Add the rt linux 4.1.3-rt3 as base

[kvmfornfv.git] / kernel / drivers / power / reset / rmobile-reset.c

diff --git a/kernel/drivers/power/reset/rmobile-reset.c b/kernel/drivers/power/reset/rmobile-reset.c
new file mode 100644 (file)
index 0000000..e6569df
--- /dev/null
+++ b/kernel/drivers/power/reset/rmobile-reset.c
@@ -0,0 +1,91 @@
+/*
+ * Renesas R-Mobile Reset Driver
+ *
+ * Copyright (C) 2014 Glider bvba
+ *
+ * This file is subject to the terms and conditions of the GNU General Public
+ * License.  See the file "COPYING" in the main directory of this archive
+ * for more details.
+ */
+
+#include <linux/io.h>
+#include <linux/module.h>
+#include <linux/notifier.h>
+#include <linux/of_address.h>
+#include <linux/platform_device.h>
+#include <linux/printk.h>
+#include <linux/reboot.h>
+
+/* SYSC Register Bank 2 */
+#define RESCNT2                0x20            /* Reset Control Register 2 */
+
+/* Reset Control Register 2 */
+#define RESCNT2_PRES   0x80000000      /* Soft power-on reset */
+
+static void __iomem *sysc_base2;
+
+static int rmobile_reset_handler(struct notifier_block *this,
+                                unsigned long mode, void *cmd)
+{
+       pr_debug("%s %lu\n", __func__, mode);
+
+       /* Let's assume we have acquired the HPB semaphore */
+       writel(RESCNT2_PRES, sysc_base2 + RESCNT2);
+
+       return NOTIFY_DONE;
+}
+
+static struct notifier_block rmobile_reset_nb = {
+       .notifier_call = rmobile_reset_handler,
+       .priority = 192,
+};
+
+static int rmobile_reset_probe(struct platform_device *pdev)
+{
+       int error;
+
+       sysc_base2 = of_iomap(pdev->dev.of_node, 1);
+       if (!sysc_base2)
+               return -ENODEV;
+
+       error = register_restart_handler(&rmobile_reset_nb);
+       if (error) {
+               dev_err(&pdev->dev,
+                       "cannot register restart handler (err=%d)\n", error);
+               goto fail_unmap;
+       }
+
+       return 0;
+
+fail_unmap:
+       iounmap(sysc_base2);
+       return error;
+}
+
+static int rmobile_reset_remove(struct platform_device *pdev)
+{
+       unregister_restart_handler(&rmobile_reset_nb);
+       iounmap(sysc_base2);
+       return 0;
+}
+
+static const struct of_device_id rmobile_reset_of_match[] = {
+       { .compatible = "renesas,sysc-rmobile", },
+       { /* sentinel */ }
+};
+MODULE_DEVICE_TABLE(of, rmobile_reset_of_match);
+
+static struct platform_driver rmobile_reset_driver = {
+       .probe = rmobile_reset_probe,
+       .remove = rmobile_reset_remove,
+       .driver = {
+               .name = "rmobile_reset",
+               .of_match_table = rmobile_reset_of_match,
+       },
+};
+
+module_platform_driver(rmobile_reset_driver);
+
+MODULE_DESCRIPTION("Renesas R-Mobile Reset Driver");
+MODULE_AUTHOR("Geert Uytterhoeven <geert+renesas@glider.be>");
+MODULE_LICENSE("GPL v2");