2 * linux/drivers/mmc/host/at91_mci.c - ATMEL AT91 MCI Driver
4 * Copyright (C) 2005 Cougar Creek Computing Devices Ltd, All Rights Reserved
6 * Copyright (C) 2006 Malcolm Noyes
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.
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.
18 The three entry points are at91_mci_request, at91_mci_set_ios
22 This configures the device to put it into the correct mode and clock speed
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.
30 There are three main types of request, commands, reads and writes.
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.
37 Reads and writes work in a similar manner to normal commands but involve the PDC (DMA)
38 controller to manage the transfers.
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.
44 The sequence of read interrupts is: ENDRX, RXBUFF, CMDRDY
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.
50 The sequence of write interrupts is: ENDTX, TXBUFE, NOTBUSY, CMDRDY
53 Gets the status of the write protect pin, if available.
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>
69 #include <linux/mmc/host.h>
75 #include <asm/mach/mmc.h>
76 #include <mach/board.h>
78 #include <mach/at91_mci.h>
80 #define DRIVER_NAME "at91_mci"
82 #define FL_SENT_COMMAND (1 << 0)
83 #define FL_SENT_STOP (1 << 1)
85 #define AT91_MCI_ERRORS (AT91_MCI_RINDE | AT91_MCI_RDIRE | AT91_MCI_RCRCE \
86 | AT91_MCI_RENDE | AT91_MCI_RTOE | AT91_MCI_DCRCE \
87 | AT91_MCI_DTOE | AT91_MCI_OVRE | AT91_MCI_UNRE)
89 #define at91_mci_read(host, reg) __raw_readl((host)->baseaddr + (reg))
90 #define at91_mci_write(host, reg, val) __raw_writel((val), (host)->baseaddr + (reg))
94 * Low level type for this driver
99 struct mmc_command *cmd;
100 struct mmc_request *request;
102 void __iomem *baseaddr;
105 struct at91_mmc_data *board;
111 * Flag indicating when the command has been sent. This is used to
112 * work out whether or not to send the stop
115 /* flag for current bus settings */
118 /* DMA buffer used for transmitting */
119 unsigned int* buffer;
120 dma_addr_t physical_address;
121 unsigned int total_length;
123 /* Latest in the scatterlist that has been enabled for transfer, but not freed */
126 /* Latest in the scatterlist that has been enabled for transfer */
129 /* Timer for timeouts */
130 struct timer_list timer;
134 * Reset the controller and restore most of the state
136 static void at91_reset_host(struct at91mci_host *host)
144 local_irq_save(flags);
145 imr = at91_mci_read(host, AT91_MCI_IMR);
147 at91_mci_write(host, AT91_MCI_IDR, 0xffffffff);
149 /* save current state */
150 mr = at91_mci_read(host, AT91_MCI_MR) & 0x7fff;
151 sdcr = at91_mci_read(host, AT91_MCI_SDCR);
152 dtor = at91_mci_read(host, AT91_MCI_DTOR);
154 /* reset the controller */
155 at91_mci_write(host, AT91_MCI_CR, AT91_MCI_MCIDIS | AT91_MCI_SWRST);
158 at91_mci_write(host, AT91_MCI_CR, AT91_MCI_MCIEN);
159 at91_mci_write(host, AT91_MCI_MR, mr);
160 at91_mci_write(host, AT91_MCI_SDCR, sdcr);
161 at91_mci_write(host, AT91_MCI_DTOR, dtor);
162 at91_mci_write(host, AT91_MCI_IER, imr);
164 /* make sure sdio interrupts will fire */
165 at91_mci_read(host, AT91_MCI_SR);
167 local_irq_restore(flags);
170 static void at91_timeout_timer(unsigned long data)
172 struct at91mci_host *host;
174 host = (struct at91mci_host *)data;
177 dev_err(host->mmc->parent, "Timeout waiting end of packet\n");
179 if (host->cmd && host->cmd->data) {
180 host->cmd->data->error = -ETIMEDOUT;
183 host->cmd->error = -ETIMEDOUT;
185 host->request->cmd->error = -ETIMEDOUT;
188 at91_reset_host(host);
189 mmc_request_done(host->mmc, host->request);
194 * Copy from sg to a dma block - used for transfers
196 static inline void at91_mci_sg_to_dma(struct at91mci_host *host, struct mmc_data *data)
198 unsigned int len, i, size;
199 unsigned *dmabuf = host->buffer;
201 size = data->blksz * data->blocks;
204 /* AT91SAM926[0/3] Data Write Operation and number of bytes erratum */
205 if (cpu_is_at91sam9260() || cpu_is_at91sam9263())
206 if (host->total_length == 12)
207 memset(dmabuf, 0, 12);
210 * Just loop through all entries. Size might not
211 * be the entire list though so make sure that
212 * we do not transfer too much.
