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173acc7c ZW |
1 | /* |
2 | * Freescale MPC85xx, MPC83xx DMA Engine support | |
3 | * | |
4 | * Copyright (C) 2007 Freescale Semiconductor, Inc. All rights reserved. | |
5 | * | |
6 | * Author: | |
7 | * Zhang Wei <wei.zhang@freescale.com>, Jul 2007 | |
8 | * Ebony Zhu <ebony.zhu@freescale.com>, May 2007 | |
9 | * | |
10 | * Description: | |
11 | * DMA engine driver for Freescale MPC8540 DMA controller, which is | |
12 | * also fit for MPC8560, MPC8555, MPC8548, MPC8641, and etc. | |
13 | * The support for MPC8349 DMA contorller is also added. | |
14 | * | |
15 | * This is free software; you can redistribute it and/or modify | |
16 | * it under the terms of the GNU General Public License as published by | |
17 | * the Free Software Foundation; either version 2 of the License, or | |
18 | * (at your option) any later version. | |
19 | * | |
20 | */ | |
21 | ||
22 | #include <linux/init.h> | |
23 | #include <linux/module.h> | |
24 | #include <linux/pci.h> | |
25 | #include <linux/interrupt.h> | |
26 | #include <linux/dmaengine.h> | |
27 | #include <linux/delay.h> | |
28 | #include <linux/dma-mapping.h> | |
29 | #include <linux/dmapool.h> | |
30 | #include <linux/of_platform.h> | |
31 | ||
32 | #include "fsldma.h" | |
33 | ||
34 | static void dma_init(struct fsl_dma_chan *fsl_chan) | |
35 | { | |
36 | /* Reset the channel */ | |
37 | DMA_OUT(fsl_chan, &fsl_chan->reg_base->mr, 0, 32); | |
38 | ||
39 | switch (fsl_chan->feature & FSL_DMA_IP_MASK) { | |
40 | case FSL_DMA_IP_85XX: | |
41 | /* Set the channel to below modes: | |
42 | * EIE - Error interrupt enable | |
43 | * EOSIE - End of segments interrupt enable (basic mode) | |
44 | * EOLNIE - End of links interrupt enable | |
45 | */ | |
46 | DMA_OUT(fsl_chan, &fsl_chan->reg_base->mr, FSL_DMA_MR_EIE | |
47 | | FSL_DMA_MR_EOLNIE | FSL_DMA_MR_EOSIE, 32); | |
48 | break; | |
49 | case FSL_DMA_IP_83XX: | |
50 | /* Set the channel to below modes: | |
51 | * EOTIE - End-of-transfer interrupt enable | |
52 | */ | |
53 | DMA_OUT(fsl_chan, &fsl_chan->reg_base->mr, FSL_DMA_MR_EOTIE, | |
54 | 32); | |
55 | break; | |
56 | } | |
57 | ||
58 | } | |
59 | ||
56822843 | 60 | static void set_sr(struct fsl_dma_chan *fsl_chan, u32 val) |
173acc7c ZW |
61 | { |
62 | DMA_OUT(fsl_chan, &fsl_chan->reg_base->sr, val, 32); | |
63 | } | |
64 | ||
56822843 | 65 | static u32 get_sr(struct fsl_dma_chan *fsl_chan) |
173acc7c ZW |
66 | { |
67 | return DMA_IN(fsl_chan, &fsl_chan->reg_base->sr, 32); | |
68 | } | |
69 | ||
70 | static void set_desc_cnt(struct fsl_dma_chan *fsl_chan, | |
71 | struct fsl_dma_ld_hw *hw, u32 count) | |
72 | { | |
73 | hw->count = CPU_TO_DMA(fsl_chan, count, 32); | |
74 | } | |
75 | ||
76 | static void set_desc_src(struct fsl_dma_chan *fsl_chan, | |
77 | struct fsl_dma_ld_hw *hw, dma_addr_t src) | |
78 | { | |
79 | u64 snoop_bits; | |
80 | ||
81 | snoop_bits = ((fsl_chan->feature & FSL_DMA_IP_MASK) == FSL_DMA_IP_85XX) | |
82 | ? ((u64)FSL_DMA_SATR_SREADTYPE_SNOOP_READ << 32) : 0; | |
83 | hw->src_addr = CPU_TO_DMA(fsl_chan, snoop_bits | src, 64); | |
84 | } | |
85 | ||
86 | static void set_desc_dest(struct fsl_dma_chan *fsl_chan, | |
87 | struct fsl_dma_ld_hw *hw, dma_addr_t dest) | |
88 | { | |
89 | u64 snoop_bits; | |
90 | ||
91 | snoop_bits = ((fsl_chan->feature & FSL_DMA_IP_MASK) == FSL_DMA_IP_85XX) | |
92 | ? ((u64)FSL_DMA_DATR_DWRITETYPE_SNOOP_WRITE << 32) : 0; | |
93 | hw->dst_addr = CPU_TO_DMA(fsl_chan, snoop_bits | dest, 64); | |
94 | } | |
95 | ||
96 | static void set_desc_next(struct fsl_dma_chan *fsl_chan, | |
97 | struct fsl_dma_ld_hw *hw, dma_addr_t next) | |
98 | { | |
99 | u64 snoop_bits; | |
100 | ||
101 | snoop_bits = ((fsl_chan->feature & FSL_DMA_IP_MASK) == FSL_DMA_IP_83XX) | |
102 | ? FSL_DMA_SNEN : 0; | |
103 | hw->next_ln_addr = CPU_TO_DMA(fsl_chan, snoop_bits | next, 64); | |
104 | } | |
105 | ||
106 | static void set_cdar(struct fsl_dma_chan *fsl_chan, dma_addr_t addr) | |
107 | { | |
108 | DMA_OUT(fsl_chan, &fsl_chan->reg_base->cdar, addr | FSL_DMA_SNEN, 64); | |
109 | } | |
110 | ||
111 | static dma_addr_t get_cdar(struct fsl_dma_chan *fsl_chan) | |
112 | { | |
113 | return DMA_IN(fsl_chan, &fsl_chan->reg_base->cdar, 64) & ~FSL_DMA_SNEN; | |
114 | } | |
115 | ||
116 | static void set_ndar(struct fsl_dma_chan *fsl_chan, dma_addr_t addr) | |
117 | { | |
118 | DMA_OUT(fsl_chan, &fsl_chan->reg_base->ndar, addr, 64); | |
119 | } | |
120 | ||
121 | static dma_addr_t get_ndar(struct fsl_dma_chan *fsl_chan) | |
122 | { | |
123 | return DMA_IN(fsl_chan, &fsl_chan->reg_base->ndar, 64); | |
124 | } | |
125 | ||
126 | static int dma_is_idle(struct fsl_dma_chan *fsl_chan) | |
127 | { | |
128 | u32 sr = get_sr(fsl_chan); | |
129 | return (!(sr & FSL_DMA_SR_CB)) || (sr & FSL_DMA_SR_CH); | |
130 | } | |
131 | ||
132 | static void dma_start(struct fsl_dma_chan *fsl_chan) | |
133 | { | |
134 | u32 mr_set = 0;; | |
135 | ||
