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e8689e63 LW |
1 | /* |
2 | * Copyright (c) 2006 ARM Ltd. | |
3 | * Copyright (c) 2010 ST-Ericsson SA | |
4 | * | |
5 | * Author: Peter Pearse <peter.pearse@arm.com> | |
6 | * Author: Linus Walleij <linus.walleij@stericsson.com> | |
7 | * | |
8 | * This program is free software; you can redistribute it and/or modify it | |
9 | * under the terms of the GNU General Public License as published by the Free | |
10 | * Software Foundation; either version 2 of the License, or (at your option) | |
11 | * any later version. | |
12 | * | |
13 | * This program is distributed in the hope that it will be useful, but WITHOUT | |
14 | * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or | |
15 | * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for | |
16 | * more details. | |
17 | * | |
18 | * You should have received a copy of the GNU General Public License along with | |
19 | * this program; if not, write to the Free Software Foundation, Inc., 59 | |
20 | * Temple Place - Suite 330, Boston, MA 02111-1307, USA. | |
21 | * | |
e8b5e11d | 22 | * The full GNU General Public License is in this distribution in the |
e8689e63 LW |
23 | * file called COPYING. |
24 | * | |
25 | * Documentation: ARM DDI 0196G == PL080 | |
26 | * Documentation: ARM DDI 0218E == PL081 | |
27 | * | |
28 | * PL080 & PL081 both have 16 sets of DMA signals that can be routed to | |
29 | * any channel. | |
30 | * | |
31 | * The PL080 has 8 channels available for simultaneous use, and the PL081 | |
32 | * has only two channels. So on these DMA controllers the number of channels | |
33 | * and the number of incoming DMA signals are two totally different things. | |
34 | * It is usually not possible to theoretically handle all physical signals, | |
35 | * so a multiplexing scheme with possible denial of use is necessary. | |
36 | * | |
37 | * The PL080 has a dual bus master, PL081 has a single master. | |
38 | * | |
39 | * Memory to peripheral transfer may be visualized as | |
40 | * Get data from memory to DMAC | |
41 | * Until no data left | |
42 | * On burst request from peripheral | |
43 | * Destination burst from DMAC to peripheral | |
44 | * Clear burst request | |
45 | * Raise terminal count interrupt | |
46 | * | |
47 | * For peripherals with a FIFO: | |
48 | * Source burst size == half the depth of the peripheral FIFO | |
49 | * Destination burst size == the depth of the peripheral FIFO | |
50 | * | |
51 | * (Bursts are irrelevant for mem to mem transfers - there are no burst | |
52 | * signals, the DMA controller will simply facilitate its AHB master.) | |
53 | * | |
54 | * ASSUMES default (little) endianness for DMA transfers | |
55 | * | |
9dc2c200 RKAL |
56 | * The PL08x has two flow control settings: |
57 | * - DMAC flow control: the transfer size defines the number of transfers | |
58 | * which occur for the current LLI entry, and the DMAC raises TC at the | |
59 | * end of every LLI entry. Observed behaviour shows the DMAC listening | |
60 | * to both the BREQ and SREQ signals (contrary to documented), | |
61 | * transferring data if either is active. The LBREQ and LSREQ signals | |
62 | * are ignored. | |
63 | * | |
64 | * - Peripheral flow control: the transfer size is ignored (and should be | |
65 | * zero). The data is transferred from the current LLI entry, until | |
66 | * after the final transfer signalled by LBREQ or LSREQ. The DMAC | |
67 | * will then move to the next LLI entry. | |
68 | * | |
69 | * Only the former works sanely with scatter lists, so we only implement | |
70 | * the DMAC flow control method. However, peripherals which use the LBREQ | |
71 | * and LSREQ signals (eg, MMCI) are unable to use this mode, which through | |
72 | * these hardware restrictions prevents them from using scatter DMA. | |
e8689e63 LW |
73 | * |
74 | * Global TODO: | |
75 | * - Break out common code from arch/arm/mach-s3c64xx and share | |
76 | */ | |
77 | #include <linux/device.h> | |
78 | #include <linux/init.h> | |
79 | #include <linux/module.h> | |
e8689e63 LW |
80 | #include <linux/interrupt.h> |
81 | #include <linux/slab.h> | |
82 | #include <linux/dmapool.h> | |
e8689e63 | 83 | #include <linux/dmaengine.h> |
730404ac | 84 | #include <linux/amba/bus.h> |
e8689e63 LW |
85 | #include <linux/amba/pl08x.h> |
86 | #include <linux/debugfs.h> | |
87 | #include <linux/seq_file.h> | |
88 | ||
89 | #include <asm/hardware/pl080.h> | |
e8689e63 LW |
90 | |
91 | #define DRIVER_NAME "pl08xdmac" | |
92 | ||
93 | /** | |
94 | * struct vendor_data - vendor-specific config parameters | |
e8b5e11d | 95 | * for PL08x derivatives |
e8689e63 LW |
96 | * @channels: the number of channels available in this variant |
97 | * @dualmaster: whether this version supports dual AHB masters | |
98 | * or not. | |
99 | */ | |
100 | struct vendor_data { | |
e8689e63 LW |
101 | u8 channels; |
102 | bool dualmaster; | |
103 | }; | |
104 | ||
105 | /* | |
106 | * PL08X private data structures | |
e8b5e11d | 107 | * An LLI struct - see PL08x TRM. Note that next uses bit[0] as a bus bit, |
e25761d7 RKAL |
108 | * start & end do not - their bus bit info is in cctl. Also note that these |
109 | * are fixed 32-bit quantities. | |
e8689e63 | 110 | */ |
7cb72ad9 | 111 | struct pl08x_lli { |
e25761d7 RKAL |
112 | u32 src; |
113 | u32 dst; | |
bfddfb45 | 114 | u32 lli; |
e8689e63 LW |
115 | u32 cctl; |
116 | }; | |
117 | ||
118 | /** | |
119 | * struct pl08x_driver_data - the local state holder for the PL08x | |
120 | * @slave: slave engine for this instance | |
121 | * @memcpy: memcpy engine for this instance | |
122 | * @base: virtual memory base (remapped) for the PL08x | |
123 | * @adev: the corresponding AMBA (PrimeCell) bus entry | |
124 | * @vd: vendor data for this PL08x variant | |
125 | * @pd: platform data passed in from the platform/machine | |
126 | * @phy_chans: array of data for the physical channels | |
127 | * @pool: a pool for the LLI descriptors | |
128 | * @pool_ctr: counter of LLIs in the pool | |
129 | * @lock: a spinlock for this struct | |
130 | */ | |
131 | struct pl08x_driver_data { | |
132 | struct dma_device slave; | |
133 | struct dma_device memcpy; | |
134 | void __iomem *base; | |
135 | struct amba_device *adev; | |
f96ca9ec | 136 | const struct vendor_data *vd; |
e8689e63 LW |
137 | struct pl08x_platform_data *pd; |
138 | struct pl08x_phy_chan *phy_chans; | |
139 | struct dma_pool *pool; | |
140 | int pool_ctr; | |
141 | spinlock_t lock; | |
142 | }; | |
143 | ||
144 | /* | |
145 | * PL08X specific defines | |
146 | */ | |
147 | ||
148 | /* | |
149 | * Memory boundaries: the manual for PL08x says that the controller | |
150 | * cannot read past a 1KiB boundary, so these defines are used to | |
151 | * create transfer LLIs that do not cross such boundaries. | |
152 | */ | |
153 | #define PL08X_BOUNDARY_SHIFT (10) /* 1KB 0x400 */ | |
154 | #define PL08X_BOUNDARY_SIZE (1 << PL08X_BOUNDARY_SHIFT) | |
155 | ||
156 | /* Minimum period between work queue runs */ | |
157 | #define PL08X_WQ_PERIODMIN 20 | |
158 | ||
159 | /* Size (bytes) of each LLI buffer allocated for one transfer */ | |
160 | # define PL08X_LLI_TSFR_SIZE 0x2000 | |
161 | ||
e8b5e11d | 162 | /* Maximum times we call dma_pool_alloc on this pool without freeing */ |
e8689e63 | 163 | #define PL08X_MAX_ALLOCS 0x40 |
7cb72ad9 | 164 | #define MAX_NUM_TSFR_LLIS (PL08X_LLI_TSFR_SIZE/sizeof(struct pl08x_lli)) |
e8689e63 LW |
165 | #define PL08X_ALIGN 8 |
166 | ||
167 | static inline struct pl08x_dma_chan *to_pl08x_chan(struct dma_chan *chan) | |
168 | { | |
169 | return container_of(chan, struct pl08x_dma_chan, chan); | |
170 | } | |
171 | ||
172 | /* | |
173 | * Physical channel handling | |
174 | */ | |
175 | ||
176 | /* Whether a certain channel is busy or not */ | |
177 | static int pl08x_phy_channel_busy(struct pl08x_phy_chan *ch) | |
178 | { | |
179 | unsigned int val; | |
180 | ||
181 | val = readl(ch->base + PL080_CH_CONFIG); | |
182 | return val & PL080_CONFIG_ACTIVE; | |
183 | } | |
184 | ||
185 | /* | |
186 | * Set the initial DMA register values i.e. those for the first LLI | |
e8b5e11d | 187 | * The next LLI pointer and the configuration interrupt bit have |
c885bee4 RKAL |
188 | * been set when the LLIs were constructed. Poke them into the hardware |
189 | * and start the transfer. | |
e8689e63 | 190 | */ |
c885bee4 RKAL |
191 | static void pl08x_start_txd(struct pl08x_dma_chan *plchan, |
192 | struct pl08x_txd *txd) | |
e8689e63 | 193 | { |
c885bee4 | 194 | struct pl08x_driver_data *pl08x = plchan->host; |
e8689e63 | 195 | struct pl08x_phy_chan *phychan = plchan->phychan; |
19524d77 | 196 | struct pl08x_lli *lli = &txd->llis_va[0]; |
09b3c323 | 197 | u32 val; |
c885bee4 RKAL |
198 | |
199 | plchan->at = txd; | |
e8689e63 | 200 | |
c885bee4 RKAL |
201 | /* Wait for channel inactive */ |
202 | while (pl08x_phy_channel_busy(phychan)) | |
203 | cpu_relax(); | |
e8689e63 | 204 | |
c885bee4 RKAL |
205 | dev_vdbg(&pl08x->adev->dev, |
206 | "WRITE channel %d: csrc=0x%08x, cdst=0x%08x, " | |
19524d77 RKAL |
207 | "clli=0x%08x, cctl=0x%08x, ccfg=0x%08x\n", |
208 | phychan->id, lli->src, lli->dst, lli->lli, lli->cctl, | |
09b3c323 | 209 | txd->ccfg); |
19524d77 RKAL |
210 | |
211 | writel(lli->src, phychan->base + PL080_CH_SRC_ADDR); | |
212 | writel(lli->dst, phychan->base + PL080_CH_DST_ADDR); | |
