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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> | |
5a0e3ad6 | 31 | #include <linux/slab.h> |
859277f7 LC |
32 | |
33 | #include <mach/timer.h> | |
34 | ||
35 | #include <linux/mm.h> | |
36 | #include <linux/pfn.h> | |
37 | #include <asm/atomic.h> | |
38 | #include <mach/dma.h> | |
39 | ||
40 | /* I don't quite understand why dc4 fails when this is set to 1 and DMA is enabled */ | |
41 | /* especially since dc4 doesn't use kmalloc'd memory. */ | |
42 | ||
43 | #define ALLOW_MAP_OF_KMALLOC_MEMORY 0 | |
44 | ||
45 | /* ---- Public Variables ------------------------------------------------- */ | |
46 | ||
47 | /* ---- Private Constants and Types -------------------------------------- */ | |
48 | ||
49 | #define MAKE_HANDLE(controllerIdx, channelIdx) (((controllerIdx) << 4) | (channelIdx)) | |
50 | ||
51 | #define CONTROLLER_FROM_HANDLE(handle) (((handle) >> 4) & 0x0f) | |
52 | #define CHANNEL_FROM_HANDLE(handle) ((handle) & 0x0f) | |
53 | ||
54 | #define DMA_MAP_DEBUG 0 | |
55 | ||
56 | #if DMA_MAP_DEBUG | |
57 | # define DMA_MAP_PRINT(fmt, args...) printk("%s: " fmt, __func__, ## args) | |
58 | #else | |
59 | # define DMA_MAP_PRINT(fmt, args...) | |
60 | #endif | |
61 | ||
62 | /* ---- Private Variables ------------------------------------------------ */ | |
63 | ||
64 | static DMA_Global_t gDMA; | |
65 | static struct proc_dir_entry *gDmaDir; | |
66 | ||
67 | static atomic_t gDmaStatMemTypeKmalloc = ATOMIC_INIT(0); | |
68 | static atomic_t gDmaStatMemTypeVmalloc = ATOMIC_INIT(0); | |
69 | static atomic_t gDmaStatMemTypeUser = ATOMIC_INIT(0); | |
70 | static atomic_t gDmaStatMemTypeCoherent = ATOMIC_INIT(0); | |
71 | ||
72 | #include "dma_device.c" | |
73 | ||
74 | /* ---- Private Function Prototypes -------------------------------------- */ | |
75 | ||
76 | /* ---- Functions ------------------------------------------------------- */ | |
77 | ||
78 | /****************************************************************************/ | |
79 | /** | |
80 | * Displays information for /proc/dma/mem-type | |
81 | */ | |
82 | /****************************************************************************/ | |
83 | ||
84 | static int dma_proc_read_mem_type(char *buf, char **start, off_t offset, | |
85 | int count, int *eof, void *data) | |
86 | { | |
87 | int len = 0; | |
88 | ||
89 | len += sprintf(buf + len, "dma_map_mem statistics\n"); | |
90 | len += | |
91 | sprintf(buf + len, "coherent: %d\n", | |
92 | atomic_read(&gDmaStatMemTypeCoherent)); | |
93 | len += | |
94 | sprintf(buf + len, "kmalloc: %d\n", | |
95 | atomic_read(&gDmaStatMemTypeKmalloc)); | |
96 | len += | |
97 | sprintf(buf + len, "vmalloc: %d\n", | |
98 | atomic_read(&gDmaStatMemTypeVmalloc)); | |
99 | len += | |
100 | sprintf(buf + len, "user: %d\n", | |
101 | atomic_read(&gDmaStatMemTypeUser)); | |
102 | ||
103 | return len; | |
104 | } | |
105 | ||
106 | /****************************************************************************/ | |
107 | /** | |
108 | * Displays information for /proc/dma/channels | |
109 | */ | |
110 | /****************************************************************************/ | |
111 | ||
112 | static int dma_proc_read_channels(char *buf, char **start, off_t offset, | |
113 | int count, int *eof, void *data) | |
114 | { | |
115 | int controllerIdx; | |
116 | int channelIdx; | |
117 | int limit = count - 200; | |
118 | int len = 0; | |
119 | DMA_Channel_t *channel; | |
120 | ||
121 | if (down_interruptible(&gDMA.lock) < 0) { | |
122 | return -ERESTARTSYS; | |
123 | } | |
124 | ||
125 | for (controllerIdx = 0; controllerIdx < DMA_NUM_CONTROLLERS; | |
126 | controllerIdx++) { | |
127 | for (channelIdx = 0; channelIdx < DMA_NUM_CHANNELS; | |
128 | channelIdx++) { | |
129 | if (len >= limit) { | |
130 | break; | |
131 | } | |
132 | ||
133 | channel = | |
134 | &gDMA.controller[controllerIdx].channel[channelIdx]; | |
135 | ||
136 | len += | |
137 | sprintf(buf + len, "%d:%d ", controllerIdx, | |
138 | channelIdx); | |
139 | ||
140 | if ((channel->flags & DMA_CHANNEL_FLAG_IS_DEDICATED) != | |
141 | 0) { | |
142 | len += | |
143 | sprintf(buf + len, "Dedicated for %s ", | |
144 | DMA_gDeviceAttribute[channel-> | |
145 | devType].name); | |
146 | } else { | |
147 | len += sprintf(buf + len, "Shared "); | |
148 | } | |
149 | ||
150 | if ((channel->flags & DMA_CHANNEL_FLAG_NO_ISR) != 0) { | |
151 | len += sprintf(buf + len, "No ISR "); | |
152 | } | |
153 | ||
154 | if ((channel->flags & DMA_CHANNEL_FLAG_LARGE_FIFO) != 0) { | |
155 | len += sprintf(buf + len, "Fifo: 128 "); | |
156 | } else { | |
157 | len += sprintf(buf + len, "Fifo: 64 "); | |
158 | } | |
159 | ||
160 | if ((channel->flags & DMA_CHANNEL_FLAG_IN_USE) != 0) { | |
161 | len += | |
162 | sprintf(buf + len, "InUse by %s", | |
163 | DMA_gDeviceAttribute[channel-> | |
164 | devType].name); | |
165 | #if (DMA_DEBUG_TRACK_RESERVATION) | |
166 | len += | |
167 | sprintf(buf + len, " (%s:%d)", | |
168 | channel->fileName, | |
169 | channel->lineNum); | |
170 | #endif | |
171 | } else { | |
172 | len += sprintf(buf + len, "Avail "); | |
173 | } | |
174 | ||
175 | if (channel->lastDevType != DMA_DEVICE_NONE) { | |
176 | len += | |
177 | sprintf(buf + len, "Last use: %s ", | |
178 | DMA_gDeviceAttribute[channel-> | |
179 | lastDevType]. | |
180 | name); | |
181 | } | |
182 | ||
183 | len += sprintf(buf + len, "\n"); | |
184 | } | |
185 | } | |
186 | up(&gDMA.lock); | |
187 | *eof = 1; | |
188 | ||
189 | return len; | |
190 | } | |
191 | ||
192 | /****************************************************************************/ | |
193 | /** | |
194 | * Displays information for /proc/dma/devices | |
195 | */ | |
196 | /****************************************************************************/ | |
197 | ||
198 | static int dma_proc_read_devices(char *buf, char **start, off_t offset, | |
199 | int count, int *eof, void *data) | |
200 | { | |
201 | int limit = count - 200; | |
202 | int len = 0; | |
203 | int devIdx; | |
204 | ||
205 | if (down_interruptible(&gDMA.lock) < 0) { | |
206 | return -ERESTARTSYS; | |
207 | } | |
208 | ||
209 | for (devIdx = 0; devIdx < DMA_NUM_DEVICE_ENTRIES; devIdx++) { | |
210 | DMA_DeviceAttribute_t *devAttr = &DMA_gDeviceAttribute[devIdx]; | |
211 | ||
212 | if (devAttr->name == NULL) { | |
213 | continue; | |
214 | } | |
215 | ||
216 | if (len >= limit) { | |
217 | break; | |
218 | } | |
219 | ||
220 | len += sprintf(buf + len, "%-12s ", devAttr->name); | |
221 | ||
222 | if ((devAttr->flags & DMA_DEVICE_FLAG_IS_DEDICATED) != 0) { | |
223 | len += | |
224 | sprintf(buf + len, "Dedicated %d:%d ", | |
225 | devAttr->dedicatedController, | |
226 | devAttr->dedicatedChannel); | |
227 | } else { | |
228 | len += sprintf(buf + len, "Shared DMA:"); | |
229 | if ((devAttr->flags & DMA_DEVICE_FLAG_ON_DMA0) != 0) { | |
230 | len += sprintf(buf + len, "0"); | |
231 | } | |
232 | if ((devAttr->flags & DMA_DEVICE_FLAG_ON_DMA1) != 0) { | |
233 | len += sprintf(buf + len, "1"); | |
234 | } | |
235 | len += sprintf(buf + len, " "); | |
236 | } | |
237 | if ((devAttr->flags & DMA_DEVICE_FLAG_NO_ISR) != 0) { | |
238 | len += sprintf(buf + len, "NoISR "); | |
239 | } | |
240 | if ((devAttr->flags & DMA_DEVICE_FLAG_ALLOW_LARGE_FIFO) != 0) { | |
241 | len += sprintf(buf + len, "Allow-128 "); | |
242 | } | |
243 | ||
244 | len += | |
245 | sprintf(buf + len, | |
246 | "Xfer #: %Lu Ticks: %Lu Bytes: %Lu DescLen: %u\n", | |
247 | devAttr->numTransfers, devAttr->transferTicks, | |
248 | devAttr->transferBytes, | |
249 | devAttr->ring.bytesAllocated); | |
250 | ||
251 | } | |
252 | ||
253 | up(&gDMA.lock); | |
254 | *eof = 1; | |
255 | ||
256 | return len; | |
257 | } | |
258 | ||
259 | /****************************************************************************/ | |
260 | /** | |
261 | * Determines if a DMA_Device_t is "valid". | |
262 | * | |
263 | * @return | |
264 | * TRUE - dma device is valid | |
265 | * FALSE - dma device isn't valid | |
266 | */ | |
267 | /****************************************************************************/ | |
268 | ||
269 | static inline int IsDeviceValid(DMA_Device_t device) | |
270 | { | |
271 | return (device >= 0) && (device < DMA_NUM_DEVICE_ENTRIES); | |
272 | } | |
273 | ||
274 | /****************************************************************************/ | |
275 | /** | |
276 | * Translates a DMA handle into a pointer to a channel. | |
277 | * | |
278 | * @return | |
279 | * non-NULL - pointer to DMA_Channel_t | |
280 | * NULL - DMA Handle was invalid | |
281 | */ | |
282 | /****************************************************************************/ | |
283 | ||
284 | static inline DMA_Channel_t *HandleToChannel(DMA_Handle_t handle) | |
285 | { | |
286 | int controllerIdx; | |
287 | int channelIdx; | |
288 | ||
289 | controllerIdx = CONTROLLER_FROM_HANDLE(handle); | |
290 | channelIdx = CHANNEL_FROM_HANDLE(handle); | |
291 | ||
292 | if ((controllerIdx > DMA_NUM_CONTROLLERS) | |
293 | || (channelIdx > DMA_NUM_CHANNELS)) { | |
294 | return NULL; | |
295 | } | |
296 | return &gDMA.controller[controllerIdx].channel[channelIdx]; | |
297 | } | |
298 | ||
299 | /****************************************************************************/ | |
300 | /** | |
301 | * Interrupt handler which is called to process DMA interrupts. | |
302 | */ | |
303 | /****************************************************************************/ | |
304 | ||
305 | static irqreturn_t dma_interrupt_handler(int irq, void *dev_id) | |
306 | { | |
307 | DMA_Channel_t *channel; | |
308 | DMA_DeviceAttribute_t *devAttr; | |
309 | int irqStatus; | |
310 | ||
311 | channel = (DMA_Channel_t *) dev_id; | |
312 | ||
313 | /* Figure out why we were called, and knock down the interrupt */ | |
314 | ||
315 | irqStatus = dmacHw_getInterruptStatus(channel->dmacHwHandle); | |
316 | dmacHw_clearInterrupt(channel->dmacHwHandle); | |
317 | ||
318 | if ((channel->devType < 0) | |
319 | || (channel->devType > DMA_NUM_DEVICE_ENTRIES)) { | |
