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1ec1e82f SH |
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/types.h> | |
22 | #include <linux/mm.h> | |
23 | #include <linux/interrupt.h> | |
24 | #include <linux/clk.h> | |
25 | #include <linux/wait.h> | |
26 | #include <linux/sched.h> | |
27 | #include <linux/semaphore.h> | |
28 | #include <linux/spinlock.h> | |
29 | #include <linux/device.h> | |
30 | #include <linux/dma-mapping.h> | |
31 | #include <linux/firmware.h> | |
32 | #include <linux/slab.h> | |
33 | #include <linux/platform_device.h> | |
34 | #include <linux/dmaengine.h> | |
580975d7 SG |
35 | #include <linux/of.h> |
36 | #include <linux/of_device.h> | |
1ec1e82f SH |
37 | |
38 | #include <asm/irq.h> | |
39 | #include <mach/sdma.h> | |
40 | #include <mach/dma.h> | |
41 | #include <mach/hardware.h> | |
42 | ||
43 | /* SDMA registers */ | |
44 | #define SDMA_H_C0PTR 0x000 | |
45 | #define SDMA_H_INTR 0x004 | |
46 | #define SDMA_H_STATSTOP 0x008 | |
47 | #define SDMA_H_START 0x00c | |
48 | #define SDMA_H_EVTOVR 0x010 | |
49 | #define SDMA_H_DSPOVR 0x014 | |
50 | #define SDMA_H_HOSTOVR 0x018 | |
51 | #define SDMA_H_EVTPEND 0x01c | |
52 | #define SDMA_H_DSPENBL 0x020 | |
53 | #define SDMA_H_RESET 0x024 | |
54 | #define SDMA_H_EVTERR 0x028 | |
55 | #define SDMA_H_INTRMSK 0x02c | |
56 | #define SDMA_H_PSW 0x030 | |
57 | #define SDMA_H_EVTERRDBG 0x034 | |
58 | #define SDMA_H_CONFIG 0x038 | |
59 | #define SDMA_ONCE_ENB 0x040 | |
60 | #define SDMA_ONCE_DATA 0x044 | |
61 | #define SDMA_ONCE_INSTR 0x048 | |
62 | #define SDMA_ONCE_STAT 0x04c | |
63 | #define SDMA_ONCE_CMD 0x050 | |
64 | #define SDMA_EVT_MIRROR 0x054 | |
65 | #define SDMA_ILLINSTADDR 0x058 | |
66 | #define SDMA_CHN0ADDR 0x05c | |
67 | #define SDMA_ONCE_RTB 0x060 | |
68 | #define SDMA_XTRIG_CONF1 0x070 | |
69 | #define SDMA_XTRIG_CONF2 0x074 | |
62550cd7 SG |
70 | #define SDMA_CHNENBL0_IMX35 0x200 |
71 | #define SDMA_CHNENBL0_IMX31 0x080 | |
1ec1e82f SH |
72 | #define SDMA_CHNPRI_0 0x100 |
73 | ||
74 | /* | |
75 | * Buffer descriptor status values. | |
76 | */ | |
77 | #define BD_DONE 0x01 | |
78 | #define BD_WRAP 0x02 | |
79 | #define BD_CONT 0x04 | |
80 | #define BD_INTR 0x08 | |
81 | #define BD_RROR 0x10 | |
82 | #define BD_LAST 0x20 | |
83 | #define BD_EXTD 0x80 | |
84 | ||
85 | /* | |
86 | * Data Node descriptor status values. | |
87 | */ | |
88 | #define DND_END_OF_FRAME 0x80 | |
89 | #define DND_END_OF_XFER 0x40 | |
90 | #define DND_DONE 0x20 | |
91 | #define DND_UNUSED 0x01 | |
92 | ||
93 | /* | |
94 | * IPCV2 descriptor status values. | |
95 | */ | |
96 | #define BD_IPCV2_END_OF_FRAME 0x40 | |
97 | ||
98 | #define IPCV2_MAX_NODES 50 | |
99 | /* | |
100 | * Error bit set in the CCB status field by the SDMA, | |
101 | * in setbd routine, in case of a transfer error | |
102 | */ | |
103 | #define DATA_ERROR 0x10000000 | |
104 | ||
105 | /* | |
106 | * Buffer descriptor commands. | |
107 | */ | |
108 | #define C0_ADDR 0x01 | |
109 | #define C0_LOAD 0x02 | |
110 | #define C0_DUMP 0x03 | |
111 | #define C0_SETCTX 0x07 | |
112 | #define C0_GETCTX 0x03 | |
113 | #define C0_SETDM 0x01 | |
114 | #define C0_SETPM 0x04 | |
115 | #define C0_GETDM 0x02 | |
116 | #define C0_GETPM 0x08 | |
117 | /* | |
118 | * Change endianness indicator in the BD command field | |
119 | */ | |
120 | #define CHANGE_ENDIANNESS 0x80 | |
121 | ||
122 | /* | |
123 | * Mode/Count of data node descriptors - IPCv2 | |
124 | */ | |
125 | struct sdma_mode_count { | |
126 | u32 count : 16; /* size of the buffer pointed by this BD */ | |
127 | u32 status : 8; /* E,R,I,C,W,D status bits stored here */ | |
128 | u32 command : 8; /* command mostlky used for channel 0 */ | |
129 | }; | |
130 | ||
131 | /* | |
132 | * Buffer descriptor | |
133 | */ | |
134 | struct sdma_buffer_descriptor { | |
135 | struct sdma_mode_count mode; | |
136 | u32 buffer_addr; /* address of the buffer described */ | |
137 | u32 ext_buffer_addr; /* extended buffer address */ | |
138 | } __attribute__ ((packed)); | |
139 | ||
140 | /** | |
141 | * struct sdma_channel_control - Channel control Block | |
142 | * | |
143 | * @current_bd_ptr current buffer descriptor processed | |
144 | * @base_bd_ptr first element of buffer descriptor array | |
145 | * @unused padding. The SDMA engine expects an array of 128 byte | |
146 | * control blocks | |
147 | */ | |
148 | struct sdma_channel_control { | |
149 | u32 current_bd_ptr; | |
150 | u32 base_bd_ptr; | |
151 | u32 unused[2]; | |
152 | } __attribute__ ((packed)); | |
153 | ||
154 | /** | |
155 | * struct sdma_state_registers - SDMA context for a channel | |
156 | * | |
157 | * @pc: program counter | |
158 | * @t: test bit: status of arithmetic & test instruction | |
159 | * @rpc: return program counter | |
160 | * @sf: source fault while loading data | |
161 | * @spc: loop start program counter | |
162 | * @df: destination fault while storing data | |
163 | * @epc: loop end program counter | |
164 | * @lm: loop mode | |
165 | */ | |
166 | struct sdma_state_registers { | |
167 | u32 pc :14; | |
168 | u32 unused1: 1; | |
169 | u32 t : 1; | |
170 | u32 rpc :14; | |
171 | u32 unused0: 1; | |
172 | u32 sf : 1; | |
173 | u32 spc :14; | |
174 | u32 unused2: 1; | |
175 | u32 df : 1; | |
176 | u32 epc :14; | |
177 | u32 lm : 2; | |
178 | } __attribute__ ((packed)); | |
179 | ||
180 | /** | |
181 | * struct sdma_context_data - sdma context specific to a channel | |
182 | * | |
183 | * @channel_state: channel state bits | |
184 | * @gReg: general registers | |
185 | * @mda: burst dma destination address register | |
186 | * @msa: burst dma source address register | |
187 | * @ms: burst dma status register | |
188 | * @md: burst dma data register | |
189 | * @pda: peripheral dma destination address register | |
190 | * @psa: peripheral dma source address register | |
191 | * @ps: peripheral dma status register | |
192 | * @pd: peripheral dma data register | |
193 | * @ca: CRC polynomial register | |
194 | * @cs: CRC accumulator register | |
195 | * @dda: dedicated core destination address register | |
