11da177e4SLinus Torvalds /* 21da177e4SLinus Torvalds * linux/arch/arm/mach-footbridge/irq.c 31da177e4SLinus Torvalds * 41da177e4SLinus Torvalds * Copyright (C) 1996-2000 Russell King 51da177e4SLinus Torvalds * 61da177e4SLinus Torvalds * This program is free software; you can redistribute it and/or modify 71da177e4SLinus Torvalds * it under the terms of the GNU General Public License version 2 as 81da177e4SLinus Torvalds * published by the Free Software Foundation. 91da177e4SLinus Torvalds * 101da177e4SLinus Torvalds * Changelog: 111da177e4SLinus Torvalds * 22-Aug-1998 RMK Restructured IRQ routines 121da177e4SLinus Torvalds * 03-Sep-1998 PJB Merged CATS support 131da177e4SLinus Torvalds * 20-Jan-1998 RMK Started merge of EBSA286, CATS and NetWinder 141da177e4SLinus Torvalds * 26-Jan-1999 PJB Don't use IACK on CATS 151da177e4SLinus Torvalds * 16-Mar-1999 RMK Added autodetect of ISA PICs 161da177e4SLinus Torvalds */ 171da177e4SLinus Torvalds #include <linux/ioport.h> 181da177e4SLinus Torvalds #include <linux/interrupt.h> 191da177e4SLinus Torvalds #include <linux/list.h> 201da177e4SLinus Torvalds #include <linux/init.h> 21fced80c7SRussell King #include <linux/io.h> 2270d13e08SRussell King #include <linux/spinlock.h> 231da177e4SLinus Torvalds 241da177e4SLinus Torvalds #include <asm/mach/irq.h> 251da177e4SLinus Torvalds 26a09e64fbSRussell King #include <mach/hardware.h> 271da177e4SLinus Torvalds #include <asm/hardware/dec21285.h> 281da177e4SLinus Torvalds #include <asm/irq.h> 291da177e4SLinus Torvalds #include <asm/mach-types.h> 301da177e4SLinus Torvalds 31*39ebfd3fSBen Dooks #include "common.h" 32*39ebfd3fSBen Dooks 331da177e4SLinus Torvalds static void isa_mask_pic_lo_irq(unsigned int irq) 341da177e4SLinus Torvalds { 351da177e4SLinus Torvalds unsigned int mask = 1 << (irq & 7); 361da177e4SLinus Torvalds 371da177e4SLinus Torvalds outb(inb(PIC_MASK_LO) | mask, PIC_MASK_LO); 381da177e4SLinus Torvalds } 391da177e4SLinus Torvalds 401da177e4SLinus Torvalds static void isa_ack_pic_lo_irq(unsigned int irq) 411da177e4SLinus Torvalds { 421da177e4SLinus Torvalds unsigned int mask = 1 << (irq & 7); 431da177e4SLinus Torvalds 441da177e4SLinus Torvalds outb(inb(PIC_MASK_LO) | mask, PIC_MASK_LO); 451da177e4SLinus Torvalds outb(0x20, PIC_LO); 461da177e4SLinus Torvalds } 471da177e4SLinus Torvalds 481da177e4SLinus Torvalds static void isa_unmask_pic_lo_irq(unsigned int irq) 491da177e4SLinus Torvalds { 501da177e4SLinus Torvalds unsigned int mask = 1 << (irq & 7); 511da177e4SLinus Torvalds 521da177e4SLinus Torvalds outb(inb(PIC_MASK_LO) & ~mask, PIC_MASK_LO); 531da177e4SLinus Torvalds } 541da177e4SLinus Torvalds 5510dd5ce2SRussell King static struct irq_chip isa_lo_chip = { 561da177e4SLinus Torvalds .ack = isa_ack_pic_lo_irq, 571da177e4SLinus Torvalds .mask = isa_mask_pic_lo_irq, 581da177e4SLinus Torvalds .unmask = isa_unmask_pic_lo_irq, 591da177e4SLinus Torvalds }; 601da177e4SLinus Torvalds 611da177e4SLinus Torvalds static void isa_mask_pic_hi_irq(unsigned