320 | printk(KERN_ERR "dma_interrupt_handler: Invalid devType: %d\n", | |
321 | channel->devType); | |
322 | return IRQ_NONE; | |
323 | } | |
324 | devAttr = &DMA_gDeviceAttribute[channel->devType]; | |
325 | ||
326 | /* Update stats */ | |
327 | ||
328 | if ((irqStatus & dmacHw_INTERRUPT_STATUS_TRANS) != 0) { | |
329 | devAttr->transferTicks += | |
330 | (timer_get_tick_count() - devAttr->transferStartTime); | |
331 | } | |
332 | ||
333 | if ((irqStatus & dmacHw_INTERRUPT_STATUS_ERROR) != 0) { | |
334 | printk(KERN_ERR | |
335 | "dma_interrupt_handler: devType :%d DMA error (%s)\n", | |
336 | channel->devType, devAttr->name); | |
337 | } else { | |
338 | devAttr->numTransfers++; | |
339 | devAttr->transferBytes += devAttr->numBytes; | |
340 | } | |
341 | ||
342 | /* Call any installed handler */ | |
343 | ||
344 | if (devAttr->devHandler != NULL) { | |
345 | devAttr->devHandler(channel->devType, irqStatus, | |
346 | devAttr->userData); | |
347 | } | |
348 | ||
349 | return IRQ_HANDLED; | |
350 | } | |
351 | ||
352 | /****************************************************************************/ | |
353 | /** | |
354 | * Allocates memory to hold a descriptor ring. The descriptor ring then | |
355 | * needs to be populated by making one or more calls to | |
356 | * dna_add_descriptors. | |
357 | * | |
358 | * The returned descriptor ring will be automatically initialized. | |
359 | * | |
360 | * @return | |
361 | * 0 Descriptor ring was allocated successfully | |
362 | * -EINVAL Invalid parameters passed in | |
363 | * -ENOMEM Unable to allocate memory for the desired number of descriptors. | |
364 | */ | |
365 | /****************************************************************************/ | |
366 | ||
367 | int dma_alloc_descriptor_ring(DMA_DescriptorRing_t *ring, /* Descriptor ring to populate */ | |
368 | int numDescriptors /* Number of descriptors that need to be allocated. */ | |
369 | ) { | |
370 | size_t bytesToAlloc = dmacHw_descriptorLen(numDescriptors); | |
371 | ||
372 | if ((ring == NULL) || (numDescriptors <= 0)) { | |
373 | return -EINVAL; | |
374 | } | |
375 | ||
376 | ring->physAddr = 0; | |
377 | ring->descriptorsAllocated = 0; | |
378 | ring->bytesAllocated = 0; | |
379 | ||
380 | ring->virtAddr = dma_alloc_writecombine(NULL, | |
381 | bytesToAlloc, | |
382 | &ring->physAddr, | |
383 | GFP_KERNEL); | |
384 | if (ring->virtAddr == NULL) { | |
385 | return -ENOMEM; | |
386 | } | |
387 | ||
388 | ring->bytesAllocated = bytesToAlloc; | |
389 | ring->descriptorsAllocated = numDescriptors; | |
390 | ||
391 | return dma_init_descriptor_ring(ring, numDescriptors); | |
392 | } | |
393 | ||
394 | EXPORT_SYMBOL(dma_alloc_descriptor_ring); | |
395 | ||
396 | /****************************************************************************/ | |
397 | /** | |
398 | * Releases the memory which was previously allocated for a descriptor ring. | |
399 | */ | |
400 | /****************************************************************************/ | |
401 | ||
402 | void dma_free_descriptor_ring(DMA_DescriptorRing_t *ring /* Descriptor to release */ | |
403 | ) { | |
404 | if (ring->virtAddr != NULL) { | |
405 | dma_free_writecombine(NULL, | |
406 | ring->bytesAllocated, | |
407 | ring->virtAddr, ring->physAddr); | |
408 | } | |
409 | ||
410 | ring->bytesAllocated = 0; | |
411 | ring->descriptorsAllocated = 0; | |
412 | ring->virtAddr = NULL; | |
413 | ring->physAddr = 0; | |
414 | } | |
415 | ||
416 | EXPORT_SYMBOL(dma_free_descriptor_ring); | |
417 | ||
418 | /****************************************************************************/ | |
419 | /** | |
420 | * Initializes a descriptor ring, so that descriptors can be added to it. | |
421 | * Once a descriptor ring has been allocated, it may be reinitialized for | |
422 | * use with additional/different regions of memory. | |
423 | * | |
424 | * Note that if 7 descriptors are allocated, it's perfectly acceptable to | |
425 | * initialize the ring with a smaller number of descriptors. The amount | |
426 | * of memory allocated for the descriptor ring will not be reduced, and | |
427 | * the descriptor ring may be reinitialized later | |
428 | * | |
429 | * @return | |
430 | * 0 Descriptor ring was initialized successfully | |
431 | * -ENOMEM The descriptor which was passed in has insufficient space | |
432 | * to hold the desired number of descriptors. | |
433 | */ | |
434 | /****************************************************************************/ | |
435 | ||
436 | int dma_init_descriptor_ring(DMA_DescriptorRing_t *ring, /* Descriptor ring to initialize */ | |
437 | int numDescriptors /* Number of descriptors to initialize. */ | |
438 | ) { | |
439 | if (ring->virtAddr == NULL) { | |
440 | return -EINVAL; | |
441 | } | |
442 | if (dmacHw_initDescriptor(ring->virtAddr, | |
443 | ring->physAddr, | |
444 | ring->bytesAllocated, numDescriptors) < 0) { | |
445 | printk(KERN_ERR | |
446 | "dma_init_descriptor_ring: dmacHw_initDescriptor failed\n"); | |
447 | return -ENOMEM; | |
448 | } | |
449 | ||
450 | return 0; | |
451 | } | |
452 | ||
453 | EXPORT_SYMBOL(dma_init_descriptor_ring); | |
454 | ||
455 | /****************************************************************************/ | |
456 | /** | |
457 | * Determines the number of descriptors which would be required for a | |
458 | * transfer of the indicated memory region. | |
459 | * | |
460 | * This function also needs to know which DMA device this transfer will | |
461 | * be destined for, so that the appropriate DMA configuration can be retrieved. | |
462 | * DMA parameters such as transfer width, and whether this is a memory-to-memory | |
463 | * or memory-to-peripheral, etc can all affect the actual number of descriptors | |
464 | * required. | |
465 | * | |
466 | * @return | |
467 | * > 0 Returns the number of descriptors required for the indicated transfer | |
468 | * -ENODEV - Device handed in is invalid. | |
469 | * -EINVAL Invalid parameters | |
470 | * -ENOMEM Memory exhausted | |
471 | */ | |
472 | /****************************************************************************/ | |
473 | ||
474 | int dma_calculate_descriptor_count(DMA_Device_t device, /* DMA Device that this will be associated with */ | |
475 | dma_addr_t srcData, /* Place to get data to write to device */ | |
476 | dma_addr_t dstData, /* Pointer to device data address */ | |
477 | size_t numBytes /* Number of bytes to transfer to the device */ | |
478 | ) { | |
479 | int numDescriptors; | |
480 | DMA_DeviceAttribute_t *devAttr; | |
481 | ||
482 | if (!IsDeviceValid(device)) { | |
483 | return -ENODEV; | |
484 | } | |
485 | devAttr = &DMA_gDeviceAttribute[device]; | |
486 | ||
487 | numDescriptors = dmacHw_calculateDescriptorCount(&devAttr->config, | |
488 | (void *)srcData, | |
489 | (void *)dstData, | |
490 | numBytes); | |
491 | if (numDescriptors < 0) { | |
492 | printk(KERN_ERR | |
493 | "dma_calculate_descriptor_count: dmacHw_calculateDescriptorCount failed\n"); | |
494 | return -EINVAL; | |
495 | } | |
496 | ||
497 | return numDescriptors; | |
498 | } | |
499 | ||
500 | EXPORT_SYMBOL(dma_calculate_descriptor_count); | |
501 | ||
502 | /****************************************************************************/ | |
503 | /** | |
504 | * Adds a region of memory to the descriptor ring. Note that it may take | |
505 | * multiple descriptors for each region of memory. It is the callers | |
506 | * responsibility to allocate a sufficiently large descriptor ring. | |
507 | * | |
508 | * @return | |
509 | * 0 Descriptors were added successfully | |
510 | * -ENODEV Device handed in is invalid. | |
511 | * -EINVAL Invalid parameters | |
512 | * -ENOMEM Memory exhausted | |
513 | */ | |
514 | /****************************************************************************/ | |
515 | ||
516 | int dma_add_descriptors(DMA_DescriptorRing_t *ring, /* Descriptor ring to add descriptors to */ | |
517 | DMA_Device_t device, /* DMA Device that descriptors are for */ | |
518 | dma_addr_t srcData, /* Place to get data (memory or device) */ | |
519 | dma_addr_t dstData, /* Place to put data (memory or device) */ | |
520 | size_t numBytes /* Number of bytes to transfer to the device */ | |
521 | ) { | |
522 | int rc; | |
523 | DMA_DeviceAttribute_t *devAttr; | |
524 | ||
525 | if (!IsDeviceValid(device)) { | |
526 | return -ENODEV; | |
527 | } | |
528 | devAttr = &DMA_gDeviceAttribute[device]; | |
529 | ||
530 | rc = dmacHw_setDataDescriptor(&devAttr->config, | |
531 | ring->virtAddr, | |
532 | (void *)srcData, | |
533 | (void *)dstData, numBytes); | |
534 | if (rc < 0) { | |
535 | printk(KERN_ERR | |
536 | "dma_add_descriptors: dmacHw_setDataDescriptor failed with code: %d\n", | |
537 | rc); | |
538 | return -ENOMEM; | |
539 | } | |
540 | ||
541 | return 0; | |
542 | } | |
543 | ||
544 | EXPORT_SYMBOL(dma_add_descriptors); | |
545 | ||
546 | /****************************************************************************/ | |
547 | /** | |
548 | * Sets the descriptor ring associated with a device. | |
549 | * | |
550 | * Once set, the descriptor ring will be associated with the device, even | |
551 | * across channel request/free calls. Passing in a NULL descriptor ring | |
552 | * will release any descriptor ring currently associated with the device. | |
553 | * | |
554 | * Note: If you call dma_transfer, or one of the other dma_alloc_ functions | |
555 | * the descriptor ring may be released and reallocated. | |
556 | * | |
557 | * Note: This function will release the descriptor memory for any current | |
558 | * descriptor ring associated with this device. | |
559 | * | |
560 | * @return | |
561 | * 0 Descriptors were added successfully | |
562 | * -ENODEV Device handed in is invalid. | |
563 | */ | |
564 | /****************************************************************************/ | |
565 | ||
566 | int dma_set_device_descriptor_ring(DMA_Device_t device, /* Device to update the descriptor ring for. */ | |
567 | DMA_DescriptorRing_t *ring /* Descriptor ring to add descriptors to */ | |
568 | ) { | |
