Tero Kristo <tero.kristo@xxxxxxxxx> writes:
> From: Tero Kristo <tero.kristo@xxxxxxxxx>
>
> pwrdm_can_idle(pwrdm) will check if the specified powerdomain can enter
> idle. This is done by checking all clockdomains under the powerdomain
> if they can idle also.
>
> omap2_clkdm_can_idle(clkdm) will check if the specified clockdomain can
> enter idle. This checks the functional clocks and idle status bits of the
> domain according to following rules:
> 1) functional clock check
> * get FCLK register content
> * ignore all clocks defined in idle_def.fclk_ignore
> * if any active functional clocks remain, domain can't idle
> 2) idle status check
> * get IDLEST register content
> * inverse it (any non-idle blocks are now as 1)
> * mask against idle_def.idlest_mask
> * if any bits remain high, domain can't idle
>
> These calls can be used e.g. inside cpuidle to decide which power states
> core and mpu should enter during idle, as there are certain dependencies
> between wakeup capabilities and reset logic.
>
> Signed-off-by: Tero Kristo <tero.kristo@xxxxxxxxx>
I'm OK with this version.
Paul?
Kevin
> ---
> arch/arm/mach-omap2/clockdomain.c | 32 ++++++++
> arch/arm/mach-omap2/clockdomains.h | 106 +++++++++++++++++++++++++
> arch/arm/mach-omap2/powerdomain.c | 20 +++++
> arch/arm/plat-omap/include/plat/clockdomain.h | 17 ++++
> arch/arm/plat-omap/include/plat/powerdomain.h | 1 +
> 5 files changed, 176 insertions(+), 0 deletions(-)
>
> diff --git a/arch/arm/mach-omap2/clockdomain.c b/arch/arm/mach-omap2/clockdomain.c
> index a38a615..9ebff51 100644
> --- a/arch/arm/mach-omap2/clockdomain.c
> +++ b/arch/arm/mach-omap2/clockdomain.c
> @@ -867,6 +867,38 @@ int omap2_clkdm_wakeup(struct clockdomain *clkdm)
> return 0;
> }
>
> +
> +/**
> + * omap2_clkdm_can_idle - check if clockdomain has any active clocks or not
> + * @clkdm: struct clockdomain *
> + *
> + * Checks if the clockdomain has any active clock or not, i.e. whether it
> + * can enter idle. Returns -EINVAL if clkdm is NULL; 0 if unable to idle;
> + * 1 if can idle.
> + */
> +int omap2_clkdm_can_idle(struct clockdomain *clkdm)
> +{
> + int i;
> +
> + if (!clkdm)
> + return -EINVAL;
> +
> + for (i = 0; i < clkdm->clk_reg_num; i++) {
> + u32 idlest, fclk;
> +
> + fclk = cm_read_mod_reg(clkdm->pwrdm.ptr->prcm_offs,
> + CM_FCLKEN + 4 * i);
> + if (fclk & ~clkdm->idle_def[i].fclk_ignore)
> + return 0;
> +
> + idlest = cm_read_mod_reg(clkdm->pwrdm.ptr->prcm_offs,
> + CM_IDLEST + 4 * i);
> + if (~idlest & clkdm->idle_def[i].idlest_mask)
> + return 0;
> + }
> + return 1;
> +}
> +
> /**
