1 // SPDX-License-Identifier: GPL-2.0-or-later
2 /*
3 * DMA driver for Xilinx ZynqMP DMA Engine
4 *
5 * Copyright (C) 2016 Xilinx, Inc. All rights reserved.
6 */
7
8 #include <linux/bitops.h>
9 #include <linux/dma-mapping.h>
10 #include <linux/init.h>
11 #include <linux/interrupt.h>
12 #include <linux/io.h>
13 #include <linux/module.h>
14 #include <linux/of.h>
15 #include <linux/of_dma.h>
16 #include <linux/platform_device.h>
17 #include <linux/slab.h>
18 #include <linux/clk.h>
19 #include <linux/io-64-nonatomic-lo-hi.h>
20 #include <linux/pm_runtime.h>
21
22 #include "../dmaengine.h"
23
24 /* Register Offsets */
25 #define ZYNQMP_DMA_ISR 0x100
26 #define ZYNQMP_DMA_IMR 0x104
27 #define ZYNQMP_DMA_IER 0x108
28 #define ZYNQMP_DMA_IDS 0x10C
29 #define ZYNQMP_DMA_CTRL0 0x110
30 #define ZYNQMP_DMA_CTRL1 0x114
31 #define ZYNQMP_DMA_DATA_ATTR 0x120
32 #define ZYNQMP_DMA_DSCR_ATTR 0x124
33 #define ZYNQMP_DMA_SRC_DSCR_WRD0 0x128
34 #define ZYNQMP_DMA_SRC_DSCR_WRD1 0x12C
35 #define ZYNQMP_DMA_SRC_DSCR_WRD2 0x130
36 #define ZYNQMP_DMA_SRC_DSCR_WRD3 0x134
37 #define ZYNQMP_DMA_DST_DSCR_WRD0 0x138
38 #define ZYNQMP_DMA_DST_DSCR_WRD1 0x13C
39 #define ZYNQMP_DMA_DST_DSCR_WRD2 0x140
40 #define ZYNQMP_DMA_DST_DSCR_WRD3 0x144
41 #define ZYNQMP_DMA_SRC_START_LSB 0x158
42 #define ZYNQMP_DMA_SRC_START_MSB 0x15C
43 #define ZYNQMP_DMA_DST_START_LSB 0x160
44 #define ZYNQMP_DMA_DST_START_MSB 0x164
45 #define ZYNQMP_DMA_TOTAL_BYTE 0x188
46 #define ZYNQMP_DMA_RATE_CTRL 0x18C
47 #define ZYNQMP_DMA_IRQ_SRC_ACCT 0x190
48 #define ZYNQMP_DMA_IRQ_DST_ACCT 0x194
49 #define ZYNQMP_DMA_CTRL2 0x200
50
51 /* Interrupt registers bit field definitions */
52 #define ZYNQMP_DMA_DONE BIT(10)
53 #define ZYNQMP_DMA_AXI_WR_DATA BIT(9)
54 #define ZYNQMP_DMA_AXI_RD_DATA BIT(8)
55 #define ZYNQMP_DMA_AXI_RD_DST_DSCR BIT(7)
56 #define ZYNQMP_DMA_AXI_RD_SRC_DSCR BIT(6)
57 #define ZYNQMP_DMA_IRQ_DST_ACCT_ERR BIT(5)
58 #define ZYNQMP_DMA_IRQ_SRC_ACCT_ERR BIT(4)
59 #define ZYNQMP_DMA_BYTE_CNT_OVRFL BIT(3)
60 #define ZYNQMP_DMA_DST_DSCR_DONE BIT(2)
61 #define ZYNQMP_DMA_INV_APB BIT(0)
62
63 /* Control 0 register bit field definitions */
64 #define ZYNQMP_DMA_OVR_FETCH BIT(7)
65 #define ZYNQMP_DMA_POINT_TYPE_SG BIT(6)
66 #define ZYNQMP_DMA_RATE_CTRL_EN BIT(3)
67
68 /* Control 1 register bit field definitions */
69 #define ZYNQMP_DMA_SRC_ISSUE GENMASK(4, 0)
70
71 /* Data Attribute register bit field definitions */
72 #define ZYNQMP_DMA_ARBURST GENMASK(27, 26)
73 #define ZYNQMP_DMA_ARCACHE GENMASK(25, 22)
74 #define ZYNQMP_DMA_ARCACHE_OFST 22
75 #define ZYNQMP_DMA_ARQOS GENMASK(21, 18)
76 #define ZYNQMP_DMA_ARQOS_OFST 18
77 #define ZYNQMP_DMA_ARLEN GENMASK(17, 14)
78 #define ZYNQMP_DMA_ARLEN_OFST 14
79 #define ZYNQMP_DMA_AWBURST GENMASK(13, 12)
80 #define ZYNQMP_DMA_AWCACHE GENMASK(11, 8)
81 #define ZYNQMP_DMA_AWCACHE_OFST 8
82 #define ZYNQMP_DMA_AWQOS GENMASK(7, 4)
83 #define ZYNQMP_DMA_AWQOS_OFST 4
84 #define ZYNQMP_DMA_AWLEN GENMASK(3, 0)
85 #define ZYNQMP_DMA_AWLEN_OFST 0
86
87 /* Descriptor Attribute register bit field definitions */
88 #define ZYNQMP_DMA_AXCOHRNT BIT(8)
89 #define ZYNQMP_DMA_AXCACHE GENMASK(7, 4)
90 #define ZYNQMP_DMA_AXCACHE_OFST 4
91 #define ZYNQMP_DMA_AXQOS GENMASK(3, 0)
92 #define ZYNQMP_DMA_AXQOS_OFST 0
93
94 /* Control register 2 bit field definitions */
95 #define ZYNQMP_DMA_ENABLE BIT(0)
96
97 /* Buffer Descriptor definitions */
98 #define ZYNQMP_DMA_DESC_CTRL_STOP 0x10
99 #define ZYNQMP_DMA_DESC_CTRL_COMP_INT 0x4
100 #define ZYNQMP_DMA_DESC_CTRL_SIZE_256 0x2
101 #define ZYNQMP_DMA_DESC_CTRL_COHRNT 0x1
102
103 /* Interrupt Mask specific definitions */
104 #define ZYNQMP_DMA_INT_ERR (ZYNQMP_DMA_AXI_RD_DATA | \
105 ZYNQMP_DMA_AXI_WR_DATA | \
106 ZYNQMP_DMA_AXI_RD_DST_DSCR | \
107 ZYNQMP_DMA_AXI_RD_SRC_DSCR | \
108 ZYNQMP_DMA_INV_APB)
109 #define ZYNQMP_DMA_INT_OVRFL (ZYNQMP_DMA_BYTE_CNT_OVRFL | \
110 ZYNQMP_DMA_IRQ_SRC_ACCT_ERR | \
111 ZYNQMP_DMA_IRQ_DST_ACCT_ERR)
112 #define ZYNQMP_DMA_INT_DONE (ZYNQMP_DMA_DONE | ZYNQMP_DMA_DST_DSCR_DONE)
113 #define ZYNQMP_DMA_INT_EN_DEFAULT_MASK (ZYNQMP_DMA_INT_DONE | \
114 ZYNQMP_DMA_INT_ERR | \
115 ZYNQMP_DMA_INT_OVRFL | \
116 ZYNQMP_DMA_DST_DSCR_DONE)
117
118 /* Max number of descriptors per channel */
119 #define ZYNQMP_DMA_NUM_DESCS 32
120
121 /* Max transfer size per descriptor */
122 #define ZYNQMP_DMA_MAX_TRANS_LEN 0x40000000
123
124 /* Max burst lengths */
125 #define ZYNQMP_DMA_MAX_DST_BURST_LEN 32768U
126 #define ZYNQMP_DMA_MAX_SRC_BURST_LEN 32768U
127
128 /* Reset values for data attributes */
129 #define ZYNQMP_DMA_AXCACHE_VAL 0xF
130
131 #define ZYNQMP_DMA_SRC_ISSUE_RST_VAL 0x1F
132
133 #define ZYNQMP_DMA_IDS_DEFAULT_MASK 0xFFF
134
135 /* Bus width in bits */
136 #define ZYNQMP_DMA_BUS_WIDTH_64 64
137 #define ZYNQMP_DMA_BUS_WIDTH_128 128
