Kai Vehmanen | 7f62fe8 | 2010-06-02 22:23:34 +0300 | [diff] [blame] | 1 | /* |
| 2 | * cmt_speech.c - HSI CMT speech driver |
| 3 | * |
| 4 | * Copyright (C) 2008,2009,2010 Nokia Corporation. All rights reserved. |
| 5 | * |
| 6 | * Contact: Kai Vehmanen <kai.vehmanen@nokia.com> |
| 7 | * Original author: Peter Ujfalusi <peter.ujfalusi@nokia.com> |
| 8 | * |
| 9 | * This program is free software; you can redistribute it and/or |
| 10 | * modify it under the terms of the GNU General Public License |
| 11 | * version 2 as published by the Free Software Foundation. |
| 12 | * |
| 13 | * This program is distributed in the hope that it will be useful, but |
| 14 | * WITHOUT ANY WARRANTY; without even the implied warranty of |
| 15 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
| 16 | * General Public License for more details. |
| 17 | * |
| 18 | * You should have received a copy of the GNU General Public License |
| 19 | * along with this program; if not, write to the Free Software |
| 20 | * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA |
| 21 | * 02110-1301 USA |
| 22 | */ |
| 23 | |
| 24 | #include <linux/errno.h> |
| 25 | #include <linux/module.h> |
| 26 | #include <linux/types.h> |
| 27 | #include <linux/init.h> |
| 28 | #include <linux/device.h> |
| 29 | #include <linux/miscdevice.h> |
| 30 | #include <linux/mm.h> |
| 31 | #include <linux/slab.h> |
| 32 | #include <linux/fs.h> |
| 33 | #include <linux/poll.h> |
| 34 | #include <linux/sched.h> |
| 35 | #include <linux/ioctl.h> |
| 36 | #include <linux/uaccess.h> |
| 37 | #include <linux/pm_qos.h> |
| 38 | #include <linux/hsi/hsi.h> |
| 39 | #include <linux/hsi/ssi_protocol.h> |
| 40 | #include <linux/hsi/cs-protocol.h> |
| 41 | |
| 42 | #define CS_MMAP_SIZE PAGE_SIZE |
| 43 | |
| 44 | struct char_queue { |
| 45 | struct list_head list; |
| 46 | u32 msg; |
| 47 | }; |
| 48 | |
| 49 | struct cs_char { |
| 50 | unsigned int opened; |
| 51 | struct hsi_client *cl; |
| 52 | struct cs_hsi_iface *hi; |
| 53 | struct list_head chardev_queue; |
| 54 | struct list_head dataind_queue; |
| 55 | int dataind_pending; |
| 56 | /* mmap things */ |
| 57 | unsigned long mmap_base; |
| 58 | unsigned long mmap_size; |
| 59 | spinlock_t lock; |
| 60 | struct fasync_struct *async_queue; |
| 61 | wait_queue_head_t wait; |
| 62 | /* hsi channel ids */ |
| 63 | int channel_id_cmd; |
| 64 | int channel_id_data; |
| 65 | }; |
| 66 | |
| 67 | #define SSI_CHANNEL_STATE_READING 1 |
| 68 | #define SSI_CHANNEL_STATE_WRITING (1 << 1) |
| 69 | #define SSI_CHANNEL_STATE_POLL (1 << 2) |
| 70 | #define SSI_CHANNEL_STATE_ERROR (1 << 3) |
| 71 | |
| 72 | #define TARGET_MASK 0xf000000 |
| 73 | #define TARGET_REMOTE (1 << CS_DOMAIN_SHIFT) |
| 74 | #define TARGET_LOCAL 0 |
| 75 | |
| 76 | /* Number of pre-allocated commands buffers */ |
| 77 | #define CS_MAX_CMDS 4 |
| 78 | |
| 79 | /* |
| 80 | * During data transfers, transactions must be handled |
| 81 | * within 20ms (fixed value in cmtspeech HSI protocol) |
| 82 | */ |
| 83 | #define CS_QOS_LATENCY_FOR_DATA_USEC 20000 |
| 84 | |
| 85 | /* Timeout to wait for pending HSI transfers to complete */ |
| 86 | #define CS_HSI_TRANSFER_TIMEOUT_MS 500 |
| 87 | |
| 88 | |
| 89 | #define RX_PTR_BOUNDARY_SHIFT 8 |
| 90 | #define RX_PTR_MAX_SHIFT (RX_PTR_BOUNDARY_SHIFT + \ |
| 91 | CS_MAX_BUFFERS_SHIFT) |
| 92 | struct cs_hsi_iface { |
| 93 | struct hsi_client *cl; |
| 94 | struct hsi_client *master; |
| 95 | |
| 96 | unsigned int iface_state; |
| 97 | unsigned int wakeline_state; |
| 98 | unsigned int control_state; |
| 99 | unsigned int data_state; |
| 100 | |
| 101 | /* state exposed to application */ |
| 102 | struct cs_mmap_config_block *mmap_cfg; |
| 103 | |
| 104 | unsigned long mmap_base; |
| 105 | unsigned long mmap_size; |
| 106 | |
| 107 | unsigned int rx_slot; |
| 108 | unsigned int tx_slot; |
| 109 | |
| 110 | /* note: for security reasons, we do not trust the contents of |
| 111 | * mmap_cfg, but instead duplicate the variables here */ |
| 112 | unsigned int buf_size; |
| 113 | unsigned int rx_bufs; |
| 114 | unsigned int tx_bufs; |
| 115 | unsigned int rx_ptr_boundary; |
| 116 | unsigned int rx_offsets[CS_MAX_BUFFERS]; |
| 117 | unsigned int tx_offsets[CS_MAX_BUFFERS]; |
| 118 | |
| 119 | /* size of aligned memory blocks */ |
| 120 | unsigned int slot_size; |
| 121 | unsigned int flags; |
| 122 | |
| 123 | struct list_head cmdqueue; |
| 124 | |
| 125 | struct hsi_msg *data_rx_msg; |
| 126 | struct hsi_msg *data_tx_msg; |
| 127 | wait_queue_head_t datawait; |
| 128 | |
| 129 | struct pm_qos_request pm_qos_req; |
| 130 | |
| 131 | spinlock_t lock; |
| 132 | }; |
| 133 | |
| 134 | static struct cs_char cs_char_data; |
| 135 | |
| 136 | static void cs_hsi_read_on_control(struct cs_hsi_iface *hi); |
| 137 | static void cs_hsi_read_on_data(struct cs_hsi_iface *hi); |
| 138 | |
| 139 | static inline void rx_ptr_shift_too_big(void) |
| 140 | { |
| 141 | BUILD_BUG_ON((1LLU << RX_PTR_MAX_SHIFT) > UINT_MAX); |
| 142 | } |
| 143 | |
| 144 | static void cs_notify(u32 message, struct list_head *head) |
| 145 | { |
| 146 | struct char_queue *entry; |
| 147 | |
| 148 | spin_lock(&cs_char_data.lock); |
| 149 | |
| 150 | if (!cs_char_data.opened) { |
| 151 | spin_unlock(&cs_char_data.lock); |
| 152 | goto out; |
| 153 | } |
| 154 | |
| 155 | entry = kmalloc(sizeof(*entry), GFP_ATOMIC); |
| 156 | if (!entry) { |
| 157 | dev_err(&cs_char_data.cl->device, |
| 158 | "Can't allocate new entry for the queue.\n"); |
| 159 | spin_unlock(&cs_char_data.lock); |
| 160 | goto out; |
| 161 | } |
| 162 | |
| 163 | entry->msg = message; |
| 164 | list_add_tail(&entry->list, head); |
| 165 | |
| 166 | spin_unlock(&cs_char_data.lock); |
| 167 | |
| 168 | wake_up_interruptible(&cs_char_data.wait); |
| 169 | kill_fasync(&cs_char_data.async_queue, SIGIO, POLL_IN); |
| 170 | |
| 171 | out: |
| 172 | return; |
| 173 | } |
| 174 | |
| 175 | static u32 cs_pop_entry(struct list_head *head) |
| 176 | { |
| 177 | struct char_queue *entry; |
| 178 | u32 data; |
| 179 | |
| 180 | entry = list_entry(head->next, struct char_queue, list); |
| 181 | data = entry->msg; |
