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;
625 host->buffer = kmalloc(host->total_length, GFP_KERNEL);
627 pr_debug("Can't alloc tx buffer\n");
628 cmd->error = -ENOMEM;
629 mmc_request_done(host->mmc, host->request);
633 at91_mci_sg_to_dma(host, data);
635 host->physical_address = dma_map_single(NULL,
636 host->buffer, host->total_length,
639 pr_debug("Transmitting %d bytes\n", host->total_length);
641 at91_mci_write(host, ATMEL_PDC_TPR, host->physical_address);
642 at91_mci_write(host, ATMEL_PDC_TCR, (data->blksz & 0x3) ?
643 host->total_length : host->total_length / 4);
645 ier = AT91_MCI_CMDRDY;
651 * Send the command and then enable the PDC - not the other way round as
652 * the data sheet says
655 at91_mci_write(host, AT91_MCI_ARGR, cmd->arg);
656 at91_mci_write(host, AT91_MCI_CMDR, cmdr);
658 if (cmdr & AT91_MCI_TRCMD_START) {
659 if (cmdr & AT91_MCI_TRDIR)
660 at91_mci_write(host, ATMEL_PDC_PTCR, ATMEL_PDC_RXTEN);
663 /* Enable selected interrupts */
664 at91_mci_write(host, AT91_MCI_IER, AT91_MCI_ERRORS | ier);
668 * Process the next step in the request
670 static void at91_mci_process_next(struct at91mci_host *host)
672 if (!(host->flags & FL_SENT_COMMAND)) {
673 host->flags |= FL_SENT_COMMAND;
674 at91_mci_send_command(host, host->request->cmd);
676 else if ((!(host->flags & FL_SENT_STOP)) && host->request->stop) {
677 host->flags |= FL_SENT_STOP;
678 at91_mci_send_command(host, host->request->stop);
680 del_timer(&host->timer);
681 /* the at91rm9200 mci controller hangs after some transfers,
682 * and the workaround is to reset it after each transfer.
684 if (cpu_is_at91rm9200())
685 at91_reset_host(host);
686 mmc_request_done(host->mmc, host->request);
691 * Handle a command that has been completed
693 static void at91_mci_completed_command(struct at91mci_host *host, unsigned int status)
695 struct mmc_command *cmd = host->cmd;
696 struct mmc_data *data = cmd->data;
698 at91_mci_write(host, AT91_MCI_IDR, 0xffffffff & ~(AT91_MCI_SDIOIRQA | AT91_MCI_SDIOIRQB));
700 cmd->resp[0] = at91_mci_read(host, AT91_MCI_RSPR(0));
701 cmd->resp[1] = at91_mci_read(host, AT91_MCI_RSPR(1));
702 cmd->resp[2] = at91_mci_read(host, AT91_MCI_RSPR(2));
703 cmd->resp[3] = at91_mci_read(host, AT91_MCI_RSPR(3));
706 dma_unmap_single(NULL,
707 host->physical_address, host->total_length,
713 pr_debug("Status = %08X/%08x [%08X %08X %08X %08X]\n",
714 status, at91_mci_read(host, AT91_MCI_SR),
715 cmd->resp[0], cmd->resp[1], cmd->resp[2], cmd->resp[3]);
717 if (status & AT91_MCI_ERRORS) {
718 if ((status & AT91_MCI_RCRCE) && !(mmc_resp_type(cmd) & MMC_RSP_CRC)) {
