2 * Copyright (C) 2013-2014 Allwinner Tech Co., Ltd
3 * Author: Sugar <shuge@allwinnertech.com>
5 * Copyright (C) 2014 Maxime Ripard
6 * Maxime Ripard <maxime.ripard@free-electrons.com>
8 * This program is free software; you can redistribute it and/or modify
9 * it under the terms of the GNU General Public License as published by
10 * the Free Software Foundation; either version 2 of the License, or
11 * (at your option) any later version.
14 #include <linux/clk.h>
15 #include <linux/delay.h>
16 #include <linux/dmaengine.h>
17 #include <linux/dmapool.h>
18 #include <linux/interrupt.h>
19 #include <linux/module.h>
20 #include <linux/of_dma.h>
21 #include <linux/platform_device.h>
22 #include <linux/reset.h>
23 #include <linux/slab.h>
24 #include <linux/types.h>
29 * There's 16 physical channels that can work in parallel.
31 * However we have 30 different endpoints for our requests.
33 * Since the channels are able to handle only an unidirectional
34 * transfer, we need to allocate more virtual channels so that
35 * everyone can grab one channel.
37 * Some devices can't work in both direction (mostly because it
38 * wouldn't make sense), so we have a bit fewer virtual channels than
39 * 2 channels per endpoints.
42 #define NR_MAX_CHANNELS 16
43 #define NR_MAX_REQUESTS 30
44 #define NR_MAX_VCHANS 53
49 #define DMA_IRQ_EN(x) ((x) * 0x04)
50 #define DMA_IRQ_HALF BIT(0)
51 #define DMA_IRQ_PKG BIT(1)
52 #define DMA_IRQ_QUEUE BIT(2)
54 #define DMA_IRQ_CHAN_NR 8
55 #define DMA_IRQ_CHAN_WIDTH 4
58 #define DMA_IRQ_STAT(x) ((x) * 0x04 + 0x10)
63 * Channels specific registers
65 #define DMA_CHAN_ENABLE 0x00
66 #define DMA_CHAN_ENABLE_START BIT(0)
67 #define DMA_CHAN_ENABLE_STOP 0
69 #define DMA_CHAN_PAUSE 0x04
70 #define DMA_CHAN_PAUSE_PAUSE BIT(1)
71 #define DMA_CHAN_PAUSE_RESUME 0
73 #define DMA_CHAN_LLI_ADDR 0x08
75 #define DMA_CHAN_CUR_CFG 0x0c
76 #define DMA_CHAN_CFG_SRC_DRQ(x) ((x) & 0x1f)
77 #define DMA_CHAN_CFG_SRC_IO_MODE BIT(5)
78 #define DMA_CHAN_CFG_SRC_LINEAR_MODE (0 << 5)
79 #define DMA_CHAN_CFG_SRC_BURST(x) (((x) & 0x3) << 7)
80 #define DMA_CHAN_CFG_SRC_WIDTH(x) (((x) & 0x3) << 9)
82 #define DMA_CHAN_CFG_DST_DRQ(x) (DMA_CHAN_CFG_SRC_DRQ(x) << 16)
83 #define DMA_CHAN_CFG_DST_IO_MODE (DMA_CHAN_CFG_SRC_IO_MODE << 16)
84 #define DMA_CHAN_CFG_DST_LINEAR_MODE (DMA_CHAN_CFG_SRC_LINEAR_MODE << 16)
85 #define DMA_CHAN_CFG_DST_BURST(x) (DMA_CHAN_CFG_SRC_BURST(x) << 16)
86 #define DMA_CHAN_CFG_DST_WIDTH(x) (DMA_CHAN_CFG_SRC_WIDTH(x) << 16)
88 #define DMA_CHAN_CUR_SRC 0x10
90 #define DMA_CHAN_CUR_DST 0x14
92 #define DMA_CHAN_CUR_CNT 0x18
94 #define DMA_CHAN_CUR_PARA 0x1c
98 * Various hardware related defines
100 #define LLI_LAST_ITEM 0xfffff800
101 #define NORMAL_WAIT 8
105 * Hardware representation of the LLI
107 * The hardware will be fed the physical address of this structure,
108 * and read its content in order to start the transfer.
