Hiroshi DOYU | 340a614 | 2006-12-07 15:43:59 -0800 | [diff] [blame] | 1 | /* |
| 2 | * OMAP mailbox driver |
| 3 | * |
Hiroshi DOYU | f48cca8 | 2009-03-23 18:07:24 -0700 | [diff] [blame] | 4 | * Copyright (C) 2006-2009 Nokia Corporation. All rights reserved. |
Hiroshi DOYU | 340a614 | 2006-12-07 15:43:59 -0800 | [diff] [blame] | 5 | * |
Hiroshi DOYU | f48cca8 | 2009-03-23 18:07:24 -0700 | [diff] [blame] | 6 | * Contact: Hiroshi DOYU <Hiroshi.DOYU@nokia.com> |
Hiroshi DOYU | 340a614 | 2006-12-07 15:43:59 -0800 | [diff] [blame] | 7 | * |
| 8 | * This program is free software; you can redistribute it and/or |
| 9 | * modify it under the terms of the GNU General Public License |
| 10 | * version 2 as published by the Free Software Foundation. |
| 11 | * |
| 12 | * This program is distributed in the hope that it will be useful, but |
| 13 | * WITHOUT ANY WARRANTY; without even the implied warranty of |
| 14 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
| 15 | * General Public License for more details. |
| 16 | * |
| 17 | * You should have received a copy of the GNU General Public License |
| 18 | * along with this program; if not, write to the Free Software |
| 19 | * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA |
| 20 | * 02110-1301 USA |
| 21 | * |
| 22 | */ |
| 23 | |
| 24 | #include <linux/init.h> |
| 25 | #include <linux/module.h> |
| 26 | #include <linux/sched.h> |
| 27 | #include <linux/interrupt.h> |
| 28 | #include <linux/device.h> |
| 29 | #include <linux/blkdev.h> |
| 30 | #include <linux/err.h> |
| 31 | #include <linux/delay.h> |
Russell King | fced80c | 2008-09-06 12:10:45 +0100 | [diff] [blame] | 32 | #include <linux/io.h> |
Russell King | a09e64f | 2008-08-05 16:14:15 +0100 | [diff] [blame] | 33 | #include <mach/mailbox.h> |
Hiroshi DOYU | 340a614 | 2006-12-07 15:43:59 -0800 | [diff] [blame] | 34 | |
| 35 | static struct omap_mbox *mboxes; |
| 36 | static DEFINE_RWLOCK(mboxes_lock); |
| 37 | |
Hiroshi DOYU | 9ae0ee0 | 2009-03-23 18:07:26 -0700 | [diff] [blame^] | 38 | /* |
| 39 | * Mailbox sequence bit API |
| 40 | */ |
| 41 | #if defined(CONFIG_ARCH_OMAP1) |
| 42 | # define MBOX_USE_SEQ_BIT |
| 43 | #elif defined(CONFIG_ARCH_OMAP2) |
| 44 | # define MBOX_USE_SEQ_BIT |
| 45 | #endif |
| 46 | |
| 47 | #ifdef MBOX_USE_SEQ_BIT |
| 48 | /* seq_rcv should be initialized with any value other than |
| 49 | * 0 and 1 << 31, to allow either value for the first |
| 50 | * message. */ |
| 51 | static inline void mbox_seq_init(struct omap_mbox *mbox) |
| 52 | { |
| 53 | /* any value other than 0 and 1 << 31 */ |
| 54 | mbox->seq_rcv = 0xffffffff; |
