2 * Copyright (c) 2006 ARM Ltd.
3 * Copyright (c) 2010 ST-Ericsson SA
5 * Author: Peter Pearse <peter.pearse@arm.com>
6 * Author: Linus Walleij <linus.walleij@stericsson.com>
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)
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
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.
22 * The full GNU General Public License is in this distribution in the file
25 * Documentation: ARM DDI 0196G == PL080
26 * Documentation: ARM DDI 0218E == PL081
28 * PL080 & PL081 both have 16 sets of DMA signals that can be routed to any
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.
37 * The PL080 has a dual bus master, PL081 has a single master.
39 * Memory to peripheral transfer may be visualized as
40 * Get data from memory to DMAC
42 * On burst request from peripheral
43 * Destination burst from DMAC to peripheral
45 * Raise terminal count interrupt
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
51 * (Bursts are irrelevant for mem to mem transfers - there are no burst
52 * signals, the DMA controller will simply facilitate its AHB master.)
54 * ASSUMES default (little) endianness for DMA transfers
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
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.
70 * - Break out common code from arch/arm/mach-s3c64xx and share
72 #include <linux/amba/bus.h>
73 #include <linux/amba/pl08x.h>
74 #include <linux/debugfs.h>
75 #include <linux/delay.h>
76 #include <linux/device.h>
77 #include <linux/dmaengine.h>
78 #include <linux/dmapool.h>
79 #include <linux/dma-mapping.h>
80 #include <linux/init.h>
81 #include <linux/interrupt.h>
82 #include <linux/module.h>
83 #include <linux/pm_runtime.h>
84 #include <linux/seq_file.h>
85 #include <linux/slab.h>
86 #include <asm/hardware/pl080.h>
88 #include "dmaengine.h"
91 #define DRIVER_NAME "pl08xdmac"
93 static struct amba_driver pl08x_amba_driver
;
94 struct pl08x_driver_data
;
97 * struct vendor_data - vendor-specific config parameters for PL08x derivatives
98 * @channels: the number of channels available in this variant
99 * @dualmaster: whether this version supports dual AHB masters or not.
100 * @nomadik: whether the channels have Nomadik security extension bits
101 * that need to be checked for permission before use and some registers are
111 * PL08X private data structures
112 * An LLI struct - see PL08x TRM. Note that next uses bit[0] as a bus bit,
113 * start & end do not - their bus bit info is in cctl. Also note that these
114 * are fixed 32-bit quantities.
124 * struct pl08x_bus_data - information of source or destination
125 * busses for a transfer
126 * @addr: current address
127 * @maxwidth: the maximum width of a transfer on this bus
128 * @buswidth: the width of this bus in bytes: 1, 2 or 4
130 struct pl08x_bus_data
{
137 * struct pl08x_phy_chan - holder for the physical channels
138 * @id: physical index to this channel
139 * @lock: a lock to use when altering an instance of this struct
140 * @serving: the virtual channel currently being served by this physical
142 * @locked: channel unavailable for the system, e.g. dedicated to secure
145 struct pl08x_phy_chan
{
149 struct pl08x_dma_chan
*serving
;
154 * struct pl08x_sg - structure containing data per sg
155 * @src_addr: src address of sg
156 * @dst_addr: dst address of sg
157 * @len: transfer len in bytes
158 * @node: node for txd's dsg_list
164 struct list_head node
;
168 * struct pl08x_txd - wrapper for struct dma_async_tx_descriptor
169 * @vd: virtual DMA descriptor
170 * @dsg_list: list of children sg's
171 * @llis_bus: DMA memory address (physical) start for the LLIs
172 * @llis_va: virtual memory address start for the LLIs
173 * @cctl: control reg values for current txd
174 * @ccfg: config reg values for current txd
175 * @done: this marks completed descriptors, which should not have their
179 struct virt_dma_desc vd
;
180 struct list_head dsg_list
;
182 struct pl08x_lli
*llis_va
;
183 /* Default cctl value for LLIs */
186 * Settings to be put into the physical channel when we
187 * trigger this txd. Other registers are in llis_va[0].
194 * struct pl08x_dma_chan_state - holds the PL08x specific virtual channel
196 * @PL08X_CHAN_IDLE: the channel is idle
197 * @PL08X_CHAN_RUNNING: the channel has allocated a physical transport
198 * channel and is running a transfer on it
199 * @PL08X_CHAN_PAUSED: the channel has allocated a physical transport
200 * channel, but the transfer is currently paused
201 * @PL08X_CHAN_WAITING: the channel is waiting for a physical transport
202 * channel to become available (only pertains to memcpy channels)
204 enum pl08x_dma_chan_state
{
212 * struct pl08x_dma_chan - this structure wraps a DMA ENGINE channel
213 * @vc: wrappped virtual channel
214 * @phychan: the physical channel utilized by this channel, if there is one
215 * @name: name of channel
216 * @cd: channel platform data
217 * @runtime_addr: address for RX/TX according to the runtime config
218 * @at: active transaction on this channel
219 * @lock: a lock for this channel data
220 * @host: a pointer to the host (internal use)
221 * @state: whether the channel is idle, paused, running etc
222 * @slave: whether this channel is a device (slave) or for memcpy
223 * @signal: the physical DMA request signal which this channel is using
224 * @mux_use: count of descriptors using this DMA request signal setting
226 struct pl08x_dma_chan
{
227 struct virt_dma_chan vc
;
228 struct pl08x_phy_chan
*phychan
;
230 const struct pl08x_channel_data
*cd
;
231 struct dma_slave_config cfg
;
232 struct pl08x_txd
*at
;
233 struct pl08x_driver_data
*host
;
234 enum pl08x_dma_chan_state state
;
241 * struct pl08x_driver_data - the local state holder for the PL08x
242 * @slave: slave engine for this instance
243 * @memcpy: memcpy engine for this instance
244 * @base: virtual memory base (remapped) for the PL08x
245 * @adev: the corresponding AMBA (PrimeCell) bus entry
246 * @vd: vendor data for this PL08x variant
247 * @pd: platform data passed in from the platform/machine
248 * @phy_chans: array of data for the physical channels
249 * @pool: a pool for the LLI descriptors
250 * @lli_buses: bitmask to or in to LLI pointer selecting AHB port for LLI
252 * @mem_buses: set to indicate memory transfers on AHB2.
253 * @lock: a spinlock for this struct
255 struct pl08x_driver_data
{
256 struct dma_device slave
;
257 struct dma_device memcpy
;
259 struct amba_device
*adev
;
260 const struct vendor_data
*vd
;
261 struct pl08x_platform_data
*pd
;
262 struct pl08x_phy_chan
*phy_chans
;
263 struct dma_pool
*pool
;
269 * PL08X specific defines
272 /* Size (bytes) of each LLI buffer allocated for one transfer */
273 # define PL08X_LLI_TSFR_SIZE 0x2000
275 /* Maximum times we call dma_pool_alloc on this pool without freeing */
276 #define MAX_NUM_TSFR_LLIS (PL08X_LLI_TSFR_SIZE/sizeof(struct pl08x_lli))
277 #define PL08X_ALIGN 8
279 static inline struct pl08x_dma_chan
*to_pl08x_chan(struct dma_chan
*chan
)
281 return container_of(chan
, struct pl08x_dma_chan
, vc
.chan
);
284 static inline struct pl08x_txd
*to_pl08x_txd(struct dma_async_tx_descriptor
*tx
)
286 return container_of(tx
, struct pl08x_txd
, vd
.tx
);
292 * This gives us the DMA request input to the PL08x primecell which the
293 * peripheral described by the channel data will be routed to, possibly
294 * via a board/SoC specific external MUX. One important point to note
295 * here is that this does not depend on the physical channel.
297 static int pl08x_request_mux(struct pl08x_dma_chan
*plchan
)
299 const struct pl08x_platform_data
*pd
= plchan
->host
->pd
;
302 if (plchan
->mux_use
++ == 0 && pd
->get_signal
) {
303 ret
= pd
->get_signal(plchan
->cd
);
309 plchan
->signal
= ret
;
314 static void pl08x_release_mux(struct pl08x_dma_chan
*plchan
)
316 const struct pl08x_platform_data
*pd
= plchan
->host
->pd
;
318 if (plchan
->signal
>= 0) {
319 WARN_ON(plchan
->mux_use
== 0);
321 if (--plchan
->mux_use
== 0 && pd
->put_signal
) {
322 pd
->put_signal(plchan
->cd
, plchan
->signal
);
329 * Physical channel handling
332 /* Whether a certain channel is busy or not */
333 static int pl08x_phy_channel_busy(struct pl08x_phy_chan
*ch
)
337 val
= readl(ch
->base
+ PL080_CH_CONFIG
);
338 return val
& PL080_CONFIG_ACTIVE
;
342 * Set the initial DMA register values i.e. those for the first LLI
343 * The next LLI pointer and the configuration interrupt bit have
344 * been set when the LLIs were constructed. Poke them into the hardware
345 * and start the transfer.
