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Linux 2.6.17.7
[linux/fpc-iii.git] / drivers / mmc / imxmmc.c
bloba4eb1d0e7a7169e381847c978c71b7bcb4dd72f1
1 /*
2 * linux/drivers/mmc/imxmmc.c - Motorola i.MX MMCI driver
3 *
4 * Copyright (C) 2004 Sascha Hauer, Pengutronix <sascha@saschahauer.de>
5 * Copyright (C) 2006 Pavel Pisa, PiKRON <ppisa@pikron.com>
6 *
7 * derived from pxamci.c by Russell King
8 *
9 * This program is free software; you can redistribute it and/or modify
10 * it under the terms of the GNU General Public License version 2 as
11 * published by the Free Software Foundation.
12 *
13 * 2005-04-17 Pavel Pisa <pisa@cmp.felk.cvut.cz>
14 * Changed to conform redesigned i.MX scatter gather DMA interface
15 *
16 * 2005-11-04 Pavel Pisa <pisa@cmp.felk.cvut.cz>
17 * Updated for 2.6.14 kernel
18 *
19 * 2005-12-13 Jay Monkman <jtm@smoothsmoothie.com>
20 * Found and corrected problems in the write path
21 *
22 * 2005-12-30 Pavel Pisa <pisa@cmp.felk.cvut.cz>
23 * The event handling rewritten right way in softirq.
24 * Added many ugly hacks and delays to overcome SDHC
25 * deficiencies
26 *
27 */
28 #include <linux/config.h>
29
30 #ifdef CONFIG_MMC_DEBUG
31 #define DEBUG
32 #else
33 #undef DEBUG
34 #endif
35
36 #include <linux/module.h>
37 #include <linux/init.h>
38 #include <linux/ioport.h>
39 #include <linux/platform_device.h>
40 #include <linux/interrupt.h>
41 #include <linux/blkdev.h>
42 #include <linux/dma-mapping.h>
43 #include <linux/mmc/host.h>
44 #include <linux/mmc/card.h>
45 #include <linux/mmc/protocol.h>
46 #include <linux/delay.h>
47
48 #include <asm/dma.h>
49 #include <asm/io.h>
50 #include <asm/irq.h>
51 #include <asm/sizes.h>
52 #include <asm/arch/mmc.h>
53 #include <asm/arch/imx-dma.h>
54
55 #include "imxmmc.h"
56
57 #define DRIVER_NAME "imx-mmc"
58
59 #define IMXMCI_INT_MASK_DEFAULT (INT_MASK_BUF_READY | INT_MASK_DATA_TRAN | \
60 INT_MASK_WRITE_OP_DONE | INT_MASK_END_CMD_RES | \
61 INT_MASK_AUTO_CARD_DETECT | INT_MASK_DAT0_EN | INT_MASK_SDIO)
62
63 struct imxmci_host {
64 struct mmc_host *mmc;
65 spinlock_t lock;
66 struct resource *res;
67 int irq;
68 imx_dmach_t dma;
69 unsigned int clkrt;
70 unsigned int cmdat;
71 volatile unsigned int imask;
72 unsigned int power_mode;
73 unsigned int present;
74 struct imxmmc_platform_data *pdata;
75
76 struct mmc_request *req;
77 struct mmc_command *cmd;
78 struct mmc_data *data;
79
80 struct timer_list timer;
81 struct tasklet_struct tasklet;
82 unsigned int status_reg;
83 unsigned long pending_events;
84 /* Next to fields are there for CPU driven transfers to overcome SDHC deficiencies */
85 u16 *data_ptr;
86 unsigned int data_cnt;
87 atomic_t stuck_timeout;
88
89 unsigned int dma_nents;
90 unsigned int dma_size;
91 unsigned int dma_dir;
92 int dma_allocated;
93
94 unsigned char actual_bus_width;
95 };
96
97 #define IMXMCI_PEND_IRQ_b 0
98 #define IMXMCI_PEND_DMA_END_b 1
99 #define IMXMCI_PEND_DMA_ERR_b 2
100 #define IMXMCI_PEND_WAIT_RESP_b 3
101 #define IMXMCI_PEND_DMA_DATA_b 4
102 #define IMXMCI_PEND_CPU_DATA_b 5
103 #define IMXMCI_PEND_CARD_XCHG_b 6
104 #define IMXMCI_PEND_SET_INIT_b 7
105 #define IMXMCI_PEND_STARTED_b 8
106
107 #define IMXMCI_PEND_IRQ_m (1 << IMXMCI_PEND_IRQ_b)
108 #define IMXMCI_PEND_DMA_END_m (1 << IMXMCI_PEND_DMA_END_b)
109 #define IMXMCI_PEND_DMA_ERR_m (1 << IMXMCI_PEND_DMA_ERR_b)
110 #define IMXMCI_PEND_WAIT_RESP_m (1 << IMXMCI_PEND_WAIT_RESP_b)
111 #define IMXMCI_PEND_DMA_DATA_m (1 << IMXMCI_PEND_DMA_DATA_b)
112 #define IMXMCI_PEND_CPU_DATA_m (1 << IMXMCI_PEND_CPU_DATA_b)
113 #define IMXMCI_PEND_CARD_XCHG_m (1 << IMXMCI_PEND_CARD_XCHG_b)
114 #define IMXMCI_PEND_SET_INIT_m (1 << IMXMCI_PEND_SET_INIT_b)
115 #define IMXMCI_PEND_STARTED_m (1 << IMXMCI_PEND_STARTED_b)
116
117 static void imxmci_stop_clock(struct imxmci_host *host)
118 {
119 int i = 0;
120 MMC_STR_STP_CLK &= ~STR_STP_CLK_START_CLK;
121 while(i < 0x1000) {
