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mpls_iptunnel: fix sparse warn: remove incorrect rcu_dereference
[linux/fpc-iii.git] / drivers / dma / imx-sdma.c
blob77b6aab04f47a7222b7a5ebed1ad3c8a3f62e723
1 /*
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>
21 #include <linux/module.h>
22 #include <linux/types.h>
23 #include <linux/bitops.h>
24 #include <linux/mm.h>
25 #include <linux/interrupt.h>
26 #include <linux/clk.h>
27 #include <linux/delay.h>
28 #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>
37 #include <linux/of.h>
38 #include <linux/of_device.h>
39 #include <linux/of_dma.h>
40
41 #include <asm/irq.h>
42 #include <linux/platform_data/dma-imx-sdma.h>
43 #include <linux/platform_data/dma-imx.h>
44
45 #include "dmaengine.h"
46
47 /* 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
74 #define SDMA_CHNENBL0_IMX35 0x200
75 #define SDMA_CHNENBL0_IMX31 0x080
76 #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 */
129 struct 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 */
138 struct 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 */
152 struct 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 */
170 struct 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 */
204 struct 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
233 struct sdma_engine;
234
235 /**
236 * struct sdma_channel - housekeeping for a SDMA channel
237 *
238 * @sdma pointer to the SDMA engine for this channel
239 * @channel the channel number, matches dmaengine chan_id + 1
240 * @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 * @num_bd max NUM_BD. number of descriptors currently handling
247 */
248 struct sdma_channel {
249 struct sdma_engine *sdma;
250 unsigned int channel;
251 enum dma_transfer_direction direction;
252 enum sdma_peripheral_type peripheral_type;
253 unsigned int event_id0;
254 unsigned int event_id1;
255 enum dma_slave_buswidth word_size;
256 unsigned int buf_tail;
257 unsigned int num_bd;
258 unsigned int period_len;
259 struct sdma_buffer_descriptor *bd;
260 dma_addr_t bd_phys;
261 unsigned int pc_from_device, pc_to_device;
262 unsigned long flags;
263 dma_addr_t per_address;
264 unsigned long event_mask[2];
265 unsigned long watermark_level;
266 u32 shp_addr, per_addr;
267 struct dma_chan chan;
268 spinlock_t lock;
269 struct dma_async_tx_descriptor desc;
270 enum dma_status status;
271 unsigned int chn_count;
272 unsigned int chn_real_count;
273 struct tasklet_struct tasklet;
274 struct imx_dma_data data;
275 };
276
277 #define IMX_DMA_SG_LOOP BIT(0)
278
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
284 #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 */
300 struct 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
310 struct sdma_driver_data {
311 int chnenbl0;
312 int num_events;
313 struct sdma_script_start_addrs *script_addrs;
314 };
315
316 struct sdma_engine {
317 struct device *dev;
318 struct device_dma_parameters dma_parms;
319 struct sdma_channel channel[MAX_DMA_CHANNELS];
320 struct sdma_channel_control *channel_control;
321 void __iomem *regs;
322 struct sdma_context_data *context;
323 dma_addr_t context_phys;
324 struct dma_device dma_device;
325 struct clk *clk_ipg;
326 struct clk *clk_ahb;
327 spinlock_t channel_0_lock;
328 u32 script_number;
329 struct sdma_script_start_addrs *script_addrs;
330 const struct sdma_driver_data *drvdata;
331 };
332
333 static struct sdma_driver_data sdma_imx31 = {
334 .chnenbl0 = SDMA_CHNENBL0_IMX31,
335 .num_events = 32,
336 };
337
338 static struct sdma_script_start_addrs sdma_script_imx25 = {
339 .ap_2_ap_addr = 729,
340 .uart_2_mcu_addr = 904,
341 .per_2_app_addr = 1255,
342 .mcu_2_app_addr = 834,
343 .uartsh_2_mcu_addr = 1120,
344 .per_2_shp_addr = 1329,
345 .mcu_2_shp_addr = 1048,
346 .ata_2_mcu_addr = 1560,
347 .mcu_2_ata_addr = 1479,
348 .app_2_per_addr = 1189,
349 .app_2_mcu_addr = 770,
350 .shp_2_per_addr = 1407,
351 .shp_2_mcu_addr = 979,
352 };
353
354 static struct sdma_driver_data sdma_imx25 = {
355 .chnenbl0 = SDMA_CHNENBL0_IMX35,
356 .num_events = 48,
357 .script_addrs = &sdma_script_imx25,
358 };
359
360 static struct sdma_driver_data sdma_imx35 = {
361 .chnenbl0 = SDMA_CHNENBL0_IMX35,
362 .num_events = 48,
363 };
364
365 static struct sdma_script_start_addrs sdma_script_imx51 = {
366 .ap_2_ap_addr = 642,
367 .uart_2_mcu_addr = 817,
368 .mcu_2_app_addr = 747,
369 .mcu_2_shp_addr = 961,
370 .ata_2_mcu_addr = 1473,
371 .mcu_2_ata_addr = 1392,
372 .app_2_per_addr = 1033,
373 .app_2_mcu_addr = 683,
374 .shp_2_per_addr = 1251,
375 .shp_2_mcu_addr = 892,
376 };
377
378 static struct sdma_driver_data sdma_imx51 = {
379 .chnenbl0 = SDMA_CHNENBL0_IMX35,
380 .num_events = 48,
381 .script_addrs = &sdma_script_imx51,
382 };
383
384 static struct sdma_script_start_addrs sdma_script_imx53 = {
385 .ap_2_ap_addr = 642,
386 .app_2_mcu_addr = 683,
387 .mcu_2_app_addr = 747,
388 .uart_2_mcu_addr = 817,
389 .shp_2_mcu_addr = 891,
390 .mcu_2_shp_addr = 960,
391 .uartsh_2_mcu_addr = 1032,
392 .spdif_2_mcu_addr = 1100,
393 .mcu_2_spdif_addr = 1134,
394 .firi_2_mcu_addr = 1193,
395 .mcu_2_firi_addr = 1290,
396 };
397
398 static struct sdma_driver_data sdma_imx53 = {
399 .chnenbl0 = SDMA_CHNENBL0_IMX35,
400 .num_events = 48,
401 .script_addrs = &sdma_script_imx53,
402 };
403
404 static struct sdma_script_start_addrs sdma_script_imx6q = {
405 .ap_2_ap_addr = 642,
406 .uart_2_mcu_addr = 817,
407 .mcu_2_app_addr = 747,
408 .per_2_per_addr = 6331,
409 .uartsh_2_mcu_addr = 1032,
410 .mcu_2_shp_addr = 960,
411 .app_2_mcu_addr = 683,
412 .shp_2_mcu_addr = 891,
413 .spdif_2_mcu_addr = 1100,
414 .mcu_2_spdif_addr = 1134,
415 };
416
417 static struct sdma_driver_data sdma_imx6q = {
