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[backfire] ar71xx: backport pci/dma fix from r21143

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git-svn-id: svn://svn.openwrt.org/openwrt/branches/backfire@21207 3c298f89-4303-0410-b956-a3cf2f4a3e73
This commit is contained in:
nbd 2010-04-27 18:50:56 +00:00
parent d30d6eb758
commit 7681afa16d
1 changed files with 26 additions and 1 deletions
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27
target/linux/ar71xx/files/arch/mips/ar71xx/irq.c
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@ -21,6 +21,8 @@
#include <asm/mach-ar71xx/ar71xx.h>
static int ip2_flush_reg;
static void ar71xx_gpio_irq_dispatch(void)
{
void __iomem *base = ar71xx_gpio_base;
@ -239,8 +241,17 @@ asmlinkage void plat_irq_dispatch(void)
if (pending & STATUSF_IP7)
do_IRQ(AR71XX_CPU_IRQ_TIMER);
else if (pending & STATUSF_IP2)
else if (pending & STATUSF_IP2) {
/*
* This IRQ is meant for a PCI device. Drivers for PCI devices
* typically allocate coherent DMA memory for the descriptor
* ring, however the DMA controller may still have some
* unsynchronized data in the FIFO.
* Issue a flush here to ensure that the driver sees the update.
*/
ar71xx_ddr_flush(ip2_flush_reg);
do_IRQ(AR71XX_CPU_IRQ_IP2);
}
else if (pending & STATUSF_IP4)
do_IRQ(AR71XX_CPU_IRQ_GE0);
@ -260,6 +271,20 @@ asmlinkage void plat_irq_dispatch(void)
void __init arch_init_irq(void)
{
switch(ar71xx_soc) {
case AR71XX_SOC_AR7240:
case AR71XX_SOC_AR7241:
case AR71XX_SOC_AR7242:
ip2_flush_reg = AR724X_DDR_REG_FLUSH_PCIE;
break;
case AR71XX_SOC_AR9130:
case AR71XX_SOC_AR9132:
ip2_flush_reg = AR91XX_DDR_REG_FLUSH_WMAC;
break;
default:
ip2_flush_reg = AR71XX_DDR_REG_FLUSH_PCI;
break;
}
mips_cpu_irq_init();
ar71xx_misc_irq_init();