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-rw-r--r--drivers/dma/Kconfig8
-rw-r--r--drivers/dma/Makefile1
-rw-r--r--drivers/dma/amba-pl08x.c2167
-rw-r--r--include/linux/amba/pl08x.h222
4 files changed, 2398 insertions, 0 deletions
diff --git a/drivers/dma/Kconfig b/drivers/dma/Kconfig
index 9520cf02edc8..f82ef10a8361 100644
--- a/drivers/dma/Kconfig
+++ b/drivers/dma/Kconfig
@@ -49,6 +49,14 @@ config INTEL_MID_DMAC
49config ASYNC_TX_DISABLE_CHANNEL_SWITCH 49config ASYNC_TX_DISABLE_CHANNEL_SWITCH
50 bool 50 bool
51 51
52config AMBA_PL08X
53 bool "ARM PrimeCell PL080 or PL081 support"
54 depends on ARM_AMBA && EXPERIMENTAL
55 select DMA_ENGINE
56 help
57 Platform has a PL08x DMAC device
58 which can provide DMA engine support
59
52config INTEL_IOATDMA 60config INTEL_IOATDMA
53 tristate "Intel I/OAT DMA support" 61 tristate "Intel I/OAT DMA support"
54 depends on PCI && X86 62 depends on PCI && X86
diff --git a/drivers/dma/Makefile b/drivers/dma/Makefile
index 72bd70384d8a..0b690e7e4384 100644
--- a/drivers/dma/Makefile
+++ b/drivers/dma/Makefile
@@ -25,3 +25,4 @@ obj-$(CONFIG_TIMB_DMA) += timb_dma.o
25obj-$(CONFIG_STE_DMA40) += ste_dma40.o ste_dma40_ll.o 25obj-$(CONFIG_STE_DMA40) += ste_dma40.o ste_dma40_ll.o
26obj-$(CONFIG_PL330_DMA) += pl330.o 26obj-$(CONFIG_PL330_DMA) += pl330.o
27obj-$(CONFIG_PCH_DMA) += pch_dma.o 27obj-$(CONFIG_PCH_DMA) += pch_dma.o
28obj-$(CONFIG_AMBA_PL08X) += amba-pl08x.o
diff --git a/drivers/dma/amba-pl08x.c b/drivers/dma/amba-pl08x.c
new file mode 100644
index 000000000000..b605cc9ac3a2
--- /dev/null
+++ b/drivers/dma/amba-pl08x.c
@@ -0,0 +1,2167 @@
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 iin this distribution in the
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 *
56 * Only DMAC flow control is implemented
57 *
58 * Global TODO:
59 * - Break out common code from arch/arm/mach-s3c64xx and share
60 */
61#include <linux/device.h>
62#include <linux/init.h>
63#include <linux/module.h>
64#include <linux/pci.h>
65#include <linux/interrupt.h>
66#include <linux/slab.h>
67#include <linux/dmapool.h>
68#include <linux/amba/bus.h>
69#include <linux/dmaengine.h>
70#include <linux/amba/pl08x.h>
71#include <linux/debugfs.h>
72#include <linux/seq_file.h>
73
74#include <asm/hardware/pl080.h>
75#include <asm/dma.h>
76#include <asm/mach/dma.h>
77#include <asm/atomic.h>
78#include <asm/processor.h>
79#include <asm/cacheflush.h>
80
81#define DRIVER_NAME "pl08xdmac"
82
83/**
84 * struct vendor_data - vendor-specific config parameters
85 * for PL08x derivates
86 * @name: the name of this specific variant
87 * @channels: the number of channels available in this variant
88 * @dualmaster: whether this version supports dual AHB masters
89 * or not.
90 */
91struct vendor_data {
92 char *name;
93 u8 channels;
94 bool dualmaster;
95};
96
97/*
98 * PL08X private data structures
99 * An LLI struct - see pl08x TRM
100 * Note that next uses bit[0] as a bus bit,
101 * start & end do not - their bus bit info
102 * is in cctl
103 */
104struct lli {
105 dma_addr_t src;
106 dma_addr_t dst;
107 dma_addr_t next;
108 u32 cctl;
109};
110
111/**
112 * struct pl08x_driver_data - the local state holder for the PL08x
113 * @slave: slave engine for this instance
114 * @memcpy: memcpy engine for this instance
115 * @base: virtual memory base (remapped) for the PL08x
116 * @adev: the corresponding AMBA (PrimeCell) bus entry
117 * @vd: vendor data for this PL08x variant
118 * @pd: platform data passed in from the platform/machine
119 * @phy_chans: array of data for the physical channels
120 * @pool: a pool for the LLI descriptors
121 * @pool_ctr: counter of LLIs in the pool
122 * @lock: a spinlock for this struct
123 */
124struct pl08x_driver_data {
125 struct dma_device slave;
126 struct dma_device memcpy;
127 void __iomem *base;
128 struct amba_device *adev;
129 struct vendor_data *vd;
130 struct pl08x_platform_data *pd;
131 struct pl08x_phy_chan *phy_chans;
132 struct dma_pool *pool;
133 int pool_ctr;
134 spinlock_t lock;
135};
136
137/*
138 * PL08X specific defines
139 */
140
141/*
142 * Memory boundaries: the manual for PL08x says that the controller
143 * cannot read past a 1KiB boundary, so these defines are used to
144 * create transfer LLIs that do not cross such boundaries.
145 */
146#define PL08X_BOUNDARY_SHIFT (10) /* 1KB 0x400 */
147#define PL08X_BOUNDARY_SIZE (1 << PL08X_BOUNDARY_SHIFT)
148
149/* Minimum period between work queue runs */
150#define PL08X_WQ_PERIODMIN 20
151
152/* Size (bytes) of each LLI buffer allocated for one transfer */
153# define PL08X_LLI_TSFR_SIZE 0x2000
154
155/* Maximimum times we call dma_pool_alloc on this pool without freeing */
156#define PL08X_MAX_ALLOCS 0x40
157#define MAX_NUM_TSFR_LLIS (PL08X_LLI_TSFR_SIZE/sizeof(struct lli))
158#define PL08X_ALIGN 8
159
160static inline struct pl08x_dma_chan *to_pl08x_chan(struct dma_chan *chan)
161{
162 return container_of(chan, struct pl08x_dma_chan, chan);
163}
164
165/*
166 * Physical channel handling
167 */
168
169/* Whether a certain channel is busy or not */
170static int pl08x_phy_channel_busy(struct pl08x_phy_chan *ch)
171{
172 unsigned int val;
173
174 val = readl(ch->base + PL080_CH_CONFIG);
175 return val & PL080_CONFIG_ACTIVE;
176}
177
178/*
179 * Set the initial DMA register values i.e. those for the first LLI
180 * The next lli pointer and the configuration interrupt bit have
181 * been set when the LLIs were constructed
182 */
183static void pl08x_set_cregs(struct pl08x_driver_data *pl08x,
184 struct pl08x_phy_chan *ch)
185{
186 /* Wait for channel inactive */
187 while (pl08x_phy_channel_busy(ch))
188 ;
189
190 dev_vdbg(&pl08x->adev->dev,
191 "WRITE channel %d: csrc=%08x, cdst=%08x, "
192 "cctl=%08x, clli=%08x, ccfg=%08x\n",
193 ch->id,
194 ch->csrc,
195 ch->cdst,
196 ch->cctl,
197 ch->clli,
198 ch->ccfg);
199
200 writel(ch->csrc, ch->base + PL080_CH_SRC_ADDR);
201 writel(ch->cdst, ch->base + PL080_CH_DST_ADDR);
202 writel(ch->clli, ch->base + PL080_CH_LLI);
203 writel(ch->cctl, ch->base + PL080_CH_CONTROL);
204 writel(ch->ccfg, ch->base + PL080_CH_CONFIG);
205}
206
207static inline void pl08x_config_phychan_for_txd(struct pl08x_dma_chan *plchan)
208{
209 struct pl08x_channel_data *cd = plchan->cd;
210 struct pl08x_phy_chan *phychan = plchan->phychan;
211 struct pl08x_txd *txd = plchan->at;
212
213 /* Copy the basic control register calculated at transfer config */
214 phychan->csrc = txd->csrc;
215 phychan->cdst = txd->cdst;
216 phychan->clli = txd->clli;
217 phychan->cctl = txd->cctl;
218
219 /* Assign the signal to the proper control registers */
220 phychan->ccfg = cd->ccfg;
221 phychan->ccfg &= ~PL080_CONFIG_SRC_SEL_MASK;
222 phychan->ccfg &= ~PL080_CONFIG_DST_SEL_MASK;
223 /* If it wasn't set from AMBA, ignore it */
224 if (txd->direction == DMA_TO_DEVICE)
225 /* Select signal as destination */
226 phychan->ccfg |=
227 (phychan->signal << PL080_CONFIG_DST_SEL_SHIFT);
228 else if (txd->direction == DMA_FROM_DEVICE)
229 /* Select signal as source */
230 phychan->ccfg |=
231 (phychan->signal << PL080_CONFIG_SRC_SEL_SHIFT);
232 /* Always enable error interrupts */
233 phychan->ccfg |= PL080_CONFIG_ERR_IRQ_MASK;
234 /* Always enable terminal interrupts */
235 phychan->ccfg |= PL080_CONFIG_TC_IRQ_MASK;
236}
237
238/*
239 * Enable the DMA channel
240 * Assumes all other configuration bits have been set
241 * as desired before this code is called
242 */
243static void pl08x_enable_phy_chan(struct pl08x_driver_data *pl08x,
244 struct pl08x_phy_chan *ch)
245{
246 u32 val;
247
248 /*
249 * Do not access config register until channel shows as disabled
250 */
251 while (readl(pl08x->base + PL080_EN_CHAN) & (1 << ch->id))
252 ;
253
254 /*
255 * Do not access config register until channel shows as inactive
256 */
257 val = readl(ch->base + PL080_CH_CONFIG);
258 while ((val & PL080_CONFIG_ACTIVE) || (val & PL080_CONFIG_ENABLE))
259 val = readl(ch->base + PL080_CH_CONFIG);
260
261 writel(val | PL080_CONFIG_ENABLE, ch->base + PL080_CH_CONFIG);
262}
263
264/*
265 * Overall DMAC remains enabled always.
266 *
267 * Disabling individual channels could lose data.
