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 * @issued_list: issued transactions for this channel
221 * @done_list: list of completed transactions
222 * @at: active transaction on this channel
223 * @lock: a lock for this channel data
224 * @host: a pointer to the host (internal use)
225 * @state: whether the channel is idle, paused, running etc
226 * @slave: whether this channel is a device (slave) or for memcpy
227 * @signal: the physical DMA request signal which this channel is using
228 * @mux_use: count of descriptors using this DMA request signal setting
230 struct pl08x_dma_chan {
231 struct dma_chan chan;
232 struct pl08x_phy_chan *phychan;
234 struct tasklet_struct tasklet;
236 const struct pl08x_channel_data *cd;
237 struct dma_slave_config cfg;
238 struct list_head pend_list;
239 struct list_head issued_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;
251 * struct pl08x_driver_data - the local state holder for the PL08x
252 * @slave: slave engine for this instance
253 * @memcpy: memcpy engine for this instance
254 * @base: virtual memory base (remapped) for the PL08x
255 * @adev: the corresponding AMBA (PrimeCell) bus entry
256 * @vd: vendor data for this PL08x variant
257 * @pd: platform data passed in from the platform/machine
258 * @phy_chans: array of data for the physical channels
259 * @pool: a pool for the LLI descriptors
260 * @pool_ctr: counter of LLIs in the pool
261 * @lli_buses: bitmask to or in to LLI pointer selecting AHB port for LLI
263 * @mem_buses: set to indicate memory transfers on AHB2.
264 * @lock: a spinlock for this struct
266 struct pl08x_driver_data {
267 struct dma_device slave;
268 struct dma_device memcpy;
270 struct amba_device *adev;
271 const struct vendor_data *vd;
272 struct pl08x_platform_data *pd;
273 struct pl08x_phy_chan *phy_chans;
274 struct dma_pool *pool;
281 * PL08X specific defines
284 /* Size (bytes) of each LLI buffer allocated for one transfer */
285 # define PL08X_LLI_TSFR_SIZE 0x2000
287 /* Maximum times we call dma_pool_alloc on this pool without freeing */
288 #define MAX_NUM_TSFR_LLIS (PL08X_LLI_TSFR_SIZE/sizeof(struct pl08x_lli))
289 #define PL08X_ALIGN 8
291 static inline struct pl08x_dma_chan *to_pl08x_chan(struct dma_chan *chan)
293 return container_of(chan, struct pl08x_dma_chan, chan);
296 static inline struct pl08x_txd *to_pl08x_txd(struct dma_async_tx_descriptor *tx)
298 return container_of(tx, struct pl08x_txd, tx);
304 * This gives us the DMA request input to the PL08x primecell which the
305 * peripheral described by the channel data will be routed to, possibly
306 * via a board/SoC specific external MUX. One important point to note
307 * here is that this does not depend on the physical channel.
309 static int pl08x_request_mux(struct pl08x_dma_chan *plchan)
311 const struct pl08x_platform_data *pd = plchan->host->pd;
314 if (plchan->mux_use++ == 0 && pd->get_signal) {
315 ret = pd->get_signal(plchan->cd);
321 plchan->signal = ret;
326 static void pl08x_release_mux(struct pl08x_dma_chan *plchan)
328 const struct pl08x_platform_data *pd = plchan->host->pd;
330 if (plchan->signal >= 0) {
331 WARN_ON(plchan->mux_use == 0);
333 if (--plchan->mux_use == 0 && pd->put_signal) {
334 pd->put_signal(plchan->cd, plchan->signal);
341 * Physical channel handling
344 /* Whether a certain channel is busy or not */
345 static int pl08x_phy_channel_busy(struct pl08x_phy_chan *ch)
349 val = readl(ch->base + PL080_CH_CONFIG);
350 return val & PL080_CONFIG_ACTIVE;
354 * Set the initial DMA register values i.e. those for the first LLI
355 * The next LLI pointer and the configuration interrupt bit have
356 * been set when the LLIs were constructed. Poke them into the hardware
357 * and start the transfer.
359 static void pl08x_start_next_txd(struct pl08x_dma_chan *plchan)
361 struct pl08x_driver_data *pl08x = plchan->host;
362 struct pl08x_phy_chan *phychan = plchan->phychan;
363 struct pl08x_lli *lli;
364 struct pl08x_txd *txd;
367 txd = list_first_entry(&plchan->issued_list, struct pl08x_txd, node);
368 list_del(&txd->node);
372 /* Wait for channel inactive */
373 while (pl08x_phy_channel_busy(phychan))
376 lli = &txd->llis_va[0];
378 dev_vdbg(&pl08x->adev->dev,
379 "WRITE channel %d: csrc=0x%08x, cdst=0x%08x, "
380 "clli=0x%08x, cctl=0x%08x, ccfg=0x%08x\n",
381 phychan->id, lli->src, lli->dst, lli->lli, lli->cctl,
384 writel(lli->src, phychan->base + PL080_CH_SRC_ADDR);
385 writel(lli->dst, phychan->base + PL080_CH_DST_ADDR);
386 writel(lli->lli, phychan->base + PL080_CH_LLI);
387 writel(lli->cctl, phychan->base + PL080_CH_CONTROL);
388 writel(txd->ccfg, phychan->base + PL080_CH_CONFIG);
390 /* Enable the DMA channel */
391 /* Do not access config register until channel shows as disabled */
392 while (readl(pl08x->base + PL080_EN_CHAN) & (1 << phychan->id))
395 /* Do not access config register until channel shows as inactive */
396 val = readl(phychan->base + PL080_CH_CONFIG);
397 while ((val & PL080_CONFIG_ACTIVE) || (val & PL080_CONFIG_ENABLE))
398 val = readl(phychan->base + PL080_CH_CONFIG);
400 writel(val | PL080_CONFIG_ENABLE, phychan->base + PL080_CH_CONFIG);
404 * Pause the channel by setting the HALT bit.
406 * For M->P transfers, pause the DMAC first and then stop the peripheral -
407 * the FIFO can only drain if the peripheral is still requesting data.
408 * (note: this can still timeout if the DMAC FIFO never drains of data.)
410 * For P->M transfers, disable the peripheral first to stop it filling
411 * the DMAC FIFO, and then pause the DMAC.
413 static void pl08x_pause_phy_chan(struct pl08x_phy_chan *ch)
418 /* Set the HALT bit and wait for the FIFO to drain */
419 val = readl(ch->base + PL080_CH_CONFIG);
420 val |= PL080_CONFIG_HALT;
421 writel(val, ch->base + PL080_CH_CONFIG);
423 /* Wait for channel inactive */
424 for (timeout = 1000; timeout; timeout--) {
425 if (!pl08x_phy_channel_busy(ch))
429 if (pl08x_phy_channel_busy(ch))
430 pr_err("pl08x: channel%u timeout waiting for pause\n", ch->id);
433 static void pl08x_resume_phy_chan(struct pl08x_phy_chan *ch)
437 /* Clear the HALT bit */
438 val = readl(ch->base + PL080_CH_CONFIG);
439 val &= ~PL080_CONFIG_HALT;
440 writel(val, ch->base + PL080_CH_CONFIG);
444 * pl08x_terminate_phy_chan() stops the channel, clears the FIFO and
445 * clears any pending interrupt status. This should not be used for
446 * an on-going transfer, but as a method of shutting down a channel
447 * (eg, when it's no longer used) or terminating a transfer.
