linux-kernel - RE: [PATCH v2 07/11] ARM: at91: pm: Tie the memory controller type to the ramc id

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Message-ID: <F9F4555C4E01D7469D37975B62D0EFBB51D7CA@CHN-SV-EXMX07.mchp-main.com>
Date:   Wed, 29 Mar 2017 04:53:53 +0000
From:   <Wenyou.Yang@...rochip.com>
To:     <alexandre.belloni@...e-electrons.com>,
        <Nicolas.Ferre@...rochip.com>
CC:     <linux-kernel@...r.kernel.org>,
        <linux-arm-kernel@...ts.infradead.org>,
        <boris.brezillon@...e-electrons.com>
Subject: RE: [PATCH v2 07/11] ARM: at91: pm: Tie the memory controller type
 to the ramc id



> -----Original Message-----
> From: Alexandre Belloni [mailto:alexandre.belloni@...e-electrons.com]
> Sent: 2017年3月28日 19:20
> To: Nicolas Ferre - M43238 <Nicolas.Ferre@...rochip.com>
> Cc: linux-kernel@...r.kernel.org; linux-arm-kernel@...ts.infradead.org; Boris
> Brezillon <boris.brezillon@...e-electrons.com>; Wenyou Yang - A41535
> <Wenyou.Yang@...rochip.com>; Alexandre Belloni <alexandre.belloni@...e-
> electrons.com>
> Subject: [PATCH v2 07/11] ARM: at91: pm: Tie the memory controller type to the
> ramc id
> 
> Instead of relying on the SoC type to select the memory controller type, use the
> device tree ids as they are parsed anyway.
> 
> Signed-off-by: Alexandre Belloni <alexandre.belloni@...e-electrons.com>

Acked-by: Wenyou Yang <wenyou.yang@...el.com>

> ---
>  arch/arm/mach-at91/pm.c | 30 ++++++++++++++++++++----------
>  1 file changed, 20 insertions(+), 10 deletions(-)
> 
> diff --git a/arch/arm/mach-at91/pm.c b/arch/arm/mach-at91/pm.c index
> 488549bc2bed..ddf62a006635 100644
> --- a/arch/arm/mach-at91/pm.c
> +++ b/arch/arm/mach-at91/pm.c
> @@ -329,11 +329,23 @@ static void at91sam9_sdram_standby(void)
>  		at91_ramc_write(1, AT91_SDRAMC_LPR, saved_lpr1);  }
> 
> +struct ramc_info {
> +	void (*idle)(void);
> +	unsigned int memctrl;
> +};
> +
> +static const struct ramc_info ramc_infos[] __initconst = {
> +	{ .idle = at91rm9200_standby, .memctrl = AT91_MEMCTRL_MC},
> +	{ .idle = at91sam9_sdram_standby, .memctrl =
> AT91_MEMCTRL_SDRAMC},
> +	{ .idle = at91_ddr_standby, .memctrl = AT91_MEMCTRL_DDRSDR},
> +	{ .idle = sama5d3_ddr_standby, .memctrl =
> AT91_MEMCTRL_DDRSDR}, };
> +
>  static const struct of_device_id const ramc_ids[] __initconst = {
> -	{ .compatible = "atmel,at91rm9200-sdramc", .data =
> at91rm9200_standby },
> -	{ .compatible = "atmel,at91sam9260-sdramc", .data =
> at91sam9_sdram_standby },
> -	{ .compatible = "atmel,at91sam9g45-ddramc", .data = at91_ddr_standby },
> -	{ .compatible = "atmel,sama5d3-ddramc", .data = sama5d3_ddr_standby },
> +	{ .compatible = "atmel,at91rm9200-sdramc", .data = &ramc_infos[0] },
> +	{ .compatible = "atmel,at91sam9260-sdramc", .data = &ramc_infos[1] },
> +	{ .compatible = "atmel,at91sam9g45-ddramc", .data = &ramc_infos[2] },
> +	{ .compatible = "atmel,sama5d3-ddramc", .data = &ramc_infos[3] },
>  	{ /*sentinel*/ }
>  };
> 
> @@ -343,14 +355,17 @@ static __init void at91_dt_ramc(void)
>  	const struct of_device_id *of_id;
>  	int idx = 0;
>  	const void *standby = NULL;
> +	const struct ramc_info *ramc;
> 
>  	for_each_matching_node_and_match(np, ramc_ids, &of_id) {
>  		pm_data.ramc[idx] = of_iomap(np, 0);
>  		if (!pm_data.ramc[idx])
>  			panic(pr_fmt("unable to map ramc[%d] cpu registers\n"),
> idx);
> 
> +		ramc = of_id->data;
>  		if (!standby)
> -			standby = of_id->data;
> +			standby = ramc->idle;
> +		pm_data.memctrl = ramc->memctrl;
> 
>  		idx++;
>  	}
> @@ -473,7 +488,6 @@ void __init at91rm9200_pm_init(void)
>  	at91_ramc_write(0, AT91_MC_SDRAMC_LPR, 0);
> 
>  	pm_data.uhp_udp_mask = AT91RM9200_PMC_UHP |
> AT91RM9200_PMC_UDP;
> -	pm_data.memctrl = AT91_MEMCTRL_MC;
> 
>  	at91_pm_init(at91rm9200_idle);
>  }
> @@ -481,7 +495,6 @@ void __init at91rm9200_pm_init(void)  void __init
> at91sam9260_pm_init(void)  {
>  	at91_dt_ramc();
> -	pm_data.memctrl = AT91_MEMCTRL_SDRAMC;
>  	pm_data.uhp_udp_mask = AT91SAM926x_PMC_UHP |
> AT91SAM926x_PMC_UDP;
>  	at91_pm_init(at91sam9_idle);
>  }
> @@ -490,7 +503,6 @@ void __init at91sam9g45_pm_init(void)  {
>  	at91_dt_ramc();
>  	pm_data.uhp_udp_mask = AT91SAM926x_PMC_UHP;
> -	pm_data.memctrl = AT91_MEMCTRL_DDRSDR;
>  	at91_pm_init(at91sam9_idle);
>  }
> 
> @@ -498,7 +510,6 @@ void __init at91sam9x5_pm_init(void)  {
>  	at91_dt_ramc();
>  	pm_data.uhp_udp_mask = AT91SAM926x_PMC_UHP |
> AT91SAM926x_PMC_UDP;
> -	pm_data.memctrl = AT91_MEMCTRL_DDRSDR;
>  	at91_pm_init(at91sam9_idle);
>  }
> 
> @@ -506,6 +517,5 @@ void __init sama5_pm_init(void)  {
>  	at91_dt_ramc();
>  	pm_data.uhp_udp_mask = AT91SAM926x_PMC_UHP |
> AT91SAM926x_PMC_UDP;
> -	pm_data.memctrl = AT91_MEMCTRL_DDRSDR;
>  	at91_pm_init(NULL);
>  }
> --
> 2.11.0


Best Regards,
Wenyou Yang