powerpc/fadump: Do not allow hot-remove memory from fadump reserved area.
[linux/fpc-iii.git] / drivers / power / reset / xgene-reboot.c
blob73c3d93e5318b9ab2c7d6287c01e4a8b83d8de5e
1 /*
2 * AppliedMicro X-Gene SoC Reboot Driver
4 * Copyright (c) 2013, Applied Micro Circuits Corporation
5 * Author: Feng Kan <fkan@apm.com>
6 * Author: Loc Ho <lho@apm.com>
8 * This program is free software; you can redistribute it and/or
9 * modify it under the terms of the GNU General Public License as
10 * published by the Free Software Foundation; either version 2 of
11 * the License, or (at your option) any later version.
13 * This program is distributed in the hope that it will be useful,
14 * but WITHOUT ANY WARRANTY; without even the implied warranty of
15 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
16 * GNU General Public License for more details.
18 * You should have received a copy of the GNU General Public License
19 * along with this program; if not, write to the Free Software
20 * Foundation, Inc., 59 Temple Place, Suite 330, Boston,
21 * MA 02111-1307 USA
23 * This driver provides system reboot functionality for APM X-Gene SoC.
24 * For system shutdown, this is board specify. If a board designer
25 * implements GPIO shutdown, use the gpio-poweroff.c driver.
27 #include <linux/delay.h>
28 #include <linux/io.h>
29 #include <linux/notifier.h>
30 #include <linux/of_device.h>
31 #include <linux/of_address.h>
32 #include <linux/platform_device.h>
33 #include <linux/reboot.h>
34 #include <linux/stat.h>
35 #include <linux/slab.h>
37 struct xgene_reboot_context {
38 struct device *dev;
39 void *csr;
40 u32 mask;
41 struct notifier_block restart_handler;
44 static int xgene_restart_handler(struct notifier_block *this,
45 unsigned long mode, void *cmd)
47 struct xgene_reboot_context *ctx =
48 container_of(this, struct xgene_reboot_context,
49 restart_handler);
51 /* Issue the reboot */
52 writel(ctx->mask, ctx->csr);
54 mdelay(1000);
56 dev_emerg(ctx->dev, "Unable to restart system\n");
58 return NOTIFY_DONE;
61 static int xgene_reboot_probe(struct platform_device *pdev)
63 struct xgene_reboot_context *ctx;
64 struct device *dev = &pdev->dev;
65 int err;
67 ctx = devm_kzalloc(dev, sizeof(*ctx), GFP_KERNEL);
68 if (!ctx)
69 return -ENOMEM;
71 ctx->csr = of_iomap(dev->of_node, 0);
72 if (!ctx->csr) {
73 dev_err(dev, "can not map resource\n");
74 return -ENODEV;
77 if (of_property_read_u32(dev->of_node, "mask", &ctx->mask))
78 ctx->mask = 0xFFFFFFFF;
80 ctx->dev = dev;
81 ctx->restart_handler.notifier_call = xgene_restart_handler;
82 ctx->restart_handler.priority = 128;
83 err = register_restart_handler(&ctx->restart_handler);
84 if (err) {
85 iounmap(ctx->csr);
86 dev_err(dev, "cannot register restart handler (err=%d)\n", err);
89 return err;
92 static const struct of_device_id xgene_reboot_of_match[] = {
93 { .compatible = "apm,xgene-reboot" },
97 static struct platform_driver xgene_reboot_driver = {
98 .probe = xgene_reboot_probe,
99 .driver = {
100 .name = "xgene-reboot",
101 .of_match_table = xgene_reboot_of_match,
105 static int __init xgene_reboot_init(void)
107 return platform_driver_register(&xgene_reboot_driver);
109 device_initcall(xgene_reboot_init);