| /* |
| * Portions copyright (C) 2003 Russell King, PXA MMCI Driver |
| * Portions copyright (C) 2004-2005 Pierre Ossman, W83L51xD SD/MMC driver |
| * |
| * Copyright 2008 Embedded Alley Solutions, Inc. |
| * Copyright 2009-2011 Freescale Semiconductor, Inc. |
| * |
| * 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. |
| * |
| * This program is distributed in the hope that it will be useful, |
| * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| * GNU General Public License for more details. |
| * |
| * 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., |
| * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA. |
| */ |
| |
| #include <linux/kernel.h> |
| #include <linux/init.h> |
| #include <linux/ioport.h> |
| #include <linux/platform_device.h> |
| #include <linux/delay.h> |
| #include <linux/interrupt.h> |
| #include <linux/dma-mapping.h> |
| #include <linux/dmaengine.h> |
| #include <linux/highmem.h> |
| #include <linux/clk.h> |
| #include <linux/err.h> |
| #include <linux/completion.h> |
| #include <linux/mmc/host.h> |
| #include <linux/mmc/mmc.h> |
| #include <linux/mmc/sdio.h> |
| #include <linux/gpio.h> |
| #include <linux/regulator/consumer.h> |
| #include <linux/module.h> |
| |
| #include <mach/mxs.h> |
| #include <mach/common.h> |
| #include <mach/dma.h> |
| #include <mach/mmc.h> |
| |
| #define DRIVER_NAME "mxs-mmc" |
| |
| /* card detect polling timeout */ |
| #define MXS_MMC_DETECT_TIMEOUT (HZ/2) |
| |
| #define SSP_VERSION_LATEST 4 |
| #define ssp_is_old() (host->version < SSP_VERSION_LATEST) |
| |
| /* SSP registers */ |
| #define HW_SSP_CTRL0 0x000 |
| #define BM_SSP_CTRL0_RUN (1 << 29) |
| #define BM_SSP_CTRL0_SDIO_IRQ_CHECK (1 << 28) |
| #define BM_SSP_CTRL0_IGNORE_CRC (1 << 26) |
| #define BM_SSP_CTRL0_READ (1 << 25) |
| #define BM_SSP_CTRL0_DATA_XFER (1 << 24) |
| #define BP_SSP_CTRL0_BUS_WIDTH (22) |
| #define BM_SSP_CTRL0_BUS_WIDTH (0x3 << 22) |
| #define BM_SSP_CTRL0_WAIT_FOR_IRQ (1 << 21) |
| #define BM_SSP_CTRL0_LONG_RESP (1 << 19) |
| #define BM_SSP_CTRL0_GET_RESP (1 << 17) |
| #define BM_SSP_CTRL0_ENABLE (1 << 16) |
| #define BP_SSP_CTRL0_XFER_COUNT (0) |
| #define BM_SSP_CTRL0_XFER_COUNT (0xffff) |
| #define HW_SSP_CMD0 0x010 |
| #define BM_SSP_CMD0_DBL_DATA_RATE_EN (1 << 25) |
| #define BM_SSP_CMD0_SLOW_CLKING_EN (1 << 22) |
| #define BM_SSP_CMD0_CONT_CLKING_EN (1 << 21) |
| #define BM_SSP_CMD0_APPEND_8CYC (1 << 20) |
| #define BP_SSP_CMD0_BLOCK_SIZE (16) |
| #define BM_SSP_CMD0_BLOCK_SIZE (0xf << 16) |
| #define BP_SSP_CMD0_BLOCK_COUNT (8) |
| #define BM_SSP_CMD0_BLOCK_COUNT (0xff << 8) |
| #define BP_SSP_CMD0_CMD (0) |
| #define BM_SSP_CMD0_CMD (0xff) |
| #define HW_SSP_CMD1 0x020 |
| #define HW_SSP_XFER_SIZE 0x030 |
| #define HW_SSP_BLOCK_SIZE 0x040 |
| #define BP_SSP_BLOCK_SIZE_BLOCK_COUNT (4) |
| #define BM_SSP_BLOCK_SIZE_BLOCK_COUNT (0xffffff << 4) |
| #define BP_SSP_BLOCK_SIZE_BLOCK_SIZE (0) |
| #define BM_SSP_BLOCK_SIZE_BLOCK_SIZE (0xf) |
| #define HW_SSP_TIMING (ssp_is_old() ? 0x050 : 0x070) |
| #define BP_SSP_TIMING_TIMEOUT (16) |
| #define BM_SSP_TIMING_TIMEOUT (0xffff << 16) |
