1/* $NetBSD: gfpic.c,v 1.2 2024/04/24 14:41:13 thorpej Exp $ */ 2 3/*- 4 * Copyright (c) 2023 The NetBSD Foundation, Inc. 5 * All rights reserved. 6 * 7 * This code is derived from software contributed to The NetBSD Foundation 8 * by Jason R. Thorpe. 9 * 10 * Redistribution and use in source and binary forms, with or without 11 * modification, are permitted provided that the following conditions 12 * are met: 13 * 1. Redistributions of source code must retain the above copyright 14 * notice, this list of conditions and the following disclaimer. 15 * 2. Redistributions in binary form must reproduce the above copyright 16 * notice, this list of conditions and the following disclaimer in the 17 * documentation and/or other materials provided with the distribution. 18 * 19 * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS 20 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED 21 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 22 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS 23 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 24 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 25 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 26 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 27 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 28 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 29 * POSSIBILITY OF SUCH DAMAGE. 30 */ 31 32/* 33 * Support for the Goldfish virtual Programmable Interrupt Controller. 34 */ 35 36#include <sys/cdefs.h> 37__KERNEL_RCSID(0, "$NetBSD: gfpic.c,v 1.2 2024/04/24 14:41:13 thorpej Exp $"); 38 39#include <sys/types.h> 40#include <sys/systm.h> 41#include <sys/bus.h> 42 43#include <dev/goldfish/gfpicvar.h> 44 45/* 46 * Goldfish PIC registers. 47 */ 48#define GFPIC_STATUS (0 << 2) /* pending interrupt count */ 49#define GFPIC_PENDING (1 << 2) /* pending interrupt bitmask */ 50#define GFPIC_DISABLE_ALL (2 << 2) /* disables / clears all interrupts */ 51#define GFPIC_DISABLE (3 << 2) /* disable IRQs (bitmask) */ 52#define GFPIC_ENABLE (4 << 2) /* enable IRQs (bitmask) */ 53 54#define REG_READ(sc, r) \ 55 bus_space_read_4((sc)->sc_bst, (sc)->sc_bsh, (r)) 56#define REG_WRITE(sc, r, v) \ 57 bus_space_write_4((sc)->sc_bst, (sc)->sc_bsh, (r), (v)) 58 59/* 60 * gfpic_attach -- 61 * Attach a Goldfish virtual PIC. 62 */ 63void 64gfpic_attach(struct gfpic_softc *sc) 65{ 66 aprint_naive("\n"); 67 aprint_normal(": Google Goldfish PIC\n"); 68 69 REG_WRITE(sc, GFPIC_DISABLE_ALL, 0); 70} 71 72/* 73 * gfpic_enable -- 74 * Enable the specified IRQ on a Goldfish virtual PIC. 75 */ 76void 77gfpic_enable(struct gfpic_softc *sc, int pirq) 78{ 79 KASSERT(pirq >= 0); 80 KASSERT(pirq <= 31); 81 82 REG_WRITE(sc, GFPIC_ENABLE, (1U << pirq)); 83} 84 85/* 86 * gfpic_disable -- 87 * Disable the specified IRQ on a Goldfish virtual PIC. 88 */ 89void 90gfpic_disable(struct gfpic_softc *sc, int pirq) 91{ 92 KASSERT(pirq >= 0); 93 KASSERT(pirq <= 31); 94 95 REG_WRITE(sc, GFPIC_DISABLE, (1U << pirq)); 96} 97 98/* 99 * gfpic_pending -- 100 * Return the next pending IRQ on a Goldfish virtual PIC, 101 * or -1 if there are none. 102 */ 103int 104gfpic_pending(struct gfpic_softc *sc) 105{ 106 return ffs(REG_READ(sc, GFPIC_PENDING)) - 1; 107} 108