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>
73 #include <asm/mach/mmc.h>
74 #include <asm/arch/board.h>
75 #include <asm/arch/cpu.h>
76 #include <asm/arch/gpio.h>
77 #include <asm/arch/at91_mci.h>
79 #define DRIVER_NAME "at91_mci"
81 #define FL_SENT_COMMAND (1 << 0)
82 #define FL_SENT_STOP (1 << 1)
84 #define AT91_MCI_ERRORS (AT91_MCI_RINDE | AT91_MCI_RDIRE | AT91_MCI_RCRCE \
85 | AT91_MCI_RENDE | AT91_MCI_RTOE | AT91_MCI_DCRCE \
86 | AT91_MCI_DTOE | AT91_MCI_OVRE | AT91_MCI_UNRE)
88 #define at91_mci_read(host, reg) __raw_readl((host)->baseaddr + (reg))
89 #define at91_mci_write(host, reg, val) __raw_writel((val), (host)->baseaddr + (reg))
93 * Low level type for this driver
98 struct mmc_command *cmd;
99 struct mmc_request *request;
101 void __iomem *baseaddr;
104 struct at91_mmc_data *board;
110 * Flag indicating when the command has been sent. This is used to
111 * work out whether or not to send the stop
114 /* flag for current bus settings */
117 /* DMA buffer used for transmitting */
118 unsigned int* buffer;
119 dma_addr_t physical_address;
120 unsigned int total_length;
122 /* Latest in the scatterlist that has been enabled for transfer, but not freed */
125 /* Latest in the scatterlist that has been enabled for transfer */
130 * Copy from sg to a dma block - used for transfers
132 static inline void at91_mci_sg_to_dma(struct at91mci_host *host, struct mmc_data *data)
134 unsigned int len, i, size;
135 unsigned *dmabuf = host->buffer;
137 size = host->total_length;
141 * Just loop through all entries. Size might not
142 * be the entire list though so make sure that
143 * we do not transfer too much.
145 for (i = 0; i < len; i++) {
146 struct scatterlist *sg;
148 unsigned int *sgbuffer;
152 sgbuffer = kmap_atomic(sg->page, KM_BIO_SRC_IRQ) + sg->offset;
153 amount = min(size, sg->length);
156 if (cpu_is_at91rm9200()) { /* AT91RM9200 errata */
159 for (index = 0; index < (amount / 4); index++)
160 *dmabuf++ = swab32(sgbuffer[index]);
163 memcpy(dmabuf, sgbuffer, amount);
165 kunmap_atomic(sgbuffer, KM_BIO_SRC_IRQ);
172 * Check that we didn't get a request to transfer
173 * more data than can fit into the SG list.
181 static void at91_mci_pre_dma_read(struct at91mci_host *host)
184 struct scatterlist *sg;
185 struct mmc_command *cmd;
186 struct mmc_data *data;
188 pr_debug("pre dma read\n");
192 pr_debug("no command\n");
198 pr_debug("no data\n");
202 for (i = 0; i < 2; i++) {
203 /* nothing left to transfer */
204 if (host->transfer_index >= data->sg_len) {
205 pr_debug("Nothing left to transfer (index = %d)\n", host->transfer_index);
209 /* Check to see if this needs filling */
211 if (at91_mci_read(host, ATMEL_PDC_RCR) != 0) {
212 pr_debug("Transfer active in current\n");
217 if (at91_mci_read(host, ATMEL_PDC_RNCR) != 0) {
218 pr_debug("Transfer active in next\n");
223 /* Setup the next transfer */
224 pr_debug("Using transfer index %d\n", host->transfer_index);
226 sg = &data->sg[host->transfer_index++];
227 pr_debug("sg = %p\n", sg);
229 sg->dma_address = dma_map_page(NULL, sg->page, sg->offset, sg->length, DMA_FROM_DEVICE);
