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a21765a7 BD |
1 | /* linux/arch/arm/plat-s3c24xx/dma.c |
2 | * | |
e02f8664 | 3 | * Copyright 2003-2006 Simtec Electronics |
a21765a7 BD |
4 | * Ben Dooks <ben@simtec.co.uk> |
5 | * | |
6 | * S3C2410 DMA core | |
7 | * | |
8 | * http://armlinux.simtec.co.uk/ | |
9 | * | |
10 | * This program is free software; you can redistribute it and/or modify | |
11 | * it under the terms of the GNU General Public License version 2 as | |
12 | * published by the Free Software Foundation. | |
13 | */ | |
14 | ||
15 | ||
16 | #ifdef CONFIG_S3C2410_DMA_DEBUG | |
17 | #define DEBUG | |
18 | #endif | |
19 | ||
20 | #include <linux/module.h> | |
21 | #include <linux/init.h> | |
22 | #include <linux/sched.h> | |
23 | #include <linux/spinlock.h> | |
24 | #include <linux/interrupt.h> | |
25 | #include <linux/sysdev.h> | |
26 | #include <linux/slab.h> | |
27 | #include <linux/errno.h> | |
fced80c7 | 28 | #include <linux/io.h> |
a21765a7 BD |
29 | |
30 | #include <asm/system.h> | |
31 | #include <asm/irq.h> | |
a09e64fb | 32 | #include <mach/hardware.h> |
dcea83ad | 33 | #include <mach/dma.h> |
a09e64fb | 34 | #include <mach/map.h> |
a21765a7 | 35 | |
992426bf | 36 | #include <plat/dma-s3c24xx.h> |
44dc9404 | 37 | #include <plat/regs-dma.h> |
a21765a7 BD |
38 | |
39 | /* io map for dma */ | |
40 | static void __iomem *dma_base; | |
41 | static struct kmem_cache *dma_kmem; | |
42 | ||
48adbcf3 BD |
43 | static int dma_channels; |
44 | ||
a7717435 | 45 | static struct s3c24xx_dma_selection dma_sel; |
a21765a7 | 46 | |
a21765a7 BD |
47 | |
48 | /* debugging functions */ | |
49 | ||
50 | #define BUF_MAGIC (0xcafebabe) | |
51 | ||
52 | #define dmawarn(fmt...) printk(KERN_DEBUG fmt) | |
53 | ||
54 | #define dma_regaddr(chan, reg) ((chan)->regs + (reg)) | |
55 | ||
56 | #if 1 | |
57 | #define dma_wrreg(chan, reg, val) writel((val), (chan)->regs + (reg)) | |
58 | #else | |
59 | static inline void | |
60 | dma_wrreg(struct s3c2410_dma_chan *chan, int reg, unsigned long val) | |
61 | { | |
62 | pr_debug("writing %08x to register %08x\n",(unsigned int)val,reg); | |
63 | writel(val, dma_regaddr(chan, reg)); | |
64 | } | |
65 | #endif | |
66 | ||
67 | #define dma_rdreg(chan, reg) readl((chan)->regs + (reg)) | |
68 | ||
69 | /* captured register state for debug */ | |
70 | ||
71 | struct s3c2410_dma_regstate { | |
72 | unsigned long dcsrc; | |
73 | unsigned long disrc; | |
74 | unsigned long dstat; | |
75 | unsigned long dcon; | |
76 | unsigned long dmsktrig; | |
77 | }; | |
78 | ||
79 | #ifdef CONFIG_S3C2410_DMA_DEBUG | |
80 | ||
81 | /* dmadbg_showregs | |
82 | * | |
83 | * simple debug routine to print the current state of the dma registers | |
84 | */ | |
85 | ||
86 | static void | |
87 | dmadbg_capture(struct s3c2410_dma_chan *chan, struct s3c2410_dma_regstate *regs) | |
88 | { | |
89 | regs->dcsrc = dma_rdreg(chan, S3C2410_DMA_DCSRC); | |
90 | regs->disrc = dma_rdreg(chan, S3C2410_DMA_DISRC); | |
91 | regs->dstat = dma_rdreg(chan, S3C2410_DMA_DSTAT); | |
92 | regs->dcon = dma_rdreg(chan, S3C2410_DMA_DCON); | |
93 | regs->dmsktrig = dma_rdreg(chan, S3C2410_DMA_DMASKTRIG); | |
94 | } | |
95 | ||
96 | static void | |
97 | dmadbg_dumpregs(const char *fname, int line, struct s3c2410_dma_chan *chan, | |
98 | struct s3c2410_dma_regstate *regs) | |
99 | { | |
100 | printk(KERN_DEBUG "dma%d: %s:%d: DCSRC=%08lx, DISRC=%08lx, DSTAT=%08lx DMT=%02lx, DCON=%08lx\n", | |
101 | chan->number, fname, line, | |
102 | regs->dcsrc, regs->disrc, regs->dstat, regs->dmsktrig, | |
103 | regs->dcon); | |
104 | } | |
105 | ||
106 | static void | |
107 | dmadbg_showchan(const char *fname, int line, struct s3c2410_dma_chan *chan) | |
108 | { | |
109 | struct s3c2410_dma_regstate state; | |
110 | ||
111 | dmadbg_capture(chan, &state); | |
112 | ||
113 | printk(KERN_DEBUG "dma%d: %s:%d: ls=%d, cur=%p, %p %p\n", | |
114 | chan->number, fname, line, chan->load_state, | |
115 | chan->curr, chan->next, chan->end); | |
116 | ||
117 | dmadbg_dumpregs(fname, line, chan, &state); | |
118 | } | |
119 | ||
120 | static void | |
121 | dmadbg_showregs(const char *fname, int line, struct s3c2410_dma_chan *chan) | |
122 | { | |
123 | struct s3c2410_dma_regstate state; | |
124 | ||
125 | dmadbg_capture(chan, &state); | |
126 | dmadbg_dumpregs(fname, line, chan, &state); | |
127 | } | |
128 | ||
8e86f427 HH |
129 | #define dbg_showregs(chan) dmadbg_showregs(__func__, __LINE__, (chan)) |
130 | #define dbg_showchan(chan) dmadbg_showchan(__func__, __LINE__, (chan)) | |
a21765a7 BD |
131 | #else |
132 | #define dbg_showregs(chan) do { } while(0) | |
133 | #define dbg_showchan(chan) do { } while(0) | |
134 | #endif /* CONFIG_S3C2410_DMA_DEBUG */ | |
135 | ||
a21765a7 BD |
136 | /* s3c2410_dma_stats_timeout |
137 | * | |
138 | * Update DMA stats from timeout info | |
139 | */ | |
140 | ||
141 | static void | |
142 | s3c2410_dma_stats_timeout(struct s3c2410_dma_stats *stats, int val) | |
143 | { | |
144 | if (stats == NULL) | |
145 | return; | |
146 | ||
147 | if (val > stats->timeout_longest) | |
148 | stats->timeout_longest = val; | |
149 | if (val < stats->timeout_shortest) | |
150 | stats->timeout_shortest = val; | |
151 | ||
152 | stats->timeout_avg += val; | |
153 | } | |
154 | ||
155 | /* s3c2410_dma_waitforload | |
156 | * | |
157 | * wait for the DMA engine to load a buffer, and update the state accordingly | |
158 | */ | |
159 | ||
160 | static int | |
161 | s3c2410_dma_waitforload(struct s3c2410_dma_chan *chan, int line) | |
162 | { | |
163 | int timeout = chan->load_timeout; | |
164 | int took; | |
165 | ||
166 | if (chan->load_state != S3C2410_DMALOAD_1LOADED) { | |
167 | printk(KERN_ERR "dma%d: s3c2410_dma_waitforload() called in loadstate %d from line %d\n", chan->number, chan->load_state, line); | |
168 | return 0; | |
169 | } | |
170 | ||
171 | if (chan->stats != NULL) | |
172 | chan->stats->loads++; | |
173 | ||
174 | while (--timeout > 0) { | |
175 | if ((dma_rdreg(chan, S3C2410_DMA_DSTAT) << (32-20)) != 0) { | |
176 | took = chan->load_timeout - timeout; | |
177 | ||