136 | if (fsl_chan->feature & FSL_DMA_CHAN_PAUSE_EXT) { | |
137 | DMA_OUT(fsl_chan, &fsl_chan->reg_base->bcr, 0, 32); | |
138 | mr_set |= FSL_DMA_MR_EMP_EN; | |
139 | } else | |
140 | DMA_OUT(fsl_chan, &fsl_chan->reg_base->mr, | |
141 | DMA_IN(fsl_chan, &fsl_chan->reg_base->mr, 32) | |
142 | & ~FSL_DMA_MR_EMP_EN, 32); | |
143 | ||
144 | if (fsl_chan->feature & FSL_DMA_CHAN_START_EXT) | |
145 | mr_set |= FSL_DMA_MR_EMS_EN; | |
146 | else | |
147 | mr_set |= FSL_DMA_MR_CS; | |
148 | ||
149 | DMA_OUT(fsl_chan, &fsl_chan->reg_base->mr, | |
150 | DMA_IN(fsl_chan, &fsl_chan->reg_base->mr, 32) | |
151 | | mr_set, 32); | |
152 | } | |
153 | ||
154 | static void dma_halt(struct fsl_dma_chan *fsl_chan) | |
155 | { | |
156 | int i = 0; | |
157 | DMA_OUT(fsl_chan, &fsl_chan->reg_base->mr, | |
158 | DMA_IN(fsl_chan, &fsl_chan->reg_base->mr, 32) | FSL_DMA_MR_CA, | |
159 | 32); | |
160 | DMA_OUT(fsl_chan, &fsl_chan->reg_base->mr, | |
161 | DMA_IN(fsl_chan, &fsl_chan->reg_base->mr, 32) & ~(FSL_DMA_MR_CS | |
162 | | FSL_DMA_MR_EMS_EN | FSL_DMA_MR_CA), 32); | |
163 | ||
164 | while (!dma_is_idle(fsl_chan) && (i++ < 100)) | |
165 | udelay(10); | |
166 | if (i >= 100 && !dma_is_idle(fsl_chan)) | |
167 | dev_err(fsl_chan->dev, "DMA halt timeout!\n"); | |
168 | } | |
169 | ||
170 | static void set_ld_eol(struct fsl_dma_chan *fsl_chan, | |
171 | struct fsl_desc_sw *desc) | |
172 | { | |
173 | desc->hw.next_ln_addr = CPU_TO_DMA(fsl_chan, | |
174 | DMA_TO_CPU(fsl_chan, desc->hw.next_ln_addr, 64) | FSL_DMA_EOL, | |
175 | 64); | |
176 | } | |
177 | ||
178 | static void append_ld_queue(struct fsl_dma_chan *fsl_chan, | |
179 | struct fsl_desc_sw *new_desc) | |
180 | { | |
181 | struct fsl_desc_sw *queue_tail = to_fsl_desc(fsl_chan->ld_queue.prev); | |
182 | ||
183 | if (list_empty(&fsl_chan->ld_queue)) | |
184 | return; | |
185 | ||
186 | /* Link to the new descriptor physical address and | |
187 | * Enable End-of-segment interrupt for | |
188 | * the last link descriptor. | |
189 | * (the previous node's next link descriptor) | |
190 | * | |
191 | * For FSL_DMA_IP_83xx, the snoop enable bit need be set. | |
192 | */ | |
193 | queue_tail->hw.next_ln_addr = CPU_TO_DMA(fsl_chan, | |
194 | new_desc->async_tx.phys | FSL_DMA_EOSIE | | |
195 | (((fsl_chan->feature & FSL_DMA_IP_MASK) | |
196 | == FSL_DMA_IP_83XX) ? FSL_DMA_SNEN : 0), 64); | |
197 | } | |
198 | ||
199 | /** | |
200 | * fsl_chan_set_src_loop_size - Set source address hold transfer size | |
201 | * @fsl_chan : Freescale DMA channel | |
202 | * @size : Address loop size, 0 for disable loop | |
203 | * | |
204 | * The set source address hold transfer size. The source | |
205 | * address hold or loop transfer size is when the DMA transfer | |
206 | * data from source address (SA), if the loop size is 4, the DMA will | |
207 | * read data from SA, SA + 1, SA + 2, SA + 3, then loop back to SA, | |
208 | * SA + 1 ... and so on. | |
209 | */ | |
210 | static void fsl_chan_set_src_loop_size(struct fsl_dma_chan *fsl_chan, int size) | |
211 | { | |
212 | switch (size) { | |
213 | case 0: | |
214 | DMA_OUT(fsl_chan, &fsl_chan->reg_base->mr, | |
215 | DMA_IN(fsl_chan, &fsl_chan->reg_base->mr, 32) & | |
216 | (~FSL_DMA_MR_SAHE), 32); | |
217 | break; | |
218 | case 1: | |
219 | case 2: | |
220 | case 4: | |
221 | case 8: | |
222 | DMA_OUT(fsl_chan, &fsl_chan->reg_base->mr, | |
223 | DMA_IN(fsl_chan, &fsl_chan->reg_base->mr, 32) | | |
224 | FSL_DMA_MR_SAHE | (__ilog2(size) << 14), | |
225 | 32); | |
226 | break; | |
227 | } | |
228 | } | |
229 | ||
230 | /** | |
231 | * fsl_chan_set_dest_loop_size - Set destination address hold transfer size | |
232 | * @fsl_chan : Freescale DMA channel | |
233 | * @size : Address loop size, 0 for disable loop | |
234 | * | |
235 | * The set destination address hold transfer size. The destination | |
236 | * address hold or loop transfer size is when the DMA transfer | |
237 | * data to destination address (TA), if the loop size is 4, the DMA will | |
238 | * write data to TA, TA + 1, TA + 2, TA + 3, then loop back to TA, | |
239 | * TA + 1 ... and so on. | |
240 | */ | |
241 | static void fsl_chan_set_dest_loop_size(struct fsl_dma_chan *fsl_chan, int size) | |
242 | { | |
243 | switch (size) { | |
244 | case 0: | |
245 | DMA_OUT(fsl_chan, &fsl_chan->reg_base->mr, | |
246 | DMA_IN(fsl_chan, &fsl_chan->reg_base->mr, 32) & | |
247 | (~FSL_DMA_MR_DAHE), 32); | |
248 | break; | |
249 | case 1: | |
250 | case 2: | |
251 | case 4: | |
252 | case 8: | |
253 | DMA_OUT(fsl_chan, &fsl_chan->reg_base->mr, | |
254 | DMA_IN(fsl_chan, &fsl_chan->reg_base->mr, 32) | | |
255 | FSL_DMA_MR_DAHE | (__ilog2(size) << 16), | |
256 | 32); | |
257 | break; | |
258 | } | |
259 | } | |
260 | ||
261 | /** | |
262 | * fsl_chan_toggle_ext_pause - Toggle channel external pause status | |
263 | * @fsl_chan : Freescale DMA channel | |
264 | * @size : Pause control size, 0 for disable external pause control. | |
265 | * The maximum is 1024. | |