347 static void pl08x_start_next_txd(struct pl08x_dma_chan
*plchan
)
349 struct pl08x_driver_data
*pl08x
= plchan
->host
;
350 struct pl08x_phy_chan
*phychan
= plchan
->phychan
;
351 struct virt_dma_desc
*vd
= vchan_next_desc(&plchan
->vc
);
352 struct pl08x_txd
*txd
= to_pl08x_txd(&vd
->tx
);
353 struct pl08x_lli
*lli
;
356 list_del(&txd
->vd
.node
);
360 /* Wait for channel inactive */
361 while (pl08x_phy_channel_busy(phychan
))
364 lli
= &txd
->llis_va
[0];
366 dev_vdbg(&pl08x
->adev
->dev
,
367 "WRITE channel %d: csrc=0x%08x, cdst=0x%08x, "
368 "clli=0x%08x, cctl=0x%08x, ccfg=0x%08x\n",
369 phychan
->id
, lli
->src
, lli
->dst
, lli
->lli
, lli
->cctl
,
372 writel(lli
->src
, phychan
->base
+ PL080_CH_SRC_ADDR
);
373 writel(lli
->dst
, phychan
->base
+ PL080_CH_DST_ADDR
);
374 writel(lli
->lli
, phychan
->base
+ PL080_CH_LLI
);
375 writel(lli
->cctl
, phychan
->base
+ PL080_CH_CONTROL
);
376 writel(txd
->ccfg
, phychan
->base
+ PL080_CH_CONFIG
);
378 /* Enable the DMA channel */
379 /* Do not access config register until channel shows as disabled */
380 while (readl(pl08x
->base
+ PL080_EN_CHAN
) & (1 << phychan
->id
))
383 /* Do not access config register until channel shows as inactive */
384 val
= readl(phychan
->base
+ PL080_CH_CONFIG
);
385 while ((val
& PL080_CONFIG_ACTIVE
) || (val
& PL080_CONFIG_ENABLE
))
386 val
= readl(phychan
->base
+ PL080_CH_CONFIG
);
388 writel(val
| PL080_CONFIG_ENABLE
, phychan
->base
+ PL080_CH_CONFIG
);
392 * Pause the channel by setting the HALT bit.
394 * For M->P transfers, pause the DMAC first and then stop the peripheral -
395 * the FIFO can only drain if the peripheral is still requesting data.
396 * (note: this can still timeout if the DMAC FIFO never drains of data.)
398 * For P->M transfers, disable the peripheral first to stop it filling
399 * the DMAC FIFO, and then pause the DMAC.
401 static void pl08x_pause_phy_chan(struct pl08x_phy_chan
*ch
)
406 /* Set the HALT bit and wait for the FIFO to drain */
407 val
= readl(ch
->base
+ PL080_CH_CONFIG
);
408 val
|= PL080_CONFIG_HALT
;
409 writel(val
, ch
->base
+ PL080_CH_CONFIG
);
411 /* Wait for channel inactive */
412 for (timeout
= 1000; timeout
; timeout
--) {
413 if (!pl08x_phy_channel_busy(ch
))
417 if (pl08x_phy_channel_busy(ch
))
418 pr_err("pl08x: channel%u timeout waiting for pause\n", ch
->id
);
421 static void pl08x_resume_phy_chan(struct pl08x_phy_chan
*ch
)
425 /* Clear the HALT bit */
426 val
= readl(ch
->base
+ PL080_CH_CONFIG
);
427 val
&= ~PL080_CONFIG_HALT
;
428 writel(val
, ch
->base
+ PL080_CH_CONFIG
);
432 * pl08x_terminate_phy_chan() stops the channel, clears the FIFO and
433 * clears any pending interrupt status. This should not be used for
434 * an on-going transfer, but as a method of shutting down a channel
435 * (eg, when it's no longer used) or terminating a transfer.
437 static void pl08x_terminate_phy_chan(struct pl08x_driver_data
*pl08x
,
438 struct pl08x_phy_chan
*ch
)
440 u32 val
= readl(ch
->base
+ PL080_CH_CONFIG
);
442 val
&= ~(PL080_CONFIG_ENABLE
| PL080_CONFIG_ERR_IRQ_MASK
|
443 PL080_CONFIG_TC_IRQ_MASK
);
445 writel(val
, ch
->base
+ PL080_CH_CONFIG
);
447 writel(1 << ch
->id
, pl08x
->base
+ PL080_ERR_CLEAR
);
448 writel(1 << ch
->id
, pl08x
->base
+ PL080_TC_CLEAR
);
451 static inline u32
get_bytes_in_cctl(u32 cctl
)
453 /* The source width defines the number of bytes */
454 u32 bytes
= cctl
& PL080_CONTROL_TRANSFER_SIZE_MASK
;
456 switch (cctl
>> PL080_CONTROL_SWIDTH_SHIFT
) {
457 case PL080_WIDTH_8BIT
:
459 case PL080_WIDTH_16BIT
:
462 case PL080_WIDTH_32BIT
:
469 /* The channel should be paused when calling this */
470 static u32
pl08x_getbytes_chan(struct pl08x_dma_chan
*plchan
)
472 struct pl08x_phy_chan
*ch
;
473 struct pl08x_txd
*txd
;
476 ch
= plchan
->phychan
;
480 * Follow the LLIs to get the number of remaining
481 * bytes in the currently active transaction.
484 u32 clli
= readl(ch
->base
+ PL080_CH_LLI
) & ~PL080_LLI_LM_AHB2
;
486 /* First get the remaining bytes in the active transfer */
487 bytes
= get_bytes_in_cctl(readl(ch
->base
+ PL080_CH_CONTROL
));
490 struct pl08x_lli
*llis_va
= txd
->llis_va
;
491 dma_addr_t llis_bus
= txd
->llis_bus
;
494 BUG_ON(clli
< llis_bus
|| clli
>= llis_bus
+
495 sizeof(struct pl08x_lli
) * MAX_NUM_TSFR_LLIS
);
498 * Locate the next LLI - as this is an array,
499 * it's simple maths to find.
501 index
= (clli
- llis_bus
) / sizeof(struct pl08x_lli
);
503 for (; index
< MAX_NUM_TSFR_LLIS
; index
++) {
504 bytes
+= get_bytes_in_cctl(llis_va
[index
].cctl
);
507 * A LLI pointer of 0 terminates the LLI list
509 if (!llis_va
[index
].lli
)
519 * Allocate a physical channel for a virtual channel
521 * Try to locate a physical channel to be used for this transfer. If all
522 * are taken return NULL and the requester will have to cope by using
523 * some fallback PIO mode or retrying later.
525 static struct pl08x_phy_chan
*
526 pl08x_get_phy_channel(struct pl08x_driver_data
*pl08x
,
527 struct pl08x_dma_chan
*virt_chan
)
529 struct pl08x_phy_chan
*ch
= NULL
;
533 for (i
= 0; i
< pl08x
->vd
->channels
; i
++) {
534 ch
= &pl08x
->phy_chans
[i
];
536 spin_lock_irqsave(&ch
->lock
, flags
);
538 if (!ch
->locked
&& !ch
->serving
) {
539 ch
->serving
= virt_chan
;
540 spin_unlock_irqrestore(&ch
->lock
, flags
);
544 spin_unlock_irqrestore(&ch
->lock
, flags
);
547 if (i
== pl08x
->vd
->channels
) {
548 /* No physical channel available, cope with it */
555 /* Mark the physical channel as free. Note, this write is atomic. */
556 static inline void pl08x_put_phy_channel(struct pl08x_driver_data
*pl08x
,
557 struct pl08x_phy_chan
*ch
)
563 * Try to allocate a physical channel. When successful, assign it to
564 * this virtual channel, and initiate the next descriptor. The
565 * virtual channel lock must be held at this point.
