Exynos SoCs have Chipid, for identification of product IDs and SoC revisions. This patch intendes to provide initialization code for all these functionalites.
This driver usese existing binding for exnos-chipid. CC: Grant Likely <grant.lik...@linaro.org> CC: Rob Herring <robh...@kernel.org> CC: Linus Walleij <linus.wall...@linaro.org> Signed-off-by: Pankaj Dubey <pankaj.du...@samsung.com> --- drivers/soc/Kconfig | 1 + drivers/soc/Makefile | 1 + drivers/soc/samsung/Kconfig | 14 +++ drivers/soc/samsung/Makefile | 1 + drivers/soc/samsung/exynos-chipid.c | 168 +++++++++++++++++++++++++++++++++ include/linux/soc/samsung/exynos-soc.h | 51 ++++++++++ 6 files changed, 236 insertions(+) create mode 100644 drivers/soc/samsung/Kconfig create mode 100644 drivers/soc/samsung/Makefile create mode 100644 drivers/soc/samsung/exynos-chipid.c create mode 100644 include/linux/soc/samsung/exynos-soc.h diff --git a/drivers/soc/Kconfig b/drivers/soc/Kconfig index 76d6bd4..c3abfbe 100644 --- a/drivers/soc/Kconfig +++ b/drivers/soc/Kconfig @@ -1,6 +1,7 @@ menu "SOC (System On Chip) specific Drivers" source "drivers/soc/qcom/Kconfig" +source "drivers/soc/samsung/Kconfig" source "drivers/soc/ti/Kconfig" source "drivers/soc/versatile/Kconfig" diff --git a/drivers/soc/Makefile b/drivers/soc/Makefile index 063113d..620366f 100644 --- a/drivers/soc/Makefile +++ b/drivers/soc/Makefile @@ -3,6 +3,7 @@ # obj-$(CONFIG_ARCH_QCOM) += qcom/ +obj-$(CONFIG_SOC_SAMSUNG) += samsung/ obj-$(CONFIG_ARCH_TEGRA) += tegra/ obj-$(CONFIG_SOC_TI) += ti/ obj-$(CONFIG_PLAT_VERSATILE) += versatile/ diff --git a/drivers/soc/samsung/Kconfig b/drivers/soc/samsung/Kconfig new file mode 100644 index 0000000..2d83652 --- /dev/null +++ b/drivers/soc/samsung/Kconfig @@ -0,0 +1,14 @@ +# +# SAMSUNG SoC drivers +# +menu "Samsung SOC driver support" + +config SOC_SAMSUNG + bool + +config EXYNOS_CHIPID + bool + depends on ARCH_EXYNOS + select SOC_BUS + +endmenu diff --git a/drivers/soc/samsung/Makefile b/drivers/soc/samsung/Makefile new file mode 100644 index 0000000..855ca05 --- /dev/null +++ b/drivers/soc/samsung/Makefile @@ -0,0 +1 @@ +obj-$(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..8968f83 --- /dev/null +++ b/drivers/soc/samsung/exynos-chipid.c @@ -0,0 +1,168 @@ +/* + * Copyright (c) 2014 Samsung Electronics Co., Ltd. + * http://www.samsung.com/ + * + * EXYNOS - CHIP ID support + * Author: Pankaj Dubey <pankaj.du...@samsung.com> + * + * 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> +#include <linux/soc/samsung/exynos-soc.h> + +#define EXYNOS_SUBREV_MASK (0xF << 4) +#define EXYNOS_MAINREV_MASK (0xF << 0) +#define EXYNOS_REV_MASK (EXYNOS_SUBREV_MASK | EXYNOS_MAINREV_MASK) + +static void __iomem *exynos_chipid_base; + +struct exynos_chipid_info exynos_soc_info; +EXPORT_SYMBOL(exynos_soc_info); + +static const char * __init product_id_to_name(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[] __initconst = { + { + .compatible = "samsung,exynos4210-chipid", + }, + {}, +}; + +/** + * exynos_chipid_early_init: Early chipid initialization + * @dev: pointer to chipid device + */ +void __init exynos_chipid_early_init(struct device *dev) +{ + struct device_node *np; + const struct of_device_id *match; + + if (exynos_chipid_base) + return; + + if (!dev) + np = of_find_matching_node_and_match(NULL, + of_exynos_chipid_ids, &match); + else + np = dev->of_node; + + if (!np) + panic("%s, failed to find chipid node\n", __func__); + + exynos_chipid_base = of_iomap(np, 0); + + if (!exynos_chipid_base) + panic("%s: failed to map registers\n", __func__); + + exynos_soc_info.product_id = __raw_readl(exynos_chipid_base); + exynos_soc_info.revision = exynos_soc_info.product_id & EXYNOS_REV_MASK; +} + +static int __init exynos_chipid_probe(struct platform_device *pdev) +{ + struct soc_device_attribute *soc_dev_attr; + struct soc_device *soc_dev; + struct device_node *root; + int ret; + + exynos_chipid_early_init(&pdev->dev); + + 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("/"); + ret = of_property_read_string(root, "model", &soc_dev_attr->machine); + of_node_put(root); + if (ret) + goto free_soc; + + soc_dev_attr->revision = kasprintf(GFP_KERNEL, "%d", + exynos_soc_info.revision); + if (!soc_dev_attr->revision) + goto free_soc; + + soc_dev_attr->soc_id = product_id_to_name(exynos_soc_info.product_id); + + soc_dev = soc_device_register(soc_dev_attr); + if (IS_ERR(soc_dev)) + goto free_rev; + + soc_device_to_device(soc_dev); + + dev_info(&pdev->dev, "Exynos: CPU[%s] CPU_REV[0x%x] Detected\n", + product_id_to_name(exynos_soc_info.product_id), + exynos_soc_info.revision); + return 0; +free_rev: + kfree(soc_dev_attr->revision); +free_soc: + kfree(soc_dev_attr); + return -EINVAL; +} + +static struct platform_driver exynos_chipid_driver __initdata = { + .driver = { + .name = "exynos-chipid", + .of_match_table = of_exynos_chipid_ids, + }, + .probe = exynos_chipid_probe, +}; + +static int __init exynos_chipid_init(void) +{ + return platform_driver_register(&exynos_chipid_driver); +} +core_initcall(exynos_chipid_init); + diff --git a/include/linux/soc/samsung/exynos-soc.h b/include/linux/soc/samsung/exynos-soc.h new file mode 100644 index 0000000..d2d9f05 --- /dev/null +++ b/include/linux/soc/samsung/exynos-soc.h @@ -0,0 +1,51 @@ +/* + * 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 + +#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 + +/** + * Struct exynos_chipid_info + * @soc_product_id: product id allocated to exynos SoC + * @soc_revision: revision of exynos SoC + */ + +struct exynos_chipid_info { + u32 product_id; + u32 revision; +}; + +extern struct exynos_chipid_info exynos_soc_info; + +/* Since we need chipid to be initialized as early as possible + * during secondary core bootup adding early initialization function + */ +extern void exynos_chipid_early_init(struct device *dev); + +#endif /* __EXYNOS_SOC_H */ -- 2.2.0 -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