138
139 #define ZDMA_PM_TIMEOUT 100
140
141 #define ZYNQMP_DMA_DESC_SIZE(chan) (chan->desc_size)
142
143 #define to_chan(chan) container_of(chan, struct zynqmp_dma_chan, \
144 common)
145 #define tx_to_desc(tx) container_of(tx, struct zynqmp_dma_desc_sw, \
146 async_tx)
147
148 /**
149 * struct zynqmp_dma_desc_ll - Hw linked list descriptor
150 * @addr: Buffer address
151 * @size: Size of the buffer
152 * @ctrl: Control word
153 * @nxtdscraddr: Next descriptor base address
154 * @rsvd: Reserved field and for Hw internal use.
155 */
156 struct zynqmp_dma_desc_ll {
157 u64 addr;
158 u32 size;
159 u32 ctrl;
160 u64 nxtdscraddr;
161 u64 rsvd;
162 };
163
164 /**
165 * struct zynqmp_dma_desc_sw - Per Transaction structure
166 * @src: Source address for simple mode dma
167 * @dst: Destination address for simple mode dma
168 * @len: Transfer length for simple mode dma
169 * @node: Node in the channel descriptor list
170 * @tx_list: List head for the current transfer
171 * @async_tx: Async transaction descriptor
172 * @src_v: Virtual address of the src descriptor
173 * @src_p: Physical address of the src descriptor
174 * @dst_v: Virtual address of the dst descriptor
175 * @dst_p: Physical address of the dst descriptor
176 */
177 struct zynqmp_dma_desc_sw {
178 u64 src;
179 u64 dst;
180 u32 len;
181 struct list_head node;
182 struct list_head tx_list;
183 struct dma_async_tx_descriptor async_tx;
184 struct zynqmp_dma_desc_ll *src_v;
185 dma_addr_t src_p;
186 struct zynqmp_dma_desc_ll *dst_v;
187 dma_addr_t dst_p;
188 };
189
190 /**
191 * struct zynqmp_dma_chan - Driver specific DMA channel structure
192 * @zdev: Driver specific device structure
193 * @regs: Control registers offset
194 * @lock: Descriptor operation lock
195 * @pending_list: Descriptors waiting
196 * @free_list: Descriptors free
197 * @active_list: Descriptors active
198 * @sw_desc_pool: SW descriptor pool
199 * @done_list: Complete descriptors
200 * @common: DMA common channel
201 * @desc_pool_v: Statically allocated descriptor base
202 * @desc_pool_p: Physical allocated descriptor base
203 * @desc_free_cnt: Descriptor available count
204 * @dev: The dma device
205 * @irq: Channel IRQ
206 * @is_dmacoherent: Tells whether dma operations are coherent or not
207 * @tasklet: Cleanup work after irq
208 * @idle : Channel status;
209 * @desc_size: Size of the low level descriptor
210 * @err: Channel has errors
211 * @bus_width: Bus width
212 * @src_burst_len: Source burst length
213 * @dst_burst_len: Dest burst length
214 */
215 struct zynqmp_dma_chan {
216 struct zynqmp_dma_device *zdev;
217 void __iomem *regs;
218 spinlock_t lock;
219 struct list_head pending_list;
220 struct list_head free_list;
221 struct list_head active_list;
222 struct zynqmp_dma_desc_sw *sw_desc_pool;
223 struct list_head done_list;
224 struct dma_chan common;
225 void *desc_pool_v;
226 dma_addr_t desc_pool_p;
227 u32 desc_free_cnt;
228 struct device *dev;
229 int irq;
230 bool is_dmacoherent;
231 struct tasklet_struct tasklet;
232 bool idle;
233 size_t desc_size;
234 bool err;
235 u32 bus_width;
236 u32 src_burst_len;
237 u32 dst_burst_len;
238 };
239
240 /**
241 * struct zynqmp_dma_device - DMA device structure
242 * @dev: Device Structure
243 * @common: DMA device structure
244 * @chan: Driver specific DMA channel
245 * @clk_main: Pointer to main clock
246 * @clk_apb: Pointer to apb clock
247 */
248 struct zynqmp_dma_device {
249 struct device *dev;
250 struct dma_device common;
251 struct zynqmp_dma_chan *chan;
252 struct clk *clk_main;
253 struct clk *clk_apb;
254 };
255
zynqmp_dma_writeq(struct zynqmp_dma_chan * chan,u32 reg,u64 value)256 static inline void zynqmp_dma_writeq(struct zynqmp_dma_chan *chan, u32 reg,
257 u64 value)
258 {
259 lo_hi_writeq(value, chan->regs + reg);
260 }
261
262 /**
263 * zynqmp_dma_update_desc_to_ctrlr - Updates descriptor to the controller
264 * @chan: ZynqMP DMA DMA channel pointer
265 * @desc: Transaction descriptor pointer
266 */
zynqmp_dma_update_desc_to_ctrlr(struct zynqmp_dma_chan * chan,struct zynqmp_dma_desc_sw * desc)267 static void zynqmp_dma_update_desc_to_ctrlr(struct zynqmp_dma_chan *chan,
268 struct zynqmp_dma_desc_sw *desc)
269 {
270 dma_addr_t addr;
271
272 addr = desc->src_p;
273 zynqmp_dma_writeq(chan, ZYNQMP_DMA_SRC_START_LSB, addr);
274 addr = desc->dst_p;
275 zynqmp_dma_writeq(chan, ZYNQMP_DMA_DST_START_LSB, addr);
276 }
277
278 /**
279 * zynqmp_dma_desc_config_eod - Mark the descriptor as end descriptor
280 * @chan: ZynqMP DMA channel pointer
281 * @desc: Hw descriptor pointer
282 */
zynqmp_dma_desc_config_eod(struct zynqmp_dma_chan * chan,void * desc)283 static void zynqmp_dma_desc_config_eod(struct zynqmp_dma_chan *chan,
284 void *desc)
285 {
