gcscpcib.c revision 1.4
1 /* $NetBSD: gcscpcib.c,v 1.4 2021/04/24 23:36:55 thorpej Exp $ */ 2 /* $OpenBSD: gcscpcib.c,v 1.6 2007/11/17 17:02:47 mbalmer Exp $ */ 3 4 /* 5 * Copyright (c) 2008 Yojiro UO <yuo (at) nui.org> 6 * Copyright (c) 2007 Marc Balmer <mbalmer (at) openbsd.org> 7 * Copyright (c) 2007 Michael Shalayeff 8 * All rights reserved. 9 * 10 * Permission to use, copy, modify, and distribute this software for any 11 * purpose with or without fee is hereby granted, provided that the above 12 * copyright notice and this permission notice appear in all copies. 13 * 14 * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES 15 * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF 16 * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR 17 * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES 18 * WHATSOEVER RESULTING FROM LOSS OF MIND, USE, DATA OR PROFITS, WHETHER IN 19 * AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT 20 * OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE. 21 */ 22 23 /* 24 * AMD CS5535/CS5536 series LPC bridge also containing timer, watchdog and GPIO. 25 */ 26 #include <sys/cdefs.h> 27 __KERNEL_RCSID(0, "$NetBSD: gcscpcib.c,v 1.4 2021/04/24 23:36:55 thorpej Exp $"); 28 29 #include "gpio.h" 30 31 #include <sys/param.h> 32 #include <sys/systm.h> 33 #include <sys/device.h> 34 #include <sys/gpio.h> 35 #include <sys/sysctl.h> 36 #include <sys/timetc.h> 37 #include <sys/wdog.h> 38 39 #include <sys/bus.h> 40 41 #include <dev/gpio/gpiovar.h> 42 43 #include <dev/sysmon/sysmonvar.h> 44 45 #include <dev/ic/gcscpcibreg.h> 46 #include <dev/ic/gcscpcibvar.h> 47 48 /* define if you need to select MFGPT for watchdog manually (0-5). */ 49 /* #define AMD553X_WDT_FORCEUSEMFGPT 0 */ 50 /* select precision of watchdog timer (default value = 0.25sec (4Hz tick) */ 51 #define AMD553X_MFGPT_PRESCALE AMD553X_MFGPT_DIV_8K /* 32K/8K = 4Hz */ 52 53 /* #define GCSCPCIB_DEBUG */ 54 #ifdef GCSCPCIB_DEBUG 55 #define DPRINTF(x) printf x 56 #else 57 #define DPRINTF(x) 58 #endif 59 60 /* 1 bit replace (not support multiple bit)*/ 61 #define AMD553X_MFGPTx_NR_DISABLE(x, bit) \ 62 ( gcsc_wrmsr(AMD553X_MFGPT_NR, gcsc_rdmsr(AMD553X_MFGPT_NR) & ~((bit) << (x))) ) 63 #define AMD553X_MFGPTx_NR_ENABLE(x, bit) \ 64 ( gcsc_wrmsr(AMD553X_MFGPT_NR, gcsc_rdmsr(AMD553X_MFGPT_NR) | ((bit) << (x))) ) 65 66 /* caliculate watchdog timer setting */ 67 #define AMD553X_WDT_TICK (1<<(AMD553X_MFGPT_DIV_32K - AMD553X_MFGPT_PRESCALE)) 68 #define AMD553X_WDT_COUNTMAX (0xffff / AMD553X_WDT_TICK) 69 70 static u_int gcscpcib_get_timecount(struct timecounter *tc); 71 static int gscspcib_scan_mfgpt(struct gcscpcib_softc *sc); 72 static void gscspcib_wdog_update(struct gcscpcib_softc *, uint16_t); 73 static int