Linus Walleij | 38cdfe0 | 2010-09-27 22:11:57 +0100 | [diff] [blame] | 1 | /* |
| 2 | * Copyright (C) ST-Ericsson SA 2010 |
| 3 | * Author: Stefan Nilsson <stefan.xk.nilsson@stericsson.com> for ST-Ericsson. |
| 4 | * Author: Martin Persson <martin.persson@stericsson.com> for ST-Ericsson. |
| 5 | * License terms: GNU General Public License (GPL), version 2. |
| 6 | */ |
| 7 | |
| 8 | /* |
| 9 | * Mailbox nomenclature: |
| 10 | * |
| 11 | * APE MODEM |
| 12 | * mbox pairX |
| 13 | * .......................... |
| 14 | * . . |
| 15 | * . peer . |
| 16 | * . send ---- . |
| 17 | * . --> | | . |
| 18 | * . | | . |
| 19 | * . ---- . |
| 20 | * . . |
| 21 | * . local . |
| 22 | * . rec ---- . |
| 23 | * . | | <-- . |
| 24 | * . | | . |
| 25 | * . ---- . |
| 26 | * ......................... |
| 27 | */ |
| 28 | |
| 29 | #include <linux/init.h> |
| 30 | #include <linux/module.h> |
| 31 | #include <linux/device.h> |
| 32 | #include <linux/interrupt.h> |
| 33 | #include <linux/spinlock.h> |
| 34 | #include <linux/errno.h> |
| 35 | #include <linux/io.h> |
| 36 | #include <linux/irq.h> |
| 37 | #include <linux/platform_device.h> |
| 38 | #include <linux/debugfs.h> |
| 39 | #include <linux/seq_file.h> |
| 40 | #include <linux/completion.h> |
Linus Walleij | 11c8ea8 | 2010-12-17 21:16:23 +0100 | [diff] [blame] | 41 | #include <mach/mbox-db5500.h> |
Linus Walleij | 38cdfe0 | 2010-09-27 22:11:57 +0100 | [diff] [blame] | 42 | |
| 43 | #define MBOX_NAME "mbox" |
| 44 | |
| 45 | #define MBOX_FIFO_DATA 0x000 |
| 46 | #define MBOX_FIFO_ADD 0x004 |
| 47 | #define MBOX_FIFO_REMOVE 0x008 |
| 48 | #define MBOX_FIFO_THRES_FREE 0x00C |
| 49 | #define MBOX_FIFO_THRES_OCCUP 0x010 |
| 50 | #define MBOX_FIFO_STATUS 0x014 |
| 51 | |
| 52 | #define MBOX_DISABLE_IRQ 0x4 |
| 53 | #define MBOX_ENABLE_IRQ 0x0 |
| 54 | #define MBOX_LATCH 1 |
| 55 | |
| 56 | /* Global list of all mailboxes */ |
| 57 | static struct list_head mboxs = LIST_HEAD_INIT(mboxs); |
| 58 | |
| 59 | static struct mbox *get_mbox_with_id(u8 id) |
| 60 | { |
| 61 | u8 i; |
| 62 | struct list_head *pos = &mboxs; |
| 63 | for (i = 0; i <= id; i++) |
| 64 | pos = pos->next; |
| 65 | |
| 66 | return (struct mbox *) list_entry(pos, struct mbox, list); |
| 67 | } |
| 68 | |
| 69 | int mbox_send(struct mbox *mbox, u32 mbox_msg, bool block) |
| 70 | { |
| 71 | int res = 0; |
| 72 | |
| 73 | spin_lock(&mbox->lock); |
| 74 | |
| 75 | dev_dbg(&(mbox->pdev->dev), |
| 76 | "About to buffer 0x%X to mailbox 0x%X." |
| 77 | " ri = %d, wi = %d\n", |
| 78 | mbox_msg, (u32)mbox, mbox->read_index, |
| 79 | mbox->write_index); |
| 80 | |
| 81 | /* Check if write buffer is full */ |
| 82 | while (((mbox->write_index + 1) % MBOX_BUF_SIZE) == mbox->read_index) { |
| 83 | if (!block) { |
| 84 | dev_dbg(&(mbox->pdev->dev), |
| 85 | "Buffer full in non-blocking call! " |
| 86 | "Returning -ENOMEM!\n"); |
| 87 | res = -ENOMEM; |
| 88 | goto exit; |
