diff options
Diffstat (limited to 'drivers/mmc/at91_mci.c')
| -rw-r--r-- | drivers/mmc/at91_mci.c | 1001 |
1 files changed, 0 insertions, 1001 deletions
diff --git a/drivers/mmc/at91_mci.c b/drivers/mmc/at91_mci.c deleted file mode 100644 index e37943c314cb..000000000000 --- a/drivers/mmc/at91_mci.c +++ /dev/null @@ -1,1001 +0,0 @@ -/* - * linux/drivers/mmc/at91_mci.c - ATMEL AT91 MCI Driver - * - * Copyright (C) 2005 Cougar Creek Computing Devices Ltd, All Rights Reserved - * - * Copyright (C) 2006 Malcolm Noyes - * - * This program is free software; you can redistribute it and/or modify - * it under the terms of the GNU General Public License version 2 as - * published by the Free Software Foundation. - */ - -/* - This is the AT91 MCI driver that has been tested with both MMC cards - and SD-cards. Boards that support write protect are now supported. - The CCAT91SBC001 board does not support SD cards. - - The three entry points are at91_mci_request, at91_mci_set_ios - and at91_mci_get_ro. - - SET IOS - This configures the device to put it into the correct mode and clock speed - required. - - MCI REQUEST - MCI request processes the commands sent in the mmc_request structure. This - can consist of a processing command and a stop command in the case of - multiple block transfers. - - There are three main types of request, commands, reads and writes. - - Commands are straight forward. The command is submitted to the controller and - the request function returns. When the controller generates an interrupt to indicate - the command is finished, the response to the command are read and the mmc_request_done - function called to end the request. - - Reads and writes work in a similar manner to normal commands but involve the PDC (DMA) - controller to manage the transfers. - - A read is done from the controller directly to the scatterlist passed in from the request. - Due to a bug in the AT91RM9200 controller, when a read is completed, all the words are byte - swapped in the scatterlist buffers. AT91SAM926x are not affected by this bug. - - The sequence of read interrupts is: ENDRX, RXBUFF, CMDRDY - - A write is slightly different in that the bytes to write are read from the scatterlist - into a dma memory buffer (this is in case the source buffer should be read only). The - entire write buffer is then done from this single dma memory buffer. - - The sequence of write interrupts is: ENDTX, TXBUFE, NOTBUSY, CMDRDY - - GET RO - Gets the status of the write protect pin, if available. -*/ - -#include <linux/module.h> -#include <linux/moduleparam.h> -#include <linux/init.h> -#include <linux/ioport.h> -#include <linux/platform_device.h> -#include <linux/interrupt.h> -#include <linux/blkdev.h> -#include <linux/delay.h> -#include <linux/err.h> -#include <linux/dma-mapping.h> -#include <linux/clk.h> -#include <linux/atmel_pdc.h> - -#include <linux/mmc/host.h> - -#include <asm/io.h> -#include <asm/irq.h> -#include <asm/mach/mmc.h> -#include <asm/arch/board.h> -#include <asm/arch/cpu.h> -#include <asm/arch/gpio.h> -#include <asm/arch/at91_mci.h> - -#define DRIVER_NAME "at91_mci" - -#undef SUPPORT_4WIRE - -#define FL_SENT_COMMAND (1 << 0) -#define FL_SENT_STOP (1 << 1) - -#define AT91_MCI_ERRORS (AT91_MCI_RINDE | AT91_MCI_RDIRE | AT91_MCI_RCRCE \ - | AT91_MCI_RENDE | AT91_MCI_RTOE | AT91_MCI_DCRCE \ - | AT91_MCI_DTOE | AT91_MCI_OVRE | AT91_MCI_UNRE) - -#define at91_mci_read(host, reg) __raw_readl((host)->baseaddr + (reg)) -#define at91_mci_write(host, reg, val) __raw_writel((val), (host)->baseaddr + (reg)) - - -/* - * Low level type for this driver - */ -struct at91mci_host -{ - struct mmc_host *mmc; - struct mmc_command *cmd; - struct mmc_request *request; - - void __iomem *baseaddr; - int irq; - - struct at91_mmc_data *board; - int present; - - struct clk *mci_clk; - - /* - * Flag indicating when the command has been sent. This is used to - * work out whether or not to send the stop - */ - unsigned int flags; - /* flag for current bus settings */ - u32 bus_mode; - - /* DMA buffer used for transmitting */ - unsigned int* buffer; - dma_addr_t physical_address; - unsigned int total_length; - - /* Latest in the scatterlist that has been enabled for transfer, but not freed */ - int in_use_index; - - /* Latest in the scatterlist that has been enabled for transfer */ - int transfer_index; -}; - -/* - * Copy from sg to a dma block - used for transfers - */ -static inline void at91mci_sg_to_dma(struct at91mci_host *host, struct mmc_data *data) -{ - unsigned int len, i, size; - unsigned *dmabuf = host->buffer; - - size = host->total_length; - len = data->sg_len; - - /* - * Just loop through all entries. Size might not - * be the entire list though so make sure that - * we do not transfer too much. - */ - for (i = 0; i < len; i++) { - struct scatterlist *sg; - int amount; - unsigned int *sgbuffer; - - sg = &data->sg[i]; - - sgbuffer = kmap_atomic(sg->page, KM_BIO_SRC_IRQ) + sg->offset; - amount = min(size, sg->length); - size -= amount; - - if (cpu_is_at91rm9200()) { /* AT91RM9200 errata */ - int index; - - for (index = 0; index < (amount / 4); index++) - *dmabuf++ = swab32(sgbuffer[index]); - } - else - memcpy(dmabuf, sgbuffer, amount); - - kunmap_atomic(sgbuffer, KM_BIO_SRC_IRQ); - - if (size == 0) - break; - } - - /* - * Check that we didn't get a request to transfer - * more data than can fit into the SG list. - */ - BUG_ON(size != 0); -} - -/* - * Prepare a dma read - */ -static void at91mci_pre_dma_read(struct at91mci_host *host) -{ - int i; - struct scatterlist *sg; - struct mmc_command *cmd; - struct mmc_data *data; - - pr_debug("pre dma read\n"); - - cmd = host->cmd; - if (!cmd) { - pr_debug("no command\n"); - return; - } - - data = cmd->data; - if (!data) { - pr_debug("no data\n"); - return; - } - - for (i = 0; i < 2; i++) { - /* nothing left to transfer */ - if (host->transfer_index >= data->sg_len) { - pr_debug("Nothing left to transfer (index = %d)\n", host->transfer_index); - break; - } - - /* Check to see if this needs filling */ - if (i == 0) { - if (at91_mci_read(host, ATMEL_PDC_RCR) != 0) { - pr_debug("Transfer active in current\n"); - continue; - } - } - else { - if (at91_mci_read(host, ATMEL_PDC_RNCR) != 0) { - pr_debug("Transfer active in next\n"); - continue; - } - } - - /* Setup the next transfer */ - pr_debug("Using transfer index %d\n", host->transfer_index); - - sg = &data->sg[host->transfer_index++]; - pr_debug("sg = %p\n", sg); - - sg->dma_address = dma_map_page(NULL, sg->page, sg->offset, sg->length, DMA_FROM_DEVICE); - - pr_debug("dma