arch/mips/brcmstb/irq.c - kernel/bruno - Git at Google

 /*
  * Copyright (C) 2009 Broadcom Corporation
  *
  * 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.
  *
  * This program is distributed in the hope that it will be useful,
  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
  * GNU General Public License for more details.
  *
  * You should have received a copy of the GNU General Public License
  * along with this program; if not, write to the Free Software
  * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
  */

 #include <linux/init.h>
 #include <linux/module.h>
 #include <linux/sched.h>
 #include <linux/interrupt.h>
 #include <linux/irq.h>
 #include <linux/cpumask.h>
 #include <linux/smp.h>
 #include <linux/io.h>
 #include <linux/bitops.h>
 #include <linux/version.h>

 #include <asm/irq.h>
 #include <asm/mipsregs.h>
 #include <asm/addrspace.h>
 #include <asm/irq_cpu.h>
 #include <linux/brcmstb/brcmstb.h>

 #ifdef CONFIG_SMP
 static int next_cpu[NR_IRQS + 1] = { [0 ... NR_IRQS] = 0 };
 #define NEXT_CPU(irq) next_cpu[irq]

 #define TP0_BASE BCHP_HIF_CPU_INTR1_REG_START
 #define TP1_BASE BCHP_HIF_CPU_TP1_INTR1_REG_START
 #define L1_WR_ALL(word, reg, val) do { \
 	L1_WR_##word(TP0_BASE, reg, val); \
 	if (cpu_online(1)) \
 		L1_WR_##word(TP1_BASE, reg, val); \
 	} while (0)

 #else

 #define TP0_BASE BCHP_HIF_CPU_INTR1_REG_START
 #define TP1_BASE TP0_BASE
 #define L1_WR_ALL(word, reg, val) do { \
 	L1_WR_##word(TP0_BASE, reg, val); \
 	} while (0)

 #define NEXT_CPU(irq) 0
 #endif

 #define L1_REG(base, off) ((base) + (off) - BCHP_HIF_CPU_INTR1_REG_START)

 #define L1_RD_W0(base, reg) \
 	BDEV_RD(L1_REG(base, BCHP_HIF_CPU_INTR1_INTR_W0_##reg))
 #define L1_RD_W1(base, reg) \
 	BDEV_RD(L1_REG(base, BCHP_HIF_CPU_INTR1_INTR_W1_##reg))

 #define L1_WR_W0(base, reg, val) \
 	BDEV_WR_RB(L1_REG(base, BCHP_HIF_CPU_INTR1_INTR_W0_##reg), val)
 #define L1_WR_W1(base, reg, val) \
 	BDEV_WR_RB(L1_REG(base, BCHP_HIF_CPU_INTR1_INTR_W1_##reg), val)

 #if defined(BCHP_HIF_CPU_INTR1_INTR_W2_STATUS)

 #define L1_RD_W2(base, reg) \
 	BDEV_RD(L1_REG(base, BCHP_HIF_CPU_INTR1_INTR_W2_##reg))
 #define L1_WR_W2(base, reg, val) \
 	BDEV_WR_RB(L1_REG(base, BCHP_HIF_CPU_INTR1_INTR_W2_##reg), val)

 #else
 /* nop on chips with only 64 L1 interrupts */
 #define L1_RD_W2(base, reg)	0
 #define L1_WR_W2(base, reg, val) do { } while (0)
 #endif

 #if defined(BCHP_HIF_CPU_INTR1_INTR_W3_STATUS)

 #define L1_RD_W3(base, reg) \
 	BDEV_RD(L1_REG(base, BCHP_HIF_CPU_INTR1_INTR_W3_##reg))
 #define L1_WR_W3(base, reg, val) \
 	BDEV_WR_RB(L1_REG(base, BCHP_HIF_CPU_INTR1_INTR_W3_##reg), val)

 #else
 /* nop on chips with only 96 L1 interrupts */
 #define L1_RD_W3(base, reg)	0
 #define L1_WR_W3(base, reg, val) do { } while (0)
 #endif

 /*
  * For interrupt map, see include/asm-mips/brcmstb/<plat>/bcmintrnum.h
  */

 /***********************************************************************
  * INTC (aka L1 interrupt) functions
  ***********************************************************************/

 static void brcm_intc_enable(struct irq_data *d)
 {
 	unsigned int irq = d->irq;
 	unsigned int shift;
 	unsigned long base = NEXT_CPU(irq) ? TP1_BASE : TP0_BASE;

