Leo Chen | 859277f | 2009-08-07 20:01:13 +0100 | [diff] [blame] | 1 | /***************************************************************************** |
| 2 | * Copyright 2004 - 2008 Broadcom Corporation. All rights reserved. |
| 3 | * |
| 4 | * Unless you and Broadcom execute a separate written software license |
| 5 | * agreement governing use of this software, this software is licensed to you |
| 6 | * under the terms of the GNU General Public License version 2, available at |
| 7 | * http://www.broadcom.com/licenses/GPLv2.php (the "GPL"). |
| 8 | * |
| 9 | * Notwithstanding the above, under no circumstances may you combine this |
| 10 | * software in any way with any other Broadcom software provided under a |
| 11 | * license other than the GPL, without Broadcom's express prior written |
| 12 | * consent. |
| 13 | *****************************************************************************/ |
| 14 | |
| 15 | /****************************************************************************/ |
| 16 | /** |
| 17 | * @file dma.c |
| 18 | * |
| 19 | * @brief Implements the DMA interface. |
| 20 | */ |
| 21 | /****************************************************************************/ |
| 22 | |
| 23 | /* ---- Include Files ---------------------------------------------------- */ |
| 24 | |
| 25 | #include <linux/module.h> |
| 26 | #include <linux/device.h> |
| 27 | #include <linux/dma-mapping.h> |
| 28 | #include <linux/interrupt.h> |
Paul Gortmaker | 4cffaf7 | 2011-07-31 17:04:15 -0400 | [diff] [blame] | 29 | #include <linux/sched.h> |
Leo Chen | 859277f | 2009-08-07 20:01:13 +0100 | [diff] [blame] | 30 | #include <linux/irqreturn.h> |
| 31 | #include <linux/proc_fs.h> |
Tejun Heo | 5a0e3ad | 2010-03-24 17:04:11 +0900 | [diff] [blame] | 32 | #include <linux/slab.h> |
Leo Chen | 859277f | 2009-08-07 20:01:13 +0100 | [diff] [blame] | 33 | |
| 34 | #include <mach/timer.h> |
| 35 | |
Leo Chen | 859277f | 2009-08-07 20:01:13 +0100 | [diff] [blame] | 36 | #include <linux/pfn.h> |
Arun Sharma | 60063497 | 2011-07-26 16:09:06 -0700 | [diff] [blame] | 37 | #include <linux/atomic.h> |
Leo Chen | 859277f | 2009-08-07 20:01:13 +0100 | [diff] [blame] | 38 | #include <mach/dma.h> |
| 39 | |
Leo Chen | 859277f | 2009-08-07 20:01:13 +0100 | [diff] [blame] | 40 | /* ---- Public Variables ------------------------------------------------- */ |
| 41 | |
| 42 | /* ---- Private Constants and Types -------------------------------------- */ |
| 43 | |
| 44 | #define MAKE_HANDLE(controllerIdx, channelIdx) (((controllerIdx) << 4) | (channelIdx)) |
| 45 | |
| 46 | #define CONTROLLER_FROM_HANDLE(handle) (((handle) >> 4) & 0x0f) |
| 47 | #define CHANNEL_FROM_HANDLE(handle) ((handle) & 0x0f) |
| 48 | |
Leo Chen | 859277f | 2009-08-07 20:01:13 +0100 | [diff] [blame] | 49 | |
| 50 | /* ---- Private Variables ------------------------------------------------ */ |
| 51 | |
| 52 | static DMA_Global_t gDMA; |
| 53 | static struct proc_dir_entry *gDmaDir; |
| 54 | |
Leo Chen | 859277f | 2009-08-07 20:01:13 +0100 | [diff] [blame] | 55 | #include "dma_device.c" |
| 56 | |
| 57 | /* ---- Private Function Prototypes -------------------------------------- */ |
| 58 | |
| 59 | /* ---- Functions ------------------------------------------------------- */ |
| 60 | |
| 61 | /****************************************************************************/ |
| 62 | /** |
Leo Chen | 859277f | 2009-08-07 20:01:13 +0100 | [diff] [blame] | 63 | * Displays information for /proc/dma/channels |
| 64 | */ |
| 65 | /****************************************************************************/ |
| 66 | |
| 67 | static int dma_proc_read_channels(char *buf, char **start, off_t offset, |
| 68 | int count, int *eof, void *data) |
| 69 | { |
| 70 | int controllerIdx; |
| 71 | int channelIdx; |
| 72 | int limit = count - 200; |
| 73 | int len = 0; |
| 74 | DMA_Channel_t *channel; |
| 75 | |
| 76 | if (down_interruptible(&gDMA.lock) < 0) { |
| 77 | return -ERESTARTSYS; |
| 78 | } |
| 79 | |
| 80 | for (controllerIdx = 0; controllerIdx < DMA_NUM_CONTROLLERS; |
| 81 | controllerIdx++) { |
| 82 | for (channelIdx = 0; channelIdx < DMA_NUM_CHANNELS; |
| 83 | channelIdx++) { |
| 84 | if (len >= limit) { |
| 85 | break; |
| 86 | } |
| 87 | |
| 88 | channel = |
| 89 | &gDMA.controller[controllerIdx].channel[channelIdx]; |
| 90 | |
| 91 | len += |
| 92 | sprintf(buf + len, "%d:%d ", controllerIdx, |
| 93 | channelIdx); |
| 94 | |
| 95 | if ((channel->flags & DMA_CHANNEL_FLAG_IS_DEDICATED) != |
| 96 | 0) { |
| 97 | len += |
| 98 | sprintf(buf + len, "Dedicated for %s ", |
| 99 | DMA_gDeviceAttribute[channel-> |
| 100 | devType].name); |
| 101 | } else { |
| 102 | len += sprintf(buf + len, "Shared "); |
| 103 | } |
| 104 | |
| 105 | if ((channel->flags & DMA_CHANNEL_FLAG_NO_ISR) != 0) { |
| 106 | len += sprintf(buf + len, "No ISR "); |
| 107 | } |
| 108 | |
| 109 | if ((channel->flags & DMA_CHANNEL_FLAG_LARGE_FIFO) != 0) { |
| 110 | len += sprintf(buf + len, "Fifo: 128 "); |
| 111 | } else { |
| 112 | len += sprintf(buf + len, "Fifo: 64 "); |
| 113 | } |
| 114 | |
| 115 | if ((channel->flags & DMA_CHANNEL_FLAG_IN_USE) != 0) { |
| 116 | len += |
| 117 | sprintf(buf + len, "InUse by %s", |
| 118 | DMA_gDeviceAttribute[channel-> |
| 119 | devType].name); |
| 120 | #if (DMA_DEBUG_TRACK_RESERVATION) |
| 121 | len += |
| 122 | sprintf(buf + len, " (%s:%d)", |
| 123 | channel->fileName, |
| 124 | channel->lineNum); |
| 125 | #endif |
| 126 | } else { |
| 127 | len += sprintf(buf + len, "Avail "); |
| 128 | } |
| 129 | |
| 130 | if (channel->lastDevType != DMA_DEVICE_NONE) { |
| 131 | len += |
| 132 | sprintf(buf + len, "Last use: %s ", |
| 133 | DMA_gDeviceAttribute[channel-> |
| 134 | lastDevType]. |
| 135 | name); |
| 136 | } |
| 137 | |
| 138 | len += sprintf(buf + len, "\n"); |
| 139 | } |
| 140 | } |
| 141 | up(&gDMA.lock); |
| 142 | *eof = 1; |
| 143 | |
| 144 | return len; |
| 145 | } |
| 146 | |
| 147 | /****************************************************************************/ |
| 148 | /** |
| 149 | * Displays information for /proc/dma/devices |
| 150 | */ |
| 151 | /****************************************************************************/ |
| 152 | |
| 153 | static int dma_proc_read_devices(char *buf, char **start, off_t offset, |
| 154 | int count, int *eof, void *data) |
| 155 | { |
| 156 | int limit = count - 200; |
| 157 | int len = 0; |
| 158 | int devIdx; |
| 159 | |
| 160 | if (down_interruptible(&gDMA.lock) < 0) { |
| 161 | return -ERESTARTSYS; |
| 162 | } |
| 163 | |
| 164 | for (devIdx = 0; devIdx < DMA_NUM_DEVICE_ENTRIES; devIdx++) { |
| 165 | DMA_DeviceAttribute_t *devAttr = &DMA_gDeviceAttribute[devIdx]; |
| 166 | |
| 167 | if (devAttr->name == NULL) { |
| 168 | continue; |
| 169 | } |
| 170 | |
| 171 | if (len >= limit) { |
| 172 | break; |
| 173 | } |
| 174 | |
| 175 | len += sprintf(buf + len, "%-12s ", devAttr->name); |
| 176 | |
| 177 | if ((devAttr->flags & DMA_DEVICE_FLAG_IS_DEDICATED) != 0) { |
| 178 | len += |
| 179 | sprintf(buf + len, "Dedicated %d:%d ", |