196 | * @dsa: dedicated core source address register | |
197 | * @ds: dedicated core status register | |
198 | * @dd: dedicated core data register | |
199 | */ | |
200 | struct sdma_context_data { | |
201 | struct sdma_state_registers channel_state; | |
202 | u32 gReg[8]; | |
203 | u32 mda; | |
204 | u32 msa; | |
205 | u32 ms; | |
206 | u32 md; | |
207 | u32 pda; | |
208 | u32 psa; | |
209 | u32 ps; | |
210 | u32 pd; | |
211 | u32 ca; | |
212 | u32 cs; | |
213 | u32 dda; | |
214 | u32 dsa; | |
215 | u32 ds; | |
216 | u32 dd; | |
217 | u32 scratch0; | |
218 | u32 scratch1; | |
219 | u32 scratch2; | |
220 | u32 scratch3; | |
221 | u32 scratch4; | |
222 | u32 scratch5; | |
223 | u32 scratch6; | |
224 | u32 scratch7; | |
225 | } __attribute__ ((packed)); | |
226 | ||
227 | #define NUM_BD (int)(PAGE_SIZE / sizeof(struct sdma_buffer_descriptor)) | |
228 | ||
229 | struct sdma_engine; | |
230 | ||
231 | /** | |
232 | * struct sdma_channel - housekeeping for a SDMA channel | |
233 | * | |
234 | * @sdma pointer to the SDMA engine for this channel | |
23889c63 | 235 | * @channel the channel number, matches dmaengine chan_id + 1 |
1ec1e82f SH |
236 | * @direction transfer type. Needed for setting SDMA script |
237 | * @peripheral_type Peripheral type. Needed for setting SDMA script | |
238 | * @event_id0 aka dma request line | |
239 | * @event_id1 for channels that use 2 events | |
240 | * @word_size peripheral access size | |
241 | * @buf_tail ID of the buffer that was processed | |
242 | * @done channel completion | |
243 | * @num_bd max NUM_BD. number of descriptors currently handling | |
244 | */ | |
245 | struct sdma_channel { | |
246 | struct sdma_engine *sdma; | |
247 | unsigned int channel; | |
248 | enum dma_data_direction direction; | |
249 | enum sdma_peripheral_type peripheral_type; | |
250 | unsigned int event_id0; | |
251 | unsigned int event_id1; | |
252 | enum dma_slave_buswidth word_size; | |
253 | unsigned int buf_tail; | |
254 | struct completion done; | |
255 | unsigned int num_bd; | |
256 | struct sdma_buffer_descriptor *bd; | |
257 | dma_addr_t bd_phys; | |
258 | unsigned int pc_from_device, pc_to_device; | |
259 | unsigned long flags; | |
260 | dma_addr_t per_address; | |
261 | u32 event_mask0, event_mask1; | |
262 | u32 watermark_level; | |
263 | u32 shp_addr, per_addr; | |
264 | struct dma_chan chan; | |
265 | spinlock_t lock; | |
266 | struct dma_async_tx_descriptor desc; | |
267 | dma_cookie_t last_completed; | |
268 | enum dma_status status; | |
269 | }; | |
270 | ||
271 | #define IMX_DMA_SG_LOOP (1 << 0) | |
272 | ||
273 | #define MAX_DMA_CHANNELS 32 | |
274 | #define MXC_SDMA_DEFAULT_PRIORITY 1 | |
275 | #define MXC_SDMA_MIN_PRIORITY 1 | |
276 | #define MXC_SDMA_MAX_PRIORITY 7 | |
277 | ||
1ec1e82f SH |
278 | #define SDMA_FIRMWARE_MAGIC 0x414d4453 |
279 | ||
280 | /** | |
281 | * struct sdma_firmware_header - Layout of the firmware image | |
282 | * | |
283 | * @magic "SDMA" | |
284 | * @version_major increased whenever layout of struct sdma_script_start_addrs | |
285 | * changes. | |
286 | * @version_minor firmware minor version (for binary compatible changes) | |
287 | * @script_addrs_start offset of struct sdma_script_start_addrs in this image | |
288 | * @num_script_addrs Number of script addresses in this image | |
289 | * @ram_code_start offset of SDMA ram image in this firmware image | |
290 | * @ram_code_size size of SDMA ram image | |
291 | * @script_addrs Stores the start address of the SDMA scripts | |
292 | * (in SDMA memory space) | |
293 | */ | |
294 | struct sdma_firmware_header { | |
295 | u32 magic; | |
296 | u32 version_major; | |
297 | u32 version_minor; | |
298 | u32 script_addrs_start; | |
299 | u32 num_script_addrs; | |
300 | u32 ram_code_start; | |
301 | u32 ram_code_size; | |
302 | }; | |
303 | ||
62550cd7 SG |
304 | enum sdma_devtype { |
305 | IMX31_SDMA, /* runs on i.mx31 */ | |
306 | IMX35_SDMA, /* runs on i.mx35 and later */ | |
307 | }; | |
308 | ||
1ec1e82f SH |
309 | struct sdma_engine { |
310 | struct device *dev; | |
b9b3f82f | 311 | struct device_dma_parameters dma_parms; |
1ec1e82f SH |
312 | struct sdma_channel channel[MAX_DMA_CHANNELS]; |
313 | struct sdma_channel_control *channel_control; | |
314 | void __iomem *regs; | |
62550cd7 | 315 | enum sdma_devtype devtype; |
1ec1e82f SH |
316 | unsigned int num_events; |
317 | struct sdma_context_data *context; | |
318 | dma_addr_t context_phys; | |
319 | struct dma_device dma_device; | |
320 | struct clk *clk; | |
321 | struct sdma_script_start_addrs *script_addrs; | |
322 | }; | |
323 | ||
62550cd7 SG |
324 | static struct platform_device_id sdma_devtypes[] = { |
325 | { | |
326 | .name = "imx31-sdma", | |
327 | .driver_data = IMX31_SDMA, | |
328 | }, { | |
329 | .name = "imx35-sdma", | |
330 | .driver_data = IMX35_SDMA, | |
331 | }, { | |
332 | /* sentinel */ | |
333 | } | |
334 | }; | |
335 | MODULE_DEVICE_TABLE(platform, sdma_devtypes); | |
336 | ||
580975d7 SG |
337 | static const struct of_device_id sdma_dt_ids[] = { |
338 | { .compatible = "fsl,imx31-sdma", .data = &sdma_devtypes[IMX31_SDMA], }, | |
339 | { .compatible = "fsl,imx35-sdma", .data = &sdma_devtypes[IMX35_SDMA], }, | |
340 | { /* sentinel */ } | |
341 | }; | |
342 | MODULE_DEVICE_TABLE(of, sdma_dt_ids); | |
343 | ||
1ec1e82f SH |
344 | #define SDMA_H_CONFIG_DSPDMA (1 << 12) /* indicates if the DSPDMA is used */ |
345 | #define SDMA_H_CONFIG_RTD_PINS (1 << 11) /* indicates if Real-Time Debug pins are enabled */ | |
346 | #define SDMA_H_CONFIG_ACR (1 << 4) /* indicates if AHB freq /core freq = 2 or 1 */ | |
347 | #define SDMA_H_CONFIG_CSM (3) /* indicates which context switch mode is selected*/ | |
348 | ||
349 | static inline u32 chnenbl_ofs(struct sdma_engine *sdma, unsigned int event) | |
350 | { | |
62550cd7 SG |
351 | u32 chnenbl0 = (sdma->devtype == IMX31_SDMA ? SDMA_CHNENBL0_IMX31 : |
352 | SDMA_CHNENBL0_IMX35); | |
1ec1e82f SH |
353 | return chnenbl0 + event * 4; |
354 | } | |
355 | ||
356 | static int sdma_config_ownership(struct sdma_channel *sdmac, | |
357 | bool event_override, bool mcu_override, bool dsp_override) | |
