Dilip Kota | 81c8855 | 2017-10-24 12:18:23 +0530 | [diff] [blame] | 1 | /* Copyright (c) 2011-2018, The Linux Foundation. All rights reserved. |
Sagar Dharia | be37c9c | 2016-11-28 23:06:58 -0700 | [diff] [blame] | 2 | * |
| 3 | * This program is free software; you can redistribute it and/or modify |
| 4 | * it under the terms of the GNU General Public License version 2 and |
| 5 | * only version 2 as published by the Free Software Foundation. |
| 6 | * |
| 7 | * This program is distributed in the hope that it will be useful, |
| 8 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 9 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 10 | * GNU General Public License for more details. |
| 11 | */ |
| 12 | |
| 13 | #include <linux/kernel.h> |
| 14 | #include <linux/errno.h> |
| 15 | #include <linux/slab.h> |
| 16 | #include <linux/init.h> |
| 17 | #include <linux/completion.h> |
| 18 | #include <linux/idr.h> |
| 19 | #include <linux/pm_runtime.h> |
| 20 | #include <linux/slimbus/slimbus.h> |
| 21 | |
| 22 | #define SLIM_PORT_HDL(la, f, p) ((la)<<24 | (f) << 16 | (p)) |
| 23 | |
| 24 | #define SLIM_HDL_TO_LA(hdl) ((u32)((hdl) & 0xFF000000) >> 24) |
| 25 | #define SLIM_HDL_TO_FLOW(hdl) (((u32)(hdl) & 0xFF0000) >> 16) |
| 26 | #define SLIM_HDL_TO_PORT(hdl) ((u32)(hdl) & 0xFF) |
| 27 | |
| 28 | #define SLIM_HDL_TO_CHIDX(hdl) ((u16)(hdl) & 0xFF) |
| 29 | #define SLIM_GRP_TO_NCHAN(hdl) ((u16)(hdl >> 8) & 0xFF) |
| 30 | |
| 31 | #define SLIM_SLAVE_PORT(p, la) (((la)<<16) | (p)) |
| 32 | #define SLIM_MGR_PORT(p) ((0xFF << 16) | (p)) |
| 33 | #define SLIM_LA_MANAGER 0xFF |
| 34 | |
| 35 | #define SLIM_START_GRP (1 << 8) |
| 36 | #define SLIM_END_GRP (1 << 9) |
| 37 | |
| 38 | #define SLIM_MAX_INTR_COEFF_3 (SLIM_SL_PER_SUPERFRAME/3) |
| 39 | #define SLIM_MAX_INTR_COEFF_1 SLIM_SL_PER_SUPERFRAME |
| 40 | |
| 41 | static DEFINE_MUTEX(slim_lock); |
| 42 | static DEFINE_IDR(ctrl_idr); |
| 43 | static struct device_type slim_dev_type; |
| 44 | static struct device_type slim_ctrl_type; |
| 45 | |
| 46 | #define DEFINE_SLIM_LDEST_TXN(name, mc, len, rl, rbuf, wbuf, la) \ |
| 47 | struct slim_msg_txn name = { rl, 0, mc, SLIM_MSG_DEST_LOGICALADDR, 0,\ |
| 48 | len, 0, la, false, rbuf, wbuf, NULL, } |
| 49 | |
| 50 | #define DEFINE_SLIM_BCAST_TXN(name, mc, len, rl, rbuf, wbuf, la) \ |
| 51 | struct slim_msg_txn name = { rl, 0, mc, SLIM_MSG_DEST_BROADCAST, 0,\ |
| 52 | len, 0, la, false, rbuf, wbuf, NULL, } |
| 53 | |
| 54 | static const struct slim_device_id *slim_match(const struct slim_device_id *id, |
| 55 | const struct slim_device *slim_dev) |
| 56 | { |
| 57 | while (id->name[0]) { |
| 58 | if (strcmp(slim_dev->name, id->name) == 0) |
| 59 | return id; |
| 60 | id++; |
| 61 | } |
| 62 | return NULL; |
| 63 | } |
| 64 | |
| 65 | const struct slim_device_id *slim_get_device_id(const struct slim_device *sdev) |
| 66 | { |
| 67 | const struct slim_driver *sdrv = to_slim_driver(sdev->dev.driver); |
| 68 | |
| 69 | return slim_match(sdrv->id_table, sdev); |
| 70 | } |
| 71 | EXPORT_SYMBOL(slim_get_device_id); |
| 72 | |
| 73 | static int slim_device_match(struct device *dev, struct device_driver *driver) |
| 74 | { |
| 75 | struct slim_device *slim_dev; |
| 76 | struct slim_driver *drv = to_slim_driver(driver); |
| 77 | |
| 78 | if (dev->type == &slim_dev_type) |
| 79 | slim_dev = to_slim_device(dev); |
| 80 | else |
| 81 | return 0; |
| 82 | if (drv->id_table) |
| 83 | return slim_match(drv->id_table, slim_dev) != NULL; |
| 84 | |
| 85 | if (driver->name) |
| 86 | return strcmp(slim_dev->name, driver->name) == 0; |
| 87 | return 0; |
| 88 | } |
| 89 | |
| 90 | #ifdef CONFIG_PM_SLEEP |
| 91 | static int slim_legacy_suspend(struct device *dev, pm_message_t mesg) |
| 92 | { |
| 93 | struct slim_device *slim_dev = NULL; |
| 94 | struct slim_driver *driver; |
| 95 | |
| 96 | if (dev->type == &slim_dev_type) |
| 97 | slim_dev = to_slim_device(dev); |
| 98 | |
| 99 | if (!slim_dev || !dev->driver) |
| 100 | return 0; |
| 101 | |
| 102 | driver = to_slim_driver(dev->driver); |
| 103 | if (!driver->suspend) |
| 104 | return 0; |
| 105 | |
| 106 | return driver->suspend(slim_dev, mesg); |
| 107 | } |
| 108 | |
| 109 | static int slim_legacy_resume(struct device *dev) |
| 110 | { |
| 111 | struct slim_device *slim_dev = NULL; |
| 112 | struct slim_driver *driver; |
| 113 | |
| 114 | if (dev->type == &slim_dev_type) |
| 115 | slim_dev = to_slim_device(dev); |
| 116 | |
| 117 | if (!slim_dev || !dev->driver) |
| 118 | return 0; |
| 119 | |
| 120 | driver = to_slim_driver(dev->driver); |
| 121 | if (!driver->resume) |
| 122 | return 0; |
| 123 | |
| 124 | return driver->resume(slim_dev); |
| 125 | } |
| 126 | |
| 127 | static int slim_pm_suspend(struct device *dev) |
| 128 | { |
| 129 | const struct dev_pm_ops *pm = dev->driver ? dev->driver->pm : NULL; |
| 130 | |
| 131 | if (pm) |
| 132 | return pm_generic_suspend(dev); |
| 133 | else |
| 134 | return slim_legacy_suspend(dev, PMSG_SUSPEND); |
| 135 | } |
| 136 | |
| 137 | static int slim_pm_resume(struct device *dev) |
| 138 | { |
| 139 | const struct dev_pm_ops *pm = dev->driver ? dev->driver->pm : NULL; |
| 140 | |
| 141 | if (pm) |
| 142 | return pm_generic_resume(dev); |
| 143 | else |
| 144 | return slim_legacy_resume(dev); |
| 145 | } |
| 146 | |
| 147 | #else |
| 148 | #define slim_pm_suspend NULL |
| 149 | #define slim_pm_resume NULL |
| 150 | #endif |
| 151 | |
| 152 | static const struct dev_pm_ops slimbus_pm = { |
| 153 | .suspend = slim_pm_suspend, |
| 154 | .resume = slim_pm_resume, |
| 155 | SET_RUNTIME_PM_OPS( |
| 156 | pm_generic_suspend, |
| 157 | pm_generic_resume, |
| 158 | NULL |
| 159 | ) |
| 160 | }; |
| 161 | struct bus_type slimbus_type = { |
| 162 | .name = "slimbus", |
| 163 | .match = slim_device_match, |
| 164 | .pm = &slimbus_pm, |
| 165 | }; |
| 166 | EXPORT_SYMBOL(slimbus_type); |
| 167 | |
| 168 | struct device slimbus_dev = { |
| 169 | .init_name = "slimbus", |
| 170 | }; |
| 171 | |
| 172 | static void __exit slimbus_exit(void) |
| 173 | { |
| 174 | device_unregister(&slimbus_dev); |
| 175 | bus_unregister(&slimbus_type); |
| 176 | } |
| 177 | |
| 178 | static int __init slimbus_init(void) |
| 179 | { |
| 180 | int retval; |
| 181 | |
| 182 | retval = bus_register(&slimbus_type); |
| 183 | if (!retval) |
| 184 | retval = device_register(&slimbus_dev); |
| 185 | |
| 186 | if (retval) |
| 187 | bus_unregister(&slimbus_type); |
| 188 | |
| 189 | return retval; |
| 190 | } |
| 191 | postcore_initcall(slimbus_init); |
| 192 | module_exit(slimbus_exit); |
| 193 | |
| 194 | static int slim_drv_probe(struct device *dev) |
| 195 | { |
| 196 | const struct slim_driver *sdrv = to_slim_driver(dev->driver); |
| 197 | struct slim_device *sbdev = to_slim_device(dev); |
| 198 | struct slim_controller *ctrl = sbdev->ctrl; |
| 199 | |
| 200 | if (sdrv->probe) { |
| 201 | int ret; |
| 202 | |
| 203 | ret = sdrv->probe(sbdev); |
| 204 | if (ret) |
| 205 | return ret; |
| 206 | if (sdrv->device_up) |
| 207 | queue_work(ctrl->wq, &sbdev->wd); |
| 208 | return 0; |
| 209 | } |
| 210 | return -ENODEV; |
| 211 | } |
| 212 | |
| 213 | static int slim_drv_remove(struct device *dev) |
| 214 | { |
| 215 | const struct slim_driver *sdrv = to_slim_driver(dev->driver); |
| 216 | struct slim_device *sbdev = to_slim_device(dev); |
| 217 | |
| 218 | sbdev->notified = false; |
| 219 | if (sdrv->remove) |
| 220 | return sdrv->remove(to_slim_device(dev)); |
| 221 | return -ENODEV; |
| 222 | } |
| 223 | |
| 224 | static void slim_drv_shutdown(struct device *dev) |
| 225 | { |
| 226 | const struct slim_driver *sdrv = to_slim_driver(dev->driver); |
| 227 | |
| 228 | if (sdrv->shutdown) |
| 229 | sdrv->shutdown(to_slim_device(dev)); |
| 230 | } |
| 231 | |
| 232 | /* |
| 233 | * slim_driver_register: Client driver registration with slimbus |
| 234 | * @drv:Client driver to be associated with client-device. |
| 235 | * This API will register the client driver with the slimbus |
| 236 | * It is called from the driver's module-init function. |
| 237 | */ |
| 238 | int slim_driver_register(struct slim_driver *drv) |
| 239 | { |
| 240 | drv->driver.bus = &slimbus_type; |
| 241 | if (drv->probe) |
| 242 | drv->driver.probe = slim_drv_probe; |
| 243 | |
| 244 | if (drv->remove) |
| 245 | drv->driver.remove = slim_drv_remove; |
| 246 | |
| 247 | if (drv->shutdown) |
| 248 | drv->driver.shutdown = slim_drv_shutdown; |
| 249 | |
| 250 | return driver_register(&drv->driver); |
| 251 | } |
| 252 | EXPORT_SYMBOL(slim_driver_register); |
| 253 | |
| 254 | /* |
| 255 | * slim_driver_unregister: Undo effects of slim_driver_register |
| 256 | * @drv: Client driver to be unregistered |
| 257 | */ |
| 258 | void slim_driver_unregister(struct slim_driver *drv) |
| 259 | { |
| 260 | if (drv) |
| 261 | driver_unregister(&drv->driver); |
| 262 | } |
| 263 | EXPORT_SYMBOL(slim_driver_unregister); |
| 264 | |
| 265 | #define slim_ctrl_attr_gr NULL |
| 266 | |
| 267 | static void slim_ctrl_release(struct device *dev) |
| 268 | { |
| 269 | struct slim_controller *ctrl = to_slim_controller(dev); |
| 270 | |
| 271 | complete(&ctrl->dev_released); |
| 272 | } |
| 273 | |
| 274 | static struct device_type slim_ctrl_type = { |
| 275 | .groups = slim_ctrl_attr_gr, |
| 276 | .release = slim_ctrl_release, |
| 277 | }; |
| 278 | |
| 279 | static struct slim_controller *slim_ctrl_get(struct slim_controller *ctrl) |
| 280 | { |
| 281 | if (!ctrl || !get_device(&ctrl->dev)) |
| 282 | return NULL; |
| 283 | |
| 284 | return ctrl; |
| 285 | } |
| 286 | |
| 287 | static void slim_ctrl_put(struct slim_controller *ctrl) |
| 288 | { |
| 289 | if (ctrl) |
| 290 | put_device(&ctrl->dev); |
| 291 | } |
| 292 | |
| 293 | #define slim_device_attr_gr NULL |
| 294 | #define slim_device_uevent NULL |
| 295 | static void slim_dev_release(struct device *dev) |
| 296 | { |
| 297 | struct slim_device *sbdev = to_slim_device(dev); |
| 298 | |
| 299 | slim_ctrl_put(sbdev->ctrl); |
| 300 | } |
| 301 | |
| 302 | static struct device_type slim_dev_type = { |
| 303 | .groups = slim_device_attr_gr, |
| 304 | .uevent = slim_device_uevent, |
| 305 | .release = slim_dev_release, |
| 306 | }; |
| 307 | |
| 308 | static void slim_report(struct work_struct *work) |
| 309 | { |
| 310 | struct slim_driver *sbdrv; |
| 311 | struct slim_device *sbdev = |
| 312 | container_of(work, struct slim_device, wd); |
| 313 | if (!sbdev->dev.driver) |
| 314 | return; |
| 315 | /* check if device-up or down needs to be called */ |
| 316 | if ((!sbdev->reported && !sbdev->notified) || |
| 317 | (sbdev->reported && sbdev->notified)) |
| 318 | return; |
| 319 | |
| 320 | sbdrv = to_slim_driver(sbdev->dev.driver); |
| 321 | /* |
| 322 | * address no longer valid, means device reported absent, whereas |
| 323 | * address valid, means device reported present |
| 324 | */ |
| 325 | if (sbdev->notified && !sbdev->reported) { |
| 326 | sbdev->notified = false; |
| 327 | if (sbdrv->device_down) |
| 328 | sbdrv->device_down(sbdev); |
| 329 | } else if (!sbdev->notified && sbdev->reported) { |
| 330 | sbdev->notified = true; |
| 331 | if (sbdrv->device_up) |
| 332 | sbdrv->device_up(sbdev); |
| 333 | } |
| 334 | } |
| 335 | |
Karthikeyan Ramasubramanian | 6fcf9fc | 2017-10-30 14:03:01 -0600 | [diff] [blame] | 336 | static void slim_device_reset(struct work_struct *work) |
| 337 | { |
| 338 | struct slim_driver *sbdrv; |
| 339 | struct slim_device *sbdev = |
| 340 | container_of(work, struct slim_device, device_reset); |
| 341 | |
| 342 | if (!sbdev->dev.driver) |
| 343 | return; |
| 344 | |
| 345 | sbdrv = to_slim_driver(sbdev->dev.driver); |
| 346 | if (sbdrv && sbdrv->reset_device) |
| 347 | sbdrv->reset_device(sbdev); |
| 348 | } |
| 349 | |
Sagar Dharia | be37c9c | 2016-11-28 23:06:58 -0700 | [diff] [blame] | 350 | /* |
| 351 | * slim_add_device: Add a new device without register board info. |
| 352 | * @ctrl: Controller to which this device is to be added to. |
| 353 | * Called when device doesn't have an explicit client-driver to be probed, or |
| 354 | * the client-driver is a module installed dynamically. |
| 355 | */ |
| 356 | int slim_add_device(struct slim_controller *ctrl, struct slim_device *sbdev) |
| 357 | { |
| 358 | sbdev->dev.bus = &slimbus_type; |
| 359 | sbdev->dev.parent = ctrl->dev.parent; |
| 360 | sbdev->dev.type = &slim_dev_type; |
| 361 | sbdev->dev.driver = NULL; |
| 362 | sbdev->ctrl = ctrl; |
| 363 | slim_ctrl_get(ctrl); |
| 364 | dev_set_name(&sbdev->dev, "%s", sbdev->name); |
| 365 | mutex_init(&sbdev->sldev_reconf); |
| 366 | INIT_LIST_HEAD(&sbdev->mark_define); |
| 367 | INIT_LIST_HEAD(&sbdev->mark_suspend); |
| 368 | INIT_LIST_HEAD(&sbdev->mark_removal); |
| 369 | INIT_WORK(&sbdev->wd, slim_report); |
Karthikeyan Ramasubramanian | 6fcf9fc | 2017-10-30 14:03:01 -0600 | [diff] [blame] | 370 | INIT_WORK(&sbdev->device_reset, slim_device_reset); |
Sagar Dharia | be37c9c | 2016-11-28 23:06:58 -0700 | [diff] [blame] | 371 | mutex_lock(&ctrl->m_ctrl); |
| 372 | list_add_tail(&sbdev->dev_list, &ctrl->devs); |
| 373 | mutex_unlock(&ctrl->m_ctrl); |
| 374 | /* probe slave on this controller */ |
| 375 | return device_register(&sbdev->dev); |
| 376 | } |
| 377 | EXPORT_SYMBOL(slim_add_device); |
| 378 | |
| 379 | struct sbi_boardinfo { |
| 380 | struct list_head list; |
| 381 | struct slim_boardinfo board_info; |
| 382 | }; |
| 383 | |
| 384 | static LIST_HEAD(board_list); |
| 385 | static LIST_HEAD(slim_ctrl_list); |
| 386 | static DEFINE_MUTEX(board_lock); |
| 387 | |
| 388 | /* If controller is not present, only add to boards list */ |
| 389 | static void slim_match_ctrl_to_boardinfo(struct slim_controller *ctrl, |
| 390 | struct slim_boardinfo *bi) |
| 391 | { |
| 392 | int ret; |
| 393 | |
| 394 | if (ctrl->nr != bi->bus_num) |
| 395 | return; |
| 396 | |
| 397 | ret = slim_add_device(ctrl, bi->slim_slave); |
| 398 | if (ret != 0) |
| 399 | dev_err(ctrl->dev.parent, "can't create new device for %s\n", |
| 400 | bi->slim_slave->name); |
| 401 | } |
| 402 | |
| 403 | /* |
| 404 | * slim_register_board_info: Board-initialization routine. |
| 405 | * @info: List of all devices on all controllers present on the board. |
| 406 | * @n: number of entries. |
| 407 | * API enumerates respective devices on corresponding controller. |
| 408 | * Called from board-init function. |
| 409 | */ |
| 410 | int slim_register_board_info(struct slim_boardinfo const *info, unsigned int n) |
| 411 | { |
| 412 | struct sbi_boardinfo *bi; |
| 413 | int i; |
| 414 | |
| 415 | bi = kcalloc(n, sizeof(*bi), GFP_KERNEL); |
| 416 | if (!bi) |
| 417 | return -ENOMEM; |
| 418 | |
| 419 | for (i = 0; i < n; i++, bi++, info++) { |
| 420 | struct slim_controller *ctrl; |
| 421 | |
| 422 | memcpy(&bi->board_info, info, sizeof(*info)); |
| 423 | mutex_lock(&board_lock); |
| 424 | list_add_tail(&bi->list, &board_list); |
| 425 | list_for_each_entry(ctrl, &slim_ctrl_list, list) |
| 426 | slim_match_ctrl_to_boardinfo(ctrl, &bi->board_info); |
| 427 | mutex_unlock(&board_lock); |
| 428 | } |
| 429 | return 0; |
| 430 | } |
| 431 | EXPORT_SYMBOL(slim_register_board_info); |
| 432 | |
| 433 | /* |
| 434 | * slim_ctrl_add_boarddevs: Add devices registered by board-info |
| 435 | * @ctrl: Controller to which these devices are to be added to. |
| 436 | * This API is called by controller when it is up and running. |
| 437 | * If devices on a controller were registered before controller, |
| 438 | * this will make sure that they get probed when controller is up. |
| 439 | */ |
| 440 | void slim_ctrl_add_boarddevs(struct slim_controller *ctrl) |
| 441 | { |
| 442 | struct sbi_boardinfo *bi; |
