From 677e62f43235de9a1701204d7bcea0fb3d233fa1 Mon Sep 17 00:00:00 2001 From: Jean-Christophe PLAGNIOL-VILLARD Date: Sun, 5 Apr 2009 13:02:43 +0200 Subject: arm: update co-processor 15 access import system.h from linux Signed-off-by: Jean-Christophe PLAGNIOL-VILLARD --- cpu/arm920t/cpu.c | 69 +++++++++++-------------------------------------------- 1 file changed, 13 insertions(+), 56 deletions(-) (limited to 'cpu/arm920t') diff --git a/cpu/arm920t/cpu.c b/cpu/arm920t/cpu.c index 1b9cde6..83ee3f3 100644 --- a/cpu/arm920t/cpu.c +++ b/cpu/arm920t/cpu.c @@ -32,43 +32,12 @@ #include #include #include +#include #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" - : "=r" (value) - : - : "memory"); - -#ifdef MMU_DEBUG - printf ("p15/c1 is = %08lx\n", value); -#endif - return value; -} - -/* write to co-processor 15, register #1 (control register) */ -static void write_p15_c1 (unsigned long value) -{ -#ifdef MMU_DEBUG - printf ("write %08lx to p15/c1\n", value); -#endif - __asm__ __volatile__( - "mcr p15, 0, %0, c1, c0, 0 @ write it back\n" - : - : "r" (value) - : "memory"); - - read_p15_c1 (); -} - static void cp_delay (void) { volatile int i; @@ -77,18 +46,6 @@ static void cp_delay (void) for (i = 0; i < 100; i++); } -/* 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_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 */ - - int cpu_init (void) { /* @@ -116,7 +73,7 @@ int cleanup_before_linux (void) /* turn off I/D-cache */ asm ("mrc p15, 0, %0, c1, c0, 0":"=r" (i)); - i &= ~(C1_DC | C1_IC); + i &= ~(CR_C | CR_I); asm ("mcr p15, 0, %0, c1, c0, 0": :"r" (i)); /* flush I/D-cache */ @@ -138,23 +95,23 @@ void icache_enable (void) { ulong reg; - reg = read_p15_c1 (); /* get control reg. */ + reg = get_cr (); /* get control reg. */ cp_delay (); - write_p15_c1 (reg | C1_IC); + set_cr (reg | CR_I); } void icache_disable (void) { ulong reg; - reg = read_p15_c1 (); + reg = get_cr (); cp_delay (); - write_p15_c1 (reg & ~C1_IC); + set_cr (reg & ~CR_I); } int icache_status (void) { - return (read_p15_c1 () & C1_IC) != 0; + return (get_cr () & CR_I) != 0; } #ifdef USE_920T_MMU @@ -163,23 +120,23 @@ void dcache_enable (void) { ulong reg; - reg = read_p15_c1 (); + reg = get_cr (); cp_delay (); - write_p15_c1 (reg | C1_DC); + set_cr (reg | CR_C); } void dcache_disable (void) { ulong reg; - reg = read_p15_c1 (); + reg = get_cr (); cp_delay (); - reg &= ~C1_DC; - write_p15_c1 (reg); + reg &= ~CR_C; + set_cr (reg); } int dcache_status (void) { - return (read_p15_c1 () & C1_DC) != 0; + return (get_cr () & CR_C) != 0; } #endif -- cgit v1.1 From b3acb6cd4059dfb29a5e99095d802717f53ff784 Mon Sep 17 00:00:00 2001 From: Jean-Christophe PLAGNIOL-VILLARD Date: Sun, 5 Apr 2009 13:06:31 +0200 Subject: arm: clean cache management unify arm cache management except for non standard cache as ARM7TDMI Signed-off-by: Jean-Christophe PLAGNIOL-VILLARD --- cpu/arm920t/cpu.c | 73 ++++++++----------------------------------------------- 1 file changed, 10 insertions(+), 63 deletions(-) (limited to 'cpu/arm920t') diff --git a/cpu/arm920t/cpu.c b/cpu/arm920t/cpu.c index 83ee3f3..08c9339 100644 --- a/cpu/arm920t/cpu.c +++ b/cpu/arm920t/cpu.c @@ -38,13 +38,7 @@ DECLARE_GLOBAL_DATA_PTR; #endif -static void cp_delay (void) -{ - volatile int i; - - /* copro seems to need some delay between reading and writing */ - for (i = 0; i < 100; i++); -} +static void cache_flush(void); int cpu_init (void) { @@ -67,20 +61,15 @@ int cleanup_before_linux (void) * we turn off caches etc ... */ - unsigned long i; - disable_interrupts (); /* turn off I/D-cache */ - asm ("mrc p15, 0, %0, c1, c0, 0":"=r" (i)); - i &= ~(CR_C | CR_I); - asm ("mcr p15, 0, %0, c1, c0, 0": :"r" (i)); - + icache_disable(); + dcache_disable(); /* flush I/D-cache */ - i = 0; - asm ("mcr p15, 0, %0, c7, c7, 0": :"r" (i)); + cache_flush(); - return (0); + return 0; } int do_reset (cmd_tbl_t *cmdtp, int flag, int argc, char *argv[]) @@ -88,55 +77,13 @@ int do_reset (cmd_tbl_t *cmdtp, int flag, int argc, char *argv[]) disable_interrupts (); reset_cpu (0); /*NOTREACHED*/ - return (0); -} - -void icache_enable (void) -{ - ulong reg; - - reg = get_cr (); /* get control reg. */ - cp_delay (); - set_cr (reg | CR_I); -} - -void icache_disable (void) -{ - ulong reg; - - reg = get_cr (); - cp_delay (); - set_cr (reg & ~CR_I); -} - -int icache_status (void) -{ - return (get_cr () & CR_I) != 0; -} - -#ifdef USE_920T_MMU -/* It makes no sense to use the dcache if the MMU is not enabled */ -void dcache_enable (void) -{ - ulong reg; - - reg = get_cr (); - cp_delay (); - set_cr (reg | CR_C); + return 0; } -void dcache_disable (void) +/* flush I/D-cache */ +static void cache_flush (void) { - ulong reg; - - reg = get_cr (); - cp_delay (); - reg &= ~CR_C; - set_cr (reg); -} + unsigned long i = 0; -int dcache_status (void) -{ - return (get_cr () & CR_C) != 0; + asm ("mcr p15, 0, %0, c7, c7, 0": :"r" (i)); } -#endif -- cgit v1.1 From ab298231518675b3784aea88ee9b978438f99e63 Mon Sep 17 00:00:00 2001 From: Jean-Christophe PLAGNIOL-VILLARD Date: Sun, 5 Apr 2009 13:08:03 +0200 Subject: arm: unify reset command Signed-off-by: Jean-Christophe PLAGNIOL-VILLARD --- cpu/arm920t/cpu.c | 8 -------- 1 file changed, 8 deletions(-) (limited to 'cpu/arm920t') diff --git a/cpu/arm920t/cpu.c b/cpu/arm920t/cpu.c index 08c9339..87c1adc 100644 --- a/cpu/arm920t/cpu.c +++ b/cpu/arm920t/cpu.c @@ -72,14 +72,6 @@ int cleanup_before_linux (void) return 0; } -int do_reset (cmd_tbl_t *cmdtp, int flag, int argc, char *argv[]) -{ - disable_interrupts (); - reset_cpu (0); - /*NOTREACHED*/ - return 0; -} - /* flush I/D-cache */ static void cache_flush (void) { -- cgit v1.1