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dmaengine: xilinx: dpdma: Make symbol 'dpdma_debugfs_reqs' static
[mirror_ubuntu-hirsute-kernel.git] / drivers / dma / xilinx / xilinx_dpdma.c
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7cbb0c63
HK		 1// SPDX-License-Identifier: GPL-2.0
2/*
3 * Xilinx ZynqMP DPDMA Engine driver
4 *
5 * Copyright (C) 2015 - 2020 Xilinx, Inc.
6 *
7 * Author: Hyun Woo Kwon <hyun.kwon@xilinx.com>
8 */
9
10#include <linux/bitfield.h>
11#include <linux/bits.h>
12#include <linux/clk.h>
1d220435 13#include <linux/debugfs.h>
7cbb0c63
HK		 14#include <linux/delay.h>
15#include <linux/dmaengine.h>
16#include <linux/dmapool.h>
17#include <linux/interrupt.h>
18#include <linux/module.h>
19#include <linux/of.h>
20#include <linux/of_dma.h>
21#include <linux/platform_device.h>
22#include <linux/sched.h>
23#include <linux/slab.h>
24#include <linux/spinlock.h>
25#include <linux/wait.h>
26
27#include <dt-bindings/dma/xlnx-zynqmp-dpdma.h>
28
29#include "../dmaengine.h"
30#include "../virt-dma.h"
31
32/* DPDMA registers */
33#define XILINX_DPDMA_ERR_CTRL 0x000
34#define XILINX_DPDMA_ISR 0x004
35#define XILINX_DPDMA_IMR 0x008
36#define XILINX_DPDMA_IEN 0x00c
37#define XILINX_DPDMA_IDS 0x010
38#define XILINX_DPDMA_INTR_DESC_DONE(n) BIT((n) + 0)
39#define XILINX_DPDMA_INTR_DESC_DONE_MASK GENMASK(5, 0)
40#define XILINX_DPDMA_INTR_NO_OSTAND(n) BIT((n) + 6)
41#define XILINX_DPDMA_INTR_NO_OSTAND_MASK GENMASK(11, 6)
42#define XILINX_DPDMA_INTR_AXI_ERR(n) BIT((n) + 12)
43#define XILINX_DPDMA_INTR_AXI_ERR_MASK GENMASK(17, 12)
44#define XILINX_DPDMA_INTR_DESC_ERR(n) BIT((n) + 16)
45#define XILINX_DPDMA_INTR_DESC_ERR_MASK GENMASK(23, 18)
46#define XILINX_DPDMA_INTR_WR_CMD_FIFO_FULL BIT(24)
47#define XILINX_DPDMA_INTR_WR_DATA_FIFO_FULL BIT(25)
48#define XILINX_DPDMA_INTR_AXI_4K_CROSS BIT(26)
49#define XILINX_DPDMA_INTR_VSYNC BIT(27)
50#define XILINX_DPDMA_INTR_CHAN_ERR_MASK 0x00041000
51#define XILINX_DPDMA_INTR_CHAN_ERR 0x00fff000
52#define XILINX_DPDMA_INTR_GLOBAL_ERR 0x07000000
53#define XILINX_DPDMA_INTR_ERR_ALL 0x07fff000
54#define XILINX_DPDMA_INTR_CHAN_MASK 0x00041041
55#define XILINX_DPDMA_INTR_GLOBAL_MASK 0x0f000000
56#define XILINX_DPDMA_INTR_ALL 0x0fffffff
57#define XILINX_DPDMA_EISR 0x014
58#define XILINX_DPDMA_EIMR 0x018
59#define XILINX_DPDMA_EIEN 0x01c
60#define XILINX_DPDMA_EIDS 0x020
61#define XILINX_DPDMA_EINTR_INV_APB BIT(0)
62#define XILINX_DPDMA_EINTR_RD_AXI_ERR(n) BIT((n) + 1)
63#define XILINX_DPDMA_EINTR_RD_AXI_ERR_MASK GENMASK(6, 1)
64#define XILINX_DPDMA_EINTR_PRE_ERR(n) BIT((n) + 7)
65#define XILINX_DPDMA_EINTR_PRE_ERR_MASK GENMASK(12, 7)
66#define XILINX_DPDMA_EINTR_CRC_ERR(n) BIT((n) + 13)
67#define XILINX_DPDMA_EINTR_CRC_ERR_MASK GENMASK(18, 13)
68#define XILINX_DPDMA_EINTR_WR_AXI_ERR(n) BIT((n) + 19)
69#define XILINX_DPDMA_EINTR_WR_AXI_ERR_MASK GENMASK(24, 19)
70#define XILINX_DPDMA_EINTR_DESC_DONE_ERR(n) BIT((n) + 25)
71#define XILINX_DPDMA_EINTR_DESC_DONE_ERR_MASK GENMASK(30, 25)
72#define XILINX_DPDMA_EINTR_RD_CMD_FIFO_FULL BIT(32)
73#define XILINX_DPDMA_EINTR_CHAN_ERR_MASK 0x02082082
74#define XILINX_DPDMA_EINTR_CHAN_ERR 0x7ffffffe
75#define XILINX_DPDMA_EINTR_GLOBAL_ERR 0x80000001
76#define XILINX_DPDMA_EINTR_ALL 0xffffffff
77#define XILINX_DPDMA_CNTL 0x100
78#define XILINX_DPDMA_GBL 0x104
79#define XILINX_DPDMA_GBL_TRIG_MASK(n) ((n) << 0)
80#define XILINX_DPDMA_GBL_RETRIG_MASK(n) ((n) << 6)
81#define XILINX_DPDMA_ALC0_CNTL 0x108
82#define XILINX_DPDMA_ALC0_STATUS 0x10c
83#define XILINX_DPDMA_ALC0_MAX 0x110
84#define XILINX_DPDMA_ALC0_MIN 0x114
85#define XILINX_DPDMA_ALC0_ACC 0x118
86#define XILINX_DPDMA_ALC0_ACC_TRAN 0x11c
87#define XILINX_DPDMA_ALC1_CNTL 0x120
88#define XILINX_DPDMA_ALC1_STATUS 0x124
89#define XILINX_DPDMA_ALC1_MAX 0x128
90#define XILINX_DPDMA_ALC1_MIN 0x12c
91#define XILINX_DPDMA_ALC1_ACC 0x130
92#define XILINX_DPDMA_ALC1_ACC_TRAN 0x134
93
94/* Channel register */
95#define XILINX_DPDMA_CH_BASE 0x200
96#define XILINX_DPDMA_CH_OFFSET 0x100
97#define XILINX_DPDMA_CH_DESC_START_ADDRE 0x000
98#define XILINX_DPDMA_CH_DESC_START_ADDRE_MASK GENMASK(15, 0)
99#define XILINX_DPDMA_CH_DESC_START_ADDR 0x004
100#define XILINX_DPDMA_CH_DESC_NEXT_ADDRE 0x008
101#define XILINX_DPDMA_CH_DESC_NEXT_ADDR 0x00c
102#define XILINX_DPDMA_CH_PYLD_CUR_ADDRE 0x010
103#define XILINX_DPDMA_CH_PYLD_CUR_ADDR 0x014
104#define XILINX_DPDMA_CH_CNTL 0x018
105#define XILINX_DPDMA_CH_CNTL_ENABLE BIT(0)
106#define XILINX_DPDMA_CH_CNTL_PAUSE BIT(1)
107#define XILINX_DPDMA_CH_CNTL_QOS_DSCR_WR_MASK GENMASK(5, 2)
108#define XILINX_DPDMA_CH_CNTL_QOS_DSCR_RD_MASK GENMASK(9, 6)
109#define XILINX_DPDMA_CH_CNTL_QOS_DATA_RD_MASK GENMASK(13, 10)
110#define XILINX_DPDMA_CH_CNTL_QOS_VID_CLASS 11
111#define XILINX_DPDMA_CH_STATUS 0x01c
112#define XILINX_DPDMA_CH_STATUS_OTRAN_CNT_MASK GENMASK(24, 21)
113#define XILINX_DPDMA_CH_VDO 0x020
114#define XILINX_DPDMA_CH_PYLD_SZ 0x024
115#define XILINX_DPDMA_CH_DESC_ID 0x028
116
117/* DPDMA descriptor fields */
118#define XILINX_DPDMA_DESC_CONTROL_PREEMBLE 0xa5
119#define XILINX_DPDMA_DESC_CONTROL_COMPLETE_INTR BIT(8)
120#define XILINX_DPDMA_DESC_CONTROL_DESC_UPDATE BIT(9)
121#define XILINX_DPDMA_DESC_CONTROL_IGNORE_DONE BIT(10)
122#define XILINX_DPDMA_DESC_CONTROL_FRAG_MODE BIT(18)
123#define XILINX_DPDMA_DESC_CONTROL_LAST BIT(19)
124#define XILINX_DPDMA_DESC_CONTROL_ENABLE_CRC BIT(20)
125#define XILINX_DPDMA_DESC_CONTROL_LAST_OF_FRAME BIT(21)
126#define XILINX_DPDMA_DESC_ID_MASK GENMASK(15, 0)
127#define XILINX_DPDMA_DESC_HSIZE_STRIDE_HSIZE_MASK GENMASK(17, 0)
128#define XILINX_DPDMA_DESC_HSIZE_STRIDE_STRIDE_MASK GENMASK(31, 18)
129#define XILINX_DPDMA_DESC_ADDR_EXT_NEXT_ADDR_MASK GENMASK(15, 0)
130#define XILINX_DPDMA_DESC_ADDR_EXT_SRC_ADDR_MASK GENMASK(31, 16)
131
132#define XILINX_DPDMA_ALIGN_BYTES 256
133#define XILINX_DPDMA_LINESIZE_ALIGN_BITS 128
134
135#define XILINX_DPDMA_NUM_CHAN 6
136
137struct xilinx_dpdma_chan;
138
139/**
140 * struct xilinx_dpdma_hw_desc - DPDMA hardware descriptor
141 * @control: control configuration field
142 * @desc_id: descriptor ID
143 * @xfer_size: transfer size
144 * @hsize_stride: horizontal size and stride
145 * @timestamp_lsb: LSB of time stamp
146 * @timestamp_msb: MSB of time stamp
147 * @addr_ext: upper 16 bit of 48 bit address (next_desc and src_addr)
148 * @next_desc: next descriptor 32 bit address
149 * @src_addr: payload source address (1st page, 32 LSB)
150 * @addr_ext_23: payload source address (3nd and 3rd pages, 16 LSBs)
151 * @addr_ext_45: payload source address (4th and 5th pages, 16 LSBs)
152 * @src_addr2: payload source address (2nd page, 32 LSB)
153 * @src_addr3: payload source address (3rd page, 32 LSB)
154 * @src_addr4: payload source address (4th page, 32 LSB)
155 * @src_addr5: payload source address (5th page, 32 LSB)
156 * @crc: descriptor CRC
157 */
158struct xilinx_dpdma_hw_desc {
159 u32 control;
160 u32 desc_id;
161 u32 xfer_size;
162 u32 hsize_stride;
163 u32 timestamp_lsb;
