diff options
Diffstat (limited to 'drivers/mmc/host/dw_mmc.c')
| -rw-r--r-- | drivers/mmc/host/dw_mmc.c | 3616 |
1 files changed, 3616 insertions, 0 deletions
diff --git a/drivers/mmc/host/dw_mmc.c b/drivers/mmc/host/dw_mmc.c new file mode 100644 index 0000000000..829af2c98a --- /dev/null +++ b/drivers/mmc/host/dw_mmc.c @@ -0,0 +1,3616 @@ +// SPDX-License-Identifier: GPL-2.0-or-later +/* + * Synopsys DesignWare Multimedia Card Interface driver + * (Based on NXP driver for lpc 31xx) + * + * Copyright (C) 2009 NXP Semiconductors + * Copyright (C) 2009, 2010 Imagination Technologies Ltd. + */ + +#include <linux/blkdev.h> +#include <linux/clk.h> +#include <linux/debugfs.h> +#include <linux/device.h> +#include <linux/dma-mapping.h> +#include <linux/err.h> +#include <linux/init.h> +#include <linux/interrupt.h> +#include <linux/iopoll.h> +#include <linux/ioport.h> +#include <linux/ktime.h> +#include <linux/module.h> +#include <linux/platform_device.h> +#include <linux/pm_runtime.h> +#include <linux/prandom.h> +#include <linux/seq_file.h> +#include <linux/slab.h> +#include <linux/stat.h> +#include <linux/delay.h> +#include <linux/irq.h> +#include <linux/mmc/card.h> +#include <linux/mmc/host.h> +#include <linux/mmc/mmc.h> +#include <linux/mmc/sd.h> +#include <linux/mmc/sdio.h> +#include <linux/bitops.h> +#include <linux/regulator/consumer.h> +#include <linux/of.h> +#include <linux/of_gpio.h> +#include <linux/mmc/slot-gpio.h> + +#include "dw_mmc.h" + +/* Common flag combinations */ +#define DW_MCI_DATA_ERROR_FLAGS (SDMMC_INT_DRTO | SDMMC_INT_DCRC | \ + SDMMC_INT_HTO | SDMMC_INT_SBE | \ + SDMMC_INT_EBE | SDMMC_INT_HLE) +#define DW_MCI_CMD_ERROR_FLAGS (SDMMC_INT_RTO | SDMMC_INT_RCRC | \ + SDMMC_INT_RESP_ERR | SDMMC_INT_HLE) +#define DW_MCI_ERROR_FLAGS (DW_MCI_DATA_ERROR_FLAGS | \ + DW_MCI_CMD_ERROR_FLAGS) +#define DW_MCI_SEND_STATUS 1 +#define DW_MCI_RECV_STATUS 2 +#define DW_MCI_DMA_THRESHOLD 16 + +#define DW_MCI_FREQ_MAX 200000000 /* unit: HZ */ +#define DW_MCI_FREQ_MIN 100000 /* unit: HZ */ + +#define IDMAC_INT_CLR (SDMMC_IDMAC_INT_AI | SDMMC_IDMAC_INT_NI | \ + SDMMC_IDMAC_INT_CES | SDMMC_IDMAC_INT_DU | \ + SDMMC_IDMAC_INT_FBE | SDMMC_IDMAC_INT_RI | \ + SDMMC_IDMAC_INT_TI) + +#define DESC_RING_BUF_SZ PAGE_SIZE + +struct idmac_desc_64addr { + u32 des0; /* Control Descriptor */ +#define IDMAC_OWN_CLR64(x) \ + !((x) & cpu_to_le32(IDMAC_DES0_OWN)) + + u32 des1; /* Reserved */ + + u32 des2; /*Buffer sizes */ +#define IDMAC_64ADDR_SET_BUFFER1_SIZE(d, s) \ + ((d)->des2 = ((d)->des2 & cpu_to_le32(0x03ffe000)) | \ + ((cpu_to_le32(s)) & cpu_to_le32(0x1fff))) + + u32 des3; /* Reserved */ + + u32 des4; /* Lower 32-bits of Buffer Address Pointer 1*/ + u32 des5; /* Upper 32-bits of Buffer Address Pointer 1*/ + + u32 des6; /* Lower 32-bits of Next Descriptor Address */ + u32 des7; /* Upper 32-bits of Next Descriptor Address */ +}; + +struct idmac_desc { + __le32 des0; /* Control Descriptor */ +#define IDMAC_DES0_DIC BIT(1) +#define IDMAC_DES0_LD BIT(2) +#define IDMAC_DES0_FD BIT(3) +#define IDMAC_DES0_CH BIT(4) +#define IDMAC_DES0_ER BIT(5) +#define IDMAC_DES0_CES BIT(30) +#define IDMAC_DES0_OWN BIT(31) + + __le32 des1; /* Buffer sizes */ +#define IDMAC_SET_BUFFER1_SIZE(d, s) \ + ((d)->des1 = ((d)->des1 & cpu_to_le32(0x03ffe000)) | (cpu_to_le32((s) & 0x1fff))) + + __le32 des2; /* buffer 1 physical address */ + + __le32 des3; /* buffer 2 physical address */ +}; + +/* Each descriptor can transfer up to 4KB of data in chained mode */ +#define DW_MCI_DESC_DATA_LENGTH 0x1000 + +#if defined(CONFIG_DEBUG_FS) +static int dw_mci_req_show(struct seq_file *s, void *v) +{ + struct dw_mci_slot *slot = s->private; + struct mmc_request *mrq; + struct mmc_command *cmd; + struct mmc_command *stop; + struct mmc_data *data; + + /* Make sure we get a consistent snapshot */ + spin_lock_bh(&slot->host->lock); + mrq = slot->mrq; + + if (mrq) { + cmd = mrq->cmd; + data = mrq->data; + stop = mrq->stop; + + if (cmd) + seq_printf(s, + "CMD%u(0x%x) flg %x rsp %x %x %x %x err %d\n", + cmd->opcode, cmd->arg, cmd->flags, + cmd->resp[0], cmd->resp[1], cmd->resp[2], + cmd->resp[2], cmd->error); + if (data) + seq_printf(s, "DATA %u / %u * %u flg %x err %d\n", + data->bytes_xfered, data->blocks, + data->blksz, data->flags, data->error); + if (stop) + seq_printf(s, + "CMD%u(0x%x) flg %x rsp %x %x %x %x err %d\n", + stop->opcode, stop->arg, stop->flags, + stop->resp[0], stop->resp[1], stop->resp[2], + stop->resp[2], stop->error); + } + + spin_unlock_bh(&slot->host->lock); + + return 0; +} +DEFINE_SHOW_ATTRIBUTE(dw_mci_req); + +static int dw_mci_regs_show(struct seq_file *s, void *v) +{ + struct dw_mci *host = s->private; + + pm_runtime_get_sync(host->dev); + + seq_printf(s, "STATUS:\t0x%08x\n", mci_readl(host, STATUS)); + seq_printf(s, "RINTSTS:\t0x%08x\n", mci_readl(host, RINTSTS)); + seq_printf(s, "CMD:\t0x%08x\n", mci_readl(host, CMD)); + seq_printf(s, "CTRL:\t0x%08x\n", mci_readl(host, CTRL)); + seq_printf(s, "INTMASK:\t0x%08x\n", mci_readl(host, INTMASK)); + seq_printf(s, "CLKENA:\t0x%08x\n", mci_readl(host, CLKENA)); + + pm_runtime_put_autosuspend(host->dev); + + return 0; +} +DEFINE_SHOW_ATTRIBUTE(dw_mci_regs); + +static void dw_mci_init_debugfs(struct dw_mci_slot *slot) +{ + struct mmc_host *mmc = slot->mmc; + struct dw_mci *host = slot->host; + struct dentry *root; + + root = mmc->debugfs_root; + if (!root) + return; + + debugfs_create_file("regs", S_IRUSR, root, host, &dw_mci_regs_fops); + debugfs_create_file("req", S_IRUSR, root, slot, &dw_mci_req_fops); + debugfs_create_u32("state", S_IRUSR, root, &host->state); + debugfs_create_xul("pending_events", S_IRUSR, root, + &host->pending_events); + debugfs_create_xul("completed_events", S_IRUSR, root, + &host->completed_events); +#ifdef CONFIG_FAULT_INJECTION + fault_create_debugfs_attr("fail_data_crc", root, &host->fail_data_crc); +#endif +} +#endif /* defined(CONFIG_DEBUG_FS) */ + +static bool dw_mci_ctrl_reset(struct dw_mci *host, u32 reset) +{ + u32 ctrl; + + ctrl = mci_readl(host, CTRL); + ctrl |= reset; + mci_writel(host, CTRL, ctrl); + + /* wait till resets clear */ + if (readl_poll_timeout_atomic(host->regs + SDMMC_CTRL, ctrl, + !(ctrl & reset), + 1, 500 * USEC_PER_MSEC)) { + dev_err(host->dev, + "Timeout resetting block (ctrl reset %#x)\n", + ctrl & reset); + return false; + } + + return true; +} + +static void dw_mci_wait_while_busy(struct dw_mci *host, u32 cmd_flags) +{ + u32 status; + + /* + * Databook says that before issuing a new data transfer command + * we need to check to see if the card is busy. Data transfer commands + * all have SDMMC_CMD_PRV_DAT_WAIT set, so we'll key off that. + * + * ...also allow sending for SDMMC_CMD_VOLT_SWITCH where busy is + * expected. + */ + if ((cmd_flags & SDMMC_CMD_PRV_DAT_WAIT) && + !(cmd_flags & SDMMC_CMD_VOLT_SWITCH)) { + if (readl_poll_timeout_atomic(host->regs + SDMMC_STATUS, + status, + !(status & SDMMC_STATUS_BUSY), + 10, 500 * USEC_PER_MSEC)) + dev_err(host->dev, "Busy; trying anyway\n"); + } +} + +static void mci_send_cmd(struct dw_mci_slot *slot, u32 cmd, u32 arg) +{ + struct dw_mci *host = slot->host; + unsigned int cmd_status = 0; + + mci_writel(host, CMDARG, arg); + wmb(); /* drain writebuffer */ + dw_mci_wait_while_busy(host, cmd); + mci_writel(host, CMD, SDMMC_CMD_START | cmd); + + if (readl_poll_timeout_atomic(host->regs + SDMMC_CMD, cmd_status, + !(cmd_status & SDMMC_CMD_START), + 1, 500 * USEC_PER_MSEC)) + dev_err(&slot->mmc->class_dev, + "Timeout sending command (cmd %#x arg %#x status %#x)\n", + cmd, arg, cmd_status); +} + +static u32 dw_mci_prepare_command(struct mmc_host *mmc, struct mmc_command *cmd) +{ + struct dw_mci_slot *slot = mmc_priv(mmc); + struct dw_mci *host = slot->host; + u32 cmdr; + + cmd->error = -EINPROGRESS; + cmdr = cmd->opcode; + + if (cmd->opcode == MMC_STOP_TRANSMISSION || + cmd->opcode == MMC_GO_IDLE_STATE || + cmd->opcode == MMC_GO_INACTIVE_STATE || + (cmd->opcode == SD_IO_RW_DIRECT && + ((cmd->arg >> 9) & 0x1FFFF) == SDIO_CCCR_ABORT)) + cmdr |= SDMMC_CMD_STOP; + else if (cmd->opcode != MMC_SEND_STATUS && cmd->data) + cmdr |= SDMMC_CMD_PRV_DAT_WAIT; + + if (cmd->opcode == SD_SWITCH_VOLTAGE) { + u32 clk_en_a; + + /* Special bit makes CMD11 not die */ + cmdr |= SDMMC_CMD_VOLT_SWITCH; + + /* Change state to continue to handle CMD11 weirdness */ + WARN_ON(slot->host->state != STATE_SENDING_CMD); + slot->host->state = STATE_SENDING_CMD11; + + /* + * We need to disable low power mode (automatic clock stop) + * while doing voltage switch so we don't confuse the card, + * since stopping the clock is a specific part of the UHS + * voltage change dance. + * + * Note that low power mode (SDMMC_CLKEN_LOW_PWR) will be + * unconditionally turned back on in dw_mci_setup_bus() if it's + * ever called with a non-zero clock. That shouldn't happen + * until the voltage change is all done. + */ + clk_en_a = mci_readl(host, CLKENA); + clk_en_a &= ~(SDMMC_CLKEN_LOW_PWR << slot->id); + mci_writel(host, CLKENA, clk_en_a); + mci_send_cmd(slot, SDMMC_CMD_UPD_CLK | + SDMMC_CMD_PRV_DAT_WAIT, 0); + } + + if (cmd->flags & MMC_RSP_PRESENT) { + /* We expect a response, so set this bit */ + cmdr |= SDMMC_CMD_RESP_EXP; + if (cmd->flags & MMC_RSP_136) + cmdr |= SDMMC_CMD_RESP_LONG; + } + + if (cmd->flags & MMC_RSP_CRC) + cmdr |= SDMMC_CMD_RESP_CRC; + + if (cmd->data) { + cmdr |= SDMMC_CMD_DAT_EXP; + if (cmd->data->flags & MMC_DATA_WRITE) + cmdr |= SDMMC_CMD_DAT_WR; + } + + if (!test_bit(DW_MMC_CARD_NO_USE_HOLD, &slot->flags)) + cmdr |= SDMMC_CMD_USE_HOLD_REG; + + return cmdr; +} + +static u32 dw_mci_prep_stop_abort(struct dw_mci *host, struct mmc_command *cmd) +{ + struct mmc_command *stop; + u32 cmdr; + + if (!cmd->data) + return 0; + + stop = &host->stop_abort; + cmdr = cmd->opcode; + memset(stop, 0, sizeof(struct mmc_command)); + + if (cmdr == MMC_READ_SINGLE_BLOCK || + cmdr == MMC_READ_MULTIPLE_BLOCK || + cmdr == MMC_WRITE_BLOCK || + cmdr == MMC_WRITE_MULTIPLE_BLOCK || + mmc_op_tuning(cmdr) || + cmdr == MMC_GEN_CMD) { + stop->opcode = MMC_STOP_TRANSMISSION; + stop->arg = 0; + stop->flags = MMC_RSP_R1B | MMC_CMD_AC; + } else if (cmdr == SD_IO_RW_EXTENDED) { + stop->opcode = SD_IO_RW_DIRECT; + stop->arg |= (1 << 31) | (0 << 28) | (SDIO_CCCR_ABORT << 9) | + ((cmd->arg >> 28) & 0x7); + stop->flags = MMC_RSP_SPI_R5 | MMC_RSP_R5 | MMC_CMD_AC; + } else { + return 0; + } + + cmdr = stop->opcode | SDMMC_CMD_STOP | + SDMMC_CMD_RESP_CRC | SDMMC_CMD_RESP_EXP; + + if (!test_bit(DW_MMC_CARD_NO_USE_HOLD, &host->slot->flags)) + cmdr |= SDMMC_CMD_USE_HOLD_REG; + + return cmdr; +} + +static inline void dw_mci_set_cto(struct dw_mci *host) +{ + unsigned int cto_clks; + unsigned int cto_div; + unsigned int cto_ms; + unsigned long irqflags; + + cto_clks = mci_readl(host, TMOUT) & 0xff; + cto_div = (mci_readl(host, CLKDIV) & 0xff) * 2; + if (cto_div == 0) + cto_div = 1; + + cto_ms = DIV_ROUND_UP_ULL((u64)MSEC_PER_SEC * cto_clks * cto_div, + host->bus_hz); + + /* add a bit spare time */ + cto_ms += 10; + + /* + * The durations we're working with are fairly short so we have to be + * extra careful about synchronization here. Specifically in hardware a + * command timeout is _at most_ 5.1 ms, so that means we expect an + * interrupt (either command done or timeout) to come rather quickly + * after the mci_writel. ...but just in case we have a long interrupt + * latency let's add a bit of paranoia. + * + * In general we'll assume that at least an interrupt will be asserted + * in hardware by the time the cto_timer runs. ...and if it hasn't + * been asserted in hardware by that time then we'll assume it'll never + * come. + */ + spin_lock_irqsave(&host->irq_lock, irqflags); + if (!test_bit(EVENT_CMD_COMPLETE, &host->pending_events)) + mod_timer(&host->cto_timer, + jiffies + msecs_to_jiffies(cto_ms) + 1); + spin_unlock_irqrestore(&host->irq_lock, irqflags); +} + +static void