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path: root/drivers/soc/versatile/soc-realview.c
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Diffstat (limited to 'drivers/soc/versatile/soc-realview.c')
-rw-r--r--drivers/soc/versatile/soc-realview.c132
1 files changed, 132 insertions, 0 deletions
diff --git a/drivers/soc/versatile/soc-realview.c b/drivers/soc/versatile/soc-realview.c
new file mode 100644
index 0000000000..c6876d232d
--- /dev/null
+++ b/drivers/soc/versatile/soc-realview.c
@@ -0,0 +1,132 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/*
+ * Copyright (C) 2014 Linaro Ltd.
+ *
+ * Author: Linus Walleij <linus.walleij@linaro.org>
+ */
+#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_arch_str(u32 id)
+{
+ switch ((id >> 8) & 0xf) {
+ case 0x04:
+ return "AHB";
+ case 0x05:
+ return "Multi-layer AXI";
+ default:
+ return "Unknown";
+ }
+}
+
+static ssize_t
+manufacturer_show(struct device *dev, struct device_attribute *attr, char *buf)
+{
+ return sprintf(buf, "%02x\n", realview_coreid >> 24);
+}
+
+static DEVICE_ATTR_RO(manufacturer);
+
+static ssize_t
+board_show(struct device *dev, struct device_attribute *attr, char *buf)
+{
+ return sprintf(buf, "HBI-%03x\n", ((realview_coreid >> 16) & 0xfff));
+}
+
+static DEVICE_ATTR_RO(board);
+
+static ssize_t
+fpga_show(struct device *dev, struct device_attribute *attr, char *buf)
+{
+ return sprintf(buf, "%s\n", realview_arch_str(realview_coreid));
+}
+
+static DEVICE_ATTR_RO(fpga);
+
+static ssize_t
+build_show(struct device *dev, struct device_attribute *attr, char *buf)
+{
+ return sprintf(buf, "%02x\n", (realview_coreid & 0xFF));
+}
+
+static DEVICE_ATTR_RO(build);
+
+static struct attribute *realview_attrs[] = {
+ &dev_attr_manufacturer.attr,
+ &dev_attr_board.attr,
+ &dev_attr_fpga.attr,
+ &dev_attr_build.attr,
+ NULL
+};
+
+ATTRIBUTE_GROUPS(realview);
+
+static int realview_soc_probe(struct platform_device *pdev)
+{
+ 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_attr->custom_attr_group = realview_groups[0];
+ 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;
+
+ dev_info(&pdev->dev, "RealView Syscon Core ID: 0x%08x, HBI-%03x\n",
+ realview_coreid,
+ ((realview_coreid >> 16) & 0xfff));
+ /* 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);