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"
90 #define DRIVER_NAME "pl08xdmac"
92 static struct amba_driver pl08x_amba_driver;
93 struct pl08x_driver_data;
96 * struct vendor_data - vendor-specific config parameters for PL08x derivatives
97 * @channels: the number of channels available in this variant
98 * @dualmaster: whether this version supports dual AHB masters or not.
99 * @nomadik: whether the channels have Nomadik security extension bits
100 * that need to be checked for permission before use and some registers are
110 * PL08X private data structures
111 * An LLI struct - see PL08x TRM. Note that next uses bit[0] as a bus bit,
112 * start & end do not - their bus bit info is in cctl. Also note that these
113 * are fixed 32-bit quantities.
123 * struct pl08x_bus_data - information of source or destination
124 * busses for a transfer
125 * @addr: current address
126 * @maxwidth: the maximum width of a transfer on this bus
127 * @buswidth: the width of this bus in bytes: 1, 2 or 4
129 struct pl08x_bus_data {
136 * struct pl08x_phy_chan - holder for the physical channels
137 * @id: physical index to this channel
138 * @lock: a lock to use when altering an instance of this struct
139 * @serving: the virtual channel currently being served by this physical
141 * @locked: channel unavailable for the system, e.g. dedicated to secure
144 struct pl08x_phy_chan {
148 struct pl08x_dma_chan *serving;
153 * struct pl08x_sg - structure containing data per sg
154 * @src_addr: src address of sg
155 * @dst_addr: dst address of sg
156 * @len: transfer len in bytes
157 * @node: node for txd's dsg_list
163 struct list_head node;
167 * struct pl08x_txd - wrapper for struct dma_async_tx_descriptor
168 * @tx: async tx descriptor
169 * @node: node for txd list for channels
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
177 struct dma_async_tx_descriptor tx;
178 struct list_head node;
179 struct list_head dsg_list;
181 struct pl08x_lli *llis_va;
182 /* Default cctl value for LLIs */
185 * Settings to be put into the physical channel when we
186 * trigger this txd. Other registers are in llis_va[0].
192 * struct pl08x_dma_chan_state - holds the PL08x specific virtual channel
194 * @PL08X_CHAN_IDLE: the channel is idle
195 * @PL08X_CHAN_RUNNING: the channel has allocated a physical transport
196 * channel and is running a transfer on it
197 * @PL08X_CHAN_PAUSED: the channel has allocated a physical transport
198 * channel, but the transfer is currently paused
199 * @PL08X_CHAN_WAITING: the channel is waiting for a physical transport
200 * channel to become available (only pertains to memcpy channels)
202 enum pl08x_dma_chan_state {
210 * struct pl08x_dma_chan - this structure wraps a DMA ENGINE channel
211 * @chan: wrappped abstract channel
212 * @phychan: the physical channel utilized by this channel, if there is one
213 * @phychan_hold: if non-zero, hold on to the physical channel even if we
214 * have no pending entries
215 * @tasklet: tasklet scheduled by the IRQ to handle actual work etc
216 * @name: name of channel
217 * @cd: channel platform data
218 * @runtime_addr: address for RX/TX according to the runtime config
219 * @pend_list: queued transactions pending on this channel
220 * @done_list: list of completed transactions
221 * @at: active transaction on this channel
222 * @lock: a lock for this channel data
223 * @host: a pointer to the host (internal use)
224 * @state: whether the channel is idle, paused, running etc
225 * @slave: whether this channel is a device (slave) or for memcpy
226 * @waiting: a TX descriptor on this channel which is waiting for a physical
227 * channel to become available
228 * @signal: the physical DMA request signal which this channel is using
229 * @mux_use: count of descriptors using this DMA request signal setting
231 struct pl08x_dma_chan {
232 struct dma_chan chan;
233 struct pl08x_phy_chan *phychan;
235 struct tasklet_struct tasklet;
237 const struct pl08x_channel_data *cd;
238 struct dma_slave_config cfg;
239 struct list_head pend_list;
240 struct list_head done_list;
241 struct pl08x_txd *at;
243 struct pl08x_driver_data *host;
244 enum pl08x_dma_chan_state state;
246 struct pl08x_txd *waiting;
252 * struct pl08x_driver_data - the local state holder for the PL08x
253 * @slave: slave engine for this instance
254 * @memcpy: memcpy engine for this instance
255 * @base: virtual memory base (remapped) for the PL08x
256 * @adev: the corresponding AMBA (PrimeCell) bus entry
257 * @vd: vendor data for this PL08x variant
258 * @pd: platform data passed in from the platform/machine
259 * @phy_chans: array of data for the physical channels
260 * @pool: a pool for the LLI descriptors
261 * @pool_ctr: counter of LLIs in the pool
262 * @lli_buses: bitmask to or in to LLI pointer selecting AHB port for LLI
264 * @mem_buses: set to indicate memory transfers on AHB2.
265 * @lock: a spinlock for this struct
267 struct pl08x_driver_data {
268 struct dma_device slave;
269 struct dma_device memcpy;
271 struct amba_device *adev;
272 const struct vendor_data *vd;
273 struct pl08x_platform_data *pd;
274 struct pl08x_phy_chan *phy_chans;
275 struct dma_pool *pool;
282 * PL08X specific defines
285 /* Size (bytes) of each LLI buffer allocated for one transfer */
286 # define PL08X_LLI_TSFR_SIZE 0x2000
288 /* Maximum times we call dma_pool_alloc on this pool without freeing */
289 #define MAX_NUM_TSFR_LLIS (PL08X_LLI_TSFR_SIZE/sizeof(struct pl08x_lli))
290 #define PL08X_ALIGN 8
292 static inline struct pl08x_dma_chan *to_pl08x_chan(struct dma_chan *chan)
294 return container_of(chan, struct pl08x_dma_chan, chan);
297 static inline struct pl08x_txd *to_pl08x_txd(struct dma_async_tx_descriptor *tx)
299 return container_of(tx, struct pl08x_txd, tx);
305 * This gives us the DMA request input to the PL08x primecell which the
306 * peripheral described by the channel data will be routed to, possibly
307 * via a board/SoC specific external MUX. One important point to note
308 * here is that this does not depend on the physical channel.
310 static int pl08x_request_mux(struct pl08x_dma_chan *plchan)
312 const struct pl08x_platform_data *pd = plchan->host->pd;
315 if (plchan->mux_use++ == 0 && pd->get_signal) {
316 ret = pd->get_signal(plchan->cd);
322 plchan->signal = ret;
327 static void pl08x_release_mux(struct pl08x_dma_chan *plchan)
329 const struct pl08x_platform_data *pd = plchan->host->pd;
331 if (plchan->signal >= 0) {
332 WARN_ON(plchan->mux_use == 0);
334 if (--plchan->mux_use == 0 && pd->put_signal) {
335 pd->put_signal(plchan->cd, plchan->signal);
342 * Physical channel handling
345 /* Whether a certain channel is busy or not */
346 static int pl08x_phy_channel_busy(struct pl08x_phy_chan *ch)
350 val = readl(ch->base + PL080_CH_CONFIG);
351 return val & PL080_CONFIG_ACTIVE;
355 * Set the initial DMA register values i.e. those for the first LLI
356 * The next LLI pointer and the configuration interrupt bit have
357 * been set when the LLIs were constructed. Poke them into the hardware
358 * and start the transfer.