> * omap2_clkdm_allow_idle - enable hwsup idle transitions for clkdm
> * @clkdm: struct clockdomain *
> diff --git a/arch/arm/mach-omap2/clockdomains.h b/arch/arm/mach-omap2/clockdomains.h
> index 8fc19ff..5e29de8 100644
> --- a/arch/arm/mach-omap2/clockdomains.h
> +++ b/arch/arm/mach-omap2/clockdomains.h
> @@ -663,6 +663,12 @@ static struct clockdomain iva2_clkdm = {
> .wkdep_srcs = iva2_wkdeps,
> .clktrctrl_mask = OMAP3430_CLKTRCTRL_IVA2_MASK,
> .omap_chip = OMAP_CHIP_INIT(CHIP_IS_OMAP3430),
> + .clk_reg_num = 1,
> + .idle_def = {
> + [0] = {
> + .idlest_mask = OMAP3430_ST_IVA2,
> + },
> + },
> };
>
> static struct clockdomain gfx_3430es1_clkdm = {
> @@ -686,6 +692,12 @@ static struct clockdomain sgx_clkdm = {
> .sleepdep_srcs = gfx_sgx_sleepdeps,
> .clktrctrl_mask = OMAP3430ES2_CLKTRCTRL_SGX_MASK,
> .omap_chip = OMAP_CHIP_INIT(CHIP_GE_OMAP3430ES2),
> + .clk_reg_num = 1,
> + .idle_def = {
> + [0] = {
> + .idlest_mask = OMAP3430ES2_ST_SGX_SHIFT,
> + },
> + },
> };
>
> /*
> @@ -717,6 +729,57 @@ static struct clockdomain core_l3_3xxx_clkdm = {
> .dep_bit = OMAP3430_EN_CORE_SHIFT,
> .clktrctrl_mask = OMAP3430_CLKTRCTRL_L3_MASK,
> .omap_chip = OMAP_CHIP_INIT(CHIP_IS_OMAP3430),
> + .clk_reg_num = 3,
> + .idle_def = {
> + [0] = {
> + /* UARTs are controlled by idle loop so ignore */
> + .fclk_ignore = OMAP3430_EN_UART2 |
> + OMAP3430_EN_UART1,
> + /*
> + * Reason for IDLEST ignores:
> + * - SDRC and OMAPCTRL controlled by HW
> + * - HSOTGUSB_IDLE bit is autoidled by HW
> + * - MAILBOX is controlled by HW
> + */
> + .idlest_mask =
> + OMAP3430ES2_ST_MMC3_MASK |
> + OMAP3430_ST_ICR_MASK |
> + OMAP3430_ST_AES2_MASK |
> + OMAP3430_ST_SHA12_MASK |
> + OMAP3430_ST_DES2_MASK |
> + OMAP3430_ST_MMC2_MASK |
> + OMAP3430_ST_MMC1_MASK |
> + OMAP3430_ST_MSPRO_MASK |
> + OMAP3430_ST_HDQ_MASK |
> + OMAP3430_ST_MCSPI4_MASK |
> + OMAP3430_ST_MCSPI3_MASK |
> + OMAP3430_ST_MCSPI2_MASK |
> + OMAP3430_ST_MCSPI1_MASK |
> + OMAP3430_ST_I2C3_MASK |
> + OMAP3430_ST_I2C2_MASK |
> + OMAP3430_ST_I2C1_MASK |
> + OMAP3430_ST_GPT11_MASK |
> + OMAP3430_ST_GPT10_MASK |
> + OMAP3430_ST_MCBSP5_MASK |
> + OMAP3430_ST_MCBSP1_MASK |
> + OMAP3430ES2_ST_SSI_IDLE_MASK |
> + OMAP3430ES2_ST_HSOTGUSB_STDBY_MASK |
> + OMAP3430_ST_D2D_MASK |
> + OMAP3430_ST_SDMA_MASK |
> + OMAP3430_ST_SSI_STDBY_MASK,
> + },
> + [1] = {
> + .idlest_mask = OMAP3430_ST_PKA_MASK |
> + OMAP3430_ST_AES1_MASK |
> + OMAP3430_ST_RNG_MASK |
> + OMAP3430_ST_SHA11_MASK |
> + OMAP3430_ST_DES1_MASK,
> + },
> + [2] = {
> + .idlest_mask = OMAP3430ES2_ST_USBTLL_MASK |
> + OMAP3430ES2_ST_CPEFUSE_MASK,
> + },
> + },
