diff options
Diffstat (limited to '')
| -rw-r--r-- | drivers/mmc/host/sh_mmcif.c | 1576 |
1 files changed, 1576 insertions, 0 deletions
diff --git a/drivers/mmc/host/sh_mmcif.c b/drivers/mmc/host/sh_mmcif.c new file mode 100644 index 000000000..5dec9e239 --- /dev/null +++ b/drivers/mmc/host/sh_mmcif.c @@ -0,0 +1,1576 @@ +// SPDX-License-Identifier: GPL-2.0 +/* + * MMCIF eMMC driver. + * + * Copyright (C) 2010 Renesas Solutions Corp. + * Yusuke Goda <yusuke.goda.sx@renesas.com> + */ + +/* + * The MMCIF driver is now processing MMC requests asynchronously, according + * to the Linux MMC API requirement. + * + * The MMCIF driver processes MMC requests in up to 3 stages: command, optional + * data, and optional stop. To achieve asynchronous processing each of these + * stages is split into two halves: a top and a bottom half. The top half + * initialises the hardware, installs a timeout handler to handle completion + * timeouts, and returns. In case of the command stage this immediately returns + * control to the caller, leaving all further processing to run asynchronously. + * All further request processing is performed by the bottom halves. + * + * The bottom half further consists of a "hard" IRQ handler, an IRQ handler + * thread, a DMA completion callback, if DMA is used, a timeout work, and + * request- and stage-specific handler methods. + * + * Each bottom half run begins with either a hardware interrupt, a DMA callback + * invocation, or a timeout work run. In case of an error or a successful + * processing completion, the MMC core is informed and the request processing is + * finished. In case processing has to continue, i.e., if data has to be read + * from or written to the card, or if a stop command has to be sent, the next + * top half is called, which performs the necessary hardware handling and + * reschedules the timeout work. This returns the driver state machine into the + * bottom half waiting state. + */ + +#include <linux/bitops.h> +#include <linux/clk.h> +#include <linux/completion.h> +#include <linux/delay.h> +#include <linux/dma-mapping.h> +#include <linux/dmaengine.h> +#include <linux/mmc/card.h> +#include <linux/mmc/core.h> +#include <linux/mmc/host.h> +#include <linux/mmc/mmc.h> +#include <linux/mmc/sdio.h> +#include <linux/mmc/sh_mmcif.h> +#include <linux/mmc/slot-gpio.h> +#include <linux/mod_devicetable.h> +#include <linux/mutex.h> +#include <linux/of_device.h> +#include <linux/pagemap.h> +#include <linux/platform_device.h> +#include <linux/pm_qos.h> +#include <linux/pm_runtime.h> +#include <linux/sh_dma.h> +#include <linux/spinlock.h> +#include <linux/module.h> + +#define DRIVER_NAME "sh_mmcif" + +/* CE_CMD_SET */ +#define CMD_MASK 0x3f000000 +#define CMD_SET_RTYP_NO ((0 << 23) | (0 << 22)) +#define CMD_SET_RTYP_6B ((0 << 23) | (1 << 22)) /* R1/R1b/R3/R4/R5 */ +#define CMD_SET_RTYP_17B ((1 << 23) | (0 << 22)) /* R2 */ +#define CMD_SET_RBSY (1 << 21) /* R1b */ +#define CMD_SET_CCSEN (1 << 20) +#define CMD_SET_WDAT (1 << 19) /* 1: on data, 0: no data */ +#define CMD_SET_DWEN (1 << 18) /* 1: write, 0: read */ +#define CMD_SET_CMLTE (1 << 17) /* 1: multi block trans, 0: single */ +#define CMD_SET_CMD12EN (1 << 16) /* 1: CMD12 auto issue */ +#define CMD_SET_RIDXC_INDEX ((0 << 15) | (0 << 14)) /* index check */ +#define CMD_SET_RIDXC_BITS ((0 << 15) | (1 << 14)) /* check bits check */ +#define CMD_SET_RIDXC_NO ((1 << 15) | (0 << 14)) /* no check */ +#define CMD_SET_CRC7C ((0 << 13) | (0 << 12)) /* CRC7 check*/ +#define CMD_SET_CRC7C_BITS ((0 << 13) | (1 << 12)) /* check bits check*/ +#define CMD_SET_CRC7C_INTERNAL ((1 << 13) | (0 << 12)) /* internal CRC7 check*/ +#define CMD_SET_CRC16C (1 << 10) /* 0: CRC16 check*/ +#define CMD_SET_CRCSTE (1 << 8) /* 1: not receive CRC status */ +#define CMD_SET_TBIT (1 << 7) /* 1: tran mission bit "Low" */ +#define CMD_SET_OPDM (1 << 6) /* 1: open/drain */ +#define CMD_SET_CCSH (1 << 5) +#define CMD_SET_DARS (1 << 2) /* Dual Data Rate */ +#define CMD_SET_DATW_1 ((0 << 1) | (0 << 0)) /* 1bit */ +#define CMD_SET_DATW_4 ((0 << 1) | (1 << 0)) /* 4bit */ +#define CMD_SET_DATW_8 ((1 << 1) | (0 << 0)) /* 8bit */ + +/* CE_CMD_CTRL */ +#define CMD_CTRL_BREAK (1 << 0) + +/* CE_BLOCK_SET */ +#define BLOCK_SIZE_MASK 0x0000ffff + +/* CE_INT */ +#define INT_CCSDE (1 << 29) +#define INT_CMD12DRE (1 << 26) +#define INT_CMD12RBE (1 << 25) +#define INT_CMD12CRE (1 << 24) +#define INT_DTRANE (1 << 23) +#define INT_BUFRE (1 << 22) +#define INT_BUFWEN (1 << 21) +#define INT_BUFREN (1 << 20) +#define INT_CCSRCV (1 << 19) +#define INT_RBSYE (1 << 17) +#define INT_CRSPE (1 << 16) +#define INT_CMDVIO (1 << 15) +#define INT_BUFVIO (1 << 14) +#define INT_WDATERR (1 << 11) +#define INT_RDATERR (1 << 10) +#define INT_RIDXERR (1 << 9) +#define INT_RSPERR (1 << 8) +#define INT_CCSTO (1 << 5) +#define INT_CRCSTO (1 << 4) +#define INT_WDATTO (1 << 3) +#define INT_RDATTO (1 << 2) +#define INT_RBSYTO (1 << 1) +#define INT_RSPTO (1 << 0) +#define INT_ERR_STS (INT_CMDVIO | INT_BUFVIO | INT_WDATERR | \ + INT_RDATERR | INT_RIDXERR | INT_RSPERR | \ + INT_CCSTO | INT_CRCSTO | INT_WDATTO | \ + INT_RDATTO | INT_RBSYTO | INT_RSPTO) + +#define INT_ALL (INT_RBSYE | INT_CRSPE | INT_BUFREN | \ + INT_BUFWEN | INT_CMD12DRE | INT_BUFRE | \ + INT_DTRANE | INT_CMD12RBE | INT_CMD12CRE) + +#define INT_CCS (INT_CCSTO | INT_CCSRCV | INT_CCSDE) + +/* CE_INT_MASK */ +#define MASK_ALL 0x00000000 +#define MASK_MCCSDE (1 << 29) +#define MASK_MCMD12DRE (1 << 26) +#define MASK_MCMD12RBE (1 << 25) +#define MASK_MCMD12CRE (1 << 24) +#define MASK_MDTRANE (1 << 23) +#define MASK_MBUFRE (1 << 22) +#define MASK_MBUFWEN (1 << 21) +#define MASK_MBUFREN (1 << 20) +#define MASK_MCCSRCV (1 << 19) +#define MASK_MRBSYE (1 << 17) +#define MASK_MCRSPE (1 << 16) +#define MASK_MCMDVIO (1 << 15) +#define MASK_MBUFVIO (1 << 14) +#define MASK_MWDATERR (1 << 11) +#define MASK_MRDATERR (1 << 10) +#define MASK_MRIDXERR (1 << 9) +#define MASK_MRSPERR (1 << 8) +#define MASK_MCCSTO (1 << 5) +#define MASK_MCRCSTO (1 << 4) +#define MASK_MWDATTO (1 << 3) +#define MASK_MRDATTO (1 << 2) +#define MASK_MRBSYTO (1 << 1) +#define MASK_MRSPTO (1 << 0) + +#define MASK_START_CMD (MASK_MCMDVIO | MASK_MBUFVIO | MASK_MWDATERR | \ + MASK_MRDATERR | MASK_MRIDXERR | MASK_MRSPERR | \ + MASK_MCRCSTO | MASK_MWDATTO | \ + MASK_MRDATTO | MASK_MRBSYTO | MASK_MRSPTO) + +#define MASK_CLEAN (INT_ERR_STS | MASK_MRBSYE | MASK_MCRSPE | \ + MASK_MBUFREN | MASK_MBUFWEN | \ + MASK_MCMD12DRE | MASK_MBUFRE | MASK_MDTRANE | \ + MASK_MCMD12RBE | MASK_MCMD12CRE) + +/* CE_HOST_STS1 */ +#define STS1_CMDSEQ (1 << 31) + +/* CE_HOST_STS2 */ +#define STS2_CRCSTE (1 << 31) +#define STS2_CRC16E (1 << 30) +#define STS2_AC12CRCE (1 << 29) +#define STS2_RSPCRC7E (1 << 28) +#define STS2_CRCSTEBE (1 << 27) +#define STS2_RDATEBE (1 << 26) +#define STS2_AC12REBE (1 << 25) +#define STS2_RSPEBE (1 << 24) +#define STS2_AC12IDXE (1 << 23) +#define STS2_RSPIDXE (1 << 22) +#define STS2_CCSTO (1 << 15) +#define STS2_RDATTO (1 << 14) +#define STS2_DATBSYTO (1 << 13) +#define STS2_CRCSTTO (1 << 12) +#define STS2_AC12BSYTO (1 << 11) +#define STS2_RSPBSYTO (1 << 10) +#define STS2_AC12RSPTO (1 << 9) +#define STS2_RSPTO (1 << 8) +#define STS2_CRC_ERR (STS2_CRCSTE | STS2_CRC16E | \ + STS2_AC12CRCE | STS2_RSPCRC7E | STS2_CRCSTEBE) +#define STS2_TIMEOUT_ERR (STS2_CCSTO | STS2_RDATTO | \ + STS2_DATBSYTO | STS2_CRCSTTO | \ + STS2_AC12BSYTO | STS2_RSPBSYTO | \ + STS2_AC12RSPTO | STS2_RSPTO) + +#define CLKDEV_EMMC_DATA 52000000 /* 52 MHz */ +#define CLKDEV_MMC_DATA 20000000 /* 20 MHz */ +#define CLKDEV_INIT 400000 /* 400 kHz */ + +enum sh_mmcif_state { + STATE_IDLE, + STATE_REQUEST, + STATE_IOS, + STATE_TIMEOUT, +}; + +enum sh_mmcif_wait_for { + MMCIF_WAIT_FOR_REQUEST, + MMCIF_WAIT_FOR_CMD, + MMCIF_WAIT_FOR_MREAD, + MMCIF_WAIT_FOR_MWRITE, + MMCIF_WAIT_FOR_READ, + MMCIF_WAIT_FOR_WRITE, + MMCIF_WAIT_FOR_READ_END, + MMCIF_WAIT_FOR_WRITE_END, + MMCIF_WAIT_FOR_STOP, +}; + +/* + * difference for each SoC + */ +struct sh_mmcif_host { + struct mmc_host *mmc; + struct mmc_request *mrq; + struct platform_device *pd; + struct clk *clk; + int bus_width; + unsigned char timing; + bool sd_error; + bool dying; + long timeout; + void __iomem *addr; + u32 *pio_ptr; + spinlock_t lock; /* protect sh_mmcif_host::state */ + enum sh_mmcif_state state; + enum sh_mmcif_wait_for wait_for; + struct delayed_work timeout_work; + size_t blocksize; + int sg_idx; + int sg_blkidx; + bool power; + bool ccs_enable; /* Command Completion Signal support */ + bool clk_ctrl2_enable; + struct mutex thread_lock; + u32 clkdiv_map; /* see CE_CLK_CTRL::CLKDIV */ + + /* DMA support */ + struct dma_chan *chan_rx; + struct dma_chan *chan_tx; + struct completion dma_complete; + bool dma_active; +}; + +static const struct of_device_id sh_mmcif_of_match[] = { + { .compatible = "renesas,sh-mmcif" }, + { } +}; +MODULE_DEVICE_TABLE(of, sh_mmcif_of_match); + +#define sh_mmcif_host_to_dev(host) (&host->pd->dev) + +static inline void sh_mmcif_bitset(struct sh_mmcif_host *host, + unsigned int reg, u32 val) +{ + writel(val | readl(host->addr + reg), host->addr + reg); +} + +static inline void sh_mmcif_bitclr(struct sh_mmcif_host *host, + unsigned int reg, u32 val) +{ + writel(~val & readl(host->addr + reg), host->addr + reg); +} + +static void sh_mmcif_dma_complete(void *arg) +{ + struct sh_mmcif_host *host = arg; + struct mmc_request *mrq = host->mrq; + struct device *dev = sh_mmcif_host_to_dev(host); + + dev_dbg(dev, "Command completed\n"); + + if (WARN(!mrq || !mrq->data, "%s: NULL data in DMA completion!\n", + dev_name(dev))) + return; + + complete(&host->dma_complete); +} + +static void sh_mmcif_start_dma_rx(struct sh_mmcif_host *host) +{ + struct mmc_data *data = host->mrq->data; + struct scatterlist *sg = data->sg; + struct dma_async_tx_descriptor *desc = NULL; + struct dma_chan *chan = host->chan_rx; + struct device *dev = sh_mmcif_host_to_dev(host); + dma_cookie_t cookie = -EINVAL; + int ret; + + ret = dma_map_sg(chan->device->dev, sg, data->sg_len, + DMA_FROM_DEVICE); + if (ret > 0) { + host->dma_active = true; + desc = dmaengine_prep_slave_sg(chan, sg, ret, + DMA_DEV_TO_MEM, DMA_PREP_INTERRUPT | DMA_CTRL_ACK); + } + + if (desc) { + desc->callback = sh_mmcif_dma_complete; + desc->callback_param = host; + cookie = dmaengine_submit(desc); + sh_mmcif_bitset(host, MMCIF_CE_BUF_ACC, BUF_ACC_DMAREN); + dma_async_issue_pending(chan); + } + dev_dbg(dev, "%s(): mapped %d -> %d, cookie %d\n", + __func__, data->sg_len, ret, cookie); + + if (!desc) { + /* DMA failed, fall back to PIO */ + if (ret >= 0) + ret = -EIO; + host->chan_rx = NULL; + host->dma_active = false; + dma_release_channel(chan); + /* Free the Tx channel too */ + chan = host->chan_tx; + if (chan) { + host->chan_tx = NULL; + dma_release_channel(chan); + } + dev_warn(dev, + "DMA failed: %d, falling back to PIO\n", ret); + sh_mmcif_bitclr(host, MMCIF_CE_BUF_ACC, BUF_ACC_DMAREN | BUF_ACC_DMAWEN); + } + + dev_dbg(dev, "%s(): desc %p, cookie %d, sg[%d]\n", __func__, + desc, cookie, data->sg_len); +} + +static void sh_mmcif_start_dma_tx(struct sh_mmcif_host *host) +{ + struct mmc_data *data = host->mrq->data; + struct scatterlist *sg = data->sg; + struct dma_async_tx_descriptor *desc = NULL; + struct dma_chan *chan = host->chan_tx; + struct device *dev = sh_mmcif_host_to_dev(host); + dma_cookie_t cookie = -EINVAL; + int ret; + + ret = dma_map_sg(chan->device->dev, sg, data->sg_len, + DMA_TO_DEVICE); + if (ret > 0) { + host->dma_active = true; + desc = dmaengine_prep_slave_sg(chan, sg, ret, + DMA_MEM_TO_DEV, DMA_PREP_INTERRUPT | DMA_CTRL_ACK); + } + + if (desc) { + desc->callback = sh_mmcif_dma_complete; + desc->callback_param = host; + cookie = dmaengine_submit(desc); + sh_mmcif_bitset(host, MMCIF_CE_BUF_ACC, BUF_ACC_DMAWEN); + dma_async_issue_pending(chan); + } + dev_dbg(dev, "%s(): mapped %d -> %d, cookie %d\n", + __func__, data->sg_len, ret, cookie); + + if (!desc) { + /* DMA failed, fall back to PIO */ + if (ret >= 0) + ret = -EIO; + host->chan_tx = NULL; + host->dma_active = false; + dma_release_channel(chan); + /* Free the Rx channel too */ + chan = host->chan_rx; + if (chan) { + host->chan_rx = NULL; + dma_release_channel(chan); + } + dev_warn(dev, + "DMA failed: %d, falling back to PIO\n", ret); + sh_mmcif_bitclr(host, MMCIF_CE_BUF_ACC, BUF_ACC_DMAREN | BUF_ACC_DMAWEN); + } + + dev_dbg(dev, "%s(): desc %p, cookie %d\n", __func__, + desc, cookie); +} + +static struct dma_chan * +sh_mmcif_request_dma_pdata(struct sh_mmcif_host *host, uintptr_t slave_id) +{ + dma_cap_mask_t mask; + + dma_cap_zero(mask); + dma_cap_set(DMA_SLAVE, mask); + if (slave_id <= 0) + return NULL; + + return dma_request_channel(mask, shdma_chan_filter, (void *)slave_id); +} + +static int sh_mmcif_dma_slave_config(struct sh_mmcif_host *host, + struct dma_chan *chan, + enum dma_transfer_direction direction) +{ + struct resource *res; + struct dma_slave_config cfg = { 0, }; + + res = platform_get_resource(host->pd, IORESOURCE_MEM, 0); + cfg.direction = direction; + + if (direction == DMA_DEV_TO_MEM) { + cfg.src_addr = res->start + MMCIF_CE_DATA; + cfg.src_addr_width = DMA_SLAVE_BUSWIDTH_4_BYTES; + } else { + cfg.dst_addr = res->start + MMCIF_CE_DATA; + cfg.dst_addr_width = DMA_SLAVE_BUSWIDTH_4_BYTES; + } + + return dmaengine_slave_config(chan, &cfg); +} + +static void sh_mmcif_request_dma(struct sh_mmcif_host *host) +{ + struct device *dev = sh_mmcif_host_to_dev(host); + host->dma_active = false; + + /* We can only either use DMA for both Tx and Rx or not use it at all */ + if (IS_ENABLED(CONFIG_SUPERH) && dev->platform_data) { + struct sh_mmcif_plat_data *pdata = dev->platform_data; + + host->chan_tx = sh_mmcif_request_dma_pdata(host, + pdata->slave_id_tx); + host->chan_rx = sh_mmcif_request_dma_pdata(host, + pdata->slave_id_rx); + } else { + host->chan_tx = dma_request_chan(dev, "tx"); + if (IS_ERR(host->chan_tx)) + host->chan_tx = NULL; + host->chan_rx = dma_request_chan(dev, "rx"); + if (IS_ERR(host->chan_rx)) + host->chan_rx = NULL; + } + dev_dbg(dev, "%s: got channel TX %p RX %p\n", __func__, host->chan_tx, + host->chan_rx); + + if (!host->chan_tx || !host->chan_rx || + sh_mmcif_dma_slave_config(host, host->chan_tx, DMA_MEM_TO_DEV) || + sh_mmcif_dma_slave_config(host, host->chan_rx, DMA_DEV_TO_MEM)) + goto error; + + return; + +error: + if (host->chan_tx) + dma_release_channel(host->chan_tx); + if (host->chan_rx) + dma_release_channel(host->chan_rx); + host->chan_tx = host->chan_rx = NULL; +} + +static void sh_mmcif_release_dma(struct sh_mmcif_host *host) +{ + sh_mmcif_bitclr(host, MMCIF_CE_BUF_ACC, BUF_ACC_DMAREN | BUF_ACC_DMAWEN); + /* Descriptors are freed automatically */ + if (host->chan_tx) { + struct dma_chan *chan = host->chan_tx; + host->chan_tx = NULL; + dma_release_channel(chan); + } + if (host->chan_rx) { + struct dma_chan *chan = host->chan_rx; + host->chan_rx = NULL; + dma_release_channel(chan); + } + + host->dma_active = false; +} + +static void sh_mmcif_clock_control(struct sh_mmcif_host *host, unsigned int clk) +{ + struct device *dev = sh_mmcif_host_to_dev(host); + struct sh_mmcif_plat_data *p = dev->platform_data; + bool sup_pclk = p ? p->sup_pclk : false; + unsigned int current_clk = clk_get_rate(host->clk); + unsigned int clkdiv; + + sh_mmcif_bitclr(host, MMCIF_CE_CLK_CTRL, CLK_ENABLE); + sh_mmcif_bitclr(host, MMCIF_CE_CLK_CTRL, CLK_CLEAR); + + if (!clk) + return; + + if (host->clkdiv_map) { + unsigned int freq, best_freq, myclk, div, diff_min, diff; + int i; + + clkdiv = 0; + diff_min = ~0; + best_freq = 0; + for (i = 31; i >= 0; i--) { + if (!