rockchip: rk3288: Add i2s pinctrl and clock support

Add support for setting pinctrl and clock for I2S on rk3288. This allows
the sound driver to operate. These settings were created by rkmux.py

Signed-off-by: Simon Glass <sjg@chromium.org>
Reviewed-by: Philipp Tomsich <philipp.tomsich@theobroma-systems.com>

5 files changed, 167 insertions, 0 deletions

diff --git a/arch/arm/include/asm/arch-rockchip/cru_rk3288.h b/arch/arm/include/asm/arch-rockchip/cru_rk3288.h
index 0475598b77b..e891f20b373 100644
--- a/arch/arm/include/asm/arch-rockchip/cru_rk3288.h
+++ b/arch/arm/include/asm/arch-rockchip/cru_rk3288.h
@@ -75,6 +75,14 @@ enum {
 	MMC0_DIV_MASK		= 0x3f << MMC0_DIV_SHIFT,
 };
 
+/* CRU_CLKSEL8_CON */
+enum {
+	I2S0_FRAC_DENOM_SHIFT	= 0,
+	I2S0_FRAC_DENOM_MASK	= 0xffff << I2S0_FRAC_DENOM_SHIFT,
+	I2S0_FRAC_NUMER_SHIFT	= 16,
+	I2S0_FRAC_NUMER_MASK	= 0xffffu << I2S0_FRAC_NUMER_SHIFT,
+};
+
 /* CRU_CLKSEL12_CON */
 enum {
 	EMMC_PLL_SHIFT		= 0xe,
diff --git a/arch/arm/include/asm/arch-rockchip/grf_rk3288.h b/arch/arm/include/asm/arch-rockchip/grf_rk3288.h
index c235607cee5..77295446c63 100644
--- a/arch/arm/include/asm/arch-rockchip/grf_rk3288.h
+++ b/arch/arm/include/asm/arch-rockchip/grf_rk3288.h
@@ -561,6 +561,49 @@ enum {
 	GPIO5C0_TS0_SYNC,
 };
 
+/* GRF_GPIO6A_IOMUX */
+enum {
+	GPIO6A7_SHIFT		= 0xe,
+	GPIO6A7_MASK		= 1,
+	GPIO6A7_GPIO		= 0,
+	GPIO6A7_I2S_SDO3,
+
+	GPIO6A6_SHIFT		= 0xc,
+	GPIO6A6_MASK		= 1,
+	GPIO6A6_GPIO		= 0,
+	GPIO6A6_I2S_SDO2,
+
+	GPIO6A5_SHIFT		= 0xa,
+	GPIO6A5_MASK		= 1,
+	GPIO6A5_GPIO		= 0,
+	GPIO6A5_I2S_SDO1,
+
+	GPIO6A4_SHIFT		= 8,
+	GPIO6A4_MASK		= 1,
+	GPIO6A4_GPIO		= 0,
+	GPIO6A4_I2S_SDO0,
+
+	GPIO6A3_SHIFT		= 6,
+	GPIO6A3_MASK		= 1,
+	GPIO6A3_GPIO		= 0,
+	GPIO6A3_I2S_SDI,
+
+	GPIO6A2_SHIFT		= 4,
+	GPIO6A2_MASK		= 1,
+	GPIO6A2_GPIO		= 0,
+	GPIO6A2_I2S_LRCKTX,
+
+	GPIO6A1_SHIFT		= 2,
+	GPIO6A1_MASK		= 1,
+	GPIO6A1_GPIO		= 0,
+	GPIO6A1_I2S_LRCKRX,
+
+	GPIO6A0_SHIFT		= 0,
+	GPIO6A0_MASK		= 1,
+	GPIO6A0_GPIO		= 0,
+	GPIO6A0_I2S_SCLK,
+};
+
 /* GRF_GPIO6B_IOMUX */
 enum {
 	GPIO6B3_SHIFT		= 6,
@@ -1042,6 +1085,59 @@ enum GRF_SOC_CON8 {
 	RK3288_DPHY_TX0_TURNREQUEST_DIS = 0,
 };
 