| 443 | |
| 444 | mutex_lock(&board_lock); |
| 445 | list_add_tail(&ctrl->list, &slim_ctrl_list); |
| 446 | list_for_each_entry(bi, &board_list, list) |
| 447 | slim_match_ctrl_to_boardinfo(ctrl, &bi->board_info); |
| 448 | mutex_unlock(&board_lock); |
| 449 | } |
| 450 | EXPORT_SYMBOL(slim_ctrl_add_boarddevs); |
| 451 | |
| 452 | /* |
| 453 | * slim_busnum_to_ctrl: Map bus number to controller |
| 454 | * @busnum: Bus number |
| 455 | * Returns controller representing this bus number |
| 456 | */ |
| 457 | struct slim_controller *slim_busnum_to_ctrl(u32 bus_num) |
| 458 | { |
| 459 | struct slim_controller *ctrl; |
| 460 | |
| 461 | mutex_lock(&board_lock); |
| 462 | list_for_each_entry(ctrl, &slim_ctrl_list, list) |
| 463 | if (bus_num == ctrl->nr) { |
| 464 | mutex_unlock(&board_lock); |
| 465 | return ctrl; |
| 466 | } |
| 467 | mutex_unlock(&board_lock); |
| 468 | return NULL; |
| 469 | } |
| 470 | EXPORT_SYMBOL(slim_busnum_to_ctrl); |
| 471 | |
| 472 | static int slim_register_controller(struct slim_controller *ctrl) |
| 473 | { |
| 474 | int ret = 0; |
| 475 | |
| 476 | /* Can't register until after driver model init */ |
| 477 | if (WARN_ON(!slimbus_type.p)) { |
| 478 | ret = -EPROBE_DEFER; |
| 479 | goto out_list; |
| 480 | } |
| 481 | |
| 482 | dev_set_name(&ctrl->dev, "sb-%d", ctrl->nr); |
| 483 | ctrl->dev.bus = &slimbus_type; |
| 484 | ctrl->dev.type = &slim_ctrl_type; |
| 485 | ctrl->num_dev = 0; |
| 486 | if (!ctrl->min_cg) |
| 487 | ctrl->min_cg = SLIM_MIN_CLK_GEAR; |
| 488 | if (!ctrl->max_cg) |
| 489 | ctrl->max_cg = SLIM_MAX_CLK_GEAR; |
| 490 | spin_lock_init(&ctrl->txn_lock); |
| 491 | mutex_init(&ctrl->m_ctrl); |
| 492 | mutex_init(&ctrl->sched.m_reconf); |
| 493 | ret = device_register(&ctrl->dev); |
| 494 | if (ret) |
| 495 | goto out_list; |
| 496 | |
| 497 | dev_dbg(&ctrl->dev, "Bus [%s] registered:dev:%p\n", ctrl->name, |
| 498 | &ctrl->dev); |
| 499 | |
| 500 | if (ctrl->nports) { |
| 501 | ctrl->ports = kcalloc(ctrl->nports, sizeof(struct slim_port), |
| 502 | GFP_KERNEL); |
| 503 | if (!ctrl->ports) { |
| 504 | ret = -ENOMEM; |
| 505 | goto err_port_failed; |
| 506 | } |
| 507 | } |
| 508 | if (ctrl->nchans) { |
| 509 | ctrl->chans = kcalloc(ctrl->nchans, sizeof(struct slim_ich), |
| 510 | GFP_KERNEL); |
| 511 | if (!ctrl->chans) { |
| 512 | ret = -ENOMEM; |
| 513 | goto err_chan_failed; |
| 514 | } |
| 515 | |
| 516 | ctrl->sched.chc1 = kcalloc(ctrl->nchans, |
| 517 | sizeof(struct slim_ich *), GFP_KERNEL); |
| 518 | if (!ctrl->sched.chc1) { |
| 519 | kfree(ctrl->chans); |
| 520 | ret = -ENOMEM; |
| 521 | goto err_chan_failed; |
| 522 | } |
| 523 | ctrl->sched.chc3 = kcalloc(ctrl->nchans, |
| 524 | sizeof(struct slim_ich *), GFP_KERNEL); |
| 525 | if (!ctrl->sched.chc3) { |
| 526 | kfree(ctrl->sched.chc1); |
| 527 | kfree(ctrl->chans); |
| 528 | ret = -ENOMEM; |
| 529 | goto err_chan_failed; |
| 530 | } |
| 531 | } |
| 532 | #ifdef DEBUG |
| 533 | ctrl->sched.slots = kzalloc(SLIM_SL_PER_SUPERFRAME, GFP_KERNEL); |
| 534 | #endif |
| 535 | init_completion(&ctrl->pause_comp); |
| 536 | |
| 537 | INIT_LIST_HEAD(&ctrl->devs); |
| 538 | ctrl->wq = create_singlethread_workqueue(dev_name(&ctrl->dev)); |
| 539 | if (!ctrl->wq) |
| 540 | goto err_workq_failed; |
| 541 | |
| 542 | return 0; |
| 543 | |
| 544 | err_workq_failed: |
| 545 | kfree(ctrl->sched.chc3); |
| 546 | kfree(ctrl->sched.chc1); |
| 547 | kfree(ctrl->chans); |
| 548 | err_chan_failed: |
| 549 | kfree(ctrl->ports); |
| 550 | err_port_failed: |
| 551 | device_unregister(&ctrl->dev); |
| 552 | out_list: |
| 553 | mutex_lock(&slim_lock); |
| 554 | idr_remove(&ctrl_idr, ctrl->nr); |
| 555 | mutex_unlock(&slim_lock); |
| 556 | return ret; |
| 557 | } |
| 558 | |
| 559 | /* slim_remove_device: Remove the effect of slim_add_device() */ |
| 560 | void slim_remove_device(struct slim_device *sbdev) |
| 561 | { |
| 562 | struct slim_controller *ctrl = sbdev->ctrl; |
| 563 | |
| 564 | mutex_lock(&ctrl->m_ctrl); |
| 565 | list_del_init(&sbdev->dev_list); |
| 566 | mutex_unlock(&ctrl->m_ctrl); |
| 567 | device_unregister(&sbdev->dev); |
| 568 | } |
| 569 | EXPORT_SYMBOL(slim_remove_device); |
| 570 | |
| 571 | static void slim_ctrl_remove_device(struct slim_controller *ctrl, |
| 572 | struct slim_boardinfo *bi) |
| 573 | { |
| 574 | if (ctrl->nr == bi->bus_num) |
| 575 | slim_remove_device(bi->slim_slave); |
| 576 | } |
| 577 | |
| 578 | /* |
| 579 | * slim_del_controller: Controller tear-down. |
| 580 | * Controller added with the above API is teared down using this API. |
| 581 | */ |
| 582 | int slim_del_controller(struct slim_controller *ctrl) |
| 583 | { |
| 584 | struct slim_controller *found; |
| 585 | struct sbi_boardinfo *bi; |
| 586 | |
| 587 | /* First make sure that this bus was added */ |
| 588 | mutex_lock(&slim_lock); |
| 589 | found = idr_find(&ctrl_idr, ctrl->nr); |
| 590 | mutex_unlock(&slim_lock); |
| 591 | if (found != ctrl) |
| 592 | return -EINVAL; |
| 593 | |
| 594 | /* Remove all clients */ |
| 595 | mutex_lock(&board_lock); |
| 596 | list_for_each_entry(bi, &board_list, list) |
| 597 | slim_ctrl_remove_device(ctrl, &bi->board_info); |
| 598 | mutex_unlock(&board_lock); |
| 599 | |
| 600 | init_completion(&ctrl->dev_released); |
| 601 | device_unregister(&ctrl->dev); |
| 602 | |
| 603 | wait_for_completion(&ctrl->dev_released); |
| 604 | list_del(&ctrl->list); |
| 605 | destroy_workqueue(ctrl->wq); |
| 606 | /* free bus id */ |
| 607 | mutex_lock(&slim_lock); |
| 608 | idr_remove(&ctrl_idr, ctrl->nr); |
| 609 | mutex_unlock(&slim_lock); |
| 610 | |
| 611 | kfree(ctrl->sched.chc1); |
| 612 | kfree(ctrl->sched.chc3); |
| 613 | #ifdef DEBUG |
| 614 | kfree(ctrl->sched.slots); |
| 615 | #endif |
| 616 | kfree(ctrl->chans); |
| 617 | kfree(ctrl->ports); |
| 618 | |
| 619 | return 0; |
| 620 | } |
| 621 | EXPORT_SYMBOL(slim_del_controller); |
| 622 | |
| 623 | /* |
| 624 | * slim_add_numbered_controller: Controller bring-up. |
| 625 | * @ctrl: Controller to be registered. |
| 626 | * A controller is registered with the framework using this API. ctrl->nr is the |
| 627 | * desired number with which slimbus framework registers the controller. |
| 628 | * Function will return -EBUSY if the number is in use. |
| 629 | */ |
| 630 | int slim_add_numbered_controller(struct slim_controller *ctrl) |
| 631 | { |
| 632 | int id; |
| 633 | |
| 634 | mutex_lock(&slim_lock); |
| 635 | id = idr_alloc(&ctrl_idr, ctrl, ctrl->nr, ctrl->nr + 1, GFP_KERNEL); |
| 636 | mutex_unlock(&slim_lock); |
| 637 | |
| 638 | if (id < 0) |
| 639 | return id; |
| 640 | |
| 641 | ctrl->nr = id; |
| 642 | return slim_register_controller(ctrl); |
| 643 | } |
| 644 | EXPORT_SYMBOL(slim_add_numbered_controller); |
| 645 | |
| 646 | /* |
| 647 | * slim_report_absent: Controller calls this function when a device |
| 648 | * reports absent, OR when the device cannot be communicated with |
| 649 | * @sbdev: Device that cannot be reached, or sent report absent |
| 650 | */ |
| 651 | void slim_report_absent(struct slim_device *sbdev) |
| 652 | { |
| 653 | struct slim_controller *ctrl; |
| 654 | int i; |
| 655 | |
| 656 | if (!sbdev) |
| 657 | return; |
| 658 | ctrl = sbdev->ctrl; |
| 659 | if (!ctrl) |
| 660 | return; |
| 661 | /* invalidate logical addresses */ |
| 662 | mutex_lock(&ctrl->m_ctrl); |
| 663 | for (i = 0; i < ctrl->num_dev; i++) { |
| 664 | if (sbdev->laddr == ctrl->addrt[i].laddr) |
| 665 | ctrl->addrt[i].valid = false; |
| 666 | } |
| 667 | mutex_unlock(&ctrl->m_ctrl); |
| 668 | sbdev->reported = false; |
| 669 | queue_work(ctrl->wq, &sbdev->wd); |
| 670 | } |
| 671 | EXPORT_SYMBOL(slim_report_absent); |
| 672 | |
| 673 | static int slim_remove_ch(struct slim_controller *ctrl, struct slim_ich *slc); |
| 674 | /* |
| 675 | * slim_framer_booted: This function is called by controller after the active |
| 676 | * framer has booted (using Bus Reset sequence, or after it has shutdown and has |
| 677 | * come back up). Components, devices on the bus may be in undefined state, |
| 678 | * and this function triggers their drivers to do the needful |
| 679 | * to bring them back in Reset state so that they can acquire sync, report |
| 680 | * present and be operational again. |
| 681 | */ |
| 682 | void slim_framer_booted(struct slim_controller *ctrl) |
| 683 | { |
| 684 | struct slim_device *sbdev; |
| 685 | struct list_head *pos, *next; |
| 686 | int i; |
| 687 | |
| 688 | if (!ctrl) |
| 689 | return; |
| 690 | |
| 691 | /* Since framer has rebooted, reset all data channels */ |
| 692 | mutex_lock(&ctrl->sched.m_reconf); |
| 693 | for (i = 0; i < ctrl->nchans; i++) { |
| 694 | struct slim_ich *slc = &ctrl->chans[i]; |
| 695 | |
| 696 | if (slc->state > SLIM_CH_DEFINED) |
| 697 | slim_remove_ch(ctrl, slc); |
| 698 | } |
| 699 | mutex_unlock(&ctrl->sched.m_reconf); |
| 700 | mutex_lock(&ctrl->m_ctrl); |
| 701 | list_for_each_safe(pos, next, &ctrl->devs) { |
Sagar Dharia | be37c9c | 2016-11-28 23:06:58 -0700 | [diff] [blame] | 702 | sbdev = list_entry(pos, struct slim_device, dev_list); |
Karthikeyan Ramasubramanian | 6fcf9fc | 2017-10-30 14:03:01 -0600 | [diff] [blame] | 703 | if (sbdev) |
| 704 | queue_work(ctrl->wq, &sbdev->device_reset); |
Sagar Dharia | be37c9c | 2016-11-28 23:06:58 -0700 | [diff] [blame] | 705 | } |
| 706 | mutex_unlock(&ctrl->m_ctrl); |
| 707 | } |
| 708 | EXPORT_SYMBOL(slim_framer_booted); |
| 709 | |
| 710 | /* |
| 711 | * slim_msg_response: Deliver Message response received from a device to the |
| 712 | * framework. |
| 713 | * @ctrl: Controller handle |
| 714 | * @reply: Reply received from the device |
| 715 | * @len: Length of the reply |
| 716 | * @tid: Transaction ID received with which framework can associate reply. |
| 717 | * Called by controller to inform framework about the response received. |
| 718 | * This helps in making the API asynchronous, and controller-driver doesn't need |
| 719 | * to manage 1 more table other than the one managed by framework mapping TID |
| 720 | * with buffers |
| 721 | */ |
| 722 | void slim_msg_response(struct slim_controller *ctrl, u8 *reply, u8 tid, u8 len) |
| 723 | { |
| 724 | int i; |
| 725 | unsigned long flags; |
| 726 | bool async; |
| 727 | struct slim_msg_txn *txn; |
| 728 | |
| 729 | spin_lock_irqsave(&ctrl->txn_lock, flags); |
| 730 | txn = ctrl->txnt[tid]; |
| 731 | if (txn == NULL || txn->rbuf == NULL) { |
| 732 | spin_unlock_irqrestore(&ctrl->txn_lock, flags); |
| 733 | if (txn == NULL) |
| 734 | dev_err(&ctrl->dev, "Got response to invalid TID:%d, len:%d", |
| 735 | tid, len); |
| 736 | else |
| 737 | dev_err(&ctrl->dev, "Invalid client buffer passed\n"); |
| 738 | return; |
| 739 | } |
| 740 | async = txn->async; |
| 741 | for (i = 0; i < len; i++) |
| 742 | txn->rbuf[i] = reply[i]; |
| 743 | if (txn->comp) |
| 744 | complete(txn->comp); |
| 745 | ctrl->txnt[tid] = NULL; |
| 746 | spin_unlock_irqrestore(&ctrl->txn_lock, flags); |
| 747 | if (async) |
| 748 | kfree(txn); |
| 749 | } |
| 750 | EXPORT_SYMBOL(slim_msg_response); |
| 751 | |
| 752 | static int slim_processtxn(struct slim_controller *ctrl, |
| 753 | struct slim_msg_txn *txn, bool need_tid) |
| 754 | { |
| 755 | u8 i = 0; |
| 756 | int ret = 0; |
| 757 | unsigned long flags; |
| 758 | |
| 759 | if (need_tid) { |
| 760 | spin_lock_irqsave(&ctrl->txn_lock, flags); |
| 761 | for (i = 0; i < ctrl->last_tid; i++) { |
| 762 | if (ctrl->txnt[i] == NULL) |
| 763 | break; |
| 764 | } |
| 765 | if (i >= ctrl->last_tid) { |
| 766 | if (ctrl->last_tid == 255) { |
| 767 | spin_unlock_irqrestore(&ctrl->txn_lock, flags); |
| 768 | return -ENOMEM; |
| 769 | } |
| 770 | ctrl->last_tid++; |
| 771 | } |
| 772 | ctrl->txnt[i] = txn; |
| 773 | txn->tid = i; |
| 774 | spin_unlock_irqrestore(&ctrl->txn_lock, flags); |
| 775 | } |
| 776 | |
| 777 | ret = ctrl->xfer_msg(ctrl, txn); |
| 778 | return ret; |
| 779 | } |
| 780 | |
| 781 | static int ctrl_getlogical_addr(struct slim_controller *ctrl, const u8 *eaddr, |
| 782 | u8 e_len, u8 *entry) |
| 783 | { |
| 784 | u8 i; |
| 785 | |
| 786 | for (i = 0; i < ctrl->num_dev; i++) { |
| 787 | if (ctrl->addrt[i].valid && |
| 788 | memcmp(ctrl->addrt[i].eaddr, eaddr, e_len) == 0) { |
| 789 | *entry = i; |
| 790 | return 0; |
| 791 | } |
| 792 | } |
| 793 | return -ENXIO; |
| 794 | } |
| 795 | |
| 796 | /* |
| 797 | * slim_assign_laddr: Assign logical address to a device enumerated. |
| 798 | * @ctrl: Controller with which device is enumerated. |
| 799 | * @e_addr: 6-byte elemental address of the device. |
| 800 | * @e_len: buffer length for e_addr |
| 801 | * @laddr: Return logical address (if valid flag is false) |
| 802 | * @valid: true if laddr holds a valid address that controller wants to |
| 803 | * set for this enumeration address. Otherwise framework sets index into |
| 804 | * address table as logical address. |
| 805 | * Called by controller in response to REPORT_PRESENT. Framework will assign |
| 806 | * a logical address to this enumeration address. |
| 807 | * Function returns -EXFULL to indicate that all logical addresses are already |
| 808 | * taken. |
| 809 | */ |
| 810 | int slim_assign_laddr(struct slim_controller *ctrl, const u8 *e_addr, |
| 811 | u8 e_len, u8 *laddr, bool valid) |
| 812 | { |
| 813 | int ret; |
| 814 | u8 i = 0; |
| 815 | bool exists = false; |
| 816 | struct slim_device *sbdev; |
| 817 | struct list_head *pos, *next; |
| 818 | void *new_addrt = NULL; |
| 819 | |
| 820 | mutex_lock(&ctrl->m_ctrl); |
| 821 | /* already assigned */ |
| 822 | if (ctrl_getlogical_addr(ctrl, e_addr, e_len, &i) == 0) { |
| 823 | *laddr = ctrl->addrt[i].laddr; |
| 824 | exists = true; |
| 825 | } else { |
| 826 | if (ctrl->num_dev >= 254) { |
| 827 | ret = -EXFULL; |
| 828 | goto ret_assigned_laddr; |
| 829 | } |
| 830 | for (i = 0; i < ctrl->num_dev; i++) { |
| 831 | if (ctrl->addrt[i].valid == false) |
| 832 | break; |
| 833 | } |
| 834 | if (i == ctrl->num_dev) { |
| 835 | new_addrt = krealloc(ctrl->addrt, |
| 836 | (ctrl->num_dev + 1) * |
| 837 | sizeof(struct slim_addrt), |
| 838 | GFP_KERNEL); |
| 839 | if (!new_addrt) { |
| 840 | ret = -ENOMEM; |
| 841 | goto ret_assigned_laddr; |
| 842 | } |
| 843 | ctrl->addrt = new_addrt; |
| 844 | ctrl->num_dev++; |
| 845 | } |
| 846 | memcpy(ctrl->addrt[i].eaddr, e_addr, e_len); |
| 847 | ctrl->addrt[i].valid = true; |
| 848 | /* Preferred address is index into table */ |
| 849 | if (!valid) |
| 850 | *laddr = i; |
| 851 | } |
| 852 | |
| 853 | ret = ctrl->set_laddr(ctrl, (const u8 *)&ctrl->addrt[i].eaddr, 6, |
| 854 | *laddr); |
| 855 | if (ret) { |
| 856 | ctrl->addrt[i].valid = false; |
| 857 | goto ret_assigned_laddr; |
| 858 | } |
| 859 | ctrl->addrt[i].laddr = *laddr; |
| 860 | |
| 861 | dev_dbg(&ctrl->dev, "setting slimbus l-addr:%x\n", *laddr); |
| 862 | ret_assigned_laddr: |
| 863 | mutex_unlock(&ctrl->m_ctrl); |
| 864 | if (exists || ret) |
| 865 | return ret; |
| 866 | |
| 867 | pr_info("slimbus:%d laddr:0x%x, EAPC:0x%x:0x%x", ctrl->nr, *laddr, |
| 868 | e_addr[1], e_addr[2]); |
| 869 | mutex_lock(&ctrl->m_ctrl); |
| 870 | list_for_each_safe(pos, next, &ctrl->devs) { |
| 871 | sbdev = list_entry(pos, struct slim_device, dev_list); |
| 872 | if (memcmp(sbdev->e_addr, e_addr, 6) == 0) { |
| 873 | struct slim_driver *sbdrv; |
| 874 | |
| 875 | sbdev->laddr = *laddr; |
| 876 | sbdev->reported = true; |
| 877 | if (sbdev->dev.driver) { |
| 878 | sbdrv = to_slim_driver(sbdev->dev.driver); |
| 879 | if (sbdrv->device_up) |
| 880 | queue_work(ctrl->wq, &sbdev->wd); |
| 881 | } |
| 882 | break; |
| 883 | } |
| 884 | } |
| 885 | mutex_unlock(&ctrl->m_ctrl); |
| 886 | return 0; |
| 887 | } |