178 | s3c2410_dma_stats_timeout(chan->stats, took); | |
179 | ||
180 | switch (chan->load_state) { | |
181 | case S3C2410_DMALOAD_1LOADED: | |
182 | chan->load_state = S3C2410_DMALOAD_1RUNNING; | |
183 | break; | |
184 | ||
185 | default: | |
186 | printk(KERN_ERR "dma%d: unknown load_state in s3c2410_dma_waitforload() %d\n", chan->number, chan->load_state); | |
187 | } | |
188 | ||
189 | return 1; | |
190 | } | |
191 | } | |
192 | ||
193 | if (chan->stats != NULL) { | |
194 | chan->stats->timeout_failed++; | |
195 | } | |
196 | ||
197 | return 0; | |
198 | } | |
199 | ||
a21765a7 BD |
200 | /* s3c2410_dma_loadbuffer |
201 | * | |
202 | * load a buffer, and update the channel state | |
203 | */ | |
204 | ||
205 | static inline int | |
206 | s3c2410_dma_loadbuffer(struct s3c2410_dma_chan *chan, | |
207 | struct s3c2410_dma_buf *buf) | |
208 | { | |
209 | unsigned long reload; | |
210 | ||
a21765a7 BD |
211 | if (buf == NULL) { |
212 | dmawarn("buffer is NULL\n"); | |
213 | return -EINVAL; | |
214 | } | |
215 | ||
60e5c1b5 JL |
216 | pr_debug("s3c2410_chan_loadbuffer: loading buff %p (0x%08lx,0x%06x)\n", |
217 | buf, (unsigned long)buf->data, buf->size); | |
218 | ||
a21765a7 BD |
219 | /* check the state of the channel before we do anything */ |
220 | ||
221 | if (chan->load_state == S3C2410_DMALOAD_1LOADED) { | |
222 | dmawarn("load_state is S3C2410_DMALOAD_1LOADED\n"); | |
223 | } | |
224 | ||
225 | if (chan->load_state == S3C2410_DMALOAD_1LOADED_1RUNNING) { | |
226 | dmawarn("state is S3C2410_DMALOAD_1LOADED_1RUNNING\n"); | |
227 | } | |
228 | ||
229 | /* it would seem sensible if we are the last buffer to not bother | |
230 | * with the auto-reload bit, so that the DMA engine will not try | |
231 | * and load another transfer after this one has finished... | |
232 | */ | |
233 | if (chan->load_state == S3C2410_DMALOAD_NONE) { | |
234 | pr_debug("load_state is none, checking for noreload (next=%p)\n", | |
235 | buf->next); | |
236 | reload = (buf->next == NULL) ? S3C2410_DCON_NORELOAD : 0; | |
237 | } else { | |
238 | //pr_debug("load_state is %d => autoreload\n", chan->load_state); | |
239 | reload = S3C2410_DCON_AUTORELOAD; | |
240 | } | |
241 | ||
242 | if ((buf->data & 0xf0000000) != 0x30000000) { | |
243 | dmawarn("dmaload: buffer is %p\n", (void *)buf->data); | |
244 | } | |
245 | ||
246 | writel(buf->data, chan->addr_reg); | |
247 | ||
248 | dma_wrreg(chan, S3C2410_DMA_DCON, | |
249 | chan->dcon | reload | (buf->size/chan->xfer_unit)); | |
250 | ||
251 | chan->next = buf->next; | |
252 | ||
253 | /* update the state of the channel */ | |
254 | ||
255 | switch (chan->load_state) { | |
256 | case S3C2410_DMALOAD_NONE: | |
257 | chan->load_state = S3C2410_DMALOAD_1LOADED; | |
258 | break; | |
259 | ||
260 | case S3C2410_DMALOAD_1RUNNING: | |
261 | chan->load_state = S3C2410_DMALOAD_1LOADED_1RUNNING; | |
262 | break; | |
263 | ||
264 | default: | |
265 | dmawarn("dmaload: unknown state %d in loadbuffer\n", | |
266 | chan->load_state); | |
267 | break; | |
268 | } | |
269 | ||
270 | return 0; | |
271 | } | |
272 | ||
273 | /* s3c2410_dma_call_op | |
274 | * | |
275 | * small routine to call the op routine with the given op if it has been | |
276 | * registered | |
277 | */ | |
278 | ||
279 | static void | |
280 | s3c2410_dma_call_op(struct s3c2410_dma_chan *chan, enum s3c2410_chan_op op) | |
281 | { | |
282 | if (chan->op_fn != NULL) { | |
283 | (chan->op_fn)(chan, op); | |
284 | } | |
285 | } | |
286 | ||
287 | /* s3c2410_dma_buffdone | |
288 | * | |
289 | * small wrapper to check if callback routine needs to be called, and | |
290 | * if so, call it | |
291 | */ | |
292 | ||
293 | static inline void | |
294 | s3c2410_dma_buffdone(struct s3c2410_dma_chan *chan, struct s3c2410_dma_buf *buf, | |
295 | enum s3c2410_dma_buffresult result) | |
296 | { | |
297 | #if 0 | |
298 | pr_debug("callback_fn=%p, buf=%p, id=%p, size=%d, result=%d\n", | |
299 | chan->callback_fn, buf, buf->id, buf->size, result); | |
300 | #endif | |
301 | ||
302 | if (chan->callback_fn != NULL) { | |
303 | (chan->callback_fn)(chan, buf->id, buf->size, result); | |
304 | } | |
305 | } | |
306 | ||
307 | /* s3c2410_dma_start | |
308 | * | |
309 | * start a dma channel going | |
310 | */ | |
311 | ||
312 | static int s3c2410_dma_start(struct s3c2410_dma_chan *chan) | |
313 | { | |
314 | unsigned long tmp; | |
315 | unsigned long flags; | |
316 | ||
317 | pr_debug("s3c2410_start_dma: channel=%d\n", chan->number); | |
318 | ||
319 | local_irq_save(flags); | |
320 | ||
321 | if (chan->state == S3C2410_DMA_RUNNING) { | |
322 | pr_debug("s3c2410_start_dma: already running (%d)\n", chan->state); | |
323 | local_irq_restore(flags); | |
324 | return 0; | |
325 | } | |
326 | ||
327 | chan->state = S3C2410_DMA_RUNNING; | |
328 | ||
329 | /* check wether there is anything to load, and if not, see | |
330 | * if we can find anything to load | |
331 | */ | |
332 | ||
333 | if (chan->load_state == S3C2410_DMALOAD_NONE) { | |
334 | if (chan->next == NULL) { | |
335 | printk(KERN_ERR "dma%d: channel has nothing loaded\n", | |
336 | chan->number); | |
337 | chan->state = S3C2410_DMA_IDLE; | |
338 | local_irq_restore(flags); | |
339 | return -EINVAL; | |
340 | } | |
341 | ||
342 | s3c2410_dma_loadbuffer(chan, chan->next); | |
343 | } | |
344 | ||
345 | dbg_showchan(chan); | |
346 | ||
347 | /* enable the channel */ | |
348 | ||
349 | if (!chan->irq_enabled) { | |
350 | enable_irq(chan->irq); | |
351 | chan->irq_enabled = 1; | |
352 | } | |
353 | ||
354 | /* start the channel going */ | |
355 | ||
356 | tmp = dma_rdreg(chan, S3C2410_DMA_DMASKTRIG); | |
357 | tmp &= ~S3C2410_DMASKTRIG_STOP; | |
358 | tmp |= S3C2410_DMASKTRIG_ON; | |
359 | dma_wrreg(chan, S3C2410_DMA_DMASKTRIG, tmp); | |
360 | ||
361 | pr_debug("dma%d: %08lx to DMASKTRIG\n", chan->number, tmp); | |
362 | ||
363 | #if 0 | |
364 | /* the dma buffer loads should take care of clearing the AUTO | |
365 | * reloading feature */ | |
366 | tmp = dma_rdreg(chan, S3C2410_DMA_DCON); | |
367 | tmp &= ~S3C2410_DCON_NORELOAD; | |
368 | dma_wrreg(chan, S3C2410_DMA_DCON, tmp); | |