231 pr_debug("dma address = %08X, length = %d\n", sg->dma_address, sg->length);
234 at91_mci_write(host, ATMEL_PDC_RPR, sg->dma_address);
235 at91_mci_write(host, ATMEL_PDC_RCR, sg->length / 4);
238 at91_mci_write(host, ATMEL_PDC_RNPR, sg->dma_address);
239 at91_mci_write(host, ATMEL_PDC_RNCR, sg->length / 4);
243 pr_debug("pre dma read done\n");
247 * Handle after a dma read
249 static void at91_mci_post_dma_read(struct at91mci_host *host)
251 struct mmc_command *cmd;
252 struct mmc_data *data;
254 pr_debug("post dma read\n");
258 pr_debug("no command\n");
264 pr_debug("no data\n");
268 while (host->in_use_index < host->transfer_index) {
269 struct scatterlist *sg;
271 pr_debug("finishing index %d\n", host->in_use_index);
273 sg = &data->sg[host->in_use_index++];
275 pr_debug("Unmapping page %08X\n", sg->dma_address);
277 dma_unmap_page(NULL, sg->dma_address, sg->length, DMA_FROM_DEVICE);
279 data->bytes_xfered += sg->length;
281 if (cpu_is_at91rm9200()) { /* AT91RM9200 errata */
282 unsigned int *buffer;
285 /* Swap the contents of the buffer */
286 buffer = kmap_atomic(sg->page, KM_BIO_SRC_IRQ) + sg->offset;
287 pr_debug("buffer = %p, length = %d\n", buffer, sg->length);
289 for (index = 0; index < (sg->length / 4); index++)
290 buffer[index] = swab32(buffer[index]);
292 kunmap_atomic(buffer, KM_BIO_SRC_IRQ);
295 flush_dcache_page(sg->page);
298 /* Is there another transfer to trigger? */
299 if (host->transfer_index < data->sg_len)
300 at91_mci_pre_dma_read(host);
302 at91_mci_write(host, AT91_MCI_IDR, AT91_MCI_ENDRX);
303 at91_mci_write(host, AT91_MCI_IER, AT91_MCI_RXBUFF);
306 pr_debug("post dma read done\n");
310 * Handle transmitted data
312 static void at91_mci_handle_transmitted(struct at91mci_host *host)
314 struct mmc_command *cmd;
315 struct mmc_data *data;
317 pr_debug("Handling the transmit\n");
319 /* Disable the transfer */
320 at91_mci_write(host, ATMEL_PDC_PTCR, ATMEL_PDC_RXTDIS | ATMEL_PDC_TXTDIS);
322 /* Now wait for cmd ready */
323 at91_mci_write(host, AT91_MCI_IDR, AT91_MCI_TXBUFE);
331 if (cmd->data->blocks > 1) {
332 pr_debug("multiple write : wait for BLKE...\n");
333 at91_mci_write(host, AT91_MCI_IER, AT91_MCI_BLKE);
335 at91_mci_write(host, AT91_MCI_IER, AT91_MCI_NOTBUSY);
337 data->bytes_xfered = host->total_length;
340 /*Handle after command sent ready*/
341 static int at91_mci_handle_cmdrdy(struct at91mci_host *host)
345 else if (!host->cmd->data) {
346 if (host->flags & FL_SENT_STOP) {
347 /*After multi block write, we must wait for NOTBUSY*/
348 at91_mci_write(host, AT91_MCI_IER, AT91_MCI_NOTBUSY);
350 } else if (host->cmd->data->flags & MMC_DATA_WRITE) {
351 /*After sendding multi-block-write command, start DMA transfer*/
352 at91_mci_write(host, AT91_MCI_IER, AT91_MCI_TXBUFE);
353 at91_mci_write(host, AT91_MCI_IER, AT91_MCI_BLKE);
354 at91_mci_write(host, ATMEL_PDC_PTCR, ATMEL_PDC_TXTEN);
357 /* command not completed, have to wait */
363 * Enable the controller
365 static void at91_mci_enable(struct at91mci_host *host)
369 at91_mci_write(host, AT91_MCI_CR, AT91_MCI_MCIEN);
370 at91_mci_write(host, AT91_MCI_IDR, 0xffffffff);
