Add the rt linux 4.1.3-rt3 as base

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

diff --git a/kernel/drivers/power/reset/xgene-reboot.c b/kernel/drivers/power/reset/xgene-reboot.c
new file mode 100644 (file)
index 0000000..f07e93c
--- /dev/null
+++ b/kernel/drivers/power/reset/xgene-reboot.c
@@ -0,0 +1,107 @@
+/*
+ * AppliedMicro X-Gene SoC Reboot Driver
+ *
+ * Copyright (c) 2013, Applied Micro Circuits Corporation
+ * Author: Feng Kan <fkan@apm.com>
+ * Author: Loc Ho <lho@apm.com>
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License as
+ * published by the Free Software Foundation; either version 2 of
+ * the License, or (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place, Suite 330, Boston,
+ * MA 02111-1307 USA
+ *
+ * This driver provides system reboot functionality for APM X-Gene SoC.
+ * For system shutdown, this is board specify. If a board designer
+ * implements GPIO shutdown, use the gpio-poweroff.c driver.
+ */
+#include <linux/delay.h>
+#include <linux/io.h>
+#include <linux/notifier.h>
+#include <linux/of_device.h>
+#include <linux/of_address.h>
+#include <linux/platform_device.h>
+#include <linux/reboot.h>
+#include <linux/stat.h>
+#include <linux/slab.h>
+
+struct xgene_reboot_context {
+       struct device *dev;
+       void *csr;
+       u32 mask;
+       struct notifier_block restart_handler;
+};
+
+static int xgene_restart_handler(struct notifier_block *this,
+                                unsigned long mode, void *cmd)
+{
+       struct xgene_reboot_context *ctx =
+               container_of(this, struct xgene_reboot_context,
+                            restart_handler);
+
+       /* Issue the reboot */
+       writel(ctx->mask, ctx->csr);
+
+       mdelay(1000);
+
+       dev_emerg(ctx->dev, "Unable to restart system\n");
+
+       return NOTIFY_DONE;
+}
+
+static int xgene_reboot_probe(struct platform_device *pdev)
+{
+       struct xgene_reboot_context *ctx;
+       struct device *dev = &pdev->dev;
+       int err;
+
+       ctx = devm_kzalloc(dev, sizeof(*ctx), GFP_KERNEL);
+       if (!ctx)
+               return -ENOMEM;
+
+       ctx->csr = of_iomap(dev->of_node, 0);
+       if (!ctx->csr) {
+               dev_err(dev, "can not map resource\n");
+               return -ENODEV;
+       }
+
+       if (of_property_read_u32(dev->of_node, "mask", &ctx->mask))
+               ctx->mask = 0xFFFFFFFF;
+
+       ctx->dev = dev;
+       ctx->restart_handler.notifier_call = xgene_restart_handler;
+       ctx->restart_handler.priority = 128;
+       err = register_restart_handler(&ctx->restart_handler);
+       if (err)
+               dev_err(dev, "cannot register restart handler (err=%d)\n", err);
+
+       return err;
+}
+
+static const struct of_device_id xgene_reboot_of_match[] = {
+       { .compatible = "apm,xgene-reboot" },
+       {}
+};
+
+static struct platform_driver xgene_reboot_driver = {
+       .probe = xgene_reboot_probe,
+       .driver = {
+               .name = "xgene-reboot",
+               .of_match_table = xgene_reboot_of_match,
+       },
+};
+
+static int __init xgene_reboot_init(void)
+{
+       return platform_driver_register(&xgene_reboot_driver);
+}
+device_initcall(xgene_reboot_init);