 	if (irq > 0 && irq <= 32) {
 		shift = irq - 1;
 		L1_WR_W0(base, MASK_CLEAR, (1UL << shift));
 	} else if (irq > 32 && irq <= 32+32) {
 		shift = irq - 32 - 1;
 		L1_WR_W1(base, MASK_CLEAR, (1UL << shift));
 	} else if (irq > 64 && irq <= 32+32+32) {
 		shift = irq - 64 - 1;
 		L1_WR_W2(base, MASK_CLEAR, (1UL << shift));
 	} else if (irq > 96 && irq <= 32+32+32+32) {
 		shift = irq - 96 - 1;
 		L1_WR_W3(base, MASK_CLEAR, (1UL << shift));
 	} else
 		BUG();
 }

 static void brcm_intc_disable(struct irq_data *d)
 {
 	unsigned int irq = d->irq;
 	unsigned int shift;

 	if (irq > 0 && irq <= 32) {
 		shift = irq - 1;
 		L1_WR_ALL(W0, MASK_SET, (1UL << shift));
 	} else if (irq > 32 && irq <= 32+32) {
 		shift = irq - 32 - 1;
 		L1_WR_ALL(W1, MASK_SET, (1UL << shift));
 	} else if (irq > 64 && irq <= 32+32+32) {
 		shift = irq - 64 - 1;
 		L1_WR_ALL(W2, MASK_SET, (1UL << shift));
 	} else if (irq > 96 && irq <= 32+32+32+32) {
 		shift = irq - 96 - 1;
 		L1_WR_ALL(W3, MASK_SET, (1UL << shift));
 	} else
 		BUG();
 }

 #ifdef CONFIG_SMP
 static int brcm_intc_set_affinity(struct irq_data *d,
 	const struct cpumask *dest, bool force)
 {
 	unsigned int irq = d->irq;
 	unsigned int shift;
 	unsigned long flags;

 	local_irq_save(flags);
 	if (irq > 0 && irq <= 32) {
 		shift = irq - 1;

 		if (cpumask_test_cpu(0, dest)) {
 			L1_WR_W0(TP1_BASE, MASK_SET, (1UL << shift));
 			L1_WR_W0(TP0_BASE, MASK_CLEAR, (1UL << shift));
 			next_cpu[irq] = 0;
 		} else {
 			L1_WR_W0(TP0_BASE, MASK_SET, (1UL << shift));
 			L1_WR_W0(TP1_BASE, MASK_CLEAR, (1UL << shift));
 			next_cpu[irq] = 1;
 		}
 	} else if (irq > 32 && irq <= 64) {
 		shift = irq - 32 - 1;
 		next_cpu[irq] = 0;

 		if (cpumask_test_cpu(0, dest)) {
 			L1_WR_W1(TP1_BASE, MASK_SET, (1UL << shift));
 			L1_WR_W1(TP0_BASE, MASK_CLEAR, (1UL << shift));
 			next_cpu[irq] = 0;
 		} else {
 			L1_WR_W1(TP0_BASE, MASK_SET, (1UL << shift));
 			L1_WR_W1(TP1_BASE, MASK_CLEAR, (1UL << shift));
 			next_cpu[irq] = 1;
 		}
 	} else if (irq > 64 && irq <= 96) {
 		shift = irq - 64 - 1;
 		next_cpu[irq] = 0;

 		if (cpumask_test_cpu(0, dest)) {
 			L1_WR_W2(TP1_BASE, MASK_SET, (1UL << shift));
 			L1_WR_W2(TP0_BASE, MASK_CLEAR, (1UL << shift));
 			next_cpu[irq] = 0;
 		} else {
 			L1_WR_W2(TP0_BASE, MASK_SET, (1UL << shift));
 			L1_WR_W2(TP1_BASE, MASK_CLEAR, (1UL << shift));
 			next_cpu[irq] = 1;
 		}
 	} else if (irq > 96 && irq <= 128) {
 		shift = irq - 96 - 1;
 		next_cpu[irq] = 0;

 		if (cpumask_test_cpu(0, dest)) {
 			L1_WR_W3(TP1_BASE, MASK_SET, (1UL << shift));
 			L1_WR_W3(TP0_BASE, MASK_CLEAR, (1UL << shift));
 			next_cpu[irq] = 0;
 		} else {
 			L1_WR_W3(TP0_BASE, MASK_SET, (1UL << shift));
 			L1_WR_W3(TP1_BASE, MASK_CLEAR, (1UL << shift));
 			next_cpu[irq] = 1;
 		}
 	}
 	local_irq_restore(flags);
 	return 0;
 }
 #endif /* CONFIG_SMP */

 /*
  * THT: These INTC disable the interrupt before calling the IRQ handle_irq
  */
 static struct irq_chip brcm_intc_type = {
 	.name			= "BRCM L1",
 	.irq_ack		= brcm_intc_disable,
 	.irq_mask		= brcm_intc_disable,
 	.irq_mask_ack		= brcm_intc_disable,
 	.irq_unmask		= brcm_intc_enable,
 #ifdef CONFIG_SMP
 	.irq_set_affinity	= brcm_intc_set_affinity,
 #endif /* CONFIG_SMP */
 	NULL
 };

