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 */
14
15 #include <linux/module.h>
16 #include <linux/init.h>
17 #include <linux/ioport.h>
18 #include <linux/platform_device.h>
19 #include <linux/interrupt.h>
20 #include <linux/blkdev.h>
21 #include <linux/dma-mapping.h>
22 #include <linux/mmc/host.h>
23 #include <linux/mmc/card.h>
24 #include <linux/delay.h>
25 #include <linux/clk.h>
26 #include <linux/io.h>
27
28 #include <asm/dma.h>
29 #include <asm/irq.h>
30 #include <asm/sizes.h>
31 #include <mach/mmc.h>
32 #include <mach/imx-dma.h>
33
34 #include "imxmmc.h"
35
36 #define DRIVER_NAME "imx-mmc"
37
38 #define IMXMCI_INT_MASK_DEFAULT (INT_MASK_BUF_READY | INT_MASK_DATA_TRAN | \
39 INT_MASK_WRITE_OP_DONE | INT_MASK_END_CMD_RES | \
40 INT_MASK_AUTO_CARD_DETECT | INT_MASK_DAT0_EN | INT_MASK_SDIO)
41
42 struct imxmci_host {
43 struct mmc_host *mmc;
44 spinlock_t lock;
45 struct resource *res;
46 void __iomem *base;
47 int irq;
48 imx_dmach_t dma;
49 volatile unsigned int imask;
50 unsigned int power_mode;
51 unsigned int present;
52 struct imxmmc_platform_data *pdata;
53
54 struct mmc_request *req;
55 struct mmc_command *cmd;
56 struct mmc_data *data;
57
58 struct timer_list timer;
59 struct tasklet_struct tasklet;
60 unsigned int status_reg;
61 unsigned long pending_events;
62 /* Next two fields are there for CPU driven transfers to overcome SDHC deficiencies */
63 u16 *data_ptr;
64 unsigned int data_cnt;
65 atomic_t stuck_timeout;
66
67 unsigned int dma_nents;
68 unsigned int dma_size;
69 unsigned int dma_dir;
70 int dma_allocated;
71
72 unsigned char actual_bus_width;
73
74 int prev_cmd_code;
75
76 struct clk *clk;
77 };
78
79 #define IMXMCI_PEND_IRQ_b 0
80 #define IMXMCI_PEND_DMA_END_b 1
81 #define IMXMCI_PEND_DMA_ERR_b 2
82 #define IMXMCI_PEND_WAIT_RESP_b 3
83 #define IMXMCI_PEND_DMA_DATA_b 4
84 #define IMXMCI_PEND_CPU_DATA_b 5
85 #define IMXMCI_PEND_CARD_XCHG_b 6
86 #define IMXMCI_PEND_SET_INIT_b 7
87 #define IMXMCI_PEND_STARTED_b 8
88
89 #define IMXMCI_PEND_IRQ_m (1 << IMXMCI_PEND_IRQ_b)
90 #define IMXMCI_PEND_DMA_END_m (1 << IMXMCI_PEND_DMA_END_b)
91 #define IMXMCI_PEND_DMA_ERR_m (1 << IMXMCI_PEND_DMA_ERR_b)
92 #define IMXMCI_PEND_WAIT_RESP_m (1 << IMXMCI_PEND_WAIT_RESP_b)
93 #define IMXMCI_PEND_DMA_DATA_m (1 << IMXMCI_PEND_DMA_DATA_b)
94 #define IMXMCI_PEND_CPU_DATA_m (1 << IMXMCI_PEND_CPU_DATA_b)
95 #define IMXMCI_PEND_CARD_XCHG_m (1 << IMXMCI_PEND_CARD_XCHG_b)
96 #define IMXMCI_PEND_SET_INIT_m (1 << IMXMCI_PEND_SET_INIT_b)
97 #define IMXMCI_PEND_STARTED_m (1 << IMXMCI_PEND_STARTED_b)
98
imxmci_stop_clock(struct imxmci_host * host)99 static void imxmci_stop_clock(struct imxmci_host *host)
100 {
101 int i = 0;
102 u16 reg;
103
104 reg = readw(host->base + MMC_REG_STR_STP_CLK);
105 writew(reg & ~STR_STP_CLK_START_CLK, host->base + MMC_REG_STR_STP_CLK);
106 while (i < 0x1000) {
107 if (!(i & 0x7f)) {
108 reg = readw(host->base + MMC_REG_STR_STP_CLK);
109 writew(reg | STR_STP_CLK_STOP_CLK,
110 host->base + MMC_REG_STR_STP_CLK);
111 }
112
113 reg = readw(host->base + MMC_REG_STATUS);
114 if (!(reg & STATUS_CARD_BUS_CLK_RUN)) {
115 /* Check twice before cut */
116 reg = readw(host->base + MMC_REG_STATUS);
117 if (!(reg & STATUS_CARD_BUS_CLK_RUN))
118 return;
119 }
120
121 i++;
122 }
123 dev_dbg(mmc_dev(host->mmc), "imxmci_stop_clock blocked, no luck\n");
124 }
125
imxmci_start_clock(struct imxmci_host * host)126 static int imxmci_start_clock(struct imxmci_host *host)
127 {
128 unsigned int trials = 0;
129 unsigned int delay_limit = 128;
130 unsigned long flags;
131 u16 reg;
132
133 reg = readw(host->base + MMC_REG_STR_STP_CLK);
134 writew(reg & ~STR_STP_CLK_STOP_CLK, host->base + MMC_REG_STR_STP_CLK);
135
136 clear_bit(IMXMCI_PEND_STARTED_b, &host->pending_events);
137
138 /*
139 * Command start of the clock, this usually succeeds in less
140 * then 6 delay loops, but during card detection (low clockrate)
141 * it takes up to 5000 delay loops and sometimes fails for the first time
142 */
143 reg = readw(host->base + MMC_REG_STR_STP_CLK);
144 writew(reg | STR_STP_CLK_START_CLK, host->base + MMC_REG_STR_STP_CLK);
145
146 do {
147 unsigned int delay = delay_limit;
148
149 while (delay--) {
150 reg = readw(host->base + MMC_REG_STATUS);
151 if (reg & STATUS_CARD_BUS_CLK_RUN) {
152 /* Check twice before cut */
153 reg = readw(host->base + MMC_REG_STATUS);
154 if (reg & STATUS_CARD_BUS_CLK_RUN)
155 return 0;
156 }
157
158 if (test_bit(IMXMCI_PEND_STARTED_b, &host->pending_events))
159 return 0;
160 }
161
162 local_irq_save(flags);
163 /*
164 * Ensure, that request is not doubled under all possible circumstances.