164 u32 timestamp_msb;
165 u32 addr_ext;
166 u32 next_desc;
167 u32 src_addr;
168 u32 addr_ext_23;
169 u32 addr_ext_45;
170 u32 src_addr2;
171 u32 src_addr3;
172 u32 src_addr4;
173 u32 src_addr5;
174 u32 crc;
175} __aligned(XILINX_DPDMA_ALIGN_BYTES);
176
177/**
178 * struct xilinx_dpdma_sw_desc - DPDMA software descriptor
179 * @hw: DPDMA hardware descriptor
180 * @node: list node for software descriptors
181 * @dma_addr: DMA address of the software descriptor
182 */
183struct xilinx_dpdma_sw_desc {
184 struct xilinx_dpdma_hw_desc hw;
185 struct list_head node;
186 dma_addr_t dma_addr;
187};
188
189/**
190 * struct xilinx_dpdma_tx_desc - DPDMA transaction descriptor
191 * @vdesc: virtual DMA descriptor
192 * @chan: DMA channel
193 * @descriptors: list of software descriptors
194 * @error: an error has been detected with this descriptor
195 */
196struct xilinx_dpdma_tx_desc {
197 struct virt_dma_desc vdesc;
198 struct xilinx_dpdma_chan *chan;
199 struct list_head descriptors;
200 bool error;
201};
202
203#define to_dpdma_tx_desc(_desc) \
204 container_of(_desc, struct xilinx_dpdma_tx_desc, vdesc)
205
206/**
207 * struct xilinx_dpdma_chan - DPDMA channel
208 * @vchan: virtual DMA channel
209 * @reg: register base address
210 * @id: channel ID
211 * @wait_to_stop: queue to wait for outstanding transacitons before stopping
212 * @running: true if the channel is running
213 * @first_frame: flag for the first frame of stream
214 * @video_group: flag if multi-channel operation is needed for video channels
215 * @lock: lock to access struct xilinx_dpdma_chan
216 * @desc_pool: descriptor allocation pool
217 * @err_task: error IRQ bottom half handler
bc227385 218 * @desc: References to descriptors being processed
7cbb0c63
HK		 219 * @desc.pending: Descriptor schedule to the hardware, pending execution
220 * @desc.active: Descriptor being executed by the hardware
221 * @xdev: DPDMA device
222 */
223struct xilinx_dpdma_chan {
224 struct virt_dma_chan vchan;
225 void __iomem *reg;
226 unsigned int id;
227
228 wait_queue_head_t wait_to_stop;
229 bool running;
230 bool first_frame;
231 bool video_group;
232
233 spinlock_t lock; /* lock to access struct xilinx_dpdma_chan */
234 struct dma_pool *desc_pool;
235 struct tasklet_struct err_task;
236
237 struct {
238 struct xilinx_dpdma_tx_desc *pending;
239 struct xilinx_dpdma_tx_desc *active;
240 } desc;
241
242 struct xilinx_dpdma_device *xdev;
243};
244
245#define to_xilinx_chan(_chan) \
246 container_of(_chan, struct xilinx_dpdma_chan, vchan.chan)
247
248/**
249 * struct xilinx_dpdma_device - DPDMA device
250 * @common: generic dma device structure
251 * @reg: register base address
252 * @dev: generic device structure
253 * @irq: the interrupt number
254 * @axi_clk: axi clock
255 * @chan: DPDMA channels
256 * @ext_addr: flag for 64 bit system (48 bit addressing)
257 */
258struct xilinx_dpdma_device {
259 struct dma_device common;
260 void __iomem *reg;
261 struct device *dev;
262 int irq;
263
264 struct clk *axi_clk;
265 struct xilinx_dpdma_chan *chan[XILINX_DPDMA_NUM_CHAN];
266
267 bool ext_addr;
268};
269
1d220435
LP		 270/* -----------------------------------------------------------------------------
271 * DebugFS
272 */
273
274#ifdef CONFIG_DEBUG_FS
275
276#define XILINX_DPDMA_DEBUGFS_READ_MAX_SIZE 32
277#define XILINX_DPDMA_DEBUGFS_UINT16_MAX_STR "65535"
278
279/* Match xilinx_dpdma_testcases vs dpdma_debugfs_reqs[] entry */
280enum xilinx_dpdma_testcases {
281 DPDMA_TC_INTR_DONE,
282 DPDMA_TC_NONE
283};
284
285struct xilinx_dpdma_debugfs {
286 enum xilinx_dpdma_testcases testcase;
287 u16 xilinx_dpdma_irq_done_count;
288 unsigned int chan_id;
289};
290
291static struct xilinx_dpdma_debugfs dpdma_debugfs;
292struct xilinx_dpdma_debugfs_request {
293 const char *name;
294 enum xilinx_dpdma_testcases tc;
295 ssize_t (*read)(char *buf);
296 int (*write)(char *args);
297};
298
299static void xilinx_dpdma_debugfs_desc_done_irq(struct xilinx_dpdma_chan *chan)
300{
301 if (chan->id == dpdma_debugfs.chan_id)
302 dpdma_debugfs.xilinx_dpdma_irq_done_count++;
303}
304
305static ssize_t xilinx_dpdma_debugfs_desc_done_irq_read(char *buf)
306{
307 size_t out_str_len;
308
309 dpdma_debugfs.testcase = DPDMA_TC_NONE;
310
311 out_str_len = strlen(XILINX_DPDMA_DEBUGFS_UINT16_MAX_STR);
312 out_str_len = min_t(size_t, XILINX_DPDMA_DEBUGFS_READ_MAX_SIZE,
313 out_str_len);
314 snprintf(buf, out_str_len, "%d",
315 dpdma_debugfs.xilinx_dpdma_irq_done_count);
316
317 return 0;
318}
319
320static int xilinx_dpdma_debugfs_desc_done_irq_write(char *args)
321{
322 char *arg;
323 int ret;
324 u32 id;
325
326 arg = strsep(&args, " ");
327 if (!arg || strncasecmp(arg, "start", 5))
328 return -EINVAL;
329
330 arg = strsep(&args, " ");
331 if (!arg)
332 return -EINVAL;
333
334 ret = kstrtou32(arg, 0, &id);
335 if (ret < 0)
336 return ret;
337
338 if (id < ZYNQMP_DPDMA_VIDEO0 || id > ZYNQMP_DPDMA_AUDIO1)
339 return -EINVAL;
340
341 dpdma_debugfs.testcase = DPDMA_TC_INTR_DONE;
342 dpdma_debugfs.xilinx_dpdma_irq_done_count = 0;
343 dpdma_debugfs.chan_id = id;
344
345 return 0;
346}
347
348/* Match xilinx_dpdma_testcases vs dpdma_debugfs_reqs[] entry */
144ceb27 349static struct xilinx_dpdma_debugfs_request dpdma_debugfs_reqs[] = {
1d220435
LP		 350 {
351 .name = "DESCRIPTOR_DONE_INTR",
352 .tc = DPDMA_TC_INTR_DONE,
353 .read = xilinx_dpdma_debugfs_desc_done_irq_read,
354 .write = xilinx_dpdma_debugfs_desc_done_irq_write,
355 },
356};
357
358static ssize_t xilinx_dpdma_debugfs_read(struct file *f, char __user *buf,
359 size_t size, loff_t *pos)
360{
361 enum xilinx_dpdma_testcases testcase;
362 char *kern_buff;
363 int ret = 0;
364
365 if (*pos != 0 || size <= 0)
366 return -EINVAL;
367
368 kern_buff = kzalloc(XILINX_DPDMA_DEBUGFS_READ_MAX_SIZE, GFP_KERNEL);
369 if (!kern_buff) {
370 dpdma_debugfs.testcase = DPDMA_TC_NONE;
371 return -ENOMEM;
372 }
373
374 testcase = READ_ONCE(dpdma_debugfs.testcase);
375 if (testcase != DPDMA_TC_NONE) {
376 ret = dpdma_debugfs_reqs[testcase].read(kern_buff);
377 if (ret < 0)
378 goto done;
379 } else {
380 strlcpy(kern_buff, "No testcase executed",
381 XILINX_DPDMA_DEBUGFS_READ_MAX_SIZE);
382 }
383
384 size = min(size, strlen(kern_buff));
385 if (copy_to_user(buf, kern_buff, size))
386 ret = -EFAULT;
387
388done:
389 kfree(kern_buff);
390 if (ret)
391 return ret;
392
393 *pos = size + 1;
394 return size;
395}
396
397static ssize_t xilinx_dpdma_debugfs_write(struct file *f,
398 const char __user *buf, size_t size,
399 loff_t *pos)
400{
401 char *kern_buff, *kern_buff_start;
402 char *testcase;
403 unsigned int i;
404 int ret;
405
406 if (*pos != 0 || size <= 0)
407 return -EINVAL;
408
409 /* Supporting single instance of test as of now. */
410 if (dpdma_debugfs.testcase != DPDMA_TC_NONE)
411 return -EBUSY;
412
413 kern_buff = kzalloc(size, GFP_KERNEL);
414 if (!kern_buff)
415 return -ENOMEM;
416 kern_buff_start = kern_buff;
417
418 ret = strncpy_from_user(kern_buff, buf, size);