360 static void pl08x_start_txd(struct pl08x_dma_chan *plchan,
361 struct pl08x_txd *txd)
363 struct pl08x_driver_data *pl08x = plchan->host;
364 struct pl08x_phy_chan *phychan = plchan->phychan;
365 struct pl08x_lli *lli = &txd->llis_va[0];
370 /* Wait for channel inactive */
371 while (pl08x_phy_channel_busy(phychan))
374 dev_vdbg(&pl08x->adev->dev,
375 "WRITE channel %d: csrc=0x%08x, cdst=0x%08x, "
376 "clli=0x%08x, cctl=0x%08x, ccfg=0x%08x\n",
377 phychan->id, lli->src, lli->dst, lli->lli, lli->cctl,
380 writel(lli->src, phychan->base + PL080_CH_SRC_ADDR);
381 writel(lli->dst, phychan->base + PL080_CH_DST_ADDR);
382 writel(lli->lli, phychan->base + PL080_CH_LLI);
383 writel(lli->cctl, phychan->base + PL080_CH_CONTROL);
384 writel(txd->ccfg, phychan->base + PL080_CH_CONFIG);
386 /* Enable the DMA channel */
387 /* Do not access config register until channel shows as disabled */
388 while (readl(pl08x->base + PL080_EN_CHAN) & (1 << phychan->id))
391 /* Do not access config register until channel shows as inactive */
392 val = readl(phychan->base + PL080_CH_CONFIG);
393 while ((val & PL080_CONFIG_ACTIVE) || (val & PL080_CONFIG_ENABLE))
394 val = readl(phychan->base + PL080_CH_CONFIG);
396 writel(val | PL080_CONFIG_ENABLE, phychan->base + PL080_CH_CONFIG);
400 * Pause the channel by setting the HALT bit.
402 * For M->P transfers, pause the DMAC first and then stop the peripheral -
403 * the FIFO can only drain if the peripheral is still requesting data.
404 * (note: this can still timeout if the DMAC FIFO never drains of data.)
406 * For P->M transfers, disable the peripheral first to stop it filling
407 * the DMAC FIFO, and then pause the DMAC.
409 static void pl08x_pause_phy_chan(struct pl08x_phy_chan *ch)
414 /* Set the HALT bit and wait for the FIFO to drain */
415 val = readl(ch->base + PL080_CH_CONFIG);
416 val |= PL080_CONFIG_HALT;
417 writel(val, ch->base + PL080_CH_CONFIG);
419 /* Wait for channel inactive */
420 for (timeout = 1000; timeout; timeout--) {
421 if (!pl08x_phy_channel_busy(ch))
425 if (pl08x_phy_channel_busy(ch))
426 pr_err("pl08x: channel%u timeout waiting for pause\n", ch->id);
429 static void pl08x_resume_phy_chan(struct pl08x_phy_chan *ch)
433 /* Clear the HALT bit */
434 val = readl(ch->base + PL080_CH_CONFIG);
435 val &= ~PL080_CONFIG_HALT;
436 writel(val, ch->base + PL080_CH_CONFIG);
440 * pl08x_terminate_phy_chan() stops the channel, clears the FIFO and
441 * clears any pending interrupt status. This should not be used for
442 * an on-going transfer, but as a method of shutting down a channel
443 * (eg, when it's no longer used) or terminating a transfer.
445 static void pl08x_terminate_phy_chan(struct pl08x_driver_data *pl08x,
446 struct pl08x_phy_chan *ch)
448 u32 val = readl(ch->base + PL080_CH_CONFIG);
450 val &= ~(PL080_CONFIG_ENABLE | PL080_CONFIG_ERR_IRQ_MASK |
451 PL080_CONFIG_TC_IRQ_MASK);
453 writel(val, ch->base + PL080_CH_CONFIG);
455 writel(1 << ch->id, pl08x->base + PL080_ERR_CLEAR);
456 writel(1 << ch->id, pl08x->base + PL080_TC_CLEAR);
459 static inline u32 get_bytes_in_cctl(u32 cctl)
461 /* The source width defines the number of bytes */
462 u32 bytes = cctl & PL080_CONTROL_TRANSFER_SIZE_MASK;
464 switch (cctl >> PL080_CONTROL_SWIDTH_SHIFT) {
465 case PL080_WIDTH_8BIT:
467 case PL080_WIDTH_16BIT:
470 case PL080_WIDTH_32BIT:
477 /* The channel should be paused when calling this */
478 static u32 pl08x_getbytes_chan(struct pl08x_dma_chan *plchan)
480 struct pl08x_phy_chan *ch;
481 struct pl08x_txd *txd;
485 spin_lock_irqsave(&plchan->lock, flags);
486 ch = plchan->phychan;
490 * Follow the LLIs to get the number of remaining
491 * bytes in the currently active transaction.
494 u32 clli = readl(ch->base + PL080_CH_LLI) & ~PL080_LLI_LM_AHB2;
496 /* First get the remaining bytes in the active transfer */
497 bytes = get_bytes_in_cctl(readl(ch->base + PL080_CH_CONTROL));
500 struct pl08x_lli *llis_va = txd->llis_va;
501 dma_addr_t llis_bus = txd->llis_bus;
504 BUG_ON(clli < llis_bus || clli >= llis_bus +
505 sizeof(struct pl08x_lli) * MAX_NUM_TSFR_LLIS);
508 * Locate the next LLI - as this is an array,
509 * it's simple maths to find.
511 index = (clli - llis_bus) / sizeof(struct pl08x_lli);
513 for (; index < MAX_NUM_TSFR_LLIS; index++) {
514 bytes += get_bytes_in_cctl(llis_va[index].cctl);
517 * A LLI pointer of 0 terminates the LLI list
519 if (!llis_va[index].lli)
525 /* Sum up all queued transactions */
526 if (!list_empty(&plchan->pend_list)) {
527 struct pl08x_txd *txdi;
528 list_for_each_entry(txdi, &plchan->pend_list, node) {
529 struct pl08x_sg *dsg;
530 list_for_each_entry(dsg, &txd->dsg_list, node)
535 spin_unlock_irqrestore(&plchan->lock, flags);
541 * Allocate a physical channel for a virtual channel
543 * Try to locate a physical channel to be used for this transfer. If all
544 * are taken return NULL and the requester will have to cope by using
545 * some fallback PIO mode or retrying later.
