linux-kernel - Re: [PATCH 01/02] mach-shmobile: Emma Mobile EV2 SoC base support

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Date:	Fri, 4 May 2012 13:07:45 +0000
From:	Arnd Bergmann <arnd@...db.de>
To:	Magnus Damm <magnus.damm@...il.com>
Cc:	linux-arm-kernel@...ts.infradead.org, linux@....linux.org.uk,
	linux-sh@...r.kernel.org, lethal@...ux-sh.org,
	linux-kernel@...r.kernel.org, rjw@...k.pl, horms@...ge.net.au,
	olof@...om.net
Subject: Re: [PATCH 01/02] mach-shmobile: Emma Mobile EV2 SoC base support

On Thursday 03 May 2012, Magnus Damm wrote:

> +
> +/* EMEV2 SMU registers */
> +#define USIAU0_RSTCTRL 0xe0110094
> +#define USIBU1_RSTCTRL 0xe01100ac
> +#define USIBU2_RSTCTRL 0xe01100b0
> +#define USIBU3_RSTCTRL 0xe01100b4
> +#define STI_RSTCTRL 0xe0110124
> +#define USIAU0GCLKCTRL 0xe01104a0
> +#define USIBU1GCLKCTRL 0xe01104b8
> +#define USIBU2GCLKCTRL 0xe01104bc
> +#define USIBU3GCLKCTRL 0xe01104c0
> +#define STIGCLKCTRL 0xe0110528
> +#define USIAU0SCLKDIV 0xe011061c
> +#define USIB2SCLKDIV 0xe011065c
> +#define USIB3SCLKDIV 0xe0110660
> +#define STI_CLKSEL 0xe0110688

Please cast to __iomem* here, e.g. using the IOMEM() macro, as these are
virtual addresses.

> +void __init emev2_clock_init(void)
> +{
> +	int k, ret = 0;
> +
> +	/* setup STI timer to run on 37.768 kHz and deassert reset */
> +	__raw_writel(0, STI_CLKSEL);
> +	__raw_writel(1, STI_RSTCTRL);
> +
> +	/* deassert reset for UART0->UART3 */
> +	__raw_writel(2, USIAU0_RSTCTRL);
> +	__raw_writel(2, USIBU1_RSTCTRL);
> +	__raw_writel(2, USIBU2_RSTCTRL);
> +	__raw_writel(2, USIBU3_RSTCTRL);

Better use iowrite32 or writel or writel_relaxed here, but not __raw_*.

> --- 0003/arch/arm/mach-shmobile/include/mach/common.h
> +++ work/arch/arm/mach-shmobile/include/mach/common.h	2012-05-03 20:45:56.000000000 +0900
> @@ -85,4 +85,10 @@ extern void r8a7779_secondary_init(unsig
>  extern int r8a7779_boot_secondary(unsigned int cpu);
>  extern void r8a7779_smp_prepare_cpus(void);
>  
> +extern void emev2_init_irq(void);
> +extern void emev2_map_io(void);
> +extern void emev2_add_early_devices(void);
> +extern void emev2_add_standard_devices(void);
> +extern void emev2_clock_init(void);
> +
>  #endif /* __ARCH_MACH_COMMON_H */

I would feel more comfortable with a separate header for this than putting
it into the same file as everything else, but it's not important to me.

> --- /dev/null
> +++ work/arch/arm/mach-shmobile/intc-emev2.c	2012-05-03 20:45:57.000000000 +0900

> +
> +void __init emev2_init_irq(void)
> +{
> +	void __iomem *gic_dist_base = IOMEM(0xe0028000);
> +	void __iomem *gic_cpu_base = IOMEM(0xe0020000);
> +
> +	/* use GIC to handle interrupts */
> +	gic_init(0, 29, gic_dist_base, gic_cpu_base);
> +}

This could just go into teh setup-emev2.c file, it doesn't actually do much,
and the other file is where the constants are coming from anyway. Then you
can put it right next to this code:

> +static struct map_desc emev2_io_desc[] __initdata = {
> +	/* 128K entity map for 0xe0020000 (GIC) */
> +	{
> +		.virtual	= 0xe0020000,
> +		.pfn		= __phys_to_pfn(0xe0020000),
> +		.length		= SZ_128K,
> +		.type		= MT_UNCACHED
> +	},
> +	/* 128K entity map for 0xe0100000 (SMU) */
> +	{
> +		.virtual	= 0xe0100000,
> +		.pfn		= __phys_to_pfn(0xe0100000),
> +		.length		= SZ_128K,
> +		.type		= MT_DEVICE
> +	},
> +};
> +
> +void __init emev2_map_io(void)
> +{
> +	iotable_init(emev2_io_desc, ARRAY_SIZE(emev2_io_desc));
> +}


	Arnd
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