This patch implements SDIO IRQ support for mfds which
announce the MMC_CAP_SDIO_IRQ capability for tmio_mmc.
Tested with a b43-based wireless SDIO card and sh_mobile_sdhi.
This patch applies on top of:
mmc: tmio_mmc: allow multi-element scatter-gather lists
mmc: tmio_mmc: fix PIO fallback on DMA descriptor allocation failure
mmc: tmio: merge the private header into the driver
mmc: tmio: implement a bounce buffer for unaligned DMA
Signed-off-by: Arnd Hannemann <arnd@xxxxxxxxxx>
CC: Ian Molton <ian@xxxxxxxxxxxxxx>
CC: Samuel Ortiz <sameo@xxxxxxxxxxxxxxx>
CC: Guennadi Liakhovetski <g.liakhovetski@xxxxxx>
---
drivers/mmc/host/tmio_mmc.c | 54 ++++++++++++++++++++++++++++++++++++++++++-
1 files changed, 53 insertions(+), 1 deletions(-)
diff --git a/drivers/mmc/host/tmio_mmc.c b/drivers/mmc/host/tmio_mmc.c
index 57ece9d..dbb1105 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);
@@ -247,6 +256,22 @@ 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;
@@ -279,6 +304,9 @@ static void tmio_mmc_clk_start(struct tmio_mmc_host *host)
sd_ctrl_read16(host, CTL_SD_CARD_CLK_CTL));
msleep(10);
sd_ctrl_write16(host, CTL_CLK_AND_WAIT_CTL, 0x0100);
+ /* restore sdio irq state */
+ if (host->mmc->caps & MMC_CAP_SDIO_IRQ)
+ tmio_mmc_enable_sdio_irq(host->mmc, host->sdio_irq_enabled);
msleep(10);
}
@@ -557,6 +585,7 @@ static irqreturn_t tmio_mmc_irq(int irq, void *devid)
{
struct tmio_mmc_host *host = devid;
unsigned int ireg, irq_mask, status;
+ unsigned int sdio_ireg, sdio_irq_mask, sdio_status;
pr_debug("MMC IRQ begin\n");
@@ -564,10 +593,30 @@ 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 (host->mmc->caps & MMC_CAP_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;
+
+ if (sdio_ireg || (!ireg && !host->sdio_irq_enabled))
+ pr_debug("%s: sdio_i=0x%04x sdio_s=0x%04x "
+ "mask=0x%04x ireg=0x%08x spur=%u\n",
+ mmc_hostname(host->mmc),
+ sdio_ireg, sdio_status, sdio_irq_mask, ireg,
+ !ireg && !host->sdio_irq_enabled);
+
+ /* ack all sdio interrupts... */
+ sd_ctrl_write16(host, CTL_SDIO_STATUS, sdio_status & ~TMIO_SDIO_MASK_ALL);
+
+ if (sdio_ireg & TMIO_SDIO_STAT_IOIRQ)
+ mmc_signal_sdio_irq(host->mmc);
+ }
+
pr_debug_status(status);
pr_debug_status(ireg);
- if (!ireg) {
+ if (!ireg && !sdio_ireg) {
disable_mmc_irqs(host, status & ~irq_mask);
pr_warning("tmio_mmc: Spurious irq, disabling! "
@@ -1033,6 +1082,7 @@ 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
@@ -1147,6 +1197,8 @@ static int __devinit tmio_mmc_probe(struct platform_device *dev)
goto cell_disable;
disable_mmc_irqs(host, TMIO_MASK_ALL);
+ if (mmc->caps & MMC_CAP_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);
--
1.7.0.4
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