122 if(!(i & 0x7f))
123 MMC_STR_STP_CLK |= STR_STP_CLK_STOP_CLK;
124
125 if(!(MMC_STATUS & STATUS_CARD_BUS_CLK_RUN)) {
126 /* Check twice before cut */
127 if(!(MMC_STATUS & STATUS_CARD_BUS_CLK_RUN))
128 return;
129 }
130
131 i++;
132 }
133 dev_dbg(mmc_dev(host->mmc), "imxmci_stop_clock blocked, no luck\n");
134 }
135
136 static int imxmci_start_clock(struct imxmci_host *host)
137 {
138 unsigned int trials = 0;
139 unsigned int delay_limit = 128;
140 unsigned long flags;
141
142 MMC_STR_STP_CLK &= ~STR_STP_CLK_STOP_CLK;
143
144 clear_bit(IMXMCI_PEND_STARTED_b, &host->pending_events);
145
146 /*
147 * Command start of the clock, this usually succeeds in less
148 * then 6 delay loops, but during card detection (low clockrate)
149 * it takes up to 5000 delay loops and sometimes fails for the first time
150 */
151 MMC_STR_STP_CLK |= STR_STP_CLK_START_CLK;
152
153 do {
154 unsigned int delay = delay_limit;
155
156 while(delay--){
157 if(MMC_STATUS & STATUS_CARD_BUS_CLK_RUN)
158 /* Check twice before cut */
159 if(MMC_STATUS & STATUS_CARD_BUS_CLK_RUN)
160 return 0;
161
162 if(test_bit(IMXMCI_PEND_STARTED_b, &host->pending_events))
163 return 0;
164 }
165
166 local_irq_save(flags);
167 /*
168 * Ensure, that request is not doubled under all possible circumstances.
169 * It is possible, that cock running state is missed, because some other
170 * IRQ or schedule delays this function execution and the clocks has
171 * been already stopped by other means (response processing, SDHC HW)
172 */
173 if(!test_bit(IMXMCI_PEND_STARTED_b, &host->pending_events))
174 MMC_STR_STP_CLK |= STR_STP_CLK_START_CLK;
175 local_irq_restore(flags);
176
177 } while(++trials<256);
178
179 dev_err(mmc_dev(host->mmc), "imxmci_start_clock blocked, no luck\n");
180
181 return -1;
182 }
183
184 static void imxmci_softreset(void)
185 {
186 /* reset sequence */
187 MMC_STR_STP_CLK = 0x8;
188 MMC_STR_STP_CLK = 0xD;
189 MMC_STR_STP_CLK = 0x5;
190 MMC_STR_STP_CLK = 0x5;
191 MMC_STR_STP_CLK = 0x5;
192 MMC_STR_STP_CLK = 0x5;
193 MMC_STR_STP_CLK = 0x5;
194 MMC_STR_STP_CLK = 0x5;
195 MMC_STR_STP_CLK = 0x5;
196 MMC_STR_STP_CLK = 0x5;
197
198 MMC_RES_TO = 0xff;
199 MMC_BLK_LEN = 512;
200 MMC_NOB = 1;
201 }
202
203 static int imxmci_busy_wait_for_status(struct imxmci_host *host,
204 unsigned int *pstat, unsigned int stat_mask,
205 int timeout, const char *where)
206 {
207 int loops=0;
208 while(!(*pstat & stat_mask)) {
209 loops+=2;
210 if(loops >= timeout) {
211 dev_dbg(mmc_dev(host->mmc), "busy wait timeout in %s, STATUS = 0x%x (0x%x)\n",
212 where, *pstat, stat_mask);
213 return -1;
214 }
215 udelay(2);
216 *pstat |= MMC_STATUS;
217 }
218 if(!loops)
219 return 0;
220
221 /* The busy-wait is expected there for clock <8MHz due to SDHC hardware flaws */
222 if(!(stat_mask & STATUS_END_CMD_RESP) || (host->mmc->ios.clock>=8000000))
223 dev_info(mmc_dev(host->mmc), "busy wait for %d usec in %s, STATUS = 0x%x (0x%x)\n",
224 loops, where, *pstat, stat_mask);
225 return loops;
226 }
227
228 static void imxmci_setup_data(struct imxmci_host *host, struct mmc_data *data)
229 {
230 unsigned int nob = data->blocks;
231 unsigned int blksz = 1 << data->blksz_bits;
232 unsigned int datasz = nob * blksz;
233 int i;
234
235 if (data->flags & MMC_DATA_STREAM)
236 nob = 0xffff;
237
238 host->data = data;
239 data->bytes_xfered = 0;
240
241 MMC_NOB = nob;
242 MMC_BLK_LEN = blksz;
243
244 /*
245 * DMA cannot be used for small block sizes, we have to use CPU driven transfers otherwise.
246 * We are in big troubles for non-512 byte transfers according to note in the paragraph
247 * 20.6.7 of User Manual anyway, but we need to be able to transfer SCR at least.
248 * The situation is even more complex in reality. The SDHC in not able to handle wll
249 * partial FIFO fills and reads. The length has to be rounded up to burst size multiple.
250 * This is required for SCR read at least.
