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/init.h>
80 #include <linux/interrupt.h>
81 #include <linux/module.h>
82 #include <linux/pm_runtime.h>
83 #include <linux/seq_file.h>
84 #include <linux/slab.h>
85 #include <asm/hardware/pl080.h>
87 #define DRIVER_NAME "pl08xdmac"
90 * struct vendor_data - vendor-specific config parameters for PL08x derivatives
91 * @channels: the number of channels available in this variant
92 * @dualmaster: whether this version supports dual AHB masters or not.
100 * PL08X private data structures
101 * An LLI struct - see PL08x TRM. Note that next uses bit[0] as a bus bit,
102 * start & end do not - their bus bit info is in cctl. Also note that these
103 * are fixed 32-bit quantities.
113 * struct pl08x_driver_data - the local state holder for the PL08x
114 * @slave: slave engine for this instance
115 * @memcpy: memcpy engine for this instance
116 * @base: virtual memory base (remapped) for the PL08x
117 * @adev: the corresponding AMBA (PrimeCell) bus entry
118 * @vd: vendor data for this PL08x variant
119 * @pd: platform data passed in from the platform/machine
120 * @phy_chans: array of data for the physical channels
121 * @pool: a pool for the LLI descriptors
122 * @pool_ctr: counter of LLIs in the pool
123 * @lli_buses: bitmask to or in to LLI pointer selecting AHB port for LLI
125 * @mem_buses: set to indicate memory transfers on AHB2.
126 * @lock: a spinlock for this struct
128 struct pl08x_driver_data {
129 struct dma_device slave;
130 struct dma_device memcpy;
132 struct amba_device *adev;
133 const struct vendor_data *vd;
134 struct pl08x_platform_data *pd;
135 struct pl08x_phy_chan *phy_chans;
136 struct dma_pool *pool;
144 * PL08X specific defines
147 /* Size (bytes) of each LLI buffer allocated for one transfer */
148 # define PL08X_LLI_TSFR_SIZE 0x2000
150 /* Maximum times we call dma_pool_alloc on this pool without freeing */
151 #define MAX_NUM_TSFR_LLIS (PL08X_LLI_TSFR_SIZE/sizeof(struct pl08x_lli))
152 #define PL08X_ALIGN 8
154 static inline struct pl08x_dma_chan *to_pl08x_chan(struct dma_chan *chan)
156 return container_of(chan, struct pl08x_dma_chan, chan);
159 static inline struct pl08x_txd *to_pl08x_txd(struct dma_async_tx_descriptor *tx)
161 return container_of(tx, struct pl08x_txd, tx);
165 * Physical channel handling
168 /* Whether a certain channel is busy or not */
169 static int pl08x_phy_channel_busy(struct pl08x_phy_chan *ch)
173 val = readl(ch->base + PL080_CH_CONFIG);
174 return val & PL080_CONFIG_ACTIVE;
178 * Set the initial DMA register values i.e. those for the first LLI
179 * The next LLI pointer and the configuration interrupt bit have
180 * been set when the LLIs were constructed. Poke them into the hardware
181 * and start the transfer.
183 static void pl08x_start_txd(struct pl08x_dma_chan *plchan,
184 struct pl08x_txd *txd)
186 struct pl08x_driver_data *pl08x = plchan->host;
187 struct pl08x_phy_chan *phychan = plchan->phychan;
188 struct pl08x_lli *lli = &txd->llis_va[0];
193 /* Wait for channel inactive */
194 while (pl08x_phy_channel_busy(phychan))
197 dev_vdbg(&pl08x->adev->dev,
198 "WRITE channel %d: csrc=0x%08x, cdst=0x%08x, "
199 "clli=0x%08x, cctl=0x%08x, ccfg=0x%08x\n",
200 phychan->id, lli->src, lli->dst, lli->lli, lli->cctl,
203 writel(lli->src, phychan->base + PL080_CH_SRC_ADDR);
204 writel(lli->dst, phychan->base + PL080_CH_DST_ADDR);
205 writel(lli->lli, phychan->base + PL080_CH_LLI);
206 writel(lli->cctl, phychan->base + PL080_CH_CONTROL);
207 writel(txd->ccfg, phychan->base + PL080_CH_CONFIG);
209 /* Enable the DMA channel */
210 /* Do not access config register until channel shows as disabled */
211 while (readl(pl08x->base + PL080_EN_CHAN) & (1 << phychan->id))
214 /* Do not access config register until channel shows as inactive */
215 val = readl(phychan->base + PL080_CH_CONFIG);
216 while ((val & PL080_CONFIG_ACTIVE) || (val & PL080_CONFIG_ENABLE))
217 val = readl(phychan->base + PL080_CH_CONFIG);
219 writel(val | PL080_CONFIG_ENABLE, phychan->base + PL080_CH_CONFIG);
223 * Pause the channel by setting the HALT bit.
225 * For M->P transfers, pause the DMAC first and then stop the peripheral -
226 * the FIFO can only drain if the peripheral is still requesting data.
227 * (note: this can still timeout if the DMAC FIFO never drains of data.)
229 * For P->M transfers, disable the peripheral first to stop it filling
230 * the DMAC FIFO, and then pause the DMAC.
232 static void pl08x_pause_phy_chan(struct pl08x_phy_chan *ch)
237 /* Set the HALT bit and wait for the FIFO to drain */
238 val = readl(ch->base + PL080_CH_CONFIG);
239 val |= PL080_CONFIG_HALT;
240 writel(val, ch->base + PL080_CH_CONFIG);
242 /* Wait for channel inactive */
243 for (timeout = 1000; timeout; timeout--) {
244 if (!pl08x_phy_channel_busy(ch))
248 if (pl08x_phy_channel_busy(ch))
249 pr_err("pl08x: channel%u timeout waiting for pause\n", ch->id);
252 static void pl08x_resume_phy_chan(struct pl08x_phy_chan *ch)
256 /* Clear the HALT bit */
257 val = readl(ch->base + PL080_CH_CONFIG);
258 val &= ~PL080_CONFIG_HALT;
259 writel(val, ch->base + PL080_CH_CONFIG);
263 * pl08x_terminate_phy_chan() stops the channel, clears the FIFO and
264 * clears any pending interrupt status. This should not be used for
265 * an on-going transfer, but as a method of shutting down a channel
266 * (eg, when it's no longer used) or terminating a transfer.
268 static void pl08x_terminate_phy_chan(struct pl08x_driver_data *pl08x,
269 struct pl08x_phy_chan *ch)
271 u32 val = readl(ch->base + PL080_CH_CONFIG);
273 val &= ~(PL080_CONFIG_ENABLE | PL080_CONFIG_ERR_IRQ_MASK |
274 PL080_CONFIG_TC_IRQ_MASK);
276 writel(val, ch->base + PL080_CH_CONFIG);
278 writel(1 << ch->id, pl08x->base + PL080_ERR_CLEAR);
279 writel(1 << ch->id, pl08x->base + PL080_TC_CLEAR);
282 static inline u32 get_bytes_in_cctl(u32 cctl)
284 /* The source width defines the number of bytes */
285 u32 bytes = cctl & PL080_CONTROL_TRANSFER_SIZE_MASK;
287 switch (cctl >> PL080_CONTROL_SWIDTH_SHIFT) {
288 case PL080_WIDTH_8BIT:
290 case PL080_WIDTH_16BIT:
293 case PL080_WIDTH_32BIT:
300 /* The channel should be paused when calling this */
301 static u32 pl08x_getbytes_chan(struct pl08x_dma_chan *plchan)
303 struct pl08x_phy_chan *ch;
304 struct pl08x_txd *txd;
308 spin_lock_irqsave(&plchan->lock, flags);
309 ch = plchan->phychan;
313 * Follow the LLIs to get the number of remaining
314 * bytes in the currently active transaction.
