Re: [PATCH 07/36] ARM: exynos: use private samsung_cpu_id copy

Krzysztof Kozlowski
2019-10-23T10:54:52Z

On Thu, Oct 10, 2019 at 10:29:51PM +0200, Arnd Bergmann wrote:
> The only part of plat-samsung that is shared with arch-exynos
> is the CPU identification code.
>
> Having a separate exynos_cpu_id variable makes the two completely
> independent and is actually a bit less code in total.
>
> Signed-off-by: Arnd Bergmann <arnd@arndb.de>
> ---
> arch/arm/mach-exynos/common.h | 6 +++---
> arch/arm/mach-exynos/exynos.c | 19 +++++++++++++++----
> arch/arm/mach-exynos/include/mach/map.h | 18 ------------------
> arch/arm/mach-exynos/platsmp.c | 4 +---
> arch/arm/mach-exynos/pm.c | 8 ++++----
> arch/arm/plat-samsung/cpu.c | 17 -----------------
> arch/arm/plat-samsung/include/plat/cpu.h | 2 --
> arch/arm/plat-samsung/include/plat/map-s5p.h | 2 --
> 8 files changed, 23 insertions(+), 53 deletions(-)
> delete mode 100644 arch/arm/mach-exynos/include/mach/map.h
>
> diff --git a/arch/arm/mach-exynos/common.h b/arch/arm/mach-exynos/common.h
> index 56411bb63d45..adf7db9c0885 100644
> --- a/arch/arm/mach-exynos/common.h
> +++ b/arch/arm/mach-exynos/common.h
> @@ -24,12 +24,12 @@
> #define EXYNOS5800_SOC_ID 0xE5422000
> #define EXYNOS5_SOC_MASK 0xFFFFF000
>
> -extern unsigned long samsung_cpu_id;
> +extern unsigned long exynos_cpu_id;
>
> #define IS_SAMSUNG_CPU(name, id, mask) \
> static inline int is_samsung_##name(void) \
> { \
> - return ((samsung_cpu_id & mask) == (id & mask)); \
> + return ((exynos_cpu_id & mask) == (id & mask)); \
> }
>
> IS_SAMSUNG_CPU(exynos3250, EXYNOS3250_SOC_ID, EXYNOS3_SOC_MASK)
> @@ -147,7 +147,7 @@ extern struct cpuidle_exynos_data cpuidle_coupled_exynos_data;
>
> extern void exynos_set_delayed_reset_assertion(bool enable);
>
> -extern unsigned int samsung_rev(void);
> +extern unsigned int exynos_rev(void);
> extern void exynos_core_restart(u32 core_id);
> extern int exynos_set_boot_addr(u32 core_id, unsigned long boot_addr);
> extern int exynos_get_boot_addr(u32 core_id, unsigned long *boot_addr);
> diff --git a/arch/arm/mach-exynos/exynos.c b/arch/arm/mach-exynos/exynos.c
> index 9aa483366ebc..da9300d655c6 100644
> --- a/arch/arm/mach-exynos/exynos.c
> +++ b/arch/arm/mach-exynos/exynos.c
> @@ -19,11 +19,10 @@
> #include <asm/mach/arch.h>
> #include <asm/mach/map.h>
>
> -#include <mach/map.h>
> -#include <plat/cpu.h>
> -
> #include "common.h"
>
> +#define S5P_VA_CHIPID ((void __iomem __force *)0xF8000000)

How about keeping the S3C_VA and S3C_ADDR_BASE macros/defines and using
them? They still appear in arch/arm/include/debug/exynos.S so they could
be integrated into one header, unless you plan to remove it in further
patches.