358 | { | |
359 | struct sdma_engine *sdma = sdmac->sdma; | |
360 | int channel = sdmac->channel; | |
361 | u32 evt, mcu, dsp; | |
362 | ||
363 | if (event_override && mcu_override && dsp_override) | |
364 | return -EINVAL; | |
365 | ||
366 | evt = __raw_readl(sdma->regs + SDMA_H_EVTOVR); | |
367 | mcu = __raw_readl(sdma->regs + SDMA_H_HOSTOVR); | |
368 | dsp = __raw_readl(sdma->regs + SDMA_H_DSPOVR); | |
369 | ||
370 | if (dsp_override) | |
371 | dsp &= ~(1 << channel); | |
372 | else | |
373 | dsp |= (1 << channel); | |
374 | ||
375 | if (event_override) | |
376 | evt &= ~(1 << channel); | |
377 | else | |
378 | evt |= (1 << channel); | |
379 | ||
380 | if (mcu_override) | |
381 | mcu &= ~(1 << channel); | |
382 | else | |
383 | mcu |= (1 << channel); | |
384 | ||
385 | __raw_writel(evt, sdma->regs + SDMA_H_EVTOVR); | |
386 | __raw_writel(mcu, sdma->regs + SDMA_H_HOSTOVR); | |
387 | __raw_writel(dsp, sdma->regs + SDMA_H_DSPOVR); | |
388 | ||
389 | return 0; | |
390 | } | |
391 | ||
392 | /* | |
393 | * sdma_run_channel - run a channel and wait till it's done | |
394 | */ | |
395 | static int sdma_run_channel(struct sdma_channel *sdmac) | |
396 | { | |
397 | struct sdma_engine *sdma = sdmac->sdma; | |
398 | int channel = sdmac->channel; | |
399 | int ret; | |
400 | ||
401 | init_completion(&sdmac->done); | |
402 | ||
403 | __raw_writel(1 << channel, sdma->regs + SDMA_H_START); | |
404 | ||
405 | ret = wait_for_completion_timeout(&sdmac->done, HZ); | |
406 | ||
407 | return ret ? 0 : -ETIMEDOUT; | |
408 | } | |
409 | ||
410 | static int sdma_load_script(struct sdma_engine *sdma, void *buf, int size, | |
411 | u32 address) | |
412 | { | |
413 | struct sdma_buffer_descriptor *bd0 = sdma->channel[0].bd; | |
414 | void *buf_virt; | |
415 | dma_addr_t buf_phys; | |
416 | int ret; | |
417 | ||
418 | buf_virt = dma_alloc_coherent(NULL, | |
419 | size, | |
420 | &buf_phys, GFP_KERNEL); | |
421 | if (!buf_virt) | |
422 | return -ENOMEM; | |
423 | ||
424 | bd0->mode.command = C0_SETPM; | |
425 | bd0->mode.status = BD_DONE | BD_INTR | BD_WRAP | BD_EXTD; | |
426 | bd0->mode.count = size / 2; | |
427 | bd0->buffer_addr = buf_phys; | |
428 | bd0->ext_buffer_addr = address; | |
429 | ||
430 | memcpy(buf_virt, buf, size); | |
431 | ||
432 | ret = sdma_run_channel(&sdma->channel[0]); | |
433 | ||
434 | dma_free_coherent(NULL, size, buf_virt, buf_phys); | |
435 | ||
436 | return ret; | |
437 | } | |
438 | ||
439 | static void sdma_event_enable(struct sdma_channel *sdmac, unsigned int event) | |
440 | { | |
441 | struct sdma_engine *sdma = sdmac->sdma; | |
442 | int channel = sdmac->channel; | |
443 | u32 val; | |
444 | u32 chnenbl = chnenbl_ofs(sdma, event); | |
445 | ||
446 | val = __raw_readl(sdma->regs + chnenbl); | |
447 | val |= (1 << channel); | |
448 | __raw_writel(val, sdma->regs + chnenbl); | |
449 | } | |
450 | ||
451 | static void sdma_event_disable(struct sdma_channel *sdmac, unsigned int event) | |
452 | { | |
453 | struct sdma_engine *sdma = sdmac->sdma; | |
454 | int channel = sdmac->channel; | |
455 | u32 chnenbl = chnenbl_ofs(sdma, event); | |
456 | u32 val; | |
457 | ||
458 | val = __raw_readl(sdma->regs + chnenbl); | |
459 | val &= ~(1 << channel); | |
460 | __raw_writel(val, sdma->regs + chnenbl); | |
461 | } | |
462 | ||
463 | static void sdma_handle_channel_loop(struct sdma_channel *sdmac) | |
464 | { | |
465 | struct sdma_buffer_descriptor *bd; | |
466 | ||
467 | /* | |
468 | * loop mode. Iterate over descriptors, re-setup them and | |
469 | * call callback function. | |
470 | */ | |
471 | while (1) { | |
472 | bd = &sdmac->bd[sdmac->buf_tail]; | |
473 | ||
474 | if (bd->mode.status & BD_DONE) | |
475 | break; | |
476 | ||
477 | if (bd->mode.status & BD_RROR) | |
478 | sdmac->status = DMA_ERROR; | |
479 | else | |
1e9cebb4 | 480 | sdmac->status = DMA_IN_PROGRESS; |
1ec1e82f SH |
481 | |
482 | bd->mode.status |= BD_DONE; | |
483 | sdmac->buf_tail++; | |
484 | sdmac->buf_tail %= sdmac->num_bd; | |
485 | ||
486 | if (sdmac->desc.callback) | |
487 | sdmac->desc.callback(sdmac->desc.callback_param); | |
488 | } | |
489 | } | |
490 | ||
491 | static void mxc_sdma_handle_channel_normal(struct sdma_channel *sdmac) | |
492 | { | |
493 | struct sdma_buffer_descriptor *bd; | |
494 | int i, error = 0; | |
495 | ||
496 | /* | |
497 | * non loop mode. Iterate over all descriptors, collect | |
498 | * errors and call callback function | |
499 | */ | |
500 | for (i = 0; i < sdmac->num_bd; i++) { | |
501 | bd = &sdmac->bd[i]; | |
502 | ||
503 | if (bd->mode.status & (BD_DONE | BD_RROR)) | |
504 | error = -EIO; | |
505 | } | |
506 | ||
507 | if (error) | |
508 | sdmac->status = DMA_ERROR; | |
509 | else | |
510 | sdmac->status = DMA_SUCCESS; | |
511 | ||
512 | if (sdmac->desc.callback) | |
513 | sdmac->desc.callback(sdmac->desc.callback_param); | |
514 | sdmac->last_completed = sdmac->desc.cookie; | |
515 | } | |
516 | ||
517 | static void mxc_sdma_handle_channel(struct sdma_channel *sdmac) | |
518 | { | |
519 | complete(&sdmac->done); | |
520 | ||
521 | /* not interested in channel 0 interrupts */ | |
522 | if (sdmac->channel == 0) | |
523 | return; | |
524 | ||
525 | if (sdmac->flags & IMX_DMA_SG_LOOP) | |
526 | sdma_handle_channel_loop(sdmac); | |
527 | else | |
528 | mxc_sdma_handle_channel_normal(sdmac); | |
529 | } | |
530 | ||
531 | static irqreturn_t sdma_int_handler(int irq, void *dev_id) | |
532 | { | |
533 | struct sdma_engine *sdma = dev_id; | |
534 | u32 stat; | |
535 | ||
536 | stat = __raw_readl(sdma->regs + SDMA_H_INTR); | |
537 | __raw_writel(stat, sdma->regs + SDMA_H_INTR); | |
538 | ||
539 | while (stat) { | |
540 | int channel = fls(stat) - 1; | |
541 | struct sdma_channel *sdmac = &sdma->channel[channel]; | |
542 | ||
543 | mxc_sdma_handle_channel(sdmac); | |
544 | ||
545 | stat &= ~(1 << channel); | |
546 | } | |
547 | ||
548 | return IRQ_HANDLED; | |
549 | } | |
550 | ||
551 | /* | |
552 | * sets the pc of SDMA script according to the peripheral type | |
553 | */ | |
554 | static void sdma_get_pc(struct sdma_channel *sdmac, | |
