enable controller caps to support h/w clock gating
Signed-off-by: Philip Rakity <prakity@xxxxxxxxxxx>
---
drivers/mmc/host/sdhci-pxa.c | 34 +++++++++++++++++++++++++++++++++-
1 files changed, 33 insertions(+), 1 deletions(-)
diff --git a/drivers/mmc/host/sdhci-pxa.c b/drivers/mmc/host/sdhci-pxa.c
index 8527ac1..e736727 100644
--- a/drivers/mmc/host/sdhci-pxa.c
+++ b/drivers/mmc/host/sdhci-pxa.c
@@ -35,6 +35,7 @@
#define SDCLK_DELAY_SHIFT 9
#define SDCLK_SEL_SHIFT 8
+#define DISABLE_CLOCK_GATING 0
struct sdhci_pxa {
struct sdhci_host *host;
@@ -86,10 +87,25 @@ static void set_clock_and_burst_size(struct sdhci_host *host)
}
}
+static void programFIFO(struct sdhci_host *host, int enable)
+{
+ unsigned short tmp;
+
+ tmp = readw(host->ioaddr + SDHCI_HOST_CONTROL_2);
+
+ if (enable)
+ tmp |= SDCTRL_2_ASYNC_INT_EN;
+ else
+ tmp &= ~SDCTRL_2_ASYNC_INT_EN;
+
+ writew(tmp, host->ioaddr + SDHCI_HOST_CONTROL_2);
+}
+
static void platform_reset_exit(struct sdhci_host *host, u8 mask)
{
if (mask == SDHCI_RESET_ALL) {
/* reset private registers */
+ programFIFO(host, DISABLE_CLOCK_GATING);
set_clock_and_burst_size(host);
}
}
@@ -117,10 +133,23 @@ static unsigned int set_signaling_voltage(struct sdhci_host *host,
return 0;
}
+#ifdef CONFIG_MMC_CLKGATE
+static void platform_hw_clk_gate(struct sdhci_host *host)
+{
+ int enable;
+
+ enable = host->mmc->clk_gated;
+ programFIFO(host, enable);
+}
+#endif
+
static struct sdhci_ops sdhci_pxa_ops = {
.platform_reset_exit = platform_reset_exit,
.set_signaling_voltage = set_signaling_voltage,
.get_f_max_clock = NULL,
+#ifdef CONFIG_MMC_CLKGATE
+ .platform_hw_clk_gate = platform_hw_clk_gate,
+#endif
};
/*****************************************************************************\
@@ -194,8 +223,11 @@ static int __devinit sdhci_pxa_probe(struct platform_device *pdev)
if (pdata->quirks)
host->quirks |= pdata->quirks;
- /* enable mmc bus width testing */
+#ifdef CONFIG_MMC_CLKGATE
+ host->mmc->caps |= MMC_CAP_HW_CLOCK_GATING | MMC_CAP_BUS_WIDTH_TEST;
+#else
host->mmc->caps |= MMC_CAP_BUS_WIDTH_TEST;
+#endif
/* If slot design supports 8 bit data, indicate this to MMC. */
if (pdata->flags & PXA_FLAG_SD_8_BIT_CAPABLE_SLOT)
--
1.7.0.4
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