diff options
Diffstat (limited to 'drivers/mmc/host/jz4740_mmc.c')
| -rw-r--r-- | drivers/mmc/host/jz4740_mmc.c | 1029 |
1 files changed, 1029 insertions, 0 deletions
diff --git a/drivers/mmc/host/jz4740_mmc.c b/drivers/mmc/host/jz4740_mmc.c new file mode 100644 index 0000000..ad4f987 --- /dev/null +++ b/drivers/mmc/host/jz4740_mmc.c @@ -0,0 +1,1029 @@ +/* + * Copyright (C) 2009-2010, Lars-Peter Clausen <lars@metafoo.de> + * JZ4740 SD/MMC controller driver + * + * This program is free software; you can redistribute it and/or modify it + * under the terms of the GNU General Public License as published by the + * Free Software Foundation; either version 2 of the License, or (at your + * option) any later version. + * + * You should have received a copy of the GNU General Public License along + * with this program; if not, write to the Free Software Foundation, Inc., + * 675 Mass Ave, Cambridge, MA 02139, USA. + * + */ + +#include <linux/mmc/host.h> +#include <linux/io.h> +#include <linux/irq.h> +#include <linux/interrupt.h> +#include <linux/module.h> +#include <linux/platform_device.h> +#include <linux/delay.h> +#include <linux/scatterlist.h> +#include <linux/clk.h> + +#include <linux/bitops.h> +#include <linux/gpio.h> +#include <asm/mach-jz4740/gpio.h> +#include <asm/cacheflush.h> +#include <linux/dma-mapping.h> + +#include <asm/mach-jz4740/jz4740_mmc.h> + +#define JZ_REG_MMC_STRPCL 0x00 +#define JZ_REG_MMC_STATUS 0x04 +#define JZ_REG_MMC_CLKRT 0x08 +#define JZ_REG_MMC_CMDAT 0x0C +#define JZ_REG_MMC_RESTO 0x10 +#define JZ_REG_MMC_RDTO 0x14 +#define JZ_REG_MMC_BLKLEN 0x18 +#define JZ_REG_MMC_NOB 0x1C +#define JZ_REG_MMC_SNOB 0x20 +#define JZ_REG_MMC_IMASK 0x24 +#define JZ_REG_MMC_IREG 0x28 +#define JZ_REG_MMC_CMD 0x2C +#define JZ_REG_MMC_ARG 0x30 +#define JZ_REG_MMC_RESP_FIFO 0x34 +#define JZ_REG_MMC_RXFIFO 0x38 +#define JZ_REG_MMC_TXFIFO 0x3C + +#define JZ_MMC_STRPCL_EXIT_MULTIPLE BIT(7) +#define JZ_MMC_STRPCL_EXIT_TRANSFER BIT(6) +#define JZ_MMC_STRPCL_START_READWAIT BIT(5) +#define JZ_MMC_STRPCL_STOP_READWAIT BIT(4) +#define JZ_MMC_STRPCL_RESET BIT(3) +#define JZ_MMC_STRPCL_START_OP BIT(2) +#define JZ_MMC_STRPCL_CLOCK_CONTROL (BIT(1) | BIT(0)) +#define JZ_MMC_STRPCL_CLOCK_STOP BIT(0) +#define JZ_MMC_STRPCL_CLOCK_START BIT(1) + + +#define JZ_MMC_STATUS_IS_RESETTING BIT(15) +#define JZ_MMC_STATUS_SDIO_INT_ACTIVE BIT(14) +#define JZ_MMC_STATUS_PRG_DONE BIT(13) +#define JZ_MMC_STATUS_DATA_TRAN_DONE BIT(12) +#define JZ_MMC_STATUS_END_CMD_RES BIT(11) +#define JZ_MMC_STATUS_DATA_FIFO_AFULL BIT(10) +#define JZ_MMC_STATUS_IS_READWAIT BIT(9) +#define JZ_MMC_STATUS_CLK_EN BIT(8) +#define JZ_MMC_STATUS_DATA_FIFO_FULL BIT(7) +#define JZ_MMC_STATUS_DATA_FIFO_EMPTY BIT(6) +#define JZ_MMC_STATUS_CRC_RES_ERR BIT(5) +#define JZ_MMC_STATUS_CRC_READ_ERROR BIT(4) +#define JZ_MMC_STATUS_TIMEOUT_WRITE BIT(3) +#define JZ_MMC_STATUS_CRC_WRITE_ERROR BIT(2) +#define JZ_MMC_STATUS_TIMEOUT_RES BIT(1) +#define JZ_MMC_STATUS_TIMEOUT_READ BIT(0) + +#define JZ_MMC_STATUS_READ_ERROR_MASK (BIT(4) | BIT(0)) +#define JZ_MMC_STATUS_WRITE_ERROR_MASK (BIT(3) | BIT(2)) + + +#define JZ_MMC_CMDAT_IO_ABORT BIT(11) +#define JZ_MMC_CMDAT_BUS_WIDTH_4BIT BIT(10) +#define JZ_MMC_CMDAT_DMA_EN BIT(8) +#define JZ_MMC_CMDAT_INIT BIT(7) +#define JZ_MMC_CMDAT_BUSY