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authorPavel Pisa <ppisa@pikron.com>2006-04-02 14:27:07 -0400
committerRussell King <rmk+kernel@arm.linux.org.uk>2006-04-02 14:27:07 -0400
commit56ca904053ab14ba4067a72b69a5edf246771209 (patch)
tree23dc10e74bb4ce3d2a2ce5a9d8da1c5f5feda94d /drivers/mmc/imxmmc.c
parent65dbf34393f7b3d20e993d9651a825df0fa5376b (diff)
[ARM] 3457/1: i.MX: SD/MMC support for i.MX/MX1
Patch from Pavel Pisa This patch adds support of i.MX/MX1 SD/MMC controller. It has been significantly redesigned from the original Sascha Hauer's version to support scatter-gather DMA, to conform to latest Pierre Ossman's and Russell King's MMC-SD Linux 2.6.x infrastructure. The handling of all events has been moved to the softirq context and is designed with no busy-looping in mind. Unfortunately some controller bugs has to be overcome by limited looping about 2-20 usec but these are observed only for initial card recognition phase. There are still some missing/missed IRQs problems under heavy load. Help of somebody with access to the full SDHC design information is probably necessary. Regenerated against 2.6.16-git-060402 to solve clash with other patches. Signed-off-by: Pavel Pisa <pisa@cmp.felk.cvut.cz> Acked-by: Sascha Hauer <s.hauer@pengutronix.de> Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
Diffstat (limited to 'drivers/mmc/imxmmc.c')
-rw-r--r--drivers/mmc/imxmmc.c1096
1 files changed, 1096 insertions, 0 deletions
diff --git a/drivers/mmc/imxmmc.c b/drivers/mmc/imxmmc.c
new file mode 100644
index 000000000000..ffb7f55d3467
--- /dev/null
+++ b/drivers/mmc/imxmmc.c
@@ -0,0 +1,1096 @@
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
63struct 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
106#define IMXMCI_PEND_IRQ_m (1 << IMXMCI_PEND_IRQ_b)
107#define IMXMCI_PEND_DMA_END_m (1 << IMXMCI_PEND_DMA_END_b)
108#define IMXMCI_PEND_DMA_ERR_m (1 << IMXMCI_PEND_DMA_ERR_b)
109#define IMXMCI_PEND_WAIT_RESP_m (1 << IMXMCI_PEND_WAIT_RESP_b)
110#define IMXMCI_PEND_DMA_DATA_m (1 << IMXMCI_PEND_DMA_DATA_b)
111#define IMXMCI_PEND_CPU_DATA_m (1 << IMXMCI_PEND_CPU_DATA_b)
112#define IMXMCI_PEND_CARD_XCHG_m (1 << IMXMCI_PEND_CARD_XCHG_b)
113#define IMXMCI_PEND_SET_INIT_m (1 << IMXMCI_PEND_SET_INIT_b)
114
115static void imxmci_stop_clock(struct imxmci_host *host)
116{
117 int i = 0;
118 MMC_STR_STP_CLK &= ~STR_STP_CLK_START_CLK;
119 while(i < 0x1000) {
120 if(!(i & 0x7f))
121 MMC_STR_STP_CLK |= STR_STP_CLK_STOP_CLK;
122
123 if(!(MMC_STATUS & STATUS_CARD_BUS_CLK_RUN)) {
124 /* Check twice before cut */
125 if(!(MMC_STATUS & STATUS_CARD_BUS_CLK_RUN))
126 return;
127 }
128
129 i++;
130 }
131 dev_dbg(mmc_dev(host->mmc), "imxmci_stop_clock blocked, no luck\n");
132}
133
134static void imxmci_start_clock(struct imxmci_host *host)
135{
136 int i = 0;
137 MMC_STR_STP_CLK &= ~STR_STP_CLK_STOP_CLK;
138 while(i < 0x1000) {
139 if(!(i & 0x7f))
140 MMC_STR_STP_CLK |= STR_STP_CLK_START_CLK;
141
142 if(MMC_STATUS & STATUS_CARD_BUS_CLK_RUN) {
143 /* Check twice before cut */
144 if(MMC_STATUS & STATUS_CARD_BUS_CLK_RUN)
145 return;
146 }
147
148 i++;
149 }
150 dev_dbg(mmc_dev(host->mmc), "imxmci_start_clock blocked, no luck\n");
151}
152
153static void imxmci_softreset(void)
154{
155 /* reset sequence */
156 MMC_STR_STP_CLK = 0x8;
157 MMC_STR_STP_CLK = 0xD;
158 MMC_STR_STP_CLK = 0x5;
159 MMC_STR_STP_CLK = 0x5;
160 MMC_STR_STP_CLK = 0x5;
161 MMC_STR_STP_CLK = 0x5;
162 MMC_STR_STP_CLK = 0x5;
163 MMC_STR_STP_CLK = 0x5;
164 MMC_STR_STP_CLK = 0x5;
165 MMC_STR_STP_CLK = 0x5;
166
167 MMC_RES_TO = 0xff;
168 MMC_BLK_LEN = 512;
169 MMC_NOB = 1;
170}
171
172static int imxmci_busy_wait_for_status(struct imxmci_host *host,
173 unsigned int *pstat, unsigned int stat_mask,
174 int timeout, const char *where)
175{
176 int loops=0;
177 while(!(*pstat & stat_mask)) {
178 loops+=2;
179 if(loops >= timeout) {
180 dev_dbg(mmc_dev(host->mmc), "busy wait timeout in %s, STATUS = 0x%x (0x%x)\n",
181 where, *pstat, stat_mask);
182 return -1;
183 }
184 udelay(2);
185 *pstat |= MMC_STATUS;
186 }
187 if(!loops)
188 return 0;
189
190 dev_info(mmc_dev(host->mmc), "busy wait for %d usec in %s, STATUS = 0x%x (0x%x)\n",
191 loops, where, *pstat, stat_mask);
192 return loops;
193}
194
195static void imxmci_setup_data(struct imxmci_host *host, struct mmc_data *data)
196{
197 unsigned int nob = data->blocks;
198 unsigned int blksz = 1 << data->blksz_bits;
199 unsigned int datasz = nob * blksz;
200 int i;
201
202 if (data->flags & MMC_DATA_STREAM)
203 nob = 0xffff;
204
205 host->data = data;
206 data->bytes_xfered = 0;
207
208 MMC_NOB = nob;
209 MMC_BLK_LEN = blksz;
210
211 /*
212 * DMA cannot be used for small block sizes, we have to use CPU driven transfers otherwise.
