diff options
| -rw-r--r-- | arch/arm/plat-mxc/include/mach/mmc.h | 36 | ||||
| -rw-r--r-- | drivers/mmc/host/Kconfig | 10 | ||||
| -rw-r--r-- | drivers/mmc/host/Makefile | 1 | ||||
| -rw-r--r-- | drivers/mmc/host/mxcmmc.c | 880 |
4 files changed, 927 insertions, 0 deletions
diff --git a/arch/arm/plat-mxc/include/mach/mmc.h b/arch/arm/plat-mxc/include/mach/mmc.h new file mode 100644 index 00000000000..de2128dada5 --- /dev/null +++ b/arch/arm/plat-mxc/include/mach/mmc.h @@ -0,0 +1,36 @@ +#ifndef ASMARM_ARCH_MMC_H +#define ASMARM_ARCH_MMC_H + +#include <linux/mmc/host.h> + +struct device; + +/* board specific SDHC data, optional. + * If not present, a writable card with 3,3V is assumed. + */ +struct imxmmc_platform_data { + /* Return values for the get_ro callback should be: + * 0 for a read/write card + * 1 for a read-only card + * -ENOSYS when not supported (equal to NULL callback) + * or a negative errno value when something bad happened + */ + int (*get_ro)(struct device *); + + /* board specific hook to (de)initialize the SD slot. + * The board code can call 'handler' on a card detection + * change giving data as argument. + */ + int (*init)(struct device *dev, irq_handler_t handler, void *data); + void (*exit)(struct device *dev, void *data); + + /* available voltages. If not given, assume + * MMC_VDD_32_33 | MMC_VDD_33_34 + */ + unsigned int ocr_avail; + + /* adjust slot voltage */ + void (*setpower)(struct device *, unsigned int vdd); +}; + +#endif diff --git a/drivers/mmc/host/Kconfig b/drivers/mmc/host/Kconfig index 0efa390978b..99d4b28d52e 100644 --- a/drivers/mmc/host/Kconfig +++ b/drivers/mmc/host/Kconfig @@ -145,6 +145,16 @@ config MMC_IMX If unsure, say N. +config MMC_MXC + tristate "Freescale i.MX2/3 Multimedia Card Interface support" + depends on ARCH_MXC + help + This selects the Freescale i.MX2/3 Multimedia card Interface. + If you have a i.MX platform with a Multimedia Card slot, + say Y or M here. + + If unsure, say N. + config MMC_TIFM_SD tristate "TI Flash Media MMC/SD Interface support (EXPERIMENTAL)" depends on EXPERIMENTAL && PCI diff --git a/drivers/mmc/host/Makefile b/drivers/mmc/host/Makefile index 98cab84829b..dedec55861d 100644 --- a/drivers/mmc/host/Makefile +++ b/drivers/mmc/host/Makefile @@ -9,6 +9,7 @@ endif obj-$(CONFIG_MMC_ARMMMCI) += mmci.o obj-$(CONFIG_MMC_PXA) += pxamci.o obj-$(CONFIG_MMC_IMX) += imxmmc.o +obj-$(CONFIG_MMC_MXC) += mxcmmc.o obj-$(CONFIG_MMC_SDHCI) += sdhci.o obj-$(CONFIG_MMC_SDHCI_PCI) += sdhci-pci.o obj-$(CONFIG_MMC_RICOH_MMC) += ricoh_mmc.o diff --git a/drivers/mmc/host/mxcmmc.c b/drivers/mmc/host/mxcmmc.c new file mode 100644 index 00000000000..dda0be4e25d --- /dev/null +++ b/drivers/mmc/host/mxcmmc.c @@ -0,0 +1,880 @@ +/* + * linux/drivers/mmc/host/mxcmmc.c - Freescale i.MX MMCI driver + * + * This is a driver for the SDHC controller found in Freescale MX2/MX3 + * SoCs. It is basically the same hardware as found on MX1 (imxmmc.c). + * Unlike