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From 0cc20912b376305452cdc5c8e7b97e156ba90e93 Mon Sep 17 00:00:00 2001
From: John Crispin <blogic@openwrt.org>
Date: Wed, 8 May 2013 22:08:39 +0200
Subject: [PATCH 28/33] reset: MIPS: ralink: add core/device reset wrapper
Add a helper for reseting different devices ont he SoC.
Signed-off-by: John Crispin <blogic@openwrt.org>
---
arch/mips/Kconfig | 1 +
arch/mips/ralink/of.c | 59 ++++++++++++++++++++++++++++++++++++++++++++++
arch/mips/ralink/reset.c | 1 +
3 files changed, 61 insertions(+)
--- a/arch/mips/Kconfig
+++ b/arch/mips/Kconfig
@@ -444,6 +444,7 @@ config RALINK
select HAVE_MACH_CLKDEV
select CLKDEV_LOOKUP
select ARCH_REQUIRE_GPIOLIB
+ select ARCH_HAS_RESET_CONTROLLER
config SGI_IP22
bool "SGI IP22 (Indy/Indigo2)"
--- a/arch/mips/ralink/of.c
+++ b/arch/mips/ralink/of.c
@@ -14,16 +14,22 @@
#include <linux/sizes.h>
#include <linux/of_fdt.h>
#include <linux/kernel.h>
+#include <linux/module.h>
#include <linux/bootmem.h>
#include <linux/of_platform.h>
#include <linux/of_address.h>
+#include <linux/reset-controller.h>
#include <asm/reboot.h>
#include <asm/bootinfo.h>
#include <asm/addrspace.h>
+#include <asm/mach-ralink/ralink_regs.h>
+
#include "common.h"
+#define SYSC_REG_RESET_CTRL 0x034
+
__iomem void *rt_sysc_membase;
__iomem void *rt_memc_membase;
@@ -96,6 +102,53 @@ void __init plat_mem_setup(void)
soc_info.mem_size_max * SZ_1M);
}
+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,
+};
+
static int __init plat_of_setup(void)
{
static struct of_device_id of_ids[3];
@@ -110,6 +163,12 @@ static int __init plat_of_setup(void)
if (of_platform_populate(NULL, of_ids, NULL, NULL))
panic("failed to populate DT\n");
+ reset_dev.of_node = of_find_compatible_node(NULL, NULL, "ralink,rt2880-reset");
+ if (!reset_dev.of_node)
+ panic("Failed to find reset controller node");
+
+ reset_controller_register(&reset_dev);
+
ralink_pinmux();
return 0;
--- a/arch/mips/ralink/reset.c
+++ b/arch/mips/ralink/reset.c
@@ -10,6 +10,7 @@
#include <linux/pm.h>
#include <linux/io.h>
+#include <linux/module.h>
#include <asm/reboot.h>
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