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);