the hardware found on MX1, this hardware just works and does + * not need all the quirks found in imxmmc.c, hence the seperate driver. + * + * Copyright (C) 2008 Sascha Hauer, Pengutronix <s.hauer@pengutronix.de> + * Copyright (C) 2006 Pavel Pisa, PiKRON <ppisa@pikron.com> + * + * derived from pxamci.c by Russell King + * + * 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. + * + */ + +#include <linux/module.h> +#include <linux/init.h> +#include <linux/ioport.h> +#include <linux/platform_device.h> +#include <linux/interrupt.h> +#include <linux/irq.h> +#include <linux/blkdev.h> +#include <linux/dma-mapping.h> +#include <linux/mmc/host.h> +#include <linux/mmc/card.h> +#include <linux/delay.h> +#include <linux/clk.h> +#include <linux/io.h> +#include <linux/gpio.h> + +#include <asm/dma.h> +#include <asm/irq.h> +#include <asm/sizes.h> +#include <mach/mmc.h> + +#ifdef CONFIG_ARCH_MX2 +#include <mach/dma-mx1-mx2.h> +#define HAS_DMA +#endif + +#define DRIVER_NAME "imx-mmc" + +#define MMC_REG_STR_STP_CLK 0x00 +#define MMC_REG_STATUS 0x04 +#define MMC_REG_CLK_RATE 0x08 +#define MMC_REG_CMD_DAT_CONT 0x0C +#define MMC_REG_RES_TO 0x10 +#define MMC_REG_READ_TO 0x14 +#define MMC_REG_BLK_LEN 0x18 +#define MMC_REG_NOB 0x1C +#define MMC_REG_REV_NO 0x20 +#define MMC_REG_INT_CNTR 0x24 +#define MMC_REG_CMD 0x28 +#define MMC_REG_ARG 0x2C +#define MMC_REG_RES_FIFO 0x34 +#define MMC_REG_BUFFER_ACCESS 0x38 + +#define STR_STP_CLK_RESET (1 << 3) +#define STR_STP_CLK_START_CLK (1 << 1) +#define STR_STP_CLK_STOP_CLK (1 << 0) + +#define STATUS_CARD_INSERTION (1 << 31) +#define STATUS_CARD_REMOVAL (1 << 30) +#define STATUS_YBUF_EMPTY (1 << 29) +#define STATUS_XBUF_EMPTY (1 << 28) +#define STATUS_YBUF_FULL (1 << 27) +#define STATUS_XBUF_FULL (1 << 26) +#define STATUS_BUF_UND_RUN (1 << 25) +#define STATUS_BUF_OVFL (1 << 24) +#define STATUS_SDIO_INT_ACTIVE (1 << 14) +#define STATUS_END_CMD_RESP (1 << 13) +#define STATUS_WRITE_OP_DONE (1 << 12) +#define STATUS_DATA_TRANS_DONE (1 << 11) +#define STATUS_READ_OP_DONE (1 << 11) +#define STATUS_WR_CRC_ERROR_CODE_MASK (3 << 10) +#define STATUS_CARD_BUS_CLK_RUN (1 << 8) +#define STATUS_BUF_READ_RDY (1 << 7) +#define STATUS_BUF_WRITE_RDY (1 << 6) +#define STATUS_RESP_CRC_ERR (1 << 5) +#define STATUS_CRC_READ_ERR (1 << 3) +#define STATUS_CRC_WRITE_ERR (1 << 2) +#define STATUS_TIME_OUT_RESP (1 << 1) +#define STATUS_TIME_OUT_READ (1 << 0) +#define STATUS_ERR_MASK 0x2f + +#define CMD_DAT_CONT_CMD_RESP_LONG_OFF (1 << 12) +#define CMD_DAT_CONT_STOP_READWAIT (1 << 11) +#define CMD_DAT_CONT_START_READWAIT (1 << 10) +#define CMD_DAT_CONT_BUS_WIDTH_4 (2 << 8) +#define CMD_DAT_CONT_INIT (1 << 7) +#define CMD_DAT_CONT_WRITE (1 << 4) +#define CMD_DAT_CONT_DATA_ENABLE (1 << 3) +#define CMD_DAT_CONT_RESPONSE_48BIT_CRC (1 << 0) +#define CMD_DAT_CONT_RESPONSE_136BIT (2 << 0) +#define CMD_DAT_CONT_RESPONSE_48BIT (3 << 0) + +#define INT_SDIO_INT_WKP_EN (1 << 18) +#define INT_CARD_INSERTION_WKP_EN (1 << 