#include <asm/arch/mmc_host_def.h>
#include <asm/arch/sys_proto.h>
+/* common definitions for all OMAPs */
+#define SYSCTL_SRC (1 << 25)
+#define SYSCTL_SRD (1 << 26)
+
/* If we fail after 1 second wait, something is really bad */
#define MAX_RETRY_MS 1000
unsigned char mmc_board_init(struct mmc *mmc)
{
-#if defined(CONFIG_TWL4030_POWER)
- twl4030_power_mmc_init();
-#endif
-
#if defined(CONFIG_OMAP34XX)
t2_t *t2_base = (t2_t *)T2_BASE;
struct prcm *prcm_base = (struct prcm *)PRCM_BASE;
+ u32 pbias_lite;
- writel(readl(&t2_base->pbias_lite) | PBIASLITEPWRDNZ1 |
+ pbias_lite = readl(&t2_base->pbias_lite);
+ pbias_lite &= ~(PBIASLITEPWRDNZ1 | PBIASLITEPWRDNZ0);
+ writel(pbias_lite, &t2_base->pbias_lite);
+#endif
+#if defined(CONFIG_TWL4030_POWER)
+ twl4030_power_mmc_init();
+ mdelay(100); /* ramp-up delay from Linux code */
+#endif
+#if defined(CONFIG_OMAP34XX)
+ writel(pbias_lite | PBIASLITEPWRDNZ1 |
PBIASSPEEDCTRL0 | PBIASLITEPWRDNZ0,
&t2_base->pbias_lite);
return 0;
}
+/*
+ * MMC controller internal finite state machine reset
+ *
+ * Used to reset command or data internal state machines, using respectively
+ * SRC or SRD bit of SYSCTL register
+ */
+static void mmc_reset_controller_fsm(struct hsmmc *mmc_base, u32 bit)
+{
+ ulong start;
+
+ mmc_reg_out(&mmc_base->sysctl, bit, bit);
+
+ start = get_timer(0);
+ while ((readl(&mmc_base->sysctl) & bit) != 0) {
+ if (get_timer(0) - start > MAX_RETRY_MS) {
+ printf("%s: timedout waiting for sysctl %x to clear\n",
+ __func__, bit);
+ return;
+ }
+ }
+}
static int mmc_send_cmd(struct mmc *mmc, struct mmc_cmd *cmd,
struct mmc_data *data)
ulong start;
start = get_timer(0);
- while ((readl(&mmc_base->pstate) & DATI_MASK) == DATI_CMDDIS) {
+ while ((readl(&mmc_base->pstate) & (DATI_MASK | CMDI_MASK)) != 0) {
if (get_timer(0) - start > MAX_RETRY_MS) {
- printf("%s: timedout waiting for cmddis!\n", __func__);
+ printf("%s: timedout waiting on cmd inhibit to clear\n",
+ __func__);
return TIMEOUT;
}
}
start = get_timer(0);
while (readl(&mmc_base->stat)) {
if (get_timer(0) - start > MAX_RETRY_MS) {
- printf("%s: timedout waiting for stat!\n", __func__);
+ printf("%s: timedout waiting for STAT (%x) to clear\n",
+ __func__, readl(&mmc_base->stat));
return TIMEOUT;
}
}
}
} while (!mmc_stat);
- if ((mmc_stat & IE_CTO) != 0)
+ if ((mmc_stat & IE_CTO) != 0) {
+ mmc_reset_controller_fsm(mmc_base, SYSCTL_SRC);
return TIMEOUT;
- else if ((mmc_stat & ERRI_MASK) != 0)
+ } else if ((mmc_stat & ERRI_MASK) != 0)
return -1;
if (mmc_stat & CC_MASK) {
}
} while (mmc_stat == 0);
+ if ((mmc_stat & (IE_DTO | IE_DCRC | IE_DEB)) != 0)
+ mmc_reset_controller_fsm(mmc_base, SYSCTL_SRD);
+
if ((mmc_stat & ERRI_MASK) != 0)
return 1;
}
} while (mmc_stat == 0);
+ if ((mmc_stat & (IE_DTO | IE_DCRC | IE_DEB)) != 0)
+ mmc_reset_controller_fsm(mmc_base, SYSCTL_SRD);
+
if ((mmc_stat & ERRI_MASK) != 0)
return 1;