isv.c revision 1.1
1 /* $NetBSD: isv.c,v 1.1 2008/04/02 01:34:36 dyoung Exp $ */ 2 3 /*- 4 * Copyright (c) 2008 The NetBSD Foundation, Inc. 5 * All rights reserved. 6 * 7 * This code is derived from software contributed to The NetBSD Foundation 8 * by David Young. 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 * 3. All advertising materials mentioning features or use of this software 19 * must display the following acknowledgement: 20 * This product includes software developed by the NetBSD 21 * Foundation, Inc. and its contributors. 22 * 4. Neither the name of The NetBSD Foundation nor the names of its 23 * contributors may be used to endorse or promote products derived 24 * from this software without specific prior written permission. 25 * 26 * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS 27 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED 28 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 29 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS 30 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 31 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 32 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 33 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 34 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 35 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 36 * POSSIBILITY OF SUCH DAMAGE. 37 */ 38 39 #include <sys/cdefs.h> 40 __KERNEL_RCSID(0, "$NetBSD: isv.c,v 1.1 2008/04/02 01:34:36 dyoung Exp $"); 41 42 #include <sys/param.h> 43 #include <sys/systm.h> 44 #include <sys/kernel.h> 45 #include <sys/device.h> 46 #include <sys/conf.h> 47 #include <uvm/uvm.h> 48 49 #include <sys/bus.h> 50 51 #include <dev/isa/isareg.h> 52 #include <dev/isa/isavar.h> 53 54 #include <dev/isa/isvio.h> 55 56 #define ISV_CONTROL 0x0 /* control: write-only */ 57 #define ISV_CONTROL_MODE_MASK __BIT(0) 58 #define ISV_CONTROL_MODE_CAPTURE __SHIFTIN(0, ISV_CONTROL_MODE_MASK) 59 #define ISV_CONTROL_MODE_READ __SHIFTIN(1, ISV_CONTROL_MODE_MASK) 60 #define ISV_CONTROL_COUNTER_MASK __BIT(1) 61 #define ISV_CONTROL_COUNTER_RESET __SHIFTIN(1, ISV_CONTROL_COUNTER_MASK) 62 #define ISV_CONTROL_COUNTER_AUTOINC __SHIFTIN(0, ISV_CONTROL_COUNTER_MASK) 63 64 #define ISV_DATA ISV_CONTROL /* data: read-only */ 65 66 #define ISV_STATUS 0x2 /* status: read-only */ 67 #define ISV_STATUS_VIDEO_MASK __BIT(15) 68 #define ISV_STATUS_VIDEO_RETRACE __SHIFTIN(0, ISV_STATUS_VIDEO_MASK) 69 #define ISV_STATUS_VIDEO_WRITE __SHIFTIN(1, ISV_STATUS_VIDEO_MASK) 70 71 struct isv_regs { 72 bus_space_tag_t ir_bt; 73 bus_space_handle_t ir_bh; 74 }; 75 76 enum isv_state { 77 ISV_S_CAPTURE0 = 0 78 , ISV_S_CAPTURE1 = 1 79 , ISV_S_CAPTURE2 = 2 80 , ISV_S_RETRACE = 3 81 }; 82 83 struct isv_softc { 84 struct isv_regs sc_ir; 85 device_t sc_dev; 86 uint16_t *sc_frame; 87 int sc_speed; 88 }; 89 90 extern struct cfdriver isv_cd; 91 92 static dev_type_ioctl(isv_ioctl); 93 static dev_type_open(isv_open); 94 static dev_type_mmap(isv_mmap); 95 