17) +#define INT_CARD_REMOVAL_WKP_EN (1 << 16) +#define INT_CARD_INSERTION_EN (1 << 15) +#define INT_CARD_REMOVAL_EN (1 << 14) +#define INT_SDIO_IRQ_EN (1 << 13) +#define INT_DAT0_EN (1 << 12) +#define INT_BUF_READ_EN (1 << 4) +#define INT_BUF_WRITE_EN (1 << 3) +#define INT_END_CMD_RES_EN (1 << 2) +#define INT_WRITE_OP_DONE_EN (1 << 1) +#define INT_READ_OP_EN (1 << 0) + +struct mxcmci_host { + struct mmc_host *mmc; + struct resource *res; + void __iomem *base; + int irq; + int detect_irq; + int dma; + int do_dma; + unsigned int power_mode; + struct imxmmc_platform_data *pdata; + + struct mmc_request *req; + struct mmc_command *cmd; + struct mmc_data *data; + + unsigned int dma_nents; + unsigned int datasize; + unsigned int dma_dir; + + u16 rev_no; + unsigned int cmdat; + + struct clk *clk; + + int clock; + + struct work_struct datawork; +}; + +static inline int mxcmci_use_dma(struct mxcmci_host *host) +{ + return host->do_dma; +} + +static void mxcmci_softreset(struct mxcmci_host *host) +{ + int i; + + /* reset sequence */ + writew(STR_STP_CLK_RESET, host->base + MMC_REG_STR_STP_CLK); + writew(STR_STP_CLK_RESET | STR_STP_CLK_START_CLK, + host->base + MMC_REG_STR_STP_CLK); + + for (i = 0; i < 8; i++) + writew(STR_STP_CLK_START_CLK, host->base + MMC_REG_STR_STP_CLK); + + writew(0xff, host->base + MMC_REG_RES_TO); +} + +static void mxcmci_setup_data(struct mxcmci_host *host, struct mmc_data *data) +{ + unsigned int nob = data->blocks; + unsigned int blksz = data->blksz; + unsigned int datasize = nob * blksz; +#ifdef HAS_DMA + struct scatterlist *sg; + int i; +#endif + if (data->flags & MMC_DATA_STREAM) + nob = 0xffff; + + host->data = data; + data->bytes_xfered = 0; + + writew(nob, host->base + MMC_REG_NOB); + writew(blksz, host->base + MMC_REG_BLK_LEN); + host->datasize = datasize; + +#ifdef HAS_DMA + for_each_sg(data->sg, sg, data->sg_len, i) { + if (sg->offset & 3 || sg->length & 3) { + host->do_dma = 0; + return; + } + } + + if (data->flags & MMC_DATA_READ) { + host->dma_dir = DMA_FROM_DEVICE; + host->dma_nents = dma_map_sg(mmc_dev(host->mmc), data->sg, + data->sg_len, host->dma_dir); + + imx_dma_setup_sg(host->dma, data->sg, host->dma_nents, datasize, + host->res->start + MMC_REG_BUFFER_ACCESS, + DMA_MODE_READ); + } else { + host->dma_dir = DMA_TO_DEVICE; + host->dma_nents = dma_map_sg(mmc_dev(host->mmc), data->sg, + data->sg_len, host->dma_dir); + + imx_dma_setup_sg(host->dma, data->sg, host->dma_nents, datasize, + host->res->start + MMC_REG_BUFFER_ACCESS, + DMA_MODE_WRITE); + } + + wmb(); + + imx_dma_enable(host->dma); +#endif /* HAS_DMA */ +} + +static int mxcmci_start_cmd(struct mxcmci_host *host, struct mmc_command *cmd, + unsigned int cmdat) +{ + WARN_ON(host->cmd != NULL); + host->cmd = cmd; + + switch (mmc_resp_type(cmd)) { + case MMC_RSP_R1: /* short CRC, OPCODE */ + case MMC_RSP_R1B:/* short CRC, OPCODE, BUSY */ + cmdat |= CMD_DAT_CONT_RESPONSE_48BIT_CRC; + break; + case MMC_RSP_R2: /* long 