214 for (i = 0; i < len; i++) {
215 struct scatterlist *sg;
217 unsigned int *sgbuffer;
221 sgbuffer = kmap_atomic(sg_page(sg), KM_BIO_SRC_IRQ) + sg->offset;
222 amount = min(size, sg->length);
225 if (cpu_is_at91rm9200()) { /* AT91RM9200 errata */
228 for (index = 0; index < (amount / 4); index++)
229 *dmabuf++ = swab32(sgbuffer[index]);
231 memcpy(dmabuf, sgbuffer, amount);
235 kunmap_atomic(sgbuffer, KM_BIO_SRC_IRQ);
242 * Check that we didn't get a request to transfer
243 * more data than can fit into the SG list.
251 static void at91_mci_pre_dma_read(struct at91mci_host *host)
254 struct scatterlist *sg;
255 struct mmc_command *cmd;
256 struct mmc_data *data;
258 pr_debug("pre dma read\n");
262 pr_debug("no command\n");
268 pr_debug("no data\n");
272 for (i = 0; i < 2; i++) {
273 /* nothing left to transfer */
274 if (host->transfer_index >= data->sg_len) {
275 pr_debug("Nothing left to transfer (index = %d)\n", host->transfer_index);
279 /* Check to see if this needs filling */
281 if (at91_mci_read(host, ATMEL_PDC_RCR) != 0) {
282 pr_debug("Transfer active in current\n");
287 if (at91_mci_read(host, ATMEL_PDC_RNCR) != 0) {
288 pr_debug("Transfer active in next\n");
293 /* Setup the next transfer */
294 pr_debug("Using transfer index %d\n", host->transfer_index);
296 sg = &data->sg[host->transfer_index++];
297 pr_debug("sg = %p\n", sg);
299 sg->dma_address = dma_map_page(NULL, sg_page(sg), sg->offset, sg->length, DMA_FROM_DEVICE);
301 pr_debug("dma address = %08X, length = %d\n", sg->dma_address, sg->length);
304 at91_mci_write(host, ATMEL_PDC_RPR, sg->dma_address);
305 at91_mci_write(host, ATMEL_PDC_RCR, (data->blksz & 0x3) ? sg->length : sg->length / 4);
308 at91_mci_write(host, ATMEL_PDC_RNPR, sg->dma_address);
309 at91_mci_write(host, ATMEL_PDC_RNCR, (data->blksz & 0x3) ? sg->length : sg->length / 4);
313 pr_debug("pre dma read done\n");
317 * Handle after a dma read
319 static void at91_mci_post_dma_read(struct at91mci_host *host)
321 struct mmc_command *cmd;
322 struct mmc_data *data;
324 pr_debug("post dma read\n");
328 pr_debug("no command\n");
334 pr_debug("no data\n");
338 while (host->in_use_index < host->transfer_index) {
339 struct scatterlist *sg;
341 pr_debug("finishing index %d\n", host->in_use_index);
343 sg = &data->sg[host->in_use_index++];
345 pr_debug("Unmapping page %08X\n", sg->dma_address);
347 dma_unmap_page(NULL, sg->dma_address, sg->length, DMA_FROM_DEVICE);
349 if (cpu_is_at91rm9200()) { /* AT91RM9200 errata */
350 unsigned int *buffer;
353 /* Swap the contents of the buffer */
354 buffer = kmap_atomic(sg_page(sg), KM_BIO_SRC_IRQ) + sg->offset;
355 pr_debug("buffer = %p, length = %d\n", buffer, sg->length);
357 for (index = 0; index < (sg->length / 4); index++)
358 buffer[index] = swab32(buffer[index]);
360 kunmap_atomic(buffer, KM_BIO_SRC_IRQ);
363 flush_dcache_page(sg_page(sg));
365 data->bytes_xfered += sg->length;
368 /* Is there another transfer to trigger? */
369 if (host->transfer_index < data->sg_len)
370 at91_mci_pre_dma_read(host);
372 at91_mci_write(host, AT91_MCI_IDR, AT91_MCI_ENDRX);
373 at91_mci_write(host, AT91_MCI_IER, AT91_MCI_RXBUFF);
376 pr_debug("post dma read done\n");
380 * Handle transmitted data
