diff options
| -rw-r--r-- | drivers/mmc/host/tmio_mmc.c | 79 | ||||
| -rw-r--r-- | include/linux/mfd/tmio.h | 4 |
2 files changed, 83 insertions, 0 deletions
diff --git a/drivers/mmc/host/tmio_mmc.c b/drivers/mmc/host/tmio_mmc.c index f442c8205b0a..81bed310ddcd 100644 --- a/drivers/mmc/host/tmio_mmc.c +++ b/drivers/mmc/host/tmio_mmc.c @@ -53,6 +53,8 @@ #define CTL_SD_ERROR_DETAIL_STATUS 0x2c #define CTL_SD_DATA_PORT 0x30 #define CTL_TRANSACTION_CTL 0x34 +#define CTL_SDIO_STATUS 0x36 +#define CTL_SDIO_IRQ_MASK 0x38 #define CTL_RESET_SD 0xe0 #define CTL_SDIO_REGS 0x100 #define CTL_CLK_AND_WAIT_CTL 0x138 @@ -81,6 +83,12 @@ #define TMIO_STAT_CMD_BUSY 0x40000000 #define TMIO_STAT_ILL_ACCESS 0x80000000 +/* Definitions for values the CTRL_SDIO_STATUS register can take. */ +#define TMIO_SDIO_STAT_IOIRQ 0x0001 +#define TMIO_SDIO_STAT_EXPUB52 0x4000 +#define TMIO_SDIO_STAT_EXWT 0x8000 +#define TMIO_SDIO_MASK_ALL 0xc007 + /* Define some IRQ masks */ /* This is the mask used at reset by the chip */ #define TMIO_MASK_ALL 0x837f031d @@ -122,6 +130,7 @@ struct tmio_mmc_host { struct mmc_data *data; struct mmc_host *mmc; int irq; + unsigned int sdio_irq_enabled; /* Callbacks for clock / power control */ void (*set_pwr)(struct platform_device *host, int state); @@ -249,6 +258,22 @@ void pr_debug_status(u32 status) #define pr_debug_status(s) do { } while (0) #endif +static void tmio_mmc_enable_sdio_irq(struct mmc_host *mmc, int enable) +{ + struct tmio_mmc_host *host = mmc_priv(mmc); + + if (enable) { + host->sdio_irq_enabled = 1; + sd_ctrl_write16(host, CTL_TRANSACTION_CTL, 0x0001); + sd_ctrl_write16(host, CTL_SDIO_IRQ_MASK, + (TMIO_SDIO_MASK_ALL & ~TMIO_SDIO_STAT_IOIRQ)); + } else { + sd_ctrl_write16(host, CTL_SDIO_IRQ_MASK, TMIO_SDIO_MASK_ALL); + sd_ctrl_write16(host, CTL_TRANSACTION_CTL, 0x0000); + host->sdio_irq_enabled = 0; + } +} + static void tmio_mmc_set_clock(struct tmio_mmc_host *host, int new_clock) { u32 clk = 0, clock; @@ -268,8 +293,23 @@ static void tmio_mmc_set_clock(struct tmio_mmc_host *host, int new_clock) static void tmio_mmc_clk_stop(struct tmio_mmc_host *host) { + struct mfd_cell *cell = host->pdev->dev.platform_data; + struct tmio_mmc_data *pdata = cell->driver_data; + + /* + * Testing on sh-mobile showed that SDIO IRQs are unmasked when + * CTL_CLK_AND_WAIT_CTL gets written, so we have to disable the + * device IRQ here and restore the SDIO IRQ mask before + * re-enabling the device IRQ. + */ + if (pdata->flags & TMIO_MMC_SDIO_IRQ) + disable_irq(host->irq); sd_ctrl_write16(host, CTL_CLK_AND_WAIT_CTL, 0x0000); msleep(10); + if (pdata->flags & TMIO_MMC_SDIO_IRQ) { + tmio_mmc_enable_sdio_irq(host->mmc, host->sdio_irq_enabled); + enable_irq(host->irq); + } sd_ctrl_write16(host, CTL_SD_CARD_CLK_CTL, ~0x0100 & sd_ctrl_read16(host, CTL_SD_CARD_CLK_CTL)); msleep(10); @@ -277,11 +317,21 @@ static void tmio_mmc_clk_stop(struct tmio_mmc_host *host) static void tmio_mmc_clk_start(struct tmio_mmc_host *host) { + struct mfd_cell *cell = host->pdev->dev.platform_data; + struct tmio_mmc_data *pdata = cell->driver_data; + sd_ctrl_write16(host, CTL_SD_CARD_CLK_CTL, 0x0100 | sd_ctrl_read16(host, CTL_SD_CARD_CLK_CTL)); msleep(10); + /* see comment in tmio_mmc_clk_stop above */ + if (pdata->flags & TMIO_MMC_SDIO_IRQ) + disable_irq(host->irq); sd_ctrl_write16(host, CTL_CLK_AND_WAIT_CTL, 0x0100); msleep(10); + if (pdata->flags & TMIO_MMC_SDIO_IRQ) { + tmio_mmc_enable_sdio_irq(host->mmc, host->sdio_irq_enabled); + enable_irq(host->irq); + } } static void reset(struct tmio_mmc_host *host) @@ -554,7 +604,10 @@ static void tmio_mmc_cmd_irq(struct tmio_mmc_host *host, static irqreturn_t tmio_mmc_irq(int irq, void *devid) { struct tmio_mmc_host *host = devid; + struct mfd_cell *cell = host->pdev->dev.platform_data; + struct tmio_mmc_data *pdata = cell->driver_data; unsigned int ireg, irq_mask, status; + unsigned int sdio_ireg, sdio_irq_mask, sdio_status; pr_debug("MMC IRQ begin\n"); @@ -562,6 +615,29 @@ static irqreturn_t tmio_mmc_irq(int irq, void *devid) irq_mask = sd_ctrl_read32(host, CTL_IRQ_MASK); ireg = status & TMIO_MASK_IRQ & ~irq_mask; + sdio_ireg = 0; + if (!ireg && pdata->flags & TMIO_MMC_SDIO_IRQ) { + sdio_status = sd_ctrl_read16(host, CTL_SDIO_STATUS); + sdio_irq_mask = sd_ctrl_read16(host, CTL_SDIO_IRQ_MASK); + sdio_ireg = sdio_status & TMIO_SDIO_MASK_ALL & ~sdio_irq_mask; + + sd_ctrl_write16(host, CTL_SDIO_STATUS, sdio_status & ~TMIO_SDIO_MASK_ALL); + + if (sdio_ireg && !host->sdio_irq_enabled) { + pr_warning("tmio_mmc: Spurious SDIO IRQ, disabling! 0x%04x 0x%04x 0x%04x\n", + sdio_status, sdio_irq_mask, sdio_ireg); + tmio_mmc_enable_sdio_irq(host->mmc, 0); + goto out; + } + + if (host->mmc->caps & MMC_CAP_SDIO_IRQ && + sdio_ireg & TMIO_SDIO_STAT_IOIRQ) + mmc_signal_sdio_irq(host->mmc); + + if (sdio_ireg) + goto out; + } + pr_debug_status(status); pr_debug_status(ireg); @@ -1047,6 +1123,7 @@ static const struct mmc_host_ops tmio_mmc_ops = { .set_ios = tmio_mmc_set_ios, .get_ro = tmio_mmc_get_ro, .get_cd = tmio_mmc_get_cd, + .enable_sdio_irq = tmio_mmc_enable_sdio_irq, }; #ifdef CONFIG_PM @@ -1162,6 +1239,8 @@ static int __devinit tmio_mmc_probe(struct platform_device *dev) goto cell_disable; disable_mmc_irqs(host, TMIO_MASK_ALL); + if (pdata->flags & TMIO_MMC_SDIO_IRQ) + tmio_mmc_enable_sdio_irq(mmc, 0); ret = request_irq(host->irq, tmio_mmc_irq, IRQF_DISABLED | IRQF_TRIGGER_FALLING, dev_name(&dev->dev), host); diff --git a/include/linux/mfd/tmio.h b/include/linux/mfd/tmio.h index dbfc053b1f95..8e70310ee945 100644 --- a/include/linux/mfd/tmio.h +++ b/include/linux/mfd/tmio.h @@ -57,6 +57,10 @@ * is configured in 4-bit mode. */ #define TMIO_MMC_BLKSZ_2BYTES (1 << 1) +/* + * Some controllers can support SDIO IRQ signalling. + */ +#define TMIO_MMC_SDIO_IRQ (1 << 2) int tmio_core_mmc_enable(void __iomem *cnf, int shift, unsigned long base); int tmio_core_mmc_resume(void __iomem *cnf, int shift, unsigned long base); |