722 if (status & (AT91_MCI_DTOE | AT91_MCI_DCRCE)) {
724 if (status & AT91_MCI_DTOE)
725 data->error = -ETIMEDOUT;
726 else if (status & AT91_MCI_DCRCE)
727 data->error = -EILSEQ;
730 if (status & AT91_MCI_RTOE)
731 cmd->error = -ETIMEDOUT;
732 else if (status & AT91_MCI_RCRCE)
733 cmd->error = -EILSEQ;
738 pr_debug("Error detected and set to %d/%d (cmd = %d, retries = %d)\n",
739 cmd->error, data ? data->error : 0,
740 cmd->opcode, cmd->retries);
746 at91_mci_process_next(host);
750 * Handle an MMC request
752 static void at91_mci_request(struct mmc_host *mmc, struct mmc_request *mrq)
754 struct at91mci_host *host = mmc_priv(mmc);
758 mod_timer(&host->timer, jiffies + HZ);
760 at91_mci_process_next(host);
766 static void at91_mci_set_ios(struct mmc_host *mmc, struct mmc_ios *ios)
769 struct at91mci_host *host = mmc_priv(mmc);
770 unsigned long at91_master_clock = clk_get_rate(host->mci_clk);
772 host->bus_mode = ios->bus_mode;
774 if (ios->clock == 0) {
775 /* Disable the MCI controller */
776 at91_mci_write(host, AT91_MCI_CR, AT91_MCI_MCIDIS);
780 /* Enable the MCI controller */
781 at91_mci_write(host, AT91_MCI_CR, AT91_MCI_MCIEN);
783 if ((at91_master_clock % (ios->clock * 2)) == 0)
784 clkdiv = ((at91_master_clock / ios->clock) / 2) - 1;
786 clkdiv = (at91_master_clock / ios->clock) / 2;
788 pr_debug("clkdiv = %d. mcck = %ld\n", clkdiv,
789 at91_master_clock / (2 * (clkdiv + 1)));
791 if (ios->bus_width == MMC_BUS_WIDTH_4 && host->board->wire4) {
792 pr_debug("MMC: Setting controller bus width to 4\n");
793 at91_mci_write(host, AT91_MCI_SDCR, at91_mci_read(host, AT91_MCI_SDCR) | AT91_MCI_SDCBUS);
796 pr_debug("MMC: Setting controller bus width to 1\n");
797 at91_mci_write(host, AT91_MCI_SDCR, at91_mci_read(host, AT91_MCI_SDCR) & ~AT91_MCI_SDCBUS);
800 /* Set the clock divider */
801 at91_mci_write(host, AT91_MCI_MR, (at91_mci_read(host, AT91_MCI_MR) & ~AT91_MCI_CLKDIV) | clkdiv);
803 /* maybe switch power to the card */
804 if (host->board->vcc_pin) {
805 switch (ios->power_mode) {
807 gpio_set_value(host->board->vcc_pin, 0);
810 gpio_set_value(host->board->vcc_pin, 1);
821 * Handle an interrupt
823 static irqreturn_t at91_mci_irq(int irq, void *devid)
825 struct at91mci_host *host = devid;
827 unsigned int int_status, int_mask;
829 int_status = at91_mci_read(host, AT91_MCI_SR);
830 int_mask = at91_mci_read(host, AT91_MCI_IMR);
832 pr_debug("MCI irq: status = %08X, %08X, %08X\n", int_status, int_mask,
833 int_status & int_mask);
835 int_status = int_status & int_mask;
837 if (int_status & AT91_MCI_ERRORS) {
840 if (int_status & AT91_MCI_UNRE)
841 pr_debug("MMC: Underrun error\n");
