twl_clks.c revision 257200
1/*- 2 * Copyright (c) 2012 3 * Ben Gray <bgray@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 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 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: head/sys/arm/ti/twl/twl_clks.c 257200 2013-10-27 01:34:10Z ian $"); 30 31/* 32 * Texas Instruments TWL4030/TWL5030/TWL60x0/TPS659x0 Power Management. 33 * 34 * This driver covers the external clocks, allows for enabling & 35 * disabling their output. 36 * 37 * 38 * 39 * FLATTENED DEVICE TREE (FDT) 40 * Startup override settings can be specified in the FDT, if they are they 41 * should be under the twl parent device and take the following form: 42 * 43 * external-clocks = "name1", "state1", 44 * "name2", "state2", 45 * etc; 46 * 47 * Each override should be a pair, the first entry is the name of the clock 48 * the second is the state to set, possible strings are either "on" or "off". 49 * 50 */ 51 52#include <sys/param.h> 53#include <sys/systm.h> 54#include <sys/kernel.h> 55#include <sys/lock.h> 56#include <sys/module.h> 57#include <sys/bus.h> 58#include <sys/resource.h> 59#include <sys/rman.h> 60#include <sys/sysctl.h> 61#include <sys/sx.h> 62#include <sys/malloc.h> 63 64#include <machine/bus.h> 65#include <machine/cpu.h> 66#include <machine/cpufunc.h> 67#include <machine/resource.h> 68#include <machine/intr.h> 69 70#include <dev/ofw/openfirm.h> 71#include <dev/ofw/ofw_bus.h> 72 73#include "twl.h" 74#include "twl_clks.h" 75 76 77static int twl_clks_debug = 1; 78 79 80/* 81 * Power Groups bits for the 4030 and 6030 devices 82 */ 83#define TWL4030_P3_GRP 0x80 /* Peripherals, power group */ 84#define TWL4030_P2_GRP 0x40 /* Modem power group */ 85#define TWL4030_P1_GRP 0x20 /* Application power group (FreeBSD control) */ 86 87#define TWL6030_P3_GRP 0x04 /* Modem power group */ 88#define TWL6030_P2_GRP 0x02 /* Connectivity power group */ 89#define TWL6030_P1_GRP 0x01 /* Application power group (FreeBSD control) */ 90 91/* 92 * Register offsets within a clk regulator register set 93 */ 94#define TWL_CLKS_GRP 0x00 /* Regulator GRP register */ 95#define TWL_CLKS_STATE 0x02 /* TWL6030 only */ 96 97 98 99/** 100 * Support voltage regulators for the different IC's 101 */ 102struct twl_clock { 103 const char *name; 104 uint8_t subdev; 105 uint8_t regbase; 106}; 107 108static const struct twl_clock twl4030_clocks[] = { 109 { "32kclkout", 0, 0x8e }, 110 { NULL, 0, 0x00 } 111}; 112 113static const struct twl_clock twl6030_clocks[] = { 114 { "clk32kg", 0, 0xbc }, 115 { "clk32kao", 0, 0xb9 }, 116 { "clk32kaudio", 0, 0xbf }, 117 { NULL, 0, 0x00 } 118}; 119 120#define TWL_CLKS_MAX_NAMELEN 32 121 122struct twl_clk_entry { 123 LIST_ENTRY(twl_clk_entry) link; 124 struct sysctl_oid *oid; 125 char name[TWL_CLKS_MAX_NAMELEN]; 126 uint8_t sub_dev; /* the sub-device number for the clock */ 127 uint8_t reg_off; /* register base address of the clock */ 128}; 129 130struct twl_clks_softc { 131 device_t sc_dev; /* twl_clk device */ 132 device_t sc_pdev; /* parent device (twl) */ 133 struct sx sc_sx; /* internal locking */ 134 struct intr_config_hook sc_init_hook; 135 LIST_HEAD(twl_clk_list, twl_clk_entry) sc_clks_list; 136}; 137 138/** 139 * Macros for driver shared locking 140 */ 141#define TWL_CLKS_XLOCK(_sc) sx_xlock(&(_sc)->sc_sx) 142#define TWL_CLKS_XUNLOCK(_sc) sx_xunlock(&(_sc)->sc_sx) 143#define TWL_CLKS_SLOCK(_sc) sx_slock(&(_sc)->sc_sx) 144#define