1 /*- 2 * Copyright (c) 2012 Ganbold Tsagaankhuu <ganbold@freebsd.org> 3 * Copyright (c) 2016 Emmanuel Vadot <manu@freebsd.org> 4 * All rights reserved. 5 * 6 * Redistribution and use in source and binary forms, with or without 7 * modification, are permitted provided that the following conditions 8 * are met: 9 * 1. Redistributions of source code must retain the above copyright 10 * notice, this list of conditions and the following disclaimer. 11 * 2. Redistributions in binary form must reproduce the above copyright 12 * notice, this list of conditions and the following disclaimer in the 13 * documentation and/or other materials provided with the distribution. 14 * 15 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 16 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 17 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 18 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 19 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 20 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 21 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 22 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 23 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 24 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 25 * SUCH DAMAGE. 26 */ 27 28 #include <sys/cdefs.h> 29 __FBSDID("$FreeBSD$"); 30 31 #include "opt_platform.h" 32 33 #include <sys/types.h> 34 #include <sys/bus.h> 35 #include <sys/cpuset.h> 36 #include <sys/kernel.h> 37 #include <sys/ktr.h> 38 #include <sys/module.h> 39 #include <sys/mutex.h> 40 #include <sys/param.h> 41 #include <sys/pcpu.h> 42 #include <sys/proc.h> 43 #include <sys/rman.h> 44 #include <sys/smp.h> 45 #include <sys/systm.h> 46 #include <sys/sched.h> 47 #include <machine/bus.h> 48 #include <machine/intr.h> 49 50 #include <dev/ofw/openfirm.h> 51 #include <dev/ofw/ofw_bus.h> 52 #include <dev/ofw/ofw_bus_subr.h> 53 54 #include "pic_if.h" 55 56 /** 57 * Interrupt controller registers 58 * 59 */ 60 #define SW_INT_VECTOR_REG 0x00 61 #define SW_INT_BASE_ADR_REG 0x04 62 #define SW_INT_PROTECTION_REG 0x08 63 #define SW_INT_NMI_CTRL_REG 0x0c 64 65 #define SW_INT_IRQ_PENDING_REG0 0x10 66 #define SW_INT_IRQ_PENDING_REG1 0x14 67 #define SW_INT_IRQ_PENDING_REG2 0x18 68 69 #define SW_INT_FIQ_PENDING_REG0 0x20 70 #define SW_INT_FIQ_PENDING_REG1 0x24 71 #define SW_INT_FIQ_PENDING_REG2 0x28 72 73 #define SW_INT_SELECT_REG0 0x30 74 #define SW_INT_SELECT_REG1 0x34 75 #define SW_INT_SELECT_REG2 0x38 76 77 #define SW_INT_ENABLE_REG0 0x40 78 #define SW_INT_ENABLE_REG1 0x44 79 #define SW_INT_ENABLE_REG2 0x48 80 81 #define SW_INT_MASK_REG0 0x50 82 #define SW_INT_MASK_REG1 0x54 83 #define SW_INT_MASK_REG2 0x58 84 85 #define SW_INT_IRQNO_ENMI 0 86 87 #define A10_INTR_MAX_NIRQS 81 88 89 #define SW_INT_IRQ_PENDING_REG(_b) (0x10 + ((_b) * 4)) 90 #define SW_INT_FIQ_PENDING_REG(_b) (0x20 + ((_b) * 4)) 91 #define SW_INT_SELECT_REG(_b) (0x30 + ((_b) * 4)) 92 #define SW_INT_ENABLE_REG(_b) (0x40 + ((_b) * 4)) 93 #define SW_INT_MASK_REG(_b) (0x50 + ((_b) * 4)) 94 95 struct a10_intr_irqsrc { 96 struct intr_irqsrc isrc; 97 u_int irq; 98 }; 99 100 struct a10_aintc_softc { 101 device_t sc_dev; 102 struct resource * aintc_res; 103 bus_space_tag_t aintc_bst; 104 bus_space_handle_t aintc_bsh; 105 struct mtx mtx; 106 struct a10_intr_irqsrc isrcs[A10_INTR_MAX_NIRQS]; 107 }; 108 109 #define aintc_read_4(sc, reg) \ 110 bus_space_read_4(sc->aintc_bst, sc->aintc_bsh, reg) 111 #define aintc_write_4(sc, reg, val) \ 112 bus_space_write_4(sc->aintc_bst, sc->aintc_bsh, reg, val) 113 114 static __inline void 115 a10_intr_eoi(struct a10_aintc_softc *sc, u_int irq) 116 { 117 118 if (irq != SW_INT_IRQNO_ENMI) 119 return; 120 mtx_lock_spin(&sc->mtx); 121 aintc_write_4(sc, SW_INT_IRQ_PENDING_REG(0), 122 (1 << SW_INT_IRQNO_ENMI)); 123 mtx_unlock_spin(&sc->mtx); 124 } 125 126 static void 127 a10_intr_unmask(struct a10_aintc_softc *sc, u_int irq) 128 { 129 uint32_t bit, block, value; 130 131 bit = (irq % 32); 132 block = (irq / 32); 133 134 mtx_lock_spin(&sc->mtx); 135 value = aintc_read_4(sc, SW_INT_ENABLE_REG(block)); 136 value |= (1 << bit); 137 aintc_write_4(sc, SW_INT_ENABLE_REG(block), value); 138 139 value = aintc_read_4(sc, SW_INT_MASK_REG(block)); 140 value &= ~(1 << bit); 141 aintc_write_4(sc, SW_INT_MASK_REG(block), value); 142 mtx_unlock_spin(&sc->mtx); 143 } 144 145 static void 146 a10_intr_mask(struct a10_aintc_softc *sc, u_int irq) 147 { 148 uint32_t bit, block, value; 149 150 bit = (irq % 32); 151 block = (irq / 32); 152 153 mtx_lock_spin(&sc->mtx); 154 value = aintc_read_4(sc, SW_INT_ENABLE_REG(block)); 155 value &= ~(1 << bit); 156 aintc_write_4(sc, SW_INT_ENABLE_REG(block), value); 157 158 value = aintc_read_4(sc, SW_INT_MASK_REG(block)); 159 value |= (1 << bit); 160 aintc_write_4(sc, SW_INT_MASK_REG(block), value); 161 mtx_unlock_spin(&sc->mtx); 162 } 163 164 static int 165 a10_pending_irq(struct a10_aintc_softc *sc) 166 { 167 uint32_t value; 168 int i, b; 169 170 for (i = 0; i < 3; i++) { 171 value = aintc_read_4(sc, SW_INT_IRQ_PENDING_REG(i)); 172 if (value == 0) 173 continue; 174 for (b = 0; b < 32; b++) 175 if (value & (1 << b)) { 176 return (i * 32 + b); 177 } 178 } 179 180 return (-1); 181 } 182 183 static int 184 a10_intr(void *arg) 185 { 186 struct a10_aintc_softc *sc = arg; 187 u_int irq; 188 189 irq = a10_pending_irq(sc); 190 if (irq == -1 || irq > A10_INTR_MAX_NIRQS) { 191 device_printf(sc->sc_dev, "Spurious interrupt %d\n", irq); 192 return (FILTER_HANDLED); 193 } 194 195 while (irq != -1) { 196 if (irq > A10_INTR_MAX_NIRQS) { 197 device_printf(sc->sc_dev, "Spurious interrupt %d\n", 198 irq); 199 return (FILTER_HANDLED); 200 } 201 if (intr_isrc_dispatch(&sc->isrcs[irq].isrc, 202 curthread->td_intr_frame) != 0) { 203 a10_intr_mask(sc, irq); 204 a10_intr_eoi(sc, irq); 205 device_printf(sc->sc_dev, 206 "Stray interrupt %d disabled\n", irq); 207 } 208 209 arm_irq_memory_barrier(irq); 210 irq = a10_pending_irq(sc); 211 } 212 213 return (FILTER_HANDLED); 214 } 215 216 static int 217 a10_intr_pic_attach(struct a10_aintc_softc *sc) 218 { 219 struct intr_pic *pic; 220 int error; 221 uint32_t irq; 222 const char *name; 223 intptr_t xref; 224 225 name = device_get_nameunit(sc->sc_dev); 226 for (irq = 0; irq < A10_INTR_MAX_NIRQS; irq++) { 227 sc->isrcs[irq].irq = irq; 228 229 error = intr_isrc_register(&sc->isrcs[irq].isrc, 230 sc->sc_dev, 0, "%s,%u", name, irq); 231 if (error != 0) 232 return (error); 233 } 234 235 xref = OF_xref_from_node(ofw_bus_get_node(sc->sc_dev)); 236 pic = intr_pic_register(sc->sc_dev, xref); 237 if (pic == NULL) 238 return (ENXIO); 239 240 return (intr_pic_claim_root(sc->sc_dev, xref, a10_intr, sc, 0)); 241 } 242 243 static void 244 a10_intr_enable_intr(device_t dev, struct intr_irqsrc *isrc) 245 { 246 struct a10_aintc_softc *sc; 247 u_int irq = ((struct a10_intr_irqsrc *)isrc)->irq; 248 249 sc = device_get_softc(dev); 250 arm_irq_memory_barrier(irq); 251 a10_intr_unmask(sc, irq); 252 } 253 254 static void 255 a10_intr_disable_intr(device_t dev, struct intr_irqsrc *isrc) 256 { 257 struct a10_aintc_softc *sc; 258 u_int irq = ((struct