gcscpcib_wdog_setmode(struct sysmon_wdog *smw); 74 static int gcscpcib_wdog_tickle(struct sysmon_wdog *smw); 75 static void gcscpcib_wdog_enable(struct gcscpcib_softc *sc); 76 static void gcscpcib_wdog_disable(struct gcscpcib_softc *sc); 77 static void gcscpcib_wdog_reset(struct gcscpcib_softc *sc); 78 79 #if NGPIO > 0 80 static int gcscpcib_gpio_pin_read(void *, int); 81 static void gcscpcib_gpio_pin_write(void *, int, int); 82 static void gcscpcib_gpio_pin_ctl(void *, int, int); 83 #endif 84 85 void 86 gcscpcib_attach(device_t self, struct gcscpcib_softc *sc, 87 bus_space_tag_t iot, int flags) 88 { 89 struct timecounter *tc = &sc->sc_timecounter; 90 bus_addr_t wdtbase; 91 int wdt = 0, gpio = 0; 92 #if NGPIO > 0 93 struct gpiobus_attach_args gba; 94 bus_addr_t gpiobase; 95 int i; 96 #endif 97 98 sc->sc_iot = iot; 99 #if NGPIO > 0 100 sc->sc_gpio_iot = iot; 101 #endif 102 103 /* Attach the CS553[56] timer */ 104 tc->tc_get_timecount = gcscpcib_get_timecount; 105 tc->tc_counter_mask = 0xffffffff; 106 tc->tc_frequency = 3579545; 107 tc->tc_name = device_xname(self); 108 tc->tc_quality = 1000; 109 tc->tc_priv = sc; 110 tc_init(tc); 111 112 if (flags & GCSCATTACH_NO_WDT) 113 goto gpio; 114 115 /* Attach the watchdog timer */ 116 wdtbase = gcsc_rdmsr(MSR_LBAR_MFGPT) & 0xffff; 117 if (bus_space_map(sc->sc_iot, wdtbase, 64, 0, &sc->sc_ioh)) { 118 aprint_error_dev(self, "can't map memory space for WDT\n"); 119 } else { 120 /* select a MFGPT timer for watchdog counter */ 121 if (!gscspcib_scan_mfgpt(sc)) { 122 aprint_error_dev(self, "can't alloc an MFGPT for WDT\n"); 123 goto gpio; 124 } 125 /* 126 * Note: MFGPGx_SETUP register is write once register 127 * except CNT_EN and CMP[12]EV bit. 128 */ 129 bus_space_write_2(sc->sc_iot, sc->sc_ioh, 130 AMD553X_MFGPTX_SETUP(sc->sc_wdt_mfgpt), 131 AMD553X_MFGPT_CMP2EV | AMD553X_MFGPT_CMP2 | 132 AMD553X_MFGPT_PRESCALE); 133 134 /* disable watchdog action */ 135 AMD553X_MFGPTx_NR_DISABLE(sc->sc_wdt_mfgpt, 136 AMD553X_MFGPT0_C2_NMIM); 137 AMD553X_MFGPTx_NR_DISABLE(sc->sc_wdt_mfgpt, 138 AMD553X_MFGPT0_C2_RSTEN); 139 140 sc->sc_smw.smw_name = device_xname(self); 141 sc->sc_smw.smw_cookie = sc; 142 sc->sc_smw.smw_setmode = gcscpcib_wdog_setmode; 143 sc->sc_smw.smw_tickle = gcscpcib_wdog_tickle; 144 sc->sc_smw.smw_period = 32; 145 aprint_normal_dev(self, "Watchdog Timer via MFGPT%d", 146 sc->sc_wdt_mfgpt); 147 wdt = 1; 148 } 149 150 gpio: 151 #if NGPIO > 0 152 /* map GPIO I/O space */ 153 gpiobase = gcsc_rdmsr(MSR_LBAR_GPIO) & 0xffff; 154 if (!bus_space_map(sc->sc_gpio_iot, gpiobase, 0xff, 0, 155 &sc->sc_gpio_ioh)) { 156 if (wdt) 157 aprint_normal(", GPIO"); 158 else 159 aprint_normal_dev(self, "GPIO"); 160 161 /* initialize pin array */ 162 for (i = 0; i < AMD553X_GPIO_NPINS; i++) { 