[PATCH] ARM: EXYNOS: Add exynos3250 suspend-to-ram support

[Chanwoo Choi]

Dear Kukjin,

Could you please review this patch-set?

I tested this patch-set on Exynos3250-baesd Rinato board.

Best Regards,
Chanwoo Choi

On 12/24/2014 11:37 AM, Chanwoo Choi wrote:
> This patch adds the support for suspend-to-ram feature of Exynos3250 SoC.
> Exynos3250 don't contain the L2 cache.
> 
> The measured power-consumption in suspend state:
> - before entering suspend : 31mA
> - in suspend state : 16mA
> 
> Cc: Kukjin Kim <kgene.kim at samsung.com>
> Signed-off-by: Chanwoo Choi <cw00.choi at samsung.com>
> Acked-by: Kyungmin Park <kyungmin.park at samsung.com>
> ---
> This patch is based on v3.19-rc1 and is tested on Exynos3250-based Rinato board.
> 
>  arch/arm/mach-exynos/regs-pmu.h |  3 ++
>  arch/arm/mach-exynos/suspend.c  | 77 +++++++++++++++++++++++++++++++++++++++++
>  2 files changed, 80 insertions(+)
> 
> diff --git a/arch/arm/mach-exynos/regs-pmu.h b/arch/arm/mach-exynos/regs-pmu.h
> index b5f4406..eb461e1 100644
> --- a/arch/arm/mach-exynos/regs-pmu.h
> +++ b/arch/arm/mach-exynos/regs-pmu.h
> @@ -160,12 +160,14 @@
>  #define EXYNOS5_L2RSTDISABLE_VALUE		BIT(3)
>  
>  #define S5P_PAD_RET_MAUDIO_OPTION		0x3028
> +#define S5P_PAD_RET_MMC2_OPTION			0x30c8
>  #define S5P_PAD_RET_GPIO_OPTION			0x3108
>  #define S5P_PAD_RET_UART_OPTION			0x3128
>  #define S5P_PAD_RET_MMCA_OPTION			0x3148
>  #define S5P_PAD_RET_MMCB_OPTION			0x3168
>  #define S5P_PAD_RET_EBIA_OPTION			0x3188
>  #define S5P_PAD_RET_EBIB_OPTION			0x31A8
> +#define S5P_PAD_RET_SPI_OPTION			0x31c8
>  
>  #define S5P_PS_HOLD_CONTROL			0x330C
>  #define S5P_PS_HOLD_EN				(1 << 31)
> @@ -326,6 +328,7 @@
>  			(EXYNOS3_ARM_CORE0_OPTION + ((_nr) * 0x80))
>  
>  #define EXYNOS3_ARM_COMMON_OPTION			0x2408
> +#define EXYNOS3_ARM_L2_OPTION				0x2608
>  #define EXYNOS3_TOP_PWR_OPTION				0x2C48
>  #define EXYNOS3_CORE_TOP_PWR_OPTION			0x2CA8
>  #define EXYNOS3_XUSBXTI_DURATION			0x341C
> diff --git a/arch/arm/mach-exynos/suspend.c b/arch/arm/mach-exynos/suspend.c
> index f8e7dcd..d6feef3 100644
> --- a/arch/arm/mach-exynos/suspend.c
> +++ b/arch/arm/mach-exynos/suspend.c
> @@ -91,6 +91,12 @@ static unsigned int exynos_pmu_spare3;
>  
>  static u32 exynos_irqwake_intmask = 0xffffffff;
>  
> +static const struct exynos_wkup_irq exynos3250_wkup_irq[] = {
> +	{ 73, BIT(1) }, /* RTC alarm */
> +	{ 74, BIT(2) }, /* RTC tick */
> +	{ /* sentinel */ },
> +};
> +
>  static const struct exynos_wkup_irq exynos4_wkup_irq[] = {
>  	{ 76, BIT(1) }, /* RTC alarm */
>  	{ 77, BIT(2) }, /* RTC tick */
> @@ -114,6 +120,19 @@ unsigned int exynos_release_ret_regs[] = {
>  	REG_TABLE_END,
>  };
>  
> +unsigned int exynos3250_release_ret_regs[] = {
> +	S5P_PAD_RET_MAUDIO_OPTION,
> +	S5P_PAD_RET_GPIO_OPTION,
> +	S5P_PAD_RET_UART_OPTION,
> +	S5P_PAD_RET_MMCA_OPTION,
> +	S5P_PAD_RET_MMCB_OPTION,
> +	S5P_PAD_RET_EBIA_OPTION,
> +	S5P_PAD_RET_EBIB_OPTION,