449 static void pl08x_terminate_phy_chan(struct pl08x_driver_data *pl08x,
450 struct pl08x_phy_chan *ch)
452 u32 val = readl(ch->base + PL080_CH_CONFIG);
454 val &= ~(PL080_CONFIG_ENABLE | PL080_CONFIG_ERR_IRQ_MASK |
455 PL080_CONFIG_TC_IRQ_MASK);
457 writel(val, ch->base + PL080_CH_CONFIG);
459 writel(1 << ch->id, pl08x->base + PL080_ERR_CLEAR);
460 writel(1 << ch->id, pl08x->base + PL080_TC_CLEAR);
463 static inline u32 get_bytes_in_cctl(u32 cctl)
465 /* The source width defines the number of bytes */
466 u32 bytes = cctl & PL080_CONTROL_TRANSFER_SIZE_MASK;
468 switch (cctl >> PL080_CONTROL_SWIDTH_SHIFT) {
469 case PL080_WIDTH_8BIT:
471 case PL080_WIDTH_16BIT:
474 case PL080_WIDTH_32BIT:
481 /* The channel should be paused when calling this */
482 static u32 pl08x_getbytes_chan(struct pl08x_dma_chan *plchan)
484 struct pl08x_phy_chan *ch;
485 struct pl08x_txd *txd;
489 spin_lock_irqsave(&plchan->lock, flags);
490 ch = plchan->phychan;
494 * Follow the LLIs to get the number of remaining
495 * bytes in the currently active transaction.
498 u32 clli = readl(ch->base + PL080_CH_LLI) & ~PL080_LLI_LM_AHB2;
500 /* First get the remaining bytes in the active transfer */
501 bytes = get_bytes_in_cctl(readl(ch->base + PL080_CH_CONTROL));
504 struct pl08x_lli *llis_va = txd->llis_va;
505 dma_addr_t llis_bus = txd->llis_bus;
508 BUG_ON(clli < llis_bus || clli >= llis_bus +
509 sizeof(struct pl08x_lli) * MAX_NUM_TSFR_LLIS);
512 * Locate the next LLI - as this is an array,
513 * it's simple maths to find.
515 index = (clli - llis_bus) / sizeof(struct pl08x_lli);
517 for (; index < MAX_NUM_TSFR_LLIS; index++) {
518 bytes += get_bytes_in_cctl(llis_va[index].cctl);
521 * A LLI pointer of 0 terminates the LLI list
523 if (!llis_va[index].lli)
529 /* Sum up all queued transactions */
530 if (!list_empty(&plchan->issued_list)) {
531 struct pl08x_txd *txdi;
532 list_for_each_entry(txdi, &plchan->issued_list, node) {
533 struct pl08x_sg *dsg;
534 list_for_each_entry(dsg, &txd->dsg_list, node)
539 if (!list_empty(&plchan->pend_list)) {
540 struct pl08x_txd *txdi;
541 list_for_each_entry(txdi, &plchan->pend_list, node) {
542 struct pl08x_sg *dsg;
543 list_for_each_entry(dsg, &txd->dsg_list, node)
548 spin_unlock_irqrestore(&plchan->lock, flags);
554 * Allocate a physical channel for a virtual channel
556 * Try to locate a physical channel to be used for this transfer. If all
557 * are taken return NULL and the requester will have to cope by using
558 * some fallback PIO mode or retrying later.
560 static struct pl08x_phy_chan *
561 pl08x_get_phy_channel(struct pl08x_driver_data *pl08x,
562 struct pl08x_dma_chan *virt_chan)
564 struct pl08x_phy_chan *ch = NULL;
568 for (i = 0; i < pl08x->vd->channels; i++) {
569 ch = &pl08x->phy_chans[i];
571 spin_lock_irqsave(&ch->lock, flags);
573 if (!ch->locked && !ch->serving) {
574 ch->serving = virt_chan;
575 spin_unlock_irqrestore(&ch->lock, flags);
579 spin_unlock_irqrestore(&ch->lock, flags);
582 if (i == pl08x->vd->channels) {
583 /* No physical channel available, cope with it */
590 static inline void pl08x_put_phy_channel(struct pl08x_driver_data *pl08x,
591 struct pl08x_phy_chan *ch)
595 spin_lock_irqsave(&ch->lock, flags);
597 /* Stop the channel and clear its interrupts */
598 pl08x_terminate_phy_chan(pl08x, ch);
600 /* Mark it as free */
602 spin_unlock_irqrestore(&ch->lock, flags);
609 static inline unsigned int pl08x_get_bytes_for_cctl(unsigned int coded)
612 case PL080_WIDTH_8BIT:
614 case PL080_WIDTH_16BIT:
616 case PL080_WIDTH_32BIT:
625 static inline u32 pl08x_cctl_bits(u32 cctl, u8 srcwidth, u8 dstwidth,
630 /* Remove all src, dst and transfer size bits */
631 retbits &= ~PL080_CONTROL_DWIDTH_MASK;
632 retbits &= ~PL080_CONTROL_SWIDTH_MASK;
633 retbits &= ~PL080_CONTROL_TRANSFER_SIZE_MASK;
635 /* Then set the bits according to the parameters */
638 retbits |= PL080_WIDTH_8BIT << PL080_CONTROL_SWIDTH_SHIFT;
641 retbits |= PL080_WIDTH_16BIT << PL080_CONTROL_SWIDTH_SHIFT;
644 retbits |= PL080_WIDTH_32BIT << PL080_CONTROL_SWIDTH_SHIFT;
653 retbits |= PL080_WIDTH_8BIT << PL080_CONTROL_DWIDTH_SHIFT;
656 retbits |= PL080_WIDTH_16BIT << PL080_CONTROL_DWIDTH_SHIFT;
659 retbits |= PL080_WIDTH_32BIT << PL080_CONTROL_DWIDTH_SHIFT;
666 retbits |= tsize << PL080_CONTROL_TRANSFER_SIZE_SHIFT;
670 struct pl08x_lli_build_data {
671 struct pl08x_txd *txd;
672 struct pl08x_bus_data srcbus;
673 struct pl08x_bus_data dstbus;
679 * Autoselect a master bus to use for the transfer. Slave will be the chosen as
680 * victim in case src & dest are not similarly aligned. i.e. If after aligning
681 * masters address with width requirements of transfer (by sending few byte by
682 * byte data), slave is still not aligned, then its width will be reduced to
684 * - prefers the destination bus if both available
685 * - prefers bus with fixed address (i.e. peripheral)
687 static void pl08x_choose_master_bus(struct pl08x_lli_build_data *bd,
688 struct pl08x_bus_data **mbus, struct pl08x_bus_data **sbus, u32 cctl)
690 if (!(cctl & PL080_CONTROL_DST_INCR)) {
693 } else if (!(cctl & PL080_CONTROL_SRC_INCR)) {
697 if (bd->dstbus.buswidth >= bd->srcbus.buswidth) {
708 * Fills in one LLI for a certain transfer descriptor and advance the counter
710 static void pl08x_fill_lli_for_desc(struct pl08x_lli_build_data *bd,
711 int num_llis, int len, u32 cctl)
713 struct pl08x_lli *llis_va = bd->txd->llis_va;
714 dma_addr_t llis_bus = bd->txd->llis_bus;
716 BUG_ON(num_llis >= MAX_NUM_TSFR_LLIS);
718 llis_va[num_llis].cctl = cctl;
719 llis_va[num_llis].src = bd->srcbus.addr;
720 llis_va[num_llis].dst = bd->dstbus.addr;
721 llis_va[num_llis].lli = llis_bus + (num_llis + 1) *
722 sizeof(struct pl08x_lli);
723 llis_va[num_llis].lli |= bd->lli_bus;
725 if (cctl & PL080_CONTROL_SRC_INCR)
726 bd->srcbus.addr += len;
727 if (cctl & PL080_CONTROL_DST_INCR)
728 bd->dstbus.addr += len;
730 BUG_ON(bd->remainder < len);
732 bd->remainder -= len;
735 static inline void prep_byte_width_lli(struct pl08x_lli_build_data *bd,
736 u32 *cctl, u32 len, int num_llis, size_t *total_bytes)
738 *cctl = pl08x_cctl_bits(*cctl, 1, 1, len);
739 pl08x_fill_lli_for_desc(bd, num_llis, len, *cctl);
740 (*total_bytes) += len;
744 * This fills in the table of LLIs for the transfer descriptor
745 * Note that we assume we never have to change the burst sizes
748 static int pl08x_fill_llis_for_desc(struct pl08x_driver_data *pl08x,
749 struct pl08x_txd *txd)
751 struct pl08x_bus_data *mbus, *sbus;
752 struct pl08x_lli_build_data bd;
754 u32 cctl, early_bytes = 0;
755 size_t max_bytes_per_lli, total_bytes;