317 u32 clli = readl(ch->base + PL080_CH_LLI) & ~PL080_LLI_LM_AHB2;
319 /* First get the remaining bytes in the active transfer */
320 bytes = get_bytes_in_cctl(readl(ch->base + PL080_CH_CONTROL));
323 struct pl08x_lli *llis_va = txd->llis_va;
324 dma_addr_t llis_bus = txd->llis_bus;
327 BUG_ON(clli < llis_bus || clli >= llis_bus +
328 sizeof(struct pl08x_lli) * MAX_NUM_TSFR_LLIS);
331 * Locate the next LLI - as this is an array,
332 * it's simple maths to find.
334 index = (clli - llis_bus) / sizeof(struct pl08x_lli);
336 for (; index < MAX_NUM_TSFR_LLIS; index++) {
337 bytes += get_bytes_in_cctl(llis_va[index].cctl);
340 * A LLI pointer of 0 terminates the LLI list
342 if (!llis_va[index].lli)
348 /* Sum up all queued transactions */
349 if (!list_empty(&plchan->pend_list)) {
350 struct pl08x_txd *txdi;
351 list_for_each_entry(txdi, &plchan->pend_list, node) {
356 spin_unlock_irqrestore(&plchan->lock, flags);
362 * Allocate a physical channel for a virtual channel
364 * Try to locate a physical channel to be used for this transfer. If all
365 * are taken return NULL and the requester will have to cope by using
366 * some fallback PIO mode or retrying later.
368 static struct pl08x_phy_chan *
369 pl08x_get_phy_channel(struct pl08x_driver_data *pl08x,
370 struct pl08x_dma_chan *virt_chan)
372 struct pl08x_phy_chan *ch = NULL;
376 for (i = 0; i < pl08x->vd->channels; i++) {
377 ch = &pl08x->phy_chans[i];
379 spin_lock_irqsave(&ch->lock, flags);
382 ch->serving = virt_chan;
384 spin_unlock_irqrestore(&ch->lock, flags);
388 spin_unlock_irqrestore(&ch->lock, flags);
391 if (i == pl08x->vd->channels) {
392 /* No physical channel available, cope with it */
396 pm_runtime_get_sync(&pl08x->adev->dev);
400 static inline void pl08x_put_phy_channel(struct pl08x_driver_data *pl08x,
401 struct pl08x_phy_chan *ch)
405 spin_lock_irqsave(&ch->lock, flags);
407 /* Stop the channel and clear its interrupts */
408 pl08x_terminate_phy_chan(pl08x, ch);
410 pm_runtime_put(&pl08x->adev->dev);
412 /* Mark it as free */
414 spin_unlock_irqrestore(&ch->lock, flags);
421 static inline unsigned int pl08x_get_bytes_for_cctl(unsigned int coded)
424 case PL080_WIDTH_8BIT:
426 case PL080_WIDTH_16BIT:
428 case PL080_WIDTH_32BIT:
437 static inline u32 pl08x_cctl_bits(u32 cctl, u8 srcwidth, u8 dstwidth,
442 /* Remove all src, dst and transfer size bits */
443 retbits &= ~PL080_CONTROL_DWIDTH_MASK;
444 retbits &= ~PL080_CONTROL_SWIDTH_MASK;
445 retbits &= ~PL080_CONTROL_TRANSFER_SIZE_MASK;
447 /* Then set the bits according to the parameters */
450 retbits |= PL080_WIDTH_8BIT << PL080_CONTROL_SWIDTH_SHIFT;
453 retbits |= PL080_WIDTH_16BIT << PL080_CONTROL_SWIDTH_SHIFT;
456 retbits |= PL080_WIDTH_32BIT << PL080_CONTROL_SWIDTH_SHIFT;
465 retbits |= PL080_WIDTH_8BIT << PL080_CONTROL_DWIDTH_SHIFT;
468 retbits |= PL080_WIDTH_16BIT << PL080_CONTROL_DWIDTH_SHIFT;
471 retbits |= PL080_WIDTH_32BIT << PL080_CONTROL_DWIDTH_SHIFT;
478 retbits |= tsize << PL080_CONTROL_TRANSFER_SIZE_SHIFT;
482 struct pl08x_lli_build_data {
483 struct pl08x_txd *txd;
484 struct pl08x_bus_data srcbus;
485 struct pl08x_bus_data dstbus;
491 * Autoselect a master bus to use for the transfer. Slave will be the chosen as
492 * victim in case src & dest are not similarly aligned. i.e. If after aligning
493 * masters address with width requirements of transfer (by sending few byte by
494 * byte data), slave is still not aligned, then its width will be reduced to
496 * - prefers the destination bus if both available
497 * - prefers bus with fixed address (i.e. peripheral)
499 static void pl08x_choose_master_bus(struct pl08x_lli_build_data *bd,
500 struct pl08x_bus_data **mbus, struct pl08x_bus_data **sbus, u32 cctl)
502 if (!(cctl & PL080_CONTROL_DST_INCR)) {
505 } else if (!(cctl & PL080_CONTROL_SRC_INCR)) {
509 if (bd->dstbus.buswidth >= bd->srcbus.buswidth) {
520 * Fills in one LLI for a certain transfer descriptor and advance the counter
522 static void pl08x_fill_lli_for_desc(struct pl08x_lli_build_data *bd,
523 int num_llis, int len, u32 cctl)
525 struct pl08x_lli *llis_va = bd->txd->llis_va;
526 dma_addr_t llis_bus = bd->txd->llis_bus;
528 BUG_ON(num_llis >= MAX_NUM_TSFR_LLIS);
530 llis_va[num_llis].cctl = cctl;
531 llis_va[num_llis].src = bd->srcbus.addr;
532 llis_va[num_llis].dst = bd->dstbus.addr;
533 llis_va[num_llis].lli = llis_bus + (num_llis + 1) *
534 sizeof(struct pl08x_lli);
535 llis_va[num_llis].lli |= bd->lli_bus;
537 if (cctl & PL080_CONTROL_SRC_INCR)
538 bd->srcbus.addr += len;
539 if (cctl & PL080_CONTROL_DST_INCR)
540 bd->dstbus.addr += len;
542 BUG_ON(bd->remainder < len);
544 bd->remainder -= len;
547 static inline void prep_byte_width_lli(struct pl08x_lli_build_data *bd,
548 u32 *cctl, u32 len, int num_llis, size_t *total_bytes)
550 *cctl = pl08x_cctl_bits(*cctl, 1, 1, len);
551 pl08x_fill_lli_for_desc(bd, num_llis, len, *cctl);
552 (*total_bytes) += len;
556 * This fills in the table of LLIs for the transfer descriptor
557 * Note that we assume we never have to change the burst sizes
560 static int pl08x_fill_llis_for_desc(struct pl08x_driver_data *pl08x,
561 struct pl08x_txd *txd)
563 struct pl08x_bus_data *mbus, *sbus;
564 struct pl08x_lli_build_data bd;
566 u32 cctl, early_bytes = 0;
567 size_t max_bytes_per_lli, total_bytes = 0;
568 struct pl08x_lli *llis_va;
570 txd->llis_va = dma_pool_alloc(pl08x->pool, GFP_NOWAIT, &txd->llis_bus);
572 dev_err(&pl08x->adev->dev, "%s no memory for llis\n", __func__);
578 /* Get the default CCTL */
582 bd.srcbus.addr = txd->src_addr;
583 bd.dstbus.addr = txd->dst_addr;
584 bd.lli_bus = (pl08x->lli_buses & PL08X_AHB2) ? PL080_LLI_LM_AHB2 : 0;
586 /* Find maximum width of the source bus */
588 pl08x_get_bytes_for_cctl((cctl & PL080_CONTROL_SWIDTH_MASK) >>
589 PL080_CONTROL_SWIDTH_SHIFT);
591 /* Find maximum width of the destination bus */
593 pl08x_get_bytes_for_cctl((cctl & PL080_CONTROL_DWIDTH_MASK) >>
594 PL080_CONTROL_DWIDTH_SHIFT);
596 /* Set up the bus widths to the maximum */
597 bd.srcbus.buswidth = bd.srcbus.maxwidth;
598 bd.dstbus.buswidth = bd.dstbus.maxwidth;
600 /* We need to count this down to zero */
601 bd.remainder = txd->len;
603 pl08x_choose_master_bus(&bd, &mbus, &sbus, cctl);
605 dev_vdbg(&pl08x->adev->dev, "src=0x%08x%s/%u dst=0x%08x%s/%u len=%zu\n",
606 bd.srcbus.addr, cctl & PL080_CONTROL_SRC_INCR ? "+" : "",
608 bd.dstbus.addr, cctl & PL080_CONTROL_DST_INCR ? "+" : "",
611 dev_vdbg(&pl08x->adev->dev, "mbus=%s sbus=%s\n",
612 mbus == &bd.srcbus ? "src" : "dst",
613 sbus == &bd.srcbus ? "src" : "dst");
616 * Zero length is only allowed if all these requirements are met:
617 * - flow controller is peripheral.
