]> git.karo-electronics.de Git - mv-sheeva.git/blob - drivers/dma/amba-pl08x.c
crypto: sha-s390 - Reset index after processing partial block
[mv-sheeva.git] / drivers / dma / amba-pl08x.c
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  *
22  * The full GNU General Public License is in this distribution in the file
23  * 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 any
29  * 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  *
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.
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>
80 #include <linux/interrupt.h>
81 #include <linux/slab.h>
82 #include <linux/dmapool.h>
83 #include <linux/dmaengine.h>
84 #include <linux/amba/bus.h>
85 #include <linux/amba/pl08x.h>
86 #include <linux/debugfs.h>
87 #include <linux/seq_file.h>
88
89 #include <asm/hardware/pl080.h>
90
91 #define DRIVER_NAME     "pl08xdmac"
92
93 /**
94  * struct vendor_data - vendor-specific config parameters for PL08x derivatives
95  * @channels: the number of channels available in this variant
96  * @dualmaster: whether this version supports dual AHB masters or not.
97  */
98 struct vendor_data {
99         u8 channels;
100         bool dualmaster;
101 };
102
103 /*
104  * PL08X private data structures
105  * An LLI struct - see PL08x TRM.  Note that next uses bit[0] as a bus bit,
106  * start & end do not - their bus bit info is in cctl.  Also note that these
107  * are fixed 32-bit quantities.
108  */
109 struct pl08x_lli {
110         u32 src;
111         u32 dst;
112         u32 lli;
113         u32 cctl;
114 };
115
116 /**
117  * struct pl08x_driver_data - the local state holder for the PL08x
118  * @slave: slave engine for this instance
119  * @memcpy: memcpy engine for this instance
120  * @base: virtual memory base (remapped) for the PL08x
121  * @adev: the corresponding AMBA (PrimeCell) bus entry
122  * @vd: vendor data for this PL08x variant
123  * @pd: platform data passed in from the platform/machine
124  * @phy_chans: array of data for the physical channels
125  * @pool: a pool for the LLI descriptors
126  * @pool_ctr: counter of LLIs in the pool
127  * @lli_buses: bitmask to or in to LLI pointer selecting AHB port for LLI fetches
128  * @mem_buses: set to indicate memory transfers on AHB2.
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;
136         const struct vendor_data *vd;
137         struct pl08x_platform_data *pd;
138         struct pl08x_phy_chan *phy_chans;
139         struct dma_pool *pool;
140         int pool_ctr;
141         u8 lli_buses;
142         u8 mem_buses;
143         spinlock_t lock;
144 };
145
146 /*
147  * PL08X specific defines
148  */
149
150 /*
151  * Memory boundaries: the manual for PL08x says that the controller
152  * cannot read past a 1KiB boundary, so these defines are used to
153  * create transfer LLIs that do not cross such boundaries.
154  */
155 #define PL08X_BOUNDARY_SHIFT            (10)    /* 1KB 0x400 */
156 #define PL08X_BOUNDARY_SIZE             (1 << PL08X_BOUNDARY_SHIFT)
157
158 /* Minimum period between work queue runs */
159 #define PL08X_WQ_PERIODMIN      20
160
161 /* Size (bytes) of each LLI buffer allocated for one transfer */
162 # define PL08X_LLI_TSFR_SIZE    0x2000
163
164 /* Maximum times we call dma_pool_alloc on this pool without freeing */
165 #define PL08X_MAX_ALLOCS        0x40
166 #define MAX_NUM_TSFR_LLIS       (PL08X_LLI_TSFR_SIZE/sizeof(struct pl08x_lli))
167 #define PL08X_ALIGN             8
168
169 static inline struct pl08x_dma_chan *to_pl08x_chan(struct dma_chan *chan)
170 {
171         return container_of(chan, struct pl08x_dma_chan, chan);
172 }
173
174 static inline struct pl08x_txd *to_pl08x_txd(struct dma_async_tx_descriptor *tx)
175 {
176         return container_of(tx, struct pl08x_txd, tx);
177 }
178
179 /*
180  * Physical channel handling
181  */
182
183 /* Whether a certain channel is busy or not */
184 static int pl08x_phy_channel_busy(struct pl08x_phy_chan *ch)
185 {
186         unsigned int val;
187
188         val = readl(ch->base + PL080_CH_CONFIG);
189         return val & PL080_CONFIG_ACTIVE;
190 }
191
192 /*
193  * Set the initial DMA register values i.e. those for the first LLI
194  * The next LLI pointer and the configuration interrupt bit have
195  * been set when the LLIs were constructed.  Poke them into the hardware
196  * and start the transfer.
197  */
198 static void pl08x_start_txd(struct pl08x_dma_chan *plchan,
199         struct pl08x_txd *txd)
200 {
201         struct pl08x_driver_data *pl08x = plchan->host;
202         struct pl08x_phy_chan *phychan = plchan->phychan;
203         struct pl08x_lli *lli = &txd->llis_va[0];
204         u32 val;
205
206         plchan->at = txd;
207
208         /* Wait for channel inactive */
209         while (pl08x_phy_channel_busy(phychan))
210                 cpu_relax();
211
212         dev_vdbg(&pl08x->adev->dev,
213                 "WRITE channel %d: csrc=0x%08x, cdst=0x%08x, "
214                 "clli=0x%08x, cctl=0x%08x, ccfg=0x%08x\n",
215                 phychan->id, lli->src, lli->dst, lli->lli, lli->cctl,
216                 txd->ccfg);
217
218         writel(lli->src, phychan->base + PL080_CH_SRC_ADDR);
219         writel(lli->dst, phychan->base + PL080_CH_DST_ADDR);
220         writel(lli->lli, phychan->base + PL080_CH_LLI);
221         writel(lli->cctl, phychan->base + PL080_CH_CONTROL);
222         writel(txd->ccfg, phychan->base + PL080_CH_CONFIG);
223
224         /* Enable the DMA channel */
225         /* Do not access config register until channel shows as disabled */
226         while (readl(pl08x->base + PL080_EN_CHAN) & (1 << phychan->id))
227                 cpu_relax();
228
229         /* Do not access config register until channel shows as inactive */
230         val = readl(phychan->base + PL080_CH_CONFIG);
231         while ((val & PL080_CONFIG_ACTIVE) || (val & PL080_CONFIG_ENABLE))
232                 val = readl(phychan->base + PL080_CH_CONFIG);
233
234         writel(val | PL080_CONFIG_ENABLE, phychan->base + PL080_CH_CONFIG);
235 }
236
237 /*
238  * Overall DMAC remains enabled always.
239  *
240  * Disabling individual channels could lose data.
241  *
242  * Disable the peripheral DMA after disabling the DMAC in order to allow
243  * the DMAC FIFO to drain, and hence allow the channel to show inactive
244  */
245 static void pl08x_pause_phy_chan(struct pl08x_phy_chan *ch)
246 {
247         u32 val;
248
249         /* Set the HALT bit and wait for the FIFO to drain */
250         val = readl(ch->base + PL080_CH_CONFIG);
251         val |= PL080_CONFIG_HALT;
252         writel(val, ch->base + PL080_CH_CONFIG);
253
254         /* Wait for channel inactive */
255         while (pl08x_phy_channel_busy(ch))
256                 cpu_relax();
257 }
258
259 static void pl08x_resume_phy_chan(struct pl08x_phy_chan *ch)
260 {
261         u32 val;
262
263         /* Clear the HALT bit */
264         val = readl(ch->base + PL080_CH_CONFIG);
265         val &= ~PL080_CONFIG_HALT;
266         writel(val, ch->base + PL080_CH_CONFIG);
267 }
268
269
270 /* Stops the channel */
271 static void pl08x_stop_phy_chan(struct pl08x_phy_chan *ch)
272 {
273         u32 val;
274
275         pl08x_pause_phy_chan(ch);
276
277         /* Disable channel */
278         val = readl(ch->base + PL080_CH_CONFIG);
279         val &= ~PL080_CONFIG_ENABLE;
280         val &= ~PL080_CONFIG_ERR_IRQ_MASK;
281         val &= ~PL080_CONFIG_TC_IRQ_MASK;
282         writel(val, ch->base + PL080_CH_CONFIG);
283 }
284
285 static inline u32 get_bytes_in_cctl(u32 cctl)
286 {
287         /* The source width defines the number of bytes */
288         u32 bytes = cctl & PL080_CONTROL_TRANSFER_SIZE_MASK;
289
290         switch (cctl >> PL080_CONTROL_SWIDTH_SHIFT) {
291         case PL080_WIDTH_8BIT:
292                 break;
293         case PL080_WIDTH_16BIT:
294                 bytes *= 2;
295                 break;
296         case PL080_WIDTH_32BIT:
297                 bytes *= 4;
298                 break;
299         }
300         return bytes;
301 }
302
303 /* The channel should be paused when calling this */
304 static u32 pl08x_getbytes_chan(struct pl08x_dma_chan *plchan)
305 {
306         struct pl08x_phy_chan *ch;
307         struct pl08x_txd *txd;
308         unsigned long flags;
309         size_t bytes = 0;
310
311         spin_lock_irqsave(&plchan->lock, flags);
312         ch = plchan->phychan;
313         txd = plchan->at;
314
315         /*
316          * Follow the LLIs to get the number of remaining
317          * bytes in the currently active transaction.
318          */
319         if (ch && txd) {
320                 u32 clli = readl(ch->base + PL080_CH_LLI) & ~PL080_LLI_LM_AHB2;
321
322                 /* First get the remaining bytes in the active transfer */
323                 bytes = get_bytes_in_cctl(readl(ch->base + PL080_CH_CONTROL));
324
325                 if (clli) {
326                         struct pl08x_lli *llis_va = txd->llis_va;
327                         dma_addr_t llis_bus = txd->llis_bus;
328                         int index;
329
330                         BUG_ON(clli < llis_bus || clli >= llis_bus +
331                                 sizeof(struct pl08x_lli) * MAX_NUM_TSFR_LLIS);
332
333                         /*
334                          * Locate the next LLI - as this is an array,
335                          * it's simple maths to find.