268 *
269 * Disable the peripheral DMA after disabling the DMAC
270 * in order to allow the DMAC FIFO to drain, and
271 * hence allow the channel to show inactive
272 *
273 */
274static void pl08x_pause_phy_chan(struct pl08x_phy_chan *ch)
275{
276 u32 val;
277
278 /* Set the HALT bit and wait for the FIFO to drain */
279 val = readl(ch->base + PL080_CH_CONFIG);
280 val |= PL080_CONFIG_HALT;
281 writel(val, ch->base + PL080_CH_CONFIG);
282
283 /* Wait for channel inactive */
284 while (pl08x_phy_channel_busy(ch))
285 ;
286}
287
288static void pl08x_resume_phy_chan(struct pl08x_phy_chan *ch)
289{
290 u32 val;
291
292 /* Clear the HALT bit */
293 val = readl(ch->base + PL080_CH_CONFIG);
294 val &= ~PL080_CONFIG_HALT;
295 writel(val, ch->base + PL080_CH_CONFIG);
296}
297
298
299/* Stops the channel */
300static void pl08x_stop_phy_chan(struct pl08x_phy_chan *ch)
301{
302 u32 val;
303
304 pl08x_pause_phy_chan(ch);
305
306 /* Disable channel */
307 val = readl(ch->base + PL080_CH_CONFIG);
308 val &= ~PL080_CONFIG_ENABLE;
309 val &= ~PL080_CONFIG_ERR_IRQ_MASK;
310 val &= ~PL080_CONFIG_TC_IRQ_MASK;
311 writel(val, ch->base + PL080_CH_CONFIG);
312}
313
314static inline u32 get_bytes_in_cctl(u32 cctl)
315{
316 /* The source width defines the number of bytes */
317 u32 bytes = cctl & PL080_CONTROL_TRANSFER_SIZE_MASK;
318
319 switch (cctl >> PL080_CONTROL_SWIDTH_SHIFT) {
320 case PL080_WIDTH_8BIT:
321 break;
322 case PL080_WIDTH_16BIT:
323 bytes *= 2;
324 break;
325 case PL080_WIDTH_32BIT:
326 bytes *= 4;
327 break;
328 }
329 return bytes;
330}
331
332/* The channel should be paused when calling this */
333static u32 pl08x_getbytes_chan(struct pl08x_dma_chan *plchan)
334{
335 struct pl08x_phy_chan *ch;
336 struct pl08x_txd *txdi = NULL;
337 struct pl08x_txd *txd;
338 unsigned long flags;
339 u32 bytes = 0;
340
341 spin_lock_irqsave(&plchan->lock, flags);
342
343 ch = plchan->phychan;
344 txd = plchan->at;
345
346 /*
347 * Next follow the LLIs to get the number of pending bytes in the
348 * currently active transaction.
349 */
350 if (ch && txd) {
351 struct lli *llis_va = txd->llis_va;
352 struct lli *llis_bus = (struct lli *) txd->llis_bus;
353 u32 clli = readl(ch->base + PL080_CH_LLI);
354
355 /* First get the bytes in the current active LLI */
356 bytes = get_bytes_in_cctl(readl(ch->base + PL080_CH_CONTROL));
357
358 if (clli) {
359 int i = 0;
360
361 /* Forward to the LLI pointed to by clli */
362 while ((clli != (u32) &(llis_bus[i])) &&
363 (i < MAX_NUM_TSFR_LLIS))
364 i++;
365
366 while (clli) {
367 bytes += get_bytes_in_cctl(llis_va[i].cctl);
368 /*
369 * A clli of 0x00000000 will terminate the
370 * LLI list
371 */
372 clli = llis_va[i].next;
373 i++;
374 }
375 }
376 }
377
378 /* Sum up all queued transactions */
379 if (!list_empty(&plchan->desc_list)) {
380 list_for_each_entry(txdi, &plchan->desc_list, node) {
381 bytes += txdi->len;
382 }
383
384 }
385
386 spin_unlock_irqrestore(&plchan->lock, flags);
387
388 return bytes;
389}
390
391/*
392 * Allocate a physical channel for a virtual channel
393 */
394static struct pl08x_phy_chan *
395pl08x_get_phy_channel(struct pl08x_driver_data *pl08x,
396 struct pl08x_dma_chan *virt_chan)
397{
398 struct pl08x_phy_chan *ch = NULL;
399 unsigned long flags;
400 int i;
401
402 /*
403 * Try to locate a physical channel to be used for
404 * this transfer. If all are taken return NULL and
405 * the requester will have to cope by using some fallback
406 * PIO mode or retrying later.
407 */
408 for (i = 0; i < pl08x->vd->channels; i++) {
409 ch = &pl08x->phy_chans[i];
410
411 spin_lock_irqsave(&ch->lock, flags);
412
413 if (!ch->serving) {
414 ch->serving = virt_chan;
415 ch->signal = -1;
416 spin_unlock_irqrestore(&ch->lock, flags);
417 break;
418 }
419
420 spin_unlock_irqrestore(&ch->lock, flags);
421 }
422
423 if (i == pl08x->vd->channels) {
424 /* No physical channel available, cope with it */
425 return NULL;
426 }
427
428 return ch;
429}
430
431static inline void pl08x_put_phy_channel(struct pl08x_driver_data *pl08x,
432 struct pl08x_phy_chan *ch)
433{
434 unsigned long flags;
435
436 /* Stop the channel and clear its interrupts */
437 pl08x_stop_phy_chan(ch);
438 writel((1 << ch->id), pl08x->base + PL080_ERR_CLEAR);
439 writel((1 << ch->id), pl08x->base + PL080_TC_CLEAR);
440
441 /* Mark it as free */
442 spin_lock_irqsave(&ch->lock, flags);
443 ch->serving = NULL;
444 spin_unlock_irqrestore(&ch->lock, flags);
445}
446
447/*
448 * LLI handling
449 */
450
451static inline unsigned int pl08x_get_bytes_for_cctl(unsigned int coded)
452{
453 switch (coded) {
454 case PL080_WIDTH_8BIT:
455 return 1;
456 case PL080_WIDTH_16BIT:
457 return 2;
458 case PL080_WIDTH_32BIT:
459 return 4;
460 default:
461 break;
462 }
463 BUG();
464 return 0;
465}
466
467static inline u32 pl08x_cctl_bits(u32 cctl, u8 srcwidth, u8 dstwidth,
468 u32 tsize)
469{
470 u32 retbits = cctl;
471
472 /* Remove all src, dst and transfersize bits */
473 retbits &= ~PL080_CONTROL_DWIDTH_MASK;
474 retbits &= ~PL080_CONTROL_SWIDTH_MASK;
475 retbits &= ~PL080_CONTROL_TRANSFER_SIZE_MASK;
476
477 /* Then set the bits according to the parameters */
478 switch (srcwidth) {
479 case 1:
480 retbits |= PL080_WIDTH_8BIT << PL080_CONTROL_SWIDTH_SHIFT;
481 break;
482 case 2:
483 retbits |= PL080_WIDTH_16BIT << PL080_CONTROL_SWIDTH_SHIFT;
484 break;
485 case 4:
486 retbits |= PL080_WIDTH_32BIT << PL080_CONTROL_SWIDTH_SHIFT;
487 break;
488 default:
489 BUG();
490 break;
491 }
492
493 switch (dstwidth) {
494 case 1:
495 retbits |= PL080_WIDTH_8BIT << PL080_CONTROL_DWIDTH_SHIFT;
496 break;
497 case 2:
498 retbits |= PL080_WIDTH_16BIT << PL080_CONTROL_DWIDTH_SHIFT;
499 break;
500 case 4:
501 retbits |= PL080_WIDTH_32BIT << PL080_CONTROL_DWIDTH_SHIFT;
502 break;
503 default:
504 BUG();
505 break;
506 }
507
508 retbits |= tsize << PL080_CONTROL_TRANSFER_SIZE_SHIFT;
509 return retbits;
510}
511
512/*
513 * Autoselect a master bus to use for the transfer
514 * this prefers the destination bus if both available
515 * if fixed address on one bus the other will be chosen
516 */
517void pl08x_choose_master_bus(struct pl08x_bus_data *src_bus,
518 struct pl08x_bus_data *dst_bus, struct pl08x_bus_data **mbus,
519 struct pl08x_bus_data **sbus, u32 cctl)
520{
521 if (!(cctl & PL080_CONTROL_DST_INCR)) {
522 *mbus = src_bus;
523 *sbus = dst_bus;
524 } else if (!(cctl & PL080_CONTROL_SRC_INCR)) {
525 *mbus = dst_bus;
526 *sbus = src_bus;
527 } else {
528 if (dst_bus->buswidth == 4) {
529 *mbus = dst_bus;
530 *sbus = src_bus;
531 } else if (src_bus->buswidth == 4) {
532 *mbus = src_bus;
533 *sbus = dst_bus;
534 } else if (dst_bus->buswidth == 2) {
535 *mbus = dst_bus;
536 *sbus = src_bus;
537 } else if (src_bus->buswidth == 2) {
538 *mbus = src_bus;
539 *sbus = dst_bus;
540 } else {
541 /* src_bus->buswidth == 1 */
542 *mbus = dst_bus;
543 *sbus = src_bus;
544 }
545 }
546}
547
548/*
549 * Fills in one LLI for a certain transfer descriptor
550 * and advance the counter
551 */
552int pl08x_fill_lli_for_desc(struct pl08x_driver_data *pl08x,
553 struct pl08x_txd *txd, int num_llis, int len,
554 u32 cctl, u32 *remainder)
555{
556 struct lli *llis_va = txd->llis_va;
557 struct lli *llis_bus = (struct lli *) txd->llis_bus;
558
559 BUG_ON(num_llis >= MAX_NUM_TSFR_LLIS);
560
561 llis_va[num_llis].cctl = cctl;
562 llis_va[num_llis].src = txd->srcbus.addr;
563 llis_va[num_llis].dst = txd->dstbus.addr;
564
565 /*
566 * On versions with dual masters, you can optionally AND on
567 * PL080_LLI_LM_AHB2 to the LLI to tell the hardware to read
568 * in new LLIs with that controller, but we always try to
569 * choose AHB1 to point into memory. The idea is to have AHB2
570 * fixed on the peripheral and AHB1 messing around in the
571 * memory. So we don't manipulate this bit currently.
572 */
573
574 llis_va[num_llis].next =
575 (dma_addr_t)((u32) &(llis_bus[num_llis + 1]));
576
577 if (cctl & PL080_CONTROL_SRC_INCR)
578 txd->srcbus.addr += len;
579 if (cctl & PL080_CONTROL_DST_INCR)
580 txd->dstbus.addr += len;
581
582 *remainder -= len;
583
584 return num_llis + 1;
585}
586
587/*
588 * Return number of bytes to fill to boundary, or len
589 */
590static inline u32 pl08x_pre_boundary(u32 addr, u32 len)
591{
592 u32 boundary;
593
594 boundary = ((addr >> PL08X_BOUNDARY_SHIFT) + 1)
595 << PL08X_BOUNDARY_SHIFT;
596
597 if (boundary < addr + len)
598 return boundary - addr;
599 else
600 return len;
601}
602
603/*
604 * This fills in the table of LLIs for the transfer descriptor
605 * Note that we assume we never have to change the burst sizes
606 * Return 0 for error
607 */
608static int pl08x_fill_llis_for_desc(struct pl08x_driver_data *pl08x,
609 struct pl08x_txd *txd)
610{
611 struct pl08x_channel_data *cd = txd->cd;
612 struct pl08x_bus_data *mbus, *sbus;
613 u32 remainder;
614 int num_llis = 0;
615 u32 cctl;
616 int max_bytes_per_lli;
617 int total_bytes = 0;
618 struct lli *llis_va;
619 struct lli *llis_bus;
620
621 if (!txd) {
622 dev_err(&pl08x->adev->dev, "%s no descriptor\n", __func__);
623 return 0;
624 }
625
626 txd->llis_va = dma_pool_alloc(pl08x->pool, GFP_NOWAIT,
627 &txd->llis_bus);
628 if (!txd->llis_va) {
629 dev_err(&pl08x->adev->dev, "%s no memory for llis\n", __func__);
630 return 0;
631 }
632
633 pl08x->pool_ctr++;
634
635 /*
636 * Initialize bus values for this transfer
637 * from the passed optimal values
638 */
639 if (!cd) {
640 dev_err(&pl08x->adev->dev, "%s no channel data\n", __func__);
641 return 0;
642 }
643
644 /* Get the default CCTL from the platform data */
645 cctl = cd->cctl;
646
647 /*
648 * On the PL080 we have two bus masters and we
649 * should select one for source and one for
650 * destination. We try to use AHB2 for the
651 * bus which does not increment (typically the
652 * peripheral) else we just choose something.