> };
>
> /*
> @@ -746,6 +809,13 @@ static struct clockdomain dss_3xxx_clkdm = {
> .sleepdep_srcs = dss_sleepdeps,
> .clktrctrl_mask = OMAP3430_CLKTRCTRL_DSS_MASK,
> .omap_chip = OMAP_CHIP_INIT(CHIP_IS_OMAP3430),
> + .clk_reg_num = 1,
> + .idle_def = {
> + [0] = {
> + .idlest_mask = OMAP3430ES2_ST_DSS_IDLE_MASK |
> + OMAP3430ES2_ST_DSS_STDBY_MASK,
> + },
> + },
> };
>
> static struct clockdomain cam_clkdm = {
> @@ -758,6 +828,12 @@ static struct clockdomain cam_clkdm = {
> .sleepdep_srcs = cam_sleepdeps,
> .clktrctrl_mask = OMAP3430_CLKTRCTRL_CAM_MASK,
> .omap_chip = OMAP_CHIP_INIT(CHIP_IS_OMAP3430),
> + .clk_reg_num = 1,
> + .idle_def = {
> + [0] = {
> + .idlest_mask = OMAP3430_ST_CAM,
> + },
> + },
> };
>
> static struct clockdomain usbhost_clkdm = {
> @@ -770,6 +846,13 @@ static struct clockdomain usbhost_clkdm = {
> .sleepdep_srcs = usbhost_sleepdeps,
> .clktrctrl_mask = OMAP3430ES2_CLKTRCTRL_USBHOST_MASK,
> .omap_chip = OMAP_CHIP_INIT(CHIP_GE_OMAP3430ES2),
> + .clk_reg_num = 1,
> + .idle_def = {
> + [0] = {
> + .idlest_mask = OMAP3430ES2_ST_USBHOST_IDLE_MASK |
> + OMAP3430ES2_ST_USBHOST_STDBY_MASK,
> + },
> + },
> };
>
> static struct clockdomain per_clkdm = {
> @@ -783,6 +866,29 @@ static struct clockdomain per_clkdm = {
> .sleepdep_srcs = per_sleepdeps,
> .clktrctrl_mask = OMAP3430_CLKTRCTRL_PER_MASK,
> .omap_chip = OMAP_CHIP_INIT(CHIP_IS_OMAP3430),
> + .clk_reg_num = 1,
> + .idle_def = {
> + [0] = {
> + .fclk_ignore = OMAP3430_ST_UART3_MASK,
> + /*
> + * GPIO2...6 are dropped out from this mask
> + * as they are always non-idle, UART3 is also
> + * out as it is handled by idle loop
> + * */
> + .idlest_mask = OMAP3430_ST_WDT3_MASK |
> + OMAP3430_ST_GPT9_MASK |
> + OMAP3430_ST_GPT8_MASK |
> + OMAP3430_ST_GPT7_MASK |
> + OMAP3430_ST_GPT6_MASK |
> + OMAP3430_ST_GPT5_MASK |
> + OMAP3430_ST_GPT4_MASK |
> + OMAP3430_ST_GPT3_MASK |
> + OMAP3430_ST_GPT2_MASK |
> + OMAP3430_ST_MCBSP4_MASK |
> + OMAP3430_ST_MCBSP3_MASK |
> + OMAP3430_ST_MCBSP2_MASK,
> + },
> + },
> };
>
> /*
> diff --git a/arch/arm/mach-omap2/powerdomain.c b/arch/arm/mach-omap2/powerdomain.c
> index dc03289..a9ca884 100644
> --- a/arch/arm/mach-omap2/powerdomain.c
> +++ b/arch/arm/mach-omap2/powerdomain.c
> @@ -919,6 +919,26 @@ int pwrdm_wait_transition(struct powerdomain *pwrdm)
> return 0;
> }
>
> +/**
> + * pwrdm_can_idle - check if the powerdomain can enter idle
> + * @pwrdm: struct powerdomain * the powerdomain to check status of
> + *
> + * Checks all associated clockdomains if they can idle or not.
> + * Returns 1 if the powerdomain can idle, 0 if not.
