arch/mips/ath79/irq.c - kernel/msm-4.9 - Gitiles

 /*
  *  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/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"

 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)
 {
 	void __iomem *base = ath79_reset_base;
 	u32 pending;

 	pending = __raw_readl(base + AR71XX_RESET_REG_MISC_INT_STATUS) &
 		  __raw_readl(base + AR71XX_RESET_REG_MISC_INT_ENABLE);

 	if (pending & MISC_INT_UART)
 		generic_handle_irq(ATH79_MISC_IRQ_UART);

 	else if (pending & MISC_INT_DMA)
 		generic_handle_irq(ATH79_MISC_IRQ_DMA);

 	else if (pending & MISC_INT_PERFC)
 		generic_handle_irq(ATH79_MISC_IRQ_PERFC);

 	else if (pending & MISC_INT_TIMER)
 		generic_handle_irq(ATH79_MISC_IRQ_TIMER);

 	else if (pending & MISC_INT_TIMER2)
 		generic_handle_irq(ATH79_MISC_IRQ_TIMER2);

 	else if (pending & MISC_INT_TIMER3)
 		generic_handle_irq(ATH79_MISC_IRQ_TIMER3);

 	else if (pending & MISC_INT_TIMER4)
 		generic_handle_irq(ATH79_MISC_IRQ_TIMER4);

 	else if (pending & MISC_INT_OHCI)
 		generic_handle_irq(ATH79_MISC_IRQ_OHCI);

 	else if (pending & MISC_INT_ERROR)
 		generic_handle_irq(ATH79_MISC_IRQ_ERROR);

 	else if (pending & MISC_INT_GPIO)
 		generic_handle_irq(ATH79_MISC_IRQ_GPIO);

 	else if (pending & MISC_INT_WDOG)
 		generic_handle_irq(ATH79_MISC_IRQ_WDOG);

 	else if (pending & MISC_INT_ETHSW)
 		generic_handle_irq(ATH79_MISC_IRQ_ETHSW);

 	else
 		spurious_interrupt();
 }

 static void ar71xx_misc_irq_unmask(struct irq_data *d)
 {
 	unsigned int irq = d->irq - ATH79_MISC_IRQ_BASE;
 	void __iomem *base = ath79_reset_base;
 	u32 t;

 	t = __raw_readl(base + AR71XX_RESET_REG_MISC_INT_ENABLE);
 	__raw_writel(t | (1 << irq), base + AR71XX_RESET_REG_MISC_INT_ENABLE);

 	/* flush write */
 	__raw_readl(base + AR71XX_RESET_REG_MISC_INT_ENABLE);
 }

 static void ar71xx_misc_irq_mask(struct irq_data *d)
 {
 	unsigned int irq = d->irq - ATH79_MISC_IRQ_BASE;
 	void __iomem *base = ath79_reset_base;
 	u32 t;

 	t = __raw_readl(base + AR71XX_RESET_REG_MISC_INT_ENABLE);
 	__raw_writel(t & ~(1 << irq), base + AR71XX_RESET_REG_MISC_INT_ENABLE);

 	/* flush write */
 	__raw_readl(base + AR71XX_RESET_REG_MISC_INT_ENABLE);
 }

 static void ar724x_misc_irq_ack(struct irq_data *d)
 {
 	unsigned int irq = d->irq - ATH79_MISC_IRQ_BASE;
 	void __iomem *base = ath79_reset_base;
 	u32 t;

 	t = __raw_readl(base + AR71XX_RESET_REG_MISC_INT_STATUS);
 	__raw_writel(t & ~(1 << irq), base + AR71XX_RESET_REG_MISC_INT_STATUS);

 	/* flush write */
 	__raw_readl(base + AR71XX_RESET_REG_MISC_INT_STATUS);
 }

 static struct irq_chip ath79_misc_irq_chip = {
 	.name		= "MISC",
 	.irq_unmask	= ar71xx_misc_irq_unmask,
 	.irq_mask	= ar71xx_misc_irq_mask,
 };

 static void __init ath79_misc_irq_init(void)
 {
 	void __iomem *base = ath79_reset_base;
 	int i;

