bcm2835_intr.c revision 1.2.4.2
1 1.2.4.2 yamt /* $NetBSD: bcm2835_intr.c,v 1.2.4.2 2012/10/30 17:18:58 yamt Exp $ */ 2 1.2.4.2 yamt 3 1.2.4.2 yamt /*- 4 1.2.4.2 yamt * Copyright (c) 2012 The NetBSD Foundation, Inc. 5 1.2.4.2 yamt * All rights reserved. 6 1.2.4.2 yamt * 7 1.2.4.2 yamt * This code is derived from software contributed to The NetBSD Foundation 8 1.2.4.2 yamt * by Nick Hudson 9 1.2.4.2 yamt * 10 1.2.4.2 yamt * Redistribution and use in source and binary forms, with or without 11 1.2.4.2 yamt * modification, are permitted provided that the following conditions 12 1.2.4.2 yamt * are met: 13 1.2.4.2 yamt * 1. Redistributions of source code must retain the above copyright 14 1.2.4.2 yamt * notice, this list of conditions and the following disclaimer. 15 1.2.4.2 yamt * 2. Redistributions in binary form must reproduce the above copyright 16 1.2.4.2 yamt * notice, this list of conditions and the following disclaimer in the 17 1.2.4.2 yamt * documentation and/or other materials provided with the distribution. 18 1.2.4.2 yamt * 19 1.2.4.2 yamt * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS 20 1.2.4.2 yamt * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED 21 1.2.4.2 yamt * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 22 1.2.4.2 yamt * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS 23 1.2.4.2 yamt * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 24 1.2.4.2 yamt * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 25 1.2.4.2 yamt * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 26 1.2.4.2 yamt * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 27 1.2.4.2 yamt * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 28 1.2.4.2 yamt * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 29 1.2.4.2 yamt * POSSIBILITY OF SUCH DAMAGE. 30 1.2.4.2 yamt */ 31 1.2.4.2 yamt 32 1.2.4.2 yamt #include <sys/cdefs.h> 33 1.2.4.2 yamt __KERNEL_RCSID(0, "$NetBSD: bcm2835_intr.c,v 1.2.4.2 2012/10/30 17:18:58 yamt Exp $"); 34 1.2.4.2 yamt 35 1.2.4.2 yamt #define _INTR_PRIVATE 36 1.2.4.2 yamt 37 1.2.4.2 yamt #include <sys/param.h> 38 1.2.4.2 yamt #include <sys/proc.h> 39 1.2.4.2 yamt #include <sys/device.h> 40 1.2.4.2 yamt 41 1.2.4.2 yamt #include <machine/intr.h> 42 1.2.4.2 yamt #include <sys/bus.h> 43 1.2.4.2 yamt 44 1.2.4.2 yamt #include <arm/pic/picvar.h> 45 1.2.4.2 yamt 46 1.2.4.2 yamt #include <arm/broadcom/bcm_amba.h> 47 1.2.4.2 yamt #include <arm/broadcom/bcm2835reg.h> 48 1.2.4.2 yamt 49 1.2.4.2 yamt static void bcm2835_pic_unblock_irqs(struct pic_softc *, size_t, uint32_t); 50 1.2.4.2 yamt static void bcm2835_pic_block_irqs(struct pic_softc *, size_t, uint32_t); 51 1.2.4.2 yamt static int bcm2835_pic_find_pending_irqs(struct pic_softc *); 52 1.2.4.2 yamt static void bcm2835_pic_establish_irq(struct pic_softc *, struct