| #define BP_SSP_TIMING_CLOCK_DIVIDE (8) |
| #define BM_SSP_TIMING_CLOCK_DIVIDE (0xff << 8) |
| #define BP_SSP_TIMING_CLOCK_RATE (0) |
| #define BM_SSP_TIMING_CLOCK_RATE (0xff) |
| #define HW_SSP_CTRL1 (ssp_is_old() ? 0x060 : 0x080) |
| #define BM_SSP_CTRL1_SDIO_IRQ (1 << 31) |
| #define BM_SSP_CTRL1_SDIO_IRQ_EN (1 << 30) |
| #define BM_SSP_CTRL1_RESP_ERR_IRQ (1 << 29) |
| #define BM_SSP_CTRL1_RESP_ERR_IRQ_EN (1 << 28) |
| #define BM_SSP_CTRL1_RESP_TIMEOUT_IRQ (1 << 27) |
| #define BM_SSP_CTRL1_RESP_TIMEOUT_IRQ_EN (1 << 26) |
| #define BM_SSP_CTRL1_DATA_TIMEOUT_IRQ (1 << 25) |
| #define BM_SSP_CTRL1_DATA_TIMEOUT_IRQ_EN (1 << 24) |
| #define BM_SSP_CTRL1_DATA_CRC_IRQ (1 << 23) |
| #define BM_SSP_CTRL1_DATA_CRC_IRQ_EN (1 << 22) |
| #define BM_SSP_CTRL1_FIFO_UNDERRUN_IRQ (1 << 21) |
| #define BM_SSP_CTRL1_FIFO_UNDERRUN_IRQ_EN (1 << 20) |
| #define BM_SSP_CTRL1_RECV_TIMEOUT_IRQ (1 << 17) |
| #define BM_SSP_CTRL1_RECV_TIMEOUT_IRQ_EN (1 << 16) |
| #define BM_SSP_CTRL1_FIFO_OVERRUN_IRQ (1 << 15) |
| #define BM_SSP_CTRL1_FIFO_OVERRUN_IRQ_EN (1 << 14) |
| #define BM_SSP_CTRL1_DMA_ENABLE (1 << 13) |
| #define BM_SSP_CTRL1_POLARITY (1 << 9) |
| #define BP_SSP_CTRL1_WORD_LENGTH (4) |
| #define BM_SSP_CTRL1_WORD_LENGTH (0xf << 4) |
| #define BP_SSP_CTRL1_SSP_MODE (0) |
| #define BM_SSP_CTRL1_SSP_MODE (0xf) |
| #define HW_SSP_SDRESP0 (ssp_is_old() ? 0x080 : 0x0a0) |
| #define HW_SSP_SDRESP1 (ssp_is_old() ? 0x090 : 0x0b0) |
| #define HW_SSP_SDRESP2 (ssp_is_old() ? 0x0a0 : 0x0c0) |
| #define HW_SSP_SDRESP3 (ssp_is_old() ? 0x0b0 : 0x0d0) |
| #define HW_SSP_STATUS (ssp_is_old() ? 0x0c0 : 0x100) |
| #define BM_SSP_STATUS_CARD_DETECT (1 << 28) |
| #define BM_SSP_STATUS_SDIO_IRQ (1 << 17) |
| #define HW_SSP_VERSION (cpu_is_mx23() ? 0x110 : 0x130) |
| #define BP_SSP_VERSION_MAJOR (24) |
| |
| #define BF_SSP(value, field) (((value) << BP_SSP_##field) & BM_SSP_##field) |
| |
| #define MXS_MMC_IRQ_BITS (BM_SSP_CTRL1_SDIO_IRQ | \ |
| BM_SSP_CTRL1_RESP_ERR_IRQ | \ |
| BM_SSP_CTRL1_RESP_TIMEOUT_IRQ | \ |
| BM_SSP_CTRL1_DATA_TIMEOUT_IRQ | \ |
| BM_SSP_CTRL1_DATA_CRC_IRQ | \ |
| BM_SSP_CTRL1_FIFO_UNDERRUN_IRQ | \ |
| BM_SSP_CTRL1_RECV_TIMEOUT_IRQ | \ |
| BM_SSP_CTRL1_FIFO_OVERRUN_IRQ) |
| |
| #define SSP_PIO_NUM 3 |
| |
| struct mxs_mmc_host { |
| struct mmc_host *mmc; |
| struct mmc_request *mrq; |
| struct mmc_command *cmd; |
| struct mmc_data *data; |
| |
| void __iomem *base; |
| int irq; |
| struct resource *res; |
| struct resource *dma_res; |
| struct clk *clk; |
| unsigned int clk_rate; |
| |
| struct dma_chan *dmach; |
| struct mxs_dma_data dma_data; |
| unsigned int dma_dir; |
| u32 ssp_pio_words[SSP_PIO_NUM]; |
| |
| unsigned int version; |
| unsigned char bus_width; |
| spinlock_t lock; |
| int sdio_irq_en; |
| }; |
| |
| static int mxs_mmc_get_ro(struct mmc_host *mmc) |
| { |
| struct mxs_mmc_host *host = mmc_priv(mmc); |
| struct mxs_mmc_platform_data *pdata = |
| mmc_dev(host->mmc)->platform_data; |
| |
| if (!pdata) |
| return -EFAULT; |
| |
| if (!gpio_is_valid(pdata->wp_gpio)) |
| return -EINVAL; |
| |
| return gpio_get_value(pdata->wp_gpio); |
| } |
| |