418 .chnenbl0 = SDMA_CHNENBL0_IMX35,
419 .num_events = 48,
420 .script_addrs = &sdma_script_imx6q,
421 };
422
423 static const struct platform_device_id sdma_devtypes[] = {
424 {
425 .name = "imx25-sdma",
426 .driver_data = (unsigned long)&sdma_imx25,
427 }, {
428 .name = "imx31-sdma",
429 .driver_data = (unsigned long)&sdma_imx31,
430 }, {
431 .name = "imx35-sdma",
432 .driver_data = (unsigned long)&sdma_imx35,
433 }, {
434 .name = "imx51-sdma",
435 .driver_data = (unsigned long)&sdma_imx51,
436 }, {
437 .name = "imx53-sdma",
438 .driver_data = (unsigned long)&sdma_imx53,
439 }, {
440 .name = "imx6q-sdma",
441 .driver_data = (unsigned long)&sdma_imx6q,
442 }, {
443 /* sentinel */
444 }
445 };
446 MODULE_DEVICE_TABLE(platform, sdma_devtypes);
447
448 static const struct of_device_id sdma_dt_ids[] = {
449 { .compatible = "fsl,imx6q-sdma", .data = &sdma_imx6q, },
450 { .compatible = "fsl,imx53-sdma", .data = &sdma_imx53, },
451 { .compatible = "fsl,imx51-sdma", .data = &sdma_imx51, },
452 { .compatible = "fsl,imx35-sdma", .data = &sdma_imx35, },
453 { .compatible = "fsl,imx31-sdma", .data = &sdma_imx31, },
454 { .compatible = "fsl,imx25-sdma", .data = &sdma_imx25, },
455 { /* sentinel */ }
456 };
457 MODULE_DEVICE_TABLE(of, sdma_dt_ids);
458
459 #define SDMA_H_CONFIG_DSPDMA BIT(12) /* indicates if the DSPDMA is used */
460 #define SDMA_H_CONFIG_RTD_PINS BIT(11) /* indicates if Real-Time Debug pins are enabled */
461 #define SDMA_H_CONFIG_ACR BIT(4) /* indicates if AHB freq /core freq = 2 or 1 */
462 #define SDMA_H_CONFIG_CSM (3) /* indicates which context switch mode is selected*/
463
464 static inline u32 chnenbl_ofs(struct sdma_engine *sdma, unsigned int event)
465 {
466 u32 chnenbl0 = sdma->drvdata->chnenbl0;
467 return chnenbl0 + event * 4;
468 }
469
470 static int sdma_config_ownership(struct sdma_channel *sdmac,
471 bool event_override, bool mcu_override, bool dsp_override)
472 {
473 struct sdma_engine *sdma = sdmac->sdma;
474 int channel = sdmac->channel;
475 unsigned long evt, mcu, dsp;
476
477 if (event_override && mcu_override && dsp_override)
478 return -EINVAL;
479
480 evt = readl_relaxed(sdma->regs + SDMA_H_EVTOVR);
481 mcu = readl_relaxed(sdma->regs + SDMA_H_HOSTOVR);
482 dsp = readl_relaxed(sdma->regs + SDMA_H_DSPOVR);
483
484 if (dsp_override)
485 __clear_bit(channel, &dsp);
486 else
487 __set_bit(channel, &dsp);
488
489 if (event_override)
490 __clear_bit(channel, &evt);
491 else
492 __set_bit(channel, &evt);
493
494 if (mcu_override)
495 __clear_bit(channel, &mcu);
496 else
497 __set_bit(channel, &mcu);
498
499 writel_relaxed(evt, sdma->regs + SDMA_H_EVTOVR);
500 writel_relaxed(mcu, sdma->regs + SDMA_H_HOSTOVR);
501 writel_relaxed(dsp, sdma->regs + SDMA_H_DSPOVR);
502
503 return 0;
504 }
505
506 static void sdma_enable_channel(struct sdma_engine *sdma, int channel)
507 {
508 writel(BIT(channel), sdma->regs + SDMA_H_START);
509 }
510
511 /*
512 * sdma_run_channel0 - run a channel and wait till it's done
513 */
514 static int sdma_run_channel0(struct sdma_engine *sdma)
515 {
516 int ret;
517 unsigned long timeout = 500;
518
519 sdma_enable_channel(sdma, 0);
520
521 while (!(ret = readl_relaxed(sdma->regs + SDMA_H_INTR) & 1)) {
522 if (timeout-- <= 0)
523 break;
524 udelay(1);
525 }
526
527 if (ret) {
528 /* Clear the interrupt status */
529 writel_relaxed(ret, sdma->regs + SDMA_H_INTR);
530 } else {
531 dev_err(sdma->dev, "Timeout waiting for CH0 ready\n");
532 }
533
534 /* Set bits of CONFIG register with dynamic context switching */
535 if (readl(sdma->regs + SDMA_H_CONFIG) == 0)
536 writel_relaxed(SDMA_H_CONFIG_CSM, sdma->regs + SDMA_H_CONFIG);
537
538 return ret ? 0 : -ETIMEDOUT;
539 }
540
541 static int sdma_load_script(struct sdma_engine *sdma, void *buf, int size,
542 u32 address)
543 {
544 struct sdma_buffer_descriptor *bd0 = sdma->channel[0].bd;
545 void *buf_virt;
546 dma_addr_t buf_phys;
547 int ret;
548 unsigned long flags;
549
550 buf_virt = dma_alloc_coherent(NULL,
551 size,
552 &buf_phys, GFP_KERNEL);
553 if (!buf_virt) {
554 return -ENOMEM;
555 }
556
557 spin_lock_irqsave(&sdma->channel_0_lock, flags);
558
559 bd0->mode.command = C0_SETPM;
560 bd0->mode.status = BD_DONE | BD_INTR | BD_WRAP | BD_EXTD;
561 bd0->mode.count = size / 2;
562 bd0->buffer_addr = buf_phys;
563 bd0->ext_buffer_addr = address;
564
565 memcpy(buf_virt, buf, size);
566
567 ret = sdma_run_channel0(sdma);
568
569 spin_unlock_irqrestore(&sdma->channel_0_lock, flags);
570
571 dma_free_coherent(NULL, size, buf_virt, buf_phys);
572
573 return ret;
574 }
575
576 static void sdma_event_enable(struct sdma_channel *sdmac, unsigned int event)
577 {
578 struct sdma_engine *sdma = sdmac->sdma;
579 int channel = sdmac->channel;
580 unsigned long val;
581 u32 chnenbl = chnenbl_ofs(sdma, event);
582
583 val = readl_relaxed(sdma->regs + chnenbl);
584 __set_bit(channel, &val);
585 writel_relaxed(val, sdma->regs + chnenbl);
586 }
587
588 static void sdma_event_disable(struct sdma_channel *sdmac, unsigned int event)
589 {
590 struct sdma_engine *sdma = sdmac->sdma;
591 int channel = sdmac->channel;
592 u32 chnenbl = chnenbl_ofs(sdma, event);
593 unsigned long val;
594
595 val = readl_relaxed(sdma->regs + chnenbl);
596 __clear_bit(channel, &val);
597 writel_relaxed(val, sdma->regs + chnenbl);
598 }
599
600 static void sdma_handle_channel_loop(struct sdma_channel *sdmac)
601 {
602 if (sdmac->desc.callback)
603 sdmac->desc.callback(sdmac->desc.callback_param);
604 }
605
606 static void sdma_update_channel_loop(struct sdma_channel *sdmac)
607 {
608 struct sdma_buffer_descriptor *bd;
609
610 /*
611 * loop mode. Iterate over descriptors, re-setup them and
612 * call callback function.
