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From 1748dc7b4974109040d0249ac1fc322c120eb528 Mon Sep 17 00:00:00 2001
From: John Crispin <blogic@openwrt.org>
Date: Fri, 16 Mar 2012 15:49:32 +0100
Subject: [PATCH 62/70] MIPS: cleanup reset code
---
arch/mips/lantiq/xway/reset.c | 59 ++++++++++++++++++++++++++++++++++------
1 files changed, 50 insertions(+), 9 deletions(-)
--- a/arch/mips/lantiq/xway/reset.c
+++ b/arch/mips/lantiq/xway/reset.c
@@ -11,6 +11,7 @@
#include <linux/ioport.h>
#include <linux/pm.h>
#include <linux/export.h>
+#include <linux/delay.h>
#include <asm/reboot.h>
#include <lantiq_soc.h>
@@ -20,12 +21,45 @@
#define ltq_rcu_w32(x, y) ltq_w32((x), ltq_rcu_membase + (y))
#define ltq_rcu_r32(x) ltq_r32(ltq_rcu_membase + (x))
-/* register definitions */
-#define LTQ_RCU_RST 0x0010
-#define LTQ_RCU_RST_ALL 0x40000000
-
-#define LTQ_RCU_RST_STAT 0x0014
-#define LTQ_RCU_STAT_SHIFT 26
+/* reset request register */
+#define RCU_RST_REQ 0x0010
+/* reset status register */
+#define RCU_RST_STAT 0x0014
+
+/* reset cause */
+#define RCU_STAT_SHIFT 26
+/* Global SW Reset */
+#define RCU_RD_SRST BIT(30)
+/* Memory Controller */
+#define RCU_RD_MC BIT(14)
+/* PCI core */
+#define RCU_RD_PCI BIT(13)
+/* Voice DFE/AFE */
+#define RCU_RD_DFE_AFE BIT(12)
+/* DSL AFE */
+#define RCU_RD_DSL_AFE BIT(11)
+/* SDIO core */
+#define RCU_RD_SDIO BIT(10)
+/* DMA core */
+#define RCU_RD_DMA BIT(9)
+/* PPE core */
+#define RCU_RD_PPE BIT(8)
+/* ARC/DFE core */
+#define RCU_RD_ARC_DFE BIT(7)
+/* AHB bus */
+#define RCU_RD_AHB BIT(6)
+/* Ethernet MAC1 */
+#define RCU_RD_ENET_MAC1 BIT(5)
+/* USB and Phy core */
+#define RCU_RD_USB BIT(4)
+/* CPU1 subsystem */
+#define RCU_RD_CPU1 BIT(3)
+/* FPI bus */
+#define RCU_RD_FPI BIT(2)
+/* CPU0 subsystem */
+#define RCU_RD_CPU0 BIT(1)
+/* HW reset via HRST pin */
+#define RCU_RD_HRST BIT(0)
static struct resource ltq_rcu_resource =
MEM_RES("rcu", LTQ_RCU_BASE_ADDR, LTQ_RCU_SIZE);
@@ -36,16 +70,23 @@ static void __iomem *ltq_rcu_membase;
/* This function is used by the watchdog driver */
int ltq_reset_cause(void)
{
- u32 val = ltq_rcu_r32(LTQ_RCU_RST_STAT);
- return val >> LTQ_RCU_STAT_SHIFT;
+ u32 val = ltq_rcu_r32(RCU_RST_STAT);
+ return val >> RCU_STAT_SHIFT;
}
EXPORT_SYMBOL_GPL(ltq_reset_cause);
+void ltq_reset_once(unsigned int module, ulong usec)
+{
+ ltq_rcu_w32(ltq_rcu_r32(RCU_RST_REQ) | module, RCU_RST_REQ);
+ udelay(usec);
+ ltq_rcu_w32(ltq_rcu_r32(RCU_RST_REQ) & ~module, RCU_RST_REQ);
+}
+
static void ltq_machine_restart(char *command)
{
pr_notice("System restart\n");
local_irq_disable();
- ltq_rcu_w32(ltq_rcu_r32(LTQ_RCU_RST) | LTQ_RCU_RST_ALL, LTQ_RCU_RST);
+ ltq_rcu_w32(ltq_rcu_r32(RCU_RST_REQ) | RCU_RD_SRST, RCU_RST_REQ);
unreachable();
}
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