diff options
Diffstat (limited to 'arch')
| -rw-r--r-- | arch/arm/cpu/armv7/am33xx/board.c | 41 | ||||
| -rw-r--r-- | arch/arm/include/asm/arch-am33xx/common_def.h | 1 |
2 files changed, 40 insertions, 2 deletions
diff --git a/arch/arm/cpu/armv7/am33xx/board.c b/arch/arm/cpu/armv7/am33xx/board.c index 4634a9ab4f..a1fe104275 100644 --- a/arch/arm/cpu/armv7/am33xx/board.c +++ b/arch/arm/cpu/armv7/am33xx/board.c @@ -29,6 +29,7 @@ #include <asm/io.h> #include <asm/omap_common.h> #include <asm/emif.h> +#include <asm/gpio.h> #include <i2c.h> #include <miiphy.h> #include <cpsw.h> @@ -52,6 +53,9 @@ const struct gpio_bank *const omap_gpio_bank = gpio_bank_am33xx; #define MII_MODE_ENABLE 0x0 #define RGMII_MODE_ENABLE 0xA +/* GPIO that controls power to DDR on EVM-SK */ +#define GPIO_DDR_VTT_EN 7 + static struct ctrl_dev *cdev = (struct ctrl_dev *)CTRL_DEVICE_BASE; /* @@ -72,13 +76,18 @@ struct am335x_baseboard_id { char mac_addr[NO_OF_MAC_ADDR][ETH_ALEN]; }; -static struct am335x_baseboard_id header; +static struct am335x_baseboard_id __attribute__((section (".data"))) header; static inline int board_is_bone(void) { return !strncmp(header.name, "A335BONE", NAME_LEN); } +static inline int board_is_evm_sk(void) +{ + return !strncmp("A335X_SK", header.name, NAME_LEN); +} + /* * Read header information from EEPROM into global structure. */ @@ -145,6 +154,18 @@ static void init_timer(void) #endif /* + * Determine what type of DDR we have. + */ +static short inline board_memory_type(void) +{ + /* The following boards are known to use DDR3. */ + if (board_is_evm_sk()) + return EMIF_REG_SDRAM_TYPE_DDR3; + + return EMIF_REG_SDRAM_TYPE_DDR2; +} + +/* * early system init of muxing and clocks. */ void s_init(void) @@ -185,7 +206,23 @@ void s_init(void) preloader_console_init(); - config_ddr(EMIF_REG_SDRAM_TYPE_DDR2); + /* Initalize the board header */ + enable_i2c0_pin_mux(); + i2c_init(CONFIG_SYS_I2C_SPEED, CONFIG_SYS_I2C_SLAVE); + if (read_eeprom() < 0) + puts("Could not get board ID.\n"); + + if (board_is_evm_sk()) { + /* + * EVM SK 1.2A and later use gpio0_7 to enable DDR3. + * This is safe enough to do on older revs. + */ + enable_gpio0_7_pin_mux(); + gpio_request(GPIO_DDR_VTT_EN, "ddr_vtt_en"); + gpio_direction_output(GPIO_DDR_VTT_EN, 1); + } + + config_ddr(board_memory_type()); #endif /* Enable MMC0 */ diff --git a/arch/arm/include/asm/arch-am33xx/common_def.h b/arch/arm/include/asm/arch-am33xx/common_def.h index 5a7b0f3d34..1fe6258c01 100644 --- a/arch/arm/include/asm/arch-am33xx/common_def.h +++ b/arch/arm/include/asm/arch-am33xx/common_def.h @@ -18,6 +18,7 @@ extern void enable_uart0_pin_mux(void); extern void enable_mmc0_pin_mux(void); +extern void enable_gpio0_7_pin_mux(void); extern void enable_i2c0_pin_mux(void); extern void enable_mii1_pin_mux(void); extern void enable_rgmii1_pin_mux(void); |