risc-v/bl808: Add I2C driver

This change implements a driver with support for all four I2C blocks on the BL808.

Author: henryrov

Documentation/platforms/risc-v/bl808/index.rst

@@ -48,7 +48,7 @@ DMA          No
 EMAC         No
 GPADC        Yes
 GPIO         Yes
-I2C          No
+I2C          Yes
 I2S          No
 PWM          No
 SPI          Yes

arch/risc-v/include/bl808/irq.h

@@ -54,6 +54,8 @@
 /* D0 IRQs ******************************************************************/
 
 #define BL808_IRQ_UART3 (RISCV_IRQ_SEXT + BL808_IRQ_NUM_BASE + 4)
+#define BL808_IRQ_I2C2 (RISCV_IRQ_SEXT + BL808_IRQ_NUM_BASE + 5)
+#define BL808_IRQ_I2C3 (RISCV_IRQ_SEXT + BL808_IRQ_NUM_BASE + 6)
 #define BL808_IRQ_SPI1 (RISCV_IRQ_SEXT + BL808_IRQ_NUM_BASE + 7)
 #define BL808_IRQ_D0_IPC (RISCV_IRQ_SEXT + BL808_IRQ_NUM_BASE + 38)
 #define BL808_IRQ_TIMER1_CH0 (RISCV_IRQ_SEXT + BL808_IRQ_NUM_BASE + 61)
@@ -68,8 +70,10 @@
 #define BL808_IRQ_UART0 (RISCV_IRQ_SEXT + BL808_IRQ_NUM_BASE + BL808_M0_IRQ_OFFSET + 28)
 #define BL808_IRQ_UART1 (RISCV_IRQ_SEXT + BL808_IRQ_NUM_BASE + BL808_M0_IRQ_OFFSET + 29)
 #define BL808_IRQ_UART2 (RISCV_IRQ_SEXT + BL808_IRQ_NUM_BASE + BL808_M0_IRQ_OFFSET + 30)
+#define BL808_IRQ_I2C0 (RISCV_IRQ_SEXT + BL808_IRQ_NUM_BASE + BL808_M0_IRQ_OFFSET + 32)
 #define BL808_IRQ_TIMER0_CH0 (RISCV_IRQ_SEXT + BL808_IRQ_NUM_BASE + BL808_M0_IRQ_OFFSET + 36)
 #define BL808_IRQ_TIMER0_CH1 (RISCV_IRQ_SEXT + BL808_IRQ_NUM_BASE + BL808_M0_IRQ_OFFSET + 37)
 #define BL808_IRQ_WDT0 (RISCV_IRQ_SEXT + BL808_IRQ_NUM_BASE + BL808_M0_IRQ_OFFSET + 38)
+#define BL808_IRQ_I2C1 (RISCV_IRQ_SEXT + BL808_IRQ_NUM_BASE + BL808_M0_IRQ_OFFSET + 39)
 