371 at91_mci_write(host, AT91_MCI_DTOR, AT91_MCI_DTOMUL_1M | AT91_MCI_DTOCYC);
372 mr = AT91_MCI_PDCMODE | 0x34a;
374 if (cpu_is_at91sam9260() || cpu_is_at91sam9263())
375 mr |= AT91_MCI_RDPROOF | AT91_MCI_WRPROOF;
377 at91_mci_write(host, AT91_MCI_MR, mr);
379 /* use Slot A or B (only one at same time) */
380 at91_mci_write(host, AT91_MCI_SDCR, host->board->slot_b);
384 * Disable the controller
386 static void at91_mci_disable(struct at91mci_host *host)
388 at91_mci_write(host, AT91_MCI_CR, AT91_MCI_MCIDIS | AT91_MCI_SWRST);
394 static void at91_mci_send_command(struct at91mci_host *host, struct mmc_command *cmd)
396 unsigned int cmdr, mr;
397 unsigned int block_length;
398 struct mmc_data *data = cmd->data;
401 unsigned int ier = 0;
405 /* Needed for leaving busy state before CMD1 */
406 if ((at91_mci_read(host, AT91_MCI_SR) & AT91_MCI_RTOE) && (cmd->opcode == 1)) {
407 pr_debug("Clearing timeout\n");
408 at91_mci_write(host, AT91_MCI_ARGR, 0);
409 at91_mci_write(host, AT91_MCI_CMDR, AT91_MCI_OPDCMD);
410 while (!(at91_mci_read(host, AT91_MCI_SR) & AT91_MCI_CMDRDY)) {
412 pr_debug("Clearing: SR = %08X\n", at91_mci_read(host, AT91_MCI_SR));
418 if (mmc_resp_type(cmd) == MMC_RSP_NONE)
419 cmdr |= AT91_MCI_RSPTYP_NONE;
421 /* if a response is expected then allow maximum response latancy */
422 cmdr |= AT91_MCI_MAXLAT;
423 /* set 136 bit response for R2, 48 bit response otherwise */
424 if (mmc_resp_type(cmd) == MMC_RSP_R2)
425 cmdr |= AT91_MCI_RSPTYP_136;
427 cmdr |= AT91_MCI_RSPTYP_48;
432 if ( data->blksz & 0x3 ) {
433 pr_debug("Unsupported block size\n");
434 cmd->error = -EINVAL;
435 mmc_request_done(host->mmc, host->request);
439 block_length = data->blksz;
440 blocks = data->blocks;
442 /* always set data start - also set direction flag for read */
443 if (data->flags & MMC_DATA_READ)
444 cmdr |= (AT91_MCI_TRDIR | AT91_MCI_TRCMD_START);
445 else if (data->flags & MMC_DATA_WRITE)
446 cmdr |= AT91_MCI_TRCMD_START;
448 if (data->flags & MMC_DATA_STREAM)
449 cmdr |= AT91_MCI_TRTYP_STREAM;
450 if (data->blocks > 1)
451 cmdr |= AT91_MCI_TRTYP_MULTIPLE;
458 if (host->flags & FL_SENT_STOP)
459 cmdr |= AT91_MCI_TRCMD_STOP;
461 if (host->bus_mode == MMC_BUSMODE_OPENDRAIN)
462 cmdr |= AT91_MCI_OPDCMD;
465 * Set the arguments and send the command
467 pr_debug("Sending command %d as %08X, arg = %08X, blocks = %d, length = %d (MR = %08X)\n",
468 cmd->opcode, cmdr, cmd->arg, blocks, block_length, at91_mci_read(host, AT91_MCI_MR));
471 at91_mci_write(host, ATMEL_PDC_PTCR, ATMEL_PDC_TXTDIS | ATMEL_PDC_RXTDIS);
472 at91_mci_write(host, ATMEL_PDC_RPR, 0);
473 at91_mci_write(host, ATMEL_PDC_RCR, 0);
474 at91_mci_write(host, ATMEL_PDC_RNPR, 0);
475 at91_mci_write(host, ATMEL_PDC_RNCR, 0);
476 at91_mci_write(host, ATMEL_PDC_TPR, 0);
477 at91_mci_write(host, ATMEL_PDC_TCR, 0);
478 at91_mci_write(host, ATMEL_PDC_TNPR, 0);
479 at91_mci_write(host, ATMEL_PDC_TNCR, 0);
480 ier = AT91_MCI_CMDRDY;
482 /* zero block length and PDC mode */
483 mr = at91_mci_read(host, AT91_MCI_MR) & 0x7fff;
484 at91_mci_write(host, AT91_MCI_MR, mr | (block_length << 16) | AT91_MCI_PDCMODE);
487 * Disable the PDC controller