567 static void pl08x_phy_alloc_and_start(struct pl08x_dma_chan
*plchan
)
569 struct pl08x_driver_data
*pl08x
= plchan
->host
;
570 struct pl08x_phy_chan
*ch
;
572 ch
= pl08x_get_phy_channel(pl08x
, plchan
);
574 dev_dbg(&pl08x
->adev
->dev
, "no physical channel available for xfer on %s\n", plchan
->name
);
575 plchan
->state
= PL08X_CHAN_WAITING
;
579 dev_dbg(&pl08x
->adev
->dev
, "allocated physical channel %d for xfer on %s\n",
580 ch
->id
, plchan
->name
);
582 plchan
->phychan
= ch
;
583 plchan
->state
= PL08X_CHAN_RUNNING
;
584 pl08x_start_next_txd(plchan
);
587 static void pl08x_phy_reassign_start(struct pl08x_phy_chan
*ch
,
588 struct pl08x_dma_chan
*plchan
)
590 struct pl08x_driver_data
*pl08x
= plchan
->host
;
592 dev_dbg(&pl08x
->adev
->dev
, "reassigned physical channel %d for xfer on %s\n",
593 ch
->id
, plchan
->name
);
596 * We do this without taking the lock; we're really only concerned
597 * about whether this pointer is NULL or not, and we're guaranteed
598 * that this will only be called when it _already_ is non-NULL.
600 ch
->serving
= plchan
;
601 plchan
->phychan
= ch
;
602 plchan
->state
= PL08X_CHAN_RUNNING
;
603 pl08x_start_next_txd(plchan
);
607 * Free a physical DMA channel, potentially reallocating it to another
608 * virtual channel if we have any pending.
610 static void pl08x_phy_free(struct pl08x_dma_chan
*plchan
)
612 struct pl08x_driver_data
*pl08x
= plchan
->host
;
613 struct pl08x_dma_chan
*p
, *next
;
618 /* Find a waiting virtual channel for the next transfer. */
619 list_for_each_entry(p
, &pl08x
->memcpy
.channels
, vc
.chan
.device_node
)
620 if (p
->state
== PL08X_CHAN_WAITING
) {
626 list_for_each_entry(p
, &pl08x
->slave
.channels
, vc
.chan
.device_node
)
627 if (p
->state
== PL08X_CHAN_WAITING
) {
633 /* Ensure that the physical channel is stopped */
634 pl08x_terminate_phy_chan(pl08x
, plchan
->phychan
);
640 * Eww. We know this isn't going to deadlock
641 * but lockdep probably doesn't.
643 spin_lock(&next
->vc
.lock
);
644 /* Re-check the state now that we have the lock */
645 success
= next
->state
== PL08X_CHAN_WAITING
;
647 pl08x_phy_reassign_start(plchan
->phychan
, next
);
648 spin_unlock(&next
->vc
.lock
);
650 /* If the state changed, try to find another channel */
654 /* No more jobs, so free up the physical channel */
655 pl08x_put_phy_channel(pl08x
, plchan
->phychan
);
658 plchan
->phychan
= NULL
;
659 plchan
->state
= PL08X_CHAN_IDLE
;
666 static inline unsigned int pl08x_get_bytes_for_cctl(unsigned int coded
)
669 case PL080_WIDTH_8BIT
:
671 case PL080_WIDTH_16BIT
:
673 case PL080_WIDTH_32BIT
:
682 static inline u32
pl08x_cctl_bits(u32 cctl
, u8 srcwidth
, u8 dstwidth
,
687 /* Remove all src, dst and transfer size bits */
688 retbits
&= ~PL080_CONTROL_DWIDTH_MASK
;
689 retbits
&= ~PL080_CONTROL_SWIDTH_MASK
;
690 retbits
&= ~PL080_CONTROL_TRANSFER_SIZE_MASK
;
692 /* Then set the bits according to the parameters */
695 retbits
|= PL080_WIDTH_8BIT
<< PL080_CONTROL_SWIDTH_SHIFT
;
698 retbits
|= PL080_WIDTH_16BIT
<< PL080_CONTROL_SWIDTH_SHIFT
;
701 retbits
|= PL080_WIDTH_32BIT
<< PL080_CONTROL_SWIDTH_SHIFT
;
710 retbits
|= PL080_WIDTH_8BIT
<< PL080_CONTROL_DWIDTH_SHIFT
;
713 retbits
|= PL080_WIDTH_16BIT
<< PL080_CONTROL_DWIDTH_SHIFT
;
716 retbits
|= PL080_WIDTH_32BIT
<< PL080_CONTROL_DWIDTH_SHIFT
;
723 retbits
|= tsize
<< PL080_CONTROL_TRANSFER_SIZE_SHIFT
;
727 struct pl08x_lli_build_data
{
728 struct pl08x_txd
*txd
;
729 struct pl08x_bus_data srcbus
;
730 struct pl08x_bus_data dstbus
;
736 * Autoselect a master bus to use for the transfer. Slave will be the chosen as
737 * victim in case src & dest are not similarly aligned. i.e. If after aligning
738 * masters address with width requirements of transfer (by sending few byte by
739 * byte data), slave is still not aligned, then its width will be reduced to
741 * - prefers the destination bus if both available
742 * - prefers bus with fixed address (i.e. peripheral)
744 static void pl08x_choose_master_bus(struct pl08x_lli_build_data
*bd
,
745 struct pl08x_bus_data
**mbus
, struct pl08x_bus_data
**sbus
, u32 cctl
)
747 if (!(cctl
& PL080_CONTROL_DST_INCR
)) {
750 } else if (!(cctl
& PL080_CONTROL_SRC_INCR
)) {
754 if (bd
->dstbus
.buswidth
>= bd
->srcbus
.buswidth
) {
765 * Fills in one LLI for a certain transfer descriptor and advance the counter
767 static void pl08x_fill_lli_for_desc(struct pl08x_lli_build_data
*bd
,
768 int num_llis
, int len
, u32 cctl
)
770 struct pl08x_lli
*llis_va
= bd
->txd
->llis_va
;
771 dma_addr_t llis_bus
= bd
->txd
->llis_bus
;
773 BUG_ON(num_llis
>= MAX_NUM_TSFR_LLIS
);
775 llis_va
[num_llis
].cctl
= cctl
;
776 llis_va
[num_llis
].src
= bd
->srcbus
.addr
;
777 llis_va
[num_llis
].dst
= bd
->dstbus
.addr
;
778 llis_va
[num_llis
].lli
= llis_bus
+ (num_llis
+ 1) *
779 sizeof(struct pl08x_lli
);
780 llis_va
[num_llis
].lli
|= bd
->lli_bus
;
782 if (cctl
& PL080_CONTROL_SRC_INCR
)
783 bd
->srcbus
.addr
+= len
;
784 if (cctl
& PL080_CONTROL_DST_INCR
)
785 bd
->dstbus
.addr
+= len
;
787 BUG_ON(bd
->remainder
< len
);
789 bd
->remainder
-= len
;
792 static inline void prep_byte_width_lli(struct pl08x_lli_build_data
*bd
,
793 u32
*cctl
, u32 len
, int num_llis
, size_t *total_bytes
)
795 *cctl
= pl08x_cctl_bits(*cctl
, 1, 1, len
);
796 pl08x_fill_lli_for_desc(bd
, num_llis
, len
, *cctl
);
797 (*total_bytes
) += len
;
801 * This fills in the table of LLIs for the transfer descriptor
802 * Note that we assume we never have to change the burst sizes
805 static int pl08x_fill_llis_for_desc(struct pl08x_driver_data
*pl08x
,
806 struct pl08x_txd
*txd
)
808 struct pl08x_bus_data
*mbus
, *sbus
;
809 struct pl08x_lli_build_data bd
;
811 u32 cctl
, early_bytes
= 0;
812 size_t max_bytes_per_lli
, total_bytes
;
813 struct pl08x_lli
*llis_va
;
814 struct pl08x_sg
*dsg
;
816 txd
->llis_va
= dma_pool_alloc(pl08x
->pool
, GFP_NOWAIT
, &txd
->llis_bus
);
818 dev_err(&pl08x
->adev
->dev
, "%s no memory for llis\n", __func__
);
823 bd
.lli_bus
= (pl08x
->lli_buses
& PL08X_AHB2
) ? PL080_LLI_LM_AHB2
: 0;
826 /* Find maximum width of the source bus */
828 pl08x_get_bytes_for_cctl((cctl
& PL080_CONTROL_SWIDTH_MASK
) >>
829 PL080_CONTROL_SWIDTH_SHIFT
);
831 /* Find maximum width of the destination bus */
833 pl08x_get_bytes_for_cctl((cctl
& PL080_CONTROL_DWIDTH_MASK
) >>
834 PL080_CONTROL_DWIDTH_SHIFT
);
836 list_for_each_entry(dsg
, &txd
->dsg_list
, node
) {
840 bd
.srcbus
.addr
= dsg
->src_addr
;
841 bd
.dstbus
.addr
= dsg
->dst_addr
;
842 bd
.remainder
= dsg
->len
;
843 bd
.srcbus
.buswidth
= bd
.srcbus
.maxwidth
;
844 bd
.dstbus
.buswidth
= bd
.dstbus
.maxwidth
;
846 pl08x_choose_master_bus(&bd
, &mbus
, &sbus
, cctl
);
848 dev_vdbg(&pl08x
->adev
->dev
, "src=0x%08x%s/%u dst=0x%08x%s/%u len=%zu\n",
849 bd
.srcbus
.addr
, cctl
& PL080_CONTROL_SRC_INCR
? "+" : "",
851 bd
.dstbus
.addr
, cctl
& PL080_CONTROL_DST_INCR
? "+" : "",
854 dev_vdbg(&pl08x
->adev
->dev
, "mbus=%s sbus=%s\n",
855 mbus
== &bd
.srcbus
? "src" : "dst",
856 sbus
== &bd
.srcbus
? "src" : "dst");
859 * Zero length is only allowed if all these requirements are
861 * - flow controller is peripheral.
