linux-kernel - Re: [PATCH v4 4/6] ARM: zynq: Extend SLCR driver to read OCM configuration

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Message-ID: <f384b384e767499cafe62fed371f7ddd@BN1AFFO11FD052.protection.gbl>
Date:	Fri, 14 Nov 2014 07:15:33 -0800
From:	Sören Brinkmann <soren.brinkmann@...inx.com>
To:	Michal Simek <michal.simek@...inx.com>
CC:	<linux-arm-kernel@...ts.infradead.org>,
	Olof Johansson <olof@...om.net>, Arnd Bergmann <arnd@...db.de>,
	<monstr@...str.eu>, Josh Cartwright <josh.cartwright@...com>,
	Steffen Trumtrar <s.trumtrar@...gutronix.de>,
	Rob Herring <robherring2@...il.com>,
	Peter Crosthwaite <peter.crosthwaite@...inx.com>,
	Russell King <linux@....linux.org.uk>,
	<linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v4 4/6] ARM: zynq: Extend SLCR driver to read OCM
 configuration

On Fri, 2014-11-14 at 11:52AM +0100, Michal Simek wrote:
> Get OCM configuration from SLCR.
> 
> Signed-off-by: Michal Simek <michal.simek@...inx.com>
> ---
> 
> Changes in v4:
> - slcr.h has moved to soc/include/ folder. Move definition there too.
> 
> Changes in v3: None
> Changes in v2: None
> 
>  arch/arm/mach-zynq/slcr.c | 15 +++++++++++++++
>  include/soc/zynq/slcr.h   |  1 +
>  2 files changed, 16 insertions(+)
> 
> diff --git a/arch/arm/mach-zynq/slcr.c b/arch/arm/mach-zynq/slcr.c
> index b77e42d999c8..f7c606e57525 100644
> --- a/arch/arm/mach-zynq/slcr.c
> +++ b/arch/arm/mach-zynq/slcr.c
> @@ -29,6 +29,7 @@
>  #define SLCR_A9_CPU_RST_CTRL_OFFSET	0x244 /* CPU Software Reset Control */
>  #define SLCR_REBOOT_STATUS_OFFSET	0x258 /* PS Reboot Status */
>  #define SLCR_PSS_IDCODE			0x530 /* PS IDCODE */
> +#define SLCR_OCM_CFG_OFFSET		0x910 /* OCM Address Mapping */
> 
>  #define SLCR_UNLOCK_MAGIC		0xDF0D
>  #define SLCR_A9_CPU_CLKSTOP		0x10
> @@ -128,6 +129,20 @@ void zynq_slcr_system_reset(void)
>  }
> 
>  /**
> + * zynq_slcr_get_ocm_config - Get SLCR OCM config
> + *
> + * Return:	OCM config bits
> + */
> +u32 zynq_slcr_get_ocm_config(void)
> +{
> +	u32 val;
> +
> +	zynq_slcr_read(&val, SLCR_OCM_CFG_OFFSET);
> +
> +	return val;
> +}
> +
> +/**
>   * zynq_slcr_cpu_start - Start cpu
>   * @cpu:	cpu number
>   */
> diff --git a/include/soc/zynq/slcr.h b/include/soc/zynq/slcr.h
> index 7b4edab666ee..639723c4f90c 100644
> --- a/include/soc/zynq/slcr.h
> +++ b/include/soc/zynq/slcr.h
> @@ -25,5 +25,6 @@ extern void zynq_slcr_cpu_start(int cpu);
>  extern bool zynq_slcr_cpu_state_read(int cpu);
>  extern void zynq_slcr_cpu_state_write(int cpu, bool die);
>  extern u32 zynq_slcr_get_device_id(void);
> +extern u32 zynq_slcr_get_ocm_config(void);

I still believe we should consolidate this somehow instead of adding
another function for each and every register that might have to be read
by something else.

Usage of syscon/regmap might be an option. Or probably something like:
enum zynq_slcr_reg {
	zynq_slcr_ocm_cfg,
	zynq_slcr_device_id,
	...
};
u32 zyn_slcr_read(enum zynq_slcr_reg id)
{
	switch (id) {
	case ...
}

	Sören
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