286 struct zynqmp_dma_desc_ll *hw = (struct zynqmp_dma_desc_ll *)desc;
287
288 hw->ctrl |= ZYNQMP_DMA_DESC_CTRL_STOP;
289 hw++;
290 hw->ctrl |= ZYNQMP_DMA_DESC_CTRL_COMP_INT | ZYNQMP_DMA_DESC_CTRL_STOP;
291 }
292
293 /**
294 * zynqmp_dma_config_sg_ll_desc - Configure the linked list descriptor
295 * @chan: ZynqMP DMA channel pointer
296 * @sdesc: Hw descriptor pointer
297 * @src: Source buffer address
298 * @dst: Destination buffer address
299 * @len: Transfer length
300 * @prev: Previous hw descriptor pointer
301 */
zynqmp_dma_config_sg_ll_desc(struct zynqmp_dma_chan * chan,struct zynqmp_dma_desc_ll * sdesc,dma_addr_t src,dma_addr_t dst,size_t len,struct zynqmp_dma_desc_ll * prev)302 static void zynqmp_dma_config_sg_ll_desc(struct zynqmp_dma_chan *chan,
303 struct zynqmp_dma_desc_ll *sdesc,
304 dma_addr_t src, dma_addr_t dst, size_t len,
305 struct zynqmp_dma_desc_ll *prev)
306 {
307 struct zynqmp_dma_desc_ll *ddesc = sdesc + 1;
308
309 sdesc->size = ddesc->size = len;
310 sdesc->addr = src;
311 ddesc->addr = dst;
312
313 sdesc->ctrl = ddesc->ctrl = ZYNQMP_DMA_DESC_CTRL_SIZE_256;
314 if (chan->is_dmacoherent) {
315 sdesc->ctrl |= ZYNQMP_DMA_DESC_CTRL_COHRNT;
316 ddesc->ctrl |= ZYNQMP_DMA_DESC_CTRL_COHRNT;
317 }
318
319 if (prev) {
320 dma_addr_t addr = chan->desc_pool_p +
321 ((uintptr_t)sdesc - (uintptr_t)chan->desc_pool_v);
322 ddesc = prev + 1;
323 prev->nxtdscraddr = addr;
324 ddesc->nxtdscraddr = addr + ZYNQMP_DMA_DESC_SIZE(chan);
325 }
326 }
327
328 /**
329 * zynqmp_dma_init - Initialize the channel
330 * @chan: ZynqMP DMA channel pointer
331 */
zynqmp_dma_init(struct zynqmp_dma_chan * chan)332 static void zynqmp_dma_init(struct zynqmp_dma_chan *chan)
333 {
334 u32 val;
335
336 writel(ZYNQMP_DMA_IDS_DEFAULT_MASK, chan->regs + ZYNQMP_DMA_IDS);
337 val = readl(chan->regs + ZYNQMP_DMA_ISR);
338 writel(val, chan->regs + ZYNQMP_DMA_ISR);
339
340 if (chan->is_dmacoherent) {
341 val = ZYNQMP_DMA_AXCOHRNT;
342 val = (val & ~ZYNQMP_DMA_AXCACHE) |
343 (ZYNQMP_DMA_AXCACHE_VAL << ZYNQMP_DMA_AXCACHE_OFST);
344 writel(val, chan->regs + ZYNQMP_DMA_DSCR_ATTR);
345 }
346
347 val = readl(chan->regs + ZYNQMP_DMA_DATA_ATTR);
348 if (chan->is_dmacoherent) {
349 val = (val & ~ZYNQMP_DMA_ARCACHE) |
350 (ZYNQMP_DMA_AXCACHE_VAL << ZYNQMP_DMA_ARCACHE_OFST);
351 val = (val & ~ZYNQMP_DMA_AWCACHE) |
352 (ZYNQMP_DMA_AXCACHE_VAL << ZYNQMP_DMA_AWCACHE_OFST);
353 }
354 writel(val, chan->regs + ZYNQMP_DMA_DATA_ATTR);
355
356 /* Clearing the interrupt account rgisters */
357 val = readl(chan->regs + ZYNQMP_DMA_IRQ_SRC_ACCT);
358 val = readl(chan->regs + ZYNQMP_DMA_IRQ_DST_ACCT);
359
360 chan->idle = true;
361 }
362
363 /**
364 * zynqmp_dma_tx_submit - Submit DMA transaction
365 * @tx: Async transaction descriptor pointer
366 *
367 * Return: cookie value
368 */
zynqmp_dma_tx_submit(struct dma_async_tx_descriptor * tx)369 static dma_cookie_t zynqmp_dma_tx_submit(struct dma_async_tx_descriptor *tx)
370 {
371 struct zynqmp_dma_chan *chan = to_chan(tx->chan);
372 struct zynqmp_dma_desc_sw *desc, *new;
373 dma_cookie_t cookie;
374 unsigned long irqflags;
375
376 new = tx_to_desc(tx);
377 spin_lock_irqsave(&chan->lock, irqflags);
378 cookie = dma_cookie_assign(tx);
379
380 if (!list_empty(&chan->pending_list)) {
381 desc = list_last_entry(&chan->pending_list,
382 struct zynqmp_dma_desc_sw, node);
383 if (!list_empty(&desc->tx_list))
384 desc = list_last_entry(&desc->tx_list,
385 struct zynqmp_dma_desc_sw, node);
386 desc->src_v->nxtdscraddr = new->src_p;
387 desc->src_v->ctrl &= ~ZYNQMP_DMA_DESC_CTRL_STOP;
388 desc->dst_v->nxtdscraddr = new->dst_p;
389 desc->dst_v->ctrl &= ~ZYNQMP_DMA_DESC_CTRL_STOP;
390 }
391
392 list_add_tail(&new->node, &chan->pending_list);
393 spin_unlock_irqrestore(&chan->lock, irqflags);
394
395 return cookie;
396 }
397
398 /**
399 * zynqmp_dma_get_descriptor - Get the sw descriptor from the pool
400 * @chan: ZynqMP DMA channel pointer
401 *
402 * Return: The sw descriptor
403 */
404 static struct zynqmp_dma_desc_sw *
zynqmp_dma_get_descriptor(struct zynqmp_dma_chan * chan)405 zynqmp_dma_get_descriptor(struct zynqmp_dma_chan *chan)
406 {
407 struct zynqmp_dma_desc_sw *desc;
408 unsigned long irqflags;
409
410 spin_lock_irqsave(&chan->lock, irqflags);
411 desc = list_first_entry(&chan->free_list,
412 struct zynqmp_dma_desc_sw, node);
413 list_del(&desc->node);
414 spin_unlock_irqrestore(&chan->lock, irqflags);
415
416 INIT_LIST_HEAD(&desc->tx_list);
417 /* Clear the src and dst descriptor memory */
418 memset((void *)desc->src_v, 0, ZYNQMP_DMA_DESC_SIZE(chan));
419 memset((void *)desc->dst_v, 0, ZYNQMP_DMA_DESC_SIZE(chan));
420
421 return desc;
422 }
423
424 /**
425 * zynqmp_dma_free_descriptor - Issue pending transactions
426 * @chan: ZynqMP DMA channel pointer
427 * @sdesc: Transaction descriptor pointer