TWL_CLKS_SUNLOCK(_sc) sx_sunlock(&(_sc)->sc_sx) 145#define TWL_CLKS_LOCK_INIT(_sc) sx_init(&(_sc)->sc_sx, "twl_clks") 146#define TWL_CLKS_LOCK_DESTROY(_sc) sx_destroy(&(_sc)->sc_sx); 147 148#define TWL_CLKS_ASSERT_LOCKED(_sc) sx_assert(&(_sc)->sc_sx, SA_LOCKED); 149 150#define TWL_CLKS_LOCK_UPGRADE(_sc) \ 151 do { \ 152 while (!sx_try_upgrade(&(_sc)->sc_sx)) \ 153 pause("twl_clks_ex", (hz / 100)); \ 154 } while(0) 155#define TWL_CLKS_LOCK_DOWNGRADE(_sc) sx_downgrade(&(_sc)->sc_sx); 156 157 158 159 160/** 161 * twl_clks_read_1 - read single register from the TWL device 162 * twl_clks_write_1 - writes a single register in the TWL device 163 * @sc: device context 164 * @clk: the clock device we're reading from / writing to 165 * @off: offset within the clock's register set 166 * @val: the value to write or a pointer to a variable to store the result 167 * 168 * RETURNS: 169 * Zero on success or an error code on failure. 170 */ 171static inline int 172twl_clks_read_1(struct twl_clks_softc *sc, struct twl_clk_entry *clk, 173 uint8_t off, uint8_t *val) 174{ 175 return (twl_read(sc->sc_pdev, clk->sub_dev, clk->reg_off + off, val, 1)); 176} 177 178static inline int 179twl_clks_write_1(struct twl_clks_softc *sc, struct twl_clk_entry *clk, 180 uint8_t off, uint8_t val) 181{ 182 return (twl_write(sc->sc_pdev, clk->sub_dev, clk->reg_off + off, &val, 1)); 183} 184 185 186/** 187 * twl_clks_is_enabled - determines if a clock is enabled 188 * @dev: TWL CLK device 189 * @name: the name of the clock 190 * @enabled: upon return will contain the 'enabled' state 191 * 192 * LOCKING: 193 * Internally the function takes and releases the TWL lock. 194 * 195 * RETURNS: 196 * Zero on success or a negative error code on failure. 197 */ 198int 199twl_clks_is_enabled(device_t dev, const char *name, int *enabled) 200{ 201 struct twl_clks_softc *sc = device_get_softc(dev); 202 struct twl_clk_entry *clk; 203 int found = 0; 204 int err; 205 uint8_t grp, state; 206 207 TWL_CLKS_SLOCK(sc); 208 209 LIST_FOREACH(clk, &sc->sc_clks_list, link) { 210 if (strcmp(clk->name, name) == 0) { 211 found = 1; 212 break; 213 } 214 } 215 216 if (!found) { 217 TWL_CLKS_SUNLOCK(sc); 218 return (EINVAL); 219 } 220 221 222 if (twl_is_4030(sc->sc_pdev)) { 223 224 err = twl_clks_read_1(sc, clk, TWL_CLKS_GRP, &grp); 225 if (!err) 226 *enabled = (grp & TWL4030_P1_GRP); 227 228 } else if (twl_is_6030(sc->sc_pdev) || twl_is_6025(sc->sc_pdev)) { 229 230 TWL_CLKS_LOCK_UPGRADE(sc); 231 232 /* Check the clock is in the application group */ 233 if (twl_is_6030(sc->sc_pdev)) { 234 err = twl_clks_read_1(sc, clk, TWL_CLKS_GRP, &grp); 235 if (err) { 236 TWL_CLKS_LOCK_DOWNGRADE(sc); 237 goto done; 238 } 239 240 if (!(grp & TWL6030_P1_GRP)) { 241 TWL_CLKS_LOCK_DOWNGRADE(sc); 242 *enabled = 0; /* disabled */ 243 goto done; 244 } 245 } 246 247 /* Read the application mode state and verify it's ON */ 248 err = twl_clks_read_1(sc, clk, TWL_CLKS_STATE, &state); 249 if (!err) 250 *enabled = ((state & 0x0C) == 0x04); 251 252 TWL_CLKS_LOCK_DOWNGRADE(sc); 253 254 } else { 255 err = EINVAL; 256 } 257 258done: 259 TWL_CLKS_SUNLOCK(sc); 260 return (err); 261} 262 263 264/** 265 * twl_clks_set_state - enables/disables a clock output 266 * @sc: device context 267 * @clk: the clock entry to enable/disable 268 * @enable: non-zero the clock is enabled, zero the clock is disabled 269 * 270 * LOCKING: 271 * The TWL CLK lock must be held before this function is called. 