a10_intr_irqsrc *)isrc)->irq; 259 260 sc = device_get_softc(dev); 261 a10_intr_mask(sc, irq); 262 } 263 264 static int 265 a10_intr_map_intr(device_t dev, struct intr_map_data *data, 266 struct intr_irqsrc **isrcp) 267 { 268 struct intr_map_data_fdt *daf; 269 struct a10_aintc_softc *sc; 270 271 if (data->type != INTR_MAP_DATA_FDT) 272 return (ENOTSUP); 273 274 daf = (struct intr_map_data_fdt *)data; 275 if (daf->ncells != 1 || daf->cells[0] >= A10_INTR_MAX_NIRQS) 276 return (EINVAL); 277 278 sc = device_get_softc(dev); 279 *isrcp = &sc->isrcs[daf->cells[0]].isrc; 280 return (0); 281 } 282 283 static void 284 a10_intr_pre_ithread(device_t dev, struct intr_irqsrc *isrc) 285 { 286 struct a10_aintc_softc *sc = device_get_softc(dev); 287 u_int irq = ((struct a10_intr_irqsrc *)isrc)->irq; 288 289 a10_intr_mask(sc, irq); 290 a10_intr_eoi(sc, irq); 291 } 292 293 static void 294 a10_intr_post_ithread(device_t dev, struct intr_irqsrc *isrc) 295 { 296 297 a10_intr_enable_intr(dev, isrc); 298 } 299 300 static void 301 a10_intr_post_filter(device_t dev, struct intr_irqsrc *isrc) 302 { 303 struct a10_aintc_softc *sc = device_get_softc(dev); 304 u_int irq = ((struct a10_intr_irqsrc *)isrc)->irq; 305 306 a10_intr_eoi(sc, irq); 307 } 308 309 static int 310 a10_aintc_probe(device_t dev) 311 { 312 313 if (!ofw_bus_status_okay(dev)) 314 return (ENXIO); 315 316 if (!ofw_bus_is_compatible(dev, "allwinner,sun4i-a10-ic")) 317 return (ENXIO); 318 device_set_desc(dev, "A10 AINTC Interrupt Controller"); 319 return (BUS_PROBE_DEFAULT); 320 } 321 322 static int 323 a10_aintc_attach(device_t dev) 324 { 325 struct a10_aintc_softc *sc = device_get_softc(dev); 326 int rid = 0; 327 int i; 328 sc->sc_dev = dev; 329 330 sc->aintc_res = bus_alloc_resource_any(dev, SYS_RES_MEMORY, 331 &rid, RF_ACTIVE); 332 if (!sc->aintc_res) { 333 device_printf(dev, "could not allocate resource\n"); 334 goto error; 335 } 336 337 sc->aintc_bst = rman_get_bustag(sc->aintc_res); 338 sc->aintc_bsh = rman_get_bushandle(sc->aintc_res); 339 340 mtx_init(&sc->mtx, "A10 AINTC lock", "", MTX_SPIN); 341 342 /* Disable & clear all interrupts */ 343 for (i = 0; i < 3; i++) { 344 aintc_write_4(sc, SW_INT_ENABLE_REG(i), 0); 345 aintc_write_4(sc, SW_INT_MASK_REG(i), 0xffffffff); 346 } 347 /* enable protection mode*/ 348 aintc_write_4(sc, SW_INT_PROTECTION_REG, 0x01); 349 350 /* config the external interrupt source type*/ 351 aintc_write_4(sc, SW_INT_NMI_CTRL_REG, 0x00); 352 353 if (a10_intr_pic_attach(sc) != 0) { 354 device_printf(dev, "could not attach PIC\n"); 355 return (ENXIO); 356 } 357 358 return (0); 359 360 error: 361 bus_release_resource(dev, SYS_RES_MEMORY, rid, 362 sc->aintc_res); 363 return (ENXIO); 364 } 365 366 static device_method_t a10_aintc_methods[] = { 367 DEVMETHOD(device_probe, a10_aintc_probe), 368 DEVMETHOD(device_attach, a10_aintc_attach), 369 370 /* Interrupt controller interface */ 371 DEVMETHOD(pic_disable_intr, a10_intr_disable_intr), 372 DEVMETHOD(pic_enable_intr, a10_intr_enable_intr), 373 DEVMETHOD(pic_map_intr, a10_intr_map_intr), 374 DEVMETHOD(pic_post_filter, a10_intr_post_filter), 375 DEVMETHOD(pic_post_ithread, a10_intr_post_ithread), 376 DEVMETHOD(pic_pre_ithread, a10_intr_pre_ithread), 377 378 { 0, 0 } 379 }; 380 381 static driver_t a10_aintc_driver = { 382 "aintc", 383 a10_aintc_methods, 384 sizeof(struct a10_aintc_softc), 385 }; 386 387 static devclass_t a10_aintc_devclass; 388 389 EARLY_DRIVER_MODULE(aintc, simplebus, a10_aintc_driver, a10_aintc_devclass, 0, 0, 390 BUS_PASS_INTERRUPT + BUS_PASS_ORDER_FIRST); 391