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859277f7 LC |
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> | |
29 | #include <linux/irqreturn.h> | |
30 | #include <linux/proc_fs.h> | |
31 | ||
32 | #include <mach/timer.h> | |
33 | ||
34 | #include <linux/mm.h> | |
35 | #include <linux/pfn.h> | |
36 | #include <asm/atomic.h> | |
37 | #include <mach/dma.h> | |
38 | ||
39 | /* I don't quite understand why dc4 fails when this is set to 1 and DMA is enabled */ | |
40 | /* especially since dc4 doesn't use kmalloc'd memory. */ | |
41 | ||
42 | #define ALLOW_MAP_OF_KMALLOC_MEMORY 0 | |
43 | ||
44 | /* ---- Public Variables ------------------------------------------------- */ | |
45 | ||
46 | /* ---- Private Constants and Types -------------------------------------- */ | |
47 | ||
48 | #define MAKE_HANDLE(controllerIdx, channelIdx) (((controllerIdx) << 4) | (channelIdx)) | |
49 | ||
50 | #define CONTROLLER_FROM_HANDLE(handle) (((handle) >> 4) & 0x0f) | |
51 | #define CHANNEL_FROM_HANDLE(handle) ((handle) & 0x0f) | |
52 | ||
53 | #define DMA_MAP_DEBUG 0 | |
54 | ||
55 | #if DMA_MAP_DEBUG | |
56 | # define DMA_MAP_PRINT(fmt, args...) printk("%s: " fmt, __func__, ## args) | |
57 | #else | |
58 | # define DMA_MAP_PRINT(fmt, args...) | |
59 | #endif | |
60 | ||
61 | /* ---- Private Variables ------------------------------------------------ */ | |
62 | ||
63 | static DMA_Global_t gDMA; | |
64 | static struct proc_dir_entry *gDmaDir; | |
65 | ||
66 | static atomic_t gDmaStatMemTypeKmalloc = ATOMIC_INIT(0); | |
67 | static atomic_t gDmaStatMemTypeVmalloc = ATOMIC_INIT(0); | |
68 | static atomic_t gDmaStatMemTypeUser = ATOMIC_INIT(0); | |
69 | static atomic_t gDmaStatMemTypeCoherent = ATOMIC_INIT(0); | |
70 | ||
71 | #include "dma_device.c" | |
72 | ||
73 | /* ---- Private Function Prototypes -------------------------------------- */ | |
74 | ||
75 | /* ---- Functions ------------------------------------------------------- */ | |
76 | ||
77 | /****************************************************************************/ | |
78 | /** | |
79 | * Displays information for /proc/dma/mem-type | |
80 | */ | |
81 | /****************************************************************************/ | |
82 | ||
83 | static int dma_proc_read_mem_type(char *buf, char **start, off_t offset, | |
84 | int count, int *eof, void *data) | |
85 | { | |
86 | int len = 0; | |
87 | ||
88 | len += sprintf(buf + len, "dma_map_mem statistics\n"); | |
89 | len += | |
90 | sprintf(buf + len, "coherent: %d\n", | |
91 | atomic_read(&gDmaStatMemTypeCoherent)); | |
92 | len += | |
93 | sprintf(buf + len, "kmalloc: %d\n", | |
94 | atomic_read(&gDmaStatMemTypeKmalloc)); | |
95 | len += | |
96 | sprintf(buf + len, "vmalloc: %d\n", | |
97 | atomic_read(&gDmaStatMemTypeVmalloc)); | |
98 | len += | |
99 | sprintf(buf + len, "user: %d\n", | |
100 | atomic_read(&gDmaStatMemTypeUser)); | |
101 | ||
102 | return len; | |
103 | } | |
104 | ||
105 | /****************************************************************************/ | |
106 | /** | |
107 | * Displays information for /proc/dma/channels | |
108 | */ | |
109 | /****************************************************************************/ | |
110 | ||
111 | static int dma_proc_read_channels(char *buf, char **start, off_t offset, | |
112 | int count, int *eof, void *data) | |
113 | { | |
114 | int controllerIdx; | |
115 | int channelIdx; | |
116 | int limit = count - 200; | |
117 | int len = 0; | |
118 | DMA_Channel_t *channel; | |
119 | ||
120 | if (down_interruptible(&gDMA.lock) < 0) { | |
121 | return -ERESTARTSYS; | |
122 | } | |
123 | ||
124 | for (controllerIdx = 0; controllerIdx < DMA_NUM_CONTROLLERS; | |
125 | controllerIdx++) { | |
126 | for (channelIdx = 0; channelIdx < DMA_NUM_CHANNELS; | |
127 | channelIdx++) { | |
128 | if (len >= limit) { | |
129 | break; | |
130 | } | |
131 | ||
132 | channel = | |
133 | &gDMA.controller[controllerIdx].channel[channelIdx]; | |
134 | ||
135 | len += | |
136 | sprintf(buf + len, "%d:%d ", controllerIdx, | |
137 | channelIdx); | |
138 | ||
139 | if ((channel->flags & DMA_CHANNEL_FLAG_IS_DEDICATED) != | |
140 | 0) { | |
141 | len += | |
142 | sprintf(buf + len, "Dedicated for %s ", | |
143 | DMA_gDeviceAttribute[channel-> | |
144 | devType].name); | |
145 | } else { | |
146 | len += sprintf(buf + len, "Shared "); | |
147 | } | |
148 | ||
149 | if ((channel->flags & DMA_CHANNEL_FLAG_NO_ISR) != 0) { | |
150 | len += sprintf(buf + len, "No ISR "); | |
151 | } | |
152 | ||
153 | if ((channel->flags & DMA_CHANNEL_FLAG_LARGE_FIFO) != 0) { | |
154 | len += sprintf(buf + len, "Fifo: 128 "); | |
155 | } else { | |
156 | len += sprintf(buf + len, "Fifo: 64 "); | |
157 | } | |
158 | ||
159 | if ((channel->flags & DMA_CHANNEL_FLAG_IN_USE) != 0) { | |
160 | len += | |
161 | sprintf(buf + len, "InUse by %s", | |
162 | DMA_gDeviceAttribute[channel-> | |
163 | devType].name); | |
164 | #if (DMA_DEBUG_TRACK_RESERVATION) | |
165 | len += | |
166 | sprintf(buf + len, " (%s:%d)", | |
167 | channel->fileName, | |
168 | channel->lineNum); | |
169 | #endif | |
170 | } else { | |
171 | len += sprintf(buf + len, "Avail "); | |
172 | } | |
173 | ||
174 | if (channel->lastDevType != DMA_DEVICE_NONE) { | |
175 | len += | |
176 | sprintf(buf + len, "Last use: %s ", | |
177 | DMA_gDeviceAttribute[channel-> | |
178 | lastDevType]. | |
179 | name); | |
180 | } | |
181 | ||
182 | len += sprintf(buf + len, "\n"); | |
183 | } | |
184 | } | |
185 | up(&gDMA.lock); | |
186 | *eof = 1; | |
187 | ||
188 | return len; | |
189 | } | |
190 | ||
191 | /****************************************************************************/ | |
192 | /** | |
193 | * Displays information for /proc/dma/devices | |
194 | */ | |
195 | /****************************************************************************/ | |
196 | ||
197 | static int dma_proc_read_devices(char *buf, char **start, off_t offset, | |
198 | int count, int *eof, void *data) | |
199 | { | |
200 | int limit = count - 200; | |
201 | int len = 0; | |
202 | int devIdx; | |
203 | ||
204 | if (down_interruptible(&gDMA.lock) < 0) { | |
205 | return -ERESTARTSYS; | |
206 | } | |
207 | ||
208 | for (devIdx = 0; devIdx < DMA_NUM_DEVICE_ENTRIES; devIdx++) { | |
209 | DMA_DeviceAttribute_t *devAttr = &DMA_gDeviceAttribute[devIdx]; | |
210 | ||
211 | if (devAttr->name == NULL) { | |
212 | continue; | |
213 | } | |
214 | ||
215 | if (len >= limit) { | |
216 | break; | |
217 | } | |
218 | ||
219 | len += sprintf(buf + len, "%-12s ", devAttr->name); | |
220 | ||
221 | if ((devAttr->flags & DMA_DEVICE_FLAG_IS_DEDICATED) != 0) { | |
222 | len += | |
223 | sprintf(buf + len, "Dedicated %d:%d ", | |
224 | devAttr->dedicatedController, | |
225 | devAttr->dedicatedChannel); | |
226 | } else { | |
227 | len += sprintf(buf + len, "Shared DMA:"); | |
228 | if ((devAttr->flags & DMA_DEVICE_FLAG_ON_DMA0) != 0) { | |
229 | len += sprintf(buf + len, "0"); | |
230 | } | |
231 | if ((devAttr->flags & DMA_DEVICE_FLAG_ON_DMA1) != 0) { | |
232 | len += sprintf(buf + len, "1"); | |
233 | } | |
234 | len += sprintf(buf + len, " "); | |
235 | } | |
236 | if ((devAttr->flags & DMA_DEVICE_FLAG_NO_ISR) != 0) { | |
237 | len += sprintf(buf + len, "NoISR "); | |
238 | } | |
239 | if ((devAttr->flags & DMA_DEVICE_FLAG_ALLOW_LARGE_FIFO) != 0) { | |
240 | len += sprintf(buf + len, "Allow-128 "); | |
241 | } | |
242 | ||
243 | len += | |
244 | sprintf(buf + len, | |
245 | "Xfer #: %Lu Ticks: %Lu Bytes: %Lu DescLen: %u\n", | |
246 | devAttr->numTransfers, devAttr->transferTicks, | |
247 | devAttr->transferBytes, | |
248 | devAttr->ring.bytesAllocated); | |
249 | ||
250 | } | |
251 | ||
252 | up(&gDMA.lock); | |
253 | *eof = 1; | |
254 | ||
255 | return len; | |
256 | } | |
257 | ||
258 | /****************************************************************************/ | |
259 | /** | |
260 | * Determines if a DMA_Device_t is "valid". | |
261 | * | |
262 | * @return | |
263 | * TRUE - dma device is valid | |
264 | * FALSE - dma device isn't valid | |
265 | */ | |
266 | /****************************************************************************/ | |
267 | ||
268 | static inline int IsDeviceValid(DMA_Device_t device) | |
269 | { | |
270 | return (device >= 0) && (device < DMA_NUM_DEVICE_ENTRIES); | |
271 | } | |
272 | ||
273 | /****************************************************************************/ | |
274 | /** | |
275 | * Translates a DMA handle into a pointer to a channel. | |
276 | * | |
277 | * @return | |
278 | * non-NULL - pointer to DMA_Channel_t | |
279 | * NULL - DMA Handle was invalid | |
280 | */ | |
281 | /****************************************************************************/ | |
282 | ||
283 | static inline DMA_Channel_t *HandleToChannel(DMA_Handle_t handle) | |
284 | { | |
285 | int controllerIdx; | |
286 | int channelIdx; | |
287 | ||
288 | controllerIdx = CONTROLLER_FROM_HANDLE(handle); | |
289 | channelIdx = CHANNEL_FROM_HANDLE(handle); | |
290 | ||
291 | if ((controllerIdx > DMA_NUM_CONTROLLERS) | |
292 | || (channelIdx > DMA_NUM_CHANNELS)) { | |
293 | return NULL; | |
294 | } | |
295 | return &gDMA.controller[controllerIdx].channel[channelIdx]; | |
296 | } | |
297 | ||
298 | /****************************************************************************/ | |
299 | /** | |
300 | * Interrupt handler which is called to process DMA interrupts. | |
301 | */ | |
302 | /****************************************************************************/ | |
303 | ||
304 | static irqreturn_t dma_interrupt_handler(int irq, void *dev_id) | |
305 | { | |
306 | DMA_Channel_t *channel; | |
307 | DMA_DeviceAttribute_t *devAttr; | |
308 | int irqStatus; | |
309 | ||
310 | channel = (DMA_Channel_t *) dev_id; | |
311 | ||
312 | /* Figure out why we were called, and knock down the interrupt */ | |
313 | ||
314 | irqStatus = dmacHw_getInterruptStatus(channel->dmacHwHandle); | |
315 | dmacHw_clearInterrupt(channel->dmacHwHandle); | |
316 | ||
317 | if ((channel->devType < 0) | |
