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 <asm/arch/board.h>
77 #include <asm/arch/cpu.h>
78 #include <asm/arch/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 */
131 * Copy from sg to a dma block - used for transfers
133 static inline void at91_mci_sg_to_dma(struct at91mci_host *host, struct mmc_data *data)
135 unsigned int len, i, size;
136 unsigned *dmabuf = host->buffer;
138 size = host->total_length;
142 * Just loop through all entries. Size might not
143 * be the entire list though so make sure that
144 * we do not transfer too much.
146 for (i = 0; i < len; i++) {
147 struct scatterlist *sg;
149 unsigned int *sgbuffer;
153 sgbuffer = kmap_atomic(sg_page(sg), KM_BIO_SRC_IRQ) + sg->offset;
154 amount = min(size, sg->length);
157 if (cpu_is_at91rm9200()) { /* AT91RM9200 errata */
160 for (index = 0; index < (amount / 4); index++)
161 *dmabuf++ = swab32(sgbuffer[index]);
164 memcpy(dmabuf, sgbuffer, amount);
166 kunmap_atomic(sgbuffer, KM_BIO_SRC_IRQ);
173 * Check that we didn't get a request to transfer
174 * more data than can fit into the SG list.
182 static void at91_mci_pre_dma_read(struct at91mci_host *host)
185 struct scatterlist *sg;
186 struct mmc_command *cmd;
187 struct mmc_data *data;
189 pr_debug("pre dma read\n");
193 pr_debug("no command\n");
199 pr_debug("no data\n");
203 for (i = 0; i < 2; i++) {
204 /* nothing left to transfer */
205 if (host->transfer_index >= data->sg_len) {
206 pr_debug("Nothing left to transfer (index = %d)\n", host->transfer_index);
210 /* Check to see if this needs filling */
212 if (at91_mci_read(host, ATMEL_PDC_RCR) != 0) {
213 pr_debug("Transfer active in current\n");
218 if (at91_mci_read(host, ATMEL_PDC_RNCR) != 0) {
219 pr_debug("Transfer active in next\n");
224 /* Setup the next transfer */
225 pr_debug("Using transfer index %d\n", host->transfer_index);
227 sg = &data->sg[host->transfer_index++];
228 pr_debug("sg = %p\n", sg);
230 sg->dma_address = dma_map_page(NULL, sg_page(sg), sg->offset, sg->length, DMA_FROM_DEVICE);
232 pr_debug("dma address = %08X, length = %d\n", sg->dma_address, sg->length);
235 at91_mci_write(host, ATMEL_PDC_RPR, sg->dma_address);
236 at91_mci_write(host, ATMEL_PDC_RCR, sg->length / 4);
239 at91_mci_write(host, ATMEL_PDC_RNPR, sg->dma_address);
240 at91_mci_write(host, ATMEL_PDC_RNCR, sg->length / 4);
244 pr_debug("pre dma read done\n");
248 * Handle after a dma read
250 static void at91_mci_post_dma_read(struct at91mci_host *host)
252 struct mmc_command *cmd;
253 struct mmc_data *data;
255 pr_debug("post dma read\n");
259 pr_debug("no command\n");
265 pr_debug("no data\n");
269 while (host->in_use_index < host->transfer_index) {
270 struct scatterlist *sg;
272 pr_debug("finishing index %d\n", host->in_use_index);
274 sg = &data->sg[host->in_use_index++];
276 pr_debug("Unmapping page %08X\n", sg->dma_address);
278 dma_unmap_page(NULL, sg->dma_address, sg->length, DMA_FROM_DEVICE);
280 data->bytes_xfered += sg->length;
282 if (cpu_is_at91rm9200()) { /* AT91RM9200 errata */
283 unsigned int *buffer;