| 182 | list_del(&entry->list); |
| 183 | kfree(entry); |
| 184 | |
| 185 | return data; |
| 186 | } |
| 187 | |
| 188 | static void cs_notify_control(u32 message) |
| 189 | { |
| 190 | cs_notify(message, &cs_char_data.chardev_queue); |
| 191 | } |
| 192 | |
| 193 | static void cs_notify_data(u32 message, int maxlength) |
| 194 | { |
| 195 | cs_notify(message, &cs_char_data.dataind_queue); |
| 196 | |
| 197 | spin_lock(&cs_char_data.lock); |
| 198 | cs_char_data.dataind_pending++; |
| 199 | while (cs_char_data.dataind_pending > maxlength && |
| 200 | !list_empty(&cs_char_data.dataind_queue)) { |
| 201 | dev_dbg(&cs_char_data.cl->device, "data notification " |
| 202 | "queue overrun (%u entries)\n", cs_char_data.dataind_pending); |
| 203 | |
| 204 | cs_pop_entry(&cs_char_data.dataind_queue); |
| 205 | cs_char_data.dataind_pending--; |
| 206 | } |
| 207 | spin_unlock(&cs_char_data.lock); |
| 208 | } |
| 209 | |
| 210 | static inline void cs_set_cmd(struct hsi_msg *msg, u32 cmd) |
| 211 | { |
| 212 | u32 *data = sg_virt(msg->sgt.sgl); |
| 213 | *data = cmd; |
| 214 | } |
| 215 | |
| 216 | static inline u32 cs_get_cmd(struct hsi_msg *msg) |
| 217 | { |
| 218 | u32 *data = sg_virt(msg->sgt.sgl); |
| 219 | return *data; |
| 220 | } |
| 221 | |
| 222 | static void cs_release_cmd(struct hsi_msg *msg) |
| 223 | { |
| 224 | struct cs_hsi_iface *hi = msg->context; |
| 225 | |
| 226 | list_add_tail(&msg->link, &hi->cmdqueue); |
| 227 | } |
| 228 | |
| 229 | static void cs_cmd_destructor(struct hsi_msg *msg) |
| 230 | { |
| 231 | struct cs_hsi_iface *hi = msg->context; |
| 232 | |
| 233 | spin_lock(&hi->lock); |
| 234 | |
| 235 | dev_dbg(&cs_char_data.cl->device, "control cmd destructor\n"); |
| 236 | |
| 237 | if (hi->iface_state != CS_STATE_CLOSED) |
| 238 | dev_err(&hi->cl->device, "Cmd flushed while driver active\n"); |
| 239 | |
| 240 | if (msg->ttype == HSI_MSG_READ) |
| 241 | hi->control_state &= |
| 242 | ~(SSI_CHANNEL_STATE_POLL | SSI_CHANNEL_STATE_READING); |
| 243 | else if (msg->ttype == HSI_MSG_WRITE && |
| 244 | hi->control_state & SSI_CHANNEL_STATE_WRITING) |
| 245 | hi->control_state &= ~SSI_CHANNEL_STATE_WRITING; |
| 246 | |
| 247 | cs_release_cmd(msg); |
| 248 | |
| 249 | spin_unlock(&hi->lock); |
| 250 | } |
| 251 | |
| 252 | static struct hsi_msg *cs_claim_cmd(struct cs_hsi_iface* ssi) |
| 253 | { |
| 254 | struct hsi_msg *msg; |
| 255 | |
| 256 | BUG_ON(list_empty(&ssi->cmdqueue)); |
| 257 | |
| 258 | msg = list_first_entry(&ssi->cmdqueue, struct hsi_msg, link); |
| 259 | list_del(&msg->link); |
| 260 | msg->destructor = cs_cmd_destructor; |
| 261 | |
| 262 | return msg; |
| 263 | } |
| 264 | |
| 265 | static void cs_free_cmds(struct cs_hsi_iface *ssi) |
| 266 | { |
| 267 | struct hsi_msg *msg, *tmp; |
| 268 | |
| 269 | list_for_each_entry_safe(msg, tmp, &ssi->cmdqueue, link) { |
| 270 | list_del(&msg->link); |
| 271 | msg->destructor = NULL; |
| 272 | kfree(sg_virt(msg->sgt.sgl)); |
| 273 | hsi_free_msg(msg); |
| 274 | } |
| 275 | } |
| 276 | |
| 277 | static int cs_alloc_cmds(struct cs_hsi_iface *hi) |
| 278 | { |
| 279 | struct hsi_msg *msg; |
| 280 | u32 *buf; |
| 281 | unsigned int i; |
| 282 | |
| 283 | INIT_LIST_HEAD(&hi->cmdqueue); |
| 284 | |
| 285 | for (i = 0; i < CS_MAX_CMDS; i++) { |
| 286 | msg = hsi_alloc_msg(1, GFP_KERNEL); |
| 287 | if (!msg) |
| 288 | goto out; |
| 289 | buf = kmalloc(sizeof(*buf), GFP_KERNEL); |
| 290 | if (!buf) { |
| 291 | hsi_free_msg(msg); |
| 292 | goto out; |
| 293 | } |
| 294 | sg_init_one(msg->sgt.sgl, buf, sizeof(*buf)); |
| 295 | msg->channel = cs_char_data.channel_id_cmd; |
| 296 | msg->context = hi; |
| 297 | list_add_tail(&msg->link, &hi->cmdqueue); |
| 298 | } |
| 299 | |
| 300 | return 0; |
| 301 | |
| 302 | out: |
| 303 | cs_free_cmds(hi); |
| 304 | return -ENOMEM; |
| 305 | } |
| 306 | |
| 307 | static void cs_hsi_data_destructor(struct hsi_msg *msg) |
| 308 | { |
| 309 | struct cs_hsi_iface *hi = msg->context; |
| 310 | const char *dir = (msg->ttype == HSI_MSG_READ) ? "TX" : "RX"; |
| 311 | |
| 312 | dev_dbg(&cs_char_data.cl->device, "Freeing data %s message\n", dir); |
| 313 | |
| 314 | spin_lock(&hi->lock); |
| 315 | if (hi->iface_state != CS_STATE_CLOSED) |
| 316 | dev_err(&cs_char_data.cl->device, |
| 317 | "Data %s flush while device active\n", dir); |
| 318 | if (msg->ttype == HSI_MSG_READ) |
| 319 | hi->data_state &= |
| 320 | ~(SSI_CHANNEL_STATE_POLL | SSI_CHANNEL_STATE_READING); |
| 321 | else |
| 322 | hi->data_state &= ~SSI_CHANNEL_STATE_WRITING; |
| 323 | |
| 324 | msg->status = HSI_STATUS_COMPLETED; |
| 325 | if (unlikely(waitqueue_active(&hi->datawait))) |
| 326 | wake_up_interruptible(&hi->datawait); |
| 327 | |
| 328 | spin_unlock(&hi->lock); |
| 329 | } |
| 330 | |
| 331 | static int cs_hsi_alloc_data(struct cs_hsi_iface *hi) |
| 332 | { |
| 333 | struct hsi_msg *txmsg, *rxmsg; |
| 334 | int res = 0; |
| 335 | |
| 336 | rxmsg = hsi_alloc_msg(1, GFP_KERNEL); |
| 337 | if (!rxmsg) { |
| 338 | res = -ENOMEM; |
| 339 | goto out1; |
| 340 | } |
| 341 | rxmsg->channel = cs_char_data.channel_id_data; |
| 342 | rxmsg->destructor = cs_hsi_data_destructor; |
| 343 | rxmsg->context = hi; |
| 344 | |
| 345 | txmsg = hsi_alloc_msg(1, GFP_KERNEL); |
| 346 | if (!txmsg) { |
| 347 | res = -ENOMEM; |
| 348 | goto out2; |
| 349 | } |
| 350 | txmsg->channel = cs_char_data.channel_id_data; |
| 351 | txmsg->destructor = cs_hsi_data_destructor; |
| 352 | txmsg->context = hi; |
| 353 | |
| 354 | hi->data_rx_msg = rxmsg; |
| 355 | hi->data_tx_msg = txmsg; |
| 356 | |
| 357 | return 0; |
| 358 | |
| 359 | out2: |
| 360 | hsi_free_msg(rxmsg); |
| 361 | out1: |
| 362 | return res; |
| 363 | } |
| 364 | |
| 365 | static void cs_hsi_free_data_msg(struct hsi_msg *msg) |
| 366 | { |
| 367 | WARN_ON(msg->status != HSI_STATUS_COMPLETED && |
| 368 | msg->status != HSI_STATUS_ERROR); |
| 369 | hsi_free_msg(msg); |
| 370 | } |
| 371 | |
| 372 | static void cs_hsi_free_data(struct cs_hsi_iface *hi) |
| 373 | { |
| 374 | cs_hsi_free_data_msg(hi->data_rx_msg); |
| 375 | cs_hsi_free_data_msg(hi->data_tx_msg); |
| 376 | } |
| 377 | |
