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Merge remote-tracking branch 'cleancache/linux-next'
[linux-2.6/next.git] / drivers / mmc / host / at91_mci.c
blobd3e6a962f42343ac4f30fdd7dc7da8f13ff8a95a
1 /*
2 * linux/drivers/mmc/host/at91_mci.c - ATMEL AT91 MCI Driver
3 *
4 * Copyright (C) 2005 Cougar Creek Computing Devices Ltd, All Rights Reserved
5 *
6 * Copyright (C) 2006 Malcolm Noyes
7 *
8 * This program is free software; you can redistribute it and/or modify
9 * it under the terms of the GNU General Public License version 2 as
10 * published by the Free Software Foundation.
11 */
12
13 /*
14 This is the AT91 MCI driver that has been tested with both MMC cards
15 and SD-cards. Boards that support write protect are now supported.
16 The CCAT91SBC001 board does not support SD cards.
17
18 The three entry points are at91_mci_request, at91_mci_set_ios
19 and at91_mci_get_ro.
20
21 SET IOS
22 This configures the device to put it into the correct mode and clock speed
23 required.
24
25 MCI REQUEST
26 MCI request processes the commands sent in the mmc_request structure. This
27 can consist of a processing command and a stop command in the case of
28 multiple block transfers.
29
30 There are three main types of request, commands, reads and writes.
31
32 Commands are straight forward. The command is submitted to the controller and
33 the request function returns. When the controller generates an interrupt to indicate
34 the command is finished, the response to the command are read and the mmc_request_done
35 function called to end the request.
36
37 Reads and writes work in a similar manner to normal commands but involve the PDC (DMA)
38 controller to manage the transfers.
39
40 A read is done from the controller directly to the scatterlist passed in from the request.
41 Due to a bug in the AT91RM9200 controller, when a read is completed, all the words are byte
42 swapped in the scatterlist buffers. AT91SAM926x are not affected by this bug.
43
44 The sequence of read interrupts is: ENDRX, RXBUFF, CMDRDY
45
46 A write is slightly different in that the bytes to write are read from the scatterlist
47 into a dma memory buffer (this is in case the source buffer should be read only). The
48 entire write buffer is then done from this single dma memory buffer.
49
50 The sequence of write interrupts is: ENDTX, TXBUFE, NOTBUSY, CMDRDY
51
52 GET RO
53 Gets the status of the write protect pin, if available.
54 */
55
56 #include <linux/module.h>
57 #include <linux/moduleparam.h>
58 #include <linux/init.h>
59 #include <linux/ioport.h>
60 #include <linux/platform_device.h>
61 #include <linux/interrupt.h>
62 #include <linux/blkdev.h>
63 #include <linux/delay.h>
64 #include <linux/err.h>
65 #include <linux/dma-mapping.h>
66 #include <linux/clk.h>
67 #include <linux/atmel_pdc.h>
68 #include <linux/gfp.h>
69 #include <linux/highmem.h>
70
71 #include <linux/mmc/host.h>
72 #include <linux/mmc/sdio.h>
73
74 #include <asm/io.h>
75 #include <asm/irq.h>
76 #include <asm/gpio.h>
77
78 #include <mach/board.h>
79 #include <mach/cpu.h>
80 #include <mach/at91_mci.h>
81
82 #define DRIVER_NAME "at91_mci"
83
84 static inline int at91mci_is_mci1rev2xx(void)
85 {
86 return ( cpu_is_at91sam9260()
87 || cpu_is_at91sam9263()
88 || cpu_is_at91cap9()
89 || cpu_is_at91sam9rl()
90 || cpu_is_at91sam9g10()
91 || cpu_is_at91sam9g20()
92 );
93 }
94
95 #define FL_SENT_COMMAND (1 << 0)
96 #define FL_SENT_STOP (1 << 1)
97
98 #define AT91_MCI_ERRORS (AT91_MCI_RINDE | AT91_MCI_RDIRE | AT91_MCI_RCRCE \
99 | AT91_MCI_RENDE | AT91_MCI_RTOE | AT91_MCI_DCRCE \
100 | AT91_MCI_DTOE | AT91_MCI_OVRE | AT91_MCI_UNRE)
101
102 #define at91_mci_read(host, reg) __raw_readl((host)->baseaddr + (reg))
103 #define at91_mci_write(host, reg, val) __raw_writel((val), (host)->baseaddr + (reg))
104
105 #define MCI_BLKSIZE 512
106 #define MCI_MAXBLKSIZE 4095
107 #define MCI_BLKATONCE 256
108 #define MCI_BUFSIZE (MCI_BLKSIZE * MCI_BLKATONCE)
109
110 /*
111 * Low level type for this driver
112 */
113 struct at91mci_host
114 {
115 struct mmc_host *mmc;
116 struct mmc_command *cmd;
117 struct mmc_request *request;
118
119 void __iomem *baseaddr;
120 int irq;
121
122 struct at91_mmc_data *board;
123 int present;
124
125 struct clk *mci_clk;
