asm/irq.h>
Arnd Bergmann82906b12012-08-24 15:14:29 +020042#include <linux/platform_data/dma-imx-sdma.h>
43#include <linux/platform_data/dma-imx.h>
Sascha Hauer1ec1e822010-09-30 13:56:34 +000044
Russell King - ARM Linuxd2ebfb32012-03-06 22:34:26 +000045#include "dmaengine.h"
46
Sascha Hauer1ec1e822010-09-30 13:56:34 +000047/* SDMA registers */
48#define SDMA_H_C0PTR 0x000
49#define SDMA_H_INTR 0x004
50#define SDMA_H_STATSTOP 0x008
51#define SDMA_H_START 0x00c
52#define SDMA_H_EVTOVR 0x010
53#define SDMA_H_DSPOVR 0x014
54#define SDMA_H_HOSTOVR 0x018
55#define SDMA_H_EVTPEND 0x01c
56#define SDMA_H_DSPENBL 0x020
57#define SDMA_H_RESET 0x024
58#define SDMA_H_EVTERR 0x028
59#define SDMA_H_INTRMSK 0x02c
60#define SDMA_H_PSW 0x030
61#define SDMA_H_EVTERRDBG 0x034
62#define SDMA_H_CONFIG 0x038
63#define SDMA_ONCE_ENB 0x040
64#define SDMA_ONCE_DATA 0x044
65#define SDMA_ONCE_INSTR 0x048
66#define SDMA_ONCE_STAT 0x04c
67#define SDMA_ONCE_CMD 0x050
68#define SDMA_EVT_MIRROR 0x054
69#define SDMA_ILLINSTADDR 0x058
70#define SDMA_CHN0ADDR 0x05c
71#define SDMA_ONCE_RTB 0x060
72#define SDMA_XTRIG_CONF1 0x070
73#define SDMA_XTRIG_CONF2 0x074
Shawn Guo62550cd2011-07-13 21:33:17 +080074#define SDMA_CHNENBL0_IMX35 0x200
75#define SDMA_CHNENBL0_IMX31 0x080
Sascha Hauer1ec1e822010-09-30 13:56:34 +000076#define SDMA_CHNPRI_0 0x100
77
78/*
79 * Buffer descriptor status values.
80 */
81#define BD_DONE 0x01
82#define BD_WRAP 0x02
83#define BD_CONT 0x04
84#define BD_INTR 0x08
85#define BD_RROR 0x10
86#define BD_LAST 0x20
87#define BD_EXTD 0x80
88
89/*
90 * Data Node descriptor status values.
91 */
92#define DND_END_OF_FRAME 0x80
93#define DND_END_OF_XFER 0x40
94#define DND_DONE 0x20
95#define DND_UNUSED 0x01
96
97/*
98 * IPCV2 descriptor status values.
99 */
100#define BD_IPCV2_END_OF_FRAME 0x40
101
102#define IPCV2_MAX_NODES 50
103/*
104 * Error bit set in the CCB status field by the SDMA,
105 * in setbd routine, in case of a transfer error
106 */
107#define DATA_ERROR 0x10000000
108
109/*
110 * Buffer descriptor commands.
111 */
112#define C0_ADDR 0x01
113#define C0_LOAD 0x02
114#define C0_DUMP 0x03
115#define C0_SETCTX 0x07
116#define C0_GETCTX 0x03
117#define C0_SETDM 0x01
118#define C0_SETPM 0x04
119#define C0_GETDM 0x02
120#define C0_GETPM 0x08
121/*
122 * Change endianness indicator in the BD command field
123 */
124#define CHANGE_ENDIANNESS 0x80
125
126/*
127 * Mode/Count of data node descriptors - IPCv2
128 */
129struct sdma_mode_count {
130 u32 count : 16; /* size of the buffer pointed by this BD */
131 u32 status : 8; /* E,R,I,C,W,D status bits stored here */
132 u32 command : 8; /* command mostlky used for channel 0 */
133};
134
135/*
136 * Buffer descriptor
137 */
138struct sdma_buffer_descriptor {
139 struct sdma_mode_count mode;
140 u32 buffer_addr; /* address of the buffer described */
141 u32 ext_buffer_addr; /* extended buffer address */
142} __attribute__ ((packed));
143
144/**
145 * struct sdma_channel_control - Channel control Block
146 *
147 * @current_bd_ptr current buffer descriptor processed
148 * @base_bd_ptr first element of buffer descriptor array
149 * @unused padding. The SDMA engine expects an array of 128 byte
150 * control blocks
151 */
152struct sdma_channel_control {
153 u32 current_bd_ptr;
154 u32 base_bd_ptr;
155 u32 unused[2];
156} __attribute__ ((packed));
157
158/**
159 * struct sdma_state_registers - SDMA context for a channel
160 *
161 * @pc: program counter
162 * @t: test bit: status of arithmetic & test instruction
163 * @rpc: return program counter
164 * @sf: source fault while loading data
165 * @spc: loop start program counter
166 * @df: destination fault while storing data
167 * @epc: loop end program counter
168 * @lm: loop mode
169 */
170struct sdma_state_registers {
171 u32 pc :14;
172 u32 unused1: 1;
173 u32 t : 1;
174 u32 rpc :14;
175 u32 unused0: 1;
176 u32 sf : 1;
177 u32 spc :14;
178 u32 unused2: 1;
179 u32 df : 1;
180 u32 epc :14;
181 u32 lm : 2;
182} __attribute__ ((packed));
183
184/**
185 * struct sdma_context_data - sdma context specific to a channel
186 *
187 * @channel_state: channel state bits
188 * @gReg: general registers
189 * @mda: burst dma destination address register
190 * @msa: burst dma source address register
191 * @ms: burst dma status register
192 * @md: burst dma data register
193 * @pda: peripheral dma destination address register
194 * @psa: peripheral dma source address register
195 * @ps: peripheral dma status register
196 * @pd: peripheral dma data register
197 * @ca: CRC polynomial register
198 * @cs: CRC accumulator register
199 * @dda: dedicated core destination address register
200 * @dsa: dedicated core source address register
201 * @ds: dedicated core status register
202 * @dd: dedicated core data register
203 */
204struct sdma_context_data {
205 struct sdma_state_registers channel_state;
206 u32 gReg[8];
207 u32 mda;
208 u32 msa;
209 u32 ms;
210 u32 md;
211 u32 pda;
212 u32 psa;
213 u32 ps;
214 u32 pd;
215 u32 ca;
216 u32 cs;
217 u32 dda;
218 u32 dsa;
219 u32 ds;
220 u32 dd;
221 u32 scratch0;
222 u32 scratch1;
223 u32 scratch2;
224 u32 scratch3;
225 u32 scratch4;
226 u32 scratch5;
227 u32 scratch6;
228 u32 scratch7;
229} __attribute__ ((packed));
230
231#define NUM_BD (int)(PAGE_SIZE / sizeof(struct sdma_buffer_descriptor))
232
233struct sdma_engine;
234
235/**
236 * struct sdma_channel - housekeeping for a SDMA channel
237 *
238 * @sdma pointer to the SDMA engine for this channel
Sascha Hauer23889c62011-01-31 10:56:58 +0100239 * @channel the channel number, matches dmaengine chan_id + 1
Sascha Hauer1ec1e822010-09-30 13:56:34 +0000240 * @direction transfer type. Needed for setting SDMA script
241 * @peripheral_type Peripheral type. Needed for setting SDMA script
242 * @event_id0 aka dma request line
243 * @event_id1 for channels that use 2 events
244 * @word_size peripheral access size
245 * @buf_tail ID of the buffer that was processed
246 * @done channel completion
247 * @num_bd max NUM_BD. number of descriptors currently handling
248 */
249struct sdma_channel {
250 struct sdma_engine *sdma;
251 unsigned int channel;
Vinod Kouldb8196d2011-10-13 22:34:23 +0530252 enum dma_transfer_direction direction;
Sascha Hauer1ec1e822010-09-30 13:56:34 +0000253 enum sdma_peripheral_type peripheral_type;
254 unsigned int event_id0;
255 unsigned int event_id1;
256 enum dma_slave_buswidth word_size;
257 unsigned int buf_tail;
258 struct completion done;
259 unsigned int num_bd;
260 struct sdma_buffer_descriptor *bd;
261 dma_addr_t bd_phys;
262 unsigned int pc_from_device, pc_to_device;
263 unsigned long flags;
264 dma_addr_t per_address;
Richard Zhao0bbc1412012-01-13 11:10:01 +0800265 unsigned long event_mask[2];
266 unsigned long watermark_level;
Sascha Hauer1ec1e822010-09-30 13:56:34 +0000267 u32 shp_addr, per_addr;
268 struct dma_chan chan;
269 spinlock_t lock;
270 struct dma_async_tx_descriptor desc;
Sascha Hauer1ec1e822010-09-30 13:56:34 +0000271 enum dma_status status;
Huang Shijieab59a512011-12-02 10:16:25 +0800272 unsigned int chn_count;
273 unsigned int chn_real_count;
Huang Shijieabd9ccc2012-04-28 18:15:42 +0800274 struct tasklet_struct tasklet;
Sascha Hauer1ec1e822010-09-30 13:56:34 +0000275};
276
Richard Zhao0bbc1412012-01-13 11:10:01 +0800277#define IMX_DMA_SG_LOOP BIT(0)
Sascha Hauer1ec1e822010-09-30 13:56:34 +0000278
279#define MAX_DMA_CHANNELS 32
280#define MXC_SDMA_DEFAULT_PRIORITY 1
281#define MXC_SDMA_MIN_PRIORITY 1
282#define MXC_SDMA_MAX_PRIORITY 7
283
Sascha Hauer1ec1e822010-09-30 13:56:34 +0000284#define SDMA_FIRMWARE_MAGIC 0x414d4453
285
286/**
287 * struct sdma_firmware_header - Layout of the firmware image
288 *
289 * @magic "SDMA"
290 * @version_major increased whenever layout of struct sdma_script_start_addrs
291 * changes.