| 888 | EXPORT_SYMBOL(slim_assign_laddr); |
| 889 | |
| 890 | /* |
| 891 | * slim_get_logical_addr: Return the logical address of a slimbus device. |
| 892 | * @sb: client handle requesting the adddress. |
| 893 | * @e_addr: Elemental address of the device. |
| 894 | * @e_len: Length of e_addr |
| 895 | * @laddr: output buffer to store the address |
| 896 | * context: can sleep |
| 897 | * -EINVAL is returned in case of invalid parameters, and -ENXIO is returned if |
| 898 | * the device with this elemental address is not found. |
| 899 | */ |
| 900 | int slim_get_logical_addr(struct slim_device *sb, const u8 *e_addr, |
| 901 | u8 e_len, u8 *laddr) |
| 902 | { |
| 903 | int ret = 0; |
| 904 | u8 entry; |
| 905 | struct slim_controller *ctrl = sb->ctrl; |
| 906 | |
| 907 | if (!ctrl || !laddr || !e_addr || e_len != 6) |
| 908 | return -EINVAL; |
| 909 | mutex_lock(&ctrl->m_ctrl); |
| 910 | ret = ctrl_getlogical_addr(ctrl, e_addr, e_len, &entry); |
| 911 | if (!ret) |
| 912 | *laddr = ctrl->addrt[entry].laddr; |
| 913 | mutex_unlock(&ctrl->m_ctrl); |
| 914 | if (ret == -ENXIO && ctrl->get_laddr) { |
| 915 | ret = ctrl->get_laddr(ctrl, e_addr, e_len, laddr); |
| 916 | if (!ret) |
| 917 | ret = slim_assign_laddr(ctrl, e_addr, e_len, laddr, |
| 918 | true); |
| 919 | } |
| 920 | return ret; |
| 921 | } |
| 922 | EXPORT_SYMBOL(slim_get_logical_addr); |
| 923 | |
| 924 | static int slim_ele_access_sanity(struct slim_ele_access *msg, int oper, |
| 925 | u8 *rbuf, const u8 *wbuf, u8 len) |
| 926 | { |
| 927 | if (!msg || msg->num_bytes > 16 || msg->start_offset + len > 0xC00) |
| 928 | return -EINVAL; |
| 929 | switch (oper) { |
| 930 | case SLIM_MSG_MC_REQUEST_VALUE: |
| 931 | case SLIM_MSG_MC_REQUEST_INFORMATION: |
| 932 | if (rbuf == NULL) |
| 933 | return -EINVAL; |
| 934 | return 0; |
| 935 | case SLIM_MSG_MC_CHANGE_VALUE: |
| 936 | case SLIM_MSG_MC_CLEAR_INFORMATION: |
| 937 | if (wbuf == NULL) |
| 938 | return -EINVAL; |
| 939 | return 0; |
| 940 | case SLIM_MSG_MC_REQUEST_CHANGE_VALUE: |
| 941 | case SLIM_MSG_MC_REQUEST_CLEAR_INFORMATION: |
| 942 | if (rbuf == NULL || wbuf == NULL) |
| 943 | return -EINVAL; |
| 944 | return 0; |
| 945 | default: |
| 946 | return -EINVAL; |
| 947 | } |
| 948 | } |
| 949 | |
| 950 | static u16 slim_slicecodefromsize(u32 req) |
| 951 | { |
| 952 | u8 codetosize[8] = {1, 2, 3, 4, 6, 8, 12, 16}; |
| 953 | |
| 954 | if (req >= 8) |
| 955 | return 0; |
| 956 | else |
| 957 | return codetosize[req]; |
| 958 | } |
| 959 | |
| 960 | static u16 slim_slicesize(u32 code) |
| 961 | { |
| 962 | u8 sizetocode[16] = {0, 1, 2, 3, 3, 4, 4, 5, 5, 5, 5, 6, 6, 6, 6, 7}; |
| 963 | |
| 964 | if (code == 0) |
| 965 | code = 1; |
| 966 | if (code > 16) |
| 967 | code = 16; |
| 968 | return sizetocode[code - 1]; |
| 969 | } |
| 970 | |
| 971 | |
| 972 | /* Message APIs Unicast message APIs used by slimbus slave drivers */ |
| 973 | |
| 974 | /* |
| 975 | * Message API access routines. |
| 976 | * @sb: client handle requesting elemental message reads, writes. |
| 977 | * @msg: Input structure for start-offset, number of bytes to read. |
| 978 | * @rbuf: data buffer to be filled with values read. |
| 979 | * @len: data buffer size |
| 980 | * @wbuf: data buffer containing value/information to be written |
| 981 | * context: can sleep |
| 982 | * Returns: |
| 983 | * -EINVAL: Invalid parameters |
| 984 | * -ETIMEDOUT: If controller could not complete the request. This may happen if |
| 985 | * the bus lines are not clocked, controller is not powered-on, slave with |
| 986 | * given address is not enumerated/responding. |
| 987 | */ |
| 988 | int slim_request_val_element(struct slim_device *sb, |
| 989 | struct slim_ele_access *msg, u8 *buf, u8 len) |
| 990 | { |
| 991 | struct slim_controller *ctrl = sb->ctrl; |
| 992 | |
| 993 | if (!ctrl) |
| 994 | return -EINVAL; |
| 995 | return slim_xfer_msg(ctrl, sb, msg, SLIM_MSG_MC_REQUEST_VALUE, buf, |
| 996 | NULL, len); |
| 997 | } |
| 998 | EXPORT_SYMBOL(slim_request_val_element); |
| 999 | |
| 1000 | int slim_request_inf_element(struct slim_device *sb, |
| 1001 | struct slim_ele_access *msg, u8 *buf, u8 len) |
| 1002 | { |
| 1003 | struct slim_controller *ctrl = sb->ctrl; |
| 1004 | |
| 1005 | if (!ctrl) |
| 1006 | return -EINVAL; |
| 1007 | return slim_xfer_msg(ctrl, sb, msg, SLIM_MSG_MC_REQUEST_INFORMATION, |
| 1008 | buf, NULL, len); |
| 1009 | } |
| 1010 | EXPORT_SYMBOL(slim_request_inf_element); |
| 1011 | |
| 1012 | int slim_change_val_element(struct slim_device *sb, struct slim_ele_access *msg, |
| 1013 | const u8 *buf, u8 len) |
| 1014 | { |
| 1015 | struct slim_controller *ctrl = sb->ctrl; |
| 1016 | |
| 1017 | if (!ctrl) |
| 1018 | return -EINVAL; |
| 1019 | return slim_xfer_msg(ctrl, sb, msg, SLIM_MSG_MC_CHANGE_VALUE, NULL, buf, |
| 1020 | len); |
| 1021 | } |
| 1022 | EXPORT_SYMBOL(slim_change_val_element); |
| 1023 | |
| 1024 | int slim_clear_inf_element(struct slim_device *sb, struct slim_ele_access *msg, |
| 1025 | u8 *buf, u8 len) |
| 1026 | { |
| 1027 | struct slim_controller *ctrl = sb->ctrl; |
| 1028 | |
| 1029 | if (!ctrl) |
| 1030 | return -EINVAL; |
| 1031 | return slim_xfer_msg(ctrl, sb, msg, SLIM_MSG_MC_CLEAR_INFORMATION, NULL, |
| 1032 | buf, len); |
| 1033 | } |
| 1034 | EXPORT_SYMBOL(slim_clear_inf_element); |
| 1035 | |
| 1036 | int slim_request_change_val_element(struct slim_device *sb, |
| 1037 | struct slim_ele_access *msg, u8 *rbuf, |
| 1038 | const u8 *wbuf, u8 len) |
| 1039 | { |
| 1040 | struct slim_controller *ctrl = sb->ctrl; |
| 1041 | |
| 1042 | if (!ctrl) |
| 1043 | return -EINVAL; |
| 1044 | return slim_xfer_msg(ctrl, sb, msg, SLIM_MSG_MC_REQUEST_CHANGE_VALUE, |
| 1045 | rbuf, wbuf, len); |
| 1046 | } |
| 1047 | EXPORT_SYMBOL(slim_request_change_val_element); |
| 1048 | |
| 1049 | int slim_request_clear_inf_element(struct slim_device *sb, |
| 1050 | struct slim_ele_access *msg, u8 *rbuf, |
| 1051 | const u8 *wbuf, u8 len) |
| 1052 | { |
| 1053 | struct slim_controller *ctrl = sb->ctrl; |
| 1054 | |
| 1055 | if (!ctrl) |
| 1056 | return -EINVAL; |
| 1057 | return slim_xfer_msg(ctrl, sb, msg, |
| 1058 | SLIM_MSG_MC_REQUEST_CLEAR_INFORMATION, |
| 1059 | rbuf, wbuf, len); |
| 1060 | } |
| 1061 | EXPORT_SYMBOL(slim_request_clear_inf_element); |
| 1062 | |
| 1063 | /* |
| 1064 | * Broadcast message API: |
| 1065 | * call this API directly with sbdev = NULL. |
| 1066 | * For broadcast reads, make sure that buffers are big-enough to incorporate |
| 1067 | * replies from all logical addresses. |
| 1068 | * All controllers may not support broadcast |
| 1069 | */ |
| 1070 | int slim_xfer_msg(struct slim_controller *ctrl, struct slim_device *sbdev, |
| 1071 | struct slim_ele_access *msg, u16 mc, u8 *rbuf, |
| 1072 | const u8 *wbuf, u8 len) |
| 1073 | { |
| 1074 | DECLARE_COMPLETION_ONSTACK(complete); |
| 1075 | DEFINE_SLIM_LDEST_TXN(txn_stack, mc, len, 6, rbuf, wbuf, sbdev->laddr); |
| 1076 | struct slim_msg_txn *txn; |
| 1077 | int ret; |
| 1078 | u16 sl, cur; |
| 1079 | |
| 1080 | if (msg->comp && rbuf) { |
| 1081 | txn = kmalloc(sizeof(struct slim_msg_txn), |
| 1082 | GFP_KERNEL); |
| 1083 | if (IS_ERR_OR_NULL(txn)) |
| 1084 | return PTR_ERR(txn); |
| 1085 | *txn = txn_stack; |
| 1086 | txn->async = true; |
| 1087 | txn->comp = msg->comp; |
| 1088 | } else { |
| 1089 | txn = &txn_stack; |
| 1090 | if (rbuf) |
| 1091 | txn->comp = &complete; |
| 1092 | } |
| 1093 | |
| 1094 | ret = slim_ele_access_sanity(msg, mc, rbuf, wbuf, len); |
| 1095 | if (ret) |
| 1096 | goto xfer_err; |
| 1097 | |
| 1098 | sl = slim_slicesize(len); |
| 1099 | dev_dbg(&ctrl->dev, "SB xfer msg:os:%x, len:%d, MC:%x, sl:%x\n", |
| 1100 | msg->start_offset, len, mc, sl); |
| 1101 | |
| 1102 | cur = slim_slicecodefromsize(sl); |
| 1103 | txn->ec = ((sl | (1 << 3)) | ((msg->start_offset & 0xFFF) << 4)); |
| 1104 | |
| 1105 | if (wbuf) |
| 1106 | txn->rl += len; |
| 1107 | if (rbuf) { |
| 1108 | unsigned long flags; |
| 1109 | |
| 1110 | txn->rl++; |
| 1111 | ret = slim_processtxn(ctrl, txn, true); |
| 1112 | |
| 1113 | /* sync read */ |
| 1114 | if (!ret && !msg->comp) { |
| 1115 | ret = wait_for_completion_timeout(&complete, HZ); |
| 1116 | if (!ret) { |
| 1117 | dev_err(&ctrl->dev, "slimbus Read timed out"); |
| 1118 | spin_lock_irqsave(&ctrl->txn_lock, flags); |
| 1119 | /* Invalidate the transaction */ |
| 1120 | ctrl->txnt[txn->tid] = NULL; |
| 1121 | spin_unlock_irqrestore(&ctrl->txn_lock, flags); |
| 1122 | ret = -ETIMEDOUT; |
| 1123 | } else |
| 1124 | ret = 0; |
| 1125 | } else if (ret < 0 && !msg->comp) { |
| 1126 | dev_err(&ctrl->dev, "slimbus Read error"); |
| 1127 | spin_lock_irqsave(&ctrl->txn_lock, flags); |
| 1128 | /* Invalidate the transaction */ |
| 1129 | ctrl->txnt[txn->tid] = NULL; |
| 1130 | spin_unlock_irqrestore(&ctrl->txn_lock, flags); |
| 1131 | } |
| 1132 | |
| 1133 | } else |
| 1134 | ret = slim_processtxn(ctrl, txn, false); |
| 1135 | xfer_err: |
| 1136 | return ret; |
| 1137 | } |
| 1138 | EXPORT_SYMBOL(slim_xfer_msg); |
| 1139 | |
| 1140 | /* |
| 1141 | * User message: |
| 1142 | * slim_user_msg: Send user message that is interpreted by destination device |
| 1143 | * @sb: Client handle sending the message |
| 1144 | * @la: Destination device for this user message |
| 1145 | * @mt: Message Type (Soruce-referred, or Destination-referred) |
| 1146 | * @mc: Message Code |
| 1147 | * @msg: Message structure (start offset, number of bytes) to be sent |
| 1148 | * @buf: data buffer to be sent |
| 1149 | * @len: data buffer size in bytes |
| 1150 | */ |
| 1151 | int slim_user_msg(struct slim_device *sb, u8 la, u8 mt, u8 mc, |
| 1152 | struct slim_ele_access *msg, u8 *buf, u8 len) |
| 1153 | { |
| 1154 | if (!sb || !sb->ctrl || !msg || mt == SLIM_MSG_MT_CORE) |
| 1155 | return -EINVAL; |
| 1156 | if (!sb->ctrl->xfer_user_msg) |
| 1157 | return -EPROTONOSUPPORT; |
| 1158 | return sb->ctrl->xfer_user_msg(sb->ctrl, la, mt, mc, msg, buf, len); |
| 1159 | } |
| 1160 | EXPORT_SYMBOL(slim_user_msg); |
| 1161 | |
| 1162 | /* |
| 1163 | * Queue bulk of message writes: |
| 1164 | * slim_bulk_msg_write: Write bulk of messages (e.g. downloading FW) |
| 1165 | * @sb: Client handle sending these messages |
| 1166 | * @la: Destination device for these messages |
| 1167 | * @mt: Message Type |
| 1168 | * @mc: Message Code |
| 1169 | * @msgs: List of messages to be written in bulk |
| 1170 | * @n: Number of messages in the list |
| 1171 | * @cb: Callback if client needs this to be non-blocking |
| 1172 | * @ctx: Context for this callback |
| 1173 | * If supported by controller, this message list will be sent in bulk to the HW |
| 1174 | * If the client specifies this to be non-blocking, the callback will be |
| 1175 | * called from atomic context. |
| 1176 | */ |
| 1177 | int slim_bulk_msg_write(struct slim_device *sb, u8 mt, u8 mc, |
| 1178 | struct slim_val_inf msgs[], int n, |
| 1179 | int (*comp_cb)(void *ctx, int err), void *ctx) |
| 1180 | { |
Karthikeyan Ramasubramanian | f005ce7 | 2017-01-25 11:58:17 -0700 | [diff] [blame] | 1181 | int i, ret = 0; |
Sagar Dharia | be37c9c | 2016-11-28 23:06:58 -0700 | [diff] [blame] | 1182 | |
Karthikeyan Ramasubramanian | f005ce7 | 2017-01-25 11:58:17 -0700 | [diff] [blame] | 1183 | if (!sb || !sb->ctrl || !msgs || n <= 0) |
Sagar Dharia | be37c9c | 2016-11-28 23:06:58 -0700 | [diff] [blame] | 1184 | return -EINVAL; |
| 1185 | if (!sb->ctrl->xfer_bulk_wr) { |
| 1186 | pr_warn("controller does not support bulk WR, serializing"); |
| 1187 | for (i = 0; i < n; i++) { |
| 1188 | struct slim_ele_access ele; |
| 1189 | |
| 1190 | ele.comp = NULL; |
| 1191 | ele.start_offset = msgs[i].start_offset; |
| 1192 | ele.num_bytes = msgs[i].num_bytes; |
| 1193 | ret = slim_xfer_msg(sb->ctrl, sb, &ele, mc, |
| 1194 | msgs[i].rbuf, msgs[i].wbuf, |
| 1195 | ele.num_bytes); |
| 1196 | if (ret) |
| 1197 | return ret; |
| 1198 | } |
| 1199 | return ret; |
| 1200 | } |
| 1201 | return sb->ctrl->xfer_bulk_wr(sb->ctrl, sb->laddr, mt, mc, msgs, n, |
| 1202 | comp_cb, ctx); |
| 1203 | } |
| 1204 | EXPORT_SYMBOL(slim_bulk_msg_write); |
| 1205 | |
| 1206 | /* |
| 1207 | * slim_alloc_mgrports: Allocate port on manager side. |
| 1208 | * @sb: device/client handle. |
| 1209 | * @req: Port request type. |
| 1210 | * @nports: Number of ports requested |
| 1211 | * @rh: output buffer to store the port handles |
| 1212 | * @hsz: size of buffer storing handles |
| 1213 | * context: can sleep |
| 1214 | * This port will be typically used by SW. e.g. client driver wants to receive |
| 1215 | * some data from audio codec HW using a data channel. |
| 1216 | * Port allocated using this API will be used to receive the data. |
| 1217 | * If half-duplex ports are requested, two adjacent ports are allocated for |
| 1218 | * 1 half-duplex port. So the handle-buffer size should be twice the number |
| 1219 | * of half-duplex ports to be allocated. |
| 1220 | * -EDQUOT is returned if all ports are in use. |
| 1221 | */ |
| 1222 | int slim_alloc_mgrports(struct slim_device *sb, enum slim_port_req req, |
| 1223 | int nports, u32 *rh, int hsz) |
| 1224 | { |
| 1225 | int i, j; |
| 1226 | int ret = -EINVAL; |
| 1227 | int nphysp = nports; |
| 1228 | struct slim_controller *ctrl = sb->ctrl; |
| 1229 | |
| 1230 | if (!rh || !ctrl) |
| 1231 | return -EINVAL; |
| 1232 | if (req == SLIM_REQ_HALF_DUP) |
| 1233 | nphysp *= 2; |
| 1234 | if (hsz/sizeof(u32) < nphysp) |
| 1235 | return -EINVAL; |
| 1236 | mutex_lock(&ctrl->m_ctrl); |
| 1237 | |
| 1238 | for (i = 0; i < ctrl->nports; i++) { |
| 1239 | bool multiok = true; |
| 1240 | |
| 1241 | if (ctrl->ports[i].state != SLIM_P_FREE) |
| 1242 | continue; |
| 1243 | /* Start half duplex channel at even port */ |
| 1244 | if (req == SLIM_REQ_HALF_DUP && (i % 2)) |
| 1245 | continue; |
| 1246 | /* Allocate ports contiguously for multi-ch */ |
| 1247 | if (ctrl->nports < (i + nphysp)) { |
| 1248 | i = ctrl->nports; |
| 1249 | break; |
| 1250 | } |
| 1251 | if (req == SLIM_REQ_MULTI_CH) { |
| 1252 | multiok = true; |
| 1253 | for (j = i; j < i + nphysp; j++) { |
| 1254 | if (ctrl->ports[j].state != SLIM_P_FREE) { |
| 1255 | multiok = false; |
| 1256 | break; |
| 1257 | } |
| 1258 | } |
| 1259 | if (!multiok) |
| 1260 | continue; |
| 1261 | } |
| 1262 | break; |
| 1263 | } |
| 1264 | if (i >= ctrl->nports) { |
| 1265 | ret = -EDQUOT; |
| 1266 | goto alloc_err; |
| 1267 | } |
| 1268 | ret = 0; |
| 1269 | for (j = i; j < i + nphysp; j++) { |
| 1270 | ctrl->ports[j].state = SLIM_P_UNCFG; |
| 1271 | ctrl->ports[j].req = req; |
| 1272 | if (req == SLIM_REQ_HALF_DUP && (j % 2)) |
| 1273 | ctrl->ports[j].flow = SLIM_SINK; |
| 1274 | else |
| 1275 | ctrl->ports[j].flow = SLIM_SRC; |
| 1276 | if (ctrl->alloc_port) |
| 1277 | ret = ctrl->alloc_port(ctrl, j); |
| 1278 | if (ret) { |
| 1279 | for (; j >= i; j--) |
| 1280 | ctrl->ports[j].state = SLIM_P_FREE; |
| 1281 | goto alloc_err; |
| 1282 | } |
| 1283 | *rh++ = SLIM_PORT_HDL(SLIM_LA_MANAGER, 0, j); |
| 1284 | } |
| 1285 | alloc_err: |
| 1286 | mutex_unlock(&ctrl->m_ctrl); |
| 1287 | return ret; |
| 1288 | } |
| 1289 | EXPORT_SYMBOL(slim_alloc_mgrports); |
| 1290 | |
| 1291 | /* Deallocate the port(s) allocated using the API above */ |
| 1292 | int slim_dealloc_mgrports(struct slim_device *sb, u32 *hdl, int nports) |
| 1293 | { |
| 1294 | int i; |
| 1295 | struct slim_controller *ctrl = sb->ctrl; |
| 1296 | |
| 1297 | if (!ctrl || !hdl) |
| 1298 | return -EINVAL; |
| 1299 | |
| 1300 | mutex_lock(&ctrl->m_ctrl); |
| 1301 | |
| 1302 | for (i = 0; i < nports; i++) { |
| 1303 | u8 pn; |
| 1304 | |
| 1305 | pn = SLIM_HDL_TO_PORT(hdl[i]); |
| 1306 | |