126
127 /*
128 * Flag indicating when the command has been sent. This is used to
129 * work out whether or not to send the stop
130 */
131 unsigned int flags;
132 /* flag for current bus settings */
133 u32 bus_mode;
134
135 /* DMA buffer used for transmitting */
136 unsigned int* buffer;
137 dma_addr_t physical_address;
138 unsigned int total_length;
139
140 /* Latest in the scatterlist that has been enabled for transfer, but not freed */
141 int in_use_index;
142
143 /* Latest in the scatterlist that has been enabled for transfer */
144 int transfer_index;
145
146 /* Timer for timeouts */
147 struct timer_list timer;
148 };
149
150 /*
151 * Reset the controller and restore most of the state
152 */
153 static void at91_reset_host(struct at91mci_host *host)
154 {
155 unsigned long flags;
156 u32 mr;
157 u32 sdcr;
158 u32 dtor;
159 u32 imr;
160
161 local_irq_save(flags);
162 imr = at91_mci_read(host, AT91_MCI_IMR);
163
164 at91_mci_write(host, AT91_MCI_IDR, 0xffffffff);
165
166 /* save current state */
167 mr = at91_mci_read(host, AT91_MCI_MR) & 0x7fff;
168 sdcr = at91_mci_read(host, AT91_MCI_SDCR);
169 dtor = at91_mci_read(host, AT91_MCI_DTOR);
170
171 /* reset the controller */
172 at91_mci_write(host, AT91_MCI_CR, AT91_MCI_MCIDIS | AT91_MCI_SWRST);
173
174 /* restore state */
175 at91_mci_write(host, AT91_MCI_CR, AT91_MCI_MCIEN);
176 at91_mci_write(host, AT91_MCI_MR, mr);
177 at91_mci_write(host, AT91_MCI_SDCR, sdcr);
178 at91_mci_write(host, AT91_MCI_DTOR, dtor);
179 at91_mci_write(host, AT91_MCI_IER, imr);
180
181 /* make sure sdio interrupts will fire */
182 at91_mci_read(host, AT91_MCI_SR);
183
184 local_irq_restore(flags);
185 }
186
187 static void at91_timeout_timer(unsigned long data)
188 {
189 struct at91mci_host *host;
190
191 host = (struct at91mci_host *)data;
192
193 if (host->request) {
194 dev_err(host->mmc->parent, "Timeout waiting end of packet\n");
195
196 if (host->cmd && host->cmd->data) {
197 host->cmd->data->error = -ETIMEDOUT;
198 } else {
199 if (host->cmd)
200 host->cmd->error = -ETIMEDOUT;
201 else
202 host->request->cmd->error = -ETIMEDOUT;
203 }
204
205 at91_reset_host(host);
206 mmc_request_done(host->mmc, host->request);
207 }
208 }
209
210 /*
211 * Copy from sg to a dma block - used for transfers
212 */
213 static inline void at91_mci_sg_to_dma(struct at91mci_host *host, struct mmc_data *data)
214 {
215 unsigned int len, i, size;
216 unsigned *dmabuf = host->buffer;
217
218 size = data->blksz * data->blocks;
219 len = data->sg_len;
220
221 /* MCI1 rev2xx Data Write Operation and number of bytes erratum */
222 if (at91mci_is_mci1rev2xx())
223 if (host->total_length == 12)
224 memset(dmabuf, 0, 12);
225
226 /*
227 * Just loop through all entries. Size might not
228 * be the entire list though so make sure that
229 * we do not transfer too much.
230 */
231 for (i = 0; i < len; i++) {
232 struct scatterlist *sg;
233 int amount;
234 unsigned int *sgbuffer;
235
236 sg = &data->sg[i];
237
238 sgbuffer = kmap_atomic(sg_page(sg), KM_BIO_SRC_IRQ) + sg->offset;
239 amount = min(size, sg->length);
240 size -= amount;
241
242 if (cpu_is_at91rm9200()) { /* AT91RM9200 errata */
243 int index;
244
245 for (index = 0; index < (amount / 4); index++)
246 *dmabuf++ = swab32(sgbuffer[index]);
247 } else {
248 char *tmpv = (char *)dmabuf;
249 memcpy(tmpv, sgbuffer, amount);
250 tmpv += amount;
251 dmabuf = (unsigned *)tmpv;
252 }
253
254 kunmap_atomic(sgbuffer, KM_BIO_SRC_IRQ);
255
256 if (size == 0)
257 break;
258 }
259
260 /*
261 * Check that we didn't get a request to transfer
262 * more data than can fit into the SG list.
263 */
264 BUG_ON(size != 0);
265 }
266
267 /*
268 * Handle after a dma read
269 */
270 static void at91_mci_post_dma_read(struct at91mci_host *host)
271 {
272 struct mmc_command *cmd;
273 struct mmc_data *data;
274 unsigned int len, i, size;
275 unsigned *dmabuf = host->buffer;
276
277 pr_debug("post dma read\n");
278
279 cmd = host->cmd;
280 if (!cmd) {
281 pr_debug("no command\n");
282 return;
283 }
284
285 data = cmd->data;
286 if (!data) {
287 pr_debug("no data\n");
288 return;
289 }
290
291 size = data->blksz * data->blocks;
292 len = data->sg_len;
293
294 at91_mci_write(host, AT91_MCI_IDR, AT91_MCI_ENDRX);
