1 /* $NetBSD: voyager.c,v 1.10 2014/03/29 19:28:25 christos Exp $ */ 2 3 /* 4 * Copyright (c) 2009, 2011 Michael Lorenz 5 * All rights reserved. 6 * 7 * Redistribution and use in source and binary forms, with or without 8 * modification, are permitted provided that the following conditions 9 * are met: 10 * 1. Redistributions of source code must retain the above copyright 11 * notice, this list of conditions and the following disclaimer. 12 * 2. Redistributions in binary form must reproduce the above copyright 13 * notice, this list of conditions and the following disclaimer in the 14 * documentation and/or other materials provided with the distribution. 15 * 16 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR 17 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES 18 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 19 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, 20 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT 21 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 22 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 23 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 24 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF 25 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 26 */ 27 28 #include <sys/cdefs.h> 29 __KERNEL_RCSID(0, "$NetBSD: voyager.c,v 1.10 2014/03/29 19:28:25 christos Exp $"); 30 31 #include <sys/param.h> 32 #include <sys/systm.h> 33 #include <sys/kernel.h> 34 #include <sys/device.h> 35 #include <sys/malloc.h> 36 #include <sys/lwp.h> 37 #include <sys/kauth.h> 38 39 #include <dev/pci/pcivar.h> 40 #include <dev/pci/pcireg.h> 41 #include <dev/pci/pcidevs.h> 42 #include <dev/pci/pciio.h> 43 #include <dev/ic/sm502reg.h> 44 #include <dev/i2c/i2cvar.h> 45 #include <dev/i2c/i2c_bitbang.h> 46 47 #include <sys/evcnt.h> 48 #include <sys/bitops.h> 49 50 #include <dev/pci/voyagervar.h> 51 52 #include "opt_voyager.h" 53 #include "voyagerfb.h" 54 #include "pwmclock.h" 55 56 #ifdef VOYAGER_DEBUG 57 #define DPRINTF aprint_normal 58 #else 59 #define DPRINTF while (0) printf 60 #endif 61 62 /* interrupt stuff */ 63 struct voyager_intr { 64 int (*vih_func)(void *); 65 void *vih_arg; 66 struct evcnt vih_count; 67 char vih_name[32]; 68 }; 69 70 struct voyager_softc { 71 device_t sc_dev; 72 73 pci_chipset_tag_t sc_pc; 74 pcitag_t sc_pcitag; 75 76 bus_space_tag_t sc_memt; 77 bus_space_tag_t sc_iot; 78 79 bus_space_handle_t sc_fbh, sc_regh; 80 bus_addr_t sc_fb, sc_reg; 81 bus_size_t sc_fbsize, sc_regsize; 82 83 struct i2c_controller sc_i2c; 84 kmutex_t sc_i2c_lock; 85 86 /* interrupt dispatcher */ 87 void *sc_ih; 88 struct voyager_intr sc_intrs[32]; 89 }; 90 91 static int voyager_match(device_t, cfdata_t, void *); 92 static void voyager_attach(device_t, device_t, void *); 93 static int voyager_print(void *, const char *); 94 static int voyager_intr(void *); 95 96 