ar71xx: add initial support for 3.2

Tested on the following boards:
  ALFA AP96
  TL-MR3220 v1
  TL-WR1043ND v1
  TL-WR2543ND v1
  TL-WR703N v1
  TL-WR741ND v1
  TL-WR741ND v4
  WNDR3700 v1
  WZR-HP-G300NH

SVN-Revision: 29868

1 files changed, 154 insertions, 0 deletions

diff --git a/target/linux/ar71xx/patches-3.2/126-MIPS-ath79-rework-IP2-IP3-interrupt-handling.patch b/target/linux/ar71xx/patches-3.2/126-MIPS-ath79-rework-IP2-IP3-interrupt-handling.patch
new file mode 100644
index 0000000000..144acacf4a
--- /dev/null
+++ b/target/linux/ar71xx/patches-3.2/126-MIPS-ath79-rework-IP2-IP3-interrupt-handling.patch
@@ -0,0 +1,154 @@
+From e69d89040d4884ea4069352338f555694e65fe70 Mon Sep 17 00:00:00 2001
+From: Gabor Juhos <juhosg@openwrt.org>
+Date: Fri, 9 Dec 2011 21:30:03 +0100
+Subject: [PATCH 26/35] MIPS: ath79: rework IP2/IP3 interrupt handling
+
+The current implementation assumes that flushing the
+DDR writeback buffer is required for IP2/IP3 interrupts,
+however this is not true for all SoCs.
+
+Use SoC specific IP2/IP3 handlers instead of flushing
+the buffers in the dispatcher code.
+
+Signed-off-by: Gabor Juhos <juhosg@openwrt.org>
+Acked-by: Luis R. Rodriguez <mcgrof@qca.qualcomm.com>
+---
+ arch/mips/ath79/irq.c |   92 ++++++++++++++++++++++++++++++++++++++-----------
+ 1 files changed, 72 insertions(+), 20 deletions(-)
+
+--- a/arch/mips/ath79/irq.c
++++ b/arch/mips/ath79/irq.c
+@@ -1,7 +1,7 @@
+ /*
+  *  Atheros AR71xx/AR724x/AR913x specific interrupt handling
+  *
+- *  Copyright (C) 2008-2010 Gabor Juhos <juhosg@openwrt.org>
++ *  Copyright (C) 2008-2011 Gabor Juhos <juhosg@openwrt.org>
+  *  Copyright (C) 2008 Imre Kaloz <kaloz@openwrt.org>
+  *
+  *  Parts of this file are based on Atheros' 2.6.15 BSP
+@@ -23,8 +23,8 @@
+ #include <asm/mach-ath79/ar71xx_regs.h>
+ #include "common.h"
+ 
+-static unsigned int ath79_ip2_flush_reg;
+-static unsigned int ath79_ip3_flush_reg;
++static void (*ath79_ip2_handler)(void);
++static void (*ath79_ip3_handler)(void);
+ 
+ static void ath79_misc_irq_handler(unsigned int irq, struct irq_desc *desc)
+ {
+@@ -152,10 +152,8 @@ asmlinkage void plat_irq_dispatch(void)
+ 	if (pending & STATUSF_IP7)
+ 		do_IRQ(ATH79_CPU_IRQ_TIMER);
+ 
+-	else if (pending & STATUSF_IP2) {
+-		ath79_ddr_wb_flush(ath79_ip2_flush_reg);
+-		do_IRQ(ATH79_CPU_IRQ_IP2);
+-	}
++	else if (pending & STATUSF_IP2)
++		ath79_ip2_handler();
+ 
+ 	else if (pending & STATUSF_IP4)
+ 		do_IRQ(ATH79_CPU_IRQ_GE0);
+@@ -163,10 +161,8 @@ asmlinkage void plat_irq_dispatch(void)
+ 	else if (pending & STATUSF_IP5)
+ 		do_IRQ(ATH79_CPU_IRQ_GE1);
+ 
+-	else if (pending & STATUSF_IP3) {
+-		ath79_ddr_wb_flush(ath79_ip3_flush_reg);
