Re: [PATCH 2/2] ARM: at91/pm: add ultra Low-power mode 1(ULP1) support

From: Michael Turquette
Date: Thu Oct 15 2015 - 05:32:23 EST

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In reply to: Wenyou Yang: "[PATCH 2/2] ARM: at91/pm: add ultra Low-power mode 1(ULP1) support"
Next in thread: Alexandre Belloni: "Re: [PATCH 2/2] ARM: at91/pm: add ultra Low-power mode 1(ULP1) support"
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Quoting Wenyou Yang (2015-10-14 20:41:07)
> The Ultra Low-power mode 1(ULP1) is introduced by SAMA5D2.
>
> In the ULP1 mode, all the clocks are shut off, inclusive the embedded
> 12MHz RC oscillator, so as to achieve the lowest power consumption
> with the system in retention mode and able to resume on the wake up
> events. As soon as the wake up event is asserted, the embedded 12MHz
> RC oscillator restarts automatically.
>
> The number of wake up sources for the ULP1 mode is limited, the wake
> up sources should be configured via the PMC_FSMR and PMC_FSPR
> registers.
>
> In this patch, the following wake up sources are enabled,
> - WKUP0 pin
> - WKUP1 pin to WKUP8 pin (shared with PIOBU0 to PIOBU7)
> - RTC alarm
>
> Signed-off-by: Wenyou Yang <wenyou.yang@xxxxxxxxx>

For the changes to the clk header:

Acked-by: Michael Turquette <mturquette@xxxxxxxxxxxx>

> ---
>
> arch/arm/mach-at91/pm.c | 29 ++++++++++
> arch/arm/mach-at91/pm.h | 7 +++
> arch/arm/mach-at91/pm_suspend.S | 111 +++++++++++++++++++++++++++++++++++++++
> include/linux/clk/at91_pmc.h | 36 +++++++++++++
> 4 files changed, 183 insertions(+)
>
> diff --git a/arch/arm/mach-at91/pm.c b/arch/arm/mach-at91/pm.c
> index 80e277c..49443d9 100644
> --- a/arch/arm/mach-at91/pm.c
> +++ b/arch/arm/mach-at91/pm.c
> @@ -35,6 +35,11 @@
> #include "generic.h"
> #include "pm.h"
>
> +#define ULP0_MODE 0x00
> +#define ULP1_MODE 0x11
> +
> +#define SAMA5D2_PMC_VERSION 0x20540
> +
> /*
> * FIXME: this is needed to communicate between the pinctrl driver and
> * the PM implementation in the machine. Possibly part of the PM
> @@ -64,6 +69,23 @@ static int at91_pm_valid_state(suspend_state_t state)
> }
> }
>
> +static void at91_config_ulp1_wkup_source(void)
> +{
> + if (at91_pmc_read(AT91_PMC_VERSION) >= SAMA5D2_PMC_VERSION) {
> + at91_pmc_write(AT91_PMC_FSMR, AT91_PMC_RTCAL |
> + AT91_PMC_FSTT9 |
> + AT91_PMC_FSTT8 |
> + AT91_PMC_FSTT7 |
> + AT91_PMC_FSTT6 |
> + AT91_PMC_FSTT5 |
> + AT91_PMC_FSTT4 |
> + AT91_PMC_FSTT3 |
> + AT91_PMC_FSTT2 |
> + AT91_PMC_FSTT0);
> +
> + at91_pmc_write(AT91_PMC_FSPR, 0);
> + }
> +}
>
> static suspend_state_t target_state;
>
> @@ -73,6 +95,9 @@ static suspend_state_t target_state;
> static int at91_pm_begin(suspend_state_t state)
> {
> target_state = state;
> +
> + at91_config_ulp1_wkup_source();
> +
> return 0;
> }
>
> @@ -140,6 +165,10 @@ static void at91_pm_suspend(suspend_state_t state)
> pm_data |= (state == PM_SUSPEND_MEM) ?
> AT91_PM_MODE(AT91_PM_SLOW_CLOCK) : 0;
>
> + pm_data |= ((state == PM_SUSPEND_MEM) &&
> + (at91_pmc_read(AT91_PMC_VERSION) >= SAMA5D2_PMC_VERSION)) ?