110 struct sun6i_dma_lli
{
119 * This field is not used by the DMA controller, but will be
120 * used by the CPU to go through the list (mostly for dumping
123 struct sun6i_dma_lli
*v_lli_next
;
128 struct virt_dma_desc vd
;
130 struct sun6i_dma_lli
*v_lli
;
136 struct sun6i_vchan
*vchan
;
137 struct sun6i_desc
*desc
;
138 struct sun6i_desc
*done
;
142 struct virt_dma_chan vc
;
143 struct list_head node
;
144 struct dma_slave_config cfg
;
145 struct sun6i_pchan
*phy
;
149 struct sun6i_dma_dev
{
150 struct dma_device slave
;
155 struct reset_control
*rstc
;
156 struct tasklet_struct task
;
157 atomic_t tasklet_shutdown
;
158 struct list_head pending
;
159 struct dma_pool
*pool
;
160 struct sun6i_pchan
*pchans
;
161 struct sun6i_vchan
*vchans
;
164 static struct device
*chan2dev(struct dma_chan
*chan
)
166 return &chan
->dev
->device
;
169 static inline struct sun6i_dma_dev
*to_sun6i_dma_dev(struct dma_device
*d
)
171 return container_of(d
, struct sun6i_dma_dev
, slave
);
174 static inline struct sun6i_vchan
*to_sun6i_vchan(struct dma_chan
*chan
)
176 return container_of(chan
, struct sun6i_vchan
, vc
.chan
);
179 static inline struct sun6i_desc
*
180 to_sun6i_desc(struct dma_async_tx_descriptor
*tx
)
182 return container_of(tx
, struct sun6i_desc
, vd
.tx
);
185 static inline void sun6i_dma_dump_com_regs(struct sun6i_dma_dev
*sdev
)
187 dev_dbg(sdev
->slave
.dev
, "Common register:\n"
188 "\tmask0(%04x): 0x%08x\n"
189 "\tmask1(%04x): 0x%08x\n"
190 "\tpend0(%04x): 0x%08x\n"
191 "\tpend1(%04x): 0x%08x\n"
192 "\tstats(%04x): 0x%08x\n",
193 DMA_IRQ_EN(0), readl(sdev
->base
+ DMA_IRQ_EN(0)),
194 DMA_IRQ_EN(1), readl(sdev
->base
+ DMA_IRQ_EN(1)),
195 DMA_IRQ_STAT(0), readl(sdev
->base
+ DMA_IRQ_STAT(0)),
196 DMA_IRQ_STAT(1), readl(sdev
->base
+ DMA_IRQ_STAT(1)),
197 DMA_STAT
, readl(sdev
->base
+ DMA_STAT
));
200 static inline void sun6i_dma_dump_chan_regs(struct sun6i_dma_dev
*sdev
,
201 struct sun6i_pchan
*pchan
)
203 phys_addr_t reg
= virt_to_phys(pchan
->base
);
205 dev_dbg(sdev
->slave
.dev
, "Chan %d reg: %pa\n"
206 "\t___en(%04x): \t0x%08x\n"
207 "\tpause(%04x): \t0x%08x\n"
208 "\tstart(%04x): \t0x%08x\n"
209 "\t__cfg(%04x): \t0x%08x\n"
210 "\t__src(%04x): \t0x%08x\n"
211 "\t__dst(%04x): \t0x%08x\n"
212 "\tcount(%04x): \t0x%08x\n"
213 "\t_para(%04x): \t0x%08x\n\n",
216 readl(pchan
->base
+ DMA_CHAN_ENABLE
),
218 readl(pchan
->base
+ DMA_CHAN_PAUSE
),
220 readl(pchan
->base
+ DMA_CHAN_LLI_ADDR
),
222 readl(pchan
->base
+ DMA_CHAN_CUR_CFG
),
224 readl(pchan
->base
+ DMA_CHAN_CUR_SRC
),
226 readl(pchan
->base
+ DMA_CHAN_CUR_DST
),
228 readl(pchan
->base
+ DMA_CHAN_CUR_CNT
),
230 readl(pchan
->base
+ DMA_CHAN_CUR_PARA
));
233 static inline int convert_burst(u32 maxburst
, u8
*burst
)
249 static inline int convert_buswidth(enum dma_slave_buswidth addr_width
, u8
*width
)
251 if ((addr_width
< DMA_SLAVE_BUSWIDTH_1_BYTE
) ||
252 (addr_width
> DMA_SLAVE_BUSWIDTH_4_BYTES
))
255 *width
= addr_width
>> 1;