369 | #endif | |
370 | ||
371 | s3c2410_dma_call_op(chan, S3C2410_DMAOP_START); | |
372 | ||
373 | dbg_showchan(chan); | |
374 | ||
375 | /* if we've only loaded one buffer onto the channel, then chec | |
376 | * to see if we have another, and if so, try and load it so when | |
377 | * the first buffer is finished, the new one will be loaded onto | |
378 | * the channel */ | |
379 | ||
380 | if (chan->next != NULL) { | |
381 | if (chan->load_state == S3C2410_DMALOAD_1LOADED) { | |
382 | ||
383 | if (s3c2410_dma_waitforload(chan, __LINE__) == 0) { | |
384 | pr_debug("%s: buff not yet loaded, no more todo\n", | |
8e86f427 | 385 | __func__); |
a21765a7 BD |
386 | } else { |
387 | chan->load_state = S3C2410_DMALOAD_1RUNNING; | |
388 | s3c2410_dma_loadbuffer(chan, chan->next); | |
389 | } | |
390 | ||
391 | } else if (chan->load_state == S3C2410_DMALOAD_1RUNNING) { | |
392 | s3c2410_dma_loadbuffer(chan, chan->next); | |
393 | } | |
394 | } | |
395 | ||
396 | ||
397 | local_irq_restore(flags); | |
398 | ||
399 | return 0; | |
400 | } | |
401 | ||
402 | /* s3c2410_dma_canload | |
403 | * | |
404 | * work out if we can queue another buffer into the DMA engine | |
405 | */ | |
406 | ||
407 | static int | |
408 | s3c2410_dma_canload(struct s3c2410_dma_chan *chan) | |
409 | { | |
410 | if (chan->load_state == S3C2410_DMALOAD_NONE || | |
411 | chan->load_state == S3C2410_DMALOAD_1RUNNING) | |
412 | return 1; | |
413 | ||
414 | return 0; | |
415 | } | |
416 | ||
417 | /* s3c2410_dma_enqueue | |
418 | * | |
419 | * queue an given buffer for dma transfer. | |
420 | * | |
421 | * id the device driver's id information for this buffer | |
422 | * data the physical address of the buffer data | |
423 | * size the size of the buffer in bytes | |
424 | * | |
425 | * If the channel is not running, then the flag S3C2410_DMAF_AUTOSTART | |
426 | * is checked, and if set, the channel is started. If this flag isn't set, | |
427 | * then an error will be returned. | |
428 | * | |
429 | * It is possible to queue more than one DMA buffer onto a channel at | |
430 | * once, and the code will deal with the re-loading of the next buffer | |
431 | * when necessary. | |
432 | */ | |
433 | ||
434 | int s3c2410_dma_enqueue(unsigned int channel, void *id, | |
435 | dma_addr_t data, int size) | |
436 | { | |
97c1b145 | 437 | struct s3c2410_dma_chan *chan = s3c_dma_lookup_channel(channel); |
a21765a7 BD |
438 | struct s3c2410_dma_buf *buf; |
439 | unsigned long flags; | |
440 | ||
441 | if (chan == NULL) | |
442 | return -EINVAL; | |
443 | ||
444 | pr_debug("%s: id=%p, data=%08x, size=%d\n", | |
8e86f427 | 445 | __func__, id, (unsigned int)data, size); |
a21765a7 BD |
446 | |
447 | buf = kmem_cache_alloc(dma_kmem, GFP_ATOMIC); | |
448 | if (buf == NULL) { | |
449 | pr_debug("%s: out of memory (%ld alloc)\n", | |
8e86f427 | 450 | __func__, (long)sizeof(*buf)); |
a21765a7 BD |
451 | return -ENOMEM; |
452 | } | |
453 | ||
8e86f427 | 454 | //pr_debug("%s: new buffer %p\n", __func__, buf); |
a21765a7 BD |
455 | //dbg_showchan(chan); |
456 | ||
457 | buf->next = NULL; | |
458 | buf->data = buf->ptr = data; | |
459 | buf->size = size; | |
460 | buf->id = id; | |
461 | buf->magic = BUF_MAGIC; | |
462 | ||
463 | local_irq_save(flags); | |
464 | ||
465 | if (chan->curr == NULL) { | |
466 | /* we've got nothing loaded... */ | |
467 | pr_debug("%s: buffer %p queued onto empty channel\n", | |
8e86f427 | 468 | __func__, buf); |
a21765a7 BD |
469 | |
470 | chan->curr = buf; | |
471 | chan->end = buf; | |
472 | chan->next = NULL; | |
473 | } else { | |
474 | pr_debug("dma%d: %s: buffer %p queued onto non-empty channel\n", | |
8e86f427 | 475 | chan->number, __func__, buf); |
a21765a7 BD |
476 | |
477 | if (chan->end == NULL) | |
478 | pr_debug("dma%d: %s: %p not empty, and chan->end==NULL?\n", | |
8e86f427 | 479 | chan->number, __func__, chan); |
a21765a7 BD |
480 | |
481 | chan->end->next = buf; | |
482 | chan->end = buf; | |
483 | } | |
484 | ||
485 | /* if necessary, update the next buffer field */ | |
486 | if (chan->next == NULL) | |
487 | chan->next = buf; | |
488 | ||
489 | /* check to see if we can load a buffer */ | |
490 | if (chan->state == S3C2410_DMA_RUNNING) { | |
491 | if (chan->load_state == S3C2410_DMALOAD_1LOADED && 1) { | |
492 | if (s3c2410_dma_waitforload(chan, __LINE__) == 0) { | |
493 | printk(KERN_ERR "dma%d: loadbuffer:" | |
494 | "timeout loading buffer\n", | |
495 | chan->number); | |
496 | dbg_showchan(chan); | |
497 | local_irq_restore(flags); | |
498 | return -EINVAL; | |
499 | } | |
500 | } | |
501 | ||
502 | while (s3c2410_dma_canload(chan) && chan->next != NULL) { | |
503 | s3c2410_dma_loadbuffer(chan, chan->next); | |
504 | } | |
505 | } else if (chan->state == S3C2410_DMA_IDLE) { | |
506 | if (chan->flags & S3C2410_DMAF_AUTOSTART) { | |
046c9d32 BD |
507 | s3c2410_dma_ctrl(chan->number | DMACH_LOW_LEVEL, |
508 | S3C2410_DMAOP_START); | |
a21765a7 BD |
509 | } |
510 | } | |
511 | ||
512 | local_irq_restore(flags); | |
513 | return 0; | |
514 | } | |
515 | ||
516 | EXPORT_SYMBOL(s3c2410_dma_enqueue); | |
517 | ||
518 | static inline void | |
519 | s3c2410_dma_freebuf(struct s3c2410_dma_buf *buf) | |
520 | { | |
521 | int magicok = (buf->magic == BUF_MAGIC); | |
522 | ||
523 | buf->magic = -1; | |
524 | ||
525 | if (magicok) { | |
526 | kmem_cache_free(dma_kmem, buf); | |
527 | } else { | |
528 | printk("s3c2410_dma_freebuf: buff %p with bad magic\n", buf); | |
529 | } | |
530 | } | |
531 | ||
532 | /* s3c2410_dma_lastxfer | |
533 | * | |
534 | * called when the system is out of buffers, to ensure that the channel | |
535 | * is prepared for shutdown. | |
536 | */ | |
537 | ||
538 | static inline void | |
539 | s3c2410_dma_lastxfer(struct s3c2410_dma_chan *chan) | |
540 | { | |
541 | #if 0 | |
542 | pr_debug("dma%d: s3c2410_dma_lastxfer: load_state %d\n", | |
543 | chan->number, chan->load_state); | |
544 | #endif | |
545 | ||
546 | switch (chan->load_state) { | |
547 | case S3C2410_DMALOAD_NONE: | |
548 | break; | |
549 | ||
550 | case S3C2410_DMALOAD_1LOADED: | |
