diff options
Diffstat (limited to 'drivers/mmc/host/davinci_mmc.c')
| -rw-r--r-- | drivers/mmc/host/davinci_mmc.c | 1430 |
1 files changed, 1430 insertions, 0 deletions
diff --git a/drivers/mmc/host/davinci_mmc.c b/drivers/mmc/host/davinci_mmc.c new file mode 100644 index 000000000..70d04962f --- /dev/null +++ b/drivers/mmc/host/davinci_mmc.c @@ -0,0 +1,1430 @@ +/* + * davinci_mmc.c - TI DaVinci MMC/SD/SDIO driver + * + * Copyright (C) 2006 Texas Instruments. + * Original author: Purushotam Kumar + * Copyright (C) 2009 David Brownell + * + * 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., 675 Mass Ave, Cambridge, MA 02139, USA. + */ + +#include <linux/module.h> +#include <linux/ioport.h> +#include <linux/platform_device.h> +#include <linux/clk.h> +#include <linux/err.h> +#include <linux/cpufreq.h> +#include <linux/mmc/host.h> +#include <linux/io.h> +#include <linux/irq.h> +#include <linux/delay.h> +#include <linux/dmaengine.h> +#include <linux/dma-mapping.h> +#include <linux/mmc/mmc.h> +#include <linux/of.h> +#include <linux/of_device.h> +#include <linux/mmc/slot-gpio.h> +#include <linux/interrupt.h> + +#include <linux/platform_data/mmc-davinci.h> + +/* + * Register Definitions + */ +#define DAVINCI_MMCCTL 0x00 /* Control Register */ +#define DAVINCI_MMCCLK 0x04 /* Memory Clock Control Register */ +#define DAVINCI_MMCST0 0x08 /* Status Register 0 */ +#define DAVINCI_MMCST1 0x0C /* Status Register 1 */ +#define DAVINCI_MMCIM 0x10 /* Interrupt Mask Register */ +#define DAVINCI_MMCTOR 0x14 /* Response Time-Out Register */ +#define DAVINCI_MMCTOD 0x18 /* Data Read Time-Out Register */ +#define DAVINCI_MMCBLEN 0x1C /* Block Length Register */ +#define DAVINCI_MMCNBLK 0x20 /* Number of Blocks Register */ +#define DAVINCI_MMCNBLC 0x24 /* Number of Blocks Counter Register */ +#define DAVINCI_MMCDRR 0x28 /* Data Receive Register */ +#define DAVINCI_MMCDXR 0x2C /* Data Transmit Register */ +#define DAVINCI_MMCCMD 0x30 /* Command Register */ +#define DAVINCI_MMCARGHL 0x34 /* Argument Register */ +#define DAVINCI_MMCRSP01 0x38 /* Response Register 0 and 1 */ +#define DAVINCI_MMCRSP23 0x3C /* Response Register 0 and 1 */ +#define DAVINCI_MMCRSP45 0x40 /* Response Register 0 and 1 */ +#define DAVINCI_MMCRSP67 0x44 /* Response Register 0 and 1 */ +#define DAVINCI_MMCDRSP 0x48 /* Data Response Register */ +#define DAVINCI_MMCETOK 0x4C +#define DAVINCI_MMCCIDX 0x50 /* Command Index Register */ +#define DAVINCI_MMCCKC 0x54 +#define DAVINCI_MMCTORC 0x58 +#define DAVINCI_MMCTODC 0x5C +#define DAVINCI_MMCBLNC 0x60 +#define DAVINCI_SDIOCTL 0x64 +#define DAVINCI_SDIOST0 0x68 +#define DAVINCI_SDIOIEN 0x6C +#define DAVINCI_SDIOIST 0x70 +#define DAVINCI_MMCFIFOCTL 0x74 /* FIFO Control Register */ + +/* DAVINCI_MMCCTL definitions */ +#define MMCCTL_DATRST (1 << 0) +#define MMCCTL_CMDRST (1 << 1) +#define MMCCTL_WIDTH_8_BIT (1 << 8) +#define MMCCTL_WIDTH_4_BIT (1 << 2) +#define MMCCTL_DATEG_DISABLED (0 << 6) +#define MMCCTL_DATEG_RISING (1 << 6) +#define MMCCTL_DATEG_FALLING (2 << 6) +#define MMCCTL_DATEG_BOTH (3 << 6) +#define MMCCTL_PERMDR_LE (0 << 9) +#define MMCCTL_PERMDR_BE (1 << 9) +#define MMCCTL_PERMDX_LE (0 << 10) +#define MMCCTL_PERMDX_BE (1 << 10) + +/* DAVINCI_MMCCLK definitions */ +#define MMCCLK_CLKEN (1 << 8) +#define MMCCLK_CLKRT_MASK (0xFF << 0) + +/* IRQ bit definitions, for DAVINCI_MMCST0 and DAVINCI_MMCIM */ +#define MMCST0_DATDNE BIT(0) /* data done */ +#define MMCST0_BSYDNE BIT(1) /* busy done */ +#define MMCST0_RSPDNE BIT(2) /* command done */ +#define MMCST0_TOUTRD BIT(3) /* data read timeout */ +#define MMCST0_TOUTRS BIT(4) /* command response timeout */ +#define MMCST0_CRCWR BIT(5) /* data write CRC error */ +#define MMCST0_CRCRD BIT(6) /* data read CRC error */ +#define MMCST0_CRCRS BIT(7) /* command response CRC error */ +#define MMCST0_DXRDY BIT(9) /* data transmit ready (fifo empty) */ +#define MMCST0_DRRDY BIT(10) /* data receive ready (data in fifo)*/ +#define MMCST0_DATED BIT(11) /* DAT3 edge detect */ +#define MMCST0_TRNDNE BIT(12) /* transfer done */ + +/* DAVINCI_MMCST1 definitions */ +#define MMCST1_BUSY (1 << 0) + +/* DAVINCI_MMCCMD definitions */ +#define MMCCMD_CMD_MASK (0x3F << 0) +#define MMCCMD_PPLEN (1 << 7) +#define MMCCMD_BSYEXP (1 << 8) +#define MMCCMD_RSPFMT_MASK (3 << 9) +#define MMCCMD_RSPFMT_NONE (0 << 9) +#define MMCCMD_RSPFMT_R1456 (1 << 9) +#define MMCCMD_RSPFMT_R2 (2 << 9) +#define MMCCMD_RSPFMT_R3 (3 << 9) +#define MMCCMD_DTRW (1 << 11) +#define MMCCMD_STRMTP (1 << 12) +#define MMCCMD_WDATX (1 << 13) +#define MMCCMD_INITCK (1 << 14) +#define MMCCMD_DCLR (1 << 15) +#define MMCCMD_DMATRIG (1 << 16) + +/* DAVINCI_MMCFIFOCTL definitions */ +#define MMCFIFOCTL_FIFORST (1 << 0) +#define MMCFIFOCTL_FIFODIR_WR (1 << 1) +#define MMCFIFOCTL_FIFODIR_RD (0 << 1) +#define MMCFIFOCTL_FIFOLEV (1 << 2) /* 0 = 128 bits, 1 = 256 bits */ +#define MMCFIFOCTL_ACCWD_4 (0 << 3) /* access width of 4 bytes */ +#define MMCFIFOCTL_ACCWD_3 (1 << 3) /* access