286 /* Swap the contents of the buffer */
287 buffer = kmap_atomic(sg_page(sg), KM_BIO_SRC_IRQ) + sg->offset;
288 pr_debug("buffer = %p, length = %d\n", buffer, sg->length);
290 for (index = 0; index < (sg->length / 4); index++)
291 buffer[index] = swab32(buffer[index]);
293 kunmap_atomic(buffer, KM_BIO_SRC_IRQ);
296 flush_dcache_page(sg_page(sg));
299 /* Is there another transfer to trigger? */
300 if (host->transfer_index < data->sg_len)
301 at91_mci_pre_dma_read(host);
303 at91_mci_write(host, AT91_MCI_IDR, AT91_MCI_ENDRX);
304 at91_mci_write(host, AT91_MCI_IER, AT91_MCI_RXBUFF);
307 pr_debug("post dma read done\n");
311 * Handle transmitted data
313 static void at91_mci_handle_transmitted(struct at91mci_host *host)
315 struct mmc_command *cmd;
316 struct mmc_data *data;
318 pr_debug("Handling the transmit\n");
320 /* Disable the transfer */
321 at91_mci_write(host, ATMEL_PDC_PTCR, ATMEL_PDC_RXTDIS | ATMEL_PDC_TXTDIS);
323 /* Now wait for cmd ready */
324 at91_mci_write(host, AT91_MCI_IDR, AT91_MCI_TXBUFE);
332 if (cmd->data->blocks > 1) {
333 pr_debug("multiple write : wait for BLKE...\n");
334 at91_mci_write(host, AT91_MCI_IER, AT91_MCI_BLKE);
336 at91_mci_write(host, AT91_MCI_IER, AT91_MCI_NOTBUSY);
338 data->bytes_xfered = host->total_length;
341 /*Handle after command sent ready*/
342 static int at91_mci_handle_cmdrdy(struct at91mci_host *host)
346 else if (!host->cmd->data) {
347 if (host->flags & FL_SENT_STOP) {
348 /*After multi block write, we must wait for NOTBUSY*/
349 at91_mci_write(host, AT91_MCI_IER, AT91_MCI_NOTBUSY);
351 } else if (host->cmd->data->flags & MMC_DATA_WRITE) {
352 /*After sendding multi-block-write command, start DMA transfer*/
353 at91_mci_write(host, AT91_MCI_IER, AT91_MCI_TXBUFE);
354 at91_mci_write(host, AT91_MCI_IER, AT91_MCI_BLKE);
355 at91_mci_write(host, ATMEL_PDC_PTCR, ATMEL_PDC_TXTEN);
358 /* command not completed, have to wait */
364 * Enable the controller
366 static void at91_mci_enable(struct at91mci_host *host)
370 at91_mci_write(host, AT91_MCI_CR, AT91_MCI_MCIEN);
371 at91_mci_write(host, AT91_MCI_IDR, 0xffffffff);
372 at91_mci_write(host, AT91_MCI_DTOR, AT91_MCI_DTOMUL_1M | AT91_MCI_DTOCYC);
373 mr = AT91_MCI_PDCMODE | 0x34a;
375 if (cpu_is_at91sam9260() || cpu_is_at91sam9263())
376 mr |= AT91_MCI_RDPROOF | AT91_MCI_WRPROOF;
378 at91_mci_write(host, AT91_MCI_MR, mr);
380 /* use Slot A or B (only one at same time) */
381 at91_mci_write(host, AT91_MCI_SDCR, host->board->slot_b);
385 * Disable the controller
387 static void at91_mci_disable(struct at91mci_host *host)
389 at91_mci_write(host, AT91_MCI_CR, AT91_MCI_MCIDIS | AT91_MCI_SWRST);
395 static void at91_mci_send_command(struct at91mci_host *host, struct mmc_command *cmd)
397 unsigned int cmdr, mr;
398 unsigned int block_length;
399 struct mmc_data *data = cmd->data;
402 unsigned int ier = 0;
406 /* Needed for leaving busy state before CMD1 */
407 if ((at91_mci_read(host, AT91_MCI_SR) & AT91_MCI_RTOE) && (cmd->opcode == 1)) {
408 pr_debug("Clearing timeout\n");
409 at91_mci_write(host, AT91_MCI_ARGR, 0);