428 */
zynqmp_dma_free_descriptor(struct zynqmp_dma_chan * chan,struct zynqmp_dma_desc_sw * sdesc)429 static void zynqmp_dma_free_descriptor(struct zynqmp_dma_chan *chan,
430 struct zynqmp_dma_desc_sw *sdesc)
431 {
432 struct zynqmp_dma_desc_sw *child, *next;
433
434 chan->desc_free_cnt++;
435 list_move_tail(&sdesc->node, &chan->free_list);
436 list_for_each_entry_safe(child, next, &sdesc->tx_list, node) {
437 chan->desc_free_cnt++;
438 list_move_tail(&child->node, &chan->free_list);
439 }
440 }
441
442 /**
443 * zynqmp_dma_free_desc_list - Free descriptors list
444 * @chan: ZynqMP DMA channel pointer
445 * @list: List to parse and delete the descriptor
446 */
zynqmp_dma_free_desc_list(struct zynqmp_dma_chan * chan,struct list_head * list)447 static void zynqmp_dma_free_desc_list(struct zynqmp_dma_chan *chan,
448 struct list_head *list)
449 {
450 struct zynqmp_dma_desc_sw *desc, *next;
451
452 list_for_each_entry_safe(desc, next, list, node)
453 zynqmp_dma_free_descriptor(chan, desc);
454 }
455
456 /**
457 * zynqmp_dma_alloc_chan_resources - Allocate channel resources
458 * @dchan: DMA channel
459 *
460 * Return: Number of descriptors on success and failure value on error
461 */
zynqmp_dma_alloc_chan_resources(struct dma_chan * dchan)462 static int zynqmp_dma_alloc_chan_resources(struct dma_chan *dchan)
463 {
464 struct zynqmp_dma_chan *chan = to_chan(dchan);
465 struct zynqmp_dma_desc_sw *desc;
466 int i, ret;
467
468 ret = pm_runtime_resume_and_get(chan->dev);
469 if (ret < 0)
470 return ret;
471
472 chan->sw_desc_pool = kcalloc(ZYNQMP_DMA_NUM_DESCS, sizeof(*desc),
473 GFP_KERNEL);
474 if (!chan->sw_desc_pool)
475 return -ENOMEM;
476
477 chan->idle = true;
478 chan->desc_free_cnt = ZYNQMP_DMA_NUM_DESCS;
479
480 INIT_LIST_HEAD(&chan->free_list);
481
482 for (i = 0; i < ZYNQMP_DMA_NUM_DESCS; i++) {
483 desc = chan->sw_desc_pool + i;
484 dma_async_tx_descriptor_init(&desc->async_tx, &chan->common);
485 desc->async_tx.tx_submit = zynqmp_dma_tx_submit;
486 list_add_tail(&desc->node, &chan->free_list);
487 }
488
489 chan->desc_pool_v = dma_alloc_coherent(chan->dev,
490 (2 * ZYNQMP_DMA_DESC_SIZE(chan) *
491 ZYNQMP_DMA_NUM_DESCS),
492 &chan->desc_pool_p, GFP_KERNEL);
493 if (!chan->desc_pool_v)
494 return -ENOMEM;
495
496 for (i = 0; i < ZYNQMP_DMA_NUM_DESCS; i++) {
497 desc = chan->sw_desc_pool + i;
498 desc->src_v = (struct zynqmp_dma_desc_ll *) (chan->desc_pool_v +
499 (i * ZYNQMP_DMA_DESC_SIZE(chan) * 2));
500 desc->dst_v = (struct zynqmp_dma_desc_ll *) (desc->src_v + 1);
501 desc->src_p = chan->desc_pool_p +
502 (i * ZYNQMP_DMA_DESC_SIZE(chan) * 2);
503 desc->dst_p = desc->src_p + ZYNQMP_DMA_DESC_SIZE(chan);
504 }
505
506 return ZYNQMP_DMA_NUM_DESCS;
507 }
508
509 /**
510 * zynqmp_dma_start - Start DMA channel
511 * @chan: ZynqMP DMA channel pointer
512 */
zynqmp_dma_start(struct zynqmp_dma_chan * chan)513 static void zynqmp_dma_start(struct zynqmp_dma_chan *chan)
514 {
515 writel(ZYNQMP_DMA_INT_EN_DEFAULT_MASK, chan->regs + ZYNQMP_DMA_IER);
516 writel(0, chan->regs + ZYNQMP_DMA_TOTAL_BYTE);
517 chan->idle = false;
518 writel(ZYNQMP_DMA_ENABLE, chan->regs + ZYNQMP_DMA_CTRL2);
519 }
520
521 /**
522 * zynqmp_dma_handle_ovfl_int - Process the overflow interrupt
523 * @chan: ZynqMP DMA channel pointer
524 * @status: Interrupt status value
525 */
zynqmp_dma_handle_ovfl_int(struct zynqmp_dma_chan * chan,u32 status)526 static void zynqmp_dma_handle_ovfl_int(struct zynqmp_dma_chan *chan, u32 status)
527 {
528 if (status & ZYNQMP_DMA_BYTE_CNT_OVRFL)
529 writel(0, chan->regs + ZYNQMP_DMA_TOTAL_BYTE);
530 if (status & ZYNQMP_DMA_IRQ_DST_ACCT_ERR)
531 readl(chan->regs + ZYNQMP_DMA_IRQ_DST_ACCT);
532 if (status & ZYNQMP_DMA_IRQ_SRC_ACCT_ERR)
533 readl(chan->regs + ZYNQMP_DMA_IRQ_SRC_ACCT);
534 }
535
zynqmp_dma_config(struct zynqmp_dma_chan * chan)536 static void zynqmp_dma_config(struct zynqmp_dma_chan *chan)
537 {
538 u32 val, burst_val;
539
540 val = readl(chan->regs + ZYNQMP_DMA_CTRL0);
541 val |= ZYNQMP_DMA_POINT_TYPE_SG;
542 writel(val, chan->regs + ZYNQMP_DMA_CTRL0);
543
544 val = readl(chan->regs + ZYNQMP_DMA_DATA_ATTR);
545 burst_val = __ilog2_u32(chan->src_burst_len);
546 val = (val & ~ZYNQMP_DMA_ARLEN) |
547 ((burst_val << ZYNQMP_DMA_ARLEN_OFST) & ZYNQMP_DMA_ARLEN);
548 burst_val = __ilog2_u32(chan->dst_burst_len);
549 val = (val & ~ZYNQMP_DMA_AWLEN) |
550 ((burst_val << ZYNQMP_DMA_AWLEN_OFST) & ZYNQMP_DMA_AWLEN);
551 writel(val, chan->regs + ZYNQMP_DMA_DATA_ATTR);
552 }
553
554 /**
555 * zynqmp_dma_device_config - Zynqmp dma device configuration
556 * @dchan: DMA channel
557 * @config: DMA device config
558 *
559 * Return: 0 always
560 */
zynqmp_dma_device_config(struct dma_chan * dchan,struct dma_slave_config * config)561 static int zynqmp_dma_device_config(struct dma_chan *dchan,