> + AT91_PM_ULP(AT91_PM_ULP1_MODE) : 0;
> +
> flush_cache_all();
> outer_disable();
>
> diff --git a/arch/arm/mach-at91/pm.h b/arch/arm/mach-at91/pm.h
> index 3fcf881..2e76745 100644
> --- a/arch/arm/mach-at91/pm.h
> +++ b/arch/arm/mach-at91/pm.h
> @@ -39,4 +39,11 @@ extern void __iomem *at91_ramc_base[];
>
> #define AT91_PM_SLOW_CLOCK 0x01
>
> +#define AT91_PM_ULP_OFFSET 5
> +#define AT91_PM_ULP_MASK 0x03
> +#define AT91_PM_ULP(x) (((x) & AT91_PM_ULP_MASK) << AT91_PM_ULP_OFFSET)
> +
> +#define AT91_PM_ULP0_MODE 0x00
> +#define AT91_PM_ULP1_MODE 0x01
> +
> #endif
> diff --git a/arch/arm/mach-at91/pm_suspend.S b/arch/arm/mach-at91/pm_suspend.S
> index 825347b..543c430 100644
> --- a/arch/arm/mach-at91/pm_suspend.S
> +++ b/arch/arm/mach-at91/pm_suspend.S
> @@ -41,6 +41,15 @@ tmp2 .req r5
> .endm
>
> /*
> + * Wait for main oscillator selection is done
> + */
> + .macro wait_moscsels
> +1: ldr tmp1, [pmc, #AT91_PMC_SR]
> + tst tmp1, #AT91_PMC_MOSCSELS
> + beq 1b
> + .endm
> +
> +/*
> * Wait until PLLA has locked.
> */
> .macro wait_pllalock
> @@ -99,6 +108,10 @@ ENTRY(at91_pm_suspend_in_sram)
> and r0, r0, #AT91_PM_MODE_MASK
> str r0, .pm_mode
>
> + lsr r0, r3, #AT91_PM_ULP_OFFSET
> + and r0, r0, #AT91_PM_ULP_MASK
> + str r0, .ulp_mode
> +
> /* Active the self-refresh mode */
> mov r0, #SRAMC_SELF_FRESH_ACTIVE
> bl at91_sramc_self_refresh
> @@ -107,6 +120,14 @@ ENTRY(at91_pm_suspend_in_sram)
> tst r0, #AT91_PM_SLOW_CLOCK
> beq standby_mode
>
> + ldr r0, .ulp_mode
> + tst r0, #AT91_PM_ULP1_MODE
> + beq ulp0_mode
> +
> +ulp1_mode:
> + bl at91_pm_ulp1_mode
> + b pm_exit
> +
> ulp0_mode:
> bl at91_pm_ulp0_mode
> b pm_exit
> @@ -313,6 +334,94 @@ ENTRY(at91_pm_ulp0_mode)
> mov pc, lr
> ENDPROC(at91_pm_ulp0_mode)
>
> +/*
> + * void at91_pm_ulp1_mode(void)
> + *
> + */
> +ENTRY(at91_pm_ulp1_mode)
> + ldr pmc, .pmc_base
> +
> + /* Save PMC_MCKR config */
> + ldr tmp1, [pmc, #AT91_PMC_MCKR]
> + str tmp1, .saved_mckr
> +
> + /* Switch the master clock source to main clock */
> + bic tmp1, tmp1, #AT91_PMC_CSS
> + orr tmp1, tmp1, #AT91_PMC_CSS_MAIN
> + str tmp1, [pmc, #AT91_PMC_MCKR]
> +
> + wait_mckrdy
> +
> + /* Save PLLA config, then and disable PLLA */
> + ldr tmp1, [pmc, #AT91_CKGR_PLLAR]
> + str tmp1, .saved_pllar
> +
> + bic tmp1, tmp1, #AT91_PMC3_MUL
> + str tmp1, [pmc, #AT91_CKGR_PLLAR]
> +
> + /* Switch main clock to 12-MHz RC oscillator */
> + ldr tmp1, [pmc, #AT91_CKGR_MOR]
> + bic tmp1, tmp1, #AT91_PMC_MOSCSEL
> + bic tmp1, tmp1, #AT91_PMC_KEY_MASK
> + orr tmp1, tmp1, #AT91_PMC_KEY
> + bic tmp1, tmp1, #(7 << 4)
> + str tmp1, [pmc, #AT91_CKGR_MOR]
> +
> + wait_moscsels
> +
> + /* Disable the main oscillator */
> + ldr tmp1, [pmc, #AT91_CKGR_MOR]
> + bic tmp1, tmp1, #AT91_PMC_MOSCEN
> + bic tmp1, tmp1, #AT91_PMC_KEY_MASK
> + orr tmp1, tmp1, #AT91_PMC_KEY
> + bic tmp1, tmp1, #(7 << 4)
> + str tmp1, [pmc, #AT91_CKGR_MOR]
> +
> + /* Enter the ULP1 mode by setting WAITMODE bit in CKGR_MOR */
> + ldr tmp1, [pmc, #AT91_CKGR_MOR]