213 | writel(lli->lli, phychan->base + PL080_CH_LLI); | |
214 | writel(lli->cctl, phychan->base + PL080_CH_CONTROL); | |
09b3c323 | 215 | writel(txd->ccfg, phychan->base + PL080_CH_CONFIG); |
c885bee4 RKAL |
216 | |
217 | /* Enable the DMA channel */ | |
218 | /* Do not access config register until channel shows as disabled */ | |
219 | while (readl(pl08x->base + PL080_EN_CHAN) & (1 << phychan->id)) | |
19386b32 | 220 | cpu_relax(); |
e8689e63 | 221 | |
c885bee4 RKAL |
222 | /* Do not access config register until channel shows as inactive */ |
223 | val = readl(phychan->base + PL080_CH_CONFIG); | |
e8689e63 | 224 | while ((val & PL080_CONFIG_ACTIVE) || (val & PL080_CONFIG_ENABLE)) |
c885bee4 | 225 | val = readl(phychan->base + PL080_CH_CONFIG); |
e8689e63 | 226 | |
c885bee4 | 227 | writel(val | PL080_CONFIG_ENABLE, phychan->base + PL080_CH_CONFIG); |
e8689e63 LW |
228 | } |
229 | ||
230 | /* | |
231 | * Overall DMAC remains enabled always. | |
232 | * | |
233 | * Disabling individual channels could lose data. | |
234 | * | |
235 | * Disable the peripheral DMA after disabling the DMAC | |
236 | * in order to allow the DMAC FIFO to drain, and | |
237 | * hence allow the channel to show inactive | |
238 | * | |
239 | */ | |
240 | static void pl08x_pause_phy_chan(struct pl08x_phy_chan *ch) | |
241 | { | |
242 | u32 val; | |
243 | ||
244 | /* Set the HALT bit and wait for the FIFO to drain */ | |
245 | val = readl(ch->base + PL080_CH_CONFIG); | |
246 | val |= PL080_CONFIG_HALT; | |
247 | writel(val, ch->base + PL080_CH_CONFIG); | |
248 | ||
249 | /* Wait for channel inactive */ | |
250 | while (pl08x_phy_channel_busy(ch)) | |
19386b32 | 251 | cpu_relax(); |
e8689e63 LW |
252 | } |
253 | ||
254 | static void pl08x_resume_phy_chan(struct pl08x_phy_chan *ch) | |
255 | { | |
256 | u32 val; | |
257 | ||
258 | /* Clear the HALT bit */ | |
259 | val = readl(ch->base + PL080_CH_CONFIG); | |
260 | val &= ~PL080_CONFIG_HALT; | |
261 | writel(val, ch->base + PL080_CH_CONFIG); | |
262 | } | |
263 | ||
264 | ||
265 | /* Stops the channel */ | |
266 | static void pl08x_stop_phy_chan(struct pl08x_phy_chan *ch) | |
267 | { | |
268 | u32 val; | |
269 | ||
270 | pl08x_pause_phy_chan(ch); | |
271 | ||
272 | /* Disable channel */ | |
273 | val = readl(ch->base + PL080_CH_CONFIG); | |
274 | val &= ~PL080_CONFIG_ENABLE; | |
275 | val &= ~PL080_CONFIG_ERR_IRQ_MASK; | |
276 | val &= ~PL080_CONFIG_TC_IRQ_MASK; | |
277 | writel(val, ch->base + PL080_CH_CONFIG); | |
278 | } | |
279 | ||
280 | static inline u32 get_bytes_in_cctl(u32 cctl) | |
281 | { | |
282 | /* The source width defines the number of bytes */ | |
283 | u32 bytes = cctl & PL080_CONTROL_TRANSFER_SIZE_MASK; | |
284 | ||
285 | switch (cctl >> PL080_CONTROL_SWIDTH_SHIFT) { | |
286 | case PL080_WIDTH_8BIT: | |
287 | break; | |
288 | case PL080_WIDTH_16BIT: | |
289 | bytes *= 2; | |
290 | break; | |
291 | case PL080_WIDTH_32BIT: | |
292 | bytes *= 4; | |
293 | break; | |
294 | } | |
295 | return bytes; | |
296 | } | |
297 | ||
298 | /* The channel should be paused when calling this */ | |
299 | static u32 pl08x_getbytes_chan(struct pl08x_dma_chan *plchan) | |
300 | { | |
301 | struct pl08x_phy_chan *ch; | |
e8689e63 LW |
302 | struct pl08x_txd *txd; |
303 | unsigned long flags; | |
cace6585 | 304 | size_t bytes = 0; |
e8689e63 LW |
305 | |
306 | spin_lock_irqsave(&plchan->lock, flags); | |
e8689e63 LW |
307 | ch = plchan->phychan; |
308 | txd = plchan->at; | |
309 | ||
310 | /* | |
db9f136a RKAL |
311 | * Follow the LLIs to get the number of remaining |
312 | * bytes in the currently active transaction. | |
e8689e63 LW |
313 | */ |
314 | if (ch && txd) { | |
4c0df6a3 | 315 | u32 clli = readl(ch->base + PL080_CH_LLI) & ~PL080_LLI_LM_AHB2; |
e8689e63 | 316 | |
db9f136a | 317 | /* First get the remaining bytes in the active transfer */ |
e8689e63 LW |
318 | bytes = get_bytes_in_cctl(readl(ch->base + PL080_CH_CONTROL)); |
319 | ||
320 | if (clli) { | |
db9f136a RKAL |
321 | struct pl08x_lli *llis_va = txd->llis_va; |
322 | dma_addr_t llis_bus = txd->llis_bus; | |
323 | int index; | |
324 | ||
325 | BUG_ON(clli < llis_bus || clli >= llis_bus + | |
326 | sizeof(struct pl08x_lli) * MAX_NUM_TSFR_LLIS); | |
e8689e63 | 327 | |
db9f136a RKAL |
328 | /* |
329 | * Locate the next LLI - as this is an array, | |
330 | * it's simple maths to find. | |
331 | */ | |
332 | index = (clli - llis_bus) / sizeof(struct pl08x_lli); | |
333 | ||
334 | for (; index < MAX_NUM_TSFR_LLIS; index++) { | |
335 | bytes += get_bytes_in_cctl(llis_va[index].cctl); | |
e8689e63 | 336 | |
e8689e63 | 337 | /* |
e8b5e11d | 338 | * A LLI pointer of 0 terminates the LLI list |
e8689e63 | 339 | */ |
db9f136a RKAL |
340 | if (!llis_va[index].lli) |
341 | break; | |
e8689e63 LW |
342 | } |
343 | } | |
344 | } | |
345 | ||
346 | /* Sum up all queued transactions */ | |
347 | if (!list_empty(&plchan->desc_list)) { | |
db9f136a | 348 | struct pl08x_txd *txdi; |
e8689e63 LW |
349 | list_for_each_entry(txdi, &plchan->desc_list, node) { |
350 | bytes += txdi->len; | |
351 | } | |
e8689e63 LW |
352 | } |
353 | ||
354 | spin_unlock_irqrestore(&plchan->lock, flags); | |
355 | ||
356 | return bytes; | |
357 | } | |
358 | ||
359 | /* | |
360 | * Allocate a physical channel for a virtual channel | |
361 | */ | |
362 | static struct pl08x_phy_chan * | |
363 | pl08x_get_phy_channel(struct pl08x_driver_data *pl08x, | |
364 | struct pl08x_dma_chan *virt_chan) | |
365 | { | |
366 | struct pl08x_phy_chan *ch = NULL; | |
367 | unsigned long flags; | |
368 | int i; | |
369 | ||
370 | /* | |
371 | * Try to locate a physical channel to be used for | |
372 | * this transfer. If all are taken return NULL and | |
373 | * the requester will have to cope by using some fallback | |
374 | * PIO mode or retrying later. | |
375 | */ | |
376 | for (i = 0; i < pl08x->vd->channels; i++) { | |
377 | ch = &pl08x->phy_chans[i]; | |
378 | ||
379 | spin_lock_irqsave(&ch->lock, flags); | |
380 | ||
381 | if (!ch->serving) { | |
382 | ch->serving = virt_chan; | |
383 | ch->signal = -1; | |
384 | spin_unlock_irqrestore(&ch->lock, flags); | |
385 | break; | |
386 | } | |
387 | ||
388 | spin_unlock_irqrestore(&ch->lock, flags); | |
389 | } | |
390 | ||
391 | if (i == pl08x->vd->channels) { | |
392 | /* No physical channel available, cope with it */ | |
393 | return NULL; | |
394 | } | |
395 | ||
396 | return ch; | |
397 | } | |
398 | ||
399 | static inline void pl08x_put_phy_channel(struct pl08x_driver_data *pl08x, | |
400 | struct pl08x_phy_chan *ch) | |
401 | { | |
402 | unsigned long flags; | |
403 | ||
404 | /* Stop the channel and clear its interrupts */ | |
405 | pl08x_stop_phy_chan(ch); | |
406 | writel((1 << ch->id), pl08x->base + PL080_ERR_CLEAR); | |
407 | writel((1 << ch->id), pl08x->base + PL080_TC_CLEAR); | |
408 | ||
409 | /* Mark it as free */ | |
410 | spin_lock_irqsave(&ch->lock, flags); | |
411 | ch->serving = NULL; | |
412 | spin_unlock_irqrestore(&ch->lock, flags); | |
413 | } | |
414 | ||
415 | /* | |
416 | * LLI handling | |
417 | */ | |
418 | ||
419 | static inline unsigned int pl08x_get_bytes_for_cctl(unsigned int coded) | |
420 | { | |
421 | switch (coded) { | |
422 | case PL080_WIDTH_8BIT: | |
423 | return 1; | |
424 | case PL080_WIDTH_16BIT: | |
425 | return 2; | |
426 | case PL080_WIDTH_32BIT: | |
427 | return 4; | |
428 | default: | |
429 | break; | |
430 | } | |
431 | BUG(); | |
432 | return 0; | |
433 | } | |
434 | ||
435 | static inline u32 pl08x_cctl_bits(u32 cctl, u8 srcwidth, u8 dstwidth, | |
cace6585 | 436 | size_t tsize) |
e8689e63 LW |
437 | { |
438 | u32 retbits = cctl; | |
439 | ||
e8b5e11d | 440 | /* Remove all src, dst and transfer size bits */ |
e8689e63 LW |
441 | retbits &= ~PL080_CONTROL_DWIDTH_MASK; |
442 | retbits &= ~PL080_CONTROL_SWIDTH_MASK; | |
443 | retbits &= ~PL080_CONTROL_TRANSFER_SIZE_MASK; | |
444 | ||
445 | /* Then set the bits according to the parameters */ | |
446 | switch (srcwidth) { | |
447 | case 1: | |
448 | retbits |= PL080_WIDTH_8BIT << PL080_CONTROL_SWIDTH_SHIFT; | |
449 | break; | |
450 | case 2: | |
451 | retbits |= PL080_WIDTH_16BIT << PL080_CONTROL_SWIDTH_SHIFT; | |
452 | break; | |
453 | case 4: | |
454 | retbits |= PL080_WIDTH_32BIT << PL080_CONTROL_SWIDTH_SHIFT; | |
455 | break; | |
456 | default: | |
457 | BUG(); | |
458 | break; | |
459 | } | |
460 | ||
461 | switch (dstwidth) { | |
462 | case 1: | |
463 | retbits |= PL080_WIDTH_8BIT << PL080_CONTROL_DWIDTH_SHIFT; | |
464 | break; | |
465 | case 2: | |
466 | retbits |= PL080_WIDTH_16BIT << PL080_CONTROL_DWIDTH_SHIFT; | |
467 | break; | |
468 | case 4: | |
469 | retbits |= PL080_WIDTH_32BIT << PL080_CONTROL_DWIDTH_SHIFT; | |
470 | break; | |
471 | default: | |
472 | BUG(); | |
473 | break; | |
474 | } | |
475 | ||
476 | retbits |= tsize << PL080_CONTROL_TRANSFER_SIZE_SHIFT; | |
477 | return retbits; | |
478 | } | |
479 | ||
480 | /* | |
481 | * Autoselect a master bus to use for the transfer | |
482 | * this prefers the destination bus if both available | |
483 | * if fixed address on one bus the other will be chosen | |
484 | */ | |
3e2a037c | 485 | static void pl08x_choose_master_bus(struct pl08x_bus_data *src_bus, |
e8689e63 LW |
486 | struct pl08x_bus_data *dst_bus, struct pl08x_bus_data **mbus, |
487 | struct pl08x_bus_data **sbus, u32 cctl) | |
