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c8acd6aa ZG |
1 | /* |
2 | * Copyright 2012 Marvell International Ltd. | |
3 | * | |
4 | * This program is free software; you can redistribute it and/or modify | |
5 | * it under the terms of the GNU General Public License version 2 as | |
6 | * published by the Free Software Foundation. | |
7 | */ | |
7331205a | 8 | #include <linux/err.h> |
c8acd6aa ZG |
9 | #include <linux/module.h> |
10 | #include <linux/init.h> | |
11 | #include <linux/types.h> | |
12 | #include <linux/interrupt.h> | |
13 | #include <linux/dma-mapping.h> | |
14 | #include <linux/slab.h> | |
15 | #include <linux/dmaengine.h> | |
16 | #include <linux/platform_device.h> | |
17 | #include <linux/device.h> | |
18 | #include <linux/platform_data/mmp_dma.h> | |
19 | #include <linux/dmapool.h> | |
20 | #include <linux/of_device.h> | |
21 | #include <linux/of.h> | |
22 | ||
23 | #include "dmaengine.h" | |
24 | ||
25 | #define DCSR 0x0000 | |
26 | #define DALGN 0x00a0 | |
27 | #define DINT 0x00f0 | |
28 | #define DDADR 0x0200 | |
29 | #define DSADR 0x0204 | |
30 | #define DTADR 0x0208 | |
31 | #define DCMD 0x020c | |
32 | ||
33 | #define DCSR_RUN (1 << 31) /* Run Bit (read / write) */ | |
34 | #define DCSR_NODESC (1 << 30) /* No-Descriptor Fetch (read / write) */ | |
35 | #define DCSR_STOPIRQEN (1 << 29) /* Stop Interrupt Enable (read / write) */ | |
36 | #define DCSR_REQPEND (1 << 8) /* Request Pending (read-only) */ | |
37 | #define DCSR_STOPSTATE (1 << 3) /* Stop State (read-only) */ | |
38 | #define DCSR_ENDINTR (1 << 2) /* End Interrupt (read / write) */ | |
39 | #define DCSR_STARTINTR (1 << 1) /* Start Interrupt (read / write) */ | |
40 | #define DCSR_BUSERR (1 << 0) /* Bus Error Interrupt (read / write) */ | |
41 | ||
42 | #define DCSR_EORIRQEN (1 << 28) /* End of Receive Interrupt Enable (R/W) */ | |
43 | #define DCSR_EORJMPEN (1 << 27) /* Jump to next descriptor on EOR */ | |
44 | #define DCSR_EORSTOPEN (1 << 26) /* STOP on an EOR */ | |
45 | #define DCSR_SETCMPST (1 << 25) /* Set Descriptor Compare Status */ | |
46 | #define DCSR_CLRCMPST (1 << 24) /* Clear Descriptor Compare Status */ | |
47 | #define DCSR_CMPST (1 << 10) /* The Descriptor Compare Status */ | |
48 | #define DCSR_EORINTR (1 << 9) /* The end of Receive */ | |
49 | ||
50 | #define DRCMR_MAPVLD (1 << 7) /* Map Valid (read / write) */ | |
51 | #define DRCMR_CHLNUM 0x1f /* mask for Channel Number (read / write) */ | |
52 | ||
53 | #define DDADR_DESCADDR 0xfffffff0 /* Address of next descriptor (mask) */ | |
54 | #define DDADR_STOP (1 << 0) /* Stop (read / write) */ | |
55 | ||
56 | #define DCMD_INCSRCADDR (1 << 31) /* Source Address Increment Setting. */ | |
57 | #define DCMD_INCTRGADDR (1 << 30) /* Target Address Increment Setting. */ | |
58 | #define DCMD_FLOWSRC (1 << 29) /* Flow Control by the source. */ | |
59 | #define DCMD_FLOWTRG (1 << 28) /* Flow Control by the target. */ | |
60 | #define DCMD_STARTIRQEN (1 << 22) /* Start Interrupt Enable */ | |
61 | #define DCMD_ENDIRQEN (1 << 21) /* End Interrupt Enable */ | |
62 | #define DCMD_ENDIAN (1 << 18) /* Device Endian-ness. */ | |
63 | #define DCMD_BURST8 (1 << 16) /* 8 byte burst */ | |
64 | #define DCMD_BURST16 (2 << 16) /* 16 byte burst */ | |
65 | #define DCMD_BURST32 (3 << 16) /* 32 byte burst */ | |
66 | #define DCMD_WIDTH1 (1 << 14) /* 1 byte width */ | |
67 | #define DCMD_WIDTH2 (2 << 14) /* 2 byte width (HalfWord) */ | |
68 | #define DCMD_WIDTH4 (3 << 14) /* 4 byte width (Word) */ | |
69 | #define DCMD_LENGTH 0x01fff /* length mask (max = 8K - 1) */ | |
70 | ||
71 | #define PDMA_ALIGNMENT 3 | |
72 | #define PDMA_MAX_DESC_BYTES 0x1000 | |
73 | ||
74 | struct mmp_pdma_desc_hw { | |
75 | u32 ddadr; /* Points to the next descriptor + flags */ | |
76 | u32 dsadr; /* DSADR value for the current transfer */ | |
77 | u32 dtadr; /* DTADR value for the current transfer */ | |