> + orr tmp1, tmp1, #AT91_PMC_WAITMODE
> + bic tmp1, tmp1, #AT91_PMC_KEY_MASK
> + orr tmp1, tmp1, #AT91_PMC_KEY
> + bic tmp1, tmp1, #(7 << 4)
> + str tmp1, [pmc, #AT91_CKGR_MOR]
> +
> + wait_mckrdy
> +
> + /* Enable the main oscillator */
> + ldr tmp1, [pmc, #AT91_CKGR_MOR]
> + orr tmp1, tmp1, #AT91_PMC_MOSCEN
> + bic tmp1, tmp1, #AT91_PMC_KEY_MASK
> + orr tmp1, tmp1, #AT91_PMC_KEY
> + bic tmp1, tmp1, #(7 << 4)
> + str tmp1, [pmc, #AT91_CKGR_MOR]
> +
> + wait_moscrdy
> +
> + /* Switch main clock to the main oscillator */
> + ldr tmp1, [pmc, #AT91_CKGR_MOR]
> + orr tmp1, tmp1, #AT91_PMC_MOSCSEL
> + bic tmp1, tmp1, #AT91_PMC_KEY_MASK
> + orr tmp1, tmp1, #AT91_PMC_KEY
> + bic tmp1, tmp1, #(7 << 4)
> + str tmp1, [pmc, #AT91_CKGR_MOR]
> +
> + wait_moscsels
> +
> + /* Restore PLLA config */
> + ldr tmp1, .saved_pllar
> + str tmp1, [pmc, #AT91_CKGR_PLLAR]
> +
> + wait_pllalock
> +
> + /* Restore PMC_MCKR config */
> + ldr tmp1, .saved_mckr
> + str tmp1, [pmc, #AT91_PMC_MCKR]
> +
> + wait_mckrdy
> +
> + mov pc, lr
> +ENDPROC(at91_pm_ulp1_mode)
> +
> .pmc_base:
> .word 0
> .sramc_base:
> @@ -323,6 +432,8 @@ ENDPROC(at91_pm_ulp0_mode)
> .word 0
> .pm_mode:
> .word 0
> +.ulp_mode:
> + .word 0
> .saved_mckr:
> .word 0
> .saved_pllar:
> diff --git a/include/linux/clk/at91_pmc.h b/include/linux/clk/at91_pmc.h
> index 7669f76..3dc4e60 100644
> --- a/include/linux/clk/at91_pmc.h
> +++ b/include/linux/clk/at91_pmc.h
> @@ -59,8 +59,10 @@ extern void __iomem *at91_pmc_base;
> #define AT91_CKGR_MOR 0x20 /* Main Oscillator Register [not on SAM9RL] */
> #define AT91_PMC_MOSCEN (1 << 0) /* Main Oscillator Enable */
> #define AT91_PMC_OSCBYPASS (1 << 1) /* Oscillator Bypass */
> +#define AT91_PMC_WAITMODE (1 << 2) /* Wait Mode Command */
> #define AT91_PMC_MOSCRCEN (1 << 3) /* Main On-Chip RC Oscillator Enable [some SAM9] */
> #define AT91_PMC_OSCOUNT (0xff << 8) /* Main Oscillator Start-up Time */
> +#define AT91_PMC_KEY_MASK (0xff << 16)
> #define AT91_PMC_KEY (0x37 << 16) /* MOR Writing Key */
> #define AT91_PMC_MOSCSEL (1 << 24) /* Main Oscillator Selection [some SAM9] */
> #define AT91_PMC_CFDEN (1 << 25) /* Clock Failure Detector Enable [some SAM9] */
> @@ -166,6 +168,38 @@ extern void __iomem *at91_pmc_base;
> #define AT91_PMC_CFDEV (1 << 18) /* Clock Failure Detector Event [some SAM9] */
> #define AT91_PMC_IMR 0x6c /* Interrupt Mask Register */
>
> +#define AT91_PMC_FSMR 0x70 /* Fast Startup Mode Register */
> +#define AT91_PMC_FSTT0 (1 << 0) /* Fast Startup from WKUP Pin Enable */
> +#define AT91_PMC_FSTT1 (1 << 1) /* Fast Startup from Security Module Enable */
> +#define AT91_PMC_FSTT2 (1 << 2) /* Fast Startup from PIOBU0 Input Enable */
> +#define AT91_PMC_FSTT3 (1 << 3) /* Fast Startup from PIOBU1 Input Enable */
> +#define AT91_PMC_FSTT4 (1 << 4) /* Fast Startup from PIOBU2 Input Enable */
> +#define AT91_PMC_FSTT5 (1 << 5) /* Fast Startup from PIOBU3 Input Enable */
> +#define AT91_PMC_FSTT6 (1 << 6) /* Fast Startup from PIOBU4 Input Enable */