419 if (ret < 0)
420 goto done;
421
422 /* Read the testcase name from a user request. */
423 testcase = strsep(&kern_buff, " ");
424
425 for (i = 0; i < ARRAY_SIZE(dpdma_debugfs_reqs); i++) {
426 if (!strcasecmp(testcase, dpdma_debugfs_reqs[i].name))
427 break;
428 }
429
430 if (i == ARRAY_SIZE(dpdma_debugfs_reqs)) {
431 ret = -EINVAL;
432 goto done;
433 }
434
435 ret = dpdma_debugfs_reqs[i].write(kern_buff);
436 if (ret < 0)
437 goto done;
438
439 ret = size;
440
441done:
442 kfree(kern_buff_start);
443 return ret;
444}
445
446static const struct file_operations fops_xilinx_dpdma_dbgfs = {
447 .owner = THIS_MODULE,
448 .read = xilinx_dpdma_debugfs_read,
449 .write = xilinx_dpdma_debugfs_write,
450};
451
452static void xilinx_dpdma_debugfs_init(struct xilinx_dpdma_device *xdev)
453{
454 struct dentry *dent;
455
456 dpdma_debugfs.testcase = DPDMA_TC_NONE;
457
458 dent = debugfs_create_file("testcase", 0444, xdev->common.dbg_dev_root,
459 NULL, &fops_xilinx_dpdma_dbgfs);
460 if (IS_ERR(dent))
461 dev_err(xdev->dev, "Failed to create debugfs testcase file\n");
462}
463
464#else
465static void xilinx_dpdma_debugfs_init(struct xilinx_dpdma_device *xdev)
466{
467}
468
469static void xilinx_dpdma_debugfs_desc_done_irq(struct xilinx_dpdma_chan *chan)
470{
471}
472#endif /* CONFIG_DEBUG_FS */
473
7cbb0c63
HK		 474/* -----------------------------------------------------------------------------
475 * I/O Accessors
476 */
477
478static inline u32 dpdma_read(void __iomem *base, u32 offset)
479{
480 return ioread32(base + offset);
481}
482
483static inline void dpdma_write(void __iomem *base, u32 offset, u32 val)
484{
485 iowrite32(val, base + offset);
486}
487
488static inline void dpdma_clr(void __iomem *base, u32 offset, u32 clr)
489{
490 dpdma_write(base, offset, dpdma_read(base, offset) & ~clr);
491}
492
493static inline void dpdma_set(void __iomem *base, u32 offset, u32 set)
494{
495 dpdma_write(base, offset, dpdma_read(base, offset) | set);
496}
497
498/* -----------------------------------------------------------------------------
499 * Descriptor Operations
500 */
501
502/**
503 * xilinx_dpdma_sw_desc_set_dma_addrs - Set DMA addresses in the descriptor
ea55b6a3 504 * @xdev: DPDMA device
7cbb0c63
HK		 505 * @sw_desc: The software descriptor in which to set DMA addresses
506 * @prev: The previous descriptor
507 * @dma_addr: array of dma addresses
508 * @num_src_addr: number of addresses in @dma_addr
509 *
510 * Set all the DMA addresses in the hardware descriptor corresponding to @dev
511 * from @dma_addr. If a previous descriptor is specified in @prev, its next
512 * descriptor DMA address is set to the DMA address of @sw_desc. @prev may be
513 * identical to @sw_desc for cyclic transfers.
514 */
515static void xilinx_dpdma_sw_desc_set_dma_addrs(struct xilinx_dpdma_device *xdev,
516 struct xilinx_dpdma_sw_desc *sw_desc,
517 struct xilinx_dpdma_sw_desc *prev,
518 dma_addr_t dma_addr[],
519 unsigned int num_src_addr)
520{
521 struct xilinx_dpdma_hw_desc *hw_desc = &sw_desc->hw;
522 unsigned int i;
523
524 hw_desc->src_addr = lower_32_bits(dma_addr[0]);
525 if (xdev->ext_addr)
526 hw_desc->addr_ext |=
527 FIELD_PREP(XILINX_DPDMA_DESC_ADDR_EXT_SRC_ADDR_MASK,
528 upper_32_bits(dma_addr[0]));
529
530 for (i = 1; i < num_src_addr; i++) {
531 u32 *addr = &hw_desc->src_addr2;
532
533 addr[i-1] = lower_32_bits(dma_addr[i]);
534
535 if (xdev->ext_addr) {
536 u32 *addr_ext = &hw_desc->addr_ext_23;
537 u32 addr_msb;
538
539 addr_msb = upper_32_bits(dma_addr[i]) & GENMASK(15, 0);
540 addr_msb <<= 16 * ((i - 1) % 2);
541 addr_ext[(i - 1) / 2] |= addr_msb;
542 }
543 }
544
545 if (!prev)
546 return;
547
548 prev->hw.next_desc = lower_32_bits(sw_desc->dma_addr);
549 if (xdev->ext_addr)
550 prev->hw.addr_ext |=
551 FIELD_PREP(XILINX_DPDMA_DESC_ADDR_EXT_NEXT_ADDR_MASK,
552 upper_32_bits(sw_desc->dma_addr));
553}
554
555/**
556 * xilinx_dpdma_chan_alloc_sw_desc - Allocate a software descriptor
557 * @chan: DPDMA channel
558 *
559 * Allocate a software descriptor from the channel's descriptor pool.
560 *
561 * Return: a software descriptor or NULL.
562 */
563static struct xilinx_dpdma_sw_desc *
564xilinx_dpdma_chan_alloc_sw_desc(struct xilinx_dpdma_chan *chan)
565{
566 struct xilinx_dpdma_sw_desc *sw_desc;
567 dma_addr_t dma_addr;
568
569 sw_desc = dma_pool_zalloc(chan->desc_pool, GFP_ATOMIC, &dma_addr);
570 if (!sw_desc)
571 return NULL;
572
573 sw_desc->dma_addr = dma_addr;
574
575 return sw_desc;
576}
577
578/**
579 * xilinx_dpdma_chan_free_sw_desc - Free a software descriptor
580 * @chan: DPDMA channel
581 * @sw_desc: software descriptor to free
582 *
583 * Free a software descriptor from the channel's descriptor pool.
584 */
585static void
586xilinx_dpdma_chan_free_sw_desc(struct xilinx_dpdma_chan *chan,
587 struct xilinx_dpdma_sw_desc *sw_desc)
588{
589 dma_pool_free(chan->desc_pool, sw_desc, sw_desc->dma_addr);
590}
591
592/**
593 * xilinx_dpdma_chan_dump_tx_desc - Dump a tx descriptor
594 * @chan: DPDMA channel
595 * @tx_desc: tx descriptor to dump
596 *
597 * Dump contents of a tx descriptor
598 */
599static void xilinx_dpdma_chan_dump_tx_desc(struct xilinx_dpdma_chan *chan,
600 struct xilinx_dpdma_tx_desc *tx_desc)
601{
602 struct xilinx_dpdma_sw_desc *sw_desc;
603 struct device *dev = chan->xdev->dev;
604 unsigned int i = 0;
605
606 dev_dbg(dev, "------- TX descriptor dump start -------\n");
607 dev_dbg(dev, "------- channel ID = %d -------\n", chan->id);
608
609 list_for_each_entry(sw_desc, &tx_desc->descriptors, node) {
610 struct xilinx_dpdma_hw_desc *hw_desc = &sw_desc->hw;
611
612 dev_dbg(dev, "------- HW descriptor %d -------\n", i++);
613 dev_dbg(dev, "descriptor DMA addr: %pad\n", &sw_desc->dma_addr);
614 dev_dbg(dev, "control: 0x%08x\n", hw_desc->control);
615 dev_dbg(dev, "desc_id: 0x%08x\n", hw_desc->desc_id);
616 dev_dbg(dev, "xfer_size: 0x%08x\n", hw_desc->xfer_size);
617 dev_dbg(dev, "hsize_stride: 0x%08x\n", hw_desc->hsize_stride);
618 dev_dbg(dev, "timestamp_lsb: 0x%08x\n", hw_desc->timestamp_lsb);
619 dev_dbg(dev, "timestamp_msb: 0x%08x\n", hw_desc->timestamp_msb);
620 dev_dbg(dev, "addr_ext: 0x%08x\n", hw_desc->addr_ext);
621 dev_dbg(dev, "next_desc: 0x%08x\n", hw_desc->next_desc);
622 dev_dbg(dev, "src_addr: 0x%08x\n", hw_desc->src_addr);
623 dev_dbg(dev, "addr_ext_23: 0x%08x\n", hw_desc->addr_ext_23);
624 dev_dbg(dev, "addr_ext_45: 0x%08x\n", hw_desc->addr_ext_45);
625 dev_dbg(dev, "src_addr2: 0x%08x\n", hw_desc->src_addr2);
626 dev_dbg(dev, "src_addr3: 0x%08x\n", hw_desc->src_addr3);
627 dev_dbg(dev, "src_addr4: 0x%08x\n", hw_desc->src_addr4);
628 dev_dbg(dev, "src_addr5: 0x%08x\n", hw_desc->src_addr5);
629 dev_dbg(dev, "crc: 0x%08x\n", hw_desc->crc);
630 }
631
632 dev_dbg(dev, "------- TX descriptor dump end -------\n");
633}
634
635/**
636 * xilinx_dpdma_chan_alloc_tx_desc - Allocate a transaction descriptor
637 * @chan: DPDMA channel
638 *
639 * Allocate a tx descriptor.
