openwrtv4/target/linux/lantiq/patches-3.2/0061-MIPS-cleanup-reset-code.patch

From 5e04db198bbad2dc345262e838965332826eb37c Mon Sep 17 00:00:00 2001
From: John Crispin <blogic@openwrt.org>
Date: Fri, 16 Mar 2012 15:49:32 +0100
Subject: [PATCH 61/73] 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();
 }