488 | { | |
489 | if (!(cctl & PL080_CONTROL_DST_INCR)) { | |
490 | *mbus = src_bus; | |
491 | *sbus = dst_bus; | |
492 | } else if (!(cctl & PL080_CONTROL_SRC_INCR)) { | |
493 | *mbus = dst_bus; | |
494 | *sbus = src_bus; | |
495 | } else { | |
496 | if (dst_bus->buswidth == 4) { | |
497 | *mbus = dst_bus; | |
498 | *sbus = src_bus; | |
499 | } else if (src_bus->buswidth == 4) { | |
500 | *mbus = src_bus; | |
501 | *sbus = dst_bus; | |
502 | } else if (dst_bus->buswidth == 2) { | |
503 | *mbus = dst_bus; | |
504 | *sbus = src_bus; | |
505 | } else if (src_bus->buswidth == 2) { | |
506 | *mbus = src_bus; | |
507 | *sbus = dst_bus; | |
508 | } else { | |
509 | /* src_bus->buswidth == 1 */ | |
510 | *mbus = dst_bus; | |
511 | *sbus = src_bus; | |
512 | } | |
513 | } | |
514 | } | |
515 | ||
516 | /* | |
517 | * Fills in one LLI for a certain transfer descriptor | |
518 | * and advance the counter | |
519 | */ | |
3e2a037c | 520 | static int pl08x_fill_lli_for_desc(struct pl08x_driver_data *pl08x, |
e8689e63 LW |
521 | struct pl08x_txd *txd, int num_llis, int len, |
522 | u32 cctl, u32 *remainder) | |
523 | { | |
7cb72ad9 | 524 | struct pl08x_lli *llis_va = txd->llis_va; |
56b61882 | 525 | dma_addr_t llis_bus = txd->llis_bus; |
e8689e63 LW |
526 | |
527 | BUG_ON(num_llis >= MAX_NUM_TSFR_LLIS); | |
528 | ||
529 | llis_va[num_llis].cctl = cctl; | |
530 | llis_va[num_llis].src = txd->srcbus.addr; | |
531 | llis_va[num_llis].dst = txd->dstbus.addr; | |
532 | ||
533 | /* | |
534 | * On versions with dual masters, you can optionally AND on | |
535 | * PL080_LLI_LM_AHB2 to the LLI to tell the hardware to read | |
536 | * in new LLIs with that controller, but we always try to | |
537 | * choose AHB1 to point into memory. The idea is to have AHB2 | |
538 | * fixed on the peripheral and AHB1 messing around in the | |
539 | * memory. So we don't manipulate this bit currently. | |
540 | */ | |
541 | ||
bfddfb45 | 542 | llis_va[num_llis].lli = llis_bus + (num_llis + 1) * sizeof(struct pl08x_lli); |
e8689e63 LW |
543 | |
544 | if (cctl & PL080_CONTROL_SRC_INCR) | |
545 | txd->srcbus.addr += len; | |
546 | if (cctl & PL080_CONTROL_DST_INCR) | |
547 | txd->dstbus.addr += len; | |
548 | ||
cace6585 RKAL |
549 | BUG_ON(*remainder < len); |
550 | ||
e8689e63 LW |
551 | *remainder -= len; |
552 | ||
553 | return num_llis + 1; | |
554 | } | |
555 | ||
556 | /* | |
557 | * Return number of bytes to fill to boundary, or len | |
558 | */ | |
cace6585 | 559 | static inline size_t pl08x_pre_boundary(u32 addr, size_t len) |
e8689e63 LW |
560 | { |
561 | u32 boundary; | |
562 | ||
563 | boundary = ((addr >> PL08X_BOUNDARY_SHIFT) + 1) | |
564 | << PL08X_BOUNDARY_SHIFT; | |
565 | ||
566 | if (boundary < addr + len) | |
567 | return boundary - addr; | |
568 | else | |
569 | return len; | |
570 | } | |
571 | ||
572 | /* | |
573 | * This fills in the table of LLIs for the transfer descriptor | |
574 | * Note that we assume we never have to change the burst sizes | |
575 | * Return 0 for error | |
576 | */ | |
577 | static int pl08x_fill_llis_for_desc(struct pl08x_driver_data *pl08x, | |
578 | struct pl08x_txd *txd) | |
579 | { | |
e8689e63 | 580 | struct pl08x_bus_data *mbus, *sbus; |
cace6585 | 581 | size_t remainder; |
e8689e63 LW |
582 | int num_llis = 0; |
583 | u32 cctl; | |
cace6585 RKAL |
584 | size_t max_bytes_per_lli; |
585 | size_t total_bytes = 0; | |
7cb72ad9 | 586 | struct pl08x_lli *llis_va; |
e8689e63 | 587 | |
e8689e63 LW |
588 | txd->llis_va = dma_pool_alloc(pl08x->pool, GFP_NOWAIT, |
589 | &txd->llis_bus); | |
590 | if (!txd->llis_va) { | |
591 | dev_err(&pl08x->adev->dev, "%s no memory for llis\n", __func__); | |
592 | return 0; | |
593 | } | |
594 | ||
595 | pl08x->pool_ctr++; | |
596 | ||
70b5ed6b RKAL |
597 | /* Get the default CCTL */ |
598 | cctl = txd->cctl; | |
e8689e63 LW |
599 | |
600 | /* | |
601 | * On the PL080 we have two bus masters and we | |
602 | * should select one for source and one for | |
603 | * destination. We try to use AHB2 for the | |
604 | * bus which does not increment (typically the | |
605 | * peripheral) else we just choose something. | |
606 | */ | |
607 | cctl &= ~(PL080_CONTROL_DST_AHB2 | PL080_CONTROL_SRC_AHB2); | |
608 | if (pl08x->vd->dualmaster) { | |
609 | if (cctl & PL080_CONTROL_SRC_INCR) | |
610 | /* Source increments, use AHB2 for destination */ | |
611 | cctl |= PL080_CONTROL_DST_AHB2; | |
612 | else if (cctl & PL080_CONTROL_DST_INCR) | |
613 | /* Destination increments, use AHB2 for source */ | |
614 | cctl |= PL080_CONTROL_SRC_AHB2; | |
615 | else | |
616 | /* Just pick something, source AHB1 dest AHB2 */ | |
617 | cctl |= PL080_CONTROL_DST_AHB2; | |
618 | } | |
619 | ||
620 | /* Find maximum width of the source bus */ | |
621 | txd->srcbus.maxwidth = | |
622 | pl08x_get_bytes_for_cctl((cctl & PL080_CONTROL_SWIDTH_MASK) >> | |
623 | PL080_CONTROL_SWIDTH_SHIFT); | |
624 | ||
625 | /* Find maximum width of the destination bus */ | |
626 | txd->dstbus.maxwidth = | |
627 | pl08x_get_bytes_for_cctl((cctl & PL080_CONTROL_DWIDTH_MASK) >> | |
628 | PL080_CONTROL_DWIDTH_SHIFT); | |
629 | ||
630 | /* Set up the bus widths to the maximum */ | |
631 | txd->srcbus.buswidth = txd->srcbus.maxwidth; | |
632 | txd->dstbus.buswidth = txd->dstbus.maxwidth; | |
633 | dev_vdbg(&pl08x->adev->dev, | |
634 | "%s source bus is %d bytes wide, dest bus is %d bytes wide\n", | |
635 | __func__, txd->srcbus.buswidth, txd->dstbus.buswidth); | |
636 | ||
637 | ||
638 | /* | |
639 | * Bytes transferred == tsize * MIN(buswidths), not max(buswidths) | |
640 | */ | |
641 | max_bytes_per_lli = min(txd->srcbus.buswidth, txd->dstbus.buswidth) * | |
642 | PL080_CONTROL_TRANSFER_SIZE_MASK; | |
643 | dev_vdbg(&pl08x->adev->dev, | |
cace6585 | 644 | "%s max bytes per lli = %zu\n", |
e8689e63 LW |
645 | __func__, max_bytes_per_lli); |
646 | ||
647 | /* We need to count this down to zero */ | |
648 | remainder = txd->len; | |
649 | dev_vdbg(&pl08x->adev->dev, | |
cace6585 | 650 | "%s remainder = %zu\n", |
e8689e63 LW |
651 | __func__, remainder); |
652 | ||
653 | /* | |
654 | * Choose bus to align to | |
655 | * - prefers destination bus if both available | |
656 | * - if fixed address on one bus chooses other | |
e8b5e11d | 657 | * - modifies cctl to choose an appropriate master |
e8689e63 LW |
658 | */ |
659 | pl08x_choose_master_bus(&txd->srcbus, &txd->dstbus, | |
660 | &mbus, &sbus, cctl); | |
661 | ||
662 | ||
663 | /* | |
664 | * The lowest bit of the LLI register | |
665 | * is also used to indicate which master to | |
666 | * use for reading the LLIs. | |
667 | */ | |
668 | ||
669 | if (txd->len < mbus->buswidth) { | |
670 | /* | |
671 | * Less than a bus width available | |
672 | * - send as single bytes | |
673 | */ | |
674 | while (remainder) { | |
675 | dev_vdbg(&pl08x->adev->dev, | |
676 | "%s single byte LLIs for a transfer of " | |
9c132992 | 677 | "less than a bus width (remain 0x%08x)\n", |
e8689e63 LW |
678 | __func__, remainder); |
679 | cctl = pl08x_cctl_bits(cctl, 1, 1, 1); | |
680 | num_llis = | |
681 | pl08x_fill_lli_for_desc(pl08x, txd, num_llis, 1, | |
682 | cctl, &remainder); | |
683 | total_bytes++; | |
684 | } | |
685 | } else { | |
686 | /* | |
687 | * Make one byte LLIs until master bus is aligned | |
688 | * - slave will then be aligned also | |
689 | */ | |
690 | while ((mbus->addr) % (mbus->buswidth)) { | |
691 | dev_vdbg(&pl08x->adev->dev, | |
692 | "%s adjustment lli for less than bus width " | |
9c132992 | 693 | "(remain 0x%08x)\n", |
e8689e63 LW |
694 | __func__, remainder); |
695 | cctl = pl08x_cctl_bits(cctl, 1, 1, 1); | |
696 | num_llis = pl08x_fill_lli_for_desc | |
697 | (pl08x, txd, num_llis, 1, cctl, &remainder); | |
698 | total_bytes++; | |
699 | } | |
700 | ||
701 | /* | |
702 | * Master now aligned | |
703 | * - if slave is not then we must set its width down | |
704 | */ | |
705 | if (sbus->addr % sbus->buswidth) { | |
706 | dev_dbg(&pl08x->adev->dev, | |
707 | "%s set down bus width to one byte\n", | |
708 | __func__); | |
709 | ||
710 | sbus->buswidth = 1; | |
711 | } | |
712 | ||
713 | /* | |
714 | * Make largest possible LLIs until less than one bus | |
715 | * width left | |
716 | */ | |
717 | while (remainder > (mbus->buswidth - 1)) { | |
cace6585 | 718 | size_t lli_len, target_len, tsize, odd_bytes; |
e8689e63 LW |
719 | |
720 | /* | |
721 | * If enough left try to send max possible, | |
722 | * otherwise try to send the remainder | |
723 | */ | |
724 | target_len = remainder; | |
725 | if (remainder > max_bytes_per_lli) | |
726 | target_len = max_bytes_per_lli; | |
727 | ||
728 | /* | |
e8b5e11d | 729 | * Set bus lengths for incrementing buses |
e8689e63 LW |
730 | * to number of bytes which fill to next memory |
731 | * boundary | |
732 | */ | |
733 | if (cctl & PL080_CONTROL_SRC_INCR) | |
734 | txd->srcbus.fill_bytes = | |
735 | pl08x_pre_boundary( | |
736 | txd->srcbus.addr, | |
737 | remainder); | |
738 | else | |
739 | txd->srcbus.fill_bytes = | |
740 | max_bytes_per_lli; | |
741 | ||
742 | if (cctl & PL080_CONTROL_DST_INCR) | |
743 | txd->dstbus.fill_bytes = | |
744 | pl08x_pre_boundary( | |
745 | txd->dstbus.addr, | |
746 | remainder); | |
747 | else | |
748 | txd->dstbus.fill_bytes = | |
749 | max_bytes_per_lli; | |
750 | ||
751 | /* | |
752 | * Find the nearest | |
753 | */ | |