295 at91_mci_write(host, AT91_MCI_IER, AT91_MCI_RXBUFF);
296
297 for (i = 0; i < len; i++) {
298 struct scatterlist *sg;
299 int amount;
300 unsigned int *sgbuffer;
301
302 sg = &data->sg[i];
303
304 sgbuffer = kmap_atomic(sg_page(sg), KM_BIO_SRC_IRQ) + sg->offset;
305 amount = min(size, sg->length);
306 size -= amount;
307
308 if (cpu_is_at91rm9200()) { /* AT91RM9200 errata */
309 int index;
310 for (index = 0; index < (amount / 4); index++)
311 sgbuffer[index] = swab32(*dmabuf++);
312 } else {
313 char *tmpv = (char *)dmabuf;
314 memcpy(sgbuffer, tmpv, amount);
315 tmpv += amount;
316 dmabuf = (unsigned *)tmpv;
317 }
318
319 flush_kernel_dcache_page(sg_page(sg));
320 kunmap_atomic(sgbuffer, KM_BIO_SRC_IRQ);
321 data->bytes_xfered += amount;
322 if (size == 0)
323 break;
324 }
325
326 pr_debug("post dma read done\n");
327 }
328
329 /*
330 * Handle transmitted data
331 */
332 static void at91_mci_handle_transmitted(struct at91mci_host *host)
333 {
334 struct mmc_command *cmd;
335 struct mmc_data *data;
336
337 pr_debug("Handling the transmit\n");
338
339 /* Disable the transfer */
340 at91_mci_write(host, ATMEL_PDC_PTCR, ATMEL_PDC_RXTDIS | ATMEL_PDC_TXTDIS);
341
342 /* Now wait for cmd ready */
343 at91_mci_write(host, AT91_MCI_IDR, AT91_MCI_TXBUFE);
344
345 cmd = host->cmd;
346 if (!cmd) return;
347
348 data = cmd->data;
349 if (!data) return;
350
351 if (cmd->data->blocks > 1) {
352 pr_debug("multiple write : wait for BLKE...\n");
353 at91_mci_write(host, AT91_MCI_IER, AT91_MCI_BLKE);
354 } else
355 at91_mci_write(host, AT91_MCI_IER, AT91_MCI_NOTBUSY);
356 }
357
358 /*
359 * Update bytes tranfered count during a write operation
360 */
361 static void at91_mci_update_bytes_xfered(struct at91mci_host *host)
362 {
363 struct mmc_data *data;
364
365 /* always deal with the effective request (and not the current cmd) */
366
367 if (host->request->cmd && host->request->cmd->error != 0)
368 return;
369
370 if (host->request->data) {
371 data = host->request->data;
372 if (data->flags & MMC_DATA_WRITE) {
373 /* card is in IDLE mode now */
374 pr_debug("-> bytes_xfered %d, total_length = %d\n",
375 data->bytes_xfered, host->total_length);
376 data->bytes_xfered = data->blksz * data->blocks;
377 }
378 }
379 }
380
381
382 /*Handle after command sent ready*/
383 static int at91_mci_handle_cmdrdy(struct at91mci_host *host)
384 {
385 if (!host->cmd)
386 return 1;
387 else if (!host->cmd->data) {
388 if (host->flags & FL_SENT_STOP) {
389 /*After multi block write, we must wait for NOTBUSY*/
390 at91_mci_write(host, AT91_MCI_IER, AT91_MCI_NOTBUSY);
391 } else return 1;
392 } else if (host->cmd->data->flags & MMC_DATA_WRITE) {
393 /*After sendding multi-block-write command, start DMA transfer*/
394 at91_mci_write(host, AT91_MCI_IER, AT91_MCI_TXBUFE | AT91_MCI_BLKE);
395 at91_mci_write(host, ATMEL_PDC_PTCR, ATMEL_PDC_TXTEN);
396 }
397
398 /* command not completed, have to wait */
399 return 0;
400 }
401
402
403 /*
404 * Enable the controller
405 */
406 static void at91_mci_enable(struct at91mci_host *host)
407 {
408 unsigned int mr;
409
410 at91_mci_write(host, AT91_MCI_CR, AT91_MCI_MCIEN);
411 at91_mci_write(host, AT91_MCI_IDR, 0xffffffff);
412 at91_mci_write(host, AT91_MCI_DTOR, AT91_MCI_DTOMUL_1M | AT91_MCI_DTOCYC);
413 mr = AT91_MCI_PDCMODE | 0x34a;
414
415 if (at91mci_is_mci1rev2xx())
416 mr |= AT91_MCI_RDPROOF | AT91_MCI_WRPROOF;
417
418 at91_mci_write(host, AT91_MCI_MR, mr);
419
420 /* use Slot A or B (only one at same time) */
421 at91_mci_write(host, AT91_MCI_SDCR, host->board->slot_b);
422 }
423
424 /*
425 * Disable the controller
426 */
427 static void at91_mci_disable(struct at91mci_host *host)
428 {
429 at91_mci_write(host, AT91_MCI_CR, AT91_MCI_MCIDIS | AT91_MCI_SWRST);
430 }
431
432 /*
433 * Send a command
434 */
435 static void at91_mci_send_command(struct at91mci_host *host, struct mmc_command *cmd)
436 {
437 unsigned int cmdr, mr;
438 unsigned int block_length;
439 struct mmc_data *data = cmd->data;
440
441 unsigned int blocks;
442 unsigned int ier = 0;
443
444 host->cmd = cmd;
445
446 /* Needed for leaving busy state before CMD1 */
447 if ((at91_mci_read(host, AT91_MCI_SR) & AT91_MCI_RTOE) && (cmd->opcode == 1)) {
448 pr_debug("Clearing timeout\n");