613 */
614 while (1) {
615 bd = &sdmac->bd[sdmac->buf_tail];
616
617 if (bd->mode.status & BD_DONE)
618 break;
619
620 if (bd->mode.status & BD_RROR)
621 sdmac->status = DMA_ERROR;
622
623 bd->mode.status |= BD_DONE;
624 sdmac->buf_tail++;
625 sdmac->buf_tail %= sdmac->num_bd;
626 }
627 }
628
629 static void mxc_sdma_handle_channel_normal(struct sdma_channel *sdmac)
630 {
631 struct sdma_buffer_descriptor *bd;
632 int i, error = 0;
633
634 sdmac->chn_real_count = 0;
635 /*
636 * non loop mode. Iterate over all descriptors, collect
637 * errors and call callback function
638 */
639 for (i = 0; i < sdmac->num_bd; i++) {
640 bd = &sdmac->bd[i];
641
642 if (bd->mode.status & (BD_DONE | BD_RROR))
643 error = -EIO;
644 sdmac->chn_real_count += bd->mode.count;
645 }
646
647 if (error)
648 sdmac->status = DMA_ERROR;
649 else
650 sdmac->status = DMA_COMPLETE;
651
652 dma_cookie_complete(&sdmac->desc);
653 if (sdmac->desc.callback)
654 sdmac->desc.callback(sdmac->desc.callback_param);
655 }
656
657 static void sdma_tasklet(unsigned long data)
658 {
659 struct sdma_channel *sdmac = (struct sdma_channel *) data;
660
661 if (sdmac->flags & IMX_DMA_SG_LOOP)
662 sdma_handle_channel_loop(sdmac);
663 else
664 mxc_sdma_handle_channel_normal(sdmac);
665 }
666
667 static irqreturn_t sdma_int_handler(int irq, void *dev_id)
668 {
669 struct sdma_engine *sdma = dev_id;
670 unsigned long stat;
671
672 stat = readl_relaxed(sdma->regs + SDMA_H_INTR);
673 /* not interested in channel 0 interrupts */
674 stat &= ~1;
675 writel_relaxed(stat, sdma->regs + SDMA_H_INTR);
676
677 while (stat) {
678 int channel = fls(stat) - 1;
679 struct sdma_channel *sdmac = &sdma->channel[channel];
680
681 if (sdmac->flags & IMX_DMA_SG_LOOP)
682 sdma_update_channel_loop(sdmac);
683
684 tasklet_schedule(&sdmac->tasklet);
685
686 __clear_bit(channel, &stat);
687 }
688
689 return IRQ_HANDLED;
690 }
691
692 /*
693 * sets the pc of SDMA script according to the peripheral type
694 */
695 static void sdma_get_pc(struct sdma_channel *sdmac,
696 enum sdma_peripheral_type peripheral_type)
697 {
698 struct sdma_engine *sdma = sdmac->sdma;
699 int per_2_emi = 0, emi_2_per = 0;
700 /*
701 * These are needed once we start to support transfers between
702 * two peripherals or memory-to-memory transfers
703 */
704 int per_2_per = 0, emi_2_emi = 0;
705
706 sdmac->pc_from_device = 0;
707 sdmac->pc_to_device = 0;
708
709 switch (peripheral_type) {
710 case IMX_DMATYPE_MEMORY:
711 emi_2_emi = sdma->script_addrs->ap_2_ap_addr;
712 break;
713 case IMX_DMATYPE_DSP:
714 emi_2_per = sdma->script_addrs->bp_2_ap_addr;
715 per_2_emi = sdma->script_addrs->ap_2_bp_addr;
716 break;
717 case IMX_DMATYPE_FIRI:
718 per_2_emi = sdma->script_addrs->firi_2_mcu_addr;
719 emi_2_per = sdma->script_addrs->mcu_2_firi_addr;
720 break;
721 case IMX_DMATYPE_UART:
722 per_2_emi = sdma->script_addrs->uart_2_mcu_addr;
723 emi_2_per = sdma->script_addrs->mcu_2_app_addr;
724 break;
725 case IMX_DMATYPE_UART_SP:
726 per_2_emi = sdma->script_addrs->uartsh_2_mcu_addr;
727 emi_2_per = sdma->script_addrs->mcu_2_shp_addr;
728 break;
729 case IMX_DMATYPE_ATA:
730 per_2_emi = sdma->script_addrs->ata_2_mcu_addr;
731 emi_2_per = sdma->script_addrs->mcu_2_ata_addr;
732 break;
733 case IMX_DMATYPE_CSPI:
734 case IMX_DMATYPE_EXT:
735 case IMX_DMATYPE_SSI:
736 case IMX_DMATYPE_SAI:
737 per_2_emi = sdma->script_addrs->app_2_mcu_addr;
738 emi_2_per = sdma->script_addrs->mcu_2_app_addr;
739 break;
740 case IMX_DMATYPE_SSI_DUAL:
741 per_2_emi = sdma->script_addrs->ssish_2_mcu_addr;
742 emi_2_per = sdma->script_addrs->mcu_2_ssish_addr;
743 break;
744 case IMX_DMATYPE_SSI_SP:
745 case IMX_DMATYPE_MMC:
746 case IMX_DMATYPE_SDHC:
747 case IMX_DMATYPE_CSPI_SP:
748 case IMX_DMATYPE_ESAI:
749 case IMX_DMATYPE_MSHC_SP:
750 per_2_emi = sdma->script_addrs->shp_2_mcu_addr;
751 emi_2_per = sdma->script_addrs->mcu_2_shp_addr;
752 break;
753 case IMX_DMATYPE_ASRC:
754 per_2_emi = sdma->script_addrs->asrc_2_mcu_addr;
755 emi_2_per = sdma->script_addrs->asrc_2_mcu_addr;
756 per_2_per = sdma->script_addrs->per_2_per_addr;
757 break;
758 case IMX_DMATYPE_ASRC_SP:
759 per_2_emi = sdma->script_addrs->shp_2_mcu_addr;
760 emi_2_per = sdma->script_addrs->mcu_2_shp_addr;
761 per_2_per = sdma->script_addrs->per_2_per_addr;
762 break;
763 case IMX_DMATYPE_MSHC:
764 per_2_emi = sdma->script_addrs->mshc_2_mcu_addr;
765 emi_2_per = sdma->script_addrs->mcu_2_mshc_addr;
766 break;
767 case IMX_DMATYPE_CCM:
768 per_2_emi = sdma->script_addrs->dptc_dvfs_addr;
769 break;
770 case IMX_DMATYPE_SPDIF:
771 per_2_emi = sdma->script_addrs->spdif_2_mcu_addr;
772 emi_2_per = sdma->script_addrs->mcu_2_spdif_addr;
773 break;
774 case IMX_DMATYPE_IPU_MEMORY:
775 emi_2_per = sdma->script_addrs->ext_mem_2_ipu_addr;
776 break;
777 default:
778 break;
779 }
780
781 sdmac->pc_from_device = per_2_emi;
782 sdmac->pc_to_device = emi_2_per;
783 }
784
785 static int sdma_load_context(struct sdma_channel *sdmac)
786 {
787 struct sdma_engine *sdma = sdmac->sdma;
788 int channel = sdmac->channel;
789 int load_address;