163 sc->sc_gpio_pins[i].pin_num = i; 164 sc->sc_gpio_pins[i].pin_caps = GPIO_PIN_INPUT | 165 GPIO_PIN_OUTPUT | GPIO_PIN_OPENDRAIN | 166 GPIO_PIN_PUSHPULL | GPIO_PIN_TRISTATE | 167 GPIO_PIN_PULLUP | GPIO_PIN_PULLDOWN | 168 GPIO_PIN_INVIN | GPIO_PIN_INVOUT; 169 170 /* read initial state */ 171 sc->sc_gpio_pins[i].pin_state = 172 gcscpcib_gpio_pin_read(sc, i); 173 } 174 175 /* create controller tag */ 176 sc->sc_gpio_gc.gp_cookie = sc; 177 sc->sc_gpio_gc.gp_pin_read = gcscpcib_gpio_pin_read; 178 sc->sc_gpio_gc.gp_pin_write = gcscpcib_gpio_pin_write; 179 sc->sc_gpio_gc.gp_pin_ctl = gcscpcib_gpio_pin_ctl; 180 181 gba.gba_gc = &sc->sc_gpio_gc; 182 gba.gba_pins = sc->sc_gpio_pins; 183 gba.gba_npins = AMD553X_GPIO_NPINS; 184 gpio = 1; 185 } 186 #endif 187 if (wdt || gpio) 188 aprint_normal("\n"); 189 190 #if NGPIO > 0 191 /* Attach GPIO framework */ 192 if (gpio) 193 config_found(self, &gba, gpiobus_print, 194 CFARG_IATTR, "gpiobus", 195 CFARG_EOL); 196 #endif 197 198 /* Register Watchdog timer to SMW */ 199 if (wdt) { 200 if (sysmon_wdog_register(&sc->sc_smw) != 0) 201 aprint_error_dev(self, 202 "cannot register wdog with sysmon\n"); 203 } 204 } 205 206 static u_int 207 gcscpcib_get_timecount(struct timecounter *tc) 208 { 209 return gcsc_rdmsr(AMD553X_TMC); 210 } 211 212 /* Watchdog timer support functions */ 213 static int 214 gscspcib_scan_mfgpt(struct gcscpcib_softc *sc) 215 { 216 int i; 217 218 #ifdef AMD553X_WDT_FORCEUSEMFGPT 219 if (AMD553X_WDT_FORCEUSEMFGPT >= AMD553X_MFGPT_MAX) 220 return 0; 221 sc->sc_wdt_mfgpt = AMD553X_WDT_FORCEUSEMFGPT; 222 return 1; 223 #endif /* AMD553X_WDT_FORCEUSEMFGPT */ 224 225 for (i = 0; i < AMD553X_MFGPT_MAX; i++){ 226 if (bus_space_read_2(sc->sc_iot, sc->sc_ioh, 227 AMD553X_MFGPTX_SETUP(i)) == 0) { 228 /* found unused MFGPT, use it. */ 229 sc->sc_wdt_mfgpt = i; 230 return 1; 231 } 232 } 233 /* no MFGPT for WDT found */ 234 return 0; 235 } 236 237 238 static void 239 gscspcib_wdog_update(struct gcscpcib_softc *sc, uint16_t count) 240 { 241 #ifdef GCSCPCIB_DEBUG 242 uint16_t cnt; 243 cnt = bus_space_read_2(sc->sc_iot, sc->sc_ioh, 244 AMD553X_MFGPTX_CNT(sc->sc_wdt_mfgpt)); 245 #endif 246 if (count > AMD553X_WDT_COUNTMAX) 247 count = AMD553X_WDT_COUNTMAX; 248 /* 249 * CS553X databook recommend following sequence to re-initialize 250 * the counter and compare value. (See p165 on CS5536 databook) 251 * 1: suspend counter: clear counter enable bit to 0 252 * 2: reset (and NMI, if need) enable bit in MSRs 253 * 3: update counter & clear event flags 254 * 4: resume (2) operation 255 * 5: re-enable counter 256 */ 257 bus_space_write_2(sc->sc_iot, sc->sc_ioh, 258 AMD553X_MFGPTX_SETUP(sc->sc_wdt_mfgpt), 0); 259 AMD553X_MFGPTx_NR_DISABLE(sc->sc_wdt_mfgpt, AMD553X_MFGPT0_C2_RSTEN); 