410 at91_mci_write(host, AT91_MCI_CMDR, AT91_MCI_OPDCMD);
411 while (!(at91_mci_read(host, AT91_MCI_SR) & AT91_MCI_CMDRDY)) {
413 pr_debug("Clearing: SR = %08X\n", at91_mci_read(host, AT91_MCI_SR));
419 if (mmc_resp_type(cmd) == MMC_RSP_NONE)
420 cmdr |= AT91_MCI_RSPTYP_NONE;
422 /* if a response is expected then allow maximum response latancy */
423 cmdr |= AT91_MCI_MAXLAT;
424 /* set 136 bit response for R2, 48 bit response otherwise */
425 if (mmc_resp_type(cmd) == MMC_RSP_R2)
426 cmdr |= AT91_MCI_RSPTYP_136;
428 cmdr |= AT91_MCI_RSPTYP_48;
433 if ( data->blksz & 0x3 ) {
434 pr_debug("Unsupported block size\n");
435 cmd->error = -EINVAL;
436 mmc_request_done(host->mmc, host->request);
440 block_length = data->blksz;
441 blocks = data->blocks;
443 /* always set data start - also set direction flag for read */
444 if (data->flags & MMC_DATA_READ)
445 cmdr |= (AT91_MCI_TRDIR | AT91_MCI_TRCMD_START);
446 else if (data->flags & MMC_DATA_WRITE)
447 cmdr |= AT91_MCI_TRCMD_START;
449 if (data->flags & MMC_DATA_STREAM)
450 cmdr |= AT91_MCI_TRTYP_STREAM;
451 if (data->blocks > 1)
452 cmdr |= AT91_MCI_TRTYP_MULTIPLE;
459 if (host->flags & FL_SENT_STOP)
460 cmdr |= AT91_MCI_TRCMD_STOP;
462 if (host->bus_mode == MMC_BUSMODE_OPENDRAIN)
463 cmdr |= AT91_MCI_OPDCMD;
466 * Set the arguments and send the command
468 pr_debug("Sending command %d as %08X, arg = %08X, blocks = %d, length = %d (MR = %08X)\n",
469 cmd->opcode, cmdr, cmd->arg, blocks, block_length, at91_mci_read(host, AT91_MCI_MR));
472 at91_mci_write(host, ATMEL_PDC_PTCR, ATMEL_PDC_TXTDIS | ATMEL_PDC_RXTDIS);
473 at91_mci_write(host, ATMEL_PDC_RPR, 0);
474 at91_mci_write(host, ATMEL_PDC_RCR, 0);
475 at91_mci_write(host, ATMEL_PDC_RNPR, 0);
476 at91_mci_write(host, ATMEL_PDC_RNCR, 0);
477 at91_mci_write(host, ATMEL_PDC_TPR, 0);
478 at91_mci_write(host, ATMEL_PDC_TCR, 0);
479 at91_mci_write(host, ATMEL_PDC_TNPR, 0);
480 at91_mci_write(host, ATMEL_PDC_TNCR, 0);
481 ier = AT91_MCI_CMDRDY;
483 /* zero block length and PDC mode */
484 mr = at91_mci_read(host, AT91_MCI_MR) & 0x7fff;
485 at91_mci_write(host, AT91_MCI_MR, mr | (block_length << 16) | AT91_MCI_PDCMODE);
488 * Disable the PDC controller
490 at91_mci_write(host, ATMEL_PDC_PTCR, ATMEL_PDC_RXTDIS | ATMEL_PDC_TXTDIS);
492 if (cmdr & AT91_MCI_TRCMD_START) {
493 data->bytes_xfered = 0;
494 host->transfer_index = 0;
495 host->in_use_index = 0;
496 if (cmdr & AT91_MCI_TRDIR) {
501 host->total_length = 0;
503 at91_mci_pre_dma_read(host);
504 ier = AT91_MCI_ENDRX /* | AT91_MCI_RXBUFF */;
510 host->total_length = block_length * blocks;
511 host->buffer = dma_alloc_coherent(NULL,
513 &host->physical_address, GFP_KERNEL);
515 at91_mci_sg_to_dma(host, data);
517 pr_debug("Transmitting %d bytes\n", host->total_length);
519 at91_mci_write(host, ATMEL_PDC_TPR, host->physical_address);
520 at91_mci_write(host, ATMEL_PDC_TCR, host->total_length / 4);
521 ier = AT91_MCI_CMDRDY;
527 * Send the command and then enable the PDC - not the other way round as
528 * the data sheet says