790 struct sdma_context_data *context = sdma->context;
791 struct sdma_buffer_descriptor *bd0 = sdma->channel[0].bd;
792 int ret;
793 unsigned long flags;
794
795 if (sdmac->direction == DMA_DEV_TO_MEM) {
796 load_address = sdmac->pc_from_device;
797 } else {
798 load_address = sdmac->pc_to_device;
799 }
800
801 if (load_address < 0)
802 return load_address;
803
804 dev_dbg(sdma->dev, "load_address = %d\n", load_address);
805 dev_dbg(sdma->dev, "wml = 0x%08x\n", (u32)sdmac->watermark_level);
806 dev_dbg(sdma->dev, "shp_addr = 0x%08x\n", sdmac->shp_addr);
807 dev_dbg(sdma->dev, "per_addr = 0x%08x\n", sdmac->per_addr);
808 dev_dbg(sdma->dev, "event_mask0 = 0x%08x\n", (u32)sdmac->event_mask[0]);
809 dev_dbg(sdma->dev, "event_mask1 = 0x%08x\n", (u32)sdmac->event_mask[1]);
810
811 spin_lock_irqsave(&sdma->channel_0_lock, flags);
812
813 memset(context, 0, sizeof(*context));
814 context->channel_state.pc = load_address;
815
816 /* Send by context the event mask,base address for peripheral
817 * and watermark level
818 */
819 context->gReg[0] = sdmac->event_mask[1];
820 context->gReg[1] = sdmac->event_mask[0];
821 context->gReg[2] = sdmac->per_addr;
822 context->gReg[6] = sdmac->shp_addr;
823 context->gReg[7] = sdmac->watermark_level;
824
825 bd0->mode.command = C0_SETDM;
826 bd0->mode.status = BD_DONE | BD_INTR | BD_WRAP | BD_EXTD;
827 bd0->mode.count = sizeof(*context) / 4;
828 bd0->buffer_addr = sdma->context_phys;
829 bd0->ext_buffer_addr = 2048 + (sizeof(*context) / 4) * channel;
830 ret = sdma_run_channel0(sdma);
831
832 spin_unlock_irqrestore(&sdma->channel_0_lock, flags);
833
834 return ret;
835 }
836
837 static struct sdma_channel *to_sdma_chan(struct dma_chan *chan)
838 {
839 return container_of(chan, struct sdma_channel, chan);
840 }
841
842 static int sdma_disable_channel(struct dma_chan *chan)
843 {
844 struct sdma_channel *sdmac = to_sdma_chan(chan);
845 struct sdma_engine *sdma = sdmac->sdma;
846 int channel = sdmac->channel;
847
848 writel_relaxed(BIT(channel), sdma->regs + SDMA_H_STATSTOP);
849 sdmac->status = DMA_ERROR;
850
851 return 0;
852 }
853
854 static int sdma_config_channel(struct dma_chan *chan)
855 {
856 struct sdma_channel *sdmac = to_sdma_chan(chan);
857 int ret;
858
859 sdma_disable_channel(chan);
860
861 sdmac->event_mask[0] = 0;
862 sdmac->event_mask[1] = 0;
863 sdmac->shp_addr = 0;
864 sdmac->per_addr = 0;
865
866 if (sdmac->event_id0) {
867 if (sdmac->event_id0 >= sdmac->sdma->drvdata->num_events)
868 return -EINVAL;
869 sdma_event_enable(sdmac, sdmac->event_id0);
870 }
871
872 switch (sdmac->peripheral_type) {
873 case IMX_DMATYPE_DSP:
874 sdma_config_ownership(sdmac, false, true, true);
875 break;
876 case IMX_DMATYPE_MEMORY:
877 sdma_config_ownership(sdmac, false, true, false);
878 break;
879 default:
880 sdma_config_ownership(sdmac, true, true, false);
881 break;
882 }
883
884 sdma_get_pc(sdmac, sdmac->peripheral_type);
885
886 if ((sdmac->peripheral_type != IMX_DMATYPE_MEMORY) &&
887 (sdmac->peripheral_type != IMX_DMATYPE_DSP)) {
888 /* Handle multiple event channels differently */
889 if (sdmac->event_id1) {
890 sdmac->event_mask[1] = BIT(sdmac->event_id1 % 32);
891 if (sdmac->event_id1 > 31)
892 __set_bit(31, &sdmac->watermark_level);
893 sdmac->event_mask[0] = BIT(sdmac->event_id0 % 32);
894 if (sdmac->event_id0 > 31)
895 __set_bit(30, &sdmac->watermark_level);
896 } else {
897 __set_bit(sdmac->event_id0, sdmac->event_mask);
898 }
899 /* Watermark Level */
900 sdmac->watermark_level |= sdmac->watermark_level;
901 /* Address */
902 sdmac->shp_addr = sdmac->per_address;
903 } else {
904 sdmac->watermark_level = 0; /* FIXME: M3_BASE_ADDRESS */
905 }
906
907 ret = sdma_load_context(sdmac);
908
909 return ret;
910 }
911
912 static int sdma_set_channel_priority(struct sdma_channel *sdmac,
913 unsigned int priority)
914 {
915 struct sdma_engine *sdma = sdmac->sdma;
916 int channel = sdmac->channel;
917
918 if (priority < MXC_SDMA_MIN_PRIORITY
919 || priority > MXC_SDMA_MAX_PRIORITY) {
920 return -EINVAL;
921 }
922
923 writel_relaxed(priority, sdma->regs + SDMA_CHNPRI_0 + 4 * channel);
924
925 return 0;
926 }
927
928 static int sdma_request_channel(struct sdma_channel *sdmac)
929 {
930 struct sdma_engine *sdma = sdmac->sdma;
931 int channel = sdmac->channel;
932 int ret = -EBUSY;
933
934 sdmac->bd = dma_zalloc_coherent(NULL, PAGE_SIZE, &sdmac->bd_phys,
935 GFP_KERNEL);
936 if (!sdmac->bd) {
937 ret = -ENOMEM;
938 goto out;
939 }
940
941 sdma->channel_control[channel].base_bd_ptr = sdmac->bd_phys;
942 sdma->channel_control[channel].current_bd_ptr = sdmac->bd_phys;
943
944 sdma_set_channel_priority(sdmac, MXC_SDMA_DEFAULT_PRIORITY);
945 return 0;
946 out:
947
948 return ret;
949 }
950
951 static dma_cookie_t sdma_tx_submit(struct dma_async_tx_descriptor *tx)
952 {
953 unsigned long flags;
954 struct sdma_channel *sdmac = to_sdma_chan(tx->chan);
955 dma_cookie_t cookie;
956
957 spin_lock_irqsave(&sdmac->lock, flags);
958
959 cookie = dma_cookie_assign(tx);
960
961 spin_unlock_irqrestore(&sdmac->lock, flags);
962