640 *
641 * Return: a tx descriptor or NULL.
642 */
643static struct xilinx_dpdma_tx_desc *
644xilinx_dpdma_chan_alloc_tx_desc(struct xilinx_dpdma_chan *chan)
645{
646 struct xilinx_dpdma_tx_desc *tx_desc;
647
648 tx_desc = kzalloc(sizeof(*tx_desc), GFP_NOWAIT);
649 if (!tx_desc)
650 return NULL;
651
652 INIT_LIST_HEAD(&tx_desc->descriptors);
653 tx_desc->chan = chan;
654 tx_desc->error = false;
655
656 return tx_desc;
657}
658
659/**
660 * xilinx_dpdma_chan_free_tx_desc - Free a virtual DMA descriptor
661 * @vdesc: virtual DMA descriptor
662 *
663 * Free the virtual DMA descriptor @vdesc including its software descriptors.
664 */
665static void xilinx_dpdma_chan_free_tx_desc(struct virt_dma_desc *vdesc)
666{
667 struct xilinx_dpdma_sw_desc *sw_desc, *next;
668 struct xilinx_dpdma_tx_desc *desc;
669
670 if (!vdesc)
671 return;
672
673 desc = to_dpdma_tx_desc(vdesc);
674
675 list_for_each_entry_safe(sw_desc, next, &desc->descriptors, node) {
676 list_del(&sw_desc->node);
677 xilinx_dpdma_chan_free_sw_desc(desc->chan, sw_desc);
678 }
679
680 kfree(desc);
681}
682
683/**
684 * xilinx_dpdma_chan_prep_interleaved_dma - Prepare an interleaved dma
685 * descriptor
686 * @chan: DPDMA channel
687 * @xt: dma interleaved template
688 *
689 * Prepare a tx descriptor including internal software/hardware descriptors
690 * based on @xt.
691 *
692 * Return: A DPDMA TX descriptor on success, or NULL.
693 */
694static struct xilinx_dpdma_tx_desc *
695xilinx_dpdma_chan_prep_interleaved_dma(struct xilinx_dpdma_chan *chan,
696 struct dma_interleaved_template *xt)
697{
698 struct xilinx_dpdma_tx_desc *tx_desc;
699 struct xilinx_dpdma_sw_desc *sw_desc;
700 struct xilinx_dpdma_hw_desc *hw_desc;
701 size_t hsize = xt->sgl[0].size;
702 size_t stride = hsize + xt->sgl[0].icg;
703
704 if (!IS_ALIGNED(xt->src_start, XILINX_DPDMA_ALIGN_BYTES)) {
705 dev_err(chan->xdev->dev, "buffer should be aligned at %d B\n",
706 XILINX_DPDMA_ALIGN_BYTES);
707 return NULL;
708 }
709
710 tx_desc = xilinx_dpdma_chan_alloc_tx_desc(chan);
711 if (!tx_desc)
712 return NULL;
713
714 sw_desc = xilinx_dpdma_chan_alloc_sw_desc(chan);
715 if (!sw_desc) {
716 xilinx_dpdma_chan_free_tx_desc(&tx_desc->vdesc);
717 return NULL;
718 }
719
720 xilinx_dpdma_sw_desc_set_dma_addrs(chan->xdev, sw_desc, sw_desc,
721 &xt->src_start, 1);
722
723 hw_desc = &sw_desc->hw;
724 hsize = ALIGN(hsize, XILINX_DPDMA_LINESIZE_ALIGN_BITS / 8);
725 hw_desc->xfer_size = hsize * xt->numf;
726 hw_desc->hsize_stride =
727 FIELD_PREP(XILINX_DPDMA_DESC_HSIZE_STRIDE_HSIZE_MASK, hsize) |
728 FIELD_PREP(XILINX_DPDMA_DESC_HSIZE_STRIDE_STRIDE_MASK,
729 stride / 16);
730 hw_desc->control |= XILINX_DPDMA_DESC_CONTROL_PREEMBLE;
731 hw_desc->control |= XILINX_DPDMA_DESC_CONTROL_COMPLETE_INTR;
732 hw_desc->control |= XILINX_DPDMA_DESC_CONTROL_IGNORE_DONE;
733 hw_desc->control |= XILINX_DPDMA_DESC_CONTROL_LAST_OF_FRAME;
734
735 list_add_tail(&sw_desc->node, &tx_desc->descriptors);
736
737 return tx_desc;
738}
739
740/* -----------------------------------------------------------------------------
741 * DPDMA Channel Operations
742 */
743
744/**
745 * xilinx_dpdma_chan_enable - Enable the channel
746 * @chan: DPDMA channel
747 *
748 * Enable the channel and its interrupts. Set the QoS values for video class.
749 */
750static void xilinx_dpdma_chan_enable(struct xilinx_dpdma_chan *chan)
751{
752 u32 reg;
753
754 reg = (XILINX_DPDMA_INTR_CHAN_MASK << chan->id)
755 | XILINX_DPDMA_INTR_GLOBAL_MASK;
756 dpdma_write(chan->xdev->reg, XILINX_DPDMA_IEN, reg);
757 reg = (XILINX_DPDMA_EINTR_CHAN_ERR_MASK << chan->id)
758 | XILINX_DPDMA_INTR_GLOBAL_ERR;
759 dpdma_write(chan->xdev->reg, XILINX_DPDMA_EIEN, reg);
760
761 reg = XILINX_DPDMA_CH_CNTL_ENABLE
762 | FIELD_PREP(XILINX_DPDMA_CH_CNTL_QOS_DSCR_WR_MASK,
763 XILINX_DPDMA_CH_CNTL_QOS_VID_CLASS)
764 | FIELD_PREP(XILINX_DPDMA_CH_CNTL_QOS_DSCR_RD_MASK,
765 XILINX_DPDMA_CH_CNTL_QOS_VID_CLASS)
766 | FIELD_PREP(XILINX_DPDMA_CH_CNTL_QOS_DATA_RD_MASK,
767 XILINX_DPDMA_CH_CNTL_QOS_VID_CLASS);
768 dpdma_set(chan->reg, XILINX_DPDMA_CH_CNTL, reg);
769}
770
771/**
772 * xilinx_dpdma_chan_disable - Disable the channel
773 * @chan: DPDMA channel
774 *
775 * Disable the channel and its interrupts.
776 */
777static void xilinx_dpdma_chan_disable(struct xilinx_dpdma_chan *chan)
778{
779 u32 reg;
780
781 reg = XILINX_DPDMA_INTR_CHAN_MASK << chan->id;
782 dpdma_write(chan->xdev->reg, XILINX_DPDMA_IEN, reg);
783 reg = XILINX_DPDMA_EINTR_CHAN_ERR_MASK << chan->id;
784 dpdma_write(chan->xdev->reg, XILINX_DPDMA_EIEN, reg);
785
786 dpdma_clr(chan->reg, XILINX_DPDMA_CH_CNTL, XILINX_DPDMA_CH_CNTL_ENABLE);
787}
788
789/**
790 * xilinx_dpdma_chan_pause - Pause the channel
791 * @chan: DPDMA channel
792 *
793 * Pause the channel.
794 */
795static void xilinx_dpdma_chan_pause(struct xilinx_dpdma_chan *chan)
796{
797 dpdma_set(chan->reg, XILINX_DPDMA_CH_CNTL, XILINX_DPDMA_CH_CNTL_PAUSE);
798}
799
800/**
801 * xilinx_dpdma_chan_unpause - Unpause the channel
802 * @chan: DPDMA channel
803 *
804 * Unpause the channel.
805 */
806static void xilinx_dpdma_chan_unpause(struct xilinx_dpdma_chan *chan)
807{
808 dpdma_clr(chan->reg, XILINX_DPDMA_CH_CNTL, XILINX_DPDMA_CH_CNTL_PAUSE);
809}
810
811static u32 xilinx_dpdma_chan_video_group_ready(struct xilinx_dpdma_chan *chan)
812{
813 struct xilinx_dpdma_device *xdev = chan->xdev;
814 u32 channels = 0;
815 unsigned int i;
816
817 for (i = ZYNQMP_DPDMA_VIDEO0; i <= ZYNQMP_DPDMA_VIDEO2; i++) {
818 if (xdev->chan[i]->video_group && !xdev->chan[i]->running)
819 return 0;
820
821 if (xdev->chan[i]->video_group)
822 channels |= BIT(i);
823 }
824
825 return channels;
826}
827
828/**
829 * xilinx_dpdma_chan_queue_transfer - Queue the next transfer
830 * @chan: DPDMA channel
831 *
832 * Queue the next descriptor, if any, to the hardware. If the channel is
833 * stopped, start it first. Otherwise retrigger it with the next descriptor.