754 | lli_len = min(txd->srcbus.fill_bytes, | |
755 | txd->dstbus.fill_bytes); | |
756 | ||
757 | BUG_ON(lli_len > remainder); | |
758 | ||
759 | if (lli_len <= 0) { | |
760 | dev_err(&pl08x->adev->dev, | |
cace6585 | 761 | "%s lli_len is %zu, <= 0\n", |
e8689e63 LW |
762 | __func__, lli_len); |
763 | return 0; | |
764 | } | |
765 | ||
766 | if (lli_len == target_len) { | |
767 | /* | |
768 | * Can send what we wanted | |
769 | */ | |
770 | /* | |
771 | * Maintain alignment | |
772 | */ | |
773 | lli_len = (lli_len/mbus->buswidth) * | |
774 | mbus->buswidth; | |
775 | odd_bytes = 0; | |
776 | } else { | |
777 | /* | |
778 | * So now we know how many bytes to transfer | |
779 | * to get to the nearest boundary | |
e8b5e11d | 780 | * The next LLI will past the boundary |
e8689e63 LW |
781 | * - however we may be working to a boundary |
782 | * on the slave bus | |
783 | * We need to ensure the master stays aligned | |
784 | */ | |
785 | odd_bytes = lli_len % mbus->buswidth; | |
786 | /* | |
787 | * - and that we are working in multiples | |
788 | * of the bus widths | |
789 | */ | |
790 | lli_len -= odd_bytes; | |
791 | ||
792 | } | |
793 | ||
794 | if (lli_len) { | |
795 | /* | |
796 | * Check against minimum bus alignment: | |
797 | * Calculate actual transfer size in relation | |
798 | * to bus width an get a maximum remainder of | |
799 | * the smallest bus width - 1 | |
800 | */ | |
801 | /* FIXME: use round_down()? */ | |
802 | tsize = lli_len / min(mbus->buswidth, | |
803 | sbus->buswidth); | |
804 | lli_len = tsize * min(mbus->buswidth, | |
805 | sbus->buswidth); | |
806 | ||
807 | if (target_len != lli_len) { | |
808 | dev_vdbg(&pl08x->adev->dev, | |
cace6585 | 809 | "%s can't send what we want. Desired 0x%08zx, lli of 0x%08zx bytes in txd of 0x%08zx\n", |
e8689e63 LW |
810 | __func__, target_len, lli_len, txd->len); |
811 | } | |
812 | ||
813 | cctl = pl08x_cctl_bits(cctl, | |
814 | txd->srcbus.buswidth, | |
815 | txd->dstbus.buswidth, | |
816 | tsize); | |
817 | ||
818 | dev_vdbg(&pl08x->adev->dev, | |
cace6585 | 819 | "%s fill lli with single lli chunk of size 0x%08zx (remainder 0x%08zx)\n", |
e8689e63 LW |
820 | __func__, lli_len, remainder); |
821 | num_llis = pl08x_fill_lli_for_desc(pl08x, txd, | |
822 | num_llis, lli_len, cctl, | |
823 | &remainder); | |
824 | total_bytes += lli_len; | |
825 | } | |
826 | ||
827 | ||
828 | if (odd_bytes) { | |
829 | /* | |
830 | * Creep past the boundary, | |
831 | * maintaining master alignment | |
832 | */ | |
833 | int j; | |
834 | for (j = 0; (j < mbus->buswidth) | |
835 | && (remainder); j++) { | |
836 | cctl = pl08x_cctl_bits(cctl, 1, 1, 1); | |
837 | dev_vdbg(&pl08x->adev->dev, | |
cace6585 | 838 | "%s align with boundary, single byte (remain 0x%08zx)\n", |
e8689e63 LW |
839 | __func__, remainder); |
840 | num_llis = | |
841 | pl08x_fill_lli_for_desc(pl08x, | |
842 | txd, num_llis, 1, | |
843 | cctl, &remainder); | |
844 | total_bytes++; | |
845 | } | |
846 | } | |
847 | } | |
848 | ||
849 | /* | |
850 | * Send any odd bytes | |
851 | */ | |
e8689e63 LW |
852 | while (remainder) { |
853 | cctl = pl08x_cctl_bits(cctl, 1, 1, 1); | |
854 | dev_vdbg(&pl08x->adev->dev, | |
cace6585 | 855 | "%s align with boundary, single odd byte (remain %zu)\n", |
e8689e63 LW |
856 | __func__, remainder); |
857 | num_llis = pl08x_fill_lli_for_desc(pl08x, txd, num_llis, | |
858 | 1, cctl, &remainder); | |
859 | total_bytes++; | |
860 | } | |
861 | } | |
862 | if (total_bytes != txd->len) { | |
863 | dev_err(&pl08x->adev->dev, | |
cace6585 | 864 | "%s size of encoded lli:s don't match total txd, transferred 0x%08zx from size 0x%08zx\n", |
e8689e63 LW |
865 | __func__, total_bytes, txd->len); |
866 | return 0; | |
867 | } | |
868 | ||
869 | if (num_llis >= MAX_NUM_TSFR_LLIS) { | |
870 | dev_err(&pl08x->adev->dev, | |
871 | "%s need to increase MAX_NUM_TSFR_LLIS from 0x%08x\n", | |
872 | __func__, (u32) MAX_NUM_TSFR_LLIS); | |
873 | return 0; | |
874 | } | |
b58b6b5b RKAL |
875 | |
876 | llis_va = txd->llis_va; | |
e8689e63 | 877 | /* |
b58b6b5b | 878 | * The final LLI terminates the LLI. |
e8689e63 | 879 | */ |
bfddfb45 | 880 | llis_va[num_llis - 1].lli = 0; |
b58b6b5b RKAL |
881 | /* |
882 | * The final LLI element shall also fire an interrupt | |
883 | */ | |
884 | llis_va[num_llis - 1].cctl |= PL080_CONTROL_TC_IRQ_EN; | |
e8689e63 | 885 | |
e8689e63 LW |
886 | #ifdef VERBOSE_DEBUG |
887 | { | |
888 | int i; | |
889 | ||
890 | for (i = 0; i < num_llis; i++) { | |
891 | dev_vdbg(&pl08x->adev->dev, | |
9c132992 | 892 | "lli %d @%p: csrc=0x%08x, cdst=0x%08x, cctl=0x%08x, clli=0x%08x\n", |
e8689e63 LW |
893 | i, |
894 | &llis_va[i], | |
895 | llis_va[i].src, | |
896 | llis_va[i].dst, | |
897 | llis_va[i].cctl, | |
bfddfb45 | 898 | llis_va[i].lli |
e8689e63 LW |
899 | ); |
900 | } | |
901 | } | |
902 | #endif | |
903 | ||
904 | return num_llis; | |
905 | } | |
906 | ||
907 | /* You should call this with the struct pl08x lock held */ | |
908 | static void pl08x_free_txd(struct pl08x_driver_data *pl08x, | |
909 | struct pl08x_txd *txd) | |
910 | { | |
e8689e63 | 911 | /* Free the LLI */ |
56b61882 | 912 | dma_pool_free(pl08x->pool, txd->llis_va, txd->llis_bus); |
e8689e63 LW |
913 | |
914 | pl08x->pool_ctr--; | |
915 | ||
916 | kfree(txd); | |
917 | } | |
918 | ||
919 | static void pl08x_free_txd_list(struct pl08x_driver_data *pl08x, | |
920 | struct pl08x_dma_chan *plchan) | |
921 | { | |
922 | struct pl08x_txd *txdi = NULL; | |
923 | struct pl08x_txd *next; | |
924 | ||
925 | if (!list_empty(&plchan->desc_list)) { | |
926 | list_for_each_entry_safe(txdi, | |
927 | next, &plchan->desc_list, node) { | |
928 | list_del(&txdi->node); | |
929 | pl08x_free_txd(pl08x, txdi); | |
930 | } | |
931 | ||
932 | } | |
933 | } | |
934 | ||
935 | /* | |
936 | * The DMA ENGINE API | |
937 | */ | |
938 | static int pl08x_alloc_chan_resources(struct dma_chan *chan) | |
939 | { | |
940 | return 0; | |
941 | } | |
942 | ||
943 | static void pl08x_free_chan_resources(struct dma_chan *chan) | |
944 | { | |
945 | } | |
946 | ||
947 | /* | |
948 | * This should be called with the channel plchan->lock held | |
949 | */ | |
950 | static int prep_phy_channel(struct pl08x_dma_chan *plchan, | |
951 | struct pl08x_txd *txd) | |
952 | { | |
953 | struct pl08x_driver_data *pl08x = plchan->host; | |
954 | struct pl08x_phy_chan *ch; | |
955 | int ret; | |
956 | ||
957 | /* Check if we already have a channel */ | |
958 | if (plchan->phychan) | |
959 | return 0; | |
960 | ||
961 | ch = pl08x_get_phy_channel(pl08x, plchan); | |
962 | if (!ch) { | |
963 | /* No physical channel available, cope with it */ | |
964 | dev_dbg(&pl08x->adev->dev, "no physical channel available for xfer on %s\n", plchan->name); | |
965 | return -EBUSY; | |
966 | } | |
967 | ||
968 | /* | |
969 | * OK we have a physical channel: for memcpy() this is all we | |
970 | * need, but for slaves the physical signals may be muxed! | |
971 | * Can the platform allow us to use this channel? | |
972 | */ | |
973 | if (plchan->slave && | |
974 | ch->signal < 0 && | |
975 | pl08x->pd->get_signal) { | |
976 | ret = pl08x->pd->get_signal(plchan); | |
977 | if (ret < 0) { | |
978 | dev_dbg(&pl08x->adev->dev, | |
979 | "unable to use physical channel %d for transfer on %s due to platform restrictions\n", | |
980 | ch->id, plchan->name); | |
981 | /* Release physical channel & return */ | |
982 | pl08x_put_phy_channel(pl08x, ch); | |
983 | return -EBUSY; | |
984 | } | |
985 | ch->signal = ret; | |
09b3c323 RKAL |
986 | |
987 | /* Assign the flow control signal to this channel */ | |
988 | if (txd->direction == DMA_TO_DEVICE) | |
989 | txd->ccfg |= ch->signal << PL080_CONFIG_DST_SEL_SHIFT; | |
990 | else if (txd->direction == DMA_FROM_DEVICE) | |
991 | txd->ccfg |= ch->signal << PL080_CONFIG_SRC_SEL_SHIFT; | |
e8689e63 LW |
992 | } |
993 | ||
994 | dev_dbg(&pl08x->adev->dev, "allocated physical channel %d and signal %d for xfer on %s\n", | |
995 | ch->id, | |
996 | ch->signal, | |
997 | plchan->name); | |
998 | ||
999 | plchan->phychan = ch; | |
1000 | ||
1001 | return 0; | |
1002 | } | |
1003 | ||
8c8cc2b1 RKAL |
1004 | static void release_phy_channel(struct pl08x_dma_chan *plchan) |
1005 | { | |
1006 | struct pl08x_driver_data *pl08x = plchan->host; | |
1007 | ||
1008 | if ((plchan->phychan->signal >= 0) && pl08x->pd->put_signal) { | |
1009 | pl08x->pd->put_signal(plchan); | |
1010 | plchan->phychan->signal = -1; | |
1011 | } | |
1012 | pl08x_put_phy_channel(pl08x, plchan->phychan); | |
1013 | plchan->phychan = NULL; | |
1014 | } | |
1015 | ||
e8689e63 LW |
1016 | static dma_cookie_t pl08x_tx_submit(struct dma_async_tx_descriptor *tx) |
1017 | { | |
1018 | struct pl08x_dma_chan *plchan = to_pl08x_chan(tx->chan); | |
1019 | ||
91aa5fad RKAL |
1020 | plchan->chan.cookie += 1; |
1021 | if (plchan->chan.cookie < 0) | |
1022 | plchan->chan.cookie = 1; | |
1023 | tx->cookie = plchan->chan.cookie; | |
e8689e63 LW |
1024 | /* This unlock follows the lock in the prep() function */ |
1025 | spin_unlock_irqrestore(&plchan->lock, plchan->lockflags); | |
1026 | ||
1027 | return tx->cookie; | |
1028 | } | |
1029 | ||
1030 | static struct dma_async_tx_descriptor *pl08x_prep_dma_interrupt( | |
1031 | struct dma_chan *chan, unsigned long flags) | |
1032 | { | |
1033 | struct dma_async_tx_descriptor *retval = NULL; | |
