cregit-Linux how code gets into the kernel

Release 4.14 drivers/power/reset/xgene-reboot.c

/*
 * 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; }

Contributors

PersonTokensPropCommitsCommitProp
Loc Ho3860.32%125.00%
Guenter Roeck2438.10%250.00%
Mark Brown11.59%125.00%
Total63100.00%4100.00%


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) { iounmap(ctx->csr); dev_err(dev, "cannot register restart handler (err=%d)\n", err); } return err; }

Contributors

PersonTokensPropCommitsCommitProp
Loc Ho10362.42%120.00%
Guenter Roeck5332.12%360.00%
Arvind Yadav95.45%120.00%
Total165100.00%5100.00%

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); }

Contributors

PersonTokensPropCommitsCommitProp
Loc Ho16100.00%1100.00%
Total16100.00%1100.00%

device_initcall(xgene_reboot_init);

Overall Contributors

PersonTokensPropCommitsCommitProp
Loc Ho24069.97%112.50%
Guenter Roeck9226.82%450.00%
Arvind Yadav92.62%112.50%
Mark Brown10.29%112.50%
Fabian Frederick10.29%112.50%
Total343100.00%8100.00%
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