78 | u32 dcmd; /* DCMD value for the current transfer */ | |
79 | } __aligned(32); | |
80 | ||
81 | struct mmp_pdma_desc_sw { | |
82 | struct mmp_pdma_desc_hw desc; | |
83 | struct list_head node; | |
84 | struct list_head tx_list; | |
85 | struct dma_async_tx_descriptor async_tx; | |
86 | }; | |
87 | ||
88 | struct mmp_pdma_phy; | |
89 | ||
90 | struct mmp_pdma_chan { | |
91 | struct device *dev; | |
92 | struct dma_chan chan; | |
93 | struct dma_async_tx_descriptor desc; | |
94 | struct mmp_pdma_phy *phy; | |
95 | enum dma_transfer_direction dir; | |
96 | ||
97 | /* channel's basic info */ | |
98 | struct tasklet_struct tasklet; | |
99 | u32 dcmd; | |
100 | u32 drcmr; | |
101 | u32 dev_addr; | |
102 | ||
103 | /* list for desc */ | |
104 | spinlock_t desc_lock; /* Descriptor list lock */ | |
105 | struct list_head chain_pending; /* Link descriptors queue for pending */ | |
106 | struct list_head chain_running; /* Link descriptors queue for running */ | |
107 | bool idle; /* channel statue machine */ | |
108 | ||
109 | struct dma_pool *desc_pool; /* Descriptors pool */ | |
110 | }; | |
111 | ||
112 | struct mmp_pdma_phy { | |
113 | int idx; | |
114 | void __iomem *base; | |
115 | struct mmp_pdma_chan *vchan; | |
116 | }; | |
117 | ||
118 | struct mmp_pdma_device { | |
119 | int dma_channels; | |
120 | void __iomem *base; | |
121 | struct device *dev; | |
122 | struct dma_device device; | |
123 | struct mmp_pdma_phy *phy; | |
027f28b7 | 124 | spinlock_t phy_lock; /* protect alloc/free phy channels */ |
c8acd6aa ZG |
125 | }; |
126 | ||
127 | #define tx_to_mmp_pdma_desc(tx) container_of(tx, struct mmp_pdma_desc_sw, async_tx) | |
128 | #define to_mmp_pdma_desc(lh) container_of(lh, struct mmp_pdma_desc_sw, node) | |
129 | #define to_mmp_pdma_chan(dchan) container_of(dchan, struct mmp_pdma_chan, chan) | |
130 | #define to_mmp_pdma_dev(dmadev) container_of(dmadev, struct mmp_pdma_device, device) | |
131 | ||
132 | static void set_desc(struct mmp_pdma_phy *phy, dma_addr_t addr) | |
133 | { | |
134 | u32 reg = (phy->idx << 4) + DDADR; | |
135 | ||
136 | writel(addr, phy->base + reg); | |
137 | } | |
138 | ||
139 | static void enable_chan(struct mmp_pdma_phy *phy) | |
140 | { | |
141 | u32 reg; | |
142 | ||
143 | if (!phy->vchan) | |
144 | return; | |
145 | ||
146 | reg = phy->vchan->drcmr; | |
147 | reg = (((reg) < 64) ? 0x0100 : 0x1100) + (((reg) & 0x3f) << 2); | |
148 | writel(DRCMR_MAPVLD | phy->idx, phy->base + reg); | |
149 | ||
150 | reg = (phy->idx << 2) + DCSR; | |
151 | writel(readl(phy->base + reg) | DCSR_RUN, | |
152 | phy->base + reg); | |
153 | } | |
154 | ||
155 | static void disable_chan(struct mmp_pdma_phy *phy) | |
156 | { | |
157 | u32 reg; | |
158 | ||
159 | if (phy) { | |
160 | reg = (phy->idx << 2) + DCSR; | |
161 | writel(readl(phy->base + reg) & ~DCSR_RUN, | |
162 | phy->base + reg); | |
163 | } | |
164 | } | |
165 | ||
166 | static int clear_chan_irq(struct mmp_pdma_phy *phy) | |
167 | { | |
168 | u32 dcsr; | |
169 | u32 dint = readl(phy->base + DINT); | |
170 | u32 reg = (phy->idx << 2) + DCSR; | |
171 | ||
172 | if (dint & BIT(phy->idx)) { | |
173 | /* clear irq */ | |
174 | dcsr = readl(phy->base + reg); | |
175 | writel(dcsr, phy->base + reg); | |
176 | if ((dcsr & DCSR_BUSERR) && (phy->vchan)) | |
177 | dev_warn(phy->vchan->dev, "DCSR_BUSERR\n"); | |
178 | return 0; | |
179 | } | |
180 | return -EAGAIN; | |
181 | } | |
182 | ||
183 | static irqreturn_t mmp_pdma_chan_handler(int irq, void *dev_id) | |
184 | { | |
185 | struct mmp_pdma_phy *phy = dev_id; | |
186 | ||
187 | if (clear_chan_irq(phy) == 0) { | |
188 | tasklet_schedule(&phy->vchan->tasklet); | |
189 | return IRQ_HANDLED; | |
190 | } else | |
191 | return IRQ_NONE; | |
192 | } | |
193 | ||
194 | static irqreturn_t mmp_pdma_int_handler(int irq, void *dev_id) | |
195 | { | |
196 | struct mmp_pdma_device *pdev = dev_id; | |
197 | struct mmp_pdma_phy *phy; | |