382 static void at91_mci_handle_transmitted(struct at91mci_host *host)
384 struct mmc_command *cmd;
385 struct mmc_data *data;
387 pr_debug("Handling the transmit\n");
389 /* Disable the transfer */
390 at91_mci_write(host, ATMEL_PDC_PTCR, ATMEL_PDC_RXTDIS | ATMEL_PDC_TXTDIS);
392 /* Now wait for cmd ready */
393 at91_mci_write(host, AT91_MCI_IDR, AT91_MCI_TXBUFE);
401 if (cmd->data->blocks > 1) {
402 pr_debug("multiple write : wait for BLKE...\n");
403 at91_mci_write(host, AT91_MCI_IER, AT91_MCI_BLKE);
405 at91_mci_write(host, AT91_MCI_IER, AT91_MCI_NOTBUSY);
409 * Update bytes tranfered count during a write operation
411 static void at91_mci_update_bytes_xfered(struct at91mci_host *host)
413 struct mmc_data *data;
415 /* always deal with the effective request (and not the current cmd) */
417 if (host->request->cmd && host->request->cmd->error != 0)
420 if (host->request->data) {
421 data = host->request->data;
422 if (data->flags & MMC_DATA_WRITE) {
423 /* card is in IDLE mode now */
424 pr_debug("-> bytes_xfered %d, total_length = %d\n",
425 data->bytes_xfered, host->total_length);
426 data->bytes_xfered = data->blksz * data->blocks;
432 /*Handle after command sent ready*/
433 static int at91_mci_handle_cmdrdy(struct at91mci_host *host)
437 else if (!host->cmd->data) {
438 if (host->flags & FL_SENT_STOP) {
439 /*After multi block write, we must wait for NOTBUSY*/
440 at91_mci_write(host, AT91_MCI_IER, AT91_MCI_NOTBUSY);
442 } else if (host->cmd->data->flags & MMC_DATA_WRITE) {
443 /*After sendding multi-block-write command, start DMA transfer*/
444 at91_mci_write(host, AT91_MCI_IER, AT91_MCI_TXBUFE | AT91_MCI_BLKE);
445 at91_mci_write(host, ATMEL_PDC_PTCR, ATMEL_PDC_TXTEN);
448 /* command not completed, have to wait */
454 * Enable the controller
456 static void at91_mci_enable(struct at91mci_host *host)
460 at91_mci_write(host, AT91_MCI_CR, AT91_MCI_MCIEN);
461 at91_mci_write(host, AT91_MCI_IDR, 0xffffffff);
462 at91_mci_write(host, AT91_MCI_DTOR, AT91_MCI_DTOMUL_1M | AT91_MCI_DTOCYC);
463 mr = AT91_MCI_PDCMODE | 0x34a;
465 if (cpu_is_at91sam9260() || cpu_is_at91sam9263())
466 mr |= AT91_MCI_RDPROOF | AT91_MCI_WRPROOF;
468 at91_mci_write(host, AT91_MCI_MR, mr);
470 /* use Slot A or B (only one at same time) */
471 at91_mci_write(host, AT91_MCI_SDCR, host->board->slot_b);
475 * Disable the controller
477 static void at91_mci_disable(struct at91mci_host *host)
479 at91_mci_write(host, AT91_MCI_CR, AT91_MCI_MCIDIS | AT91_MCI_SWRST);
485 static void at91_mci_send_command(struct at91mci_host *host, struct mmc_command *cmd)
487 unsigned int cmdr, mr;
488 unsigned int block_length;
489 struct mmc_data *data = cmd->data;
492 unsigned int ier = 0;
496 /* Needed for leaving busy state before CMD1 */
497 if ((at91_mci_read(host, AT91_MCI_SR) & AT91_MCI_RTOE) && (cmd->opcode == 1)) {
498 pr_debug("Clearing timeout\n");
499 at91_mci_write(host, AT91_MCI_ARGR, 0);
500 at91_mci_write(host, AT91_MCI_CMDR, AT91_MCI_OPDCMD);
501 while (!(at91_mci_read(host, AT91_MCI_SR) & AT91_MCI_CMDRDY)) {
503 pr_debug("Clearing: SR = %08X\n", at91_mci_read(host, AT91_MCI_SR));
509 if (mmc_resp_type(cmd) == MMC_RSP_NONE)
510 cmdr |= AT91_MCI_RSPTYP_NONE;
512 /* if a response is expected then allow maximum response latancy */