259 static void *sun6i_dma_lli_add(struct sun6i_dma_lli
*prev
,
260 struct sun6i_dma_lli
*next
,
262 struct sun6i_desc
*txd
)
264 if ((!prev
&& !txd
) || !next
)
268 txd
->p_lli
= next_phy
;
271 prev
->p_lli_next
= next_phy
;
272 prev
->v_lli_next
= next
;
275 next
->p_lli_next
= LLI_LAST_ITEM
;
276 next
->v_lli_next
= NULL
;
281 static inline int sun6i_dma_cfg_lli(struct sun6i_dma_lli
*lli
,
283 dma_addr_t dst
, u32 len
,
284 struct dma_slave_config
*config
)
286 u8 src_width
, dst_width
, src_burst
, dst_burst
;
292 ret
= convert_burst(config
->src_maxburst
, &src_burst
);
296 ret
= convert_burst(config
->dst_maxburst
, &dst_burst
);
300 ret
= convert_buswidth(config
->src_addr_width
, &src_width
);
304 ret
= convert_buswidth(config
->dst_addr_width
, &dst_width
);
308 lli
->cfg
= DMA_CHAN_CFG_SRC_BURST(src_burst
) |
309 DMA_CHAN_CFG_SRC_WIDTH(src_width
) |
310 DMA_CHAN_CFG_DST_BURST(dst_burst
) |
311 DMA_CHAN_CFG_DST_WIDTH(dst_width
);
316 lli
->para
= NORMAL_WAIT
;
321 static inline void sun6i_dma_dump_lli(struct sun6i_vchan
*vchan
,
322 struct sun6i_dma_lli
*lli
)
324 phys_addr_t p_lli
= virt_to_phys(lli
);
326 dev_dbg(chan2dev(&vchan
->vc
.chan
),
327 "\n\tdesc: p - %pa v - 0x%p\n"
328 "\t\tc - 0x%08x s - 0x%08x d - 0x%08x\n"
329 "\t\tl - 0x%08x p - 0x%08x n - 0x%08x\n",
331 lli
->cfg
, lli
->src
, lli
->dst
,
332 lli
->len
, lli
->para
, lli
->p_lli_next
);
335 static void sun6i_dma_free_desc(struct virt_dma_desc
*vd
)
337 struct sun6i_desc
*txd
= to_sun6i_desc(&vd
->tx
);
338 struct sun6i_dma_dev
*sdev
= to_sun6i_dma_dev(vd
->tx
.chan
->device
);
339 struct sun6i_dma_lli
*v_lli
, *v_next
;
340 dma_addr_t p_lli
, p_next
;
349 v_next
= v_lli
->v_lli_next
;
350 p_next
= v_lli
->p_lli_next
;
352 dma_pool_free(sdev
->pool
, v_lli
, p_lli
);
361 static int sun6i_dma_terminate_all(struct sun6i_vchan
*vchan
)
363 struct sun6i_dma_dev
*sdev
= to_sun6i_dma_dev(vchan
->vc
.chan
.device
);
364 struct sun6i_pchan
*pchan
= vchan
->phy
;
368 spin_lock(&sdev
->lock
);
369 list_del_init(&vchan
->node
);
370 spin_unlock(&sdev
->lock
);
372 spin_lock_irqsave(&vchan
->vc
.lock
, flags
);
374 vchan_get_all_descriptors(&vchan
->vc
, &head
);
377 writel(DMA_CHAN_ENABLE_STOP
, pchan
->base
+ DMA_CHAN_ENABLE
);
378 writel(DMA_CHAN_PAUSE_RESUME
, pchan
->base
+ DMA_CHAN_PAUSE
);
386 spin_unlock_irqrestore(&vchan
->vc
.lock
, flags
);
388 vchan_dma_desc_free_list(&vchan
->vc
, &head
);
393 static int sun6i_dma_start_desc(struct sun6i_vchan
*vchan
)
395 struct sun6i_dma_dev
*sdev
= to_sun6i_dma_dev(vchan
->vc
.chan
.device
);
396 struct virt_dma_desc
*desc
= vchan_next_desc(&vchan
->vc
);
397 struct sun6i_pchan
*pchan
= vchan
->phy
;
398 u32 irq_val
, irq_reg
, irq_offset
;
409 list_del(&desc
->node
);
411 pchan
->desc
= to_sun6i_desc(&desc
->tx
);
414 sun6i_dma_dump_lli(vchan
, pchan
->desc
->v_lli
);
416 irq_reg
= pchan
->idx
/ DMA_IRQ_CHAN_NR
;
417 irq_offset
= pchan
->idx
% DMA_IRQ_CHAN_NR
;
419 irq_val
= readl(sdev
->base