((1 << i) & host->clkdiv_map)) + continue; + + /* + * clk = parent_freq / div + * -> parent_freq = clk x div + */ + + div = 1 << (i + 1); + freq = clk_round_rate(host->clk, clk * div); + myclk = freq / div; + diff = (myclk > clk) ? myclk - clk : clk - myclk; + + if (diff <= diff_min) { + best_freq = freq; + clkdiv = i; + diff_min = diff; + } + } + + dev_dbg(dev, "clk %u/%u (%u, 0x%x)\n", + (best_freq / (1 << (clkdiv + 1))), clk, + best_freq, clkdiv); + + clk_set_rate(host->clk, best_freq); + clkdiv = clkdiv << 16; + } else if (sup_pclk && clk == current_clk) { + clkdiv = CLK_SUP_PCLK; + } else { + clkdiv = (fls(DIV_ROUND_UP(current_clk, clk) - 1) - 1) << 16; + } + + sh_mmcif_bitset(host, MMCIF_CE_CLK_CTRL, CLK_CLEAR & clkdiv); + sh_mmcif_bitset(host, MMCIF_CE_CLK_CTRL, CLK_ENABLE); +} + +static void sh_mmcif_sync_reset(struct sh_mmcif_host *host) +{ + u32 tmp; + + tmp = 0x010f0000 & sh_mmcif_readl(host->addr, MMCIF_CE_CLK_CTRL); + + sh_mmcif_writel(host->addr, MMCIF_CE_VERSION, SOFT_RST_ON); + sh_mmcif_writel(host->addr, MMCIF_CE_VERSION, SOFT_RST_OFF); + if (host->ccs_enable) + tmp |= SCCSTO_29; + if (host->clk_ctrl2_enable) + sh_mmcif_writel(host->addr, MMCIF_CE_CLK_CTRL2, 0x0F0F0000); + sh_mmcif_bitset(host, MMCIF_CE_CLK_CTRL, tmp | + SRSPTO_256 | SRBSYTO_29 | SRWDTO_29); + /* byte swap on */ + sh_mmcif_bitset(host, MMCIF_CE_BUF_ACC, BUF_ACC_ATYP); +} + +static int sh_mmcif_error_manage(struct sh_mmcif_host *host) +{ + struct device *dev = sh_mmcif_host_to_dev(host); + u32 state1, state2; + int ret, timeout; + + host->sd_error = false; + + state1 = sh_mmcif_readl(host->addr, MMCIF_CE_HOST_STS1); + state2 = sh_mmcif_readl(host->addr, MMCIF_CE_HOST_STS2); + dev_dbg(dev, "ERR HOST_STS1 = %08x\n", state1); + dev_dbg(dev, "ERR HOST_STS2 = %08x\n", state2); + + if (state1 & STS1_CMDSEQ) { + sh_mmcif_bitset(host, MMCIF_CE_CMD_CTRL, CMD_CTRL_BREAK); + sh_mmcif_bitset(host, MMCIF_CE_CMD_CTRL, ~CMD_CTRL_BREAK); + for (timeout = 10000; timeout; timeout--) { + if (!(sh_mmcif_readl(host->addr, MMCIF_CE_HOST_STS1) + & STS1_CMDSEQ)) + break; + mdelay(1); + } + if (!timeout) { + dev_err(dev, + "Forced end of command sequence timeout err\n"); + return -EIO; + } + sh_mmcif_sync_reset(host); + dev_dbg(dev, "Forced end of command sequence\n"); + return -EIO; + } + + if (state2 & STS2_CRC_ERR) { + dev_err(dev, " CRC error: state %u, wait %u\n", + host->state, host->wait_for); + ret = -EIO; + } else if (state2 & STS2_TIMEOUT_ERR) { + dev_err(dev, " Timeout: state %u, wait %u\n", + host->state, host->wait_for); + ret = -ETIMEDOUT; + } else { + dev_dbg(dev, " End/Index error: state %u, wait %u\n", + host->state, host->wait_for); + ret = -EIO; + } + return ret; +} + +static bool sh_mmcif_next_block(struct sh_mmcif_host *host, u32 *p) +{ + struct mmc_data *data = host->mrq->data; + + host->sg_blkidx += host->blocksize; + + /* data->sg->length must be a multiple of host->blocksize? */ + BUG_ON(host->sg_blkidx > data->sg->length); + + if (host->sg_blkidx == data->sg->length) { + host->sg_blkidx = 0; + if (++host->sg_idx < data->sg_len) + host->pio_ptr = sg_virt(++data->sg); + } else { + host->pio_ptr = p; + } + + return host->sg_idx != data->sg_len; +} + +static void sh_mmcif_single_read(struct sh_mmcif_host *host, + struct mmc_request *mrq) +{ + host->blocksize = (sh_mmcif_readl(host->addr, MMCIF_CE_BLOCK_SET) & + BLOCK_SIZE_MASK) + 3; + + host->wait_for = MMCIF_WAIT_FOR_READ; + + /* buf read enable */ + sh_mmcif_bitset(host, MMCIF_CE_INT_MASK, MASK_MBUFREN); +} + +static bool sh_mmcif_read_block(struct sh_mmcif_host *host) +{ + struct device *dev = sh_mmcif_host_to_dev(host); + struct mmc_data *data = host->mrq->data; + u32 *p = sg_virt(data->sg); + int i; + + if (host->sd_error) { + data->error = sh_mmcif_error_manage(host); + dev_dbg(dev, "%s(): %d\n", __func__, data->error); + return false; + } + + for (i = 0; i < host->blocksize / 4; i++) + *p++ = sh_mmcif_readl(host->addr, MMCIF_CE_DATA); + + /* buffer read end */ + sh_mmcif_bitset(host, MMCIF_CE_INT_MASK, MASK_MBUFRE); + host->wait_for = MMCIF_WAIT_FOR_READ_END; + + return true; +} + +static void sh_mmcif_multi_read(struct sh_mmcif_host *host, + struct mmc_request *mrq) +{ + struct mmc_data *data = mrq->data; + + if (!data->sg_len || !data->sg->length) + return; + + host->blocksize = sh_mmcif_readl(host->addr, MMCIF_CE_BLOCK_SET) & + BLOCK_SIZE_MASK; + + host->wait_for = MMCIF_WAIT_FOR_MREAD; + host->sg_idx = 0; + host->sg_blkidx = 0; + host->pio_ptr = sg_virt(data->sg); + + sh_mmcif_bitset(host, MMCIF_CE_INT_MASK, MASK_MBUFREN); +} + +static bool sh_mmcif_mread_block(struct sh_mmcif_host *host) +{ + struct device *dev = sh_mmcif_host_to_dev(host); + struct mmc_data *data = host->mrq->data; + u32 *p = host->pio_ptr; + int i; + + if (host->sd_error) { + data->error = sh_mmcif_error_manage(host); + dev_dbg(dev, "%s(): %d\n", __func__, data->error); + return false; + } + + BUG_ON(!data->sg->length); + + for (i = 0; i < host->blocksize / 4; i++) + *p++ = sh_mmcif_readl(host->addr, MMCIF_CE_DATA); + + if (!sh_mmcif_next_block(host, p)) + return false; + + sh_mmcif_bitset(host, MMCIF_CE_INT_MASK, MASK_MBUFREN); + + return true; +} + +static void sh_mmcif_single_write(struct sh_mmcif_host *host, + struct mmc_request *mrq) +{ + host->blocksize = (sh_mmcif_readl(host->addr, MMCIF_CE_BLOCK_SET) & + BLOCK_SIZE_MASK) + 3; + + host->wait_for = MMCIF_WAIT_FOR_WRITE; + + /* buf write enable */ + sh_mmcif_bitset(host, MMCIF_CE_INT_MASK, MASK_MBUFWEN); +} + +static bool sh_mmcif_write_block(struct sh_mmcif_host *host) +{ + struct device *dev = sh_mmcif_host_to_dev(host); + struct mmc_data *data = host->mrq->data; + u32 *p = sg_virt(data->sg); + int i; + + if (host->sd_error) { + data->error = sh_mmcif_error_manage(host); + dev_dbg(dev, "%s(): %d\n", __func__, data->error); + return false; + } + + for (i = 0; i < host->blocksize / 