266 | * | |
267 | * The Freescale DMA channel can be controlled by the external | |
268 | * signal DREQ#. The pause control size is how many bytes are allowed | |
269 | * to transfer before pausing the channel, after which a new assertion | |
270 | * of DREQ# resumes channel operation. | |
271 | */ | |
272 | static void fsl_chan_toggle_ext_pause(struct fsl_dma_chan *fsl_chan, int size) | |
273 | { | |
274 | if (size > 1024) | |
275 | return; | |
276 | ||
277 | if (size) { | |
278 | DMA_OUT(fsl_chan, &fsl_chan->reg_base->mr, | |
279 | DMA_IN(fsl_chan, &fsl_chan->reg_base->mr, 32) | |
280 | | ((__ilog2(size) << 24) & 0x0f000000), | |
281 | 32); | |
282 | fsl_chan->feature |= FSL_DMA_CHAN_PAUSE_EXT; | |
283 | } else | |
284 | fsl_chan->feature &= ~FSL_DMA_CHAN_PAUSE_EXT; | |
285 | } | |
286 | ||
287 | /** | |
288 | * fsl_chan_toggle_ext_start - Toggle channel external start status | |
289 | * @fsl_chan : Freescale DMA channel | |
290 | * @enable : 0 is disabled, 1 is enabled. | |
291 | * | |
292 | * If enable the external start, the channel can be started by an | |
293 | * external DMA start pin. So the dma_start() does not start the | |
294 | * transfer immediately. The DMA channel will wait for the | |
295 | * control pin asserted. | |
296 | */ | |
297 | static void fsl_chan_toggle_ext_start(struct fsl_dma_chan *fsl_chan, int enable) | |
298 | { | |
299 | if (enable) | |
300 | fsl_chan->feature |= FSL_DMA_CHAN_START_EXT; | |
301 | else | |
302 | fsl_chan->feature &= ~FSL_DMA_CHAN_START_EXT; | |
303 | } | |
304 | ||
305 | static dma_cookie_t fsl_dma_tx_submit(struct dma_async_tx_descriptor *tx) | |
306 | { | |
307 | struct fsl_desc_sw *desc = tx_to_fsl_desc(tx); | |
308 | struct fsl_dma_chan *fsl_chan = to_fsl_chan(tx->chan); | |
309 | unsigned long flags; | |
310 | dma_cookie_t cookie; | |
311 | ||
312 | /* cookie increment and adding to ld_queue must be atomic */ | |
313 | spin_lock_irqsave(&fsl_chan->desc_lock, flags); | |
314 | ||
315 | cookie = fsl_chan->common.cookie; | |
316 | cookie++; | |
317 | if (cookie < 0) | |
318 | cookie = 1; | |
319 | desc->async_tx.cookie = cookie; | |
320 | fsl_chan->common.cookie = desc->async_tx.cookie; | |
321 | ||
322 | append_ld_queue(fsl_chan, desc); | |
323 | list_splice_init(&desc->async_tx.tx_list, fsl_chan->ld_queue.prev); | |
324 | ||
325 | spin_unlock_irqrestore(&fsl_chan->desc_lock, flags); | |
326 | ||
327 | return cookie; | |
328 | } | |
329 | ||
330 | /** | |
331 | * fsl_dma_alloc_descriptor - Allocate descriptor from channel's DMA pool. | |
332 | * @fsl_chan : Freescale DMA channel | |
333 | * | |
334 | * Return - The descriptor allocated. NULL for failed. | |
335 | */ | |
336 | static struct fsl_desc_sw *fsl_dma_alloc_descriptor( | |
337 | struct fsl_dma_chan *fsl_chan) | |
338 | { | |
339 | dma_addr_t pdesc; | |
340 | struct fsl_desc_sw *desc_sw; | |
341 | ||
342 | desc_sw = dma_pool_alloc(fsl_chan->desc_pool, GFP_ATOMIC, &pdesc); | |
343 | if (desc_sw) { | |
344 | memset(desc_sw, 0, sizeof(struct fsl_desc_sw)); | |
345 | dma_async_tx_descriptor_init(&desc_sw->async_tx, | |
346 | &fsl_chan->common); | |
347 | desc_sw->async_tx.tx_submit = fsl_dma_tx_submit; | |
348 | INIT_LIST_HEAD(&desc_sw->async_tx.tx_list); | |
349 | desc_sw->async_tx.phys = pdesc; | |
350 | } | |
351 | ||
352 | return desc_sw; | |
353 | } | |
354 | ||
355 | ||
356 | /** | |
357 | * fsl_dma_alloc_chan_resources - Allocate resources for DMA channel. | |
358 | * @fsl_chan : Freescale DMA channel | |
359 | * | |
360 | * This function will create a dma pool for descriptor allocation. | |
361 | * | |
362 | * Return - The number of descriptors allocated. | |
363 | */ | |
364 | static int fsl_dma_alloc_chan_resources(struct dma_chan *chan) | |
365 | { | |
366 | struct fsl_dma_chan *fsl_chan = to_fsl_chan(chan); | |
367 | LIST_HEAD(tmp_list); | |
368 | ||
369 | /* We need the descriptor to be aligned to 32bytes | |
370 | * for meeting FSL DMA specification requirement. | |
371 | */ | |
372 | fsl_chan->desc_pool = dma_pool_create("fsl_dma_engine_desc_pool", | |
373 | fsl_chan->dev, sizeof(struct fsl_desc_sw), | |
374 | 32, 0); | |
375 | if (!fsl_chan->desc_pool) { | |
376 | dev_err(fsl_chan->dev, "No memory for channel %d " | |
377 | "descriptor dma pool.\n", fsl_chan->id); | |
378 | return 0; | |
379 | } | |
380 | ||
381 | return 1; | |
382 | } | |
383 | ||
384 | /** | |
385 | * fsl_dma_free_chan_resources - Free all resources of the channel. | |
386 | * @fsl_chan : Freescale DMA channel | |
387 | */ | |
388 | static void fsl_dma_free_chan_resources(struct dma_chan *chan) | |
389 | { | |
390 | struct fsl_dma_chan *fsl_chan = to_fsl_chan(chan); | |
391 | struct fsl_desc_sw *desc, *_desc; | |
392 | unsigned long flags; | |
393 | ||
394 | dev_dbg(fsl_chan->dev, "Free all channel resources.\n"); | |
395 | spin_lock_irqsave(&fsl_chan->desc_lock, flags); | |
396 | list_for_each_entry_safe(desc, _desc, &fsl_chan->ld_queue, node) { | |