336                          */
337                         index = (clli - llis_bus) / sizeof(struct pl08x_lli);
338
339                         for (; index < MAX_NUM_TSFR_LLIS; index++) {
340                                 bytes += get_bytes_in_cctl(llis_va[index].cctl);
341
342                                 /*
343                                  * A LLI pointer of 0 terminates the LLI list
344                                  */
345                                 if (!llis_va[index].lli)
346                                         break;
347                         }
348                 }
349         }
350
351         /* Sum up all queued transactions */
352         if (!list_empty(&plchan->pend_list)) {
353                 struct pl08x_txd *txdi;
354                 list_for_each_entry(txdi, &plchan->pend_list, node) {
355                         bytes += txdi->len;
356                 }
357         }
358
359         spin_unlock_irqrestore(&plchan->lock, flags);
360
361         return bytes;
362 }
363
364 /*
365  * Allocate a physical channel for a virtual channel
366  *
367  * Try to locate a physical channel to be used for this transfer. If all
368  * are taken return NULL and the requester will have to cope by using
369  * some fallback PIO mode or retrying later.
370  */
371 static struct pl08x_phy_chan *
372 pl08x_get_phy_channel(struct pl08x_driver_data *pl08x,
373                       struct pl08x_dma_chan *virt_chan)
374 {
375         struct pl08x_phy_chan *ch = NULL;
376         unsigned long flags;
377         int i;
378
379         for (i = 0; i < pl08x->vd->channels; i++) {
380                 ch = &pl08x->phy_chans[i];
381
382                 spin_lock_irqsave(&ch->lock, flags);
383
384                 if (!ch->serving) {
385                         ch->serving = virt_chan;
386                         ch->signal = -1;
387                         spin_unlock_irqrestore(&ch->lock, flags);
388                         break;
389                 }
390
391                 spin_unlock_irqrestore(&ch->lock, flags);
392         }
393
394         if (i == pl08x->vd->channels) {
395                 /* No physical channel available, cope with it */
396                 return NULL;
397         }
398
399         return ch;
400 }
401
402 static inline void pl08x_put_phy_channel(struct pl08x_driver_data *pl08x,
403                                          struct pl08x_phy_chan *ch)
404 {
405         unsigned long flags;
406
407         /* Stop the channel and clear its interrupts */
408         pl08x_stop_phy_chan(ch);
409         writel((1 << ch->id), pl08x->base + PL080_ERR_CLEAR);
410         writel((1 << ch->id), pl08x->base + PL080_TC_CLEAR);
411
412         /* Mark it as free */
413         spin_lock_irqsave(&ch->lock, flags);
414         ch->serving = NULL;
415         spin_unlock_irqrestore(&ch->lock, flags);
416 }
417
418 /*
419  * LLI handling
420  */
421
422 static inline unsigned int pl08x_get_bytes_for_cctl(unsigned int coded)
423 {
424         switch (coded) {
425         case PL080_WIDTH_8BIT:
426                 return 1;
427         case PL080_WIDTH_16BIT:
428                 return 2;
429         case PL080_WIDTH_32BIT:
430                 return 4;
431         default:
432                 break;
433         }
434         BUG();
435         return 0;
436 }
437
438 static inline u32 pl08x_cctl_bits(u32 cctl, u8 srcwidth, u8 dstwidth,
439                                   size_t tsize)
440 {
441         u32 retbits = cctl;
442
443         /* Remove all src, dst and transfer size bits */
444         retbits &= ~PL080_CONTROL_DWIDTH_MASK;
445         retbits &= ~PL080_CONTROL_SWIDTH_MASK;
446         retbits &= ~PL080_CONTROL_TRANSFER_SIZE_MASK;
447
448         /* Then set the bits according to the parameters */
449         switch (srcwidth) {
450         case 1:
451                 retbits |= PL080_WIDTH_8BIT << PL080_CONTROL_SWIDTH_SHIFT;
452                 break;
453         case 2:
454                 retbits |= PL080_WIDTH_16BIT << PL080_CONTROL_SWIDTH_SHIFT;
455                 break;
456         case 4:
457                 retbits |= PL080_WIDTH_32BIT << PL080_CONTROL_SWIDTH_SHIFT;
458                 break;
459         default:
460                 BUG();
461                 break;
462         }
463
464         switch (dstwidth) {
465         case 1:
466                 retbits |= PL080_WIDTH_8BIT << PL080_CONTROL_DWIDTH_SHIFT;
467                 break;
468         case 2:
469                 retbits |= PL080_WIDTH_16BIT << PL080_CONTROL_DWIDTH_SHIFT;
470                 break;
471         case 4:
472                 retbits |= PL080_WIDTH_32BIT << PL080_CONTROL_DWIDTH_SHIFT;
473                 break;
474         default:
475                 BUG();
476                 break;
477         }
478
479         retbits |= tsize << PL080_CONTROL_TRANSFER_SIZE_SHIFT;
480         return retbits;
481 }
482
483 struct pl08x_lli_build_data {
484         struct pl08x_txd *txd;
485         struct pl08x_driver_data *pl08x;
486         struct pl08x_bus_data srcbus;
487         struct pl08x_bus_data dstbus;
488         size_t remainder;
489 };
490
491 /*
492  * Autoselect a master bus to use for the transfer this prefers the
493  * destination bus if both available if fixed address on one bus the
494  * other will be chosen
495  */
496 static void pl08x_choose_master_bus(struct pl08x_lli_build_data *bd,
497         struct pl08x_bus_data **mbus, struct pl08x_bus_data **sbus, u32 cctl)
498 {
499         if (!(cctl & PL080_CONTROL_DST_INCR)) {
500                 *mbus = &bd->srcbus;
501                 *sbus = &bd->dstbus;
502         } else if (!(cctl & PL080_CONTROL_SRC_INCR)) {
503                 *mbus = &bd->dstbus;
504                 *sbus = &bd->srcbus;
505         } else {
506                 if (bd->dstbus.buswidth == 4) {
507                         *mbus = &bd->dstbus;
508                         *sbus = &bd->srcbus;
509                 } else if (bd->srcbus.buswidth == 4) {
510                         *mbus = &bd->srcbus;
511                         *sbus = &bd->dstbus;
512                 } else if (bd->dstbus.buswidth == 2) {
513                         *mbus = &bd->dstbus;
514                         *sbus = &bd->srcbus;
515                 } else if (bd->srcbus.buswidth == 2) {
516                         *mbus = &bd->srcbus;
517                         *sbus = &bd->dstbus;
518                 } else {
519                         /* bd->srcbus.buswidth == 1 */
520                         *mbus = &bd->dstbus;
521                         *sbus = &bd->srcbus;
522                 }
523         }
524 }
525
526 /*
527  * Fills in one LLI for a certain transfer descriptor and advance the counter
528  */
529 static void pl08x_fill_lli_for_desc(struct pl08x_lli_build_data *bd,
530         int num_llis, int len, u32 cctl)
531 {
532         struct pl08x_lli *llis_va = bd->txd->llis_va;
533         dma_addr_t llis_bus = bd->txd->llis_bus;
534
535         BUG_ON(num_llis >= MAX_NUM_TSFR_LLIS);
536
537         llis_va[num_llis].cctl = cctl;
538         llis_va[num_llis].src = bd->srcbus.addr;
539         llis_va[num_llis].dst = bd->dstbus.addr;
540         llis_va[num_llis].lli = llis_bus + (num_llis + 1) * sizeof(struct pl08x_lli);
541         if (bd->pl08x->lli_buses & PL08X_AHB2)
542                 llis_va[num_llis].lli |= PL080_LLI_LM_AHB2;
543
544         if (cctl & PL080_CONTROL_SRC_INCR)
545                 bd->srcbus.addr += len;
546         if (cctl & PL080_CONTROL_DST_INCR)
547                 bd->dstbus.addr += len;
548
549         BUG_ON(bd->remainder < len);
550
551         bd->remainder -= len;
552 }
553
554 /*
555  * Return number of bytes to fill to boundary, or len.
556  * This calculation works for any value of addr.