198 | u32 dint = readl(pdev->base + DINT); | |
199 | int i, ret; | |
200 | int irq_num = 0; | |
201 | ||
202 | while (dint) { | |
203 | i = __ffs(dint); | |
204 | dint &= (dint - 1); | |
205 | phy = &pdev->phy[i]; | |
206 | ret = mmp_pdma_chan_handler(irq, phy); | |
207 | if (ret == IRQ_HANDLED) | |
208 | irq_num++; | |
209 | } | |
210 | ||
211 | if (irq_num) | |
212 | return IRQ_HANDLED; | |
213 | else | |
214 | return IRQ_NONE; | |
215 | } | |
216 | ||
217 | /* lookup free phy channel as descending priority */ | |
218 | static struct mmp_pdma_phy *lookup_phy(struct mmp_pdma_chan *pchan) | |
219 | { | |
220 | int prio, i; | |
221 | struct mmp_pdma_device *pdev = to_mmp_pdma_dev(pchan->chan.device); | |
222 | struct mmp_pdma_phy *phy; | |
027f28b7 | 223 | unsigned long flags; |
c8acd6aa ZG |
224 | |
225 | /* | |
226 | * dma channel priorities | |
227 | * ch 0 - 3, 16 - 19 <--> (0) | |
228 | * ch 4 - 7, 20 - 23 <--> (1) | |
229 | * ch 8 - 11, 24 - 27 <--> (2) | |
230 | * ch 12 - 15, 28 - 31 <--> (3) | |
231 | */ | |
027f28b7 XW |
232 | |
233 | spin_lock_irqsave(&pdev->phy_lock, flags); | |
c8acd6aa ZG |
234 | for (prio = 0; prio <= (((pdev->dma_channels - 1) & 0xf) >> 2); prio++) { |
235 | for (i = 0; i < pdev->dma_channels; i++) { | |
236 | if (prio != ((i & 0xf) >> 2)) | |
237 | continue; | |
238 | phy = &pdev->phy[i]; | |
239 | if (!phy->vchan) { | |
240 | phy->vchan = pchan; | |
027f28b7 | 241 | spin_unlock_irqrestore(&pdev->phy_lock, flags); |
c8acd6aa ZG |
242 | return phy; |
243 | } | |
244 | } | |
245 | } | |
246 | ||
027f28b7 | 247 | spin_unlock_irqrestore(&pdev->phy_lock, flags); |
c8acd6aa ZG |
248 | return NULL; |
249 | } | |
250 | ||
027f28b7 XW |
251 | static void mmp_pdma_free_phy(struct mmp_pdma_chan *pchan) |
252 | { | |
253 | struct mmp_pdma_device *pdev = to_mmp_pdma_dev(pchan->chan.device); | |
254 | unsigned long flags; | |
26a2dfde | 255 | u32 reg; |
027f28b7 XW |
256 | |
257 | if (!pchan->phy) | |
258 | return; | |
259 | ||
26a2dfde XW |
260 | /* clear the channel mapping in DRCMR */ |
261 | reg = pchan->phy->vchan->drcmr; | |
262 | reg = ((reg < 64) ? 0x0100 : 0x1100) + ((reg & 0x3f) << 2); | |
263 | writel(0, pchan->phy->base + reg); | |
264 | ||
027f28b7 XW |
265 | spin_lock_irqsave(&pdev->phy_lock, flags); |
266 | pchan->phy->vchan = NULL; | |
267 | pchan->phy = NULL; | |
268 | spin_unlock_irqrestore(&pdev->phy_lock, flags); | |
269 | } | |
270 | ||
c8acd6aa ZG |
271 | /* desc->tx_list ==> pending list */ |
272 | static void append_pending_queue(struct mmp_pdma_chan *chan, | |
273 | struct mmp_pdma_desc_sw *desc) | |
274 | { | |
275 | struct mmp_pdma_desc_sw *tail = | |
276 | to_mmp_pdma_desc(chan->chain_pending.prev); | |
277 | ||
278 | if (list_empty(&chan->chain_pending)) | |
279 | goto out_splice; | |
280 | ||
281 | /* one irq per queue, even appended */ | |
282 | tail->desc.ddadr = desc->async_tx.phys; | |
283 | tail->desc.dcmd &= ~DCMD_ENDIRQEN; | |
284 | ||
285 | /* softly link to pending list */ | |
286 | out_splice: | |
287 | list_splice_tail_init(&desc->tx_list, &chan->chain_pending); | |
288 | } | |
289 | ||
290 | /** | |
291 | * start_pending_queue - transfer any pending transactions | |
292 | * pending list ==> running list | |
293 | */ | |
294 | static void start_pending_queue(struct mmp_pdma_chan *chan) | |
295 | { | |
296 | struct mmp_pdma_desc_sw *desc; | |
297 | ||
298 | /* still in running, irq will start the pending list */ | |
299 | if (!chan->idle) { | |
300 | dev_dbg(chan->dev, "DMA controller still busy\n"); | |
301 | return; | |
302 | } | |
303 | ||
304 | if (list_empty(&chan->chain_pending)) { | |
305 | /* chance to re-fetch phy channel with higher prio */ | |
027f28b7 | 306 | mmp_pdma_free_phy(chan); |
c8acd6aa ZG |
307 | dev_dbg(chan->dev, "no pending list\n"); |
308 | return; | |
309 | } | |
310 | ||
311 | if (!chan->phy) { | |