| 55 | } |
| 56 | |
| 57 | static inline void mbox_seq_toggle(struct omap_mbox *mbox, mbox_msg_t * msg) |
| 58 | { |
| 59 | /* add seq_snd to msg */ |
| 60 | *msg = (*msg & 0x7fffffff) | mbox->seq_snd; |
| 61 | /* flip seq_snd */ |
| 62 | mbox->seq_snd ^= 1 << 31; |
| 63 | } |
| 64 | |
| 65 | static inline int mbox_seq_test(struct omap_mbox *mbox, mbox_msg_t msg) |
| 66 | { |
| 67 | mbox_msg_t seq = msg & (1 << 31); |
| 68 | if (seq == mbox->seq_rcv) |
| 69 | return -1; |
| 70 | mbox->seq_rcv = seq; |
| 71 | return 0; |
| 72 | } |
| 73 | #else |
| 74 | static inline void mbox_seq_init(struct omap_mbox *mbox) |
| 75 | { |
| 76 | } |
| 77 | static inline void mbox_seq_toggle(struct omap_mbox *mbox, mbox_msg_t * msg) |
| 78 | { |
| 79 | } |
| 80 | static inline int mbox_seq_test(struct omap_mbox *mbox, mbox_msg_t msg) |
| 81 | { |
| 82 | return 0; |
| 83 | } |
| 84 | #endif |
| 85 | |
| 86 | /* Mailbox FIFO handle functions */ |
| 87 | static inline mbox_msg_t mbox_fifo_read(struct omap_mbox *mbox) |
| 88 | { |
| 89 | return mbox->ops->fifo_read(mbox); |
| 90 | } |
| 91 | static inline void mbox_fifo_write(struct omap_mbox *mbox, mbox_msg_t msg) |
| 92 | { |
| 93 | mbox->ops->fifo_write(mbox, msg); |
| 94 | } |
| 95 | static inline int mbox_fifo_empty(struct omap_mbox *mbox) |
| 96 | { |
| 97 | return mbox->ops->fifo_empty(mbox); |
| 98 | } |
| 99 | static inline int mbox_fifo_full(struct omap_mbox *mbox) |
| 100 | { |
| 101 | return mbox->ops->fifo_full(mbox); |
| 102 | } |
| 103 | |
| 104 | /* Mailbox IRQ handle functions */ |
| 105 | static inline void enable_mbox_irq(struct omap_mbox *mbox, omap_mbox_irq_t irq) |
| 106 | { |
| 107 | mbox->ops->enable_irq(mbox, irq); |
| 108 | } |
| 109 | static inline void disable_mbox_irq(struct omap_mbox *mbox, omap_mbox_irq_t irq) |
| 110 | { |
| 111 | mbox->ops->disable_irq(mbox, irq); |
| 112 | } |
| 113 | static inline void ack_mbox_irq(struct omap_mbox *mbox, omap_mbox_irq_t irq) |
| 114 | { |
| 115 | if (mbox->ops->ack_irq) |
| 116 | mbox->ops->ack_irq(mbox, irq); |
| 117 | } |
| 118 | static inline int is_mbox_irq(struct omap_mbox *mbox, omap_mbox_irq_t irq) |
| 119 | { |
| 120 | return mbox->ops->is_irq(mbox, irq); |
| 121 | } |
| 122 | |
Hiroshi DOYU | 340a614 | 2006-12-07 15:43:59 -0800 | [diff] [blame] | 123 | /* Mailbox Sequence Bit function */ |
| 124 | void omap_mbox_init_seq(struct omap_mbox *mbox) |
| 125 | { |
| 126 | mbox_seq_init(mbox); |
| 127 | } |
| 128 | EXPORT_SYMBOL(omap_mbox_init_seq); |
| 129 | |
| 130 | /* |
| 131 | * message sender |
| 132 | */ |