+ DMA_IRQ_EN(irq_offset
));
420 irq_val
|= DMA_IRQ_QUEUE
<< (irq_offset
* DMA_IRQ_CHAN_WIDTH
);
421 writel(irq_val
, sdev
->base
+ DMA_IRQ_EN(irq_offset
));
423 writel(pchan
->desc
->p_lli
, pchan
->base
+ DMA_CHAN_LLI_ADDR
);
424 writel(DMA_CHAN_ENABLE_START
, pchan
->base
+ DMA_CHAN_ENABLE
);
426 sun6i_dma_dump_com_regs(sdev
);
427 sun6i_dma_dump_chan_regs(sdev
, pchan
);
432 static void sun6i_dma_tasklet(unsigned long data
)
434 struct sun6i_dma_dev
*sdev
= (struct sun6i_dma_dev
*)data
;
435 struct sun6i_vchan
*vchan
;
436 struct sun6i_pchan
*pchan
;
437 unsigned int pchan_alloc
= 0;
438 unsigned int pchan_idx
;
440 list_for_each_entry(vchan
, &sdev
->slave
.channels
, vc
.chan
.device_node
) {
441 spin_lock_irq(&vchan
->vc
.lock
);
445 if (pchan
&& pchan
->done
) {
446 if (sun6i_dma_start_desc(vchan
)) {
448 * No current txd associated with this channel
450 dev_dbg(sdev
->slave
.dev
, "pchan %u: free\n",
453 /* Mark this channel free */
458 spin_unlock_irq(&vchan
->vc
.lock
);
461 spin_lock_irq(&sdev
->lock
);
462 for (pchan_idx
= 0; pchan_idx
< NR_MAX_CHANNELS
; pchan_idx
++) {
463 pchan
= &sdev
->pchans
[pchan_idx
];
465 if (pchan
->vchan
|| list_empty(&sdev
->pending
))
468 vchan
= list_first_entry(&sdev
->pending
,
469 struct sun6i_vchan
, node
);
471 /* Remove from pending channels */
472 list_del_init(&vchan
->node
);
473 pchan_alloc
|= BIT(pchan_idx
);
475 /* Mark this channel allocated */
476 pchan
->vchan
= vchan
;
478 dev_dbg(sdev
->slave
.dev
, "pchan %u: alloc vchan %p\n",
479 pchan
->idx
, &vchan
->vc
);
481 spin_unlock_irq(&sdev
->lock
);
483 for (pchan_idx
= 0; pchan_idx
< NR_MAX_CHANNELS
; pchan_idx
++) {
484 if (!(pchan_alloc
& BIT(pchan_idx
)))
487 pchan
= sdev
->pchans
+ pchan_idx
;
488 vchan
= pchan
->vchan
;
490 spin_lock_irq(&vchan
->vc
.lock
);
491 sun6i_dma_start_desc(vchan
);
492 spin_unlock_irq(&vchan
->vc
.lock
);
497 static irqreturn_t
sun6i_dma_interrupt(int irq
, void *dev_id
)
499 struct sun6i_dma_dev
*sdev
= dev_id
;
500 struct sun6i_vchan
*vchan
;
501 struct sun6i_pchan
*pchan
;
502 int i
, j
, ret
= IRQ_NONE
;
505 for (i
= 0; i
< 2; i
++) {
506 status
= readl(sdev
->base
+ DMA_IRQ_STAT(i
));
510 dev_dbg(sdev
->slave
.dev
, "DMA irq status %s: 0x%x\n",
511 i
? "high" : "low", status
);
513 writel(status
, sdev
->base
+ DMA_IRQ_STAT(i
));
515 for (j
= 0; (j
< 8) && status
; j
++) {
516 if (status
& DMA_IRQ_QUEUE
) {
517 pchan
= sdev
->pchans
+ j
;
518 vchan
= pchan
->vchan
;
521 spin_lock(&vchan
->vc
.lock
);
522 vchan_cookie_complete(&pchan
->desc
->vd
);
523 pchan
->done
= pchan
->desc
;
524 spin_unlock(&vchan
->vc
.lock
);
528 status
= status
>> 4;
531 if (!atomic_read(&sdev
->tasklet_shutdown
))
532 tasklet_schedule(&sdev
->task
);
539 static struct dma_async_tx_descriptor
*sun6i_dma_prep_dma_memcpy(
540 struct dma_chan
*chan
, dma_addr_t dest
, dma_addr_t src
,
541 size_t len
, unsigned long flags
)
543 struct sun6i_dma_dev
*sdev
= to_sun6i_dma_dev(chan
->device
);