312 | chan->phy = lookup_phy(chan); | |
313 | if (!chan->phy) { | |
314 | dev_dbg(chan->dev, "no free dma channel\n"); | |
315 | return; | |
316 | } | |
317 | } | |
318 | ||
319 | /* | |
320 | * pending -> running | |
321 | * reintilize pending list | |
322 | */ | |
323 | desc = list_first_entry(&chan->chain_pending, | |
324 | struct mmp_pdma_desc_sw, node); | |
325 | list_splice_tail_init(&chan->chain_pending, &chan->chain_running); | |
326 | ||
327 | /* | |
328 | * Program the descriptor's address into the DMA controller, | |
329 | * then start the DMA transaction | |
330 | */ | |
331 | set_desc(chan->phy, desc->async_tx.phys); | |
332 | enable_chan(chan->phy); | |
333 | chan->idle = false; | |
334 | } | |
335 | ||
336 | ||
337 | /* desc->tx_list ==> pending list */ | |
338 | static dma_cookie_t mmp_pdma_tx_submit(struct dma_async_tx_descriptor *tx) | |
339 | { | |
340 | struct mmp_pdma_chan *chan = to_mmp_pdma_chan(tx->chan); | |
341 | struct mmp_pdma_desc_sw *desc = tx_to_mmp_pdma_desc(tx); | |
342 | struct mmp_pdma_desc_sw *child; | |
343 | unsigned long flags; | |
344 | dma_cookie_t cookie = -EBUSY; | |
345 | ||
346 | spin_lock_irqsave(&chan->desc_lock, flags); | |
347 | ||
348 | list_for_each_entry(child, &desc->tx_list, node) { | |
349 | cookie = dma_cookie_assign(&child->async_tx); | |
350 | } | |
351 | ||
352 | append_pending_queue(chan, desc); | |
353 | ||
354 | spin_unlock_irqrestore(&chan->desc_lock, flags); | |
355 | ||
356 | return cookie; | |
357 | } | |
358 | ||
359 | struct mmp_pdma_desc_sw *mmp_pdma_alloc_descriptor(struct mmp_pdma_chan *chan) | |
360 | { | |
361 | struct mmp_pdma_desc_sw *desc; | |
362 | dma_addr_t pdesc; | |
363 | ||
364 | desc = dma_pool_alloc(chan->desc_pool, GFP_ATOMIC, &pdesc); | |
365 | if (!desc) { | |
366 | dev_err(chan->dev, "out of memory for link descriptor\n"); | |
367 | return NULL; | |
368 | } | |
369 | ||
370 | memset(desc, 0, sizeof(*desc)); | |
371 | INIT_LIST_HEAD(&desc->tx_list); | |
372 | dma_async_tx_descriptor_init(&desc->async_tx, &chan->chan); | |
373 | /* each desc has submit */ | |
374 | desc->async_tx.tx_submit = mmp_pdma_tx_submit; | |
375 | desc->async_tx.phys = pdesc; | |
376 | ||
377 | return desc; | |
378 | } | |
379 | ||
380 | /** | |
381 | * mmp_pdma_alloc_chan_resources - Allocate resources for DMA channel. | |
382 | * | |
383 | * This function will create a dma pool for descriptor allocation. | |
384 | * Request irq only when channel is requested | |
385 | * Return - The number of allocated descriptors. | |
386 | */ | |
387 | ||
388 | static int mmp_pdma_alloc_chan_resources(struct dma_chan *dchan) | |
389 | { | |
390 | struct mmp_pdma_chan *chan = to_mmp_pdma_chan(dchan); | |
391 | ||
392 | if (chan->desc_pool) | |
393 | return 1; | |
394 | ||
395 | chan->desc_pool = | |
396 | dma_pool_create(dev_name(&dchan->dev->device), chan->dev, | |
397 | sizeof(struct mmp_pdma_desc_sw), | |
398 | __alignof__(struct mmp_pdma_desc_sw), 0); | |
399 | if (!chan->desc_pool) { | |
400 | dev_err(chan->dev, "unable to allocate descriptor pool\n"); | |
401 | return -ENOMEM; | |
402 | } | |
027f28b7 | 403 | mmp_pdma_free_phy(chan); |
c8acd6aa ZG |
404 | chan->idle = true; |
405 | chan->dev_addr = 0; | |
406 | return 1; | |
407 | } | |
408 | ||
409 | static void mmp_pdma_free_desc_list(struct mmp_pdma_chan *chan, | |
410 | struct list_head *list) | |
411 | { | |
412 | struct mmp_pdma_desc_sw *desc, *_desc; | |
413 | ||
414 | list_for_each_entry_safe(desc, _desc, list, node) { | |
415 | list_del(&desc->node); | |
416 | dma_pool_free(chan->desc_pool, desc, desc->async_tx.phys); | |
417 | } | |
418 | } | |
419 | ||
420 | static void mmp_pdma_free_chan_resources(struct dma_chan *dchan) | |
421 | { | |
422 | struct mmp_pdma_chan *chan = to_mmp_pdma_chan(dchan); | |
423 | unsigned long flags; | |
424 | ||
425 | spin_lock_irqsave(&chan->desc_lock, flags); | |
426 | mmp_pdma_free_desc_list(chan, &chan->chain_pending); | |
