[U-Boot] [PATCH 2/5] sunxi: Add i2c support

[Hans de Goede]

Add support for the i2c controller found on all Allwinner sunxi SoCs,
this is the same controller as found on the Marvell orion5x and kirkwood
SoC families, with a slightly different register layout, so this patch uses
the existing mvtwsi code.

Signed-off-by: Hans de Goede <hdegoede at redhat.com>
Acked-by: Ian Campbell <ijc at hellion.org.uk>
---
 arch/arm/cpu/armv7/sunxi/board.c        |  6 ++++++
 arch/arm/cpu/armv7/sunxi/u-boot-spl.lds |  5 +++++
 arch/arm/include/asm/arch-sunxi/i2c.h   | 15 +++++++++++++++
 board/sunxi/board.c                     |  7 +++++++
 drivers/i2c/mvtwsi.c                    | 18 ++++++++++++++++++
 include/configs/sunxi-common.h          |  8 ++++++++
 6 files changed, 59 insertions(+)
 create mode 100644 arch/arm/include/asm/arch-sunxi/i2c.h

diff --git a/arch/arm/cpu/armv7/sunxi/board.c b/arch/arm/cpu/armv7/sunxi/board.c
index 1e506b5..024c8c1 100644
--- a/arch/arm/cpu/armv7/sunxi/board.c
+++ b/arch/arm/cpu/armv7/sunxi/board.c
@@ -11,6 +11,7 @@
  */
 
 #include <common.h>
+#include <i2c.h>
 #include <netdev.h>
 #include <miiphy.h>
 #include <serial.h>
@@ -91,11 +92,16 @@ void s_init(void)
 	clock_init();
 	timer_init();
 	gpio_init();
+	i2c_init_board();
 
 #ifdef CONFIG_SPL_BUILD
 	gd = &gdata;
 	preloader_console_init();
 
+#ifdef CONFIG_SPL_I2C_SUPPORT
+	/* Needed early by sunxi_board_init if PMU is enabled */
+	i2c_init(CONFIG_SYS_I2C_SPEED, CONFIG_SYS_I2C_SLAVE);
+#endif
 	sunxi_board_init();
 #endif
 }
diff --git a/arch/arm/cpu/armv7/sunxi/u-boot-spl.lds b/arch/arm/cpu/armv7/sunxi/u-boot-spl.lds
index c1ae227..53f0cbd 100644
--- a/arch/arm/cpu/armv7/sunxi/u-boot-spl.lds
+++ b/arch/arm/cpu/armv7/sunxi/u-boot-spl.lds
@@ -39,6 +39,11 @@ SECTIONS
 	.data : { *(SORT_BY_ALIGNMENT(.data*)) } >.sram
 
 	. = ALIGN(4);
+	.u_boot_list : {
+		KEEP(*(SORT(.u_boot_list*)));
+	} > .sram
+
+	. = ALIGN(4);
 	__image_copy_end = .;
 	_end = .;
 
diff --git a/arch/arm/include/asm/arch-sunxi/i2c.h b/arch/arm/include/asm/arch-sunxi/i2c.h
new file mode 100644
index 0000000..dc5406b
--- /dev/null
+++ b/arch/arm/include/asm/arch-sunxi/i2c.h
@@ -0,0 +1,15 @@
+/*
+ * Copyright 2014 - Hans de Goede <hdegoede at redhat.com>
+ *
+ * SPDX-License-Identifier:	GPL-2.0+
+ */
+#ifndef _SUNXI_I2C_H_
+#define _SUNXI_I2C_H_
+
+#include <asm/arch/cpu.h>
+
+#define CONFIG_I2C_MVTWSI_BASE	SUNXI_TWI0_BASE
+/* This is abp0-clk on sun4i/5i/7i / abp1-clk on sun6i/sun8i which is 24MHz */
+#define CONFIG_SYS_TCLK		24000000
+
+#endif
diff --git a/board/sunxi/board.c b/board/sunxi/board.c
index b05d0b9..543b809 100644
--- a/board/sunxi/board.c
+++ b/board/sunxi/board.c
@@ -106,6 +106,13 @@ int board_mmc_init(bd_t *bis)
 }
 #endif
 
+void i2c_init_board(void)
+{
+	sunxi_gpio_set_cfgpin(SUNXI_GPB(0), SUNXI_GPB0_TWI0);
+	sunxi_gpio_set_cfgpin(SUNXI_GPB(1), SUNXI_GPB0_TWI0);
+	clock_twi_onoff(0, 1);
+}
+
 #ifdef CONFIG_SPL_BUILD
 void sunxi_board_init(void)
 {
diff --git a/drivers/i2c/mvtwsi.c b/drivers/i2c/mvtwsi.c
index d3457b9..ad1ce8f 100644
--- a/drivers/i2c/mvtwsi.c
+++ b/drivers/i2c/mvtwsi.c
@@ -22,6 +22,8 @@
 #include <asm/arch/orion5x.h>
 #elif defined(CONFIG_KIRKWOOD)
 #include <asm/arch/kirkwood.h>
+#elif defined(CONFIG_SUNXI)
+#include <asm/arch/i2c.h>
 #else
 #error Driver mvtwsi not supported by SoC or board
 #endif
@@ -30,6 +32,20 @@
  * TWSI register structure
  */
 
+#ifdef CONFIG_SUNXI
+
+struct  mvtwsi_registers {
+	u32 slave_address;
+	u32 xtnd_slave_addr;
+	u32 data;
+	u32 control;
+	u32 status;
+	u32 baudrate;
+	u32 soft_reset;
+};
+
+#else
+
 struct  mvtwsi_registers {
 	u32 slave_address;
 	u32 data;
@@ -43,6 +59,8 @@ struct  mvtwsi_registers {
 	u32 soft_reset;
 };
 
+#endif
+
 /*
  * Control register fields
  */
diff --git a/include/configs/sunxi-common.h b/include/configs/sunxi-common.h
index 3f04890..42b0d2e 100644
--- a/include/configs/sunxi-common.h
+++ b/include/configs/sunxi-common.h
@@ -161,6 +161,14 @@
 #undef CONFIG_CMD_NET
 #undef CONFIG_CMD_NFS
 
+/* I2C */
+#define CONFIG_SPL_I2C_SUPPORT
+#define CONFIG_SYS_I2C
+#define CONFIG_SYS_I2C_MVTWSI
+#define CONFIG_SYS_I2C_SPEED		400000
+#define CONFIG_SYS_I2C_SLAVE		0x7f
+#define CONFIG_CMD_I2C
+
 #ifndef CONFIG_CONS_INDEX
 #define CONFIG_CONS_INDEX              1       /* UART0 */
 #endif
-- 
2.0.0