[U-Boot] [PATCH v2 1/3] ARM: at91: clock: add PLLB enable/disable functions

Wenyou Yang
2016-01-27T02:04:12Z

To avoid the duplicated code, add the PLLB handle functions.

Signed-off-by: Wenyou Yang <wenyou.yang@atmel.com>
Reviewed-by: Andreas Bie?mann <andreas.devel@googlemail.com>
---

Changes in v2: None

arch/arm/mach-at91/arm926ejs/clock.c | 38 +++++++++++++++++++++++++++++++++
arch/arm/mach-at91/include/mach/clk.h | 2 ++
2 files changed, 40 insertions(+)

diff --git a/arch/arm/mach-at91/arm926ejs/clock.c b/arch/arm/mach-at91/arm926ejs/clock.c
index c8b5e10..c8d24ae 100644
--- a/arch/arm/mach-at91/arm926ejs/clock.c
+++ b/arch/arm/mach-at91/arm926ejs/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)
@@ -242,3 +244,39 @@ void at91_mck_init(u32 mckr)
while (!(readl(&pmc->sr) & AT91_PMC_MCKRDY))
;
}
+
+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;
+}
diff --git a/arch/arm/mach-at91/include/mach/clk.h b/arch/arm/mach-at91/include/mach/clk.h
index b2604ef..64dec52 100644
--- a/arch/arm/mach-at91/include/mach/clk.h
+++ b/arch/arm/mach-at91/include/mach/clk.h
@@ -133,5 +133,7 @@ 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);
+int at91_pllb_clk_enable(u32 pllbr);
+int at91_pllb_clk_disable(void);

#endif /* __ASM_ARM_ARCH_CLK_H__ */
--
1.7.9.5