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MOXA linux-2.6.x / linux-2.6.9-uc0 from sdlinux-moxaart.tgz
[linux-2.6.9-moxart.git] / drivers / mmc / host / imxmmc.c
blob54bfc9f255966329b6e01c290650f297e7859154
1 /*
2 * linux/drivers/mmc/host/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
29 #ifdef CONFIG_MMC_DEBUG
30 #define DEBUG
31 #else
32 #undef DEBUG
33 #endif
34
35 #include <linux/module.h>
36 #include <linux/init.h>
37 #include <linux/ioport.h>
38 #include <linux/platform_device.h>
39 #include <linux/interrupt.h>
40 #include <linux/blkdev.h>
41 #include <linux/dma-mapping.h>
42 #include <linux/mmc/host.h>
43 #include <linux/mmc/card.h>
44 #include <linux/delay.h>
45
46 #include <asm/dma.h>
47 #include <asm/io.h>
48 #include <asm/irq.h>
49 #include <asm/sizes.h>
50 #include <asm/arch/mmc.h>
51 #include <asm/arch/imx-dma.h>
52
53 #include "imxmmc.h"
54
55 #define DRIVER_NAME "imx-mmc"
56
57 #define IMXMCI_INT_MASK_DEFAULT (INT_MASK_BUF_READY | INT_MASK_DATA_TRAN | \
58 INT_MASK_WRITE_OP_DONE | INT_MASK_END_CMD_RES | \
59 INT_MASK_AUTO_CARD_DETECT | INT_MASK_DAT0_EN | INT_MASK_SDIO)
60
61 struct imxmci_host {
62 struct mmc_host *mmc;
63 spinlock_t lock;
64 struct resource *res;
65 int irq;
66 imx_dmach_t dma;
67 unsigned int clkrt;
68 unsigned int cmdat;
69 volatile unsigned int imask;
70 unsigned int power_mode;
71 unsigned int present;
72 struct imxmmc_platform_data *pdata;
73
74 struct mmc_request *req;
75 struct mmc_command *cmd;
76 struct mmc_data *data;
77
78 struct timer_list timer;
79 struct tasklet_struct tasklet;
80 unsigned int status_reg;
81 unsigned long pending_events;
82 /* Next to fields are there for CPU driven transfers to overcome SDHC deficiencies */
83 u16 *data_ptr;
84 unsigned int data_cnt;
85 atomic_t stuck_timeout;
86
87 unsigned int dma_nents;
88 unsigned int dma_size;
89 unsigned int dma_dir;
90 int dma_allocated;
91
92 unsigned char actual_bus_width;
93
94 int prev_cmd_code;
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 = data->blksz;
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 < 512) {
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 MMC_NOB = 1;
259 MMC_BLK_LEN = 512;
260 } else {
261 host->dma_dir = DMA_TO_DEVICE;
262 }
263
264 /* Convert back to virtual address */
265 host->data_ptr = (u16*)(page_address(data->sg->page) + data->sg->offset);
266 host->data_cnt = 0;
267
268 clear_bit(IMXMCI_PEND_DMA_DATA_b, &host->pending_events);
269 set_bit(IMXMCI_PEND_CPU_DATA_b, &host->pending_events);
270
271 return;
272 }
273
274 if (data->flags & MMC_DATA_READ) {
275 host->dma_dir = DMA_FROM_DEVICE;
276 host->dma_nents = dma_map_sg(mmc_dev(host->mmc), data->sg,
277 data->sg_len, host->dma_dir);
278
279 imx_dma_setup_sg(host->dma, data->sg, data->sg_len, datasz,
280 host->res->start + MMC_BUFFER_ACCESS_OFS, DMA_MODE_READ);
281
282 /*imx_dma_setup_mem2dev_ccr(host->dma, DMA_MODE_READ, IMX_DMA_WIDTH_16, CCR_REN);*/
283 CCR(host->dma) = CCR_DMOD_LINEAR | CCR_DSIZ_32 | CCR_SMOD_FIFO | CCR_SSIZ_16 | CCR_REN;
284 } else {
285 host->dma_dir = DMA_TO_DEVICE;
286
287 host->dma_nents = dma_map_sg(mmc_dev(host->mmc), data->sg,
288 data->sg_len, host->dma_dir);
289
290 imx_dma_setup_sg(host->dma, data->sg, data->sg_len, datasz,
291 host->res->start + MMC_BUFFER_ACCESS_OFS, DMA_MODE_WRITE);
292