 	__raw_writel(0, base + AR71XX_RESET_REG_MISC_INT_ENABLE);
 	__raw_writel(0, base + AR71XX_RESET_REG_MISC_INT_STATUS);

 	if (soc_is_ar71xx() || soc_is_ar913x())
 		ath79_misc_irq_chip.irq_mask_ack = ar71xx_misc_irq_mask;
 	else if (soc_is_ar724x() || soc_is_ar933x() || soc_is_ar934x())
 		ath79_misc_irq_chip.irq_ack = ar724x_misc_irq_ack;
 	else
 		BUG();

 	for (i = ATH79_MISC_IRQ_BASE;
 	     i < ATH79_MISC_IRQ_BASE + ATH79_MISC_IRQ_COUNT; i++) {
 		irq_set_chip_and_handler(i, &ath79_misc_irq_chip,
 					 handle_level_irq);
 	}

 	irq_set_chained_handler(ATH79_CPU_IRQ_MISC, ath79_misc_irq_handler);
 }

 static void ar934x_ip2_irq_dispatch(unsigned int irq, struct irq_desc *desc)
 {
 	u32 status;

 	disable_irq_nosync(irq);

 	status = ath79_reset_rr(AR934X_RESET_REG_PCIE_WMAC_INT_STATUS);

 	if (status & AR934X_PCIE_WMAC_INT_PCIE_ALL) {
 		ath79_ddr_wb_flush(AR934X_DDR_REG_FLUSH_PCIE);
 		generic_handle_irq(ATH79_IP2_IRQ(0));
 	} else if (status & AR934X_PCIE_WMAC_INT_WMAC_ALL) {
 		ath79_ddr_wb_flush(AR934X_DDR_REG_FLUSH_WMAC);
 		generic_handle_irq(ATH79_IP2_IRQ(1));
 	} else {
 		spurious_interrupt();
 	}

 	enable_irq(irq);
 }

 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_IP2, ar934x_ip2_irq_dispatch);
 }

 asmlinkage void plat_irq_dispatch(void)
 {
 	unsigned long pending;

 	pending = read_c0_status() & read_c0_cause() & ST0_IM;

 	if (pending & STATUSF_IP7)
 		do_IRQ(ATH79_CPU_IRQ_TIMER);

 	else if (pending & STATUSF_IP2)
 		ath79_ip2_handler();

 	else if (pending & STATUSF_IP4)
 		do_IRQ(ATH79_CPU_IRQ_GE0);

 	else if (pending & STATUSF_IP5)
 		do_IRQ(ATH79_CPU_IRQ_GE1);

 	else if (pending & STATUSF_IP3)
 		ath79_ip3_handler();

 	else if (pending & STATUSF_IP6)
 		do_IRQ(ATH79_CPU_IRQ_MISC);

 	else
 		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 ar934x_ip2_handler(void)
 {
 	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);
 }

 static void ar934x_ip3_handler(void)
 {
 	ath79_ddr_wb_flush(AR934X_DDR_REG_FLUSH_USB);
 	do_IRQ(ATH79_CPU_IRQ_USB);
 }

 void __init arch_init_irq(void)
 {
 	if (soc_is_ar71xx()) {
 		ath79_ip2_handler = ar71xx_ip2_handler;
 		ath79_ip3_handler = ar71xx_ip3_handler;
 	} else if (soc_is_ar724x()) {
 		ath79_ip2_handler = ar724x_ip2_handler;
 		ath79_ip3_handler = ar724x_ip3_handler;
 	} else if (soc_is_ar913x()) {
 		ath79_ip2_handler = ar913x_ip2_handler;
 		ath79_ip3_handler = ar913x_ip3_handler;
 	} else if (soc_is_ar933x()) {
 		ath79_ip2_handler = ar933x_ip2_handler;
 		ath79_ip3_handler = ar933x_ip3_handler;
 	} else if (soc_is_ar934x()) {
 		ath79_ip2_handler = ar934x_ip2_handler;
 		ath79_ip3_handler = ar934x_ip3_handler;
 	} else {
 		BUG();
 	}

 	cp0_perfcount_irq = ATH79_MISC_IRQ_PERFC;
 	mips_cpu_irq_init();
 	ath79_misc_irq_init();

 	if (soc_is_ar934x())
 		ar934x_ip2_irq_init();
 }
	/*
	* 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/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"