562 struct dma_slave_config *config)
563 {
564 struct zynqmp_dma_chan *chan = to_chan(dchan);
565
566 chan->src_burst_len = clamp(config->src_maxburst, 1U,
567 ZYNQMP_DMA_MAX_SRC_BURST_LEN);
568 chan->dst_burst_len = clamp(config->dst_maxburst, 1U,
569 ZYNQMP_DMA_MAX_DST_BURST_LEN);
570
571 return 0;
572 }
573
574 /**
575 * zynqmp_dma_start_transfer - Initiate the new transfer
576 * @chan: ZynqMP DMA channel pointer
577 */
zynqmp_dma_start_transfer(struct zynqmp_dma_chan * chan)578 static void zynqmp_dma_start_transfer(struct zynqmp_dma_chan *chan)
579 {
580 struct zynqmp_dma_desc_sw *desc;
581
582 if (!chan->idle)
583 return;
584
585 zynqmp_dma_config(chan);
586
587 desc = list_first_entry_or_null(&chan->pending_list,
588 struct zynqmp_dma_desc_sw, node);
589 if (!desc)
590 return;
591
592 list_splice_tail_init(&chan->pending_list, &chan->active_list);
593 zynqmp_dma_update_desc_to_ctrlr(chan, desc);
594 zynqmp_dma_start(chan);
595 }
596
597
598 /**
599 * zynqmp_dma_chan_desc_cleanup - Cleanup the completed descriptors
600 * @chan: ZynqMP DMA channel
601 */
zynqmp_dma_chan_desc_cleanup(struct zynqmp_dma_chan * chan)602 static void zynqmp_dma_chan_desc_cleanup(struct zynqmp_dma_chan *chan)
603 {
604 struct zynqmp_dma_desc_sw *desc, *next;
605 unsigned long irqflags;
606
607 spin_lock_irqsave(&chan->lock, irqflags);
608
609 list_for_each_entry_safe(desc, next, &chan->done_list, node) {
610 struct dmaengine_desc_callback cb;
611
612 dmaengine_desc_get_callback(&desc->async_tx, &cb);
613 if (dmaengine_desc_callback_valid(&cb)) {
614 spin_unlock_irqrestore(&chan->lock, irqflags);
615 dmaengine_desc_callback_invoke(&cb, NULL);
616 spin_lock_irqsave(&chan->lock, irqflags);
617 }
618
619 /* Run any dependencies, then free the descriptor */
620 zynqmp_dma_free_descriptor(chan, desc);
621 }
622
623 spin_unlock_irqrestore(&chan->lock, irqflags);
624 }
625
626 /**
627 * zynqmp_dma_complete_descriptor - Mark the active descriptor as complete
628 * @chan: ZynqMP DMA channel pointer
629 */
zynqmp_dma_complete_descriptor(struct zynqmp_dma_chan * chan)630 static void zynqmp_dma_complete_descriptor(struct zynqmp_dma_chan *chan)
631 {
632 struct zynqmp_dma_desc_sw *desc;
633
634 desc = list_first_entry_or_null(&chan->active_list,
635 struct zynqmp_dma_desc_sw, node);
636 if (!desc)
637 return;
638 list_del(&desc->node);
639 dma_cookie_complete(&desc->async_tx);
640 list_add_tail(&desc->node, &chan->done_list);
641 }
642
643 /**
644 * zynqmp_dma_issue_pending - Issue pending transactions
645 * @dchan: DMA channel pointer
646 */
zynqmp_dma_issue_pending(struct dma_chan * dchan)647 static void zynqmp_dma_issue_pending(struct dma_chan *dchan)
648 {
649 struct zynqmp_dma_chan *chan = to_chan(dchan);
650 unsigned long irqflags;
651
652 spin_lock_irqsave(&chan->lock, irqflags);
653 zynqmp_dma_start_transfer(chan);
654 spin_unlock_irqrestore(&chan->lock, irqflags);
655 }
656
657 /**
658 * zynqmp_dma_free_descriptors - Free channel descriptors
659 * @chan: ZynqMP DMA channel pointer
660 */
zynqmp_dma_free_descriptors(struct zynqmp_dma_chan * chan)661 static void zynqmp_dma_free_descriptors(struct zynqmp_dma_chan *chan)
662 {
663 unsigned long irqflags;
664
665 spin_lock_irqsave(&chan->lock, irqflags);
666 zynqmp_dma_free_desc_list(chan, &chan->active_list);
667 zynqmp_dma_free_desc_list(chan, &chan->pending_list);
668 zynqmp_dma_free_desc_list(chan, &chan->done_list);
669 spin_unlock_irqrestore(&chan->lock, irqflags);
670 }
671
672 /**
673 * zynqmp_dma_free_chan_resources - Free channel resources
674 * @dchan: DMA channel pointer
675 */
zynqmp_dma_free_chan_resources(struct dma_chan * dchan)676 static void zynqmp_dma_free_chan_resources(struct dma_chan *dchan)
677 {
678 struct zynqmp_dma_chan *chan = to_chan(dchan);
679
680 zynqmp_dma_free_descriptors(chan);
681 dma_free_coherent(chan->dev,
682 (2 * ZYNQMP_DMA_DESC_SIZE(chan) * ZYNQMP_DMA_NUM_DESCS),
683 chan->desc_pool_v, chan->desc_pool_p);
684 kfree(chan->sw_desc_pool);
685 pm_runtime_mark_last_busy(chan->dev);
686 pm_runtime_put_autosuspend(chan->dev);
687 }
688
689 /**
690 * zynqmp_dma_reset - Reset the channel
691 * @chan: ZynqMP DMA channel pointer
692 */
zynqmp_dma_reset(struct zynqmp_dma_chan * chan)693 static void zynqmp_dma_reset(struct zynqmp_dma_chan *chan)
694 {
695 unsigned long irqflags;
696
697 writel(ZYNQMP_DMA_IDS_DEFAULT_MASK, chan->regs + ZYNQMP_DMA_IDS);
698
699 spin_lock_irqsave(&chan->lock, irqflags);
700 zynqmp_dma_complete_descriptor(chan);
701 spin_unlock_irqrestore(&chan->lock, irqflags);
702 zynqmp_dma_chan_desc_cleanup(chan);
703 zynqmp_dma_free_descriptors(chan);
704
705 zynqmp_dma_init(chan);
706 }
707
708 /**
709 * zynqmp_dma_irq_handler - ZynqMP DMA Interrupt handler