| 1307 | if (pn >= ctrl->nports || ctrl->ports[pn].state == SLIM_P_CFG) { |
| 1308 | int j, ret; |
| 1309 | |
| 1310 | if (pn >= ctrl->nports) { |
| 1311 | dev_err(&ctrl->dev, "invalid port number"); |
| 1312 | ret = -EINVAL; |
| 1313 | } else { |
| 1314 | dev_err(&ctrl->dev, |
| 1315 | "Can't dealloc connected port:%d", i); |
| 1316 | ret = -EISCONN; |
| 1317 | } |
| 1318 | for (j = i - 1; j >= 0; j--) { |
| 1319 | pn = SLIM_HDL_TO_PORT(hdl[j]); |
| 1320 | ctrl->ports[pn].state = SLIM_P_UNCFG; |
| 1321 | } |
| 1322 | mutex_unlock(&ctrl->m_ctrl); |
| 1323 | return ret; |
| 1324 | } |
| 1325 | if (ctrl->dealloc_port) |
| 1326 | ctrl->dealloc_port(ctrl, pn); |
| 1327 | ctrl->ports[pn].state = SLIM_P_FREE; |
| 1328 | } |
| 1329 | mutex_unlock(&ctrl->m_ctrl); |
| 1330 | return 0; |
| 1331 | } |
| 1332 | EXPORT_SYMBOL(slim_dealloc_mgrports); |
| 1333 | |
| 1334 | /* |
| 1335 | * slim_config_mgrports: Configure manager side ports |
| 1336 | * @sb: device/client handle. |
| 1337 | * @ph: array of port handles for which this configuration is valid |
| 1338 | * @nports: Number of ports in ph |
| 1339 | * @cfg: configuration requested for port(s) |
| 1340 | * Configure port settings if they are different than the default ones. |
| 1341 | * Returns success if the config could be applied. Returns -EISCONN if the |
| 1342 | * port is in use |
| 1343 | */ |
| 1344 | int slim_config_mgrports(struct slim_device *sb, u32 *ph, int nports, |
| 1345 | struct slim_port_cfg *cfg) |
| 1346 | { |
| 1347 | int i; |
| 1348 | struct slim_controller *ctrl; |
| 1349 | |
| 1350 | if (!sb || !ph || !nports || !sb->ctrl || !cfg) |
| 1351 | return -EINVAL; |
| 1352 | |
| 1353 | ctrl = sb->ctrl; |
| 1354 | mutex_lock(&ctrl->sched.m_reconf); |
| 1355 | for (i = 0; i < nports; i++) { |
| 1356 | u8 pn = SLIM_HDL_TO_PORT(ph[i]); |
| 1357 | |
| 1358 | if (ctrl->ports[pn].state == SLIM_P_CFG) |
| 1359 | return -EISCONN; |
| 1360 | ctrl->ports[pn].cfg = *cfg; |
| 1361 | } |
| 1362 | mutex_unlock(&ctrl->sched.m_reconf); |
| 1363 | return 0; |
| 1364 | } |
| 1365 | EXPORT_SYMBOL(slim_config_mgrports); |
| 1366 | |
| 1367 | /* |
| 1368 | * slim_get_slaveport: Get slave port handle |
| 1369 | * @la: slave device logical address. |
| 1370 | * @idx: port index at slave |
| 1371 | * @rh: return handle |
| 1372 | * @flw: Flow type (source or destination) |
| 1373 | * This API only returns a slave port's representation as expected by slimbus |
| 1374 | * driver. This port is not managed by the slimbus driver. Caller is expected |
| 1375 | * to have visibility of this port since it's a device-port. |
| 1376 | */ |
| 1377 | int slim_get_slaveport(u8 la, int idx, u32 *rh, enum slim_port_flow flw) |
| 1378 | { |
| 1379 | if (rh == NULL) |
| 1380 | return -EINVAL; |
| 1381 | *rh = SLIM_PORT_HDL(la, flw, idx); |
| 1382 | return 0; |
| 1383 | } |
| 1384 | EXPORT_SYMBOL(slim_get_slaveport); |
| 1385 | |
| 1386 | static int connect_port_ch(struct slim_controller *ctrl, u8 ch, u32 ph, |
| 1387 | enum slim_port_flow flow) |
| 1388 | { |
| 1389 | int ret; |
| 1390 | u8 buf[2]; |
| 1391 | u32 la = SLIM_HDL_TO_LA(ph); |
| 1392 | u8 pn = (u8)SLIM_HDL_TO_PORT(ph); |
| 1393 | DEFINE_SLIM_LDEST_TXN(txn, 0, 2, 6, NULL, buf, la); |
| 1394 | |
| 1395 | if (flow == SLIM_SRC) |
| 1396 | txn.mc = SLIM_MSG_MC_CONNECT_SOURCE; |
| 1397 | else |
| 1398 | txn.mc = SLIM_MSG_MC_CONNECT_SINK; |
| 1399 | buf[0] = pn; |
| 1400 | buf[1] = ctrl->chans[ch].chan; |
Karthikeyan Ramasubramanian | 170679c | 2017-02-27 15:11:56 -0700 | [diff] [blame] | 1401 | if (la == SLIM_LA_MANAGER) { |
Sagar Dharia | be37c9c | 2016-11-28 23:06:58 -0700 | [diff] [blame] | 1402 | ctrl->ports[pn].flow = flow; |
Karthikeyan Ramasubramanian | 170679c | 2017-02-27 15:11:56 -0700 | [diff] [blame] | 1403 | ctrl->ports[pn].ch = &ctrl->chans[ch].prop; |
| 1404 | } |
Sagar Dharia | be37c9c | 2016-11-28 23:06:58 -0700 | [diff] [blame] | 1405 | ret = slim_processtxn(ctrl, &txn, false); |
| 1406 | if (!ret && la == SLIM_LA_MANAGER) |
| 1407 | ctrl->ports[pn].state = SLIM_P_CFG; |
| 1408 | return ret; |
| 1409 | } |
| 1410 | |
| 1411 | static int disconnect_port_ch(struct slim_controller *ctrl, u32 ph) |
| 1412 | { |
| 1413 | int ret; |
| 1414 | u32 la = SLIM_HDL_TO_LA(ph); |
| 1415 | u8 pn = (u8)SLIM_HDL_TO_PORT(ph); |
| 1416 | DEFINE_SLIM_LDEST_TXN(txn, 0, 1, 5, NULL, &pn, la); |
| 1417 | |
| 1418 | txn.mc = SLIM_MSG_MC_DISCONNECT_PORT; |
| 1419 | ret = slim_processtxn(ctrl, &txn, false); |
| 1420 | if (ret) |
| 1421 | return ret; |
| 1422 | if (la == SLIM_LA_MANAGER) { |
| 1423 | ctrl->ports[pn].state = SLIM_P_UNCFG; |
| 1424 | ctrl->ports[pn].cfg.watermark = 0; |
| 1425 | ctrl->ports[pn].cfg.port_opts = 0; |
| 1426 | ctrl->ports[pn].ch = NULL; |
| 1427 | } |
| 1428 | return 0; |
| 1429 | } |
| 1430 | |
| 1431 | /* |
| 1432 | * slim_connect_src: Connect source port to channel. |
| 1433 | * @sb: client handle |
| 1434 | * @srch: source handle to be connected to this channel |
| 1435 | * @chanh: Channel with which the ports need to be associated with. |
| 1436 | * Per slimbus specification, a channel may have 1 source port. |
| 1437 | * Channel specified in chanh needs to be allocated first. |
| 1438 | * Returns -EALREADY if source is already configured for this channel. |
| 1439 | * Returns -ENOTCONN if channel is not allocated |
| 1440 | * Returns -EINVAL if invalid direction is specified for non-manager port, |
| 1441 | * or if the manager side port number is out of bounds, or in incorrect state |
| 1442 | */ |
| 1443 | int slim_connect_src(struct slim_device *sb, u32 srch, u16 chanh) |
| 1444 | { |
| 1445 | struct slim_controller *ctrl = sb->ctrl; |
| 1446 | int ret; |
| 1447 | u8 chan = SLIM_HDL_TO_CHIDX(chanh); |
| 1448 | struct slim_ich *slc = &ctrl->chans[chan]; |
| 1449 | enum slim_port_flow flow = SLIM_HDL_TO_FLOW(srch); |
| 1450 | u8 la = SLIM_HDL_TO_LA(srch); |
| 1451 | u8 pn = SLIM_HDL_TO_PORT(srch); |
| 1452 | |
| 1453 | /* manager ports don't have direction when they are allocated */ |
| 1454 | if (la != SLIM_LA_MANAGER && flow != SLIM_SRC) |
| 1455 | return -EINVAL; |
| 1456 | |
| 1457 | mutex_lock(&ctrl->sched.m_reconf); |
| 1458 | |
| 1459 | if (la == SLIM_LA_MANAGER) { |
| 1460 | if (pn >= ctrl->nports || |
| 1461 | ctrl->ports[pn].state != SLIM_P_UNCFG) { |
| 1462 | ret = -EINVAL; |
| 1463 | goto connect_src_err; |
| 1464 | } |
| 1465 | } |
| 1466 | |
| 1467 | if (slc->state == SLIM_CH_FREE) { |
| 1468 | ret = -ENOTCONN; |
| 1469 | goto connect_src_err; |
| 1470 | } |
| 1471 | /* |
| 1472 | * Once channel is removed, its ports can be considered disconnected |
| 1473 | * So its ports can be reassigned. Source port is zeroed |
| 1474 | * when channel is deallocated. |
| 1475 | */ |
| 1476 | if (slc->srch) { |
| 1477 | ret = -EALREADY; |
| 1478 | goto connect_src_err; |
| 1479 | } |
Sagar Dharia | be37c9c | 2016-11-28 23:06:58 -0700 | [diff] [blame] | 1480 | ret = connect_port_ch(ctrl, chan, srch, SLIM_SRC); |
| 1481 | |
| 1482 | if (!ret) |
| 1483 | slc->srch = srch; |
| 1484 | |
| 1485 | connect_src_err: |
| 1486 | mutex_unlock(&ctrl->sched.m_reconf); |
| 1487 | return ret; |
| 1488 | } |
| 1489 | EXPORT_SYMBOL(slim_connect_src); |
| 1490 | |
| 1491 | /* |
| 1492 | * slim_connect_sink: Connect sink port(s) to channel. |
| 1493 | * @sb: client handle |
| 1494 | * @sinkh: sink handle(s) to be connected to this channel |
| 1495 | * @nsink: number of sinks |
| 1496 | * @chanh: Channel with which the ports need to be associated with. |
| 1497 | * Per slimbus specification, a channel may have multiple sink-ports. |
| 1498 | * Channel specified in chanh needs to be allocated first. |
| 1499 | * Returns -EALREADY if sink is already configured for this channel. |
| 1500 | * Returns -ENOTCONN if channel is not allocated |
| 1501 | * Returns -EINVAL if invalid parameters are passed, or invalid direction is |
| 1502 | * specified for non-manager port, or if the manager side port number is out of |
| 1503 | * bounds, or in incorrect state |
| 1504 | */ |
| 1505 | int slim_connect_sink(struct slim_device *sb, u32 *sinkh, int nsink, u16 chanh) |
| 1506 | { |
| 1507 | struct slim_controller *ctrl = sb->ctrl; |
| 1508 | int j; |
| 1509 | int ret = 0; |
| 1510 | u8 chan = SLIM_HDL_TO_CHIDX(chanh); |
| 1511 | struct slim_ich *slc = &ctrl->chans[chan]; |
| 1512 | void *new_sinkh = NULL; |
| 1513 | |
| 1514 | if (!sinkh || !nsink) |
| 1515 | return -EINVAL; |
| 1516 | |
| 1517 | mutex_lock(&ctrl->sched.m_reconf); |
| 1518 | |
| 1519 | /* |
| 1520 | * Once channel is removed, its ports can be considered disconnected |
| 1521 | * So its ports can be reassigned. Sink ports are freed when channel |
| 1522 | * is deallocated. |
| 1523 | */ |
| 1524 | if (slc->state == SLIM_CH_FREE) { |
| 1525 | ret = -ENOTCONN; |
| 1526 | goto connect_sink_err; |
| 1527 | } |
| 1528 | |
| 1529 | for (j = 0; j < nsink; j++) { |
| 1530 | enum slim_port_flow flow = SLIM_HDL_TO_FLOW(sinkh[j]); |
| 1531 | u8 la = SLIM_HDL_TO_LA(sinkh[j]); |
| 1532 | u8 pn = SLIM_HDL_TO_PORT(sinkh[j]); |
| 1533 | |
Karthikeyan Ramasubramanian | 170679c | 2017-02-27 15:11:56 -0700 | [diff] [blame] | 1534 | if (la != SLIM_LA_MANAGER && flow != SLIM_SINK) |
Sagar Dharia | be37c9c | 2016-11-28 23:06:58 -0700 | [diff] [blame] | 1535 | ret = -EINVAL; |
Karthikeyan Ramasubramanian | 170679c | 2017-02-27 15:11:56 -0700 | [diff] [blame] | 1536 | else if (la == SLIM_LA_MANAGER && |
Sagar Dharia | be37c9c | 2016-11-28 23:06:58 -0700 | [diff] [blame] | 1537 | (pn >= ctrl->nports || |
Karthikeyan Ramasubramanian | 170679c | 2017-02-27 15:11:56 -0700 | [diff] [blame] | 1538 | ctrl->ports[pn].state != SLIM_P_UNCFG)) |
Sagar Dharia | be37c9c | 2016-11-28 23:06:58 -0700 | [diff] [blame] | 1539 | ret = -EINVAL; |
Karthikeyan Ramasubramanian | 170679c | 2017-02-27 15:11:56 -0700 | [diff] [blame] | 1540 | else |
Sagar Dharia | be37c9c | 2016-11-28 23:06:58 -0700 | [diff] [blame] | 1541 | ret = connect_port_ch(ctrl, chan, sinkh[j], SLIM_SINK); |
Karthikeyan Ramasubramanian | 170679c | 2017-02-27 15:11:56 -0700 | [diff] [blame] | 1542 | |
Sagar Dharia | be37c9c | 2016-11-28 23:06:58 -0700 | [diff] [blame] | 1543 | if (ret) { |
| 1544 | for (j = j - 1; j >= 0; j--) |
| 1545 | disconnect_port_ch(ctrl, sinkh[j]); |
| 1546 | goto connect_sink_err; |
| 1547 | } |
| 1548 | } |
| 1549 | |
| 1550 | new_sinkh = krealloc(slc->sinkh, (sizeof(u32) * (slc->nsink + nsink)), |
| 1551 | GFP_KERNEL); |
| 1552 | if (!new_sinkh) { |
| 1553 | ret = -ENOMEM; |
| 1554 | for (j = 0; j < nsink; j++) |
| 1555 | disconnect_port_ch(ctrl, sinkh[j]); |
| 1556 | goto connect_sink_err; |
| 1557 | } |
| 1558 | |
| 1559 | slc->sinkh = new_sinkh; |
| 1560 | memcpy(slc->sinkh + slc->nsink, sinkh, (sizeof(u32) * nsink)); |
| 1561 | slc->nsink += nsink; |
| 1562 | |
| 1563 | connect_sink_err: |
| 1564 | mutex_unlock(&ctrl->sched.m_reconf); |
| 1565 | return ret; |
| 1566 | } |
| 1567 | EXPORT_SYMBOL(slim_connect_sink); |
| 1568 | |
| 1569 | /* |
| 1570 | * slim_disconnect_ports: Disconnect port(s) from channel |
| 1571 | * @sb: client handle |
| 1572 | * @ph: ports to be disconnected |
| 1573 | * @nph: number of ports. |
| 1574 | * Disconnects ports from a channel. |
| 1575 | */ |
| 1576 | int slim_disconnect_ports(struct slim_device *sb, u32 *ph, int nph) |
| 1577 | { |
| 1578 | struct slim_controller *ctrl = sb->ctrl; |
| 1579 | int i; |
| 1580 | |
| 1581 | mutex_lock(&ctrl->sched.m_reconf); |
| 1582 | |
| 1583 | for (i = 0; i < nph; i++) |
| 1584 | disconnect_port_ch(ctrl, ph[i]); |
| 1585 | mutex_unlock(&ctrl->sched.m_reconf); |
| 1586 | return 0; |
| 1587 | } |
| 1588 | EXPORT_SYMBOL(slim_disconnect_ports); |
| 1589 | |
| 1590 | /* |
| 1591 | * slim_port_xfer: Schedule buffer to be transferred/received using port-handle. |
| 1592 | * @sb: client handle |
| 1593 | * @ph: port-handle |
| 1594 | * @iobuf: buffer to be transferred or populated |
| 1595 | * @len: buffer size. |
| 1596 | * @comp: completion signal to indicate transfer done or error. |
| 1597 | * context: can sleep |
| 1598 | * Returns number of bytes transferred/received if used synchronously. |
| 1599 | * Will return 0 if used asynchronously. |
| 1600 | * Client will call slim_port_get_xfer_status to get error and/or number of |
| 1601 | * bytes transferred if used asynchronously. |
| 1602 | */ |
Dilip Kota | 81c8855 | 2017-10-24 12:18:23 +0530 | [diff] [blame] | 1603 | int slim_port_xfer(struct slim_device *sb, u32 ph, void *buf, u32 len, |
Sagar Dharia | be37c9c | 2016-11-28 23:06:58 -0700 | [diff] [blame] | 1604 | struct completion *comp) |
| 1605 | { |
| 1606 | struct slim_controller *ctrl = sb->ctrl; |
| 1607 | u8 pn = SLIM_HDL_TO_PORT(ph); |
| 1608 | |
| 1609 | dev_dbg(&ctrl->dev, "port xfer: num:%d", pn); |
Dilip Kota | 81c8855 | 2017-10-24 12:18:23 +0530 | [diff] [blame] | 1610 | return ctrl->port_xfer(ctrl, pn, buf, len, comp); |
Sagar Dharia | be37c9c | 2016-11-28 23:06:58 -0700 | [diff] [blame] | 1611 | } |
| 1612 | EXPORT_SYMBOL(slim_port_xfer); |
| 1613 | |
| 1614 | /* |
| 1615 | * slim_port_get_xfer_status: Poll for port transfers, or get transfer status |
| 1616 | * after completion is done. |
| 1617 | * @sb: client handle |
| 1618 | * @ph: port-handle |
| 1619 | * @done_buf: return pointer (iobuf from slim_port_xfer) which is processed. |
| 1620 | * @done_len: Number of bytes transferred. |
| 1621 | * This can be called when port_xfer complition is signalled. |
| 1622 | * The API will return port transfer error (underflow/overflow/disconnect) |
| 1623 | * and/or done_len will reflect number of bytes transferred. Note that |
| 1624 | * done_len may be valid even if port error (overflow/underflow) has happened. |
| 1625 | * e.g. If the transfer was scheduled with a few bytes to be transferred and |
| 1626 | * client has not supplied more data to be transferred, done_len will indicate |
| 1627 | * number of bytes transferred with underflow error. To avoid frequent underflow |
| 1628 | * errors, multiple transfers can be queued (e.g. ping-pong buffers) so that |
| 1629 | * channel has data to be transferred even if client is not ready to transfer |
| 1630 | * data all the time. done_buf will indicate address of the last buffer |
| 1631 | * processed from the multiple transfers. |
| 1632 | */ |
| 1633 | enum slim_port_err slim_port_get_xfer_status(struct slim_device *sb, u32 ph, |
| 1634 | phys_addr_t *done_buf, u32 *done_len) |
| 1635 | { |
| 1636 | struct slim_controller *ctrl = sb->ctrl; |
| 1637 | u8 pn = SLIM_HDL_TO_PORT(ph); |
| 1638 | u32 la = SLIM_HDL_TO_LA(ph); |
| 1639 | enum slim_port_err err; |
| 1640 | |
| 1641 | dev_dbg(&ctrl->dev, "get status port num:%d", pn); |
| 1642 | /* |
| 1643 | * Framework only has insight into ports managed by ported device |
| 1644 | * used by the manager and not slave |
| 1645 | */ |
| 1646 | if (la != SLIM_LA_MANAGER) { |
| 1647 | if (done_buf) |
| 1648 | *done_buf = 0; |
| 1649 | if (done_len) |
| 1650 | *done_len = 0; |
| 1651 | return SLIM_P_NOT_OWNED; |
| 1652 | } |
| 1653 | err = ctrl->port_xfer_status(ctrl, pn, done_buf, done_len); |
| 1654 | if (err == SLIM_P_INPROGRESS) |
| 1655 | err = ctrl->ports[pn].err; |
| 1656 | return err; |
| 1657 | } |
| 1658 | EXPORT_SYMBOL(slim_port_get_xfer_status); |
| 1659 | |
| 1660 | static void slim_add_ch(struct slim_controller *ctrl, struct slim_ich *slc) |
| 1661 | { |
| 1662 | struct slim_ich **arr; |
| 1663 | int i, j; |
| 1664 | int *len; |
| 1665 | int sl = slc->seglen << slc->rootexp; |
| 1666 | /* Channel is already active and other end is transmitting data */ |
| 1667 | if (slc->state >= SLIM_CH_ACTIVE) |
| 1668 | return; |
