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x86: Make cpu init functions weak

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This commit is contained in:
Graeme Russ 2011-02-12 15:11:35 +11:00
parent 4e33467d44
commit 0ea76e92e9
4 changed files with 17 additions and 32 deletions
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14
arch/i386/cpu/cpu.c
View file

@ -87,7 +87,7 @@ static void reload_gdt(void)
}
int cpu_init_f(void)
int x86_cpu_init_f(void)
{
const u32 em_rst = ~X86_CR0_EM;
const u32 mp_ne_set = X86_CR0_MP | X86_CR0_NE;
@ -102,15 +102,25 @@ int cpu_init_f(void)
return 0;
}
int cpu_init_f(void) __attribute__((weak, alias("x86_cpu_init_f")));
int cpu_init_r(void)
int x86_cpu_init_r(void)
{
const u32 nw_cd_rst = ~(X86_CR0_NW | X86_CR0_CD);
/* turn on the cache and disable write through */
asm("movl %%cr0, %%eax\n"
"andl %0, %%eax\n"
"movl %%eax, %%cr0\n"
"wbinvd\n" : : "i" (nw_cd_rst) : "eax");
reload_gdt();
/* Initialize core interrupt and exception functionality of CPU */
cpu_init_interrupts ();
return 0;
}
int cpu_init_r(void) __attribute__((weak, alias("x86_cpu_init_r")));
int do_reset(cmd_tbl_t *cmdtp, int flag, int argc, char * const argv[])
{

11
arch/i386/cpu/sc520/sc520.c
View file

@ -1,6 +1,6 @@
/*
* (C) Copyright 2002
* Daniel Engström, Omicron Ceti AB <daniel@omicron.se>.
* Daniel Engstr<EFBFBD>m, Omicron Ceti AB <daniel@omicron.se>.
*
* See file CREDITS for list of people who contributed to this
* project.
@ -40,10 +40,8 @@ DECLARE_GLOBAL_DATA_PTR;
volatile sc520_mmcr_t *sc520_mmcr = (sc520_mmcr_t *)0xfffef000;
void init_sc520(void)
int cpu_init_f(void)
{
const u32 nw_cd_rst = ~(X86_CR0_NW | X86_CR0_CD);
/*
* Set the UARTxCTL register at it's slower,
* baud clock giving us a 1.8432 MHz reference
@ -85,10 +83,7 @@ void init_sc520(void)
/* turn on the SDRAM write buffer */
writeb(0x11, &sc520_mmcr->dbctl);
/* turn on the cache and disable write through */
asm("movl %%cr0, %%eax\n"
"andl %0, %%eax\n"
"movl %%eax, %%cr0\n" : : "i" (nw_cd_rst) : "eax");
return x86_cpu_init_f();
}
unsigned long init_sc520_dram(void)

2
arch/i386/include/asm/u-boot-i386.h
View file

@ -25,7 +25,9 @@
#define _U_BOOT_I386_H_ 1
/* cpu/.../cpu.c */
int x86_cpu_init_r(void);
int cpu_init_r(void);
int x86_cpu_init_f(void);
int cpu_init_f(void);
/* cpu/.../timer.c */

22
board/eNET/eNET.c
View file

@ -48,33 +48,11 @@ unsigned long monitor_flash_len = CONFIG_SYS_MONITOR_LEN;
static void enet_timer_isr(void);
static void enet_toggle_run_led(void);
void init_sc520_enet (void)
{
/* Set CPU Speed to 100MHz */
writeb(0x01, &sc520_mmcr->cpuctl);
/* wait at least one millisecond */
asm("movl $0x2000,%%ecx\n"
"0: pushl %%ecx\n"
"popl %%ecx\n"
"loop 0b\n": : : "ecx");
/* turn on the SDRAM write buffer */
writeb(0x11, &sc520_mmcr->dbctl);
/* turn on the cache and disable write through */
asm("movl %%cr0, %%eax\n"
"andl $0x9fffffff, %%eax\n"
"movl %%eax, %%cr0\n" : : : "eax");
}
/*
* Miscellaneous platform dependent initializations
*/
int board_early_init_f(void)
{
init_sc520_enet();
writeb(0x01, &sc520_mmcr->gpcsrt); /* GP Chip Select Recovery Time */
writeb(0x07, &sc520_mmcr->gpcspw); /* GP Chip Select Pulse Width */
writeb(0x00, &sc520_mmcr->gpcsoff); /* GP Chip Select Offset */