 #endif /* __ARCH_RISCV_INCLUDE_BL808_IRQ_H */

arch/risc-v/src/bl808/Kconfig

@@ -106,6 +106,98 @@ config BL808_GPADC_SCAN_ORD11
 
 endmenu
 
+menuconfig BL808_I2C0
+	bool "I2C 0"
+	default n
+	select I2C
+        select I2C_DRIVER
+        select ARCH_HAVE_I2CRESET
+
+if BL808_I2C0
+
+comment "Refer to datasheet for valid pin assignments"
+
+config BL808_I2C0_SCL
+	int "SCL Pin"
+	default 6
+	range 0 45
+
+config BL808_I2C0_SDA
+	int "SDA Pin"
+	default 7
+	range 0 45
+
+endif
+
+menuconfig BL808_I2C1
+	bool "I2C 1"
+	default n
+	select I2C
+        select I2C_DRIVER
+        select ARCH_HAVE_I2CRESET
+
+if BL808_I2C1
+
+comment "Refer to datasheet for valid pin assignments"
+
+config BL808_I2C1_SCL
+	int "SCL Pin"
+	default 6
+	range 0 45
+
+config BL808_I2C1_SDA
+	int "SDA Pin"
+	default 7
+	range 0 45
+
+endif
+
+menuconfig BL808_I2C2
+	bool "I2C 2"
+	default n
+	select I2C
+        select I2C_DRIVER
+        select ARCH_HAVE_I2CRESET
+
+if BL808_I2C2
+
+comment "Refer to datasheet for valid pin assignments"
+
+config BL808_I2C2_SCL
+	int "SCL Pin"
+	default 6
+	range 0 45
+
+config BL808_I2C2_SDA
+	int "SDA Pin"
+	default 7
+	range 0 45
+
+endif
+
+menuconfig BL808_I2C3
+	bool "I2C 3"
+	default n
+	select I2C
+        select I2C_DRIVER
+        select ARCH_HAVE_I2CRESET
+
+if BL808_I2C3
+
+comment "Refer to datasheet for valid pin assignments"
+
+config BL808_I2C3_SCL
+	int "SCL Pin"
+	default 6
+	range 0 45
+
+config BL808_I2C3_SDA
+	int "SDA Pin"
+	default 7
+	range 0 45
+
+endif
+
 config BL808_UART0
 	bool "UART 0"
 	default n

arch/risc-v/src/bl808/Make.defs

@@ -31,3 +31,4 @@ CHIP_CSRCS  = bl808_start.c bl808_irq_dispatch.c bl808_irq.c
 CHIP_CSRCS += bl808_timerisr.c bl808_allocateheap.c
 CHIP_CSRCS += bl808_gpio.c bl808_mm_init.c bl808_pgalloc.c bl808_serial.c
 CHIP_CSRCS += bl808_gpadc.c bl808_spi.c bl808_timer.c bl808_wdt.c
+CHIP_CSRCS += bl808_i2c.c

arch/risc-v/src/bl808/bl808_gpio.h

@@ -58,8 +58,8 @@
 
 #define GPIO_MODE_SHIFT  (10)                     /* Bit 10: Port Mode */
 #define GPIO_MODE_MASK   (1 << GPIO_MODE_SHIFT)
-#  define GPIO_INPUT     (1 << GPIO_MODE_SHIFT)  /* Input Enable */
-#  define GPIO_OUTPUT    (0 << GPIO_MODE_SHIFT)  /* Output Enable */
+#define GPIO_INPUT     (1 << GPIO_MODE_SHIFT)  /* Input Enable */
+#define GPIO_OUTPUT    (0 << GPIO_MODE_SHIFT)  /* Output Enable */
 
 /* Input/Output pull-ups/downs:
  *
@@ -116,13 +116,16 @@
 #define GPIO_FUNC_SDH    (0  << GPIO_FUNC_SHIFT)  /* SDH */
 #define GPIO_FUNC_SPI0   (1  << GPIO_FUNC_SHIFT)  /* SPI0 */
 #define GPIO_FUNC_FLASH  (2  << GPIO_FUNC_SHIFT)  /* Flash */
+#define GPIO_FUNC_I2C0   (5  << GPIO_FUNC_SHIFT)  /* I2C0 */
 #define GPIO_FUNC_I2C1   (6  << GPIO_FUNC_SHIFT)  /* I2C1 */
 #define GPIO_FUNC_UART   (7  << GPIO_FUNC_SHIFT)  /* UART */
 #define GPIO_FUNC_CAM    (9  << GPIO_FUNC_SHIFT)  /* CSI */
 #define GPIO_FUNC_ANA    (10 << GPIO_FUNC_SHIFT)  /* Analog */
 #define GPIO_FUNC_SWGPIO (11 << GPIO_FUNC_SHIFT)  /* Software GPIO */
 #define GPIO_FUNC_PWM0   (16 << GPIO_FUNC_SHIFT)  /* PWM0 */
 #define GPIO_FUNC_SPI1   (18 << GPIO_FUNC_SHIFT)  /* SPI1 */
+#define GPIO_FUNC_I2C2   (19  << GPIO_FUNC_SHIFT) /* I2C2 */
+#define GPIO_FUNC_I2C3   (20  << GPIO_FUNC_SHIFT) /* I2C3 */
 #define GPIO_FUNC_JTAG_D0 (27 << GPIO_FUNC_SHIFT) /* JTAG */
 
 /****************************************************************************