dw_mci_start_command(struct dw_mci *host, + struct mmc_command *cmd, u32 cmd_flags) +{ + host->cmd = cmd; + dev_vdbg(host->dev, + "start command: ARGR=0x%08x CMDR=0x%08x\n", + cmd->arg, cmd_flags); + + mci_writel(host, CMDARG, cmd->arg); + wmb(); /* drain writebuffer */ + dw_mci_wait_while_busy(host, cmd_flags); + + mci_writel(host, CMD, cmd_flags | SDMMC_CMD_START); + + /* response expected command only */ + if (cmd_flags & SDMMC_CMD_RESP_EXP) + dw_mci_set_cto(host); +} + +static inline void send_stop_abort(struct dw_mci *host, struct mmc_data *data) +{ + struct mmc_command *stop = &host->stop_abort; + + dw_mci_start_command(host, stop, host->stop_cmdr); +} + +/* DMA interface functions */ +static void dw_mci_stop_dma(struct dw_mci *host) +{ + if (host->using_dma) { + host->dma_ops->stop(host); + host->dma_ops->cleanup(host); + } + + /* Data transfer was stopped by the interrupt handler */ + set_bit(EVENT_XFER_COMPLETE, &host->pending_events); +} + +static void dw_mci_dma_cleanup(struct dw_mci *host) +{ + struct mmc_data *data = host->data; + + if (data && data->host_cookie == COOKIE_MAPPED) { + dma_unmap_sg(host->dev, + data->sg, + data->sg_len, + mmc_get_dma_dir(data)); + data->host_cookie = COOKIE_UNMAPPED; + } +} + +static void dw_mci_idmac_reset(struct dw_mci *host) +{ + u32 bmod = mci_readl(host, BMOD); + /* Software reset of DMA */ + bmod |= SDMMC_IDMAC_SWRESET; + mci_writel(host, BMOD, bmod); +} + +static void dw_mci_idmac_stop_dma(struct dw_mci *host) +{ + u32 temp; + + /* Disable and reset the IDMAC interface */ + temp = mci_readl(host, CTRL); + temp &= ~SDMMC_CTRL_USE_IDMAC; + temp |= SDMMC_CTRL_DMA_RESET; + mci_writel(host, CTRL, temp); + + /* Stop the IDMAC running */ + temp = mci_readl(host, BMOD); + temp &= ~(SDMMC_IDMAC_ENABLE | SDMMC_IDMAC_FB); + temp |= SDMMC_IDMAC_SWRESET; + mci_writel(host, BMOD, temp); +} + +static void dw_mci_dmac_complete_dma(void *arg) +{ + struct dw_mci *host = arg; + struct mmc_data *data = host->data; + + dev_vdbg(host->dev, "DMA complete\n"); + + if ((host->use_dma == TRANS_MODE_EDMAC) && + data && (data->flags & MMC_DATA_READ)) + /* Invalidate cache after read */ + dma_sync_sg_for_cpu(mmc_dev(host->slot->mmc), + data->sg, + data->sg_len, + DMA_FROM_DEVICE); + + host->dma_ops->cleanup(host); + + /* + * If the card was removed, data will be NULL. No point in trying to + * send the stop command or waiting for NBUSY in this case. + */ + if (data) { + set_bit(EVENT_XFER_COMPLETE, &host->pending_events); + tasklet_schedule(&host->tasklet); + } +} + +static int dw_mci_idmac_init(struct dw_mci *host) +{ + int i; + + if (host->dma_64bit_address == 1) { + struct idmac_desc_64addr *p; + /* Number of descriptors in the ring buffer */ + host->ring_size = + DESC_RING_BUF_SZ / sizeof(struct idmac_desc_64addr); + + /* Forward link the descriptor list */ + for (i = 0, p = host->sg_cpu; i < host->ring_size - 1; + i++, p++) { + p->des6 = (host->sg_dma + + (sizeof(struct idmac_desc_64addr) * + (i + 1))) & 0xffffffff; + + p->des7 = (u64)(host->sg_dma + + (sizeof(struct idmac_desc_64addr) * + (i + 1))) >> 32; + /* Initialize reserved and buffer size fields to "0" */ + p->des0 = 0; + p->des1 = 0; + p->des2 = 0; + p->des3 = 0; + } + + /* Set the last descriptor as the end-of-ring descriptor */ + p->des6 = host->sg_dma & 0xffffffff; + p->des7 = (u64)host->sg_dma >> 32; + p->des0 = IDMAC_DES0_ER; + + } else { + struct idmac_desc *p; + /* Number of descriptors in the ring buffer */ + host->ring_size = + DESC_RING_BUF_SZ / sizeof(struct idmac_desc); + + /* Forward link the descriptor list */ + for (i = 0, p = host->sg_cpu; + i < host->ring_size - 1; + i++, p++) { + p->des3 = cpu_to_le32(host->sg_dma + + (sizeof(struct idmac_desc) * (i + 1))); + p->des0 = 0; + p->des1 = 0; + } + + /* Set the last descriptor as the end-of-ring descriptor */ + p->des3 = cpu_to_le32(host->sg_dma); + p->des0 = cpu_to_le32(IDMAC_DES0_ER); + } + + dw_mci_idmac_reset(host); + + if (host->dma_64bit_address == 1) { + /* Mask out interrupts - get Tx & Rx complete only */ + mci_writel(host, IDSTS64, IDMAC_INT_CLR); + mci_writel(host, IDINTEN64, SDMMC_IDMAC_INT_NI | + SDMMC_IDMAC_INT_RI | SDMMC_IDMAC_INT_TI); + + /* Set the descriptor base address */ + mci_writel(host, DBADDRL, host->sg_dma & 0xffffffff); + mci_writel(host, DBADDRU, (u64)host->sg_dma >> 32); + + } else { + /* Mask out interrupts - get Tx & Rx complete only */ + mci_writel(host, IDSTS, IDMAC_INT_CLR); + mci_writel(host, IDINTEN, SDMMC_IDMAC_INT_NI | + SDMMC_IDMAC_INT_RI | SDMMC_IDMAC_INT_TI); + + /* Set the descriptor base address */ + mci_writel(host, DBADDR, host->sg_dma); + } + + return 0; +} + +static inline int dw_mci_prepare_desc64(struct dw_mci *host, + struct mmc_data *data, + unsigned int sg_len) +{ + unsigned int desc_len; + struct idmac_desc_64addr *desc_first, *desc_last, *desc; + u32 val; + int i; + + desc_first = desc_last = desc = host->sg_cpu; + + for (i = 0; i < sg_len; i++) { + unsigned int length = sg_dma_len(&data->sg[i]); + + u64 mem_addr = sg_dma_address(&data->sg[i]); + + for ( ; length ; desc++) { + desc_len = (length <= DW_MCI_DESC_DATA_LENGTH) ? + length : DW_MCI_DESC_DATA_LENGTH; + + length -= desc_len; + + /* + * Wait for the former clear OWN bit operation + * of IDMAC to make sure that this descriptor + * isn't still owned by IDMAC as IDMAC's write + * ops and CPU's read ops are asynchronous. + */ + if (readl_poll_timeout_atomic(&desc->des0, val, + !(val & IDMAC_DES0_OWN), + 10, 100 * USEC_PER_MSEC)) + goto err_own_bit; + + /* + * Set the OWN bit and disable interrupts + * for this descriptor + */ + desc->des0 = IDMAC_DES0_OWN | IDMAC_DES0_DIC | + IDMAC_DES0_CH; + + /* Buffer length */ + IDMAC_64ADDR_SET_BUFFER1_SIZE(desc, desc_len); + + /* Physical address to DMA to/from */ + desc->des4 = mem_addr & 0xffffffff; + desc->des5 = mem_addr >> 32; + + /* Update physical address for the next desc */ + mem_addr += desc_len; + + /* Save pointer to the last descriptor */ + desc_last = desc; + } + } + + /* Set first descriptor */ + desc_first->des0 |= IDMAC_DES0_FD; + + /* Set last descriptor */ + desc_last->des0 &= ~(IDMAC_DES0_CH | IDMAC_DES0_DIC); + desc_last->des0 |= IDMAC_DES0_LD; + + return 0; +err_own_bit: + /* restore the descriptor chain as it's polluted */ + dev_dbg(host->dev, "descriptor is still owned by IDMAC.\n"); + memset(host->sg_cpu, 0, DESC_RING_BUF_SZ); + dw_mci_idmac_init(host); + return -EINVAL; +} + + +static inline int dw_mci_prepare_desc32(struct dw_mci *host, + struct mmc_data *data, + unsigned int sg_len) +{ + unsigned int desc_len; + struct idmac_desc *desc_first, *desc_last, *desc; + u32 val; + int i; + + desc_first = desc_last = desc = host->sg_cpu; + + for (i = 0; i < sg_len; i++) { + unsigned int length = sg_dma_len(&data->sg[i]); + + u32 mem_addr = sg_dma_address(&data->sg[i]); + + for ( ; length ; desc++) { + desc_len = (length <= DW_MCI_DESC_DATA_LENGTH) ? + length : DW_MCI_DESC_DATA_LENGTH; + + length -= desc_len; + + /* + * Wait for the former clear OWN bit operation + * of IDMAC to make sure that this descriptor + * isn't still owned by IDMAC as IDMAC's write + * ops and CPU's read ops are asynchronous. + */ + if (readl_poll_timeout_atomic(&desc->des0, val, + IDMAC_OWN_CLR64(val), + 10, + 100 * USEC_PER_MSEC)) + goto err_own_bit; + + /* + * Set the OWN bit and disable interrupts + * for this descriptor + */ + desc->des0 = cpu_to_le32(IDMAC_DES0_OWN | + IDMAC_DES0_DIC | + IDMAC_DES0_CH); + + /* Buffer length */ + IDMAC_SET_BUFFER1_SIZE(desc, desc_len); + + /* Physical address to DMA to/from */ + desc->des2 = cpu_to_le32(mem_addr); + + /* Update physical address for the next desc */ + mem_addr += desc_len; + + /* Save pointer to the last descriptor */ + desc_last = desc; + } + } + + /* Set first descriptor */ + desc_first->des0 |= cpu_to_le32(IDMAC_DES0_FD); + + /* Set last descriptor */ + desc_last->des0 &= cpu_to_le32(~(IDMAC_DES0_CH | + IDMAC_DES0_DIC)); + desc_last->des0 |= cpu_to_le32(IDMAC_DES0_LD); + + return 0; +err_own_bit: + /* restore the descriptor chain as it's polluted */ + dev_dbg(host->dev, "descriptor is still owned by IDMAC.\n"); + memset(host->sg_cpu, 0, DESC_RING_BUF_SZ); + dw_mci_idmac_init(host); + return -EINVAL; +} + +static int dw_mci_idmac_start_dma(struct dw_mci *host, unsigned int sg_len) +{ + u32 temp; + int ret; + + if (host->dma_64bit_address == 1) + ret = dw_mci_prepare_desc64(host, host->data, sg_len); + else + ret = dw_mci_prepare_desc32(host, host->data, sg_len); + + if (ret) + goto out; + + /* drain writebuffer */ + wmb(); + + /* Make sure to reset DMA in case we did PIO before this */ + dw_mci_ctrl_reset(host, SDMMC_CTRL_DMA_RESET); + dw_mci_idmac_reset(host); + + /* Select IDMAC interface */ + temp = mci_readl(host, CTRL); + temp |= SDMMC_CTRL_USE_IDMAC; + mci_writel(host, CTRL, temp); + + /* drain writebuffer */ + wmb(); + + /* Enable the IDMAC */ + temp = mci_readl(host, BMOD); + temp |= SDMMC_IDMAC_ENABLE | SDMMC_IDMAC_FB; + mci_writel(host, BMOD, temp); + + /* Start it running */ + mci_writel(host, PLDMND, 1); + +out: + return ret; +} + +static const struct dw_mci_dma_ops dw_mci_idmac_ops = { + .init = dw_mci_idmac_init, + .start = dw_mci_idmac_start_dma, + .stop = dw_mci_idmac_stop_dma, + .complete = dw_mci_dmac_complete_dma, + .cleanup = dw_mci_dma_cleanup, +}; + +static void dw_mci_edmac_stop_dma(struct dw_mci *host) +{ + dmaengine_terminate_async(host->dms->ch); +} + +static int dw_mci_edmac_start_dma(struct dw_mci *host, + unsigned int sg_len) +{ + struct dma_slave_config cfg; + struct dma_async_tx_descriptor *desc = NULL; + struct scatterlist *sgl = host->data->sg; + static const u32 mszs[] = {1, 4, 8, 16, 32, 64, 128, 256}; + u32 sg_elems = host->data->sg_len; + u32 fifoth_val; + u32 fifo_offset = host->fifo_reg - host->regs; + int ret = 0; + + /* Set external dma config: burst size, burst width */ + memset(&cfg, 0, sizeof(cfg)); + cfg.dst_addr = host->phy_regs + fifo_offset; + cfg.src_addr = cfg.dst_addr; + cfg.dst_addr_width = DMA_SLAVE_BUSWIDTH_4_BYTES; + cfg.src_addr_width = DMA_SLAVE_BUSWIDTH_4_BYTES; + + /* Match burst msize with external dma config */ + fifoth_val = mci_readl(host, FIFOTH); + cfg.dst_maxburst = mszs[(fifoth_val >> 28) & 0x7]; + cfg.src_maxburst = cfg.dst_maxburst; + + if (host->data->flags & MMC_DATA_WRITE) + cfg.direction = DMA_MEM_TO_DEV; + else + cfg.direction = DMA_DEV_TO_MEM; + + ret = dmaengine_slave_config(host->dms->ch, &cfg); + if (ret) { + dev_err(host->dev, "Failed to config edmac.\n"); + return -EBUSY; + } + + desc = dmaengine_prep_slave_sg(host->dms->ch, sgl, + sg_len, cfg.direction, + DMA_PREP_INTERRUPT | DMA_CTRL_ACK); + if (!desc) { + dev_err(host->dev, "Can't prepare slave sg.\n"); + return -EBUSY; + } + + /* Set dw_mci_dmac_complete_dma as callback */ + desc->callback = dw_mci_dmac_complete_dma; + desc->callback_param = (void *)host; + dmaengine_submit(desc); + + /* Flush cache before write */ + if (host->data->flags & MMC_DATA_WRITE) + dma_sync_sg_for_device(mmc_dev(host->slot->mmc), sgl, + sg_elems, DMA_TO_DEVICE); + + dma_async_issue_pending(host->dms->ch); + + return 0; +} + +static int dw_mci_edmac_init(struct dw_mci *host) +{ + /* Request external dma channel */ + host->dms = kzalloc(sizeof(struct dw_mci_dma_slave), GFP_KERNEL); + if (!host->dms) + return -ENOMEM; + + host->dms->ch = dma_request_chan(host->dev, "rx-tx"); + if (IS_ERR(host->dms->ch)) { + int ret = PTR_ERR(host->dms->ch); + + dev_err(host->dev, "Failed to get external DMA channel.