292 * @version_minor firmware minor version (for binary compatible changes)
293 * @script_addrs_start offset of struct sdma_script_start_addrs in this image
294 * @num_script_addrs Number of script addresses in this image
295 * @ram_code_start offset of SDMA ram image in this firmware image
296 * @ram_code_size size of SDMA ram image
297 * @script_addrs Stores the start address of the SDMA scripts
298 * (in SDMA memory space)
299 */
300struct sdma_firmware_header {
301 u32 magic;
302 u32 version_major;
303 u32 version_minor;
304 u32 script_addrs_start;
305 u32 num_script_addrs;
306 u32 ram_code_start;
307 u32 ram_code_size;
308};
309
Shawn Guo62550cd2011-07-13 21:33:17 +0800310enum sdma_devtype {
311 IMX31_SDMA, /* runs on i.mx31 */
312 IMX35_SDMA, /* runs on i.mx35 and later */
313};
314
Sascha Hauer1ec1e822010-09-30 13:56:34 +0000315struct sdma_engine {
316 struct device *dev;
Sascha Hauerb9b3f822011-01-12 12:12:31 +0100317 struct device_dma_parameters dma_parms;
Sascha Hauer1ec1e822010-09-30 13:56:34 +0000318 struct sdma_channel channel[MAX_DMA_CHANNELS];
319 struct sdma_channel_control *channel_control;
320 void __iomem *regs;
Shawn Guo62550cd2011-07-13 21:33:17 +0800321 enum sdma_devtype devtype;
Sascha Hauer1ec1e822010-09-30 13:56:34 +0000322 unsigned int num_events;
323 struct sdma_context_data *context;
324 dma_addr_t context_phys;
325 struct dma_device dma_device;
Sascha Hauer7560e3f2012-03-07 09:30:06 +0100326 struct clk *clk_ipg;
327 struct clk *clk_ahb;
Richard Zhao2ccaef02012-05-11 15:14:27 +0800328 spinlock_t channel_0_lock;
Sascha Hauer1ec1e822010-09-30 13:56:34 +0000329 struct sdma_script_start_addrs *script_addrs;
330};
331
Shawn Guo62550cd2011-07-13 21:33:17 +0800332static struct platform_device_id sdma_devtypes[] = {
333 {
334 .name = "imx31-sdma",
335 .driver_data = IMX31_SDMA,
336 }, {
337 .name = "imx35-sdma",
338 .driver_data = IMX35_SDMA,
339 }, {
340 /* sentinel */
341 }
342};
343MODULE_DEVICE_TABLE(platform, sdma_devtypes);
344
Shawn Guo580975d2011-07-14 08:35:48 +0800345static const struct of_device_id sdma_dt_ids[] = {
346 { .compatible = "fsl,imx31-sdma", .data = &sdma_devtypes[IMX31_SDMA], },
347 { .compatible = "fsl,imx35-sdma", .data = &sdma_devtypes[IMX35_SDMA], },
348 { /* sentinel */ }
349};
350MODULE_DEVICE_TABLE(of, sdma_dt_ids);
351
Richard Zhao0bbc1412012-01-13 11:10:01 +0800352#define SDMA_H_CONFIG_DSPDMA BIT(12) /* indicates if the DSPDMA is used */
353#define SDMA_H_CONFIG_RTD_PINS BIT(11) /* indicates if Real-Time Debug pins are enabled */
354#define SDMA_H_CONFIG_ACR BIT(4) /* indicates if AHB freq /core freq = 2 or 1 */
Sascha Hauer1ec1e822010-09-30 13:56:34 +0000355#define SDMA_H_CONFIG_CSM (3) /* indicates which context switch mode is selected*/
356
357static inline u32 chnenbl_ofs(struct sdma_engine *sdma, unsigned int event)
358{
Shawn Guo62550cd2011-07-13 21:33:17 +0800359 u32 chnenbl0 = (sdma->devtype == IMX31_SDMA ? SDMA_CHNENBL0_IMX31 :
360 SDMA_CHNENBL0_IMX35);
Sascha Hauer1ec1e822010-09-30 13:56:34 +0000361 return chnenbl0 + event * 4;
362}
363
364static int sdma_config_ownership(struct sdma_channel *sdmac,
365 bool event_override, bool mcu_override, bool dsp_override)
366{
367 struct sdma_engine *sdma = sdmac->sdma;
368 int channel = sdmac->channel;
Richard Zhao0bbc1412012-01-13 11:10:01 +0800369 unsigned long evt, mcu, dsp;
Sascha Hauer1ec1e822010-09-30 13:56:34 +0000370
371 if (event_override && mcu_override && dsp_override)
372 return -EINVAL;
373
Richard Zhaoc4b56852012-01-13 11:09:57 +0800374 evt = readl_relaxed(sdma->regs + SDMA_H_EVTOVR);
375 mcu = readl_relaxed(sdma->regs + SDMA_H_HOSTOVR);
376 dsp = readl_relaxed(sdma->regs + SDMA_H_DSPOVR);
Sascha Hauer1ec1e822010-09-30 13:56:34 +0000377
378 if (dsp_override)
Richard Zhao0bbc1412012-01-13 11:10:01 +0800379 __clear_bit(channel, &dsp);
Sascha Hauer1ec1e822010-09-30 13:56:34 +0000380 else
Richard Zhao0bbc1412012-01-13 11:10:01 +0800381 __set_bit(channel, &dsp);
Sascha Hauer1ec1e822010-09-30 13:56:34 +0000382
383 if (event_override)
Richard Zhao0bbc1412012-01-13 11:10:01 +0800384 __clear_bit(channel, &evt);
Sascha Hauer1ec1e822010-09-30 13:56:34 +0000385 else
Richard Zhao0bbc1412012-01-13 11:10:01 +0800386 __set_bit(channel, &evt);
Sascha Hauer1ec1e822010-09-30 13:56:34 +0000387
388 if (mcu_override)
Richard Zhao0bbc1412012-01-13 11:10:01 +0800389 __clear_bit(channel, &mcu);
Sascha Hauer1ec1e822010-09-30 13:56:34 +0000390 else
Richard Zhao0bbc1412012-01-13 11:10:01 +0800391 __set_bit(channel, &mcu);
Sascha Hauer1ec1e822010-09-30 13:56:34 +0000392
Richard Zhaoc4b56852012-01-13 11:09:57 +0800393 writel_relaxed(evt, sdma->regs + SDMA_H_EVTOVR);
394 writel_relaxed(mcu, sdma->regs + SDMA_H_HOSTOVR);
395 writel_relaxed(dsp, sdma->regs + SDMA_H_DSPOVR);
Sascha Hauer1ec1e822010-09-30 13:56:34 +0000396
397 return 0;
398}
399
Richard Zhaob9a591662012-01-13 11:09:56 +0800400static void sdma_enable_channel(struct sdma_engine *sdma, int channel)
401{
Richard Zhao0bbc1412012-01-13 11:10:01 +0800402 writel(BIT(channel), sdma->regs + SDMA_H_START);
Richard Zhaob9a591662012-01-13 11:09:56 +0800403}
404
Sascha Hauer1ec1e822010-09-30 13:56:34 +0000405/*
Richard Zhao2ccaef02012-05-11 15:14:27 +0800406 * sdma_run_channel0 - run a channel and wait till it's done
Sascha Hauer1ec1e822010-09-30 13:56:34 +0000407 */
Richard Zhao2ccaef02012-05-11 15:14:27 +0800408static int sdma_run_channel0(struct sdma_engine *sdma)
Sascha Hauer1ec1e822010-09-30 13:56:34 +0000409{
Sascha Hauer1ec1e822010-09-30 13:56:34 +0000410 int ret;
Richard Zhao2ccaef02012-05-11 15:14:27 +0800411 unsigned long timeout = 500;
Sascha Hauer1ec1e822010-09-30 13:56:34 +0000412
Richard Zhao2ccaef02012-05-11 15:14:27 +0800413 sdma_enable_channel(sdma, 0);
Sascha Hauer1ec1e822010-09-30 13:56:34 +0000414
Richard Zhao2ccaef02012-05-11 15:14:27 +0800415 while (!(ret = readl_relaxed(sdma->regs + SDMA_H_INTR) & 1)) {
416 if (timeout-- <= 0)
417 break;
418 udelay(1);
419 }
Sascha Hauer1ec1e822010-09-30 13:56:34 +0000420
Richard Zhao2ccaef02012-05-11 15:14:27 +0800421 if (ret) {
422 /* Clear the interrupt status */
423 writel_relaxed(ret, sdma->regs + SDMA_H_INTR);
424 } else {
425 dev_err(sdma->dev, "Timeout waiting for CH0 ready\n");
426 }
Sascha Hauer1ec1e822010-09-30 13:56:34 +0000427
428 return ret ? 0 : -ETIMEDOUT;
429}
430
431static int sdma_load_script(struct sdma_engine *sdma, void *buf, int size,
432 u32 address)
433{
434 struct sdma_buffer_descriptor *bd0 = sdma->channel[0].bd;
435 void *buf_virt;
436 dma_addr_t buf_phys;
437 int ret;
Richard Zhao2ccaef02012-05-11 15:14:27 +0800438 unsigned long flags;
Sascha Hauer73eab972011-08-25 11:03:35 +0200439
Sascha Hauer1ec1e822010-09-30 13:56:34 +0000440 buf_virt = dma_alloc_coherent(NULL,
441 size,
442 &buf_phys, GFP_KERNEL);
Sascha Hauer73eab972011-08-25 11:03:35 +0200443 if (!buf_virt) {
Richard Zhao2ccaef02012-05-11 15:14:27 +0800444 return -ENOMEM;
Sascha Hauer73eab972011-08-25 11:03:35 +0200445 }