653 */
654 cctl &= ~(PL080_CONTROL_DST_AHB2 | PL080_CONTROL_SRC_AHB2);
655 if (pl08x->vd->dualmaster) {
656 if (cctl & PL080_CONTROL_SRC_INCR)
657 /* Source increments, use AHB2 for destination */
658 cctl |= PL080_CONTROL_DST_AHB2;
659 else if (cctl & PL080_CONTROL_DST_INCR)
660 /* Destination increments, use AHB2 for source */
661 cctl |= PL080_CONTROL_SRC_AHB2;
662 else
663 /* Just pick something, source AHB1 dest AHB2 */
664 cctl |= PL080_CONTROL_DST_AHB2;
665 }
666
667 /* Find maximum width of the source bus */
668 txd->srcbus.maxwidth =
669 pl08x_get_bytes_for_cctl((cctl & PL080_CONTROL_SWIDTH_MASK) >>
670 PL080_CONTROL_SWIDTH_SHIFT);
671
672 /* Find maximum width of the destination bus */
673 txd->dstbus.maxwidth =
674 pl08x_get_bytes_for_cctl((cctl & PL080_CONTROL_DWIDTH_MASK) >>
675 PL080_CONTROL_DWIDTH_SHIFT);
676
677 /* Set up the bus widths to the maximum */
678 txd->srcbus.buswidth = txd->srcbus.maxwidth;
679 txd->dstbus.buswidth = txd->dstbus.maxwidth;
680 dev_vdbg(&pl08x->adev->dev,
681 "%s source bus is %d bytes wide, dest bus is %d bytes wide\n",
682 __func__, txd->srcbus.buswidth, txd->dstbus.buswidth);
683
684
685 /*
686 * Bytes transferred == tsize * MIN(buswidths), not max(buswidths)
687 */
688 max_bytes_per_lli = min(txd->srcbus.buswidth, txd->dstbus.buswidth) *
689 PL080_CONTROL_TRANSFER_SIZE_MASK;
690 dev_vdbg(&pl08x->adev->dev,
691 "%s max bytes per lli = %d\n",
692 __func__, max_bytes_per_lli);
693
694 /* We need to count this down to zero */
695 remainder = txd->len;
696 dev_vdbg(&pl08x->adev->dev,
697 "%s remainder = %d\n",
698 __func__, remainder);
699
700 /*
701 * Choose bus to align to
702 * - prefers destination bus if both available
703 * - if fixed address on one bus chooses other
704 * - modifies cctl to choose an apropriate master
705 */
706 pl08x_choose_master_bus(&txd->srcbus, &txd->dstbus,
707 &mbus, &sbus, cctl);
708
709
710 /*
711 * The lowest bit of the LLI register
712 * is also used to indicate which master to
713 * use for reading the LLIs.
714 */
715
716 if (txd->len < mbus->buswidth) {
717 /*
718 * Less than a bus width available
719 * - send as single bytes
720 */
721 while (remainder) {
722 dev_vdbg(&pl08x->adev->dev,
723 "%s single byte LLIs for a transfer of "
724 "less than a bus width (remain %08x)\n",
725 __func__, remainder);
726 cctl = pl08x_cctl_bits(cctl, 1, 1, 1);
727 num_llis =
728 pl08x_fill_lli_for_desc(pl08x, txd, num_llis, 1,
729 cctl, &remainder);
730 total_bytes++;
731 }
732 } else {
733 /*
734 * Make one byte LLIs until master bus is aligned
735 * - slave will then be aligned also
736 */
737 while ((mbus->addr) % (mbus->buswidth)) {
738 dev_vdbg(&pl08x->adev->dev,
739 "%s adjustment lli for less than bus width "
740 "(remain %08x)\n",
741 __func__, remainder);
742 cctl = pl08x_cctl_bits(cctl, 1, 1, 1);
743 num_llis = pl08x_fill_lli_for_desc
744 (pl08x, txd, num_llis, 1, cctl, &remainder);
745 total_bytes++;
746 }
747
748 /*
749 * Master now aligned
750 * - if slave is not then we must set its width down
751 */
752 if (sbus->addr % sbus->buswidth) {
753 dev_dbg(&pl08x->adev->dev,
754 "%s set down bus width to one byte\n",
755 __func__);
756
757 sbus->buswidth = 1;
758 }
759
760 /*
761 * Make largest possible LLIs until less than one bus
762 * width left
763 */
764 while (remainder > (mbus->buswidth - 1)) {
765 int lli_len, target_len;
766 int tsize;
767 int odd_bytes;
768
769 /*
770 * If enough left try to send max possible,
771 * otherwise try to send the remainder
772 */
773 target_len = remainder;
774 if (remainder > max_bytes_per_lli)
775 target_len = max_bytes_per_lli;
776
777 /*
778 * Set bus lengths for incrementing busses
779 * to number of bytes which fill to next memory
780 * boundary
781 */
782 if (cctl & PL080_CONTROL_SRC_INCR)
783 txd->srcbus.fill_bytes =
784 pl08x_pre_boundary(
785 txd->srcbus.addr,
786 remainder);
787 else
788 txd->srcbus.fill_bytes =
789 max_bytes_per_lli;
790
791 if (cctl & PL080_CONTROL_DST_INCR)
792 txd->dstbus.fill_bytes =
793 pl08x_pre_boundary(
794 txd->dstbus.addr,
795 remainder);
796 else
797 txd->dstbus.fill_bytes =
798 max_bytes_per_lli;
799
800 /*
801 * Find the nearest
802 */
803 lli_len = min(txd->srcbus.fill_bytes,
804 txd->dstbus.fill_bytes);
805
806 BUG_ON(lli_len > remainder);
807
808 if (lli_len <= 0) {
809 dev_err(&pl08x->adev->dev,
810 "%s lli_len is %d, <= 0\n",
811 __func__, lli_len);
812 return 0;
813 }
814
815 if (lli_len == target_len) {
816 /*
817 * Can send what we wanted
818 */
819 /*
820 * Maintain alignment
821 */
822 lli_len = (lli_len/mbus->buswidth) *
823 mbus->buswidth;
824 odd_bytes = 0;
825 } else {
826 /*
827 * So now we know how many bytes to transfer
828 * to get to the nearest boundary
829 * The next lli will past the boundary
830 * - however we may be working to a boundary
831 * on the slave bus
832 * We need to ensure the master stays aligned
833 */
834 odd_bytes = lli_len % mbus->buswidth;
835 /*
836 * - and that we are working in multiples
837 * of the bus widths
838 */
839 lli_len -= odd_bytes;
840
841 }
842
843 if (lli_len) {
844 /*
845 * Check against minimum bus alignment:
846 * Calculate actual transfer size in relation
847 * to bus width an get a maximum remainder of
848 * the smallest bus width - 1
849 */
850 /* FIXME: use round_down()? */
851 tsize = lli_len / min(mbus->buswidth,
852 sbus->buswidth);
853 lli_len = tsize * min(mbus->buswidth,
854 sbus->buswidth);
855
856 if (target_len != lli_len) {
857 dev_vdbg(&pl08x->adev->dev,
858 "%s can't send what we want. Desired %08x, lli of %08x bytes in txd of %08x\n",
859 __func__, target_len, lli_len, txd->len);
860 }
861
862 cctl = pl08x_cctl_bits(cctl,
863 txd->srcbus.buswidth,
864 txd->dstbus.buswidth,
865 tsize);
866
867 dev_vdbg(&pl08x->adev->dev,
868 "%s fill lli with single lli chunk of size %08x (remainder %08x)\n",
869 __func__, lli_len, remainder);
870 num_llis = pl08x_fill_lli_for_desc(pl08x, txd,
871 num_llis, lli_len, cctl,
872 &remainder);
873 total_bytes += lli_len;
874 }
875
876
877 if (odd_bytes) {
878 /*
879 * Creep past the boundary,
880 * maintaining master alignment
881 */
882 int j;
883 for (j = 0; (j < mbus->buswidth)
884 && (remainder); j++) {
885 cctl = pl08x_cctl_bits(cctl, 1, 1, 1);
886 dev_vdbg(&pl08x->adev->dev,
887 "%s align with boundardy, single byte (remain %08x)\n",
888 __func__, remainder);
889 num_llis =
890 pl08x_fill_lli_for_desc(pl08x,
891 txd, num_llis, 1,
892 cctl, &remainder);
893 total_bytes++;
894 }
895 }
896 }
897
898 /*
899 * Send any odd bytes
900 */
901 if (remainder < 0) {
902 dev_err(&pl08x->adev->dev, "%s remainder not fitted 0x%08x bytes\n",
903 __func__, remainder);
904 return 0;
905 }
906
907 while (remainder) {
908 cctl = pl08x_cctl_bits(cctl, 1, 1, 1);
909 dev_vdbg(&pl08x->adev->dev,
910 "%s align with boundardy, single odd byte (remain %d)\n",
911 __func__, remainder);
912 num_llis = pl08x_fill_lli_for_desc(pl08x, txd, num_llis,
913 1, cctl, &remainder);
914 total_bytes++;
915 }
916 }
917 if (total_bytes != txd->len) {
918 dev_err(&pl08x->adev->dev,
919 "%s size of encoded lli:s don't match total txd, transferred 0x%08x from size 0x%08x\n",
920 __func__, total_bytes, txd->len);
921 return 0;
922 }
923
924 if (num_llis >= MAX_NUM_TSFR_LLIS) {
925 dev_err(&pl08x->adev->dev,
926 "%s need to increase MAX_NUM_TSFR_LLIS from 0x%08x\n",
927 __func__, (u32) MAX_NUM_TSFR_LLIS);
928 return 0;
929 }
930 /*
931 * Decide whether this is a loop or a terminated transfer
932 */
933 llis_va = txd->llis_va;
934 llis_bus = (struct lli *) txd->llis_bus;
935
936 if (cd->circular_buffer) {
937 /*
938 * Loop the circular buffer so that the next element
939 * points back to the beginning of the LLI.
940 */
941 llis_va[num_llis - 1].next =
942 (dma_addr_t)((unsigned int)&(llis_bus[0]));
943 } else {
944 /*
945 * On non-circular buffers, the final LLI terminates
946 * the LLI.
