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ARM: EXYNOS: Create virtual I/O mapping for Chip-ID controller using device tree

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On device tree enabled exynos platforms, retrieve the physical base address
of the chip-id controller from device tree and create a virtual I/O mapping
for the chip-id controller. This helps to remove the chip-id controller entry
from the statically defined I/O mapping tables.

Signed-off-by: Thomas Abraham <thomas.abraham@linaro.org>
Signed-off-by: Kukjin Kim <kgene.kim@samsung.com>
This commit is contained in:
Thomas Abraham 2013-04-23 22:46:53 +09:00 committed by Kukjin Kim
parent 58a7bbf754
commit f5f83c71ff
2 changed files with 30 additions and 24 deletions
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53
arch/arm/mach-exynos/common.c
View File

@ -119,17 +119,6 @@ static struct map_desc exynos_iodesc[] __initdata = {
},
};
#ifdef CONFIG_ARCH_EXYNOS5
static struct map_desc exynos5440_iodesc[] __initdata = {
{
.virtual = (unsigned long)S5P_VA_CHIPID,
.pfn = __phys_to_pfn(EXYNOS5440_PA_CHIPID),
.length = SZ_4K,
.type = MT_DEVICE,
},
};
#endif
static struct map_desc exynos4_iodesc[] __initdata = {
{
.virtual = (unsigned long)S3C_VA_SYS,
@ -320,6 +309,31 @@ void __init exynos_init_late(void)
exynos_pm_late_initcall();
}
#ifdef CONFIG_OF
int __init exynos_fdt_map_chipid(unsigned long node, const char *uname,
int depth, void *data)
{
struct map_desc iodesc;
__be32 *reg;
unsigned long len;
if (!of_flat_dt_is_compatible(node, "samsung,exynos4210-chipid") &&
!of_flat_dt_is_compatible(node, "samsung,exynos5440-clock"))
return 0;
reg = of_get_flat_dt_prop(node, "reg", &len);
if (reg == NULL || len != (sizeof(unsigned long) * 2))
return 0;
iodesc.pfn = __phys_to_pfn(be32_to_cpu(reg[0]));
iodesc.length = be32_to_cpu(reg[1]) - 1;
iodesc.virtual = (unsigned long)S5P_VA_CHIPID;
iodesc.type = MT_DEVICE;
iotable_init(&iodesc, 1);
return 1;
}
#endif
/*
* exynos_map_io
*
@ -328,19 +342,12 @@ void __init exynos_init_late(void)
void __init exynos_init_io(struct map_desc *mach_desc, int size)
{
struct map_desc *iodesc = exynos_iodesc;
int iodesc_sz = ARRAY_SIZE(exynos_iodesc);
#if defined(CONFIG_OF) && defined(CONFIG_ARCH_EXYNOS5)
unsigned long root = of_get_flat_dt_root();
/* initialize the io descriptors we need for initialization */
if (of_flat_dt_is_compatible(root, "samsung,exynos5440")) {
iodesc = exynos5440_iodesc;
iodesc_sz = ARRAY_SIZE(exynos5440_iodesc);
}
#ifdef CONFIG_OF
if (initial_boot_params)
of_scan_flat_dt(exynos_fdt_map_chipid, NULL);
else
#endif
iotable_init(iodesc, iodesc_sz);
iotable_init(exynos_iodesc, ARRAY_SIZE(exynos_iodesc));
if (mach_desc)
iotable_init(mach_desc, size);

1
arch/arm/mach-exynos/include/mach/map.h
View File

@ -53,7 +53,6 @@
#define EXYNOS4_PA_ONENAND_DMA 0x0C600000
#define EXYNOS_PA_CHIPID 0x10000000
#define EXYNOS5440_PA_CHIPID 0x00160000
#define EXYNOS4_PA_SYSCON 0x10010000
#define EXYNOS5_PA_SYSCON 0x10050100