Exynos SoCs have Chipid, for identification of product IDs and SoC revisions. This patch intends to provide initialization code for all these functionalities, at the same time it provides some sysfs entries for accessing these information to user-space. This driver uses existing binding for exynos-chipid. CC: Grant Likely <grant.likely@xxxxxxxxxx> CC: Rob Herring <robh+dt@xxxxxxxxxx> CC: Linus Walleij <linus.walleij@xxxxxxxxxx> Signed-off-by: Pankaj Dubey <pankaj.dubey@xxxxxxxxxxx> --- drivers/soc/samsung/Kconfig | 5 ++ drivers/soc/samsung/Makefile | 1 + drivers/soc/samsung/exynos-chipid.c | 148 ++++++++++++++++++++++++++++++++++++ 3 files changed, 154 insertions(+) create mode 100644 drivers/soc/samsung/exynos-chipid.c diff --git a/drivers/soc/samsung/Kconfig b/drivers/soc/samsung/Kconfig index 2455339..f9ab858 100644 --- a/drivers/soc/samsung/Kconfig +++ b/drivers/soc/samsung/Kconfig @@ -14,4 +14,9 @@ config EXYNOS_PM_DOMAINS bool "Exynos PM domains" if COMPILE_TEST depends on PM_GENERIC_DOMAINS || COMPILE_TEST +config EXYNOS_CHIPID + bool "Exynos Chipid controller driver" if COMPILE_TEST + depends on (ARM && ARCH_EXYNOS) || ((ARM || ARM64) && COMPILE_TEST) + select SOC_BUS + endif diff --git a/drivers/soc/samsung/Makefile b/drivers/soc/samsung/Makefile index 3619f2e..2a8a85e 100644 --- a/drivers/soc/samsung/Makefile +++ b/drivers/soc/samsung/Makefile @@ -1,3 +1,4 @@ obj-$(CONFIG_EXYNOS_PMU) += exynos-pmu.o exynos3250-pmu.o exynos4-pmu.o \ exynos5250-pmu.o exynos5420-pmu.o obj-$(CONFIG_EXYNOS_PM_DOMAINS) += pm_domains.o +obj-$(CONFIG_EXYNOS_CHIPID) += exynos-chipid.o diff --git a/drivers/soc/samsung/exynos-chipid.c b/drivers/soc/samsung/exynos-chipid.c new file mode 100644 index 0000000..9761e54 --- /dev/null +++ b/drivers/soc/samsung/exynos-chipid.c @@ -0,0 +1,148 @@ +/* + * Copyright (c) 2016 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/of_platform.h> +#include <linux/platform_device.h> +#include <linux/slab.h> +#include <linux/sys_soc.h> + +#define EXYNOS3250_SOC_ID 0xE3472000 +#define EXYNOS4210_SOC_ID 0x43210000 +#define EXYNOS4212_SOC_ID 0x43220000 +#define EXYNOS4412_SOC_ID 0xE4412000 +#define EXYNOS4415_SOC_ID 0xE4415000 +#define EXYNOS5250_SOC_ID 0x43520000 +#define EXYNOS5260_SOC_ID 0xE5260000 +#define EXYNOS5410_SOC_ID 0xE5410000 +#define EXYNOS5420_SOC_ID 0xE5420000 +#define EXYNOS5440_SOC_ID 0xE5440000 +#define EXYNOS5800_SOC_ID 0xE5422000 + +#define EXYNOS_SOC_MASK 0xFFFFF000 + +#define EXYNOS4210_REV_0 0x0 +#define EXYNOS4210_REV_1_0 0x10 +#define EXYNOS4210_REV_1_1 0x11 + +#define EXYNOS_SUBREV_MASK (0xF << 4) +#define EXYNOS_MAINREV_MASK (0xF << 0) +#define EXYNOS_REV_MASK (EXYNOS_SUBREV_MASK | EXYNOS_MAINREV_MASK) + + +static const char * __init product_id_to_soc_id(unsigned int product_id) +{ + const char *soc_name; + unsigned int soc_id = product_id & EXYNOS_SOC_MASK; + + switch (soc_id) { + case EXYNOS3250_SOC_ID: + soc_name = "EXYNOS3250"; + break; + case EXYNOS4210_SOC_ID: + soc_name = "EXYNOS4210"; + break; + case EXYNOS4212_SOC_ID: + soc_name = "EXYNOS4212"; + break; + case EXYNOS4412_SOC_ID: + soc_name = "EXYNOS4412"; + break; + case EXYNOS4415_SOC_ID: + soc_name = "EXYNOS4415"; + break; + case EXYNOS5250_SOC_ID: + soc_name = "EXYNOS5250"; + break; + case EXYNOS5260_SOC_ID: + soc_name = "EXYNOS5260"; + break; + case EXYNOS5420_SOC_ID: + soc_name = "EXYNOS5420"; + break; + case EXYNOS5440_SOC_ID: + soc_name = "EXYNOS5440"; + break; + case EXYNOS5800_SOC_ID: + soc_name = "EXYNOS5800"; + break; + default: + soc_name = "UNKNOWN"; + } + return soc_name; +} + +static const struct of_device_id of_exynos_chipid_ids[] = { + { + .compatible = "samsung,exynos4210-chipid", + }, + {}, +}; + +/** + * exynos_chipid_early_init: Early chipid initialization + */ +int __init exynos_chipid_early_init(void) +{ + struct soc_device_attribute *soc_dev_attr; + struct soc_device *soc_dev; + struct device_node *root; + struct device_node *np; + void __iomem *exynos_chipid_base; + const struct of_device_id *match; + u32 product_id; + u32 revision; + + np = of_find_matching_node_and_match(NULL, + of_exynos_chipid_ids, &match); + if (!np) + return -ENODEV; + + exynos_chipid_base = of_iomap(np, 0); + + if (!exynos_chipid_base) + return PTR_ERR(exynos_chipid_base); + + product_id = __raw_readl(exynos_chipid_base); + revision = product_id & EXYNOS_REV_MASK; + iounmap(exynos_chipid_base); + + soc_dev_attr = kzalloc(sizeof(*soc_dev_attr), GFP_KERNEL); + if (!soc_dev_attr) + return -ENODEV; + + soc_dev_attr->family = "Samsung Exynos"; + + root = of_find_node_by_path("/"); + of_property_read_string(root, "model", &soc_dev_attr->machine); + of_node_put(root); + + soc_dev_attr->revision = kasprintf(GFP_KERNEL, "%x", revision); + soc_dev_attr->soc_id = product_id_to_soc_id(product_id); + + + pr_info("Exynos: CPU[%s] CPU_REV[0x%x] Detected\n", + product_id_to_soc_id(product_id), revision); + + soc_dev = soc_device_register(soc_dev_attr); + if (IS_ERR(soc_dev)) { + kfree(soc_dev_attr->revision); + kfree_const(soc_dev_attr->soc_id); + kfree(soc_dev_attr); + return PTR_ERR(soc_dev); + } + + return 0; +} +early_initcall(exynos_chipid_early_init); -- 2.7.4 -- 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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