Sundara Vinayagam | a2356d2 | 2018-05-21 13:39:39 +0530 | [diff] [blame] | 1 | /* Copyright (c) 2017-2018, The Linux Foundation.All rights reserved. |
| 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 | #include <linux/kernel.h> |
| 13 | #include <linux/module.h> |
| 14 | #include <linux/types.h> |
| 15 | #include <linux/slab.h> |
| 16 | #include <linux/uaccess.h> |
| 17 | #include <linux/of.h> |
| 18 | #include <linux/mutex.h> |
| 19 | #include <soc/bg_glink.h> |
| 20 | #include <linux/wait.h> |
| 21 | #include <linux/errno.h> |
| 22 | #include <linux/debugfs.h> |
| 23 | #include <linux/platform_device.h> |
| 24 | #include <linux/delay.h> |
| 25 | #include <soc/qcom/glink.h> |
| 26 | |
| 27 | #define GLINK_LINK_STATE_UP_WAIT_TIMEOUT 5000 |
| 28 | #define APR_MAXIMUM_NUM_OF_RETRIES 2 |
| 29 | #define BG_RX_INTENT_REQ_TIMEOUT_MS 3000 |
| 30 | #define BG_GLINK_NAME "bg-cdc-glink" |
| 31 | #define BG_GLINK_EDGE "bg" |
| 32 | #define BG_MAX_NO_OF_INTENTS 20 |
| 33 | |
| 34 | struct bg_cdc_glink_drvdata { |
| 35 | struct device *dev; |
| 36 | struct platform_device *pdev; |
| 37 | struct bg_cdc_glink_ch_info *ch_info; |
| 38 | void *handle; |
| 39 | wait_queue_head_t wait; |
| 40 | u8 num_channels; |
| 41 | u8 active_channel; |
| 42 | enum glink_link_state link_state; |
| 43 | }; |
| 44 | |
| 45 | struct bg_cdc_glink_ch_info { |
| 46 | void *handle; |
| 47 | struct mutex w_lock; |
| 48 | struct mutex r_lock; |
| 49 | struct mutex m_lock; |
| 50 | bg_glink_cb_fn func; |
| 51 | wait_queue_head_t wait; |
| 52 | unsigned channel_state; |
| 53 | bool if_remote_intent_ready; |
| 54 | }; |
| 55 | static int __bg_cdc_glink_write(struct bg_cdc_glink_ch_info *ch_info, |
| 56 | void *data, char *tx_buf, int len) |
| 57 | { |
| 58 | int rc = 0; |
| 59 | |
| 60 | if (!ch_info) |
| 61 | return -EINVAL; |
| 62 | mutex_lock(&ch_info->w_lock); |
| 63 | rc = glink_tx(ch_info->handle, tx_buf, data, len, GLINK_TX_REQ_INTENT); |
| 64 | mutex_unlock(&ch_info->w_lock); |
| 65 | |
| 66 | if (rc) |
| 67 | pr_err("%s: glink_tx failed, rc[%d]\n", __func__, rc); |
| 68 | else |
| 69 | rc = len; |
| 70 | |
| 71 | return rc; |
| 72 | } |
| 73 | |
| 74 | int bg_cdc_glink_write(void *ch_info, void *data, |
| 75 | int len) |
| 76 | { |
| 77 | int rc = 0; |
| 78 | char *tx_buf = NULL; |
| 79 | |
| 80 | if (!((struct bg_cdc_glink_ch_info *)ch_info)->handle || !data) |
| 81 | return -EINVAL; |
| 82 | |
| 83 | /* check if channel is connected before proceeding */ |
| 84 | if (((struct bg_cdc_glink_ch_info *)ch_info)->channel_state |
| 85 | != GLINK_CONNECTED) { |
| 86 | pr_err("%s: channel is not connected\n", __func__); |
| 87 | return -EINVAL; |
| 88 | } |
| 89 | |
| 90 | tx_buf = kzalloc((sizeof(char) * len), GFP_KERNEL); |