213 * We are in big troubles for non-512 byte transfers according to note in the paragraph
214 * 20.6.7 of User Manual anyway, but we need to be able to transfer SCR at least.
215 * The situation is even more complex in reality. The SDHC in not able to handle wll
216 * partial FIFO fills and reads. The length has to be rounded up to burst size multiple.
217 * This is required for SCR read at least.
218 */
219 if (datasz < 64) {
220 host->dma_size = datasz;
221 if (data->flags & MMC_DATA_READ) {
222 host->dma_dir = DMA_FROM_DEVICE;
223
224 /* Hack to enable read SCR */
225 if(datasz < 16) {
226 MMC_NOB = 1;
227 MMC_BLK_LEN = 16;
228 }
229 } else {
230 host->dma_dir = DMA_TO_DEVICE;
231 }
232
233 /* Convert back to virtual address */
234 host->data_ptr = (u16*)(page_address(data->sg->page) + data->sg->offset);
235 host->data_cnt = 0;
236
237 clear_bit(IMXMCI_PEND_DMA_DATA_b, &host->pending_events);
238 set_bit(IMXMCI_PEND_CPU_DATA_b, &host->pending_events);
239
240 return;
241 }
242
243 if (data->flags & MMC_DATA_READ) {
244 host->dma_dir = DMA_FROM_DEVICE;
245 host->dma_nents = dma_map_sg(mmc_dev(host->mmc), data->sg,
246 data->sg_len, host->dma_dir);
247
248 imx_dma_setup_sg(host->dma, data->sg, data->sg_len, datasz,
249 host->res->start + MMC_BUFFER_ACCESS_OFS, DMA_MODE_READ);
250
251 /*imx_dma_setup_mem2dev_ccr(host->dma, DMA_MODE_READ, IMX_DMA_WIDTH_16, CCR_REN);*/
252 CCR(host->dma) = CCR_DMOD_LINEAR | CCR_DSIZ_32 | CCR_SMOD_FIFO | CCR_SSIZ_16 | CCR_REN;
253 } else {
254 host->dma_dir = DMA_TO_DEVICE;
255
256 host->dma_nents = dma_map_sg(mmc_dev(host->mmc), data->sg,
257 data->sg_len, host->dma_dir);
258
259 imx_dma_setup_sg(host->dma, data->sg, data->sg_len, datasz,
260 host->res->start + MMC_BUFFER_ACCESS_OFS, DMA_MODE_WRITE);
261
262 /*imx_dma_setup_mem2dev_ccr(host->dma, DMA_MODE_WRITE, IMX_DMA_WIDTH_16, CCR_REN);*/
263 CCR(host->dma) = CCR_SMOD_LINEAR | CCR_SSIZ_32 | CCR_DMOD_FIFO | CCR_DSIZ_16 | CCR_REN;
264 }
265
266#if 1 /* This code is there only for consistency checking and can be disabled in future */
267 host->dma_size = 0;
268 for(i=0; i<host->dma_nents; i++)
269 host->dma_size+=data->sg[i].length;
270
271 if (datasz > host->dma_size) {
272 dev_err(mmc_dev(host->mmc), "imxmci_setup_data datasz 0x%x > 0x%x dm_size\n",
273 datasz, host->dma_size);
274 }
275#endif
276
277 host->dma_size = datasz;
278
279 wmb();
280
281 if(host->actual_bus_width == MMC_BUS_WIDTH_4)
282 BLR(host->dma) = 0; /* burst 64 byte read / 64 bytes write */
283 else
284 BLR(host->dma) = 16; /* burst 16 byte read / 16 bytes write */
285
286 RSSR(host->dma) = DMA_REQ_SDHC;
287
288 set_bit(IMXMCI_PEND_DMA_DATA_b, &host->pending_events);
289 clear_bit(IMXMCI_PEND_CPU_DATA_b, &host->pending_events);
290
291 /* start DMA engine for read, write is delayed after initial response */
292 if (host->dma_dir == DMA_FROM_DEVICE) {
293 imx_dma_enable(host->dma);
294 }
295}
296
297static void imxmci_start_cmd(struct imxmci_host *host, struct mmc_command *cmd, unsigned int cmdat)
298{
299 unsigned long flags;
300 u32 imask;
301
302 WARN_ON(host->cmd != NULL);
303 host->cmd = cmd;
304
305 if (cmd->flags & MMC_RSP_BUSY)
306 cmdat |= CMD_DAT_CONT_BUSY;
307
308 switch (mmc_resp_type(cmd)) {
309 case MMC_RSP_R1: /* short CRC, OPCODE */
310 case MMC_RSP_R1B:/* short CRC, OPCODE, BUSY */
311 cmdat |= CMD_DAT_CONT_RESPONSE_FORMAT_R1;
312 break;
313 case MMC_RSP_R2: /* long 136 bit + CRC */
314 cmdat |= CMD_DAT_CONT_RESPONSE_FORMAT_R2;
315 break;
316 case MMC_RSP_R3: /* short */