| static int mxs_mmc_get_cd(struct mmc_host *mmc) |
| { |
| struct mxs_mmc_host *host = mmc_priv(mmc); |
| |
| return !(readl(host->base + HW_SSP_STATUS) & |
| BM_SSP_STATUS_CARD_DETECT); |
| } |
| |
| static void mxs_mmc_reset(struct mxs_mmc_host *host) |
| { |
| u32 ctrl0, ctrl1; |
| |
| mxs_reset_block(host->base); |
| |
| ctrl0 = BM_SSP_CTRL0_IGNORE_CRC; |
| ctrl1 = BF_SSP(0x3, CTRL1_SSP_MODE) | |
| BF_SSP(0x7, CTRL1_WORD_LENGTH) | |
| BM_SSP_CTRL1_DMA_ENABLE | |
| BM_SSP_CTRL1_POLARITY | |
| BM_SSP_CTRL1_RECV_TIMEOUT_IRQ_EN | |
| BM_SSP_CTRL1_DATA_CRC_IRQ_EN | |
| BM_SSP_CTRL1_DATA_TIMEOUT_IRQ_EN | |
| BM_SSP_CTRL1_RESP_TIMEOUT_IRQ_EN | |
| BM_SSP_CTRL1_RESP_ERR_IRQ_EN; |
| |
| writel(BF_SSP(0xffff, TIMING_TIMEOUT) | |
| BF_SSP(2, TIMING_CLOCK_DIVIDE) | |
| BF_SSP(0, TIMING_CLOCK_RATE), |
| host->base + HW_SSP_TIMING); |
| |
| if (host->sdio_irq_en) { |
| ctrl0 |= BM_SSP_CTRL0_SDIO_IRQ_CHECK; |
| ctrl1 |= BM_SSP_CTRL1_SDIO_IRQ_EN; |
| } |
| |
| writel(ctrl0, host->base + HW_SSP_CTRL0); |
| writel(ctrl1, host->base + HW_SSP_CTRL1); |
| } |
| |
| static void mxs_mmc_start_cmd(struct mxs_mmc_host *host, |
| struct mmc_command *cmd); |
| |
| static void mxs_mmc_request_done(struct mxs_mmc_host *host) |
| { |
| struct mmc_command *cmd = host->cmd; |
| struct mmc_data *data = host->data; |
| struct mmc_request *mrq = host->mrq; |
| |
| if (mmc_resp_type(cmd) & MMC_RSP_PRESENT) { |
| if (mmc_resp_type(cmd) & MMC_RSP_136) { |
| cmd->resp[3] = readl(host->base + HW_SSP_SDRESP0); |
| cmd->resp[2] = readl(host->base + HW_SSP_SDRESP1); |
| cmd->resp[1] = readl(host->base + HW_SSP_SDRESP2); |
| cmd->resp[0] = readl(host->base + HW_SSP_SDRESP3); |
| } else { |
| cmd->resp[0] = readl(host->base + HW_SSP_SDRESP0); |
| } |
| } |
| |
| if (data) { |
| dma_unmap_sg(mmc_dev(host->mmc), data->sg, |
| data->sg_len, host->dma_dir); |
| /* |
| * If there was an error on any block, we mark all |
| * data blocks as being in error. |
| */ |
| if (!data->error) |
| data->bytes_xfered = data->blocks * data->blksz; |
| else |
| data->bytes_xfered = 0; |
| |
| host->data = NULL; |
| if (mrq->stop) { |
| mxs_mmc_start_cmd(host, mrq->stop); |
| return; |
| } |
| } |
| |
| host->mrq = NULL; |
| mmc_request_done(host->mmc, mrq); |
| } |
| |
| static void mxs_mmc_dma_irq_callback(void *param) |
| { |
| struct mxs_mmc_host *host = param; |
| |
| mxs_mmc_request_done(host); |
| } |
| |
| static irqreturn_t mxs_mmc_irq_handler(int irq, void *dev_id) |
| { |
| struct mxs_mmc_host *host = dev_id; |
| struct mmc_command *cmd = host->cmd; |
| struct mmc_data *data = host->data; |
| u32 stat; |
| |
| spin_lock(&host->lock); |
| |
| stat = readl(host->base + HW_SSP_CTRL1); |
| writel(stat & MXS_MMC_IRQ_BITS, |
| host->base + HW_SSP_CTRL1 + MXS_CLR_ADDR); |
| |
| if ((stat & BM_SSP_CTRL1_SDIO_IRQ) && (stat & BM_SSP_CTRL1_SDIO_IRQ_EN)) |
| mmc_signal_sdio_irq(host->mmc); |
| |
| spin_unlock(&host->lock); |
| |
| if (stat & BM_SSP_CTRL1_RESP_TIMEOUT_IRQ) |
| cmd->error = -ETIMEDOUT; |
| else if (stat & BM_SSP_CTRL1_RESP_ERR_IRQ) |
| cmd->error = -EIO; |
| |
| if (data) { |
| if (stat & (BM_SSP_CTRL1_DATA_TIMEOUT_IRQ | |
