xref: /linux/drivers/dma/sun6i-dma.c (revision 0ea5c948cb64bab5bc7a5516774eb8536f05aa0d)
1 // SPDX-License-Identifier: GPL-2.0-or-later
2 /*
3  * Copyright (C) 2013-2014 Allwinner Tech Co., Ltd
4  * Author: Sugar <shuge@allwinnertech.com>
5  *
6  * Copyright (C) 2014 Maxime Ripard
7  * Maxime Ripard <maxime.ripard@free-electrons.com>
8  */
9 
10 #include <linux/clk.h>
11 #include <linux/delay.h>
12 #include <linux/dma-mapping.h>
13 #include <linux/dmaengine.h>
14 #include <linux/dmapool.h>
15 #include <linux/interrupt.h>
16 #include <linux/module.h>
17 #include <linux/of.h>
18 #include <linux/of_dma.h>
19 #include <linux/platform_device.h>
20 #include <linux/reset.h>
21 #include <linux/slab.h>
22 #include <linux/types.h>
23 
24 #include "virt-dma.h"
25 
26 /*
27  * Common registers
28  */
29 #define DMA_IRQ_EN(x)		((x) * 0x04)
30 #define DMA_IRQ_HALF			BIT(0)
31 #define DMA_IRQ_PKG			BIT(1)
32 #define DMA_IRQ_QUEUE			BIT(2)
33 
34 #define DMA_IRQ_CHAN_NR			8
35 #define DMA_IRQ_CHAN_WIDTH		4
36 
37 
38 #define DMA_IRQ_STAT(x)		((x) * 0x04 + 0x10)
39 
40 #define DMA_STAT		0x30
41 
42 /* Offset between DMA_IRQ_EN and DMA_IRQ_STAT limits number of channels */
43 #define DMA_MAX_CHANNELS	(DMA_IRQ_CHAN_NR * 0x10 / 4)
44 
45 /*
46  * sun8i specific registers
47  */
48 #define SUN8I_DMA_GATE		0x20
49 #define SUN8I_DMA_GATE_ENABLE	0x4
50 
51 #define SUNXI_H3_SECURE_REG		0x20
52 #define SUNXI_H3_DMA_GATE		0x28
53 #define SUNXI_H3_DMA_GATE_ENABLE	0x4
54 /*
55  * Channels specific registers
56  */
57 #define DMA_CHAN_ENABLE		0x00
58 #define DMA_CHAN_ENABLE_START		BIT(0)
59 #define DMA_CHAN_ENABLE_STOP		0
60 
61 #define DMA_CHAN_PAUSE		0x04
62 #define DMA_CHAN_PAUSE_PAUSE		BIT(1)
63 #define DMA_CHAN_PAUSE_RESUME		0
64 
65 #define DMA_CHAN_LLI_ADDR	0x08
66 
67 #define DMA_CHAN_CUR_CFG	0x0c
68 #define DMA_CHAN_MAX_DRQ_A31		0x1f
69 #define DMA_CHAN_MAX_DRQ_H6		0x3f
70 #define DMA_CHAN_CFG_SRC_DRQ_A31(x)	((x) & DMA_CHAN_MAX_DRQ_A31)
71 #define DMA_CHAN_CFG_SRC_DRQ_H6(x)	((x) & DMA_CHAN_MAX_DRQ_H6)
72 #define DMA_CHAN_CFG_SRC_MODE_A31(x)	(((x) & 0x1) << 5)
73 #define DMA_CHAN_CFG_SRC_MODE_H6(x)	(((x) & 0x1) << 8)
74 #define DMA_CHAN_CFG_SRC_BURST_A31(x)	(((x) & 0x3) << 7)
75 #define DMA_CHAN_CFG_SRC_BURST_H3(x)	(((x) & 0x3) << 6)
76 #define DMA_CHAN_CFG_SRC_WIDTH(x)	(((x) & 0x3) << 9)
77 
78 #define DMA_CHAN_CFG_DST_DRQ_A31(x)	(DMA_CHAN_CFG_SRC_DRQ_A31(x) << 16)
79 #define DMA_CHAN_CFG_DST_DRQ_H6(x)	(DMA_CHAN_CFG_SRC_DRQ_H6(x) << 16)
80 #define DMA_CHAN_CFG_DST_MODE_A31(x)	(DMA_CHAN_CFG_SRC_MODE_A31(x) << 16)
81 #define DMA_CHAN_CFG_DST_MODE_H6(x)	(DMA_CHAN_CFG_SRC_MODE_H6(x) << 16)
82 #define DMA_CHAN_CFG_DST_BURST_A31(x)	(DMA_CHAN_CFG_SRC_BURST_A31(x) << 16)
83 #define DMA_CHAN_CFG_DST_BURST_H3(x)	(DMA_CHAN_CFG_SRC_BURST_H3(x) << 16)
84 #define DMA_CHAN_CFG_DST_WIDTH(x)	(DMA_CHAN_CFG_SRC_WIDTH(x) << 16)
85 
86 #define DMA_CHAN_CUR_SRC	0x10
87 
88 #define DMA_CHAN_CUR_DST	0x14
89 
90 #define DMA_CHAN_CUR_CNT	0x18
91 
92 #define DMA_CHAN_CUR_PARA	0x1c
93 
94 /*
95  * LLI address mangling
96  *
97  * The LLI link physical address is also mangled, but we avoid dealing
98  * with that by allocating LLIs from the DMA32 zone.
99  */
100 #define SRC_HIGH_ADDR(x)		(((x) & 0x3U) << 16)
101 #define DST_HIGH_ADDR(x)		(((x) & 0x3U) << 18)
102 
103 /*
104  * Various hardware related defines
105  */
106 #define LLI_LAST_ITEM	0xfffff800
107 #define NORMAL_WAIT	8
108 #define DRQ_SDRAM	1
109 #define LINEAR_MODE     0
110 #define IO_MODE         1
111 
112 /* forward declaration */
113 struct sun6i_dma_dev;
114 
115 /*
116  * Hardware channels / ports representation
117  *
118  * The hardware is used in several SoCs, with differing numbers
119  * of channels and endpoints. This structure ties those numbers
120  * to a certain compatible string.
121  */
122 struct sun6i_dma_config {
123 	u32 nr_max_channels;
124 	u32 nr_max_requests;
125 	u32 nr_max_vchans;
126 	/*
127 	 * In the datasheets/user manuals of newer Allwinner SoCs, a special
128 	 * bit (bit 2 at register 0x20) is present.
129 	 * It's named "DMA MCLK interface circuit auto gating bit" in the
130 	 * documents, and the footnote of this register says that this bit
131 	 * should be set up when initializing the DMA controller.
132 	 * Allwinner A23/A33 user manuals do not have this bit documented,
133 	 * however these SoCs really have and need this bit, as seen in the
134 	 * BSP kernel source code.
135 	 */
136 	void (*clock_autogate_enable)(struct sun6i_dma_dev *);
137 	void (*set_burst_length)(u32 *p_cfg, s8 src_burst, s8 dst_burst);
138 	void (*set_drq)(u32 *p_cfg, s8 src_drq, s8 dst_drq);
139 	void (*set_mode)(u32 *p_cfg, s8 src_mode, s8 dst_mode);
140 	u32 src_burst_lengths;
141 	u32 dst_burst_lengths;
142 	u32 src_addr_widths;
143 	u32 dst_addr_widths;
144 	bool has_high_addr;
145 	bool has_mbus_clk;
146 };
147 
148 /*
149  * Hardware representation of the LLI
150  *
151  * The hardware will be fed the physical address of this structure,
152  * and read its content in order to start the transfer.
153  */
154 struct sun6i_dma_lli {
155 	u32			cfg;
156 	u32			src;
157 	u32			dst;
158 	u32			len;
159 	u32			para;
160 	u32			p_lli_next;
161 
162 	/*
163 	 * This field is not used by the DMA controller, but will be
164 	 * used by the CPU to go through the list (mostly for dumping
165 	 * or freeing it).