| 180 | devAttr->dedicatedController, |
| 181 | devAttr->dedicatedChannel); |
| 182 | } else { |
| 183 | len += sprintf(buf + len, "Shared DMA:"); |
| 184 | if ((devAttr->flags & DMA_DEVICE_FLAG_ON_DMA0) != 0) { |
| 185 | len += sprintf(buf + len, "0"); |
| 186 | } |
| 187 | if ((devAttr->flags & DMA_DEVICE_FLAG_ON_DMA1) != 0) { |
| 188 | len += sprintf(buf + len, "1"); |
| 189 | } |
| 190 | len += sprintf(buf + len, " "); |
| 191 | } |
| 192 | if ((devAttr->flags & DMA_DEVICE_FLAG_NO_ISR) != 0) { |
| 193 | len += sprintf(buf + len, "NoISR "); |
| 194 | } |
| 195 | if ((devAttr->flags & DMA_DEVICE_FLAG_ALLOW_LARGE_FIFO) != 0) { |
| 196 | len += sprintf(buf + len, "Allow-128 "); |
| 197 | } |
| 198 | |
| 199 | len += |
| 200 | sprintf(buf + len, |
| 201 | "Xfer #: %Lu Ticks: %Lu Bytes: %Lu DescLen: %u\n", |
| 202 | devAttr->numTransfers, devAttr->transferTicks, |
| 203 | devAttr->transferBytes, |
| 204 | devAttr->ring.bytesAllocated); |
| 205 | |
| 206 | } |
| 207 | |
| 208 | up(&gDMA.lock); |
| 209 | *eof = 1; |
| 210 | |
| 211 | return len; |
| 212 | } |
| 213 | |
| 214 | /****************************************************************************/ |
| 215 | /** |
| 216 | * Determines if a DMA_Device_t is "valid". |
| 217 | * |
| 218 | * @return |
| 219 | * TRUE - dma device is valid |
| 220 | * FALSE - dma device isn't valid |
| 221 | */ |
| 222 | /****************************************************************************/ |
| 223 | |
| 224 | static inline int IsDeviceValid(DMA_Device_t device) |
| 225 | { |
| 226 | return (device >= 0) && (device < DMA_NUM_DEVICE_ENTRIES); |
| 227 | } |
| 228 | |
| 229 | /****************************************************************************/ |
| 230 | /** |
| 231 | * Translates a DMA handle into a pointer to a channel. |
| 232 | * |
| 233 | * @return |
| 234 | * non-NULL - pointer to DMA_Channel_t |
| 235 | * NULL - DMA Handle was invalid |
| 236 | */ |
| 237 | /****************************************************************************/ |
| 238 | |
| 239 | static inline DMA_Channel_t *HandleToChannel(DMA_Handle_t handle) |
| 240 | { |
| 241 | int controllerIdx; |
| 242 | int channelIdx; |
| 243 | |
| 244 | controllerIdx = CONTROLLER_FROM_HANDLE(handle); |
| 245 | channelIdx = CHANNEL_FROM_HANDLE(handle); |
| 246 | |
| 247 | if ((controllerIdx > DMA_NUM_CONTROLLERS) |
| 248 | || (channelIdx > DMA_NUM_CHANNELS)) { |
| 249 | return NULL; |
| 250 | } |
| 251 | return &gDMA.controller[controllerIdx].channel[channelIdx]; |
| 252 | } |
| 253 | |
| 254 | /****************************************************************************/ |
| 255 | /** |
| 256 | * Interrupt handler which is called to process DMA interrupts. |
| 257 | */ |
| 258 | /****************************************************************************/ |
| 259 | |
| 260 | static irqreturn_t dma_interrupt_handler(int irq, void *dev_id) |
| 261 | { |
| 262 | DMA_Channel_t *channel; |
| 263 | DMA_DeviceAttribute_t *devAttr; |
| 264 | int irqStatus; |
| 265 | |
| 266 | channel = (DMA_Channel_t *) dev_id; |
| 267 | |
| 268 | /* Figure out why we were called, and knock down the interrupt */ |
| 269 | |
| 270 | irqStatus = dmacHw_getInterruptStatus(channel->dmacHwHandle); |
| 271 | dmacHw_clearInterrupt(channel->dmacHwHandle); |
| 272 | |
| 273 | if ((channel->devType < 0) |
| 274 | || (channel->devType > DMA_NUM_DEVICE_ENTRIES)) { |
| 275 | printk(KERN_ERR "dma_interrupt_handler: Invalid devType: %d\n", |
| 276 | channel->devType); |
| 277 | return IRQ_NONE; |
| 278 | } |
| 279 | devAttr = &DMA_gDeviceAttribute[channel->devType]; |
| 280 | |
| 281 | /* Update stats */ |
| 282 | |
| 283 | if ((irqStatus & dmacHw_INTERRUPT_STATUS_TRANS) != 0) { |
| 284 | devAttr->transferTicks += |
| 285 | (timer_get_tick_count() - devAttr->transferStartTime); |
| 286 | } |
| 287 | |
| 288 | if ((irqStatus & dmacHw_INTERRUPT_STATUS_ERROR) != 0) { |
| 289 | printk(KERN_ERR |
| 290 | "dma_interrupt_handler: devType :%d DMA error (%s)\n", |
| 291 | channel->devType, devAttr->name); |
| 292 | } else { |
| 293 | devAttr->numTransfers++; |
| 294 | devAttr->transferBytes += devAttr->numBytes; |
| 295 | } |
| 296 | |
| 297 | /* Call any installed handler */ |
| 298 | |
| 299 | if (devAttr->devHandler != NULL) { |
| 300 | devAttr->devHandler(channel->devType, irqStatus, |
| 301 | devAttr->userData); |
| 302 | } |
| 303 | |
| 304 | return IRQ_HANDLED; |
| 305 | } |
| 306 | |
| 307 | /****************************************************************************/ |
| 308 | /** |
| 309 | * Allocates memory to hold a descriptor ring. The descriptor ring then |
| 310 | * needs to be populated by making one or more calls to |
| 311 | * dna_add_descriptors. |
| 312 | * |
| 313 | * The returned descriptor ring will be automatically initialized. |
| 314 | * |
| 315 | * @return |
| 316 | * 0 Descriptor ring was allocated successfully |
| 317 | * -EINVAL Invalid parameters passed in |
| 318 | * -ENOMEM Unable to allocate memory for the desired number of descriptors. |
| 319 | */ |
| 320 | /****************************************************************************/ |
| 321 | |
| 322 | int dma_alloc_descriptor_ring(DMA_DescriptorRing_t *ring, /* Descriptor ring to populate */ |
| 323 | int numDescriptors /* Number of descriptors that need to be allocated. */ |
| 324 | ) { |
| 325 | size_t bytesToAlloc = dmacHw_descriptorLen(numDescriptors); |
| 326 | |
| 327 | if ((ring == NULL) || (numDescriptors <= 0)) { |
| 328 | return -EINVAL; |
| 329 | } |
| 330 | |
| 331 | ring->physAddr = 0; |
| 332 | ring->descriptorsAllocated = 0; |
| 333 | ring->bytesAllocated = 0; |
| 334 | |
| 335 | ring->virtAddr = dma_alloc_writecombine(NULL, |
| 336 | bytesToAlloc, |
| 337 | &ring->physAddr, |
| 338 | GFP_KERNEL); |
| 339 | if (ring->virtAddr == NULL) { |
| 340 | return -ENOMEM; |
| 341 | } |
| 342 | |
| 343 | ring->bytesAllocated = bytesToAlloc; |
| 344 | ring->descriptorsAllocated = numDescriptors; |
| 345 | |
| 346 | return dma_init_descriptor_ring(ring, numDescriptors); |
| 347 | } |
| 348 | |
| 349 | EXPORT_SYMBOL(dma_alloc_descriptor_ring); |
| 350 | |
| 351 | /****************************************************************************/ |
| 352 | /** |
| 353 | * Releases the memory which was previously allocated for a descriptor ring. |
| 354 | */ |
| 355 | /****************************************************************************/ |
| 356 | |
| 357 | void dma_free_descriptor_ring(DMA_DescriptorRing_t *ring /* Descriptor to release */ |
| 358 | ) { |
| 359 | if (ring->virtAddr != NULL) { |
| 360 | dma_free_writecombine(NULL, |
| 361 | ring->bytesAllocated, |
| 362 | ring->virtAddr, ring->physAddr); |
| 363 | } |
| 364 | |
| 365 | ring->bytesAllocated = 0; |
| 366 | ring->descriptorsAllocated = 0; |
| 367 | ring->virtAddr = NULL; |
| 368 | ring->physAddr = 0; |
| 369 | } |
| 370 | |
| 371 | EXPORT_SYMBOL(dma_free_descriptor_ring); |
| 372 | |
| 373 | /****************************************************************************/ |
| 374 | /** |