489 at91_mci_write(host, ATMEL_PDC_PTCR, ATMEL_PDC_RXTDIS | ATMEL_PDC_TXTDIS);
491 if (cmdr & AT91_MCI_TRCMD_START) {
492 data->bytes_xfered = 0;
493 host->transfer_index = 0;
494 host->in_use_index = 0;
495 if (cmdr & AT91_MCI_TRDIR) {
500 host->total_length = 0;
502 at91_mci_pre_dma_read(host);
503 ier = AT91_MCI_ENDRX /* | AT91_MCI_RXBUFF */;
509 host->total_length = block_length * blocks;
510 host->buffer = dma_alloc_coherent(NULL,
512 &host->physical_address, GFP_KERNEL);
514 at91_mci_sg_to_dma(host, data);
516 pr_debug("Transmitting %d bytes\n", host->total_length);
518 at91_mci_write(host, ATMEL_PDC_TPR, host->physical_address);
519 at91_mci_write(host, ATMEL_PDC_TCR, host->total_length / 4);
520 ier = AT91_MCI_CMDRDY;
526 * Send the command and then enable the PDC - not the other way round as
527 * the data sheet says
530 at91_mci_write(host, AT91_MCI_ARGR, cmd->arg);
531 at91_mci_write(host, AT91_MCI_CMDR, cmdr);
533 if (cmdr & AT91_MCI_TRCMD_START) {
534 if (cmdr & AT91_MCI_TRDIR)
535 at91_mci_write(host, ATMEL_PDC_PTCR, ATMEL_PDC_RXTEN);
538 /* Enable selected interrupts */
539 at91_mci_write(host, AT91_MCI_IER, AT91_MCI_ERRORS | ier);
543 * Process the next step in the request
545 static void at91_mci_process_next(struct at91mci_host *host)
547 if (!(host->flags & FL_SENT_COMMAND)) {
548 host->flags |= FL_SENT_COMMAND;
549 at91_mci_send_command(host, host->request->cmd);
551 else if ((!(host->flags & FL_SENT_STOP)) && host->request->stop) {
552 host->flags |= FL_SENT_STOP;
553 at91_mci_send_command(host, host->request->stop);
556 mmc_request_done(host->mmc, host->request);
560 * Handle a command that has been completed
562 static void at91_mci_completed_command(struct at91mci_host *host)
564 struct mmc_command *cmd = host->cmd;
567 at91_mci_write(host, AT91_MCI_IDR, 0xffffffff);
569 cmd->resp[0] = at91_mci_read(host, AT91_MCI_RSPR(0));
570 cmd->resp[1] = at91_mci_read(host, AT91_MCI_RSPR(1));
571 cmd->resp[2] = at91_mci_read(host, AT91_MCI_RSPR(2));
572 cmd->resp[3] = at91_mci_read(host, AT91_MCI_RSPR(3));
575 dma_free_coherent(NULL, host->total_length, host->buffer, host->physical_address);
579 status = at91_mci_read(host, AT91_MCI_SR);
581 pr_debug("Status = %08X [%08X %08X %08X %08X]\n",
582 status, cmd->resp[0], cmd->resp[1], cmd->resp[2], cmd->resp[3]);
584 if (status & (AT91_MCI_RINDE | AT91_MCI_RDIRE | AT91_MCI_RCRCE |
585 AT91_MCI_RENDE | AT91_MCI_RTOE | AT91_MCI_DCRCE |
586 AT91_MCI_DTOE | AT91_MCI_OVRE | AT91_MCI_UNRE)) {
587 if ((status & AT91_MCI_RCRCE) && !(mmc_resp_type(cmd) & MMC_RSP_CRC)) {
591 if (status & (AT91_MCI_RTOE | AT91_MCI_DTOE))
592 cmd->error = -ETIMEDOUT;
593 else if (status & (AT91_MCI_RCRCE | AT91_MCI_DCRCE))
594 cmd->error = -EILSEQ;
598 pr_debug("Error detected and set to %d (cmd = %d, retries = %d)\n",
599 cmd->error, cmd->opcode, cmd->retries);
605 at91_mci_process_next(host);
609 * Handle an MMC request
611 static void at91_mci_request(struct mmc_host *mmc, struct mmc_request *mrq)
613 struct at91mci_host *host = mmc_priv(mmc);
617 at91_mci_process_next(host);
623 static void at91_mci_set_ios(struct mmc_host *mmc, struct mmc_ios *ios)
