diff options
Diffstat (limited to 'arch/ppc/syslib/i8259.c')
| -rw-r--r-- | arch/ppc/syslib/i8259.c | 213 |
1 files changed, 0 insertions, 213 deletions
diff --git a/arch/ppc/syslib/i8259.c b/arch/ppc/syslib/i8259.c deleted file mode 100644 index 559f27c..0000000 --- a/arch/ppc/syslib/i8259.c +++ /dev/null @@ -1,213 +0,0 @@ -/* - * i8259 interrupt controller driver. - * - * 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/init.h> -#include <linux/ioport.h> -#include <linux/interrupt.h> -#include <asm/io.h> -#include <asm/i8259.h> - -static volatile void __iomem *pci_intack; /* RO, gives us the irq vector */ - -static unsigned char cached_8259[2] = { 0xff, 0xff }; -#define cached_A1 (cached_8259[0]) -#define cached_21 (cached_8259[1]) - -static DEFINE_SPINLOCK(i8259_lock); - -static int i8259_pic_irq_offset; - -/* - * Acknowledge the IRQ using either the PCI host bridge's interrupt - * acknowledge feature or poll. How i8259_init() is called determines - * which is called. It should be noted that polling is broken on some - * IBM and Motorola PReP boxes so we must use the int-ack feature on them. - */ -int i8259_irq(void) -{ - int irq; - - spin_lock(&i8259_lock); - - /* Either int-ack or poll for the IRQ */ - if (pci_intack) - irq = readb(pci_intack); - else { - /* Perform an interrupt acknowledge cycle on controller 1. */ - outb(0x0C, 0x20); /* prepare for poll */ - irq = inb(0x20) & 7; - if (irq == 2 ) { - /* - * Interrupt is cascaded so perform interrupt - * acknowledge on controller 2. - */ - outb(0x0C, 0xA0); /* prepare for poll */ - irq = (inb(0xA0) & 7) + 8; - } - } - - if (irq == 7) { - /* - * This may be a spurious interrupt. - * - * Read the interrupt status register (ISR). If the most - * significant bit is not set then there is no valid - * interrupt. - */ - if (!pci_intack) - outb(0x0B, 0x20); /* ISR register */ - if(~inb(0x20) & 0x80) - irq = -1; - } - - spin_unlock(&i8259_lock); - return irq + i8259_pic_irq_offset; -} - -static void i8259_mask_and_ack_irq(unsigned int irq_nr) -{ - unsigned long flags; - - spin_lock_irqsave(&i8259_lock, flags); - irq_nr -= i8259_pic_irq_offset; - if (irq_nr > 7) { - cached_A1 |= 1 << (irq_nr-8); - inb(0xA1); /* DUMMY */ - outb(cached_A1, 0xA1); - outb(0x20, 0xA0); /* Non-specific EOI */ - outb(0x20, 0x20); /* Non-specific EOI to cascade */ - } else { - cached_21 |= 1 << irq_nr; - inb(0x21); /* DUMMY */ - outb(cached_21, 0x21); - outb(0x20, 0x20); /* Non-specific EOI */ - } - spin_unlock_irqrestore(&i8259_lock, flags); -} - -static void i8259_set_irq_mask(int irq_nr) -{ - outb(cached_A1,0xA1); - outb(cached_21,0x21); -} - -static void i8259_mask_irq(unsigned int irq_nr) -{ - unsigned long flags; - - spin_lock_irqsave(&i8259_lock, flags); - irq_nr -= i8259_pic_irq_offset; - if (irq_nr < 8) - cached_21 |= 1 << irq_nr; - else - cached_A1 |= 1 << (irq_nr-8); - i8259_set_irq_mask(irq_nr); - spin_unlock_irqrestore(&i8259_lock, flags); -} - -static void i8259_unmask_irq(unsigned int irq_nr) -{ - unsigned long flags; - - spin_lock_irqsave(&i8259_lock, flags); - irq_nr -= i8259_pic_irq_offset; - if (irq_nr < 8) - cached_21 &= ~(1 << irq_nr); - else - cached_A1 &= ~(1 << (irq_nr-8)); - i8259_set_irq_mask(irq_nr); - spin_unlock_irqrestore(&i8259_lock, flags); -} - -static struct irq_chip i8259_pic = { - .typename = " i8259 ", - .mask = i8259_mask_irq, - .disable = i8259_mask_irq, - .unmask = i8259_unmask_irq, - .mask_ack = i8259_mask_and_ack_irq, -}; - -static struct resource pic1_iores = { - .name = "8259 (master)", - .start = 0x20, - .end = 0x21, - .flags = IORESOURCE_BUSY, -}; - -static struct resource pic2_iores = { - .name = "8259 (slave)", - .start = 0xa0, - .end = 0xa1, - .flags = IORESOURCE_BUSY, -}; - -static struct resource pic_edgectrl_iores = { - .name = "8259 edge control", - .start = 0x4d0, - .end = 0x4d1, - .flags = IORESOURCE_BUSY, -}; - -static struct irqaction i8259_irqaction = { - .handler = no_action, - .flags = IRQF_DISABLED, - .mask = CPU_MASK_NONE, - .name = "82c59 secondary cascade", -}; - -/* - * i8259_init() - * intack_addr - PCI interrupt acknowledge (real) address which will return - * the active irq from the 8259 - */ -void __init i8259_init(unsigned long intack_addr, int offset) -{ - unsigned long flags; - int i; - - spin_lock_irqsave(&i8259_lock, flags); - i8259_pic_irq_offset = offset; - - /* init master interrupt controller */ - outb(0x11, 0x20); /* Start init sequence */ - outb(0x00, 0x21); /* Vector base */ - outb(0x04, 0x21); /* edge tiggered, Cascade (slave) on IRQ2 */ - outb(0x01, 0x21); /* Select 8086 mode */ - - /* init slave interrupt controller */ - outb(0x11, 0xA0); /* Start init sequence */ - outb(0x08, 0xA1); /* Vector base */ - outb(0x02, 0xA1); /* edge triggered, Cascade (slave) on IRQ2 */ - outb(0x01, 0xA1); /* Select 8086 mode */ - - /* always read ISR */ - outb(0x0B, 0x20); - outb(0x0B, 0xA0); - - /* Mask all interrupts */ - outb(cached_A1, 0xA1); - outb(cached_21, 0x21); - - spin_unlock_irqrestore(&i8259_lock, flags); - - for (i = 0; i < NUM_ISA_INTERRUPTS; ++i) { - set_irq_chip_and_handler(offset + i, &i8259_pic, - handle_level_irq); - irq_desc[offset + i].status |= IRQ_LEVEL; - } - - /* reserve our resources */ - setup_irq(offset + 2, &i8259_irqaction); - request_resource(&ioport_resource, &pic1_iores); - request_resource(&ioport_resource, &pic2_iores); - request_resource(&ioport_resource, &pic_edgectrl_iores); - - if (intack_addr != 0) - pci_intack = ioremap(intack_addr, 1); - -} |
