diff mbox

[U-Boot,1/4] ARM: at91: clock: add UTMI PLL enable/disable function

Message ID 1449635102-7908-2-git-send-email-wenyou.yang@atmel.com
State Accepted
Commit 1e70b373466974a7b75e39ddfa944aec7d1cccef
Headers show

Commit Message

Wenyou Yang Dec. 9, 2015, 4:24 a.m. UTC 
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>
---

 arch/arm/mach-at91/clock.c            |   48 +++++++++++++++++++++++++++++++++
 arch/arm/mach-at91/include/mach/clk.h |    3 +++
 2 files changed, 51 insertions(+)
diff mbox

Patch

diff --git a/arch/arm/mach-at91/clock.c b/arch/arm/mach-at91/clock.c
index 823d218..b8f8d48 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;
@@ -70,3 +72,49 @@  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 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 @@  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__ */