> +#define AT91_PMC_FSTT7 (1 << 7) /* Fast Startup from PIOBU5 Input Enable */
> +#define AT91_PMC_FSTT8 (1 << 8) /* Fast Startup from PIOBU6 Input Enable */
> +#define AT91_PMC_FSTT9 (1 << 9) /* Fast Startup from PIOBU7 Input Enable */
> +#define AT91_PMC_FSTT10 (1 << 10) /* Fast Startup from GMAC Wake-up On LAN Enable */
> +#define AT91_PMC_RTCAL (1 << 17) /* Fast Startup from RTC Alarm Enable */
> +#define AT91_PMC_USBAL (1 << 18) /* Fast Startup from USB Resume Enable */
> +#define AT91_PMC_SDMMC_CD (1 << 19) /* Fast Startup from SDMMC Card Detect Enable */
> +#define AT91_PMC_LPM (1 << 20) /* Low-power Mode */
> +#define AT91_PMC_RXLP_MCE (1 << 24) /* Fast Startup from Backup UART Receive Match Condition Enable */
> +#define AT91_PMC_ACC_CE (1 << 25) /* Fast Startup from Analog Comparator Controller Comparison Enable*/
> +
> +#define AT91_PMC_FSPR 0x74 /* Fast Startup Polarity Register */
> +#define AT91_PMC_FSTP0 (1 << 0) /* WKUP Pin Polarity for Fast Startup */
> +#define AT91_PMC_FSTP1 (1 << 1) /* Security Module Polarity for Fast Startup */
> +#define AT91_PMC_FSTP2 (1 << 2) /* PIOBU0 Pin Polarity for Fast Startup */
> +#define AT91_PMC_FSTP3 (1 << 3) /* PIOBU1 Pin Polarity for Fast Startup */
> +#define AT91_PMC_FSTP4 (1 << 4) /* PIOBU2 Pin Polarity for Fast Startup */
> +#define AT91_PMC_FSTP5 (1 << 5) /* PIOBU3 Pin Polarity for Fast Startup */
> +#define AT91_PMC_FSTP6 (1 << 6) /* PIOBU4 Pin Polarity for Fast Startup */
> +#define AT91_PMC_FSTP7 (1 << 7) /* PIOBU5 Pin Polarity for Fast Startup */
> +#define AT91_PMC_FSTP8 (1 << 8) /* PIOBU6 Pin Polarity for Fast Startup */
> +#define AT91_PMC_FSTP9 (1 << 9) /* PIOBU7 Pin Polarity for Fast Startup */
> +#define AT91_PMC_FSTP10 (1 << 10) /* GMAC Wake-up On LAN Polarity for Fast Startup */
> +
> #define AT91_PMC_PLLICPR 0x80 /* PLL Charge Pump Current Register */
>
> #define AT91_PMC_PROT 0xe4 /* Write Protect Mode Register [some SAM9] */
> @@ -177,6 +211,8 @@ extern void __iomem *at91_pmc_base;
> #define AT91_PMC_WPVS (0x1 << 0) /* Write Protect Violation Status */
> #define AT91_PMC_WPVSRC (0xffff << 8) /* Write Protect Violation Source */
>
> +#define AT91_PMC_VERSION 0xfc
> +
> #define AT91_PMC_PCER1 0x100 /* Peripheral Clock Enable Register 1 [SAMA5 only]*/
> #define AT91_PMC_PCDR1 0x104 /* Peripheral Clock Enable Register 1 */
> #define AT91_PMC_PCSR1 0x108 /* Peripheral Clock Enable Register 1 */
> --
> 1.7.9.5
>
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Next message: Hans Verkuil: "Re: [PATCH] media: vb2: Allow reqbufs(0) with "in use" MMAP buffers"
Previous message: Shengjiu Wang: "[PATCH V2] ARM: SWP emulation: Restore original *data when failed"
In reply to: Wenyou Yang: "[PATCH 2/2] ARM: at91/pm: add ultra Low-power mode 1(ULP1) support"
Next in thread: Alexandre Belloni: "Re: [PATCH 2/2] ARM: at91/pm: add ultra Low-power mode 1(ULP1) support"
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