513 cmdr |= AT91_MCI_MAXLAT;
514 /* set 136 bit response for R2, 48 bit response otherwise */
515 if (mmc_resp_type(cmd) == MMC_RSP_R2)
516 cmdr |= AT91_MCI_RSPTYP_136;
518 cmdr |= AT91_MCI_RSPTYP_48;
523 if (cpu_is_at91rm9200() || cpu_is_at91sam9261()) {
524 if (data->blksz & 0x3) {
525 pr_debug("Unsupported block size\n");
526 cmd->error = -EINVAL;
527 mmc_request_done(host->mmc, host->request);
530 if (data->flags & MMC_DATA_STREAM) {
531 pr_debug("Stream commands not supported\n");
532 cmd->error = -EINVAL;
533 mmc_request_done(host->mmc, host->request);
538 block_length = data->blksz;
539 blocks = data->blocks;
541 /* always set data start - also set direction flag for read */
542 if (data->flags & MMC_DATA_READ)
543 cmdr |= (AT91_MCI_TRDIR | AT91_MCI_TRCMD_START);
544 else if (data->flags & MMC_DATA_WRITE)
545 cmdr |= AT91_MCI_TRCMD_START;
547 if (data->flags & MMC_DATA_STREAM)
548 cmdr |= AT91_MCI_TRTYP_STREAM;
549 if (data->blocks > 1)
550 cmdr |= AT91_MCI_TRTYP_MULTIPLE;
557 if (host->flags & FL_SENT_STOP)
558 cmdr |= AT91_MCI_TRCMD_STOP;
560 if (host->bus_mode == MMC_BUSMODE_OPENDRAIN)
561 cmdr |= AT91_MCI_OPDCMD;
564 * Set the arguments and send the command
566 pr_debug("Sending command %d as %08X, arg = %08X, blocks = %d, length = %d (MR = %08X)\n",
567 cmd->opcode, cmdr, cmd->arg, blocks, block_length, at91_mci_read(host, AT91_MCI_MR));
570 at91_mci_write(host, ATMEL_PDC_PTCR, ATMEL_PDC_TXTDIS | ATMEL_PDC_RXTDIS);
571 at91_mci_write(host, ATMEL_PDC_RPR, 0);
572 at91_mci_write(host, ATMEL_PDC_RCR, 0);
573 at91_mci_write(host, ATMEL_PDC_RNPR, 0);
574 at91_mci_write(host, ATMEL_PDC_RNCR, 0);
575 at91_mci_write(host, ATMEL_PDC_TPR, 0);
576 at91_mci_write(host, ATMEL_PDC_TCR, 0);
577 at91_mci_write(host, ATMEL_PDC_TNPR, 0);
578 at91_mci_write(host, ATMEL_PDC_TNCR, 0);
579 ier = AT91_MCI_CMDRDY;
581 /* zero block length and PDC mode */
582 mr = at91_mci_read(host, AT91_MCI_MR) & 0x5fff;
583 mr |= (data->blksz & 0x3) ? AT91_MCI_PDCFBYTE : 0;
584 mr |= (block_length << 16);
585 mr |= AT91_MCI_PDCMODE;
586 at91_mci_write(host, AT91_MCI_MR, mr);
588 if (!(cpu_is_at91rm9200() || cpu_is_at91sam9261()))
589 at91_mci_write(host, AT91_MCI_BLKR,
590 AT91_MCI_BLKR_BCNT(blocks) |
591 AT91_MCI_BLKR_BLKLEN(block_length));
594 * Disable the PDC controller
596 at91_mci_write(host, ATMEL_PDC_PTCR, ATMEL_PDC_RXTDIS | ATMEL_PDC_TXTDIS);
598 if (cmdr & AT91_MCI_TRCMD_START) {
599 data->bytes_xfered = 0;
600 host->transfer_index = 0;
601 host->in_use_index = 0;
602 if (cmdr & AT91_MCI_TRDIR) {
607 host->total_length = 0;
609 at91_mci_pre_dma_read(host);
610 ier = AT91_MCI_ENDRX /* | AT91_MCI_RXBUFF */;
616 host->total_length = block_length * blocks;
618 * AT91SAM926[0/3] Data Write Operation and
619 * number of bytes erratum
621 if (cpu_is_at91sam9260 () || cpu_is_at91sam9263())
622 if (host->total_length < 12)
623 host->total_length = 12;
624 host->buffer = dma_alloc_coherent(NULL,
626 &host->physical_address, GFP_KERNEL);
628 at91_mci_sg_to_dma(host, data);
630 pr_debug("Transmitting %d bytes\n", host->total_length);
632 at91_mci_write(host, ATMEL_PDC_TPR, host->physical_address);
633 at91_mci_write(host, ATMEL_PDC_TCR, (data->blksz & 0x3) ?