\n"); + kfree(host->dms); + host->dms = NULL; + return ret; + } + + return 0; +} + +static void dw_mci_edmac_exit(struct dw_mci *host) +{ + if (host->dms) { + if (host->dms->ch) { + dma_release_channel(host->dms->ch); + host->dms->ch = NULL; + } + kfree(host->dms); + host->dms = NULL; + } +} + +static const struct dw_mci_dma_ops dw_mci_edmac_ops = { + .init = dw_mci_edmac_init, + .exit = dw_mci_edmac_exit, + .start = dw_mci_edmac_start_dma, + .stop = dw_mci_edmac_stop_dma, + .complete = dw_mci_dmac_complete_dma, + .cleanup = dw_mci_dma_cleanup, +}; + +static int dw_mci_pre_dma_transfer(struct dw_mci *host, + struct mmc_data *data, + int cookie) +{ + struct scatterlist *sg; + unsigned int i, sg_len; + + if (data->host_cookie == COOKIE_PRE_MAPPED) + return data->sg_len; + + /* + * We don't do DMA on "complex" transfers, i.e. with + * non-word-aligned buffers or lengths. Also, we don't bother + * with all the DMA setup overhead for short transfers. + */ + if (data->blocks * data->blksz < DW_MCI_DMA_THRESHOLD) + return -EINVAL; + + if (data->blksz & 3) + return -EINVAL; + + for_each_sg(data->sg, sg, data->sg_len, i) { + if (sg->offset & 3 || sg->length & 3) + return -EINVAL; + } + + sg_len = dma_map_sg(host->dev, + data->sg, + data->sg_len, + mmc_get_dma_dir(data)); + if (sg_len == 0) + return -EINVAL; + + data->host_cookie = cookie; + + return sg_len; +} + +static void dw_mci_pre_req(struct mmc_host *mmc, + struct mmc_request *mrq) +{ + struct dw_mci_slot *slot = mmc_priv(mmc); + struct mmc_data *data = mrq->data; + + if (!slot->host->use_dma || !data) + return; + + /* This data might be unmapped at this time */ + data->host_cookie = COOKIE_UNMAPPED; + + if (dw_mci_pre_dma_transfer(slot->host, mrq->data, + COOKIE_PRE_MAPPED) < 0) + data->host_cookie = COOKIE_UNMAPPED; +} + +static void dw_mci_post_req(struct mmc_host *mmc, + struct mmc_request *mrq, + int err) +{ + struct dw_mci_slot *slot = mmc_priv(mmc); + struct mmc_data *data = mrq->data; + + if (!slot->host->use_dma || !data) + return; + + if (data->host_cookie != COOKIE_UNMAPPED) + dma_unmap_sg(slot->host->dev, + data->sg, + data->sg_len, + mmc_get_dma_dir(data)); + data->host_cookie = COOKIE_UNMAPPED; +} + +static int dw_mci_get_cd(struct mmc_host *mmc) +{ + int present; + struct dw_mci_slot *slot = mmc_priv(mmc); + struct dw_mci *host = slot->host; + int gpio_cd = mmc_gpio_get_cd(mmc); + + /* Use platform get_cd function, else try onboard card detect */ + if (((mmc->caps & MMC_CAP_NEEDS_POLL) + || !mmc_card_is_removable(mmc))) { + present = 1; + + if (!test_bit(DW_MMC_CARD_PRESENT, &slot->flags)) { + if (mmc->caps & MMC_CAP_NEEDS_POLL) { + dev_info(&mmc->class_dev, + "card is polling.\n"); + } else { + dev_info(&mmc->class_dev, + "card is non-removable.\n"); + } + set_bit(DW_MMC_CARD_PRESENT, &slot->flags); + } + + return present; + } else if (gpio_cd >= 0) + present = gpio_cd; + else + present = (mci_readl(slot->host, CDETECT) & (1 << slot->id)) + == 0 ? 1 : 0; + + spin_lock_bh(&host->lock); + if (present && !test_and_set_bit(DW_MMC_CARD_PRESENT, &slot->flags)) + dev_dbg(&mmc->class_dev, "card is present\n"); + else if (!present && + !test_and_clear_bit(DW_MMC_CARD_PRESENT, &slot->flags)) + dev_dbg(&mmc->class_dev, "card is not present\n"); + spin_unlock_bh(&host->lock); + + return present; +} + +static void dw_mci_adjust_fifoth(struct dw_mci *host, struct mmc_data *data) +{ + unsigned int blksz = data->blksz; + static const u32 mszs[] = {1, 4, 8, 16, 32, 64, 128, 256}; + u32 fifo_width = 1 << host->data_shift; + u32 blksz_depth = blksz / fifo_width, fifoth_val; + u32 msize = 0, rx_wmark = 1, tx_wmark, tx_wmark_invers; + int idx = ARRAY_SIZE(mszs) - 1; + + /* pio should ship this scenario */ + if (!host->use_dma) + return; + + tx_wmark = (host->fifo_depth) / 2; + tx_wmark_invers = host->fifo_depth - tx_wmark; + + /* + * MSIZE is '1', + * if blksz is not a multiple of the FIFO width + */ + if (blksz % fifo_width) + goto done; + + do { + if (!((blksz_depth % mszs[idx]) || + (tx_wmark_invers % mszs[idx]))) { + msize = idx; + rx_wmark = mszs[idx] - 1; + break; + } + } while (--idx > 0); + /* + * If idx is '0', it won't be tried + * Thus, initial values are uesed + */ +done: + fifoth_val = SDMMC_SET_FIFOTH(msize, rx_wmark, tx_wmark); + mci_writel(host, FIFOTH, fifoth_val); +} + +static void dw_mci_ctrl_thld(struct dw_mci *host, struct mmc_data *data) +{ + unsigned int blksz = data->blksz; + u32 blksz_depth, fifo_depth; + u16 thld_size; + u8 enable; + + /* + * CDTHRCTL doesn't exist prior to 240A (in fact that register offset is + * in the FIFO region, so we really shouldn't access it). + */ + if (host->verid < DW_MMC_240A || + (host->verid < DW_MMC_280A && data->flags & MMC_DATA_WRITE)) + return; + + /* + * Card write Threshold is introduced since 2.80a + * It's used when HS400 mode is enabled. + */ + if (data->flags & MMC_DATA_WRITE && + host->timing != MMC_TIMING_MMC_HS400) + goto disable; + + if (data->flags & MMC_DATA_WRITE) + enable = SDMMC_CARD_WR_THR_EN; + else + enable = SDMMC_CARD_RD_THR_EN; + + if (host->timing != MMC_TIMING_MMC_HS200 && + host->timing != MMC_TIMING_UHS_SDR104 && + host->timing != MMC_TIMING_MMC_HS400) + goto disable; + + blksz_depth = blksz / (1 << host->data_shift); + fifo_depth = host->fifo_depth; + + if (blksz_depth > fifo_depth) + goto disable; + + /* + * If (blksz_depth) >= (fifo_depth >> 1), should be 'thld_size <= blksz' + * If (blksz_depth) < (fifo_depth >> 1), should be thld_size = blksz + * Currently just choose blksz. + */ + thld_size = blksz; + mci_writel(host, CDTHRCTL, SDMMC_SET_THLD(thld_size, enable)); + return; + +disable: + mci_writel(host, CDTHRCTL, 0); +} + +static int dw_mci_submit_data_dma(struct dw_mci *host, struct mmc_data *data) +{ + unsigned long irqflags; + int sg_len; + u32 temp; + + host->using_dma = 0; + + /* If we don't have a channel, we can't do DMA */ + if (!host->use_dma) + return -ENODEV; + + sg_len = dw_mci_pre_dma_transfer(host, data, COOKIE_MAPPED); + if (sg_len < 0) { + host->dma_ops->stop(host); + return sg_len; + } + + host->using_dma = 1; + + if (host->use_dma == TRANS_MODE_IDMAC) + dev_vdbg(host->dev, + "sd sg_cpu: %#lx sg_dma: %#lx sg_len: %d\n", + (unsigned long)host->sg_cpu, + (unsigned long)host->sg_dma, + sg_len); + + /* + * Decide the MSIZE and RX/TX Watermark. + * If current block size is same with previous size, + * no need to update fifoth. + */ + if (host->prev_blksz != data->blksz) + dw_mci_adjust_fifoth(host, data); + + /* Enable the DMA interface */ + temp = mci_readl(host, CTRL); + temp |= SDMMC_CTRL_DMA_ENABLE; + mci_writel(host, CTRL, temp); + + /* Disable RX/TX IRQs, let DMA handle it */ + spin_lock_irqsave(&host->irq_lock, irqflags); + temp = mci_readl(host, INTMASK); + temp &= ~(SDMMC_INT_RXDR | SDMMC_INT_TXDR); + mci_writel(host, INTMASK, temp); + spin_unlock_irqrestore(&host->irq_lock, irqflags); + + if (host->dma_ops->start(host, sg_len)) { + host->dma_ops->stop(host); + /* We can't do DMA, try PIO for this one */ + dev_dbg(host->dev, + "%s: fall back to PIO mode for current transfer\n", + __func__); + return -ENODEV; + } + + return 0; +} + +static void dw_mci_submit_data(struct dw_mci *host, struct mmc_data *data) +{ + unsigned long irqflags; + int flags = SG_MITER_ATOMIC; + u32 temp; + + data->error = -EINPROGRESS; + + WARN_ON(host->data); + host->sg = NULL; + host->data = data; + + if (data->flags & MMC_DATA_READ) + host->dir_status = DW_MCI_RECV_STATUS; + else + host->dir_status = DW_MCI_SEND_STATUS; + + dw_mci_ctrl_thld(host, data); + + if (dw_mci_submit_data_dma(host, data)) { + if (host->data->flags & MMC_DATA_READ) + flags |= SG_MITER_TO_SG; + else + flags |= SG_MITER_FROM_SG; + + sg_miter_start(&host->sg_miter, data->sg, data->sg_len, flags); + host->sg = data->sg; + host->part_buf_start = 0; + host->part_buf_count = 0; + + mci_writel(host, RINTSTS, SDMMC_INT_TXDR | SDMMC_INT_RXDR); + + spin_lock_irqsave(&host->irq_lock, irqflags); + temp = mci_readl(host, INTMASK); + temp |= SDMMC_INT_TXDR | SDMMC_INT_RXDR; + mci_writel(host, INTMASK, temp); + spin_unlock_irqrestore(&host->irq_lock, irqflags); + + temp = mci_readl(host, CTRL); + temp &= ~SDMMC_CTRL_DMA_ENABLE; + mci_writel(host, CTRL, temp); + + /* + * Use the initial fifoth_val for PIO mode. If wm_algined + * is set, we set watermark same as data size. + * If next issued data may be transfered by DMA mode, + * prev_blksz should be invalidated. + */ + if (host->wm_aligned) + dw_mci_adjust_fifoth(host, data); + else + mci_writel(host, FIFOTH, host->fifoth_val); + host->prev_blksz = 0; + } else { + /* + * Keep the current block size. + * It will be used to decide whether to update + * fifoth register next time. + */ + host->prev_blksz = data->blksz; + } +} + +static void dw_mci_setup_bus(struct dw_mci_slot *slot, bool force_clkinit) +{ + struct dw_mci *host = slot->host; + unsigned int clock = slot->clock; + u32 div; + u32 clk_en_a; + u32 sdmmc_cmd_bits = SDMMC_CMD_UPD_CLK | SDMMC_CMD_PRV_DAT_WAIT; + + /* We must continue to set bit 28 in CMD until the change is complete */ + if (host->state == STATE_WAITING_CMD11_DONE) + sdmmc_cmd_bits |= SDMMC_CMD_VOLT_SWITCH; + + slot->mmc->actual_clock = 0; + + if (!clock) { + mci_writel(host, CLKENA, 0); + mci_send_cmd(slot, sdmmc_cmd_bits, 0); + } else if (clock != host->current_speed || force_clkinit) { + div = host->bus_hz / clock; + if (host->bus_hz % clock && host->bus_hz > clock) + /* + * move the + 1 after the divide to prevent + * over-clocking the card. + */ + div += 1; + + div = (host->bus_hz != clock) ? DIV_ROUND_UP(div, 2) : 0; + + if ((clock != slot->__clk_old && + !test_bit(DW_MMC_CARD_NEEDS_POLL, &slot->flags)) || + force_clkinit) { + /* Silent the verbose log if calling from PM context */ + if (!force_clkinit) + dev_info(&slot->mmc->class_dev, + "Bus speed (slot %d) = %dHz (slot req %dHz, actual %dHZ div = %d)\n", + slot->id, host->bus_hz, clock, + div ? ((host->bus_hz / div) >> 1) : + host->bus_hz, div); + + /* + * If card is polling, display the message only + * one time at boot time. + */ + if (slot->mmc->caps & MMC_CAP_NEEDS_POLL && + slot->mmc->f_min == clock) + set_bit(DW_MMC_CARD_NEEDS_POLL, &slot->flags); + } + + /* disable clock */ + mci_writel(host, CLKENA, 0); + mci_writel(host, CLKSRC, 0); + + /* inform CIU */ + mci_send_cmd(slot, sdmmc_cmd_bits, 0); + + /* set clock to desired speed */ + mci_writel(host, CLKDIV, div); + + /* inform CIU */ + mci_send_cmd(slot, sdmmc_cmd_bits, 0); + + /* enable clock; only low power if no SDIO */ + clk_en_a = SDMMC_CLKEN_ENABLE << slot->id; + if (!test_bit(DW_MMC_CARD_NO_LOW_PWR, &slot->flags)) + clk_en_a |= SDMMC_CLKEN_LOW_PWR << slot->id; + mci_writel(host, CLKENA, clk_en_a); + + /* inform CIU */ + mci_send_cmd(slot, sdmmc_cmd_bits, 0); + + /* keep the last clock value that was requested from core */ + slot->__clk_old = clock; + slot->mmc->actual_clock = div ? ((host->bus_hz / div) >> 1) : + host->bus_hz; + } + + host->current_speed = clock; + + /* Set the current slot bus width */ + mci_writel(host, CTYPE, (slot->ctype << slot->id)); +} + +static void dw_mci_set_data_timeout(struct dw_mci *host, + unsigned int timeout_ns) +{ + const struct dw_mci_drv_data *drv_data = host->drv_data; + u32 clk_div, tmout; + u64 tmp; + + if (drv_data && drv_data->set_data_timeout) + return drv_data->set_data_timeout(host, timeout_ns); + + clk_div = (mci_readl(host, CLKDIV) & 0xFF) * 2; + if (clk_div == 0) + clk_div = 1; + + tmp = DIV_ROUND_UP_ULL((u64)timeout_ns * host->bus_hz, NSEC_PER_SEC); + tmp = DIV_ROUND_UP_ULL(tmp, clk_div); + + /* TMOUT[7:0] (RESPONSE_TIMEOUT) */ + tmout = 0xFF; /* Set maximum */ + + /* TMOUT[31:8] (DATA_TIMEOUT) */ + if (!tmp || tmp > 0xFFFFFF) + tmout |= (0xFFFFFF << 8); + else + tmout |= (tmp & 0xFFFFFF) << 8; + + mci_writel(host, TMOUT, tmout); + dev_dbg(host->dev, "timeout_ns: %u => TMOUT[31:8]: %#08x", + timeout_ns, tmout >> 8); +} + +static void __dw_mci_start_request(struct dw_mci *host, + struct dw_mci_slot *slot, + struct mmc_command *cmd) +{ + struct mmc_request *mrq; + struct mmc_data *data; + u32 cmdflags; + + mrq = slot->mrq; + + host->mrq = mrq; + + host->pending_events = 0; + host->completed_events = 0; + host->cmd_status = 0; + host->data_status = 0; + host->dir_status = 0; + + data = cmd->data; + if (data) { + dw_mci_set_data_timeout(host, data->timeout_ns); + mci_writel(host, BYTCNT, data->blksz*data->blocks); + mci_writel(host, BLKSIZ, data->blksz); + } + + cmdflags = dw_mci_prepare_command(slot->mmc, cmd); + + /* this is the first command, send the initialization clock */ + if (test_and_clear_bit(DW_MMC_CARD_NEED_INIT, &slot->flags)) + cmdflags |= SDMMC_CMD_INIT; + + if (data) { + dw_mci_submit_data(host, data); + wmb(); /* drain writebuffer */ + } + + dw_mci_start_command(host, cmd, cmdflags); + + if (cmd->opcode == SD_SWITCH_VOLTAGE) { + unsigned long irqflags; + + /* + * Databook says to fail after 2ms w/ no response, but evidence + * shows that sometimes the cmd11 interrupt takes over 130ms. + * We'll set to 500ms, plus an extra jiffy just in case jiffies + * is just about to roll over. + * + * We do this whole thing under spinlock and only if the + * command hasn't already completed (indicating the irq + * already ran so we don't want the timeout). + */ + spin_lock_irqsave(&host->irq_lock, irqflags); + if (!test_bit(EVENT_CMD_COMPLETE, &host->pending_events)) + mod_timer(&host->cmd11_timer, + jiffies + msecs_to_jiffies(500) + 1); + spin_unlock_irqrestore(&host->irq_lock, irqflags); + } + + host->stop_cmdr = dw_mci_prep_stop_abort(host, cmd); +} + +static void dw_mci_start_request(struct dw_mci *host, + struct dw_mci_slot *slot) +{ + struct mmc_request *mrq = slot->mrq; + struct mmc_command *cmd; + + cmd = mrq->sbc ? mrq->sbc : mrq->cmd; + __dw_mci_start_request(host, slot, cmd); +} + +/* must be called with host->lock held */ +static void dw_mci_queue_request(struct dw_mci *host, struct dw_mci_slot *slot, + struct mmc_request *mrq) +{ + dev_vdbg(&slot->mmc->class_dev, "queue request: state=%d\n", + host->state); + + slot->mrq = mrq; + + if (host->state == STATE_WAITING_CMD11_DONE) { + dev_warn(&slot->mmc->class_dev, + "Voltage change didn't complete\n"); + /* + * this case isn't expected to happen, so we can + * either crash here or just try to continue on + * in the closest possible state + */ + host->state = STATE_IDLE; + } + + if (host->state == STATE_IDLE) { + host->state = STATE_SENDING_CMD; + dw_mci_start_request(host, slot); + } else { + list_add_tail(&slot->queue_node, &host->queue); + } +} + +static void dw_mci_request(struct mmc_host *mmc, struct mmc_request *mrq) +{ + struct dw_mci_slot *slot = mmc_priv(mmc); + struct dw_mci *host = slot->host; + + WARN_ON(slot->mrq); + + /* + * The check for card presence and queueing of the request must be + * atomic, otherwise the card could be removed in between and the + * request wouldn't fail until another card was inserted. + */ + + if (!dw_mci_get_cd(mmc)) { + mrq->cmd->error = -ENOMEDIUM; + mmc_request_done(mmc, mrq); + return; + } + + spin_lock_bh(&host->lock); + + dw_mci_queue_request(host, slot, mrq); + + spin_unlock_bh(&host->lock); +} + +static void dw_mci_set_ios(struct mmc_host *mmc, struct mmc_ios *ios) +{ + struct dw_mci_slot *slot = mmc_priv(mmc); + const struct dw_mci_drv_data *drv_data = slot->host->drv_data; + u32 regs; + int ret; + + switch (ios->bus_width) { + case MMC_BUS_WIDTH_4: + slot->ctype = SDMMC_CTYPE_4BIT; + break; + case MMC_BUS_WIDTH_8: + slot->ctype = SDMMC_CTYPE_8BIT; + break; + default: + /* set default 1 bit mode */ + slot->ctype = SDMMC_CTYPE_1BIT; + } + + regs = mci_readl(slot->host, UHS_REG); + + /* DDR mode set */ + if (ios->timing == MMC_TIMING_MMC_DDR52 || + ios->timing == MMC_TIMING_UHS_DDR50 || + ios->timing == MMC_TIMING_MMC_HS400) + regs |= ((0x1 << slot->id) << 16); + else + regs &= ~((0x1 << slot->id) << 16); + + mci_writel(slot->host, UHS_REG, regs); + slot->host->timing = ios->timing; + + /* + * Use mirror of ios->clock to prevent race with mmc + * core ios update when finding the minimum. + */ + slot->clock = ios->clock; + + if (drv_data && drv_data->set_ios) + drv_data->set_ios(slot->host, ios); + + switch (ios->power_mode) { + case MMC_POWER_UP: + if (!IS_ERR(mmc->supply.vmmc)) { + ret = mmc_regulator_set_ocr(mmc, mmc->supply.vmmc, + ios->vdd); + if (ret) { + dev_err(slot->host->dev, + "failed to enable vmmc regulator\n"); + /*return, if failed turn on vmmc*/ + return; + } + } + set_bit(DW_MMC_CARD_NEED_INIT, &slot->flags); + regs = mci_readl(slot->host, PWREN); + regs |= (1 << slot->id); + mci_writel(slot->host, PWREN, regs); + break; + case MMC_POWER_ON: + if (!slot->host->vqmmc_enabled) { + if (!IS_ERR(mmc->supply.vqmmc)) { + ret = regulator_enable(mmc->supply.vqmmc); + if (ret < 0) + dev_err(slot->host->dev, + "failed to enable vqmmc\n"); + else + slot->host->vqmmc_enabled = true; + + } else { + /* Keep track so we don't reset again */ + slot->host->vqmmc_enabled = true; + } + + /* Reset our state machine after powering on */ + dw_mci_ctrl_reset(slot->host, + SDMMC_CTRL_ALL_RESET_FLAGS); + } + + /* Adjust clock / bus width after power is up */ + dw_mci_setup_bus(slot, false); + + break; + case MMC_POWER_OFF: + /* Turn clock off before power goes down */ + dw_mci_setup_bus(slot, false); + + if (!IS_ERR(mmc->supply.vmmc)) + mmc_regulator_set_ocr(mmc, mmc->supply.vmmc, 0); + + if (!IS_ERR(mmc->supply.vqmmc) && slot->host->vqmmc_enabled) + regulator_disable(mmc->supply.vqmmc); + slot->host->vqmmc_enabled = false; + + regs = mci_readl(slot->host, PWREN); + regs &= ~(1 << slot->id); + mci_writel(slot->host, PWREN, regs); + break; + default: + break; + } + + if (slot->host->state == STATE_WAITING_CMD11_DONE && ios->clock != 0) + slot->host->state = STATE_IDLE; +} + +static int dw_mci_card_busy(struct mmc_host *mmc) +{ + struct dw_mci_slot *slot = mmc_priv(mmc); + u32 status; + + /* + * Check the busy bit which is low when DAT[3:0] + * (the data lines) are 0000 + */ + status = mci_readl(slot->host, STATUS); + + return !!(status & SDMMC_STATUS_BUSY); +} + +static int dw_mci_switch_voltage(struct mmc_host *mmc, struct mmc_ios *ios) +{ + struct dw_mci_slot *slot = mmc_priv(mmc); + struct dw_mci *host = slot->host; + const struct dw_mci_drv_data *drv_data = host->drv_data; + u32 uhs; + u32 v18 = SDMMC_UHS_18V << slot->id; + int ret; + + if (drv_data && drv_data->switch_voltage) + return drv_data->switch_voltage(mmc, ios); + + /* + * Program the voltage. Note that some instances of dw_mmc may use + * the UHS_REG for this. For other instances (like exynos) the UHS_REG + * does no harm but you need to set the regulator directly. Try both. + */ + uhs = mci_readl(host, UHS_REG); + if (ios->signal_voltage == MMC_SIGNAL_VOLTAGE_330) + uhs &= ~v18; + else + uhs |= v18; + + if (!IS_ERR(mmc->supply.vqmmc)) { + ret = mmc_regulator_set_vqmmc(mmc, ios); + if (ret < 0) { + dev_dbg(&mmc->class_dev, + "Regulator set error %d - %s V\n", + ret, uhs & v18 ? "1.8" : "3.3"); + return ret; + } + } + mci_writel(host, UHS_REG, uhs); + + return 0; +} + +static int dw_mci_get_ro(struct mmc_host *mmc) +{ + int read_only; + struct dw_mci_slot *slot = mmc_priv(mmc); + int gpio_ro = mmc_gpio_get_ro(mmc); + + /* Use platform get_ro function, else try on board write protect */ + if (gpio_ro >= 0) + read_only = gpio_ro; + else + read_only = + mci_readl(slot->host, WRTPRT) & (1 << slot->id) ? 1 : 0; + + dev_dbg(&mmc->class_dev, "card is %s\n", + read_only ? "read-only" : "read-write"); + + return read_only; +} + +static void dw_mci_hw_reset(struct mmc_host *mmc) +{ + struct dw_mci_slot *slot = mmc_priv(mmc); + struct dw_mci *host = slot->host; + int reset; + + if (host->use_dma == TRANS_MODE_IDMAC) + dw_mci_idmac_reset(host); + + if (!dw_mci_ctrl_reset(host, SDMMC_CTRL_DMA_RESET | + SDMMC_CTRL_FIFO_RESET)) + return; + + /* + * According to eMMC spec, card reset procedure: + * tRstW >= 1us: RST_n pulse width + * tRSCA >= 200us: RST_n to Command time + * tRSTH >= 1us: RST_n high period + */ + reset = mci_readl(host, RST_N); + reset &= ~(SDMMC_RST_HWACTIVE << slot->id); + mci_writel(host, RST_N, reset); + usleep_range(1, 2); + reset |= SDMMC_RST_HWACTIVE << slot->id; + mci_writel(host, RST_N, reset); + usleep_range(200, 300); +} + +static void dw_mci_prepare_sdio_irq(struct dw_mci_slot *slot, bool prepare) +{ + struct dw_mci *host = slot->host; + const u32 clken_low_pwr = SDMMC_CLKEN_LOW_PWR << slot->id; + u32 clk_en_a_old; + u32 clk_en_a; + + /* + * Low power mode will stop the card clock when idle. According to the + * description of the CLKENA register we should disable low power mode + * for SDIO cards if we need SDIO interrupts to work. + */ + + clk_en_a_old = mci_readl(host, CLKENA); + if (prepare) { + set_bit(DW_MMC_CARD_NO_LOW_PWR, &slot->flags); + clk_en_a = clk_en_a_old & ~clken_low_pwr; + } else { + clear_bit(DW_MMC_CARD_NO_LOW_PWR, &slot->flags); + clk_en_a = clk_en_a_old | clken_low_pwr; + } + + if (clk_en_a != clk_en_a_old) { + mci_writel(host, CLKENA, clk_en_a); + mci_send_cmd(slot, SDMMC_CMD_UPD_CLK | SDMMC_CMD_PRV_DAT_WAIT, + 0); + } +} + +static void __dw_mci_enable_sdio_irq(struct dw_mci_slot *slot, int enb) +{ + struct dw_mci *host = slot->host; + unsigned long irqflags; + u32 int_mask; + + spin_lock_irqsave(&host->irq_lock, irqflags); + + /* Enable/disable Slot Specific SDIO interrupt */ + int_mask = mci_readl(host, INTMASK); + if (enb) + int_mask |= SDMMC_INT_SDIO(slot->sdio_id); + else + int_mask &= ~SDMMC_INT_SDIO(slot->sdio_id); + mci_writel(host, INTMASK, int_mask); + + spin_unlock_irqrestore(&host->irq_lock, irqflags); +} + +static void dw_mci_enable_sdio_irq(struct mmc_host *mmc, int enb) +{ + struct dw_mci_slot *slot = mmc_priv(mmc); + struct dw_mci *host = slot->host; + + dw_mci_prepare_sdio_irq(slot, enb); + __dw_mci_enable_sdio_irq(slot, enb); + + /* Avoid runtime suspending the device when SDIO IRQ is enabled */ + if (enb) + pm_runtime_get_noresume(host->dev); + else + pm_runtime_put_noidle(host->dev); +} + +static void dw_mci_ack_sdio_irq(struct mmc_host *mmc) +{ + struct dw_mci_slot *slot = mmc_priv(mmc); + + __dw_mci_enable_sdio_irq(slot, 1); +} + +static int dw_mci_execute_tuning(struct mmc_host *mmc, u32 opcode) +{ + struct dw_mci_slot *slot = mmc_priv(mmc); + struct dw_mci *host = slot->host; + const struct dw_mci_drv_data *drv_data = host->drv_data; + int err = -EINVAL; + + if (drv_data && drv_data->execute_tuning) + err = drv_data->execute_tuning(slot, opcode); + return err; +} + +static int dw_mci_prepare_hs400_tuning(struct mmc_host *mmc, + struct mmc_ios *ios) +{ + struct dw_mci_slot *slot = mmc_priv(mmc); + struct dw_mci *host = slot->host; + const struct dw_mci_drv_data *drv_data = host->drv_data; + + if (drv_data && drv_data->prepare_hs400_tuning) + return drv_data->prepare_hs400_tuning(host, ios); + + return 0; +} + +static bool dw_mci_reset(struct dw_mci *host) +{ + u32 flags = SDMMC_CTRL_RESET | SDMMC_CTRL_FIFO_RESET; + bool ret = false; + u32 status = 0; + + /* + * Resetting generates a block interrupt, hence setting + * the scatter-gather pointer to NULL. + */ + if (host->sg) { + sg_miter_stop(&host->sg_miter); + host->sg = NULL; + } + + if (host->use_dma) + flags |= SDMMC_CTRL_DMA_RESET; + + if (dw_mci_ctrl_reset(host, flags)) { + /* + * In all cases we clear the RAWINTS + * register to clear any interrupts. + */ + mci_writel(host, RINTSTS, 0xFFFFFFFF); + + if (!host->use_dma) { + ret = true; + goto ciu_out; + } + + /* Wait for dma_req to be cleared */ + if (readl_poll_timeout_atomic(host->regs + SDMMC_STATUS, + status, + !(status & SDMMC_STATUS_DMA_REQ), + 1, 500 * USEC_PER_MSEC)) { + dev_err(host->dev, + "%s: Timeout waiting for dma_req to be cleared\n", + __func__); + goto ciu_out; + } + + /* when using DMA next we reset the fifo again */ + if (!dw_mci_ctrl_reset(host, SDMMC_CTRL_FIFO_RESET)) + goto ciu_out; + } else { + /* if the controller reset bit did clear, then set clock regs */ + if (!