842 if (int_status & AT91_MCI_OVRE)
843 pr_debug("MMC: Overrun error\n");
844 if (int_status & AT91_MCI_DTOE)
845 pr_debug("MMC: Data timeout\n");
846 if (int_status & AT91_MCI_DCRCE)
847 pr_debug("MMC: CRC error in data\n");
848 if (int_status & AT91_MCI_RTOE)
849 pr_debug("MMC: Response timeout\n");
850 if (int_status & AT91_MCI_RENDE)
851 pr_debug("MMC: Response end bit error\n");
852 if (int_status & AT91_MCI_RCRCE)
853 pr_debug("MMC: Response CRC error\n");
854 if (int_status & AT91_MCI_RDIRE)
855 pr_debug("MMC: Response direction error\n");
856 if (int_status & AT91_MCI_RINDE)
857 pr_debug("MMC: Response index error\n");
859 /* Only continue processing if no errors */
861 if (int_status & AT91_MCI_TXBUFE) {
862 pr_debug("TX buffer empty\n");
863 at91_mci_handle_transmitted(host);
866 if (int_status & AT91_MCI_ENDRX) {
868 at91_mci_post_dma_read(host);
871 if (int_status & AT91_MCI_RXBUFF) {
872 pr_debug("RX buffer full\n");
873 at91_mci_write(host, ATMEL_PDC_PTCR, ATMEL_PDC_RXTDIS | ATMEL_PDC_TXTDIS);
874 at91_mci_write(host, AT91_MCI_IDR, AT91_MCI_RXBUFF | AT91_MCI_ENDRX);
878 if (int_status & AT91_MCI_ENDTX)
879 pr_debug("Transmit has ended\n");
881 if (int_status & AT91_MCI_NOTBUSY) {
882 pr_debug("Card is ready\n");
883 at91_mci_update_bytes_xfered(host);
887 if (int_status & AT91_MCI_DTIP)
888 pr_debug("Data transfer in progress\n");
890 if (int_status & AT91_MCI_BLKE) {
891 pr_debug("Block transfer has ended\n");
892 if (host->request->data && host->request->data->blocks > 1) {
893 /* multi block write : complete multi write
894 * command and send stop */
897 at91_mci_write(host, AT91_MCI_IER, AT91_MCI_NOTBUSY);
901 if (int_status & AT91_MCI_SDIOIRQA)
902 mmc_signal_sdio_irq(host->mmc);
904 if (int_status & AT91_MCI_SDIOIRQB)
905 mmc_signal_sdio_irq(host->mmc);
907 if (int_status & AT91_MCI_TXRDY)
908 pr_debug("Ready to transmit\n");
910 if (int_status & AT91_MCI_RXRDY)
911 pr_debug("Ready to receive\n");
913 if (int_status & AT91_MCI_CMDRDY) {
914 pr_debug("Command ready\n");
915 completed = at91_mci_handle_cmdrdy(host);
920 pr_debug("Completed command\n");
921 at91_mci_write(host, AT91_MCI_IDR, 0xffffffff & ~(AT91_MCI_SDIOIRQA | AT91_MCI_SDIOIRQB));
922 at91_mci_completed_command(host, int_status);
924 at91_mci_write(host, AT91_MCI_IDR, int_status & ~(AT91_MCI_SDIOIRQA | AT91_MCI_SDIOIRQB));
929 static irqreturn_t at91_mmc_det_irq(int irq, void *_host)
931 struct at91mci_host *host = _host;
932 int present = !gpio_get_value(irq_to_gpio(irq));
935 * we expect this irq on both insert and remove,
936 * and use a short delay to debounce.