Sascha Hauer1ec1e822010-09-30 13:56:34 +0000446
Richard Zhao2ccaef02012-05-11 15:14:27 +0800447 spin_lock_irqsave(&sdma->channel_0_lock, flags);
448
Sascha Hauer1ec1e822010-09-30 13:56:34 +0000449 bd0->mode.command = C0_SETPM;
450 bd0->mode.status = BD_DONE | BD_INTR | BD_WRAP | BD_EXTD;
451 bd0->mode.count = size / 2;
452 bd0->buffer_addr = buf_phys;
453 bd0->ext_buffer_addr = address;
454
455 memcpy(buf_virt, buf, size);
456
Richard Zhao2ccaef02012-05-11 15:14:27 +0800457 ret = sdma_run_channel0(sdma);
458
459 spin_unlock_irqrestore(&sdma->channel_0_lock, flags);
Sascha Hauer1ec1e822010-09-30 13:56:34 +0000460
461 dma_free_coherent(NULL, size, buf_virt, buf_phys);
462
463 return ret;
464}
465
466static void sdma_event_enable(struct sdma_channel *sdmac, unsigned int event)
467{
468 struct sdma_engine *sdma = sdmac->sdma;
469 int channel = sdmac->channel;
Richard Zhao0bbc1412012-01-13 11:10:01 +0800470 unsigned long val;
Sascha Hauer1ec1e822010-09-30 13:56:34 +0000471 u32 chnenbl = chnenbl_ofs(sdma, event);
472
Richard Zhaoc4b56852012-01-13 11:09:57 +0800473 val = readl_relaxed(sdma->regs + chnenbl);
Richard Zhao0bbc1412012-01-13 11:10:01 +0800474 __set_bit(channel, &val);
Richard Zhaoc4b56852012-01-13 11:09:57 +0800475 writel_relaxed(val, sdma->regs + chnenbl);
Sascha Hauer1ec1e822010-09-30 13:56:34 +0000476}
477
478static void sdma_event_disable(struct sdma_channel *sdmac, unsigned int event)
479{
480 struct sdma_engine *sdma = sdmac->sdma;
481 int channel = sdmac->channel;
482 u32 chnenbl = chnenbl_ofs(sdma, event);
Richard Zhao0bbc1412012-01-13 11:10:01 +0800483 unsigned long val;
Sascha Hauer1ec1e822010-09-30 13:56:34 +0000484
Richard Zhaoc4b56852012-01-13 11:09:57 +0800485 val = readl_relaxed(sdma->regs + chnenbl);
Richard Zhao0bbc1412012-01-13 11:10:01 +0800486 __clear_bit(channel, &val);
Richard Zhaoc4b56852012-01-13 11:09:57 +0800487 writel_relaxed(val, sdma->regs + chnenbl);
Sascha Hauer1ec1e822010-09-30 13:56:34 +0000488}
489
490static void sdma_handle_channel_loop(struct sdma_channel *sdmac)
491{
492 struct sdma_buffer_descriptor *bd;
493
494 /*
495 * loop mode. Iterate over descriptors, re-setup them and
496 * call callback function.
497 */
498 while (1) {
499 bd = &sdmac->bd[sdmac->buf_tail];
500
501 if (bd->mode.status & BD_DONE)
502 break;
503
504 if (bd->mode.status & BD_RROR)
505 sdmac->status = DMA_ERROR;
506 else
Shawn Guo1e9cebb2011-01-20 05:50:38 +0800507 sdmac->status = DMA_IN_PROGRESS;
Sascha Hauer1ec1e822010-09-30 13:56:34 +0000508
509 bd->mode.status |= BD_DONE;
510 sdmac->buf_tail++;
511 sdmac->buf_tail %= sdmac->num_bd;
512
513 if (sdmac->desc.callback)
514 sdmac->desc.callback(sdmac->desc.callback_param);
515 }
516}
517
518static void mxc_sdma_handle_channel_normal(struct sdma_channel *sdmac)
519{
520 struct sdma_buffer_descriptor *bd;
521 int i, error = 0;
522
Huang Shijieab59a512011-12-02 10:16:25 +0800523 sdmac->chn_real_count = 0;
Sascha Hauer1ec1e822010-09-30 13:56:34 +0000524 /*
525 * non loop mode. Iterate over all descriptors, collect
526 * errors and call callback function
527 */
528 for (i = 0; i < sdmac->num_bd; i++) {
529 bd = &sdmac->bd[i];
530
531 if (bd->mode.status & (BD_DONE | BD_RROR))
532 error = -EIO;
Huang Shijieab59a512011-12-02 10:16:25 +0800533 sdmac->chn_real_count += bd->mode.count;
Sascha Hauer1ec1e822010-09-30 13:56:34 +0000534 }
535
536 if (error)
537 sdmac->status = DMA_ERROR;
538 else
539 sdmac->status = DMA_SUCCESS;
540
Russell King - ARM Linuxf7fbce02012-03-06 22:35:07 +0000541 dma_cookie_complete(&sdmac->desc);
Sascha Hauer1ec1e822010-09-30 13:56:34 +0000542 if (sdmac->desc.callback)
543 sdmac->desc.callback(sdmac->desc.callback_param);
Sascha Hauer1ec1e822010-09-30 13:56:34 +0000544}
545
Huang Shijieabd9ccc2012-04-28 18:15:42 +0800546static void sdma_tasklet(unsigned long data)
Sascha Hauer1ec1e822010-09-30 13:56:34 +0000547{
Huang Shijieabd9ccc2012-04-28 18:15:42 +0800548 struct sdma_channel *sdmac = (struct sdma_channel *) data;
549
Sascha Hauer1ec1e822010-09-30 13:56:34 +0000550 complete(&sdmac->done);
551
Sascha Hauer1ec1e822010-09-30 13:56:34 +0000552 if (sdmac->flags & IMX_DMA_SG_LOOP)
553 sdma_handle_channel_loop(sdmac);
554 else
555 mxc_sdma_handle_channel_normal(sdmac);
556}
557
558static irqreturn_t sdma_int_handler(int irq, void *dev_id)
559{
560 struct sdma_engine *sdma = dev_id;
Richard Zhao0bbc1412012-01-13 11:10:01 +0800561 unsigned long stat;
Sascha Hauer1ec1e822010-09-30 13:56:34 +0000562
Richard Zhaoc4b56852012-01-13 11:09:57 +0800563 stat = readl_relaxed(sdma->regs + SDMA_H_INTR);
Richard Zhao2ccaef02012-05-11 15:14:27 +0800564 /* not interested in channel 0 interrupts */
565 stat &= ~1;
Richard Zhaoc4b56852012-01-13 11:09:57 +0800566 writel_relaxed(stat, sdma->regs + SDMA_H_INTR);
Sascha Hauer1ec1e822010-09-30 13:56:34 +0000567
568 while (stat) {
569 int channel = fls(stat) - 1;
570 struct sdma_channel *sdmac = &sdma->channel[channel];
571
Huang Shijieabd9ccc2012-04-28 18:15:42 +0800572 tasklet_schedule(&sdmac->tasklet);
Sascha Hauer1ec1e822010-09-30 13:56:34 +0000573
Richard Zhao0bbc1412012-01-13 11:10:01 +0800574 __clear_bit(channel, &stat);
Sascha Hauer1ec1e822010-09-30 13:56:34 +0000575 }
576
577 return IRQ_HANDLED;
578}
579
580/*
581 * sets the pc of SDMA script according to the peripheral type
582 */
583static void sdma_get_pc(struct sdma_channel *sdmac,
584 enum sdma_peripheral_type peripheral_type)
585{
586 struct sdma_engine *sdma = sdmac->sdma;
587 int per_2_emi = 0, emi_2_per = 0;
588 /*
589 * These are needed once we start to support transfers between
590 * two peripherals or memory-to-memory transfers
591 */
592 int per_2_per = 0, emi_2_emi = 0;
593
594 sdmac->pc_from_device = 0;
595 sdmac->pc_to_device = 0;
596
597 switch (peripheral_type) {
598 case IMX_DMATYPE_MEMORY:
599 emi_2_emi = sdma->script_addrs->ap_2_ap_addr;
600 break;
601 case IMX_DMATYPE_DSP:
602 emi_2_per = sdma->script_addrs->bp_2_ap_addr;
603 per_2_emi = sdma->script_addrs->ap_2_bp_addr;
604 break;
605 case IMX_DMATYPE_FIRI:
606 per_2_emi = sdma->script_addrs->firi_2_mcu_addr;
607 emi_2_per = sdma->script_addrs->mcu_2_firi_addr;
608 break;
609 case IMX_DMATYPE_UART:
610 per_2_emi = sdma->script_addrs->uart_2_mcu_addr;
611 emi_2_per = sdma->script_addrs->mcu_2_app_addr;
612 break;
613 case IMX_DMATYPE_UART_SP:
614 per_2_emi = sdma->script_addrs->uartsh_2_mcu_addr;
615 emi_2_per = sdma->script_addrs->mcu_2_shp_addr;
616 break;
617 case IMX_DMATYPE_ATA:
618 per_2_emi = sdma->script_addrs->ata_2_mcu_addr;
619 emi_2_per = sdma->script_addrs->mcu_2_ata_addr;
620 break;
621 case IMX_DMATYPE_CSPI:
622 case IMX_DMATYPE_EXT:
623 case IMX_DMATYPE_SSI:
624 per_2_emi = sdma->script_addrs->app_2_mcu_addr;
625 emi_2_per = sdma->script_addrs->mcu_2_app_addr;
626 break;
627 case IMX_DMATYPE_SSI_SP:
628 case IMX_DMATYPE_MMC:
629 case IMX_DMATYPE_SDHC:
630 case IMX_DMATYPE_CSPI_SP:
631 case IMX_DMATYPE_ESAI:
632 case IMX_DMATYPE_MSHC_SP:
633 per_2_emi = sdma->script_addrs->shp_2_mcu_addr;