| 375 | * Initializes a descriptor ring, so that descriptors can be added to it. |
| 376 | * Once a descriptor ring has been allocated, it may be reinitialized for |
| 377 | * use with additional/different regions of memory. |
| 378 | * |
| 379 | * Note that if 7 descriptors are allocated, it's perfectly acceptable to |
| 380 | * initialize the ring with a smaller number of descriptors. The amount |
| 381 | * of memory allocated for the descriptor ring will not be reduced, and |
| 382 | * the descriptor ring may be reinitialized later |
| 383 | * |
| 384 | * @return |
| 385 | * 0 Descriptor ring was initialized successfully |
| 386 | * -ENOMEM The descriptor which was passed in has insufficient space |
| 387 | * to hold the desired number of descriptors. |
| 388 | */ |
| 389 | /****************************************************************************/ |
| 390 | |
| 391 | int dma_init_descriptor_ring(DMA_DescriptorRing_t *ring, /* Descriptor ring to initialize */ |
| 392 | int numDescriptors /* Number of descriptors to initialize. */ |
| 393 | ) { |
| 394 | if (ring->virtAddr == NULL) { |
| 395 | return -EINVAL; |
| 396 | } |
| 397 | if (dmacHw_initDescriptor(ring->virtAddr, |
| 398 | ring->physAddr, |
| 399 | ring->bytesAllocated, numDescriptors) < 0) { |
| 400 | printk(KERN_ERR |
| 401 | "dma_init_descriptor_ring: dmacHw_initDescriptor failed\n"); |
| 402 | return -ENOMEM; |
| 403 | } |
| 404 | |
| 405 | return 0; |
| 406 | } |
| 407 | |
| 408 | EXPORT_SYMBOL(dma_init_descriptor_ring); |
| 409 | |
| 410 | /****************************************************************************/ |
| 411 | /** |
| 412 | * Determines the number of descriptors which would be required for a |
| 413 | * transfer of the indicated memory region. |
| 414 | * |
| 415 | * This function also needs to know which DMA device this transfer will |
| 416 | * be destined for, so that the appropriate DMA configuration can be retrieved. |
| 417 | * DMA parameters such as transfer width, and whether this is a memory-to-memory |
| 418 | * or memory-to-peripheral, etc can all affect the actual number of descriptors |
| 419 | * required. |
| 420 | * |
| 421 | * @return |
| 422 | * > 0 Returns the number of descriptors required for the indicated transfer |
| 423 | * -ENODEV - Device handed in is invalid. |
| 424 | * -EINVAL Invalid parameters |
| 425 | * -ENOMEM Memory exhausted |
| 426 | */ |
| 427 | /****************************************************************************/ |
| 428 | |
| 429 | int dma_calculate_descriptor_count(DMA_Device_t device, /* DMA Device that this will be associated with */ |
| 430 | dma_addr_t srcData, /* Place to get data to write to device */ |
| 431 | dma_addr_t dstData, /* Pointer to device data address */ |
| 432 | size_t numBytes /* Number of bytes to transfer to the device */ |
| 433 | ) { |
| 434 | int numDescriptors; |
| 435 | DMA_DeviceAttribute_t *devAttr; |
| 436 | |
| 437 | if (!IsDeviceValid(device)) { |
| 438 | return -ENODEV; |
| 439 | } |
| 440 | devAttr = &DMA_gDeviceAttribute[device]; |
| 441 | |
| 442 | numDescriptors = dmacHw_calculateDescriptorCount(&devAttr->config, |
| 443 | (void *)srcData, |
| 444 | (void *)dstData, |
| 445 | numBytes); |
| 446 | if (numDescriptors < 0) { |
| 447 | printk(KERN_ERR |
| 448 | "dma_calculate_descriptor_count: dmacHw_calculateDescriptorCount failed\n"); |
| 449 | return -EINVAL; |
| 450 | } |
| 451 | |
| 452 | return numDescriptors; |
| 453 | } |
| 454 | |
| 455 | EXPORT_SYMBOL(dma_calculate_descriptor_count); |
| 456 | |
| 457 | /****************************************************************************/ |
| 458 | /** |
| 459 | * Adds a region of memory to the descriptor ring. Note that it may take |
| 460 | * multiple descriptors for each region of memory. It is the callers |
| 461 | * responsibility to allocate a sufficiently large descriptor ring. |
| 462 | * |
| 463 | * @return |
| 464 | * 0 Descriptors were added successfully |
| 465 | * -ENODEV Device handed in is invalid. |
| 466 | * -EINVAL Invalid parameters |
| 467 | * -ENOMEM Memory exhausted |
| 468 | */ |
| 469 | /****************************************************************************/ |
| 470 | |
| 471 | int dma_add_descriptors(DMA_DescriptorRing_t *ring, /* Descriptor ring to add descriptors to */ |
| 472 | DMA_Device_t device, /* DMA Device that descriptors are for */ |
| 473 | dma_addr_t srcData, /* Place to get data (memory or device) */ |
| 474 | dma_addr_t dstData, /* Place to put data (memory or device) */ |
| 475 | size_t numBytes /* Number of bytes to transfer to the device */ |
| 476 | ) { |
| 477 | int rc; |
| 478 | DMA_DeviceAttribute_t *devAttr; |
| 479 | |
| 480 | if (!IsDeviceValid(device)) { |
| 481 | return -ENODEV; |
| 482 | } |
| 483 | devAttr = &DMA_gDeviceAttribute[device]; |
| 484 | |
| 485 | rc = dmacHw_setDataDescriptor(&devAttr->config, |
| 486 | ring->virtAddr, |
| 487 | (void *)srcData, |
| 488 | (void *)dstData, numBytes); |
| 489 | if (rc < 0) { |
| 490 | printk(KERN_ERR |
| 491 | "dma_add_descriptors: dmacHw_setDataDescriptor failed with code: %d\n", |
| 492 | rc); |
| 493 | return -ENOMEM; |
| 494 | } |
| 495 | |
| 496 | return 0; |
| 497 | } |
| 498 | |
| 499 | EXPORT_SYMBOL(dma_add_descriptors); |
| 500 | |
| 501 | /****************************************************************************/ |
| 502 | /** |
| 503 | * Sets the descriptor ring associated with a device. |
| 504 | * |
| 505 | * Once set, the descriptor ring will be associated with the device, even |
| 506 | * across channel request/free calls. Passing in a NULL descriptor ring |
| 507 | * will release any descriptor ring currently associated with the device. |
| 508 | * |
| 509 | * Note: If you call dma_transfer, or one of the other dma_alloc_ functions |
| 510 | * the descriptor ring may be released and reallocated. |
| 511 | * |
| 512 | * Note: This function will release the descriptor memory for any current |
| 513 | * descriptor ring associated with this device. |
| 514 | * |
| 515 | * @return |
| 516 | * 0 Descriptors were added successfully |
| 517 | * -ENODEV Device handed in is invalid. |
| 518 | */ |
| 519 | /****************************************************************************/ |
| 520 | |
| 521 | int dma_set_device_descriptor_ring(DMA_Device_t device, /* Device to update the descriptor ring for. */ |
| 522 | DMA_DescriptorRing_t *ring /* Descriptor ring to add descriptors to */ |
| 523 | ) { |
| 524 | DMA_DeviceAttribute_t *devAttr; |
| 525 | |
| 526 | if (!IsDeviceValid(device)) { |
| 527 | return -ENODEV; |
| 528 | } |
| 529 | devAttr = &DMA_gDeviceAttribute[device]; |
| 530 | |
| 531 | /* Free the previously allocated descriptor ring */ |
| 532 | |
| 533 | dma_free_descriptor_ring(&devAttr->ring); |
| 534 | |
| 535 | if (ring != NULL) { |
| 536 | /* Copy in the new one */ |
| 537 | |
| 538 | devAttr->ring = *ring; |
| 539 | } |
| 540 | |
| 541 | /* Set things up so that if dma_transfer is called then this descriptor */ |
| 542 | /* ring will get freed. */ |
| 543 | |
