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Diffstat (limited to 'board/MAI/AmigaOneG3SE/i8259.c')
| -rw-r--r-- | board/MAI/AmigaOneG3SE/i8259.c | 230 |
1 files changed, 0 insertions, 230 deletions
diff --git a/board/MAI/AmigaOneG3SE/i8259.c b/board/MAI/AmigaOneG3SE/i8259.c deleted file mode 100644 index 34f489f..0000000 --- a/board/MAI/AmigaOneG3SE/i8259.c +++ /dev/null @@ -1,230 +0,0 @@ -/* - * (C) Copyright 2002 - * John W. Linville, linville@tuxdriver.com - * - * See file CREDITS for list of people who contributed to this - * project. - * - * 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. - * - * This program is distributed in the hope that it will be useful, - * but WITHOUT ANY WARRANTY; without even the implied warranty of - * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the - * GNU General Public License for more details. - * - * You should have received a copy of the GNU General Public License - * along with this program; if not, write to the Free Software - * Foundation, Inc., 59 Temple Place, Suite 330, Boston, - * MA 02111-1307 USA - */ - -#include <common.h> -#include "i8259.h" - -#undef IRQ_DEBUG - -#ifdef IRQ_DEBUG -#define PRINTF(fmt,args...) printf (fmt ,##args) -#else -#define PRINTF(fmt,args...) -#endif - -static inline unsigned char read_byte(volatile unsigned char* from) -{ - int x; - asm volatile ("lbz %0,%1\n eieio" : "=r" (x) : "m" (*from)); - return (unsigned char)x; -} - -static inline void write_byte(volatile unsigned char *to, int x) -{ - asm volatile ("stb %1,%0\n eieio" : "=m" (*to) : "r" (x)); -} - -static inline unsigned long read_long_little(volatile unsigned long *from) -{ - unsigned long x; - asm volatile ("lwbrx %0,0,%1\n eieio\n sync" : "=r" (x) : "r" (from), "m"(*from)); - return (unsigned long)x; -} - -#ifdef out8 -#undef out8 -#endif - -#ifdef in8 -#undef in8 -#endif - -#define out8(addr, byte) write_byte(0xFE000000 | addr, byte) -#define in8(addr) read_byte(0xFE000000 | addr) - -/* - * This contains the irq mask for both 8259A irq controllers, - */ -static char cached_imr[2] = {0xff, 0xff}; - -#define cached_imr1 (cached_imr[0]) -#define cached_imr2 (cached_imr[1]) - -void i8259_init(void) -{ - char dummy; - PRINTF("Initializing Interrupt controller\n"); - /* init master interrupt controller */ - out8(0x20, 0x11); /* 0x19); /###* Start init sequence */ - out8(0x21, 0x00); /* Vector base */ - out8(0x21, 0x04); /* edge tiggered, Cascade (slave) on IRQ2 */ - out8(0x21, 0x11); /* was: 0x01); /###* Select 8086 mode */ - - /* init slave interrupt controller */ - out8(0xA0, 0x11); /* 0x19); /###* Start init sequence */ - out8(0xA1, 0x08); /* Vector base */ - out8(0xA1, 0x02); /* edge triggered, Cascade (slave) on IRQ2 */ - out8(0xA1, 0x11); /* was: 0x01); /###* Select 8086 mode */ - - /* always read ISR */ - out8(0x20, 0x0B); - dummy = in8(ISR_1); - out8(0xA0, 0x0B); - dummy = in8(ISR_2); - -/* out8(0x43, 0x30); */ -/* out8(0x40, 0); */ -/* out8(0x40, 0); */ -/* out8(0x43, 0x70); */ -/* out8(0x41, 0); */ -/* out8(0x41, 0); */ -/* out8(0x43, 0xb0); */ -/* out8(0x42, 0); */ -/* out8(0x42, 0); */ - - /* Mask all interrupts */ - out8(IMR_2, cached_imr2); - out8(IMR_1, cached_imr1); - - i8259_unmask_irq(2); -#if 0 - { - int i; - for (i=0; i<16; i++) - { - i8259_unmask_irq(i); - } - } -#endif -} - -static volatile char *pci_intack = (void *)0xFEF00000; - -int i8259_irq(void) -{ - int irq; - - irq = read_long_little(pci_intack) & 0xff; - 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(~in8(0x20)&0x80) { - irq = -1; - } - } - - return irq; -} -int i8259_get_irq(struct pt_regs *regs) -{ - unsigned char irq; - - /* - * Perform an interrupt acknowledge cycle on controller 1 - */ - out8(OCW3_1, 0x0C); /* prepare for poll */ - irq = in8(IPL_1) & 7; - if (irq == 2) { - /* - * Interrupt is cascaded so perform interrupt - * acknowledge on controller 2 - */ - out8(OCW3_2, 0x0C); /* prepare for poll */ - irq = (in8(IPL_2) & 7) + 8; - if (irq == 15) { - /* - * This may be a spurious interrupt - * - * Read the interrupt status register. If the most - * significant bit is not set then there is no valid - * interrupt - */ - out8(OCW3_2, 0x0b); - if (~(in8(ISR_2) & 0x80)) { - return -1; - } - } - } else if (irq == 7) { - /* - * This may be a spurious interrupt - * - * Read the interrupt status register. If the most - * significant bit is not set then there is no valid - * interrupt - */ - out8(OCW3_1, 0x0b); - if (~(in8(ISR_1) & 0x80)) { - return -1; - } - } - return irq; -} - -/* - * Careful! The 8259A is a fragile beast, it pretty - * much _has_ to be done exactly like this (mask it - * first, _then_ send the EOI, and the order of EOI - * to the two 8259s is important! - */ -void i8259_mask_and_ack(int irq) -{ - if (irq > 7) { - cached_imr2 |= (1 << (irq - 8)); - in8(IMR_2); /* DUMMY */ - out8(IMR_2, cached_imr2); - out8(OCW2_2, 0x20); /* Non-specific EOI */ - out8(OCW2_1, 0x20); /* Non-specific EOI to cascade */ - } else { - cached_imr1 |= (1 << irq); - in8(IMR_1); /* DUMMY */ - out8(IMR_1, cached_imr1); - out8(OCW2_1, 0x20); /* Non-specific EOI */ - } -} - -void i8259_mask_irq(int irq) -{ - if (irq & 8) { - cached_imr2 |= (1 << (irq & 7)); - out8(IMR_2, cached_imr2); - } else { - cached_imr1 |= (1 << irq); - out8(IMR_1, cached_imr1); - } -} - -void i8259_unmask_irq(int irq) -{ - if (irq & 8) { - cached_imr2 &= ~(1 << (irq & 7)); - out8(IMR_2, cached_imr2); - } else { - cached_imr1 &= ~(1 << irq); - out8(IMR_1, cached_imr1); - } -} |