4; i++) + sh_mmcif_writel(host->addr, MMCIF_CE_DATA, *p++); + + /* buffer write end */ + sh_mmcif_bitset(host, MMCIF_CE_INT_MASK, MASK_MDTRANE); + host->wait_for = MMCIF_WAIT_FOR_WRITE_END; + + return true; +} + +static void sh_mmcif_multi_write(struct sh_mmcif_host *host, + struct mmc_request *mrq) +{ + struct mmc_data *data = mrq->data; + + if (!data->sg_len || !data->sg->length) + return; + + host->blocksize = sh_mmcif_readl(host->addr, MMCIF_CE_BLOCK_SET) & + BLOCK_SIZE_MASK; + + host->wait_for = MMCIF_WAIT_FOR_MWRITE; + host->sg_idx = 0; + host->sg_blkidx = 0; + host->pio_ptr = sg_virt(data->sg); + + sh_mmcif_bitset(host, MMCIF_CE_INT_MASK, MASK_MBUFWEN); +} + +static bool sh_mmcif_mwrite_block(struct sh_mmcif_host *host) +{ + struct device *dev = sh_mmcif_host_to_dev(host); + struct mmc_data *data = host->mrq->data; + u32 *p = host->pio_ptr; + int i; + + if (host->sd_error) { + data->error = sh_mmcif_error_manage(host); + dev_dbg(dev, "%s(): %d\n", __func__, data->error); + return false; + } + + BUG_ON(!data->sg->length); + + for (i = 0; i < host->blocksize / 4; i++) + sh_mmcif_writel(host->addr, MMCIF_CE_DATA, *p++); + + if (!sh_mmcif_next_block(host, p)) + return false; + + sh_mmcif_bitset(host, MMCIF_CE_INT_MASK, MASK_MBUFWEN); + + return true; +} + +static void sh_mmcif_get_response(struct sh_mmcif_host *host, + struct mmc_command *cmd) +{ + if (cmd->flags & MMC_RSP_136) { + cmd->resp[0] = sh_mmcif_readl(host->addr, MMCIF_CE_RESP3); + cmd->resp[1] = sh_mmcif_readl(host->addr, MMCIF_CE_RESP2); + cmd->resp[2] = sh_mmcif_readl(host->addr, MMCIF_CE_RESP1); + cmd->resp[3] = sh_mmcif_readl(host->addr, MMCIF_CE_RESP0); + } else + cmd->resp[0] = sh_mmcif_readl(host->addr, MMCIF_CE_RESP0); +} + +static void sh_mmcif_get_cmd12response(struct sh_mmcif_host *host, + struct mmc_command *cmd) +{ + cmd->resp[0] = sh_mmcif_readl(host->addr, MMCIF_CE_RESP_CMD12); +} + +static u32 sh_mmcif_set_cmd(struct sh_mmcif_host *host, + struct mmc_request *mrq) +{ + struct device *dev = sh_mmcif_host_to_dev(host); + struct mmc_data *data = mrq->data; + struct mmc_command *cmd = mrq->cmd; + u32 opc = cmd->opcode; + u32 tmp = 0; + + /* Response Type check */ + switch (mmc_resp_type(cmd)) { + case MMC_RSP_NONE: + tmp |= CMD_SET_RTYP_NO; + break; + case MMC_RSP_R1: + case MMC_RSP_R3: + tmp |= CMD_SET_RTYP_6B; + break; + case MMC_RSP_R1B: + tmp |= CMD_SET_RBSY | CMD_SET_RTYP_6B; + break; + case MMC_RSP_R2: + tmp |= CMD_SET_RTYP_17B; + break; + default: + dev_err(dev, "Unsupported response type.\n"); + break; + } + + /* WDAT / DATW */ + if (data) { + tmp |= CMD_SET_WDAT; + switch (host->bus_width) { + case MMC_BUS_WIDTH_1: + tmp |= CMD_SET_DATW_1; + break; + case MMC_BUS_WIDTH_4: + tmp |= CMD_SET_DATW_4; + break; + case MMC_BUS_WIDTH_8: + tmp |= CMD_SET_DATW_8; + break; + default: + dev_err(dev, "Unsupported bus width.\n"); + break; + } + switch (host->timing) { + case MMC_TIMING_MMC_DDR52: + /* + * MMC core will only set this timing, if the host + * advertises the MMC_CAP_1_8V_DDR/MMC_CAP_1_2V_DDR + * capability. MMCIF implementations with this + * capability, e.g. sh73a0, will have to set it + * in their platform data. + */ + tmp |= CMD_SET_DARS; + break; + } + } + /* DWEN */ + if (opc == MMC_WRITE_BLOCK || opc == MMC_WRITE_MULTIPLE_BLOCK) + tmp |= CMD_SET_DWEN; + /* CMLTE/CMD12EN */ + if (opc == MMC_READ_MULTIPLE_BLOCK || opc == MMC_WRITE_MULTIPLE_BLOCK) { + tmp |= CMD_SET_CMLTE | CMD_SET_CMD12EN; + sh_mmcif_bitset(host, MMCIF_CE_BLOCK_SET, + data->blocks << 16); + } + /* RIDXC[1:0] check bits */ + if (opc == MMC_SEND_OP_COND || opc == MMC_ALL_SEND_CID || + opc == MMC_SEND_CSD || opc == MMC_SEND_CID) + tmp |= CMD_SET_RIDXC_BITS; + /* RCRC7C[1:0] check bits */ + if (opc == MMC_SEND_OP_COND) + tmp |= CMD_SET_CRC7C_BITS; + /* RCRC7C[1:0] internal CRC7 */ + if (opc == MMC_ALL_SEND_CID || + opc == MMC_SEND_CSD || opc == MMC_SEND_CID) + tmp |= CMD_SET_CRC7C_INTERNAL; + + return (opc << 24) | tmp; +} + +static int sh_mmcif_data_trans(struct sh_mmcif_host *host, + struct mmc_request *mrq, u32 opc) +{ + struct device *dev = sh_mmcif_host_to_dev(host); + + switch (opc) { + case MMC_READ_MULTIPLE_BLOCK: + sh_mmcif_multi_read(host, mrq); + return 0; + case MMC_WRITE_MULTIPLE_BLOCK: + sh_mmcif_multi_write(host, mrq); + return 0; + case MMC_WRITE_BLOCK: + sh_mmcif_single_write(host, mrq); + return 0; + case MMC_READ_SINGLE_BLOCK: + case MMC_SEND_EXT_CSD: + sh_mmcif_single_read(host, mrq); + return 0; + default: + dev_err(dev, "Unsupported CMD%d\n", opc); + return -EINVAL; + } +} + +static void sh_mmcif_start_cmd(struct sh_mmcif_host *host, + struct mmc_request *mrq) +{ + struct mmc_command *cmd = mrq->cmd; + u32 opc; + u32 mask = 0; + unsigned long flags; + + if (cmd->flags & MMC_RSP_BUSY) + mask = MASK_START_CMD | MASK_MRBSYE; + else + mask = MASK_START_CMD | MASK_MCRSPE; + + if (host->ccs_enable) + mask |= MASK_MCCSTO; + + if (mrq->data) { + sh_mmcif_writel(host->addr, MMCIF_CE_BLOCK_SET, 0); + sh_mmcif_writel(host->addr, MMCIF_CE_BLOCK_SET, + mrq->data->blksz); + } + opc = sh_mmcif_set_cmd(host, mrq); + + if (host->ccs_enable) + sh_mmcif_writel(host->addr, MMCIF_CE_INT, 0xD80430C0); + else + sh_mmcif_writel(host->addr, MMCIF_CE_INT, 0xD80430C0 | INT_CCS); + sh_mmcif_writel(host->addr, MMCIF_CE_INT_MASK, mask); + /* set arg */ + sh_mmcif_writel(host->addr, MMCIF_CE_ARG, cmd->arg); + /* set cmd */ + spin_lock_irqsave(&host->lock, flags); + sh_mmcif_writel(host->addr, MMCIF_CE_CMD_SET, opc); + + host->wait_for = MMCIF_WAIT_FOR_CMD; + schedule_delayed_work(&host->timeout_work, host->timeout); + spin_unlock_irqrestore(&host->lock, flags); +} + +static void sh_mmcif_stop_cmd(struct sh_mmcif_host *host, + struct mmc_request *mrq) +{ + struct device *dev = sh_mmcif_host_to_dev(host); + + switch (mrq->cmd->opcode) { + case MMC_READ_MULTIPLE_BLOCK: + sh_mmcif_bitset(host, MMCIF_CE_INT_MASK, MASK_MCMD12DRE); + break; + case MMC_WRITE_MULTIPLE_BLOCK: + sh_mmcif_bitset(host, MMCIF_CE_INT_MASK, MASK_MCMD12RBE); + break; + default: + dev_err(dev, "unsupported stop cmd\n"); + mrq->stop->error = sh_mmcif_error_manage(host); + return; + } + + host->wait_for = MMCIF_WAIT_FOR_STOP; +} + +static void sh_mmcif_request(struct mmc_host *mmc, struct mmc_request *mrq) +{ + struct sh_mmcif_host *host = mmc_priv(mmc); + struct device *dev = sh_mmcif_host_to_dev(host); + unsigned long flags; + + spin_lock_irqsave(&host->lock, flags); + if (host->state != STATE_IDLE) { + dev_dbg(dev, "%s() rejected, state %u\n", + __func__, host->state); + spin_unlock_irqrestore(&host->lock, flags); + mrq->cmd->error = -EAGAIN; + mmc_request_done(mmc, mrq); + return; + } + + host->state = STATE_REQUEST; + spin_unlock_irqrestore(&host->lock, flags); + + host->mrq = mrq; + + sh_mmcif_start_cmd(host, mrq); +} + +static void sh_mmcif_clk_setup(struct sh_mmcif_host *host) +{ + struct device *dev = sh_mmcif_host_to_dev(host); + + if (host->mmc->f_max) { + unsigned int f_max, f_min = 0, f_min_old; + + f_max = host->mmc->f_max; + for (f_min_old = f_max; f_min_old > 2;) { + f_min = clk_round_rate(host->clk, f_min_old / 2); + if (f_min == f_min_old) + break; + f_min_old = f_min; + } + + /* + * This driver assumes this SoC is R-Car Gen2 or later + */ + host->clkdiv_map = 0x3ff; + + host->mmc->f_max = f_max / (1 << ffs(host->clkdiv_map)); + host->mmc->f_min = f_min / (1 << fls(host->clkdiv_map)); + } else { + unsigned int clk = clk_get_rate(host->clk); + + host->mmc->f_max = clk / 2; + host->mmc->f_min = clk / 512; + } + + dev_dbg(dev, "clk max/min = %d/%d\n", + host->mmc->f_max, host->mmc->f_min); +} + +static void sh_mmcif_set_ios(struct mmc_host *mmc, struct mmc_ios *ios) +{ + struct sh_mmcif_host *host = mmc_priv(mmc); + struct device *dev = sh_mmcif_host_to_dev(host); + unsigned long flags; + + spin_lock_irqsave(&host->lock, flags); + if (host->state != STATE_IDLE) { + dev_dbg(dev, "%s() rejected, state %u\n", + __func__, host->state); + spin_unlock_irqrestore(&host->lock, flags); + return; + } + + host->state = STATE_IOS; + spin_unlock_irqrestore(&host->lock, flags); + + switch (ios->power_mode) { + case MMC_POWER_UP: + if (!IS_ERR(mmc->supply.vmmc)) + mmc_regulator_set_ocr(mmc, mmc->supply.vmmc, ios->vdd); + if (!host->power) { + clk_prepare_enable(host->clk); + pm_runtime_get_sync(dev); + sh_mmcif_sync_reset(host); + sh_mmcif_request_dma(host); + host->power = true; + } + break; + case MMC_POWER_OFF: + if (!IS_ERR(mmc->supply.vmmc)) + mmc_regulator_set_ocr(mmc, mmc->supply.vmmc, 0); + if (host->power) { + sh_mmcif_clock_control(host, 0); + sh_mmcif_release_dma(host); + pm_runtime_put(dev); + clk_disable_unprepare(host->clk); + host->power = false; + } + break; + case MMC_POWER_ON: + sh_mmcif_clock_control(host, ios->clock); + break; + } + + host->timing = ios->timing; + host->bus_width = ios->bus_width; + host->state = STATE_IDLE; +} + +static const struct mmc_host_ops sh_mmcif_ops = { + .request = sh_mmcif_request, + .set_ios = sh_mmcif_set_ios, + .get_cd = mmc_gpio_get_cd, +}; + +static bool sh_mmcif_end_cmd(struct sh_mmcif_host *host) +{ + struct mmc_command *cmd = host->mrq->cmd; + struct mmc_data *data = host->mrq->data; + struct device *dev = sh_mmcif_host_to_dev(host); + long time; + + if (host->sd_error) { + switch (cmd->opcode) { + case MMC_ALL_SEND_CID: + case MMC_SELECT_CARD: + case MMC_APP_CMD: + cmd->error = -ETIMEDOUT; + break; + default: + cmd->error = sh_mmcif_error_manage(host); + break; + } + dev_dbg(dev, "CMD%d error %d\n", + cmd->opcode, cmd->error); + host->sd_error = false; + return false; + } + if (!(cmd->flags & MMC_RSP_PRESENT)) { + cmd->error = 0; + return false; + } + + sh_mmcif_get_response(host, cmd); + + if (!data) + return false; + + /* + * Completion can be signalled from DMA callback and error, so, have to + * reset here, before setting .dma_active + */ + init_completion(&host->dma_complete); + + if (data->flags & MMC_DATA_READ) { + if (host->chan_rx) + sh_mmcif_start_dma_rx(host); + } else { + if (host->chan_tx) + sh_mmcif_start_dma_tx(host); + } + + if (!host->dma_active) { + data->error = sh_mmcif_data_trans(host, host->mrq, cmd->opcode); + return !data->error; + } + + /* Running in the IRQ thread, can sleep */ + time = wait_for_completion_interruptible_timeout(&host->dma_complete, + host->timeout); + + if (data->flags & MMC_DATA_READ) + dma_unmap_sg(host->chan_rx->device->dev, + data->sg, data->sg_len, + DMA_FROM_DEVICE); + else + dma_unmap_sg(host->chan_tx->device->dev, + data->sg, data->sg_len, + DMA_TO_DEVICE); + + if (host->sd_error) { + dev_err(host->mmc->parent, + "Error IRQ while waiting for DMA completion!\n"); + /* Woken up by an error IRQ: abort DMA */ + data->error = sh_mmcif_error_manage(host); + } else if (!time) { + dev_err(host->mmc->parent, "DMA timeout!