sunxi: Add support for the I2C controller which is part of the PRCM

Signed-off-by: Jelle van der Waa <jelle@vdwaa.nl>
[hdegoede@redhat.com: Minor cleanups]
Signed-off-by: Hans de Goede <hdegoede@redhat.com>

applied with fixing 2 checkpatch warnings:
WARNING: please, no space before tabs

Signed-off-by: Heiko Schocher <hs@denx.de>

arch/arm/cpu/armv7/sunxi/clock_sun6i.c

@@ -77,6 +77,16 @@ int clock_twi_onoff(int port, int state)
 	struct sunxi_ccm_reg *const ccm =
 		(struct sunxi_ccm_reg *)SUNXI_CCM_BASE;
 
+	if (port == 5) {
+		if (state)
+			prcm_apb0_enable(
+				PRCM_APB0_GATE_PIO | PRCM_APB0_GATE_I2C);
+		else
+			prcm_apb0_disable(
+				PRCM_APB0_GATE_PIO | PRCM_APB0_GATE_I2C);
+		return 0;
+	}
+
 	/* set the apb clock gate for twi */
 	if (state)
 		setbits_le32(&ccm->apb2_gate,

arch/arm/cpu/armv7/sunxi/prcm.c

@@ -33,3 +33,15 @@ void prcm_apb0_enable(u32 flags)
 	/* deassert reset for module */
 	setbits_le32(&prcm->apb0_reset, flags);
 }
+
+void prcm_apb0_disable(u32 flags)
+{
+	struct sunxi_prcm_reg *prcm =
+		(struct sunxi_prcm_reg *)SUNXI_PRCM_BASE;
+
+	/* assert reset for module */
+	clrbits_le32(&prcm->apb0_reset, flags);
+
+	/* close the clock for module */
+	clrbits_le32(&prcm->apb0_gate, flags);
+}

arch/arm/include/asm/arch-sunxi/cpu_sun4i.h

@@ -134,6 +134,7 @@
 #define SUNXI_RTC_BASE			0x01f00000
 #define SUNXI_PRCM_BASE			0x01f01400
 #define SUN6I_CPUCFG_BASE		0x01f01c00
+#define SUNXI_R_TWI_BASE		0x01f02400
 #define SUNXI_R_UART_BASE		0x01f02800
 #define SUNXI_R_PIO_BASE		0x01f02c00
 #define SUN6I_P2WI_BASE			0x01f03400

arch/arm/include/asm/arch-sunxi/gpio.h

@@ -199,6 +199,8 @@ enum sunxi_gpio_number {
 #define SUN6I_GPL1_R_P2WI_SDA	3
 
 #define SUN8I_GPL_R_RSB		2
+#define SUN8I_H3_GPL_R_TWI	2
+#define SUN8I_A23_GPL_R_TWI	3
 #define SUN8I_GPL_R_UART	2
 
 #define SUN9I_GPN_R_RSB		3

arch/arm/include/asm/arch-sunxi/i2c.h

@@ -23,6 +23,9 @@
 #ifdef CONFIG_I2C4_ENABLE
 #define CONFIG_I2C_MVTWSI_BASE4	SUNXI_TWI4_BASE
 #endif
+#ifdef CONFIG_R_I2C_ENABLE
+#define CONFIG_I2C_MVTWSI_BASE5 SUNXI_R_TWI_BASE
+#endif
 
 /* This is abp0-clk on sun4i/5i/7i / abp1-clk on sun6i/sun8i which is 24MHz */
 #define CONFIG_SYS_TCLK		24000000

arch/arm/include/asm/arch-sunxi/prcm.h

@@ -236,5 +236,7 @@ struct sunxi_prcm_reg {
 };
 
 void prcm_apb0_enable(u32 flags);
+void prcm_apb0_disable(u32 flags);
+
 #endif /* __ASSEMBLY__ */
 #endif /* _PRCM_H */

board/sunxi/Kconfig

@@ -363,6 +363,12 @@ config I2C3_ENABLE
 	See I2C0_ENABLE help text.
 endif
 
+config R_I2C_ENABLE
+	bool "Enable the PRCM I2C/TWI controller"
+	default n
+	---help---
+	Set this to y to enable the I2C controller which is part of the PRCM.
+
 if MACH_SUN7I
 config I2C4_ENABLE
 	bool "Enable I2C/TWI controller 4"

board/sunxi/board.c

@@ -422,6 +422,12 @@ void i2c_init_board(void)
 	clock_twi_onoff(4, 1);
 #endif
 #endif
+
+#ifdef CONFIG_R_I2C_ENABLE
+	clock_twi_onoff(5, 1);
+	sunxi_gpio_set_cfgpin(SUNXI_GPL(0), SUN8I_H3_GPL_R_TWI);
+	sunxi_gpio_set_cfgpin(SUNXI_GPL(1), SUN8I_H3_GPL_R_TWI);
+#endif
 }
 
 #ifdef CONFIG_SPL_BUILD

configs/orangepi_pc_defconfig

@@ -12,3 +12,4 @@ CONFIG_SPL=y
 # CONFIG_CMD_FLASH is not set
 # CONFIG_CMD_FPGA is not set
 CONFIG_CMD_GPIO=y
+CONFIG_R_I2C_ENABLE=y

drivers/i2c/mvtwsi.c

@@ -128,6 +128,10 @@ static struct mvtwsi_registers *twsi_get_base(struct i2c_adapter *adap)
 	case 4:
 		return (struct mvtwsi_registers *) CONFIG_I2C_MVTWSI_BASE4;
 #endif
+#ifdef CONFIG_I2C_MVTWSI_BASE5
+	case 5:
+		return (struct mvtwsi_registers *) CONFIG_I2C_MVTWSI_BASE5;
+#endif
 	default:
 		printf("Missing mvtwsi controller %d base\n", adap->hwadapnr);
 		break;
@@ -487,3 +491,10 @@ U_BOOT_I2C_ADAP_COMPLETE(twsi4, twsi_i2c_init, twsi_i2c_probe,
 			 CONFIG_SYS_I2C_SPEED, CONFIG_SYS_I2C_SLAVE, 4)
 
 #endif
+#ifdef CONFIG_I2C_MVTWSI_BASE5
+U_BOOT_I2C_ADAP_COMPLETE(twsi5, twsi_i2c_init, twsi_i2c_probe,
+			 twsi_i2c_read, twsi_i2c_write,
+			 twsi_i2c_set_bus_speed,
+			 CONFIG_SYS_I2C_SPEED, CONFIG_SYS_I2C_SLAVE, 5)
+
+#endif

include/configs/sunxi-common.h

@@ -212,7 +212,7 @@
 
 #if defined CONFIG_I2C0_ENABLE || defined CONFIG_I2C1_ENABLE || \
     defined CONFIG_I2C2_ENABLE || defined CONFIG_I2C3_ENABLE || \
-    defined CONFIG_I2C4_ENABLE
+    defined CONFIG_I2C4_ENABLE || defined CONFIG_R_I2C_ENABLE
 #define CONFIG_SYS_I2C
 #define CONFIG_SYS_I2C_MVTWSI
 #define CONFIG_SYS_I2C_SPEED		400000