96 static int isv_capture(struct isv_softc *); 97 static int isv_match(device_t, cfdata_t, void *); 98 static void isv_attach(device_t, device_t, void *); 99 static int isv_detach(device_t, int); 100 static uint16_t isv_read(struct isv_regs *, bus_size_t); 101 static void isv_write(struct isv_regs *, bus_size_t, uint16_t); 102 static bool isv_retrace(struct isv_regs *); 103 static int isv_retrace_wait(struct isv_regs *, int *, 104 const struct timeval *); 105 static int isv_capture_wait(struct isv_regs *, int *, 106 const struct timeval *); 107 static bool isv_delta(int *, bool); 108 static int isv_probe(struct isv_regs *); 109 110 CFATTACH_DECL_NEW(isv_isa, sizeof(struct isv_softc), 111 isv_match, isv_attach, isv_detach, NULL); 112 113 const struct cdevsw isv_cdevsw = { 114 isv_open, nullclose, noread, nowrite, isv_ioctl, 115 nostop, notty, nopoll, isv_mmap, nokqfilter, D_OTHER 116 }; 117 118 static uint16_t 119 isv_read(struct isv_regs *ir, bus_size_t reg) 120 { 121 return bus_space_read_2(ir->ir_bt, ir->ir_bh, reg); 122 } 123 124 static void 125 isv_write(struct isv_regs *ir, bus_size_t reg, uint16_t val) 126 { 127 bus_space_write_2(ir->ir_bt, ir->ir_bh, reg, val); 128 } 129 130 static bool 131 isv_retrace(struct isv_regs *ir) 132 { 133 uint16_t video; 134 135 video = isv_read(ir, ISV_STATUS) & ISV_STATUS_VIDEO_MASK; 136 return video == ISV_STATUS_VIDEO_RETRACE; 137 } 138 139 #define state_and_input(__state, __retrace) \ 140 (((__state) << 1) | ((__retrace) ? 1 : 0)) 141 142 static bool 143 isv_delta(int *state, bool retrace) 144 { 145 bool transition = false; 146 147 switch (state_and_input(*state, retrace)) { 148 case state_and_input(ISV_S_CAPTURE0, false): 149 case state_and_input(ISV_S_RETRACE, true): 150 break; 151 case state_and_input(ISV_S_CAPTURE2, true): 152 transition = true; 153 /*FALLTHROUGH*/ 154 case state_and_input(ISV_S_CAPTURE1, true): 155 case state_and_input(ISV_S_CAPTURE0, true): 156 (*state)++; 157 break; 158 case state_and_input(ISV_S_RETRACE, false): 159 transition = true; 160 /*FALLTHROUGH*/ 161 case state_and_input(ISV_S_CAPTURE2, false): 162 case state_and_input(ISV_S_CAPTURE1, false): 163 *state = ISV_S_CAPTURE0; 164 break; 165 } 166 return transition; 167 } 168 169 static int 170 isv_probe(struct isv_regs *ir) 171 { 172 int state, transitions; 173 struct timeval end, now, 174 wait = {.tv_sec = 0, .tv_usec = 1000000 * 4 / 30}; 175 176 aprint_debug("%s: resetting\n", __func__); 177 isv_write(ir, ISV_CONTROL, 178 ISV_CONTROL_MODE_CAPTURE|ISV_CONTROL_COUNTER_AUTOINC); 179 180 aprint_debug("%s: waiting\n", __func__); 181 182 microtime(&now); 183 timeradd(&now, &wait, &end); 184 185 state = transitions = 0; 186 187 do { 188 if (isv_delta(&state, isv_retrace(ir))) 189 transitions++; 190 191 if (state == ISV_S_CAPTURE0 || state == ISV_S_RETRACE) 192 microtime(&now); 193 } while (timercmp(&now, &end, <)); 194 195 aprint_debug("%s: %d transitions\n", __func__, transitions); 196 197 return transitions >= 4 && transitions <= 10; 198 } 199 200 static int 201 isv_match(device_t parent, cfdata_t match, void *aux) 202 { 203 struct isv_regs ir; 204 struct isa_attach_args *ia = aux; 205 int rv; 206 207 /* Must supply an address */ 208 if (ia->ia_nio < 1 || ia->ia_io[0].ir_addr == ISA_UNKNOWN_PORT) 209 return 0; 210 211 ir.ir_bt = ia->ia_iot; 212 213 if (bus_space_map(ir.ir_bt, ia->ia_io[0].ir_addr, 8, 0, &ir.ir_bh)) 214 return 0; 215 216 rv = isv_probe(&ir); 217 218 bus_space_unmap(ir.ir_bt, ir.ir_bh, 8); 219 220 if (rv) { 221 ia->ia_nio = 1; 222 ia->ia_io[0].ir_size = 8; 223 224 ia->ia_niomem = 0; 225 ia->ia_nirq = 0; 226 ia->ia_ndrq = 0; 227 } 228 229 return rv; 230 } 231 232 233 static void 234 isv_attach(device_t parent, device_t self, void *aux) 235 { 236 struct isv_softc *sc = device_private(self); 237 struct isv_regs *ir = &sc->sc_ir; 238 struct isa_attach_args *ia = aux; 239 240 ir->ir_bt = ia->ia_iot; 241 242 if (bus_space_map(ir->ir_bt, ia->ia_io[0].ir_addr, 8, 0, &ir->ir_bh)) { 243 aprint_error(": can't map i/o space\n"); 244 return; 245 } 246 247 /* Bus-independent attachment */ 248 sc->sc_dev = self; 249 250 aprint_normal(": IDEC Supervision/16\n"); 251 252 /* TBD */ 253 } 254 255 int 256 isv_open(dev_t dev, int flag, int devtype, lwp_t *l) 257 { 258 vaddr_t va; 259 struct isv_softc *sc = device_lookup_private(&isv_cd, minor(dev)); 260 261 if (sc == NULL) 262 return ENXIO; 263 264 if (sc->sc_frame != NULL) 265 return 0; 266 267 if ((va = uvm_km_alloc(kernel_map, ISV_WIDTH * ISV_LINES, PAGE_SIZE, 268 UVM_KMF_WIRED|UVM_KMF_ZERO|UVM_KMF_CANFAIL|UVM_KMF_WAITVA)) == 0) 269 return ENOMEM; 270 271 sc->sc_frame = (uint16_t *)(void *)va; 272 return 0; 273 } 274 275 /* wait for retrace */ 276 static int 277 isv_retrace_wait(struct isv_regs *ir, int *state, const struct timeval *end) 278 { 279 struct timeval now; 280 281 for (;;) { 282 if (!isv_delta(state, isv_retrace(ir))) { 283 microtime(&now); 284 continue; 285 } 286 if (*state == ISV_S_RETRACE) 287 break; 288 if (*state != ISV_S_CAPTURE0) 289 continue; 290 291 microtime(&now); 292 if (timercmp(&now, end, >=)) 293 return EIO; 294 } 295 return 0; 296 } 297 298 /* wait for capture mode */ 299 static int 300 isv_capture_wait(struct isv_regs *ir, int *state, const struct timeval *end) 301 { 302 struct timeval now; 303 304 for (;;) { 305 if (!isv_delta(state, isv_retrace(ir))) { 306 microtime(&now); 307 continue; 308 } 309 if (*state != ISV_S_RETRACE) 310 break; 311 312 microtime(&now); 313 if (timercmp(&now, end, >=)) 314 return EIO; 315 } 316 return 0; 317 } 318 319 320 static int 321 isv_capture(struct isv_softc *sc) 322 { 323 int speed; 324 uint16_t discard; 325 int rc, state = ISV_S_CAPTURE0; 326 struct timeval diff, end, start, stop; 327 static const struct timeval wait = {.tv_sec = 0, .tv_usec = 200000}; 328 struct isv_regs *ir = &sc->sc_ir; 329 330 if (sc->sc_frame == NULL) 331 return EAGAIN; 332 333 microtime(&start); 334 335 timeradd(&start, &wait, &end); 336 337 speed = sc->sc_speed; 338 sc->sc_speed = 0; 339 340 if (speed < 1 && (rc = isv_retrace_wait(ir, &state, &end)) != 0) 341 return rc; 342 343 if (speed < 2 && (rc = isv_capture_wait(ir, &state, &end)) != 0) 344 return rc; 345 346 if ((rc = isv_retrace_wait(ir, &state, &end)) != 0) 347 return rc; 348 349 microtime(&stop); 350 351 timersub(&stop, &start, &diff); 352 353 aprint_debug_dev(sc->sc_dev, "%ssync in %ld.