| BM_SSP_CTRL1_RECV_TIMEOUT_IRQ)) |
| data->error = -ETIMEDOUT; |
| else if (stat & BM_SSP_CTRL1_DATA_CRC_IRQ) |
| data->error = -EILSEQ; |
| else if (stat & (BM_SSP_CTRL1_FIFO_UNDERRUN_IRQ | |
| BM_SSP_CTRL1_FIFO_OVERRUN_IRQ)) |
| data->error = -EIO; |
| } |
| |
| return IRQ_HANDLED; |
| } |
| |
| static struct dma_async_tx_descriptor *mxs_mmc_prep_dma( |
| struct mxs_mmc_host *host, unsigned int append) |
| { |
| struct dma_async_tx_descriptor *desc; |
| struct mmc_data *data = host->data; |
| struct scatterlist * sgl; |
| unsigned int sg_len; |
| |
| if (data) { |
| /* data */ |
| dma_map_sg(mmc_dev(host->mmc), data->sg, |
| data->sg_len, host->dma_dir); |
| sgl = data->sg; |
| sg_len = data->sg_len; |
| } else { |
| /* pio */ |
| sgl = (struct scatterlist *) host->ssp_pio_words; |
| sg_len = SSP_PIO_NUM; |
| } |
| |
| desc = host->dmach->device->device_prep_slave_sg(host->dmach, |
| sgl, sg_len, host->dma_dir, append); |
| if (desc) { |
| desc->callback = mxs_mmc_dma_irq_callback; |
| desc->callback_param = host; |
| } else { |
| if (data) |
| dma_unmap_sg(mmc_dev(host->mmc), data->sg, |
| data->sg_len, host->dma_dir); |
| } |
| |
| return desc; |
| } |
| |
| static void mxs_mmc_bc(struct mxs_mmc_host *host) |
| { |
| struct mmc_command *cmd = host->cmd; |
| struct dma_async_tx_descriptor *desc; |
| u32 ctrl0, cmd0, cmd1; |
| |
| ctrl0 = BM_SSP_CTRL0_ENABLE | BM_SSP_CTRL0_IGNORE_CRC; |
| cmd0 = BF_SSP(cmd->opcode, CMD0_CMD) | BM_SSP_CMD0_APPEND_8CYC; |
| cmd1 = cmd->arg; |
| |
| if (host->sdio_irq_en) { |
| ctrl0 |= BM_SSP_CTRL0_SDIO_IRQ_CHECK; |
| cmd0 |= BM_SSP_CMD0_CONT_CLKING_EN | BM_SSP_CMD0_SLOW_CLKING_EN; |
| } |
| |
| host->ssp_pio_words[0] = ctrl0; |
| host->ssp_pio_words[1] = cmd0; |
| host->ssp_pio_words[2] = cmd1; |
| host->dma_dir = DMA_NONE; |
| desc = mxs_mmc_prep_dma(host, 0); |
| if (!desc) |
| goto out; |
| |
| dmaengine_submit(desc); |
| return; |
| |
| out: |
| dev_warn(mmc_dev(host->mmc), |
| "%s: failed to prep dma\n", __func__); |
| } |
| |
| static void mxs_mmc_ac(struct mxs_mmc_host *host) |
| { |
| struct mmc_command *cmd = host->cmd; |
| struct dma_async_tx_descriptor *desc; |
| u32 ignore_crc, get_resp, long_resp; |
| u32 ctrl0, cmd0, cmd1; |
| |
| ignore_crc = (mmc_resp_type(cmd) & MMC_RSP_CRC) ? |
| 0 : BM_SSP_CTRL0_IGNORE_CRC; |
| get_resp = (mmc_resp_type(cmd) & MMC_RSP_PRESENT) ? |
| BM_SSP_CTRL0_GET_RESP : 0; |
| long_resp = (mmc_resp_type(cmd) & MMC_RSP_136) ? |
| BM_SSP_CTRL0_LONG_RESP : 0; |
| |
| ctrl0 = BM_SSP_CTRL0_ENABLE | ignore_crc | get_resp | long_resp; |
| cmd0 = BF_SSP(cmd->opcode, CMD0_CMD); |
| cmd1 = cmd->arg; |
| |
| if (host->sdio_irq_en) { |
| ctrl0 |= BM_SSP_CTRL0_SDIO_IRQ_CHECK; |
| cmd0 |= BM_SSP_CMD0_CONT_CLKING_EN | BM_SSP_CMD0_SLOW_CLKING_EN; |
| } |
| |
| host->ssp_pio_words[0] = ctrl0; |
| host->ssp_pio_words[1] = cmd0; |
| host->ssp_pio_words[2] = cmd1; |
| host->dma_dir = DMA_NONE; |
| desc = mxs_mmc_prep_dma(host, 0); |
| if (!desc) |
| goto out; |
| |
| dmaengine_submit(desc); |
| return; |
| |
| out: |
| dev_warn(mmc_dev(host->mmc), |
| "%s: failed to prep dma\n", __func__); |
