On Tue, Jan 9, 2018 at 8:59 AM, Chanwoo Choi <cw00.choi@xxxxxxxxxxx> wrote:
> This patch adds the specific exynos_pm_data instance for Exynos5433
> in order to support the suspend-to-ram. Exynos5433 SoC need to write
> the 'cpu_resume' poiter address and the specific magic number
> for suspend mode.
>
> Signed-off-by: Jonghwa Lee <jonghwa3.lee@xxxxxxxxxxx>
> Signed-off-by: Chanwoo Choi <cw00.choi@xxxxxxxxxxx>
> ---
> drivers/soc/samsung/exynos-pm.c | 38 ++++++++++++++++++++++++++++++++++++++
> 1 file changed, 38 insertions(+)
>
> diff --git a/drivers/soc/samsung/exynos-pm.c b/drivers/soc/samsung/exynos-pm.c
> index 45d84bbe5e61..70d949ba5cab 100644
> --- a/drivers/soc/samsung/exynos-pm.c
> +++ b/drivers/soc/samsung/exynos-pm.c
> @@ -12,6 +12,7 @@
> #include <linux/regulator/machine.h>
> #include <linux/syscore_ops.h>
> #include <linux/suspend.h>
> +#include <linux/psci.h>
>
> #include <asm/cpuidle.h>
> #include <asm/io.h>
> @@ -123,7 +124,44 @@ static void exynos_pm_finish(void)
> #define exynos_pm_data_arm_ptr(data) NULL
> #endif
>
> +static int exynos5433_pm_suspend(unsigned long unused)
> +{
> + /*
> + * Exynos5433 uses PSCI v0.1 which provides the only one
> + * entry point (psci_ops.cpu_suspend) for both cpuidle and
> + * suspend-to-RAM. Also, PSCI v0.1 needs the specific 'power_state'
> + * parameter for the suspend mode. In order to enter suspend mode,
> + * Exynos5433 calls the 'psci_ops.cpu_suspend' with '0x3010000'
> + * power_state parameter.
> + *
> + * '0x3010000' means that both cluster and system are going to enter
> + * the power-down state as following:
> + * - [25:24] 0x3 : Indicate the cluster and system.
> + * - [16] 0x1 : Indicate power-down state.
Define them, it will be more readable (name of define given just as an example):
EXYNOS5433_PCSI_SUSPEND_SYSTEM (0x3 << 24)
(or even split per system and cluser and use BIT() if this is real meaning)
and probably reuse existing S5P_CENTRAL_LOWPWR_CFG
> + */
> + return psci_ops.cpu_suspend(0x3010000, __pa_symbol(cpu_resume));
> +}
> +
> +static int exynos5433_pm_suspend_enter(suspend_state_t state)
> +{
> + if (!sysram_ns_base_addr)
> + return -EINVAL;
> +
> + __raw_writel(virt_to_phys(cpu_resume), sysram_ns_base_addr + 0x8);
> + __raw_writel(EXYNOS_SLEEP_MAGIC, sysram_ns_base_addr + 0xc);
Document them in Documentation/arm/Samsung/Bootloader-interface.txt.
Best regards,
Krzysztof
> +
> + return cpu_suspend(0, exynos5433_pm_suspend);
> +}
> +
> +const struct exynos_pm_data exynos5433_pm_data = {
> + .enter = exynos5433_pm_suspend_enter,
> +};
> +
> static const struct of_device_id exynos_pm_of_device_ids[] = {
> + {
> + .compatible = "samsung,exynos5433-pmu",
> + .data = exynos_pm_data_arm_ptr(exynos5433_pm_data),
> + },
> { /*sentinel*/ },
> };
>
> --
> 1.9.1
>
--
To unsubscribe from this list: send the line "unsubscribe devicetree" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at http://vger.kernel.org/majordomo-info.html