544 struct sun6i_vchan
*vchan
= to_sun6i_vchan(chan
);
545 struct dma_slave_config
*sconfig
= &vchan
->cfg
;
546 struct sun6i_dma_lli
*v_lli
;
547 struct sun6i_desc
*txd
;
551 dev_dbg(chan2dev(chan
),
552 "%s; chan: %d, dest: %pad, src: %pad, len: %zu. flags: 0x%08lx\n",
553 __func__
, vchan
->vc
.chan
.chan_id
, &dest
, &src
, len
, flags
);
558 txd
= kzalloc(sizeof(*txd
), GFP_NOWAIT
);
562 v_lli
= dma_pool_alloc(sdev
->pool
, GFP_NOWAIT
, &p_lli
);
564 dev_err(sdev
->slave
.dev
, "Failed to alloc lli memory\n");
569 ret
= sun6i_dma_cfg_lli(v_lli
, src
, dest
, len
, sconfig
);
573 v_lli
->cfg
|= DMA_CHAN_CFG_SRC_DRQ(DRQ_SDRAM
) |
574 DMA_CHAN_CFG_DST_DRQ(DRQ_SDRAM
) |
575 DMA_CHAN_CFG_DST_LINEAR_MODE
|
576 DMA_CHAN_CFG_SRC_LINEAR_MODE
;
578 sun6i_dma_lli_add(NULL
, v_lli
, p_lli
, txd
);
580 sun6i_dma_dump_lli(vchan
, v_lli
);
582 return vchan_tx_prep(&vchan
->vc
, &txd
->vd
, flags
);
585 dma_pool_free(sdev
->pool
, v_lli
, p_lli
);
589 static struct dma_async_tx_descriptor
*sun6i_dma_prep_slave_sg(
590 struct dma_chan
*chan
, struct scatterlist
*sgl
,
591 unsigned int sg_len
, enum dma_transfer_direction dir
,
592 unsigned long flags
, void *context
)
594 struct sun6i_dma_dev
*sdev
= to_sun6i_dma_dev(chan
->device
);
595 struct sun6i_vchan
*vchan
= to_sun6i_vchan(chan
);
596 struct dma_slave_config
*sconfig
= &vchan
->cfg
;
597 struct sun6i_dma_lli
*v_lli
, *prev
= NULL
;
598 struct sun6i_desc
*txd
;
599 struct scatterlist
*sg
;
606 if (!is_slave_direction(dir
)) {
607 dev_err(chan2dev(chan
), "Invalid DMA direction\n");
611 txd
= kzalloc(sizeof(*txd
), GFP_NOWAIT
);
615 for_each_sg(sgl
, sg
, sg_len
, i
) {
616 v_lli
= dma_pool_alloc(sdev
->pool
, GFP_NOWAIT
, &p_lli
);
622 if (dir
== DMA_MEM_TO_DEV
) {
623 ret
= sun6i_dma_cfg_lli(v_lli
, sg_dma_address(sg
),
624 sconfig
->dst_addr
, sg_dma_len(sg
),
629 v_lli
->cfg
|= DMA_CHAN_CFG_DST_IO_MODE
|
630 DMA_CHAN_CFG_SRC_LINEAR_MODE
|
631 DMA_CHAN_CFG_SRC_DRQ(DRQ_SDRAM
) |
632 DMA_CHAN_CFG_DST_DRQ(vchan
->port
);
634 dev_dbg(chan2dev(chan
),
635 "%s; chan: %d, dest: %pad, src: %pad, len: %u. flags: 0x%08lx\n",
636 __func__
, vchan
->vc
.chan
.chan_id
,
637 &sconfig
->dst_addr
, &sg_dma_address(sg
),
638 sg_dma_len(sg
), flags
);
641 ret
= sun6i_dma_cfg_lli(v_lli
, sconfig
->src_addr
,
642 sg_dma_address(sg
), sg_dma_len(sg
),
647 v_lli
->cfg
|= DMA_CHAN_CFG_DST_LINEAR_MODE
|
648 DMA_CHAN_CFG_SRC_IO_MODE
|
649 DMA_CHAN_CFG_DST_DRQ(DRQ_SDRAM
) |
650 DMA_CHAN_CFG_SRC_DRQ(vchan
->port
);
652 dev_dbg(chan2dev(chan
),
653 "%s; chan: %d, dest: %pad, src: %pad, len: %u. flags: 0x%08lx\n",
654 __func__
, vchan
->vc
.chan
.chan_id
,
655 &sg_dma_address(sg
), &sconfig
->src_addr
,
656 sg_dma_len(sg
), flags
);
659 prev
= sun6i_dma_lli_add(prev
, v_lli
, p_lli
, txd
);
662 dev_dbg(chan2dev(chan
), "First: %pad\n", &txd
->p_lli
);
663 for (prev
= txd
->v_lli
; prev
; prev
= prev
->v_lli_next
)
664 sun6i_dma_dump_lli(vchan
, prev
);
666 return vchan_tx_prep(&vchan
->vc