width of 3 bytes */ +#define MMCFIFOCTL_ACCWD_2 (2 << 3) /* access width of 2 bytes */ +#define MMCFIFOCTL_ACCWD_1 (3 << 3) /* access width of 1 byte */ + +/* DAVINCI_SDIOST0 definitions */ +#define SDIOST0_DAT1_HI BIT(0) + +/* DAVINCI_SDIOIEN definitions */ +#define SDIOIEN_IOINTEN BIT(0) + +/* DAVINCI_SDIOIST definitions */ +#define SDIOIST_IOINT BIT(0) + +/* MMCSD Init clock in Hz in opendrain mode */ +#define MMCSD_INIT_CLOCK 200000 + +/* + * One scatterlist dma "segment" is at most MAX_CCNT rw_threshold units, + * and we handle up to MAX_NR_SG segments. MMC_BLOCK_BOUNCE kicks in only + * for drivers with max_segs == 1, making the segments bigger (64KB) + * than the page or two that's otherwise typical. nr_sg (passed from + * platform data) == 16 gives at least the same throughput boost, using + * EDMA transfer linkage instead of spending CPU time copying pages. + */ +#define MAX_CCNT ((1 << 16) - 1) + +#define MAX_NR_SG 16 + +static unsigned rw_threshold = 32; +module_param(rw_threshold, uint, S_IRUGO); +MODULE_PARM_DESC(rw_threshold, + "Read/Write threshold. Default = 32"); + +static unsigned poll_threshold = 128; +module_param(poll_threshold, uint, S_IRUGO); +MODULE_PARM_DESC(poll_threshold, + "Polling transaction size threshold. Default = 128"); + +static unsigned poll_loopcount = 32; +module_param(poll_loopcount, uint, S_IRUGO); +MODULE_PARM_DESC(poll_loopcount, + "Maximum polling loop count. Default = 32"); + +static unsigned use_dma = 1; +module_param(use_dma, uint, 0); +MODULE_PARM_DESC(use_dma, "Whether to use DMA or not. Default = 1"); + +struct mmc_davinci_host { + struct mmc_command *cmd; + struct mmc_data *data; + struct mmc_host *mmc; + struct clk *clk; + unsigned int mmc_input_clk; + void __iomem *base; + struct resource *mem_res; + int mmc_irq, sdio_irq; + unsigned char bus_mode; + +#define DAVINCI_MMC_DATADIR_NONE 0 +#define DAVINCI_MMC_DATADIR_READ 1 +#define DAVINCI_MMC_DATADIR_WRITE 2 + unsigned char data_dir; + + /* buffer is used during PIO of one scatterlist segment, and + * is updated along with buffer_bytes_left. bytes_left applies + * to all N blocks of the PIO transfer. + */ + u8 *buffer; + u32 buffer_bytes_left; + u32 bytes_left; + + struct dma_chan *dma_tx; + struct dma_chan *dma_rx; + bool use_dma; + bool do_dma; + bool sdio_int; + bool active_request; + + /* For PIO we walk scatterlists one segment at a time. */ + unsigned int sg_len; + struct scatterlist *sg; + + /* Version of the MMC/SD controller */ + u8 version; + /* for ns in one cycle calculation */ + unsigned ns_in_one_cycle; + /* Number of sg segments */ + u8 nr_sg; +#ifdef CONFIG_CPU_FREQ + struct notifier_block freq_transition; +#endif +}; + +static irqreturn_t mmc_davinci_irq(int irq, void *dev_id); + +/* PIO only */ +static void mmc_davinci_sg_to_buf(struct mmc_davinci_host *host) +{ + host->buffer_bytes_left = sg_dma_len(host->sg); + host->buffer = sg_virt(host->sg); + if (host->buffer_bytes_left > host->bytes_left) + host->buffer_bytes_left = host->bytes_left; +} + +static void davinci_fifo_data_trans(struct mmc_davinci_host *host, + unsigned int n) +{ + u8 *p; + unsigned int i; + + if (host->buffer_bytes_left == 0) { + host->sg = sg_next(host->data->sg); + mmc_davinci_sg_to_buf(host); + } + + p = host->buffer; + if (n > host->buffer_bytes_left) + n = host->buffer_bytes_left; + host->buffer_bytes_left -= n; + host->bytes_left -= n; + + /* NOTE: we never transfer more than rw_threshold bytes + * to/from the fifo here; there's no I/O overlap. + * This also assumes that access width( i.e. ACCWD) is 4 bytes + */ + if (host->data_dir == DAVINCI_MMC_DATADIR_WRITE) { + for (i = 0; i < (n >> 2); i++) { + writel(*((u32 *)p), host->base + DAVINCI_MMCDXR); + p = p + 4; + } + if (n & 3) { + iowrite8_rep(host->base + DAVINCI_MMCDXR, p, (n & 3)); + p = p + (n & 3); + } + } else { + for (i = 0; i < (n >> 2); i++) { + *((u32 *)p) = readl(host->base + DAVINCI_MMCDRR); + p = p + 4; + } + if (n & 3) { + ioread8_rep(host->base + DAVINCI_MMCDRR, p, (n & 3)); + p = p + (n & 3); + } + } + host->buffer = p; +} + +static void mmc_davinci_start_command(struct mmc_davinci_host *host, + struct mmc_command *cmd) +{ + u32 cmd_reg = 0; + u32 im_val; + + dev_dbg(mmc_dev(host->mmc), "CMD%d, arg 0x%08x%s\n", + cmd->opcode, cmd->arg, + ({ char *s; + switch (mmc_resp_type(cmd)) { + case MMC_RSP_R1: + s = ", R1/R5/R6/R7 response"; + break; + case MMC_RSP_R1B: + s = ", R1b response"; + break; + case MMC_RSP_R2: + s = ", R2 response"; + break; + case MMC_RSP_R3: + s = ", R3/R4 response"; + break; + default: + s = ", (R? response)"; + break; + }; s; })); + host->cmd = cmd; + + switch (mmc_resp_type(cmd)) { + case MMC_RSP_R1B: + /* There's some spec confusion about when R1B is + * allowed, but if the card doesn't issue a BUSY + * then it's harmless for us to allow it. + */ + cmd_reg |= MMCCMD_BSYEXP; + /* FALLTHROUGH */ + case MMC_RSP_R1: /* 48 bits, CRC */ + cmd_reg |= MMCCMD_RSPFMT_R1456; + break; + case