127 lines
3.1 KiB
Diff
127 lines
3.1 KiB
Diff
From 4e694014a11a407e309f62c7daade545ba71dcf1 Mon Sep 17 00:00:00 2001
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From: John Crispin <blogic@openwrt.org>
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Date: Sun, 28 Jul 2013 13:54:22 +0200
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Subject: [PATCH 09/25] MIPS: ralink: add support for reset-controller API
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Add a helper for reseting different devices on the 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/common.h | 2 ++
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arch/mips/ralink/of.c | 3 +++
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arch/mips/ralink/reset.c | 62 +++++++++++++++++++++++++++++++++++++++++++++
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4 files changed, 68 insertions(+)
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--- a/arch/mips/Kconfig
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+++ b/arch/mips/Kconfig
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@@ -374,6 +374,7 @@ config MACH_VR41XX
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select CSRC_R4K
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select SYS_HAS_CPU_VR41XX
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select ARCH_REQUIRE_GPIOLIB
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+ select ARCH_HAS_RESET_CONTROLLER
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config NXP_STB220
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bool "NXP STB220 board"
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--- a/arch/mips/ralink/common.h
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+++ b/arch/mips/ralink/common.h
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@@ -46,6 +46,8 @@ extern void ralink_of_remap(void);
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extern void ralink_clk_init(void);
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extern void ralink_clk_add(const char *dev, unsigned long rate);
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+extern void ralink_rst_init(void);
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+
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extern void prom_soc_init(struct ralink_soc_info *soc_info);
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__iomem void *plat_of_remap_node(const char *node);
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--- a/arch/mips/ralink/of.c
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+++ b/arch/mips/ralink/of.c
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@@ -110,6 +110,9 @@ 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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+ /* make sure ithat the reset controller is setup early */
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+ ralink_rst_init();
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+
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return 0;
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}
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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 +10,8 @@
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#include <linux/pm.h>
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#include <linux/io.h>
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+#include <linux/of.h>
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+#include <linux/reset-controller.h>
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#include <asm/reboot.h>
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@@ -19,6 +21,66 @@
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#define SYSC_REG_RESET_CTRL 0x034
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#define RSTCTL_RESET_SYSTEM BIT(0)
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+static int ralink_assert_device(struct reset_controller_dev *rcdev,
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+ 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,
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+ 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,
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+ 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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+void ralink_rst_init(void)
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+{
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+ reset_dev.of_node = of_find_compatible_node(NULL, NULL,
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+ "ralink,rt2880-reset");
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+ if (!reset_dev.of_node)
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+ pr_err("Failed to find reset controller node");
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+ else
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+ reset_controller_register(&reset_dev);
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+}
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+
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static void ralink_restart(char *command)
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{
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local_irq_disable();
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