166 	 */
167 	struct sun6i_dma_lli	*v_lli_next;
168 };
169 
170 
171 struct sun6i_desc {
172 	struct virt_dma_desc	vd;
173 	dma_addr_t		p_lli;
174 	struct sun6i_dma_lli	*v_lli;
175 };
176 
177 struct sun6i_pchan {
178 	u32			idx;
179 	void __iomem		*base;
180 	struct sun6i_vchan	*vchan;
181 	struct sun6i_desc	*desc;
182 	struct sun6i_desc	*done;
183 };
184 
185 struct sun6i_vchan {
186 	struct virt_dma_chan	vc;
187 	struct list_head	node;
188 	struct dma_slave_config	cfg;
189 	struct sun6i_pchan	*phy;
190 	u8			port;
191 	u8			irq_type;
192 	bool			cyclic;
193 };
194 
195 struct sun6i_dma_dev {
196 	struct dma_device	slave;
197 	void __iomem		*base;
198 	struct clk		*clk;
199 	struct clk		*clk_mbus;
200 	int			irq;
201 	spinlock_t		lock;
202 	struct reset_control	*rstc;
203 	struct tasklet_struct	task;
204 	atomic_t		tasklet_shutdown;
205 	struct list_head	pending;
206 	struct dma_pool		*pool;
207 	struct sun6i_pchan	*pchans;
208 	struct sun6i_vchan	*vchans;
209 	const struct sun6i_dma_config *cfg;
210 	u32			num_pchans;
211 	u32			num_vchans;
212 	u32			max_request;
213 };
214 
chan2dev(struct dma_chan * chan)215 static struct device *chan2dev(struct dma_chan *chan)
216 {
217 	return &chan->dev->device;
218 }
219 
to_sun6i_dma_dev(struct dma_device * d)220 static inline struct sun6i_dma_dev *to_sun6i_dma_dev(struct dma_device *d)
221 {
222 	return container_of(d, struct sun6i_dma_dev, slave);
223 }
224 
to_sun6i_vchan(struct dma_chan * chan)225 static inline struct sun6i_vchan *to_sun6i_vchan(struct dma_chan *chan)
226 {
227 	return container_of(chan, struct sun6i_vchan, vc.chan);
228 }
229 
230 static inline struct sun6i_desc *
to_sun6i_desc(struct dma_async_tx_descriptor * tx)231 to_sun6i_desc(struct dma_async_tx_descriptor *tx)
232 {
233 	return container_of(tx, struct sun6i_desc, vd.tx);
234 }
235 
sun6i_dma_dump_com_regs(struct sun6i_dma_dev * sdev)236 static inline void sun6i_dma_dump_com_regs(struct sun6i_dma_dev *sdev)
237 {
238 	dev_dbg(sdev->slave.dev, "Common register:\n"
239 		"\tmask0(%04x): 0x%08x\n"
240 		"\tmask1(%04x): 0x%08x\n"
241 		"\tpend0(%04x): 0x%08x\n"
242 		"\tpend1(%04x): 0x%08x\n"
243 		"\tstats(%04x): 0x%08x\n",
244 		DMA_IRQ_EN(0), readl(sdev->base + DMA_IRQ_EN(0)),
245 		DMA_IRQ_EN(1), readl(sdev->base + DMA_IRQ_EN(1)),
246 		DMA_IRQ_STAT(0), readl(sdev->base + DMA_IRQ_STAT(0)),
247 		DMA_IRQ_STAT(1), readl(sdev->base + DMA_IRQ_STAT(1)),
248 		DMA_STAT, readl(sdev->base + DMA_STAT));
249 }
250 
sun6i_dma_dump_chan_regs(struct sun6i_dma_dev * sdev,struct sun6i_pchan * pchan)251 static inline void sun6i_dma_dump_chan_regs(struct sun6i_dma_dev *sdev,
252 					    struct sun6i_pchan *pchan)
253 {
254 	dev_dbg(sdev->slave.dev, "Chan %d reg:\n"
255 		"\t___en(%04x): \t0x%08x\n"
256 		"\tpause(%04x): \t0x%08x\n"
257 		"\tstart(%04x): \t0x%08x\n"
258 		"\t__cfg(%04x): \t0x%08x\n"
259 		"\t__src(%04x): \t0x%08x\n"
260 		"\t__dst(%04x): \t0x%08x\n"
261 		"\tcount(%04x): \t0x%08x\n"
262 		"\t_para(%04x): \t0x%08x\n\n",
263 		pchan->idx,
264 		DMA_CHAN_ENABLE,
265 		readl(pchan->base + DMA_CHAN_ENABLE),
266 		DMA_CHAN_PAUSE,
267 		readl(pchan->base + DMA_CHAN_PAUSE),
268 		DMA_CHAN_LLI_ADDR,
269 		readl(pchan->base + DMA_CHAN_LLI_ADDR),
270 		DMA_CHAN_CUR_CFG,
271 		readl(pchan->base + DMA_CHAN_CUR_CFG),
272 		DMA_CHAN_CUR_SRC,
273 		readl(pchan->base + DMA_CHAN_CUR_SRC),
274 		DMA_CHAN_CUR_DST,
275 		readl(pchan->base + DMA_CHAN_CUR_DST),
276 		DMA_CHAN_CUR_CNT,
277 		readl(pchan->base + DMA_CHAN_CUR_CNT),
278 		DMA_CHAN_CUR_PARA,
279 		readl(pchan->base + DMA_CHAN_CUR_PARA));
280 }
281 
convert_burst(u32 maxburst)282 static inline s8 convert_burst(u32 maxburst)
283 {
284 	switch (maxburst) {
285 	case 1:
286 		return 0;
287 	case 4:
288 		return 1;
289 	case 8:
290 		return 2;
291 	case 16:
292 		return 3;
293 	default:
294 		return -EINVAL;
295 	}
296 }
297 
convert_buswidth(enum dma_slave_buswidth addr_width)298 static inline s8 convert_buswidth(enum dma_slave_buswidth addr_width)
299 {
300 	return ilog2(addr_width);
301 }
302 
sun6i_enable_clock_autogate_a23(struct sun6i_dma_dev * sdev)303 static void sun6i_enable_clock_autogate_a23(struct sun6i_dma_dev *sdev)
304 {
305 	writel(SUN8I_DMA_GATE_ENABLE, sdev->base + SUN8I_DMA_GATE);
306 }
307 
sun6i_enable_clock_autogate_h3(struct sun6i_dma_dev * sdev)308 static void sun6i_enable_clock_autogate_h3(struct sun6i_dma_dev *sdev)
309 {
310 	writel(SUNXI_H3_DMA_GATE_ENABLE, sdev->base + SUNXI_H3_DMA_GATE);
311 }
312 
sun6i_set_burst_length_a31(u32 * p_cfg,s8 src_burst,s8 dst_burst)313 static void sun6i_set_burst_length_a31(u32 *p_cfg, s8 src_burst, s8 dst_burst)
314 {
315 	*p_cfg |= DMA_CHAN_CFG_SRC_BURST_A31(src_burst) |
316 		  DMA_CHAN_CFG_DST_BURST_A31(dst_burst);
317 }
318 
sun6i_set_burst_length_h3(u32 * p_cfg,s8 src_burst,s8 dst_burst)319 static void sun6i_set_burst_length_h3(u32 *p_cfg, s8 src_burst, s8 dst_burst)
320 {
321 	*p_cfg |= DMA_CHAN_CFG_SRC_BURST_H3(src_burst) |
322 		  DMA_CHAN_CFG_DST_BURST_H3(dst_burst);
323 }
324 
sun6i_set_drq_a31(u32 * p_cfg,s8 src_drq,s8 dst_drq)325 static void sun6i_set_drq_a31(u32 *p_cfg, s8 src_drq, s8 dst_drq)
326 {
327 	*p_cfg |= DMA_CHAN_CFG_SRC_DRQ_A31(src_drq) |
328 		  DMA_CHAN_CFG_DST_DRQ_A31(dst_drq);
329 }
330 
sun6i_set_drq_h6(u32 * p_cfg,s8 src_drq,s8 dst_drq)331 static void sun6i_set_drq_h6(u32 *p_cfg, s8 src_drq, s8 dst_drq)
332 {
333 	*p_cfg |= DMA_CHAN_CFG_SRC_DRQ_H6(src_drq) |
334 		  DMA_CHAN_CFG_DST_DRQ_H6(dst_drq);
335 }
336 
sun6i_set_mode_a31(u32 * p_cfg,s8 src_mode,s8 dst_mode)337 static void sun6i_set_mode_a31(u32 *p_cfg, s8 src_mode, s8 dst_mode)
338 {
339 	*p_cfg |= DMA_CHAN_CFG_SRC_MODE_A31(src_mode) |
340 		  DMA_CHAN_CFG_DST_MODE_A31(dst_mode);
341 }
342 
sun6i_set_mode_h6(u32 * p_cfg,s8 src_mode,s8 dst_mode)343 static void sun6i_set_mode_h6(u32 *p_cfg, s8 src_mode, s8 dst_mode)
344 {
345 	*p_cfg |= DMA_CHAN_CFG_SRC_MODE_H6(src_mode) |
346 		  DMA_CHAN_CFG_DST_MODE_H6(dst_mode);
347 }
348 
sun6i_get_chan_size(struct sun6i_pchan * pchan)349 static size_t sun6i_get_chan_size(struct sun6i_pchan *pchan)
350 {
351 	struct sun6i_desc *txd = pchan->desc;
352 	struct sun6i_dma_lli *lli;
353 	size_t bytes;
354 	dma_addr_t pos;
355 
356 	pos = readl(pchan->base + DMA_CHAN_LLI_ADDR);
357 	bytes = readl(pchan->base + DMA_CHAN_CUR_CNT);
358 
359 	if (pos == LLI_LAST_ITEM)
360 		return bytes;
361 
362 	for (lli = txd->v_lli; lli; lli = lli->v_lli_next) {
363 		if (lli->p_lli_next == pos) {
364 			for (lli = lli->v_lli_next; lli; lli = lli->v_lli_next)
365 				bytes += lli->len;
366 			break;
367 		}
368 	}
369 
370 	return bytes;
371 }
372 
sun6i_dma_lli_add(struct sun6i_dma_lli * prev,struct sun6i_dma_lli * next,dma_addr_t next_phy,struct sun6i_desc * txd)373 static void *sun6i_dma_lli_add(struct sun6i_dma_lli *prev,