293 /*imx_dma_setup_mem2dev_ccr(host->dma, DMA_MODE_WRITE, IMX_DMA_WIDTH_16, CCR_REN);*/
294 CCR(host->dma) = CCR_SMOD_LINEAR | CCR_SSIZ_32 | CCR_DMOD_FIFO | CCR_DSIZ_16 | CCR_REN;
295 }
296
297 #if 1 /* This code is there only for consistency checking and can be disabled in future */
298 host->dma_size = 0;
299 for(i=0; i<host->dma_nents; i++)
300 host->dma_size+=data->sg[i].length;
301
302 if (datasz > host->dma_size) {
303 dev_err(mmc_dev(host->mmc), "imxmci_setup_data datasz 0x%x > 0x%x dm_size\n",
304 datasz, host->dma_size);
305 }
306 #endif
307
308 host->dma_size = datasz;
309
310 wmb();
311
312 if(host->actual_bus_width == MMC_BUS_WIDTH_4)
313 BLR(host->dma) = 0; /* burst 64 byte read / 64 bytes write */
314 else
315 BLR(host->dma) = 16; /* burst 16 byte read / 16 bytes write */
316
317 RSSR(host->dma) = DMA_REQ_SDHC;
318
319 set_bit(IMXMCI_PEND_DMA_DATA_b, &host->pending_events);
320 clear_bit(IMXMCI_PEND_CPU_DATA_b, &host->pending_events);
321
322 /* start DMA engine for read, write is delayed after initial response */
323 if (host->dma_dir == DMA_FROM_DEVICE) {
324 imx_dma_enable(host->dma);
325 }
326 }
327
328 static void imxmci_start_cmd(struct imxmci_host *host, struct mmc_command *cmd, unsigned int cmdat)
329 {
330 unsigned long flags;
331 u32 imask;
332
333 WARN_ON(host->cmd != NULL);
334 host->cmd = cmd;
335
336 /* Ensure, that clock are stopped else command programming and start fails */
337 imxmci_stop_clock(host);
338
339 if (cmd->flags & MMC_RSP_BUSY)
340 cmdat |= CMD_DAT_CONT_BUSY;
341
342 switch (mmc_resp_type(cmd)) {
343 case MMC_RSP_R1: /* short CRC, OPCODE */
344 case MMC_RSP_R1B:/* short CRC, OPCODE, BUSY */
345 cmdat |= CMD_DAT_CONT_RESPONSE_FORMAT_R1;
346 break;
347 case MMC_RSP_R2: /* long 136 bit + CRC */
348 cmdat |= CMD_DAT_CONT_RESPONSE_FORMAT_R2;
349 break;
350 case MMC_RSP_R3: /* short */
351 cmdat |= CMD_DAT_CONT_RESPONSE_FORMAT_R3;
352 break;
353 default:
354 break;
355 }
356
357 if ( test_and_clear_bit(IMXMCI_PEND_SET_INIT_b, &host->pending_events) )
358 cmdat |= CMD_DAT_CONT_INIT; /* This command needs init */
359
360 if ( host->actual_bus_width == MMC_BUS_WIDTH_4 )
361 cmdat |= CMD_DAT_CONT_BUS_WIDTH_4;
362
363 MMC_CMD = cmd->opcode;
364 MMC_ARGH = cmd->arg >> 16;
365 MMC_ARGL = cmd->arg & 0xffff;
366 MMC_CMD_DAT_CONT = cmdat;
367
368 atomic_set(&host->stuck_timeout, 0);
369 set_bit(IMXMCI_PEND_WAIT_RESP_b, &host->pending_events);
370
371
372 imask = IMXMCI_INT_MASK_DEFAULT;
373 imask &= ~INT_MASK_END_CMD_RES;
374 if ( cmdat & CMD_DAT_CONT_DATA_ENABLE ) {
375 /*imask &= ~INT_MASK_BUF_READY;*/
376 imask &= ~INT_MASK_DATA_TRAN;
377 if ( cmdat & CMD_DAT_CONT_WRITE )
378 imask &= ~INT_MASK_WRITE_OP_DONE;
379 if(test_bit(IMXMCI_PEND_CPU_DATA_b, &host->pending_events))
380 imask &= ~INT_MASK_BUF_READY;
381 }
382
383 spin_lock_irqsave(&host->lock, flags);
384 host->imask = imask;
385 MMC_INT_MASK = host->imask;
386 spin_unlock_irqrestore(&host->lock, flags);
387
388 dev_dbg(mmc_dev(host->mmc), "CMD%02d (0x%02x) mask set to 0x%04x\n",
389 cmd->opcode, cmd->opcode, imask);
390
391 imxmci_start_clock(host);
392 }
393
394 static void imxmci_finish_request(struct imxmci_host *host, struct mmc_request *req)
395 {
396 unsigned long flags;
397
398 spin_lock_irqsave(&host->lock, flags);
399
400 host->pending_events &= ~(IMXMCI_PEND_WAIT_RESP_m | IMXMCI_PEND_DMA_END_m |
