Merge branch 'master' of rsync://rsync.denx.de/git/u-boot

[platform/kernel/u-boot.git] / cpu / arm920t / cpu.c

diff --git a/cpu/arm920t/cpu.c b/cpu/arm920t/cpu.c
index e638c1f..f93bf57 100644 (file)
--- a/cpu/arm920t/cpu.c
+++ b/cpu/arm920t/cpu.c
@@ -33,13 +33,17 @@
 #include <command.h>
 #include <arm920t.h>
 
+#ifdef CONFIG_USE_IRQ
+DECLARE_GLOBAL_DATA_PTR;
+#endif
+
 /* read co-processor 15, register #1 (control register) */
 static unsigned long read_p15_c1 (void)
 {
        unsigned long value;
 
        __asm__ __volatile__(
-               "mrc     p15, 0, %0, c1, c0, 0   @ read control reg\n"
+               "mrc    p15, 0, %0, c1, c0, 0   @ read control reg\n"
                : "=r" (value)
                :
                : "memory");
@@ -57,7 +61,7 @@ static void write_p15_c1 (unsigned long value)
        printf ("write %08lx to p15/c1\n", value);
 #endif
        __asm__ __volatile__(
-               "mcr     p15, 0, %0, c1, c0, 0   @ write it back\n"
+               "mcr    p15, 0, %0, c1, c0, 0   @ write it back\n"
                :
                : "r" (value)
                : "memory");
@@ -73,16 +77,17 @@ static void cp_delay (void)
        for (i = 0; i < 100; i++);
 }
 
-/* See also ARM Ref. Man. */
+/* See also ARM920T    Technical reference Manual */
 #define C1_MMU         (1<<0)          /* mmu off/on */
 #define C1_ALIGN       (1<<1)          /* alignment faults off/on */
 #define C1_DC          (1<<2)          /* dcache off/on */
-#define C1_BIG_ENDIAN  (1<<7)  /* big endian off/on */
+
+#define C1_BIG_ENDIAN  (1<<7)          /* big endian off/on */
 #define C1_SYS_PROT    (1<<8)          /* system protection */
 #define C1_ROM_PROT    (1<<9)          /* ROM protection */
 #define C1_IC          (1<<12)         /* icache off/on */
-#define C1_HIGH_VECTORS        (1<<13) /* location of vectors: low/high addresses */
-#define RESERVED_1     (0xf << 3)      /* must be 111b for R/W */
+#define C1_HIGH_VECTORS        (1<<13)         /* location of vectors: low/high addresses */
+
 
 int cpu_init (void)
 {
@@ -90,9 +95,7 @@ int cpu_init (void)
         * setup up stacks if necessary
         */
 #ifdef CONFIG_USE_IRQ
-       DECLARE_GLOBAL_DATA_PTR;
-
-       IRQ_STACK_START = _armboot_start - CFG_MALLOC_LEN - CFG_GBL_DATA_LEN - 4;
+       IRQ_STACK_START = _armboot_start - CFG_MALLOC_LEN - CFG_GBL_DATA_SIZE - 4;
        FIQ_STACK_START = IRQ_STACK_START - CONFIG_STACKSIZE_IRQ;
 #endif
        return 0;
@@ -119,13 +122,12 @@ int cleanup_before_linux (void)
        /* flush I/D-cache */
        i = 0;
        asm ("mcr p15, 0, %0, c7, c7, 0": :"r" (i));
+
        return (0);
 }
 
 int do_reset (cmd_tbl_t *cmdtp, int flag, int argc, char *argv[])
 {
-       extern void reset_cpu (ulong addr);
-
        disable_interrupts ();
        reset_cpu (0);
        /*NOTREACHED*/
@@ -136,7 +138,7 @@ void icache_enable (void)
 {
        ulong reg;
 
-       reg = read_p15_c1 ();
+       reg = read_p15_c1 ();           /* get control reg. */
        cp_delay ();
        write_p15_c1 (reg | C1_IC);
 }