bcm2835_intr.c revision 1.1.2.2
1 1.1.2.2 jdc /* $NetBSD: bcm2835_intr.c,v 1.1.2.2 2012/08/09 06:36:49 jdc Exp $ */ 2 1.1.2.2 jdc 3 1.1.2.2 jdc /*- 4 1.1.2.2 jdc * Copyright (c) 2012 The NetBSD Foundation, Inc. 5 1.1.2.2 jdc * All rights reserved. 6 1.1.2.2 jdc * 7 1.1.2.2 jdc * This code is derived from software contributed to The NetBSD Foundation 8 1.1.2.2 jdc * by Nick Hudson 9 1.1.2.2 jdc * 10 1.1.2.2 jdc * Redistribution and use in source and binary forms, with or without 11 1.1.2.2 jdc * modification, are permitted provided that the following conditions 12 1.1.2.2 jdc * are met: 13 1.1.2.2 jdc * 1. Redistributions of source code must retain the above copyright 14 1.1.2.2 jdc * notice, this list of conditions and the following disclaimer. 15 1.1.2.2 jdc * 2. Redistributions in binary form must reproduce the above copyright 16 1.1.2.2 jdc * notice, this list of conditions and the following disclaimer in the 17 1.1.2.2 jdc * documentation and/or other materials provided with the distribution. 18 1.1.2.2 jdc * 19 1.1.2.2 jdc * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS 20 1.1.2.2 jdc * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED 21 1.1.2.2 jdc * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 22 1.1.2.2 jdc * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS 23 1.1.2.2 jdc * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 24 1.1.2.2 jdc * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 25 1.1.2.2 jdc * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 26 1.1.2.2 jdc * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 27 1.1.2.2 jdc * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 28 1.1.2.2 jdc * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 29 1.1.2.2 jdc * POSSIBILITY OF SUCH DAMAGE. 30 1.1.2.2 jdc */ 31 1.1.2.2 jdc 32 1.1.2.2 jdc #include <sys/cdefs.h> 33 1.1.2.2 jdc __KERNEL_RCSID(0, "$NetBSD: bcm2835_intr.c,v 1.1.2.2 2012/08/09 06:36:49 jdc Exp $"); 34 1.1.2.2 jdc 35 1.1.2.2 jdc #define _INTR_PRIVATE 36 1.1.2.2 jdc 37 1.1.2.2 jdc #include <sys/param.h> 38 1.1.2.2 jdc #include <sys/proc.h> 39 1.1.2.2 jdc #include <sys/device.h> 40 1.1.2.2 jdc 41 1.1.2.2 jdc #include <machine/intr.h> 42 1.1.2.2 jdc #include <sys/bus.h> 43 1.1.2.2 jdc 44 1.1.2.2 jdc #include <arm/pic/picvar.h> 45 1.1.2.2 jdc 46 1.1.2.2 jdc #include <arm/broadcom/bcm_amba.h> 47 1.1.2.2 jdc #include <arm/broadcom/bcm2835reg.h> 48 1.1.2.2 jdc 49 1.1.2.2 jdc static void bcm2835_pic_unblock_irqs(struct pic_softc *, size_t, uint32_t); 50 1.1.2.2 jdc static void bcm2835_pic_block_irqs(struct pic_softc *, size_t, uint32_t); 51 1.1.2.2 jdc static int bcm2835_pic_find_pending_irqs(struct pic_softc *); 52 1.1.2.2 jdc static void bcm2835_pic_establish_irq(struct pic_softc *, struct intrsource *); 53 1.1.2.2 jdc static void bcm2835_pic_source_name(struct pic_softc *, int, char *, 54 1.1.2.2 jdc size_t); 55 1.1.2.2 jdc 56 1.1.2.2 jdc static int bcm2835_icu_match(device_t, cfdata_t, void *); 57 1.1.2.2 jdc static void bcm2835_icu_attach(device_t, device_t, void *); 58 1.1.2.2 jdc 59 1.1.2.2 jdc static struct pic_ops bcm2835_picops = { 60 1.1.2.2 jdc .pic_unblock_irqs = bcm2835_pic_unblock_irqs, 61 1.1.2.2 jdc .pic_block_irqs = bcm2835_pic_block_irqs, 62 1.1.2.2 jdc .pic_find_pending_irqs = bcm2835_pic_find_pending_irqs, 63 1.1.2.2 jdc .pic_establish_irq = bcm2835_pic_establish_irq, 64 1.1.2.2 jdc .pic_source_name = bcm2835_pic_source_name, 65 1.1.2.2 jdc }; 66 1.1.2.2 jdc 67 1.1.2.2 jdc struct pic_softc bcm2835_pic = { 68 1.1.2.2 jdc .pic_ops = &bcm2835_picops, 69 1.1.2.2 jdc .pic_maxsources = BCM2835_NIRQ, 70 1.1.2.2 jdc .pic_name = "bcm2835 pic", 71 1.1.2.2 jdc }; 72 1.1.2.2 jdc 73 1.1.2.2 jdc struct bcm2835icu_softc { 74 1.1.2.2 jdc device_t sc_dev; 75 1.1.2.2 jdc bus_space_tag_t sc_iot; 76 1.1.2.2 jdc bus_space_handle_t sc_ioh; 77 1.1.2.2 jdc struct pic_softc *sc_pic; 78 1.1.2.2 jdc }; 79 1.1.2.2 jdc 80 1.1.2.2 jdc struct bcm2835icu_softc *bcmicu_sc; 81 1.1.2.2 jdc 82 1.1.2.2 jdc #define read_bcm2835reg(o) \ 83 1.1.2.2 jdc bus_space_read_4(bcmicu_sc->sc_iot, bcmicu_sc->sc_ioh, (o)) 84 1.1.2.2 jdc 85 1.1.2.2 jdc #define write_bcm2835reg(o, v) \ 86 1.1.2.2 jdc bus_space_write_4(bcmicu_sc->sc_iot, bcmicu_sc->sc_ioh, (o), (v)) 87 1.1.2.2 jdc 88 1.1.2.2 jdc 89 1.1.2.2 jdc #define bcm2835_barrier() \ 90 1.1.2.2 jdc bus_space_barrier(bcmicu_sc->sc_iot, bcmicu_sc->sc_ioh, 0, \ 91 1.1.2.2 jdc BCM2835_ARMICU_SIZE, BUS_SPACE_BARRIER_READ|BUS_SPACE_BARRIER_WRITE) 92 1.1.2.2 jdc 93 1.1.2.2 jdc static const char * const bcm2835_sources[BCM2835_NIRQ] = { 94 1.1.2.2 jdc "(unused 0)", "(unused 1)", "(unused 2)", "timer3", 95 1.1.2.2 jdc "(unused 4)", "(unused 5)", "(unused 6)", "jpeg", 96 1.1.2.2 jdc "(unused 8)", "usb", "(unused 10)", "(unused 11)" 97 1.1.2.2 jdc "(unused 12)", "(unused 13)", "(unused 14)", "(unused 15)" 98 1.1.2.2 jdc "(unused 16)", "(unused 17)", "dma2", "dma3", 99 1.1.2.2 jdc "(unused 20)", "(unused 21)", "(unused 22)", "(unused 23)", 100 1.1.2.2 jdc "(unused 24)", "(unused 25)", "(unused 26)", "(unused 27)", 101 1.1.2.2 jdc "(unused 28)", "aux", "(unused 30)", "(unused 31)", 102 1.1.2.2 jdc "(unused 32)", "(unused 33)", "(unused 34)", "(unused 35)", 103 1.1.2.2 jdc "(unused 36)", "(unused 37)", "(unused 38)", "(unused 39)", 104 1.1.2.2 jdc "(unused 40)", "(unused 41)", "(unused 42)", "i2c spl slv", 105 1.1.2.2 jdc "(unused 44)", "pwa0", "pwa1", "(unused 47)", 106 1.1.2.2 jdc "smi", "gpio[0]", "gpio[1]", "gpio[2]", 107 1.1.2.2 jdc "gpio[3]", "i2c", "spi", "pcm", 