862 * - src.addr is aligned to src.width
863 * - dst.addr is aligned to dst.width
865 * sg_len == 1 should be true, as there can be two cases here:
867 * - Memory addresses are contiguous and are not scattered.
868 * Here, Only one sg will be passed by user driver, with
869 * memory address and zero length. We pass this to controller
870 * and after the transfer it will receive the last burst
871 * request from peripheral and so transfer finishes.
873 * - Memory addresses are scattered and are not contiguous.
874 * Here, Obviously as DMA controller doesn't know when a lli's
875 * transfer gets over, it can't load next lli. So in this
876 * case, there has to be an assumption that only one lli is
877 * supported. Thus, we can't have scattered addresses.
880 u32 fc
= (txd
->ccfg
& PL080_CONFIG_FLOW_CONTROL_MASK
) >>
881 PL080_CONFIG_FLOW_CONTROL_SHIFT
;
882 if (!((fc
>= PL080_FLOW_SRC2DST_DST
) &&
883 (fc
<= PL080_FLOW_SRC2DST_SRC
))) {
884 dev_err(&pl08x
->adev
->dev
, "%s sg len can't be zero",
889 if ((bd
.srcbus
.addr
% bd
.srcbus
.buswidth
) ||
890 (bd
.dstbus
.addr
% bd
.dstbus
.buswidth
)) {
891 dev_err(&pl08x
->adev
->dev
,
892 "%s src & dst address must be aligned to src"
893 " & dst width if peripheral is flow controller",
898 cctl
= pl08x_cctl_bits(cctl
, bd
.srcbus
.buswidth
,
899 bd
.dstbus
.buswidth
, 0);
900 pl08x_fill_lli_for_desc(&bd
, num_llis
++, 0, cctl
);
905 * Send byte by byte for following cases
906 * - Less than a bus width available
907 * - until master bus is aligned
909 if (bd
.remainder
< mbus
->buswidth
)
910 early_bytes
= bd
.remainder
;
911 else if ((mbus
->addr
) % (mbus
->buswidth
)) {
912 early_bytes
= mbus
->buswidth
- (mbus
->addr
) %
914 if ((bd
.remainder
- early_bytes
) < mbus
->buswidth
)
915 early_bytes
= bd
.remainder
;
919 dev_vdbg(&pl08x
->adev
->dev
,
920 "%s byte width LLIs (remain 0x%08x)\n",
921 __func__
, bd
.remainder
);
922 prep_byte_width_lli(&bd
, &cctl
, early_bytes
, num_llis
++,
929 * - if slave is not then we must set its width down
931 if (sbus
->addr
% sbus
->buswidth
) {
932 dev_dbg(&pl08x
->adev
->dev
,
933 "%s set down bus width to one byte\n",
940 * Bytes transferred = tsize * src width, not
943 max_bytes_per_lli
= bd
.srcbus
.buswidth
*
944 PL080_CONTROL_TRANSFER_SIZE_MASK
;
945 dev_vdbg(&pl08x
->adev
->dev
,
946 "%s max bytes per lli = %zu\n",
947 __func__
, max_bytes_per_lli
);
950 * Make largest possible LLIs until less than one bus
953 while (bd
.remainder
> (mbus
->buswidth
- 1)) {
954 size_t lli_len
, tsize
, width
;
957 * If enough left try to send max possible,
958 * otherwise try to send the remainder
960 lli_len
= min(bd
.remainder
, max_bytes_per_lli
);
963 * Check against maximum bus alignment:
964 * Calculate actual transfer size in relation to
965 * bus width an get a maximum remainder of the
966 * highest bus width - 1
968 width
= max(mbus
->buswidth
, sbus
->buswidth
);
969 lli_len
= (lli_len
/ width
) * width
;
970 tsize
= lli_len
/ bd
.srcbus
.buswidth
;
972 dev_vdbg(&pl08x
->adev
->dev
,
973 "%s fill lli with single lli chunk of "
974 "size 0x%08zx (remainder 0x%08zx)\n",
975 __func__
, lli_len
, bd
.remainder
);
977 cctl
= pl08x_cctl_bits(cctl
, bd
.srcbus
.buswidth
,
978 bd
.dstbus
.buswidth
, tsize
);
979 pl08x_fill_lli_for_desc(&bd
, num_llis
++,
981 total_bytes
+= lli_len
;
988 dev_vdbg(&pl08x
->adev
->dev
,
989 "%s align with boundary, send odd bytes (remain %zu)\n",
990 __func__
, bd
.remainder
);
991 prep_byte_width_lli(&bd
, &cctl
, bd
.remainder
,
992 num_llis
++, &total_bytes
);
996 if (total_bytes
!= dsg
->len
) {
997 dev_err(&pl08x
->adev
->dev
,
998 "%s size of encoded lli:s don't match total txd, transferred 0x%08zx from size 0x%08zx\n",
999 __func__
, total_bytes
, dsg
->len
);
1003 if (num_llis
>= MAX_NUM_TSFR_LLIS
) {
1004 dev_err(&pl08x
->adev
->dev
,
1005 "%s need to increase MAX_NUM_TSFR_LLIS from 0x%08x\n",
1006 __func__
, (u32
) MAX_NUM_TSFR_LLIS
);
1011 llis_va
= txd
->llis_va
;
1012 /* The final LLI terminates the LLI. */
1013 llis_va
[num_llis
- 1].lli
= 0;
1014 /* The final LLI element shall also fire an interrupt. */
1015 llis_va
[num_llis
- 1].cctl
|= PL080_CONTROL_TC_IRQ_EN
;
1017 #ifdef VERBOSE_DEBUG
1021 dev_vdbg(&pl08x
->adev
->dev
,
1022 "%-3s %-9s %-10s %-10s %-10s %s\n",
1023 "lli", "", "csrc", "cdst", "clli", "cctl");
1024 for (i
= 0; i
< num_llis
; i
++) {
1025 dev_vdbg(&pl08x
->adev
->dev
,
1026 "%3d @%p: 0x%08x 0x%08x 0x%08x 0x%08x\n",
1027 i
, &llis_va
[i
], llis_va
[i
].src
,
1028 llis_va
[i
].dst
, llis_va
[i
].lli
, llis_va
[i
].cctl
1037 static void pl08x_free_txd(struct pl08x_driver_data
*pl08x
,
1038 struct pl08x_txd
*txd
)
1040 struct pl08x_sg
*dsg
, *_dsg
;
1043 dma_pool_free(pl08x
->pool
, txd
->llis_va
, txd
->llis_bus
);
1045 list_for_each_entry_safe(dsg
, _dsg
, &txd
->dsg_list
, node
) {
1046 list_del(&dsg
->node
);
1053 static void pl08x_unmap_buffers(struct pl08x_txd
*txd
)
1055 struct device
*dev
= txd
->vd
.tx
.chan
->device
->dev
;
1056 struct pl08x_sg
*dsg
;
1058 if (!(txd
->vd
.tx
.flags
& DMA_COMPL_SKIP_SRC_UNMAP
)) {
1059 if (txd
->vd
.tx
.flags
& DMA_COMPL_SRC_UNMAP_SINGLE
)
1060 list_for_each_entry(dsg
, &txd
->dsg_list
, node
)
1061 dma_unmap_single(dev
, dsg
->src_addr
, dsg
->len
,
1064 list_for_each_entry(dsg
, &txd
->dsg_list
, node
)
1065 dma_unmap_page(dev
, dsg
->src_addr
, dsg
->len
,
1069 if (!(txd
->vd
.tx
.flags
& DMA_COMPL_SKIP_DEST_UNMAP
)) {
1070 if (txd
->vd
.tx
.flags
& DMA_COMPL_DEST_UNMAP_SINGLE
)
1071 list_for_each_entry(dsg
, &txd
->dsg_list
, node
)
1072 dma_unmap_single(dev
, dsg
->dst_addr
, dsg
->len
,
1075 list_for_each_entry(dsg
, &txd
->dsg_list
, node
)
1076 dma_unmap_page(dev
, dsg
->dst_addr
, dsg
->len
,
1081 static void pl08x_desc_free(struct virt_dma_desc
*vd
)
1083 struct pl08x_txd
*txd
= to_pl08x_txd(&vd
->tx
);
1084 struct pl08x_dma_chan
*plchan
= to_pl08x_chan(vd
->tx
.chan
);
1087 pl08x_unmap_buffers(txd
);
1090 pl08x_release_mux(plchan
);
1092 pl08x_free_txd(plchan
->host
, txd
);
1095 static void pl08x_free_txd_list(struct pl08x_driver_data
*pl08x
,
1096 struct pl08x_dma_chan
*plchan
)
1099 struct pl08x_txd
*txd
;
1101 vchan_get_all_descriptors(&plchan
->vc
, &head
);
1103 while (!list_empty(&head
)) {
1104 txd
= list_first_entry(&head
, struct pl08x_txd
, vd
.node
);
1105 list_del(&txd
->vd
.node
);
1106 pl08x_desc_free(&txd
->vd
);
1111 * The DMA ENGINE API
1113 static int pl08x_alloc_chan_resources(struct dma_chan
*chan
)
1118 static void pl08x_free_chan_resources(struct dma_chan
*chan
)
1120 /* Ensure all queued descriptors are freed */
1121 vchan_free_chan_resources(to_virt_chan(chan
));
1124 static struct dma_async_tx_descriptor
*pl08x_prep_dma_interrupt(
1125 struct dma_chan
*chan
, unsigned long flags
)
1127 struct dma_async_tx_descriptor
*retval
= NULL
;
1133 * Code accessing dma_async_is_complete() in a tight loop may give problems.
