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arm: mxs: Wait for DRAM to start

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Instead of waiting for a fixed period of time and hoping for the best
that the DRAM will start, read back an EMI status register which tells
us exactly when the DRAM started.

Signed-off-by: Marek Vasut <marex@denx.de>
Cc: Stefano Babic <sbabic@denx.de>
This commit is contained in:
Marek Vasut 2014-04-28 03:38:41 +02:00 • committed by Stefano Babic
parent be0ecdbed5
commit 7c604e98c2
1 changed files with 7 additions and 1 deletions
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8
arch/arm/cpu/arm926ejs/mxs/spl_mem_init.c
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@ -274,7 +274,13 @@ static void mx23_mem_init(void)
setbits_le32(MXS_DRAM_BASE + 0x20, 1 << 16);
clrbits_le32(MXS_DRAM_BASE + 0x40, 1 << 17);
early_delay(20000);
/* Wait for EMI_STAT bit DRAM_HALTED */
for (;;) {
if (!(readl(MXS_EMI_BASE + 0x10) & (1 << 1)))
break;
early_delay(1000);
}
/* Adjust EMI port priority. */
clrsetbits_le32(0x80020000, 0x1f << 16, 0x2);