address = %08X, length = %d\n", sg->dma_address, sg->length); - - if (i == 0) { - at91_mci_write(host, ATMEL_PDC_RPR, sg->dma_address); - at91_mci_write(host, ATMEL_PDC_RCR, sg->length / 4); - } - else { - at91_mci_write(host, ATMEL_PDC_RNPR, sg->dma_address); - at91_mci_write(host, ATMEL_PDC_RNCR, sg->length / 4); - } - } - - pr_debug("pre dma read done\n"); -} - -/* - * Handle after a dma read - */ -static void at91mci_post_dma_read(struct at91mci_host *host) -{ - struct mmc_command *cmd; - struct mmc_data *data; - - pr_debug("post dma read\n"); - - cmd = host->cmd; - if (!cmd) { - pr_debug("no command\n"); - return; - } - - data = cmd->data; - if (!data) { - pr_debug("no data\n"); - return; - } - - while (host->in_use_index < host->transfer_index) { - unsigned int *buffer; - - struct scatterlist *sg; - - pr_debug("finishing index %d\n", host->in_use_index); - - sg = &data->sg[host->in_use_index++]; - - pr_debug("Unmapping page %08X\n", sg->dma_address); - - dma_unmap_page(NULL, sg->dma_address, sg->length, DMA_FROM_DEVICE); - - /* Swap the contents of the buffer */ - buffer = kmap_atomic(sg->page, KM_BIO_SRC_IRQ) + sg->offset; - pr_debug("buffer = %p, length = %d\n", buffer, sg->length); - - data->bytes_xfered += sg->length; - - if (cpu_is_at91rm9200()) { /* AT91RM9200 errata */ - int index; - - for (index = 0; index < (sg->length / 4); index++) - buffer[index] = swab32(buffer[index]); - } - - kunmap_atomic(buffer, KM_BIO_SRC_IRQ); - flush_dcache_page(sg->page); - } - - /* Is there another transfer to trigger? */ - if (host->transfer_index < data->sg_len) - at91mci_pre_dma_read(host); - else { - at91_mci_write(host, AT91_MCI_IER, AT91_MCI_RXBUFF); - at91_mci_write(host, ATMEL_PDC_PTCR, ATMEL_PDC_RXTDIS | ATMEL_PDC_TXTDIS); - } - - pr_debug("post dma read done\n"); -} - -/* - * Handle transmitted data - */ -static void at91_mci_handle_transmitted(struct at91mci_host *host) -{ - struct mmc_command *cmd; - struct mmc_data *data; - - pr_debug("Handling the transmit\n"); - - /* Disable the transfer */ - at91_mci_write(host, ATMEL_PDC_PTCR, ATMEL_PDC_RXTDIS | ATMEL_PDC_TXTDIS); - - /* Now wait for cmd ready */ - at91_mci_write(host, AT91_MCI_IDR, AT91_MCI_TXBUFE); - at91_mci_write(host, AT91_MCI_IER, AT91_MCI_NOTBUSY); - - cmd = host->cmd; - if (!cmd) return; - - data = cmd->data; - if (!data) return; - - data->bytes_xfered = host->total_length; -} - -/* - * Enable the controller - */ -static void at91_mci_enable(struct at91mci_host *host) -{ - at91_mci_write(host, AT91_MCI_CR, AT91_MCI_MCIEN); - at91_mci_write(host, AT91_MCI_IDR, 0xffffffff); - at91_mci_write(host, AT91_MCI_DTOR, AT91_MCI_DTOMUL_1M | AT91_MCI_DTOCYC); - at91_mci_write(host, AT91_MCI_MR, AT91_MCI_PDCMODE | 0x34a); - - /* use Slot A or B (only one at same time) */ - at91_mci_write(host, AT91_MCI_SDCR, host->board->slot_b); -} - -/* - * Disable the controller - */ -static void at91_mci_disable(struct at91mci_host *host) -{ - at91_mci_write(host, AT91_MCI_CR, AT91_MCI_MCIDIS | AT91_MCI_SWRST); -} - -/* - * Send a command - * return the interrupts to enable - */ -static unsigned int at91_mci_send_command(struct at91mci_host *host, struct mmc_command *cmd) -{ - unsigned int cmdr, mr; - unsigned int block_length; - struct mmc_data *data = cmd->data; - - unsigned int blocks; - unsigned int ier = 0; - - host->cmd = cmd; - - /* Not sure if this is needed */ -#if 0 - if ((at91_mci_read(host, AT91_MCI_SR) & AT91_MCI_RTOE) && (cmd->opcode == 1)) { - pr_debug("Clearing timeout\n"); - at91_mci_write(host, AT91_MCI_ARGR, 0); - at91_mci_write(host, AT91_MCI_CMDR, AT91_MCI_OPDCMD); - while (!