634 host->total_length : host->total_length / 4);
636 ier = AT91_MCI_CMDRDY;
642 * Send the command and then enable the PDC - not the other way round as
643 * the data sheet says
646 at91_mci_write(host, AT91_MCI_ARGR, cmd->arg);
647 at91_mci_write(host, AT91_MCI_CMDR, cmdr);
649 if (cmdr & AT91_MCI_TRCMD_START) {
650 if (cmdr & AT91_MCI_TRDIR)
651 at91_mci_write(host, ATMEL_PDC_PTCR, ATMEL_PDC_RXTEN);
654 /* Enable selected interrupts */
655 at91_mci_write(host, AT91_MCI_IER, AT91_MCI_ERRORS | ier);
659 * Process the next step in the request
661 static void at91_mci_process_next(struct at91mci_host *host)
663 if (!(host->flags & FL_SENT_COMMAND)) {
664 host->flags |= FL_SENT_COMMAND;
665 at91_mci_send_command(host, host->request->cmd);
667 else if ((!(host->flags & FL_SENT_STOP)) && host->request->stop) {
668 host->flags |= FL_SENT_STOP;
669 at91_mci_send_command(host, host->request->stop);
671 del_timer(&host->timer);
672 /* the at91rm9200 mci controller hangs after some transfers,
673 * and the workaround is to reset it after each transfer.
675 if (cpu_is_at91rm9200())
676 at91_reset_host(host);
677 mmc_request_done(host->mmc, host->request);
682 * Handle a command that has been completed
684 static void at91_mci_completed_command(struct at91mci_host *host, unsigned int status)
686 struct mmc_command *cmd = host->cmd;
687 struct mmc_data *data = cmd->data;
689 at91_mci_write(host, AT91_MCI_IDR, 0xffffffff & ~(AT91_MCI_SDIOIRQA | AT91_MCI_SDIOIRQB));
691 cmd->resp[0] = at91_mci_read(host, AT91_MCI_RSPR(0));
692 cmd->resp[1] = at91_mci_read(host, AT91_MCI_RSPR(1));
693 cmd->resp[2] = at91_mci_read(host, AT91_MCI_RSPR(2));
694 cmd->resp[3] = at91_mci_read(host, AT91_MCI_RSPR(3));
697 dma_free_coherent(NULL, host->total_length, host->buffer, host->physical_address);
701 pr_debug("Status = %08X/%08x [%08X %08X %08X %08X]\n",
702 status, at91_mci_read(host, AT91_MCI_SR),
703 cmd->resp[0], cmd->resp[1], cmd->resp[2], cmd->resp[3]);
705 if (status & AT91_MCI_ERRORS) {
706 if ((status & AT91_MCI_RCRCE) && !(mmc_resp_type(cmd) & MMC_RSP_CRC)) {
710 if (status & (AT91_MCI_DTOE | AT91_MCI_DCRCE)) {
712 if (status & AT91_MCI_DTOE)
713 data->error = -ETIMEDOUT;
714 else if (status & AT91_MCI_DCRCE)
715 data->error = -EILSEQ;
718 if (status & AT91_MCI_RTOE)
719 cmd->error = -ETIMEDOUT;
720 else if (status & AT91_MCI_RCRCE)
721 cmd->error = -EILSEQ;
726 pr_debug("Error detected and set to %d/%d (cmd = %d, retries = %d)\n",
727 cmd->error, data ? data->error : 0,
728 cmd->opcode, cmd->retries);
734 at91_mci_process_next(host);
738 * Handle an MMC request
740 static void at91_mci_request(struct mmc_host *mmc, struct mmc_request *mrq)
742 struct at91mci_host *host = mmc_priv(mmc);
746 mod_timer(&host->timer, jiffies + HZ);
748 at91_mci_process_next(host);
754 static void at91_mci_set_ios(struct mmc_host *mmc, struct mmc_ios *ios)
757 struct at91mci_host *host = mmc_priv(mmc);
758 unsigned long at91_master_clock = clk_get_rate(host->mci_clk);
760 host->bus_mode = ios->bus_mode;
762 if (ios->clock == 0) {
763 /* Disable the MCI controller */
764 at91_mci_write(host, AT91_MCI_CR, AT91_MCI_MCIDIS);
768 /* Enable the MCI controller */
769 at91_mci_write(host, AT91_MCI_CR, AT91_MCI_MCIEN);
771 if ((at91_master_clock % (ios->clock * 2)) == 0)
772 clkdiv = ((at91_master_clock / ios->clock) / 2) - 1;
774 clkdiv = (at91_master_clock / ios->clock) / 2;
776 pr_debug("clkdiv = %d. mcck = %ld\n", clkdiv,
777 at91_master_clock / (2 * (clkdiv + 1)));
779 if (ios->bus_width == MMC_BUS_WIDTH_4 && host->board->wire4) {
780 pr_debug("MMC: Setting controller bus width to 4\n");
