From: pankaj.dubey@samsung•com (pankaj.dubey)
To: linux-arm-kernel@lists•infradead.org
Subject: [3/4] ARM: EXYNOS: Remove static mapping of SCU SFR
Date: Mon, 07 Nov 2016 08:05:42 +0530 [thread overview]
Message-ID: <581FE87E.2040607@samsung.com> (raw)
In-Reply-To: <581C8C8F.5080100@samsung.com>
Hi Alim,
On Friday 04 November 2016 06:56 PM, Alim Akhtar wrote:
> Hi Pankaj,
>
> On 11/04/2016 09:09 AM, 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 <pankaj.dubey@samsung•com>
>> ---
>> 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");
>
> what if of_find_compatible_node() fails? May be add a error check for
> the same?
Thanks for review.
You are right of_find_compatible_node() is bound to fail, but only in
case supplied compatible is missing in DT. In our case this piece of
code will execute only for Cortex-A9 based SoC (which in case of Exynos
SoC is applicable only for Exynos4 series) and we will for sure
providing "arm,cortex-a9-scu" in DT, so there is no chance of failure.
So I feel extra check on "np" for NULL will add no benefit here.
Thanks,
Pankaj Dubey
next prev parent reply other threads:[~2016-11-07 2:35 UTC|newest]
Thread overview: 20+ messages / expand[flat|nested] mbox.gz Atom feed top
[not found] <CGME20161104033644epcas1p46d49c63576294d645c7fc131374bb49b@epcas1p4.samsung.com>
2016-11-04 3:39 ` [PATCH 0/4] Add SCU device node support for Exynos4 Pankaj Dubey
2016-11-04 3:39 ` [PATCH 1/4] ARM: EXYNOS: Remove smp_init_cpus hook from platsmp.c Pankaj Dubey
2016-11-04 12:53 ` [1/4] " Alim Akhtar
2016-11-05 15:41 ` [PATCH 1/4] " Krzysztof Kozlowski
2016-11-07 3:37 ` pankaj.dubey
2016-11-07 6:59 ` Krzysztof Kozlowski
2016-11-07 17:10 ` Pankaj Dubey
2016-11-04 3:39 ` [PATCH 2/4] ARM: dts: exynos: Add SCU device node to exynos4.dtsi Pankaj Dubey
2016-11-04 13:13 ` [2/4] " Alim Akhtar
2016-11-05 15:41 ` [PATCH 2/4] " Krzysztof Kozlowski
2016-11-04 3:39 ` [PATCH 3/4] ARM: EXYNOS: Remove static mapping of SCU SFR Pankaj Dubey
2016-11-04 13:26 ` [3/4] " Alim Akhtar
2016-11-07 2:35 ` pankaj.dubey [this message]
2016-11-07 4:49 ` Alim Akhtar
2016-11-07 16:59 ` Pankaj Dubey
2016-11-07 17:53 ` [PATCH 3/4] " Krzysztof Kozlowski
2016-11-08 3:14 ` pankaj.dubey
2016-11-04 3:39 ` [PATCH 4/4] ARM: EXYNOS: Remove unused soc_is_exynos{4,5} Pankaj Dubey
2016-11-04 13:31 ` [4/4] " Alim Akhtar
2016-11-04 7:33 ` [PATCH 0/4] Add SCU device node support for Exynos4 Marek Szyprowski
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