This patch adds little-endian mode support for little-endian host
controller. To indicate the little-endian mode, we could add
'little-endian' property in device tree node.
Signed-off-by: Yangbo Lu <yangbo.lu@xxxxxxxxxxxxx>
---
drivers/mmc/host/sdhci-pltfm.c | 12 ++++++-
drivers/mmc/host/sdhci-pltfm.h | 74 ++++++++++++++++++++++++++++++------------
2 files changed, 64 insertions(+), 22 deletions(-)
diff --git a/drivers/mmc/host/sdhci-pltfm.c b/drivers/mmc/host/sdhci-pltfm.c
index a207f5a..7ef1dcb 100644
--- a/drivers/mmc/host/sdhci-pltfm.c
+++ b/drivers/mmc/host/sdhci-pltfm.c
@@ -121,6 +121,8 @@ struct sdhci_host *sdhci_pltfm_init(struct platform_device *pdev,
size_t priv_size)
{
struct sdhci_host *host;
+ struct device_node *np = pdev->dev.of_node;
+ struct sdhci_pltfm_host *pltfm_host;
struct resource *iomem;
int ret;
@@ -141,6 +143,14 @@ struct sdhci_host *sdhci_pltfm_init(struct platform_device *pdev,
goto err;
}
+ pltfm_host = sdhci_priv(host);
+ pltfm_host->endian_mode = BIG_ENDIAN_MODE;
+
+#ifdef CONFIG_OF
+ if (of_get_property(np, "little-endian", NULL))
+ pltfm_host->endian_mode = LITTLE_ENDIAN_MODE;
+#endif /* CONFIG_OF */
+
host->hw_name = dev_name(&pdev->dev);
if (pdata && pdata->ops)
host->ops = pdata->ops;
@@ -224,7 +234,7 @@ int sdhci_pltfm_unregister(struct platform_device *pdev)
{
struct sdhci_host *host = platform_get_drvdata(pdev);
struct sdhci_pltfm_host *pltfm_host = sdhci_priv(host);
- int dead = (readl(host->ioaddr + SDHCI_INT_STATUS) == 0xffffffff);
+ int dead = (sdhci_readl(host, SDHCI_INT_STATUS) == 0xffffffff);
sdhci_remove_host(host, dead);
clk_disable_unprepare(pltfm_host->clk);
diff --git a/drivers/mmc/host/sdhci-pltfm.h b/drivers/mmc/host/sdhci-pltfm.h
index 04bc248..a8cf954 100644
--- a/drivers/mmc/host/sdhci-pltfm.h
+++ b/drivers/mmc/host/sdhci-pltfm.h
@@ -28,6 +28,10 @@ struct sdhci_pltfm_host {
/* migrate from sdhci_of_host */
unsigned int clock;
u16 xfer_mode_shadow;
+ enum endian_mode {
+ LITTLE_ENDIAN_MODE,
+ BIG_ENDIAN_MODE,
+ } endian_mode;
unsigned long private[0] ____cacheline_aligned;
};
@@ -37,33 +41,61 @@ struct sdhci_pltfm_host {
* These accessors are designed for big endian hosts doing I/O to
* little endian controllers incorporating a 32-bit hardware byte swapper.