| 133 | static int __mbox_msg_send(struct omap_mbox *mbox, mbox_msg_t msg, void *arg) |
| 134 | { |
| 135 | int ret = 0, i = 1000; |
| 136 | |
| 137 | while (mbox_fifo_full(mbox)) { |
| 138 | if (mbox->ops->type == OMAP_MBOX_TYPE2) |
| 139 | return -1; |
| 140 | if (--i == 0) |
| 141 | return -1; |
| 142 | udelay(1); |
| 143 | } |
| 144 | |
| 145 | if (arg && mbox->txq->callback) { |
| 146 | ret = mbox->txq->callback(arg); |
| 147 | if (ret) |
| 148 | goto out; |
| 149 | } |
| 150 | |
| 151 | mbox_seq_toggle(mbox, &msg); |
| 152 | mbox_fifo_write(mbox, msg); |
| 153 | out: |
| 154 | return ret; |
| 155 | } |
| 156 | |
| 157 | int omap_mbox_msg_send(struct omap_mbox *mbox, mbox_msg_t msg, void* arg) |
| 158 | { |
| 159 | struct request *rq; |
| 160 | struct request_queue *q = mbox->txq->queue; |
| 161 | int ret = 0; |
| 162 | |
| 163 | rq = blk_get_request(q, WRITE, GFP_ATOMIC); |
| 164 | if (unlikely(!rq)) { |
| 165 | ret = -ENOMEM; |
| 166 | goto fail; |
| 167 | } |
| 168 | |
| 169 | rq->data = (void *)msg; |
| 170 | blk_insert_request(q, rq, 0, arg); |
| 171 | |
| 172 | schedule_work(&mbox->txq->work); |
| 173 | fail: |
| 174 | return ret; |
| 175 | } |
| 176 | EXPORT_SYMBOL(omap_mbox_msg_send); |
| 177 | |
| 178 | static void mbox_tx_work(struct work_struct *work) |
| 179 | { |
| 180 | int ret; |
| 181 | struct request *rq; |
| 182 | struct omap_mbox_queue *mq = container_of(work, |
| 183 | struct omap_mbox_queue, work); |
| 184 | struct omap_mbox *mbox = mq->queue->queuedata; |
| 185 | struct request_queue *q = mbox->txq->queue; |
| 186 | |
| 187 | while (1) { |
| 188 | spin_lock(q->queue_lock); |
| 189 | rq = elv_next_request(q); |
| 190 | spin_unlock(q->queue_lock); |
| 191 | |
| 192 | if (!rq) |
| 193 | break; |
| 194 | |
| 195 | ret = __mbox_msg_send(mbox, (mbox_msg_t) rq->data, rq->special); |
| 196 | if (ret) { |
| 197 | enable_mbox_irq(mbox, IRQ_TX); |
| 198 | return; |
| 199 | } |
| 200 | |
| 201 | spin_lock(q->queue_lock); |
Kiyoshi Ueda | 650e9cf | 2007-12-11 17:42:27 -0500 | [diff] [blame] | 202 | if (__blk_end_request(rq, 0, 0)) |
| 203 | BUG(); |
Hiroshi DOYU | 340a614 | 2006-12-07 15:43:59 -0800 | [diff] [blame] | 204 | spin_unlock(q->queue_lock); |
| 205 | } |
| 206 | } |
| 207 | |
| 208 | /* |
| 209 | * Message receiver(workqueue) |
| 210 | */ |
| 211 | static void mbox_rx_work(struct work_struct *work) |
| 212 | { |
| 213 | struct omap_mbox_queue *mq = |
| 214 | container_of(work, struct omap_mbox_queue, work); |
| 215 | struct omap_mbox *mbox = mq->queue->queuedata; |
| 216 | struct request_queue *q = mbox->rxq->queue; |
| 217 | struct request *rq; |
| 218 | mbox_msg_t msg; |