(at91_mci_read(host, AT91_MCI_SR) & AT91_MCI_CMDRDY)) { - /* spin */ - pr_debug("Clearing: SR = %08X\n", at91_mci_read(host, AT91_MCI_SR)); - } - } -#endif - cmdr = cmd->opcode; - - if (mmc_resp_type(cmd) == MMC_RSP_NONE) - cmdr |= AT91_MCI_RSPTYP_NONE; - else { - /* if a response is expected then allow maximum response latancy */ - cmdr |= AT91_MCI_MAXLAT; - /* set 136 bit response for R2, 48 bit response otherwise */ - if (mmc_resp_type(cmd) == MMC_RSP_R2) - cmdr |= AT91_MCI_RSPTYP_136; - else - cmdr |= AT91_MCI_RSPTYP_48; - } - - if (data) { - block_length = data->blksz; - blocks = data->blocks; - - /* always set data start - also set direction flag for read */ - if (data->flags & MMC_DATA_READ) - cmdr |= (AT91_MCI_TRDIR | AT91_MCI_TRCMD_START); - else if (data->flags & MMC_DATA_WRITE) - cmdr |= AT91_MCI_TRCMD_START; - - if (data->flags & MMC_DATA_STREAM) - cmdr |= AT91_MCI_TRTYP_STREAM; - if (data->flags & MMC_DATA_MULTI) - cmdr |= AT91_MCI_TRTYP_MULTIPLE; - } - else { - block_length = 0; - blocks = 0; - } - - if (cmd->opcode == MMC_STOP_TRANSMISSION) - cmdr |= AT91_MCI_TRCMD_STOP; - - if (host->bus_mode == MMC_BUSMODE_OPENDRAIN) - cmdr |= AT91_MCI_OPDCMD; - - /* - * Set the arguments and send the command - */ - pr_debug("Sending command %d as %08X, arg = %08X, blocks = %d, length = %d (MR = %08X)\n", - cmd->opcode, cmdr, cmd->arg, blocks, block_length, at91_mci_read(host, AT91_MCI_MR)); - - if (!data) { - at91_mci_write(host, ATMEL_PDC_PTCR, ATMEL_PDC_TXTDIS | ATMEL_PDC_RXTDIS); - at91_mci_write(host, ATMEL_PDC_RPR, 0); - at91_mci_write(host, ATMEL_PDC_RCR, 0); - at91_mci_write(host, ATMEL_PDC_RNPR, 0); - at91_mci_write(host, ATMEL_PDC_RNCR, 0); - at91_mci_write(host, ATMEL_PDC_TPR, 0); - at91_mci_write(host, ATMEL_PDC_TCR, 0); - at91_mci_write(host, ATMEL_PDC_TNPR, 0); - at91_mci_write(host, ATMEL_PDC_TNCR, 0); - - at91_mci_write(host, AT91_MCI_ARGR, cmd->arg); - at91_mci_write(host, AT91_MCI_CMDR, cmdr); - return AT91_MCI_CMDRDY; - } - - mr = at91_mci_read(host, AT91_MCI_MR) & 0x7fff; /* zero block length and PDC mode */ - at91_mci_write(host, AT91_MCI_MR, mr | (block_length << 16) | AT91_MCI_PDCMODE); - - /* - * Disable the PDC controller - */ - at91_mci_write(host, ATMEL_PDC_PTCR, ATMEL_PDC_RXTDIS | ATMEL_PDC_TXTDIS); - - if (cmdr & AT91_MCI_TRCMD_START) { - data->bytes_xfered = 0; - host->transfer_index = 0; - host->in_use_index = 0; - if (cmdr & AT91_MCI_TRDIR) { - /* - * Handle a read - */ - host->buffer = NULL; - host->total_length = 0; - - at91mci_pre_dma_read(host); - ier = AT91_MCI_ENDRX /* | AT91_MCI_RXBUFF */; - } - else { - /* - * Handle a write - */ - host->total_length = block_length * blocks; - host->buffer = dma_alloc_coherent(NULL, - host->total_length, - &host->physical_address, GFP_KERNEL); - - at91mci_sg_to_dma(host, data); - - pr_debug("Transmitting %d bytes\n", host->total_length); - - at91_mci_write(host, ATMEL_PDC_TPR, host->physical_address); - at91_mci_write(host, ATMEL_PDC_TCR, host->total_length / 4); - ier = AT91_MCI_TXBUFE; - } - } - - /* - * Send the command and then enable the PDC - not the other way round as - * the data sheet says - */ - - at91_mci_write(host, AT91_MCI_ARGR, cmd->arg); - at91_mci_write(host, AT91_MCI_CMDR, cmdr); - - if (cmdr & AT91_MCI_TRCMD_START) { - if (cmdr & AT91_MCI_TRDIR) - at91_mci_write(host, ATMEL_PDC_PTCR, ATMEL_PDC_RXTEN); - else - at91_mci_write(host, ATMEL_PDC_PTCR, ATMEL_PDC_TXTEN); - } - return ier; -} - -/* - * Wait for a command to complete - */ -static void at91mci_process_command(struct at91mci_host *host, struct mmc_command *cmd) -{ - unsigned int ier; - - ier = at91_mci_send_command(host, cmd); - - pr_debug("setting ier to %08X\n", ier); - - /* Stop on errors or the required value */ - at91_mci_write(host, AT91_MCI_IER, AT91_MCI_ERRORS | ier); -} - -/* - * Process the next step in the request - */ -static void at91mci_process_next(struct at91mci_host *host) -{ - if (!(host->flags & FL_SENT_COMMAND)) { - host->flags |= FL_SENT_COMMAND; - at91mci_process_command(host, host->request->cmd); - } - else if ((!(host->flags & FL_SENT_STOP)) && host->request->stop) { - host->flags |= FL_SENT_STOP; - at91mci_process_command(host, host->request->stop); - } - else - mmc_request_done(host->mmc, host->request); -} - -/* - * Handle a command that has been completed - */ -static void at91mci_completed_command(struct at91mci_host *host) -{ - struct mmc_command *cmd = host->cmd; - unsigned int status; - - at91_mci_write(host, AT91_MCI_IDR, 0xffffffff); - - cmd->resp[0] = at91_mci_read(host, AT91_MCI_RSPR(0)); - cmd->resp[1] = at91_mci_read(host, AT91_MCI_RSPR(1)); - cmd->resp[2] = at91_mci_read(host, AT91_MCI_RSPR(2)); - cmd->resp[3] = at91_mci_read(host, AT91_MCI_RSPR(3)); - - if (host->buffer) { - dma_free_coherent(NULL, host->total_length, host->buffer, host->physical_address); - host->buffer = NULL; - } - - status = at91_mci_read(host, AT91_MCI_SR); - - pr_debug("Status = %08X [%08X %08X %08X %08X]\n", - status, cmd->resp[0], cmd->resp[1], cmd->resp[2], cmd->resp[3]); - - if (status & (AT91_MCI_RINDE | AT91_MCI_RDIRE | AT91_MCI_RCRCE | - AT91_MCI_RENDE | AT91_MCI_RTOE | AT91_MCI_DCRCE | - AT91_MCI_DTOE | AT91_MCI_OVRE | AT91_MCI_UNRE)) { - if ((status & AT91_MCI_RCRCE) && - ((cmd->opcode == MMC_SEND_OP_COND) || (cmd->opcode == SD_APP_OP_COND))) { - cmd->error = MMC_ERR_NONE; - } - else { - if (status & (AT91_MCI_RTOE | AT91_MCI_DTOE)) - cmd->error = MMC_ERR_TIMEOUT; - else if (status & (AT91_MCI_RCRCE | AT91_MCI_DCRCE)) - cmd->error = MMC_ERR_BADCRC; - else if (status & (AT91_MCI_OVRE | AT91_MCI_UNRE)) - cmd->error = MMC_ERR_FIFO; - else - cmd->error = MMC_ERR_FAILED; - - pr_debug("Error detected and set to %d (cmd = %d, retries = %d)\n", - cmd->error, cmd->opcode, cmd->retries); - } - } - else - cmd->error = MMC_ERR_NONE; - - at91mci_process_next(host); -} - -/* - * Handle an MMC request - */ -static void at91_mci_request(struct mmc_host *mmc, struct mmc_request *mrq) -{ - struct at91mci_host *host = mmc_priv(mmc); - host->request = mrq; - host->flags = 0; - - at91mci_process_next(host); -} - -/* - * Set the IOS - */ -static void at91_mci_set_ios(struct mmc_host *mmc, struct mmc_ios *ios) -{ - int clkdiv; - struct