569 | DMA_DeviceAttribute_t *devAttr; | |
570 | ||
571 | if (!IsDeviceValid(device)) { | |
572 | return -ENODEV; | |
573 | } | |
574 | devAttr = &DMA_gDeviceAttribute[device]; | |
575 | ||
576 | /* Free the previously allocated descriptor ring */ | |
577 | ||
578 | dma_free_descriptor_ring(&devAttr->ring); | |
579 | ||
580 | if (ring != NULL) { | |
581 | /* Copy in the new one */ | |
582 | ||
583 | devAttr->ring = *ring; | |
584 | } | |
585 | ||
586 | /* Set things up so that if dma_transfer is called then this descriptor */ | |
587 | /* ring will get freed. */ | |
588 | ||
589 | devAttr->prevSrcData = 0; | |
590 | devAttr->prevDstData = 0; | |
591 | devAttr->prevNumBytes = 0; | |
592 | ||
593 | return 0; | |
594 | } | |
595 | ||
596 | EXPORT_SYMBOL(dma_set_device_descriptor_ring); | |
597 | ||
598 | /****************************************************************************/ | |
599 | /** | |
600 | * Retrieves the descriptor ring associated with a device. | |
601 | * | |
602 | * @return | |
603 | * 0 Descriptors were added successfully | |
604 | * -ENODEV Device handed in is invalid. | |
605 | */ | |
606 | /****************************************************************************/ | |
607 | ||
608 | int dma_get_device_descriptor_ring(DMA_Device_t device, /* Device to retrieve the descriptor ring for. */ | |
609 | DMA_DescriptorRing_t *ring /* Place to store retrieved ring */ | |
610 | ) { | |
611 | DMA_DeviceAttribute_t *devAttr; | |
612 | ||
613 | memset(ring, 0, sizeof(*ring)); | |
614 | ||
615 | if (!IsDeviceValid(device)) { | |
616 | return -ENODEV; | |
617 | } | |
618 | devAttr = &DMA_gDeviceAttribute[device]; | |
619 | ||
620 | *ring = devAttr->ring; | |
621 | ||
622 | return 0; | |
623 | } | |
624 | ||
625 | EXPORT_SYMBOL(dma_get_device_descriptor_ring); | |
626 | ||
627 | /****************************************************************************/ | |
628 | /** | |
629 | * Configures a DMA channel. | |
630 | * | |
631 | * @return | |
632 | * >= 0 - Initialization was successfull. | |
633 | * | |
634 | * -EBUSY - Device is currently being used. | |
635 | * -ENODEV - Device handed in is invalid. | |
636 | */ | |
637 | /****************************************************************************/ | |
638 | ||
639 | static int ConfigChannel(DMA_Handle_t handle) | |
640 | { | |
641 | DMA_Channel_t *channel; | |
642 | DMA_DeviceAttribute_t *devAttr; | |
643 | int controllerIdx; | |
644 | ||
645 | channel = HandleToChannel(handle); | |
646 | if (channel == NULL) { | |
647 | return -ENODEV; | |
648 | } | |
649 | devAttr = &DMA_gDeviceAttribute[channel->devType]; | |
650 | controllerIdx = CONTROLLER_FROM_HANDLE(handle); | |
651 | ||
652 | if ((devAttr->flags & DMA_DEVICE_FLAG_PORT_PER_DMAC) != 0) { | |
653 | if (devAttr->config.transferType == | |
654 | dmacHw_TRANSFER_TYPE_MEM_TO_PERIPHERAL) { | |
655 | devAttr->config.dstPeripheralPort = | |
656 | devAttr->dmacPort[controllerIdx]; | |
657 | } else if (devAttr->config.transferType == | |
658 | dmacHw_TRANSFER_TYPE_PERIPHERAL_TO_MEM) { | |
659 | devAttr->config.srcPeripheralPort = | |
660 | devAttr->dmacPort[controllerIdx]; | |
661 | } | |
662 | } | |
663 | ||
664 | if (dmacHw_configChannel(channel->dmacHwHandle, &devAttr->config) != 0) { | |
665 | printk(KERN_ERR "ConfigChannel: dmacHw_configChannel failed\n"); | |
666 | return -EIO; | |
667 | } | |
668 | ||
669 | return 0; | |
670 | } | |
671 | ||
672 | /****************************************************************************/ | |
673 | /** | |
b595076a | 674 | * Initializes all of the data structures associated with the DMA. |
859277f7 LC |
675 | * @return |
676 | * >= 0 - Initialization was successfull. | |
677 | * | |
678 | * -EBUSY - Device is currently being used. | |
679 | * -ENODEV - Device handed in is invalid. | |
680 | */ | |
681 | /****************************************************************************/ | |
682 | ||
683 | int dma_init(void) | |
684 | { | |
685 | int rc = 0; | |
686 | int controllerIdx; | |
687 | int channelIdx; | |
688 | DMA_Device_t devIdx; | |
689 | DMA_Channel_t *channel; | |
690 | DMA_Handle_t dedicatedHandle; | |
691 | ||
692 | memset(&gDMA, 0, sizeof(gDMA)); | |
693 | ||
5356d948 | 694 | sema_init(&gDMA.lock, 0); |
859277f7 LC |
695 | init_waitqueue_head(&gDMA.freeChannelQ); |
696 | ||
697 | /* Initialize the Hardware */ | |
698 | ||
699 | dmacHw_initDma(); | |
700 | ||
701 | /* Start off by marking all of the DMA channels as shared. */ | |
702 | ||
703 | for (controllerIdx = 0; controllerIdx < DMA_NUM_CONTROLLERS; | |
704 | controllerIdx++) { | |
705 | for (channelIdx = 0; channelIdx < DMA_NUM_CHANNELS; | |
706 | channelIdx++) { | |
707 | channel = | |
708 | &gDMA.controller[controllerIdx].channel[channelIdx]; | |
709 | ||
710 | channel->flags = 0; | |
711 | channel->devType = DMA_DEVICE_NONE; | |
712 | channel->lastDevType = DMA_DEVICE_NONE; | |
713 | ||
714 | #if (DMA_DEBUG_TRACK_RESERVATION) | |
715 | channel->fileName = ""; | |
716 | channel->lineNum = 0; | |
717 | #endif | |
718 | ||
719 | channel->dmacHwHandle = | |
720 | dmacHw_getChannelHandle(dmacHw_MAKE_CHANNEL_ID | |
721 | (controllerIdx, | |
722 | channelIdx)); | |
723 | dmacHw_initChannel(channel->dmacHwHandle); | |
724 | } | |
725 | } | |
726 | ||
727 | /* Record any special attributes that channels may have */ | |
728 | ||
729 | gDMA.controller[0].channel[0].flags |= DMA_CHANNEL_FLAG_LARGE_FIFO; | |
730 | gDMA.controller[0].channel[1].flags |= DMA_CHANNEL_FLAG_LARGE_FIFO; | |
731 | gDMA.controller[1].channel[0].flags |= DMA_CHANNEL_FLAG_LARGE_FIFO; | |
732 | gDMA.controller[1].channel[1].flags |= DMA_CHANNEL_FLAG_LARGE_FIFO; | |
733 | ||
734 | /* Now walk through and record the dedicated channels. */ | |
735 | ||
736 | for (devIdx = 0; devIdx < DMA_NUM_DEVICE_ENTRIES; devIdx++) { | |
737 | DMA_DeviceAttribute_t *devAttr = &DMA_gDeviceAttribute[devIdx]; | |
738 | ||
739 | if (((devAttr->flags & DMA_DEVICE_FLAG_NO_ISR) != 0) | |
740 | && ((devAttr->flags & DMA_DEVICE_FLAG_IS_DEDICATED) == 0)) { | |
741 | printk(KERN_ERR | |
742 | "DMA Device: %s Can only request NO_ISR for dedicated devices\n", | |
743 | devAttr->name); | |
744 | rc = -EINVAL; | |
745 | goto out; | |
746 | } | |
747 | ||
748 | if ((devAttr->flags & DMA_DEVICE_FLAG_IS_DEDICATED) != 0) { | |
749 | /* This is a dedicated device. Mark the channel as being reserved. */ | |
750 | ||
751 | if (devAttr->dedicatedController >= DMA_NUM_CONTROLLERS) { | |
752 | printk(KERN_ERR | |
753 | "DMA Device: %s DMA Controller %d is out of range\n", | |
754 | devAttr->name, | |
755 | devAttr->dedicatedController); | |
756 | rc = -EINVAL; | |
757 | goto out; | |
758 | } | |
759 | ||
760 | if (devAttr->dedicatedChannel >= DMA_NUM_CHANNELS) { | |
761 | printk(KERN_ERR | |
762 | "DMA Device: %s DMA Channel %d is out of range\n", | |
763 | devAttr->name, | |
764 | devAttr->dedicatedChannel); | |
765 | rc = -EINVAL; | |
766 | goto out; | |
767 | } | |
768 | ||
769 | dedicatedHandle = | |
770 | MAKE_HANDLE(devAttr->dedicatedController, | |
771 | devAttr->dedicatedChannel); | |
772 | channel = HandleToChannel(dedicatedHandle); | |
773 | ||
774 | if ((channel->flags & DMA_CHANNEL_FLAG_IS_DEDICATED) != | |
775 | 0) { | |
776 | printk | |
777 | ("DMA Device: %s attempting to use same DMA Controller:Channel (%d:%d) as %s\n", | |
778 | devAttr->name, | |
779 | devAttr->dedicatedController, | |
780 | devAttr->dedicatedChannel, | |
781 | DMA_gDeviceAttribute[channel->devType]. | |
782 | name); | |
783 | rc = -EBUSY; | |
784 | goto out; | |
785 | } | |
786 | ||
787 | channel->flags |= DMA_CHANNEL_FLAG_IS_DEDICATED; | |
788 | channel->devType = devIdx; | |
789 | ||
790 | if (devAttr->flags & DMA_DEVICE_FLAG_NO_ISR) { | |
791 | channel->flags |= DMA_CHANNEL_FLAG_NO_ISR; | |
792 | } | |
793 | ||
794 | /* For dedicated channels, we can go ahead and configure the DMA channel now */ | |
795 | /* as well. */ | |
796 | ||
797 | ConfigChannel(dedicatedHandle); | |
798 | } | |
799 | } | |
800 | ||
801 | /* Go through and register the interrupt handlers */ | |
802 | ||
803 | for (controllerIdx = 0; controllerIdx < DMA_NUM_CONTROLLERS; | |
804 | controllerIdx++) { | |
805 | for (channelIdx = 0; channelIdx < DMA_NUM_CHANNELS; | |
806 | channelIdx++) { | |
807 | channel = | |
808 | &gDMA.controller[controllerIdx].channel[channelIdx]; | |
809 | ||
810 | if ((channel->flags & DMA_CHANNEL_FLAG_NO_ISR) == 0) { | |
811 | snprintf(channel->name, sizeof(channel->name), | |
812 | "dma %d:%d %s", controllerIdx, | |
813 | channelIdx, | |
814 | channel->devType == | |
815 | DMA_DEVICE_NONE ? "" : | |
816 | DMA_gDeviceAttribute[channel->devType]. | |
817 | name); | |
818 | ||
819 | rc = | |
820 | request_irq(IRQ_DMA0C0 + | |
821 | (controllerIdx * | |
822 | DMA_NUM_CHANNELS) + | |
823 | channelIdx, | |
824 | dma_interrupt_handler, | |
825 | IRQF_DISABLED, channel->name, | |
826 | channel); | |
827 | if (rc != 0) { | |
828 | printk(KERN_ERR | |
829 | "request_irq for IRQ_DMA%dC%d failed\n", | |
830 | controllerIdx, channelIdx); | |
831 | } | |
832 | } | |
833 | } | |
834 | } | |
835 | ||
836 | /* Create /proc/dma/channels and /proc/dma/devices */ | |
837 | ||
838 | gDmaDir = create_proc_entry("dma", S_IFDIR | S_IRUGO | S_IXUGO, NULL); | |
839 | ||
840 | if (gDmaDir == NULL) { | |
841 | printk(KERN_ERR "Unable to create /proc/dma\n"); | |
842 | } else { | |
843 | create_proc_read_entry("channels", 0, gDmaDir, | |
844 | dma_proc_read_channels, NULL); | |
845 | create_proc_read_entry("devices", 0, gDmaDir, | |
846 | dma_proc_read_devices, NULL); | |
847 | create_proc_read_entry("mem-type", 0, gDmaDir, | |
848 | dma_proc_read_mem_type, NULL); | |
849 | } | |
850 | ||
851 | out: | |
852 | ||
853 | up(&gDMA.lock); | |
854 | ||
855 | return rc; | |
856 | } | |
857 | ||
858 | /****************************************************************************/ | |
859 | /** | |
860 | * Reserves a channel for use with @a dev. If the device is setup to use | |
861 | * a shared channel, then this function will block until a free channel | |
862 | * becomes available. | |
