ARM: MXC: mxcmmc: Teach the driver SDIO operations

Successfully tested on MX31 hardware using libertas SDIO peripherals.

Signed-off-by: Daniel Mack <daniel@caiaq.de>
Cc: Sascha Hauer <s.hauer@pengutronix.de>
Cc: Dan Williams <dan.j.williams@intel.com>
Cc: Volker Ernst <volker.ernst@txtr.com>
Cc: Jiri Kosina <jkosina@suse.cz>
Cc: Michał Mirosław <mirqus@gmail.com>
Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>

1 files changed, 59 insertions, 11 deletions

diff --git a/drivers/mmc/host/mxcmmc.c b/drivers/mmc/host/mxcmmc.c
index 44a53ee5e21..51e880c8f19 100644
--- a/drivers/mmc/host/mxcmmc.c
+++ b/drivers/mmc/host/mxcmmc.c
@@ -119,6 +119,7 @@ struct mxcmci_host {
         int                     detect_irq;
         int                     dma;
         int                     do_dma;
+        int                     use_sdio;
         unsigned int            power_mode;
         struct imxmmc_platform_data *pdata;
 
@@ -138,6 +139,7 @@ struct mxcmci_host {
         int                     clock;
 
         struct work_struct      datawork;
+        spinlock_t              lock;
 };
 
 static void mxcmci_set_clk_rate(struct mxcmci_host *host, unsigned int clk_ios);
@@ -226,6 +228,9 @@ static int mxcmci_setup_data(struct mxcmci_host *host, struct mmc_data *data)
 static int mxcmci_start_cmd(struct mxcmci_host *host, struct mmc_command *cmd,
                 unsigned int cmdat)
 {
+        u32 int_cntr;
+        unsigned long flags;
+
         WARN_ON(host->cmd != NULL);
         host->cmd = cmd;
 
@@ -249,12 +254,16 @@ static int mxcmci_start_cmd(struct mxcmci_host *host, struct mmc_command *cmd,
                 return -EINVAL;
         }
 
+        int_cntr = INT_END_CMD_RES_EN;
+
         if (mxcmci_use_dma(host))
-                writel(INT_READ_OP_EN | INT_WRITE_OP_DONE_EN |
-                                INT_END_CMD_RES_EN,
-                                host->base + MMC_REG_INT_CNTR);
-        else
-                writel(INT_END_CMD_RES_EN, host->base + MMC_REG_INT_CNTR);
+                int_cntr |= INT_READ_OP_EN | INT_WRITE_OP_DONE_EN;
+
+        spin_lock_irqsave(&host->lock, flags);
+        if (host->use_sdio)
+                int_cntr |= INT_SDIO_IRQ_EN;
+        writel(int_cntr, host->base + MMC_REG_INT_CNTR);
+        spin_unlock_irqrestore(&host->lock, flags);
 
         writew(cmd->opcode, host->base + MMC_REG_CMD);
         writel(cmd->arg, host->base + MMC_REG_ARG);
@@ -266,7 +275,14 @@ static int mxcmci_start_cmd(struct mxcmci_host *host, struct mmc_command *cmd,
 static void mxcmci_finish_request(struct mxcmci_host *host,
                 struct mmc_request *req)
 {
-        writel(0, host->base + MMC_REG_INT_CNTR);
+        u32 int_cntr = 0;
+        unsigned long flags;
+
+        spin_lock_irqsave(&host->lock, flags);
+        if (host->use_sdio)
+                int_cntr |= INT_SDIO_IRQ_EN;
+        writel(int_cntr, host->base + MMC_REG_INT_CNTR);
+        spin_unlock_irqrestore(&host->lock, flags);
 
         host->req = NULL;
         host->cmd = NULL;
@@ -532,15 +548,27 @@ static void mxcmci_cmd_done(struct mxcmci_host *host, unsigned int stat)
 static irqreturn_t mxcmci_irq(int irq, void *devid)
 {
         struct mxcmci_host *host = devid;
+        unsigned long flags;
+        bool sdio_irq;
         u32 stat;
 
         stat = readl(host->base + MMC_REG_STATUS);
-        writel(stat, host->base + MMC_REG_STATUS);
+        writel(stat & ~STATUS_SDIO_INT_ACTIVE, host->base + MMC_REG_STATUS);
 
         dev_dbg(mmc_dev(host->mmc), "%s: 0x%08x\n", __func__, stat);
 
+        spin_lock_irqsave(&host->lock, flags);
+        sdio_irq = (stat & STATUS_SDIO_INT_ACTIVE) && host->use_sdio;
+        spin_unlock_irqrestore(&host->lock, flags);
+
+        if (sdio_irq) {
+                writel(STATUS_SDIO_INT_ACTIVE, host->base + MMC_REG_STATUS);
+                mmc_signal_sdio_irq(host->mmc);
+        }
+
         if (stat & STATUS_END_CMD_RESP)
                 mxcmci_cmd_done(host, stat);
+
 #ifdef HAS_DMA
         if (mxcmci_use_dma(host) &&
                   (stat & (STATUS_DATA_TRANS_DONE | STATUS_WRITE_OP_DONE)))
@@ -677,11 +705,30 @@ static int mxcmci_get_ro(struct mmc_host *mmc)
         return -ENOSYS;
 }
 
+static void mxcmci_enable_sdio_irq(struct mmc_host *mmc, int enable)
+{
+        struct mxcmci_host *host = mmc_priv(mmc);
+        unsigned long flags;
+        u32 int_cntr;
+
+        spin_lock_irqsave(&host->lock, flags);
+        host->use_sdio = enable;
+        int_cntr = readl(host->base + MMC_REG_INT_CNTR);
+
+        if (enable)
+                int_cntr |= INT_SDIO_IRQ_EN;
+        else
+                int_cntr &= ~INT_SDIO_IRQ_EN;
+
+        writel(int_cntr, host->base + MMC_REG_INT_CNTR);
+        spin_unlock_irqrestore(&host->lock, flags);
+}
 
 static const struct mmc_host_ops mxcmci_ops = {
-        .request        = mxcmci_request,
-        .set_ios        = mxcmci_set_ios,
-        .get_ro         = mxcmci_get_ro,
+        .request                = mxcmci_request,
+        .set_ios                = mxcmci_set_ios,
+        .get_ro                 = mxcmci_get_ro,
+        .enable_sdio_irq        = mxcmci_enable_sdio_irq,
 };
 
 static int mxcmci_probe(struct platform_device *pdev)
@@ -709,7 +756,7 @@ static int mxcmci_probe(struct platform_device *pdev)
         }
 
         mmc->ops = &mxcmci_ops;
-        mmc->caps = MMC_CAP_4_BIT_DATA;
+        mmc->caps = MMC_CAP_4_BIT_DATA | MMC_CAP_SDIO_IRQ;
 
         /* MMC core transfer sizes tunable parameters */
         mmc->max_hw_segs = 64;
@@ -728,6 +775,7 @@ static int mxcmci_probe(struct platform_device *pdev)
 
         host->mmc = mmc;
         host->pdata = pdev->dev.platform_data;
+        spin_lock_init(&host->lock);
 
         if (host->pdata && host->pdata->ocr_avail)
                 mmc->ocr_avail = host->pdata->ocr_avail;