272 * 273 * RETURNS: 274 * Zero on success or an error code on failure. 275 */ 276static int 277twl_clks_set_state(struct twl_clks_softc *sc, struct twl_clk_entry *clk, 278 int enable) 279{ 280 int xlocked; 281 int err; 282 uint8_t grp; 283 284 TWL_CLKS_ASSERT_LOCKED(sc); 285 286 /* Upgrade the lock to exclusive because about to perform read-mod-write */ 287 xlocked = sx_xlocked(&sc->sc_sx); 288 if (!xlocked) 289 TWL_CLKS_LOCK_UPGRADE(sc); 290 291 err = twl_clks_read_1(sc, clk, TWL_CLKS_GRP, &grp); 292 if (err) 293 goto done; 294 295 if (twl_is_4030(sc->sc_pdev)) { 296 297 /* On the TWL4030 we just need to ensure the clock is in the right 298 * power domain, don't need to turn on explicitly like TWL6030. 299 */ 300 if (enable) 301 grp |= TWL4030_P1_GRP; 302 else 303 grp &= ~(TWL4030_P1_GRP | TWL4030_P2_GRP | TWL4030_P3_GRP); 304 305 err = twl_clks_write_1(sc, clk, TWL_CLKS_GRP, grp); 306 307 } else if (twl_is_6030(sc->sc_pdev) || twl_is_6025(sc->sc_pdev)) { 308 309 /* Make sure the clock belongs to at least the APP power group */ 310 if (twl_is_6030(sc->sc_pdev) && !(grp & TWL6030_P1_GRP)) { 311 grp |= TWL6030_P1_GRP; 312 err = twl_clks_write_1(sc, clk, TWL_CLKS_GRP, grp); 313 if (err) 314 goto done; 315 } 316 317 /* On TWL6030 we need to make sure we disable power for all groups */ 318 if (twl_is_6030(sc->sc_pdev)) 319 grp = TWL6030_P1_GRP | TWL6030_P2_GRP | TWL6030_P3_GRP; 320 else 321 grp = 0x00; 322 323 /* Set the state of the clock */ 324 if (enable) 325 err = twl_clks_write_1(sc, clk, TWL_CLKS_STATE, (grp << 5) | 0x01); 326 else 327 err = twl_clks_write_1(sc, clk, TWL_CLKS_STATE, (grp << 5)); 328 329 } else { 330 331 err = EINVAL; 332 } 333 334done: 335 if (!xlocked) 336 TWL_CLKS_LOCK_DOWNGRADE(sc); 337 338 if ((twl_clks_debug > 1) && !err) 339 device_printf(sc->sc_dev, "%s : %sabled\n", clk->name, 340 enable ? "en" : "dis"); 341 342 return (err); 343} 344 345 346/** 347 * twl_clks_disable - disables a clock output 348 * @dev: TWL clk device 349* @name: the name of the clock 350 * 351 * LOCKING: 352 * Internally the function takes and releases the TWL lock. 353 * 354 * RETURNS: 355* Zero on success or an error code on failure. 356 */ 357int 358twl_clks_disable(device_t dev, const char *name) 359{ 360 struct twl_clks_softc *sc = device_get_softc(dev); 361 struct twl_clk_entry *clk; 362 int err = EINVAL; 363 364 TWL_CLKS_SLOCK(sc); 365 366 LIST_FOREACH(clk, &sc->sc_clks_list, link) { 367 if (strcmp(clk->name, name) == 0) { 368 err = twl_clks_set_state(sc, clk, 0); 369 break; 370 } 371 } 372 373 TWL_CLKS_SUNLOCK(sc); 374 return (err); 375} 376 377/** 378 * twl_clks_enable - enables a clock output 379 * @dev: TWL clk device 380 * @name: the name of the clock 381 * 382 * LOCKING: 383 * Internally the function takes and releases the TWL CLKS lock. 384 * 385 * RETURNS: 386 * Zero on success or an error code on failure. 387 */ 388int 389twl_clks_enable(device_t dev, const char *name) 390{ 391 struct twl_clks_softc *sc = device_get_softc(dev); 392 struct twl_clk_entry *clk; 393 int err = EINVAL; 394 395 TWL_CLKS_SLOCK(sc); 396 397 LIST_FOREACH(clk, &sc->sc_clks_list, link) { 398 if (strcmp(clk->name, name) == 0) { 399 err = twl_clks_set_state(sc, clk, 1); 400 break; 401 } 402 } 403 404 TWL_CLKS_SUNLOCK(sc); 405 return (err); 406} 407 408/** 409 * twl_clks_sysctl_clock - reads the state of the clock 410 * @SYSCTL_HANDLER_ARGS: arguments for the callback 411 * 412 * Returns the clock status; disabled is zero and enabled is non-zero. 413 * 414 * LOCKING: 415 * It's expected the TWL lock is held while this function is called. 