318 | || (channel->devType > DMA_NUM_DEVICE_ENTRIES)) { | |
319 | printk(KERN_ERR "dma_interrupt_handler: Invalid devType: %d\n", | |
320 | channel->devType); | |
321 | return IRQ_NONE; | |
322 | } | |
323 | devAttr = &DMA_gDeviceAttribute[channel->devType]; | |
324 | ||
325 | /* Update stats */ | |
326 | ||
327 | if ((irqStatus & dmacHw_INTERRUPT_STATUS_TRANS) != 0) { | |
328 | devAttr->transferTicks += | |
329 | (timer_get_tick_count() - devAttr->transferStartTime); | |
330 | } | |
331 | ||
332 | if ((irqStatus & dmacHw_INTERRUPT_STATUS_ERROR) != 0) { | |
333 | printk(KERN_ERR | |
334 | "dma_interrupt_handler: devType :%d DMA error (%s)\n", | |
335 | channel->devType, devAttr->name); | |
336 | } else { | |
337 | devAttr->numTransfers++; | |
338 | devAttr->transferBytes += devAttr->numBytes; | |
339 | } | |
340 | ||
341 | /* Call any installed handler */ | |
342 | ||
343 | if (devAttr->devHandler != NULL) { | |
344 | devAttr->devHandler(channel->devType, irqStatus, | |
345 | devAttr->userData); | |
346 | } | |
347 | ||
348 | return IRQ_HANDLED; | |
349 | } | |
350 | ||
351 | /****************************************************************************/ | |
352 | /** | |
353 | * Allocates memory to hold a descriptor ring. The descriptor ring then | |
354 | * needs to be populated by making one or more calls to | |
355 | * dna_add_descriptors. | |
356 | * | |
357 | * The returned descriptor ring will be automatically initialized. | |
358 | * | |
359 | * @return | |
360 | * 0 Descriptor ring was allocated successfully | |
361 | * -EINVAL Invalid parameters passed in | |
362 | * -ENOMEM Unable to allocate memory for the desired number of descriptors. | |
363 | */ | |
364 | /****************************************************************************/ | |
365 | ||
366 | int dma_alloc_descriptor_ring(DMA_DescriptorRing_t *ring, /* Descriptor ring to populate */ | |
367 | int numDescriptors /* Number of descriptors that need to be allocated. */ | |
368 | ) { | |
369 | size_t bytesToAlloc = dmacHw_descriptorLen(numDescriptors); | |
370 | ||
371 | if ((ring == NULL) || (numDescriptors <= 0)) { | |
372 | return -EINVAL; | |
373 | } | |
374 | ||
375 | ring->physAddr = 0; | |
376 | ring->descriptorsAllocated = 0; | |
377 | ring->bytesAllocated = 0; | |
378 | ||
379 | ring->virtAddr = dma_alloc_writecombine(NULL, | |
380 | bytesToAlloc, | |
381 | &ring->physAddr, | |
382 | GFP_KERNEL); | |
383 | if (ring->virtAddr == NULL) { | |
384 | return -ENOMEM; | |
385 | } | |
386 | ||
387 | ring->bytesAllocated = bytesToAlloc; | |
388 | ring->descriptorsAllocated = numDescriptors; | |
389 | ||
390 | return dma_init_descriptor_ring(ring, numDescriptors); | |
391 | } | |
392 | ||
393 | EXPORT_SYMBOL(dma_alloc_descriptor_ring); | |
394 | ||
395 | /****************************************************************************/ | |
396 | /** | |
397 | * Releases the memory which was previously allocated for a descriptor ring. | |
398 | */ | |
399 | /****************************************************************************/ | |
400 | ||
401 | void dma_free_descriptor_ring(DMA_DescriptorRing_t *ring /* Descriptor to release */ | |
402 | ) { | |
403 | if (ring->virtAddr != NULL) { | |
404 | dma_free_writecombine(NULL, | |
405 | ring->bytesAllocated, | |
406 | ring->virtAddr, ring->physAddr); | |
407 | } | |
408 | ||
409 | ring->bytesAllocated = 0; | |
410 | ring->descriptorsAllocated = 0; | |
411 | ring->virtAddr = NULL; | |
412 | ring->physAddr = 0; | |
413 | } | |
414 | ||
415 | EXPORT_SYMBOL(dma_free_descriptor_ring); | |
416 | ||
417 | /****************************************************************************/ | |
418 | /** | |
419 | * Initializes a descriptor ring, so that descriptors can be added to it. | |
420 | * Once a descriptor ring has been allocated, it may be reinitialized for | |
421 | * use with additional/different regions of memory. | |
422 | * | |
423 | * Note that if 7 descriptors are allocated, it's perfectly acceptable to | |
424 | * initialize the ring with a smaller number of descriptors. The amount | |
425 | * of memory allocated for the descriptor ring will not be reduced, and | |
426 | * the descriptor ring may be reinitialized later | |
427 | * | |
428 | * @return | |
429 | * 0 Descriptor ring was initialized successfully | |
430 | * -ENOMEM The descriptor which was passed in has insufficient space | |
431 | * to hold the desired number of descriptors. | |
432 | */ | |
433 | /****************************************************************************/ | |
434 | ||
435 | int dma_init_descriptor_ring(DMA_DescriptorRing_t *ring, /* Descriptor ring to initialize */ | |
436 | int numDescriptors /* Number of descriptors to initialize. */ | |
437 | ) { | |
438 | if (ring->virtAddr == NULL) { | |
439 | return -EINVAL; | |
440 | } | |
441 | if (dmacHw_initDescriptor(ring->virtAddr, | |
442 | ring->physAddr, | |
443 | ring->bytesAllocated, numDescriptors) < 0) { | |
444 | printk(KERN_ERR | |
445 | "dma_init_descriptor_ring: dmacHw_initDescriptor failed\n"); | |
446 | return -ENOMEM; | |
447 | } | |
448 | ||
449 | return 0; | |
450 | } | |
451 | ||
452 | EXPORT_SYMBOL(dma_init_descriptor_ring); | |
453 | ||
454 | /****************************************************************************/ | |
455 | /** | |
456 | * Determines the number of descriptors which would be required for a | |
457 | * transfer of the indicated memory region. | |
458 | * | |
459 | * This function also needs to know which DMA device this transfer will | |
460 | * be destined for, so that the appropriate DMA configuration can be retrieved. | |
461 | * DMA parameters such as transfer width, and whether this is a memory-to-memory | |
462 | * or memory-to-peripheral, etc can all affect the actual number of descriptors | |
463 | * required. | |
464 | * | |
465 | * @return | |
466 | * > 0 Returns the number of descriptors required for the indicated transfer | |
467 | * -ENODEV - Device handed in is invalid. | |
468 | * -EINVAL Invalid parameters | |
469 | * -ENOMEM Memory exhausted | |
470 | */ | |
471 | /****************************************************************************/ | |
472 | ||
473 | int dma_calculate_descriptor_count(DMA_Device_t device, /* DMA Device that this will be associated with */ | |
474 | dma_addr_t srcData, /* Place to get data to write to device */ | |
475 | dma_addr_t dstData, /* Pointer to device data address */ | |
476 | size_t numBytes /* Number of bytes to transfer to the device */ | |
477 | ) { | |
478 | int numDescriptors; | |
479 | DMA_DeviceAttribute_t *devAttr; | |
480 | ||
481 | if (!IsDeviceValid(device)) { | |
482 | return -ENODEV; | |
483 | } | |
484 | devAttr = &DMA_gDeviceAttribute[device]; | |
485 | ||
486 | numDescriptors = dmacHw_calculateDescriptorCount(&devAttr->config, | |
487 | (void *)srcData, | |
488 | (void *)dstData, | |
489 | numBytes); | |
490 | if (numDescriptors < 0) { | |
491 | printk(KERN_ERR | |
492 | "dma_calculate_descriptor_count: dmacHw_calculateDescriptorCount failed\n"); | |
493 | return -EINVAL; | |
494 | } | |
495 | ||
496 | return numDescriptors; | |
497 | } | |
498 | ||
499 | EXPORT_SYMBOL(dma_calculate_descriptor_count); | |
500 | ||
501 | /****************************************************************************/ | |
502 | /** | |
503 | * Adds a region of memory to the descriptor ring. Note that it may take | |
504 | * multiple descriptors for each region of memory. It is the callers | |
505 | * responsibility to allocate a sufficiently large descriptor ring. | |
506 | * | |
507 | * @return | |
508 | * 0 Descriptors were added successfully | |
509 | * -ENODEV Device handed in is invalid. | |
510 | * -EINVAL Invalid parameters | |
511 | * -ENOMEM Memory exhausted | |
512 | */ | |
513 | /****************************************************************************/ | |
514 | ||
515 | int dma_add_descriptors(DMA_DescriptorRing_t *ring, /* Descriptor ring to add descriptors to */ | |
516 | DMA_Device_t device, /* DMA Device that descriptors are for */ | |
517 | dma_addr_t srcData, /* Place to get data (memory or device) */ | |
518 | dma_addr_t dstData, /* Place to put data (memory or device) */ | |
519 | size_t numBytes /* Number of bytes to transfer to the device */ | |
520 | ) { | |
521 | int rc; | |
522 | DMA_DeviceAttribute_t *devAttr; | |
523 | ||
524 | if (!IsDeviceValid(device)) { | |
525 | return -ENODEV; | |
526 | } | |
527 | devAttr = &DMA_gDeviceAttribute[device]; | |
528 | ||
529 | rc = dmacHw_setDataDescriptor(&devAttr->config, | |
530 | ring->virtAddr, | |
531 | (void *)srcData, | |
532 | (void *)dstData, numBytes); | |
533 | if (rc < 0) { | |
534 | printk(KERN_ERR | |
535 | "dma_add_descriptors: dmacHw_setDataDescriptor failed with code: %d\n", | |
536 | rc); | |
537 | return -ENOMEM; | |
538 | } | |
539 | ||
540 | return 0; | |
541 | } | |
542 | ||
543 | EXPORT_SYMBOL(dma_add_descriptors); | |
544 | ||
545 | /****************************************************************************/ | |
546 | /** | |
547 | * Sets the descriptor ring associated with a device. | |
548 | * | |
549 | * Once set, the descriptor ring will be associated with the device, even | |
550 | * across channel request/free calls. Passing in a NULL descriptor ring | |
551 | * will release any descriptor ring currently associated with the device. | |
552 | * | |
553 | * Note: If you call dma_transfer, or one of the other dma_alloc_ functions | |
554 | * the descriptor ring may be released and reallocated. | |
555 | * | |
556 | * Note: This function will release the descriptor memory for any current | |
557 | * descriptor ring associated with this device. | |
558 | * | |
559 | * @return | |
560 | * 0 Descriptors were added successfully | |
561 | * -ENODEV Device handed in is invalid. | |
562 | */ | |
563 | /****************************************************************************/ | |
564 | ||
565 | int dma_set_device_descriptor_ring(DMA_Device_t device, /* Device to update the descriptor ring for. */ | |