| } |
| |
| static unsigned short mxs_ns_to_ssp_ticks(unsigned clock_rate, unsigned ns) |
| { |
| const unsigned int ssp_timeout_mul = 4096; |
| /* |
| * Calculate ticks in ms since ns are large numbers |
| * and might overflow |
| */ |
| const unsigned int clock_per_ms = clock_rate / 1000; |
| const unsigned int ms = ns / 1000; |
| const unsigned int ticks = ms * clock_per_ms; |
| const unsigned int ssp_ticks = ticks / ssp_timeout_mul; |
| |
| WARN_ON(ssp_ticks == 0); |
| return ssp_ticks; |
| } |
| |
| static void mxs_mmc_adtc(struct mxs_mmc_host *host) |
| { |
| struct mmc_command *cmd = host->cmd; |
| struct mmc_data *data = cmd->data; |
| struct dma_async_tx_descriptor *desc; |
| struct scatterlist *sgl = data->sg, *sg; |
| unsigned int sg_len = data->sg_len; |
| int i; |
| |
| unsigned short dma_data_dir, timeout; |
| unsigned int data_size = 0, log2_blksz; |
| unsigned int blocks = data->blocks; |
| |
| u32 ignore_crc, get_resp, long_resp, read; |
| u32 ctrl0, cmd0, cmd1, val; |
| |
| ignore_crc = (mmc_resp_type(cmd) & MMC_RSP_CRC) ? |
| 0 : BM_SSP_CTRL0_IGNORE_CRC; |
| get_resp = (mmc_resp_type(cmd) & MMC_RSP_PRESENT) ? |
| BM_SSP_CTRL0_GET_RESP : 0; |
| long_resp = (mmc_resp_type(cmd) & MMC_RSP_136) ? |
| BM_SSP_CTRL0_LONG_RESP : 0; |
| |
| if (data->flags & MMC_DATA_WRITE) { |
| dma_data_dir = DMA_TO_DEVICE; |
| read = 0; |
| } else { |
| dma_data_dir = DMA_FROM_DEVICE; |
| read = BM_SSP_CTRL0_READ; |
| } |
| |
| ctrl0 = BF_SSP(host->bus_width, CTRL0_BUS_WIDTH) | |
| ignore_crc | get_resp | long_resp | |
| BM_SSP_CTRL0_DATA_XFER | read | |
| BM_SSP_CTRL0_WAIT_FOR_IRQ | |
| BM_SSP_CTRL0_ENABLE; |
| |
| cmd0 = BF_SSP(cmd->opcode, CMD0_CMD); |
| |
| /* get logarithm to base 2 of block size for setting register */ |
| log2_blksz = ilog2(data->blksz); |
| |
| /* |
| * take special care of the case that data size from data->sg |
| * is not equal to blocks x blksz |
| */ |
| for_each_sg(sgl, sg, sg_len, i) |
| data_size += sg->length; |
| |
| if (data_size != data->blocks * data->blksz) |
| blocks = 1; |
| |
| /* xfer count, block size and count need to be set differently */ |
| if (ssp_is_old()) { |
| ctrl0 |= BF_SSP(data_size, CTRL0_XFER_COUNT); |
| cmd0 |= BF_SSP(log2_blksz, CMD0_BLOCK_SIZE) | |
| BF_SSP(blocks - 1, CMD0_BLOCK_COUNT); |
| } else { |
| writel(data_size, host->base + HW_SSP_XFER_SIZE); |
| writel(BF_SSP(log2_blksz, BLOCK_SIZE_BLOCK_SIZE) | |
| BF_SSP(blocks - 1, BLOCK_SIZE_BLOCK_COUNT), |
| host->base + HW_SSP_BLOCK_SIZE); |
| } |
| |
| if ((cmd->opcode == MMC_STOP_TRANSMISSION) || |
| (cmd->opcode == SD_IO_RW_EXTENDED)) |
| cmd0 |= BM_SSP_CMD0_APPEND_8CYC; |
| |
| cmd1 = cmd->arg; |
| |
| if (host->sdio_irq_en) { |
| ctrl0 |= BM_SSP_CTRL0_SDIO_IRQ_CHECK; |
| cmd0 |= BM_SSP_CMD0_CONT_CLKING_EN | BM_SSP_CMD0_SLOW_CLKING_EN; |
| } |
| |
| /* set the timeout count */ |
| timeout = mxs_ns_to_ssp_ticks(host->clk_rate, data->timeout_ns); |
| val = readl(host->base + HW_SSP_TIMING); |
| val &= ~(BM_SSP_TIMING_TIMEOUT); |
| val |= BF_SSP(timeout, TIMING_TIMEOUT); |
| writel(val, host->base + HW_SSP_TIMING); |
| |
| /* pio */ |