1034 | ||
1035 | return retval; | |
1036 | } | |
1037 | ||
1038 | /* | |
1039 | * Code accessing dma_async_is_complete() in a tight loop | |
1040 | * may give problems - could schedule where indicated. | |
1041 | * If slaves are relying on interrupts to signal completion this | |
1042 | * function must not be called with interrupts disabled | |
1043 | */ | |
1044 | static enum dma_status | |
1045 | pl08x_dma_tx_status(struct dma_chan *chan, | |
1046 | dma_cookie_t cookie, | |
1047 | struct dma_tx_state *txstate) | |
1048 | { | |
1049 | struct pl08x_dma_chan *plchan = to_pl08x_chan(chan); | |
1050 | dma_cookie_t last_used; | |
1051 | dma_cookie_t last_complete; | |
1052 | enum dma_status ret; | |
1053 | u32 bytesleft = 0; | |
1054 | ||
91aa5fad | 1055 | last_used = plchan->chan.cookie; |
e8689e63 LW |
1056 | last_complete = plchan->lc; |
1057 | ||
1058 | ret = dma_async_is_complete(cookie, last_complete, last_used); | |
1059 | if (ret == DMA_SUCCESS) { | |
1060 | dma_set_tx_state(txstate, last_complete, last_used, 0); | |
1061 | return ret; | |
1062 | } | |
1063 | ||
1064 | /* | |
1065 | * schedule(); could be inserted here | |
1066 | */ | |
1067 | ||
1068 | /* | |
1069 | * This cookie not complete yet | |
1070 | */ | |
91aa5fad | 1071 | last_used = plchan->chan.cookie; |
e8689e63 LW |
1072 | last_complete = plchan->lc; |
1073 | ||
1074 | /* Get number of bytes left in the active transactions and queue */ | |
1075 | bytesleft = pl08x_getbytes_chan(plchan); | |
1076 | ||
1077 | dma_set_tx_state(txstate, last_complete, last_used, | |
1078 | bytesleft); | |
1079 | ||
1080 | if (plchan->state == PL08X_CHAN_PAUSED) | |
1081 | return DMA_PAUSED; | |
1082 | ||
1083 | /* Whether waiting or running, we're in progress */ | |
1084 | return DMA_IN_PROGRESS; | |
1085 | } | |
1086 | ||
1087 | /* PrimeCell DMA extension */ | |
1088 | struct burst_table { | |
1089 | int burstwords; | |
1090 | u32 reg; | |
1091 | }; | |
1092 | ||
1093 | static const struct burst_table burst_sizes[] = { | |
1094 | { | |
1095 | .burstwords = 256, | |
1096 | .reg = (PL080_BSIZE_256 << PL080_CONTROL_SB_SIZE_SHIFT) | | |
1097 | (PL080_BSIZE_256 << PL080_CONTROL_DB_SIZE_SHIFT), | |
1098 | }, | |
1099 | { | |
1100 | .burstwords = 128, | |
1101 | .reg = (PL080_BSIZE_128 << PL080_CONTROL_SB_SIZE_SHIFT) | | |
1102 | (PL080_BSIZE_128 << PL080_CONTROL_DB_SIZE_SHIFT), | |
1103 | }, | |
1104 | { | |
1105 | .burstwords = 64, | |
1106 | .reg = (PL080_BSIZE_64 << PL080_CONTROL_SB_SIZE_SHIFT) | | |
1107 | (PL080_BSIZE_64 << PL080_CONTROL_DB_SIZE_SHIFT), | |
1108 | }, | |
1109 | { | |
1110 | .burstwords = 32, | |
1111 | .reg = (PL080_BSIZE_32 << PL080_CONTROL_SB_SIZE_SHIFT) | | |
1112 | (PL080_BSIZE_32 << PL080_CONTROL_DB_SIZE_SHIFT), | |
1113 | }, | |
1114 | { | |
1115 | .burstwords = 16, | |
1116 | .reg = (PL080_BSIZE_16 << PL080_CONTROL_SB_SIZE_SHIFT) | | |
1117 | (PL080_BSIZE_16 << PL080_CONTROL_DB_SIZE_SHIFT), | |
1118 | }, | |
1119 | { | |
1120 | .burstwords = 8, | |
1121 | .reg = (PL080_BSIZE_8 << PL080_CONTROL_SB_SIZE_SHIFT) | | |
1122 | (PL080_BSIZE_8 << PL080_CONTROL_DB_SIZE_SHIFT), | |
1123 | }, | |
1124 | { | |
1125 | .burstwords = 4, | |
1126 | .reg = (PL080_BSIZE_4 << PL080_CONTROL_SB_SIZE_SHIFT) | | |
1127 | (PL080_BSIZE_4 << PL080_CONTROL_DB_SIZE_SHIFT), | |
1128 | }, | |
1129 | { | |
1130 | .burstwords = 1, | |
1131 | .reg = (PL080_BSIZE_1 << PL080_CONTROL_SB_SIZE_SHIFT) | | |
1132 | (PL080_BSIZE_1 << PL080_CONTROL_DB_SIZE_SHIFT), | |
1133 | }, | |
1134 | }; | |
1135 | ||
1136 | static void dma_set_runtime_config(struct dma_chan *chan, | |
1137 | struct dma_slave_config *config) | |
1138 | { | |
1139 | struct pl08x_dma_chan *plchan = to_pl08x_chan(chan); | |
1140 | struct pl08x_driver_data *pl08x = plchan->host; | |
1141 | struct pl08x_channel_data *cd = plchan->cd; | |
1142 | enum dma_slave_buswidth addr_width; | |
1143 | u32 maxburst; | |
1144 | u32 cctl = 0; | |
4440aacf | 1145 | int i; |
e8689e63 LW |
1146 | |
1147 | /* Transfer direction */ | |
1148 | plchan->runtime_direction = config->direction; | |
1149 | if (config->direction == DMA_TO_DEVICE) { | |
1150 | plchan->runtime_addr = config->dst_addr; | |
e8689e63 LW |
1151 | addr_width = config->dst_addr_width; |
1152 | maxburst = config->dst_maxburst; | |
1153 | } else if (config->direction == DMA_FROM_DEVICE) { | |
1154 | plchan->runtime_addr = config->src_addr; | |
e8689e63 LW |
1155 | addr_width = config->src_addr_width; |
1156 | maxburst = config->src_maxburst; | |
1157 | } else { | |
1158 | dev_err(&pl08x->adev->dev, | |
1159 | "bad runtime_config: alien transfer direction\n"); | |
1160 | return; | |
1161 | } | |
1162 | ||
1163 | switch (addr_width) { | |
1164 | case DMA_SLAVE_BUSWIDTH_1_BYTE: | |
1165 | cctl |= (PL080_WIDTH_8BIT << PL080_CONTROL_SWIDTH_SHIFT) | | |
1166 | (PL080_WIDTH_8BIT << PL080_CONTROL_DWIDTH_SHIFT); | |
1167 | break; | |
1168 | case DMA_SLAVE_BUSWIDTH_2_BYTES: | |
1169 | cctl |= (PL080_WIDTH_16BIT << PL080_CONTROL_SWIDTH_SHIFT) | | |
1170 | (PL080_WIDTH_16BIT << PL080_CONTROL_DWIDTH_SHIFT); | |
1171 | break; | |
1172 | case DMA_SLAVE_BUSWIDTH_4_BYTES: | |
1173 | cctl |= (PL080_WIDTH_32BIT << PL080_CONTROL_SWIDTH_SHIFT) | | |
1174 | (PL080_WIDTH_32BIT << PL080_CONTROL_DWIDTH_SHIFT); | |
1175 | break; | |
1176 | default: | |
1177 | dev_err(&pl08x->adev->dev, | |
1178 | "bad runtime_config: alien address width\n"); | |
1179 | return; | |
1180 | } | |
1181 | ||
1182 | /* | |
1183 | * Now decide on a maxburst: | |
4440aacf RKAL |
1184 | * If this channel will only request single transfers, set this |
1185 | * down to ONE element. Also select one element if no maxburst | |
1186 | * is specified. | |
e8689e63 | 1187 | */ |
4440aacf | 1188 | if (plchan->cd->single || maxburst == 0) { |
e8689e63 LW |
1189 | cctl |= (PL080_BSIZE_1 << PL080_CONTROL_SB_SIZE_SHIFT) | |
1190 | (PL080_BSIZE_1 << PL080_CONTROL_DB_SIZE_SHIFT); | |
1191 | } else { | |
4440aacf | 1192 | for (i = 0; i < ARRAY_SIZE(burst_sizes); i++) |
e8689e63 LW |
1193 | if (burst_sizes[i].burstwords <= maxburst) |
1194 | break; | |
e8689e63 LW |
1195 | cctl |= burst_sizes[i].reg; |
1196 | } | |
1197 | ||
e8689e63 LW |
1198 | /* Modify the default channel data to fit PrimeCell request */ |
1199 | cd->cctl = cctl; | |
e8689e63 LW |
1200 | |
1201 | dev_dbg(&pl08x->adev->dev, | |
1202 | "configured channel %s (%s) for %s, data width %d, " | |
4983a04f | 1203 | "maxburst %d words, LE, CCTL=0x%08x\n", |
e8689e63 LW |
1204 | dma_chan_name(chan), plchan->name, |
1205 | (config->direction == DMA_FROM_DEVICE) ? "RX" : "TX", | |
1206 | addr_width, | |
1207 | maxburst, | |
4983a04f | 1208 | cctl); |
e8689e63 LW |
1209 | } |
1210 | ||
1211 | /* | |
1212 | * Slave transactions callback to the slave device to allow | |
1213 | * synchronization of slave DMA signals with the DMAC enable | |
1214 | */ | |
1215 | static void pl08x_issue_pending(struct dma_chan *chan) | |
1216 | { | |
1217 | struct pl08x_dma_chan *plchan = to_pl08x_chan(chan); | |
e8689e63 LW |
1218 | unsigned long flags; |
1219 | ||
1220 | spin_lock_irqsave(&plchan->lock, flags); | |
9c0bb43b RKAL |
1221 | /* Something is already active, or we're waiting for a channel... */ |
1222 | if (plchan->at || plchan->state == PL08X_CHAN_WAITING) { | |
1223 | spin_unlock_irqrestore(&plchan->lock, flags); | |
e8689e63 | 1224 | return; |
9c0bb43b | 1225 | } |
e8689e63 LW |
1226 | |
1227 | /* Take the first element in the queue and execute it */ | |
1228 | if (!list_empty(&plchan->desc_list)) { | |
1229 | struct pl08x_txd *next; | |
1230 | ||
1231 | next = list_first_entry(&plchan->desc_list, | |
1232 | struct pl08x_txd, | |
1233 | node); | |
1234 | list_del(&next->node); | |
e8689e63 LW |
1235 | plchan->state = PL08X_CHAN_RUNNING; |
1236 | ||
c885bee4 | 1237 | pl08x_start_txd(plchan, next); |
e8689e63 LW |
1238 | } |
1239 | ||
1240 | spin_unlock_irqrestore(&plchan->lock, flags); | |
1241 | } | |
1242 | ||
1243 | static int pl08x_prep_channel_resources(struct pl08x_dma_chan *plchan, | |
1244 | struct pl08x_txd *txd) | |
1245 | { | |
1246 | int num_llis; | |
1247 | struct pl08x_driver_data *pl08x = plchan->host; | |
1248 | int ret; | |
1249 | ||
1250 | num_llis = pl08x_fill_llis_for_desc(pl08x, txd); | |
dafa7317 RKAL |
1251 | if (!num_llis) { |
1252 | kfree(txd); | |
e8689e63 | 1253 | return -EINVAL; |
dafa7317 | 1254 | } |
e8689e63 LW |
1255 | |
1256 | spin_lock_irqsave(&plchan->lock, plchan->lockflags); | |
1257 | ||
b58b6b5b | 1258 | list_add_tail(&txd->node, &plchan->desc_list); |
e8689e63 LW |
1259 | |
1260 | /* | |
1261 | * See if we already have a physical channel allocated, | |
1262 | * else this is the time to try to get one. | |
1263 | */ | |
1264 | ret = prep_phy_channel(plchan, txd); | |
1265 | if (ret) { | |
1266 | /* | |
1267 | * No physical channel available, we will | |
1268 | * stack up the memcpy channels until there is a channel | |
1269 | * available to handle it whereas slave transfers may | |
1270 | * have been denied due to platform channel muxing restrictions | |
1271 | * and since there is no guarantee that this will ever be | |
e8b5e11d RKAL |
1272 | * resolved, and since the signal must be acquired AFTER |
1273 | * acquiring the physical channel, we will let them be NACK:ed | |
e8689e63 LW |
1274 | * with -EBUSY here. The drivers can alway retry the prep() |
