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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> | |
f8de8f4c | 21 | #include <linux/module.h> |
1ec1e82f SH |
22 | #include <linux/types.h> |
23 | #include <linux/mm.h> | |
24 | #include <linux/interrupt.h> | |
25 | #include <linux/clk.h> | |
26 | #include <linux/wait.h> | |
27 | #include <linux/sched.h> | |
28 | #include <linux/semaphore.h> | |
29 | #include <linux/spinlock.h> | |
30 | #include <linux/device.h> | |
31 | #include <linux/dma-mapping.h> | |
32 | #include <linux/firmware.h> | |
33 | #include <linux/slab.h> | |
34 | #include <linux/platform_device.h> | |
35 | #include <linux/dmaengine.h> | |
580975d7 SG |
36 | #include <linux/of.h> |
37 | #include <linux/of_device.h> | |
5c45ad77 | 38 | #include <linux/module.h> |
1ec1e82f SH |
39 | |
40 | #include <asm/irq.h> | |
41 | #include <mach/sdma.h> | |
42 | #include <mach/dma.h> | |
43 | #include <mach/hardware.h> | |
44 | ||
45 | /* SDMA registers */ | |
46 | #define SDMA_H_C0PTR 0x000 | |
47 | #define SDMA_H_INTR 0x004 | |
48 | #define SDMA_H_STATSTOP 0x008 | |
49 | #define SDMA_H_START 0x00c | |
50 | #define SDMA_H_EVTOVR 0x010 | |
51 | #define SDMA_H_DSPOVR 0x014 | |
52 | #define SDMA_H_HOSTOVR 0x018 | |
53 | #define SDMA_H_EVTPEND 0x01c | |
54 | #define SDMA_H_DSPENBL 0x020 | |
55 | #define SDMA_H_RESET 0x024 | |
56 | #define SDMA_H_EVTERR 0x028 | |
57 | #define SDMA_H_INTRMSK 0x02c | |
58 | #define SDMA_H_PSW 0x030 | |
59 | #define SDMA_H_EVTERRDBG 0x034 | |
60 | #define SDMA_H_CONFIG 0x038 | |
61 | #define SDMA_ONCE_ENB 0x040 | |
62 | #define SDMA_ONCE_DATA 0x044 | |
63 | #define SDMA_ONCE_INSTR 0x048 | |
64 | #define SDMA_ONCE_STAT 0x04c | |
65 | #define SDMA_ONCE_CMD 0x050 | |
66 | #define SDMA_EVT_MIRROR 0x054 | |
67 | #define SDMA_ILLINSTADDR 0x058 | |
68 | #define SDMA_CHN0ADDR 0x05c | |
69 | #define SDMA_ONCE_RTB 0x060 | |
70 | #define SDMA_XTRIG_CONF1 0x070 | |
71 | #define SDMA_XTRIG_CONF2 0x074 | |
62550cd7 SG |
72 | #define SDMA_CHNENBL0_IMX35 0x200 |
73 | #define SDMA_CHNENBL0_IMX31 0x080 | |
1ec1e82f SH |
74 | #define SDMA_CHNPRI_0 0x100 |
75 | ||
76 | /* | |
77 | * Buffer descriptor status values. | |
78 | */ | |
79 | #define BD_DONE 0x01 | |
80 | #define BD_WRAP 0x02 | |
81 | #define BD_CONT 0x04 | |
82 | #define BD_INTR 0x08 | |
83 | #define BD_RROR 0x10 | |
84 | #define BD_LAST 0x20 | |
85 | #define BD_EXTD 0x80 | |
86 | ||
87 | /* | |
88 | * Data Node descriptor status values. | |
89 | */ | |
90 | #define DND_END_OF_FRAME 0x80 | |
91 | #define DND_END_OF_XFER 0x40 | |
92 | #define DND_DONE 0x20 | |
93 | #define DND_UNUSED 0x01 | |
94 | ||
95 | /* | |
96 | * IPCV2 descriptor status values. | |
97 | */ | |
98 | #define BD_IPCV2_END_OF_FRAME 0x40 | |
99 | ||
100 | #define IPCV2_MAX_NODES 50 | |
101 | /* | |
102 | * Error bit set in the CCB status field by the SDMA, | |
103 | * in setbd routine, in case of a transfer error | |
104 | */ | |
105 | #define DATA_ERROR 0x10000000 | |
106 | ||
107 | /* | |
108 | * Buffer descriptor commands. | |
109 | */ | |
110 | #define C0_ADDR 0x01 | |
111 | #define C0_LOAD 0x02 | |
112 | #define C0_DUMP 0x03 | |
113 | #define C0_SETCTX 0x07 | |
114 | #define C0_GETCTX 0x03 | |
115 | #define C0_SETDM 0x01 | |
116 | #define C0_SETPM 0x04 | |
117 | #define C0_GETDM 0x02 | |
118 | #define C0_GETPM 0x08 | |
119 | /* | |
120 | * Change endianness indicator in the BD command field | |
121 | */ | |
122 | #define CHANGE_ENDIANNESS 0x80 | |
123 | ||
124 | /* | |
125 | * Mode/Count of data node descriptors - IPCv2 | |
126 | */ | |
127 | struct sdma_mode_count { | |
128 | u32 count : 16; /* size of the buffer pointed by this BD */ | |
129 | u32 status : 8; /* E,R,I,C,W,D status bits stored here */ | |
130 | u32 command : 8; /* command mostlky used for channel 0 */ | |
131 | }; | |
132 | ||
133 | /* | |
134 | * Buffer descriptor | |
135 | */ | |
136 | struct sdma_buffer_descriptor { | |
137 | struct sdma_mode_count mode; | |
138 | u32 buffer_addr; /* address of the buffer described */ | |
139 | u32 ext_buffer_addr; /* extended buffer address */ | |
140 | } __attribute__ ((packed)); | |
141 | ||
142 | /** | |
143 | * struct sdma_channel_control - Channel control Block | |
144 | * | |
145 | * @current_bd_ptr current buffer descriptor processed | |
146 | * @base_bd_ptr first element of buffer descriptor array | |
147 | * @unused padding. The SDMA engine expects an array of 128 byte | |
148 | * control blocks | |
149 | */ | |
150 | struct sdma_channel_control { | |
151 | u32 current_bd_ptr; | |
152 | u32 base_bd_ptr; | |
153 | u32 unused[2]; | |
154 | } __attribute__ ((packed)); | |
155 | ||
156 | /** | |
157 | * struct sdma_state_registers - SDMA context for a channel | |
158 | * | |
159 | * @pc: program counter | |
160 | * @t: test bit: status of arithmetic & test instruction | |
161 | * @rpc: return program counter | |
162 | * @sf: source fault while loading data | |
163 | * @spc: loop start program counter | |
164 | * @df: destination fault while storing data | |
165 | * @epc: loop end program counter | |
166 | * @lm: loop mode | |
167 | */ | |
168 | struct sdma_state_registers { | |
169 | u32 pc :14; | |
170 | u32 unused1: 1; | |
171 | u32 t : 1; | |
172 | u32 rpc :14; | |
173 | u32 unused0: 1; | |
174 | u32 sf : 1; | |
175 | u32 spc :14; | |
176 | u32 unused2: 1; | |
177 | u32 df : 1; | |
178 | u32 epc :14; | |
179 | u32 lm : 2; | |
180 | } __attribute__ ((packed)); | |
181 | ||
182 | /** | |
183 | * struct sdma_context_data - sdma context specific to a channel | |
184 | * | |
185 | * @channel_state: channel state bits | |
186 | * @gReg: general registers | |
187 | * @mda: burst dma destination address register | |
188 | * @msa: burst dma source address register | |
189 | * @ms: burst dma status register | |
190 | * @md: burst dma data register | |
191 | * @pda: peripheral dma destination address register | |
192 | * @psa: peripheral dma source address register | |
193 | * @ps: peripheral dma status register | |
194 | * @pd: peripheral dma data register | |
195 | * @ca: CRC polynomial register | |
196 | * @cs: CRC accumulator register | |
197 | * @dda: dedicated core destination address register | |
198 | * @dsa: dedicated core source address register | |
199 | * @ds: dedicated core status register | |