| 378 | static inline void __cs_hsi_error_pre(struct cs_hsi_iface *hi, |
| 379 | struct hsi_msg *msg, const char *info, |
| 380 | unsigned int *state) |
| 381 | { |
| 382 | spin_lock(&hi->lock); |
| 383 | dev_err(&hi->cl->device, "HSI %s error, msg %d, state %u\n", |
| 384 | info, msg->status, *state); |
| 385 | } |
| 386 | |
| 387 | static inline void __cs_hsi_error_post(struct cs_hsi_iface *hi) |
| 388 | { |
| 389 | spin_unlock(&hi->lock); |
| 390 | } |
| 391 | |
| 392 | static inline void __cs_hsi_error_read_bits(unsigned int *state) |
| 393 | { |
| 394 | *state |= SSI_CHANNEL_STATE_ERROR; |
| 395 | *state &= ~(SSI_CHANNEL_STATE_READING | SSI_CHANNEL_STATE_POLL); |
| 396 | } |
| 397 | |
| 398 | static inline void __cs_hsi_error_write_bits(unsigned int *state) |
| 399 | { |
| 400 | *state |= SSI_CHANNEL_STATE_ERROR; |
| 401 | *state &= ~SSI_CHANNEL_STATE_WRITING; |
| 402 | } |
| 403 | |
| 404 | static void cs_hsi_control_read_error(struct cs_hsi_iface *hi, |
| 405 | struct hsi_msg *msg) |
| 406 | { |
| 407 | __cs_hsi_error_pre(hi, msg, "control read", &hi->control_state); |
| 408 | cs_release_cmd(msg); |
| 409 | __cs_hsi_error_read_bits(&hi->control_state); |
| 410 | __cs_hsi_error_post(hi); |
| 411 | } |
| 412 | |
| 413 | static void cs_hsi_control_write_error(struct cs_hsi_iface *hi, |
| 414 | struct hsi_msg *msg) |
| 415 | { |
| 416 | __cs_hsi_error_pre(hi, msg, "control write", &hi->control_state); |
| 417 | cs_release_cmd(msg); |
| 418 | __cs_hsi_error_write_bits(&hi->control_state); |
| 419 | __cs_hsi_error_post(hi); |
| 420 | |
| 421 | } |
| 422 | |
| 423 | static void cs_hsi_data_read_error(struct cs_hsi_iface *hi, struct hsi_msg *msg) |
| 424 | { |
| 425 | __cs_hsi_error_pre(hi, msg, "data read", &hi->data_state); |
| 426 | __cs_hsi_error_read_bits(&hi->data_state); |
| 427 | __cs_hsi_error_post(hi); |
| 428 | } |
| 429 | |
| 430 | static void cs_hsi_data_write_error(struct cs_hsi_iface *hi, |
| 431 | struct hsi_msg *msg) |
| 432 | { |
| 433 | __cs_hsi_error_pre(hi, msg, "data write", &hi->data_state); |
| 434 | __cs_hsi_error_write_bits(&hi->data_state); |
| 435 | __cs_hsi_error_post(hi); |
| 436 | } |
| 437 | |
| 438 | static void cs_hsi_read_on_control_complete(struct hsi_msg *msg) |
| 439 | { |
| 440 | u32 cmd = cs_get_cmd(msg); |
| 441 | struct cs_hsi_iface *hi = msg->context; |
| 442 | |
| 443 | spin_lock(&hi->lock); |
| 444 | hi->control_state &= ~SSI_CHANNEL_STATE_READING; |
| 445 | if (msg->status == HSI_STATUS_ERROR) { |
| 446 | dev_err(&hi->cl->device, "Control RX error detected\n"); |
Kai Vehmanen | 7f62fe8 | 2010-06-02 22:23:34 +0300 | [diff] [blame] | 447 | spin_unlock(&hi->lock); |
Iago Abal | 3c13ab1 | 2016-06-03 11:21:25 +0200 | [diff] [blame] | 448 | cs_hsi_control_read_error(hi, msg); |
Kai Vehmanen | 7f62fe8 | 2010-06-02 22:23:34 +0300 | [diff] [blame] | 449 | goto out; |
| 450 | } |
| 451 | dev_dbg(&hi->cl->device, "Read on control: %08X\n", cmd); |
| 452 | cs_release_cmd(msg); |
| 453 | if (hi->flags & CS_FEAT_TSTAMP_RX_CTRL) { |
Sebastian Reichel | 5023a5c | 2015-04-16 19:05:18 +0200 | [diff] [blame] | 454 | struct timespec tspec; |
| 455 | struct cs_timestamp *tstamp = |
Kai Vehmanen | 7f62fe8 | 2010-06-02 22:23:34 +0300 | [diff] [blame] | 456 | &hi->mmap_cfg->tstamp_rx_ctrl; |
Sebastian Reichel | 5023a5c | 2015-04-16 19:05:18 +0200 | [diff] [blame] | 457 | |
| 458 | ktime_get_ts(&tspec); |
| 459 | |
| 460 | tstamp->tv_sec = (__u32) tspec.tv_sec; |
| 461 | tstamp->tv_nsec = (__u32) tspec.tv_nsec; |
Kai Vehmanen | 7f62fe8 | 2010-06-02 22:23:34 +0300 | [diff] [blame] | 462 | } |
| 463 | spin_unlock(&hi->lock); |
| 464 | |
| 465 | cs_notify_control(cmd); |
| 466 | |
| 467 | out: |
| 468 | cs_hsi_read_on_control(hi); |
| 469 | } |
| 470 | |
| 471 | static void cs_hsi_peek_on_control_complete(struct hsi_msg *msg) |
| 472 | { |
| 473 | struct cs_hsi_iface *hi = msg->context; |
| 474 | int ret; |
| 475 | |
| 476 | if (msg->status == HSI_STATUS_ERROR) { |
| 477 | dev_err(&hi->cl->device, "Control peek RX error detected\n"); |
| 478 | cs_hsi_control_read_error(hi, msg); |
| 479 | return; |
| 480 | } |
| 481 | |
| 482 | WARN_ON(!(hi->control_state & SSI_CHANNEL_STATE_READING)); |
| 483 | |
| 484 | dev_dbg(&hi->cl->device, "Peek on control complete, reading\n"); |
| 485 | msg->sgt.nents = 1; |
| 486 | msg->complete = cs_hsi_read_on_control_complete; |
| 487 | ret = hsi_async_read(hi->cl, msg); |
| 488 | if (ret) |
| 489 | cs_hsi_control_read_error(hi, msg); |
| 490 | } |
| 491 | |
| 492 | static void cs_hsi_read_on_control(struct cs_hsi_iface *hi) |
| 493 | { |
| 494 | struct hsi_msg *msg; |
| 495 | int ret; |
| 496 | |
| 497 | spin_lock(&hi->lock); |
| 498 | if (hi->control_state & SSI_CHANNEL_STATE_READING) { |
| 499 | dev_err(&hi->cl->device, "Control read already pending (%d)\n", |
| 500 | hi->control_state); |
| 501 | spin_unlock(&hi->lock); |
| 502 | return; |
| 503 | } |
| 504 | if (hi->control_state & SSI_CHANNEL_STATE_ERROR) { |
| 505 | dev_err(&hi->cl->device, "Control read error (%d)\n", |
| 506 | hi->control_state); |
| 507 | spin_unlock(&hi->lock); |
| 508 | return; |
| 509 | } |
| 510 | hi->control_state |= SSI_CHANNEL_STATE_READING; |
| 511 | dev_dbg(&hi->cl->device, "Issuing RX on control\n"); |
| 512 | msg = cs_claim_cmd(hi); |
| 513 | spin_unlock(&hi->lock); |
| 514 | |
| 515 | msg->sgt.nents = 0; |
| 516 | msg->complete = cs_hsi_peek_on_control_complete; |
| 517 | ret = hsi_async_read(hi->cl, msg); |
| 518 | if (ret) |
| 519 | cs_hsi_control_read_error(hi, msg); |
| 520 | } |
| 521 | |
| 522 | static void cs_hsi_write_on_control_complete(struct hsi_msg *msg) |
| 523 | { |
| 524 | struct cs_hsi_iface *hi = msg->context; |
| 525 | if (msg->status == HSI_STATUS_COMPLETED) { |
| 526 | spin_lock(&hi->lock); |
| 527 | hi->control_state &= ~SSI_CHANNEL_STATE_WRITING; |
| 528 | cs_release_cmd(msg); |
| 529 | spin_unlock(&hi->lock); |
| 530 | } else if (msg->status == HSI_STATUS_ERROR) { |
| 531 | cs_hsi_control_write_error(hi, msg); |
| 532 | } else { |
| 533 | dev_err(&hi->cl->device, |
| 534 | "unexpected status in control write callback %d\n", |
| 535 | msg->status); |
| 536 | } |
| 537 | } |
