[U-Boot] [PATCH v2 1/7] mmc: sunxi: Configure reset support for DM_MMC

[Jagan Teki]

Start with Allwinner A31, mmc controllers do support reset
control bit. This code add support to enable the reset control
start from SUN6I even though it share same compatible between
SUN4I and SUN6I.

Signed-off-by: Jagan Teki <jagan at amarulasolutions.com>
---
 drivers/mmc/sunxi_mmc.c | 21 +++++++++++++++++++--
 1 file changed, 19 insertions(+), 2 deletions(-)

diff --git a/drivers/mmc/sunxi_mmc.c b/drivers/mmc/sunxi_mmc.c
index 302332bf97..0e53701c5b 100644
--- a/drivers/mmc/sunxi_mmc.c
+++ b/drivers/mmc/sunxi_mmc.c
@@ -21,8 +21,11 @@
 
 #ifdef CONFIG_DM_MMC
 struct sunxi_mmc_variant {
+	bool has_reset;
 	u16 gate_offset;
 	u16 mclk_offset;
+	u16 reset_offset;
+	u8 reset_start_bit;
 };
 #endif
 
@@ -609,7 +612,7 @@ static int sunxi_mmc_probe(struct udevice *dev)
 	struct sunxi_mmc_priv *priv = dev_get_priv(dev);
 	struct mmc_config *cfg = &plat->cfg;
 	struct ofnode_phandle_args args;
-	u32 *gate_reg, *ccu_reg;
+	u32 *gate_reg, *reset_reg, *ccu_reg;
 	int bus_width, ret;
 
 	cfg->name = dev->name;
@@ -644,6 +647,12 @@ static int sunxi_mmc_probe(struct udevice *dev)
 	gate_reg = (void *)ccu_reg + priv->variant->gate_offset;
 	setbits_le32(gate_reg, BIT(AHB_GATE_OFFSET_MMC(priv->mmc_no)));
 
+	if ((!IS_ENABLED(CONFIG_MACH_SUN7I)) && priv->variant->has_reset) {
+		reset_reg = (void *)ccu_reg + priv->variant->reset_offset;
+		setbits_le32(reset_reg, BIT(priv->mmc_no +
+			     priv->variant->reset_start_bit));
+	}
+
 	ret = mmc_set_mod_clk(priv, 24000000);
 	if (ret)
 		return ret;
@@ -680,6 +689,14 @@ static const struct sunxi_mmc_variant sun4i_a10_variant = {
 	.mclk_offset = 0x88,
 };
 
+static const struct sunxi_mmc_variant sun7i_a20_variant = {
+	.has_reset = true,
+	.gate_offset = 0x60,
+	.mclk_offset = 0x88,
+	.reset_offset = 0x2c0,
+	.reset_start_bit = 8,
+};
+
 static const struct udevice_id sunxi_mmc_ids[] = {
 	{
 	  .compatible = "allwinner,sun4i-a10-mmc",
@@ -691,7 +708,7 @@ static const struct udevice_id sunxi_mmc_ids[] = {
 	},
 	{
 	  .compatible = "allwinner,sun7i-a20-mmc",
-	  .data = (ulong)&sun4i_a10_variant,
+	  .data = (ulong)&sun7i_a20_variant,
 	},
 	{ /* sentinel */ }
 };
-- 
2.18.0.321.gffc6fa0e3