863 | * | |
864 | * @return | |
865 | * >= 0 - A valid DMA Handle. | |
866 | * -EBUSY - Device is currently being used. | |
867 | * -ENODEV - Device handed in is invalid. | |
868 | */ | |
869 | /****************************************************************************/ | |
870 | ||
871 | #if (DMA_DEBUG_TRACK_RESERVATION) | |
872 | DMA_Handle_t dma_request_channel_dbg | |
873 | (DMA_Device_t dev, const char *fileName, int lineNum) | |
874 | #else | |
875 | DMA_Handle_t dma_request_channel(DMA_Device_t dev) | |
876 | #endif | |
877 | { | |
878 | DMA_Handle_t handle; | |
879 | DMA_DeviceAttribute_t *devAttr; | |
880 | DMA_Channel_t *channel; | |
881 | int controllerIdx; | |
882 | int controllerIdx2; | |
883 | int channelIdx; | |
884 | ||
885 | if (down_interruptible(&gDMA.lock) < 0) { | |
886 | return -ERESTARTSYS; | |
887 | } | |
888 | ||
889 | if ((dev < 0) || (dev >= DMA_NUM_DEVICE_ENTRIES)) { | |
890 | handle = -ENODEV; | |
891 | goto out; | |
892 | } | |
893 | devAttr = &DMA_gDeviceAttribute[dev]; | |
894 | ||
895 | #if (DMA_DEBUG_TRACK_RESERVATION) | |
896 | { | |
897 | char *s; | |
898 | ||
899 | s = strrchr(fileName, '/'); | |
900 | if (s != NULL) { | |
901 | fileName = s + 1; | |
902 | } | |
903 | } | |
904 | #endif | |
905 | if ((devAttr->flags & DMA_DEVICE_FLAG_IN_USE) != 0) { | |
906 | /* This device has already been requested and not been freed */ | |
907 | ||
908 | printk(KERN_ERR "%s: device %s is already requested\n", | |
909 | __func__, devAttr->name); | |
910 | handle = -EBUSY; | |
911 | goto out; | |
912 | } | |
913 | ||
914 | if ((devAttr->flags & DMA_DEVICE_FLAG_IS_DEDICATED) != 0) { | |
915 | /* This device has a dedicated channel. */ | |
916 | ||
917 | channel = | |
918 | &gDMA.controller[devAttr->dedicatedController]. | |
919 | channel[devAttr->dedicatedChannel]; | |
920 | if ((channel->flags & DMA_CHANNEL_FLAG_IN_USE) != 0) { | |
921 | handle = -EBUSY; | |
922 | goto out; | |
923 | } | |
924 | ||
925 | channel->flags |= DMA_CHANNEL_FLAG_IN_USE; | |
926 | devAttr->flags |= DMA_DEVICE_FLAG_IN_USE; | |
927 | ||
928 | #if (DMA_DEBUG_TRACK_RESERVATION) | |
929 | channel->fileName = fileName; | |
930 | channel->lineNum = lineNum; | |
931 | #endif | |
932 | handle = | |
933 | MAKE_HANDLE(devAttr->dedicatedController, | |
934 | devAttr->dedicatedChannel); | |
935 | goto out; | |
936 | } | |
937 | ||
938 | /* This device needs to use one of the shared channels. */ | |
939 | ||
940 | handle = DMA_INVALID_HANDLE; | |
941 | while (handle == DMA_INVALID_HANDLE) { | |
942 | /* Scan through the shared channels and see if one is available */ | |
943 | ||
944 | for (controllerIdx2 = 0; controllerIdx2 < DMA_NUM_CONTROLLERS; | |
945 | controllerIdx2++) { | |
946 | /* Check to see if we should try on controller 1 first. */ | |
947 | ||
948 | controllerIdx = controllerIdx2; | |
949 | if ((devAttr-> | |
950 | flags & DMA_DEVICE_FLAG_ALLOC_DMA1_FIRST) != 0) { | |
951 | controllerIdx = 1 - controllerIdx; | |
952 | } | |
953 | ||
954 | /* See if the device is available on the controller being tested */ | |
955 | ||
956 | if ((devAttr-> | |
957 | flags & (DMA_DEVICE_FLAG_ON_DMA0 << controllerIdx)) | |
958 | != 0) { | |
959 | for (channelIdx = 0; | |
960 | channelIdx < DMA_NUM_CHANNELS; | |
961 | channelIdx++) { | |
962 | channel = | |
963 | &gDMA.controller[controllerIdx]. | |
964 | channel[channelIdx]; | |
965 | ||
966 | if (((channel-> | |
967 | flags & | |
968 | DMA_CHANNEL_FLAG_IS_DEDICATED) == | |
969 | 0) | |
970 | && | |
971 | ((channel-> | |
972 | flags & DMA_CHANNEL_FLAG_IN_USE) | |
973 | == 0)) { | |
974 | if (((channel-> | |
975 | flags & | |
976 | DMA_CHANNEL_FLAG_LARGE_FIFO) | |
977 | != 0) | |
978 | && | |
979 | ((devAttr-> | |
980 | flags & | |
981 | DMA_DEVICE_FLAG_ALLOW_LARGE_FIFO) | |
982 | == 0)) { | |
983 | /* This channel is a large fifo - don't tie it up */ | |
984 | /* with devices that we don't want using it. */ | |
985 | ||
986 | continue; | |
987 | } | |
988 | ||
989 | channel->flags |= | |
990 | DMA_CHANNEL_FLAG_IN_USE; | |
991 | channel->devType = dev; | |
992 | devAttr->flags |= | |
993 | DMA_DEVICE_FLAG_IN_USE; | |
994 | ||
995 | #if (DMA_DEBUG_TRACK_RESERVATION) | |
996 | channel->fileName = fileName; | |
997 | channel->lineNum = lineNum; | |
998 | #endif | |
999 | handle = | |
1000 | MAKE_HANDLE(controllerIdx, | |
1001 | channelIdx); | |
1002 | ||
1003 | /* Now that we've reserved the channel - we can go ahead and configure it */ | |
1004 | ||
1005 | if (ConfigChannel(handle) != 0) { | |
1006 | handle = -EIO; | |
1007 | printk(KERN_ERR | |
1008 | "dma_request_channel: ConfigChannel failed\n"); | |
1009 | } | |
1010 | goto out; | |
1011 | } | |
1012 | } | |
1013 | } | |
1014 | } | |
1015 | ||
1016 | /* No channels are currently available. Let's wait for one to free up. */ | |
1017 | ||
1018 | { | |
1019 | DEFINE_WAIT(wait); | |
1020 | ||
1021 | prepare_to_wait(&gDMA.freeChannelQ, &wait, | |
1022 | TASK_INTERRUPTIBLE); | |
1023 | up(&gDMA.lock); | |
1024 | schedule(); | |
1025 | finish_wait(&gDMA.freeChannelQ, &wait); | |
1026 | ||
1027 | if (signal_pending(current)) { | |
1028 | /* We don't currently hold gDMA.lock, so we return directly */ | |
1029 | ||
1030 | return -ERESTARTSYS; | |
1031 | } | |
1032 | } | |
1033 | ||
1034 | if (down_interruptible(&gDMA.lock)) { | |
1035 | return -ERESTARTSYS; | |
1036 | } | |
1037 | } | |
1038 | ||
1039 | out: | |
1040 | up(&gDMA.lock); | |
1041 | ||
1042 | return handle; | |
1043 | } | |
1044 | ||
1045 | /* Create both _dbg and non _dbg functions for modules. */ | |
1046 | ||
1047 | #if (DMA_DEBUG_TRACK_RESERVATION) | |
1048 | #undef dma_request_channel | |
1049 | DMA_Handle_t dma_request_channel(DMA_Device_t dev) | |
1050 | { | |
1051 | return dma_request_channel_dbg(dev, __FILE__, __LINE__); | |
1052 | } | |
1053 | ||
1054 | EXPORT_SYMBOL(dma_request_channel_dbg); | |
1055 | #endif | |
1056 | EXPORT_SYMBOL(dma_request_channel); | |
1057 | ||
1058 | /****************************************************************************/ | |
1059 | /** | |
1060 | * Frees a previously allocated DMA Handle. | |
1061 | */ | |
1062 | /****************************************************************************/ | |
1063 | ||
1064 | int dma_free_channel(DMA_Handle_t handle /* DMA handle. */ | |
1065 | ) { | |
1066 | int rc = 0; | |
1067 | DMA_Channel_t *channel; | |
1068 | DMA_DeviceAttribute_t *devAttr; | |
1069 | ||
1070 | if (down_interruptible(&gDMA.lock) < 0) { | |
1071 | return -ERESTARTSYS; | |
1072 | } | |
1073 | ||
1074 | channel = HandleToChannel(handle); | |
1075 | if (channel == NULL) { | |
1076 | rc = -EINVAL; | |
1077 | goto out; | |
1078 | } | |
1079 | ||
1080 | devAttr = &DMA_gDeviceAttribute[channel->devType]; | |
1081 | ||
1082 | if ((channel->flags & DMA_CHANNEL_FLAG_IS_DEDICATED) == 0) { | |
1083 | channel->lastDevType = channel->devType; | |
1084 | channel->devType = DMA_DEVICE_NONE; | |
1085 | } | |
1086 | channel->flags &= ~DMA_CHANNEL_FLAG_IN_USE; | |
1087 | devAttr->flags &= ~DMA_DEVICE_FLAG_IN_USE; | |
1088 | ||
1089 | out: | |
1090 | up(&gDMA.lock); | |
1091 | ||
1092 | wake_up_interruptible(&gDMA.freeChannelQ); | |
1093 | ||
1094 | return rc; | |
1095 | } | |
1096 | ||
1097 | EXPORT_SYMBOL(dma_free_channel); | |
1098 | ||
1099 | /****************************************************************************/ | |
1100 | /** | |
1101 | * Determines if a given device has been configured as using a shared | |
1102 | * channel. | |
1103 | * | |
1104 | * @return | |
1105 | * 0 Device uses a dedicated channel | |
1106 | * > zero Device uses a shared channel | |
1107 | * < zero Error code | |
1108 | */ | |
1109 | /****************************************************************************/ | |
1110 | ||
1111 | int dma_device_is_channel_shared(DMA_Device_t device /* Device to check. */ | |
1112 | ) { | |
1113 | DMA_DeviceAttribute_t *devAttr; | |
1114 | ||
1115 | if (!IsDeviceValid(device)) { | |
1116 | return -ENODEV; | |
1117 | } | |
1118 | devAttr = &DMA_gDeviceAttribute[device]; | |
1119 | ||
1120 | return ((devAttr->flags & DMA_DEVICE_FLAG_IS_DEDICATED) == 0); | |
1121 | } | |
1122 | ||
1123 | EXPORT_SYMBOL(dma_device_is_channel_shared); | |
1124 | ||
1125 | /****************************************************************************/ | |
1126 | /** | |
1127 | * Allocates buffers for the descriptors. This is normally done automatically | |
1128 | * but needs to be done explicitly when initiating a dma from interrupt | |
1129 | * context. | |
1130 | * | |
1131 | * @return | |
1132 | * 0 Descriptors were allocated successfully | |
1133 | * -EINVAL Invalid device type for this kind of transfer | |
1134 | * (i.e. the device is _MEM_TO_DEV and not _DEV_TO_MEM) | |
1135 | * -ENOMEM Memory exhausted | |
1136 | */ | |
1137 | /****************************************************************************/ | |
1138 | ||
1139 | int dma_alloc_descriptors(DMA_Handle_t handle, /* DMA Handle */ | |
1140 | dmacHw_TRANSFER_TYPE_e transferType, /* Type of transfer being performed */ | |
1141 | dma_addr_t srcData, /* Place to get data to write to device */ | |
1142 | dma_addr_t dstData, /* Pointer to device data address */ | |
1143 | size_t numBytes /* Number of bytes to transfer to the device */ | |
1144 | ) { | |
1145 | DMA_Channel_t *channel; | |
1146 | DMA_DeviceAttribute_t *devAttr; | |
1147 | int numDescriptors; | |
1148 | size_t ringBytesRequired; | |
1149 | int rc = 0; | |
1150 | ||
1151 | channel = HandleToChannel(handle); | |
1152 | if (channel == NULL) { | |
1153 | return -ENODEV; | |
1154 | } | |
1155 | ||
1156 | devAttr = &DMA_gDeviceAttribute[channel->devType]; | |
1157 | ||
1158 | if (devAttr->config.transferType != transferType) { | |
1159 | return -EINVAL; | |
1160 | } | |
1161 | ||
1162 | /* Figure out how many descriptors we need. */ | |
1163 | ||
1164 | /* printk("srcData: 0x%08x dstData: 0x%08x, numBytes: %d\n", */ | |
1165 | /* srcData, dstData, numBytes); */ | |
1166 | ||
1167 | numDescriptors = dmacHw_calculateDescriptorCount(&devAttr->config, | |
