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Diffstat (limited to 'arch/arm/mach-at91/arm920t/clock.c')
-rw-r--r--arch/arm/mach-at91/arm920t/clock.c38
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;
+}