diff options
Diffstat (limited to 'arch/arm')
| -rw-r--r-- | arch/arm/cpu/armv7/sunxi/dram.c | 41 |
1 files changed, 19 insertions, 22 deletions
diff --git a/arch/arm/cpu/armv7/sunxi/dram.c b/arch/arm/cpu/armv7/sunxi/dram.c index be6750d..0bbb10d 100644 --- a/arch/arm/cpu/armv7/sunxi/dram.c +++ b/arch/arm/cpu/armv7/sunxi/dram.c @@ -434,20 +434,18 @@ static void dramc_clock_output_en(u32 on) #endif } -static const u16 tRFC_table[2][6] = { - /* 256Mb 512Mb 1Gb 2Gb 4Gb 8Gb */ - /* DDR2 75ns 105ns 127.5ns 195ns 327.5ns invalid */ - { 77, 108, 131, 200, 336, 336 }, - /* DDR3 invalid 90ns 110ns 160ns 300ns 350ns */ - { 93, 93, 113, 164, 308, 359 } +/* tRFC in nanoseconds for different densities (from the DDR3 spec) */ +static const u16 tRFC_DDR3_table[6] = { + /* 256Mb 512Mb 1Gb 2Gb 4Gb 8Gb */ + 90, 90, 110, 160, 300, 350 }; -static void dramc_set_autorefresh_cycle(u32 clk, u32 type, u32 density) +static void dramc_set_autorefresh_cycle(u32 clk, u32 density) { struct sunxi_dram_reg *dram = (struct sunxi_dram_reg *)SUNXI_DRAMC_BASE; u32 tRFC, tREFI; - tRFC = (tRFC_table[type][density] * clk + 1023) >> 10; + tRFC = (tRFC_DDR3_table[density] * clk + 999) / 1000; tREFI = (7987 * clk) >> 10; /* <= 7.8us */ writel(DRAM_DRR_TREFI(tREFI) | DRAM_DRR_TRFC(tRFC), &dram->drr); @@ -570,6 +568,13 @@ unsigned long dramc_init(struct dram_para *para) if (!para) return 0; + /* + * only single rank DDR3 is supported by this code even though the + * hardware can theoretically support DDR2 and up to two ranks + */ + if (para->type != DRAM_MEMORY_TYPE_DDR3 || para->rank_num != 1) + return 0; + /* setup DRAM relative clock */ mctl_setup_dram_clock(para->clock, para->mbus_clock); @@ -590,9 +595,7 @@ unsigned long dramc_init(struct dram_para *para) mctl_enable_dll0(para->tpr3); /* configure external DRAM */ - reg_val = 0x0; - if (para->type == DRAM_MEMORY_TYPE_DDR3) - reg_val |= DRAM_DCR_TYPE_DDR3; + reg_val = DRAM_DCR_TYPE_DDR3; reg_val |= DRAM_DCR_IO_WIDTH(para->io_width >> 3); if (para->density == 256) @@ -632,25 +635,19 @@ unsigned long dramc_init(struct dram_para *para) mctl_enable_dllx(para->tpr3); /* set refresh period */ - dramc_set_autorefresh_cycle(para->clock, para->type - 2, density); + dramc_set_autorefresh_cycle(para->clock, density); /* set timing parameters */ writel(para->tpr0, &dram->tpr0); writel(para->tpr1, &dram->tpr1); writel(para->tpr2, &dram->tpr2); - if (para->type == DRAM_MEMORY_TYPE_DDR3) { - reg_val = DRAM_MR_BURST_LENGTH(0x0); + reg_val = DRAM_MR_BURST_LENGTH(0x0); #if (defined(CONFIG_SUN5I) || defined(CONFIG_SUN7I)) - reg_val |= DRAM_MR_POWER_DOWN; + reg_val |= DRAM_MR_POWER_DOWN; #endif - reg_val |= DRAM_MR_CAS_LAT(para->cas - 4); - reg_val |= DRAM_MR_WRITE_RECOVERY(0x5); - } else if (para->type == DRAM_MEMORY_TYPE_DDR2) { - reg_val = DRAM_MR_BURST_LENGTH(0x2); - reg_val |= DRAM_MR_CAS_LAT(para->cas); - reg_val |= DRAM_MR_WRITE_RECOVERY(0x5); - } + reg_val |= DRAM_MR_CAS_LAT(para->cas - 4); + reg_val |= DRAM_MR_WRITE_RECOVERY(0x5); writel(reg_val, &dram->mr); writel(para->emr1, &dram->emr); |