634 emi_2_per = sdma->script_addrs->mcu_2_shp_addr;
635 break;
636 case IMX_DMATYPE_ASRC:
637 per_2_emi = sdma->script_addrs->asrc_2_mcu_addr;
638 emi_2_per = sdma->script_addrs->asrc_2_mcu_addr;
639 per_2_per = sdma->script_addrs->per_2_per_addr;
640 break;
641 case IMX_DMATYPE_MSHC:
642 per_2_emi = sdma->script_addrs->mshc_2_mcu_addr;
643 emi_2_per = sdma->script_addrs->mcu_2_mshc_addr;
644 break;
645 case IMX_DMATYPE_CCM:
646 per_2_emi = sdma->script_addrs->dptc_dvfs_addr;
647 break;
648 case IMX_DMATYPE_SPDIF:
649 per_2_emi = sdma->script_addrs->spdif_2_mcu_addr;
650 emi_2_per = sdma->script_addrs->mcu_2_spdif_addr;
651 break;
652 case IMX_DMATYPE_IPU_MEMORY:
653 emi_2_per = sdma->script_addrs->ext_mem_2_ipu_addr;
654 break;
655 default:
656 break;
657 }
658
659 sdmac->pc_from_device = per_2_emi;
660 sdmac->pc_to_device = emi_2_per;
661}
662
663static int sdma_load_context(struct sdma_channel *sdmac)
664{
665 struct sdma_engine *sdma = sdmac->sdma;
666 int channel = sdmac->channel;
667 int load_address;
668 struct sdma_context_data *context = sdma->context;
669 struct sdma_buffer_descriptor *bd0 = sdma->channel[0].bd;
670 int ret;
Richard Zhao2ccaef02012-05-11 15:14:27 +0800671 unsigned long flags;
Sascha Hauer1ec1e822010-09-30 13:56:34 +0000672
Vinod Kouldb8196d2011-10-13 22:34:23 +0530673 if (sdmac->direction == DMA_DEV_TO_MEM) {
Sascha Hauer1ec1e822010-09-30 13:56:34 +0000674 load_address = sdmac->pc_from_device;
675 } else {
676 load_address = sdmac->pc_to_device;
677 }
678
679 if (load_address < 0)
680 return load_address;
681
682 dev_dbg(sdma->dev, "load_address = %d\n", load_address);
Richard Zhao0bbc1412012-01-13 11:10:01 +0800683 dev_dbg(sdma->dev, "wml = 0x%08x\n", (u32)sdmac->watermark_level);
Sascha Hauer1ec1e822010-09-30 13:56:34 +0000684 dev_dbg(sdma->dev, "shp_addr = 0x%08x\n", sdmac->shp_addr);
685 dev_dbg(sdma->dev, "per_addr = 0x%08x\n", sdmac->per_addr);
Richard Zhao0bbc1412012-01-13 11:10:01 +0800686 dev_dbg(sdma->dev, "event_mask0 = 0x%08x\n", (u32)sdmac->event_mask[0]);
687 dev_dbg(sdma->dev, "event_mask1 = 0x%08x\n", (u32)sdmac->event_mask[1]);
Sascha Hauer1ec1e822010-09-30 13:56:34 +0000688
Richard Zhao2ccaef02012-05-11 15:14:27 +0800689 spin_lock_irqsave(&sdma->channel_0_lock, flags);
Sascha Hauer73eab972011-08-25 11:03:35 +0200690
Sascha Hauer1ec1e822010-09-30 13:56:34 +0000691 memset(context, 0, sizeof(*context));
692 context->channel_state.pc = load_address;
693
694 /* Send by context the event mask,base address for peripheral
695 * and watermark level
696 */
Richard Zhao0bbc1412012-01-13 11:10:01 +0800697 context->gReg[0] = sdmac->event_mask[1];
698 context->gReg[1] = sdmac->event_mask[0];
Sascha Hauer1ec1e822010-09-30 13:56:34 +0000699 context->gReg[2] = sdmac->per_addr;
700 context->gReg[6] = sdmac->shp_addr;
701 context->gReg[7] = sdmac->watermark_level;
702
703 bd0->mode.command = C0_SETDM;
704 bd0->mode.status = BD_DONE | BD_INTR | BD_WRAP | BD_EXTD;
705 bd0->mode.count = sizeof(*context) / 4;
706 bd0->buffer_addr = sdma->context_phys;
707 bd0->ext_buffer_addr = 2048 + (sizeof(*context) / 4) * channel;
Richard Zhao2ccaef02012-05-11 15:14:27 +0800708 ret = sdma_run_channel0(sdma);
Sascha Hauer1ec1e822010-09-30 13:56:34 +0000709
Richard Zhao2ccaef02012-05-11 15:14:27 +0800710 spin_unlock_irqrestore(&sdma->channel_0_lock, flags);
Sascha Hauer73eab972011-08-25 11:03:35 +0200711
Sascha Hauer1ec1e822010-09-30 13:56:34 +0000712 return ret;
713}
714
715static void sdma_disable_channel(struct sdma_channel *sdmac)
716{
717 struct sdma_engine *sdma = sdmac->sdma;
718 int channel = sdmac->channel;
719
Richard Zhao0bbc1412012-01-13 11:10:01 +0800720 writel_relaxed(BIT(channel), sdma->regs + SDMA_H_STATSTOP);
Sascha Hauer1ec1e822010-09-30 13:56:34 +0000721 sdmac->status = DMA_ERROR;
722}
723
724static int sdma_config_channel(struct sdma_channel *sdmac)
725{
726 int ret;
727
728 sdma_disable_channel(sdmac);
729
Richard Zhao0bbc1412012-01-13 11:10:01 +0800730 sdmac->event_mask[0] = 0;
731 sdmac->event_mask[1] = 0;
Sascha Hauer1ec1e822010-09-30 13:56:34 +0000732 sdmac->shp_addr = 0;
733 sdmac->per_addr = 0;
734
735 if (sdmac->event_id0) {
Richard Zhaob78bd912012-01-13 11:10:00 +0800736 if (sdmac->event_id0 >= sdmac->sdma->num_events)
Sascha Hauer1ec1e822010-09-30 13:56:34 +0000737 return -EINVAL;
738 sdma_event_enable(sdmac, sdmac->event_id0);
739 }
740
741 switch (sdmac->peripheral_type) {
742 case IMX_DMATYPE_DSP:
743 sdma_config_ownership(sdmac, false, true, true);
744 break;
745 case IMX_DMATYPE_MEMORY:
746 sdma_config_ownership(sdmac, false, true, false);
747 break;
748 default:
749 sdma_config_ownership(sdmac, true, true, false);
750 break;
751 }
752
753 sdma_get_pc(sdmac, sdmac->peripheral_type);
754
755 if ((sdmac->peripheral_type != IMX_DMATYPE_MEMORY) &&
756 (sdmac->peripheral_type != IMX_DMATYPE_DSP)) {
757 /* Handle multiple event channels differently */
758 if (sdmac->event_id1) {
Richard Zhao0bbc1412012-01-13 11:10:01 +0800759 sdmac->event_mask[1] = BIT(sdmac->event_id1 % 32);
Sascha Hauer1ec1e822010-09-30 13:56:34 +0000760 if (sdmac->event_id1 > 31)
Richard Zhao0bbc1412012-01-13 11:10:01 +0800761 __set_bit(31, &sdmac->watermark_level);
762 sdmac->event_mask[0] = BIT(sdmac->event_id0 % 32);
Sascha Hauer1ec1e822010-09-30 13:56:34 +0000763 if (sdmac->event_id0 > 31)
Richard Zhao0bbc1412012-01-13 11:10:01 +0800764 __set_bit(30, &sdmac->watermark_level);
Sascha Hauer1ec1e822010-09-30 13:56:34 +0000765 } else {
Richard Zhao0bbc1412012-01-13 11:10:01 +0800766 __set_bit(sdmac->event_id0, sdmac->event_mask);
Sascha Hauer1ec1e822010-09-30 13:56:34 +0000767 }
768 /* Watermark Level */
769 sdmac->watermark_level |= sdmac->watermark_level;
770 /* Address */
771 sdmac->shp_addr = sdmac->per_address;
772 } else {
773 sdmac->watermark_level = 0; /* FIXME: M3_BASE_ADDRESS */
774 }
775
776 ret = sdma_load_context(sdmac);
777
778 return ret;
779}
780
781static int sdma_set_channel_priority(struct sdma_channel *sdmac,
782 unsigned int priority)
783{
784 struct sdma_engine *sdma = sdmac->sdma;
785 int channel = sdmac->channel;
786
787 if (priority < MXC_SDMA_MIN_PRIORITY
788 || priority > MXC_SDMA_MAX_PRIORITY) {
789 return -EINVAL;
790 }
791
Richard Zhaoc4b56852012-01-13 11:09:57 +0800792 writel_relaxed(priority, sdma->regs + SDMA_CHNPRI_0 + 4 * channel);
Sascha Hauer1ec1e822010-09-30 13:56:34 +0000793
794 return 0;
795}
796
797static int sdma_request_channel(struct sdma_channel *sdmac)
798{
799 struct sdma_engine *sdma = sdmac->sdma;
800 int channel = sdmac->channel;
801 int ret = -EBUSY;
802
803 sdmac->bd = dma_alloc_coherent(NULL, PAGE_SIZE, &sdmac->bd_phys, GFP_KERNEL);
804 if (!sdmac->bd) {
805 ret = -ENOMEM;
806 goto out;
807 }
808
809 memset(sdmac->bd, 0, PAGE_SIZE);
810
811 sdma->channel_control[channel].base_bd_ptr = sdmac->bd_phys;
812 sdma->channel_control[channel].current_bd_ptr = sdmac->bd_phys;
813
Sascha Hauer1ec1e822010-09-30 13:56:34 +0000814 sdma_set_channel_priority(sdmac, MXC_SDMA_DEFAULT_PRIORITY);