	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)
	{
	void __iomem *base = ath79_reset_base;
	u32 pending;

	pending = __raw_readl(base + AR71XX_RESET_REG_MISC_INT_STATUS) &
	__raw_readl(base + AR71XX_RESET_REG_MISC_INT_ENABLE);

	if (pending & MISC_INT_UART)
	generic_handle_irq(ATH79_MISC_IRQ_UART);

	else if (pending & MISC_INT_DMA)
	generic_handle_irq(ATH79_MISC_IRQ_DMA);

	else if (pending & MISC_INT_PERFC)
	generic_handle_irq(ATH79_MISC_IRQ_PERFC);

	else if (pending & MISC_INT_TIMER)
	generic_handle_irq(ATH79_MISC_IRQ_TIMER);

	else if (pending & MISC_INT_TIMER2)
	generic_handle_irq(ATH79_MISC_IRQ_TIMER2);

	else if (pending & MISC_INT_TIMER3)
	generic_handle_irq(ATH79_MISC_IRQ_TIMER3);

	else if (pending & MISC_INT_TIMER4)
	generic_handle_irq(ATH79_MISC_IRQ_TIMER4);

	else if (pending & MISC_INT_OHCI)
	generic_handle_irq(ATH79_MISC_IRQ_OHCI);

	else if (pending & MISC_INT_ERROR)
	generic_handle_irq(ATH79_MISC_IRQ_ERROR);

	else if (pending & MISC_INT_GPIO)
	generic_handle_irq(ATH79_MISC_IRQ_GPIO);

	else if (pending & MISC_INT_WDOG)
	generic_handle_irq(ATH79_MISC_IRQ_WDOG);

	else if (pending & MISC_INT_ETHSW)
	generic_handle_irq(ATH79_MISC_IRQ_ETHSW);

	else
	spurious_interrupt();
	}

	static void ar71xx_misc_irq_unmask(struct irq_data *d)
	{
	unsigned int irq = d->irq - ATH79_MISC_IRQ_BASE;
	void __iomem *base = ath79_reset_base;
	u32 t;

	t = __raw_readl(base + AR71XX_RESET_REG_MISC_INT_ENABLE);
	__raw_writel(t \| (1 << irq), base + AR71XX_RESET_REG_MISC_INT_ENABLE);

	/* flush write */
	__raw_readl(base + AR71XX_RESET_REG_MISC_INT_ENABLE);
	}

	static void ar71xx_misc_irq_mask(struct irq_data *d)
	{
	unsigned int irq = d->irq - ATH79_MISC_IRQ_BASE;
	void __iomem *base = ath79_reset_base;
	u32 t;

	t = __raw_readl(base + AR71XX_RESET_REG_MISC_INT_ENABLE);
	__raw_writel(t & ~(1 << irq), base + AR71XX_RESET_REG_MISC_INT_ENABLE);

	/* flush write */
	__raw_readl(base + AR71XX_RESET_REG_MISC_INT_ENABLE);
	}

	static void ar724x_misc_irq_ack(struct irq_data *d)
	{
	unsigned int irq = d->irq - ATH79_MISC_IRQ_BASE;
	void __iomem *base = ath79_reset_base;
	u32 t;

	t = __raw_readl(base + AR71XX_RESET_REG_MISC_INT_STATUS);
	__raw_writel(t & ~(1 << irq), base + AR71XX_RESET_REG_MISC_INT_STATUS);

	/* flush write */
	__raw_readl(base + AR71XX_RESET_REG_MISC_INT_STATUS);
	}

	static struct irq_chip ath79_misc_irq_chip = {
	.name = "MISC",
	.irq_unmask = ar71xx_misc_irq_unmask,
	.irq_mask = ar71xx_misc_irq_mask,
	};

	static void __init ath79_misc_irq_init(void)
	{
	void __iomem *base = ath79_reset_base;
	int i;