449 at91_mci_write(host, AT91_MCI_ARGR, 0);
450 at91_mci_write(host, AT91_MCI_CMDR, AT91_MCI_OPDCMD);
451 while (!(at91_mci_read(host, AT91_MCI_SR) & AT91_MCI_CMDRDY)) {
452 /* spin */
453 pr_debug("Clearing: SR = %08X\n", at91_mci_read(host, AT91_MCI_SR));
454 }
455 }
456
457 cmdr = cmd->opcode;
458
459 if (mmc_resp_type(cmd) == MMC_RSP_NONE)
460 cmdr |= AT91_MCI_RSPTYP_NONE;
461 else {
462 /* if a response is expected then allow maximum response latancy */
463 cmdr |= AT91_MCI_MAXLAT;
464 /* set 136 bit response for R2, 48 bit response otherwise */
465 if (mmc_resp_type(cmd) == MMC_RSP_R2)
466 cmdr |= AT91_MCI_RSPTYP_136;
467 else
468 cmdr |= AT91_MCI_RSPTYP_48;
469 }
470
471 if (data) {
472
473 if (cpu_is_at91rm9200() || cpu_is_at91sam9261()) {
474 if (data->blksz & 0x3) {
475 pr_debug("Unsupported block size\n");
476 cmd->error = -EINVAL;
477 mmc_request_done(host->mmc, host->request);
478 return;
479 }
480 if (data->flags & MMC_DATA_STREAM) {
481 pr_debug("Stream commands not supported\n");
482 cmd->error = -EINVAL;
483 mmc_request_done(host->mmc, host->request);
484 return;
485 }
486 }
487
488 block_length = data->blksz;
489 blocks = data->blocks;
490
491 /* always set data start - also set direction flag for read */
492 if (data->flags & MMC_DATA_READ)
493 cmdr |= (AT91_MCI_TRDIR | AT91_MCI_TRCMD_START);
494 else if (data->flags & MMC_DATA_WRITE)
495 cmdr |= AT91_MCI_TRCMD_START;
496
497 if (cmd->opcode == SD_IO_RW_EXTENDED) {
498 cmdr |= AT91_MCI_TRTYP_SDIO_BLOCK;
499 } else {
500 if (data->flags & MMC_DATA_STREAM)
501 cmdr |= AT91_MCI_TRTYP_STREAM;
502 if (data->blocks > 1)
503 cmdr |= AT91_MCI_TRTYP_MULTIPLE;
504 }
505 }
506 else {
507 block_length = 0;
508 blocks = 0;
509 }
510
511 if (host->flags & FL_SENT_STOP)
512 cmdr |= AT91_MCI_TRCMD_STOP;
513
514 if (host->bus_mode == MMC_BUSMODE_OPENDRAIN)
515 cmdr |= AT91_MCI_OPDCMD;
516
517 /*
518 * Set the arguments and send the command
519 */
520 pr_debug("Sending command %d as %08X, arg = %08X, blocks = %d, length = %d (MR = %08X)\n",
521 cmd->opcode, cmdr, cmd->arg, blocks, block_length, at91_mci_read(host, AT91_MCI_MR));
522
523 if (!data) {
524 at91_mci_write(host, ATMEL_PDC_PTCR, ATMEL_PDC_TXTDIS | ATMEL_PDC_RXTDIS);
525 at91_mci_write(host, ATMEL_PDC_RPR, 0);
526 at91_mci_write(host, ATMEL_PDC_RCR, 0);
527 at91_mci_write(host, ATMEL_PDC_RNPR, 0);
528 at91_mci_write(host, ATMEL_PDC_RNCR, 0);
529 at91_mci_write(host, ATMEL_PDC_TPR, 0);
530 at91_mci_write(host, ATMEL_PDC_TCR, 0);
531 at91_mci_write(host, ATMEL_PDC_TNPR, 0);
532 at91_mci_write(host, ATMEL_PDC_TNCR, 0);
533 ier = AT91_MCI_CMDRDY;
534 } else {
535 /* zero block length and PDC mode */
536 mr = at91_mci_read(host, AT91_MCI_MR) & 0x5fff;
537 mr |= (data->blksz & 0x3) ? AT91_MCI_PDCFBYTE : 0;
538 mr |= (block_length << 16);
539 mr |= AT91_MCI_PDCMODE;
540 at91_mci_write(host, AT91_MCI_MR, mr);
541
542 if (!(cpu_is_at91rm9200() || cpu_is_at91sam9261()))
543 at91_mci_write(host, AT91_MCI_BLKR,
544 AT91_MCI_BLKR_BCNT(blocks) |
545 AT91_MCI_BLKR_BLKLEN(block_length));
546
547 /*
548 * Disable the PDC controller
549 */
550 at91_mci_write(host, ATMEL_PDC_PTCR, ATMEL_PDC_RXTDIS | ATMEL_PDC_TXTDIS);
551
552 if (cmdr & AT91_MCI_TRCMD_START) {
553 data->bytes_xfered = 0;
554 host->transfer_index = 0;
555 host->in_use_index = 0;
556 if (cmdr & AT91_MCI_TRDIR) {
557 /*
558 * Handle a read
559 */
560 host->total_length = 0;
561
562 at91_mci_write(host, ATMEL_PDC_RPR, host->physical_address);
563 at91_mci_write(host, ATMEL_PDC_RCR, (data->blksz & 0x3) ?
564 (blocks * block_length) : (blocks * block_length) / 4);
565 at91_mci_write(host, ATMEL_PDC_RNPR, 0);
566 at91_mci_write(host, ATMEL_PDC_RNCR, 0);
567
568 ier = AT91_MCI_ENDRX /* | AT91_MCI_RXBUFF */;
569 }
570 else {
571 /*
572 * Handle a write
573 */
574 host->total_length = block_length * blocks;
575 /*
576 * MCI1 rev2xx Data Write Operation and
577 * number of bytes erratum
578 */
579 if (at91mci_is_mci1rev2xx())
580 if (host->total_length < 12)
581 host->total_length = 12;
582
583 at91_mci_sg_to_dma(host, data);
584
585 pr_debug("Transmitting %d bytes\n", host->total_length);
586
587 at91_mci_write(host, ATMEL_PDC_TPR, host->physical_address);
588 at91_mci_write(host, ATMEL_PDC_TCR, (data->blksz & 0x3) ?