618 * - src.addr is aligned to src.width
619 * - dst.addr is aligned to dst.width
621 * sg_len == 1 should be true, as there can be two cases here:
622 * - Memory addresses are contiguous and are not scattered. Here, Only
623 * one sg will be passed by user driver, with memory address and zero
624 * length. We pass this to controller and after the transfer it will
625 * receive the last burst request from peripheral and so transfer
628 * - Memory addresses are scattered and are not contiguous. Here,
629 * Obviously as DMA controller doesn't know when a lli's transfer gets
630 * over, it can't load next lli. So in this case, there has to be an
631 * assumption that only one lli is supported. Thus, we can't have
632 * scattered addresses.
635 u32 fc = (txd->ccfg & PL080_CONFIG_FLOW_CONTROL_MASK) >>
636 PL080_CONFIG_FLOW_CONTROL_SHIFT;
637 if (!((fc >= PL080_FLOW_SRC2DST_DST) &&
638 (fc <= PL080_FLOW_SRC2DST_SRC))) {
639 dev_err(&pl08x->adev->dev, "%s sg len can't be zero",
644 if ((bd.srcbus.addr % bd.srcbus.buswidth) ||
645 (bd.srcbus.addr % bd.srcbus.buswidth)) {
646 dev_err(&pl08x->adev->dev,
647 "%s src & dst address must be aligned to src"
648 " & dst width if peripheral is flow controller",
653 cctl = pl08x_cctl_bits(cctl, bd.srcbus.buswidth,
654 bd.dstbus.buswidth, 0);
655 pl08x_fill_lli_for_desc(&bd, num_llis++, 0, cctl);
659 * Send byte by byte for following cases
660 * - Less than a bus width available
661 * - until master bus is aligned
663 if (bd.remainder < mbus->buswidth)
664 early_bytes = bd.remainder;
665 else if ((mbus->addr) % (mbus->buswidth)) {
666 early_bytes = mbus->buswidth - (mbus->addr) % (mbus->buswidth);
667 if ((bd.remainder - early_bytes) < mbus->buswidth)
668 early_bytes = bd.remainder;
672 dev_vdbg(&pl08x->adev->dev, "%s byte width LLIs "
673 "(remain 0x%08x)\n", __func__, bd.remainder);
674 prep_byte_width_lli(&bd, &cctl, early_bytes, num_llis++,
681 * - if slave is not then we must set its width down
683 if (sbus->addr % sbus->buswidth) {
684 dev_dbg(&pl08x->adev->dev,
685 "%s set down bus width to one byte\n",
691 /* Bytes transferred = tsize * src width, not MIN(buswidths) */
692 max_bytes_per_lli = bd.srcbus.buswidth *
693 PL080_CONTROL_TRANSFER_SIZE_MASK;
696 * Make largest possible LLIs until less than one bus
699 while (bd.remainder > (mbus->buswidth - 1)) {
700 size_t lli_len, tsize, width;
703 * If enough left try to send max possible,
704 * otherwise try to send the remainder
706 lli_len = min(bd.remainder, max_bytes_per_lli);
709 * Check against maximum bus alignment: Calculate actual
710 * transfer size in relation to bus width and get a
711 * maximum remainder of the highest bus width - 1
713 width = max(mbus->buswidth, sbus->buswidth);
714 lli_len = (lli_len / width) * width;
715 tsize = lli_len / bd.srcbus.buswidth;
717 dev_vdbg(&pl08x->adev->dev,
718 "%s fill lli with single lli chunk of "
719 "size 0x%08zx (remainder 0x%08zx)\n",
720 __func__, lli_len, bd.remainder);
722 cctl = pl08x_cctl_bits(cctl, bd.srcbus.buswidth,
723 bd.dstbus.buswidth, tsize);
724 pl08x_fill_lli_for_desc(&bd, num_llis++, lli_len, cctl);
725 total_bytes += lli_len;
732 dev_vdbg(&pl08x->adev->dev,
733 "%s align with boundary, send odd bytes (remain %zu)\n",
734 __func__, bd.remainder);
735 prep_byte_width_lli(&bd, &cctl, bd.remainder,
736 num_llis++, &total_bytes);
740 if (total_bytes != txd->len) {
741 dev_err(&pl08x->adev->dev,
742 "%s size of encoded lli:s don't match total txd, transferred 0x%08zx from size 0x%08zx\n",
743 __func__, total_bytes, txd->len);
747 if (num_llis >= MAX_NUM_TSFR_LLIS) {
748 dev_err(&pl08x->adev->dev,
749 "%s need to increase MAX_NUM_TSFR_LLIS from 0x%08x\n",
750 __func__, (u32) MAX_NUM_TSFR_LLIS);
754 llis_va = txd->llis_va;
755 /* The final LLI terminates the LLI. */
756 llis_va[num_llis - 1].lli = 0;
757 /* The final LLI element shall also fire an interrupt. */
758 llis_va[num_llis - 1].cctl |= PL080_CONTROL_TC_IRQ_EN;
764 dev_vdbg(&pl08x->adev->dev,
765 "%-3s %-9s %-10s %-10s %-10s %s\n",
766 "lli", "", "csrc", "cdst", "clli", "cctl");
767 for (i = 0; i < num_llis; i++) {
768 dev_vdbg(&pl08x->adev->dev,
769 "%3d @%p: 0x%08x 0x%08x 0x%08x 0x%08x\n",
770 i, &llis_va[i], llis_va[i].src,
771 llis_va[i].dst, llis_va[i].lli, llis_va[i].cctl
780 /* You should call this with the struct pl08x lock held */
781 static void pl08x_free_txd(struct pl08x_driver_data *pl08x,
782 struct pl08x_txd *txd)
785 dma_pool_free(pl08x->pool, txd->llis_va, txd->llis_bus);
792 static void pl08x_free_txd_list(struct pl08x_driver_data *pl08x,
793 struct pl08x_dma_chan *plchan)
795 struct pl08x_txd *txdi = NULL;
796 struct pl08x_txd *next;
798 if (!list_empty(&plchan->pend_list)) {
799 list_for_each_entry_safe(txdi,
800 next, &plchan->pend_list, node) {
801 list_del(&txdi->node);
802 pl08x_free_txd(pl08x, txdi);
810 static int pl08x_alloc_chan_resources(struct dma_chan *chan)
815 static void pl08x_free_chan_resources(struct dma_chan *chan)
820 * This should be called with the channel plchan->lock held
822 static int prep_phy_channel(struct pl08x_dma_chan *plchan,
823 struct pl08x_txd *txd)
825 struct pl08x_driver_data *pl08x = plchan->host;
826 struct pl08x_phy_chan *ch;
829 /* Check if we already have a channel */
833 ch = pl08x_get_phy_channel(pl08x, plchan);
835 /* No physical channel available, cope with it */
836 dev_dbg(&pl08x->adev->dev, "no physical channel available for xfer on %s\n", plchan->name);
841 * OK we have a physical channel: for memcpy() this is all we
842 * need, but for slaves the physical signals may be muxed!