200 | * @dd: dedicated core data register | |
201 | */ | |
202 | struct sdma_context_data { | |
203 | struct sdma_state_registers channel_state; | |
204 | u32 gReg[8]; | |
205 | u32 mda; | |
206 | u32 msa; | |
207 | u32 ms; | |
208 | u32 md; | |
209 | u32 pda; | |
210 | u32 psa; | |
211 | u32 ps; | |
212 | u32 pd; | |
213 | u32 ca; | |
214 | u32 cs; | |
215 | u32 dda; | |
216 | u32 dsa; | |
217 | u32 ds; | |
218 | u32 dd; | |
219 | u32 scratch0; | |
220 | u32 scratch1; | |
221 | u32 scratch2; | |
222 | u32 scratch3; | |
223 | u32 scratch4; | |
224 | u32 scratch5; | |
225 | u32 scratch6; | |
226 | u32 scratch7; | |
227 | } __attribute__ ((packed)); | |
228 | ||
229 | #define NUM_BD (int)(PAGE_SIZE / sizeof(struct sdma_buffer_descriptor)) | |
230 | ||
231 | struct sdma_engine; | |
232 | ||
233 | /** | |
234 | * struct sdma_channel - housekeeping for a SDMA channel | |
235 | * | |
236 | * @sdma pointer to the SDMA engine for this channel | |
23889c63 | 237 | * @channel the channel number, matches dmaengine chan_id + 1 |
1ec1e82f SH |
238 | * @direction transfer type. Needed for setting SDMA script |
239 | * @peripheral_type Peripheral type. Needed for setting SDMA script | |
240 | * @event_id0 aka dma request line | |
241 | * @event_id1 for channels that use 2 events | |
242 | * @word_size peripheral access size | |
243 | * @buf_tail ID of the buffer that was processed | |
244 | * @done channel completion | |
245 | * @num_bd max NUM_BD. number of descriptors currently handling | |
246 | */ | |
247 | struct sdma_channel { | |
248 | struct sdma_engine *sdma; | |
249 | unsigned int channel; | |
db8196df | 250 | enum dma_transfer_direction direction; |
1ec1e82f SH |
251 | enum sdma_peripheral_type peripheral_type; |
252 | unsigned int event_id0; | |
253 | unsigned int event_id1; | |
254 | enum dma_slave_buswidth word_size; | |
255 | unsigned int buf_tail; | |
256 | struct completion done; | |
257 | unsigned int num_bd; | |
258 | struct sdma_buffer_descriptor *bd; | |
259 | dma_addr_t bd_phys; | |
260 | unsigned int pc_from_device, pc_to_device; | |
261 | unsigned long flags; | |
262 | dma_addr_t per_address; | |
263 | u32 event_mask0, event_mask1; | |
264 | u32 watermark_level; | |
265 | u32 shp_addr, per_addr; | |
266 | struct dma_chan chan; | |
267 | spinlock_t lock; | |
268 | struct dma_async_tx_descriptor desc; | |
269 | dma_cookie_t last_completed; | |
270 | enum dma_status status; | |
271 | }; | |
272 | ||
273 | #define IMX_DMA_SG_LOOP (1 << 0) | |
274 | ||
275 | #define MAX_DMA_CHANNELS 32 | |
276 | #define MXC_SDMA_DEFAULT_PRIORITY 1 | |
277 | #define MXC_SDMA_MIN_PRIORITY 1 | |
278 | #define MXC_SDMA_MAX_PRIORITY 7 | |
279 | ||
1ec1e82f SH |
280 | #define SDMA_FIRMWARE_MAGIC 0x414d4453 |
281 | ||
282 | /** | |
283 | * struct sdma_firmware_header - Layout of the firmware image | |
284 | * | |
285 | * @magic "SDMA" | |
286 | * @version_major increased whenever layout of struct sdma_script_start_addrs | |
287 | * changes. | |
288 | * @version_minor firmware minor version (for binary compatible changes) | |
289 | * @script_addrs_start offset of struct sdma_script_start_addrs in this image | |
290 | * @num_script_addrs Number of script addresses in this image | |
291 | * @ram_code_start offset of SDMA ram image in this firmware image | |
292 | * @ram_code_size size of SDMA ram image | |
293 | * @script_addrs Stores the start address of the SDMA scripts | |
294 | * (in SDMA memory space) | |
295 | */ | |
296 | struct sdma_firmware_header { | |
297 | u32 magic; | |
298 | u32 version_major; | |
299 | u32 version_minor; | |
300 | u32 script_addrs_start; | |
301 | u32 num_script_addrs; | |
302 | u32 ram_code_start; | |
303 | u32 ram_code_size; | |
304 | }; | |
305 | ||
62550cd7 SG |
306 | enum sdma_devtype { |
307 | IMX31_SDMA, /* runs on i.mx31 */ | |
308 | IMX35_SDMA, /* runs on i.mx35 and later */ | |
309 | }; | |
310 | ||
1ec1e82f SH |
311 | struct sdma_engine { |
312 | struct device *dev; | |
b9b3f82f | 313 | struct device_dma_parameters dma_parms; |
1ec1e82f SH |
314 | struct sdma_channel channel[MAX_DMA_CHANNELS]; |
315 | struct sdma_channel_control *channel_control; | |
316 | void __iomem *regs; | |
62550cd7 | 317 | enum sdma_devtype devtype; |
1ec1e82f SH |
318 | unsigned int num_events; |
319 | struct sdma_context_data *context; | |
320 | dma_addr_t context_phys; | |
321 | struct dma_device dma_device; | |
322 | struct clk *clk; | |
73eab978 | 323 | struct mutex channel_0_lock; |
1ec1e82f SH |
324 | struct sdma_script_start_addrs *script_addrs; |
325 | }; | |
326 | ||
62550cd7 SG |
327 | static struct platform_device_id sdma_devtypes[] = { |
328 | { | |
329 | .name = "imx31-sdma", | |
330 | .driver_data = IMX31_SDMA, | |
331 | }, { | |
332 | .name = "imx35-sdma", | |
333 | .driver_data = IMX35_SDMA, | |
334 | }, { | |
335 | /* sentinel */ | |
336 | } | |
337 | }; | |
338 | MODULE_DEVICE_TABLE(platform, sdma_devtypes); | |
339 | ||
580975d7 SG |
340 | static const struct of_device_id sdma_dt_ids[] = { |
341 | { .compatible = "fsl,imx31-sdma", .data = &sdma_devtypes[IMX31_SDMA], }, | |
342 | { .compatible = "fsl,imx35-sdma", .data = &sdma_devtypes[IMX35_SDMA], }, | |
343 | { /* sentinel */ } | |
344 | }; | |
345 | MODULE_DEVICE_TABLE(of, sdma_dt_ids); | |
346 | ||
1ec1e82f SH |
347 | #define SDMA_H_CONFIG_DSPDMA (1 << 12) /* indicates if the DSPDMA is used */ |
348 | #define SDMA_H_CONFIG_RTD_PINS (1 << 11) /* indicates if Real-Time Debug pins are enabled */ | |
349 | #define SDMA_H_CONFIG_ACR (1 << 4) /* indicates if AHB freq /core freq = 2 or 1 */ | |
350 | #define SDMA_H_CONFIG_CSM (3) /* indicates which context switch mode is selected*/ | |
351 | ||
352 | static inline u32 chnenbl_ofs(struct sdma_engine *sdma, unsigned int event) | |
353 | { | |
62550cd7 SG |
354 | u32 chnenbl0 = (sdma->devtype == IMX31_SDMA ? SDMA_CHNENBL0_IMX31 : |
355 | SDMA_CHNENBL0_IMX35); | |
1ec1e82f SH |
356 | return chnenbl0 + event * 4; |
357 | } | |
358 | ||
359 | static int sdma_config_ownership(struct sdma_channel *sdmac, | |
360 | bool event_override, bool mcu_override, bool dsp_override) | |
361 | { | |
362 | struct sdma_engine *sdma = sdmac->sdma; | |
363 | int channel = sdmac->channel; | |
364 | u32 evt, mcu, dsp; | |
365 | ||