, &txd
->vd
, flags
);
669 dma_pool_free(sdev
->pool
, v_lli
, p_lli
);
673 static int sun6i_dma_control(struct dma_chan
*chan
, enum dma_ctrl_cmd cmd
,
676 struct sun6i_dma_dev
*sdev
= to_sun6i_dma_dev(chan
->device
);
677 struct sun6i_vchan
*vchan
= to_sun6i_vchan(chan
);
678 struct sun6i_pchan
*pchan
= vchan
->phy
;
684 dev_dbg(chan2dev(chan
), "vchan %p: resume\n", &vchan
->vc
);
686 spin_lock_irqsave(&vchan
->vc
.lock
, flags
);
689 writel(DMA_CHAN_PAUSE_RESUME
,
690 pchan
->base
+ DMA_CHAN_PAUSE
);
691 } else if (!list_empty(&vchan
->vc
.desc_issued
)) {
692 spin_lock(&sdev
->lock
);
693 list_add_tail(&vchan
->node
, &sdev
->pending
);
694 spin_unlock(&sdev
->lock
);
697 spin_unlock_irqrestore(&vchan
->vc
.lock
, flags
);
701 dev_dbg(chan2dev(chan
), "vchan %p: pause\n", &vchan
->vc
);
704 writel(DMA_CHAN_PAUSE_PAUSE
,
705 pchan
->base
+ DMA_CHAN_PAUSE
);
707 spin_lock(&sdev
->lock
);
708 list_del_init(&vchan
->node
);
709 spin_unlock(&sdev
->lock
);
713 case DMA_TERMINATE_ALL
:
714 ret
= sun6i_dma_terminate_all(vchan
);
716 case DMA_SLAVE_CONFIG
:
717 memcpy(&vchan
->cfg
, (void *)arg
, sizeof(struct dma_slave_config
));
726 static enum dma_status
sun6i_dma_tx_status(struct dma_chan
*chan
,
728 struct dma_tx_state
*state
)
730 struct sun6i_vchan
*vchan
= to_sun6i_vchan(chan
);
731 struct sun6i_pchan
*pchan
= vchan
->phy
;
732 struct sun6i_dma_lli
*lli
;
733 struct virt_dma_desc
*vd
;
734 struct sun6i_desc
*txd
;
739 ret
= dma_cookie_status(chan
, cookie
, state
);
740 if (ret
== DMA_COMPLETE
)
743 spin_lock_irqsave(&vchan
->vc
.lock
, flags
);
745 vd
= vchan_find_desc(&vchan
->vc
, cookie
);
746 txd
= to_sun6i_desc(&vd
->tx
);
749 for (lli
= txd
->v_lli
; lli
!= NULL
; lli
= lli
->v_lli_next
)
751 } else if (!pchan
|| !pchan
->desc
) {
754 bytes
= readl(pchan
->base
+ DMA_CHAN_CUR_CNT
);
757 spin_unlock_irqrestore(&vchan
->vc
.lock
, flags
);
759 dma_set_residue(state
, bytes
);
764 static void sun6i_dma_issue_pending(struct dma_chan
*chan
)
766 struct sun6i_dma_dev
*sdev
= to_sun6i_dma_dev(chan
->device
);
767 struct sun6i_vchan
*vchan
= to_sun6i_vchan(chan
);
770 spin_lock_irqsave(&vchan
->vc
.lock
, flags
);
772 if (vchan_issue_pending(&vchan
->vc
)) {
773 spin_lock(&sdev
->lock
);
775 if (!vchan
->phy
&& list_empty(&vchan
->node
)) {
776 list_add_tail(&vchan
->node
, &sdev
->pending
);
777 tasklet_schedule(&sdev
->task
);
778 dev_dbg(chan2dev(chan
), "vchan %p: issued\n",
782 spin_unlock(&sdev
->lock
);
784 dev_dbg(chan2dev(chan
), "vchan %p: nothing to issue\n",
788 spin_unlock_irqrestore(&vchan
->vc
.lock
, flags
);
791 static int sun6i_dma_alloc_chan_resources(struct dma_chan
*chan
)
796 static void sun6i_dma_free_chan_resources(struct dma_chan
*chan
)
798 struct sun6i_dma_dev
*sdev
= to_sun6i_dma_dev(chan
->device
);
799 struct sun6i_vchan
*vchan
= to_sun6i_vchan(chan
);
802 spin_lock_irqsave(&sdev
->lock
, flags
);
803 list_del_init(&vchan
->node
);
804 spin_unlock_irqrestore(&sdev
->lock
