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-rw-r--r--arch/m68knommu/platform/68328/head-ram.S171
1 files changed, 171 insertions, 0 deletions
diff --git a/arch/m68knommu/platform/68328/head-ram.S b/arch/m68knommu/platform/68328/head-ram.S
new file mode 100644
index 000000000000..6bdc9bce43f2
--- /dev/null
+++ b/arch/m68knommu/platform/68328/head-ram.S
@@ -0,0 +1,171 @@
+#include <linux/config.h>
+
+ .global __main
+ .global __ram_start
+ .global __ram_end
+ .global __rom_start
+ .global __rom_end
+
+ .global _rambase
+ .global _ramstart
+
+ .global splash_bits
+ .global _start
+ .global _stext
+
+#define DEBUG
+#define ROM_OFFSET 0x10C00000
+#define STACK_GAURD 0x10
+
+ .text
+
+_start:
+_stext:
+ movew #0x2700, %sr /* Exceptions off! */
+
+#if 0
+ /* Init chip registers. uCsimm specific */
+ moveb #0x00, 0xfffffb0b /* Watchdog off */
+ moveb #0x10, 0xfffff000 /* SCR */
+
+ movew #0x2400, 0xfffff200 /* PLLCR */
+ movew #0x0123, 0xfffff202 /* PLLFSR */
+
+ moveb #0x00, 0xfffff40b /* enable chip select */
+ moveb #0x00, 0xfffff423 /* enable /DWE */
+ moveb #0x08, 0xfffffd0d /* disable hardmap */
+ moveb #0x07, 0xfffffd0e /* level 7 interrupt clear */
+
+ movew #0x8600, 0xfffff100 /* FLASH at 0x10c00000 */
+ movew #0x018b, 0xfffff110 /* 2Meg, enable, 0ws */
+
+ movew #0x8f00, 0xfffffc00 /* DRAM configuration */
+ movew #0x9667, 0xfffffc02 /* DRAM control */
+ movew #0x0000, 0xfffff106 /* DRAM at 0x00000000 */
+ movew #0x068f, 0xfffff116 /* 8Meg, enable, 0ws */
+
+ moveb #0x40, 0xfffff300 /* IVR */
+ movel #0x007FFFFF, %d0 /* IMR */
+ movel %d0, 0xfffff304
+
+ moveb 0xfffff42b, %d0
+ andb #0xe0, %d0
+ moveb %d0, 0xfffff42b
+
+ moveb #0x08, 0xfffff907 /* Ignore CTS */
+ movew #0x010b, 0xfffff902 /* BAUD to 9600 */
+ movew #0xe100, 0xfffff900 /* enable */
+#endif
+
+ movew #16384, %d0 /* PLL settle wait loop */
+L0:
+ subw #1, %d0
+ bne L0
+#ifdef DEBUG
+ moveq #70, %d7 /* 'F' */
+ moveb %d7,0xfffff907 /* No absolute addresses */
+pclp1:
+ movew 0xfffff906, %d7
+ andw #0x2000, %d7
+ beq pclp1
+#endif /* DEBUG */
+
+#ifdef CONFIG_RELOCATE
+ /* Copy me to RAM */
+ moveal #__rom_start, %a0
+ moveal #__ram_start, %a1
+ moveal #_edata, %a2
+
+ /* Copy %a0 to %a1 until %a1 == %a2 */
+LD1:
+ movel %a0@+, %d0
+ movel %d0, %a1@+
+ cmpal %a1, %a2
+ bhi LD1
+
+#ifdef DEBUG
+ moveq #74, %d7 /* 'J' */
+ moveb %d7,0xfffff907 /* No absolute addresses */
+pclp2:
+ movew 0xfffff906, %d7
+ andw #0x2000, %d7
+ beq pclp2
+#endif /* DEBUG */
+ /* jump into the RAM copy */
+ jmp ram_jump
+ram_jump:
+
+#endif /* CONFIG_RELOCATE */
+
+#ifdef DEBUG
+ moveq #82, %d7 /* 'R' */
+ moveb %d7,0xfffff907 /* No absolute addresses */
+pclp3:
+ movew 0xfffff906, %d7
+ andw #0x2000, %d7
+ beq pclp3
+#endif /* DEBUG */
+ moveal #0x007ffff0, %ssp
+ moveal #_sbss, %a0
+ moveal #_ebss, %a1
+
+ /* Copy 0 to %a0 until %a0 >= %a1 */
+L1:
+ movel #0, %a0@+
+ cmpal %a0, %a1
+ bhi L1
+
+#ifdef DEBUG
+ moveq #67, %d7 /* 'C' */
+ jsr putc
+#endif /* DEBUG */
+
+ pea 0
+ pea env
+ pea %sp@(4)
+ pea 0
+
+#ifdef DEBUG
+ moveq #70, %d7 /* 'F' */
+ jsr putc
+#endif /* DEBUG */
+
+lp:
+ jsr start_kernel
+ jmp lp
+_exit:
+
+ jmp _exit
+
+__main:
+ /* nothing */
+ rts
+
+#ifdef DEBUG
+putc:
+ moveb %d7,0xfffff907
+pclp:
+ movew 0xfffff906, %d7
+ andw #0x2000, %d7
+ beq pclp
+ rts
+#endif /* DEBUG */
+
+ .data
+
+/*
+ * Set up the usable of RAM stuff. Size of RAM is determined then
+ * an initial stack set up at the end.
+ */
+.align 4
+_ramvec:
+.long 0
+_rambase:
+.long 0
+_ramstart:
+.long 0
+_ramend:
+.long 0
+
+env:
+ .long 0