mmc: sdhci-s3c: add platform_8bit_width() hook
We have 8-bit width support but is not a v3 controller.
So we need platform_8bit_width() to support 8-bit buswidth.
Also we need MMC_CAP_8_BIT_DATA, so we add it in platdata.
This gets 8-bit support working again on s3c, after we previously
disabled 8-bit by default on non-v3 controllers.
Signed-off-by: Jaehoon Chung <jh80.chung@samsung.com>
Signed-off-by: Kyungmin Park <kyungmin.park@samsung.com>
Signed-off-by: Chris Ball <cjb@laptop.org>
diff --git a/drivers/mmc/host/sdhci-s3c.c b/drivers/mmc/host/sdhci-s3c.c
index 1720358..5309ab9 100644
--- a/drivers/mmc/host/sdhci-s3c.c
+++ b/drivers/mmc/host/sdhci-s3c.c
@@ -277,10 +277,43 @@
host->clock = clock;
}
+/**
+ * sdhci_s3c_platform_8bit_width - support 8bit buswidth
+ * @host: The SDHCI host being queried
+ * @width: MMC_BUS_WIDTH_ macro for the bus width being requested
+ *
+ * We have 8-bit width support but is not a v3 controller.
+ * So we add platform_8bit_width() and support 8bit width.
+ */
+static int sdhci_s3c_platform_8bit_width(struct sdhci_host *host, int width)
+{
+ u8 ctrl;
+
+ ctrl = sdhci_readb(host, SDHCI_HOST_CONTROL);
+
+ switch (width) {
+ case MMC_BUS_WIDTH_8:
+ ctrl |= SDHCI_CTRL_8BITBUS;
+ ctrl &= ~SDHCI_CTRL_4BITBUS;
+ break;
+ case MMC_BUS_WIDTH_4:
+ ctrl |= SDHCI_CTRL_4BITBUS;
+ ctrl &= ~SDHCI_CTRL_8BITBUS;
+ break;
+ default:
+ break;
+ }
+
+ sdhci_writeb(host, ctrl, SDHCI_HOST_CONTROL);
+
+ return 0;
+}
+
static struct sdhci_ops sdhci_s3c_ops = {
.get_max_clock = sdhci_s3c_get_max_clk,
.set_clock = sdhci_s3c_set_clock,
.get_min_clock = sdhci_s3c_get_min_clock,
+ .platform_8bit_width = sdhci_s3c_platform_8bit_width,
};
static void sdhci_s3c_notify_change(struct platform_device *dev, int state)
@@ -473,6 +506,9 @@
if (pdata->cd_type == S3C_SDHCI_CD_PERMANENT)
host->mmc->caps = MMC_CAP_NONREMOVABLE;
+ if (pdata->host_caps)
+ host->mmc->caps |= pdata->host_caps;
+
host->quirks |= (SDHCI_QUIRK_32BIT_DMA_ADDR |
SDHCI_QUIRK_32BIT_DMA_SIZE);