| 91 | if (IS_ERR_OR_NULL(tx_buf)) { |
| 92 | rc = -EINVAL; |
| 93 | goto exit; |
| 94 | } |
| 95 | memcpy(tx_buf, data, len); |
| 96 | |
| 97 | rc = __bg_cdc_glink_write((struct bg_cdc_glink_ch_info *)ch_info, |
| 98 | tx_buf, tx_buf, len); |
| 99 | |
| 100 | if (rc < 0) { |
| 101 | pr_err("%s: Unable to send the packet, rc:%d\n", __func__, rc); |
| 102 | kfree(tx_buf); |
| 103 | } |
| 104 | exit: |
| 105 | return rc; |
| 106 | } |
| 107 | EXPORT_SYMBOL(bg_cdc_glink_write); |
| 108 | |
| 109 | static void bg_cdc_glink_notify_rx(void *handle, const void *priv, |
| 110 | const void *pkt_priv, const void *ptr, |
| 111 | size_t size) |
| 112 | { |
| 113 | struct bg_cdc_glink_ch_info *ch_info = |
| 114 | (struct bg_cdc_glink_ch_info *)priv; |
| 115 | |
| 116 | if (!ch_info || !ptr) { |
| 117 | pr_err("%s: Invalid ch_info or ptr\n", __func__); |
| 118 | return; |
| 119 | } |
| 120 | |
| 121 | pr_debug("%s: Rx packet received\n", __func__); |
| 122 | |
| 123 | mutex_lock(&ch_info->r_lock); |
| 124 | if (ch_info->func) |
| 125 | ch_info->func((void *)ptr, size); |
| 126 | mutex_unlock(&ch_info->r_lock); |
| 127 | glink_rx_done(ch_info->handle, ptr, true); |
| 128 | } |
| 129 | |
| 130 | static void bg_cdc_glink_notify_tx_abort(void *handle, const void *priv, |
| 131 | const void *pkt_priv) |
| 132 | { |
| 133 | pr_debug("%s: tx_abort received for pkt_priv:%pK\n", |
| 134 | __func__, pkt_priv); |
| 135 | kfree(pkt_priv); |
| 136 | } |
| 137 | |
| 138 | static void bg_cdc_glink_notify_tx_done(void *handle, const void *priv, |
| 139 | const void *pkt_priv, const void *ptr) |
| 140 | { |
| 141 | pr_debug("%s: tx_done received for pkt_priv:%pK\n", |
| 142 | __func__, pkt_priv); |
| 143 | kfree(pkt_priv); |
| 144 | } |
| 145 | |
| 146 | static bool bg_cdc_glink_notify_rx_intent_req(void *handle, const void *priv, |
| 147 | size_t req_size) |
| 148 | { |
| 149 | struct bg_cdc_glink_ch_info *ch_info = |
| 150 | (struct bg_cdc_glink_ch_info *)priv; |
| 151 | |
| 152 | if (!ch_info) { |
| 153 | pr_err("%s: Invalid ch_info\n", __func__); |
| 154 | return false; |
| 155 | } |
| 156 | |
| 157 | pr_debug("%s: No rx intents queued, unable to receive\n", __func__); |
| 158 | return false; |
| 159 | } |
| 160 | |
| 161 | static void bg_cdc_glink_notify_remote_rx_intent(void *handle, const void *priv, |
| 162 | size_t size) |
| 163 | { |
| 164 | struct bg_cdc_glink_ch_info *ch_info = |
| 165 | (struct bg_cdc_glink_ch_info *)priv; |
| 166 | |
| 167 | if (!ch_info) { |
| 168 | pr_err("%s: Invalid ch_info\n", __func__); |
| 169 | return; |
| 170 | } |
| 171 | /* |
| 172 | * This is to make sure that the far end has queued at least one intent |
| 173 | * before we attempt any IPC. |
| 174 | */ |