251 */
252 if (datasz < 64) {
253 host->dma_size = datasz;
254 if (data->flags & MMC_DATA_READ) {
255 host->dma_dir = DMA_FROM_DEVICE;
256
257 /* Hack to enable read SCR */
258 if(datasz < 16) {
259 MMC_NOB = 1;
260 MMC_BLK_LEN = 16;
261 }
262 } else {
263 host->dma_dir = DMA_TO_DEVICE;
264 }
265
266 /* Convert back to virtual address */
267 host->data_ptr = (u16*)(page_address(data->sg->page) + data->sg->offset);
268 host->data_cnt = 0;
269
270 clear_bit(IMXMCI_PEND_DMA_DATA_b, &host->pending_events);
271 set_bit(IMXMCI_PEND_CPU_DATA_b, &host->pending_events);
272
273 return;
274 }
275
276 if (data->flags & MMC_DATA_READ) {
277 host->dma_dir = DMA_FROM_DEVICE;
278 host->dma_nents = dma_map_sg(mmc_dev(host->mmc), data->sg,
279 data->sg_len, host->dma_dir);
280
281 imx_dma_setup_sg(host->dma, data->sg, data->sg_len, datasz,
282 host->res->start + MMC_BUFFER_ACCESS_OFS, DMA_MODE_READ);
283
284 /*imx_dma_setup_mem2dev_ccr(host->dma, DMA_MODE_READ, IMX_DMA_WIDTH_16, CCR_REN);*/
285 CCR(host->dma) = CCR_DMOD_LINEAR | CCR_DSIZ_32 | CCR_SMOD_FIFO | CCR_SSIZ_16 | CCR_REN;
286 } else {
287 host->dma_dir = DMA_TO_DEVICE;
288
289 host->dma_nents = dma_map_sg(mmc_dev(host->mmc), data->sg,
290 data->sg_len, host->dma_dir);
291
292 imx_dma_setup_sg(host->dma, data->sg, data->sg_len, datasz,
293 host->res->start + MMC_BUFFER_ACCESS_OFS, DMA_MODE_WRITE);
294
295 /*imx_dma_setup_mem2dev_ccr(host->dma, DMA_MODE_WRITE, IMX_DMA_WIDTH_16, CCR_REN);*/
296 CCR(host->dma) = CCR_SMOD_LINEAR | CCR_SSIZ_32 | CCR_DMOD_FIFO | CCR_DSIZ_16 | CCR_REN;
297 }
298
299 #if 1 /* This code is there only for consistency checking and can be disabled in future */
300 host->dma_size = 0;
301 for(i=0; i<host->dma_nents; i++)
302 host->dma_size+=data->sg[i].length;
303
304 if (datasz > host->dma_size) {
305 dev_err(mmc_dev(host->mmc), "imxmci_setup_data datasz 0x%x > 0x%x dm_size\n",
306 datasz, host->dma_size);
307 }
308 #endif
309
310 host->dma_size = datasz;
311
312 wmb();
313
314 if(host->actual_bus_width == MMC_BUS_WIDTH_4)
315 BLR(host->dma) = 0; /* burst 64 byte read / 64 bytes write */
316 else
317 BLR(host->dma) = 16; /* burst 16 byte read / 16 bytes write */
318
319 RSSR(host->dma) = DMA_REQ_SDHC;
320
321 set_bit(IMXMCI_PEND_DMA_DATA_b, &host->pending_events);
322 clear_bit(IMXMCI_PEND_CPU_DATA_b, &host->pending_events);
323
324 /* start DMA engine for read, write is delayed after initial response */
325 if (host->dma_dir == DMA_FROM_DEVICE) {
326 imx_dma_enable(host->dma);
327 }
328 }
329
330 static void imxmci_start_cmd(struct imxmci_host *host, struct mmc_command *cmd, unsigned int cmdat)
331 {
332 unsigned long flags;
333 u32 imask;
334
335 WARN_ON(host->cmd != NULL);
336 host->cmd = cmd;
337
338 /* Ensure, that clock are stopped else command programming and start fails */
339 imxmci_stop_clock(host);
340
341 if (cmd->flags & MMC_RSP_BUSY)
342 cmdat |= CMD_DAT_CONT_BUSY;
343
344 switch (mmc_resp_type(cmd)) {
345 case MMC_RSP_R1: /* short CRC, OPCODE */
346 case MMC_RSP_R1B:/* short CRC, OPCODE, BUSY */
347 cmdat |= CMD_DAT_CONT_RESPONSE_FORMAT_R1;
348 break;
349 case MMC_RSP_R2: /* long 136 bit + CRC */
350 cmdat |= CMD_DAT_CONT_RESPONSE_FORMAT_R2;
351 break;
352 case MMC_RSP_R3: /* short */
353 cmdat |= CMD_DAT_CONT_RESPONSE_FORMAT_R3;
354 break;
355 case MMC_RSP_R6: /* short CRC */
356 cmdat |= CMD_DAT_CONT_RESPONSE_FORMAT_R6;
357 break;
358 default:
359 break;
360 }
361
362 if ( test_and_clear_bit(IMXMCI_PEND_SET_INIT_b, &host->pending_events) )
363 cmdat |= CMD_DAT_CONT_INIT; /* This command needs init */
364
365 if ( host->actual_bus_width == MMC_BUS_WIDTH_4 )
366 cmdat |= CMD_DAT_CONT_BUS_WIDTH_4;
367
368 MMC_CMD = cmd->opcode;
369 MMC_ARGH = cmd->arg >> 16;
370 MMC_ARGL = cmd->arg & 0xffff;
371 MMC_CMD_DAT_CONT = cmdat;
372
373 atomic_set(&host->stuck_timeout, 0);
374 set_bit(IMXMCI_PEND_WAIT_RESP_b, &host->pending_events);
375
376
377 imask = IMXMCI_INT_MASK_DEFAULT;
378 imask &= ~INT_MASK_END_CMD_RES;
379 if ( cmdat & CMD_DAT_CONT_DATA_ENABLE ) {
380 /*imask &= ~INT_MASK_BUF_READY;*/
381 imask &= ~INT_MASK_DATA_TRAN;