| 89 | } |
| 90 | spin_unlock(&mbox->lock); |
| 91 | dev_dbg(&(mbox->pdev->dev), |
| 92 | "Buffer full in blocking call! Sleeping...\n"); |
| 93 | mbox->client_blocked = 1; |
| 94 | wait_for_completion(&mbox->buffer_available); |
| 95 | dev_dbg(&(mbox->pdev->dev), |
| 96 | "Blocking send was woken up! Trying again...\n"); |
| 97 | spin_lock(&mbox->lock); |
| 98 | } |
| 99 | |
| 100 | mbox->buffer[mbox->write_index] = mbox_msg; |
| 101 | mbox->write_index = (mbox->write_index + 1) % MBOX_BUF_SIZE; |
| 102 | |
| 103 | /* |
| 104 | * Indicate that we want an IRQ as soon as there is a slot |
| 105 | * in the FIFO |
| 106 | */ |
| 107 | writel(MBOX_ENABLE_IRQ, mbox->virtbase_peer + MBOX_FIFO_THRES_FREE); |
| 108 | |
| 109 | exit: |
| 110 | spin_unlock(&mbox->lock); |
| 111 | return res; |
| 112 | } |
| 113 | EXPORT_SYMBOL(mbox_send); |
| 114 | |
| 115 | #if defined(CONFIG_DEBUG_FS) |
| 116 | /* |
| 117 | * Expected input: <value> <nbr sends> |
| 118 | * Example: "echo 0xdeadbeef 4 > mbox-node" sends 0xdeadbeef 4 times |
| 119 | */ |
| 120 | static ssize_t mbox_write_fifo(struct device *dev, |
| 121 | struct device_attribute *attr, |
| 122 | const char *buf, |
| 123 | size_t count) |
| 124 | { |
| 125 | unsigned long mbox_mess; |
| 126 | unsigned long nbr_sends; |
| 127 | unsigned long i; |
| 128 | char int_buf[16]; |
| 129 | char *token; |
| 130 | char *val; |
| 131 | |
| 132 | struct mbox *mbox = (struct mbox *) dev->platform_data; |
| 133 | |
| 134 | strncpy((char *) &int_buf, buf, sizeof(int_buf)); |
| 135 | token = (char *) &int_buf; |
| 136 | |
| 137 | /* Parse message */ |
| 138 | val = strsep(&token, " "); |
| 139 | if ((val == NULL) || (strict_strtoul(val, 16, &mbox_mess) != 0)) |
| 140 | mbox_mess = 0xDEADBEEF; |
| 141 | |
| 142 | val = strsep(&token, " "); |
| 143 | if ((val == NULL) || (strict_strtoul(val, 10, &nbr_sends) != 0)) |
| 144 | nbr_sends = 1; |
| 145 | |
| 146 | dev_dbg(dev, "Will write 0x%lX %ld times using data struct at 0x%X\n", |
| 147 | mbox_mess, nbr_sends, (u32) mbox); |
| 148 | |
| 149 | for (i = 0; i < nbr_sends; i++) |
| 150 | mbox_send(mbox, mbox_mess, true); |
| 151 | |
| 152 | return count; |
| 153 | } |
| 154 | |
| 155 | static ssize_t mbox_read_fifo(struct device *dev, |
| 156 | struct device_attribute *attr, |
| 157 | char *buf) |
| 158 | { |
| 159 | int mbox_value; |
| 160 | struct mbox *mbox = (struct mbox *) dev->platform_data; |
| 161 | |
| 162 | if ((readl(mbox->virtbase_local + MBOX_FIFO_STATUS) & 0x7) <= 0) |
| 163 | return sprintf(buf, "Mailbox is empty\n"); |
| 164 | |
| 165 | mbox_value = readl(mbox->virtbase_local + MBOX_FIFO_DATA); |
| 166 | writel(MBOX_LATCH, (mbox->virtbase_local + MBOX_FIFO_REMOVE)); |
| 167 | |
| 168 | return sprintf(buf, "0x%X\n", mbox_value); |
| 169 | } |
| 170 | |
Vasiliy Kulikov | db7b122 | 2012-04-25 16:01:51 -0700 | [diff] [blame] | 171 | static DEVICE_ATTR(fifo, S_IWUSR | S_IRUGO, mbox_read_fifo, mbox_write_fifo); |