%06ld seconds\n", 354 (speed < 1) ? "" : ((speed < 2) ? "faster " : "fastest "), 355 diff.tv_sec, diff.tv_usec); 356 357 microtime(&start); 358 359 /* enter read mode, then toggle counter mode, 360 * autoinc -> reset -> autoinc, so that we start reading 361 * at the top of the frame. 362 */ 363 isv_write(ir, ISV_CONTROL, 364 ISV_CONTROL_MODE_READ|ISV_CONTROL_COUNTER_AUTOINC); 365 isv_write(ir, ISV_CONTROL, 366 ISV_CONTROL_MODE_READ|ISV_CONTROL_COUNTER_RESET); 367 isv_write(ir, ISV_CONTROL, 368 ISV_CONTROL_MODE_READ|ISV_CONTROL_COUNTER_AUTOINC); 369 /* read one dummy word to prime the state machine on the 370 * image capture board 371 */ 372 discard = isv_read(ir, ISV_DATA); 373 bus_space_read_multi_stream_2(ir->ir_bt, ir->ir_bh, ISV_DATA, 374 sc->sc_frame, ISV_WIDTH * ISV_LINES / 2); 375 376 /* restore to initial conditions */ 377 isv_write(ir, ISV_CONTROL, 378 ISV_CONTROL_MODE_CAPTURE|ISV_CONTROL_COUNTER_AUTOINC); 379 380 microtime(&stop); 381 382 timersub(&stop, &start, &diff); 383 384 aprint_debug_dev(sc->sc_dev, "read in %ld.%06ld seconds\n", 385 diff.tv_sec, diff.tv_usec); 386 387 state = 0; 388 389 if (isv_retrace_wait(ir, &state, &end) != 0) 390 return 0; 391 sc->sc_speed++; 392 393 if (isv_capture_wait(ir, &state, &end) != 0) 394 return 0; 395 sc->sc_speed++; 396 397 return 0; 398 } 399 400 int 401 isv_ioctl(dev_t dev, u_long cmd, void *data, int flag, lwp_t *l) 402 { 403 struct isv_cmd ic; 404 struct isv_softc *sc = device_lookup_private(&isv_cd, minor(dev)); 405 406 if (cmd != ISV_CMD) 407 return ENOTTY; 408 409 memcpy(&ic, data, sizeof(ic)); 410 411 if (ic.c_cmd != ISV_CMD_READ) 412 return EINVAL; 413 414 ic.c_frameno = 0; 415 416 return isv_capture(sc); 417 } 418 419 paddr_t 420 isv_mmap(dev_t dev, off_t offset, int prot) 421 { 422 struct isv_softc *sc = device_lookup_private(&isv_cd, minor(dev)); 423 paddr_t pa; 424 425 if ((prot & ~(VM_PROT_READ)) != 0) 426 return -1; 427 428 if (sc->sc_frame == NULL) 429 return -1; 430 431 if (offset >= ISV_WIDTH * ISV_LINES) 432 return -1; 433 434 if (!pmap_extract(pmap_kernel(), (vaddr_t)&sc->sc_frame[offset/2], &pa)) 435 return -1; 436 437 return atop(pa); 438 } 439 440 static int 441 isv_detach(device_t self, int flags) 442 { 443 struct isv_softc *sc = device_private(self); 444 struct isv_regs *ir = &sc->sc_ir; 445 446 if (sc->sc_frame != NULL) { 447 uvm_km_free(kernel_map, (vaddr_t)sc->sc_frame, 448 ISV_WIDTH * ISV_LINES, UVM_KMF_WIRED); 449 } 450 bus_space_unmap(ir->ir_bt, ir->ir_bh, 8); 451 return 0; 452 } 453
Indexes created Mon Sep 22 13:09:51 GMT 2025