551 | if (s3c2410_dma_waitforload(chan, __LINE__) == 0) { | |
552 | /* flag error? */ | |
553 | printk(KERN_ERR "dma%d: timeout waiting for load (%s)\n", | |
8e86f427 | 554 | chan->number, __func__); |
a21765a7 BD |
555 | return; |
556 | } | |
557 | break; | |
558 | ||
559 | case S3C2410_DMALOAD_1LOADED_1RUNNING: | |
560 | /* I belive in this case we do not have anything to do | |
561 | * until the next buffer comes along, and we turn off the | |
562 | * reload */ | |
563 | return; | |
564 | ||
565 | default: | |
566 | pr_debug("dma%d: lastxfer: unhandled load_state %d with no next\n", | |
567 | chan->number, chan->load_state); | |
568 | return; | |
569 | ||
570 | } | |
571 | ||
572 | /* hopefully this'll shut the damned thing up after the transfer... */ | |
573 | dma_wrreg(chan, S3C2410_DMA_DCON, chan->dcon | S3C2410_DCON_NORELOAD); | |
574 | } | |
575 | ||
576 | ||
577 | #define dmadbg2(x...) | |
578 | ||
579 | static irqreturn_t | |
580 | s3c2410_dma_irq(int irq, void *devpw) | |
581 | { | |
582 | struct s3c2410_dma_chan *chan = (struct s3c2410_dma_chan *)devpw; | |
583 | struct s3c2410_dma_buf *buf; | |
584 | ||
585 | buf = chan->curr; | |
586 | ||
587 | dbg_showchan(chan); | |
588 | ||
589 | /* modify the channel state */ | |
590 | ||
591 | switch (chan->load_state) { | |
592 | case S3C2410_DMALOAD_1RUNNING: | |
593 | /* TODO - if we are running only one buffer, we probably | |
594 | * want to reload here, and then worry about the buffer | |
595 | * callback */ | |
596 | ||
597 | chan->load_state = S3C2410_DMALOAD_NONE; | |
598 | break; | |
599 | ||
600 | case S3C2410_DMALOAD_1LOADED: | |
601 | /* iirc, we should go back to NONE loaded here, we | |
602 | * had a buffer, and it was never verified as being | |
603 | * loaded. | |
604 | */ | |
605 | ||
606 | chan->load_state = S3C2410_DMALOAD_NONE; | |
607 | break; | |
608 | ||
609 | case S3C2410_DMALOAD_1LOADED_1RUNNING: | |
610 | /* we'll worry about checking to see if another buffer is | |
611 | * ready after we've called back the owner. This should | |
612 | * ensure we do not wait around too long for the DMA | |
613 | * engine to start the next transfer | |
614 | */ | |
615 | ||
616 | chan->load_state = S3C2410_DMALOAD_1LOADED; | |
617 | break; | |
618 | ||
619 | case S3C2410_DMALOAD_NONE: | |
620 | printk(KERN_ERR "dma%d: IRQ with no loaded buffer?\n", | |
621 | chan->number); | |
622 | break; | |
623 | ||
624 | default: | |
625 | printk(KERN_ERR "dma%d: IRQ in invalid load_state %d\n", | |
626 | chan->number, chan->load_state); | |
627 | break; | |
628 | } | |
629 | ||
630 | if (buf != NULL) { | |
631 | /* update the chain to make sure that if we load any more | |
632 | * buffers when we call the callback function, things should | |
633 | * work properly */ | |
634 | ||
635 | chan->curr = buf->next; | |
636 | buf->next = NULL; | |
637 | ||
638 | if (buf->magic != BUF_MAGIC) { | |
639 | printk(KERN_ERR "dma%d: %s: buf %p incorrect magic\n", | |
8e86f427 | 640 | chan->number, __func__, buf); |
a21765a7 BD |
641 | return IRQ_HANDLED; |
642 | } | |
643 | ||
644 | s3c2410_dma_buffdone(chan, buf, S3C2410_RES_OK); | |
645 | ||
646 | /* free resouces */ | |
647 | s3c2410_dma_freebuf(buf); | |
648 | } else { | |
649 | } | |
650 | ||
651 | /* only reload if the channel is still running... our buffer done | |
652 | * routine may have altered the state by requesting the dma channel | |
653 | * to stop or shutdown... */ | |
654 | ||
655 | /* todo: check that when the channel is shut-down from inside this | |
656 | * function, we cope with unsetting reload, etc */ | |
657 | ||
658 | if (chan->next != NULL && chan->state != S3C2410_DMA_IDLE) { | |
659 | unsigned long flags; | |
660 | ||
661 | switch (chan->load_state) { | |
662 | case S3C2410_DMALOAD_1RUNNING: | |
663 | /* don't need to do anything for this state */ | |
664 | break; | |
665 | ||
666 | case S3C2410_DMALOAD_NONE: | |
667 | /* can load buffer immediately */ | |
668 | break; | |
669 | ||
670 | case S3C2410_DMALOAD_1LOADED: | |
671 | if (s3c2410_dma_waitforload(chan, __LINE__) == 0) { | |
672 | /* flag error? */ | |
673 | printk(KERN_ERR "dma%d: timeout waiting for load (%s)\n", | |
8e86f427 | 674 | chan->number, __func__); |
a21765a7 BD |
675 | return IRQ_HANDLED; |
676 | } | |
677 | ||
678 | break; | |
679 | ||
680 | case S3C2410_DMALOAD_1LOADED_1RUNNING: | |
681 | goto no_load; | |
682 | ||
683 | default: | |
684 | printk(KERN_ERR "dma%d: unknown load_state in irq, %d\n", | |
685 | chan->number, chan->load_state); | |
686 | return IRQ_HANDLED; | |
687 | } | |
688 | ||
689 | local_irq_save(flags); | |
690 | s3c2410_dma_loadbuffer(chan, chan->next); | |
691 | local_irq_restore(flags); | |
692 | } else { | |
693 | s3c2410_dma_lastxfer(chan); | |
694 | ||
695 | /* see if we can stop this channel.. */ | |
696 | if (chan->load_state == S3C2410_DMALOAD_NONE) { | |
697 | pr_debug("dma%d: end of transfer, stopping channel (%ld)\n", | |
698 | chan->number, jiffies); | |
699 | s3c2410_dma_ctrl(chan->number | DMACH_LOW_LEVEL, | |
700 | S3C2410_DMAOP_STOP); | |
701 | } | |
702 | } | |
703 | ||
704 | no_load: | |
705 | return IRQ_HANDLED; | |
706 | } | |
707 | ||
708 | static struct s3c2410_dma_chan *s3c2410_dma_map_channel(int channel); | |
709 | ||
710 | /* s3c2410_request_dma | |
711 | * | |
712 | * get control of an dma channel | |
713 | */ | |
714 | ||
715 | int s3c2410_dma_request(unsigned int channel, | |
716 | struct s3c2410_dma_client *client, | |
717 | void *dev) | |
718 | { | |
719 | struct s3c2410_dma_chan *chan; | |
720 | unsigned long flags; | |
721 | int err; | |
722 | ||
723 | pr_debug("dma%d: s3c2410_request_dma: client=%s, dev=%p\n", | |
724 | channel, client->name, dev); | |
725 | ||
726 | local_irq_save(flags); | |
727 | ||
728 | chan = s3c2410_dma_map_channel(channel); | |
729 | if (chan == NULL) { | |
730 | local_irq_restore(flags); | |
731 | return -EBUSY; | |
732 | } | |
733 | ||
734 | dbg_showchan(chan); | |
735 | ||
736 | chan->client = client; | |
737 | chan->in_use = 1; | |
738 | ||
739 | if (!chan->irq_claimed) { | |