| 1669 | if (slc->coeff == SLIM_COEFF_1) { |
| 1670 | arr = ctrl->sched.chc1; |
| 1671 | len = &ctrl->sched.num_cc1; |
| 1672 | } else { |
| 1673 | arr = ctrl->sched.chc3; |
| 1674 | len = &ctrl->sched.num_cc3; |
| 1675 | sl *= 3; |
| 1676 | } |
| 1677 | |
| 1678 | *len += 1; |
| 1679 | |
| 1680 | /* Insert the channel based on rootexp and seglen */ |
| 1681 | for (i = 0; i < *len - 1; i++) { |
| 1682 | /* |
| 1683 | * Primary key: exp low to high. |
| 1684 | * Secondary key: seglen: high to low |
| 1685 | */ |
| 1686 | if ((slc->rootexp > arr[i]->rootexp) || |
| 1687 | ((slc->rootexp == arr[i]->rootexp) && |
| 1688 | (slc->seglen < arr[i]->seglen))) |
| 1689 | continue; |
| 1690 | else |
| 1691 | break; |
| 1692 | } |
| 1693 | for (j = *len - 1; j > i; j--) |
| 1694 | arr[j] = arr[j - 1]; |
| 1695 | arr[i] = slc; |
| 1696 | if (!ctrl->allocbw) |
| 1697 | ctrl->sched.usedslots += sl; |
| 1698 | } |
| 1699 | |
| 1700 | static int slim_remove_ch(struct slim_controller *ctrl, struct slim_ich *slc) |
| 1701 | { |
| 1702 | struct slim_ich **arr; |
| 1703 | int i; |
| 1704 | u32 la, ph; |
| 1705 | int *len; |
| 1706 | |
| 1707 | if (slc->coeff == SLIM_COEFF_1) { |
| 1708 | arr = ctrl->sched.chc1; |
| 1709 | len = &ctrl->sched.num_cc1; |
| 1710 | } else { |
| 1711 | arr = ctrl->sched.chc3; |
| 1712 | len = &ctrl->sched.num_cc3; |
| 1713 | } |
| 1714 | |
| 1715 | for (i = 0; i < *len; i++) { |
| 1716 | if (arr[i] == slc) |
| 1717 | break; |
| 1718 | } |
| 1719 | if (i >= *len) |
| 1720 | return -EXFULL; |
| 1721 | for (; i < *len - 1; i++) |
| 1722 | arr[i] = arr[i + 1]; |
| 1723 | *len -= 1; |
| 1724 | arr[*len] = NULL; |
| 1725 | |
| 1726 | slc->state = SLIM_CH_ALLOCATED; |
| 1727 | slc->def = 0; |
| 1728 | slc->newintr = 0; |
| 1729 | slc->newoff = 0; |
| 1730 | for (i = 0; i < slc->nsink; i++) { |
| 1731 | ph = slc->sinkh[i]; |
| 1732 | la = SLIM_HDL_TO_LA(ph); |
| 1733 | /* |
| 1734 | * For ports managed by manager's ported device, no need to send |
| 1735 | * disconnect. It is client's responsibility to call disconnect |
| 1736 | * on ports owned by the slave device |
| 1737 | */ |
| 1738 | if (la == SLIM_LA_MANAGER) { |
| 1739 | ctrl->ports[SLIM_HDL_TO_PORT(ph)].state = SLIM_P_UNCFG; |
| 1740 | ctrl->ports[SLIM_HDL_TO_PORT(ph)].ch = NULL; |
| 1741 | } |
| 1742 | } |
| 1743 | |
| 1744 | ph = slc->srch; |
| 1745 | la = SLIM_HDL_TO_LA(ph); |
| 1746 | if (la == SLIM_LA_MANAGER) { |
| 1747 | u8 pn = SLIM_HDL_TO_PORT(ph); |
| 1748 | |
| 1749 | ctrl->ports[pn].state = SLIM_P_UNCFG; |
| 1750 | ctrl->ports[pn].cfg.watermark = 0; |
| 1751 | ctrl->ports[pn].cfg.port_opts = 0; |
| 1752 | } |
| 1753 | |
| 1754 | kfree(slc->sinkh); |
| 1755 | slc->sinkh = NULL; |
| 1756 | slc->srch = 0; |
| 1757 | slc->nsink = 0; |
| 1758 | return 0; |
| 1759 | } |
| 1760 | |
| 1761 | static u32 slim_calc_prrate(struct slim_controller *ctrl, struct slim_ch *prop) |
| 1762 | { |
| 1763 | u32 rate = 0, rate4k = 0, rate11k = 0; |
| 1764 | u32 exp = 0; |
| 1765 | u32 pr = 0; |
| 1766 | bool exact = true; |
| 1767 | bool done = false; |
| 1768 | enum slim_ch_rate ratefam; |
| 1769 | |
| 1770 | if (prop->prot >= SLIM_ASYNC_SMPLX) |
| 1771 | return 0; |
| 1772 | if (prop->baser == SLIM_RATE_1HZ) { |
| 1773 | rate = prop->ratem / 4000; |
| 1774 | rate4k = rate; |
| 1775 | if (rate * 4000 == prop->ratem) |
| 1776 | ratefam = SLIM_RATE_4000HZ; |
| 1777 | else { |
| 1778 | rate = prop->ratem / 11025; |
| 1779 | rate11k = rate; |
| 1780 | if (rate * 11025 == prop->ratem) |
| 1781 | ratefam = SLIM_RATE_11025HZ; |
| 1782 | else |
| 1783 | ratefam = SLIM_RATE_1HZ; |
| 1784 | } |
| 1785 | } else { |
| 1786 | ratefam = prop->baser; |
| 1787 | rate = prop->ratem; |
| 1788 | } |
| 1789 | if (ratefam == SLIM_RATE_1HZ) { |
| 1790 | exact = false; |
| 1791 | if ((rate4k + 1) * 4000 < (rate11k + 1) * 11025) { |
| 1792 | rate = rate4k + 1; |
| 1793 | ratefam = SLIM_RATE_4000HZ; |
| 1794 | } else { |
| 1795 | rate = rate11k + 1; |
| 1796 | ratefam = SLIM_RATE_11025HZ; |
| 1797 | } |
| 1798 | } |
| 1799 | /* covert rate to coeff-exp */ |
| 1800 | while (!done) { |
| 1801 | while ((rate & 0x1) != 0x1) { |
| 1802 | rate >>= 1; |
| 1803 | exp++; |
| 1804 | } |
| 1805 | if (rate > 3) { |
| 1806 | /* roundup if not exact */ |
| 1807 | rate++; |
| 1808 | exact = false; |
| 1809 | } else |
| 1810 | done = true; |
| 1811 | } |
| 1812 | if (ratefam == SLIM_RATE_4000HZ) { |
| 1813 | if (rate == 1) |
| 1814 | pr = 0x10; |
| 1815 | else { |
| 1816 | pr = 0; |
| 1817 | exp++; |
| 1818 | } |
| 1819 | } else { |
| 1820 | pr = 8; |
| 1821 | exp++; |
| 1822 | } |
| 1823 | if (exp <= 7) { |
| 1824 | pr |= exp; |
| 1825 | if (exact) |
| 1826 | pr |= 0x80; |
| 1827 | } else |
| 1828 | pr = 0; |
| 1829 | return pr; |
| 1830 | } |
| 1831 | |
| 1832 | static int slim_nextdefine_ch(struct slim_device *sb, u8 chan) |
| 1833 | { |
| 1834 | struct slim_controller *ctrl = sb->ctrl; |
| 1835 | u32 chrate = 0; |
| 1836 | u32 exp = 0; |
| 1837 | u32 coeff = 0; |
| 1838 | bool exact = true; |
| 1839 | bool done = false; |
| 1840 | int ret = 0; |
| 1841 | struct slim_ich *slc = &ctrl->chans[chan]; |
| 1842 | struct slim_ch *prop = &slc->prop; |
| 1843 | |
| 1844 | slc->prrate = slim_calc_prrate(ctrl, prop); |
| 1845 | dev_dbg(&ctrl->dev, "ch:%d, chan PR rate:%x\n", chan, slc->prrate); |
| 1846 | if (prop->baser == SLIM_RATE_4000HZ) |
| 1847 | chrate = 4000 * prop->ratem; |
| 1848 | else if (prop->baser == SLIM_RATE_11025HZ) |
| 1849 | chrate = 11025 * prop->ratem; |
| 1850 | else |
| 1851 | chrate = prop->ratem; |
| 1852 | /* max allowed sample freq = 768 seg/frame */ |
| 1853 | if (chrate > 3600000) |
| 1854 | return -EDQUOT; |
| 1855 | if (prop->baser == SLIM_RATE_4000HZ && |
| 1856 | ctrl->a_framer->superfreq == 4000) |
| 1857 | coeff = prop->ratem; |
| 1858 | else if (prop->baser == SLIM_RATE_11025HZ && |
| 1859 | ctrl->a_framer->superfreq == 3675) |
| 1860 | coeff = 3 * prop->ratem; |
| 1861 | else { |
| 1862 | u32 tempr = 0; |
| 1863 | |
| 1864 | tempr = chrate * SLIM_CL_PER_SUPERFRAME_DIV8; |
| 1865 | coeff = tempr / ctrl->a_framer->rootfreq; |
| 1866 | if (coeff * ctrl->a_framer->rootfreq != tempr) { |
| 1867 | coeff++; |
| 1868 | exact = false; |
| 1869 | } |
| 1870 | } |
| 1871 | |
| 1872 | /* convert coeff to coeff-exponent */ |
| 1873 | exp = 0; |
| 1874 | while (!done) { |
| 1875 | while ((coeff & 0x1) != 0x1) { |
| 1876 | coeff >>= 1; |
| 1877 | exp++; |
| 1878 | } |
| 1879 | if (coeff > 3) { |
| 1880 | coeff++; |
| 1881 | exact = false; |
| 1882 | } else |
| 1883 | done = true; |
| 1884 | } |
| 1885 | if (prop->prot == SLIM_HARD_ISO && !exact) |
| 1886 | return -EPROTONOSUPPORT; |
| 1887 | else if (prop->prot == SLIM_AUTO_ISO) { |
| 1888 | if (exact) |
| 1889 | prop->prot = SLIM_HARD_ISO; |
| 1890 | else |
| 1891 | prop->prot = SLIM_PUSH; |
| 1892 | } |
| 1893 | slc->rootexp = exp; |
| 1894 | slc->seglen = prop->sampleszbits/SLIM_CL_PER_SL; |
| 1895 | if (prop->prot != SLIM_HARD_ISO) |
| 1896 | slc->seglen++; |
| 1897 | if (prop->prot >= SLIM_EXT_SMPLX) |
| 1898 | slc->seglen++; |
| 1899 | /* convert coeff to enum */ |
| 1900 | if (coeff == 1) { |
| 1901 | if (exp > 9) |
| 1902 | ret = -EIO; |
| 1903 | coeff = SLIM_COEFF_1; |
| 1904 | } else { |
| 1905 | if (exp > 8) |
| 1906 | ret = -EIO; |
| 1907 | coeff = SLIM_COEFF_3; |
| 1908 | } |
| 1909 | slc->coeff = coeff; |
| 1910 | |
| 1911 | return ret; |
| 1912 | } |
| 1913 | |
| 1914 | /* |
| 1915 | * slim_alloc_ch: Allocate a slimbus channel and return its handle. |
| 1916 | * @sb: client handle. |
| 1917 | * @chanh: return channel handle |
| 1918 | * Slimbus channels are limited to 256 per specification. |
| 1919 | * -EXFULL is returned if all channels are in use. |
| 1920 | * Although slimbus specification supports 256 channels, a controller may not |
| 1921 | * support that many channels. |
| 1922 | */ |
| 1923 | int slim_alloc_ch(struct slim_device *sb, u16 *chanh) |
| 1924 | { |
| 1925 | struct slim_controller *ctrl = sb->ctrl; |
| 1926 | u16 i; |
| 1927 | |
| 1928 | if (!ctrl) |
| 1929 | return -EINVAL; |
| 1930 | mutex_lock(&ctrl->sched.m_reconf); |
| 1931 | for (i = 0; i < ctrl->nchans; i++) { |
| 1932 | if (ctrl->chans[i].state == SLIM_CH_FREE) |
| 1933 | break; |
| 1934 | } |
| 1935 | if (i >= ctrl->nchans) { |
| 1936 | mutex_unlock(&ctrl->sched.m_reconf); |
| 1937 | return -EXFULL; |
| 1938 | } |
| 1939 | *chanh = i; |
| 1940 | ctrl->chans[i].nextgrp = 0; |
| 1941 | ctrl->chans[i].state = SLIM_CH_ALLOCATED; |
| 1942 | ctrl->chans[i].chan = (u8)(ctrl->reserved + i); |
| 1943 | |
| 1944 | mutex_unlock(&ctrl->sched.m_reconf); |
| 1945 | return 0; |
| 1946 | } |
| 1947 | EXPORT_SYMBOL(slim_alloc_ch); |
| 1948 | |
| 1949 | /* |
| 1950 | * slim_query_ch: Get reference-counted handle for a channel number. Every |
| 1951 | * channel is reference counted by upto one as producer and the others as |
| 1952 | * consumer) |
| 1953 | * @sb: client handle |
| 1954 | * @chan: slimbus channel number |
| 1955 | * @chanh: return channel handle |
| 1956 | * If request channel number is not in use, it is allocated, and reference |
| 1957 | * count is set to one. If the channel was was already allocated, this API |
| 1958 | * will return handle to that channel and reference count is incremented. |
| 1959 | * -EXFULL is returned if all channels are in use |
| 1960 | */ |
| 1961 | int slim_query_ch(struct slim_device *sb, u8 ch, u16 *chanh) |
| 1962 | { |
| 1963 | struct slim_controller *ctrl = sb->ctrl; |
| 1964 | u16 i, j; |
| 1965 | int ret = 0; |
| 1966 | |
| 1967 | if (!ctrl || !chanh) |
| 1968 | return -EINVAL; |
| 1969 | mutex_lock(&ctrl->sched.m_reconf); |
| 1970 | /* start with modulo number */ |
| 1971 | i = ch % ctrl->nchans; |
| 1972 | |
| 1973 | for (j = 0; j < ctrl->nchans; j++) { |
| 1974 | if (ctrl->chans[i].chan == ch) { |
| 1975 | *chanh = i; |
| 1976 | ctrl->chans[i].ref++; |
| 1977 | if (ctrl->chans[i].state == SLIM_CH_FREE) |
| 1978 | ctrl->chans[i].state = SLIM_CH_ALLOCATED; |
| 1979 | goto query_out; |
| 1980 | } |
| 1981 | i = (i + 1) % ctrl->nchans; |
| 1982 | } |
| 1983 | |
| 1984 | /* Channel not in table yet */ |
| 1985 | ret = -EXFULL; |
| 1986 | for (j = 0; j < ctrl->nchans; j++) { |
| 1987 | if (ctrl->chans[i].state == SLIM_CH_FREE) { |
| 1988 | ctrl->chans[i].state = |
| 1989 | SLIM_CH_ALLOCATED; |
| 1990 | *chanh = i; |
| 1991 | ctrl->chans[i].ref++; |
| 1992 | ctrl->chans[i].chan = ch; |
| 1993 | ctrl->chans[i].nextgrp = 0; |
| 1994 | ret = 0; |
| 1995 | break; |
| 1996 | } |
| 1997 | i = (i + 1) % ctrl->nchans; |
| 1998 | } |
| 1999 | query_out: |
| 2000 | mutex_unlock(&ctrl->sched.m_reconf); |
| 2001 | dev_dbg(&ctrl->dev, "query ch:%d,hdl:%d,ref:%d,ret:%d", |
| 2002 | ch, i, ctrl->chans[i].ref, ret); |
| 2003 | return ret; |
| 2004 | } |
| 2005 | EXPORT_SYMBOL(slim_query_ch); |
| 2006 | |
| 2007 | /* |
| 2008 | * slim_dealloc_ch: Deallocate channel allocated using the API above |
| 2009 | * -EISCONN is returned if the channel is tried to be deallocated without |
| 2010 | * being removed first. |
| 2011 | * -ENOTCONN is returned if deallocation is tried on a channel that's not |
| 2012 | * allocated. |
| 2013 | */ |
| 2014 | int slim_dealloc_ch(struct slim_device *sb, u16 chanh) |
| 2015 | { |
| 2016 | struct slim_controller *ctrl = sb->ctrl; |
| 2017 | u8 chan = SLIM_HDL_TO_CHIDX(chanh); |
| 2018 | struct slim_ich *slc = &ctrl->chans[chan]; |
| 2019 | |
| 2020 | if (!ctrl) |
| 2021 | return -EINVAL; |
| 2022 | |
| 2023 | mutex_lock(&ctrl->sched.m_reconf); |
| 2024 | if (slc->state == SLIM_CH_FREE) { |
| 2025 | mutex_unlock(&ctrl->sched.m_reconf); |
| 2026 | return -ENOTCONN; |
| 2027 | } |
| 2028 | if (slc->ref > 1) { |
| 2029 | slc->ref--; |
| 2030 | mutex_unlock(&ctrl->sched.m_reconf); |
| 2031 | dev_dbg(&ctrl->dev, "remove chan:%d,hdl:%d,ref:%d", |
| 2032 | slc->chan, chanh, slc->ref); |
| 2033 | return 0; |
| 2034 | } |
| 2035 | if (slc->state >= SLIM_CH_PENDING_ACTIVE) { |
| 2036 | dev_err(&ctrl->dev, "Channel:%d should be removed first", chan); |
| 2037 | mutex_unlock(&ctrl->sched.m_reconf); |
| 2038 | return -EISCONN; |
| 2039 | } |
| 2040 | slc->ref--; |
| 2041 | slc->state = SLIM_CH_FREE; |
| 2042 | mutex_unlock(&ctrl->sched.m_reconf); |
| 2043 | dev_dbg(&ctrl->dev, "remove chan:%d,hdl:%d,ref:%d", |
| 2044 | slc->chan, chanh, slc->ref); |
| 2045 | return 0; |
| 2046 | } |
| 2047 | EXPORT_SYMBOL(slim_dealloc_ch); |
| 2048 | |
| 2049 | /* |
| 2050 | * slim_get_ch_state: Channel state. |
| 2051 | * This API returns the channel's state (active, suspended, inactive etc) |
| 2052 | */ |
| 2053 | enum slim_ch_state slim_get_ch_state(struct slim_device *sb, u16 chanh) |
| 2054 | { |
| 2055 | u8 chan = SLIM_HDL_TO_CHIDX(chanh); |
| 2056 | struct slim_ich *slc = &sb->ctrl->chans[chan]; |
| 2057 | |
| 2058 | return slc->state; |
| 2059 | } |
| 2060 | EXPORT_SYMBOL(slim_get_ch_state); |
| 2061 | |
| 2062 | /* |
| 2063 | * slim_define_ch: Define a channel.This API defines channel parameters for a |
| 2064 | * given channel. |
| 2065 | * @sb: client handle. |
| 2066 | * @prop: slim_ch structure with channel parameters desired to be used. |
| 2067 | * @chanh: list of channels to be defined. |
| 2068 | * @nchan: number of channels in a group (1 if grp is false) |
| 2069 | * @grp: Are the channels grouped |
| 2070 | * @grph: return group handle if grouping of channels is desired. |
| 2071 | * Channels can be grouped if multiple channels use same parameters |
| 2072 | * (e.g. 5.1 audio has 6 channels with same parameters. They will all be grouped |
| 2073 | * and given 1 handle for simplicity and avoid repeatedly calling the API) |
| 2074 | * -EISCONN is returned if channel is already used with different parameters. |
| 2075 | * -ENXIO is returned if the channel is not yet allocated. |
| 2076 | */ |
| 2077 | int slim_define_ch(struct slim_device *sb, struct slim_ch *prop, u16 *chanh, |
| 2078 | u8 nchan, bool grp, u16 *grph) |
| 2079 | { |
| 2080 | struct slim_controller *ctrl = sb->ctrl; |
| 2081 | int i, ret = 0; |
| 2082 | |
| 2083 | if (!ctrl || !chanh || !prop || !nchan) |
| 2084 | return -EINVAL; |
| 2085 | mutex_lock(&ctrl->sched.m_reconf); |
| 2086 | for (i = 0; i < nchan; i++) { |
| 2087 | u8 chan = SLIM_HDL_TO_CHIDX(chanh[i]); |
| 2088 | struct slim_ich *slc = &ctrl->chans[chan]; |
| 2089 | |
| 2090 | dev_dbg(&ctrl->dev, "define_ch: ch:%d, state:%d", chan, |
| 2091 | (int)ctrl->chans[chan].state); |
| 2092 | if (slc->state < SLIM_CH_ALLOCATED) { |
| 2093 | ret = -ENXIO; |
| 2094 | goto err_define_ch; |
| 2095 | } |
| 2096 | if (slc->state >= SLIM_CH_DEFINED && slc->ref >= 2) { |
| 2097 | if (prop->ratem != slc->prop.ratem || |
| 2098 | prop->sampleszbits != slc->prop.sampleszbits || |
| 2099 | prop->baser != slc->prop.baser) { |
| 2100 | ret = -EISCONN; |
| 2101 | goto err_define_ch; |
| 2102 | } |
| 2103 | } else if (slc->state > SLIM_CH_DEFINED) { |
| 2104 | ret = -EISCONN; |
| 2105 | goto err_define_ch; |
| 2106 | } else { |
| 2107 | ctrl->chans[chan].prop = *prop; |
| 2108 | ret = slim_nextdefine_ch(sb, chan); |
| 2109 | if (ret) |
| 2110 | goto err_define_ch; |
| 2111 | } |
| 2112 | if (i < (nchan - 1)) |
| 2113 | ctrl->chans[chan].nextgrp = chanh[i + 1]; |
| 2114 | if (i == 0) |
| 2115 | ctrl->chans[chan].nextgrp |= SLIM_START_GRP; |
| 2116 | if (i == (nchan - 1)) |
| 2117 | ctrl->chans[chan].nextgrp |= SLIM_END_GRP; |
| 2118 | } |
| 2119 | |
| 2120 | if (grp) |
| 2121 | *grph = ((nchan << 8) | SLIM_HDL_TO_CHIDX(chanh[0])); |
| 2122 | for (i = 0; i < nchan; i++) { |
| 2123 | u8 chan = SLIM_HDL_TO_CHIDX(chanh[i]); |
| 2124 | struct slim_ich *slc = &ctrl->chans[chan]; |
| 2125 | |