834 */
835static void xilinx_dpdma_chan_queue_transfer(struct xilinx_dpdma_chan *chan)
836{
837 struct xilinx_dpdma_device *xdev = chan->xdev;
838 struct xilinx_dpdma_sw_desc *sw_desc;
839 struct xilinx_dpdma_tx_desc *desc;
840 struct virt_dma_desc *vdesc;
841 u32 reg, channels;
842
843 lockdep_assert_held(&chan->lock);
844
845 if (chan->desc.pending)
846 return;
847
848 if (!chan->running) {
849 xilinx_dpdma_chan_unpause(chan);
850 xilinx_dpdma_chan_enable(chan);
851 chan->first_frame = true;
852 chan->running = true;
853 }
854
855 if (chan->video_group)
856 channels = xilinx_dpdma_chan_video_group_ready(chan);
857 else
858 channels = BIT(chan->id);
859
860 if (!channels)
861 return;
862
863 vdesc = vchan_next_desc(&chan->vchan);
864 if (!vdesc)
865 return;
866
867 desc = to_dpdma_tx_desc(vdesc);
868 chan->desc.pending = desc;
869 list_del(&desc->vdesc.node);
870
871 /*
872 * Assign the cookie to descriptors in this transaction. Only 16 bit
873 * will be used, but it should be enough.
874 */
875 list_for_each_entry(sw_desc, &desc->descriptors, node)
876 sw_desc->hw.desc_id = desc->vdesc.tx.cookie;
877
878 sw_desc = list_first_entry(&desc->descriptors,
879 struct xilinx_dpdma_sw_desc, node);
880 dpdma_write(chan->reg, XILINX_DPDMA_CH_DESC_START_ADDR,
881 lower_32_bits(sw_desc->dma_addr));
882 if (xdev->ext_addr)
883 dpdma_write(chan->reg, XILINX_DPDMA_CH_DESC_START_ADDRE,
884 FIELD_PREP(XILINX_DPDMA_CH_DESC_START_ADDRE_MASK,
885 upper_32_bits(sw_desc->dma_addr)));
886
887 if (chan->first_frame)
888 reg = XILINX_DPDMA_GBL_TRIG_MASK(channels);
889 else
890 reg = XILINX_DPDMA_GBL_RETRIG_MASK(channels);
891
892 chan->first_frame = false;
893
894 dpdma_write(xdev->reg, XILINX_DPDMA_GBL, reg);
895}
896
897/**
898 * xilinx_dpdma_chan_ostand - Number of outstanding transactions
899 * @chan: DPDMA channel
900 *
901 * Read and return the number of outstanding transactions from register.
902 *
903 * Return: Number of outstanding transactions from the status register.
904 */
905static u32 xilinx_dpdma_chan_ostand(struct xilinx_dpdma_chan *chan)
906{
907 return FIELD_GET(XILINX_DPDMA_CH_STATUS_OTRAN_CNT_MASK,
908 dpdma_read(chan->reg, XILINX_DPDMA_CH_STATUS));
909}
910
911/**
912 * xilinx_dpdma_chan_no_ostand - Notify no outstanding transaction event
913 * @chan: DPDMA channel
914 *
915 * Notify waiters for no outstanding event, so waiters can stop the channel
916 * safely. This function is supposed to be called when 'no outstanding'
917 * interrupt is generated. The 'no outstanding' interrupt is disabled and
918 * should be re-enabled when this event is handled. If the channel status
919 * register still shows some number of outstanding transactions, the interrupt
920 * remains enabled.
921 *
922 * Return: 0 on success. On failure, -EWOULDBLOCK if there's still outstanding
923 * transaction(s).
924 */
925static int xilinx_dpdma_chan_notify_no_ostand(struct xilinx_dpdma_chan *chan)
926{
927 u32 cnt;
928
929 cnt = xilinx_dpdma_chan_ostand(chan);
930 if (cnt) {
931 dev_dbg(chan->xdev->dev, "%d outstanding transactions\n", cnt);
932 return -EWOULDBLOCK;
933 }
934
935 /* Disable 'no outstanding' interrupt */
936 dpdma_write(chan->xdev->reg, XILINX_DPDMA_IDS,
937 XILINX_DPDMA_INTR_NO_OSTAND(chan->id));
938 wake_up(&chan->wait_to_stop);
939
940 return 0;
941}
942
943/**
944 * xilinx_dpdma_chan_wait_no_ostand - Wait for the no outstanding irq
945 * @chan: DPDMA channel
946 *
947 * Wait for the no outstanding transaction interrupt. This functions can sleep
948 * for 50ms.
949 *
950 * Return: 0 on success. On failure, -ETIMEOUT for time out, or the error code
951 * from wait_event_interruptible_timeout().
952 */
953static int xilinx_dpdma_chan_wait_no_ostand(struct xilinx_dpdma_chan *chan)
954{
955 int ret;
956
957 /* Wait for a no outstanding transaction interrupt upto 50msec */
958 ret = wait_event_interruptible_timeout(chan->wait_to_stop,
959 !xilinx_dpdma_chan_ostand(chan),
960 msecs_to_jiffies(50));
961 if (ret > 0) {
962 dpdma_write(chan->xdev->reg, XILINX_DPDMA_IEN,
963 XILINX_DPDMA_INTR_NO_OSTAND(chan->id));
964 return 0;
965 }
966
967 dev_err(chan->xdev->dev, "not ready to stop: %d trans\n",
968 xilinx_dpdma_chan_ostand(chan));
969
970 if (ret == 0)
971 return -ETIMEDOUT;
972
973 return ret;
974}
975
976/**
977 * xilinx_dpdma_chan_poll_no_ostand - Poll the outstanding transaction status
978 * @chan: DPDMA channel
979 *
980 * Poll the outstanding transaction status, and return when there's no
981 * outstanding transaction. This functions can be used in the interrupt context
982 * or where the atomicity is required. Calling thread may wait more than 50ms.
983 *
984 * Return: 0 on success, or -ETIMEDOUT.
985 */
986static int xilinx_dpdma_chan_poll_no_ostand(struct xilinx_dpdma_chan *chan)
987{
988 u32 cnt, loop = 50000;
989
990 /* Poll at least for 50ms (20 fps). */
991 do {
992 cnt = xilinx_dpdma_chan_ostand(chan);
993 udelay(1);
994 } while (loop-- > 0 && cnt);
995
996 if (loop) {
997 dpdma_write(chan->xdev->reg, XILINX_DPDMA_IEN,
998 XILINX_DPDMA_INTR_NO_OSTAND(chan->id));
999 return 0;
1000 }
1001
1002 dev_err(chan->xdev->dev, "not ready to stop: %d trans\n",
1003 xilinx_dpdma_chan_ostand(chan));
1004
1005 return -ETIMEDOUT;
1006}
1007
1008/**
1009 * xilinx_dpdma_chan_stop - Stop the channel
1010 * @chan: DPDMA channel
1011 *
1012 * Stop a previously paused channel by first waiting for completion of all
1013 * outstanding transaction and then disabling the channel.
1014 *
1015 * Return: 0 on success, or -ETIMEDOUT if the channel failed to stop.
1016 */
1017static int xilinx_dpdma_chan_stop(struct xilinx_dpdma_chan *chan)
1018{
1019 unsigned long flags;
1020 int ret;
1021
1022 ret = xilinx_dpdma_chan_wait_no_ostand(chan);
1023 if (ret)
1024 return ret;
1025
1026 spin_lock_irqsave(&chan->lock, flags);
1027 xilinx_dpdma_chan_disable(chan);
1028 chan->running = false;
1029 spin_unlock_irqrestore(&chan->lock, flags);
1030
1031 return 0;
1032}
1033
1034/**
1035 * xilinx_dpdma_chan_done_irq - Handle hardware descriptor completion
1036 * @chan: DPDMA channel
1037 *
1038 * Handle completion of the currently active descriptor (@chan->desc.active). As
1039 * we currently support cyclic transfers only, this just invokes the cyclic
1040 * callback. The descriptor will be completed at the VSYNC interrupt when a new
1041 * descriptor replaces it.
1042 */
1043static void xilinx_dpdma_chan_done_irq(struct xilinx_dpdma_chan *chan)
1044{
1045 struct xilinx_dpdma_tx_desc *active = chan->desc.active;
1046 unsigned long flags;
1047
1048 spin_lock_irqsave(&chan->lock, flags);
1049
1d220435
LP		 1050 xilinx_dpdma_debugfs_desc_done_irq(chan);
1051
7cbb0c63
HK		 1052 if (active)
1053 vchan_cyclic_callback(&active->vdesc);
1054 else
1055 dev_warn(chan->xdev->dev,
1056 "DONE IRQ with no active descriptor!\n");
1057
1058 spin_unlock_irqrestore(&chan->lock, flags);
1059}
1060
1061/**
1062 * xilinx_dpdma_chan_vsync_irq - Handle hardware descriptor scheduling
1063 * @chan: DPDMA channel
1064 *
1065 * At VSYNC the active descriptor may have been replaced by the pending
1066 * descriptor. Detect this through the DESC_ID and perform appropriate
1067 * bookkeeping.