1134 * If slaves are relying on interrupts to signal completion this function
1135 * must not be called with interrupts disabled.
1137 static enum dma_status
pl08x_dma_tx_status(struct dma_chan
*chan
,
1138 dma_cookie_t cookie
, struct dma_tx_state
*txstate
)
1140 struct pl08x_dma_chan
*plchan
= to_pl08x_chan(chan
);
1141 struct virt_dma_desc
*vd
;
1142 unsigned long flags
;
1143 enum dma_status ret
;
1146 ret
= dma_cookie_status(chan
, cookie
, txstate
);
1147 if (ret
== DMA_SUCCESS
)
1151 * There's no point calculating the residue if there's
1152 * no txstate to store the value.
1155 if (plchan
->state
== PL08X_CHAN_PAUSED
)
1160 spin_lock_irqsave(&plchan
->vc
.lock
, flags
);
1161 ret
= dma_cookie_status(chan
, cookie
, txstate
);
1162 if (ret
!= DMA_SUCCESS
) {
1163 vd
= vchan_find_desc(&plchan
->vc
, cookie
);
1165 /* On the issued list, so hasn't been processed yet */
1166 struct pl08x_txd
*txd
= to_pl08x_txd(&vd
->tx
);
1167 struct pl08x_sg
*dsg
;
1169 list_for_each_entry(dsg
, &txd
->dsg_list
, node
)
1172 bytes
= pl08x_getbytes_chan(plchan
);
1175 spin_unlock_irqrestore(&plchan
->vc
.lock
, flags
);
1178 * This cookie not complete yet
1179 * Get number of bytes left in the active transactions and queue
1181 dma_set_residue(txstate
, bytes
);
1183 if (plchan
->state
== PL08X_CHAN_PAUSED
&& ret
== DMA_IN_PROGRESS
)
1186 /* Whether waiting or running, we're in progress */
1190 /* PrimeCell DMA extension */
1191 struct burst_table
{
1196 static const struct burst_table burst_sizes
[] = {
1199 .reg
= PL080_BSIZE_256
,
1203 .reg
= PL080_BSIZE_128
,
1207 .reg
= PL080_BSIZE_64
,
1211 .reg
= PL080_BSIZE_32
,
1215 .reg
= PL080_BSIZE_16
,
1219 .reg
= PL080_BSIZE_8
,
1223 .reg
= PL080_BSIZE_4
,
1227 .reg
= PL080_BSIZE_1
,
1232 * Given the source and destination available bus masks, select which
1233 * will be routed to each port. We try to have source and destination
1234 * on separate ports, but always respect the allowable settings.
1236 static u32
pl08x_select_bus(u8 src
, u8 dst
)
1240 if (!(dst
& PL08X_AHB1
) || ((dst
& PL08X_AHB2
) && (src
& PL08X_AHB1
)))
1241 cctl
|= PL080_CONTROL_DST_AHB2
;
1242 if (!(src
& PL08X_AHB1
) || ((src
& PL08X_AHB2
) && !(dst
& PL08X_AHB2
)))
1243 cctl
|= PL080_CONTROL_SRC_AHB2
;
1248 static u32
pl08x_cctl(u32 cctl
)
1250 cctl
&= ~(PL080_CONTROL_SRC_AHB2
| PL080_CONTROL_DST_AHB2
|
1251 PL080_CONTROL_SRC_INCR
| PL080_CONTROL_DST_INCR
|
1252 PL080_CONTROL_PROT_MASK
);
1254 /* Access the cell in privileged mode, non-bufferable, non-cacheable */
1255 return cctl
| PL080_CONTROL_PROT_SYS
;
1258 static u32
pl08x_width(enum dma_slave_buswidth width
)
1261 case DMA_SLAVE_BUSWIDTH_1_BYTE
:
1262 return PL080_WIDTH_8BIT
;
1263 case DMA_SLAVE_BUSWIDTH_2_BYTES
:
1264 return PL080_WIDTH_16BIT
;
1265 case DMA_SLAVE_BUSWIDTH_4_BYTES
:
1266 return PL080_WIDTH_32BIT
;
1272 static u32
pl08x_burst(u32 maxburst
)
1276 for (i
= 0; i
< ARRAY_SIZE(burst_sizes
); i
++)
1277 if (burst_sizes
[i
].burstwords
<= maxburst
)
1280 return burst_sizes
[i
].reg
;
1283 static u32
pl08x_get_cctl(struct pl08x_dma_chan
*plchan
,
1284 enum dma_slave_buswidth addr_width
, u32 maxburst
)
1286 u32 width
, burst
, cctl
= 0;
1288 width
= pl08x_width(addr_width
);
1292 cctl
|= width
<< PL080_CONTROL_SWIDTH_SHIFT
;
1293 cctl
|= width
<< PL080_CONTROL_DWIDTH_SHIFT
;
1296 * If this channel will only request single transfers, set this
1297 * down to ONE element. Also select one element if no maxburst
1300 if (plchan
->cd
->single
)
1303 burst
= pl08x_burst(maxburst
);
1304 cctl
|= burst
<< PL080_CONTROL_SB_SIZE_SHIFT
;
1305 cctl
|= burst
<< PL080_CONTROL_DB_SIZE_SHIFT
;
1307 return pl08x_cctl(cctl
);
1310 static int dma_set_runtime_config(struct dma_chan
*chan
,
1311 struct dma_slave_config
*config
)
1313 struct pl08x_dma_chan
*plchan
= to_pl08x_chan(chan
);
1318 /* Reject definitely invalid configurations */
1319 if (config
->src_addr_width
== DMA_SLAVE_BUSWIDTH_8_BYTES
||
1320 config
->dst_addr_width
== DMA_SLAVE_BUSWIDTH_8_BYTES
)
1323 plchan
->cfg
= *config
;
1329 * Slave transactions callback to the slave device to allow
1330 * synchronization of slave DMA signals with the DMAC enable
1332 static void pl08x_issue_pending(struct dma_chan
*chan
)
1334 struct pl08x_dma_chan
*plchan
= to_pl08x_chan(chan
);
1335 unsigned long flags
;
1337 spin_lock_irqsave(&plchan
->vc
.lock
, flags
);
1338 if (vchan_issue_pending(&plchan
->vc
)) {
1339 if (!plchan
->phychan
&& plchan
->state
!= PL08X_CHAN_WAITING
)
1340 pl08x_phy_alloc_and_start(plchan
);
1342 spin_unlock_irqrestore(&plchan
->vc
.lock
, flags
);
1345 static struct pl08x_txd
*pl08x_get_txd(struct pl08x_dma_chan
*plchan
)
1347 struct pl08x_txd
*txd
= kzalloc(sizeof(*txd
), GFP_NOWAIT
);
1350 INIT_LIST_HEAD(&txd
->dsg_list
);
1352 /* Always enable error and terminal interrupts */
1353 txd
->ccfg
= PL080_CONFIG_ERR_IRQ_MASK
|
1354 PL080_CONFIG_TC_IRQ_MASK
;
1360 * Initialize a descriptor to be used by memcpy submit
1362 static struct dma_async_tx_descriptor
*pl08x_prep_dma_memcpy(
1363 struct dma_chan
*chan
, dma_addr_t dest
, dma_addr_t src
,
1364 size_t len
