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authorDaniel Baumann <daniel.baumann@progress-linux.org>2024-04-07 18:49:45 +0000
committerDaniel Baumann <daniel.baumann@progress-linux.org>2024-04-07 18:49:45 +0000
commit2c3c1048746a4622d8c89a29670120dc8fab93c4 (patch)
tree848558de17fb3008cdf4d861b01ac7781903ce39 /drivers/power/reset/xgene-reboot.c
parentInitial commit. (diff)
downloadlinux-2c3c1048746a4622d8c89a29670120dc8fab93c4.tar.xz
linux-2c3c1048746a4622d8c89a29670120dc8fab93c4.zip
Adding upstream version 6.1.76.upstream/6.1.76upstream
Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
Diffstat (limited to '')
-rw-r--r--drivers/power/reset/xgene-reboot.c95
1 files changed, 95 insertions, 0 deletions
diff --git a/drivers/power/reset/xgene-reboot.c b/drivers/power/reset/xgene-reboot.c
new file mode 100644
index 000000000..0b0d2fd2b
--- /dev/null
+++ b/drivers/power/reset/xgene-reboot.c
@@ -0,0 +1,95 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
+/*
+ * 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 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;
+}
+
+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;
+}
+
+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);
+}
+device_initcall(xgene_reboot_init);