Exynos SoCs have Chipid IP, for identification of product IDs and SoC revistions. Till now we are using static macros such as soc_is_exynosxxxx and #ifdefs for run time identification of SoCs and their revisions. This is leading to add new Kconfig, soc_is_exynosXXXX definitions each time new SoC support is getting added. So this driver intends to provide initialization code all these functionalites and thus helping in removing macros. CC: Arnd Bergmann <arnd@xxxxxxxx> CC: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx> Signed-off-by: Pankaj Dubey <pankaj.dubey@xxxxxxxxxxx> --- drivers/misc/Kconfig | 7 ++++ drivers/misc/Makefile | 1 + drivers/misc/exynos-chipid.c | 83 ++++++++++++++++++++++++++++++++++++++++++ include/linux/exynos-soc.h | 46 +++++++++++++++++++++++ 4 files changed, 137 insertions(+) create mode 100644 drivers/misc/exynos-chipid.c create mode 100644 include/linux/exynos-soc.h diff --git a/drivers/misc/Kconfig b/drivers/misc/Kconfig index 1cb7408..f313bd3 100644 --- a/drivers/misc/Kconfig +++ b/drivers/misc/Kconfig @@ -515,6 +515,13 @@ config SRAM the genalloc API. It is supposed to be used for small on-chip SRAM areas found on many SoCs. +config EXYNOS_CHIPID + tristate "Support Exynos CHIPID" + default y + depends on ARCH_EXYNOS || ARM64 + help + If you say Y here you get support for the Exynos CHIP id. + source "drivers/misc/c2port/Kconfig" source "drivers/misc/eeprom/Kconfig" source "drivers/misc/cb710/Kconfig" diff --git a/drivers/misc/Makefile b/drivers/misc/Makefile index 7eb4b69..48c8fb5 100644 --- a/drivers/misc/Makefile +++ b/drivers/misc/Makefile @@ -55,3 +55,4 @@ obj-$(CONFIG_SRAM) += sram.o obj-y += mic/ obj-$(CONFIG_GENWQE) += genwqe/ obj-$(CONFIG_ECHO) += echo/ +obj-$(CONFIG_EXYNOS_CHIPID) += exynos-chipid.o diff --git a/drivers/misc/exynos-chipid.c b/drivers/misc/exynos-chipid.c new file mode 100644 index 0000000..eb23339 --- /dev/null +++ b/drivers/misc/exynos-chipid.c @@ -0,0 +1,83 @@ +/* + * Copyright (c) 2014-2015 Samsung Electronics Co., Ltd. + * http://www.samsung.com/ + * + * EXYNOS - CHIP ID support + * Author: Pankaj Dubey <pankaj.dubey@xxxxxxxxxxx> + * + * 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 <linux/io.h> +#include <linux/of.h> +#include <linux/of_address.h> +#include <linux/exynos-soc.h> + +#define EXYNOS4_SOC_MASK 0xFFFE0 +#define EXYNOS5_SOC_MASK 0xFFFFF + +#define PROD_ID_SHIFT (12) + +static void __iomem *exynos_chipid_base; +unsigned int exynos_soc_id = EXYNOS_SOC_UNKNOWN; +unsigned int exynos_soc_rev; + +struct exynos_chipid_data { + unsigned int product_id_mask; + unsigned int product_id_shift; +}; + +static struct exynos_chipid_data exynos4_chipid_data = { + .product_id_mask = EXYNOS4_SOC_MASK, + .product_id_shift = PROD_ID_SHIFT, +}; + +static struct exynos_chipid_data exynos5_chipid_data = { + .product_id_mask = EXYNOS5_SOC_MASK, + .product_id_shift = PROD_ID_SHIFT, +}; + +static struct of_device_id of_exynos_chipid_ids[] = { + { + .compatible = "samsung,exynos4-chipid", + .data = (void *)&exynos4_chipid_data, + }, + { + .compatible = "samsung,exynos5-chipid", + .data = (void *)&exynos5_chipid_data, + }, + {}, +}; + +/** + * early_exynos_chipid_init - Early chipid initialization + */ +void __init early_exynos_chipid_init(void) +{ + struct device_node *np = NULL; + const struct of_device_id *match; + struct exynos_chipid_data *chipid_data; + int pro_id; + + if (!exynos_chipid_base) { + np = of_find_matching_node_and_match(NULL, + of_exynos_chipid_ids, &match); + if (!np) + panic("%s, failed to find chipid node\n", __func__); + + chipid_data = (struct exynos_chipid_data *) match->data; + exynos_chipid_base = of_iomap(np, 0); + + if (!exynos_chipid_base) + panic("%s: failed to map registers\n", __func__); + + pro_id = __raw_readl(exynos_chipid_base); + exynos_soc_id = (pro_id >> chipid_data->product_id_shift) + & chipid_data->product_id_mask; + exynos_soc_rev = pro_id & 0xFF; + pr_info("Exynos: CPUID[0x%x] CPU_REV[0x%x] Detected\n", + exynos_soc_id, exynos_soc_rev); + } +} diff --git a/include/linux/exynos-soc.h b/include/linux/exynos-soc.h new file mode 100644 index 0000000..cb3ae06 --- /dev/null +++ b/include/linux/exynos-soc.h @@ -0,0 +1,46 @@ +/* + * Copyright (c) 2014 Samsung Electronics Co., Ltd. + * http://www.samsung.com + * + * Header for EXYNOS SoC Chipid 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. + */ + +#ifndef __EXYNOS_SOC_H +#define __EXYNOS_SOC_H + +/* enum holding product id of Exynos SoC + * Any new Exynos SoC product id should be added here + */ +enum exynos_soc_id { + EXYNOS4210 = 0xE4210, + EXYNOS4212 = 0xE4412, + EXYNOS4412 = 0xE4412, + EXYNOS5250 = 0x43520, + EXYNOS5420 = 0xE5420, + EXYNOS5440 = 0xE5440, + EXYNOS_SOC_UNKNOWN = -1, +}; + +/* enum holding revision id of Exynos SoC + * Any new Exynos SoC revision id should be added here + */ +enum exynos_soc_rev { + EXYNOS4210_REV_0 = 0x0, + EXYNOS4210_REV_1_0 = 0x10, + EXYNOS4210_REV_1_1 = 0x11, +}; + +/* Since we need chipid to be initialized as early as possible + * during secondary core bootup adding early initialization function + * Note: This should be called only after device tree gets unflatten + */ +extern void early_exynos_chipid_init(void); + +extern unsigned int exynos_soc_id; +extern unsigned int exynos_soc_rev; + +#endif /* __EXYNOS_SOC_H */ -- 1.7.10.4 -- To unsubscribe from this list: send the line "unsubscribe linux-samsung-soc" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
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