366 | if (event_override && mcu_override && dsp_override) | |
367 | return -EINVAL; | |
368 | ||
369 | evt = __raw_readl(sdma->regs + SDMA_H_EVTOVR); | |
370 | mcu = __raw_readl(sdma->regs + SDMA_H_HOSTOVR); | |
371 | dsp = __raw_readl(sdma->regs + SDMA_H_DSPOVR); | |
372 | ||
373 | if (dsp_override) | |
374 | dsp &= ~(1 << channel); | |
375 | else | |
376 | dsp |= (1 << channel); | |
377 | ||
378 | if (event_override) | |
379 | evt &= ~(1 << channel); | |
380 | else | |
381 | evt |= (1 << channel); | |
382 | ||
383 | if (mcu_override) | |
384 | mcu &= ~(1 << channel); | |
385 | else | |
386 | mcu |= (1 << channel); | |
387 | ||
388 | __raw_writel(evt, sdma->regs + SDMA_H_EVTOVR); | |
389 | __raw_writel(mcu, sdma->regs + SDMA_H_HOSTOVR); | |
390 | __raw_writel(dsp, sdma->regs + SDMA_H_DSPOVR); | |
391 | ||
392 | return 0; | |
393 | } | |
394 | ||
395 | /* | |
396 | * sdma_run_channel - run a channel and wait till it's done | |
397 | */ | |
398 | static int sdma_run_channel(struct sdma_channel *sdmac) | |
399 | { | |
400 | struct sdma_engine *sdma = sdmac->sdma; | |
401 | int channel = sdmac->channel; | |
402 | int ret; | |
403 | ||
404 | init_completion(&sdmac->done); | |
405 | ||
406 | __raw_writel(1 << channel, sdma->regs + SDMA_H_START); | |
407 | ||
408 | ret = wait_for_completion_timeout(&sdmac->done, HZ); | |
409 | ||
410 | return ret ? 0 : -ETIMEDOUT; | |
411 | } | |
412 | ||
413 | static int sdma_load_script(struct sdma_engine *sdma, void *buf, int size, | |
414 | u32 address) | |
415 | { | |
416 | struct sdma_buffer_descriptor *bd0 = sdma->channel[0].bd; | |
417 | void *buf_virt; | |
418 | dma_addr_t buf_phys; | |
419 | int ret; | |
420 | ||
73eab978 SH |
421 | mutex_lock(&sdma->channel_0_lock); |
422 | ||
1ec1e82f SH |
423 | buf_virt = dma_alloc_coherent(NULL, |
424 | size, | |
425 | &buf_phys, GFP_KERNEL); | |
73eab978 SH |
426 | if (!buf_virt) { |
427 | ret = -ENOMEM; | |
428 | goto err_out; | |
429 | } | |
1ec1e82f SH |
430 | |
431 | bd0->mode.command = C0_SETPM; | |
432 | bd0->mode.status = BD_DONE | BD_INTR | BD_WRAP | BD_EXTD; | |
433 | bd0->mode.count = size / 2; | |
434 | bd0->buffer_addr = buf_phys; | |
435 | bd0->ext_buffer_addr = address; | |
436 | ||
437 | memcpy(buf_virt, buf, size); | |
438 | ||
439 | ret = sdma_run_channel(&sdma->channel[0]); | |
440 | ||
441 | dma_free_coherent(NULL, size, buf_virt, buf_phys); | |
442 | ||
73eab978 SH |
443 | err_out: |
444 | mutex_unlock(&sdma->channel_0_lock); | |
445 | ||
1ec1e82f SH |
446 | return ret; |
447 | } | |
448 | ||
449 | static void sdma_event_enable(struct sdma_channel *sdmac, unsigned int event) | |
450 | { | |
451 | struct sdma_engine *sdma = sdmac->sdma; | |
452 | int channel = sdmac->channel; | |
453 | u32 val; | |
454 | u32 chnenbl = chnenbl_ofs(sdma, event); | |
455 | ||
456 | val = __raw_readl(sdma->regs + chnenbl); | |
457 | val |= (1 << channel); | |
458 | __raw_writel(val, sdma->regs + chnenbl); | |
459 | } | |
460 | ||
461 | static void sdma_event_disable(struct sdma_channel *sdmac, unsigned int event) | |
462 | { | |
463 | struct sdma_engine *sdma = sdmac->sdma; | |
464 | int channel = sdmac->channel; | |
465 | u32 chnenbl = chnenbl_ofs(sdma, event); | |
466 | u32 val; | |
467 | ||
468 | val = __raw_readl(sdma->regs + chnenbl); | |
469 | val &= ~(1 << channel); | |
470 | __raw_writel(val, sdma->regs + chnenbl); | |
471 | } | |
472 | ||
473 | static void sdma_handle_channel_loop(struct sdma_channel *sdmac) | |
474 | { | |
475 | struct sdma_buffer_descriptor *bd; | |
476 | ||
477 | /* | |
478 | * loop mode. Iterate over descriptors, re-setup them and | |
479 | * call callback function. | |
480 | */ | |
481 | while (1) { | |
482 | bd = &sdmac->bd[sdmac->buf_tail]; | |
483 | ||
484 | if (bd->mode.status & BD_DONE) | |
485 | break; | |
486 | ||
487 | if (bd->mode.status & BD_RROR) | |
488 | sdmac->status = DMA_ERROR; | |
489 | else | |
1e9cebb4 | 490 | sdmac->status = DMA_IN_PROGRESS; |
1ec1e82f SH |
491 | |
492 | bd->mode.status |= BD_DONE; | |
493 | sdmac->buf_tail++; | |
494 | sdmac->buf_tail %= sdmac->num_bd; | |
495 | ||
496 | if (sdmac->desc.callback) | |
497 | sdmac->desc.callback(sdmac->desc.callback_param); | |
498 | } | |
499 | } | |
500 | ||
501 | static void mxc_sdma_handle_channel_normal(struct sdma_channel *sdmac) | |
502 | { | |
503 | struct sdma_buffer_descriptor *bd; | |
504 | int i, error = 0; | |
505 | ||
506 | /* | |
507 | * non loop mode. Iterate over all descriptors, collect | |
508 | * errors and call callback function | |
509 | */ | |
510 | for (i = 0; i < sdmac->num_bd; i++) { | |
511 | bd = &sdmac->bd[i]; | |
512 | ||
513 | if (bd->mode.status & (BD_DONE | BD_RROR)) | |
514 | error = -EIO; | |
515 | } | |
516 | ||
517 | if (error) | |
518 | sdmac->status = DMA_ERROR; | |
519 | else | |
520 | sdmac->status = DMA_SUCCESS; | |
521 | ||
522 | if (sdmac->desc.callback) | |
523 | sdmac->desc.callback(sdmac->desc.callback_param); | |
524 | sdmac->last_completed = sdmac->desc.cookie; | |
525 | } | |
526 | ||
527 | static void mxc_sdma_handle_channel(struct sdma_channel *sdmac) | |
528 | { | |
529 | complete(&sdmac->done); | |
530 | ||
531 | /* not interested in channel 0 interrupts */ | |
532 | if (sdmac->channel == 0) | |
533 | return; | |
534 | ||
535 | if (sdmac->flags & IMX_DMA_SG_LOOP) | |
536 | sdma_handle_channel_loop(sdmac); | |
537 | else | |
538 | mxc_sdma_handle_channel_normal(sdmac); | |
539 | } | |
540 | ||
541 | static irqreturn_t sdma_int_handler(int irq, void *dev_id) | |
542 | { | |
543 | struct sdma_engine *sdma = dev_id; | |
544 | u32 stat; | |
545 | ||
546 | stat = __raw_readl(sdma->regs + SDMA_H_INTR); | |
547 | __raw_writel(stat, sdma->regs + SDMA_H_INTR); | |
548 | ||
549 | while (stat) { | |
550 | int channel = fls(stat) - 1; | |
551 | struct sdma_channel *sdmac = &sdma->channel[channel]; | |
552 | ||
553 | mxc_sdma_handle_channel(sdmac); | |
554 | ||
555 | stat &= ~(1 << channel); | |
556 | } | |
557 | ||
558 | return IRQ_HANDLED; | |
559 | } | |
560 | ||
561 | /* | |
562 | * sets the pc of SDMA script according to the peripheral type | |
563 | */ | |
564 | static void sdma_get_pc(struct sdma_channel *sdmac, | |
565 | enum sdma_peripheral_type peripheral_type) | |
566 | { | |
567 | struct sdma_engine *sdma = sdmac->sdma; | |