317 cmdat |= CMD_DAT_CONT_RESPONSE_FORMAT_R3;
318 break;
319 case MMC_RSP_R6: /* short CRC */
320 cmdat |= CMD_DAT_CONT_RESPONSE_FORMAT_R6;
321 break;
322 default:
323 break;
324 }
325
326 if ( test_and_clear_bit(IMXMCI_PEND_SET_INIT_b, &host->pending_events) )
327 cmdat |= CMD_DAT_CONT_INIT; /* This command needs init */
328
329 if ( host->actual_bus_width == MMC_BUS_WIDTH_4 )
330 cmdat |= CMD_DAT_CONT_BUS_WIDTH_4;
331
332 MMC_CMD = cmd->opcode;
333 MMC_ARGH = cmd->arg >> 16;
334 MMC_ARGL = cmd->arg & 0xffff;
335 MMC_CMD_DAT_CONT = cmdat;
336
337 atomic_set(&host->stuck_timeout, 0);
338 set_bit(IMXMCI_PEND_WAIT_RESP_b, &host->pending_events);
339
340
341 imask = IMXMCI_INT_MASK_DEFAULT;
342 imask &= ~INT_MASK_END_CMD_RES;
343 if ( cmdat & CMD_DAT_CONT_DATA_ENABLE ) {
344 /*imask &= ~INT_MASK_BUF_READY;*/
345 imask &= ~INT_MASK_DATA_TRAN;
346 if ( cmdat & CMD_DAT_CONT_WRITE )
347 imask &= ~INT_MASK_WRITE_OP_DONE;
348 if(test_bit(IMXMCI_PEND_CPU_DATA_b, &host->pending_events))
349 imask &= ~INT_MASK_BUF_READY;
350 }
351
352 spin_lock_irqsave(&host->lock, flags);
353 host->imask = imask;
354 MMC_INT_MASK = host->imask;
355 spin_unlock_irqrestore(&host->lock, flags);
356
357 dev_dbg(mmc_dev(host->mmc), "CMD%02d (0x%02x) mask set to 0x%04x\n",
358 cmd->opcode, cmd->opcode, imask);
359
360 imxmci_start_clock(host);
361}
362
363static void imxmci_finish_request(struct imxmci_host *host, struct mmc_request *req)
364{
365 unsigned long flags;
366
367 spin_lock_irqsave(&host->lock, flags);
368
369 host->pending_events &= ~(IMXMCI_PEND_WAIT_RESP_m | IMXMCI_PEND_DMA_END_m |
370 IMXMCI_PEND_DMA_DATA_m | IMXMCI_PEND_CPU_DATA_m);
371
372 host->imask = IMXMCI_INT_MASK_DEFAULT;
373 MMC_INT_MASK = host->imask;
374
375 spin_unlock_irqrestore(&host->lock, flags);
376
377 host->req = NULL;
378 host->cmd = NULL;
379 host->data = NULL;
380 mmc_request_done(host->mmc, req);
381}
382
383static int imxmci_finish_data(struct imxmci_host *host, unsigned int stat)
384{
385 struct mmc_data *data = host->data;
386 int data_error;
387
388 if(test_and_clear_bit(IMXMCI_PEND_DMA_DATA_b, &host->pending_events)){
389 imx_dma_disable(host->dma);
390 dma_unmap_sg(mmc_dev(host->mmc), data->sg, host->dma_nents,
391 host->dma_dir);
392 }
393
394 if ( stat & STATUS_ERR_MASK ) {
395 dev_dbg(mmc_dev(host->mmc), "request failed. status: 0x%08x\n",stat);
396 if(stat & (STATUS_CRC_READ_ERR | STATUS_CRC_WRITE_ERR))
397 data->error = MMC_ERR_BADCRC;
398 else if(stat & STATUS_TIME_OUT_READ)
399 data->error = MMC_ERR_TIMEOUT;
400 else
401 data->error = MMC_ERR_FAILED;
402 } else {
403 data->bytes_xfered = host->dma_size;
404 }
405
406 data_error = data->error;
407
408 host->data = NULL;
409
410 return data_error;
411}
412
413static int imxmci_cmd_done(struct imxmci_host *host, unsigned int stat)
414{
415 struct mmc_command *cmd = host->cmd;
416 int i;
417 u32 a,b,c;
418 struct mmc_data *data = host->data;
419
420 if (!cmd)
421 return 0;
422
423 host->cmd = NULL;
424
425 if (stat & STATUS_TIME_OUT_RESP) {
426 dev_dbg(mmc_dev(host->mmc), "CMD TIMEOUT\n");
427 cmd->error = MMC_ERR_TIMEOUT;
428 } else if (stat & STATUS_RESP_CRC_ERR && cmd->flags & MMC_RSP_CRC) {
429 dev_dbg(mmc_dev(host->mmc), "cmd crc error\n");
430 cmd->error = MMC_ERR_BADCRC;
431 }
432
433 if(cmd->flags & MMC_RSP_PRESENT) {
434 if(cmd->flags & MMC_RSP_136) {
435 for (i = 0; i < 4; i++) {
436 u32 a = MMC_RES_FIFO & 0xffff;
437 u32 b = MMC_RES_FIFO & 0xffff;
438 cmd->resp[i] = a<<16 | b;
439 }
440 } else {
441 a = MMC_RES_FIFO & 0xffff;