1068 */
1069static void xilinx_dpdma_chan_vsync_irq(struct xilinx_dpdma_chan *chan)
1070{
1071 struct xilinx_dpdma_tx_desc *pending;
1072 struct xilinx_dpdma_sw_desc *sw_desc;
1073 unsigned long flags;
1074 u32 desc_id;
1075
1076 spin_lock_irqsave(&chan->lock, flags);
1077
1078 pending = chan->desc.pending;
1079 if (!chan->running || !pending)
1080 goto out;
1081
1082 desc_id = dpdma_read(chan->reg, XILINX_DPDMA_CH_DESC_ID);
1083
1084 /* If the retrigger raced with vsync, retry at the next frame. */
1085 sw_desc = list_first_entry(&pending->descriptors,
1086 struct xilinx_dpdma_sw_desc, node);
1087 if (sw_desc->hw.desc_id != desc_id)
1088 goto out;
1089
1090 /*
1091 * Complete the active descriptor, if any, promote the pending
1092 * descriptor to active, and queue the next transfer, if any.
1093 */
1094 if (chan->desc.active)
1095 vchan_cookie_complete(&chan->desc.active->vdesc);
1096 chan->desc.active = pending;
1097 chan->desc.pending = NULL;
1098
1099 xilinx_dpdma_chan_queue_transfer(chan);
1100
1101out:
1102 spin_unlock_irqrestore(&chan->lock, flags);
1103}
1104
1105/**
1106 * xilinx_dpdma_chan_err - Detect any channel error
1107 * @chan: DPDMA channel
1108 * @isr: masked Interrupt Status Register
1109 * @eisr: Error Interrupt Status Register
1110 *
1111 * Return: true if any channel error occurs, or false otherwise.
1112 */
1113static bool
1114xilinx_dpdma_chan_err(struct xilinx_dpdma_chan *chan, u32 isr, u32 eisr)
1115{
1116 if (!chan)
1117 return false;
1118
1119 if (chan->running &&
1120 ((isr & (XILINX_DPDMA_INTR_CHAN_ERR_MASK << chan->id)) ||
1121 (eisr & (XILINX_DPDMA_EINTR_CHAN_ERR_MASK << chan->id))))
1122 return true;
1123
1124 return false;
1125}
1126
1127/**
1128 * xilinx_dpdma_chan_handle_err - DPDMA channel error handling
1129 * @chan: DPDMA channel
1130 *
1131 * This function is called when any channel error or any global error occurs.
1132 * The function disables the paused channel by errors and determines
1133 * if the current active descriptor can be rescheduled depending on
1134 * the descriptor status.
1135 */
1136static void xilinx_dpdma_chan_handle_err(struct xilinx_dpdma_chan *chan)
1137{
1138 struct xilinx_dpdma_device *xdev = chan->xdev;
1139 struct xilinx_dpdma_tx_desc *active;
1140 unsigned long flags;
1141
1142 spin_lock_irqsave(&chan->lock, flags);
1143
1144 dev_dbg(xdev->dev, "cur desc addr = 0x%04x%08x\n",
1145 dpdma_read(chan->reg, XILINX_DPDMA_CH_DESC_START_ADDRE),
1146 dpdma_read(chan->reg, XILINX_DPDMA_CH_DESC_START_ADDR));
1147 dev_dbg(xdev->dev, "cur payload addr = 0x%04x%08x\n",
1148 dpdma_read(chan->reg, XILINX_DPDMA_CH_PYLD_CUR_ADDRE),
1149 dpdma_read(chan->reg, XILINX_DPDMA_CH_PYLD_CUR_ADDR));
1150
1151 xilinx_dpdma_chan_disable(chan);
1152 chan->running = false;
1153
1154 if (!chan->desc.active)
1155 goto out_unlock;
1156
1157 active = chan->desc.active;
1158 chan->desc.active = NULL;
1159
1160 xilinx_dpdma_chan_dump_tx_desc(chan, active);
1161
1162 if (active->error)
1163 dev_dbg(xdev->dev, "repeated error on desc\n");
1164
1165 /* Reschedule if there's no new descriptor */
1166 if (!chan->desc.pending &&
1167 list_empty(&chan->vchan.desc_issued)) {
1168 active->error = true;
1169 list_add_tail(&active->vdesc.node,
1170 &chan->vchan.desc_issued);
1171 } else {
1172 xilinx_dpdma_chan_free_tx_desc(&active->vdesc);
1173 }
1174
1175out_unlock:
1176 spin_unlock_irqrestore(&chan->lock, flags);
1177}
1178
1179/* -----------------------------------------------------------------------------
1180 * DMA Engine Operations
1181 */
1182
1183static struct dma_async_tx_descriptor *
1184xilinx_dpdma_prep_interleaved_dma(struct dma_chan *dchan,
1185 struct dma_interleaved_template *xt,
1186 unsigned long flags)
1187{
1188 struct xilinx_dpdma_chan *chan = to_xilinx_chan(dchan);
1189 struct xilinx_dpdma_tx_desc *desc;
1190
1191 if (xt->dir != DMA_MEM_TO_DEV)
1192 return NULL;
1193
1194 if (!xt->numf || !xt->sgl[0].size)
1195 return NULL;
1196
1197 if (!(flags & DMA_PREP_REPEAT) || !(flags & DMA_PREP_LOAD_EOT))
1198 return NULL;
1199
1200 desc = xilinx_dpdma_chan_prep_interleaved_dma(chan, xt);
1201 if (!desc)
1202 return NULL;
1203
1204 vchan_tx_prep(&chan->vchan, &desc->vdesc, flags | DMA_CTRL_ACK);
1205
1206 return &desc->vdesc.tx;
1207}
1208
1209/**
1210 * xilinx_dpdma_alloc_chan_resources - Allocate resources for the channel
1211 * @dchan: DMA channel
1212 *
1213 * Allocate a descriptor pool for the channel.
1214 *
1215 * Return: 0 on success, or -ENOMEM if failed to allocate a pool.
1216 */
1217static int xilinx_dpdma_alloc_chan_resources(struct dma_chan *dchan)
1218{
1219 struct xilinx_dpdma_chan *chan = to_xilinx_chan(dchan);
1220 size_t align = __alignof__(struct xilinx_dpdma_sw_desc);
1221
1222 chan->desc_pool = dma_pool_create(dev_name(chan->xdev->dev),
1223 chan->xdev->dev,
1224 sizeof(struct xilinx_dpdma_sw_desc),
1225 align, 0);
1226 if (!chan->desc_pool) {
1227 dev_err(chan->xdev->dev,
1228 "failed to allocate a descriptor pool\n");
1229 return -ENOMEM;
1230 }
1231
1232 return 0;
1233}
1234
1235/**
1236 * xilinx_dpdma_free_chan_resources - Free all resources for the channel
1237 * @dchan: DMA channel
1238 *
1239 * Free resources associated with the virtual DMA channel, and destroy the
1240 * descriptor pool.
1241 */
1242static void xilinx_dpdma_free_chan_resources(struct dma_chan *dchan)
1243{
1244 struct xilinx_dpdma_chan *chan = to_xilinx_chan(dchan);
1245
1246 vchan_free_chan_resources(&chan->vchan);
1247
1248 dma_pool_destroy(chan->desc_pool);
1249 chan->desc_pool = NULL;
1250}
1251
1252static void xilinx_dpdma_issue_pending(struct dma_chan *dchan)
1253{
1254 struct xilinx_dpdma_chan *chan = to_xilinx_chan(dchan);
1255 unsigned long flags;
1256
1257 spin_lock_irqsave(&chan->vchan.lock, flags);
1258 if (vchan_issue_pending(&chan->vchan))
1259 xilinx_dpdma_chan_queue_transfer(chan);
1260 spin_unlock_irqrestore(&chan->vchan.lock, flags);
1261}
1262
1263static int xilinx_dpdma_config(struct dma_chan *dchan,
1264 struct dma_slave_config *config)
1265{
1266 struct xilinx_dpdma_chan *chan = to_xilinx_chan(dchan);
1267 unsigned long flags;
1268
1269 /*
1270 * The destination address doesn't need to be specified as the DPDMA is
1271 * hardwired to the destination (the DP controller). The transfer
1272 * width, burst size and port window size are thus meaningless, they're
1273 * fixed both on the DPDMA side and on the DP controller side.
1274 */
1275
1276 spin_lock_irqsave(&chan->lock, flags);
1277
1278 /*
1279 * Abuse the slave_id to indicate that the channel is part of a video
1280 * group.
1281 */
1c1df908 1282 if (chan->id <= ZYNQMP_DPDMA_VIDEO2)
7cbb0c63
HK		 1283 chan->video_group = config->slave_id != 0;
1284
1285 spin_unlock_irqrestore(&chan->lock, flags);
1286
1287 return 0;
1288}
1289
1290static int xilinx_dpdma_pause(struct dma_chan *dchan)
1291{
1292 xilinx_dpdma_chan_pause(to_xilinx_chan(dchan));
1293
1294 return 0;
1295}
1296
1297static int xilinx_dpdma_resume(struct dma_chan *dchan)
1298{
1299 xilinx_dpdma_chan_unpause(to_xilinx_chan(dchan));
1300
1301 return 0;
1302}
1303
1304/**
1305 * xilinx_dpdma_terminate_all - Terminate the channel and descriptors
1306 * @dchan: DMA channel
1307 *
1308 * Pause the channel without waiting for ongoing transfers to complete. Waiting
1309 * for completion is performed by xilinx_dpdma_synchronize() that will disable
1310 * the channel to complete the stop.