626 struct at91mci_host *host = mmc_priv(mmc);
627 unsigned long at91_master_clock = clk_get_rate(host->mci_clk);
629 host->bus_mode = ios->bus_mode;
631 if (ios->clock == 0) {
632 /* Disable the MCI controller */
633 at91_mci_write(host, AT91_MCI_CR, AT91_MCI_MCIDIS);
637 /* Enable the MCI controller */
638 at91_mci_write(host, AT91_MCI_CR, AT91_MCI_MCIEN);
640 if ((at91_master_clock % (ios->clock * 2)) == 0)
641 clkdiv = ((at91_master_clock / ios->clock) / 2) - 1;
643 clkdiv = (at91_master_clock / ios->clock) / 2;
645 pr_debug("clkdiv = %d. mcck = %ld\n", clkdiv,
646 at91_master_clock / (2 * (clkdiv + 1)));
648 if (ios->bus_width == MMC_BUS_WIDTH_4 && host->board->wire4) {
649 pr_debug("MMC: Setting controller bus width to 4\n");
650 at91_mci_write(host, AT91_MCI_SDCR, at91_mci_read(host, AT91_MCI_SDCR) | AT91_MCI_SDCBUS);
653 pr_debug("MMC: Setting controller bus width to 1\n");
654 at91_mci_write(host, AT91_MCI_SDCR, at91_mci_read(host, AT91_MCI_SDCR) & ~AT91_MCI_SDCBUS);
657 /* Set the clock divider */
658 at91_mci_write(host, AT91_MCI_MR, (at91_mci_read(host, AT91_MCI_MR) & ~AT91_MCI_CLKDIV) | clkdiv);
660 /* maybe switch power to the card */
661 if (host->board->vcc_pin) {
662 switch (ios->power_mode) {
664 at91_set_gpio_value(host->board->vcc_pin, 0);
668 at91_set_gpio_value(host->board->vcc_pin, 1);
675 * Handle an interrupt
677 static irqreturn_t at91_mci_irq(int irq, void *devid)
679 struct at91mci_host *host = devid;
681 unsigned int int_status, int_mask;
683 int_status = at91_mci_read(host, AT91_MCI_SR);
684 int_mask = at91_mci_read(host, AT91_MCI_IMR);
686 pr_debug("MCI irq: status = %08X, %08X, %08X\n", int_status, int_mask,
687 int_status & int_mask);
689 int_status = int_status & int_mask;
691 if (int_status & AT91_MCI_ERRORS) {
694 if (int_status & AT91_MCI_UNRE)
695 pr_debug("MMC: Underrun error\n");
696 if (int_status & AT91_MCI_OVRE)
697 pr_debug("MMC: Overrun error\n");
698 if (int_status & AT91_MCI_DTOE)
699 pr_debug("MMC: Data timeout\n");
700 if (int_status & AT91_MCI_DCRCE)
701 pr_debug("MMC: CRC error in data\n");
702 if (int_status & AT91_MCI_RTOE)
703 pr_debug("MMC: Response timeout\n");
704 if (int_status & AT91_MCI_RENDE)
705 pr_debug("MMC: Response end bit error\n");
706 if (int_status & AT91_MCI_RCRCE)
707 pr_debug("MMC: Response CRC error\n");
708 if (int_status & AT91_MCI_RDIRE)
709 pr_debug("MMC: Response direction error\n");
710 if (int_status & AT91_MCI_RINDE)
711 pr_debug("MMC: Response index error\n");
713 /* Only continue processing if no errors */
715 if (int_status & AT91_MCI_TXBUFE) {
716 pr_debug("TX buffer empty\n");
717 at91_mci_handle_transmitted(host);
720 if (int_status & AT91_MCI_ENDRX) {
722 at91_mci_post_dma_read(host);
725 if (int_status & AT91_MCI_RXBUFF) {
726 pr_debug("RX buffer full\n");
727 at91_mci_write(host, ATMEL_PDC_PTCR, ATMEL_PDC_RXTDIS | ATMEL_PDC_TXTDIS);
728 at91_mci_write(host, AT91_MCI_IDR, AT91_MCI_RXBUFF | AT91_MCI_ENDRX);
732 if (int_status & AT91_MCI_ENDTX)
733 pr_debug("Transmit has ended\n");
735 if (int_status & AT91_MCI_NOTBUSY) {
736 pr_debug("Card is ready\n");
