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-rw-r--r--board/incaip/memsetup.S131
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