 /*
  * Move the interrupt to the other TP, to balance load (if affinity permits)
  */
 static void flip_tp(int irq)
 {
 #ifndef CONFIG_BRUNO
 #ifdef CONFIG_SMP
 	int tp = smp_processor_id();
 	unsigned long local_lev1, remote_lev1;
 	unsigned long mask = 1 << ((irq - 1) & 0x1f);

 	if (tp == 0) {
 		local_lev1 = TP0_BASE;
 		remote_lev1 = TP1_BASE;
 	} else {
 		local_lev1 = TP1_BASE;
 		remote_lev1 = TP0_BASE;
 	}

 	if (cpumask_test_cpu(tp ^ 1, irq_desc[irq].irq_data.affinity)) {
 		next_cpu[irq] = tp ^ 1;
 		if (irq > 0 && irq <= 32) {
 			L1_WR_W0(local_lev1, MASK_SET, mask);
 			L1_WR_W0(remote_lev1, MASK_CLEAR, mask);
 		}
 		if (irq > 32 && irq <= 64) {
 			L1_WR_W1(local_lev1, MASK_SET, mask);
 			L1_WR_W1(remote_lev1, MASK_CLEAR, mask);
 		}
 		if (irq > 64 && irq <= 96) {
 			L1_WR_W2(local_lev1, MASK_SET, mask);
 			L1_WR_W2(remote_lev1, MASK_CLEAR, mask);
 		}
 		if (irq > 96 && irq <= 128) {
 			L1_WR_W3(local_lev1, MASK_SET, mask);
 			L1_WR_W3(remote_lev1, MASK_CLEAR, mask);
 		}
 	}
 #endif /* CONFIG_SMP */
 #endif
 }

 static void brcm_intc_dispatch(unsigned long base)
 {
 	u32 pend, shift;

 	pend = L1_RD_W0(base, STATUS) & ~L1_RD_W0(base, MASK_STATUS);
 	while ((shift = ffs(pend)) != 0) {
 		pend ^= (1 << (shift - 1));
 		do_IRQ(shift);
 		flip_tp(shift);
 	}

 	pend = L1_RD_W1(base, STATUS) & ~L1_RD_W1(base, MASK_STATUS);
 	while ((shift = ffs(pend)) != 0) {
 		pend ^= (1 << (shift - 1));
 		shift += 32;
 		do_IRQ(shift);
 		flip_tp(shift);
 	}
 	pend = L1_RD_W2(base, STATUS) & ~L1_RD_W2(base, MASK_STATUS);
 	while ((shift = ffs(pend)) != 0) {
 		pend ^= (1 << (shift - 1));
 		shift += 64;
 		do_IRQ(shift);
 		flip_tp(shift);
 	}
 	pend = L1_RD_W3(base, STATUS) & ~L1_RD_W3(base, MASK_STATUS);
 	while ((shift = ffs(pend)) != 0) {
 		pend ^= (1 << (shift - 1));
 		shift += 96;
 		do_IRQ(shift);
 		flip_tp(shift);
 	}
 }

 /* IRQ2 = L1 interrupt for TP0 */
 static void brcm_mips_int2_dispatch(void)
 {
 	clear_c0_status(STATUSF_IP2);
 	brcm_intc_dispatch(TP0_BASE);
 	set_c0_status(STATUSF_IP2);
 }

 #ifdef CONFIG_SMP
 /* IRQ3 = L1 interrupt for TP1 */
 static void brcm_mips_int3_dispatch(void)
 {
 	clear_c0_status(STATUSF_IP3);
 	brcm_intc_dispatch(TP1_BASE);
 	set_c0_status(STATUSF_IP3);
 }
 #endif

 /***********************************************************************
  * IRQ setup / dispatch
  ***********************************************************************/

 void __init arch_init_irq(void)
 {
 	int irq;

 	mips_cpu_irq_init();

 	L1_WR_ALL(W0, MASK_SET, 0xffffffff);
 	L1_WR_ALL(W1, MASK_SET, 0xffffffff);
 	L1_WR_ALL(W2, MASK_SET, 0xffffffff);
 	L1_WR_ALL(W3, MASK_SET, 0xffffffff);

 	clear_c0_status(ST0_IE | ST0_IM);

 	/* Set up all L1 IRQs */
 	for (irq = 1; irq < BRCM_VIRTIRQ_BASE; irq++)
 #if LINUX_VERSION_CODE >= KERNEL_VERSION(2, 6, 39)
 		irq_set_chip_and_handler(irq, &brcm_intc_type,
 			handle_level_irq);
 #else
 		set_irq_chip_and_handler(irq, &brcm_intc_type,
 			handle_level_irq);
 #endif