756 struct pl08x_lli *llis_va;
757 struct pl08x_sg *dsg;
759 txd->llis_va = dma_pool_alloc(pl08x->pool, GFP_NOWAIT, &txd->llis_bus);
761 dev_err(&pl08x->adev->dev, "%s no memory for llis\n", __func__);
768 bd.lli_bus = (pl08x->lli_buses & PL08X_AHB2) ? PL080_LLI_LM_AHB2 : 0;
771 /* Find maximum width of the source bus */
773 pl08x_get_bytes_for_cctl((cctl & PL080_CONTROL_SWIDTH_MASK) >>
774 PL080_CONTROL_SWIDTH_SHIFT);
776 /* Find maximum width of the destination bus */
778 pl08x_get_bytes_for_cctl((cctl & PL080_CONTROL_DWIDTH_MASK) >>
779 PL080_CONTROL_DWIDTH_SHIFT);
781 list_for_each_entry(dsg, &txd->dsg_list, node) {
785 bd.srcbus.addr = dsg->src_addr;
786 bd.dstbus.addr = dsg->dst_addr;
787 bd.remainder = dsg->len;
788 bd.srcbus.buswidth = bd.srcbus.maxwidth;
789 bd.dstbus.buswidth = bd.dstbus.maxwidth;
791 pl08x_choose_master_bus(&bd, &mbus, &sbus, cctl);
793 dev_vdbg(&pl08x->adev->dev, "src=0x%08x%s/%u dst=0x%08x%s/%u len=%zu\n",
794 bd.srcbus.addr, cctl & PL080_CONTROL_SRC_INCR ? "+" : "",
796 bd.dstbus.addr, cctl & PL080_CONTROL_DST_INCR ? "+" : "",
799 dev_vdbg(&pl08x->adev->dev, "mbus=%s sbus=%s\n",
800 mbus == &bd.srcbus ? "src" : "dst",
801 sbus == &bd.srcbus ? "src" : "dst");
804 * Zero length is only allowed if all these requirements are
806 * - flow controller is peripheral.
807 * - src.addr is aligned to src.width
808 * - dst.addr is aligned to dst.width
810 * sg_len == 1 should be true, as there can be two cases here:
812 * - Memory addresses are contiguous and are not scattered.
813 * Here, Only one sg will be passed by user driver, with
814 * memory address and zero length. We pass this to controller
815 * and after the transfer it will receive the last burst
816 * request from peripheral and so transfer finishes.
818 * - Memory addresses are scattered and are not contiguous.
819 * Here, Obviously as DMA controller doesn't know when a lli's
820 * transfer gets over, it can't load next lli. So in this
821 * case, there has to be an assumption that only one lli is
822 * supported. Thus, we can't have scattered addresses.
825 u32 fc = (txd->ccfg & PL080_CONFIG_FLOW_CONTROL_MASK) >>
826 PL080_CONFIG_FLOW_CONTROL_SHIFT;
827 if (!((fc >= PL080_FLOW_SRC2DST_DST) &&
828 (fc <= PL080_FLOW_SRC2DST_SRC))) {
829 dev_err(&pl08x->adev->dev, "%s sg len can't be zero",
834 if ((bd.srcbus.addr % bd.srcbus.buswidth) ||
835 (bd.dstbus.addr % bd.dstbus.buswidth)) {
836 dev_err(&pl08x->adev->dev,
837 "%s src & dst address must be aligned to src"
838 " & dst width if peripheral is flow controller",
843 cctl = pl08x_cctl_bits(cctl, bd.srcbus.buswidth,
844 bd.dstbus.buswidth, 0);
845 pl08x_fill_lli_for_desc(&bd, num_llis++, 0, cctl);
850 * Send byte by byte for following cases
851 * - Less than a bus width available
852 * - until master bus is aligned
854 if (bd.remainder < mbus->buswidth)
855 early_bytes = bd.remainder;
856 else if ((mbus->addr) % (mbus->buswidth)) {
857 early_bytes = mbus->buswidth - (mbus->addr) %
859 if ((bd.remainder - early_bytes) < mbus->buswidth)
860 early_bytes = bd.remainder;
864 dev_vdbg(&pl08x->adev->dev,
865 "%s byte width LLIs (remain 0x%08x)\n",
866 __func__, bd.remainder);
867 prep_byte_width_lli(&bd, &cctl, early_bytes, num_llis++,
874 * - if slave is not then we must set its width down
876 if (sbus->addr % sbus->buswidth) {
877 dev_dbg(&pl08x->adev->dev,
878 "%s set down bus width to one byte\n",
885 * Bytes transferred = tsize * src width, not
888 max_bytes_per_lli = bd.srcbus.buswidth *
889 PL080_CONTROL_TRANSFER_SIZE_MASK;
890 dev_vdbg(&pl08x->adev->dev,
891 "%s max bytes per lli = %zu\n",
892 __func__, max_bytes_per_lli);
895 * Make largest possible LLIs until less than one bus
898 while (bd.remainder > (mbus->buswidth - 1)) {
899 size_t lli_len, tsize, width;
902 * If enough left try to send max possible,
903 * otherwise try to send the remainder
905 lli_len = min(bd.remainder, max_bytes_per_lli);
908 * Check against maximum bus alignment:
909 * Calculate actual transfer size in relation to
910 * bus width an get a maximum remainder of the
911 * highest bus width - 1
913 width = max(mbus->buswidth, sbus->buswidth);
914 lli_len = (lli_len / width) * width;
915 tsize = lli_len / bd.srcbus.buswidth;
917 dev_vdbg(&pl08x->adev->dev,
918 "%s fill lli with single lli chunk of "
919 "size 0x%08zx (remainder 0x%08zx)\n",
920 __func__, lli_len, bd.remainder);
922 cctl = pl08x_cctl_bits(cctl, bd.srcbus.buswidth,
923 bd.dstbus.buswidth, tsize);
924 pl08x_fill_lli_for_desc(&bd, num_llis++,
926 total_bytes += lli_len;
933 dev_vdbg(&pl08x->adev->dev,
934 "%s align with boundary, send odd bytes (remain %zu)\n",
935 __func__, bd.remainder);
936 prep_byte_width_lli(&bd, &cctl, bd.remainder,
937 num_llis++, &total_bytes);
941 if (total_bytes != dsg->len) {
942 dev_err(&pl08x->adev->dev,
943 "%s size of encoded lli:s don't match total txd, transferred 0x%08zx from size 0x%08zx\n",
944 __func__, total_bytes, dsg->len);
948 if (num_llis >= MAX_NUM_TSFR_LLIS) {
949 dev_err(&pl08x->adev->dev,
950 "%s need to increase MAX_NUM_TSFR_LLIS from 0x%08x\n",
951 __func__, (u32) MAX_NUM_TSFR_LLIS);
956 llis_va = txd->llis_va;
957 /* The final LLI terminates the LLI. */
958 llis_va[num_llis - 1].lli = 0;
959 /* The final LLI element shall also fire an interrupt. */
960 llis_va[num_llis - 1].cctl |= PL080_CONTROL_TC_IRQ_EN;
966 dev_vdbg(&pl08x->adev->dev,
967 "%-3s %-9s %-10s %-10s %-10s %s\n",
968 "lli", "", "csrc", "cdst", "clli", "cctl");
969 for (i = 0; i < num_llis; i++) {
970 dev_vdbg(&pl08x->adev->dev,
971 "%3d @%p: 0x%08x 0x%08x 0x%08x 0x%08x\n",
972 i, &llis_va[i], llis_va[i].src,
973 llis_va[i].dst, llis_va[i].lli, llis_va[i].cctl
982 /* You should call this with the struct pl08x lock held */
983 static void pl08x_free_txd(struct pl08x_driver_data *pl08x,
984 struct pl08x_txd *txd)
986 struct pl08x_sg *dsg, *_dsg;
990 dma_pool_free(pl08x->pool, txd->llis_va, txd->llis_bus);
994 list_for_each_entry_safe(dsg, _dsg, &txd->dsg_list, node) {
995 list_del(&dsg->node);
1002 static void pl08x_free_txd_list(struct pl08x_driver_data *pl08x,
1003 struct pl08x_dma_chan *plchan)
1006 struct pl08x_txd *txd;
1008 list_splice_tail_init(&plchan->issued_list, &head);
1009 list_splice_tail_init(&plchan->pend_list, &head);
1011 while (!list_empty(&head)) {
1012 txd = list_first_entry(&head, struct pl08x_txd, node);
1013 pl08x_release_mux(plchan);
1014 list_del(&txd->node);
1015 pl08x_free_txd(pl08x, txd);
1020 * The DMA ENGINE API
1022 static int pl08x_alloc_chan_resources(struct dma_chan *chan)
1027 static void pl08x_free_chan_resources(struct dma_chan *chan)