| 219 | unsigned long flags; |
| 220 | |
| 221 | if (mbox->rxq->callback == NULL) { |
Hiroshi DOYU | f48cca8 | 2009-03-23 18:07:24 -0700 | [diff] [blame] | 222 | sysfs_notify(&mbox->dev->kobj, NULL, "mbox"); |
Hiroshi DOYU | 340a614 | 2006-12-07 15:43:59 -0800 | [diff] [blame] | 223 | return; |
| 224 | } |
| 225 | |
| 226 | while (1) { |
| 227 | spin_lock_irqsave(q->queue_lock, flags); |
| 228 | rq = elv_next_request(q); |
| 229 | spin_unlock_irqrestore(q->queue_lock, flags); |
| 230 | if (!rq) |
| 231 | break; |
| 232 | |
| 233 | msg = (mbox_msg_t) rq->data; |
| 234 | |
Kiyoshi Ueda | 650e9cf | 2007-12-11 17:42:27 -0500 | [diff] [blame] | 235 | if (blk_end_request(rq, 0, 0)) |
| 236 | BUG(); |
Hiroshi DOYU | 340a614 | 2006-12-07 15:43:59 -0800 | [diff] [blame] | 237 | |
| 238 | mbox->rxq->callback((void *)msg); |
| 239 | } |
| 240 | } |
| 241 | |
| 242 | /* |
| 243 | * Mailbox interrupt handler |
| 244 | */ |
Jens Axboe | 165125e | 2007-07-24 09:28:11 +0200 | [diff] [blame] | 245 | static void mbox_txq_fn(struct request_queue * q) |
Hiroshi DOYU | 340a614 | 2006-12-07 15:43:59 -0800 | [diff] [blame] | 246 | { |
| 247 | } |
| 248 | |
Jens Axboe | 165125e | 2007-07-24 09:28:11 +0200 | [diff] [blame] | 249 | static void mbox_rxq_fn(struct request_queue * q) |
Hiroshi DOYU | 340a614 | 2006-12-07 15:43:59 -0800 | [diff] [blame] | 250 | { |
| 251 | } |
| 252 | |
| 253 | static void __mbox_tx_interrupt(struct omap_mbox *mbox) |
| 254 | { |
| 255 | disable_mbox_irq(mbox, IRQ_TX); |
| 256 | ack_mbox_irq(mbox, IRQ_TX); |
| 257 | schedule_work(&mbox->txq->work); |
| 258 | } |
| 259 | |
| 260 | static void __mbox_rx_interrupt(struct omap_mbox *mbox) |
| 261 | { |
| 262 | struct request *rq; |
| 263 | mbox_msg_t msg; |
Jens Axboe | 165125e | 2007-07-24 09:28:11 +0200 | [diff] [blame] | 264 | struct request_queue *q = mbox->rxq->queue; |
Hiroshi DOYU | 340a614 | 2006-12-07 15:43:59 -0800 | [diff] [blame] | 265 | |
| 266 | disable_mbox_irq(mbox, IRQ_RX); |
| 267 | |
| 268 | while (!mbox_fifo_empty(mbox)) { |
| 269 | rq = blk_get_request(q, WRITE, GFP_ATOMIC); |
| 270 | if (unlikely(!rq)) |
| 271 | goto nomem; |
| 272 | |
| 273 | msg = mbox_fifo_read(mbox); |
| 274 | rq->data = (void *)msg; |
| 275 | |
| 276 | if (unlikely(mbox_seq_test(mbox, msg))) { |
| 277 | pr_info("mbox: Illegal seq bit!(%08x)\n", msg); |
| 278 | if (mbox->err_notify) |
| 279 | mbox->err_notify(); |
| 280 | } |
| 281 | |
| 282 | blk_insert_request(q, rq, 0, NULL); |
| 283 | if (mbox->ops->type == OMAP_MBOX_TYPE1) |
| 284 | break; |
| 285 | } |
| 286 | |
| 287 | /* no more messages in the fifo. clear IRQ source. */ |