843 * Can the platform allow us to use this channel?
845 if (plchan->slave && pl08x->pd->get_signal) {
846 ret = pl08x->pd->get_signal(plchan);
848 dev_dbg(&pl08x->adev->dev,
849 "unable to use physical channel %d for transfer on %s due to platform restrictions\n",
850 ch->id, plchan->name);
851 /* Release physical channel & return */
852 pl08x_put_phy_channel(pl08x, ch);
857 /* Assign the flow control signal to this channel */
858 if (txd->direction == DMA_TO_DEVICE)
859 txd->ccfg |= ch->signal << PL080_CONFIG_DST_SEL_SHIFT;
860 else if (txd->direction == DMA_FROM_DEVICE)
861 txd->ccfg |= ch->signal << PL080_CONFIG_SRC_SEL_SHIFT;
864 dev_dbg(&pl08x->adev->dev, "allocated physical channel %d and signal %d for xfer on %s\n",
869 plchan->phychan_hold++;
870 plchan->phychan = ch;
875 static void release_phy_channel(struct pl08x_dma_chan *plchan)
877 struct pl08x_driver_data *pl08x = plchan->host;
879 if ((plchan->phychan->signal >= 0) && pl08x->pd->put_signal) {
880 pl08x->pd->put_signal(plchan);
881 plchan->phychan->signal = -1;
883 pl08x_put_phy_channel(pl08x, plchan->phychan);
884 plchan->phychan = NULL;
887 static dma_cookie_t pl08x_tx_submit(struct dma_async_tx_descriptor *tx)
889 struct pl08x_dma_chan *plchan = to_pl08x_chan(tx->chan);
890 struct pl08x_txd *txd = to_pl08x_txd(tx);
893 spin_lock_irqsave(&plchan->lock, flags);
895 plchan->chan.cookie += 1;
896 if (plchan->chan.cookie < 0)
897 plchan->chan.cookie = 1;
898 tx->cookie = plchan->chan.cookie;
900 /* Put this onto the pending list */
901 list_add_tail(&txd->node, &plchan->pend_list);
904 * If there was no physical channel available for this memcpy,
905 * stack the request up and indicate that the channel is waiting
906 * for a free physical channel.
908 if (!plchan->slave && !plchan->phychan) {
909 /* Do this memcpy whenever there is a channel ready */
910 plchan->state = PL08X_CHAN_WAITING;
911 plchan->waiting = txd;
913 plchan->phychan_hold--;
916 spin_unlock_irqrestore(&plchan->lock, flags);
921 static struct dma_async_tx_descriptor *pl08x_prep_dma_interrupt(
922 struct dma_chan *chan, unsigned long flags)
924 struct dma_async_tx_descriptor *retval = NULL;
930 * Code accessing dma_async_is_complete() in a tight loop may give problems.
931 * If slaves are relying on interrupts to signal completion this function
932 * must not be called with interrupts disabled.
934 static enum dma_status pl08x_dma_tx_status(struct dma_chan *chan,
935 dma_cookie_t cookie, struct dma_tx_state *txstate)
937 struct pl08x_dma_chan *plchan = to_pl08x_chan(chan);
938 dma_cookie_t last_used;
939 dma_cookie_t last_complete;
943 last_used = plchan->chan.cookie;
944 last_complete = plchan->lc;
946 ret = dma_async_is_complete(cookie, last_complete, last_used);
947 if (ret == DMA_SUCCESS) {
948 dma_set_tx_state(txstate, last_complete, last_used, 0);
953 * This cookie not complete yet
955 last_used = plchan->chan.cookie;
956 last_complete = plchan->lc;
958 /* Get number of bytes left in the active transactions and queue */
959 bytesleft = pl08x_getbytes_chan(plchan);
961 dma_set_tx_state(txstate, last_complete, last_used,
964 if (plchan->state == PL08X_CHAN_PAUSED)
967 /* Whether waiting or running, we're in progress */
968 return DMA_IN_PROGRESS;
971 /* PrimeCell DMA extension */
977 static const struct burst_table burst_sizes[] = {
980 .reg = PL080_BSIZE_256,
984 .reg = PL080_BSIZE_128,
988 .reg = PL080_BSIZE_64,
992 .reg = PL080_BSIZE_32,
996 .reg = PL080_BSIZE_16,
1000 .reg = PL080_BSIZE_8,
1004 .reg = PL080_BSIZE_4,
1008 .reg = PL080_BSIZE_1,
1013 * Given the source and destination available bus masks, select which
1014 * will be routed to each port. We try to have source and destination
1015 * on separate ports, but always respect the allowable settings.