165 * It is possible, that cock running state is missed, because some other
166 * IRQ or schedule delays this function execution and the clocks has
167 * been already stopped by other means (response processing, SDHC HW)
168 */
169 if (!test_bit(IMXMCI_PEND_STARTED_b, &host->pending_events)) {
170 reg = readw(host->base + MMC_REG_STR_STP_CLK);
171 writew(reg | STR_STP_CLK_START_CLK,
172 host->base + MMC_REG_STR_STP_CLK);
173 }
174 local_irq_restore(flags);
175
176 } while (++trials < 256);
177
178 dev_err(mmc_dev(host->mmc), "imxmci_start_clock blocked, no luck\n");
179
180 return -1;
181 }
182
imxmci_softreset(struct imxmci_host * host)183 static void imxmci_softreset(struct imxmci_host *host)
184 {
185 int i;
186
187 /* reset sequence */
188 writew(0x08, host->base + MMC_REG_STR_STP_CLK);
189 writew(0x0D, host->base + MMC_REG_STR_STP_CLK);
190
191 for (i = 0; i < 8; i++)
192 writew(0x05, host->base + MMC_REG_STR_STP_CLK);
193
194 writew(0xff, host->base + MMC_REG_RES_TO);
195 writew(512, host->base + MMC_REG_BLK_LEN);
196 writew(1, host->base + MMC_REG_NOB);
197 }
198
imxmci_busy_wait_for_status(struct imxmci_host * host,unsigned int * pstat,unsigned int stat_mask,int timeout,const char * where)199 static int imxmci_busy_wait_for_status(struct imxmci_host *host,
200 unsigned int *pstat, unsigned int stat_mask,
201 int timeout, const char *where)
202 {
203 int loops = 0;
204
205 while (!(*pstat & stat_mask)) {
206 loops += 2;
207 if (loops >= timeout) {
208 dev_dbg(mmc_dev(host->mmc), "busy wait timeout in %s, STATUS = 0x%x (0x%x)\n",
209 where, *pstat, stat_mask);
210 return -1;
211 }
212 udelay(2);
213 *pstat |= readw(host->base + MMC_REG_STATUS);
214 }
215 if (!loops)
216 return 0;
217
218 /* The busy-wait is expected there for clock <8MHz due to SDHC hardware flaws */
219 if (!(stat_mask & STATUS_END_CMD_RESP) || (host->mmc->ios.clock >= 8000000))
220 dev_info(mmc_dev(host->mmc), "busy wait for %d usec in %s, STATUS = 0x%x (0x%x)\n",
221 loops, where, *pstat, stat_mask);
222 return loops;
223 }
224
imxmci_setup_data(struct imxmci_host * host,struct mmc_data * data)225 static void imxmci_setup_data(struct imxmci_host *host, struct mmc_data *data)
226 {
227 unsigned int nob = data->blocks;
228 unsigned int blksz = data->blksz;
229 unsigned int datasz = nob * blksz;
230 int i;
231
232 if (data->flags & MMC_DATA_STREAM)
233 nob = 0xffff;
234
235 host->data = data;
236 data->bytes_xfered = 0;
237
238 writew(nob, host->base + MMC_REG_NOB);
239 writew(blksz, host->base + MMC_REG_BLK_LEN);
240
241 /*
242 * DMA cannot be used for small block sizes, we have to use CPU driven transfers otherwise.
243 * We are in big troubles for non-512 byte transfers according to note in the paragraph
244 * 20.6.7 of User Manual anyway, but we need to be able to transfer SCR at least.
245 * The situation is even more complex in reality. The SDHC in not able to handle wll
246 * partial FIFO fills and reads. The length has to be rounded up to burst size multiple.
247 * This is required for SCR read at least.
