Add the rt linux 4.1.3-rt3 as base

[kvmfornfv.git] / kernel / drivers / soc / versatile / soc-realview.c

diff --git a/kernel/drivers/soc/versatile/soc-realview.c b/kernel/drivers/soc/versatile/soc-realview.c
new file mode 100644 (file)
index 0000000..1a07bf5
--- /dev/null
+++ b/kernel/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,
+       },
+};
+module_platform_driver(realview_soc_driver);