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1a59d1b8 | 1 | // SPDX-License-Identifier: GPL-2.0-or-later |
67778e0e LH |
2 | /* |
3 | * AppliedMicro X-Gene SoC Reboot Driver | |
4 | * | |
5 | * Copyright (c) 2013, Applied Micro Circuits Corporation | |
6 | * Author: Feng Kan <fkan@apm.com> | |
7 | * Author: Loc Ho <lho@apm.com> | |
8 | * | |
67778e0e LH |
9 | * This driver provides system reboot functionality for APM X-Gene SoC. |
10 | * For system shutdown, this is board specify. If a board designer | |
11 | * implements GPIO shutdown, use the gpio-poweroff.c driver. | |
12 | */ | |
745e1976 | 13 | #include <linux/delay.h> |
67778e0e | 14 | #include <linux/io.h> |
8f57f231 | 15 | #include <linux/notifier.h> |
67778e0e LH |
16 | #include <linux/of_device.h> |
17 | #include <linux/of_address.h> | |
18 | #include <linux/platform_device.h> | |
8f57f231 | 19 | #include <linux/reboot.h> |
67778e0e LH |
20 | #include <linux/stat.h> |
21 | #include <linux/slab.h> | |
67778e0e LH |
22 | |
23 | struct xgene_reboot_context { | |
43160718 | 24 | struct device *dev; |
67778e0e LH |
25 | void *csr; |
26 | u32 mask; | |
8f57f231 | 27 | struct notifier_block restart_handler; |
67778e0e LH |
28 | }; |
29 | ||
8f57f231 GR |
30 | static int xgene_restart_handler(struct notifier_block *this, |
31 | unsigned long mode, void *cmd) | |
67778e0e | 32 | { |
8f57f231 GR |
33 | struct xgene_reboot_context *ctx = |
34 | container_of(this, struct xgene_reboot_context, | |
35 | restart_handler); | |
67778e0e LH |
36 | |
37 | /* Issue the reboot */ | |
8f57f231 | 38 | writel(ctx->mask, ctx->csr); |
67778e0e | 39 | |
745e1976 | 40 | mdelay(1000); |
67778e0e | 41 | |
43160718 | 42 | dev_emerg(ctx->dev, "Unable to restart system\n"); |
8f57f231 GR |
43 | |
44 | return NOTIFY_DONE; | |
67778e0e LH |
45 | } |
46 | ||
47 | static int xgene_reboot_probe(struct platform_device *pdev) | |
48 | { | |
49 | struct xgene_reboot_context *ctx; | |
43160718 | 50 | struct device *dev = &pdev->dev; |
8f57f231 | 51 | int err; |
67778e0e | 52 | |
43160718 | 53 | ctx = devm_kzalloc(dev, sizeof(*ctx), GFP_KERNEL); |
ef288f9f GR |
54 | if (!ctx) |
55 | return -ENOMEM; | |
67778e0e | 56 | |
43160718 | 57 | ctx->csr = of_iomap(dev->of_node, 0); |
67778e0e | 58 | if (!ctx->csr) { |
43160718 | 59 | dev_err(dev, "can not map resource\n"); |
67778e0e LH |
60 | return -ENODEV; |
61 | } | |
62 | ||
43160718 | 63 | if (of_property_read_u32(dev->of_node, "mask", &ctx->mask)) |
67778e0e LH |
64 | ctx->mask = 0xFFFFFFFF; |
65 | ||
43160718 | 66 | ctx->dev = dev; |
8f57f231 GR |
67 | ctx->restart_handler.notifier_call = xgene_restart_handler; |
68 | ctx->restart_handler.priority = 128; | |
69 | err = register_restart_handler(&ctx->restart_handler); | |
896af83e AY |
70 | if (err) { |
71 | iounmap(ctx->csr); | |
8f57f231 | 72 | dev_err(dev, "cannot register restart handler (err=%d)\n", err); |
896af83e | 73 | } |
67778e0e | 74 | |
8f57f231 | 75 | return err; |
67778e0e LH |
76 | } |
77 | ||
8fb08855 | 78 | static const struct of_device_id xgene_reboot_of_match[] = { |
67778e0e LH |
79 | { .compatible = "apm,xgene-reboot" }, |
80 | {} | |
81 | }; | |
82 | ||
83 | static struct platform_driver xgene_reboot_driver = { | |
84 | .probe = xgene_reboot_probe, | |
85 | .driver = { | |
86 | .name = "xgene-reboot", | |
87 | .of_match_table = xgene_reboot_of_match, | |
88 | }, | |
89 | }; | |
90 | ||
91 | static int __init xgene_reboot_init(void) | |
92 | { | |
93 | return platform_driver_register(&xgene_reboot_driver); | |
94 | } | |
95 | device_initcall(xgene_reboot_init); |