248 */
249 if (datasz < 512) {
250 host->dma_size = datasz;
251 if (data->flags & MMC_DATA_READ) {
252 host->dma_dir = DMA_FROM_DEVICE;
253
254 /* Hack to enable read SCR */
255 writew(1, host->base + MMC_REG_NOB);
256 writew(512, host->base + MMC_REG_BLK_LEN);
257 } else {
258 host->dma_dir = DMA_TO_DEVICE;
259 }
260
261 /* Convert back to virtual address */
262 host->data_ptr = (u16 *)sg_virt(data->sg);
263 host->data_cnt = 0;
264
265 clear_bit(IMXMCI_PEND_DMA_DATA_b, &host->pending_events);
266 set_bit(IMXMCI_PEND_CPU_DATA_b, &host->pending_events);
267
268 return;
269 }
270
271 if (data->flags & MMC_DATA_READ) {
272 host->dma_dir = DMA_FROM_DEVICE;
273 host->dma_nents = dma_map_sg(mmc_dev(host->mmc), data->sg,
274 data->sg_len, host->dma_dir);
275
276 imx_dma_setup_sg(host->dma, data->sg, data->sg_len, datasz,
277 host->res->start + MMC_REG_BUFFER_ACCESS,
278 DMA_MODE_READ);
279
280 /*imx_dma_setup_mem2dev_ccr(host->dma, DMA_MODE_READ, IMX_DMA_WIDTH_16, CCR_REN);*/
281 CCR(host->dma) = CCR_DMOD_LINEAR | CCR_DSIZ_32 | CCR_SMOD_FIFO | CCR_SSIZ_16 | CCR_REN;
282 } else {
283 host->dma_dir = DMA_TO_DEVICE;
284
285 host->dma_nents = dma_map_sg(mmc_dev(host->mmc), data->sg,
286 data->sg_len, host->dma_dir);
287
288 imx_dma_setup_sg(host->dma, data->sg, data->sg_len, datasz,
289 host->res->start + MMC_REG_BUFFER_ACCESS,
290 DMA_MODE_WRITE);
291
292 /*imx_dma_setup_mem2dev_ccr(host->dma, DMA_MODE_WRITE, IMX_DMA_WIDTH_16, CCR_REN);*/
293 CCR(host->dma) = CCR_SMOD_LINEAR | CCR_SSIZ_32 | CCR_DMOD_FIFO | CCR_DSIZ_16 | CCR_REN;
294 }
295
296 #if 1 /* This code is there only for consistency checking and can be disabled in future */
297 host->dma_size = 0;
298 for (i = 0; i < host->dma_nents; i++)
299 host->dma_size += data->sg[i].length;
300
301 if (datasz > host->dma_size) {
302 dev_err(mmc_dev(host->mmc), "imxmci_setup_data datasz 0x%x > 0x%x dm_size\n",
303 datasz, host->dma_size);
304 }
305 #endif
306
307 host->dma_size = datasz;
308
309 wmb();
310
311 set_bit(IMXMCI_PEND_DMA_DATA_b, &host->pending_events);
312 clear_bit(IMXMCI_PEND_CPU_DATA_b, &host->pending_events);
313
314 /* start DMA engine for read, write is delayed after initial response */
315 if (host->dma_dir == DMA_FROM_DEVICE)
316 imx_dma_enable(host->dma);
317 }
318
imxmci_start_cmd(struct imxmci_host * host,struct mmc_command * cmd,unsigned int cmdat)319 static void imxmci_start_cmd(struct imxmci_host *host, struct mmc_command *cmd, unsigned int cmdat)
320 {
321 unsigned long flags;
322 u32 imask;
323
324 WARN_ON(host->cmd != NULL);
325 host->cmd = cmd;
326
327 /* Ensure, that clock are stopped else command programming and start fails */
328 imxmci_stop_clock(host);
329
330 if (cmd->flags & MMC_RSP_BUSY)
331 cmdat |= CMD_DAT_CONT_BUSY;
332
333 switch (mmc_resp_type(cmd)) {
334 case MMC_RSP_R1: /* short CRC, OPCODE */
335 case MMC_RSP_R1B:/* short CRC, OPCODE, BUSY */
336 cmdat |= CMD_DAT_CONT_RESPONSE_FORMAT_R1;
337 break;
338 case MMC_RSP_R2: /* long 136 bit + CRC */
339 cmdat |= CMD_DAT_CONT_RESPONSE_FORMAT_R2;
340 break;
341 case MMC_RSP_R3: /* short */
342 cmdat |= CMD_DAT_CONT_RESPONSE_FORMAT_R3;
343 break;
344 default:
345 break;
346 }
347
348 if (test_and_clear_bit(IMXMCI_PEND_SET_INIT_b, &host->pending_events))
349 cmdat |= CMD_DAT_CONT_INIT; /* This command needs init */
350
351 if (host->actual_bus_width == MMC_BUS_WIDTH_4)
352 cmdat |= CMD_DAT_CONT_BUS_WIDTH_4;
353
354 writew(cmd->opcode, host->base + MMC_REG_CMD);
355 writew(cmd->arg >> 16, host->base + MMC_REG_ARGH);
356 writew(cmd->arg & 0xffff, host->base + MMC_REG_ARGL);
357 writew(cmdat, host->base + MMC_REG_CMD_DAT_CONT);
358
359 atomic_set(&host->stuck_timeout, 0);
360 set_bit(IMXMCI_PEND_WAIT_RESP_b, &host->pending_events);
361
362
363 imask = IMXMCI_INT_MASK_DEFAULT;
364 imask &= ~INT_MASK_END_CMD_RES;
365 if (cmdat & CMD_DAT_CONT_DATA_ENABLE) {
366 /* imask &= ~INT_MASK_BUF_READY; */
367 imask &= ~INT_MASK_DATA_TRAN;
368 if (cmdat & CMD_DAT_CONT_WRITE)
369 imask &= ~INT_MASK_WRITE_OP_DONE;
370 if (test_bit(IMXMCI_PEND_CPU_DATA_b, &host->pending_events))
371 imask &= ~INT_MASK_BUF_READY;
372 }
373
374 spin_lock_irqsave(&host->lock, flags);
375 host->imask = imask;
376 writew(host->imask, host->base + MMC_REG_INT_MASK);
377 spin_unlock_irqrestore(&host->lock, flags);
378
379 dev_dbg(mmc_dev(host->mmc), "CMD%02d (0x%02x) mask set to 0x%04x\n",
380 cmd->opcode, cmd->opcode, imask);
381
382 imxmci_start_clock(host);
383 }
384
