diff options
Diffstat (limited to 'arch/arm/mach-at91/arm920t/clock.c')
| -rw-r--r-- | arch/arm/mach-at91/arm920t/clock.c | 38 |
1 files changed, 38 insertions, 0 deletions
diff --git a/arch/arm/mach-at91/arm920t/clock.c b/arch/arm/mach-at91/arm920t/clock.c index 2813bf7..8aa2100 100644 --- a/arch/arm/mach-at91/arm920t/clock.c +++ b/arch/arm/mach-at91/arm920t/clock.c @@ -18,6 +18,8 @@ # error You need to define CONFIG_AT91FAMILY in your board config! #endif +#define EN_PLLB_TIMEOUT 500 + DECLARE_GLOBAL_DATA_PTR; static unsigned long at91_css_to_rate(unsigned long css) @@ -155,3 +157,39 @@ int at91_clock_init(unsigned long main_clock) return 0; } + +int at91_pllb_clk_enable(u32 pllbr) +{ + struct at91_pmc *pmc = (at91_pmc_t *)ATMEL_BASE_PMC; + ulong start_time, tmp_time; + + start_time = get_timer(0); + writel(pllbr, &pmc->pllbr); + while ((readl(&pmc->sr) & AT91_PMC_LOCKB) != AT91_PMC_LOCKB) { + tmp_time = get_timer(0); + if ((tmp_time - start_time) > EN_PLLB_TIMEOUT) { + printf("ERROR: failed to enable PLLB\n"); + return -1; + } + } + + return 0; +} + +int at91_pllb_clk_disable(void) +{ + struct at91_pmc *pmc = (at91_pmc_t *)ATMEL_BASE_PMC; + ulong start_time, tmp_time; + + start_time = get_timer(0); + writel(0, &pmc->pllbr); + while ((readl(&pmc->sr) & AT91_PMC_LOCKB) != 0) { + tmp_time = get_timer(0); + if ((tmp_time - start_time) > EN_PLLB_TIMEOUT) { + printf("ERROR: failed to disable PLLB\n"); + return -1; + } + } + + return 0; +} |