589 host->total_length : host->total_length / 4);
590
591 ier = AT91_MCI_CMDRDY;
592 }
593 }
594 }
595
596 /*
597 * Send the command and then enable the PDC - not the other way round as
598 * the data sheet says
599 */
600
601 at91_mci_write(host, AT91_MCI_ARGR, cmd->arg);
602 at91_mci_write(host, AT91_MCI_CMDR, cmdr);
603
604 if (cmdr & AT91_MCI_TRCMD_START) {
605 if (cmdr & AT91_MCI_TRDIR)
606 at91_mci_write(host, ATMEL_PDC_PTCR, ATMEL_PDC_RXTEN);
607 }
608
609 /* Enable selected interrupts */
610 at91_mci_write(host, AT91_MCI_IER, AT91_MCI_ERRORS | ier);
611 }
612
613 /*
614 * Process the next step in the request
615 */
616 static void at91_mci_process_next(struct at91mci_host *host)
617 {
618 if (!(host->flags & FL_SENT_COMMAND)) {
619 host->flags |= FL_SENT_COMMAND;
620 at91_mci_send_command(host, host->request->cmd);
621 }
622 else if ((!(host->flags & FL_SENT_STOP)) && host->request->stop) {
623 host->flags |= FL_SENT_STOP;
624 at91_mci_send_command(host, host->request->stop);
625 } else {
626 del_timer(&host->timer);
627 /* the at91rm9200 mci controller hangs after some transfers,
628 * and the workaround is to reset it after each transfer.
629 */
630 if (cpu_is_at91rm9200())
631 at91_reset_host(host);
632 mmc_request_done(host->mmc, host->request);
633 }
634 }
635
636 /*
637 * Handle a command that has been completed
638 */
639 static void at91_mci_completed_command(struct at91mci_host *host, unsigned int status)
640 {
641 struct mmc_command *cmd = host->cmd;
642 struct mmc_data *data = cmd->data;
643
644 at91_mci_write(host, AT91_MCI_IDR, 0xffffffff & ~(AT91_MCI_SDIOIRQA | AT91_MCI_SDIOIRQB));
645
646 cmd->resp[0] = at91_mci_read(host, AT91_MCI_RSPR(0));
647 cmd->resp[1] = at91_mci_read(host, AT91_MCI_RSPR(1));
648 cmd->resp[2] = at91_mci_read(host, AT91_MCI_RSPR(2));
649 cmd->resp[3] = at91_mci_read(host, AT91_MCI_RSPR(3));
650
651 pr_debug("Status = %08X/%08x [%08X %08X %08X %08X]\n",
652 status, at91_mci_read(host, AT91_MCI_SR),
653 cmd->resp[0], cmd->resp[1], cmd->resp[2], cmd->resp[3]);
654
655 if (status & AT91_MCI_ERRORS) {
656 if ((status & AT91_MCI_RCRCE) && !(mmc_resp_type(cmd) & MMC_RSP_CRC)) {
657 cmd->error = 0;
658 }
659 else {
660 if (status & (AT91_MCI_DTOE | AT91_MCI_DCRCE)) {
661 if (data) {
662 if (status & AT91_MCI_DTOE)
663 data->error = -ETIMEDOUT;
664 else if (status & AT91_MCI_DCRCE)
665 data->error = -EILSEQ;
666 }
667 } else {
668 if (status & AT91_MCI_RTOE)
669 cmd->error = -ETIMEDOUT;
670 else if (status & AT91_MCI_RCRCE)
671 cmd->error = -EILSEQ;
672 else
673 cmd->error = -EIO;
674 }
675
676 pr_debug("Error detected and set to %d/%d (cmd = %d, retries = %d)\n",
677 cmd->error, data ? data->error : 0,
678 cmd->opcode, cmd->retries);
679 }
680 }
681 else
682 cmd->error = 0;
683
684 at91_mci_process_next(host);
685 }
686
687 /*
688 * Handle an MMC request
689 */
690 static void at91_mci_request(struct mmc_host *mmc, struct mmc_request *mrq)
691 {
692 struct at91mci_host *host = mmc_priv(mmc);
693 host->request = mrq;
694 host->flags = 0;
695
696 /* more than 1s timeout needed with slow SD cards */
697 mod_timer(&host->timer, jiffies + msecs_to_jiffies(2000));
698
699 at91_mci_process_next(host);
700 }
701
702 /*
703 * Set the IOS
704 */
705 static void at91_mci_set_ios(struct mmc_host *mmc, struct mmc_ios *ios)
706 {
707 int clkdiv;
708 struct at91mci_host *host = mmc_priv(mmc);
709 unsigned long at91_master_clock = clk_get_rate(host->mci_clk);
710
711 host->bus_mode = ios->bus_mode;
712
713 if (ios->clock == 0) {
714 /* Disable the MCI controller */
715 at91_mci_write(host, AT91_MCI_CR, AT91_MCI_MCIDIS);
716 clkdiv = 0;
717 }
718 else {
719 /* Enable the MCI controller */
720 at91_mci_write(host, AT91_MCI_CR, AT91_MCI_MCIEN);
721
722 if ((at91_master_clock % (ios->clock * 2)) == 0)
723 clkdiv = ((at91_master_clock / ios->clock) / 2) - 1;
724 else
725 clkdiv = (at91_master_clock / ios->clock) / 2;
726
727 pr_debug("clkdiv = %d. mcck = %ld\n", clkdiv,
728 at91_master_clock / (2 * (clkdiv + 1)));
729 }
730 if (ios->bus_width == MMC_BUS_WIDTH_4 && host->board->wire4) {
731 pr_debug("MMC: Setting controller bus width to 4\n");
732 at91_mci_write(host, AT91_MCI_SDCR, at91_mci_read(host, AT91_MCI_SDCR) | AT91_MCI_SDCBUS);
733 }
734 else {
735 pr_debug("MMC: Setting controller bus width to 1\n");
736 at91_mci_write(host, AT91_MCI_SDCR, at91_mci_read(host, AT91_MCI_SDCR) & ~AT91_MCI_SDCBUS);
737 }
738
739 /* Set the clock divider */
740 at91_mci_write(host, AT91_MCI_MR, (at91_mci_read(host, AT91_MCI_MR) & ~AT91_MCI_CLKDIV) | clkdiv);
741
742 /* maybe switch power to the card */