963 return cookie;
964 }
965
966 static int sdma_alloc_chan_resources(struct dma_chan *chan)
967 {
968 struct sdma_channel *sdmac = to_sdma_chan(chan);
969 struct imx_dma_data *data = chan->private;
970 int prio, ret;
971
972 if (!data)
973 return -EINVAL;
974
975 switch (data->priority) {
976 case DMA_PRIO_HIGH:
977 prio = 3;
978 break;
979 case DMA_PRIO_MEDIUM:
980 prio = 2;
981 break;
982 case DMA_PRIO_LOW:
983 default:
984 prio = 1;
985 break;
986 }
987
988 sdmac->peripheral_type = data->peripheral_type;
989 sdmac->event_id0 = data->dma_request;
990
991 clk_enable(sdmac->sdma->clk_ipg);
992 clk_enable(sdmac->sdma->clk_ahb);
993
994 ret = sdma_request_channel(sdmac);
995 if (ret)
996 return ret;
997
998 ret = sdma_set_channel_priority(sdmac, prio);
999 if (ret)
1000 return ret;
1001
1002 dma_async_tx_descriptor_init(&sdmac->desc, chan);
1003 sdmac->desc.tx_submit = sdma_tx_submit;
1004 /* txd.flags will be overwritten in prep funcs */
1005 sdmac->desc.flags = DMA_CTRL_ACK;
1006
1007 return 0;
1008 }
1009
1010 static void sdma_free_chan_resources(struct dma_chan *chan)
1011 {
1012 struct sdma_channel *sdmac = to_sdma_chan(chan);
1013 struct sdma_engine *sdma = sdmac->sdma;
1014
1015 sdma_disable_channel(chan);
1016
1017 if (sdmac->event_id0)
1018 sdma_event_disable(sdmac, sdmac->event_id0);
1019 if (sdmac->event_id1)
1020 sdma_event_disable(sdmac, sdmac->event_id1);
1021
1022 sdmac->event_id0 = 0;
1023 sdmac->event_id1 = 0;
1024
1025 sdma_set_channel_priority(sdmac, 0);
1026
1027 dma_free_coherent(NULL, PAGE_SIZE, sdmac->bd, sdmac->bd_phys);
1028
1029 clk_disable(sdma->clk_ipg);
1030 clk_disable(sdma->clk_ahb);
1031 }
1032
1033 static struct dma_async_tx_descriptor *sdma_prep_slave_sg(
1034 struct dma_chan *chan, struct scatterlist *sgl,
1035 unsigned int sg_len, enum dma_transfer_direction direction,
1036 unsigned long flags, void *context)
1037 {
1038 struct sdma_channel *sdmac = to_sdma_chan(chan);
1039 struct sdma_engine *sdma = sdmac->sdma;
1040 int ret, i, count;
1041 int channel = sdmac->channel;
1042 struct scatterlist *sg;
1043
1044 if (sdmac->status == DMA_IN_PROGRESS)
1045 return NULL;
1046 sdmac->status = DMA_IN_PROGRESS;
1047
1048 sdmac->flags = 0;
1049
1050 sdmac->buf_tail = 0;
1051
1052 dev_dbg(sdma->dev, "setting up %d entries for channel %d.\n",
1053 sg_len, channel);
1054
1055 sdmac->direction = direction;
1056 ret = sdma_load_context(sdmac);
1057 if (ret)
1058 goto err_out;
1059
1060 if (sg_len > NUM_BD) {
1061 dev_err(sdma->dev, "SDMA channel %d: maximum number of sg exceeded: %d > %d\n",
1062 channel, sg_len, NUM_BD);
1063 ret = -EINVAL;
1064 goto err_out;
1065 }
1066
1067 sdmac->chn_count = 0;
1068 for_each_sg(sgl, sg, sg_len, i) {
1069 struct sdma_buffer_descriptor *bd = &sdmac->bd[i];
1070 int param;
1071
1072 bd->buffer_addr = sg->dma_address;
1073
1074 count = sg_dma_len(sg);
1075
1076 if (count > 0xffff) {
1077 dev_err(sdma->dev, "SDMA channel %d: maximum bytes for sg entry exceeded: %d > %d\n",
1078 channel, count, 0xffff);
1079 ret = -EINVAL;
1080 goto err_out;
1081 }
1082
1083 bd->mode.count = count;
1084 sdmac->chn_count += count;
1085
1086 if (sdmac->word_size > DMA_SLAVE_BUSWIDTH_4_BYTES) {
1087 ret = -EINVAL;
1088 goto err_out;
1089 }
1090
1091 switch (sdmac->word_size) {
1092 case DMA_SLAVE_BUSWIDTH_4_BYTES:
1093 bd->mode.command = 0;
1094 if (count & 3 || sg->dma_address & 3)
1095 return NULL;
1096 break;
1097 case DMA_SLAVE_BUSWIDTH_2_BYTES:
1098 bd->mode.command = 2;
1099 if (count & 1 || sg->dma_address & 1)
1100 return NULL;
1101 break;
1102 case DMA_SLAVE_BUSWIDTH_1_BYTE:
1103 bd->mode.command = 1;
1104 break;
1105 default:
1106 return NULL;
1107 }
1108
1109 param = BD_DONE | BD_EXTD | BD_CONT;
1110
1111 if (i + 1 == sg_len) {
1112 param |= BD_INTR;
1113 param |= BD_LAST;
1114 param &= ~BD_CONT;
1115 }
1116
1117 dev_dbg(sdma->dev, "entry %d: count: %d dma: %#llx %s%s\n",
1118 i, count, (u64)sg->dma_address,
1119 param & BD_WRAP ? "wrap" : "",
1120 param & BD_INTR ? " intr" : "");
1121
1122 bd->mode.status = param;
1123 }
1124
1125 sdmac->num_bd = sg_len;
1126 sdma->channel_control[channel].current_bd_ptr = sdmac->bd_phys;
1127
1128 return &sdmac->desc;
1129 err_out:
1130 sdmac->status = DMA_ERROR;
1131 return NULL;
1132 }
1133
1134 static struct dma_async_tx_descriptor *sdma_prep_dma_cyclic(
1135 struct dma_chan *chan, dma_addr_t dma_addr, size_t buf_len,
1136 size_t period_len, enum dma_transfer_direction direction,
1137 unsigned long flags)
1138 {
1139 struct sdma_channel *sdmac = to_sdma_chan(chan);
1140 struct sdma_engine *sdma = sdmac->sdma;
1141 int num_periods = buf_len / period_len;
1142 int channel = sdmac->channel;
1143 int ret, i = 0, buf = 0;
1144
1145 dev_dbg(sdma->dev, "%s channel: %d\n", __func__, channel);
1146
1147 if (sdmac->status == DMA_IN_PROGRESS)
1148 return NULL;
1149
1150 sdmac->status = DMA_IN_PROGRESS;
1151
1152 sdmac->buf_tail = 0;
1153 sdmac->period_len = period_len;
1154
1155 sdmac->flags |= IMX_DMA_SG_LOOP;
1156 sdmac->direction = direction;
1157 ret = sdma_load_context(sdmac);