 #if defined(CONFIG_SMP)
 	/* default affinity: 1 (TP0 only) */
 	cpumask_clear(irq_default_affinity);
 	cpumask_set_cpu(0, irq_default_affinity);
 #endif

 	/* enable IRQ2 (this runs on TP0).  IRQ3 enabled during TP1 boot. */
 	set_c0_status(STATUSF_IP2);

 	/* enable non-shared UART interrupts in the L2 */

 #if defined(BCHP_IRQ0_UART_IRQEN_uarta_MASK)
 	/* 3548 style - separate register */
 	BDEV_WR(BCHP_IRQ0_UART_IRQEN, BCHP_IRQ0_UART_IRQEN_uarta_MASK |
 		BCHP_IRQ0_UART_IRQEN_uartb_MASK |
 		BCHP_IRQ0_UART_IRQEN_uartc_MASK);
 	BDEV_WR(BCHP_IRQ0_IRQEN, 0);
 #elif defined(BCHP_IRQ0_IRQEN_uarta_irqen_MASK)
 	/* 7405 style - shared with L2 */
 	BDEV_WR(BCHP_IRQ0_IRQEN, BCHP_IRQ0_IRQEN_uarta_irqen_MASK
 		| BCHP_IRQ0_IRQEN_uartb_irqen_MASK
 #if defined(BCHP_IRQ0_IRQEN_uartc_irqen_MASK)
 		| BCHP_IRQ0_IRQEN_uartc_irqen_MASK
 #endif
 		);
 #endif

 #if defined(BCHP_HIF_INTR2_CPU_MASK_SET)
 	/* mask and clear all HIF L2 interrupts */
 	BDEV_WR_RB(BCHP_HIF_INTR2_CPU_MASK_SET, 0xffffffff);
 	BDEV_WR_RB(BCHP_HIF_INTR2_CPU_CLEAR, 0xffffffff);
 #endif
 }

 asmlinkage void plat_irq_dispatch(void)
 {
 	unsigned int pend = ((read_c0_cause() & read_c0_status()) >> 8) & 0xff;
 	unsigned int shift;

 	while ((shift = ffs(pend)) != 0) {
 		shift--;
 		pend ^= 1 << shift;
 		if (shift == 2)
 			brcm_mips_int2_dispatch();
 #ifdef CONFIG_SMP
 		else if (unlikely(shift == 3))
 			brcm_mips_int3_dispatch();
 #endif
 		else
 			do_IRQ(MIPS_CPU_IRQ_BASE + shift);
 	}
 }

 /***********************************************************************
  * Power management
  ***********************************************************************/

 static unsigned long brcm_irq_state[NR_IRQS / 32];

 void brcm_irq_standby_enter(int wake_irq)
 {
 	/* save the current state, then mask everything */
 	brcm_irq_state[0] = L1_RD_W0(TP0_BASE, MASK_STATUS);
 	L1_WR_W0(TP0_BASE, MASK_SET, 0xffffffff);
 	brcm_irq_state[1] = L1_RD_W1(TP0_BASE, MASK_STATUS);
 	L1_WR_W1(TP0_BASE, MASK_SET, 0xffffffff);
 	brcm_irq_state[2] = L1_RD_W2(TP0_BASE, MASK_STATUS);
 	L1_WR_W2(TP0_BASE, MASK_SET, 0xffffffff);
 	brcm_irq_state[3] = L1_RD_W3(TP0_BASE, MASK_STATUS);
 	L1_WR_W3(TP0_BASE, MASK_SET, 0xffffffff);

 	/* unmask the wakeup IRQ */
 	if (wake_irq > 0 && wake_irq <= 32)
 		L1_WR_W0(TP0_BASE, MASK_CLEAR, 1 << (wake_irq - 1));
 	else if (wake_irq > 32 && wake_irq <= 64)
 		L1_WR_W1(TP0_BASE, MASK_CLEAR, 1 << (wake_irq - 33));
 	else if (wake_irq > 64 && wake_irq <= 96)
 		L1_WR_W2(TP0_BASE, MASK_CLEAR, 1 << (wake_irq - 65));
 	else if (wake_irq > 96 && wake_irq <= 128)
 		L1_WR_W3(TP0_BASE, MASK_CLEAR, 1 << (wake_irq - 97));
 }

 void brcm_irq_standby_exit(void)
 {
 	/* restore the saved L1 state */
 	L1_WR_W0(TP0_BASE, MASK_SET, 0xffffffff);
 	L1_WR_W0(TP0_BASE, MASK_CLEAR, ~brcm_irq_state[0]);
 	L1_WR_W1(TP0_BASE, MASK_SET, 0xffffffff);
 	L1_WR_W1(TP0_BASE, MASK_CLEAR, ~brcm_irq_state[1]);
 	L1_WR_W2(TP0_BASE, MASK_SET, 0xffffffff);
 	L1_WR_W2(TP0_BASE, MASK_CLEAR, ~brcm_irq_state[2]);
 	L1_WR_W3(TP0_BASE, MASK_SET, 0xffffffff);
 	L1_WR_W3(TP0_BASE, MASK_CLEAR, ~brcm_irq_state[3]);
 }
	/*
	* Copyright (C) 2009 Broadcom Corporation
	*
	* 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.
	*
	* This program is distributed in the hope that it will be useful,
	* but WITHOUT ANY WARRANTY; without even the implied warranty of
	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
	* GNU General Public License for more details.
	*
	* You should have received a copy of the GNU General Public License
	* along with this program; if not, write to the Free Software
	* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
	*/

