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1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 | // SPDX-License-Identifier: GPL-2.0-only /* * linux/arch/arm/mach-footbridge/irq.c * * Copyright (C) 1996-2000 Russell King * * Changelog: * 22-Aug-1998 RMK Restructured IRQ routines * 03-Sep-1998 PJB Merged CATS support * 20-Jan-1998 RMK Started merge of EBSA286, CATS and NetWinder * 26-Jan-1999 PJB Don't use IACK on CATS * 16-Mar-1999 RMK Added autodetect of ISA PICs */ #include <linux/ioport.h> #include <linux/interrupt.h> #include <linux/list.h> #include <linux/init.h> #include <linux/io.h> #include <linux/spinlock.h> #include <asm/mach/irq.h> #include <mach/hardware.h> #include <asm/hardware/dec21285.h> #include <asm/irq.h> #include <asm/mach-types.h> #include "common.h" static void isa_mask_pic_lo_irq(struct irq_data *d) { unsigned int mask = 1 << (d->irq & 7); outb(inb(PIC_MASK_LO) | mask, PIC_MASK_LO); } static void isa_ack_pic_lo_irq(struct irq_data *d) { unsigned int mask = 1 << (d->irq & 7); outb(inb(PIC_MASK_LO) | mask, PIC_MASK_LO); outb(0x20, PIC_LO); } static void isa_unmask_pic_lo_irq(struct irq_data *d) { unsigned int mask = 1 << (d->irq & 7); outb(inb(PIC_MASK_LO) & ~mask, PIC_MASK_LO); } static struct irq_chip isa_lo_chip = { .irq_ack = isa_ack_pic_lo_irq, .irq_mask = isa_mask_pic_lo_irq, .irq_unmask = isa_unmask_pic_lo_irq, }; static void isa_mask_pic_hi_irq(struct irq_data *d) { unsigned int mask = 1 << (d->irq & 7); outb(inb(PIC_MASK_HI) | mask, PIC_MASK_HI); } static void isa_ack_pic_hi_irq(struct irq_data *d) { unsigned int mask = 1 << (d->irq & 7); outb(inb(PIC_MASK_HI) | mask, PIC_MASK_HI); outb(0x62, PIC_LO); outb(0x20, PIC_HI); } static void isa_unmask_pic_hi_irq(struct irq_data *d) { unsigned int mask = 1 << (d->irq & 7); outb(inb(PIC_MASK_HI) & ~mask, PIC_MASK_HI); } static struct irq_chip isa_hi_chip = { .irq_ack = isa_ack_pic_hi_irq, .irq_mask = isa_mask_pic_hi_irq, .irq_unmask = isa_unmask_pic_hi_irq, }; static void isa_irq_handler(struct irq_desc *desc) { unsigned int isa_irq = *(unsigned char *)PCIIACK_BASE; if (isa_irq < _ISA_IRQ(0) || isa_irq >= _ISA_IRQ(16)) { do_bad_IRQ(desc); return; } generic_handle_irq(isa_irq); } static struct resource pic1_resource = { .name = "pic1", .start = 0x20, .end = 0x3f, }; static struct resource pic2_resource = { .name = "pic2", .start = 0xa0, .end = 0xbf, }; void __init isa_init_irq(unsigned int host_irq) { unsigned int irq; /* * Setup, and then probe for an ISA PIC * If the PIC is not there, then we * ignore the PIC. */ outb(0x11, PIC_LO); outb(_ISA_IRQ(0), PIC_MASK_LO); /* IRQ number */ outb(0x04, PIC_MASK_LO); /* Slave on Ch2 */ outb(0x01, PIC_MASK_LO); /* x86 */ outb(0xf5, PIC_MASK_LO); /* pattern: 11110101 */ outb(0x11, PIC_HI); outb(_ISA_IRQ(8), PIC_MASK_HI); /* IRQ number */ outb(0x02, PIC_MASK_HI); /* Slave on Ch1 */ outb(0x01, PIC_MASK_HI); /* x86 */ outb(0xfa, PIC_MASK_HI); /* pattern: 11111010 */ outb(0x0b, PIC_LO); outb(0x0b, PIC_HI); if (inb(PIC_MASK_LO) == 0xf5 && inb(PIC_MASK_HI) == 0xfa) { outb(0xff, PIC_MASK_LO);/* mask all IRQs */ outb(0xff, PIC_MASK_HI);/* mask all IRQs */ } else { printk(KERN_INFO "IRQ: ISA PIC not found\n"); host_irq = (unsigned int)-1; } if (host_irq != (unsigned int)-1) { for (irq = _ISA_IRQ(0); irq < _ISA_IRQ(8); irq++) { irq_set_chip_and_handler(irq, &isa_lo_chip, handle_level_irq); irq_clear_status_flags(irq, IRQ_NOREQUEST | IRQ_NOPROBE); } for (irq = _ISA_IRQ(8); irq < _ISA_IRQ(16); irq++) { irq_set_chip_and_handler(irq, &isa_hi_chip, handle_level_irq); irq_clear_status_flags(irq, IRQ_NOREQUEST | IRQ_NOPROBE); } request_resource(&ioport_resource, &pic1_resource); request_resource(&ioport_resource, &pic2_resource); irq = IRQ_ISA_CASCADE; if (request_irq(irq, no_action, 0, "cascade", NULL)) pr_err("Failed to request irq %u (cascade)\n", irq); irq_set_chained_handler(host_irq, isa_irq_handler); /* * On the NetWinder, don't automatically * enable ISA IRQ11 when it is requested. * There appears to be a missing pull-up * resistor on this line. */ if (machine_is_netwinder()) irq_modify_status(_ISA_IRQ(11), IRQ_NOREQUEST | IRQ_NOPROBE, IRQ_NOAUTOEN); } } |