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sunxi: Add i2c support

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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>
[ ijc -- updated u-boot-spl-fel.lds ]
This commit is contained in:
Hans de Goede 2014-06-13 22:55:49 +02:00 • committed by Ian Campbell
parent 0db2bbdc04
commit 6620377e4b
7 changed files with 64 additions and 0 deletions
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6
arch/arm/cpu/armv7/sunxi/board.c
View file

@ -11,6 +11,7 @@
*/
#include <common.h>
#include <i2c.h>
#include <netdev.h>
#include <miiphy.h>
#include <serial.h>
@ -93,11 +94,16 @@ 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
}

5
arch/arm/cpu/armv7/sunxi/u-boot-spl-fel.lds
View file

@ -26,6 +26,11 @@ SECTIONS
*(.data*)
}
. = ALIGN(4);
.u_boot_list : {
KEEP(*(SORT(.u_boot_list*)));
}
. = ALIGN(4);
. = .;

5
arch/arm/cpu/armv7/sunxi/u-boot-spl.lds
View file

@ -38,6 +38,11 @@ SECTIONS
. = ALIGN(4);
.data : { *(SORT_BY_ALIGNMENT(.data*)) } >.sram
. = ALIGN(4);
.u_boot_list : {
KEEP(*(SORT(.u_boot_list*)));
} > .sram
. = ALIGN(4);
__image_copy_end = .;
_end = .;

15
arch/arm/include/asm/arch-sunxi/i2c.h Normal file
View file

@ -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

7
board/sunxi/board.c
View file

@ -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)
{

18
drivers/i2c/mvtwsi.c
View file

@ -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
*/

8
include/configs/sunxi-common.h
View file

@ -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