BIT(6) +#define JZ_MMC_CMDAT_STREAM BIT(5) +#define JZ_MMC_CMDAT_WRITE BIT(4) +#define JZ_MMC_CMDAT_DATA_EN BIT(3) +#define JZ_MMC_CMDAT_RESPONSE_FORMAT (BIT(2) | BIT(1) | BIT(0)) +#define JZ_MMC_CMDAT_RSP_R1 1 +#define JZ_MMC_CMDAT_RSP_R2 2 +#define JZ_MMC_CMDAT_RSP_R3 3 + +#define JZ_MMC_IRQ_SDIO BIT(7) +#define JZ_MMC_IRQ_TXFIFO_WR_REQ BIT(6) +#define JZ_MMC_IRQ_RXFIFO_RD_REQ BIT(5) +#define JZ_MMC_IRQ_END_CMD_RES BIT(2) +#define JZ_MMC_IRQ_PRG_DONE BIT(1) +#define JZ_MMC_IRQ_DATA_TRAN_DONE BIT(0) + + +#define JZ_MMC_CLK_RATE 24000000 + +enum jz4740_mmc_state { + JZ4740_MMC_STATE_READ_RESPONSE, + JZ4740_MMC_STATE_TRANSFER_DATA, + JZ4740_MMC_STATE_SEND_STOP, + JZ4740_MMC_STATE_DONE, +}; + +struct jz4740_mmc_host { + struct mmc_host *mmc; + struct platform_device *pdev; + struct jz4740_mmc_platform_data *pdata; + struct clk *clk; + + int irq; + int card_detect_irq; + + struct resource *mem; + void __iomem *base; + struct mmc_request *req; + struct mmc_command *cmd; + + unsigned long waiting; + + uint32_t cmdat; + + uint16_t irq_mask; + + spinlock_t lock; + + struct timer_list timeout_timer; + struct sg_mapping_iter miter; + enum jz4740_mmc_state state; +}; + +static void jz4740_mmc_set_irq_enabled(struct jz4740_mmc_host *host, + unsigned int irq, bool enabled) +{ + unsigned long flags; + + spin_lock_irqsave(&host->lock, flags); + if (enabled) + host->irq_mask &= ~irq; + else + host->irq_mask |= irq; + spin_unlock_irqrestore(&host->lock, flags); + + writew(host->irq_mask, host->base + JZ_REG_MMC_IMASK); +} + +static void jz4740_mmc_clock_enable(struct jz4740_mmc_host *host, + bool start_transfer) +{ + uint16_t val = JZ_MMC_STRPCL_CLOCK_START; + + if (start_transfer) + val |= JZ_MMC_STRPCL_START_OP; + + writew(val, host->base + JZ_REG_MMC_STRPCL); +} + +static void jz4740_mmc_clock_disable(struct jz4740_mmc_host *host) +{ + uint32_t status; + unsigned int timeout = 1000; + + writew(JZ_MMC_STRPCL_CLOCK_STOP, host->base + JZ_REG_MMC_STRPCL); + do { + status = readl(host->base + JZ_REG_MMC_STATUS); + } while (status & JZ_MMC_STATUS_CLK_EN && --timeout); +} + +static void jz4740_mmc_reset(struct jz4740_mmc_host *host) +{ + uint32_t status; + unsigned int timeout = 1000; + + writew(JZ_MMC_STRPCL_RESET, host->base + JZ_REG_MMC_STRPCL); + udelay(10); + do { + status = readl(host->base + JZ_REG_MMC_STATUS); + } while (status & JZ_MMC_STATUS_IS_RESETTING && --timeout); +} + +static void jz4740_mmc_request_done(struct jz4740_mmc_host *host) +{ + struct mmc_request *req; + + req = host->req; + host->req = NULL; + + mmc_request_done(host->mmc, req); +} + +static unsigned int jz4740_mmc_poll_irq(struct jz4740_mmc_host *host, + unsigned int irq) +{ + unsigned int timeout = 0x800; + uint16_t status; + + do { + status = readw(host->base + JZ_REG_MMC_IREG); + } while (!