| host->ssp_pio_words[0] = ctrl0; |
| host->ssp_pio_words[1] = cmd0; |
| host->ssp_pio_words[2] = cmd1; |
| host->dma_dir = DMA_NONE; |
| desc = mxs_mmc_prep_dma(host, 0); |
| if (!desc) |
| goto out; |
| |
| /* append data sg */ |
| WARN_ON(host->data != NULL); |
| host->data = data; |
| host->dma_dir = dma_data_dir; |
| desc = mxs_mmc_prep_dma(host, 1); |
| if (!desc) |
| goto out; |
| |
| dmaengine_submit(desc); |
| return; |
| out: |
| dev_warn(mmc_dev(host->mmc), |
| "%s: failed to prep dma\n", __func__); |
| } |
| |
| static void mxs_mmc_start_cmd(struct mxs_mmc_host *host, |
| struct mmc_command *cmd) |
| { |
| host->cmd = cmd; |
| |
| switch (mmc_cmd_type(cmd)) { |
| case MMC_CMD_BC: |
| mxs_mmc_bc(host); |
| break; |
| case MMC_CMD_BCR: |
| mxs_mmc_ac(host); |
| break; |
| case MMC_CMD_AC: |
| mxs_mmc_ac(host); |
| break; |
| case MMC_CMD_ADTC: |
| mxs_mmc_adtc(host); |
| break; |
| default: |
| dev_warn(mmc_dev(host->mmc), |
| "%s: unknown MMC command\n", __func__); |
| break; |
| } |
| } |
| |
| static void mxs_mmc_request(struct mmc_host *mmc, struct mmc_request *mrq) |
| { |
| struct mxs_mmc_host *host = mmc_priv(mmc); |
| |
| WARN_ON(host->mrq != NULL); |
| host->mrq = mrq; |
| mxs_mmc_start_cmd(host, mrq->cmd); |
| } |
| |
| static void mxs_mmc_set_clk_rate(struct mxs_mmc_host *host, unsigned int rate) |
| { |
| unsigned int ssp_clk, ssp_sck; |
| u32 clock_divide, clock_rate; |
| u32 val; |
| |
| ssp_clk = clk_get_rate(host->clk); |
| |
| for (clock_divide = 2; clock_divide <= 254; clock_divide += 2) { |
| clock_rate = DIV_ROUND_UP(ssp_clk, rate * clock_divide); |
| clock_rate = (clock_rate > 0) ? clock_rate - 1 : 0; |
| if (clock_rate <= 255) |
| break; |
| } |
| |
| if (clock_divide > 254) { |
| dev_err(mmc_dev(host->mmc), |
| "%s: cannot set clock to %d\n", __func__, rate); |
| return; |
| } |
| |
| ssp_sck = ssp_clk / clock_divide / (1 + clock_rate); |
| |
| val = readl(host->base + HW_SSP_TIMING); |
| val &= ~(BM_SSP_TIMING_CLOCK_DIVIDE | BM_SSP_TIMING_CLOCK_RATE); |
| val |= BF_SSP(clock_divide, TIMING_CLOCK_DIVIDE); |
| val |= BF_SSP(clock_rate, TIMING_CLOCK_RATE); |
| writel(val, host->base + HW_SSP_TIMING); |
| |
| host->clk_rate = ssp_sck; |
| |
| dev_dbg(mmc_dev(host->mmc), |
| "%s: clock_divide %d, clock_rate %d, ssp_clk %d, rate_actual %d, rate_requested %d\n", |
| __func__, clock_divide, clock_rate, ssp_clk, ssp_sck, rate); |
| } |
| |
| static void mxs_mmc_set_ios(struct mmc_host *mmc, struct mmc_ios *ios) |
| { |
| struct mxs_mmc_host *host = mmc_priv(mmc); |
| |
| if (ios->bus_width == MMC_BUS_WIDTH_8) |
| host->bus_width = 2; |
| else if (ios->bus_width == MMC_BUS_WIDTH_4) |
| host->bus_width = 1; |
| else |
| host->bus_width = 0; |
| |
| if (ios->clock) |
| mxs_mmc_set_clk_rate(host, ios->clock); |
| } |
| |
| static void mxs_mmc_enable_sdio_irq(struct mmc_host *mmc, int enable) |
| { |
| struct mxs_mmc_host *host = mmc_priv(mmc); |
| unsigned long flags; |
| |
| spin_lock_irqsave(&host->lock, flags); |
| |
| host->sdio_irq_en = enable; |
| |
| if (enable) { |
| writel(BM_SSP_CTRL0_SDIO_IRQ_CHECK, |
| host->base + HW_SSP_CTRL0 + MXS_SET_ADDR); |