| 2126 | if (slc->state == SLIM_CH_ALLOCATED) |
| 2127 | slc->state = SLIM_CH_DEFINED; |
| 2128 | } |
| 2129 | err_define_ch: |
| 2130 | dev_dbg(&ctrl->dev, "define_ch: ch:%d, ret:%d", *chanh, ret); |
| 2131 | mutex_unlock(&ctrl->sched.m_reconf); |
| 2132 | return ret; |
| 2133 | } |
| 2134 | EXPORT_SYMBOL(slim_define_ch); |
| 2135 | |
| 2136 | static u32 getsubfrmcoding(u32 *ctrlw, u32 *subfrml, u32 *msgsl) |
| 2137 | { |
| 2138 | u32 code = 0; |
| 2139 | |
| 2140 | if (*ctrlw == *subfrml) { |
| 2141 | *ctrlw = 8; |
| 2142 | *subfrml = 8; |
| 2143 | *msgsl = SLIM_SL_PER_SUPERFRAME - SLIM_FRM_SLOTS_PER_SUPERFRAME |
| 2144 | - SLIM_GDE_SLOTS_PER_SUPERFRAME; |
| 2145 | return 0; |
| 2146 | } |
| 2147 | if (*subfrml == 6) { |
| 2148 | code = 0; |
| 2149 | *msgsl = 256; |
| 2150 | } else if (*subfrml == 8) { |
| 2151 | code = 1; |
| 2152 | *msgsl = 192; |
| 2153 | } else if (*subfrml == 24) { |
| 2154 | code = 2; |
| 2155 | *msgsl = 64; |
| 2156 | } else { /* 32 */ |
| 2157 | code = 3; |
| 2158 | *msgsl = 48; |
| 2159 | } |
| 2160 | |
| 2161 | if (*ctrlw < 8) { |
| 2162 | if (*ctrlw >= 6) { |
| 2163 | *ctrlw = 6; |
| 2164 | code |= 0x14; |
| 2165 | } else { |
| 2166 | if (*ctrlw == 5) |
| 2167 | *ctrlw = 4; |
| 2168 | code |= (*ctrlw << 2); |
| 2169 | } |
| 2170 | } else { |
| 2171 | code -= 2; |
| 2172 | if (*ctrlw >= 24) { |
| 2173 | *ctrlw = 24; |
| 2174 | code |= 0x1e; |
| 2175 | } else if (*ctrlw >= 16) { |
| 2176 | *ctrlw = 16; |
| 2177 | code |= 0x1c; |
| 2178 | } else if (*ctrlw >= 12) { |
| 2179 | *ctrlw = 12; |
| 2180 | code |= 0x1a; |
| 2181 | } else { |
| 2182 | *ctrlw = 8; |
| 2183 | code |= 0x18; |
| 2184 | } |
| 2185 | } |
| 2186 | |
| 2187 | *msgsl = (*msgsl * *ctrlw) - SLIM_FRM_SLOTS_PER_SUPERFRAME - |
| 2188 | SLIM_GDE_SLOTS_PER_SUPERFRAME; |
| 2189 | return code; |
| 2190 | } |
| 2191 | |
| 2192 | static void shiftsegoffsets(struct slim_controller *ctrl, struct slim_ich **ach, |
| 2193 | int sz, u32 shft) |
| 2194 | { |
| 2195 | int i; |
| 2196 | u32 oldoff; |
| 2197 | |
| 2198 | for (i = 0; i < sz; i++) { |
| 2199 | struct slim_ich *slc; |
| 2200 | |
| 2201 | if (ach[i] == NULL) |
| 2202 | continue; |
| 2203 | slc = ach[i]; |
| 2204 | if (slc->state == SLIM_CH_PENDING_REMOVAL) |
| 2205 | continue; |
| 2206 | oldoff = slc->newoff; |
| 2207 | slc->newoff += shft; |
| 2208 | /* seg. offset must be <= interval */ |
| 2209 | if (slc->newoff >= slc->newintr) |
| 2210 | slc->newoff -= slc->newintr; |
| 2211 | } |
| 2212 | } |
| 2213 | |
| 2214 | static inline int slim_sched_4k_coeff1_chans(struct slim_controller *ctrl, |
| 2215 | struct slim_ich **slc, int *coeff, int *opensl1, |
| 2216 | u32 expshft, u32 curintr, u32 curmaxsl, |
| 2217 | int curexp, int finalexp) |
| 2218 | { |
| 2219 | int coeff1; |
| 2220 | struct slim_ich *slc1; |
| 2221 | |
| 2222 | if (unlikely(!coeff || !slc || !ctrl || !opensl1)) |
| 2223 | return -EINVAL; |
| 2224 | |
| 2225 | coeff1 = *coeff; |
| 2226 | slc1 = *slc; |
| 2227 | while ((coeff1 < ctrl->sched.num_cc1) && |
| 2228 | (curexp == (int)(slc1->rootexp + expshft))) { |
| 2229 | if (slc1->state == SLIM_CH_PENDING_REMOVAL) { |
| 2230 | coeff1++; |
| 2231 | slc1 = ctrl->sched.chc1[coeff1]; |
| 2232 | continue; |
| 2233 | } |
| 2234 | if (opensl1[1] >= opensl1[0] || |
| 2235 | (finalexp == (int)slc1->rootexp && |
| 2236 | curintr <= 24 && opensl1[0] == curmaxsl)) { |
| 2237 | opensl1[1] -= slc1->seglen; |
| 2238 | slc1->newoff = curmaxsl + opensl1[1]; |
| 2239 | if (opensl1[1] < 0 && opensl1[0] == curmaxsl) { |
| 2240 | opensl1[0] += opensl1[1]; |
| 2241 | opensl1[1] = 0; |
| 2242 | if (opensl1[0] < 0) { |
| 2243 | dev_dbg(&ctrl->dev, |
| 2244 | "reconfig failed:%d\n", |
| 2245 | __LINE__); |
| 2246 | return -EXFULL; |
| 2247 | } |
| 2248 | } |
| 2249 | } else { |
| 2250 | if (slc1->seglen > opensl1[0]) { |
| 2251 | dev_dbg(&ctrl->dev, |
| 2252 | "reconfig failed:%d\n", __LINE__); |
| 2253 | return -EXFULL; |
| 2254 | } |
| 2255 | slc1->newoff = opensl1[0] - slc1->seglen; |
| 2256 | opensl1[0] = slc1->newoff; |
| 2257 | } |
| 2258 | slc1->newintr = curintr; |
| 2259 | coeff1++; |
| 2260 | slc1 = ctrl->sched.chc1[coeff1]; |
| 2261 | } |
| 2262 | *coeff = coeff1; |
| 2263 | *slc = slc1; |
| 2264 | return 0; |
| 2265 | } |
| 2266 | |
| 2267 | static int slim_sched_chans(struct slim_device *sb, u32 clkgear, |
| 2268 | u32 *ctrlw, u32 *subfrml) |
| 2269 | { |
| 2270 | int coeff1, coeff3; |
| 2271 | enum slim_ch_coeff bias; |
| 2272 | struct slim_controller *ctrl = sb->ctrl; |
| 2273 | int last1 = ctrl->sched.num_cc1 - 1; |
| 2274 | int last3 = ctrl->sched.num_cc3 - 1; |
| 2275 | |
| 2276 | /* |
| 2277 | * Find first channels with coeff 1 & 3 as starting points for |
| 2278 | * scheduling |
| 2279 | */ |
| 2280 | for (coeff3 = 0; coeff3 < ctrl->sched.num_cc3; coeff3++) { |
| 2281 | struct slim_ich *slc = ctrl->sched.chc3[coeff3]; |
| 2282 | |
| 2283 | if (slc->state == SLIM_CH_PENDING_REMOVAL) |
| 2284 | continue; |
| 2285 | else |
| 2286 | break; |
| 2287 | } |
| 2288 | for (coeff1 = 0; coeff1 < ctrl->sched.num_cc1; coeff1++) { |
| 2289 | struct slim_ich *slc = ctrl->sched.chc1[coeff1]; |
| 2290 | |
| 2291 | if (slc->state == SLIM_CH_PENDING_REMOVAL) |
| 2292 | continue; |
| 2293 | else |
| 2294 | break; |
| 2295 | } |
| 2296 | if (coeff3 == ctrl->sched.num_cc3 && coeff1 == ctrl->sched.num_cc1) { |
| 2297 | *ctrlw = 8; |
| 2298 | *subfrml = 8; |
| 2299 | return 0; |
| 2300 | } else if (coeff3 == ctrl->sched.num_cc3) |
| 2301 | bias = SLIM_COEFF_1; |
| 2302 | else |
| 2303 | bias = SLIM_COEFF_3; |
| 2304 | |
| 2305 | /* |
| 2306 | * Find last chan in coeff1, 3 list, we will use to know when we |
| 2307 | * have done scheduling all coeff1 channels |
| 2308 | */ |
| 2309 | while (last1 >= 0) { |
| 2310 | if (ctrl->sched.chc1[last1] != NULL && |
| 2311 | (ctrl->sched.chc1[last1])->state != |
| 2312 | SLIM_CH_PENDING_REMOVAL) |
| 2313 | break; |
| 2314 | last1--; |
| 2315 | } |
| 2316 | while (last3 >= 0) { |
| 2317 | if (ctrl->sched.chc3[last3] != NULL && |
| 2318 | (ctrl->sched.chc3[last3])->state != |
| 2319 | SLIM_CH_PENDING_REMOVAL) |
| 2320 | break; |
| 2321 | last3--; |
| 2322 | } |
| 2323 | |
| 2324 | if (bias == SLIM_COEFF_1) { |
| 2325 | struct slim_ich *slc1 = ctrl->sched.chc1[coeff1]; |
| 2326 | u32 expshft = SLIM_MAX_CLK_GEAR - clkgear; |
| 2327 | int curexp, finalexp; |
| 2328 | u32 curintr, curmaxsl; |
| 2329 | int opensl1[2]; |
| 2330 | int maxctrlw1; |
| 2331 | int ret; |
| 2332 | |
| 2333 | finalexp = (ctrl->sched.chc1[last1])->rootexp; |
| 2334 | curexp = (int)expshft - 1; |
| 2335 | |
| 2336 | curintr = (SLIM_MAX_INTR_COEFF_1 * 2) >> (curexp + 1); |
| 2337 | curmaxsl = curintr >> 1; |
| 2338 | opensl1[0] = opensl1[1] = curmaxsl; |
| 2339 | |
| 2340 | while ((coeff1 < ctrl->sched.num_cc1) || (curintr > 24)) { |
| 2341 | curintr >>= 1; |
| 2342 | curmaxsl >>= 1; |
| 2343 | |
| 2344 | /* update 4K family open slot records */ |
| 2345 | if (opensl1[1] < opensl1[0]) |
| 2346 | opensl1[1] -= curmaxsl; |
| 2347 | else |
| 2348 | opensl1[1] = opensl1[0] - curmaxsl; |
| 2349 | opensl1[0] = curmaxsl; |
| 2350 | if (opensl1[1] < 0) { |
| 2351 | opensl1[0] += opensl1[1]; |
| 2352 | opensl1[1] = 0; |
| 2353 | } |
| 2354 | if (opensl1[0] <= 0) { |
| 2355 | dev_dbg(&ctrl->dev, "reconfig failed:%d\n", |
| 2356 | __LINE__); |
| 2357 | return -EXFULL; |
| 2358 | } |
| 2359 | curexp++; |
| 2360 | /* schedule 4k family channels */ |
| 2361 | ret = slim_sched_4k_coeff1_chans(ctrl, &slc1, &coeff1, |
| 2362 | opensl1, expshft, curintr, curmaxsl, |
| 2363 | curexp, finalexp); |
| 2364 | if (ret) |
| 2365 | return ret; |
| 2366 | } |
| 2367 | /* Leave some slots for messaging space */ |
| 2368 | if (opensl1[1] <= 0 && opensl1[0] <= 0) |
| 2369 | return -EXFULL; |
| 2370 | if (opensl1[1] > opensl1[0]) { |
| 2371 | int temp = opensl1[0]; |
| 2372 | |
| 2373 | opensl1[0] = opensl1[1]; |
| 2374 | opensl1[1] = temp; |
| 2375 | shiftsegoffsets(ctrl, ctrl->sched.chc1, |
| 2376 | ctrl->sched.num_cc1, curmaxsl); |
| 2377 | } |
| 2378 | /* choose subframe mode to maximize bw */ |
| 2379 | maxctrlw1 = opensl1[0]; |
| 2380 | if (opensl1[0] == curmaxsl) |
| 2381 | maxctrlw1 += opensl1[1]; |
| 2382 | if (curintr >= 24) { |
| 2383 | *subfrml = 24; |
| 2384 | *ctrlw = maxctrlw1; |
| 2385 | } else if (curintr == 12) { |
| 2386 | if (maxctrlw1 > opensl1[1] * 4) { |
| 2387 | *subfrml = 24; |
| 2388 | *ctrlw = maxctrlw1; |
| 2389 | } else { |
| 2390 | *subfrml = 6; |
| 2391 | *ctrlw = opensl1[1]; |
| 2392 | } |
| 2393 | } else { |
| 2394 | *subfrml = 6; |
| 2395 | *ctrlw = maxctrlw1; |
| 2396 | } |
| 2397 | } else { |
| 2398 | struct slim_ich *slc1 = NULL; |
| 2399 | struct slim_ich *slc3 = ctrl->sched.chc3[coeff3]; |
| 2400 | u32 expshft = SLIM_MAX_CLK_GEAR - clkgear; |
| 2401 | int curexp, finalexp, exp1; |
| 2402 | u32 curintr, curmaxsl; |
| 2403 | int opensl3[2]; |
| 2404 | int opensl1[6]; |
| 2405 | bool opensl1valid = false; |
| 2406 | int maxctrlw1, maxctrlw3, i; |
| 2407 | |
Dilip Kota | fa1fbc9 | 2017-09-04 14:36:43 +0530 | [diff] [blame] | 2408 | /* intitalize array to zero */ |
| 2409 | memset(opensl1, 0x0, sizeof(opensl1)); |
Sagar Dharia | be37c9c | 2016-11-28 23:06:58 -0700 | [diff] [blame] | 2410 | finalexp = (ctrl->sched.chc3[last3])->rootexp; |
| 2411 | if (last1 >= 0) { |
| 2412 | slc1 = ctrl->sched.chc1[coeff1]; |
| 2413 | exp1 = (ctrl->sched.chc1[last1])->rootexp; |
| 2414 | if (exp1 > finalexp) |
| 2415 | finalexp = exp1; |
| 2416 | } |
| 2417 | curexp = (int)expshft - 1; |
| 2418 | |
| 2419 | curintr = (SLIM_MAX_INTR_COEFF_3 * 2) >> (curexp + 1); |
| 2420 | curmaxsl = curintr >> 1; |
| 2421 | opensl3[0] = opensl3[1] = curmaxsl; |
| 2422 | |
| 2423 | while (coeff1 < ctrl->sched.num_cc1 || |
| 2424 | coeff3 < ctrl->sched.num_cc3 || |
| 2425 | curintr > 32) { |
| 2426 | curintr >>= 1; |
| 2427 | curmaxsl >>= 1; |
| 2428 | |
| 2429 | /* update 12k family open slot records */ |
| 2430 | if (opensl3[1] < opensl3[0]) |
| 2431 | opensl3[1] -= curmaxsl; |
| 2432 | else |
| 2433 | opensl3[1] = opensl3[0] - curmaxsl; |
| 2434 | opensl3[0] = curmaxsl; |
| 2435 | if (opensl3[1] < 0) { |
| 2436 | opensl3[0] += opensl3[1]; |
| 2437 | opensl3[1] = 0; |
| 2438 | } |
| 2439 | if (opensl3[0] <= 0) { |
| 2440 | dev_dbg(&ctrl->dev, "reconfig failed:%d\n", |
| 2441 | __LINE__); |
| 2442 | return -EXFULL; |
| 2443 | } |
| 2444 | curexp++; |
| 2445 | |
| 2446 | /* schedule 12k family channels */ |
| 2447 | while (coeff3 < ctrl->sched.num_cc3 && |
| 2448 | curexp == (int)slc3->rootexp + expshft) { |
| 2449 | if (slc3->state == SLIM_CH_PENDING_REMOVAL) { |
| 2450 | coeff3++; |
| 2451 | slc3 = ctrl->sched.chc3[coeff3]; |
| 2452 | continue; |
| 2453 | } |
| 2454 | opensl1valid = false; |
| 2455 | if (opensl3[1] >= opensl3[0] || |
| 2456 | (finalexp == (int)slc3->rootexp && |
| 2457 | curintr <= 32 && |
| 2458 | opensl3[0] == curmaxsl && |
| 2459 | last1 < 0)) { |
| 2460 | opensl3[1] -= slc3->seglen; |
| 2461 | slc3->newoff = curmaxsl + opensl3[1]; |
| 2462 | if (opensl3[1] < 0 && |
| 2463 | opensl3[0] == curmaxsl) { |
| 2464 | opensl3[0] += opensl3[1]; |
| 2465 | opensl3[1] = 0; |
| 2466 | } |
| 2467 | if (opensl3[0] < 0) { |
| 2468 | dev_dbg(&ctrl->dev, |
| 2469 | "reconfig failed:%d\n", |
| 2470 | __LINE__); |
| 2471 | return -EXFULL; |
| 2472 | } |
| 2473 | } else { |
| 2474 | if (slc3->seglen > opensl3[0]) { |
| 2475 | dev_dbg(&ctrl->dev, |
| 2476 | "reconfig failed:%d\n", |
| 2477 | __LINE__); |
| 2478 | return -EXFULL; |
| 2479 | } |
| 2480 | slc3->newoff = opensl3[0] - |
| 2481 | slc3->seglen; |
| 2482 | opensl3[0] = slc3->newoff; |
| 2483 | } |
| 2484 | slc3->newintr = curintr; |
| 2485 | coeff3++; |
| 2486 | slc3 = ctrl->sched.chc3[coeff3]; |
| 2487 | } |
| 2488 | /* update 4k openslot records */ |
| 2489 | if (opensl1valid == false) { |
| 2490 | for (i = 0; i < 3; i++) { |
| 2491 | opensl1[i * 2] = opensl3[0]; |
| 2492 | opensl1[(i * 2) + 1] = opensl3[1]; |
| 2493 | } |
| 2494 | } else { |
| 2495 | int opensl1p[6]; |
| 2496 | |
| 2497 | memcpy(opensl1p, opensl1, sizeof(opensl1)); |
| 2498 | for (i = 0; i < 3; i++) { |
| 2499 | if (opensl1p[i] < opensl1p[i + 3]) |
| 2500 | opensl1[(i * 2) + 1] = |
| 2501 | opensl1p[i]; |
| 2502 | else |
| 2503 | opensl1[(i * 2) + 1] = |
| 2504 | opensl1p[i + 3]; |
| 2505 | } |
| 2506 | for (i = 0; i < 3; i++) { |
| 2507 | opensl1[(i * 2) + 1] -= curmaxsl; |
| 2508 | opensl1[i * 2] = curmaxsl; |
| 2509 | if (opensl1[(i * 2) + 1] < 0) { |
| 2510 | opensl1[i * 2] += |
| 2511 | opensl1[(i * 2) + 1]; |
| 2512 | opensl1[(i * 2) + 1] = 0; |
| 2513 | } |
| 2514 | if (opensl1[i * 2] < 0) { |
| 2515 | dev_dbg(&ctrl->dev, |
| 2516 | "reconfig failed:%d\n", |
| 2517 | __LINE__); |
| 2518 | return -EXFULL; |
| 2519 | } |
| 2520 | } |
| 2521 | } |
| 2522 | /* schedule 4k family channels */ |
Karthikeyan Ramasubramanian | 8c1c5f5 | 2017-10-04 10:57:18 -0600 | [diff] [blame] | 2523 | while (coeff1 < ctrl->sched.num_cc1 && slc1 && |
Sagar Dharia | be37c9c | 2016-11-28 23:06:58 -0700 | [diff] [blame] | 2524 | curexp == (int)slc1->rootexp + expshft) { |
| 2525 | /* searchorder effective when opensl valid */ |
| 2526 | static const int srcho[] = { 5, 2, 4, 1, 3, 0 }; |
| 2527 | int maxopensl = 0; |
| 2528 | int maxi = 0; |
| 2529 | |
| 2530 | if (slc1->state == SLIM_CH_PENDING_REMOVAL) { |
| 2531 | coeff1++; |
| 2532 | slc1 = ctrl->sched.chc1[coeff1]; |
| 2533 | continue; |
| 2534 | } |
| 2535 | opensl1valid = true; |
| 2536 | for (i = 0; i < 6; i++) { |
| 2537 | if (opensl1[srcho[i]] > maxopensl) { |
| 2538 | maxopensl = opensl1[srcho[i]]; |
| 2539 | maxi = srcho[i]; |
| 2540 | } |
| 2541 | } |
| 2542 | opensl1[maxi] -= slc1->seglen; |
| 2543 | slc1->newoff = (curmaxsl * maxi) + |
| 2544 | opensl1[maxi]; |
| 2545 | if (opensl1[maxi] < 0 && (maxi & 1) == 1 && |
| 2546 | opensl1[maxi - 1] == curmaxsl) { |
| 2547 | opensl1[maxi - 1] += opensl1[maxi]; |
| 2548 | if (opensl3[0] > opensl1[maxi - 1]) |
| 2549 | opensl3[0] = opensl1[maxi - 1]; |
| 2550 | opensl3[1] = 0; |
| 2551 | opensl1[maxi] = 0; |
| 2552 | if (opensl1[maxi - 1] < 0) { |
| 2553 | dev_dbg(&ctrl->dev, |
| 2554 | "reconfig failed:%d\n", |
| 2555 | __LINE__); |
| 2556 | return -EXFULL; |
| 2557 | } |
| 2558 | } else if (opensl1[maxi] < 0) { |
| 2559 | dev_dbg(&ctrl->dev, |
| 2560 | "reconfig failed:%d\n", |
| 2561 | __LINE__); |
| 2562 | return -EXFULL; |
| 2563 | } else if (opensl3[maxi & 1] > opensl1[maxi]) { |
| 2564 | opensl3[maxi & 1] = opensl1[maxi]; |
| 2565 | } |
| 2566 | slc1->newintr = curintr * 3; |
| 2567 | coeff1++; |
| 2568 | slc1 = ctrl->sched.chc1[coeff1]; |
| 2569 | } |
| 2570 | } |
| 2571 | /* Leave some slots for messaging space */ |
| 2572 | if (opensl3[1] <= 0 && opensl3[0] <= 0) |
| 2573 | return -EXFULL; |
| 2574 | /* swap 1st and 2nd bucket if 2nd bucket has more open slots */ |
| 2575 | if (opensl3[1] > opensl3[0]) { |
| 2576 | int temp = opensl3[0]; |
| 2577 | |
| 2578 | opensl3[0] = opensl3[1]; |
| 2579 | opensl3[1] = temp; |
| 2580 | temp = opensl1[5]; |
| 2581 | opensl1[5] = opensl1[4]; |
| 2582 | opensl1[4] = opensl1[3]; |
| 2583 | opensl1[3] = opensl1[2]; |
| 2584 | opensl1[2] = opensl1[1]; |
| 2585 | opensl1[1] = opensl1[0]; |
| 2586 | opensl1[0] = temp; |
| 2587 | shiftsegoffsets(ctrl, ctrl->sched.chc1, |
| 2588 | ctrl->sched.num_cc1, curmaxsl); |
| 2589 | shiftsegoffsets(ctrl, ctrl->sched.chc3, |
| 2590 | ctrl->sched.num_cc3, curmaxsl); |
| 2591 | } |
| 2592 | /* subframe mode to maximize BW */ |
| 2593 | maxctrlw3 = opensl3[0]; |
| 2594 | maxctrlw1 = opensl1[0]; |
| 2595 | if (opensl3[0] == curmaxsl) |
| 2596 | maxctrlw3 += opensl3[1]; |
