[PATCH 1/5] clk: rockchip: rk3368: Add bus clk get/set

[WeiHao Li]

Some of board need operate PMIC like RK808-B for power supply. It's
depends on I2C peripheral, this patch add bus clock get/set function
which include I2C clock support.

This patch get form Rockchip downstream uboot repository.

Link: https://github.com/rockchip-linux/u-boot

Signed-off-by: WeiHao Li <cn.liweihao at gmail.com>
---
 .../include/asm/arch-rockchip/cru_rk3368.h    | 12 +++
 drivers/clk/rockchip/clk_rk3368.c             | 94 +++++++++++++++++++
 2 files changed, 106 insertions(+)

diff --git a/arch/arm/include/asm/arch-rockchip/cru_rk3368.h b/arch/arm/include/asm/arch-rockchip/cru_rk3368.h
index ed2a61218..845113f13 100644
--- a/arch/arm/include/asm/arch-rockchip/cru_rk3368.h
+++ b/arch/arm/include/asm/arch-rockchip/cru_rk3368.h
@@ -80,6 +80,18 @@ enum {
 	PLL_RESET			= 1,
 	PLL_RESET_MASK			= GENMASK(5, 5),
 
+	/* CLKSEL8CON */
+	PCLK_BUS_DIV_CON_SHIFT		= 12,
+	PCLK_BUS_DIV_CON_MASK		= 0x7 << PCLK_BUS_DIV_CON_SHIFT,
+	HCLK_BUS_DIV_CON_SHIFT		= 8,
+	HCLK_BUS_DIV_CON_MASK		= 0x3 << HCLK_BUS_DIV_CON_SHIFT,
+	CLK_BUS_PLL_SEL_CPLL		= 0,
+	CLK_BUS_PLL_SEL_GPLL		= 1,
+	CLK_BUS_PLL_SEL_SHIFT		= 7,
+	CLK_BUS_PLL_SEL_MASK		= 1 << CLK_BUS_PLL_SEL_SHIFT,
+	ACLK_BUS_DIV_CON_SHIFT		= 0,
+	ACLK_BUS_DIV_CON_MASK		= 0x1f << ACLK_BUS_DIV_CON_SHIFT,
+
 	/* CLKSEL12_CON */
 	MCU_STCLK_DIV_SHIFT		= 8,
 	MCU_STCLK_DIV_MASK		= GENMASK(10, 8),
diff --git a/drivers/clk/rockchip/clk_rk3368.c b/drivers/clk/rockchip/clk_rk3368.c
index 630253fbb..994330162 100644
--- a/drivers/clk/rockchip/clk_rk3368.c
+++ b/drivers/clk/rockchip/clk_rk3368.c
@@ -453,6 +453,82 @@ static ulong rk3368_saradc_set_clk(struct rk3368_cru *cru, uint hz)
 	return rk3368_saradc_get_clk(cru);
 }
 