947 */
948 llis_va[num_llis - 1].next = 0;
949 /*
950 * The final LLI element shall also fire an interrupt
951 */
952 llis_va[num_llis - 1].cctl |= PL080_CONTROL_TC_IRQ_EN;
953 }
954
955 /* Now store the channel register values */
956 txd->csrc = llis_va[0].src;
957 txd->cdst = llis_va[0].dst;
958 if (num_llis > 1)
959 txd->clli = llis_va[0].next;
960 else
961 txd->clli = 0;
962
963 txd->cctl = llis_va[0].cctl;
964 /* ccfg will be set at physical channel allocation time */
965
966#ifdef VERBOSE_DEBUG
967 {
968 int i;
969
970 for (i = 0; i < num_llis; i++) {
971 dev_vdbg(&pl08x->adev->dev,
972 "lli %d @%p: csrc=%08x, cdst=%08x, cctl=%08x, clli=%08x\n",
973 i,
974 &llis_va[i],
975 llis_va[i].src,
976 llis_va[i].dst,
977 llis_va[i].cctl,
978 llis_va[i].next
979 );
980 }
981 }
982#endif
983
984 return num_llis;
985}
986
987/* You should call this with the struct pl08x lock held */
988static void pl08x_free_txd(struct pl08x_driver_data *pl08x,
989 struct pl08x_txd *txd)
990{
991 if (!txd)
992 dev_err(&pl08x->adev->dev,
993 "%s no descriptor to free\n",
994 __func__);
995
996 /* Free the LLI */
997 dma_pool_free(pl08x->pool, txd->llis_va,
998 txd->llis_bus);
999
1000 pl08x->pool_ctr--;
1001
1002 kfree(txd);
1003}
1004
1005static void pl08x_free_txd_list(struct pl08x_driver_data *pl08x,
1006 struct pl08x_dma_chan *plchan)
1007{
1008 struct pl08x_txd *txdi = NULL;
1009 struct pl08x_txd *next;
1010
1011 if (!list_empty(&plchan->desc_list)) {
1012 list_for_each_entry_safe(txdi,
1013 next, &plchan->desc_list, node) {
1014 list_del(&txdi->node);
1015 pl08x_free_txd(pl08x, txdi);
1016 }
1017
1018 }
1019}
1020
1021/*
1022 * The DMA ENGINE API
1023 */
1024static int pl08x_alloc_chan_resources(struct dma_chan *chan)
1025{
1026 return 0;
1027}
1028
1029static void pl08x_free_chan_resources(struct dma_chan *chan)
1030{
1031}
1032
1033/*
1034 * This should be called with the channel plchan->lock held
1035 */
1036static int prep_phy_channel(struct pl08x_dma_chan *plchan,
1037 struct pl08x_txd *txd)
1038{
1039 struct pl08x_driver_data *pl08x = plchan->host;
1040 struct pl08x_phy_chan *ch;
1041 int ret;
1042
1043 /* Check if we already have a channel */
1044 if (plchan->phychan)
1045 return 0;
1046
1047 ch = pl08x_get_phy_channel(pl08x, plchan);
1048 if (!ch) {
1049 /* No physical channel available, cope with it */
1050 dev_dbg(&pl08x->adev->dev, "no physical channel available for xfer on %s\n", plchan->name);
1051 return -EBUSY;
1052 }
1053
1054 /*
1055 * OK we have a physical channel: for memcpy() this is all we
1056 * need, but for slaves the physical signals may be muxed!
1057 * Can the platform allow us to use this channel?
1058 */
1059 if (plchan->slave &&
1060 ch->signal < 0 &&
1061 pl08x->pd->get_signal) {
1062 ret = pl08x->pd->get_signal(plchan);
1063 if (ret < 0) {
1064 dev_dbg(&pl08x->adev->dev,
1065 "unable to use physical channel %d for transfer on %s due to platform restrictions\n",
1066 ch->id, plchan->name);
1067 /* Release physical channel & return */
1068 pl08x_put_phy_channel(pl08x, ch);
1069 return -EBUSY;
1070 }
1071 ch->signal = ret;
1072 }
1073
1074 dev_dbg(&pl08x->adev->dev, "allocated physical channel %d and signal %d for xfer on %s\n",
1075 ch->id,
1076 ch->signal,
1077 plchan->name);
1078
1079 plchan->phychan = ch;
1080
1081 return 0;
1082}
1083
1084static dma_cookie_t pl08x_tx_submit(struct dma_async_tx_descriptor *tx)
1085{
1086 struct pl08x_dma_chan *plchan = to_pl08x_chan(tx->chan);
1087
1088 atomic_inc(&plchan->last_issued);
1089 tx->cookie = atomic_read(&plchan->last_issued);
1090 /* This unlock follows the lock in the prep() function */
1091 spin_unlock_irqrestore(&plchan->lock, plchan->lockflags);
1092
1093 return tx->cookie;
1094}
1095
1096static struct dma_async_tx_descriptor *pl08x_prep_dma_interrupt(
1097 struct dma_chan *chan, unsigned long flags)
1098{
1099 struct dma_async_tx_descriptor *retval = NULL;
1100
1101 return retval;
1102}
1103
1104/*
1105 * Code accessing dma_async_is_complete() in a tight loop
1106 * may give problems - could schedule where indicated.
1107 * If slaves are relying on interrupts to signal completion this
1108 * function must not be called with interrupts disabled
1109 */
1110static enum dma_status
1111pl08x_dma_tx_status(struct dma_chan *chan,
1112 dma_cookie_t cookie,
1113 struct dma_tx_state *txstate)
1114{
1115 struct pl08x_dma_chan *plchan = to_pl08x_chan(chan);
1116 dma_cookie_t last_used;
1117 dma_cookie_t last_complete;
1118 enum dma_status ret;
1119 u32 bytesleft = 0;
1120
1121 last_used = atomic_read(&plchan->last_issued);
1122 last_complete = plchan->lc;
1123
1124 ret = dma_async_is_complete(cookie, last_complete, last_used);
1125 if (ret == DMA_SUCCESS) {
1126 dma_set_tx_state(txstate, last_complete, last_used, 0);
1127 return ret;
1128 }
1129
1130 /*
1131 * schedule(); could be inserted here
1132 */
1133
1134 /*
1135 * This cookie not complete yet
1136 */
1137 last_used = atomic_read(&plchan->last_issued);
1138 last_complete = plchan->lc;
1139
1140 /* Get number of bytes left in the active transactions and queue */
1141 bytesleft = pl08x_getbytes_chan(plchan);
1142
1143 dma_set_tx_state(txstate, last_complete, last_used,
1144 bytesleft);
1145
1146 if (plchan->state == PL08X_CHAN_PAUSED)
1147 return DMA_PAUSED;
1148
1149 /* Whether waiting or running, we're in progress */
1150 return DMA_IN_PROGRESS;
1151}
1152
1153/* PrimeCell DMA extension */
1154struct burst_table {
1155 int burstwords;
1156 u32 reg;
1157};
1158
1159static const struct burst_table burst_sizes[] = {
1160 {
1161 .burstwords = 256,
1162 .reg = (PL080_BSIZE_256 << PL080_CONTROL_SB_SIZE_SHIFT) |
1163 (PL080_BSIZE_256 << PL080_CONTROL_DB_SIZE_SHIFT),
1164 },
1165 {
1166 .burstwords = 128,
1167 .reg = (PL080_BSIZE_128 << PL080_CONTROL_SB_SIZE_SHIFT) |
1168 (PL080_BSIZE_128 << PL080_CONTROL_DB_SIZE_SHIFT),
1169 },
1170 {
1171 .burstwords = 64,
1172 .reg = (PL080_BSIZE_64 << PL080_CONTROL_SB_SIZE_SHIFT) |
1173 (PL080_BSIZE_64 << PL080_CONTROL_DB_SIZE_SHIFT),
1174 },
1175 {
1176 .burstwords = 32,
1177 .reg = (PL080_BSIZE_32 << PL080_CONTROL_SB_SIZE_SHIFT) |
1178 (PL080_BSIZE_32 << PL080_CONTROL_DB_SIZE_SHIFT),
1179 },
1180 {
1181 .burstwords = 16,
1182 .reg = (PL080_BSIZE_16 << PL080_CONTROL_SB_SIZE_SHIFT) |
1183 (PL080_BSIZE_16 << PL080_CONTROL_DB_SIZE_SHIFT),
1184 },
1185 {
1186 .burstwords = 8,
1187 .reg = (PL080_BSIZE_8 << PL080_CONTROL_SB_SIZE_SHIFT) |
1188 (PL080_BSIZE_8 << PL080_CONTROL_DB_SIZE_SHIFT),
1189 },
1190 {
1191 .burstwords = 4,
1192 .reg = (PL080_BSIZE_4 << PL080_CONTROL_SB_SIZE_SHIFT) |
1193 (PL080_BSIZE_4 << PL080_CONTROL_DB_SIZE_SHIFT),
1194 },
1195 {
1196 .burstwords = 1,
1197 .reg = (PL080_BSIZE_1 << PL080_CONTROL_SB_SIZE_SHIFT) |
1198 (PL080_BSIZE_1 << PL080_CONTROL_DB_SIZE_SHIFT),
1199 },
1200};
1201
1202static void dma_set_runtime_config(struct dma_chan *chan,
1203 struct dma_slave_config *config)
1204{
1205 struct pl08x_dma_chan *plchan = to_pl08x_chan(chan);
1206 struct pl08x_driver_data *pl08x = plchan->host;
1207 struct pl08x_channel_data *cd = plchan->cd;
1208 enum dma_slave_buswidth addr_width;
1209 u32 maxburst;
1210 u32 cctl = 0;
1211 /* Mask out all except src and dst channel */
1212 u32 ccfg = cd->ccfg & 0x000003DEU;
1213 int i = 0;
1214
1215 /* Transfer direction */
1216 plchan->runtime_direction = config->direction;
1217 if (config->direction == DMA_TO_DEVICE) {
1218 plchan->runtime_addr = config->dst_addr;
1219 cctl |= PL080_CONTROL_SRC_INCR;
1220 ccfg |= PL080_FLOW_MEM2PER << PL080_CONFIG_FLOW_CONTROL_SHIFT;
1221 addr_width = config->dst_addr_width;
1222 maxburst = config->dst_maxburst;
1223 } else if (config->direction == DMA_FROM_DEVICE) {
1224 plchan->runtime_addr = config->src_addr;
1225 cctl |= PL080_CONTROL_DST_INCR;
1226 ccfg |= PL080_FLOW_PER2MEM << PL080_CONFIG_FLOW_CONTROL_SHIFT;
1227 addr_width = config->src_addr_width;
1228 maxburst = config->src_maxburst;
1229 } else {
1230 dev_err(&pl08x->adev->dev,
1231 "bad runtime_config: alien transfer direction\n");
1232 return;
1233 }
1234
1235 switch (addr_width) {
1236 case DMA_SLAVE_BUSWIDTH_1_BYTE:
1237 cctl |= (PL080_WIDTH_8BIT << PL080_CONTROL_SWIDTH_SHIFT) |
1238 (PL080_WIDTH_8BIT << PL080_CONTROL_DWIDTH_SHIFT);
1239 break;
1240 case DMA_SLAVE_BUSWIDTH_2_BYTES:
1241 cctl |= (PL080_WIDTH_16BIT << PL080_CONTROL_SWIDTH_SHIFT) |
1242 (PL080_WIDTH_16BIT << PL080_CONTROL_DWIDTH_SHIFT);
1243 break;
1244 case DMA_SLAVE_BUSWIDTH_4_BYTES:
1245 cctl |= (PL080_WIDTH_32BIT << PL080_CONTROL_SWIDTH_SHIFT) |
1246 (PL080_WIDTH_32BIT << PL080_CONTROL_DWIDTH_SHIFT);
1247 break;
1248 default:
1249 dev_err(&pl08x->adev->dev,
1250 "bad runtime_config: alien address width\n");
1251 return;
1252 }
1253
1254 /*
1255 * Now decide on a maxburst:
1256 * If this channel will only request single transfers, set
1257 * this down to ONE element.