531 at91_mci_write(host, AT91_MCI_ARGR, cmd->arg);
532 at91_mci_write(host, AT91_MCI_CMDR, cmdr);
534 if (cmdr & AT91_MCI_TRCMD_START) {
535 if (cmdr & AT91_MCI_TRDIR)
536 at91_mci_write(host, ATMEL_PDC_PTCR, ATMEL_PDC_RXTEN);
539 /* Enable selected interrupts */
540 at91_mci_write(host, AT91_MCI_IER, AT91_MCI_ERRORS | ier);
544 * Process the next step in the request
546 static void at91_mci_process_next(struct at91mci_host *host)
548 if (!(host->flags & FL_SENT_COMMAND)) {
549 host->flags |= FL_SENT_COMMAND;
550 at91_mci_send_command(host, host->request->cmd);
552 else if ((!(host->flags & FL_SENT_STOP)) && host->request->stop) {
553 host->flags |= FL_SENT_STOP;
554 at91_mci_send_command(host, host->request->stop);
557 mmc_request_done(host->mmc, host->request);
561 * Handle a command that has been completed
563 static void at91_mci_completed_command(struct at91mci_host *host)
565 struct mmc_command *cmd = host->cmd;
568 at91_mci_write(host, AT91_MCI_IDR, 0xffffffff);
570 cmd->resp[0] = at91_mci_read(host, AT91_MCI_RSPR(0));
571 cmd->resp[1] = at91_mci_read(host, AT91_MCI_RSPR(1));
572 cmd->resp[2] = at91_mci_read(host, AT91_MCI_RSPR(2));
573 cmd->resp[3] = at91_mci_read(host, AT91_MCI_RSPR(3));
576 dma_free_coherent(NULL, host->total_length, host->buffer, host->physical_address);
580 status = at91_mci_read(host, AT91_MCI_SR);
582 pr_debug("Status = %08X [%08X %08X %08X %08X]\n",
583 status, cmd->resp[0], cmd->resp[1], cmd->resp[2], cmd->resp[3]);
585 if (status & AT91_MCI_ERRORS) {
586 if ((status & AT91_MCI_RCRCE) && !(mmc_resp_type(cmd) & MMC_RSP_CRC)) {
590 if (status & (AT91_MCI_RTOE | AT91_MCI_DTOE))
591 cmd->error = -ETIMEDOUT;
592 else if (status & (AT91_MCI_RCRCE | AT91_MCI_DCRCE))
593 cmd->error = -EILSEQ;
597 pr_debug("Error detected and set to %d (cmd = %d, retries = %d)\n",
598 cmd->error, cmd->opcode, cmd->retries);
604 at91_mci_process_next(host);
608 * Handle an MMC request
610 static void at91_mci_request(struct mmc_host *mmc, struct mmc_request *mrq)
612 struct at91mci_host *host = mmc_priv(mmc);
616 at91_mci_process_next(host);
622 static void at91_mci_set_ios(struct mmc_host *mmc, struct mmc_ios *ios)
625 struct at91mci_host *host = mmc_priv(mmc);
626 unsigned long at91_master_clock = clk_get_rate(host->mci_clk);
628 host->bus_mode = ios->bus_mode;
630 if (ios->clock == 0) {
631 /* Disable the MCI controller */
632 at91_mci_write(host, AT91_MCI_CR, AT91_MCI_MCIDIS);
636 /* Enable the MCI controller */
637 at91_mci_write(host, AT91_MCI_CR, AT91_MCI_MCIEN);
639 if ((at91_master_clock % (ios->clock * 2)) == 0)
640 clkdiv = ((at91_master_clock / ios->clock) / 2) - 1;
642 clkdiv = (at91_master_clock / ios->clock) / 2;
644 pr_debug("clkdiv = %d. mcck = %ld\n", clkdiv,
645 at91_master_clock / (2 * (clkdiv + 1)));
647 if (ios->bus_width == MMC_BUS_WIDTH_4 && host->board->wire4) {
648 pr_debug("MMC: Setting controller bus width to 4\n");
649 at91_mci_write(host, AT91_MCI_SDCR, at91_mci_read(host, AT91_MCI_SDCR) | AT91_MCI_SDCBUS);
652 pr_debug("MMC: Setting controller bus width to 1\n");
