From 57f0f512b273f60d52568b8c6b77e17f5636edc0 Mon Sep 17 00:00:00 2001
From: André Fabian Silva Delgado <emulatorman@parabola.nu>
Date: Wed, 5 Aug 2015 17:04:01 -0300
Subject: Initial import

---
 drivers/power/reset/brcmstb-reboot.c | 156 +++++++++++++++++++++++++++++++++++
 1 file changed, 156 insertions(+)
 create mode 100644 drivers/power/reset/brcmstb-reboot.c

(limited to 'drivers/power/reset/brcmstb-reboot.c')

diff --git a/drivers/power/reset/brcmstb-reboot.c b/drivers/power/reset/brcmstb-reboot.c
new file mode 100644
index 000000000..884b53c48
--- /dev/null
+++ b/drivers/power/reset/brcmstb-reboot.c
@@ -0,0 +1,156 @@
+/*
+ * Copyright (C) 2013 Broadcom Corporation
+ *
+ * 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 version 2.
+ *
+ * This program is distributed "as is" WITHOUT ANY WARRANTY of any
+ * kind, whether express or implied; without even the implied warranty
+ * of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ */
+
+#include <linux/bitops.h>
+#include <linux/device.h>
+#include <linux/errno.h>
+#include <linux/init.h>
+#include <linux/io.h>
+#include <linux/jiffies.h>
+#include <linux/notifier.h>
+#include <linux/of_address.h>
+#include <linux/of_irq.h>
+#include <linux/of_platform.h>
+#include <linux/platform_device.h>
+#include <linux/printk.h>
+#include <linux/reboot.h>
+#include <linux/regmap.h>
+#include <linux/smp.h>
+#include <linux/mfd/syscon.h>
+
+#define RESET_SOURCE_ENABLE_REG 1
+#define SW_MASTER_RESET_REG 2
+
+static struct regmap *regmap;
+static u32 rst_src_en;
+static u32 sw_mstr_rst;
+
+struct reset_reg_mask {
+	u32 rst_src_en_mask;
+	u32 sw_mstr_rst_mask;
+};
+
+static const struct reset_reg_mask *reset_masks;
+
+static int brcmstb_restart_handler(struct notifier_block *this,
+				   unsigned long mode, void *cmd)
+{
+	int rc;
+	u32 tmp;
+
+	rc = regmap_write(regmap, rst_src_en, reset_masks->rst_src_en_mask);
+	if (rc) {
+		pr_err("failed to write rst_src_en (%d)\n", rc);
+		return NOTIFY_DONE;
+	}
+
+	rc = regmap_read(regmap, rst_src_en, &tmp);
+	if (rc) {
+		pr_err("failed to read rst_src_en (%d)\n", rc);
+		return NOTIFY_DONE;
+	}
+
+	rc = regmap_write(regmap, sw_mstr_rst, reset_masks->sw_mstr_rst_mask);
+	if (rc) {
+		pr_err("failed to write sw_mstr_rst (%d)\n", rc);
+		return NOTIFY_DONE;
+	}
+
+	rc = regmap_read(regmap, sw_mstr_rst, &tmp);
+	if (rc) {
+		pr_err("failed to read sw_mstr_rst (%d)\n", rc);
+		return NOTIFY_DONE;
+	}
+
+	while (1)
+		;
+
+	return NOTIFY_DONE;
+}
+
+static struct notifier_block brcmstb_restart_nb = {
+	.notifier_call = brcmstb_restart_handler,
+	.priority = 128,
+};
+
+static const struct reset_reg_mask reset_bits_40nm = {
+	.rst_src_en_mask = BIT(0),
+	.sw_mstr_rst_mask = BIT(0),
+};
+
+static const struct reset_reg_mask reset_bits_65nm = {
+	.rst_src_en_mask = BIT(3),
+	.sw_mstr_rst_mask = BIT(31),
+};
+
+static const struct of_device_id of_match[] = {
+	{ .compatible = "brcm,brcmstb-reboot", .data = &reset_bits_40nm },
+	{ .compatible = "brcm,bcm7038-reboot", .data = &reset_bits_65nm },
+	{},
+};
+
+static int brcmstb_reboot_probe(struct platform_device *pdev)
+{
+	int rc;
+	struct device_node *np = pdev->dev.of_node;
+	const struct of_device_id *of_id;
+
+	of_id = of_match_node(of_match, np);
+	if (!of_id) {
+		pr_err("failed to look up compatible string\n");
+		return -EINVAL;
+	}
+	reset_masks = of_id->data;
+
+	regmap = syscon_regmap_lookup_by_phandle(np, "syscon");
+	if (IS_ERR(regmap)) {
+		pr_err("failed to get syscon phandle\n");
+		return -EINVAL;
+	}
+
+	rc = of_property_read_u32_index(np, "syscon", RESET_SOURCE_ENABLE_REG,
+					&rst_src_en);
+	if (rc) {
+		pr_err("can't get rst_src_en offset (%d)\n", rc);
+		return -EINVAL;
+	}
+
+	rc = of_property_read_u32_index(np, "syscon", SW_MASTER_RESET_REG,
+					&sw_mstr_rst);
+	if (rc) {
+		pr_err("can't get sw_mstr_rst offset (%d)\n", rc);
+		return -EINVAL;
+	}
+
+	rc = register_restart_handler(&brcmstb_restart_nb);
+	if (rc)
+		dev_err(&pdev->dev,
+			"cannot register restart handler (err=%d)\n", rc);
+
+	return rc;
+}
+
+static struct platform_driver brcmstb_reboot_driver = {
+	.probe = brcmstb_reboot_probe,
+	.driver = {
+		.name = "brcmstb-reboot",
+		.of_match_table = of_match,
+	},
+};
+
+static int __init brcmstb_reboot_init(void)
+{
+	return platform_driver_probe(&brcmstb_reboot_driver,
+					brcmstb_reboot_probe);
+}
+subsys_initcall(brcmstb_reboot_init);
-- 
cgit v1.2.3-54-g00ecf