1017 static u32 pl08x_select_bus(u8 src, u8 dst)
1021 if (!(dst & PL08X_AHB1) || ((dst & PL08X_AHB2) && (src & PL08X_AHB1)))
1022 cctl |= PL080_CONTROL_DST_AHB2;
1023 if (!(src & PL08X_AHB1) || ((src & PL08X_AHB2) && !(dst & PL08X_AHB2)))
1024 cctl |= PL080_CONTROL_SRC_AHB2;
1029 static u32 pl08x_cctl(u32 cctl)
1031 cctl &= ~(PL080_CONTROL_SRC_AHB2 | PL080_CONTROL_DST_AHB2 |
1032 PL080_CONTROL_SRC_INCR | PL080_CONTROL_DST_INCR |
1033 PL080_CONTROL_PROT_MASK);
1035 /* Access the cell in privileged mode, non-bufferable, non-cacheable */
1036 return cctl | PL080_CONTROL_PROT_SYS;
1039 static u32 pl08x_width(enum dma_slave_buswidth width)
1042 case DMA_SLAVE_BUSWIDTH_1_BYTE:
1043 return PL080_WIDTH_8BIT;
1044 case DMA_SLAVE_BUSWIDTH_2_BYTES:
1045 return PL080_WIDTH_16BIT;
1046 case DMA_SLAVE_BUSWIDTH_4_BYTES:
1047 return PL080_WIDTH_32BIT;
1053 static u32 pl08x_burst(u32 maxburst)
1057 for (i = 0; i < ARRAY_SIZE(burst_sizes); i++)
1058 if (burst_sizes[i].burstwords <= maxburst)
1061 return burst_sizes[i].reg;
1064 static int dma_set_runtime_config(struct dma_chan *chan,
1065 struct dma_slave_config *config)
1067 struct pl08x_dma_chan *plchan = to_pl08x_chan(chan);
1068 struct pl08x_driver_data *pl08x = plchan->host;
1069 enum dma_slave_buswidth addr_width;
1070 u32 width, burst, maxburst;
1076 /* Transfer direction */
1077 plchan->runtime_direction = config->direction;
1078 if (config->direction == DMA_TO_DEVICE) {
1079 addr_width = config->dst_addr_width;
1080 maxburst = config->dst_maxburst;
1081 } else if (config->direction == DMA_FROM_DEVICE) {
1082 addr_width = config->src_addr_width;
1083 maxburst = config->src_maxburst;
1085 dev_err(&pl08x->adev->dev,
1086 "bad runtime_config: alien transfer direction\n");
1090 width = pl08x_width(addr_width);
1092 dev_err(&pl08x->adev->dev,
1093 "bad runtime_config: alien address width\n");
1097 cctl |= width << PL080_CONTROL_SWIDTH_SHIFT;
1098 cctl |= width << PL080_CONTROL_DWIDTH_SHIFT;
1101 * If this channel will only request single transfers, set this
1102 * down to ONE element. Also select one element if no maxburst
1105 if (plchan->cd->single)
1108 burst = pl08x_burst(maxburst);
1109 cctl |= burst << PL080_CONTROL_SB_SIZE_SHIFT;
1110 cctl |= burst << PL080_CONTROL_DB_SIZE_SHIFT;
1112 if (plchan->runtime_direction == DMA_FROM_DEVICE) {
1113 plchan->src_addr = config->src_addr;
1114 plchan->src_cctl = pl08x_cctl(cctl) | PL080_CONTROL_DST_INCR |
1115 pl08x_select_bus(plchan->cd->periph_buses,
1118 plchan->dst_addr = config->dst_addr;
1119 plchan->dst_cctl = pl08x_cctl(cctl) | PL080_CONTROL_SRC_INCR |
1120 pl08x_select_bus(pl08x->mem_buses,
1121 plchan->cd->periph_buses);
1124 dev_dbg(&pl08x->adev->dev,
1125 "configured channel %s (%s) for %s, data width %d, "
1126 "maxburst %d words, LE, CCTL=0x%08x\n",
1127 dma_chan_name(chan), plchan->name,
1128 (config->direction == DMA_FROM_DEVICE) ? "RX" : "TX",
1137 * Slave transactions callback to the slave device to allow
1138 * synchronization of slave DMA signals with the DMAC enable
1140 static void pl08x_issue_pending(struct dma_chan *chan)
1142 struct pl08x_dma_chan *plchan = to_pl08x_chan(chan);
1143 unsigned long flags;
1145 spin_lock_irqsave(&plchan->lock, flags);
1146 /* Something is already active, or we're waiting for a channel... */
1147 if (plchan->at || plchan->state == PL08X_CHAN_WAITING) {
1148 spin_unlock_irqrestore(&plchan->lock, flags);
1152 /* Take the first element in the queue and execute it */
1153 if (!list_empty(&plchan->pend_list)) {
1154 struct pl08x_txd *next;
1156 next = list_first_entry(&plchan->pend_list,
1159 list_del(&next->node);
1160 plchan->state = PL08X_CHAN_RUNNING;
1162 pl08x_start_txd(plchan, next);
1165 spin_unlock_irqrestore(&plchan->lock, flags);
1168 static int pl08x_prep_channel_resources(struct pl08x_dma_chan *plchan,
1169 struct pl08x_txd *txd)
1171 struct pl08x_driver_data *pl08x = plchan->host;
1172 unsigned long flags;
1175 num_llis = pl08x_fill_llis_for_desc(pl08x, txd);
1181 spin_lock_irqsave(&plchan->lock, flags);
1184 * See if we already have a physical channel allocated,
1185 * else this is the time to try to get one.
1187 ret = prep_phy_channel(plchan, txd);
1190 * No physical channel was available.
1192 * memcpy transfers can be sorted out at submission time.
1194 * Slave transfers may have been denied due to platform
1195 * channel muxing restrictions. Since there is no guarantee
1196 * that this will ever be resolved, and the signal must be
1197 * acquired AFTER acquiring the physical channel, we will let
1198 * them be NACK:ed with -EBUSY here. The drivers can retry
1199 * the prep() call if they are eager on doing this using DMA.
1201 if (plchan->slave) {
1202 pl08x_free_txd_list(pl08x, plchan);
1203 pl08x_free_txd(pl08x, txd);
1204 spin_unlock_irqrestore(&plchan->lock, flags);
1209 * Else we're all set, paused and ready to roll, status
1210 * will switch to PL08X_CHAN_RUNNING when we call
1211 * issue_pending(). If there is something running on the
1212 * channel already we don't change its state.
1214 if (plchan->state == PL08X_CHAN_IDLE)
1215 plchan->state = PL08X_CHAN_PAUSED;
1217 spin_unlock_irqrestore(&plchan->lock, flags);
1222 static struct pl08x_txd *pl08x_get_txd(struct pl08x_dma_chan *plchan,
1223 unsigned long flags)
1225 struct pl08x_txd *txd = kzalloc(sizeof(*txd), GFP_NOWAIT);
1228 dma_async_tx_descriptor_init(&txd->tx, &plchan->chan);
1229 txd->tx.flags = flags;
1230 txd->tx.tx_submit = pl08x_tx_submit;
1231 INIT_LIST_HEAD(&txd->node);
1233 /* Always enable error and terminal interrupts */
1234 txd->ccfg = PL080_CONFIG_ERR_IRQ_MASK |
1235 PL080_CONFIG_TC_IRQ_MASK;
1241 * Initialize a descriptor to be used by memcpy submit
1243 static struct dma_async_tx_descriptor *pl08x_prep_dma_memcpy(
1244 struct dma_chan *chan, dma_addr_t dest, dma_addr_t src,
1245 size_t len, unsigned long flags)
1247 struct pl08x_dma_chan *plchan = to_pl08x_chan(chan);
1248 struct pl08x_driver_data *pl08x = plchan->host;
1249 struct pl08x_txd *txd;
1252 txd = pl08x_get_txd(plchan, flags);
1254 dev_err(&pl08x->adev->dev,
1255 "%s no memory for descriptor\n", __func__);
1259 txd->direction = DMA_NONE;
1260 txd->src_addr = src;
1261 txd->dst_addr = dest;
1264 /* Set platform data for m2m */
1265 txd->ccfg |= PL080_FLOW_MEM2MEM << PL080_CONFIG_FLOW_CONTROL_SHIFT;
1266 txd->cctl = pl08x->pd->memcpy_channel.cctl &
1267 ~(PL080_CONTROL_DST_AHB2 | PL080_CONTROL_SRC_AHB2);
1269 /* Both to be incremented or the code will break */
1270 txd->cctl |= PL080_CONTROL_SRC_INCR | PL080_CONTROL_DST_INCR;
1272 if (pl08x->vd->dualmaster)
1273 txd->cctl |= pl08x_select_bus(pl08x->mem_buses,
1276 ret = pl08x_prep_channel_resources(plchan, txd);
1283 static struct dma_async_tx_descriptor *pl08x_prep_slave_sg(
1284 struct dma_chan *chan, struct scatterlist *sgl,
1285 unsigned int sg_len, enum dma_data_direction direction,
1286 unsigned long flags)
1288 struct pl08x_dma_chan *plchan = to_pl08x_chan(chan);
1289 struct pl08x_driver_data *pl08x = plchan->host;
1290 struct pl08x_txd *txd;
1294 * Current implementation ASSUMES only one sg
1297 dev_err(&pl08x->adev->dev, "%s prepared too long sglist\n",
1302 dev_dbg(&pl08x->adev->dev, "%s prepare transaction of %d bytes from %s\n",
1303 __func__, sgl->length, plchan->name);
1305 txd = pl08x_get_txd(plchan, flags);
1307 dev_err(&pl08x->adev->dev, "%s no txd\n", __func__);
1311 if (direction != plchan->runtime_direction)
1312 dev_err(&pl08x->adev->dev, "%s DMA setup does not match "
1313 "the direction configured for the PrimeCell\n",
1317 * Set up addresses, the PrimeCell configured address
1318 * will take precedence since this may configure the
1319 * channel target address dynamically at runtime.