547 static struct pl08x_phy_chan *
548 pl08x_get_phy_channel(struct pl08x_driver_data *pl08x,
549 struct pl08x_dma_chan *virt_chan)
551 struct pl08x_phy_chan *ch = NULL;
555 for (i = 0; i < pl08x->vd->channels; i++) {
556 ch = &pl08x->phy_chans[i];
558 spin_lock_irqsave(&ch->lock, flags);
560 if (!ch->locked && !ch->serving) {
561 ch->serving = virt_chan;
562 spin_unlock_irqrestore(&ch->lock, flags);
566 spin_unlock_irqrestore(&ch->lock, flags);
569 if (i == pl08x->vd->channels) {
570 /* No physical channel available, cope with it */
577 static inline void pl08x_put_phy_channel(struct pl08x_driver_data *pl08x,
578 struct pl08x_phy_chan *ch)
582 spin_lock_irqsave(&ch->lock, flags);
584 /* Stop the channel and clear its interrupts */
585 pl08x_terminate_phy_chan(pl08x, ch);
587 /* Mark it as free */
589 spin_unlock_irqrestore(&ch->lock, flags);
596 static inline unsigned int pl08x_get_bytes_for_cctl(unsigned int coded)
599 case PL080_WIDTH_8BIT:
601 case PL080_WIDTH_16BIT:
603 case PL080_WIDTH_32BIT:
612 static inline u32 pl08x_cctl_bits(u32 cctl, u8 srcwidth, u8 dstwidth,
617 /* Remove all src, dst and transfer size bits */
618 retbits &= ~PL080_CONTROL_DWIDTH_MASK;
619 retbits &= ~PL080_CONTROL_SWIDTH_MASK;
620 retbits &= ~PL080_CONTROL_TRANSFER_SIZE_MASK;
622 /* Then set the bits according to the parameters */
625 retbits |= PL080_WIDTH_8BIT << PL080_CONTROL_SWIDTH_SHIFT;
628 retbits |= PL080_WIDTH_16BIT << PL080_CONTROL_SWIDTH_SHIFT;
631 retbits |= PL080_WIDTH_32BIT << PL080_CONTROL_SWIDTH_SHIFT;
640 retbits |= PL080_WIDTH_8BIT << PL080_CONTROL_DWIDTH_SHIFT;
643 retbits |= PL080_WIDTH_16BIT << PL080_CONTROL_DWIDTH_SHIFT;
646 retbits |= PL080_WIDTH_32BIT << PL080_CONTROL_DWIDTH_SHIFT;
653 retbits |= tsize << PL080_CONTROL_TRANSFER_SIZE_SHIFT;
657 struct pl08x_lli_build_data {
658 struct pl08x_txd *txd;
659 struct pl08x_bus_data srcbus;
660 struct pl08x_bus_data dstbus;
666 * Autoselect a master bus to use for the transfer. Slave will be the chosen as
667 * victim in case src & dest are not similarly aligned. i.e. If after aligning
668 * masters address with width requirements of transfer (by sending few byte by
669 * byte data), slave is still not aligned, then its width will be reduced to
671 * - prefers the destination bus if both available
672 * - prefers bus with fixed address (i.e. peripheral)
674 static void pl08x_choose_master_bus(struct pl08x_lli_build_data *bd,
675 struct pl08x_bus_data **mbus, struct pl08x_bus_data **sbus, u32 cctl)
677 if (!(cctl & PL080_CONTROL_DST_INCR)) {
680 } else if (!(cctl & PL080_CONTROL_SRC_INCR)) {
684 if (bd->dstbus.buswidth >= bd->srcbus.buswidth) {
695 * Fills in one LLI for a certain transfer descriptor and advance the counter
697 static void pl08x_fill_lli_for_desc(struct pl08x_lli_build_data *bd,
698 int num_llis, int len, u32 cctl)
700 struct pl08x_lli *llis_va = bd->txd->llis_va;
701 dma_addr_t llis_bus = bd->txd->llis_bus;
703 BUG_ON(num_llis >= MAX_NUM_TSFR_LLIS);
705 llis_va[num_llis].cctl = cctl;
706 llis_va[num_llis].src = bd->srcbus.addr;
707 llis_va[num_llis].dst = bd->dstbus.addr;
708 llis_va[num_llis].lli = llis_bus + (num_llis + 1) *
709 sizeof(struct pl08x_lli);
710 llis_va[num_llis].lli |= bd->lli_bus;
712 if (cctl & PL080_CONTROL_SRC_INCR)
713 bd->srcbus.addr += len;
714 if (cctl & PL080_CONTROL_DST_INCR)
715 bd->dstbus.addr += len;
717 BUG_ON(bd->remainder < len);
719 bd->remainder -= len;
722 static inline void prep_byte_width_lli(struct pl08x_lli_build_data *bd,
723 u32 *cctl, u32 len, int num_llis, size_t *total_bytes)
725 *cctl = pl08x_cctl_bits(*cctl, 1, 1, len);
726 pl08x_fill_lli_for_desc(bd, num_llis, len, *cctl);
727 (*total_bytes) += len;
731 * This fills in the table of LLIs for the transfer descriptor
732 * Note that we assume we never have to change the burst sizes
735 static int pl08x_fill_llis_for_desc(struct pl08x_driver_data *pl08x,
736 struct pl08x_txd *txd)
738 struct pl08x_bus_data *mbus, *sbus;
739 struct pl08x_lli_build_data bd;
741 u32 cctl, early_bytes = 0;
742 size_t max_bytes_per_lli, total_bytes;
743 struct pl08x_lli *llis_va;
744 struct pl08x_sg *dsg;
746 txd->llis_va = dma_pool_alloc(pl08x->pool, GFP_NOWAIT, &txd->llis_bus);
748 dev_err(&pl08x->adev->dev, "%s no memory for llis\n", __func__);
755 bd.lli_bus = (pl08x->lli_buses & PL08X_AHB2) ? PL080_LLI_LM_AHB2 : 0;
758 /* Find maximum width of the source bus */
760 pl08x_get_bytes_for_cctl((cctl & PL080_CONTROL_SWIDTH_MASK) >>
761 PL080_CONTROL_SWIDTH_SHIFT);
763 /* Find maximum width of the destination bus */
765 pl08x_get_bytes_for_cctl((cctl & PL080_CONTROL_DWIDTH_MASK) >>
766 PL080_CONTROL_DWIDTH_SHIFT);
768 list_for_each_entry(dsg, &txd->dsg_list, node) {
772 bd.srcbus.addr = dsg->src_addr;
773 bd.dstbus.addr = dsg->dst_addr;
774 bd.remainder = dsg->len;
775 bd.srcbus.buswidth = bd.srcbus.maxwidth;
776 bd.dstbus.buswidth = bd.dstbus.maxwidth;
778 pl08x_choose_master_bus(&bd, &mbus, &sbus, cctl);
780 dev_vdbg(&pl08x->adev->dev, "src=0x%08x%s/%u dst=0x%08x%s/%u len=%zu\n",
781 bd.srcbus.addr, cctl & PL080_CONTROL_SRC_INCR ? "+" : "",
783 bd.dstbus.addr, cctl & PL080_CONTROL_DST_INCR ? "+" : "",
786 dev_vdbg(&pl08x->adev->dev, "mbus=%s sbus=%s\n",
787 mbus == &bd.srcbus ? "src" : "dst",
788 sbus == &bd.srcbus ? "src" : "dst");
791 * Zero length is only allowed if all these requirements are
793 * - flow controller is peripheral.
794 * - src.addr is aligned to src.width
795 * - dst.addr is aligned to dst.width
797 * sg_len == 1 should be true, as there can be two cases here:
799 * - Memory addresses are contiguous and are not scattered.
800 * Here, Only one sg will be passed by user driver, with
801 * memory address and zero length. We pass this to controller
802 * and after the transfer it will receive the last burst
803 * request from peripheral and so transfer finishes.
805 * - Memory addresses are scattered and are not contiguous.
806 * Here, Obviously as DMA controller doesn't know when a lli's
807 * transfer gets over, it can't load next lli. So in this
808 * case, there has to be an assumption that only one lli is
809 * supported. Thus, we can't have scattered addresses.