1258 */
1259 if (plchan->cd->single) {
1260 cctl |= (PL080_BSIZE_1 << PL080_CONTROL_SB_SIZE_SHIFT) |
1261 (PL080_BSIZE_1 << PL080_CONTROL_DB_SIZE_SHIFT);
1262 } else {
1263 while (i < ARRAY_SIZE(burst_sizes)) {
1264 if (burst_sizes[i].burstwords <= maxburst)
1265 break;
1266 i++;
1267 }
1268 cctl |= burst_sizes[i].reg;
1269 }
1270
1271 /* Access the cell in privileged mode, non-bufferable, non-cacheable */
1272 cctl &= ~PL080_CONTROL_PROT_MASK;
1273 cctl |= PL080_CONTROL_PROT_SYS;
1274
1275 /* Modify the default channel data to fit PrimeCell request */
1276 cd->cctl = cctl;
1277 cd->ccfg = ccfg;
1278
1279 dev_dbg(&pl08x->adev->dev,
1280 "configured channel %s (%s) for %s, data width %d, "
1281 "maxburst %d words, LE, CCTL=%08x, CCFG=%08x\n",
1282 dma_chan_name(chan), plchan->name,
1283 (config->direction == DMA_FROM_DEVICE) ? "RX" : "TX",
1284 addr_width,
1285 maxburst,
1286 cctl, ccfg);
1287}
1288
1289/*
1290 * Slave transactions callback to the slave device to allow
1291 * synchronization of slave DMA signals with the DMAC enable
1292 */
1293static void pl08x_issue_pending(struct dma_chan *chan)
1294{
1295 struct pl08x_dma_chan *plchan = to_pl08x_chan(chan);
1296 struct pl08x_driver_data *pl08x = plchan->host;
1297 unsigned long flags;
1298
1299 spin_lock_irqsave(&plchan->lock, flags);
1300 /* Something is already active */
1301 if (plchan->at) {
1302 spin_unlock_irqrestore(&plchan->lock, flags);
1303 return;
1304 }
1305
1306 /* Didn't get a physical channel so waiting for it ... */
1307 if (plchan->state == PL08X_CHAN_WAITING)
1308 return;
1309
1310 /* Take the first element in the queue and execute it */
1311 if (!list_empty(&plchan->desc_list)) {
1312 struct pl08x_txd *next;
1313
1314 next = list_first_entry(&plchan->desc_list,
1315 struct pl08x_txd,
1316 node);
1317 list_del(&next->node);
1318 plchan->at = next;
1319 plchan->state = PL08X_CHAN_RUNNING;
1320
1321 /* Configure the physical channel for the active txd */
1322 pl08x_config_phychan_for_txd(plchan);
1323 pl08x_set_cregs(pl08x, plchan->phychan);
1324 pl08x_enable_phy_chan(pl08x, plchan->phychan);
1325 }
1326
1327 spin_unlock_irqrestore(&plchan->lock, flags);
1328}
1329
1330static int pl08x_prep_channel_resources(struct pl08x_dma_chan *plchan,
1331 struct pl08x_txd *txd)
1332{
1333 int num_llis;
1334 struct pl08x_driver_data *pl08x = plchan->host;
1335 int ret;
1336
1337 num_llis = pl08x_fill_llis_for_desc(pl08x, txd);
1338
1339 if (!num_llis)
1340 return -EINVAL;
1341
1342 spin_lock_irqsave(&plchan->lock, plchan->lockflags);
1343
1344 /*
1345 * If this device is not using a circular buffer then
1346 * queue this new descriptor for transfer.
1347 * The descriptor for a circular buffer continues
1348 * to be used until the channel is freed.
1349 */
1350 if (txd->cd->circular_buffer)
1351 dev_err(&pl08x->adev->dev,
1352 "%s attempting to queue a circular buffer\n",
1353 __func__);
1354 else
1355 list_add_tail(&txd->node,
1356 &plchan->desc_list);
1357
1358 /*
1359 * See if we already have a physical channel allocated,
1360 * else this is the time to try to get one.
1361 */
1362 ret = prep_phy_channel(plchan, txd);
1363 if (ret) {
1364 /*
1365 * No physical channel available, we will
1366 * stack up the memcpy channels until there is a channel
1367 * available to handle it whereas slave transfers may
1368 * have been denied due to platform channel muxing restrictions
1369 * and since there is no guarantee that this will ever be
1370 * resolved, and since the signal must be aquired AFTER
1371 * aquiring the physical channel, we will let them be NACK:ed
1372 * with -EBUSY here. The drivers can alway retry the prep()
1373 * call if they are eager on doing this using DMA.
1374 */
1375 if (plchan->slave) {
1376 pl08x_free_txd_list(pl08x, plchan);
1377 spin_unlock_irqrestore(&plchan->lock, plchan->lockflags);
1378 return -EBUSY;
1379 }
1380 /* Do this memcpy whenever there is a channel ready */
1381 plchan->state = PL08X_CHAN_WAITING;
1382 plchan->waiting = txd;
1383 } else
1384 /*
1385 * Else we're all set, paused and ready to roll,
1386 * status will switch to PL08X_CHAN_RUNNING when
1387 * we call issue_pending(). If there is something
1388 * running on the channel already we don't change
1389 * its state.
1390 */
1391 if (plchan->state == PL08X_CHAN_IDLE)
1392 plchan->state = PL08X_CHAN_PAUSED;
1393
1394 /*
1395 * Notice that we leave plchan->lock locked on purpose:
1396 * it will be unlocked in the subsequent tx_submit()
1397 * call. This is a consequence of the current API.
1398 */
1399
1400 return 0;
1401}
1402
1403/*
1404 * Initialize a descriptor to be used by memcpy submit
1405 */
1406static struct dma_async_tx_descriptor *pl08x_prep_dma_memcpy(
1407 struct dma_chan *chan, dma_addr_t dest, dma_addr_t src,
1408 size_t len, unsigned long flags)
1409{
1410 struct pl08x_dma_chan *plchan = to_pl08x_chan(chan);
1411 struct pl08x_driver_data *pl08x = plchan->host;
1412 struct pl08x_txd *txd;
1413 int ret;
1414
1415 txd = kzalloc(sizeof(struct pl08x_txd), GFP_NOWAIT);
1416 if (!txd) {
1417 dev_err(&pl08x->adev->dev,
1418 "%s no memory for descriptor\n", __func__);
1419 return NULL;
1420 }
1421
1422 dma_async_tx_descriptor_init(&txd->tx, chan);
1423 txd->direction = DMA_NONE;
1424 txd->srcbus.addr = src;
1425 txd->dstbus.addr = dest;
1426
1427 /* Set platform data for m2m */
1428 txd->cd = &pl08x->pd->memcpy_channel;
1429 /* Both to be incremented or the code will break */
1430 txd->cd->cctl |= PL080_CONTROL_SRC_INCR | PL080_CONTROL_DST_INCR;
1431 txd->tx.tx_submit = pl08x_tx_submit;
1432 txd->tx.callback = NULL;
1433 txd->tx.callback_param = NULL;
1434 txd->len = len;
1435
1436 INIT_LIST_HEAD(&txd->node);
1437 ret = pl08x_prep_channel_resources(plchan, txd);
1438 if (ret)
1439 return NULL;
1440 /*
1441 * NB: the channel lock is held at this point so tx_submit()
1442 * must be called in direct succession.
1443 */
1444
1445 return &txd->tx;
1446}
1447
1448struct dma_async_tx_descriptor *pl08x_prep_slave_sg(
1449 struct dma_chan *chan, struct scatterlist *sgl,
1450 unsigned int sg_len, enum dma_data_direction direction,
1451 unsigned long flags)
1452{
1453 struct pl08x_dma_chan *plchan = to_pl08x_chan(chan);
1454 struct pl08x_driver_data *pl08x = plchan->host;
1455 struct pl08x_txd *txd;
1456 int ret;
1457
1458 /*
1459 * Current implementation ASSUMES only one sg
1460 */
1461 if (sg_len != 1) {
1462 dev_err(&pl08x->adev->dev, "%s prepared too long sglist\n",
1463 __func__);
1464 BUG();
1465 }
1466
1467 dev_dbg(&pl08x->adev->dev, "%s prepare transaction of %d bytes from %s\n",
1468 __func__, sgl->length, plchan->name);
1469
1470 txd = kzalloc(sizeof(struct pl08x_txd), GFP_NOWAIT);
1471 if (!txd) {
1472 dev_err(&pl08x->adev->dev, "%s no txd\n", __func__);
1473 return NULL;
1474 }
1475
1476 dma_async_tx_descriptor_init(&txd->tx, chan);
1477
1478 if (direction != plchan->runtime_direction)
1479 dev_err(&pl08x->adev->dev, "%s DMA setup does not match "
1480 "the direction configured for the PrimeCell\n",
1481 __func__);
1482
1483 /*
1484 * Set up addresses, the PrimeCell configured address
1485 * will take precedence since this may configure the
1486 * channel target address dynamically at runtime.
1487 */
1488 txd->direction = direction;
1489 if (direction == DMA_TO_DEVICE) {
1490 txd->srcbus.addr = sgl->dma_address;
1491 if (plchan->runtime_addr)
1492 txd->dstbus.addr = plchan->runtime_addr;
1493 else
1494 txd->dstbus.addr = plchan->cd->addr;
1495 } else if (direction == DMA_FROM_DEVICE) {
1496 if (plchan->runtime_addr)
1497 txd->srcbus.addr = plchan->runtime_addr;
1498 else
1499 txd->srcbus.addr = plchan->cd->addr;
1500 txd->dstbus.addr = sgl->dma_address;
1501 } else {
1502 dev_err(&pl08x->adev->dev,
1503 "%s direction unsupported\n", __func__);
1504 return NULL;
1505 }
1506 txd->cd = plchan->cd;
1507 txd->tx.tx_submit = pl08x_tx_submit;
1508 txd->tx.callback = NULL;
1509 txd->tx.callback_param = NULL;
1510 txd->len = sgl->length;
1511 INIT_LIST_HEAD(&txd->node);
1512
1513 ret = pl08x_prep_channel_resources(plchan, txd);
1514 if (ret)
1515 return NULL;
1516 /*
1517 * NB: the channel lock is held at this point so tx_submit()
1518 * must be called in direct succession.