> +
> static struct platform_device exynos_cpuidle = {
> .name = "exynos_cpuidle",
> #ifdef CONFIG_ARM_EXYNOS_CPUIDLE
> @@ -36,6 +35,14 @@ void __iomem *sysram_base_addr __ro_after_init;
> phys_addr_t sysram_base_phys __ro_after_init;
> void __iomem *sysram_ns_base_addr __ro_after_init;
>
> +unsigned long exynos_cpu_id;
> +static unsigned int exynos_cpu_rev;
> +
> +unsigned int exynos_rev(void)
> +{
> + return exynos_cpu_rev;
> +}
> +
> void __init exynos_sysram_init(void)
> {
> struct device_node *node;
> @@ -86,7 +93,11 @@ static void __init exynos_init_io(void)
> of_scan_flat_dt(exynos_fdt_map_chipid, NULL);
>
> /* detect cpu id and rev. */
> - s5p_init_cpu(S5P_VA_CHIPID);
> + exynos_cpu_id = readl_relaxed(S5P_VA_CHIPID);
> + exynos_cpu_rev = exynos_cpu_id & 0xFF;
> +
> + pr_info("Samsung CPU ID: 0x%08lx\n", exynos_cpu_id);
> +
> }
>
> /*
> diff --git a/arch/arm/mach-exynos/include/mach/map.h b/arch/arm/mach-exynos/include/mach/map.h
> deleted file mode 100644
> index 22ebe3654633..000000000000
> --- a/arch/arm/mach-exynos/include/mach/map.h
> +++ /dev/null
> @@ -1,18 +0,0 @@
> -/* SPDX-License-Identifier: GPL-2.0 */
> -/*
> - * Copyright (c) 2010-2011 Samsung Electronics Co., Ltd.
> - * http://www.samsung.com/
> - *
> - * EXYNOS - Memory map definitions
> - */
> -
> -#ifndef __ASM_ARCH_MAP_H
> -#define __ASM_ARCH_MAP_H __FILE__
> -
> -#include <plat/map-base.h>
> -
> -#include <plat/map-s5p.h>
> -
> -#define EXYNOS_PA_CHIPID 0x10000000
> -
> -#endif /* __ASM_ARCH_MAP_H */
> diff --git a/arch/arm/mach-exynos/platsmp.c b/arch/arm/mach-exynos/platsmp.c
> index 0cbbae8bf1f8..d7fedbb2eefe 100644
> --- a/arch/arm/mach-exynos/platsmp.c
> +++ b/arch/arm/mach-exynos/platsmp.c
> @@ -22,8 +22,6 @@
> #include <asm/smp_scu.h>
> #include <asm/firmware.h>
>
> -#include <mach/map.h>
> -
> #include "common.h"
>
> extern void exynos4_secondary_startup(void);
> @@ -188,7 +186,7 @@ void exynos_scu_enable(void)
>
> static void __iomem *cpu_boot_reg_base(void)
> {
> - if (soc_is_exynos4210() && samsung_rev() == EXYNOS4210_REV_1_1)
> + if (soc_is_exynos4210() && exynos_rev() == EXYNOS4210_REV_1_1)
> return pmu_base_addr + S5P_INFORM5;
> return sysram_base_addr;
> }
> diff --git a/arch/arm/mach-exynos/pm.c b/arch/arm/mach-exynos/pm.c
> index 48e7fb38613e..624585641a9c 100644
> --- a/arch/arm/mach-exynos/pm.c
> +++ b/arch/arm/mach-exynos/pm.c
> @@ -26,18 +26,18 @@
>
> static inline void __iomem *exynos_boot_vector_addr(void)
> {
> - if (samsung_rev() == EXYNOS4210_REV_1_1)
> + if (exynos_rev() == EXYNOS4210_REV_1_1)
> return pmu_base_addr + S5P_INFORM7;
> - else if (samsung_rev() == EXYNOS4210_REV_1_0)
> + else if (exynos_rev() == EXYNOS4210_REV_1_0)
> return sysram_base_addr + 0x24;
> return pmu_base_addr + S5P_INFORM0;
> }
>
> static inline void __iomem *exynos_boot_vector_flag(void)
> {
> - if (samsung_rev() == EXYNOS4210_REV_1_1)
> + if (exynos_rev() == EXYNOS4210_REV_1_1)
> return pmu_base_addr + S5P_INFORM6;
> - else if (samsung_rev() == EXYNOS4210_REV_1_0)
> + else if (exynos_rev() == EXYNOS4210_REV_1_0)
> return sysram_base_addr + 0x20;
> return pmu_base_addr + S5P_INFORM1;
> }
> diff --git a/arch/arm/plat-samsung/cpu.c b/arch/arm/plat-samsung/cpu.c
> index e1ba88ba31d8..8acba21bbf4b 100644
> --- a/arch/arm/plat-samsung/cpu.c
> +++ b/arch/arm/plat-samsung/cpu.c
> @@ -14,13 +14,6 @@
> #include <plat/cpu.h>
>
> 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 s3c64xx_init_cpu(void)
> {
> @@ -34,15 +27,5 @@ void __init s3c64xx_init_cpu(void)
> samsung_cpu_id = readl_relaxed(S3C_VA_SYS + 0xA1C);
> }
>
> - samsung_cpu_rev = 0;
> -
> - pr_info("Samsung CPU ID: 0x%08lx\n", samsung_cpu_id);
> -}
> -
> -void __init s5p_init_cpu(const void __iomem *cpuid_addr)
> -{
> - samsung_cpu_id = readl_relaxed(cpuid_addr);
> - samsung_cpu_rev = samsung_cpu_id & 0xFF;
> -
> pr_info("Samsung CPU ID: 0x%08lx\n", samsung_cpu_id);
> }
> diff --git a/arch/arm/plat-samsung/include/plat/cpu.h b/arch/arm/plat-samsung/include/plat/cpu.h
> index fadcddbea064..02d7f991d5a3 100644
> --- a/arch/arm/plat-samsung/include/plat/cpu.h
> +++ b/arch/arm/plat-samsung/include/plat/cpu.h
> @@ -111,8 +111,6 @@ extern void s3c24xx_init_io(struct map_desc *mach_desc, int size);
> extern void s3c64xx_init_cpu(void);
> extern void s5p_init_cpu(const void __iomem *cpuid_addr);

You can remove it as well.

Best regards,
Krzysztof

>
> -extern unsigned int samsung_rev(void);
> -
> 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/include/plat/map-s5p.h b/arch/arm/plat-samsung/include/plat/map-s5p.h
> index d69a0ca09fb5..3812085f8761 100644
> --- a/arch/arm/plat-samsung/include/plat/map-s5p.h
> +++ b/arch/arm/plat-samsung/include/plat/map-s5p.h
> @@ -9,8 +9,6 @@
> #ifndef __ASM_PLAT_MAP_S5P_H
> #define __ASM_PLAT_MAP_S5P_H __FILE__
>
> -#define S5P_VA_CHIPID S3C_ADDR(0x02000000)
> -
> #define VA_VIC(x) (S3C_VA_IRQ + ((x) * 0x10000))
> #define VA_VIC0 VA_VIC(0)
> #define VA_VIC1 VA_VIC(1)
> --
> 2.20.0
>