374 			       struct sun6i_dma_lli *next,
375 			       dma_addr_t next_phy,
376 			       struct sun6i_desc *txd)
377 {
378 	if ((!prev && !txd) || !next)
379 		return NULL;
380 
381 	if (!prev) {
382 		txd->p_lli = next_phy;
383 		txd->v_lli = next;
384 	} else {
385 		prev->p_lli_next = next_phy;
386 		prev->v_lli_next = next;
387 	}
388 
389 	next->p_lli_next = LLI_LAST_ITEM;
390 	next->v_lli_next = NULL;
391 
392 	return next;
393 }
394 
sun6i_dma_dump_lli(struct sun6i_vchan * vchan,struct sun6i_dma_lli * v_lli,dma_addr_t p_lli)395 static inline void sun6i_dma_dump_lli(struct sun6i_vchan *vchan,
396 				      struct sun6i_dma_lli *v_lli,
397 				      dma_addr_t p_lli)
398 {
399 	dev_dbg(chan2dev(&vchan->vc.chan),
400 		"\n\tdesc:\tp - %pad v - 0x%p\n"
401 		"\t\tc - 0x%08x s - 0x%08x d - 0x%08x\n"
402 		"\t\tl - 0x%08x p - 0x%08x n - 0x%08x\n",
403 		&p_lli, v_lli,
404 		v_lli->cfg, v_lli->src, v_lli->dst,
405 		v_lli->len, v_lli->para, v_lli->p_lli_next);
406 }
407 
sun6i_dma_free_desc(struct virt_dma_desc * vd)408 static void sun6i_dma_free_desc(struct virt_dma_desc *vd)
409 {
410 	struct sun6i_desc *txd = to_sun6i_desc(&vd->tx);
411 	struct sun6i_dma_dev *sdev = to_sun6i_dma_dev(vd->tx.chan->device);
412 	struct sun6i_dma_lli *v_lli, *v_next;
413 	dma_addr_t p_lli, p_next;
414 
415 	if (unlikely(!txd))
416 		return;
417 
418 	p_lli = txd->p_lli;
419 	v_lli = txd->v_lli;
420 
421 	while (v_lli) {
422 		v_next = v_lli->v_lli_next;
423 		p_next = v_lli->p_lli_next;
424 
425 		dma_pool_free(sdev->pool, v_lli, p_lli);
426 
427 		v_lli = v_next;
428 		p_lli = p_next;
429 	}
430 
431 	kfree(txd);
432 }
433 
sun6i_dma_start_desc(struct sun6i_vchan * vchan)434 static int sun6i_dma_start_desc(struct sun6i_vchan *vchan)
435 {
436 	struct sun6i_dma_dev *sdev = to_sun6i_dma_dev(vchan->vc.chan.device);
437 	struct virt_dma_desc *desc = vchan_next_desc(&vchan->vc);
438 	struct sun6i_pchan *pchan = vchan->phy;
439 	u32 irq_val, irq_reg, irq_offset;
440 
441 	if (!pchan)
442 		return -EAGAIN;
443 
444 	if (!desc) {
445 		pchan->desc = NULL;
446 		pchan->done = NULL;
447 		return -EAGAIN;
448 	}
449 
450 	list_del(&desc->node);
451 
452 	pchan->desc = to_sun6i_desc(&desc->tx);
453 	pchan->done = NULL;
454 
455 	sun6i_dma_dump_lli(vchan, pchan->desc->v_lli, pchan->desc->p_lli);
456 
457 	irq_reg = pchan->idx / DMA_IRQ_CHAN_NR;
458 	irq_offset = pchan->idx % DMA_IRQ_CHAN_NR;
459 
460 	vchan->irq_type = vchan->cyclic ? DMA_IRQ_PKG : DMA_IRQ_QUEUE;
461 
462 	irq_val = readl(sdev->base + DMA_IRQ_EN(irq_reg));
463 	irq_val &= ~((DMA_IRQ_HALF | DMA_IRQ_PKG | DMA_IRQ_QUEUE) <<
464 			(irq_offset * DMA_IRQ_CHAN_WIDTH));
465 	irq_val |= vchan->irq_type << (irq_offset * DMA_IRQ_CHAN_WIDTH);
466 	writel(irq_val, sdev->base + DMA_IRQ_EN(irq_reg));
467 
468 	writel(pchan->desc->p_lli, pchan->base + DMA_CHAN_LLI_ADDR);
469 	writel(DMA_CHAN_ENABLE_START, pchan->base + DMA_CHAN_ENABLE);
470 
471 	sun6i_dma_dump_com_regs(sdev);
472 	sun6i_dma_dump_chan_regs(sdev, pchan);
473 
474 	return 0;
475 }
476 
sun6i_dma_tasklet(struct tasklet_struct * t)477 static void sun6i_dma_tasklet(struct tasklet_struct *t)
478 {
479 	struct sun6i_dma_dev *sdev = from_tasklet(sdev, t, task);
480 	struct sun6i_vchan *vchan;
481 	struct sun6i_pchan *pchan;
482 	unsigned int pchan_alloc = 0;
483 	unsigned int pchan_idx;
484 
485 	list_for_each_entry(vchan, &sdev->slave.channels, vc.chan.device_node) {
486 		spin_lock_irq(&vchan->vc.lock);
487 
488 		pchan = vchan->phy;
489 
490 		if (pchan && pchan->done) {
491 			if (sun6i_dma_start_desc(vchan)) {
492 				/*
493 				 * No current txd associated with this channel
494 				 */
495 				dev_dbg(sdev->slave.dev, "pchan %u: free\n",
496 					pchan->idx);
497 
498 				/* Mark this channel free */
499 				vchan->phy = NULL;
500 				pchan->vchan = NULL;
501 			}
502 		}
503 		spin_unlock_irq(&vchan->vc.lock);
504 	}
505 
506 	spin_lock_irq(&sdev->lock);
507 	for (pchan_idx = 0; pchan_idx < sdev->num_pchans; pchan_idx++) {
508 		pchan = &sdev->pchans[pchan_idx];
509 
510 		if (pchan->vchan || list_empty(&sdev->pending))
511 			continue;
512 
513 		vchan = list_first_entry(&sdev->pending,
514 					 struct sun6i_vchan, node);
515 
516 		/* Remove from pending channels */
517 		list_del_init(&vchan->node);
518 		pchan_alloc |= BIT(pchan_idx);
519 
520 		/* Mark this channel allocated */
521 		pchan->vchan = vchan;
522 		vchan->phy = pchan;
523 		dev_dbg(sdev->slave.dev, "pchan %u: alloc vchan %p\n",
524 			pchan->idx, &vchan->vc);
525 	}
526 	spin_unlock_irq(&sdev->lock);
527 
528 	for (pchan_idx = 0; pchan_idx < sdev->num_pchans; pchan_idx++) {
529 		if (!(pchan_alloc & BIT(pchan_idx)))
530 			continue;
531 
532 		pchan = sdev->pchans + pchan_idx;
533 		vchan = pchan->vchan;
534 		if (vchan) {
535 			spin_lock_irq(&vchan->vc.lock);
536 			sun6i_dma_start_desc(vchan);
537 			spin_unlock_irq(&vchan->vc.lock);
538 		}
539 	}
540 }
541 
sun6i_dma_interrupt(int irq,void * dev_id)542 static irqreturn_t sun6i_dma_interrupt(int irq, void *dev_id)
543 {
544 	struct sun6i_dma_dev *sdev = dev_id;
545 	struct sun6i_vchan *vchan;
546 	struct sun6i_pchan *pchan;
547 	int i, j, ret = IRQ_NONE;
548 	u32 status;
549 
550 	for (i = 0; i < sdev->num_pchans / DMA_IRQ_CHAN_NR; i++) {
551 		status = readl(sdev->base + DMA_IRQ_STAT(i));
552 		if (!status)
553 			continue;
554 
555 		dev_dbg(sdev->slave.dev, "DMA irq status %s: 0x%x\n",
556 			i ? "high" : "low", status);
557 
558 		writel(status, sdev->base + DMA_IRQ_STAT(i));
559 
560 		for (j = 0; (j < DMA_IRQ_CHAN_NR) && status; j++) {
561 			pchan = sdev->pchans + j;
562 			vchan = pchan->vchan;
563 			if (vchan && (status & vchan->irq_type)) {
564 				if (vchan->cyclic) {
565 					vchan_cyclic_callback(&pchan->desc->vd);
566 				} else {
567 					spin_lock(&vchan->vc.lock);
568 					vchan_cookie_complete(&pchan->desc->vd);
569 					pchan->done = pchan->desc;
570 					spin_unlock(&vchan->vc.lock);
571 				}
572 			}
573 
574 			status = status >> DMA_IRQ_CHAN_WIDTH;
575 		}
576 
577 		if (!atomic_read(&sdev->tasklet_shutdown))
578 			tasklet_schedule(&sdev->task);
579 		ret = IRQ_HANDLED;
580 	}
581 
582 	return ret;
583 }
584 
set_config(struct sun6i_dma_dev * sdev,struct dma_slave_config * sconfig,enum dma_transfer_direction direction,u32 * p_cfg)585 static int set_config(struct sun6i_dma_dev *sdev,
586 			struct dma_slave_config *sconfig,
587 			enum dma_transfer_direction direction,
588 			u32 *p_cfg)
589 {
590 	enum dma_slave_buswidth src_addr_width, dst_addr_width;
591 	u32 src_maxburst, dst_maxburst;
592 	s8 src_width, dst_width, src_burst, dst_burst;