	__raw_writel(0, base + AR71XX_RESET_REG_MISC_INT_ENABLE);
	__raw_writel(0, base + AR71XX_RESET_REG_MISC_INT_STATUS);

	if (soc_is_ar71xx() \|\| soc_is_ar913x())
	ath79_misc_irq_chip.irq_mask_ack = ar71xx_misc_irq_mask;
	else if (soc_is_ar724x() \|\| soc_is_ar933x() \|\| soc_is_ar934x())
	ath79_misc_irq_chip.irq_ack = ar724x_misc_irq_ack;
	else
	BUG();

	for (i = ATH79_MISC_IRQ_BASE;
	i < ATH79_MISC_IRQ_BASE + ATH79_MISC_IRQ_COUNT; i++) {
	irq_set_chip_and_handler(i, &ath79_misc_irq_chip,
	handle_level_irq);
	}

	irq_set_chained_handler(ATH79_CPU_IRQ_MISC, ath79_misc_irq_handler);
	}

	static void ar934x_ip2_irq_dispatch(unsigned int irq, struct irq_desc *desc)
	{
	u32 status;

	disable_irq_nosync(irq);

	status = ath79_reset_rr(AR934X_RESET_REG_PCIE_WMAC_INT_STATUS);

	if (status & AR934X_PCIE_WMAC_INT_PCIE_ALL) {
	ath79_ddr_wb_flush(AR934X_DDR_REG_FLUSH_PCIE);
	generic_handle_irq(ATH79_IP2_IRQ(0));
	} else if (status & AR934X_PCIE_WMAC_INT_WMAC_ALL) {
	ath79_ddr_wb_flush(AR934X_DDR_REG_FLUSH_WMAC);
	generic_handle_irq(ATH79_IP2_IRQ(1));
	} else {
	spurious_interrupt();
	}

	enable_irq(irq);
	}

	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_IP2, ar934x_ip2_irq_dispatch);
	}

	asmlinkage void plat_irq_dispatch(void)
	{
	unsigned long pending;

	pending = read_c0_status() & read_c0_cause() & ST0_IM;

	if (pending & STATUSF_IP7)
	do_IRQ(ATH79_CPU_IRQ_TIMER);

	else if (pending & STATUSF_IP2)
	ath79_ip2_handler();

	else if (pending & STATUSF_IP4)
	do_IRQ(ATH79_CPU_IRQ_GE0);

	else if (pending & STATUSF_IP5)
	do_IRQ(ATH79_CPU_IRQ_GE1);

	else if (pending & STATUSF_IP3)
	ath79_ip3_handler();

	else if (pending & STATUSF_IP6)
	do_IRQ(ATH79_CPU_IRQ_MISC);

	else
	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 ar934x_ip2_handler(void)
	{
	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);
	}

	static void ar934x_ip3_handler(void)
	{
	ath79_ddr_wb_flush(AR934X_DDR_REG_FLUSH_USB);
	do_IRQ(ATH79_CPU_IRQ_USB);
	}

	void __init arch_init_irq(void)
	{
	if (soc_is_ar71xx()) {
	ath79_ip2_handler = ar71xx_ip2_handler;
	ath79_ip3_handler = ar71xx_ip3_handler;
	} else if (soc_is_ar724x()) {
	ath79_ip2_handler = ar724x_ip2_handler;
	ath79_ip3_handler = ar724x_ip3_handler;
	} else if (soc_is_ar913x()) {
	ath79_ip2_handler = ar913x_ip2_handler;
	ath79_ip3_handler = ar913x_ip3_handler;
	} else if (soc_is_ar933x()) {
	ath79_ip2_handler = ar933x_ip2_handler;
	ath79_ip3_handler = ar933x_ip3_handler;
	} else if (soc_is_ar934x()) {
	ath79_ip2_handler = ar934x_ip2_handler;
	ath79_ip3_handler = ar934x_ip3_handler;
	} else {
	BUG();
	}

	cp0_perfcount_irq = ATH79_MISC_IRQ_PERFC;
	mips_cpu_irq_init();
	ath79_misc_irq_init();

	if (soc_is_ar934x())
	ar934x_ip2_irq_init();
	}