(status & irq) && --timeout); + + if (timeout == 0) { + set_bit(0, &host->waiting); + mod_timer(&host->timeout_timer, jiffies + 5*HZ); + jz4740_mmc_set_irq_enabled(host, irq, true); + return true; + } + + return false; +} + +static void jz4740_mmc_transfer_check_state(struct jz4740_mmc_host *host, + struct mmc_data *data) +{ + int status; + + status = readl(host->base + JZ_REG_MMC_STATUS); + if (status & JZ_MMC_STATUS_WRITE_ERROR_MASK) { + if (status & (JZ_MMC_STATUS_TIMEOUT_WRITE)) { + host->req->cmd->error = -ETIMEDOUT; + data->error = -ETIMEDOUT; + } else { + host->req->cmd->error = -EIO; + data->error = -EIO; + } + } +} + +static bool jz4740_mmc_write_data(struct jz4740_mmc_host *host, + struct mmc_data *data) +{ + struct sg_mapping_iter *miter = &host->miter; + void __iomem *fifo_addr = host->base + JZ_REG_MMC_TXFIFO; + uint32_t *buf; + bool timeout; + size_t i, j; + + while (sg_miter_next(miter)) { + buf = miter->addr; + i = miter->length / 4; + j = i / 8; + i = i & 0x7; + while (j) { + timeout = jz4740_mmc_poll_irq(host, JZ_MMC_IRQ_TXFIFO_WR_REQ); + if (unlikely(timeout)) + goto poll_timeout; + + writel(buf[0], fifo_addr); + writel(buf[1], fifo_addr); + writel(buf[2], fifo_addr); + writel(buf[3], fifo_addr); + writel(buf[4], fifo_addr); + writel(buf[5], fifo_addr); + writel(buf[6], fifo_addr); + writel(buf[7], fifo_addr); + buf += 8; + --j; + } + if (unlikely(i)) { + timeout = jz4740_mmc_poll_irq(host, JZ_MMC_IRQ_TXFIFO_WR_REQ); + if (unlikely(timeout)) + goto poll_timeout; + + while (i) { + writel(*buf, fifo_addr); + ++buf; + --i; + } + } + data->bytes_xfered += miter->length; + } + sg_miter_stop(miter); + + return false; + +poll_timeout: + miter->consumed = (void *)buf - miter->addr; + data->bytes_xfered += miter->consumed; + sg_miter_stop(miter); + + return true; +} + +static bool jz4740_mmc_read_data(struct jz4740_mmc_host *host, + struct mmc_data *data) +{ + struct sg_mapping_iter *miter = &host->miter; + void __iomem *fifo_addr = host->base + JZ_REG_MMC_RXFIFO; + uint32_t *buf; + uint32_t d; + uint16_t status; + size_t i, j; + unsigned int timeout; + + while (sg_miter_next(miter)) { + buf = miter->addr; + i = miter->length; + j = i / 32; + i = i & 0x1f; + while (j) { + timeout = jz4740_mmc_poll_irq(host, JZ_MMC_IRQ_RXFIFO_RD_REQ); + if (unlikely(timeout)) + goto poll_timeout; + + buf[0] = readl(fifo_addr); + buf[1] = readl(fifo_addr); + buf[2] = readl(fifo_addr); + buf[3] = readl(fifo_addr); + buf[4] = readl(fifo_addr); + buf[5] = readl(fifo_addr); + buf[6] = readl(fifo_addr); + buf[7] = readl(fifo_addr); + + buf += 8; + --j; + } + + if (unlikely(i)) { + timeout = jz4740_mmc_poll_irq(host, JZ_MMC_IRQ_RXFIFO_RD_REQ); + if (unlikely(timeout)) + goto poll_timeout; + + while (i >= 4) { + *buf++ = readl(fifo_addr); + i -= 4; + } + if (unlikely(i > 0)) { + d = readl(fifo_addr); + memcpy(buf, &d, i); + } + } + data->bytes_xfered += miter->length; + + /* This can go away once MIPS implements + * flush_kernel_dcache_page */ + flush_dcache_page(miter->page); + } + sg_miter_stop(miter); + + /* For whatever reason there is sometime one word more in the fifo then + * requested */ + timeout = 1000; + status = readl(host->base + JZ_REG_MMC_STATUS); + while (!(status & JZ_MMC_STATUS_DATA_FIFO_EMPTY) && --timeout) { + d = readl(fifo_addr); + status = readl(host->base + JZ_REG_MMC_STATUS); + } + + return false; + +poll_timeout: + miter->consumed = (void *)buf - miter->addr; + data->bytes_xfered += miter->consumed; + sg_miter_stop(miter); + + return true; +} + +static void jz4740_mmc_timeout(unsigned long data) +{ + struct jz4740_mmc_host *host = (struct jz4740_mmc_host *)data; + + if (!test_and_clear_bit(0, &host->waiting)) + return; + + jz4740_mmc_set_irq_enabled(host, JZ_MMC_IRQ_END_CMD_RES, false); + + host->req->cmd->error = -ETIMEDOUT; + jz4740_mmc_request_done(host); +} + +static void jz4740_mmc_read_response(struct jz4740_mmc_host *host, + struct mmc_command *cmd) +{ + int i; + uint16_t tmp; + void __iomem *fifo_addr = host->base + JZ_REG_MMC_RESP_FIFO; + + if (cmd->flags & MMC_RSP_136) { + tmp = readw(fifo_addr); + for (i = 0; i < 4; ++i) { + cmd->resp[i] = tmp << 24; + tmp = readw(fifo_addr); + cmd->resp[i] |= tmp << 8; + tmp = readw(fifo_addr); + cmd->resp[i] |= tmp >> 8; + } + } else { + cmd->resp[0] = readw(fifo_addr) << 24; + cmd->resp[0] |= readw(fifo_addr) << 8; + cmd->resp[0] |= readw(fifo_addr) & 0xff; + } +} + +static void jz4740_mmc_send_command(struct jz4740_mmc_host *host, + struct mmc_command *cmd) +{ + uint32_t cmdat = host->cmdat; + + host->cmdat &= ~JZ_MMC_CMDAT_INIT; + jz4740_mmc_clock_disable(host); + + host->cmd = cmd; + + if (cmd->flags & MMC_RSP_BUSY) + cmdat |= JZ_MMC_CMDAT_BUSY; + + switch (mmc_resp_type(cmd)) { + case MMC_RSP_R1B: + case MMC_RSP_R1: + cmdat |= JZ_MMC_CMDAT_RSP_R1; + break; + case MMC_RSP_R2: + cmdat |= JZ_MMC_CMDAT_RSP_R2; + break; + case MMC_RSP_R3: + cmdat |= JZ_MMC_CMDAT_RSP_R3; + break; + default: + break; + } + + if (cmd->data) { + cmdat |= JZ_MMC_CMDAT_DATA_EN; + if (cmd->data->flags & MMC_DATA_WRITE) + cmdat |= JZ_MMC_CMDAT_WRITE; + if (cmd->data->flags & MMC_DATA_STREAM) + cmdat |= JZ_MMC_CMDAT_STREAM; + + writew(cmd->data->blksz, host->base + JZ_REG_MMC_BLKLEN); + writew(cmd->data->blocks, host->base + JZ_REG_MMC_NOB); + } + + writeb(cmd->opcode, host->base + JZ_REG_MMC_CMD); + writel(cmd->arg, host->base + JZ_REG_MMC_ARG); + writel(cmdat, host->base + JZ_REG_MMC_CMDAT); + + jz4740_mmc_clock_enable(host, 1); +} + +static void jz_mmc_prepare_data_transfer(struct jz4740_mmc_host *host) +{ + struct mmc_command *cmd = host->req->cmd; + struct mmc_data *data = cmd->data; + int direction; + + if (data->flags & MMC_DATA_READ) + direction = SG_MITER_TO_SG; + else + direction = SG_MITER_FROM_SG; + + sg_miter_start(&host->miter, data->sg, data->sg_len, direction); +} + + +static irqreturn_t jz_mmc_irq_worker(int irq, void *devid) +{ + struct jz4740_mmc_host *host = (struct jz4740_mmc_host *)devid; + struct mmc_command *cmd = host->req->cmd; + struct mmc_request *req = host->req; + bool timeout = false; + + if (cmd->error) + host->state = JZ4740_MMC_STATE_DONE; + + switch (host->state) { + case JZ4740_MMC_STATE_READ_RESPONSE: + if (cmd->flags & MMC_RSP_PRESENT) + jz4740_mmc_read_response(host, cmd); + + if (!cmd->data) + break; + + jz_mmc_prepare_data_transfer(host); + + case JZ4740_MMC_STATE_TRANSFER_DATA: + if (cmd->data->flags & MMC_DATA_READ) + timeout = jz4740_mmc_read_data(host, cmd->data); + else + timeout = jz4740_mmc_write_data(host, cmd->data); + + if (unlikely(timeout)) { + host->state = JZ4740_MMC_STATE_TRANSFER_DATA; + break; + } + + jz4740_mmc_transfer_check_state(host, cmd->data); + + timeout = jz4740_mmc_poll_irq(host, JZ_MMC_IRQ_DATA_TRAN_DONE); + if (unlikely(timeout)) { + host->state = JZ4740_MMC_STATE_SEND_STOP; + break; + } + writew(JZ_MMC_IRQ_DATA_TRAN_DONE, host->base + JZ_REG_MMC_IREG); + + case JZ4740_MMC_STATE_SEND_STOP: + if (!req->stop) + break; + + jz4740_mmc_send_command(host, req->stop); + + timeout = jz4740_mmc_poll_irq(host, JZ_MMC_IRQ_PRG_DONE); + if (timeout) { + host->state = JZ4740_MMC_STATE_DONE; + break; + } + case JZ4740_MMC_STATE_DONE: + break; + } + + if (!timeout) + jz4740_mmc_request_done(host); + + return IRQ_HANDLED; +} + +static irqreturn_t jz_mmc_irq(int irq, void *devid) +{ + struct jz4740_mmc_host *host = devid; + struct mmc_command *cmd = host->cmd; + uint16_t irq_reg, status, tmp; + + irq_reg = readw(host->base + JZ_REG_MMC_IREG); + + tmp = irq_reg; + irq_reg &= ~host->irq_mask; + + tmp &= ~(JZ_MMC_IRQ_TXFIFO_WR_REQ | JZ_MMC_IRQ_RXFIFO_RD_REQ | + JZ_MMC_IRQ_PRG_DONE | JZ_MMC_IRQ_DATA_TRAN_DONE); + + if (tmp != irq_reg) + writew(tmp & ~irq_reg, host->base + JZ_REG_MMC_IREG); + + if (irq_reg & JZ_MMC_IRQ_SDIO) { + writew(JZ_MMC_IRQ_SDIO, host->base + JZ_REG_MMC_IREG); + mmc_signal_sdio_irq(host->mmc); + irq_reg &= ~JZ_MMC_IRQ_SDIO; + } + + if (host->req && cmd && irq_reg) { + if (test_and_clear_bit(0, &host->waiting)) { + del_timer(&host->timeout_timer); + + status = readl(host->base + JZ_REG_MMC_STATUS); + + if (status & JZ_MMC_STATUS_TIMEOUT_RES) { + cmd->error = -ETIMEDOUT; + } else if (status & JZ_MMC_STATUS_CRC_RES_ERR) { + cmd->error = -EIO; + } else if (status & (JZ_MMC_STATUS_CRC_READ_ERROR | + JZ_MMC_STATUS_CRC_WRITE_ERROR)) { + if (cmd->data) + cmd->data->error = -EIO; + cmd->error = -EIO; + } else if (status & (JZ_MMC_STATUS_CRC_READ_ERROR | + JZ_MMC_STATUS_CRC_WRITE_ERROR)) { + if (cmd->data) + cmd->data->error = -EIO; + cmd->error = -EIO; + } + + jz4740_mmc_set_irq_enabled(host, irq_reg, false); + writew(irq_reg, host->base + JZ_REG_MMC_IREG); + + return IRQ_WAKE_THREAD; + } + } + + return IRQ_HANDLED; +} + +static int jz4740_mmc_set_clock_rate(struct jz4740_mmc_host *host, int rate) +{ + int div = 0; + int real_rate; + + jz4740_mmc_clock_disable(host); + clk_set_rate(host->clk, JZ_MMC_CLK_RATE); + + real_rate = clk_get_rate(host->clk); + + while (real_rate > rate && div < 7) { + ++div; + real_rate >>= 1; + } + + writew(div, host->base + JZ_REG_MMC_CLKRT); + return real_rate; +} + +static void jz4740_mmc_request(struct mmc_host *mmc, struct mmc_request *req) +{ + struct jz4740_mmc_host *host = mmc_priv(mmc); + + host->req = req; + + writew(0xffff, host->base + JZ_REG_MMC_IREG); + + writew(JZ_MMC_IRQ_END_CMD_RES, host->base + JZ_REG_MMC_IREG); + jz4740_mmc_set_irq_enabled(host, JZ_MMC_IRQ_END_CMD_RES, true); + + host->state = JZ4740_MMC_STATE_READ_RESPONSE; + set_bit(0, &host->waiting); + mod_timer(&host->timeout_timer, jiffies + 5*HZ); + jz4740_mmc_send_command(host, req->cmd); +} + +static void jz4740_mmc_set_ios(struct mmc_host *mmc, struct mmc_ios *ios) +{ + struct jz4740_mmc_host *host = mmc_priv(mmc); + if (ios->clock) + jz4740_mmc_set_clock_rate(host, ios->clock); + + switch (ios->power_mode) { + case MMC_POWER_UP: + jz4740_mmc_reset(host); + if (gpio_is_valid(host->pdata->gpio_power)) + gpio_set_value(host->pdata->gpio_power, + !host->pdata->power_active_low); + host->cmdat |= JZ_MMC_CMDAT_INIT; + clk_enable(host->clk); + break; + case MMC_POWER_ON: + break; + default: + if (gpio_is_valid(host->pdata->gpio_power)) + gpio_set_value(host->pdata->gpio_power, + host->pdata->power_active_low); + clk_disable(host->clk); + break; + } + + switch (ios->bus_width) { + case