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authorKuninori Morimoto <kuninori.morimoto.gx@renesas.com>2015-01-13 05:00:07 +0000
committerUlf Hansson <ulf.hansson@linaro.org>2015-01-20 10:23:47 +0100
commitf45394d5ecd1cf3644a6f1ce7db39ab406ced0a6 (patch)
tree0e20060333b96a05fa7066531e4c797717b572d7 /drivers/mmc
parent0c47f6aebaba68517692863cbdd88e98e2574b1a (diff)
downloadkernel-f45394d5ecd1cf3644a6f1ce7db39ab406ced0a6.tar.gz
mmc: sh_mobile_sdhi: enable 32bit DMA access
Now, sh_mobile_sdhi can use 32bit DMA access in R-Cer Gen2. Let's use it. Signed-off-by: Kuninori Morimoto <kuninori.morimoto.gx@renesas.com> Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org>
Diffstat (limited to 'drivers/mmc')
-rw-r--r--drivers/mmc/host/sh_mobile_sdhi.c42
1 files changed, 33 insertions, 9 deletions
diff --git a/drivers/mmc/host/sh_mobile_sdhi.c b/drivers/mmc/host/sh_mobile_sdhi.c
index 40913299f3ba..7dbcb577f596 100644
--- a/drivers/mmc/host/sh_mobile_sdhi.c
+++ b/drivers/mmc/host/sh_mobile_sdhi.c
@@ -41,6 +41,7 @@ struct sh_mobile_sdhi_of_data {
unsigned long tmio_flags;
unsigned long capabilities;
unsigned long capabilities2;
+ enum dma_slave_buswidth dma_buswidth;
dma_addr_t dma_rx_offset;
};
@@ -60,6 +61,7 @@ static const struct sh_mobile_sdhi_of_data of_rcar_gen2_compatible = {
.tmio_flags = TMIO_MMC_HAS_IDLE_WAIT | TMIO_MMC_WRPROTECT_DISABLE |
TMIO_MMC_CLK_ACTUAL,
.capabilities = MMC_CAP_SD_HIGHSPEED | MMC_CAP_SDIO_IRQ,
+ .dma_buswidth = DMA_SLAVE_BUSWIDTH_4_BYTES,
.dma_rx_offset = 0x2000,
};
@@ -86,6 +88,29 @@ struct sh_mobile_sdhi {
struct tmio_mmc_dma dma_priv;
};
+static void sh_mobile_sdhi_sdbuf_width(struct tmio_mmc_host *host, int width)
+{
+ u32 val;
+
+ /*
+ * see also
+ * sh_mobile_sdhi_of_data :: dma_buswidth
+ */
+ switch (sd_ctrl_read16(host, CTL_VERSION)) {
+ case 0x490C:
+ val = (width == 32) ? 0x0001 : 0x0000;
+ break;
+ case 0xCB0D:
+ val = (width == 32) ? 0x0000 : 0x0001;
+ break;
+ default:
+ /* nothing to do */
+ return;
+ }
+
+ sd_ctrl_write16(host, EXT_ACC, val);
+}
+
static int sh_mobile_sdhi_clk_enable(struct platform_device *pdev, unsigned int *f)
{
struct mmc_host *mmc = platform_get_drvdata(pdev);
@@ -96,6 +121,10 @@ static int sh_mobile_sdhi_clk_enable(struct platform_device *pdev, unsigned int
return ret;
*f = clk_get_rate(priv->clk);
+
+ /* enable 16bit data access on SDBUF as default */
+ sh_mobile_sdhi_sdbuf_width(host, 16);
+
return 0;
}
@@ -161,6 +190,9 @@ static int sh_mobile_sdhi_multi_io_quirk(struct mmc_card *card,
static void sh_mobile_sdhi_enable_dma(struct tmio_mmc_host *host, bool enable)
{
sd_ctrl_write16(host, CTL_DMA_ENABLE, enable ? 2 : 0);
+
+ /* enable 32bit access if DMA mode if possibile */
+ sh_mobile_sdhi_sdbuf_width(host, enable ? 32 : 16);
}
static int sh_mobile_sdhi_probe(struct platform_device *pdev)
@@ -175,7 +207,6 @@ static int sh_mobile_sdhi_probe(struct platform_device *pdev)
int irq, ret, i = 0;
bool multiplexed_isr = true;
struct tmio_mmc_dma *dma_priv;
- u16 ver;
res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
if (!res)
@@ -271,6 +302,7 @@ static int sh_mobile_sdhi_probe(struct platform_device *pdev)
mmc_data->capabilities |= of_data->capabilities;
mmc_data->capabilities2 |= of_data->capabilities2;
mmc_data->dma_rx_offset = of_data->dma_rx_offset;
+ dma_priv->dma_buswidth = of_data->dma_buswidth;
}
ret = tmio_mmc_host_probe(host, mmc_data);
@@ -278,14 +310,6 @@ static int sh_mobile_sdhi_probe(struct platform_device *pdev)
goto efree;
/*
- * FIXME:
- * this Workaround can be more clever method
- */
- ver = sd_ctrl_read16(host, CTL_VERSION);
- if (ver == 0xCB0D)
- sd_ctrl_write16(host, EXT_ACC, 1);
-
- /*
* Allow one or more specific (named) ISRs or
* one or more multiplexed (un-named) ISRs.
*/