740 if (int_status & AT91_MCI_DTIP)
741 pr_debug("Data transfer in progress\n");
743 if (int_status & AT91_MCI_BLKE) {
744 pr_debug("Block transfer has ended\n");
748 if (int_status & AT91_MCI_TXRDY)
749 pr_debug("Ready to transmit\n");
751 if (int_status & AT91_MCI_RXRDY)
752 pr_debug("Ready to receive\n");
754 if (int_status & AT91_MCI_CMDRDY) {
755 pr_debug("Command ready\n");
756 completed = at91_mci_handle_cmdrdy(host);
761 pr_debug("Completed command\n");
762 at91_mci_write(host, AT91_MCI_IDR, 0xffffffff);
763 at91_mci_completed_command(host);
765 at91_mci_write(host, AT91_MCI_IDR, int_status);
770 static irqreturn_t at91_mmc_det_irq(int irq, void *_host)
772 struct at91mci_host *host = _host;
773 int present = !at91_get_gpio_value(irq);
776 * we expect this irq on both insert and remove,
777 * and use a short delay to debounce.
779 if (present != host->present) {
780 host->present = present;
781 pr_debug("%s: card %s\n", mmc_hostname(host->mmc),
782 present ? "insert" : "remove");
784 pr_debug("****** Resetting SD-card bus width ******\n");
785 at91_mci_write(host, AT91_MCI_SDCR, at91_mci_read(host, AT91_MCI_SDCR) & ~AT91_MCI_SDCBUS);
787 mmc_detect_change(host->mmc, msecs_to_jiffies(100));
792 static int at91_mci_get_ro(struct mmc_host *mmc)
795 struct at91mci_host *host = mmc_priv(mmc);
797 if (host->board->wp_pin) {
798 read_only = at91_get_gpio_value(host->board->wp_pin);
799 printk(KERN_WARNING "%s: card is %s\n", mmc_hostname(mmc),
800 (read_only ? "read-only" : "read-write") );
803 printk(KERN_WARNING "%s: host does not support reading read-only "
804 "switch. Assuming write-enable.\n", mmc_hostname(mmc));
809 static const struct mmc_host_ops at91_mci_ops = {
810 .request = at91_mci_request,
811 .set_ios = at91_mci_set_ios,
812 .get_ro = at91_mci_get_ro,
816 * Probe for the device
818 static int __init at91_mci_probe(struct platform_device *pdev)
820 struct mmc_host *mmc;
821 struct at91mci_host *host;
822 struct resource *res;
825 pr_debug("Probe MCI devices\n");
827 res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
831 if (!request_mem_region(res->start, res->end - res->start + 1, DRIVER_NAME))
834 mmc = mmc_alloc_host(sizeof(struct at91mci_host), &pdev->dev);
836 pr_debug("Failed to allocate mmc host\n");
837 release_mem_region(res->start, res->end - res->start + 1);
841 mmc->ops = &at91_mci_ops;
843 mmc->f_max = 25000000;
844 mmc->ocr_avail = MMC_VDD_32_33 | MMC_VDD_33_34;
846 mmc->max_blk_size = 4095;
847 mmc->max_blk_count = mmc->max_req_size;
849 host = mmc_priv(mmc);
853 host->board = pdev->dev.platform_data;
854 if (host->board->wire4) {
855 if (cpu_is_at91sam9260() || cpu_is_at91sam9263())
856 mmc->caps |= MMC_CAP_4_BIT_DATA;
858 printk("AT91 MMC: 4 wire bus mode not supported"
859 " - using 1 wire\n");
865 host->mci_clk = clk_get(&pdev->dev, "mci_clk");
866 if (IS_ERR(host->mci_clk)) {
867 printk(KERN_ERR "AT91 MMC: no clock defined.\n");
869 release_mem_region(res->start, res->end - res->start + 1);
876 host->baseaddr = ioremap(res->start, res->end - res->start + 1);
877 if (!host->baseaddr) {
878 clk_put(host->mci_clk);