| 538 | |
| 539 | static int cs_hsi_write_on_control(struct cs_hsi_iface *hi, u32 message) |
| 540 | { |
| 541 | struct hsi_msg *msg; |
| 542 | int ret; |
| 543 | |
| 544 | spin_lock(&hi->lock); |
| 545 | if (hi->control_state & SSI_CHANNEL_STATE_ERROR) { |
| 546 | spin_unlock(&hi->lock); |
| 547 | return -EIO; |
| 548 | } |
| 549 | if (hi->control_state & SSI_CHANNEL_STATE_WRITING) { |
| 550 | dev_err(&hi->cl->device, |
| 551 | "Write still pending on control channel.\n"); |
| 552 | spin_unlock(&hi->lock); |
| 553 | return -EBUSY; |
| 554 | } |
| 555 | hi->control_state |= SSI_CHANNEL_STATE_WRITING; |
| 556 | msg = cs_claim_cmd(hi); |
| 557 | spin_unlock(&hi->lock); |
| 558 | |
| 559 | cs_set_cmd(msg, message); |
| 560 | msg->sgt.nents = 1; |
| 561 | msg->complete = cs_hsi_write_on_control_complete; |
| 562 | dev_dbg(&hi->cl->device, |
| 563 | "Sending control message %08X\n", message); |
| 564 | ret = hsi_async_write(hi->cl, msg); |
| 565 | if (ret) { |
| 566 | dev_err(&hi->cl->device, |
| 567 | "async_write failed with %d\n", ret); |
| 568 | cs_hsi_control_write_error(hi, msg); |
| 569 | } |
| 570 | |
| 571 | /* |
| 572 | * Make sure control read is always pending when issuing |
| 573 | * new control writes. This is needed as the controller |
| 574 | * may flush our messages if e.g. the peer device reboots |
| 575 | * unexpectedly (and we cannot directly resubmit a new read from |
| 576 | * the message destructor; see cs_cmd_destructor()). |
| 577 | */ |
| 578 | if (!(hi->control_state & SSI_CHANNEL_STATE_READING)) { |
| 579 | dev_err(&hi->cl->device, "Restarting control reads\n"); |
| 580 | cs_hsi_read_on_control(hi); |
| 581 | } |
| 582 | |
| 583 | return 0; |
| 584 | } |
| 585 | |
| 586 | static void cs_hsi_read_on_data_complete(struct hsi_msg *msg) |
| 587 | { |
| 588 | struct cs_hsi_iface *hi = msg->context; |
| 589 | u32 payload; |
| 590 | |
| 591 | if (unlikely(msg->status == HSI_STATUS_ERROR)) { |
| 592 | cs_hsi_data_read_error(hi, msg); |
| 593 | return; |
| 594 | } |
| 595 | |
| 596 | spin_lock(&hi->lock); |
| 597 | WARN_ON(!(hi->data_state & SSI_CHANNEL_STATE_READING)); |
| 598 | hi->data_state &= ~SSI_CHANNEL_STATE_READING; |
| 599 | payload = CS_RX_DATA_RECEIVED; |
| 600 | payload |= hi->rx_slot; |
| 601 | hi->rx_slot++; |
| 602 | hi->rx_slot %= hi->rx_ptr_boundary; |
| 603 | /* expose current rx ptr in mmap area */ |
| 604 | hi->mmap_cfg->rx_ptr = hi->rx_slot; |
| 605 | if (unlikely(waitqueue_active(&hi->datawait))) |
| 606 | wake_up_interruptible(&hi->datawait); |
| 607 | spin_unlock(&hi->lock); |
| 608 | |
| 609 | cs_notify_data(payload, hi->rx_bufs); |
| 610 | cs_hsi_read_on_data(hi); |
| 611 | } |
| 612 | |
| 613 | static void cs_hsi_peek_on_data_complete(struct hsi_msg *msg) |
| 614 | { |
| 615 | struct cs_hsi_iface *hi = msg->context; |
| 616 | u32 *address; |
| 617 | int ret; |
| 618 | |
| 619 | if (unlikely(msg->status == HSI_STATUS_ERROR)) { |
| 620 | cs_hsi_data_read_error(hi, msg); |
| 621 | return; |
| 622 | } |
| 623 | if (unlikely(hi->iface_state != CS_STATE_CONFIGURED)) { |
| 624 | dev_err(&hi->cl->device, "Data received in invalid state\n"); |
| 625 | cs_hsi_data_read_error(hi, msg); |
| 626 | return; |
| 627 | } |
| 628 | |
| 629 | spin_lock(&hi->lock); |
| 630 | WARN_ON(!(hi->data_state & SSI_CHANNEL_STATE_POLL)); |
| 631 | hi->data_state &= ~SSI_CHANNEL_STATE_POLL; |
| 632 | hi->data_state |= SSI_CHANNEL_STATE_READING; |
| 633 | spin_unlock(&hi->lock); |
| 634 | |
| 635 | address = (u32 *)(hi->mmap_base + |
| 636 | hi->rx_offsets[hi->rx_slot % hi->rx_bufs]); |
| 637 | sg_init_one(msg->sgt.sgl, address, hi->buf_size); |
| 638 | msg->sgt.nents = 1; |
| 639 | msg->complete = cs_hsi_read_on_data_complete; |
| 640 | ret = hsi_async_read(hi->cl, msg); |
| 641 | if (ret) |
| 642 | cs_hsi_data_read_error(hi, msg); |
| 643 | } |
| 644 | |
| 645 | /* |
| 646 | * Read/write transaction is ongoing. Returns false if in |
| 647 | * SSI_CHANNEL_STATE_POLL state. |
| 648 | */ |
| 649 | static inline int cs_state_xfer_active(unsigned int state) |
| 650 | { |
| 651 | return (state & SSI_CHANNEL_STATE_WRITING) || |
| 652 | (state & SSI_CHANNEL_STATE_READING); |
| 653 | } |
| 654 | |
| 655 | /* |
| 656 | * No pending read/writes |
| 657 | */ |
| 658 | static inline int cs_state_idle(unsigned int state) |
| 659 | { |
| 660 | return !(state & ~SSI_CHANNEL_STATE_ERROR); |
| 661 | } |
| 662 | |
| 663 | static void cs_hsi_read_on_data(struct cs_hsi_iface *hi) |
| 664 | { |
| 665 | struct hsi_msg *rxmsg; |
| 666 | int ret; |
| 667 | |
| 668 | spin_lock(&hi->lock); |
| 669 | if (hi->data_state & |
| 670 | (SSI_CHANNEL_STATE_READING | SSI_CHANNEL_STATE_POLL)) { |
| 671 | dev_dbg(&hi->cl->device, "Data read already pending (%u)\n", |
| 672 | hi->data_state); |
| 673 | spin_unlock(&hi->lock); |
| 674 | return; |
| 675 | } |
| 676 | hi->data_state |= SSI_CHANNEL_STATE_POLL; |
| 677 | spin_unlock(&hi->lock); |
| 678 | |
| 679 | rxmsg = hi->data_rx_msg; |
| 680 | sg_init_one(rxmsg->sgt.sgl, (void *)hi->mmap_base, 0); |
| 681 | rxmsg->sgt.nents = 0; |
| 682 | rxmsg->complete = cs_hsi_peek_on_data_complete; |
| 683 | |
| 684 | ret = hsi_async_read(hi->cl, rxmsg); |
| 685 | if (ret) |
| 686 | cs_hsi_data_read_error(hi, rxmsg); |
| 687 | } |
| 688 | |
| 689 | static void cs_hsi_write_on_data_complete(struct hsi_msg *msg) |
| 690 | { |
| 691 | struct cs_hsi_iface *hi = msg->context; |
| 692 | |
| 693 | if (msg->status == HSI_STATUS_COMPLETED) { |
| 694 | spin_lock(&hi->lock); |
| 695 | hi->data_state &= ~SSI_CHANNEL_STATE_WRITING; |
| 696 | if (unlikely(waitqueue_active(&hi->datawait))) |
| 697 | wake_up_interruptible(&hi->datawait); |
| 698 | spin_unlock(&hi->lock); |
| 699 | } else { |
| 700 | cs_hsi_data_write_error(hi, msg); |
| 701 | } |
| 702 | } |
| 703 | |
| 704 | static int cs_hsi_write_on_data(struct cs_hsi_iface *hi, unsigned int slot) |
| 705 | { |
| 706 | u32 *address; |
| 707 | struct hsi_msg *txmsg; |
| 708 | int ret; |
| 709 | |
| 710 | spin_lock(&hi->lock); |
| 711 | if (hi->iface_state != CS_STATE_CONFIGURED) { |
| 712 | dev_err(&hi->cl->device, "Not configured, aborting\n"); |
