1 /*- 2 * SPDX-License-Identifier: BSD-2-Clause-FreeBSD 3 * 4 * Copyright (c) 2011 5 * Ben Gray <ben.r.gray@gmail.com>. 6 * All rights reserved. 7 * 8 * Redistribution and use in source and binary forms, with or without 9 * modification, are permitted provided that the following conditions 10 * are met: 11 * 1. Redistributions of source code must retain the above copyright 12 * notice, this list of conditions and the following disclaimer. 13 * 2. Redistributions in binary form must reproduce the above copyright 14 * notice, this list of conditions and the following disclaimer in the 15 * documentation and/or other materials provided with the distribution. 16 * 17 * THIS SOFTWARE IS PROVIDED BY AUTHOR AND CONTRIBUTORS ``AS IS'' AND 18 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 19 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 20 * ARE DISCLAIMED. IN NO EVENT SHALL AUTHOR OR CONTRIBUTORS BE LIABLE 21 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 22 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 23 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 24 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 25 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 26 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 27 * SUCH DAMAGE. 28 */ 29 30 #include <sys/cdefs.h> 31 __FBSDID("$FreeBSD$"); 32 33 /* 34 * Texas Instruments TWL4030/TWL5030/TWL60x0/TPS659x0 Power Management and 35 * Audio CODEC devices. 36 * 37 * This code is based on the Linux TWL multifunctional device driver, which is 38 * copyright (C) 2005-2006 Texas Instruments, Inc. 39 * 40 * These chips are typically used as support ICs for the OMAP range of embedded 41 * ARM processes/SOC from Texas Instruments. They are typically used to control 42 * on board voltages, however some variants have other features like audio 43 * codecs, USB OTG transceivers, RTC, PWM, etc. 44 * 45 * This driver acts as a bus for more specific companion devices. 46 * 47 */ 48 49 #include <sys/param.h> 50 #include <sys/systm.h> 51 #include <sys/kernel.h> 52 #include <sys/lock.h> 53 #include <sys/module.h> 54 #include <sys/bus.h> 55 #include <sys/resource.h> 56 #include <sys/rman.h> 57 #include <sys/sysctl.h> 58 #include <sys/mutex.h> 59 #include <sys/malloc.h> 60 61 #include <machine/bus.h> 62 #include <machine/resource.h> 63 #include <machine/intr.h> 64 65 #include <dev/iicbus/iicbus.h> 66 #include <dev/iicbus/iiconf.h> 67 68 #include <dev/ofw/openfirm.h> 69 #include <dev/ofw/ofw_bus.h> 70 #include <dev/ofw/ofw_bus_subr.h> 71 72 #include "arm/ti/twl/twl.h" 73 74 /* TWL device IDs */ 75 #define TWL_DEVICE_UNKNOWN 0xffff 76 #define TWL_DEVICE_4030 0x4030 77 #define TWL_DEVICE_6025 0x6025 78 #define TWL_DEVICE_6030 0x6030 79 80 /* Each TWL device typically has more than one I2C address */ 81 #define TWL_MAX_SUBADDRS 4 82 83 /* The maximum number of bytes that can be written in one call */ 84 #define TWL_MAX_IIC_DATA_SIZE 63 85 86 /* The TWL devices typically use 4 I2C address for the different internal 87 * register sets, plus one SmartReflex I2C address. 