710 * @irq: IRQ number
711 * @data: Pointer to the ZynqMP DMA channel structure
712 *
713 * Return: IRQ_HANDLED/IRQ_NONE
714 */
zynqmp_dma_irq_handler(int irq,void * data)715 static irqreturn_t zynqmp_dma_irq_handler(int irq, void *data)
716 {
717 struct zynqmp_dma_chan *chan = (struct zynqmp_dma_chan *)data;
718 u32 isr, imr, status;
719 irqreturn_t ret = IRQ_NONE;
720
721 isr = readl(chan->regs + ZYNQMP_DMA_ISR);
722 imr = readl(chan->regs + ZYNQMP_DMA_IMR);
723 status = isr & ~imr;
724
725 writel(isr, chan->regs + ZYNQMP_DMA_ISR);
726 if (status & ZYNQMP_DMA_INT_DONE) {
727 tasklet_schedule(&chan->tasklet);
728 ret = IRQ_HANDLED;
729 }
730
731 if (status & ZYNQMP_DMA_DONE)
732 chan->idle = true;
733
734 if (status & ZYNQMP_DMA_INT_ERR) {
735 chan->err = true;
736 tasklet_schedule(&chan->tasklet);
737 dev_err(chan->dev, "Channel %p has errors\n", chan);
738 ret = IRQ_HANDLED;
739 }
740
741 if (status & ZYNQMP_DMA_INT_OVRFL) {
742 zynqmp_dma_handle_ovfl_int(chan, status);
743 dev_dbg(chan->dev, "Channel %p overflow interrupt\n", chan);
744 ret = IRQ_HANDLED;
745 }
746
747 return ret;
748 }
749
750 /**
751 * zynqmp_dma_do_tasklet - Schedule completion tasklet
752 * @t: Pointer to the ZynqMP DMA channel structure
753 */
zynqmp_dma_do_tasklet(struct tasklet_struct * t)754 static void zynqmp_dma_do_tasklet(struct tasklet_struct *t)
755 {
756 struct zynqmp_dma_chan *chan = from_tasklet(chan, t, tasklet);
757 u32 count;
758 unsigned long irqflags;
759
760 if (chan->err) {
761 zynqmp_dma_reset(chan);
762 chan->err = false;
763 return;
764 }
765
766 spin_lock_irqsave(&chan->lock, irqflags);
767 count = readl(chan->regs + ZYNQMP_DMA_IRQ_DST_ACCT);
768 while (count) {
769 zynqmp_dma_complete_descriptor(chan);
770 count--;
771 }
772 spin_unlock_irqrestore(&chan->lock, irqflags);
773
774 zynqmp_dma_chan_desc_cleanup(chan);
775
776 if (chan->idle) {
777 spin_lock_irqsave(&chan->lock, irqflags);
778 zynqmp_dma_start_transfer(chan);
779 spin_unlock_irqrestore(&chan->lock, irqflags);
780 }
781 }
782
783 /**
784 * zynqmp_dma_device_terminate_all - Aborts all transfers on a channel
785 * @dchan: DMA channel pointer
786 *
787 * Return: Always '0'
788 */
zynqmp_dma_device_terminate_all(struct dma_chan * dchan)789 static int zynqmp_dma_device_terminate_all(struct dma_chan *dchan)
790 {
791 struct zynqmp_dma_chan *chan = to_chan(dchan);
792
793 writel(ZYNQMP_DMA_IDS_DEFAULT_MASK, chan->regs + ZYNQMP_DMA_IDS);
794 zynqmp_dma_free_descriptors(chan);
795
796 return 0;
797 }
798
799 /**
800 * zynqmp_dma_synchronize - Synchronizes the termination of a transfers to the current context.
801 * @dchan: DMA channel pointer
802 */
zynqmp_dma_synchronize(struct dma_chan * dchan)803 static void zynqmp_dma_synchronize(struct dma_chan *dchan)
804 {
805 struct zynqmp_dma_chan *chan = to_chan(dchan);
806
807 tasklet_kill(&chan->tasklet);
808 }
809
810 /**
811 * zynqmp_dma_prep_memcpy - prepare descriptors for memcpy transaction
812 * @dchan: DMA channel
813 * @dma_dst: Destination buffer address
814 * @dma_src: Source buffer address
815 * @len: Transfer length
816 * @flags: transfer ack flags
817 *
818 * Return: Async transaction descriptor on success and NULL on failure
819 */
zynqmp_dma_prep_memcpy(struct dma_chan * dchan,dma_addr_t dma_dst,dma_addr_t dma_src,size_t len,ulong flags)820 static struct dma_async_tx_descriptor *zynqmp_dma_prep_memcpy(
821 struct dma_chan *dchan, dma_addr_t dma_dst,
822 dma_addr_t dma_src, size_t len, ulong flags)
823 {
824 struct zynqmp_dma_chan *chan;
825 struct zynqmp_dma_desc_sw *new, *first = NULL;
826 void *desc = NULL, *prev = NULL;
827 size_t copy;
828 u32 desc_cnt;
829 unsigned long irqflags;
830
831 chan = to_chan(dchan);
832
833 desc_cnt = DIV_ROUND_UP(len, ZYNQMP_DMA_MAX_TRANS_LEN);
834
835 spin_lock_irqsave(&chan->lock, irqflags);
836 if (desc_cnt > chan->desc_free_cnt) {
837 spin_unlock_irqrestore(&chan->lock, irqflags);
838 dev_dbg(chan->dev, "chan %p descs are not available\n", chan);
839 return NULL;
840 }
841 chan->desc_free_cnt = chan->desc_free_cnt - desc_cnt;
842 spin_unlock_irqrestore(&chan->lock, irqflags);
843
844 do {
845 /* Allocate and populate the descriptor */
846 new = zynqmp_dma_get_descriptor(chan);
847
848 copy = min_t(size_t, len, ZYNQMP_DMA_MAX_TRANS_LEN);
849 desc = (struct zynqmp_dma_desc_ll *)new->src_v;
850 zynqmp_dma_config_sg_ll_desc(chan, desc, dma_src,
851 dma_dst, copy, prev);
852 prev = desc;
853 len -= copy;
854 dma_src += copy;
855 dma_dst += copy;
856 if (!first)
857 first = new;
858 else
859 list_add_tail(&new->node, &first->tx_list);
860 } while (len);
861
862 zynqmp_dma_desc_config_eod(chan, desc);
863 async_tx_ack(&first->async_tx);
864 first->async_tx.flags = (enum dma_ctrl_flags)flags;