| 288 | ack_mbox_irq(mbox, IRQ_RX); |
| 289 | enable_mbox_irq(mbox, IRQ_RX); |
Hiroshi DOYU | f48cca8 | 2009-03-23 18:07:24 -0700 | [diff] [blame] | 290 | nomem: |
Hiroshi DOYU | 340a614 | 2006-12-07 15:43:59 -0800 | [diff] [blame] | 291 | schedule_work(&mbox->rxq->work); |
| 292 | } |
| 293 | |
| 294 | static irqreturn_t mbox_interrupt(int irq, void *p) |
| 295 | { |
Jeff Garzik | 2a7057e | 2007-10-26 05:40:22 -0400 | [diff] [blame] | 296 | struct omap_mbox *mbox = p; |
Hiroshi DOYU | 340a614 | 2006-12-07 15:43:59 -0800 | [diff] [blame] | 297 | |
| 298 | if (is_mbox_irq(mbox, IRQ_TX)) |
| 299 | __mbox_tx_interrupt(mbox); |
| 300 | |
| 301 | if (is_mbox_irq(mbox, IRQ_RX)) |
| 302 | __mbox_rx_interrupt(mbox); |
| 303 | |
| 304 | return IRQ_HANDLED; |
| 305 | } |
| 306 | |
| 307 | /* |
| 308 | * sysfs files |
| 309 | */ |
| 310 | static ssize_t |
| 311 | omap_mbox_write(struct device *dev, struct device_attribute *attr, |
| 312 | const char * buf, size_t count) |
| 313 | { |
| 314 | int ret; |
| 315 | mbox_msg_t *p = (mbox_msg_t *)buf; |
| 316 | struct omap_mbox *mbox = dev_get_drvdata(dev); |
| 317 | |
| 318 | for (; count >= sizeof(mbox_msg_t); count -= sizeof(mbox_msg_t)) { |
| 319 | ret = omap_mbox_msg_send(mbox, be32_to_cpu(*p), NULL); |
| 320 | if (ret) |
| 321 | return -EAGAIN; |
| 322 | p++; |
| 323 | } |
| 324 | |
| 325 | return (size_t)((char *)p - buf); |
| 326 | } |
| 327 | |
| 328 | static ssize_t |
| 329 | omap_mbox_read(struct device *dev, struct device_attribute *attr, char *buf) |
| 330 | { |
| 331 | unsigned long flags; |
| 332 | struct request *rq; |
| 333 | mbox_msg_t *p = (mbox_msg_t *) buf; |
| 334 | struct omap_mbox *mbox = dev_get_drvdata(dev); |
| 335 | struct request_queue *q = mbox->rxq->queue; |
| 336 | |
| 337 | while (1) { |
| 338 | spin_lock_irqsave(q->queue_lock, flags); |
| 339 | rq = elv_next_request(q); |
| 340 | spin_unlock_irqrestore(q->queue_lock, flags); |
| 341 | |
| 342 | if (!rq) |
| 343 | break; |
| 344 | |
| 345 | *p = (mbox_msg_t) rq->data; |
| 346 | |
Kiyoshi Ueda | 650e9cf | 2007-12-11 17:42:27 -0500 | [diff] [blame] | 347 | if (blk_end_request(rq, 0, 0)) |
| 348 | BUG(); |
Hiroshi DOYU | 340a614 | 2006-12-07 15:43:59 -0800 | [diff] [blame] | 349 | |
| 350 | if (unlikely(mbox_seq_test(mbox, *p))) { |
| 351 | pr_info("mbox: Illegal seq bit!(%08x) ignored\n", *p); |
| 352 | continue; |
| 353 | } |
| 354 | p++; |
| 355 | } |
| 356 | |
| 357 | pr_debug("%02x %02x %02x %02x\n", buf[0], buf[1], buf[2], buf[3]); |
| 358 | |
| 359 | return (size_t) ((char *)p - buf); |
| 360 | } |
| 361 | |