MMC_RSP_R2: /* 136 bits, CRC */ + cmd_reg |= MMCCMD_RSPFMT_R2; + break; + case MMC_RSP_R3: /* 48 bits, no CRC */ + cmd_reg |= MMCCMD_RSPFMT_R3; + break; + default: + cmd_reg |= MMCCMD_RSPFMT_NONE; + dev_dbg(mmc_dev(host->mmc), "unknown resp_type %04x\n", + mmc_resp_type(cmd)); + break; + } + + /* Set command index */ + cmd_reg |= cmd->opcode; + + /* Enable EDMA transfer triggers */ + if (host->do_dma) + cmd_reg |= MMCCMD_DMATRIG; + + if (host->version == MMC_CTLR_VERSION_2 && host->data != NULL && + host->data_dir == DAVINCI_MMC_DATADIR_READ) + cmd_reg |= MMCCMD_DMATRIG; + + /* Setting whether command involves data transfer or not */ + if (cmd->data) + cmd_reg |= MMCCMD_WDATX; + + /* Setting whether data read or write */ + if (host->data_dir == DAVINCI_MMC_DATADIR_WRITE) + cmd_reg |= MMCCMD_DTRW; + + if (host->bus_mode == MMC_BUSMODE_PUSHPULL) + cmd_reg |= MMCCMD_PPLEN; + + /* set Command timeout */ + writel(0x1FFF, host->base + DAVINCI_MMCTOR); + + /* Enable interrupt (calculate here, defer until FIFO is stuffed). */ + im_val = MMCST0_RSPDNE | MMCST0_CRCRS | MMCST0_TOUTRS; + if (host->data_dir == DAVINCI_MMC_DATADIR_WRITE) { + im_val |= MMCST0_DATDNE | MMCST0_CRCWR; + + if (!host->do_dma) + im_val |= MMCST0_DXRDY; + } else if (host->data_dir == DAVINCI_MMC_DATADIR_READ) { + im_val |= MMCST0_DATDNE | MMCST0_CRCRD | MMCST0_TOUTRD; + + if (!host->do_dma) + im_val |= MMCST0_DRRDY; + } + + /* + * Before non-DMA WRITE commands the controller needs priming: + * FIFO should be populated with 32 bytes i.e. whatever is the FIFO size + */ + if (!host->do_dma && (host->data_dir == DAVINCI_MMC_DATADIR_WRITE)) + davinci_fifo_data_trans(host, rw_threshold); + + writel(cmd->arg, host->base + DAVINCI_MMCARGHL); + writel(cmd_reg, host->base + DAVINCI_MMCCMD); + + host->active_request = true; + + if (!host->do_dma && host->bytes_left <= poll_threshold) { + u32 count = poll_loopcount; + + while (host->active_request && count--) { + mmc_davinci_irq(0, host); + cpu_relax(); + } + } + + if (host->active_request) + writel(im_val, host->base + DAVINCI_MMCIM); +} + +/*----------------------------------------------------------------------*/ + +/* DMA infrastructure */ + +static void davinci_abort_dma(struct mmc_davinci_host *host) +{ + struct dma_chan *sync_dev; + + if (host->data_dir == DAVINCI_MMC_DATADIR_READ) + sync_dev = host->dma_rx; + else + sync_dev = host->dma_tx; + + dmaengine_terminate_all(sync_dev); +} + +static int mmc_davinci_send_dma_request(struct mmc_davinci_host *host, + struct mmc_data *data) +{ + struct dma_chan *chan; + struct dma_async_tx_descriptor *desc; + int ret = 0; + + if (host->data_dir == DAVINCI_MMC_DATADIR_WRITE) { + struct dma_slave_config dma_tx_conf = { + .direction = DMA_MEM_TO_DEV, + .dst_addr = host->mem_res->start + DAVINCI_MMCDXR, + .dst_addr_width = DMA_SLAVE_BUSWIDTH_4_BYTES, + .dst_maxburst = + rw_threshold / DMA_SLAVE_BUSWIDTH_4_BYTES, + }; + chan = host->dma_tx; + dmaengine_slave_config(host->dma_tx, &dma_tx_conf); + + desc = dmaengine_prep_slave_sg(host->dma_tx, + data->sg, + host->sg_len, + DMA_MEM_TO_DEV, + DMA_PREP_INTERRUPT | DMA_CTRL_ACK); + if (!desc) { + dev_dbg(mmc_dev(host->mmc), + "failed to allocate DMA TX descriptor"); + ret = -1; + goto out; + } + } else { + struct dma_slave_config dma_rx_conf = { + .direction = DMA_DEV_TO_MEM, + .src_addr = host->mem_res->start + DAVINCI_MMCDRR, + .src_addr_width = DMA_SLAVE_BUSWIDTH_4_BYTES, + .src_maxburst = + rw_threshold / DMA_SLAVE_BUSWIDTH_4_BYTES, + }; + chan = host->dma_rx; + dmaengine_slave_config(host->dma_rx, &dma_rx_conf); + + desc = dmaengine_prep_slave_sg(host->dma_rx, + data->sg, + host->sg_len, + DMA_DEV_TO_MEM, + DMA_PREP_INTERRUPT | DMA_CTRL_ACK); + if (!desc) { + dev_dbg(mmc_dev(host->mmc), + "failed to allocate DMA RX descriptor"); + ret = -1; + goto out; + } + } + + dmaengine_submit(desc); + dma_async_issue_pending(chan); + +out: + return ret; +} + +static int mmc_davinci_start_dma_transfer(struct mmc_davinci_host *host, + struct mmc_data *data) +{ + int i; + int mask = rw_threshold - 1; + int ret = 0; + + host->sg_len = dma_map_sg(mmc_dev(host->mmc), data->sg, data->sg_len, + mmc_get_dma_dir(data)); + + /* no individual DMA segment should need a partial FIFO */ + for (i = 0; i < host->sg_len; i++) { + if (sg_dma_len(data->sg + i) & mask) { + dma_unmap_sg(mmc_dev(host->mmc), + data->sg, data->sg_len, + mmc_get_dma_dir(data)); + return -1; + } + } + + host->do_dma = 1; + ret = mmc_davinci_send_dma_request(host, data); + + return ret; +} + +static void davinci_release_dma_channels(struct mmc_davinci_host *host) +{ + if (!host->use_dma) + return; + + dma_release_channel(host->dma_tx); + dma_release_channel(host->dma_rx); +} + +static int davinci_acquire_dma_channels(struct mmc_davinci_host *host) +{ + host->dma_tx = dma_request_chan(mmc_dev(host->mmc), "tx"); + if (IS_ERR(host->dma_tx)) { + dev_err(mmc_dev(host->mmc), "Can't get dma_tx channel\n"); + return PTR_ERR(host->dma_tx); + } + + host->dma_rx = dma_request_chan(mmc_dev(host->mmc), "rx"); + if (IS_ERR(host->dma_rx)) { + dev_err(mmc_dev(host->mmc), "Can't get dma_rx channel\n"); + dma_release_channel(host->dma_tx); + return PTR_ERR(host->dma_rx); + } + + return 0; +} + +/*----------------------------------------------------------------------*/ + +static void +mmc_davinci_prepare_data(struct mmc_davinci_host *host, struct mmc_request *req) +{ + int fifo_lev = (rw_threshold == 32) ? MMCFIFOCTL_FIFOLEV : 0; + int timeout; + struct mmc_data *data = req->data; + + if (host->version == MMC_CTLR_VERSION_2) + fifo_lev = (rw_threshold == 64) ? MMCFIFOCTL_FIFOLEV : 0; + + host->data = data; + if (data == NULL) { + host->data_dir = DAVINCI_MMC_DATADIR_NONE; + writel(0, host->base + DAVINCI_MMCBLEN); + writel(0, host->base + DAVINCI_MMCNBLK); + return; + } + + dev_dbg(mmc_dev(host->mmc), "%s, %d blocks of %d bytes\n", + (data->flags & MMC_DATA_WRITE) ? "write" : "read", + data->blocks, data->blksz); + dev_dbg(mmc_dev(host->mmc), " DTO %d cycles + %d ns\n", + data->timeout_clks, data->timeout_ns); + timeout = data->timeout_clks + + (data->timeout_ns / host->ns_in_one_cycle); + if (timeout > 0xffff) + timeout = 0xffff; + + writel(timeout, host->base + DAVINCI_MMCTOD); + writel(data->blocks, host->base + DAVINCI_MMCNBLK); + writel(data->blksz, host->base + DAVINCI_MMCBLEN); + + /* Configure the FIFO */ + if (data->flags & MMC_DATA_WRITE) { + host->data_dir = DAVINCI_MMC_DATADIR_WRITE; + writel(fifo_lev | MMCFIFOCTL_FIFODIR_WR | MMCFIFOCTL_FIFORST, + host->base + DAVINCI_MMCFIFOCTL); + writel(fifo_lev | MMCFIFOCTL_FIFODIR_WR, + host->base + DAVINCI_MMCFIFOCTL); + } else { + host->data_dir = DAVINCI_MMC_DATADIR_READ; + writel(fifo_lev | MMCFIFOCTL_FIFODIR_RD | MMCFIFOCTL_FIFORST, + host->base + DAVINCI_MMCFIFOCTL); + writel(fifo_lev | MMCFIFOCTL_FIFODIR_RD, + host->base + DAVINCI_MMCFIFOCTL); + } + + host->buffer = NULL; + host->bytes_left = data->blocks * data->blksz; + + /* For now we try to use DMA whenever we won't need partial FIFO + * reads or writes, either for the whole transfer (as tested here) + * or for any individual scatterlist segment (tested when we call + * start_dma_transfer). + * + * While we *could* change that, unusual block sizes are rarely + * used. The occasional fallback to PIO should't hurt. + */ + if (host->use_dma && (host->bytes_left & (rw_threshold - 1)) == 0 + && mmc_davinci_start_dma_transfer(host, data) == 0) { + /* zero this to ensure we take no PIO paths */ + host->bytes_left = 0; + } else { + /* Revert to CPU Copy */ + host->sg_len = data->sg_len; + host->sg = host->data->sg; + mmc_davinci_sg_to_buf(host); + } +} + +static void mmc_davinci_request(struct mmc_host *mmc, struct mmc_request *req) +{ + struct mmc_davinci_host *host = mmc_priv(mmc); + unsigned long timeout = jiffies + msecs_to_jiffies(900); + u32 mmcst1 = 0; + + /* Card may still be sending BUSY after a previous operation, + * typically some kind of write. If so, we can't proceed yet. + */ + while (time_before(jiffies, timeout)) { + mmcst1 = readl(host->base + DAVINCI_MMCST1); + if (!(mmcst1 & MMCST1_BUSY)) + break; + cpu_relax(); + } + if (mmcst1 & MMCST1_BUSY) { + dev_err(mmc_dev(host->mmc), "still BUSY? bad ... \n"); + req->cmd->error = -ETIMEDOUT; + mmc_request_done(mmc, req); + return; + } + + host->do_dma = 0; + mmc_davinci_prepare_data(host, req); + mmc_davinci_start_command(host, req->cmd); +} + +static unsigned int calculate_freq_for_card(struct mmc_davinci_host *host, + unsigned int mmc_req_freq) +{ + unsigned int mmc_freq = 0, mmc_pclk = 0, mmc_push_pull_divisor = 0; + + mmc_pclk = host->mmc_input_clk; + if (mmc_req_freq && mmc_pclk > (2 * mmc_req_freq)) + mmc_push_pull_divisor = ((unsigned int)mmc_pclk + / (2 * mmc_req_freq)) - 1; + else + mmc_push_pull_divisor = 0; + + mmc_freq = (unsigned int)mmc_pclk + / (2 * (mmc_push_pull_divisor + 1)); + + if (mmc_freq > mmc_req_freq) + mmc_push_pull_divisor = mmc_push_pull_divisor + 1; + /* Convert ns to clock cycles */ + if (mmc_req_freq <= 400000) + host->ns_in_one_cycle = (1000000) / (((mmc_pclk + / (2 * (mmc_push_pull_divisor + 1)))/1000)); + else + host->ns_in_one_cycle = (1000000) / (((mmc_pclk + / (2 * (mmc_push_pull_divisor + 1)))/1000000)); + + return mmc_push_pull_divisor; +} + +static void calculate_clk_divider(struct mmc_host *mmc, struct mmc_ios *ios) +{ + unsigned int open_drain_freq = 0, mmc_pclk = 0; + unsigned int mmc_push_pull_freq = 0; + struct mmc_davinci_host *host = mmc_priv(mmc); + + if (ios->bus_mode == MMC_BUSMODE_OPENDRAIN) { + u32 temp; + + /* Ignoring the init clock value passed for fixing the inter + * operability with different cards. + */ + open_drain_freq = ((unsigned int)mmc_pclk + / (2 * MMCSD_INIT_CLOCK)) - 1; + + if (open_drain_freq > 0xFF) + open_drain_freq = 0xFF; + + temp = readl(host->base + DAVINCI_MMCCLK) & ~MMCCLK_CLKRT_MASK; + temp |= open_drain_freq; + writel(temp, host->base + DAVINCI_MMCCLK); + + /* Convert ns to