Linus Walleij | 38cdfe0 | 2010-09-27 22:11:57 +0100 | [diff] [blame] | 172 | |
| 173 | static int mbox_show(struct seq_file *s, void *data) |
| 174 | { |
| 175 | struct list_head *pos; |
| 176 | u8 mbox_index = 0; |
| 177 | |
| 178 | list_for_each(pos, &mboxs) { |
| 179 | struct mbox *m = |
| 180 | (struct mbox *) list_entry(pos, struct mbox, list); |
| 181 | if (m == NULL) { |
| 182 | seq_printf(s, |
| 183 | "Unable to retrieve mailbox %d\n", |
| 184 | mbox_index); |
| 185 | continue; |
| 186 | } |
| 187 | |
| 188 | spin_lock(&m->lock); |
| 189 | if ((m->virtbase_peer == NULL) || (m->virtbase_local == NULL)) { |
| 190 | seq_printf(s, "MAILBOX %d not setup or corrupt\n", |
| 191 | mbox_index); |
| 192 | spin_unlock(&m->lock); |
| 193 | continue; |
| 194 | } |
| 195 | |
| 196 | seq_printf(s, |
| 197 | "===========================\n" |
| 198 | " MAILBOX %d\n" |
| 199 | " PEER MAILBOX DUMP\n" |
| 200 | "---------------------------\n" |
| 201 | "FIFO: 0x%X (%d)\n" |
| 202 | "Free Threshold: 0x%.2X (%d)\n" |
| 203 | "Occupied Threshold: 0x%.2X (%d)\n" |
| 204 | "Status: 0x%.2X (%d)\n" |
| 205 | " Free spaces (ot): %d (%d)\n" |
| 206 | " Occup spaces (ot): %d (%d)\n" |
| 207 | "===========================\n" |
| 208 | " LOCAL MAILBOX DUMP\n" |
| 209 | "---------------------------\n" |
| 210 | "FIFO: 0x%.X (%d)\n" |
| 211 | "Free Threshold: 0x%.2X (%d)\n" |
| 212 | "Occupied Threshold: 0x%.2X (%d)\n" |
| 213 | "Status: 0x%.2X (%d)\n" |
| 214 | " Free spaces (ot): %d (%d)\n" |
| 215 | " Occup spaces (ot): %d (%d)\n" |
| 216 | "===========================\n" |
| 217 | "write_index: %d\n" |
| 218 | "read_index : %d\n" |
| 219 | "===========================\n" |
| 220 | "\n", |
| 221 | mbox_index, |
| 222 | readl(m->virtbase_peer + MBOX_FIFO_DATA), |
| 223 | readl(m->virtbase_peer + MBOX_FIFO_DATA), |
| 224 | readl(m->virtbase_peer + MBOX_FIFO_THRES_FREE), |
| 225 | readl(m->virtbase_peer + MBOX_FIFO_THRES_FREE), |
| 226 | readl(m->virtbase_peer + MBOX_FIFO_THRES_OCCUP), |
| 227 | readl(m->virtbase_peer + MBOX_FIFO_THRES_OCCUP), |
| 228 | readl(m->virtbase_peer + MBOX_FIFO_STATUS), |
| 229 | readl(m->virtbase_peer + MBOX_FIFO_STATUS), |
| 230 | (readl(m->virtbase_peer + MBOX_FIFO_STATUS) >> 4) & 0x7, |
| 231 | (readl(m->virtbase_peer + MBOX_FIFO_STATUS) >> 7) & 0x1, |
| 232 | (readl(m->virtbase_peer + MBOX_FIFO_STATUS) >> 0) & 0x7, |
| 233 | (readl(m->virtbase_peer + MBOX_FIFO_STATUS) >> 3) & 0x1, |
| 234 | readl(m->virtbase_local + MBOX_FIFO_DATA), |
| 235 | readl(m->virtbase_local + MBOX_FIFO_DATA), |
| 236 | readl(m->virtbase_local + MBOX_FIFO_THRES_FREE), |
| 237 | readl(m->virtbase_local + MBOX_FIFO_THRES_FREE), |
| 238 | readl(m->virtbase_local + MBOX_FIFO_THRES_OCCUP), |
| 239 | readl(m->virtbase_local + MBOX_FIFO_THRES_OCCUP), |
| 240 | readl(m->virtbase_local + MBOX_FIFO_STATUS), |