| 544 | devAttr->prevSrcData = 0; |
| 545 | devAttr->prevDstData = 0; |
| 546 | devAttr->prevNumBytes = 0; |
| 547 | |
| 548 | return 0; |
| 549 | } |
| 550 | |
| 551 | EXPORT_SYMBOL(dma_set_device_descriptor_ring); |
| 552 | |
| 553 | /****************************************************************************/ |
| 554 | /** |
| 555 | * Retrieves the descriptor ring associated with a device. |
| 556 | * |
| 557 | * @return |
| 558 | * 0 Descriptors were added successfully |
| 559 | * -ENODEV Device handed in is invalid. |
| 560 | */ |
| 561 | /****************************************************************************/ |
| 562 | |
| 563 | int dma_get_device_descriptor_ring(DMA_Device_t device, /* Device to retrieve the descriptor ring for. */ |
| 564 | DMA_DescriptorRing_t *ring /* Place to store retrieved ring */ |
| 565 | ) { |
| 566 | DMA_DeviceAttribute_t *devAttr; |
| 567 | |
| 568 | memset(ring, 0, sizeof(*ring)); |
| 569 | |
| 570 | if (!IsDeviceValid(device)) { |
| 571 | return -ENODEV; |
| 572 | } |
| 573 | devAttr = &DMA_gDeviceAttribute[device]; |
| 574 | |
| 575 | *ring = devAttr->ring; |
| 576 | |
| 577 | return 0; |
| 578 | } |
| 579 | |
| 580 | EXPORT_SYMBOL(dma_get_device_descriptor_ring); |
| 581 | |
| 582 | /****************************************************************************/ |
| 583 | /** |
| 584 | * Configures a DMA channel. |
| 585 | * |
| 586 | * @return |
Lucas De Marchi | 25985ed | 2011-03-30 22:57:33 -0300 | [diff] [blame] | 587 | * >= 0 - Initialization was successful. |
Leo Chen | 859277f | 2009-08-07 20:01:13 +0100 | [diff] [blame] | 588 | * |
| 589 | * -EBUSY - Device is currently being used. |
| 590 | * -ENODEV - Device handed in is invalid. |
| 591 | */ |
| 592 | /****************************************************************************/ |
| 593 | |
| 594 | static int ConfigChannel(DMA_Handle_t handle) |
| 595 | { |
| 596 | DMA_Channel_t *channel; |
| 597 | DMA_DeviceAttribute_t *devAttr; |
| 598 | int controllerIdx; |
| 599 | |
| 600 | channel = HandleToChannel(handle); |
| 601 | if (channel == NULL) { |
| 602 | return -ENODEV; |
| 603 | } |
| 604 | devAttr = &DMA_gDeviceAttribute[channel->devType]; |
| 605 | controllerIdx = CONTROLLER_FROM_HANDLE(handle); |
| 606 | |
| 607 | if ((devAttr->flags & DMA_DEVICE_FLAG_PORT_PER_DMAC) != 0) { |
| 608 | if (devAttr->config.transferType == |
| 609 | dmacHw_TRANSFER_TYPE_MEM_TO_PERIPHERAL) { |
| 610 | devAttr->config.dstPeripheralPort = |
| 611 | devAttr->dmacPort[controllerIdx]; |
| 612 | } else if (devAttr->config.transferType == |
| 613 | dmacHw_TRANSFER_TYPE_PERIPHERAL_TO_MEM) { |
| 614 | devAttr->config.srcPeripheralPort = |
| 615 | devAttr->dmacPort[controllerIdx]; |
| 616 | } |
| 617 | } |
| 618 | |
| 619 | if (dmacHw_configChannel(channel->dmacHwHandle, &devAttr->config) != 0) { |
| 620 | printk(KERN_ERR "ConfigChannel: dmacHw_configChannel failed\n"); |
| 621 | return -EIO; |
| 622 | } |
| 623 | |
| 624 | return 0; |
| 625 | } |
| 626 | |
| 627 | /****************************************************************************/ |
| 628 | /** |
Uwe Kleine-König | b595076 | 2010-11-01 15:38:34 -0400 | [diff] [blame] | 629 | * Initializes all of the data structures associated with the DMA. |
Leo Chen | 859277f | 2009-08-07 20:01:13 +0100 | [diff] [blame] | 630 | * @return |
Lucas De Marchi | 25985ed | 2011-03-30 22:57:33 -0300 | [diff] [blame] | 631 | * >= 0 - Initialization was successful. |
Leo Chen | 859277f | 2009-08-07 20:01:13 +0100 | [diff] [blame] | 632 | * |
| 633 | * -EBUSY - Device is currently being used. |
| 634 | * -ENODEV - Device handed in is invalid. |
| 635 | */ |
| 636 | /****************************************************************************/ |
| 637 | |
| 638 | int dma_init(void) |
| 639 | { |
| 640 | int rc = 0; |
| 641 | int controllerIdx; |
| 642 | int channelIdx; |
| 643 | DMA_Device_t devIdx; |
| 644 | DMA_Channel_t *channel; |
| 645 | DMA_Handle_t dedicatedHandle; |
| 646 | |
| 647 | memset(&gDMA, 0, sizeof(gDMA)); |
| 648 | |
Thomas Gleixner | 5356d94 | 2010-09-07 14:33:52 +0000 | [diff] [blame] | 649 | sema_init(&gDMA.lock, 0); |
Leo Chen | 859277f | 2009-08-07 20:01:13 +0100 | [diff] [blame] | 650 | init_waitqueue_head(&gDMA.freeChannelQ); |
| 651 | |
| 652 | /* Initialize the Hardware */ |
| 653 | |
| 654 | dmacHw_initDma(); |
| 655 | |
| 656 | /* Start off by marking all of the DMA channels as shared. */ |
| 657 | |
| 658 | for (controllerIdx = 0; controllerIdx < DMA_NUM_CONTROLLERS; |
| 659 | controllerIdx++) { |
| 660 | for (channelIdx = 0; channelIdx < DMA_NUM_CHANNELS; |
| 661 | channelIdx++) { |
| 662 | channel = |
| 663 | &gDMA.controller[controllerIdx].channel[channelIdx]; |
| 664 | |
| 665 | channel->flags = 0; |
| 666 | channel->devType = DMA_DEVICE_NONE; |
| 667 | channel->lastDevType = DMA_DEVICE_NONE; |
| 668 | |
| 669 | #if (DMA_DEBUG_TRACK_RESERVATION) |
| 670 | channel->fileName = ""; |
| 671 | channel->lineNum = 0; |
| 672 | #endif |
| 673 | |
| 674 | channel->dmacHwHandle = |
| 675 | dmacHw_getChannelHandle(dmacHw_MAKE_CHANNEL_ID |
| 676 | (controllerIdx, |
| 677 | channelIdx)); |
| 678 | dmacHw_initChannel(channel->dmacHwHandle); |
| 679 | } |
| 680 | } |
| 681 | |
| 682 | /* Record any special attributes that channels may have */ |
| 683 | |
| 684 | gDMA.controller[0].channel[0].flags |= DMA_CHANNEL_FLAG_LARGE_FIFO; |
| 685 | gDMA.controller[0].channel[1].flags |= DMA_CHANNEL_FLAG_LARGE_FIFO; |
| 686 | gDMA.controller[1].channel[0].flags |= DMA_CHANNEL_FLAG_LARGE_FIFO; |
| 687 | gDMA.controller[1].channel[1].flags |= DMA_CHANNEL_FLAG_LARGE_FIFO; |
| 688 | |
| 689 | /* Now walk through and record the dedicated channels. */ |
| 690 | |
| 691 | for (devIdx = 0; devIdx < DMA_NUM_DEVICE_ENTRIES; devIdx++) { |
| 692 | DMA_DeviceAttribute_t *devAttr = &DMA_gDeviceAttribute[devIdx]; |
| 693 | |
| 694 | if (((devAttr->flags & DMA_DEVICE_FLAG_NO_ISR) != 0) |
| 695 | && ((devAttr->flags & DMA_DEVICE_FLAG_IS_DEDICATED) == 0)) { |
| 696 | printk(KERN_ERR |
| 697 | "DMA Device: %s Can only request NO_ISR for dedicated devices\n", |
| 698 | devAttr->name); |
| 699 | rc = -EINVAL; |
| 700 | goto out; |
| 701 | } |
| 702 | |
| 703 | if ((devAttr->flags & DMA_DEVICE_FLAG_IS_DEDICATED) != 0) { |
| 704 | /* This is a dedicated device. Mark the channel as being reserved. */ |
| 705 | |
| 706 | if (devAttr->dedicatedController >= DMA_NUM_CONTROLLERS) { |
| 707 | printk(KERN_ERR |
| 708 | "DMA Device: %s DMA Controller %d is out of range\n", |
| 709 | devAttr->name, |
| 710 | devAttr->dedicatedController); |
| 711 | rc = -EINVAL; |
| 712 | goto out; |
| 713 | } |
| 714 | |
| 715 | if (devAttr->dedicatedChannel >= DMA_NUM_CHANNELS) { |
| 716 | printk(KERN_ERR |
| 717 | "DMA Device: %s DMA Channel %d is out of range\n", |
| 718 | devAttr->name, |
| 719 | devAttr->dedicatedChannel); |
| 720 | rc = -EINVAL; |
| 721 | goto out; |
| 722 | } |
| 723 | |
| 724 | dedicatedHandle = |
| 725 | MAKE_HANDLE(devAttr->dedicatedController, |
| 726 | devAttr->dedicatedChannel); |