| 713 | ret = -EINVAL; |
| 714 | goto error; |
| 715 | } |
| 716 | if (hi->data_state & SSI_CHANNEL_STATE_ERROR) { |
| 717 | dev_err(&hi->cl->device, "HSI error, aborting\n"); |
| 718 | ret = -EIO; |
| 719 | goto error; |
| 720 | } |
| 721 | if (hi->data_state & SSI_CHANNEL_STATE_WRITING) { |
| 722 | dev_err(&hi->cl->device, "Write pending on data channel.\n"); |
| 723 | ret = -EBUSY; |
| 724 | goto error; |
| 725 | } |
| 726 | hi->data_state |= SSI_CHANNEL_STATE_WRITING; |
| 727 | spin_unlock(&hi->lock); |
| 728 | |
| 729 | hi->tx_slot = slot; |
| 730 | address = (u32 *)(hi->mmap_base + hi->tx_offsets[hi->tx_slot]); |
| 731 | txmsg = hi->data_tx_msg; |
| 732 | sg_init_one(txmsg->sgt.sgl, address, hi->buf_size); |
| 733 | txmsg->complete = cs_hsi_write_on_data_complete; |
| 734 | ret = hsi_async_write(hi->cl, txmsg); |
| 735 | if (ret) |
| 736 | cs_hsi_data_write_error(hi, txmsg); |
| 737 | |
| 738 | return ret; |
| 739 | |
| 740 | error: |
| 741 | spin_unlock(&hi->lock); |
| 742 | if (ret == -EIO) |
| 743 | cs_hsi_data_write_error(hi, hi->data_tx_msg); |
| 744 | |
| 745 | return ret; |
| 746 | } |
| 747 | |
| 748 | static unsigned int cs_hsi_get_state(struct cs_hsi_iface *hi) |
| 749 | { |
| 750 | return hi->iface_state; |
| 751 | } |
| 752 | |
| 753 | static int cs_hsi_command(struct cs_hsi_iface *hi, u32 cmd) |
| 754 | { |
| 755 | int ret = 0; |
| 756 | |
| 757 | local_bh_disable(); |
| 758 | switch (cmd & TARGET_MASK) { |
| 759 | case TARGET_REMOTE: |
| 760 | ret = cs_hsi_write_on_control(hi, cmd); |
| 761 | break; |
| 762 | case TARGET_LOCAL: |
| 763 | if ((cmd & CS_CMD_MASK) == CS_TX_DATA_READY) |
| 764 | ret = cs_hsi_write_on_data(hi, cmd & CS_PARAM_MASK); |
| 765 | else |
| 766 | ret = -EINVAL; |
| 767 | break; |
| 768 | default: |
| 769 | ret = -EINVAL; |
| 770 | break; |
| 771 | } |
| 772 | local_bh_enable(); |
| 773 | |
| 774 | return ret; |
| 775 | } |
| 776 | |
| 777 | static void cs_hsi_set_wakeline(struct cs_hsi_iface *hi, bool new_state) |
| 778 | { |
| 779 | int change = 0; |
| 780 | |
| 781 | spin_lock_bh(&hi->lock); |
| 782 | if (hi->wakeline_state != new_state) { |
| 783 | hi->wakeline_state = new_state; |
| 784 | change = 1; |
| 785 | dev_dbg(&hi->cl->device, "setting wake line to %d (%p)\n", |
| 786 | new_state, hi->cl); |
| 787 | } |
| 788 | spin_unlock_bh(&hi->lock); |
| 789 | |
| 790 | if (change) { |
| 791 | if (new_state) |
| 792 | ssip_slave_start_tx(hi->master); |
| 793 | else |
| 794 | ssip_slave_stop_tx(hi->master); |
| 795 | } |
| 796 | |
| 797 | dev_dbg(&hi->cl->device, "wake line set to %d (%p)\n", |
| 798 | new_state, hi->cl); |
| 799 | } |
| 800 | |
| 801 | static void set_buffer_sizes(struct cs_hsi_iface *hi, int rx_bufs, int tx_bufs) |
| 802 | { |
| 803 | hi->rx_bufs = rx_bufs; |
| 804 | hi->tx_bufs = tx_bufs; |
| 805 | hi->mmap_cfg->rx_bufs = rx_bufs; |
| 806 | hi->mmap_cfg->tx_bufs = tx_bufs; |
| 807 | |
| 808 | if (hi->flags & CS_FEAT_ROLLING_RX_COUNTER) { |
| 809 | /* |
| 810 | * For more robust overrun detection, let the rx |
| 811 | * pointer run in range 0..'boundary-1'. Boundary |
| 812 | * is a multiple of rx_bufs, and limited in max size |
| 813 | * by RX_PTR_MAX_SHIFT to allow for fast ptr-diff |
| 814 | * calculation. |
| 815 | */ |
| 816 | hi->rx_ptr_boundary = (rx_bufs << RX_PTR_BOUNDARY_SHIFT); |
| 817 | hi->mmap_cfg->rx_ptr_boundary = hi->rx_ptr_boundary; |
| 818 | } else { |
| 819 | hi->rx_ptr_boundary = hi->rx_bufs; |
| 820 | } |
| 821 | } |
| 822 | |
| 823 | static int check_buf_params(struct cs_hsi_iface *hi, |
| 824 | const struct cs_buffer_config *buf_cfg) |
| 825 | { |
| 826 | size_t buf_size_aligned = L1_CACHE_ALIGN(buf_cfg->buf_size) * |
| 827 | (buf_cfg->rx_bufs + buf_cfg->tx_bufs); |
| 828 | size_t ctrl_size_aligned = L1_CACHE_ALIGN(sizeof(*hi->mmap_cfg)); |
| 829 | int r = 0; |
| 830 | |
| 831 | if (buf_cfg->rx_bufs > CS_MAX_BUFFERS || |
| 832 | buf_cfg->tx_bufs > CS_MAX_BUFFERS) { |
| 833 | r = -EINVAL; |
| 834 | } else if ((buf_size_aligned + ctrl_size_aligned) >= hi->mmap_size) { |
| 835 | dev_err(&hi->cl->device, "No space for the requested buffer " |
| 836 | "configuration\n"); |
| 837 | r = -ENOBUFS; |
| 838 | } |
| 839 | |
| 840 | return r; |
| 841 | } |
| 842 | |
| 843 | /** |
| 844 | * Block until pending data transfers have completed. |
| 845 | */ |
| 846 | static int cs_hsi_data_sync(struct cs_hsi_iface *hi) |
| 847 | { |
| 848 | int r = 0; |
| 849 | |
| 850 | spin_lock_bh(&hi->lock); |
| 851 | |
| 852 | if (!cs_state_xfer_active(hi->data_state)) { |
| 853 | dev_dbg(&hi->cl->device, "hsi_data_sync break, idle\n"); |
| 854 | goto out; |
| 855 | } |
| 856 | |
| 857 | for (;;) { |
| 858 | int s; |
| 859 | DEFINE_WAIT(wait); |
| 860 | if (!cs_state_xfer_active(hi->data_state)) |
| 861 | goto out; |
| 862 | if (signal_pending(current)) { |
| 863 | r = -ERESTARTSYS; |
| 864 | goto out; |
| 865 | } |
| 866 | /** |
| 867 | * prepare_to_wait must be called with hi->lock held |
| 868 | * so that callbacks can check for waitqueue_active() |
| 869 | */ |
| 870 | prepare_to_wait(&hi->datawait, &wait, TASK_INTERRUPTIBLE); |
| 871 | spin_unlock_bh(&hi->lock); |
| 872 | s = schedule_timeout( |
| 873 | msecs_to_jiffies(CS_HSI_TRANSFER_TIMEOUT_MS)); |
| 874 | spin_lock_bh(&hi->lock); |
| 875 | finish_wait(&hi->datawait, &wait); |
| 876 | if (!s) { |
| 877 | dev_dbg(&hi->cl->device, |
| 878 | "hsi_data_sync timeout after %d ms\n", |
| 879 | CS_HSI_TRANSFER_TIMEOUT_MS); |
| 880 | r = -EIO; |
| 881 | goto out; |
| 882 | } |
| 883 | } |
| 884 | |
| 885 | out: |
| 886 | spin_unlock_bh(&hi->lock); |
| 887 | dev_dbg(&hi->cl->device, "hsi_data_sync done with res %d\n", r); |
| 888 | |
| 889 | return r; |
| 890 | } |
| 891 | |
| 892 | static void cs_hsi_data_enable(struct cs_hsi_iface *hi, |
| 893 | struct cs_buffer_config *buf_cfg) |
| 894 | { |
| 895 | unsigned int data_start, i; |
| 896 | |
| 897 | BUG_ON(hi->buf_size == 0); |
| 898 | |
| 899 | set_buffer_sizes(hi, buf_cfg->rx_bufs, buf_cfg->tx_bufs); |
| 900 | |
| 901 | hi->slot_size = L1_CACHE_ALIGN(hi->buf_size); |
| 902 | dev_dbg(&hi->cl->device, |
| 903 | "setting slot size to %u, buf size %u, align %u\n", |