812 u32 fc = (txd->ccfg & PL080_CONFIG_FLOW_CONTROL_MASK) >>
813 PL080_CONFIG_FLOW_CONTROL_SHIFT;
814 if (!((fc >= PL080_FLOW_SRC2DST_DST) &&
815 (fc <= PL080_FLOW_SRC2DST_SRC))) {
816 dev_err(&pl08x->adev->dev, "%s sg len can't be zero",
821 if ((bd.srcbus.addr % bd.srcbus.buswidth) ||
822 (bd.dstbus.addr % bd.dstbus.buswidth)) {
823 dev_err(&pl08x->adev->dev,
824 "%s src & dst address must be aligned to src"
825 " & dst width if peripheral is flow controller",
830 cctl = pl08x_cctl_bits(cctl, bd.srcbus.buswidth,
831 bd.dstbus.buswidth, 0);
832 pl08x_fill_lli_for_desc(&bd, num_llis++, 0, cctl);
837 * Send byte by byte for following cases
838 * - Less than a bus width available
839 * - until master bus is aligned
841 if (bd.remainder < mbus->buswidth)
842 early_bytes = bd.remainder;
843 else if ((mbus->addr) % (mbus->buswidth)) {
844 early_bytes = mbus->buswidth - (mbus->addr) %
846 if ((bd.remainder - early_bytes) < mbus->buswidth)
847 early_bytes = bd.remainder;
851 dev_vdbg(&pl08x->adev->dev,
852 "%s byte width LLIs (remain 0x%08x)\n",
853 __func__, bd.remainder);
854 prep_byte_width_lli(&bd, &cctl, early_bytes, num_llis++,
861 * - if slave is not then we must set its width down
863 if (sbus->addr % sbus->buswidth) {
864 dev_dbg(&pl08x->adev->dev,
865 "%s set down bus width to one byte\n",
872 * Bytes transferred = tsize * src width, not
875 max_bytes_per_lli = bd.srcbus.buswidth *
876 PL080_CONTROL_TRANSFER_SIZE_MASK;
877 dev_vdbg(&pl08x->adev->dev,
878 "%s max bytes per lli = %zu\n",
879 __func__, max_bytes_per_lli);
882 * Make largest possible LLIs until less than one bus
885 while (bd.remainder > (mbus->buswidth - 1)) {
886 size_t lli_len, tsize, width;
889 * If enough left try to send max possible,
890 * otherwise try to send the remainder
892 lli_len = min(bd.remainder, max_bytes_per_lli);
895 * Check against maximum bus alignment:
896 * Calculate actual transfer size in relation to
897 * bus width an get a maximum remainder of the
898 * highest bus width - 1
900 width = max(mbus->buswidth, sbus->buswidth);
901 lli_len = (lli_len / width) * width;
902 tsize = lli_len / bd.srcbus.buswidth;
904 dev_vdbg(&pl08x->adev->dev,
905 "%s fill lli with single lli chunk of "
906 "size 0x%08zx (remainder 0x%08zx)\n",
907 __func__, lli_len, bd.remainder);
909 cctl = pl08x_cctl_bits(cctl, bd.srcbus.buswidth,
910 bd.dstbus.buswidth, tsize);
911 pl08x_fill_lli_for_desc(&bd, num_llis++,
913 total_bytes += lli_len;
920 dev_vdbg(&pl08x->adev->dev,
921 "%s align with boundary, send odd bytes (remain %zu)\n",
922 __func__, bd.remainder);
923 prep_byte_width_lli(&bd, &cctl, bd.remainder,
924 num_llis++, &total_bytes);
928 if (total_bytes != dsg->len) {
929 dev_err(&pl08x->adev->dev,
930 "%s size of encoded lli:s don't match total txd, transferred 0x%08zx from size 0x%08zx\n",
931 __func__, total_bytes, dsg->len);
935 if (num_llis >= MAX_NUM_TSFR_LLIS) {
936 dev_err(&pl08x->adev->dev,
937 "%s need to increase MAX_NUM_TSFR_LLIS from 0x%08x\n",
938 __func__, (u32) MAX_NUM_TSFR_LLIS);
943 llis_va = txd->llis_va;
944 /* The final LLI terminates the LLI. */
945 llis_va[num_llis - 1].lli = 0;
946 /* The final LLI element shall also fire an interrupt. */
947 llis_va[num_llis - 1].cctl |= PL080_CONTROL_TC_IRQ_EN;
953 dev_vdbg(&pl08x->adev->dev,
954 "%-3s %-9s %-10s %-10s %-10s %s\n",
955 "lli", "", "csrc", "cdst", "clli", "cctl");
956 for (i = 0; i < num_llis; i++) {
957 dev_vdbg(&pl08x->adev->dev,
958 "%3d @%p: 0x%08x 0x%08x 0x%08x 0x%08x\n",
959 i, &llis_va[i], llis_va[i].src,
960 llis_va[i].dst, llis_va[i].lli, llis_va[i].cctl
969 /* You should call this with the struct pl08x lock held */
970 static void pl08x_free_txd(struct pl08x_driver_data *pl08x,
971 struct pl08x_txd *txd)
973 struct pl08x_sg *dsg, *_dsg;
977 dma_pool_free(pl08x->pool, txd->llis_va, txd->llis_bus);
981 list_for_each_entry_safe(dsg, _dsg, &txd->dsg_list, node) {
982 list_del(&dsg->node);
989 static void pl08x_free_txd_list(struct pl08x_driver_data *pl08x,
990 struct pl08x_dma_chan *plchan)
992 struct pl08x_txd *txdi = NULL;
993 struct pl08x_txd *next;
995 if (!list_empty(&plchan->pend_list)) {
996 list_for_each_entry_safe(txdi,
997 next, &plchan->pend_list, node) {
998 pl08x_release_mux(plchan);
999 list_del(&txdi->node);
1000 pl08x_free_txd(pl08x, txdi);
1006 * The DMA ENGINE API
1008 static int pl08x_alloc_chan_resources(struct dma_chan *chan)
1013 static void pl08x_free_chan_resources(struct dma_chan *chan)
1018 * This should be called with the channel plchan->lock held
1020 static int prep_phy_channel(struct pl08x_dma_chan *plchan)
1022 struct pl08x_driver_data *pl08x = plchan->host;
1023 struct pl08x_phy_chan *ch;
1025 /* Check if we already have a channel */
1026 if (plchan->phychan) {
1027 ch = plchan->phychan;
1031 ch = pl08x_get_phy_channel(pl08x, plchan);
1033 /* No physical channel available, cope with it */
1034 dev_dbg(&pl08x->adev->dev, "no physical channel available for xfer on %s\n", plchan->name);
1038 plchan->phychan = ch;
1039 dev_dbg(&pl08x->adev->dev, "allocated physical channel %d for xfer on %s\n",
1040 ch->id, plchan->name);
1043 plchan->phychan_hold++;
1048 static void release_phy_channel(struct pl08x_dma_chan *plchan)
1050 struct pl08x_driver_data *pl08x = plchan->host;
1052 pl08x_put_phy_channel(pl08x, plchan->phychan);
1053 plchan->phychan = NULL;
1056 static dma_cookie_t pl08x_tx_submit(struct dma_async_tx_descriptor *tx)
1058 struct pl08x_dma_chan *plchan = to_pl08x_chan(tx->chan);
1059 struct pl08x_txd *txd = to_pl08x_txd(tx);
1060 unsigned long flags;
1061 dma_cookie_t cookie;
1063 spin_lock_irqsave(&plchan->lock, flags);
1064 cookie = dma_cookie_assign(tx);
1066 /* Put this onto the pending list */
1067 list_add_tail(&txd->node, &plchan->pend_list);
1070 * If there was no physical channel available for this memcpy,
1071 * stack the request up and indicate that the channel is waiting
1072 * for a free physical channel.
1074 if (!plchan->slave && !plchan->phychan) {
1075 /* Do this memcpy whenever there is a channel ready */
1076 plchan->state = PL08X_CHAN_WAITING;
1077 plchan->waiting = txd;
1079 plchan->phychan_hold--;
1082 spin_unlock_irqrestore(&plchan->lock, flags);
1087 static struct dma_async_tx_descriptor *pl08x_prep_dma_interrupt(
1088 struct dma_chan *chan, unsigned long flags)
1090 struct dma_async_tx_descriptor *retval = NULL;
1096 * Code accessing dma_async_is_complete() in a tight loop may give problems.
1097 * If slaves are relying on interrupts to signal completion this function
1098 * must not be called with interrupts disabled.