1032 * This should be called with the channel plchan->lock held
1034 static int prep_phy_channel(struct pl08x_dma_chan *plchan)
1036 struct pl08x_driver_data *pl08x = plchan->host;
1037 struct pl08x_phy_chan *ch;
1039 /* Check if we already have a channel */
1040 if (plchan->phychan) {
1041 ch = plchan->phychan;
1045 ch = pl08x_get_phy_channel(pl08x, plchan);
1047 /* No physical channel available, cope with it */
1048 dev_dbg(&pl08x->adev->dev, "no physical channel available for xfer on %s\n", plchan->name);
1052 plchan->phychan = ch;
1053 dev_dbg(&pl08x->adev->dev, "allocated physical channel %d for xfer on %s\n",
1054 ch->id, plchan->name);
1057 plchan->phychan_hold++;
1062 static void release_phy_channel(struct pl08x_dma_chan *plchan)
1064 struct pl08x_driver_data *pl08x = plchan->host;
1066 pl08x_put_phy_channel(pl08x, plchan->phychan);
1067 plchan->phychan = NULL;
1070 static dma_cookie_t pl08x_tx_submit(struct dma_async_tx_descriptor *tx)
1072 struct pl08x_dma_chan *plchan = to_pl08x_chan(tx->chan);
1073 struct pl08x_txd *txd = to_pl08x_txd(tx);
1074 unsigned long flags;
1075 dma_cookie_t cookie;
1077 spin_lock_irqsave(&plchan->lock, flags);
1078 cookie = dma_cookie_assign(tx);
1080 /* Put this onto the pending list */
1081 list_add_tail(&txd->node, &plchan->pend_list);
1084 * If there was no physical channel available for this memcpy,
1085 * stack the request up and indicate that the channel is waiting
1086 * for a free physical channel.
1088 if (!plchan->slave && !plchan->phychan) {
1089 /* Do this memcpy whenever there is a channel ready */
1090 plchan->state = PL08X_CHAN_WAITING;
1092 plchan->phychan_hold--;
1095 spin_unlock_irqrestore(&plchan->lock, flags);
1100 static struct dma_async_tx_descriptor *pl08x_prep_dma_interrupt(
1101 struct dma_chan *chan, unsigned long flags)
1103 struct dma_async_tx_descriptor *retval = NULL;
1109 * Code accessing dma_async_is_complete() in a tight loop may give problems.
1110 * If slaves are relying on interrupts to signal completion this function
1111 * must not be called with interrupts disabled.
1113 static enum dma_status pl08x_dma_tx_status(struct dma_chan *chan,
1114 dma_cookie_t cookie, struct dma_tx_state *txstate)
1116 struct pl08x_dma_chan *plchan = to_pl08x_chan(chan);
1117 enum dma_status ret;
1119 ret = dma_cookie_status(chan, cookie, txstate);
1120 if (ret == DMA_SUCCESS)
1124 * This cookie not complete yet
1125 * Get number of bytes left in the active transactions and queue
1127 dma_set_residue(txstate, pl08x_getbytes_chan(plchan));
1129 if (plchan->state == PL08X_CHAN_PAUSED)
1132 /* Whether waiting or running, we're in progress */
1133 return DMA_IN_PROGRESS;
1136 /* PrimeCell DMA extension */
1137 struct burst_table {
1142 static const struct burst_table burst_sizes[] = {
1145 .reg = PL080_BSIZE_256,
1149 .reg = PL080_BSIZE_128,
1153 .reg = PL080_BSIZE_64,
1157 .reg = PL080_BSIZE_32,
1161 .reg = PL080_BSIZE_16,
1165 .reg = PL080_BSIZE_8,
1169 .reg = PL080_BSIZE_4,
1173 .reg = PL080_BSIZE_1,
1178 * Given the source and destination available bus masks, select which
1179 * will be routed to each port. We try to have source and destination
1180 * on separate ports, but always respect the allowable settings.
1182 static u32 pl08x_select_bus(u8 src, u8 dst)
1186 if (!(dst & PL08X_AHB1) || ((dst & PL08X_AHB2) && (src & PL08X_AHB1)))
1187 cctl |= PL080_CONTROL_DST_AHB2;
1188 if (!(src & PL08X_AHB1) || ((src & PL08X_AHB2) && !(dst & PL08X_AHB2)))
1189 cctl |= PL080_CONTROL_SRC_AHB2;
1194 static u32 pl08x_cctl(u32 cctl)
1196 cctl &= ~(PL080_CONTROL_SRC_AHB2 | PL080_CONTROL_DST_AHB2 |
1197 PL080_CONTROL_SRC_INCR | PL080_CONTROL_DST_INCR |
1198 PL080_CONTROL_PROT_MASK);
1200 /* Access the cell in privileged mode, non-bufferable, non-cacheable */
1201 return cctl | PL080_CONTROL_PROT_SYS;
1204 static u32 pl08x_width(enum dma_slave_buswidth width)
1207 case DMA_SLAVE_BUSWIDTH_1_BYTE:
1208 return PL080_WIDTH_8BIT;
1209 case DMA_SLAVE_BUSWIDTH_2_BYTES:
1210 return PL080_WIDTH_16BIT;
1211 case DMA_SLAVE_BUSWIDTH_4_BYTES:
1212 return PL080_WIDTH_32BIT;
1218 static u32 pl08x_burst(u32 maxburst)
1222 for (i = 0; i < ARRAY_SIZE(burst_sizes); i++)
1223 if (burst_sizes[i].burstwords <= maxburst)
1226 return burst_sizes[i].reg;
1229 static u32 pl08x_get_cctl(struct pl08x_dma_chan *plchan,
1230 enum dma_slave_buswidth addr_width, u32 maxburst)
1232 u32 width, burst, cctl = 0;
1234 width = pl08x_width(addr_width);
1238 cctl |= width << PL080_CONTROL_SWIDTH_SHIFT;
1239 cctl |= width << PL080_CONTROL_DWIDTH_SHIFT;
1242 * If this channel will only request single transfers, set this
1243 * down to ONE element. Also select one element if no maxburst
1246 if (plchan->cd->single)
1249 burst = pl08x_burst(maxburst);
1250 cctl |= burst << PL080_CONTROL_SB_SIZE_SHIFT;
1251 cctl |= burst << PL080_CONTROL_DB_SIZE_SHIFT;
1253 return pl08x_cctl(cctl);
1256 static int dma_set_runtime_config(struct dma_chan *chan,
1257 struct dma_slave_config *config)
1259 struct pl08x_dma_chan *plchan = to_pl08x_chan(chan);
1264 /* Reject definitely invalid configurations */
1265 if (config->src_addr_width == DMA_SLAVE_BUSWIDTH_8_BYTES ||
1266 config->dst_addr_width == DMA_SLAVE_BUSWIDTH_8_BYTES)
1269 plchan->cfg = *config;
1275 * Slave transactions callback to the slave device to allow
1276 * synchronization of slave DMA signals with the DMAC enable
1278 static void pl08x_issue_pending(struct dma_chan *chan)
1280 struct pl08x_dma_chan *plchan = to_pl08x_chan(chan);
1281 unsigned long flags;
1283 spin_lock_irqsave(&plchan->lock, flags);
1284 list_splice_tail_init(&plchan->pend_list, &plchan->issued_list);
1286 /* Something is already active, or we're waiting for a channel... */
1287 if (plchan->at || plchan->state == PL08X_CHAN_WAITING) {
1288 spin_unlock_irqrestore(&plchan->lock, flags);
1292 /* Take the first element in the queue and execute it */
1293 if (!list_empty(&plchan->issued_list)) {
1294 plchan->state = PL08X_CHAN_RUNNING;
1295 pl08x_start_next_txd(plchan);
1298 spin_unlock_irqrestore(&plchan->lock, flags);
1301 static int pl08x_prep_channel_resources(struct pl08x_dma_chan *plchan,
1302 struct pl08x_txd *txd)
1304 struct pl08x_driver_data *pl08x = plchan->host;
1305 unsigned long flags;
1308 num_llis = pl08x_fill_llis_for_desc(pl08x, txd);
1310 spin_lock_irqsave(&plchan->lock, flags);
1311 pl08x_free_txd(pl08x, txd);
1312 spin_unlock_irqrestore(&plchan->lock, flags);
1316 spin_lock_irqsave(&plchan->lock, flags);
1319 * See if we already have a physical channel allocated,
1320 * else this is the time to try to get one.