427 | mmp_pdma_free_desc_list(chan, &chan->chain_running); | |
428 | spin_unlock_irqrestore(&chan->desc_lock, flags); | |
429 | ||
430 | dma_pool_destroy(chan->desc_pool); | |
431 | chan->desc_pool = NULL; | |
432 | chan->idle = true; | |
433 | chan->dev_addr = 0; | |
027f28b7 | 434 | mmp_pdma_free_phy(chan); |
c8acd6aa ZG |
435 | return; |
436 | } | |
437 | ||
438 | static struct dma_async_tx_descriptor * | |
439 | mmp_pdma_prep_memcpy(struct dma_chan *dchan, | |
440 | dma_addr_t dma_dst, dma_addr_t dma_src, | |
441 | size_t len, unsigned long flags) | |
442 | { | |
443 | struct mmp_pdma_chan *chan; | |
444 | struct mmp_pdma_desc_sw *first = NULL, *prev = NULL, *new; | |
445 | size_t copy = 0; | |
446 | ||
447 | if (!dchan) | |
448 | return NULL; | |
449 | ||
450 | if (!len) | |
451 | return NULL; | |
452 | ||
453 | chan = to_mmp_pdma_chan(dchan); | |
454 | ||
455 | if (!chan->dir) { | |
456 | chan->dir = DMA_MEM_TO_MEM; | |
457 | chan->dcmd = DCMD_INCTRGADDR | DCMD_INCSRCADDR; | |
458 | chan->dcmd |= DCMD_BURST32; | |
459 | } | |
460 | ||
461 | do { | |
462 | /* Allocate the link descriptor from DMA pool */ | |
463 | new = mmp_pdma_alloc_descriptor(chan); | |
464 | if (!new) { | |
465 | dev_err(chan->dev, "no memory for desc\n"); | |
466 | goto fail; | |
467 | } | |
468 | ||
469 | copy = min_t(size_t, len, PDMA_MAX_DESC_BYTES); | |
470 | ||
471 | new->desc.dcmd = chan->dcmd | (DCMD_LENGTH & copy); | |
472 | new->desc.dsadr = dma_src; | |
473 | new->desc.dtadr = dma_dst; | |
474 | ||
475 | if (!first) | |
476 | first = new; | |
477 | else | |
478 | prev->desc.ddadr = new->async_tx.phys; | |
479 | ||
480 | new->async_tx.cookie = 0; | |
481 | async_tx_ack(&new->async_tx); | |
482 | ||
483 | prev = new; | |
484 | len -= copy; | |
485 | ||
486 | if (chan->dir == DMA_MEM_TO_DEV) { | |
487 | dma_src += copy; | |
488 | } else if (chan->dir == DMA_DEV_TO_MEM) { | |
489 | dma_dst += copy; | |
490 | } else if (chan->dir == DMA_MEM_TO_MEM) { | |
491 | dma_src += copy; | |
492 | dma_dst += copy; | |
493 | } | |
494 | ||
495 | /* Insert the link descriptor to the LD ring */ | |
496 | list_add_tail(&new->node, &first->tx_list); | |
497 | } while (len); | |
498 | ||
499 | first->async_tx.flags = flags; /* client is in control of this ack */ | |
500 | first->async_tx.cookie = -EBUSY; | |
501 | ||
502 | /* last desc and fire IRQ */ | |
503 | new->desc.ddadr = DDADR_STOP; | |
504 | new->desc.dcmd |= DCMD_ENDIRQEN; | |
505 | ||
506 | return &first->async_tx; | |
507 | ||
508 | fail: | |
509 | if (first) | |
510 | mmp_pdma_free_desc_list(chan, &first->tx_list); | |
511 | return NULL; | |
512 | } | |
513 | ||
514 | static struct dma_async_tx_descriptor * | |
515 | mmp_pdma_prep_slave_sg(struct dma_chan *dchan, struct scatterlist *sgl, | |
516 | unsigned int sg_len, enum dma_transfer_direction dir, | |
517 | unsigned long flags, void *context) | |
518 | { | |
519 | struct mmp_pdma_chan *chan = to_mmp_pdma_chan(dchan); | |
520 | struct mmp_pdma_desc_sw *first = NULL, *prev = NULL, *new = NULL; | |
521 | size_t len, avail; | |
522 | struct scatterlist *sg; | |
523 | dma_addr_t addr; | |
524 | int i; | |
525 | ||
526 | if ((sgl == NULL) || (sg_len == 0)) | |
527 | return NULL; | |
528 | ||
529 | for_each_sg(sgl, sg, sg_len, i) { | |
530 | addr = sg_dma_address(sg); | |
531 | avail = sg_dma_len(sgl); | |
532 | ||
533 | do { | |
534 | len = min_t(size_t, avail, PDMA_MAX_DESC_BYTES); | |
535 | ||
536 | /* allocate and populate the descriptor */ | |
537 | new = mmp_pdma_alloc_descriptor(chan); | |
538 | if (!new) { | |
539 | dev_err(chan->dev, "no memory for desc\n"); | |
540 | goto fail; | |
541 | } | |
542 | ||
543 | new->desc.dcmd = chan->dcmd | (DCMD_LENGTH & len); | |
544 | if (dir == DMA_MEM_TO_DEV) { | |
545 | new->desc.dsadr = addr; | |
546 | new->desc.dtadr = chan->dev_addr; | |
547 | } else { | |
