diff options
Diffstat (limited to 'src/drivers')
| -rw-r--r-- | src/drivers/pc80/i8259.c | 75 |
1 files changed, 39 insertions, 36 deletions
diff --git a/src/drivers/pc80/i8259.c b/src/drivers/pc80/i8259.c index 6f97c56dcf..2ad46e4070 100644 --- a/src/drivers/pc80/i8259.c +++ b/src/drivers/pc80/i8259.c @@ -2,6 +2,7 @@ * This file is part of the coreboot project. * * Copyright (C) 2009 coresystems GmbH + * Copyright (C) 2013 Sage Electronic Engineering, LLC. * * 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 @@ -21,40 +22,44 @@ #include <pc80/i8259.h> #include <console/console.h> -#define MASTER_PIC_ICW1 0x20 -#define SLAVE_PIC_ICW1 0xa0 -#define ICW_SELECT (1 << 4) -#define OCW_SELECT (0 << 4) -#define ADI (1 << 2) -#define SNGL (1 << 1) -#define IC4 (1 << 0) - -#define MASTER_PIC_ICW2 0x21 -#define SLAVE_PIC_ICW2 0xa1 -#define INT_VECTOR_MASTER 0x20 -#define IRQ0 0x00 -#define IRQ1 0x01 -#define INT_VECTOR_SLAVE 0x28 -#define IRQ8 0x00 -#define IRQ9 0x01 - -#define MASTER_PIC_ICW3 0x21 -#define CASCADED_PIC (1 << 2) - -#define MASTER_PIC_ICW4 0x21 -#define SLAVE_PIC_ICW4 0xa1 -#define MICROPROCESSOR_MODE (1 << 0) - -#define SLAVE_PIC_ICW3 0xa1 -#define SLAVE_ID 0x02 - -#define MASTER_PIC_OCW1 0x21 -#define SLAVE_PIC_OCW1 0xa1 -#define IRQ2 (1 << 2) -#define ALL_IRQS 0xff - -#define ELCR1 0x4d0 -#define ELCR2 0x4d1 +/* Read the current PIC IRQ mask */ +u16 pic_read_irq_mask(void) +{ + u16 mask; + int i; + + mask = inb(MASTER_PIC_OCW1) | (inb(SLAVE_PIC_OCW1) << 8); + + printk(BIOS_DEBUG, "8259 PIC: OCW1 IRQ Mask: 0x%x\n", mask); + printk(BIOS_SPEW, "\tEnabled IRQs (0 = Unmasked, 1 = Masked off):\n" + "\t\tMaster\t\tSlave\n"); + for(i = 0; i <= 7; i++) { + printk(BIOS_SPEW, "\t\tIRQ%X: %x\t\tIRQ%X: %x\n", + i, (mask >> i) & 1, i + 8, (mask >> (i + 8)) & 1); + } + return mask; +} + +/* + * Write an IRQ mask to the PIC: + * IRQA is bit 0xA in the 16 bit bitmask (OCW1) + */ +void pic_write_irq_mask(u16 mask) +{ + outb(mask, MASTER_PIC_OCW1); + outb(mask >> 8, SLAVE_PIC_OCW1); +} + +/* + * The PIC IRQs default to masked off + * Allow specific IRQs to be enabled (1) + * or disabled by (0) the user + */ +void pic_irq_enable(u8 int_num, u8 mask) +{ + pic_write_irq_mask(pic_read_irq_mask() & ~(mask << int_num)); + pic_read_irq_mask(); +} void setup_i8259(void) { @@ -113,14 +118,12 @@ void i8259_configure_irq_trigger(int int_num, int is_level_triggered) { u16 int_bits = inb(ELCR1) | (((u16)inb(ELCR2)) << 8); - printk(BIOS_SPEW, "%s: current interrupts are 0x%x\n", __func__, int_bits); if (is_level_triggered) int_bits |= (1 << int_num); else int_bits &= ~(1 << int_num); /* Write new values */ - printk(BIOS_SPEW, "%s: try to set interrupts 0x%x\n", __func__, int_bits); outb((u8)(int_bits & 0xff), ELCR1); outb((u8)(int_bits >> 8), ELCR2); |