568 | int per_2_emi = 0, emi_2_per = 0; | |
569 | /* | |
570 | * These are needed once we start to support transfers between | |
571 | * two peripherals or memory-to-memory transfers | |
572 | */ | |
573 | int per_2_per = 0, emi_2_emi = 0; | |
574 | ||
575 | sdmac->pc_from_device = 0; | |
576 | sdmac->pc_to_device = 0; | |
577 | ||
578 | switch (peripheral_type) { | |
579 | case IMX_DMATYPE_MEMORY: | |
580 | emi_2_emi = sdma->script_addrs->ap_2_ap_addr; | |
581 | break; | |
582 | case IMX_DMATYPE_DSP: | |
583 | emi_2_per = sdma->script_addrs->bp_2_ap_addr; | |
584 | per_2_emi = sdma->script_addrs->ap_2_bp_addr; | |
585 | break; | |
586 | case IMX_DMATYPE_FIRI: | |
587 | per_2_emi = sdma->script_addrs->firi_2_mcu_addr; | |
588 | emi_2_per = sdma->script_addrs->mcu_2_firi_addr; | |
589 | break; | |
590 | case IMX_DMATYPE_UART: | |
591 | per_2_emi = sdma->script_addrs->uart_2_mcu_addr; | |
592 | emi_2_per = sdma->script_addrs->mcu_2_app_addr; | |
593 | break; | |
594 | case IMX_DMATYPE_UART_SP: | |
595 | per_2_emi = sdma->script_addrs->uartsh_2_mcu_addr; | |
596 | emi_2_per = sdma->script_addrs->mcu_2_shp_addr; | |
597 | break; | |
598 | case IMX_DMATYPE_ATA: | |
599 | per_2_emi = sdma->script_addrs->ata_2_mcu_addr; | |
600 | emi_2_per = sdma->script_addrs->mcu_2_ata_addr; | |
601 | break; | |
602 | case IMX_DMATYPE_CSPI: | |
603 | case IMX_DMATYPE_EXT: | |
604 | case IMX_DMATYPE_SSI: | |
605 | per_2_emi = sdma->script_addrs->app_2_mcu_addr; | |
606 | emi_2_per = sdma->script_addrs->mcu_2_app_addr; | |
607 | break; | |
608 | case IMX_DMATYPE_SSI_SP: | |
609 | case IMX_DMATYPE_MMC: | |
610 | case IMX_DMATYPE_SDHC: | |
611 | case IMX_DMATYPE_CSPI_SP: | |
612 | case IMX_DMATYPE_ESAI: | |
613 | case IMX_DMATYPE_MSHC_SP: | |
614 | per_2_emi = sdma->script_addrs->shp_2_mcu_addr; | |
615 | emi_2_per = sdma->script_addrs->mcu_2_shp_addr; | |
616 | break; | |
617 | case IMX_DMATYPE_ASRC: | |
618 | per_2_emi = sdma->script_addrs->asrc_2_mcu_addr; | |
619 | emi_2_per = sdma->script_addrs->asrc_2_mcu_addr; | |
620 | per_2_per = sdma->script_addrs->per_2_per_addr; | |
621 | break; | |
622 | case IMX_DMATYPE_MSHC: | |
623 | per_2_emi = sdma->script_addrs->mshc_2_mcu_addr; | |
624 | emi_2_per = sdma->script_addrs->mcu_2_mshc_addr; | |
625 | break; | |
626 | case IMX_DMATYPE_CCM: | |
627 | per_2_emi = sdma->script_addrs->dptc_dvfs_addr; | |
628 | break; | |
629 | case IMX_DMATYPE_SPDIF: | |
630 | per_2_emi = sdma->script_addrs->spdif_2_mcu_addr; | |
631 | emi_2_per = sdma->script_addrs->mcu_2_spdif_addr; | |
632 | break; | |
633 | case IMX_DMATYPE_IPU_MEMORY: | |
634 | emi_2_per = sdma->script_addrs->ext_mem_2_ipu_addr; | |
635 | break; | |
636 | default: | |
637 | break; | |
638 | } | |
639 | ||
640 | sdmac->pc_from_device = per_2_emi; | |
641 | sdmac->pc_to_device = emi_2_per; | |
642 | } | |
643 | ||
644 | static int sdma_load_context(struct sdma_channel *sdmac) | |
645 | { | |
646 | struct sdma_engine *sdma = sdmac->sdma; | |
647 | int channel = sdmac->channel; | |
648 | int load_address; | |
649 | struct sdma_context_data *context = sdma->context; | |
650 | struct sdma_buffer_descriptor *bd0 = sdma->channel[0].bd; | |
651 | int ret; | |
652 | ||
db8196df | 653 | if (sdmac->direction == DMA_DEV_TO_MEM) { |
1ec1e82f SH |
654 | load_address = sdmac->pc_from_device; |
655 | } else { | |
656 | load_address = sdmac->pc_to_device; | |
657 | } | |
658 | ||
659 | if (load_address < 0) | |
660 | return load_address; | |
661 | ||
662 | dev_dbg(sdma->dev, "load_address = %d\n", load_address); | |
663 | dev_dbg(sdma->dev, "wml = 0x%08x\n", sdmac->watermark_level); | |
664 | dev_dbg(sdma->dev, "shp_addr = 0x%08x\n", sdmac->shp_addr); | |
665 | dev_dbg(sdma->dev, "per_addr = 0x%08x\n", sdmac->per_addr); | |
666 | dev_dbg(sdma->dev, "event_mask0 = 0x%08x\n", sdmac->event_mask0); | |
667 | dev_dbg(sdma->dev, "event_mask1 = 0x%08x\n", sdmac->event_mask1); | |
668 | ||
73eab978 SH |
669 | mutex_lock(&sdma->channel_0_lock); |
670 | ||
1ec1e82f SH |
671 | memset(context, 0, sizeof(*context)); |
672 | context->channel_state.pc = load_address; | |
673 | ||
674 | /* Send by context the event mask,base address for peripheral | |
675 | * and watermark level | |
676 | */ | |
677 | context->gReg[0] = sdmac->event_mask1; | |
678 | context->gReg[1] = sdmac->event_mask0; | |
679 | context->gReg[2] = sdmac->per_addr; | |
680 | context->gReg[6] = sdmac->shp_addr; | |
681 | context->gReg[7] = sdmac->watermark_level; | |
682 | ||
683 | bd0->mode.command = C0_SETDM; | |
684 | bd0->mode.status = BD_DONE | BD_INTR | BD_WRAP | BD_EXTD; | |
685 | bd0->mode.count = sizeof(*context) / 4; | |
686 | bd0->buffer_addr = sdma->context_phys; | |
687 | bd0->ext_buffer_addr = 2048 + (sizeof(*context) / 4) * channel; | |
688 | ||
689 | ret = sdma_run_channel(&sdma->channel[0]); | |
690 | ||
73eab978 SH |
691 | mutex_unlock(&sdma->channel_0_lock); |
692 | ||
1ec1e82f SH |
693 | return ret; |
694 | } | |
695 | ||
696 | static void sdma_disable_channel(struct sdma_channel *sdmac) | |
697 | { | |
698 | struct sdma_engine *sdma = sdmac->sdma; | |
699 | int channel = sdmac->channel; | |
700 | ||
701 | __raw_writel(1 << channel, sdma->regs + SDMA_H_STATSTOP); | |
702 | sdmac->status = DMA_ERROR; | |
703 | } | |
704 | ||
705 | static int sdma_config_channel(struct sdma_channel *sdmac) | |
706 | { | |
707 | int ret; | |
708 | ||
709 | sdma_disable_channel(sdmac); | |
710 | ||
711 | sdmac->event_mask0 = 0; | |
712 | sdmac->event_mask1 = 0; | |
713 | sdmac->shp_addr = 0; | |
714 | sdmac->per_addr = 0; | |
715 | ||
716 | if (sdmac->event_id0) { | |
717 | if (sdmac->event_id0 > 32) | |
718 | return -EINVAL; | |
719 | sdma_event_enable(sdmac, sdmac->event_id0); | |
720 | } | |
721 | ||
722 | switch (sdmac->peripheral_type) { | |
723 | case IMX_DMATYPE_DSP: | |
724 | sdma_config_ownership(sdmac, false, true, true); | |
725 | break; | |
726 | case IMX_DMATYPE_MEMORY: | |
727 | sdma_config_ownership(sdmac, false, true, false); | |
728 | break; | |
729 | default: | |
730 | sdma_config_ownership(sdmac, true, true, false); | |
731 | break; | |
732 | } | |
733 | ||
734 | sdma_get_pc(sdmac, sdmac->peripheral_type); | |
735 | ||
736 | if ((sdmac->peripheral_type != IMX_DMATYPE_MEMORY) && | |
