[PATCH] OMAP35xx:SDIO IRQ Support for OMAP35xx

Phaneendra Kumar Alapati
2009-12-21T13:04:06Z

This patch adds SDIO IRQ support for OMAP35xx. Tested on OMAP3530EVM
with Marvell 88W8686 card and below are the observed throughput results
(ttcp utility): 13Mbps (Downlink), 10.5 Mbps(Uplink)

Signed-off-by: Phaneendra Kumar <phani@embwise.com>
---
drivers/mmc/host/omap_hsmmc.c | 55 ++++++++++++++++++++++++++++++++++++----
1 files changed, 49 insertions(+), 6 deletions(-)

diff --git a/drivers/mmc/host/omap_hsmmc.c b/drivers/mmc/host/omap_hsmmc.c
index 4b23225..fa94580 100644
--- a/drivers/mmc/host/omap_hsmmc.c
+++ b/drivers/mmc/host/omap_hsmmc.c
@@ -100,6 +100,10 @@
#define SRD (1 << 26)
#define SOFTRESET (1 << 1)
#define RESETDONE (1 << 0)
+#define CIRQ (1 << 8)
+#define CIRQ_ENABLE (1 << 8)
+#define CTPL (1 << 11)
+#define CLKEXTFREE (1 << 16)

/*
* FIXME: Most likely all the data using these _DEVID defines should come
@@ -171,6 +175,7 @@ struct omap_hsmmc_host {
int vdd;
int protect_card;
int reqs_blocked;
+ int sdio_int;

struct omap_mmc_platform_data *pdata;
};
@@ -436,6 +441,13 @@ omap_hsmmc_start_command(struct omap_hsmmc_host *host, struct mmc_command *cmd,
else
OMAP_HSMMC_WRITE(host->base, IE, INT_EN_MASK);

+ if (host->sdio_int) {
+ OMAP_HSMMC_WRITE(host->base, ISE,
+ (OMAP_HSMMC_READ(host->base, ISE) | CIRQ_ENABLE));
+ OMAP_HSMMC_WRITE(host->base, IE,
+ (OMAP_HSMMC_READ(host->base, IE) | CIRQ_ENABLE));
+ }
+
host->response_busy = 0;
if (cmd->flags & MMC_RSP_PRESENT) {
if (cmd->flags & MMC_RSP_136)
@@ -640,6 +652,17 @@ static irqreturn_t omap_hsmmc_irq(int irq, void *dev_id)

spin_lock(&host->irq_lock);

+ data = host->data;
+ status = OMAP_HSMMC_READ(host->base, STAT);
+ dev_dbg(mmc_dev(host->mmc), "IRQ Status is %x\n", status);
+
+ if (host->mmc->caps & MMC_CAP_SDIO_IRQ) {
+ if (status & CIRQ) {
+ dev_dbg(mmc_dev(host->mmc), "SDIO Card Interrupt\n");
+ mmc_signal_sdio_irq(host->mmc);
+ }
+ }
+
if (host->mrq == NULL) {
OMAP_HSMMC_WRITE(host->base, STAT,
OMAP_HSMMC_READ(host->base, STAT));
@@ -649,10 +672,6 @@ static irqreturn_t omap_hsmmc_irq(int irq, void *dev_id)
return IRQ_HANDLED;
}

- data = host->data;
- status = OMAP_HSMMC_READ(host->base, STAT);
- dev_dbg(mmc_dev(host->mmc), "IRQ Status is %x\n", status);
-
if (status & ERR) {
#ifdef CONFIG_MMC_DEBUG
omap_hsmmc_report_irq(host, status);
@@ -1254,6 +1273,25 @@ static int omap_hsmmc_get_ro(struct mmc_host *mmc)
return mmc_slot(host).get_ro(host->dev, 0);
}

+static void omap_hsmmc_enable_sdio_irq(struct mmc_host *mmc, int enable)
+{
+ struct omap_hsmmc_host *host = mmc_priv(mmc);
+
+ host->sdio_int = enable;
+ if (enable) {
+ OMAP_HSMMC_WRITE(host->base, ISE,
+ (OMAP_HSMMC_READ(host->base, ISE) | CIRQ_ENABLE));
+ OMAP_HSMMC_WRITE(host->base, IE,
+ (OMAP_HSMMC_READ(host->base, IE) | CIRQ_ENABLE));
+ } else {
+ OMAP_HSMMC_WRITE(host->base, IE,
+ (OMAP_HSMMC_READ(host->base, IE) & (~CIRQ_ENABLE)));
+ OMAP_HSMMC_WRITE(host->base, ISE,
+ (OMAP_HSMMC_READ(host->base, ISE) & (~CIRQ_ENABLE)));
+ }
+
+}
+
static void omap_hsmmc_conf_bus_power(struct omap_hsmmc_host *host)
{
u32 hctl, capa, value;
@@ -1519,7 +1557,7 @@ static const struct mmc_host_ops omap_hsmmc_ops = {
.set_ios = omap_hsmmc_set_ios,
.get_cd = omap_hsmmc_get_cd,
.get_ro = omap_hsmmc_get_ro,
- /* NYET -- enable_sdio_irq */
+ .enable_sdio_irq = omap_hsmmc_enable_sdio_irq,
};

static const struct mmc_host_ops omap_hsmmc_ps_ops = {
@@ -1529,7 +1567,7 @@ static const struct mmc_host_ops omap_hsmmc_ps_ops = {
.set_ios = omap_hsmmc_set_ios,
.get_cd = omap_hsmmc_get_cd,
.get_ro = omap_hsmmc_get_ro,
- /* NYET -- enable_sdio_irq */
+ .enable_sdio_irq = omap_hsmmc_enable_sdio_irq,
};

#ifdef CONFIG_DEBUG_FS
@@ -1657,6 +1695,7 @@ static int __init omap_hsmmc_probe(struct platform_device *pdev)
host->mapbase = res->start;
host->base = ioremap(host->mapbase, SZ_4K);
host->power_mode = -1;
+ host->sdio_int = 0;

platform_set_drvdata(pdev, host);
INIT_WORK(&host->mmc_carddetect_work, omap_hsmmc_detect);
@@ -1744,6 +1783,10 @@ static int __init omap_hsmmc_probe(struct platform_device *pdev)
if (mmc_slot(host).nonremovable)
mmc->caps |= MMC_CAP_NONREMOVABLE;

+ mmc->caps |= MMC_CAP_SDIO_IRQ;
+ OMAP_HSMMC_WRITE(host->base, CON,
+ OMAP_HSMMC_READ(host->base, CON) | (CTPL | CLKEXTFREE));
+
omap_hsmmc_conf_bus_power(host);

/* Select DMA lines */
--
1.6.3.3