815
816 init_completion(&sdmac->done);
817
Sascha Hauer1ec1e822010-09-30 13:56:34 +0000818 return 0;
819out:
820
821 return ret;
822}
823
Sascha Hauer1ec1e822010-09-30 13:56:34 +0000824static struct sdma_channel *to_sdma_chan(struct dma_chan *chan)
825{
826 return container_of(chan, struct sdma_channel, chan);
827}
828
829static dma_cookie_t sdma_tx_submit(struct dma_async_tx_descriptor *tx)
830{
Haitao Zhangf69f2e22012-01-01 11:30:06 +0800831 unsigned long flags;
Sascha Hauer1ec1e822010-09-30 13:56:34 +0000832 struct sdma_channel *sdmac = to_sdma_chan(tx->chan);
Sascha Hauer1ec1e822010-09-30 13:56:34 +0000833 dma_cookie_t cookie;
834
Haitao Zhangf69f2e22012-01-01 11:30:06 +0800835 spin_lock_irqsave(&sdmac->lock, flags);
Sascha Hauer1ec1e822010-09-30 13:56:34 +0000836
Russell King - ARM Linux884485e2012-03-06 22:34:46 +0000837 cookie = dma_cookie_assign(tx);
Sascha Hauer1ec1e822010-09-30 13:56:34 +0000838
Haitao Zhangf69f2e22012-01-01 11:30:06 +0800839 spin_unlock_irqrestore(&sdmac->lock, flags);
Sascha Hauer1ec1e822010-09-30 13:56:34 +0000840
841 return cookie;
842}
843
844static int sdma_alloc_chan_resources(struct dma_chan *chan)
845{
846 struct sdma_channel *sdmac = to_sdma_chan(chan);
847 struct imx_dma_data *data = chan->private;
848 int prio, ret;
849
Sascha Hauer1ec1e822010-09-30 13:56:34 +0000850 if (!data)
851 return -EINVAL;
852
853 switch (data->priority) {
854 case DMA_PRIO_HIGH:
855 prio = 3;
856 break;
857 case DMA_PRIO_MEDIUM:
858 prio = 2;
859 break;
860 case DMA_PRIO_LOW:
861 default:
862 prio = 1;
863 break;
864 }
865
866 sdmac->peripheral_type = data->peripheral_type;
867 sdmac->event_id0 = data->dma_request;
Richard Zhaoc2c744d2012-01-13 11:09:59 +0800868
Sascha Hauer7560e3f2012-03-07 09:30:06 +0100869 clk_enable(sdmac->sdma->clk_ipg);
870 clk_enable(sdmac->sdma->clk_ahb);
Richard Zhaoc2c744d2012-01-13 11:09:59 +0800871
Richard Zhao3bb5e7c2012-01-13 11:09:58 +0800872 ret = sdma_request_channel(sdmac);
Sascha Hauer1ec1e822010-09-30 13:56:34 +0000873 if (ret)
874 return ret;
875
Richard Zhao3bb5e7c2012-01-13 11:09:58 +0800876 ret = sdma_set_channel_priority(sdmac, prio);
Sascha Hauer1ec1e822010-09-30 13:56:34 +0000877 if (ret)
878 return ret;
879
880 dma_async_tx_descriptor_init(&sdmac->desc, chan);
881 sdmac->desc.tx_submit = sdma_tx_submit;
882 /* txd.flags will be overwritten in prep funcs */
883 sdmac->desc.flags = DMA_CTRL_ACK;
884
885 return 0;
886}
887
888static void sdma_free_chan_resources(struct dma_chan *chan)
889{
890 struct sdma_channel *sdmac = to_sdma_chan(chan);
891 struct sdma_engine *sdma = sdmac->sdma;
892
893 sdma_disable_channel(sdmac);
894
895 if (sdmac->event_id0)
896 sdma_event_disable(sdmac, sdmac->event_id0);
897 if (sdmac->event_id1)
898 sdma_event_disable(sdmac, sdmac->event_id1);
899
900 sdmac->event_id0 = 0;
901 sdmac->event_id1 = 0;
902
903 sdma_set_channel_priority(sdmac, 0);
904
905 dma_free_coherent(NULL, PAGE_SIZE, sdmac->bd, sdmac->bd_phys);
906
Sascha Hauer7560e3f2012-03-07 09:30:06 +0100907 clk_disable(sdma->clk_ipg);
908 clk_disable(sdma->clk_ahb);
Sascha Hauer1ec1e822010-09-30 13:56:34 +0000909}
910
911static struct dma_async_tx_descriptor *sdma_prep_slave_sg(
912 struct dma_chan *chan, struct scatterlist *sgl,
Vinod Kouldb8196d2011-10-13 22:34:23 +0530913 unsigned int sg_len, enum dma_transfer_direction direction,
Alexandre Bounine185ecb52012-03-08 15:35:13 -0500914 unsigned long flags, void *context)
Sascha Hauer1ec1e822010-09-30 13:56:34 +0000915{
916 struct sdma_channel *sdmac = to_sdma_chan(chan);
917 struct sdma_engine *sdma = sdmac->sdma;
918 int ret, i, count;
Sascha Hauer23889c62011-01-31 10:56:58 +0100919 int channel = sdmac->channel;
Sascha Hauer1ec1e822010-09-30 13:56:34 +0000920 struct scatterlist *sg;
921
922 if (sdmac->status == DMA_IN_PROGRESS)
923 return NULL;
924 sdmac->status = DMA_IN_PROGRESS;
925
926 sdmac->flags = 0;
927
Richard Zhao8e2e27c2012-06-04 09:17:24 +0800928 sdmac->buf_tail = 0;
929
Sascha Hauer1ec1e822010-09-30 13:56:34 +0000930 dev_dbg(sdma->dev, "setting up %d entries for channel %d.\n",
931 sg_len, channel);
932
933 sdmac->direction = direction;
934 ret = sdma_load_context(sdmac);
935 if (ret)
936 goto err_out;
937
938 if (sg_len > NUM_BD) {
939 dev_err(sdma->dev, "SDMA channel %d: maximum number of sg exceeded: %d > %d\n",
940 channel, sg_len, NUM_BD);
941 ret = -EINVAL;
942 goto err_out;
943 }
944
Huang Shijieab59a512011-12-02 10:16:25 +0800945 sdmac->chn_count = 0;
Sascha Hauer1ec1e822010-09-30 13:56:34 +0000946 for_each_sg(sgl, sg, sg_len, i) {
947 struct sdma_buffer_descriptor *bd = &sdmac->bd[i];
948 int param;
949
Anatolij Gustschind2f5c272010-11-22 18:35:18 +0100950 bd->buffer_addr = sg->dma_address;
Sascha Hauer1ec1e822010-09-30 13:56:34 +0000951
Lars-Peter Clausenfdaf9c42012-04-25 20:50:52 +0200952 count = sg_dma_len(sg);
Sascha Hauer1ec1e822010-09-30 13:56:34 +0000953
954 if (count > 0xffff) {
955 dev_err(sdma->dev, "SDMA channel %d: maximum bytes for sg entry exceeded: %d > %d\n",
956 channel, count, 0xffff);
957 ret = -EINVAL;
958 goto err_out;
959 }
960
961 bd->mode.count = count;
Huang Shijieab59a512011-12-02 10:16:25 +0800962 sdmac->chn_count += count;
Sascha Hauer1ec1e822010-09-30 13:56:34 +0000963
964 if (sdmac->word_size > DMA_SLAVE_BUSWIDTH_4_BYTES) {
965 ret = -EINVAL;
966 goto err_out;
967 }
Sascha Hauer1fa81c22011-01-12 13:02:28 +0100968
969 switch (sdmac->word_size) {
970 case DMA_SLAVE_BUSWIDTH_4_BYTES:
Sascha Hauer1ec1e822010-09-30 13:56:34 +0000971 bd->mode.command = 0;
Sascha Hauer1fa81c22011-01-12 13:02:28 +0100972 if (count & 3 || sg->dma_address & 3)
973 return NULL;
974 break;
975 case DMA_SLAVE_BUSWIDTH_2_BYTES:
976 bd->mode.command = 2;
977 if (count & 1 || sg->dma_address & 1)
978 return NULL;
979 break;
980 case DMA_SLAVE_BUSWIDTH_1_BYTE:
981 bd->mode.command = 1;
982 break;
983 default:
984 return NULL;
985 }
Sascha Hauer1ec1e822010-09-30 13:56:34 +0000986
987 param = BD_DONE | BD_EXTD | BD_CONT;
988
Shawn Guo341b9412011-01-20 05:50:39 +0800989 if (i + 1 == sg_len) {
Sascha Hauer1ec1e822010-09-30 13:56:34 +0000990 param |= BD_INTR;
Shawn Guo341b9412011-01-20 05:50:39 +0800991 param |= BD_LAST;
992 param &= ~BD_CONT;
Sascha Hauer1ec1e822010-09-30 13:56:34 +0000993 }
994
Sascha Hauer1ec1e822010-09-30 13:56:34 +0000995 dev_dbg(sdma->dev, "entry %d: count: %d dma: 0x%08x %s%s\n",
996 i, count, sg->dma_address,
997 param & BD_WRAP ? "wrap" : "",
998 param & BD_INTR ? " intr" : "");
999
1000 bd->mode.status = param;
1001 }
1002
1003 sdmac->num_bd = sg_len;
1004 sdma->channel_control[channel].current_bd_ptr = sdmac->bd_phys;
1005
1006 return &sdmac->desc;
1007err_out:
Shawn Guo4b2ce9d2011-01-20 05:50:36 +08001008 sdmac->status = DMA_ERROR;
Sascha Hauer1ec1e822010-09-30 13:56:34 +00001009 return NULL;
1010}
1011
1012static struct dma_async_tx_descriptor *sdma_prep_dma_cyclic(
1013 struct dma_chan *chan, dma_addr_t dma_addr, size_t buf_len,