(mci_readl(host, CTRL) & SDMMC_CTRL_RESET)) { + dev_err(host->dev, + "%s: fifo/dma reset bits didn't clear but ciu was reset, doing clock update\n", + __func__); + goto ciu_out; + } + } + + if (host->use_dma == TRANS_MODE_IDMAC) + /* It is also required that we reinit idmac */ + dw_mci_idmac_init(host); + + ret = true; + +ciu_out: + /* After a CTRL reset we need to have CIU set clock registers */ + mci_send_cmd(host->slot, SDMMC_CMD_UPD_CLK, 0); + + return ret; +} + +static const struct mmc_host_ops dw_mci_ops = { + .request = dw_mci_request, + .pre_req = dw_mci_pre_req, + .post_req = dw_mci_post_req, + .set_ios = dw_mci_set_ios, + .get_ro = dw_mci_get_ro, + .get_cd = dw_mci_get_cd, + .card_hw_reset = dw_mci_hw_reset, + .enable_sdio_irq = dw_mci_enable_sdio_irq, + .ack_sdio_irq = dw_mci_ack_sdio_irq, + .execute_tuning = dw_mci_execute_tuning, + .card_busy = dw_mci_card_busy, + .start_signal_voltage_switch = dw_mci_switch_voltage, + .prepare_hs400_tuning = dw_mci_prepare_hs400_tuning, +}; + +#ifdef CONFIG_FAULT_INJECTION +static enum hrtimer_restart dw_mci_fault_timer(struct hrtimer *t) +{ + struct dw_mci *host = container_of(t, struct dw_mci, fault_timer); + unsigned long flags; + + spin_lock_irqsave(&host->irq_lock, flags); + + /* + * Only inject an error if we haven't already got an error or data over + * interrupt. + */ + if (!host->data_status) { + host->data_status = SDMMC_INT_DCRC; + set_bit(EVENT_DATA_ERROR, &host->pending_events); + tasklet_schedule(&host->tasklet); + } + + spin_unlock_irqrestore(&host->irq_lock, flags); + + return HRTIMER_NORESTART; +} + +static void dw_mci_start_fault_timer(struct dw_mci *host) +{ + struct mmc_data *data = host->data; + + if (!data || data->blocks <= 1) + return; + + if (!should_fail(&host->fail_data_crc, 1)) + return; + + /* + * Try to inject the error at random points during the data transfer. + */ + hrtimer_start(&host->fault_timer, + ms_to_ktime(get_random_u32_below(25)), + HRTIMER_MODE_REL); +} + +static void dw_mci_stop_fault_timer(struct dw_mci *host) +{ + hrtimer_cancel(&host->fault_timer); +} + +static void dw_mci_init_fault(struct dw_mci *host) +{ + host->fail_data_crc = (struct fault_attr) FAULT_ATTR_INITIALIZER; + + hrtimer_init(&host->fault_timer, CLOCK_MONOTONIC, HRTIMER_MODE_REL); + host->fault_timer.function = dw_mci_fault_timer; +} +#else +static void dw_mci_init_fault(struct dw_mci *host) +{ +} + +static void dw_mci_start_fault_timer(struct dw_mci *host) +{ +} + +static void dw_mci_stop_fault_timer(struct dw_mci *host) +{ +} +#endif + +static void dw_mci_request_end(struct dw_mci *host, struct mmc_request *mrq) + __releases(&host->lock) + __acquires(&host->lock) +{ + struct dw_mci_slot *slot; + struct mmc_host *prev_mmc = host->slot->mmc; + + WARN_ON(host->cmd || host->data); + + host->slot->mrq = NULL; + host->mrq = NULL; + if (!list_empty(&host->queue)) { + slot = list_entry(host->queue.next, + struct dw_mci_slot, queue_node); + list_del(&slot->queue_node); + dev_vdbg(host->dev, "list not empty: %s is next\n", + mmc_hostname(slot->mmc)); + host->state = STATE_SENDING_CMD; + dw_mci_start_request(host, slot); + } else { + dev_vdbg(host->dev, "list empty\n"); + + if (host->state == STATE_SENDING_CMD11) + host->state = STATE_WAITING_CMD11_DONE; + else + host->state = STATE_IDLE; + } + + spin_unlock(&host->lock); + mmc_request_done(prev_mmc, mrq); + spin_lock(&host->lock); +} + +static int dw_mci_command_complete(struct dw_mci *host, struct mmc_command *cmd) +{ + u32 status = host->cmd_status; + + host->cmd_status = 0; + + /* Read the response from the card (up to 16 bytes) */ + if (cmd->flags & MMC_RSP_PRESENT) { + if (cmd->flags & MMC_RSP_136) { + cmd->resp[3] = mci_readl(host, RESP0); + cmd->resp[2] = mci_readl(host, RESP1); + cmd->resp[1] = mci_readl(host, RESP2); + cmd->resp[0] = mci_readl(host, RESP3); + } else { + cmd->resp[0] = mci_readl(host, RESP0); + cmd->resp[1] = 0; + cmd->resp[2] = 0; + cmd->resp[3] = 0; + } + } + + if (status & SDMMC_INT_RTO) + cmd->error = -ETIMEDOUT; + else if ((cmd->flags & MMC_RSP_CRC) && (status & SDMMC_INT_RCRC)) + cmd->error = -EILSEQ; + else if (status & SDMMC_INT_RESP_ERR) + cmd->error = -EIO; + else + cmd->error = 0; + + return cmd->error; +} + +static int dw_mci_data_complete(struct dw_mci *host, struct mmc_data *data) +{ + u32 status = host->data_status; + + if (status & DW_MCI_DATA_ERROR_FLAGS) { + if (status & SDMMC_INT_DRTO) { + data->error = -ETIMEDOUT; + } else if (status & SDMMC_INT_DCRC) { + data->error = -EILSEQ; + } else if (status & SDMMC_INT_EBE) { + if (host->dir_status == + DW_MCI_SEND_STATUS) { + /* + * No data CRC status was returned. + * The number of bytes transferred + * will be exaggerated in PIO mode. + */ + data->bytes_xfered = 0; + data->error = -ETIMEDOUT; + } else if (host->dir_status == + DW_MCI_RECV_STATUS) { + data->error = -EILSEQ; + } + } else { + /* SDMMC_INT_SBE is included */ + data->error = -EILSEQ; + } + + dev_dbg(host->dev, "data error, status 0x%08x\n", status); + + /* + * After an error, there may be data lingering + * in the FIFO + */ + dw_mci_reset(host); + } else { + data->bytes_xfered = data->blocks * data->blksz; + data->error = 0; + } + + return data->error; +} + +static void dw_mci_set_drto(struct dw_mci *host) +{ + const struct dw_mci_drv_data *drv_data = host->drv_data; + unsigned int drto_clks; + unsigned int drto_div; + unsigned int drto_ms; + unsigned long irqflags; + + if (drv_data && drv_data->get_drto_clks) + drto_clks = drv_data->get_drto_clks(host); + else + drto_clks = mci_readl(host, TMOUT) >> 8; + drto_div = (mci_readl(host, CLKDIV) & 0xff) * 2; + if (drto_div == 0) + drto_div = 1; + + drto_ms = DIV_ROUND_UP_ULL((u64)MSEC_PER_SEC * drto_clks * drto_div, + host->bus_hz); + + dev_dbg(host->dev, "drto_ms: %u\n", drto_ms); + + /* add a bit spare time */ + drto_ms += 10; + + spin_lock_irqsave(&host->irq_lock, irqflags); + if (!test_bit(EVENT_DATA_COMPLETE, &host->pending_events)) + mod_timer(&host->dto_timer, + jiffies + msecs_to_jiffies(drto_ms)); + spin_unlock_irqrestore(&host->irq_lock, irqflags); +} + +static bool dw_mci_clear_pending_cmd_complete(struct dw_mci *host) +{ + if (!test_bit(EVENT_CMD_COMPLETE, &host->pending_events)) + return false; + + /* + * Really be certain that the timer has stopped. This is a bit of + * paranoia and could only really happen if we had really bad + * interrupt latency and the interrupt routine and timeout were + * running concurrently so that the del_timer() in the interrupt + * handler couldn't run. + */ + WARN_ON(del_timer_sync(&host->cto_timer)); + clear_bit(EVENT_CMD_COMPLETE, &host->pending_events); + + return true; +} + +static bool dw_mci_clear_pending_data_complete(struct dw_mci *host) +{ + if (!test_bit(EVENT_DATA_COMPLETE, &host->pending_events)) + return false; + + /* Extra paranoia just like dw_mci_clear_pending_cmd_complete() */ + WARN_ON(del_timer_sync(&host->dto_timer)); + clear_bit(EVENT_DATA_COMPLETE, &host->pending_events); + + return true; +} + +static void dw_mci_tasklet_func(struct tasklet_struct *t) +{ + struct dw_mci *host = from_tasklet(host, t, tasklet); + struct mmc_data *data; + struct mmc_command *cmd; + struct mmc_request *mrq; + enum dw_mci_state state; + enum dw_mci_state prev_state; + unsigned int err; + + spin_lock(&host->lock); + + state = host->state; + data = host->data; + mrq = host->mrq; + + do { + prev_state = state; + + switch (state) { + case STATE_IDLE: + case STATE_WAITING_CMD11_DONE: + break; + + case STATE_SENDING_CMD11: + case STATE_SENDING_CMD: + if (!dw_mci_clear_pending_cmd_complete(host)) + break; + + cmd = host->cmd; + host->cmd = NULL; + set_bit(EVENT_CMD_COMPLETE, &host->completed_events); + err = dw_mci_command_complete(host, cmd); + if (cmd == mrq->sbc && !err) { + __dw_mci_start_request(host, host->slot, + mrq->cmd); + goto unlock; + } + + if (cmd->data && err) { + /* + * During UHS tuning sequence, sending the stop + * command after the response CRC error would + * throw the system into a confused state + * causing all future tuning phases to report + * failure. + * + * In such case controller will move into a data + * transfer state after a response error or + * response CRC error. Let's let that finish + * before trying to send a stop, so we'll go to + * STATE_SENDING_DATA. + * + * Although letting the data transfer take place + * will waste a bit of time (we already know + * the command was bad), it can't cause any + * errors since it's possible it would have + * taken place anyway if this tasklet got + * delayed. Allowing the transfer to take place + * avoids races and keeps things simple. + */ + if (err != -ETIMEDOUT && + host->dir_status == DW_MCI_RECV_STATUS) { + state = STATE_SENDING_DATA; + continue; + } + + send_stop_abort(host, data); + dw_mci_stop_dma(host); + state = STATE_SENDING_STOP; + break; + } + + if (!cmd->data || err) { + dw_mci_request_end(host, mrq); + goto unlock; + } + + prev_state = state = STATE_SENDING_DATA; + fallthrough; + + case STATE_SENDING_DATA: + /* + * We could get a data error and never a transfer + * complete so we'd better check for it here. + * + * Note that we don't really care if we also got a + * transfer complete; stopping the DMA and sending an + * abort won't hurt. + */ + if (test_and_clear_bit(EVENT_DATA_ERROR, + &host->pending_events)) { + if (!(host->data_status & (SDMMC_INT_DRTO | + SDMMC_INT_EBE))) + send_stop_abort(host, data); + dw_mci_stop_dma(host); + state = STATE_DATA_ERROR; + break; + } + + if (!test_and_clear_bit(EVENT_XFER_COMPLETE, + &host->pending_events)) { + /* + * If all data-related interrupts don't come + * within the given time in reading data state. + */ + if (host->dir_status == DW_MCI_RECV_STATUS) + dw_mci_set_drto(host); + break; + } + + set_bit(EVENT_XFER_COMPLETE, &host->completed_events); + + /* + * Handle an EVENT_DATA_ERROR that might have shown up + * before the transfer completed. This might not have + * been caught by the check above because the interrupt + * could have gone off between the previous check and + * the check for transfer complete. + * + * Technically this ought not be needed assuming we + * get a DATA_COMPLETE eventually (we'll notice the + * error and end the request), but it shouldn't hurt. + * + * This has the advantage of sending the stop command. + */ + if (test_and_clear_bit(EVENT_DATA_ERROR, + &host->pending_events)) { + if (!