| 904 | hi->slot_size, hi->buf_size, L1_CACHE_BYTES); |
| 905 | |
| 906 | data_start = L1_CACHE_ALIGN(sizeof(*hi->mmap_cfg)); |
| 907 | dev_dbg(&hi->cl->device, |
| 908 | "setting data start at %u, cfg block %u, align %u\n", |
| 909 | data_start, sizeof(*hi->mmap_cfg), L1_CACHE_BYTES); |
| 910 | |
| 911 | for (i = 0; i < hi->mmap_cfg->rx_bufs; i++) { |
| 912 | hi->rx_offsets[i] = data_start + i * hi->slot_size; |
| 913 | hi->mmap_cfg->rx_offsets[i] = hi->rx_offsets[i]; |
| 914 | dev_dbg(&hi->cl->device, "DL buf #%u at %u\n", |
| 915 | i, hi->rx_offsets[i]); |
| 916 | } |
| 917 | for (i = 0; i < hi->mmap_cfg->tx_bufs; i++) { |
| 918 | hi->tx_offsets[i] = data_start + |
| 919 | (i + hi->mmap_cfg->rx_bufs) * hi->slot_size; |
| 920 | hi->mmap_cfg->tx_offsets[i] = hi->tx_offsets[i]; |
| 921 | dev_dbg(&hi->cl->device, "UL buf #%u at %u\n", |
| 922 | i, hi->rx_offsets[i]); |
| 923 | } |
| 924 | |
| 925 | hi->iface_state = CS_STATE_CONFIGURED; |
| 926 | } |
| 927 | |
| 928 | static void cs_hsi_data_disable(struct cs_hsi_iface *hi, int old_state) |
| 929 | { |
| 930 | if (old_state == CS_STATE_CONFIGURED) { |
| 931 | dev_dbg(&hi->cl->device, |
| 932 | "closing data channel with slot size 0\n"); |
| 933 | hi->iface_state = CS_STATE_OPENED; |
| 934 | } |
| 935 | } |
| 936 | |
| 937 | static int cs_hsi_buf_config(struct cs_hsi_iface *hi, |
| 938 | struct cs_buffer_config *buf_cfg) |
| 939 | { |
| 940 | int r = 0; |
| 941 | unsigned int old_state = hi->iface_state; |
| 942 | |
| 943 | spin_lock_bh(&hi->lock); |
| 944 | /* Prevent new transactions during buffer reconfig */ |
| 945 | if (old_state == CS_STATE_CONFIGURED) |
| 946 | hi->iface_state = CS_STATE_OPENED; |
| 947 | spin_unlock_bh(&hi->lock); |
| 948 | |
| 949 | /* |
| 950 | * make sure that no non-zero data reads are ongoing before |
| 951 | * proceeding to change the buffer layout |
| 952 | */ |
| 953 | r = cs_hsi_data_sync(hi); |
| 954 | if (r < 0) |
| 955 | return r; |
| 956 | |
| 957 | WARN_ON(cs_state_xfer_active(hi->data_state)); |
| 958 | |
| 959 | spin_lock_bh(&hi->lock); |
| 960 | r = check_buf_params(hi, buf_cfg); |
| 961 | if (r < 0) |
| 962 | goto error; |
| 963 | |
| 964 | hi->buf_size = buf_cfg->buf_size; |
| 965 | hi->mmap_cfg->buf_size = hi->buf_size; |
| 966 | hi->flags = buf_cfg->flags; |
| 967 | |
| 968 | hi->rx_slot = 0; |
| 969 | hi->tx_slot = 0; |
| 970 | hi->slot_size = 0; |
| 971 | |
| 972 | if (hi->buf_size) |
| 973 | cs_hsi_data_enable(hi, buf_cfg); |
| 974 | else |
| 975 | cs_hsi_data_disable(hi, old_state); |
| 976 | |
| 977 | spin_unlock_bh(&hi->lock); |
| 978 | |
| 979 | if (old_state != hi->iface_state) { |
| 980 | if (hi->iface_state == CS_STATE_CONFIGURED) { |
| 981 | pm_qos_add_request(&hi->pm_qos_req, |
| 982 | PM_QOS_CPU_DMA_LATENCY, |
| 983 | CS_QOS_LATENCY_FOR_DATA_USEC); |
| 984 | local_bh_disable(); |
| 985 | cs_hsi_read_on_data(hi); |
| 986 | local_bh_enable(); |
| 987 | } else if (old_state == CS_STATE_CONFIGURED) { |
| 988 | pm_qos_remove_request(&hi->pm_qos_req); |
| 989 | } |
| 990 | } |
| 991 | return r; |
| 992 | |
| 993 | error: |
| 994 | spin_unlock_bh(&hi->lock); |
| 995 | return r; |
| 996 | } |
| 997 | |
| 998 | static int cs_hsi_start(struct cs_hsi_iface **hi, struct hsi_client *cl, |
| 999 | unsigned long mmap_base, unsigned long mmap_size) |
| 1000 | { |
| 1001 | int err = 0; |
| 1002 | struct cs_hsi_iface *hsi_if = kzalloc(sizeof(*hsi_if), GFP_KERNEL); |
| 1003 | |
| 1004 | dev_dbg(&cl->device, "cs_hsi_start\n"); |
| 1005 | |
| 1006 | if (!hsi_if) { |
| 1007 | err = -ENOMEM; |
| 1008 | goto leave0; |
| 1009 | } |
| 1010 | spin_lock_init(&hsi_if->lock); |
| 1011 | hsi_if->cl = cl; |
| 1012 | hsi_if->iface_state = CS_STATE_CLOSED; |
| 1013 | hsi_if->mmap_cfg = (struct cs_mmap_config_block *)mmap_base; |
| 1014 | hsi_if->mmap_base = mmap_base; |
| 1015 | hsi_if->mmap_size = mmap_size; |
| 1016 | memset(hsi_if->mmap_cfg, 0, sizeof(*hsi_if->mmap_cfg)); |
| 1017 | init_waitqueue_head(&hsi_if->datawait); |
| 1018 | err = cs_alloc_cmds(hsi_if); |
| 1019 | if (err < 0) { |
| 1020 | dev_err(&cl->device, "Unable to alloc HSI messages\n"); |
| 1021 | goto leave1; |
| 1022 | } |
| 1023 | err = cs_hsi_alloc_data(hsi_if); |
| 1024 | if (err < 0) { |
| 1025 | dev_err(&cl->device, "Unable to alloc HSI messages for data\n"); |
| 1026 | goto leave2; |
| 1027 | } |
| 1028 | err = hsi_claim_port(cl, 1); |
| 1029 | if (err < 0) { |
| 1030 | dev_err(&cl->device, |
| 1031 | "Could not open, HSI port already claimed\n"); |
| 1032 | goto leave3; |
| 1033 | } |
| 1034 | hsi_if->master = ssip_slave_get_master(cl); |
| 1035 | if (IS_ERR(hsi_if->master)) { |
Julia Lawall | 265ef3e | 2015-04-05 14:06:26 +0200 | [diff] [blame] | 1036 | err = PTR_ERR(hsi_if->master); |
Kai Vehmanen | 7f62fe8 | 2010-06-02 22:23:34 +0300 | [diff] [blame] | 1037 | dev_err(&cl->device, "Could not get HSI master client\n"); |
| 1038 | goto leave4; |
| 1039 | } |
| 1040 | if (!ssip_slave_running(hsi_if->master)) { |
| 1041 | err = -ENODEV; |
| 1042 | dev_err(&cl->device, |
| 1043 | "HSI port not initialized\n"); |
| 1044 | goto leave4; |
| 1045 | } |
| 1046 | |
| 1047 | hsi_if->iface_state = CS_STATE_OPENED; |
| 1048 | local_bh_disable(); |
| 1049 | cs_hsi_read_on_control(hsi_if); |
| 1050 | local_bh_enable(); |
| 1051 | |
| 1052 | dev_dbg(&cl->device, "cs_hsi_start...done\n"); |
| 1053 | |
| 1054 | BUG_ON(!hi); |
| 1055 | *hi = hsi_if; |
| 1056 | |
| 1057 | return 0; |
| 1058 | |
| 1059 | leave4: |
| 1060 | hsi_release_port(cl); |
| 1061 | leave3: |
| 1062 | cs_hsi_free_data(hsi_if); |
| 1063 | leave2: |
| 1064 | cs_free_cmds(hsi_if); |
| 1065 | leave1: |
| 1066 | kfree(hsi_if); |
| 1067 | leave0: |
| 1068 | dev_dbg(&cl->device, "cs_hsi_start...done/error\n\n"); |
| 1069 | |
| 1070 | return err; |
| 1071 | } |
| 1072 | |
| 1073 | static void cs_hsi_stop(struct cs_hsi_iface *hi) |
| 1074 | { |
| 1075 | dev_dbg(&hi->cl->device, "cs_hsi_stop\n"); |
| 1076 | cs_hsi_set_wakeline(hi, 0); |
| 1077 | ssip_slave_put_master(hi->master); |
| 1078 | |
| 1079 | /* hsi_release_port() needs to be called with CS_STATE_CLOSED */ |
| 1080 | hi->iface_state = CS_STATE_CLOSED; |