| 241 | readl(m->virtbase_local + MBOX_FIFO_STATUS), |
| 242 | (readl(m->virtbase_local + MBOX_FIFO_STATUS) >> 4) & 0x7, |
| 243 | (readl(m->virtbase_local + MBOX_FIFO_STATUS) >> 7) & 0x1, |
| 244 | (readl(m->virtbase_local + MBOX_FIFO_STATUS) >> 0) & 0x7, |
| 245 | (readl(m->virtbase_local + MBOX_FIFO_STATUS) >> 3) & 0x1, |
| 246 | m->write_index, m->read_index); |
| 247 | mbox_index++; |
| 248 | spin_unlock(&m->lock); |
| 249 | } |
| 250 | |
| 251 | return 0; |
| 252 | } |
| 253 | |
| 254 | static int mbox_open(struct inode *inode, struct file *file) |
| 255 | { |
| 256 | return single_open(file, mbox_show, NULL); |
| 257 | } |
| 258 | |
| 259 | static const struct file_operations mbox_operations = { |
| 260 | .owner = THIS_MODULE, |
| 261 | .open = mbox_open, |
| 262 | .read = seq_read, |
| 263 | .llseek = seq_lseek, |
| 264 | .release = single_release, |
| 265 | }; |
| 266 | #endif |
| 267 | |
| 268 | static irqreturn_t mbox_irq(int irq, void *arg) |
| 269 | { |
| 270 | u32 mbox_value; |
| 271 | int nbr_occup; |
| 272 | int nbr_free; |
| 273 | struct mbox *mbox = (struct mbox *) arg; |
| 274 | |
| 275 | spin_lock(&mbox->lock); |
| 276 | |
| 277 | dev_dbg(&(mbox->pdev->dev), |
| 278 | "mbox IRQ [%d] received. ri = %d, wi = %d\n", |
| 279 | irq, mbox->read_index, mbox->write_index); |
| 280 | |
| 281 | /* |
| 282 | * Check if we have any outgoing messages, and if there is space for |
| 283 | * them in the FIFO. |
| 284 | */ |
| 285 | if (mbox->read_index != mbox->write_index) { |
| 286 | /* |
| 287 | * Check by reading FREE for LOCAL since that indicates |
| 288 | * OCCUP for PEER |
| 289 | */ |
| 290 | nbr_free = (readl(mbox->virtbase_local + MBOX_FIFO_STATUS) |
| 291 | >> 4) & 0x7; |
| 292 | dev_dbg(&(mbox->pdev->dev), |
| 293 | "Status indicates %d empty spaces in the FIFO!\n", |
| 294 | nbr_free); |
| 295 | |
| 296 | while ((nbr_free > 0) && |
| 297 | (mbox->read_index != mbox->write_index)) { |
| 298 | /* Write the message and latch it into the FIFO */ |
| 299 | writel(mbox->buffer[mbox->read_index], |
| 300 | (mbox->virtbase_peer + MBOX_FIFO_DATA)); |
| 301 | writel(MBOX_LATCH, |
| 302 | (mbox->virtbase_peer + MBOX_FIFO_ADD)); |
| 303 | dev_dbg(&(mbox->pdev->dev), |
| 304 | "Wrote message 0x%X to addr 0x%X\n", |
| 305 | mbox->buffer[mbox->read_index], |
| 306 | (u32) (mbox->virtbase_peer + MBOX_FIFO_DATA)); |
| 307 | |
| 308 | nbr_free--; |
| 309 | mbox->read_index = |
| 310 | (mbox->read_index + 1) % MBOX_BUF_SIZE; |
| 311 | } |
| 312 | |
| 313 | /* |
| 314 | * Check if we still want IRQ:s when there is free |
| 315 | * space to send |
| 316 | */ |
| 317 | if (mbox->read_index != mbox->write_index) { |
| 318 | dev_dbg(&(mbox->pdev->dev), |
| 319 | "Still have messages to send, but FIFO full. " |
| 320 | "Request IRQ again!\n"); |
| 321 | writel(MBOX_ENABLE_IRQ, |
| 322 | mbox->virtbase_peer + MBOX_FIFO_THRES_FREE); |
| 323 | } else { |
| 324 | dev_dbg(&(mbox->pdev->dev), |
