136 lines
3.3 KiB
Diff
136 lines
3.3 KiB
Diff
From 0cc20912b376305452cdc5c8e7b97e156ba90e93 Mon Sep 17 00:00:00 2001
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From: John Crispin <blogic@openwrt.org>
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Date: Wed, 8 May 2013 22:08:39 +0200
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Subject: [PATCH 28/33] reset: MIPS: ralink: add core/device reset wrapper
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Add a helper for reseting different devices ont he SoC.
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Signed-off-by: John Crispin <blogic@openwrt.org>
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---
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arch/mips/Kconfig | 1 +
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arch/mips/ralink/of.c | 59 ++++++++++++++++++++++++++++++++++++++++++++++
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arch/mips/ralink/reset.c | 1 +
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3 files changed, 61 insertions(+)
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diff --git a/arch/mips/Kconfig b/arch/mips/Kconfig
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index 5737c4b..8258e8e 100644
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--- a/arch/mips/Kconfig
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+++ b/arch/mips/Kconfig
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@@ -444,6 +444,7 @@ config RALINK
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select HAVE_MACH_CLKDEV
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select CLKDEV_LOOKUP
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select ARCH_REQUIRE_GPIOLIB
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+ select ARCH_HAS_RESET_CONTROLLER
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config SGI_IP22
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bool "SGI IP22 (Indy/Indigo2)"
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diff --git a/arch/mips/ralink/of.c b/arch/mips/ralink/of.c
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index 8efb02b..2faf478 100644
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--- a/arch/mips/ralink/of.c
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+++ b/arch/mips/ralink/of.c
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@@ -14,16 +14,22 @@
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#include <linux/sizes.h>
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#include <linux/of_fdt.h>
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#include <linux/kernel.h>
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+#include <linux/module.h>
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#include <linux/bootmem.h>
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#include <linux/of_platform.h>
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#include <linux/of_address.h>
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+#include <linux/reset-controller.h>
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#include <asm/reboot.h>
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#include <asm/bootinfo.h>
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#include <asm/addrspace.h>
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+#include <asm/mach-ralink/ralink_regs.h>
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+
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#include "common.h"
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+#define SYSC_REG_RESET_CTRL 0x034
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+
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__iomem void *rt_sysc_membase;
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__iomem void *rt_memc_membase;
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@@ -96,6 +102,53 @@ void __init plat_mem_setup(void)
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soc_info.mem_size_max * SZ_1M);
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}
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+static int ralink_assert_device(struct reset_controller_dev *rcdev, unsigned long id)
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+{
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+ u32 val;
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+
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+ if (id < 8)
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+ return -1;
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+
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+ val = rt_sysc_r32(SYSC_REG_RESET_CTRL);
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+ val |= BIT(id);
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+ rt_sysc_w32(val, SYSC_REG_RESET_CTRL);
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+
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+ return 0;
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+}
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+
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+static int ralink_deassert_device(struct reset_controller_dev *rcdev, unsigned long id)
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+{
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+ u32 val;
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+
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+ if (id < 8)
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+ return -1;
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+
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+ val = rt_sysc_r32(SYSC_REG_RESET_CTRL);
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+ val &= ~BIT(id);
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+ rt_sysc_w32(val, SYSC_REG_RESET_CTRL);
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+
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+ return 0;
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+}
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+
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+static int ralink_reset_device(struct reset_controller_dev *rcdev, unsigned long id)
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+{
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+ ralink_assert_device(rcdev, id);
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+ return ralink_deassert_device(rcdev, id);
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+}
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+
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+static struct reset_control_ops reset_ops = {
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+ .reset = ralink_reset_device,
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+ .assert = ralink_assert_device,
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+ .deassert = ralink_deassert_device,
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+};
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+
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+static struct reset_controller_dev reset_dev = {
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+ .ops = &reset_ops,
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+ .owner = THIS_MODULE,
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+ .nr_resets = 32,
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+ .of_reset_n_cells = 1,
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+};
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+
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static int __init plat_of_setup(void)
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{
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static struct of_device_id of_ids[3];
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@@ -110,6 +163,12 @@ static int __init plat_of_setup(void)
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if (of_platform_populate(NULL, of_ids, NULL, NULL))
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panic("failed to populate DT\n");
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+ reset_dev.of_node = of_find_compatible_node(NULL, NULL, "ralink,rt2880-reset");
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+ if (!reset_dev.of_node)
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+ panic("Failed to find reset controller node");
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+
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+ reset_controller_register(&reset_dev);
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+
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ralink_pinmux();
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return 0;
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diff --git a/arch/mips/ralink/reset.c b/arch/mips/ralink/reset.c
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index 22120e5..6c15f4f 100644
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--- a/arch/mips/ralink/reset.c
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+++ b/arch/mips/ralink/reset.c
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@@ -10,6 +10,7 @@
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#include <linux/pm.h>
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#include <linux/io.h>
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+#include <linux/module.h>
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#include <asm/reboot.h>
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--
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1.7.10.4
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