136 bit + CRC */ + cmdat |= CMD_DAT_CONT_RESPONSE_136BIT; + break; + case MMC_RSP_R3: /* short */ + cmdat |= CMD_DAT_CONT_RESPONSE_48BIT; + break; + case MMC_RSP_NONE: + break; + default: + dev_err(mmc_dev(host->mmc), "unhandled response type 0x%x\n", + mmc_resp_type(cmd)); + cmd->error = -EINVAL; + return -EINVAL; + } + + if (mxcmci_use_dma(host)) + writel(INT_READ_OP_EN | INT_WRITE_OP_DONE_EN | + INT_END_CMD_RES_EN, + host->base + MMC_REG_INT_CNTR); + else + writel(INT_END_CMD_RES_EN, host->base + MMC_REG_INT_CNTR); + + writew(cmd->opcode, host->base + MMC_REG_CMD); + writel(cmd->arg, host->base + MMC_REG_ARG); + writew(cmdat, host->base + MMC_REG_CMD_DAT_CONT); + + return 0; +} + +static void mxcmci_finish_request(struct mxcmci_host *host, + struct mmc_request *req) +{ + writel(0, host->base + MMC_REG_INT_CNTR); + + host->req = NULL; + host->cmd = NULL; + host->data = NULL; + + mmc_request_done(host->mmc, req); +} + +static int mxcmci_finish_data(struct mxcmci_host *host, unsigned int stat) +{ + struct mmc_data *data = host->data; + int data_error; + +#ifdef HAS_DMA + if (mxcmci_use_dma(host)) { + imx_dma_disable(host->dma); + dma_unmap_sg(mmc_dev(host->mmc), data->sg, host->dma_nents, + host->dma_dir); + } +#endif + + if (stat & STATUS_ERR_MASK) { + dev_dbg(mmc_dev(host->mmc), "request failed. status: 0x%08x\n", + stat); + if (stat & STATUS_CRC_READ_ERR) { + data->error = -EILSEQ; + } else if (stat & STATUS_CRC_WRITE_ERR) { + u32 err_code = (stat >> 9) & 0x3; + if (err_code == 2) /* No CRC response */ + data->error = -ETIMEDOUT; + else + data->error = -EILSEQ; + } else if (stat & STATUS_TIME_OUT_READ) { + data->error = -ETIMEDOUT; + } else { + data->error = -EIO; + } + } else { + data->bytes_xfered = host->datasize; + } + + data_error = data->error; + + host->data = NULL; + + return data_error; +} + +static void mxcmci_read_response(struct mxcmci_host *host, unsigned int stat) +{ + struct mmc_command *cmd = host->cmd; + int i; + u32 a, b, c; + + if (!cmd) + return; + + if (stat & STATUS_TIME_OUT_RESP) { + dev_dbg(mmc_dev(host->mmc), "CMD TIMEOUT\n"); + cmd->error = -ETIMEDOUT; + } else if (stat & STATUS_RESP_CRC_ERR && cmd->flags & MMC_RSP_CRC) { + dev_dbg(mmc_dev(host->mmc), "cmd crc error\n"); + cmd->error = -EILSEQ; + } + + if (cmd->flags & MMC_RSP_PRESENT) { + if (cmd->flags & MMC_RSP_136) { + for (i = 0; i < 4; i++) { + a = readw(host->base + MMC_REG_RES_FIFO); + b = readw(host->base + MMC_REG_RES_FIFO); + cmd->resp[i] = a << 16 | b; + } + } else { + a = readw(host->base + MMC_REG_RES_FIFO); + b = readw(host->base + MMC_REG_RES_FIFO); + c = readw(host->base + MMC_REG_RES_FIFO); + cmd->resp[0] = a << 24 | b << 8 | c >> 8; + } + } +} + +static int mxcmci_poll_status(struct mxcmci_host *host, u32 mask) +{ + u32 stat; + unsigned long timeout = jiffies + HZ; + + do { + stat = readl(host->base + MMC_REG_STATUS); + if (stat & STATUS_ERR_MASK) + return stat; + if (time_after(jiffies, timeout)) + return