/* * 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_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>");