diff options
Diffstat (limited to 'arch/frv/kernel/irq.c')
| -rw-r--r-- | arch/frv/kernel/irq.c | 159 |
1 files changed, 159 insertions, 0 deletions
diff --git a/arch/frv/kernel/irq.c b/arch/frv/kernel/irq.c new file mode 100644 index 000000000..2239346fa --- /dev/null +++ b/arch/frv/kernel/irq.c @@ -0,0 +1,159 @@ +/* irq.c: FRV IRQ handling + * + * Copyright (C) 2003, 2004, 2006 Red Hat, Inc. All Rights Reserved. + * Written by David Howells (dhowells@redhat.com) + * + * This program is free software; you can redistribute it and/or + * modify it under the terms of the GNU General Public License + * as published by the Free Software Foundation; either version + * 2 of the License, or (at your option) any later version. + */ + +#include <linux/ptrace.h> +#include <linux/errno.h> +#include <linux/signal.h> +#include <linux/sched.h> +#include <linux/ioport.h> +#include <linux/interrupt.h> +#include <linux/timex.h> +#include <linux/random.h> +#include <linux/init.h> +#include <linux/kernel_stat.h> +#include <linux/irq.h> +#include <linux/proc_fs.h> +#include <linux/seq_file.h> +#include <linux/module.h> +#include <linux/bitops.h> + +#include <linux/atomic.h> +#include <asm/io.h> +#include <asm/smp.h> +#include <asm/uaccess.h> +#include <asm/pgalloc.h> +#include <asm/delay.h> +#include <asm/irq.h> +#include <asm/irc-regs.h> +#include <asm/gdb-stub.h> + +#define set_IRR(N,A,B,C,D) __set_IRR(N, (A << 28) | (B << 24) | (C << 20) | (D << 16)) + +extern void __init fpga_init(void); +#ifdef CONFIG_FUJITSU_MB93493 +extern void __init mb93493_init(void); +#endif + +#define __reg16(ADDR) (*(volatile unsigned short *)(ADDR)) + +atomic_t irq_err_count; + +int arch_show_interrupts(struct seq_file *p, int prec) +{ + seq_printf(p, "%*s: ", prec, "ERR"); + seq_printf(p, "%10u\n", atomic_read(&irq_err_count)); + return 0; +} + +/* + * on-CPU PIC operations + */ +static void frv_cpupic_ack(struct irq_data *d) +{ + __clr_RC(d->irq); + __clr_IRL(); +} + +static void frv_cpupic_mask(struct irq_data *d) +{ + __set_MASK(d->irq); +} + +static void frv_cpupic_mask_ack(struct irq_data *d) +{ + __set_MASK(d->irq); + __clr_RC(d->irq); + __clr_IRL(); +} + +static void frv_cpupic_unmask(struct irq_data *d) +{ + __clr_MASK(d->irq); +} + +static struct irq_chip frv_cpu_pic = { + .name = "cpu", + .irq_ack = frv_cpupic_ack, + .irq_mask = frv_cpupic_mask, + .irq_mask_ack = frv_cpupic_mask_ack, + .irq_unmask = frv_cpupic_unmask, +}; + +/* + * handles all normal device IRQs + * - registers are referred to by the __frame variable (GR28) + * - IRQ distribution is complicated in this arch because of the many PICs, the + * way they work and the way they cascade + */ +asmlinkage void do_IRQ(void) +{ + irq_enter(); + generic_handle_irq(__get_IRL()); + irq_exit(); +} + +/* + * handles all NMIs when not co-opted by the debugger + * - registers are referred to by the __frame variable (GR28) + */ +asmlinkage void do_NMI(void) +{ +} + +/* + * initialise the interrupt system + */ +void __init init_IRQ(void) +{ + int level; + + for (level = 1; level <= 14; level++) + irq_set_chip_and_handler(level, &frv_cpu_pic, + handle_level_irq); + + irq_set_handler(IRQ_CPU_TIMER0, handle_edge_irq); + + /* set the trigger levels for internal interrupt sources + * - timers all falling-edge + * - ERR0 is rising-edge + * - all others are high-level + */ + __set_IITMR(0, 0x003f0000); /* DMA0-3, TIMER0-2 */ + __set_IITMR(1, 0x20000000); /* ERR0-1, UART0-1, DMA4-7 */ + + /* route internal interrupts */ + set_IRR(4, IRQ_DMA3_LEVEL, IRQ_DMA2_LEVEL, IRQ_DMA1_LEVEL, + IRQ_DMA0_LEVEL); + set_IRR(5, 0, IRQ_TIMER2_LEVEL, IRQ_TIMER1_LEVEL, IRQ_TIMER0_LEVEL); + set_IRR(6, IRQ_GDBSTUB_LEVEL, IRQ_GDBSTUB_LEVEL, + IRQ_UART1_LEVEL, IRQ_UART0_LEVEL); + set_IRR(7, IRQ_DMA7_LEVEL, IRQ_DMA6_LEVEL, IRQ_DMA5_LEVEL, + IRQ_DMA4_LEVEL); + + /* route external interrupts */ + set_IRR(2, IRQ_XIRQ7_LEVEL, IRQ_XIRQ6_LEVEL, IRQ_XIRQ5_LEVEL, + IRQ_XIRQ4_LEVEL); + set_IRR(3, IRQ_XIRQ3_LEVEL, IRQ_XIRQ2_LEVEL, IRQ_XIRQ1_LEVEL, + IRQ_XIRQ0_LEVEL); + +#if defined(CONFIG_MB93091_VDK) + __set_TM1(0x55550000); /* XIRQ7-0 all active low */ +#elif defined(CONFIG_MB93093_PDK) + __set_TM1(0x15550000); /* XIRQ7 active high, 6-0 all active low */ +#else +#error dont know external IRQ trigger levels for this setup +#endif + + fpga_init(); +#ifdef CONFIG_FUJITSU_MB93493 + mb93493_init(); +#endif +} |