+/* GRF_IO_VSEL */
+enum {
+	GPIO1830_V18SEL_SHIFT		= 9,
+	GPIO1830_V18SEL_MASK		= 1,
+	GPIO1830_V18SEL_3_3V		= 0,
+	GPIO1830_V18SEL_1_8V,
+
+	GPIO30_V18SEL_SHIFT	= 8,
+	GPIO30_V18SEL_MASK	= 1,
+	GPIO30_V18SEL_3_3V	= 0,
+	GPIO30_V18SEL_1_8V,
+
+	SDCARD_V18SEL_SHIFT	= 7,
+	SDCARD_V18SEL_MASK	= 1,
+	SDCARD_V18SEL_3_3V	= 0,
+	SDCARD_V18SEL_1_8V,
+
+	AUDIO_V18SEL_SHIFT	= 6,
+	AUDIO_V18SEL_MASK	= 1,
+	AUDIO_V18SEL_3_3V	= 0,
+	AUDIO_V18SEL_1_8V,
+
+	BB_V18SEL_SHIFT		= 5,
+	BB_V18SEL_MASK		= 1,
+	BB_V18SEL_3_3V		= 0,
+	BB_V18SEL_1_8V,
+
+	WIFI_V18SEL_SHIFT	= 4,
+	WIFI_V18SEL_MASK	= 1,
+	WIFI_V18SEL_3_3V	= 0,
+	WIFI_V18SEL_1_8V,
+
+	FLASH1_V18SEL_SHIFT	= 3,
+	FLASH1_V18SEL_MASK	= 1,
+	FLASH1_V18SEL_3_3V	= 0,
+	FLASH1_V18SEL_1_8V,
+
+	FLASH0_V18SEL_SHIFT	= 2,
+	FLASH0_V18SEL_MASK	= 1,
+	FLASH0_V18SEL_3_3V	= 0,
+	FLASH0_V18SEL_1_8V,
+
+	DVP_V18SEL_SHIFT	= 1,
+	DVP_V18SEL_MASK		= 1,
+	DVP_V18SEL_3_3V		= 0,
+	DVP_V18SEL_1_8V,
+
+	LCDC_V18SEL_SHIFT	= 0,
+	LCDC_V18SEL_MASK	= 1,
+	LCDC_V18SEL_3_3V	= 0,
+	LCDC_V18SEL_1_8V,
+};
+
 /* GPIO Bias settings */
 enum GPIO_BIAS {
 	GPIO_BIAS_2MA = 0,
diff --git a/arch/arm/include/asm/arch-rockchip/periph.h b/arch/arm/include/asm/arch-rockchip/periph.h
index 514baf6a535..2191b7d43a8 100644
--- a/arch/arm/include/asm/arch-rockchip/periph.h
+++ b/arch/arm/include/asm/arch-rockchip/periph.h
@@ -45,6 +45,7 @@ enum periph_id {
 	PERIPH_ID_HDMI,
 	PERIPH_ID_GMAC,
 	PERIPH_ID_SFC,
+	PERIPH_ID_I2S,
 
 	PERIPH_ID_COUNT,
 
diff --git a/drivers/clk/rockchip/clk_rk3288.c b/drivers/clk/rockchip/clk_rk3288.c
index 4a6e5c7113d..930c99f4d9f 100644
--- a/drivers/clk/rockchip/clk_rk3288.c
+++ b/drivers/clk/rockchip/clk_rk3288.c
@@ -6,6 +6,7 @@
 #include <common.h>
 #include <bitfield.h>
 #include <clk-uclass.h>
+#include <div64.h>
 #include <dm.h>
 #include <dt-structs.h>
 #include <errno.h>
@@ -371,6 +372,50 @@ static int rockchip_vop_set_clk(struct rk3288_cru *cru, struct rk3288_grf *grf,
 