| 727 | channel = HandleToChannel(dedicatedHandle); |
| 728 | |
| 729 | if ((channel->flags & DMA_CHANNEL_FLAG_IS_DEDICATED) != |
| 730 | 0) { |
| 731 | printk |
| 732 | ("DMA Device: %s attempting to use same DMA Controller:Channel (%d:%d) as %s\n", |
| 733 | devAttr->name, |
| 734 | devAttr->dedicatedController, |
| 735 | devAttr->dedicatedChannel, |
| 736 | DMA_gDeviceAttribute[channel->devType]. |
| 737 | name); |
| 738 | rc = -EBUSY; |
| 739 | goto out; |
| 740 | } |
| 741 | |
| 742 | channel->flags |= DMA_CHANNEL_FLAG_IS_DEDICATED; |
| 743 | channel->devType = devIdx; |
| 744 | |
| 745 | if (devAttr->flags & DMA_DEVICE_FLAG_NO_ISR) { |
| 746 | channel->flags |= DMA_CHANNEL_FLAG_NO_ISR; |
| 747 | } |
| 748 | |
| 749 | /* For dedicated channels, we can go ahead and configure the DMA channel now */ |
| 750 | /* as well. */ |
| 751 | |
| 752 | ConfigChannel(dedicatedHandle); |
| 753 | } |
| 754 | } |
| 755 | |
| 756 | /* Go through and register the interrupt handlers */ |
| 757 | |
| 758 | for (controllerIdx = 0; controllerIdx < DMA_NUM_CONTROLLERS; |
| 759 | controllerIdx++) { |
| 760 | for (channelIdx = 0; channelIdx < DMA_NUM_CHANNELS; |
| 761 | channelIdx++) { |
| 762 | channel = |
| 763 | &gDMA.controller[controllerIdx].channel[channelIdx]; |
| 764 | |
| 765 | if ((channel->flags & DMA_CHANNEL_FLAG_NO_ISR) == 0) { |
| 766 | snprintf(channel->name, sizeof(channel->name), |
| 767 | "dma %d:%d %s", controllerIdx, |
| 768 | channelIdx, |
| 769 | channel->devType == |
| 770 | DMA_DEVICE_NONE ? "" : |
| 771 | DMA_gDeviceAttribute[channel->devType]. |
| 772 | name); |
| 773 | |
| 774 | rc = |
| 775 | request_irq(IRQ_DMA0C0 + |
| 776 | (controllerIdx * |
| 777 | DMA_NUM_CHANNELS) + |
| 778 | channelIdx, |
| 779 | dma_interrupt_handler, |
| 780 | IRQF_DISABLED, channel->name, |
| 781 | channel); |
| 782 | if (rc != 0) { |
| 783 | printk(KERN_ERR |
| 784 | "request_irq for IRQ_DMA%dC%d failed\n", |
| 785 | controllerIdx, channelIdx); |
| 786 | } |
| 787 | } |
| 788 | } |
| 789 | } |
| 790 | |
| 791 | /* Create /proc/dma/channels and /proc/dma/devices */ |
| 792 | |
Al Viro | e55d92b | 2011-07-24 02:07:46 -0400 | [diff] [blame] | 793 | gDmaDir = proc_mkdir("dma", NULL); |
Leo Chen | 859277f | 2009-08-07 20:01:13 +0100 | [diff] [blame] | 794 | |
| 795 | if (gDmaDir == NULL) { |
| 796 | printk(KERN_ERR "Unable to create /proc/dma\n"); |
| 797 | } else { |
| 798 | create_proc_read_entry("channels", 0, gDmaDir, |
| 799 | dma_proc_read_channels, NULL); |
| 800 | create_proc_read_entry("devices", 0, gDmaDir, |
| 801 | dma_proc_read_devices, NULL); |
Leo Chen | 859277f | 2009-08-07 20:01:13 +0100 | [diff] [blame] | 802 | } |
| 803 | |
| 804 | out: |
| 805 | |
| 806 | up(&gDMA.lock); |
| 807 | |
| 808 | return rc; |
| 809 | } |
| 810 | |
| 811 | /****************************************************************************/ |
| 812 | /** |
| 813 | * Reserves a channel for use with @a dev. If the device is setup to use |
| 814 | * a shared channel, then this function will block until a free channel |
| 815 | * becomes available. |
| 816 | * |
| 817 | * @return |
| 818 | * >= 0 - A valid DMA Handle. |
| 819 | * -EBUSY - Device is currently being used. |
| 820 | * -ENODEV - Device handed in is invalid. |
| 821 | */ |
| 822 | /****************************************************************************/ |
| 823 | |
| 824 | #if (DMA_DEBUG_TRACK_RESERVATION) |
| 825 | DMA_Handle_t dma_request_channel_dbg |
| 826 | (DMA_Device_t dev, const char *fileName, int lineNum) |
| 827 | #else |
| 828 | DMA_Handle_t dma_request_channel(DMA_Device_t dev) |
| 829 | #endif |
| 830 | { |
| 831 | DMA_Handle_t handle; |
| 832 | DMA_DeviceAttribute_t *devAttr; |
| 833 | DMA_Channel_t *channel; |
| 834 | int controllerIdx; |
| 835 | int controllerIdx2; |
| 836 | int channelIdx; |
| 837 | |
| 838 | if (down_interruptible(&gDMA.lock) < 0) { |
| 839 | return -ERESTARTSYS; |
| 840 | } |
| 841 | |
| 842 | if ((dev < 0) || (dev >= DMA_NUM_DEVICE_ENTRIES)) { |
| 843 | handle = -ENODEV; |
| 844 | goto out; |
| 845 | } |
| 846 | devAttr = &DMA_gDeviceAttribute[dev]; |
| 847 | |
| 848 | #if (DMA_DEBUG_TRACK_RESERVATION) |
| 849 | { |
| 850 | char *s; |
| 851 | |
| 852 | s = strrchr(fileName, '/'); |
| 853 | if (s != NULL) { |
| 854 | fileName = s + 1; |
| 855 | } |
| 856 | } |
| 857 | #endif |
| 858 | if ((devAttr->flags & DMA_DEVICE_FLAG_IN_USE) != 0) { |
| 859 | /* This device has already been requested and not been freed */ |
| 860 | |
| 861 | printk(KERN_ERR "%s: device %s is already requested\n", |
| 862 | __func__, devAttr->name); |
| 863 | handle = -EBUSY; |
| 864 | goto out; |
| 865 | } |
| 866 | |
| 867 | if ((devAttr->flags & DMA_DEVICE_FLAG_IS_DEDICATED) != 0) { |
| 868 | /* This device has a dedicated channel. */ |
| 869 | |
| 870 | channel = |
| 871 | &gDMA.controller[devAttr->dedicatedController]. |
| 872 | channel[devAttr->dedicatedChannel]; |
| 873 | if ((channel->flags & DMA_CHANNEL_FLAG_IN_USE) != 0) { |
| 874 | handle = -EBUSY; |
| 875 | goto out; |
| 876 | } |
| 877 | |
| 878 | channel->flags |= DMA_CHANNEL_FLAG_IN_USE; |
| 879 | devAttr->flags |= DMA_DEVICE_FLAG_IN_USE; |
| 880 | |
| 881 | #if (DMA_DEBUG_TRACK_RESERVATION) |
| 882 | channel->fileName = fileName; |
| 883 | channel->lineNum = lineNum; |
| 884 | #endif |
| 885 | handle = |
| 886 | MAKE_HANDLE(devAttr->dedicatedController, |
| 887 | devAttr->dedicatedChannel); |
| 888 | goto out; |
| 889 | } |
| 890 | |
| 891 | /* This device needs to use one of the shared channels. */ |
| 892 | |
| 893 | handle = DMA_INVALID_HANDLE; |
| 894 | while (handle == DMA_INVALID_HANDLE) { |
| 895 | /* Scan through the shared channels and see if one is available */ |
| 896 | |
| 897 | for (controllerIdx2 = 0; controllerIdx2 < DMA_NUM_CONTROLLERS; |
| 898 | controllerIdx2++) { |
| 899 | /* Check to see if we should try on controller 1 first. */ |
| 900 | |
| 901 | controllerIdx = controllerIdx2; |
| 902 | if ((devAttr-> |
| 903 | flags & DMA_DEVICE_FLAG_ALLOC_DMA1_FIRST) != 0) { |
| 904 | controllerIdx = 1 - controllerIdx; |
| 905 | } |
| 906 | |
| 907 | /* See if the device is available on the controller being tested */ |
| 908 | |
| 909 | if ((devAttr-> |
| 910 | flags & (DMA_DEVICE_FLAG_ON_DMA0 << controllerIdx)) |
| 911 | != 0) { |
| 912 | for (channelIdx = 0; |
| 913 | channelIdx < DMA_NUM_CHANNELS; |
| 914 | channelIdx++) { |
| 915 | channel = |
| 916 | &gDMA.controller[controllerIdx]. |
| 917 | channel[channelIdx]; |
| 918 | |
| 919 | if (((channel-> |
| 920 | flags & |
| 921 | DMA_CHANNEL_FLAG_IS_DEDICATED) == |
| 922 | 0) |
| 923 | && |
| 924 | ((channel-> |
| 925 | flags & DMA_CHANNEL_FLAG_IN_USE) |
| 926 | == 0)) { |
| 927 | if (((channel-> |
| 928 | flags & |
| 929 | DMA_CHANNEL_FLAG_LARGE_FIFO) |
| 930 | != 0) |
| 931 | && |
| 932 | ((devAttr-> |
| 933 | flags & |
| 934 | DMA_DEVICE_FLAG_ALLOW_LARGE_FIFO) |
| 935 | == 0)) { |
| 936 | /* This channel is a large fifo - don't tie it up */ |
| 937 | /* with devices that we don't want using it. */ |
| 938 | |
| 939 | continue; |
| 940 | } |
| 941 | |
