1 /* 2 * DEC I/O ASIC interrupts. 3 * 4 * Copyright (c) 2002, 2003 Maciej W. Rozycki 5 * 6 * This program is free software; you can redistribute it and/or 7 * modify it under the terms of the GNU General Public License 8 * as published by the Free Software Foundation; either version 9 * 2 of the License, or (at your option) any later version. 10 */ 11 12 #include <linux/init.h> 13 #include <linux/irq.h> 14 #include <linux/types.h> 15 16 #include <asm/dec/ioasic.h> 17 #include <asm/dec/ioasic_addrs.h> 18 #include <asm/dec/ioasic_ints.h> 19 20 static int ioasic_irq_base; 21 22 static void unmask_ioasic_irq(struct irq_data *d) 23 { 24 u32 simr; 25 26 simr = ioasic_read(IO_REG_SIMR); 27 simr |= (1 << (d->irq - ioasic_irq_base)); 28 ioasic_write(IO_REG_SIMR, simr); 29 } 30 31 static void mask_ioasic_irq(struct irq_data *d) 32 { 33 u32 simr; 34 35 simr = ioasic_read(IO_REG_SIMR); 36 simr &= ~(1 << (d->irq - ioasic_irq_base)); 37 ioasic_write(IO_REG_SIMR, simr); 38 } 39 40 static void ack_ioasic_irq(struct irq_data *d) 41 { 42 mask_ioasic_irq(d); 43 fast_iob(); 44 } 45 46 static struct irq_chip ioasic_irq_type = { 47 .name = "IO-ASIC", 48 .irq_ack = ack_ioasic_irq, 49 .irq_mask = mask_ioasic_irq, 50 .irq_mask_ack = ack_ioasic_irq, 51 .irq_unmask = unmask_ioasic_irq, 52 }; 53 54 static struct irq_chip ioasic_dma_irq_type = { 55 .name = "IO-ASIC-DMA", 56 .irq_ack = ack_ioasic_irq, 57 .irq_mask = mask_ioasic_irq, 58 .irq_mask_ack = ack_ioasic_irq, 59 .irq_unmask = unmask_ioasic_irq, 60 }; 61 62 void __init init_ioasic_irqs(int base) 63 { 64 int i; 65 66 /* Mask interrupts. */ 67 ioasic_write(IO_REG_SIMR, 0); 68 fast_iob(); 69 70 for (i = base; i < base + IO_INR_DMA; i++) 71 irq_set_chip_and_handler(i, &ioasic_irq_type, 72 handle_level_irq); 73 for (; i < base + IO_IRQ_LINES; i++) 74 irq_set_chip(i, &ioasic_dma_irq_type); 75 76 ioasic_irq_base = base; 77 } 78