401 IMXMCI_PEND_DMA_DATA_m | IMXMCI_PEND_CPU_DATA_m);
402
403 host->imask = IMXMCI_INT_MASK_DEFAULT;
404 MMC_INT_MASK = host->imask;
405
406 spin_unlock_irqrestore(&host->lock, flags);
407
408 if(req && req->cmd)
409 host->prev_cmd_code = req->cmd->opcode;
410
411 host->req = NULL;
412 host->cmd = NULL;
413 host->data = NULL;
414 mmc_request_done(host->mmc, req);
415 }
416
417 static int imxmci_finish_data(struct imxmci_host *host, unsigned int stat)
418 {
419 struct mmc_data *data = host->data;
420 int data_error;
421
422 if(test_and_clear_bit(IMXMCI_PEND_DMA_DATA_b, &host->pending_events)){
423 imx_dma_disable(host->dma);
424 dma_unmap_sg(mmc_dev(host->mmc), data->sg, host->dma_nents,
425 host->dma_dir);
426 }
427
428 if ( stat & STATUS_ERR_MASK ) {
429 dev_dbg(mmc_dev(host->mmc), "request failed. status: 0x%08x\n",stat);
430 if(stat & (STATUS_CRC_READ_ERR | STATUS_CRC_WRITE_ERR))
431 data->error = MMC_ERR_BADCRC;
432 else if(stat & STATUS_TIME_OUT_READ)
433 data->error = MMC_ERR_TIMEOUT;
434 else
435 data->error = MMC_ERR_FAILED;
436 } else {
437 data->bytes_xfered = host->dma_size;
438 }
439
440 data_error = data->error;
441
442 host->data = NULL;
443
444 return data_error;
445 }
446
447 static int imxmci_cmd_done(struct imxmci_host *host, unsigned int stat)
448 {
449 struct mmc_command *cmd = host->cmd;
450 int i;
451 u32 a,b,c;
452 struct mmc_data *data = host->data;
453
454 if (!cmd)
455 return 0;
456
457 host->cmd = NULL;
458
459 if (stat & STATUS_TIME_OUT_RESP) {
460 dev_dbg(mmc_dev(host->mmc), "CMD TIMEOUT\n");
461 cmd->error = MMC_ERR_TIMEOUT;
462 } else if (stat & STATUS_RESP_CRC_ERR && cmd->flags & MMC_RSP_CRC) {
463 dev_dbg(mmc_dev(host->mmc), "cmd crc error\n");
464 cmd->error = MMC_ERR_BADCRC;
465 }
466
467 if(cmd->flags & MMC_RSP_PRESENT) {
468 if(cmd->flags & MMC_RSP_136) {
469 for (i = 0; i < 4; i++) {
470 u32 a = MMC_RES_FIFO & 0xffff;
471 u32 b = MMC_RES_FIFO & 0xffff;
472 cmd->resp[i] = a<<16 | b;
473 }
474 } else {
475 a = MMC_RES_FIFO & 0xffff;
476 b = MMC_RES_FIFO & 0xffff;
477 c = MMC_RES_FIFO & 0xffff;
478 cmd->resp[0] = a<<24 | b<<8 | c>>8;
479 }
480 }
481
482 dev_dbg(mmc_dev(host->mmc), "RESP 0x%08x, 0x%08x, 0x%08x, 0x%08x, error %d\n",
483 cmd->resp[0], cmd->resp[1], cmd->resp[2], cmd->resp[3], cmd->error);
484
485 if (data && (cmd->error == MMC_ERR_NONE) && !(stat & STATUS_ERR_MASK)) {
486 if (host->req->data->flags & MMC_DATA_WRITE) {
487
488 /* Wait for FIFO to be empty before starting DMA write */
489
490 stat = MMC_STATUS;
491 if(imxmci_busy_wait_for_status(host, &stat,
492 STATUS_APPL_BUFF_FE,
493 40, "imxmci_cmd_done DMA WR") < 0) {
494 cmd->error = MMC_ERR_FIFO;
495 imxmci_finish_data(host, stat);
496 if(host->req)
497 imxmci_finish_request(host, host->req);
498 dev_warn(mmc_dev(host->mmc), "STATUS = 0x%04x\n",
499 stat);
500 return 0;
501 }
502
503 if(test_bit(IMXMCI_PEND_DMA_DATA_b, &host->pending_events)) {
504 imx_dma_enable(host->dma);
505 }
506 }
507 } else {
508 struct mmc_request *req;
509 imxmci_stop_clock(host);
510 req = host->req;
511
512 if(data)
513 imxmci_finish_data(host, stat);
514
515 if( req ) {
516 imxmci_finish_request(host, req);
517 } else {
518 dev_warn(mmc_dev(host->mmc), "imxmci_cmd_done: no request to finish\n");
519 }
520 }
521
522 return 1;
523 }
524