| 362 | static DEVICE_ATTR(mbox, S_IRUGO | S_IWUSR, omap_mbox_read, omap_mbox_write); |
| 363 | |
| 364 | static ssize_t mbox_show(struct class *class, char *buf) |
| 365 | { |
| 366 | return sprintf(buf, "mbox"); |
| 367 | } |
| 368 | |
| 369 | static CLASS_ATTR(mbox, S_IRUGO, mbox_show, NULL); |
| 370 | |
| 371 | static struct class omap_mbox_class = { |
Hiroshi DOYU | f48cca8 | 2009-03-23 18:07:24 -0700 | [diff] [blame] | 372 | .name = "omap-mailbox", |
Hiroshi DOYU | 340a614 | 2006-12-07 15:43:59 -0800 | [diff] [blame] | 373 | }; |
| 374 | |
| 375 | static struct omap_mbox_queue *mbox_queue_alloc(struct omap_mbox *mbox, |
| 376 | request_fn_proc * proc, |
| 377 | void (*work) (struct work_struct *)) |
| 378 | { |
Jens Axboe | 165125e | 2007-07-24 09:28:11 +0200 | [diff] [blame] | 379 | struct request_queue *q; |
Hiroshi DOYU | 340a614 | 2006-12-07 15:43:59 -0800 | [diff] [blame] | 380 | struct omap_mbox_queue *mq; |
| 381 | |
| 382 | mq = kzalloc(sizeof(struct omap_mbox_queue), GFP_KERNEL); |
| 383 | if (!mq) |
| 384 | return NULL; |
| 385 | |
| 386 | spin_lock_init(&mq->lock); |
| 387 | |
| 388 | q = blk_init_queue(proc, &mq->lock); |
| 389 | if (!q) |
| 390 | goto error; |
| 391 | q->queuedata = mbox; |
| 392 | mq->queue = q; |
| 393 | |
| 394 | INIT_WORK(&mq->work, work); |
| 395 | |
| 396 | return mq; |
| 397 | error: |
| 398 | kfree(mq); |
| 399 | return NULL; |
| 400 | } |
| 401 | |
| 402 | static void mbox_queue_free(struct omap_mbox_queue *q) |
| 403 | { |
| 404 | blk_cleanup_queue(q->queue); |
| 405 | kfree(q); |
| 406 | } |
| 407 | |
| 408 | static int omap_mbox_init(struct omap_mbox *mbox) |
| 409 | { |
| 410 | int ret; |
| 411 | struct omap_mbox_queue *mq; |
| 412 | |
| 413 | if (likely(mbox->ops->startup)) { |
| 414 | ret = mbox->ops->startup(mbox); |
| 415 | if (unlikely(ret)) |
| 416 | return ret; |
| 417 | } |
| 418 | |
Hiroshi DOYU | 340a614 | 2006-12-07 15:43:59 -0800 | [diff] [blame] | 419 | ret = request_irq(mbox->irq, mbox_interrupt, IRQF_DISABLED, |
| 420 | mbox->name, mbox); |
| 421 | if (unlikely(ret)) { |
| 422 | printk(KERN_ERR |
| 423 | "failed to register mailbox interrupt:%d\n", ret); |
| 424 | goto fail_request_irq; |
| 425 | } |
Hiroshi DOYU | 340a614 | 2006-12-07 15:43:59 -0800 | [diff] [blame] | 426 | |
| 427 | mq = mbox_queue_alloc(mbox, mbox_txq_fn, mbox_tx_work); |
| 428 | if (!mq) { |
| 429 | ret = -ENOMEM; |
| 430 | goto fail_alloc_txq; |
| 431 | } |
| 432 | mbox->txq = mq; |
| 433 | |
| 434 | mq = mbox_queue_alloc(mbox, mbox_rxq_fn, mbox_rx_work); |
| 435 | if (!mq) { |
| 436 | ret = -ENOMEM; |
| 437 | goto fail_alloc_rxq; |