740 | pr_debug("dma%d: %s : requesting irq %d\n", | |
8e86f427 | 741 | channel, __func__, chan->irq); |
a21765a7 BD |
742 | |
743 | chan->irq_claimed = 1; | |
744 | local_irq_restore(flags); | |
745 | ||
746 | err = request_irq(chan->irq, s3c2410_dma_irq, IRQF_DISABLED, | |
747 | client->name, (void *)chan); | |
748 | ||
749 | local_irq_save(flags); | |
750 | ||
751 | if (err) { | |
752 | chan->in_use = 0; | |
753 | chan->irq_claimed = 0; | |
754 | local_irq_restore(flags); | |
755 | ||
756 | printk(KERN_ERR "%s: cannot get IRQ %d for DMA %d\n", | |
757 | client->name, chan->irq, chan->number); | |
758 | return err; | |
759 | } | |
760 | ||
761 | chan->irq_enabled = 1; | |
762 | } | |
763 | ||
764 | local_irq_restore(flags); | |
765 | ||
766 | /* need to setup */ | |
767 | ||
8e86f427 | 768 | pr_debug("%s: channel initialised, %p\n", __func__, chan); |
a21765a7 | 769 | |
a07c438f | 770 | return chan->number | DMACH_LOW_LEVEL; |
a21765a7 BD |
771 | } |
772 | ||
773 | EXPORT_SYMBOL(s3c2410_dma_request); | |
774 | ||
775 | /* s3c2410_dma_free | |
776 | * | |
777 | * release the given channel back to the system, will stop and flush | |
778 | * any outstanding transfers, and ensure the channel is ready for the | |
779 | * next claimant. | |
780 | * | |
781 | * Note, although a warning is currently printed if the freeing client | |
782 | * info is not the same as the registrant's client info, the free is still | |
783 | * allowed to go through. | |
784 | */ | |
785 | ||
dcea83ad | 786 | int s3c2410_dma_free(unsigned int channel, struct s3c2410_dma_client *client) |
a21765a7 | 787 | { |
97c1b145 | 788 | struct s3c2410_dma_chan *chan = s3c_dma_lookup_channel(channel); |
a21765a7 BD |
789 | unsigned long flags; |
790 | ||
791 | if (chan == NULL) | |
792 | return -EINVAL; | |
793 | ||
794 | local_irq_save(flags); | |
795 | ||
796 | if (chan->client != client) { | |
797 | printk(KERN_WARNING "dma%d: possible free from different client (channel %p, passed %p)\n", | |
798 | channel, chan->client, client); | |
799 | } | |
800 | ||
801 | /* sort out stopping and freeing the channel */ | |
802 | ||
803 | if (chan->state != S3C2410_DMA_IDLE) { | |
804 | pr_debug("%s: need to stop dma channel %p\n", | |
8e86f427 | 805 | __func__, chan); |
a21765a7 BD |
806 | |
807 | /* possibly flush the channel */ | |
808 | s3c2410_dma_ctrl(channel, S3C2410_DMAOP_STOP); | |
809 | } | |
810 | ||
811 | chan->client = NULL; | |
812 | chan->in_use = 0; | |
813 | ||
814 | if (chan->irq_claimed) | |
815 | free_irq(chan->irq, (void *)chan); | |
816 | ||
817 | chan->irq_claimed = 0; | |
818 | ||
819 | if (!(channel & DMACH_LOW_LEVEL)) | |
97c1b145 | 820 | s3c_dma_chan_map[channel] = NULL; |
a21765a7 BD |
821 | |
822 | local_irq_restore(flags); | |
823 | ||
824 | return 0; | |
825 | } | |
826 | ||
827 | EXPORT_SYMBOL(s3c2410_dma_free); | |
828 | ||
829 | static int s3c2410_dma_dostop(struct s3c2410_dma_chan *chan) | |
830 | { | |
831 | unsigned long flags; | |
832 | unsigned long tmp; | |
833 | ||
8e86f427 | 834 | pr_debug("%s:\n", __func__); |
a21765a7 BD |
835 | |
836 | dbg_showchan(chan); | |
837 | ||
838 | local_irq_save(flags); | |
839 | ||
840 | s3c2410_dma_call_op(chan, S3C2410_DMAOP_STOP); | |
841 | ||
842 | tmp = dma_rdreg(chan, S3C2410_DMA_DMASKTRIG); | |
843 | tmp |= S3C2410_DMASKTRIG_STOP; | |
844 | //tmp &= ~S3C2410_DMASKTRIG_ON; | |
845 | dma_wrreg(chan, S3C2410_DMA_DMASKTRIG, tmp); | |
846 | ||
847 | #if 0 | |
848 | /* should also clear interrupts, according to WinCE BSP */ | |
849 | tmp = dma_rdreg(chan, S3C2410_DMA_DCON); | |
850 | tmp |= S3C2410_DCON_NORELOAD; | |
851 | dma_wrreg(chan, S3C2410_DMA_DCON, tmp); | |
852 | #endif | |
853 | ||
854 | /* should stop do this, or should we wait for flush? */ | |
855 | chan->state = S3C2410_DMA_IDLE; | |
856 | chan->load_state = S3C2410_DMALOAD_NONE; | |
857 | ||
858 | local_irq_restore(flags); | |
859 | ||
860 | return 0; | |
861 | } | |
862 | ||
a7717435 | 863 | static void s3c2410_dma_waitforstop(struct s3c2410_dma_chan *chan) |
a21765a7 BD |
864 | { |
865 | unsigned long tmp; | |
866 | unsigned int timeout = 0x10000; | |
867 | ||
868 | while (timeout-- > 0) { | |
869 | tmp = dma_rdreg(chan, S3C2410_DMA_DMASKTRIG); | |
870 | ||
871 | if (!(tmp & S3C2410_DMASKTRIG_ON)) | |
872 | return; | |
873 | } | |
874 | ||
875 | pr_debug("dma%d: failed to stop?\n", chan->number); | |
876 | } | |
877 | ||
878 | ||
879 | /* s3c2410_dma_flush | |
880 | * | |
881 | * stop the channel, and remove all current and pending transfers | |
882 | */ | |
883 | ||
884 | static int s3c2410_dma_flush(struct s3c2410_dma_chan *chan) | |
885 | { | |
886 | struct s3c2410_dma_buf *buf, *next; | |
887 | unsigned long flags; | |
888 | ||
8e86f427 | 889 | pr_debug("%s: chan %p (%d)\n", __func__, chan, chan->number); |
a21765a7 BD |
890 | |
891 | dbg_showchan(chan); | |
892 | ||
893 | local_irq_save(flags); | |
894 | ||
895 | if (chan->state != S3C2410_DMA_IDLE) { | |
8e86f427 | 896 | pr_debug("%s: stopping channel...\n", __func__ ); |
a21765a7 BD |
897 | s3c2410_dma_ctrl(chan->number, S3C2410_DMAOP_STOP); |
898 | } | |
899 | ||
900 | buf = chan->curr; | |
901 | if (buf == NULL) | |
902 | buf = chan->next; | |
903 | ||
904 | chan->curr = chan->next = chan->end = NULL; | |
905 | ||
906 | if (buf != NULL) { | |
907 | for ( ; buf != NULL; buf = next) { | |
908 | next = buf->next; | |
909 | ||
910 | pr_debug("%s: free buffer %p, next %p\n", | |
8e86f427 | 911 | __func__, buf, buf->next); |
a21765a7 BD |
912 | |
913 | s3c2410_dma_buffdone(chan, buf, S3C2410_RES_ABORT); | |
914 | s3c2410_dma_freebuf(buf); | |
915 | } | |
916 | } | |
917 | ||
918 | dbg_showregs(chan); | |
919 | ||
920 | s3c2410_dma_waitforstop(chan); | |
921 | ||
922 | #if 0 | |
923 | /* should also clear interrupts, according to WinCE BSP */ | |
924 | { | |
925 | unsigned long tmp; | |
926 | ||
927 | tmp = dma_rdreg(chan, S3C2410_DMA_DCON); | |
928 | tmp |= S3C2410_DCON_NORELOAD; | |
929 | dma_wrreg(chan, S3C2410_DMA_DCON, tmp); | |
930 | } | |
931 | #endif | |
932 | ||
933 | dbg_showregs(chan); | |
934 | ||
935 | local_irq_restore(flags); | |