743 if (host->board->vcc_pin) {
744 switch (ios->power_mode) {
745 case MMC_POWER_OFF:
746 gpio_set_value(host->board->vcc_pin, 0);
747 break;
748 case MMC_POWER_UP:
749 gpio_set_value(host->board->vcc_pin, 1);
750 break;
751 case MMC_POWER_ON:
752 break;
753 default:
754 WARN_ON(1);
755 }
756 }
757 }
758
759 /*
760 * Handle an interrupt
761 */
762 static irqreturn_t at91_mci_irq(int irq, void *devid)
763 {
764 struct at91mci_host *host = devid;
765 int completed = 0;
766 unsigned int int_status, int_mask;
767
768 int_status = at91_mci_read(host, AT91_MCI_SR);
769 int_mask = at91_mci_read(host, AT91_MCI_IMR);
770
771 pr_debug("MCI irq: status = %08X, %08X, %08X\n", int_status, int_mask,
772 int_status & int_mask);
773
774 int_status = int_status & int_mask;
775
776 if (int_status & AT91_MCI_ERRORS) {
777 completed = 1;
778
779 if (int_status & AT91_MCI_UNRE)
780 pr_debug("MMC: Underrun error\n");
781 if (int_status & AT91_MCI_OVRE)
782 pr_debug("MMC: Overrun error\n");
783 if (int_status & AT91_MCI_DTOE)
784 pr_debug("MMC: Data timeout\n");
785 if (int_status & AT91_MCI_DCRCE)
786 pr_debug("MMC: CRC error in data\n");
787 if (int_status & AT91_MCI_RTOE)
788 pr_debug("MMC: Response timeout\n");
789 if (int_status & AT91_MCI_RENDE)
790 pr_debug("MMC: Response end bit error\n");
791 if (int_status & AT91_MCI_RCRCE)
792 pr_debug("MMC: Response CRC error\n");
793 if (int_status & AT91_MCI_RDIRE)
794 pr_debug("MMC: Response direction error\n");
795 if (int_status & AT91_MCI_RINDE)
796 pr_debug("MMC: Response index error\n");
797 } else {
798 /* Only continue processing if no errors */
799
800 if (int_status & AT91_MCI_TXBUFE) {
801 pr_debug("TX buffer empty\n");
802 at91_mci_handle_transmitted(host);
803 }
804
805 if (int_status & AT91_MCI_ENDRX) {
806 pr_debug("ENDRX\n");
807 at91_mci_post_dma_read(host);
808 }
809
810 if (int_status & AT91_MCI_RXBUFF) {
811 pr_debug("RX buffer full\n");
812 at91_mci_write(host, ATMEL_PDC_PTCR, ATMEL_PDC_RXTDIS | ATMEL_PDC_TXTDIS);
813 at91_mci_write(host, AT91_MCI_IDR, AT91_MCI_RXBUFF | AT91_MCI_ENDRX);
814 completed = 1;
815 }
816
817 if (int_status & AT91_MCI_ENDTX)
818 pr_debug("Transmit has ended\n");
819
820 if (int_status & AT91_MCI_NOTBUSY) {
821 pr_debug("Card is ready\n");
822 at91_mci_update_bytes_xfered(host);
823 completed = 1;
824 }
825
826 if (int_status & AT91_MCI_DTIP)
827 pr_debug("Data transfer in progress\n");
828
829 if (int_status & AT91_MCI_BLKE) {
830 pr_debug("Block transfer has ended\n");
831 if (host->request->data && host->request->data->blocks > 1) {
832 /* multi block write : complete multi write
833 * command and send stop */
834 completed = 1;
835 } else {
836 at91_mci_write(host, AT91_MCI_IER, AT91_MCI_NOTBUSY);
837 }
838 }
839
840 if (int_status & AT91_MCI_SDIOIRQA)
841 mmc_signal_sdio_irq(host->mmc);
842
843 if (int_status & AT91_MCI_SDIOIRQB)
844 mmc_signal_sdio_irq(host->mmc);
845
846 if (int_status & AT91_MCI_TXRDY)
847 pr_debug("Ready to transmit\n");
848
849 if (int_status & AT91_MCI_RXRDY)
850 pr_debug("Ready to receive\n");
851
852 if (int_status & AT91_MCI_CMDRDY) {
853 pr_debug("Command ready\n");
854 completed = at91_mci_handle_cmdrdy(host);
855 }
856 }
857
858 if (completed) {
859 pr_debug("Completed command\n");
860 at91_mci_write(host, AT91_MCI_IDR, 0xffffffff & ~(AT91_MCI_SDIOIRQA | AT91_MCI_SDIOIRQB));
861 at91_mci_completed_command(host, int_status);
862 } else
863 at91_mci_write(host, AT91_MCI_IDR, int_status & ~(AT91_MCI_SDIOIRQA | AT91_MCI_SDIOIRQB));
864
865 return IRQ_HANDLED;
866 }
867
868 static irqreturn_t at91_mmc_det_irq(int irq, void *_host)
869 {
870 struct at91mci_host *host = _host;
871 int present = !gpio_get_value(irq_to_gpio(irq));
872
873 /*
874 * we expect this irq on both insert and remove,
875 * and use a short delay to debounce.
876 */
877 if (present != host->present) {
878 host->present = present;
879 pr_debug("%s: card %s\n", mmc_hostname(host->mmc),
880 present ? "insert" : "remove");
881 if (!present) {
882 pr_debug("****** Resetting SD-card bus width ******\n");
883 at91_mci_write(host, AT91_MCI_SDCR, at91_mci_read(host, AT91_MCI_SDCR) & ~AT91_MCI_SDCBUS);
884 }
885 /* 0.5s needed because of early card detect switch firing */
886 mmc_detect_change(host->mmc, msecs_to_jiffies(500));
887 }
888 return IRQ_HANDLED;
889 }
890
891 static int at91_mci_get_ro(struct mmc_host *mmc)
892 {
893 struct at91mci_host *host = mmc_priv(mmc);
894
895 if (host->board->wp_pin)
896 return !!gpio_get_value(host->board->wp_pin);
897 /*
898 * Board doesn't support read only detection; let the mmc core
899 * decide what to do.