555 | enum sdma_peripheral_type peripheral_type) | |
556 | { | |
557 | struct sdma_engine *sdma = sdmac->sdma; | |
558 | int per_2_emi = 0, emi_2_per = 0; | |
559 | /* | |
560 | * These are needed once we start to support transfers between | |
561 | * two peripherals or memory-to-memory transfers | |
562 | */ | |
563 | int per_2_per = 0, emi_2_emi = 0; | |
564 | ||
565 | sdmac->pc_from_device = 0; | |
566 | sdmac->pc_to_device = 0; | |
567 | ||
568 | switch (peripheral_type) { | |
569 | case IMX_DMATYPE_MEMORY: | |
570 | emi_2_emi = sdma->script_addrs->ap_2_ap_addr; | |
571 | break; | |
572 | case IMX_DMATYPE_DSP: | |
573 | emi_2_per = sdma->script_addrs->bp_2_ap_addr; | |
574 | per_2_emi = sdma->script_addrs->ap_2_bp_addr; | |
575 | break; | |
576 | case IMX_DMATYPE_FIRI: | |
577 | per_2_emi = sdma->script_addrs->firi_2_mcu_addr; | |
578 | emi_2_per = sdma->script_addrs->mcu_2_firi_addr; | |
579 | break; | |
580 | case IMX_DMATYPE_UART: | |
581 | per_2_emi = sdma->script_addrs->uart_2_mcu_addr; | |
582 | emi_2_per = sdma->script_addrs->mcu_2_app_addr; | |
583 | break; | |
584 | case IMX_DMATYPE_UART_SP: | |
585 | per_2_emi = sdma->script_addrs->uartsh_2_mcu_addr; | |
586 | emi_2_per = sdma->script_addrs->mcu_2_shp_addr; | |
587 | break; | |
588 | case IMX_DMATYPE_ATA: | |
589 | per_2_emi = sdma->script_addrs->ata_2_mcu_addr; | |
590 | emi_2_per = sdma->script_addrs->mcu_2_ata_addr; | |
591 | break; | |
592 | case IMX_DMATYPE_CSPI: | |
593 | case IMX_DMATYPE_EXT: | |
594 | case IMX_DMATYPE_SSI: | |
595 | per_2_emi = sdma->script_addrs->app_2_mcu_addr; | |
596 | emi_2_per = sdma->script_addrs->mcu_2_app_addr; | |
597 | break; | |
598 | case IMX_DMATYPE_SSI_SP: | |
599 | case IMX_DMATYPE_MMC: | |
600 | case IMX_DMATYPE_SDHC: | |
601 | case IMX_DMATYPE_CSPI_SP: | |
602 | case IMX_DMATYPE_ESAI: | |
603 | case IMX_DMATYPE_MSHC_SP: | |
604 | per_2_emi = sdma->script_addrs->shp_2_mcu_addr; | |
605 | emi_2_per = sdma->script_addrs->mcu_2_shp_addr; | |
606 | break; | |
607 | case IMX_DMATYPE_ASRC: | |
608 | per_2_emi = sdma->script_addrs->asrc_2_mcu_addr; | |
609 | emi_2_per = sdma->script_addrs->asrc_2_mcu_addr; | |
610 | per_2_per = sdma->script_addrs->per_2_per_addr; | |
611 | break; | |
612 | case IMX_DMATYPE_MSHC: | |
613 | per_2_emi = sdma->script_addrs->mshc_2_mcu_addr; | |
614 | emi_2_per = sdma->script_addrs->mcu_2_mshc_addr; | |
615 | break; | |
616 | case IMX_DMATYPE_CCM: | |
617 | per_2_emi = sdma->script_addrs->dptc_dvfs_addr; | |
618 | break; | |
619 | case IMX_DMATYPE_SPDIF: | |
620 | per_2_emi = sdma->script_addrs->spdif_2_mcu_addr; | |
621 | emi_2_per = sdma->script_addrs->mcu_2_spdif_addr; | |
622 | break; | |
623 | case IMX_DMATYPE_IPU_MEMORY: | |
624 | emi_2_per = sdma->script_addrs->ext_mem_2_ipu_addr; | |
625 | break; | |
626 | default: | |
627 | break; | |
628 | } | |
629 | ||
630 | sdmac->pc_from_device = per_2_emi; | |
631 | sdmac->pc_to_device = emi_2_per; | |
632 | } | |
633 | ||
634 | static int sdma_load_context(struct sdma_channel *sdmac) | |
635 | { | |
636 | struct sdma_engine *sdma = sdmac->sdma; | |
637 | int channel = sdmac->channel; | |
638 | int load_address; | |
639 | struct sdma_context_data *context = sdma->context; | |
640 | struct sdma_buffer_descriptor *bd0 = sdma->channel[0].bd; | |
641 | int ret; | |
642 | ||
643 | if (sdmac->direction == DMA_FROM_DEVICE) { | |
644 | load_address = sdmac->pc_from_device; | |
645 | } else { | |
646 | load_address = sdmac->pc_to_device; | |
647 | } | |
648 | ||
649 | if (load_address < 0) | |
650 | return load_address; | |
651 | ||
652 | dev_dbg(sdma->dev, "load_address = %d\n", load_address); | |
653 | dev_dbg(sdma->dev, "wml = 0x%08x\n", sdmac->watermark_level); | |
654 | dev_dbg(sdma->dev, "shp_addr = 0x%08x\n", sdmac->shp_addr); | |
655 | dev_dbg(sdma->dev, "per_addr = 0x%08x\n", sdmac->per_addr); | |
656 | dev_dbg(sdma->dev, "event_mask0 = 0x%08x\n", sdmac->event_mask0); | |
657 | dev_dbg(sdma->dev, "event_mask1 = 0x%08x\n", sdmac->event_mask1); | |
658 | ||
659 | memset(context, 0, sizeof(*context)); | |
660 | context->channel_state.pc = load_address; | |
661 | ||
662 | /* Send by context the event mask,base address for peripheral | |
663 | * and watermark level | |
664 | */ | |
665 | context->gReg[0] = sdmac->event_mask1; | |
666 | context->gReg[1] = sdmac->event_mask0; | |
667 | context->gReg[2] = sdmac->per_addr; | |
668 | context->gReg[6] = sdmac->shp_addr; | |
669 | context->gReg[7] = sdmac->watermark_level; | |
670 | ||
671 | bd0->mode.command = C0_SETDM; | |
672 | bd0->mode.status = BD_DONE | BD_INTR | BD_WRAP | BD_EXTD; | |
673 | bd0->mode.count = sizeof(*context) / 4; | |
674 | bd0->buffer_addr = sdma->context_phys; | |
675 | bd0->ext_buffer_addr = 2048 + (sizeof(*context) / 4) * channel; | |
676 | ||
677 | ret = sdma_run_channel(&sdma->channel[0]); | |
678 | ||
679 | return ret; | |
680 | } | |
681 | ||
682 | static void sdma_disable_channel(struct sdma_channel *sdmac) | |
683 | { | |
684 | struct sdma_engine *sdma = sdmac->sdma; | |
685 | int channel = sdmac->channel; | |
686 | ||
687 | __raw_writel(1 << channel, sdma->regs + SDMA_H_STATSTOP); | |
688 | sdmac->status = DMA_ERROR; | |
689 | } | |
690 | ||
691 | static int sdma_config_channel(struct sdma_channel *sdmac) | |
692 | { | |
693 | int ret; | |
694 | ||
695 | sdma_disable_channel(sdmac); | |
696 | ||
697 | sdmac->event_mask0 = 0; | |
698 | sdmac->event_mask1 = 0; | |
699 | sdmac->shp_addr = 0; | |
700 | sdmac->per_addr = 0; | |
701 | ||
702 | if (sdmac->event_id0) { | |
703 | if (sdmac->event_id0 > 32) | |
704 | return -EINVAL; | |
705 | sdma_event_enable(sdmac, sdmac->event_id0); | |
706 | } | |
707 | ||
708 | switch (sdmac->peripheral_type) { | |
709 | case IMX_DMATYPE_DSP: | |
710 | sdma_config_ownership(sdmac, false, true, true); | |
711 | break; | |
712 | case IMX_DMATYPE_MEMORY: | |
713 | sdma_config_ownership(sdmac, false, true, false); | |
714 | break; | |
715 | default: | |
716 | sdma_config_ownership(sdmac, true, true, false); | |
717 | break; | |
718 | } | |
719 | ||
720 | sdma_get_pc(sdmac, sdmac->peripheral_type); | |
721 | ||