1158 if (ret)
1159 goto err_out;
1160
1161 if (num_periods > NUM_BD) {
1162 dev_err(sdma->dev, "SDMA channel %d: maximum number of sg exceeded: %d > %d\n",
1163 channel, num_periods, NUM_BD);
1164 goto err_out;
1165 }
1166
1167 if (period_len > 0xffff) {
1168 dev_err(sdma->dev, "SDMA channel %d: maximum period size exceeded: %d > %d\n",
1169 channel, period_len, 0xffff);
1170 goto err_out;
1171 }
1172
1173 while (buf < buf_len) {
1174 struct sdma_buffer_descriptor *bd = &sdmac->bd[i];
1175 int param;
1176
1177 bd->buffer_addr = dma_addr;
1178
1179 bd->mode.count = period_len;
1180
1181 if (sdmac->word_size > DMA_SLAVE_BUSWIDTH_4_BYTES)
1182 goto err_out;
1183 if (sdmac->word_size == DMA_SLAVE_BUSWIDTH_4_BYTES)
1184 bd->mode.command = 0;
1185 else
1186 bd->mode.command = sdmac->word_size;
1187
1188 param = BD_DONE | BD_EXTD | BD_CONT | BD_INTR;
1189 if (i + 1 == num_periods)
1190 param |= BD_WRAP;
1191
1192 dev_dbg(sdma->dev, "entry %d: count: %d dma: %#llx %s%s\n",
1193 i, period_len, (u64)dma_addr,
1194 param & BD_WRAP ? "wrap" : "",
1195 param & BD_INTR ? " intr" : "");
1196
1197 bd->mode.status = param;
1198
1199 dma_addr += period_len;
1200 buf += period_len;
1201
1202 i++;
1203 }
1204
1205 sdmac->num_bd = num_periods;
1206 sdma->channel_control[channel].current_bd_ptr = sdmac->bd_phys;
1207
1208 return &sdmac->desc;
1209 err_out:
1210 sdmac->status = DMA_ERROR;
1211 return NULL;
1212 }
1213
1214 static int sdma_config(struct dma_chan *chan,
1215 struct dma_slave_config *dmaengine_cfg)
1216 {
1217 struct sdma_channel *sdmac = to_sdma_chan(chan);
1218
1219 if (dmaengine_cfg->direction == DMA_DEV_TO_MEM) {
1220 sdmac->per_address = dmaengine_cfg->src_addr;
1221 sdmac->watermark_level = dmaengine_cfg->src_maxburst *
1222 dmaengine_cfg->src_addr_width;
1223 sdmac->word_size = dmaengine_cfg->src_addr_width;
1224 } else {
1225 sdmac->per_address = dmaengine_cfg->dst_addr;
1226 sdmac->watermark_level = dmaengine_cfg->dst_maxburst *
1227 dmaengine_cfg->dst_addr_width;
1228 sdmac->word_size = dmaengine_cfg->dst_addr_width;
1229 }
1230 sdmac->direction = dmaengine_cfg->direction;
1231 return sdma_config_channel(chan);
1232 }
1233
1234 static enum dma_status sdma_tx_status(struct dma_chan *chan,
1235 dma_cookie_t cookie,
1236 struct dma_tx_state *txstate)
1237 {
1238 struct sdma_channel *sdmac = to_sdma_chan(chan);
1239 u32 residue;
1240
1241 if (sdmac->flags & IMX_DMA_SG_LOOP)
1242 residue = (sdmac->num_bd - sdmac->buf_tail) * sdmac->period_len;
1243 else
1244 residue = sdmac->chn_count - sdmac->chn_real_count;
1245
1246 dma_set_tx_state(txstate, chan->completed_cookie, chan->cookie,
1247 residue);
1248
1249 return sdmac->status;
1250 }
1251
1252 static void sdma_issue_pending(struct dma_chan *chan)
1253 {
1254 struct sdma_channel *sdmac = to_sdma_chan(chan);
1255 struct sdma_engine *sdma = sdmac->sdma;
1256
1257 if (sdmac->status == DMA_IN_PROGRESS)
1258 sdma_enable_channel(sdma, sdmac->channel);
1259 }
1260
1261 #define SDMA_SCRIPT_ADDRS_ARRAY_SIZE_V1 34
1262 #define SDMA_SCRIPT_ADDRS_ARRAY_SIZE_V2 38
1263 #define SDMA_SCRIPT_ADDRS_ARRAY_SIZE_V3 41
1264
1265 static void sdma_add_scripts(struct sdma_engine *sdma,
1266 const struct sdma_script_start_addrs *addr)
1267 {
1268 s32 *addr_arr = (u32 *)addr;
1269 s32 *saddr_arr = (u32 *)sdma->script_addrs;
1270 int i;
1271
1272 /* use the default firmware in ROM if missing external firmware */
1273 if (!sdma->script_number)
1274 sdma->script_number = SDMA_SCRIPT_ADDRS_ARRAY_SIZE_V1;
1275
1276 for (i = 0; i < sdma->script_number; i++)
1277 if (addr_arr[i] > 0)
1278 saddr_arr[i] = addr_arr[i];
1279 }
1280
1281 static void sdma_load_firmware(const struct firmware *fw, void *context)
1282 {
1283 struct sdma_engine *sdma = context;
1284 const struct sdma_firmware_header *header;
1285 const struct sdma_script_start_addrs *addr;
1286 unsigned short *ram_code;
1287
1288 if (!fw) {
1289 dev_info(sdma->dev, "external firmware not found, using ROM firmware\n");
1290 /* In this case we just use the ROM firmware. */
1291 return;
1292 }
1293
1294 if (fw->size < sizeof(*header))
1295 goto err_firmware;
1296
1297 header = (struct sdma_firmware_header *)fw->data;
1298
1299 if (header->magic != SDMA_FIRMWARE_MAGIC)
1300 goto err_firmware;
1301 if (header->ram_code_start + header->ram_code_size > fw->size)
1302 goto err_firmware;
1303 switch (header->version_major) {
1304 case 1:
1305 sdma->script_number = SDMA_SCRIPT_ADDRS_ARRAY_SIZE_V1;
1306 break;
1307 case 2:
1308 sdma->script_number = SDMA_SCRIPT_ADDRS_ARRAY_SIZE_V2;
1309 break;
1310 case 3:
1311 sdma->script_number = SDMA_SCRIPT_ADDRS_ARRAY_SIZE_V3;
1312 break;
1313 default:
1314 dev_err(sdma->dev, "unknown firmware version\n");
1315 goto err_firmware;
1316 }
1317
1318 addr = (void *)header + header->script_addrs_start;
1319 ram_code = (void *)header + header->ram_code_start;
1320
1321 clk_enable(sdma->clk_ipg);
1322 clk_enable(sdma->clk_ahb);
1323 /* download the RAM image for SDMA */
1324 sdma_load_script(sdma, ram_code,
1325 header->ram_code_size,