653 at91_mci_write(host, AT91_MCI_SDCR, at91_mci_read(host, AT91_MCI_SDCR) & ~AT91_MCI_SDCBUS);
656 /* Set the clock divider */
657 at91_mci_write(host, AT91_MCI_MR, (at91_mci_read(host, AT91_MCI_MR) & ~AT91_MCI_CLKDIV) | clkdiv);
659 /* maybe switch power to the card */
660 if (host->board->vcc_pin) {
661 switch (ios->power_mode) {
663 gpio_set_value(host->board->vcc_pin, 0);
666 gpio_set_value(host->board->vcc_pin, 1);
677 * Handle an interrupt
679 static irqreturn_t at91_mci_irq(int irq, void *devid)
681 struct at91mci_host *host = devid;
683 unsigned int int_status, int_mask;
685 int_status = at91_mci_read(host, AT91_MCI_SR);
686 int_mask = at91_mci_read(host, AT91_MCI_IMR);
688 pr_debug("MCI irq: status = %08X, %08X, %08X\n", int_status, int_mask,
689 int_status & int_mask);
691 int_status = int_status & int_mask;
693 if (int_status & AT91_MCI_ERRORS) {
696 if (int_status & AT91_MCI_UNRE)
697 pr_debug("MMC: Underrun error\n");
698 if (int_status & AT91_MCI_OVRE)
699 pr_debug("MMC: Overrun error\n");
700 if (int_status & AT91_MCI_DTOE)
701 pr_debug("MMC: Data timeout\n");
702 if (int_status & AT91_MCI_DCRCE)
703 pr_debug("MMC: CRC error in data\n");
704 if (int_status & AT91_MCI_RTOE)
705 pr_debug("MMC: Response timeout\n");
706 if (int_status & AT91_MCI_RENDE)
707 pr_debug("MMC: Response end bit error\n");
708 if (int_status & AT91_MCI_RCRCE)
709 pr_debug("MMC: Response CRC error\n");
710 if (int_status & AT91_MCI_RDIRE)
711 pr_debug("MMC: Response direction error\n");
712 if (int_status & AT91_MCI_RINDE)
713 pr_debug("MMC: Response index error\n");
715 /* Only continue processing if no errors */
717 if (int_status & AT91_MCI_TXBUFE) {
718 pr_debug("TX buffer empty\n");
719 at91_mci_handle_transmitted(host);
722 if (int_status & AT91_MCI_ENDRX) {
724 at91_mci_post_dma_read(host);
727 if (int_status & AT91_MCI_RXBUFF) {
728 pr_debug("RX buffer full\n");
729 at91_mci_write(host, ATMEL_PDC_PTCR, ATMEL_PDC_RXTDIS | ATMEL_PDC_TXTDIS);
730 at91_mci_write(host, AT91_MCI_IDR, AT91_MCI_RXBUFF | AT91_MCI_ENDRX);
734 if (int_status & AT91_MCI_ENDTX)
735 pr_debug("Transmit has ended\n");
737 if (int_status & AT91_MCI_NOTBUSY) {
738 pr_debug("Card is ready\n");
742 if (int_status & AT91_MCI_DTIP)
743 pr_debug("Data transfer in progress\n");
745 if (int_status & AT91_MCI_BLKE) {
746 pr_debug("Block transfer has ended\n");
750 if (int_status & AT91_MCI_TXRDY)
751 pr_debug("Ready to transmit\n");
753 if (int_status & AT91_MCI_RXRDY)
754 pr_debug("Ready to receive\n");
756 if (int_status & AT91_MCI_CMDRDY) {
757 pr_debug("Command ready\n");
758 completed = at91_mci_handle_cmdrdy(host);
763 pr_debug("Completed command\n");
764 at91_mci_write(host, AT91_MCI_IDR, 0xffffffff);
765 at91_mci_completed_command(host);
767 at91_mci_write(host, AT91_MCI_IDR, int_status);
772 static irqreturn_t at91_mmc_det_irq(int irq, void *_host)
774 struct at91mci_host *host = _host;
775 int present = !gpio_get_value(irq_to_gpio(irq));
778 * we expect this irq on both insert and remove,
779 * and use a short delay to debounce.