imxmci_finish_request(struct imxmci_host * host,struct mmc_request * req)385 static void imxmci_finish_request(struct imxmci_host *host, struct mmc_request *req)
386 {
387 unsigned long flags;
388
389 spin_lock_irqsave(&host->lock, flags);
390
391 host->pending_events &= ~(IMXMCI_PEND_WAIT_RESP_m | IMXMCI_PEND_DMA_END_m |
392 IMXMCI_PEND_DMA_DATA_m | IMXMCI_PEND_CPU_DATA_m);
393
394 host->imask = IMXMCI_INT_MASK_DEFAULT;
395 writew(host->imask, host->base + MMC_REG_INT_MASK);
396
397 spin_unlock_irqrestore(&host->lock, flags);
398
399 if (req && req->cmd)
400 host->prev_cmd_code = req->cmd->opcode;
401
402 host->req = NULL;
403 host->cmd = NULL;
404 host->data = NULL;
405 mmc_request_done(host->mmc, req);
406 }
407
imxmci_finish_data(struct imxmci_host * host,unsigned int stat)408 static int imxmci_finish_data(struct imxmci_host *host, unsigned int stat)
409 {
410 struct mmc_data *data = host->data;
411 int data_error;
412
413 if (test_and_clear_bit(IMXMCI_PEND_DMA_DATA_b, &host->pending_events)) {
414 imx_dma_disable(host->dma);
415 dma_unmap_sg(mmc_dev(host->mmc), data->sg, host->dma_nents,
416 host->dma_dir);
417 }
418
419 if (stat & STATUS_ERR_MASK) {
420 dev_dbg(mmc_dev(host->mmc), "request failed. status: 0x%08x\n", stat);
421 if (stat & (STATUS_CRC_READ_ERR | STATUS_CRC_WRITE_ERR))
422 data->error = -EILSEQ;
423 else if (stat & STATUS_TIME_OUT_READ)
424 data->error = -ETIMEDOUT;
425 else
426 data->error = -EIO;
427 } else {
428 data->bytes_xfered = host->dma_size;
429 }
430
431 data_error = data->error;
432
433 host->data = NULL;
434
435 return data_error;
436 }
437
imxmci_cmd_done(struct imxmci_host * host,unsigned int stat)438 static int imxmci_cmd_done(struct imxmci_host *host, unsigned int stat)
439 {
440 struct mmc_command *cmd = host->cmd;
441 int i;
442 u32 a, b, c;
443 struct mmc_data *data = host->data;
444
445 if (!cmd)
446 return 0;
447
448 host->cmd = NULL;
449
450 if (stat & STATUS_TIME_OUT_RESP) {
451 dev_dbg(mmc_dev(host->mmc), "CMD TIMEOUT\n");
452 cmd->error = -ETIMEDOUT;
453 } else if (stat & STATUS_RESP_CRC_ERR && cmd->flags & MMC_RSP_CRC) {
454 dev_dbg(mmc_dev(host->mmc), "cmd crc error\n");
455 cmd->error = -EILSEQ;
456 }
457
458 if (cmd->flags & MMC_RSP_PRESENT) {
459 if (cmd->flags & MMC_RSP_136) {
460 for (i = 0; i < 4; i++) {
461 a = readw(host->base + MMC_REG_RES_FIFO);
462 b = readw(host->base + MMC_REG_RES_FIFO);
463 cmd->resp[i] = a << 16 | b;
464 }
465 } else {
466 a = readw(host->base + MMC_REG_RES_FIFO);
467 b = readw(host->base + MMC_REG_RES_FIFO);
468 c = readw(host->base + MMC_REG_RES_FIFO);
469 cmd->resp[0] = a << 24 | b << 8 | c >> 8;
470 }
471 }
472
473 dev_dbg(mmc_dev(host->mmc), "RESP 0x%08x, 0x%08x, 0x%08x, 0x%08x, error %d\n",
474 cmd->resp[0], cmd->resp[1], cmd->resp[2], cmd->resp[3], cmd->error);
475
476 if (data && !cmd->error && !(stat & STATUS_ERR_MASK)) {
477 if (host->req->data->flags & MMC_DATA_WRITE) {
478
479 /* Wait for FIFO to be empty before starting DMA write */
480
481 stat = readw(host->base + MMC_REG_STATUS);
482 if (imxmci_busy_wait_for_status(host, &stat,
483 STATUS_APPL_BUFF_FE,
484 40, "imxmci_cmd_done DMA WR") < 0) {
485 cmd->error = -EIO;
486 imxmci_finish_data(host, stat);
487 if (host->req)
488 imxmci_finish_request(host, host->req);
489 dev_warn(mmc_dev(host->mmc), "STATUS = 0x%04x\n",
490 stat);
491 return 0;
492 }
493
494 if (test_bit(IMXMCI_PEND_DMA_DATA_b, &host->pending_events))
495 imx_dma_enable(host->dma);
496 }
497 } else {
498 struct mmc_request *req;
499 imxmci_stop_clock(host);
500 req = host->req;
501
502 if (data)
503 imxmci_finish_data(host, stat);
504
505 if (req)
506 imxmci_finish_request(host, req);
507 else
508 dev_warn(mmc_dev(host->mmc), "imxmci_cmd_done: no request to finish\n");
509 }
510
511 return 1;
512 }
513
imxmci_data_done(struct imxmci_host * host,unsigned int stat)514 static int imxmci_data_done(struct imxmci_host *host, unsigned int stat)
515 {
516 struct mmc_data *data = host->data;
517 int data_error;
518
519 if (!data)
520 return 0;
521
522 data_error = imxmci_finish_data(host, stat);
523
524 if (host->req->stop) {
525 imxmci_stop_clock(host);
526 imxmci_start_cmd(host, host->req->stop, 0);
527 } else {
528 struct mmc_request *req;
529 req = host->req;
530 if (req)
531 imxmci_finish_request(host, req);
532 else
533 dev_warn(mmc_dev(host->mmc), "imxmci_data_done: no request to finish\n");
534 }
535
536 return 1;
537 }
538
imxmci_cpu_driven_data(struct imxmci_host * host,unsigned int * pstat)539 static int imxmci_cpu_driven_data(struct imxmci_host *host, unsigned int *pstat)