STATUS_TIME_OUT_READ; + if (stat & mask) + return 0; + cpu_relax(); + } while (1); +} + +static int mxcmci_pull(struct mxcmci_host *host, void *_buf, int bytes) +{ + unsigned int stat; + u32 *buf = _buf; + + while (bytes > 3) { + stat = mxcmci_poll_status(host, + STATUS_BUF_READ_RDY | STATUS_READ_OP_DONE); + if (stat) + return stat; + *buf++ = readl(host->base + MMC_REG_BUFFER_ACCESS); + bytes -= 4; + } + + if (bytes) { + u8 *b = (u8 *)buf; + u32 tmp; + + stat = mxcmci_poll_status(host, + STATUS_BUF_READ_RDY | STATUS_READ_OP_DONE); + if (stat) + return stat; + tmp = readl(host->base + MMC_REG_BUFFER_ACCESS); + memcpy(b, &tmp, bytes); + } + + return 0; +} + +static int mxcmci_push(struct mxcmci_host *host, void *_buf, int bytes) +{ + unsigned int stat; + u32 *buf = _buf; + + while (bytes > 3) { + stat = mxcmci_poll_status(host, STATUS_BUF_WRITE_RDY); + if (stat) + return stat; + writel(*buf++, host->base + MMC_REG_BUFFER_ACCESS); + bytes -= 4; + } + + if (bytes) { + u8 *b = (u8 *)buf; + u32 tmp; + + stat = mxcmci_poll_status(host, STATUS_BUF_WRITE_RDY); + if (stat) + return stat; + + memcpy(&tmp, b, bytes); + writel(tmp, host->base + MMC_REG_BUFFER_ACCESS); + } + + stat = mxcmci_poll_status(host, STATUS_BUF_WRITE_RDY); + if (stat) + return stat; + + return 0; +} + +static int mxcmci_transfer_data(struct mxcmci_host *host) +{ + struct mmc_data *data = host->req->data; + struct scatterlist *sg; + int stat, i; + + host->datasize = 0; + + host->data = data; + host->datasize = 0; + + if (data->flags & MMC_DATA_READ) { + for_each_sg(data->sg, sg, data->sg_len, i) { + stat = mxcmci_pull(host, sg_virt(sg), sg->length); + if (stat) + return stat; + host->datasize += sg->length; + } + } else { + for_each_sg(data->sg, sg, data->sg_len, i) { + stat = mxcmci_push(host, sg_virt(sg), sg->length); + if (stat) + return stat; + host->datasize += sg->length; + } + stat = mxcmci_poll_status(host, STATUS_WRITE_OP_DONE); + if (stat) + return stat; + } + return 0; +} + +static void mxcmci_datawork(struct work_struct *work) +{ + struct mxcmci_host *host = container_of(work, struct mxcmci_host, + datawork); + int datastat = mxcmci_transfer_data(host); + mxcmci_finish_data(host, datastat); + + if (host->req->stop) { + if (mxcmci_start_cmd(host, host->req->stop, 0)) { + mxcmci_finish_request(host, host->req); + return; + } + } else { + mxcmci_finish_request(host, host->req); + } +} + +#ifdef HAS_DMA +static void mxcmci_data_done(struct mxcmci_host *host, unsigned int stat) +{ + struct mmc_data *data = host->data; + int data_error; + + if (!data) + return; + + data_error = mxcmci_finish_data(host, stat); + + mxcmci_read_response(host, stat); + host->cmd = NULL; + + if (host->req->stop) { + if (mxcmci_start_cmd(host, host->req->stop, 0)) { + mxcmci_finish_request(host, host->req); + return; + } + } else { + mxcmci_finish_request(host, host->req); + } +} +#endif /* HAS_DMA */ + +static void mxcmci_cmd_done(struct mxcmci_host *host, unsigned int stat) +{ + mxcmci_read_response(host, stat); + host->cmd = NULL; + + if (!host->data && host->req) { + mxcmci_finish_request(host, host->req); + return; + } + + /* For the DMA case the DMA engine handles the data transfer + * automatically. For non DMA we have to to it ourselves. + * Don't do it in interrupt context though. + */ + if (!mxcmci_use_dma(host) && host->data) + schedule_work(&host->datawork); + +} + +static irqreturn_t mxcmci_irq(int irq, void *devid) +{ + struct mxcmci_host *host = devid; + u32 stat; + + stat = readl(host->base + MMC_REG_STATUS); + writel(stat, host->base + MMC_REG_STATUS); + + dev_dbg(mmc_dev(host->mmc), "%s: 0x%08x\n", __func__, stat); + + if (stat & STATUS_END_CMD_RESP) + mxcmci_cmd_done(host, stat); +#ifdef HAS_DMA + if (mxcmci_use_dma(host) && + (stat & (STATUS_DATA_TRANS_DONE | STATUS_WRITE_OP_DONE))) + mxcmci_data_done(host, stat); +#endif + return IRQ_HANDLED; +} + +static void mxcmci_request(struct mmc_host *mmc, struct mmc_request *req) +{ + struct mxcmci_host *host = mmc_priv(mmc); + unsigned int cmdat = host->cmdat; + + WARN_ON(host->req != NULL); + + host->req = req; + host->cmdat &= ~CMD_DAT_CONT_INIT; +#ifdef HAS_DMA + host->do_dma = 1; +#endif + if (req->data) { + mxcmci_setup_data(host, req->data); + + cmdat |= CMD_DAT_CONT_DATA_ENABLE; + + if (req->data->flags & MMC_DATA_WRITE) + cmdat |= CMD_DAT_CONT_WRITE; + } + + if (mxcmci_start_cmd(host, req->cmd, cmdat)) + mxcmci_finish_request(host, req); +} + +static void mxcmci_set_clk_rate(struct mxcmci_host *host, unsigned int clk_ios) +{ + unsigned int divider; + int prescaler = 0; + unsigned int clk_in = clk_get_rate(host->clk); + + while (prescaler <= 0x800) { + for (divider = 1; divider <= 0xF; divider++) { + int x; + + x = (clk_in / (divider + 1)); + + if (prescaler) + x /= (prescaler * 2); + + if (x <= clk_ios) + break; + } + if (divider < 0x10) + break; + + if (prescaler == 0) + prescaler = 1; + else + prescaler <<= 1; + } + + writew((prescaler << 4) | divider, host->base + MMC_REG_CLK_RATE); + + dev_dbg(mmc_dev(host->mmc), "scaler: %d divider: %d in: %d out: %d\n", + prescaler, divider, clk_in, clk_ios); +} + +static void mxcmci_set_ios(struct mmc_host *mmc, struct mmc_ios *ios) +{ + struct mxcmci_host *host = mmc_priv(mmc); +#ifdef HAS_DMA + unsigned int blen; + /* + * use burstlen of 64 in 4 bit mode (--> reg value 0) + * use burstlen of 16 in 1 bit mode (--> reg value 16) + */ + if (ios->bus_width == MMC_BUS_WIDTH_4) + blen = 0; + else + blen = 16; + + imx_dma_config_burstlen(host->dma, blen); +#endif + if (ios->bus_width == MMC_BUS_WIDTH_4) + host->cmdat |= CMD_DAT_CONT_BUS_WIDTH_4; + else + host->cmdat &= ~CMD_DAT_CONT_BUS_WIDTH_4; + + if (host->power_mode != ios->power_mode) { + if (host->pdata && host->pdata->setpower) + host->pdata->setpower(mmc_dev(mmc), ios->vdd); + host->power_mode = ios->power_mode; + if (ios->power_mode == MMC_POWER_ON) + host->cmdat |= CMD_DAT_CONT_INIT; + } + + if (ios->clock) { + mxcmci_set_clk_rate(host, ios->clock); + writew(STR_STP_CLK_START_CLK, host->base + MMC_REG_STR_STP_CLK); + } else { + writew(STR_STP_CLK_STOP_CLK, host->base + MMC_REG_STR_STP_CLK); + } + + host->clock = ios->clock; +} + +static irqreturn_t mxcmci_detect_irq(int irq, void *data) +{ + struct mmc_host *mmc = data; + + dev_dbg(mmc_dev(mmc), "%s\n", __func__); + + mmc_detect_change(mmc, msecs_to_jiffies(250)); + return IRQ_HANDLED; +} + +static int mxcmci_get_ro(struct mmc_host *mmc) +{ + struct mxcmci_host *host = mmc_priv(mmc); + + if (host->pdata && host->pdata->get_ro) + return !!host->pdata->get_ro(mmc_dev(mmc)); + /* + * Board doesn't support read only detection; let the mmc core + * decide what to do. + */ + return -ENOSYS; +} + + +static const struct mmc_host_ops mxcmci_ops = { + .request = mxcmci_request, + .set_ios = mxcmci_set_ios, + .get_ro = mxcmci_get_ro, +}; + +static int mxcmci_probe(struct platform_device *pdev) +{ + struct mmc_host *mmc; + struct mxcmci_host *host = NULL; + struct resource *r; + int ret = 0, irq; + + printk(KERN_INFO "i.MX SDHC driver\n"); + + r = platform_get_resource(pdev, IORESOURCE_MEM, 0); + irq = platform_get_irq(pdev, 0); + if (!r || irq < 0) + return -EINVAL; + + r = request_mem_region(r->start, resource_size(r), pdev->name); + if (!r) + return -EBUSY; + + mmc = mmc_alloc_host(sizeof(struct mxcmci_host), &pdev->dev); + if (!mmc) { + ret = -ENOMEM; + goto out_release_mem; + } + + mmc->ops = &mxcmci_ops; + mmc->caps = MMC_CAP_4_BIT_DATA; + + /* MMC core transfer sizes tunable parameters */ + mmc->max_hw_segs = 64; + mmc->max_phys_segs = 64; + mmc->max_blk_size = 2048; + mmc->max_blk_count = 65535; + mmc->max_req_size = mmc->max_blk_size * mmc->max_blk_count; + mmc->max_seg_size = mmc->max_seg_size; + + host = mmc_priv(mmc); + host->base = ioremap(r->start, resource_size(r)); + if (!host->base) { + ret = -ENOMEM; + goto out_free; + } + + host->mmc = mmc; + host->pdata = pdev->dev.platform_data; + + if (host->pdata && host->pdata->ocr_avail) + mmc->ocr_avail = host->pdata->ocr_avail; + else + mmc->ocr_avail = MMC_VDD_32_33 | MMC_VDD_33_34; + + host->res = r; + host->irq = irq; + + host->clk = clk_get(&pdev->dev, "sdhc_clk"); + if (IS_ERR(host->clk)) { + ret = PTR_ERR(host->clk); + goto out_iounmap; + } + clk_enable(host->clk); + + mxcmci_softreset(host); + + host->rev_no = readw(host->base + MMC_REG_REV_NO); + if (host->rev_no != 0x400) { + ret = -ENODEV; + dev_err(mmc_dev(host->mmc), "wrong rev.no. 0x%08x. aborting.