at91mci_host *host = mmc_priv(mmc); - unsigned long at91_master_clock = clk_get_rate(host->mci_clk); - - host->bus_mode = ios->bus_mode; - - if (ios->clock == 0) { - /* Disable the MCI controller */ - at91_mci_write(host, AT91_MCI_CR, AT91_MCI_MCIDIS); - clkdiv = 0; - } - else { - /* Enable the MCI controller */ - at91_mci_write(host, AT91_MCI_CR, AT91_MCI_MCIEN); - - if ((at91_master_clock % (ios->clock * 2)) == 0) - clkdiv = ((at91_master_clock / ios->clock) / 2) - 1; - else - clkdiv = (at91_master_clock / ios->clock) / 2; - - pr_debug("clkdiv = %d. mcck = %ld\n", clkdiv, - at91_master_clock / (2 * (clkdiv + 1))); - } - if (ios->bus_width == MMC_BUS_WIDTH_4 && host->board->wire4) { - pr_debug("MMC: Setting controller bus width to 4\n"); - at91_mci_write(host, AT91_MCI_SDCR, at91_mci_read(host, AT91_MCI_SDCR) | AT91_MCI_SDCBUS); - } - else { - pr_debug("MMC: Setting controller bus width to 1\n"); - at91_mci_write(host, AT91_MCI_SDCR, at91_mci_read(host, AT91_MCI_SDCR) & ~AT91_MCI_SDCBUS); - } - - /* Set the clock divider */ - at91_mci_write(host, AT91_MCI_MR, (at91_mci_read(host, AT91_MCI_MR) & ~AT91_MCI_CLKDIV) | clkdiv); - - /* maybe switch power to the card */ - if (host->board->vcc_pin) { - switch (ios->power_mode) { - case MMC_POWER_OFF: - at91_set_gpio_value(host->board->vcc_pin, 0); - break; - case MMC_POWER_UP: - case MMC_POWER_ON: - at91_set_gpio_value(host->board->vcc_pin, 1); - break; - } - } -} - -/* - * Handle an interrupt - */ -static irqreturn_t at91_mci_irq(int irq, void *devid) -{ - struct at91mci_host *host = devid; - int completed = 0; - unsigned int int_status, int_mask; - - int_status = at91_mci_read(host, AT91_MCI_SR); - int_mask = at91_mci_read(host, AT91_MCI_IMR); - - pr_debug("MCI irq: status = %08X, %08X, %08X\n", int_status, int_mask, - int_status & int_mask); - - int_status = int_status & int_mask; - - if (int_status & AT91_MCI_ERRORS) { - completed = 1; - - if (int_status & AT91_MCI_UNRE) - pr_debug("MMC: Underrun error\n"); - if (int_status & AT91_MCI_OVRE) - pr_debug("MMC: Overrun error\n"); - if (int_status & AT91_MCI_DTOE) - pr_debug("MMC: Data timeout\n"); - if (int_status & AT91_MCI_DCRCE) - pr_debug("MMC: CRC error in data\n"); - if (int_status & AT91_MCI_RTOE) - pr_debug("MMC: Response timeout\n"); - if (int_status & AT91_MCI_RENDE) - pr_debug("MMC: Response end bit error\n"); - if (int_status & AT91_MCI_RCRCE) - pr_debug("MMC: Response CRC error\n"); - if (int_status & AT91_MCI_RDIRE) - pr_debug("MMC: Response direction error\n"); - if (int_status & AT91_MCI_RINDE) - pr_debug("MMC: Response index error\n"); - } else { - /* Only continue processing if no errors */ - - if (int_status & AT91_MCI_TXBUFE) { - pr_debug("TX buffer empty\n"); - at91_mci_handle_transmitted(host); - } - - if (int_status & AT91_MCI_RXBUFF) { - pr_debug("RX buffer full\n"); - at91_mci_write(host, AT91_MCI_IER, AT91_MCI_CMDRDY); - } - - if (int_status & AT91_MCI_ENDTX) - pr_debug("Transmit has ended\n"); - - if (int_status & AT91_MCI_ENDRX) { - pr_debug("Receive has ended\n"); - at91mci_post_dma_read(host); - } - - if (int_status & AT91_MCI_NOTBUSY) { - pr_debug("Card is ready\n"); - at91_mci_write(host, AT91_MCI_IER, AT91_MCI_CMDRDY); - } - - if (int_status & AT91_MCI_DTIP) - pr_debug("Data transfer in