diff options
Diffstat (limited to 'arch/arm/cpu/at91-common')
| -rw-r--r-- | arch/arm/cpu/at91-common/spl.c | 39 |
1 files changed, 39 insertions, 0 deletions
diff --git a/arch/arm/cpu/at91-common/spl.c b/arch/arm/cpu/at91-common/spl.c index 7f4debb..cbb5a52 100644 --- a/arch/arm/cpu/at91-common/spl.c +++ b/arch/arm/cpu/at91-common/spl.c @@ -20,6 +20,43 @@ static void at91_disable_wdt(void) writel(AT91_WDT_MR_WDDIS, &wdt->mr); } +static void switch_to_main_crystal_osc(void) +{ + struct at91_pmc *pmc = (struct at91_pmc *)ATMEL_BASE_PMC; + u32 tmp; + + tmp = readl(&pmc->mor); + tmp &= ~AT91_PMC_MOR_OSCOUNT(0xff); + tmp &= ~AT91_PMC_MOR_KEY(0xff); + tmp |= AT91_PMC_MOR_MOSCEN; + tmp |= AT91_PMC_MOR_OSCOUNT(8); + tmp |= AT91_PMC_MOR_KEY(0x37); + writel(tmp, &pmc->mor); + while (!(readl(&pmc->sr) & AT91_PMC_IXR_MOSCS)) + ; + + tmp = readl(&pmc->mor); + tmp &= ~AT91_PMC_MOR_OSCBYPASS; + tmp &= ~AT91_PMC_MOR_KEY(0xff); + tmp |= AT91_PMC_MOR_KEY(0x37); + writel(tmp, &pmc->mor); + + tmp = readl(&pmc->mor); + tmp |= AT91_PMC_MOR_MOSCSEL; + tmp &= ~AT91_PMC_MOR_KEY(0xff); + tmp |= AT91_PMC_MOR_KEY(0x37); + writel(tmp, &pmc->mor); + + while (!(readl(&pmc->sr) & AT91_PMC_IXR_MOSCSELS)) + ; + + tmp = readl(&pmc->mor); + tmp &= ~AT91_PMC_MOR_MOSCRCEN; + tmp &= ~AT91_PMC_MOR_KEY(0xff); + tmp |= AT91_PMC_MOR_KEY(0x37); + writel(tmp, &pmc->mor); +} + void at91_plla_init(u32 pllar) { struct at91_pmc *pmc = (struct at91_pmc *)ATMEL_BASE_PMC; @@ -76,6 +113,8 @@ u32 spl_boot_mode(void) void s_init(void) { + switch_to_main_crystal_osc(); + /* disable watchdog */ at91_disable_wdt(); |