442 b = MMC_RES_FIFO & 0xffff;
443 c = MMC_RES_FIFO & 0xffff;
444 cmd->resp[0] = a<<24 | b<<8 | c>>8;
445 }
446 }
447
448 dev_dbg(mmc_dev(host->mmc), "RESP 0x%08x, 0x%08x, 0x%08x, 0x%08x, error %d\n",
449 cmd->resp[0], cmd->resp[1], cmd->resp[2], cmd->resp[3], cmd->error);
450
451 if (data && (cmd->error == MMC_ERR_NONE) && !(stat & STATUS_ERR_MASK)) {
452 if (host->req->data->flags & MMC_DATA_WRITE) {
453
454 /* Wait for FIFO to be empty before starting DMA write */
455
456 stat = MMC_STATUS;
457 if(imxmci_busy_wait_for_status(host, &stat,
458 STATUS_APPL_BUFF_FE,
459 40, "imxmci_cmd_done DMA WR") < 0) {
460 cmd->error = MMC_ERR_FIFO;
461 imxmci_finish_data(host, stat);
462 if(host->req)
463 imxmci_finish_request(host, host->req);
464 dev_warn(mmc_dev(host->mmc), "STATUS = 0x%04x\n",
465 stat);
466 return 0;
467 }
468
469 if(test_bit(IMXMCI_PEND_DMA_DATA_b, &host->pending_events)) {
470 imx_dma_enable(host->dma);
471 }
472 }
473 } else {
474 struct mmc_request *req;
475 imxmci_stop_clock(host);
476 req = host->req;
477
478 if(data)
479 imxmci_finish_data(host, stat);
480
481 if( req ) {
482 imxmci_finish_request(host, req);
483 } else {
484 dev_warn(mmc_dev(host->mmc), "imxmci_cmd_done: no request to finish\n");
485 }
486 }
487
488 return 1;
489}
490
491static int imxmci_data_done(struct imxmci_host *host, unsigned int stat)
492{
493 struct mmc_data *data = host->data;
494 int data_error;
495
496 if (!data)
497 return 0;
498
499 data_error = imxmci_finish_data(host, stat);
500
501 if (host->req->stop && (data_error == MMC_ERR_NONE)) {
502 imxmci_stop_clock(host);
503 imxmci_start_cmd(host, host->req->stop, 0);
504 } else {
505 struct mmc_request *req;
506 req = host->req;
507 if( req ) {
508 imxmci_finish_request(host, req);
509 } else {
510 dev_warn(mmc_dev(host->mmc), "imxmci_data_done: no request to finish\n");
511 }
512 }
513
514 return 1;
515}
516
517static int imxmci_cpu_driven_data(struct imxmci_host *host, unsigned int *pstat)
518{
519 int i;
520 int burst_len;
521 int flush_len;
522 int trans_done = 0;
523 unsigned int stat = *pstat;
524
525 if(host->actual_bus_width == MMC_BUS_WIDTH_4)
526 burst_len = 16;
527 else
528 burst_len = 64;
529
530 /* This is unfortunately required */
531 dev_dbg(mmc_dev(host->mmc), "imxmci_cpu_driven_data running STATUS = 0x%x\n",
532 stat);
533
534 if(host->dma_dir == DMA_FROM_DEVICE) {
535 imxmci_busy_wait_for_status(host, &stat,
536 STATUS_APPL_BUFF_FF | STATUS_DATA_TRANS_DONE,
537 20, "imxmci_cpu_driven_data read");
538
539 while((stat & (STATUS_APPL_BUFF_FF | STATUS_DATA_TRANS_DONE)) &&
540 (host->data_cnt < host->dma_size)) {
541 if(burst_len >= host->dma_size - host->data_cnt) {
542 flush_len = burst_len;
543 burst_len = host->dma_size - host->data_cnt;
544 flush_len -= burst_len;
545 host->data_cnt = host->dma_size;
546 trans_done = 1;
547 } else {
548 flush_len = 0;
549 host->data_cnt += burst_len;
550 }
551
552 for(i = burst_len; i>=2 ; i-=2) {
553 *(host->data_ptr++) = MMC_BUFFER_ACCESS;
554 udelay(20); /* required for clocks < 8MHz*/
555 }
556
557 if(i == 1)
558 *(u8*)(host->data_ptr) = MMC_BUFFER_ACCESS;
559
560 stat = MMC_STATUS;
561
562 /* Flush extra bytes from FIFO */
563 while(flush_len >= 2){
564 flush_len -= 2;
565 i = MMC_BUFFER_ACCESS;
566 stat = MMC_STATUS;
567 stat &= ~STATUS_CRC_READ_ERR; /* Stupid but required there */
568 }
569
570 dev_dbg(mmc_dev(host->mmc), "imxmci_cpu_driven_data read burst %d STATUS = 0x%x\n",
571 burst_len, stat);
572 }
573 } else {
574 imxmci_busy_wait_for_status(host, &stat,
