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

[Andreas Bießmann]

On 09.12.2015 05:29, Wenyou Yang wrote:
> To avoid the duplicated code, add the PLLB handle functions.
> 
> Signed-off-by: Wenyou Yang <wenyou.yang at atmel.com>

Reviewed-by: Andreas Bießmann <andreas.devel at googlemail.com>

> ---
> 
>  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__ */
>