382 if ( cmdat & CMD_DAT_CONT_WRITE )
383 imask &= ~INT_MASK_WRITE_OP_DONE;
384 if(test_bit(IMXMCI_PEND_CPU_DATA_b, &host->pending_events))
385 imask &= ~INT_MASK_BUF_READY;
386 }
387
388 spin_lock_irqsave(&host->lock, flags);
389 host->imask = imask;
390 MMC_INT_MASK = host->imask;
391 spin_unlock_irqrestore(&host->lock, flags);
392
393 dev_dbg(mmc_dev(host->mmc), "CMD%02d (0x%02x) mask set to 0x%04x\n",
394 cmd->opcode, cmd->opcode, imask);
395
396 imxmci_start_clock(host);
397 }
398
399 static void imxmci_finish_request(struct imxmci_host *host, struct mmc_request *req)
400 {
401 unsigned long flags;
402
403 spin_lock_irqsave(&host->lock, flags);
404
405 host->pending_events &= ~(IMXMCI_PEND_WAIT_RESP_m | IMXMCI_PEND_DMA_END_m |
406 IMXMCI_PEND_DMA_DATA_m | IMXMCI_PEND_CPU_DATA_m);
407
408 host->imask = IMXMCI_INT_MASK_DEFAULT;
409 MMC_INT_MASK = host->imask;
410
411 spin_unlock_irqrestore(&host->lock, flags);
412
413 host->req = NULL;
414 host->cmd = NULL;
415 host->data = NULL;
416 mmc_request_done(host->mmc, req);
417 }
418
419 static int imxmci_finish_data(struct imxmci_host *host, unsigned int stat)
420 {
421 struct mmc_data *data = host->data;
422 int data_error;
423
424 if(test_and_clear_bit(IMXMCI_PEND_DMA_DATA_b, &host->pending_events)){
425 imx_dma_disable(host->dma);
426 dma_unmap_sg(mmc_dev(host->mmc), data->sg, host->dma_nents,
427 host->dma_dir);
428 }
429
430 if ( stat & STATUS_ERR_MASK ) {
431 dev_dbg(mmc_dev(host->mmc), "request failed. status: 0x%08x\n",stat);
432 if(stat & (STATUS_CRC_READ_ERR | STATUS_CRC_WRITE_ERR))
433 data->error = MMC_ERR_BADCRC;
434 else if(stat & STATUS_TIME_OUT_READ)
435 data->error = MMC_ERR_TIMEOUT;
436 else
437 data->error = MMC_ERR_FAILED;
438 } else {
439 data->bytes_xfered = host->dma_size;
440 }
441
442 data_error = data->error;
443
444 host->data = NULL;
445
446 return data_error;
447 }
448
449 static int imxmci_cmd_done(struct imxmci_host *host, unsigned int stat)
450 {
451 struct mmc_command *cmd = host->cmd;
452 int i;
453 u32 a,b,c;
454 struct mmc_data *data = host->data;
455
456 if (!cmd)
457 return 0;
458
459 host->cmd = NULL;
460
461 if (stat & STATUS_TIME_OUT_RESP) {
462 dev_dbg(mmc_dev(host->mmc), "CMD TIMEOUT\n");
463 cmd->error = MMC_ERR_TIMEOUT;
464 } else if (stat & STATUS_RESP_CRC_ERR && cmd->flags & MMC_RSP_CRC) {
465 dev_dbg(mmc_dev(host->mmc), "cmd crc error\n");
466 cmd->error = MMC_ERR_BADCRC;
467 }
468
469 if(cmd->flags & MMC_RSP_PRESENT) {
470 if(cmd->flags & MMC_RSP_136) {
471 for (i = 0; i < 4; i++) {
472 u32 a = MMC_RES_FIFO & 0xffff;
473 u32 b = MMC_RES_FIFO & 0xffff;
474 cmd->resp[i] = a<<16 | b;
475 }
476 } else {
477 a = MMC_RES_FIFO & 0xffff;
478 b = MMC_RES_FIFO & 0xffff;
479 c = MMC_RES_FIFO & 0xffff;
480 cmd->resp[0] = a<<24 | b<<8 | c>>8;
481 }
482 }
483
484 dev_dbg(mmc_dev(host->mmc), "RESP 0x%08x, 0x%08x, 0x%08x, 0x%08x, error %d\n",
485 cmd->resp[0], cmd->resp[1], cmd->resp[2], cmd->resp[3], cmd->error);
486
487 if (data && (cmd->error == MMC_ERR_NONE) && !(stat & STATUS_ERR_MASK)) {
488 if (host->req->data->flags & MMC_DATA_WRITE) {
489
490 /* Wait for FIFO to be empty before starting DMA write */
491
492 stat = MMC_STATUS;
493 if(imxmci_busy_wait_for_status(host, &stat,
494 STATUS_APPL_BUFF_FE,
495 40, "imxmci_cmd_done DMA WR") < 0) {
496 cmd->error = MMC_ERR_FIFO;
497 imxmci_finish_data(host, stat);
498 if(host->req)
499 imxmci_finish_request(host, host->req);
500 dev_warn(mmc_dev(host->mmc), "STATUS = 0x%04x\n",
501 stat);
502 return 0;
503 }
504
505 if(test_bit(IMXMCI_PEND_DMA_DATA_b, &host->pending_events)) {
506 imx_dma_enable(host->dma);
507 }
508 }
509 } else {
510 struct mmc_request *req;
511 imxmci_stop_clock(host);
512 req = host->req;
513
514 if(data)
515 imxmci_finish_data(host, stat);
516
517 if( req ) {
518 imxmci_finish_request(host, req);
519 } else {
520 dev_warn(mmc_dev(host->mmc), "imxmci_cmd_done: no request to finish\n");
521 }
522 }
523
524 return 1;
525 }
526
527 static int imxmci_data_done(struct imxmci_host *host, unsigned int stat)
528 {