1322 ret = prep_phy_channel(plchan);
1325 * No physical channel was available.
1327 * memcpy transfers can be sorted out at submission time.
1329 if (plchan->slave) {
1330 pl08x_free_txd_list(pl08x, plchan);
1331 pl08x_free_txd(pl08x, txd);
1332 spin_unlock_irqrestore(&plchan->lock, flags);
1337 * Else we're all set, paused and ready to roll, status
1338 * will switch to PL08X_CHAN_RUNNING when we call
1339 * issue_pending(). If there is something running on the
1340 * channel already we don't change its state.
1342 if (plchan->state == PL08X_CHAN_IDLE)
1343 plchan->state = PL08X_CHAN_PAUSED;
1345 spin_unlock_irqrestore(&plchan->lock, flags);
1350 static struct pl08x_txd *pl08x_get_txd(struct pl08x_dma_chan *plchan,
1351 unsigned long flags)
1353 struct pl08x_txd *txd = kzalloc(sizeof(*txd), GFP_NOWAIT);
1356 dma_async_tx_descriptor_init(&txd->tx, &plchan->chan);
1357 txd->tx.flags = flags;
1358 txd->tx.tx_submit = pl08x_tx_submit;
1359 INIT_LIST_HEAD(&txd->node);
1360 INIT_LIST_HEAD(&txd->dsg_list);
1362 /* Always enable error and terminal interrupts */
1363 txd->ccfg = PL080_CONFIG_ERR_IRQ_MASK |
1364 PL080_CONFIG_TC_IRQ_MASK;
1370 * Initialize a descriptor to be used by memcpy submit
1372 static struct dma_async_tx_descriptor *pl08x_prep_dma_memcpy(
1373 struct dma_chan *chan, dma_addr_t dest, dma_addr_t src,
1374 size_t len, unsigned long flags)
1376 struct pl08x_dma_chan *plchan = to_pl08x_chan(chan);
1377 struct pl08x_driver_data *pl08x = plchan->host;
1378 struct pl08x_txd *txd;
1379 struct pl08x_sg *dsg;
1382 txd = pl08x_get_txd(plchan, flags);
1384 dev_err(&pl08x->adev->dev,
1385 "%s no memory for descriptor\n", __func__);
1389 dsg = kzalloc(sizeof(struct pl08x_sg), GFP_NOWAIT);
1391 pl08x_free_txd(pl08x, txd);
1392 dev_err(&pl08x->adev->dev, "%s no memory for pl080 sg\n",
1396 list_add_tail(&dsg->node, &txd->dsg_list);
1398 dsg->src_addr = src;
1399 dsg->dst_addr = dest;
1402 /* Set platform data for m2m */
1403 txd->ccfg |= PL080_FLOW_MEM2MEM << PL080_CONFIG_FLOW_CONTROL_SHIFT;
1404 txd->cctl = pl08x->pd->memcpy_channel.cctl_memcpy &
1405 ~(PL080_CONTROL_DST_AHB2 | PL080_CONTROL_SRC_AHB2);
1407 /* Both to be incremented or the code will break */
1408 txd->cctl |= PL080_CONTROL_SRC_INCR | PL080_CONTROL_DST_INCR;
1410 if (pl08x->vd->dualmaster)
1411 txd->cctl |= pl08x_select_bus(pl08x->mem_buses,
1414 ret = pl08x_prep_channel_resources(plchan, txd);
1421 static struct dma_async_tx_descriptor *pl08x_prep_slave_sg(
1422 struct dma_chan *chan, struct scatterlist *sgl,
1423 unsigned int sg_len, enum dma_transfer_direction direction,
1424 unsigned long flags, void *context)
1426 struct pl08x_dma_chan *plchan = to_pl08x_chan(chan);
1427 struct pl08x_driver_data *pl08x = plchan->host;
1428 struct pl08x_txd *txd;
1429 struct pl08x_sg *dsg;
1430 struct scatterlist *sg;
1431 enum dma_slave_buswidth addr_width;
1432 dma_addr_t slave_addr;
1434 u8 src_buses, dst_buses;
1437 dev_dbg(&pl08x->adev->dev, "%s prepare transaction of %d bytes from %s\n",
1438 __func__, sg_dma_len(sgl), plchan->name);
1440 txd = pl08x_get_txd(plchan, flags);
1442 dev_err(&pl08x->adev->dev, "%s no txd\n", __func__);
1447 * Set up addresses, the PrimeCell configured address
1448 * will take precedence since this may configure the
1449 * channel target address dynamically at runtime.