| 175 | pr_debug("%s: remote queued an intent\n", __func__); |
| 176 | ch_info->if_remote_intent_ready = true; |
| 177 | wake_up(&ch_info->wait); |
| 178 | } |
| 179 | |
| 180 | static void bg_cdc_glink_notify_state(void *handle, const void *priv, |
| 181 | unsigned event) |
| 182 | { |
| 183 | struct bg_cdc_glink_ch_info *ch_info = |
| 184 | (struct bg_cdc_glink_ch_info *)priv; |
| 185 | |
| 186 | if (!ch_info) { |
| 187 | pr_err("%s: Invalid ch_info\n", __func__); |
| 188 | return; |
| 189 | } |
| 190 | |
| 191 | ch_info->channel_state = event; |
| 192 | pr_debug("%s: Channel state[%d]\n", __func__, event); |
| 193 | |
| 194 | if (event == GLINK_CONNECTED) |
| 195 | wake_up(&ch_info->wait); |
| 196 | } |
| 197 | |
| 198 | static int bg_cdc_glink_rx_intents_config(struct bg_cdc_glink_ch_info *ch_info, |
| 199 | int num_of_intents, uint32_t *size) |
| 200 | { |
| 201 | int i; |
| 202 | int rc = 0; |
| 203 | |
| 204 | if (!ch_info || !num_of_intents || !size) { |
| 205 | pr_err("%s: Invalid parameter\n", __func__); |
| 206 | return -EINVAL; |
| 207 | } |
| 208 | if (num_of_intents > BG_MAX_NO_OF_INTENTS) { |
| 209 | pr_err("%s: Invalid no_of_intents = %d\n", |
| 210 | __func__, num_of_intents); |
| 211 | return -EINVAL; |
| 212 | } |
| 213 | |
| 214 | for (i = 0; i < num_of_intents; i++) { |
| 215 | rc = glink_queue_rx_intent(ch_info->handle, ch_info, *(size+i)); |
| 216 | if (rc) { |
| 217 | pr_err("%s: Failed to queue rx intent, iteration[%d]\n", |
| 218 | __func__, i); |
| 219 | break; |
| 220 | } |
| 221 | } |
| 222 | |
| 223 | return rc; |
| 224 | } |
| 225 | /* |
| 226 | * bg_cdc_channel_open - API to open Glink channel. |
| 227 | * ch_cfg: glink channel configuration |
| 228 | * func: callback function to notify client. |
| 229 | */ |
| 230 | void *bg_cdc_channel_open(struct platform_device *pdev, |
| 231 | struct bg_glink_ch_cfg *ch_cfg, |
| 232 | bg_glink_cb_fn func) |
| 233 | { |
| 234 | int rc; |
| 235 | struct bg_cdc_glink_drvdata *bg_cdc_glink; |
| 236 | struct glink_open_config open_cfg; |
| 237 | struct bg_cdc_glink_ch_info *ch_info; |
| 238 | |
| 239 | if (!pdev) { |
| 240 | pr_err("%s: invalid platform device\n",__func__); |
| 241 | return NULL; |
| 242 | } |
| 243 | bg_cdc_glink = platform_get_drvdata(pdev); |
| 244 | |
| 245 | if (!bg_cdc_glink) { |
| 246 | dev_err(&pdev->dev, "%s: driver data not found\n", |
| 247 | __func__); |
| 248 | return NULL; |
| 249 | } |
| 250 | if (bg_cdc_glink->active_channel > bg_cdc_glink->num_channels) { |
| 251 | dev_err(bg_cdc_glink->dev, "%s: invalid channel number\n", |
| 252 | __func__); |
| 253 | return NULL; |
| 254 | } |
| 255 | |
| 256 | ch_info = &bg_cdc_glink->ch_info[bg_cdc_glink->active_channel]; |
| 257 | mutex_lock(&ch_info->m_lock); |