557  */
558 static inline size_t pl08x_pre_boundary(u32 addr, size_t len)
559 {
560         size_t boundary_len = PL08X_BOUNDARY_SIZE -
561                         (addr & (PL08X_BOUNDARY_SIZE - 1));
562
563         return min(boundary_len, len);
564 }
565
566 /*
567  * This fills in the table of LLIs for the transfer descriptor
568  * Note that we assume we never have to change the burst sizes
569  * Return 0 for error
570  */
571 static int pl08x_fill_llis_for_desc(struct pl08x_driver_data *pl08x,
572                               struct pl08x_txd *txd)
573 {
574         struct pl08x_bus_data *mbus, *sbus;
575         struct pl08x_lli_build_data bd;
576         int num_llis = 0;
577         u32 cctl;
578         size_t max_bytes_per_lli;
579         size_t total_bytes = 0;
580         struct pl08x_lli *llis_va;
581
582         txd->llis_va = dma_pool_alloc(pl08x->pool, GFP_NOWAIT,
583                                       &txd->llis_bus);
584         if (!txd->llis_va) {
585                 dev_err(&pl08x->adev->dev, "%s no memory for llis\n", __func__);
586                 return 0;
587         }
588
589         pl08x->pool_ctr++;
590
591         /* Get the default CCTL */
592         cctl = txd->cctl;
593
594         bd.txd = txd;
595         bd.pl08x = pl08x;
596         bd.srcbus.addr = txd->src_addr;
597         bd.dstbus.addr = txd->dst_addr;
598
599         /* Find maximum width of the source bus */
600         bd.srcbus.maxwidth =
601                 pl08x_get_bytes_for_cctl((cctl & PL080_CONTROL_SWIDTH_MASK) >>
602                                        PL080_CONTROL_SWIDTH_SHIFT);
603
604         /* Find maximum width of the destination bus */
605         bd.dstbus.maxwidth =
606                 pl08x_get_bytes_for_cctl((cctl & PL080_CONTROL_DWIDTH_MASK) >>
607                                        PL080_CONTROL_DWIDTH_SHIFT);
608
609         /* Set up the bus widths to the maximum */
610         bd.srcbus.buswidth = bd.srcbus.maxwidth;
611         bd.dstbus.buswidth = bd.dstbus.maxwidth;
612         dev_vdbg(&pl08x->adev->dev,
613                  "%s source bus is %d bytes wide, dest bus is %d bytes wide\n",
614                  __func__, bd.srcbus.buswidth, bd.dstbus.buswidth);
615
616
617         /*
618          * Bytes transferred == tsize * MIN(buswidths), not max(buswidths)
619          */
620         max_bytes_per_lli = min(bd.srcbus.buswidth, bd.dstbus.buswidth) *
621                 PL080_CONTROL_TRANSFER_SIZE_MASK;
622         dev_vdbg(&pl08x->adev->dev,
623                  "%s max bytes per lli = %zu\n",
624                  __func__, max_bytes_per_lli);
625
626         /* We need to count this down to zero */
627         bd.remainder = txd->len;
628         dev_vdbg(&pl08x->adev->dev,
629                  "%s remainder = %zu\n",
630                  __func__, bd.remainder);
631
632         /*
633          * Choose bus to align to
634          * - prefers destination bus if both available
635          * - if fixed address on one bus chooses other
636          */
637         pl08x_choose_master_bus(&bd, &mbus, &sbus, cctl);
638
639         if (txd->len < mbus->buswidth) {
640                 /* Less than a bus width available - send as single bytes */
641                 while (bd.remainder) {
642                         dev_vdbg(&pl08x->adev->dev,
643                                  "%s single byte LLIs for a transfer of "
644                                  "less than a bus width (remain 0x%08x)\n",
645                                  __func__, bd.remainder);
646                         cctl = pl08x_cctl_bits(cctl, 1, 1, 1);
647                         pl08x_fill_lli_for_desc(&bd, num_llis++, 1, cctl);
648                         total_bytes++;
649                 }
650         } else {
651                 /* Make one byte LLIs until master bus is aligned */
652                 while ((mbus->addr) % (mbus->buswidth)) {
653                         dev_vdbg(&pl08x->adev->dev,
654                                 "%s adjustment lli for less than bus width "
655                                  "(remain 0x%08x)\n",
656                                  __func__, bd.remainder);
657                         cctl = pl08x_cctl_bits(cctl, 1, 1, 1);
658                         pl08x_fill_lli_for_desc(&bd, num_llis++, 1, cctl);
659                         total_bytes++;
660                 }
661
662                 /*
663                  * Master now aligned
664                  * - if slave is not then we must set its width down
665                  */
666                 if (sbus->addr % sbus->buswidth) {
667                         dev_dbg(&pl08x->adev->dev,
668                                 "%s set down bus width to one byte\n",
669                                  __func__);
670
671                         sbus->buswidth = 1;
672                 }
673
674                 /*
675                  * Make largest possible LLIs until less than one bus
676                  * width left
677                  */
678                 while (bd.remainder > (mbus->buswidth - 1)) {
679                         size_t lli_len, target_len, tsize, odd_bytes;
680
681                         /*
682                          * If enough left try to send max possible,
683                          * otherwise try to send the remainder
684                          */
685                         target_len = min(bd.remainder, max_bytes_per_lli);
686
687                         /*
688                          * Set bus lengths for incrementing buses to the
689                          * number of bytes which fill to next memory boundary,
690                          * limiting on the target length calculated above.
691                          */
692                         if (cctl & PL080_CONTROL_SRC_INCR)
693                                 bd.srcbus.fill_bytes =
694                                         pl08x_pre_boundary(bd.srcbus.addr,
695                                                 target_len);
696                         else
697                                 bd.srcbus.fill_bytes = target_len;
698
699                         if (cctl & PL080_CONTROL_DST_INCR)
700                                 bd.dstbus.fill_bytes =
701                                         pl08x_pre_boundary(bd.dstbus.addr,
702                                                 target_len);
703                         else
704                                 bd.dstbus.fill_bytes = target_len;
705
706                         /* Find the nearest */
707                         lli_len = min(bd.srcbus.fill_bytes,
708                                       bd.dstbus.fill_bytes);
709
710                         BUG_ON(lli_len > bd.remainder);
711
712                         if (lli_len <= 0) {
713                                 dev_err(&pl08x->adev->dev,
714                                         "%s lli_len is %zu, <= 0\n",
715                                                 __func__, lli_len);
716                                 return 0;
717                         }
718
719                         if (lli_len == target_len) {
720                                 /*
721                                  * Can send what we wanted.
722                                  * Maintain alignment
723                                  */
724                                 lli_len = (lli_len/mbus->buswidth) *
725                                                         mbus->buswidth;
726                                 odd_bytes = 0;
727                         } else {
728                                 /*
729                                  * So now we know how many bytes to transfer
730                                  * to get to the nearest boundary.  The next
731                                  * LLI will past the boundary.  However, we
732                                  * may be working to a boundary on the slave
733                                  * bus.  We need to ensure the master stays
734                                  * aligned, and that we are working in
735                                  * multiples of the bus widths.
736                                  */
737                                 odd_bytes = lli_len % mbus->buswidth;
738                                 lli_len -= odd_bytes;
739
740                         }
741
742                         if (lli_len) {
743                                 /*
744                                  * Check against minimum bus alignment:
745                                  * Calculate actual transfer size in relation
746                                  * to bus width an get a maximum remainder of
747                                  * the smallest bus width - 1
748                                  */
749                                 /* FIXME: use round_down()? */
750                                 tsize = lli_len / min(mbus->buswidth,
751                                                       sbus->buswidth);
752                                 lli_len = tsize * min(mbus->buswidth,
753                                                       sbus->buswidth);
754
755                                 if (target_len != lli_len) {
756                                         dev_vdbg(&pl08x->adev->dev,
757                                         "%s can't send what we want. Desired 0x%08zx, lli of 0x%08zx bytes in txd of 0x%08zx\n",
758                                         __func__, target_len, lli_len, txd->len);
759                                 }
760
761                                 cctl = pl08x_cctl_bits(cctl,
762                                                        bd.srcbus.buswidth,
763                                                        bd.dstbus.buswidth,
764                                                        tsize);
765
766                                 dev_vdbg(&pl08x->adev->dev,
767                                         "%s fill lli with single lli chunk of size 0x%08zx (remainder 0x%08zx)\n",
768                                         __func__, lli_len, bd.remainder);
769                                 pl08x_fill_lli_for_desc(&bd, num_llis++,
770                                         lli_len, cctl);
771                                 total_bytes += lli_len;
772                         }
773
774
775                         if (odd_bytes) {
776                                 /*
777                                  * Creep past the boundary, maintaining
778                                  * master alignment
779                                  */
780                                 int j;
781                                 for (j = 0; (j < mbus->buswidth)
782                                                 && (bd.remainder); j++) {
783                                         cctl = pl08x_cctl_bits(cctl, 1, 1, 1);
784                                         dev_vdbg(&pl08x->adev->dev,
785                                                 "%s align with boundary, single byte (remain 0x%08zx)\n",
786                                                 __func__, bd.remainder);
787                                         pl08x_fill_lli_for_desc(&bd,
788                                                 num_llis++, 1, cctl);
789                                         total_bytes++;
790                                 }
791                         }
792                 }
793
794                 /*
795                  * Send any odd bytes
796                  */
797                 while (bd.remainder) {
798                         cctl = pl08x_cctl_bits(cctl, 1, 1, 1);
799                         dev_vdbg(&pl08x->adev->dev,
800                                 "%s align with boundary, single odd byte (remain %zu)\n",
801                                 __func__, bd.remainder);
802                         pl08x_fill_lli_for_desc(&bd, num_llis++, 1, cctl);
803                         total_bytes++;
804                 }
805         }
806         if (total_bytes != txd->len) {
807                 dev_err(&pl08x->adev->dev,
808                         "%s size of encoded lli:s don't match total txd, transferred 0x%08zx from size 0x%08zx\n",
809                         __func__, total_bytes, txd->len);
810                 return 0;
811         }
812
813         if (num_llis >= MAX_NUM_TSFR_LLIS) {
814                 dev_err(&pl08x->adev->dev,
815                         "%s need to increase MAX_NUM_TSFR_LLIS from 0x%08x\n",
816                         __func__, (u32) MAX_NUM_TSFR_LLIS);
817                 return 0;
818         }
819
820         llis_va = txd->llis_va;
821         /* The final LLI terminates the LLI. */
822         llis_va[num_llis - 1].lli = 0;
823         /* The final LLI element shall also fire an interrupt. */
824         llis_va[num_llis - 1].cctl |= PL080_CONTROL_TC_IRQ_EN;
825
826 #ifdef VERBOSE_DEBUG
827         {
828                 int i;
829
830                 for (i = 0; i < num_llis; i++) {
831                         dev_vdbg(&pl08x->adev->dev,
832                                  "lli %d @%p: csrc=0x%08x, cdst=0x%08x, cctl=0x%08x, clli=0x%08x\n",
833                                  i,
834                                  &llis_va[i],
835                                  llis_va[i].src,
836                                  llis_va[i].dst,
837                                  llis_va[i].cctl,
838                                  llis_va[i].lli
839                                 );
840                 }
841         }
842 #endif
843
844         return num_llis;
845 }
846
847 /* You should call this with the struct pl08x lock held */
848 static void pl08x_free_txd(struct pl08x_driver_data *pl08x,
849                            struct pl08x_txd *txd)
850 {
851         /* Free the LLI */
852         dma_pool_free(pl08x->pool, txd->llis_va, txd->llis_bus);
853
854         pl08x->pool_ctr--;
855
856         kfree(txd);
857 }
858
859 static void pl08x_free_txd_list(struct pl08x_driver_data *pl08x,
860                                 struct pl08x_dma_chan *plchan)
861 {
862         struct pl08x_txd *txdi = NULL;
863         struct pl08x_txd *next;
864
865         if (!list_empty(&plchan->pend_list)) {
866                 list_for_each_entry_safe(txdi,
867                                          next, &plchan->pend_list, node) {
868                         list_del(&txdi->node);
869                         pl08x_free_txd(pl08x, txdi);
870                 }
871         }
872 }
873
874 /*
875  * The DMA ENGINE API
876  */
877 static int pl08x_alloc_chan_resources(struct dma_chan *chan)
878 {
879         return 0;
880 }
881
882 static void pl08x_free_chan_resources(struct dma_chan *chan)
883 {
884 }
885
886 /*
887  * This should be called with the channel plchan->lock held
888  */
889 static int prep_phy_channel(struct pl08x_dma_chan *plchan,
890                             struct pl08x_txd *txd)
891 {
892         struct pl08x_driver_data *pl08x = plchan->host;
893         struct pl08x_phy_chan *ch;
894         int ret;
895
896         /* Check if we already have a channel */
897         if (plchan->phychan)
898                 return 0;
899
900         ch = pl08x_get_phy_channel(pl08x, plchan);
901         if (!ch) {
902                 /* No physical channel available, cope with it */
903                 dev_dbg(&pl08x->adev->dev, "no physical channel available for xfer on %s\n", plchan->name);
904                 return -EBUSY;
905         }
906
907         /*
908          * OK we have a physical channel: for memcpy() this is all we
909          * need, but for slaves the physical signals may be muxed!