936 | ||
937 | return 0; | |
938 | } | |
939 | ||
a7717435 | 940 | static int s3c2410_dma_started(struct s3c2410_dma_chan *chan) |
a21765a7 BD |
941 | { |
942 | unsigned long flags; | |
943 | ||
944 | local_irq_save(flags); | |
945 | ||
946 | dbg_showchan(chan); | |
947 | ||
948 | /* if we've only loaded one buffer onto the channel, then chec | |
949 | * to see if we have another, and if so, try and load it so when | |
950 | * the first buffer is finished, the new one will be loaded onto | |
951 | * the channel */ | |
952 | ||
953 | if (chan->next != NULL) { | |
954 | if (chan->load_state == S3C2410_DMALOAD_1LOADED) { | |
955 | ||
956 | if (s3c2410_dma_waitforload(chan, __LINE__) == 0) { | |
957 | pr_debug("%s: buff not yet loaded, no more todo\n", | |
8e86f427 | 958 | __func__); |
a21765a7 BD |
959 | } else { |
960 | chan->load_state = S3C2410_DMALOAD_1RUNNING; | |
961 | s3c2410_dma_loadbuffer(chan, chan->next); | |
962 | } | |
963 | ||
964 | } else if (chan->load_state == S3C2410_DMALOAD_1RUNNING) { | |
965 | s3c2410_dma_loadbuffer(chan, chan->next); | |
966 | } | |
967 | } | |
968 | ||
969 | ||
970 | local_irq_restore(flags); | |
971 | ||
972 | return 0; | |
973 | ||
974 | } | |
975 | ||
976 | int | |
dcea83ad | 977 | s3c2410_dma_ctrl(unsigned int channel, enum s3c2410_chan_op op) |
a21765a7 | 978 | { |
97c1b145 | 979 | struct s3c2410_dma_chan *chan = s3c_dma_lookup_channel(channel); |
a21765a7 BD |
980 | |
981 | if (chan == NULL) | |
982 | return -EINVAL; | |
983 | ||
984 | switch (op) { | |
985 | case S3C2410_DMAOP_START: | |
986 | return s3c2410_dma_start(chan); | |
987 | ||
988 | case S3C2410_DMAOP_STOP: | |
989 | return s3c2410_dma_dostop(chan); | |
990 | ||
991 | case S3C2410_DMAOP_PAUSE: | |
992 | case S3C2410_DMAOP_RESUME: | |
993 | return -ENOENT; | |
994 | ||
995 | case S3C2410_DMAOP_FLUSH: | |
996 | return s3c2410_dma_flush(chan); | |
997 | ||
998 | case S3C2410_DMAOP_STARTED: | |
999 | return s3c2410_dma_started(chan); | |
1000 | ||
1001 | case S3C2410_DMAOP_TIMEOUT: | |
1002 | return 0; | |
1003 | ||
1004 | } | |
1005 | ||
1006 | return -ENOENT; /* unknown, don't bother */ | |
1007 | } | |
1008 | ||
1009 | EXPORT_SYMBOL(s3c2410_dma_ctrl); | |
1010 | ||
1011 | /* DMA configuration for each channel | |
1012 | * | |
1013 | * DISRCC -> source of the DMA (AHB,APB) | |
1014 | * DISRC -> source address of the DMA | |
1015 | * DIDSTC -> destination of the DMA (AHB,APD) | |
1016 | * DIDST -> destination address of the DMA | |
1017 | */ | |
1018 | ||
1019 | /* s3c2410_dma_config | |
1020 | * | |
1021 | * xfersize: size of unit in bytes (1,2,4) | |
a21765a7 BD |
1022 | */ |
1023 | ||
dcea83ad | 1024 | int s3c2410_dma_config(unsigned int channel, |
8970ef47 | 1025 | int xferunit) |
a21765a7 | 1026 | { |
97c1b145 | 1027 | struct s3c2410_dma_chan *chan = s3c_dma_lookup_channel(channel); |
8970ef47 | 1028 | unsigned int dcon; |
a21765a7 BD |
1029 | |
1030 | pr_debug("%s: chan=%d, xfer_unit=%d, dcon=%08x\n", | |
8e86f427 | 1031 | __func__, channel, xferunit, dcon); |
a21765a7 BD |
1032 | |
1033 | if (chan == NULL) | |
1034 | return -EINVAL; | |
1035 | ||
8e86f427 | 1036 | pr_debug("%s: Initial dcon is %08x\n", __func__, dcon); |
a21765a7 | 1037 | |
8970ef47 | 1038 | dcon = chan->dcon & dma_sel.dcon_mask; |
a21765a7 | 1039 | |
8e86f427 | 1040 | pr_debug("%s: New dcon is %08x\n", __func__, dcon); |
a21765a7 | 1041 | |
8970ef47 BD |
1042 | switch (chan->req_ch) { |
1043 | case DMACH_I2S_IN: | |
1044 | case DMACH_I2S_OUT: | |
1045 | case DMACH_PCM_IN: | |
1046 | case DMACH_PCM_OUT: | |
1047 | case DMACH_MIC_IN: | |
1048 | default: | |
1049 | dcon |= S3C2410_DCON_HANDSHAKE; | |
1050 | dcon |= S3C2410_DCON_SYNC_PCLK; | |
1051 | break; | |
1052 | ||
1053 | case DMACH_SDI: | |
1054 | /* note, ensure if need HANDSHAKE or not */ | |
1055 | dcon |= S3C2410_DCON_SYNC_PCLK; | |
1056 | break; | |
1057 | ||
1058 | case DMACH_XD0: | |
1059 | case DMACH_XD1: | |
1060 | dcon |= S3C2410_DCON_HANDSHAKE; | |
1061 | dcon |= S3C2410_DCON_SYNC_HCLK; | |
1062 | break; | |
1063 | } | |
1064 | ||
a21765a7 BD |
1065 | switch (xferunit) { |
1066 | case 1: | |
1067 | dcon |= S3C2410_DCON_BYTE; | |
1068 | break; | |
1069 | ||
1070 | case 2: | |
1071 | dcon |= S3C2410_DCON_HALFWORD; | |
1072 | break; | |
1073 | ||
1074 | case 4: | |
1075 | dcon |= S3C2410_DCON_WORD; | |
1076 | break; | |
1077 | ||
1078 | default: | |
8e86f427 | 1079 | pr_debug("%s: bad transfer size %d\n", __func__, xferunit); |
a21765a7 BD |
1080 | return -EINVAL; |
1081 | } | |
1082 | ||
1083 | dcon |= S3C2410_DCON_HWTRIG; | |
1084 | dcon |= S3C2410_DCON_INTREQ; | |
1085 | ||
8e86f427 | 1086 | pr_debug("%s: dcon now %08x\n", __func__, dcon); |
a21765a7 BD |
1087 | |
1088 | chan->dcon = dcon; | |
1089 | chan->xfer_unit = xferunit; | |
1090 | ||
1091 | return 0; | |
1092 | } | |
1093 | ||
1094 | EXPORT_SYMBOL(s3c2410_dma_config); | |
1095 | ||
a21765a7 BD |
1096 | |
1097 | /* s3c2410_dma_devconfig | |
1098 | * | |
1099 | * configure the dma source/destination hardware type and address | |
1100 | * | |
1101 | * source: S3C2410_DMASRC_HW: source is hardware | |
1102 | * S3C2410_DMASRC_MEM: source is memory | |
1103 | * | |
a21765a7 BD |
1104 | * devaddr: physical address of the source |
1105 | */ | |
1106 | ||
14894b9b | 1107 | int s3c2410_dma_devconfig(unsigned int channel, |
a21765a7 | 1108 | enum s3c2410_dmasrc source, |
a21765a7 BD |
1109 | unsigned long devaddr) |
1110 | { | |
97c1b145 | 1111 | struct s3c2410_dma_chan *chan = s3c_dma_lookup_channel(channel); |
8970ef47 | 1112 | unsigned int hwcfg; |
a21765a7 BD |
1113 | |
1114 | if (chan == NULL) | |
1115 | return -EINVAL; | |
1116 | ||
8970ef47 BD |
1117 | pr_debug("%s: source=%d, devaddr=%08lx\n", |
1118 | __func__, (int)source, devaddr); | |
a21765a7 BD |
1119 | |
1120 | chan->source = source; | |
1121 | chan->dev_addr = devaddr; | |
8970ef47 BD |
1122 | |
1123 | switch (chan->req_ch) { | |
1124 | case DMACH_XD0: | |
1125 | case DMACH_XD1: | |
1126 | hwcfg = 0; /* AHB */ | |
1127 | break; | |
1128 | ||
1129 | default: | |
1130 | hwcfg = S3C2410_DISRCC_APB; | |