525 static int imxmci_data_done(struct imxmci_host *host, unsigned int stat)
526 {
527 struct mmc_data *data = host->data;
528 int data_error;
529
530 if (!data)
531 return 0;
532
533 data_error = imxmci_finish_data(host, stat);
534
535 if (host->req->stop) {
536 imxmci_stop_clock(host);
537 imxmci_start_cmd(host, host->req->stop, 0);
538 } else {
539 struct mmc_request *req;
540 req = host->req;
541 if( req ) {
542 imxmci_finish_request(host, req);
543 } else {
544 dev_warn(mmc_dev(host->mmc), "imxmci_data_done: no request to finish\n");
545 }
546 }
547
548 return 1;
549 }
550
551 static int imxmci_cpu_driven_data(struct imxmci_host *host, unsigned int *pstat)
552 {
553 int i;
554 int burst_len;
555 int trans_done = 0;
556 unsigned int stat = *pstat;
557
558 if(host->actual_bus_width != MMC_BUS_WIDTH_4)
559 burst_len = 16;
560 else
561 burst_len = 64;
562
563 /* This is unfortunately required */
564 dev_dbg(mmc_dev(host->mmc), "imxmci_cpu_driven_data running STATUS = 0x%x\n",
565 stat);
566
567 udelay(20); /* required for clocks < 8MHz*/
568
569 if(host->dma_dir == DMA_FROM_DEVICE) {
570 imxmci_busy_wait_for_status(host, &stat,
571 STATUS_APPL_BUFF_FF | STATUS_DATA_TRANS_DONE |
572 STATUS_TIME_OUT_READ,
573 50, "imxmci_cpu_driven_data read");
574
575 while((stat & (STATUS_APPL_BUFF_FF | STATUS_DATA_TRANS_DONE)) &&
576 !(stat & STATUS_TIME_OUT_READ) &&
577 (host->data_cnt < 512)) {
578
579 udelay(20); /* required for clocks < 8MHz*/
580
581 for(i = burst_len; i>=2 ; i-=2) {
582 u16 data;
583 data = MMC_BUFFER_ACCESS;
584 udelay(10); /* required for clocks < 8MHz*/
585 if(host->data_cnt+2 <= host->dma_size) {
586 *(host->data_ptr++) = data;
587 } else {
588 if(host->data_cnt < host->dma_size)
589 *(u8*)(host->data_ptr) = data;
590 }
591 host->data_cnt += 2;
592 }
593
594 stat = MMC_STATUS;
595
596 dev_dbg(mmc_dev(host->mmc), "imxmci_cpu_driven_data read %d burst %d STATUS = 0x%x\n",
597 host->data_cnt, burst_len, stat);
598 }
599
600 if((stat & STATUS_DATA_TRANS_DONE) && (host->data_cnt >= 512))
601 trans_done = 1;
602
603 if(host->dma_size & 0x1ff)
604 stat &= ~STATUS_CRC_READ_ERR;
605
606 if(stat & STATUS_TIME_OUT_READ) {
607 dev_dbg(mmc_dev(host->mmc), "imxmci_cpu_driven_data read timeout STATUS = 0x%x\n",
608 stat);
609 trans_done = -1;
610 }
611
612 } else {
613 imxmci_busy_wait_for_status(host, &stat,
614 STATUS_APPL_BUFF_FE,
615 20, "imxmci_cpu_driven_data write");
616
617 while((stat & STATUS_APPL_BUFF_FE) &&
618 (host->data_cnt < host->dma_size)) {
619 if(burst_len >= host->dma_size - host->data_cnt) {
620 burst_len = host->dma_size - host->data_cnt;
621 host->data_cnt = host->dma_size;
622 trans_done = 1;
623 } else {
624 host->data_cnt += burst_len;
625 }
626
627 for(i = burst_len; i>0 ; i-=2)
628 MMC_BUFFER_ACCESS = *(host->data_ptr++);
629
630 stat = MMC_STATUS;
631
632 dev_dbg(mmc_dev(host->mmc), "imxmci_cpu_driven_data write burst %d STATUS = 0x%x\n",
633 burst_len, stat);
634 }
635 }
636
637 *pstat = stat;
638
639 return trans_done;
640 }
641
642 static void imxmci_dma_irq(int dma, void *devid)
643 {
644 struct imxmci_host *host = devid;
645 uint32_t stat = MMC_STATUS;
646
647 atomic_set(&host->stuck_timeout, 0);
648 host->status_reg = stat;
649 set_bit(IMXMCI_PEND_DMA_END_b, &host->pending_events);
650 tasklet_schedule(&host->tasklet);
651 }
652