737 | (sdmac->peripheral_type != IMX_DMATYPE_DSP)) { | |
738 | /* Handle multiple event channels differently */ | |
739 | if (sdmac->event_id1) { | |
740 | sdmac->event_mask1 = 1 << (sdmac->event_id1 % 32); | |
741 | if (sdmac->event_id1 > 31) | |
742 | sdmac->watermark_level |= 1 << 31; | |
743 | sdmac->event_mask0 = 1 << (sdmac->event_id0 % 32); | |
744 | if (sdmac->event_id0 > 31) | |
745 | sdmac->watermark_level |= 1 << 30; | |
746 | } else { | |
747 | sdmac->event_mask0 = 1 << sdmac->event_id0; | |
748 | sdmac->event_mask1 = 1 << (sdmac->event_id0 - 32); | |
749 | } | |
750 | /* Watermark Level */ | |
751 | sdmac->watermark_level |= sdmac->watermark_level; | |
752 | /* Address */ | |
753 | sdmac->shp_addr = sdmac->per_address; | |
754 | } else { | |
755 | sdmac->watermark_level = 0; /* FIXME: M3_BASE_ADDRESS */ | |
756 | } | |
757 | ||
758 | ret = sdma_load_context(sdmac); | |
759 | ||
760 | return ret; | |
761 | } | |
762 | ||
763 | static int sdma_set_channel_priority(struct sdma_channel *sdmac, | |
764 | unsigned int priority) | |
765 | { | |
766 | struct sdma_engine *sdma = sdmac->sdma; | |
767 | int channel = sdmac->channel; | |
768 | ||
769 | if (priority < MXC_SDMA_MIN_PRIORITY | |
770 | || priority > MXC_SDMA_MAX_PRIORITY) { | |
771 | return -EINVAL; | |
772 | } | |
773 | ||
774 | __raw_writel(priority, sdma->regs + SDMA_CHNPRI_0 + 4 * channel); | |
775 | ||
776 | return 0; | |
777 | } | |
778 | ||
779 | static int sdma_request_channel(struct sdma_channel *sdmac) | |
780 | { | |
781 | struct sdma_engine *sdma = sdmac->sdma; | |
782 | int channel = sdmac->channel; | |
783 | int ret = -EBUSY; | |
784 | ||
785 | sdmac->bd = dma_alloc_coherent(NULL, PAGE_SIZE, &sdmac->bd_phys, GFP_KERNEL); | |
786 | if (!sdmac->bd) { | |
787 | ret = -ENOMEM; | |
788 | goto out; | |
789 | } | |
790 | ||
791 | memset(sdmac->bd, 0, PAGE_SIZE); | |
792 | ||
793 | sdma->channel_control[channel].base_bd_ptr = sdmac->bd_phys; | |
794 | sdma->channel_control[channel].current_bd_ptr = sdmac->bd_phys; | |
795 | ||
796 | clk_enable(sdma->clk); | |
797 | ||
798 | sdma_set_channel_priority(sdmac, MXC_SDMA_DEFAULT_PRIORITY); | |
799 | ||
800 | init_completion(&sdmac->done); | |
801 | ||
802 | sdmac->buf_tail = 0; | |
803 | ||
804 | return 0; | |
805 | out: | |
806 | ||
807 | return ret; | |
808 | } | |
809 | ||
810 | static void sdma_enable_channel(struct sdma_engine *sdma, int channel) | |
811 | { | |
812 | __raw_writel(1 << channel, sdma->regs + SDMA_H_START); | |
813 | } | |
814 | ||
d718f4eb | 815 | static dma_cookie_t sdma_assign_cookie(struct sdma_channel *sdmac) |
1ec1e82f | 816 | { |
d718f4eb | 817 | dma_cookie_t cookie = sdmac->chan.cookie; |
1ec1e82f SH |
818 | |
819 | if (++cookie < 0) | |
820 | cookie = 1; | |
821 | ||
d718f4eb SG |
822 | sdmac->chan.cookie = cookie; |
823 | sdmac->desc.cookie = cookie; | |
1ec1e82f SH |
824 | |
825 | return cookie; | |
826 | } | |
827 | ||
828 | static struct sdma_channel *to_sdma_chan(struct dma_chan *chan) | |
829 | { | |
830 | return container_of(chan, struct sdma_channel, chan); | |
831 | } | |
832 | ||
833 | static dma_cookie_t sdma_tx_submit(struct dma_async_tx_descriptor *tx) | |
834 | { | |
835 | struct sdma_channel *sdmac = to_sdma_chan(tx->chan); | |
836 | struct sdma_engine *sdma = sdmac->sdma; | |
837 | dma_cookie_t cookie; | |
838 | ||
839 | spin_lock_irq(&sdmac->lock); | |
840 | ||
841 | cookie = sdma_assign_cookie(sdmac); | |
842 | ||
23889c63 | 843 | sdma_enable_channel(sdma, sdmac->channel); |
1ec1e82f SH |
844 | |
845 | spin_unlock_irq(&sdmac->lock); | |
846 | ||
847 | return cookie; | |
848 | } | |
849 | ||
850 | static int sdma_alloc_chan_resources(struct dma_chan *chan) | |
851 | { | |
852 | struct sdma_channel *sdmac = to_sdma_chan(chan); | |
853 | struct imx_dma_data *data = chan->private; | |
854 | int prio, ret; | |
855 | ||
1ec1e82f SH |
856 | if (!data) |
857 | return -EINVAL; | |
858 | ||
859 | switch (data->priority) { | |
860 | case DMA_PRIO_HIGH: | |
861 | prio = 3; | |
862 | break; | |
863 | case DMA_PRIO_MEDIUM: | |
864 | prio = 2; | |
865 | break; | |
866 | case DMA_PRIO_LOW: | |
867 | default: | |
868 | prio = 1; | |
869 | break; | |
870 | } | |
871 | ||
872 | sdmac->peripheral_type = data->peripheral_type; | |
873 | sdmac->event_id0 = data->dma_request; | |
874 | ret = sdma_set_channel_priority(sdmac, prio); | |
875 | if (ret) | |
876 | return ret; | |
877 | ||
878 | ret = sdma_request_channel(sdmac); | |
879 | if (ret) | |
880 | return ret; | |
881 | ||
882 | dma_async_tx_descriptor_init(&sdmac->desc, chan); | |
883 | sdmac->desc.tx_submit = sdma_tx_submit; | |
884 | /* txd.flags will be overwritten in prep funcs */ | |
885 | sdmac->desc.flags = DMA_CTRL_ACK; | |
886 | ||
887 | return 0; | |
888 | } | |
889 | ||
890 | static void sdma_free_chan_resources(struct dma_chan *chan) | |
891 | { | |
892 | struct sdma_channel *sdmac = to_sdma_chan(chan); | |
893 | struct sdma_engine *sdma = sdmac->sdma; | |
894 | ||
895 | sdma_disable_channel(sdmac); | |
896 | ||
897 | if (sdmac->event_id0) | |
898 | sdma_event_disable(sdmac, sdmac->event_id0); | |
899 | if (sdmac->event_id1) | |
900 | sdma_event_disable(sdmac, sdmac->event_id1); | |
901 | ||
902 | sdmac->event_id0 = 0; | |
903 | sdmac->event_id1 = 0; | |
904 | ||
905 | sdma_set_channel_priority(sdmac, 0); | |
906 | ||
907 | dma_free_coherent(NULL, PAGE_SIZE, sdmac->bd, sdmac->bd_phys); | |
908 | ||
909 | clk_disable(sdma->clk); | |
910 | } | |
911 | ||
912 | static struct dma_async_tx_descriptor *sdma_prep_slave_sg( | |
913 | struct dma_chan *chan, struct scatterlist *sgl, | |
db8196df | 914 | unsigned int sg_len, enum dma_transfer_direction direction, |
1ec1e82f SH |
915 | unsigned long flags) |
916 | { | |
917 | struct sdma_channel *sdmac = to_sdma_chan(chan); | |
918 | struct sdma_engine *sdma = sdmac->sdma; | |
919 | int ret, i, count; | |
23889c63 | 920 | int channel = sdmac->channel; |
1ec1e82f SH |
921 | struct scatterlist *sg; |
922 | ||
923 | if (sdmac->status == DMA_IN_PROGRESS) | |
924 | return NULL; | |
925 | sdmac->status = DMA_IN_PROGRESS; | |
926 | ||
927 | sdmac->flags = 0; | |
928 | ||
929 | dev_dbg(sdma->dev, "setting up %d entries for channel %d.\n", | |
930 | sg_len, channel); | |
931 | ||
932 | sdmac->direction = direction; | |