Alexandre Bounine185ecb52012-03-08 15:35:13 -05001014 size_t period_len, enum dma_transfer_direction direction,
Peter Ujfalusiec8b5e42012-09-14 15:05:47 +03001015 unsigned long flags, void *context)
Sascha Hauer1ec1e822010-09-30 13:56:34 +00001016{
1017 struct sdma_channel *sdmac = to_sdma_chan(chan);
1018 struct sdma_engine *sdma = sdmac->sdma;
1019 int num_periods = buf_len / period_len;
Sascha Hauer23889c62011-01-31 10:56:58 +01001020 int channel = sdmac->channel;
Sascha Hauer1ec1e822010-09-30 13:56:34 +00001021 int ret, i = 0, buf = 0;
1022
1023 dev_dbg(sdma->dev, "%s channel: %d\n", __func__, channel);
1024
1025 if (sdmac->status == DMA_IN_PROGRESS)
1026 return NULL;
1027
1028 sdmac->status = DMA_IN_PROGRESS;
1029
Richard Zhao8e2e27c2012-06-04 09:17:24 +08001030 sdmac->buf_tail = 0;
1031
Sascha Hauer1ec1e822010-09-30 13:56:34 +00001032 sdmac->flags |= IMX_DMA_SG_LOOP;
1033 sdmac->direction = direction;
1034 ret = sdma_load_context(sdmac);
1035 if (ret)
1036 goto err_out;
1037
1038 if (num_periods > NUM_BD) {
1039 dev_err(sdma->dev, "SDMA channel %d: maximum number of sg exceeded: %d > %d\n",
1040 channel, num_periods, NUM_BD);
1041 goto err_out;
1042 }
1043
1044 if (period_len > 0xffff) {
1045 dev_err(sdma->dev, "SDMA channel %d: maximum period size exceeded: %d > %d\n",
1046 channel, period_len, 0xffff);
1047 goto err_out;
1048 }
1049
1050 while (buf < buf_len) {
1051 struct sdma_buffer_descriptor *bd = &sdmac->bd[i];
1052 int param;
1053
1054 bd->buffer_addr = dma_addr;
1055
1056 bd->mode.count = period_len;
1057
1058 if (sdmac->word_size > DMA_SLAVE_BUSWIDTH_4_BYTES)
1059 goto err_out;
1060 if (sdmac->word_size == DMA_SLAVE_BUSWIDTH_4_BYTES)
1061 bd->mode.command = 0;
1062 else
1063 bd->mode.command = sdmac->word_size;
1064
1065 param = BD_DONE | BD_EXTD | BD_CONT | BD_INTR;
1066 if (i + 1 == num_periods)
1067 param |= BD_WRAP;
1068
1069 dev_dbg(sdma->dev, "entry %d: count: %d dma: 0x%08x %s%s\n",
1070 i, period_len, dma_addr,
1071 param & BD_WRAP ? "wrap" : "",
1072 param & BD_INTR ? " intr" : "");
1073
1074 bd->mode.status = param;
1075
1076 dma_addr += period_len;
1077 buf += period_len;
1078
1079 i++;
1080 }
1081
1082 sdmac->num_bd = num_periods;
1083 sdma->channel_control[channel].current_bd_ptr = sdmac->bd_phys;
1084
1085 return &sdmac->desc;
1086err_out:
1087 sdmac->status = DMA_ERROR;
1088 return NULL;
1089}
1090
1091static int sdma_control(struct dma_chan *chan, enum dma_ctrl_cmd cmd,
1092 unsigned long arg)
1093{
1094 struct sdma_channel *sdmac = to_sdma_chan(chan);
1095 struct dma_slave_config *dmaengine_cfg = (void *)arg;
1096
1097 switch (cmd) {
1098 case DMA_TERMINATE_ALL:
1099 sdma_disable_channel(sdmac);
1100 return 0;
1101 case DMA_SLAVE_CONFIG:
Vinod Kouldb8196d2011-10-13 22:34:23 +05301102 if (dmaengine_cfg->direction == DMA_DEV_TO_MEM) {
Sascha Hauer1ec1e822010-09-30 13:56:34 +00001103 sdmac->per_address = dmaengine_cfg->src_addr;
Philippe Rétornaz94ac27a2012-01-24 14:22:01 +01001104 sdmac->watermark_level = dmaengine_cfg->src_maxburst *
1105 dmaengine_cfg->src_addr_width;
Sascha Hauer1ec1e822010-09-30 13:56:34 +00001106 sdmac->word_size = dmaengine_cfg->src_addr_width;
1107 } else {
1108 sdmac->per_address = dmaengine_cfg->dst_addr;
Philippe Rétornaz94ac27a2012-01-24 14:22:01 +01001109 sdmac->watermark_level = dmaengine_cfg->dst_maxburst *
1110 dmaengine_cfg->dst_addr_width;
Sascha Hauer1ec1e822010-09-30 13:56:34 +00001111 sdmac->word_size = dmaengine_cfg->dst_addr_width;
1112 }
Huang Shijiee6966432011-11-18 16:38:02 +08001113 sdmac->direction = dmaengine_cfg->direction;
Sascha Hauer1ec1e822010-09-30 13:56:34 +00001114 return sdma_config_channel(sdmac);
1115 default:
1116 return -ENOSYS;
1117 }
1118
1119 return -EINVAL;
1120}
1121
1122static enum dma_status sdma_tx_status(struct dma_chan *chan,
1123 dma_cookie_t cookie,
1124 struct dma_tx_state *txstate)
1125{
1126 struct sdma_channel *sdmac = to_sdma_chan(chan);
1127 dma_cookie_t last_used;
Sascha Hauer1ec1e822010-09-30 13:56:34 +00001128
1129 last_used = chan->cookie;
1130
Russell King - ARM Linux4d4e58d2012-03-06 22:34:06 +00001131 dma_set_tx_state(txstate, chan->completed_cookie, last_used,
Huang Shijieab59a512011-12-02 10:16:25 +08001132 sdmac->chn_count - sdmac->chn_real_count);
Sascha Hauer1ec1e822010-09-30 13:56:34 +00001133
Shawn Guo8a965912011-01-20 05:50:37 +08001134 return sdmac->status;
Sascha Hauer1ec1e822010-09-30 13:56:34 +00001135}
1136
1137static void sdma_issue_pending(struct dma_chan *chan)
1138{
Sascha Hauer2b4f1302012-01-09 10:32:50 +01001139 struct sdma_channel *sdmac = to_sdma_chan(chan);
1140 struct sdma_engine *sdma = sdmac->sdma;
1141
1142 if (sdmac->status == DMA_IN_PROGRESS)
1143 sdma_enable_channel(sdma, sdmac->channel);
Sascha Hauer1ec1e822010-09-30 13:56:34 +00001144}
1145
Sascha Hauer5b28aa32010-10-06 15:41:15 +02001146#define SDMA_SCRIPT_ADDRS_ARRAY_SIZE_V1 34
1147
1148static void sdma_add_scripts(struct sdma_engine *sdma,
1149 const struct sdma_script_start_addrs *addr)
1150{
1151 s32 *addr_arr = (u32 *)addr;
1152 s32 *saddr_arr = (u32 *)sdma->script_addrs;
1153 int i;
1154
1155 for (i = 0; i < SDMA_SCRIPT_ADDRS_ARRAY_SIZE_V1; i++)
1156 if (addr_arr[i] > 0)
1157 saddr_arr[i] = addr_arr[i];
1158}
1159
Sascha Hauer7b4b88e2011-08-25 11:03:37 +02001160static void sdma_load_firmware(const struct firmware *fw, void *context)
Sascha Hauer5b28aa32010-10-06 15:41:15 +02001161{
Sascha Hauer7b4b88e2011-08-25 11:03:37 +02001162 struct sdma_engine *sdma = context;
Sascha Hauer5b28aa32010-10-06 15:41:15 +02001163 const struct sdma_firmware_header *header;
Sascha Hauer5b28aa32010-10-06 15:41:15 +02001164 const struct sdma_script_start_addrs *addr;
1165 unsigned short *ram_code;
1166
Sascha Hauer7b4b88e2011-08-25 11:03:37 +02001167 if (!fw) {
1168 dev_err(sdma->dev, "firmware not found\n");
1169 return;
1170 }
Sascha Hauer5b28aa32010-10-06 15:41:15 +02001171
1172 if (fw->size < sizeof(*header))
1173 goto err_firmware;
1174
1175 header = (struct sdma_firmware_header *)fw->data;
1176
1177 if (header->magic != SDMA_FIRMWARE_MAGIC)
1178 goto err_firmware;
1179 if (header->ram_code_start + header->ram_code_size > fw->size)
1180 goto err_firmware;
1181
1182 addr = (void *)header + header->script_addrs_start;
1183 ram_code = (void *)header + header->ram_code_start;
1184
Sascha Hauer7560e3f2012-03-07 09:30:06 +01001185 clk_enable(sdma->clk_ipg);
1186 clk_enable(sdma->clk_ahb);
Sascha Hauer5b28aa32010-10-06 15:41:15 +02001187 /* download the RAM image for SDMA */
1188 sdma_load_script(sdma, ram_code,
1189 header->ram_code_size,
Sascha Hauer6866fd32011-01-12 11:18:14 +01001190 addr->ram_code_start_addr);
Sascha Hauer7560e3f2012-03-07 09:30:06 +01001191 clk_disable(sdma->clk_ipg);
1192 clk_disable(sdma->clk_ahb);
Sascha Hauer5b28aa32010-10-06 15:41:15 +02001193
1194 sdma_add_scripts(sdma, addr);
1195
1196 dev_info(sdma->dev, "loaded firmware %d.%d\n",
1197 header->version_major,
1198 header->version_minor);
1199
1200err_firmware:
1201 release_firmware(fw);
Sascha Hauer7b4b88e2011-08-25 11:03:37 +02001202}
1203
1204static int __init sdma_get_firmware(struct sdma_engine *sdma,
1205 const char *fw_name)
1206{
1207 int ret;
1208
1209 ret = request_firmware_nowait(THIS_MODULE,
1210 FW_ACTION_HOTPLUG, fw_name, sdma->dev,
1211 GFP_KERNEL, sdma, sdma_load_firmware);
Sascha Hauer5b28aa32010-10-06 15:41:15 +02001212
1213 return ret;
1214}
1215
1216static int __init sdma_init(struct sdma_engine *sdma)
Sascha Hauer1ec1e822010-09-30 13:56:34 +00001217{
1218 int i, ret;
1219 dma_addr_t ccb_phys;
1220
Shawn Guo62550cd2011-07-13 21:33:17 +08001221 switch (sdma->devtype) {
1222 case IMX31_SDMA:
Sascha Hauer1ec1e822010-09-30 13:56:34 +00001223 sdma->num_events = 32;
1224 break;
Shawn Guo62550cd2011-07-13 21:33:17 +08001225 case IMX35_SDMA:
Sascha Hauer1ec1e822010-09-30 13:56:34 +00001226 sdma->num_events = 48;
1227 break;
1228 default:
Shawn Guo62550cd2011-07-13 21:33:17 +08001229 dev_err(sdma->dev, "Unknown sdma type %d. aborting\n",
1230 sdma->devtype);
Sascha Hauer1ec1e822010-09-30 13:56:34 +00001231 return -ENODEV;
1232 }
1233
Sascha Hauer7560e3f2012-03-07 09:30:06 +01001234 clk_enable(sdma->clk_ipg);
1235 clk_enable(sdma->clk_ahb);
Sascha Hauer1ec1e822010-09-30 13:56:34 +00001236
1237 /* Be sure SDMA has not started yet */
Richard Zhaoc4b56852012-01-13 11:09:57 +08001238 writel_relaxed(0, sdma->regs + SDMA_H_C0PTR);
Sascha Hauer1ec1e822010-09-30 13:56:34 +00001239
1240 sdma->channel_control = dma_alloc_coherent(NULL,
1241 MAX_DMA_CHANNELS * sizeof (struct sdma_channel_control) +
1242 sizeof(struct sdma_context_data),
1243 &ccb_phys, GFP_KERNEL);
1244
1245 if (!sdma->channel_control) {
1246 ret = -ENOMEM;
1247 goto err_dma_alloc;
1248 }
1249
1250 sdma->context = (void *)sdma->channel_control +
1251 MAX_DMA_CHANNELS * sizeof (struct sdma_channel_control);
1252 sdma->context_phys = ccb_phys +
1253 MAX_DMA_CHANNELS * sizeof (struct sdma_channel_control);
1254
1255 /* Zero-out the CCB structures array just allocated */
1256 memset(sdma->channel_control, 0,
1257 MAX_DMA_CHANNELS * sizeof (struct sdma_channel_control));
1258
1259 /* disable all channels */
1260 for (i = 0; i < sdma->num_events; i++)
Richard Zhaoc4b56852012-01-13 11:09:57 +08001261 writel_relaxed(0, sdma->regs + chnenbl_ofs(sdma, i));
Sascha Hauer1ec1e822010-09-30 13:56:34 +00001262
1263 /* All channels have priority 0 */
1264 for (i = 0; i < MAX_DMA_CHANNELS; i++)
Richard Zhaoc4b56852012-01-13 11:09:57 +08001265 writel_relaxed(0, sdma->regs + SDMA_CHNPRI_0 + i * 4);
Sascha Hauer1ec1e822010-09-30 13:56:34 +00001266
1267 ret = sdma_request_channel(&sdma->channel[0]);
1268 if (ret)
1269 goto err_dma_alloc;
1270
1271 sdma_config_ownership(&sdma->channel[0], false, true, false);
1272
1273 /* Set Command Channel (Channel Zero) */
Richard Zhaoc4b56852012-01-13 11:09:57 +08001274 writel_relaxed(0x4050, sdma->regs + SDMA_CHN0ADDR);
Sascha Hauer1ec1e822010-09-30 13:56:34 +00001275
1276 /* Set bits of CONFIG register but with static context switching */
1277 /* FIXME: Check whether to set ACR bit depending on clock ratios */
Richard Zhaoc4b56852012-01-13 11:09:57 +08001278 writel_relaxed(0, sdma->regs + SDMA_H_CONFIG);
Sascha Hauer1ec1e822010-09-30 13:56:34 +00001279
Richard Zhaoc4b56852012-01-13 11:09:57 +08001280 writel_relaxed(ccb_phys, sdma->regs + SDMA_H_C0PTR);
Sascha Hauer1ec1e822010-09-30 13:56:34 +00001281
Sascha Hauer1ec1e822010-09-30 13:56:34 +00001282 /* Set bits of CONFIG register with given context switching mode */
Richard Zhaoc4b56852012-01-13 11:09:57 +08001283 writel_relaxed(SDMA_H_CONFIG_CSM, sdma->regs + SDMA_H_CONFIG);
Sascha Hauer1ec1e822010-09-30 13:56:34 +00001284
1285 /* Initializes channel's priorities */
1286 sdma_set_channel_priority(&sdma->channel[0], 7);
1287
Sascha Hauer7560e3f2012-03-07 09:30:06 +01001288 clk_disable(sdma->clk_ipg);
1289 clk_disable(sdma->clk_ahb);
Sascha Hauer1ec1e822010-09-30 13:56:34 +00001290
1291 return 0;
1292
1293err_dma_alloc:
Sascha Hauer7560e3f2012-03-07 09:30:06 +01001294 clk_disable(sdma->clk_ipg);
1295 clk_disable(sdma->clk_ahb);
Sascha Hauer1ec1e822010-09-30 13:56:34 +00001296 dev_err(sdma->dev, "initialisation failed with %d\n", ret);
1297 return ret;
1298}
1299
Shawn Guo9479e172013-05-30 22:23:32 +08001300static bool sdma_filter_fn(struct dma_chan *chan, void *fn_param)
1301{
1302 struct imx_dma_data *data = fn_param;
1303
1304 if (!imx_dma_is_general_purpose(chan))
1305 return false;
1306
1307 chan->private = data;
1308
1309 return true;
1310}
1311
1312static struct dma_chan *sdma_xlate(struct of_phandle_args *dma_spec,
1313 struct of_dma *ofdma)
1314{
1315 struct sdma_engine *sdma = ofdma->of_dma_data;
1316 dma_cap_mask_t mask = sdma->dma_device.cap_mask;
1317 struct imx_dma_data data;
1318
1319 if (dma_spec->args_count != 3)
1320 return NULL;
1321
1322 data.dma_request = dma_spec->args[0];
1323 data.peripheral_type = dma_spec->args[1];
1324 data.priority = dma_spec->args[2];
1325
1326 return dma_request_channel(mask, sdma_filter_fn, &data);
1327}
1328
Sascha Hauer1ec1e822010-09-30 13:56:34 +00001329static int __init sdma_probe(struct platform_device *pdev)
1330{
Shawn Guo580975d2011-07-14 08:35:48 +08001331 const struct of_device_id *of_id =
1332 of_match_device(sdma_dt_ids, &pdev->dev);
1333 struct device_node *np = pdev->dev.of_node;
1334 const char *fw_name;
Sascha Hauer1ec1e822010-09-30 13:56:34 +00001335 int ret;
Sascha Hauer1ec1e822010-09-30 13:56:34 +00001336 int irq;
Sascha Hauer1ec1e822010-09-30 13:56:34 +00001337 struct resource *iores;
1338 struct sdma_platform_data *pdata = pdev->dev.platform_data;
Sascha Hauer1ec1e822010-09-30 13:56:34 +00001339 int i;
Sascha Hauer1ec1e822010-09-30 13:56:34 +00001340 struct sdma_engine *sdma;
Sascha Hauer36e2f212011-08-25 11:03:36 +02001341 s32 *saddr_arr;
Sascha Hauer1ec1e822010-09-30 13:56:34 +00001342
1343 sdma = kzalloc(sizeof(*sdma), GFP_KERNEL);
1344 if (!sdma)
1345 return -ENOMEM;
1346
Richard Zhao2ccaef02012-05-11 15:14:27 +08001347 spin_lock_init(&sdma->channel_0_lock);
Sascha Hauer73eab972011-08-25 11:03:35 +02001348
Sascha Hauer1ec1e822010-09-30 13:56:34 +00001349 sdma->dev = &pdev->dev;
1350
1351 iores = platform_get_resource(pdev, IORESOURCE_MEM, 0);
1352 irq = platform_get_irq(pdev, 0);
Shawn Guo580975d2011-07-14 08:35:48 +08001353 if (!iores || irq < 0) {
Sascha Hauer1ec1e822010-09-30 13:56:34 +00001354 ret = -EINVAL;
1355 goto err_irq;
1356 }
1357
1358 if (!request_mem_region(iores->start, resource_size(iores), pdev->name)) {
1359 ret = -EBUSY;
1360 goto err_request_region;
1361 }
1362
Sascha Hauer7560e3f2012-03-07 09:30:06 +01001363 sdma->clk_ipg = devm_clk_get(&pdev->dev, "ipg");
1364 if (IS_ERR(sdma->clk_ipg)) {
1365 ret = PTR_ERR(sdma->clk_ipg);
Sascha Hauer1ec1e822010-09-30 13:56:34 +00001366 goto err_clk;
1367 }
1368
Sascha Hauer7560e3f2012-03-07 09:30:06 +01001369 sdma->clk_ahb = devm_clk_get(&pdev->dev, "ahb");
1370 if (IS_ERR(sdma->clk_ahb)) {