| 942 | channel->flags |= |
| 943 | DMA_CHANNEL_FLAG_IN_USE; |
| 944 | channel->devType = dev; |
| 945 | devAttr->flags |= |
| 946 | DMA_DEVICE_FLAG_IN_USE; |
| 947 | |
| 948 | #if (DMA_DEBUG_TRACK_RESERVATION) |
| 949 | channel->fileName = fileName; |
| 950 | channel->lineNum = lineNum; |
| 951 | #endif |
| 952 | handle = |
| 953 | MAKE_HANDLE(controllerIdx, |
| 954 | channelIdx); |
| 955 | |
| 956 | /* Now that we've reserved the channel - we can go ahead and configure it */ |
| 957 | |
| 958 | if (ConfigChannel(handle) != 0) { |
| 959 | handle = -EIO; |
| 960 | printk(KERN_ERR |
| 961 | "dma_request_channel: ConfigChannel failed\n"); |
| 962 | } |
| 963 | goto out; |
| 964 | } |
| 965 | } |
| 966 | } |
| 967 | } |
| 968 | |
| 969 | /* No channels are currently available. Let's wait for one to free up. */ |
| 970 | |
| 971 | { |
| 972 | DEFINE_WAIT(wait); |
| 973 | |
| 974 | prepare_to_wait(&gDMA.freeChannelQ, &wait, |
| 975 | TASK_INTERRUPTIBLE); |
| 976 | up(&gDMA.lock); |
| 977 | schedule(); |
| 978 | finish_wait(&gDMA.freeChannelQ, &wait); |
| 979 | |
| 980 | if (signal_pending(current)) { |
| 981 | /* We don't currently hold gDMA.lock, so we return directly */ |
| 982 | |
| 983 | return -ERESTARTSYS; |
| 984 | } |
| 985 | } |
| 986 | |
| 987 | if (down_interruptible(&gDMA.lock)) { |
| 988 | return -ERESTARTSYS; |
| 989 | } |
| 990 | } |
| 991 | |
| 992 | out: |
| 993 | up(&gDMA.lock); |
| 994 | |
| 995 | return handle; |
| 996 | } |
| 997 | |
| 998 | /* Create both _dbg and non _dbg functions for modules. */ |
| 999 | |
| 1000 | #if (DMA_DEBUG_TRACK_RESERVATION) |
| 1001 | #undef dma_request_channel |
| 1002 | DMA_Handle_t dma_request_channel(DMA_Device_t dev) |
| 1003 | { |
| 1004 | return dma_request_channel_dbg(dev, __FILE__, __LINE__); |
| 1005 | } |
| 1006 | |
| 1007 | EXPORT_SYMBOL(dma_request_channel_dbg); |
| 1008 | #endif |
| 1009 | EXPORT_SYMBOL(dma_request_channel); |
| 1010 | |
| 1011 | /****************************************************************************/ |
| 1012 | /** |
| 1013 | * Frees a previously allocated DMA Handle. |
| 1014 | */ |
| 1015 | /****************************************************************************/ |
| 1016 | |
| 1017 | int dma_free_channel(DMA_Handle_t handle /* DMA handle. */ |
| 1018 | ) { |
| 1019 | int rc = 0; |
| 1020 | DMA_Channel_t *channel; |
| 1021 | DMA_DeviceAttribute_t *devAttr; |
| 1022 | |
| 1023 | if (down_interruptible(&gDMA.lock) < 0) { |
| 1024 | return -ERESTARTSYS; |
| 1025 | } |
| 1026 | |
| 1027 | channel = HandleToChannel(handle); |
| 1028 | if (channel == NULL) { |
| 1029 | rc = -EINVAL; |
| 1030 | goto out; |
| 1031 | } |
| 1032 | |
| 1033 | devAttr = &DMA_gDeviceAttribute[channel->devType]; |
| 1034 | |
| 1035 | if ((channel->flags & DMA_CHANNEL_FLAG_IS_DEDICATED) == 0) { |
| 1036 | channel->lastDevType = channel->devType; |
| 1037 | channel->devType = DMA_DEVICE_NONE; |
| 1038 | } |
| 1039 | channel->flags &= ~DMA_CHANNEL_FLAG_IN_USE; |
| 1040 | devAttr->flags &= ~DMA_DEVICE_FLAG_IN_USE; |
| 1041 | |
| 1042 | out: |
| 1043 | up(&gDMA.lock); |
| 1044 | |
| 1045 | wake_up_interruptible(&gDMA.freeChannelQ); |
| 1046 | |
| 1047 | return rc; |
| 1048 | } |
| 1049 | |
| 1050 | EXPORT_SYMBOL(dma_free_channel); |
| 1051 | |
| 1052 | /****************************************************************************/ |
| 1053 | /** |
| 1054 | * Determines if a given device has been configured as using a shared |
| 1055 | * channel. |
| 1056 | * |
| 1057 | * @return |
| 1058 | * 0 Device uses a dedicated channel |
| 1059 | * > zero Device uses a shared channel |
| 1060 | * < zero Error code |
| 1061 | */ |
| 1062 | /****************************************************************************/ |
| 1063 | |
| 1064 | int dma_device_is_channel_shared(DMA_Device_t device /* Device to check. */ |
| 1065 | ) { |
| 1066 | DMA_DeviceAttribute_t *devAttr; |
| 1067 | |
| 1068 | if (!IsDeviceValid(device)) { |
| 1069 | return -ENODEV; |
| 1070 | } |
| 1071 | devAttr = &DMA_gDeviceAttribute[device]; |
| 1072 | |
| 1073 | return ((devAttr->flags & DMA_DEVICE_FLAG_IS_DEDICATED) == 0); |
| 1074 | } |
| 1075 | |
| 1076 | EXPORT_SYMBOL(dma_device_is_channel_shared); |
| 1077 | |
| 1078 | /****************************************************************************/ |
| 1079 | /** |
| 1080 | * Allocates buffers for the descriptors. This is normally done automatically |
| 1081 | * but needs to be done explicitly when initiating a dma from interrupt |
| 1082 | * context. |
| 1083 | * |
| 1084 | * @return |
| 1085 | * 0 Descriptors were allocated successfully |
| 1086 | * -EINVAL Invalid device type for this kind of transfer |
| 1087 | * (i.e. the device is _MEM_TO_DEV and not _DEV_TO_MEM) |
| 1088 | * -ENOMEM Memory exhausted |
| 1089 | */ |
| 1090 | /****************************************************************************/ |
| 1091 | |
| 1092 | int dma_alloc_descriptors(DMA_Handle_t handle, /* DMA Handle */ |
| 1093 | dmacHw_TRANSFER_TYPE_e transferType, /* Type of transfer being performed */ |
| 1094 | dma_addr_t srcData, /* Place to get data to write to device */ |
| 1095 | dma_addr_t dstData, /* Pointer to device data address */ |
| 1096 | size_t numBytes /* Number of bytes to transfer to the device */ |
| 1097 | ) { |
| 1098 | DMA_Channel_t *channel; |
| 1099 | DMA_DeviceAttribute_t *devAttr; |
| 1100 | int numDescriptors; |
| 1101 | size_t ringBytesRequired; |
| 1102 | int rc = 0; |
| 1103 | |
| 1104 | channel = HandleToChannel(handle); |
| 1105 | if (channel == NULL) { |
| 1106 | return -ENODEV; |
| 1107 | } |
| 1108 | |
| 1109 | devAttr = &DMA_gDeviceAttribute[channel->devType]; |
| 1110 | |
| 1111 | if (devAttr->config.transferType != transferType) { |
| 1112 | return -EINVAL; |
| 1113 | } |
| 1114 | |
| 1115 | /* Figure out how many descriptors we need. */ |
| 1116 | |
| 1117 | /* printk("srcData: 0x%08x dstData: 0x%08x, numBytes: %d\n", */ |
| 1118 | /* srcData, dstData, numBytes); */ |
| 1119 | |
| 1120 | numDescriptors = dmacHw_calculateDescriptorCount(&devAttr->config, |
| 1121 | (void *)srcData, |
| 1122 | (void *)dstData, |
| 1123 | numBytes); |
| 1124 | if (numDescriptors < 0) { |
| 1125 | printk(KERN_ERR "%s: dmacHw_calculateDescriptorCount failed\n", |
| 1126 | __func__); |
| 1127 | return -EINVAL; |
| 1128 | } |
| 1129 | |
| 1130 | /* Check to see if we can reuse the existing descriptor ring, or if we need to allocate */ |
| 1131 | /* a new one. */ |
| 1132 | |
| 1133 | ringBytesRequired = dmacHw_descriptorLen(numDescriptors); |
| 1134 | |
| 1135 | /* printk("ringBytesRequired: %d\n", ringBytesRequired); */ |
| 1136 | |
| 1137 | if (ringBytesRequired > devAttr->ring.bytesAllocated) { |
| 1138 | /* Make sure that this code path is never taken from interrupt context. */ |
| 1139 | /* It's OK for an interrupt to initiate a DMA transfer, but the descriptor */ |
| 1140 | /* allocation needs to have already been done. */ |
| 1141 | |
| 1142 | might_sleep(); |
| 1143 | |
| 1144 | /* Free the old descriptor ring and allocate a new one. */ |
