/* $NetBSD: isa_machdep.c,v 1.8 2003/08/07 16:29:20 agc Exp $ */ /*- * Copyright (c) 1998 The NetBSD Foundation, Inc. * All rights reserved. * * This code is derived from software contributed to The NetBSD Foundation * by Charles M. Hannum. * * Redistribution and use in source and binary forms, with or without * modification, are permitted provided that the following conditions * are met: * 1. Redistributions of source code must retain the above copyright * notice, this list of conditions and the following disclaimer. * 2. Redistributions in binary form must reproduce the above copyright * notice, this list of conditions and the following disclaimer in the * documentation and/or other materials provided with the distribution. * 3. All advertising materials mentioning features or use of this software * must display the following acknowledgement: * This product includes software developed by the NetBSD * Foundation, Inc. and its contributors. * 4. Neither the name of The NetBSD Foundation nor the names of its * contributors may be used to endorse or promote products derived * from this software without specific prior written permission. * * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE * POSSIBILITY OF SUCH DAMAGE. */ /*- * Copyright (c) 1991 The Regents of the University of California. * All rights reserved. * * This code is derived from software contributed to Berkeley by * William Jolitz. * * Redistribution and use in source and binary forms, with or without * modification, are permitted provided that the following conditions * are met: * 1. Redistributions of source code must retain the above copyright * notice, this list of conditions and the following disclaimer. * 2. Redistributions in binary form must reproduce the above copyright * notice, this list of conditions and the following disclaimer in the * documentation and/or other materials provided with the distribution. * 3. Neither the name of the University nor the names of its contributors * may be used to endorse or promote products derived from this software * without specific prior written permission. * * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF * SUCH DAMAGE. * * @(#)isa.c 7.2 (Berkeley) 5/13/91 */ #include __KERNEL_RCSID(0, "$NetBSD: isa_machdep.c,v 1.8 2003/08/07 16:29:20 agc Exp $"); #include #include #include #include #include #include #include #include #define IO_ELCR1 0x4d0 #define IO_ELCR2 0x4d1 const struct evcnt * isa_intr_evcnt(isa_chipset_tag_t ic, int irq) { /* XXX for now, no evcnt parent reported */ return NULL; } /* * Set up an interrupt handler to start being called. * XXX PRONE TO RACE CONDITIONS, UGLY, 'INTERESTING' INSERTION ALGORITHM. */ void * isa_intr_establish(ic, irq, type, level, ih_fun, ih_arg) isa_chipset_tag_t ic; int irq; int type; int level; int (*ih_fun) __P((void *)); void *ih_arg; { return (void *)intr_establish(irq, type, level, ih_fun, ih_arg); } /* * Deregister an interrupt handler. */ void isa_intr_disestablish(ic, arg) isa_chipset_tag_t ic; void *arg; { intr_disestablish(arg); } void isa_attach_hook(parent, self, iba) struct device *parent, *self; struct isabus_attach_args *iba; { /* Nothing to do. */ } int isa_intr(void) { int irq; isa_outb(IO_ICU1, 0x0c); irq = isa_inb(IO_ICU1) & 0x07; if (irq == IRQ_SLAVE) { isa_outb(IO_ICU2, 0x0c); irq = (isa_inb(IO_ICU2) & 0x07) + 8; } return (irq); } void isa_intr_mask(mask) int mask; { isa_outb(IO_ICU1+1, mask); isa_outb(IO_ICU2+1, mask >> 8); } void isa_intr_clr(irq) int irq; { if (irq < 8) { isa_outb(IO_ICU1, 0xe0 | irq); } else { isa_outb(IO_ICU2, 0xe0 | (irq & 7)); isa_outb(IO_ICU1, 0xe0 | IRQ_SLAVE); } } /* * Initialize the Interrupt controller logic. */ void init_icu(int lvlmask) { int i; extern int intrtype[]; for (i= 0; i < ICU_LEN; i++) { switch (i) { case 0: case 2: case 8: intrtype[i] = IST_EDGE; break; default: intrtype[i] = (1 << i) & lvlmask ? IST_LEVEL : IST_NONE; } } #ifdef DEBUG printf("old elcr = 0x%02x%02x, new = 0x%04x\n", isa_inb(IO_ELCR2), isa_inb(IO_ELCR1), lvlmask); #endif isa_outb(IO_ELCR1, (lvlmask >> 0) & 0xff); isa_outb(IO_ELCR2, (lvlmask >> 8) & 0xff); isa_outb(IO_ICU1, 0x11); /* program device, four bytes */ isa_outb(IO_ICU1+1, 0); /* starting at this vector */ isa_outb(IO_ICU1+1, 1 << IRQ_SLAVE); /* slave on line 2 */ isa_outb(IO_ICU1+1, 1); /* 8086 mode */ isa_outb(IO_ICU1+1, 0xff); /* leave interrupts masked */ isa_outb(IO_ICU2, 0x11); /* program device, four bytes */ isa_outb(IO_ICU2+1, 8); /* starting at this vector */ isa_outb(IO_ICU2+1, IRQ_SLAVE); isa_outb(IO_ICU2+1, 1); /* 8086 mode */ isa_outb(IO_ICU2+1, 0xff); /* leave interrupts masked */ } void isa_setirqstat(irq, enabled, type) int irq, enabled, type; { u_int8_t elcr[2]; int icu, bit; icu = irq / 8; bit = irq % 8; elcr[0] = isa_inb(IO_ELCR1); elcr[1] = isa_inb(IO_ELCR2); if (type == IST_LEVEL) elcr[icu] |= 1 << bit; else elcr[icu] &= ~(1 << bit); isa_outb(IO_ELCR1, elcr[0]); isa_outb(IO_ELCR2, elcr[1]); } int isa_intr_alloc(isa_chipset_tag_t c, int mask, int type, int *irq_p) { int irq; int maybe_irq = -1; int shared_depth = 0; mask &= 0x8b28; /* choose from 3, 5, 8, 9, 11, 15 XXX */ for (irq = 0; mask != 0; mask >>= 1, irq++) { if ((mask & 1) == 0) continue; if (intrtype[irq] == IST_NONE) { *irq_p = irq; return 0; } /* Level interrupts can be shared */ if (type == IST_LEVEL && intrtype[irq] == IST_LEVEL) { struct intrhand *ih = intrhand[irq]; int depth; if (maybe_irq == -1) { maybe_irq = irq; continue; } for (depth = 0; ih != NULL; ih = ih->ih_next) depth++; if (depth < shared_depth) { maybe_irq = irq; shared_depth = depth; } } } if (maybe_irq != -1) { *irq_p = maybe_irq; return 0; } return 1; }