[34/92] ram: rk3399: Add phy pctrl reset support
diff mbox series

Message ID 20190611145135.21399-35-jagan@amarulasolutions.com
State New
Headers show
Series
  • ram: rk3399: Add LPDDR4 support
Related show

Commit Message

Jagan Teki June 11, 2019, 2:50 p.m. UTC
Add support for phy pctrl reset support for both channel 0, 1.

Signed-off-by: Jagan Teki <jagan@amarulasolutions.com>
Signed-off-by: YouMin Chen <cym@rock-chips.com>
---
 drivers/ram/rockchip/sdram_rk3399.c | 29 +++++++++++++++++++++++++++++
 1 file changed, 29 insertions(+)

Patch
diff mbox series

diff --git a/drivers/ram/rockchip/sdram_rk3399.c b/drivers/ram/rockchip/sdram_rk3399.c
index e3945feca3..bbf56f29ae 100644
--- a/drivers/ram/rockchip/sdram_rk3399.c
+++ b/drivers/ram/rockchip/sdram_rk3399.c
@@ -35,6 +35,10 @@ 
 #define PHY_DRV_ODT_40		0xe
 #define PHY_DRV_ODT_34_3	0xf
 
+#define CRU_SFTRST_DDR_CTRL(ch, n)	((0x1 << (8 + 16 + (ch) * 4)) | \
+					((n) << (8 + (ch) * 4)))
+#define CRU_SFTRST_DDR_PHY(ch, n)	((0x1 << (9 + 16 + (ch) * 4)) | \
+					((n) << (9 + (ch) * 4)))
 struct chan_info {
 	struct rk3399_ddr_pctl_regs *pctl;
 	struct rk3399_ddr_pi_regs *pi;
@@ -79,6 +83,29 @@  static void copy_to_reg(u32 *dest, const u32 *src, u32 n)
 	}
 }
 
+static void rkclk_ddr_reset(struct rk3399_cru *cru, u32 channel, u32 ctl,
+			    u32 phy)
+{
+	channel &= 0x1;
+	ctl &= 0x1;
+	phy &= 0x1;
+	writel(CRU_SFTRST_DDR_CTRL(channel, ctl) |
+				   CRU_SFTRST_DDR_PHY(channel, phy),
+				   &cru->softrst_con[4]);
+}
+
+static void phy_pctrl_reset(struct rk3399_cru *cru,  u32 channel)
+{
+	rkclk_ddr_reset(cru, channel, 1, 1);
+	udelay(10);
+
+	rkclk_ddr_reset(cru, channel, 1, 0);
+	udelay(10);
+
+	rkclk_ddr_reset(cru, channel, 0, 0);
+	udelay(10);
+}
+
 static void phy_dll_bypass_set(struct rk3399_ddr_publ_regs *ddr_publ_regs,
 			       u32 freq)
 {
@@ -1126,6 +1153,7 @@  static int sdram_init(struct dram_info *dram,
 {
 	unsigned char dramtype = sdram_params->base.dramtype;
 	unsigned int ddr_freq = sdram_params->base.ddr_freq;
+	struct rk3399_cru *cru = dram->cru;
 	int channel;
 	int ret;
 
@@ -1142,6 +1170,7 @@  static int sdram_init(struct dram_info *dram,
 		const struct chan_info *chan = &dram->chan[channel];
 		struct rk3399_ddr_publ_regs *publ = chan->publ;
 
+		phy_pctrl_reset(cru, channel);
 		phy_dll_bypass_set(publ, ddr_freq);
 
 		if (channel >= sdram_params->base.num_channels)