1311 *
1312 * All the descriptors associated with the channel that are guaranteed not to
1313 * be touched by the hardware. The pending and active descriptor are not
1314 * touched, and will be freed either upon completion, or by
1315 * xilinx_dpdma_synchronize().
1316 *
1317 * Return: 0 on success, or -ETIMEDOUT if the channel failed to stop.
1318 */
1319static int xilinx_dpdma_terminate_all(struct dma_chan *dchan)
1320{
1321 struct xilinx_dpdma_chan *chan = to_xilinx_chan(dchan);
1322 struct xilinx_dpdma_device *xdev = chan->xdev;
1323 LIST_HEAD(descriptors);
1324 unsigned long flags;
1325 unsigned int i;
1326
1327 /* Pause the channel (including the whole video group if applicable). */
1328 if (chan->video_group) {
1329 for (i = ZYNQMP_DPDMA_VIDEO0; i <= ZYNQMP_DPDMA_VIDEO2; i++) {
1330 if (xdev->chan[i]->video_group &&
1331 xdev->chan[i]->running) {
1332 xilinx_dpdma_chan_pause(xdev->chan[i]);
1333 xdev->chan[i]->video_group = false;
1334 }
1335 }
1336 } else {
1337 xilinx_dpdma_chan_pause(chan);
1338 }
1339
1340 /* Gather all the descriptors we can free and free them. */
1341 spin_lock_irqsave(&chan->vchan.lock, flags);
1342 vchan_get_all_descriptors(&chan->vchan, &descriptors);
1343 spin_unlock_irqrestore(&chan->vchan.lock, flags);
1344
1345 vchan_dma_desc_free_list(&chan->vchan, &descriptors);
1346
1347 return 0;
1348}
1349
1350/**
1351 * xilinx_dpdma_synchronize - Synchronize callback execution
1352 * @dchan: DMA channel
1353 *
1354 * Synchronizing callback execution ensures that all previously issued
1355 * transfers have completed and all associated callbacks have been called and
1356 * have returned.
1357 *
1358 * This function waits for the DMA channel to stop. It assumes it has been
1359 * paused by a previous call to dmaengine_terminate_async(), and that no new
1360 * pending descriptors have been issued with dma_async_issue_pending(). The
1361 * behaviour is undefined otherwise.
1362 */
1363static void xilinx_dpdma_synchronize(struct dma_chan *dchan)
1364{
1365 struct xilinx_dpdma_chan *chan = to_xilinx_chan(dchan);
1366 unsigned long flags;
1367
1368 xilinx_dpdma_chan_stop(chan);
1369
1370 spin_lock_irqsave(&chan->vchan.lock, flags);
1371 if (chan->desc.pending) {
1372 vchan_terminate_vdesc(&chan->desc.pending->vdesc);
1373 chan->desc.pending = NULL;
1374 }
1375 if (chan->desc.active) {
1376 vchan_terminate_vdesc(&chan->desc.active->vdesc);
1377 chan->desc.active = NULL;
1378 }
1379 spin_unlock_irqrestore(&chan->vchan.lock, flags);
1380
1381 vchan_synchronize(&chan->vchan);
1382}
1383
1384/* -----------------------------------------------------------------------------
1385 * Interrupt and Tasklet Handling
1386 */
1387
1388/**
1389 * xilinx_dpdma_err - Detect any global error
1390 * @isr: Interrupt Status Register
1391 * @eisr: Error Interrupt Status Register
1392 *
1393 * Return: True if any global error occurs, or false otherwise.
1394 */
1395static bool xilinx_dpdma_err(u32 isr, u32 eisr)
1396{
1397 if (isr & XILINX_DPDMA_INTR_GLOBAL_ERR ||
1398 eisr & XILINX_DPDMA_EINTR_GLOBAL_ERR)
1399 return true;
1400
1401 return false;
1402}
1403
1404/**
1405 * xilinx_dpdma_handle_err_irq - Handle DPDMA error interrupt
1406 * @xdev: DPDMA device
1407 * @isr: masked Interrupt Status Register
1408 * @eisr: Error Interrupt Status Register
1409 *
1410 * Handle if any error occurs based on @isr and @eisr. This function disables
1411 * corresponding error interrupts, and those should be re-enabled once handling
1412 * is done.
1413 */
1414static void xilinx_dpdma_handle_err_irq(struct xilinx_dpdma_device *xdev,
1415 u32 isr, u32 eisr)
1416{
1417 bool err = xilinx_dpdma_err(isr, eisr);
1418 unsigned int i;
1419
1420 dev_dbg_ratelimited(xdev->dev,
1421 "error irq: isr = 0x%08x, eisr = 0x%08x\n",
1422 isr, eisr);
1423
1424 /* Disable channel error interrupts until errors are handled. */
1425 dpdma_write(xdev->reg, XILINX_DPDMA_IDS,
1426 isr & ~XILINX_DPDMA_INTR_GLOBAL_ERR);
1427 dpdma_write(xdev->reg, XILINX_DPDMA_EIDS,
1428 eisr & ~XILINX_DPDMA_EINTR_GLOBAL_ERR);
1429
1430 for (i = 0; i < ARRAY_SIZE(xdev->chan); i++)
1431 if (err || xilinx_dpdma_chan_err(xdev->chan[i], isr, eisr))
1432 tasklet_schedule(&xdev->chan[i]->err_task);
1433}
1434
1435/**
1436 * xilinx_dpdma_enable_irq - Enable interrupts
1437 * @xdev: DPDMA device
1438 *
1439 * Enable interrupts.
1440 */
1441static void xilinx_dpdma_enable_irq(struct xilinx_dpdma_device *xdev)
1442{
1443 dpdma_write(xdev->reg, XILINX_DPDMA_IEN, XILINX_DPDMA_INTR_ALL);
1444 dpdma_write(xdev->reg, XILINX_DPDMA_EIEN, XILINX_DPDMA_EINTR_ALL);
1445}
1446
1447/**
1448 * xilinx_dpdma_disable_irq - Disable interrupts
1449 * @xdev: DPDMA device
1450 *
1451 * Disable interrupts.
1452 */
1453static void xilinx_dpdma_disable_irq(struct xilinx_dpdma_device *xdev)
1454{
1455 dpdma_write(xdev->reg, XILINX_DPDMA_IDS, XILINX_DPDMA_INTR_ERR_ALL);
1456 dpdma_write(xdev->reg, XILINX_DPDMA_EIDS, XILINX_DPDMA_EINTR_ALL);
1457}
1458
1459/**
1460 * xilinx_dpdma_chan_err_task - Per channel tasklet for error handling
1461 * @data: tasklet data to be casted to DPDMA channel structure
1462 *
1463 * Per channel error handling tasklet. This function waits for the outstanding
1464 * transaction to complete and triggers error handling. After error handling,
1465 * re-enable channel error interrupts, and restart the channel if needed.
1466 */
1467static void xilinx_dpdma_chan_err_task(unsigned long data)
1468{
1469 struct xilinx_dpdma_chan *chan = (struct xilinx_dpdma_chan *)data;
1470 struct xilinx_dpdma_device *xdev = chan->xdev;
1471 unsigned long flags;
1472
1473 /* Proceed error handling even when polling fails. */
1474 xilinx_dpdma_chan_poll_no_ostand(chan);
1475
1476 xilinx_dpdma_chan_handle_err(chan);
1477
1478 dpdma_write(xdev->reg, XILINX_DPDMA_IEN,
1479 XILINX_DPDMA_INTR_CHAN_ERR_MASK << chan->id);
1480 dpdma_write(xdev->reg, XILINX_DPDMA_EIEN,
1481 XILINX_DPDMA_EINTR_CHAN_ERR_MASK << chan->id);
1482
1483 spin_lock_irqsave(&chan->lock, flags);
1484 xilinx_dpdma_chan_queue_transfer(chan);
1485 spin_unlock_irqrestore(&chan->lock, flags);
1486}
1487
1488static irqreturn_t xilinx_dpdma_irq_handler(int irq, void *data)
1489{
1490 struct xilinx_dpdma_device *xdev = data;
1491 unsigned long mask;
1492 unsigned int i;
1493 u32 status;
1494 u32 error;
1495
1496 status = dpdma_read(xdev->reg, XILINX_DPDMA_ISR);
1497 error = dpdma_read(xdev->reg, XILINX_DPDMA_EISR);
1498 if (!status && !error)
1499 return IRQ_NONE;
1500
1501 dpdma_write(xdev->reg, XILINX_DPDMA_ISR, status);
1502 dpdma_write(xdev->reg, XILINX_DPDMA_EISR, error);
1503
1504 if (status & XILINX_DPDMA_INTR_VSYNC) {
1505 /*
1506 * There's a single VSYNC interrupt that needs to be processed
1507 * by each running channel to update the active descriptor.