593 
594 	src_addr_width = sconfig->src_addr_width;
595 	dst_addr_width = sconfig->dst_addr_width;
596 	src_maxburst = sconfig->src_maxburst;
597 	dst_maxburst = sconfig->dst_maxburst;
598 
599 	switch (direction) {
600 	case DMA_MEM_TO_DEV:
601 		if (src_addr_width == DMA_SLAVE_BUSWIDTH_UNDEFINED)
602 			src_addr_width = DMA_SLAVE_BUSWIDTH_4_BYTES;
603 		src_maxburst = src_maxburst ? src_maxburst : 8;
604 		break;
605 	case DMA_DEV_TO_MEM:
606 		if (dst_addr_width == DMA_SLAVE_BUSWIDTH_UNDEFINED)
607 			dst_addr_width = DMA_SLAVE_BUSWIDTH_4_BYTES;
608 		dst_maxburst = dst_maxburst ? dst_maxburst : 8;
609 		break;
610 	default:
611 		return -EINVAL;
612 	}
613 
614 	if (!(BIT(src_addr_width) & sdev->slave.src_addr_widths))
615 		return -EINVAL;
616 	if (!(BIT(dst_addr_width) & sdev->slave.dst_addr_widths))
617 		return -EINVAL;
618 	if (!(BIT(src_maxburst) & sdev->cfg->src_burst_lengths))
619 		return -EINVAL;
620 	if (!(BIT(dst_maxburst) & sdev->cfg->dst_burst_lengths))
621 		return -EINVAL;
622 
623 	src_width = convert_buswidth(src_addr_width);
624 	dst_width = convert_buswidth(dst_addr_width);
625 	dst_burst = convert_burst(dst_maxburst);
626 	src_burst = convert_burst(src_maxburst);
627 
628 	*p_cfg = DMA_CHAN_CFG_SRC_WIDTH(src_width) |
629 		DMA_CHAN_CFG_DST_WIDTH(dst_width);
630 
631 	sdev->cfg->set_burst_length(p_cfg, src_burst, dst_burst);
632 
633 	return 0;
634 }
635 
sun6i_dma_set_addr(struct sun6i_dma_dev * sdev,struct sun6i_dma_lli * v_lli,dma_addr_t src,dma_addr_t dst)636 static inline void sun6i_dma_set_addr(struct sun6i_dma_dev *sdev,
637 				      struct sun6i_dma_lli *v_lli,
638 				      dma_addr_t src, dma_addr_t dst)
639 {
640 	v_lli->src = lower_32_bits(src);
641 	v_lli->dst = lower_32_bits(dst);
642 
643 	if (sdev->cfg->has_high_addr)
644 		v_lli->para |= SRC_HIGH_ADDR(upper_32_bits(src)) |
645 			       DST_HIGH_ADDR(upper_32_bits(dst));
646 }
647 
sun6i_dma_prep_dma_memcpy(struct dma_chan * chan,dma_addr_t dest,dma_addr_t src,size_t len,unsigned long flags)648 static struct dma_async_tx_descriptor *sun6i_dma_prep_dma_memcpy(
649 		struct dma_chan *chan, dma_addr_t dest, dma_addr_t src,
650 		size_t len, unsigned long flags)
651 {
652 	struct sun6i_dma_dev *sdev = to_sun6i_dma_dev(chan->device);
653 	struct sun6i_vchan *vchan = to_sun6i_vchan(chan);
654 	struct sun6i_dma_lli *v_lli;
655 	struct sun6i_desc *txd;
656 	dma_addr_t p_lli;
657 	s8 burst, width;
658 
659 	dev_dbg(chan2dev(chan),
660 		"%s; chan: %d, dest: %pad, src: %pad, len: %zu. flags: 0x%08lx\n",
661 		__func__, vchan->vc.chan.chan_id, &dest, &src, len, flags);
662 
663 	if (!len)
664 		return NULL;
665 
666 	txd = kzalloc(sizeof(*txd), GFP_NOWAIT);
667 	if (!txd)
668 		return NULL;
669 
670 	v_lli = dma_pool_alloc(sdev->pool, GFP_DMA32 | GFP_NOWAIT, &p_lli);
671 	if (!v_lli) {
672 		dev_err(sdev->slave.dev, "Failed to alloc lli memory\n");
673 		goto err_txd_free;
674 	}
675 
676 	v_lli->len = len;
677 	v_lli->para = NORMAL_WAIT;
678 	sun6i_dma_set_addr(sdev, v_lli, src, dest);
679 
680 	burst = convert_burst(8);
681 	width = convert_buswidth(DMA_SLAVE_BUSWIDTH_4_BYTES);
682 	v_lli->cfg = DMA_CHAN_CFG_SRC_WIDTH(width) |
683 		DMA_CHAN_CFG_DST_WIDTH(width);
684 
685 	sdev->cfg->set_burst_length(&v_lli->cfg, burst, burst);
686 	sdev->cfg->set_drq(&v_lli->cfg, DRQ_SDRAM, DRQ_SDRAM);
687 	sdev->cfg->set_mode(&v_lli->cfg, LINEAR_MODE, LINEAR_MODE);
688 
689 	sun6i_dma_lli_add(NULL, v_lli, p_lli, txd);
690 
691 	sun6i_dma_dump_lli(vchan, v_lli, p_lli);
692 
693 	return vchan_tx_prep(&vchan->vc, &txd->vd, flags);
694 
695 err_txd_free:
696 	kfree(txd);
697 	return NULL;
698 }
699 
sun6i_dma_prep_slave_sg(struct dma_chan * chan,struct scatterlist * sgl,unsigned int sg_len,enum dma_transfer_direction dir,unsigned long flags,void * context)700 static struct dma_async_tx_descriptor *sun6i_dma_prep_slave_sg(
701 		struct dma_chan *chan, struct scatterlist *sgl,
702 		unsigned int sg_len, enum dma_transfer_direction dir,
703 		unsigned long flags, void *context)
704 {
705 	struct sun6i_dma_dev *sdev = to_sun6i_dma_dev(chan->device);
706 	struct sun6i_vchan *vchan = to_sun6i_vchan(chan);
707 	struct dma_slave_config *sconfig = &vchan->cfg;
708 	struct sun6i_dma_lli *v_lli, *prev = NULL;
709 	struct sun6i_desc *txd;
710 	struct scatterlist *sg;
711 	dma_addr_t p_lli;
712 	u32 lli_cfg;
713 	int i, ret;
714 
715 	if (!sgl)
716 		return NULL;
717 
718 	ret = set_config(sdev, sconfig, dir, &lli_cfg);
719 	if (ret) {
720 		dev_err(chan2dev(chan), "Invalid DMA configuration\n");
721 		return NULL;
722 	}
723 
724 	txd = kzalloc(sizeof(*txd), GFP_NOWAIT);
725 	if (!txd)
726 		return NULL;
727 
728 	for_each_sg(sgl, sg, sg_len, i) {
729 		v_lli = dma_pool_alloc(sdev->pool, GFP_DMA32 | GFP_NOWAIT, &p_lli);
730 		if (!v_lli)
731 			goto err_lli_free;
732 
733 		v_lli->len = sg_dma_len(sg);
734 		v_lli->para = NORMAL_WAIT;
735 
736 		if (dir == DMA_MEM_TO_DEV) {
737 			sun6i_dma_set_addr(sdev, v_lli,
738 					   sg_dma_address(sg),
739 					   sconfig->dst_addr);
740 			v_lli->cfg = lli_cfg;
741 			sdev->cfg->set_drq(&v_lli->cfg, DRQ_SDRAM, vchan->port);
742 			sdev->cfg->set_mode(&v_lli->cfg, LINEAR_MODE, IO_MODE);
743 
744 			dev_dbg(chan2dev(chan),
745 				"%s; chan: %d, dest: %pad, src: %pad, len: %u. flags: 0x%08lx\n",
746 				__func__, vchan->vc.chan.chan_id,
747 				&sconfig->dst_addr, &sg_dma_address(sg),
748 				sg_dma_len(sg), flags);
749 
750 		} else {
751 			sun6i_dma_set_addr(sdev, v_lli,
752 					   sconfig->src_addr,
753 					   sg_dma_address(sg));
754 			v_lli->cfg = lli_cfg;
755 			sdev->cfg->set_drq(&v_lli->cfg, vchan->port, DRQ_SDRAM);
756 			sdev->cfg->set_mode(&v_lli->cfg, IO_MODE, LINEAR_MODE);
757 
758 			dev_dbg(chan2dev(chan),
759 				"%s; chan: %d, dest: %pad, src: %pad, len: %u. flags: 0x%08lx\n",
760 				__func__, vchan->vc.chan.chan_id,
761 				&sg_dma_address(sg), &sconfig->src_addr,
762 				sg_dma_len(sg), flags);
763 		}
764 
765 		prev = sun6i_dma_lli_add(prev, v_lli, p_lli, txd);
766 	}
767 
768 	dev_dbg(chan2dev(chan), "First: %pad\n", &txd->p_lli);
769 	for (p_lli = txd->p_lli, v_lli = txd->v_lli; v_lli;
770 	     p_lli = v_lli->p_lli_next, v_lli = v_lli->v_lli_next)
771 		sun6i_dma_dump_lli(vchan, v_lli, p_lli);
772 
773 	return vchan_tx_prep(&vchan->vc, &txd->vd, flags);
774 
775 err_lli_free:
776 	for (p_lli = txd->p_lli, v_lli = txd->v_lli; v_lli;
777 	     p_lli = v_lli->p_lli_next, v_lli = v_lli->v_lli_next)
778 		dma_pool_free(sdev->pool, v_lli, p_lli);
779 	kfree(txd);
780 	return NULL;
781 }
782 
sun6i_dma_prep_dma_cyclic(struct dma_chan * chan,dma_addr_t buf_addr,size_t buf_len,size_t period_len,enum dma_transfer_direction dir,unsigned long flags)783 static struct dma_async_tx_descriptor *sun6i_dma_prep_dma_cyclic(