| 438 | } |
| 439 | mbox->rxq = mq; |
| 440 | |
| 441 | return 0; |
| 442 | |
| 443 | fail_alloc_rxq: |
| 444 | mbox_queue_free(mbox->txq); |
| 445 | fail_alloc_txq: |
| 446 | free_irq(mbox->irq, mbox); |
| 447 | fail_request_irq: |
Hiroshi DOYU | 340a614 | 2006-12-07 15:43:59 -0800 | [diff] [blame] | 448 | if (unlikely(mbox->ops->shutdown)) |
| 449 | mbox->ops->shutdown(mbox); |
| 450 | |
| 451 | return ret; |
| 452 | } |
| 453 | |
| 454 | static void omap_mbox_fini(struct omap_mbox *mbox) |
| 455 | { |
| 456 | mbox_queue_free(mbox->txq); |
| 457 | mbox_queue_free(mbox->rxq); |
| 458 | |
| 459 | free_irq(mbox->irq, mbox); |
Hiroshi DOYU | 340a614 | 2006-12-07 15:43:59 -0800 | [diff] [blame] | 460 | |
| 461 | if (unlikely(mbox->ops->shutdown)) |
| 462 | mbox->ops->shutdown(mbox); |
| 463 | } |
| 464 | |
| 465 | static struct omap_mbox **find_mboxes(const char *name) |
| 466 | { |
| 467 | struct omap_mbox **p; |
| 468 | |
| 469 | for (p = &mboxes; *p; p = &(*p)->next) { |
| 470 | if (strcmp((*p)->name, name) == 0) |
| 471 | break; |
| 472 | } |
| 473 | |
| 474 | return p; |
| 475 | } |
| 476 | |
| 477 | struct omap_mbox *omap_mbox_get(const char *name) |
| 478 | { |
| 479 | struct omap_mbox *mbox; |
| 480 | int ret; |
| 481 | |
| 482 | read_lock(&mboxes_lock); |
| 483 | mbox = *(find_mboxes(name)); |
| 484 | if (mbox == NULL) { |
| 485 | read_unlock(&mboxes_lock); |
| 486 | return ERR_PTR(-ENOENT); |
| 487 | } |
| 488 | |
| 489 | read_unlock(&mboxes_lock); |
| 490 | |
| 491 | ret = omap_mbox_init(mbox); |
| 492 | if (ret) |
| 493 | return ERR_PTR(-ENODEV); |
| 494 | |
| 495 | return mbox; |
| 496 | } |
| 497 | EXPORT_SYMBOL(omap_mbox_get); |
| 498 | |
| 499 | void omap_mbox_put(struct omap_mbox *mbox) |
| 500 | { |
| 501 | omap_mbox_fini(mbox); |
| 502 | } |
| 503 | EXPORT_SYMBOL(omap_mbox_put); |
| 504 | |
Hiroshi DOYU | f48cca8 | 2009-03-23 18:07:24 -0700 | [diff] [blame] | 505 | int omap_mbox_register(struct device *parent, struct omap_mbox *mbox) |
Hiroshi DOYU | 340a614 | 2006-12-07 15:43:59 -0800 | [diff] [blame] | 506 | { |
| 507 | int ret = 0; |
| 508 | struct omap_mbox **tmp; |
| 509 | |
| 510 | if (!mbox) |
| 511 | return -EINVAL; |
| 512 | if (mbox->next) |
| 513 | return -EBUSY; |
| 514 | |
Hiroshi DOYU | f48cca8 | 2009-03-23 18:07:24 -0700 | [diff] [blame] | 515 | mbox->dev = device_create(&omap_mbox_class, |
| 516 | parent, 0, mbox, "%s", mbox->name); |
| 517 | if (IS_ERR(mbox->dev)) |
| 518 | return PTR_ERR(mbox->dev); |
| 519 | |
| 520 | ret = device_create_file(mbox->dev, &dev_attr_mbox); |
| 521 | if (ret) |
| 522 | goto err_sysfs; |