566 | DMA_DescriptorRing_t *ring /* Descriptor ring to add descriptors to */ | |
567 | ) { | |
568 | DMA_DeviceAttribute_t *devAttr; | |
569 | ||
570 | if (!IsDeviceValid(device)) { | |
571 | return -ENODEV; | |
572 | } | |
573 | devAttr = &DMA_gDeviceAttribute[device]; | |
574 | ||
575 | /* Free the previously allocated descriptor ring */ | |
576 | ||
577 | dma_free_descriptor_ring(&devAttr->ring); | |
578 | ||
579 | if (ring != NULL) { | |
580 | /* Copy in the new one */ | |
581 | ||
582 | devAttr->ring = *ring; | |
583 | } | |
584 | ||
585 | /* Set things up so that if dma_transfer is called then this descriptor */ | |
586 | /* ring will get freed. */ | |
587 | ||
588 | devAttr->prevSrcData = 0; | |
589 | devAttr->prevDstData = 0; | |
590 | devAttr->prevNumBytes = 0; | |
591 | ||
592 | return 0; | |
593 | } | |
594 | ||
595 | EXPORT_SYMBOL(dma_set_device_descriptor_ring); | |
596 | ||
597 | /****************************************************************************/ | |
598 | /** | |
599 | * Retrieves the descriptor ring associated with a device. | |
600 | * | |
601 | * @return | |
602 | * 0 Descriptors were added successfully | |
603 | * -ENODEV Device handed in is invalid. | |
604 | */ | |
605 | /****************************************************************************/ | |
606 | ||
607 | int dma_get_device_descriptor_ring(DMA_Device_t device, /* Device to retrieve the descriptor ring for. */ | |
608 | DMA_DescriptorRing_t *ring /* Place to store retrieved ring */ | |
609 | ) { | |
610 | DMA_DeviceAttribute_t *devAttr; | |
611 | ||
612 | memset(ring, 0, sizeof(*ring)); | |
613 | ||
614 | if (!IsDeviceValid(device)) { | |
615 | return -ENODEV; | |
616 | } | |
617 | devAttr = &DMA_gDeviceAttribute[device]; | |
618 | ||
619 | *ring = devAttr->ring; | |
620 | ||
621 | return 0; | |
622 | } | |
623 | ||
624 | EXPORT_SYMBOL(dma_get_device_descriptor_ring); | |
625 | ||
626 | /****************************************************************************/ | |
627 | /** | |
628 | * Configures a DMA channel. | |
629 | * | |
630 | * @return | |
631 | * >= 0 - Initialization was successfull. | |
632 | * | |
633 | * -EBUSY - Device is currently being used. | |
634 | * -ENODEV - Device handed in is invalid. | |
635 | */ | |
636 | /****************************************************************************/ | |
637 | ||
638 | static int ConfigChannel(DMA_Handle_t handle) | |
639 | { | |
640 | DMA_Channel_t *channel; | |
641 | DMA_DeviceAttribute_t *devAttr; | |
642 | int controllerIdx; | |
643 | ||
644 | channel = HandleToChannel(handle); | |
645 | if (channel == NULL) { | |
646 | return -ENODEV; | |
647 | } | |
648 | devAttr = &DMA_gDeviceAttribute[channel->devType]; | |
649 | controllerIdx = CONTROLLER_FROM_HANDLE(handle); | |
650 | ||
651 | if ((devAttr->flags & DMA_DEVICE_FLAG_PORT_PER_DMAC) != 0) { | |
652 | if (devAttr->config.transferType == | |
653 | dmacHw_TRANSFER_TYPE_MEM_TO_PERIPHERAL) { | |
654 | devAttr->config.dstPeripheralPort = | |
655 | devAttr->dmacPort[controllerIdx]; | |
656 | } else if (devAttr->config.transferType == | |
657 | dmacHw_TRANSFER_TYPE_PERIPHERAL_TO_MEM) { | |
658 | devAttr->config.srcPeripheralPort = | |
659 | devAttr->dmacPort[controllerIdx]; | |
660 | } | |
661 | } | |
662 | ||
663 | if (dmacHw_configChannel(channel->dmacHwHandle, &devAttr->config) != 0) { | |
664 | printk(KERN_ERR "ConfigChannel: dmacHw_configChannel failed\n"); | |
665 | return -EIO; | |
666 | } | |
667 | ||
668 | return 0; | |
669 | } | |
670 | ||
671 | /****************************************************************************/ | |
672 | /** | |
673 | * Intializes all of the data structures associated with the DMA. | |
674 | * @return | |
675 | * >= 0 - Initialization was successfull. | |
676 | * | |
677 | * -EBUSY - Device is currently being used. | |
678 | * -ENODEV - Device handed in is invalid. | |
679 | */ | |
680 | /****************************************************************************/ | |
681 | ||
682 | int dma_init(void) | |
683 | { | |
684 | int rc = 0; | |
685 | int controllerIdx; | |
686 | int channelIdx; | |
687 | DMA_Device_t devIdx; | |
688 | DMA_Channel_t *channel; | |
689 | DMA_Handle_t dedicatedHandle; | |
690 | ||
691 | memset(&gDMA, 0, sizeof(gDMA)); | |
692 | ||
693 | init_MUTEX_LOCKED(&gDMA.lock); | |
694 | init_waitqueue_head(&gDMA.freeChannelQ); | |
695 | ||
696 | /* Initialize the Hardware */ | |
697 | ||
698 | dmacHw_initDma(); | |
699 | ||
700 | /* Start off by marking all of the DMA channels as shared. */ | |
701 | ||
702 | for (controllerIdx = 0; controllerIdx < DMA_NUM_CONTROLLERS; | |
703 | controllerIdx++) { | |
704 | for (channelIdx = 0; channelIdx < DMA_NUM_CHANNELS; | |
705 | channelIdx++) { | |
706 | channel = | |
707 | &gDMA.controller[controllerIdx].channel[channelIdx]; | |
708 | ||
709 | channel->flags = 0; | |
710 | channel->devType = DMA_DEVICE_NONE; | |
711 | channel->lastDevType = DMA_DEVICE_NONE; | |
712 | ||
713 | #if (DMA_DEBUG_TRACK_RESERVATION) | |
714 | channel->fileName = ""; | |
715 | channel->lineNum = 0; | |
716 | #endif | |
717 | ||
718 | channel->dmacHwHandle = | |
719 | dmacHw_getChannelHandle(dmacHw_MAKE_CHANNEL_ID | |
720 | (controllerIdx, | |
721 | channelIdx)); | |
722 | dmacHw_initChannel(channel->dmacHwHandle); | |
723 | } | |
724 | } | |
725 | ||
726 | /* Record any special attributes that channels may have */ | |
727 | ||
728 | gDMA.controller[0].channel[0].flags |= DMA_CHANNEL_FLAG_LARGE_FIFO; | |
729 | gDMA.controller[0].channel[1].flags |= DMA_CHANNEL_FLAG_LARGE_FIFO; | |
730 | gDMA.controller[1].channel[0].flags |= DMA_CHANNEL_FLAG_LARGE_FIFO; | |
731 | gDMA.controller[1].channel[1].flags |= DMA_CHANNEL_FLAG_LARGE_FIFO; | |
732 | ||
733 | /* Now walk through and record the dedicated channels. */ | |
734 | ||
735 | for (devIdx = 0; devIdx < DMA_NUM_DEVICE_ENTRIES; devIdx++) { | |
736 | DMA_DeviceAttribute_t *devAttr = &DMA_gDeviceAttribute[devIdx]; | |
737 | ||
738 | if (((devAttr->flags & DMA_DEVICE_FLAG_NO_ISR) != 0) | |
739 | && ((devAttr->flags & DMA_DEVICE_FLAG_IS_DEDICATED) == 0)) { | |
740 | printk(KERN_ERR | |
741 | "DMA Device: %s Can only request NO_ISR for dedicated devices\n", | |
742 | devAttr->name); | |
743 | rc = -EINVAL; | |
744 | goto out; | |
745 | } | |
746 | ||
747 | if ((devAttr->flags & DMA_DEVICE_FLAG_IS_DEDICATED) != 0) { | |
748 | /* This is a dedicated device. Mark the channel as being reserved. */ | |
749 | ||
750 | if (devAttr->dedicatedController >= DMA_NUM_CONTROLLERS) { | |
751 | printk(KERN_ERR | |
752 | "DMA Device: %s DMA Controller %d is out of range\n", | |
753 | devAttr->name, | |
754 | devAttr->dedicatedController); | |
755 | rc = -EINVAL; | |
756 | goto out; | |
757 | } | |
758 | ||
759 | if (devAttr->dedicatedChannel >= DMA_NUM_CHANNELS) { | |
760 | printk(KERN_ERR | |
761 | "DMA Device: %s DMA Channel %d is out of range\n", | |
762 | devAttr->name, | |
763 | devAttr->dedicatedChannel); | |
764 | rc = -EINVAL; | |
765 | goto out; | |
766 | } | |
767 | ||
768 | dedicatedHandle = | |
769 | MAKE_HANDLE(devAttr->dedicatedController, | |
770 | devAttr->dedicatedChannel); | |
771 | channel = HandleToChannel(dedicatedHandle); | |
772 | ||
773 | if ((channel->flags & DMA_CHANNEL_FLAG_IS_DEDICATED) != | |
774 | 0) { | |
775 | printk | |
776 | ("DMA Device: %s attempting to use same DMA Controller:Channel (%d:%d) as %s\n", | |
777 | devAttr->name, | |
778 | devAttr->dedicatedController, | |
779 | devAttr->dedicatedChannel, | |
780 | DMA_gDeviceAttribute[channel->devType]. | |
781 | name); | |
782 | rc = -EBUSY; | |
783 | goto out; | |
784 | } | |
785 | ||
786 | channel->flags |= DMA_CHANNEL_FLAG_IS_DEDICATED; | |
787 | channel->devType = devIdx; | |
788 | ||
789 | if (devAttr->flags & DMA_DEVICE_FLAG_NO_ISR) { | |
790 | channel->flags |= DMA_CHANNEL_FLAG_NO_ISR; | |
791 | } | |
792 | ||
793 | /* For dedicated channels, we can go ahead and configure the DMA channel now */ | |
794 | /* as well. */ | |
795 | ||
796 | ConfigChannel(dedicatedHandle); | |
797 | } | |
798 | } | |
799 | ||
800 | /* Go through and register the interrupt handlers */ | |
801 | ||
802 | for (controllerIdx = 0; controllerIdx < DMA_NUM_CONTROLLERS; | |
803 | controllerIdx++) { | |
804 | for (channelIdx = 0; channelIdx < DMA_NUM_CHANNELS; | |
805 | channelIdx++) { | |
806 | channel = | |
807 | &gDMA.controller[controllerIdx].channel[channelIdx]; | |
808 | ||
809 | if ((channel->flags & DMA_CHANNEL_FLAG_NO_ISR) == 0) { | |
810 | snprintf(channel->name, sizeof(channel->name), | |
811 | "dma %d:%d %s", controllerIdx, | |
812 | channelIdx, | |
813 | channel->devType == | |
814 | DMA_DEVICE_NONE ? "" : | |
815 | DMA_gDeviceAttribute[channel->devType]. | |
816 | name); | |
817 | ||
818 | rc = | |
819 | request_irq(IRQ_DMA0C0 + | |
820 | (controllerIdx * | |
821 | DMA_NUM_CHANNELS) + | |
822 | channelIdx, | |
823 | dma_interrupt_handler, | |
824 | IRQF_DISABLED, channel->name, | |
825 | channel); | |
826 | if (rc != 0) { | |
827 | printk(KERN_ERR | |
828 | "request_irq for IRQ_DMA%dC%d failed\n", | |
829 | controllerIdx, channelIdx); | |
830 | } | |
831 | } | |
832 | } | |
833 | } | |
834 | ||
835 | /* Create /proc/dma/channels and /proc/dma/devices */ | |
836 | ||
837 | gDmaDir = create_proc_entry("dma", S_IFDIR | S_IRUGO | S_IXUGO, NULL); | |
838 | ||
839 | if (gDmaDir == NULL) { | |
840 | printk(KERN_ERR "Unable to create /proc/dma\n"); | |
841 | } else { | |
842 | create_proc_read_entry("channels", 0, gDmaDir, | |
843 | dma_proc_read_channels, NULL); | |
844 | create_proc_read_entry("devices", 0, gDmaDir, | |
845 | dma_proc_read_devices, NULL); | |
846 | create_proc_read_entry("mem-type", 0, gDmaDir, | |
847 | dma_proc_read_mem_type, NULL); | |
848 | } | |
849 | ||
850 | out: | |
851 | ||
852 | up(&gDMA.lock); | |
853 | ||
854 | return rc; | |
855 | } | |
856 | ||
857 | /****************************************************************************/ | |
858 | /** | |
859 | * Reserves a channel for use with @a dev. If the device is setup to use | |