397 | #ifdef FSL_DMA_LD_DEBUG | |
398 | dev_dbg(fsl_chan->dev, | |
399 | "LD %p will be released.\n", desc); | |
400 | #endif | |
401 | list_del(&desc->node); | |
402 | /* free link descriptor */ | |
403 | dma_pool_free(fsl_chan->desc_pool, desc, desc->async_tx.phys); | |
404 | } | |
405 | spin_unlock_irqrestore(&fsl_chan->desc_lock, flags); | |
406 | dma_pool_destroy(fsl_chan->desc_pool); | |
407 | } | |
408 | ||
2187c269 ZW |
409 | static struct dma_async_tx_descriptor * |
410 | fsl_dma_prep_interrupt(struct dma_chan *chan) | |
411 | { | |
412 | struct fsl_dma_chan *fsl_chan; | |
413 | struct fsl_desc_sw *new; | |
414 | ||
415 | if (!chan) | |
416 | return NULL; | |
417 | ||
418 | fsl_chan = to_fsl_chan(chan); | |
419 | ||
420 | new = fsl_dma_alloc_descriptor(fsl_chan); | |
421 | if (!new) { | |
422 | dev_err(fsl_chan->dev, "No free memory for link descriptor\n"); | |
423 | return NULL; | |
424 | } | |
425 | ||
426 | new->async_tx.cookie = -EBUSY; | |
427 | new->async_tx.ack = 0; | |
428 | ||
429 | /* Set End-of-link to the last link descriptor of new list*/ | |
430 | set_ld_eol(fsl_chan, new); | |
431 | ||
432 | return &new->async_tx; | |
433 | } | |
434 | ||
173acc7c ZW |
435 | static struct dma_async_tx_descriptor *fsl_dma_prep_memcpy( |
436 | struct dma_chan *chan, dma_addr_t dma_dest, dma_addr_t dma_src, | |
437 | size_t len, unsigned long flags) | |
438 | { | |
439 | struct fsl_dma_chan *fsl_chan; | |
440 | struct fsl_desc_sw *first = NULL, *prev = NULL, *new; | |
441 | size_t copy; | |
442 | LIST_HEAD(link_chain); | |
443 | ||
444 | if (!chan) | |
445 | return NULL; | |
446 | ||
447 | if (!len) | |
448 | return NULL; | |
449 | ||
450 | fsl_chan = to_fsl_chan(chan); | |
451 | ||
452 | do { | |
453 | ||
454 | /* Allocate the link descriptor from DMA pool */ | |
455 | new = fsl_dma_alloc_descriptor(fsl_chan); | |
456 | if (!new) { | |
457 | dev_err(fsl_chan->dev, | |
458 | "No free memory for link descriptor\n"); | |
459 | return NULL; | |
460 | } | |
461 | #ifdef FSL_DMA_LD_DEBUG | |
462 | dev_dbg(fsl_chan->dev, "new link desc alloc %p\n", new); | |
463 | #endif | |
464 | ||
56822843 | 465 | copy = min(len, (size_t)FSL_DMA_BCR_MAX_CNT); |
173acc7c ZW |
466 | |
467 | set_desc_cnt(fsl_chan, &new->hw, copy); | |
468 | set_desc_src(fsl_chan, &new->hw, dma_src); | |
469 | set_desc_dest(fsl_chan, &new->hw, dma_dest); | |
470 | ||
471 | if (!first) | |
472 | first = new; | |
473 | else | |
474 | set_desc_next(fsl_chan, &prev->hw, new->async_tx.phys); | |
475 | ||
476 | new->async_tx.cookie = 0; | |
477 | new->async_tx.ack = 1; | |
478 | ||
479 | prev = new; | |
480 | len -= copy; | |
481 | dma_src += copy; | |
482 | dma_dest += copy; | |
483 | ||
484 | /* Insert the link descriptor to the LD ring */ | |
485 | list_add_tail(&new->node, &first->async_tx.tx_list); | |
486 | } while (len); | |
487 | ||
488 | new->async_tx.ack = 0; /* client is in control of this ack */ | |
489 | new->async_tx.cookie = -EBUSY; | |
490 | ||
491 | /* Set End-of-link to the last link descriptor of new list*/ | |
492 | set_ld_eol(fsl_chan, new); | |
493 | ||
494 | return first ? &first->async_tx : NULL; | |
495 | } | |
496 | ||
497 | /** | |
498 | * fsl_dma_update_completed_cookie - Update the completed cookie. | |
499 | * @fsl_chan : Freescale DMA channel | |
500 | */ | |
501 | static void fsl_dma_update_completed_cookie(struct fsl_dma_chan *fsl_chan) | |
502 | { | |
503 | struct fsl_desc_sw *cur_desc, *desc; | |
504 | dma_addr_t ld_phy; | |
505 | ||
506 | ld_phy = get_cdar(fsl_chan) & FSL_DMA_NLDA_MASK; | |
507 | ||
508 | if (ld_phy) { | |
509 | cur_desc = NULL; | |
510 | list_for_each_entry(desc, &fsl_chan->ld_queue, node) | |
511 | if (desc->async_tx.phys == ld_phy) { | |
512 | cur_desc = desc; | |
513 | break; | |
514 | } | |
515 | ||
516 | if (cur_desc && cur_desc->async_tx.cookie) { | |
517 | if (dma_is_idle(fsl_chan)) | |
518 | fsl_chan->completed_cookie = | |
519 | cur_desc->async_tx.cookie; | |
520 | else | |
521 | fsl_chan->completed_cookie = | |
522 | cur_desc->async_tx.cookie - 1; | |
523 | } | |
524 | } | |
525 | } | |
526 | ||
527 | /** | |
528 | * fsl_chan_ld_cleanup - Clean up link descriptors | |
529 | * @fsl_chan : Freescale DMA channel | |
530 | * | |
531 | * This function clean up the ld_queue of DMA channel. | |
532 | * If 'in_intr' is set, the function will move the link descriptor to | |
533 | * the recycle list. Otherwise, free it directly. | |
534 | */ | |
535 | static void fsl_chan_ld_cleanup(struct fsl_dma_chan *fsl_chan) | |
536 | { | |
537 | struct fsl_desc_sw *desc, *_desc; | |
538 | unsigned long flags; | |
539 | ||
540 | spin_lock_irqsave(&fsl_chan->desc_lock, flags); | |
541 | ||
173acc7c ZW |
542 | dev_dbg(fsl_chan->dev, "chan completed_cookie = %d\n", |
543 | fsl_chan->completed_cookie); | |
544 | list_for_each_entry_safe(desc, _desc, &fsl_chan->ld_queue, node) { | |
545 | dma_async_tx_callback callback; | |
