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Message-ID: <550FE79C.6050305@atmel.com>
Date: Mon, 23 Mar 2015 11:14:52 +0100
From: Nicolas Ferre <nicolas.ferre@...el.com>
To: Alexandre Belloni <alexandre.belloni@...e-electrons.com>
CC: Lee Jones <lee.jones@...aro.org>,
Boris Brezillon <boris.brezillon@...e-electrons.com>,
Jean-Christophe Plagniol-Villard <plagnioj@...osoft.com>,
<linux-kernel@...r.kernel.org>, Tejun Heo <tj@...nel.org>,
<linux-ide@...r.kernel.org>, <linux-pcmcia@...ts.infradead.org>,
<linux-arm-kernel@...ts.infradead.org>
Subject: Re: [PATCH 01/10] ARM: at91/pm: move the standby functions to pm.c
Le 16/03/2015 23:44, Alexandre Belloni a écrit :
> The standby functions are now only used in pm.c, move them there.
>
> Also, they are not inlined as a pointer to those functions is passed to the
> cpuidle driver.
>
> Signed-off-by: Alexandre Belloni <alexandre.belloni@...e-electrons.com>
Acked-by: Nicolas Ferre <nicolas.ferre@...el.com>
> ---
> arch/arm/mach-at91/pm.c | 89 +++++++++++++++++++++++++++++++++++++++++++++++
> arch/arm/mach-at91/pm.h | 92 -------------------------------------------------
> 2 files changed, 89 insertions(+), 92 deletions(-)
>
> diff --git a/arch/arm/mach-at91/pm.c b/arch/arm/mach-at91/pm.c
> index f93a735ba327..5062699cbb12 100644
> --- a/arch/arm/mach-at91/pm.c
> +++ b/arch/arm/mach-at91/pm.c
> @@ -222,6 +222,95 @@ static void at91_pm_set_standby(void (*at91_standby)(void))
> at91_cpuidle_device.dev.platform_data = at91_standby;
> }
>
> +/*
> + * The AT91RM9200 goes into self-refresh mode with this command, and will
> + * terminate self-refresh automatically on the next SDRAM access.
> + *
> + * Self-refresh mode is exited as soon as a memory access is made, but we don't
> + * know for sure when that happens. However, we need to restore the low-power
> + * mode if it was enabled before going idle. Restoring low-power mode while
> + * still in self-refresh is "not recommended", but seems to work.
> + */
> +static void at91rm9200_standby(void)
> +{
> + u32 lpr = at91_ramc_read(0, AT91RM9200_SDRAMC_LPR);
> +
> + asm volatile(
> + "b 1f\n\t"
> + ".align 5\n\t"
> + "1: mcr p15, 0, %0, c7, c10, 4\n\t"
> + " str %0, [%1, %2]\n\t"
> + " str %3, [%1, %4]\n\t"
> + " mcr p15, 0, %0, c7, c0, 4\n\t"
> + " str %5, [%1, %2]"
> + :
> + : "r" (0), "r" (at91_ramc_base[0]), "r" (AT91RM9200_SDRAMC_LPR),
> + "r" (1), "r" (AT91RM9200_SDRAMC_SRR),
> + "r" (lpr));
> +}
> +
> +/* We manage both DDRAM/SDRAM controllers, we need more than one value to
> + * remember.
> + */
> +static void at91_ddr_standby(void)
> +{
> + /* Those two values allow us to delay self-refresh activation
> + * to the maximum. */
> + u32 lpr0, lpr1 = 0;
> + u32 saved_lpr0, saved_lpr1 = 0;
> +
> + if (at91_ramc_base[1]) {
> + saved_lpr1 = at91_ramc_read(1, AT91_DDRSDRC_LPR);
> + lpr1 = saved_lpr1 & ~AT91_DDRSDRC_LPCB;
> + lpr1 |= AT91_DDRSDRC_LPCB_SELF_REFRESH;
> + }
> +
> + saved_lpr0 = at91_ramc_read(0, AT91_DDRSDRC_LPR);
> + lpr0 = saved_lpr0 & ~AT91_DDRSDRC_LPCB;
> + lpr0 |= AT91_DDRSDRC_LPCB_SELF_REFRESH;
> +
> + /* self-refresh mode now */
> + at91_ramc_write(0, AT91_DDRSDRC_LPR, lpr0);
> + if (at91_ramc_base[1])
> + at91_ramc_write(1, AT91_DDRSDRC_LPR, lpr1);
> +
> + cpu_do_idle();
> +
> + at91_ramc_write(0, AT91_DDRSDRC_LPR, saved_lpr0);
> + if (at91_ramc_base[1])
> + at91_ramc_write(1, AT91_DDRSDRC_LPR, saved_lpr1);
> +}
> +
> +/* We manage both DDRAM/SDRAM controllers, we need more than one value to
> + * remember.
