1 files changed, 104 insertions, 0 deletions

diff --git a/arch/mips/ralink/reset.c b/arch/mips/ralink/reset.c
new file mode 100644
index 000000000..8126f1260
--- /dev/null
+++ b/arch/mips/ralink/reset.c
@@ -0,0 +1,104 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/*
+ *
+ * Copyright (C) 2008-2009 Gabor Juhos <juhosg@openwrt.org>
+ * Copyright (C) 2008 Imre Kaloz <kaloz@openwrt.org>
+ * Copyright (C) 2013 John Crispin <john@phrozen.org>
+ */
+
+#include <linux/pm.h>
+#include <linux/io.h>
+#include <linux/of.h>
+#include <linux/delay.h>
+#include <linux/reset-controller.h>
+
+#include <asm/reboot.h>
+
+#include <asm/mach-ralink/ralink_regs.h>
+
+/* Reset Control */
+#define SYSC_REG_RESET_CTRL     0x034
+
+#define RSTCTL_RESET_PCI        BIT(26)
+#define RSTCTL_RESET_SYSTEM     BIT(0)
+
+static int ralink_assert_device(struct reset_controller_dev *rcdev,
+                                unsigned long id)
+{
+        u32 val;
+
+        if (id < 8)
+                return -1;
+
+        val = rt_sysc_r32(SYSC_REG_RESET_CTRL);
+        val |= BIT(id);
+        rt_sysc_w32(val, SYSC_REG_RESET_CTRL);
+
+        return 0;
+}
+
+static int ralink_deassert_device(struct reset_controller_dev *rcdev,
+                                  unsigned long id)
+{
+        u32 val;
+
+        if (id < 8)
+                return -1;
+
+        val = rt_sysc_r32(SYSC_REG_RESET_CTRL);
+        val &= ~BIT(id);
+        rt_sysc_w32(val, SYSC_REG_RESET_CTRL);
+
+        return 0;
+}
+
+static int ralink_reset_device(struct reset_controller_dev *rcdev,
+                               unsigned long id)
+{
+        ralink_assert_device(rcdev, id);
+        return ralink_deassert_device(rcdev, id);
+}
+
+static const struct reset_control_ops reset_ops = {
+        .reset = ralink_reset_device,
+        .assert = ralink_assert_device,
+        .deassert = ralink_deassert_device,
+};
+
+static struct reset_controller_dev reset_dev = {
+        .ops                    = &reset_ops,
+        .owner                  = THIS_MODULE,
+        .nr_resets              = 32,
+        .of_reset_n_cells       = 1,
+};
+
+void ralink_rst_init(void)
+{
+        reset_dev.of_node = of_find_compatible_node(NULL, NULL,
+                                                "ralink,rt2880-reset");
+        if (!reset_dev.of_node)
+                pr_err("Failed to find reset controller node");
+        else
+                reset_controller_register(&reset_dev);
+}
+
+static void ralink_restart(char *command)
+{
+        if (IS_ENABLED(CONFIG_PCI)) {
+                rt_sysc_m32(0, RSTCTL_RESET_PCI, SYSC_REG_RESET_CTRL);
+                mdelay(50);
+        }
+
+        local_irq_disable();
+        rt_sysc_w32(RSTCTL_RESET_SYSTEM, SYSC_REG_RESET_CTRL);
+        unreachable();
+}
+
+static int __init mips_reboot_setup(void)
+{
+        _machine_restart = ralink_restart;
+
+        return 0;
+}
+
+arch_initcall(mips_reboot_setup);