+#if !IS_ENABLED(CONFIG_XPL_BUILD)
+static ulong rk3368_bus_get_clk(struct rk3368_cru *cru, ulong clk_id)
+{
+	u32 div, con, parent;
+
+	switch (clk_id) {
+	case ACLK_BUS:
+		con = readl(&cru->clksel_con[8]);
+		div = (con & ACLK_BUS_DIV_CON_MASK) >> ACLK_BUS_DIV_CON_SHIFT;
+		parent = rkclk_pll_get_rate(cru, GPLL);
+		break;
+	case HCLK_BUS:
+		con = readl(&cru->clksel_con[8]);
+		div = (con & HCLK_BUS_DIV_CON_MASK) >> HCLK_BUS_DIV_CON_SHIFT;
+		parent = rk3368_bus_get_clk(cru, ACLK_BUS);
+		break;
+	case PCLK_BUS:
+	case PCLK_PWM0:
+	case PCLK_PWM1:
+	case PCLK_I2C0:
+	case PCLK_I2C1:
+		con = readl(&cru->clksel_con[8]);
+		div = (con & PCLK_BUS_DIV_CON_MASK) >> PCLK_BUS_DIV_CON_SHIFT;
+		parent = rk3368_bus_get_clk(cru, ACLK_BUS);
+		break;
+	default:
+		return -ENOENT;
+	}
+
+	return DIV_TO_RATE(parent, div);
+}
+
+static ulong rk3368_bus_set_clk(struct rk3368_cru *cru,
+				ulong clk_id, ulong hz)
+{
+	int src_clk_div;
+
+	/*
+	 * select gpll as pd_bus bus clock source and
+	 * set up dependent divisors for PCLK/HCLK and ACLK clocks.
+	 */
+	switch (clk_id) {
+	case ACLK_BUS:
+		src_clk_div = DIV_ROUND_UP(rkclk_pll_get_rate(cru, GPLL), hz);
+		assert(src_clk_div - 1 < 31);
+		rk_clrsetreg(&cru->clksel_con[8],
+			     CLK_BUS_PLL_SEL_MASK | ACLK_BUS_DIV_CON_MASK,
+			     CLK_BUS_PLL_SEL_GPLL << CLK_BUS_PLL_SEL_SHIFT |
+			     (src_clk_div - 1) << ACLK_BUS_DIV_CON_SHIFT);
+		break;
+	case HCLK_BUS:
+		src_clk_div = DIV_ROUND_UP(rk3368_bus_get_clk(cru,
+							      ACLK_BUS),
+					   hz);
+		assert(src_clk_div - 1 < 3);
+		rk_clrsetreg(&cru->clksel_con[8],
+			     HCLK_BUS_DIV_CON_MASK,
+			     (src_clk_div - 1) << HCLK_BUS_DIV_CON_SHIFT);
+		break;
+	case PCLK_BUS:
+		src_clk_div = DIV_ROUND_UP(rk3368_bus_get_clk(cru,
+							      ACLK_BUS),
+					   hz);
+		assert(src_clk_div - 1 < 3);
+		rk_clrsetreg(&cru->clksel_con[8],
+			     PCLK_BUS_DIV_CON_MASK,
+			     (src_clk_div - 1) << PCLK_BUS_DIV_CON_SHIFT);
+		break;
+	default:
+		printf("do not support this bus freq\n");
+		return -EINVAL;
+	}
+	return rk3368_bus_get_clk(cru, clk_id);
+}
+#endif
+
 static ulong rk3368_clk_get_rate(struct clk *clk)
 {
 	struct rk3368_clk_priv *priv = dev_get_priv(clk->dev);
@@ -469,6 +545,17 @@ static ulong rk3368_clk_get_rate(struct clk *clk)
 	case SCLK_SPI0 ... SCLK_SPI2:
 		rate = rk3368_spi_get_clk(priv->cru, clk->id);
 		break;
+#if !IS_ENABLED(CONFIG_XPL_BUILD)
+	case ACLK_BUS:
+	case HCLK_BUS:
+	case PCLK_BUS:
+	case PCLK_PWM0:
+	case PCLK_PWM1:
+	case PCLK_I2C0:
+	case PCLK_I2C1:
+		rate = rk3368_bus_get_clk(priv->cru, clk->id);
+		break;
+#endif
 #if !IS_ENABLED(CONFIG_XPL_BUILD) || CONFIG_IS_ENABLED(MMC)
 	case HCLK_SDMMC:
 	case HCLK_EMMC:
@@ -500,6 +587,13 @@ static ulong rk3368_clk_set_rate(struct clk *clk, ulong rate)
 		ret = rk3368_ddr_set_clk(priv->cru, rate);
 		break;
 #endif
+#if !IS_ENABLED(CONFIG_XPL_BUILD)
+	case ACLK_BUS:
+	case HCLK_BUS:
+	case PCLK_BUS:
+		rate = rk3368_bus_set_clk(priv->cru, clk->id, rate);
+		break;
+#endif
 #if !IS_ENABLED(CONFIG_XPL_BUILD) || CONFIG_IS_ENABLED(MMC)
 	case HCLK_SDMMC:
 	case HCLK_EMMC:
-- 
2.39.5