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-rw-r--r--board/incaip/memsetup.S183
1 files changed, 132 insertions, 51 deletions
diff --git a/board/incaip/memsetup.S b/board/incaip/memsetup.S
index 245ab72..70d2885 100644
--- a/board/incaip/memsetup.S
+++ b/board/incaip/memsetup.S
@@ -55,63 +55,142 @@
#define CGU_MUXCR(value) 0x0014(value)
#define CGU_PLL1SR(value) 0x000C(value)
- .globl memsetup
-memsetup:
+ .set noreorder
- /* EBU Initialization for the Flash CS0 and CS2.
- */
- li t0, EBU_MODUL_BASE
- li t1, 0xA0000041
- sw t1, EBU_ADDSEL0(t0)
+/*
+ * void ebu_init(long)
+ *
+ * a0 has the clock value we are going to run at
+ */
+ .globl ebu_init
+ .ent ebu_init
+ebu_init:
+
+ li t1, EBU_MODUL_BASE
+ li t2, 0xA0000041
+ sw t2, EBU_ADDSEL0(t1)
+ li t2, 0xA0800041
+ sw t2, EBU_ADDSEL2(t1)
+ li t2, 0xBE0000F1
+ sw t2, EBU_ADDSEL1(t1)
+
+ li t3, 100000000
+ beq a0, t3, 1f
+ nop
+ li t3, 133000000
+ beq a0, t3, 2f
+ nop
+ li t3, 150000000
+ beq a0, t3, 2f
+ nop
+ b 3f
+ nop
-#if CPU_CLOCK_RATE==100000000 /* 100 MHz clock for the MIPS core */
- lw t1, EBU_BUSCON0(t0) /* value set up by magic flash word */
- sw t1, EBU_BUSCON2(t0)
-#else /* 150 MHz or 133 MHz */
- li t1, 0x8841417E
- sw t1, EBU_BUSCON0(t0)
- sw t1, EBU_BUSCON2(t0)
-#endif
+ /* 100 MHz */
+1:
+ li t2, 0x8841417D
+ sw t2, EBU_BUSCON0(t1)
+ sw t2, EBU_BUSCON2(t1)
+ li t2, 0x684142BD
+ b 3f
+ sw t2, EBU_BUSCON1(t1) /* delay slot */
+
+ /* 133 or 150 MHz */
+2:
+ li t2, 0x8841417E
+ sw t2, EBU_BUSCON0(t1)
+ sw t2, EBU_BUSCON2(t1)
+ li t2, 0x684143FD
+ sw t2, EBU_BUSCON1(t1)
+3:
+ j ra
+ nop
+
+ .end ebu_init
- li t1, 0xA0800041
- sw t1, EBU_ADDSEL2(t0)
- /* Need to initialize CS1 too, so as to to prevent overlapping with
- * Flash bank 1.
+/*
+ * void cgu_init(long)
+ *
+ * a0 has the clock value
+ */
+ .globl cgu_init
+ .ent cgu_init
+cgu_init:
+
+ li t1, CGU_MODUL_BASE
+
+ li t3, 100000000
+ beq a0, t3, 1f
+ nop
+ li t3, 133000000
+ beq a0, t3, 2f
+ nop
+ li t3, 150000000
+ beq a0, t3, 3f
+ nop
+ b 5f
+ nop
+
+ /* 100 MHz clock */
+1:
+ li t2, 0x80000014
+ sw t2, CGU_DIVCR(t1)
+ li t2, 0x80000000
+ sw t2, CGU_MUXCR(t1)
+ li t2, 0x800B0001
+ b 5f
+ sw t2, CGU_PLL1CR(t1) /* delay slot */
+
+ /* 133 MHz clock */
+2:
+ li t2, 0x80000054
+ sw t2, CGU_DIVCR(t1)
+ li t2, 0x80000000
+ sw t2, CGU_MUXCR(t1)
+ li t2, 0x800B0001
+ b 5f
+ sw t2, CGU_PLL1CR(t1) /* delay slot */
+
+ /* 150 MHz clock */
+3:
+ li t2, 0x80000017
+ sw t2, CGU_DIVCR(t1)
+ li t2, 0xC00B0001
+ sw t2, CGU_PLL1CR(t1)
+ li t3, 0x80000000
+4:
+ lw t2, CGU_PLL1SR(t1)
+ and t2, t2, t3
+ beq t2, zero, 4b
+ nop
+ li t2, 0x80000001
+ sw t2, CGU_MUXCR(t1)
+5:
+ j ra
+ nop
+
+ .end cgu_init
+
+
+ .globl memsetup
+ .ent memsetup
+memsetup:
+
+ /* EBU and CGU Initialization.
*/
- li t1, 0xBE0000F1
- sw t1, EBU_ADDSEL1(t0)
-
-#if CPU_CLOCK_RATE==100000000 /* 100 MHz clock for the MIPS core */
- li t1, 0x684142BD
-#else /* 150 MHz or 133 MHz */
- li t1, 0x684143FD
-#endif
- sw t1, EBU_BUSCON1(t0)
-
-#if CPU_CLOCK_RATE==150000000 /* 150 MHz clock for the MIPS core */
- li t0, CGU_MODUL_BASE
- li t1, 0x80000017
- sw t1, CGU_DIVCR(t0)
- li t1, 0xC00B0001
- sw t1, CGU_PLL1CR(t0)
- lui t2, 0x8000
-b1:
- lw t1, CGU_PLL1SR(t0)
- and t1, t1, t2
- beq t1, zero, b1
- li t1, 0x80000001
- sw t1, CGU_MUXCR(t0)
-#elif CPU_CLOCK_RATE==133000000 /* 133 MHz clock for the MIPS core */
- li t0, CGU_MODUL_BASE
- li t1, 0x80000054
- sw t1, CGU_DIVCR(t0)
- li t1, 0x80000000
- sw t1, CGU_MUXCR(t0)
- li t1, 0x800B0001
- sw t1, CGU_PLL1CR(t0)
-#endif
+ li a0, CPU_CLOCK_RATE
+ move t0, ra
+
+ /* We rely on the fact that neither ebu_init() nor cgu_init()
+ * modify t0 and a0.
+ */
+ bal ebu_init
+ nop
+ bal cgu_init
+ nop
+ move ra, t0
/* SDRAM Initialization.
*/
@@ -154,3 +233,5 @@ b1:
j ra
nop
+ .end memsetup
+