, unsigned long flags
)
1366 struct pl08x_dma_chan
*plchan
= to_pl08x_chan(chan
);
1367 struct pl08x_driver_data
*pl08x
= plchan
->host
;
1368 struct pl08x_txd
*txd
;
1369 struct pl08x_sg
*dsg
;
1372 txd
= pl08x_get_txd(plchan
);
1374 dev_err(&pl08x
->adev
->dev
,
1375 "%s no memory for descriptor\n", __func__
);
1379 dsg
= kzalloc(sizeof(struct pl08x_sg
), GFP_NOWAIT
);
1381 pl08x_free_txd(pl08x
, txd
);
1382 dev_err(&pl08x
->adev
->dev
, "%s no memory for pl080 sg\n",
1386 list_add_tail(&dsg
->node
, &txd
->dsg_list
);
1388 dsg
->src_addr
= src
;
1389 dsg
->dst_addr
= dest
;
1392 /* Set platform data for m2m */
1393 txd
->ccfg
|= PL080_FLOW_MEM2MEM
<< PL080_CONFIG_FLOW_CONTROL_SHIFT
;
1394 txd
->cctl
= pl08x
->pd
->memcpy_channel
.cctl_memcpy
&
1395 ~(PL080_CONTROL_DST_AHB2
| PL080_CONTROL_SRC_AHB2
);
1397 /* Both to be incremented or the code will break */
1398 txd
->cctl
|= PL080_CONTROL_SRC_INCR
| PL080_CONTROL_DST_INCR
;
1400 if (pl08x
->vd
->dualmaster
)
1401 txd
->cctl
|= pl08x_select_bus(pl08x
->mem_buses
,
1404 ret
= pl08x_fill_llis_for_desc(plchan
->host
, txd
);
1406 pl08x_free_txd(pl08x
, txd
);
1410 return vchan_tx_prep(&plchan
->vc
, &txd
->vd
, flags
);
1413 static struct dma_async_tx_descriptor
*pl08x_prep_slave_sg(
1414 struct dma_chan
*chan
, struct scatterlist
*sgl
,
1415 unsigned int sg_len
, enum dma_transfer_direction direction
,
1416 unsigned long flags
, void *context
)
1418 struct pl08x_dma_chan
*plchan
= to_pl08x_chan(chan
);
1419 struct pl08x_driver_data
*pl08x
= plchan
->host
;
1420 struct pl08x_txd
*txd
;
1421 struct pl08x_sg
*dsg
;
1422 struct scatterlist
*sg
;
1423 enum dma_slave_buswidth addr_width
;
1424 dma_addr_t slave_addr
;
1426 u8 src_buses
, dst_buses
;
1429 dev_dbg(&pl08x
->adev
->dev
, "%s prepare transaction of %d bytes from %s\n",
1430 __func__
, sg_dma_len(sgl
), plchan
->name
);
1432 txd
= pl08x_get_txd(plchan
);
1434 dev_err(&pl08x
->adev
->dev
, "%s no txd\n", __func__
);
1439 * Set up addresses, the PrimeCell configured address
1440 * will take precedence since this may configure the
1441 * channel target address dynamically at runtime.
1443 if (direction
== DMA_MEM_TO_DEV
) {
1444 cctl
= PL080_CONTROL_SRC_INCR
;
1445 slave_addr
= plchan
->cfg
.dst_addr
;
1446 addr_width
= plchan
->cfg
.dst_addr_width
;
1447 maxburst
= plchan
->cfg
.dst_maxburst
;
1448 src_buses
= pl08x
->mem_buses
;
1449 dst_buses
= plchan
->cd
->periph_buses
;
1450 } else if (direction
== DMA_DEV_TO_MEM
) {
1451 cctl
= PL080_CONTROL_DST_INCR
;
1452 slave_addr
= plchan
->cfg
.src_addr
;
1453 addr_width
= plchan
->cfg
.src_addr_width
;
1454 maxburst
= plchan
->cfg
.src_maxburst
;
1455 src_buses
= plchan
->cd
->periph_buses
;
1456 dst_buses
= pl08x
->mem_buses
;
1458 pl08x_free_txd(pl08x
, txd
);
1459 dev_err(&pl08x
->adev
->dev
,
1460 "%s direction unsupported\n", __func__
);
1464 cctl
|= pl08x_get_cctl(plchan
, addr_width
, maxburst
);
1466 pl08x_free_txd(pl08x
, txd
);
1467 dev_err(&pl08x
->adev
->dev
,
1468 "DMA slave configuration botched?\n");
1472 txd
->cctl
= cctl
| pl08x_select_bus(src_buses
, dst_buses
);
1474 if (plchan
->cfg
.device_fc
)
1475 tmp
= (direction
== DMA_MEM_TO_DEV
) ? PL080_FLOW_MEM2PER_PER
:
1476 PL080_FLOW_PER2MEM_PER
;
1478 tmp
= (direction
== DMA_MEM_TO_DEV
) ? PL080_FLOW_MEM2PER
:
1481 txd
->ccfg
|= tmp
<< PL080_CONFIG_FLOW_CONTROL_SHIFT
;
1483 ret
= pl08x_request_mux(plchan
);
1485 pl08x_free_txd(pl08x
, txd
);
1486 dev_dbg(&pl08x
->adev
->dev
,
1487 "unable to mux for transfer on %s due to platform restrictions\n",
1492 dev_dbg(&pl08x
->adev
->dev
, "allocated DMA request signal %d for xfer on %s\n",
1493 plchan
->signal
, plchan
->name
);
1495 /* Assign the flow control signal to this channel */
1496 if (direction
== DMA_MEM_TO_DEV
)
1497 txd
->ccfg
|= plchan
->signal
<< PL080_CONFIG_DST_SEL_SHIFT
;
1499 txd
->ccfg
|= plchan
->signal
<< PL080_CONFIG_SRC_SEL_SHIFT
;
1501 for_each_sg(sgl
, sg
, sg_len
, tmp
) {
1502 dsg
= kzalloc(sizeof(struct pl08x_sg
), GFP_NOWAIT
);
1504 pl08x_release_mux(plchan
);
1505 pl08x_free_txd(pl08x
, txd
);
1506 dev_err(&pl08x
->adev
->dev
, "%s no mem for pl080 sg\n",
1510 list_add_tail(&dsg
->node
, &txd
->dsg_list
);
1512 dsg
->len
= sg_dma_len(sg
);
1513 if (direction
== DMA_MEM_TO_DEV
) {
1514 dsg
->src_addr
= sg_dma_address(sg
);
1515 dsg
->dst_addr
= slave_addr
;
1517 dsg
->src_addr
= slave_addr
;
1518 dsg
->dst_addr
= sg_dma_address(sg
);
1522 ret
= pl08x_fill_llis_for_desc(plchan
->host
, txd
);
1524 pl08x_release_mux(plchan
);
1525 pl08x_free_txd(pl08x
, txd
);
1529 return vchan_tx_prep(&plchan
->vc
, &txd
->vd
, flags
);
1532 static int pl08x_control(struct dma_chan
*chan
, enum dma_ctrl_cmd cmd
,
1535 struct pl08x_dma_chan
*plchan
= to_pl08x_chan(chan
);
1536 struct pl08x_driver_data
*pl08x
= plchan
->host
;
1537 unsigned long flags
;
1540 /* Controls applicable to inactive channels */
1541 if (cmd
== DMA_SLAVE_CONFIG
) {
1542 return dma_set_runtime_config(chan
,
1543 (struct dma_slave_config
*)arg
);
1547 * Anything succeeds on channels with no physical allocation and
1548 * no queued transfers.