| 325 | "No more messages to send. " |
| 326 | "Do not request IRQ again!\n"); |
| 327 | writel(MBOX_DISABLE_IRQ, |
| 328 | mbox->virtbase_peer + MBOX_FIFO_THRES_FREE); |
| 329 | } |
| 330 | |
| 331 | /* |
| 332 | * Check if we can signal any blocked clients that it is OK to |
| 333 | * start buffering again |
| 334 | */ |
| 335 | if (mbox->client_blocked && |
| 336 | (((mbox->write_index + 1) % MBOX_BUF_SIZE) |
| 337 | != mbox->read_index)) { |
| 338 | dev_dbg(&(mbox->pdev->dev), |
| 339 | "Waking up blocked client\n"); |
| 340 | complete(&mbox->buffer_available); |
| 341 | mbox->client_blocked = 0; |
| 342 | } |
| 343 | } |
| 344 | |
| 345 | /* Check if we have any incoming messages */ |
| 346 | nbr_occup = readl(mbox->virtbase_local + MBOX_FIFO_STATUS) & 0x7; |
| 347 | if (nbr_occup == 0) |
| 348 | goto exit; |
| 349 | |
| 350 | if (mbox->cb == NULL) { |
| 351 | dev_dbg(&(mbox->pdev->dev), "No receive callback registered, " |
| 352 | "leaving %d incoming messages in fifo!\n", nbr_occup); |
| 353 | goto exit; |
| 354 | } |
| 355 | |
| 356 | /* Read and acknowledge the message */ |
| 357 | mbox_value = readl(mbox->virtbase_local + MBOX_FIFO_DATA); |
| 358 | writel(MBOX_LATCH, (mbox->virtbase_local + MBOX_FIFO_REMOVE)); |
| 359 | |
| 360 | /* Notify consumer of new mailbox message */ |
| 361 | dev_dbg(&(mbox->pdev->dev), "Calling callback for message 0x%X!\n", |
| 362 | mbox_value); |
| 363 | mbox->cb(mbox_value, mbox->client_data); |
| 364 | |
| 365 | exit: |
| 366 | dev_dbg(&(mbox->pdev->dev), "Exit mbox IRQ. ri = %d, wi = %d\n", |
| 367 | mbox->read_index, mbox->write_index); |
| 368 | spin_unlock(&mbox->lock); |
| 369 | |
| 370 | return IRQ_HANDLED; |
| 371 | } |
| 372 | |
| 373 | /* Setup is executed once for each mbox pair */ |
| 374 | struct mbox *mbox_setup(u8 mbox_id, mbox_recv_cb_t *mbox_cb, void *priv) |
| 375 | { |
| 376 | struct resource *resource; |
| 377 | int irq; |
| 378 | int res; |
| 379 | struct mbox *mbox; |
| 380 | |
| 381 | mbox = get_mbox_with_id(mbox_id); |
| 382 | if (mbox == NULL) { |
| 383 | dev_err(&(mbox->pdev->dev), "Incorrect mailbox id: %d!\n", |
| 384 | mbox_id); |
| 385 | goto exit; |
| 386 | } |
| 387 | |
| 388 | /* |
| 389 | * Check if mailbox has been allocated to someone else, |
| 390 | * otherwise allocate it |
| 391 | */ |
| 392 | if (mbox->allocated) { |
| 393 | dev_err(&(mbox->pdev->dev), "Mailbox number %d is busy!\n", |
| 394 | mbox_id); |
| 395 | mbox = NULL; |
| 396 | goto exit; |
| 397 | } |
| 398 | mbox->allocated = true; |
| 399 | |
| 400 | dev_dbg(&(mbox->pdev->dev), "Initiating mailbox number %d: 0x%X...\n", |
| 401 | mbox_id, (u32)mbox); |
| 402 | |
| 403 | mbox->client_data = priv; |
| 404 | mbox->cb = mbox_cb; |
| 405 | |
| 406 | /* Get addr for peer mailbox and ioremap it */ |
| 407 | resource = platform_get_resource_byname(mbox->pdev, |
| 408 | IORESOURCE_MEM, |
| 409 | "mbox_peer"); |