1131 | } | |
1132 | ||
1133 | /* always assume our peripheral desintation is a fixed | |
1134 | * address in memory. */ | |
1135 | hwcfg |= S3C2410_DISRCC_INC; | |
a21765a7 BD |
1136 | |
1137 | switch (source) { | |
1138 | case S3C2410_DMASRC_HW: | |
1139 | /* source is hardware */ | |
1140 | pr_debug("%s: hw source, devaddr=%08lx, hwcfg=%d\n", | |
8e86f427 | 1141 | __func__, devaddr, hwcfg); |
a21765a7 BD |
1142 | dma_wrreg(chan, S3C2410_DMA_DISRCC, hwcfg & 3); |
1143 | dma_wrreg(chan, S3C2410_DMA_DISRC, devaddr); | |
1144 | dma_wrreg(chan, S3C2410_DMA_DIDSTC, (0<<1) | (0<<0)); | |
1145 | ||
1146 | chan->addr_reg = dma_regaddr(chan, S3C2410_DMA_DIDST); | |
c6709e8e | 1147 | break; |
a21765a7 BD |
1148 | |
1149 | case S3C2410_DMASRC_MEM: | |
1150 | /* source is memory */ | |
8e86f427 HH |
1151 | pr_debug("%s: mem source, devaddr=%08lx, hwcfg=%d\n", |
1152 | __func__, devaddr, hwcfg); | |
a21765a7 BD |
1153 | dma_wrreg(chan, S3C2410_DMA_DISRCC, (0<<1) | (0<<0)); |
1154 | dma_wrreg(chan, S3C2410_DMA_DIDST, devaddr); | |
1155 | dma_wrreg(chan, S3C2410_DMA_DIDSTC, hwcfg & 3); | |
1156 | ||
1157 | chan->addr_reg = dma_regaddr(chan, S3C2410_DMA_DISRC); | |
c6709e8e BD |
1158 | break; |
1159 | ||
1160 | default: | |
1161 | printk(KERN_ERR "dma%d: invalid source type (%d)\n", | |
1162 | channel, source); | |
1163 | ||
1164 | return -EINVAL; | |
a21765a7 BD |
1165 | } |
1166 | ||
c6709e8e BD |
1167 | if (dma_sel.direction != NULL) |
1168 | (dma_sel.direction)(chan, chan->map, source); | |
1169 | ||
1170 | return 0; | |
a21765a7 BD |
1171 | } |
1172 | ||
1173 | EXPORT_SYMBOL(s3c2410_dma_devconfig); | |
1174 | ||
1175 | /* s3c2410_dma_getposition | |
1176 | * | |
1177 | * returns the current transfer points for the dma source and destination | |
1178 | */ | |
1179 | ||
dcea83ad | 1180 | int s3c2410_dma_getposition(unsigned int channel, dma_addr_t *src, dma_addr_t *dst) |
a21765a7 | 1181 | { |
97c1b145 | 1182 | struct s3c2410_dma_chan *chan = s3c_dma_lookup_channel(channel); |
a21765a7 BD |
1183 | |
1184 | if (chan == NULL) | |
1185 | return -EINVAL; | |
1186 | ||
1187 | if (src != NULL) | |
1188 | *src = dma_rdreg(chan, S3C2410_DMA_DCSRC); | |
1189 | ||
1190 | if (dst != NULL) | |
1191 | *dst = dma_rdreg(chan, S3C2410_DMA_DCDST); | |
1192 | ||
1193 | return 0; | |
1194 | } | |
1195 | ||
1196 | EXPORT_SYMBOL(s3c2410_dma_getposition); | |
1197 | ||
871fcd7c | 1198 | static inline struct s3c2410_dma_chan *to_dma_chan(struct sys_device *dev) |
c58f7a1d BD |
1199 | { |
1200 | return container_of(dev, struct s3c2410_dma_chan, dev); | |
1201 | } | |
a21765a7 BD |
1202 | |
1203 | /* system device class */ | |
1204 | ||
1205 | #ifdef CONFIG_PM | |
1206 | ||
1207 | static int s3c2410_dma_suspend(struct sys_device *dev, pm_message_t state) | |
1208 | { | |
c58f7a1d | 1209 | struct s3c2410_dma_chan *cp = to_dma_chan(dev); |
a21765a7 BD |
1210 | |
1211 | printk(KERN_DEBUG "suspending dma channel %d\n", cp->number); | |
1212 | ||
1213 | if (dma_rdreg(cp, S3C2410_DMA_DMASKTRIG) & S3C2410_DMASKTRIG_ON) { | |
1214 | /* the dma channel is still working, which is probably | |
1215 | * a bad thing to do over suspend/resume. We stop the | |
1216 | * channel and assume that the client is either going to | |
1217 | * retry after resume, or that it is broken. | |
1218 | */ | |
1219 | ||
1220 | printk(KERN_INFO "dma: stopping channel %d due to suspend\n", | |
1221 | cp->number); | |
1222 | ||
1223 | s3c2410_dma_dostop(cp); | |
1224 | } | |
1225 | ||
1226 | return 0; | |
1227 | } | |
1228 | ||
1229 | static int s3c2410_dma_resume(struct sys_device *dev) | |
1230 | { | |
c58f7a1d BD |
1231 | struct s3c2410_dma_chan *cp = to_dma_chan(dev); |
1232 | unsigned int no = cp->number | DMACH_LOW_LEVEL; | |
1233 | ||
1234 | /* restore channel's hardware configuration */ | |
1235 | ||
1236 | if (!cp->in_use) | |
1237 | return 0; | |
1238 | ||
1239 | printk(KERN_INFO "dma%d: restoring configuration\n", cp->number); | |
1240 | ||
8970ef47 BD |
1241 | s3c2410_dma_config(no, cp->xfer_unit); |
1242 | s3c2410_dma_devconfig(no, cp->source, cp->dev_addr); | |
c58f7a1d BD |
1243 | |
1244 | /* re-select the dma source for this channel */ | |
1245 | ||
1246 | if (cp->map != NULL) | |
1247 | dma_sel.select(cp, cp->map); | |
1248 | ||
a21765a7 BD |
1249 | return 0; |
1250 | } | |
1251 | ||
1252 | #else | |
1253 | #define s3c2410_dma_suspend NULL | |
1254 | #define s3c2410_dma_resume NULL | |
1255 | #endif /* CONFIG_PM */ | |
1256 | ||
1257 | struct sysdev_class dma_sysclass = { | |
af5ca3f4 | 1258 | .name = "s3c24xx-dma", |
a21765a7 BD |
1259 | .suspend = s3c2410_dma_suspend, |
1260 | .resume = s3c2410_dma_resume, | |
1261 | }; | |
1262 | ||
1263 | /* kmem cache implementation */ | |
1264 | ||
51cc5068 | 1265 | static void s3c2410_dma_cache_ctor(void *p) |
a21765a7 BD |
1266 | { |
1267 | memset(p, 0, sizeof(struct s3c2410_dma_buf)); | |
1268 | } | |
1269 | ||
1270 | /* initialisation code */ | |
1271 | ||
a7717435 | 1272 | static int __init s3c24xx_dma_sysclass_init(void) |
48adbcf3 BD |
1273 | { |
1274 | int ret = sysdev_class_register(&dma_sysclass); | |
1275 | ||
1276 | if (ret != 0) | |
1277 | printk(KERN_ERR "dma sysclass registration failed\n"); | |
1278 | ||
1279 | return ret; | |
1280 | } | |
1281 | ||
1282 | core_initcall(s3c24xx_dma_sysclass_init); | |
1283 | ||
a7717435 | 1284 | static int __init s3c24xx_dma_sysdev_register(void) |
48adbcf3 BD |
1285 | { |
1286 | struct s3c2410_dma_chan *cp = s3c2410_chans; | |
1287 | int channel, ret; | |
1288 | ||
1289 | for (channel = 0; channel < dma_channels; cp++, channel++) { | |
1290 | cp->dev.cls = &dma_sysclass; | |
1291 | cp->dev.id = channel; | |
1292 | ret = sysdev_register(&cp->dev); | |
1293 | ||
1294 | if (ret) { | |
1295 | printk(KERN_ERR "error registering dev for dma %d\n", | |
1296 | channel); | |
1297 | return ret; | |
1298 | } | |
1299 | } | |
1300 | ||
1301 | return 0; | |
1302 | } | |
1303 | ||
1304 | late_initcall(s3c24xx_dma_sysdev_register); | |
1305 | ||
1306 | int __init s3c24xx_dma_init(unsigned int channels, unsigned int irq, | |
