diff options
| author | Wenyou Yang <wenyou.yang@atmel.com> | 2016-02-03 10:20:43 +0800 |
|---|---|---|
| committer | Andreas Bießmann <andreas.devel@googlemail.com> | 2016-02-18 21:34:41 +0100 |
| commit | be5e485cf995d916ec2e0d2381879ae205354e5c (patch) | |
| tree | b566dfb276fe4ec812ee357234290218622292f7 /arch/arm/mach-at91/arm920t/clock.c | |
| parent | 8d233521cd5f26f093e2bf835118149fea4111c3 (diff) | |
ARM: at91: clock: add PLLB enable/disable functions
To avoid the duplicated code, add the PLLB handle functions.
Signed-off-by: Wenyou Yang <wenyou.yang@atmel.com>
Reviewed-by: Andreas Bießmann <andreas.devel@googlemail.com>
Tested-by: Heiko Schocher <hs@denx.de>
[add enable/disable functions to arm920t]
Signed-off-by: Andreas Bießmann <andreas.devel@googlemail.com>
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 2813bf7821..8aa21005d0 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; +} |