diff options
Diffstat (limited to 'arch/arm/mach-at91')
| -rw-r--r-- | arch/arm/mach-at91/clock.c | 48 | ||||
| -rw-r--r-- | arch/arm/mach-at91/include/mach/clk.h | 3 |
2 files changed, 51 insertions, 0 deletions
diff --git a/arch/arm/mach-at91/clock.c b/arch/arm/mach-at91/clock.c index 2a0308fa64..5300d683d2 100644 --- a/arch/arm/mach-at91/clock.c +++ b/arch/arm/mach-at91/clock.c @@ -10,6 +10,8 @@ #include <asm/arch/hardware.h> #include <asm/arch/at91_pmc.h> +#define EN_UPLL_TIMEOUT 500 + void at91_periph_clk_enable(int id) { struct at91_pmc *pmc = (struct at91_pmc *)ATMEL_BASE_PMC; @@ -64,3 +66,49 @@ void at91_system_clk_disable(int sys_clk) writel(sys_clk, &pmc->scdr); } + +int at91_upll_clk_enable(void) +{ + struct at91_pmc *pmc = (at91_pmc_t *)ATMEL_BASE_PMC; + ulong start_time, tmp_time; + + if ((readl(&pmc->uckr) & AT91_PMC_UPLLEN) == AT91_PMC_UPLLEN) + return 0; + + start_time = get_timer(0); + writel(AT91_PMC_UPLLEN | AT91_PMC_BIASEN, &pmc->uckr); + while ((readl(&pmc->sr) & AT91_PMC_LOCKU) != AT91_PMC_LOCKU) { + tmp_time = get_timer(0); + if ((tmp_time - start_time) > EN_UPLL_TIMEOUT) { + printf("ERROR: failed to enable UPLL\n"); + return -1; + } + } + + return 0; +} + +int at91_upll_clk_disable(void) +{ + struct at91_pmc *pmc = (at91_pmc_t *)ATMEL_BASE_PMC; + ulong start_time, tmp_time; + + start_time = get_timer(0); + writel(readl(&pmc->uckr) & ~AT91_PMC_UPLLEN, &pmc->uckr); + while ((readl(&pmc->sr) & AT91_PMC_LOCKU) == AT91_PMC_LOCKU) { + tmp_time = get_timer(0); + if ((tmp_time - start_time) > EN_UPLL_TIMEOUT) { + printf("ERROR: failed to stop UPLL\n"); + return -1; + } + } + + return 0; +} + +void at91_usb_clk_init(u32 value) +{ + struct at91_pmc *pmc = (struct at91_pmc *)ATMEL_BASE_PMC; + + writel(value, &pmc->usb); +} diff --git a/arch/arm/mach-at91/include/mach/clk.h b/arch/arm/mach-at91/include/mach/clk.h index bef4e1c101..b2604ef5b0 100644 --- a/arch/arm/mach-at91/include/mach/clk.h +++ b/arch/arm/mach-at91/include/mach/clk.h @@ -130,5 +130,8 @@ int at91_enable_periph_generated_clk(u32 id, u32 clk_source, u32 div); u32 at91_get_periph_generated_clk(u32 id); void at91_system_clk_enable(int sys_clk); void at91_system_clk_disable(int sys_clk); +int at91_upll_clk_enable(void); +int at91_upll_clk_disable(void); +void at91_usb_clk_init(u32 value); #endif /* __ASM_ARM_ARCH_CLK_H__ */ |
