Subject: [PATCH 3/4] ARM: EXYNOS: Remove static mapping of SCU SFR

From: [email-masked] (pankaj.dubey)
Date: Tue, 08 Nov 2016 08:44:18 +0530

Hi Krzysztof,

On Monday 07 November 2016 11:23 PM, Krzysztof Kozlowski wrote:
> On Fri, Nov 04, 2016 at 09:09:23AM +0530, Pankaj Dubey wrote:
>> Lets remove static mapping of SCU SFR mainly used in CORTEX-A9 SoC based boards.
>> Instead use mapping from device tree node of SCU.
>>
>> Signed-off-by: Pankaj Dubey <[email-masked]>
>> ---
>>  arch/arm/mach-exynos/exynos.c                | 22 ----------------------
>>  arch/arm/mach-exynos/include/mach/map.h      |  2 --
>>  arch/arm/mach-exynos/platsmp.c               | 18 +++++++++++-------
>>  arch/arm/mach-exynos/pm.c                    | 14 +++++++++++---
>>  arch/arm/mach-exynos/suspend.c               | 15 +++++++++++----
>>  arch/arm/plat-samsung/include/plat/map-s5p.h |  4 ----
>>  6 files changed, 33 insertions(+), 42 deletions(-)
>>
>> diff --git a/arch/arm/mach-exynos/exynos.c b/arch/arm/mach-exynos/exynos.c
>> index 757fc11..fa08ef9 100644
>> --- a/arch/arm/mach-exynos/exynos.c
>> +++ b/arch/arm/mach-exynos/exynos.c
>> @@ -28,15 +28,6 @@
>>  
>>  #include "common.h"
>>  
>> -static struct map_desc exynos4_iodesc[] __initdata = {
>> -	{
>> -		.virtual	= (unsigned long)S5P_VA_COREPERI_BASE,
>> -		.pfn		= __phys_to_pfn(EXYNOS4_PA_COREPERI),
>> -		.length		= SZ_8K,
>> -		.type		= MT_DEVICE,
>> -	},
>> -};
>> -
>>  static struct platform_device exynos_cpuidle = {
>>  	.name              = "exynos_cpuidle",
>>  #ifdef CONFIG_ARM_EXYNOS_CPUIDLE
>> @@ -99,17 +90,6 @@ static int __init exynos_fdt_map_chipid(unsigned long node, const char *uname,
>>  	return 1;
>>  }
>>  
>> -/*
>> - * exynos_map_io
>> - *
>> - * register the standard cpu IO areas
>> - */
>> -static void __init exynos_map_io(void)
>> -{
>> -	if (soc_is_exynos4())
>> -		iotable_init(exynos4_iodesc, ARRAY_SIZE(exynos4_iodesc));
>> -}
>> -
>>  static void __init exynos_init_io(void)
>>  {
>>  	debug_ll_io_init();
>> @@ -118,8 +98,6 @@ static void __init exynos_init_io(void)
>>  
>>  	/* detect cpu id and rev. */
>>  	s5p_init_cpu(S5P_VA_CHIPID);
>> -
>> -	exynos_map_io();
>>  }
>>  
>>  /*
>> diff --git a/arch/arm/mach-exynos/include/mach/map.h b/arch/arm/mach-exynos/include/mach/map.h
>> index 5fb0040..0eef407 100644
>> --- a/arch/arm/mach-exynos/include/mach/map.h
>> +++ b/arch/arm/mach-exynos/include/mach/map.h
>> @@ -18,6 +18,4 @@
>>  
>>  #define EXYNOS_PA_CHIPID		0x10000000
>>  
>> -#define EXYNOS4_PA_COREPERI		0x10500000
>> -
>>  #endif /* __ASM_ARCH_MAP_H */
>> diff --git a/arch/arm/mach-exynos/platsmp.c b/arch/arm/mach-exynos/platsmp.c
>> index a5d6841..553d0d9 100644
>> --- a/arch/arm/mach-exynos/platsmp.c
>> +++ b/arch/arm/mach-exynos/platsmp.c
>> @@ -224,11 +224,6 @@ static void write_pen_release(int val)
>>  	sync_cache_w(&pen_release);
>>  }
>>  
>> -static void __iomem *scu_base_addr(void)
>> -{
>> -	return (void __iomem *)(S5P_VA_SCU);
>> -}
>> -
>>  static DEFINE_SPINLOCK(boot_lock);
>>  
>>  static void exynos_secondary_init(unsigned int cpu)
>> @@ -387,14 +382,23 @@ fail:
>>  
>>  static void __init exynos_smp_prepare_cpus(unsigned int max_cpus)
>>  {
>> +	struct device_node *np;
>> +	void __iomem *scu_base;
>>  	int i;
>>  
>>  	exynos_sysram_init();
>>  
>>  	exynos_set_delayed_reset_assertion(true);
>>  
>> -	if (read_cpuid_part() == ARM_CPU_PART_CORTEX_A9)
>> -		scu_enable(scu_base_addr());
>> +	if (read_cpuid_part() == ARM_CPU_PART_CORTEX_A9) {
>> +		np = of_find_compatible_node(NULL, NULL, "arm,cortex-a9-scu");
>> +		scu_base = of_iomap(np, 0);
>> +		if (scu_base) {
>> +			scu_enable(scu_base);
>> +			iounmap(scu_base);
>> +		}
>> +		of_node_put(np);
> 
> I do not like the duplication - this code appears in three places and
> they are the same. Could you split it into separate function?
> 
OK, will do these changes in v2.

Only pm.c and suspend.c file's scu_enable can be moved to single place
without introducing more dependencies between these mach files.

> As you mentioned to Alim, in case of lack of node, it would be nice to notify the
> user (pr_err() etc).
> 
OK, will do these changes in v2.

Thanks,
Pankaj Dubey

> Best regards,
> Krzysztof