	#include <linux/init.h>
	#include <linux/module.h>
	#include <linux/sched.h>
	#include <linux/interrupt.h>
	#include <linux/irq.h>
	#include <linux/cpumask.h>
	#include <linux/smp.h>
	#include <linux/io.h>
	#include <linux/bitops.h>
	#include <linux/version.h>

	#include <asm/irq.h>
	#include <asm/mipsregs.h>
	#include <asm/addrspace.h>
	#include <asm/irq_cpu.h>
	#include <linux/brcmstb/brcmstb.h>

	#ifdef CONFIG_SMP
	static int next_cpu[NR_IRQS + 1] = { [0 ... NR_IRQS] = 0 };
	#define NEXT_CPU(irq) next_cpu[irq]

	#define TP0_BASE BCHP_HIF_CPU_INTR1_REG_START
	#define TP1_BASE BCHP_HIF_CPU_TP1_INTR1_REG_START
	#define L1_WR_ALL(word, reg, val) do { \
	L1_WR_##word(TP0_BASE, reg, val); \
	if (cpu_online(1)) \
	L1_WR_##word(TP1_BASE, reg, val); \
	} while (0)

	#else

	#define TP0_BASE BCHP_HIF_CPU_INTR1_REG_START
	#define TP1_BASE TP0_BASE
	#define L1_WR_ALL(word, reg, val) do { \
	L1_WR_##word(TP0_BASE, reg, val); \
	} while (0)

	#define NEXT_CPU(irq) 0
	#endif

	#define L1_REG(base, off) ((base) + (off) - BCHP_HIF_CPU_INTR1_REG_START)

	#define L1_RD_W0(base, reg) \
	BDEV_RD(L1_REG(base, BCHP_HIF_CPU_INTR1_INTR_W0_##reg))
	#define L1_RD_W1(base, reg) \
	BDEV_RD(L1_REG(base, BCHP_HIF_CPU_INTR1_INTR_W1_##reg))

	#define L1_WR_W0(base, reg, val) \
	BDEV_WR_RB(L1_REG(base, BCHP_HIF_CPU_INTR1_INTR_W0_##reg), val)
	#define L1_WR_W1(base, reg, val) \
	BDEV_WR_RB(L1_REG(base, BCHP_HIF_CPU_INTR1_INTR_W1_##reg), val)

	#if defined(BCHP_HIF_CPU_INTR1_INTR_W2_STATUS)

	#define L1_RD_W2(base, reg) \
	BDEV_RD(L1_REG(base, BCHP_HIF_CPU_INTR1_INTR_W2_##reg))
	#define L1_WR_W2(base, reg, val) \
	BDEV_WR_RB(L1_REG(base, BCHP_HIF_CPU_INTR1_INTR_W2_##reg), val)

	#else
	/* nop on chips with only 64 L1 interrupts */
	#define L1_RD_W2(base, reg) 0
	#define L1_WR_W2(base, reg, val) do { } while (0)
	#endif

	#if defined(BCHP_HIF_CPU_INTR1_INTR_W3_STATUS)

	#define L1_RD_W3(base, reg) \
	BDEV_RD(L1_REG(base, BCHP_HIF_CPU_INTR1_INTR_W3_##reg))
	#define L1_WR_W3(base, reg, val) \
	BDEV_WR_RB(L1_REG(base, BCHP_HIF_CPU_INTR1_INTR_W3_##reg), val)

	#else
	/* nop on chips with only 96 L1 interrupts */
	#define L1_RD_W3(base, reg) 0
	#define L1_WR_W3(base, reg, val) do { } while (0)
	#endif