\n"); + data->error = -ETIMEDOUT; + } else if (time < 0) { + dev_err(host->mmc->parent, + "wait_for_completion_...() error %ld!\n", time); + data->error = time; + } + sh_mmcif_bitclr(host, MMCIF_CE_BUF_ACC, + BUF_ACC_DMAREN | BUF_ACC_DMAWEN); + host->dma_active = false; + + if (data->error) { + data->bytes_xfered = 0; + /* Abort DMA */ + if (data->flags & MMC_DATA_READ) + dmaengine_terminate_all(host->chan_rx); + else + dmaengine_terminate_all(host->chan_tx); + } + + return false; +} + +static irqreturn_t sh_mmcif_irqt(int irq, void *dev_id) +{ + struct sh_mmcif_host *host = dev_id; + struct mmc_request *mrq; + struct device *dev = sh_mmcif_host_to_dev(host); + bool wait = false; + unsigned long flags; + int wait_work; + + spin_lock_irqsave(&host->lock, flags); + wait_work = host->wait_for; + spin_unlock_irqrestore(&host->lock, flags); + + cancel_delayed_work_sync(&host->timeout_work); + + mutex_lock(&host->thread_lock); + + mrq = host->mrq; + if (!mrq) { + dev_dbg(dev, "IRQ thread state %u, wait %u: NULL mrq!\n", + host->state, host->wait_for); + mutex_unlock(&host->thread_lock); + return IRQ_HANDLED; + } + + /* + * All handlers return true, if processing continues, and false, if the + * request has to be completed - successfully or not + */ + switch (wait_work) { + case MMCIF_WAIT_FOR_REQUEST: + /* We're too late, the timeout has already kicked in */ + mutex_unlock(&host->thread_lock); + return IRQ_HANDLED; + case MMCIF_WAIT_FOR_CMD: + /* Wait for data? */ + wait = sh_mmcif_end_cmd(host); + break; + case MMCIF_WAIT_FOR_MREAD: + /* Wait for more data? */ + wait = sh_mmcif_mread_block(host); + break; + case MMCIF_WAIT_FOR_READ: + /* Wait for data end? */ + wait = sh_mmcif_read_block(host); + break; + case MMCIF_WAIT_FOR_MWRITE: + /* Wait data to write? */ + wait = sh_mmcif_mwrite_block(host); + break; + case MMCIF_WAIT_FOR_WRITE: + /* Wait for data end? */ + wait = sh_mmcif_write_block(host); + break; + case MMCIF_WAIT_FOR_STOP: + if (host->sd_error) { + mrq->stop->error = sh_mmcif_error_manage(host); + dev_dbg(dev, "%s(): %d\n", __func__, mrq->stop->error); + break; + } + sh_mmcif_get_cmd12response(host, mrq->stop); + mrq->stop->error = 0; + break; + case MMCIF_WAIT_FOR_READ_END: + case MMCIF_WAIT_FOR_WRITE_END: + if (host->sd_error) { + mrq->data->error = sh_mmcif_error_manage(host); + dev_dbg(dev, "%s(): %d\n", __func__, mrq->data->error); + } + break; + default: + BUG(); + } + + if (wait) { + schedule_delayed_work(&host->timeout_work, host->timeout); + /* Wait for more data */ + mutex_unlock(&host->thread_lock); + return IRQ_HANDLED; + } + + if (host->wait_for != MMCIF_WAIT_FOR_STOP) { + struct mmc_data *data = mrq->data; + if (!mrq->cmd->error && data && !data->error) + data->bytes_xfered = + data->blocks * data->blksz; + + if (mrq->stop && !mrq->cmd->error && (!data || !data->error)) { + sh_mmcif_stop_cmd(host, mrq); + if (!mrq->stop->error) { + schedule_delayed_work(&host->timeout_work, host->timeout); + mutex_unlock(&host->thread_lock); + return IRQ_HANDLED; + } + } + } + + host->wait_for = MMCIF_WAIT_FOR_REQUEST; + host->state = STATE_IDLE; + host->mrq = NULL; + mmc_request_done(host->mmc, mrq); + + mutex_unlock(&host->thread_lock); + + return IRQ_HANDLED; +} + +static irqreturn_t sh_mmcif_intr(int irq, void *dev_id) +{ + struct sh_mmcif_host *host = dev_id; + struct device *dev = sh_mmcif_host_to_dev(host); + u32 state, mask; + + state = sh_mmcif_readl(host->addr, MMCIF_CE_INT); + mask = sh_mmcif_readl(host->addr, MMCIF_CE_INT_MASK); + if (host->ccs_enable) + sh_mmcif_writel(host->addr, MMCIF_CE_INT, ~(state & mask)); + else + sh_mmcif_writel(host->addr, MMCIF_CE_INT, INT_CCS | ~(state & mask)); + sh_mmcif_bitclr(host, MMCIF_CE_INT_MASK, state & MASK_CLEAN); + + if (state & ~MASK_CLEAN) + dev_dbg(dev, "IRQ state = 0x%08x incompletely cleared\n", + state); + + if (state & INT_ERR_STS || state & ~INT_ALL) { + host->sd_error = true; + dev_dbg(dev, "int err state = 0x%08x\n", state); + } + if (state & ~(INT_CMD12RBE | INT_CMD12CRE)) { + if (!host->mrq) + dev_dbg(dev, "NULL IRQ state = 0x%08x\n", state); + if (!host->dma_active) + return IRQ_WAKE_THREAD; + else if (host->sd_error) + sh_mmcif_dma_complete(host); + } else { + dev_dbg(dev, "Unexpected IRQ 0x%x\n", state); + } + + return IRQ_HANDLED; +} + +static void sh_mmcif_timeout_work(struct work_struct *work) +{ + struct delayed_work *d = to_delayed_work(work); + struct sh_mmcif_host *host = container_of(d, struct sh_mmcif_host, timeout_work); + struct mmc_request *mrq = host->mrq; + struct device *dev = sh_mmcif_host_to_dev(host); + unsigned long flags; + + if (host->dying) + /* Don't run after mmc_remove_host() */ + return; + + spin_lock_irqsave(&host->lock, flags); + if (host->state == STATE_IDLE) { + spin_unlock_irqrestore(&host->lock, flags); + return; + } + + dev_err(dev, "Timeout waiting for %u on CMD%u\n", + host->wait_for, mrq->cmd->opcode); + + host->state = STATE_TIMEOUT; + spin_unlock_irqrestore(&host->lock, flags); + + /* + * Handle races with cancel_delayed_work(), unless + * cancel_delayed_work_sync() is used + */ + switch (host->wait_for) { + case MMCIF_WAIT_FOR_CMD: + mrq->cmd->error = sh_mmcif_error_manage(host); + break; + case MMCIF_WAIT_FOR_STOP: + mrq->stop->error = sh_mmcif_error_manage(host); + break; + case MMCIF_WAIT_FOR_MREAD: + case MMCIF_WAIT_FOR_MWRITE: + case MMCIF_WAIT_FOR_READ: + case MMCIF_WAIT_FOR_WRITE: + case MMCIF_WAIT_FOR_READ_END: + case MMCIF_WAIT_FOR_WRITE_END: + mrq->data->error = sh_mmcif_error_manage(host); + break; + default: + BUG(); + } + + host->state = STATE_IDLE; + host->wait_for = MMCIF_WAIT_FOR_REQUEST; + host->mrq = NULL; + mmc_request_done(host->mmc, mrq); +} + +static void sh_mmcif_init_ocr(struct sh_mmcif_host *host) +{ + struct device *dev = sh_mmcif_host_to_dev(host); + struct sh_mmcif_plat_data *pd = dev->platform_data; + struct mmc_host *mmc = host->mmc; + + mmc_regulator_get_supply(mmc); + + if (!pd) + return; + + if (!mmc->ocr_avail) + mmc->ocr_avail = pd->ocr; + else if (pd->ocr) + dev_warn(mmc_dev(mmc), "Platform OCR mask is ignored\n"); +} + +static int sh_mmcif_probe(struct platform_device *pdev) +{ + int ret = 0, irq[2]; + struct mmc_host *mmc; + struct sh_mmcif_host *host; + struct device *dev = &pdev->dev; + struct sh_mmcif_plat_data *pd = dev->platform_data; + void __iomem *reg; + const char *name; + + irq[0] = platform_get_irq(pdev, 0); + irq[1] = platform_get_irq_optional(pdev, 1); + if (irq[0] < 0) + return irq[0]; + + reg = devm_platform_ioremap_resource(pdev, 0); + if (IS_ERR(reg)) + return PTR_ERR(reg); + + mmc = mmc_alloc_host(sizeof(struct sh_mmcif_host), dev); + if (!mmc) + return -ENOMEM; + + ret = mmc_of_parse(mmc); + if (ret < 0) + goto err_host; + + host = mmc_priv(mmc); + host->mmc = mmc; + host->addr = reg; + host->timeout = msecs_to_jiffies(10000); + host->ccs_enable = true; + host->clk_ctrl2_enable = false; + + host->pd = pdev; + + spin_lock_init(&host->lock); + + mmc->ops = &sh_mmcif_ops; + sh_mmcif_init_ocr(host); + + mmc->caps |= MMC_CAP_MMC_HIGHSPEED | MMC_CAP_WAIT_WHILE_BUSY; + mmc->caps2 |= MMC_CAP2_NO_SD | MMC_CAP2_NO_SDIO; + mmc->max_busy_timeout = 10000; + + if (pd && pd->caps) + mmc->caps |= pd->caps; + mmc->max_segs = 32; + mmc->max_blk_size = 512; + mmc->max_req_size = PAGE_SIZE * mmc->max_segs; + mmc->max_blk_count = mmc->max_req_size / mmc->max_blk_size; + mmc->max_seg_size = mmc->max_req_size; + + platform_set_drvdata(pdev, host); + + host->clk = devm_clk_get(dev, NULL); + if (IS_ERR(host->clk)) { + ret = PTR_ERR(host->clk); + dev_err(dev, "cannot get clock: %d\n", ret); + goto err_host; + } + + ret = clk_prepare_enable(host->clk); + if (ret < 0) + goto err_host; + + sh_mmcif_clk_setup(host); + + pm_runtime_enable(dev); + host->power = false; + + ret = pm_runtime_get_sync(dev); + if (ret < 0) + goto err_clk; + + INIT_DELAYED_WORK(&host->timeout_work, sh_mmcif_timeout_work); + + sh_mmcif_sync_reset(host); + sh_mmcif_writel(host->addr, MMCIF_CE_INT_MASK, MASK_ALL); + + name = irq[1] < 0 ? dev_name(dev) : "sh_mmc:error"; + ret = devm_request_threaded_irq(dev, irq[0], sh_mmcif_intr, + sh_mmcif_irqt, 0, name, host); + if (ret) { + dev_err(dev, "request_irq error (%s)\n", name); + goto err_clk; + } + if (irq[1] >= 0) { + ret = devm_request_threaded_irq(dev, irq[1], + sh_mmcif_intr, sh_mmcif_irqt, + 0, "sh_mmc:int", host); + if (ret) { + dev_err(dev, "request_irq error (sh_mmc:int)\n"); + goto err_clk; + } + } + + mutex_init(&host->thread_lock); + + ret = mmc_add_host(mmc); + if (ret < 0) + goto err_clk; + + dev_pm_qos_expose_latency_limit(dev, 100); + + dev_info(dev, "Chip version 0x%04x, clock rate %luMHz\n", + sh_mmcif_readl(host->addr, MMCIF_CE_VERSION) & 0xffff, + clk_get_rate(host->clk) / 1000000UL); + + pm_runtime_put(dev); + clk_disable_unprepare(host->clk); + return ret; + +err_clk: + clk_disable_unprepare(host->clk); + pm_runtime_put_sync(dev); + pm_runtime_disable(dev); +err_host: + mmc_free_host(mmc); + return ret; +} + +static int sh_mmcif_remove(struct platform_device *pdev) +{ + struct sh_mmcif_host *host = platform_get_drvdata(pdev); + + host->dying = true; + clk_prepare_enable(host->clk); + pm_runtime_get_sync(&pdev->dev); + + dev_pm_qos_hide_latency_limit(&pdev->dev); + + mmc_remove_host(host->mmc); + sh_mmcif_writel(host->addr, MMCIF_CE_INT_MASK, MASK_ALL); + + /* + * FIXME: cancel_delayed_work(_sync)() and free_irq() race with the + * mmc_remove_host() call above. But swapping order doesn't help either + * (a query on the linux-mmc mailing list didn't bring any replies). + */ + cancel_delayed_work_sync(&host->timeout_work); + + clk_disable_unprepare(host->clk); + mmc_free_host(host->mmc); + pm_runtime_put_sync(&pdev->dev); + pm_runtime_disable(&pdev->dev); + + return 0; +} + +#ifdef CONFIG_PM_SLEEP +static int sh_mmcif_suspend(struct device *dev) +{ + struct sh_mmcif_host *host = dev_get_drvdata(dev); + + pm_runtime_get_sync(dev); + sh_mmcif_writel(host->addr, MMCIF_CE_INT_MASK, MASK_ALL); + pm_runtime_put(dev); + + return 0; +} + +static int sh_mmcif_resume(struct device *dev) +{ + return 0; +} +#endif + +static const struct dev_pm_ops sh_mmcif_dev_pm_ops = { + SET_SYSTEM_SLEEP_PM_OPS(sh_mmcif_suspend, sh_mmcif_resume) +}; + +static struct platform_driver sh_mmcif_driver = { + .probe = sh_mmcif_probe, + .remove = sh_mmcif_remove, + .driver = { + .name = DRIVER_NAME, + .probe_type = PROBE_PREFER_ASYNCHRONOUS, + .pm = &sh_mmcif_dev_pm_ops, + .of_match_table = sh_mmcif_of_match, + }, +}; + +module_platform_driver(sh_mmcif_driver); + +MODULE_DESCRIPTION("SuperH on-chip MMC/eMMC interface driver"); +MODULE_LICENSE("GPL v2"); +MODULE_ALIAS("platform:" DRIVER_NAME); +MODULE_AUTHOR("Yusuke Goda <yusuke.goda.sx@renesas.com>"); |