1168 | (void *)srcData, | |
1169 | (void *)dstData, | |
1170 | numBytes); | |
1171 | if (numDescriptors < 0) { | |
1172 | printk(KERN_ERR "%s: dmacHw_calculateDescriptorCount failed\n", | |
1173 | __func__); | |
1174 | return -EINVAL; | |
1175 | } | |
1176 | ||
1177 | /* Check to see if we can reuse the existing descriptor ring, or if we need to allocate */ | |
1178 | /* a new one. */ | |
1179 | ||
1180 | ringBytesRequired = dmacHw_descriptorLen(numDescriptors); | |
1181 | ||
1182 | /* printk("ringBytesRequired: %d\n", ringBytesRequired); */ | |
1183 | ||
1184 | if (ringBytesRequired > devAttr->ring.bytesAllocated) { | |
1185 | /* Make sure that this code path is never taken from interrupt context. */ | |
1186 | /* It's OK for an interrupt to initiate a DMA transfer, but the descriptor */ | |
1187 | /* allocation needs to have already been done. */ | |
1188 | ||
1189 | might_sleep(); | |
1190 | ||
1191 | /* Free the old descriptor ring and allocate a new one. */ | |
1192 | ||
1193 | dma_free_descriptor_ring(&devAttr->ring); | |
1194 | ||
1195 | /* And allocate a new one. */ | |
1196 | ||
1197 | rc = | |
1198 | dma_alloc_descriptor_ring(&devAttr->ring, | |
1199 | numDescriptors); | |
1200 | if (rc < 0) { | |
1201 | printk(KERN_ERR | |
1202 | "%s: dma_alloc_descriptor_ring(%d) failed\n", | |
1203 | __func__, numDescriptors); | |
1204 | return rc; | |
1205 | } | |
1206 | /* Setup the descriptor for this transfer */ | |
1207 | ||
1208 | if (dmacHw_initDescriptor(devAttr->ring.virtAddr, | |
1209 | devAttr->ring.physAddr, | |
1210 | devAttr->ring.bytesAllocated, | |
1211 | numDescriptors) < 0) { | |
1212 | printk(KERN_ERR "%s: dmacHw_initDescriptor failed\n", | |
1213 | __func__); | |
1214 | return -EINVAL; | |
1215 | } | |
1216 | } else { | |
1217 | /* We've already got enough ring buffer allocated. All we need to do is reset */ | |
1218 | /* any control information, just in case the previous DMA was stopped. */ | |
1219 | ||
1220 | dmacHw_resetDescriptorControl(devAttr->ring.virtAddr); | |
1221 | } | |
1222 | ||
1223 | /* dma_alloc/free both set the prevSrc/DstData to 0. If they happen to be the same */ | |
1224 | /* as last time, then we don't need to call setDataDescriptor again. */ | |
1225 | ||
1226 | if (dmacHw_setDataDescriptor(&devAttr->config, | |
1227 | devAttr->ring.virtAddr, | |
1228 | (void *)srcData, | |
1229 | (void *)dstData, numBytes) < 0) { | |
1230 | printk(KERN_ERR "%s: dmacHw_setDataDescriptor failed\n", | |
1231 | __func__); | |
1232 | return -EINVAL; | |
1233 | } | |
1234 | ||
1235 | /* Remember the critical information for this transfer so that we can eliminate */ | |
1236 | /* another call to dma_alloc_descriptors if the caller reuses the same buffers */ | |
1237 | ||
1238 | devAttr->prevSrcData = srcData; | |
1239 | devAttr->prevDstData = dstData; | |
1240 | devAttr->prevNumBytes = numBytes; | |
1241 | ||
1242 | return 0; | |
1243 | } | |
1244 | ||
1245 | EXPORT_SYMBOL(dma_alloc_descriptors); | |
1246 | ||
1247 | /****************************************************************************/ | |
1248 | /** | |
1249 | * Allocates and sets up descriptors for a double buffered circular buffer. | |
1250 | * | |
1251 | * This is primarily intended to be used for things like the ingress samples | |
1252 | * from a microphone. | |
1253 | * | |
1254 | * @return | |
1255 | * > 0 Number of descriptors actually allocated. | |
1256 | * -EINVAL Invalid device type for this kind of transfer | |
1257 | * (i.e. the device is _MEM_TO_DEV and not _DEV_TO_MEM) | |
1258 | * -ENOMEM Memory exhausted | |
1259 | */ | |
1260 | /****************************************************************************/ | |
1261 | ||
1262 | int dma_alloc_double_dst_descriptors(DMA_Handle_t handle, /* DMA Handle */ | |
1263 | dma_addr_t srcData, /* Physical address of source data */ | |
1264 | dma_addr_t dstData1, /* Physical address of first destination buffer */ | |
1265 | dma_addr_t dstData2, /* Physical address of second destination buffer */ | |
1266 | size_t numBytes /* Number of bytes in each destination buffer */ | |
1267 | ) { | |
1268 | DMA_Channel_t *channel; | |
1269 | DMA_DeviceAttribute_t *devAttr; | |
1270 | int numDst1Descriptors; | |
1271 | int numDst2Descriptors; | |
1272 | int numDescriptors; | |
1273 | size_t ringBytesRequired; | |
1274 | int rc = 0; | |
1275 | ||
1276 | channel = HandleToChannel(handle); | |
1277 | if (channel == NULL) { | |
1278 | return -ENODEV; | |
1279 | } | |
1280 | ||
1281 | devAttr = &DMA_gDeviceAttribute[channel->devType]; | |
1282 | ||
1283 | /* Figure out how many descriptors we need. */ | |
1284 | ||
1285 | /* printk("srcData: 0x%08x dstData: 0x%08x, numBytes: %d\n", */ | |
1286 | /* srcData, dstData, numBytes); */ | |
1287 | ||
1288 | numDst1Descriptors = | |
1289 | dmacHw_calculateDescriptorCount(&devAttr->config, (void *)srcData, | |
1290 | (void *)dstData1, numBytes); | |
1291 | if (numDst1Descriptors < 0) { | |
1292 | return -EINVAL; | |
1293 | } | |
1294 | numDst2Descriptors = | |
1295 | dmacHw_calculateDescriptorCount(&devAttr->config, (void *)srcData, | |
1296 | (void *)dstData2, numBytes); | |
1297 | if (numDst2Descriptors < 0) { | |
1298 | return -EINVAL; | |
1299 | } | |
1300 | numDescriptors = numDst1Descriptors + numDst2Descriptors; | |
1301 | /* printk("numDescriptors: %d\n", numDescriptors); */ | |
1302 | ||
1303 | /* Check to see if we can reuse the existing descriptor ring, or if we need to allocate */ | |
1304 | /* a new one. */ | |
1305 | ||
1306 | ringBytesRequired = dmacHw_descriptorLen(numDescriptors); | |
1307 | ||
1308 | /* printk("ringBytesRequired: %d\n", ringBytesRequired); */ | |
1309 | ||
1310 | if (ringBytesRequired > devAttr->ring.bytesAllocated) { | |
1311 | /* Make sure that this code path is never taken from interrupt context. */ | |
1312 | /* It's OK for an interrupt to initiate a DMA transfer, but the descriptor */ | |
1313 | /* allocation needs to have already been done. */ | |
1314 | ||
1315 | might_sleep(); | |
1316 | ||
1317 | /* Free the old descriptor ring and allocate a new one. */ | |
1318 | ||
1319 | dma_free_descriptor_ring(&devAttr->ring); | |
1320 | ||
1321 | /* And allocate a new one. */ | |
1322 | ||
1323 | rc = | |
1324 | dma_alloc_descriptor_ring(&devAttr->ring, | |
1325 | numDescriptors); | |
1326 | if (rc < 0) { | |
1327 | printk(KERN_ERR | |
1328 | "%s: dma_alloc_descriptor_ring(%d) failed\n", | |
1329 | __func__, ringBytesRequired); | |
1330 | return rc; | |
1331 | } | |
1332 | } | |
1333 | ||
1334 | /* Setup the descriptor for this transfer. Since this function is used with */ | |
1335 | /* CONTINUOUS DMA operations, we need to reinitialize every time, otherwise */ | |
1336 | /* setDataDescriptor will keep trying to append onto the end. */ | |
1337 | ||
1338 | if (dmacHw_initDescriptor(devAttr->ring.virtAddr, | |
1339 | devAttr->ring.physAddr, | |
1340 | devAttr->ring.bytesAllocated, | |
1341 | numDescriptors) < 0) { | |
1342 | printk(KERN_ERR "%s: dmacHw_initDescriptor failed\n", __func__); | |
1343 | return -EINVAL; | |
1344 | } | |
1345 | ||
1346 | /* dma_alloc/free both set the prevSrc/DstData to 0. If they happen to be the same */ | |
1347 | /* as last time, then we don't need to call setDataDescriptor again. */ | |
1348 | ||
1349 | if (dmacHw_setDataDescriptor(&devAttr->config, | |
1350 | devAttr->ring.virtAddr, | |
1351 | (void *)srcData, | |
1352 | (void *)dstData1, numBytes) < 0) { | |
1353 | printk(KERN_ERR "%s: dmacHw_setDataDescriptor 1 failed\n", | |
1354 | __func__); | |
1355 | return -EINVAL; | |
1356 | } | |
1357 | if (dmacHw_setDataDescriptor(&devAttr->config, | |
1358 | devAttr->ring.virtAddr, | |
1359 | (void *)srcData, | |
1360 | (void *)dstData2, numBytes) < 0) { | |
1361 | printk(KERN_ERR "%s: dmacHw_setDataDescriptor 2 failed\n", | |
1362 | __func__); | |
1363 | return -EINVAL; | |
1364 | } | |
1365 | ||
1366 | /* You should use dma_start_transfer rather than dma_transfer_xxx so we don't */ | |
1367 | /* try to make the 'prev' variables right. */ | |
1368 | ||
1369 | devAttr->prevSrcData = 0; | |
1370 | devAttr->prevDstData = 0; | |
1371 | devAttr->prevNumBytes = 0; | |
1372 | ||
1373 | return numDescriptors; | |
1374 | } | |
1375 | ||
1376 | EXPORT_SYMBOL(dma_alloc_double_dst_descriptors); | |
1377 | ||
1378 | /****************************************************************************/ | |
1379 | /** | |
1380 | * Initiates a transfer when the descriptors have already been setup. | |
1381 | * | |
1382 | * This is a special case, and normally, the dma_transfer_xxx functions should | |
1383 | * be used. | |
1384 | * | |
1385 | * @return | |
1386 | * 0 Transfer was started successfully | |
1387 | * -ENODEV Invalid handle | |
1388 | */ | |
1389 | /****************************************************************************/ | |
1390 | ||
1391 | int dma_start_transfer(DMA_Handle_t handle) | |
1392 | { | |
1393 | DMA_Channel_t *channel; | |
1394 | DMA_DeviceAttribute_t *devAttr; | |
1395 | ||
1396 | channel = HandleToChannel(handle); | |
1397 | if (channel == NULL) { | |
1398 | return -ENODEV; | |
1399 | } | |
1400 | devAttr = &DMA_gDeviceAttribute[channel->devType]; | |
1401 | ||
1402 | dmacHw_initiateTransfer(channel->dmacHwHandle, &devAttr->config, | |
1403 | devAttr->ring.virtAddr); | |
1404 | ||
1405 | /* Since we got this far, everything went successfully */ | |
1406 | ||
1407 | return 0; | |
1408 | } | |
1409 | ||
1410 | EXPORT_SYMBOL(dma_start_transfer); | |
1411 | ||
1412 | /****************************************************************************/ | |
1413 | /** | |
1414 | * Stops a previously started DMA transfer. | |
1415 | * | |
1416 | * @return | |
1417 | * 0 Transfer was stopped successfully | |
1418 | * -ENODEV Invalid handle | |
1419 | */ | |
1420 | /****************************************************************************/ | |
1421 | ||
1422 | int dma_stop_transfer(DMA_Handle_t handle) | |
1423 | { | |
1424 | DMA_Channel_t *channel; | |
1425 | ||
1426 | channel = HandleToChannel(handle); | |
1427 | if (channel == NULL) { | |