653 static irqreturn_t imxmci_irq(int irq, void *devid)
654 {
655 struct imxmci_host *host = devid;
656 uint32_t stat = MMC_STATUS;
657 int handled = 1;
658
659 MMC_INT_MASK = host->imask | INT_MASK_SDIO | INT_MASK_AUTO_CARD_DETECT;
660
661 atomic_set(&host->stuck_timeout, 0);
662 host->status_reg = stat;
663 set_bit(IMXMCI_PEND_IRQ_b, &host->pending_events);
664 set_bit(IMXMCI_PEND_STARTED_b, &host->pending_events);
665 tasklet_schedule(&host->tasklet);
666
667 return IRQ_RETVAL(handled);;
668 }
669
670 static void imxmci_tasklet_fnc(unsigned long data)
671 {
672 struct imxmci_host *host = (struct imxmci_host *)data;
673 u32 stat;
674 unsigned int data_dir_mask = 0; /* STATUS_WR_CRC_ERROR_CODE_MASK */
675 int timeout = 0;
676
677 if(atomic_read(&host->stuck_timeout) > 4) {
678 char *what;
679 timeout = 1;
680 stat = MMC_STATUS;
681 host->status_reg = stat;
682 if (test_bit(IMXMCI_PEND_WAIT_RESP_b, &host->pending_events))
683 if (test_bit(IMXMCI_PEND_DMA_DATA_b, &host->pending_events))
684 what = "RESP+DMA";
685 else
686 what = "RESP";
687 else
688 if (test_bit(IMXMCI_PEND_DMA_DATA_b, &host->pending_events))
689 if(test_bit(IMXMCI_PEND_DMA_END_b, &host->pending_events))
690 what = "DATA";
691 else
692 what = "DMA";
693 else
694 what = "???";
695
696 dev_err(mmc_dev(host->mmc), "%s TIMEOUT, hardware stucked STATUS = 0x%04x IMASK = 0x%04x\n",
697 what, stat, MMC_INT_MASK);
698 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",
699 MMC_CMD_DAT_CONT, MMC_BLK_LEN, MMC_NOB, CCR(host->dma));
700 dev_err(mmc_dev(host->mmc), "CMD%d, prevCMD%d, bus %d-bit, dma_size = 0x%x\n",
701 host->cmd?host->cmd->opcode:0, host->prev_cmd_code, 1<<host->actual_bus_width, host->dma_size);
702 }
703
704 if(!host->present || timeout)
705 host->status_reg = STATUS_TIME_OUT_RESP | STATUS_TIME_OUT_READ |
706 STATUS_CRC_READ_ERR | STATUS_CRC_WRITE_ERR;
707
708 if(test_bit(IMXMCI_PEND_IRQ_b, &host->pending_events) || timeout) {
709 clear_bit(IMXMCI_PEND_IRQ_b, &host->pending_events);
710
711 stat = MMC_STATUS;
712 /*
713 * This is not required in theory, but there is chance to miss some flag
714 * which clears automatically by mask write, FreeScale original code keeps
715 * stat from IRQ time so do I
716 */
717 stat |= host->status_reg;
718
719 if(test_bit(IMXMCI_PEND_CPU_DATA_b, &host->pending_events))
720 stat &= ~STATUS_CRC_READ_ERR;
721
722 if(test_bit(IMXMCI_PEND_WAIT_RESP_b, &host->pending_events)) {
723 imxmci_busy_wait_for_status(host, &stat,
724 STATUS_END_CMD_RESP | STATUS_ERR_MASK,
725 20, "imxmci_tasklet_fnc resp (ERRATUM #4)");
726 }
727
728 if(stat & (STATUS_END_CMD_RESP | STATUS_ERR_MASK)) {
729 if(test_and_clear_bit(IMXMCI_PEND_WAIT_RESP_b, &host->pending_events))
730 imxmci_cmd_done(host, stat);
731 if(host->data && (stat & STATUS_ERR_MASK))
732 imxmci_data_done(host, stat);
733 }
734
735 if(test_bit(IMXMCI_PEND_CPU_DATA_b, &host->pending_events)) {
736 stat |= MMC_STATUS;
737 if(imxmci_cpu_driven_data(host, &stat)){
738 if(test_and_clear_bit(IMXMCI_PEND_WAIT_RESP_b, &host->pending_events))
739 imxmci_cmd_done(host, stat);
740 atomic_clear_mask(IMXMCI_PEND_IRQ_m|IMXMCI_PEND_CPU_DATA_m,
741 &host->pending_events);
742 imxmci_data_done(host, stat);
743 }
744 }
745 }
746
747 if(test_bit(IMXMCI_PEND_DMA_END_b, &host->pending_events) &&