784 					struct dma_chan *chan,
785 					dma_addr_t buf_addr,
786 					size_t buf_len,
787 					size_t period_len,
788 					enum dma_transfer_direction dir,
789 					unsigned long flags)
790 {
791 	struct sun6i_dma_dev *sdev = to_sun6i_dma_dev(chan->device);
792 	struct sun6i_vchan *vchan = to_sun6i_vchan(chan);
793 	struct dma_slave_config *sconfig = &vchan->cfg;
794 	struct sun6i_dma_lli *v_lli, *prev = NULL;
795 	struct sun6i_desc *txd;
796 	dma_addr_t p_lli;
797 	u32 lli_cfg;
798 	unsigned int i, periods = buf_len / period_len;
799 	int ret;
800 
801 	ret = set_config(sdev, sconfig, dir, &lli_cfg);
802 	if (ret) {
803 		dev_err(chan2dev(chan), "Invalid DMA configuration\n");
804 		return NULL;
805 	}
806 
807 	txd = kzalloc(sizeof(*txd), GFP_NOWAIT);
808 	if (!txd)
809 		return NULL;
810 
811 	for (i = 0; i < periods; i++) {
812 		v_lli = dma_pool_alloc(sdev->pool, GFP_DMA32 | GFP_NOWAIT, &p_lli);
813 		if (!v_lli) {
814 			dev_err(sdev->slave.dev, "Failed to alloc lli memory\n");
815 			goto err_lli_free;
816 		}
817 
818 		v_lli->len = period_len;
819 		v_lli->para = NORMAL_WAIT;
820 
821 		if (dir == DMA_MEM_TO_DEV) {
822 			sun6i_dma_set_addr(sdev, v_lli,
823 					   buf_addr + period_len * i,
824 					   sconfig->dst_addr);
825 			v_lli->cfg = lli_cfg;
826 			sdev->cfg->set_drq(&v_lli->cfg, DRQ_SDRAM, vchan->port);
827 			sdev->cfg->set_mode(&v_lli->cfg, LINEAR_MODE, IO_MODE);
828 		} else {
829 			sun6i_dma_set_addr(sdev, v_lli,
830 					   sconfig->src_addr,
831 					   buf_addr + period_len * i);
832 			v_lli->cfg = lli_cfg;
833 			sdev->cfg->set_drq(&v_lli->cfg, vchan->port, DRQ_SDRAM);
834 			sdev->cfg->set_mode(&v_lli->cfg, IO_MODE, LINEAR_MODE);
835 		}
836 
837 		prev = sun6i_dma_lli_add(prev, v_lli, p_lli, txd);
838 	}
839 
840 	prev->p_lli_next = txd->p_lli;		/* cyclic list */
841 
842 	vchan->cyclic = true;
843 
844 	return vchan_tx_prep(&vchan->vc, &txd->vd, flags);
845 
846 err_lli_free:
847 	for (p_lli = txd->p_lli, v_lli = txd->v_lli; v_lli;
848 	     p_lli = v_lli->p_lli_next, v_lli = v_lli->v_lli_next)
849 		dma_pool_free(sdev->pool, v_lli, p_lli);
850 	kfree(txd);
851 	return NULL;
852 }
853 
sun6i_dma_config(struct dma_chan * chan,struct dma_slave_config * config)854 static int sun6i_dma_config(struct dma_chan *chan,
855 			    struct dma_slave_config *config)
856 {
857 	struct sun6i_vchan *vchan = to_sun6i_vchan(chan);
858 
859 	memcpy(&vchan->cfg, config, sizeof(*config));
860 
861 	return 0;
862 }
863 
sun6i_dma_pause(struct dma_chan * chan)864 static int sun6i_dma_pause(struct dma_chan *chan)
865 {
866 	struct sun6i_dma_dev *sdev = to_sun6i_dma_dev(chan->device);
867 	struct sun6i_vchan *vchan = to_sun6i_vchan(chan);
868 	struct sun6i_pchan *pchan = vchan->phy;
869 
870 	dev_dbg(chan2dev(chan), "vchan %p: pause\n", &vchan->vc);
871 
872 	if (pchan) {
873 		writel(DMA_CHAN_PAUSE_PAUSE,
874 		       pchan->base + DMA_CHAN_PAUSE);
875 	} else {
876 		spin_lock(&sdev->lock);
877 		list_del_init(&vchan->node);
878 		spin_unlock(&sdev->lock);
879 	}
880 
881 	return 0;
882 }
883 
sun6i_dma_resume(struct dma_chan * chan)884 static int sun6i_dma_resume(struct dma_chan *chan)
885 {
886 	struct sun6i_dma_dev *sdev = to_sun6i_dma_dev(chan->device);
887 	struct sun6i_vchan *vchan = to_sun6i_vchan(chan);
888 	struct sun6i_pchan *pchan = vchan->phy;
889 	unsigned long flags;
890 
891 	dev_dbg(chan2dev(chan), "vchan %p: resume\n", &vchan->vc);
892 
893 	spin_lock_irqsave(&vchan->vc.lock, flags);
894 
895 	if (pchan) {
896 		writel(DMA_CHAN_PAUSE_RESUME,
897 		       pchan->base + DMA_CHAN_PAUSE);
898 	} else if (!list_empty(&vchan->vc.desc_issued)) {
899 		spin_lock(&sdev->lock);
900 		list_add_tail(&vchan->node, &sdev->pending);
901 		spin_unlock(&sdev->lock);
902 	}
903 
904 	spin_unlock_irqrestore(&vchan->vc.lock, flags);
905 
906 	return 0;
907 }
908 
sun6i_dma_terminate_all(struct dma_chan * chan)909 static int sun6i_dma_terminate_all(struct dma_chan *chan)
910 {
911 	struct sun6i_dma_dev *sdev = to_sun6i_dma_dev(chan->device);
912 	struct sun6i_vchan *vchan = to_sun6i_vchan(chan);
913 	struct sun6i_pchan *pchan = vchan->phy;
914 	unsigned long flags;
915 	LIST_HEAD(head);
916 
917 	spin_lock(&sdev->lock);
918 	list_del_init(&vchan->node);
919 	spin_unlock(&sdev->lock);
920 
921 	spin_lock_irqsave(&vchan->vc.lock, flags);
922 
923 	if (vchan->cyclic) {
924 		vchan->cyclic = false;
925 		if (pchan && pchan->desc) {
926 			struct virt_dma_desc *vd = &pchan->desc->vd;
927 			struct virt_dma_chan *vc = &vchan->vc;
928 
929 			list_add_tail(&vd->node, &vc->desc_completed);
930 		}
931 	}
932 
933 	vchan_get_all_descriptors(&vchan->vc, &head);
934 
935 	if (pchan) {
936 		writel(DMA_CHAN_ENABLE_STOP, pchan->base + DMA_CHAN_ENABLE);
937 		writel(DMA_CHAN_PAUSE_RESUME, pchan->base + DMA_CHAN_PAUSE);
938 
939 		vchan->phy = NULL;
940 		pchan->vchan = NULL;
941 		pchan->desc = NULL;
942 		pchan->done = NULL;
943 	}
944 
945 	spin_unlock_irqrestore(&vchan->vc.lock, flags);
946 
947 	vchan_dma_desc_free_list(&vchan->vc, &head);
948 
949 	return 0;
950 }
951 
sun6i_dma_tx_status(struct dma_chan * chan,dma_cookie_t cookie,struct dma_tx_state * state)952 static enum dma_status sun6i_dma_tx_status(struct dma_chan *chan,
953 					   dma_cookie_t cookie,
954 					   struct dma_tx_state *state)
955 {
956 	struct sun6i_vchan *vchan = to_sun6i_vchan(chan);
957 	struct sun6i_pchan *pchan = vchan->phy;
958 	struct sun6i_dma_lli *lli;
959 	struct virt_dma_desc *vd;
960 	struct sun6i_desc *txd;
961 	enum dma_status ret;
962 	unsigned long flags;
963 	size_t bytes = 0;
964 
965 	ret = dma_cookie_status(chan, cookie, state);
966 	if (ret == DMA_COMPLETE || !state)
967 		return ret;
968 
969 	spin_lock_irqsave(&vchan->vc.lock, flags);
970 
971 	vd = vchan_find_desc(&vchan->vc, cookie);
972 	txd = to_sun6i_desc(&vd->tx);
973 
974 	if (vd) {
975 		for (lli = txd->v_lli; lli != NULL; lli = lli->v_lli_next)
976 			bytes += lli->len;
977 	} else if (!pchan || !pchan->desc) {
978 		bytes = 0;
979 	} else {
980 		bytes = sun6i_get_chan_size(pchan);
981 	}
982 
983 	spin_unlock_irqrestore(&vchan->vc.lock, flags);
984 
985 	dma_set_residue(state, bytes);
986 
987 	return ret;
988 }
989 
sun6i_dma_issue_pending(struct dma_chan * chan)990 static void sun6i_dma_issue_pending(struct dma_chan *chan)
991 {
992 	struct sun6i_dma_dev *sdev = to_sun6i_dma_dev(chan->device);
993 	struct sun6i_vchan *vchan = to_sun6i_vchan(chan);
994 	unsigned long flags;
995 
996 	spin_lock_irqsave(&vchan->vc.lock, flags);
997 
998 	if (vchan_issue_pending(&vchan->vc)) {
999 		spin_lock(&sdev->lock);
1000 
1001 		if (!vchan->phy && list_empty(&vchan->node)) {