529 struct mmc_data *data = host->data;
530 int data_error;
531
532 if (!data)
533 return 0;
534
535 data_error = imxmci_finish_data(host, stat);
536
537 if (host->req->stop) {
538 imxmci_stop_clock(host);
539 imxmci_start_cmd(host, host->req->stop, 0);
540 } else {
541 struct mmc_request *req;
542 req = host->req;
543 if( req ) {
544 imxmci_finish_request(host, req);
545 } else {
546 dev_warn(mmc_dev(host->mmc), "imxmci_data_done: no request to finish\n");
547 }
548 }
549
550 return 1;
551 }
552
553 static int imxmci_cpu_driven_data(struct imxmci_host *host, unsigned int *pstat)
554 {
555 int i;
556 int burst_len;
557 int flush_len;
558 int trans_done = 0;
559 unsigned int stat = *pstat;
560
561 if(host->actual_bus_width != MMC_BUS_WIDTH_4)
562 burst_len = 16;
563 else
564 burst_len = 64;
565
566 /* This is unfortunately required */
567 dev_dbg(mmc_dev(host->mmc), "imxmci_cpu_driven_data running STATUS = 0x%x\n",
568 stat);
569
570 if(host->dma_dir == DMA_FROM_DEVICE) {
571 imxmci_busy_wait_for_status(host, &stat,
572 STATUS_APPL_BUFF_FF | STATUS_DATA_TRANS_DONE,
573 20, "imxmci_cpu_driven_data read");
574
575 while((stat & (STATUS_APPL_BUFF_FF | STATUS_DATA_TRANS_DONE)) &&
576 (host->data_cnt < host->dma_size)) {
577 if(burst_len >= host->dma_size - host->data_cnt) {
578 flush_len = burst_len;
579 burst_len = host->dma_size - host->data_cnt;
580 flush_len -= burst_len;
581 host->data_cnt = host->dma_size;
582 trans_done = 1;
583 } else {
584 flush_len = 0;
585 host->data_cnt += burst_len;
586 }
587
588 for(i = burst_len; i>=2 ; i-=2) {
589 *(host->data_ptr++) = MMC_BUFFER_ACCESS;
590 udelay(20); /* required for clocks < 8MHz*/
591 }
592
593 if(i == 1)
594 *(u8*)(host->data_ptr) = MMC_BUFFER_ACCESS;
595
596 stat = MMC_STATUS;
597
598 /* Flush extra bytes from FIFO */
599 while(flush_len && !(stat & STATUS_DATA_TRANS_DONE)){
600 i = MMC_BUFFER_ACCESS;
601 stat = MMC_STATUS;
602 stat &= ~STATUS_CRC_READ_ERR; /* Stupid but required there */
603 }
604
605 dev_dbg(mmc_dev(host->mmc), "imxmci_cpu_driven_data read burst %d STATUS = 0x%x\n",
606 burst_len, stat);
607 }
608 } else {
609 imxmci_busy_wait_for_status(host, &stat,
610 STATUS_APPL_BUFF_FE,
611 20, "imxmci_cpu_driven_data write");
612
613 while((stat & STATUS_APPL_BUFF_FE) &&
614 (host->data_cnt < host->dma_size)) {
615 if(burst_len >= host->dma_size - host->data_cnt) {
616 burst_len = host->dma_size - host->data_cnt;
617 host->data_cnt = host->dma_size;
618 trans_done = 1;
619 } else {
620 host->data_cnt += burst_len;
621 }
622
623 for(i = burst_len; i>0 ; i-=2)
624 MMC_BUFFER_ACCESS = *(host->data_ptr++);
625
626 stat = MMC_STATUS;
627
628 dev_dbg(mmc_dev(host->mmc), "imxmci_cpu_driven_data write burst %d STATUS = 0x%x\n",
629 burst_len, stat);
630 }
631 }
632
633 *pstat = stat;
634
635 return trans_done;
636 }
637
638 static void imxmci_dma_irq(int dma, void *devid, struct pt_regs *regs)
639 {
640 struct imxmci_host *host = devid;
641 uint32_t stat = MMC_STATUS;
642
643 atomic_set(&host->stuck_timeout, 0);
644 host->status_reg = stat;
645 set_bit(IMXMCI_PEND_DMA_END_b, &host->pending_events);
646 tasklet_schedule(&host->tasklet);
647 }
648
649 static irqreturn_t imxmci_irq(int irq, void *devid, struct pt_regs *regs)
650 {
651 struct imxmci_host *host = devid;
652 uint32_t stat = MMC_STATUS;
653 int handled = 1;
654
655 MMC_INT_MASK = host->imask | INT_MASK_SDIO | INT_MASK_AUTO_CARD_DETECT;
656
657 atomic_set(&host->stuck_timeout, 0);
658 host->status_reg = stat;
659 set_bit(IMXMCI_PEND_IRQ_b, &host->pending_events);
660 set_bit(IMXMCI_PEND_STARTED_b, &host->pending_events);
661 tasklet_schedule(&host->tasklet);
662
663 return IRQ_RETVAL(handled);;
664 }
665
666 static void imxmci_tasklet_fnc(unsigned long data)
667 {
668 struct imxmci_host *host = (struct imxmci_host *)data;
669 u32 stat;
670 unsigned int data_dir_mask = 0; /* STATUS_WR_CRC_ERROR_CODE_MASK */
671 int timeout = 0;
672
673 if(atomic_read(&host->stuck_timeout) > 4) {
674 char *what;
675 timeout = 1;
676 stat = MMC_STATUS;
677 host->status_reg = stat;