1550 spin_lock_irqsave(&plchan
->vc
.lock
, flags
);
1551 if (!plchan
->phychan
&& !plchan
->at
) {
1552 spin_unlock_irqrestore(&plchan
->vc
.lock
, flags
);
1557 case DMA_TERMINATE_ALL
:
1558 plchan
->state
= PL08X_CHAN_IDLE
;
1560 if (plchan
->phychan
) {
1562 * Mark physical channel as free and free any slave
1565 pl08x_phy_free(plchan
);
1567 /* Dequeue jobs and free LLIs */
1569 pl08x_desc_free(&plchan
->at
->vd
);
1572 /* Dequeue jobs not yet fired as well */
1573 pl08x_free_txd_list(pl08x
, plchan
);
1576 pl08x_pause_phy_chan(plchan
->phychan
);
1577 plchan
->state
= PL08X_CHAN_PAUSED
;
1580 pl08x_resume_phy_chan(plchan
->phychan
);
1581 plchan
->state
= PL08X_CHAN_RUNNING
;
1584 /* Unknown command */
1589 spin_unlock_irqrestore(&plchan
->vc
.lock
, flags
);
1594 bool pl08x_filter_id(struct dma_chan
*chan
, void *chan_id
)
1596 struct pl08x_dma_chan
*plchan
;
1597 char *name
= chan_id
;
1599 /* Reject channels for devices not bound to this driver */
1600 if (chan
->device
->dev
->driver
!= &pl08x_amba_driver
.drv
)
1603 plchan
= to_pl08x_chan(chan
);
1605 /* Check that the channel is not taken! */
1606 if (!strcmp(plchan
->name
, name
))
1613 * Just check that the device is there and active
1614 * TODO: turn this bit on/off depending on the number of physical channels
1615 * actually used, if it is zero... well shut it off. That will save some
1616 * power. Cut the clock at the same time.
1618 static void pl08x_ensure_on(struct pl08x_driver_data
*pl08x
)
1620 /* The Nomadik variant does not have the config register */
1621 if (pl08x
->vd
->nomadik
)
1623 writel(PL080_CONFIG_ENABLE
, pl08x
->base
+ PL080_CONFIG
);
1626 static irqreturn_t
pl08x_irq(int irq
, void *dev
)
1628 struct pl08x_driver_data
*pl08x
= dev
;
1629 u32 mask
= 0, err
, tc
, i
;
1631 /* check & clear - ERR & TC interrupts */
1632 err
= readl(pl08x
->base
+ PL080_ERR_STATUS
);
1634 dev_err(&pl08x
->adev
->dev
, "%s error interrupt, register value 0x%08x\n",
1636 writel(err
, pl08x
->base
+ PL080_ERR_CLEAR
);
1638 tc
= readl(pl08x
->base
+ PL080_TC_STATUS
);
1640 writel(tc
, pl08x
->base
+ PL080_TC_CLEAR
);
1645 for (i
= 0; i
< pl08x
->vd
->channels
; i
++) {
1646 if (((1 << i
) & err
) || ((1 << i
) & tc
)) {
1647 /* Locate physical channel */
1648 struct pl08x_phy_chan
*phychan
= &pl08x
->phy_chans
[i
];
1649 struct pl08x_dma_chan
*plchan
= phychan
->serving
;
1650 struct pl08x_txd
*tx
;
1653 dev_err(&pl08x
->adev
->dev
,
1654 "%s Error TC interrupt on unused channel: 0x%08x\n",
1659 spin_lock(&plchan
->vc
.lock
);
1664 * This descriptor is done, release its mux
1667 pl08x_release_mux(plchan
);
1669 vchan_cookie_complete(&tx
->vd
);
1672 * And start the next descriptor (if any),
1673 * otherwise free this channel.
1675 if (vchan_next_desc(&plchan
->vc
))
1676 pl08x_start_next_txd(plchan
);
1678 pl08x_phy_free(plchan
);
1680 spin_unlock(&plchan
->vc
.lock
);
1686 return mask
? IRQ_HANDLED
: IRQ_NONE
;
1689 static void pl08x_dma_slave_init(struct pl08x_dma_chan
*chan
)
1692 chan
->name
= chan
->cd
->bus_id
;
1693 chan
->cfg
.src_addr
= chan
->cd
->addr
;
1694 chan
->cfg
.dst_addr
= chan
->cd
->addr
;
1698 * Initialise the DMAC memcpy/slave channels.
1699 * Make a local wrapper to hold required data
1701 static int pl08x_dma_init_virtual_channels(struct pl08x_driver_data
*pl08x
,
1702 struct dma_device
*dmadev
, unsigned int channels
, bool slave
)
1704 struct pl08x_dma_chan
*chan
;
1707 INIT_LIST_HEAD(&dmadev
->channels
);
1710 * Register as many many memcpy as we have physical channels,
1711 * we won't always be able to use all but the code will have
1712 * to cope with that situation.
1714 for (i
= 0; i
< channels
; i
++) {
1715 chan
= kzalloc(sizeof(*chan
), GFP_KERNEL
);
1717 dev_err(&pl08x
->adev
->dev
,
1718 "%s no memory for channel\n", __func__
);
1723 chan
->state
= PL08X_CHAN_IDLE
;
1727 chan
->cd
= &pl08x
->pd
->slave_channels
[i
];
1728 pl08x_dma_slave_init(chan
);
1730 chan
->cd
= &pl08x
->pd
->memcpy_channel
;
1731 chan
->name
= kasprintf(GFP_KERNEL
, "memcpy%d", i
);
1737 dev_dbg(&pl08x
->adev
->dev
,
1738 "initialize virtual channel \"%s\"\n",
1741 chan
->vc
.desc_free
= pl08x_desc_free
;
1742 vchan_init(&chan
->vc
, dmadev
);
1744 dev_info(&pl08x
->adev
->dev
, "initialized %d virtual %s channels\n",
1745 i
, slave
? "slave" : "memcpy");
1749 static void pl08x_free_virtual_channels(struct dma_device
*dmadev
)
1751 struct pl08x_dma_chan
*chan
= NULL
;
1752 struct pl08x_dma_chan
*next
;
1754 list_for_each_entry_safe(chan
,
1755 next
, &dmadev
->channels
, vc
.chan
.device_node
) {
1756 list_del(&chan
->vc
.chan
.device_node
);
1761 #ifdef CONFIG_DEBUG_FS
1762 static const char *pl08x_state_str(enum pl08x_dma_chan_state state
)
1765 case PL08X_CHAN_IDLE
:
1767 case PL08X_CHAN_RUNNING
:
1769 case PL08X_CHAN_PAUSED
:
1771 case PL08X_CHAN_WAITING
:
1776 return "UNKNOWN STATE";
1779 static int pl08x_debugfs_show(struct seq_file
*s
, void *data
)
1781 struct pl08x_driver_data
*pl08x
= s
->private;
1782 struct pl08x_dma_chan
*chan
;
1783 struct pl08x_phy_chan
*ch
;
1784 unsigned long flags
;
1787 seq_printf(s
, "PL08x physical channels:\n");
1788 seq_printf(s
, "CHANNEL:\tUSER:\n");
1789 seq_printf(s
, "--------\t-----\n");
1790 for (i
= 0; i
< pl08x
->vd
->channels
; i
++) {
1791 struct pl08x_dma_chan
*virt_chan
;
1793 ch
= &pl08x
->phy_chans
[i
];
1795 spin_lock_irqsave(&ch
->lock
, flags
);
1796 virt_chan
= ch
->serving
;
1798 seq_printf(s
, "%d\t\t%s%s\n",
1800 virt_chan
? virt_chan
->name
: "(none)",
1801 ch
->locked
? " LOCKED" : "");
1803 spin_unlock_irqrestore(&ch
->lock
, flags
);
1806 seq_printf(s
, "\nPL08x virtual memcpy channels:\n");
1807 seq_printf(s
, "CHANNEL:\tSTATE:\n");
1808 seq_printf(s
, "--------\t------\n");
1809 list_for_each_entry(chan
, &pl08x
->memcpy
.channels
, vc
.chan
.device_node
) {
1810 seq_printf(s
, "%s\t\t%s\n", chan
->name
,
1811 pl08x_state_str(chan
->state
));
1814 seq_printf(s
, "\nPL08x virtual slave channels:\n");
1815 seq_printf(s
, "CHANNEL:\tSTATE:\n");
1816 seq_printf(s
, "--------\t------\n");
1817 list_for_each_entry(chan
, &pl08x
->slave
.channels
, vc
.chan
.device_node
) {
1818 seq_printf(s
, "%s\t\t%s\n", chan
->name
,
1819 pl08x_state_str(chan
->state
));
1825 static int pl08x_debugfs_open(struct inode
*inode
, struct file
*file
)
1827 return single_open(file
, pl08x_debugfs_show
, inode
->i_private
);
1830 static const struct file_operations pl08x_debugfs_operations
= {
1831 .open
= pl08x_debugfs_open