| 258 | if (ch_info->handle) { |
| 259 | dev_err(&pdev->dev, "%s: This channel is already opened\n", |
| 260 | __func__); |
| 261 | rc = -EBUSY; |
| 262 | goto unlock; |
| 263 | } |
| 264 | |
| 265 | if (bg_cdc_glink->link_state != GLINK_LINK_STATE_UP) { |
| 266 | rc = wait_event_timeout(bg_cdc_glink->wait, |
| 267 | bg_cdc_glink->link_state == GLINK_LINK_STATE_UP, |
| 268 | msecs_to_jiffies(GLINK_LINK_STATE_UP_WAIT_TIMEOUT)); |
| 269 | if (rc == 0) { |
| 270 | dev_err(bg_cdc_glink->dev, "%s: Open timeout\n", |
| 271 | __func__); |
| 272 | rc = -ETIMEDOUT; |
| 273 | goto unlock; |
| 274 | } |
| 275 | dev_dbg(bg_cdc_glink->dev, "%s: Wakeup done\n", __func__); |
| 276 | } |
| 277 | |
| 278 | memset(&open_cfg, 0, sizeof(struct glink_open_config)); |
| 279 | open_cfg.options = GLINK_OPT_INITIAL_XPORT; |
| 280 | open_cfg.edge = BG_GLINK_EDGE; |
| 281 | open_cfg.name = ch_cfg->ch_name; |
| 282 | open_cfg.notify_rx = bg_cdc_glink_notify_rx; |
| 283 | open_cfg.notify_tx_done = bg_cdc_glink_notify_tx_done; |
| 284 | open_cfg.notify_state = bg_cdc_glink_notify_state; |
| 285 | open_cfg.notify_rx_intent_req = bg_cdc_glink_notify_rx_intent_req; |
| 286 | open_cfg.notify_remote_rx_intent = bg_cdc_glink_notify_remote_rx_intent; |
| 287 | open_cfg.notify_tx_abort = bg_cdc_glink_notify_tx_abort; |
| 288 | open_cfg.rx_intent_req_timeout_ms = BG_RX_INTENT_REQ_TIMEOUT_MS; |
| 289 | open_cfg.priv = ch_info; |
| 290 | |
| 291 | ch_info->channel_state = GLINK_REMOTE_DISCONNECTED; |
| 292 | ch_info->handle = glink_open(&open_cfg); |
| 293 | if (IS_ERR_OR_NULL(ch_info->handle)) { |
| 294 | dev_err(bg_cdc_glink->dev, "%s: glink_open failed %s\n", |
| 295 | __func__, ch_cfg->ch_name); |
| 296 | ch_info->handle = NULL; |
| 297 | rc = -EINVAL; |
| 298 | goto unlock; |
| 299 | } |
| 300 | bg_cdc_glink->active_channel++; |
| 301 | rc = wait_event_timeout(ch_info->wait, |
| 302 | (ch_info->channel_state == GLINK_CONNECTED), 5 * HZ); |
| 303 | if (rc == 0) { |
| 304 | dev_err(bg_cdc_glink->dev, "%s: TIMEOUT for OPEN event\n", |
| 305 | __func__); |
| 306 | rc = -ETIMEDOUT; |
| 307 | goto close_link; |
| 308 | } |
| 309 | rc = bg_cdc_glink_rx_intents_config(ch_info, |
| 310 | ch_cfg->num_of_intents, ch_cfg->intents_size); |
| 311 | if (rc) { |
| 312 | dev_err(bg_cdc_glink->dev, "%s: Unable to queue intents\n", |
| 313 | __func__); |
| 314 | goto close_link; |
| 315 | } |
| 316 | |
| 317 | ch_info->func = func; |
| 318 | |
| 319 | close_link: |
| 320 | if (rc) { |
| 321 | if (bg_cdc_glink->active_channel > 0) |
| 322 | bg_cdc_glink->active_channel--; |
| 323 | glink_close(ch_info->handle); |
| 324 | ch_info->handle = NULL; |
| 325 | } |
| 326 | unlock: |
| 327 | mutex_unlock(&ch_info->m_lock); |
| 328 | |