 	return 0;
 }
+
+static u32 rockchip_clk_gcd(u32 a, u32 b)
+{
+	while (b != 0) {
+		int r = b;
+
+		b = a % b;
+		a = r;
+	}
+	return a;
+}
+
+static ulong rockchip_i2s_get_clk(struct rk3288_cru *cru, uint gclk_rate)
+{
+	unsigned long long rate;
+	uint val;
+	int n, d;
+
+	val = readl(&cru->cru_clksel_con[8]);
+	n = (val & I2S0_FRAC_NUMER_MASK) >> I2S0_FRAC_NUMER_SHIFT;
+	d = (val & I2S0_FRAC_DENOM_MASK) >> I2S0_FRAC_DENOM_SHIFT;
+
+	rate = (unsigned long long)gclk_rate * n;
+	do_div(rate, d);
+
+	return (ulong)rate;
+}
+
+static ulong rockchip_i2s_set_clk(struct rk3288_cru *cru, uint gclk_rate,
+				  uint freq)
+{
+	int n, d;
+	int v;
+
+	/* set frac divider */
+	v = rockchip_clk_gcd(gclk_rate, freq);
+	n = gclk_rate / v;
+	d = freq / v;
+	assert(freq == gclk_rate / n * d);
+	writel(d << I2S0_FRAC_NUMER_SHIFT | n << I2S0_FRAC_DENOM_SHIFT,
+	       &cru->cru_clksel_con[8]);
+
+	return rockchip_i2s_get_clk(cru, gclk_rate);
+}
 #endif /* CONFIG_SPL_BUILD */
 
 static void rkclk_init(struct rk3288_cru *cru, struct rk3288_grf *grf)
@@ -769,6 +814,9 @@ static ulong rk3288_clk_set_rate(struct clk *clk, ulong rate)
 		new_rate = rockchip_spi_set_clk(cru, gclk_rate, clk->id, rate);
 		break;
 #ifndef CONFIG_SPL_BUILD
+	case SCLK_I2S0:
+		new_rate = rockchip_i2s_set_clk(cru, gclk_rate, rate);
+		break;
 	case SCLK_MAC:
 		new_rate = rockchip_mac_set_clk(priv->cru, rate);
 		break;
diff --git a/drivers/pinctrl/rockchip/pinctrl_rk3288.c b/drivers/pinctrl/rockchip/pinctrl_rk3288.c
index 3e01cfd98f4..fd19cfb51cc 100644
--- a/drivers/pinctrl/rockchip/pinctrl_rk3288.c
+++ b/drivers/pinctrl/rockchip/pinctrl_rk3288.c
@@ -531,6 +531,17 @@ static void pinctrl_rk3288_hdmi_config(struct rk3288_grf *grf, int hdmi_id)
 		break;
 	}
 }
+
+static void pinctrl_rk3288_i2s_config(struct rk3288_grf *grf)
+{
+	rk_setreg(&grf->gpio6a_iomux, GPIO6A4_I2S_SDO0 << GPIO6A4_SHIFT |
+		  GPIO6A3_I2S_SDI << GPIO6A3_SHIFT |
+		  GPIO6A2_I2S_LRCKTX << GPIO6A2_SHIFT |
+		  GPIO6A1_I2S_LRCKRX << GPIO6A1_SHIFT |
+		  GPIO6A0_I2S_SCLK << GPIO6A0_SHIFT);
+	rk_setreg(&grf->gpio6b_iomux, GPIO6B0_I2S_CLK << GPIO6B0_SHIFT);
+	rk_setreg(&grf->io_vsel, AUDIO_V18SEL_1_8V << AUDIO_V18SEL_SHIFT);
+}
 #endif
 
 static int rk3288_pinctrl_request(struct udevice *dev, int func, int flags)
@@ -567,6 +578,9 @@ static int rk3288_pinctrl_request(struct udevice *dev, int func, int flags)
 		pinctrl_rk3288_uart_config(priv->grf, func);
 		break;
 #ifndef CONFIG_SPL_BUILD
+	case PERIPH_ID_I2S:
+		pinctrl_rk3288_i2s_config(priv->grf);
+		break;
 	case PERIPH_ID_LCDC0:
 	case PERIPH_ID_LCDC1:
 		pinctrl_rk3288_lcdc_config(priv->grf, func);