722 | if ((sdmac->peripheral_type != IMX_DMATYPE_MEMORY) && | |
723 | (sdmac->peripheral_type != IMX_DMATYPE_DSP)) { | |
724 | /* Handle multiple event channels differently */ | |
725 | if (sdmac->event_id1) { | |
726 | sdmac->event_mask1 = 1 << (sdmac->event_id1 % 32); | |
727 | if (sdmac->event_id1 > 31) | |
728 | sdmac->watermark_level |= 1 << 31; | |
729 | sdmac->event_mask0 = 1 << (sdmac->event_id0 % 32); | |
730 | if (sdmac->event_id0 > 31) | |
731 | sdmac->watermark_level |= 1 << 30; | |
732 | } else { | |
733 | sdmac->event_mask0 = 1 << sdmac->event_id0; | |
734 | sdmac->event_mask1 = 1 << (sdmac->event_id0 - 32); | |
735 | } | |
736 | /* Watermark Level */ | |
737 | sdmac->watermark_level |= sdmac->watermark_level; | |
738 | /* Address */ | |
739 | sdmac->shp_addr = sdmac->per_address; | |
740 | } else { | |
741 | sdmac->watermark_level = 0; /* FIXME: M3_BASE_ADDRESS */ | |
742 | } | |
743 | ||
744 | ret = sdma_load_context(sdmac); | |
745 | ||
746 | return ret; | |
747 | } | |
748 | ||
749 | static int sdma_set_channel_priority(struct sdma_channel *sdmac, | |
750 | unsigned int priority) | |
751 | { | |
752 | struct sdma_engine *sdma = sdmac->sdma; | |
753 | int channel = sdmac->channel; | |
754 | ||
755 | if (priority < MXC_SDMA_MIN_PRIORITY | |
756 | || priority > MXC_SDMA_MAX_PRIORITY) { | |
757 | return -EINVAL; | |
758 | } | |
759 | ||
760 | __raw_writel(priority, sdma->regs + SDMA_CHNPRI_0 + 4 * channel); | |
761 | ||
762 | return 0; | |
763 | } | |
764 | ||
765 | static int sdma_request_channel(struct sdma_channel *sdmac) | |
766 | { | |
767 | struct sdma_engine *sdma = sdmac->sdma; | |
768 | int channel = sdmac->channel; | |
769 | int ret = -EBUSY; | |
770 | ||
771 | sdmac->bd = dma_alloc_coherent(NULL, PAGE_SIZE, &sdmac->bd_phys, GFP_KERNEL); | |
772 | if (!sdmac->bd) { | |
773 | ret = -ENOMEM; | |
774 | goto out; | |
775 | } | |
776 | ||
777 | memset(sdmac->bd, 0, PAGE_SIZE); | |
778 | ||
779 | sdma->channel_control[channel].base_bd_ptr = sdmac->bd_phys; | |
780 | sdma->channel_control[channel].current_bd_ptr = sdmac->bd_phys; | |
781 | ||
782 | clk_enable(sdma->clk); | |
783 | ||
784 | sdma_set_channel_priority(sdmac, MXC_SDMA_DEFAULT_PRIORITY); | |
785 | ||
786 | init_completion(&sdmac->done); | |
787 | ||
788 | sdmac->buf_tail = 0; | |
789 | ||
790 | return 0; | |
791 | out: | |
792 | ||
793 | return ret; | |
794 | } | |
795 | ||
796 | static void sdma_enable_channel(struct sdma_engine *sdma, int channel) | |
797 | { | |
798 | __raw_writel(1 << channel, sdma->regs + SDMA_H_START); | |
799 | } | |
800 | ||
d718f4eb | 801 | static dma_cookie_t sdma_assign_cookie(struct sdma_channel *sdmac) |
1ec1e82f | 802 | { |
d718f4eb | 803 | dma_cookie_t cookie = sdmac->chan.cookie; |
1ec1e82f SH |
804 | |
805 | if (++cookie < 0) | |
806 | cookie = 1; | |
807 | ||
d718f4eb SG |
808 | sdmac->chan.cookie = cookie; |
809 | sdmac->desc.cookie = cookie; | |
1ec1e82f SH |
810 | |
811 | return cookie; | |
812 | } | |
813 | ||
814 | static struct sdma_channel *to_sdma_chan(struct dma_chan *chan) | |
815 | { | |
816 | return container_of(chan, struct sdma_channel, chan); | |
817 | } | |
818 | ||
819 | static dma_cookie_t sdma_tx_submit(struct dma_async_tx_descriptor *tx) | |
820 | { | |
821 | struct sdma_channel *sdmac = to_sdma_chan(tx->chan); | |
822 | struct sdma_engine *sdma = sdmac->sdma; | |
823 | dma_cookie_t cookie; | |
824 | ||
825 | spin_lock_irq(&sdmac->lock); | |
826 | ||
827 | cookie = sdma_assign_cookie(sdmac); | |
828 | ||
23889c63 | 829 | sdma_enable_channel(sdma, sdmac->channel); |
1ec1e82f SH |
830 | |
831 | spin_unlock_irq(&sdmac->lock); | |
832 | ||
833 | return cookie; | |
834 | } | |
835 | ||
836 | static int sdma_alloc_chan_resources(struct dma_chan *chan) | |
837 | { | |
838 | struct sdma_channel *sdmac = to_sdma_chan(chan); | |
839 | struct imx_dma_data *data = chan->private; | |
840 | int prio, ret; | |
841 | ||
1ec1e82f SH |
842 | if (!data) |
843 | return -EINVAL; | |
844 | ||
845 | switch (data->priority) { | |
846 | case DMA_PRIO_HIGH: | |
847 | prio = 3; | |
848 | break; | |
849 | case DMA_PRIO_MEDIUM: | |
850 | prio = 2; | |
851 | break; | |
852 | case DMA_PRIO_LOW: | |
853 | default: | |
854 | prio = 1; | |
855 | break; | |
856 | } | |
857 | ||
858 | sdmac->peripheral_type = data->peripheral_type; | |
859 | sdmac->event_id0 = data->dma_request; | |
860 | ret = sdma_set_channel_priority(sdmac, prio); | |
861 | if (ret) | |
862 | return ret; | |
863 | ||
864 | ret = sdma_request_channel(sdmac); | |
865 | if (ret) | |
866 | return ret; | |
867 | ||
868 | dma_async_tx_descriptor_init(&sdmac->desc, chan); | |
869 | sdmac->desc.tx_submit = sdma_tx_submit; | |
870 | /* txd.flags will be overwritten in prep funcs */ | |
871 | sdmac->desc.flags = DMA_CTRL_ACK; | |
872 | ||
873 | return 0; | |
874 | } | |
875 | ||
876 | static void sdma_free_chan_resources(struct dma_chan *chan) | |
877 | { | |
878 | struct sdma_channel *sdmac = to_sdma_chan(chan); | |
879 | struct sdma_engine *sdma = sdmac->sdma; | |
880 | ||
881 | sdma_disable_channel(sdmac); | |
882 | ||
883 | if (sdmac->event_id0) | |
884 | sdma_event_disable(sdmac, sdmac->event_id0); | |
885 | if (sdmac->event_id1) | |
886 | sdma_event_disable(sdmac, sdmac->event_id1); | |
887 | ||
888 | sdmac->event_id0 = 0; | |
889 | sdmac->event_id1 = 0; | |
890 | ||
891 | sdma_set_channel_priority(sdmac, 0); | |
892 | ||
893 | dma_free_coherent(NULL, PAGE_SIZE, sdmac->bd, sdmac->bd_phys); | |
894 | ||
895 | clk_disable(sdma->clk); | |
896 | } | |
897 | ||
898 | static struct dma_async_tx_descriptor *sdma_prep_slave_sg( | |
899 | struct dma_chan *chan, struct scatterlist *sgl, | |
900 | unsigned int sg_len, enum dma_data_direction direction, | |
901 | unsigned long flags) | |
902 | { | |
903 | struct sdma_channel *sdmac = to_sdma_chan(chan); | |
904 | struct sdma_engine *sdma = sdmac->sdma; | |
905 | int ret, i, count; | |
23889c63 | 906 | int channel = sdmac->channel; |
1ec1e82f SH |
907 | struct scatterlist *sg; |
908 | ||
909 | if (sdmac->status == DMA_IN_PROGRESS) | |
910 | return NULL; | |