1326 addr->ram_code_start_addr);
1327 clk_disable(sdma->clk_ipg);
1328 clk_disable(sdma->clk_ahb);
1329
1330 sdma_add_scripts(sdma, addr);
1331
1332 dev_info(sdma->dev, "loaded firmware %d.%d\n",
1333 header->version_major,
1334 header->version_minor);
1335
1336 err_firmware:
1337 release_firmware(fw);
1338 }
1339
1340 static int sdma_get_firmware(struct sdma_engine *sdma,
1341 const char *fw_name)
1342 {
1343 int ret;
1344
1345 ret = request_firmware_nowait(THIS_MODULE,
1346 FW_ACTION_HOTPLUG, fw_name, sdma->dev,
1347 GFP_KERNEL, sdma, sdma_load_firmware);
1348
1349 return ret;
1350 }
1351
1352 static int sdma_init(struct sdma_engine *sdma)
1353 {
1354 int i, ret;
1355 dma_addr_t ccb_phys;
1356
1357 clk_enable(sdma->clk_ipg);
1358 clk_enable(sdma->clk_ahb);
1359
1360 /* Be sure SDMA has not started yet */
1361 writel_relaxed(0, sdma->regs + SDMA_H_C0PTR);
1362
1363 sdma->channel_control = dma_alloc_coherent(NULL,
1364 MAX_DMA_CHANNELS * sizeof (struct sdma_channel_control) +
1365 sizeof(struct sdma_context_data),
1366 &ccb_phys, GFP_KERNEL);
1367
1368 if (!sdma->channel_control) {
1369 ret = -ENOMEM;
1370 goto err_dma_alloc;
1371 }
1372
1373 sdma->context = (void *)sdma->channel_control +
1374 MAX_DMA_CHANNELS * sizeof (struct sdma_channel_control);
1375 sdma->context_phys = ccb_phys +
1376 MAX_DMA_CHANNELS * sizeof (struct sdma_channel_control);
1377
1378 /* Zero-out the CCB structures array just allocated */
1379 memset(sdma->channel_control, 0,
1380 MAX_DMA_CHANNELS * sizeof (struct sdma_channel_control));
1381
1382 /* disable all channels */
1383 for (i = 0; i < sdma->drvdata->num_events; i++)
1384 writel_relaxed(0, sdma->regs + chnenbl_ofs(sdma, i));
1385
1386 /* All channels have priority 0 */
1387 for (i = 0; i < MAX_DMA_CHANNELS; i++)
1388 writel_relaxed(0, sdma->regs + SDMA_CHNPRI_0 + i * 4);
1389
1390 ret = sdma_request_channel(&sdma->channel[0]);
1391 if (ret)
1392 goto err_dma_alloc;
1393
1394 sdma_config_ownership(&sdma->channel[0], false, true, false);
1395
1396 /* Set Command Channel (Channel Zero) */
1397 writel_relaxed(0x4050, sdma->regs + SDMA_CHN0ADDR);
1398
1399 /* Set bits of CONFIG register but with static context switching */
1400 /* FIXME: Check whether to set ACR bit depending on clock ratios */
1401 writel_relaxed(0, sdma->regs + SDMA_H_CONFIG);
1402
1403 writel_relaxed(ccb_phys, sdma->regs + SDMA_H_C0PTR);
1404
1405 /* Initializes channel's priorities */
1406 sdma_set_channel_priority(&sdma->channel[0], 7);
1407
1408 clk_disable(sdma->clk_ipg);
1409 clk_disable(sdma->clk_ahb);
1410
1411 return 0;
1412
1413 err_dma_alloc:
1414 clk_disable(sdma->clk_ipg);
1415 clk_disable(sdma->clk_ahb);
1416 dev_err(sdma->dev, "initialisation failed with %d\n", ret);
1417 return ret;
1418 }
1419
1420 static bool sdma_filter_fn(struct dma_chan *chan, void *fn_param)
1421 {
1422 struct sdma_channel *sdmac = to_sdma_chan(chan);
1423 struct imx_dma_data *data = fn_param;
1424
1425 if (!imx_dma_is_general_purpose(chan))
1426 return false;
1427
1428 sdmac->data = *data;
1429 chan->private = &sdmac->data;
1430
1431 return true;
1432 }
1433
1434 static struct dma_chan *sdma_xlate(struct of_phandle_args *dma_spec,
1435 struct of_dma *ofdma)
1436 {
1437 struct sdma_engine *sdma = ofdma->of_dma_data;
1438 dma_cap_mask_t mask = sdma->dma_device.cap_mask;
1439 struct imx_dma_data data;
1440
1441 if (dma_spec->args_count != 3)
1442 return NULL;
1443
1444 data.dma_request = dma_spec->args[0];
1445 data.peripheral_type = dma_spec->args[1];
1446 data.priority = dma_spec->args[2];
1447
1448 return dma_request_channel(mask, sdma_filter_fn, &data);
1449 }
1450
1451 static int sdma_probe(struct platform_device *pdev)
1452 {
1453 const struct of_device_id *of_id =
1454 of_match_device(sdma_dt_ids, &pdev->dev);
1455 struct device_node *np = pdev->dev.of_node;
1456 const char *fw_name;
1457 int ret;
1458 int irq;
1459 struct resource *iores;
1460 struct sdma_platform_data *pdata = dev_get_platdata(&pdev->dev);
1461 int i;
1462 struct sdma_engine *sdma;
1463 s32 *saddr_arr;
1464 const struct sdma_driver_data *drvdata = NULL;
1465
1466 if (of_id)
1467 drvdata = of_id->data;
1468 else if (pdev->id_entry)
1469 drvdata = (void *)pdev->id_entry->driver_data;
1470
1471 if (!drvdata) {
1472 dev_err(&pdev->dev, "unable to find driver data\n");
1473 return -EINVAL;
1474 }
1475
1476 ret = dma_coerce_mask_and_coherent(&pdev->dev, DMA_BIT_MASK(32));
1477 if (ret)
1478 return ret;
1479
1480 sdma = devm_kzalloc(&pdev->dev, sizeof(*sdma), GFP_KERNEL);
1481 if (!sdma)
1482 return -ENOMEM;
1483
1484 spin_lock_init(&sdma->channel_0_lock);
1485
1486 sdma->dev = &pdev->dev;
1487 sdma->drvdata = drvdata;
1488
1489 irq = platform_get_irq(pdev, 0);
1490 if (irq < 0)
1491 return irq;
1492
1493 iores = platform_get_resource(pdev, IORESOURCE_MEM, 0);
1494 sdma->regs = devm_ioremap_resource(&pdev->dev, iores);
1495 if (IS_ERR(sdma->regs))
1496 return PTR_ERR(sdma->regs);
1497
1498 sdma->clk_ipg = devm_clk_get(&pdev->dev, "ipg");
1499 if (IS_ERR(sdma->clk_ipg))
1500 return PTR_ERR(sdma->clk_ipg);
1501