CFATTACH_DECL_NEW(voyager, sizeof(struct voyager_softc), 97 voyager_match, voyager_attach, NULL, NULL); 98 99 /* I2C glue */ 100 static int voyager_i2c_acquire_bus(void *, int); 101 static void voyager_i2c_release_bus(void *, int); 102 static int voyager_i2c_send_start(void *, int); 103 static int voyager_i2c_send_stop(void *, int); 104 static int voyager_i2c_initiate_xfer(void *, i2c_addr_t, int); 105 static int voyager_i2c_read_byte(void *, uint8_t *, int); 106 static int voyager_i2c_write_byte(void *, uint8_t, int); 107 108 /* I2C bitbang glue */ 109 static void voyager_i2cbb_set_bits(void *, uint32_t); 110 static void voyager_i2cbb_set_dir(void *, uint32_t); 111 static uint32_t voyager_i2cbb_read(void *); 112 113 static const struct i2c_bitbang_ops voyager_i2cbb_ops = { 114 voyager_i2cbb_set_bits, 115 voyager_i2cbb_set_dir, 116 voyager_i2cbb_read, 117 { 118 1 << 13, 119 1 << 6, 120 1 << 13, 121 0 122 } 123 }; 124 #define GPIO_I2C_BITS ((1 << 6) | (1 << 13)) 125 126 #ifdef VOYAGER_DEBUG 127 static void voyager_print_pwm(struct voyager_softc *, int); 128 #endif 129 130 static int 131 voyager_match(device_t parent, cfdata_t match, void *aux) 132 { 133 struct pci_attach_args *pa = (struct pci_attach_args *)aux; 134 135 if (PCI_CLASS(pa->pa_class) != PCI_CLASS_DISPLAY) 136 return 0; 137 if (PCI_VENDOR(pa->pa_id) != PCI_VENDOR_SILMOTION) 138 return 0; 139 140 /* only chip tested on so far - may need a list */ 141 if (PCI_PRODUCT(pa->pa_id) == PCI_PRODUCT_SILMOTION_SM502) 142 return 100; 143 return (0); 144 } 145 146 static void 147 voyager_attach(device_t parent, device_t self, void *aux) 148 { 149 struct voyager_softc *sc = device_private(self); 150 struct pci_attach_args *pa = aux; 151 pci_intr_handle_t ih; 152 struct voyager_attach_args vaa; 153 struct i2cbus_attach_args iba; 154 uint32_t reg; 155 const char *intrstr; 156 int i; 157 char intrbuf[PCI_INTRSTR_LEN]; 158 159 sc->sc_pc = pa->pa_pc; 160 sc->sc_pcitag = pa->pa_tag; 161 sc->sc_memt = pa->pa_memt; 162 sc->sc_iot = pa->pa_iot; 163 sc->sc_dev = self; 164 165 pci_aprint_devinfo(pa, NULL); 166 167 if (pci_mapreg_map(pa, 0x14, PCI_MAPREG_TYPE_MEM, 0, 168 &sc->sc_memt, &sc->sc_regh, &sc->sc_reg, &sc->sc_regsize)) { 169 aprint_error("%s: failed to map registers.\n", 170 device_xname(sc->sc_dev)); 171 } 172 173 if (pci_mapreg_map(pa, 0x10, PCI_MAPREG_TYPE_MEM, 174 BUS_SPACE_MAP_LINEAR, 175 &sc->sc_memt, &sc->sc_fbh, &sc->sc_fb, &sc->sc_fbsize)) { 176 aprint_error("%s: failed to map the frame buffer.