	/*
	* For interrupt map, see include/asm-mips/brcmstb/<plat>/bcmintrnum.h
	*/

	/***********************************************************************
	* INTC (aka L1 interrupt) functions
	***********************************************************************/

	static void brcm_intc_enable(struct irq_data *d)
	{
	unsigned int irq = d->irq;
	unsigned int shift;
	unsigned long base = NEXT_CPU(irq) ? TP1_BASE : TP0_BASE;

	if (irq > 0 && irq <= 32) {
	shift = irq - 1;
	L1_WR_W0(base, MASK_CLEAR, (1UL << shift));
	} else if (irq > 32 && irq <= 32+32) {
	shift = irq - 32 - 1;
	L1_WR_W1(base, MASK_CLEAR, (1UL << shift));
	} else if (irq > 64 && irq <= 32+32+32) {
	shift = irq - 64 - 1;
	L1_WR_W2(base, MASK_CLEAR, (1UL << shift));
	} else if (irq > 96 && irq <= 32+32+32+32) {
	shift = irq - 96 - 1;
	L1_WR_W3(base, MASK_CLEAR, (1UL << shift));
	} else
	BUG();
	}

	static void brcm_intc_disable(struct irq_data *d)
	{
	unsigned int irq = d->irq;
	unsigned int shift;

	if (irq > 0 && irq <= 32) {
	shift = irq - 1;
	L1_WR_ALL(W0, MASK_SET, (1UL << shift));
	} else if (irq > 32 && irq <= 32+32) {
	shift = irq - 32 - 1;
	L1_WR_ALL(W1, MASK_SET, (1UL << shift));
	} else if (irq > 64 && irq <= 32+32+32) {
	shift = irq - 64 - 1;
	L1_WR_ALL(W2, MASK_SET, (1UL << shift));
	} else if (irq > 96 && irq <= 32+32+32+32) {
	shift = irq - 96 - 1;
	L1_WR_ALL(W3, MASK_SET, (1UL << shift));
	} else
	BUG();
	}

	#ifdef CONFIG_SMP
	static int brcm_intc_set_affinity(struct irq_data *d,
	const struct cpumask *dest, bool force)
	{
	unsigned int irq = d->irq;
	unsigned int shift;
	unsigned long flags;

	local_irq_save(flags);
	if (irq > 0 && irq <= 32) {
	shift = irq - 1;

	if (cpumask_test_cpu(0, dest)) {
	L1_WR_W0(TP1_BASE, MASK_SET, (1UL << shift));
	L1_WR_W0(TP0_BASE, MASK_CLEAR, (1UL << shift));
	next_cpu[irq] = 0;
	} else {
	L1_WR_W0(TP0_BASE, MASK_SET, (1UL << shift));
	L1_WR_W0(TP1_BASE, MASK_CLEAR, (1UL << shift));
	next_cpu[irq] = 1;
	}
	} else if (irq > 32 && irq <= 64) {
	shift = irq - 32 - 1;
	next_cpu[irq] = 0;

	if (cpumask_test_cpu(0, dest)) {
	L1_WR_W1(TP1_BASE, MASK_SET, (1UL << shift));
	L1_WR_W1(TP0_BASE, MASK_CLEAR, (1UL << shift));
	next_cpu[irq] = 0;
	} else {
	L1_WR_W1(TP0_BASE, MASK_SET, (1UL << shift));
	L1_WR_W1(TP1_BASE, MASK_CLEAR, (1UL << shift));
	next_cpu[irq] = 1;
	}
	} else if (irq > 64 && irq <= 96) {
	shift = irq - 64 - 1;
	next_cpu[irq] = 0;

	if (cpumask_test_cpu(0, dest)) {
	L1_WR_W2(TP1_BASE, MASK_SET, (1UL << shift));
	L1_WR_W2(TP0_BASE, MASK_CLEAR, (1UL << shift));
	next_cpu[irq] = 0;
	} else {
	L1_WR_W2(TP0_BASE, MASK_SET, (1UL << shift));
	L1_WR_W2(TP1_BASE, MASK_CLEAR, (1UL << shift));
	next_cpu[irq] = 1;
	}
	} else if (irq > 96 && irq <= 128) {
	shift = irq - 96 - 1;
	next_cpu[irq] = 0;

	if (cpumask_test_cpu(0, dest)) {
	L1_WR_W3(TP1_BASE, MASK_SET, (1UL << shift));
	L1_WR_W3(TP0_BASE, MASK_CLEAR, (1UL << shift));
	next_cpu[irq] = 0;
	} else {
	L1_WR_W3(TP0_BASE, MASK_SET, (1UL << shift));
	L1_WR_W3(TP1_BASE, MASK_CLEAR, (1UL << shift));
	next_cpu[irq] = 1;
	}
	}
	local_irq_restore(flags);
	return 0;
	}
	#endif /* CONFIG_SMP */

	/*
	* THT: These INTC disable the interrupt before calling the IRQ handle_irq
	*/
	static struct irq_chip brcm_intc_type = {
	.name = "BRCM L1",
	.irq_ack = brcm_intc_disable,
	.irq_mask = brcm_intc_disable,
	.irq_mask_ack = brcm_intc_disable,
	.irq_unmask = brcm_intc_enable,
	#ifdef CONFIG_SMP
	.irq_set_affinity = brcm_intc_set_affinity,
	#endif /* CONFIG_SMP */
	NULL
	};

