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author | Valentine Barshak <vbarshak@ru.mvista.com> | 2007-08-29 13:38:30 (GMT) |
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committer | Josh Boyer <jwboyer@linux.vnet.ibm.com> | 2007-09-07 12:49:28 (GMT) |
commit | 606d08bcd674073e0e505cb1eb4ff1516c3b498a (patch) | |
tree | b18ca886eb5e6e5074361523c63258d6c03ff1c0 /arch/powerpc/boot/4xx.c | |
parent | 15fc993e31293f9b179eb5f08b18a4a4f2ca648a (diff) | |
download | linux-606d08bcd674073e0e505cb1eb4ff1516c3b498a.tar.xz |
[POWERPC] PowerPC 440EPx: Sequoia bootwrapper
Bootwrapper code for AMCC PPC440EPx Sequoia.
Signed-off-by: Valentine Barshak <vbarshak@ru.mvista.com>
Acked-by: David Gibson <david@gibson.dropbear.id.au>
Signed-off-by: Josh Boyer <jwboyer@linux.vnet.ibm.com>
Diffstat (limited to 'arch/powerpc/boot/4xx.c')
-rw-r--r-- | arch/powerpc/boot/4xx.c | 108 |
1 files changed, 108 insertions, 0 deletions
diff --git a/arch/powerpc/boot/4xx.c b/arch/powerpc/boot/4xx.c index 642d878..ebf9e21 100644 --- a/arch/powerpc/boot/4xx.c +++ b/arch/powerpc/boot/4xx.c @@ -39,6 +39,114 @@ void ibm4xx_fixup_memsize(void) dt_fixup_memory(0, memsize); } +/* 4xx DDR1/2 Denali memory controller support */ +/* DDR0 registers */ +#define DDR0_02 2 +#define DDR0_08 8 +#define DDR0_10 10 +#define DDR0_14 14 +#define DDR0_42 42 +#define DDR0_43 43 + +/* DDR0_02 */ +#define DDR_START 0x1 +#define DDR_START_SHIFT 0 +#define DDR_MAX_CS_REG 0x3 +#define DDR_MAX_CS_REG_SHIFT 24 +#define DDR_MAX_COL_REG 0xf +#define DDR_MAX_COL_REG_SHIFT 16 +#define DDR_MAX_ROW_REG 0xf +#define DDR_MAX_ROW_REG_SHIFT 8 +/* DDR0_08 */ +#define DDR_DDR2_MODE 0x1 +#define DDR_DDR2_MODE_SHIFT 0 +/* DDR0_10 */ +#define DDR_CS_MAP 0x3 +#define DDR_CS_MAP_SHIFT 8 +/* DDR0_14 */ +#define DDR_REDUC 0x1 +#define DDR_REDUC_SHIFT 16 +/* DDR0_42 */ +#define DDR_APIN 0x7 +#define DDR_APIN_SHIFT 24 +/* DDR0_43 */ +#define DDR_COL_SZ 0x7 +#define DDR_COL_SZ_SHIFT 8 +#define DDR_BANK8 0x1 +#define DDR_BANK8_SHIFT 0 + +#define DDR_GET_VAL(val, mask, shift) (((val) >> (shift)) & (mask)) + +static inline u32 mfdcr_sdram0(u32 reg) +{ + mtdcr(DCRN_SDRAM0_CFGADDR, reg); + return mfdcr(DCRN_SDRAM0_CFGDATA); +} + +void ibm4xx_denali_fixup_memsize(void) +{ + u32 val, max_cs, max_col, max_row; + u32 cs, col, row, bank, dpath; + unsigned long memsize; + + val = mfdcr_sdram0(DDR0_02); + if (!DDR_GET_VAL(val, DDR_START, DDR_START_SHIFT)) + fatal("DDR controller is not initialized\n"); + + /* get maximum cs col and row values */ + max_cs = DDR_GET_VAL(val, DDR_MAX_CS_REG, DDR_MAX_CS_REG_SHIFT); + max_col = DDR_GET_VAL(val, DDR_MAX_COL_REG, DDR_MAX_COL_REG_SHIFT); + max_row = DDR_GET_VAL(val, DDR_MAX_ROW_REG, DDR_MAX_ROW_REG_SHIFT); + + /* get CS value */ + val = mfdcr_sdram0(DDR0_10); + + val = DDR_GET_VAL(val, DDR_CS_MAP, DDR_CS_MAP_SHIFT); + cs = 0; + while (val) { + if (val && 0x1) + cs++; + val = val >> 1; + } + + if (!cs) + fatal("No memory installed\n"); + if (cs > max_cs) + fatal("DDR wrong CS configuration\n"); + + /* get data path bytes */ + val = mfdcr_sdram0(DDR0_14); + + if (DDR_GET_VAL(val, DDR_REDUC, DDR_REDUC_SHIFT)) + dpath = 8; /* 64 bits */ + else + dpath = 4; /* 32 bits */ + + /* get adress pins (rows) */ + val = mfdcr_sdram0(DDR0_42); + + row = DDR_GET_VAL(val, DDR_APIN, DDR_APIN_SHIFT); + if (row > max_row) + fatal("DDR wrong APIN configuration\n"); + row = max_row - row; + + /* get collomn size and banks */ + val = mfdcr_sdram0(DDR0_43); + + col = DDR_GET_VAL(val, DDR_COL_SZ, DDR_COL_SZ_SHIFT); + if (col > max_col) + fatal("DDR wrong COL configuration\n"); + col = max_col - col; + + if (DDR_GET_VAL(val, DDR_BANK8, DDR_BANK8_SHIFT)) + bank = 8; /* 8 banks */ + else + bank = 4; /* 4 banks */ + + memsize = cs * (1 << (col+row)) * bank * dpath; + dt_fixup_memory(0, memsize); +} + #define SPRN_DBCR0_40X 0x3F2 #define SPRN_DBCR0_44X 0x134 #define DBCR0_RST_SYSTEM 0x30000000 |