911 | sdmac->status = DMA_IN_PROGRESS; | |
912 | ||
913 | sdmac->flags = 0; | |
914 | ||
915 | dev_dbg(sdma->dev, "setting up %d entries for channel %d.\n", | |
916 | sg_len, channel); | |
917 | ||
918 | sdmac->direction = direction; | |
919 | ret = sdma_load_context(sdmac); | |
920 | if (ret) | |
921 | goto err_out; | |
922 | ||
923 | if (sg_len > NUM_BD) { | |
924 | dev_err(sdma->dev, "SDMA channel %d: maximum number of sg exceeded: %d > %d\n", | |
925 | channel, sg_len, NUM_BD); | |
926 | ret = -EINVAL; | |
927 | goto err_out; | |
928 | } | |
929 | ||
930 | for_each_sg(sgl, sg, sg_len, i) { | |
931 | struct sdma_buffer_descriptor *bd = &sdmac->bd[i]; | |
932 | int param; | |
933 | ||
d2f5c276 | 934 | bd->buffer_addr = sg->dma_address; |
1ec1e82f SH |
935 | |
936 | count = sg->length; | |
937 | ||
938 | if (count > 0xffff) { | |
939 | dev_err(sdma->dev, "SDMA channel %d: maximum bytes for sg entry exceeded: %d > %d\n", | |
940 | channel, count, 0xffff); | |
941 | ret = -EINVAL; | |
942 | goto err_out; | |
943 | } | |
944 | ||
945 | bd->mode.count = count; | |
946 | ||
947 | if (sdmac->word_size > DMA_SLAVE_BUSWIDTH_4_BYTES) { | |
948 | ret = -EINVAL; | |
949 | goto err_out; | |
950 | } | |
1fa81c27 SH |
951 | |
952 | switch (sdmac->word_size) { | |
953 | case DMA_SLAVE_BUSWIDTH_4_BYTES: | |
1ec1e82f | 954 | bd->mode.command = 0; |
1fa81c27 SH |
955 | if (count & 3 || sg->dma_address & 3) |
956 | return NULL; | |
957 | break; | |
958 | case DMA_SLAVE_BUSWIDTH_2_BYTES: | |
959 | bd->mode.command = 2; | |
960 | if (count & 1 || sg->dma_address & 1) | |
961 | return NULL; | |
962 | break; | |
963 | case DMA_SLAVE_BUSWIDTH_1_BYTE: | |
964 | bd->mode.command = 1; | |
965 | break; | |
966 | default: | |
967 | return NULL; | |
968 | } | |
1ec1e82f SH |
969 | |
970 | param = BD_DONE | BD_EXTD | BD_CONT; | |
971 | ||
341b9419 | 972 | if (i + 1 == sg_len) { |
1ec1e82f | 973 | param |= BD_INTR; |
341b9419 SG |
974 | param |= BD_LAST; |
975 | param &= ~BD_CONT; | |
1ec1e82f SH |
976 | } |
977 | ||
1ec1e82f SH |
978 | dev_dbg(sdma->dev, "entry %d: count: %d dma: 0x%08x %s%s\n", |
979 | i, count, sg->dma_address, | |
980 | param & BD_WRAP ? "wrap" : "", | |
981 | param & BD_INTR ? " intr" : ""); | |
982 | ||
983 | bd->mode.status = param; | |
984 | } | |
985 | ||
986 | sdmac->num_bd = sg_len; | |
987 | sdma->channel_control[channel].current_bd_ptr = sdmac->bd_phys; | |
988 | ||
989 | return &sdmac->desc; | |
990 | err_out: | |
4b2ce9dd | 991 | sdmac->status = DMA_ERROR; |
1ec1e82f SH |
992 | return NULL; |
993 | } | |
994 | ||
995 | static struct dma_async_tx_descriptor *sdma_prep_dma_cyclic( | |
996 | struct dma_chan *chan, dma_addr_t dma_addr, size_t buf_len, | |
997 | size_t period_len, enum dma_data_direction direction) | |
998 | { | |
999 | struct sdma_channel *sdmac = to_sdma_chan(chan); | |
1000 | struct sdma_engine *sdma = sdmac->sdma; | |
1001 | int num_periods = buf_len / period_len; | |
23889c63 | 1002 | int channel = sdmac->channel; |
1ec1e82f SH |
1003 | int ret, i = 0, buf = 0; |
1004 | ||
1005 | dev_dbg(sdma->dev, "%s channel: %d\n", __func__, channel); | |
1006 | ||
1007 | if (sdmac->status == DMA_IN_PROGRESS) | |
1008 | return NULL; | |
1009 | ||
1010 | sdmac->status = DMA_IN_PROGRESS; | |
1011 | ||
1012 | sdmac->flags |= IMX_DMA_SG_LOOP; | |
1013 | sdmac->direction = direction; | |
1014 | ret = sdma_load_context(sdmac); | |
1015 | if (ret) | |
1016 | goto err_out; | |
1017 | ||
1018 | if (num_periods > NUM_BD) { | |
1019 | dev_err(sdma->dev, "SDMA channel %d: maximum number of sg exceeded: %d > %d\n", | |
1020 | channel, num_periods, NUM_BD); | |
1021 | goto err_out; | |
1022 | } | |
1023 | ||
1024 | if (period_len > 0xffff) { | |
1025 | dev_err(sdma->dev, "SDMA channel %d: maximum period size exceeded: %d > %d\n", | |
1026 | channel, period_len, 0xffff); | |
1027 | goto err_out; | |
1028 | } | |
1029 | ||
1030 | while (buf < buf_len) { | |
1031 | struct sdma_buffer_descriptor *bd = &sdmac->bd[i]; | |
1032 | int param; | |
1033 | ||
1034 | bd->buffer_addr = dma_addr; | |
1035 | ||
1036 | bd->mode.count = period_len; | |
1037 | ||
1038 | if (sdmac->word_size > DMA_SLAVE_BUSWIDTH_4_BYTES) | |
1039 | goto err_out; | |
1040 | if (sdmac->word_size == DMA_SLAVE_BUSWIDTH_4_BYTES) | |
1041 | bd->mode.command = 0; | |
1042 | else | |
1043 | bd->mode.command = sdmac->word_size; | |
1044 | ||
1045 | param = BD_DONE | BD_EXTD | BD_CONT | BD_INTR; | |
1046 | if (i + 1 == num_periods) | |
1047 | param |= BD_WRAP; | |
1048 | ||
1049 | dev_dbg(sdma->dev, "entry %d: count: %d dma: 0x%08x %s%s\n", | |
1050 | i, period_len, dma_addr, | |
1051 | param & BD_WRAP ? "wrap" : "", | |
1052 | param & BD_INTR ? " intr" : ""); | |
1053 | ||
1054 | bd->mode.status = param; | |
1055 | ||
1056 | dma_addr += period_len; | |
1057 | buf += period_len; | |
1058 | ||
1059 | i++; | |
1060 | } | |
1061 | ||
1062 | sdmac->num_bd = num_periods; | |
1063 | sdma->channel_control[channel].current_bd_ptr = sdmac->bd_phys; | |
1064 | ||
1065 | return &sdmac->desc; | |
1066 | err_out: | |
1067 | sdmac->status = DMA_ERROR; | |
1068 | return NULL; | |
1069 | } | |
1070 | ||
1071 | static int sdma_control(struct dma_chan *chan, enum dma_ctrl_cmd cmd, | |
1072 | unsigned long arg) | |
1073 | { | |
1074 | struct sdma_channel *sdmac = to_sdma_chan(chan); | |
1075 | struct dma_slave_config *dmaengine_cfg = (void *)arg; | |
1076 | ||
1077 | switch (cmd) { | |
1078 | case DMA_TERMINATE_ALL: | |
1079 | sdma_disable_channel(sdmac); | |
1080 | return 0; | |
1081 | case DMA_SLAVE_CONFIG: | |
1082 | if (dmaengine_cfg->direction == DMA_FROM_DEVICE) { | |
1083 | sdmac->per_address = dmaengine_cfg->src_addr; | |
1084 | sdmac->watermark_level = dmaengine_cfg->src_maxburst; | |
1085 | sdmac->word_size = dmaengine_cfg->src_addr_width; | |
1086 | } else { | |
1087 | sdmac->per_address = dmaengine_cfg->dst_addr; | |
1088 | sdmac->watermark_level = dmaengine_cfg->dst_maxburst; | |
1089 | sdmac->word_size = dmaengine_cfg->dst_addr_width; | |
1090 | } | |
1091 | return sdma_config_channel(sdmac); | |
1092 | default: | |
1093 | return -ENOSYS; | |