| 1081 | hsi_release_port(hi->cl); |
| 1082 | |
| 1083 | /* |
| 1084 | * hsi_release_port() should flush out all the pending |
| 1085 | * messages, so cs_state_idle() should be true for both |
| 1086 | * control and data channels. |
| 1087 | */ |
| 1088 | WARN_ON(!cs_state_idle(hi->control_state)); |
| 1089 | WARN_ON(!cs_state_idle(hi->data_state)); |
| 1090 | |
| 1091 | if (pm_qos_request_active(&hi->pm_qos_req)) |
| 1092 | pm_qos_remove_request(&hi->pm_qos_req); |
| 1093 | |
| 1094 | spin_lock_bh(&hi->lock); |
| 1095 | cs_hsi_free_data(hi); |
| 1096 | cs_free_cmds(hi); |
| 1097 | spin_unlock_bh(&hi->lock); |
| 1098 | kfree(hi); |
| 1099 | } |
| 1100 | |
| 1101 | static int cs_char_vma_fault(struct vm_area_struct *vma, struct vm_fault *vmf) |
| 1102 | { |
| 1103 | struct cs_char *csdata = vma->vm_private_data; |
| 1104 | struct page *page; |
| 1105 | |
| 1106 | page = virt_to_page(csdata->mmap_base); |
| 1107 | get_page(page); |
| 1108 | vmf->page = page; |
| 1109 | |
| 1110 | return 0; |
| 1111 | } |
| 1112 | |
Kirill A. Shutemov | 7cbea8d | 2015-09-09 15:39:26 -0700 | [diff] [blame] | 1113 | static const struct vm_operations_struct cs_char_vm_ops = { |
Kai Vehmanen | 7f62fe8 | 2010-06-02 22:23:34 +0300 | [diff] [blame] | 1114 | .fault = cs_char_vma_fault, |
| 1115 | }; |
| 1116 | |
| 1117 | static int cs_char_fasync(int fd, struct file *file, int on) |
| 1118 | { |
| 1119 | struct cs_char *csdata = file->private_data; |
| 1120 | |
| 1121 | if (fasync_helper(fd, file, on, &csdata->async_queue) < 0) |
| 1122 | return -EIO; |
| 1123 | |
| 1124 | return 0; |
| 1125 | } |
| 1126 | |
| 1127 | static unsigned int cs_char_poll(struct file *file, poll_table *wait) |
| 1128 | { |
| 1129 | struct cs_char *csdata = file->private_data; |
| 1130 | unsigned int ret = 0; |
| 1131 | |
| 1132 | poll_wait(file, &cs_char_data.wait, wait); |
| 1133 | spin_lock_bh(&csdata->lock); |
| 1134 | if (!list_empty(&csdata->chardev_queue)) |
| 1135 | ret = POLLIN | POLLRDNORM; |
| 1136 | else if (!list_empty(&csdata->dataind_queue)) |
| 1137 | ret = POLLIN | POLLRDNORM; |
| 1138 | spin_unlock_bh(&csdata->lock); |
| 1139 | |
| 1140 | return ret; |
| 1141 | } |
| 1142 | |
| 1143 | static ssize_t cs_char_read(struct file *file, char __user *buf, size_t count, |
| 1144 | loff_t *unused) |
| 1145 | { |
| 1146 | struct cs_char *csdata = file->private_data; |
| 1147 | u32 data; |
| 1148 | ssize_t retval; |
| 1149 | |
| 1150 | if (count < sizeof(data)) |
| 1151 | return -EINVAL; |
| 1152 | |
| 1153 | for (;;) { |
| 1154 | DEFINE_WAIT(wait); |
| 1155 | |
| 1156 | spin_lock_bh(&csdata->lock); |
| 1157 | if (!list_empty(&csdata->chardev_queue)) { |
| 1158 | data = cs_pop_entry(&csdata->chardev_queue); |
| 1159 | } else if (!list_empty(&csdata->dataind_queue)) { |
| 1160 | data = cs_pop_entry(&csdata->dataind_queue); |
| 1161 | csdata->dataind_pending--; |
| 1162 | } else { |
| 1163 | data = 0; |
| 1164 | } |
| 1165 | spin_unlock_bh(&csdata->lock); |
| 1166 | |
| 1167 | if (data) |
| 1168 | break; |
| 1169 | if (file->f_flags & O_NONBLOCK) { |
| 1170 | retval = -EAGAIN; |
| 1171 | goto out; |
| 1172 | } else if (signal_pending(current)) { |
| 1173 | retval = -ERESTARTSYS; |
| 1174 | goto out; |
| 1175 | } |
| 1176 | prepare_to_wait_exclusive(&csdata->wait, &wait, |
| 1177 | TASK_INTERRUPTIBLE); |
| 1178 | schedule(); |
| 1179 | finish_wait(&csdata->wait, &wait); |
| 1180 | } |
| 1181 | |
| 1182 | retval = put_user(data, (u32 __user *)buf); |
| 1183 | if (!retval) |
| 1184 | retval = sizeof(data); |
| 1185 | |
| 1186 | out: |
| 1187 | return retval; |
| 1188 | } |
| 1189 | |
| 1190 | static ssize_t cs_char_write(struct file *file, const char __user *buf, |
| 1191 | size_t count, loff_t *unused) |
| 1192 | { |
| 1193 | struct cs_char *csdata = file->private_data; |
| 1194 | u32 data; |
| 1195 | int err; |
| 1196 | ssize_t retval; |
| 1197 | |
| 1198 | if (count < sizeof(data)) |
| 1199 | return -EINVAL; |
| 1200 | |
| 1201 | if (get_user(data, (u32 __user *)buf)) |
| 1202 | retval = -EFAULT; |
| 1203 | else |
| 1204 | retval = count; |
| 1205 | |
| 1206 | err = cs_hsi_command(csdata->hi, data); |
| 1207 | if (err < 0) |
| 1208 | retval = err; |
| 1209 | |
| 1210 | return retval; |
| 1211 | } |
| 1212 | |
| 1213 | static long cs_char_ioctl(struct file *file, unsigned int cmd, |
| 1214 | unsigned long arg) |
| 1215 | { |
| 1216 | struct cs_char *csdata = file->private_data; |
| 1217 | int r = 0; |
| 1218 | |
| 1219 | switch (cmd) { |
| 1220 | case CS_GET_STATE: { |
| 1221 | unsigned int state; |
| 1222 | |
| 1223 | state = cs_hsi_get_state(csdata->hi); |
| 1224 | if (copy_to_user((void __user *)arg, &state, sizeof(state))) |
| 1225 | r = -EFAULT; |
| 1226 | |
| 1227 | break; |
| 1228 | } |
| 1229 | case CS_SET_WAKELINE: { |
| 1230 | unsigned int state; |
| 1231 | |
| 1232 | if (copy_from_user(&state, (void __user *)arg, sizeof(state))) { |
| 1233 | r = -EFAULT; |
| 1234 | break; |
| 1235 | } |
| 1236 | |
| 1237 | if (state > 1) { |
| 1238 | r = -EINVAL; |
| 1239 | break; |
| 1240 | } |
| 1241 | |
| 1242 | cs_hsi_set_wakeline(csdata->hi, !!state); |
| 1243 | |
| 1244 | break; |
| 1245 | } |
| 1246 | case CS_GET_IF_VERSION: { |
| 1247 | unsigned int ifver = CS_IF_VERSION; |
| 1248 | |
| 1249 | if (copy_to_user((void __user *)arg, &ifver, sizeof(ifver))) |
| 1250 | r = -EFAULT; |
| 1251 | |
| 1252 | break; |
| 1253 | } |
| 1254 | case CS_CONFIG_BUFS: { |
| 1255 | struct cs_buffer_config buf_cfg; |
| 1256 | |
| 1257 | if (copy_from_user(&buf_cfg, (void __user *)arg, |
| 1258 | sizeof(buf_cfg))) |
| 1259 | r = -EFAULT; |
| 1260 | else |
| 1261 | r = cs_hsi_buf_config(csdata->hi, &buf_cfg); |
| 1262 | |
| 1263 | break; |
| 1264 | } |
| 1265 | default: |
| 1266 | r = -ENOTTY; |
| 1267 | break; |
| 1268 | } |
| 1269 | |
| 1270 | return r; |
| 1271 | } |
| 1272 | |
| 1273 | static int cs_char_mmap(struct file *file, struct vm_area_struct *vma) |
| 1274 | { |
| 1275 | if (vma->vm_end < vma->vm_start) |
| 1276 | return -EINVAL; |
| 1277 | |
Muhammad Falak R Wani | f6004b7 | 2016-05-21 18:49:21 +0530 | [diff] [blame] | 1278 | if (vma_pages(vma) != 1) |
