diff options
Diffstat (limited to 'c/src/lib/libbsp/powerpc/shared/irq/i8259.c')
-rw-r--r-- | c/src/lib/libbsp/powerpc/shared/irq/i8259.c | 149 |
1 files changed, 0 insertions, 149 deletions
diff --git a/c/src/lib/libbsp/powerpc/shared/irq/i8259.c b/c/src/lib/libbsp/powerpc/shared/irq/i8259.c deleted file mode 100644 index 7363e87ba0..0000000000 --- a/c/src/lib/libbsp/powerpc/shared/irq/i8259.c +++ /dev/null @@ -1,149 +0,0 @@ -/* - * This file contains the implementation of the function described in irq.h - * related to Intel 8259 Programmable Interrupt controller. - * - * Copyright (C) 1998, 1999 valette@crf.canon.fr - * - * The license and distribution terms for this file may be - * found in the file LICENSE in this distribution or at - * http://www.rtems.org/license/LICENSE. - */ - -#include <bsp.h> -#include <bsp/irq.h> - -/*-------------------------------------------------------------------------+ -| Cache for 1st and 2nd PIC IRQ line's status (enabled or disabled) register. -+--------------------------------------------------------------------------*/ -/* - * lower byte is interrupt mask on the master PIC. - * while upper bits are interrupt on the slave PIC. - */ -volatile rtems_i8259_masks i8259s_cache = 0xfffb; - -/*-------------------------------------------------------------------------+ -| Function: BSP_irq_disable_at_i8259s -| Description: Mask IRQ line in appropriate PIC chip. -| Global Variables: i8259s_cache -| Arguments: vector_offset - number of IRQ line to mask. -| Returns: original state or -1 on error. -+--------------------------------------------------------------------------*/ -int BSP_irq_disable_at_i8259s (const rtems_irq_number irqLine) -{ - unsigned short mask; - rtems_interrupt_level level; - int rval; - - if ( ((int)irqLine < BSP_ISA_IRQ_LOWEST_OFFSET) || - ((int)irqLine > BSP_ISA_IRQ_MAX_OFFSET) - ) - return -1; - - rtems_interrupt_disable(level); - - mask = 1 << irqLine; - rval = i8259s_cache & mask ? 0 : 1; - i8259s_cache |= mask; - - if (irqLine < 8) - { - outport_byte(PIC_MASTER_IMR_IO_PORT, i8259s_cache & 0xff); - } - else - { - outport_byte(PIC_SLAVE_IMR_IO_PORT, ((i8259s_cache & 0xff00) >> 8)); - } - rtems_interrupt_enable(level); - - return rval; -} - -/*-------------------------------------------------------------------------+ -| Function: BSP_irq_enable_at_i8259s -| Description: Unmask IRQ line in appropriate PIC chip. -| Global Variables: i8259s_cache -| Arguments: irqLine - number of IRQ line to mask. -| Returns: Nothing. -+--------------------------------------------------------------------------*/ -int BSP_irq_enable_at_i8259s (const rtems_irq_number irqLine) -{ - unsigned short mask; - rtems_interrupt_level level; - - if ( ((int)irqLine < BSP_ISA_IRQ_LOWEST_OFFSET) || - ((int)irqLine > BSP_ISA_IRQ_MAX_OFFSET ) - ) - return 1; - - rtems_interrupt_disable(level); - - mask = ~(1 << irqLine); - i8259s_cache &= mask; - - if (irqLine < 8) - { - outport_byte(PIC_MASTER_IMR_IO_PORT, i8259s_cache & 0xff); - } - else - { - outport_byte(PIC_SLAVE_IMR_IO_PORT, ((i8259s_cache & 0xff00) >> 8)); - } - rtems_interrupt_enable(level); - - return 0; -} /* mask_irq */ - -int BSP_irq_enabled_at_i8259s (const rtems_irq_number irqLine) -{ - unsigned short mask; - - if ( ((int)irqLine < BSP_ISA_IRQ_LOWEST_OFFSET) || - ((int)irqLine > BSP_ISA_IRQ_MAX_OFFSET) - ) - return 1; - - mask = (1 << irqLine); - return (~(i8259s_cache & mask)); -} - -/*-------------------------------------------------------------------------+ -| Function: BSP_irq_ack_at_i8259s -| Description: Signal generic End Of Interrupt (EOI) to appropriate PIC. -| Global Variables: None. -| Arguments: irqLine - number of IRQ line to acknowledge. -| Returns: Nothing. -+--------------------------------------------------------------------------*/ -int BSP_irq_ack_at_i8259s (const rtems_irq_number irqLine) -{ - if (irqLine >= 8) { - outport_byte(PIC_MASTER_COMMAND_IO_PORT, SLAVE_PIC_EOSI); - outport_byte(PIC_SLAVE_COMMAND_IO_PORT, (PIC_EOSI | (irqLine - 8))); - } - else { - outport_byte(PIC_MASTER_COMMAND_IO_PORT, (PIC_EOSI | irqLine)); - } - - return 0; - -} /* ackIRQ */ - -void BSP_i8259s_init(void) -{ - /* - * init master 8259 interrupt controller - */ - outport_byte(PIC_MASTER_COMMAND_IO_PORT, 0x11); /* Start init sequence */ - outport_byte(PIC_MASTER_IMR_IO_PORT, 0x00);/* Vector base = 0 */ - outport_byte(PIC_MASTER_IMR_IO_PORT, 0x04);/* edge tiggered, Cascade (slave) on IRQ2 */ - outport_byte(PIC_MASTER_IMR_IO_PORT, 0x01);/* Select 8086 mode */ - outport_byte(PIC_MASTER_IMR_IO_PORT, 0xFB); /* Mask all except cascade */ - /* - * init slave interrupt controller - */ - outport_byte(PIC_SLAVE_COMMAND_IO_PORT, 0x11); /* Start init sequence */ - outport_byte(PIC_SLAVE_IMR_IO_PORT, 0x08);/* Vector base = 8 */ - outport_byte(PIC_SLAVE_IMR_IO_PORT, 0x02);/* edge triggered, Cascade (slave) on IRQ2 */ - outport_byte(PIC_SLAVE_IMR_IO_PORT, 0x01); /* Select 8086 mode */ - outport_byte(PIC_SLAVE_IMR_IO_PORT, 0xFF); /* Mask all */ - -} |