1094 | } | |
1095 | ||
1096 | return -EINVAL; | |
1097 | } | |
1098 | ||
1099 | static enum dma_status sdma_tx_status(struct dma_chan *chan, | |
1100 | dma_cookie_t cookie, | |
1101 | struct dma_tx_state *txstate) | |
1102 | { | |
1103 | struct sdma_channel *sdmac = to_sdma_chan(chan); | |
1104 | dma_cookie_t last_used; | |
1ec1e82f SH |
1105 | |
1106 | last_used = chan->cookie; | |
1107 | ||
1ec1e82f SH |
1108 | dma_set_tx_state(txstate, sdmac->last_completed, last_used, 0); |
1109 | ||
8a965911 | 1110 | return sdmac->status; |
1ec1e82f SH |
1111 | } |
1112 | ||
1113 | static void sdma_issue_pending(struct dma_chan *chan) | |
1114 | { | |
1115 | /* | |
1116 | * Nothing to do. We only have a single descriptor | |
1117 | */ | |
1118 | } | |
1119 | ||
5b28aa31 SH |
1120 | #define SDMA_SCRIPT_ADDRS_ARRAY_SIZE_V1 34 |
1121 | ||
1122 | static void sdma_add_scripts(struct sdma_engine *sdma, | |
1123 | const struct sdma_script_start_addrs *addr) | |
1124 | { | |
1125 | s32 *addr_arr = (u32 *)addr; | |
1126 | s32 *saddr_arr = (u32 *)sdma->script_addrs; | |
1127 | int i; | |
1128 | ||
1129 | for (i = 0; i < SDMA_SCRIPT_ADDRS_ARRAY_SIZE_V1; i++) | |
1130 | if (addr_arr[i] > 0) | |
1131 | saddr_arr[i] = addr_arr[i]; | |
1132 | } | |
1133 | ||
1134 | static int __init sdma_get_firmware(struct sdma_engine *sdma, | |
2e534b21 | 1135 | const char *fw_name) |
5b28aa31 SH |
1136 | { |
1137 | const struct firmware *fw; | |
5b28aa31 SH |
1138 | const struct sdma_firmware_header *header; |
1139 | int ret; | |
1140 | const struct sdma_script_start_addrs *addr; | |
1141 | unsigned short *ram_code; | |
1142 | ||
40ad5b37 SG |
1143 | ret = request_firmware(&fw, fw_name, sdma->dev); |
1144 | if (ret) | |
5b28aa31 | 1145 | return ret; |
5b28aa31 SH |
1146 | |
1147 | if (fw->size < sizeof(*header)) | |
1148 | goto err_firmware; | |
1149 | ||
1150 | header = (struct sdma_firmware_header *)fw->data; | |
1151 | ||
1152 | if (header->magic != SDMA_FIRMWARE_MAGIC) | |
1153 | goto err_firmware; | |
1154 | if (header->ram_code_start + header->ram_code_size > fw->size) | |
1155 | goto err_firmware; | |
1156 | ||
1157 | addr = (void *)header + header->script_addrs_start; | |
1158 | ram_code = (void *)header + header->ram_code_start; | |
1159 | ||
1160 | clk_enable(sdma->clk); | |
1161 | /* download the RAM image for SDMA */ | |
1162 | sdma_load_script(sdma, ram_code, | |
1163 | header->ram_code_size, | |
6866fd3b | 1164 | addr->ram_code_start_addr); |
5b28aa31 SH |
1165 | clk_disable(sdma->clk); |
1166 | ||
1167 | sdma_add_scripts(sdma, addr); | |
1168 | ||
1169 | dev_info(sdma->dev, "loaded firmware %d.%d\n", | |
1170 | header->version_major, | |
1171 | header->version_minor); | |
1172 | ||
1173 | err_firmware: | |
1174 | release_firmware(fw); | |
1175 | ||
1176 | return ret; | |
1177 | } | |
1178 | ||
1179 | static int __init sdma_init(struct sdma_engine *sdma) | |
1ec1e82f SH |
1180 | { |
1181 | int i, ret; | |
1182 | dma_addr_t ccb_phys; | |
1183 | ||
62550cd7 SG |
1184 | switch (sdma->devtype) { |
1185 | case IMX31_SDMA: | |
1ec1e82f SH |
1186 | sdma->num_events = 32; |
1187 | break; | |
62550cd7 | 1188 | case IMX35_SDMA: |
1ec1e82f SH |
1189 | sdma->num_events = 48; |
1190 | break; | |
1191 | default: | |
62550cd7 SG |
1192 | dev_err(sdma->dev, "Unknown sdma type %d. aborting\n", |
1193 | sdma->devtype); | |
1ec1e82f SH |
1194 | return -ENODEV; |
1195 | } | |
1196 | ||
1197 | clk_enable(sdma->clk); | |
1198 | ||
1199 | /* Be sure SDMA has not started yet */ | |
1200 | __raw_writel(0, sdma->regs + SDMA_H_C0PTR); | |
1201 | ||
1202 | sdma->channel_control = dma_alloc_coherent(NULL, | |
1203 | MAX_DMA_CHANNELS * sizeof (struct sdma_channel_control) + | |
1204 | sizeof(struct sdma_context_data), | |
1205 | &ccb_phys, GFP_KERNEL); | |
1206 | ||
1207 | if (!sdma->channel_control) { | |
1208 | ret = -ENOMEM; | |
1209 | goto err_dma_alloc; | |
1210 | } | |
1211 | ||
1212 | sdma->context = (void *)sdma->channel_control + | |
1213 | MAX_DMA_CHANNELS * sizeof (struct sdma_channel_control); | |
1214 | sdma->context_phys = ccb_phys + | |
1215 | MAX_DMA_CHANNELS * sizeof (struct sdma_channel_control); | |
1216 | ||
1217 | /* Zero-out the CCB structures array just allocated */ | |
1218 | memset(sdma->channel_control, 0, | |
1219 | MAX_DMA_CHANNELS * sizeof (struct sdma_channel_control)); | |
1220 | ||
1221 | /* disable all channels */ | |
1222 | for (i = 0; i < sdma->num_events; i++) | |
1223 | __raw_writel(0, sdma->regs + chnenbl_ofs(sdma, i)); | |
1224 | ||
1225 | /* All channels have priority 0 */ | |
1226 | for (i = 0; i < MAX_DMA_CHANNELS; i++) | |
1227 | __raw_writel(0, sdma->regs + SDMA_CHNPRI_0 + i * 4); | |
1228 | ||
1229 | ret = sdma_request_channel(&sdma->channel[0]); | |
1230 | if (ret) | |
1231 | goto err_dma_alloc; | |
1232 | ||
1233 | sdma_config_ownership(&sdma->channel[0], false, true, false); | |
1234 | ||
1235 | /* Set Command Channel (Channel Zero) */ | |
1236 | __raw_writel(0x4050, sdma->regs + SDMA_CHN0ADDR); | |
1237 | ||
1238 | /* Set bits of CONFIG register but with static context switching */ | |
1239 | /* FIXME: Check whether to set ACR bit depending on clock ratios */ | |
1240 | __raw_writel(0, sdma->regs + SDMA_H_CONFIG); | |
1241 | ||
1242 | __raw_writel(ccb_phys, sdma->regs + SDMA_H_C0PTR); | |
1243 | ||
1ec1e82f SH |
1244 | /* Set bits of CONFIG register with given context switching mode */ |
1245 | __raw_writel(SDMA_H_CONFIG_CSM, sdma->regs + SDMA_H_CONFIG); | |
1246 | ||
1247 | /* Initializes channel's priorities */ | |
1248 | sdma_set_channel_priority(&sdma->channel[0], 7); | |
1249 | ||
1250 | clk_disable(sdma->clk); | |
1251 | ||
1252 | return 0; | |
1253 | ||
1254 | err_dma_alloc: | |
1255 | clk_disable(sdma->clk); | |
1256 | dev_err(sdma->dev, "initialisation failed with %d\n", ret); | |
1257 | return ret; | |
1258 | } | |
1259 | ||
1260 | static int __init sdma_probe(struct platform_device *pdev) | |
1261 | { | |
580975d7 SG |
1262 | const struct of_device_id *of_id = |
1263 | of_match_device(sdma_dt_ids, &pdev->dev); | |
1264 | struct device_node *np = pdev->dev.of_node; | |