910          * Can the platform allow us to use this channel?
911          */
912         if (plchan->slave &&
913             ch->signal < 0 &&
914             pl08x->pd->get_signal) {
915                 ret = pl08x->pd->get_signal(plchan);
916                 if (ret < 0) {
917                         dev_dbg(&pl08x->adev->dev,
918                                 "unable to use physical channel %d for transfer on %s due to platform restrictions\n",
919                                 ch->id, plchan->name);
920                         /* Release physical channel & return */
921                         pl08x_put_phy_channel(pl08x, ch);
922                         return -EBUSY;
923                 }
924                 ch->signal = ret;
925
926                 /* Assign the flow control signal to this channel */
927                 if (txd->direction == DMA_TO_DEVICE)
928                         txd->ccfg |= ch->signal << PL080_CONFIG_DST_SEL_SHIFT;
929                 else if (txd->direction == DMA_FROM_DEVICE)
930                         txd->ccfg |= ch->signal << PL080_CONFIG_SRC_SEL_SHIFT;
931         }
932
933         dev_dbg(&pl08x->adev->dev, "allocated physical channel %d and signal %d for xfer on %s\n",
934                  ch->id,
935                  ch->signal,
936                  plchan->name);
937
938         plchan->phychan_hold++;
939         plchan->phychan = ch;
940
941         return 0;
942 }
943
944 static void release_phy_channel(struct pl08x_dma_chan *plchan)
945 {
946         struct pl08x_driver_data *pl08x = plchan->host;
947
948         if ((plchan->phychan->signal >= 0) && pl08x->pd->put_signal) {
949                 pl08x->pd->put_signal(plchan);
950                 plchan->phychan->signal = -1;
951         }
952         pl08x_put_phy_channel(pl08x, plchan->phychan);
953         plchan->phychan = NULL;
954 }
955
956 static dma_cookie_t pl08x_tx_submit(struct dma_async_tx_descriptor *tx)
957 {
958         struct pl08x_dma_chan *plchan = to_pl08x_chan(tx->chan);
959         struct pl08x_txd *txd = to_pl08x_txd(tx);
960         unsigned long flags;
961
962         spin_lock_irqsave(&plchan->lock, flags);
963
964         plchan->chan.cookie += 1;
965         if (plchan->chan.cookie < 0)
966                 plchan->chan.cookie = 1;
967         tx->cookie = plchan->chan.cookie;
968
969         /* Put this onto the pending list */
970         list_add_tail(&txd->node, &plchan->pend_list);
971
972         /*
973          * If there was no physical channel available for this memcpy,
974          * stack the request up and indicate that the channel is waiting
975          * for a free physical channel.
976          */
977         if (!plchan->slave && !plchan->phychan) {
978                 /* Do this memcpy whenever there is a channel ready */
979                 plchan->state = PL08X_CHAN_WAITING;
980                 plchan->waiting = txd;
981         } else {
982                 plchan->phychan_hold--;
983         }
984
985         spin_unlock_irqrestore(&plchan->lock, flags);
986
987         return tx->cookie;
988 }
989
990 static struct dma_async_tx_descriptor *pl08x_prep_dma_interrupt(
991                 struct dma_chan *chan, unsigned long flags)
992 {
993         struct dma_async_tx_descriptor *retval = NULL;
994
995         return retval;
996 }
997
998 /*
999  * Code accessing dma_async_is_complete() in a tight loop may give problems.
1000  * If slaves are relying on interrupts to signal completion this function
1001  * must not be called with interrupts disabled.
1002  */
1003 static enum dma_status
1004 pl08x_dma_tx_status(struct dma_chan *chan,
1005                     dma_cookie_t cookie,
1006                     struct dma_tx_state *txstate)
1007 {
1008         struct pl08x_dma_chan *plchan = to_pl08x_chan(chan);
1009         dma_cookie_t last_used;
1010         dma_cookie_t last_complete;
1011         enum dma_status ret;
1012         u32 bytesleft = 0;
1013
1014         last_used = plchan->chan.cookie;
1015         last_complete = plchan->lc;
1016
1017         ret = dma_async_is_complete(cookie, last_complete, last_used);
1018         if (ret == DMA_SUCCESS) {
1019                 dma_set_tx_state(txstate, last_complete, last_used, 0);
1020                 return ret;
1021         }
1022
1023         /*
1024          * This cookie not complete yet
1025          */
1026         last_used = plchan->chan.cookie;
1027         last_complete = plchan->lc;
1028
1029         /* Get number of bytes left in the active transactions and queue */
1030         bytesleft = pl08x_getbytes_chan(plchan);
1031
1032         dma_set_tx_state(txstate, last_complete, last_used,
1033                          bytesleft);
1034
1035         if (plchan->state == PL08X_CHAN_PAUSED)
1036                 return DMA_PAUSED;
1037
1038         /* Whether waiting or running, we're in progress */
1039         return DMA_IN_PROGRESS;
1040 }
1041
1042 /* PrimeCell DMA extension */
1043 struct burst_table {
1044         int burstwords;
1045         u32 reg;
1046 };
1047
1048 static const struct burst_table burst_sizes[] = {
1049         {
1050                 .burstwords = 256,
1051                 .reg = (PL080_BSIZE_256 << PL080_CONTROL_SB_SIZE_SHIFT) |
1052                         (PL080_BSIZE_256 << PL080_CONTROL_DB_SIZE_SHIFT),
1053         },
1054         {
1055                 .burstwords = 128,
1056                 .reg = (PL080_BSIZE_128 << PL080_CONTROL_SB_SIZE_SHIFT) |
1057                         (PL080_BSIZE_128 << PL080_CONTROL_DB_SIZE_SHIFT),
1058         },
1059         {
1060                 .burstwords = 64,
1061                 .reg = (PL080_BSIZE_64 << PL080_CONTROL_SB_SIZE_SHIFT) |
1062                         (PL080_BSIZE_64 << PL080_CONTROL_DB_SIZE_SHIFT),
1063         },
1064         {
1065                 .burstwords = 32,
1066                 .reg = (PL080_BSIZE_32 << PL080_CONTROL_SB_SIZE_SHIFT) |
1067                         (PL080_BSIZE_32 << PL080_CONTROL_DB_SIZE_SHIFT),
1068         },
1069         {
1070                 .burstwords = 16,
1071                 .reg = (PL080_BSIZE_16 << PL080_CONTROL_SB_SIZE_SHIFT) |
1072                         (PL080_BSIZE_16 << PL080_CONTROL_DB_SIZE_SHIFT),
1073         },
1074         {
1075                 .burstwords = 8,
1076                 .reg = (PL080_BSIZE_8 << PL080_CONTROL_SB_SIZE_SHIFT) |
1077                         (PL080_BSIZE_8 << PL080_CONTROL_DB_SIZE_SHIFT),
1078         },
1079         {
1080                 .burstwords = 4,
1081                 .reg = (PL080_BSIZE_4 << PL080_CONTROL_SB_SIZE_SHIFT) |
1082                         (PL080_BSIZE_4 << PL080_CONTROL_DB_SIZE_SHIFT),
1083         },
1084         {
1085                 .burstwords = 1,
1086                 .reg = (PL080_BSIZE_1 << PL080_CONTROL_SB_SIZE_SHIFT) |
1087                         (PL080_BSIZE_1 << PL080_CONTROL_DB_SIZE_SHIFT),
1088         },
1089 };
1090
1091 static int dma_set_runtime_config(struct dma_chan *chan,
1092                                   struct dma_slave_config *config)
1093 {
1094         struct pl08x_dma_chan *plchan = to_pl08x_chan(chan);
1095         struct pl08x_driver_data *pl08x = plchan->host;
1096         struct pl08x_channel_data *cd = plchan->cd;
1097         enum dma_slave_buswidth addr_width;
1098         dma_addr_t addr;
1099         u32 maxburst;
1100         u32 cctl = 0;
1101         int i;
1102
1103         if (!plchan->slave)
1104                 return -EINVAL;
1105
1106         /* Transfer direction */
1107         plchan->runtime_direction = config->direction;
1108         if (config->direction == DMA_TO_DEVICE) {
1109                 addr = config->dst_addr;
1110                 addr_width = config->dst_addr_width;
1111                 maxburst = config->dst_maxburst;
1112         } else if (config->direction == DMA_FROM_DEVICE) {
1113                 addr = config->src_addr;
1114                 addr_width = config->src_addr_width;
1115                 maxburst = config->src_maxburst;
1116         } else {
1117                 dev_err(&pl08x->adev->dev,
1118                         "bad runtime_config: alien transfer direction\n");
1119                 return -EINVAL;
1120         }
1121
1122         switch (addr_width) {
1123         case DMA_SLAVE_BUSWIDTH_1_BYTE:
1124                 cctl |= (PL080_WIDTH_8BIT << PL080_CONTROL_SWIDTH_SHIFT) |
1125                         (PL080_WIDTH_8BIT << PL080_CONTROL_DWIDTH_SHIFT);
1126                 break;
1127         case DMA_SLAVE_BUSWIDTH_2_BYTES:
1128                 cctl |= (PL080_WIDTH_16BIT << PL080_CONTROL_SWIDTH_SHIFT) |
1129                         (PL080_WIDTH_16BIT << PL080_CONTROL_DWIDTH_SHIFT);
1130                 break;
1131         case DMA_SLAVE_BUSWIDTH_4_BYTES:
1132                 cctl |= (PL080_WIDTH_32BIT << PL080_CONTROL_SWIDTH_SHIFT) |
1133                         (PL080_WIDTH_32BIT << PL080_CONTROL_DWIDTH_SHIFT);
1134                 break;
1135         default:
1136                 dev_err(&pl08x->adev->dev,
1137                         "bad runtime_config: alien address width\n");
1138                 return -EINVAL;
1139         }
1140
1141         /*
1142          * Now decide on a maxburst:
1143          * If this channel will only request single transfers, set this
1144          * down to ONE element.  Also select one element if no maxburst
1145          * is specified.