> + */
> +static void at91sam9_sdram_standby(void)
> +{
> + u32 lpr0, lpr1 = 0;
> + u32 saved_lpr0, saved_lpr1 = 0;
> +
> + if (at91_ramc_base[1]) {
> + saved_lpr1 = at91_ramc_read(1, AT91_SDRAMC_LPR);
> + lpr1 = saved_lpr1 & ~AT91_SDRAMC_LPCB;
> + lpr1 |= AT91_SDRAMC_LPCB_SELF_REFRESH;
> + }
> +
> + saved_lpr0 = at91_ramc_read(0, AT91_SDRAMC_LPR);
> + lpr0 = saved_lpr0 & ~AT91_SDRAMC_LPCB;
> + lpr0 |= AT91_SDRAMC_LPCB_SELF_REFRESH;
> +
> + /* self-refresh mode now */
> + at91_ramc_write(0, AT91_SDRAMC_LPR, lpr0);
> + if (at91_ramc_base[1])
> + at91_ramc_write(1, AT91_SDRAMC_LPR, lpr1);
> +
> + cpu_do_idle();
> +
> + at91_ramc_write(0, AT91_SDRAMC_LPR, saved_lpr0);
> + if (at91_ramc_base[1])
> + at91_ramc_write(1, AT91_SDRAMC_LPR, saved_lpr1);
> +}
> +
> static const struct of_device_id ramc_ids[] __initconst = {
> { .compatible = "atmel,at91rm9200-sdramc", .data = at91rm9200_standby },
> { .compatible = "atmel,at91sam9260-sdramc", .data = at91sam9_sdram_standby },
> diff --git a/arch/arm/mach-at91/pm.h b/arch/arm/mach-at91/pm.h
> index dcacfa1ad3fa..3223967d3460 100644
> --- a/arch/arm/mach-at91/pm.h
> +++ b/arch/arm/mach-at91/pm.h
> @@ -23,96 +23,4 @@
>
> #define AT91_PM_SLOW_CLOCK 0x01
>
> -/*
> - * The AT91RM9200 goes into self-refresh mode with this command, and will
> - * terminate self-refresh automatically on the next SDRAM access.
> - *
> - * Self-refresh mode is exited as soon as a memory access is made, but we don't
> - * know for sure when that happens. However, we need to restore the low-power
> - * mode if it was enabled before going idle. Restoring low-power mode while
> - * still in self-refresh is "not recommended", but seems to work.
> - */
> -
> -#ifndef __ASSEMBLY__
> -static inline void at91rm9200_standby(void)
> -{
> - u32 lpr = at91_ramc_read(0, AT91RM9200_SDRAMC_LPR);
> -
> - asm volatile(
> - "b 1f\n\t"
> - ".align 5\n\t"
> - "1: mcr p15, 0, %0, c7, c10, 4\n\t"
> - " str %0, [%1, %2]\n\t"
> - " str %3, [%1, %4]\n\t"
> - " mcr p15, 0, %0, c7, c0, 4\n\t"
> - " str %5, [%1, %2]"
> - :
> - : "r" (0), "r" (at91_ramc_base[0]), "r" (AT91RM9200_SDRAMC_LPR),
> - "r" (1), "r" (AT91RM9200_SDRAMC_SRR),
> - "r" (lpr));
> -}
> -
> -/* We manage both DDRAM/SDRAM controllers, we need more than one value to
> - * remember.
> - */
> -static inline void at91_ddr_standby(void)
> -{
> - /* Those two values allow us to delay self-refresh activation
> - * to the maximum. */
> - u32 lpr0, lpr1 = 0;
> - u32 saved_lpr0, saved_lpr1 = 0;
> -
> - if (at91_ramc_base[1]) {
> - saved_lpr1 = at91_ramc_read(1, AT91_DDRSDRC_LPR);
> - lpr1 = saved_lpr1 & ~AT91_DDRSDRC_LPCB;
> - lpr1 |= AT91_DDRSDRC_LPCB_SELF_REFRESH;
> - }
> -
> - saved_lpr0 = at91_ramc_read(0, AT91_DDRSDRC_LPR);
> - lpr0 = saved_lpr0 & ~AT91_DDRSDRC_LPCB;
> - lpr0 |= AT91_DDRSDRC_LPCB_SELF_REFRESH;
> -
> - /* self-refresh mode now */
> - at91_ramc_write(0, AT91_DDRSDRC_LPR, lpr0);
> - if (at91_ramc_base[1])
> - at91_ramc_write(1, AT91_DDRSDRC_LPR, lpr1);
> -
> - cpu_do_idle();
> -
> - at91_ramc_write(0, AT91_DDRSDRC_LPR, saved_lpr0);
> - if (at91_ramc_base[1])
> - at91_ramc_write(1, AT91_DDRSDRC_LPR, saved_lpr1);
> -}
> -
> -/* We manage both DDRAM/SDRAM controllers, we need more than one value to
> - * remember.
> - */
> -static inline void at91sam9_sdram_standby(void)
> -{
> - u32 lpr0, lpr1 = 0;
> - u32 saved_lpr0, saved_lpr1 = 0;
> -
> - if (at91_ramc_base[1]) {
> - saved_lpr1 = at91_ramc_read(1, AT91_SDRAMC_LPR);
> - lpr1 = saved_lpr1 & ~AT91_SDRAMC_LPCB;
> - lpr1 |= AT91_SDRAMC_LPCB_SELF_REFRESH;
> - }
> -
> - saved_lpr0 = at91_ramc_read(0, AT91_SDRAMC_LPR);
> - lpr0 = saved_lpr0 & ~AT91_SDRAMC_LPCB;
> - lpr0 |= AT91_SDRAMC_LPCB_SELF_REFRESH;
> -
> - /* self-refresh mode now */
> - at91_ramc_write(0, AT91_SDRAMC_LPR, lpr0);
> - if (at91_ramc_base[1])
> - at91_ramc_write(1, AT91_SDRAMC_LPR, lpr1);
> -
> - cpu_do_idle();
> -
> - at91_ramc_write(0, AT91_SDRAMC_LPR, saved_lpr0);
> - if (at91_ramc_base[1])
> - at91_ramc_write(1, AT91_SDRAMC_LPR, saved_lpr1);
> -}
> -
> -#endif
> #endif
>
--
Nicolas Ferre
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