678 if (test_bit(IMXMCI_PEND_WAIT_RESP_b, &host->pending_events))
679 if (test_bit(IMXMCI_PEND_DMA_DATA_b, &host->pending_events))
680 what = "RESP+DMA";
681 else
682 what = "RESP";
683 else
684 if (test_bit(IMXMCI_PEND_DMA_DATA_b, &host->pending_events))
685 if(test_bit(IMXMCI_PEND_DMA_END_b, &host->pending_events))
686 what = "DATA";
687 else
688 what = "DMA";
689 else
690 what = "???";
691
692 dev_err(mmc_dev(host->mmc), "%s TIMEOUT, hardware stucked STATUS = 0x%04x IMASK = 0x%04x\n",
693 what, stat, MMC_INT_MASK);
694 dev_err(mmc_dev(host->mmc), "CMD_DAT_CONT = 0x%04x, MMC_BLK_LEN = 0x%04x, MMC_NOB = 0x%04x, DMA_CCR = 0x%08x\n",
695 MMC_CMD_DAT_CONT, MMC_BLK_LEN, MMC_NOB, CCR(host->dma));
696 dev_err(mmc_dev(host->mmc), "CMD%d, bus %d-bit, dma_size = 0x%x\n",
697 host->cmd?host->cmd->opcode:0, 1<<host->actual_bus_width, host->dma_size);
698 }
699
700 if(!host->present || timeout)
701 host->status_reg = STATUS_TIME_OUT_RESP | STATUS_TIME_OUT_READ |
702 STATUS_CRC_READ_ERR | STATUS_CRC_WRITE_ERR;
703
704 if(test_bit(IMXMCI_PEND_IRQ_b, &host->pending_events) || timeout) {
705 clear_bit(IMXMCI_PEND_IRQ_b, &host->pending_events);
706
707 stat = MMC_STATUS;
708 /*
709 * This is not required in theory, but there is chance to miss some flag
710 * which clears automatically by mask write, FreeScale original code keeps
711 * stat from IRQ time so do I
712 */
713 stat |= host->status_reg;
714
715 if(test_bit(IMXMCI_PEND_WAIT_RESP_b, &host->pending_events)) {
716 imxmci_busy_wait_for_status(host, &stat,
717 STATUS_END_CMD_RESP | STATUS_ERR_MASK,
718 20, "imxmci_tasklet_fnc resp (ERRATUM #4)");
719 }
720
721 if(stat & (STATUS_END_CMD_RESP | STATUS_ERR_MASK)) {
722 if(test_and_clear_bit(IMXMCI_PEND_WAIT_RESP_b, &host->pending_events))
723 imxmci_cmd_done(host, stat);
724 if(host->data && (stat & STATUS_ERR_MASK))
725 imxmci_data_done(host, stat);
726 }
727
728 if(test_bit(IMXMCI_PEND_CPU_DATA_b, &host->pending_events)) {
729 stat |= MMC_STATUS;
730 if(imxmci_cpu_driven_data(host, &stat)){
731 if(test_and_clear_bit(IMXMCI_PEND_WAIT_RESP_b, &host->pending_events))
732 imxmci_cmd_done(host, stat);
733 atomic_clear_mask(IMXMCI_PEND_IRQ_m|IMXMCI_PEND_CPU_DATA_m,
734 &host->pending_events);
735 imxmci_data_done(host, stat);
736 }
737 }
738 }
739
740 if(test_bit(IMXMCI_PEND_DMA_END_b, &host->pending_events) &&
741 !test_bit(IMXMCI_PEND_WAIT_RESP_b, &host->pending_events)) {
742
743 stat = MMC_STATUS;
744 /* Same as above */
745 stat |= host->status_reg;
746
747 if(host->dma_dir == DMA_TO_DEVICE) {
748 data_dir_mask = STATUS_WRITE_OP_DONE;
749 } else {
750 data_dir_mask = STATUS_DATA_TRANS_DONE;
751 }
752
753 if(stat & data_dir_mask) {
754 clear_bit(IMXMCI_PEND_DMA_END_b, &host->pending_events);
755 imxmci_data_done(host, stat);
756 }
757 }
758
759 if(test_and_clear_bit(IMXMCI_PEND_CARD_XCHG_b, &host->pending_events)) {
760
761 if(host->cmd)
762 imxmci_cmd_done(host, STATUS_TIME_OUT_RESP);
763
764 if(host->data)
765 imxmci_data_done(host, STATUS_TIME_OUT_READ |
766 STATUS_CRC_READ_ERR | STATUS_CRC_WRITE_ERR);
767
768 if(host->req)
769 imxmci_finish_request(host, host->req);
770
771 mmc_detect_change(host->mmc, msecs_to_jiffies(100));
772
773 }
774 }
775
776 static void imxmci_request(struct mmc_host *mmc, struct mmc_request *req)
777 {
778 struct imxmci_host *host = mmc_priv(mmc);
779 unsigned int cmdat;
780
781 WARN_ON(host->req != NULL);
782
783 host->req = req;
784
785 cmdat = 0;
786
787 if (req->data) {
788 imxmci_setup_data(host, req->data);
789
790 cmdat |= CMD_DAT_CONT_DATA_ENABLE;
791
792 if (req->data->flags & MMC_DATA_WRITE)
793 cmdat |= CMD_DAT_CONT_WRITE;
794
795 if (req->data->flags & MMC_DATA_STREAM) {
796 cmdat |= CMD_DAT_CONT_STREAM_BLOCK;
797 }
798 }
799
800 imxmci_start_cmd(host, req->cmd, cmdat);
801 }
802
803 #define CLK_RATE 19200000
804
805 static void imxmci_set_ios(struct mmc_host *mmc, struct mmc_ios *ios)
806 {
807 struct imxmci_host *host = mmc_priv(mmc);
808 int prescaler;
809
810 if( ios->bus_width==MMC_BUS_WIDTH_4 ) {
811 host->actual_bus_width = MMC_BUS_WIDTH_4;
812 imx_gpio_mode(PB11_PF_SD_DAT3);
813 }else{