1100 static enum dma_status pl08x_dma_tx_status(struct dma_chan *chan,
1101 dma_cookie_t cookie, struct dma_tx_state *txstate)
1103 struct pl08x_dma_chan *plchan = to_pl08x_chan(chan);
1104 enum dma_status ret;
1106 ret = dma_cookie_status(chan, cookie, txstate);
1107 if (ret == DMA_SUCCESS)
1111 * This cookie not complete yet
1112 * Get number of bytes left in the active transactions and queue
1114 dma_set_residue(txstate, pl08x_getbytes_chan(plchan));
1116 if (plchan->state == PL08X_CHAN_PAUSED)
1119 /* Whether waiting or running, we're in progress */
1120 return DMA_IN_PROGRESS;
1123 /* PrimeCell DMA extension */
1124 struct burst_table {
1129 static const struct burst_table burst_sizes[] = {
1132 .reg = PL080_BSIZE_256,
1136 .reg = PL080_BSIZE_128,
1140 .reg = PL080_BSIZE_64,
1144 .reg = PL080_BSIZE_32,
1148 .reg = PL080_BSIZE_16,
1152 .reg = PL080_BSIZE_8,
1156 .reg = PL080_BSIZE_4,
1160 .reg = PL080_BSIZE_1,
1165 * Given the source and destination available bus masks, select which
1166 * will be routed to each port. We try to have source and destination
1167 * on separate ports, but always respect the allowable settings.
1169 static u32 pl08x_select_bus(u8 src, u8 dst)
1173 if (!(dst & PL08X_AHB1) || ((dst & PL08X_AHB2) && (src & PL08X_AHB1)))
1174 cctl |= PL080_CONTROL_DST_AHB2;
1175 if (!(src & PL08X_AHB1) || ((src & PL08X_AHB2) && !(dst & PL08X_AHB2)))
1176 cctl |= PL080_CONTROL_SRC_AHB2;
1181 static u32 pl08x_cctl(u32 cctl)
1183 cctl &= ~(PL080_CONTROL_SRC_AHB2 | PL080_CONTROL_DST_AHB2 |
1184 PL080_CONTROL_SRC_INCR | PL080_CONTROL_DST_INCR |
1185 PL080_CONTROL_PROT_MASK);
1187 /* Access the cell in privileged mode, non-bufferable, non-cacheable */
1188 return cctl | PL080_CONTROL_PROT_SYS;
1191 static u32 pl08x_width(enum dma_slave_buswidth width)
1194 case DMA_SLAVE_BUSWIDTH_1_BYTE:
1195 return PL080_WIDTH_8BIT;
1196 case DMA_SLAVE_BUSWIDTH_2_BYTES:
1197 return PL080_WIDTH_16BIT;
1198 case DMA_SLAVE_BUSWIDTH_4_BYTES:
1199 return PL080_WIDTH_32BIT;
1205 static u32 pl08x_burst(u32 maxburst)
1209 for (i = 0; i < ARRAY_SIZE(burst_sizes); i++)
1210 if (burst_sizes[i].burstwords <= maxburst)
1213 return burst_sizes[i].reg;
1216 static u32 pl08x_get_cctl(struct pl08x_dma_chan *plchan,
1217 enum dma_slave_buswidth addr_width, u32 maxburst)
1219 u32 width, burst, cctl = 0;
1221 width = pl08x_width(addr_width);
1225 cctl |= width << PL080_CONTROL_SWIDTH_SHIFT;
1226 cctl |= width << PL080_CONTROL_DWIDTH_SHIFT;
1229 * If this channel will only request single transfers, set this
1230 * down to ONE element. Also select one element if no maxburst
1233 if (plchan->cd->single)
1236 burst = pl08x_burst(maxburst);
1237 cctl |= burst << PL080_CONTROL_SB_SIZE_SHIFT;
1238 cctl |= burst << PL080_CONTROL_DB_SIZE_SHIFT;
1240 return pl08x_cctl(cctl);
1243 static int dma_set_runtime_config(struct dma_chan *chan,
1244 struct dma_slave_config *config)
1246 struct pl08x_dma_chan *plchan = to_pl08x_chan(chan);
1251 /* Reject definitely invalid configurations */
1252 if (config->src_addr_width == DMA_SLAVE_BUSWIDTH_8_BYTES ||
1253 config->dst_addr_width == DMA_SLAVE_BUSWIDTH_8_BYTES)
1256 plchan->cfg = *config;
1262 * Slave transactions callback to the slave device to allow
1263 * synchronization of slave DMA signals with the DMAC enable
1265 static void pl08x_issue_pending(struct dma_chan *chan)
1267 struct pl08x_dma_chan *plchan = to_pl08x_chan(chan);
1268 unsigned long flags;
1270 spin_lock_irqsave(&plchan->lock, flags);
1271 /* Something is already active, or we're waiting for a channel... */
1272 if (plchan->at || plchan->state == PL08X_CHAN_WAITING) {
1273 spin_unlock_irqrestore(&plchan->lock, flags);
1277 /* Take the first element in the queue and execute it */
1278 if (!list_empty(&plchan->pend_list)) {
1279 struct pl08x_txd *next;
1281 next = list_first_entry(&plchan->pend_list,
1284 list_del(&next->node);
1285 plchan->state = PL08X_CHAN_RUNNING;
1287 pl08x_start_txd(plchan, next);
1290 spin_unlock_irqrestore(&plchan->lock, flags);
1293 static int pl08x_prep_channel_resources(struct pl08x_dma_chan *plchan,
1294 struct pl08x_txd *txd)
1296 struct pl08x_driver_data *pl08x = plchan->host;
1297 unsigned long flags;
1300 num_llis = pl08x_fill_llis_for_desc(pl08x, txd);
1302 spin_lock_irqsave(&plchan->lock, flags);
1303 pl08x_free_txd(pl08x, txd);
1304 spin_unlock_irqrestore(&plchan->lock, flags);
1308 spin_lock_irqsave(&plchan->lock, flags);
1311 * See if we already have a physical channel allocated,
1312 * else this is the time to try to get one.
1314 ret = prep_phy_channel(plchan);
1317 * No physical channel was available.
1319 * memcpy transfers can be sorted out at submission time.
1321 if (plchan->slave) {
1322 pl08x_free_txd_list(pl08x, plchan);
1323 pl08x_free_txd(pl08x, txd);
1324 spin_unlock_irqrestore(&plchan->lock, flags);
1329 * Else we're all set, paused and ready to roll, status
1330 * will switch to PL08X_CHAN_RUNNING when we call
1331 * issue_pending(). If there is something running on the
1332 * channel already we don't change its state.
