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From 4e694014a11a407e309f62c7daade545ba71dcf1 Mon Sep 17 00:00:00 2001
From: John Crispin <blogic@openwrt.org>
Date: Sun, 28 Jul 2013 13:54:22 +0200
Subject: [PATCH 09/25] MIPS: ralink: add support for reset-controller API
Add a helper for reseting different devices on the SoC.
Signed-off-by: John Crispin <blogic@openwrt.org>
---
arch/mips/Kconfig | 1 +
arch/mips/ralink/common.h | 2 ++
arch/mips/ralink/of.c | 3 +++
arch/mips/ralink/reset.c | 62 +++++++++++++++++++++++++++++++++++++++++++++
4 files changed, 68 insertions(+)
--- a/arch/mips/Kconfig
+++ b/arch/mips/Kconfig
@@ -374,6 +374,7 @@ config MACH_VR41XX
select CSRC_R4K
select SYS_HAS_CPU_VR41XX
select ARCH_REQUIRE_GPIOLIB
+ select ARCH_HAS_RESET_CONTROLLER
config NXP_STB220
bool "NXP STB220 board"
--- a/arch/mips/ralink/common.h
+++ b/arch/mips/ralink/common.h
@@ -46,6 +46,8 @@ extern void ralink_of_remap(void);
extern void ralink_clk_init(void);
extern void ralink_clk_add(const char *dev, unsigned long rate);
+extern void ralink_rst_init(void);
+
extern void prom_soc_init(struct ralink_soc_info *soc_info);
__iomem void *plat_of_remap_node(const char *node);
--- a/arch/mips/ralink/of.c
+++ b/arch/mips/ralink/of.c
@@ -110,6 +110,9 @@ static int __init plat_of_setup(void)
if (of_platform_populate(NULL, of_ids, NULL, NULL))
panic("failed to populate DT\n");
+ /* make sure ithat the reset controller is setup early */
+ ralink_rst_init();
+
return 0;
}
--- a/arch/mips/ralink/reset.c
+++ b/arch/mips/ralink/reset.c
@@ -10,6 +10,8 @@
#include <linux/pm.h>
#include <linux/io.h>
+#include <linux/of.h>
+#include <linux/reset-controller.h>
#include <asm/reboot.h>
@@ -19,6 +21,66 @@
#define SYSC_REG_RESET_CTRL 0x034
#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 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)
{
local_irq_disable();
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