748 !test_bit(IMXMCI_PEND_WAIT_RESP_b, &host->pending_events)) {
749
750 stat = MMC_STATUS;
751 /* Same as above */
752 stat |= host->status_reg;
753
754 if(host->dma_dir == DMA_TO_DEVICE) {
755 data_dir_mask = STATUS_WRITE_OP_DONE;
756 } else {
757 data_dir_mask = STATUS_DATA_TRANS_DONE;
758 }
759
760 if(stat & data_dir_mask) {
761 clear_bit(IMXMCI_PEND_DMA_END_b, &host->pending_events);
762 imxmci_data_done(host, stat);
763 }
764 }
765
766 if(test_and_clear_bit(IMXMCI_PEND_CARD_XCHG_b, &host->pending_events)) {
767
768 if(host->cmd)
769 imxmci_cmd_done(host, STATUS_TIME_OUT_RESP);
770
771 if(host->data)
772 imxmci_data_done(host, STATUS_TIME_OUT_READ |
773 STATUS_CRC_READ_ERR | STATUS_CRC_WRITE_ERR);
774
775 if(host->req)
776 imxmci_finish_request(host, host->req);
777
778 mmc_detect_change(host->mmc, msecs_to_jiffies(100));
779
780 }
781 }
782
783 static void imxmci_request(struct mmc_host *mmc, struct mmc_request *req)
784 {
785 struct imxmci_host *host = mmc_priv(mmc);
786 unsigned int cmdat;
787
788 WARN_ON(host->req != NULL);
789
790 host->req = req;
791
792 cmdat = 0;
793
794 if (req->data) {
795 imxmci_setup_data(host, req->data);
796
797 cmdat |= CMD_DAT_CONT_DATA_ENABLE;
798
799 if (req->data->flags & MMC_DATA_WRITE)
800 cmdat |= CMD_DAT_CONT_WRITE;
801
802 if (req->data->flags & MMC_DATA_STREAM) {
803 cmdat |= CMD_DAT_CONT_STREAM_BLOCK;
804 }
805 }
806
807 imxmci_start_cmd(host, req->cmd, cmdat);
808 }
809
810 #define CLK_RATE 19200000
811
812 static void imxmci_set_ios(struct mmc_host *mmc, struct mmc_ios *ios)
813 {
814 struct imxmci_host *host = mmc_priv(mmc);
815 int prescaler;
816
817 if( ios->bus_width==MMC_BUS_WIDTH_4 ) {
818 host->actual_bus_width = MMC_BUS_WIDTH_4;
819 imx_gpio_mode(PB11_PF_SD_DAT3);
820 }else{
821 host->actual_bus_width = MMC_BUS_WIDTH_1;
822 imx_gpio_mode(GPIO_PORTB | GPIO_IN | GPIO_PUEN | 11);
823 }
824
825 if ( host->power_mode != ios->power_mode ) {
826 switch (ios->power_mode) {
827 case MMC_POWER_OFF:
828 break;
829 case MMC_POWER_UP:
830 set_bit(IMXMCI_PEND_SET_INIT_b, &host->pending_events);
831 break;
832 case MMC_POWER_ON:
833 break;
834 }
835 host->power_mode = ios->power_mode;
836 }
837
838 if ( ios->clock ) {
839 unsigned int clk;
840
841 /* The prescaler is 5 for PERCLK2 equal to 96MHz
842 * then 96MHz / 5 = 19.2 MHz
843 */
844 clk=imx_get_perclk2();
845 prescaler=(clk+(CLK_RATE*7)/8)/CLK_RATE;
846 switch(prescaler) {
847 case 0:
848 case 1: prescaler = 0;
849 break;
850 case 2: prescaler = 1;
851 break;
852 case 3: prescaler = 2;
853 break;
854 case 4: prescaler = 4;
855 break;
856 default:
857 case 5: prescaler = 5;
858 break;
859 }
860
861 dev_dbg(mmc_dev(host->mmc), "PERCLK2 %d MHz -> prescaler %d\n",
862 clk, prescaler);
863
864 for(clk=0; clk<8; clk++) {
865 int x;
866 x = CLK_RATE / (1<<clk);
867 if( x <= ios->clock)
868 break;
869 }
870
871 MMC_STR_STP_CLK |= STR_STP_CLK_ENABLE; /* enable controller */
872
873 imxmci_stop_clock(host);
874 MMC_CLK_RATE = (prescaler<<3) | clk;
875 /*
876 * Under my understanding, clock should not be started there, because it would
877 * initiate SDHC sequencer and send last or random command into card
878 */
879 /*imxmci_start_clock(host);*/
880
881 dev_dbg(mmc_dev(host->mmc), "MMC_CLK_RATE: 0x%08x\n", MMC_CLK_RATE);
882 } else {
883 imxmci_stop_clock(host);
884 }
885 }
886
