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at91sam926x: lowlevel add external boot support 

Signed-off-by: Jean-Christophe PLAGNIOL-VILLARD <plagnioj@jcrosoft.com>
Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>
This commit is contained in:
Jean-Christophe PLAGNIOL-VILLARD 2013-01-22 15:40:40 +01:00 committed by Sascha Hauer
parent faa6b0b603
commit f32a8cdd89
1 changed files with 18 additions and 2 deletions
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20
arch/arm/mach-at91/at91sam926x_lowlevel_init.c
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@ -36,10 +36,19 @@ static void inline pmc_check_mckrdy(void)
} while (!(r & AT91_PMC_MCKRDY));
}
static int inline running_in_sram(void)
{
u32 addr = get_pc();
addr >>= 28;
return addr == 0;
}
void __naked __bare_init reset(void)
{
u32 r;
int i;
int in_sram = running_in_sram();
common_reset();
@ -74,7 +83,7 @@ void __naked __bare_init reset(void)
* PMC Check if the PLL is already initialized
*/
r = at91_pmc_read(AT91_PMC_MCKR);
if (r & AT91_PMC_CSS)
if (r & AT91_PMC_CSS && !in_sram)
goto end;
/*
@ -117,7 +126,7 @@ void __naked __bare_init reset(void)
* SDRAMC Check if Refresh Timer Counter is already initialized
*/
r = at91_sys_read(AT91_SDRAMC_TR);
if (r)
if (r && !in_sram)
goto end;
/* SDRAMC_MR : Normal Mode */
@ -170,6 +179,13 @@ void __naked __bare_init reset(void)
/* MATRIX_MCFG - REMAP all masters */
at91_sys_write(AT91_MATRIX_MCFG0, 0x1FF);
#endif
/*
* When boot from external boot
* we need to enable mck and ohter clock
* so enable all of them
* We will shutdown what we don't need later
*/
at91_pmc_write(AT91_PMC_PCER, 0xffffffff);
end:
board_init_lowlevel_return();