1265 | const char *fw_name; | |
1ec1e82f | 1266 | int ret; |
1ec1e82f | 1267 | int irq; |
1ec1e82f SH |
1268 | struct resource *iores; |
1269 | struct sdma_platform_data *pdata = pdev->dev.platform_data; | |
1ec1e82f | 1270 | int i; |
1ec1e82f SH |
1271 | struct sdma_engine *sdma; |
1272 | ||
1273 | sdma = kzalloc(sizeof(*sdma), GFP_KERNEL); | |
1274 | if (!sdma) | |
1275 | return -ENOMEM; | |
1276 | ||
1277 | sdma->dev = &pdev->dev; | |
1278 | ||
1279 | iores = platform_get_resource(pdev, IORESOURCE_MEM, 0); | |
1280 | irq = platform_get_irq(pdev, 0); | |
580975d7 | 1281 | if (!iores || irq < 0) { |
1ec1e82f SH |
1282 | ret = -EINVAL; |
1283 | goto err_irq; | |
1284 | } | |
1285 | ||
1286 | if (!request_mem_region(iores->start, resource_size(iores), pdev->name)) { | |
1287 | ret = -EBUSY; | |
1288 | goto err_request_region; | |
1289 | } | |
1290 | ||
1291 | sdma->clk = clk_get(&pdev->dev, NULL); | |
1292 | if (IS_ERR(sdma->clk)) { | |
1293 | ret = PTR_ERR(sdma->clk); | |
1294 | goto err_clk; | |
1295 | } | |
1296 | ||
1297 | sdma->regs = ioremap(iores->start, resource_size(iores)); | |
1298 | if (!sdma->regs) { | |
1299 | ret = -ENOMEM; | |
1300 | goto err_ioremap; | |
1301 | } | |
1302 | ||
1303 | ret = request_irq(irq, sdma_int_handler, 0, "sdma", sdma); | |
1304 | if (ret) | |
1305 | goto err_request_irq; | |
1306 | ||
5b28aa31 | 1307 | sdma->script_addrs = kzalloc(sizeof(*sdma->script_addrs), GFP_KERNEL); |
1c1d9547 AL |
1308 | if (!sdma->script_addrs) { |
1309 | ret = -ENOMEM; | |
5b28aa31 | 1310 | goto err_alloc; |
1c1d9547 | 1311 | } |
1ec1e82f | 1312 | |
580975d7 SG |
1313 | if (of_id) |
1314 | pdev->id_entry = of_id->data; | |
62550cd7 | 1315 | sdma->devtype = pdev->id_entry->driver_data; |
1ec1e82f | 1316 | |
7214a8b1 SH |
1317 | dma_cap_set(DMA_SLAVE, sdma->dma_device.cap_mask); |
1318 | dma_cap_set(DMA_CYCLIC, sdma->dma_device.cap_mask); | |
1319 | ||
1ec1e82f SH |
1320 | INIT_LIST_HEAD(&sdma->dma_device.channels); |
1321 | /* Initialize channel parameters */ | |
1322 | for (i = 0; i < MAX_DMA_CHANNELS; i++) { | |
1323 | struct sdma_channel *sdmac = &sdma->channel[i]; | |
1324 | ||
1325 | sdmac->sdma = sdma; | |
1326 | spin_lock_init(&sdmac->lock); | |
1327 | ||
1ec1e82f | 1328 | sdmac->chan.device = &sdma->dma_device; |
1ec1e82f SH |
1329 | sdmac->channel = i; |
1330 | ||
23889c63 SH |
1331 | /* |
1332 | * Add the channel to the DMAC list. Do not add channel 0 though | |
1333 | * because we need it internally in the SDMA driver. This also means | |
1334 | * that channel 0 in dmaengine counting matches sdma channel 1. | |
1335 | */ | |
1336 | if (i) | |
1337 | list_add_tail(&sdmac->chan.device_node, | |
1338 | &sdma->dma_device.channels); | |
1ec1e82f SH |
1339 | } |
1340 | ||
5b28aa31 | 1341 | ret = sdma_init(sdma); |
1ec1e82f SH |
1342 | if (ret) |
1343 | goto err_init; | |
1344 | ||
580975d7 | 1345 | if (pdata && pdata->script_addrs) |
5b28aa31 SH |
1346 | sdma_add_scripts(sdma, pdata->script_addrs); |
1347 | ||
580975d7 SG |
1348 | if (pdata) { |
1349 | sdma_get_firmware(sdma, pdata->fw_name); | |
1350 | } else { | |
1351 | /* | |
1352 | * Because that device tree does not encode ROM script address, | |
1353 | * the RAM script in firmware is mandatory for device tree | |
1354 | * probe, otherwise it fails. | |
1355 | */ | |
1356 | ret = of_property_read_string(np, "fsl,sdma-ram-script-name", | |
1357 | &fw_name); | |
1358 | if (ret) { | |
1359 | dev_err(&pdev->dev, "failed to get firmware name\n"); | |
1360 | goto err_init; | |
1361 | } | |
1362 | ||
1363 | ret = sdma_get_firmware(sdma, fw_name); | |
1364 | if (ret) { | |
1365 | dev_err(&pdev->dev, "failed to get firmware\n"); | |
1366 | goto err_init; | |
1367 | } | |
1368 | } | |
5b28aa31 | 1369 | |
1ec1e82f SH |
1370 | sdma->dma_device.dev = &pdev->dev; |
1371 | ||
1372 | sdma->dma_device.device_alloc_chan_resources = sdma_alloc_chan_resources; | |
1373 | sdma->dma_device.device_free_chan_resources = sdma_free_chan_resources; | |
1374 | sdma->dma_device.device_tx_status = sdma_tx_status; | |
1375 | sdma->dma_device.device_prep_slave_sg = sdma_prep_slave_sg; | |
1376 | sdma->dma_device.device_prep_dma_cyclic = sdma_prep_dma_cyclic; | |
1377 | sdma->dma_device.device_control = sdma_control; | |
1378 | sdma->dma_device.device_issue_pending = sdma_issue_pending; | |
b9b3f82f SH |
1379 | sdma->dma_device.dev->dma_parms = &sdma->dma_parms; |
1380 | dma_set_max_seg_size(sdma->dma_device.dev, 65535); | |
1ec1e82f SH |
1381 | |
1382 | ret = dma_async_device_register(&sdma->dma_device); | |
1383 | if (ret) { | |
1384 | dev_err(&pdev->dev, "unable to register\n"); | |
1385 | goto err_init; | |
1386 | } | |
1387 | ||
5b28aa31 | 1388 | dev_info(sdma->dev, "initialized\n"); |
1ec1e82f SH |
1389 | |
1390 | return 0; | |
1391 | ||
1392 | err_init: | |
1393 | kfree(sdma->script_addrs); | |
5b28aa31 | 1394 | err_alloc: |
1ec1e82f SH |
1395 | free_irq(irq, sdma); |
1396 | err_request_irq: | |
1397 | iounmap(sdma->regs); | |
1398 | err_ioremap: | |
1399 | clk_put(sdma->clk); | |
1400 | err_clk: | |
1401 | release_mem_region(iores->start, resource_size(iores)); | |
1402 | err_request_region: | |
1403 | err_irq: | |
1404 | kfree(sdma); | |
939fd4f0 | 1405 | return ret; |
1ec1e82f SH |
1406 | } |
1407 | ||
1408 | static int __exit sdma_remove(struct platform_device *pdev) | |
1409 | { | |
1410 | return -EBUSY; | |
1411 | } | |
1412 | ||
1413 | static struct platform_driver sdma_driver = { | |
1414 | .driver = { | |
1415 | .name = "imx-sdma", | |
580975d7 | 1416 | .of_match_table = sdma_dt_ids, |
1ec1e82f | 1417 | }, |
62550cd7 | 1418 | .id_table = sdma_devtypes, |
1ec1e82f SH |
1419 | .remove = __exit_p(sdma_remove), |
1420 | }; | |
1421 | ||
1422 | static int __init sdma_module_init(void) | |
1423 | { | |
1424 | return platform_driver_probe(&sdma_driver, sdma_probe); | |
1425 | } | |
c989a7fc | 1426 | module_init(sdma_module_init); |
1ec1e82f SH |
1427 | |
1428 | MODULE_AUTHOR("Sascha Hauer, Pengutronix <s.hauer@pengutronix.de>"); | |
1429 | MODULE_DESCRIPTION("i.MX SDMA driver"); | |
1430 | MODULE_LICENSE("GPL"); |