1146          */
1147         if (plchan->cd->single || maxburst == 0) {
1148                 cctl |= (PL080_BSIZE_1 << PL080_CONTROL_SB_SIZE_SHIFT) |
1149                         (PL080_BSIZE_1 << PL080_CONTROL_DB_SIZE_SHIFT);
1150         } else {
1151                 for (i = 0; i < ARRAY_SIZE(burst_sizes); i++)
1152                         if (burst_sizes[i].burstwords <= maxburst)
1153                                 break;
1154                 cctl |= burst_sizes[i].reg;
1155         }
1156
1157         plchan->runtime_addr = addr;
1158
1159         /* Modify the default channel data to fit PrimeCell request */
1160         cd->cctl = cctl;
1161
1162         dev_dbg(&pl08x->adev->dev,
1163                 "configured channel %s (%s) for %s, data width %d, "
1164                 "maxburst %d words, LE, CCTL=0x%08x\n",
1165                 dma_chan_name(chan), plchan->name,
1166                 (config->direction == DMA_FROM_DEVICE) ? "RX" : "TX",
1167                 addr_width,
1168                 maxburst,
1169                 cctl);
1170
1171         return 0;
1172 }
1173
1174 /*
1175  * Slave transactions callback to the slave device to allow
1176  * synchronization of slave DMA signals with the DMAC enable
1177  */
1178 static void pl08x_issue_pending(struct dma_chan *chan)
1179 {
1180         struct pl08x_dma_chan *plchan = to_pl08x_chan(chan);
1181         unsigned long flags;
1182
1183         spin_lock_irqsave(&plchan->lock, flags);
1184         /* Something is already active, or we're waiting for a channel... */
1185         if (plchan->at || plchan->state == PL08X_CHAN_WAITING) {
1186                 spin_unlock_irqrestore(&plchan->lock, flags);
1187                 return;
1188         }
1189
1190         /* Take the first element in the queue and execute it */
1191         if (!list_empty(&plchan->pend_list)) {
1192                 struct pl08x_txd *next;
1193
1194                 next = list_first_entry(&plchan->pend_list,
1195                                         struct pl08x_txd,
1196                                         node);
1197                 list_del(&next->node);
1198                 plchan->state = PL08X_CHAN_RUNNING;
1199
1200                 pl08x_start_txd(plchan, next);
1201         }
1202
1203         spin_unlock_irqrestore(&plchan->lock, flags);
1204 }
1205
1206 static int pl08x_prep_channel_resources(struct pl08x_dma_chan *plchan,
1207                                         struct pl08x_txd *txd)
1208 {
1209         struct pl08x_driver_data *pl08x = plchan->host;
1210         unsigned long flags;
1211         int num_llis, ret;
1212
1213         num_llis = pl08x_fill_llis_for_desc(pl08x, txd);
1214         if (!num_llis) {
1215                 kfree(txd);
1216                 return -EINVAL;
1217         }
1218
1219         spin_lock_irqsave(&plchan->lock, flags);
1220
1221         /*
1222          * See if we already have a physical channel allocated,
1223          * else this is the time to try to get one.
1224          */
1225         ret = prep_phy_channel(plchan, txd);
1226         if (ret) {
1227                 /*
1228                  * No physical channel was available.
1229                  *
1230                  * memcpy transfers can be sorted out at submission time.
1231                  *
1232                  * Slave transfers may have been denied due to platform
1233                  * channel muxing restrictions.  Since there is no guarantee
1234                  * that this will ever be resolved, and the signal must be
1235                  * acquired AFTER acquiring the physical channel, we will let
1236                  * them be NACK:ed with -EBUSY here. The drivers can retry
1237                  * the prep() call if they are eager on doing this using DMA.
1238                  */
1239                 if (plchan->slave) {
1240                         pl08x_free_txd_list(pl08x, plchan);
1241                         pl08x_free_txd(pl08x, txd);
1242                         spin_unlock_irqrestore(&plchan->lock, flags);
1243                         return -EBUSY;
1244                 }
1245         } else
1246                 /*
1247                  * Else we're all set, paused and ready to roll, status
1248                  * will switch to PL08X_CHAN_RUNNING when we call
1249                  * issue_pending(). If there is something running on the
1250                  * channel already we don't change its state.
1251                  */
1252                 if (plchan->state == PL08X_CHAN_IDLE)
1253                         plchan->state = PL08X_CHAN_PAUSED;
1254
1255         spin_unlock_irqrestore(&plchan->lock, flags);
1256
1257         return 0;
1258 }
1259
1260 /*
1261  * Given the source and destination available bus masks, select which
1262  * will be routed to each port.  We try to have source and destination
1263  * on separate ports, but always respect the allowable settings.
1264  */
1265 static u32 pl08x_select_bus(struct pl08x_driver_data *pl08x, u8 src, u8 dst)
1266 {
1267         u32 cctl = 0;
1268
1269         if (!(dst & PL08X_AHB1) || ((dst & PL08X_AHB2) && (src & PL08X_AHB1)))
1270                 cctl |= PL080_CONTROL_DST_AHB2;
1271         if (!(src & PL08X_AHB1) || ((src & PL08X_AHB2) && !(dst & PL08X_AHB2)))
1272                 cctl |= PL080_CONTROL_SRC_AHB2;
1273
1274         return cctl;
1275 }
1276
1277 static struct pl08x_txd *pl08x_get_txd(struct pl08x_dma_chan *plchan,
1278         unsigned long flags)
1279 {
1280         struct pl08x_txd *txd = kzalloc(sizeof(struct pl08x_txd), GFP_NOWAIT);
1281
1282         if (txd) {
1283                 dma_async_tx_descriptor_init(&txd->tx, &plchan->chan);
1284                 txd->tx.flags = flags;
1285                 txd->tx.tx_submit = pl08x_tx_submit;
1286                 INIT_LIST_HEAD(&txd->node);
1287
1288                 /* Always enable error and terminal interrupts */
1289                 txd->ccfg = PL080_CONFIG_ERR_IRQ_MASK |
1290                             PL080_CONFIG_TC_IRQ_MASK;
1291         }
1292         return txd;
1293 }
1294
1295 /*
1296  * Initialize a descriptor to be used by memcpy submit
1297  */
1298 static struct dma_async_tx_descriptor *pl08x_prep_dma_memcpy(
1299                 struct dma_chan *chan, dma_addr_t dest, dma_addr_t src,
1300                 size_t len, unsigned long flags)
1301 {
1302         struct pl08x_dma_chan *plchan = to_pl08x_chan(chan);
1303         struct pl08x_driver_data *pl08x = plchan->host;
1304         struct pl08x_txd *txd;
1305         int ret;
1306
1307         txd = pl08x_get_txd(plchan, flags);
1308         if (!txd) {
1309                 dev_err(&pl08x->adev->dev,
1310                         "%s no memory for descriptor\n", __func__);
1311                 return NULL;
1312         }
1313
1314         txd->direction = DMA_NONE;
1315         txd->src_addr = src;
1316         txd->dst_addr = dest;
1317         txd->len = len;
1318
1319         /* Set platform data for m2m */
1320         txd->ccfg |= PL080_FLOW_MEM2MEM << PL080_CONFIG_FLOW_CONTROL_SHIFT;
1321         txd->cctl = pl08x->pd->memcpy_channel.cctl &
1322                         ~(PL080_CONTROL_DST_AHB2 | PL080_CONTROL_SRC_AHB2);
1323
1324         /* Both to be incremented or the code will break */
1325         txd->cctl |= PL080_CONTROL_SRC_INCR | PL080_CONTROL_DST_INCR;
1326
1327         if (pl08x->vd->dualmaster)
1328                 txd->cctl |= pl08x_select_bus(pl08x,
1329                                         pl08x->mem_buses, pl08x->mem_buses);
1330
1331         ret = pl08x_prep_channel_resources(plchan, txd);
1332         if (ret)
1333                 return NULL;
1334
1335         return &txd->tx;
1336 }
1337
1338 static struct dma_async_tx_descriptor *pl08x_prep_slave_sg(
1339                 struct dma_chan *chan, struct scatterlist *sgl,
1340                 unsigned int sg_len, enum dma_data_direction direction,
1341                 unsigned long flags)
1342 {
1343         struct pl08x_dma_chan *plchan = to_pl08x_chan(chan);
1344         struct pl08x_driver_data *pl08x = plchan->host;
1345         struct pl08x_txd *txd;
1346         u8 src_buses, dst_buses;
1347         int ret;
1348
1349         /*
1350          * Current implementation ASSUMES only one sg
1351          */
1352         if (sg_len != 1) {
1353                 dev_err(&pl08x->adev->dev, "%s prepared too long sglist\n",
1354                         __func__);
1355                 BUG();
1356         }
1357
1358         dev_dbg(&pl08x->adev->dev, "%s prepare transaction of %d bytes from %s\n",
1359                 __func__, sgl->length, plchan->name);
1360
1361         txd = pl08x_get_txd(plchan, flags);
1362         if (!txd) {
1363                 dev_err(&pl08x->adev->dev, "%s no txd\n", __func__);
1364                 return NULL;
1365         }
1366
1367         if (direction != plchan->runtime_direction)
1368                 dev_err(&pl08x->adev->dev, "%s DMA setup does not match "
1369                         "the direction configured for the PrimeCell\n",
1370                         __func__);
1371
1372         /*
1373          * Set up addresses, the PrimeCell configured address
1374          * will take precedence since this may configure the
1375          * channel target address dynamically at runtime.