\n", 177 device_xname(sc->sc_dev)); 178 } 179 180 /* disable all interrupts */ 181 bus_space_write_4(sc->sc_memt, sc->sc_regh, SM502_INTR_MASK, 0); 182 183 /* initialize handler list */ 184 for (i = 0; i < 32; i++) { 185 sc->sc_intrs[i].vih_func = NULL; 186 snprintf(sc->sc_intrs[i].vih_name, 32, "int %d", i); 187 evcnt_attach_dynamic(&sc->sc_intrs[i].vih_count, 188 EVCNT_TYPE_INTR, NULL, "voyager", sc->sc_intrs[i].vih_name); 189 } 190 191 /* Map and establish the interrupt. */ 192 if (pci_intr_map(pa, &ih)) { 193 aprint_error_dev(self, "couldn't map interrupt\n"); 194 return; 195 } 196 197 intrstr = pci_intr_string(sc->sc_pc, ih, intrbuf, sizeof(intrbuf)); 198 sc->sc_ih = pci_intr_establish(sc->sc_pc, ih, IPL_AUDIO, voyager_intr, sc); 199 if (sc->sc_ih == NULL) { 200 aprint_error_dev(self, "couldn't establish interrupt"); 201 if (intrstr != NULL) 202 aprint_error(" at %s", intrstr); 203 aprint_error("\n"); 204 return; 205 } 206 aprint_normal_dev(self, "interrupting at %s\n", intrstr); 207 208 #ifdef VOYAGER_DEBUG 209 voyager_print_pwm(sc, SM502_PWM0); 210 voyager_print_pwm(sc, SM502_PWM1); 211 voyager_print_pwm(sc, SM502_PWM2); 212 #endif 213 214 /* attach the framebuffer driver */ 215 vaa.vaa_memh = sc->sc_fbh; 216 vaa.vaa_mem_pa = sc->sc_fb; 217 vaa.vaa_regh = sc->sc_regh; 218 vaa.vaa_reg_pa = sc->sc_reg; 219 vaa.vaa_tag = sc->sc_memt; 220 vaa.vaa_pc = sc->sc_pc; 221 vaa.vaa_pcitag = sc->sc_pcitag; 222 #if NVOYAGERFB > 0 223 strcpy(vaa.vaa_name, "voyagerfb"); 224 config_found_ia(sc->sc_dev, "voyagerbus", &vaa, voyager_print); 225 #endif 226 #if NPWMCLOCK > 0 227 strcpy(vaa.vaa_name, "pwmclock"); 228 config_found_ia(sc->sc_dev, "voyagerbus", &vaa, voyager_print); 229 #endif 230 #ifdef notyet 231 strcpy(vaa.vaa_name, "vac"); 232 config_found_ia(sc->sc_dev, "voyagerbus", &vaa, voyager_print); 233 #endif 234 /* we use this mutex wether there's an i2c bus or not */ 235 mutex_init(&sc->sc_i2c_lock, MUTEX_DEFAULT, IPL_NONE); 236 237 /* 238 * see if the i2c pins are configured as gpio and if so, use them 239 * should probably be a compile time option 240 */ 241 reg = bus_space_read_4(sc->sc_memt, sc->sc_regh, SM502_GPIO0_CONTROL); 242 if ((reg & GPIO_I2C_BITS) == 0) { 243 /* both bits as outputs */ 244 voyager_gpio_dir(sc, 0xffffffff, GPIO_I2C_BITS); 245 246 /* Fill in the i2c tag */ 247 sc->sc_i2c.ic_cookie = sc; 248 sc->sc_i2c.ic_acquire_bus = voyager_i2c_acquire_bus; 249 sc->sc_i2c.ic_release_bus = voyager_i2c_release_bus; 250 sc->sc_i2c.ic_send_start = voyager_i2c_send_start; 251 sc->sc_i2c.ic_send_stop = voyager_i2c_send_stop; 252 sc->sc_i2c.ic_initiate_xfer = voyager_i2c_initiate_xfer; 253 sc->sc_i2c.ic_read_byte = voyager_i2c_read_byte; 254 sc->sc_i2c.ic_write_byte = voyager_i2c_write_byte; 255 sc->sc_i2c.ic_exec = NULL; 256 iba.iba_tag = &sc->sc_i2c; 257 config_found_ia(self, "i2cbus", &iba, iicbus_print); 258 } 259 voyager_control_gpio(sc, ~(1 << 16), 0); 260 voyager_gpio_dir(sc, 0xffffffff, 1 << 16); 261 voyager_write_gpio(sc, 0xffffffff, 1 << 16); 262 } 263 264 static int 265 voyager_print(void *aux, const char *what) 266 { 267 /*struct voyager_attach_args *vaa = aux;*/ 268 269 if (what == NULL) 270 return 0; 271 272 printf("%s:", what); 273 274 return 0; 275 } 276 277 static void 278 voyager_i2cbb_set_bits(void *cookie, uint32_t bits) 279 { 280 struct voyager_softc *sc = cookie; 281 uint32_t reg; 282 283 reg = bus_space_read_4(sc->sc_memt, sc->sc_regh, SM502_GPIO_DATA0); 284 reg &= ~GPIO_I2C_BITS; 285 reg |= bits; 286 bus_space_write_4(sc->sc_memt, sc->sc_regh, SM502_GPIO_DATA0, reg); 287 } 288 289 static void 290 voyager_i2cbb_set_dir(void *cookie, uint32_t bits) 291 { 292 struct voyager_softc *sc = cookie; 293 uint32_t reg; 294 295 reg = bus_space_read_4(sc->sc_memt, sc->sc_regh, SM502_GPIO_DIR0); 296 reg &= ~(1 << 13); 297 reg |= bits; 298 bus_space_write_4(sc->sc_memt, sc->sc_regh, SM502_GPIO_DIR0, reg); 299 } 300 301 static uint32_t 302 voyager_i2cbb_read(void *cookie) 303 { 304 struct voyager_softc *sc = cookie; 305 uint32_t reg; 306 307 reg = bus_space_read_4(sc->sc_memt, sc->sc_regh, SM502_GPIO_DATA0); 308 return reg; 309 } 310 311 /* higher level I2C stuff */ 312 static int 313 voyager_i2c_acquire_bus(void *cookie, int flags) 314 { 315 struct voyager_softc *sc = cookie; 316 317 mutex_enter(&sc->sc_i2c_lock); 318 return 0; 319 } 320 321 static void 322 voyager_i2c_release_bus(void *cookie, int flags) 323 { 324 struct voyager_softc *sc = cookie; 325 326 mutex_exit(&sc->sc_i2c_lock); 327 } 328 329 static int 330 voyager_i2c_send_start(void *cookie, int flags) 331 { 332 return (i2c_bitbang_send_start(cookie, flags, &voyager_i2cbb_ops)); 333 } 334 335 static int 336 voyager_i2c_send_stop(void *cookie, int flags) 337 { 338 339 return (i2c_bitbang_send_stop(cookie, flags, &voyager_i2cbb_ops)); 340 } 341 342 static int 343 voyager_i2c_initiate_xfer(void *cookie, i2c_addr_t addr, int flags) 344 { 345 /* 346 * for some reason i2c_bitbang_initiate_xfer left-shifts 347 * the I2C-address and then sets the direction bit 348 */ 349 return (i2c_bitbang_initiate_xfer(cookie, addr, flags, 350 &voyager_i2cbb_ops)); 351 } 352 353 static int 354 voyager_i2c_read_byte(void *cookie, uint8_t *valp, int flags) 355 { 356 int ret; 357 358 ret = i2c_bitbang_read_byte(cookie, valp, flags, &voyager_i2cbb_ops); 359 return ret; 360 } 361 362 static int 363 voyager_i2c_write_byte(void *cookie, uint8_t val, int flags) 364 { 365 int ret; 366 367 ret = i2c_bitbang_write_byte(cookie, val, flags, &voyager_i2cbb_ops); 368 delay(500); 369 return ret; 370 } 371 372 void 373 voyager_twiddle_bits(void *cookie, int regnum, uint32_t mask, uint32_t bits) 374 { 375 struct voyager_softc *sc = cookie; 376 uint32_t reg; 377 378 /* don't interfere with i2c ops */ 379 mutex_enter(&sc->sc_i2c_lock); 380 reg = bus_space_read_4(sc->sc_memt, sc->sc_regh, regnum); 381 reg &= mask; 382 reg |= bits; 383 bus_space_write_4(sc->sc_memt, sc->sc_regh, regnum, reg); 384 mutex_exit(&sc->sc_i2c_lock); 385 } 386 387 static int 388 voyager_intr(void *cookie) 389 { 390 struct voyager_softc *sc = cookie; 391 struct