From c06af3cc6a27991187fd513765fed943684d41bf Mon Sep 17 00:00:00 2001 From: Kukjin Kim Date: Sat, 20 Aug 2011 02:18:18 +0900 Subject: ARM: SAMSUNG: Add support for detecting CPU at runtime The soc_is_[name]() can be used to distinguish cpu at runtime. This patch was originally from Changhwan Youn Acked-by: Changhwan Youn Cc: Ben Dooks Signed-off-by: Kukjin Kim --- arch/arm/plat-s5p/cpu.c | 26 ++++++++++++-------------- 1 file changed, 12 insertions(+), 14 deletions(-) (limited to 'arch/arm/plat-s5p') diff --git a/arch/arm/plat-s5p/cpu.c b/arch/arm/plat-s5p/cpu.c index bbc2aa7449ca..3ef673482111 100644 --- a/arch/arm/plat-s5p/cpu.c +++ b/arch/arm/plat-s5p/cpu.c @@ -36,40 +36,40 @@ static const char name_exynos4210[] = "EXYNOS4210"; static struct cpu_table cpu_ids[] __initdata = { { - .idcode = 0x56440100, - .idmask = 0xfffff000, + .idcode = S5P6440_CPU_ID, + .idmask = S5P64XX_CPU_MASK, .map_io = s5p6440_map_io, .init_clocks = s5p6440_init_clocks, .init_uarts = s5p6440_init_uarts, .init = s5p64x0_init, .name = name_s5p6440, }, { - .idcode = 0x36450000, - .idmask = 0xfffff000, + .idcode = S5P6450_CPU_ID, + .idmask = S5P64XX_CPU_MASK, .map_io = s5p6450_map_io, .init_clocks = s5p6450_init_clocks, .init_uarts = s5p6450_init_uarts, .init = s5p64x0_init, .name = name_s5p6450, }, { - .idcode = 0x43100000, - .idmask = 0xfffff000, + .idcode = S5PC100_CPU_ID, + .idmask = S5PC100_CPU_MASK, .map_io = s5pc100_map_io, .init_clocks = s5pc100_init_clocks, .init_uarts = s5pc100_init_uarts, .init = s5pc100_init, .name = name_s5pc100, }, { - .idcode = 0x43110000, - .idmask = 0xfffff000, + .idcode = S5PV210_CPU_ID, + .idmask = S5PV210_CPU_MASK, .map_io = s5pv210_map_io, .init_clocks = s5pv210_init_clocks, .init_uarts = s5pv210_init_uarts, .init = s5pv210_init, .name = name_s5pv210, }, { - .idcode = 0x43210000, - .idmask = 0xfffe0000, + .idcode = EXYNOS4210_CPU_ID, + .idmask = EXYNOS4_CPU_MASK, .map_io = exynos4_map_io, .init_clocks = exynos4_init_clocks, .init_uarts = exynos4_init_uarts, @@ -114,13 +114,11 @@ static struct map_desc s5p_iodesc[] __initdata = { void __init s5p_init_io(struct map_desc *mach_desc, int size, void __iomem *cpuid_addr) { - unsigned long idcode; - /* initialize the io descriptors we need for initialization */ iotable_init(s5p_iodesc, ARRAY_SIZE(s5p_iodesc)); if (mach_desc) iotable_init(mach_desc, size); - idcode = __raw_readl(cpuid_addr); - s3c_init_cpu(idcode, cpu_ids, ARRAY_SIZE(cpu_ids)); + samsung_cpu_id = __raw_readl(cpuid_addr); + s3c_init_cpu(samsung_cpu_id, cpu_ids, ARRAY_SIZE(cpu_ids)); } -- cgit 1.4.1 From e6d1cb9f1fffd7e300af6d8f6731a486d6255e3f Mon Sep 17 00:00:00 2001 From: Kukjin Kim Date: Sat, 20 Aug 2011 12:18:07 +0900 Subject: ARM: SAMSUNG: Add support for handling of cpu revision This patch adds plat-samsung/cpu.c for detecting of cpu id and silicon revision. This patch was originally from Changhwan Youn Acked-by: Changhwan Youn Cc: Ben Dooks Signed-off-by: Kukjin Kim --- arch/arm/mach-s3c64xx/cpu.c | 10 ++---- arch/arm/plat-s3c24xx/cpu.c | 1 + arch/arm/plat-s5p/cpu.c | 4 ++- arch/arm/plat-samsung/Makefile | 2 +- arch/arm/plat-samsung/cpu.c | 58 ++++++++++++++++++++++++++++++++ arch/arm/plat-samsung/include/plat/cpu.h | 4 +++ arch/arm/plat-samsung/init.c | 1 - 7 files changed, 69 insertions(+), 11 deletions(-) create mode 100644 arch/arm/plat-samsung/cpu.c (limited to 'arch/arm/plat-s5p') diff --git a/arch/arm/mach-s3c64xx/cpu.c b/arch/arm/mach-s3c64xx/cpu.c index 7b665f3e2e1f..6c498f9a18c5 100644 --- a/arch/arm/mach-s3c64xx/cpu.c +++ b/arch/arm/mach-s3c64xx/cpu.c @@ -144,14 +144,8 @@ void __init s3c64xx_init_io(struct map_desc *mach_desc, int size) iotable_init(s3c_iodesc, ARRAY_SIZE(s3c_iodesc)); iotable_init(mach_desc, size); - samsung_cpu_id = __raw_readl(S3C_VA_SYS + 0x118); - if (!samsung_cpu_id) { - /* S3C6400 has the ID register