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authorGary Jennejohn <garyj@pollux.denx.de>2007-01-24 12:16:56 +0100
committerGary Jennejohn <garyj@pollux.denx.de>2007-01-24 12:16:56 +0100
commit6bd2447ee47ee23c18d2b3c7ccd5a20f7626f5b3 (patch)
treeb002914fc995346cb06a8f79dbb100c5e9164cd6 /cpu/arm720t/start.S
parentb78bb469f536b357ee21c54f40201dbe4b201ac3 (diff)
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Add port for the lpc2292sodimm evaluation board from EmbeddedArtists
Diffstat (limited to 'cpu/arm720t/start.S')
-rw-r--r--cpu/arm720t/start.S69
1 files changed, 69 insertions, 0 deletions
diff --git a/cpu/arm720t/start.S b/cpu/arm720t/start.S
index e66d109..96d5f54 100644
--- a/cpu/arm720t/start.S
+++ b/cpu/arm720t/start.S
@@ -43,7 +43,11 @@ _start: b reset
ldr pc, _software_interrupt
ldr pc, _prefetch_abort
ldr pc, _data_abort
+#ifdef CONFIG_LPC2292
+ .word 0xB4405F76 /* 2's complement of the checksum of the vectors */
+#else
ldr pc, _not_used
+#endif
ldr pc, _irq
ldr pc, _fiq
@@ -123,6 +127,10 @@ reset:
bl cpu_init_crit
#endif
+#ifdef CONFIG_LPC2292
+ bl lowlevel_init
+#endif
+
#ifndef CONFIG_SKIP_RELOCATE_UBOOT
relocate: /* relocate U-Boot to RAM */
adr r0, _start /* r0 <- current position of code */
@@ -131,6 +139,7 @@ relocate: /* relocate U-Boot to RAM */
beq stack_setup
#if TEXT_BASE
+#ifndef CONFIG_LPC2292 /* already done in lowlevel_init */
ldr r2, =0x0 /* Relocate the exception vectors */
cmp r1, r2 /* and associated data to address */
ldmneia r0!, {r3-r10} /* 0x0. Do nothing if TEXT_BASE is */
@@ -138,6 +147,7 @@ relocate: /* relocate U-Boot to RAM */
ldmneia r0, {r3-r9}
stmneia r2, {r3-r9}
adrne r0, _start /* restore r0 */
+#endif /* !CONFIG_LPC2292 */
#endif
ldr r2, _armboot_start
@@ -206,6 +216,14 @@ SYSCON3: .word 0x80002200
#define CLKCTL_49 0x4 /* 49.152 MHz */
#define CLKCTL_73 0x6 /* 73.728 MHz */
+#elif defined(CONFIG_LPC2292)
+PLLCFG_ADR: .word PLLCFG
+PLLFEED_ADR: .word PLLFEED
+PLLCON_ADR: .word PLLCON
+PLLSTAT_ADR: .word PLLSTAT
+VPBDIV_ADR: .word VPBDIV
+MEMMAP_ADR: .word MEMMAP
+
#endif
cpu_init_crit:
@@ -306,6 +324,50 @@ cpu_init_crit:
#elif defined(CONFIG_INTEGRATOR) && defined(CONFIG_ARCH_INTEGRATOR)
/* No specific initialisation for IntegratorAP/CM720T as yet */
+#elif defined(CONFIG_LPC2292)
+ /* Set-up PLL */
+ mov r3, #0xAA
+ mov r4, #0x55
+ /* First disconnect and disable the PLL */
+ ldr r0, PLLCON_ADR
+ mov r1, #0x00
+ str r1, [r0]
+ ldr r0, PLLFEED_ADR /* start feed sequence */
+ str r3, [r0]
+ str r4, [r0] /* feed sequence done */
+ /* Set new M and P values */
+ ldr r0, PLLCFG_ADR
+ mov r1, #0x23 /* M=4 and P=2 */
+ str r1, [r0]
+ ldr r0, PLLFEED_ADR /* start feed sequence */
+ str r3, [r0]
+ str r4, [r0] /* feed sequence done */
+ /* Then enable the PLL */
+ ldr r0, PLLCON_ADR
+ mov r1, #0x01 /* PLL enable bit */
+ str r1, [r0]
+ ldr r0, PLLFEED_ADR /* start feed sequence */
+ str r3, [r0]
+ str r4, [r0] /* feed sequence done */
+ /* Wait for the lock */
+ ldr r0, PLLSTAT_ADR
+ mov r1, #0x400 /* lock bit */
+lock_loop:
+ ldr r2, [r0]
+ and r2, r1, r2
+ cmp r2, #0
+ beq lock_loop
+ /* And finally connect the PLL */
+ ldr r0, PLLCON_ADR
+ mov r1, #0x03 /* PLL enable bit and connect bit */
+ str r1, [r0]
+ ldr r0, PLLFEED_ADR /* start feed sequence */
+ str r3, [r0]
+ str r4, [r0] /* feed sequence done */
+ /* Set-up VPBDIV register */
+ ldr r0, VPBDIV_ADR
+ mov r1, #0x01 /* VPB clock is same as process clock */
+ str r1, [r0]
#else
#error No cpu_init_crit() defined for current CPU type
#endif
@@ -321,6 +383,7 @@ cpu_init_crit:
str r1, [r0]
#endif
+#ifndef CONFIG_LPC2292
mov ip, lr
/*
* before relocating, we have to setup RAM timing
@@ -329,6 +392,7 @@ cpu_init_crit:
*/
bl lowlevel_init
mov lr, ip
+#endif
mov pc, lr
@@ -537,6 +601,11 @@ reset_cpu:
* on external peripherals such as watchdog timers, etc. */
#elif defined(CONFIG_INTEGRATOR) && defined(CONFIG_ARCH_INTEGRATOR)
/* No specific reset actions for IntegratorAP/CM720T as yet */
+#elif defined(CONFIG_LPC2292)
+ .align 5
+.globl reset_cpu
+reset_cpu:
+ mov pc, r0
#else
#error No reset_cpu() defined for current CPU type
#endif