781 at91_mci_write(host, AT91_MCI_SDCR, at91_mci_read(host, AT91_MCI_SDCR) | AT91_MCI_SDCBUS);
784 pr_debug("MMC: Setting controller bus width to 1\n");
785 at91_mci_write(host, AT91_MCI_SDCR, at91_mci_read(host, AT91_MCI_SDCR) & ~AT91_MCI_SDCBUS);
788 /* Set the clock divider */
789 at91_mci_write(host, AT91_MCI_MR, (at91_mci_read(host, AT91_MCI_MR) & ~AT91_MCI_CLKDIV) | clkdiv);
791 /* maybe switch power to the card */
792 if (host->board->vcc_pin) {
793 switch (ios->power_mode) {
795 gpio_set_value(host->board->vcc_pin, 0);
798 gpio_set_value(host->board->vcc_pin, 1);
809 * Handle an interrupt
811 static irqreturn_t at91_mci_irq(int irq, void *devid)
813 struct at91mci_host *host = devid;
815 unsigned int int_status, int_mask;
817 int_status = at91_mci_read(host, AT91_MCI_SR);
818 int_mask = at91_mci_read(host, AT91_MCI_IMR);
820 pr_debug("MCI irq: status = %08X, %08X, %08X\n", int_status, int_mask,
821 int_status & int_mask);
823 int_status = int_status & int_mask;
825 if (int_status & AT91_MCI_ERRORS) {
828 if (int_status & AT91_MCI_UNRE)
829 pr_debug("MMC: Underrun error\n");
830 if (int_status & AT91_MCI_OVRE)
831 pr_debug("MMC: Overrun error\n");
832 if (int_status & AT91_MCI_DTOE)
833 pr_debug("MMC: Data timeout\n");
834 if (int_status & AT91_MCI_DCRCE)
835 pr_debug("MMC: CRC error in data\n");
836 if (int_status & AT91_MCI_RTOE)
837 pr_debug("MMC: Response timeout\n");
838 if (int_status & AT91_MCI_RENDE)
839 pr_debug("MMC: Response end bit error\n");
840 if (int_status & AT91_MCI_RCRCE)
841 pr_debug("MMC: Response CRC error\n");
842 if (int_status & AT91_MCI_RDIRE)
843 pr_debug("MMC: Response direction error\n");
844 if (int_status & AT91_MCI_RINDE)
845 pr_debug("MMC: Response index error\n");
847 /* Only continue processing if no errors */
849 if (int_status & AT91_MCI_TXBUFE) {
850 pr_debug("TX buffer empty\n");
851 at91_mci_handle_transmitted(host);
854 if (int_status & AT91_MCI_ENDRX) {
856 at91_mci_post_dma_read(host);
859 if (int_status & AT91_MCI_RXBUFF) {
860 pr_debug("RX buffer full\n");
861 at91_mci_write(host, ATMEL_PDC_PTCR, ATMEL_PDC_RXTDIS | ATMEL_PDC_TXTDIS);
862 at91_mci_write(host, AT91_MCI_IDR, AT91_MCI_RXBUFF | AT91_MCI_ENDRX);
866 if (int_status & AT91_MCI_ENDTX)
867 pr_debug("Transmit has ended\n");
869 if (int_status & AT91_MCI_NOTBUSY) {
870 pr_debug("Card is ready\n");
871 at91_mci_update_bytes_xfered(host);
875 if (int_status & AT91_MCI_DTIP)
876 pr_debug("Data transfer in progress\n");
878 if (int_status & AT91_MCI_BLKE) {
879 pr_debug("Block transfer has ended\n");
880 if (host->request->data && host->request->data->blocks > 1) {
881 /* multi block write : complete multi write
882 * command and send stop */
885 at91_mci_write(host, AT91_MCI_IER, AT91_MCI_NOTBUSY);
889 if (int_status & AT91_MCI_SDIOIRQA)
890 mmc_signal_sdio_irq(host->mmc);
892 if (int_status & AT91_MCI_SDIOIRQB)
893 mmc_signal_sdio_irq(host->mmc);
895 if (int_status & AT91_MCI_TXRDY)
896 pr_debug("Ready to transmit\n");
898 if (int_status & AT91_MCI_RXRDY)
899 pr_debug("Ready to receive\n");
901 if (int_status & AT91_MCI_CMDRDY) {
902 pr_debug("Command ready\n");
903 completed = at91_mci_handle_cmdrdy(host);
908 pr_debug("Completed command\n");
909 at91_mci_write(host, AT91_MCI_IDR, 0xffffffff & ~(AT91_MCI_SDIOIRQA | AT91_MCI_SDIOIRQB));
910 at91_mci_completed_command(host, int_status);
912 at91_mci_write(host, AT91_MCI_IDR, int_status & ~(AT91_MCI_SDIOIRQA | AT91_MCI_SDIOIRQB));
917 static irqreturn_t at91_mmc_det_irq(int irq, void *_host)
919 struct at91mci_host *host = _host;
920 int present = !gpio_get_value(irq_to_gpio(irq));
923 * we expect this irq on both insert and remove,
924 * and use a short delay to debounce.