| writel(BM_SSP_CTRL1_SDIO_IRQ_EN, |
| host->base + HW_SSP_CTRL1 + MXS_SET_ADDR); |
| |
| if (readl(host->base + HW_SSP_STATUS) & BM_SSP_STATUS_SDIO_IRQ) |
| mmc_signal_sdio_irq(host->mmc); |
| |
| } else { |
| writel(BM_SSP_CTRL0_SDIO_IRQ_CHECK, |
| host->base + HW_SSP_CTRL0 + MXS_CLR_ADDR); |
| writel(BM_SSP_CTRL1_SDIO_IRQ_EN, |
| host->base + HW_SSP_CTRL1 + MXS_CLR_ADDR); |
| } |
| |
| spin_unlock_irqrestore(&host->lock, flags); |
| } |
| |
| static const struct mmc_host_ops mxs_mmc_ops = { |
| .request = mxs_mmc_request, |
| .get_ro = mxs_mmc_get_ro, |
| .get_cd = mxs_mmc_get_cd, |
| .set_ios = mxs_mmc_set_ios, |
| .enable_sdio_irq = mxs_mmc_enable_sdio_irq, |
| }; |
| |
| static bool mxs_mmc_dma_filter(struct dma_chan *chan, void *param) |
| { |
| struct mxs_mmc_host *host = param; |
| |
| if (!mxs_dma_is_apbh(chan)) |
| return false; |
| |
| if (chan->chan_id != host->dma_res->start) |
| return false; |
| |
| chan->private = &host->dma_data; |
| |
| return true; |
| } |
| |
| static int mxs_mmc_probe(struct platform_device *pdev) |
| { |
| struct mxs_mmc_host *host; |
| struct mmc_host *mmc; |
| struct resource *iores, *dmares, *r; |
| struct mxs_mmc_platform_data *pdata; |
| int ret = 0, irq_err, irq_dma; |
| dma_cap_mask_t mask; |
| |
| iores = platform_get_resource(pdev, IORESOURCE_MEM, 0); |
| dmares = platform_get_resource(pdev, IORESOURCE_DMA, 0); |
| irq_err = platform_get_irq(pdev, 0); |
| irq_dma = platform_get_irq(pdev, 1); |
| if (!iores || !dmares || irq_err < 0 || irq_dma < 0) |
| return -EINVAL; |
| |
| r = request_mem_region(iores->start, resource_size(iores), pdev->name); |
| if (!r) |
| return -EBUSY; |
| |
| mmc = mmc_alloc_host(sizeof(struct mxs_mmc_host), &pdev->dev); |
| if (!mmc) { |
| ret = -ENOMEM; |
| goto out_release_mem; |
| } |
| |
| host = mmc_priv(mmc); |
| host->base = ioremap(r->start, resource_size(r)); |
| if (!host->base) { |
| ret = -ENOMEM; |
| goto out_mmc_free; |
| } |
| |
| /* only major verion does matter */ |
| host->version = readl(host->base + HW_SSP_VERSION) >> |
| BP_SSP_VERSION_MAJOR; |
| |
| host->mmc = mmc; |
| host->res = r; |
| host->dma_res = dmares; |
| host->irq = irq_err; |
| host->sdio_irq_en = 0; |
| |
| host->clk = clk_get(&pdev->dev, NULL); |
| if (IS_ERR(host->clk)) { |
| ret = PTR_ERR(host->clk); |
| goto out_iounmap; |
| } |
| clk_prepare_enable(host->clk); |
| |
| mxs_mmc_reset(host); |
| |
| dma_cap_zero(mask); |
| dma_cap_set(DMA_SLAVE, mask); |
| host->dma_data.chan_irq = irq_dma; |
| host->dmach = dma_request_channel(mask, mxs_mmc_dma_filter, host); |
| if (!host->dmach) { |
| dev_err(mmc_dev(host->mmc), |
| "%s: failed to request dma\n", __func__); |
| goto out_clk_put; |
| } |
| |
| /* set mmc core parameters */ |
| mmc->ops = &mxs_mmc_ops; |
| mmc->caps = MMC_CAP_SD_HIGHSPEED | MMC_CAP_MMC_HIGHSPEED | |
| MMC_CAP_SDIO_IRQ | MMC_CAP_NEEDS_POLL; |
| |
| pdata = mmc_dev(host->mmc)->platform_data; |
| if (pdata) { |
| if (pdata->flags & SLOTF_8_BIT_CAPABLE) |
| mmc->caps |= MMC_CAP_4_BIT_DATA | MMC_CAP_8_BIT_DATA; |
| if (pdata->flags & SLOTF_4_BIT_CAPABLE) |