int irq) 621da177e4SLinus Torvalds { 631da177e4SLinus Torvalds unsigned int mask = 1 << (irq & 7); 641da177e4SLinus Torvalds 651da177e4SLinus Torvalds outb(inb(PIC_MASK_HI) | mask, PIC_MASK_HI); 661da177e4SLinus Torvalds } 671da177e4SLinus Torvalds 681da177e4SLinus Torvalds static void isa_ack_pic_hi_irq(unsigned int irq) 691da177e4SLinus Torvalds { 701da177e4SLinus Torvalds unsigned int mask = 1 << (irq & 7); 711da177e4SLinus Torvalds 721da177e4SLinus Torvalds outb(inb(PIC_MASK_HI) | mask, PIC_MASK_HI); 731da177e4SLinus Torvalds outb(0x62, PIC_LO); 741da177e4SLinus Torvalds outb(0x20, PIC_HI); 751da177e4SLinus Torvalds } 761da177e4SLinus Torvalds 771da177e4SLinus Torvalds static void isa_unmask_pic_hi_irq(unsigned int irq) 781da177e4SLinus Torvalds { 791da177e4SLinus Torvalds unsigned int mask = 1 << (irq & 7); 801da177e4SLinus Torvalds 811da177e4SLinus Torvalds outb(inb(PIC_MASK_HI) & ~mask, PIC_MASK_HI); 821da177e4SLinus Torvalds } 831da177e4SLinus Torvalds 8410dd5ce2SRussell King static struct irq_chip isa_hi_chip = { 851da177e4SLinus Torvalds .ack = isa_ack_pic_hi_irq, 861da177e4SLinus Torvalds .mask = isa_mask_pic_hi_irq, 871da177e4SLinus Torvalds .unmask = isa_unmask_pic_hi_irq, 881da177e4SLinus Torvalds }; 891da177e4SLinus Torvalds 901da177e4SLinus Torvalds static void 9110dd5ce2SRussell King isa_irq_handler(unsigned int irq, struct irq_desc *desc) 921da177e4SLinus Torvalds { 931da177e4SLinus Torvalds unsigned int isa_irq = *(unsigned char *)PCIIACK_BASE; 941da177e4SLinus Torvalds 951da177e4SLinus Torvalds if (isa_irq < _ISA_IRQ(0) || isa_irq >= _ISA_IRQ(16)) { 960cd61b68SLinus Torvalds do_bad_IRQ(isa_irq, desc); 971da177e4SLinus Torvalds return; 981da177e4SLinus Torvalds } 991da177e4SLinus Torvalds 100d8aa0251SDmitry Baryshkov generic_handle_irq(isa_irq); 1011da177e4SLinus Torvalds } 1021da177e4SLinus Torvalds 103020732adSRussell King static struct irqaction irq_cascade = { 104020732adSRussell King .handler = no_action, 105020732adSRussell King .name = "cascade", 106020732adSRussell King }; 107020732adSRussell King 108020732adSRussell King static struct resource pic1_resource = { 109020732adSRussell King .name = "pic1", 110020732adSRussell King .start = 0x20, 111020732adSRussell King .end = 0x3f, 112020732adSRussell King }; 113020732adSRussell King 114020732adSRussell King static struct resource pic2_resource = { 115020732adSRussell King .name = "pic2", 116020732adSRussell King .start = 0xa0, 117020732adSRussell King .end = 0xbf, 118020732adSRussell King }; 1191da177e4SLinus Torvalds 1201da177e4SLinus Torvalds void __init isa_init_irq(unsigned int host_irq) 1211da177e4SLinus Torvalds { 1221da177e4SLinus Torvalds unsigned int irq; 1231da177e4SLinus Torvalds 1241da177e4SLinus Torvalds /* 1251da177e4SLinus Torvalds * Setup, and then probe for an ISA PIC 1261da177e4SLinus Torvalds * If the PIC is not there, then we 1271da177e4SLinus Torvalds * ignore the PIC. 1281da177e4SLinus Torvalds */ 1291da177e4SLinus