static void isa_irq_handler(unsigned int irq, 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(isa_irq, desc); return; } generic_handle_irq(isa_irq); }
static void isa_irq_handler(unsigned int irq, struct irqdesc *desc, struct pt_regs *regs) { unsigned int isa_irq = *(unsigned char *)PCIIACK_BASE; if (isa_irq < _ISA_IRQ(0) || isa_irq >= _ISA_IRQ(16)) { do_bad_IRQ(isa_irq, desc, regs); return; } desc = irq_desc + isa_irq; desc->handle(isa_irq, desc, regs); }
void __init isa_init_irq(unsigned int host_irq) { unsigned int irq; outb(0x11, PIC_LO); outb(_ISA_IRQ(0), PIC_MASK_LO); outb(0x04, PIC_MASK_LO); outb(0x01, PIC_MASK_LO); outb(0xf5, PIC_MASK_LO); outb(0x11, PIC_HI); outb(_ISA_IRQ(8), PIC_MASK_HI); outb(0x02, PIC_MASK_HI); outb(0x01, PIC_MASK_HI); outb(0xfa, PIC_MASK_HI); outb(0x0b, PIC_LO); outb(0x0b, PIC_HI); if (inb(PIC_MASK_LO) == 0xf5 && inb(PIC_MASK_HI) == 0xfa) { outb(0xff, PIC_MASK_LO); outb(0xff, PIC_MASK_HI); } 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); set_irq_flags(irq, IRQF_VALID | IRQF_PROBE); } for (irq = _ISA_IRQ(8); irq < _ISA_IRQ(16); irq++) { irq_set_chip_and_handler(irq, &isa_hi_chip, handle_level_irq); set_irq_flags(irq, IRQF_VALID | IRQF_PROBE); } request_resource(&ioport_resource, &pic1_resource); request_resource(&ioport_resource, &pic2_resource); setup_irq(IRQ_ISA_CASCADE, &irq_cascade); irq_set_chained_handler(host_irq, isa_irq_handler); if (machine_is_netwinder()) set_irq_flags(_ISA_IRQ(11), IRQF_VALID | IRQF_PROBE | IRQF_NOAUTOEN); } }
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); set_irq_flags(irq, IRQF_VALID | IRQF_PROBE); } for (irq = _ISA_IRQ(8); irq < _ISA_IRQ(16); irq++) { irq_set_chip_and_handler(irq, &isa_hi_chip, handle_level_irq); set_irq_flags(irq, IRQF_VALID | IRQF_PROBE); } request_resource(&ioport_resource, &pic1_resource); request_resource(&ioport_resource, &pic2_resource); setup_irq(IRQ_ISA_CASCADE, &irq_cascade); 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()) set_irq_flags(_ISA_IRQ(11), IRQF_VALID | IRQF_PROBE | IRQF_NOAUTOEN); } }