1451 if (direction == DMA_MEM_TO_DEV) {
1452 cctl = PL080_CONTROL_SRC_INCR;
1453 slave_addr = plchan->cfg.dst_addr;
1454 addr_width = plchan->cfg.dst_addr_width;
1455 maxburst = plchan->cfg.dst_maxburst;
1456 src_buses = pl08x->mem_buses;
1457 dst_buses = plchan->cd->periph_buses;
1458 } else if (direction == DMA_DEV_TO_MEM) {
1459 cctl = PL080_CONTROL_DST_INCR;
1460 slave_addr = plchan->cfg.src_addr;
1461 addr_width = plchan->cfg.src_addr_width;
1462 maxburst = plchan->cfg.src_maxburst;
1463 src_buses = plchan->cd->periph_buses;
1464 dst_buses = pl08x->mem_buses;
1466 pl08x_free_txd(pl08x, txd);
1467 dev_err(&pl08x->adev->dev,
1468 "%s direction unsupported\n", __func__);
1472 cctl |= pl08x_get_cctl(plchan, addr_width, maxburst);
1474 pl08x_free_txd(pl08x, txd);
1475 dev_err(&pl08x->adev->dev,
1476 "DMA slave configuration botched?\n");
1480 txd->cctl = cctl | pl08x_select_bus(src_buses, dst_buses);
1482 if (plchan->cfg.device_fc)
1483 tmp = (direction == DMA_MEM_TO_DEV) ? PL080_FLOW_MEM2PER_PER :
1484 PL080_FLOW_PER2MEM_PER;
1486 tmp = (direction == DMA_MEM_TO_DEV) ? PL080_FLOW_MEM2PER :
1489 txd->ccfg |= tmp << PL080_CONFIG_FLOW_CONTROL_SHIFT;
1491 ret = pl08x_request_mux(plchan);
1493 pl08x_free_txd(pl08x, txd);
1494 dev_dbg(&pl08x->adev->dev,
1495 "unable to mux for transfer on %s due to platform restrictions\n",
1500 dev_dbg(&pl08x->adev->dev, "allocated DMA request signal %d for xfer on %s\n",
1501 plchan->signal, plchan->name);
1503 /* Assign the flow control signal to this channel */
1504 if (direction == DMA_MEM_TO_DEV)
1505 txd->ccfg |= plchan->signal << PL080_CONFIG_DST_SEL_SHIFT;
1507 txd->ccfg |= plchan->signal << PL080_CONFIG_SRC_SEL_SHIFT;
1509 for_each_sg(sgl, sg, sg_len, tmp) {
1510 dsg = kzalloc(sizeof(struct pl08x_sg), GFP_NOWAIT);
1512 pl08x_release_mux(plchan);
1513 pl08x_free_txd(pl08x, txd);
1514 dev_err(&pl08x->adev->dev, "%s no mem for pl080 sg\n",
1518 list_add_tail(&dsg->node, &txd->dsg_list);
1520 dsg->len = sg_dma_len(sg);
1521 if (direction == DMA_MEM_TO_DEV) {
1522 dsg->src_addr = sg_dma_address(sg);
1523 dsg->dst_addr = slave_addr;
1525 dsg->src_addr = slave_addr;
1526 dsg->dst_addr = sg_dma_address(sg);
1530 ret = pl08x_prep_channel_resources(plchan, txd);
1537 static int pl08x_control(struct dma_chan *chan, enum dma_ctrl_cmd cmd,
1540 struct pl08x_dma_chan *plchan = to_pl08x_chan(chan);
1541 struct pl08x_driver_data *pl08x = plchan->host;
1542 unsigned long flags;
1545 /* Controls applicable to inactive channels */
1546 if (cmd == DMA_SLAVE_CONFIG) {
1547 return dma_set_runtime_config(chan,
1548 (struct dma_slave_config *)arg);
1552 * Anything succeeds on channels with no physical allocation and
1553 * no queued transfers.
1555 spin_lock_irqsave(&plchan->lock, flags);
1556 if (!plchan->phychan && !plchan->at) {
1557 spin_unlock_irqrestore(&plchan->lock, flags);
1562 case DMA_TERMINATE_ALL:
1563 plchan->state = PL08X_CHAN_IDLE;
1565 if (plchan->phychan) {
1566 pl08x_terminate_phy_chan(pl08x, plchan->phychan);
1569 * Mark physical channel as free and free any slave
1572 release_phy_channel(plchan);
1573 plchan->phychan_hold = 0;
1575 /* Dequeue jobs and free LLIs */
1577 /* Killing this one off, release its mux */
1578 pl08x_release_mux(plchan);
1579 pl08x_free_txd(pl08x, plchan->at);
1582 /* Dequeue jobs not yet fired as well */
1583 pl08x_free_txd_list(pl08x, plchan);
1586 pl08x_pause_phy_chan(plchan->phychan);
1587 plchan->state = PL08X_CHAN_PAUSED;
1590 pl08x_resume_phy_chan(plchan->phychan);
1591 plchan->state = PL08X_CHAN_RUNNING;
1594 /* Unknown command */
1599 spin_unlock_irqrestore(&plchan->lock, flags);
1604 bool pl08x_filter_id(struct dma_chan *chan, void *chan_id)
1606 struct pl08x_dma_chan *plchan;
1607 char *name = chan_id;
1609 /* Reject channels for devices not bound to this driver */
1610 if (chan->device->dev->driver != &pl08x_amba_driver.drv)
1613 plchan = to_pl08x_chan(chan);
1615 /* Check that the channel is not taken! */
1616 if (!strcmp(plchan->name, name))
1623 * Just check that the device is there and active
1624 * TODO: turn this bit on/off depending on the number of physical channels
1625 * actually used, if it is zero... well shut it off. That will save some
1626 * power. Cut the clock at the same time.
1628 static void pl08x_ensure_on(struct pl08x_driver_data *pl08x)
1630 /* The Nomadik variant does not have the config register */
1631 if (pl08x->vd->nomadik)
1633 writel(PL080_CONFIG_ENABLE, pl08x->base + PL080_CONFIG);
1636 static void pl08x_unmap_buffers(struct pl08x_txd *txd)
1638 struct device *dev = txd->tx.chan->device->dev;
1639 struct pl08x_sg *dsg;
1641 if (!(txd->tx.flags & DMA_COMPL_SKIP_SRC_UNMAP)) {
1642 if (txd->tx.flags & DMA_COMPL_SRC_UNMAP_SINGLE)
1643 list_for_each_entry(dsg, &txd->dsg_list, node)
1644 dma_unmap_single(dev, dsg->src_addr, dsg->len,
1647 list_for_each_entry(dsg, &txd->dsg_list, node)
1648 dma_unmap_page(dev, dsg->src_addr, dsg->len,
1652 if (!(txd->tx.flags & DMA_COMPL_SKIP_DEST_UNMAP)) {
1653 if (txd->tx.flags & DMA_COMPL_DEST_UNMAP_SINGLE)
1654 list_for_each_entry(dsg, &txd->dsg_list, node)
1655 dma_unmap_single(dev, dsg->dst_addr, dsg->len,
1658 list_for_each_entry(dsg, &txd->dsg_list, node)
1659 dma_unmap_page(dev, dsg->dst_addr, dsg->len,
1664 static void pl08x_tasklet(unsigned long data)
1666 struct pl08x_dma_chan *plchan = (struct pl08x_dma_chan *) data;
1667 struct pl08x_driver_data *pl08x = plchan->host;
1668 unsigned long flags;
1671 spin_lock_irqsave(&plchan->lock, flags);
1672 list_splice_tail_init(&plchan->done_list, &head);
1674 if (plchan->at || !list_empty(&plchan->pend_list) || plchan->phychan_hold) {
1676 * This channel is still in use - we have a new txd being
1677 * prepared and will soon be queued. Don't give up the
1681 struct pl08x_dma_chan *waiting = NULL;
1684 * No more jobs, so free up the physical channel
1686 release_phy_channel(plchan);
1687 plchan->state = PL08X_CHAN_IDLE;
1690 * And NOW before anyone else can grab that free:d up
1691 * physical channel, see if there is some memcpy pending
1692 * that seriously needs to start because of being stacked
1693 * up while we were choking the physical channels with data.
1695 list_for_each_entry(waiting, &pl08x->memcpy.channels,
1697 if (waiting->state == PL08X_CHAN_WAITING) {
1700 /* This should REALLY not fail now */
1701 ret = prep_phy_channel(waiting);
1703 waiting->phychan_hold--;
1704 waiting->state = PL08X_CHAN_RUNNING;
1706 * Eww. We know this isn't going to deadlock
1707 * but lockdep probably doens't.