progress\n"); - - if (int_status & AT91_MCI_BLKE) - pr_debug("Block transfer has ended\n"); - - if (int_status & AT91_MCI_TXRDY) - pr_debug("Ready to transmit\n"); - - if (int_status & AT91_MCI_RXRDY) - pr_debug("Ready to receive\n"); - - if (int_status & AT91_MCI_CMDRDY) { - pr_debug("Command ready\n"); - completed = 1; - } - } - - if (completed) { - pr_debug("Completed command\n"); - at91_mci_write(host, AT91_MCI_IDR, 0xffffffff); - at91mci_completed_command(host); - } else - at91_mci_write(host, AT91_MCI_IDR, int_status); - - return IRQ_HANDLED; -} - -static irqreturn_t at91_mmc_det_irq(int irq, void *_host) -{ - struct at91mci_host *host = _host; - int present = !at91_get_gpio_value(irq); - - /* - * we expect this irq on both insert and remove, - * and use a short delay to debounce. - */ - if (present != host->present) { - host->present = present; - pr_debug("%s: card %s\n", mmc_hostname(host->mmc), - present ? "insert" : "remove"); - if (!present) { - pr_debug("****** Resetting SD-card bus width ******\n"); - at91_mci_write(host, AT91_MCI_SDCR, at91_mci_read(host, AT91_MCI_SDCR) & ~AT91_MCI_SDCBUS); - } - mmc_detect_change(host->mmc, msecs_to_jiffies(100)); - } - return IRQ_HANDLED; -} - -static int at91_mci_get_ro(struct mmc_host *mmc) -{ - int read_only = 0; - struct at91mci_host *host = mmc_priv(mmc); - - if (host->board->wp_pin) { - read_only = at91_get_gpio_value(host->board->wp_pin); - printk(KERN_WARNING "%s: card is %s\n", mmc_hostname(mmc), - (read_only ? "read-only" : "read-write") ); - } - else { - printk(KERN_WARNING "%s: host does not support reading read-only " - "switch. Assuming write-enable.\n", mmc_hostname(mmc)); - } - return read_only; -} - -static const struct mmc_host_ops at91_mci_ops = { - .request = at91_mci_request, - .set_ios = at91_mci_set_ios, - .get_ro = at91_mci_get_ro, -}; - -/* - * Probe for the device - */ -static int __init at91_mci_probe(struct platform_device *pdev) -{ - struct mmc_host *mmc; - struct at91mci_host *host; - struct resource *res; - int ret; - - pr_debug("Probe MCI devices\n"); - - res = platform_get_resource(pdev, IORESOURCE_MEM, 0); - if (!res) - return -ENXIO; - - if (!request_mem_region(res->start, res->end - res->start + 1, DRIVER_NAME)) - return -EBUSY; - - mmc = mmc_alloc_host(sizeof(struct at91mci_host), &pdev->dev); - if (!mmc) { - pr_debug("Failed to allocate mmc host\n"); - release_mem_region(res->start, res->end - res->start + 1); - return -ENOMEM; - } - - mmc->ops = &at91_mci_ops; - mmc->f_min = 375000; - mmc->f_max = 25000000; - mmc->ocr_avail = MMC_VDD_32_33 | MMC_VDD_33_34; - mmc->caps = MMC_CAP_BYTEBLOCK; - - mmc->max_blk_size = 4095; - mmc->max_blk_count = mmc->max_req_size; - - host = mmc_priv(mmc); - host->mmc = mmc; - host->buffer = NULL; - host->bus_mode = 0; - host->board = pdev->dev.platform_data; - if (host->board->wire4) { -#ifdef SUPPORT_4WIRE - mmc->caps |= MMC_CAP_4_BIT_DATA; -#else - printk("AT91 MMC: 4 wire bus mode not supported by this driver - using 1 wire\n"); -#endif - } - - /* - * Get Clock - */ - host->mci_clk = clk_get(&pdev->dev, "mci_clk"); - if (IS_ERR(host->mci_clk)) { - printk(KERN_ERR "AT91 MMC: no clock defined.