1321 txd->direction = direction;
1322 txd->len = sgl->length;
1324 if (direction == DMA_TO_DEVICE) {
1325 txd->cctl = plchan->dst_cctl;
1326 txd->src_addr = sgl->dma_address;
1327 txd->dst_addr = plchan->dst_addr;
1328 } else if (direction == DMA_FROM_DEVICE) {
1329 txd->cctl = plchan->src_cctl;
1330 txd->src_addr = plchan->src_addr;
1331 txd->dst_addr = sgl->dma_address;
1333 dev_err(&pl08x->adev->dev,
1334 "%s direction unsupported\n", __func__);
1338 if (plchan->cd->device_fc)
1339 tmp = (direction == DMA_TO_DEVICE) ? PL080_FLOW_MEM2PER_PER :
1340 PL080_FLOW_PER2MEM_PER;
1342 tmp = (direction == DMA_TO_DEVICE) ? PL080_FLOW_MEM2PER :
1345 txd->ccfg |= tmp << PL080_CONFIG_FLOW_CONTROL_SHIFT;
1347 ret = pl08x_prep_channel_resources(plchan, txd);
1354 static int pl08x_control(struct dma_chan *chan, enum dma_ctrl_cmd cmd,
1357 struct pl08x_dma_chan *plchan = to_pl08x_chan(chan);
1358 struct pl08x_driver_data *pl08x = plchan->host;
1359 unsigned long flags;
1362 /* Controls applicable to inactive channels */
1363 if (cmd == DMA_SLAVE_CONFIG) {
1364 return dma_set_runtime_config(chan,
1365 (struct dma_slave_config *)arg);
1369 * Anything succeeds on channels with no physical allocation and
1370 * no queued transfers.
1372 spin_lock_irqsave(&plchan->lock, flags);
1373 if (!plchan->phychan && !plchan->at) {
1374 spin_unlock_irqrestore(&plchan->lock, flags);
1379 case DMA_TERMINATE_ALL:
1380 plchan->state = PL08X_CHAN_IDLE;
1382 if (plchan->phychan) {
1383 pl08x_terminate_phy_chan(pl08x, plchan->phychan);
1386 * Mark physical channel as free and free any slave
1389 release_phy_channel(plchan);
1391 /* Dequeue jobs and free LLIs */
1393 pl08x_free_txd(pl08x, plchan->at);
1396 /* Dequeue jobs not yet fired as well */
1397 pl08x_free_txd_list(pl08x, plchan);
1400 pl08x_pause_phy_chan(plchan->phychan);
1401 plchan->state = PL08X_CHAN_PAUSED;
1404 pl08x_resume_phy_chan(plchan->phychan);
1405 plchan->state = PL08X_CHAN_RUNNING;
1408 /* Unknown command */
1413 spin_unlock_irqrestore(&plchan->lock, flags);
1418 bool pl08x_filter_id(struct dma_chan *chan, void *chan_id)
1420 struct pl08x_dma_chan *plchan = to_pl08x_chan(chan);
1421 char *name = chan_id;
1423 /* Check that the channel is not taken! */
1424 if (!strcmp(plchan->name, name))
1431 * Just check that the device is there and active
1432 * TODO: turn this bit on/off depending on the number of physical channels
1433 * actually used, if it is zero... well shut it off. That will save some
1434 * power. Cut the clock at the same time.
1436 static void pl08x_ensure_on(struct pl08x_driver_data *pl08x)
1438 writel(PL080_CONFIG_ENABLE, pl08x->base + PL080_CONFIG);
1441 static void pl08x_unmap_buffers(struct pl08x_txd *txd)
1443 struct device *dev = txd->tx.chan->device->dev;
1445 if (!(txd->tx.flags & DMA_COMPL_SKIP_SRC_UNMAP)) {
1446 if (txd->tx.flags & DMA_COMPL_SRC_UNMAP_SINGLE)
1447 dma_unmap_single(dev, txd->src_addr, txd->len,
1450 dma_unmap_page(dev, txd->src_addr, txd->len,
1453 if (!(txd->tx.flags & DMA_COMPL_SKIP_DEST_UNMAP)) {
1454 if (txd->tx.flags & DMA_COMPL_DEST_UNMAP_SINGLE)
1455 dma_unmap_single(dev, txd->dst_addr, txd->len,
1458 dma_unmap_page(dev, txd->dst_addr, txd->len,
1463 static void pl08x_tasklet(unsigned long data)
1465 struct pl08x_dma_chan *plchan = (struct pl08x_dma_chan *) data;
1466 struct pl08x_driver_data *pl08x = plchan->host;
1467 struct pl08x_txd *txd;
1468 unsigned long flags;
1470 spin_lock_irqsave(&plchan->lock, flags);
1476 /* Update last completed */
1477 plchan->lc = txd->tx.cookie;
1480 /* If a new descriptor is queued, set it up plchan->at is NULL here */
1481 if (!list_empty(&plchan->pend_list)) {
1482 struct pl08x_txd *next;
1484 next = list_first_entry(&plchan->pend_list,
1487 list_del(&next->node);
1489 pl08x_start_txd(plchan, next);
1490 } else if (plchan->phychan_hold) {
1492 * This channel is still in use - we have a new txd being
1493 * prepared and will soon be queued. Don't give up the
1497 struct pl08x_dma_chan *waiting = NULL;
1500 * No more jobs, so free up the physical channel
1501 * Free any allocated signal on slave transfers too
1503 release_phy_channel(plchan);
1504 plchan->state = PL08X_CHAN_IDLE;
1507 * And NOW before anyone else can grab that free:d up
1508 * physical channel, see if there is some memcpy pending
1509 * that seriously needs to start because of being stacked
1510 * up while we were choking the physical channels with data.