860 | * a shared channel, then this function will block until a free channel | |
861 | * becomes available. | |
862 | * | |
863 | * @return | |
864 | * >= 0 - A valid DMA Handle. | |
865 | * -EBUSY - Device is currently being used. | |
866 | * -ENODEV - Device handed in is invalid. | |
867 | */ | |
868 | /****************************************************************************/ | |
869 | ||
870 | #if (DMA_DEBUG_TRACK_RESERVATION) | |
871 | DMA_Handle_t dma_request_channel_dbg | |
872 | (DMA_Device_t dev, const char *fileName, int lineNum) | |
873 | #else | |
874 | DMA_Handle_t dma_request_channel(DMA_Device_t dev) | |
875 | #endif | |
876 | { | |
877 | DMA_Handle_t handle; | |
878 | DMA_DeviceAttribute_t *devAttr; | |
879 | DMA_Channel_t *channel; | |
880 | int controllerIdx; | |
881 | int controllerIdx2; | |
882 | int channelIdx; | |
883 | ||
884 | if (down_interruptible(&gDMA.lock) < 0) { | |
885 | return -ERESTARTSYS; | |
886 | } | |
887 | ||
888 | if ((dev < 0) || (dev >= DMA_NUM_DEVICE_ENTRIES)) { | |
889 | handle = -ENODEV; | |
890 | goto out; | |
891 | } | |
892 | devAttr = &DMA_gDeviceAttribute[dev]; | |
893 | ||
894 | #if (DMA_DEBUG_TRACK_RESERVATION) | |
895 | { | |
896 | char *s; | |
897 | ||
898 | s = strrchr(fileName, '/'); | |
899 | if (s != NULL) { | |
900 | fileName = s + 1; | |
901 | } | |
902 | } | |
903 | #endif | |
904 | if ((devAttr->flags & DMA_DEVICE_FLAG_IN_USE) != 0) { | |
905 | /* This device has already been requested and not been freed */ | |
906 | ||
907 | printk(KERN_ERR "%s: device %s is already requested\n", | |
908 | __func__, devAttr->name); | |
909 | handle = -EBUSY; | |
910 | goto out; | |
911 | } | |
912 | ||
913 | if ((devAttr->flags & DMA_DEVICE_FLAG_IS_DEDICATED) != 0) { | |
914 | /* This device has a dedicated channel. */ | |
915 | ||
916 | channel = | |
917 | &gDMA.controller[devAttr->dedicatedController]. | |
918 | channel[devAttr->dedicatedChannel]; | |
919 | if ((channel->flags & DMA_CHANNEL_FLAG_IN_USE) != 0) { | |
920 | handle = -EBUSY; | |
921 | goto out; | |
922 | } | |
923 | ||
924 | channel->flags |= DMA_CHANNEL_FLAG_IN_USE; | |
925 | devAttr->flags |= DMA_DEVICE_FLAG_IN_USE; | |
926 | ||
927 | #if (DMA_DEBUG_TRACK_RESERVATION) | |
928 | channel->fileName = fileName; | |
929 | channel->lineNum = lineNum; | |
930 | #endif | |
931 | handle = | |
932 | MAKE_HANDLE(devAttr->dedicatedController, | |
933 | devAttr->dedicatedChannel); | |
934 | goto out; | |
935 | } | |
936 | ||
937 | /* This device needs to use one of the shared channels. */ | |
938 | ||
939 | handle = DMA_INVALID_HANDLE; | |
940 | while (handle == DMA_INVALID_HANDLE) { | |
941 | /* Scan through the shared channels and see if one is available */ | |
942 | ||
943 | for (controllerIdx2 = 0; controllerIdx2 < DMA_NUM_CONTROLLERS; | |
944 | controllerIdx2++) { | |
945 | /* Check to see if we should try on controller 1 first. */ | |
946 | ||
947 | controllerIdx = controllerIdx2; | |
948 | if ((devAttr-> | |
949 | flags & DMA_DEVICE_FLAG_ALLOC_DMA1_FIRST) != 0) { | |
950 | controllerIdx = 1 - controllerIdx; | |
951 | } | |
952 | ||
953 | /* See if the device is available on the controller being tested */ | |
954 | ||
955 | if ((devAttr-> | |
956 | flags & (DMA_DEVICE_FLAG_ON_DMA0 << controllerIdx)) | |
957 | != 0) { | |
958 | for (channelIdx = 0; | |
959 | channelIdx < DMA_NUM_CHANNELS; | |
960 | channelIdx++) { | |
961 | channel = | |
962 | &gDMA.controller[controllerIdx]. | |
963 | channel[channelIdx]; | |
964 | ||
965 | if (((channel-> | |
966 | flags & | |
967 | DMA_CHANNEL_FLAG_IS_DEDICATED) == | |
968 | 0) | |
969 | && | |
970 | ((channel-> | |
971 | flags & DMA_CHANNEL_FLAG_IN_USE) | |
972 | == 0)) { | |
973 | if (((channel-> | |
974 | flags & | |
975 | DMA_CHANNEL_FLAG_LARGE_FIFO) | |
976 | != 0) | |
977 | && | |
978 | ((devAttr-> | |
979 | flags & | |
980 | DMA_DEVICE_FLAG_ALLOW_LARGE_FIFO) | |
981 | == 0)) { | |
982 | /* This channel is a large fifo - don't tie it up */ | |
983 | /* with devices that we don't want using it. */ | |
984 | ||
985 | continue; | |
986 | } | |
987 | ||
988 | channel->flags |= | |
989 | DMA_CHANNEL_FLAG_IN_USE; | |
990 | channel->devType = dev; | |
991 | devAttr->flags |= | |
992 | DMA_DEVICE_FLAG_IN_USE; | |
993 | ||
994 | #if (DMA_DEBUG_TRACK_RESERVATION) | |
995 | channel->fileName = fileName; | |
996 | channel->lineNum = lineNum; | |
997 | #endif | |
998 | handle = | |
999 | MAKE_HANDLE(controllerIdx, | |
1000 | channelIdx); | |
1001 | ||
1002 | /* Now that we've reserved the channel - we can go ahead and configure it */ | |
1003 | ||
1004 | if (ConfigChannel(handle) != 0) { | |
1005 | handle = -EIO; | |
1006 | printk(KERN_ERR | |
1007 | "dma_request_channel: ConfigChannel failed\n"); | |
1008 | } | |
1009 | goto out; | |
1010 | } | |
1011 | } | |
1012 | } | |
1013 | } | |
1014 | ||
1015 | /* No channels are currently available. Let's wait for one to free up. */ | |
1016 | ||
1017 | { | |
1018 | DEFINE_WAIT(wait); | |
1019 | ||
1020 | prepare_to_wait(&gDMA.freeChannelQ, &wait, | |
1021 | TASK_INTERRUPTIBLE); | |
1022 | up(&gDMA.lock); | |
1023 | schedule(); | |
1024 | finish_wait(&gDMA.freeChannelQ, &wait); | |
1025 | ||
1026 | if (signal_pending(current)) { | |
1027 | /* We don't currently hold gDMA.lock, so we return directly */ | |
1028 | ||
1029 | return -ERESTARTSYS; | |
1030 | } | |
1031 | } | |
1032 | ||
1033 | if (down_interruptible(&gDMA.lock)) { | |
1034 | return -ERESTARTSYS; | |
1035 | } | |
1036 | } | |
1037 | ||
1038 | out: | |
1039 | up(&gDMA.lock); | |
1040 | ||
1041 | return handle; | |
1042 | } | |
1043 | ||
1044 | /* Create both _dbg and non _dbg functions for modules. */ | |
1045 | ||
1046 | #if (DMA_DEBUG_TRACK_RESERVATION) | |
1047 | #undef dma_request_channel | |
1048 | DMA_Handle_t dma_request_channel(DMA_Device_t dev) | |
1049 | { | |
1050 | return dma_request_channel_dbg(dev, __FILE__, __LINE__); | |
1051 | } | |
1052 | ||
1053 | EXPORT_SYMBOL(dma_request_channel_dbg); | |
1054 | #endif | |
1055 | EXPORT_SYMBOL(dma_request_channel); | |
1056 | ||
1057 | /****************************************************************************/ | |
1058 | /** | |
1059 | * Frees a previously allocated DMA Handle. | |
1060 | */ | |
1061 | /****************************************************************************/ | |
1062 | ||
1063 | int dma_free_channel(DMA_Handle_t handle /* DMA handle. */ | |
1064 | ) { | |
1065 | int rc = 0; | |
1066 | DMA_Channel_t *channel; | |
1067 | DMA_DeviceAttribute_t *devAttr; | |
1068 | ||
1069 | if (down_interruptible(&gDMA.lock) < 0) { | |
1070 | return -ERESTARTSYS; | |
1071 | } | |
1072 | ||
1073 | channel = HandleToChannel(handle); | |
1074 | if (channel == NULL) { | |
1075 | rc = -EINVAL; | |
1076 | goto out; | |
1077 | } | |
1078 | ||
1079 | devAttr = &DMA_gDeviceAttribute[channel->devType]; | |
1080 | ||
1081 | if ((channel->flags & DMA_CHANNEL_FLAG_IS_DEDICATED) == 0) { | |
1082 | channel->lastDevType = channel->devType; | |
1083 | channel->devType = DMA_DEVICE_NONE; | |
1084 | } | |
1085 | channel->flags &= ~DMA_CHANNEL_FLAG_IN_USE; | |
1086 | devAttr->flags &= ~DMA_DEVICE_FLAG_IN_USE; | |
1087 | ||
1088 | out: | |
1089 | up(&gDMA.lock); | |
1090 | ||
1091 | wake_up_interruptible(&gDMA.freeChannelQ); | |
1092 | ||
1093 | return rc; | |
1094 | } | |
1095 | ||
1096 | EXPORT_SYMBOL(dma_free_channel); | |
1097 | ||
1098 | /****************************************************************************/ | |
1099 | /** | |
1100 | * Determines if a given device has been configured as using a shared | |
1101 | * channel. | |
1102 | * | |
1103 | * @return | |
1104 | * 0 Device uses a dedicated channel | |
1105 | * > zero Device uses a shared channel | |
1106 | * < zero Error code | |
1107 | */ | |
1108 | /****************************************************************************/ | |
1109 | ||
1110 | int dma_device_is_channel_shared(DMA_Device_t device /* Device to check. */ | |
1111 | ) { | |
1112 | DMA_DeviceAttribute_t *devAttr; | |
1113 | ||
1114 | if (!IsDeviceValid(device)) { | |
1115 | return -ENODEV; | |
1116 | } | |
1117 | devAttr = &DMA_gDeviceAttribute[device]; | |
1118 | ||
1119 | return ((devAttr->flags & DMA_DEVICE_FLAG_IS_DEDICATED) == 0); | |
1120 | } | |
1121 | ||
1122 | EXPORT_SYMBOL(dma_device_is_channel_shared); | |
1123 | ||
1124 | /****************************************************************************/ | |
1125 | /** | |
1126 | * Allocates buffers for the descriptors. This is normally done automatically | |
1127 | * but needs to be done explicitly when initiating a dma from interrupt | |
1128 | * context. | |
1129 | * | |
1130 | * @return | |
1131 | * 0 Descriptors were allocated successfully | |
1132 | * -EINVAL Invalid device type for this kind of transfer | |
1133 | * (i.e. the device is _MEM_TO_DEV and not _DEV_TO_MEM) | |
1134 | * -ENOMEM Memory exhausted | |
1135 | */ | |
1136 | /****************************************************************************/ | |
1137 | ||
1138 | int dma_alloc_descriptors(DMA_Handle_t handle, /* DMA Handle */ | |
1139 | dmacHw_TRANSFER_TYPE_e transferType, /* Type of transfer being performed */ | |
1140 | dma_addr_t srcData, /* Place to get data to write to device */ | |
1141 | dma_addr_t dstData, /* Pointer to device data address */ | |
1142 | size_t numBytes /* Number of bytes to transfer to the device */ | |
1143 | ) { | |
1144 | DMA_Channel_t *channel; | |
1145 | DMA_DeviceAttribute_t *devAttr; | |
1146 | int numDescriptors; | |
1147 | size_t ringBytesRequired; | |
1148 | int rc = 0; | |
1149 | ||
1150 | channel = HandleToChannel(handle); | |
1151 | if (channel == NULL) { | |
1152 | return -ENODEV; | |
1153 | } | |
1154 | ||
1155 | devAttr = &DMA_gDeviceAttribute[channel->devType]; | |
1156 | ||
1157 | if (devAttr->config.transferType != transferType) { | |
1158 | return -EINVAL; | |
1159 | } | |
1160 | ||
1161 | /* Figure out how many descriptors we need. */ | |
1162 | ||
1163 | /* printk("srcData: 0x%08x dstData: 0x%08x, numBytes: %d\n", */ | |
