linux-kernel - Re: [PATCH v5 07/14] ARM: mvebu: Extend the pmsu registers

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Date:	Tue, 25 Mar 2014 20:30:27 -0400
From:	Jason Cooper <jason@...edaemon.net>
To:	Gregory CLEMENT <gregory.clement@...e-electrons.com>
Cc:	Daniel Lezcano <daniel.lezcano@...aro.org>,
	"Rafael J. Wysocki" <rjw@...ysocki.net>, linux-pm@...r.kernel.org,
	Andrew Lunn <andrew@...n.ch>,
	Sebastian Hesselbarth <sebastian.hesselbarth@...il.com>,
	Thomas Petazzoni <thomas.petazzoni@...e-electrons.com>,
	Ezequiel Garcia <ezequiel.garcia@...e-electrons.com>,
	linux-arm-kernel@...ts.infradead.org,
	Lior Amsalem <alior@...vell.com>,
	Tawfik Bayouk <tawfik@...vell.com>,
	Nadav Haklai <nadavh@...vell.com>, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v5 07/14] ARM: mvebu: Extend the pmsu registers

On Tue, Mar 25, 2014 at 11:48:18PM +0100, Gregory CLEMENT wrote:
> The initial binding for PMSU were wrong. It didn't take into account
> all the registers from the PMSU and moreover it referred to registers
> which are not part of PMSU.
> 
> The Power Management Unit Service block also controls the Coherency
> Fabric subsystem. These registers are needed for the CPU idle
> implementation for the Armada 370/XP, it allows to enter a deep CPU
> idle state where the Coherency Fabric and the L2 cache are powered
> down.
> 
> This commit add support for a new compatible for the PMSU node
> including the block related to the coherency fabric. It also keeps
> compatibility with the old binding
> 
> This patch also adds warnings if one of the base registers set can't
> be ioremapped.
> 
> Signed-off-by: Gregory CLEMENT <gregory.clement@...e-electrons.com>
> ---
>  arch/arm/mach-mvebu/pmsu.c | 47 +++++++++++++++++++++++++++++++++++++++++-----
>  1 file changed, 42 insertions(+), 5 deletions(-)
> 
> diff --git a/arch/arm/mach-mvebu/pmsu.c b/arch/arm/mach-mvebu/pmsu.c
> index d71ef53107c4..865bcb651e01 100644
> --- a/arch/arm/mach-mvebu/pmsu.c
> +++ b/arch/arm/mach-mvebu/pmsu.c
> @@ -27,11 +27,21 @@
>  static void __iomem *pmsu_mp_base;
>  static void __iomem *pmsu_reset_base;
>  
> -#define PMSU_BOOT_ADDR_REDIRECT_OFFSET(cpu)	((cpu * 0x100) + 0x24)
> +#define PMSU_BASE_OFFSET    0x100
> +#define PMSU_REG_SIZE	    0x1000
> +
> +#define PMSU_BOOT_ADDR_REDIRECT_OFFSET(cpu)	((cpu * 0x100) + 0x124)
>  #define PMSU_RESET_CTL_OFFSET(cpu)		(cpu * 0x8)
>  
>  static struct of_device_id of_pmsu_table[] = {
> -	{.compatible = "marvell,armada-370-xp-pmsu"},
> +	{
> +		.compatible = "marvell,armada-370-pmsu",
> +		.data = (void *) false,

This looks sketchy to me.

> +	},
> +	{
> +		.compatible = "marvell,armada-370-xp-pmsu",
> +		.data = (void *) true, /* legacy */

Same.

> +	},
>  	{ /* end of list */ },
>  };
>  
> @@ -59,15 +69,42 @@ int armada_xp_boot_cpu(unsigned int cpu_id, void *boot_addr)
>  }
>  #endif
>  
> +static void __init armada_370_xp_pmsu_legacy_init(struct device_node *np)
> +{
> +	u32 addr;
> +	pr_warn("*** Warning ***  Using an old binding which will be deprecated\n");

This should be noted in the binding docs...

> +	/* We just need the adress, we already know the size */

nit. s/adress/address/

> +	addr = be32_to_cpu(*of_get_address(np, 0, NULL, NULL));
> +	addr -= PMSU_BASE_OFFSET;
> +	pmsu_mp_base = ioremap(addr, PMSU_REG_SIZE);
> +	of_node_put(np);
> +}
> +
>  static int __init armada_370_xp_pmsu_init(void)
>  {
>  	struct device_node *np;
> -

Please leave this empty line.

>  	np = of_find_matching_node(NULL, of_pmsu_table);
>  	if (np) {
> +		const struct of_device_id *match =
> +			of_match_node(of_pmsu_table, np);
> +		BUG_ON(!match);
> +
>  		pr_info("Initializing Power Management Service Unit\n");
> -		pmsu_mp_base = of_iomap(np, 0);
> -		pmsu_reset_base = of_iomap(np, 1);
> +
> +		if (match->data) /* legacy */
> +			armada_370_xp_pmsu_legacy_init(np);

And if a new compatible string actually needs data passed?

> +		else
> +			pmsu_mp_base = of_iomap(np, 0);
> +		WARN_ON(!pmsu_mp_base);
> +		of_node_put(np);
> +
> +		/*
> +		 * This temporaty hack will be removed as soon as we

nit. s/temporaty/temporary/

thx,

Jason.

> +		 * get the proper reset controler support
> +		 */
> +		np = of_find_compatible_node(NULL, NULL, "marvell,armada-xp-cpu-reset");
> +		pmsu_reset_base = of_iomap(np, 0);
> +		WARN_ON(!pmsu_reset_base);
>  		of_node_put(np);
>  	}
>  
> -- 
> 1.8.1.2
> 
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