ARM: at91: clock: add UTMI PLL enable/disable function
To avoid the duplicated code, add the UTMI PLL handle functions,
and add PMC_USB init function too.
Signed-off-by: Wenyou Yang <wenyou.yang@atmel.com>
Tested-by: Heiko Schocher <hs@denx.de>
Reviewed-by: Andreas Bießmann <andreas.devel@googlemail.com>
diff --git a/arch/arm/mach-at91/clock.c b/arch/arm/mach-at91/clock.c
index 2a0308f..5300d68 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 @@
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 bef4e1c..b2604ef 100644
--- a/arch/arm/mach-at91/include/mach/clk.h
+++ b/arch/arm/mach-at91/include/mach/clk.h
@@ -130,5 +130,8 @@
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__ */