781 if (present != host->present) {
782 host->present = present;
783 pr_debug("%s: card %s\n", mmc_hostname(host->mmc),
784 present ? "insert" : "remove");
786 pr_debug("****** Resetting SD-card bus width ******\n");
787 at91_mci_write(host, AT91_MCI_SDCR, at91_mci_read(host, AT91_MCI_SDCR) & ~AT91_MCI_SDCBUS);
789 mmc_detect_change(host->mmc, msecs_to_jiffies(100));
794 static int at91_mci_get_ro(struct mmc_host *mmc)
797 struct at91mci_host *host = mmc_priv(mmc);
799 if (host->board->wp_pin) {
800 read_only = gpio_get_value(host->board->wp_pin);
801 printk(KERN_WARNING "%s: card is %s\n", mmc_hostname(mmc),
802 (read_only ? "read-only" : "read-write") );
805 printk(KERN_WARNING "%s: host does not support reading read-only "
806 "switch. Assuming write-enable.\n", mmc_hostname(mmc));
811 static const struct mmc_host_ops at91_mci_ops = {
812 .request = at91_mci_request,
813 .set_ios = at91_mci_set_ios,
814 .get_ro = at91_mci_get_ro,
818 * Probe for the device
820 static int __init at91_mci_probe(struct platform_device *pdev)
822 struct mmc_host *mmc;
823 struct at91mci_host *host;
824 struct resource *res;
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);
837 dev_dbg(&pdev->dev, "couldn't allocate mmc host\n");
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 dev_warn(&pdev->dev, "4 wire bus mode not supported"
859 " - using 1 wire\n");
863 * Reserve GPIOs ... board init code makes sure these pins are set
864 * up as GPIOs with the right direction (input, except for vcc)
866 if (host->board->det_pin) {
867 ret = gpio_request(host->board->det_pin, "mmc_detect");
869 dev_dbg(&pdev->dev, "couldn't claim card detect pin\n");
873 if (host->board->wp_pin) {
874 ret = gpio_request(host->board->wp_pin, "mmc_wp");
876 dev_dbg(&pdev->dev, "couldn't claim wp sense pin\n");
880 if (host->board->vcc_pin) {
881 ret = gpio_request(host->board->vcc_pin, "mmc_vcc");
883 dev_dbg(&pdev->dev, "couldn't claim vcc switch pin\n");
891 host->mci_clk = clk_get(&pdev->dev, "mci_clk");
892 if (IS_ERR(host->mci_clk)) {
894 dev_dbg(&pdev->dev, "no mci_clk?\n");
901 host->baseaddr = ioremap(res->start, res->end - res->start + 1);
902 if (!host->baseaddr) {
910 clk_enable(host->mci_clk); /* Enable the peripheral clock */
911 at91_mci_disable(host);
912 at91_mci_enable(host);
915 * Allocate the MCI interrupt
917 host->irq = platform_get_irq(pdev, 0);
918 ret = request_irq(host->irq, at91_mci_irq, IRQF_SHARED,
919 mmc_hostname(mmc), host);
921 dev_dbg(&pdev->dev, "request MCI interrupt failed\n");
925 platform_set_drvdata(pdev, mmc);
928 * Add host to MMC layer
930 if (host->board->det_pin) {
931 host->present = !gpio_get_value(host->board->det_pin);
939 * monitor card insertion/removal if we can
941 if (host->board->det_pin) {
942 ret = request_irq(gpio_to_irq(host->board->det_pin),
943 at91_mmc_det_irq, 0, mmc_hostname(mmc), host);