1275 | * call if they are eager on doing this using DMA. | |
1276 | */ | |
1277 | if (plchan->slave) { | |
1278 | pl08x_free_txd_list(pl08x, plchan); | |
1279 | spin_unlock_irqrestore(&plchan->lock, plchan->lockflags); | |
1280 | return -EBUSY; | |
1281 | } | |
1282 | /* Do this memcpy whenever there is a channel ready */ | |
1283 | plchan->state = PL08X_CHAN_WAITING; | |
1284 | plchan->waiting = txd; | |
1285 | } else | |
1286 | /* | |
1287 | * Else we're all set, paused and ready to roll, | |
1288 | * status will switch to PL08X_CHAN_RUNNING when | |
1289 | * we call issue_pending(). If there is something | |
1290 | * running on the channel already we don't change | |
1291 | * its state. | |
1292 | */ | |
1293 | if (plchan->state == PL08X_CHAN_IDLE) | |
1294 | plchan->state = PL08X_CHAN_PAUSED; | |
1295 | ||
1296 | /* | |
1297 | * Notice that we leave plchan->lock locked on purpose: | |
1298 | * it will be unlocked in the subsequent tx_submit() | |
1299 | * call. This is a consequence of the current API. | |
1300 | */ | |
1301 | ||
1302 | return 0; | |
1303 | } | |
1304 | ||
ac3cd20d RKAL |
1305 | static struct pl08x_txd *pl08x_get_txd(struct pl08x_dma_chan *plchan) |
1306 | { | |
1307 | struct pl08x_txd *txd = kzalloc(sizeof(struct pl08x_txd), GFP_NOWAIT); | |
1308 | ||
1309 | if (txd) { | |
1310 | dma_async_tx_descriptor_init(&txd->tx, &plchan->chan); | |
1311 | txd->tx.tx_submit = pl08x_tx_submit; | |
1312 | INIT_LIST_HEAD(&txd->node); | |
4983a04f RKAL |
1313 | |
1314 | /* Always enable error and terminal interrupts */ | |
1315 | txd->ccfg = PL080_CONFIG_ERR_IRQ_MASK | | |
1316 | PL080_CONFIG_TC_IRQ_MASK; | |
ac3cd20d RKAL |
1317 | } |
1318 | return txd; | |
1319 | } | |
1320 | ||
e8689e63 LW |
1321 | /* |
1322 | * Initialize a descriptor to be used by memcpy submit | |
1323 | */ | |
1324 | static struct dma_async_tx_descriptor *pl08x_prep_dma_memcpy( | |
1325 | struct dma_chan *chan, dma_addr_t dest, dma_addr_t src, | |
1326 | size_t len, unsigned long flags) | |
1327 | { | |
1328 | struct pl08x_dma_chan *plchan = to_pl08x_chan(chan); | |
1329 | struct pl08x_driver_data *pl08x = plchan->host; | |
1330 | struct pl08x_txd *txd; | |
1331 | int ret; | |
1332 | ||
ac3cd20d | 1333 | txd = pl08x_get_txd(plchan); |
e8689e63 LW |
1334 | if (!txd) { |
1335 | dev_err(&pl08x->adev->dev, | |
1336 | "%s no memory for descriptor\n", __func__); | |
1337 | return NULL; | |
1338 | } | |
1339 | ||
e8689e63 LW |
1340 | txd->direction = DMA_NONE; |
1341 | txd->srcbus.addr = src; | |
1342 | txd->dstbus.addr = dest; | |
1343 | ||
1344 | /* Set platform data for m2m */ | |
4983a04f | 1345 | txd->ccfg |= PL080_FLOW_MEM2MEM << PL080_CONFIG_FLOW_CONTROL_SHIFT; |
70b5ed6b | 1346 | txd->cctl = pl08x->pd->memcpy_channel.cctl; |
4983a04f | 1347 | |
e8689e63 | 1348 | /* Both to be incremented or the code will break */ |
70b5ed6b | 1349 | txd->cctl |= PL080_CONTROL_SRC_INCR | PL080_CONTROL_DST_INCR; |
e8689e63 LW |
1350 | txd->len = len; |
1351 | ||
e8689e63 LW |
1352 | ret = pl08x_prep_channel_resources(plchan, txd); |
1353 | if (ret) | |
1354 | return NULL; | |
1355 | /* | |
1356 | * NB: the channel lock is held at this point so tx_submit() | |
1357 | * must be called in direct succession. | |
1358 | */ | |
1359 | ||
1360 | return &txd->tx; | |
1361 | } | |
1362 | ||
3e2a037c | 1363 | static struct dma_async_tx_descriptor *pl08x_prep_slave_sg( |
e8689e63 LW |
1364 | struct dma_chan *chan, struct scatterlist *sgl, |
1365 | unsigned int sg_len, enum dma_data_direction direction, | |
1366 | unsigned long flags) | |
1367 | { | |
1368 | struct pl08x_dma_chan *plchan = to_pl08x_chan(chan); | |
1369 | struct pl08x_driver_data *pl08x = plchan->host; | |
1370 | struct pl08x_txd *txd; | |
1371 | int ret; | |
1372 | ||
1373 | /* | |
1374 | * Current implementation ASSUMES only one sg | |
1375 | */ | |
1376 | if (sg_len != 1) { | |
1377 | dev_err(&pl08x->adev->dev, "%s prepared too long sglist\n", | |
1378 | __func__); | |
1379 | BUG(); | |
1380 | } | |
1381 | ||
1382 | dev_dbg(&pl08x->adev->dev, "%s prepare transaction of %d bytes from %s\n", | |
1383 | __func__, sgl->length, plchan->name); | |
1384 | ||
ac3cd20d | 1385 | txd = pl08x_get_txd(plchan); |
e8689e63 LW |
1386 | if (!txd) { |
1387 | dev_err(&pl08x->adev->dev, "%s no txd\n", __func__); | |
1388 | return NULL; | |
1389 | } | |
1390 | ||
e8689e63 LW |
1391 | if (direction != plchan->runtime_direction) |
1392 | dev_err(&pl08x->adev->dev, "%s DMA setup does not match " | |
1393 | "the direction configured for the PrimeCell\n", | |
1394 | __func__); | |
1395 | ||
1396 | /* | |
1397 | * Set up addresses, the PrimeCell configured address | |
1398 | * will take precedence since this may configure the | |
1399 | * channel target address dynamically at runtime. | |
1400 | */ | |
1401 | txd->direction = direction; | |
1cae78f1 RKAL |
1402 | txd->cctl = plchan->cd->cctl & |
1403 | ~(PL080_CONTROL_SRC_INCR | PL080_CONTROL_DST_INCR | | |
1404 | PL080_CONTROL_PROT_MASK); | |
1405 | ||
1406 | /* Access the cell in privileged mode, non-bufferable, non-cacheable */ | |
1407 | txd->cctl |= PL080_CONTROL_PROT_SYS; | |
70b5ed6b | 1408 | |
e8689e63 | 1409 | if (direction == DMA_TO_DEVICE) { |
4983a04f | 1410 | txd->ccfg |= PL080_FLOW_MEM2PER << PL080_CONFIG_FLOW_CONTROL_SHIFT; |
1cae78f1 | 1411 | txd->cctl |= PL080_CONTROL_SRC_INCR; |
e8689e63 LW |
1412 | txd->srcbus.addr = sgl->dma_address; |
1413 | if (plchan->runtime_addr) | |
1414 | txd->dstbus.addr = plchan->runtime_addr; | |
1415 | else | |
1416 | txd->dstbus.addr = plchan->cd->addr; | |
1417 | } else if (direction == DMA_FROM_DEVICE) { | |
4983a04f | 1418 | txd->ccfg |= PL080_FLOW_PER2MEM << PL080_CONFIG_FLOW_CONTROL_SHIFT; |
1cae78f1 | 1419 | txd->cctl |= PL080_CONTROL_DST_INCR; |
e8689e63 LW |
1420 | if (plchan->runtime_addr) |
1421 | txd->srcbus.addr = plchan->runtime_addr; | |
1422 | else | |
1423 | txd->srcbus.addr = plchan->cd->addr; | |
1424 | txd->dstbus.addr = sgl->dma_address; | |
1425 | } else { | |
1426 | dev_err(&pl08x->adev->dev, | |
1427 | "%s direction unsupported\n", __func__); | |
1428 | return NULL; | |
1429 | } | |
e8689e63 | 1430 | txd->len = sgl->length; |
e8689e63 LW |
1431 | |
1432 | ret = pl08x_prep_channel_resources(plchan, txd); | |
1433 | if (ret) | |
1434 | return NULL; | |
1435 | /* | |
1436 | * NB: the channel lock is held at this point so tx_submit() | |
1437 | * must be called in direct succession. | |
1438 | */ | |
1439 | ||
1440 | return &txd->tx; | |
1441 | } | |
1442 | ||
1443 | static int pl08x_control(struct dma_chan *chan, enum dma_ctrl_cmd cmd, | |
1444 | unsigned long arg) | |
1445 | { | |
1446 | struct pl08x_dma_chan *plchan = to_pl08x_chan(chan); | |
1447 | struct pl08x_driver_data *pl08x = plchan->host; | |
1448 | unsigned long flags; | |
1449 | int ret = 0; | |
1450 | ||
1451 | /* Controls applicable to inactive channels */ | |
1452 | if (cmd == DMA_SLAVE_CONFIG) { | |
1453 | dma_set_runtime_config(chan, | |
1454 | (struct dma_slave_config *) | |
1455 | arg); | |
1456 | return 0; | |
1457 | } | |
1458 | ||
1459 | /* | |
1460 | * Anything succeeds on channels with no physical allocation and | |
1461 | * no queued transfers. | |
1462 | */ | |
1463 | spin_lock_irqsave(&plchan->lock, flags); | |
1464 | if (!plchan->phychan && !plchan->at) { | |
1465 | spin_unlock_irqrestore(&plchan->lock, flags); | |
1466 | return 0; | |
1467 | } | |
1468 | ||
1469 | switch (cmd) { | |
1470 | case DMA_TERMINATE_ALL: | |
1471 | plchan->state = PL08X_CHAN_IDLE; | |
1472 | ||
1473 | if (plchan->phychan) { | |
1474 | pl08x_stop_phy_chan(plchan->phychan); | |
1475 | ||
1476 | /* | |
1477 | * Mark physical channel as free and free any slave | |
1478 | * signal | |
1479 | */ | |
8c8cc2b1 | 1480 | release_phy_channel(plchan); |
e8689e63 | 1481 | } |
e8689e63 LW |
1482 | /* Dequeue jobs and free LLIs */ |
1483 | if (plchan->at) { | |
1484 | pl08x_free_txd(pl08x, plchan->at); | |
1485 | plchan->at = NULL; | |
1486 | } | |
1487 | /* Dequeue jobs not yet fired as well */ | |
1488 | pl08x_free_txd_list(pl08x, plchan); | |
1489 | break; | |
1490 | case DMA_PAUSE: | |
1491 | pl08x_pause_phy_chan(plchan->phychan); | |
1492 | plchan->state = PL08X_CHAN_PAUSED; | |
1493 | break; | |
1494 | case DMA_RESUME: | |
1495 | pl08x_resume_phy_chan(plchan->phychan); | |
1496 | plchan->state = PL08X_CHAN_RUNNING; | |
1497 | break; | |
1498 | default: | |
1499 | /* Unknown command */ | |
1500 | ret = -ENXIO; | |
1501 | break; | |
1502 | } | |
1503 | ||
1504 | spin_unlock_irqrestore(&plchan->lock, flags); | |
1505 | ||
1506 | return ret; | |
1507 | } | |
1508 | ||
1509 | bool pl08x_filter_id(struct dma_chan *chan, void *chan_id) | |
1510 | { | |
1511 | struct pl08x_dma_chan *plchan = to_pl08x_chan(chan); | |
1512 | char *name = chan_id; | |
1513 | ||
1514 | /* Check that the channel is not taken! */ | |
1515 | if (!strcmp(plchan->name, name)) | |
1516 | return true; | |
1517 | ||
1518 | return false; | |
1519 | } | |
1520 | ||
1521 | /* | |
1522 | * Just check that the device is there and active | |
1523 | * TODO: turn this bit on/off depending on the number of | |
1524 | * physical channels actually used, if it is zero... well | |
1525 | * shut it off. That will save some power. Cut the clock | |
1526 | * at the same time. | |
1527 | */ | |
1528 | static void pl08x_ensure_on(struct pl08x_driver_data *pl08x) | |
