From: Icenowy Zheng icenowy@aosc.xyz
Some DDR2 DRAM have only four banks, not eight.
Add code to detect this situation.
Signed-off-by: Icenowy Zheng icenowy@aosc.xyz --- arch/arm/mach-sunxi/dram_sunxi_dw.c | 19 +++++++++++++++---- 1 file changed, 15 insertions(+), 4 deletions(-)
diff --git a/arch/arm/mach-sunxi/dram_sunxi_dw.c b/arch/arm/mach-sunxi/dram_sunxi_dw.c index de683a1b63..3f54c8ee09 100644 --- a/arch/arm/mach-sunxi/dram_sunxi_dw.c +++ b/arch/arm/mach-sunxi/dram_sunxi_dw.c @@ -31,6 +31,7 @@ struct dram_para { u8 bus_full_width; u8 dual_rank; u8 row_bits; + u8 bank_bits; const u8 dx_read_delays[NR_OF_BYTE_LANES][LINES_PER_BYTE_LANE]; const u8 dx_write_delays[NR_OF_BYTE_LANES][LINES_PER_BYTE_LANE]; const u8 ac_delays[31]; @@ -449,7 +450,7 @@ static void mctl_set_cr(uint16_t socid, struct dram_para *para) (struct sunxi_mctl_com_reg *)SUNXI_DRAM_COM_BASE;
writel(MCTL_CR_BL8 | MCTL_CR_2T | MCTL_CR_DDR3 | MCTL_CR_INTERLEAVED | - MCTL_CR_EIGHT_BANKS | + (para->bank_bits == 3 ? MCTL_CR_EIGHT_BANKS : MCTL_CR_FOUR_BANKS) | MCTL_CR_BUS_FULL_WIDTH(para->bus_full_width) | (para->dual_rank ? MCTL_CR_DUAL_RANK : MCTL_CR_SINGLE_RANK) | MCTL_CR_PAGE_SIZE(para->page_size) | @@ -689,10 +690,19 @@ static void mctl_auto_detect_dram_size(uint16_t socid, struct dram_para *para) /* detect row address bits */ para->page_size = 512; para->row_bits = 16; + para->bank_bits = 2; mctl_set_cr(socid, para);
for (para->row_bits = 11; para->row_bits < 16; para->row_bits++) - if (mctl_mem_matches((1 << (para->row_bits + 3)) * para->page_size)) + if (mctl_mem_matches((1 << (para->row_bits + para->bank_bits)) * para->page_size)) + break; + + /* detect bank address bits */ + para->bank_bits = 3; + mctl_set_cr(socid, para); + + for (para->bank_bits = 2; para->bank_bits < 3; para->bank_bits++) + if (mctl_mem_matches((1 << para->bank_bits) * para->page_size)) break;
/* detect page size */ @@ -786,6 +796,7 @@ unsigned long sunxi_dram_init(void) .dual_rank = 0, .bus_full_width = 1, .row_bits = 15, + .bank_bits = 3, .page_size = 4096,
#if defined(CONFIG_MACH_SUN8I_H3) @@ -850,6 +861,6 @@ unsigned long sunxi_dram_init(void) mctl_auto_detect_dram_size(socid, ¶); mctl_set_cr(socid, ¶);
- return (1UL << (para.row_bits + 3)) * para.page_size * - (para.dual_rank ? 2 : 1); + return (1UL << (para.row_bits + para.bank_bits)) * para.page_size * + (para.dual_rank ? 2 : 1); }