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,
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>
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
{
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
,
51 /* Issue the reboot */
52 writel(ctx
->mask
, ctx
->csr
);
56 dev_emerg(ctx
->dev
, "Unable to restart system\n");
61 static int xgene_reboot_probe(struct platform_device
*pdev
)
63 struct xgene_reboot_context
*ctx
;
64 struct device
*dev
= &pdev
->dev
;
67 ctx
= devm_kzalloc(dev
, sizeof(*ctx
), GFP_KERNEL
);
71 ctx
->csr
= of_iomap(dev
->of_node
, 0);
73 dev_err(dev
, "can not map resource\n");
77 if (of_property_read_u32(dev
->of_node
, "mask", &ctx
->mask
))
78 ctx
->mask
= 0xFFFFFFFF;
81 ctx
->restart_handler
.notifier_call
= xgene_restart_handler
;
82 ctx
->restart_handler
.priority
= 128;
83 err
= register_restart_handler(&ctx
->restart_handler
);
86 dev_err(dev
, "cannot register restart handler (err=%d)\n", 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
,
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
);