1519 */
1520
1521 return &txd->tx;
1522}
1523
1524static int pl08x_control(struct dma_chan *chan, enum dma_ctrl_cmd cmd,
1525 unsigned long arg)
1526{
1527 struct pl08x_dma_chan *plchan = to_pl08x_chan(chan);
1528 struct pl08x_driver_data *pl08x = plchan->host;
1529 unsigned long flags;
1530 int ret = 0;
1531
1532 /* Controls applicable to inactive channels */
1533 if (cmd == DMA_SLAVE_CONFIG) {
1534 dma_set_runtime_config(chan,
1535 (struct dma_slave_config *)
1536 arg);
1537 return 0;
1538 }
1539
1540 /*
1541 * Anything succeeds on channels with no physical allocation and
1542 * no queued transfers.
1543 */
1544 spin_lock_irqsave(&plchan->lock, flags);
1545 if (!plchan->phychan && !plchan->at) {
1546 spin_unlock_irqrestore(&plchan->lock, flags);
1547 return 0;
1548 }
1549
1550 switch (cmd) {
1551 case DMA_TERMINATE_ALL:
1552 plchan->state = PL08X_CHAN_IDLE;
1553
1554 if (plchan->phychan) {
1555 pl08x_stop_phy_chan(plchan->phychan);
1556
1557 /*
1558 * Mark physical channel as free and free any slave
1559 * signal
1560 */
1561 if ((plchan->phychan->signal >= 0) &&
1562 pl08x->pd->put_signal) {
1563 pl08x->pd->put_signal(plchan);
1564 plchan->phychan->signal = -1;
1565 }
1566 pl08x_put_phy_channel(pl08x, plchan->phychan);
1567 plchan->phychan = NULL;
1568 }
1569 /* Stop any pending tasklet */
1570 tasklet_disable(&plchan->tasklet);
1571 /* Dequeue jobs and free LLIs */
1572 if (plchan->at) {
1573 pl08x_free_txd(pl08x, plchan->at);
1574 plchan->at = NULL;
1575 }
1576 /* Dequeue jobs not yet fired as well */
1577 pl08x_free_txd_list(pl08x, plchan);
1578 break;
1579 case DMA_PAUSE:
1580 pl08x_pause_phy_chan(plchan->phychan);
1581 plchan->state = PL08X_CHAN_PAUSED;
1582 break;
1583 case DMA_RESUME:
1584 pl08x_resume_phy_chan(plchan->phychan);
1585 plchan->state = PL08X_CHAN_RUNNING;
1586 break;
1587 default:
1588 /* Unknown command */
1589 ret = -ENXIO;
1590 break;
1591 }
1592
1593 spin_unlock_irqrestore(&plchan->lock, flags);
1594
1595 return ret;
1596}
1597
1598bool pl08x_filter_id(struct dma_chan *chan, void *chan_id)
1599{
1600 struct pl08x_dma_chan *plchan = to_pl08x_chan(chan);
1601 char *name = chan_id;
1602
1603 /* Check that the channel is not taken! */
1604 if (!strcmp(plchan->name, name))
1605 return true;
1606
1607 return false;
1608}
1609
1610/*
1611 * Just check that the device is there and active
1612 * TODO: turn this bit on/off depending on the number of
1613 * physical channels actually used, if it is zero... well
1614 * shut it off. That will save some power. Cut the clock
1615 * at the same time.
1616 */
1617static void pl08x_ensure_on(struct pl08x_driver_data *pl08x)
1618{
1619 u32 val;
1620
1621 val = readl(pl08x->base + PL080_CONFIG);
1622 val &= ~(PL080_CONFIG_M2_BE | PL080_CONFIG_M1_BE | PL080_CONFIG_ENABLE);
1623 /* We implictly clear bit 1 and that means little-endian mode */
1624 val |= PL080_CONFIG_ENABLE;
1625 writel(val, pl08x->base + PL080_CONFIG);
1626}
1627
1628static void pl08x_tasklet(unsigned long data)
1629{
1630 struct pl08x_dma_chan *plchan = (struct pl08x_dma_chan *) data;
1631 struct pl08x_phy_chan *phychan = plchan->phychan;
1632 struct pl08x_driver_data *pl08x = plchan->host;
1633
1634 if (!plchan)
1635 BUG();
1636
1637 spin_lock(&plchan->lock);
1638
1639 if (plchan->at) {
1640 dma_async_tx_callback callback =
1641 plchan->at->tx.callback;
1642 void *callback_param =
1643 plchan->at->tx.callback_param;
1644
1645 /*
1646 * Update last completed
1647 */
1648 plchan->lc =
1649 (plchan->at->tx.cookie);
1650
1651 /*
1652 * Callback to signal completion
1653 */
1654 if (callback)
1655 callback(callback_param);
1656
1657 /*
1658 * Device callbacks should NOT clear
1659 * the current transaction on the channel
1660 * Linus: sometimes they should?
1661 */
1662 if (!plchan->at)
1663 BUG();
1664
1665 /*
1666 * Free the descriptor if it's not for a device
1667 * using a circular buffer
1668 */
1669 if (!plchan->at->cd->circular_buffer) {
1670 pl08x_free_txd(pl08x, plchan->at);
1671 plchan->at = NULL;
1672 }
1673 /*
1674 * else descriptor for circular
1675 * buffers only freed when
1676 * client has disabled dma
1677 */
1678 }
1679 /*
1680 * If a new descriptor is queued, set it up
1681 * plchan->at is NULL here
1682 */
1683 if (!list_empty(&plchan->desc_list)) {
1684 struct pl08x_txd *next;
1685
1686 next = list_first_entry(&plchan->desc_list,
1687 struct pl08x_txd,
1688 node);
1689 list_del(&next->node);
1690 plchan->at = next;
1691 /* Configure the physical channel for the next txd */
1692 pl08x_config_phychan_for_txd(plchan);
1693 pl08x_set_cregs(pl08x, plchan->phychan);
1694 pl08x_enable_phy_chan(pl08x, plchan->phychan);
1695 } else {
1696 struct pl08x_dma_chan *waiting = NULL;
1697
1698 /*
1699 * No more jobs, so free up the physical channel
1700 * Free any allocated signal on slave transfers too
1701 */
1702 if ((phychan->signal >= 0) && pl08x->pd->put_signal) {
1703 pl08x->pd->put_signal(plchan);
1704 phychan->signal = -1;
1705 }
1706 pl08x_put_phy_channel(pl08x, phychan);
1707 plchan->phychan = NULL;
1708 plchan->state = PL08X_CHAN_IDLE;
1709
1710 /*
1711 * And NOW before anyone else can grab that free:d
1712 * up physical channel, see if there is some memcpy
1713 * pending that seriously needs to start because of
1714 * being stacked up while we were choking the
1715 * physical channels with data.
1716 */
1717 list_for_each_entry(waiting, &pl08x->memcpy.channels,
1718 chan.device_node) {
1719 if (waiting->state == PL08X_CHAN_WAITING &&
1720 waiting->waiting != NULL) {
1721 int ret;
1722
1723 /* This should REALLY not fail now */
1724 ret = prep_phy_channel(waiting,
1725 waiting->waiting);
1726 BUG_ON(ret);
1727 waiting->state = PL08X_CHAN_RUNNING;
1728 waiting->waiting = NULL;
1729 pl08x_issue_pending(&waiting->chan);
1730 break;
1731 }
1732 }
1733 }
1734
1735 spin_unlock(&plchan->lock);
1736}
1737
1738static irqreturn_t pl08x_irq(int irq, void *dev)
1739{
1740 struct pl08x_driver_data *pl08x = dev;
1741 u32 mask = 0;
1742 u32 val;
1743 int i;
1744
1745 val = readl(pl08x->base + PL080_ERR_STATUS);
1746 if (val) {
1747 /*
1748 * An error interrupt (on one or more channels)
1749 */
1750 dev_err(&pl08x->adev->dev,
1751 "%s error interrupt, register value 0x%08x\n",
1752 __func__, val);
1753 /*
1754 * Simply clear ALL PL08X error interrupts,
1755 * regardless of channel and cause
1756 * FIXME: should be 0x00000003 on PL081 really.
1757 */
1758 writel(0x000000FF, pl08x->base + PL080_ERR_CLEAR);
1759 }
1760 val = readl(pl08x->base + PL080_INT_STATUS);
1761 for (i = 0; i < pl08x->vd->channels; i++) {
1762 if ((1 << i) & val) {
1763 /* Locate physical channel */
1764 struct pl08x_phy_chan *phychan = &pl08x->phy_chans[i];
1765 struct pl08x_dma_chan *plchan = phychan->serving;
1766
1767 /* Schedule tasklet on this channel */
1768 tasklet_schedule(&plchan->tasklet);
1769
1770 mask |= (1 << i);
1771 }
1772 }
1773 /*
1774 * Clear only the terminal interrupts on channels we processed
1775 */
1776 writel(mask, pl08x->base + PL080_TC_CLEAR);
1777
1778 return mask ? IRQ_HANDLED : IRQ_NONE;
1779}
1780
1781/*
1782 * Initialise the DMAC memcpy/slave channels.
1783 * Make a local wrapper to hold required data
1784 */
1785static int pl08x_dma_init_virtual_channels(struct pl08x_driver_data *pl08x,
1786 struct dma_device *dmadev,
1787 unsigned int channels,
1788 bool slave)
1789{
1790 struct pl08x_dma_chan *chan;
1791 int i;
1792
1793 INIT_LIST_HEAD(&dmadev->channels);
1794 /*
1795 * Register as many many memcpy as we have physical channels,
1796 * we won't always be able to use all but the code will have
1797 * to cope with that situation.
