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ARM: mx6: Handle the MMDCx_MDCTL COL field caprices 

The COL field value cannot be easily calculated from the desired
column number. Instead, there are special cases for that, see the
datasheet, MMDCx_MDCTL field description, field COL . Cater for
those special cases.

Signed-off-by: Marek Vasut <marex@denx.de>
This commit is contained in:
Marek Vasut 2014-08-04 01:47:10 +02:00 committed by Stefano Babic
parent fcfdfdd58c
commit b299ab7435
1 changed files with 7 additions and 1 deletions
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8
arch/arm/cpu/armv7/mx6/ddr.c
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@ -197,6 +197,7 @@ void mx6_dram_cfg(const struct mx6_ddr_sysinfo *i,
u16 trcd, trc, tras, twr, tmrd, trtp, trp, twtr, trfc, txs, txpr;
u16 CS0_END;
u16 tdllk = 0x1ff; /* DLL locking time: 512 cycles (JEDEC DDR3) */
u8 coladdr;
int clkper; /* clock period in picoseconds */
int clock; /* clock freq in mHz */
int cs;
@ -422,8 +423,13 @@ void mx6_dram_cfg(const struct mx6_ddr_sysinfo *i,
mmdc0->mdor = reg;
/* Step 5: Configure DDR physical parameters (density and burst len) */
coladdr = m->coladdr;
if (m->coladdr == 8) /* 8-bit COL is 0x3 */
coladdr += 4;
else if (m->coladdr == 12) /* 12-bit COL is 0x4 */
coladdr += 1;
reg = (m->rowaddr - 11) << 24 | /* ROW */
(m->coladdr - 9) << 20 | /* COL */
(coladdr - 9) << 20 | /* COL */
(1 << 19) | /* Burst Length = 8 for DDR3 */
(i->dsize << 16); /* DDR data bus size */
mmdc0->mdctl = reg;