1428 | return -ENODEV; | |
1429 | } | |
1430 | ||
1431 | dmacHw_stopTransfer(channel->dmacHwHandle); | |
1432 | ||
1433 | return 0; | |
1434 | } | |
1435 | ||
1436 | EXPORT_SYMBOL(dma_stop_transfer); | |
1437 | ||
1438 | /****************************************************************************/ | |
1439 | /** | |
1440 | * Waits for a DMA to complete by polling. This function is only intended | |
1441 | * to be used for testing. Interrupts should be used for most DMA operations. | |
1442 | */ | |
1443 | /****************************************************************************/ | |
1444 | ||
1445 | int dma_wait_transfer_done(DMA_Handle_t handle) | |
1446 | { | |
1447 | DMA_Channel_t *channel; | |
1448 | dmacHw_TRANSFER_STATUS_e status; | |
1449 | ||
1450 | channel = HandleToChannel(handle); | |
1451 | if (channel == NULL) { | |
1452 | return -ENODEV; | |
1453 | } | |
1454 | ||
1455 | while ((status = | |
1456 | dmacHw_transferCompleted(channel->dmacHwHandle)) == | |
1457 | dmacHw_TRANSFER_STATUS_BUSY) { | |
1458 | ; | |
1459 | } | |
1460 | ||
1461 | if (status == dmacHw_TRANSFER_STATUS_ERROR) { | |
1462 | printk(KERN_ERR "%s: DMA transfer failed\n", __func__); | |
1463 | return -EIO; | |
1464 | } | |
1465 | return 0; | |
1466 | } | |
1467 | ||
1468 | EXPORT_SYMBOL(dma_wait_transfer_done); | |
1469 | ||
1470 | /****************************************************************************/ | |
1471 | /** | |
1472 | * Initiates a DMA, allocating the descriptors as required. | |
1473 | * | |
1474 | * @return | |
1475 | * 0 Transfer was started successfully | |
1476 | * -EINVAL Invalid device type for this kind of transfer | |
1477 | * (i.e. the device is _DEV_TO_MEM and not _MEM_TO_DEV) | |
1478 | */ | |
1479 | /****************************************************************************/ | |
1480 | ||
1481 | int dma_transfer(DMA_Handle_t handle, /* DMA Handle */ | |
1482 | dmacHw_TRANSFER_TYPE_e transferType, /* Type of transfer being performed */ | |
1483 | dma_addr_t srcData, /* Place to get data to write to device */ | |
1484 | dma_addr_t dstData, /* Pointer to device data address */ | |
1485 | size_t numBytes /* Number of bytes to transfer to the device */ | |
1486 | ) { | |
1487 | DMA_Channel_t *channel; | |
1488 | DMA_DeviceAttribute_t *devAttr; | |
1489 | int rc = 0; | |
1490 | ||
1491 | channel = HandleToChannel(handle); | |
1492 | if (channel == NULL) { | |
1493 | return -ENODEV; | |
1494 | } | |
1495 | ||
1496 | devAttr = &DMA_gDeviceAttribute[channel->devType]; | |
1497 | ||
1498 | if (devAttr->config.transferType != transferType) { | |
1499 | return -EINVAL; | |
1500 | } | |
1501 | ||
1502 | /* We keep track of the information about the previous request for this */ | |
1503 | /* device, and if the attributes match, then we can use the descriptors we setup */ | |
1504 | /* the last time, and not have to reinitialize everything. */ | |
1505 | ||
1506 | { | |
1507 | rc = | |
1508 | dma_alloc_descriptors(handle, transferType, srcData, | |
1509 | dstData, numBytes); | |
1510 | if (rc != 0) { | |
1511 | return rc; | |
1512 | } | |
1513 | } | |
1514 | ||
1515 | /* And kick off the transfer */ | |
1516 | ||
1517 | devAttr->numBytes = numBytes; | |
1518 | devAttr->transferStartTime = timer_get_tick_count(); | |
1519 | ||
1520 | dmacHw_initiateTransfer(channel->dmacHwHandle, &devAttr->config, | |
1521 | devAttr->ring.virtAddr); | |
1522 | ||
1523 | /* Since we got this far, everything went successfully */ | |
1524 | ||
1525 | return 0; | |
1526 | } | |
1527 | ||
1528 | EXPORT_SYMBOL(dma_transfer); | |
1529 | ||
1530 | /****************************************************************************/ | |
1531 | /** | |
1532 | * Set the callback function which will be called when a transfer completes. | |
1533 | * If a NULL callback function is set, then no callback will occur. | |
1534 | * | |
1535 | * @note @a devHandler will be called from IRQ context. | |
1536 | * | |
1537 | * @return | |
1538 | * 0 - Success | |
1539 | * -ENODEV - Device handed in is invalid. | |
1540 | */ | |
1541 | /****************************************************************************/ | |
1542 | ||
1543 | int dma_set_device_handler(DMA_Device_t dev, /* Device to set the callback for. */ | |
1544 | DMA_DeviceHandler_t devHandler, /* Function to call when the DMA completes */ | |
1545 | void *userData /* Pointer which will be passed to devHandler. */ | |
1546 | ) { | |
1547 | DMA_DeviceAttribute_t *devAttr; | |
1548 | unsigned long flags; | |
1549 | ||
1550 | if (!IsDeviceValid(dev)) { | |
1551 | return -ENODEV; | |
1552 | } | |
1553 | devAttr = &DMA_gDeviceAttribute[dev]; | |
1554 | ||
1555 | local_irq_save(flags); | |
1556 | ||
1557 | devAttr->userData = userData; | |
1558 | devAttr->devHandler = devHandler; | |
1559 | ||
1560 | local_irq_restore(flags); | |
1561 | ||
1562 | return 0; | |
1563 | } | |
1564 | ||
1565 | EXPORT_SYMBOL(dma_set_device_handler); | |
1566 | ||
1567 | /****************************************************************************/ | |
1568 | /** | |
1569 | * Initializes a memory mapping structure | |
1570 | */ | |
1571 | /****************************************************************************/ | |
1572 | ||
1573 | int dma_init_mem_map(DMA_MemMap_t *memMap) | |
1574 | { | |
1575 | memset(memMap, 0, sizeof(*memMap)); | |
1576 | ||
5356d948 | 1577 | sema_init(&memMap->lock, 1); |
859277f7 LC |
1578 | |
1579 | return 0; | |
1580 | } | |
1581 | ||
1582 | EXPORT_SYMBOL(dma_init_mem_map); | |
1583 | ||
1584 | /****************************************************************************/ | |
1585 | /** | |
1586 | * Releases any memory currently being held by a memory mapping structure. | |
1587 | */ | |
1588 | /****************************************************************************/ | |
1589 | ||
1590 | int dma_term_mem_map(DMA_MemMap_t *memMap) | |
1591 | { | |
1592 | down(&memMap->lock); /* Just being paranoid */ | |
1593 | ||
1594 | /* Free up any allocated memory */ | |
1595 | ||
1596 | up(&memMap->lock); | |
1597 | memset(memMap, 0, sizeof(*memMap)); | |
1598 | ||
1599 | return 0; | |
1600 | } | |
1601 | ||
1602 | EXPORT_SYMBOL(dma_term_mem_map); | |
1603 | ||
1604 | /****************************************************************************/ | |
1605 | /** | |
1606 | * Looks at a memory address and categorizes it. | |
1607 | * | |
1608 | * @return One of the values from the DMA_MemType_t enumeration. | |
1609 | */ | |
1610 | /****************************************************************************/ | |
1611 | ||
1612 | DMA_MemType_t dma_mem_type(void *addr) | |
1613 | { | |
1614 | unsigned long addrVal = (unsigned long)addr; | |
1615 | ||
1616 | if (addrVal >= VMALLOC_END) { | |
1617 | /* NOTE: DMA virtual memory space starts at 0xFFxxxxxx */ | |
1618 | ||
1619 | /* dma_alloc_xxx pages are physically and virtually contiguous */ | |
1620 | ||
1621 | return DMA_MEM_TYPE_DMA; | |
1622 | } | |
1623 | ||
1624 | /* Technically, we could add one more classification. Addresses between VMALLOC_END */ | |
1625 | /* and the beginning of the DMA virtual address could be considered to be I/O space. */ | |
1626 | /* Right now, nobody cares about this particular classification, so we ignore it. */ | |
1627 | ||
1628 | if (is_vmalloc_addr(addr)) { | |
1629 | /* Address comes from the vmalloc'd region. Pages are virtually */ | |
1630 | /* contiguous but NOT physically contiguous */ | |
1631 | ||
1632 | return DMA_MEM_TYPE_VMALLOC; | |
1633 | } | |
1634 | ||
1635 | if (addrVal >= PAGE_OFFSET) { | |
1636 | /* PAGE_OFFSET is typically 0xC0000000 */ | |
1637 | ||
1638 | /* kmalloc'd pages are physically contiguous */ | |
1639 | ||
1640 | return DMA_MEM_TYPE_KMALLOC; | |
1641 | } | |
1642 | ||
1643 | return DMA_MEM_TYPE_USER; | |
1644 | } | |
1645 | ||
1646 | EXPORT_SYMBOL(dma_mem_type); | |
1647 | ||
1648 | /****************************************************************************/ | |
1649 | /** | |
1650 | * Looks at a memory address and determines if we support DMA'ing to/from | |
1651 | * that type of memory. | |
1652 | * | |
1653 | * @return boolean - | |
1654 | * return value != 0 means dma supported | |
1655 | * return value == 0 means dma not supported | |
1656 | */ | |
1657 | /****************************************************************************/ | |
1658 | ||
1659 | int dma_mem_supports_dma(void *addr) | |
1660 | { | |
1661 | DMA_MemType_t memType = dma_mem_type(addr); | |
1662 | ||
1663 | return (memType == DMA_MEM_TYPE_DMA) | |
1664 | #if ALLOW_MAP_OF_KMALLOC_MEMORY | |
1665 | || (memType == DMA_MEM_TYPE_KMALLOC) | |
1666 | #endif | |
1667 | || (memType == DMA_MEM_TYPE_USER); | |
1668 | } | |
1669 | ||
1670 | EXPORT_SYMBOL(dma_mem_supports_dma); | |
1671 | ||
1672 | /****************************************************************************/ | |
1673 | /** | |
1674 | * Maps in a memory region such that it can be used for performing a DMA. | |
1675 | * | |
1676 | * @return | |
1677 | */ | |
1678 | /****************************************************************************/ | |
1679 | ||
1680 | int dma_map_start(DMA_MemMap_t *memMap, /* Stores state information about the map */ | |
1681 | enum dma_data_direction dir /* Direction that the mapping will be going */ | |
1682 | ) { | |
1683 | int rc; | |
1684 | ||
1685 | down(&memMap->lock); | |
1686 | ||
1687 | DMA_MAP_PRINT("memMap: %p\n", memMap); | |
1688 | ||
1689 | if (memMap->inUse) { | |
1690 | printk(KERN_ERR "%s: memory map %p is already being used\n", | |
1691 | __func__, memMap); | |
1692 | rc = -EBUSY; | |
1693 | goto out; | |
1694 | } | |
1695 | ||
1696 | memMap->inUse = 1; | |
1697 | memMap->dir = dir; | |
1698 | memMap->numRegionsUsed = 0; | |
1699 | ||
1700 | rc = 0; | |
1701 | ||
1702 | out: | |
1703 | ||
1704 | DMA_MAP_PRINT("returning %d", rc); | |
1705 | ||
1706 | up(&memMap->lock); | |
1707 | ||
1708 | return rc; | |
1709 | } | |
1710 | ||
1711 | EXPORT_SYMBOL(dma_map_start); | |
1712 | ||
1713 | /****************************************************************************/ | |