	/*
	* Move the interrupt to the other TP, to balance load (if affinity permits)
	*/
	static void flip_tp(int irq)
	{
	#ifndef CONFIG_BRUNO
	#ifdef CONFIG_SMP
	int tp = smp_processor_id();
	unsigned long local_lev1, remote_lev1;
	unsigned long mask = 1 << ((irq - 1) & 0x1f);

	if (tp == 0) {
	local_lev1 = TP0_BASE;
	remote_lev1 = TP1_BASE;
	} else {
	local_lev1 = TP1_BASE;
	remote_lev1 = TP0_BASE;
	}

	if (cpumask_test_cpu(tp ^ 1, irq_desc[irq].irq_data.affinity)) {
	next_cpu[irq] = tp ^ 1;
	if (irq > 0 && irq <= 32) {
	L1_WR_W0(local_lev1, MASK_SET, mask);
	L1_WR_W0(remote_lev1, MASK_CLEAR, mask);
	}
	if (irq > 32 && irq <= 64) {
	L1_WR_W1(local_lev1, MASK_SET, mask);
	L1_WR_W1(remote_lev1, MASK_CLEAR, mask);
	}
	if (irq > 64 && irq <= 96) {
	L1_WR_W2(local_lev1, MASK_SET, mask);
	L1_WR_W2(remote_lev1, MASK_CLEAR, mask);
	}
	if (irq > 96 && irq <= 128) {
	L1_WR_W3(local_lev1, MASK_SET, mask);
	L1_WR_W3(remote_lev1, MASK_CLEAR, mask);
	}
	}
	#endif /* CONFIG_SMP */
	#endif
	}

	static void brcm_intc_dispatch(unsigned long base)
	{
	u32 pend, shift;

	pend = L1_RD_W0(base, STATUS) & ~L1_RD_W0(base, MASK_STATUS);
	while ((shift = ffs(pend)) != 0) {
	pend ^= (1 << (shift - 1));
	do_IRQ(shift);
	flip_tp(shift);
	}

	pend = L1_RD_W1(base, STATUS) & ~L1_RD_W1(base, MASK_STATUS);
	while ((shift = ffs(pend)) != 0) {
	pend ^= (1 << (shift - 1));
	shift += 32;
	do_IRQ(shift);
	flip_tp(shift);
	}
	pend = L1_RD_W2(base, STATUS) & ~L1_RD_W2(base, MASK_STATUS);
	while ((shift = ffs(pend)) != 0) {
	pend ^= (1 << (shift - 1));
	shift += 64;
	do_IRQ(shift);
	flip_tp(shift);
	}
	pend = L1_RD_W3(base, STATUS) & ~L1_RD_W3(base, MASK_STATUS);
	while ((shift = ffs(pend)) != 0) {
	pend ^= (1 << (shift - 1));
	shift += 96;
	do_IRQ(shift);
	flip_tp(shift);
	}
	}

	/* IRQ2 = L1 interrupt for TP0 */
	static void brcm_mips_int2_dispatch(void)
	{
	clear_c0_status(STATUSF_IP2);
	brcm_intc_dispatch(TP0_BASE);
	set_c0_status(STATUSF_IP2);
	}

	#ifdef CONFIG_SMP
	/* IRQ3 = L1 interrupt for TP1 */
	static void brcm_mips_int3_dispatch(void)
	{
	clear_c0_status(STATUSF_IP3);
	brcm_intc_dispatch(TP1_BASE);
	set_c0_status(STATUSF_IP3);
	}
	#endif

	/***********************************************************************
	* IRQ setup / dispatch
	***********************************************************************/

	void __init arch_init_irq(void)
	{
	int irq;

	mips_cpu_irq_init();

	L1_WR_ALL(W0, MASK_SET, 0xffffffff);
	L1_WR_ALL(W1, MASK_SET, 0xffffffff);
	L1_WR_ALL(W2, MASK_SET, 0xffffffff);
	L1_WR_ALL(W3, MASK_SET, 0xffffffff);

	clear_c0_status(ST0_IE \| ST0_IM);

	/* Set up all L1 IRQs */
	for (irq = 1; irq < BRCM_VIRTIRQ_BASE; irq++)
	#if LINUX_VERSION_CODE >= KERNEL_VERSION(2, 6, 39)
	irq_set_chip_and_handler(irq, &brcm_intc_type,
	handle_level_irq);
	#else
	set_irq_chip_and_handler(irq, &brcm_intc_type,
	handle_level_irq);
	#endif

	#if defined(CONFIG_SMP)
	/* default affinity: 1 (TP0 only) */
	cpumask_clear(irq_default_affinity);
	cpumask_set_cpu(0, irq_default_affinity);
	#endif

