diff options
Diffstat (limited to 'drivers/nvmem')
| -rw-r--r-- | drivers/nvmem/Kconfig | 11 | ||||
| -rw-r--r-- | drivers/nvmem/Makefile | 2 | ||||
| -rw-r--r-- | drivers/nvmem/uniphier-efuse.c | 97 |
3 files changed, 110 insertions, 0 deletions
diff --git a/drivers/nvmem/Kconfig b/drivers/nvmem/Kconfig index eb09916744bf..ff505af064ba 100644 --- a/drivers/nvmem/Kconfig +++ b/drivers/nvmem/Kconfig @@ -123,6 +123,17 @@ config NVMEM_SUNXI_SID This driver can also be built as a module. If so, the module will be called nvmem_sunxi_sid. +config UNIPHIER_EFUSE + tristate "UniPhier SoCs eFuse support" + depends on ARCH_UNIPHIER || COMPILE_TEST + depends on HAS_IOMEM + help + This is a simple driver to dump specified values of UniPhier SoC + from eFuse. + + This driver can also be built as a module. If so, the module + will be called nvmem-uniphier-efuse. + config NVMEM_VF610_OCOTP tristate "VF610 SoC OCOTP support" depends on SOC_VF610 || COMPILE_TEST diff --git a/drivers/nvmem/Makefile b/drivers/nvmem/Makefile index 362f394da65d..64849e946d50 100644 --- a/drivers/nvmem/Makefile +++ b/drivers/nvmem/Makefile @@ -26,6 +26,8 @@ obj-$(CONFIG_ROCKCHIP_EFUSE) += nvmem_rockchip_efuse.o nvmem_rockchip_efuse-y := rockchip-efuse.o obj-$(CONFIG_NVMEM_SUNXI_SID) += nvmem_sunxi_sid.o nvmem_sunxi_sid-y := sunxi_sid.o +obj-$(CONFIG_UNIPHIER_EFUSE) += nvmem-uniphier-efuse.o +nvmem-uniphier-efuse-y := uniphier-efuse.o obj-$(CONFIG_NVMEM_VF610_OCOTP) += nvmem-vf610-ocotp.o nvmem-vf610-ocotp-y := vf610-ocotp.o obj-$(CONFIG_MESON_EFUSE) += nvmem_meson_efuse.o diff --git a/drivers/nvmem/uniphier-efuse.c b/drivers/nvmem/uniphier-efuse.c new file mode 100644 index 000000000000..9d278b4e1dc7 --- /dev/null +++ b/drivers/nvmem/uniphier-efuse.c @@ -0,0 +1,97 @@ +/* + * UniPhier eFuse driver + * + * Copyright (C) 2017 Socionext Inc. + * + * 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. + * + * This program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU General Public License for more details. + */ + +#include <linux/device.h> +#include <linux/io.h> +#include <linux/module.h> +#include <linux/nvmem-provider.h> +#include <linux/platform_device.h> + +struct uniphier_efuse_priv { + void __iomem *base; +}; + +static int uniphier_reg_read(void *context, + unsigned int reg, void *_val, size_t bytes) +{ + struct uniphier_efuse_priv *priv = context; + u32 *val = _val; + int offs; + + for (offs = 0; offs < bytes; offs += sizeof(u32)) + *val++ = readl(priv->base + reg + offs); + + return 0; +} + +static int uniphier_efuse_probe(struct platform_device *pdev) +{ + struct device *dev = &pdev->dev; + struct resource *res; + struct nvmem_device *nvmem; + struct nvmem_config econfig = {}; + struct uniphier_efuse_priv *priv; + + priv = devm_kzalloc(dev, sizeof(*priv), GFP_KERNEL); + if (!priv) + return -ENOMEM; + + res = platform_get_resource(pdev, IORESOURCE_MEM, 0); + priv->base = devm_ioremap_resource(dev, res); + if (IS_ERR(priv->base)) + return PTR_ERR(priv->base); + + econfig.stride = 4; + econfig.word_size = 4; + econfig.read_only = true; + econfig.reg_read = uniphier_reg_read; + econfig.size = resource_size(res); + econfig.priv = priv; + econfig.dev = dev; + nvmem = nvmem_register(&econfig); + if (IS_ERR(nvmem)) + return PTR_ERR(nvmem); + + platform_set_drvdata(pdev, nvmem); + + return 0; +} + +static int uniphier_efuse_remove(struct platform_device *pdev) +{ + struct nvmem_device *nvmem = platform_get_drvdata(pdev); + + return nvmem_unregister(nvmem); +} + +static const struct of_device_id uniphier_efuse_of_match[] = { + { .compatible = "socionext,uniphier-efuse",}, + {/* sentinel */}, +}; +MODULE_DEVICE_TABLE(of, uniphier_efuse_of_match); + +static struct platform_driver uniphier_efuse_driver = { + .probe = uniphier_efuse_probe, + .remove = uniphier_efuse_remove, + .driver = { + .name = "uniphier-efuse", + .of_match_table = uniphier_efuse_of_match, + }, +}; +module_platform_driver(uniphier_efuse_driver); + +MODULE_AUTHOR("Keiji Hayashibara <hayashibara.keiji@socionext.com>"); +MODULE_DESCRIPTION("UniPhier eFuse driver"); +MODULE_LICENSE("GPL v2"); |