1334 if (plchan->state == PL08X_CHAN_IDLE)
1335 plchan->state = PL08X_CHAN_PAUSED;
1337 spin_unlock_irqrestore(&plchan->lock, flags);
1342 static struct pl08x_txd *pl08x_get_txd(struct pl08x_dma_chan *plchan,
1343 unsigned long flags)
1345 struct pl08x_txd *txd = kzalloc(sizeof(*txd), GFP_NOWAIT);
1348 dma_async_tx_descriptor_init(&txd->tx, &plchan->chan);
1349 txd->tx.flags = flags;
1350 txd->tx.tx_submit = pl08x_tx_submit;
1351 INIT_LIST_HEAD(&txd->node);
1352 INIT_LIST_HEAD(&txd->dsg_list);
1354 /* Always enable error and terminal interrupts */
1355 txd->ccfg = PL080_CONFIG_ERR_IRQ_MASK |
1356 PL080_CONFIG_TC_IRQ_MASK;
1362 * Initialize a descriptor to be used by memcpy submit
1364 static struct dma_async_tx_descriptor *pl08x_prep_dma_memcpy(
1365 struct dma_chan *chan, dma_addr_t dest, dma_addr_t src,
1366 size_t len, unsigned long flags)
1368 struct pl08x_dma_chan *plchan = to_pl08x_chan(chan);
1369 struct pl08x_driver_data *pl08x = plchan->host;
1370 struct pl08x_txd *txd;
1371 struct pl08x_sg *dsg;
1374 txd = pl08x_get_txd(plchan, flags);
1376 dev_err(&pl08x->adev->dev,
1377 "%s no memory for descriptor\n", __func__);
1381 dsg = kzalloc(sizeof(struct pl08x_sg), GFP_NOWAIT);
1383 pl08x_free_txd(pl08x, txd);
1384 dev_err(&pl08x->adev->dev, "%s no memory for pl080 sg\n",
1388 list_add_tail(&dsg->node, &txd->dsg_list);
1390 dsg->src_addr = src;
1391 dsg->dst_addr = dest;
1394 /* Set platform data for m2m */
1395 txd->ccfg |= PL080_FLOW_MEM2MEM << PL080_CONFIG_FLOW_CONTROL_SHIFT;
1396 txd->cctl = pl08x->pd->memcpy_channel.cctl_memcpy &
1397 ~(PL080_CONTROL_DST_AHB2 | PL080_CONTROL_SRC_AHB2);
1399 /* Both to be incremented or the code will break */
1400 txd->cctl |= PL080_CONTROL_SRC_INCR | PL080_CONTROL_DST_INCR;
1402 if (pl08x->vd->dualmaster)
1403 txd->cctl |= pl08x_select_bus(pl08x->mem_buses,
1406 ret = pl08x_prep_channel_resources(plchan, txd);
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, flags);
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_prep_channel_resources(plchan, txd);
1529 static int pl08x_control(struct dma_chan *chan, enum dma_ctrl_cmd cmd,
1532 struct pl08x_dma_chan *plchan = to_pl08x_chan(chan);
1533 struct pl08x_driver_data *pl08x = plchan->host;
1534 unsigned long flags;
1537 /* Controls applicable to inactive channels */
1538 if (cmd == DMA_SLAVE_CONFIG) {
1539 return dma_set_runtime_config(chan,
1540 (struct dma_slave_config *)arg);
1544 * Anything succeeds on channels with no physical allocation and
1545 * no queued transfers.
1547 spin_lock_irqsave(&plchan->lock, flags);
1548 if (!plchan->phychan && !plchan->at) {
1549 spin_unlock_irqrestore(&plchan->lock, flags);
1554 case DMA_TERMINATE_ALL:
1555 plchan->state = PL08X_CHAN_IDLE;
1557 if (plchan->phychan) {
1558 pl08x_terminate_phy_chan(pl08x, plchan->phychan);
1561 * Mark physical channel as free and free any slave
1564 release_phy_channel(plchan);
1565 plchan->phychan_hold = 0;
1567 /* Dequeue jobs and free LLIs */
1569 /* Killing this one off, release its mux */
1570 pl08x_release_mux(plchan);
1571 pl08x_free_txd(pl08x, plchan->at);
1574 /* Dequeue jobs not yet fired as well */
1575 pl08x_free_txd_list(pl08x, plchan);
1578 pl08x_pause_phy_chan(plchan->phychan);
1579 plchan->state = PL08X_CHAN_PAUSED;
1582 pl08x_resume_phy_chan(plchan->phychan);
1583 plchan->state = PL08X_CHAN_RUNNING;
1586 /* Unknown command */
1591 spin_unlock_irqrestore(&plchan->lock, flags);
1596 bool pl08x_filter_id(struct dma_chan *chan, void *chan_id)
1598 struct pl08x_dma_chan *plchan;
1599 char *name = chan_id;
1601 /* Reject channels for devices not bound to this driver */
1602 if (chan->device->dev->driver != &pl08x_amba_driver.drv)
1605 plchan = to_pl08x_chan(chan);
1607 /* Check that the channel is not taken! */
1608 if (!strcmp(plchan->name, name))
1615 * Just check that the device is there and active
1616 * TODO: turn this bit on/off depending on the number of physical channels
1617 * actually used, if it is zero... well shut it off. That will save some
1618 * power. Cut the clock at the same time.
1620 static void pl08x_ensure_on(struct pl08x_driver_data *pl08x)
1622 /* The Nomadik variant does not have the config register */
1623 if (pl08x->vd->nomadik)
1625 writel(PL080_CONFIG_ENABLE, pl08x->base + PL080_CONFIG);
1628 static void pl08x_unmap_buffers(struct pl08x_txd *txd)
1630 struct device *dev = txd->tx.chan->device->dev;
1631 struct pl08x_sg *dsg;
1633 if (!(txd->tx.flags & DMA_COMPL_SKIP_SRC_UNMAP)) {
1634 if (txd->tx.flags & DMA_COMPL_SRC_UNMAP_SINGLE)
1635 list_for_each_entry(dsg, &txd->dsg_list, node)
1636 dma_unmap_single(dev, dsg->src_addr, dsg->len,
1639 list_for_each_entry(dsg, &txd->dsg_list, node)
1640 dma_unmap_page(dev, dsg->src_addr, dsg->len,
1644 if (!(txd->tx.flags & DMA_COMPL_SKIP_DEST_UNMAP)) {
1645 if (txd->tx.flags & DMA_COMPL_DEST_UNMAP_SINGLE)
1646 list_for_each_entry(dsg, &txd->dsg_list, node)
1647 dma_unmap_single(dev, dsg->dst_addr, dsg->len,
1650 list_for_each_entry(dsg, &txd->dsg_list, node)
1651 dma_unmap_page(dev, dsg->dst_addr, dsg->len,
1656 static void pl08x_tasklet(unsigned long data)
1658 struct pl08x_dma_chan *plchan = (struct pl08x_dma_chan *) data;
1659 struct pl08x_driver_data *pl08x = plchan->host;
1660 unsigned long flags;
1663 spin_lock_irqsave(&plchan->lock, flags);
1664 list_splice_tail_init(&plchan->done_list, &head);
1666 /* If a new descriptor is queued, set it up plchan->at is NULL here */
1667 if (!list_empty(&plchan->pend_list)) {
1668 struct pl08x_txd *next;
1670 next = list_first_entry(&plchan->pend_list,
1673 list_del(&next->node);
1675 pl08x_start_txd(plchan, next);
1676 } else if (plchan->phychan_hold) {
1678 * This channel is still in use - we have a new txd being
1679 * prepared and will soon be queued. Don't give up the
1683 struct pl08x_dma_chan *waiting = NULL;
1686 * No more jobs, so free up the physical channel
1688 release_phy_channel(plchan);
1689 plchan->state = PL08X_CHAN_IDLE;
1692 * And NOW before anyone else can grab that free:d up
1693 * physical channel, see if there is some memcpy pending
1694 * that seriously needs to start because of being stacked
1695 * up while we were choking the physical channels with data.
