File-copy from v4.4.100
This is the result of 'cp' from a linux-stable tree with the 'v4.4.100'
tag checked out (commit 26d6298789e695c9f627ce49a7bbd2286405798a) on
git://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
Please refer to that tree for all history prior to this point.
Change-Id: I8a9ee2aea93cd29c52c847d0ce33091a73ae6afe
diff --git a/drivers/soc/versatile/soc-realview.c b/drivers/soc/versatile/soc-realview.c
new file mode 100644
index 0000000..e642c45
--- /dev/null
+++ b/drivers/soc/versatile/soc-realview.c
@@ -0,0 +1,145 @@
+/*
+ * Copyright (C) 2014 Linaro Ltd.
+ *
+ * Author: Linus Walleij <linus.walleij@linaro.org>
+ *
+ * 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/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 REALVIEW_SYS_ID_OFFSET 0x00
+
+static const struct of_device_id realview_soc_of_match[] = {
+ { .compatible = "arm,realview-eb-soc", },
+ { .compatible = "arm,realview-pb1176-soc", },
+ { .compatible = "arm,realview-pb11mp-soc", },
+ { .compatible = "arm,realview-pba8-soc", },
+ { .compatible = "arm,realview-pbx-soc", },
+ { }
+};
+
+static u32 realview_coreid;
+
+static const char *realview_board_str(u32 id)
+{
+ switch ((id >> 16) & 0xfff) {
+ case 0x0147:
+ return "HBI-0147";
+ default:
+ return "Unknown";
+ }
+}
+
+static const char *realview_arch_str(u32 id)
+{
+ switch ((id >> 8) & 0xf) {
+ case 0x05:
+ return "Multi-layer AXI";
+ default:
+ return "Unknown";
+ }
+}
+
+static ssize_t realview_get_manf(struct device *dev,
+ struct device_attribute *attr,
+ char *buf)
+{
+ return sprintf(buf, "%02x\n", realview_coreid >> 24);
+}
+
+static struct device_attribute realview_manf_attr =
+ __ATTR(manufacturer, S_IRUGO, realview_get_manf, NULL);
+
+static ssize_t realview_get_board(struct device *dev,
+ struct device_attribute *attr,
+ char *buf)
+{
+ return sprintf(buf, "%s\n", realview_board_str(realview_coreid));
+}
+
+static struct device_attribute realview_board_attr =
+ __ATTR(board, S_IRUGO, realview_get_board, NULL);
+
+static ssize_t realview_get_arch(struct device *dev,
+ struct device_attribute *attr,
+ char *buf)
+{
+ return sprintf(buf, "%s\n", realview_arch_str(realview_coreid));
+}
+
+static struct device_attribute realview_arch_attr =
+ __ATTR(fpga, S_IRUGO, realview_get_arch, NULL);
+
+static ssize_t realview_get_build(struct device *dev,
+ struct device_attribute *attr,
+ char *buf)
+{
+ return sprintf(buf, "%02x\n", (realview_coreid & 0xFF));
+}
+
+static struct device_attribute realview_build_attr =
+ __ATTR(build, S_IRUGO, realview_get_build, NULL);
+
+static int realview_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, "regmap");
+ 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 = "RealView";
+ soc_dev_attr->family = "Versatile";
+ soc_dev = soc_device_register(soc_dev_attr);
+ if (IS_ERR(soc_dev)) {
+ kfree(soc_dev_attr);
+ return -ENODEV;
+ }
+ ret = regmap_read(syscon_regmap, REALVIEW_SYS_ID_OFFSET,
+ &realview_coreid);
+ if (ret)
+ return -ENODEV;
+
+ device_create_file(soc_device_to_device(soc_dev), &realview_manf_attr);
+ device_create_file(soc_device_to_device(soc_dev), &realview_board_attr);
+ device_create_file(soc_device_to_device(soc_dev), &realview_arch_attr);
+ device_create_file(soc_device_to_device(soc_dev), &realview_build_attr);
+
+ dev_info(&pdev->dev, "RealView Syscon Core ID: 0x%08x\n",
+ realview_coreid);
+ /* FIXME: add attributes for SoC to sysfs */
+ return 0;
+}
+
+static struct platform_driver realview_soc_driver = {
+ .probe = realview_soc_probe,
+ .driver = {
+ .name = "realview-soc",
+ .of_match_table = realview_soc_of_match,
+ },
+};
+builtin_platform_driver(realview_soc_driver);