933 | ret = sdma_load_context(sdmac); | |
934 | if (ret) | |
935 | goto err_out; | |
936 | ||
937 | if (sg_len > NUM_BD) { | |
938 | dev_err(sdma->dev, "SDMA channel %d: maximum number of sg exceeded: %d > %d\n", | |
939 | channel, sg_len, NUM_BD); | |
940 | ret = -EINVAL; | |
941 | goto err_out; | |
942 | } | |
943 | ||
944 | for_each_sg(sgl, sg, sg_len, i) { | |
945 | struct sdma_buffer_descriptor *bd = &sdmac->bd[i]; | |
946 | int param; | |
947 | ||
d2f5c276 | 948 | bd->buffer_addr = sg->dma_address; |
1ec1e82f SH |
949 | |
950 | count = sg->length; | |
951 | ||
952 | if (count > 0xffff) { | |
953 | dev_err(sdma->dev, "SDMA channel %d: maximum bytes for sg entry exceeded: %d > %d\n", | |
954 | channel, count, 0xffff); | |
955 | ret = -EINVAL; | |
956 | goto err_out; | |
957 | } | |
958 | ||
959 | bd->mode.count = count; | |
960 | ||
961 | if (sdmac->word_size > DMA_SLAVE_BUSWIDTH_4_BYTES) { | |
962 | ret = -EINVAL; | |
963 | goto err_out; | |
964 | } | |
1fa81c27 SH |
965 | |
966 | switch (sdmac->word_size) { | |
967 | case DMA_SLAVE_BUSWIDTH_4_BYTES: | |
1ec1e82f | 968 | bd->mode.command = 0; |
1fa81c27 SH |
969 | if (count & 3 || sg->dma_address & 3) |
970 | return NULL; | |
971 | break; | |
972 | case DMA_SLAVE_BUSWIDTH_2_BYTES: | |
973 | bd->mode.command = 2; | |
974 | if (count & 1 || sg->dma_address & 1) | |
975 | return NULL; | |
976 | break; | |
977 | case DMA_SLAVE_BUSWIDTH_1_BYTE: | |
978 | bd->mode.command = 1; | |
979 | break; | |
980 | default: | |
981 | return NULL; | |
982 | } | |
1ec1e82f SH |
983 | |
984 | param = BD_DONE | BD_EXTD | BD_CONT; | |
985 | ||
341b9419 | 986 | if (i + 1 == sg_len) { |
1ec1e82f | 987 | param |= BD_INTR; |
341b9419 SG |
988 | param |= BD_LAST; |
989 | param &= ~BD_CONT; | |
1ec1e82f SH |
990 | } |
991 | ||
1ec1e82f SH |
992 | dev_dbg(sdma->dev, "entry %d: count: %d dma: 0x%08x %s%s\n", |
993 | i, count, sg->dma_address, | |
994 | param & BD_WRAP ? "wrap" : "", | |
995 | param & BD_INTR ? " intr" : ""); | |
996 | ||
997 | bd->mode.status = param; | |
998 | } | |
999 | ||
1000 | sdmac->num_bd = sg_len; | |
1001 | sdma->channel_control[channel].current_bd_ptr = sdmac->bd_phys; | |
1002 | ||
1003 | return &sdmac->desc; | |
1004 | err_out: | |
4b2ce9dd | 1005 | sdmac->status = DMA_ERROR; |
1ec1e82f SH |
1006 | return NULL; |
1007 | } | |
1008 | ||
1009 | static struct dma_async_tx_descriptor *sdma_prep_dma_cyclic( | |
1010 | struct dma_chan *chan, dma_addr_t dma_addr, size_t buf_len, | |
db8196df | 1011 | size_t period_len, enum dma_transfer_direction direction) |
1ec1e82f SH |
1012 | { |
1013 | struct sdma_channel *sdmac = to_sdma_chan(chan); | |
1014 | struct sdma_engine *sdma = sdmac->sdma; | |
1015 | int num_periods = buf_len / period_len; | |
23889c63 | 1016 | int channel = sdmac->channel; |
1ec1e82f SH |
1017 | int ret, i = 0, buf = 0; |
1018 | ||
1019 | dev_dbg(sdma->dev, "%s channel: %d\n", __func__, channel); | |
1020 | ||
1021 | if (sdmac->status == DMA_IN_PROGRESS) | |
1022 | return NULL; | |
1023 | ||
1024 | sdmac->status = DMA_IN_PROGRESS; | |
1025 | ||
1026 | sdmac->flags |= IMX_DMA_SG_LOOP; | |
1027 | sdmac->direction = direction; | |
1028 | ret = sdma_load_context(sdmac); | |
1029 | if (ret) | |
1030 | goto err_out; | |
1031 | ||
1032 | if (num_periods > NUM_BD) { | |
1033 | dev_err(sdma->dev, "SDMA channel %d: maximum number of sg exceeded: %d > %d\n", | |
1034 | channel, num_periods, NUM_BD); | |
1035 | goto err_out; | |
1036 | } | |
1037 | ||
1038 | if (period_len > 0xffff) { | |
1039 | dev_err(sdma->dev, "SDMA channel %d: maximum period size exceeded: %d > %d\n", | |
1040 | channel, period_len, 0xffff); | |
1041 | goto err_out; | |
1042 | } | |
1043 | ||
1044 | while (buf < buf_len) { | |
1045 | struct sdma_buffer_descriptor *bd = &sdmac->bd[i]; | |
1046 | int param; | |
1047 | ||
1048 | bd->buffer_addr = dma_addr; | |
1049 | ||
1050 | bd->mode.count = period_len; | |
1051 | ||
1052 | if (sdmac->word_size > DMA_SLAVE_BUSWIDTH_4_BYTES) | |
1053 | goto err_out; | |
1054 | if (sdmac->word_size == DMA_SLAVE_BUSWIDTH_4_BYTES) | |
1055 | bd->mode.command = 0; | |
1056 | else | |
1057 | bd->mode.command = sdmac->word_size; | |
1058 | ||
1059 | param = BD_DONE | BD_EXTD | BD_CONT | BD_INTR; | |
1060 | if (i + 1 == num_periods) | |
1061 | param |= BD_WRAP; | |
1062 | ||
1063 | dev_dbg(sdma->dev, "entry %d: count: %d dma: 0x%08x %s%s\n", | |
1064 | i, period_len, dma_addr, | |
1065 | param & BD_WRAP ? "wrap" : "", | |
1066 | param & BD_INTR ? " intr" : ""); | |
1067 | ||
1068 | bd->mode.status = param; | |
1069 | ||
1070 | dma_addr += period_len; | |
1071 | buf += period_len; | |
1072 | ||
1073 | i++; | |
1074 | } | |
1075 | ||
1076 | sdmac->num_bd = num_periods; | |
1077 | sdma->channel_control[channel].current_bd_ptr = sdmac->bd_phys; | |
1078 | ||
1079 | return &sdmac->desc; | |
1080 | err_out: | |
1081 | sdmac->status = DMA_ERROR; | |
1082 | return NULL; | |
1083 | } | |
1084 | ||
1085 | static int sdma_control(struct dma_chan *chan, enum dma_ctrl_cmd cmd, | |
1086 | unsigned long arg) | |
1087 | { | |
1088 | struct sdma_channel *sdmac = to_sdma_chan(chan); | |
1089 | struct dma_slave_config *dmaengine_cfg = (void *)arg; | |
1090 | ||
1091 | switch (cmd) { | |
1092 | case DMA_TERMINATE_ALL: | |
1093 | sdma_disable_channel(sdmac); | |
1094 | return 0; | |
1095 | case DMA_SLAVE_CONFIG: | |
db8196df | 1096 | if (dmaengine_cfg->direction == DMA_DEV_TO_MEM) { |
1ec1e82f SH |
1097 | sdmac->per_address = dmaengine_cfg->src_addr; |
1098 | sdmac->watermark_level = dmaengine_cfg->src_maxburst; | |
1099 | sdmac->word_size = dmaengine_cfg->src_addr_width; | |
1100 | } else { | |
1101 | sdmac->per_address = dmaengine_cfg->dst_addr; | |
1102 | sdmac->watermark_level = dmaengine_cfg->dst_maxburst; | |
1103 | sdmac->word_size = dmaengine_cfg->dst_addr_width; | |
1104 | } | |
1105 | return sdma_config_channel(sdmac); | |
1106 | default: | |
1107 | return -ENOSYS; | |
1108 | } | |
1109 | ||
1110 | return -EINVAL; | |
1111 | } | |
1112 | ||
1113 | static enum dma_status sdma_tx_status(struct dma_chan *chan, | |
1114 | dma_cookie_t cookie, | |
1115 | struct dma_tx_state *txstate) | |
1116 | { | |
1117 | struct sdma_channel *sdmac = to_sdma_chan(chan); | |
1118 | dma_cookie_t last_used; | |
1ec1e82f SH |