546 | void *callback_param; | |
547 | ||
548 | if (dma_async_is_complete(desc->async_tx.cookie, | |
549 | fsl_chan->completed_cookie, fsl_chan->common.cookie) | |
550 | == DMA_IN_PROGRESS) | |
551 | break; | |
552 | ||
553 | callback = desc->async_tx.callback; | |
554 | callback_param = desc->async_tx.callback_param; | |
555 | ||
556 | /* Remove from ld_queue list */ | |
557 | list_del(&desc->node); | |
558 | ||
559 | dev_dbg(fsl_chan->dev, "link descriptor %p will be recycle.\n", | |
560 | desc); | |
561 | dma_pool_free(fsl_chan->desc_pool, desc, desc->async_tx.phys); | |
562 | ||
563 | /* Run the link descriptor callback function */ | |
564 | if (callback) { | |
565 | spin_unlock_irqrestore(&fsl_chan->desc_lock, flags); | |
566 | dev_dbg(fsl_chan->dev, "link descriptor %p callback\n", | |
567 | desc); | |
568 | callback(callback_param); | |
569 | spin_lock_irqsave(&fsl_chan->desc_lock, flags); | |
570 | } | |
571 | } | |
572 | spin_unlock_irqrestore(&fsl_chan->desc_lock, flags); | |
573 | } | |
574 | ||
575 | /** | |
576 | * fsl_chan_xfer_ld_queue - Transfer link descriptors in channel ld_queue. | |
577 | * @fsl_chan : Freescale DMA channel | |
578 | */ | |
579 | static void fsl_chan_xfer_ld_queue(struct fsl_dma_chan *fsl_chan) | |
580 | { | |
581 | struct list_head *ld_node; | |
582 | dma_addr_t next_dest_addr; | |
583 | unsigned long flags; | |
584 | ||
585 | if (!dma_is_idle(fsl_chan)) | |
586 | return; | |
587 | ||
588 | dma_halt(fsl_chan); | |
589 | ||
590 | /* If there are some link descriptors | |
591 | * not transfered in queue. We need to start it. | |
592 | */ | |
593 | spin_lock_irqsave(&fsl_chan->desc_lock, flags); | |
594 | ||
595 | /* Find the first un-transfer desciptor */ | |
596 | for (ld_node = fsl_chan->ld_queue.next; | |
597 | (ld_node != &fsl_chan->ld_queue) | |
598 | && (dma_async_is_complete( | |
599 | to_fsl_desc(ld_node)->async_tx.cookie, | |
600 | fsl_chan->completed_cookie, | |
601 | fsl_chan->common.cookie) == DMA_SUCCESS); | |
602 | ld_node = ld_node->next); | |
603 | ||
604 | spin_unlock_irqrestore(&fsl_chan->desc_lock, flags); | |
605 | ||
606 | if (ld_node != &fsl_chan->ld_queue) { | |
607 | /* Get the ld start address from ld_queue */ | |
608 | next_dest_addr = to_fsl_desc(ld_node)->async_tx.phys; | |
56822843 ZW |
609 | dev_dbg(fsl_chan->dev, "xfer LDs staring from %p\n", |
610 | (void *)next_dest_addr); | |
173acc7c ZW |
611 | set_cdar(fsl_chan, next_dest_addr); |
612 | dma_start(fsl_chan); | |
613 | } else { | |
614 | set_cdar(fsl_chan, 0); | |
615 | set_ndar(fsl_chan, 0); | |
616 | } | |
617 | } | |
618 | ||
619 | /** | |
620 | * fsl_dma_memcpy_issue_pending - Issue the DMA start command | |
621 | * @fsl_chan : Freescale DMA channel | |
622 | */ | |
623 | static void fsl_dma_memcpy_issue_pending(struct dma_chan *chan) | |
624 | { | |
625 | struct fsl_dma_chan *fsl_chan = to_fsl_chan(chan); | |
626 | ||
627 | #ifdef FSL_DMA_LD_DEBUG | |
628 | struct fsl_desc_sw *ld; | |
629 | unsigned long flags; | |
630 | ||
631 | spin_lock_irqsave(&fsl_chan->desc_lock, flags); | |
632 | if (list_empty(&fsl_chan->ld_queue)) { | |
633 | spin_unlock_irqrestore(&fsl_chan->desc_lock, flags); | |
634 | return; | |
635 | } | |
636 | ||
637 | dev_dbg(fsl_chan->dev, "--memcpy issue--\n"); | |
638 | list_for_each_entry(ld, &fsl_chan->ld_queue, node) { | |
639 | int i; | |
640 | dev_dbg(fsl_chan->dev, "Ch %d, LD %08x\n", | |
641 | fsl_chan->id, ld->async_tx.phys); | |
642 | for (i = 0; i < 8; i++) | |
643 | dev_dbg(fsl_chan->dev, "LD offset %d: %08x\n", | |
644 | i, *(((u32 *)&ld->hw) + i)); | |
645 | } | |
646 | dev_dbg(fsl_chan->dev, "----------------\n"); | |
647 | spin_unlock_irqrestore(&fsl_chan->desc_lock, flags); | |
648 | #endif | |
649 | ||
650 | fsl_chan_xfer_ld_queue(fsl_chan); | |
651 | } | |
652 | ||
653 | static void fsl_dma_dependency_added(struct dma_chan *chan) | |
654 | { | |
655 | struct fsl_dma_chan *fsl_chan = to_fsl_chan(chan); | |
656 | ||
657 | fsl_chan_ld_cleanup(fsl_chan); | |
658 | } | |
659 | ||
660 | /** | |
661 | * fsl_dma_is_complete - Determine the DMA status | |
662 | * @fsl_chan : Freescale DMA channel | |
663 | */ | |
664 | static enum dma_status fsl_dma_is_complete(struct dma_chan *chan, | |
665 | dma_cookie_t cookie, | |
666 | dma_cookie_t *done, | |
667 | dma_cookie_t *used) | |
668 | { | |
669 | struct fsl_dma_chan *fsl_chan = to_fsl_chan(chan); | |
670 | dma_cookie_t last_used; | |
671 | dma_cookie_t last_complete; | |
672 | ||
673 | fsl_chan_ld_cleanup(fsl_chan); | |
674 | ||
675 | last_used = chan->cookie; | |
676 | last_complete = fsl_chan->completed_cookie; | |
677 | ||
678 | if (done) | |
679 | *done = last_complete; | |
680 | ||
681 | if (used) | |
682 | *used = last_used; | |
683 | ||
684 | return dma_async_is_complete(cookie, last_complete, last_used); | |
685 | } | |
686 | ||
687 | static irqreturn_t fsl_dma_chan_do_interrupt(int irq, void *data) | |
688 | { | |