865 return &first->async_tx;
866 }
867
868 /**
869 * zynqmp_dma_chan_remove - Channel remove function
870 * @chan: ZynqMP DMA channel pointer
871 */
zynqmp_dma_chan_remove(struct zynqmp_dma_chan * chan)872 static void zynqmp_dma_chan_remove(struct zynqmp_dma_chan *chan)
873 {
874 if (!chan)
875 return;
876
877 if (chan->irq)
878 devm_free_irq(chan->zdev->dev, chan->irq, chan);
879 tasklet_kill(&chan->tasklet);
880 list_del(&chan->common.device_node);
881 }
882
883 /**
884 * zynqmp_dma_chan_probe - Per Channel Probing
885 * @zdev: Driver specific device structure
886 * @pdev: Pointer to the platform_device structure
887 *
888 * Return: '0' on success and failure value on error
889 */
zynqmp_dma_chan_probe(struct zynqmp_dma_device * zdev,struct platform_device * pdev)890 static int zynqmp_dma_chan_probe(struct zynqmp_dma_device *zdev,
891 struct platform_device *pdev)
892 {
893 struct zynqmp_dma_chan *chan;
894 struct device_node *node = pdev->dev.of_node;
895 int err;
896
897 chan = devm_kzalloc(zdev->dev, sizeof(*chan), GFP_KERNEL);
898 if (!chan)
899 return -ENOMEM;
900 chan->dev = zdev->dev;
901 chan->zdev = zdev;
902
903 chan->regs = devm_platform_ioremap_resource(pdev, 0);
904 if (IS_ERR(chan->regs))
905 return PTR_ERR(chan->regs);
906
907 chan->bus_width = ZYNQMP_DMA_BUS_WIDTH_64;
908 chan->dst_burst_len = ZYNQMP_DMA_MAX_DST_BURST_LEN;
909 chan->src_burst_len = ZYNQMP_DMA_MAX_SRC_BURST_LEN;
910 err = of_property_read_u32(node, "xlnx,bus-width", &chan->bus_width);
911 if (err < 0) {
912 dev_err(&pdev->dev, "missing xlnx,bus-width property\n");
913 return err;
914 }
915
916 if (chan->bus_width != ZYNQMP_DMA_BUS_WIDTH_64 &&
917 chan->bus_width != ZYNQMP_DMA_BUS_WIDTH_128) {
918 dev_err(zdev->dev, "invalid bus-width value");
919 return -EINVAL;
920 }
921
922 chan->is_dmacoherent = of_property_read_bool(node, "dma-coherent");
923 zdev->chan = chan;
924 tasklet_setup(&chan->tasklet, zynqmp_dma_do_tasklet);
925 spin_lock_init(&chan->lock);
926 INIT_LIST_HEAD(&chan->active_list);
927 INIT_LIST_HEAD(&chan->pending_list);
928 INIT_LIST_HEAD(&chan->done_list);
929 INIT_LIST_HEAD(&chan->free_list);
930
931 dma_cookie_init(&chan->common);
932 chan->common.device = &zdev->common;
933 list_add_tail(&chan->common.device_node, &zdev->common.channels);
934
935 zynqmp_dma_init(chan);
936 chan->irq = platform_get_irq(pdev, 0);
937 if (chan->irq < 0)
938 return -ENXIO;
939 err = devm_request_irq(&pdev->dev, chan->irq, zynqmp_dma_irq_handler, 0,
940 "zynqmp-dma", chan);
941 if (err)
942 return err;
943
944 chan->desc_size = sizeof(struct zynqmp_dma_desc_ll);
945 chan->idle = true;
946 return 0;
947 }
948
949 /**
950 * of_zynqmp_dma_xlate - Translation function
951 * @dma_spec: Pointer to DMA specifier as found in the device tree
952 * @ofdma: Pointer to DMA controller data
953 *
954 * Return: DMA channel pointer on success and NULL on error
955 */
of_zynqmp_dma_xlate(struct of_phandle_args * dma_spec,struct of_dma * ofdma)956 static struct dma_chan *of_zynqmp_dma_xlate(struct of_phandle_args *dma_spec,
957 struct of_dma *ofdma)
958 {
959 struct zynqmp_dma_device *zdev = ofdma->of_dma_data;
960
961 return dma_get_slave_channel(&zdev->chan->common);
962 }
963
964 /**
965 * zynqmp_dma_suspend - Suspend method for the driver
966 * @dev: Address of the device structure
967 *
968 * Put the driver into low power mode.
969 * Return: 0 on success and failure value on error
970 */
zynqmp_dma_suspend(struct device * dev)971 static int __maybe_unused zynqmp_dma_suspend(struct device *dev)
972 {
973 if (!device_may_wakeup(dev))
974 return pm_runtime_force_suspend(dev);
975
976 return 0;
977 }
978
979 /**
980 * zynqmp_dma_resume - Resume from suspend
981 * @dev: Address of the device structure
982 *
983 * Resume operation after suspend.
984 * Return: 0 on success and failure value on error
985 */
zynqmp_dma_resume(struct device * dev)986 static int __maybe_unused zynqmp_dma_resume(struct device *dev)
987 {
988 if (!device_may_wakeup(dev))
989 return pm_runtime_force_resume(dev);
990
991 return 0;
992 }
993
994 /**
995 * zynqmp_dma_runtime_suspend - Runtime suspend method for the driver
996 * @dev: Address of the device structure
997 *
998 * Put the driver into low power mode.
999 * Return: 0 always
1000 */
zynqmp_dma_runtime_suspend(struct device * dev)1001 static int __maybe_unused zynqmp_dma_runtime_suspend(struct device *dev)
1002 {
1003 struct zynqmp_dma_device *zdev = dev_get_drvdata(dev);
1004
1005 clk_disable_unprepare(zdev->clk_main);
1006 clk_disable_unprepare(zdev->clk_apb);
1007
1008 return 0;
1009 }
1010
1011 /**
1012 * zynqmp_dma_runtime_resume - Runtime suspend method for the driver
1013 * @dev: Address of the device structure
1014 *
1015 * Put the driver into low power mode.