926 if (present != host->present) {
927 host->present = present;
928 pr_debug("%s: card %s\n", mmc_hostname(host->mmc),
929 present ? "insert" : "remove");
931 pr_debug("****** Resetting SD-card bus width ******\n");
932 at91_mci_write(host, AT91_MCI_SDCR, at91_mci_read(host, AT91_MCI_SDCR) & ~AT91_MCI_SDCBUS);
934 mmc_detect_change(host->mmc, msecs_to_jiffies(100));
939 static int at91_mci_get_ro(struct mmc_host *mmc)
941 struct at91mci_host *host = mmc_priv(mmc);
943 if (host->board->wp_pin)
944 return !!gpio_get_value(host->board->wp_pin);
946 * Board doesn't support read only detection; let the mmc core
952 static void at91_mci_enable_sdio_irq(struct mmc_host *mmc, int enable)
954 struct at91mci_host *host = mmc_priv(mmc);
956 pr_debug("%s: sdio_irq %c : %s\n", mmc_hostname(host->mmc),
957 host->board->slot_b ? 'B':'A', enable ? "enable" : "disable");
958 at91_mci_write(host, enable ? AT91_MCI_IER : AT91_MCI_IDR,
959 host->board->slot_b ? AT91_MCI_SDIOIRQB : AT91_MCI_SDIOIRQA);
963 static const struct mmc_host_ops at91_mci_ops = {
964 .request = at91_mci_request,
965 .set_ios = at91_mci_set_ios,
966 .get_ro = at91_mci_get_ro,
967 .enable_sdio_irq = at91_mci_enable_sdio_irq,
971 * Probe for the device
973 static int __init at91_mci_probe(struct platform_device *pdev)
975 struct mmc_host *mmc;
976 struct at91mci_host *host;
977 struct resource *res;
980 res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
984 if (!request_mem_region(res->start, res->end - res->start + 1, DRIVER_NAME))
987 mmc = mmc_alloc_host(sizeof(struct at91mci_host), &pdev->dev);
990 dev_dbg(&pdev->dev, "couldn't allocate mmc host\n");
994 mmc->ops = &at91_mci_ops;
996 mmc->f_max = 25000000;
997 mmc->ocr_avail = MMC_VDD_32_33 | MMC_VDD_33_34;
998 mmc->caps = MMC_CAP_SDIO_IRQ;
1000 mmc->max_blk_size = 4095;
1001 mmc->max_blk_count = mmc->max_req_size;
1003 host = mmc_priv(mmc);
1005 host->buffer = NULL;
1007 host->board = pdev->dev.platform_data;
1008 if (host->board->wire4) {
1009 if (cpu_is_at91sam9260() || cpu_is_at91sam9263())
1010 mmc->caps |= MMC_CAP_4_BIT_DATA;
1012 dev_warn(&pdev->dev, "4 wire bus mode not supported"
1013 " - using 1 wire\n");
1017 * Reserve GPIOs ... board init code makes sure these pins are set
1018 * up as GPIOs with the right direction (input, except for vcc)
1020 if (host->board->det_pin) {
1021 ret = gpio_request(host->board->det_pin, "mmc_detect");
1023 dev_dbg(&pdev->dev, "couldn't claim card detect pin\n");
1027 if (host->board->wp_pin) {
1028 ret = gpio_request(host->board->wp_pin, "mmc_wp");
1030 dev_dbg(&pdev->dev, "couldn't claim wp sense pin\n");
1034 if (host->board->vcc_pin) {
1035 ret = gpio_request(host->board->vcc_pin, "mmc_vcc");
1037 dev_dbg(&pdev->dev, "couldn't claim vcc switch pin\n");
1045 host->mci_clk = clk_get(&pdev->dev, "mci_clk");
1046 if (IS_ERR(host->mci_clk)) {
1048 dev_dbg(&pdev->dev, "no mci_clk?\n");
1055 host->baseaddr = ioremap(res->start, res->end - res->start + 1);
1056 if (!host->baseaddr) {
1064 clk_enable(host->mci_clk); /* Enable the peripheral clock */
1065 at91_mci_disable(host);
1066 at91_mci_enable(host);
1069 * Allocate the MCI interrupt
1071 host->irq = platform_get_irq(pdev, 0);
1072 ret = request_irq(host->irq, at91_mci_irq, IRQF_SHARED,
1073 mmc_hostname(mmc), host);
1075 dev_dbg(&pdev->dev, "request MCI interrupt failed\n");