1798 */
1799 for (i = 0; i < channels; i++) {
1800 chan = kzalloc(sizeof(struct pl08x_dma_chan), GFP_KERNEL);
1801 if (!chan) {
1802 dev_err(&pl08x->adev->dev,
1803 "%s no memory for channel\n", __func__);
1804 return -ENOMEM;
1805 }
1806
1807 chan->host = pl08x;
1808 chan->state = PL08X_CHAN_IDLE;
1809
1810 if (slave) {
1811 chan->slave = true;
1812 chan->name = pl08x->pd->slave_channels[i].bus_id;
1813 chan->cd = &pl08x->pd->slave_channels[i];
1814 } else {
1815 chan->cd = &pl08x->pd->memcpy_channel;
1816 chan->name = kasprintf(GFP_KERNEL, "memcpy%d", i);
1817 if (!chan->name) {
1818 kfree(chan);
1819 return -ENOMEM;
1820 }
1821 }
1822 dev_info(&pl08x->adev->dev,
1823 "initialize virtual channel \"%s\"\n",
1824 chan->name);
1825
1826 chan->chan.device = dmadev;
1827 atomic_set(&chan->last_issued, 0);
1828 chan->lc = atomic_read(&chan->last_issued);
1829
1830 spin_lock_init(&chan->lock);
1831 INIT_LIST_HEAD(&chan->desc_list);
1832 tasklet_init(&chan->tasklet, pl08x_tasklet,
1833 (unsigned long) chan);
1834
1835 list_add_tail(&chan->chan.device_node, &dmadev->channels);
1836 }
1837 dev_info(&pl08x->adev->dev, "initialized %d virtual %s channels\n",
1838 i, slave ? "slave" : "memcpy");
1839 return i;
1840}
1841
1842static void pl08x_free_virtual_channels(struct dma_device *dmadev)
1843{
1844 struct pl08x_dma_chan *chan = NULL;
1845 struct pl08x_dma_chan *next;
1846
1847 list_for_each_entry_safe(chan,
1848 next, &dmadev->channels, chan.device_node) {
1849 list_del(&chan->chan.device_node);
1850 kfree(chan);
1851 }
1852}
1853
1854#ifdef CONFIG_DEBUG_FS
1855static const char *pl08x_state_str(enum pl08x_dma_chan_state state)
1856{
1857 switch (state) {
1858 case PL08X_CHAN_IDLE:
1859 return "idle";
1860 case PL08X_CHAN_RUNNING:
1861 return "running";
1862 case PL08X_CHAN_PAUSED:
1863 return "paused";
1864 case PL08X_CHAN_WAITING:
1865 return "waiting";
1866 default:
1867 break;
1868 }
1869 return "UNKNOWN STATE";
1870}
1871
1872static int pl08x_debugfs_show(struct seq_file *s, void *data)
1873{
1874 struct pl08x_driver_data *pl08x = s->private;
1875 struct pl08x_dma_chan *chan;
1876 struct pl08x_phy_chan *ch;
1877 unsigned long flags;
1878 int i;
1879
1880 seq_printf(s, "PL08x physical channels:\n");
1881 seq_printf(s, "CHANNEL:\tUSER:\n");
1882 seq_printf(s, "--------\t-----\n");
1883 for (i = 0; i < pl08x->vd->channels; i++) {
1884 struct pl08x_dma_chan *virt_chan;
1885
1886 ch = &pl08x->phy_chans[i];
1887
1888 spin_lock_irqsave(&ch->lock, flags);
1889 virt_chan = ch->serving;
1890
1891 seq_printf(s, "%d\t\t%s\n",
1892 ch->id, virt_chan ? virt_chan->name : "(none)");
1893
1894 spin_unlock_irqrestore(&ch->lock, flags);
1895 }
1896
1897 seq_printf(s, "\nPL08x virtual memcpy channels:\n");
1898 seq_printf(s, "CHANNEL:\tSTATE:\n");
1899 seq_printf(s, "--------\t------\n");
1900 list_for_each_entry(chan, &pl08x->memcpy.channels, chan.device_node) {
1901 seq_printf(s, "%s\t\t\%s\n", chan->name,
1902 pl08x_state_str(chan->state));
1903 }
1904
1905 seq_printf(s, "\nPL08x virtual slave channels:\n");
1906 seq_printf(s, "CHANNEL:\tSTATE:\n");
1907 seq_printf(s, "--------\t------\n");
1908 list_for_each_entry(chan, &pl08x->slave.channels, chan.device_node) {
1909 seq_printf(s, "%s\t\t\%s\n", chan->name,
1910 pl08x_state_str(chan->state));
1911 }
1912
1913 return 0;
1914}
1915
1916static int pl08x_debugfs_open(struct inode *inode, struct file *file)
1917{
1918 return single_open(file, pl08x_debugfs_show, inode->i_private);
1919}
1920
1921static const struct file_operations pl08x_debugfs_operations = {
1922 .open = pl08x_debugfs_open,
1923 .read = seq_read,
1924 .llseek = seq_lseek,
1925 .release = single_release,
1926};
1927
1928static void init_pl08x_debugfs(struct pl08x_driver_data *pl08x)
1929{
1930 /* Expose a simple debugfs interface to view all clocks */
1931 (void) debugfs_create_file(dev_name(&pl08x->adev->dev), S_IFREG | S_IRUGO,
1932 NULL, pl08x,
1933 &pl08x_debugfs_operations);
1934}
1935
1936#else
1937static inline void init_pl08x_debugfs(struct pl08x_driver_data *pl08x)
1938{
1939}
1940#endif
1941
1942static int pl08x_probe(struct amba_device *adev, struct amba_id *id)
1943{
1944 struct pl08x_driver_data *pl08x;
1945 struct vendor_data *vd = id->data;
1946 int ret = 0;
1947 int i;
1948
1949 ret = amba_request_regions(adev, NULL);
1950 if (ret)
1951 return ret;
1952
1953 /* Create the driver state holder */
1954 pl08x = kzalloc(sizeof(struct pl08x_driver_data), GFP_KERNEL);
1955 if (!pl08x) {
1956 ret = -ENOMEM;
1957 goto out_no_pl08x;
1958 }
1959
1960 /* Initialize memcpy engine */
1961 dma_cap_set(DMA_MEMCPY, pl08x->memcpy.cap_mask);
1962 pl08x->memcpy.dev = &adev->dev;
1963 pl08x->memcpy.device_alloc_chan_resources = pl08x_alloc_chan_resources;
1964 pl08x->memcpy.device_free_chan_resources = pl08x_free_chan_resources;
1965 pl08x->memcpy.device_prep_dma_memcpy = pl08x_prep_dma_memcpy;
1966 pl08x->memcpy.device_prep_dma_interrupt = pl08x_prep_dma_interrupt;
1967 pl08x->memcpy.device_tx_status = pl08x_dma_tx_status;
1968 pl08x->memcpy.device_issue_pending = pl08x_issue_pending;
1969 pl08x->memcpy.device_control = pl08x_control;
1970
1971 /* Initialize slave engine */
1972 dma_cap_set(DMA_SLAVE, pl08x->slave.cap_mask);
1973 pl08x->slave.dev = &adev->dev;
1974 pl08x->slave.device_alloc_chan_resources = pl08x_alloc_chan_resources;
1975 pl08x->slave.device_free_chan_resources = pl08x_free_chan_resources;
1976 pl08x->slave.device_prep_dma_interrupt = pl08x_prep_dma_interrupt;
1977 pl08x->slave.device_tx_status = pl08x_dma_tx_status;
1978 pl08x->slave.device_issue_pending = pl08x_issue_pending;
1979 pl08x->slave.device_prep_slave_sg = pl08x_prep_slave_sg;
1980 pl08x->slave.device_control = pl08x_control;
1981
1982 /* Get the platform data */
1983 pl08x->pd = dev_get_platdata(&adev->dev);
1984 if (!pl08x->pd) {
1985 dev_err(&adev->dev, "no platform data supplied\n");
1986 goto out_no_platdata;
1987 }
1988
1989 /* Assign useful pointers to the driver state */
1990 pl08x->adev = adev;
1991 pl08x->vd = vd;
1992
1993 /* A DMA memory pool for LLIs, align on 1-byte boundary */
1994 pl08x->pool = dma_pool_create(DRIVER_NAME, &pl08x->adev->dev,
1995 PL08X_LLI_TSFR_SIZE, PL08X_ALIGN, 0);
1996 if (!pl08x->pool) {
1997 ret = -ENOMEM;
1998 goto out_no_lli_pool;
1999 }
2000
2001 spin_lock_init(&pl08x->lock);
2002
2003 pl08x->base = ioremap(adev->res.start, resource_size(&adev->res));
2004 if (!pl08x->base) {
2005 ret = -ENOMEM;
2006 goto out_no_ioremap;
2007 }
2008
2009 /* Turn on the PL08x */
2010 pl08x_ensure_on(pl08x);
2011
2012 /*
2013 * Attach the interrupt handler
2014 */
2015 writel(0x000000FF, pl08x->base + PL080_ERR_CLEAR);
2016 writel(0x000000FF, pl08x->base + PL080_TC_CLEAR);
2017
2018 ret = request_irq(adev->irq[0], pl08x_irq, IRQF_DISABLED,
2019 vd->name, pl08x);
2020 if (ret) {
2021 dev_err(&adev->dev, "%s failed to request interrupt %d\n",
2022 __func__, adev->irq[0]);
2023 goto out_no_irq;
2024 }
2025
2026 /* Initialize physical channels */
2027 pl08x->phy_chans = kmalloc((vd->channels * sizeof(struct pl08x_phy_chan)),
2028 GFP_KERNEL);
2029 if (!pl08x->phy_chans) {
2030 dev_err(&adev->dev, "%s failed to allocate "
2031 "physical channel holders\n",
2032 __func__);
2033 goto out_no_phychans;
2034 }
2035
2036 for (i = 0; i < vd->channels; i++) {
2037 struct pl08x_phy_chan *ch = &pl08x->phy_chans[i];
2038
2039 ch->id = i;
2040 ch->base = pl08x->base + PL080_Cx_BASE(i);
2041 spin_lock_init(&ch->lock);
2042 ch->serving = NULL;
2043 ch->signal = -1;
2044 dev_info(&adev->dev,
2045 "physical channel %d is %s\n", i,
2046 pl08x_phy_channel_busy(ch) ? "BUSY" : "FREE");
2047 }
2048
2049 /* Register as many memcpy channels as there are physical channels */
2050 ret = pl08x_dma_init_virtual_channels(pl08x, &pl08x->memcpy,
2051 pl08x->vd->channels, false);
2052 if (ret <= 0) {
2053 dev_warn(&pl08x->adev->dev,
2054 "%s failed to enumerate memcpy channels - %d\n",
2055 __func__, ret);
2056 goto out_no_memcpy;
2057 }
2058 pl08x->memcpy.chancnt = ret;
2059
2060 /* Register slave channels */
2061 ret = pl08x_dma_init_virtual_channels(pl08x, &pl08x->slave,
2062 pl08x->pd->num_slave_channels,
2063 true);
2064 if (ret <= 0) {
2065 dev_warn(&pl08x->adev->dev,
2066 "%s failed to enumerate slave channels - %d\n",
2067 __func__, ret);
2068 goto out_no_slave;
2069 }
2070 pl08x->slave.chancnt = ret;
2071
2072 ret = dma_async_device_register(&pl08x->memcpy);
2073 if (ret) {
2074 dev_warn(&pl08x->adev->dev,
2075 "%s failed to register memcpy as an async device - %d\n",
2076 __func__, ret);
2077 goto out_no_memcpy_reg;
2078 }
2079
2080 ret = dma_async_device_register(&pl08x->slave);
2081 if (ret) {
2082 dev_warn(&pl08x->adev->dev,
2083 "%s failed to register slave as an async device - %d\n",
2084 __func__, ret);
2085 goto out_no_slave_reg;
2086 }
2087
2088 amba_set_drvdata(adev, pl08x);
2089 init_pl08x_debugfs(pl08x);
2090 dev_info(&pl08x->adev->dev, "ARM(R) %s DMA block initialized @%08x\n",
2091 vd->name, adev->res.start);
2092 return 0;
2093
2094out_no_slave_reg:
2095 dma_async_device_unregister(&pl08x->memcpy);
2096out_no_memcpy_reg:
2097 pl08x_free_virtual_channels(&pl08x->slave);
2098out_no_slave:
2099 pl08x_free_virtual_channels(&pl08x->memcpy);
2100out_no_memcpy:
2101 kfree(pl08x->phy_chans);
2102out_no_phychans:
2103 free_irq(adev->irq[0], pl08x);
2104out_no_irq:
2105 iounmap(pl08x->base);
2106out_no_ioremap:
2107 dma_pool_destroy(pl08x->pool);
2108out_no_lli_pool:
2109out_no_platdata:
2110 kfree(pl08x);
2111out_no_pl08x:
2112 amba_release_regions(adev);
2113 return ret;
2114}
2115
2116/* PL080 has 8 channels and the PL080 have just 2 */
2117static struct vendor_data vendor_pl080 = {
2118 .name = "PL080",
2119 .channels = 8,
2120 .dualmaster = true,
2121};
2122
2123static struct vendor_data vendor_pl081 = {
2124 .name = "PL081",
2125 .channels = 2,
2126 .dualmaster = false,
2127};
2128
2129static struct amba_id pl08x_ids[] = {
2130 /* PL080 */
2131 {
2132 .id = 0x00041080,
2133 .mask = 0x000fffff,
2134 .data = &vendor_pl080,
2135 },
2136 /* PL081 */
2137 {
2138 .id = 0x00041081,
2139 .mask = 0x000fffff,
2140 .data = &vendor_pl081,
2141 },
2142 /* Nomadik 8815 PL080 variant */
2143 {
2144 .id = 0x00280880,
2145 .mask = 0x00ffffff,
2146 .data = &vendor_pl080,
2147 },
2148 { 0, 0 },
2149};
2150
2151static struct amba_driver pl08x_amba_driver = {
2152 .drv.name = DRIVER_NAME,
2153 .id_table = pl08x_ids,
2154 .probe = pl08x_probe,
2155};
2156
2157static int __init pl08x_init(void)
2158{
2159 int retval;
2160 retval = amba_driver_register(&pl08x_amba_driver);
2161 if (retval)
2162 printk(KERN_WARNING DRIVER_NAME
2163 "failed to register as an amba device (%d)\n",
2164 retval);
2165 return retval;
2166}
2167subsys_initcall(pl08x_init);
diff --git a/include/linux/amba/pl08x.h b/include/linux/amba/pl08x.h
new file mode 100644
index 000000000000..521a0f8974ac
--- /dev/null
+++ b/include/linux/amba/pl08x.h
@@ -0,0 +1,222 @@
1/*
2 * linux/amba/pl08x.h - ARM PrimeCell DMA Controller driver
3 *
4 * Copyright (C) 2005 ARM Ltd
5 * Copyright (C) 2010 ST-Ericsson SA
6 *
7 * This program is free software; you can redistribute it and/or modify
8 * it under the terms of the GNU General Public License version 2 as
9 * published by the Free Software Foundation.