1376          */
1377         txd->direction = direction;
1378         txd->len = sgl->length;
1379
1380         txd->cctl = plchan->cd->cctl &
1381                         ~(PL080_CONTROL_SRC_AHB2 | PL080_CONTROL_DST_AHB2 |
1382                           PL080_CONTROL_SRC_INCR | PL080_CONTROL_DST_INCR |
1383                           PL080_CONTROL_PROT_MASK);
1384
1385         /* Access the cell in privileged mode, non-bufferable, non-cacheable */
1386         txd->cctl |= PL080_CONTROL_PROT_SYS;
1387
1388         if (direction == DMA_TO_DEVICE) {
1389                 txd->ccfg |= PL080_FLOW_MEM2PER << PL080_CONFIG_FLOW_CONTROL_SHIFT;
1390                 txd->cctl |= PL080_CONTROL_SRC_INCR;
1391                 txd->src_addr = sgl->dma_address;
1392                 if (plchan->runtime_addr)
1393                         txd->dst_addr = plchan->runtime_addr;
1394                 else
1395                         txd->dst_addr = plchan->cd->addr;
1396                 src_buses = pl08x->mem_buses;
1397                 dst_buses = plchan->cd->periph_buses;
1398         } else if (direction == DMA_FROM_DEVICE) {
1399                 txd->ccfg |= PL080_FLOW_PER2MEM << PL080_CONFIG_FLOW_CONTROL_SHIFT;
1400                 txd->cctl |= PL080_CONTROL_DST_INCR;
1401                 if (plchan->runtime_addr)
1402                         txd->src_addr = plchan->runtime_addr;
1403                 else
1404                         txd->src_addr = plchan->cd->addr;
1405                 txd->dst_addr = sgl->dma_address;
1406                 src_buses = plchan->cd->periph_buses;
1407                 dst_buses = pl08x->mem_buses;
1408         } else {
1409                 dev_err(&pl08x->adev->dev,
1410                         "%s direction unsupported\n", __func__);
1411                 return NULL;
1412         }
1413
1414         txd->cctl |= pl08x_select_bus(pl08x, src_buses, dst_buses);
1415
1416         ret = pl08x_prep_channel_resources(plchan, txd);
1417         if (ret)
1418                 return NULL;
1419
1420         return &txd->tx;
1421 }
1422
1423 static int pl08x_control(struct dma_chan *chan, enum dma_ctrl_cmd cmd,
1424                          unsigned long arg)
1425 {
1426         struct pl08x_dma_chan *plchan = to_pl08x_chan(chan);
1427         struct pl08x_driver_data *pl08x = plchan->host;
1428         unsigned long flags;
1429         int ret = 0;
1430
1431         /* Controls applicable to inactive channels */
1432         if (cmd == DMA_SLAVE_CONFIG) {
1433                 return dma_set_runtime_config(chan,
1434                                               (struct dma_slave_config *)arg);
1435         }
1436
1437         /*
1438          * Anything succeeds on channels with no physical allocation and
1439          * no queued transfers.
1440          */
1441         spin_lock_irqsave(&plchan->lock, flags);
1442         if (!plchan->phychan && !plchan->at) {
1443                 spin_unlock_irqrestore(&plchan->lock, flags);
1444                 return 0;
1445         }
1446
1447         switch (cmd) {
1448         case DMA_TERMINATE_ALL:
1449                 plchan->state = PL08X_CHAN_IDLE;
1450
1451                 if (plchan->phychan) {
1452                         pl08x_stop_phy_chan(plchan->phychan);
1453
1454                         /*
1455                          * Mark physical channel as free and free any slave
1456                          * signal
1457                          */
1458                         release_phy_channel(plchan);
1459                 }
1460                 /* Dequeue jobs and free LLIs */
1461                 if (plchan->at) {
1462                         pl08x_free_txd(pl08x, plchan->at);
1463                         plchan->at = NULL;
1464                 }
1465                 /* Dequeue jobs not yet fired as well */
1466                 pl08x_free_txd_list(pl08x, plchan);
1467                 break;
1468         case DMA_PAUSE:
1469                 pl08x_pause_phy_chan(plchan->phychan);
1470                 plchan->state = PL08X_CHAN_PAUSED;
1471                 break;
1472         case DMA_RESUME:
1473                 pl08x_resume_phy_chan(plchan->phychan);
1474                 plchan->state = PL08X_CHAN_RUNNING;
1475                 break;
1476         default:
1477                 /* Unknown command */
1478                 ret = -ENXIO;
1479                 break;
1480         }
1481
1482         spin_unlock_irqrestore(&plchan->lock, flags);
1483
1484         return ret;
1485 }
1486
1487 bool pl08x_filter_id(struct dma_chan *chan, void *chan_id)
1488 {
1489         struct pl08x_dma_chan *plchan = to_pl08x_chan(chan);
1490         char *name = chan_id;
1491
1492         /* Check that the channel is not taken! */
1493         if (!strcmp(plchan->name, name))
1494                 return true;
1495
1496         return false;
1497 }
1498
1499 /*
1500  * Just check that the device is there and active
1501  * TODO: turn this bit on/off depending on the number of physical channels
1502  * actually used, if it is zero... well shut it off. That will save some
1503  * power. Cut the clock at the same time.
1504  */
1505 static void pl08x_ensure_on(struct pl08x_driver_data *pl08x)
1506 {
1507         u32 val;
1508
1509         val = readl(pl08x->base + PL080_CONFIG);
1510         val &= ~(PL080_CONFIG_M2_BE | PL080_CONFIG_M1_BE | PL080_CONFIG_ENABLE);
1511         /* We implicitly clear bit 1 and that means little-endian mode */
1512         val |= PL080_CONFIG_ENABLE;
1513         writel(val, pl08x->base + PL080_CONFIG);
1514 }
1515
1516 static void pl08x_unmap_buffers(struct pl08x_txd *txd)
1517 {
1518         struct device *dev = txd->tx.chan->device->dev;
1519
1520         if (!(txd->tx.flags & DMA_COMPL_SKIP_SRC_UNMAP)) {
1521                 if (txd->tx.flags & DMA_COMPL_SRC_UNMAP_SINGLE)
1522                         dma_unmap_single(dev, txd->src_addr, txd->len,
1523                                 DMA_TO_DEVICE);
1524                 else
1525                         dma_unmap_page(dev, txd->src_addr, txd->len,
1526                                 DMA_TO_DEVICE);
1527         }
1528         if (!(txd->tx.flags & DMA_COMPL_SKIP_DEST_UNMAP)) {
1529                 if (txd->tx.flags & DMA_COMPL_DEST_UNMAP_SINGLE)
1530                         dma_unmap_single(dev, txd->dst_addr, txd->len,
1531                                 DMA_FROM_DEVICE);
1532                 else
1533                         dma_unmap_page(dev, txd->dst_addr, txd->len,
1534                                 DMA_FROM_DEVICE);
1535         }
1536 }
1537
1538 static void pl08x_tasklet(unsigned long data)
1539 {
1540         struct pl08x_dma_chan *plchan = (struct pl08x_dma_chan *) data;
1541         struct pl08x_driver_data *pl08x = plchan->host;
1542         struct pl08x_txd *txd;
1543         unsigned long flags;
1544
1545         spin_lock_irqsave(&plchan->lock, flags);
1546
1547         txd = plchan->at;
1548         plchan->at = NULL;
1549
1550         if (txd) {
1551                 /* Update last completed */
1552                 plchan->lc = txd->tx.cookie;
1553         }
1554
1555         /* If a new descriptor is queued, set it up plchan->at is NULL here */
1556         if (!list_empty(&plchan->pend_list)) {
1557                 struct pl08x_txd *next;
1558
1559                 next = list_first_entry(&plchan->pend_list,
1560                                         struct pl08x_txd,
1561                                         node);
1562                 list_del(&next->node);
1563
1564                 pl08x_start_txd(plchan, next);
1565         } else if (plchan->phychan_hold) {
1566                 /*
1567                  * This channel is still in use - we have a new txd being
1568                  * prepared and will soon be queued.  Don't give up the
1569                  * physical channel.
1570                  */
1571         } else {
1572                 struct pl08x_dma_chan *waiting = NULL;
1573
1574                 /*
1575                  * No more jobs, so free up the physical channel
1576                  * Free any allocated signal on slave transfers too
1577                  */
1578                 release_phy_channel(plchan);
1579                 plchan->state = PL08X_CHAN_IDLE;
1580
1581                 /*
1582                  * And NOW before anyone else can grab that free:d up
1583                  * physical channel, see if there is some memcpy pending
1584                  * that seriously needs to start because of being stacked
1585                  * up while we were choking the physical channels with data.
