[U-Boot] [PATCH v2 2/5] sunxi: Add i2c support

Hans de Goede
2014-06-13T20:55:49Z

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@redhat.com>
Acked-by: Ian Campbell <ijc@hellion.org.uk>
Acked-By: Prafulla Wadaskar <prafulla@marvell.com>
Acked-by: Heiko Schocher <hs@denx.de>
---
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@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 c8b5425..ab3ffa0 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