MMC_BUS_WIDTH_1: + host->cmdat &= ~JZ_MMC_CMDAT_BUS_WIDTH_4BIT; + break; + case MMC_BUS_WIDTH_4: + host->cmdat |= JZ_MMC_CMDAT_BUS_WIDTH_4BIT; + break; + default: + break; + } +} + +static int jz4740_mmc_get_ro(struct mmc_host *mmc) +{ + struct jz4740_mmc_host *host = mmc_priv(mmc); + if (!gpio_is_valid(host->pdata->gpio_read_only)) + return -ENOSYS; + + return gpio_get_value(host->pdata->gpio_read_only) ^ + host->pdata->read_only_active_low; +} + +static int jz4740_mmc_get_cd(struct mmc_host *mmc) +{ + struct jz4740_mmc_host *host = mmc_priv(mmc); + if (!gpio_is_valid(host->pdata->gpio_card_detect)) + return -ENOSYS; + + return gpio_get_value(host->pdata->gpio_card_detect) ^ + host->pdata->card_detect_active_low; +} + +static irqreturn_t jz4740_mmc_card_detect_irq(int irq, void *devid) +{ + struct jz4740_mmc_host *host = devid; + + mmc_detect_change(host->mmc, HZ / 2); + + return IRQ_HANDLED; +} + +static void jz4740_mmc_enable_sdio_irq(struct mmc_host *mmc, int enable) +{ + struct jz4740_mmc_host *host = mmc_priv(mmc); + jz4740_mmc_set_irq_enabled(host, JZ_MMC_IRQ_SDIO, enable); +} + +static const struct mmc_host_ops jz4740_mmc_ops = { + .request = jz4740_mmc_request, + .set_ios = jz4740_mmc_set_ios, + .get_ro = jz4740_mmc_get_ro, + .get_cd = jz4740_mmc_get_cd, + .enable_sdio_irq = jz4740_mmc_enable_sdio_irq, +}; + +static const struct jz_gpio_bulk_request jz4740_mmc_pins[] = { + JZ_GPIO_BULK_PIN(MSC_CMD), + JZ_GPIO_BULK_PIN(MSC_CLK), + JZ_GPIO_BULK_PIN(MSC_DATA0), + JZ_GPIO_BULK_PIN(MSC_DATA1), + JZ_GPIO_BULK_PIN(MSC_DATA2), + JZ_GPIO_BULK_PIN(MSC_DATA3), +}; + +static int __devinit jz4740_mmc_request_gpio(struct device *dev, int gpio, + const char *name, bool output, int value) +{ + int ret; + + if (!gpio_is_valid(gpio)) + return 0; + + ret = gpio_request(gpio, name); + if (ret) { + dev_err(dev, "Failed to request %s gpio: %d\n", name, ret); + return ret; + } + + if (output) + gpio_direction_output(gpio, value); + else + gpio_direction_input(gpio); + + return 0; +} + +static int __devinit jz4740_mmc_request_gpios(struct platform_device *pdev) +{ + int ret; + struct jz4740_mmc_platform_data *pdata = pdev->dev.platform_data; + + if (!pdata) + return 0; + + ret = jz4740_mmc_request_gpio(&pdev->dev, pdata->gpio_card_detect, + "MMC detect change", false, 0); + if (ret) + goto err; + + ret = jz4740_mmc_request_gpio(&pdev->dev, pdata->gpio_read_only, + "MMC read only", false, 0); + if (ret) + goto err_free_gpio_card_detect; + + ret = jz4740_mmc_request_gpio(&pdev->dev, pdata->gpio_power, + "MMC read only", true, pdata->power_active_low); + if (ret) + goto err_free_gpio_read_only; + + return 0; + +err_free_gpio_read_only: + if (gpio_is_valid(pdata->gpio_read_only)) + gpio_free(pdata->gpio_read_only); +err_free_gpio_card_detect: + if (gpio_is_valid(pdata->gpio_card_detect)) + gpio_free(pdata->gpio_card_detect); +err: + return ret; +} + +static int __devinit jz4740_mmc_request_cd_irq(struct platform_device *pdev, + struct jz4740_mmc_host *host) +{ + struct jz4740_mmc_platform_data *pdata = pdev->dev.platform_data; + + if (!gpio_is_valid(pdata->gpio_card_detect)) + return 0; + + host->card_detect_irq = gpio_to_irq(pdata->gpio_card_detect); + if (host->card_detect_irq < 0) { + dev_warn(&pdev->dev, "Failed