1079 platform_set_drvdata(pdev, mmc);
1082 * Add host to MMC layer
1084 if (host->board->det_pin) {
1085 host->present = !gpio_get_value(host->board->det_pin);
1092 setup_timer(&host->timer, at91_timeout_timer, (unsigned long)host);
1095 * monitor card insertion/removal if we can
1097 if (host->board->det_pin) {
1098 ret = request_irq(gpio_to_irq(host->board->det_pin),
1099 at91_mmc_det_irq, 0, mmc_hostname(mmc), host);
1101 dev_warn(&pdev->dev, "request MMC detect irq failed\n");
1103 device_init_wakeup(&pdev->dev, 1);
1106 pr_debug("Added MCI driver\n");
1111 clk_disable(host->mci_clk);
1112 iounmap(host->baseaddr);
1114 clk_put(host->mci_clk);
1116 if (host->board->vcc_pin)
1117 gpio_free(host->board->vcc_pin);
1119 if (host->board->wp_pin)
1120 gpio_free(host->board->wp_pin);
1122 if (host->board->det_pin)
1123 gpio_free(host->board->det_pin);
1127 release_mem_region(res->start, res->end - res->start + 1);
1128 dev_err(&pdev->dev, "probe failed, err %d\n", ret);
1135 static int __exit at91_mci_remove(struct platform_device *pdev)
1137 struct mmc_host *mmc = platform_get_drvdata(pdev);
1138 struct at91mci_host *host;
1139 struct resource *res;
1144 host = mmc_priv(mmc);
1146 if (host->board->det_pin) {
1147 if (device_can_wakeup(&pdev->dev))
1148 free_irq(gpio_to_irq(host->board->det_pin), host);
1149 device_init_wakeup(&pdev->dev, 0);
1150 gpio_free(host->board->det_pin);
1153 at91_mci_disable(host);
1154 del_timer_sync(&host->timer);
1155 mmc_remove_host(mmc);
1156 free_irq(host->irq, host);
1158 clk_disable(host->mci_clk); /* Disable the peripheral clock */
1159 clk_put(host->mci_clk);
1161 if (host->board->vcc_pin)
1162 gpio_free(host->board->vcc_pin);
1163 if (host->board->wp_pin)
1164 gpio_free(host->board->wp_pin);
1166 iounmap(host->baseaddr);
1167 res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
1168 release_mem_region(res->start, res->end - res->start + 1);
1171 platform_set_drvdata(pdev, NULL);
1172 pr_debug("MCI Removed\n");
1178 static int at91_mci_suspend(struct platform_device *pdev, pm_message_t state)
1180 struct mmc_host *mmc = platform_get_drvdata(pdev);
1181 struct at91mci_host *host = mmc_priv(mmc);
1184 if (host->board->det_pin && device_may_wakeup(&pdev->dev))
1185 enable_irq_wake(host->board->det_pin);
1188 ret = mmc_suspend_host(mmc, state);
1193 static int at91_mci_resume(struct platform_device *pdev)
1195 struct mmc_host *mmc = platform_get_drvdata(pdev);
1196 struct at91mci_host *host = mmc_priv(mmc);
1199 if (host->board->det_pin && device_may_wakeup(&pdev->dev))
1200 disable_irq_wake(host->board->det_pin);
1203 ret = mmc_resume_host(mmc);
1208 #define at91_mci_suspend NULL
1209 #define at91_mci_resume NULL
1212 static struct platform_driver at91_mci_driver = {
1213 .remove = __exit_p(at91_mci_remove),
1214 .suspend = at91_mci_suspend,
1215 .resume = at91_mci_resume,
1217 .name = DRIVER_NAME,
1218 .owner = THIS_MODULE,
1222 static int __init at91_mci_init(void)
1224 return platform_driver_probe(&at91_mci_driver, at91_mci_probe);
1227 static void __exit at91_mci_exit(void)
1229 platform_driver_unregister(&at91_mci_driver);
1232 module_init(at91_mci_init);
1233 module_exit(at91_mci_exit);
1235 MODULE_DESCRIPTION("AT91 Multimedia Card Interface driver");
1236 MODULE_AUTHOR("Nick Randell");
1237 MODULE_LICENSE("GPL");
1238 MODULE_ALIAS("platform:at91_mci");