416 * 417 * RETURNS: 418 * EIO if device is not present, otherwise 0 is returned. 419 */ 420static int 421twl_clks_sysctl_clock(SYSCTL_HANDLER_ARGS) 422{ 423 struct twl_clks_softc *sc = (struct twl_clks_softc*)arg1; 424 int err; 425 int enabled = 0; 426 427 if ((err = twl_clks_is_enabled(sc->sc_dev, oidp->oid_name, &enabled)) != 0) 428 return err; 429 430 return sysctl_handle_int(oidp, &enabled, 0, req); 431} 432 433/** 434 * twl_clks_add_clock - adds single clock sysctls for the device 435 * @sc: device soft context 436 * @name: the name of the regulator 437 * @nsub: the number of the subdevice 438 * @regbase: the base address of the clocks registers 439 * 440 * Adds a single clock to the device and also a sysctl interface for 441 * querying it's status. 442 * 443 * LOCKING: 444 * It's expected the exclusive lock is held while this function is called. 445 * 446 * RETURNS: 447 * Pointer to the new clock entry on success, otherwise NULL on failure. 448 */ 449static struct twl_clk_entry* 450twl_clks_add_clock(struct twl_clks_softc *sc, const char *name, 451 uint8_t nsub, uint8_t regbase) 452{ 453 struct sysctl_ctx_list *ctx = device_get_sysctl_ctx(sc->sc_dev); 454 struct sysctl_oid *tree = device_get_sysctl_tree(sc->sc_dev); 455 struct twl_clk_entry *new; 456 457 TWL_CLKS_ASSERT_LOCKED(sc); 458 459 new = malloc(sizeof(struct twl_clk_entry), M_DEVBUF, M_NOWAIT | M_ZERO); 460 if (new == NULL) 461 return (NULL); 462 463 464 strncpy(new->name, name, TWL_CLKS_MAX_NAMELEN); 465 new->name[TWL_CLKS_MAX_NAMELEN - 1] = '\0'; 466 467 new->sub_dev = nsub; 468 new->reg_off = regbase; 469 470 471 472 /* Add a sysctl entry for the clock */ 473 new->oid = SYSCTL_ADD_PROC(ctx, SYSCTL_CHILDREN(tree), OID_AUTO, name, 474 CTLTYPE_INT | CTLFLAG_RD, sc, 0, 475 twl_clks_sysctl_clock, "I", "external clock"); 476 477 /* Finally add the regulator to list of supported regulators */ 478 LIST_INSERT_HEAD(&sc->sc_clks_list, new, link); 479 480 return (new); 481} 482 483/** 484 * twl_clks_add_clocks - populates the internal list of clocks 485 * @sc: device soft context 486 * @chip: the name of the chip used in the hints 487 * @clks the list of clocks supported by the device 488 * 489 * Loops over the list of clocks and adds them to the device context. Also 490 * scans the FDT to determine if there are any clocks that should be 491 * enabled/disabled automatically. 492 * 493 * LOCKING: 494 * Internally takes the exclusive lock while adding the clocks to the 495 * device context. 496 * 497 * RETURNS: 498 * Always returns 0. 499 */ 500static int 501twl_clks_add_clocks(struct twl_clks_softc *sc, const struct twl_clock *clks) 502{ 503 int err; 504 const struct twl_clock *walker; 505 struct twl_clk_entry *entry; 506 phandle_t child; 507 char rnames[256]; 508 char *name, *state; 509 int len = 0, prop_len; 510 int enable; 511 512 513 TWL_CLKS_XLOCK(sc); 514 515 /* Add the regulators from the list */ 516 walker = &clks[0]; 517 while (walker->name != NULL) { 518 519 /* Add the regulator to the list */ 520 entry = twl_clks_add_clock(sc, walker->name, walker->subdev, 521 walker->regbase); 522 if (entry == NULL) 523 continue; 524 525 walker++; 526 } 527 528 /* Check for any FDT settings that need to be applied */ 529 child = ofw_bus_get_node(sc->sc_pdev); 