945 dev_warn(&pdev->dev, "request MMC detect irq failed\n");
947 device_init_wakeup(&pdev->dev, 1);
950 pr_debug("Added MCI driver\n");
955 clk_disable(host->mci_clk);
956 iounmap(host->baseaddr);
958 clk_put(host->mci_clk);
960 if (host->board->vcc_pin)
961 gpio_free(host->board->vcc_pin);
963 if (host->board->wp_pin)
964 gpio_free(host->board->wp_pin);
966 if (host->board->det_pin)
967 gpio_free(host->board->det_pin);
971 release_mem_region(res->start, res->end - res->start + 1);
972 dev_err(&pdev->dev, "probe failed, err %d\n", ret);
979 static int __exit at91_mci_remove(struct platform_device *pdev)
981 struct mmc_host *mmc = platform_get_drvdata(pdev);
982 struct at91mci_host *host;
983 struct resource *res;
988 host = mmc_priv(mmc);
990 if (host->board->det_pin) {
991 if (device_can_wakeup(&pdev->dev))
992 free_irq(gpio_to_irq(host->board->det_pin), host);
993 device_init_wakeup(&pdev->dev, 0);
994 gpio_free(host->board->det_pin);
997 at91_mci_disable(host);
998 mmc_remove_host(mmc);
999 free_irq(host->irq, host);
1001 clk_disable(host->mci_clk); /* Disable the peripheral clock */
1002 clk_put(host->mci_clk);
1004 if (host->board->vcc_pin)
1005 gpio_free(host->board->vcc_pin);
1006 if (host->board->wp_pin)
1007 gpio_free(host->board->wp_pin);
1009 iounmap(host->baseaddr);
1010 res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
1011 release_mem_region(res->start, res->end - res->start + 1);
1014 platform_set_drvdata(pdev, NULL);
1015 pr_debug("MCI Removed\n");
1021 static int at91_mci_suspend(struct platform_device *pdev, pm_message_t state)
1023 struct mmc_host *mmc = platform_get_drvdata(pdev);
1024 struct at91mci_host *host = mmc_priv(mmc);
1027 if (host->board->det_pin && device_may_wakeup(&pdev->dev))
1028 enable_irq_wake(host->board->det_pin);
1031 ret = mmc_suspend_host(mmc, state);
1036 static int at91_mci_resume(struct platform_device *pdev)
1038 struct mmc_host *mmc = platform_get_drvdata(pdev);
1039 struct at91mci_host *host = mmc_priv(mmc);
1042 if (host->board->det_pin && device_may_wakeup(&pdev->dev))
1043 disable_irq_wake(host->board->det_pin);
1046 ret = mmc_resume_host(mmc);
1051 #define at91_mci_suspend NULL
1052 #define at91_mci_resume NULL
1055 static struct platform_driver at91_mci_driver = {
1056 .remove = __exit_p(at91_mci_remove),
1057 .suspend = at91_mci_suspend,
1058 .resume = at91_mci_resume,
1060 .name = DRIVER_NAME,
1061 .owner = THIS_MODULE,
1065 static int __init at91_mci_init(void)
1067 return platform_driver_probe(&at91_mci_driver, at91_mci_probe);
1070 static void __exit at91_mci_exit(void)
1072 platform_driver_unregister(&at91_mci_driver);
1075 module_init(at91_mci_init);
1076 module_exit(at91_mci_exit);
1078 MODULE_DESCRIPTION("AT91 Multimedia Card Interface driver");
1079 MODULE_AUTHOR("Nick Randell");
1080 MODULE_LICENSE("GPL");
1081 MODULE_ALIAS("platform:at91_mci");