1714 | /** | |
1715 | * Adds a segment of memory to a memory map. Each segment is both | |
1716 | * physically and virtually contiguous. | |
1717 | * | |
1718 | * @return 0 on success, error code otherwise. | |
1719 | */ | |
1720 | /****************************************************************************/ | |
1721 | ||
1722 | static int dma_map_add_segment(DMA_MemMap_t *memMap, /* Stores state information about the map */ | |
1723 | DMA_Region_t *region, /* Region that the segment belongs to */ | |
1724 | void *virtAddr, /* Virtual address of the segment being added */ | |
1725 | dma_addr_t physAddr, /* Physical address of the segment being added */ | |
1726 | size_t numBytes /* Number of bytes of the segment being added */ | |
1727 | ) { | |
1728 | DMA_Segment_t *segment; | |
1729 | ||
1730 | DMA_MAP_PRINT("memMap:%p va:%p pa:0x%x #:%d\n", memMap, virtAddr, | |
1731 | physAddr, numBytes); | |
1732 | ||
1733 | /* Sanity check */ | |
1734 | ||
1735 | if (((unsigned long)virtAddr < (unsigned long)region->virtAddr) | |
1736 | || (((unsigned long)virtAddr + numBytes)) > | |
1737 | ((unsigned long)region->virtAddr + region->numBytes)) { | |
1738 | printk(KERN_ERR | |
1739 | "%s: virtAddr %p is outside region @ %p len: %d\n", | |
1740 | __func__, virtAddr, region->virtAddr, region->numBytes); | |
1741 | return -EINVAL; | |
1742 | } | |
1743 | ||
1744 | if (region->numSegmentsUsed > 0) { | |
1745 | /* Check to see if this segment is physically contiguous with the previous one */ | |
1746 | ||
1747 | segment = ®ion->segment[region->numSegmentsUsed - 1]; | |
1748 | ||
1749 | if ((segment->physAddr + segment->numBytes) == physAddr) { | |
1750 | /* It is - just add on to the end */ | |
1751 | ||
1752 | DMA_MAP_PRINT("appending %d bytes to last segment\n", | |
1753 | numBytes); | |
1754 | ||
1755 | segment->numBytes += numBytes; | |
1756 | ||
1757 | return 0; | |
1758 | } | |
1759 | } | |
1760 | ||
1761 | /* Reallocate to hold more segments, if required. */ | |
1762 | ||
1763 | if (region->numSegmentsUsed >= region->numSegmentsAllocated) { | |
1764 | DMA_Segment_t *newSegment; | |
1765 | size_t oldSize = | |
1766 | region->numSegmentsAllocated * sizeof(*newSegment); | |
1767 | int newAlloc = region->numSegmentsAllocated + 4; | |
1768 | size_t newSize = newAlloc * sizeof(*newSegment); | |
1769 | ||
1770 | newSegment = kmalloc(newSize, GFP_KERNEL); | |
1771 | if (newSegment == NULL) { | |
1772 | return -ENOMEM; | |
1773 | } | |
1774 | memcpy(newSegment, region->segment, oldSize); | |
1775 | memset(&((uint8_t *) newSegment)[oldSize], 0, | |
1776 | newSize - oldSize); | |
1777 | kfree(region->segment); | |
1778 | ||
1779 | region->numSegmentsAllocated = newAlloc; | |
1780 | region->segment = newSegment; | |
1781 | } | |
1782 | ||
1783 | segment = ®ion->segment[region->numSegmentsUsed]; | |
1784 | region->numSegmentsUsed++; | |
1785 | ||
1786 | segment->virtAddr = virtAddr; | |
1787 | segment->physAddr = physAddr; | |
1788 | segment->numBytes = numBytes; | |
1789 | ||
1790 | DMA_MAP_PRINT("returning success\n"); | |
1791 | ||
1792 | return 0; | |
1793 | } | |
1794 | ||
1795 | /****************************************************************************/ | |
1796 | /** | |
1797 | * Adds a region of memory to a memory map. Each region is virtually | |
1798 | * contiguous, but not necessarily physically contiguous. | |
1799 | * | |
1800 | * @return 0 on success, error code otherwise. | |
1801 | */ | |
1802 | /****************************************************************************/ | |
1803 | ||
1804 | int dma_map_add_region(DMA_MemMap_t *memMap, /* Stores state information about the map */ | |
1805 | void *mem, /* Virtual address that we want to get a map of */ | |
1806 | size_t numBytes /* Number of bytes being mapped */ | |
1807 | ) { | |
1808 | unsigned long addr = (unsigned long)mem; | |
1809 | unsigned int offset; | |
1810 | int rc = 0; | |
1811 | DMA_Region_t *region; | |
1812 | dma_addr_t physAddr; | |
1813 | ||
1814 | down(&memMap->lock); | |
1815 | ||
1816 | DMA_MAP_PRINT("memMap:%p va:%p #:%d\n", memMap, mem, numBytes); | |
1817 | ||
1818 | if (!memMap->inUse) { | |
1819 | printk(KERN_ERR "%s: Make sure you call dma_map_start first\n", | |
1820 | __func__); | |
1821 | rc = -EINVAL; | |
1822 | goto out; | |
1823 | } | |
1824 | ||
1825 | /* Reallocate to hold more regions. */ | |
1826 | ||
1827 | if (memMap->numRegionsUsed >= memMap->numRegionsAllocated) { | |
1828 | DMA_Region_t *newRegion; | |
1829 | size_t oldSize = | |
1830 | memMap->numRegionsAllocated * sizeof(*newRegion); | |
1831 | int newAlloc = memMap->numRegionsAllocated + 4; | |
1832 | size_t newSize = newAlloc * sizeof(*newRegion); | |
1833 | ||
1834 | newRegion = kmalloc(newSize, GFP_KERNEL); | |
1835 | if (newRegion == NULL) { | |
1836 | rc = -ENOMEM; | |
1837 | goto out; | |
1838 | } | |
1839 | memcpy(newRegion, memMap->region, oldSize); | |
1840 | memset(&((uint8_t *) newRegion)[oldSize], 0, newSize - oldSize); | |
1841 | ||
1842 | kfree(memMap->region); | |
1843 | ||
1844 | memMap->numRegionsAllocated = newAlloc; | |
1845 | memMap->region = newRegion; | |
1846 | } | |
1847 | ||
1848 | region = &memMap->region[memMap->numRegionsUsed]; | |
1849 | memMap->numRegionsUsed++; | |
1850 | ||
1851 | offset = addr & ~PAGE_MASK; | |
1852 | ||
1853 | region->memType = dma_mem_type(mem); | |
1854 | region->virtAddr = mem; | |
1855 | region->numBytes = numBytes; | |
1856 | region->numSegmentsUsed = 0; | |
1857 | region->numLockedPages = 0; | |
1858 | region->lockedPages = NULL; | |
1859 | ||
1860 | switch (region->memType) { | |
1861 | case DMA_MEM_TYPE_VMALLOC: | |
1862 | { | |
1863 | atomic_inc(&gDmaStatMemTypeVmalloc); | |
1864 | ||
1865 | /* printk(KERN_ERR "%s: vmalloc'd pages are not supported\n", __func__); */ | |
1866 | ||
1867 | /* vmalloc'd pages are not physically contiguous */ | |
1868 | ||
1869 | rc = -EINVAL; | |
1870 | break; | |
1871 | } | |
1872 | ||
1873 | case DMA_MEM_TYPE_KMALLOC: | |
1874 | { | |
1875 | atomic_inc(&gDmaStatMemTypeKmalloc); | |
1876 | ||
1877 | /* kmalloc'd pages are physically contiguous, so they'll have exactly */ | |
1878 | /* one segment */ | |
1879 | ||
1880 | #if ALLOW_MAP_OF_KMALLOC_MEMORY | |
1881 | physAddr = | |
1882 | dma_map_single(NULL, mem, numBytes, memMap->dir); | |
1883 | rc = dma_map_add_segment(memMap, region, mem, physAddr, | |
1884 | numBytes); | |
1885 | #else | |
1886 | rc = -EINVAL; | |
1887 | #endif | |
1888 | break; | |
1889 | } | |
1890 | ||
1891 | case DMA_MEM_TYPE_DMA: | |
1892 | { | |
1893 | /* dma_alloc_xxx pages are physically contiguous */ | |
1894 | ||
1895 | atomic_inc(&gDmaStatMemTypeCoherent); | |
1896 | ||
1897 | physAddr = (vmalloc_to_pfn(mem) << PAGE_SHIFT) + offset; | |
1898 | ||
1899 | dma_sync_single_for_cpu(NULL, physAddr, numBytes, | |
1900 | memMap->dir); | |
1901 | rc = dma_map_add_segment(memMap, region, mem, physAddr, | |
1902 | numBytes); | |
1903 | break; | |
1904 | } | |
1905 | ||
1906 | case DMA_MEM_TYPE_USER: | |
1907 | { | |
1908 | size_t firstPageOffset; | |
1909 | size_t firstPageSize; | |
1910 | struct page **pages; | |
1911 | struct task_struct *userTask; | |
1912 | ||
1913 | atomic_inc(&gDmaStatMemTypeUser); | |
1914 | ||
1915 | #if 1 | |
1916 | /* If the pages are user pages, then the dma_mem_map_set_user_task function */ | |
1917 | /* must have been previously called. */ | |
1918 | ||
1919 | if (memMap->userTask == NULL) { | |
1920 | printk(KERN_ERR | |
1921 | "%s: must call dma_mem_map_set_user_task when using user-mode memory\n", | |
1922 | __func__); | |
1923 | return -EINVAL; | |
1924 | } | |
1925 | ||
1926 | /* User pages need to be locked. */ | |
1927 | ||
1928 | firstPageOffset = | |
1929 | (unsigned long)region->virtAddr & (PAGE_SIZE - 1); | |
1930 | firstPageSize = PAGE_SIZE - firstPageOffset; | |
1931 | ||
1932 | region->numLockedPages = (firstPageOffset | |
1933 | + region->numBytes + | |
1934 | PAGE_SIZE - 1) / PAGE_SIZE; | |
1935 | pages = | |
1936 | kmalloc(region->numLockedPages * | |
1937 | sizeof(struct page *), GFP_KERNEL); | |
1938 | ||
1939 | if (pages == NULL) { | |
1940 | region->numLockedPages = 0; | |
1941 | return -ENOMEM; | |
1942 | } | |
1943 | ||
1944 | userTask = memMap->userTask; | |
1945 | ||
1946 | down_read(&userTask->mm->mmap_sem); | |
1947 | rc = get_user_pages(userTask, /* task */ | |
1948 | userTask->mm, /* mm */ | |
1949 | (unsigned long)region->virtAddr, /* start */ | |
1950 | region->numLockedPages, /* len */ | |
1951 | memMap->dir == DMA_FROM_DEVICE, /* write */ | |
1952 | 0, /* force */ | |
1953 | pages, /* pages (array of pointers to page) */ | |
1954 | NULL); /* vmas */ | |
1955 | up_read(&userTask->mm->mmap_sem); | |
1956 | ||
1957 | if (rc != region->numLockedPages) { | |
1958 | kfree(pages); | |
1959 | region->numLockedPages = 0; | |
1960 | ||
1961 | if (rc >= 0) { | |
1962 | rc = -EINVAL; | |
1963 | } | |
1964 | } else { | |
1965 | uint8_t *virtAddr = region->virtAddr; | |
1966 | size_t bytesRemaining; | |
1967 | int pageIdx; | |
1968 | ||
1969 | rc = 0; /* Since get_user_pages returns +ve number */ | |
1970 | ||
1971 | region->lockedPages = pages; | |
1972 | ||
1973 | /* We've locked the user pages. Now we need to walk them and figure */ | |
1974 | /* out the physical addresses. */ | |
1975 | ||
1976 | /* The first page may be partial */ | |
1977 | ||
1978 | dma_map_add_segment(memMap, | |
1979 | region, | |
1980 | virtAddr, | |
1981 | PFN_PHYS(page_to_pfn | |
1982 | (pages[0])) + | |
1983 | firstPageOffset, | |
1984 | firstPageSize); | |
1985 | ||
1986 | virtAddr += firstPageSize; | |
1987 | bytesRemaining = | |
1988 | region->numBytes - firstPageSize; | |
1989 | ||
1990 | for (pageIdx = 1; | |
1991 | pageIdx < region->numLockedPages; | |
1992 | pageIdx++) { | |
1993 | size_t bytesThisPage = | |
1994 | (bytesRemaining > | |
1995 | PAGE_SIZE ? PAGE_SIZE : | |
1996 | bytesRemaining); | |
1997 | ||
1998 | DMA_MAP_PRINT | |
1999 | ("pageIdx:%d pages[pageIdx]=%p pfn=%u phys=%u\n", | |
2000 | pageIdx, pages[pageIdx], | |
2001 | page_to_pfn(pages[pageIdx]), | |