548 | new->desc.dsadr = chan->dev_addr; | |
549 | new->desc.dtadr = addr; | |
550 | } | |
551 | ||
552 | if (!first) | |
553 | first = new; | |
554 | else | |
555 | prev->desc.ddadr = new->async_tx.phys; | |
556 | ||
557 | new->async_tx.cookie = 0; | |
558 | async_tx_ack(&new->async_tx); | |
559 | prev = new; | |
560 | ||
561 | /* Insert the link descriptor to the LD ring */ | |
562 | list_add_tail(&new->node, &first->tx_list); | |
563 | ||
564 | /* update metadata */ | |
565 | addr += len; | |
566 | avail -= len; | |
567 | } while (avail); | |
568 | } | |
569 | ||
570 | first->async_tx.cookie = -EBUSY; | |
571 | first->async_tx.flags = flags; | |
572 | ||
573 | /* last desc and fire IRQ */ | |
574 | new->desc.ddadr = DDADR_STOP; | |
575 | new->desc.dcmd |= DCMD_ENDIRQEN; | |
576 | ||
577 | return &first->async_tx; | |
578 | ||
579 | fail: | |
580 | if (first) | |
581 | mmp_pdma_free_desc_list(chan, &first->tx_list); | |
582 | return NULL; | |
583 | } | |
584 | ||
585 | static int mmp_pdma_control(struct dma_chan *dchan, enum dma_ctrl_cmd cmd, | |
586 | unsigned long arg) | |
587 | { | |
588 | struct mmp_pdma_chan *chan = to_mmp_pdma_chan(dchan); | |
589 | struct dma_slave_config *cfg = (void *)arg; | |
590 | unsigned long flags; | |
591 | int ret = 0; | |
592 | u32 maxburst = 0, addr = 0; | |
593 | enum dma_slave_buswidth width = DMA_SLAVE_BUSWIDTH_UNDEFINED; | |
594 | ||
595 | if (!dchan) | |
596 | return -EINVAL; | |
597 | ||
598 | switch (cmd) { | |
599 | case DMA_TERMINATE_ALL: | |
600 | disable_chan(chan->phy); | |
027f28b7 | 601 | mmp_pdma_free_phy(chan); |
c8acd6aa ZG |
602 | spin_lock_irqsave(&chan->desc_lock, flags); |
603 | mmp_pdma_free_desc_list(chan, &chan->chain_pending); | |
604 | mmp_pdma_free_desc_list(chan, &chan->chain_running); | |
605 | spin_unlock_irqrestore(&chan->desc_lock, flags); | |
606 | chan->idle = true; | |
607 | break; | |
608 | case DMA_SLAVE_CONFIG: | |
609 | if (cfg->direction == DMA_DEV_TO_MEM) { | |
610 | chan->dcmd = DCMD_INCTRGADDR | DCMD_FLOWSRC; | |
611 | maxburst = cfg->src_maxburst; | |
612 | width = cfg->src_addr_width; | |
613 | addr = cfg->src_addr; | |
614 | } else if (cfg->direction == DMA_MEM_TO_DEV) { | |
615 | chan->dcmd = DCMD_INCSRCADDR | DCMD_FLOWTRG; | |
616 | maxburst = cfg->dst_maxburst; | |
617 | width = cfg->dst_addr_width; | |
618 | addr = cfg->dst_addr; | |
619 | } | |
620 | ||
621 | if (width == DMA_SLAVE_BUSWIDTH_1_BYTE) | |
622 | chan->dcmd |= DCMD_WIDTH1; | |
623 | else if (width == DMA_SLAVE_BUSWIDTH_2_BYTES) | |
624 | chan->dcmd |= DCMD_WIDTH2; | |
625 | else if (width == DMA_SLAVE_BUSWIDTH_4_BYTES) | |
626 | chan->dcmd |= DCMD_WIDTH4; | |
627 | ||
628 | if (maxburst == 8) | |
629 | chan->dcmd |= DCMD_BURST8; | |
630 | else if (maxburst == 16) | |
631 | chan->dcmd |= DCMD_BURST16; | |
632 | else if (maxburst == 32) | |
633 | chan->dcmd |= DCMD_BURST32; | |
634 | ||
ed30933e CD |
635 | chan->dir = cfg->direction; |
636 | chan->drcmr = cfg->slave_id; | |
c8acd6aa ZG |
637 | chan->dev_addr = addr; |
638 | break; | |
639 | default: | |
640 | return -ENOSYS; | |
641 | } | |
642 | ||
643 | return ret; | |
644 | } | |
645 | ||
646 | static enum dma_status mmp_pdma_tx_status(struct dma_chan *dchan, | |
647 | dma_cookie_t cookie, struct dma_tx_state *txstate) | |
648 | { | |
4aa9fe0a | 649 | return dma_cookie_status(dchan, cookie, txstate); |
c8acd6aa ZG |
650 | } |
651 | ||
652 | /** | |
653 | * mmp_pdma_issue_pending - Issue the DMA start command | |
654 | * pending list ==> running list | |
655 | */ | |
656 | static void mmp_pdma_issue_pending(struct dma_chan *dchan) | |
657 | { | |
658 | struct mmp_pdma_chan *chan = to_mmp_pdma_chan(dchan); | |
659 | unsigned long flags; | |
660 | ||
661 | spin_lock_irqsave(&chan->desc_lock, flags); | |
662 | start_pending_queue(chan); | |
663 | spin_unlock_irqrestore(&chan->desc_lock, flags); | |
664 | } | |
665 | ||
666 | /* | |