| 329 | return rc ? NULL : (void *)ch_info; |
| 330 | } |
| 331 | EXPORT_SYMBOL(bg_cdc_channel_open); |
| 332 | |
| 333 | |
| 334 | int bg_cdc_channel_close(struct platform_device *pdev, |
| 335 | void *ch_info) |
| 336 | { |
| 337 | struct bg_cdc_glink_drvdata *bg_cdc_glink; |
| 338 | int rc; |
| 339 | struct bg_cdc_glink_ch_info *channel_info |
| 340 | = (struct bg_cdc_glink_ch_info *)ch_info; |
| 341 | bg_cdc_glink = platform_get_drvdata(pdev); |
| 342 | if (!channel_info || !channel_info->handle) { |
| 343 | rc = -EINVAL; |
| 344 | goto exit; |
| 345 | } |
| 346 | |
| 347 | mutex_lock(&channel_info->m_lock); |
| 348 | if (bg_cdc_glink->active_channel > 0) |
| 349 | bg_cdc_glink->active_channel--; |
| 350 | rc = glink_close(channel_info->handle); |
| 351 | channel_info->handle = NULL; |
| 352 | channel_info->func = NULL; |
| 353 | channel_info->if_remote_intent_ready = false; |
| 354 | mutex_unlock(&channel_info->m_lock); |
| 355 | exit: |
| 356 | return rc; |
| 357 | } |
| 358 | EXPORT_SYMBOL(bg_cdc_channel_close); |
| 359 | |
| 360 | static void bg_cdc_glink_link_state_cb(struct glink_link_state_cb_info *cb_info, |
| 361 | void *priv) |
| 362 | { |
| 363 | struct bg_cdc_glink_drvdata *bg_cdc_glink = |
| 364 | (struct bg_cdc_glink_drvdata *) priv; |
| 365 | |
| 366 | if (!cb_info) { |
| 367 | pr_err("%s: Invalid cb_info\n", __func__); |
| 368 | return; |
| 369 | } |
| 370 | |
| 371 | dev_dbg(bg_cdc_glink->dev, "%s: edge[%s] link state[%d]\n", __func__, |
| 372 | cb_info->edge, cb_info->link_state); |
| 373 | |
| 374 | bg_cdc_glink->link_state = cb_info->link_state; |
| 375 | if (bg_cdc_glink->link_state == GLINK_LINK_STATE_UP) |
| 376 | wake_up(&bg_cdc_glink->wait); |
| 377 | } |
| 378 | |
| 379 | static int bg_cdc_glink_probe(struct platform_device *pdev) |
| 380 | { |
| 381 | struct bg_cdc_glink_drvdata *bg_cdc_glink; |
| 382 | struct glink_link_info link_info; |
| 383 | u32 num_channels; |
| 384 | int ret = 0; |
| 385 | int i; |
| 386 | |
| 387 | ret = of_property_read_u32(pdev->dev.of_node, "qcom,msm-glink-channels", |
| 388 | &num_channels); |
| 389 | |
| 390 | if (ret) { |
| 391 | dev_err(&pdev->dev, "%s: glink channels from DT file %s\n", |
| 392 | __func__, "qcom,msm-glink-channels"); |
| 393 | return -EINVAL; |
| 394 | } |
| 395 | |
| 396 | /* Allocate BG codec Glink structure */ |
| 397 | bg_cdc_glink = kzalloc(sizeof(struct bg_cdc_glink_drvdata), GFP_KERNEL); |
| 398 | if (!bg_cdc_glink) |
| 399 | return -ENOMEM; |
| 400 | |
| 401 | bg_cdc_glink->ch_info = kzalloc((sizeof(struct bg_cdc_glink_ch_info) * |
| 402 | num_channels), GFP_KERNEL); |
| 403 | if (!bg_cdc_glink->ch_info) { |
| 404 | ret = -ENOMEM; |
| 405 | goto err_memory_fail; |
| 406 | } |
| 407 | bg_cdc_glink->dev = &pdev->dev; |