887 static const struct mmc_host_ops imxmci_ops = {
888 .request = imxmci_request,
889 .set_ios = imxmci_set_ios,
890 };
891
892 static struct resource *platform_device_resource(struct platform_device *dev, unsigned int mask, int nr)
893 {
894 int i;
895
896 for (i = 0; i < dev->num_resources; i++)
897 if (dev->resource[i].flags == mask && nr-- == 0)
898 return &dev->resource[i];
899 return NULL;
900 }
901
902 static int platform_device_irq(struct platform_device *dev, int nr)
903 {
904 int i;
905
906 for (i = 0; i < dev->num_resources; i++)
907 if (dev->resource[i].flags == IORESOURCE_IRQ && nr-- == 0)
908 return dev->resource[i].start;
909 return NO_IRQ;
910 }
911
912 static void imxmci_check_status(unsigned long data)
913 {
914 struct imxmci_host *host = (struct imxmci_host *)data;
915
916 if( host->pdata->card_present() != host->present ) {
917 host->present ^= 1;
918 dev_info(mmc_dev(host->mmc), "card %s\n",
919 host->present ? "inserted" : "removed");
920
921 set_bit(IMXMCI_PEND_CARD_XCHG_b, &host->pending_events);
922 tasklet_schedule(&host->tasklet);
923 }
924
925 if(test_bit(IMXMCI_PEND_WAIT_RESP_b, &host->pending_events) ||
926 test_bit(IMXMCI_PEND_DMA_DATA_b, &host->pending_events)) {
927 atomic_inc(&host->stuck_timeout);
928 if(atomic_read(&host->stuck_timeout) > 4)
929 tasklet_schedule(&host->tasklet);
930 } else {
931 atomic_set(&host->stuck_timeout, 0);
932
933 }
934
935 mod_timer(&host->timer, jiffies + (HZ>>1));
936 }
937
938 static int imxmci_probe(struct platform_device *pdev)
939 {
940 struct mmc_host *mmc;
941 struct imxmci_host *host = NULL;
942 struct resource *r;
943 int ret = 0, irq;
944
945 printk(KERN_INFO "i.MX mmc driver\n");
946
947 r = platform_device_resource(pdev, IORESOURCE_MEM, 0);
948 irq = platform_device_irq(pdev, 0);
949 if (!r || irq == NO_IRQ)
950 return -ENXIO;
951
952 r = request_mem_region(r->start, 0x100, "IMXMCI");
953 if (!r)
954 return -EBUSY;
955
956 mmc = mmc_alloc_host(sizeof(struct imxmci_host), &pdev->dev);
957 if (!mmc) {
958 ret = -ENOMEM;
959 goto out;
960 }
961
962 mmc->ops = &imxmci_ops;
963 mmc->f_min = 150000;
964 mmc->f_max = CLK_RATE/2;
965 mmc->ocr_avail = MMC_VDD_32_33;
966 mmc->caps = MMC_CAP_4_BIT_DATA | MMC_CAP_BYTEBLOCK;
967
968 /* MMC core transfer sizes tunable parameters */
969 mmc->max_hw_segs = 64;
970 mmc->max_phys_segs = 64;
971 mmc->max_seg_size = 64*512; /* default PAGE_CACHE_SIZE */
972 mmc->max_req_size = 64*512; /* default PAGE_CACHE_SIZE */
973 mmc->max_blk_size = 2048;
974 mmc->max_blk_count = 65535;
975
976 host = mmc_priv(mmc);
977 host->mmc = mmc;
978 host->dma_allocated = 0;
979 host->pdata = pdev->dev.platform_data;
980
981 spin_lock_init(&host->lock);
982 host->res = r;
983 host->irq = irq;
984
985 imx_gpio_mode(PB8_PF_SD_DAT0);
986 imx_gpio_mode(PB9_PF_SD_DAT1);
987 imx_gpio_mode(PB10_PF_SD_DAT2);
988 /* Configured as GPIO with pull-up to ensure right MCC card mode */
989 /* Switched to PB11_PF_SD_DAT3 if 4 bit bus is configured */
990 imx_gpio_mode(GPIO_PORTB | GPIO_IN | GPIO_PUEN | 11);
991 /* imx_gpio_mode(PB11_PF_SD_DAT3); */
992 imx_gpio_mode(PB12_PF_SD_CLK);
993 imx_gpio_mode(PB13_PF_SD_CMD);
994
995 imxmci_softreset();
996
997 if ( MMC_REV_NO != 0x390 ) {
998 dev_err(mmc_dev(host->mmc), "wrong rev.no. 0x%08x. aborting.\n",
999 MMC_REV_NO);
1000 goto out;
1001 }
1002