880 release_mem_region(res->start, res->end - res->start + 1);
887 clk_enable(host->mci_clk); /* Enable the peripheral clock */
888 at91_mci_disable(host);
889 at91_mci_enable(host);
892 * Allocate the MCI interrupt
894 host->irq = platform_get_irq(pdev, 0);
895 ret = request_irq(host->irq, at91_mci_irq, IRQF_SHARED, DRIVER_NAME, host);
897 printk(KERN_ERR "AT91 MMC: Failed to request MCI interrupt\n");
898 clk_disable(host->mci_clk);
899 clk_put(host->mci_clk);
901 iounmap(host->baseaddr);
902 release_mem_region(res->start, res->end - res->start + 1);
906 platform_set_drvdata(pdev, mmc);
909 * Add host to MMC layer
911 if (host->board->det_pin) {
912 host->present = !at91_get_gpio_value(host->board->det_pin);
913 device_init_wakeup(&pdev->dev, 1);
921 * monitor card insertion/removal if we can
923 if (host->board->det_pin) {
924 ret = request_irq(host->board->det_pin, at91_mmc_det_irq,
925 0, DRIVER_NAME, host);
927 printk(KERN_ERR "AT91 MMC: Couldn't allocate MMC detect irq\n");
930 pr_debug("Added MCI driver\n");
938 static int __exit at91_mci_remove(struct platform_device *pdev)
940 struct mmc_host *mmc = platform_get_drvdata(pdev);
941 struct at91mci_host *host;
942 struct resource *res;
947 host = mmc_priv(mmc);
949 if (host->board->det_pin) {
950 device_init_wakeup(&pdev->dev, 0);
951 free_irq(host->board->det_pin, host);
952 cancel_delayed_work(&host->mmc->detect);
955 at91_mci_disable(host);
956 mmc_remove_host(mmc);
957 free_irq(host->irq, host);
959 clk_disable(host->mci_clk); /* Disable the peripheral clock */
960 clk_put(host->mci_clk);
962 iounmap(host->baseaddr);
963 res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
964 release_mem_region(res->start, res->end - res->start + 1);
967 platform_set_drvdata(pdev, NULL);
968 pr_debug("MCI Removed\n");
974 static int at91_mci_suspend(struct platform_device *pdev, pm_message_t state)
976 struct mmc_host *mmc = platform_get_drvdata(pdev);
977 struct at91mci_host *host = mmc_priv(mmc);
980 if (host->board->det_pin && device_may_wakeup(&pdev->dev))
981 enable_irq_wake(host->board->det_pin);
984 ret = mmc_suspend_host(mmc, state);
989 static int at91_mci_resume(struct platform_device *pdev)
991 struct mmc_host *mmc = platform_get_drvdata(pdev);
992 struct at91mci_host *host = mmc_priv(mmc);
995 if (host->board->det_pin && device_may_wakeup(&pdev->dev))
996 disable_irq_wake(host->board->det_pin);
999 ret = mmc_resume_host(mmc);
1004 #define at91_mci_suspend NULL
1005 #define at91_mci_resume NULL
1008 static struct platform_driver at91_mci_driver = {
1009 .remove = __exit_p(at91_mci_remove),
1010 .suspend = at91_mci_suspend,
1011 .resume = at91_mci_resume,
1013 .name = DRIVER_NAME,
1014 .owner = THIS_MODULE,
1018 static int __init at91_mci_init(void)
1020 return platform_driver_probe(&at91_mci_driver, at91_mci_probe);
1023 static void __exit at91_mci_exit(void)
1025 platform_driver_unregister(&at91_mci_driver);
1028 module_init(at91_mci_init);
1029 module_exit(at91_mci_exit);
1031 MODULE_DESCRIPTION("AT91 Multimedia Card Interface driver");
1032 MODULE_AUTHOR("Nick Randell");
1033 MODULE_LICENSE("GPL");