88 */ 89 #define TWL_CHIP_ID0 0x48 90 #define TWL_CHIP_ID1 0x49 91 #define TWL_CHIP_ID2 0x4A 92 #define TWL_CHIP_ID3 0x4B 93 94 #define TWL_SMARTREFLEX_CHIP_ID 0x12 95 96 #define TWL_INVALID_CHIP_ID 0xff 97 98 struct twl_softc { 99 device_t sc_dev; 100 struct mtx sc_mtx; 101 unsigned int sc_type; 102 103 uint8_t sc_subaddr_map[TWL_MAX_SUBADDRS]; 104 105 struct intr_config_hook sc_scan_hook; 106 107 device_t sc_vreg; 108 device_t sc_clks; 109 }; 110 111 /** 112 * Macros for driver mutex locking 113 */ 114 #define TWL_LOCK(_sc) mtx_lock(&(_sc)->sc_mtx) 115 #define TWL_UNLOCK(_sc) mtx_unlock(&(_sc)->sc_mtx) 116 #define TWL_LOCK_INIT(_sc) \ 117 mtx_init(&_sc->sc_mtx, device_get_nameunit(_sc->sc_dev), \ 118 "twl", MTX_DEF) 119 #define TWL_LOCK_DESTROY(_sc) mtx_destroy(&_sc->sc_mtx); 120 #define TWL_ASSERT_LOCKED(_sc) mtx_assert(&_sc->sc_mtx, MA_OWNED); 121 #define TWL_ASSERT_UNLOCKED(_sc) mtx_assert(&_sc->sc_mtx, MA_NOTOWNED); 122 123 /** 124 * twl_is_4030 - returns true if the device is TWL4030 125 * twl_is_6025 - returns true if the device is TWL6025 126 * twl_is_6030 - returns true if the device is TWL6030 127 * @sc: device soft context 128 * 129 * Returns a non-zero value if the device matches. 130 * 131 * RETURNS: 132 * Returns a non-zero value if the device matches, otherwise zero. 133 */ 134 int 135 twl_is_4030(device_t dev) 136 { 137 struct twl_softc *sc = device_get_softc(dev); 138 return (sc->sc_type == TWL_DEVICE_4030); 139 } 140 141 int 142 twl_is_6025(device_t dev) 143 { 144 struct twl_softc *sc = device_get_softc(dev); 145 return (sc->sc_type == TWL_DEVICE_6025); 146 } 147 148 int 149 twl_is_6030(device_t dev) 150 { 151 struct twl_softc *sc = device_get_softc(dev); 152 return (sc->sc_type == TWL_DEVICE_6030); 153 } 154 155 /** 156 * twl_read - read one or more registers from the TWL device 157 * @sc: device soft context 158 * @nsub: the sub-module to read from 159 * @reg: the register offset within the module to read 160 * @buf: buffer to store the bytes in 161 * @cnt: the number of bytes to read 162 * 163 * Reads one or more registers and stores the result in the suppled buffer. 164 * 165 * RETURNS: 166 * Zero on success or an error code on failure. 167 */ 168 int 169 twl_read(device_t dev, uint8_t nsub, uint8_t reg, uint8_t *buf, uint16_t cnt) 170 { 171 struct twl_softc *sc; 172 struct iic_msg msg[2]; 173 uint8_t addr; 174 int rc; 175 176 sc = device_get_softc(dev); 177 178 TWL_LOCK(sc); 179 addr = sc->sc_subaddr_map[nsub]; 180 TWL_UNLOCK(sc); 181 182 if (addr == TWL_INVALID_CHIP_ID) 183 return (EIO); 184 185 /* Set the address to read from */ 186 msg[0].slave = addr; 187 msg[0].flags = IIC_M_WR | IIC_M_NOSTOP; 188 msg[0].len = 1; 189 msg[0].buf = ® 190 /* Read the data back */ 191 msg[1].slave = addr; 192 msg[1].flags = IIC_M_RD; 193 msg[1].len = cnt; 194 msg[1].buf = buf; 195 196 rc = iicbus_transfer(dev, msg, 2); 197 if (rc != 0) { 198 device_printf(dev, "iicbus read failed (adr:0x%02x, reg:0x%02x)\n", 199 addr, reg); 200 return (EIO); 201 } 202 203 return (0); 204 } 205 206 /** 207 * twl_write - writes one or more registers to the TWL device 208 * @sc: device soft context 209 * @nsub: the sub-module to read from 210 * @reg: the register offset within the module to read 211 * @buf: data to write 212 * @cnt: the number of bytes to write 213 * 214 * Writes one or more registers. 