1002 			list_add_tail(&vchan->node, &sdev->pending);
1003 			tasklet_schedule(&sdev->task);
1004 			dev_dbg(chan2dev(chan), "vchan %p: issued\n",
1005 				&vchan->vc);
1006 		}
1007 
1008 		spin_unlock(&sdev->lock);
1009 	} else {
1010 		dev_dbg(chan2dev(chan), "vchan %p: nothing to issue\n",
1011 			&vchan->vc);
1012 	}
1013 
1014 	spin_unlock_irqrestore(&vchan->vc.lock, flags);
1015 }
1016 
sun6i_dma_free_chan_resources(struct dma_chan * chan)1017 static void sun6i_dma_free_chan_resources(struct dma_chan *chan)
1018 {
1019 	struct sun6i_dma_dev *sdev = to_sun6i_dma_dev(chan->device);
1020 	struct sun6i_vchan *vchan = to_sun6i_vchan(chan);
1021 	unsigned long flags;
1022 
1023 	spin_lock_irqsave(&sdev->lock, flags);
1024 	list_del_init(&vchan->node);
1025 	spin_unlock_irqrestore(&sdev->lock, flags);
1026 
1027 	vchan_free_chan_resources(&vchan->vc);
1028 }
1029 
sun6i_dma_of_xlate(struct of_phandle_args * dma_spec,struct of_dma * ofdma)1030 static struct dma_chan *sun6i_dma_of_xlate(struct of_phandle_args *dma_spec,
1031 					   struct of_dma *ofdma)
1032 {
1033 	struct sun6i_dma_dev *sdev = ofdma->of_dma_data;
1034 	struct sun6i_vchan *vchan;
1035 	struct dma_chan *chan;
1036 	u8 port = dma_spec->args[0];
1037 
1038 	if (port > sdev->max_request)
1039 		return NULL;
1040 
1041 	chan = dma_get_any_slave_channel(&sdev->slave);
1042 	if (!chan)
1043 		return NULL;
1044 
1045 	vchan = to_sun6i_vchan(chan);
1046 	vchan->port = port;
1047 
1048 	return chan;
1049 }
1050 
sun6i_kill_tasklet(struct sun6i_dma_dev * sdev)1051 static inline void sun6i_kill_tasklet(struct sun6i_dma_dev *sdev)
1052 {
1053 	/* Disable all interrupts from DMA */
1054 	writel(0, sdev->base + DMA_IRQ_EN(0));
1055 	writel(0, sdev->base + DMA_IRQ_EN(1));
1056 
1057 	/* Prevent spurious interrupts from scheduling the tasklet */
1058 	atomic_inc(&sdev->tasklet_shutdown);
1059 
1060 	/* Make sure we won't have any further interrupts */
1061 	devm_free_irq(sdev->slave.dev, sdev->irq, sdev);
1062 
1063 	/* Actually prevent the tasklet from being scheduled */
1064 	tasklet_kill(&sdev->task);
1065 }
1066 
sun6i_dma_free(struct sun6i_dma_dev * sdev)1067 static inline void sun6i_dma_free(struct sun6i_dma_dev *sdev)
1068 {
1069 	int i;
1070 
1071 	for (i = 0; i < sdev->num_vchans; i++) {
1072 		struct sun6i_vchan *vchan = &sdev->vchans[i];
1073 
1074 		list_del(&vchan->vc.chan.device_node);
1075 		tasklet_kill(&vchan->vc.task);
1076 	}
1077 }
1078 
1079 /*
1080  * For A31:
1081  *
1082  * There's 16 physical channels that can work in parallel.
1083  *
1084  * However we have 30 different endpoints for our requests.
1085  *
1086  * Since the channels are able to handle only an unidirectional
1087  * transfer, we need to allocate more virtual channels so that
1088  * everyone can grab one channel.
1089  *
1090  * Some devices can't work in both direction (mostly because it
1091  * wouldn't make sense), so we have a bit fewer virtual channels than
1092  * 2 channels per endpoints.
1093  */
1094 
1095 static struct sun6i_dma_config sun6i_a31_dma_cfg = {
1096 	.nr_max_channels = 16,
1097 	.nr_max_requests = 30,
1098 	.nr_max_vchans   = 53,
1099 	.set_burst_length = sun6i_set_burst_length_a31,
1100 	.set_drq          = sun6i_set_drq_a31,
1101 	.set_mode         = sun6i_set_mode_a31,
1102 	.src_burst_lengths = BIT(1) | BIT(8),
1103 	.dst_burst_lengths = BIT(1) | BIT(8),
1104 	.src_addr_widths   = BIT(DMA_SLAVE_BUSWIDTH_1_BYTE) |
1105 			     BIT(DMA_SLAVE_BUSWIDTH_2_BYTES) |
1106 			     BIT(DMA_SLAVE_BUSWIDTH_4_BYTES),
1107 	.dst_addr_widths   = BIT(DMA_SLAVE_BUSWIDTH_1_BYTE) |
1108 			     BIT(DMA_SLAVE_BUSWIDTH_2_BYTES) |
1109 			     BIT(DMA_SLAVE_BUSWIDTH_4_BYTES),
1110 };
1111 
1112 /*
1113  * The A23 only has 8 physical channels, a maximum DRQ port id of 24,
1114  * and a total of 37 usable source and destination endpoints.
1115  */
1116 
1117 static struct sun6i_dma_config sun8i_a23_dma_cfg = {
1118 	.nr_max_channels = 8,
1119 	.nr_max_requests = 24,
1120 	.nr_max_vchans   = 37,
1121 	.clock_autogate_enable = sun6i_enable_clock_autogate_a23,
1122 	.set_burst_length = sun6i_set_burst_length_a31,
1123 	.set_drq          = sun6i_set_drq_a31,
1124 	.set_mode         = sun6i_set_mode_a31,
1125 	.src_burst_lengths = BIT(1) | BIT(8),
1126 	.dst_burst_lengths = BIT(1) | BIT(8),
1127 	.src_addr_widths   = BIT(DMA_SLAVE_BUSWIDTH_1_BYTE) |
1128 			     BIT(DMA_SLAVE_BUSWIDTH_2_BYTES) |
1129 			     BIT(DMA_SLAVE_BUSWIDTH_4_BYTES),
1130 	.dst_addr_widths   = BIT(DMA_SLAVE_BUSWIDTH_1_BYTE) |
1131 			     BIT(DMA_SLAVE_BUSWIDTH_2_BYTES) |
1132 			     BIT(DMA_SLAVE_BUSWIDTH_4_BYTES),
1133 };
1134 
1135 static struct sun6i_dma_config sun8i_a83t_dma_cfg = {
1136 	.nr_max_channels = 8,
1137 	.nr_max_requests = 28,
1138 	.nr_max_vchans   = 39,
1139 	.clock_autogate_enable = sun6i_enable_clock_autogate_a23,
1140 	.set_burst_length = sun6i_set_burst_length_a31,
1141 	.set_drq          = sun6i_set_drq_a31,
1142 	.set_mode         = sun6i_set_mode_a31,
1143 	.src_burst_lengths = BIT(1) | BIT(8),
1144 	.dst_burst_lengths = BIT(1) | BIT(8),
1145 	.src_addr_widths   = BIT(DMA_SLAVE_BUSWIDTH_1_BYTE) |
1146 			     BIT(DMA_SLAVE_BUSWIDTH_2_BYTES) |
1147 			     BIT(DMA_SLAVE_BUSWIDTH_4_BYTES),
1148 	.dst_addr_widths   = BIT(DMA_SLAVE_BUSWIDTH_1_BYTE) |
1149 			     BIT(DMA_SLAVE_BUSWIDTH_2_BYTES) |
1150 			     BIT(DMA_SLAVE_BUSWIDTH_4_BYTES),
1151 };
1152 
1153 /*
1154  * The H3 has 12 physical channels, a maximum DRQ port id of 27,
1155  * and a total of 34 usable source and destination endpoints.
1156  * It also supports additional burst lengths and bus widths,
1157  * and the burst length fields have different offsets.
1158  */
1159 
1160 static struct sun6i_dma_config sun8i_h3_dma_cfg = {
1161 	.nr_max_channels = 12,
1162 	.nr_max_requests = 27,
1163 	.nr_max_vchans   = 34,
1164 	.clock_autogate_enable = sun6i_enable_clock_autogate_h3,
1165 	.set_burst_length = sun6i_set_burst_length_h3,
1166 	.set_drq          = sun6i_set_drq_a31,
1167 	.set_mode         = sun6i_set_mode_a31,
1168 	.src_burst_lengths = BIT(1) | BIT(4) | BIT(8) | BIT(16),
1169 	.dst_burst_lengths = BIT(1) | BIT(4) | BIT(8) | BIT(16),
1170 	.src_addr_widths   = BIT(DMA_SLAVE_BUSWIDTH_1_BYTE) |
1171 			     BIT(DMA_SLAVE_BUSWIDTH_2_BYTES) |
1172 			     BIT(DMA_SLAVE_BUSWIDTH_4_BYTES) |
1173 			     BIT(DMA_SLAVE_BUSWIDTH_8_BYTES),
1174 	.dst_addr_widths   = BIT(DMA_SLAVE_BUSWIDTH_1_BYTE) |
1175 			     BIT(DMA_SLAVE_BUSWIDTH_2_BYTES) |
1176 			     BIT(DMA_SLAVE_BUSWIDTH_4_BYTES) |
1177 			     BIT(DMA_SLAVE_BUSWIDTH_8_BYTES),
1178 };
1179 
1180 /*
1181  * The A64 binding uses the number of dma channels from the
1182  * device tree node.