1709 spin_lock(&waiting->lock);
1710 pl08x_start_next_txd(waiting);
1711 spin_unlock(&waiting->lock);
1717 spin_unlock_irqrestore(&plchan->lock, flags);
1719 while (!list_empty(&head)) {
1720 struct pl08x_txd *txd = list_first_entry(&head,
1721 struct pl08x_txd, node);
1722 dma_async_tx_callback callback = txd->tx.callback;
1723 void *callback_param = txd->tx.callback_param;
1725 list_del(&txd->node);
1727 /* Don't try to unmap buffers on slave channels */
1729 pl08x_unmap_buffers(txd);
1731 /* Free the descriptor */
1732 spin_lock_irqsave(&plchan->lock, flags);
1733 pl08x_free_txd(pl08x, txd);
1734 spin_unlock_irqrestore(&plchan->lock, flags);
1736 /* Callback to signal completion */
1738 callback(callback_param);
1742 static irqreturn_t pl08x_irq(int irq, void *dev)
1744 struct pl08x_driver_data *pl08x = dev;
1745 u32 mask = 0, err, tc, i;
1747 /* check & clear - ERR & TC interrupts */
1748 err = readl(pl08x->base + PL080_ERR_STATUS);
1750 dev_err(&pl08x->adev->dev, "%s error interrupt, register value 0x%08x\n",
1752 writel(err, pl08x->base + PL080_ERR_CLEAR);
1754 tc = readl(pl08x->base + PL080_TC_STATUS);
1756 writel(tc, pl08x->base + PL080_TC_CLEAR);
1761 for (i = 0; i < pl08x->vd->channels; i++) {
1762 if (((1 << i) & err) || ((1 << i) & tc)) {
1763 /* Locate physical channel */
1764 struct pl08x_phy_chan *phychan = &pl08x->phy_chans[i];
1765 struct pl08x_dma_chan *plchan = phychan->serving;
1766 struct pl08x_txd *tx;
1769 dev_err(&pl08x->adev->dev,
1770 "%s Error TC interrupt on unused channel: 0x%08x\n",
1775 spin_lock(&plchan->lock);
1780 * This descriptor is done, release its mux
1783 pl08x_release_mux(plchan);
1784 dma_cookie_complete(&tx->tx);
1785 list_add_tail(&tx->node, &plchan->done_list);
1787 /* And start the next descriptor */
1788 if (!list_empty(&plchan->issued_list))
1789 pl08x_start_next_txd(plchan);
1791 spin_unlock(&plchan->lock);
1793 /* Schedule tasklet on this channel */
1794 tasklet_schedule(&plchan->tasklet);
1799 return mask ? IRQ_HANDLED : IRQ_NONE;
1802 static void pl08x_dma_slave_init(struct pl08x_dma_chan *chan)
1805 chan->name = chan->cd->bus_id;
1806 chan->cfg.src_addr = chan->cd->addr;
1807 chan->cfg.dst_addr = chan->cd->addr;
1811 * Initialise the DMAC memcpy/slave channels.
1812 * Make a local wrapper to hold required data
1814 static int pl08x_dma_init_virtual_channels(struct pl08x_driver_data *pl08x,
1815 struct dma_device *dmadev, unsigned int channels, bool slave)
1817 struct pl08x_dma_chan *chan;
1820 INIT_LIST_HEAD(&dmadev->channels);
1823 * Register as many many memcpy as we have physical channels,
1824 * we won't always be able to use all but the code will have
1825 * to cope with that situation.
1827 for (i = 0; i < channels; i++) {
1828 chan = kzalloc(sizeof(*chan), GFP_KERNEL);
1830 dev_err(&pl08x->adev->dev,
1831 "%s no memory for channel\n", __func__);
1836 chan->state = PL08X_CHAN_IDLE;
1840 chan->cd = &pl08x->pd->slave_channels[i];
1841 pl08x_dma_slave_init(chan);
1843 chan->cd = &pl08x->pd->memcpy_channel;
1844 chan->name = kasprintf(GFP_KERNEL, "memcpy%d", i);
1850 dev_dbg(&pl08x->adev->dev,
1851 "initialize virtual channel \"%s\"\n",
1854 chan->chan.device = dmadev;
1855 dma_cookie_init(&chan->chan);
1857 spin_lock_init(&chan->lock);
1858 INIT_LIST_HEAD(&chan->pend_list);
1859 INIT_LIST_HEAD(&chan->issued_list);
1860 INIT_LIST_HEAD(&chan->done_list);
1861 tasklet_init(&chan->tasklet, pl08x_tasklet,
1862 (unsigned long) chan);
1864 list_add_tail(&chan->chan.device_node, &dmadev->channels);
1866 dev_info(&pl08x->adev->dev, "initialized %d virtual %s channels\n",
1867 i, slave ? "slave" : "memcpy");
1871 static void pl08x_free_virtual_channels(struct dma_device *dmadev)
1873 struct pl08x_dma_chan *chan = NULL;
1874 struct pl08x_dma_chan *next;
1876 list_for_each_entry_safe(chan,
1877 next, &dmadev->channels, chan.device_node) {
1878 list_del(&chan->chan.device_node);
1883 #ifdef CONFIG_DEBUG_FS
1884 static const char *pl08x_state_str(enum pl08x_dma_chan_state state)
1887 case PL08X_CHAN_IDLE:
1889 case PL08X_CHAN_RUNNING:
1891 case PL08X_CHAN_PAUSED:
1893 case PL08X_CHAN_WAITING:
1898 return "UNKNOWN STATE";
1901 static int pl08x_debugfs_show(struct seq_file *s, void *data)
1903 struct pl08x_driver_data *pl08x = s->private;
1904 struct pl08x_dma_chan *chan;
1905 struct pl08x_phy_chan *ch;
1906 unsigned long flags;
1909 seq_printf(s, "PL08x physical channels:\n");
1910 seq_printf(s, "CHANNEL:\tUSER:\n");
1911 seq_printf(s, "--------\t-----\n");
1912 for (i = 0; i < pl08x->vd->channels; i++) {
1913 struct pl08x_dma_chan *virt_chan;
1915 ch = &pl08x->phy_chans[i];
1917 spin_lock_irqsave(&ch->lock, flags);
1918 virt_chan = ch->serving;
1920 seq_printf(s, "%d\t\t%s%s\n",
1922 virt_chan ? virt_chan->name : "(none)",
1923 ch->locked ? " LOCKED" : "");
1925 spin_unlock_irqrestore(&ch->lock, flags);
1928 seq_printf(s, "\nPL08x virtual memcpy channels:\n");
1929 seq_printf(s, "CHANNEL:\tSTATE:\n");
1930 seq_printf(s, "--------\t------\n");
1931 list_for_each_entry(chan, &pl08x->memcpy.channels, chan.device_node) {
1932 seq_printf(s, "%s\t\t%s\n", chan->name,
1933 pl08x_state_str(chan->state));
1936 seq_printf(s, "\nPL08x virtual slave channels:\n");
1937 seq_printf(s, "CHANNEL:\tSTATE:\n");
1938 seq_printf(s, "--------\t------\n");
1939 list_for_each_entry(chan, &pl08x->slave.channels, chan.device_node) {
1940 seq_printf(s, "%s\t\t%s\n", chan->name,
1941 pl08x_state_str(chan->state));
1947 static int pl08x_debugfs_open(struct inode *inode, struct file *file)
1949 return single_open(file, pl08x_debugfs_show, inode->i_private);
1952 static const struct file_operations pl08x_debugfs_operations = {
1953 .open = pl08x_debugfs_open,
1955 .llseek = seq_lseek,
1956 .release = single_release,
1959 static void init_pl08x_debugfs(struct pl08x_driver_data *pl08x)
1961 /* Expose a simple debugfs interface to view all clocks */
1962 (void) debugfs_create_file(dev_name(&pl08x->adev->dev),