, flags
);
806 vchan_free_chan_resources(&vchan
->vc
);
809 static struct dma_chan
*sun6i_dma_of_xlate(struct of_phandle_args
*dma_spec
,
810 struct of_dma
*ofdma
)
812 struct sun6i_dma_dev
*sdev
= ofdma
->of_dma_data
;
813 struct sun6i_vchan
*vchan
;
814 struct dma_chan
*chan
;
815 u8 port
= dma_spec
->args
[0];
817 if (port
> NR_MAX_REQUESTS
)
820 chan
= dma_get_any_slave_channel(&sdev
->slave
);
824 vchan
= to_sun6i_vchan(chan
);
830 static inline void sun6i_kill_tasklet(struct sun6i_dma_dev
*sdev
)
832 /* Disable all interrupts from DMA */
833 writel(0, sdev
->base
+ DMA_IRQ_EN(0));
834 writel(0, sdev
->base
+ DMA_IRQ_EN(1));
836 /* Prevent spurious interrupts from scheduling the tasklet */
837 atomic_inc(&sdev
->tasklet_shutdown
);
839 /* Make sure all interrupts are handled */
840 synchronize_irq(sdev
->irq
);
842 /* Actually prevent the tasklet from being scheduled */
843 tasklet_kill(&sdev
->task
);
846 static inline void sun6i_dma_free(struct sun6i_dma_dev
*sdev
)
850 for (i
= 0; i
< NR_MAX_VCHANS
; i
++) {
851 struct sun6i_vchan
*vchan
= &sdev
->vchans
[i
];
853 list_del(&vchan
->vc
.chan
.device_node
);
854 tasklet_kill(&vchan
->vc
.task
);
858 static int sun6i_dma_probe(struct platform_device
*pdev
)
860 struct sun6i_dma_dev
*sdc
;
861 struct resource
*res
;
862 struct clk
*mux
, *pll6
;
865 sdc
= devm_kzalloc(&pdev
->dev
, sizeof(*sdc
), GFP_KERNEL
);
869 res
= platform_get_resource(pdev
, IORESOURCE_MEM
, 0);
870 sdc
->base
= devm_ioremap_resource(&pdev
->dev
, res
);
871 if (IS_ERR(sdc
->base
))
872 return PTR_ERR(sdc
->base
);
874 sdc
->irq
= platform_get_irq(pdev
, 0);
876 dev_err(&pdev
->dev
, "Cannot claim IRQ\n");
880 sdc
->clk
= devm_clk_get(&pdev
->dev
, NULL
);
881 if (IS_ERR(sdc
->clk
)) {
882 dev_err(&pdev
->dev
, "No clock specified\n");
883 return PTR_ERR(sdc
->clk
);
886 mux
= clk_get(NULL
, "ahb1_mux");
888 dev_err(&pdev
->dev
, "Couldn't get AHB1 Mux\n");
892 pll6
= clk_get(NULL
, "pll6");
894 dev_err(&pdev
->dev
, "Couldn't get PLL6\n");
896 return PTR_ERR(pll6
);
899 ret
= clk_set_parent(mux
, pll6
);
904 dev_err(&pdev
->dev
, "Couldn't reparent AHB1 on PLL6\n");
908 sdc
->rstc
= devm_reset_control_get(&pdev
->dev
, NULL
);
909 if (IS_ERR(sdc
->rstc
)) {
910 dev_err(&pdev
->dev
, "No reset controller specified\n");
911 return PTR_ERR(sdc
->rstc
);
914 sdc
->pool
= dmam_pool_create(dev_name(&pdev
->dev
), &pdev
->dev
,
915 sizeof(struct sun6i_dma_lli
), 4, 0);
917 dev_err(&pdev
->dev
, "No memory for descriptors dma pool\n");
921 platform_set_drvdata(pdev
, sdc
);
922 INIT_LIST_HEAD(&sdc
->pending
);
923 spin_lock_init(&sdc
->lock
);
925 dma_cap_set(DMA_PRIVATE
, sdc
->slave
.cap_mask
);
926 dma_cap_set(DMA_MEMCPY
, sdc
->slave
.cap_mask
);
927 dma_cap_set(DMA_SLAVE
, sdc
->slave
.cap_mask
);
929 INIT_LIST_HEAD(&sdc
->slave
.channels
);
930 sdc
->slave
.device_alloc_chan_resources
= sun6i_dma_alloc_chan_resources
;
931 sdc
->slave
.device_free_chan_resources
