irq.c
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/*
* Atheros AR71xx/AR724x/AR913x specific interrupt handling
*
* Copyright (C) 2010-2011 Jaiganesh Narayanan <jnarayanan@atheros.com>
* 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' 2.6.15/2.6.31 BSP
*
* This program is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License version 2 as published
* by the Free Software Foundation.
*/
#include <linux/kernel.h>
#include <linux/init.h>
#include <linux/interrupt.h>
#include <linux/irqchip.h>
#include <linux/of_irq.h>
#include <asm/irq_cpu.h>
#include <asm/mipsregs.h>
#include <asm/mach-ath79/ath79.h>
#include <asm/mach-ath79/ar71xx_regs.h>
#include "common.h"
#include "machtypes.h"
static void ar934x_ip2_irq_dispatch(struct irq_desc *desc)
{
u32 status;
status = ath79_reset_rr(AR934X_RESET_REG_PCIE_WMAC_INT_STATUS);
if (status & AR934X_PCIE_WMAC_INT_PCIE_ALL) {
ath79_ddr_wb_flush(3);
generic_handle_irq(ATH79_IP2_IRQ(0));
} else if (status & AR934X_PCIE_WMAC_INT_WMAC_ALL) {
ath79_ddr_wb_flush(4);
generic_handle_irq(ATH79_IP2_IRQ(1));
} else {
spurious_interrupt();
}
}
static void ar934x_ip2_irq_init(void)
{
int i;
for (i = ATH79_IP2_IRQ_BASE;
i < ATH79_IP2_IRQ_BASE + ATH79_IP2_IRQ_COUNT; i++)
irq_set_chip_and_handler(i, &dummy_irq_chip,
handle_level_irq);
irq_set_chained_handler(ATH79_CPU_IRQ(2), ar934x_ip2_irq_dispatch);
}
static void qca955x_ip2_irq_dispatch(struct irq_desc *desc)
{
u32 status;
status = ath79_reset_rr(QCA955X_RESET_REG_EXT_INT_STATUS);
status &= QCA955X_EXT_INT_PCIE_RC1_ALL | QCA955X_EXT_INT_WMAC_ALL;
if (status == 0) {
spurious_interrupt();
return;
}
if (status & QCA955X_EXT_INT_PCIE_RC1_ALL) {
/* TODO: flush DDR? */
generic_handle_irq(ATH79_IP2_IRQ(0));
}
if (status & QCA955X_EXT_INT_WMAC_ALL) {
/* TODO: flush DDR? */
generic_handle_irq(ATH79_IP2_IRQ(1));
}
}
static void qca955x_ip3_irq_dispatch(struct irq_desc *desc)
{
u32 status;
status = ath79_reset_rr(QCA955X_RESET_REG_EXT_INT_STATUS);
status &= QCA955X_EXT_INT_PCIE_RC2_ALL |
QCA955X_EXT_INT_USB1 |
QCA955X_EXT_INT_USB2;
if (status == 0) {
spurious_interrupt();
return;
}
if (status & QCA955X_EXT_INT_USB1) {
/* TODO: flush DDR? */
generic_handle_irq(ATH79_IP3_IRQ(0));
}
if (status & QCA955X_EXT_INT_USB2) {
/* TODO: flush DDR? */
generic_handle_irq(ATH79_IP3_IRQ(1));
}
if (status & QCA955X_EXT_INT_PCIE_RC2_ALL) {
/* TODO: flush DDR? */
generic_handle_irq(ATH79_IP3_IRQ(2));
}
}
static void qca955x_irq_init(void)
{
int i;
for (i = ATH79_IP2_IRQ_BASE;
i < ATH79_IP2_IRQ_BASE + ATH79_IP2_IRQ_COUNT; i++)
irq_set_chip_and_handler(i, &dummy_irq_chip,
handle_level_irq);
irq_set_chained_handler(ATH79_CPU_IRQ(2), qca955x_ip2_irq_dispatch);
for (i = ATH79_IP3_IRQ_BASE;
i < ATH79_IP3_IRQ_BASE + ATH79_IP3_IRQ_COUNT; i++)
irq_set_chip_and_handler(i, &dummy_irq_chip,
handle_level_irq);
irq_set_chained_handler(ATH79_CPU_IRQ(3), qca955x_ip3_irq_dispatch);
}
void __init arch_init_irq(void)
{
unsigned irq_wb_chan2 = -1;
unsigned irq_wb_chan3 = -1;
bool misc_is_ar71xx;
if (mips_machtype == ATH79_MACH_GENERIC_OF) {
irqchip_init();
return;
}
if (soc_is_ar71xx() || soc_is_ar724x() ||
soc_is_ar913x() || soc_is_ar933x()) {
irq_wb_chan2 = 3;
irq_wb_chan3 = 2;
} else if (soc_is_ar934x()) {
irq_wb_chan3 = 2;
}
ath79_cpu_irq_init(irq_wb_chan2, irq_wb_chan3);
if (soc_is_ar71xx() || soc_is_ar913x())
misc_is_ar71xx = true;
else if (soc_is_ar724x() ||
soc_is_ar933x() ||
soc_is_ar934x() ||
soc_is_qca955x())
misc_is_ar71xx = false;
else
BUG();
ath79_misc_irq_init(
ath79_reset_base + AR71XX_RESET_REG_MISC_INT_STATUS,
ATH79_CPU_IRQ(6), ATH79_MISC_IRQ_BASE, misc_is_ar71xx);
if (soc_is_ar934x())
ar934x_ip2_irq_init();
else if (soc_is_qca955x())
qca955x_irq_init();
}