[U-Boot] [PATCH] arm: trats: add the sd-card power control function.

Jaehoon Chung
2013-10-31T13:37:45Z

To use the sd-card, VTF_2.8V will be enabled.
Before this patch, VTF_2.8V is always disabled.(card can't initialize.)
When card is detected, SD-card power will enable with sd_ldo_control().

Signed-off-by: Jaehoon Chung <jh80.chung@samsung.com>
Signed-off-by: Kyungmin Park <kyungmin.park@samsung.com>
---
board/samsung/trats/trats.c | 38 ++++++++++++++++++++++++++++++++------
1 file changed, 32 insertions(+), 6 deletions(-)

diff --git a/board/samsung/trats/trats.c b/board/samsung/trats/trats.c
index 7f61d17..9b6dd12 100644
--- a/board/samsung/trats/trats.c
+++ b/board/samsung/trats/trats.c
@@ -408,11 +408,31 @@ int checkboard(void)
#endif

#ifdef CONFIG_GENERIC_MMC
+static int sd_ldo_control(int on)
+{
+ struct pmic *p = pmic_get("MAX8997_PMIC");
+ u32 val = 0;
+ int ret = 0;
+ if (pmic_probe(p))
+ return -1;
+
+ /* LDO17 VTF: 2.8V */
+ val = max8997_reg_ldo(2800000) | (on? EN_LDO : DIS_LDO);
+ ret |= pmic_reg_write(p, MAX8997_REG_LDO17CTRL, val);
+
+ if (ret) {
+ puts("MAX8997 SD setting error!\n");
+ return -1;
+ }
+
+ return 0;
+}
+
int board_mmc_init(bd_t *bis)
{
struct exynos4_gpio_part2 *gpio =
(struct exynos4_gpio_part2 *)samsung_get_base_gpio_part2();
- int err;
+ int err, err_sd = 0;

/* eMMC_EN: SD_0_CDn: GPK0[2] Output High */
s5p_gpio_direction_output(&gpio->k0, 2, 1);
@@ -438,14 +458,20 @@ int board_mmc_init(bd_t *bis)
* GPX3[4] T-flash detect pin
*/
if (!s5p_gpio_get_value(&gpio->x3, 4)) {
- err = exynos_pinmux_config(PERIPH_ID_SDMMC2, PINMUX_FLAG_NONE);
- if (err)
+ err_sd = exynos_pinmux_config(PERIPH_ID_SDMMC2, PINMUX_FLAG_NONE);
+ if (err_sd)
debug("SDMMC2 not configured\n");
- else
- err = s5p_mmc_init(2, 4);
+ else {
+ if (!sd_ldo_control(1)) {
+ err_sd = s5p_mmc_init(2, 4);
+ if (err_sd) {
+ sd_ldo_control(0);
+ }
+ }
+ }
}

- return err;
+ return err & err_sd;
}
#endif

--
1.7.9.5