215 * 216 * RETURNS: 217 * Zero on success or a negative error code on failure. 218 */ 219 int 220 twl_write(device_t dev, uint8_t nsub, uint8_t reg, uint8_t *buf, uint16_t cnt) 221 { 222 struct twl_softc *sc; 223 struct iic_msg msg; 224 uint8_t addr; 225 uint8_t tmp_buf[TWL_MAX_IIC_DATA_SIZE + 1]; 226 int rc; 227 228 if (cnt > TWL_MAX_IIC_DATA_SIZE) 229 return (ENOMEM); 230 231 /* Set the register address as the first byte */ 232 tmp_buf[0] = reg; 233 memcpy(&tmp_buf[1], buf, cnt); 234 235 sc = device_get_softc(dev); 236 237 TWL_LOCK(sc); 238 addr = sc->sc_subaddr_map[nsub]; 239 TWL_UNLOCK(sc); 240 241 if (addr == TWL_INVALID_CHIP_ID) 242 return (EIO); 243 244 /* Setup the transfer and execute it */ 245 msg.slave = addr; 246 msg.flags = IIC_M_WR; 247 msg.len = cnt + 1; 248 msg.buf = tmp_buf; 249 250 rc = iicbus_transfer(dev, &msg, 1); 251 if (rc != 0) { 252 device_printf(sc->sc_dev, "iicbus write failed (adr:0x%02x, reg:0x%02x)\n", 253 addr, reg); 254 return (EIO); 255 } 256 257 return (0); 258 } 259 260 /** 261 * twl_test_present - checks if a device with given address is present 262 * @sc: device soft context 263 * @addr: the address of the device to scan for 264 * 265 * Sends just the address byte and checks for an ACK. If no ACK then device 266 * is assumed to not be present. 267 * 268 * RETURNS: 269 * EIO if device is not present, otherwise 0 is returned. 270 */ 271 static int 272 twl_test_present(struct twl_softc *sc, uint8_t addr) 273 { 274 struct iic_msg msg; 275 uint8_t tmp; 276 277 /* Set the address to read from */ 278 msg.slave = addr; 279 msg.flags = IIC_M_RD; 280 msg.len = 1; 281 msg.buf = &tmp; 282 283 if (iicbus_transfer(sc->sc_dev, &msg, 1) != 0) 284 return (EIO); 285 286 return (0); 287 } 288 289 /** 290 * twl_scan - scans the i2c bus for sub modules 291 * @dev: the twl device 292 * 293 * TWL devices don't just have one i2c slave address, rather they have up to 294 * 5 other addresses, each is for separate modules within the device. This 295 * function scans the bus for 4 possible sub-devices and stores the info 296 * internally. 297 * 298 */ 299 static void 300 twl_scan(void *dev) 301 { 302 struct twl_softc *sc; 303 unsigned i; 304 uint8_t devs[TWL_MAX_SUBADDRS]; 305 uint8_t base = TWL_CHIP_ID0; 306 307 sc = device_get_softc((device_t)dev); 308 309 memset(devs, TWL_INVALID_CHIP_ID, TWL_MAX_SUBADDRS); 310 311 /* Try each of the addresses (0x48, 0x49, 0x4a & 0x4b) to determine which 312 * sub modules we have. 313 */ 314 for (i = 0; i < TWL_MAX_SUBADDRS; i++) { 315 if (twl_test_present(sc, (base + i)) == 0) { 316 devs[i] = (base + i); 317 device_printf(sc->sc_dev, "Found (sub)device at 0x%02x\n", (base + i)); 318 } 319 } 320 321 TWL_LOCK(sc); 322 memcpy(sc->sc_subaddr_map, devs, TWL_MAX_SUBADDRS); 323 TWL_UNLOCK(sc); 324 325 /* Finished with the interrupt hook */ 326 config_intrhook_disestablish(&sc->sc_scan_hook); 327 } 328 329 /** 330 * twl_probe - 331 * @dev: the twl device 332 * 333 * Scans the FDT for a match for the device, possible compatible device 334 * strings are; "ti,twl6030", "ti,twl6025", "ti,twl4030". 