linux-kernel - Re: [PATCH 06/10] ARM: EXYNOS: Add support for mapping PMU base address via DT

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Message-id: <53587ADA.1090003@samsung.com>
Date:	Thu, 24 Apr 2014 11:45:46 +0900
From:	Pankaj Dubey <pankaj.dubey@...sung.com>
To:	Vikas Sajjan <sajjan.linux@...il.com>
Cc:	"linux-arm-kernel@...ts.infradead.org" 
	<linux-arm-kernel@...ts.infradead.org>,
	linux-kernel@...r.kernel.org,
	linux-samsung-soc <linux-samsung-soc@...r.kernel.org>,
	Kukjin Kim <kgene.kim@...sung.com>, linux@....linux.org.uk,
	chow.kim@...sung.com, Young-Gun Jang <yg1004.jang@...sung.com>,
	sunil joshi <joshi@...sung.com>,
	Tomasz Figa <tomasz.figa@...il.com>
Subject: Re: [PATCH 06/10] ARM: EXYNOS: Add support for mapping PMU base
 address via DT

Hi Vikas,

On 04/23/2014 10:02 PM, Vikas Sajjan wrote:
> Hi,
>
> On Wed, Apr 2, 2014 at 1:20 PM, Pankaj Dubey <pankaj.dubey@...sung.com> wrote:
>> From: Young-Gun Jang <yg1004.jang@...sung.com>
>>
>> Add support for mapping Exynos Power Management Unit (PMU) base address
>> from device tree. Code will use existing samsung pmu binding information.
>> This patch also adds "get_exynos_pmubase" a helper function to return mapped base
>> address to various other files under "mach-exynos".
>>
>> Signed-off-by: Young-Gun Jang <yg1004.jang@...sung.com>
>> Signed-off-by: Pankaj Dubey <pankaj.dubey@...sung.com>
>> ---
>>   arch/arm/mach-exynos/common.h |    2 ++
>>   arch/arm/mach-exynos/exynos.c |   44 +++++++++++++++++++++++++++++++++++++++++
>>   2 files changed, 46 insertions(+)
>>
>> diff --git a/arch/arm/mach-exynos/common.h b/arch/arm/mach-exynos/common.h
>> index ff28334..9a55cf6 100644
>> --- a/arch/arm/mach-exynos/common.h
>> +++ b/arch/arm/mach-exynos/common.h
>> @@ -61,4 +61,6 @@ struct exynos_pmu_conf {
>>
>>   extern void exynos_sys_powerdown_conf(enum sys_powerdown mode);
>>
>> +extern void __iomem *get_exynos_pmubase(void);
>> +
>>   #endif /* __ARCH_ARM_MACH_EXYNOS_COMMON_H */
>> diff --git a/arch/arm/mach-exynos/exynos.c b/arch/arm/mach-exynos/exynos.c
>> index a5e1349..a5127fb 100644
>> --- a/arch/arm/mach-exynos/exynos.c
>> +++ b/arch/arm/mach-exynos/exynos.c
>> @@ -35,6 +35,8 @@
>>   #define L2_AUX_VAL 0x7C470001
>>   #define L2_AUX_MASK 0xC200ffff
>>
>> +static void __iomem *exynos_pmu_base __initdata;
> Are you sure you want to keep exynos_pmu_base in .init section.
> I am seeing a crash in platform_do_lowpower()
> I think you should remove __initdata.

Thanks for review and testing.
You are right we do not need __initdata here.
I will take care of this in V2.

>> +
>>   static struct map_desc exynos4_iodesc[] __initdata = {
>>          {
>>                  .virtual        = (unsigned long)S3C_VA_SYS,
>> @@ -245,6 +247,47 @@ void __init exynos_init_late(void)
>>          exynos_pm_init();
>>   }
>>
>> +static char const *exynos_dt_pmu_match[] __initconst = {
>> +       "samsung,exynos4210-pmu",
>> +       "samsung,exynos4212-pmu",
>> +       "samsung,exynos4412-pmu",
>> +       "samsung,exynos5250-pmu",
>> +       NULL
>> +};
>> +
>> +static int __init exynos_fdt_map_pmu(unsigned long node,
>> +               const char *uname, int depth, void *data)
>> +{
>> +       struct map_desc iodesc;
>> +       __be32 *reg;
>> +       unsigned long len;
>> +
>> +       if (of_flat_dt_match(node, exynos_dt_pmu_match)) {
>> +               phys_addr_t phys_addr;
>> +               reg = of_get_flat_dt_prop(node, "reg", &len);
>> +               if (reg == NULL || len != (sizeof(unsigned long) * 2))
>> +                       return 0;
>> +
>> +               phys_addr = be32_to_cpu(reg[0]);
>> +               iodesc.pfn = __phys_to_pfn(phys_addr);
>> +               iodesc.length = be32_to_cpu(reg[1]) - 1;
>> +               iodesc.virtual = (unsigned long)S5P_VA_PMU;
>> +               iodesc.type = MT_DEVICE;
>> +               iotable_init(&iodesc, 1);
>> +
>> +               exynos_pmu_base = ioremap(phys_addr, be32_to_cpu(reg[1]));
>> +               if (WARN_ON(!exynos_pmu_base))
>> +                       return -EFAULT;
>> +       }
>> +
>> +       return 0;
>> +}
>> +
>> +inline void __iomem *get_exynos_pmubase()
>> +{
>> +       return exynos_pmu_base;
>> +}
>> +
>>   static int __init exynos_fdt_map_chipid(unsigned long node, const char *uname,
>>                                          int depth, void *data)
>>   {
>> @@ -301,6 +344,7 @@ void __init exynos_init_io(void)
>>          debug_ll_io_init();
>>
>>          of_scan_flat_dt(exynos_fdt_map_chipid, NULL);
>> +       of_scan_flat_dt(exynos_fdt_map_pmu, NULL);
>>
>>          /* detect cpu id and rev. */
>>          s5p_init_cpu(S5P_VA_CHIPID);
>> --
>> 1.7.10.4
>>
>> --
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-- 
Best Regards,
Pankaj Dubey

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