1003 MMC_READ_TO = 0x2db4; /* recommended in data sheet */
1004
1005 host->imask = IMXMCI_INT_MASK_DEFAULT;
1006 MMC_INT_MASK = host->imask;
1007
1008
1009 if(imx_dma_request_by_prio(&host->dma, DRIVER_NAME, DMA_PRIO_LOW)<0){
1010 dev_err(mmc_dev(host->mmc), "imx_dma_request_by_prio failed\n");
1011 ret = -EBUSY;
1012 goto out;
1013 }
1014 host->dma_allocated=1;
1015 imx_dma_setup_handlers(host->dma, imxmci_dma_irq, NULL, host);
1016
1017 tasklet_init(&host->tasklet, imxmci_tasklet_fnc, (unsigned long)host);
1018 host->status_reg=0;
1019 host->pending_events=0;
1020
1021 ret = request_irq(host->irq, imxmci_irq, 0, DRIVER_NAME, host);
1022 if (ret)
1023 goto out;
1024
1025 host->present = host->pdata->card_present();
1026 init_timer(&host->timer);
1027 host->timer.data = (unsigned long)host;
1028 host->timer.function = imxmci_check_status;
1029 add_timer(&host->timer);
1030 mod_timer(&host->timer, jiffies + (HZ>>1));
1031
1032 platform_set_drvdata(pdev, mmc);
1033
1034 mmc_add_host(mmc);
1035
1036 return 0;
1037
1038 out:
1039 if (host) {
1040 if(host->dma_allocated){
1041 imx_dma_free(host->dma);
1042 host->dma_allocated=0;
1043 }
1044 }
1045 if (mmc)
1046 mmc_free_host(mmc);
1047 release_resource(r);
1048 return ret;
1049 }
1050
1051 static int imxmci_remove(struct platform_device *pdev)
1052 {
1053 struct mmc_host *mmc = platform_get_drvdata(pdev);
1054
1055 platform_set_drvdata(pdev, NULL);
1056
1057 if (mmc) {
1058 struct imxmci_host *host = mmc_priv(mmc);
1059
1060 tasklet_disable(&host->tasklet);
1061
1062 del_timer_sync(&host->timer);
1063 mmc_remove_host(mmc);
1064
1065 free_irq(host->irq, host);
1066 if(host->dma_allocated){
1067 imx_dma_free(host->dma);
1068 host->dma_allocated=0;
1069 }
1070
1071 tasklet_kill(&host->tasklet);
1072
1073 release_resource(host->res);
1074
1075 mmc_free_host(mmc);
1076 }
1077 return 0;
1078 }
1079
1080 #ifdef CONFIG_PM
1081 static int imxmci_suspend(struct platform_device *dev, pm_message_t state)
1082 {
1083 struct mmc_host *mmc = platform_get_drvdata(dev);
1084 int ret = 0;
1085
1086 if (mmc)
1087 ret = mmc_suspend_host(mmc, state);
1088
1089 return ret;
1090 }
1091
1092 static int imxmci_resume(struct platform_device *dev)
1093 {
1094 struct mmc_host *mmc = platform_get_drvdata(dev);
1095 struct imxmci_host *host;
1096 int ret = 0;
1097
1098 if (mmc) {
1099 host = mmc_priv(mmc);
1100 if(host)
1101 set_bit(IMXMCI_PEND_SET_INIT_b, &host->pending_events);
1102 ret = mmc_resume_host(mmc);
1103 }
1104
1105 return ret;
1106 }
1107 #else
1108 #define imxmci_suspend NULL
1109 #define imxmci_resume NULL
1110 #endif /* CONFIG_PM */
1111
1112 static struct platform_driver imxmci_driver = {
1113 .probe = imxmci_probe,
1114 .remove = imxmci_remove,
1115 .suspend = imxmci_suspend,
1116 .resume = imxmci_resume,
1117 .driver = {
1118 .name = DRIVER_NAME,
1119 }
1120 };
1121
1122 static int __init imxmci_init(void)
1123 {
1124 return platform_driver_register(&imxmci_driver);
1125 }
1126
1127 static void __exit imxmci_exit(void)
1128 {
1129 platform_driver_unregister(&imxmci_driver);
1130 }
1131
1132 module_init(imxmci_init);
1133 module_exit(imxmci_exit);
1134
1135 MODULE_DESCRIPTION("i.MX Multimedia Card Interface Driver");
1136 MODULE_AUTHOR("Sascha Hauer, Pengutronix");
1137 MODULE_LICENSE("GPL");
MOXA 2.6.9 from sdlinux-moxaart.tgz