1502 sdma->clk_ahb = devm_clk_get(&pdev->dev, "ahb");
1503 if (IS_ERR(sdma->clk_ahb))
1504 return PTR_ERR(sdma->clk_ahb);
1505
1506 clk_prepare(sdma->clk_ipg);
1507 clk_prepare(sdma->clk_ahb);
1508
1509 ret = devm_request_irq(&pdev->dev, irq, sdma_int_handler, 0, "sdma",
1510 sdma);
1511 if (ret)
1512 return ret;
1513
1514 sdma->script_addrs = kzalloc(sizeof(*sdma->script_addrs), GFP_KERNEL);
1515 if (!sdma->script_addrs)
1516 return -ENOMEM;
1517
1518 /* initially no scripts available */
1519 saddr_arr = (s32 *)sdma->script_addrs;
1520 for (i = 0; i < SDMA_SCRIPT_ADDRS_ARRAY_SIZE_V1; i++)
1521 saddr_arr[i] = -EINVAL;
1522
1523 dma_cap_set(DMA_SLAVE, sdma->dma_device.cap_mask);
1524 dma_cap_set(DMA_CYCLIC, sdma->dma_device.cap_mask);
1525
1526 INIT_LIST_HEAD(&sdma->dma_device.channels);
1527 /* Initialize channel parameters */
1528 for (i = 0; i < MAX_DMA_CHANNELS; i++) {
1529 struct sdma_channel *sdmac = &sdma->channel[i];
1530
1531 sdmac->sdma = sdma;
1532 spin_lock_init(&sdmac->lock);
1533
1534 sdmac->chan.device = &sdma->dma_device;
1535 dma_cookie_init(&sdmac->chan);
1536 sdmac->channel = i;
1537
1538 tasklet_init(&sdmac->tasklet, sdma_tasklet,
1539 (unsigned long) sdmac);
1540 /*
1541 * Add the channel to the DMAC list. Do not add channel 0 though
1542 * because we need it internally in the SDMA driver. This also means
1543 * that channel 0 in dmaengine counting matches sdma channel 1.
1544 */
1545 if (i)
1546 list_add_tail(&sdmac->chan.device_node,
1547 &sdma->dma_device.channels);
1548 }
1549
1550 ret = sdma_init(sdma);
1551 if (ret)
1552 goto err_init;
1553
1554 if (sdma->drvdata->script_addrs)
1555 sdma_add_scripts(sdma, sdma->drvdata->script_addrs);
1556 if (pdata && pdata->script_addrs)
1557 sdma_add_scripts(sdma, pdata->script_addrs);
1558
1559 if (pdata) {
1560 ret = sdma_get_firmware(sdma, pdata->fw_name);
1561 if (ret)
1562 dev_warn(&pdev->dev, "failed to get firmware from platform data\n");
1563 } else {
1564 /*
1565 * Because that device tree does not encode ROM script address,
1566 * the RAM script in firmware is mandatory for device tree
1567 * probe, otherwise it fails.
1568 */
1569 ret = of_property_read_string(np, "fsl,sdma-ram-script-name",
1570 &fw_name);
1571 if (ret)
1572 dev_warn(&pdev->dev, "failed to get firmware name\n");
1573 else {
1574 ret = sdma_get_firmware(sdma, fw_name);
1575 if (ret)
1576 dev_warn(&pdev->dev, "failed to get firmware from device tree\n");
1577 }
1578 }
1579
1580 sdma->dma_device.dev = &pdev->dev;
1581
1582 sdma->dma_device.device_alloc_chan_resources = sdma_alloc_chan_resources;
1583 sdma->dma_device.device_free_chan_resources = sdma_free_chan_resources;
1584 sdma->dma_device.device_tx_status = sdma_tx_status;
1585 sdma->dma_device.device_prep_slave_sg = sdma_prep_slave_sg;
1586 sdma->dma_device.device_prep_dma_cyclic = sdma_prep_dma_cyclic;
1587 sdma->dma_device.device_config = sdma_config;
1588 sdma->dma_device.device_terminate_all = sdma_disable_channel;
1589 sdma->dma_device.src_addr_widths = BIT(DMA_SLAVE_BUSWIDTH_4_BYTES);
1590 sdma->dma_device.dst_addr_widths = BIT(DMA_SLAVE_BUSWIDTH_4_BYTES);
1591 sdma->dma_device.directions = BIT(DMA_DEV_TO_MEM) | BIT(DMA_MEM_TO_DEV);
1592 sdma->dma_device.residue_granularity = DMA_RESIDUE_GRANULARITY_BURST;
1593 sdma->dma_device.device_issue_pending = sdma_issue_pending;
1594 sdma->dma_device.dev->dma_parms = &sdma->dma_parms;
1595 dma_set_max_seg_size(sdma->dma_device.dev, 65535);
1596
1597 platform_set_drvdata(pdev, sdma);
1598
1599 ret = dma_async_device_register(&sdma->dma_device);
1600 if (ret) {
1601 dev_err(&pdev->dev, "unable to register\n");
1602 goto err_init;
1603 }
1604
1605 if (np) {
1606 ret = of_dma_controller_register(np, sdma_xlate, sdma);
1607 if (ret) {
1608 dev_err(&pdev->dev, "failed to register controller\n");
1609 goto err_register;
1610 }
1611 }
1612
1613 dev_info(sdma->dev, "initialized\n");
1614
1615 return 0;
1616
1617 err_register:
1618 dma_async_device_unregister(&sdma->dma_device);
1619 err_init:
1620 kfree(sdma->script_addrs);
1621 return ret;
1622 }
1623
1624 static int sdma_remove(struct platform_device *pdev)
1625 {
1626 struct sdma_engine *sdma = platform_get_drvdata(pdev);
1627 int i;
1628
1629 dma_async_device_unregister(&sdma->dma_device);
1630 kfree(sdma->script_addrs);
1631 /* Kill the tasklet */
1632 for (i = 0; i < MAX_DMA_CHANNELS; i++) {
1633 struct sdma_channel *sdmac = &sdma->channel[i];
1634
1635 tasklet_kill(&sdmac->tasklet);
1636 }
1637
1638 platform_set_drvdata(pdev, NULL);
1639 dev_info(&pdev->dev, "Removed...\n");
1640 return 0;
1641 }
1642
1643 static struct platform_driver sdma_driver = {
1644 .driver = {
1645 .name = "imx-sdma",
1646 .of_match_table = sdma_dt_ids,
1647 },
1648 .id_table = sdma_devtypes,
1649 .remove = sdma_remove,
1650 .probe = sdma_probe,
1651 };
1652
1653 module_platform_driver(sdma_driver);
1654
1655 MODULE_AUTHOR("Sascha Hauer, Pengutronix <s.hauer@pengutronix.de>");
1656 MODULE_DESCRIPTION("i.MX SDMA driver");
1657 MODULE_LICENSE("GPL");
Linux with added FPC-III support