1016 * Return: 0 always
1017 */
zynqmp_dma_runtime_resume(struct device * dev)1018 static int __maybe_unused zynqmp_dma_runtime_resume(struct device *dev)
1019 {
1020 struct zynqmp_dma_device *zdev = dev_get_drvdata(dev);
1021 int err;
1022
1023 err = clk_prepare_enable(zdev->clk_main);
1024 if (err) {
1025 dev_err(dev, "Unable to enable main clock.\n");
1026 return err;
1027 }
1028
1029 err = clk_prepare_enable(zdev->clk_apb);
1030 if (err) {
1031 dev_err(dev, "Unable to enable apb clock.\n");
1032 clk_disable_unprepare(zdev->clk_main);
1033 return err;
1034 }
1035
1036 return 0;
1037 }
1038
1039 static const struct dev_pm_ops zynqmp_dma_dev_pm_ops = {
1040 SET_SYSTEM_SLEEP_PM_OPS(zynqmp_dma_suspend, zynqmp_dma_resume)
1041 SET_RUNTIME_PM_OPS(zynqmp_dma_runtime_suspend,
1042 zynqmp_dma_runtime_resume, NULL)
1043 };
1044
1045 /**
1046 * zynqmp_dma_probe - Driver probe function
1047 * @pdev: Pointer to the platform_device structure
1048 *
1049 * Return: '0' on success and failure value on error
1050 */
zynqmp_dma_probe(struct platform_device * pdev)1051 static int zynqmp_dma_probe(struct platform_device *pdev)
1052 {
1053 struct zynqmp_dma_device *zdev;
1054 struct dma_device *p;
1055 int ret;
1056
1057 zdev = devm_kzalloc(&pdev->dev, sizeof(*zdev), GFP_KERNEL);
1058 if (!zdev)
1059 return -ENOMEM;
1060
1061 zdev->dev = &pdev->dev;
1062 INIT_LIST_HEAD(&zdev->common.channels);
1063
1064 ret = dma_set_mask_and_coherent(&pdev->dev, DMA_BIT_MASK(44));
1065 if (ret) {
1066 dev_err(&pdev->dev, "DMA not available for address range\n");
1067 return ret;
1068 }
1069 dma_cap_set(DMA_MEMCPY, zdev->common.cap_mask);
1070
1071 p = &zdev->common;
1072 p->device_prep_dma_memcpy = zynqmp_dma_prep_memcpy;
1073 p->device_terminate_all = zynqmp_dma_device_terminate_all;
1074 p->device_synchronize = zynqmp_dma_synchronize;
1075 p->device_issue_pending = zynqmp_dma_issue_pending;
1076 p->device_alloc_chan_resources = zynqmp_dma_alloc_chan_resources;
1077 p->device_free_chan_resources = zynqmp_dma_free_chan_resources;
1078 p->device_tx_status = dma_cookie_status;
1079 p->device_config = zynqmp_dma_device_config;
1080 p->dev = &pdev->dev;
1081
1082 zdev->clk_main = devm_clk_get(&pdev->dev, "clk_main");
1083 if (IS_ERR(zdev->clk_main))
1084 return dev_err_probe(&pdev->dev, PTR_ERR(zdev->clk_main),
1085 "main clock not found.\n");
1086
1087 zdev->clk_apb = devm_clk_get(&pdev->dev, "clk_apb");
1088 if (IS_ERR(zdev->clk_apb))
1089 return dev_err_probe(&pdev->dev, PTR_ERR(zdev->clk_apb),
1090 "apb clock not found.\n");
1091
1092 platform_set_drvdata(pdev, zdev);
1093 pm_runtime_set_autosuspend_delay(zdev->dev, ZDMA_PM_TIMEOUT);
1094 pm_runtime_use_autosuspend(zdev->dev);
1095 pm_runtime_enable(zdev->dev);
1096 ret = pm_runtime_resume_and_get(zdev->dev);
1097 if (ret < 0) {
1098 dev_err(&pdev->dev, "device wakeup failed.\n");
1099 pm_runtime_disable(zdev->dev);
1100 }
1101 if (!pm_runtime_enabled(zdev->dev)) {
1102 ret = zynqmp_dma_runtime_resume(zdev->dev);
1103 if (ret)
1104 return ret;
1105 }
1106
1107 ret = zynqmp_dma_chan_probe(zdev, pdev);
1108 if (ret) {
1109 dev_err_probe(&pdev->dev, ret, "Probing channel failed\n");
1110 goto err_disable_pm;
1111 }
1112
1113 p->dst_addr_widths = BIT(zdev->chan->bus_width / 8);
1114 p->src_addr_widths = BIT(zdev->chan->bus_width / 8);
1115
1116 ret = dma_async_device_register(&zdev->common);
1117 if (ret) {
1118 dev_err(zdev->dev, "failed to register the dma device\n");
1119 goto free_chan_resources;
1120 }
1121
1122 ret = of_dma_controller_register(pdev->dev.of_node,
1123 of_zynqmp_dma_xlate, zdev);
1124 if (ret) {
1125 dev_err_probe(&pdev->dev, ret, "Unable to register DMA to DT\n");
1126 dma_async_device_unregister(&zdev->common);
1127 goto free_chan_resources;
1128 }
1129
1130 pm_runtime_mark_last_busy(zdev->dev);
1131 pm_runtime_put_sync_autosuspend(zdev->dev);
1132
1133 return 0;
1134
1135 free_chan_resources:
1136 zynqmp_dma_chan_remove(zdev->chan);
1137 err_disable_pm:
1138 if (!pm_runtime_enabled(zdev->dev))
1139 zynqmp_dma_runtime_suspend(zdev->dev);
1140 pm_runtime_disable(zdev->dev);
1141 return ret;
1142 }
1143
1144 /**
1145 * zynqmp_dma_remove - Driver remove function
1146 * @pdev: Pointer to the platform_device structure
1147 *
1148 * Return: Always '0'
1149 */
zynqmp_dma_remove(struct platform_device * pdev)1150 static void zynqmp_dma_remove(struct platform_device *pdev)
1151 {
1152 struct zynqmp_dma_device *zdev = platform_get_drvdata(pdev);
1153
1154 of_dma_controller_free(pdev->dev.of_node);
1155 dma_async_device_unregister(&zdev->common);
1156
1157 zynqmp_dma_chan_remove(zdev->chan);
1158 pm_runtime_disable(zdev->dev);
1159 if (!pm_runtime_enabled(zdev->dev))
1160 zynqmp_dma_runtime_suspend(zdev->dev);
1161 }
1162
1163 static const struct of_device_id zynqmp_dma_of_match[] = {
1164 { .compatible = "xlnx,zynqmp-dma-1.0", },
1165 {}
1166 };
1167 MODULE_DEVICE_TABLE(of, zynqmp_dma_of_match);
1168
1169 static struct platform_driver zynqmp_dma_driver = {
1170 .driver = {
1171 .name = "xilinx-zynqmp-dma",
1172 .of_match_table = zynqmp_dma_of_match,
1173 .pm = &zynqmp_dma_dev_pm_ops,
1174 },
1175 .probe = zynqmp_dma_probe,
1176 .remove_new = zynqmp_dma_remove,
1177 };
1178
1179 module_platform_driver(zynqmp_dma_driver);
1180
1181 MODULE_LICENSE("GPL");
1182 MODULE_AUTHOR("Xilinx, Inc.");
1183 MODULE_DESCRIPTION("Xilinx ZynqMP DMA driver");
1184