1529 | { | |
1530 | u32 val; | |
1531 | ||
1532 | val = readl(pl08x->base + PL080_CONFIG); | |
1533 | val &= ~(PL080_CONFIG_M2_BE | PL080_CONFIG_M1_BE | PL080_CONFIG_ENABLE); | |
e8b5e11d | 1534 | /* We implicitly clear bit 1 and that means little-endian mode */ |
e8689e63 LW |
1535 | val |= PL080_CONFIG_ENABLE; |
1536 | writel(val, pl08x->base + PL080_CONFIG); | |
1537 | } | |
1538 | ||
1539 | static void pl08x_tasklet(unsigned long data) | |
1540 | { | |
1541 | struct pl08x_dma_chan *plchan = (struct pl08x_dma_chan *) data; | |
e8689e63 | 1542 | struct pl08x_driver_data *pl08x = plchan->host; |
bf072af4 | 1543 | unsigned long flags; |
e8689e63 | 1544 | |
bf072af4 | 1545 | spin_lock_irqsave(&plchan->lock, flags); |
e8689e63 LW |
1546 | |
1547 | if (plchan->at) { | |
1548 | dma_async_tx_callback callback = | |
1549 | plchan->at->tx.callback; | |
1550 | void *callback_param = | |
1551 | plchan->at->tx.callback_param; | |
1552 | ||
1553 | /* | |
1554 | * Update last completed | |
1555 | */ | |
91aa5fad | 1556 | plchan->lc = plchan->at->tx.cookie; |
e8689e63 LW |
1557 | |
1558 | /* | |
1559 | * Callback to signal completion | |
1560 | */ | |
1561 | if (callback) | |
1562 | callback(callback_param); | |
1563 | ||
e8689e63 | 1564 | /* |
b58b6b5b | 1565 | * Free the descriptor |
e8689e63 | 1566 | */ |
b58b6b5b RKAL |
1567 | pl08x_free_txd(pl08x, plchan->at); |
1568 | plchan->at = NULL; | |
e8689e63 LW |
1569 | } |
1570 | /* | |
1571 | * If a new descriptor is queued, set it up | |
1572 | * plchan->at is NULL here | |
1573 | */ | |
1574 | if (!list_empty(&plchan->desc_list)) { | |
1575 | struct pl08x_txd *next; | |
1576 | ||
1577 | next = list_first_entry(&plchan->desc_list, | |
1578 | struct pl08x_txd, | |
1579 | node); | |
1580 | list_del(&next->node); | |
c885bee4 RKAL |
1581 | |
1582 | pl08x_start_txd(plchan, next); | |
e8689e63 LW |
1583 | } else { |
1584 | struct pl08x_dma_chan *waiting = NULL; | |
1585 | ||
1586 | /* | |
1587 | * No more jobs, so free up the physical channel | |
1588 | * Free any allocated signal on slave transfers too | |
1589 | */ | |
8c8cc2b1 | 1590 | release_phy_channel(plchan); |
e8689e63 LW |
1591 | plchan->state = PL08X_CHAN_IDLE; |
1592 | ||
1593 | /* | |
1594 | * And NOW before anyone else can grab that free:d | |
1595 | * up physical channel, see if there is some memcpy | |
1596 | * pending that seriously needs to start because of | |
1597 | * being stacked up while we were choking the | |
1598 | * physical channels with data. | |
1599 | */ | |
1600 | list_for_each_entry(waiting, &pl08x->memcpy.channels, | |
1601 | chan.device_node) { | |
1602 | if (waiting->state == PL08X_CHAN_WAITING && | |
1603 | waiting->waiting != NULL) { | |
1604 | int ret; | |
1605 | ||
1606 | /* This should REALLY not fail now */ | |
1607 | ret = prep_phy_channel(waiting, | |
1608 | waiting->waiting); | |
1609 | BUG_ON(ret); | |
1610 | waiting->state = PL08X_CHAN_RUNNING; | |
1611 | waiting->waiting = NULL; | |
1612 | pl08x_issue_pending(&waiting->chan); | |
1613 | break; | |
1614 | } | |
1615 | } | |
1616 | } | |
1617 | ||
bf072af4 | 1618 | spin_unlock_irqrestore(&plchan->lock, flags); |
e8689e63 LW |
1619 | } |
1620 | ||
1621 | static irqreturn_t pl08x_irq(int irq, void *dev) | |
1622 | { | |
1623 | struct pl08x_driver_data *pl08x = dev; | |
1624 | u32 mask = 0; | |
1625 | u32 val; | |
1626 | int i; | |
1627 | ||
1628 | val = readl(pl08x->base + PL080_ERR_STATUS); | |
1629 | if (val) { | |
1630 | /* | |
1631 | * An error interrupt (on one or more channels) | |
1632 | */ | |
1633 | dev_err(&pl08x->adev->dev, | |
1634 | "%s error interrupt, register value 0x%08x\n", | |
1635 | __func__, val); | |
1636 | /* | |
1637 | * Simply clear ALL PL08X error interrupts, | |
1638 | * regardless of channel and cause | |
1639 | * FIXME: should be 0x00000003 on PL081 really. | |
1640 | */ | |
1641 | writel(0x000000FF, pl08x->base + PL080_ERR_CLEAR); | |
1642 | } | |
1643 | val = readl(pl08x->base + PL080_INT_STATUS); | |
1644 | for (i = 0; i < pl08x->vd->channels; i++) { | |
1645 | if ((1 << i) & val) { | |
1646 | /* Locate physical channel */ | |
1647 | struct pl08x_phy_chan *phychan = &pl08x->phy_chans[i]; | |
1648 | struct pl08x_dma_chan *plchan = phychan->serving; | |
1649 | ||
1650 | /* Schedule tasklet on this channel */ | |
1651 | tasklet_schedule(&plchan->tasklet); | |
1652 | ||
1653 | mask |= (1 << i); | |
1654 | } | |
1655 | } | |
1656 | /* | |
1657 | * Clear only the terminal interrupts on channels we processed | |
1658 | */ | |
1659 | writel(mask, pl08x->base + PL080_TC_CLEAR); | |
1660 | ||
1661 | return mask ? IRQ_HANDLED : IRQ_NONE; | |
1662 | } | |
1663 | ||
1664 | /* | |
1665 | * Initialise the DMAC memcpy/slave channels. | |
1666 | * Make a local wrapper to hold required data | |
1667 | */ | |
1668 | static int pl08x_dma_init_virtual_channels(struct pl08x_driver_data *pl08x, | |
1669 | struct dma_device *dmadev, | |
1670 | unsigned int channels, | |
1671 | bool slave) | |
1672 | { | |
1673 | struct pl08x_dma_chan *chan; | |
1674 | int i; | |
1675 | ||
1676 | INIT_LIST_HEAD(&dmadev->channels); | |
1677 | /* | |
1678 | * Register as many many memcpy as we have physical channels, | |
1679 | * we won't always be able to use all but the code will have | |
1680 | * to cope with that situation. | |
1681 | */ | |
1682 | for (i = 0; i < channels; i++) { | |
1683 | chan = kzalloc(sizeof(struct pl08x_dma_chan), GFP_KERNEL); | |
1684 | if (!chan) { | |
1685 | dev_err(&pl08x->adev->dev, | |
1686 | "%s no memory for channel\n", __func__); | |
1687 | return -ENOMEM; | |
1688 | } | |
1689 | ||
1690 | chan->host = pl08x; | |
1691 | chan->state = PL08X_CHAN_IDLE; | |
1692 | ||
1693 | if (slave) { | |
1694 | chan->slave = true; | |
1695 | chan->name = pl08x->pd->slave_channels[i].bus_id; | |
1696 | chan->cd = &pl08x->pd->slave_channels[i]; | |
1697 | } else { | |
1698 | chan->cd = &pl08x->pd->memcpy_channel; | |
1699 | chan->name = kasprintf(GFP_KERNEL, "memcpy%d", i); | |
1700 | if (!chan->name) { | |
1701 | kfree(chan); | |
1702 | return -ENOMEM; | |
1703 | } | |
1704 | } | |
b58b6b5b RKAL |
1705 | if (chan->cd->circular_buffer) { |
1706 | dev_err(&pl08x->adev->dev, | |
1707 | "channel %s: circular buffers not supported\n", | |
1708 | chan->name); | |
1709 | kfree(chan); | |
1710 | continue; | |
1711 | } | |
e8689e63 LW |
1712 | dev_info(&pl08x->adev->dev, |
1713 | "initialize virtual channel \"%s\"\n", | |
1714 | chan->name); | |
1715 | ||
1716 | chan->chan.device = dmadev; | |
91aa5fad RKAL |
1717 | chan->chan.cookie = 0; |
1718 | chan->lc = 0; | |
e8689e63 LW |
1719 | |
1720 | spin_lock_init(&chan->lock); | |
1721 | INIT_LIST_HEAD(&chan->desc_list); | |
1722 | tasklet_init(&chan->tasklet, pl08x_tasklet, | |
1723 | (unsigned long) chan); | |
1724 | ||
1725 | list_add_tail(&chan->chan.device_node, &dmadev->channels); | |
1726 | } | |
1727 | dev_info(&pl08x->adev->dev, "initialized %d virtual %s channels\n", | |
1728 | i, slave ? "slave" : "memcpy"); | |
1729 | return i; | |
1730 | } | |
1731 | ||
1732 | static void pl08x_free_virtual_channels(struct dma_device *dmadev) | |
1733 | { | |
1734 | struct pl08x_dma_chan *chan = NULL; | |
1735 | struct pl08x_dma_chan *next; | |
1736 | ||
1737 | list_for_each_entry_safe(chan, | |
1738 | next, &dmadev->channels, chan.device_node) { | |
1739 | list_del(&chan->chan.device_node); | |
1740 | kfree(chan); | |
1741 | } | |
1742 | } | |
1743 | ||
1744 | #ifdef CONFIG_DEBUG_FS | |
1745 | static const char *pl08x_state_str(enum pl08x_dma_chan_state state) | |
1746 | { | |
1747 | switch (state) { | |
1748 | case PL08X_CHAN_IDLE: | |
1749 | return "idle"; | |
1750 | case PL08X_CHAN_RUNNING: | |
1751 | return "running"; | |
1752 | case PL08X_CHAN_PAUSED: | |
1753 | return "paused"; | |
1754 | case PL08X_CHAN_WAITING: | |
1755 | return "waiting"; | |
1756 | default: | |
1757 | break; | |
1758 | } | |
1759 | return "UNKNOWN STATE"; | |
1760 | } | |
1761 | ||
1762 | static int pl08x_debugfs_show(struct seq_file *s, void *data) | |
1763 | { | |
1764 | struct pl08x_driver_data *pl08x = s->private; | |
1765 | struct pl08x_dma_chan *chan; | |
1766 | struct pl08x_phy_chan *ch; | |
1767 | unsigned long flags; | |
1768 | int i; | |
1769 | ||
1770 | seq_printf(s, "PL08x physical channels:\n"); | |
1771 | seq_printf(s, "CHANNEL:\tUSER:\n"); | |
1772 | seq_printf(s, "--------\t-----\n"); | |
1773 | for (i = 0; i < pl08x->vd->channels; i++) { | |
1774 | struct pl08x_dma_chan *virt_chan; | |
1775 | ||
1776 | ch = &pl08x->phy_chans[i]; | |
1777 | ||
1778 | spin_lock_irqsave(&ch->lock, flags); | |
1779 | virt_chan = ch->serving; | |
1780 | ||
1781 | seq_printf(s, "%d\t\t%s\n", | |
1782 | ch->id, virt_chan ? virt_chan->name : "(none)"); | |
1783 | ||
1784 | spin_unlock_irqrestore(&ch->lock, flags); | |
1785 | } | |
1786 | ||
1787 | seq_printf(s, "\nPL08x virtual memcpy channels:\n"); | |
1788 | seq_printf(s, "CHANNEL:\tSTATE:\n"); | |
1789 | seq_printf(s, "--------\t------\n"); | |
1790 | list_for_each_entry(chan, &pl08x->memcpy.channels, chan.device_node) { | |
3e2a037c | 1791 | seq_printf(s, "%s\t\t%s\n", chan->name, |
e8689e63 LW |
1792 | pl08x_state_str(chan->state)); |
1793 | } | |
1794 | ||
1795 | seq_printf(s, "\nPL08x virtual slave channels:\n"); | |
1796 | seq_printf(s, "CHANNEL:\tSTATE:\n"); | |
1797 | seq_printf(s, "--------\t------\n"); | |