1164 | /* srcData, dstData, numBytes); */ | |
1165 | ||
1166 | numDescriptors = dmacHw_calculateDescriptorCount(&devAttr->config, | |
1167 | (void *)srcData, | |
1168 | (void *)dstData, | |
1169 | numBytes); | |
1170 | if (numDescriptors < 0) { | |
1171 | printk(KERN_ERR "%s: dmacHw_calculateDescriptorCount failed\n", | |
1172 | __func__); | |
1173 | return -EINVAL; | |
1174 | } | |
1175 | ||
1176 | /* Check to see if we can reuse the existing descriptor ring, or if we need to allocate */ | |
1177 | /* a new one. */ | |
1178 | ||
1179 | ringBytesRequired = dmacHw_descriptorLen(numDescriptors); | |
1180 | ||
1181 | /* printk("ringBytesRequired: %d\n", ringBytesRequired); */ | |
1182 | ||
1183 | if (ringBytesRequired > devAttr->ring.bytesAllocated) { | |
1184 | /* Make sure that this code path is never taken from interrupt context. */ | |
1185 | /* It's OK for an interrupt to initiate a DMA transfer, but the descriptor */ | |
1186 | /* allocation needs to have already been done. */ | |
1187 | ||
1188 | might_sleep(); | |
1189 | ||
1190 | /* Free the old descriptor ring and allocate a new one. */ | |
1191 | ||
1192 | dma_free_descriptor_ring(&devAttr->ring); | |
1193 | ||
1194 | /* And allocate a new one. */ | |
1195 | ||
1196 | rc = | |
1197 | dma_alloc_descriptor_ring(&devAttr->ring, | |
1198 | numDescriptors); | |
1199 | if (rc < 0) { | |
1200 | printk(KERN_ERR | |
1201 | "%s: dma_alloc_descriptor_ring(%d) failed\n", | |
1202 | __func__, numDescriptors); | |
1203 | return rc; | |
1204 | } | |
1205 | /* Setup the descriptor for this transfer */ | |
1206 | ||
1207 | if (dmacHw_initDescriptor(devAttr->ring.virtAddr, | |
1208 | devAttr->ring.physAddr, | |
1209 | devAttr->ring.bytesAllocated, | |
1210 | numDescriptors) < 0) { | |
1211 | printk(KERN_ERR "%s: dmacHw_initDescriptor failed\n", | |
1212 | __func__); | |
1213 | return -EINVAL; | |
1214 | } | |
1215 | } else { | |
1216 | /* We've already got enough ring buffer allocated. All we need to do is reset */ | |
1217 | /* any control information, just in case the previous DMA was stopped. */ | |
1218 | ||
1219 | dmacHw_resetDescriptorControl(devAttr->ring.virtAddr); | |
1220 | } | |
1221 | ||
1222 | /* dma_alloc/free both set the prevSrc/DstData to 0. If they happen to be the same */ | |
1223 | /* as last time, then we don't need to call setDataDescriptor again. */ | |
1224 | ||
1225 | if (dmacHw_setDataDescriptor(&devAttr->config, | |
1226 | devAttr->ring.virtAddr, | |
1227 | (void *)srcData, | |
1228 | (void *)dstData, numBytes) < 0) { | |
1229 | printk(KERN_ERR "%s: dmacHw_setDataDescriptor failed\n", | |
1230 | __func__); | |
1231 | return -EINVAL; | |
1232 | } | |
1233 | ||
1234 | /* Remember the critical information for this transfer so that we can eliminate */ | |
1235 | /* another call to dma_alloc_descriptors if the caller reuses the same buffers */ | |
1236 | ||
1237 | devAttr->prevSrcData = srcData; | |
1238 | devAttr->prevDstData = dstData; | |
1239 | devAttr->prevNumBytes = numBytes; | |
1240 | ||
1241 | return 0; | |
1242 | } | |
1243 | ||
1244 | EXPORT_SYMBOL(dma_alloc_descriptors); | |
1245 | ||
1246 | /****************************************************************************/ | |
1247 | /** | |
1248 | * Allocates and sets up descriptors for a double buffered circular buffer. | |
1249 | * | |
1250 | * This is primarily intended to be used for things like the ingress samples | |
1251 | * from a microphone. | |
1252 | * | |
1253 | * @return | |
1254 | * > 0 Number of descriptors actually allocated. | |
1255 | * -EINVAL Invalid device type for this kind of transfer | |
1256 | * (i.e. the device is _MEM_TO_DEV and not _DEV_TO_MEM) | |
1257 | * -ENOMEM Memory exhausted | |
1258 | */ | |
1259 | /****************************************************************************/ | |
1260 | ||
1261 | int dma_alloc_double_dst_descriptors(DMA_Handle_t handle, /* DMA Handle */ | |
1262 | dma_addr_t srcData, /* Physical address of source data */ | |
1263 | dma_addr_t dstData1, /* Physical address of first destination buffer */ | |
1264 | dma_addr_t dstData2, /* Physical address of second destination buffer */ | |
1265 | size_t numBytes /* Number of bytes in each destination buffer */ | |
1266 | ) { | |
1267 | DMA_Channel_t *channel; | |
1268 | DMA_DeviceAttribute_t *devAttr; | |
1269 | int numDst1Descriptors; | |
1270 | int numDst2Descriptors; | |
1271 | int numDescriptors; | |
1272 | size_t ringBytesRequired; | |
1273 | int rc = 0; | |
1274 | ||
1275 | channel = HandleToChannel(handle); | |
1276 | if (channel == NULL) { | |
1277 | return -ENODEV; | |
1278 | } | |
1279 | ||
1280 | devAttr = &DMA_gDeviceAttribute[channel->devType]; | |
1281 | ||
1282 | /* Figure out how many descriptors we need. */ | |
1283 | ||
1284 | /* printk("srcData: 0x%08x dstData: 0x%08x, numBytes: %d\n", */ | |
1285 | /* srcData, dstData, numBytes); */ | |
1286 | ||
1287 | numDst1Descriptors = | |
1288 | dmacHw_calculateDescriptorCount(&devAttr->config, (void *)srcData, | |
1289 | (void *)dstData1, numBytes); | |
1290 | if (numDst1Descriptors < 0) { | |
1291 | return -EINVAL; | |
1292 | } | |
1293 | numDst2Descriptors = | |
1294 | dmacHw_calculateDescriptorCount(&devAttr->config, (void *)srcData, | |
1295 | (void *)dstData2, numBytes); | |
1296 | if (numDst2Descriptors < 0) { | |
1297 | return -EINVAL; | |
1298 | } | |
1299 | numDescriptors = numDst1Descriptors + numDst2Descriptors; | |
1300 | /* printk("numDescriptors: %d\n", numDescriptors); */ | |
1301 | ||
1302 | /* Check to see if we can reuse the existing descriptor ring, or if we need to allocate */ | |
1303 | /* a new one. */ | |
1304 | ||
1305 | ringBytesRequired = dmacHw_descriptorLen(numDescriptors); | |
1306 | ||
1307 | /* printk("ringBytesRequired: %d\n", ringBytesRequired); */ | |
1308 | ||
1309 | if (ringBytesRequired > devAttr->ring.bytesAllocated) { | |
1310 | /* Make sure that this code path is never taken from interrupt context. */ | |
1311 | /* It's OK for an interrupt to initiate a DMA transfer, but the descriptor */ | |
1312 | /* allocation needs to have already been done. */ | |
1313 | ||
1314 | might_sleep(); | |
1315 | ||
1316 | /* Free the old descriptor ring and allocate a new one. */ | |
1317 | ||
1318 | dma_free_descriptor_ring(&devAttr->ring); | |
1319 | ||
1320 | /* And allocate a new one. */ | |
1321 | ||
1322 | rc = | |
1323 | dma_alloc_descriptor_ring(&devAttr->ring, | |
1324 | numDescriptors); | |
1325 | if (rc < 0) { | |
1326 | printk(KERN_ERR | |
1327 | "%s: dma_alloc_descriptor_ring(%d) failed\n", | |
1328 | __func__, ringBytesRequired); | |
1329 | return rc; | |
1330 | } | |
1331 | } | |
1332 | ||
1333 | /* Setup the descriptor for this transfer. Since this function is used with */ | |
1334 | /* CONTINUOUS DMA operations, we need to reinitialize every time, otherwise */ | |
1335 | /* setDataDescriptor will keep trying to append onto the end. */ | |
1336 | ||
1337 | if (dmacHw_initDescriptor(devAttr->ring.virtAddr, | |
1338 | devAttr->ring.physAddr, | |
1339 | devAttr->ring.bytesAllocated, | |
1340 | numDescriptors) < 0) { | |
1341 | printk(KERN_ERR "%s: dmacHw_initDescriptor failed\n", __func__); | |
1342 | return -EINVAL; | |
1343 | } | |
1344 | ||
1345 | /* dma_alloc/free both set the prevSrc/DstData to 0. If they happen to be the same */ | |
1346 | /* as last time, then we don't need to call setDataDescriptor again. */ | |
1347 | ||
1348 | if (dmacHw_setDataDescriptor(&devAttr->config, | |
1349 | devAttr->ring.virtAddr, | |
1350 | (void *)srcData, | |
1351 | (void *)dstData1, numBytes) < 0) { | |
1352 | printk(KERN_ERR "%s: dmacHw_setDataDescriptor 1 failed\n", | |
1353 | __func__); | |
1354 | return -EINVAL; | |
1355 | } | |
1356 | if (dmacHw_setDataDescriptor(&devAttr->config, | |
1357 | devAttr->ring.virtAddr, | |
1358 | (void *)srcData, | |
1359 | (void *)dstData2, numBytes) < 0) { | |
1360 | printk(KERN_ERR "%s: dmacHw_setDataDescriptor 2 failed\n", | |
1361 | __func__); | |
1362 | return -EINVAL; | |
1363 | } | |
1364 | ||
1365 | /* You should use dma_start_transfer rather than dma_transfer_xxx so we don't */ | |
1366 | /* try to make the 'prev' variables right. */ | |
1367 | ||
1368 | devAttr->prevSrcData = 0; | |
1369 | devAttr->prevDstData = 0; | |
1370 | devAttr->prevNumBytes = 0; | |
1371 | ||
1372 | return numDescriptors; | |
1373 | } | |
1374 | ||
1375 | EXPORT_SYMBOL(dma_alloc_double_dst_descriptors); | |
1376 | ||
1377 | /****************************************************************************/ | |
1378 | /** | |
1379 | * Initiates a transfer when the descriptors have already been setup. | |
1380 | * | |
1381 | * This is a special case, and normally, the dma_transfer_xxx functions should | |
1382 | * be used. | |
1383 | * | |
1384 | * @return | |
1385 | * 0 Transfer was started successfully | |
1386 | * -ENODEV Invalid handle | |
1387 | */ | |
1388 | /****************************************************************************/ | |
1389 | ||
1390 | int dma_start_transfer(DMA_Handle_t handle) | |
1391 | { | |
1392 | DMA_Channel_t *channel; | |
1393 | DMA_DeviceAttribute_t *devAttr; | |
1394 | ||
1395 | channel = HandleToChannel(handle); | |
1396 | if (channel == NULL) { | |
1397 | return -ENODEV; | |
1398 | } | |
1399 | devAttr = &DMA_gDeviceAttribute[channel->devType]; | |
1400 | ||
1401 | dmacHw_initiateTransfer(channel->dmacHwHandle, &devAttr->config, | |
1402 | devAttr->ring.virtAddr); | |
1403 | ||
1404 | /* Since we got this far, everything went successfully */ | |
1405 | ||
1406 | return 0; | |
1407 | } | |
1408 | ||
1409 | EXPORT_SYMBOL(dma_start_transfer); | |
1410 | ||
1411 | /****************************************************************************/ | |
1412 | /** | |
1413 | * Stops a previously started DMA transfer. | |
1414 | * | |
1415 | * @return | |
1416 | * 0 Transfer was stopped successfully | |
1417 | * -ENODEV Invalid handle | |
1418 | */ | |
1419 | /****************************************************************************/ | |
1420 | ||
