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Linux/drivers/power/reset/xgene-reboot.c

  1 /*
  2  * AppliedMicro X-Gene SoC Reboot Driver
  3  *
  4  * Copyright (c) 2013, Applied Micro Circuits Corporation
  5  * Author: Feng Kan <fkan@apm.com>
  6  * Author: Loc Ho <lho@apm.com>
  7  *
  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.
 12  *
 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.
 17  *
 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
 22  *
 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.
 26  */
 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>
 36 
 37 struct xgene_reboot_context {
 38         struct device *dev;
 39         void *csr;
 40         u32 mask;
 41         struct notifier_block restart_handler;
 42 };
 43 
 44 static int xgene_restart_handler(struct notifier_block *this,
 45                                  unsigned long mode, void *cmd)
 46 {
 47         struct xgene_reboot_context *ctx =
 48                 container_of(this, struct xgene_reboot_context,
 49                              restart_handler);
 50 
 51         /* Issue the reboot */
 52         writel(ctx->mask, ctx->csr);
 53 
 54         mdelay(1000);
 55 
 56         dev_emerg(ctx->dev, "Unable to restart system\n");
 57 
 58         return NOTIFY_DONE;
 59 }
 60 
 61 static int xgene_reboot_probe(struct platform_device *pdev)
 62 {
 63         struct xgene_reboot_context *ctx;
 64         struct device *dev = &pdev->dev;
 65         int err;
 66 
 67         ctx = devm_kzalloc(dev, sizeof(*ctx), GFP_KERNEL);
 68         if (!ctx)
 69                 return -ENOMEM;
 70 
 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;
 75         }
 76 
 77         if (of_property_read_u32(dev->of_node, "mask", &ctx->mask))
 78                 ctx->mask = 0xFFFFFFFF;
 79 
 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                 dev_err(dev, "cannot register restart handler (err=%d)\n", err);
 86 
 87         return err;
 88 }
 89 
 90 static const struct of_device_id xgene_reboot_of_match[] = {
 91         { .compatible = "apm,xgene-reboot" },
 92         {}
 93 };
 94 
 95 static struct platform_driver xgene_reboot_driver = {
 96         .probe = xgene_reboot_probe,
 97         .driver = {
 98                 .name = "xgene-reboot",
 99                 .of_match_table = xgene_reboot_of_match,
100         },
101 };
102 
103 static int __init xgene_reboot_init(void)
104 {
105         return platform_driver_register(&xgene_reboot_driver);
106 }
107 device_initcall(xgene_reboot_init);
108 

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