260 bus_space_write_2(sc->sc_iot, sc->sc_ioh, 261 AMD553X_MFGPTX_CNT(sc->sc_wdt_mfgpt), count); 262 bus_space_write_2(sc->sc_iot, sc->sc_ioh, 263 AMD553X_MFGPTX_SETUP(sc->sc_wdt_mfgpt), 264 AMD553X_MFGPT_CMP1 | AMD553X_MFGPT_CMP2); 265 AMD553X_MFGPTx_NR_ENABLE(sc->sc_wdt_mfgpt, AMD553X_MFGPT0_C2_RSTEN); 266 bus_space_write_2(sc->sc_iot, sc->sc_ioh, 267 AMD553X_MFGPTX_SETUP(sc->sc_wdt_mfgpt), 268 AMD553X_MFGPT_CNT_EN | AMD553X_MFGPT_CMP2); 269 270 DPRINTF(("%s: MFGPT%d_CNT= %d -> %d (expect: %d), MFGPT_NR=%#.8x\n", 271 __func__, sc->sc_wdt_mfgpt, cnt, 272 bus_space_read_2(sc->sc_iot, sc->sc_ioh, 273 AMD553X_MFGPTX_CNT(sc->sc_wdt_mfgpt)), count, 274 (uint32_t)(gcsc_rdmsr(AMD553X_MFGPT_NR)))); 275 } 276 277 static void 278 gcscpcib_wdog_disable(struct gcscpcib_softc *sc) 279 { 280 /* 281 * stop counter and reset counter value 282 * Note: as the MFGPTx_SETUP is write once register, the prescaler 283 * setting, clock select and compare mode are kept till reset. 284 */ 285 gscspcib_wdog_update(sc, 0); 286 bus_space_write_2(sc->sc_iot, sc->sc_ioh, 287 AMD553X_MFGPTX_SETUP(sc->sc_wdt_mfgpt), 0); 288 289 /* disable watchdog action */ 290 DPRINTF(("%s: disable watchdog action\n", __func__)); 291 AMD553X_MFGPTx_NR_DISABLE(sc->sc_wdt_mfgpt, AMD553X_MFGPT0_C2_RSTEN); 292 } 293 294 static void 295 gcscpcib_wdog_enable(struct gcscpcib_softc *sc) 296 { 297 int period = sc->sc_smw.smw_period; 298 299 /* clear recent event flag and counter value, and start counter */ 300 gcscpcib_wdog_reset(sc); 301 /* set watchdog timer limit, counter tick is 0.5sec */ 302 bus_space_write_2(sc->sc_iot, sc->sc_ioh, 303 AMD553X_MFGPTX_CMP2(sc->sc_wdt_mfgpt), 304 period * AMD553X_WDT_TICK); 305 306 /* enable watchdog action */ 307 DPRINTF(("%s: enable watchdog action. (MFGPT0_CMP2= %d)", __func__, 308 bus_space_read_2(sc->sc_iot, sc->sc_ioh, 309 AMD553X_MFGPTX_CMP2(sc->sc_wdt_mfgpt)))); 310 AMD553X_MFGPTx_NR_ENABLE(sc->sc_wdt_mfgpt, AMD553X_MFGPT0_C2_RSTEN); 311 DPRINTF((" AMD553X_MFGPT_NR 0x%" PRIx64 "\n", gcsc_rdmsr(AMD553X_MFGPT_NR))); 312 } 313 314 static int 315 gcscpcib_wdog_setmode(struct sysmon_wdog *smw) 316 { 317 struct gcscpcib_softc *sc = smw->smw_cookie; 318 319 if ((smw->smw_mode & WDOG_MODE_MASK) == WDOG_MODE_DISARMED) { 320 gcscpcib_wdog_disable(sc); 321 return 0; 322 } 323 324 if (smw->smw_period == WDOG_PERIOD_DEFAULT) 325 smw->smw_period = 32; 326 else if (smw->smw_period > AMD553X_WDT_COUNTMAX) /* too big */ 327 return EINVAL; 328 329 gcscpcib_wdog_enable(sc); 330 331 return 0; 332 } 333 334 static void 335 gcscpcib_wdog_reset(struct gcscpcib_softc *sc) 336 { 337 /* reset counter value */ 338 gscspcib_wdog_update(sc, 0); 339 /* start counter & clear recent event of CMP2 */ 340 bus_space_write_2(sc->sc_iot, sc->sc_ioh, 