Re: [U-Boot] [PATCH v2 1/4] ARM: at91: clock: add UTMI PLL enable/disable function

[Heiko Schocher]

Hello Wenyou,

Am 09.12.2015 um 08:57 schrieb Wenyou Yang:

To avoid the duplicated code, add the UTMI PLL handle functions,
and add PMC_USB init function too.

Signed-off-by: Wenyou Yang <wenyou.y...@atmel.com>
---

Changes in v2: None

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

Tested on the smartweb board, see log:
http://xeidos.ddns.net/buildbot/builders/smartweb_dfu/builds/29/steps/shell/logs/tbotlog

Tested-by: Heiko Schocher <h...@denx.de>

bye,
Heiko

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__ */

--
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