575 STATUS_APPL_BUFF_FE,
576 20, "imxmci_cpu_driven_data write");
577
578 while((stat & STATUS_APPL_BUFF_FE) &&
579 (host->data_cnt < host->dma_size)) {
580 if(burst_len >= host->dma_size - host->data_cnt) {
581 burst_len = host->dma_size - host->data_cnt;
582 host->data_cnt = host->dma_size;
583 trans_done = 1;
584 } else {
585 host->data_cnt += burst_len;
586 }
587
588 for(i = burst_len; i>0 ; i-=2)
589 MMC_BUFFER_ACCESS = *(host->data_ptr++);
590
591 stat = MMC_STATUS;
592
593 dev_dbg(mmc_dev(host->mmc), "imxmci_cpu_driven_data write burst %d STATUS = 0x%x\n",
594 burst_len, stat);
595 }
596 }
597
598 *pstat = stat;
599
600 return trans_done;
601}
602
603static void imxmci_dma_irq(int dma, void *devid, struct pt_regs *regs)
604{
605 struct imxmci_host *host = devid;
606 uint32_t stat = MMC_STATUS;
607
608 atomic_set(&host->stuck_timeout, 0);
609 host->status_reg = stat;
610 set_bit(IMXMCI_PEND_DMA_END_b, &host->pending_events);
611 tasklet_schedule(&host->tasklet);
612}
613
614static irqreturn_t imxmci_irq(int irq, void *devid, struct pt_regs *regs)
615{
616 struct imxmci_host *host = devid;
617 uint32_t stat = MMC_STATUS;
618 int handled = 1;
619
620 MMC_INT_MASK = host->imask | INT_MASK_SDIO | INT_MASK_AUTO_CARD_DETECT;
621
622 atomic_set(&host->stuck_timeout, 0);
623 host->status_reg = stat;
624 set_bit(IMXMCI_PEND_IRQ_b, &host->pending_events);
625 tasklet_schedule(&host->tasklet);
626
627 return IRQ_RETVAL(handled);;
628}
629
630static void imxmci_tasklet_fnc(unsigned long data)
631{
632 struct imxmci_host *host = (struct imxmci_host *)data;
633 u32 stat;
634 unsigned int data_dir_mask = 0; /* STATUS_WR_CRC_ERROR_CODE_MASK */
635 int timeout = 0;
636
637 if(atomic_read(&host->stuck_timeout) > 4) {
638 char *what;
639 timeout = 1;
640 stat = MMC_STATUS;
641 host->status_reg = stat;
642 if (test_bit(IMXMCI_PEND_WAIT_RESP_b, &host->pending_events))
643 if (test_bit(IMXMCI_PEND_DMA_DATA_b, &host->pending_events))
644 what = "RESP+DMA";
645 else
646 what = "RESP";
647 else
648 if (test_bit(IMXMCI_PEND_DMA_DATA_b, &host->pending_events))
649 if(test_bit(IMXMCI_PEND_DMA_END_b, &host->pending_events))
650 what = "DATA";
651 else
652 what = "DMA";
653 else
654 what = "???";
655
656 dev_err(mmc_dev(host->mmc), "%s TIMEOUT, hardware stucked STATUS = 0x%04x IMASK = 0x%04x\n",
657 what, stat, MMC_INT_MASK);
658 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",
659 MMC_CMD_DAT_CONT, MMC_BLK_LEN, MMC_NOB, CCR(host->dma));
660 dev_err(mmc_dev(host->mmc), "CMD%d, bus %d-bit, dma_size = 0x%x\n",
661 host->cmd?host->cmd->opcode:0, 1<<host->actual_bus_width, host->dma_size);
662 }
663
664 if(!host->present || timeout)
665 host->status_reg = STATUS_TIME_OUT_RESP | STATUS_TIME_OUT_READ |
666 STATUS_CRC_READ_ERR | STATUS_CRC_WRITE_ERR;
667
668 if(test_bit(IMXMCI_PEND_IRQ_b, &host->pending_events) || timeout) {
669 clear_bit(IMXMCI_PEND_IRQ_b, &host->pending_events);
670
671 stat = MMC_STATUS;
672 /*
673 * This is not required in theory, but there is chance to miss some flag
674 * which clears automatically by mask write, FreeScale original code keeps
675 * stat from IRQ time so do I
676 */
677 stat |= host->status_reg;
678
679 if(test_bit(IMXMCI_PEND_WAIT_RESP_b, &host->pending_events)) {
680 imxmci_busy_wait_for_status(host, &stat,
681 STATUS_END_CMD_RESP | STATUS_ERR_MASK,
682 20, "imxmci_tasklet_fnc resp (ERRATUM #4)");
683 }
684
685 if(stat & (STATUS_END_CMD_RESP | STATUS_ERR_MASK)) {
686 if(test_and_clear_bit(IMXMCI_PEND_WAIT_RESP_b, &host->pending_events))