689 | struct fsl_dma_chan *fsl_chan = (struct fsl_dma_chan *)data; | |
56822843 | 690 | u32 stat; |
173acc7c ZW |
691 | |
692 | stat = get_sr(fsl_chan); | |
693 | dev_dbg(fsl_chan->dev, "event: channel %d, stat = 0x%x\n", | |
694 | fsl_chan->id, stat); | |
695 | set_sr(fsl_chan, stat); /* Clear the event register */ | |
696 | ||
697 | stat &= ~(FSL_DMA_SR_CB | FSL_DMA_SR_CH); | |
698 | if (!stat) | |
699 | return IRQ_NONE; | |
700 | ||
701 | if (stat & FSL_DMA_SR_TE) | |
702 | dev_err(fsl_chan->dev, "Transfer Error!\n"); | |
703 | ||
704 | /* If the link descriptor segment transfer finishes, | |
705 | * we will recycle the used descriptor. | |
706 | */ | |
707 | if (stat & FSL_DMA_SR_EOSI) { | |
708 | dev_dbg(fsl_chan->dev, "event: End-of-segments INT\n"); | |
56822843 ZW |
709 | dev_dbg(fsl_chan->dev, "event: clndar %p, nlndar %p\n", |
710 | (void *)get_cdar(fsl_chan), (void *)get_ndar(fsl_chan)); | |
173acc7c | 711 | stat &= ~FSL_DMA_SR_EOSI; |
9c98718e | 712 | fsl_dma_update_completed_cookie(fsl_chan); |
173acc7c ZW |
713 | } |
714 | ||
715 | /* If it current transfer is the end-of-transfer, | |
716 | * we should clear the Channel Start bit for | |
717 | * prepare next transfer. | |
718 | */ | |
719 | if (stat & (FSL_DMA_SR_EOLNI | FSL_DMA_SR_EOCDI)) { | |
720 | dev_dbg(fsl_chan->dev, "event: End-of-link INT\n"); | |
721 | stat &= ~FSL_DMA_SR_EOLNI; | |
722 | fsl_chan_xfer_ld_queue(fsl_chan); | |
723 | } | |
724 | ||
725 | if (stat) | |
726 | dev_dbg(fsl_chan->dev, "event: unhandled sr 0x%02x\n", | |
727 | stat); | |
728 | ||
729 | dev_dbg(fsl_chan->dev, "event: Exit\n"); | |
730 | tasklet_schedule(&fsl_chan->tasklet); | |
731 | return IRQ_HANDLED; | |
732 | } | |
733 | ||
734 | static irqreturn_t fsl_dma_do_interrupt(int irq, void *data) | |
735 | { | |
736 | struct fsl_dma_device *fdev = (struct fsl_dma_device *)data; | |
737 | u32 gsr; | |
738 | int ch_nr; | |
739 | ||
740 | gsr = (fdev->feature & FSL_DMA_BIG_ENDIAN) ? in_be32(fdev->reg_base) | |
741 | : in_le32(fdev->reg_base); | |
742 | ch_nr = (32 - ffs(gsr)) / 8; | |
743 | ||
744 | return fdev->chan[ch_nr] ? fsl_dma_chan_do_interrupt(irq, | |
745 | fdev->chan[ch_nr]) : IRQ_NONE; | |
746 | } | |
747 | ||
748 | static void dma_do_tasklet(unsigned long data) | |
749 | { | |
750 | struct fsl_dma_chan *fsl_chan = (struct fsl_dma_chan *)data; | |
751 | fsl_chan_ld_cleanup(fsl_chan); | |
752 | } | |
753 | ||
56822843 | 754 | #ifdef FSL_DMA_CALLBACKTEST |
173acc7c ZW |
755 | static void fsl_dma_callback_test(struct fsl_dma_chan *fsl_chan) |
756 | { | |
757 | if (fsl_chan) | |
758 | dev_info(fsl_chan->dev, "selftest: callback is ok!\n"); | |
759 | } | |
56822843 | 760 | #endif |
173acc7c | 761 | |
56822843 | 762 | #ifdef CONFIG_FSL_DMA_SELFTEST |
173acc7c ZW |
763 | static int fsl_dma_self_test(struct fsl_dma_chan *fsl_chan) |
764 | { | |
765 | struct dma_chan *chan; | |
766 | int err = 0; | |
767 | dma_addr_t dma_dest, dma_src; | |
768 | dma_cookie_t cookie; | |
769 | u8 *src, *dest; | |
770 | int i; | |
771 | size_t test_size; | |
772 | struct dma_async_tx_descriptor *tx1, *tx2, *tx3; | |
773 | ||
774 | test_size = 4096; | |
775 | ||
776 | src = kmalloc(test_size * 2, GFP_KERNEL); | |
777 | if (!src) { | |
778 | dev_err(fsl_chan->dev, | |
779 | "selftest: Cannot alloc memory for test!\n"); | |
780 | err = -ENOMEM; | |
781 | goto out; | |
782 | } | |
783 | ||
784 | dest = src + test_size; | |
785 | ||
786 | for (i = 0; i < test_size; i++) | |
787 | src[i] = (u8) i; | |
788 | ||
789 | chan = &fsl_chan->common; | |
790 | ||
791 | if (fsl_dma_alloc_chan_resources(chan) < 1) { | |
792 | dev_err(fsl_chan->dev, | |
793 | "selftest: Cannot alloc resources for DMA\n"); | |
794 | err = -ENODEV; | |
795 | goto out; | |
796 | } | |
797 | ||
798 | /* TX 1 */ | |
799 | dma_src = dma_map_single(fsl_chan->dev, src, test_size / 2, | |
800 | DMA_TO_DEVICE); | |
801 | dma_dest = dma_map_single(fsl_chan->dev, dest, test_size / 2, | |
802 | DMA_FROM_DEVICE); | |
803 | tx1 = fsl_dma_prep_memcpy(chan, dma_dest, dma_src, test_size / 2, 0); | |
804 | async_tx_ack(tx1); | |
805 | ||
806 | cookie = fsl_dma_tx_submit(tx1); | |
807 | fsl_dma_memcpy_issue_pending(chan); | |
808 | msleep(2); | |
809 | ||
810 | if (fsl_dma_is_complete(chan, cookie, NULL, NULL) != DMA_SUCCESS) { | |
811 | dev_err(fsl_chan->dev, "selftest: Time out!\n"); | |
812 | err = -ENODEV; | |
813 | goto out; | |
814 | } | |
815 | ||
816 | /* Test free and re-alloc channel resources */ | |
817 | fsl_dma_free_chan_resources(chan); | |
818 | ||
819 | if (fsl_dma_alloc_chan_resources(chan) < 1) { | |
820 | dev_err(fsl_chan->dev, | |
821 | "selftest: Cannot alloc resources for DMA\n"); | |
822 | err = -ENODEV; | |
823 | goto free_resources; | |
824 | } | |
825 | ||
826 | /* Continue to test | |
827 | * TX 2 | |
828 | */ | |
829 | dma_src = dma_map_single(fsl_chan->dev, src + test_size / 2, | |
830 | test_size / 4, DMA_TO_DEVICE); | |
831 | dma_dest = dma_map_single(fsl_chan->dev, dest + test_size / 2, | |