1586                  */
1587                 list_for_each_entry(waiting, &pl08x->memcpy.channels,
1588                                     chan.device_node) {
1589                   if (waiting->state == PL08X_CHAN_WAITING &&
1590                             waiting->waiting != NULL) {
1591                                 int ret;
1592
1593                                 /* This should REALLY not fail now */
1594                                 ret = prep_phy_channel(waiting,
1595                                                        waiting->waiting);
1596                                 BUG_ON(ret);
1597                                 waiting->phychan_hold--;
1598                                 waiting->state = PL08X_CHAN_RUNNING;
1599                                 waiting->waiting = NULL;
1600                                 pl08x_issue_pending(&waiting->chan);
1601                                 break;
1602                         }
1603                 }
1604         }
1605
1606         spin_unlock_irqrestore(&plchan->lock, flags);
1607
1608         if (txd) {
1609                 dma_async_tx_callback callback = txd->tx.callback;
1610                 void *callback_param = txd->tx.callback_param;
1611
1612                 /* Don't try to unmap buffers on slave channels */
1613                 if (!plchan->slave)
1614                         pl08x_unmap_buffers(txd);
1615
1616                 /* Free the descriptor */
1617                 spin_lock_irqsave(&plchan->lock, flags);
1618                 pl08x_free_txd(pl08x, txd);
1619                 spin_unlock_irqrestore(&plchan->lock, flags);
1620
1621                 /* Callback to signal completion */
1622                 if (callback)
1623                         callback(callback_param);
1624         }
1625 }
1626
1627 static irqreturn_t pl08x_irq(int irq, void *dev)
1628 {
1629         struct pl08x_driver_data *pl08x = dev;
1630         u32 mask = 0;
1631         u32 val;
1632         int i;
1633
1634         val = readl(pl08x->base + PL080_ERR_STATUS);
1635         if (val) {
1636                 /* An error interrupt (on one or more channels) */
1637                 dev_err(&pl08x->adev->dev,
1638                         "%s error interrupt, register value 0x%08x\n",
1639                                 __func__, val);
1640                 /*
1641                  * Simply clear ALL PL08X error interrupts,
1642                  * regardless of channel and cause
1643                  * FIXME: should be 0x00000003 on PL081 really.
1644                  */
1645                 writel(0x000000FF, pl08x->base + PL080_ERR_CLEAR);
1646         }
1647         val = readl(pl08x->base + PL080_INT_STATUS);
1648         for (i = 0; i < pl08x->vd->channels; i++) {
1649                 if ((1 << i) & val) {
1650                         /* Locate physical channel */
1651                         struct pl08x_phy_chan *phychan = &pl08x->phy_chans[i];
1652                         struct pl08x_dma_chan *plchan = phychan->serving;
1653
1654                         /* Schedule tasklet on this channel */
1655                         tasklet_schedule(&plchan->tasklet);
1656
1657                         mask |= (1 << i);
1658                 }
1659         }
1660         /* Clear only the terminal interrupts on channels we processed */
1661         writel(mask, pl08x->base + PL080_TC_CLEAR);
1662
1663         return mask ? IRQ_HANDLED : IRQ_NONE;
1664 }
1665
1666 /*
1667  * Initialise the DMAC memcpy/slave channels.
1668  * Make a local wrapper to hold required data
1669  */
1670 static int pl08x_dma_init_virtual_channels(struct pl08x_driver_data *pl08x,
1671                                            struct dma_device *dmadev,
1672                                            unsigned int channels,
1673                                            bool slave)
1674 {
1675         struct pl08x_dma_chan *chan;
1676         int i;
1677
1678         INIT_LIST_HEAD(&dmadev->channels);
1679
1680         /*
1681          * Register as many many memcpy as we have physical channels,
1682          * we won't always be able to use all but the code will have
1683          * to cope with that situation.
1684          */
1685         for (i = 0; i < channels; i++) {
1686                 chan = kzalloc(sizeof(struct pl08x_dma_chan), GFP_KERNEL);
1687                 if (!chan) {
1688                         dev_err(&pl08x->adev->dev,
1689                                 "%s no memory for channel\n", __func__);
1690                         return -ENOMEM;
1691                 }
1692
1693                 chan->host = pl08x;
1694                 chan->state = PL08X_CHAN_IDLE;
1695
1696                 if (slave) {
1697                         chan->slave = true;
1698                         chan->name = pl08x->pd->slave_channels[i].bus_id;
1699                         chan->cd = &pl08x->pd->slave_channels[i];
1700                 } else {
1701                         chan->cd = &pl08x->pd->memcpy_channel;
1702                         chan->name = kasprintf(GFP_KERNEL, "memcpy%d", i);
1703                         if (!chan->name) {
1704                                 kfree(chan);
1705                                 return -ENOMEM;
1706                         }
1707                 }
1708                 if (chan->cd->circular_buffer) {
1709                         dev_err(&pl08x->adev->dev,
1710                                 "channel %s: circular buffers not supported\n",
1711                                 chan->name);
1712                         kfree(chan);
1713                         continue;
1714                 }
1715                 dev_info(&pl08x->adev->dev,
1716                          "initialize virtual channel \"%s\"\n",
1717                          chan->name);
1718
1719                 chan->chan.device = dmadev;
1720                 chan->chan.cookie = 0;
1721                 chan->lc = 0;
1722
1723                 spin_lock_init(&chan->lock);
1724                 INIT_LIST_HEAD(&chan->pend_list);
1725                 tasklet_init(&chan->tasklet, pl08x_tasklet,
1726                              (unsigned long) chan);
1727
1728                 list_add_tail(&chan->chan.device_node, &dmadev->channels);
1729         }
1730         dev_info(&pl08x->adev->dev, "initialized %d virtual %s channels\n",
1731                  i, slave ? "slave" : "memcpy");
1732         return i;
1733 }
1734
1735 static void pl08x_free_virtual_channels(struct dma_device *dmadev)
1736 {
1737         struct pl08x_dma_chan *chan = NULL;
1738         struct pl08x_dma_chan *next;
1739
1740         list_for_each_entry_safe(chan,
1741                                  next, &dmadev->channels, chan.device_node) {
1742                 list_del(&chan->chan.device_node);
1743                 kfree(chan);
1744         }
1745 }
1746
1747 #ifdef CONFIG_DEBUG_FS
1748 static const char *pl08x_state_str(enum pl08x_dma_chan_state state)
1749 {
1750         switch (state) {
1751         case PL08X_CHAN_IDLE:
1752                 return "idle";
1753         case PL08X_CHAN_RUNNING:
1754                 return "running";
1755         case PL08X_CHAN_PAUSED:
1756                 return "paused";
1757         case PL08X_CHAN_WAITING:
1758                 return "waiting";
1759         default:
1760                 break;
1761         }
1762         return "UNKNOWN STATE";
1763 }
1764
1765 static int pl08x_debugfs_show(struct seq_file *s, void *data)
1766 {
1767         struct pl08x_driver_data *pl08x = s->private;
1768         struct pl08x_dma_chan *chan;
1769         struct pl08x_phy_chan *ch;
1770         unsigned long flags;
1771         int i;
1772
1773         seq_printf(s, "PL08x physical channels:\n");
1774         seq_printf(s, "CHANNEL:\tUSER:\n");
1775         seq_printf(s, "--------\t-----\n");
1776         for (i = 0; i < pl08x->vd->channels; i++) {
1777                 struct pl08x_dma_chan *virt_chan;
1778
1779                 ch = &pl08x->phy_chans[i];
1780
1781                 spin_lock_irqsave(&ch->lock, flags);
1782                 virt_chan = ch->serving;
1783
1784                 seq_printf(s, "%d\t\t%s\n",
1785                            ch->id, virt_chan ? virt_chan->name : "(none)");
1786
1787                 spin_unlock_irqrestore(&ch->lock, flags);
1788         }
1789
1790         seq_printf(s, "\nPL08x virtual memcpy channels:\n");
1791         seq_printf(s, "CHANNEL:\tSTATE:\n");
1792         seq_printf(s, "--------\t------\n");
1793         list_for_each_entry(chan, &pl08x->memcpy.channels, chan.device_node) {
1794                 seq_printf(s, "%s\t\t%s\n", chan->name,
1795                            pl08x_state_str(chan->state));
1796         }
1797
1798         seq_printf(s, "\nPL08x virtual slave channels:\n");
1799         seq_printf(s, "CHANNEL:\tSTATE:\n");
1800         seq_printf(s, "--------\t------\n");
1801         list_for_each_entry(chan, &pl08x->slave.channels, chan.device_node) {
1802                 seq_printf(s, "%s\t\t%s\n", chan->name,
1803                            pl08x_state_str(chan->state));
1804         }
1805
1806         return 0;
1807 }
1808
1809 static int pl08x_debugfs_open(struct inode *inode, struct file *file)
1810 {
1811         return single_open(file, pl08x_debugfs_show, inode->i_private);
1812 }
1813
1814 static const struct file_operations pl08x_debugfs_operations = {
1815         .open           = pl08x_debugfs_open,
1816         .read           = seq_read,
1817         .llseek         = seq_lseek,
1818         .release        = single_release,
1819 };
1820