900 */
901 return -ENOSYS;
902 }
903
904 static void at91_mci_enable_sdio_irq(struct mmc_host *mmc, int enable)
905 {
906 struct at91mci_host *host = mmc_priv(mmc);
907
908 pr_debug("%s: sdio_irq %c : %s\n", mmc_hostname(host->mmc),
909 host->board->slot_b ? 'B':'A', enable ? "enable" : "disable");
910 at91_mci_write(host, enable ? AT91_MCI_IER : AT91_MCI_IDR,
911 host->board->slot_b ? AT91_MCI_SDIOIRQB : AT91_MCI_SDIOIRQA);
912
913 }
914
915 static const struct mmc_host_ops at91_mci_ops = {
916 .request = at91_mci_request,
917 .set_ios = at91_mci_set_ios,
918 .get_ro = at91_mci_get_ro,
919 .enable_sdio_irq = at91_mci_enable_sdio_irq,
920 };
921
922 /*
923 * Probe for the device
924 */
925 static int __init at91_mci_probe(struct platform_device *pdev)
926 {
927 struct mmc_host *mmc;
928 struct at91mci_host *host;
929 struct resource *res;
930 int ret;
931
932 res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
933 if (!res)
934 return -ENXIO;
935
936 if (!request_mem_region(res->start, resource_size(res), DRIVER_NAME))
937 return -EBUSY;
938
939 mmc = mmc_alloc_host(sizeof(struct at91mci_host), &pdev->dev);
940 if (!mmc) {
941 ret = -ENOMEM;
942 dev_dbg(&pdev->dev, "couldn't allocate mmc host\n");
943 goto fail6;
944 }
945
946 mmc->ops = &at91_mci_ops;
947 mmc->f_min = 375000;
948 mmc->f_max = 25000000;
949 mmc->ocr_avail = MMC_VDD_32_33 | MMC_VDD_33_34;
950 mmc->caps = 0;
951
952 mmc->max_blk_size = MCI_MAXBLKSIZE;
953 mmc->max_blk_count = MCI_BLKATONCE;
954 mmc->max_req_size = MCI_BUFSIZE;
955 mmc->max_segs = MCI_BLKATONCE;
956 mmc->max_seg_size = MCI_BUFSIZE;
957
958 host = mmc_priv(mmc);
959 host->mmc = mmc;
960 host->bus_mode = 0;
961 host->board = pdev->dev.platform_data;
962 if (host->board->wire4) {
963 if (at91mci_is_mci1rev2xx())
964 mmc->caps |= MMC_CAP_4_BIT_DATA;
965 else
966 dev_warn(&pdev->dev, "4 wire bus mode not supported"
967 " - using 1 wire\n");
968 }
969
970 host->buffer = dma_alloc_coherent(&pdev->dev, MCI_BUFSIZE,
971 &host->physical_address, GFP_KERNEL);
972 if (!host->buffer) {
973 ret = -ENOMEM;
974 dev_err(&pdev->dev, "Can't allocate transmit buffer\n");
975 goto fail5;
976 }
977
978 /* Add SDIO capability when available */
979 if (at91mci_is_mci1rev2xx()) {
980 /* at91mci MCI1 rev2xx sdio interrupt erratum */
981 if (host->board->wire4 || !host->board->slot_b)
982 mmc->caps |= MMC_CAP_SDIO_IRQ;
983 }
984
985 /*
986 * Reserve GPIOs ... board init code makes sure these pins are set
987 * up as GPIOs with the right direction (input, except for vcc)
988 */
989 if (host->board->det_pin) {
990 ret = gpio_request(host->board->det_pin, "mmc_detect");
991 if (ret < 0) {
992 dev_dbg(&pdev->dev, "couldn't claim card detect pin\n");
993 goto fail4b;
994 }
995 }
996 if (host->board->wp_pin) {
997 ret = gpio_request(host->board->wp_pin, "mmc_wp");
998 if (ret < 0) {
999 dev_dbg(&pdev->dev, "couldn't claim wp sense pin\n");
1000 goto fail4;
1001 }
1002 }
1003 if (host->board->vcc_pin) {
1004 ret = gpio_request(host->board->vcc_pin, "mmc_vcc");
1005 if (ret < 0) {
1006 dev_dbg(&pdev->dev, "couldn't claim vcc switch pin\n");
1007 goto fail3;
1008 }
1009 }
1010
1011 /*
1012 * Get Clock
1013 */
1014 host->mci_clk = clk_get(&pdev->dev, "mci_clk");
1015 if (IS_ERR(host->mci_clk)) {
1016 ret = -ENODEV;
1017 dev_dbg(&pdev->dev, "no mci_clk?\n");
1018 goto fail2;
1019 }
1020
1021 /*
1022 * Map I/O region
1023 */
1024 host->baseaddr = ioremap(res->start, resource_size(res));
1025 if (!host->baseaddr) {
1026 ret = -ENOMEM;
1027 goto fail1;
1028 }
1029
1030 /*
1031 * Reset hardware
1032 */
1033 clk_enable(host->mci_clk); /* Enable the peripheral clock */
1034 at91_mci_disable(host);
1035 at91_mci_enable(host);
1036
1037 /*
1038 * Allocate the MCI interrupt
1039 */
1040 host->irq = platform_get_irq(pdev, 0);
1041 ret = request_irq(host->irq, at91_mci_irq, IRQF_SHARED,
1042 mmc_hostname(mmc), host);
1043 if (ret) {
1044 dev_dbg(&pdev->dev, "request MCI interrupt failed\n");
1045 goto fail0;
1046 }
1047
1048 setup_timer(&host->timer, at91_timeout_timer, (unsigned long)host);
1049
1050 platform_set_drvdata(pdev, mmc);
1051
1052 /*
1053 * Add host to MMC layer
1054 */
1055 if (host->board->det_pin) {