1119 | |
1120 | last_used = chan->cookie; | |
1121 | ||
1ec1e82f SH |
1122 | dma_set_tx_state(txstate, sdmac->last_completed, last_used, 0); |
1123 | ||
8a965911 | 1124 | return sdmac->status; |
1ec1e82f SH |
1125 | } |
1126 | ||
1127 | static void sdma_issue_pending(struct dma_chan *chan) | |
1128 | { | |
1129 | /* | |
1130 | * Nothing to do. We only have a single descriptor | |
1131 | */ | |
1132 | } | |
1133 | ||
5b28aa31 SH |
1134 | #define SDMA_SCRIPT_ADDRS_ARRAY_SIZE_V1 34 |
1135 | ||
1136 | static void sdma_add_scripts(struct sdma_engine *sdma, | |
1137 | const struct sdma_script_start_addrs *addr) | |
1138 | { | |
1139 | s32 *addr_arr = (u32 *)addr; | |
1140 | s32 *saddr_arr = (u32 *)sdma->script_addrs; | |
1141 | int i; | |
1142 | ||
1143 | for (i = 0; i < SDMA_SCRIPT_ADDRS_ARRAY_SIZE_V1; i++) | |
1144 | if (addr_arr[i] > 0) | |
1145 | saddr_arr[i] = addr_arr[i]; | |
1146 | } | |
1147 | ||
7b4b88e0 | 1148 | static void sdma_load_firmware(const struct firmware *fw, void *context) |
5b28aa31 | 1149 | { |
7b4b88e0 | 1150 | struct sdma_engine *sdma = context; |
5b28aa31 | 1151 | const struct sdma_firmware_header *header; |
5b28aa31 SH |
1152 | const struct sdma_script_start_addrs *addr; |
1153 | unsigned short *ram_code; | |
1154 | ||
7b4b88e0 SH |
1155 | if (!fw) { |
1156 | dev_err(sdma->dev, "firmware not found\n"); | |
1157 | return; | |
1158 | } | |
5b28aa31 SH |
1159 | |
1160 | if (fw->size < sizeof(*header)) | |
1161 | goto err_firmware; | |
1162 | ||
1163 | header = (struct sdma_firmware_header *)fw->data; | |
1164 | ||
1165 | if (header->magic != SDMA_FIRMWARE_MAGIC) | |
1166 | goto err_firmware; | |
1167 | if (header->ram_code_start + header->ram_code_size > fw->size) | |
1168 | goto err_firmware; | |
1169 | ||
1170 | addr = (void *)header + header->script_addrs_start; | |
1171 | ram_code = (void *)header + header->ram_code_start; | |
1172 | ||
1173 | clk_enable(sdma->clk); | |
1174 | /* download the RAM image for SDMA */ | |
1175 | sdma_load_script(sdma, ram_code, | |
1176 | header->ram_code_size, | |
6866fd3b | 1177 | addr->ram_code_start_addr); |
5b28aa31 SH |
1178 | clk_disable(sdma->clk); |
1179 | ||
1180 | sdma_add_scripts(sdma, addr); | |
1181 | ||
1182 | dev_info(sdma->dev, "loaded firmware %d.%d\n", | |
1183 | header->version_major, | |
1184 | header->version_minor); | |
1185 | ||
1186 | err_firmware: | |
1187 | release_firmware(fw); | |
7b4b88e0 SH |
1188 | } |
1189 | ||
1190 | static int __init sdma_get_firmware(struct sdma_engine *sdma, | |
1191 | const char *fw_name) | |
1192 | { | |
1193 | int ret; | |
1194 | ||
1195 | ret = request_firmware_nowait(THIS_MODULE, | |
1196 | FW_ACTION_HOTPLUG, fw_name, sdma->dev, | |
1197 | GFP_KERNEL, sdma, sdma_load_firmware); | |
5b28aa31 SH |
1198 | |
1199 | return ret; | |
1200 | } | |
1201 | ||
1202 | static int __init sdma_init(struct sdma_engine *sdma) | |
1ec1e82f SH |
1203 | { |
1204 | int i, ret; | |
1205 | dma_addr_t ccb_phys; | |
1206 | ||
62550cd7 SG |
1207 | switch (sdma->devtype) { |
1208 | case IMX31_SDMA: | |
1ec1e82f SH |
1209 | sdma->num_events = 32; |
1210 | break; | |
62550cd7 | 1211 | case IMX35_SDMA: |
1ec1e82f SH |
1212 | sdma->num_events = 48; |
1213 | break; | |
1214 | default: | |
62550cd7 SG |
1215 | dev_err(sdma->dev, "Unknown sdma type %d. aborting\n", |
1216 | sdma->devtype); | |
1ec1e82f SH |
1217 | return -ENODEV; |
1218 | } | |
1219 | ||
1220 | clk_enable(sdma->clk); | |
1221 | ||
1222 | /* Be sure SDMA has not started yet */ | |
1223 | __raw_writel(0, sdma->regs + SDMA_H_C0PTR); | |
1224 | ||
1225 | sdma->channel_control = dma_alloc_coherent(NULL, | |
1226 | MAX_DMA_CHANNELS * sizeof (struct sdma_channel_control) + | |
1227 | sizeof(struct sdma_context_data), | |
1228 | &ccb_phys, GFP_KERNEL); | |
1229 | ||
1230 | if (!sdma->channel_control) { | |
1231 | ret = -ENOMEM; | |
1232 | goto err_dma_alloc; | |
1233 | } | |
1234 | ||
1235 | sdma->context = (void *)sdma->channel_control + | |
1236 | MAX_DMA_CHANNELS * sizeof (struct sdma_channel_control); | |
1237 | sdma->context_phys = ccb_phys + | |
1238 | MAX_DMA_CHANNELS * sizeof (struct sdma_channel_control); | |
1239 | ||
1240 | /* Zero-out the CCB structures array just allocated */ | |
1241 | memset(sdma->channel_control, 0, | |
1242 | MAX_DMA_CHANNELS * sizeof (struct sdma_channel_control)); | |
1243 | ||
1244 | /* disable all channels */ | |
1245 | for (i = 0; i < sdma->num_events; i++) | |
1246 | __raw_writel(0, sdma->regs + chnenbl_ofs(sdma, i)); | |
1247 | ||
1248 | /* All channels have priority 0 */ | |
1249 | for (i = 0; i < MAX_DMA_CHANNELS; i++) | |
1250 | __raw_writel(0, sdma->regs + SDMA_CHNPRI_0 + i * 4); | |
1251 | ||
1252 | ret = sdma_request_channel(&sdma->channel[0]); | |
1253 | if (ret) | |
1254 | goto err_dma_alloc; | |
1255 | ||
1256 | sdma_config_ownership(&sdma->channel[0], false, true, false); | |
1257 | ||
1258 | /* Set Command Channel (Channel Zero) */ | |
1259 | __raw_writel(0x4050, sdma->regs + SDMA_CHN0ADDR); | |
1260 | ||
1261 | /* Set bits of CONFIG register but with static context switching */ | |
1262 | /* FIXME: Check whether to set ACR bit depending on clock ratios */ | |
1263 | __raw_writel(0, sdma->regs + SDMA_H_CONFIG); | |
1264 | ||
1265 | __raw_writel(ccb_phys, sdma->regs + SDMA_H_C0PTR); | |
1266 | ||
1ec1e82f SH |
1267 | /* Set bits of CONFIG register with given context switching mode */ |
1268 | __raw_writel(SDMA_H_CONFIG_CSM, sdma->regs + SDMA_H_CONFIG); | |
1269 | ||
1270 | /* Initializes channel's priorities */ | |
1271 | sdma_set_channel_priority(&sdma->channel[0], 7); | |
1272 | ||
1273 | clk_disable(sdma->clk); | |
1274 | ||
1275 | return 0; | |
1276 | ||
1277 | err_dma_alloc: | |
1278 | clk_disable(sdma->clk); | |
1279 | dev_err(sdma->dev, "initialisation failed with %d\n", ret); | |
1280 | return ret; | |
1281 | } | |
1282 | ||
1283 | static int __init sdma_probe(struct platform_device *pdev) | |
1284 | { | |
580975d7 SG |
1285 | const struct of_device_id *of_id = |
1286 | of_match_device(sdma_dt_ids, &pdev->dev); | |
1287 | struct device_node *np = pdev->dev.of_node; | |
1288 | const char *fw_name; | |
1ec1e82f | 1289 | int ret; |
1ec1e82f | 1290 | int irq; |
1ec1e82f SH |
1291 | struct resource *iores; |