540 {
541 int i;
542 int burst_len;
543 int trans_done = 0;
544 unsigned int stat = *pstat;
545
546 if (host->actual_bus_width != MMC_BUS_WIDTH_4)
547 burst_len = 16;
548 else
549 burst_len = 64;
550
551 /* This is unfortunately required */
552 dev_dbg(mmc_dev(host->mmc), "imxmci_cpu_driven_data running STATUS = 0x%x\n",
553 stat);
554
555 udelay(20); /* required for clocks < 8MHz*/
556
557 if (host->dma_dir == DMA_FROM_DEVICE) {
558 imxmci_busy_wait_for_status(host, &stat,
559 STATUS_APPL_BUFF_FF | STATUS_DATA_TRANS_DONE |
560 STATUS_TIME_OUT_READ,
561 50, "imxmci_cpu_driven_data read");
562
563 while ((stat & (STATUS_APPL_BUFF_FF | STATUS_DATA_TRANS_DONE)) &&
564 !(stat & STATUS_TIME_OUT_READ) &&
565 (host->data_cnt < 512)) {
566
567 udelay(20); /* required for clocks < 8MHz*/
568
569 for (i = burst_len; i >= 2 ; i -= 2) {
570 u16 data;
571 data = readw(host->base + MMC_REG_BUFFER_ACCESS);
572 udelay(10); /* required for clocks < 8MHz*/
573 if (host->data_cnt+2 <= host->dma_size) {
574 *(host->data_ptr++) = data;
575 } else {
576 if (host->data_cnt < host->dma_size)
577 *(u8 *)(host->data_ptr) = data;
578 }
579 host->data_cnt += 2;
580 }
581
582 stat = readw(host->base + MMC_REG_STATUS);
583
584 dev_dbg(mmc_dev(host->mmc), "imxmci_cpu_driven_data read %d burst %d STATUS = 0x%x\n",
585 host->data_cnt, burst_len, stat);
586 }
587
588 if ((stat & STATUS_DATA_TRANS_DONE) && (host->data_cnt >= 512))
589 trans_done = 1;
590
591 if (host->dma_size & 0x1ff)
592 stat &= ~STATUS_CRC_READ_ERR;
593
594 if (stat & STATUS_TIME_OUT_READ) {
595 dev_dbg(mmc_dev(host->mmc), "imxmci_cpu_driven_data read timeout STATUS = 0x%x\n",
596 stat);
597 trans_done = -1;
598 }
599
600 } else {
601 imxmci_busy_wait_for_status(host, &stat,
602 STATUS_APPL_BUFF_FE,
603 20, "imxmci_cpu_driven_data write");
604
605 while ((stat & STATUS_APPL_BUFF_FE) &&
606 (host->data_cnt < host->dma_size)) {
607 if (burst_len >= host->dma_size - host->data_cnt) {
608 burst_len = host->dma_size - host->data_cnt;
609 host->data_cnt = host->dma_size;
610 trans_done = 1;
611 } else {
612 host->data_cnt += burst_len;
613 }
614
615 for (i = burst_len; i > 0 ; i -= 2)
616 writew(*(host->data_ptr++), host->base + MMC_REG_BUFFER_ACCESS);
617
618 stat = readw(host->base + MMC_REG_STATUS);
619
620 dev_dbg(mmc_dev(host->mmc), "imxmci_cpu_driven_data write burst %d STATUS = 0x%x\n",
621 burst_len, stat);
622 }
623 }
624
625 *pstat = stat;
626
627 return trans_done;
628 }
629
imxmci_dma_irq(int dma,void * devid)630 static void imxmci_dma_irq(int dma, void *devid)
631 {
632 struct imxmci_host *host = devid;
633 u32 stat = readw(host->base + MMC_REG_STATUS);
634
635 atomic_set(&host->stuck_timeout, 0);
636 host->status_reg = stat;
637 set_bit(IMXMCI_PEND_DMA_END_b, &host->pending_events);
638 tasklet_schedule(&host->tasklet);
639 }
640
imxmci_irq(int irq,void * devid)641 static irqreturn_t imxmci_irq(int irq, void *devid)
642 {
643 struct imxmci_host *host = devid;
644 u32 stat = readw(host->base + MMC_REG_STATUS);
645 int handled = 1;
646
647 writew(host->imask | INT_MASK_SDIO | INT_MASK_AUTO_CARD_DETECT,
648 host->base + MMC_REG_INT_MASK);
649
650 atomic_set(&host->stuck_timeout, 0);
651 host->status_reg = stat;
652 set_bit(IMXMCI_PEND_IRQ_b, &host->pending_events);
653 set_bit(IMXMCI_PEND_STARTED_b, &host->pending_events);
654 tasklet_schedule(&host->tasklet);
655
656 return IRQ_RETVAL(handled);
657 }
658
imxmci_tasklet_fnc(unsigned long data)659 static void imxmci_tasklet_fnc(unsigned long data)
660 {
661 struct imxmci_host *host = (struct imxmci_host *)data;
662 u32 stat;
663 unsigned int data_dir_mask = 0; /* STATUS_WR_CRC_ERROR_CODE_MASK */
664 int timeout = 0;
665
666 if (atomic_read(&host->stuck_timeout) > 4) {
667 char *what;
668 timeout = 1;
669 stat = readw(host->base + MMC_REG_STATUS);
670 host->status_reg = stat;
671 if (test_bit(IMXMCI_PEND_WAIT_RESP_b, &host->pending_events))
672 if (test_bit(IMXMCI_PEND_DMA_DATA_b, &host->pending_events))
673 what = "RESP+DMA";
674 else
675 what = "RESP";
676 else
677 if (test_bit(IMXMCI_PEND_DMA_DATA_b, &host->pending_events))
678 if (test_bit(IMXMCI_PEND_DMA_END_b, &host->pending_events))
679 what = "DATA";
680 else
681 what = "DMA";
682 else
683 what = "???";
684
685 dev_err(mmc_dev(host->mmc),
686 "%s TIMEOUT, hardware stucked STATUS = 0x%04x IMASK = 0x%04x\n",
687 what, stat,
688 readw(host->base + MMC_REG_INT_MASK));
689 dev_err(mmc_dev(host->mmc),