938 if (present != host->present) {
939 host->present = present;
940 pr_debug("%s: card %s\n", mmc_hostname(host->mmc),
941 present ? "insert" : "remove");
943 pr_debug("****** Resetting SD-card bus width ******\n");
944 at91_mci_write(host, AT91_MCI_SDCR, at91_mci_read(host, AT91_MCI_SDCR) & ~AT91_MCI_SDCBUS);
946 mmc_detect_change(host->mmc, msecs_to_jiffies(100));
951 static int at91_mci_get_ro(struct mmc_host *mmc)
953 struct at91mci_host *host = mmc_priv(mmc);
955 if (host->board->wp_pin)
956 return !!gpio_get_value(host->board->wp_pin);
958 * Board doesn't support read only detection; let the mmc core
964 static void at91_mci_enable_sdio_irq(struct mmc_host *mmc, int enable)
966 struct at91mci_host *host = mmc_priv(mmc);
968 pr_debug("%s: sdio_irq %c : %s\n", mmc_hostname(host->mmc),
969 host->board->slot_b ? 'B':'A', enable ? "enable" : "disable");
970 at91_mci_write(host, enable ? AT91_MCI_IER : AT91_MCI_IDR,
971 host->board->slot_b ? AT91_MCI_SDIOIRQB : AT91_MCI_SDIOIRQA);
975 static const struct mmc_host_ops at91_mci_ops = {
976 .request = at91_mci_request,
977 .set_ios = at91_mci_set_ios,
978 .get_ro = at91_mci_get_ro,
979 .enable_sdio_irq = at91_mci_enable_sdio_irq,
983 * Probe for the device
985 static int __init at91_mci_probe(struct platform_device *pdev)
987 struct mmc_host *mmc;
988 struct at91mci_host *host;
989 struct resource *res;
992 res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
996 if (!request_mem_region(res->start, res->end - res->start + 1, DRIVER_NAME))
999 mmc = mmc_alloc_host(sizeof(struct at91mci_host), &pdev->dev);
1002 dev_dbg(&pdev->dev, "couldn't allocate mmc host\n");
1006 mmc->ops = &at91_mci_ops;
1007 mmc->f_min = 375000;
1008 mmc->f_max = 25000000;
1009 mmc->ocr_avail = MMC_VDD_32_33 | MMC_VDD_33_34;
1010 mmc->caps = MMC_CAP_SDIO_IRQ;
1012 mmc->max_blk_size = 4095;
1013 mmc->max_blk_count = mmc->max_req_size;
1015 host = mmc_priv(mmc);
1017 host->buffer = NULL;
1019 host->board = pdev->dev.platform_data;
1020 if (host->board->wire4) {
1021 if (cpu_is_at91sam9260() || cpu_is_at91sam9263())
1022 mmc->caps |= MMC_CAP_4_BIT_DATA;
1024 dev_warn(&pdev->dev, "4 wire bus mode not supported"
1025 " - using 1 wire\n");
1029 * Reserve GPIOs ... board init code makes sure these pins are set
1030 * up as GPIOs with the right direction (input, except for vcc)
1032 if (host->board->det_pin) {
1033 ret = gpio_request(host->board->det_pin, "mmc_detect");
1035 dev_dbg(&pdev->dev, "couldn't claim card detect pin\n");
1039 if (host->board->wp_pin) {
1040 ret = gpio_request(host->board->wp_pin, "mmc_wp");
1042 dev_dbg(&pdev->dev, "couldn't claim wp sense pin\n");
1046 if (host->board->vcc_pin) {
1047 ret = gpio_request(host->board->vcc_pin, "mmc_vcc");
1049 dev_dbg(&pdev->dev, "couldn't claim vcc switch pin\n");
1057 host->mci_clk = clk_get(&pdev->dev, "mci_clk");
1058 if (IS_ERR(host->mci_clk)) {
1060 dev_dbg(&pdev->dev, "no mci_clk?\n");
1067 host->baseaddr = ioremap(res->start, res->end - res->start + 1);
1068 if (!host->baseaddr) {
1076 clk_enable(host->mci_clk); /* Enable the peripheral clock */
1077 at91_mci_disable(host);
1078 at91_mci_enable(host);
1081 * Allocate the MCI interrupt
1083 host->irq = platform_get_irq(pdev, 0);
1084 ret = request_irq(host->irq, at91_mci_irq, IRQF_SHARED,
1085 mmc_hostname(mmc), host);
1087 dev_dbg(&pdev->dev, "request MCI interrupt failed\n");