| 1145 | |
| 1146 | dma_free_descriptor_ring(&devAttr->ring); |
| 1147 | |
| 1148 | /* And allocate a new one. */ |
| 1149 | |
| 1150 | rc = |
| 1151 | dma_alloc_descriptor_ring(&devAttr->ring, |
| 1152 | numDescriptors); |
| 1153 | if (rc < 0) { |
| 1154 | printk(KERN_ERR |
| 1155 | "%s: dma_alloc_descriptor_ring(%d) failed\n", |
| 1156 | __func__, numDescriptors); |
| 1157 | return rc; |
| 1158 | } |
| 1159 | /* Setup the descriptor for this transfer */ |
| 1160 | |
| 1161 | if (dmacHw_initDescriptor(devAttr->ring.virtAddr, |
| 1162 | devAttr->ring.physAddr, |
| 1163 | devAttr->ring.bytesAllocated, |
| 1164 | numDescriptors) < 0) { |
| 1165 | printk(KERN_ERR "%s: dmacHw_initDescriptor failed\n", |
| 1166 | __func__); |
| 1167 | return -EINVAL; |
| 1168 | } |
| 1169 | } else { |
| 1170 | /* We've already got enough ring buffer allocated. All we need to do is reset */ |
| 1171 | /* any control information, just in case the previous DMA was stopped. */ |
| 1172 | |
| 1173 | dmacHw_resetDescriptorControl(devAttr->ring.virtAddr); |
| 1174 | } |
| 1175 | |
| 1176 | /* dma_alloc/free both set the prevSrc/DstData to 0. If they happen to be the same */ |
| 1177 | /* as last time, then we don't need to call setDataDescriptor again. */ |
| 1178 | |
| 1179 | if (dmacHw_setDataDescriptor(&devAttr->config, |
| 1180 | devAttr->ring.virtAddr, |
| 1181 | (void *)srcData, |
| 1182 | (void *)dstData, numBytes) < 0) { |
| 1183 | printk(KERN_ERR "%s: dmacHw_setDataDescriptor failed\n", |
| 1184 | __func__); |
| 1185 | return -EINVAL; |
| 1186 | } |
| 1187 | |
| 1188 | /* Remember the critical information for this transfer so that we can eliminate */ |
| 1189 | /* another call to dma_alloc_descriptors if the caller reuses the same buffers */ |
| 1190 | |
| 1191 | devAttr->prevSrcData = srcData; |
| 1192 | devAttr->prevDstData = dstData; |
| 1193 | devAttr->prevNumBytes = numBytes; |
| 1194 | |
| 1195 | return 0; |
| 1196 | } |
| 1197 | |
| 1198 | EXPORT_SYMBOL(dma_alloc_descriptors); |
| 1199 | |
| 1200 | /****************************************************************************/ |
| 1201 | /** |
| 1202 | * Allocates and sets up descriptors for a double buffered circular buffer. |
| 1203 | * |
| 1204 | * This is primarily intended to be used for things like the ingress samples |
| 1205 | * from a microphone. |
| 1206 | * |
| 1207 | * @return |
| 1208 | * > 0 Number of descriptors actually allocated. |
| 1209 | * -EINVAL Invalid device type for this kind of transfer |
| 1210 | * (i.e. the device is _MEM_TO_DEV and not _DEV_TO_MEM) |
| 1211 | * -ENOMEM Memory exhausted |
| 1212 | */ |
| 1213 | /****************************************************************************/ |
| 1214 | |
| 1215 | int dma_alloc_double_dst_descriptors(DMA_Handle_t handle, /* DMA Handle */ |
| 1216 | dma_addr_t srcData, /* Physical address of source data */ |
| 1217 | dma_addr_t dstData1, /* Physical address of first destination buffer */ |
| 1218 | dma_addr_t dstData2, /* Physical address of second destination buffer */ |
| 1219 | size_t numBytes /* Number of bytes in each destination buffer */ |
| 1220 | ) { |
| 1221 | DMA_Channel_t *channel; |
| 1222 | DMA_DeviceAttribute_t *devAttr; |
| 1223 | int numDst1Descriptors; |
| 1224 | int numDst2Descriptors; |
| 1225 | int numDescriptors; |
| 1226 | size_t ringBytesRequired; |
| 1227 | int rc = 0; |
| 1228 | |
| 1229 | channel = HandleToChannel(handle); |
| 1230 | if (channel == NULL) { |
| 1231 | return -ENODEV; |
| 1232 | } |
| 1233 | |
| 1234 | devAttr = &DMA_gDeviceAttribute[channel->devType]; |
| 1235 | |
| 1236 | /* Figure out how many descriptors we need. */ |
| 1237 | |
| 1238 | /* printk("srcData: 0x%08x dstData: 0x%08x, numBytes: %d\n", */ |
| 1239 | /* srcData, dstData, numBytes); */ |
| 1240 | |
| 1241 | numDst1Descriptors = |
| 1242 | dmacHw_calculateDescriptorCount(&devAttr->config, (void *)srcData, |
| 1243 | (void *)dstData1, numBytes); |
| 1244 | if (numDst1Descriptors < 0) { |
| 1245 | return -EINVAL; |
| 1246 | } |
| 1247 | numDst2Descriptors = |
| 1248 | dmacHw_calculateDescriptorCount(&devAttr->config, (void *)srcData, |
| 1249 | (void *)dstData2, numBytes); |
| 1250 | if (numDst2Descriptors < 0) { |
| 1251 | return -EINVAL; |
| 1252 | } |
| 1253 | numDescriptors = numDst1Descriptors + numDst2Descriptors; |
| 1254 | /* printk("numDescriptors: %d\n", numDescriptors); */ |
| 1255 | |
| 1256 | /* Check to see if we can reuse the existing descriptor ring, or if we need to allocate */ |
| 1257 | /* a new one. */ |
| 1258 | |
| 1259 | ringBytesRequired = dmacHw_descriptorLen(numDescriptors); |
| 1260 | |
| 1261 | /* printk("ringBytesRequired: %d\n", ringBytesRequired); */ |
| 1262 | |
| 1263 | if (ringBytesRequired > devAttr->ring.bytesAllocated) { |
| 1264 | /* Make sure that this code path is never taken from interrupt context. */ |
| 1265 | /* It's OK for an interrupt to initiate a DMA transfer, but the descriptor */ |
| 1266 | /* allocation needs to have already been done. */ |
| 1267 | |
| 1268 | might_sleep(); |
| 1269 | |
| 1270 | /* Free the old descriptor ring and allocate a new one. */ |
| 1271 | |
| 1272 | dma_free_descriptor_ring(&devAttr->ring); |
| 1273 | |
| 1274 | /* And allocate a new one. */ |
| 1275 | |
| 1276 | rc = |
| 1277 | dma_alloc_descriptor_ring(&devAttr->ring, |
| 1278 | numDescriptors); |
| 1279 | if (rc < 0) { |
| 1280 | printk(KERN_ERR |
| 1281 | "%s: dma_alloc_descriptor_ring(%d) failed\n", |
| 1282 | __func__, ringBytesRequired); |
| 1283 | return rc; |
| 1284 | } |
| 1285 | } |
| 1286 | |
| 1287 | /* Setup the descriptor for this transfer. Since this function is used with */ |
| 1288 | /* CONTINUOUS DMA operations, we need to reinitialize every time, otherwise */ |
| 1289 | /* setDataDescriptor will keep trying to append onto the end. */ |
| 1290 | |
| 1291 | if (dmacHw_initDescriptor(devAttr->ring.virtAddr, |
| 1292 | devAttr->ring.physAddr, |
| 1293 | devAttr->ring.bytesAllocated, |
| 1294 | numDescriptors) < 0) { |
| 1295 | printk(KERN_ERR "%s: dmacHw_initDescriptor failed\n", __func__); |
| 1296 | return -EINVAL; |
| 1297 | } |
| 1298 | |
| 1299 | /* dma_alloc/free both set the prevSrc/DstData to 0. If they happen to be the same */ |
| 1300 | /* as last time, then we don't need to call setDataDescriptor again. */ |
| 1301 | |
| 1302 | if (dmacHw_setDataDescriptor(&devAttr->config, |
| 1303 | devAttr->ring.virtAddr, |
| 1304 | (void *)srcData, |
| 1305 | (void *)dstData1, numBytes) < 0) { |
| 1306 | printk(KERN_ERR "%s: dmacHw_setDataDescriptor 1 failed\n", |
| 1307 | __func__); |
| 1308 | return -EINVAL; |
| 1309 | } |
| 1310 | if (dmacHw_setDataDescriptor(&devAttr->config, |
| 1311 | devAttr->ring.virtAddr, |
| 1312 | (void *)srcData, |
| 1313 | (void *)dstData2, numBytes) < 0) { |
| 1314 | printk(KERN_ERR "%s: dmacHw_setDataDescriptor 2 failed\n", |
| 1315 | __func__); |
| 1316 | return -EINVAL; |
| 1317 | } |
| 1318 | |
| 1319 | /* You should use dma_start_transfer rather than dma_transfer_xxx so we don't */ |
| 1320 | /* try to make the 'prev' variables right. */ |