690 "CMD_DAT_CONT = 0x%04x, MMC_BLK_LEN = 0x%04x, MMC_NOB = 0x%04x, DMA_CCR = 0x%08x\n",
691 readw(host->base + MMC_REG_CMD_DAT_CONT),
692 readw(host->base + MMC_REG_BLK_LEN),
693 readw(host->base + MMC_REG_NOB),
694 CCR(host->dma));
695 dev_err(mmc_dev(host->mmc), "CMD%d, prevCMD%d, bus %d-bit, dma_size = 0x%x\n",
696 host->cmd ? host->cmd->opcode : 0,
697 host->prev_cmd_code,
698 1 << host->actual_bus_width, host->dma_size);
699 }
700
701 if (!host->present || timeout)
702 host->status_reg = STATUS_TIME_OUT_RESP | STATUS_TIME_OUT_READ |
703 STATUS_CRC_READ_ERR | STATUS_CRC_WRITE_ERR;
704
705 if (test_bit(IMXMCI_PEND_IRQ_b, &host->pending_events) || timeout) {
706 clear_bit(IMXMCI_PEND_IRQ_b, &host->pending_events);
707
708 stat = readw(host->base + MMC_REG_STATUS);
709 /*
710 * This is not required in theory, but there is chance to miss some flag
711 * which clears automatically by mask write, FreeScale original code keeps
712 * stat from IRQ time so do I
713 */
714 stat |= host->status_reg;
715
716 if (test_bit(IMXMCI_PEND_CPU_DATA_b, &host->pending_events))
717 stat &= ~STATUS_CRC_READ_ERR;
718
719 if (test_bit(IMXMCI_PEND_WAIT_RESP_b, &host->pending_events)) {
720 imxmci_busy_wait_for_status(host, &stat,
721 STATUS_END_CMD_RESP | STATUS_ERR_MASK,
722 20, "imxmci_tasklet_fnc resp (ERRATUM #4)");
723 }
724
725 if (stat & (STATUS_END_CMD_RESP | STATUS_ERR_MASK)) {
726 if (test_and_clear_bit(IMXMCI_PEND_WAIT_RESP_b, &host->pending_events))
727 imxmci_cmd_done(host, stat);
728 if (host->data && (stat & STATUS_ERR_MASK))
729 imxmci_data_done(host, stat);
730 }
731
732 if (test_bit(IMXMCI_PEND_CPU_DATA_b, &host->pending_events)) {
733 stat |= readw(host->base + MMC_REG_STATUS);
734 if (imxmci_cpu_driven_data(host, &stat)) {
735 if (test_and_clear_bit(IMXMCI_PEND_WAIT_RESP_b, &host->pending_events))
736 imxmci_cmd_done(host, stat);
737 atomic_clear_mask(IMXMCI_PEND_IRQ_m|IMXMCI_PEND_CPU_DATA_m,
738 &host->pending_events);
739 imxmci_data_done(host, stat);
740 }
741 }
742 }
743
744 if (test_bit(IMXMCI_PEND_DMA_END_b, &host->pending_events) &&
745 !test_bit(IMXMCI_PEND_WAIT_RESP_b, &host->pending_events)) {
746
747 stat = readw(host->base + MMC_REG_STATUS);
748 /* Same as above */
749 stat |= host->status_reg;
750
751 if (host->dma_dir == DMA_TO_DEVICE)
752 data_dir_mask = STATUS_WRITE_OP_DONE;
753 else
754 data_dir_mask = STATUS_DATA_TRANS_DONE;
755
756 if (stat & data_dir_mask) {
757 clear_bit(IMXMCI_PEND_DMA_END_b, &host->pending_events);
758 imxmci_data_done(host, stat);
759 }
760 }
761
762 if (test_and_clear_bit(IMXMCI_PEND_CARD_XCHG_b, &host->pending_events)) {
763
764 if (host->cmd)
765 imxmci_cmd_done(host, STATUS_TIME_OUT_RESP);
766
767 if (host->data)
768 imxmci_data_done(host, STATUS_TIME_OUT_READ |
769 STATUS_CRC_READ_ERR | STATUS_CRC_WRITE_ERR);
770
771 if (host->req)
772 imxmci_finish_request(host, host->req);
773
774 mmc_detect_change(host->mmc, msecs_to_jiffies(100));
775
776 }
777 }
778
imxmci_request(struct mmc_host * mmc,struct mmc_request * req)779 static void imxmci_request(struct mmc_host *mmc, struct mmc_request *req)
780 {
781 struct imxmci_host *host = mmc_priv(mmc);
782 unsigned int cmdat;
783
784 WARN_ON(host->req != NULL);
785
786 host->req = req;
787
788 cmdat = 0;
789
790 if (req->data) {
791 imxmci_setup_data(host, req->data);
792
793 cmdat |= CMD_DAT_CONT_DATA_ENABLE;
794
795 if (req->data->flags & MMC_DATA_WRITE)
796 cmdat |= CMD_DAT_CONT_WRITE;
797
798 if (req->data->flags & MMC_DATA_STREAM)
799 cmdat |= CMD_DAT_CONT_STREAM_BLOCK;
800 }
801
802 imxmci_start_cmd(host, req->cmd, cmdat);
803 }
804
805 #define CLK_RATE 19200000
806
imxmci_set_ios(struct mmc_host * mmc,struct mmc_ios * ios)807 static void imxmci_set_ios(struct mmc_host *mmc, struct mmc_ios *ios)
808 {
809 struct imxmci_host *host = mmc_priv(mmc);
810 int prescaler;
811
812 if (ios->bus_width == MMC_BUS_WIDTH_4) {
813 host->actual_bus_width = MMC_BUS_WIDTH_4;
814 imx_gpio_mode(PB11_PF_SD_DAT3);
815 BLR(host->dma) = 0; /* burst 64 byte read/write */
816 } else {
817 host->actual_bus_width = MMC_BUS_WIDTH_1;
818 imx_gpio_mode(GPIO_PORTB | GPIO_IN | GPIO_PUEN | 11);
819 BLR(host->dma) = 16; /* burst 16 byte read/write */
820 }
821
822 if (host->power_mode != ios->power_mode) {
823 switch (ios->power_mode) {
824 case MMC_POWER_OFF:
825 break;
826 case MMC_POWER_UP:
827 set_bit(IMXMCI_PEND_SET_INIT_b, &host->pending_events);
828 break;
829 case MMC_POWER_ON:
830 break;
831 }