| 410 | if (resource == NULL) { |
| 411 | dev_err(&(mbox->pdev->dev), |
| 412 | "Unable to retrieve mbox peer resource\n"); |
| 413 | mbox = NULL; |
| 414 | goto exit; |
| 415 | } |
| 416 | dev_dbg(&(mbox->pdev->dev), |
| 417 | "Resource name: %s start: 0x%X, end: 0x%X\n", |
| 418 | resource->name, resource->start, resource->end); |
Joe Perches | 06794ea | 2011-03-23 12:55:36 -0700 | [diff] [blame] | 419 | mbox->virtbase_peer = ioremap(resource->start, resource_size(resource)); |
Linus Walleij | 38cdfe0 | 2010-09-27 22:11:57 +0100 | [diff] [blame] | 420 | if (!mbox->virtbase_peer) { |
| 421 | dev_err(&(mbox->pdev->dev), "Unable to ioremap peer mbox\n"); |
| 422 | mbox = NULL; |
| 423 | goto exit; |
| 424 | } |
| 425 | dev_dbg(&(mbox->pdev->dev), |
| 426 | "ioremapped peer physical: (0x%X-0x%X) to virtual: 0x%X\n", |
| 427 | resource->start, resource->end, (u32) mbox->virtbase_peer); |
| 428 | |
| 429 | /* Get addr for local mailbox and ioremap it */ |
| 430 | resource = platform_get_resource_byname(mbox->pdev, |
| 431 | IORESOURCE_MEM, |
| 432 | "mbox_local"); |
| 433 | if (resource == NULL) { |
| 434 | dev_err(&(mbox->pdev->dev), |
| 435 | "Unable to retrieve mbox local resource\n"); |
| 436 | mbox = NULL; |
| 437 | goto exit; |
| 438 | } |
| 439 | dev_dbg(&(mbox->pdev->dev), |
| 440 | "Resource name: %s start: 0x%X, end: 0x%X\n", |
| 441 | resource->name, resource->start, resource->end); |
Joe Perches | 06794ea | 2011-03-23 12:55:36 -0700 | [diff] [blame] | 442 | mbox->virtbase_local = ioremap(resource->start, resource_size(resource)); |
Linus Walleij | 38cdfe0 | 2010-09-27 22:11:57 +0100 | [diff] [blame] | 443 | if (!mbox->virtbase_local) { |
| 444 | dev_err(&(mbox->pdev->dev), "Unable to ioremap local mbox\n"); |
| 445 | mbox = NULL; |
| 446 | goto exit; |
| 447 | } |
| 448 | dev_dbg(&(mbox->pdev->dev), |
| 449 | "ioremapped local physical: (0x%X-0x%X) to virtual: 0x%X\n", |
| 450 | resource->start, resource->end, (u32) mbox->virtbase_peer); |
| 451 | |
| 452 | init_completion(&mbox->buffer_available); |
| 453 | mbox->client_blocked = 0; |
| 454 | |
| 455 | /* Get IRQ for mailbox and allocate it */ |
| 456 | irq = platform_get_irq_byname(mbox->pdev, "mbox_irq"); |
| 457 | if (irq < 0) { |
| 458 | dev_err(&(mbox->pdev->dev), |
| 459 | "Unable to retrieve mbox irq resource\n"); |
| 460 | mbox = NULL; |
| 461 | goto exit; |
| 462 | } |
| 463 | |
| 464 | dev_dbg(&(mbox->pdev->dev), "Allocating irq %d...\n", irq); |
| 465 | res = request_irq(irq, mbox_irq, 0, mbox->name, (void *) mbox); |
| 466 | if (res < 0) { |
| 467 | dev_err(&(mbox->pdev->dev), |
| 468 | "Unable to allocate mbox irq %d\n", irq); |
| 469 | mbox = NULL; |
| 470 | goto exit; |
| 471 | } |
| 472 | |
| 473 | /* Set up mailbox to not launch IRQ on free space in mailbox */ |
| 474 | writel(MBOX_DISABLE_IRQ, mbox->virtbase_peer + MBOX_FIFO_THRES_FREE); |
| 475 | |
| 476 | /* |