	/* enable IRQ2 (this runs on TP0). IRQ3 enabled during TP1 boot. */
	set_c0_status(STATUSF_IP2);

	/* enable non-shared UART interrupts in the L2 */

	#if defined(BCHP_IRQ0_UART_IRQEN_uarta_MASK)
	/* 3548 style - separate register */
	BDEV_WR(BCHP_IRQ0_UART_IRQEN, BCHP_IRQ0_UART_IRQEN_uarta_MASK \|
	BCHP_IRQ0_UART_IRQEN_uartb_MASK \|
	BCHP_IRQ0_UART_IRQEN_uartc_MASK);
	BDEV_WR(BCHP_IRQ0_IRQEN, 0);
	#elif defined(BCHP_IRQ0_IRQEN_uarta_irqen_MASK)
	/* 7405 style - shared with L2 */
	BDEV_WR(BCHP_IRQ0_IRQEN, BCHP_IRQ0_IRQEN_uarta_irqen_MASK
	\| BCHP_IRQ0_IRQEN_uartb_irqen_MASK
	#if defined(BCHP_IRQ0_IRQEN_uartc_irqen_MASK)
	\| BCHP_IRQ0_IRQEN_uartc_irqen_MASK
	#endif
	);
	#endif

	#if defined(BCHP_HIF_INTR2_CPU_MASK_SET)
	/* mask and clear all HIF L2 interrupts */
	BDEV_WR_RB(BCHP_HIF_INTR2_CPU_MASK_SET, 0xffffffff);
	BDEV_WR_RB(BCHP_HIF_INTR2_CPU_CLEAR, 0xffffffff);
	#endif
	}

	asmlinkage void plat_irq_dispatch(void)
	{
	unsigned int pend = ((read_c0_cause() & read_c0_status()) >> 8) & 0xff;
	unsigned int shift;

	while ((shift = ffs(pend)) != 0) {
	shift--;
	pend ^= 1 << shift;
	if (shift == 2)
	brcm_mips_int2_dispatch();
	#ifdef CONFIG_SMP
	else if (unlikely(shift == 3))
	brcm_mips_int3_dispatch();
	#endif
	else
	do_IRQ(MIPS_CPU_IRQ_BASE + shift);
	}
	}

	/***********************************************************************
	* Power management
	***********************************************************************/

	static unsigned long brcm_irq_state[NR_IRQS / 32];

	void brcm_irq_standby_enter(int wake_irq)
	{
	/* save the current state, then mask everything */
	brcm_irq_state[0] = L1_RD_W0(TP0_BASE, MASK_STATUS);
	L1_WR_W0(TP0_BASE, MASK_SET, 0xffffffff);
	brcm_irq_state[1] = L1_RD_W1(TP0_BASE, MASK_STATUS);
	L1_WR_W1(TP0_BASE, MASK_SET, 0xffffffff);
	brcm_irq_state[2] = L1_RD_W2(TP0_BASE, MASK_STATUS);
	L1_WR_W2(TP0_BASE, MASK_SET, 0xffffffff);
	brcm_irq_state[3] = L1_RD_W3(TP0_BASE, MASK_STATUS);
	L1_WR_W3(TP0_BASE, MASK_SET, 0xffffffff);

	/* unmask the wakeup IRQ */
	if (wake_irq > 0 && wake_irq <= 32)
	L1_WR_W0(TP0_BASE, MASK_CLEAR, 1 << (wake_irq - 1));
	else if (wake_irq > 32 && wake_irq <= 64)
	L1_WR_W1(TP0_BASE, MASK_CLEAR, 1 << (wake_irq - 33));
	else if (wake_irq > 64 && wake_irq <= 96)
	L1_WR_W2(TP0_BASE, MASK_CLEAR, 1 << (wake_irq - 65));
	else if (wake_irq > 96 && wake_irq <= 128)
	L1_WR_W3(TP0_BASE, MASK_CLEAR, 1 << (wake_irq - 97));
	}

	void brcm_irq_standby_exit(void)
	{
	/* restore the saved L1 state */
	L1_WR_W0(TP0_BASE, MASK_SET, 0xffffffff);
	L1_WR_W0(TP0_BASE, MASK_CLEAR, ~brcm_irq_state[0]);
	L1_WR_W1(TP0_BASE, MASK_SET, 0xffffffff);
	L1_WR_W1(TP0_BASE, MASK_CLEAR, ~brcm_irq_state[1]);
	L1_WR_W2(TP0_BASE, MASK_SET, 0xffffffff);
	L1_WR_W2(TP0_BASE, MASK_CLEAR, ~brcm_irq_state[2]);
	L1_WR_W3(TP0_BASE, MASK_SET, 0xffffffff);
	L1_WR_W3(TP0_BASE, MASK_CLEAR, ~brcm_irq_state[3]);
	}