diff options
Diffstat (limited to 'cpu/bf537/cpu.c')
| -rw-r--r-- | cpu/bf537/cpu.c | 227 |
1 files changed, 227 insertions, 0 deletions
diff --git a/cpu/bf537/cpu.c b/cpu/bf537/cpu.c new file mode 100644 index 0000000000..cb8dc3cd16 --- /dev/null +++ b/cpu/bf537/cpu.c @@ -0,0 +1,227 @@ +/* + * U-boot - cpu.c CPU specific functions + * + * Copyright (c) 2005 blackfin.uclinux.org + * + * (C) Copyright 2000-2004 + * Wolfgang Denk, DENX Software Engineering, wd@denx.de. + * + * See file CREDITS for list of people who contributed to this + * project. + * + * This program is free software; you can redistribute it and/or + * modify it under the terms of the GNU General Public License as + * published by the Free Software Foundation; either version 2 of + * the License, or (at your option) any later version. + * + * This program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU General Public License for more details. + * + * You should have received a copy of the GNU General Public License + * along with this program; if not, write to the Free Software + * Foundation, Inc., 59 Temple Place, Suite 330, Boston, + * MA 02111-1307 USA + */ + +#include <common.h> +#include <asm/blackfin.h> +#include <command.h> +#include <asm/entry.h> +#include <asm/cplb.h> +#include <asm/io.h> + +#define CACHE_ON 1 +#define CACHE_OFF 0 + +extern unsigned int icplb_table[page_descriptor_table_size][2]; +extern unsigned int dcplb_table[page_descriptor_table_size][2]; + +int do_reset(cmd_tbl_t * cmdtp, int flag, int argc, char *argv[]) +{ + __asm__ __volatile__("cli r3;" "P0 = %0;" "JUMP (P0);"::"r"(L1_ISRAM) + ); + + return 0; +} + +/* These functions are just used to satisfy the linker */ +int cpu_init(void) +{ + return 0; +} + +int cleanup_before_linux(void) +{ + return 0; +} + +void icache_enable(void) +{ + unsigned int *I0, *I1; + int i, j = 0; + + if ((*pCHIPID >> 28) < 2) + return; + + /* Before enable icache, disable it first */ + icache_disable(); + I0 = (unsigned int *)ICPLB_ADDR0; + I1 = (unsigned int *)ICPLB_DATA0; + + /* make sure the locked ones go in first */ + for (i = 0; i < page_descriptor_table_size; i++) { + if (CPLB_LOCK & icplb_table[i][1]) { + debug("adding %02i %02i 0x%08x 0x%08x\n", i, j, + icplb_table[i][0], icplb_table[i][1]); + *I0++ = icplb_table[i][0]; + *I1++ = icplb_table[i][1]; + j++; + } + } + + for (i = 0; i < page_descriptor_table_size; i++) { + if (!(CPLB_LOCK & icplb_table[i][1])) { + debug("adding %02i %02i 0x%08x 0x%08x\n", i, j, + icplb_table[i][0], icplb_table[i][1]); + *I0++ = icplb_table[i][0]; + *I1++ = icplb_table[i][1]; + j++; + if (j == 16) { + break; + } + } + } + + /* Fill the rest with invalid entry */ + if (j <= 15) { + for (; j < 16; j++) { + debug("filling %i with 0", j); + *I1++ = 0x0; + } + + } + + cli(); + sync(); + asm(" .align 8; "); + *(unsigned int *)IMEM_CONTROL = IMC | ENICPLB; + sync(); + sti(); +} + +void icache_disable(void) +{ + if ((*pCHIPID >> 28) < 2) + return; + cli(); + sync(); + asm(" .align 8; "); + *(unsigned int *)IMEM_CONTROL &= ~(IMC | ENICPLB); + sync(); + sti(); +} + +int icache_status(void) +{ + unsigned int value; + value = *(unsigned int *)IMEM_CONTROL; + + if (value & (IMC | ENICPLB)) + return CACHE_ON; + else + return CACHE_OFF; +} + +void dcache_enable(void) +{ + unsigned int *I0, *I1; + unsigned int temp; + int i, j = 0; + + /* Before enable dcache, disable it first */ + dcache_disable(); + I0 = (unsigned int *)DCPLB_ADDR0; + I1 = (unsigned int *)DCPLB_DATA0; + + /* make sure the locked ones go in first */ + for (i = 0; i < page_descriptor_table_size; i++) { + if (CPLB_LOCK & dcplb_table[i][1]) { + debug("adding %02i %02i 0x%08x 0x%08x\n", i, j, + dcplb_table[i][0], dcplb_table[i][1]); + *I0++ = dcplb_table[i][0]; + *I1++ = dcplb_table[i][1]; + j++; + } else { + debug("skip %02i %02i 0x%08x 0x%08x\n", i, j, + dcplb_table[i][0], dcplb_table[i][1]); + } + } + + for (i = 0; i < page_descriptor_table_size; i++) { + if (!(CPLB_LOCK & dcplb_table[i][1])) { + debug("adding %02i %02i 0x%08x 0x%08x\n", i, j, + dcplb_table[i][0], dcplb_table[i][1]); + *I0++ = dcplb_table[i][0]; + *I1++ = dcplb_table[i][1]; + j++; + if (j == 16) { + break; + } + } + } + + /* Fill the rest with invalid entry */ + if (j <= 15) { + for (; j < 16; j++) { + debug("filling %i with 0", j); + *I1++ = 0x0; + } + } + + cli(); + temp = *(unsigned int *)DMEM_CONTROL; + sync(); + asm(" .align 8; "); + *(unsigned int *)DMEM_CONTROL = + ACACHE_BCACHE | ENDCPLB | PORT_PREF0 | temp; + sync(); + sti(); +} + +void dcache_disable(void) +{ + unsigned int *I0, *I1; + int i; + + cli(); + sync(); + asm(" .align 8; "); + *(unsigned int *)DMEM_CONTROL &= + ~(ACACHE_BCACHE | ENDCPLB | PORT_PREF0); + sync(); + sti(); + + /* after disable dcache, + * clear it so we don't confuse the next application + */ + I0 = (unsigned int *)DCPLB_ADDR0; + I1 = (unsigned int *)DCPLB_DATA0; + + for (i = 0; i < 16; i++) { + *I0++ = 0x0; + *I1++ = 0x0; + } +} + +int dcache_status(void) +{ + unsigned int value; + value = *(unsigned int *)DMEM_CONTROL; + + if (value & (ENDCPLB)) + return CACHE_ON; + else + return CACHE_OFF; +} |