+-		do_IRQ(ATH79_CPU_IRQ_USB);
+-	}
++	else if (pending & STATUSF_IP3)
++		ath79_ip3_handler();
+ 
+ 	else if (pending & STATUSF_IP6)
+ 		do_IRQ(ATH79_CPU_IRQ_MISC);
+@@ -175,22 +171,78 @@ asmlinkage void plat_irq_dispatch(void)
+ 		spurious_interrupt();
+ }
+ 
++/*
++ * The IP2/IP3 lines are tied to a PCI/WMAC/USB device. Drivers for
++ * these devices typically allocate coherent DMA memory, however the
++ * DMA controller may still have some unsynchronized data in the FIFO.
++ * Issue a flush in the handlers to ensure that the driver sees
++ * the update.
++ */
++static void ar71xx_ip2_handler(void)
++{
++	ath79_ddr_wb_flush(AR71XX_DDR_REG_FLUSH_PCI);
++	do_IRQ(ATH79_CPU_IRQ_IP2);
++}
++
++static void ar724x_ip2_handler(void)
++{
++	ath79_ddr_wb_flush(AR724X_DDR_REG_FLUSH_PCIE);
++	do_IRQ(ATH79_CPU_IRQ_IP2);
++}
++
++static void ar913x_ip2_handler(void)
++{
++	ath79_ddr_wb_flush(AR913X_DDR_REG_FLUSH_WMAC);
++	do_IRQ(ATH79_CPU_IRQ_IP2);
++}
++
++static void ar933x_ip2_handler(void)
++{
++	ath79_ddr_wb_flush(AR933X_DDR_REG_FLUSH_WMAC);
++	do_IRQ(ATH79_CPU_IRQ_IP2);
++}
++
++static void ar71xx_ip3_handler(void)
++{
++	ath79_ddr_wb_flush(AR71XX_DDR_REG_FLUSH_USB);
++	do_IRQ(ATH79_CPU_IRQ_USB);
++}
++
++static void ar724x_ip3_handler(void)
++{
++	ath79_ddr_wb_flush(AR724X_DDR_REG_FLUSH_USB);
++	do_IRQ(ATH79_CPU_IRQ_USB);
++}
++
++static void ar913x_ip3_handler(void)
++{
++	ath79_ddr_wb_flush(AR913X_DDR_REG_FLUSH_USB);
++	do_IRQ(ATH79_CPU_IRQ_USB);
++}
++
++static void ar933x_ip3_handler(void)
++{
++	ath79_ddr_wb_flush(AR933X_DDR_REG_FLUSH_USB);
++	do_IRQ(ATH79_CPU_IRQ_USB);
++}
++
+ void __init arch_init_irq(void)
+ {
+ 	if (soc_is_ar71xx()) {
+-		ath79_ip2_flush_reg = AR71XX_DDR_REG_FLUSH_PCI;
+-		ath79_ip3_flush_reg = AR71XX_DDR_REG_FLUSH_USB;
++		ath79_ip2_handler = ar71xx_ip2_handler;
++		ath79_ip3_handler = ar71xx_ip3_handler;
+ 	} else if (soc_is_ar724x()) {
+-		ath79_ip2_flush_reg = AR724X_DDR_REG_FLUSH_PCIE;
+-		ath79_ip3_flush_reg = AR724X_DDR_REG_FLUSH_USB;
++		ath79_ip2_handler = ar724x_ip2_handler;
++		ath79_ip3_handler = ar724x_ip3_handler;
+ 	} else if (soc_is_ar913x()) {
+-		ath79_ip2_flush_reg = AR913X_DDR_REG_FLUSH_WMAC;
+-		ath79_ip3_flush_reg = AR913X_DDR_REG_FLUSH_USB;
++		ath79_ip2_handler = ar913x_ip2_handler;
++		ath79_ip3_handler = ar913x_ip3_handler;
+ 	} else if (soc_is_ar933x()) {
+-		ath79_ip2_flush_reg = AR933X_DDR_REG_FLUSH_WMAC;
+-		ath79_ip3_flush_reg = AR933X_DDR_REG_FLUSH_USB;
+-	} else
++		ath79_ip2_handler = ar933x_ip2_handler;
++		ath79_ip3_handler = ar933x_ip3_handler;
++	} else {
+ 		BUG();
++	}
+ 
+ 	cp0_perfcount_irq = ATH79_MISC_IRQ_PERFC;
+ 	mips_cpu_irq_init();