1183  */
1184 static struct sun6i_dma_config sun50i_a64_dma_cfg = {
1185 	.clock_autogate_enable = sun6i_enable_clock_autogate_h3,
1186 	.set_burst_length = sun6i_set_burst_length_h3,
1187 	.set_drq          = sun6i_set_drq_a31,
1188 	.set_mode         = sun6i_set_mode_a31,
1189 	.src_burst_lengths = BIT(1) | BIT(4) | BIT(8) | BIT(16),
1190 	.dst_burst_lengths = BIT(1) | BIT(4) | BIT(8) | BIT(16),
1191 	.src_addr_widths   = BIT(DMA_SLAVE_BUSWIDTH_1_BYTE) |
1192 			     BIT(DMA_SLAVE_BUSWIDTH_2_BYTES) |
1193 			     BIT(DMA_SLAVE_BUSWIDTH_4_BYTES) |
1194 			     BIT(DMA_SLAVE_BUSWIDTH_8_BYTES),
1195 	.dst_addr_widths   = BIT(DMA_SLAVE_BUSWIDTH_1_BYTE) |
1196 			     BIT(DMA_SLAVE_BUSWIDTH_2_BYTES) |
1197 			     BIT(DMA_SLAVE_BUSWIDTH_4_BYTES) |
1198 			     BIT(DMA_SLAVE_BUSWIDTH_8_BYTES),
1199 };
1200 
1201 /*
1202  * The A100 binding uses the number of dma channels from the
1203  * device tree node.
1204  */
1205 static struct sun6i_dma_config sun50i_a100_dma_cfg = {
1206 	.clock_autogate_enable = sun6i_enable_clock_autogate_h3,
1207 	.set_burst_length = sun6i_set_burst_length_h3,
1208 	.set_drq          = sun6i_set_drq_h6,
1209 	.set_mode         = sun6i_set_mode_h6,
1210 	.src_burst_lengths = BIT(1) | BIT(4) | BIT(8) | BIT(16),
1211 	.dst_burst_lengths = BIT(1) | BIT(4) | BIT(8) | BIT(16),
1212 	.src_addr_widths   = BIT(DMA_SLAVE_BUSWIDTH_1_BYTE) |
1213 			     BIT(DMA_SLAVE_BUSWIDTH_2_BYTES) |
1214 			     BIT(DMA_SLAVE_BUSWIDTH_4_BYTES) |
1215 			     BIT(DMA_SLAVE_BUSWIDTH_8_BYTES),
1216 	.dst_addr_widths   = BIT(DMA_SLAVE_BUSWIDTH_1_BYTE) |
1217 			     BIT(DMA_SLAVE_BUSWIDTH_2_BYTES) |
1218 			     BIT(DMA_SLAVE_BUSWIDTH_4_BYTES) |
1219 			     BIT(DMA_SLAVE_BUSWIDTH_8_BYTES),
1220 	.has_high_addr = true,
1221 	.has_mbus_clk = true,
1222 };
1223 
1224 /*
1225  * The H6 binding uses the number of dma channels from the
1226  * device tree node.
1227  */
1228 static struct sun6i_dma_config sun50i_h6_dma_cfg = {
1229 	.clock_autogate_enable = sun6i_enable_clock_autogate_h3,
1230 	.set_burst_length = sun6i_set_burst_length_h3,
1231 	.set_drq          = sun6i_set_drq_h6,
1232 	.set_mode         = sun6i_set_mode_h6,
1233 	.src_burst_lengths = BIT(1) | BIT(4) | BIT(8) | BIT(16),
1234 	.dst_burst_lengths = BIT(1) | BIT(4) | BIT(8) | BIT(16),
1235 	.src_addr_widths   = BIT(DMA_SLAVE_BUSWIDTH_1_BYTE) |
1236 			     BIT(DMA_SLAVE_BUSWIDTH_2_BYTES) |
1237 			     BIT(DMA_SLAVE_BUSWIDTH_4_BYTES) |
1238 			     BIT(DMA_SLAVE_BUSWIDTH_8_BYTES),
1239 	.dst_addr_widths   = BIT(DMA_SLAVE_BUSWIDTH_1_BYTE) |
1240 			     BIT(DMA_SLAVE_BUSWIDTH_2_BYTES) |
1241 			     BIT(DMA_SLAVE_BUSWIDTH_4_BYTES) |
1242 			     BIT(DMA_SLAVE_BUSWIDTH_8_BYTES),
1243 	.has_mbus_clk = true,
1244 };
1245 
1246 /*
1247  * The V3s have only 8 physical channels, a maximum DRQ port id of 23,
1248  * and a total of 24 usable source and destination endpoints.
1249  */
1250 
1251 static struct sun6i_dma_config sun8i_v3s_dma_cfg = {
1252 	.nr_max_channels = 8,
1253 	.nr_max_requests = 23,
1254 	.nr_max_vchans   = 24,
1255 	.clock_autogate_enable = sun6i_enable_clock_autogate_a23,
1256 	.set_burst_length = sun6i_set_burst_length_a31,
1257 	.set_drq          = sun6i_set_drq_a31,
1258 	.set_mode         = sun6i_set_mode_a31,
1259 	.src_burst_lengths = BIT(1) | BIT(8),
1260 	.dst_burst_lengths = BIT(1) | BIT(8),
1261 	.src_addr_widths   = BIT(DMA_SLAVE_BUSWIDTH_1_BYTE) |
1262 			     BIT(DMA_SLAVE_BUSWIDTH_2_BYTES) |
1263 			     BIT(DMA_SLAVE_BUSWIDTH_4_BYTES),
1264 	.dst_addr_widths   = BIT(DMA_SLAVE_BUSWIDTH_1_BYTE) |
1265 			     BIT(DMA_SLAVE_BUSWIDTH_2_BYTES) |
1266 			     BIT(DMA_SLAVE_BUSWIDTH_4_BYTES),
1267 };
1268 
1269 static const struct of_device_id sun6i_dma_match[] = {
1270 	{ .compatible = "allwinner,sun6i-a31-dma", .data = &sun6i_a31_dma_cfg },
1271 	{ .compatible = "allwinner,sun8i-a23-dma", .data = &sun8i_a23_dma_cfg },
1272 	{ .compatible = "allwinner,sun8i-a83t-dma", .data = &sun8i_a83t_dma_cfg },
1273 	{ .compatible = "allwinner,sun8i-h3-dma", .data = &sun8i_h3_dma_cfg },
1274 	{ .compatible = "allwinner,sun8i-v3s-dma", .data = &sun8i_v3s_dma_cfg },
1275 	{ .compatible = "allwinner,sun20i-d1-dma", .data = &sun50i_a100_dma_cfg },
1276 	{ .compatible = "allwinner,sun50i-a64-dma", .data = &sun50i_a64_dma_cfg },
1277 	{ .compatible = "allwinner,sun50i-a100-dma", .data = &sun50i_a100_dma_cfg },
1278 	{ .compatible = "allwinner,sun50i-h6-dma", .data = &sun50i_h6_dma_cfg },
1279 	{ /* sentinel */ }
1280 };
1281 MODULE_DEVICE_TABLE(of, sun6i_dma_match);
1282 
sun6i_dma_probe(struct platform_device * pdev)1283 static int sun6i_dma_probe(struct platform_device *pdev)
1284 {
1285 	struct device_node *np = pdev->dev.of_node;
1286 	struct sun6i_dma_dev *sdc;
1287 	int ret, i;
1288 
1289 	sdc = devm_kzalloc(&pdev->dev, sizeof(*sdc), GFP_KERNEL);
1290 	if (!sdc)
1291 		return -ENOMEM;
1292 
1293 	sdc->cfg = of_device_get_match_data(&pdev->dev);
1294 	if (!sdc->cfg)
1295 		return -ENODEV;
1296 
1297 	sdc->base = devm_platform_ioremap_resource(pdev, 0);
1298 	if (IS_ERR(sdc->base))
1299 		return PTR_ERR(sdc->base);
1300 
1301 	sdc->irq = platform_get_irq(pdev, 0);
1302 	if (sdc->irq < 0)
1303 		return sdc->irq;
1304 
1305 	sdc->clk = devm_clk_get(&pdev->dev, NULL);
1306 	if (IS_ERR(sdc->clk)) {
1307 		dev_err(&pdev->dev, "No clock specified\n");
1308 		return PTR_ERR(sdc->clk);
1309 	}
1310 
1311 	if (sdc->cfg->has_mbus_clk) {
1312 		sdc->clk_mbus = devm_clk_get(&pdev->dev, "mbus");
1313 		if (IS_ERR(sdc->clk_mbus)) {
1314 			dev_err(&pdev->dev, "No mbus clock specified\n");
1315 			return PTR_ERR(sdc->clk_mbus);
1316 		}
1317 	}
1318 
1319 	sdc->rstc = devm_reset_control_get(&pdev->dev, NULL);
1320 	if (IS_ERR(sdc->rstc)) {
1321 		dev_err(&pdev->dev, "No reset controller specified\n");
1322 		return PTR_ERR(sdc->rstc);
1323 	}
1324 
1325 	sdc->pool = dmam_pool_create(dev_name(&pdev->dev), &pdev->dev,
1326 				     sizeof(struct sun6i_dma_lli), 4, 0);
1327 	if (!sdc->pool) {