1963 S_IFREG | S_IRUGO, NULL, pl08x,
1964 &pl08x_debugfs_operations);
1968 static inline void init_pl08x_debugfs(struct pl08x_driver_data *pl08x)
1973 static int pl08x_probe(struct amba_device *adev, const struct amba_id *id)
1975 struct pl08x_driver_data *pl08x;
1976 const struct vendor_data *vd = id->data;
1980 ret = amba_request_regions(adev, NULL);
1984 /* Create the driver state holder */
1985 pl08x = kzalloc(sizeof(*pl08x), GFP_KERNEL);
1991 /* Initialize memcpy engine */
1992 dma_cap_set(DMA_MEMCPY, pl08x->memcpy.cap_mask);
1993 pl08x->memcpy.dev = &adev->dev;
1994 pl08x->memcpy.device_alloc_chan_resources = pl08x_alloc_chan_resources;
1995 pl08x->memcpy.device_free_chan_resources = pl08x_free_chan_resources;
1996 pl08x->memcpy.device_prep_dma_memcpy = pl08x_prep_dma_memcpy;
1997 pl08x->memcpy.device_prep_dma_interrupt = pl08x_prep_dma_interrupt;
1998 pl08x->memcpy.device_tx_status = pl08x_dma_tx_status;
1999 pl08x->memcpy.device_issue_pending = pl08x_issue_pending;
2000 pl08x->memcpy.device_control = pl08x_control;
2002 /* Initialize slave engine */
2003 dma_cap_set(DMA_SLAVE, pl08x->slave.cap_mask);
2004 pl08x->slave.dev = &adev->dev;
2005 pl08x->slave.device_alloc_chan_resources = pl08x_alloc_chan_resources;
2006 pl08x->slave.device_free_chan_resources = pl08x_free_chan_resources;
2007 pl08x->slave.device_prep_dma_interrupt = pl08x_prep_dma_interrupt;
2008 pl08x->slave.device_tx_status = pl08x_dma_tx_status;
2009 pl08x->slave.device_issue_pending = pl08x_issue_pending;
2010 pl08x->slave.device_prep_slave_sg = pl08x_prep_slave_sg;
2011 pl08x->slave.device_control = pl08x_control;
2013 /* Get the platform data */
2014 pl08x->pd = dev_get_platdata(&adev->dev);
2016 dev_err(&adev->dev, "no platform data supplied\n");
2017 goto out_no_platdata;
2020 /* Assign useful pointers to the driver state */
2024 /* By default, AHB1 only. If dualmaster, from platform */
2025 pl08x->lli_buses = PL08X_AHB1;
2026 pl08x->mem_buses = PL08X_AHB1;
2027 if (pl08x->vd->dualmaster) {
2028 pl08x->lli_buses = pl08x->pd->lli_buses;
2029 pl08x->mem_buses = pl08x->pd->mem_buses;
2032 /* A DMA memory pool for LLIs, align on 1-byte boundary */
2033 pl08x->pool = dma_pool_create(DRIVER_NAME, &pl08x->adev->dev,
2034 PL08X_LLI_TSFR_SIZE, PL08X_ALIGN, 0);
2037 goto out_no_lli_pool;
2040 pl08x->base = ioremap(adev->res.start, resource_size(&adev->res));
2043 goto out_no_ioremap;
2046 /* Turn on the PL08x */
2047 pl08x_ensure_on(pl08x);
2049 /* Attach the interrupt handler */
2050 writel(0x000000FF, pl08x->base + PL080_ERR_CLEAR);
2051 writel(0x000000FF, pl08x->base + PL080_TC_CLEAR);
2053 ret = request_irq(adev->irq[0], pl08x_irq, IRQF_DISABLED,
2054 DRIVER_NAME, pl08x);
2056 dev_err(&adev->dev, "%s failed to request interrupt %d\n",
2057 __func__, adev->irq[0]);
2061 /* Initialize physical channels */
2062 pl08x->phy_chans = kzalloc((vd->channels * sizeof(*pl08x->phy_chans)),
2064 if (!pl08x->phy_chans) {
2065 dev_err(&adev->dev, "%s failed to allocate "
2066 "physical channel holders\n",
2068 goto out_no_phychans;
2071 for (i = 0; i < vd->channels; i++) {
2072 struct pl08x_phy_chan *ch = &pl08x->phy_chans[i];
2075 ch->base = pl08x->base + PL080_Cx_BASE(i);
2076 spin_lock_init(&ch->lock);
2079 * Nomadik variants can have channels that are locked
2080 * down for the secure world only. Lock up these channels
2081 * by perpetually serving a dummy virtual channel.
2086 val = readl(ch->base + PL080_CH_CONFIG);
2087 if (val & (PL080N_CONFIG_ITPROT | PL080N_CONFIG_SECPROT)) {
2088 dev_info(&adev->dev, "physical channel %d reserved for secure access only\n", i);
2093 dev_dbg(&adev->dev, "physical channel %d is %s\n",
2094 i, pl08x_phy_channel_busy(ch) ? "BUSY" : "FREE");
2097 /* Register as many memcpy channels as there are physical channels */
2098 ret = pl08x_dma_init_virtual_channels(pl08x, &pl08x->memcpy,
2099 pl08x->vd->channels, false);
2101 dev_warn(&pl08x->adev->dev,
2102 "%s failed to enumerate memcpy channels - %d\n",
2106 pl08x->memcpy.chancnt = ret;
2108 /* Register slave channels */
2109 ret = pl08x_dma_init_virtual_channels(pl08x, &pl08x->slave,
2110 pl08x->pd->num_slave_channels, true);
2112 dev_warn(&pl08x->adev->dev,
2113 "%s failed to enumerate slave channels - %d\n",
2117 pl08x->slave.chancnt = ret;
2119 ret = dma_async_device_register(&pl08x->memcpy);
2121 dev_warn(&pl08x->adev->dev,
2122 "%s failed to register memcpy as an async device - %d\n",
2124 goto out_no_memcpy_reg;
2127 ret = dma_async_device_register(&pl08x->slave);
2129 dev_warn(&pl08x->adev->dev,
2130 "%s failed to register slave as an async device - %d\n",
2132 goto out_no_slave_reg;
2135 amba_set_drvdata(adev, pl08x);
2136 init_pl08x_debugfs(pl08x);
2137 dev_info(&pl08x->adev->dev, "DMA: PL%03x rev%u at 0x%08llx irq %d\n",
2138 amba_part(adev), amba_rev(adev),
2139 (unsigned long long)adev->res.start, adev->irq[0]);
2144 dma_async_device_unregister(&pl08x->memcpy);
2146 pl08x_free_virtual_channels(&pl08x->slave);
2148 pl08x_free_virtual_channels(&pl08x->memcpy);
2150 kfree(pl08x->phy_chans);
2152 free_irq(adev->irq[0], pl08x);
2154 iounmap(pl08x->base);
2156 dma_pool_destroy(pl08x->pool);
2161 amba_release_regions(adev);
2165 /* PL080 has 8 channels and the PL080 have just 2 */
2166 static struct vendor_data vendor_pl080 = {
2171 static struct vendor_data vendor_nomadik = {
2177 static struct vendor_data vendor_pl081 = {
2179 .dualmaster = false,
2182 static struct amba_id pl08x_ids[] = {
2187 .data = &vendor_pl080,
2193 .data = &vendor_pl081,
2195 /* Nomadik 8815 PL080 variant */
2199 .data = &vendor_nomadik,
2204 MODULE_DEVICE_TABLE(amba, pl08x_ids);
2206 static struct amba_driver pl08x_amba_driver = {
2207 .drv.name = DRIVER_NAME,
2208 .id_table = pl08x_ids,
2209 .probe = pl08x_probe,
2212 static int __init pl08x_init(void)
2215 retval = amba_driver_register(&pl08x_amba_driver);
2217 printk(KERN_WARNING DRIVER_NAME
2218 "failed to register as an AMBA device (%d)\n",
2222 subsys_initcall(pl08x_init);