1421 | int dma_stop_transfer(DMA_Handle_t handle) | |
1422 | { | |
1423 | DMA_Channel_t *channel; | |
1424 | ||
1425 | channel = HandleToChannel(handle); | |
1426 | if (channel == NULL) { | |
1427 | return -ENODEV; | |
1428 | } | |
1429 | ||
1430 | dmacHw_stopTransfer(channel->dmacHwHandle); | |
1431 | ||
1432 | return 0; | |
1433 | } | |
1434 | ||
1435 | EXPORT_SYMBOL(dma_stop_transfer); | |
1436 | ||
1437 | /****************************************************************************/ | |
1438 | /** | |
1439 | * Waits for a DMA to complete by polling. This function is only intended | |
1440 | * to be used for testing. Interrupts should be used for most DMA operations. | |
1441 | */ | |
1442 | /****************************************************************************/ | |
1443 | ||
1444 | int dma_wait_transfer_done(DMA_Handle_t handle) | |
1445 | { | |
1446 | DMA_Channel_t *channel; | |
1447 | dmacHw_TRANSFER_STATUS_e status; | |
1448 | ||
1449 | channel = HandleToChannel(handle); | |
1450 | if (channel == NULL) { | |
1451 | return -ENODEV; | |
1452 | } | |
1453 | ||
1454 | while ((status = | |
1455 | dmacHw_transferCompleted(channel->dmacHwHandle)) == | |
1456 | dmacHw_TRANSFER_STATUS_BUSY) { | |
1457 | ; | |
1458 | } | |
1459 | ||
1460 | if (status == dmacHw_TRANSFER_STATUS_ERROR) { | |
1461 | printk(KERN_ERR "%s: DMA transfer failed\n", __func__); | |
1462 | return -EIO; | |
1463 | } | |
1464 | return 0; | |
1465 | } | |
1466 | ||
1467 | EXPORT_SYMBOL(dma_wait_transfer_done); | |
1468 | ||
1469 | /****************************************************************************/ | |
1470 | /** | |
1471 | * Initiates a DMA, allocating the descriptors as required. | |
1472 | * | |
1473 | * @return | |
1474 | * 0 Transfer was started successfully | |
1475 | * -EINVAL Invalid device type for this kind of transfer | |
1476 | * (i.e. the device is _DEV_TO_MEM and not _MEM_TO_DEV) | |
1477 | */ | |
1478 | /****************************************************************************/ | |
1479 | ||
1480 | int dma_transfer(DMA_Handle_t handle, /* DMA Handle */ | |
1481 | dmacHw_TRANSFER_TYPE_e transferType, /* Type of transfer being performed */ | |
1482 | dma_addr_t srcData, /* Place to get data to write to device */ | |
1483 | dma_addr_t dstData, /* Pointer to device data address */ | |
1484 | size_t numBytes /* Number of bytes to transfer to the device */ | |
1485 | ) { | |
1486 | DMA_Channel_t *channel; | |
1487 | DMA_DeviceAttribute_t *devAttr; | |
1488 | int rc = 0; | |
1489 | ||
1490 | channel = HandleToChannel(handle); | |
1491 | if (channel == NULL) { | |
1492 | return -ENODEV; | |
1493 | } | |
1494 | ||
1495 | devAttr = &DMA_gDeviceAttribute[channel->devType]; | |
1496 | ||
1497 | if (devAttr->config.transferType != transferType) { | |
1498 | return -EINVAL; | |
1499 | } | |
1500 | ||
1501 | /* We keep track of the information about the previous request for this */ | |
1502 | /* device, and if the attributes match, then we can use the descriptors we setup */ | |
1503 | /* the last time, and not have to reinitialize everything. */ | |
1504 | ||
1505 | { | |
1506 | rc = | |
1507 | dma_alloc_descriptors(handle, transferType, srcData, | |
1508 | dstData, numBytes); | |
1509 | if (rc != 0) { | |
1510 | return rc; | |
1511 | } | |
1512 | } | |
1513 | ||
1514 | /* And kick off the transfer */ | |
1515 | ||
1516 | devAttr->numBytes = numBytes; | |
1517 | devAttr->transferStartTime = timer_get_tick_count(); | |
1518 | ||
1519 | dmacHw_initiateTransfer(channel->dmacHwHandle, &devAttr->config, | |
1520 | devAttr->ring.virtAddr); | |
1521 | ||
1522 | /* Since we got this far, everything went successfully */ | |
1523 | ||
1524 | return 0; | |
1525 | } | |
1526 | ||
1527 | EXPORT_SYMBOL(dma_transfer); | |
1528 | ||
1529 | /****************************************************************************/ | |
1530 | /** | |
1531 | * Set the callback function which will be called when a transfer completes. | |
1532 | * If a NULL callback function is set, then no callback will occur. | |
1533 | * | |
1534 | * @note @a devHandler will be called from IRQ context. | |
1535 | * | |
1536 | * @return | |
1537 | * 0 - Success | |
1538 | * -ENODEV - Device handed in is invalid. | |
1539 | */ | |
1540 | /****************************************************************************/ | |
1541 | ||
1542 | int dma_set_device_handler(DMA_Device_t dev, /* Device to set the callback for. */ | |
1543 | DMA_DeviceHandler_t devHandler, /* Function to call when the DMA completes */ | |
1544 | void *userData /* Pointer which will be passed to devHandler. */ | |
1545 | ) { | |
1546 | DMA_DeviceAttribute_t *devAttr; | |
1547 | unsigned long flags; | |
1548 | ||
1549 | if (!IsDeviceValid(dev)) { | |
1550 | return -ENODEV; | |
1551 | } | |
1552 | devAttr = &DMA_gDeviceAttribute[dev]; | |
1553 | ||
1554 | local_irq_save(flags); | |
1555 | ||
1556 | devAttr->userData = userData; | |
1557 | devAttr->devHandler = devHandler; | |
1558 | ||
1559 | local_irq_restore(flags); | |
1560 | ||
1561 | return 0; | |
1562 | } | |
1563 | ||
1564 | EXPORT_SYMBOL(dma_set_device_handler); | |
1565 | ||
1566 | /****************************************************************************/ | |
1567 | /** | |
1568 | * Initializes a memory mapping structure | |
1569 | */ | |
1570 | /****************************************************************************/ | |
1571 | ||
1572 | int dma_init_mem_map(DMA_MemMap_t *memMap) | |
1573 | { | |
1574 | memset(memMap, 0, sizeof(*memMap)); | |
1575 | ||
1576 | init_MUTEX(&memMap->lock); | |
1577 | ||
1578 | return 0; | |
1579 | } | |
1580 | ||
1581 | EXPORT_SYMBOL(dma_init_mem_map); | |
1582 | ||
1583 | /****************************************************************************/ | |
1584 | /** | |
1585 | * Releases any memory currently being held by a memory mapping structure. | |
1586 | */ | |
1587 | /****************************************************************************/ | |
1588 | ||
1589 | int dma_term_mem_map(DMA_MemMap_t *memMap) | |
1590 | { | |
1591 | down(&memMap->lock); /* Just being paranoid */ | |
1592 | ||
1593 | /* Free up any allocated memory */ | |
1594 | ||
1595 | up(&memMap->lock); | |
1596 | memset(memMap, 0, sizeof(*memMap)); | |
1597 | ||
1598 | return 0; | |
1599 | } | |
1600 | ||
1601 | EXPORT_SYMBOL(dma_term_mem_map); | |
1602 | ||
1603 | /****************************************************************************/ | |
1604 | /** | |
1605 | * Looks at a memory address and categorizes it. | |
1606 | * | |
1607 | * @return One of the values from the DMA_MemType_t enumeration. | |
1608 | */ | |
1609 | /****************************************************************************/ | |
1610 | ||
1611 | DMA_MemType_t dma_mem_type(void *addr) | |
1612 | { | |
1613 | unsigned long addrVal = (unsigned long)addr; | |
1614 | ||
1615 | if (addrVal >= VMALLOC_END) { | |
1616 | /* NOTE: DMA virtual memory space starts at 0xFFxxxxxx */ | |
1617 | ||
1618 | /* dma_alloc_xxx pages are physically and virtually contiguous */ | |
1619 | ||
1620 | return DMA_MEM_TYPE_DMA; | |
1621 | } | |
1622 | ||
1623 | /* Technically, we could add one more classification. Addresses between VMALLOC_END */ | |
1624 | /* and the beginning of the DMA virtual address could be considered to be I/O space. */ | |
1625 | /* Right now, nobody cares about this particular classification, so we ignore it. */ | |
1626 | ||
1627 | if (is_vmalloc_addr(addr)) { | |
1628 | /* Address comes from the vmalloc'd region. Pages are virtually */ | |
1629 | /* contiguous but NOT physically contiguous */ | |
1630 | ||
1631 | return DMA_MEM_TYPE_VMALLOC; | |
1632 | } | |
1633 | ||
1634 | if (addrVal >= PAGE_OFFSET) { | |
1635 | /* PAGE_OFFSET is typically 0xC0000000 */ | |
1636 | ||
1637 | /* kmalloc'd pages are physically contiguous */ | |
1638 | ||
1639 | return DMA_MEM_TYPE_KMALLOC; | |
1640 | } | |
1641 | ||
1642 | return DMA_MEM_TYPE_USER; | |
1643 | } | |
1644 | ||
1645 | EXPORT_SYMBOL(dma_mem_type); | |
1646 | ||
1647 | /****************************************************************************/ | |
1648 | /** | |
1649 | * Looks at a memory address and determines if we support DMA'ing to/from | |
1650 | * that type of memory. | |
1651 | * | |
1652 | * @return boolean - | |
1653 | * return value != 0 means dma supported | |
1654 | * return value == 0 means dma not supported | |
1655 | */ | |
1656 | /****************************************************************************/ | |
1657 | ||
1658 | int dma_mem_supports_dma(void *addr) | |
1659 | { | |
1660 | DMA_MemType_t memType = dma_mem_type(addr); | |
1661 | ||
1662 | return (memType == DMA_MEM_TYPE_DMA) | |
1663 | #if ALLOW_MAP_OF_KMALLOC_MEMORY | |
1664 | || (memType == DMA_MEM_TYPE_KMALLOC) | |
1665 | #endif | |
1666 | || (memType == DMA_MEM_TYPE_USER); | |
1667 | } | |
1668 | ||
1669 | EXPORT_SYMBOL(dma_mem_supports_dma); | |
1670 | ||
1671 | /****************************************************************************/ | |
1672 | /** | |
1673 | * Maps in a memory region such that it can be used for performing a DMA. | |
1674 | * | |
1675 | * @return | |
1676 | */ | |
1677 | /****************************************************************************/ | |
1678 | ||
1679 | int dma_map_start(DMA_MemMap_t *memMap, /* Stores state information about the map */ | |
1680 | enum dma_data_direction dir /* Direction that the mapping will be going */ | |
1681 | ) { | |
1682 | int rc; | |
1683 | ||
1684 | down(&memMap->lock); | |
1685 | ||
1686 | DMA_MAP_PRINT("memMap: %p\n", memMap); | |
1687 | ||
1688 | if (memMap->inUse) { | |
1689 | printk(KERN_ERR "%s: memory map %p is already being used\n", | |
1690 | __func__, memMap); | |
1691 | rc = -EBUSY; | |
1692 | goto out; | |
1693 | } | |
1694 | ||
1695 | memMap->inUse = 1; | |
1696 | memMap->dir = dir; | |
1697 | memMap->numRegionsUsed = 0; | |
1698 | ||
1699 | rc = 0; | |
1700 | ||
1701 | out: | |
1702 | ||
1703 | DMA_MAP_PRINT("returning %d", rc); | |
1704 | ||
1705 | up(&memMap->lock); | |