667 | * dma_do_tasklet | |
668 | * Do call back | |
669 | * Start pending list | |
670 | */ | |
671 | static void dma_do_tasklet(unsigned long data) | |
672 | { | |
673 | struct mmp_pdma_chan *chan = (struct mmp_pdma_chan *)data; | |
674 | struct mmp_pdma_desc_sw *desc, *_desc; | |
675 | LIST_HEAD(chain_cleanup); | |
676 | unsigned long flags; | |
677 | ||
678 | /* submit pending list; callback for each desc; free desc */ | |
679 | ||
680 | spin_lock_irqsave(&chan->desc_lock, flags); | |
681 | ||
682 | /* update the cookie if we have some descriptors to cleanup */ | |
683 | if (!list_empty(&chan->chain_running)) { | |
684 | dma_cookie_t cookie; | |
685 | ||
686 | desc = to_mmp_pdma_desc(chan->chain_running.prev); | |
687 | cookie = desc->async_tx.cookie; | |
688 | dma_cookie_complete(&desc->async_tx); | |
689 | ||
690 | dev_dbg(chan->dev, "completed_cookie=%d\n", cookie); | |
691 | } | |
692 | ||
693 | /* | |
694 | * move the descriptors to a temporary list so we can drop the lock | |
695 | * during the entire cleanup operation | |
696 | */ | |
697 | list_splice_tail_init(&chan->chain_running, &chain_cleanup); | |
698 | ||
699 | /* the hardware is now idle and ready for more */ | |
700 | chan->idle = true; | |
701 | ||
702 | /* Start any pending transactions automatically */ | |
703 | start_pending_queue(chan); | |
704 | spin_unlock_irqrestore(&chan->desc_lock, flags); | |
705 | ||
706 | /* Run the callback for each descriptor, in order */ | |
707 | list_for_each_entry_safe(desc, _desc, &chain_cleanup, node) { | |
708 | struct dma_async_tx_descriptor *txd = &desc->async_tx; | |
709 | ||
710 | /* Remove from the list of transactions */ | |
711 | list_del(&desc->node); | |
712 | /* Run the link descriptor callback function */ | |
713 | if (txd->callback) | |
714 | txd->callback(txd->callback_param); | |
715 | ||
716 | dma_pool_free(chan->desc_pool, desc, txd->phys); | |
717 | } | |
718 | } | |
719 | ||
4bf27b8b | 720 | static int mmp_pdma_remove(struct platform_device *op) |
c8acd6aa ZG |
721 | { |
722 | struct mmp_pdma_device *pdev = platform_get_drvdata(op); | |
723 | ||
724 | dma_async_device_unregister(&pdev->device); | |
725 | return 0; | |
726 | } | |
727 | ||
463a1f8b | 728 | static int mmp_pdma_chan_init(struct mmp_pdma_device *pdev, |
c8acd6aa ZG |
729 | int idx, int irq) |
730 | { | |
731 | struct mmp_pdma_phy *phy = &pdev->phy[idx]; | |
732 | struct mmp_pdma_chan *chan; | |
733 | int ret; | |
734 | ||
735 | chan = devm_kzalloc(pdev->dev, | |
736 | sizeof(struct mmp_pdma_chan), GFP_KERNEL); | |
737 | if (chan == NULL) | |
738 | return -ENOMEM; | |
739 | ||
740 | phy->idx = idx; | |
741 | phy->base = pdev->base; | |
742 | ||
743 | if (irq) { | |
744 | ret = devm_request_irq(pdev->dev, irq, | |
745 | mmp_pdma_chan_handler, IRQF_DISABLED, "pdma", phy); | |
746 | if (ret) { | |
747 | dev_err(pdev->dev, "channel request irq fail!\n"); | |
748 | return ret; | |
749 | } | |
750 | } | |
751 | ||
752 | spin_lock_init(&chan->desc_lock); | |
753 | chan->dev = pdev->dev; | |
754 | chan->chan.device = &pdev->device; | |
755 | tasklet_init(&chan->tasklet, dma_do_tasklet, (unsigned long)chan); | |
756 | INIT_LIST_HEAD(&chan->chain_pending); | |
757 | INIT_LIST_HEAD(&chan->chain_running); | |
758 | ||
759 | /* register virt channel to dma engine */ | |
760 | list_add_tail(&chan->chan.device_node, | |
761 | &pdev->device.channels); | |
762 | ||
763 | return 0; | |
764 | } | |
765 | ||
766 | static struct of_device_id mmp_pdma_dt_ids[] = { | |
767 | { .compatible = "marvell,pdma-1.0", }, | |
768 | {} | |
769 | }; | |
770 | MODULE_DEVICE_TABLE(of, mmp_pdma_dt_ids); | |
771 | ||
463a1f8b | 772 | static int mmp_pdma_probe(struct platform_device *op) |
c8acd6aa ZG |
773 | { |
774 | struct mmp_pdma_device *pdev; | |
775 | const struct of_device_id *of_id; | |
776 | struct mmp_dma_platdata *pdata = dev_get_platdata(&op->dev); | |