| 1321 | |
| 1322 | devAttr->prevSrcData = 0; |
| 1323 | devAttr->prevDstData = 0; |
| 1324 | devAttr->prevNumBytes = 0; |
| 1325 | |
| 1326 | return numDescriptors; |
| 1327 | } |
| 1328 | |
| 1329 | EXPORT_SYMBOL(dma_alloc_double_dst_descriptors); |
| 1330 | |
| 1331 | /****************************************************************************/ |
| 1332 | /** |
| 1333 | * Initiates a transfer when the descriptors have already been setup. |
| 1334 | * |
| 1335 | * This is a special case, and normally, the dma_transfer_xxx functions should |
| 1336 | * be used. |
| 1337 | * |
| 1338 | * @return |
| 1339 | * 0 Transfer was started successfully |
| 1340 | * -ENODEV Invalid handle |
| 1341 | */ |
| 1342 | /****************************************************************************/ |
| 1343 | |
| 1344 | int dma_start_transfer(DMA_Handle_t handle) |
| 1345 | { |
| 1346 | DMA_Channel_t *channel; |
| 1347 | DMA_DeviceAttribute_t *devAttr; |
| 1348 | |
| 1349 | channel = HandleToChannel(handle); |
| 1350 | if (channel == NULL) { |
| 1351 | return -ENODEV; |
| 1352 | } |
| 1353 | devAttr = &DMA_gDeviceAttribute[channel->devType]; |
| 1354 | |
| 1355 | dmacHw_initiateTransfer(channel->dmacHwHandle, &devAttr->config, |
| 1356 | devAttr->ring.virtAddr); |
| 1357 | |
| 1358 | /* Since we got this far, everything went successfully */ |
| 1359 | |
| 1360 | return 0; |
| 1361 | } |
| 1362 | |
| 1363 | EXPORT_SYMBOL(dma_start_transfer); |
| 1364 | |
| 1365 | /****************************************************************************/ |
| 1366 | /** |
| 1367 | * Stops a previously started DMA transfer. |
| 1368 | * |
| 1369 | * @return |
| 1370 | * 0 Transfer was stopped successfully |
| 1371 | * -ENODEV Invalid handle |
| 1372 | */ |
| 1373 | /****************************************************************************/ |
| 1374 | |
| 1375 | int dma_stop_transfer(DMA_Handle_t handle) |
| 1376 | { |
| 1377 | DMA_Channel_t *channel; |
| 1378 | |
| 1379 | channel = HandleToChannel(handle); |
| 1380 | if (channel == NULL) { |
| 1381 | return -ENODEV; |
| 1382 | } |
| 1383 | |
| 1384 | dmacHw_stopTransfer(channel->dmacHwHandle); |
| 1385 | |
| 1386 | return 0; |
| 1387 | } |
| 1388 | |
| 1389 | EXPORT_SYMBOL(dma_stop_transfer); |
| 1390 | |
| 1391 | /****************************************************************************/ |
| 1392 | /** |
| 1393 | * Waits for a DMA to complete by polling. This function is only intended |
| 1394 | * to be used for testing. Interrupts should be used for most DMA operations. |
| 1395 | */ |
| 1396 | /****************************************************************************/ |
| 1397 | |
| 1398 | int dma_wait_transfer_done(DMA_Handle_t handle) |
| 1399 | { |
| 1400 | DMA_Channel_t *channel; |
| 1401 | dmacHw_TRANSFER_STATUS_e status; |
| 1402 | |
| 1403 | channel = HandleToChannel(handle); |
| 1404 | if (channel == NULL) { |
| 1405 | return -ENODEV; |
| 1406 | } |
| 1407 | |
| 1408 | while ((status = |
| 1409 | dmacHw_transferCompleted(channel->dmacHwHandle)) == |
| 1410 | dmacHw_TRANSFER_STATUS_BUSY) { |
| 1411 | ; |
| 1412 | } |
| 1413 | |
| 1414 | if (status == dmacHw_TRANSFER_STATUS_ERROR) { |
| 1415 | printk(KERN_ERR "%s: DMA transfer failed\n", __func__); |
| 1416 | return -EIO; |
| 1417 | } |
| 1418 | return 0; |
| 1419 | } |
| 1420 | |
| 1421 | EXPORT_SYMBOL(dma_wait_transfer_done); |
| 1422 | |
| 1423 | /****************************************************************************/ |
| 1424 | /** |
| 1425 | * Initiates a DMA, allocating the descriptors as required. |
| 1426 | * |
| 1427 | * @return |
| 1428 | * 0 Transfer was started successfully |
| 1429 | * -EINVAL Invalid device type for this kind of transfer |
| 1430 | * (i.e. the device is _DEV_TO_MEM and not _MEM_TO_DEV) |
| 1431 | */ |
| 1432 | /****************************************************************************/ |
| 1433 | |
| 1434 | int dma_transfer(DMA_Handle_t handle, /* DMA Handle */ |
| 1435 | dmacHw_TRANSFER_TYPE_e transferType, /* Type of transfer being performed */ |
| 1436 | dma_addr_t srcData, /* Place to get data to write to device */ |
| 1437 | dma_addr_t dstData, /* Pointer to device data address */ |
| 1438 | size_t numBytes /* Number of bytes to transfer to the device */ |
| 1439 | ) { |
| 1440 | DMA_Channel_t *channel; |
| 1441 | DMA_DeviceAttribute_t *devAttr; |
| 1442 | int rc = 0; |
| 1443 | |
| 1444 | channel = HandleToChannel(handle); |
| 1445 | if (channel == NULL) { |
| 1446 | return -ENODEV; |
| 1447 | } |
| 1448 | |
| 1449 | devAttr = &DMA_gDeviceAttribute[channel->devType]; |
| 1450 | |
| 1451 | if (devAttr->config.transferType != transferType) { |
| 1452 | return -EINVAL; |
| 1453 | } |
| 1454 | |
| 1455 | /* We keep track of the information about the previous request for this */ |
| 1456 | /* device, and if the attributes match, then we can use the descriptors we setup */ |
| 1457 | /* the last time, and not have to reinitialize everything. */ |
| 1458 | |
| 1459 | { |
| 1460 | rc = |
| 1461 | dma_alloc_descriptors(handle, transferType, srcData, |
| 1462 | dstData, numBytes); |
| 1463 | if (rc != 0) { |
| 1464 | return rc; |
| 1465 | } |
| 1466 | } |
| 1467 | |
| 1468 | /* And kick off the transfer */ |
| 1469 | |
| 1470 | devAttr->numBytes = numBytes; |
| 1471 | devAttr->transferStartTime = timer_get_tick_count(); |
| 1472 | |
| 1473 | dmacHw_initiateTransfer(channel->dmacHwHandle, &devAttr->config, |
| 1474 | devAttr->ring.virtAddr); |
| 1475 | |
| 1476 | /* Since we got this far, everything went successfully */ |
| 1477 | |
| 1478 | return 0; |
| 1479 | } |
| 1480 | |
| 1481 | EXPORT_SYMBOL(dma_transfer); |
| 1482 | |
| 1483 | /****************************************************************************/ |
| 1484 | /** |
| 1485 | * Set the callback function which will be called when a transfer completes. |
| 1486 | * If a NULL callback function is set, then no callback will occur. |
| 1487 | * |
| 1488 | * @note @a devHandler will be called from IRQ context. |
| 1489 | * |
| 1490 | * @return |
| 1491 | * 0 - Success |
| 1492 | * -ENODEV - Device handed in is invalid. |
| 1493 | */ |
| 1494 | /****************************************************************************/ |
| 1495 | |
| 1496 | int dma_set_device_handler(DMA_Device_t dev, /* Device to set the callback for. */ |
| 1497 | DMA_DeviceHandler_t devHandler, /* Function to call when the DMA completes */ |
| 1498 | void *userData /* Pointer which will be passed to devHandler. */ |
| 1499 | ) { |
| 1500 | DMA_DeviceAttribute_t *devAttr; |
| 1501 | unsigned long flags; |
| 1502 | |
| 1503 | if (!IsDeviceValid(dev)) { |
| 1504 | return -ENODEV; |
| 1505 | } |
| 1506 | devAttr = &DMA_gDeviceAttribute[dev]; |
| 1507 | |
| 1508 | local_irq_save(flags); |
| 1509 | |
| 1510 | devAttr->userData = userData; |
| 1511 | devAttr->devHandler = devHandler; |
| 1512 | |
| 1513 | local_irq_restore(flags); |
| 1514 | |
| 1515 | return 0; |
| 1516 | } |
| 1517 | |
| 1518 | EXPORT_SYMBOL(dma_set_device_handler); |