1292 | struct sdma_platform_data *pdata = pdev->dev.platform_data; | |
1ec1e82f | 1293 | int i; |
1ec1e82f | 1294 | struct sdma_engine *sdma; |
36e2f21a | 1295 | s32 *saddr_arr; |
1ec1e82f SH |
1296 | |
1297 | sdma = kzalloc(sizeof(*sdma), GFP_KERNEL); | |
1298 | if (!sdma) | |
1299 | return -ENOMEM; | |
1300 | ||
73eab978 SH |
1301 | mutex_init(&sdma->channel_0_lock); |
1302 | ||
1ec1e82f SH |
1303 | sdma->dev = &pdev->dev; |
1304 | ||
1305 | iores = platform_get_resource(pdev, IORESOURCE_MEM, 0); | |
1306 | irq = platform_get_irq(pdev, 0); | |
580975d7 | 1307 | if (!iores || irq < 0) { |
1ec1e82f SH |
1308 | ret = -EINVAL; |
1309 | goto err_irq; | |
1310 | } | |
1311 | ||
1312 | if (!request_mem_region(iores->start, resource_size(iores), pdev->name)) { | |
1313 | ret = -EBUSY; | |
1314 | goto err_request_region; | |
1315 | } | |
1316 | ||
1317 | sdma->clk = clk_get(&pdev->dev, NULL); | |
1318 | if (IS_ERR(sdma->clk)) { | |
1319 | ret = PTR_ERR(sdma->clk); | |
1320 | goto err_clk; | |
1321 | } | |
1322 | ||
1323 | sdma->regs = ioremap(iores->start, resource_size(iores)); | |
1324 | if (!sdma->regs) { | |
1325 | ret = -ENOMEM; | |
1326 | goto err_ioremap; | |
1327 | } | |
1328 | ||
1329 | ret = request_irq(irq, sdma_int_handler, 0, "sdma", sdma); | |
1330 | if (ret) | |
1331 | goto err_request_irq; | |
1332 | ||
5b28aa31 | 1333 | sdma->script_addrs = kzalloc(sizeof(*sdma->script_addrs), GFP_KERNEL); |
1c1d9547 AL |
1334 | if (!sdma->script_addrs) { |
1335 | ret = -ENOMEM; | |
5b28aa31 | 1336 | goto err_alloc; |
1c1d9547 | 1337 | } |
1ec1e82f | 1338 | |
36e2f21a SH |
1339 | /* initially no scripts available */ |
1340 | saddr_arr = (s32 *)sdma->script_addrs; | |
1341 | for (i = 0; i < SDMA_SCRIPT_ADDRS_ARRAY_SIZE_V1; i++) | |
1342 | saddr_arr[i] = -EINVAL; | |
1343 | ||
580975d7 SG |
1344 | if (of_id) |
1345 | pdev->id_entry = of_id->data; | |
62550cd7 | 1346 | sdma->devtype = pdev->id_entry->driver_data; |
1ec1e82f | 1347 | |
7214a8b1 SH |
1348 | dma_cap_set(DMA_SLAVE, sdma->dma_device.cap_mask); |
1349 | dma_cap_set(DMA_CYCLIC, sdma->dma_device.cap_mask); | |
1350 | ||
1ec1e82f SH |
1351 | INIT_LIST_HEAD(&sdma->dma_device.channels); |
1352 | /* Initialize channel parameters */ | |
1353 | for (i = 0; i < MAX_DMA_CHANNELS; i++) { | |
1354 | struct sdma_channel *sdmac = &sdma->channel[i]; | |
1355 | ||
1356 | sdmac->sdma = sdma; | |
1357 | spin_lock_init(&sdmac->lock); | |
1358 | ||
1ec1e82f | 1359 | sdmac->chan.device = &sdma->dma_device; |
1ec1e82f SH |
1360 | sdmac->channel = i; |
1361 | ||
23889c63 SH |
1362 | /* |
1363 | * Add the channel to the DMAC list. Do not add channel 0 though | |
1364 | * because we need it internally in the SDMA driver. This also means | |
1365 | * that channel 0 in dmaengine counting matches sdma channel 1. | |
1366 | */ | |
1367 | if (i) | |
1368 | list_add_tail(&sdmac->chan.device_node, | |
1369 | &sdma->dma_device.channels); | |
1ec1e82f SH |
1370 | } |
1371 | ||
5b28aa31 | 1372 | ret = sdma_init(sdma); |
1ec1e82f SH |
1373 | if (ret) |
1374 | goto err_init; | |
1375 | ||
580975d7 | 1376 | if (pdata && pdata->script_addrs) |
5b28aa31 SH |
1377 | sdma_add_scripts(sdma, pdata->script_addrs); |
1378 | ||
580975d7 SG |
1379 | if (pdata) { |
1380 | sdma_get_firmware(sdma, pdata->fw_name); | |
1381 | } else { | |
1382 | /* | |
1383 | * Because that device tree does not encode ROM script address, | |
1384 | * the RAM script in firmware is mandatory for device tree | |
1385 | * probe, otherwise it fails. | |
1386 | */ | |
1387 | ret = of_property_read_string(np, "fsl,sdma-ram-script-name", | |
1388 | &fw_name); | |
1389 | if (ret) { | |
1390 | dev_err(&pdev->dev, "failed to get firmware name\n"); | |
1391 | goto err_init; | |
1392 | } | |
1393 | ||
1394 | ret = sdma_get_firmware(sdma, fw_name); | |
1395 | if (ret) { | |
1396 | dev_err(&pdev->dev, "failed to get firmware\n"); | |
1397 | goto err_init; | |
1398 | } | |
1399 | } | |
5b28aa31 | 1400 | |
1ec1e82f SH |
1401 | sdma->dma_device.dev = &pdev->dev; |
1402 | ||
1403 | sdma->dma_device.device_alloc_chan_resources = sdma_alloc_chan_resources; | |
1404 | sdma->dma_device.device_free_chan_resources = sdma_free_chan_resources; | |
1405 | sdma->dma_device.device_tx_status = sdma_tx_status; | |
1406 | sdma->dma_device.device_prep_slave_sg = sdma_prep_slave_sg; | |
1407 | sdma->dma_device.device_prep_dma_cyclic = sdma_prep_dma_cyclic; | |
1408 | sdma->dma_device.device_control = sdma_control; | |
1409 | sdma->dma_device.device_issue_pending = sdma_issue_pending; | |
b9b3f82f SH |
1410 | sdma->dma_device.dev->dma_parms = &sdma->dma_parms; |
1411 | dma_set_max_seg_size(sdma->dma_device.dev, 65535); | |
1ec1e82f SH |
1412 | |
1413 | ret = dma_async_device_register(&sdma->dma_device); | |
1414 | if (ret) { | |
1415 | dev_err(&pdev->dev, "unable to register\n"); | |
1416 | goto err_init; | |
1417 | } | |
1418 | ||
5b28aa31 | 1419 | dev_info(sdma->dev, "initialized\n"); |
1ec1e82f SH |
1420 | |
1421 | return 0; | |
1422 | ||
1423 | err_init: | |
1424 | kfree(sdma->script_addrs); | |
5b28aa31 | 1425 | err_alloc: |
1ec1e82f SH |
1426 | free_irq(irq, sdma); |
1427 | err_request_irq: | |
1428 | iounmap(sdma->regs); | |
1429 | err_ioremap: | |
1430 | clk_put(sdma->clk); | |
1431 | err_clk: | |
1432 | release_mem_region(iores->start, resource_size(iores)); | |
1433 | err_request_region: | |
1434 | err_irq: | |
1435 | kfree(sdma); | |
939fd4f0 | 1436 | return ret; |
1ec1e82f SH |
1437 | } |
1438 | ||
1439 | static int __exit sdma_remove(struct platform_device *pdev) | |
1440 | { | |
1441 | return -EBUSY; | |
1442 | } | |
1443 | ||
1444 | static struct platform_driver sdma_driver = { | |
1445 | .driver = { | |
1446 | .name = "imx-sdma", | |
580975d7 | 1447 | .of_match_table = sdma_dt_ids, |
1ec1e82f | 1448 | }, |
62550cd7 | 1449 | .id_table = sdma_devtypes, |
1ec1e82f SH |
1450 | .remove = __exit_p(sdma_remove), |
1451 | }; | |
1452 | ||
1453 | static int __init sdma_module_init(void) | |
1454 | { | |
1455 | return platform_driver_probe(&sdma_driver, sdma_probe); | |
1456 | } | |
c989a7fc | 1457 | module_init(sdma_module_init); |
1ec1e82f SH |
1458 | |
1459 | MODULE_AUTHOR("Sascha Hauer, Pengutronix <s.hauer@pengutronix.de>"); | |
1460 | MODULE_DESCRIPTION("i.MX SDMA driver"); | |
1461 | MODULE_LICENSE("GPL"); |