1697 list_for_each_entry(waiting, &pl08x->memcpy.channels,
1699 if (waiting->state == PL08X_CHAN_WAITING &&
1700 waiting->waiting != NULL) {
1703 /* This should REALLY not fail now */
1704 ret = prep_phy_channel(waiting);
1706 waiting->phychan_hold--;
1707 waiting->state = PL08X_CHAN_RUNNING;
1708 waiting->waiting = NULL;
1709 pl08x_issue_pending(&waiting->chan);
1715 spin_unlock_irqrestore(&plchan->lock, flags);
1717 while (!list_empty(&head)) {
1718 struct pl08x_txd *txd = list_first_entry(&head,
1719 struct pl08x_txd, node);
1720 dma_async_tx_callback callback = txd->tx.callback;
1721 void *callback_param = txd->tx.callback_param;
1723 list_del(&txd->node);
1725 /* Don't try to unmap buffers on slave channels */
1727 pl08x_unmap_buffers(txd);
1729 /* Free the descriptor */
1730 spin_lock_irqsave(&plchan->lock, flags);
1731 pl08x_free_txd(pl08x, txd);
1732 spin_unlock_irqrestore(&plchan->lock, flags);
1734 /* Callback to signal completion */
1736 callback(callback_param);
1740 static irqreturn_t pl08x_irq(int irq, void *dev)
1742 struct pl08x_driver_data *pl08x = dev;
1743 u32 mask = 0, err, tc, i;
1745 /* check & clear - ERR & TC interrupts */
1746 err = readl(pl08x->base + PL080_ERR_STATUS);
1748 dev_err(&pl08x->adev->dev, "%s error interrupt, register value 0x%08x\n",
1750 writel(err, pl08x->base + PL080_ERR_CLEAR);
1752 tc = readl(pl08x->base + PL080_TC_STATUS);
1754 writel(tc, pl08x->base + PL080_TC_CLEAR);
1759 for (i = 0; i < pl08x->vd->channels; i++) {
1760 if (((1 << i) & err) || ((1 << i) & tc)) {
1761 /* Locate physical channel */
1762 struct pl08x_phy_chan *phychan = &pl08x->phy_chans[i];
1763 struct pl08x_dma_chan *plchan = phychan->serving;
1764 struct pl08x_txd *tx;
1767 dev_err(&pl08x->adev->dev,
1768 "%s Error TC interrupt on unused channel: 0x%08x\n",
1773 spin_lock(&plchan->lock);
1778 * This descriptor is done, release its mux
1781 pl08x_release_mux(plchan);
1782 dma_cookie_complete(&tx->tx);
1783 list_add_tail(&tx->node, &plchan->done_list);
1785 spin_unlock(&plchan->lock);
1787 /* Schedule tasklet on this channel */
1788 tasklet_schedule(&plchan->tasklet);
1793 return mask ? IRQ_HANDLED : IRQ_NONE;
1796 static void pl08x_dma_slave_init(struct pl08x_dma_chan *chan)
1799 chan->name = chan->cd->bus_id;
1800 chan->cfg.src_addr = chan->cd->addr;
1801 chan->cfg.dst_addr = chan->cd->addr;
1805 * Initialise the DMAC memcpy/slave channels.
1806 * Make a local wrapper to hold required data
1808 static int pl08x_dma_init_virtual_channels(struct pl08x_driver_data *pl08x,
1809 struct dma_device *dmadev, unsigned int channels, bool slave)
1811 struct pl08x_dma_chan *chan;
1814 INIT_LIST_HEAD(&dmadev->channels);
1817 * Register as many many memcpy as we have physical channels,
1818 * we won't always be able to use all but the code will have
1819 * to cope with that situation.
1821 for (i = 0; i < channels; i++) {
1822 chan = kzalloc(sizeof(*chan), GFP_KERNEL);
1824 dev_err(&pl08x->adev->dev,
1825 "%s no memory for channel\n", __func__);
1830 chan->state = PL08X_CHAN_IDLE;
1834 chan->cd = &pl08x->pd->slave_channels[i];
1835 pl08x_dma_slave_init(chan);
1837 chan->cd = &pl08x->pd->memcpy_channel;
1838 chan->name = kasprintf(GFP_KERNEL, "memcpy%d", i);
1844 dev_dbg(&pl08x->adev->dev,
1845 "initialize virtual channel \"%s\"\n",
1848 chan->chan.device = dmadev;
1849 dma_cookie_init(&chan->chan);
1851 spin_lock_init(&chan->lock);
1852 INIT_LIST_HEAD(&chan->pend_list);
1853 INIT_LIST_HEAD(&chan->done_list);
1854 tasklet_init(&chan->tasklet, pl08x_tasklet,
1855 (unsigned long) chan);
1857 list_add_tail(&chan->chan.device_node, &dmadev->channels);
1859 dev_info(&pl08x->adev->dev, "initialized %d virtual %s channels\n",
1860 i, slave ? "slave" : "memcpy");
1864 static void pl08x_free_virtual_channels(struct dma_device *dmadev)
1866 struct pl08x_dma_chan *chan = NULL;
1867 struct pl08x_dma_chan *next;
1869 list_for_each_entry_safe(chan,
1870 next, &dmadev->channels, chan.device_node) {
1871 list_del(&chan->chan.device_node);
1876 #ifdef CONFIG_DEBUG_FS
1877 static const char *pl08x_state_str(enum pl08x_dma_chan_state state)
1880 case PL08X_CHAN_IDLE:
1882 case PL08X_CHAN_RUNNING:
1884 case PL08X_CHAN_PAUSED:
1886 case PL08X_CHAN_WAITING:
1891 return "UNKNOWN STATE";
1894 static int pl08x_debugfs_show(struct seq_file *s, void *data)
1896 struct pl08x_driver_data *pl08x = s->private;
1897 struct pl08x_dma_chan *chan;
1898 struct pl08x_phy_chan *ch;
1899 unsigned long flags;
1902 seq_printf(s, "PL08x physical channels:\n");
1903 seq_printf(s, "CHANNEL:\tUSER:\n");
1904 seq_printf(s, "--------\t-----\n");
1905 for (i = 0; i < pl08x->vd->channels; i++) {
1906 struct pl08x_dma_chan *virt_chan;
1908 ch = &pl08x->phy_chans[i];
1910 spin_lock_irqsave(&ch->lock, flags);
1911 virt_chan = ch->serving;
1913 seq_printf(s, "%d\t\t%s%s\n",
1915 virt_chan ? virt_chan->name : "(none)",
1916 ch->locked ? " LOCKED" : "");
1918 spin_unlock_irqrestore(&ch->lock, flags);
1921 seq_printf(s, "\nPL08x virtual memcpy channels:\n");
1922 seq_printf(s, "CHANNEL:\tSTATE:\n");
1923 seq_printf(s, "--------\t------\n");
1924 list_for_each_entry(chan, &pl08x->memcpy.channels, chan.device_node) {
1925 seq_printf(s, "%s\t\t%s\n", chan->name,
1926 pl08x_state_str(chan->state));
1929 seq_printf(s, "\nPL08x virtual slave channels:\n");
1930 seq_printf(s, "CHANNEL:\tSTATE:\n");
1931 seq_printf(s, "--------\t------\n");
1932 list_for_each_entry(chan, &pl08x->slave.channels, chan.device_node) {
1933 seq_printf(s, "%s\t\t%s\n", chan->name,
1934 pl08x_state_str(chan->state));
1940 static int pl08x_debugfs_open(struct inode *inode, struct file *file)
1942 return single_open(file, pl08x_debugfs_show, inode->i_private);
1945 static const struct file_operations pl08x_debugfs_operations = {
1946 .open = pl08x_debugfs_open,
1948 .llseek = seq_lseek,
1949 .release = single_release,
1952 static void init_pl08x_debugfs(struct pl08x_driver_data *pl08x)
1954 /* Expose a simple debugfs interface to view all clocks */
