diff options
Diffstat (limited to 'board/incaip/memsetup.S')
| -rw-r--r-- | board/incaip/memsetup.S | 131 |
1 files changed, 94 insertions, 37 deletions
diff --git a/board/incaip/memsetup.S b/board/incaip/memsetup.S index b438484..10c4e84 100644 --- a/board/incaip/memsetup.S +++ b/board/incaip/memsetup.S @@ -174,63 +174,120 @@ cgu_init: .end cgu_init - .globl memsetup - .ent memsetup -memsetup: +/* + * void sdram_init(long) + * + * a0 has the clock value + */ + .globl sdram_init + .ent sdram_init +sdram_init: - /* EBU and CGU Initialization. - */ - li a0, CPU_CLOCK_RATE - move t0, ra + li t1, MC_MODUL_BASE - /* We rely on the fact that neither ebu_init() nor cgu_init() - * modify t0 and a0. - */ - bal ebu_init + /* Disable memory controller before changing any of its registers */ + sw zero, MC_CTRLENA(t1) + + li t2, 100000000 + beq a0, t2, 1f nop - bal cgu_init + li t2, 133000000 + beq a0, t2, 2f + nop + li t2, 150000000 + beq a0, t2, 3f + nop + b 5f nop - move ra, t0 - /* SDRAM Initialization. - */ - li t0, MC_MODUL_BASE + /* 100 MHz clock */ +1: + /* Set clock ratio (clkrat=1:1, rddel=3) */ + li t2, 0x00000003 + sw t2, MC_IOGP(t1) - /* Clear Error log registers */ - sw zero, MC_ERRCAUSE(t0) - sw zero, MC_ERRADDR(t0) + /* Set sdram refresh rate (4K/64ms @ 100MHz) */ + li t2, 0x0000061A + b 4f + sw t2, MC_TREFRESH(t1) + + /* 133 MHz clock */ +2: + /* Set clock ratio (clkrat=1:1, rddel=3) */ + li t2, 0x00000003 + sw t2, MC_IOGP(t1) + + /* Set sdram refresh rate (4K/64ms @ 133MHz) */ + li t2, 0x00000822 + b 4f + sw t2, MC_TREFRESH(t1) + + /* 150 MHz clock */ +3: + /* Set clock ratio (clkrat=3:2, rddel=4) */ + li t2, 0x00000014 + sw t2, MC_IOGP(t1) + + /* Set sdram refresh rate (4K/64ms @ 150MHz) */ + li t2, 0x00000927 + sw t2, MC_TREFRESH(t1) - /* Set clock ratio to 1:1 */ - li t1, 0x03 /* clkrat=1:1, rddel=3 */ - sw t1, MC_IOGP(t0) +4: + /* Clear Error log registers */ + sw zero, MC_ERRCAUSE(t1) + sw zero, MC_ERRADDR(t1) /* Clear Power-down registers */ - sw zero, MC_SELFRFSH(t0) + sw zero, MC_SELFRFSH(t1) /* Set CAS Latency */ - li t1, 0x00000020 /* CL = 2 */ - sw t1, MC_MRSCODE(t0) + li t2, 0x00000020 /* CL = 2 */ + sw t2, MC_MRSCODE(t1) /* Set word width to 16 bit */ - li t1, 0x2 - sw t1, MC_CFGDW(t0) + li t2, 0x2 + sw t2, MC_CFGDW(t1) /* Set CS0 to SDRAM parameters */ - li t1, 0x000014C9 - sw t1, MC_CFGPB0(t0) + li t2, 0x000014C9 + sw t2, MC_CFGPB0(t1) /* Set SDRAM latency parameters */ - li t1, 0x00026325 /* BC PC100 */ - sw t1, MC_LATENCY(t0) - - /* Set SDRAM refresh rate */ - li t1, 0x00000C30 /* 4K/64ms @ 100MHz */ - sw t1, MC_TREFRESH(t0) + li t2, 0x00026325 /* BC PC100 */ + sw t2, MC_LATENCY(t1) +5: /* Finally enable the controller */ - li t1, 1 - sw t1, MC_CTRLENA(t0) + li t2, 0x00000001 + sw t2, MC_CTRLENA(t1) j ra nop + + .end sdram_init + + + .globl memsetup + .ent memsetup +memsetup: + + /* EBU, CGU and SDRAM Initialization. + */ + li a0, CPU_CLOCK_RATE + move t0, ra + + /* We rely on the fact that neither ebu_init() nor cgu_init() nor sdram_init() + * modify t0 and a0. + */ + bal cgu_init + nop + bal ebu_init + nop + bal sdram_init + nop + move ra, t0 + + j ra + nop + .end memsetup |