1821 static void init_pl08x_debugfs(struct pl08x_driver_data *pl08x)
1822 {
1823         /* Expose a simple debugfs interface to view all clocks */
1824         (void) debugfs_create_file(dev_name(&pl08x->adev->dev), S_IFREG | S_IRUGO,
1825                                    NULL, pl08x,
1826                                    &pl08x_debugfs_operations);
1827 }
1828
1829 #else
1830 static inline void init_pl08x_debugfs(struct pl08x_driver_data *pl08x)
1831 {
1832 }
1833 #endif
1834
1835 static int pl08x_probe(struct amba_device *adev, struct amba_id *id)
1836 {
1837         struct pl08x_driver_data *pl08x;
1838         const struct vendor_data *vd = id->data;
1839         int ret = 0;
1840         int i;
1841
1842         ret = amba_request_regions(adev, NULL);
1843         if (ret)
1844                 return ret;
1845
1846         /* Create the driver state holder */
1847         pl08x = kzalloc(sizeof(struct pl08x_driver_data), GFP_KERNEL);
1848         if (!pl08x) {
1849                 ret = -ENOMEM;
1850                 goto out_no_pl08x;
1851         }
1852
1853         /* Initialize memcpy engine */
1854         dma_cap_set(DMA_MEMCPY, pl08x->memcpy.cap_mask);
1855         pl08x->memcpy.dev = &adev->dev;
1856         pl08x->memcpy.device_alloc_chan_resources = pl08x_alloc_chan_resources;
1857         pl08x->memcpy.device_free_chan_resources = pl08x_free_chan_resources;
1858         pl08x->memcpy.device_prep_dma_memcpy = pl08x_prep_dma_memcpy;
1859         pl08x->memcpy.device_prep_dma_interrupt = pl08x_prep_dma_interrupt;
1860         pl08x->memcpy.device_tx_status = pl08x_dma_tx_status;
1861         pl08x->memcpy.device_issue_pending = pl08x_issue_pending;
1862         pl08x->memcpy.device_control = pl08x_control;
1863
1864         /* Initialize slave engine */
1865         dma_cap_set(DMA_SLAVE, pl08x->slave.cap_mask);
1866         pl08x->slave.dev = &adev->dev;
1867         pl08x->slave.device_alloc_chan_resources = pl08x_alloc_chan_resources;
1868         pl08x->slave.device_free_chan_resources = pl08x_free_chan_resources;
1869         pl08x->slave.device_prep_dma_interrupt = pl08x_prep_dma_interrupt;
1870         pl08x->slave.device_tx_status = pl08x_dma_tx_status;
1871         pl08x->slave.device_issue_pending = pl08x_issue_pending;
1872         pl08x->slave.device_prep_slave_sg = pl08x_prep_slave_sg;
1873         pl08x->slave.device_control = pl08x_control;
1874
1875         /* Get the platform data */
1876         pl08x->pd = dev_get_platdata(&adev->dev);
1877         if (!pl08x->pd) {
1878                 dev_err(&adev->dev, "no platform data supplied\n");
1879                 goto out_no_platdata;
1880         }
1881
1882         /* Assign useful pointers to the driver state */
1883         pl08x->adev = adev;
1884         pl08x->vd = vd;
1885
1886         /* By default, AHB1 only.  If dualmaster, from platform */
1887         pl08x->lli_buses = PL08X_AHB1;
1888         pl08x->mem_buses = PL08X_AHB1;
1889         if (pl08x->vd->dualmaster) {
1890                 pl08x->lli_buses = pl08x->pd->lli_buses;
1891                 pl08x->mem_buses = pl08x->pd->mem_buses;
1892         }
1893
1894         /* A DMA memory pool for LLIs, align on 1-byte boundary */
1895         pl08x->pool = dma_pool_create(DRIVER_NAME, &pl08x->adev->dev,
1896                         PL08X_LLI_TSFR_SIZE, PL08X_ALIGN, 0);
1897         if (!pl08x->pool) {
1898                 ret = -ENOMEM;
1899                 goto out_no_lli_pool;
1900         }
1901
1902         spin_lock_init(&pl08x->lock);
1903
1904         pl08x->base = ioremap(adev->res.start, resource_size(&adev->res));
1905         if (!pl08x->base) {
1906                 ret = -ENOMEM;
1907                 goto out_no_ioremap;
1908         }
1909
1910         /* Turn on the PL08x */
1911         pl08x_ensure_on(pl08x);
1912
1913         /* Attach the interrupt handler */
1914         writel(0x000000FF, pl08x->base + PL080_ERR_CLEAR);
1915         writel(0x000000FF, pl08x->base + PL080_TC_CLEAR);
1916
1917         ret = request_irq(adev->irq[0], pl08x_irq, IRQF_DISABLED,
1918                           DRIVER_NAME, pl08x);
1919         if (ret) {
1920                 dev_err(&adev->dev, "%s failed to request interrupt %d\n",
1921                         __func__, adev->irq[0]);
1922                 goto out_no_irq;
1923         }
1924
1925         /* Initialize physical channels */
1926         pl08x->phy_chans = kmalloc((vd->channels * sizeof(struct pl08x_phy_chan)),
1927                         GFP_KERNEL);
1928         if (!pl08x->phy_chans) {
1929                 dev_err(&adev->dev, "%s failed to allocate "
1930                         "physical channel holders\n",
1931                         __func__);
1932                 goto out_no_phychans;
1933         }
1934
1935         for (i = 0; i < vd->channels; i++) {
1936                 struct pl08x_phy_chan *ch = &pl08x->phy_chans[i];
1937
1938                 ch->id = i;
1939                 ch->base = pl08x->base + PL080_Cx_BASE(i);
1940                 spin_lock_init(&ch->lock);
1941                 ch->serving = NULL;
1942                 ch->signal = -1;
1943                 dev_info(&adev->dev,
1944                          "physical channel %d is %s\n", i,
1945                          pl08x_phy_channel_busy(ch) ? "BUSY" : "FREE");
1946         }
1947
1948         /* Register as many memcpy channels as there are physical channels */
1949         ret = pl08x_dma_init_virtual_channels(pl08x, &pl08x->memcpy,
1950                                               pl08x->vd->channels, false);
1951         if (ret <= 0) {
1952                 dev_warn(&pl08x->adev->dev,
1953                          "%s failed to enumerate memcpy channels - %d\n",
1954                          __func__, ret);
1955                 goto out_no_memcpy;
1956         }
1957         pl08x->memcpy.chancnt = ret;
1958
1959         /* Register slave channels */
1960         ret = pl08x_dma_init_virtual_channels(pl08x, &pl08x->slave,
1961                                               pl08x->pd->num_slave_channels,
1962                                               true);
1963         if (ret <= 0) {
1964                 dev_warn(&pl08x->adev->dev,
1965                         "%s failed to enumerate slave channels - %d\n",
1966                                 __func__, ret);
1967                 goto out_no_slave;
1968         }
1969         pl08x->slave.chancnt = ret;
1970
1971         ret = dma_async_device_register(&pl08x->memcpy);
1972         if (ret) {
1973                 dev_warn(&pl08x->adev->dev,
1974                         "%s failed to register memcpy as an async device - %d\n",
1975                         __func__, ret);
1976                 goto out_no_memcpy_reg;
1977         }
1978
1979         ret = dma_async_device_register(&pl08x->slave);
1980         if (ret) {
1981                 dev_warn(&pl08x->adev->dev,
1982                         "%s failed to register slave as an async device - %d\n",
1983                         __func__, ret);
1984                 goto out_no_slave_reg;
1985         }
1986
1987         amba_set_drvdata(adev, pl08x);
1988         init_pl08x_debugfs(pl08x);
1989         dev_info(&pl08x->adev->dev, "DMA: PL%03x rev%u at 0x%08llx irq %d\n",
1990                  amba_part(adev), amba_rev(adev),
1991                  (unsigned long long)adev->res.start, adev->irq[0]);
1992         return 0;
1993
1994 out_no_slave_reg:
1995         dma_async_device_unregister(&pl08x->memcpy);
1996 out_no_memcpy_reg:
1997         pl08x_free_virtual_channels(&pl08x->slave);
1998 out_no_slave:
1999         pl08x_free_virtual_channels(&pl08x->memcpy);
2000 out_no_memcpy:
2001         kfree(pl08x->phy_chans);
2002 out_no_phychans:
2003         free_irq(adev->irq[0], pl08x);
2004 out_no_irq:
2005         iounmap(pl08x->base);
2006 out_no_ioremap:
2007         dma_pool_destroy(pl08x->pool);
2008 out_no_lli_pool:
2009 out_no_platdata:
2010         kfree(pl08x);
2011 out_no_pl08x:
2012         amba_release_regions(adev);
2013         return ret;
2014 }
2015
2016 /* PL080 has 8 channels and the PL080 have just 2 */
2017 static struct vendor_data vendor_pl080 = {
2018         .channels = 8,
2019         .dualmaster = true,
2020 };
2021
2022 static struct vendor_data vendor_pl081 = {
2023         .channels = 2,
2024         .dualmaster = false,
2025 };
2026
2027 static struct amba_id pl08x_ids[] = {
2028         /* PL080 */
2029         {
2030                 .id     = 0x00041080,
2031                 .mask   = 0x000fffff,
2032                 .data   = &vendor_pl080,
2033         },
2034         /* PL081 */
2035         {
2036                 .id     = 0x00041081,
2037                 .mask   = 0x000fffff,
2038                 .data   = &vendor_pl081,
2039         },
2040         /* Nomadik 8815 PL080 variant */
2041         {
2042                 .id     = 0x00280880,
2043                 .mask   = 0x00ffffff,
2044                 .data   = &vendor_pl080,
2045         },
2046         { 0, 0 },
2047 };
2048
2049 static struct amba_driver pl08x_amba_driver = {
2050         .drv.name       = DRIVER_NAME,
2051         .id_table       = pl08x_ids,
2052         .probe          = pl08x_probe,
2053 };
2054
2055 static int __init pl08x_init(void)
2056 {
2057         int retval;
2058         retval = amba_driver_register(&pl08x_amba_driver);
2059         if (retval)
2060                 printk(KERN_WARNING DRIVER_NAME
2061                        "failed to register as an AMBA device (%d)\n",
2062                        retval);
2063         return retval;
2064 }
2065 subsys_initcall(pl08x_init);