1955 (void) debugfs_create_file(dev_name(&pl08x->adev->dev),
1956 S_IFREG | S_IRUGO, NULL, pl08x,
1957 &pl08x_debugfs_operations);
1961 static inline void init_pl08x_debugfs(struct pl08x_driver_data *pl08x)
1966 static int pl08x_probe(struct amba_device *adev, const struct amba_id *id)
1968 struct pl08x_driver_data *pl08x;
1969 const struct vendor_data *vd = id->data;
1973 ret = amba_request_regions(adev, NULL);
1977 /* Create the driver state holder */
1978 pl08x = kzalloc(sizeof(*pl08x), GFP_KERNEL);
1984 /* Initialize memcpy engine */
1985 dma_cap_set(DMA_MEMCPY, pl08x->memcpy.cap_mask);
1986 pl08x->memcpy.dev = &adev->dev;
1987 pl08x->memcpy.device_alloc_chan_resources = pl08x_alloc_chan_resources;
1988 pl08x->memcpy.device_free_chan_resources = pl08x_free_chan_resources;
1989 pl08x->memcpy.device_prep_dma_memcpy = pl08x_prep_dma_memcpy;
1990 pl08x->memcpy.device_prep_dma_interrupt = pl08x_prep_dma_interrupt;
1991 pl08x->memcpy.device_tx_status = pl08x_dma_tx_status;
1992 pl08x->memcpy.device_issue_pending = pl08x_issue_pending;
1993 pl08x->memcpy.device_control = pl08x_control;
1995 /* Initialize slave engine */
1996 dma_cap_set(DMA_SLAVE, pl08x->slave.cap_mask);
1997 pl08x->slave.dev = &adev->dev;
1998 pl08x->slave.device_alloc_chan_resources = pl08x_alloc_chan_resources;
1999 pl08x->slave.device_free_chan_resources = pl08x_free_chan_resources;
2000 pl08x->slave.device_prep_dma_interrupt = pl08x_prep_dma_interrupt;
2001 pl08x->slave.device_tx_status = pl08x_dma_tx_status;
2002 pl08x->slave.device_issue_pending = pl08x_issue_pending;
2003 pl08x->slave.device_prep_slave_sg = pl08x_prep_slave_sg;
2004 pl08x->slave.device_control = pl08x_control;
2006 /* Get the platform data */
2007 pl08x->pd = dev_get_platdata(&adev->dev);
2009 dev_err(&adev->dev, "no platform data supplied\n");
2010 goto out_no_platdata;
2013 /* Assign useful pointers to the driver state */
2017 /* By default, AHB1 only. If dualmaster, from platform */
2018 pl08x->lli_buses = PL08X_AHB1;
2019 pl08x->mem_buses = PL08X_AHB1;
2020 if (pl08x->vd->dualmaster) {
2021 pl08x->lli_buses = pl08x->pd->lli_buses;
2022 pl08x->mem_buses = pl08x->pd->mem_buses;
2025 /* A DMA memory pool for LLIs, align on 1-byte boundary */
2026 pl08x->pool = dma_pool_create(DRIVER_NAME, &pl08x->adev->dev,
2027 PL08X_LLI_TSFR_SIZE, PL08X_ALIGN, 0);
2030 goto out_no_lli_pool;
2033 pl08x->base = ioremap(adev->res.start, resource_size(&adev->res));
2036 goto out_no_ioremap;
2039 /* Turn on the PL08x */
2040 pl08x_ensure_on(pl08x);
2042 /* Attach the interrupt handler */
2043 writel(0x000000FF, pl08x->base + PL080_ERR_CLEAR);
2044 writel(0x000000FF, pl08x->base + PL080_TC_CLEAR);
2046 ret = request_irq(adev->irq[0], pl08x_irq, IRQF_DISABLED,
2047 DRIVER_NAME, pl08x);
2049 dev_err(&adev->dev, "%s failed to request interrupt %d\n",
2050 __func__, adev->irq[0]);
2054 /* Initialize physical channels */
2055 pl08x->phy_chans = kzalloc((vd->channels * sizeof(*pl08x->phy_chans)),
2057 if (!pl08x->phy_chans) {
2058 dev_err(&adev->dev, "%s failed to allocate "
2059 "physical channel holders\n",
2061 goto out_no_phychans;
2064 for (i = 0; i < vd->channels; i++) {
2065 struct pl08x_phy_chan *ch = &pl08x->phy_chans[i];
2068 ch->base = pl08x->base + PL080_Cx_BASE(i);
2069 spin_lock_init(&ch->lock);
2072 * Nomadik variants can have channels that are locked
2073 * down for the secure world only. Lock up these channels
2074 * by perpetually serving a dummy virtual channel.
2079 val = readl(ch->base + PL080_CH_CONFIG);
2080 if (val & (PL080N_CONFIG_ITPROT | PL080N_CONFIG_SECPROT)) {
2081 dev_info(&adev->dev, "physical channel %d reserved for secure access only\n", i);
2086 dev_dbg(&adev->dev, "physical channel %d is %s\n",
2087 i, pl08x_phy_channel_busy(ch) ? "BUSY" : "FREE");
2090 /* Register as many memcpy channels as there are physical channels */
2091 ret = pl08x_dma_init_virtual_channels(pl08x, &pl08x->memcpy,
2092 pl08x->vd->channels, false);
2094 dev_warn(&pl08x->adev->dev,
2095 "%s failed to enumerate memcpy channels - %d\n",
2099 pl08x->memcpy.chancnt = ret;
2101 /* Register slave channels */
2102 ret = pl08x_dma_init_virtual_channels(pl08x, &pl08x->slave,
2103 pl08x->pd->num_slave_channels, true);
2105 dev_warn(&pl08x->adev->dev,
2106 "%s failed to enumerate slave channels - %d\n",
2110 pl08x->slave.chancnt = ret;
2112 ret = dma_async_device_register(&pl08x->memcpy);
2114 dev_warn(&pl08x->adev->dev,
2115 "%s failed to register memcpy as an async device - %d\n",
2117 goto out_no_memcpy_reg;
2120 ret = dma_async_device_register(&pl08x->slave);
2122 dev_warn(&pl08x->adev->dev,
2123 "%s failed to register slave as an async device - %d\n",
2125 goto out_no_slave_reg;
2128 amba_set_drvdata(adev, pl08x);
2129 init_pl08x_debugfs(pl08x);
2130 dev_info(&pl08x->adev->dev, "DMA: PL%03x rev%u at 0x%08llx irq %d\n",
2131 amba_part(adev), amba_rev(adev),
2132 (unsigned long long)adev->res.start, adev->irq[0]);
2137 dma_async_device_unregister(&pl08x->memcpy);
2139 pl08x_free_virtual_channels(&pl08x->slave);
2141 pl08x_free_virtual_channels(&pl08x->memcpy);
2143 kfree(pl08x->phy_chans);
2145 free_irq(adev->irq[0], pl08x);
2147 iounmap(pl08x->base);
2149 dma_pool_destroy(pl08x->pool);
2154 amba_release_regions(adev);
2158 /* PL080 has 8 channels and the PL080 have just 2 */
2159 static struct vendor_data vendor_pl080 = {
2164 static struct vendor_data vendor_nomadik = {
2170 static struct vendor_data vendor_pl081 = {
2172 .dualmaster = false,
2175 static struct amba_id pl08x_ids[] = {
2180 .data = &vendor_pl080,
2186 .data = &vendor_pl081,
2188 /* Nomadik 8815 PL080 variant */
2192 .data = &vendor_nomadik,
2197 MODULE_DEVICE_TABLE(amba, pl08x_ids);
2199 static struct amba_driver pl08x_amba_driver = {
2200 .drv.name = DRIVER_NAME,
2201 .id_table = pl08x_ids,
2202 .probe = pl08x_probe,
2205 static int __init pl08x_init(void)
2208 retval = amba_driver_register(&pl08x_amba_driver);
2210 printk(KERN_WARNING DRIVER_NAME
2211 "failed to register as an AMBA device (%d)\n",
2215 subsys_initcall(pl08x_init);