530 if (child) { 531 532 prop_len = OF_getprop(child, "external-clocks", rnames, sizeof(rnames)); 533 while (len < prop_len) { 534 name = rnames + len; 535 len += strlen(name) + 1; 536 if ((len >= prop_len) || (name[0] == '\0')) 537 break; 538 539 state = rnames + len; 540 len += strlen(state) + 1; 541 if (state[0] == '\0') 542 break; 543 544 enable = !strncmp(state, "on", 2); 545 546 LIST_FOREACH(entry, &sc->sc_clks_list, link) { 547 if (strcmp(entry->name, name) == 0) { 548 twl_clks_set_state(sc, entry, enable); 549 break; 550 } 551 } 552 } 553 } 554 555 TWL_CLKS_XUNLOCK(sc); 556 557 558 if (twl_clks_debug) { 559 LIST_FOREACH(entry, &sc->sc_clks_list, link) { 560 err = twl_clks_is_enabled(sc->sc_dev, entry->name, &enable); 561 if (!err) 562 device_printf(sc->sc_dev, "%s : %s\n", entry->name, 563 enable ? "on" : "off"); 564 } 565 } 566 567 return (0); 568} 569 570/** 571 * twl_clks_init - initialises the list of clocks 572 * @dev: the twl_clks device 573 * 574 * This function is called as an intrhook once interrupts have been enabled, 575 * this is done so that the driver has the option to enable/disable a clock 576 * based on settings providied in the FDT. 577 * 578 * LOCKING: 579 * May takes the exclusive lock in the function. 580 */ 581static void 582twl_clks_init(void *dev) 583{ 584 struct twl_clks_softc *sc; 585 586 sc = device_get_softc((device_t)dev); 587 588 if (twl_is_4030(sc->sc_pdev)) 589 twl_clks_add_clocks(sc, twl4030_clocks); 590 else if (twl_is_6030(sc->sc_pdev) || twl_is_6025(sc->sc_pdev)) 591 twl_clks_add_clocks(sc, twl6030_clocks); 592 593 config_intrhook_disestablish(&sc->sc_init_hook); 594} 595 596static int 597twl_clks_probe(device_t dev) 598{ 599 if (twl_is_4030(device_get_parent(dev))) 600 device_set_desc(dev, "TI TWL4030 PMIC External Clocks"); 601 else if (twl_is_6025(device_get_parent(dev)) || 602 twl_is_6030(device_get_parent(dev))) 603 device_set_desc(dev, "TI TWL6025/TWL6030 PMIC External Clocks"); 604 else 605 return (ENXIO); 606 607 return (0); 608} 609 610static int 611twl_clks_attach(device_t dev) 612{ 613 struct twl_clks_softc *sc; 614 615 sc = device_get_softc(dev); 616 sc->sc_dev = dev; 617 sc->sc_pdev = device_get_parent(dev); 618 619 TWL_CLKS_LOCK_INIT(sc); 620 621 LIST_INIT(&sc->sc_clks_list); 622 623 624 sc->sc_init_hook.ich_func = twl_clks_init; 625 sc->sc_init_hook.ich_arg = dev; 626 627 if (config_intrhook_establish(&sc->sc_init_hook) != 0) 628 return (ENOMEM); 629 630 return (0); 631} 632 633static int 634twl_clks_detach(device_t dev) 635{ 636 struct twl_clks_softc *sc; 637 struct twl_clk_entry *clk; 638 struct twl_clk_entry *tmp; 639 640 sc = device_get_softc(dev); 641 642 TWL_CLKS_XLOCK(sc); 643 644 LIST_FOREACH_SAFE(clk, &sc->sc_clks_list, link, tmp) { 645 LIST_REMOVE(clk, link); 646 sysctl_remove_oid(clk->oid, 1, 0); 647 free(clk, M_DEVBUF); 648 } 649 650 TWL_CLKS_XUNLOCK(sc); 651 652 TWL_CLKS_LOCK_DESTROY(sc); 653 654 return (0); 655} 656 657static device_method_t twl_clks_methods[] = { 658 DEVMETHOD(device_probe, twl_clks_probe), 659 DEVMETHOD(device_attach, twl_clks_attach), 660 DEVMETHOD(device_detach, twl_clks_detach), 661 662 {0, 0}, 663}; 664 665static driver_t twl_clks_driver = { 666 "twl_clks", 667 twl_clks_methods, 668 sizeof(struct twl_clks_softc), 669}; 670 671static devclass_t twl_clks_devclass; 672 673DRIVER_MODULE(twl_clks, twl, twl_clks_driver, twl_clks_devclass, 0, 0); 674MODULE_VERSION(twl_clks, 1); 675