1798 | list_for_each_entry(chan, &pl08x->slave.channels, chan.device_node) { | |
3e2a037c | 1799 | seq_printf(s, "%s\t\t%s\n", chan->name, |
e8689e63 LW |
1800 | pl08x_state_str(chan->state)); |
1801 | } | |
1802 | ||
1803 | return 0; | |
1804 | } | |
1805 | ||
1806 | static int pl08x_debugfs_open(struct inode *inode, struct file *file) | |
1807 | { | |
1808 | return single_open(file, pl08x_debugfs_show, inode->i_private); | |
1809 | } | |
1810 | ||
1811 | static const struct file_operations pl08x_debugfs_operations = { | |
1812 | .open = pl08x_debugfs_open, | |
1813 | .read = seq_read, | |
1814 | .llseek = seq_lseek, | |
1815 | .release = single_release, | |
1816 | }; | |
1817 | ||
1818 | static void init_pl08x_debugfs(struct pl08x_driver_data *pl08x) | |
1819 | { | |
1820 | /* Expose a simple debugfs interface to view all clocks */ | |
1821 | (void) debugfs_create_file(dev_name(&pl08x->adev->dev), S_IFREG | S_IRUGO, | |
1822 | NULL, pl08x, | |
1823 | &pl08x_debugfs_operations); | |
1824 | } | |
1825 | ||
1826 | #else | |
1827 | static inline void init_pl08x_debugfs(struct pl08x_driver_data *pl08x) | |
1828 | { | |
1829 | } | |
1830 | #endif | |
1831 | ||
1832 | static int pl08x_probe(struct amba_device *adev, struct amba_id *id) | |
1833 | { | |
1834 | struct pl08x_driver_data *pl08x; | |
f96ca9ec | 1835 | const struct vendor_data *vd = id->data; |
e8689e63 LW |
1836 | int ret = 0; |
1837 | int i; | |
1838 | ||
1839 | ret = amba_request_regions(adev, NULL); | |
1840 | if (ret) | |
1841 | return ret; | |
1842 | ||
1843 | /* Create the driver state holder */ | |
1844 | pl08x = kzalloc(sizeof(struct pl08x_driver_data), GFP_KERNEL); | |
1845 | if (!pl08x) { | |
1846 | ret = -ENOMEM; | |
1847 | goto out_no_pl08x; | |
1848 | } | |
1849 | ||
1850 | /* Initialize memcpy engine */ | |
1851 | dma_cap_set(DMA_MEMCPY, pl08x->memcpy.cap_mask); | |
1852 | pl08x->memcpy.dev = &adev->dev; | |
1853 | pl08x->memcpy.device_alloc_chan_resources = pl08x_alloc_chan_resources; | |
1854 | pl08x->memcpy.device_free_chan_resources = pl08x_free_chan_resources; | |
1855 | pl08x->memcpy.device_prep_dma_memcpy = pl08x_prep_dma_memcpy; | |
1856 | pl08x->memcpy.device_prep_dma_interrupt = pl08x_prep_dma_interrupt; | |
1857 | pl08x->memcpy.device_tx_status = pl08x_dma_tx_status; | |
1858 | pl08x->memcpy.device_issue_pending = pl08x_issue_pending; | |
1859 | pl08x->memcpy.device_control = pl08x_control; | |
1860 | ||
1861 | /* Initialize slave engine */ | |
1862 | dma_cap_set(DMA_SLAVE, pl08x->slave.cap_mask); | |
1863 | pl08x->slave.dev = &adev->dev; | |
1864 | pl08x->slave.device_alloc_chan_resources = pl08x_alloc_chan_resources; | |
1865 | pl08x->slave.device_free_chan_resources = pl08x_free_chan_resources; | |
1866 | pl08x->slave.device_prep_dma_interrupt = pl08x_prep_dma_interrupt; | |
1867 | pl08x->slave.device_tx_status = pl08x_dma_tx_status; | |
1868 | pl08x->slave.device_issue_pending = pl08x_issue_pending; | |
1869 | pl08x->slave.device_prep_slave_sg = pl08x_prep_slave_sg; | |
1870 | pl08x->slave.device_control = pl08x_control; | |
1871 | ||
1872 | /* Get the platform data */ | |
1873 | pl08x->pd = dev_get_platdata(&adev->dev); | |
1874 | if (!pl08x->pd) { | |
1875 | dev_err(&adev->dev, "no platform data supplied\n"); | |
1876 | goto out_no_platdata; | |
1877 | } | |
1878 | ||
1879 | /* Assign useful pointers to the driver state */ | |
1880 | pl08x->adev = adev; | |
1881 | pl08x->vd = vd; | |
1882 | ||
1883 | /* A DMA memory pool for LLIs, align on 1-byte boundary */ | |
1884 | pl08x->pool = dma_pool_create(DRIVER_NAME, &pl08x->adev->dev, | |
1885 | PL08X_LLI_TSFR_SIZE, PL08X_ALIGN, 0); | |
1886 | if (!pl08x->pool) { | |
1887 | ret = -ENOMEM; | |
1888 | goto out_no_lli_pool; | |
1889 | } | |
1890 | ||
1891 | spin_lock_init(&pl08x->lock); | |
1892 | ||
1893 | pl08x->base = ioremap(adev->res.start, resource_size(&adev->res)); | |
1894 | if (!pl08x->base) { | |
1895 | ret = -ENOMEM; | |
1896 | goto out_no_ioremap; | |
1897 | } | |
1898 | ||
1899 | /* Turn on the PL08x */ | |
1900 | pl08x_ensure_on(pl08x); | |
1901 | ||
1902 | /* | |
1903 | * Attach the interrupt handler | |
1904 | */ | |
1905 | writel(0x000000FF, pl08x->base + PL080_ERR_CLEAR); | |
1906 | writel(0x000000FF, pl08x->base + PL080_TC_CLEAR); | |
1907 | ||
1908 | ret = request_irq(adev->irq[0], pl08x_irq, IRQF_DISABLED, | |
b05cd8f4 | 1909 | DRIVER_NAME, pl08x); |
e8689e63 LW |
1910 | if (ret) { |
1911 | dev_err(&adev->dev, "%s failed to request interrupt %d\n", | |
1912 | __func__, adev->irq[0]); | |
1913 | goto out_no_irq; | |
1914 | } | |
1915 | ||
1916 | /* Initialize physical channels */ | |
1917 | pl08x->phy_chans = kmalloc((vd->channels * sizeof(struct pl08x_phy_chan)), | |
1918 | GFP_KERNEL); | |
1919 | if (!pl08x->phy_chans) { | |
1920 | dev_err(&adev->dev, "%s failed to allocate " | |
1921 | "physical channel holders\n", | |
1922 | __func__); | |
1923 | goto out_no_phychans; | |
1924 | } | |
1925 | ||
1926 | for (i = 0; i < vd->channels; i++) { | |
1927 | struct pl08x_phy_chan *ch = &pl08x->phy_chans[i]; | |
1928 | ||
1929 | ch->id = i; | |
1930 | ch->base = pl08x->base + PL080_Cx_BASE(i); | |
1931 | spin_lock_init(&ch->lock); | |
1932 | ch->serving = NULL; | |
1933 | ch->signal = -1; | |
1934 | dev_info(&adev->dev, | |
1935 | "physical channel %d is %s\n", i, | |
1936 | pl08x_phy_channel_busy(ch) ? "BUSY" : "FREE"); | |
1937 | } | |
1938 | ||
1939 | /* Register as many memcpy channels as there are physical channels */ | |
1940 | ret = pl08x_dma_init_virtual_channels(pl08x, &pl08x->memcpy, | |
1941 | pl08x->vd->channels, false); | |
1942 | if (ret <= 0) { | |
1943 | dev_warn(&pl08x->adev->dev, | |
1944 | "%s failed to enumerate memcpy channels - %d\n", | |
1945 | __func__, ret); | |
1946 | goto out_no_memcpy; | |
1947 | } | |
1948 | pl08x->memcpy.chancnt = ret; | |
1949 | ||
1950 | /* Register slave channels */ | |
1951 | ret = pl08x_dma_init_virtual_channels(pl08x, &pl08x->slave, | |
1952 | pl08x->pd->num_slave_channels, | |
1953 | true); | |
1954 | if (ret <= 0) { | |
1955 | dev_warn(&pl08x->adev->dev, | |
1956 | "%s failed to enumerate slave channels - %d\n", | |
1957 | __func__, ret); | |
1958 | goto out_no_slave; | |
1959 | } | |
1960 | pl08x->slave.chancnt = ret; | |
1961 | ||
1962 | ret = dma_async_device_register(&pl08x->memcpy); | |
1963 | if (ret) { | |
1964 | dev_warn(&pl08x->adev->dev, | |
1965 | "%s failed to register memcpy as an async device - %d\n", | |
1966 | __func__, ret); | |
1967 | goto out_no_memcpy_reg; | |
1968 | } | |
1969 | ||
1970 | ret = dma_async_device_register(&pl08x->slave); | |
1971 | if (ret) { | |
1972 | dev_warn(&pl08x->adev->dev, | |
1973 | "%s failed to register slave as an async device - %d\n", | |
1974 | __func__, ret); | |
1975 | goto out_no_slave_reg; | |
1976 | } | |
1977 | ||
1978 | amba_set_drvdata(adev, pl08x); | |
1979 | init_pl08x_debugfs(pl08x); | |
b05cd8f4 RKAL |
1980 | dev_info(&pl08x->adev->dev, "DMA: PL%03x rev%u at 0x%08llx irq %d\n", |
1981 | amba_part(adev), amba_rev(adev), | |
1982 | (unsigned long long)adev->res.start, adev->irq[0]); | |
e8689e63 LW |
1983 | return 0; |
1984 | ||
1985 | out_no_slave_reg: | |
1986 | dma_async_device_unregister(&pl08x->memcpy); | |
1987 | out_no_memcpy_reg: | |
1988 | pl08x_free_virtual_channels(&pl08x->slave); | |
1989 | out_no_slave: | |
1990 | pl08x_free_virtual_channels(&pl08x->memcpy); | |
1991 | out_no_memcpy: | |
1992 | kfree(pl08x->phy_chans); | |
1993 | out_no_phychans: | |
1994 | free_irq(adev->irq[0], pl08x); | |
1995 | out_no_irq: | |
1996 | iounmap(pl08x->base); | |
1997 | out_no_ioremap: | |
1998 | dma_pool_destroy(pl08x->pool); | |
1999 | out_no_lli_pool: | |
2000 | out_no_platdata: | |
2001 | kfree(pl08x); | |
2002 | out_no_pl08x: | |
2003 | amba_release_regions(adev); | |
2004 | return ret; | |
2005 | } | |
2006 | ||
2007 | /* PL080 has 8 channels and the PL080 have just 2 */ | |
2008 | static struct vendor_data vendor_pl080 = { | |
e8689e63 LW |
2009 | .channels = 8, |
2010 | .dualmaster = true, | |
2011 | }; | |
2012 | ||
2013 | static struct vendor_data vendor_pl081 = { | |
e8689e63 LW |
2014 | .channels = 2, |
2015 | .dualmaster = false, | |
2016 | }; | |
2017 | ||
2018 | static struct amba_id pl08x_ids[] = { | |
2019 | /* PL080 */ | |
2020 | { | |
2021 | .id = 0x00041080, | |
2022 | .mask = 0x000fffff, | |
2023 | .data = &vendor_pl080, | |
2024 | }, | |
2025 | /* PL081 */ | |
2026 | { | |
2027 | .id = 0x00041081, | |
2028 | .mask = 0x000fffff, | |
2029 | .data = &vendor_pl081, | |
2030 | }, | |
2031 | /* Nomadik 8815 PL080 variant */ | |
2032 | { | |
2033 | .id = 0x00280880, | |
2034 | .mask = 0x00ffffff, | |
2035 | .data = &vendor_pl080, | |
2036 | }, | |
2037 | { 0, 0 }, | |
2038 | }; | |
2039 | ||
2040 | static struct amba_driver pl08x_amba_driver = { | |
2041 | .drv.name = DRIVER_NAME, | |
2042 | .id_table = pl08x_ids, | |
2043 | .probe = pl08x_probe, | |
2044 | }; | |
2045 | ||
2046 | static int __init pl08x_init(void) | |
2047 | { | |
2048 | int retval; | |
2049 | retval = amba_driver_register(&pl08x_amba_driver); | |
2050 | if (retval) | |
2051 | printk(KERN_WARNING DRIVER_NAME | |
e8b5e11d | 2052 | "failed to register as an AMBA device (%d)\n", |
e8689e63 LW |
2053 | retval); |
2054 | return retval; | |
2055 | } | |
2056 | subsys_initcall(pl08x_init); |