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authorDaniel Baumann <daniel.baumann@progress-linux.org>2024-04-11 08:27:49 +0000
committerDaniel Baumann <daniel.baumann@progress-linux.org>2024-04-11 08:27:49 +0000
commitace9429bb58fd418f0c81d4c2835699bddf6bde6 (patch)
treeb2d64bc10158fdd5497876388cd68142ca374ed3 /drivers/power/reset/rmobile-reset.c
parentInitial commit. (diff)
downloadlinux-ace9429bb58fd418f0c81d4c2835699bddf6bde6.tar.xz
linux-ace9429bb58fd418f0c81d4c2835699bddf6bde6.zip
Adding upstream version 6.6.15.upstream/6.6.15
Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
Diffstat (limited to 'drivers/power/reset/rmobile-reset.c')
-rw-r--r--drivers/power/reset/rmobile-reset.c88
1 files changed, 88 insertions, 0 deletions
diff --git a/drivers/power/reset/rmobile-reset.c b/drivers/power/reset/rmobile-reset.c
new file mode 100644
index 0000000000..bd3b396558
--- /dev/null
+++ b/drivers/power/reset/rmobile-reset.c
@@ -0,0 +1,88 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * Renesas R-Mobile Reset Driver
+ *
+ * Copyright (C) 2014 Glider bvba
+ */
+
+#include <linux/io.h>
+#include <linux/module.h>
+#include <linux/notifier.h>
+#include <linux/of_address.h>
+#include <linux/platform_device.h>
+#include <linux/printk.h>
+#include <linux/reboot.h>
+
+/* SYSC Register Bank 2 */
+#define RESCNT2 0x20 /* Reset Control Register 2 */
+
+/* Reset Control Register 2 */
+#define RESCNT2_PRES 0x80000000 /* Soft power-on reset */
+
+static void __iomem *sysc_base2;
+
+static int rmobile_reset_handler(struct notifier_block *this,
+ unsigned long mode, void *cmd)
+{
+ pr_debug("%s %lu\n", __func__, mode);
+
+ /* Let's assume we have acquired the HPB semaphore */
+ writel(RESCNT2_PRES, sysc_base2 + RESCNT2);
+
+ return NOTIFY_DONE;
+}
+
+static struct notifier_block rmobile_reset_nb = {
+ .notifier_call = rmobile_reset_handler,
+ .priority = 192,
+};
+
+static int rmobile_reset_probe(struct platform_device *pdev)
+{
+ int error;
+
+ sysc_base2 = of_iomap(pdev->dev.of_node, 1);
+ if (!sysc_base2)
+ return -ENODEV;
+
+ error = register_restart_handler(&rmobile_reset_nb);
+ if (error) {
+ dev_err(&pdev->dev,
+ "cannot register restart handler (err=%d)\n", error);
+ goto fail_unmap;
+ }
+
+ return 0;
+
+fail_unmap:
+ iounmap(sysc_base2);
+ return error;
+}
+
+static int rmobile_reset_remove(struct platform_device *pdev)
+{
+ unregister_restart_handler(&rmobile_reset_nb);
+ iounmap(sysc_base2);
+ return 0;
+}
+
+static const struct of_device_id rmobile_reset_of_match[] = {
+ { .compatible = "renesas,sysc-rmobile", },
+ { /* sentinel */ }
+};
+MODULE_DEVICE_TABLE(of, rmobile_reset_of_match);
+
+static struct platform_driver rmobile_reset_driver = {
+ .probe = rmobile_reset_probe,
+ .remove = rmobile_reset_remove,
+ .driver = {
+ .name = "rmobile_reset",
+ .of_match_table = rmobile_reset_of_match,
+ },
+};
+
+module_platform_driver(rmobile_reset_driver);
+
+MODULE_DESCRIPTION("Renesas R-Mobile Reset Driver");
+MODULE_AUTHOR("Geert Uytterhoeven <geert+renesas@glider.be>");
+MODULE_LICENSE("GPL v2");