diff options
Diffstat (limited to 'cpu/sa1100/cpu.c')
| -rw-r--r-- | cpu/sa1100/cpu.c | 45 |
1 files changed, 17 insertions, 28 deletions
diff --git a/cpu/sa1100/cpu.c b/cpu/sa1100/cpu.c index bb4e5a1..d0dfa3d 100644 --- a/cpu/sa1100/cpu.c +++ b/cpu/sa1100/cpu.c @@ -32,6 +32,7 @@ #include <common.h> #include <command.h> +#include <asm/system.h> #ifdef CONFIG_USE_IRQ DECLARE_GLOBAL_DATA_PTR; @@ -85,47 +86,35 @@ int do_reset (cmd_tbl_t *cmdtp, int flag, int argc, char *argv[]) return (0); } -/* taken from blob */ -void icache_enable (void) +static void cp_delay (void) { - register u32 i; + volatile int i; - /* read control register */ - asm ("mrc p15, 0, %0, c1, c0, 0":"=r" (i)); + /* copro seems to need some delay between reading and writing */ + for (i = 0; i < 100; i++); +} - /* set i-cache */ - i |= 0x1000; +void icache_enable (void) +{ + ulong reg; - /* write back to control register */ - asm ("mcr p15, 0, %0, c1, c0, 0": :"r" (i)); + reg = get_cr (); + cp_delay (); + set_cr (reg | CR_C); } void icache_disable (void) { - register u32 i; - - /* read control register */ - asm ("mrc p15, 0, %0, c1, c0, 0":"=r" (i)); + ulong reg; - /* clear i-cache */ - i &= ~0x1000; - - /* write back to control register */ - asm ("mcr p15, 0, %0, c1, c0, 0": :"r" (i)); - - /* flush i-cache */ - asm ("mcr p15, 0, %0, c7, c5, 0": :"r" (i)); + reg = get_cr (); + cp_delay (); + set_cr (reg & ~CR_C); } int icache_status (void) { - register u32 i; - - /* read control register */ - asm ("mrc p15, 0, %0, c1, c0, 0":"=r" (i)); - - /* return bit */ - return (i & 0x1000); + return (get_cr () & CR_C) != 0; } /* we will never enable dcache, because we have to setup MMU first */ |