intrsource *); 53 1.2.4.2 yamt static void bcm2835_pic_source_name(struct pic_softc *, int, char *, 54 1.2.4.2 yamt size_t); 55 1.2.4.2 yamt 56 1.2.4.2 yamt static int bcm2835_icu_match(device_t, cfdata_t, void *); 57 1.2.4.2 yamt static void bcm2835_icu_attach(device_t, device_t, void *); 58 1.2.4.2 yamt 59 1.2.4.2 yamt static struct pic_ops bcm2835_picops = { 60 1.2.4.2 yamt .pic_unblock_irqs = bcm2835_pic_unblock_irqs, 61 1.2.4.2 yamt .pic_block_irqs = bcm2835_pic_block_irqs, 62 1.2.4.2 yamt .pic_find_pending_irqs = bcm2835_pic_find_pending_irqs, 63 1.2.4.2 yamt .pic_establish_irq = bcm2835_pic_establish_irq, 64 1.2.4.2 yamt .pic_source_name = bcm2835_pic_source_name, 65 1.2.4.2 yamt }; 66 1.2.4.2 yamt 67 1.2.4.2 yamt struct pic_softc bcm2835_pic = { 68 1.2.4.2 yamt .pic_ops = &bcm2835_picops, 69 1.2.4.2 yamt .pic_maxsources = BCM2835_NIRQ, 70 1.2.4.2 yamt .pic_name = "bcm2835 pic", 71 1.2.4.2 yamt }; 72 1.2.4.2 yamt 73 1.2.4.2 yamt struct bcm2835icu_softc { 74 1.2.4.2 yamt device_t sc_dev; 75 1.2.4.2 yamt bus_space_tag_t sc_iot; 76 1.2.4.2 yamt bus_space_handle_t sc_ioh; 77 1.2.4.2 yamt struct pic_softc *sc_pic; 78 1.2.4.2 yamt }; 79 1.2.4.2 yamt 80 1.2.4.2 yamt struct bcm2835icu_softc *bcmicu_sc; 81 1.2.4.2 yamt 82 1.2.4.2 yamt #define read_bcm2835reg(o) \ 83 1.2.4.2 yamt bus_space_read_4(bcmicu_sc->sc_iot, bcmicu_sc->sc_ioh, (o)) 84 1.2.4.2 yamt 85 1.2.4.2 yamt #define write_bcm2835reg(o, v) \ 86 1.2.4.2 yamt bus_space_write_4(bcmicu_sc->sc_iot, bcmicu_sc->sc_ioh, (o), (v)) 87 1.2.4.2 yamt 88 1.2.4.2 yamt 89 1.2.4.2 yamt #define bcm2835_barrier() \ 90 1.2.4.2 yamt bus_space_barrier(bcmicu_sc->sc_iot, bcmicu_sc->sc_ioh, 0, \ 91 1.2.4.2 yamt BCM2835_ARMICU_SIZE, BUS_SPACE_BARRIER_READ|BUS_SPACE_BARRIER_WRITE) 92 1.2.4.2 yamt 93 1.2.4.2 yamt static const char * const bcm2835_sources[BCM2835_NIRQ] = { 94 1.2.4.2 yamt "(unused 0)", "(unused 1)", "(unused 2)", "timer3", 95 1.2.4.2 yamt "(unused 4)", "(unused 5)", "(unused 6)", "jpeg", 96 1.2.4.2 yamt "(unused 8)", "usb", "(unused 10)", "(unused 11)", 97 1.2.4.2 yamt "(unused 12)", "(unused 13)", "(unused 14)", "(unused 15)", 98 1.2.4.2 yamt "(unused 16)", "(unused 17)", "dma2", "dma3", 99 1.2.4.2 yamt "(unused 20)", "(unused 21)", "(unused 22)", "(unused 23)", 100 1.2.4.2 yamt "(unused 24)", "(unused 25)", "(unused 26)", "(unused 27)", 101 1.2.4.2 yamt "(unused 28)", "aux", "(unused 30)", "(unused 31)", 102 1.2.4.2 yamt "(unused 32)", "(unused 33)", "(unused 34)", "(unused 35)", 103 1.2.4.2 yamt "(unused 36)", "(unused 37)", "(unused 38)", "(unused 39)", 104 1.2.4.2 yamt "(unused 40)", "(unused 41)", "(unused 42)", "i2c spl slv", 105 1.2.4.2 yamt "(unused 44)", "pwa0", "pwa1", "(unused 47)", 106 1.2.4.2 yamt "smi", "gpio[0]", "gpio[1]", "gpio[2]", 107 1.2.4.2 yamt "gpio[3]", "i2c", "spi", "pcm", 108 