1371 ret = PTR_ERR(sdma->clk_ahb);
1372 goto err_clk;
1373 }
1374
1375 clk_prepare(sdma->clk_ipg);
1376 clk_prepare(sdma->clk_ahb);
1377
Sascha Hauer1ec1e822010-09-30 13:56:34 +00001378 sdma->regs = ioremap(iores->start, resource_size(iores));
1379 if (!sdma->regs) {
1380 ret = -ENOMEM;
1381 goto err_ioremap;
1382 }
1383
1384 ret = request_irq(irq, sdma_int_handler, 0, "sdma", sdma);
1385 if (ret)
1386 goto err_request_irq;
1387
Sascha Hauer5b28aa32010-10-06 15:41:15 +02001388 sdma->script_addrs = kzalloc(sizeof(*sdma->script_addrs), GFP_KERNEL);
Axel Lin1c1d9542011-07-12 21:00:13 +08001389 if (!sdma->script_addrs) {
1390 ret = -ENOMEM;
Sascha Hauer5b28aa32010-10-06 15:41:15 +02001391 goto err_alloc;
Axel Lin1c1d9542011-07-12 21:00:13 +08001392 }
Sascha Hauer1ec1e822010-09-30 13:56:34 +00001393
Sascha Hauer36e2f212011-08-25 11:03:36 +02001394 /* initially no scripts available */
1395 saddr_arr = (s32 *)sdma->script_addrs;
1396 for (i = 0; i < SDMA_SCRIPT_ADDRS_ARRAY_SIZE_V1; i++)
1397 saddr_arr[i] = -EINVAL;
1398
Shawn Guo580975d2011-07-14 08:35:48 +08001399 if (of_id)
1400 pdev->id_entry = of_id->data;
Shawn Guo62550cd2011-07-13 21:33:17 +08001401 sdma->devtype = pdev->id_entry->driver_data;
Sascha Hauer1ec1e822010-09-30 13:56:34 +00001402
Sascha Hauer7214a8b2011-01-31 10:21:35 +01001403 dma_cap_set(DMA_SLAVE, sdma->dma_device.cap_mask);
1404 dma_cap_set(DMA_CYCLIC, sdma->dma_device.cap_mask);
1405
Sascha Hauer1ec1e822010-09-30 13:56:34 +00001406 INIT_LIST_HEAD(&sdma->dma_device.channels);
1407 /* Initialize channel parameters */
1408 for (i = 0; i < MAX_DMA_CHANNELS; i++) {
1409 struct sdma_channel *sdmac = &sdma->channel[i];
1410
1411 sdmac->sdma = sdma;
1412 spin_lock_init(&sdmac->lock);
1413
Sascha Hauer1ec1e822010-09-30 13:56:34 +00001414 sdmac->chan.device = &sdma->dma_device;
Russell King - ARM Linux8ac69542012-03-06 22:36:27 +00001415 dma_cookie_init(&sdmac->chan);
Sascha Hauer1ec1e822010-09-30 13:56:34 +00001416 sdmac->channel = i;
1417
Huang Shijieabd9ccc2012-04-28 18:15:42 +08001418 tasklet_init(&sdmac->tasklet, sdma_tasklet,
1419 (unsigned long) sdmac);
Sascha Hauer23889c62011-01-31 10:56:58 +01001420 /*
1421 * Add the channel to the DMAC list. Do not add channel 0 though
1422 * because we need it internally in the SDMA driver. This also means
1423 * that channel 0 in dmaengine counting matches sdma channel 1.
1424 */
1425 if (i)
1426 list_add_tail(&sdmac->chan.device_node,
1427 &sdma->dma_device.channels);
Sascha Hauer1ec1e822010-09-30 13:56:34 +00001428 }
1429
Sascha Hauer5b28aa32010-10-06 15:41:15 +02001430 ret = sdma_init(sdma);
Sascha Hauer1ec1e822010-09-30 13:56:34 +00001431 if (ret)
1432 goto err_init;
1433
Shawn Guo580975d2011-07-14 08:35:48 +08001434 if (pdata && pdata->script_addrs)
Sascha Hauer5b28aa32010-10-06 15:41:15 +02001435 sdma_add_scripts(sdma, pdata->script_addrs);
1436
Shawn Guo580975d2011-07-14 08:35:48 +08001437 if (pdata) {
Fabio Estevam6d0d7e22012-02-29 11:20:38 -03001438 ret = sdma_get_firmware(sdma, pdata->fw_name);
1439 if (ret)
Fabio Estevamad1122e2012-03-08 09:26:39 -03001440 dev_warn(&pdev->dev, "failed to get firmware from platform data\n");
Shawn Guo580975d2011-07-14 08:35:48 +08001441 } else {
1442 /*
1443 * Because that device tree does not encode ROM script address,
1444 * the RAM script in firmware is mandatory for device tree
1445 * probe, otherwise it fails.
1446 */
1447 ret = of_property_read_string(np, "fsl,sdma-ram-script-name",
1448 &fw_name);
Fabio Estevam6602b0d2012-02-29 11:20:37 -03001449 if (ret)
Fabio Estevamad1122e2012-03-08 09:26:39 -03001450 dev_warn(&pdev->dev, "failed to get firmware name\n");
Fabio Estevam6602b0d2012-02-29 11:20:37 -03001451 else {
1452 ret = sdma_get_firmware(sdma, fw_name);
1453 if (ret)
Fabio Estevamad1122e2012-03-08 09:26:39 -03001454 dev_warn(&pdev->dev, "failed to get firmware from device tree\n");
Shawn Guo580975d2011-07-14 08:35:48 +08001455 }
1456 }
Sascha Hauer5b28aa32010-10-06 15:41:15 +02001457
Sascha Hauer1ec1e822010-09-30 13:56:34 +00001458 sdma->dma_device.dev = &pdev->dev;
1459
1460 sdma->dma_device.device_alloc_chan_resources = sdma_alloc_chan_resources;
1461 sdma->dma_device.device_free_chan_resources = sdma_free_chan_resources;
1462 sdma->dma_device.device_tx_status = sdma_tx_status;
1463 sdma->dma_device.device_prep_slave_sg = sdma_prep_slave_sg;
1464 sdma->dma_device.device_prep_dma_cyclic = sdma_prep_dma_cyclic;
1465 sdma->dma_device.device_control = sdma_control;
1466 sdma->dma_device.device_issue_pending = sdma_issue_pending;
Sascha Hauerb9b3f822011-01-12 12:12:31 +01001467 sdma->dma_device.dev->dma_parms = &sdma->dma_parms;
1468 dma_set_max_seg_size(sdma->dma_device.dev, 65535);
Sascha Hauer1ec1e822010-09-30 13:56:34 +00001469
1470 ret = dma_async_device_register(&sdma->dma_device);
1471 if (ret) {
1472 dev_err(&pdev->dev, "unable to register\n");
1473 goto err_init;
1474 }
1475
Shawn Guo9479e172013-05-30 22:23:32 +08001476 if (np) {
1477 ret = of_dma_controller_register(np, sdma_xlate, sdma);
1478 if (ret) {
1479 dev_err(&pdev->dev, "failed to register controller\n");
1480 goto err_register;
1481 }
1482 }
1483
Sascha Hauer5b28aa32010-10-06 15:41:15 +02001484 dev_info(sdma->dev, "initialized\n");
Sascha Hauer1ec1e822010-09-30 13:56:34 +00001485
1486 return 0;
1487
Shawn Guo9479e172013-05-30 22:23:32 +08001488err_register:
1489 dma_async_device_unregister(&sdma->dma_device);
Sascha Hauer1ec1e822010-09-30 13:56:34 +00001490err_init:
1491 kfree(sdma->script_addrs);
Sascha Hauer5b28aa32010-10-06 15:41:15 +02001492err_alloc:
Sascha Hauer1ec1e822010-09-30 13:56:34 +00001493 free_irq(irq, sdma);
1494err_request_irq:
1495 iounmap(sdma->regs);
1496err_ioremap:
Sascha Hauer1ec1e822010-09-30 13:56:34 +00001497err_clk:
1498 release_mem_region(iores->start, resource_size(iores));
1499err_request_region:
1500err_irq:
1501 kfree(sdma);
Shawn Guo939fd4f2011-01-19 19:13:06 +08001502 return ret;
Sascha Hauer1ec1e822010-09-30 13:56:34 +00001503}
1504
Maxin B. John1d1bbd32013-02-20 02:07:04 +02001505static int sdma_remove(struct platform_device *pdev)
Sascha Hauer1ec1e822010-09-30 13:56:34 +00001506{
1507 return -EBUSY;
1508}
1509
1510static struct platform_driver sdma_driver = {
1511 .driver = {
1512 .name = "imx-sdma",
Shawn Guo580975d2011-07-14 08:35:48 +08001513 .of_match_table = sdma_dt_ids,
Sascha Hauer1ec1e822010-09-30 13:56:34 +00001514 },
Shawn Guo62550cd2011-07-13 21:33:17 +08001515 .id_table = sdma_devtypes,
Maxin B. John1d1bbd32013-02-20 02:07:04 +02001516 .remove = sdma_remove,
Sascha Hauer1ec1e822010-09-30 13:56:34 +00001517};
1518
1519static int __init sdma_module_init(void)
1520{
1521 return platform_driver_probe(&sdma_driver, sdma_probe);
1522}
Sascha Hauerc989a7f2010-12-06 11:09:57 +01001523module_init(sdma_module_init);
Sascha Hauer1ec1e822010-09-30 13:56:34 +00001524
1525MODULE_AUTHOR("Sascha Hauer, Pengutronix <s.hauer@pengutronix.de>");
1526MODULE_DESCRIPTION("i.MX SDMA driver");
1527MODULE_LICENSE("GPL");