in a different place, - * and needs a write before it can be read. */ - - __raw_writel(0x0, S3C_VA_SYS + 0xA1C); - samsung_cpu_id = __raw_readl(S3C_VA_SYS + 0xA1C); - } + /* detect cpu id */ + s3c64xx_init_cpu(); s3c_init_cpu(samsung_cpu_id, cpu_ids, ARRAY_SIZE(cpu_ids)); } diff --git a/arch/arm/plat-s3c24xx/cpu.c b/arch/arm/plat-s3c24xx/cpu.c index ead21a4a7f8a..3c6335307fb1 100644 --- a/arch/arm/plat-s3c24xx/cpu.c +++ b/arch/arm/plat-s3c24xx/cpu.c @@ -224,6 +224,7 @@ void __init s3c24xx_init_io(struct map_desc *mach_desc, int size) } else { samsung_cpu_id = s3c24xx_read_idcode_v4(); } + s3c24xx_init_cpu(); arm_pm_restart = s3c24xx_pm_restart; diff --git a/arch/arm/plat-s5p/cpu.c b/arch/arm/plat-s5p/cpu.c index 3ef673482111..04392c70d055 100644 --- a/arch/arm/plat-s5p/cpu.c +++ b/arch/arm/plat-s5p/cpu.c @@ -119,6 +119,8 @@ void __init s5p_init_io(struct map_desc *mach_desc, if (mach_desc) iotable_init(mach_desc, size); - samsung_cpu_id = __raw_readl(cpuid_addr); + /* detect cpu id and rev. */ + s5p_init_cpu(cpuid_addr); + s3c_init_cpu(samsung_cpu_id, cpu_ids, ARRAY_SIZE(cpu_ids)); } diff --git a/arch/arm/plat-samsung/Makefile b/arch/arm/plat-samsung/Makefile index 853764ba8cc5..3de756da5eaa 100644 --- a/arch/arm/plat-samsung/Makefile +++ b/arch/arm/plat-samsung/Makefile @@ -11,7 +11,7 @@ obj- := # Objects we always build independent of SoC choice -obj-y += init.o +obj-y += init.o cpu.o obj-$(CONFIG_ARCH_USES_GETTIMEOFFSET) += time.o obj-y += clock.o obj-y += pwm-clock.o diff --git a/arch/arm/plat-samsung/cpu.c b/arch/arm/plat-samsung/cpu.c new file mode 100644 index 000000000000..81c06d44c11e --- /dev/null +++ b/arch/arm/plat-samsung/cpu.c @@ -0,0 +1,58 @@ +/* linux/arch/arm/plat-samsung/cpu.c + * + * Copyright (c) 2009-2011 Samsung Electronics Co., Ltd. + * http://www.samsung.com + * + * Samsung CPU Support + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License version 2 as + * published by the Free Software Foundation. +*/ + +#include +#include +#include +#include + +#include + +#include +#include + +unsigned long samsung_cpu_id; +static unsigned int samsung_cpu_rev; + +unsigned int samsung_rev(void) +{ + return samsung_cpu_rev; +} +EXPORT_SYMBOL(samsung_rev); + +void __init s3c24xx_init_cpu(void) +{ + /* nothing here yet */ + + samsung_cpu_rev = 0; +} + +void __init s3c64xx_init_cpu(void) +{ + samsung_cpu_id = __raw_readl(S3C_VA_SYS + 0x118); + if (!samsung_cpu_id) { + /* + * S3C6400 has the ID register in a different place, + * and needs a write before it can be read. + */ + __raw_writel(0x0, S3C_VA_SYS + 0xA1C); + samsung_cpu_id = __raw_readl(S3C_VA_SYS + 0xA1C); + } + + samsung_cpu_rev = 0; +} + +void __init s5p_init_cpu(void __iomem *cpuid_addr) +{ + samsung_cpu_id = __raw_readl(cpuid_addr); + samsung_cpu_rev = samsung_cpu_id & 0xFF; +} diff --git a/arch/arm/plat-samsung/include/plat/cpu.h b/arch/arm/plat-samsung/include/plat/cpu.h index bdf43ad3b5ec..c22d110a1965 100644 --- a/arch/arm/plat-samsung/include/plat/cpu.h +++ b/arch/arm/plat-samsung/include/plat/cpu.h @@ -140,6 +140,10 @@ extern void s3c64xx_init_io(struct map_desc *mach_desc, int size); extern void s5p_init_io(struct map_desc *mach_desc, int size, void __iomem *cpuid_addr); +extern void s3c24xx_init_cpu(void); +extern void s3c64xx_init_cpu(void); +extern void s5p_init_cpu(void __iomem *cpuid_addr); + extern void s3c24xx_init_uarts(struct s3c2410_uartcfg *cfg, int no); extern void s3c24xx_init_clocks(int xtal); diff --git a/arch/arm/plat-samsung/init.c b/arch/arm/plat-samsung/init.c index 40b1228adb88..79d10fca9090 100644 --- a/arch/arm/plat-samsung/init.c +++ b/arch/arm/plat-samsung/init.c @@ -30,7 +30,6 @@ #include static struct cpu_table *cpu; -unsigned long samsung_cpu_id; static struct cpu_table * __init s3c_lookup_cpu(unsigned long idcode, struct cpu_table *tab, -- cgit 1.4.1