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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/io.h>
 28 #include <linux/of_device.h>
 29 #include <linux/of_address.h>
 30 #include <linux/platform_device.h>
 31 #include <linux/stat.h>
 32 #include <linux/slab.h>
 33 #include <asm/system_misc.h>
 34 
 35 struct xgene_reboot_context {
 36         struct platform_device *pdev;
 37         void *csr;
 38         u32 mask;
 39 };
 40 
 41 static struct xgene_reboot_context *xgene_restart_ctx;
 42 
 43 static void xgene_restart(char str, const char *cmd)
 44 {
 45         struct xgene_reboot_context *ctx = xgene_restart_ctx;
 46         unsigned long timeout;
 47 
 48         /* Issue the reboot */
 49         if (ctx)
 50                 writel(ctx->mask, ctx->csr);
 51 
 52         timeout = jiffies + HZ;
 53         while (time_before(jiffies, timeout))
 54                 cpu_relax();
 55 
 56         dev_emerg(&ctx->pdev->dev, "Unable to restart system\n");
 57 }
 58 
 59 static int xgene_reboot_probe(struct platform_device *pdev)
 60 {
 61         struct xgene_reboot_context *ctx;
 62 
 63         ctx = devm_kzalloc(&pdev->dev, sizeof(*ctx), GFP_KERNEL);
 64         if (!ctx) {
 65                 dev_err(&pdev->dev, "out of memory for context\n");
 66                 return -ENODEV;
 67         }
 68 
 69         ctx->csr = of_iomap(pdev->dev.of_node, 0);
 70         if (!ctx->csr) {
 71                 devm_kfree(&pdev->dev, ctx);
 72                 dev_err(&pdev->dev, "can not map resource\n");
 73                 return -ENODEV;
 74         }
 75 
 76         if (of_property_read_u32(pdev->dev.of_node, "mask", &ctx->mask))
 77                 ctx->mask = 0xFFFFFFFF;
 78 
 79         ctx->pdev = pdev;
 80         arm_pm_restart = xgene_restart;
 81         xgene_restart_ctx = ctx;
 82 
 83         return 0;
 84 }
 85 
 86 static struct of_device_id xgene_reboot_of_match[] = {
 87         { .compatible = "apm,xgene-reboot" },
 88         {}
 89 };
 90 
 91 static struct platform_driver xgene_reboot_driver = {
 92         .probe = xgene_reboot_probe,
 93         .driver = {
 94                 .name = "xgene-reboot",
 95                 .of_match_table = xgene_reboot_of_match,
 96         },
 97 };
 98 
 99 static int __init xgene_reboot_init(void)
100 {
101         return platform_driver_register(&xgene_reboot_driver);
102 }
103 device_initcall(xgene_reboot_init);
104 

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