Torvalds outb(0x11, PIC_LO); 1301da177e4SLinus Torvalds outb(_ISA_IRQ(0), PIC_MASK_LO); /* IRQ number */ 1311da177e4SLinus Torvalds outb(0x04, PIC_MASK_LO); /* Slave on Ch2 */ 1321da177e4SLinus Torvalds outb(0x01, PIC_MASK_LO); /* x86 */ 1331da177e4SLinus Torvalds outb(0xf5, PIC_MASK_LO); /* pattern: 11110101 */ 1341da177e4SLinus Torvalds 1351da177e4SLinus Torvalds outb(0x11, PIC_HI); 1361da177e4SLinus Torvalds outb(_ISA_IRQ(8), PIC_MASK_HI); /* IRQ number */ 1371da177e4SLinus Torvalds outb(0x02, PIC_MASK_HI); /* Slave on Ch1 */ 1381da177e4SLinus Torvalds outb(0x01, PIC_MASK_HI); /* x86 */ 1391da177e4SLinus Torvalds outb(0xfa, PIC_MASK_HI); /* pattern: 11111010 */ 1401da177e4SLinus Torvalds 1411da177e4SLinus Torvalds outb(0x0b, PIC_LO); 1421da177e4SLinus Torvalds outb(0x0b, PIC_HI); 1431da177e4SLinus Torvalds 1441da177e4SLinus Torvalds if (inb(PIC_MASK_LO) == 0xf5 && inb(PIC_MASK_HI) == 0xfa) { 1451da177e4SLinus Torvalds outb(0xff, PIC_MASK_LO);/* mask all IRQs */ 1461da177e4SLinus Torvalds outb(0xff, PIC_MASK_HI);/* mask all IRQs */ 1471da177e4SLinus Torvalds } else { 1481da177e4SLinus Torvalds printk(KERN_INFO "IRQ: ISA PIC not found\n"); 1491da177e4SLinus Torvalds host_irq = (unsigned int)-1; 1501da177e4SLinus Torvalds } 1511da177e4SLinus Torvalds 1521da177e4SLinus Torvalds if (host_irq != (unsigned int)-1) { 1531da177e4SLinus Torvalds for (irq = _ISA_IRQ(0); irq < _ISA_IRQ(8); irq++) { 1541da177e4SLinus Torvalds set_irq_chip(irq, &isa_lo_chip); 15510dd5ce2SRussell King set_irq_handler(irq, handle_level_irq); 1561da177e4SLinus Torvalds set_irq_flags(irq, IRQF_VALID | IRQF_PROBE); 1571da177e4SLinus Torvalds } 1581da177e4SLinus Torvalds 1591da177e4SLinus Torvalds for (irq = _ISA_IRQ(8); irq < _ISA_IRQ(16); irq++) { 1601da177e4SLinus Torvalds set_irq_chip(irq, &isa_hi_chip); 16110dd5ce2SRussell King set_irq_handler(irq, handle_level_irq); 1621da177e4SLinus Torvalds set_irq_flags(irq, IRQF_VALID | IRQF_PROBE); 1631da177e4SLinus Torvalds } 1641da177e4SLinus Torvalds 1651da177e4SLinus Torvalds request_resource(&ioport_resource, &pic1_resource); 1661da177e4SLinus Torvalds request_resource(&ioport_resource, &pic2_resource); 1671da177e4SLinus Torvalds setup_irq(IRQ_ISA_CASCADE, &irq_cascade); 1681da177e4SLinus Torvalds 1691da177e4SLinus Torvalds set_irq_chained_handler(host_irq, isa_irq_handler); 1701da177e4SLinus Torvalds 1711da177e4SLinus Torvalds /* 1721da177e4SLinus Torvalds * On the NetWinder, don't automatically 1731da177e4SLinus Torvalds * enable ISA IRQ11 when it is requested. 1741da177e4SLinus Torvalds * There appears to be a missing pull-up 1751da177e4SLinus Torvalds * resistor on this line. 1761da177e4SLinus Torvalds */ 1771da177e4SLinus Torvalds if (machine_is_netwinder()) 1781da177e4SLinus Torvalds set_irq_flags(_ISA_IRQ(11), IRQF_VALID | 1791da177e4SLinus Torvalds IRQF_PROBE | IRQF_NOAUTOEN); 1801da177e4SLinus Torvalds } 1811da177e4SLinus Torvalds } 1821da177e4SLinus Torvalds 1831da177e4SLinus Torvalds 184