832 | test_size / 4, DMA_FROM_DEVICE); | |
833 | tx2 = fsl_dma_prep_memcpy(chan, dma_dest, dma_src, test_size / 4, 0); | |
834 | async_tx_ack(tx2); | |
835 | ||
836 | /* TX 3 */ | |
837 | dma_src = dma_map_single(fsl_chan->dev, src + test_size * 3 / 4, | |
838 | test_size / 4, DMA_TO_DEVICE); | |
839 | dma_dest = dma_map_single(fsl_chan->dev, dest + test_size * 3 / 4, | |
840 | test_size / 4, DMA_FROM_DEVICE); | |
841 | tx3 = fsl_dma_prep_memcpy(chan, dma_dest, dma_src, test_size / 4, 0); | |
842 | async_tx_ack(tx3); | |
843 | ||
844 | /* Test exchanging the prepared tx sort */ | |
845 | cookie = fsl_dma_tx_submit(tx3); | |
846 | cookie = fsl_dma_tx_submit(tx2); | |
847 | ||
848 | #ifdef FSL_DMA_CALLBACKTEST | |
849 | if (dma_has_cap(DMA_INTERRUPT, ((struct fsl_dma_device *) | |
850 | dev_get_drvdata(fsl_chan->dev->parent))->common.cap_mask)) { | |
851 | tx3->callback = fsl_dma_callback_test; | |
852 | tx3->callback_param = fsl_chan; | |
853 | } | |
854 | #endif | |
855 | fsl_dma_memcpy_issue_pending(chan); | |
856 | msleep(2); | |
857 | ||
858 | if (fsl_dma_is_complete(chan, cookie, NULL, NULL) != DMA_SUCCESS) { | |
859 | dev_err(fsl_chan->dev, "selftest: Time out!\n"); | |
860 | err = -ENODEV; | |
861 | goto free_resources; | |
862 | } | |
863 | ||
864 | err = memcmp(src, dest, test_size); | |
865 | if (err) { | |
866 | for (i = 0; (*(src + i) == *(dest + i)) && (i < test_size); | |
867 | i++); | |
56822843 | 868 | dev_err(fsl_chan->dev, "selftest: Test failed, data %d/%ld is " |
173acc7c | 869 | "error! src 0x%x, dest 0x%x\n", |
56822843 | 870 | i, (long)test_size, *(src + i), *(dest + i)); |
173acc7c ZW |
871 | } |
872 | ||
873 | free_resources: | |
874 | fsl_dma_free_chan_resources(chan); | |
875 | out: | |
876 | kfree(src); | |
877 | return err; | |
878 | } | |
56822843 | 879 | #endif |
173acc7c ZW |
880 | |
881 | static int __devinit of_fsl_dma_chan_probe(struct of_device *dev, | |
882 | const struct of_device_id *match) | |
883 | { | |
884 | struct fsl_dma_device *fdev; | |
885 | struct fsl_dma_chan *new_fsl_chan; | |
886 | int err; | |
887 | ||
888 | fdev = dev_get_drvdata(dev->dev.parent); | |
889 | BUG_ON(!fdev); | |
890 | ||
891 | /* alloc channel */ | |
892 | new_fsl_chan = kzalloc(sizeof(struct fsl_dma_chan), GFP_KERNEL); | |
893 | if (!new_fsl_chan) { | |
894 | dev_err(&dev->dev, "No free memory for allocating " | |
895 | "dma channels!\n"); | |
896 | err = -ENOMEM; | |
897 | goto err; | |
898 | } | |
899 | ||
900 | /* get dma channel register base */ | |
901 | err = of_address_to_resource(dev->node, 0, &new_fsl_chan->reg); | |
902 | if (err) { | |
903 | dev_err(&dev->dev, "Can't get %s property 'reg'\n", | |
904 | dev->node->full_name); | |
905 | goto err; | |
906 | } | |
907 | ||
908 | new_fsl_chan->feature = *(u32 *)match->data; | |
909 | ||
910 | if (!fdev->feature) | |
911 | fdev->feature = new_fsl_chan->feature; | |
912 | ||
913 | /* If the DMA device's feature is different than its channels', | |
914 | * report the bug. | |
915 | */ | |
916 | WARN_ON(fdev->feature != new_fsl_chan->feature); | |
917 | ||
918 | new_fsl_chan->dev = &dev->dev; | |
919 | new_fsl_chan->reg_base = ioremap(new_fsl_chan->reg.start, | |
920 | new_fsl_chan->reg.end - new_fsl_chan->reg.start + 1); | |
921 | ||
922 | new_fsl_chan->id = ((new_fsl_chan->reg.start - 0x100) & 0xfff) >> 7; | |
923 | if (new_fsl_chan->id > FSL_DMA_MAX_CHANS_PER_DEVICE) { | |
924 | dev_err(&dev->dev, "There is no %d channel!\n", | |
925 | new_fsl_chan->id); | |
926 | err = -EINVAL; | |
927 | goto err; | |
928 | } | |
929 | fdev->chan[new_fsl_chan->id] = new_fsl_chan; | |
930 | tasklet_init(&new_fsl_chan->tasklet, dma_do_tasklet, | |
931 | (unsigned long)new_fsl_chan); | |
932 | ||
933 | /* Init the channel */ | |
934 | dma_init(new_fsl_chan); | |
935 | ||
936 | /* Clear cdar registers */ | |
937 | set_cdar(new_fsl_chan, 0); | |
938 | ||
939 | switch (new_fsl_chan->feature & FSL_DMA_IP_MASK) { | |
940 | case FSL_DMA_IP_85XX: | |
941 | new_fsl_chan->toggle_ext_start = fsl_chan_toggle_ext_start; | |
942 | new_fsl_chan->toggle_ext_pause = fsl_chan_toggle_ext_pause; | |
943 | case FSL_DMA_IP_83XX: | |
944 | new_fsl_chan->set_src_loop_size = fsl_chan_set_src_loop_size; | |
945 | new_fsl_chan->set_dest_loop_size = fsl_chan_set_dest_loop_size; | |
946 | } | |
947 | ||
948 | spin_lock_init(&new_fsl_chan->desc_lock); | |
949 | INIT_LIST_HEAD(&new_fsl_chan->ld_queue); | |
950 | ||
951 | new_fsl_chan->common.device = &fdev->common; | |
952 | ||
953 | /* Add the channel to DMA device channel list */ | |
954 | list_add_tail(&new_fsl_chan->common.device_node, | |
955 | &fdev->common.channels); | |
956 | fdev->common.chancnt++; | |
957 | ||
958 | new_fsl_chan->irq = irq_of_parse_and_map(dev->node, 0); | |
959 | if (new_fsl_chan->irq != NO_IRQ) { | |
960 | err = request_irq(new_fsl_chan->irq, | |
961 | &fsl_dma_chan_do_interrupt, IRQF_SHARED, | |