| 408 | bg_cdc_glink->pdev = pdev; |
| 409 | bg_cdc_glink->num_channels = num_channels; |
| 410 | platform_set_drvdata(pdev, bg_cdc_glink); |
| 411 | |
| 412 | init_waitqueue_head(&bg_cdc_glink->wait); |
| 413 | |
| 414 | /* Register glink link_state notification */ |
| 415 | link_info.glink_link_state_notif_cb = bg_cdc_glink_link_state_cb; |
| 416 | link_info.transport = NULL; |
| 417 | link_info.edge = BG_GLINK_EDGE; |
| 418 | bg_cdc_glink->link_state = GLINK_LINK_STATE_DOWN; |
| 419 | bg_cdc_glink->handle = |
| 420 | glink_register_link_state_cb(&link_info, bg_cdc_glink); |
| 421 | if (!bg_cdc_glink->handle) { |
| 422 | dev_err(&pdev->dev, "%s: Unable to register link state\n", |
| 423 | __func__); |
| 424 | ret = -EINVAL; |
| 425 | goto err_glink_register_fail; |
| 426 | } |
| 427 | |
| 428 | for (i = 0; i < num_channels; i++) { |
| 429 | mutex_init(&bg_cdc_glink->ch_info[i].w_lock); |
| 430 | mutex_init(&bg_cdc_glink->ch_info[i].r_lock); |
| 431 | mutex_init(&bg_cdc_glink->ch_info[i].m_lock); |
| 432 | init_waitqueue_head(&bg_cdc_glink->ch_info[i].wait); |
| 433 | } |
| 434 | return ret; |
| 435 | err_glink_register_fail: |
| 436 | kfree(bg_cdc_glink->ch_info); |
| 437 | |
| 438 | err_memory_fail: |
| 439 | kfree(bg_cdc_glink); |
| 440 | |
| 441 | return ret; |
| 442 | } |
| 443 | |
| 444 | static const struct of_device_id bg_cdc_glink_of_match[] = { |
| 445 | { .compatible = "qcom,bg-cdc-glink", }, |
| 446 | {}, |
| 447 | }; |
| 448 | |
| 449 | static int bg_cdc_glink_remove(struct platform_device *pdev) |
| 450 | { |
| 451 | struct bg_cdc_glink_drvdata *bg_cdc_glink = platform_get_drvdata(pdev); |
| 452 | int i; |
| 453 | |
| 454 | if (!bg_cdc_glink) { |
| 455 | dev_err(&pdev->dev, "%s: invalid data\n", |
| 456 | __func__); |
| 457 | return -EINVAL; |
| 458 | } |
| 459 | if (bg_cdc_glink->handle) |
| 460 | glink_unregister_link_state_cb(bg_cdc_glink->handle); |
| 461 | |
| 462 | for (i = 0; i < bg_cdc_glink->num_channels; i++) { |
| 463 | mutex_destroy(&bg_cdc_glink->ch_info[i].w_lock); |
| 464 | mutex_destroy(&bg_cdc_glink->ch_info[i].r_lock); |
| 465 | mutex_destroy(&bg_cdc_glink->ch_info[i].m_lock); |
| 466 | } |
| 467 | kfree(bg_cdc_glink->ch_info); |
| 468 | kfree(bg_cdc_glink); |
| 469 | return 0; |
| 470 | } |
| 471 | |
| 472 | static struct platform_driver msm_bg_cdc_glink_driver = { |
| 473 | .driver = { |
| 474 | .owner = THIS_MODULE, |
| 475 | .name = BG_GLINK_NAME, |
| 476 | .of_match_table = bg_cdc_glink_of_match, |
| 477 | }, |
| 478 | .probe = bg_cdc_glink_probe, |
| 479 | .remove = bg_cdc_glink_remove, |
| 480 | }; |
| 481 | module_platform_driver(msm_bg_cdc_glink_driver); |
| 482 | |
| 483 | MODULE_LICENSE("GPL v2"); |
| 484 | MODULE_DESCRIPTION("BG Glink driver"); |