777 | struct resource *iores; | |
778 | int i, ret, irq = 0; | |
779 | int dma_channels = 0, irq_num = 0; | |
780 | ||
781 | pdev = devm_kzalloc(&op->dev, sizeof(*pdev), GFP_KERNEL); | |
782 | if (!pdev) | |
783 | return -ENOMEM; | |
784 | pdev->dev = &op->dev; | |
785 | ||
027f28b7 XW |
786 | spin_lock_init(&pdev->phy_lock); |
787 | ||
c8acd6aa ZG |
788 | iores = platform_get_resource(op, IORESOURCE_MEM, 0); |
789 | if (!iores) | |
790 | return -EINVAL; | |
791 | ||
7331205a TR |
792 | pdev->base = devm_ioremap_resource(pdev->dev, iores); |
793 | if (IS_ERR(pdev->base)) | |
794 | return PTR_ERR(pdev->base); | |
c8acd6aa ZG |
795 | |
796 | of_id = of_match_device(mmp_pdma_dt_ids, pdev->dev); | |
797 | if (of_id) | |
798 | of_property_read_u32(pdev->dev->of_node, | |
799 | "#dma-channels", &dma_channels); | |
800 | else if (pdata && pdata->dma_channels) | |
801 | dma_channels = pdata->dma_channels; | |
802 | else | |
803 | dma_channels = 32; /* default 32 channel */ | |
804 | pdev->dma_channels = dma_channels; | |
805 | ||
806 | for (i = 0; i < dma_channels; i++) { | |
807 | if (platform_get_irq(op, i) > 0) | |
808 | irq_num++; | |
809 | } | |
810 | ||
811 | pdev->phy = devm_kzalloc(pdev->dev, | |
812 | dma_channels * sizeof(struct mmp_pdma_chan), GFP_KERNEL); | |
813 | if (pdev->phy == NULL) | |
814 | return -ENOMEM; | |
815 | ||
816 | INIT_LIST_HEAD(&pdev->device.channels); | |
817 | ||
818 | if (irq_num != dma_channels) { | |
819 | /* all chan share one irq, demux inside */ | |
820 | irq = platform_get_irq(op, 0); | |
821 | ret = devm_request_irq(pdev->dev, irq, | |
822 | mmp_pdma_int_handler, IRQF_DISABLED, "pdma", pdev); | |
823 | if (ret) | |
824 | return ret; | |
825 | } | |
826 | ||
827 | for (i = 0; i < dma_channels; i++) { | |
828 | irq = (irq_num != dma_channels) ? 0 : platform_get_irq(op, i); | |
829 | ret = mmp_pdma_chan_init(pdev, i, irq); | |
830 | if (ret) | |
831 | return ret; | |
832 | } | |
833 | ||
834 | dma_cap_set(DMA_SLAVE, pdev->device.cap_mask); | |
835 | dma_cap_set(DMA_MEMCPY, pdev->device.cap_mask); | |
836 | dma_cap_set(DMA_SLAVE, pdev->device.cap_mask); | |
837 | pdev->device.dev = &op->dev; | |
838 | pdev->device.device_alloc_chan_resources = mmp_pdma_alloc_chan_resources; | |
839 | pdev->device.device_free_chan_resources = mmp_pdma_free_chan_resources; | |
840 | pdev->device.device_tx_status = mmp_pdma_tx_status; | |
841 | pdev->device.device_prep_dma_memcpy = mmp_pdma_prep_memcpy; | |
842 | pdev->device.device_prep_slave_sg = mmp_pdma_prep_slave_sg; | |
843 | pdev->device.device_issue_pending = mmp_pdma_issue_pending; | |
844 | pdev->device.device_control = mmp_pdma_control; | |
845 | pdev->device.copy_align = PDMA_ALIGNMENT; | |
846 | ||
847 | if (pdev->dev->coherent_dma_mask) | |
848 | dma_set_mask(pdev->dev, pdev->dev->coherent_dma_mask); | |
849 | else | |
850 | dma_set_mask(pdev->dev, DMA_BIT_MASK(64)); | |
851 | ||
852 | ret = dma_async_device_register(&pdev->device); | |
853 | if (ret) { | |
854 | dev_err(pdev->device.dev, "unable to register\n"); | |
855 | return ret; | |
856 | } | |
857 | ||
858 | dev_info(pdev->device.dev, "initialized\n"); | |
859 | return 0; | |
860 | } | |
861 | ||
862 | static const struct platform_device_id mmp_pdma_id_table[] = { | |
863 | { "mmp-pdma", }, | |
864 | { }, | |
865 | }; | |
866 | ||
867 | static struct platform_driver mmp_pdma_driver = { | |
868 | .driver = { | |
869 | .name = "mmp-pdma", | |
870 | .owner = THIS_MODULE, | |
871 | .of_match_table = mmp_pdma_dt_ids, | |
872 | }, | |
873 | .id_table = mmp_pdma_id_table, | |
874 | .probe = mmp_pdma_probe, | |
a7d6e3ec | 875 | .remove = mmp_pdma_remove, |
c8acd6aa ZG |
876 | }; |
877 | ||
878 | module_platform_driver(mmp_pdma_driver); | |
879 | ||
880 | MODULE_DESCRIPTION("MARVELL MMP Periphera DMA Driver"); | |
881 | MODULE_AUTHOR("Marvell International Ltd."); | |
882 | MODULE_LICENSE("GPL v2"); |