10 *
11 * pl08x information required by platform code
12 *
13 * Please credit ARM.com
14 * Documentation: ARM DDI 0196D
15 *
16 */
17
18#ifndef AMBA_PL08X_H
19#define AMBA_PL08X_H
20
21/* We need sizes of structs from this header */
22#include <linux/dmaengine.h>
23#include <linux/interrupt.h>
24
25/**
26 * struct pl08x_channel_data - data structure to pass info between
27 * platform and PL08x driver regarding channel configuration
28 * @bus_id: name of this device channel, not just a device name since
29 * devices may have more than one channel e.g. "foo_tx"
30 * @min_signal: the minimum DMA signal number to be muxed in for this
31 * channel (for platforms supporting muxed signals). If you have
32 * static assignments, make sure this is set to the assigned signal
33 * number, PL08x have 16 possible signals in number 0 thru 15 so
34 * when these are not enough they often get muxed (in hardware)
35 * disabling simultaneous use of the same channel for two devices.
36 * @max_signal: the maximum DMA signal number to be muxed in for
37 * the channel. Set to the same as min_signal for
38 * devices with static assignments
39 * @muxval: a number usually used to poke into some mux regiser to
40 * mux in the signal to this channel
41 * @cctl_opt: default options for the channel control register
42 * @addr: source/target address in physical memory for this DMA channel,
43 * can be the address of a FIFO register for burst requests for example.
44 * This can be left undefined if the PrimeCell API is used for configuring
45 * this.
46 * @circular_buffer: whether the buffer passed in is circular and
47 * shall simply be looped round round (like a record baby round
48 * round round round)
49 * @single: the device connected to this channel will request single
50 * DMA transfers, not bursts. (Bursts are default.)
51 */
52struct pl08x_channel_data {
53 char *bus_id;
54 int min_signal;
55 int max_signal;
56 u32 muxval;
57 u32 cctl;
58 u32 ccfg;
59 dma_addr_t addr;
60 bool circular_buffer;
61 bool single;
62};
63
64/**
65 * Struct pl08x_bus_data - information of source or destination
66 * busses for a transfer
67 * @addr: current address
68 * @maxwidth: the maximum width of a transfer on this bus
69 * @buswidth: the width of this bus in bytes: 1, 2 or 4
70 * @fill_bytes: bytes required to fill to the next bus memory
71 * boundary
72 */
73struct pl08x_bus_data {
74 dma_addr_t addr;
75 u8 maxwidth;
76 u8 buswidth;
77 u32 fill_bytes;
78};
79
80/**
81 * struct pl08x_phy_chan - holder for the physical channels
82 * @id: physical index to this channel
83 * @lock: a lock to use when altering an instance of this struct
84 * @signal: the physical signal (aka channel) serving this
85 * physical channel right now
86 * @serving: the virtual channel currently being served by this
87 * physical channel
88 */
89struct pl08x_phy_chan {
90 unsigned int id;
91 void __iomem *base;
92 spinlock_t lock;
93 int signal;
94 struct pl08x_dma_chan *serving;
95 u32 csrc;
96 u32 cdst;
97 u32 clli;
98 u32 cctl;
99 u32 ccfg;
100};
101
102/**
103 * struct pl08x_txd - wrapper for struct dma_async_tx_descriptor
104 * @llis_bus: DMA memory address (physical) start for the LLIs
105 * @llis_va: virtual memory address start for the LLIs
106 */
107struct pl08x_txd {
108 struct dma_async_tx_descriptor tx;
109 struct list_head node;
110 enum dma_data_direction direction;
111 struct pl08x_bus_data srcbus;
112 struct pl08x_bus_data dstbus;
113 int len;
114 dma_addr_t llis_bus;
115 void *llis_va;
116 struct pl08x_channel_data *cd;
117 bool active;
118 /*
119 * Settings to be put into the physical channel when we
120 * trigger this txd
121 */
122 u32 csrc;
123 u32 cdst;
124 u32 clli;
125 u32 cctl;
126};
127
128/**
129 * struct pl08x_dma_chan_state - holds the PL08x specific virtual
130 * channel states
131 * @PL08X_CHAN_IDLE: the channel is idle
132 * @PL08X_CHAN_RUNNING: the channel has allocated a physical transport
133 * channel and is running a transfer on it
134 * @PL08X_CHAN_PAUSED: the channel has allocated a physical transport
135 * channel, but the transfer is currently paused
136 * @PL08X_CHAN_WAITING: the channel is waiting for a physical transport
137 * channel to become available (only pertains to memcpy channels)
138 */
139enum pl08x_dma_chan_state {
140 PL08X_CHAN_IDLE,
141 PL08X_CHAN_RUNNING,
142 PL08X_CHAN_PAUSED,
143 PL08X_CHAN_WAITING,
144};
145
146/**
147 * struct pl08x_dma_chan - this structure wraps a DMA ENGINE channel
148 * @chan: wrappped abstract channel
149 * @phychan: the physical channel utilized by this channel, if there is one
150 * @tasklet: tasklet scheduled by the IRQ to handle actual work etc
151 * @name: name of channel
152 * @cd: channel platform data
153 * @runtime_addr: address for RX/TX according to the runtime config
154 * @runtime_direction: current direction of this channel according to
155 * runtime config
156 * @lc: last completed transaction on this channel
157 * @desc_list: queued transactions pending on this channel
158 * @at: active transaction on this channel
159 * @lockflags: sometimes we let a lock last between two function calls,
160 * especially prep/submit, and then we need to store the IRQ flags
161 * in the channel state, here
162 * @lock: a lock for this channel data
163 * @host: a pointer to the host (internal use)
164 * @state: whether the channel is idle, paused, running etc
165 * @slave: whether this channel is a device (slave) or for memcpy
166 * @waiting: a TX descriptor on this channel which is waiting for
167 * a physical channel to become available
168 */
169struct pl08x_dma_chan {
170 struct dma_chan chan;
171 struct pl08x_phy_chan *phychan;
172 struct tasklet_struct tasklet;
173 char *name;
174 struct pl08x_channel_data *cd;
175 dma_addr_t runtime_addr;
176 enum dma_data_direction runtime_direction;
177 atomic_t last_issued;
178 dma_cookie_t lc;
179 struct list_head desc_list;
180 struct pl08x_txd *at;
181 unsigned long lockflags;
182 spinlock_t lock;
183 void *host;
184 enum pl08x_dma_chan_state state;
185 bool slave;
186 struct pl08x_txd *waiting;
187};
188
189/**
190 * struct pl08x_platform_data - the platform configuration for the
191 * PL08x PrimeCells.
192 * @slave_channels: the channels defined for the different devices on the
193 * platform, all inclusive, including multiplexed channels. The available
194 * physical channels will be multiplexed around these signals as they
195 * are requested, just enumerate all possible channels.
196 * @get_signal: request a physical signal to be used for a DMA
197 * transfer immediately: if there is some multiplexing or similar blocking
198 * the use of the channel the transfer can be denied by returning
199 * less than zero, else it returns the allocated signal number
200 * @put_signal: indicate to the platform that this physical signal is not
201 * running any DMA transfer and multiplexing can be recycled
202 * @bus_bit_lli: Bit[0] of the address indicated which AHB bus master the
203 * LLI addresses are on 0/1 Master 1/2.
204 */
205struct pl08x_platform_data {
206 struct pl08x_channel_data *slave_channels;
207 unsigned int num_slave_channels;
208 struct pl08x_channel_data memcpy_channel;
209 int (*get_signal)(struct pl08x_dma_chan *);
210 void (*put_signal)(struct pl08x_dma_chan *);
211};
212
213#ifdef CONFIG_AMBA_PL08X
214bool pl08x_filter_id(struct dma_chan *chan, void *chan_id);
215#else
216static inline bool pl08x_filter_id(struct dma_chan *chan, void *chan_id)
217{
218 return false;
219}
220#endif
221
222#endif /* AMBA_PL08X_H */
generated by cgit v1.2.2 (git 2.25.0) at 2025-11-11 14:38:40 -0500