> +	S5P_PAD_RET_MMC2_OPTION,
> +	S5P_PAD_RET_SPI_OPTION,
> +	REG_TABLE_END,
> +};
> +
>  unsigned int exynos5420_release_ret_regs[] = {
>  	EXYNOS_PAD_RET_DRAM_OPTION,
>  	EXYNOS_PAD_RET_MAUDIO_OPTION,
> @@ -173,6 +192,12 @@ static int exynos_cpu_suspend(unsigned long arg)
>  	return exynos_cpu_do_idle();
>  }
>  
> +static int exynos3250_cpu_suspend(unsigned long arg)
> +{
> +	flush_cache_all();
> +	return exynos_cpu_do_idle();
> +}
> +
>  static int exynos5420_cpu_suspend(unsigned long arg)
>  {
>  	/* MCPM works with HW CPU identifiers */
> @@ -230,6 +255,23 @@ static void exynos_pm_prepare(void)
>  	pmu_raw_writel(virt_to_phys(exynos_cpu_resume), S5P_INFORM0);
>  }
>  
> +static void exynos3250_pm_prepare(void)
> +{
> +	unsigned int tmp;
> +
> +	/* Set wake-up mask registers */
> +	exynos_pm_set_wakeup_mask();
> +
> +	tmp = pmu_raw_readl(EXYNOS3_ARM_L2_OPTION);
> +	tmp &= ~EXYNOS5_OPTION_USE_RETENTION;
> +	pmu_raw_writel(tmp, EXYNOS3_ARM_L2_OPTION);
> +
> +	exynos_pm_enter_sleep_mode();
> +
> +	/* ensure at least INFORM0 has the resume address */
> +	pmu_raw_writel(virt_to_phys(exynos_cpu_resume), S5P_INFORM0);
> +}
> +
>  static void exynos5420_pm_prepare(void)
>  {
>  	unsigned int tmp;
> @@ -344,6 +386,28 @@ early_wakeup:
>  	pmu_raw_writel(0x0, S5P_INFORM1);
>  }
>  
> +static void exynos3250_pm_resume(void)
> +{
> +	u32 cpuid = read_cpuid_part();
> +
> +	if (exynos_pm_central_resume())
> +		goto early_wakeup;
> +
> +	/* For release retention */
> +	exynos_pm_release_retention();
> +
> +	pmu_raw_writel(S5P_USE_STANDBY_WFI_ALL, S5P_CENTRAL_SEQ_OPTION);
> +
> +	if (call_firmware_op(resume) == -ENOSYS
> +	    && cpuid == ARM_CPU_PART_CORTEX_A9)
> +		exynos_cpu_restore_register();
> +
> +early_wakeup:
> +
> +	/* Clear SLEEP mode set in INFORM1 */
> +	pmu_raw_writel(0x0, S5P_INFORM1);
> +}
> +
>  static void exynos5420_prepare_pm_resume(void)
>  {
>  	if (IS_ENABLED(CONFIG_EXYNOS5420_MCPM))
> @@ -483,6 +547,16 @@ static const struct platform_suspend_ops exynos_suspend_ops = {
>  	.valid		= suspend_valid_only_mem,
>  };
>  
> +static const struct exynos_pm_data exynos3250_pm_data = {
> +	.wkup_irq	= exynos3250_wkup_irq,
> +	.wake_disable_mask = ((0xFF << 8) | (0x1F << 1)),
> +	.release_ret_regs = exynos3250_release_ret_regs,
> +	.pm_suspend	= exynos_pm_suspend,
> +	.pm_resume	= exynos3250_pm_resume,
> +	.pm_prepare	= exynos3250_pm_prepare,
> +	.cpu_suspend	= exynos3250_cpu_suspend,
> +};
> +
>  static const struct exynos_pm_data exynos4_pm_data = {
>  	.wkup_irq	= exynos4_wkup_irq,
>  	.wake_disable_mask = ((0xFF << 8) | (0x1F << 1)),
> @@ -518,6 +592,9 @@ static struct exynos_pm_data exynos5420_pm_data = {
>  
>  static struct of_device_id exynos_pmu_of_device_ids[] = {
>  	{
> +		.compatible = "samsung,exynos3250-pmu",
> +		.data = &exynos3250_pm_data,
> +	}, {
>  		.compatible = "samsung,exynos4210-pmu",
>  		.data = &exynos4_pm_data,
>  	}, {
>