*/
-static inline u32 sdhci_be32bs_readl(struct sdhci_host *host, int reg)
+static inline void sdhci_clrsetbits(struct sdhci_host *host, u32 mask,
+ u32 val, int reg)
{
- return in_be32(host->ioaddr + reg);
+ struct sdhci_pltfm_host *pltfm_host = sdhci_priv(host);
+ void __iomem *base = host->ioaddr + (reg & ~0x3);
+ u32 shift = (reg & 0x3) * 8;
+
+ if (pltfm_host->endian_mode == BIG_ENDIAN_MODE)
+ iowrite32be(((ioread32be(base) & ~(mask << shift)) |
+ (val << shift)), base);
+ else
+ iowrite32(((ioread32(base) & ~(mask << shift)) |
+ (val << shift)), base);
}
-static inline u16 sdhci_be32bs_readw(struct sdhci_host *host, int reg)
+static inline u32 sdhci_32bs_readl(struct sdhci_host *host, int reg)
{
- return in_be16(host->ioaddr + (reg ^ 0x2));
+ struct sdhci_pltfm_host *pltfm_host = sdhci_priv(host);
+
+ if (pltfm_host->endian_mode == BIG_ENDIAN_MODE)
+ return ioread32be(host->ioaddr + reg);
+ else
+ return ioread32(host->ioaddr + reg);
}
-static inline u8 sdhci_be32bs_readb(struct sdhci_host *host, int reg)
+static inline u16 sdhci_32bs_readw(struct sdhci_host *host, int reg)
{
- return in_8(host->ioaddr + (reg ^ 0x3));
+ struct sdhci_pltfm_host *pltfm_host = sdhci_priv(host);
+
+ if (pltfm_host->endian_mode == BIG_ENDIAN_MODE)
+ return ioread16be(host->ioaddr + (reg ^ 0x2));
+ else
+ return ioread16(host->ioaddr + (reg ^ 0x2));
}
-static inline void sdhci_be32bs_writel(struct sdhci_host *host,
- u32 val, int reg)
+static inline u8 sdhci_32bs_readb(struct sdhci_host *host, int reg)
{
- out_be32(host->ioaddr + reg, val);
+ return ioread8(host->ioaddr + (reg ^ 0x3));
}
-static inline void sdhci_be32bs_writew(struct sdhci_host *host,
+static inline void sdhci_32bs_writel(struct sdhci_host *host,
+ u32 val, int reg)
+{
+ struct sdhci_pltfm_host *pltfm_host = sdhci_priv(host);
+
+ if (pltfm_host->endian_mode == BIG_ENDIAN_MODE)
+ iowrite32be(val, host->ioaddr + reg);
+ else
+ iowrite32(val, host->ioaddr + reg);
+}
+
+static inline void sdhci_32bs_writew(struct sdhci_host *host,
u16 val, int reg)
{
struct sdhci_pltfm_host *pltfm_host = sdhci_priv(host);
- int base = reg & ~0x3;
- int shift = (reg & 0x2) * 8;
switch (reg) {
case SDHCI_TRANSFER_MODE:
@@ -74,20 +106,20 @@ static inline void sdhci_be32bs_writew(struct sdhci_host *host,
pltfm_host->xfer_mode_shadow = val;
return;
case SDHCI_COMMAND:
- sdhci_be32bs_writel(host,
- val << 16 | pltfm_host->xfer_mode_shadow,
- SDHCI_TRANSFER_MODE);
+ if (pltfm_host->endian_mode == BIG_ENDIAN_MODE)
+ iowrite32be(val << 16 | pltfm_host->xfer_mode_shadow,
+ host->ioaddr + SDHCI_TRANSFER_MODE);
+ else
+ iowrite32(val << 16 | pltfm_host->xfer_mode_shadow,
+ host->ioaddr + SDHCI_TRANSFER_MODE);
return;
}
- clrsetbits_be32(host->ioaddr + base, 0xffff << shift, val << shift);
+ sdhci_clrsetbits(host, 0xffff, val, reg);
}
-static inline void sdhci_be32bs_writeb(struct sdhci_host *host, u8 val, int reg)
+static inline void sdhci_32bs_writeb(struct sdhci_host *host, u8 val, int reg)
{
- int base = reg & ~0x3;
- int shift = (reg & 0x3) * 8;
-
- clrsetbits_be32(host->ioaddr + base , 0xff << shift, val << shift);
+ sdhci_clrsetbits(host, 0xff, val, reg);
}
#endif /* CONFIG_MMC_SDHCI_BIG_ENDIAN_32BIT_BYTE_SWAPPER */
--
2.1.0.27.g96db324
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