1706 | ||
1707 | return rc; | |
1708 | } | |
1709 | ||
1710 | EXPORT_SYMBOL(dma_map_start); | |
1711 | ||
1712 | /****************************************************************************/ | |
1713 | /** | |
1714 | * Adds a segment of memory to a memory map. Each segment is both | |
1715 | * physically and virtually contiguous. | |
1716 | * | |
1717 | * @return 0 on success, error code otherwise. | |
1718 | */ | |
1719 | /****************************************************************************/ | |
1720 | ||
1721 | static int dma_map_add_segment(DMA_MemMap_t *memMap, /* Stores state information about the map */ | |
1722 | DMA_Region_t *region, /* Region that the segment belongs to */ | |
1723 | void *virtAddr, /* Virtual address of the segment being added */ | |
1724 | dma_addr_t physAddr, /* Physical address of the segment being added */ | |
1725 | size_t numBytes /* Number of bytes of the segment being added */ | |
1726 | ) { | |
1727 | DMA_Segment_t *segment; | |
1728 | ||
1729 | DMA_MAP_PRINT("memMap:%p va:%p pa:0x%x #:%d\n", memMap, virtAddr, | |
1730 | physAddr, numBytes); | |
1731 | ||
1732 | /* Sanity check */ | |
1733 | ||
1734 | if (((unsigned long)virtAddr < (unsigned long)region->virtAddr) | |
1735 | || (((unsigned long)virtAddr + numBytes)) > | |
1736 | ((unsigned long)region->virtAddr + region->numBytes)) { | |
1737 | printk(KERN_ERR | |
1738 | "%s: virtAddr %p is outside region @ %p len: %d\n", | |
1739 | __func__, virtAddr, region->virtAddr, region->numBytes); | |
1740 | return -EINVAL; | |
1741 | } | |
1742 | ||
1743 | if (region->numSegmentsUsed > 0) { | |
1744 | /* Check to see if this segment is physically contiguous with the previous one */ | |
1745 | ||
1746 | segment = ®ion->segment[region->numSegmentsUsed - 1]; | |
1747 | ||
1748 | if ((segment->physAddr + segment->numBytes) == physAddr) { | |
1749 | /* It is - just add on to the end */ | |
1750 | ||
1751 | DMA_MAP_PRINT("appending %d bytes to last segment\n", | |
1752 | numBytes); | |
1753 | ||
1754 | segment->numBytes += numBytes; | |
1755 | ||
1756 | return 0; | |
1757 | } | |
1758 | } | |
1759 | ||
1760 | /* Reallocate to hold more segments, if required. */ | |
1761 | ||
1762 | if (region->numSegmentsUsed >= region->numSegmentsAllocated) { | |
1763 | DMA_Segment_t *newSegment; | |
1764 | size_t oldSize = | |
1765 | region->numSegmentsAllocated * sizeof(*newSegment); | |
1766 | int newAlloc = region->numSegmentsAllocated + 4; | |
1767 | size_t newSize = newAlloc * sizeof(*newSegment); | |
1768 | ||
1769 | newSegment = kmalloc(newSize, GFP_KERNEL); | |
1770 | if (newSegment == NULL) { | |
1771 | return -ENOMEM; | |
1772 | } | |
1773 | memcpy(newSegment, region->segment, oldSize); | |
1774 | memset(&((uint8_t *) newSegment)[oldSize], 0, | |
1775 | newSize - oldSize); | |
1776 | kfree(region->segment); | |
1777 | ||
1778 | region->numSegmentsAllocated = newAlloc; | |
1779 | region->segment = newSegment; | |
1780 | } | |
1781 | ||
1782 | segment = ®ion->segment[region->numSegmentsUsed]; | |
1783 | region->numSegmentsUsed++; | |
1784 | ||
1785 | segment->virtAddr = virtAddr; | |
1786 | segment->physAddr = physAddr; | |
1787 | segment->numBytes = numBytes; | |
1788 | ||
1789 | DMA_MAP_PRINT("returning success\n"); | |
1790 | ||
1791 | return 0; | |
1792 | } | |
1793 | ||
1794 | /****************************************************************************/ | |
1795 | /** | |
1796 | * Adds a region of memory to a memory map. Each region is virtually | |
1797 | * contiguous, but not necessarily physically contiguous. | |
1798 | * | |
1799 | * @return 0 on success, error code otherwise. | |
1800 | */ | |
1801 | /****************************************************************************/ | |
1802 | ||
1803 | int dma_map_add_region(DMA_MemMap_t *memMap, /* Stores state information about the map */ | |
1804 | void *mem, /* Virtual address that we want to get a map of */ | |
1805 | size_t numBytes /* Number of bytes being mapped */ | |
1806 | ) { | |
1807 | unsigned long addr = (unsigned long)mem; | |
1808 | unsigned int offset; | |
1809 | int rc = 0; | |
1810 | DMA_Region_t *region; | |
1811 | dma_addr_t physAddr; | |
1812 | ||
1813 | down(&memMap->lock); | |
1814 | ||
1815 | DMA_MAP_PRINT("memMap:%p va:%p #:%d\n", memMap, mem, numBytes); | |
1816 | ||
1817 | if (!memMap->inUse) { | |
1818 | printk(KERN_ERR "%s: Make sure you call dma_map_start first\n", | |
1819 | __func__); | |
1820 | rc = -EINVAL; | |
1821 | goto out; | |
1822 | } | |
1823 | ||
1824 | /* Reallocate to hold more regions. */ | |
1825 | ||
1826 | if (memMap->numRegionsUsed >= memMap->numRegionsAllocated) { | |
1827 | DMA_Region_t *newRegion; | |
1828 | size_t oldSize = | |
1829 | memMap->numRegionsAllocated * sizeof(*newRegion); | |
1830 | int newAlloc = memMap->numRegionsAllocated + 4; | |
1831 | size_t newSize = newAlloc * sizeof(*newRegion); | |
1832 | ||
1833 | newRegion = kmalloc(newSize, GFP_KERNEL); | |
1834 | if (newRegion == NULL) { | |
1835 | rc = -ENOMEM; | |
1836 | goto out; | |
1837 | } | |
1838 | memcpy(newRegion, memMap->region, oldSize); | |
1839 | memset(&((uint8_t *) newRegion)[oldSize], 0, newSize - oldSize); | |
1840 | ||
1841 | kfree(memMap->region); | |
1842 | ||
1843 | memMap->numRegionsAllocated = newAlloc; | |
1844 | memMap->region = newRegion; | |
1845 | } | |
1846 | ||
1847 | region = &memMap->region[memMap->numRegionsUsed]; | |
1848 | memMap->numRegionsUsed++; | |
1849 | ||
1850 | offset = addr & ~PAGE_MASK; | |
1851 | ||
1852 | region->memType = dma_mem_type(mem); | |
1853 | region->virtAddr = mem; | |
1854 | region->numBytes = numBytes; | |
1855 | region->numSegmentsUsed = 0; | |
1856 | region->numLockedPages = 0; | |
1857 | region->lockedPages = NULL; | |
1858 | ||
1859 | switch (region->memType) { | |
1860 | case DMA_MEM_TYPE_VMALLOC: | |
1861 | { | |
1862 | atomic_inc(&gDmaStatMemTypeVmalloc); | |
1863 | ||
1864 | /* printk(KERN_ERR "%s: vmalloc'd pages are not supported\n", __func__); */ | |
1865 | ||
1866 | /* vmalloc'd pages are not physically contiguous */ | |
1867 | ||
1868 | rc = -EINVAL; | |
1869 | break; | |
1870 | } | |
1871 | ||
1872 | case DMA_MEM_TYPE_KMALLOC: | |
1873 | { | |
1874 | atomic_inc(&gDmaStatMemTypeKmalloc); | |
1875 | ||
1876 | /* kmalloc'd pages are physically contiguous, so they'll have exactly */ | |
1877 | /* one segment */ | |
1878 | ||
1879 | #if ALLOW_MAP_OF_KMALLOC_MEMORY | |
1880 | physAddr = | |
1881 | dma_map_single(NULL, mem, numBytes, memMap->dir); | |
1882 | rc = dma_map_add_segment(memMap, region, mem, physAddr, | |
1883 | numBytes); | |
1884 | #else | |
1885 | rc = -EINVAL; | |
1886 | #endif | |
1887 | break; | |
1888 | } | |
1889 | ||
1890 | case DMA_MEM_TYPE_DMA: | |
1891 | { | |
1892 | /* dma_alloc_xxx pages are physically contiguous */ | |
1893 | ||
1894 | atomic_inc(&gDmaStatMemTypeCoherent); | |
1895 | ||
1896 | physAddr = (vmalloc_to_pfn(mem) << PAGE_SHIFT) + offset; | |
1897 | ||
1898 | dma_sync_single_for_cpu(NULL, physAddr, numBytes, | |
1899 | memMap->dir); | |
1900 | rc = dma_map_add_segment(memMap, region, mem, physAddr, | |
1901 | numBytes); | |
1902 | break; | |
1903 | } | |
1904 | ||
1905 | case DMA_MEM_TYPE_USER: | |
1906 | { | |
1907 | size_t firstPageOffset; | |
1908 | size_t firstPageSize; | |
1909 | struct page **pages; | |
1910 | struct task_struct *userTask; | |
1911 | ||
1912 | atomic_inc(&gDmaStatMemTypeUser); | |
1913 | ||
1914 | #if 1 | |
1915 | /* If the pages are user pages, then the dma_mem_map_set_user_task function */ | |
1916 | /* must have been previously called. */ | |
1917 | ||
1918 | if (memMap->userTask == NULL) { | |
1919 | printk(KERN_ERR | |
1920 | "%s: must call dma_mem_map_set_user_task when using user-mode memory\n", | |
1921 | __func__); | |
1922 | return -EINVAL; | |
1923 | } | |
1924 | ||
1925 | /* User pages need to be locked. */ | |
1926 | ||
1927 | firstPageOffset = | |
1928 | (unsigned long)region->virtAddr & (PAGE_SIZE - 1); | |
1929 | firstPageSize = PAGE_SIZE - firstPageOffset; | |
1930 | ||
1931 | region->numLockedPages = (firstPageOffset | |
1932 | + region->numBytes + | |
1933 | PAGE_SIZE - 1) / PAGE_SIZE; | |
1934 | pages = | |
1935 | kmalloc(region->numLockedPages * | |
1936 | sizeof(struct page *), GFP_KERNEL); | |
1937 | ||
1938 | if (pages == NULL) { | |
1939 | region->numLockedPages = 0; | |
1940 | return -ENOMEM; | |
1941 | } | |
1942 | ||
1943 | userTask = memMap->userTask; | |
1944 | ||
1945 | down_read(&userTask->mm->mmap_sem); | |
1946 | rc = get_user_pages(userTask, /* task */ | |
1947 | userTask->mm, /* mm */ | |
1948 | (unsigned long)region->virtAddr, /* start */ | |
1949 | region->numLockedPages, /* len */ | |
1950 | memMap->dir == DMA_FROM_DEVICE, /* write */ | |
1951 | 0, /* force */ | |
1952 | pages, /* pages (array of pointers to page) */ | |
1953 | NULL); /* vmas */ | |
1954 | up_read(&userTask->mm->mmap_sem); | |
1955 | ||
1956 | if (rc != region->numLockedPages) { | |
1957 | kfree(pages); | |
1958 | region->numLockedPages = 0; | |
1959 | ||
1960 | if (rc >= 0) { | |
1961 | rc = -EINVAL; | |
1962 | } | |
1963 | } else { | |
1964 | uint8_t *virtAddr = region->virtAddr; | |
1965 | size_t bytesRemaining; | |
1966 | int pageIdx; | |
1967 | ||
1968 | rc = 0; /* Since get_user_pages returns +ve number */ | |
1969 | ||
1970 | region->lockedPages = pages; | |
1971 | ||
1972 | /* We've locked the user pages. Now we need to walk them and figure */ | |
1973 | /* out the physical addresses. */ | |
1974 | ||
1975 | /* The first page may be partial */ | |
1976 | ||
1977 | dma_map_add_segment(memMap, | |
1978 | region, | |
1979 | virtAddr, | |
1980 | PFN_PHYS(page_to_pfn | |
1981 | (pages[0])) + | |
1982 | firstPageOffset, | |
1983 | firstPageSize); | |
1984 | ||
1985 | virtAddr += firstPageSize; | |
1986 | bytesRemaining = | |
1987 | region->numBytes - firstPageSize; | |
1988 | ||
1989 | for (pageIdx = 1; | |
1990 | pageIdx < region->numLockedPages; | |
1991 | pageIdx++) { | |
1992 | size_t bytesThisPage = | |