1.2.4.2 yamt "sdio", "uart", "(unused 58)", "(unused 59)", 109 1.2.4.2 yamt "(unused 60)", "(unused 61)", "emmc", "(unused 63)", 110 1.2.4.2 yamt "Timer", "Mailbox", "Doorbell0", "Doorbell1", 111 1.2.4.2 yamt "GPU0 Halted", "GPU1 Halted", "Illegal #1", "Illegal #0" 112 1.2.4.2 yamt }; 113 1.2.4.2 yamt 114 1.2.4.2 yamt #define BCM2835_INTBIT_PENDING1 __BIT(8) 115 1.2.4.2 yamt #define BCM2835_INTBIT_PENDING2 __BIT(9) 116 1.2.4.2 yamt #define BCM2835_INTBIT_ARM __BITS(0,7) 117 1.2.4.2 yamt #define BCM2835_INTBIT_GPU0 __BITS(10,14) 118 1.2.4.2 yamt #define BCM2835_INTBIT_GPU1 __BITS(15,20) 119 1.2.4.2 yamt 120 1.2.4.2 yamt CFATTACH_DECL_NEW(bcmicu, sizeof(struct bcm2835icu_softc), 121 1.2.4.2 yamt bcm2835_icu_match, bcm2835_icu_attach, NULL, NULL); 122 1.2.4.2 yamt 123 1.2.4.2 yamt static int 124 1.2.4.2 yamt bcm2835_icu_match(device_t parent, cfdata_t cf, void *aux) 125 1.2.4.2 yamt { 126 1.2.4.2 yamt struct amba_attach_args *aaa = aux; 127 1.2.4.2 yamt 128 1.2.4.2 yamt if (strcmp(aaa->aaa_name, "icu") != 0) 129 1.2.4.2 yamt return 0; 130 1.2.4.2 yamt 131 1.2.4.2 yamt return 1; 132 1.2.4.2 yamt } 133 1.2.4.2 yamt 134 1.2.4.2 yamt static void 135 1.2.4.2 yamt bcm2835_icu_attach(device_t parent, device_t self, void *aux) 136 1.2.4.2 yamt { 137 1.2.4.2 yamt struct bcm2835icu_softc *sc = device_private(self); 138 1.2.4.2 yamt struct amba_attach_args *aaa = aux; 139 1.2.4.2 yamt 140 1.2.4.2 yamt sc->sc_dev = self; 141 1.2.4.2 yamt sc->sc_iot = aaa->aaa_iot; 142 1.2.4.2 yamt sc->sc_pic = &bcm2835_pic; 143 1.2.4.2 yamt 144 1.2.4.2 yamt if (bus_space_map(aaa->aaa_iot, aaa->aaa_addr, aaa->aaa_size, 0, 145 1.2.4.2 yamt &sc->sc_ioh)) { 146 1.2.4.2 yamt aprint_error_dev(self, "unable to map device\n"); 147 1.2.4.2 yamt return; 148 1.2.4.2 yamt } 149 1.2.4.2 yamt 150 1.2.4.2 yamt bcmicu_sc = sc; 151 1.2.4.2 yamt pic_add(sc->sc_pic, 0); 152 1.2.4.2 yamt aprint_normal("\n"); 153 1.2.4.2 yamt } 154 1.2.4.2 yamt 155 1.2.4.2 yamt void 156 1.2.4.2 yamt bcm2835_irq_handler(void *frame) 157 1.2.4.2 yamt { 158 1.2.4.2 yamt struct cpu_info * const ci = curcpu(); 159 1.2.4.2 yamt const int oldipl = ci->ci_cpl; 160 1.2.4.2 yamt const uint32_t oldipl_mask = __BIT(oldipl); 161 1.2.4.2 yamt int ipl_mask = 0; 162 1.2.4.2 yamt 163 1.2.4.2 yamt ci->ci_data.cpu_nintr++; 164 1.2.4.2 yamt 165 1.2.4.2 yamt bcm2835_barrier(); 166 1.2.4.2 yamt ipl_mask = bcm2835_pic_find_pending_irqs(&bcm2835_pic); 167 1.2.4.2 yamt 168 1.2.4.2 yamt /* 169 1.2.4.2 yamt * Record the pending_ipls and deliver them if we can. 170 1.2.4.2 yamt */ 171 1.2.4.2 yamt if ((ipl_mask & ~oldipl_mask) > oldipl_mask) 172 1.2.4.2 yamt pic_do_pending_ints(I32_bit, oldipl, frame); 173 1.2.4.2 yamt } 174 1.2.4.2 yamt 175 1.2.4.2 yamt 176 1.2.4.2 yamt static void 177 1.2.4.2 yamt bcm2835_pic_unblock_irqs(struct pic_softc *pic, size_t