[PATCH v3 2/3] nvmem: uniphier: add UniPhier eFuse driver

[Keiji Hayashibara]

Add eFuse driver for Socionext UniPhier series SoC.
Note that eFuse device is under soc-glue and this register
implements as read only.

Signed-off-by: Keiji Hayashibara 
---
 drivers/nvmem/Kconfig  | 11 +
 drivers/nvmem/Makefile |  2 +
 drivers/nvmem/uniphier-efuse.c | 97 ++
 3 files changed, 110 insertions(+)
 create mode 100644 drivers/nvmem/uniphier-efuse.c

diff --git a/drivers/nvmem/Kconfig b/drivers/nvmem/Kconfig
index 101ced4..9c32cfe 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 1731406..2d07162 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 000..2bb45c4
--- /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 
+#include 
+#include 
+#include 
+#include 
+
+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 = >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();
+   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 ");
+MODULE_DESCRIPTION("UniPhier eFuse driver");
+MODULE_LICENSE("GPL v2");
-- 
2.7.4

[PATCH v3 2/3] nvmem: uniphier: add UniPhier eFuse driver

[Keiji Hayashibara]

Add eFuse driver for Socionext UniPhier series SoC.
Note that eFuse device is under soc-glue and this register
implements as read only.

Signed-off-by: Keiji Hayashibara 
---
 drivers/nvmem/Kconfig  | 11 +
 drivers/nvmem/Makefile |  2 +
 drivers/nvmem/uniphier-efuse.c | 97 ++
 3 files changed, 110 insertions(+)
 create mode 100644 drivers/nvmem/uniphier-efuse.c

diff --git a/drivers/nvmem/Kconfig b/drivers/nvmem/Kconfig
index 101ced4..9c32cfe 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 1731406..2d07162 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 000..2bb45c4
--- /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 
+#include 
+#include 
+#include 
+#include 
+
+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 = >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();
+   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 ");
+MODULE_DESCRIPTION("UniPhier eFuse driver");
+MODULE_LICENSE("GPL v2");
-- 
2.7.4