1091 setup_timer(&host->timer, at91_timeout_timer, (unsigned long)host);
1093 platform_set_drvdata(pdev, mmc);
1096 * Add host to MMC layer
1098 if (host->board->det_pin) {
1099 host->present = !gpio_get_value(host->board->det_pin);
1107 * monitor card insertion/removal if we can
1109 if (host->board->det_pin) {
1110 ret = request_irq(gpio_to_irq(host->board->det_pin),
1111 at91_mmc_det_irq, 0, mmc_hostname(mmc), host);
1113 dev_warn(&pdev->dev, "request MMC detect irq failed\n");
1115 device_init_wakeup(&pdev->dev, 1);
1118 pr_debug("Added MCI driver\n");
1123 clk_disable(host->mci_clk);
1124 iounmap(host->baseaddr);
1126 clk_put(host->mci_clk);
1128 if (host->board->vcc_pin)
1129 gpio_free(host->board->vcc_pin);
1131 if (host->board->wp_pin)
1132 gpio_free(host->board->wp_pin);
1134 if (host->board->det_pin)
1135 gpio_free(host->board->det_pin);
1139 release_mem_region(res->start, res->end - res->start + 1);
1140 dev_err(&pdev->dev, "probe failed, err %d\n", ret);
1147 static int __exit at91_mci_remove(struct platform_device *pdev)
1149 struct mmc_host *mmc = platform_get_drvdata(pdev);
1150 struct at91mci_host *host;
1151 struct resource *res;
1156 host = mmc_priv(mmc);
1158 if (host->board->det_pin) {
1159 if (device_can_wakeup(&pdev->dev))
1160 free_irq(gpio_to_irq(host->board->det_pin), host);
1161 device_init_wakeup(&pdev->dev, 0);
1162 gpio_free(host->board->det_pin);
1165 at91_mci_disable(host);
1166 del_timer_sync(&host->timer);
1167 mmc_remove_host(mmc);
1168 free_irq(host->irq, host);
1170 clk_disable(host->mci_clk); /* Disable the peripheral clock */
1171 clk_put(host->mci_clk);
1173 if (host->board->vcc_pin)
1174 gpio_free(host->board->vcc_pin);
1175 if (host->board->wp_pin)
1176 gpio_free(host->board->wp_pin);
1178 iounmap(host->baseaddr);
1179 res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
1180 release_mem_region(res->start, res->end - res->start + 1);
1183 platform_set_drvdata(pdev, NULL);
1184 pr_debug("MCI Removed\n");
1190 static int at91_mci_suspend(struct platform_device *pdev, pm_message_t state)
1192 struct mmc_host *mmc = platform_get_drvdata(pdev);
1193 struct at91mci_host *host = mmc_priv(mmc);
1196 if (host->board->det_pin && device_may_wakeup(&pdev->dev))
1197 enable_irq_wake(host->board->det_pin);
1200 ret = mmc_suspend_host(mmc, state);
1205 static int at91_mci_resume(struct platform_device *pdev)
1207 struct mmc_host *mmc = platform_get_drvdata(pdev);
1208 struct at91mci_host *host = mmc_priv(mmc);
1211 if (host->board->det_pin && device_may_wakeup(&pdev->dev))
1212 disable_irq_wake(host->board->det_pin);
1215 ret = mmc_resume_host(mmc);
1220 #define at91_mci_suspend NULL
1221 #define at91_mci_resume NULL
1224 static struct platform_driver at91_mci_driver = {
1225 .remove = __exit_p(at91_mci_remove),
1226 .suspend = at91_mci_suspend,
1227 .resume = at91_mci_resume,
1229 .name = DRIVER_NAME,
1230 .owner = THIS_MODULE,
1234 static int __init at91_mci_init(void)
1236 return platform_driver_probe(&at91_mci_driver, at91_mci_probe);
1239 static void __exit at91_mci_exit(void)
1241 platform_driver_unregister(&at91_mci_driver);
1244 module_init(at91_mci_init);
1245 module_exit(at91_mci_exit);
1247 MODULE_DESCRIPTION("AT91 Multimedia Card Interface driver");
1248 MODULE_AUTHOR("Nick Randell");
1249 MODULE_LICENSE("GPL");
1250 MODULE_ALIAS("platform:at91_mci");