> + */
> +int pwrdm_can_idle(struct powerdomain *pwrdm)
> +{
> + int i;
> + int ret = 1;
> +
> + for (i = 0; i < PWRDM_MAX_CLKDMS; i++)
> + if (pwrdm->pwrdm_clkdms[i] &&
> + !omap2_clkdm_can_idle(pwrdm->pwrdm_clkdms[i]))
> + ret = 0;
> +
> + return ret;
> +}
> +
> int pwrdm_state_switch(struct powerdomain *pwrdm)
> {
> return _pwrdm_state_switch(pwrdm, PWRDM_STATE_NOW);
> diff --git a/arch/arm/plat-omap/include/plat/clockdomain.h b/arch/arm/plat-omap/include/plat/clockdomain.h
> index ba0a6c0..ecf7f88 100644
> --- a/arch/arm/plat-omap/include/plat/clockdomain.h
> +++ b/arch/arm/plat-omap/include/plat/clockdomain.h
> @@ -30,6 +30,12 @@
> #define CLKDM_CAN_SWSUP (CLKDM_CAN_FORCE_SLEEP | CLKDM_CAN_FORCE_WAKEUP)
> #define CLKDM_CAN_HWSUP_SWSUP (CLKDM_CAN_SWSUP | CLKDM_CAN_HWSUP)
>
> +/*
> + * Maximum number of FCLK register masks that can be associated with a
> + * clockdomain. CORE powerdomain on OMAP3 is the worst case
> + */
> +#define CLKDM_MAX_CLK_REGS 3
> +
> /* OMAP24XX CM_CLKSTCTRL_*.AUTOSTATE_* register bit values */
> #define OMAP24XX_CLKSTCTRL_DISABLE_AUTO 0x0
> #define OMAP24XX_CLKSTCTRL_ENABLE_AUTO 0x1
> @@ -82,6 +88,11 @@ struct clkdm_dep {
> const struct omap_chip_id omap_chip;
> };
>
> +struct clkdm_idle_def {
> + u32 fclk_ignore;
> + u32 idlest_mask;
> +};
> +
> /**
> * struct clockdomain - OMAP clockdomain
> * @name: clockdomain name
> @@ -95,6 +106,8 @@ struct clkdm_dep {
> * @omap_chip: OMAP chip types that this clockdomain is valid on
> * @usecount: Usecount tracking
> * @node: list_head to link all clockdomains together
> + * @clk_reg_num: Number of idle definitions for clockdomain idle status checks
> + * @idle_def: Declarations for idle checks for clockdomain
> */
> struct clockdomain {
> const char *name;
> @@ -111,6 +124,8 @@ struct clockdomain {
> const struct omap_chip_id omap_chip;
> atomic_t usecount;
> struct list_head node;
> + u8 clk_reg_num;
> + struct clkdm_idle_def idle_def[CLKDM_MAX_CLK_REGS];
> };
>
> void clkdm_init(struct clockdomain **clkdms, struct clkdm_autodep *autodeps);
> @@ -138,4 +153,6 @@ int omap2_clkdm_sleep(struct clockdomain *clkdm);
> int omap2_clkdm_clk_enable(struct clockdomain *clkdm, struct clk *clk);
> int omap2_clkdm_clk_disable(struct clockdomain *clkdm, struct clk *clk);
>
> +int omap2_clkdm_can_idle(struct clockdomain *clkdm);
> +
> #endif
> diff --git a/arch/arm/plat-omap/include/plat/powerdomain.h b/arch/arm/plat-omap/include/plat/powerdomain.h
> index e15c7e9..a1ecd47 100644
> --- a/arch/arm/plat-omap/include/plat/powerdomain.h
> +++ b/arch/arm/plat-omap/include/plat/powerdomain.h
> @@ -145,6 +145,7 @@ int pwrdm_disable_hdwr_sar(struct powerdomain *pwrdm);
> bool pwrdm_has_hdwr_sar(struct powerdomain *pwrdm);
>
> int pwrdm_wait_transition(struct powerdomain *pwrdm);
> +int pwrdm_can_idle(struct powerdomain *pwrdm);
>
> int pwrdm_state_switch(struct powerdomain *pwrdm);
> int pwrdm_clkdm_state_switch(struct clockdomain *clkdm);
> --
> 1.5.4.3
>
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