irqbase, 178 1.2.4.2 yamt uint32_t irq_mask) 179 1.2.4.2 yamt { 180 1.2.4.2 yamt 181 1.2.4.2 yamt write_bcm2835reg(BCM2835_INTC_ENABLEBASE + (irqbase >> 3), irq_mask); 182 1.2.4.2 yamt bcm2835_barrier(); 183 1.2.4.2 yamt } 184 1.2.4.2 yamt 185 1.2.4.2 yamt static void 186 1.2.4.2 yamt bcm2835_pic_block_irqs(struct pic_softc *pic, size_t irqbase, 187 1.2.4.2 yamt uint32_t irq_mask) 188 1.2.4.2 yamt { 189 1.2.4.2 yamt 190 1.2.4.2 yamt write_bcm2835reg(BCM2835_INTC_DISABLEBASE + (irqbase >> 3), irq_mask); 191 1.2.4.2 yamt bcm2835_barrier(); 192 1.2.4.2 yamt } 193 1.2.4.2 yamt 194 1.2.4.2 yamt /* 195 1.2.4.2 yamt * Called with interrupts disabled 196 1.2.4.2 yamt */ 197 1.2.4.2 yamt static int 198 1.2.4.2 yamt bcm2835_pic_find_pending_irqs(struct pic_softc *pic) 199 1.2.4.2 yamt { 200 1.2.4.2 yamt int ipl = 0; 201 1.2.4.2 yamt uint32_t bpending, gpu0irq, gpu1irq, armirq; 202 1.2.4.2 yamt 203 1.2.4.2 yamt bcm2835_barrier(); 204 1.2.4.2 yamt bpending = read_bcm2835reg(BCM2835_INTC_IRQBPENDING); 205 1.2.4.2 yamt if (bpending == 0) 206 1.2.4.2 yamt return 0; 207 1.2.4.2 yamt 208 1.2.4.2 yamt armirq = bpending & BCM2835_INTBIT_ARM; 209 1.2.4.2 yamt gpu0irq = bpending & BCM2835_INTBIT_GPU0; 210 1.2.4.2 yamt gpu1irq = bpending & BCM2835_INTBIT_GPU1; 211 1.2.4.2 yamt 212 1.2.4.2 yamt if (armirq) { 213 1.2.4.2 yamt ipl |= pic_mark_pending_sources(pic, BCM2835_INT_BASICBASE, 214 1.2.4.2 yamt armirq); 215 1.2.4.2 yamt 216 1.2.4.2 yamt } 217 1.2.4.2 yamt 218 1.2.4.2 yamt if (gpu0irq || (bpending & BCM2835_INTBIT_PENDING1)) { 219 1.2.4.2 yamt uint32_t pending1; 220 1.2.4.2 yamt 221 1.2.4.2 yamt pending1 = read_bcm2835reg(BCM2835_INTC_IRQ1PENDING); 222 1.2.4.2 yamt ipl |= pic_mark_pending_sources(pic, BCM2835_INT_GPU0BASE, 223 1.2.4.2 yamt pending1); 224 1.2.4.2 yamt } 225 1.2.4.2 yamt if (gpu1irq || (bpending & BCM2835_INTBIT_PENDING2)) { 226 1.2.4.2 yamt uint32_t pending2; 227 1.2.4.2 yamt 228 1.2.4.2 yamt pending2 = read_bcm2835reg(BCM2835_INTC_IRQ2PENDING); 229 1.2.4.2 yamt ipl |= pic_mark_pending_sources(pic, BCM2835_INT_GPU1BASE, 230 1.2.4.2 yamt pending2); 231 1.2.4.2 yamt } 232 1.2.4.2 yamt 233 1.2.4.2 yamt return ipl; 234 1.2.4.2 yamt } 235 1.2.4.2 yamt 236 1.2.4.2 yamt static void 237 1.2.4.2 yamt bcm2835_pic_establish_irq(struct pic_softc *pic, struct intrsource *is) 238 1.2.4.2 yamt { 239 1.2.4.2 yamt 240 1.2.4.2 yamt /* Nothing really*/ 241 1.2.4.2 yamt KASSERT(is->is_irq < BCM2835_NIRQ); 242 1.2.4.2 yamt KASSERT(is->is_type == IST_LEVEL); 243 1.2.4.2 yamt } 244 1.2.4.2 yamt 245 1.2.4.2 yamt static void 246 1.2.4.2 yamt bcm2835_pic_source_name(struct pic_softc *pic, int irq, char *buf, size_t len) 247 1.2.4.2 yamt { 248 1.2.4.2 yamt 249 1.2.4.2 yamt strlcpy(buf, bcm2835_sources[irq], len); 250 1.2.4.2 yamt } 251
Indexes created Wed Oct 22 06:10:02 GMT 2025