104 lines
2.7 KiB
C
104 lines
2.7 KiB
C
/*
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* AppliedMicro X-Gene SoC Reboot Driver
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*
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* Copyright (c) 2013, Applied Micro Circuits Corporation
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* Author: Feng Kan <fkan@apm.com>
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* Author: Loc Ho <lho@apm.com>
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License as
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* published by the Free Software Foundation; either version 2 of
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* the License, or (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston,
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* MA 02111-1307 USA
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*
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* This driver provides system reboot functionality for APM X-Gene SoC.
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* For system shutdown, this is board specify. If a board designer
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* implements GPIO shutdown, use the gpio-poweroff.c driver.
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*/
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#include <linux/io.h>
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#include <linux/of_device.h>
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#include <linux/of_address.h>
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#include <linux/platform_device.h>
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#include <linux/stat.h>
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#include <linux/slab.h>
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#include <asm/system_misc.h>
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struct xgene_reboot_context {
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struct platform_device *pdev;
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void *csr;
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u32 mask;
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};
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static struct xgene_reboot_context *xgene_restart_ctx;
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static void xgene_restart(enum reboot_mode mode, const char *cmd)
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{
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struct xgene_reboot_context *ctx = xgene_restart_ctx;
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unsigned long timeout;
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/* Issue the reboot */
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if (ctx)
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writel(ctx->mask, ctx->csr);
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timeout = jiffies + HZ;
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while (time_before(jiffies, timeout))
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cpu_relax();
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dev_emerg(&ctx->pdev->dev, "Unable to restart system\n");
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}
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static int xgene_reboot_probe(struct platform_device *pdev)
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{
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struct xgene_reboot_context *ctx;
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ctx = devm_kzalloc(&pdev->dev, sizeof(*ctx), GFP_KERNEL);
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if (!ctx) {
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dev_err(&pdev->dev, "out of memory for context\n");
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return -ENODEV;
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}
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ctx->csr = of_iomap(pdev->dev.of_node, 0);
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if (!ctx->csr) {
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devm_kfree(&pdev->dev, ctx);
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dev_err(&pdev->dev, "can not map resource\n");
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return -ENODEV;
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}
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if (of_property_read_u32(pdev->dev.of_node, "mask", &ctx->mask))
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ctx->mask = 0xFFFFFFFF;
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ctx->pdev = pdev;
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arm_pm_restart = xgene_restart;
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xgene_restart_ctx = ctx;
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return 0;
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}
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static struct of_device_id xgene_reboot_of_match[] = {
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{ .compatible = "apm,xgene-reboot" },
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{}
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};
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static struct platform_driver xgene_reboot_driver = {
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.probe = xgene_reboot_probe,
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.driver = {
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.name = "xgene-reboot",
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.of_match_table = xgene_reboot_of_match,
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},
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};
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static int __init xgene_reboot_init(void)
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{
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return platform_driver_register(&xgene_reboot_driver);
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}
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device_initcall(xgene_reboot_init);
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