832 host->power_mode = ios->power_mode;
833 }
834
835 if (ios->clock) {
836 unsigned int clk;
837 u16 reg;
838
839 /* The prescaler is 5 for PERCLK2 equal to 96MHz
840 * then 96MHz / 5 = 19.2 MHz
841 */
842 clk = clk_get_rate(host->clk);
843 prescaler = (clk + (CLK_RATE * 7) / 8) / CLK_RATE;
844 switch (prescaler) {
845 case 0:
846 case 1: prescaler = 0;
847 break;
848 case 2: prescaler = 1;
849 break;
850 case 3: prescaler = 2;
851 break;
852 case 4: prescaler = 4;
853 break;
854 default:
855 case 5: prescaler = 5;
856 break;
857 }
858
859 dev_dbg(mmc_dev(host->mmc), "PERCLK2 %d MHz -> prescaler %d\n",
860 clk, prescaler);
861
862 for (clk = 0; clk < 8; clk++) {
863 int x;
864 x = CLK_RATE / (1 << clk);
865 if (x <= ios->clock)
866 break;
867 }
868
869 /* enable controller */
870 reg = readw(host->base + MMC_REG_STR_STP_CLK);
871 writew(reg | STR_STP_CLK_ENABLE,
872 host->base + MMC_REG_STR_STP_CLK);
873
874 imxmci_stop_clock(host);
875 writew((prescaler << 3) | clk, host->base + MMC_REG_CLK_RATE);
876 /*
877 * Under my understanding, clock should not be started there, because it would
878 * initiate SDHC sequencer and send last or random command into card
879 */
880 /* imxmci_start_clock(host); */
881
882 dev_dbg(mmc_dev(host->mmc),
883 "MMC_CLK_RATE: 0x%08x\n",
884 readw(host->base + MMC_REG_CLK_RATE));
885 } else {
886 imxmci_stop_clock(host);
887 }
888 }
889
imxmci_get_ro(struct mmc_host * mmc)890 static int imxmci_get_ro(struct mmc_host *mmc)
891 {
892 struct imxmci_host *host = mmc_priv(mmc);
893
894 if (host->pdata && host->pdata->get_ro)
895 return !!host->pdata->get_ro(mmc_dev(mmc));
896 /*
897 * Board doesn't support read only detection; let the mmc core
898 * decide what to do.
899 */
900 return -ENOSYS;
901 }
902
903
904 static const struct mmc_host_ops imxmci_ops = {
905 .request = imxmci_request,
906 .set_ios = imxmci_set_ios,
907 .get_ro = imxmci_get_ro,
908 };
909
imxmci_check_status(unsigned long data)910 static void imxmci_check_status(unsigned long data)
911 {
912 struct imxmci_host *host = (struct imxmci_host *)data;
913
914 if (host->pdata && host->pdata->card_present &&
915 host->pdata->card_present(mmc_dev(host->mmc)) != host->present) {
916 host->present ^= 1;
917 dev_info(mmc_dev(host->mmc), "card %s\n",
918 host->present ? "inserted" : "removed");
919
920 set_bit(IMXMCI_PEND_CARD_XCHG_b, &host->pending_events);
921 tasklet_schedule(&host->tasklet);
922 }
923
924 if (test_bit(IMXMCI_PEND_WAIT_RESP_b, &host->pending_events) ||
925 test_bit(IMXMCI_PEND_DMA_DATA_b, &host->pending_events)) {
926 atomic_inc(&host->stuck_timeout);
927 if (atomic_read(&host->stuck_timeout) > 4)
928 tasklet_schedule(&host->tasklet);
929 } else {
930 atomic_set(&host->stuck_timeout, 0);
931
932 }
933
934 mod_timer(&host->timer, jiffies + (HZ>>1));
935 }
936
imxmci_probe(struct platform_device * pdev)937 static int __init imxmci_probe(struct platform_device *pdev)
938 {
939 struct mmc_host *mmc;
940 struct imxmci_host *host = NULL;
941 struct resource *r;
942 int ret = 0, irq;
943 u16 rev_no;
944
945 pr_info("i.MX mmc driver\n");
946
947 r = platform_get_resource(pdev, IORESOURCE_MEM, 0);
948 irq = platform_get_irq(pdev, 0);
949 if (!r || irq < 0)
950 return -ENXIO;
951
952 r = request_mem_region(r->start, resource_size(r), pdev->name);
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;
967
968 /* MMC core transfer sizes tunable parameters */
969 mmc->max_segs = 64;
970 mmc->max_seg_size = 64*512; /* default PAGE_CACHE_SIZE */
971 mmc->max_req_size = 64*512; /* default PAGE_CACHE_SIZE */
972 mmc->max_blk_size = 2048;
973 mmc->max_blk_count = 65535;
974
975 host = mmc_priv(mmc);
976 host->base = ioremap(r->start, resource_size(r));
977 if (!host->base) {
978 ret = -ENOMEM;
979 goto out;
980 }
981
982 host->mmc = mmc;
983 host->dma_allocated = 0;
984 host->pdata = pdev->dev.platform_data;
985 if (!host->pdata)
986 dev_warn(&pdev->dev, "No platform data provided!\n");
987
988 spin_lock_init(&host->lock);
989 host->res = r;
990 host->irq = irq;
991
992 host->clk = clk_get(&pdev->dev, "perclk2");
993 if (IS_ERR(host->clk)) {
994 ret = PTR_ERR(host->clk);
995 goto out;
996 }
997 clk_enable(host->clk);
998
999 imx_gpio_mode(PB8_PF_SD_DAT0);
1000 imx_gpio_mode(PB9_PF_SD_DAT1);
1001 imx_gpio_mode(PB10_PF_SD_DAT2);
1002 /* Configured as GPIO with pull-up to ensure right MCC card mode */
1003 /* Switched to PB11_PF_SD_DAT3 if 4 bit bus is configured */
1004 imx_gpio_mode(GPIO_PORTB | GPIO_IN | GPIO_PUEN | 11);