,
1833 .llseek
= seq_lseek
,
1834 .release
= single_release
,
1837 static void init_pl08x_debugfs(struct pl08x_driver_data
*pl08x
)
1839 /* Expose a simple debugfs interface to view all clocks */
1840 (void) debugfs_create_file(dev_name(&pl08x
->adev
->dev
),
1841 S_IFREG
| S_IRUGO
, NULL
, pl08x
,
1842 &pl08x_debugfs_operations
);
1846 static inline void init_pl08x_debugfs(struct pl08x_driver_data
*pl08x
)
1851 static int pl08x_probe(struct amba_device
*adev
, const struct amba_id
*id
)
1853 struct pl08x_driver_data
*pl08x
;
1854 const struct vendor_data
*vd
= id
->data
;
1858 ret
= amba_request_regions(adev
, NULL
);
1862 /* Create the driver state holder */
1863 pl08x
= kzalloc(sizeof(*pl08x
), GFP_KERNEL
);
1869 /* Initialize memcpy engine */
1870 dma_cap_set(DMA_MEMCPY
, pl08x
->memcpy
.cap_mask
);
1871 pl08x
->memcpy
.dev
= &adev
->dev
;
1872 pl08x
->memcpy
.device_alloc_chan_resources
= pl08x_alloc_chan_resources
;
1873 pl08x
->memcpy
.device_free_chan_resources
= pl08x_free_chan_resources
;
1874 pl08x
->memcpy
.device_prep_dma_memcpy
= pl08x_prep_dma_memcpy
;
1875 pl08x
->memcpy
.device_prep_dma_interrupt
= pl08x_prep_dma_interrupt
;
1876 pl08x
->memcpy
.device_tx_status
= pl08x_dma_tx_status
;
1877 pl08x
->memcpy
.device_issue_pending
= pl08x_issue_pending
;
1878 pl08x
->memcpy
.device_control
= pl08x_control
;
1880 /* Initialize slave engine */
1881 dma_cap_set(DMA_SLAVE
, pl08x
->slave
.cap_mask
);
1882 pl08x
->slave
.dev
= &adev
->dev
;
1883 pl08x
->slave
.device_alloc_chan_resources
= pl08x_alloc_chan_resources
;
1884 pl08x
->slave
.device_free_chan_resources
= pl08x_free_chan_resources
;
1885 pl08x
->slave
.device_prep_dma_interrupt
= pl08x_prep_dma_interrupt
;
1886 pl08x
->slave
.device_tx_status
= pl08x_dma_tx_status
;
1887 pl08x
->slave
.device_issue_pending
= pl08x_issue_pending
;
1888 pl08x
->slave
.device_prep_slave_sg
= pl08x_prep_slave_sg
;
1889 pl08x
->slave
.device_control
= pl08x_control
;
1891 /* Get the platform data */
1892 pl08x
->pd
= dev_get_platdata(&adev
->dev
);
1894 dev_err(&adev
->dev
, "no platform data supplied\n");
1896 goto out_no_platdata
;
1899 /* Assign useful pointers to the driver state */
1903 /* By default, AHB1 only. If dualmaster, from platform */
1904 pl08x
->lli_buses
= PL08X_AHB1
;
1905 pl08x
->mem_buses
= PL08X_AHB1
;
1906 if (pl08x
->vd
->dualmaster
) {
1907 pl08x
->lli_buses
= pl08x
->pd
->lli_buses
;
1908 pl08x
->mem_buses
= pl08x
->pd
->mem_buses
;
1911 /* A DMA memory pool for LLIs, align on 1-byte boundary */
1912 pl08x
->pool
= dma_pool_create(DRIVER_NAME
, &pl08x
->adev
->dev
,
1913 PL08X_LLI_TSFR_SIZE
, PL08X_ALIGN
, 0);
1916 goto out_no_lli_pool
;
1919 pl08x
->base
= ioremap(adev
->res
.start
, resource_size(&adev
->res
));
1922 goto out_no_ioremap
;
1925 /* Turn on the PL08x */
1926 pl08x_ensure_on(pl08x
);
1928 /* Attach the interrupt handler */
1929 writel(0x000000FF, pl08x
->base
+ PL080_ERR_CLEAR
);
1930 writel(0x000000FF, pl08x
->base
+ PL080_TC_CLEAR
);
1932 ret
= request_irq(adev
->irq
[0], pl08x_irq
, IRQF_DISABLED
,
1933 DRIVER_NAME
, pl08x
);
1935 dev_err(&adev
->dev
, "%s failed to request interrupt %d\n",
1936 __func__
, adev
->irq
[0]);
1940 /* Initialize physical channels */
1941 pl08x
->phy_chans
= kzalloc((vd
->channels
* sizeof(*pl08x
->phy_chans
)),
1943 if (!pl08x
->phy_chans
) {
1944 dev_err(&adev
->dev
, "%s failed to allocate "
1945 "physical channel holders\n",
1948 goto out_no_phychans
;
1951 for (i
= 0; i
< vd
->channels
; i
++) {
1952 struct pl08x_phy_chan
*ch
= &pl08x
->phy_chans
[i
];
1955 ch
->base
= pl08x
->base
+ PL080_Cx_BASE(i
);
1956 spin_lock_init(&ch
->lock
);
1959 * Nomadik variants can have channels that are locked
1960 * down for the secure world only. Lock up these channels
1961 * by perpetually serving a dummy virtual channel.
1966 val
= readl(ch
->base
+ PL080_CH_CONFIG
);
1967 if (val
& (PL080N_CONFIG_ITPROT
| PL080N_CONFIG_SECPROT
)) {
1968 dev_info(&adev
->dev
, "physical channel %d reserved for secure access only\n", i
);
1973 dev_dbg(&adev
->dev
, "physical channel %d is %s\n",
1974 i
, pl08x_phy_channel_busy(ch
) ? "BUSY" : "FREE");
1977 /* Register as many memcpy channels as there are physical channels */
1978 ret
= pl08x_dma_init_virtual_channels(pl08x
, &pl08x
->memcpy
,
1979 pl08x
->vd
->channels
, false);
1981 dev_warn(&pl08x
->adev
->dev
,
1982 "%s failed to enumerate memcpy channels - %d\n",
1986 pl08x
->memcpy
.chancnt
= ret
;
1988 /* Register slave channels */
1989 ret
= pl08x_dma_init_virtual_channels(pl08x
, &pl08x
->slave
,
1990 pl08x
->pd
->num_slave_channels
, true);
1992 dev_warn(&pl08x
->adev
->dev
,
1993 "%s failed to enumerate slave channels - %d\n",
1997 pl08x
->slave
.chancnt
= ret
;
1999 ret
= dma_async_device_register(&pl08x
->memcpy
);
2001 dev_warn(&pl08x
->adev
->dev
,
2002 "%s failed to register memcpy as an async device - %d\n",
2004 goto out_no_memcpy_reg
;
2007 ret
= dma_async_device_register(&pl08x
->slave
);
2009 dev_warn(&pl08x
->adev
->dev
,
2010 "%s failed to register slave as an async device - %d\n",
2012 goto out_no_slave_reg
;
2015 amba_set_drvdata(adev
, pl08x
);
2016 init_pl08x_debugfs(pl08x
);
2017 dev_info(&pl08x
->adev
->dev
, "DMA: PL%03x rev%u at 0x%08llx irq %d\n",
2018 amba_part(adev
), amba_rev(adev
),
2019 (unsigned long long)adev
->res
.start
, adev
->irq
[0]);
2024 dma_async_device_unregister(&pl08x
->memcpy
);
2026 pl08x_free_virtual_channels(&pl08x
->slave
);
2028 pl08x_free_virtual_channels(&pl08x
->memcpy
);
2030 kfree(pl08x
->phy_chans
);
2032 free_irq(adev
->irq
[0], pl08x
);
2034 iounmap(pl08x
->base
);
2036 dma_pool_destroy(pl08x
->pool
);
2041 amba_release_regions(adev
);
2045 /* PL080 has 8 channels and the PL080 have just 2 */
2046 static struct vendor_data vendor_pl080
= {
2051 static struct vendor_data vendor_nomadik
= {
2057 static struct vendor_data vendor_pl081
= {
2059 .dualmaster
= false,
2062 static struct amba_id pl08x_ids
[] = {
2067 .data
= &vendor_pl080
,
2073 .data
= &vendor_pl081
,
2075 /* Nomadik 8815 PL080 variant */
2079 .data
= &vendor_nomadik
,
2084 MODULE_DEVICE_TABLE(amba
, pl08x_ids
);
2086 static struct amba_driver pl08x_amba_driver
= {
2087 .drv
.name
= DRIVER_NAME
,
2088 .id_table
= pl08x_ids
,
2089 .probe
= pl08x_probe
,
2092 static int __init
pl08x_init(void)
2095 retval
= amba_driver_register(&pl08x_amba_driver
);
2097 printk(KERN_WARNING DRIVER_NAME
2098 "failed to register as an AMBA device (%d)\n",
2102 subsys_initcall(pl08x_init
);