| 523 | |
Hiroshi DOYU | 340a614 | 2006-12-07 15:43:59 -0800 | [diff] [blame] | 524 | write_lock(&mboxes_lock); |
| 525 | tmp = find_mboxes(mbox->name); |
Hiroshi DOYU | f48cca8 | 2009-03-23 18:07:24 -0700 | [diff] [blame] | 526 | if (*tmp) { |
Hiroshi DOYU | 340a614 | 2006-12-07 15:43:59 -0800 | [diff] [blame] | 527 | ret = -EBUSY; |
Hiroshi DOYU | f48cca8 | 2009-03-23 18:07:24 -0700 | [diff] [blame] | 528 | write_unlock(&mboxes_lock); |
| 529 | goto err_find; |
| 530 | } |
| 531 | *tmp = mbox; |
Hiroshi DOYU | 340a614 | 2006-12-07 15:43:59 -0800 | [diff] [blame] | 532 | write_unlock(&mboxes_lock); |
| 533 | |
Hiroshi DOYU | f48cca8 | 2009-03-23 18:07:24 -0700 | [diff] [blame] | 534 | return 0; |
| 535 | |
| 536 | err_find: |
| 537 | device_remove_file(mbox->dev, &dev_attr_mbox); |
| 538 | err_sysfs: |
| 539 | device_unregister(mbox->dev); |
Hiroshi DOYU | 340a614 | 2006-12-07 15:43:59 -0800 | [diff] [blame] | 540 | return ret; |
| 541 | } |
| 542 | EXPORT_SYMBOL(omap_mbox_register); |
| 543 | |
| 544 | int omap_mbox_unregister(struct omap_mbox *mbox) |
| 545 | { |
| 546 | struct omap_mbox **tmp; |
| 547 | |
| 548 | write_lock(&mboxes_lock); |
| 549 | tmp = &mboxes; |
| 550 | while (*tmp) { |
| 551 | if (mbox == *tmp) { |
| 552 | *tmp = mbox->next; |
| 553 | mbox->next = NULL; |
| 554 | write_unlock(&mboxes_lock); |
Hiroshi DOYU | f48cca8 | 2009-03-23 18:07:24 -0700 | [diff] [blame] | 555 | device_remove_file(mbox->dev, &dev_attr_mbox); |
| 556 | device_unregister(mbox->dev); |
Hiroshi DOYU | 340a614 | 2006-12-07 15:43:59 -0800 | [diff] [blame] | 557 | return 0; |
| 558 | } |
| 559 | tmp = &(*tmp)->next; |
| 560 | } |
| 561 | write_unlock(&mboxes_lock); |
| 562 | |
| 563 | return -EINVAL; |
| 564 | } |
| 565 | EXPORT_SYMBOL(omap_mbox_unregister); |
| 566 | |
| 567 | static int __init omap_mbox_class_init(void) |
| 568 | { |
| 569 | int ret = class_register(&omap_mbox_class); |
| 570 | if (!ret) |
| 571 | ret = class_create_file(&omap_mbox_class, &class_attr_mbox); |
| 572 | |
| 573 | return ret; |
| 574 | } |
| 575 | |
| 576 | static void __exit omap_mbox_class_exit(void) |
| 577 | { |
| 578 | class_remove_file(&omap_mbox_class, &class_attr_mbox); |
| 579 | class_unregister(&omap_mbox_class); |
| 580 | } |
| 581 | |
| 582 | subsys_initcall(omap_mbox_class_init); |
| 583 | module_exit(omap_mbox_class_exit); |
| 584 | |
Hiroshi DOYU | f48cca8 | 2009-03-23 18:07:24 -0700 | [diff] [blame] | 585 | MODULE_LICENSE("GPL v2"); |
| 586 | MODULE_DESCRIPTION("omap mailbox: interrupt driven messaging"); |
| 587 | MODULE_AUTHOR("Toshihiro Kobayashi and Hiroshi DOYU"); |