1056 host->present = !gpio_get_value(host->board->det_pin);
1057 }
1058 else
1059 host->present = -1;
1060
1061 mmc_add_host(mmc);
1062
1063 /*
1064 * monitor card insertion/removal if we can
1065 */
1066 if (host->board->det_pin) {
1067 ret = request_irq(gpio_to_irq(host->board->det_pin),
1068 at91_mmc_det_irq, 0, mmc_hostname(mmc), host);
1069 if (ret)
1070 dev_warn(&pdev->dev, "request MMC detect irq failed\n");
1071 else
1072 device_init_wakeup(&pdev->dev, 1);
1073 }
1074
1075 pr_debug("Added MCI driver\n");
1076
1077 return 0;
1078
1079 fail0:
1080 clk_disable(host->mci_clk);
1081 iounmap(host->baseaddr);
1082 fail1:
1083 clk_put(host->mci_clk);
1084 fail2:
1085 if (host->board->vcc_pin)
1086 gpio_free(host->board->vcc_pin);
1087 fail3:
1088 if (host->board->wp_pin)
1089 gpio_free(host->board->wp_pin);
1090 fail4:
1091 if (host->board->det_pin)
1092 gpio_free(host->board->det_pin);
1093 fail4b:
1094 if (host->buffer)
1095 dma_free_coherent(&pdev->dev, MCI_BUFSIZE,
1096 host->buffer, host->physical_address);
1097 fail5:
1098 mmc_free_host(mmc);
1099 fail6:
1100 release_mem_region(res->start, resource_size(res));
1101 dev_err(&pdev->dev, "probe failed, err %d\n", ret);
1102 return ret;
1103 }
1104
1105 /*
1106 * Remove a device
1107 */
1108 static int __exit at91_mci_remove(struct platform_device *pdev)
1109 {
1110 struct mmc_host *mmc = platform_get_drvdata(pdev);
1111 struct at91mci_host *host;
1112 struct resource *res;
1113
1114 if (!mmc)
1115 return -1;
1116
1117 host = mmc_priv(mmc);
1118
1119 if (host->buffer)
1120 dma_free_coherent(&pdev->dev, MCI_BUFSIZE,
1121 host->buffer, host->physical_address);
1122
1123 if (host->board->det_pin) {
1124 if (device_can_wakeup(&pdev->dev))
1125 free_irq(gpio_to_irq(host->board->det_pin), host);
1126 device_init_wakeup(&pdev->dev, 0);
1127 gpio_free(host->board->det_pin);
1128 }
1129
1130 at91_mci_disable(host);
1131 del_timer_sync(&host->timer);
1132 mmc_remove_host(mmc);
1133 free_irq(host->irq, host);
1134
1135 clk_disable(host->mci_clk); /* Disable the peripheral clock */
1136 clk_put(host->mci_clk);
1137
1138 if (host->board->vcc_pin)
1139 gpio_free(host->board->vcc_pin);
1140 if (host->board->wp_pin)
1141 gpio_free(host->board->wp_pin);
1142
1143 iounmap(host->baseaddr);
1144 res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
1145 release_mem_region(res->start, resource_size(res));
1146
1147 mmc_free_host(mmc);
1148 platform_set_drvdata(pdev, NULL);
1149 pr_debug("MCI Removed\n");
1150
1151 return 0;
1152 }
1153
1154 #ifdef CONFIG_PM
1155 static int at91_mci_suspend(struct platform_device *pdev, pm_message_t state)
1156 {
1157 struct mmc_host *mmc = platform_get_drvdata(pdev);
1158 struct at91mci_host *host = mmc_priv(mmc);
1159 int ret = 0;
1160
1161 if (host->board->det_pin && device_may_wakeup(&pdev->dev))
1162 enable_irq_wake(host->board->det_pin);
1163
1164 if (mmc)
1165 ret = mmc_suspend_host(mmc);
1166
1167 return ret;
1168 }
1169
1170 static int at91_mci_resume(struct platform_device *pdev)
1171 {
1172 struct mmc_host *mmc = platform_get_drvdata(pdev);
1173 struct at91mci_host *host = mmc_priv(mmc);
1174 int ret = 0;
1175
1176 if (host->board->det_pin && device_may_wakeup(&pdev->dev))
1177 disable_irq_wake(host->board->det_pin);
1178
1179 if (mmc)
1180 ret = mmc_resume_host(mmc);
1181
1182 return ret;
1183 }
1184 #else
1185 #define at91_mci_suspend NULL
1186 #define at91_mci_resume NULL
1187 #endif
1188
1189 static struct platform_driver at91_mci_driver = {
1190 .remove = __exit_p(at91_mci_remove),
1191 .suspend = at91_mci_suspend,
1192 .resume = at91_mci_resume,
1193 .driver = {
1194 .name = DRIVER_NAME,
1195 .owner = THIS_MODULE,
1196 },
1197 };
1198
1199 static int __init at91_mci_init(void)
1200 {
1201 return platform_driver_probe(&at91_mci_driver, at91_mci_probe);
1202 }
1203
1204 static void __exit at91_mci_exit(void)
1205 {
1206 platform_driver_unregister(&at91_mci_driver);
1207 }
1208
1209 module_init(at91_mci_init);
1210 module_exit(at91_mci_exit);
1211
1212 MODULE_DESCRIPTION("AT91 Multimedia Card Interface driver");
1213 MODULE_AUTHOR("Nick Randell");
1214 MODULE_LICENSE("GPL");
1215 MODULE_ALIAS("platform:at91_mci");
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