341 AMD553X_MFGPTX_SETUP(sc->sc_wdt_mfgpt), 342 AMD553X_MFGPT_CNT_EN | AMD553X_MFGPT_CMP2); 343 } 344 345 static int 346 gcscpcib_wdog_tickle(struct sysmon_wdog *smw) 347 { 348 struct gcscpcib_softc *sc = smw->smw_cookie; 349 350 DPRINTF(("%s: update watchdog timer\n", __func__)); 351 gcscpcib_wdog_reset(sc); 352 return 0; 353 } 354 355 #if NGPIO > 0 356 /* GPIO support functions */ 357 static int 358 gcscpcib_gpio_pin_read(void *arg, int pin) 359 { 360 struct gcscpcib_softc *sc = arg; 361 uint32_t data; 362 int reg; 363 364 reg = AMD553X_GPIO_OUT_VAL; 365 if (pin > 15) { 366 pin &= 0x0f; 367 reg += AMD553X_GPIOH_OFFSET; 368 } 369 data = bus_space_read_4(sc->sc_gpio_iot, sc->sc_gpio_ioh, reg); 370 371 return data & 1 << pin ? GPIO_PIN_HIGH : GPIO_PIN_LOW; 372 } 373 374 static void 375 gcscpcib_gpio_pin_write(void *arg, int pin, int value) 376 { 377 struct gcscpcib_softc *sc = arg; 378 uint32_t data; 379 int reg; 380 381 reg = AMD553X_GPIO_OUT_VAL; 382 if (pin > 15) { 383 pin &= 0x0f; 384 reg += AMD553X_GPIOH_OFFSET; 385 } 386 if (value == 1) 387 data = 1 << pin; 388 else 389 data = 1 << (pin + 16); 390 391 bus_space_write_4(sc->sc_gpio_iot, sc->sc_gpio_ioh, reg, data); 392 } 393 394 static void 395 gcscpcib_gpio_pin_ctl(void *arg, int pin, int flags) 396 { 397 struct gcscpcib_softc *sc = arg; 398 int n, reg[7], val[7], nreg = 0, off = 0; 399 400 if (pin > 15) { 401 pin &= 0x0f; 402 off = AMD553X_GPIOH_OFFSET; 403 } 404 405 reg[nreg] = AMD553X_GPIO_IN_EN + off; 406 if (flags & GPIO_PIN_INPUT) 407 val[nreg++] = 1 << pin; 408 else 409 val[nreg++] = 1 << (pin + 16); 410 411 reg[nreg] = AMD553X_GPIO_OUT_EN + off; 412 if (flags & GPIO_PIN_OUTPUT) 413 val[nreg++] = 1 << pin; 414 else 415 val[nreg++] = 1 << (pin + 16); 416 417 reg[nreg] = AMD553X_GPIO_OD_EN + off; 418 if (flags & GPIO_PIN_OPENDRAIN) 419 val[nreg++] = 1 << pin; 420 else 421 val[nreg++] = 1 << (pin + 16); 422 423 reg[nreg] = AMD553X_GPIO_PU_EN + off; 424 if (flags & GPIO_PIN_PULLUP) 425 val[nreg++] = 1 << pin; 426 else 427 val[nreg++] = 1 << (pin + 16); 428 429 reg[nreg] = AMD553X_GPIO_PD_EN + off; 430 if (flags & GPIO_PIN_PULLDOWN) 431 val[nreg++] = 1 << pin; 432 else 433 val[nreg++] = 1 << (pin + 16); 434 435 reg[nreg] = AMD553X_GPIO_IN_INVRT_EN + off; 436 if (flags & GPIO_PIN_INVIN) 437 val[nreg++] = 1 << pin; 438 else 439 val[nreg++] = 1 << (pin + 16); 440 441 reg[nreg] = AMD553X_GPIO_OUT_INVRT_EN + off; 442 if (flags & GPIO_PIN_INVOUT) 443 val[nreg++] = 1 << pin; 444 else 445 val[nreg++] = 1 << (pin + 16); 446 447 /* set flags */ 448 for (n = 0; n < nreg; n++) 449 bus_space_write_4(sc->sc_gpio_iot, sc->sc_gpio_ioh, reg[n], 450 val[n]); 451 } 452 #endif /* NGPIO > 0 */ 453 454
Indexes created Thu Oct 02 10:09:58 GMT 2025