687 imxmci_cmd_done(host, stat);
688 if(host->data && (stat & STATUS_ERR_MASK))
689 imxmci_data_done(host, stat);
690 }
691
692 if(test_bit(IMXMCI_PEND_CPU_DATA_b, &host->pending_events)) {
693 stat |= MMC_STATUS;
694 if(imxmci_cpu_driven_data(host, &stat)){
695 if(test_and_clear_bit(IMXMCI_PEND_WAIT_RESP_b, &host->pending_events))
696 imxmci_cmd_done(host, stat);
697 atomic_clear_mask(IMXMCI_PEND_IRQ_m|IMXMCI_PEND_CPU_DATA_m,
698 &host->pending_events);
699 imxmci_data_done(host, stat);
700 }
701 }
702 }
703
704 if(test_bit(IMXMCI_PEND_DMA_END_b, &host->pending_events) &&
705 !test_bit(IMXMCI_PEND_WAIT_RESP_b, &host->pending_events)) {
706
707 stat = MMC_STATUS;
708 /* Same as above */
709 stat |= host->status_reg;
710
711 if(host->dma_dir == DMA_TO_DEVICE) {
712 data_dir_mask = STATUS_WRITE_OP_DONE;
713 } else {
714 data_dir_mask = STATUS_DATA_TRANS_DONE;
715 }
716
717 imxmci_busy_wait_for_status(host, &stat,
718 data_dir_mask,
719 50, "imxmci_tasklet_fnc data");
720
721 if(stat & data_dir_mask) {
722 clear_bit(IMXMCI_PEND_DMA_END_b, &host->pending_events);
723 imxmci_data_done(host, stat);
724 }
725 }
726
727 if(test_and_clear_bit(IMXMCI_PEND_CARD_XCHG_b, &host->pending_events)) {
728
729 if(host->cmd)
730 imxmci_cmd_done(host, STATUS_TIME_OUT_RESP);
731
732 if(host->data)
733 imxmci_data_done(host, STATUS_TIME_OUT_READ |
734 STATUS_CRC_READ_ERR | STATUS_CRC_WRITE_ERR);
735
736 if(host->req)
737 imxmci_finish_request(host, host->req);
738
739 mmc_detect_change(host->mmc, msecs_to_jiffies(100));
740
741 }
742}
743
744static void imxmci_request(struct mmc_host *mmc, struct mmc_request *req)
745{
746 struct imxmci_host *host = mmc_priv(mmc);
747 unsigned int cmdat;
748
749 WARN_ON(host->req != NULL);
750
751 host->req = req;
752
753 cmdat = 0;
754
755 if (req->data) {
756 imxmci_setup_data(host, req->data);
757
758 cmdat |= CMD_DAT_CONT_DATA_ENABLE;
759
760 if (req->data->flags & MMC_DATA_WRITE)
761 cmdat |= CMD_DAT_CONT_WRITE;
762
763 if (req->data->flags & MMC_DATA_STREAM) {
764 cmdat |= CMD_DAT_CONT_STREAM_BLOCK;
765 }
766 }
767
768 imxmci_start_cmd(host, req->cmd, cmdat);
769}
770
771#define CLK_RATE 19200000
772
773static void imxmci_set_ios(struct mmc_host *mmc, struct mmc_ios *ios)
774{
775 struct imxmci_host *host = mmc_priv(mmc);
776 int prescaler;
777
778 dev_dbg(mmc_dev(host->mmc), "clock %u power %u vdd %u width %u\n",
779 ios->clock, ios->power_mode, ios->vdd,
780 (ios->bus_width==MMC_BUS_WIDTH_4)?4:1);
781
782 if( ios->bus_width==MMC_BUS_WIDTH_4 ) {
783 host->actual_bus_width = MMC_BUS_WIDTH_4;
784 imx_gpio_mode(PB11_PF_SD_DAT3);
785 }else{
786 host->actual_bus_width = MMC_BUS_WIDTH_1;
787 imx_gpio_mode(GPIO_PORTB | GPIO_IN | GPIO_PUEN | 11);
788 }
789
790 if ( host->power_mode != ios->power_mode ) {
791 switch (ios->power_mode) {
792 case MMC_POWER_OFF:
793 break;
794 case MMC_POWER_UP:
795 set_bit(IMXMCI_PEND_SET_INIT_b, &host->pending_events);
796 break;
797 case MMC_POWER_ON:
798 break;
799 }
800 host->power_mode = ios->power_mode;
801 }
802
803 if ( ios->clock ) {
804 unsigned int clk;
805
806 /* The prescaler is 5 for PERCLK2 equal to 96MHz
807 * then 96MHz / 5 = 19.2 MHz
808 */
809 clk=imx_get_perclk2();
810 prescaler=(clk+(CLK_RATE*7)/8)/CLK_RATE;
811 switch(prescaler) {
812 case 0:
813 case 1: prescaler = 0;
814 break;
815 case 2: prescaler = 1;
816 break;
817 case 3: prescaler = 2;
818 break;
819 case 4: prescaler = 4;
820 break;
821 default:
822 case 5: prescaler = 5;
823 break;
824 }
825
