Add the rt linux 4.1.3-rt3 as base

[kvmfornfv.git] / kernel / drivers / power / reset / brcmstb-reboot.c

diff --git a/kernel/drivers/power/reset/brcmstb-reboot.c b/kernel/drivers/power/reset/brcmstb-reboot.c
new file mode 100644 (file)
index 0000000..884b53c
--- /dev/null
+++ b/kernel/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);