| mmc->caps |= MMC_CAP_4_BIT_DATA; |
| } |
| |
| mmc->f_min = 400000; |
| mmc->f_max = 288000000; |
| mmc->ocr_avail = MMC_VDD_32_33 | MMC_VDD_33_34; |
| |
| mmc->max_segs = 52; |
| mmc->max_blk_size = 1 << 0xf; |
| mmc->max_blk_count = (ssp_is_old()) ? 0xff : 0xffffff; |
| mmc->max_req_size = (ssp_is_old()) ? 0xffff : 0xffffffff; |
| mmc->max_seg_size = dma_get_max_seg_size(host->dmach->device->dev); |
| |
| platform_set_drvdata(pdev, mmc); |
| |
| ret = request_irq(host->irq, mxs_mmc_irq_handler, 0, DRIVER_NAME, host); |
| if (ret) |
| goto out_free_dma; |
| |
| spin_lock_init(&host->lock); |
| |
| ret = mmc_add_host(mmc); |
| if (ret) |
| goto out_free_irq; |
| |
| dev_info(mmc_dev(host->mmc), "initialized\n"); |
| |
| return 0; |
| |
| out_free_irq: |
| free_irq(host->irq, host); |
| out_free_dma: |
| if (host->dmach) |
| dma_release_channel(host->dmach); |
| out_clk_put: |
| clk_disable_unprepare(host->clk); |
| clk_put(host->clk); |
| out_iounmap: |
| iounmap(host->base); |
| out_mmc_free: |
| mmc_free_host(mmc); |
| out_release_mem: |
| release_mem_region(iores->start, resource_size(iores)); |
| return ret; |
| } |
| |
| static int mxs_mmc_remove(struct platform_device *pdev) |
| { |
| struct mmc_host *mmc = platform_get_drvdata(pdev); |
| struct mxs_mmc_host *host = mmc_priv(mmc); |
| struct resource *res = host->res; |
| |
| mmc_remove_host(mmc); |
| |
| free_irq(host->irq, host); |
| |
| platform_set_drvdata(pdev, NULL); |
| |
| if (host->dmach) |
| dma_release_channel(host->dmach); |
| |
| clk_disable_unprepare(host->clk); |
| clk_put(host->clk); |
| |
| iounmap(host->base); |
| |
| mmc_free_host(mmc); |
| |
| release_mem_region(res->start, resource_size(res)); |
| |
| return 0; |
| } |
| |
| #ifdef CONFIG_PM |
| static int mxs_mmc_suspend(struct device *dev) |
| { |
| struct mmc_host *mmc = dev_get_drvdata(dev); |
| struct mxs_mmc_host *host = mmc_priv(mmc); |
| int ret = 0; |
| |
| ret = mmc_suspend_host(mmc); |
| |
| clk_disable_unprepare(host->clk); |
| |
| return ret; |
| } |
| |
| static int mxs_mmc_resume(struct device *dev) |
| { |
| struct mmc_host *mmc = dev_get_drvdata(dev); |
| struct mxs_mmc_host *host = mmc_priv(mmc); |
| int ret = 0; |
| |
| clk_prepare_enable(host->clk); |
| |
| ret = mmc_resume_host(mmc); |
| |
| return ret; |
| } |
| |
| static const struct dev_pm_ops mxs_mmc_pm_ops = { |
| .suspend = mxs_mmc_suspend, |
| .resume = mxs_mmc_resume, |
| }; |
| #endif |
| |
| static struct platform_driver mxs_mmc_driver = { |
| .probe = mxs_mmc_probe, |
| .remove = mxs_mmc_remove, |
| .driver = { |
| .name = DRIVER_NAME, |
| .owner = THIS_MODULE, |
| #ifdef CONFIG_PM |
| .pm = &mxs_mmc_pm_ops, |
| #endif |
| }, |
| }; |
| |
| static int __init mxs_mmc_init(void) |
| { |
| return platform_driver_register(&mxs_mmc_driver); |
| } |
| |
| static void __exit mxs_mmc_exit(void) |
| { |
| platform_driver_unregister(&mxs_mmc_driver); |
| } |
| |
| module_init(mxs_mmc_init); |
| module_exit(mxs_mmc_exit); |
| |
| MODULE_DESCRIPTION("FREESCALE MXS MMC peripheral"); |
| MODULE_AUTHOR("Freescale Semiconductor"); |
| MODULE_LICENSE("GPL"); |