2002 | PFN_PHYS(page_to_pfn | |
2003 | (pages[pageIdx]))); | |
2004 | ||
2005 | dma_map_add_segment(memMap, | |
2006 | region, | |
2007 | virtAddr, | |
2008 | PFN_PHYS(page_to_pfn | |
2009 | (pages | |
2010 | [pageIdx])), | |
2011 | bytesThisPage); | |
2012 | ||
2013 | virtAddr += bytesThisPage; | |
2014 | bytesRemaining -= bytesThisPage; | |
2015 | } | |
2016 | } | |
2017 | #else | |
2018 | printk(KERN_ERR | |
2019 | "%s: User mode pages are not yet supported\n", | |
2020 | __func__); | |
2021 | ||
2022 | /* user pages are not physically contiguous */ | |
2023 | ||
2024 | rc = -EINVAL; | |
2025 | #endif | |
2026 | break; | |
2027 | } | |
2028 | ||
2029 | default: | |
2030 | { | |
2031 | printk(KERN_ERR "%s: Unsupported memory type: %d\n", | |
2032 | __func__, region->memType); | |
2033 | ||
2034 | rc = -EINVAL; | |
2035 | break; | |
2036 | } | |
2037 | } | |
2038 | ||
2039 | if (rc != 0) { | |
2040 | memMap->numRegionsUsed--; | |
2041 | } | |
2042 | ||
2043 | out: | |
2044 | ||
2045 | DMA_MAP_PRINT("returning %d\n", rc); | |
2046 | ||
2047 | up(&memMap->lock); | |
2048 | ||
2049 | return rc; | |
2050 | } | |
2051 | ||
2052 | EXPORT_SYMBOL(dma_map_add_segment); | |
2053 | ||
2054 | /****************************************************************************/ | |
2055 | /** | |
2056 | * Maps in a memory region such that it can be used for performing a DMA. | |
2057 | * | |
2058 | * @return 0 on success, error code otherwise. | |
2059 | */ | |
2060 | /****************************************************************************/ | |
2061 | ||
2062 | int dma_map_mem(DMA_MemMap_t *memMap, /* Stores state information about the map */ | |
2063 | void *mem, /* Virtual address that we want to get a map of */ | |
2064 | size_t numBytes, /* Number of bytes being mapped */ | |
2065 | enum dma_data_direction dir /* Direction that the mapping will be going */ | |
2066 | ) { | |
2067 | int rc; | |
2068 | ||
2069 | rc = dma_map_start(memMap, dir); | |
2070 | if (rc == 0) { | |
2071 | rc = dma_map_add_region(memMap, mem, numBytes); | |
2072 | if (rc < 0) { | |
2073 | /* Since the add fails, this function will fail, and the caller won't */ | |
2074 | /* call unmap, so we need to do it here. */ | |
2075 | ||
2076 | dma_unmap(memMap, 0); | |
2077 | } | |
2078 | } | |
2079 | ||
2080 | return rc; | |
2081 | } | |
2082 | ||
2083 | EXPORT_SYMBOL(dma_map_mem); | |
2084 | ||
2085 | /****************************************************************************/ | |
2086 | /** | |
2087 | * Setup a descriptor ring for a given memory map. | |
2088 | * | |
2089 | * It is assumed that the descriptor ring has already been initialized, and | |
2090 | * this routine will only reallocate a new descriptor ring if the existing | |
2091 | * one is too small. | |
2092 | * | |
2093 | * @return 0 on success, error code otherwise. | |
2094 | */ | |
2095 | /****************************************************************************/ | |
2096 | ||
2097 | int dma_map_create_descriptor_ring(DMA_Device_t dev, /* DMA device (where the ring is stored) */ | |
2098 | DMA_MemMap_t *memMap, /* Memory map that will be used */ | |
2099 | dma_addr_t devPhysAddr /* Physical address of device */ | |
2100 | ) { | |
2101 | int rc; | |
2102 | int numDescriptors; | |
2103 | DMA_DeviceAttribute_t *devAttr; | |
2104 | DMA_Region_t *region; | |
2105 | DMA_Segment_t *segment; | |
2106 | dma_addr_t srcPhysAddr; | |
2107 | dma_addr_t dstPhysAddr; | |
2108 | int regionIdx; | |
2109 | int segmentIdx; | |
2110 | ||
2111 | devAttr = &DMA_gDeviceAttribute[dev]; | |
2112 | ||
2113 | down(&memMap->lock); | |
2114 | ||
2115 | /* Figure out how many descriptors we need */ | |
2116 | ||
2117 | numDescriptors = 0; | |
2118 | for (regionIdx = 0; regionIdx < memMap->numRegionsUsed; regionIdx++) { | |
2119 | region = &memMap->region[regionIdx]; | |
2120 | ||
2121 | for (segmentIdx = 0; segmentIdx < region->numSegmentsUsed; | |
2122 | segmentIdx++) { | |
2123 | segment = ®ion->segment[segmentIdx]; | |
2124 | ||
2125 | if (memMap->dir == DMA_TO_DEVICE) { | |
2126 | srcPhysAddr = segment->physAddr; | |
2127 | dstPhysAddr = devPhysAddr; | |
2128 | } else { | |
2129 | srcPhysAddr = devPhysAddr; | |
2130 | dstPhysAddr = segment->physAddr; | |
2131 | } | |
2132 | ||
2133 | rc = | |
2134 | dma_calculate_descriptor_count(dev, srcPhysAddr, | |
2135 | dstPhysAddr, | |
2136 | segment-> | |
2137 | numBytes); | |
2138 | if (rc < 0) { | |
2139 | printk(KERN_ERR | |
2140 | "%s: dma_calculate_descriptor_count failed: %d\n", | |
2141 | __func__, rc); | |
2142 | goto out; | |
2143 | } | |
2144 | numDescriptors += rc; | |
2145 | } | |
2146 | } | |
2147 | ||
2148 | /* Adjust the size of the ring, if it isn't big enough */ | |
2149 | ||
2150 | if (numDescriptors > devAttr->ring.descriptorsAllocated) { | |
2151 | dma_free_descriptor_ring(&devAttr->ring); | |
2152 | rc = | |
2153 | dma_alloc_descriptor_ring(&devAttr->ring, | |
2154 | numDescriptors); | |
2155 | if (rc < 0) { | |
2156 | printk(KERN_ERR | |
2157 | "%s: dma_alloc_descriptor_ring failed: %d\n", | |
2158 | __func__, rc); | |
2159 | goto out; | |
2160 | } | |
2161 | } else { | |
2162 | rc = | |
2163 | dma_init_descriptor_ring(&devAttr->ring, | |
2164 | numDescriptors); | |
2165 | if (rc < 0) { | |
2166 | printk(KERN_ERR | |
2167 | "%s: dma_init_descriptor_ring failed: %d\n", | |
2168 | __func__, rc); | |
2169 | goto out; | |
2170 | } | |
2171 | } | |
2172 | ||
2173 | /* Populate the descriptors */ | |
2174 | ||
2175 | for (regionIdx = 0; regionIdx < memMap->numRegionsUsed; regionIdx++) { | |
2176 | region = &memMap->region[regionIdx]; | |
2177 | ||
2178 | for (segmentIdx = 0; segmentIdx < region->numSegmentsUsed; | |
2179 | segmentIdx++) { | |
2180 | segment = ®ion->segment[segmentIdx]; | |
2181 | ||
2182 | if (memMap->dir == DMA_TO_DEVICE) { | |
2183 | srcPhysAddr = segment->physAddr; | |
2184 | dstPhysAddr = devPhysAddr; | |
2185 | } else { | |
2186 | srcPhysAddr = devPhysAddr; | |
2187 | dstPhysAddr = segment->physAddr; | |
2188 | } | |
2189 | ||
2190 | rc = | |
2191 | dma_add_descriptors(&devAttr->ring, dev, | |
2192 | srcPhysAddr, dstPhysAddr, | |
2193 | segment->numBytes); | |
2194 | if (rc < 0) { | |
2195 | printk(KERN_ERR | |
2196 | "%s: dma_add_descriptors failed: %d\n", | |
2197 | __func__, rc); | |
2198 | goto out; | |
2199 | } | |
2200 | } | |
2201 | } | |
2202 | ||
2203 | rc = 0; | |
2204 | ||
2205 | out: | |
2206 | ||
2207 | up(&memMap->lock); | |
2208 | return rc; | |
2209 | } | |
2210 | ||
2211 | EXPORT_SYMBOL(dma_map_create_descriptor_ring); | |
2212 | ||
2213 | /****************************************************************************/ | |
2214 | /** | |
2215 | * Maps in a memory region such that it can be used for performing a DMA. | |
2216 | * | |
2217 | * @return | |
2218 | */ | |
2219 | /****************************************************************************/ | |
2220 | ||
2221 | int dma_unmap(DMA_MemMap_t *memMap, /* Stores state information about the map */ | |
2222 | int dirtied /* non-zero if any of the pages were modified */ | |
2223 | ) { | |
76708ab8 LC |
2224 | |
2225 | int rc = 0; | |
859277f7 LC |
2226 | int regionIdx; |
2227 | int segmentIdx; | |
2228 | DMA_Region_t *region; | |
2229 | DMA_Segment_t *segment; | |
2230 | ||
76708ab8 LC |
2231 | down(&memMap->lock); |
2232 | ||
859277f7 LC |
2233 | for (regionIdx = 0; regionIdx < memMap->numRegionsUsed; regionIdx++) { |
2234 | region = &memMap->region[regionIdx]; | |
2235 | ||
2236 | for (segmentIdx = 0; segmentIdx < region->numSegmentsUsed; | |
2237 | segmentIdx++) { | |
2238 | segment = ®ion->segment[segmentIdx]; | |
2239 | ||
2240 | switch (region->memType) { | |
2241 | case DMA_MEM_TYPE_VMALLOC: | |
2242 | { | |
2243 | printk(KERN_ERR | |
2244 | "%s: vmalloc'd pages are not yet supported\n", | |
2245 | __func__); | |
76708ab8 LC |
2246 | rc = -EINVAL; |
2247 | goto out; | |
859277f7 LC |
2248 | } |
2249 | ||
2250 | case DMA_MEM_TYPE_KMALLOC: | |
2251 | { | |
2252 | #if ALLOW_MAP_OF_KMALLOC_MEMORY | |
2253 | dma_unmap_single(NULL, | |
2254 | segment->physAddr, | |
2255 | segment->numBytes, | |
2256 | memMap->dir); | |
2257 | #endif | |
2258 | break; | |
2259 | } | |
2260 | ||
2261 | case DMA_MEM_TYPE_DMA: | |
2262 | { | |
2263 | dma_sync_single_for_cpu(NULL, | |
2264 | segment-> | |
2265 | physAddr, | |
2266 | segment-> | |
2267 | numBytes, | |
2268 | memMap->dir); | |
2269 | break; | |
2270 | } | |
2271 | ||
2272 | case DMA_MEM_TYPE_USER: | |
2273 | { | |
2274 | /* Nothing to do here. */ | |
2275 | ||
2276 | break; | |
2277 | } | |
2278 | ||
2279 | default: | |
2280 | { | |
2281 | printk(KERN_ERR | |
2282 | "%s: Unsupported memory type: %d\n", | |
2283 | __func__, region->memType); | |
76708ab8 LC |
2284 | rc = -EINVAL; |
2285 | goto out; | |
859277f7 LC |
2286 | } |
2287 | } | |
2288 | ||
2289 | segment->virtAddr = NULL; | |
2290 | segment->physAddr = 0; | |
2291 | segment->numBytes = 0; | |
2292 | } | |
2293 | ||
2294 | if (region->numLockedPages > 0) { | |
2295 | int pageIdx; | |
2296 | ||
2297 | /* Some user pages were locked. We need to go and unlock them now. */ | |
2298 | ||
2299 | for (pageIdx = 0; pageIdx < region->numLockedPages; | |
2300 | pageIdx++) { | |
2301 | struct page *page = | |
2302 | region->lockedPages[pageIdx]; | |
2303 | ||
2304 | if (memMap->dir == DMA_FROM_DEVICE) { | |
2305 | SetPageDirty(page); | |
2306 | } | |
2307 | page_cache_release(page); | |
2308 | } | |
2309 | kfree(region->lockedPages); | |
2310 | region->numLockedPages = 0; | |
2311 | region->lockedPages = NULL; | |
2312 | } | |
2313 | ||
2314 | region->memType = DMA_MEM_TYPE_NONE; | |
2315 | region->virtAddr = NULL; | |
2316 | region->numBytes = 0; | |
2317 | region->numSegmentsUsed = 0; | |
2318 | } | |
2319 | memMap->userTask = NULL; | |
2320 | memMap->numRegionsUsed = 0; | |
2321 | memMap->inUse = 0; | |
2322 | ||
76708ab8 | 2323 | out: |
859277f7 LC |
2324 | up(&memMap->lock); |
2325 | ||
76708ab8 | 2326 | return rc; |
859277f7 LC |
2327 | } |
2328 | ||
2329 | EXPORT_SYMBOL(dma_unmap); |