1512 list_for_each_entry(waiting, &pl08x->memcpy.channels,
1514 if (waiting->state == PL08X_CHAN_WAITING &&
1515 waiting->waiting != NULL) {
1518 /* This should REALLY not fail now */
1519 ret = prep_phy_channel(waiting,
1522 waiting->phychan_hold--;
1523 waiting->state = PL08X_CHAN_RUNNING;
1524 waiting->waiting = NULL;
1525 pl08x_issue_pending(&waiting->chan);
1531 spin_unlock_irqrestore(&plchan->lock, flags);
1534 dma_async_tx_callback callback = txd->tx.callback;
1535 void *callback_param = txd->tx.callback_param;
1537 /* Don't try to unmap buffers on slave channels */
1539 pl08x_unmap_buffers(txd);
1541 /* Free the descriptor */
1542 spin_lock_irqsave(&plchan->lock, flags);
1543 pl08x_free_txd(pl08x, txd);
1544 spin_unlock_irqrestore(&plchan->lock, flags);
1546 /* Callback to signal completion */
1548 callback(callback_param);
1552 static irqreturn_t pl08x_irq(int irq, void *dev)
1554 struct pl08x_driver_data *pl08x = dev;
1555 u32 mask = 0, err, tc, i;
1557 /* check & clear - ERR & TC interrupts */
1558 err = readl(pl08x->base + PL080_ERR_STATUS);
1560 dev_err(&pl08x->adev->dev, "%s error interrupt, register value 0x%08x\n",
1562 writel(err, pl08x->base + PL080_ERR_CLEAR);
1564 tc = readl(pl08x->base + PL080_INT_STATUS);
1566 writel(tc, pl08x->base + PL080_TC_CLEAR);
1571 for (i = 0; i < pl08x->vd->channels; i++) {
1572 if (((1 << i) & err) || ((1 << i) & tc)) {
1573 /* Locate physical channel */
1574 struct pl08x_phy_chan *phychan = &pl08x->phy_chans[i];
1575 struct pl08x_dma_chan *plchan = phychan->serving;
1578 dev_err(&pl08x->adev->dev,
1579 "%s Error TC interrupt on unused channel: 0x%08x\n",
1584 /* Schedule tasklet on this channel */
1585 tasklet_schedule(&plchan->tasklet);
1590 return mask ? IRQ_HANDLED : IRQ_NONE;
1593 static void pl08x_dma_slave_init(struct pl08x_dma_chan *chan)
1595 u32 cctl = pl08x_cctl(chan->cd->cctl);
1598 chan->name = chan->cd->bus_id;
1599 chan->src_addr = chan->cd->addr;
1600 chan->dst_addr = chan->cd->addr;
1601 chan->src_cctl = cctl | PL080_CONTROL_DST_INCR |
1602 pl08x_select_bus(chan->cd->periph_buses, chan->host->mem_buses);
1603 chan->dst_cctl = cctl | PL080_CONTROL_SRC_INCR |
1604 pl08x_select_bus(chan->host->mem_buses, chan->cd->periph_buses);
1608 * Initialise the DMAC memcpy/slave channels.
1609 * Make a local wrapper to hold required data
1611 static int pl08x_dma_init_virtual_channels(struct pl08x_driver_data *pl08x,
1612 struct dma_device *dmadev, unsigned int channels, bool slave)
1614 struct pl08x_dma_chan *chan;
1617 INIT_LIST_HEAD(&dmadev->channels);
1620 * Register as many many memcpy as we have physical channels,
1621 * we won't always be able to use all but the code will have
1622 * to cope with that situation.
1624 for (i = 0; i < channels; i++) {
1625 chan = kzalloc(sizeof(*chan), GFP_KERNEL);
1627 dev_err(&pl08x->adev->dev,
1628 "%s no memory for channel\n", __func__);
1633 chan->state = PL08X_CHAN_IDLE;
1636 chan->cd = &pl08x->pd->slave_channels[i];
1637 pl08x_dma_slave_init(chan);
1639 chan->cd = &pl08x->pd->memcpy_channel;
1640 chan->name = kasprintf(GFP_KERNEL, "memcpy%d", i);
1646 if (chan->cd->circular_buffer) {
1647 dev_err(&pl08x->adev->dev,
1648 "channel %s: circular buffers not supported\n",
1653 dev_dbg(&pl08x->adev->dev,
1654 "initialize virtual channel \"%s\"\n",
1657 chan->chan.device = dmadev;
1658 chan->chan.cookie = 0;
1661 spin_lock_init(&chan->lock);
1662 INIT_LIST_HEAD(&chan->pend_list);
1663 tasklet_init(&chan->tasklet, pl08x_tasklet,
1664 (unsigned long) chan);
1666 list_add_tail(&chan->chan.device_node, &dmadev->channels);
1668 dev_info(&pl08x->adev->dev, "initialized %d virtual %s channels\n",
1669 i, slave ? "slave" : "memcpy");
1673 static void pl08x_free_virtual_channels(struct dma_device *dmadev)
1675 struct pl08x_dma_chan *chan = NULL;
1676 struct pl08x_dma_chan *next;
1678 list_for_each_entry_safe(chan,
1679 next, &dmadev->channels, chan.device_node) {
1680 list_del(&chan->chan.device_node);
1685 #ifdef CONFIG_DEBUG_FS
1686 static const char *pl08x_state_str(enum pl08x_dma_chan_state state)
1689 case PL08X_CHAN_IDLE:
1691 case PL08X_CHAN_RUNNING:
1693 case PL08X_CHAN_PAUSED:
1695 case PL08X_CHAN_WAITING:
1700 return "UNKNOWN STATE";
1703 static int pl08x_debugfs_show(struct seq_file *s, void *data)
1705 struct pl08x_driver_data *pl08x = s->private;
1706 struct pl08x_dma_chan *chan;
1707 struct pl08x_phy_chan *ch;
1708 unsigned long flags;
1711 seq_printf(s, "PL08x physical channels:\n");
1712 seq_printf(s, "CHANNEL:\tUSER:\n");
1713 seq_printf(s, "--------\t-----\n");
1714 for (i = 0; i < pl08x->vd->channels; i++) {
1715 struct pl08x_dma_chan *virt_chan;
1717 ch = &pl08x->phy_chans[i];
1719 spin_lock_irqsave(&ch->lock, flags);
1720 virt_chan = ch->serving;
1722 seq_printf(s, "%d\t\t%s\n",
1723 ch->id, virt_chan ? virt_chan->name : "(none)");
1725 spin_unlock_irqrestore(&ch->lock, flags);
1728 seq_printf(s, "\nPL08x virtual memcpy channels:\n");
1729 seq_printf(s, "CHANNEL:\tSTATE:\n");
1730 seq_printf(s, "--------\t------\n");
1731 list_for_each_entry(chan, &pl08x->memcpy.channels, chan.device_node) {
1732 seq_printf(s, "%s\t\t%s\n", chan->name,
1733 pl08x_state_str(chan->state));
1736 seq_printf(s, "\nPL08x virtual slave channels:\n");
1737 seq_printf(s, "CHANNEL:\tSTATE:\n");
1738 seq_printf(s, "--------\t------\n");
1739 list_for_each_entry(chan, &pl08x->slave.channels, chan.device_node) {
1740 seq_printf(s, "%s\t\t%s\n", chan->name,
1741 pl08x_state_str(chan->state));
1747 static int pl08x_debugfs_open(struct inode *inode, struct file *file)
1749 return single_open(file, pl08x_debugfs_show, inode->i_private);
1752 static const struct file_operations pl08x_debugfs_operations = {
1753 .open = pl08x_debugfs_open,
1755 .llseek = seq_lseek,
1756 .release = single_release,
1759 static void init_pl08x_debugfs(struct pl08x_driver_data *pl08x)
