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90 lines
2.1 KiB
90 lines
2.1 KiB
From 223f1c46e109a8420765aee099a5d1dc4ab7ee98 Mon Sep 17 00:00:00 2001
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From: John Crispin <blogic@openwrt.org>
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Date: Tue, 3 Sep 2013 13:18:12 +0200
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Subject: [PATCH 05/36] MIPS: lantiq: add reset-controller api support
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Add a reset-controller binding for the reset registers found on the lantiq
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SoC.
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Signed-off-by: John Crispin <blogic@openwrt.org>
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---
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arch/mips/lantiq/xway/reset.c | 61 +++++++++++++++++++++++++++++++++++++++++
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1 file changed, 61 insertions(+)
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--- a/arch/mips/lantiq/xway/reset.c
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+++ b/arch/mips/lantiq/xway/reset.c
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@@ -14,6 +14,7 @@
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#include <linux/delay.h>
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#include <linux/of_address.h>
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#include <linux/of_platform.h>
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+#include <linux/reset-controller.h>
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#include <asm/reboot.h>
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@@ -113,6 +114,66 @@ void ltq_reset_once(unsigned int module,
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ltq_rcu_w32(ltq_rcu_r32(RCU_RST_REQ) & ~module, RCU_RST_REQ);
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}
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+static int ltq_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 = ltq_rcu_r32(RCU_RST_REQ);
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+ val |= BIT(id);
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+ ltq_rcu_w32(val, RCU_RST_REQ);
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+
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+ return 0;
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+}
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+
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+static int ltq_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 = ltq_rcu_r32(RCU_RST_REQ);
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+ val &= ~BIT(id);
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+ ltq_rcu_w32(val, RCU_RST_REQ);
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+
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+ return 0;
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+}
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+
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+static int ltq_reset_device(struct reset_controller_dev *rcdev,
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+ unsigned long id)
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+{
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+ ltq_assert_device(rcdev, id);
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+ return ltq_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 = ltq_reset_device,
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+ .assert = ltq_assert_device,
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+ .deassert = ltq_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 ltq_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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+ "lantiq,xway-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 ltq_machine_restart(char *command)
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{
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local_irq_disable();
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