\n", + host->rev_no); + goto out_clk_put; + } + + mmc->f_min = clk_get_rate(host->clk) >> 7; + mmc->f_max = clk_get_rate(host->clk) >> 1; + + /* recommended in data sheet */ + writew(0x2db4, host->base + MMC_REG_READ_TO); + + writel(0, host->base + MMC_REG_INT_CNTR); + +#ifdef HAS_DMA + host->dma = imx_dma_request_by_prio(DRIVER_NAME, DMA_PRIO_LOW); + if (host->dma < 0) { + dev_err(mmc_dev(host->mmc), "imx_dma_request_by_prio failed\n"); + ret = -EBUSY; + goto out_clk_put; + } + + r = platform_get_resource(pdev, IORESOURCE_DMA, 0); + if (!r) { + ret = -EINVAL; + goto out_free_dma; + } + + ret = imx_dma_config_channel(host->dma, + IMX_DMA_MEMSIZE_32 | IMX_DMA_TYPE_FIFO, + IMX_DMA_MEMSIZE_32 | IMX_DMA_TYPE_LINEAR, + r->start, 0); + if (ret) { + dev_err(mmc_dev(host->mmc), "failed to config DMA channel\n"); + goto out_free_dma; + } +#endif + INIT_WORK(&host->datawork, mxcmci_datawork); + + ret = request_irq(host->irq, mxcmci_irq, 0, DRIVER_NAME, host); + if (ret) + goto out_free_dma; + + platform_set_drvdata(pdev, mmc); + + if (host->pdata && host->pdata->init) { + ret = host->pdata->init(&pdev->dev, mxcmci_detect_irq, + host->mmc); + if (ret) + goto out_free_irq; + } + + mmc_add_host(mmc); + + return 0; + +out_free_irq: + free_irq(host->irq, host); +out_free_dma: +#ifdef HAS_DMA + imx_dma_free(host->dma); +#endif +out_clk_put: + clk_disable(host->clk); + clk_put(host->clk); +out_iounmap: + iounmap(host->base); +out_free: + mmc_free_host(mmc); +out_release_mem: + release_mem_region(host->res->start, resource_size(host->res)); + return ret; +} + +static int mxcmci_remove(struct platform_device *pdev) +{ + struct mmc_host *mmc = platform_get_drvdata(pdev); + struct mxcmci_host *host = mmc_priv(mmc); + + platform_set_drvdata(pdev, NULL); + + mmc_remove_host(mmc); + + if (host->pdata && host->pdata->exit) + host->pdata->exit(&pdev->dev, mmc); + + free_irq(host->irq, host); + iounmap(host->base); +#ifdef HAS_DMA + imx_dma_free(host->dma); +#endif + clk_disable(host->clk); + clk_put(host->clk); + + release_mem_region(host->res->start, resource_size(host->res)); + release_resource(host->res); + + mmc_free_host(mmc); + + return 0; +} + +#ifdef CONFIG_PM +static int mxcmci_suspend(struct platform_device *dev, pm_message_t state) +{ + struct mmc_host *mmc = platform_get_drvdata(dev); + int ret = 0; + + if (mmc) + ret = mmc_suspend_host(mmc, state); + + return ret; +} + +static int mxcmci_resume(struct platform_device *dev) +{ + struct mmc_host *mmc = platform_get_drvdata(dev); + struct mxcmci_host *host; + int ret = 0; + + if (mmc) { + host = mmc_priv(mmc); + ret = mmc_resume_host(mmc); + } + + return ret; +} +#else +#define mxcmci_suspend NULL +#define mxcmci_resume NULL +#endif /* CONFIG_PM */ + +static struct platform_driver mxcmci_driver = { + .probe = mxcmci_probe, + .remove = mxcmci_remove, + .suspend = mxcmci_suspend, + .resume = mxcmci_resume, + .driver = { + .name = DRIVER_NAME, + .owner = THIS_MODULE, + } +}; + +static int __init mxcmci_init(void) +{ + return platform_driver_register(&mxcmci_driver); +} + +static void __exit mxcmci_exit(void) +{ + platform_driver_unregister(&mxcmci_driver); +} + +module_init(mxcmci_init); +module_exit(mxcmci_exit); + +MODULE_DESCRIPTION("i.MX Multimedia Card Interface Driver"); +MODULE_AUTHOR("Sascha Hauer, Pengutronix"); +MODULE_LICENSE("GPL"); +MODULE_ALIAS("platform:imx-mmc"); |