(host->data_status & (SDMMC_INT_DRTO | + SDMMC_INT_EBE))) + send_stop_abort(host, data); + dw_mci_stop_dma(host); + state = STATE_DATA_ERROR; + break; + } + prev_state = state = STATE_DATA_BUSY; + + fallthrough; + + case STATE_DATA_BUSY: + if (!dw_mci_clear_pending_data_complete(host)) { + /* + * If data error interrupt comes but data over + * interrupt doesn't come within the given time. + * in reading data state. + */ + if (host->dir_status == DW_MCI_RECV_STATUS) + dw_mci_set_drto(host); + break; + } + + dw_mci_stop_fault_timer(host); + host->data = NULL; + set_bit(EVENT_DATA_COMPLETE, &host->completed_events); + err = dw_mci_data_complete(host, data); + + if (!err) { + if (!data->stop || mrq->sbc) { + if (mrq->sbc && data->stop) + data->stop->error = 0; + dw_mci_request_end(host, mrq); + goto unlock; + } + + /* stop command for open-ended transfer*/ + if (data->stop) + send_stop_abort(host, data); + } else { + /* + * If we don't have a command complete now we'll + * never get one since we just reset everything; + * better end the request. + * + * If we do have a command complete we'll fall + * through to the SENDING_STOP command and + * everything will be peachy keen. + */ + if (!test_bit(EVENT_CMD_COMPLETE, + &host->pending_events)) { + host->cmd = NULL; + dw_mci_request_end(host, mrq); + goto unlock; + } + } + + /* + * If err has non-zero, + * stop-abort command has been already issued. + */ + prev_state = state = STATE_SENDING_STOP; + + fallthrough; + + case STATE_SENDING_STOP: + if (!dw_mci_clear_pending_cmd_complete(host)) + break; + + /* CMD error in data command */ + if (mrq->cmd->error && mrq->data) + dw_mci_reset(host); + + dw_mci_stop_fault_timer(host); + host->cmd = NULL; + host->data = NULL; + + if (!mrq->sbc && mrq->stop) + dw_mci_command_complete(host, mrq->stop); + else + host->cmd_status = 0; + + dw_mci_request_end(host, mrq); + goto unlock; + + case STATE_DATA_ERROR: + if (!test_and_clear_bit(EVENT_XFER_COMPLETE, + &host->pending_events)) + break; + + state = STATE_DATA_BUSY; + break; + } + } while (state != prev_state); + + host->state = state; +unlock: + spin_unlock(&host->lock); + +} + +/* push final bytes to part_buf, only use during push */ +static void dw_mci_set_part_bytes(struct dw_mci *host, void *buf, int cnt) +{ + memcpy((void *)&host->part_buf, buf, cnt); + host->part_buf_count = cnt; +} + +/* append bytes to part_buf, only use during push */ +static int dw_mci_push_part_bytes(struct dw_mci *host, void *buf, int cnt) +{ + cnt = min(cnt, (1 << host->data_shift) - host->part_buf_count); + memcpy((void *)&host->part_buf + host->part_buf_count, buf, cnt); + host->part_buf_count += cnt; + return cnt; +} + +/* pull first bytes from part_buf, only use during pull */ +static int dw_mci_pull_part_bytes(struct dw_mci *host, void *buf, int cnt) +{ + cnt = min_t(int, cnt, host->part_buf_count); + if (cnt) { + memcpy(buf, (void *)&host->part_buf + host->part_buf_start, + cnt); + host->part_buf_count -= cnt; + host->part_buf_start += cnt; + } + return cnt; +} + +/* pull final bytes from the part_buf, assuming it's just been filled */ +static void dw_mci_pull_final_bytes(struct dw_mci *host, void *buf, int cnt) +{ + memcpy(buf, &host->part_buf, cnt); + host->part_buf_start = cnt; + host->part_buf_count = (1 << host->data_shift) - cnt; +} + +static void dw_mci_push_data16(struct dw_mci *host, void *buf, int cnt) +{ + struct mmc_data *data = host->data; + int init_cnt = cnt; + + /* try and push anything in the part_buf */ + if (unlikely(host->part_buf_count)) { + int len = dw_mci_push_part_bytes(host, buf, cnt); + + buf += len; + cnt -= len; + if (host->part_buf_count == 2) { + mci_fifo_writew(host->fifo_reg, host->part_buf16); + host->part_buf_count = 0; + } + } +#ifndef CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS + if (unlikely((unsigned long)buf & 0x1)) { + while (cnt >= 2) { + u16 aligned_buf[64]; + int len = min(cnt & -2, (int)sizeof(aligned_buf)); + int items = len >> 1; + int i; + /* memcpy from input buffer into aligned buffer */ + memcpy(aligned_buf, buf, len); + buf += len; + cnt -= len; + /* push data from aligned buffer into fifo */ + for (i = 0; i < items; ++i) + mci_fifo_writew(host->fifo_reg, aligned_buf[i]); + } + } else +#endif + { + u16 *pdata = buf; + + for (; cnt >= 2; cnt -= 2) + mci_fifo_writew(host->fifo_reg, *pdata++); + buf = pdata; + } + /* put anything remaining in the part_buf */ + if (cnt) { + dw_mci_set_part_bytes(host, buf, cnt); + /* Push data if we have reached the expected data length */ + if ((data->bytes_xfered + init_cnt) == + (data->blksz * data->blocks)) + mci_fifo_writew(host->fifo_reg, host->part_buf16); + } +} + +static void dw_mci_pull_data16(struct dw_mci *host, void *buf, int cnt) +{ +#ifndef CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS + if (unlikely((unsigned long)buf & 0x1)) { + while (cnt >= 2) { + /* pull data from fifo into aligned buffer */ + u16 aligned_buf[64]; + int len = min(cnt & -2, (int)sizeof(aligned_buf)); + int items = len >> 1; + int i; + + for (i = 0; i < items; ++i) + aligned_buf[i] = mci_fifo_readw(host->fifo_reg); + /* memcpy from aligned buffer into output buffer */ + memcpy(buf, aligned_buf, len); + buf += len; + cnt -= len; + } + } else +#endif + { + u16 *pdata = buf; + + for (; cnt >= 2; cnt -= 2) + *pdata++ = mci_fifo_readw(host->fifo_reg); + buf = pdata; + } + if (cnt) { + host->part_buf16 = mci_fifo_readw(host->fifo_reg); + dw_mci_pull_final_bytes(host, buf, cnt); + } +} + +static void dw_mci_push_data32(struct dw_mci *host, void *buf, int cnt) +{ + struct mmc_data *data = host->data; + int init_cnt = cnt; + + /* try and push anything in the part_buf */ + if (unlikely(host->part_buf_count)) { + int len = dw_mci_push_part_bytes(host, buf, cnt); + + buf += len; + cnt -= len; + if (host->part_buf_count == 4) { + mci_fifo_writel(host->fifo_reg, host->part_buf32); + host->part_buf_count = 0; + } + } +#ifndef CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS + if (unlikely((unsigned long)buf & 0x3)) { + while (cnt >= 4) { + u32 aligned_buf[32]; + int len = min(cnt & -4, (int)sizeof(aligned_buf)); + int items = len >> 2; + int i; + /* memcpy from input buffer into aligned buffer */ + memcpy(aligned_buf, buf, len); + buf += len; + cnt -= len; + /* push data from aligned buffer into fifo */ + for (i = 0; i < items; ++i) + mci_fifo_writel(host->fifo_reg, aligned_buf[i]); + } + } else +#endif + { + u32 *pdata = buf; + + for (; cnt >= 4; cnt -= 4) + mci_fifo_writel(host->fifo_reg, *pdata++); + buf = pdata; + } + /* put anything remaining in the part_buf */ + if (cnt) { + dw_mci_set_part_bytes(host, buf, cnt); + /* Push data if we have reached the expected data length */ + if ((data->bytes_xfered + init_cnt) == + (data->blksz * data->blocks)) + mci_fifo_writel(host->fifo_reg, host->part_buf32); + } +} + +static void dw_mci_pull_data32(struct dw_mci *host, void *buf, int cnt) +{ +#ifndef CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS + if (unlikely((unsigned long)buf & 0x3)) { + while (cnt >= 4) { + /* pull data from fifo into aligned buffer */ + u32 aligned_buf[32]; + int len = min(cnt & -4, (int)sizeof(aligned_buf)); + int items = len >> 2; + int i; + + for (i = 0; i < items; ++i) + aligned_buf[i] = mci_fifo_readl(host->fifo_reg); + /* memcpy from aligned buffer into output buffer */ + memcpy(buf, aligned_buf, len); + buf += len; + cnt -= len; + } + } else +#endif + { + u32 *pdata = buf; + + for (; cnt >= 4; cnt -= 4) + *pdata++ = mci_fifo_readl(host->fifo_reg); + buf = pdata; + } + if (cnt) { + host->part_buf32 = mci_fifo_readl(host->fifo_reg); + dw_mci_pull_final_bytes(host, buf, cnt); + } +} + +static void dw_mci_push_data64(struct dw_mci *host, void *buf, int cnt) +{ + struct mmc_data *data = host->data; + int init_cnt = cnt; + + /* try and push anything in the part_buf */ + if (unlikely(host->part_buf_count)) { + int len = dw_mci_push_part_bytes(host, buf, cnt); + + buf += len; + cnt -= len; + + if (host->part_buf_count == 8) { + mci_fifo_writeq(host->fifo_reg, host->part_buf); + host->part_buf_count = 0; + } + } +#ifndef CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS + if (unlikely((unsigned long)buf & 0x7)) { + while (cnt >= 8) { + u64 aligned_buf[16]; + int len = min(cnt & -8, (int)sizeof(aligned_buf)); + int items = len >> 3; + int i; + /* memcpy from input buffer into aligned buffer */ + memcpy(aligned_buf, buf, len); + buf += len; + cnt -= len; + /* push data from aligned buffer into fifo */ + for (i = 0; i < items; ++i) + mci_fifo_writeq(host->fifo_reg, aligned_buf[i]); + } + } else +#endif + { + u64 *pdata = buf; + + for (; cnt >= 8; cnt -= 8) + mci_fifo_writeq(host->fifo_reg, *pdata++); + buf = pdata; + } + /* put anything remaining in the part_buf */ + if (cnt) { + dw_mci_set_part_bytes(host, buf, cnt); + /* Push data if we have reached the expected data length */ + if ((data->bytes_xfered + init_cnt) == + (data->blksz * data->blocks)) + mci_fifo_writeq(host->fifo_reg, host->part_buf); + } +} + +static void dw_mci_pull_data64(struct dw_mci *host, void *buf, int cnt) +{ +#ifndef CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS + if (unlikely((unsigned long)buf & 0x7)) { + while (cnt >= 8) { + /* pull data from fifo into aligned buffer */ + u64 aligned_buf[16]; + int len = min(cnt & -8, (int)sizeof(aligned_buf)); + int items = len >> 3; + int i; + + for (i = 0; i < items; ++i) + aligned_buf[i] = mci_fifo_readq(host->fifo_reg); + + /* memcpy from aligned buffer into output buffer */ + memcpy(buf, aligned_buf, len); + buf += len; + cnt -= len; + } + } else +#endif + { + u64 *pdata = buf; + + for (; cnt >= 8; cnt -= 8) + *pdata++ = mci_fifo_readq(host->fifo_reg); + buf = pdata; + } + if (cnt) { + host->part_buf = mci_fifo_readq(host->fifo_reg); + dw_mci_pull_final_bytes(host, buf, cnt); + } +} + +static void dw_mci_pull_data(struct dw_mci *host, void *buf, int cnt) +{ + int len; + + /* get remaining partial bytes */ + len = dw_mci_pull_part_bytes(host, buf, cnt); + if (unlikely(len == cnt)) + return; + buf += len; + cnt -= len; + + /* get the rest of the data */ + host->pull_data(host, buf, cnt); +} + +static void dw_mci_read_data_pio(struct dw_mci *host, bool dto) +{ + struct sg_mapping_iter *sg_miter = &host->sg_miter; + void *buf; + unsigned int offset; + struct mmc_data *data = host->data; + int shift = host->data_shift; + u32 status; + unsigned int len; + unsigned int remain, fcnt; + + do { + if (!sg_miter_next(sg_miter)) + goto done; + + host->sg = sg_miter->piter.sg; + buf = sg_miter->addr; + remain = sg_miter->length; + offset = 0; + + do { + fcnt = (SDMMC_GET_FCNT(mci_readl(host, STATUS)) + << shift) + host->part_buf_count; + len = min(remain, fcnt); + if (!len) + break; + dw_mci_pull_data(host, (void *)(buf + offset), len); + data->bytes_xfered += len; + offset += len; + remain -= len; + } while (remain); + + sg_miter->consumed = offset; + status = mci_readl(host, MINTSTS); + mci_writel(host, RINTSTS, SDMMC_INT_RXDR); + /* if the RXDR is ready read again */ + } while ((status & SDMMC_INT_RXDR) || + (dto && SDMMC_GET_FCNT(mci_readl(host, STATUS)))); + + if (!remain) { + if (!sg_miter_next(sg_miter)) + goto done; + sg_miter->consumed = 0; + } + sg_miter_stop(sg_miter); + return; + +done: + sg_miter_stop(sg_miter); + host->sg = NULL; + smp_wmb(); /* drain writebuffer */ + set_bit(EVENT_XFER_COMPLETE, &host->pending_events); +} + +static void dw_mci_write_data_pio(struct dw_mci *host) +{ + struct sg_mapping_iter *sg_miter = &host->sg_miter; + void *buf; + unsigned int offset; + struct mmc_data *data = host->data; + int shift = host->data_shift; + u32 status; + unsigned int len; + unsigned int fifo_depth = host->fifo_depth; + unsigned int remain, fcnt; + + do { + if (!sg_miter_next(sg_miter)) + goto done; + + host->sg = sg_miter->piter.sg; + buf = sg_miter->addr; + remain = sg_miter->length; + offset = 0; + + do { + fcnt = ((fifo_depth - + SDMMC_GET_FCNT(mci_readl(host, STATUS))) + << shift) - host->part_buf_count; + len = min(remain, fcnt); + if (!len) + break; + host->push_data(host, (void *)(buf + offset), len); + data->bytes_xfered += len; + offset += len; + remain -= len; + } while (remain); + + sg_miter->consumed = offset; + status = mci_readl(host, MINTSTS); + mci_writel(host, RINTSTS, SDMMC_INT_TXDR); + } while (status & SDMMC_INT_TXDR); /* if TXDR write again */ + + if (!remain) { + if (!sg_miter_next(sg_miter)) + goto done; + sg_miter->consumed = 0; + } + sg_miter_stop(sg_miter); + return; + +done: + sg_miter_stop(sg_miter); + host->sg = NULL; + smp_wmb(); /* drain writebuffer */ + set_bit(EVENT_XFER_COMPLETE, &host->pending_events); +} + +static void dw_mci_cmd_interrupt(struct dw_mci *host, u32 status) +{ + del_timer(&host->cto_timer); + + if (!host->cmd_status) + host->cmd_status = status; + + smp_wmb(); /* drain writebuffer */ + + set_bit(EVENT_CMD_COMPLETE, &host->pending_events); + tasklet_schedule(&host->tasklet); + + dw_mci_start_fault_timer(host); +} + +static void dw_mci_handle_cd(struct dw_mci *host) +{ + struct dw_mci_slot *slot = host->slot; + + mmc_detect_change(slot->mmc, + msecs_to_jiffies(host->pdata->detect_delay_ms)); +} + +static irqreturn_t dw_mci_interrupt(int irq, void *dev_id) +{ + struct dw_mci *host = dev_id; + u32 pending; + struct dw_mci_slot *slot = host->slot; + + pending = mci_readl(host, MINTSTS); /* read-only mask reg */ + + if (pending) { + /* Check volt switch first, since it can look like an error */ + if ((host->state == STATE_SENDING_CMD11) && + (pending & SDMMC_INT_VOLT_SWITCH)) { + mci_writel(host, RINTSTS, SDMMC_INT_VOLT_SWITCH); + pending &= ~SDMMC_INT_VOLT_SWITCH; + + /* + * Hold the lock; we know cmd11_timer can't be kicked + * off after the lock is released, so safe to delete. + */ + spin_lock(&host->irq_lock); + dw_mci_cmd_interrupt(host, pending); + spin_unlock(&host->irq_lock); + + del_timer(&host->cmd11_timer); + } + + if (pending & DW_MCI_CMD_ERROR_FLAGS) { + spin_lock(&host->irq_lock); + + del_timer(&host->cto_timer); + mci_writel(host, RINTSTS, DW_MCI_CMD_ERROR_FLAGS); + host->cmd_status = pending; + smp_wmb(); /* drain writebuffer */ + set_bit(EVENT_CMD_COMPLETE, &host->pending_events); + + spin_unlock(&host->irq_lock); + } + + if (pending & DW_MCI_DATA_ERROR_FLAGS) { + spin_lock(&host->irq_lock); + + if (host->quirks & DW_MMC_QUIRK_EXTENDED_TMOUT) + del_timer(&host->dto_timer); + + /* if there is an error report DATA_ERROR */ + mci_writel(host, RINTSTS, DW_MCI_DATA_ERROR_FLAGS); + host->data_status = pending; + smp_wmb(); /* drain writebuffer */ + set_bit(EVENT_DATA_ERROR, &host->pending_events); + + if (host->quirks & DW_MMC_QUIRK_EXTENDED_TMOUT) + /* In case of error, we cannot expect a DTO */ + set_bit(EVENT_DATA_COMPLETE, + &host->pending_events); + + tasklet_schedule(&host->tasklet); + + spin_unlock(&host->irq_lock); + } + + if (pending & SDMMC_INT_DATA_OVER) { + spin_lock(&host->irq_lock); + + del_timer(&host->dto_timer); + + mci_writel(host, RINTSTS, SDMMC_INT_DATA_OVER); + if (!host->data_status) + host->data_status = pending; + smp_wmb(); /* drain writebuffer */ + if (host->dir_status == DW_MCI_RECV_STATUS) { + if (host->sg != NULL) + dw_mci_read_data_pio(host, true); + } + set_bit(EVENT_DATA_COMPLETE, &host->pending_events); + tasklet_schedule(&host->tasklet); + + spin_unlock(&host->irq_lock); + } + + if (pending & SDMMC_INT_RXDR) { + mci_writel(host, RINTSTS, SDMMC_INT_RXDR); + if (host->dir_status == DW_MCI_RECV_STATUS && host->sg) + dw_mci_read_data_pio(host, false); + } + + if (pending & SDMMC_INT_TXDR) { + mci_writel(host, RINTSTS, SDMMC_INT_TXDR); + if (host->dir_status == DW_MCI_SEND_STATUS && host->sg) + dw_mci_write_data_pio(host); + } + + if (pending & SDMMC_INT_CMD_DONE) { + spin_lock(&host->irq_lock); + + mci_writel(host, RINTSTS, SDMMC_INT_CMD_DONE); + dw_mci_cmd_interrupt(host, pending); + + spin_unlock(&host->irq_lock); + } + + if (pending & SDMMC_INT_CD) { + mci_writel(host, RINTSTS, SDMMC_INT_CD); + dw_mci_handle_cd(host); + } + + if (pending & SDMMC_INT_SDIO(slot->sdio_id)) { + mci_writel(host, RINTSTS, + SDMMC_INT_SDIO(slot->sdio_id)); + __dw_mci_enable_sdio_irq(slot, 0); + sdio_signal_irq(slot->mmc); + } + + } + + if (host->use_dma != TRANS_MODE_IDMAC) + return IRQ_HANDLED; + + /* Handle IDMA interrupts */ + if (host->dma_64bit_address == 1) { + pending = mci_readl(host, IDSTS64); + if (pending & (SDMMC_IDMAC_INT_TI | SDMMC_IDMAC_INT_RI)) { + mci_writel(host, IDSTS64, SDMMC_IDMAC_INT_TI | + SDMMC_IDMAC_INT_RI); + mci_writel(host, IDSTS64, SDMMC_IDMAC_INT_NI); + if (!test_bit(EVENT_DATA_ERROR, &host->pending_events)) + host->dma_ops->complete((void *)host); + } + } else { + pending = mci_readl(host, IDSTS); + if (pending & (SDMMC_IDMAC_INT_TI | SDMMC_IDMAC_INT_RI)) { + mci_writel(host, IDSTS, SDMMC_IDMAC_INT_TI | + SDMMC_IDMAC_INT_RI); + mci_writel(host, IDSTS, SDMMC_IDMAC_INT_NI); + if (!test_bit(EVENT_DATA_ERROR, &host->pending_events)) + host->dma_ops->complete((void *)host); + } + } + + return IRQ_HANDLED; +} + +static int dw_mci_init_slot_caps(struct dw_mci_slot *slot) +{ + struct dw_mci *host = slot->host; + const struct dw_mci_drv_data *drv_data = host->drv_data; + struct mmc_host *mmc = slot->mmc; + int ctrl_id; + + if (host->pdata->caps) + mmc->caps = host->pdata->caps; + + if (host->pdata->pm_caps) + mmc->pm_caps = host->pdata->pm_caps; + + if (drv_data) + mmc->caps |= drv_data->common_caps; + + if (host->dev->of_node) { + ctrl_id = of_alias_get_id(host->dev->of_node, "mshc"); + if (ctrl_id < 0) + ctrl_id = 0; + } else { + ctrl_id = to_platform_device(host->dev)->id; + } + + if (drv_data && drv_data->caps) { + if (ctrl_id >= drv_data->num_caps) { + dev_err(host->dev, "invalid controller id %d\n", + ctrl_id); + return -EINVAL; + } + mmc->caps |= drv_data->caps[ctrl_id]; + } + + if (host->pdata->caps2) + mmc->caps2 = host->pdata->caps2; + + /* if host has set a minimum_freq, we should respect it */ + if (host->minimum_speed) + mmc->f_min = host->minimum_speed; + else + mmc->f_min = DW_MCI_FREQ_MIN; + + if (!mmc->f_max) + mmc->f_max = DW_MCI_FREQ_MAX; + + /* Process SDIO IRQs through the sdio_irq_work. */ + if (mmc->caps & MMC_CAP_SDIO_IRQ) + mmc->caps2 |= MMC_CAP2_SDIO_IRQ_NOTHREAD; + + return 0; +} + +static int dw_mci_init_slot(struct dw_mci *host) +{ + struct mmc_host *mmc; + struct dw_mci_slot *slot; + int ret; + + mmc = mmc_alloc_host(sizeof(struct dw_mci_slot), host->dev); + if (!mmc) + return -ENOMEM; + + slot = mmc_priv(mmc); + slot->id = 0; + slot->sdio_id = host->sdio_id0 + slot->id; + slot->mmc = mmc; + slot->host = host; + host->slot = slot; + + mmc->ops = &dw_mci_ops; + + /*if there are external regulators, get them*/ + ret = mmc_regulator_get_supply(mmc); + if (ret) + goto err_host_allocated; + + if (!mmc->ocr_avail) + mmc->ocr_avail = MMC_VDD_32_33 | MMC_VDD_33_34; + + ret = mmc_of_parse(mmc); + if (ret) + goto err_host_allocated; + + ret = dw_mci_init_slot_caps(slot); + if (ret) + goto err_host_allocated; + + /* Useful defaults if platform data is unset. */ + if (host->use_dma == TRANS_MODE_IDMAC) { + mmc->max_segs = host->ring_size; + mmc->max_blk_size = 65535; + mmc->max_seg_size = 0x1000; + mmc->max_req_size = mmc->max_seg_size * host->ring_size; + mmc->max_blk_count = mmc->max_req_size / 512; + } else if (host->use_dma == TRANS_MODE_EDMAC) { + mmc->max_segs = 64; + mmc->max_blk_size = 65535; + mmc->max_blk_count = 65535; + mmc->max_req_size = + mmc->max_blk_size * mmc->max_blk_count; + mmc->max_seg_size = mmc->max_req_size; + } else { + /* TRANS_MODE_PIO */ + mmc->max_segs = 64; + mmc->max_blk_size = 65535; /* BLKSIZ is 16 bits */ + mmc->max_blk_count = 512; + mmc->max_req_size = mmc->max_blk_size * + mmc->max_blk_count; + mmc->max_seg_size = mmc->max_req_size; + } + + dw_mci_get_cd(mmc); + + ret = mmc_add_host(mmc); + if (ret) + goto err_host_allocated; + +#if defined(CONFIG_DEBUG_FS) + dw_mci_init_debugfs(slot); +#endif + + return 0; + +err_host_allocated: + mmc_free_host(mmc); + return ret; +} + +static void dw_mci_cleanup_slot(struct dw_mci_slot *slot) +{ + /* Debugfs stuff is cleaned up by mmc core */ + mmc_remove_host(slot->mmc); + slot->host->slot = NULL; + mmc_free_host(slot->mmc); +} + +static void dw_mci_init_dma(struct dw_mci *host) +{ + int addr_config; + struct device *dev = host->dev; + + /* + * Check tansfer mode from HCON[17:16] + * Clear the ambiguous description of dw_mmc databook: + * 2b'00: No DMA Interface -> Actually means using Internal DMA block + * 2b'01: DesignWare DMA Interface -> Synopsys DW-DMA block + * 2b'10: Generic DMA Interface -> non-Synopsys generic DMA block + * 2b'11: Non DW DMA Interface -> pio only + * Compared to DesignWare DMA Interface, Generic DMA Interface has a + * simpler request/acknowledge handshake mechanism and both of them + * are regarded as external dma master for dw_mmc. + */ + host->use_dma = SDMMC_GET_TRANS_MODE(mci_readl(host, HCON)); + if (host->use_dma == DMA_INTERFACE_IDMA) { + host->use_dma = TRANS_MODE_IDMAC; + } else if (host->use_dma == DMA_INTERFACE_DWDMA || + host->use_dma == DMA_INTERFACE_GDMA) { + host->use_dma = TRANS_MODE_EDMAC; + } else { + goto no_dma; + } + + /* Determine which DMA interface to use */ + if (host->use_dma == TRANS_MODE_IDMAC) { + /* + * Check ADDR_CONFIG bit in HCON to find + * IDMAC address bus width + */ + addr_config = SDMMC_GET_ADDR_CONFIG(mci_readl(host, HCON)); + + if (addr_config == 1) { + /* host supports IDMAC in 64-bit address mode */ + host->dma_64bit_address = 1; + dev_info(host->dev, + "IDMAC supports 64-bit address mode.\n"); + if (!dma_set_mask(host->dev, DMA_BIT_MASK(64))) + dma_set_coherent_mask(host->dev, + DMA_BIT_MASK(64)); + } else { + /* host supports IDMAC in 32-bit address mode */ + host->dma_64bit_address = 0; + dev_info(host->dev, + "IDMAC supports 32-bit address mode.\n"); + } + + /* Alloc memory for sg translation */ + host->sg_cpu = dmam_alloc_coherent(host->dev, + DESC_RING_BUF_SZ, + &host->sg_dma, GFP_KERNEL); + if (!host->sg_cpu) { + dev_err(host->dev, + "%s: could not alloc DMA memory\n", + __func__); + goto no_dma; + } + + host->dma_ops = &dw_mci_idmac_ops; + dev_info(host->dev, "Using internal DMA controller.\n"); + } else { + /* TRANS_MODE_EDMAC: check dma bindings again */ + if ((device_property_string_array_count(dev, "dma-names") < 0) || + !device_property_present(dev, "dmas")) { + goto no_dma; + } + host->dma_ops = &dw_mci_edmac_ops; + dev_info(host->dev, "Using external DMA controller.\n"); + } + + if (host->dma_ops->init && host->dma_ops->start && + host->dma_ops->stop && host->dma_ops->cleanup) { + if (host->dma_ops->init(host)) { + dev_err(host->dev, "%s: Unable to initialize DMA Controller.\n", + __func__); + goto no_dma; + } + } else { + dev_err(host->dev, "DMA initialization not found.\n"); + goto no_dma; + } + + return; + +no_dma: + dev_info(host->dev, "Using PIO mode.\n"); + host->use_dma = TRANS_MODE_PIO; +} + +static void dw_mci_cmd11_timer(struct timer_list *t) +{ + struct dw_mci *host = from_timer(host, t, cmd11_timer); + + if (host->state != STATE_SENDING_CMD11) { + dev_warn(host->dev, "Unexpected CMD11 timeout\n"); + return; + } + + host->cmd_status = SDMMC_INT_RTO; + set_bit(EVENT_CMD_COMPLETE, &host->pending_events); + tasklet_schedule(&host->tasklet); +} + +static void dw_mci_cto_timer(struct timer_list *t) +{ + struct dw_mci *host = from_timer(host, t, cto_timer); + unsigned long irqflags; + u32 pending; + + spin_lock_irqsave(&host->irq_lock, irqflags); + + /* + * If somehow we have very bad interrupt latency it's remotely possible + * that the timer could fire while the interrupt is still pending or + * while the interrupt is midway through running. Let's be paranoid + * and detect those two cases. Note that this is paranoia is somewhat + * justified because in this function we don't actually cancel the + * pending command in the controller--we just assume it will never come. + */ + pending = mci_readl(host, MINTSTS); /* read-only mask reg */ + if (pending & (DW_MCI_CMD_ERROR_FLAGS | SDMMC_INT_CMD_DONE)) { + /* The interrupt should fire; no need to act but we can warn */ + dev_warn(host->dev, "Unexpected interrupt latency\n"); + goto exit; + } + if (test_bit(EVENT_CMD_COMPLETE, &host->pending_events)) { + /* Presumably interrupt handler couldn't delete the timer */ + dev_warn(host->dev, "CTO timeout when already completed\n"); + goto exit; + } + + /* + * Continued paranoia to make sure we're in the state we expect. + * This paranoia isn't really justified but it seems good to be safe. + */ + switch (host->state) { + case STATE_SENDING_CMD11: + case STATE_SENDING_CMD: + case STATE_SENDING_STOP: + /* + * If CMD_DONE interrupt does NOT come in sending command + * state, we should notify the driver to terminate current + * transfer and report a command timeout to the core. + */ + host->cmd_status = SDMMC_INT_RTO; + set_bit(EVENT_CMD_COMPLETE, &host->pending_events); + tasklet_schedule(&host->tasklet); + break; + default: + dev_warn(host->dev, "Unexpected command timeout, state %d\n", + host->state); + break; + } + +exit: + spin_unlock_irqrestore(&host->irq_lock, irqflags); +} + +static void dw_mci_dto_timer(struct timer_list *t) +{ + struct dw_mci *host = from_timer(host, t, dto_timer); + unsigned long irqflags; + u32 pending; + + spin_lock_irqsave(&host->irq_lock, irqflags); + + /* + * The DTO timer is much longer than the CTO timer, so