| 2597 | for (i = 0; i < 5 && opensl1[i] == curmaxsl; i++) |
| 2598 | maxctrlw1 += opensl1[i + 1]; |
| 2599 | if (curintr >= 32) { |
| 2600 | *subfrml = 32; |
| 2601 | *ctrlw = maxctrlw3; |
| 2602 | } else if (curintr == 16) { |
| 2603 | if (maxctrlw3 > (opensl3[1] * 4)) { |
| 2604 | *subfrml = 32; |
| 2605 | *ctrlw = maxctrlw3; |
| 2606 | } else { |
| 2607 | *subfrml = 8; |
| 2608 | *ctrlw = opensl3[1]; |
| 2609 | } |
| 2610 | } else { |
| 2611 | if ((maxctrlw1 * 8) >= (maxctrlw3 * 24)) { |
| 2612 | *subfrml = 24; |
| 2613 | *ctrlw = maxctrlw1; |
| 2614 | } else { |
| 2615 | *subfrml = 8; |
| 2616 | *ctrlw = maxctrlw3; |
| 2617 | } |
| 2618 | } |
| 2619 | } |
| 2620 | return 0; |
| 2621 | } |
| 2622 | |
| 2623 | #ifdef DEBUG |
| 2624 | static int slim_verifychansched(struct slim_controller *ctrl, u32 ctrlw, |
| 2625 | u32 subfrml, u32 clkgear) |
| 2626 | { |
| 2627 | int sl, i; |
| 2628 | int cc1 = 0; |
| 2629 | int cc3 = 0; |
| 2630 | struct slim_ich *slc = NULL; |
| 2631 | |
| 2632 | if (!ctrl->sched.slots) |
| 2633 | return 0; |
| 2634 | memset(ctrl->sched.slots, 0, SLIM_SL_PER_SUPERFRAME); |
| 2635 | dev_dbg(&ctrl->dev, "Clock gear is:%d\n", clkgear); |
| 2636 | for (sl = 0; sl < SLIM_SL_PER_SUPERFRAME; sl += subfrml) { |
| 2637 | for (i = 0; i < ctrlw; i++) |
| 2638 | ctrl->sched.slots[sl + i] = 33; |
| 2639 | } |
| 2640 | while (cc1 < ctrl->sched.num_cc1) { |
| 2641 | slc = ctrl->sched.chc1[cc1]; |
| 2642 | if (slc == NULL) { |
| 2643 | dev_err(&ctrl->dev, "SLC1 null in verify: chan%d\n", |
| 2644 | cc1); |
| 2645 | return -EIO; |
| 2646 | } |
| 2647 | dev_dbg(&ctrl->dev, "chan:%d, offset:%d, intr:%d, seglen:%d\n", |
| 2648 | (slc - ctrl->chans), slc->newoff, |
| 2649 | slc->newintr, slc->seglen); |
| 2650 | |
| 2651 | if (slc->state != SLIM_CH_PENDING_REMOVAL) { |
| 2652 | for (sl = slc->newoff; |
| 2653 | sl < SLIM_SL_PER_SUPERFRAME; |
| 2654 | sl += slc->newintr) { |
| 2655 | for (i = 0; i < slc->seglen; i++) { |
| 2656 | if (ctrl->sched.slots[sl + i]) |
| 2657 | return -EXFULL; |
| 2658 | ctrl->sched.slots[sl + i] = cc1 + 1; |
| 2659 | } |
| 2660 | } |
| 2661 | } |
| 2662 | cc1++; |
| 2663 | } |
| 2664 | while (cc3 < ctrl->sched.num_cc3) { |
| 2665 | slc = ctrl->sched.chc3[cc3]; |
| 2666 | if (slc == NULL) { |
| 2667 | dev_err(&ctrl->dev, "SLC3 null in verify: chan%d\n", |
| 2668 | cc3); |
| 2669 | return -EIO; |
| 2670 | } |
| 2671 | dev_dbg(&ctrl->dev, "chan:%d, offset:%d, intr:%d, seglen:%d\n", |
| 2672 | (slc - ctrl->chans), slc->newoff, |
| 2673 | slc->newintr, slc->seglen); |
| 2674 | if (slc->state != SLIM_CH_PENDING_REMOVAL) { |
| 2675 | for (sl = slc->newoff; |
| 2676 | sl < SLIM_SL_PER_SUPERFRAME; |
| 2677 | sl += slc->newintr) { |
| 2678 | for (i = 0; i < slc->seglen; i++) { |
| 2679 | if (ctrl->sched.slots[sl + i]) |
| 2680 | return -EXFULL; |
| 2681 | ctrl->sched.slots[sl + i] = cc3 + 1; |
| 2682 | } |
| 2683 | } |
| 2684 | } |
| 2685 | cc3++; |
| 2686 | } |
| 2687 | |
| 2688 | return 0; |
| 2689 | } |
| 2690 | #else |
| 2691 | static int slim_verifychansched(struct slim_controller *ctrl, u32 ctrlw, |
| 2692 | u32 subfrml, u32 clkgear) |
| 2693 | { |
| 2694 | return 0; |
| 2695 | } |
| 2696 | #endif |
| 2697 | |
| 2698 | static void slim_sort_chan_grp(struct slim_controller *ctrl, |
| 2699 | struct slim_ich *slc) |
| 2700 | { |
| 2701 | u8 last = (u8)-1; |
| 2702 | u8 second = 0; |
| 2703 | |
| 2704 | for (; last > 0; last--) { |
| 2705 | struct slim_ich *slc1 = slc; |
| 2706 | struct slim_ich *slc2; |
| 2707 | u8 next = SLIM_HDL_TO_CHIDX(slc1->nextgrp); |
| 2708 | |
| 2709 | slc2 = &ctrl->chans[next]; |
| 2710 | for (second = 1; second <= last && slc2 && |
| 2711 | (slc2->state == SLIM_CH_ACTIVE || |
| 2712 | slc2->state == SLIM_CH_PENDING_ACTIVE); second++) { |
| 2713 | if (slc1->newoff > slc2->newoff) { |
| 2714 | u32 temp = slc2->newoff; |
| 2715 | |
| 2716 | slc2->newoff = slc1->newoff; |
| 2717 | slc1->newoff = temp; |
| 2718 | } |
| 2719 | if (slc2->nextgrp & SLIM_END_GRP) { |
| 2720 | last = second; |
| 2721 | break; |
| 2722 | } |
| 2723 | slc1 = slc2; |
| 2724 | next = SLIM_HDL_TO_CHIDX(slc1->nextgrp); |
| 2725 | slc2 = &ctrl->chans[next]; |
| 2726 | } |
| 2727 | if (slc2 == NULL) |
| 2728 | last = second - 1; |
| 2729 | } |
| 2730 | } |
| 2731 | |
| 2732 | |
| 2733 | static int slim_allocbw(struct slim_device *sb, int *subfrmc, int *clkgear) |
| 2734 | { |
| 2735 | u32 msgsl = 0; |
| 2736 | u32 ctrlw = 0; |
| 2737 | u32 subfrml = 0; |
| 2738 | int ret = -EIO; |
| 2739 | struct slim_controller *ctrl = sb->ctrl; |
| 2740 | u32 usedsl = ctrl->sched.usedslots + ctrl->sched.pending_msgsl; |
| 2741 | u32 availsl = SLIM_SL_PER_SUPERFRAME - SLIM_FRM_SLOTS_PER_SUPERFRAME - |
| 2742 | SLIM_GDE_SLOTS_PER_SUPERFRAME; |
| 2743 | *clkgear = SLIM_MAX_CLK_GEAR; |
| 2744 | |
| 2745 | dev_dbg(&ctrl->dev, "used sl:%u, availlable sl:%u\n", usedsl, availsl); |
| 2746 | dev_dbg(&ctrl->dev, "pending:chan sl:%u, :msg sl:%u, clkgear:%u\n", |
| 2747 | ctrl->sched.usedslots, |
| 2748 | ctrl->sched.pending_msgsl, *clkgear); |
| 2749 | /* |
| 2750 | * If number of slots are 0, that means channels are inactive. |
| 2751 | * It is very likely that the manager will call clock pause very soon. |
| 2752 | * By making sure that bus is in MAX_GEAR, clk pause sequence will take |
| 2753 | * minimum amount of time. |
| 2754 | */ |
| 2755 | if (ctrl->sched.usedslots != 0) { |
| 2756 | while ((usedsl * 2 <= availsl) && (*clkgear > ctrl->min_cg)) { |
| 2757 | *clkgear -= 1; |
| 2758 | usedsl *= 2; |
| 2759 | } |
| 2760 | } |
| 2761 | |
| 2762 | /* |
| 2763 | * Try scheduling data channels at current clock gear, if all channels |
| 2764 | * can be scheduled, or reserved BW can't be satisfied, increase clock |
| 2765 | * gear and try again |
| 2766 | */ |
| 2767 | for (; *clkgear <= ctrl->max_cg; (*clkgear)++) { |
| 2768 | ret = slim_sched_chans(sb, *clkgear, &ctrlw, &subfrml); |
| 2769 | |
| 2770 | if (ret == 0) { |
| 2771 | *subfrmc = getsubfrmcoding(&ctrlw, &subfrml, &msgsl); |
| 2772 | if ((msgsl >> (ctrl->max_cg - *clkgear) < |
| 2773 | ctrl->sched.pending_msgsl) && |
| 2774 | (*clkgear < ctrl->max_cg)) |
| 2775 | continue; |
| 2776 | else |
| 2777 | break; |
| 2778 | } |
| 2779 | } |
| 2780 | if (ret == 0) { |
| 2781 | int i; |
| 2782 | /* Sort channel-groups */ |
| 2783 | for (i = 0; i < ctrl->sched.num_cc1; i++) { |
| 2784 | struct slim_ich *slc = ctrl->sched.chc1[i]; |
| 2785 | |
| 2786 | if (slc->state == SLIM_CH_PENDING_REMOVAL) |
| 2787 | continue; |
| 2788 | if ((slc->nextgrp & SLIM_START_GRP) && |
| 2789 | !(slc->nextgrp & SLIM_END_GRP)) { |
| 2790 | slim_sort_chan_grp(ctrl, slc); |
| 2791 | } |
| 2792 | } |
| 2793 | for (i = 0; i < ctrl->sched.num_cc3; i++) { |
| 2794 | struct slim_ich *slc = ctrl->sched.chc3[i]; |
| 2795 | |
| 2796 | if (slc->state == SLIM_CH_PENDING_REMOVAL) |
| 2797 | continue; |
| 2798 | if ((slc->nextgrp & SLIM_START_GRP) && |
| 2799 | !(slc->nextgrp & SLIM_END_GRP)) { |
| 2800 | slim_sort_chan_grp(ctrl, slc); |
| 2801 | } |
| 2802 | } |
| 2803 | |
| 2804 | ret = slim_verifychansched(ctrl, ctrlw, subfrml, *clkgear); |
| 2805 | } |
| 2806 | |
| 2807 | return ret; |
| 2808 | } |
| 2809 | |
| 2810 | static void slim_change_existing_chans(struct slim_controller *ctrl, int coeff) |
| 2811 | { |
| 2812 | struct slim_ich **arr; |
| 2813 | int len, i; |
| 2814 | |
| 2815 | if (coeff == SLIM_COEFF_1) { |
| 2816 | arr = ctrl->sched.chc1; |
| 2817 | len = ctrl->sched.num_cc1; |
| 2818 | } else { |
| 2819 | arr = ctrl->sched.chc3; |
| 2820 | len = ctrl->sched.num_cc3; |
| 2821 | } |
| 2822 | for (i = 0; i < len; i++) { |
| 2823 | struct slim_ich *slc = arr[i]; |
| 2824 | |
| 2825 | if (slc->state == SLIM_CH_ACTIVE || |
Stephen Boyd | 6a95fe7 | 2017-03-01 17:06:32 -0800 | [diff] [blame] | 2826 | slc->state == SLIM_CH_SUSPENDED) { |
Sagar Dharia | be37c9c | 2016-11-28 23:06:58 -0700 | [diff] [blame] | 2827 | slc->offset = slc->newoff; |
| 2828 | slc->interval = slc->newintr; |
Stephen Boyd | 6a95fe7 | 2017-03-01 17:06:32 -0800 | [diff] [blame] | 2829 | } |
Sagar Dharia | be37c9c | 2016-11-28 23:06:58 -0700 | [diff] [blame] | 2830 | } |
| 2831 | } |
| 2832 | static void slim_chan_changes(struct slim_device *sb, bool revert) |
| 2833 | { |
| 2834 | struct slim_controller *ctrl = sb->ctrl; |
| 2835 | |
| 2836 | while (!list_empty(&sb->mark_define)) { |
| 2837 | struct slim_ich *slc; |
| 2838 | struct slim_pending_ch *pch = |
| 2839 | list_entry(sb->mark_define.next, |
| 2840 | struct slim_pending_ch, pending); |
| 2841 | slc = &ctrl->chans[pch->chan]; |
| 2842 | if (revert) { |
| 2843 | if (slc->state == SLIM_CH_PENDING_ACTIVE) { |
| 2844 | u32 sl = slc->seglen << slc->rootexp; |
| 2845 | |
| 2846 | if (slc->coeff == SLIM_COEFF_3) |
| 2847 | sl *= 3; |
| 2848 | if (!ctrl->allocbw) |
| 2849 | ctrl->sched.usedslots -= sl; |
| 2850 | slim_remove_ch(ctrl, slc); |
| 2851 | slc->state = SLIM_CH_DEFINED; |
| 2852 | } |
| 2853 | } else { |
| 2854 | slc->state = SLIM_CH_ACTIVE; |
| 2855 | slc->def++; |
| 2856 | } |
| 2857 | list_del_init(&pch->pending); |
| 2858 | kfree(pch); |
| 2859 | } |
| 2860 | |
| 2861 | while (!list_empty(&sb->mark_removal)) { |
| 2862 | struct slim_pending_ch *pch = |
| 2863 | list_entry(sb->mark_removal.next, |
| 2864 | struct slim_pending_ch, pending); |
| 2865 | struct slim_ich *slc = &ctrl->chans[pch->chan]; |
| 2866 | u32 sl = slc->seglen << slc->rootexp; |
| 2867 | |
| 2868 | if (revert || slc->def > 0) { |
| 2869 | if (slc->coeff == SLIM_COEFF_3) |
| 2870 | sl *= 3; |
| 2871 | if (!ctrl->allocbw) |
| 2872 | ctrl->sched.usedslots += sl; |
| 2873 | if (revert) |
| 2874 | slc->def++; |
| 2875 | slc->state = SLIM_CH_ACTIVE; |
| 2876 | } else |
| 2877 | slim_remove_ch(ctrl, slc); |
| 2878 | list_del_init(&pch->pending); |
| 2879 | kfree(pch); |
| 2880 | } |
| 2881 | |
| 2882 | while (!list_empty(&sb->mark_suspend)) { |
| 2883 | struct slim_pending_ch *pch = |
| 2884 | list_entry(sb->mark_suspend.next, |
| 2885 | struct slim_pending_ch, pending); |
| 2886 | struct slim_ich *slc = &ctrl->chans[pch->chan]; |
| 2887 | |
| 2888 | if (revert) |
| 2889 | slc->state = SLIM_CH_ACTIVE; |
| 2890 | list_del_init(&pch->pending); |
| 2891 | kfree(pch); |
| 2892 | } |
| 2893 | /* Change already active channel if reconfig succeeded */ |
| 2894 | if (!revert) { |
| 2895 | slim_change_existing_chans(ctrl, SLIM_COEFF_1); |
| 2896 | slim_change_existing_chans(ctrl, SLIM_COEFF_3); |
| 2897 | } |
| 2898 | } |
| 2899 | |
| 2900 | /* |
| 2901 | * slim_reconfigure_now: Request reconfiguration now. |
| 2902 | * @sb: client handle |
| 2903 | * This API does what commit flag in other scheduling APIs do. |
| 2904 | * -EXFULL is returned if there is no space in TDM to reserve the |
| 2905 | * bandwidth. -EBUSY is returned if reconfiguration request is already in |
| 2906 | * progress. |
| 2907 | */ |
| 2908 | int slim_reconfigure_now(struct slim_device *sb) |
| 2909 | { |
| 2910 | u8 i; |
| 2911 | u8 wbuf[4]; |
| 2912 | u32 clkgear, subframe; |
| 2913 | u32 curexp; |
| 2914 | int ret; |
| 2915 | struct slim_controller *ctrl = sb->ctrl; |
| 2916 | u32 expshft; |
| 2917 | u32 segdist; |
| 2918 | struct slim_pending_ch *pch; |
| 2919 | DEFINE_SLIM_BCAST_TXN(txn, SLIM_MSG_MC_BEGIN_RECONFIGURATION, 0, 3, |
| 2920 | NULL, NULL, sb->laddr); |
| 2921 | |
| 2922 | mutex_lock(&ctrl->sched.m_reconf); |
| 2923 | /* |
| 2924 | * If there are no pending changes from this client, avoid sending |
| 2925 | * the reconfiguration sequence |
| 2926 | */ |
| 2927 | if (sb->pending_msgsl == sb->cur_msgsl && |
| 2928 | list_empty(&sb->mark_define) && |
| 2929 | list_empty(&sb->mark_suspend)) { |
| 2930 | struct list_head *pos, *next; |
| 2931 | |
| 2932 | list_for_each_safe(pos, next, &sb->mark_removal) { |
| 2933 | struct slim_ich *slc; |
| 2934 | |
| 2935 | pch = list_entry(pos, struct slim_pending_ch, pending); |
| 2936 | slc = &ctrl->chans[pch->chan]; |
| 2937 | if (slc->def > 0) |
| 2938 | slc->def--; |
| 2939 | /* Disconnect source port to free it up */ |
| 2940 | if (SLIM_HDL_TO_LA(slc->srch) == sb->laddr) |
| 2941 | slc->srch = 0; |
| 2942 | /* |
| 2943 | * If controller overrides BW allocation, |
| 2944 | * delete this in remove channel itself |
| 2945 | */ |
| 2946 | if (slc->def != 0 && !ctrl->allocbw) { |
| 2947 | list_del(&pch->pending); |
| 2948 | kfree(pch); |
| 2949 | } |
| 2950 | } |
| 2951 | if (list_empty(&sb->mark_removal)) { |
| 2952 | mutex_unlock(&ctrl->sched.m_reconf); |
| 2953 | pr_info("SLIM_CL: skip reconfig sequence"); |
| 2954 | return 0; |
| 2955 | } |
| 2956 | } |
| 2957 | |
| 2958 | ctrl->sched.pending_msgsl += sb->pending_msgsl - sb->cur_msgsl; |
| 2959 | list_for_each_entry(pch, &sb->mark_define, pending) { |
| 2960 | struct slim_ich *slc = &ctrl->chans[pch->chan]; |
| 2961 | |
| 2962 | slim_add_ch(ctrl, slc); |
| 2963 | if (slc->state < SLIM_CH_ACTIVE) |
| 2964 | slc->state = SLIM_CH_PENDING_ACTIVE; |
| 2965 | } |
| 2966 | |
| 2967 | list_for_each_entry(pch, &sb->mark_removal, pending) { |
| 2968 | struct slim_ich *slc = &ctrl->chans[pch->chan]; |
| 2969 | u32 sl = slc->seglen << slc->rootexp; |
| 2970 | |
| 2971 | if (slc->coeff == SLIM_COEFF_3) |
| 2972 | sl *= 3; |
| 2973 | if (!ctrl->allocbw) |
| 2974 | ctrl->sched.usedslots -= sl; |
| 2975 | slc->state = SLIM_CH_PENDING_REMOVAL; |
| 2976 | } |
| 2977 | list_for_each_entry(pch, &sb->mark_suspend, pending) { |
| 2978 | struct slim_ich *slc = &ctrl->chans[pch->chan]; |
| 2979 | |
| 2980 | slc->state = SLIM_CH_SUSPENDED; |
| 2981 | } |
| 2982 | |
| 2983 | /* |
| 2984 | * Controller can override default channel scheduling algorithm. |
| 2985 | * (e.g. if controller needs to use fixed channel scheduling based |
| 2986 | * on number of channels) |
| 2987 | */ |
| 2988 | if (ctrl->allocbw) |
| 2989 | ret = ctrl->allocbw(sb, &subframe, &clkgear); |
| 2990 | else |
| 2991 | ret = slim_allocbw(sb, &subframe, &clkgear); |
| 2992 | |
| 2993 | if (!ret) { |
| 2994 | ret = slim_processtxn(ctrl, &txn, false); |
| 2995 | dev_dbg(&ctrl->dev, "sending begin_reconfig:ret:%d\n", ret); |
| 2996 | } |
| 2997 | |
| 2998 | if (!ret && subframe != ctrl->sched.subfrmcode) { |
| 2999 | wbuf[0] = (u8)(subframe & 0xFF); |
| 3000 | txn.mc = SLIM_MSG_MC_NEXT_SUBFRAME_MODE; |
| 3001 | txn.len = 1; |
| 3002 | txn.rl = 4; |
| 3003 | txn.wbuf = wbuf; |
| 3004 | ret = slim_processtxn(ctrl, &txn, false); |
| 3005 | dev_dbg(&ctrl->dev, "sending subframe:%d,ret:%d\n", |
| 3006 | (int)wbuf[0], ret); |
| 3007 | } |
| 3008 | if (!ret && clkgear != ctrl->clkgear) { |
| 3009 | wbuf[0] = (u8)(clkgear & 0xFF); |
| 3010 | txn.mc = SLIM_MSG_MC_NEXT_CLOCK_GEAR; |
| 3011 | txn.len = 1; |
| 3012 | txn.rl = 4; |
| 3013 | txn.wbuf = wbuf; |
| 3014 | ret = slim_processtxn(ctrl, &txn, false); |
| 3015 | dev_dbg(&ctrl->dev, "sending clkgear:%d,ret:%d\n", |
| 3016 | (int)wbuf[0], ret); |
| 3017 | } |
| 3018 | if (ret) |
| 3019 | goto revert_reconfig; |
| 3020 | |
| 3021 | expshft = SLIM_MAX_CLK_GEAR - clkgear; |
| 3022 | /* activate/remove channel */ |
| 3023 | list_for_each_entry(pch, &sb->mark_define, pending) { |
| 3024 | struct slim_ich *slc = &ctrl->chans[pch->chan]; |
| 3025 | /* Define content */ |
| 3026 | wbuf[0] = slc->chan; |
| 3027 | wbuf[1] = slc->prrate; |
| 3028 | wbuf[2] = slc->prop.dataf | (slc->prop.auxf << 4); |
| 3029 | wbuf[3] = slc->prop.sampleszbits / SLIM_CL_PER_SL; |
| 3030 | txn.mc = SLIM_MSG_MC_NEXT_DEFINE_CONTENT; |
| 3031 | txn.len = 4; |
| 3032 | txn.rl = 7; |
| 3033 | txn.wbuf = wbuf; |
| 3034 | dev_dbg(&ctrl->dev, "define content, activate:%x, %x, %x, %x\n", |
| 3035 | wbuf[0], wbuf[1], wbuf[2], wbuf[3]); |
| 3036 | /* Right now, channel link bit is not supported */ |
