diff options
Diffstat (limited to 'src')
| -rw-r--r-- | src/drivers/pc80/i8259.c | 75 | ||||
| -rw-r--r-- | src/include/pc80/i8259.h | 66 |
2 files changed, 104 insertions, 37 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); diff --git a/src/include/pc80/i8259.h b/src/include/pc80/i8259.h index 7e99e4baa1..561fc5c863 100644 --- a/src/include/pc80/i8259.h +++ b/src/include/pc80/i8259.h @@ -2,6 +2,7 @@ * This file is part of the coreboot project. * * Copyright (C) 2007-2009 coresystems GmbH + * Copyright (C) 2014 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 @@ -20,10 +21,73 @@ #ifndef PC80_I8259_H #define PC80_I8259_H -void setup_i8259(void); +/* + * IRQ numbers and common usage + * If an IRQ does not say it is 'Reserved' + * then it can be used by a device, though + * some systems may not adhere to this map. + */ +/* PIC IRQs */ +#define IRQ_DIS 0x1F /* IRQ is disabled */ +#define IRQ_0 0x00 /* Reserved - Timer IRQ */ +#define IRQ_1 0x01 /* Keyboard controller */ +#define IRQ_2 0x02 /* Reserved - Cascade to Slave PIC */ +#define IRQ_3 0x03 /* Serial Port 2 & 4 */ +#define IRQ_4 0x04 /* Serial Port 1 & 3 */ +#define IRQ_5 0x05 /* Parallel Port 2 & 3 or Sound Card */ +#define IRQ_6 0x06 /* Floppy Disk Controller */ +#define IRQ_7 0x07 /* Parallel Port 1 */ +#define IRQ_8 0x08 /* Reserved - RTC */ +#define IRQ_9 0x09 /* Reserved - ACPI System Control Interrupt */ +#define IRQ_10 0x0A /* Free or SCSI or NIC */ +#define IRQ_11 0x0B /* Free or SCSI or NIC */ +#define IRQ_12 0x0C /* PS/2 Mouse */ +#define IRQ_13 0x0D /* Reserved - CPU Floating Point Unit */ +#define IRQ_14 0x0E /* Primary ATA */ +#define IRQ_15 0x0F /* Secondary ATA */ + +#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 #define IRQ_LEVEL_TRIGGERED 1 #define IRQ_EDGE_TRIGGERED 0 + +u16 pic_read_irq_mask(void); +void pic_write_irq_mask(u16 mask); +void pic_irq_enable(u8 int_num, u8 mask); +void setup_i8259(void); void i8259_configure_irq_trigger(int int_num, int is_level_triggered); #endif /* PC80_I8259_H */ |