voyager_intr *ih; 392 uint32_t intrs; 393 uint32_t mask, bit; 394 int num; 395 396 intrs = bus_space_read_4(sc->sc_memt, sc->sc_regh, SM502_INTR_STATUS); 397 mask = bus_space_read_4(sc->sc_memt, sc->sc_regh, SM502_INTR_MASK); 398 intrs &= mask; 399 400 while (intrs != 0) { 401 num = ffs32(intrs) - 1; 402 bit = 1 << num; 403 intrs &= ~bit; 404 ih = &sc->sc_intrs[num]; 405 if (ih->vih_func != NULL) { 406 ih->vih_func(ih->vih_arg); 407 } 408 ih->vih_count.ev_count++; 409 } 410 return 0; 411 } 412 413 void * 414 voyager_establish_intr(device_t dev, int bit, int (*handler)(void *), void *arg) 415 { 416 struct voyager_softc *sc = device_private(dev); 417 struct voyager_intr *ih; 418 uint32_t reg; 419 420 if ((bit < 0) || (bit > 31)) { 421 aprint_error_dev(dev, "bogus interrupt %d\n", bit); 422 return NULL; 423 } 424 425 ih = &sc->sc_intrs[bit]; 426 if (ih->vih_func != NULL) { 427 aprint_error_dev(dev, "interrupt %d is already in use\n", bit); 428 return NULL; 429 } 430 ih->vih_func = handler; 431 ih->vih_arg = arg; 432 reg = bus_space_read_4(sc->sc_memt, sc->sc_regh, SM502_INTR_MASK); 433 reg |= 1 << bit; 434 bus_space_write_4(sc->sc_memt, sc->sc_regh, SM502_INTR_MASK, reg); 435 436 return (void *)(uintptr_t)(0x80000000 | bit); 437 } 438 439 void 440 voyager_disestablish_intr(device_t dev, void *ih) 441 { 442 } 443 444 /* timer */ 445 #ifdef VOYAGER_DEBUG 446 static void 447 voyager_print_pwm(struct voyager_softc *sc, int pwmreg) 448 { 449 uint32_t reg; 450 451 reg = bus_space_read_4(sc->sc_memt, sc->sc_regh, pwmreg); 452 aprint_debug_dev(sc->sc_dev, "%08x: %08x = %d Hz, %d high, %d low\n", 453 pwmreg, reg, 454 96000000 / (1 << ((reg & SM502_PWM_CLOCK_DIV_MASK) >> SM502_PWM_CLOCK_DIV_SHIFT)), 455 (reg & SM502_PWM_CLOCK_HIGH_MASK) >> SM502_PWM_CLOCK_HIGH_SHIFT, 456 (reg & SM502_PWM_CLOCK_LOW_MASK) >> SM502_PWM_CLOCK_LOW_SHIFT); 457 } 458 #endif 459 460 uint32_t 461 voyager_set_pwm(int freq, int duty_cycle) 462 { 463 int ifreq, factor, bit, steps; 464 uint32_t reg = 0, hi, lo; 465 466 /* 467 * find the smallest divider that gets us within 4096 steps of the 468 * target frequency 469 */ 470 ifreq = freq * 4096; 471 factor = 96000000 / ifreq; 472 bit = fls32(factor); 473 factor = 1 << bit; 474 steps = 96000000 / (factor * freq); 475 /* can't have it all off */ 476 if (duty_cycle < 1) 477 duty_cycle = 1; 478 /* can't be always on either */ 479 if (duty_cycle > 999) 480 duty_cycle = 999; 481 hi = steps * duty_cycle / 1000; 482 if (hi < 1) 483 hi = 1; 484 lo = steps - hi; 485 if (lo < 1) { 486 hi = steps - 1; 487 lo = 1; 488 } 489 DPRINTF("%d hz -> %d, %d, %d / %d\n", freq, factor, steps, lo, hi); 490 reg = ((hi - 1) & 0xfff) << SM502_PWM_CLOCK_HIGH_SHIFT; 491 reg |= ((lo - 1) & 0xfff) << SM502_PWM_CLOCK_LOW_SHIFT; 492 reg |= (bit & 0xf) << SM502_PWM_CLOCK_DIV_SHIFT; 493 DPRINTF("reg: %08x\n", reg); 494 return reg; 495 } 496