it's even less + * likely that we'll these cases, but it pays to be paranoid. + */ + pending = mci_readl(host, MINTSTS); /* read-only mask reg */ + if (pending & SDMMC_INT_DATA_OVER) { + /* The interrupt should fire; no need to act but we can warn */ + dev_warn(host->dev, "Unexpected data interrupt latency\n"); + goto exit; + } + if (test_bit(EVENT_DATA_COMPLETE, &host->pending_events)) { + /* Presumably interrupt handler couldn't delete the timer */ + dev_warn(host->dev, "DTO timeout when already completed\n"); + goto exit; + } + + /* + * Continued paranoia to make sure we're in the state we expect. + * This paranoia isn't really justified but it seems good to be safe. + */ + switch (host->state) { + case STATE_SENDING_DATA: + case STATE_DATA_BUSY: + /* + * If DTO interrupt does NOT come in sending data state, + * we should notify the driver to terminate current transfer + * and report a data timeout to the core. + */ + host->data_status = SDMMC_INT_DRTO; + set_bit(EVENT_DATA_ERROR, &host->pending_events); + set_bit(EVENT_DATA_COMPLETE, &host->pending_events); + tasklet_schedule(&host->tasklet); + break; + default: + dev_warn(host->dev, "Unexpected data timeout, state %d\n", + host->state); + break; + } + +exit: + spin_unlock_irqrestore(&host->irq_lock, irqflags); +} + +#ifdef CONFIG_OF +static struct dw_mci_board *dw_mci_parse_dt(struct dw_mci *host) +{ + struct dw_mci_board *pdata; + struct device *dev = host->dev; + const struct dw_mci_drv_data *drv_data = host->drv_data; + int ret; + u32 clock_frequency; + + pdata = devm_kzalloc(dev, sizeof(*pdata), GFP_KERNEL); + if (!pdata) + return ERR_PTR(-ENOMEM); + + /* find reset controller when exist */ + pdata->rstc = devm_reset_control_get_optional_exclusive(dev, "reset"); + if (IS_ERR(pdata->rstc)) + return ERR_CAST(pdata->rstc); + + if (device_property_read_u32(dev, "fifo-depth", &pdata->fifo_depth)) + dev_info(dev, + "fifo-depth property not found, using value of FIFOTH register as default\n"); + + device_property_read_u32(dev, "card-detect-delay", + &pdata->detect_delay_ms); + + device_property_read_u32(dev, "data-addr", &host->data_addr_override); + + if (device_property_present(dev, "fifo-watermark-aligned")) + host->wm_aligned = true; + + if (!device_property_read_u32(dev, "clock-frequency", &clock_frequency)) + pdata->bus_hz = clock_frequency; + + if (drv_data && drv_data->parse_dt) { + ret = drv_data->parse_dt(host); + if (ret) + return ERR_PTR(ret); + } + + return pdata; +} + +#else /* CONFIG_OF */ +static struct dw_mci_board *dw_mci_parse_dt(struct dw_mci *host) +{ + return ERR_PTR(-EINVAL); +} +#endif /* CONFIG_OF */ + +static void dw_mci_enable_cd(struct dw_mci *host) +{ + unsigned long irqflags; + u32 temp; + + /* + * No need for CD if all slots have a non-error GPIO + * as well as broken card detection is found. + */ + if (host->slot->mmc->caps & MMC_CAP_NEEDS_POLL) + return; + + if (mmc_gpio_get_cd(host->slot->mmc) < 0) { + spin_lock_irqsave(&host->irq_lock, irqflags); + temp = mci_readl(host, INTMASK); + temp |= SDMMC_INT_CD; + mci_writel(host, INTMASK, temp); + spin_unlock_irqrestore(&host->irq_lock, irqflags); + } +} + +int dw_mci_probe(struct dw_mci *host) +{ + const struct dw_mci_drv_data *drv_data = host->drv_data; + int width, i, ret = 0; + u32 fifo_size; + + if (!host->pdata) { + host->pdata = dw_mci_parse_dt(host); + if (IS_ERR(host->pdata)) + return dev_err_probe(host->dev, PTR_ERR(host->pdata), + "platform data not available\n"); + } + + host->biu_clk = devm_clk_get(host->dev, "biu"); + if (IS_ERR(host->biu_clk)) { + dev_dbg(host->dev, "biu clock not available\n"); + } else { + ret = clk_prepare_enable(host->biu_clk); + if (ret) { + dev_err(host->dev, "failed to enable biu clock\n"); + return ret; + } + } + + host->ciu_clk = devm_clk_get(host->dev, "ciu"); + if (IS_ERR(host->ciu_clk)) { + dev_dbg(host->dev, "ciu clock not available\n"); + host->bus_hz = host->pdata->bus_hz; + } else { + ret = clk_prepare_enable(host->ciu_clk); + if (ret) { + dev_err(host->dev, "failed to enable ciu clock\n"); + goto err_clk_biu; + } + + if (host->pdata->bus_hz) { + ret = clk_set_rate(host->ciu_clk, host->pdata->bus_hz); + if (ret) + dev_warn(host->dev, + "Unable to set bus rate to %uHz\n", + host->pdata->bus_hz); + } + host->bus_hz = clk_get_rate(host->ciu_clk); + } + + if (!host->bus_hz) { + dev_err(host->dev, + "Platform data must supply bus speed\n"); + ret = -ENODEV; + goto err_clk_ciu; + } + + if (host->pdata->rstc) { + reset_control_assert(host->pdata->rstc); + usleep_range(10, 50); + reset_control_deassert(host->pdata->rstc); + } + + if (drv_data && drv_data->init) { + ret = drv_data->init(host); + if (ret) { + dev_err(host->dev, + "implementation specific init failed\n"); + goto err_clk_ciu; + } + } + + timer_setup(&host->cmd11_timer, dw_mci_cmd11_timer, 0); + timer_setup(&host->cto_timer, dw_mci_cto_timer, 0); + timer_setup(&host->dto_timer, dw_mci_dto_timer, 0); + + spin_lock_init(&host->lock); + spin_lock_init(&host->irq_lock); + INIT_LIST_HEAD(&host->queue); + + dw_mci_init_fault(host); + + /* + * Get the host data width - this assumes that HCON has been set with + * the correct values. + */ + i = SDMMC_GET_HDATA_WIDTH(mci_readl(host, HCON)); + if (!i) { + host->push_data = dw_mci_push_data16; + host->pull_data = dw_mci_pull_data16; + width = 16; + host->data_shift = 1; + } else if (i == 2) { + host->push_data = dw_mci_push_data64; + host->pull_data = dw_mci_pull_data64; + width = 64; + host->data_shift = 3; + } else { + /* Check for a reserved value, and warn if it is */ + WARN((i != 1), + "HCON reports a reserved host data width!\n" + "Defaulting to 32-bit access.\n"); + host->push_data = dw_mci_push_data32; + host->pull_data = dw_mci_pull_data32; + width = 32; + host->data_shift = 2; + } + + /* Reset all blocks */ + if (!dw_mci_ctrl_reset(host, SDMMC_CTRL_ALL_RESET_FLAGS)) { + ret = -ENODEV; + goto err_clk_ciu; + } + + host->dma_ops = host->pdata->dma_ops; + dw_mci_init_dma(host); + + /* Clear the interrupts for the host controller */ + mci_writel(host, RINTSTS, 0xFFFFFFFF); + mci_writel(host, INTMASK, 0); /* disable all mmc interrupt first */ + + /* Put in max timeout */ + mci_writel(host, TMOUT, 0xFFFFFFFF); + + /* + * FIFO threshold settings RxMark = fifo_size / 2 - 1, + * Tx Mark = fifo_size / 2 DMA Size = 8 + */ + if (!host->pdata->fifo_depth) { + /* + * Power-on value of RX_WMark is FIFO_DEPTH-1, but this may + * have been overwritten by the bootloader, just like we're + * about to do, so if you know the value for your hardware, you + * should put it in the platform data. + */ + fifo_size = mci_readl(host, FIFOTH); + fifo_size = 1 + ((fifo_size >> 16) & 0xfff); + } else { + fifo_size = host->pdata->fifo_depth; + } + host->fifo_depth = fifo_size; + host->fifoth_val = + SDMMC_SET_FIFOTH(0x2, fifo_size / 2 - 1, fifo_size / 2); + mci_writel(host, FIFOTH, host->fifoth_val); + + /* disable clock to CIU */ + mci_writel(host, CLKENA, 0); + mci_writel(host, CLKSRC, 0); + + /* + * In 2.40a spec, Data offset is changed. + * Need to check the version-id and set data-offset for DATA register. + */ + host->verid = SDMMC_GET_VERID(mci_readl(host, VERID)); + dev_info(host->dev, "Version ID is %04x\n", host->verid); + + if (host->data_addr_override) + host->fifo_reg = host->regs + host->data_addr_override; + else if (host->verid < DW_MMC_240A) + host->fifo_reg = host->regs + DATA_OFFSET; + else + host->fifo_reg = host->regs + DATA_240A_OFFSET; + + tasklet_setup(&host->tasklet, dw_mci_tasklet_func); + ret = devm_request_irq(host->dev, host->irq, dw_mci_interrupt, + host->irq_flags, "dw-mci", host); + if (ret) + goto err_dmaunmap; + + /* + * Enable interrupts for command done, data over, data empty, + * receive ready and error such as transmit, receive timeout, crc error + */ + mci_writel(host, INTMASK, SDMMC_INT_CMD_DONE | SDMMC_INT_DATA_OVER | + SDMMC_INT_TXDR | SDMMC_INT_RXDR | + DW_MCI_ERROR_FLAGS); + /* Enable mci interrupt */ + mci_writel(host, CTRL, SDMMC_CTRL_INT_ENABLE); + + dev_info(host->dev, + "DW MMC controller at irq %d,%d bit host data width,%u deep fifo\n", + host->irq, width, fifo_size); + + /* We need at least one slot to succeed */ + ret = dw_mci_init_slot(host); + if (ret) { + dev_dbg(host->dev, "slot %d init failed\n", i); + goto err_dmaunmap; + } + + /* Now that slots are all setup, we can enable card detect */ + dw_mci_enable_cd(host); + + return 0; + +err_dmaunmap: + if (host->use_dma && host->dma_ops->exit) + host->dma_ops->exit(host); + + reset_control_assert(host->pdata->rstc); + +err_clk_ciu: + clk_disable_unprepare(host->ciu_clk); + +err_clk_biu: + clk_disable_unprepare(host->biu_clk); + + return ret; +} +EXPORT_SYMBOL(dw_mci_probe); + +void dw_mci_remove(struct dw_mci *host) +{ + dev_dbg(host->dev, "remove slot\n"); + if (host->slot) + dw_mci_cleanup_slot(host->slot); + + mci_writel(host, RINTSTS, 0xFFFFFFFF); + mci_writel(host, INTMASK, 0); /* disable all mmc interrupt first */ + + /* disable clock to CIU */ + mci_writel(host, CLKENA, 0); + mci_writel(host, CLKSRC, 0); + + if (host->use_dma && host->dma_ops->exit) + host->dma_ops->exit(host); + + reset_control_assert(host->pdata->rstc); + + clk_disable_unprepare(host->ciu_clk); + clk_disable_unprepare(host->biu_clk); +} +EXPORT_SYMBOL(dw_mci_remove); + + + +#ifdef CONFIG_PM +int dw_mci_runtime_suspend(struct device *dev) +{ + struct dw_mci *host = dev_get_drvdata(dev); + + if (host->use_dma && host->dma_ops->exit) + host->dma_ops->exit(host); + + clk_disable_unprepare(host->ciu_clk); + + if (host->slot && + (mmc_can_gpio_cd(host->slot->mmc) || + !mmc_card_is_removable(host->slot->mmc))) + clk_disable_unprepare(host->biu_clk); + + return 0; +} +EXPORT_SYMBOL(dw_mci_runtime_suspend); + +int dw_mci_runtime_resume(struct device *dev) +{ + int ret = 0; + struct dw_mci *host = dev_get_drvdata(dev); + + if (host->slot && + (mmc_can_gpio_cd(host->slot->mmc) || + !mmc_card_is_removable(host->slot->mmc))) { + ret = clk_prepare_enable(host->biu_clk); + if (ret) + return ret; + } + + ret = clk_prepare_enable(host->ciu_clk); + if (ret) + goto err; + + if (!dw_mci_ctrl_reset(host, SDMMC_CTRL_ALL_RESET_FLAGS)) { + clk_disable_unprepare(host->ciu_clk); + ret = -ENODEV; + goto err; + } + + if (host->use_dma && host->dma_ops->init) + host->dma_ops->init(host); + + /* + * Restore the initial value at FIFOTH register + * And Invalidate the prev_blksz with zero + */ + mci_writel(host, FIFOTH, host->fifoth_val); + host->prev_blksz = 0; + + /* Put in max timeout */ + mci_writel(host, TMOUT, 0xFFFFFFFF); + + mci_writel(host, RINTSTS, 0xFFFFFFFF); + mci_writel(host, INTMASK, SDMMC_INT_CMD_DONE | SDMMC_INT_DATA_OVER | + SDMMC_INT_TXDR | SDMMC_INT_RXDR | + DW_MCI_ERROR_FLAGS); + mci_writel(host, CTRL, SDMMC_CTRL_INT_ENABLE); + + + if (host->slot && host->slot->mmc->pm_flags & MMC_PM_KEEP_POWER) + dw_mci_set_ios(host->slot->mmc, &host->slot->mmc->ios); + + /* Force setup bus to guarantee available clock output */ + dw_mci_setup_bus(host->slot, true); + + /* Re-enable SDIO interrupts. */ + if (sdio_irq_claimed(host->slot->mmc)) + __dw_mci_enable_sdio_irq(host->slot, 1); + + /* Now that slots are all setup, we can enable card detect */ + dw_mci_enable_cd(host); + + return 0; + +err: + if (host->slot && + (mmc_can_gpio_cd(host->slot->mmc) || + !mmc_card_is_removable(host->slot->mmc))) + clk_disable_unprepare(host->biu_clk); + + return ret; +} +EXPORT_SYMBOL(dw_mci_runtime_resume); +#endif /* CONFIG_PM */ + +static int __init dw_mci_init(void) +{ + pr_info("Synopsys Designware Multimedia Card Interface Driver\n"); + return 0; +} + +static void __exit dw_mci_exit(void) +{ +} + +module_init(dw_mci_init); +module_exit(dw_mci_exit); + +MODULE_DESCRIPTION("DW Multimedia Card Interface driver"); +MODULE_AUTHOR("NXP Semiconductor VietNam"); +MODULE_AUTHOR("Imagination Technologies Ltd"); +MODULE_LICENSE("GPL v2"); |