| 3037 | ret = slim_processtxn(ctrl, &txn, false); |
| 3038 | if (ret) |
| 3039 | goto revert_reconfig; |
| 3040 | |
| 3041 | txn.mc = SLIM_MSG_MC_NEXT_ACTIVATE_CHANNEL; |
| 3042 | txn.len = 1; |
| 3043 | txn.rl = 4; |
| 3044 | ret = slim_processtxn(ctrl, &txn, false); |
| 3045 | if (ret) |
| 3046 | goto revert_reconfig; |
| 3047 | } |
| 3048 | |
| 3049 | list_for_each_entry(pch, &sb->mark_removal, pending) { |
| 3050 | struct slim_ich *slc = &ctrl->chans[pch->chan]; |
| 3051 | |
| 3052 | dev_dbg(&ctrl->dev, "remove chan:%x\n", pch->chan); |
| 3053 | wbuf[0] = slc->chan; |
| 3054 | txn.mc = SLIM_MSG_MC_NEXT_REMOVE_CHANNEL; |
| 3055 | txn.len = 1; |
| 3056 | txn.rl = 4; |
| 3057 | txn.wbuf = wbuf; |
| 3058 | ret = slim_processtxn(ctrl, &txn, false); |
| 3059 | if (ret) |
| 3060 | goto revert_reconfig; |
| 3061 | } |
| 3062 | list_for_each_entry(pch, &sb->mark_suspend, pending) { |
| 3063 | struct slim_ich *slc = &ctrl->chans[pch->chan]; |
| 3064 | |
| 3065 | dev_dbg(&ctrl->dev, "suspend chan:%x\n", pch->chan); |
| 3066 | wbuf[0] = slc->chan; |
| 3067 | txn.mc = SLIM_MSG_MC_NEXT_DEACTIVATE_CHANNEL; |
| 3068 | txn.len = 1; |
| 3069 | txn.rl = 4; |
| 3070 | txn.wbuf = wbuf; |
| 3071 | ret = slim_processtxn(ctrl, &txn, false); |
| 3072 | if (ret) |
| 3073 | goto revert_reconfig; |
| 3074 | } |
| 3075 | |
| 3076 | /* Define CC1 channel */ |
| 3077 | for (i = 0; i < ctrl->sched.num_cc1; i++) { |
| 3078 | struct slim_ich *slc = ctrl->sched.chc1[i]; |
| 3079 | |
| 3080 | if (slc->state == SLIM_CH_PENDING_REMOVAL) |
| 3081 | continue; |
| 3082 | curexp = slc->rootexp + expshft; |
| 3083 | segdist = (slc->newoff << curexp) & 0x1FF; |
| 3084 | expshft = SLIM_MAX_CLK_GEAR - clkgear; |
| 3085 | dev_dbg(&ctrl->dev, "new-intr:%d, old-intr:%d, dist:%d\n", |
| 3086 | slc->newintr, slc->interval, segdist); |
| 3087 | dev_dbg(&ctrl->dev, "new-off:%d, old-off:%d\n", |
| 3088 | slc->newoff, slc->offset); |
| 3089 | |
| 3090 | if (slc->state < SLIM_CH_ACTIVE || slc->def < slc->ref || |
| 3091 | slc->newintr != slc->interval || |
| 3092 | slc->newoff != slc->offset) { |
| 3093 | segdist |= 0x200; |
| 3094 | segdist >>= curexp; |
| 3095 | segdist |= (slc->newoff << (curexp + 1)) & 0xC00; |
| 3096 | wbuf[0] = slc->chan; |
| 3097 | wbuf[1] = (u8)(segdist & 0xFF); |
| 3098 | wbuf[2] = (u8)((segdist & 0xF00) >> 8) | |
| 3099 | (slc->prop.prot << 4); |
| 3100 | wbuf[3] = slc->seglen; |
| 3101 | txn.mc = SLIM_MSG_MC_NEXT_DEFINE_CHANNEL; |
| 3102 | txn.len = 4; |
| 3103 | txn.rl = 7; |
| 3104 | txn.wbuf = wbuf; |
| 3105 | ret = slim_processtxn(ctrl, &txn, false); |
| 3106 | if (ret) |
| 3107 | goto revert_reconfig; |
| 3108 | } |
| 3109 | } |
| 3110 | |
| 3111 | /* Define CC3 channels */ |
| 3112 | for (i = 0; i < ctrl->sched.num_cc3; i++) { |
| 3113 | struct slim_ich *slc = ctrl->sched.chc3[i]; |
| 3114 | |
| 3115 | if (slc->state == SLIM_CH_PENDING_REMOVAL) |
| 3116 | continue; |
| 3117 | curexp = slc->rootexp + expshft; |
| 3118 | segdist = (slc->newoff << curexp) & 0x1FF; |
| 3119 | expshft = SLIM_MAX_CLK_GEAR - clkgear; |
| 3120 | dev_dbg(&ctrl->dev, "new-intr:%d, old-intr:%d, dist:%d\n", |
| 3121 | slc->newintr, slc->interval, segdist); |
| 3122 | dev_dbg(&ctrl->dev, "new-off:%d, old-off:%d\n", |
| 3123 | slc->newoff, slc->offset); |
| 3124 | |
| 3125 | if (slc->state < SLIM_CH_ACTIVE || slc->def < slc->ref || |
| 3126 | slc->newintr != slc->interval || |
| 3127 | slc->newoff != slc->offset) { |
| 3128 | segdist |= 0x200; |
| 3129 | segdist >>= curexp; |
| 3130 | segdist |= 0xC00; |
| 3131 | wbuf[0] = slc->chan; |
| 3132 | wbuf[1] = (u8)(segdist & 0xFF); |
| 3133 | wbuf[2] = (u8)((segdist & 0xF00) >> 8) | |
| 3134 | (slc->prop.prot << 4); |
| 3135 | wbuf[3] = (u8)(slc->seglen); |
| 3136 | txn.mc = SLIM_MSG_MC_NEXT_DEFINE_CHANNEL; |
| 3137 | txn.len = 4; |
| 3138 | txn.rl = 7; |
| 3139 | txn.wbuf = wbuf; |
| 3140 | ret = slim_processtxn(ctrl, &txn, false); |
| 3141 | if (ret) |
| 3142 | goto revert_reconfig; |
| 3143 | } |
| 3144 | } |
| 3145 | txn.mc = SLIM_MSG_MC_RECONFIGURE_NOW; |
| 3146 | txn.len = 0; |
| 3147 | txn.rl = 3; |
| 3148 | txn.wbuf = NULL; |
| 3149 | ret = slim_processtxn(ctrl, &txn, false); |
| 3150 | dev_dbg(&ctrl->dev, "reconfig now:ret:%d\n", ret); |
| 3151 | if (!ret) { |
| 3152 | ctrl->sched.subfrmcode = subframe; |
| 3153 | ctrl->clkgear = clkgear; |
| 3154 | ctrl->sched.msgsl = ctrl->sched.pending_msgsl; |
| 3155 | sb->cur_msgsl = sb->pending_msgsl; |
| 3156 | slim_chan_changes(sb, false); |
| 3157 | mutex_unlock(&ctrl->sched.m_reconf); |
| 3158 | return 0; |
| 3159 | } |
| 3160 | |
| 3161 | revert_reconfig: |
| 3162 | /* Revert channel changes */ |
| 3163 | slim_chan_changes(sb, true); |
| 3164 | mutex_unlock(&ctrl->sched.m_reconf); |
| 3165 | return ret; |
| 3166 | } |
| 3167 | EXPORT_SYMBOL(slim_reconfigure_now); |
| 3168 | |
| 3169 | static int add_pending_ch(struct list_head *listh, u8 chan) |
| 3170 | { |
| 3171 | struct slim_pending_ch *pch; |
| 3172 | |
| 3173 | pch = kmalloc(sizeof(struct slim_pending_ch), GFP_KERNEL); |
| 3174 | if (!pch) |
| 3175 | return -ENOMEM; |
| 3176 | pch->chan = chan; |
| 3177 | list_add_tail(&pch->pending, listh); |
| 3178 | return 0; |
| 3179 | } |
| 3180 | |
| 3181 | /* |
| 3182 | * slim_control_ch: Channel control API. |
| 3183 | * @sb: client handle |
| 3184 | * @chanh: group or channel handle to be controlled |
| 3185 | * @chctrl: Control command (activate/suspend/remove) |
| 3186 | * @commit: flag to indicate whether the control should take effect right-away. |
| 3187 | * This API activates, removes or suspends a channel (or group of channels) |
| 3188 | * chanh indicates the channel or group handle (returned by the define_ch API). |
| 3189 | * Reconfiguration may be time-consuming since it can change all other active |
| 3190 | * channel allocations on the bus, change in clock gear used by the slimbus, |
| 3191 | * and change in the control space width used for messaging. |
| 3192 | * commit makes sure that multiple channels can be activated/deactivated before |
| 3193 | * reconfiguration is started. |
| 3194 | * -EXFULL is returned if there is no space in TDM to reserve the bandwidth. |
| 3195 | * -EISCONN/-ENOTCONN is returned if the channel is already connected or not |
| 3196 | * yet defined. |
| 3197 | * -EINVAL is returned if individual control of a grouped-channel is attempted. |
| 3198 | */ |
| 3199 | int slim_control_ch(struct slim_device *sb, u16 chanh, |
| 3200 | enum slim_ch_control chctrl, bool commit) |
| 3201 | { |
| 3202 | struct slim_controller *ctrl = sb->ctrl; |
| 3203 | int ret = 0; |
| 3204 | /* Get rid of the group flag in MSB if any */ |
| 3205 | u8 chan = SLIM_HDL_TO_CHIDX(chanh); |
| 3206 | u8 nchan = 0; |
| 3207 | struct slim_ich *slc = &ctrl->chans[chan]; |
| 3208 | |
| 3209 | if (!(slc->nextgrp & SLIM_START_GRP)) |
| 3210 | return -EINVAL; |
| 3211 | |
| 3212 | mutex_lock(&sb->sldev_reconf); |
| 3213 | mutex_lock(&ctrl->sched.m_reconf); |
| 3214 | do { |
| 3215 | struct slim_pending_ch *pch; |
| 3216 | u8 add_mark_removal = true; |
| 3217 | |
| 3218 | slc = &ctrl->chans[chan]; |
| 3219 | dev_dbg(&ctrl->dev, "chan:%d,ctrl:%d,def:%d", chan, chctrl, |
| 3220 | slc->def); |
| 3221 | if (slc->state < SLIM_CH_DEFINED) { |
| 3222 | ret = -ENOTCONN; |
| 3223 | break; |
| 3224 | } |
| 3225 | if (chctrl == SLIM_CH_SUSPEND) { |
| 3226 | ret = add_pending_ch(&sb->mark_suspend, chan); |
| 3227 | if (ret) |
| 3228 | break; |
| 3229 | } else if (chctrl == SLIM_CH_ACTIVATE) { |
| 3230 | if (slc->state > SLIM_CH_ACTIVE) { |
| 3231 | ret = -EISCONN; |
| 3232 | break; |
| 3233 | } |
| 3234 | ret = add_pending_ch(&sb->mark_define, chan); |
| 3235 | if (ret) |
| 3236 | break; |
| 3237 | } else { |
| 3238 | if (slc->state < SLIM_CH_ACTIVE) { |
| 3239 | ret = -ENOTCONN; |
| 3240 | break; |
| 3241 | } |
| 3242 | /* If channel removal request comes when pending |
| 3243 | * in the mark_define, remove it from the define |
| 3244 | * list instead of adding it to removal list |
| 3245 | */ |
| 3246 | if (!list_empty(&sb->mark_define)) { |
| 3247 | struct list_head *pos, *next; |
| 3248 | |
| 3249 | list_for_each_safe(pos, next, |
| 3250 | &sb->mark_define) { |
| 3251 | pch = list_entry(pos, |
| 3252 | struct slim_pending_ch, |
| 3253 | pending); |
| 3254 | if (pch->chan == chan) { |
| 3255 | list_del(&pch->pending); |
| 3256 | kfree(pch); |
| 3257 | add_mark_removal = false; |
| 3258 | break; |
| 3259 | } |
| 3260 | } |
| 3261 | } |
| 3262 | if (add_mark_removal == true) { |
| 3263 | ret = add_pending_ch(&sb->mark_removal, chan); |
| 3264 | if (ret) |
| 3265 | break; |
| 3266 | } |
| 3267 | } |
| 3268 | |
| 3269 | nchan++; |
| 3270 | if (nchan < SLIM_GRP_TO_NCHAN(chanh)) |
| 3271 | chan = SLIM_HDL_TO_CHIDX(slc->nextgrp); |
| 3272 | } while (nchan < SLIM_GRP_TO_NCHAN(chanh)); |
| 3273 | mutex_unlock(&ctrl->sched.m_reconf); |
| 3274 | if (!ret && commit == true) |
| 3275 | ret = slim_reconfigure_now(sb); |
| 3276 | mutex_unlock(&sb->sldev_reconf); |
| 3277 | return ret; |
| 3278 | } |
| 3279 | EXPORT_SYMBOL(slim_control_ch); |
| 3280 | |
| 3281 | /* |
| 3282 | * slim_reservemsg_bw: Request to reserve bandwidth for messages. |
| 3283 | * @sb: client handle |
| 3284 | * @bw_bps: message bandwidth in bits per second to be requested |
| 3285 | * @commit: indicates whether the reconfiguration needs to be acted upon. |
| 3286 | * This API call can be grouped with slim_control_ch API call with only one of |
| 3287 | * the APIs specifying the commit flag to avoid reconfiguration being called too |
| 3288 | * frequently. -EXFULL is returned if there is no space in TDM to reserve the |
| 3289 | * bandwidth. -EBUSY is returned if reconfiguration is requested, but a request |
| 3290 | * is already in progress. |
| 3291 | */ |
| 3292 | int slim_reservemsg_bw(struct slim_device *sb, u32 bw_bps, bool commit) |
| 3293 | { |
| 3294 | struct slim_controller *ctrl = sb->ctrl; |
| 3295 | int ret = 0; |
| 3296 | int sl; |
| 3297 | |
| 3298 | mutex_lock(&sb->sldev_reconf); |
| 3299 | if ((bw_bps >> 3) >= ctrl->a_framer->rootfreq) |
| 3300 | sl = SLIM_SL_PER_SUPERFRAME; |
| 3301 | else { |
| 3302 | sl = (bw_bps * (SLIM_CL_PER_SUPERFRAME_DIV8/SLIM_CL_PER_SL/2) + |
| 3303 | (ctrl->a_framer->rootfreq/2 - 1)) / |
| 3304 | (ctrl->a_framer->rootfreq/2); |
| 3305 | } |
| 3306 | dev_dbg(&ctrl->dev, "request:bw:%d, slots:%d, current:%d\n", bw_bps, sl, |
| 3307 | sb->cur_msgsl); |
| 3308 | sb->pending_msgsl = sl; |
| 3309 | if (commit == true) |
| 3310 | ret = slim_reconfigure_now(sb); |
| 3311 | mutex_unlock(&sb->sldev_reconf); |
| 3312 | return ret; |
| 3313 | } |
| 3314 | EXPORT_SYMBOL(slim_reservemsg_bw); |
| 3315 | |
| 3316 | /* |
| 3317 | * slim_ctrl_clk_pause: Called by slimbus controller to request clock to be |
| 3318 | * paused or woken up out of clock pause |
| 3319 | * or woken up from clock pause |
| 3320 | * @ctrl: controller requesting bus to be paused or woken up |
| 3321 | * @wakeup: Wakeup this controller from clock pause. |
| 3322 | * @restart: Restart time value per spec used for clock pause. This value |
| 3323 | * isn't used when controller is to be woken up. |
| 3324 | * This API executes clock pause reconfiguration sequence if wakeup is false. |
| 3325 | * If wakeup is true, controller's wakeup is called |
| 3326 | * Slimbus clock is idle and can be disabled by the controller later. |
| 3327 | */ |
| 3328 | int slim_ctrl_clk_pause(struct slim_controller *ctrl, bool wakeup, u8 restart) |
| 3329 | { |
| 3330 | int ret = 0; |
| 3331 | int i; |
| 3332 | DEFINE_SLIM_BCAST_TXN(txn, SLIM_MSG_CLK_PAUSE_SEQ_FLG | |
| 3333 | SLIM_MSG_MC_BEGIN_RECONFIGURATION, 0, 3, |
| 3334 | NULL, NULL, 0); |
| 3335 | |
| 3336 | if (wakeup == false && restart > SLIM_CLK_UNSPECIFIED) |
| 3337 | return -EINVAL; |
| 3338 | mutex_lock(&ctrl->m_ctrl); |
| 3339 | if (wakeup) { |
| 3340 | if (ctrl->clk_state == SLIM_CLK_ACTIVE) { |
| 3341 | mutex_unlock(&ctrl->m_ctrl); |
| 3342 | return 0; |
| 3343 | } |
| 3344 | wait_for_completion(&ctrl->pause_comp); |
| 3345 | /* |
| 3346 | * Slimbus framework will call controller wakeup |
| 3347 | * Controller should make sure that it sets active framer |
| 3348 | * out of clock pause by doing appropriate setting |
| 3349 | */ |
| 3350 | if (ctrl->clk_state == SLIM_CLK_PAUSED && ctrl->wakeup) |
| 3351 | ret = ctrl->wakeup(ctrl); |
| 3352 | /* |
| 3353 | * If wakeup fails, make sure that next attempt can succeed. |
| 3354 | * Since we already consumed pause_comp, complete it so |
| 3355 | * that next wakeup isn't blocked forever |
| 3356 | */ |
| 3357 | if (!ret) |
| 3358 | ctrl->clk_state = SLIM_CLK_ACTIVE; |
| 3359 | else |
| 3360 | complete(&ctrl->pause_comp); |
| 3361 | mutex_unlock(&ctrl->m_ctrl); |
| 3362 | return ret; |
| 3363 | } |
| 3364 | |
| 3365 | switch (ctrl->clk_state) { |
| 3366 | case SLIM_CLK_ENTERING_PAUSE: |
| 3367 | case SLIM_CLK_PAUSE_FAILED: |
| 3368 | /* |
| 3369 | * If controller is already trying to enter clock pause, |
| 3370 | * let it finish. |
| 3371 | * In case of error, retry |
| 3372 | * In both cases, previous clock pause has signalled |
| 3373 | * completion. |
| 3374 | */ |
| 3375 | wait_for_completion(&ctrl->pause_comp); |
| 3376 | /* retry upon failure */ |
| 3377 | if (ctrl->clk_state == SLIM_CLK_PAUSE_FAILED) { |
| 3378 | ctrl->clk_state = SLIM_CLK_ACTIVE; |
| 3379 | } else { |
| 3380 | mutex_unlock(&ctrl->m_ctrl); |
| 3381 | /* |
| 3382 | * Signal completion so that wakeup can wait on |
| 3383 | * it. |
| 3384 | */ |
| 3385 | complete(&ctrl->pause_comp); |
| 3386 | return 0; |
| 3387 | } |
| 3388 | break; |
| 3389 | case SLIM_CLK_PAUSED: |
| 3390 | /* already paused */ |
| 3391 | mutex_unlock(&ctrl->m_ctrl); |
| 3392 | return 0; |
| 3393 | case SLIM_CLK_ACTIVE: |
| 3394 | default: |
| 3395 | break; |
| 3396 | } |
| 3397 | /* Pending response for a message */ |
| 3398 | for (i = 0; i < ctrl->last_tid; i++) { |
| 3399 | if (ctrl->txnt[i]) { |
| 3400 | ret = -EBUSY; |
| 3401 | pr_info("slim_clk_pause: txn-rsp for %d pending", i); |
| 3402 | mutex_unlock(&ctrl->m_ctrl); |
| 3403 | return -EBUSY; |
| 3404 | } |
| 3405 | } |
| 3406 | ctrl->clk_state = SLIM_CLK_ENTERING_PAUSE; |
| 3407 | mutex_unlock(&ctrl->m_ctrl); |
| 3408 | |
| 3409 | mutex_lock(&ctrl->sched.m_reconf); |
| 3410 | /* Data channels active */ |
| 3411 | if (ctrl->sched.usedslots) { |
| 3412 | pr_info("slim_clk_pause: data channel active"); |
| 3413 | ret = -EBUSY; |
| 3414 | goto clk_pause_ret; |
| 3415 | } |
| 3416 | |
| 3417 | ret = slim_processtxn(ctrl, &txn, false); |
| 3418 | if (ret) |
| 3419 | goto clk_pause_ret; |
| 3420 | |
| 3421 | txn.mc = SLIM_MSG_CLK_PAUSE_SEQ_FLG | SLIM_MSG_MC_NEXT_PAUSE_CLOCK; |
| 3422 | txn.len = 1; |
| 3423 | txn.rl = 4; |
| 3424 | txn.wbuf = &restart; |
| 3425 | ret = slim_processtxn(ctrl, &txn, false); |
| 3426 | if (ret) |
| 3427 | goto clk_pause_ret; |
| 3428 | |
| 3429 | txn.mc = SLIM_MSG_CLK_PAUSE_SEQ_FLG | SLIM_MSG_MC_RECONFIGURE_NOW; |
| 3430 | txn.len = 0; |
| 3431 | txn.rl = 3; |
| 3432 | txn.wbuf = NULL; |
| 3433 | ret = slim_processtxn(ctrl, &txn, false); |
| 3434 | if (ret) |
| 3435 | goto clk_pause_ret; |
| 3436 | |
| 3437 | clk_pause_ret: |
| 3438 | if (ret) |
| 3439 | ctrl->clk_state = SLIM_CLK_PAUSE_FAILED; |
| 3440 | else |
| 3441 | ctrl->clk_state = SLIM_CLK_PAUSED; |
| 3442 | complete(&ctrl->pause_comp); |
| 3443 | mutex_unlock(&ctrl->sched.m_reconf); |
| 3444 | return ret; |
| 3445 | } |
| 3446 | EXPORT_SYMBOL(slim_ctrl_clk_pause); |
| 3447 | |
| 3448 | MODULE_LICENSE("GPL v2"); |
| 3449 | MODULE_DESCRIPTION("Slimbus module"); |
| 3450 | MODULE_ALIAS("platform:slimbus"); |