| 477 | * Set up mailbox to launch IRQ on new message if we have |
| 478 | * a callback set. If not, do not raise IRQ, but keep message |
| 479 | * in FIFO for manual retrieval |
| 480 | */ |
| 481 | if (mbox_cb != NULL) |
| 482 | writel(MBOX_ENABLE_IRQ, |
| 483 | mbox->virtbase_local + MBOX_FIFO_THRES_OCCUP); |
| 484 | else |
| 485 | writel(MBOX_DISABLE_IRQ, |
| 486 | mbox->virtbase_local + MBOX_FIFO_THRES_OCCUP); |
| 487 | |
| 488 | #if defined(CONFIG_DEBUG_FS) |
| 489 | res = device_create_file(&(mbox->pdev->dev), &dev_attr_fifo); |
| 490 | if (res != 0) |
| 491 | dev_warn(&(mbox->pdev->dev), |
| 492 | "Unable to create mbox sysfs entry"); |
| 493 | |
| 494 | (void) debugfs_create_file("mbox", S_IFREG | S_IRUGO, NULL, |
| 495 | NULL, &mbox_operations); |
| 496 | #endif |
| 497 | |
| 498 | dev_info(&(mbox->pdev->dev), |
Justin P. Mattock | 74ab003 | 2011-01-28 11:47:20 -0800 | [diff] [blame] | 499 | "Mailbox driver with index %d initiated!\n", mbox_id); |
Linus Walleij | 38cdfe0 | 2010-09-27 22:11:57 +0100 | [diff] [blame] | 500 | |
| 501 | exit: |
| 502 | return mbox; |
| 503 | } |
| 504 | EXPORT_SYMBOL(mbox_setup); |
| 505 | |
| 506 | |
| 507 | int __init mbox_probe(struct platform_device *pdev) |
| 508 | { |
| 509 | struct mbox local_mbox; |
| 510 | struct mbox *mbox; |
| 511 | int res = 0; |
| 512 | dev_dbg(&(pdev->dev), "Probing mailbox (pdev = 0x%X)...\n", (u32) pdev); |
| 513 | |
| 514 | memset(&local_mbox, 0x0, sizeof(struct mbox)); |
| 515 | |
| 516 | /* Associate our mbox data with the platform device */ |
| 517 | res = platform_device_add_data(pdev, |
| 518 | (void *) &local_mbox, |
| 519 | sizeof(struct mbox)); |
| 520 | if (res != 0) { |
| 521 | dev_err(&(pdev->dev), |
| 522 | "Unable to allocate driver platform data!\n"); |
| 523 | goto exit; |
| 524 | } |
| 525 | |
| 526 | mbox = (struct mbox *) pdev->dev.platform_data; |
| 527 | mbox->pdev = pdev; |
| 528 | mbox->write_index = 0; |
| 529 | mbox->read_index = 0; |
| 530 | |
| 531 | INIT_LIST_HEAD(&(mbox->list)); |
| 532 | list_add_tail(&(mbox->list), &mboxs); |
| 533 | |
| 534 | sprintf(mbox->name, "%s", MBOX_NAME); |
| 535 | spin_lock_init(&mbox->lock); |
| 536 | |
| 537 | dev_info(&(pdev->dev), "Mailbox driver loaded\n"); |
| 538 | |
| 539 | exit: |
| 540 | return res; |
| 541 | } |
| 542 | |
| 543 | static struct platform_driver mbox_driver = { |
| 544 | .driver = { |
| 545 | .name = MBOX_NAME, |
| 546 | .owner = THIS_MODULE, |
| 547 | }, |
| 548 | }; |
| 549 | |
| 550 | static int __init mbox_init(void) |
| 551 | { |
| 552 | return platform_driver_probe(&mbox_driver, mbox_probe); |
| 553 | } |
| 554 | |
| 555 | module_init(mbox_init); |
| 556 | |
| 557 | void __exit mbox_exit(void) |
| 558 | { |
| 559 | platform_driver_unregister(&mbox_driver); |
| 560 | } |
| 561 | |
| 562 | module_exit(mbox_exit); |
| 563 | |
| 564 | MODULE_LICENSE("GPL"); |
| 565 | MODULE_DESCRIPTION("MBOX driver"); |