1307 | unsigned int stride) | |
a21765a7 BD |
1308 | { |
1309 | struct s3c2410_dma_chan *cp; | |
1310 | int channel; | |
1311 | int ret; | |
1312 | ||
e02f8664 | 1313 | printk("S3C24XX DMA Driver, Copyright 2003-2006 Simtec Electronics\n"); |
a21765a7 | 1314 | |
48adbcf3 BD |
1315 | dma_channels = channels; |
1316 | ||
1317 | dma_base = ioremap(S3C24XX_PA_DMA, stride * channels); | |
a21765a7 BD |
1318 | if (dma_base == NULL) { |
1319 | printk(KERN_ERR "dma failed to remap register block\n"); | |
1320 | return -ENOMEM; | |
1321 | } | |
1322 | ||
48adbcf3 BD |
1323 | dma_kmem = kmem_cache_create("dma_desc", |
1324 | sizeof(struct s3c2410_dma_buf), 0, | |
a21765a7 | 1325 | SLAB_HWCACHE_ALIGN, |
20c2df83 | 1326 | s3c2410_dma_cache_ctor); |
a21765a7 BD |
1327 | |
1328 | if (dma_kmem == NULL) { | |
1329 | printk(KERN_ERR "dma failed to make kmem cache\n"); | |
1330 | ret = -ENOMEM; | |
1331 | goto err; | |
1332 | } | |
1333 | ||
48adbcf3 | 1334 | for (channel = 0; channel < channels; channel++) { |
a21765a7 BD |
1335 | cp = &s3c2410_chans[channel]; |
1336 | ||
1337 | memset(cp, 0, sizeof(struct s3c2410_dma_chan)); | |
1338 | ||
1339 | /* dma channel irqs are in order.. */ | |
1340 | cp->number = channel; | |
48adbcf3 BD |
1341 | cp->irq = channel + irq; |
1342 | cp->regs = dma_base + (channel * stride); | |
a21765a7 BD |
1343 | |
1344 | /* point current stats somewhere */ | |
1345 | cp->stats = &cp->stats_store; | |
1346 | cp->stats_store.timeout_shortest = LONG_MAX; | |
1347 | ||
1348 | /* basic channel configuration */ | |
1349 | ||
1350 | cp->load_timeout = 1<<18; | |
1351 | ||
a21765a7 BD |
1352 | printk("DMA channel %d at %p, irq %d\n", |
1353 | cp->number, cp->regs, cp->irq); | |
1354 | } | |
1355 | ||
1356 | return 0; | |
1357 | ||
1358 | err: | |
1359 | kmem_cache_destroy(dma_kmem); | |
1360 | iounmap(dma_base); | |
1361 | dma_base = NULL; | |
1362 | return ret; | |
1363 | } | |
1364 | ||
f2c10d6c | 1365 | int __init s3c2410_dma_init(void) |
48adbcf3 BD |
1366 | { |
1367 | return s3c24xx_dma_init(4, IRQ_DMA0, 0x40); | |
1368 | } | |
a21765a7 BD |
1369 | |
1370 | static inline int is_channel_valid(unsigned int channel) | |
1371 | { | |
1372 | return (channel & DMA_CH_VALID); | |
1373 | } | |
1374 | ||
0c6022d4 BD |
1375 | static struct s3c24xx_dma_order *dma_order; |
1376 | ||
1377 | ||
a21765a7 BD |
1378 | /* s3c2410_dma_map_channel() |
1379 | * | |
1380 | * turn the virtual channel number into a real, and un-used hardware | |
1381 | * channel. | |
1382 | * | |
0c6022d4 BD |
1383 | * first, try the dma ordering given to us by either the relevant |
1384 | * dma code, or the board. Then just find the first usable free | |
1385 | * channel | |
a21765a7 BD |
1386 | */ |
1387 | ||
a7717435 | 1388 | static struct s3c2410_dma_chan *s3c2410_dma_map_channel(int channel) |
a21765a7 | 1389 | { |
0c6022d4 | 1390 | struct s3c24xx_dma_order_ch *ord = NULL; |
a21765a7 BD |
1391 | struct s3c24xx_dma_map *ch_map; |
1392 | struct s3c2410_dma_chan *dmach; | |
1393 | int ch; | |
1394 | ||
1395 | if (dma_sel.map == NULL || channel > dma_sel.map_size) | |
1396 | return NULL; | |
1397 | ||
1398 | ch_map = dma_sel.map + channel; | |
1399 | ||
0c6022d4 BD |
1400 | /* first, try the board mapping */ |
1401 | ||
1402 | if (dma_order) { | |
1403 | ord = &dma_order->channels[channel]; | |
1404 | ||
48adbcf3 | 1405 | for (ch = 0; ch < dma_channels; ch++) { |
947a2462 | 1406 | int tmp; |
0c6022d4 BD |
1407 | if (!is_channel_valid(ord->list[ch])) |
1408 | continue; | |
1409 | ||
947a2462 RL |
1410 | tmp = ord->list[ch] & ~DMA_CH_VALID; |
1411 | if (s3c2410_chans[tmp].in_use == 0) { | |
1412 | ch = tmp; | |
0c6022d4 BD |
1413 | goto found; |
1414 | } | |
1415 | } | |
1416 | ||
1417 | if (ord->flags & DMA_CH_NEVER) | |
1418 | return NULL; | |
1419 | } | |
1420 | ||
1421 | /* second, search the channel map for first free */ | |
1422 | ||
48adbcf3 | 1423 | for (ch = 0; ch < dma_channels; ch++) { |
a21765a7 BD |
1424 | if (!is_channel_valid(ch_map->channels[ch])) |
1425 | continue; | |
1426 | ||
1427 | if (s3c2410_chans[ch].in_use == 0) { | |
1428 | printk("mapped channel %d to %d\n", channel, ch); | |
1429 | break; | |
1430 | } | |
1431 | } | |
1432 | ||
48adbcf3 | 1433 | if (ch >= dma_channels) |
a21765a7 BD |
1434 | return NULL; |
1435 | ||
1436 | /* update our channel mapping */ | |
1437 | ||
0c6022d4 | 1438 | found: |
a21765a7 | 1439 | dmach = &s3c2410_chans[ch]; |
c58f7a1d | 1440 | dmach->map = ch_map; |
8970ef47 | 1441 | dmach->req_ch = channel; |
97c1b145 | 1442 | s3c_dma_chan_map[channel] = dmach; |
a21765a7 BD |
1443 | |
1444 | /* select the channel */ | |
1445 | ||
1446 | (dma_sel.select)(dmach, ch_map); | |
1447 | ||
1448 | return dmach; | |
1449 | } | |
1450 | ||
a21765a7 BD |
1451 | static int s3c24xx_dma_check_entry(struct s3c24xx_dma_map *map, int ch) |
1452 | { | |
a21765a7 BD |
1453 | return 0; |
1454 | } | |
1455 | ||
1456 | int __init s3c24xx_dma_init_map(struct s3c24xx_dma_selection *sel) | |
1457 | { | |
1458 | struct s3c24xx_dma_map *nmap; | |
1459 | size_t map_sz = sizeof(*nmap) * sel->map_size; | |
1460 | int ptr; | |
1461 | ||
1462 | nmap = kmalloc(map_sz, GFP_KERNEL); | |
1463 | if (nmap == NULL) | |
1464 | return -ENOMEM; | |
1465 | ||
1466 | memcpy(nmap, sel->map, map_sz); | |
1467 | memcpy(&dma_sel, sel, sizeof(*sel)); | |
1468 | ||
1469 | dma_sel.map = nmap; | |
1470 | ||
1471 | for (ptr = 0; ptr < sel->map_size; ptr++) | |
1472 | s3c24xx_dma_check_entry(nmap+ptr, ptr); | |
1473 | ||
1474 | return 0; | |
1475 | } | |
0c6022d4 BD |
1476 | |
1477 | int __init s3c24xx_dma_order_set(struct s3c24xx_dma_order *ord) | |
1478 | { | |
1479 | struct s3c24xx_dma_order *nord = dma_order; | |
1480 | ||
1481 | if (nord == NULL) | |
1482 | nord = kmalloc(sizeof(struct s3c24xx_dma_order), GFP_KERNEL); | |
1483 | ||
1484 | if (nord == NULL) { | |
1485 | printk(KERN_ERR "no memory to store dma channel order\n"); | |
1486 | return -ENOMEM; | |
1487 | } | |
1488 | ||
1489 | dma_order = nord; | |
1490 | memcpy(nord, ord, sizeof(struct s3c24xx_dma_order)); | |
1491 | return 0; | |
1492 | } |