\n"); - mmc_free_host(mmc); - release_mem_region(res->start, res->end - res->start + 1); - return -ENODEV; - } - - /* - * Map I/O region - */ - host->baseaddr = ioremap(res->start, res->end - res->start + 1); - if (!host->baseaddr) { - clk_put(host->mci_clk); - mmc_free_host(mmc); - release_mem_region(res->start, res->end - res->start + 1); - return -ENOMEM; - } - - /* - * Reset hardware - */ - clk_enable(host->mci_clk); /* Enable the peripheral clock */ - at91_mci_disable(host); - at91_mci_enable(host); - - /* - * Allocate the MCI interrupt - */ - host->irq = platform_get_irq(pdev, 0); - ret = request_irq(host->irq, at91_mci_irq, IRQF_SHARED, DRIVER_NAME, host); - if (ret) { - printk(KERN_ERR "AT91 MMC: Failed to request MCI interrupt\n"); - clk_disable(host->mci_clk); - clk_put(host->mci_clk); - mmc_free_host(mmc); - iounmap(host->baseaddr); - release_mem_region(res->start, res->end - res->start + 1); - return ret; - } - - platform_set_drvdata(pdev, mmc); - - /* - * Add host to MMC layer - */ - if (host->board->det_pin) - host->present = !at91_get_gpio_value(host->board->det_pin); - else - host->present = -1; - - mmc_add_host(mmc); - - /* - * monitor card insertion/removal if we can - */ - if (host->board->det_pin) { - ret = request_irq(host->board->det_pin, at91_mmc_det_irq, - 0, DRIVER_NAME, host); - if (ret) - printk(KERN_ERR "AT91 MMC: Couldn't allocate MMC detect irq\n"); - } - - pr_debug("Added MCI driver\n"); - - return 0; -} - -/* - * Remove a device - */ -static int __exit at91_mci_remove(struct platform_device *pdev) -{ - struct mmc_host *mmc = platform_get_drvdata(pdev); - struct at91mci_host *host; - struct resource *res; - - if (!mmc) - return -1; - - host = mmc_priv(mmc); - - if (host->present != -1) { - free_irq(host->board->det_pin, host); - cancel_delayed_work(&host->mmc->detect); - } - - at91_mci_disable(host); - mmc_remove_host(mmc); - free_irq(host->irq, host); - - clk_disable(host->mci_clk); /* Disable the peripheral clock */ - clk_put(host->mci_clk); - - iounmap(host->baseaddr); - res = platform_get_resource(pdev, IORESOURCE_MEM, 0); - release_mem_region(res->start, res->end - res->start + 1); - - mmc_free_host(mmc); - platform_set_drvdata(pdev, NULL); - pr_debug("MCI Removed\n"); - - return 0; -} - -#ifdef CONFIG_PM -static int at91_mci_suspend(struct platform_device *pdev, pm_message_t state) -{ - struct mmc_host *mmc = platform_get_drvdata(pdev); - int ret = 0; - - if (mmc) - ret = mmc_suspend_host(mmc, state); - - return ret; -} - -static int at91_mci_resume(struct platform_device *pdev) -{ - struct mmc_host *mmc = platform_get_drvdata(pdev); - int ret = 0; - - if (mmc) - ret = mmc_resume_host(mmc); - - return ret; -} -#else -#define at91_mci_suspend NULL -#define at91_mci_resume NULL -#endif - -static struct platform_driver at91_mci_driver = { - .remove = __exit_p(at91_mci_remove), - .suspend = at91_mci_suspend, - .resume = at91_mci_resume, - .driver = { - .name = DRIVER_NAME, - .owner = THIS_MODULE, - }, -}; - -static int __init at91_mci_init(void) -{ - return platform_driver_probe(&at91_mci_driver, at91_mci_probe); -} - -static void __exit at91_mci_exit(void) -{ - platform_driver_unregister(&at91_mci_driver); -} - -module_init(at91_mci_init); -module_exit(at91_mci_exit); - -MODULE_DESCRIPTION("AT91 Multimedia Card Interface driver"); -MODULE_AUTHOR("Nick Randell"); -MODULE_LICENSE("GPL"); |