= sun6i_dma_free_chan_resources
;
932 sdc
->slave
.device_tx_status
= sun6i_dma_tx_status
;
933 sdc
->slave
.device_issue_pending
= sun6i_dma_issue_pending
;
934 sdc
->slave
.device_prep_slave_sg
= sun6i_dma_prep_slave_sg
;
935 sdc
->slave
.device_prep_dma_memcpy
= sun6i_dma_prep_dma_memcpy
;
936 sdc
->slave
.device_control
= sun6i_dma_control
;
937 sdc
->slave
.chancnt
= NR_MAX_VCHANS
;
939 sdc
->slave
.dev
= &pdev
->dev
;
941 sdc
->pchans
= devm_kcalloc(&pdev
->dev
, NR_MAX_CHANNELS
,
942 sizeof(struct sun6i_pchan
), GFP_KERNEL
);
946 sdc
->vchans
= devm_kcalloc(&pdev
->dev
, NR_MAX_VCHANS
,
947 sizeof(struct sun6i_vchan
), GFP_KERNEL
);
951 tasklet_init(&sdc
->task
, sun6i_dma_tasklet
, (unsigned long)sdc
);
953 for (i
= 0; i
< NR_MAX_CHANNELS
; i
++) {
954 struct sun6i_pchan
*pchan
= &sdc
->pchans
[i
];
957 pchan
->base
= sdc
->base
+ 0x100 + i
* 0x40;
960 for (i
= 0; i
< NR_MAX_VCHANS
; i
++) {
961 struct sun6i_vchan
*vchan
= &sdc
->vchans
[i
];
963 INIT_LIST_HEAD(&vchan
->node
);
964 vchan
->vc
.desc_free
= sun6i_dma_free_desc
;
965 vchan_init(&vchan
->vc
, &sdc
->slave
);
968 ret
= reset_control_deassert(sdc
->rstc
);
970 dev_err(&pdev
->dev
, "Couldn't deassert the device from reset\n");
974 ret
= clk_prepare_enable(sdc
->clk
);
976 dev_err(&pdev
->dev
, "Couldn't enable the clock\n");
977 goto err_reset_assert
;
980 ret
= devm_request_irq(&pdev
->dev
, sdc
->irq
, sun6i_dma_interrupt
, 0,
981 dev_name(&pdev
->dev
), sdc
);
983 dev_err(&pdev
->dev
, "Cannot request IRQ\n");
984 goto err_clk_disable
;
987 ret
= dma_async_device_register(&sdc
->slave
);
989 dev_warn(&pdev
->dev
, "Failed to register DMA engine device\n");
990 goto err_irq_disable
;
993 ret
= of_dma_controller_register(pdev
->dev
.of_node
, sun6i_dma_of_xlate
,
996 dev_err(&pdev
->dev
, "of_dma_controller_register failed\n");
997 goto err_dma_unregister
;
1003 dma_async_device_unregister(&sdc
->slave
);
1005 sun6i_kill_tasklet(sdc
);
1007 clk_disable_unprepare(sdc
->clk
);
1009 reset_control_assert(sdc
->rstc
);
1011 sun6i_dma_free(sdc
);
1015 static int sun6i_dma_remove(struct platform_device
*pdev
)
1017 struct sun6i_dma_dev
*sdc
= platform_get_drvdata(pdev
);
1019 of_dma_controller_free(pdev
->dev
.of_node
);
1020 dma_async_device_unregister(&sdc
->slave
);
1022 sun6i_kill_tasklet(sdc
);
1024 clk_disable_unprepare(sdc
->clk
);
1025 reset_control_assert(sdc
->rstc
);
1027 sun6i_dma_free(sdc
);
1032 static struct of_device_id sun6i_dma_match
[] = {
1033 { .compatible
= "allwinner,sun6i-a31-dma" },
1037 static struct platform_driver sun6i_dma_driver
= {
1038 .probe
= sun6i_dma_probe
,
1039 .remove
= sun6i_dma_remove
,
1041 .name
= "sun6i-dma",
1042 .of_match_table
= sun6i_dma_match
,
1045 module_platform_driver(sun6i_dma_driver
);
1047 MODULE_DESCRIPTION("Allwinner A31 DMA Controller Driver");
1048 MODULE_AUTHOR("Sugar <shuge@allwinnertech.com>");
1049 MODULE_AUTHOR("Maxime Ripard <maxime.ripard@free-electrons.com>");
1050 MODULE_LICENSE("GPL");