Add the rt linux 4.1.3-rt3 as base

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

diff --git a/kernel/drivers/soc/versatile/soc-integrator.c b/kernel/drivers/soc/versatile/soc-integrator.c
new file mode 100644 (file)
index 0000000..a5d7d39
--- /dev/null
+++ b/kernel/drivers/soc/versatile/soc-integrator.c
@@ -0,0 +1,155 @@
+/*
+ * 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>
+
+#define INTEGRATOR_HDR_ID_OFFSET       0x00
+
+static u32 integrator_coreid;
+
+static const struct of_device_id integrator_cm_match[] = {
+       { .compatible = "arm,core-module-integrator", },
+       { }
+};
+
+static const char *integrator_arch_str(u32 id)
+{
+       switch ((id >> 16) & 0xff) {
+       case 0x00:
+               return "ASB little-endian";
+       case 0x01:
+               return "AHB little-endian";
+       case 0x03:
+               return "AHB-Lite system bus, bi-endian";
+       case 0x04:
+               return "AHB";
+       case 0x08:
+               return "AHB system bus, ASB processor bus";
+       default:
+               return "Unknown";
+       }
+}
+
+static const char *integrator_fpga_str(u32 id)
+{
+       switch ((id >> 12) & 0xf) {
+       case 0x01:
+               return "XC4062";
+       case 0x02:
+               return "XC4085";
+       case 0x03:
+               return "XVC600";
+       case 0x04:
+               return "EPM7256AE (Altera PLD)";
+       default:
+               return "Unknown";
+       }
+}
+
+static ssize_t integrator_get_manf(struct device *dev,
+                             struct device_attribute *attr,
+                             char *buf)
+{
+       return sprintf(buf, "%02x\n", integrator_coreid >> 24);
+}
+
+static struct device_attribute integrator_manf_attr =
+       __ATTR(manufacturer,  S_IRUGO, integrator_get_manf,  NULL);
+
+static ssize_t integrator_get_arch(struct device *dev,
+                             struct device_attribute *attr,
+                             char *buf)
+{
+       return sprintf(buf, "%s\n", integrator_arch_str(integrator_coreid));
+}
+
+static struct device_attribute integrator_arch_attr =
+       __ATTR(arch,  S_IRUGO, integrator_get_arch,  NULL);
+
+static ssize_t integrator_get_fpga(struct device *dev,
+                             struct device_attribute *attr,
+                             char *buf)
+{
+       return sprintf(buf, "%s\n", integrator_fpga_str(integrator_coreid));
+}
+
+static struct device_attribute integrator_fpga_attr =
+       __ATTR(fpga,  S_IRUGO, integrator_get_fpga,  NULL);
+
+static ssize_t integrator_get_build(struct device *dev,
+                              struct device_attribute *attr,
+                              char *buf)
+{
+       return sprintf(buf, "%02x\n", (integrator_coreid >> 4) & 0xFF);
+}
+
+static struct device_attribute integrator_build_attr =
+       __ATTR(build,  S_IRUGO, integrator_get_build,  NULL);
+
+static int __init integrator_soc_init(void)
+{
+       static struct regmap *syscon_regmap;
+       struct soc_device *soc_dev;
+       struct soc_device_attribute *soc_dev_attr;
+       struct device_node *np;
+       struct device *dev;
+       u32 val;
+       int ret;
+
+       np = of_find_matching_node(NULL, integrator_cm_match);
+       if (!np)
+               return -ENODEV;
+
+       syscon_regmap = syscon_node_to_regmap(np);
+       if (IS_ERR(syscon_regmap))
+               return PTR_ERR(syscon_regmap);
+
+       ret = regmap_read(syscon_regmap, INTEGRATOR_HDR_ID_OFFSET,
+                         &val);
+       if (ret)
+               return -ENODEV;
+       integrator_coreid = val;
+
+       soc_dev_attr = kzalloc(sizeof(*soc_dev_attr), GFP_KERNEL);
+       if (!soc_dev_attr)
+               return -ENOMEM;
+
+       soc_dev_attr->soc_id = "Integrator";
+       soc_dev_attr->machine = "Integrator";
+       soc_dev_attr->family = "Versatile";
+       soc_dev = soc_device_register(soc_dev_attr);
+       if (IS_ERR(soc_dev)) {
+               kfree(soc_dev_attr);
+               return -ENODEV;
+       }
+       dev = soc_device_to_device(soc_dev);
+
+       device_create_file(dev, &integrator_manf_attr);
+       device_create_file(dev, &integrator_arch_attr);
+       device_create_file(dev, &integrator_fpga_attr);
+       device_create_file(dev, &integrator_build_attr);
+
+       dev_info(dev, "Detected ARM core module:\n");
+       dev_info(dev, "    Manufacturer: %02x\n", (val >> 24));
+       dev_info(dev, "    Architecture: %s\n", integrator_arch_str(val));
+       dev_info(dev, "    FPGA: %s\n", integrator_fpga_str(val));
+       dev_info(dev, "    Build: %02x\n", (val >> 4) & 0xFF);
+       dev_info(dev, "    Rev: %c\n", ('A' + (val & 0x03)));
+
+       return 0;
+}
+device_initcall(integrator_soc_init);