814 host->actual_bus_width = MMC_BUS_WIDTH_1;
815 imx_gpio_mode(GPIO_PORTB | GPIO_IN | GPIO_PUEN | 11);
816 }
817
818 if ( host->power_mode != ios->power_mode ) {
819 switch (ios->power_mode) {
820 case MMC_POWER_OFF:
821 break;
822 case MMC_POWER_UP:
823 set_bit(IMXMCI_PEND_SET_INIT_b, &host->pending_events);
824 break;
825 case MMC_POWER_ON:
826 break;
827 }
828 host->power_mode = ios->power_mode;
829 }
830
831 if ( ios->clock ) {
832 unsigned int clk;
833
834 /* The prescaler is 5 for PERCLK2 equal to 96MHz
835 * then 96MHz / 5 = 19.2 MHz
836 */
837 clk=imx_get_perclk2();
838 prescaler=(clk+(CLK_RATE*7)/8)/CLK_RATE;
839 switch(prescaler) {
840 case 0:
841 case 1: prescaler = 0;
842 break;
843 case 2: prescaler = 1;
844 break;
845 case 3: prescaler = 2;
846 break;
847 case 4: prescaler = 4;
848 break;
849 default:
850 case 5: prescaler = 5;
851 break;
852 }
853
854 dev_dbg(mmc_dev(host->mmc), "PERCLK2 %d MHz -> prescaler %d\n",
855 clk, prescaler);
856
857 for(clk=0; clk<8; clk++) {
858 int x;
859 x = CLK_RATE / (1<<clk);
860 if( x <= ios->clock)
861 break;
862 }
863
864 MMC_STR_STP_CLK |= STR_STP_CLK_ENABLE; /* enable controller */
865
866 imxmci_stop_clock(host);
867 MMC_CLK_RATE = (prescaler<<3) | clk;
868 /*
869 * Under my understanding, clock should not be started there, because it would
870 * initiate SDHC sequencer and send last or random command into card
871 */
872 /*imxmci_start_clock(host);*/
873
874 dev_dbg(mmc_dev(host->mmc), "MMC_CLK_RATE: 0x%08x\n", MMC_CLK_RATE);
875 } else {
876 imxmci_stop_clock(host);
877 }
878 }
879
880 static struct mmc_host_ops imxmci_ops = {
881 .request = imxmci_request,
882 .set_ios = imxmci_set_ios,
883 };
884
885 static struct resource *platform_device_resource(struct platform_device *dev, unsigned int mask, int nr)
886 {
887 int i;
888
889 for (i = 0; i < dev->num_resources; i++)
890 if (dev->resource[i].flags == mask && nr-- == 0)
891 return &dev->resource[i];
892 return NULL;
893 }
894
895 static int platform_device_irq(struct platform_device *dev, int nr)
896 {
897 int i;
898
899 for (i = 0; i < dev->num_resources; i++)
900 if (dev->resource[i].flags == IORESOURCE_IRQ && nr-- == 0)
901 return dev->resource[i].start;
902 return NO_IRQ;
903 }
904
905 static void imxmci_check_status(unsigned long data)
906 {
907 struct imxmci_host *host = (struct imxmci_host *)data;
908
909 if( host->pdata->card_present() != host->present ) {
910 host->present ^= 1;
911 dev_info(mmc_dev(host->mmc), "card %s\n",
912 host->present ? "inserted" : "removed");
913
914 set_bit(IMXMCI_PEND_CARD_XCHG_b, &host->pending_events);
915 tasklet_schedule(&host->tasklet);
916 }
917
918 if(test_bit(IMXMCI_PEND_WAIT_RESP_b, &host->pending_events) ||
919 test_bit(IMXMCI_PEND_DMA_DATA_b, &host->pending_events)) {
920 atomic_inc(&host->stuck_timeout);
921 if(atomic_read(&host->stuck_timeout) > 4)
922 tasklet_schedule(&host->tasklet);
923 } else {
924 atomic_set(&host->stuck_timeout, 0);
925
926 }
927
928 mod_timer(&host->timer, jiffies + (HZ>>1));
929 }
930
931 static int imxmci_probe(struct platform_device *pdev)
932 {
933 struct mmc_host *mmc;
934 struct imxmci_host *host = NULL;
935 struct resource *r;
936 int ret = 0, irq;
937
938 printk(KERN_INFO "i.MX mmc driver\n");
939
940 r = platform_device_resource(pdev, IORESOURCE_MEM, 0);
941 irq = platform_device_irq(pdev, 0);
942 if (!r || irq == NO_IRQ)
943 return -ENXIO;
944
945 r = request_mem_region(r->start, 0x100, "IMXMCI");
946 if (!r)
947 return -EBUSY;
948
949 mmc = mmc_alloc_host(sizeof(struct imxmci_host), &pdev->dev);
950 if (!mmc) {
951 ret = -ENOMEM;
952 goto out;
953 }
954
955 mmc->ops = &imxmci_ops;
956 mmc->f_min = 150000;
957 mmc->f_max = CLK_RATE/2;
958 mmc->ocr_avail = MMC_VDD_32_33;
959 mmc->caps |= MMC_CAP_4_BIT_DATA;
960
961 /* MMC core transfer sizes tunable parameters */
962 mmc->max_hw_segs = 64;
963 mmc->max_phys_segs = 64;
964 mmc->max_sectors = 64; /* default 1 << (PAGE_CACHE_SHIFT - 9) */
965 mmc->max_seg_size = 64*512; /* default PAGE_CACHE_SIZE */
966
967 host = mmc_priv(mmc);
968 host->mmc = mmc;
