[PATCH v2 06/10] soc: Add SoC specific driver support for nuc900

Wan Zongshun
2016-07-10T07:27:26Z

This patch is to add SoC specific driver for nuc970 SoC,
it is for getting nuc970 version id and chip id.

Signed-off-by: Wan Zongshun <mcuos.com@gmail.com>
---
drivers/soc/Kconfig | 1 +
drivers/soc/Makefile | 1 +
drivers/soc/nuvoton/Kconfig | 10 ++++
drivers/soc/nuvoton/Makefile | 1 +
drivers/soc/nuvoton/soc-nuc900.c | 100 +++++++++++++++++++++++++++++++++++++++
5 files changed, 113 insertions(+)
create mode 100644 drivers/soc/nuvoton/Kconfig
create mode 100644 drivers/soc/nuvoton/Makefile
create mode 100644 drivers/soc/nuvoton/soc-nuc900.c

diff --git a/drivers/soc/Kconfig b/drivers/soc/Kconfig
index cb58ef0..2119733 100644
--- a/drivers/soc/Kconfig
+++ b/drivers/soc/Kconfig
@@ -4,6 +4,7 @@ source "drivers/soc/bcm/Kconfig"
source "drivers/soc/brcmstb/Kconfig"
source "drivers/soc/fsl/qe/Kconfig"
source "drivers/soc/mediatek/Kconfig"
+source "drivers/soc/nuvoton/Kconfig"
source "drivers/soc/qcom/Kconfig"
source "drivers/soc/rockchip/Kconfig"
source "drivers/soc/samsung/Kconfig"
diff --git a/drivers/soc/Makefile b/drivers/soc/Makefile
index 380230f..bb1bfba 100644
--- a/drivers/soc/Makefile
+++ b/drivers/soc/Makefile
@@ -8,6 +8,7 @@ obj-$(CONFIG_ARCH_DOVE) += dove/
obj-$(CONFIG_MACH_DOVE) += dove/
obj-y += fsl/
obj-$(CONFIG_ARCH_MEDIATEK) += mediatek/
+obj-$(CONFIG_SOC_NUC900) += nuvoton/
obj-$(CONFIG_ARCH_QCOM) += qcom/
obj-$(CONFIG_ARCH_RENESAS) += renesas/
obj-$(CONFIG_ARCH_ROCKCHIP) += rockchip/
diff --git a/drivers/soc/nuvoton/Kconfig b/drivers/soc/nuvoton/Kconfig
new file mode 100644
index 0000000..53c106c
--- /dev/null
+++ b/drivers/soc/nuvoton/Kconfig
@@ -0,0 +1,10 @@
+#
+# ARM Versatile SoC drivers
+#
+config SOC_NUC900
+ bool "SoC bus device for the nuvoton NUC900 platforms"
+ depends on ARCH_W90X900
+ select SOC_BUS
+ help
+ Include support for the SoC bus on the NUC900 platforms
+ providing some sysfs information about the ASIC variant.
diff --git a/drivers/soc/nuvoton/Makefile b/drivers/soc/nuvoton/Makefile
new file mode 100644
index 0000000..88f9b7e
--- /dev/null
+++ b/drivers/soc/nuvoton/Makefile
@@ -0,0 +1 @@
+obj-$(CONFIG_SOC_NUC900) += soc-nuc900.o
diff --git a/drivers/soc/nuvoton/soc-nuc900.c b/drivers/soc/nuvoton/soc-nuc900.c
new file mode 100644
index 0000000..034ef94
--- /dev/null
+++ b/drivers/soc/nuvoton/soc-nuc900.c
@@ -0,0 +1,100 @@
+/*
+ * Copyright 2016 Wan Zongshun <mcuos.com@gmail.com>
+ *
+ * The code contained herein is licensed under the GNU General Public
+ * License. You may obtain a copy of the GNU General Public License
+ * Version 2 or later at the following locations:
+ *
+ * http://www.opensource.org/licenses/gpl-license.html
+ * http://www.gnu.org/copyleft/gpl.html
+ */
+#include <linux/init.h>
+#include <linux/io.h>
+#include <linux/slab.h>
+#include <linux/sys_soc.h>
+#include <linux/platform_device.h>
+#include <linux/mfd/syscon.h>
+#include <linux/regmap.h>
+#include <linux/of.h>
+
+/* System ID in syscon */
+#define GCR_CHIPID 0x00
+#define GCR_CHIPID_MASK 0x00ffffff
+
+static const struct of_device_id nuc900_soc_of_match[] = {
+ { .compatible = "nuvoton,nuc900-soc", },
+ { }
+};
+
+static u32 nuc900_chipid;
+
+static ssize_t nuc900_get_chipid(struct device *dev,
+ struct device_attribute *attr,
+ char *buf)
+{
+ return sprintf(buf, "0x%x\n", nuc900_chipid & GCR_CHIPID_MASK);
+}
+
+static struct device_attribute nuc900_chipid_attr =
+ __ATTR(manufacturer, S_IRUGO, nuc900_get_chipid, NULL);
+
+static ssize_t nuc900_get_versionid(struct device *dev,
+ struct device_attribute *attr,
+ char *buf)
+{
+ return sprintf(buf, "0x%x\n", (nuc900_chipid >> 24) & 0xff);
+}
+
+static struct device_attribute nuc900_version_attr =
+ __ATTR(board, S_IRUGO, nuc900_get_versionid, NULL);
+
+static int nuc900_soc_probe(struct platform_device *pdev)
+{
+ static struct regmap *syscon_regmap;
+ struct soc_device *soc_dev;
+ struct soc_device_attribute *soc_dev_attr;
+ struct device_node *np = pdev->dev.of_node;
+ int ret;
+
+ syscon_regmap = syscon_regmap_lookup_by_phandle(np, "syscon");
+ if (IS_ERR(syscon_regmap))
+ return PTR_ERR(syscon_regmap);
+
+ soc_dev_attr = kzalloc(sizeof(*soc_dev_attr), GFP_KERNEL);
+ if (!soc_dev_attr)
+ return -ENOMEM;
+
+ ret = of_property_read_string(np, "compatible", &soc_dev_attr->soc_id);
+ if (ret)
+ return -EINVAL;
+
+ soc_dev_attr->machine = "NUC900EVB";
+ soc_dev_attr->family = "NUC900";
+ soc_dev = soc_device_register(soc_dev_attr);
+ if (IS_ERR(soc_dev)) {
+ kfree(soc_dev_attr);
+ return -ENODEV;
+ }
+
+ ret = regmap_read(syscon_regmap, GCR_CHIPID, &nuc900_chipid);
+ if (ret)
+ return -ENODEV;
+
+ device_create_file(soc_device_to_device(soc_dev), &nuc900_chipid_attr);
+ device_create_file(soc_device_to_device(soc_dev), &nuc900_version_attr);
+
+ dev_info(&pdev->dev, "Nuvoton Chip ID: 0x%x, Version ID:0x%x\n",
+ nuc900_chipid & GCR_CHIPID_MASK,
+ (nuc900_chipid >> 24) & 0xff);
+
+ return 0;
+}
+
+static struct platform_driver nuc900_soc_driver = {
+ .probe = nuc900_soc_probe,
+ .driver = {
+ .name = "nuc900-soc",
+ .of_match_table = nuc900_soc_of_match,
+ },
+};
+builtin_platform_driver(nuc900_soc_driver);
--
2.7.4