1993 | (bytesRemaining > | |
1994 | PAGE_SIZE ? PAGE_SIZE : | |
1995 | bytesRemaining); | |
1996 | ||
1997 | DMA_MAP_PRINT | |
1998 | ("pageIdx:%d pages[pageIdx]=%p pfn=%u phys=%u\n", | |
1999 | pageIdx, pages[pageIdx], | |
2000 | page_to_pfn(pages[pageIdx]), | |
2001 | PFN_PHYS(page_to_pfn | |
2002 | (pages[pageIdx]))); | |
2003 | ||
2004 | dma_map_add_segment(memMap, | |
2005 | region, | |
2006 | virtAddr, | |
2007 | PFN_PHYS(page_to_pfn | |
2008 | (pages | |
2009 | [pageIdx])), | |
2010 | bytesThisPage); | |
2011 | ||
2012 | virtAddr += bytesThisPage; | |
2013 | bytesRemaining -= bytesThisPage; | |
2014 | } | |
2015 | } | |
2016 | #else | |
2017 | printk(KERN_ERR | |
2018 | "%s: User mode pages are not yet supported\n", | |
2019 | __func__); | |
2020 | ||
2021 | /* user pages are not physically contiguous */ | |
2022 | ||
2023 | rc = -EINVAL; | |
2024 | #endif | |
2025 | break; | |
2026 | } | |
2027 | ||
2028 | default: | |
2029 | { | |
2030 | printk(KERN_ERR "%s: Unsupported memory type: %d\n", | |
2031 | __func__, region->memType); | |
2032 | ||
2033 | rc = -EINVAL; | |
2034 | break; | |
2035 | } | |
2036 | } | |
2037 | ||
2038 | if (rc != 0) { | |
2039 | memMap->numRegionsUsed--; | |
2040 | } | |
2041 | ||
2042 | out: | |
2043 | ||
2044 | DMA_MAP_PRINT("returning %d\n", rc); | |
2045 | ||
2046 | up(&memMap->lock); | |
2047 | ||
2048 | return rc; | |
2049 | } | |
2050 | ||
2051 | EXPORT_SYMBOL(dma_map_add_segment); | |
2052 | ||
2053 | /****************************************************************************/ | |
2054 | /** | |
2055 | * Maps in a memory region such that it can be used for performing a DMA. | |
2056 | * | |
2057 | * @return 0 on success, error code otherwise. | |
2058 | */ | |
2059 | /****************************************************************************/ | |
2060 | ||
2061 | int dma_map_mem(DMA_MemMap_t *memMap, /* Stores state information about the map */ | |
2062 | void *mem, /* Virtual address that we want to get a map of */ | |
2063 | size_t numBytes, /* Number of bytes being mapped */ | |
2064 | enum dma_data_direction dir /* Direction that the mapping will be going */ | |
2065 | ) { | |
2066 | int rc; | |
2067 | ||
2068 | rc = dma_map_start(memMap, dir); | |
2069 | if (rc == 0) { | |
2070 | rc = dma_map_add_region(memMap, mem, numBytes); | |
2071 | if (rc < 0) { | |
2072 | /* Since the add fails, this function will fail, and the caller won't */ | |
2073 | /* call unmap, so we need to do it here. */ | |
2074 | ||
2075 | dma_unmap(memMap, 0); | |
2076 | } | |
2077 | } | |
2078 | ||
2079 | return rc; | |
2080 | } | |
2081 | ||
2082 | EXPORT_SYMBOL(dma_map_mem); | |
2083 | ||
2084 | /****************************************************************************/ | |
2085 | /** | |
2086 | * Setup a descriptor ring for a given memory map. | |
2087 | * | |
2088 | * It is assumed that the descriptor ring has already been initialized, and | |
2089 | * this routine will only reallocate a new descriptor ring if the existing | |
2090 | * one is too small. | |
2091 | * | |
2092 | * @return 0 on success, error code otherwise. | |
2093 | */ | |
2094 | /****************************************************************************/ | |
2095 | ||
2096 | int dma_map_create_descriptor_ring(DMA_Device_t dev, /* DMA device (where the ring is stored) */ | |
2097 | DMA_MemMap_t *memMap, /* Memory map that will be used */ | |
2098 | dma_addr_t devPhysAddr /* Physical address of device */ | |
2099 | ) { | |
2100 | int rc; | |
2101 | int numDescriptors; | |
2102 | DMA_DeviceAttribute_t *devAttr; | |
2103 | DMA_Region_t *region; | |
2104 | DMA_Segment_t *segment; | |
2105 | dma_addr_t srcPhysAddr; | |
2106 | dma_addr_t dstPhysAddr; | |
2107 | int regionIdx; | |
2108 | int segmentIdx; | |
2109 | ||
2110 | devAttr = &DMA_gDeviceAttribute[dev]; | |
2111 | ||
2112 | down(&memMap->lock); | |
2113 | ||
2114 | /* Figure out how many descriptors we need */ | |
2115 | ||
2116 | numDescriptors = 0; | |
2117 | for (regionIdx = 0; regionIdx < memMap->numRegionsUsed; regionIdx++) { | |
2118 | region = &memMap->region[regionIdx]; | |
2119 | ||
2120 | for (segmentIdx = 0; segmentIdx < region->numSegmentsUsed; | |
2121 | segmentIdx++) { | |
2122 | segment = ®ion->segment[segmentIdx]; | |
2123 | ||
2124 | if (memMap->dir == DMA_TO_DEVICE) { | |
2125 | srcPhysAddr = segment->physAddr; | |
2126 | dstPhysAddr = devPhysAddr; | |
2127 | } else { | |
2128 | srcPhysAddr = devPhysAddr; | |
2129 | dstPhysAddr = segment->physAddr; | |
2130 | } | |
2131 | ||
2132 | rc = | |
2133 | dma_calculate_descriptor_count(dev, srcPhysAddr, | |
2134 | dstPhysAddr, | |
2135 | segment-> | |
2136 | numBytes); | |
2137 | if (rc < 0) { | |
2138 | printk(KERN_ERR | |
2139 | "%s: dma_calculate_descriptor_count failed: %d\n", | |
2140 | __func__, rc); | |
2141 | goto out; | |
2142 | } | |
2143 | numDescriptors += rc; | |
2144 | } | |
2145 | } | |
2146 | ||
2147 | /* Adjust the size of the ring, if it isn't big enough */ | |
2148 | ||
2149 | if (numDescriptors > devAttr->ring.descriptorsAllocated) { | |
2150 | dma_free_descriptor_ring(&devAttr->ring); | |
2151 | rc = | |
2152 | dma_alloc_descriptor_ring(&devAttr->ring, | |
2153 | numDescriptors); | |
2154 | if (rc < 0) { | |
2155 | printk(KERN_ERR | |
2156 | "%s: dma_alloc_descriptor_ring failed: %d\n", | |
2157 | __func__, rc); | |
2158 | goto out; | |
2159 | } | |
2160 | } else { | |
2161 | rc = | |
2162 | dma_init_descriptor_ring(&devAttr->ring, | |
2163 | numDescriptors); | |
2164 | if (rc < 0) { | |
2165 | printk(KERN_ERR | |
2166 | "%s: dma_init_descriptor_ring failed: %d\n", | |
2167 | __func__, rc); | |
2168 | goto out; | |
2169 | } | |
2170 | } | |
2171 | ||
2172 | /* Populate the descriptors */ | |
2173 | ||
2174 | for (regionIdx = 0; regionIdx < memMap->numRegionsUsed; regionIdx++) { | |
2175 | region = &memMap->region[regionIdx]; | |
2176 | ||
2177 | for (segmentIdx = 0; segmentIdx < region->numSegmentsUsed; | |
2178 | segmentIdx++) { | |
2179 | segment = ®ion->segment[segmentIdx]; | |
2180 | ||
2181 | if (memMap->dir == DMA_TO_DEVICE) { | |
2182 | srcPhysAddr = segment->physAddr; | |
2183 | dstPhysAddr = devPhysAddr; | |
2184 | } else { | |
2185 | srcPhysAddr = devPhysAddr; | |
2186 | dstPhysAddr = segment->physAddr; | |
2187 | } | |
2188 | ||
2189 | rc = | |
2190 | dma_add_descriptors(&devAttr->ring, dev, | |
2191 | srcPhysAddr, dstPhysAddr, | |
2192 | segment->numBytes); | |
2193 | if (rc < 0) { | |
2194 | printk(KERN_ERR | |
2195 | "%s: dma_add_descriptors failed: %d\n", | |
2196 | __func__, rc); | |
2197 | goto out; | |
2198 | } | |
2199 | } | |
2200 | } | |
2201 | ||
2202 | rc = 0; | |
2203 | ||
2204 | out: | |
2205 | ||
2206 | up(&memMap->lock); | |
2207 | return rc; | |
2208 | } | |
2209 | ||
2210 | EXPORT_SYMBOL(dma_map_create_descriptor_ring); | |
2211 | ||
2212 | /****************************************************************************/ | |
2213 | /** | |
2214 | * Maps in a memory region such that it can be used for performing a DMA. | |
2215 | * | |
2216 | * @return | |
2217 | */ | |
2218 | /****************************************************************************/ | |
2219 | ||
2220 | int dma_unmap(DMA_MemMap_t *memMap, /* Stores state information about the map */ | |
2221 | int dirtied /* non-zero if any of the pages were modified */ | |
2222 | ) { | |
2223 | int regionIdx; | |
2224 | int segmentIdx; | |
2225 | DMA_Region_t *region; | |
2226 | DMA_Segment_t *segment; | |
2227 | ||
2228 | for (regionIdx = 0; regionIdx < memMap->numRegionsUsed; regionIdx++) { | |
2229 | region = &memMap->region[regionIdx]; | |
2230 | ||
2231 | for (segmentIdx = 0; segmentIdx < region->numSegmentsUsed; | |
2232 | segmentIdx++) { | |
2233 | segment = ®ion->segment[segmentIdx]; | |
2234 | ||
2235 | switch (region->memType) { | |
2236 | case DMA_MEM_TYPE_VMALLOC: | |
2237 | { | |
2238 | printk(KERN_ERR | |
2239 | "%s: vmalloc'd pages are not yet supported\n", | |
2240 | __func__); | |
2241 | return -EINVAL; | |
2242 | } | |
2243 | ||
2244 | case DMA_MEM_TYPE_KMALLOC: | |
2245 | { | |
2246 | #if ALLOW_MAP_OF_KMALLOC_MEMORY | |
2247 | dma_unmap_single(NULL, | |
2248 | segment->physAddr, | |
2249 | segment->numBytes, | |
2250 | memMap->dir); | |
2251 | #endif | |
2252 | break; | |
2253 | } | |
2254 | ||
2255 | case DMA_MEM_TYPE_DMA: | |
2256 | { | |
2257 | dma_sync_single_for_cpu(NULL, | |
2258 | segment-> | |
2259 | physAddr, | |
2260 | segment-> | |
2261 | numBytes, | |
2262 | memMap->dir); | |
2263 | break; | |
2264 | } | |
2265 | ||
2266 | case DMA_MEM_TYPE_USER: | |
2267 | { | |
2268 | /* Nothing to do here. */ | |
2269 | ||
2270 | break; | |
2271 | } | |
2272 | ||
2273 | default: | |
2274 | { | |
2275 | printk(KERN_ERR | |
2276 | "%s: Unsupported memory type: %d\n", | |
2277 | __func__, region->memType); | |
2278 | return -EINVAL; | |
2279 | } | |
2280 | } | |
2281 | ||
2282 | segment->virtAddr = NULL; | |
2283 | segment->physAddr = 0; | |
2284 | segment->numBytes = 0; | |
2285 | } | |
2286 | ||
2287 | if (region->numLockedPages > 0) { | |
2288 | int pageIdx; | |
2289 | ||
2290 | /* Some user pages were locked. We need to go and unlock them now. */ | |
2291 | ||
2292 | for (pageIdx = 0; pageIdx < region->numLockedPages; | |
2293 | pageIdx++) { | |
2294 | struct page *page = | |
2295 | region->lockedPages[pageIdx]; | |
2296 | ||
2297 | if (memMap->dir == DMA_FROM_DEVICE) { | |
2298 | SetPageDirty(page); | |
2299 | } | |
2300 | page_cache_release(page); | |
2301 | } | |
2302 | kfree(region->lockedPages); | |
2303 | region->numLockedPages = 0; | |
2304 | region->lockedPages = NULL; | |
2305 | } | |
2306 | ||
2307 | region->memType = DMA_MEM_TYPE_NONE; | |
2308 | region->virtAddr = NULL; | |
2309 | region->numBytes = 0; | |
2310 | region->numSegmentsUsed = 0; | |
2311 | } | |
2312 | memMap->userTask = NULL; | |
2313 | memMap->numRegionsUsed = 0; | |
2314 | memMap->inUse = 0; | |
2315 | ||
2316 | up(&memMap->lock); | |
2317 | ||
2318 | return 0; | |
2319 | } | |
2320 | ||
2321 | EXPORT_SYMBOL(dma_unmap); |