969 host->dma_allocated = 0;
970 host->pdata = pdev->dev.platform_data;
971
972 spin_lock_init(&host->lock);
973 host->res = r;
974 host->irq = irq;
975
976 imx_gpio_mode(PB8_PF_SD_DAT0);
977 imx_gpio_mode(PB9_PF_SD_DAT1);
978 imx_gpio_mode(PB10_PF_SD_DAT2);
979 /* Configured as GPIO with pull-up to ensure right MCC card mode */
980 /* Switched to PB11_PF_SD_DAT3 if 4 bit bus is configured */
981 imx_gpio_mode(GPIO_PORTB | GPIO_IN | GPIO_PUEN | 11);
982 /* imx_gpio_mode(PB11_PF_SD_DAT3); */
983 imx_gpio_mode(PB12_PF_SD_CLK);
984 imx_gpio_mode(PB13_PF_SD_CMD);
985
986 imxmci_softreset();
987
988 if ( MMC_REV_NO != 0x390 ) {
989 dev_err(mmc_dev(host->mmc), "wrong rev.no. 0x%08x. aborting.\n",
990 MMC_REV_NO);
991 goto out;
992 }
993
994 MMC_READ_TO = 0x2db4; /* recommended in data sheet */
995
996 host->imask = IMXMCI_INT_MASK_DEFAULT;
997 MMC_INT_MASK = host->imask;
998
999
1000 if(imx_dma_request_by_prio(&host->dma, DRIVER_NAME, DMA_PRIO_LOW)<0){
1001 dev_err(mmc_dev(host->mmc), "imx_dma_request_by_prio failed\n");
1002 ret = -EBUSY;
1003 goto out;
1004 }
1005 host->dma_allocated=1;
1006 imx_dma_setup_handlers(host->dma, imxmci_dma_irq, NULL, host);
1007
1008 tasklet_init(&host->tasklet, imxmci_tasklet_fnc, (unsigned long)host);
1009 host->status_reg=0;
1010 host->pending_events=0;
1011
1012 ret = request_irq(host->irq, imxmci_irq, 0, DRIVER_NAME, host);
1013 if (ret)
1014 goto out;
1015
1016 host->present = host->pdata->card_present();
1017 init_timer(&host->timer);
1018 host->timer.data = (unsigned long)host;
1019 host->timer.function = imxmci_check_status;
1020 add_timer(&host->timer);
1021 mod_timer(&host->timer, jiffies + (HZ>>1));
1022
1023 platform_set_drvdata(pdev, mmc);
1024
1025 mmc_add_host(mmc);
1026
1027 return 0;
1028
1029 out:
1030 if (host) {
1031 if(host->dma_allocated){
1032 imx_dma_free(host->dma);
1033 host->dma_allocated=0;
1034 }
1035 }
1036 if (mmc)
1037 mmc_free_host(mmc);
1038 release_resource(r);
1039 return ret;
1040 }
1041
1042 static int imxmci_remove(struct platform_device *pdev)
1043 {
1044 struct mmc_host *mmc = platform_get_drvdata(pdev);
1045
1046 platform_set_drvdata(pdev, NULL);
1047
1048 if (mmc) {
1049 struct imxmci_host *host = mmc_priv(mmc);
1050
1051 tasklet_disable(&host->tasklet);
1052
1053 del_timer_sync(&host->timer);
1054 mmc_remove_host(mmc);
1055
1056 free_irq(host->irq, host);
1057 if(host->dma_allocated){
1058 imx_dma_free(host->dma);
1059 host->dma_allocated=0;
1060 }
1061
1062 tasklet_kill(&host->tasklet);
1063
1064 release_resource(host->res);
1065
1066 mmc_free_host(mmc);
1067 }
1068 return 0;
1069 }
1070
1071 #ifdef CONFIG_PM
1072 static int imxmci_suspend(struct platform_device *dev, pm_message_t state)
1073 {
1074 struct mmc_host *mmc = platform_get_drvdata(dev);
1075 int ret = 0;
1076
1077 if (mmc)
1078 ret = mmc_suspend_host(mmc, state);
1079
1080 return ret;
1081 }
1082
1083 static int imxmci_resume(struct platform_device *dev)
1084 {
1085 struct mmc_host *mmc = platform_get_drvdata(dev);
1086 struct imxmci_host *host;
1087 int ret = 0;
1088
1089 if (mmc) {
1090 host = mmc_priv(mmc);
1091 if(host)
1092 set_bit(IMXMCI_PEND_SET_INIT_b, &host->pending_events);
1093 ret = mmc_resume_host(mmc);
1094 }
1095
1096 return ret;
1097 }
1098 #else
1099 #define imxmci_suspend NULL
1100 #define imxmci_resume NULL
1101 #endif /* CONFIG_PM */
1102
1103 static struct platform_driver imxmci_driver = {
1104 .probe = imxmci_probe,
1105 .remove = imxmci_remove,
1106 .suspend = imxmci_suspend,
1107 .resume = imxmci_resume,
1108 .driver = {
1109 .name = DRIVER_NAME,
1110 }
1111 };
1112
1113 static int __init imxmci_init(void)
1114 {
1115 return platform_driver_register(&imxmci_driver);
1116 }
1117
1118 static void __exit imxmci_exit(void)
1119 {
1120 platform_driver_unregister(&imxmci_driver);
1121 }
1122
1123 module_init(imxmci_init);
1124 module_exit(imxmci_exit);
1125
1126 MODULE_DESCRIPTION("i.MX Multimedia Card Interface Driver");
1127 MODULE_AUTHOR("Sascha Hauer, Pengutronix");
1128 MODULE_LICENSE("GPL");
Linux with added FPC-III support