From: Maxim Sloyko <[email protected]> In the absence of pinmux driver, I2C driver will be configuring pins directly.
Signed-off-by: Maxim Sloyko <[email protected]> --- arch/arm/include/asm/arch-aspeed/ast_scu.h | 5 +++++ arch/arm/mach-aspeed/ast-scu.c | 28 ++++++++++++++++++++++++++++ 2 files changed, 33 insertions(+) diff --git a/arch/arm/include/asm/arch-aspeed/ast_scu.h b/arch/arm/include/asm/arch-aspeed/ast_scu.h index eb5aaa2..80ebd6f 100644 --- a/arch/arm/include/asm/arch-aspeed/ast_scu.h +++ b/arch/arm/include/asm/arch-aspeed/ast_scu.h @@ -46,4 +46,9 @@ extern void ast_scu_init_eth(u8 num); extern void ast_scu_multi_func_eth(u8 num); extern void ast_scu_multi_func_romcs(u8 num); +/* Enable I2C controller and pins for a particular device. + * Device numbering starts at 1 + */ +extern void ast_scu_enable_i2c(u8 num); + #endif diff --git a/arch/arm/mach-aspeed/ast-scu.c b/arch/arm/mach-aspeed/ast-scu.c index e00dbe2..b5aa8bf 100644 --- a/arch/arm/mach-aspeed/ast-scu.c +++ b/arch/arm/mach-aspeed/ast-scu.c @@ -507,3 +507,31 @@ void ast_scu_get_who_init_dram(void) break; } } + +void ast_scu_enable_i2c(u8 bus_num) +{ + if (bus_num > SCU_I2C_MAX_BUS_NUM) { + debug("%s: bus_num is out of range, must be [%d - %d]\n", + __func__, SCU_I2C_MIN_BUS_NUM, SCU_I2C_MAX_BUS_NUM); + return; + } + + if (bus_num == 0) { + /* Enable I2C Controllers */ + clrbits_le32(AST_SCU_BASE + AST_SCU_RESET, SCU_RESET_I2C); + } else if (bus_num >= 3) { + setbits_le32(AST_SCU_BASE + AST_SCU_FUN_PIN_CTRL5, + SCU_FUN_PIN_I2C(bus_num)); + /* In earlier versions of the SoC these pins are always assigned to + * respective I2C buses and require no configuration. + */ +#ifdef AST_SOC_G5 + } else if (bus_num == 1) { + setbits_le32(AST_SCU_BASE + AST_SCU_FUN_PIN_CTRL8, + SCU_FUN_PIN_SDA1 | SCU_FUN_PIN_SCL1); + } else if (bus_num == 2) { + setbits_le32(AST_SCU_BASE + AST_SCU_FUN_PIN_CTRL8, + SCU_FUN_PIN_SDA2 | SCU_FUN_PIN_SCL2); +#endif + } +} -- 2.8.0.rc3.226.g39d4020 _______________________________________________ U-Boot mailing list [email protected] http://lists.denx.de/mailman/listinfo/u-boot
