Hung-Te Lin (hungte@chromium.org) just uploaded a new patch set to gerrit, which you can find at http://review.coreboot.org/2561
-gerrit
commit bd3d5dbbf9a3588436013eb04803507e94d767c7 Author: Hung-Te Lin hungte@chromium.org Date: Fri Mar 1 10:34:04 2013 +0800
armv7/snow: Add S5P MSHC initialization in ROM stage.
The SD/MMC interface on Exynos 5250 must be first configured with, GPIO, and pinmux settings before it can be detected and used in ramstage / payload.
Verified on armv7/snow and successfully boot into ramstage.
Change-Id: I26669eaaa212ab51ca72e8b7712970639a24e5c5 Signed-off-by: Hung-Te Lin hungte@chromium.org --- src/mainboard/google/snow/romstage.c | 24 ++++++++++++++++++++++++ 1 file changed, 24 insertions(+)
diff --git a/src/mainboard/google/snow/romstage.c b/src/mainboard/google/snow/romstage.c index 9891011..7e1cd57 100644 --- a/src/mainboard/google/snow/romstage.c +++ b/src/mainboard/google/snow/romstage.c @@ -24,8 +24,10 @@ #include <cbfs.h> #include <common.h>
+#include <arch/gpio.h> #include <cpu/samsung/exynos5250/clk.h> #include <cpu/samsung/exynos5250/dmc.h> +#include <cpu/samsung/exynos5250/gpio.h> #include <cpu/samsung/exynos5250/setup.h> #include <cpu/samsung/exynos5250/periph.h> #include <cpu/samsung/exynos5250/clock_init.h> @@ -35,6 +37,8 @@
#include "mainboard.h"
+#define MMC0_GPIO_PIN (58) + #if 0 static int board_wakeup_permitted(void) { @@ -48,6 +52,24 @@ static int board_wakeup_permitted(void) } #endif
+static void initialize_s5p_mshc(void) { + /* MMC0: Fixed, support 8 bit mode, connected with GPIO. */ + if (clock_set_mshci(PERIPH_ID_SDMMC0)) + printk(BIOS_CRIT, "Failed to set clock for SDMMC0.\n"); + if (gpio_direction_output(MMC0_GPIO_PIN, 1)) { + printk(BIOS_CRIT, "Unable to power on SDMMC0.\n"); + } + gpio_set_pull(MMC0_GPIO_PIN, EXYNOS_GPIO_PULL_NONE); + gpio_set_drv(MMC0_GPIO_PIN, EXYNOS_GPIO_DRV_4X); + /* TODO(hungte) Change 0 to PINMUX_FLAG_8BIT_MODE when the s5p_mshc + * driver is ready. */ + exynos_pinmux_config(PERIPH_ID_SDMMC0, 0); + + /* MMC2: Removable, 4 bit mode, no GPIO. */ + clock_set_mshci(PERIPH_ID_SDMMC2); + exynos_pinmux_config(PERIPH_ID_SDMMC2, 0); +} + void main(void) { struct mem_timings *mem; @@ -84,6 +106,8 @@ void main(void)
mmu_setup(CONFIG_SYS_SDRAM_BASE, CONFIG_DRAM_SIZE_MB);
+ initialize_s5p_mshc(); + entry = cbfs_load_stage(CBFS_DEFAULT_MEDIA, "fallback/coreboot_ram"); printk(BIOS_INFO, "entry is 0x%p, leaving romstage.\n", entry);