962 | "fsldma-channel", new_fsl_chan); | |
963 | if (err) { | |
964 | dev_err(&dev->dev, "DMA channel %s request_irq error " | |
965 | "with return %d\n", dev->node->full_name, err); | |
966 | goto err; | |
967 | } | |
968 | } | |
969 | ||
970 | #ifdef CONFIG_FSL_DMA_SELFTEST | |
971 | err = fsl_dma_self_test(new_fsl_chan); | |
972 | if (err) | |
973 | goto err; | |
974 | #endif | |
975 | ||
976 | dev_info(&dev->dev, "#%d (%s), irq %d\n", new_fsl_chan->id, | |
977 | match->compatible, new_fsl_chan->irq); | |
978 | ||
979 | return 0; | |
980 | err: | |
981 | dma_halt(new_fsl_chan); | |
982 | iounmap(new_fsl_chan->reg_base); | |
983 | free_irq(new_fsl_chan->irq, new_fsl_chan); | |
984 | list_del(&new_fsl_chan->common.device_node); | |
985 | kfree(new_fsl_chan); | |
986 | return err; | |
987 | } | |
988 | ||
989 | const u32 mpc8540_dma_ip_feature = FSL_DMA_IP_85XX | FSL_DMA_BIG_ENDIAN; | |
990 | const u32 mpc8349_dma_ip_feature = FSL_DMA_IP_83XX | FSL_DMA_LITTLE_ENDIAN; | |
991 | ||
992 | static struct of_device_id of_fsl_dma_chan_ids[] = { | |
993 | { | |
994 | .compatible = "fsl,mpc8540-dma-channel", | |
995 | .data = (void *)&mpc8540_dma_ip_feature, | |
996 | }, | |
997 | { | |
998 | .compatible = "fsl,mpc8349-dma-channel", | |
999 | .data = (void *)&mpc8349_dma_ip_feature, | |
1000 | }, | |
1001 | {} | |
1002 | }; | |
1003 | ||
1004 | static struct of_platform_driver of_fsl_dma_chan_driver = { | |
1005 | .name = "of-fsl-dma-channel", | |
1006 | .match_table = of_fsl_dma_chan_ids, | |
1007 | .probe = of_fsl_dma_chan_probe, | |
1008 | }; | |
1009 | ||
1010 | static __init int of_fsl_dma_chan_init(void) | |
1011 | { | |
1012 | return of_register_platform_driver(&of_fsl_dma_chan_driver); | |
1013 | } | |
1014 | ||
1015 | static int __devinit of_fsl_dma_probe(struct of_device *dev, | |
1016 | const struct of_device_id *match) | |
1017 | { | |
1018 | int err; | |
1019 | unsigned int irq; | |
1020 | struct fsl_dma_device *fdev; | |
1021 | ||
1022 | fdev = kzalloc(sizeof(struct fsl_dma_device), GFP_KERNEL); | |
1023 | if (!fdev) { | |
1024 | dev_err(&dev->dev, "No enough memory for 'priv'\n"); | |
1025 | err = -ENOMEM; | |
1026 | goto err; | |
1027 | } | |
1028 | fdev->dev = &dev->dev; | |
1029 | INIT_LIST_HEAD(&fdev->common.channels); | |
1030 | ||
1031 | /* get DMA controller register base */ | |
1032 | err = of_address_to_resource(dev->node, 0, &fdev->reg); | |
1033 | if (err) { | |
1034 | dev_err(&dev->dev, "Can't get %s property 'reg'\n", | |
1035 | dev->node->full_name); | |
1036 | goto err; | |
1037 | } | |
1038 | ||
1039 | dev_info(&dev->dev, "Probe the Freescale DMA driver for %s " | |
56822843 ZW |
1040 | "controller at %p...\n", |
1041 | match->compatible, (void *)fdev->reg.start); | |
173acc7c ZW |
1042 | fdev->reg_base = ioremap(fdev->reg.start, fdev->reg.end |
1043 | - fdev->reg.start + 1); | |
1044 | ||
1045 | dma_cap_set(DMA_MEMCPY, fdev->common.cap_mask); | |
1046 | dma_cap_set(DMA_INTERRUPT, fdev->common.cap_mask); | |
1047 | fdev->common.device_alloc_chan_resources = fsl_dma_alloc_chan_resources; | |
1048 | fdev->common.device_free_chan_resources = fsl_dma_free_chan_resources; | |
2187c269 | 1049 | fdev->common.device_prep_dma_interrupt = fsl_dma_prep_interrupt; |
173acc7c ZW |
1050 | fdev->common.device_prep_dma_memcpy = fsl_dma_prep_memcpy; |
1051 | fdev->common.device_is_tx_complete = fsl_dma_is_complete; | |
1052 | fdev->common.device_issue_pending = fsl_dma_memcpy_issue_pending; | |
1053 | fdev->common.device_dependency_added = fsl_dma_dependency_added; | |
1054 | fdev->common.dev = &dev->dev; | |
1055 | ||
1056 | irq = irq_of_parse_and_map(dev->node, 0); | |
1057 | if (irq != NO_IRQ) { | |
1058 | err = request_irq(irq, &fsl_dma_do_interrupt, IRQF_SHARED, | |
1059 | "fsldma-device", fdev); | |
1060 | if (err) { | |
1061 | dev_err(&dev->dev, "DMA device request_irq error " | |
1062 | "with return %d\n", err); | |
1063 | goto err; | |
1064 | } | |
1065 | } | |
1066 | ||
1067 | dev_set_drvdata(&(dev->dev), fdev); | |
1068 | of_platform_bus_probe(dev->node, of_fsl_dma_chan_ids, &dev->dev); | |
1069 | ||
1070 | dma_async_device_register(&fdev->common); | |
1071 | return 0; | |
1072 | ||
1073 | err: | |
1074 | iounmap(fdev->reg_base); | |
1075 | kfree(fdev); | |
1076 | return err; | |
1077 | } | |
1078 | ||
1079 | static struct of_device_id of_fsl_dma_ids[] = { | |
1080 | { .compatible = "fsl,mpc8540-dma", }, | |
1081 | { .compatible = "fsl,mpc8349-dma", }, | |
1082 | {} | |
1083 | }; | |
1084 | ||
1085 | static struct of_platform_driver of_fsl_dma_driver = { | |
1086 | .name = "of-fsl-dma", | |
1087 | .match_table = of_fsl_dma_ids, | |
1088 | .probe = of_fsl_dma_probe, | |
1089 | }; | |
1090 | ||
1091 | static __init int of_fsl_dma_init(void) | |
1092 | { | |
1093 | return of_register_platform_driver(&of_fsl_dma_driver); | |
1094 | } | |
1095 | ||
1096 | subsys_initcall(of_fsl_dma_chan_init); | |
1097 | subsys_initcall(of_fsl_dma_init); |