826 dev_dbg(mmc_dev(host->mmc), "PERCLK2 %d MHz -> prescaler %d\n",
827 clk, prescaler);
828
829 for(clk=0; clk<8; clk++) {
830 int x;
831 x = CLK_RATE / (1<<clk);
832 if( x <= ios->clock)
833 break;
834 }
835
836 MMC_STR_STP_CLK |= STR_STP_CLK_ENABLE; /* enable controller */
837
838 imxmci_stop_clock(host);
839 MMC_CLK_RATE = (prescaler<<3) | clk;
840 imxmci_start_clock(host);
841
842 dev_dbg(mmc_dev(host->mmc), "MMC_CLK_RATE: 0x%08x\n", MMC_CLK_RATE);
843 } else {
844 imxmci_stop_clock(host);
845 }
846}
847
848static struct mmc_host_ops imxmci_ops = {
849 .request = imxmci_request,
850 .set_ios = imxmci_set_ios,
851};
852
853static struct resource *platform_device_resource(struct platform_device *dev, unsigned int mask, int nr)
854{
855 int i;
856
857 for (i = 0; i < dev->num_resources; i++)
858 if (dev->resource[i].flags == mask && nr-- == 0)
859 return &dev->resource[i];
860 return NULL;
861}
862
863static int platform_device_irq(struct platform_device *dev, int nr)
864{
865 int i;
866
867 for (i = 0; i < dev->num_resources; i++)
868 if (dev->resource[i].flags == IORESOURCE_IRQ && nr-- == 0)
869 return dev->resource[i].start;
870 return NO_IRQ;
871}
872
873static void imxmci_check_status(unsigned long data)
874{
875 struct imxmci_host *host = (struct imxmci_host *)data;
876
877 if( host->pdata->card_present() != host->present ) {
878 host->present ^= 1;
879 dev_info(mmc_dev(host->mmc), "card %s\n",
880 host->present ? "inserted" : "removed");
881
882 set_bit(IMXMCI_PEND_CARD_XCHG_b, &host->pending_events);
883 tasklet_schedule(&host->tasklet);
884 }
885
886 if(test_bit(IMXMCI_PEND_WAIT_RESP_b, &host->pending_events) ||
887 test_bit(IMXMCI_PEND_DMA_DATA_b, &host->pending_events)) {
888 atomic_inc(&host->stuck_timeout);
889 if(atomic_read(&host->stuck_timeout) > 4)
890 tasklet_schedule(&host->tasklet);
891 } else {
892 atomic_set(&host->stuck_timeout, 0);
893
894 }
895
896 mod_timer(&host->timer, jiffies + (HZ>>1));
897}
898
899static int imxmci_probe(struct platform_device *pdev)
900{
901 struct mmc_host *mmc;
902 struct imxmci_host *host = NULL;
903 struct resource *r;
904 int ret = 0, irq;
905
906 printk(KERN_INFO "i.MX mmc driver\n");
907
908 r = platform_device_resource(pdev, IORESOURCE_MEM, 0);
909 irq = platform_device_irq(pdev, 0);
910 if (!r || irq == NO_IRQ)
911 return -ENXIO;
912
913 r = request_mem_region(r->start, 0x100, "IMXMCI");
914 if (!r)
915 return -EBUSY;
916
917 mmc = mmc_alloc_host(sizeof(struct imxmci_host), &pdev->dev);
918 if (!mmc) {
919 ret = -ENOMEM;
920 goto out;
921 }
922
923 mmc->ops = &imxmci_ops;
924 mmc->f_min = 150000;
925 mmc->f_max = CLK_RATE/2;
926 mmc->ocr_avail = MMC_VDD_32_33;
927 mmc->caps |= MMC_CAP_4_BIT_DATA;
928
929 /* MMC core transfer sizes tunable parameters */
930 mmc->max_hw_segs = 64;
931 mmc->max_phys_segs = 64;
932 mmc->max_sectors = 64; /* default 1 << (PAGE_CACHE_SHIFT - 9) */
933 mmc->max_seg_size = 64*512; /* default PAGE_CACHE_SIZE */
934
935 host = mmc_priv(mmc);
936 host->mmc = mmc;
937 host->dma_allocated = 0;
938 host->pdata = pdev->dev.platform_data;
939
940 spin_lock_init(&host->lock);
941 host->res = r;
942 host->irq = irq;
943
944 imx_gpio_mode(PB8_PF_SD_DAT0);
945 imx_gpio_mode(PB9_PF_SD_DAT1);
946 imx_gpio_mode(PB10_PF_SD_DAT2);
947 /* Configured as GPIO with pull-up to ensure right MCC card mode */
948 /* Switched to PB11_PF_SD_DAT3 if 4 bit bus is configured */
949 imx_gpio_mode(GPIO_PORTB | GPIO_IN | GPIO_PUEN | 11);
950 /* imx_gpio_mode(PB11_PF_SD_DAT3); */
951 imx_gpio_mode(PB12_PF_SD_CLK);