1508 */
1509 for (i = 0; i < ARRAY_SIZE(xdev->chan); i++) {
1510 struct xilinx_dpdma_chan *chan = xdev->chan[i];
1511
1512 if (chan)
1513 xilinx_dpdma_chan_vsync_irq(chan);
1514 }
1515 }
1516
1517 mask = FIELD_GET(XILINX_DPDMA_INTR_DESC_DONE_MASK, status);
1518 if (mask) {
1519 for_each_set_bit(i, &mask, ARRAY_SIZE(xdev->chan))
1520 xilinx_dpdma_chan_done_irq(xdev->chan[i]);
1521 }
1522
1523 mask = FIELD_GET(XILINX_DPDMA_INTR_NO_OSTAND_MASK, status);
1524 if (mask) {
1525 for_each_set_bit(i, &mask, ARRAY_SIZE(xdev->chan))
1526 xilinx_dpdma_chan_notify_no_ostand(xdev->chan[i]);
1527 }
1528
1529 mask = status & XILINX_DPDMA_INTR_ERR_ALL;
1530 if (mask || error)
1531 xilinx_dpdma_handle_err_irq(xdev, mask, error);
1532
1533 return IRQ_HANDLED;
1534}
1535
1536/* -----------------------------------------------------------------------------
1537 * Initialization & Cleanup
1538 */
1539
1540static int xilinx_dpdma_chan_init(struct xilinx_dpdma_device *xdev,
1541 unsigned int chan_id)
1542{
1543 struct xilinx_dpdma_chan *chan;
1544
1545 chan = devm_kzalloc(xdev->dev, sizeof(*chan), GFP_KERNEL);
1546 if (!chan)
1547 return -ENOMEM;
1548
1549 chan->id = chan_id;
1550 chan->reg = xdev->reg + XILINX_DPDMA_CH_BASE
1551 + XILINX_DPDMA_CH_OFFSET * chan->id;
1552 chan->running = false;
1553 chan->xdev = xdev;
1554
1555 spin_lock_init(&chan->lock);
1556 init_waitqueue_head(&chan->wait_to_stop);
1557
1558 tasklet_init(&chan->err_task, xilinx_dpdma_chan_err_task,
1559 (unsigned long)chan);
1560
1561 chan->vchan.desc_free = xilinx_dpdma_chan_free_tx_desc;
1562 vchan_init(&chan->vchan, &xdev->common);
1563
1564 xdev->chan[chan->id] = chan;
1565
1566 return 0;
1567}
1568
1569static void xilinx_dpdma_chan_remove(struct xilinx_dpdma_chan *chan)
1570{
1571 if (!chan)
1572 return;
1573
1574 tasklet_kill(&chan->err_task);
1575 list_del(&chan->vchan.chan.device_node);
1576}
1577
1578static struct dma_chan *of_dma_xilinx_xlate(struct of_phandle_args *dma_spec,
1579 struct of_dma *ofdma)
1580{
1581 struct xilinx_dpdma_device *xdev = ofdma->of_dma_data;
1582 uint32_t chan_id = dma_spec->args[0];
1583
1584 if (chan_id >= ARRAY_SIZE(xdev->chan))
1585 return NULL;
1586
1587 if (!xdev->chan[chan_id])
1588 return NULL;
1589
1590 return dma_get_slave_channel(&xdev->chan[chan_id]->vchan.chan);
1591}
1592
1593static int xilinx_dpdma_probe(struct platform_device *pdev)
1594{
1595 struct xilinx_dpdma_device *xdev;
1596 struct dma_device *ddev;
1597 unsigned int i;
1598 int ret;
1599
1600 xdev = devm_kzalloc(&pdev->dev, sizeof(*xdev), GFP_KERNEL);
1601 if (!xdev)
1602 return -ENOMEM;
1603
1604 xdev->dev = &pdev->dev;
1605 xdev->ext_addr = sizeof(dma_addr_t) > 4;
1606
1607 INIT_LIST_HEAD(&xdev->common.channels);
1608
1609 platform_set_drvdata(pdev, xdev);
1610
1611 xdev->axi_clk = devm_clk_get(xdev->dev, "axi_clk");
1612 if (IS_ERR(xdev->axi_clk))
1613 return PTR_ERR(xdev->axi_clk);
1614
1615 xdev->reg = devm_platform_ioremap_resource(pdev, 0);
1616 if (IS_ERR(xdev->reg))
1617 return PTR_ERR(xdev->reg);
1618
1619 xdev->irq = platform_get_irq(pdev, 0);
1620 if (xdev->irq < 0) {
1621 dev_err(xdev->dev, "failed to get platform irq\n");
1622 return xdev->irq;
1623 }
1624
1625 ret = request_irq(xdev->irq, xilinx_dpdma_irq_handler, IRQF_SHARED,
1626 dev_name(xdev->dev), xdev);
1627 if (ret) {
1628 dev_err(xdev->dev, "failed to request IRQ\n");
1629 return ret;
1630 }
1631
1632 ddev = &xdev->common;
1633 ddev->dev = &pdev->dev;
1634
1635 dma_cap_set(DMA_SLAVE, ddev->cap_mask);
1636 dma_cap_set(DMA_PRIVATE, ddev->cap_mask);
1637 dma_cap_set(DMA_INTERLEAVE, ddev->cap_mask);
1638 dma_cap_set(DMA_REPEAT, ddev->cap_mask);
1639 dma_cap_set(DMA_LOAD_EOT, ddev->cap_mask);
1640 ddev->copy_align = fls(XILINX_DPDMA_ALIGN_BYTES - 1);
1641
1642 ddev->device_alloc_chan_resources = xilinx_dpdma_alloc_chan_resources;
1643 ddev->device_free_chan_resources = xilinx_dpdma_free_chan_resources;
1644 ddev->device_prep_interleaved_dma = xilinx_dpdma_prep_interleaved_dma;
1645 /* TODO: Can we achieve better granularity ? */
1646 ddev->device_tx_status = dma_cookie_status;
1647 ddev->device_issue_pending = xilinx_dpdma_issue_pending;
1648 ddev->device_config = xilinx_dpdma_config;
1649 ddev->device_pause = xilinx_dpdma_pause;
1650 ddev->device_resume = xilinx_dpdma_resume;
1651 ddev->device_terminate_all = xilinx_dpdma_terminate_all;
1652 ddev->device_synchronize = xilinx_dpdma_synchronize;
1653 ddev->src_addr_widths = BIT(DMA_SLAVE_BUSWIDTH_UNDEFINED);
1654 ddev->directions = BIT(DMA_MEM_TO_DEV);
1655 ddev->residue_granularity = DMA_RESIDUE_GRANULARITY_DESCRIPTOR;
1656
1657 for (i = 0; i < ARRAY_SIZE(xdev->chan); ++i) {
1658 ret = xilinx_dpdma_chan_init(xdev, i);
1659 if (ret < 0) {
1660 dev_err(xdev->dev, "failed to initialize channel %u\n",
1661 i);
1662 goto error;
1663 }
1664 }
1665
1666 ret = clk_prepare_enable(xdev->axi_clk);
1667 if (ret) {
1668 dev_err(xdev->dev, "failed to enable the axi clock\n");
1669 goto error;
1670 }
1671
1672 ret = dma_async_device_register(ddev);
1673 if (ret) {
1674 dev_err(xdev->dev, "failed to register the dma device\n");
1675 goto error_dma_async;
1676 }
1677
1678 ret = of_dma_controller_register(xdev->dev->of_node,
1679 of_dma_xilinx_xlate, ddev);
1680 if (ret) {
1681 dev_err(xdev->dev, "failed to register DMA to DT DMA helper\n");
1682 goto error_of_dma;
1683 }
1684
1685 xilinx_dpdma_enable_irq(xdev);
1686
1d220435
LP		 1687 xilinx_dpdma_debugfs_init(xdev);
1688
7cbb0c63
HK		 1689 dev_info(&pdev->dev, "Xilinx DPDMA engine is probed\n");
1690
1691 return 0;
1692
1693error_of_dma:
1694 dma_async_device_unregister(ddev);
1695error_dma_async:
1696 clk_disable_unprepare(xdev->axi_clk);
1697error:
1698 for (i = 0; i < ARRAY_SIZE(xdev->chan); i++)
1699 xilinx_dpdma_chan_remove(xdev->chan[i]);
1700
1701 free_irq(xdev->irq, xdev);
1702
1703 return ret;
1704}
1705
1706static int xilinx_dpdma_remove(struct platform_device *pdev)
1707{
1708 struct xilinx_dpdma_device *xdev = platform_get_drvdata(pdev);
1709 unsigned int i;
1710
1711 /* Start by disabling the IRQ to avoid races during cleanup. */
1712 free_irq(xdev->irq, xdev);
1713
1714 xilinx_dpdma_disable_irq(xdev);
1715 of_dma_controller_free(pdev->dev.of_node);
1716 dma_async_device_unregister(&xdev->common);
1717 clk_disable_unprepare(xdev->axi_clk);
1718
1719 for (i = 0; i < ARRAY_SIZE(xdev->chan); i++)
1720 xilinx_dpdma_chan_remove(xdev->chan[i]);
1721
1722 return 0;
1723}
1724
1725static const struct of_device_id xilinx_dpdma_of_match[] = {
1726 { .compatible = "xlnx,zynqmp-dpdma",},
1727 { /* end of table */ },
1728};
1729MODULE_DEVICE_TABLE(of, xilinx_dpdma_of_match);
1730
1731static struct platform_driver xilinx_dpdma_driver = {
1732 .probe = xilinx_dpdma_probe,
1733 .remove = xilinx_dpdma_remove,
1734 .driver = {
1735 .name = "xilinx-zynqmp-dpdma",
1736 .of_match_table = xilinx_dpdma_of_match,
1737 },
1738};
1739
1740module_platform_driver(xilinx_dpdma_driver);
1741
1742MODULE_AUTHOR("Xilinx, Inc.");
1743MODULE_DESCRIPTION("Xilinx ZynqMP DPDMA driver");
1744MODULE_LICENSE("GPL v2");
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