to get card detect irq\n"); + return 0; + } + + return request_irq(host->card_detect_irq, jz4740_mmc_card_detect_irq, + IRQF_TRIGGER_RISING | IRQF_TRIGGER_FALLING, + "MMC card detect", host); +} + +static void jz4740_mmc_free_gpios(struct platform_device *pdev) +{ + struct jz4740_mmc_platform_data *pdata = pdev->dev.platform_data; + + if (!pdata) + return; + + if (gpio_is_valid(pdata->gpio_power)) + gpio_free(pdata->gpio_power); + if (gpio_is_valid(pdata->gpio_read_only)) + gpio_free(pdata->gpio_read_only); + if (gpio_is_valid(pdata->gpio_card_detect)) + gpio_free(pdata->gpio_card_detect); +} + +static inline size_t jz4740_mmc_num_pins(struct jz4740_mmc_host *host) +{ + size_t num_pins = ARRAY_SIZE(jz4740_mmc_pins); + if (host->pdata && host->pdata->data_1bit) + num_pins -= 3; + + return num_pins; +} + +static int __devinit jz4740_mmc_probe(struct platform_device* pdev) +{ + int ret; + struct mmc_host *mmc; + struct jz4740_mmc_host *host; + struct jz4740_mmc_platform_data *pdata; + + pdata = pdev->dev.platform_data; + + mmc = mmc_alloc_host(sizeof(struct jz4740_mmc_host), &pdev->dev); + if (!mmc) { + dev_err(&pdev->dev, "Failed to alloc mmc host structure\n"); + return -ENOMEM; + } + + host = mmc_priv(mmc); + host->pdata = pdata; + + host->irq = platform_get_irq(pdev, 0); + if (host->irq < 0) { + ret = host->irq; + dev_err(&pdev->dev, "Failed to get platform irq: %d\n", ret); + goto err_free_host; + } + + host->clk = clk_get(&pdev->dev, "mmc"); + if (!host->clk) { + ret = -ENOENT; + dev_err(&pdev->dev, "Failed to get mmc clock\n"); + goto err_free_host; + } + + host->mem = platform_get_resource(pdev, IORESOURCE_MEM, 0); + if (!host->mem) { + ret = -ENOENT; + dev_err(&pdev->dev, "Failed to get base platform memory\n"); + goto err_clk_put; + } + + host->mem = request_mem_region(host->mem->start, + resource_size(host->mem), pdev->name); + if (!host->mem) { + ret = -EBUSY; + dev_err(&pdev->dev, "Failed to request base memory region\n"); + goto err_clk_put; + } + + host->base = ioremap_nocache(host->mem->start, resource_size(host->mem)); + if (!host->base) { + ret = -EBUSY; + dev_err(&pdev->dev, "Failed to ioremap base memory\n"); + goto err_release_mem_region; + } + + ret = jz_gpio_bulk_request(jz4740_mmc_pins, jz4740_mmc_num_pins(host)); + if (ret) { + dev_err(&pdev->dev, "Failed to request mmc pins: %d\n", ret); + goto err_iounmap; + } + + ret = jz4740_mmc_request_gpios(pdev); + if (ret) + goto err_gpio_bulk_free; + + mmc->ops = &jz4740_mmc_ops; + mmc->f_min = JZ_MMC_CLK_RATE / 128; + mmc->f_max = JZ_MMC_CLK_RATE; + mmc->ocr_avail = MMC_VDD_32_33 | MMC_VDD_33_34; + mmc->caps = (pdata && pdata->data_1bit) ? 0 : MMC_CAP_4_BIT_DATA; + mmc->caps |= MMC_CAP_SDIO_IRQ; + + mmc->max_blk_size = (1 << 10) - 1; + mmc->max_blk_count = (1 << 15) - 1; + mmc->max_req_size = mmc->max_blk_size * mmc->max_blk_count; + + mmc->max_phys_segs = 128; + mmc->max_hw_segs = 128; + mmc->max_seg_size = mmc->max_req_size; + + host->mmc = mmc; + host->pdev = pdev; + spin_lock_init(&host->lock); + host->irq_mask = 0xffff; + + ret = jz4740_mmc_request_cd_irq(pdev, host); + if (ret) { + dev_err(&pdev->dev, "Failed to request card detect irq\n"); + goto err_free_gpios; + } + + ret = request_threaded_irq(host->irq, jz_mmc_irq, jz_mmc_irq_worker, 