Kai Vehmanen | 7f62fe8 | 2010-06-02 22:23:34 +0300 | [diff] [blame] | 1279 | return -EINVAL; |
| 1280 | |
| 1281 | vma->vm_flags |= VM_IO | VM_DONTDUMP | VM_DONTEXPAND; |
| 1282 | vma->vm_ops = &cs_char_vm_ops; |
| 1283 | vma->vm_private_data = file->private_data; |
| 1284 | |
| 1285 | return 0; |
| 1286 | } |
| 1287 | |
| 1288 | static int cs_char_open(struct inode *unused, struct file *file) |
| 1289 | { |
| 1290 | int ret = 0; |
| 1291 | unsigned long p; |
| 1292 | |
| 1293 | spin_lock_bh(&cs_char_data.lock); |
| 1294 | if (cs_char_data.opened) { |
| 1295 | ret = -EBUSY; |
| 1296 | spin_unlock_bh(&cs_char_data.lock); |
| 1297 | goto out1; |
| 1298 | } |
| 1299 | cs_char_data.opened = 1; |
| 1300 | cs_char_data.dataind_pending = 0; |
| 1301 | spin_unlock_bh(&cs_char_data.lock); |
| 1302 | |
| 1303 | p = get_zeroed_page(GFP_KERNEL); |
| 1304 | if (!p) { |
| 1305 | ret = -ENOMEM; |
| 1306 | goto out2; |
| 1307 | } |
| 1308 | |
| 1309 | ret = cs_hsi_start(&cs_char_data.hi, cs_char_data.cl, p, CS_MMAP_SIZE); |
| 1310 | if (ret) { |
| 1311 | dev_err(&cs_char_data.cl->device, "Unable to initialize HSI\n"); |
| 1312 | goto out3; |
| 1313 | } |
| 1314 | |
| 1315 | /* these are only used in release so lock not needed */ |
| 1316 | cs_char_data.mmap_base = p; |
| 1317 | cs_char_data.mmap_size = CS_MMAP_SIZE; |
| 1318 | |
| 1319 | file->private_data = &cs_char_data; |
| 1320 | |
| 1321 | return 0; |
| 1322 | |
| 1323 | out3: |
| 1324 | free_page(p); |
| 1325 | out2: |
| 1326 | spin_lock_bh(&cs_char_data.lock); |
| 1327 | cs_char_data.opened = 0; |
| 1328 | spin_unlock_bh(&cs_char_data.lock); |
| 1329 | out1: |
| 1330 | return ret; |
| 1331 | } |
| 1332 | |
| 1333 | static void cs_free_char_queue(struct list_head *head) |
| 1334 | { |
| 1335 | struct char_queue *entry; |
| 1336 | struct list_head *cursor, *next; |
| 1337 | |
| 1338 | if (!list_empty(head)) { |
| 1339 | list_for_each_safe(cursor, next, head) { |
| 1340 | entry = list_entry(cursor, struct char_queue, list); |
| 1341 | list_del(&entry->list); |
| 1342 | kfree(entry); |
| 1343 | } |
| 1344 | } |
| 1345 | |
| 1346 | } |
| 1347 | |
| 1348 | static int cs_char_release(struct inode *unused, struct file *file) |
| 1349 | { |
| 1350 | struct cs_char *csdata = file->private_data; |
| 1351 | |
| 1352 | cs_hsi_stop(csdata->hi); |
| 1353 | spin_lock_bh(&csdata->lock); |
| 1354 | csdata->hi = NULL; |
| 1355 | free_page(csdata->mmap_base); |
| 1356 | cs_free_char_queue(&csdata->chardev_queue); |
| 1357 | cs_free_char_queue(&csdata->dataind_queue); |
| 1358 | csdata->opened = 0; |
| 1359 | spin_unlock_bh(&csdata->lock); |
| 1360 | |
| 1361 | return 0; |
| 1362 | } |
| 1363 | |
| 1364 | static const struct file_operations cs_char_fops = { |
| 1365 | .owner = THIS_MODULE, |
| 1366 | .read = cs_char_read, |
| 1367 | .write = cs_char_write, |
| 1368 | .poll = cs_char_poll, |
| 1369 | .unlocked_ioctl = cs_char_ioctl, |
| 1370 | .mmap = cs_char_mmap, |
| 1371 | .open = cs_char_open, |
| 1372 | .release = cs_char_release, |
| 1373 | .fasync = cs_char_fasync, |
| 1374 | }; |
| 1375 | |
| 1376 | static struct miscdevice cs_char_miscdev = { |
| 1377 | .minor = MISC_DYNAMIC_MINOR, |
| 1378 | .name = "cmt_speech", |
| 1379 | .fops = &cs_char_fops |
| 1380 | }; |
| 1381 | |
| 1382 | static int cs_hsi_client_probe(struct device *dev) |
| 1383 | { |
| 1384 | int err = 0; |
| 1385 | struct hsi_client *cl = to_hsi_client(dev); |
| 1386 | |
| 1387 | dev_dbg(dev, "hsi_client_probe\n"); |
| 1388 | init_waitqueue_head(&cs_char_data.wait); |
| 1389 | spin_lock_init(&cs_char_data.lock); |
| 1390 | cs_char_data.opened = 0; |
| 1391 | cs_char_data.cl = cl; |
| 1392 | cs_char_data.hi = NULL; |
| 1393 | INIT_LIST_HEAD(&cs_char_data.chardev_queue); |
| 1394 | INIT_LIST_HEAD(&cs_char_data.dataind_queue); |
| 1395 | |
| 1396 | cs_char_data.channel_id_cmd = hsi_get_channel_id_by_name(cl, |
| 1397 | "speech-control"); |
| 1398 | if (cs_char_data.channel_id_cmd < 0) { |
| 1399 | err = cs_char_data.channel_id_cmd; |
| 1400 | dev_err(dev, "Could not get cmd channel (%d)\n", err); |
| 1401 | return err; |
| 1402 | } |
| 1403 | |
| 1404 | cs_char_data.channel_id_data = hsi_get_channel_id_by_name(cl, |
| 1405 | "speech-data"); |
| 1406 | if (cs_char_data.channel_id_data < 0) { |
| 1407 | err = cs_char_data.channel_id_data; |
| 1408 | dev_err(dev, "Could not get data channel (%d)\n", err); |
| 1409 | return err; |
| 1410 | } |
| 1411 | |
| 1412 | err = misc_register(&cs_char_miscdev); |
| 1413 | if (err) |
| 1414 | dev_err(dev, "Failed to register: %d\n", err); |
| 1415 | |
| 1416 | return err; |
| 1417 | } |
| 1418 | |
| 1419 | static int cs_hsi_client_remove(struct device *dev) |
| 1420 | { |
| 1421 | struct cs_hsi_iface *hi; |
| 1422 | |
| 1423 | dev_dbg(dev, "hsi_client_remove\n"); |
| 1424 | misc_deregister(&cs_char_miscdev); |
| 1425 | spin_lock_bh(&cs_char_data.lock); |
| 1426 | hi = cs_char_data.hi; |
| 1427 | cs_char_data.hi = NULL; |
| 1428 | spin_unlock_bh(&cs_char_data.lock); |
| 1429 | if (hi) |
| 1430 | cs_hsi_stop(hi); |
| 1431 | |
| 1432 | return 0; |
| 1433 | } |
| 1434 | |
| 1435 | static struct hsi_client_driver cs_hsi_driver = { |
| 1436 | .driver = { |
| 1437 | .name = "cmt-speech", |
| 1438 | .owner = THIS_MODULE, |
| 1439 | .probe = cs_hsi_client_probe, |
| 1440 | .remove = cs_hsi_client_remove, |
| 1441 | }, |
| 1442 | }; |
| 1443 | |
| 1444 | static int __init cs_char_init(void) |
| 1445 | { |
| 1446 | pr_info("CMT speech driver added\n"); |
| 1447 | return hsi_register_client_driver(&cs_hsi_driver); |
| 1448 | } |
| 1449 | module_init(cs_char_init); |
| 1450 | |
| 1451 | static void __exit cs_char_exit(void) |
| 1452 | { |
| 1453 | hsi_unregister_client_driver(&cs_hsi_driver); |
| 1454 | pr_info("CMT speech driver removed\n"); |
| 1455 | } |
| 1456 | module_exit(cs_char_exit); |
| 1457 | |
| 1458 | MODULE_ALIAS("hsi:cmt-speech"); |
| 1459 | MODULE_AUTHOR("Kai Vehmanen <kai.vehmanen@nokia.com>"); |
| 1460 | MODULE_AUTHOR("Peter Ujfalusi <peter.ujfalusi@nokia.com>"); |
| 1461 | MODULE_DESCRIPTION("CMT speech driver"); |
| 1462 | MODULE_LICENSE("GPL v2"); |