diff options
Diffstat (limited to 'arch')
| -rw-r--r-- | arch/arm/cpu/armv7/u8500/cpu.c | 80 | ||||
| -rw-r--r-- | arch/arm/include/asm/arch-u8500/sys_proto.h | 1 |
2 files changed, 81 insertions, 0 deletions
diff --git a/arch/arm/cpu/armv7/u8500/cpu.c b/arch/arm/cpu/armv7/u8500/cpu.c index fece201f3f0..7126d9472c0 100644 --- a/arch/arm/cpu/armv7/u8500/cpu.c +++ b/arch/arm/cpu/armv7/u8500/cpu.c @@ -28,6 +28,24 @@ #include <asm/io.h> #include <asm/arch/prcmu.h> #include <asm/arch/clock.h> +#include <asm/arch/hardware.h> + +#include <asm/arch/hardware.h> + +#define CPUID_DB8500V1 0x411fc091 +#define ASICID_DB8500V11 0x008500A1 + +static unsigned int read_asicid(void) +{ + unsigned int *address = (void *)U8500_BOOTROM_BASE + + U8500_BOOTROM_ASIC_ID_OFFSET; + return readl(address); +} + +static int cpu_is_u8500v11(void) +{ + return read_asicid() == ASICID_DB8500V11; +} #ifdef CONFIG_ARCH_CPU_INIT /* @@ -41,3 +59,65 @@ int arch_cpu_init(void) return 0; } #endif /* CONFIG_ARCH_CPU_INIT */ + +#ifdef CONFIG_MMC + +#define LDO_VAUX3_MASK 0x3 +#define LDO_VAUX3_ENABLE 0x1 +#define VAUX3_VOLTAGE_2_9V 0xd + +#define AB8500_REGU_CTRL2 0x4 +#define AB8500_REGU_VRF1VAUX3_REGU_REG 0x040A +#define AB8500_REGU_VRF1VAUX3_SEL_REG 0x0421 + +int u8500_mmc_power_init(void) +{ + int ret; + int val; + + if (!cpu_is_u8500v11()) + return 0; + + /* + * On v1.1 HREF boards (HREF+), Vaux3 needs to be enabled for the SD + * card to work. This is done by enabling the regulators in the AB8500 + * via PRCMU I2C transactions. + * + * This code is derived from the handling of AB8500_LDO_VAUX3 in + * ab8500_ldo_enable() and ab8500_ldo_disable() in Linux. + * + * Turn off and delay is required to have it work across soft reboots. + */ + + ret = prcmu_i2c_read(AB8500_REGU_CTRL2, AB8500_REGU_VRF1VAUX3_REGU_REG); + if (ret < 0) + goto out; + + val = ret; + + /* Turn off */ + ret = prcmu_i2c_write(AB8500_REGU_CTRL2, AB8500_REGU_VRF1VAUX3_REGU_REG, + val & ~LDO_VAUX3_MASK); + if (ret < 0) + goto out; + + udelay(10 * 1000); + + /* Set the voltage to 2.9V */ + ret = prcmu_i2c_write(AB8500_REGU_CTRL2, + AB8500_REGU_VRF1VAUX3_SEL_REG, + VAUX3_VOLTAGE_2_9V); + if (ret < 0) + goto out; + + val = val & ~LDO_VAUX3_MASK; + val = val | LDO_VAUX3_ENABLE; + + /* Turn on the supply */ + ret = prcmu_i2c_write(AB8500_REGU_CTRL2, + AB8500_REGU_VRF1VAUX3_REGU_REG, val); + +out: + return ret; +} +#endif /* CONFIG_MMC */ diff --git a/arch/arm/include/asm/arch-u8500/sys_proto.h b/arch/arm/include/asm/arch-u8500/sys_proto.h index bac5e799908..a8ef9e5f44d 100644 --- a/arch/arm/include/asm/arch-u8500/sys_proto.h +++ b/arch/arm/include/asm/arch-u8500/sys_proto.h @@ -23,5 +23,6 @@ #define _SYS_PROTO_H_ void gpio_init(void); +int u8500_mmc_power_init(void); #endif /* _SYS_PROTO_H_ */ |