clock cycles */ + host->ns_in_one_cycle = (1000000) / (MMCSD_INIT_CLOCK/1000); + } else { + u32 temp; + mmc_push_pull_freq = calculate_freq_for_card(host, ios->clock); + + if (mmc_push_pull_freq > 0xFF) + mmc_push_pull_freq = 0xFF; + + temp = readl(host->base + DAVINCI_MMCCLK) & ~MMCCLK_CLKEN; + writel(temp, host->base + DAVINCI_MMCCLK); + + udelay(10); + + temp = readl(host->base + DAVINCI_MMCCLK) & ~MMCCLK_CLKRT_MASK; + temp |= mmc_push_pull_freq; + writel(temp, host->base + DAVINCI_MMCCLK); + + writel(temp | MMCCLK_CLKEN, host->base + DAVINCI_MMCCLK); + + udelay(10); + } +} + +static void mmc_davinci_set_ios(struct mmc_host *mmc, struct mmc_ios *ios) +{ + struct mmc_davinci_host *host = mmc_priv(mmc); + struct platform_device *pdev = to_platform_device(mmc->parent); + struct davinci_mmc_config *config = pdev->dev.platform_data; + + dev_dbg(mmc_dev(host->mmc), + "clock %dHz busmode %d powermode %d Vdd %04x\n", + ios->clock, ios->bus_mode, ios->power_mode, + ios->vdd); + + switch (ios->power_mode) { + case MMC_POWER_OFF: + if (config && config->set_power) + config->set_power(pdev->id, false); + break; + case MMC_POWER_UP: + if (config && config->set_power) + config->set_power(pdev->id, true); + break; + } + + switch (ios->bus_width) { + case MMC_BUS_WIDTH_8: + dev_dbg(mmc_dev(host->mmc), "Enabling 8 bit mode\n"); + writel((readl(host->base + DAVINCI_MMCCTL) & + ~MMCCTL_WIDTH_4_BIT) | MMCCTL_WIDTH_8_BIT, + host->base + DAVINCI_MMCCTL); + break; + case MMC_BUS_WIDTH_4: + dev_dbg(mmc_dev(host->mmc), "Enabling 4 bit mode\n"); + if (host->version == MMC_CTLR_VERSION_2) + writel((readl(host->base + DAVINCI_MMCCTL) & + ~MMCCTL_WIDTH_8_BIT) | MMCCTL_WIDTH_4_BIT, + host->base + DAVINCI_MMCCTL); + else + writel(readl(host->base + DAVINCI_MMCCTL) | + MMCCTL_WIDTH_4_BIT, + host->base + DAVINCI_MMCCTL); + break; + case MMC_BUS_WIDTH_1: + dev_dbg(mmc_dev(host->mmc), "Enabling 1 bit mode\n"); + if (host->version == MMC_CTLR_VERSION_2) + writel(readl(host->base + DAVINCI_MMCCTL) & + ~(MMCCTL_WIDTH_8_BIT | MMCCTL_WIDTH_4_BIT), + host->base + DAVINCI_MMCCTL); + else + writel(readl(host->base + DAVINCI_MMCCTL) & + ~MMCCTL_WIDTH_4_BIT, + host->base + DAVINCI_MMCCTL); + break; + } + + calculate_clk_divider(mmc, ios); + + host->bus_mode = ios->bus_mode; + if (ios->power_mode == MMC_POWER_UP) { + unsigned long timeout = jiffies + msecs_to_jiffies(50); + bool lose = true; + + /* Send clock cycles, poll completion */ + writel(0, host->base + DAVINCI_MMCARGHL); + writel(MMCCMD_INITCK, host->base + DAVINCI_MMCCMD); + while (time_before(jiffies, timeout)) { + u32 tmp = readl(host->base + DAVINCI_MMCST0); + + if (tmp & MMCST0_RSPDNE) { + lose = false; + break; + } + cpu_relax(); + } + if (lose) + dev_warn(mmc_dev(host->mmc), "powerup timeout\n"); + } + + /* FIXME on power OFF, reset things ... */ +} + +static void +mmc_davinci_xfer_done(struct mmc_davinci_host *host, struct mmc_data *data) +{ + host->data = NULL; + + if (host->mmc->caps & MMC_CAP_SDIO_IRQ) { + /* + * SDIO Interrupt Detection work-around as suggested by + * Davinci Errata (TMS320DM355 Silicon Revision 1.1 Errata + * 2.1.6): Signal SDIO interrupt only if it is enabled by core + */ + if (host->sdio_int && !(readl(host->base + DAVINCI_SDIOST0) & + SDIOST0_DAT1_HI)) { + writel(SDIOIST_IOINT, host->base + DAVINCI_SDIOIST); + mmc_signal_sdio_irq(host->mmc); + } + } + + if (host->do_dma) { + davinci_abort_dma(host); + + dma_unmap_sg(mmc_dev(host->mmc), data->sg, data->sg_len, + mmc_get_dma_dir(data)); + host->do_dma = false; + } + host->data_dir = DAVINCI_MMC_DATADIR_NONE; + + if (!data->stop || (host->cmd && host->cmd->error)) { + mmc_request_done(host->mmc, data->mrq); + writel(0, host->base + DAVINCI_MMCIM); + host->active_request = false; + } else + mmc_davinci_start_command(host, data->stop); +} + +static void mmc_davinci_cmd_done(struct mmc_davinci_host *host, + struct mmc_command *cmd) +{ + host->cmd = NULL; + + if (cmd->flags & MMC_RSP_PRESENT) { + if (cmd->flags & MMC_RSP_136) { + /* response type 2 */ + cmd->resp[3] = readl(host->base + DAVINCI_MMCRSP01); + cmd->resp[2] = readl(host->base + DAVINCI_MMCRSP23); + cmd->resp[1] = readl(host->base + DAVINCI_MMCRSP45); + cmd->resp[0] = readl(host->base + DAVINCI_MMCRSP67); + } else { + /* response types 1, 1b, 3, 4, 5, 6 */ + cmd->resp[0] = readl(host->base + DAVINCI_MMCRSP67); + } + } + + if (host->data == NULL || cmd->error) { + if (cmd->error == -ETIMEDOUT) + cmd->mrq->cmd->retries = 0; + mmc_request_done(host->mmc, cmd->mrq); + writel(0, host->base + DAVINCI_MMCIM); + host->active_request = false; + } +} + +static inline void mmc_davinci_reset_ctrl(struct mmc_davinci_host *host, + int val) +{ + u32 temp; + + temp = readl(host->base + DAVINCI_MMCCTL); + if (val) /* reset */ + temp |= MMCCTL_CMDRST | MMCCTL_DATRST; + else /* enable */ + temp &= ~(MMCCTL_CMDRST | MMCCTL_DATRST); + + writel(temp, host->base + DAVINCI_MMCCTL); + udelay(10); +} + +static void +davinci_abort_data(struct