1328 		dev_err(&pdev->dev, "No memory for descriptors dma pool\n");
1329 		return -ENOMEM;
1330 	}
1331 
1332 	platform_set_drvdata(pdev, sdc);
1333 	INIT_LIST_HEAD(&sdc->pending);
1334 	spin_lock_init(&sdc->lock);
1335 
1336 	dma_set_max_seg_size(&pdev->dev, SZ_32M - 1);
1337 
1338 	dma_cap_set(DMA_PRIVATE, sdc->slave.cap_mask);
1339 	dma_cap_set(DMA_MEMCPY, sdc->slave.cap_mask);
1340 	dma_cap_set(DMA_SLAVE, sdc->slave.cap_mask);
1341 	dma_cap_set(DMA_CYCLIC, sdc->slave.cap_mask);
1342 
1343 	INIT_LIST_HEAD(&sdc->slave.channels);
1344 	sdc->slave.device_free_chan_resources	= sun6i_dma_free_chan_resources;
1345 	sdc->slave.device_tx_status		= sun6i_dma_tx_status;
1346 	sdc->slave.device_issue_pending		= sun6i_dma_issue_pending;
1347 	sdc->slave.device_prep_slave_sg		= sun6i_dma_prep_slave_sg;
1348 	sdc->slave.device_prep_dma_memcpy	= sun6i_dma_prep_dma_memcpy;
1349 	sdc->slave.device_prep_dma_cyclic	= sun6i_dma_prep_dma_cyclic;
1350 	sdc->slave.copy_align			= DMAENGINE_ALIGN_4_BYTES;
1351 	sdc->slave.device_config		= sun6i_dma_config;
1352 	sdc->slave.device_pause			= sun6i_dma_pause;
1353 	sdc->slave.device_resume		= sun6i_dma_resume;
1354 	sdc->slave.device_terminate_all		= sun6i_dma_terminate_all;
1355 	sdc->slave.src_addr_widths		= sdc->cfg->src_addr_widths;
1356 	sdc->slave.dst_addr_widths		= sdc->cfg->dst_addr_widths;
1357 	sdc->slave.directions			= BIT(DMA_DEV_TO_MEM) |
1358 						  BIT(DMA_MEM_TO_DEV);
1359 	sdc->slave.residue_granularity		= DMA_RESIDUE_GRANULARITY_BURST;
1360 	sdc->slave.dev = &pdev->dev;
1361 
1362 	sdc->num_pchans = sdc->cfg->nr_max_channels;
1363 	sdc->num_vchans = sdc->cfg->nr_max_vchans;
1364 	sdc->max_request = sdc->cfg->nr_max_requests;
1365 
1366 	ret = of_property_read_u32(np, "dma-channels", &sdc->num_pchans);
1367 	if (ret && !sdc->num_pchans) {
1368 		dev_err(&pdev->dev, "Can't get dma-channels.\n");
1369 		return ret;
1370 	}
1371 
1372 	ret = of_property_read_u32(np, "dma-requests", &sdc->max_request);
1373 	if (ret && !sdc->max_request) {
1374 		dev_info(&pdev->dev, "Missing dma-requests, using %u.\n",
1375 			 DMA_CHAN_MAX_DRQ_A31);
1376 		sdc->max_request = DMA_CHAN_MAX_DRQ_A31;
1377 	}
1378 
1379 	/*
1380 	 * If the number of vchans is not specified, derive it from the
1381 	 * highest port number, at most one channel per port and direction.
1382 	 */
1383 	if (!sdc->num_vchans)
1384 		sdc->num_vchans = 2 * (sdc->max_request + 1);
1385 
1386 	sdc->pchans = devm_kcalloc(&pdev->dev, sdc->num_pchans,
1387 				   sizeof(struct sun6i_pchan), GFP_KERNEL);
1388 	if (!sdc->pchans)
1389 		return -ENOMEM;
1390 
1391 	sdc->vchans = devm_kcalloc(&pdev->dev, sdc->num_vchans,
1392 				   sizeof(struct sun6i_vchan), GFP_KERNEL);
1393 	if (!sdc->vchans)
1394 		return -ENOMEM;
1395 
1396 	tasklet_setup(&sdc->task, sun6i_dma_tasklet);
1397 
1398 	for (i = 0; i < sdc->num_pchans; i++) {
1399 		struct sun6i_pchan *pchan = &sdc->pchans[i];
1400 
1401 		pchan->idx = i;
1402 		pchan->base = sdc->base + 0x100 + i * 0x40;
1403 	}
1404 
1405 	for (i = 0; i < sdc->num_vchans; i++) {
1406 		struct sun6i_vchan *vchan = &sdc->vchans[i];
1407 
1408 		INIT_LIST_HEAD(&vchan->node);
1409 		vchan->vc.desc_free = sun6i_dma_free_desc;
1410 		vchan_init(&vchan->vc, &sdc->slave);
1411 	}
1412 
1413 	ret = reset_control_deassert(sdc->rstc);
1414 	if (ret) {
1415 		dev_err(&pdev->dev, "Couldn't deassert the device from reset\n");
1416 		goto err_chan_free;
1417 	}
1418 
1419 	ret = clk_prepare_enable(sdc->clk);
1420 	if (ret) {
1421 		dev_err(&pdev->dev, "Couldn't enable the clock\n");
1422 		goto err_reset_assert;
1423 	}
1424 
1425 	if (sdc->cfg->has_mbus_clk) {
1426 		ret = clk_prepare_enable(sdc->clk_mbus);
1427 		if (ret) {
1428 			dev_err(&pdev->dev, "Couldn't enable mbus clock\n");
1429 			goto err_clk_disable;
1430 		}
1431 	}
1432 
1433 	ret = devm_request_irq(&pdev->dev, sdc->irq, sun6i_dma_interrupt, 0,
1434 			       dev_name(&pdev->dev), sdc);
1435 	if (ret) {
1436 		dev_err(&pdev->dev, "Cannot request IRQ\n");
1437 		goto err_mbus_clk_disable;
1438 	}
1439 
1440 	ret = dma_async_device_register(&sdc->slave);
1441 	if (ret) {
1442 		dev_warn(&pdev->dev, "Failed to register DMA engine device\n");
1443 		goto err_irq_disable;
1444 	}
1445 
1446 	ret = of_dma_controller_register(pdev->dev.of_node, sun6i_dma_of_xlate,
1447 					 sdc);
1448 	if (ret) {
1449 		dev_err(&pdev->dev, "of_dma_controller_register failed\n");
1450 		goto err_dma_unregister;
1451 	}
1452 
1453 	if (sdc->cfg->clock_autogate_enable)
1454 		sdc->cfg->clock_autogate_enable(sdc);
1455 
1456 	return 0;
1457 
1458 err_dma_unregister:
1459 	dma_async_device_unregister(&sdc->slave);
1460 err_irq_disable:
1461 	sun6i_kill_tasklet(sdc);
1462 err_mbus_clk_disable:
1463 	clk_disable_unprepare(sdc->clk_mbus);
1464 err_clk_disable:
1465 	clk_disable_unprepare(sdc->clk);
1466 err_reset_assert:
1467 	reset_control_assert(sdc->rstc);
1468 err_chan_free:
1469 	sun6i_dma_free(sdc);
1470 	return ret;
1471 }
1472 
sun6i_dma_remove(struct platform_device * pdev)1473 static void sun6i_dma_remove(struct platform_device *pdev)
1474 {
1475 	struct sun6i_dma_dev *sdc = platform_get_drvdata(pdev);
1476 
1477 	of_dma_controller_free(pdev->dev.of_node);
1478 	dma_async_device_unregister(&sdc->slave);
1479 
1480 	sun6i_kill_tasklet(sdc);
1481 
1482 	clk_disable_unprepare(sdc->clk_mbus);
1483 	clk_disable_unprepare(sdc->clk);
1484 	reset_control_assert(sdc->rstc);
1485 
1486 	sun6i_dma_free(sdc);
1487 }
1488 
1489 static struct platform_driver sun6i_dma_driver = {
1490 	.probe		= sun6i_dma_probe,
1491 	.remove_new	= sun6i_dma_remove,
1492 	.driver = {
1493 		.name		= "sun6i-dma",
1494 		.of_match_table	= sun6i_dma_match,
1495 	},
1496 };
1497 module_platform_driver(sun6i_dma_driver);
1498 
1499 MODULE_DESCRIPTION("Allwinner A31 DMA Controller Driver");
1500 MODULE_AUTHOR("Sugar <shuge@allwinnertech.com>");
1501 MODULE_AUTHOR("Maxime Ripard <maxime.ripard@free-electrons.com>");
1502 MODULE_LICENSE("GPL");
1503