On 04/02/2014 08:48 PM, Sylwester Nawrocki wrote:
On 02/04/14 09:50, Pankaj Dubey wrote:
From: Young-Gun Jang <yg1004.jang@xxxxxxxxxxx>
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@xxxxxxxxxxx>
Signed-off-by: Pankaj Dubey <pankaj.dubey@xxxxxxxxxxx>
---
arch/arm/mach-exynos/common.h | 2 ++
arch/arm/mach-exynos/exynos.c | 44 +++++++++++++++++++++++++++++++++++++++++
2 files changed, 46 insertions(+)
[...]
#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;
+
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);
Are you sure...you need this in addition to ioremap() below ?
Can't you just use the Linux syscon API ?
There were some patches posted for syscon to make it available in earlier
system initialization stage: https://lkml.org/lkml/2014/2/19/218
Thanks for review and suggestion.
We need ioremap() in addition to iotable_init to get virtual address,
which will be used by other files also for read/write PMU registers.
Regarding syscon early initialization, since I was not aware of any such
patch earlier I have not used it. But after you suggested I tried it and
modified this implementation to use syscon API and regmap API and it's
working fine.
I will wait for review of other patches in this series and status of above
mentioned syscon API based on that I will update this in next revision.
+ exynos_pmu_base = ioremap(phys_addr, be32_to_cpu(reg[1]));
+ if (WARN_ON(!exynos_pmu_base))
+ return -EFAULT;
+ }
+
+ return 0;
+}
--
Thanks,
Sylwester
--
Best Regards,
Pankaj Dubey
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