mmc_davinci_host *host, struct mmc_data *data) +{ + mmc_davinci_reset_ctrl(host, 1); + mmc_davinci_reset_ctrl(host, 0); +} + +static irqreturn_t mmc_davinci_sdio_irq(int irq, void *dev_id) +{ + struct mmc_davinci_host *host = dev_id; + unsigned int status; + + status = readl(host->base + DAVINCI_SDIOIST); + if (status & SDIOIST_IOINT) { + dev_dbg(mmc_dev(host->mmc), + "SDIO interrupt status %x\n", status); + writel(status | SDIOIST_IOINT, host->base + DAVINCI_SDIOIST); + mmc_signal_sdio_irq(host->mmc); + } + return IRQ_HANDLED; +} + +static irqreturn_t mmc_davinci_irq(int irq, void *dev_id) +{ + struct mmc_davinci_host *host = (struct mmc_davinci_host *)dev_id; + unsigned int status, qstatus; + int end_command = 0; + int end_transfer = 0; + struct mmc_data *data = host->data; + + if (host->cmd == NULL && host->data == NULL) { + status = readl(host->base + DAVINCI_MMCST0); + dev_dbg(mmc_dev(host->mmc), + "Spurious interrupt 0x%04x\n", status); + /* Disable the interrupt from mmcsd */ + writel(0, host->base + DAVINCI_MMCIM); + return IRQ_NONE; + } + + status = readl(host->base + DAVINCI_MMCST0); + qstatus = status; + + /* handle FIFO first when using PIO for data. + * bytes_left will decrease to zero as I/O progress and status will + * read zero over iteration because this controller status + * register(MMCST0) reports any status only once and it is cleared + * by read. So, it is not unbouned loop even in the case of + * non-dma. + */ + if (host->bytes_left && (status & (MMCST0_DXRDY | MMCST0_DRRDY))) { + unsigned long im_val; + + /* + * If interrupts fire during the following loop, they will be + * handled by the handler, but the PIC will still buffer these. + * As a result, the handler will be called again to serve these + * needlessly. In order to avoid these spurious interrupts, + * keep interrupts masked during the loop. + */ + im_val = readl(host->base + DAVINCI_MMCIM); + writel(0, host->base + DAVINCI_MMCIM); + + do { + davinci_fifo_data_trans(host, rw_threshold); + status = readl(host->base + DAVINCI_MMCST0); + qstatus |= status; + } while (host->bytes_left && + (status & (MMCST0_DXRDY | MMCST0_DRRDY))); + + /* + * If an interrupt is pending, it is assumed it will fire when + * it is unmasked. This assumption is also taken when the MMCIM + * is first set. Otherwise, writing to MMCIM after reading the + * status is race-prone. + */ + writel(im_val, host->base + DAVINCI_MMCIM); + } + + if (qstatus & MMCST0_DATDNE) { + /* All blocks sent/received, and CRC checks passed */ + if (data != NULL) { + if ((host->do_dma == 0) && (host->bytes_left > 0)) { + /* if datasize < rw_threshold + * no RX ints are generated + */ + davinci_fifo_data_trans(host, host->bytes_left); + } + end_transfer = 1; + data->bytes_xfered = data->blocks * data->blksz; + } else { + dev_err(mmc_dev(host->mmc), + "DATDNE with no host->data\n"); + } + } + + if (qstatus & MMCST0_TOUTRD) { + /* Read data timeout */ + data->error = -ETIMEDOUT; + end_transfer = 1; + + dev_dbg(mmc_dev(host->mmc), + "read data timeout, status %x\n", + qstatus); + + davinci_abort_data(host, data); + } + + if (qstatus & (MMCST0_CRCWR | MMCST0_CRCRD)) { + /* Data CRC error */ + data->error = -EILSEQ; + end_transfer = 1; + + /* NOTE: this controller uses CRCWR to report both CRC + * errors and timeouts (on writes). MMCDRSP values are + * only weakly documented, but 0x9f was clearly a timeout + * case and the two three-bit patterns in various SD specs + * (101, 010) aren't part of it ... + */ + if (qstatus & MMCST0_CRCWR) { + u32 temp = readb(host->base + DAVINCI_MMCDRSP); + + if (temp == 0x9f) + data->error = -ETIMEDOUT; + } + dev_dbg(mmc_dev(host->mmc), "data %s %s error\n", + (qstatus & MMCST0_CRCWR) ? "write" : "read", + (data->error == -ETIMEDOUT) ? "timeout" : "CRC"); + + davinci_abort_data(host, data); + } + + if (qstatus & MMCST0_TOUTRS) { + /* Command timeout */ + if (host->cmd) { + dev_dbg(mmc_dev(host->mmc), + "CMD%d timeout, status %x\n", + host->cmd->opcode, qstatus); + host->cmd->error = -ETIMEDOUT; + if (data) { + end_transfer = 1; + davinci_abort_data(host, data); + } else + end_command = 1; + } + } + + if (qstatus & MMCST0_CRCRS) { + /* Command CRC error */ + dev_dbg(mmc_dev(host->mmc), "Command CRC error\n"); + if (host->cmd) { + host->cmd->error = -EILSEQ; + end_command = 1; + } + } + + if (qstatus & MMCST0_RSPDNE) { + /* End of command phase */ + end_command = (int) host->cmd; + } + + if (end_command) + mmc_davinci_cmd_done(host, host->cmd); + if (end_transfer) + mmc_davinci_xfer_done(host, data); + return IRQ_HANDLED; +} + +static int mmc_davinci_get_cd(struct mmc_host *mmc) +{ + struct platform_device *pdev = to_platform_device(mmc->parent); + struct davinci_mmc_config *config = pdev->dev.platform_data; + + if (config && config->get_cd) + return config->get_cd(pdev->id); + + return mmc_gpio_get_cd(mmc); +} + +static int mmc_davinci_get_ro(struct mmc_host *mmc) +{ + struct platform_device *pdev = to_platform_device(mmc->parent); + struct davinci_mmc_config *config = pdev->dev.platform_data; + + if (config && config->get_ro) + return config->get_ro(pdev->id); + + return mmc_gpio_get_ro(mmc); +} + +static void mmc_davinci_enable_sdio_irq(struct mmc_host *mmc, int enable) +{ + struct mmc_davinci_host *host = mmc_priv(mmc); + + if (enable) { + if (!