335 * 336 * The FDT compat string also determines the type of device (it is currently 337 * not possible to dynamically determine the device type). 338 * 339 */ 340 static int 341 twl_probe(device_t dev) 342 { 343 phandle_t node; 344 const char *compat; 345 int len, l; 346 struct twl_softc *sc; 347 348 if ((compat = ofw_bus_get_compat(dev)) == NULL) 349 return (ENXIO); 350 351 if ((node = ofw_bus_get_node(dev)) == 0) 352 return (ENXIO); 353 354 /* Get total 'compatible' prop len */ 355 if ((len = OF_getproplen(node, "compatible")) <= 0) 356 return (ENXIO); 357 358 sc = device_get_softc(dev); 359 sc->sc_dev = dev; 360 sc->sc_type = TWL_DEVICE_UNKNOWN; 361 362 while (len > 0) { 363 if (strncasecmp(compat, "ti,twl6030", 10) == 0) 364 sc->sc_type = TWL_DEVICE_6030; 365 else if (strncasecmp(compat, "ti,twl6025", 10) == 0) 366 sc->sc_type = TWL_DEVICE_6025; 367 else if (strncasecmp(compat, "ti,twl4030", 10) == 0) 368 sc->sc_type = TWL_DEVICE_4030; 369 370 if (sc->sc_type != TWL_DEVICE_UNKNOWN) 371 break; 372 373 /* Slide to the next sub-string. */ 374 l = strlen(compat) + 1; 375 compat += l; 376 len -= l; 377 } 378 379 switch (sc->sc_type) { 380 case TWL_DEVICE_4030: 381 device_set_desc(dev, "TI TWL4030/TPS659x0 Companion IC"); 382 break; 383 case TWL_DEVICE_6025: 384 device_set_desc(dev, "TI TWL6025 Companion IC"); 385 break; 386 case TWL_DEVICE_6030: 387 device_set_desc(dev, "TI TWL6030 Companion IC"); 388 break; 389 case TWL_DEVICE_UNKNOWN: 390 default: 391 return (ENXIO); 392 } 393 394 return (0); 395 } 396 397 static int 398 twl_attach(device_t dev) 399 { 400 struct twl_softc *sc; 401 402 sc = device_get_softc(dev); 403 sc->sc_dev = dev; 404 405 TWL_LOCK_INIT(sc); 406 407 /* We have to wait until interrupts are enabled. I2C read and write 408 * only works if the interrupts are available. 409 */ 410 sc->sc_scan_hook.ich_func = twl_scan; 411 sc->sc_scan_hook.ich_arg = dev; 412 413 if (config_intrhook_establish(&sc->sc_scan_hook) != 0) 414 return (ENOMEM); 415 416 /* FIXME: should be in DTS file */ 417 if ((sc->sc_vreg = device_add_child(dev, "twl_vreg", -1)) == NULL) 418 device_printf(dev, "could not allocate twl_vreg instance\n"); 419 if ((sc->sc_clks = device_add_child(dev, "twl_clks", -1)) == NULL) 420 device_printf(dev, "could not allocate twl_clks instance\n"); 421 422 return (bus_generic_attach(dev)); 423 } 424 425 static int 426 twl_detach(device_t dev) 427 { 428 struct twl_softc *sc; 429 430 sc = device_get_softc(dev); 431 432 if (sc->sc_vreg) 433 device_delete_child(dev, sc->sc_vreg); 434 if (sc->sc_clks) 435 device_delete_child(dev, sc->sc_clks); 436 437 TWL_LOCK_DESTROY(sc); 438 439 return (0); 440 } 441 442 static device_method_t twl_methods[] = { 443 DEVMETHOD(device_probe, twl_probe), 444 DEVMETHOD(device_attach, twl_attach), 445 DEVMETHOD(device_detach, twl_detach), 446 447 {0, 0}, 448 }; 449 450 static driver_t twl_driver = { 451 "twl", 452 twl_methods, 453 sizeof(struct twl_softc), 454 }; 455 456 DRIVER_MODULE(twl, iicbus, twl_driver, 0, 0); 457 MODULE_VERSION(twl, 1); 458