952 imx_gpio_mode(PB13_PF_SD_CMD);
953
954 imxmci_softreset();
955
956 if ( MMC_REV_NO != 0x390 ) {
957 dev_err(mmc_dev(host->mmc), "wrong rev.no. 0x%08x. aborting.\n",
958 MMC_REV_NO);
959 goto out;
960 }
961
962 MMC_READ_TO = 0x2db4; /* recommended in data sheet */
963
964 host->imask = IMXMCI_INT_MASK_DEFAULT;
965 MMC_INT_MASK = host->imask;
966
967
968 if(imx_dma_request_by_prio(&host->dma, DRIVER_NAME, DMA_PRIO_LOW)<0){
969 dev_err(mmc_dev(host->mmc), "imx_dma_request_by_prio failed\n");
970 ret = -EBUSY;
971 goto out;
972 }
973 host->dma_allocated=1;
974 imx_dma_setup_handlers(host->dma, imxmci_dma_irq, NULL, host);
975
976 tasklet_init(&host->tasklet, imxmci_tasklet_fnc, (unsigned long)host);
977 host->status_reg=0;
978 host->pending_events=0;
979
980 ret = request_irq(host->irq, imxmci_irq, 0, DRIVER_NAME, host);
981 if (ret)
982 goto out;
983
984 host->present = host->pdata->card_present();
985 init_timer(&host->timer);
986 host->timer.data = (unsigned long)host;
987 host->timer.function = imxmci_check_status;
988 add_timer(&host->timer);
989 mod_timer(&host->timer, jiffies + (HZ>>1));
990
991 platform_set_drvdata(pdev, mmc);
992
993 mmc_add_host(mmc);
994
995 return 0;
996
997out:
998 if (host) {
999 if(host->dma_allocated){
1000 imx_dma_free(host->dma);
1001 host->dma_allocated=0;
1002 }
1003 }
1004 if (mmc)
1005 mmc_free_host(mmc);
1006 release_resource(r);
1007 return ret;
1008}
1009
1010static int imxmci_remove(struct platform_device *pdev)
1011{
1012 struct mmc_host *mmc = platform_get_drvdata(pdev);
1013
1014 platform_set_drvdata(pdev, NULL);
1015
1016 if (mmc) {
1017 struct imxmci_host *host = mmc_priv(mmc);
1018
1019 tasklet_disable(&host->tasklet);
1020
1021 del_timer_sync(&host->timer);
1022 mmc_remove_host(mmc);
1023
1024 free_irq(host->irq, host);
1025 if(host->dma_allocated){
1026 imx_dma_free(host->dma);
1027 host->dma_allocated=0;
1028 }
1029
1030 tasklet_kill(&host->tasklet);
1031
1032 release_resource(host->res);
1033
1034 mmc_free_host(mmc);
1035 }
1036 return 0;
1037}
1038
1039#ifdef CONFIG_PM
1040static int imxmci_suspend(struct platform_device *dev, pm_message_t state)
1041{
1042 struct mmc_host *mmc = platform_get_drvdata(dev);
1043 int ret = 0;
1044
1045 if (mmc)
1046 ret = mmc_suspend_host(mmc, state);
1047
1048 return ret;
1049}
1050
1051static int imxmci_resume(struct platform_device *dev)
1052{
1053 struct mmc_host *mmc = platform_get_drvdata(dev);
1054 struct imxmci_host *host;
1055 int ret = 0;
1056
1057 if (mmc) {
1058 host = mmc_priv(mmc);
1059 if(host)
1060 set_bit(IMXMCI_PEND_SET_INIT_b, &host->pending_events);
1061 ret = mmc_resume_host(mmc);
1062 }
1063
1064 return ret;
1065}
1066#else
1067#define imxmci_suspend NULL
1068#define imxmci_resume NULL
1069#endif /* CONFIG_PM */
1070
1071static struct platform_driver imxmci_driver = {
1072 .probe = imxmci_probe,
1073 .remove = imxmci_remove,
1074 .suspend = imxmci_suspend,
1075 .resume = imxmci_resume,
1076 .driver = {
1077 .name = DRIVER_NAME,
1078 }
1079};
1080
1081static int __init imxmci_init(void)
1082{
1083 return platform_driver_register(&imxmci_driver);
1084}
1085
1086static void __exit imxmci_exit(void)
1087{
1088 platform_driver_unregister(&imxmci_driver);
1089}
1090
1091module_init(imxmci_init);
1092module_exit(imxmci_exit);
1093
1094MODULE_DESCRIPTION("i.MX Multimedia Card Interface Driver");
1095MODULE_AUTHOR("Sascha Hauer, Pengutronix");
1096MODULE_LICENSE("GPL");
generated by cgit v1.2.2 (git 2.25.0) at 2024-11-07 20:52:28 -0500