108 1.1.2.2 jdc "sdio", "uart", "(unused 58)", "(unused 59)", 109 1.1.2.2 jdc "(unused 60)", "(unused 61)", "emmc", "(unused 63)", 110 1.1.2.2 jdc "Timer", "Mailbox", "Doorbell0", "Doorbell1", 111 1.1.2.2 jdc "GPU0 Halted", "GPU1 Halted", "Illegal #1", "Illegal #0" 112 1.1.2.2 jdc }; 113 1.1.2.2 jdc 114 1.1.2.2 jdc #define BCM2835_INTBIT_PENDING1 __BIT(8) 115 1.1.2.2 jdc #define BCM2835_INTBIT_PENDING2 __BIT(9) 116 1.1.2.2 jdc #define BCM2835_INTBIT_ARM __BITS(0,7) 117 1.1.2.2 jdc #define BCM2835_INTBIT_GPU0 __BITS(10,14) 118 1.1.2.2 jdc #define BCM2835_INTBIT_GPU1 __BITS(15,20) 119 1.1.2.2 jdc 120 1.1.2.2 jdc CFATTACH_DECL_NEW(bcmicu, sizeof(struct bcm2835icu_softc), 121 1.1.2.2 jdc bcm2835_icu_match, bcm2835_icu_attach, NULL, NULL); 122 1.1.2.2 jdc 123 1.1.2.2 jdc static int 124 1.1.2.2 jdc bcm2835_icu_match(device_t parent, cfdata_t cf, void *aux) 125 1.1.2.2 jdc { 126 1.1.2.2 jdc struct amba_attach_args *aaa = aux; 127 1.1.2.2 jdc 128 1.1.2.2 jdc if (strcmp(aaa->aaa_name, "icu") != 0) 129 1.1.2.2 jdc return 0; 130 1.1.2.2 jdc 131 1.1.2.2 jdc return 1; 132 1.1.2.2 jdc } 133 1.1.2.2 jdc 134 1.1.2.2 jdc static void 135 1.1.2.2 jdc bcm2835_icu_attach(device_t parent, device_t self, void *aux) 136 1.1.2.2 jdc { 137 1.1.2.2 jdc struct bcm2835icu_softc *sc = device_private(self); 138 1.1.2.2 jdc struct amba_attach_args *aaa = aux; 139 1.1.2.2 jdc 140 1.1.2.2 jdc sc->sc_dev = self; 141 1.1.2.2 jdc sc->sc_iot = aaa->aaa_iot; 142 1.1.2.2 jdc sc->sc_pic = &bcm2835_pic; 143 1.1.2.2 jdc 144 1.1.2.2 jdc if (bus_space_map(aaa->aaa_iot, aaa->aaa_addr, aaa->aaa_size, 0, 145 1.1.2.2 jdc &sc->sc_ioh)) { 146 1.1.2.2 jdc aprint_error_dev(self, "unable to map device\n"); 147 1.1.2.2 jdc return; 148 1.1.2.2 jdc } 149 1.1.2.2 jdc 150 1.1.2.2 jdc bcmicu_sc = sc; 151 1.1.2.2 jdc pic_add(sc->sc_pic, 0); 152 1.1.2.2 jdc aprint_normal("\n"); 153 1.1.2.2 jdc } 154 1.1.2.2 jdc 155 1.1.2.2 jdc void 156 1.1.2.2 jdc bcm2835_irq_handler(void *frame) 157 1.1.2.2 jdc { 158 1.1.2.2 jdc struct cpu_info * const ci = curcpu(); 159 1.1.2.2 jdc const int oldipl = ci->ci_cpl; 160 1.1.2.2 jdc const uint32_t oldipl_mask = __BIT(oldipl); 161 1.1.2.2 jdc int ipl_mask = 0; 162 1.1.2.2 jdc 163 1.1.2.2 jdc ci->ci_data.cpu_nintr++; 164 1.1.2.2 jdc 165 1.1.2.2 jdc bcm2835_barrier(); 166 1.1.2.2 jdc ipl_mask = bcm2835_pic_find_pending_irqs(&bcm2835_pic); 167 1.1.2.2 jdc 168 1.1.2.2 jdc /* 169 1.1.2.2 jdc * Record the pending_ipls and deliver them if we can. 170 1.1.2.2 jdc */ 171 1.1.2.2 jdc if ((ipl_mask & ~oldipl_mask) > oldipl_mask) 172 1.1.2.2 jdc pic_do_pending_ints(I32_bit, oldipl, frame); 173 1.1.2.2 jdc } 174 1.1.2.2 jdc 175 1.1.2.2 jdc 176 1.1.2.2 jdc static void 177 1.1.2.2 jdc bcm2835_pic_unblock_irqs(struct pic_softc *pic, size_t irqbase, 178 1.1.2.2 jdc uint32_t irq_mask) 179 1.1.2.2 jdc { 180 1.1.2.2 jdc 181 1.1.2.2 jdc write_bcm2835reg(BCM2835_INTC_ENABLEBASE + (irqbase >> 3), irq_mask); 182 1.1.2.2 jdc bcm2835_barrier(); 183 1.1.2.2 jdc } 184 1.1.2.2 jdc 185 1.1.2.2 jdc static void 186 1.1.2.2 jdc bcm2835_pic_block_irqs(struct pic_softc *pic, size_t irqbase, 187 1.1.2.2 jdc uint32_t irq_mask) 188 1.1.2.2 jdc { 189 1.1.2.2 jdc 190 1.1.2.2 jdc write_bcm2835reg(BCM2835_INTC_DISABLEBASE + (irqbase >> 3), irq_mask); 191 1.1.2.2 jdc bcm2835_barrier(); 192 1.1.2.2 jdc } 193 1.1.2.2 jdc 194 1.1.2.2 jdc /* 195 1.1.2.2 jdc * Called with interrupts disabled 196 1.1.2.2 jdc */ 197 1.1.2.2 jdc static int 198 1.1.2.2 jdc bcm2835_pic_find_pending_irqs(struct pic_softc *pic) 199 1.1.2.2 jdc { 200 1.1.2.2 jdc int ipl = 0; 201 1.1.2.2 jdc uint32_t bpending, gpu0irq, gpu1irq, armirq; 202 1.1.2.2 jdc 203 1.1.2.2 jdc bcm2835_barrier(); 204 1.1.2.2 jdc bpending = read_bcm2835reg(BCM2835_INTC_IRQBPENDING); 205 1.1.2.2 jdc if (bpending == 0) 206 1.1.2.2 jdc return 0; 207 1.1.2.2 jdc 208 1.1.2.2 jdc armirq = bpending & BCM2835_INTBIT_ARM; 209 1.1.2.2 jdc gpu0irq = bpending & BCM2835_INTBIT_GPU0; 210 1.1.2.2 jdc gpu1irq = bpending & BCM2835_INTBIT_GPU1; 211 1.1.2.2 jdc 212 1.1.2.2 jdc if (armirq) { 213 1.1.2.2 jdc ipl |= pic_mark_pending_sources(pic, BCM2835_INT_BASICBASE, 214 1.1.2.2 jdc armirq); 215 1.1.2.2 jdc 216 1.1.2.2 jdc } 217 1.1.2.2 jdc 218 1.1.2.2 jdc if (gpu0irq || (bpending & BCM2835_INTBIT_PENDING1)) { 219 1.1.2.2 jdc uint32_t pending1; 220 1.1.2.2 jdc 221 1.1.2.2 jdc pending1 = read_bcm2835reg(BCM2835_INTC_IRQ1PENDING); 222 1.1.2.2 jdc ipl |= pic_mark_pending_sources(pic, BCM2835_INT_GPU0BASE, 223 1.1.2.2 jdc pending1); 224 1.1.2.2 jdc } 225 1.1.2.2 jdc if (gpu1irq || (bpending & BCM2835_INTBIT_PENDING2)) { 226 1.1.2.2 jdc uint32_t pending2; 227 1.1.2.2 jdc 228 1.1.2.2 jdc pending2 = read_bcm2835reg(BCM2835_INTC_IRQ2PENDING); 229 1.1.2.2 jdc ipl |= pic_mark_pending_sources(pic, BCM2835_INT_GPU1BASE, 230 1.1.2.2 jdc pending2); 231 1.1.2.2 jdc } 232 1.1.2.2 jdc 233 1.1.2.2 jdc return ipl; 234 1.1.2.2 jdc } 235 1.1.2.2 jdc 236 1.1.2.2 jdc static void 237 1.1.2.2 jdc bcm2835_pic_establish_irq(struct pic_softc *pic, struct intrsource *is) 238 1.1.2.2 jdc { 239 1.1.2.2 jdc 240 1.1.2.2 jdc /* Nothing really*/ 241 1.1.2.2 jdc KASSERT(is->is_irq < BCM2835_NIRQ); 242 1.1.2.2 jdc KASSERT(is->is_type == IST_LEVEL); 243 1.1.2.2 jdc } 244 1.1.2.2 jdc 245 1.1.2.2 jdc static void 246 1.1.2.2 jdc bcm2835_pic_source_name(struct pic_softc *pic, int irq, char *buf, size_t len) 247 1.1.2.2 jdc { 248 1.1.2.2 jdc 249 1.1.2.2 jdc strlcpy(buf, bcm2835_sources[irq], len); 250 1.1.2.2 jdc } 251
Indexes created Mon Oct 13 05:10:05 GMT 2025