0, + dev_name(&pdev->dev), host); + if (ret) { + dev_err(&pdev->dev, "Failed to request irq: %d\n", ret); + goto err_free_card_detect_irq; + } + + jz4740_mmc_reset(host); + jz4740_mmc_clock_disable(host); + setup_timer(&host->timeout_timer, jz4740_mmc_timeout, + (unsigned long)host); + /* It is not important when it times out, it just needs to timeout. */ + set_timer_slack(&host->timeout_timer, HZ); + + platform_set_drvdata(pdev, host); + ret = mmc_add_host(mmc); + + if (ret) { + dev_err(&pdev->dev, "Failed to add mmc host: %d\n", ret); + goto err_free_irq; + } + dev_info(&pdev->dev, "JZ SD/MMC card driver registered\n"); + + return 0; + +err_free_irq: + free_irq(host->irq, host); +err_free_card_detect_irq: + if (host->card_detect_irq >= 0) + free_irq(host->card_detect_irq, host); +err_free_gpios: + jz4740_mmc_free_gpios(pdev); +err_gpio_bulk_free: + jz_gpio_bulk_free(jz4740_mmc_pins, jz4740_mmc_num_pins(host)); +err_iounmap: + iounmap(host->base); +err_release_mem_region: + release_mem_region(host->mem->start, resource_size(host->mem)); +err_clk_put: + clk_put(host->clk); +err_free_host: + platform_set_drvdata(pdev, NULL); + mmc_free_host(mmc); + + return ret; +} + +static int __devexit jz4740_mmc_remove(struct platform_device *pdev) +{ + struct jz4740_mmc_host *host = platform_get_drvdata(pdev); + + del_timer_sync(&host->timeout_timer); + jz4740_mmc_set_irq_enabled(host, 0xff, false); + jz4740_mmc_reset(host); + + mmc_remove_host(host->mmc); + + free_irq(host->irq, host); + if (host->card_detect_irq >= 0) + free_irq(host->card_detect_irq, host); + + jz4740_mmc_free_gpios(pdev); + jz_gpio_bulk_free(jz4740_mmc_pins, jz4740_mmc_num_pins(host)); + + iounmap(host->base); + release_mem_region(host->mem->start, resource_size(host->mem)); + + clk_put(host->clk); + + platform_set_drvdata(pdev, NULL); + mmc_free_host(host->mmc); + + return 0; +} + +#ifdef CONFIG_PM + +static int jz4740_mmc_suspend(struct device *dev) +{ + struct jz4740_mmc_host *host = dev_get_drvdata(dev); + + mmc_suspend_host(host->mmc); + + jz_gpio_bulk_suspend(jz4740_mmc_pins, jz4740_mmc_num_pins(host)); + + return 0; +} + +static int jz4740_mmc_resume(struct device *dev) +{ + struct jz4740_mmc_host *host = dev_get_drvdata(dev); + + jz_gpio_bulk_resume(jz4740_mmc_pins, jz4740_mmc_num_pins(host)); + + mmc_resume_host(host->mmc); + + return 0; +} + +const struct dev_pm_ops jz4740_mmc_pm_ops = { + .suspend = jz4740_mmc_suspend, + .resume = jz4740_mmc_resume, + .poweroff = jz4740_mmc_suspend, + .restore = jz4740_mmc_resume, +}; + +#define JZ4740_MMC_PM_OPS (&jz4740_mmc_pm_ops) +#else +#define JZ4740_MMC_PM_OPS NULL +#endif + +static struct platform_driver jz4740_mmc_driver = { + .probe = jz4740_mmc_probe, + .remove = __devexit_p(jz4740_mmc_remove), + .driver = { + .name = "jz4740-mmc", + .owner = THIS_MODULE, + .pm = JZ4740_MMC_PM_OPS, + }, +}; + +static int __init jz4740_mmc_init(void) +{ + return platform_driver_register(&jz4740_mmc_driver); +} +module_init(jz4740_mmc_init); + +static void __exit jz4740_mmc_exit(void) +{ + platform_driver_unregister(&jz4740_mmc_driver); +} +module_exit(jz4740_mmc_exit); + +MODULE_DESCRIPTION("JZ4740 SD/MMC controller driver"); +MODULE_LICENSE("GPL"); +MODULE_AUTHOR("Lars-Peter Clausen <lars@metafoo.de>"); |