1761 /* Expose a simple debugfs interface to view all clocks */
1762 (void) debugfs_create_file(dev_name(&pl08x->adev->dev),
1763 S_IFREG | S_IRUGO, NULL, pl08x,
1764 &pl08x_debugfs_operations);
1768 static inline void init_pl08x_debugfs(struct pl08x_driver_data *pl08x)
1773 static int pl08x_probe(struct amba_device *adev, const struct amba_id *id)
1775 struct pl08x_driver_data *pl08x;
1776 const struct vendor_data *vd = id->data;
1780 ret = amba_request_regions(adev, NULL);
1784 /* Create the driver state holder */
1785 pl08x = kzalloc(sizeof(*pl08x), GFP_KERNEL);
1791 pm_runtime_set_active(&adev->dev);
1792 pm_runtime_enable(&adev->dev);
1794 /* Initialize memcpy engine */
1795 dma_cap_set(DMA_MEMCPY, pl08x->memcpy.cap_mask);
1796 pl08x->memcpy.dev = &adev->dev;
1797 pl08x->memcpy.device_alloc_chan_resources = pl08x_alloc_chan_resources;
1798 pl08x->memcpy.device_free_chan_resources = pl08x_free_chan_resources;
1799 pl08x->memcpy.device_prep_dma_memcpy = pl08x_prep_dma_memcpy;
1800 pl08x->memcpy.device_prep_dma_interrupt = pl08x_prep_dma_interrupt;
1801 pl08x->memcpy.device_tx_status = pl08x_dma_tx_status;
1802 pl08x->memcpy.device_issue_pending = pl08x_issue_pending;
1803 pl08x->memcpy.device_control = pl08x_control;
1805 /* Initialize slave engine */
1806 dma_cap_set(DMA_SLAVE, pl08x->slave.cap_mask);
1807 pl08x->slave.dev = &adev->dev;
1808 pl08x->slave.device_alloc_chan_resources = pl08x_alloc_chan_resources;
1809 pl08x->slave.device_free_chan_resources = pl08x_free_chan_resources;
1810 pl08x->slave.device_prep_dma_interrupt = pl08x_prep_dma_interrupt;
1811 pl08x->slave.device_tx_status = pl08x_dma_tx_status;
1812 pl08x->slave.device_issue_pending = pl08x_issue_pending;
1813 pl08x->slave.device_prep_slave_sg = pl08x_prep_slave_sg;
1814 pl08x->slave.device_control = pl08x_control;
1816 /* Get the platform data */
1817 pl08x->pd = dev_get_platdata(&adev->dev);
1819 dev_err(&adev->dev, "no platform data supplied\n");
1820 goto out_no_platdata;
1823 /* Assign useful pointers to the driver state */
1827 /* By default, AHB1 only. If dualmaster, from platform */
1828 pl08x->lli_buses = PL08X_AHB1;
1829 pl08x->mem_buses = PL08X_AHB1;
1830 if (pl08x->vd->dualmaster) {
1831 pl08x->lli_buses = pl08x->pd->lli_buses;
1832 pl08x->mem_buses = pl08x->pd->mem_buses;
1835 /* A DMA memory pool for LLIs, align on 1-byte boundary */
1836 pl08x->pool = dma_pool_create(DRIVER_NAME, &pl08x->adev->dev,
1837 PL08X_LLI_TSFR_SIZE, PL08X_ALIGN, 0);
1840 goto out_no_lli_pool;
1843 spin_lock_init(&pl08x->lock);
1845 pl08x->base = ioremap(adev->res.start, resource_size(&adev->res));
1848 goto out_no_ioremap;
1851 /* Turn on the PL08x */
1852 pl08x_ensure_on(pl08x);
1854 /* Attach the interrupt handler */
1855 writel(0x000000FF, pl08x->base + PL080_ERR_CLEAR);
1856 writel(0x000000FF, pl08x->base + PL080_TC_CLEAR);
1858 ret = request_irq(adev->irq[0], pl08x_irq, IRQF_DISABLED,
1859 DRIVER_NAME, pl08x);
1861 dev_err(&adev->dev, "%s failed to request interrupt %d\n",
1862 __func__, adev->irq[0]);
1866 /* Initialize physical channels */
1867 pl08x->phy_chans = kmalloc((vd->channels * sizeof(*pl08x->phy_chans)),
1869 if (!pl08x->phy_chans) {
1870 dev_err(&adev->dev, "%s failed to allocate "
1871 "physical channel holders\n",
1873 goto out_no_phychans;
1876 for (i = 0; i < vd->channels; i++) {
1877 struct pl08x_phy_chan *ch = &pl08x->phy_chans[i];
1880 ch->base = pl08x->base + PL080_Cx_BASE(i);
1881 spin_lock_init(&ch->lock);
1884 dev_dbg(&adev->dev, "physical channel %d is %s\n",
1885 i, pl08x_phy_channel_busy(ch) ? "BUSY" : "FREE");
1888 /* Register as many memcpy channels as there are physical channels */
1889 ret = pl08x_dma_init_virtual_channels(pl08x, &pl08x->memcpy,
1890 pl08x->vd->channels, false);
1892 dev_warn(&pl08x->adev->dev,
1893 "%s failed to enumerate memcpy channels - %d\n",
1897 pl08x->memcpy.chancnt = ret;
1899 /* Register slave channels */
1900 ret = pl08x_dma_init_virtual_channels(pl08x, &pl08x->slave,
1901 pl08x->pd->num_slave_channels, true);
1903 dev_warn(&pl08x->adev->dev,
1904 "%s failed to enumerate slave channels - %d\n",
1908 pl08x->slave.chancnt = ret;
1910 ret = dma_async_device_register(&pl08x->memcpy);
1912 dev_warn(&pl08x->adev->dev,
1913 "%s failed to register memcpy as an async device - %d\n",
1915 goto out_no_memcpy_reg;
1918 ret = dma_async_device_register(&pl08x->slave);
1920 dev_warn(&pl08x->adev->dev,
1921 "%s failed to register slave as an async device - %d\n",
1923 goto out_no_slave_reg;
1926 amba_set_drvdata(adev, pl08x);
1927 init_pl08x_debugfs(pl08x);
1928 dev_info(&pl08x->adev->dev, "DMA: PL%03x rev%u at 0x%08llx irq %d\n",
1929 amba_part(adev), amba_rev(adev),
1930 (unsigned long long)adev->res.start, adev->irq[0]);
1932 pm_runtime_put(&adev->dev);
1936 dma_async_device_unregister(&pl08x->memcpy);
1938 pl08x_free_virtual_channels(&pl08x->slave);
1940 pl08x_free_virtual_channels(&pl08x->memcpy);
1942 kfree(pl08x->phy_chans);
1944 free_irq(adev->irq[0], pl08x);
1946 iounmap(pl08x->base);
1948 dma_pool_destroy(pl08x->pool);
1951 pm_runtime_put(&adev->dev);
1952 pm_runtime_disable(&adev->dev);
1956 amba_release_regions(adev);
1960 /* PL080 has 8 channels and the PL080 have just 2 */
1961 static struct vendor_data vendor_pl080 = {
1966 static struct vendor_data vendor_pl081 = {
1968 .dualmaster = false,
1971 static struct amba_id pl08x_ids[] = {
1976 .data = &vendor_pl080,
1982 .data = &vendor_pl081,
1984 /* Nomadik 8815 PL080 variant */
1988 .data = &vendor_pl080,
1993 static struct amba_driver pl08x_amba_driver = {
1994 .drv.name = DRIVER_NAME,
1995 .id_table = pl08x_ids,
1996 .probe = pl08x_probe,
1999 static int __init pl08x_init(void)
2002 retval = amba_driver_register(&pl08x_amba_driver);
2004 printk(KERN_WARNING DRIVER_NAME
2005 "failed to register as an AMBA device (%d)\n",
2009 subsys_initcall(pl08x_init);