(readl(host->base + DAVINCI_SDIOST0) & SDIOST0_DAT1_HI)) { + writel(SDIOIST_IOINT, host->base + DAVINCI_SDIOIST); + mmc_signal_sdio_irq(host->mmc); + } else { + host->sdio_int = true; + writel(readl(host->base + DAVINCI_SDIOIEN) | + SDIOIEN_IOINTEN, host->base + DAVINCI_SDIOIEN); + } + } else { + host->sdio_int = false; + writel(readl(host->base + DAVINCI_SDIOIEN) & ~SDIOIEN_IOINTEN, + host->base + DAVINCI_SDIOIEN); + } +} + +static const struct mmc_host_ops mmc_davinci_ops = { + .request = mmc_davinci_request, + .set_ios = mmc_davinci_set_ios, + .get_cd = mmc_davinci_get_cd, + .get_ro = mmc_davinci_get_ro, + .enable_sdio_irq = mmc_davinci_enable_sdio_irq, +}; + +/*----------------------------------------------------------------------*/ + +#ifdef CONFIG_CPU_FREQ +static int mmc_davinci_cpufreq_transition(struct notifier_block *nb, + unsigned long val, void *data) +{ + struct mmc_davinci_host *host; + unsigned int mmc_pclk; + struct mmc_host *mmc; + unsigned long flags; + + host = container_of(nb, struct mmc_davinci_host, freq_transition); + mmc = host->mmc; + mmc_pclk = clk_get_rate(host->clk); + + if (val == CPUFREQ_POSTCHANGE) { + spin_lock_irqsave(&mmc->lock, flags); + host->mmc_input_clk = mmc_pclk; + calculate_clk_divider(mmc, &mmc->ios); + spin_unlock_irqrestore(&mmc->lock, flags); + } + + return 0; +} + +static inline int mmc_davinci_cpufreq_register(struct mmc_davinci_host *host) +{ + host->freq_transition.notifier_call = mmc_davinci_cpufreq_transition; + + return cpufreq_register_notifier(&host->freq_transition, + CPUFREQ_TRANSITION_NOTIFIER); +} + +static inline void mmc_davinci_cpufreq_deregister(struct mmc_davinci_host *host) +{ + cpufreq_unregister_notifier(&host->freq_transition, + CPUFREQ_TRANSITION_NOTIFIER); +} +#else +static inline int mmc_davinci_cpufreq_register(struct mmc_davinci_host *host) +{ + return 0; +} + +static inline void mmc_davinci_cpufreq_deregister(struct mmc_davinci_host *host) +{ +} +#endif +static void init_mmcsd_host(struct mmc_davinci_host *host) +{ + + mmc_davinci_reset_ctrl(host, 1); + + writel(0, host->base + DAVINCI_MMCCLK); + writel(MMCCLK_CLKEN, host->base + DAVINCI_MMCCLK); + + writel(0x1FFF, host->base + DAVINCI_MMCTOR); + writel(0xFFFF, host->base + DAVINCI_MMCTOD); + + mmc_davinci_reset_ctrl(host, 0); +} + +static const struct platform_device_id davinci_mmc_devtype[] = { + { + .name = "dm6441-mmc", + .driver_data = MMC_CTLR_VERSION_1, + }, { + .name = "da830-mmc", + .driver_data = MMC_CTLR_VERSION_2, + }, + {}, +}; +MODULE_DEVICE_TABLE(platform, davinci_mmc_devtype); + +static const struct of_device_id davinci_mmc_dt_ids[] = { + { + .compatible = "ti,dm6441-mmc", + .data = &davinci_mmc_devtype[MMC_CTLR_VERSION_1], + }, + { + .compatible = "ti,da830-mmc", + .data = &davinci_mmc_devtype[MMC_CTLR_VERSION_2], + }, + {}, +}; +MODULE_DEVICE_TABLE(of, davinci_mmc_dt_ids); + +static int mmc_davinci_parse_pdata(struct mmc_host *mmc) +{ + struct platform_device *pdev = to_platform_device(mmc->parent); + struct davinci_mmc_config *pdata = pdev->dev.platform_data; + struct mmc_davinci_host *host; + int ret; + + if (!pdata) + return -EINVAL; + + host = mmc_priv(mmc); + if (!host) + return -EINVAL; + + if (pdata && pdata->nr_sg) + host->nr_sg = pdata->nr_sg - 1; + + if (pdata && (pdata->wires == 4 || pdata->wires == 0)) + mmc->caps |= MMC_CAP_4_BIT_DATA; + + if (pdata && (pdata->wires == 8)) + mmc->caps |= (MMC_CAP_4_BIT_DATA | MMC_CAP_8_BIT_DATA); + + mmc->f_min = 312500; + mmc->f_max = 25000000; + if (pdata && pdata->max_freq) + mmc->f_max = pdata->max_freq; + if (pdata && pdata->caps) + mmc->caps |= pdata->caps; + + /* Register a cd gpio, if there is not one, enable polling */ + ret = mmc_gpiod_request_cd(mmc, "cd", 0, false, 0, NULL); + if (ret == -EPROBE_DEFER) + return ret; + else if (ret) + mmc->caps |= MMC_CAP_NEEDS_POLL; + + ret = mmc_gpiod_request_ro(mmc, "wp", 0, false, 0, NULL); + if (ret == -EPROBE_DEFER) + return ret; + + return 0; +} + +static int davinci_mmcsd_probe(struct platform_device *pdev) +{ + const struct of_device_id *match; + struct mmc_davinci_host *host = NULL; + struct mmc_host *mmc = NULL; + struct resource *r, *mem = NULL; + int ret, irq; + size_t mem_size; + const struct platform_device_id *id_entry; + + r = platform_get_resource(pdev, IORESOURCE_MEM, 0); + if (!r) + return -ENODEV; + irq = platform_get_irq(pdev, 0); + if (irq < 0) + return irq; + + mem_size = resource_size(r); + mem = devm_request_mem_region(&pdev->dev, r->start, mem_size, + pdev->name); + if (!mem) + return -EBUSY; + + mmc = mmc_alloc_host(sizeof(struct mmc_davinci_host), &pdev->dev); + if (!mmc) + return -ENOMEM; + + host = mmc_priv(mmc); + host->mmc = mmc; /* Important */ + + host->mem_res = mem; + host->base = devm_ioremap(&pdev->dev, mem->start, mem_size); + if (!host->base) { + ret = -ENOMEM; + goto ioremap_fail; + } + + host->clk = devm_clk_get(&pdev->dev, NULL); + if (IS_ERR(host->clk)) { + ret = PTR_ERR(host->clk); + goto clk_get_fail; + } + ret = clk_prepare_enable(host->clk); + if (ret) + goto clk_prepare_enable_fail; + + host->mmc_input_clk = clk_get_rate(host->clk); + + match = of_match_device(davinci_mmc_dt_ids, &pdev->dev); + if (match) { + pdev->id_entry = match->data; + ret = mmc_of_parse(mmc); + if (ret) { + if (ret != -EPROBE_DEFER) + dev_err(&pdev->dev, + "could not parse of data: %d\n", ret); + goto parse_fail; + } + } else { + ret = mmc_davinci_parse_pdata(mmc); + if (ret) { + dev_err(&pdev->dev, + "could not parse platform data: %d\n", ret); + goto parse_fail; + } } + + if (host->nr_sg > MAX_NR_SG || !host->nr_sg) + host->nr_sg = MAX_NR_SG; + + init_mmcsd_host(host); + + host->use_dma = use_dma; + host->mmc_irq = irq; + host->sdio_irq = platform_get_irq(pdev, 1); + + if (host->use_dma) { + ret = davinci_acquire_dma_channels(host); + if (ret == -EPROBE_DEFER) + goto dma_probe_defer; + else if (ret) + host->use_dma = 0; + } + + mmc->caps |= MMC_CAP_WAIT_WHILE_BUSY; + + id_entry = platform_get_device_id(pdev); + if (id_entry) + host->version = id_entry->driver_data; + + mmc->ops = &mmc_davinci_ops; + mmc->ocr_avail = MMC_VDD_32_33 | MMC_VDD_33_34; + + /* With no iommu coalescing pages, each phys_seg is a hw_seg. + * Each hw_seg uses one EDMA parameter RAM slot, always one + * channel and then usually some linked slots. + */ + mmc->max_segs = MAX_NR_SG; + + /* EDMA limit per hw segment (one or two MBytes) */ + mmc->max_seg_size = MAX_CCNT * rw_threshold; + + /* MMC/SD controller limits for multiblock requests */ + mmc->max_blk_size = 4095; /* BLEN is 12 bits */ + mmc->max_blk_count = 65535; /* NBLK is 16 bits */ + mmc->max_req_size = mmc->max_blk_size * mmc->max_blk_count; + + dev_dbg(mmc_dev(host->mmc), "max_segs=%d\n", mmc->max_segs); + dev_dbg(mmc_dev(host->mmc), "max_blk_size=%d\n", mmc->max_blk_size); + dev_dbg(mmc_dev(host->mmc), "max_req_size=%d\n", mmc->max_req_size); + dev_dbg(mmc_dev(host->mmc), "max_seg_size=%d\n", mmc->max_seg_size); + + platform_set_drvdata(pdev, host); + + ret = mmc_davinci_cpufreq_register(host); + if (ret) { + dev_err(&pdev->dev, "failed to register cpufreq\n"); + goto cpu_freq_fail; + } + + ret = mmc_add_host(mmc); + if (ret < 0) + goto mmc_add_host_fail; + + ret = devm_request_irq(&pdev->dev, irq, mmc_davinci_irq, 0, + mmc_hostname(mmc), host); + if (ret) + goto request_irq_fail; + + if (host->sdio_irq >= 0) { + ret = devm_request_irq(&pdev->dev, host->sdio_irq, + mmc_davinci_sdio_irq, 0, + mmc_hostname(mmc), host); + if (!ret) + mmc->caps |= MMC_CAP_SDIO_IRQ; + } + + rename_region(mem, mmc_hostname(mmc)); + + dev_info(mmc_dev(host->mmc), "Using %s, %d-bit mode\n", + host->use_dma ? "DMA" : "PIO", + (mmc->caps & MMC_CAP_4_BIT_DATA) ? 4 : 1); + + return 0; + +request_irq_fail: + mmc_remove_host(mmc); +mmc_add_host_fail: + mmc_davinci_cpufreq_deregister(host); +cpu_freq_fail: + davinci_release_dma_channels(host); +parse_fail: +dma_probe_defer: + clk_disable_unprepare(host->clk); +clk_prepare_enable_fail: +clk_get_fail: +ioremap_fail: + mmc_free_host(mmc); + + return ret; +} + +static int __exit davinci_mmcsd_remove(struct platform_device *pdev) +{ + struct mmc_davinci_host *host = platform_get_drvdata(pdev); + + mmc_remove_host(host->mmc); + mmc_davinci_cpufreq_deregister(host); + davinci_release_dma_channels(host); + clk_disable_unprepare(host->clk); + mmc_free_host(host->mmc); + + return 0; +} + +#ifdef CONFIG_PM +static int davinci_mmcsd_suspend(struct device *dev) +{ + struct mmc_davinci_host *host = dev_get_drvdata(dev); + + writel(0, host->base + DAVINCI_MMCIM); + mmc_davinci_reset_ctrl(host, 1); + clk_disable(host->clk); + + return 0; +} + +static int davinci_mmcsd_resume(struct device *dev) +{ + struct mmc_davinci_host *host = dev_get_drvdata(dev); + int ret; + + ret = clk_enable(host->clk); + if (ret) + return ret; + + mmc_davinci_reset_ctrl(host, 0); + + return 0; +} + +static const struct dev_pm_ops davinci_mmcsd_pm = { + .suspend = davinci_mmcsd_suspend, + .resume = davinci_mmcsd_resume, +}; + +#define davinci_mmcsd_pm_ops (&davinci_mmcsd_pm) +#else +#define davinci_mmcsd_pm_ops NULL +#endif + +static struct platform_driver davinci_mmcsd_driver = { + .driver = { + .name = "davinci_mmc", + .pm = davinci_mmcsd_pm_ops, + .of_match_table = davinci_mmc_dt_ids, + }, + .probe = davinci_mmcsd_probe, + .remove = __exit_p(davinci_mmcsd_remove), + .id_table = davinci_mmc_devtype, +}; + +module_platform_driver(davinci_mmcsd_driver); + +MODULE_AUTHOR("Texas Instruments India"); +MODULE_LICENSE("GPL"); +MODULE_DESCRIPTION("MMC/SD driver for Davinci MMC controller"); +MODULE_ALIAS("platform:davinci_mmc"); + |