Re: [PATCH v6 6/8] ARM: rockchip: add support smp for rk3036

[Rob Herring <robh@kernel.org>]

On Wed, Nov 04, 2015 at 08:25:16PM +0800, Xing Zheng wrote:
> From: Heiko Stuebner <heiko@sntech.de>
> 
> The dual-core Cortex A7 rk3036 is a bit special in that it does not allow
> to control the actual powerdomain of the cpu cores, while the rest of the
> smp-bringup like reset control and entry address handling stays the same.
> Its bigger sibling, the quad-core rk3128 again allows powerdomain control.
> 
> So allow that case by introducing a separate smp-enable-method, that simply
> disables powerdomain handling in the common code.
> 
> Signed-off-by: Heiko Stuebner <heiko@sntech.de>
> Tested-by: Xing Zheng <zhengxing@rock-chips.com>
> Signed-off-by: Xing Zheng <zhengxing@rock-chips.com>
> ---
> 
> Changes in v6: None
> 
>  Documentation/devicetree/bindings/arm/cpus.txt |    1 +

Acked-by: Rob Herring <robh@kernel.org>

>  arch/arm/mach-rockchip/platsmp.c               |   45 +++++++++++++++++-------
>  2 files changed, 34 insertions(+), 12 deletions(-)
> 
> diff --git a/Documentation/devicetree/bindings/arm/cpus.txt b/Documentation/devicetree/bindings/arm/cpus.txt
> index 3a07a87..8fb0749 100644
> --- a/Documentation/devicetree/bindings/arm/cpus.txt
> +++ b/Documentation/devicetree/bindings/arm/cpus.txt
> @@ -200,6 +200,7 @@ nodes to be present and contain the properties described below.
>  			    "qcom,gcc-msm8660"
>  			    "qcom,kpss-acc-v1"
>  			    "qcom,kpss-acc-v2"
> +			    "rockchip,rk3036-smp"
>  			    "rockchip,rk3066-smp"
>  			    "ste,dbx500-smp"
>  
> diff --git a/arch/arm/mach-rockchip/platsmp.c b/arch/arm/mach-rockchip/platsmp.c
> index 3e7a4b7..5c138f9 100644
> --- a/arch/arm/mach-rockchip/platsmp.c
> +++ b/arch/arm/mach-rockchip/platsmp.c
> @@ -42,6 +42,7 @@ static int ncores;
>  #define PMU_PWRDN_SCU		4
>  
>  static struct regmap *pmu;
> +static int has_pmu = true;
>  
>  static int pmu_power_domain_is_on(int pd)
>  {
> @@ -89,20 +90,23 @@ static int pmu_set_power_domain(int pd, bool on)
>  	if (!IS_ERR(rstc) && !on)
>  		reset_control_assert(rstc);
>  
> -	ret = regmap_update_bits(pmu, PMU_PWRDN_CON, BIT(pd), val);
> -	if (ret < 0) {
> -		pr_err("%s: could not update power domain\n", __func__);
> -		return ret;
> -	}
> -
> -	ret = -1;
> -	while (ret != on) {
> -		ret = pmu_power_domain_is_on(pd);
> +	if (has_pmu) {
> +		ret = regmap_update_bits(pmu, PMU_PWRDN_CON, BIT(pd), val);
>  		if (ret < 0) {
> -			pr_err("%s: could not read power domain state\n",
> +			pr_err("%s: could not update power domain\n",
>  			       __func__);
>  			return ret;
>  		}
> +
> +		ret = -1;
> +		while (ret != on) {
> +			ret = pmu_power_domain_is_on(pd);
> +			if (ret < 0) {
> +				pr_err("%s: could not read power domain state\n",
> +				       __func__);
> +				return ret;
> +			}
> +		}
>  	}
>  
>  	if (!IS_ERR(rstc)) {
> @@ -122,7 +126,7 @@ static int rockchip_boot_secondary(unsigned int cpu, struct task_struct *idle)
>  {
>  	int ret;
>  
> -	if (!sram_base_addr || !pmu) {
> +	if (!sram_base_addr || (has_pmu && !pmu)) {
>  		pr_err("%s: sram or pmu missing for cpu boot\n", __func__);
>  		return -ENXIO;
>  	}
> @@ -275,7 +279,7 @@ static void __init rockchip_smp_prepare_cpus(unsigned int max_cpus)
>  		return;
>  	}
>  
> -	if (rockchip_smp_prepare_pmu())
> +	if (has_pmu && rockchip_smp_prepare_pmu())
>  		return;
>  
>  	if (read_cpuid_part() == ARM_CPU_PART_CORTEX_A9) {
> @@ -318,6 +322,13 @@ static void __init rockchip_smp_prepare_cpus(unsigned int max_cpus)
>  		pmu_set_power_domain(0 + i, false);
>  }
>  
> +static void __init rk3036_smp_prepare_cpus(unsigned int max_cpus)
> +{
> +	has_pmu = false;
> +
> +	rockchip_smp_prepare_cpus(max_cpus);
> +}
> +
>  #ifdef CONFIG_HOTPLUG_CPU
>  static int rockchip_cpu_kill(unsigned int cpu)
>  {
> @@ -340,6 +351,15 @@ static void rockchip_cpu_die(unsigned int cpu)
>  }
>  #endif
>  
> +static struct smp_operations rk3036_smp_ops __initdata = {
> +	.smp_prepare_cpus	= rk3036_smp_prepare_cpus,
> +	.smp_boot_secondary	= rockchip_boot_secondary,
> +#ifdef CONFIG_HOTPLUG_CPU
> +	.cpu_kill		= rockchip_cpu_kill,
> +	.cpu_die		= rockchip_cpu_die,
> +#endif
> +};
> +
>  static struct smp_operations rockchip_smp_ops __initdata = {
>  	.smp_prepare_cpus	= rockchip_smp_prepare_cpus,
>  	.smp_boot_secondary	= rockchip_boot_secondary,
> @@ -349,4 +369,5 @@ static struct smp_operations rockchip_smp_ops __initdata = {
>  #endif
>  };
>  
> +CPU_METHOD_OF_DECLARE(rk3036_smp, "rockchip,rk3036-smp", &rk3036_smp_ops);
>  CPU_METHOD_OF_DECLARE(rk3066_smp, "rockchip,rk3066-smp", &rockchip_smp_ops);
> -- 
> 1.7.9.5
> 
>