1005 /* imx_gpio_mode(PB11_PF_SD_DAT3); */
1006 imx_gpio_mode(PB12_PF_SD_CLK);
1007 imx_gpio_mode(PB13_PF_SD_CMD);
1008
1009 imxmci_softreset(host);
1010
1011 rev_no = readw(host->base + MMC_REG_REV_NO);
1012 if (rev_no != 0x390) {
1013 dev_err(mmc_dev(host->mmc), "wrong rev.no. 0x%08x. aborting.\n",
1014 readw(host->base + MMC_REG_REV_NO));
1015 goto out;
1016 }
1017
1018 /* recommended in data sheet */
1019 writew(0x2db4, host->base + MMC_REG_READ_TO);
1020
1021 host->imask = IMXMCI_INT_MASK_DEFAULT;
1022 writew(host->imask, host->base + MMC_REG_INT_MASK);
1023
1024 host->dma = imx_dma_request_by_prio(DRIVER_NAME, DMA_PRIO_LOW);
1025 if(host->dma < 0) {
1026 dev_err(mmc_dev(host->mmc), "imx_dma_request_by_prio failed\n");
1027 ret = -EBUSY;
1028 goto out;
1029 }
1030 host->dma_allocated = 1;
1031 imx_dma_setup_handlers(host->dma, imxmci_dma_irq, NULL, host);
1032 RSSR(host->dma) = DMA_REQ_SDHC;
1033
1034 tasklet_init(&host->tasklet, imxmci_tasklet_fnc, (unsigned long)host);
1035 host->status_reg=0;
1036 host->pending_events=0;
1037
1038 ret = request_irq(host->irq, imxmci_irq, 0, DRIVER_NAME, host);
1039 if (ret)
1040 goto out;
1041
1042 if (host->pdata && host->pdata->card_present)
1043 host->present = host->pdata->card_present(mmc_dev(mmc));
1044 else /* if there is no way to detect assume that card is present */
1045 host->present = 1;
1046
1047 init_timer(&host->timer);
1048 host->timer.data = (unsigned long)host;
1049 host->timer.function = imxmci_check_status;
1050 add_timer(&host->timer);
1051 mod_timer(&host->timer, jiffies + (HZ >> 1));
1052
1053 platform_set_drvdata(pdev, mmc);
1054
1055 mmc_add_host(mmc);
1056
1057 return 0;
1058
1059 out:
1060 if (host) {
1061 if (host->dma_allocated) {
1062 imx_dma_free(host->dma);
1063 host->dma_allocated = 0;
1064 }
1065 if (host->clk) {
1066 clk_disable(host->clk);
1067 clk_put(host->clk);
1068 }
1069 if (host->base)
1070 iounmap(host->base);
1071 }
1072 if (mmc)
1073 mmc_free_host(mmc);
1074 release_mem_region(r->start, resource_size(r));
1075 return ret;
1076 }
1077
imxmci_remove(struct platform_device * pdev)1078 static int __exit imxmci_remove(struct platform_device *pdev)
1079 {
1080 struct mmc_host *mmc = platform_get_drvdata(pdev);
1081
1082 platform_set_drvdata(pdev, NULL);
1083
1084 if (mmc) {
1085 struct imxmci_host *host = mmc_priv(mmc);
1086
1087 tasklet_disable(&host->tasklet);
1088
1089 del_timer_sync(&host->timer);
1090 mmc_remove_host(mmc);
1091
1092 free_irq(host->irq, host);
1093 iounmap(host->base);
1094 if (host->dma_allocated) {
1095 imx_dma_free(host->dma);
1096 host->dma_allocated = 0;
1097 }
1098
1099 tasklet_kill(&host->tasklet);
1100
1101 clk_disable(host->clk);
1102 clk_put(host->clk);
1103
1104 release_mem_region(host->res->start, resource_size(host->res));
1105
1106 mmc_free_host(mmc);
1107 }
1108 return 0;
1109 }
1110
1111 #ifdef CONFIG_PM
imxmci_suspend(struct platform_device * dev,pm_message_t state)1112 static int imxmci_suspend(struct platform_device *dev, pm_message_t state)
1113 {
1114 struct mmc_host *mmc = platform_get_drvdata(dev);
1115 int ret = 0;
1116
1117 if (mmc)
1118 ret = mmc_suspend_host(mmc);
1119
1120 return ret;
1121 }
1122
imxmci_resume(struct platform_device * dev)1123 static int imxmci_resume(struct platform_device *dev)
1124 {
1125 struct mmc_host *mmc = platform_get_drvdata(dev);
1126 struct imxmci_host *host;
1127 int ret = 0;
1128
1129 if (mmc) {
1130 host = mmc_priv(mmc);
1131 if (host)
1132 set_bit(IMXMCI_PEND_SET_INIT_b, &host->pending_events);
1133 ret = mmc_resume_host(mmc);
1134 }
1135
1136 return ret;
1137 }
1138 #else
1139 #define imxmci_suspend NULL
1140 #define imxmci_resume NULL
1141 #endif /* CONFIG_PM */
1142
1143 static struct platform_driver imxmci_driver = {
1144 .remove = __exit_p(imxmci_remove),
1145 .suspend = imxmci_suspend,
1146 .resume = imxmci_resume,
1147 .driver = {
1148 .name = DRIVER_NAME,
1149 .owner = THIS_MODULE,
1150 }
1151 };
1152
imxmci_init(void)1153 static int __init imxmci_init(void)
1154 {
1155 return platform_driver_probe(&imxmci_driver, imxmci_probe);
1156 }
1157
imxmci_exit(void)1158 static void __exit imxmci_exit(void)
1159 {
1160 platform_driver_unregister(&imxmci_driver);
1161 }
1162
1163 module_init(imxmci_init);
1164 module_exit(imxmci_exit);
1165
1166 MODULE_DESCRIPTION("i.MX Multimedia Card Interface Driver");
1167 MODULE_AUTHOR("Sascha Hauer, Pengutronix");
1168 MODULE_LICENSE("GPL");
1169 MODULE_ALIAS("platform:imx-mmc");
1170