1 // SPDX-License-Identifier: (GPL-2.0 OR BSD-3-Clause)
2 // Copyright(c) 2015-17 Intel Corporation.
3
4 /*
5 * Cadence SoundWire Master module
6 * Used by Master driver
7 */
8
9 #include <linux/delay.h>
10 #include <linux/device.h>
11 #include <linux/debugfs.h>
12 #include <linux/interrupt.h>
13 #include <linux/io.h>
14 #include <linux/module.h>
15 #include <linux/mod_devicetable.h>
16 #include <linux/pm_runtime.h>
17 #include <linux/soundwire/sdw_registers.h>
18 #include <linux/soundwire/sdw.h>
19 #include <sound/pcm_params.h>
20 #include <sound/soc.h>
21 #include <linux/workqueue.h>
22 #include "bus.h"
23 #include "cadence_master.h"
24
25 static int interrupt_mask;
26 module_param_named(cnds_mcp_int_mask, interrupt_mask, int, 0444);
27 MODULE_PARM_DESC(cdns_mcp_int_mask, "Cadence MCP IntMask");
28
29 #define CDNS_MCP_CONFIG 0x0
30
31 #define CDNS_MCP_CONFIG_MCMD_RETRY GENMASK(27, 24)
32 #define CDNS_MCP_CONFIG_MPREQ_DELAY GENMASK(20, 16)
33 #define CDNS_MCP_CONFIG_MMASTER BIT(7)
34 #define CDNS_MCP_CONFIG_BUS_REL BIT(6)
35 #define CDNS_MCP_CONFIG_SNIFFER BIT(5)
36 #define CDNS_MCP_CONFIG_SSPMOD BIT(4)
37 #define CDNS_MCP_CONFIG_CMD BIT(3)
38 #define CDNS_MCP_CONFIG_OP GENMASK(2, 0)
39 #define CDNS_MCP_CONFIG_OP_NORMAL 0
40
41 #define CDNS_MCP_CONTROL 0x4
42
43 #define CDNS_MCP_CONTROL_RST_DELAY GENMASK(10, 8)
44 #define CDNS_MCP_CONTROL_CMD_RST BIT(7)
45 #define CDNS_MCP_CONTROL_SOFT_RST BIT(6)
46 #define CDNS_MCP_CONTROL_SW_RST BIT(5)
47 #define CDNS_MCP_CONTROL_HW_RST BIT(4)
48 #define CDNS_MCP_CONTROL_CLK_PAUSE BIT(3)
49 #define CDNS_MCP_CONTROL_CLK_STOP_CLR BIT(2)
50 #define CDNS_MCP_CONTROL_CMD_ACCEPT BIT(1)
51 #define CDNS_MCP_CONTROL_BLOCK_WAKEUP BIT(0)
52
53 #define CDNS_MCP_CMDCTRL 0x8
54
55 #define CDNS_MCP_CMDCTRL_INSERT_PARITY_ERR BIT(2)
56
57 #define CDNS_MCP_SSPSTAT 0xC
58 #define CDNS_MCP_FRAME_SHAPE 0x10
59 #define CDNS_MCP_FRAME_SHAPE_INIT 0x14
60 #define CDNS_MCP_FRAME_SHAPE_COL_MASK GENMASK(2, 0)
61 #define CDNS_MCP_FRAME_SHAPE_ROW_MASK GENMASK(7, 3)
62
63 #define CDNS_MCP_CONFIG_UPDATE 0x18
64 #define CDNS_MCP_CONFIG_UPDATE_BIT BIT(0)
65
66 #define CDNS_MCP_PHYCTRL 0x1C
67 #define CDNS_MCP_SSP_CTRL0 0x20
68 #define CDNS_MCP_SSP_CTRL1 0x28
69 #define CDNS_MCP_CLK_CTRL0 0x30
70 #define CDNS_MCP_CLK_CTRL1 0x38
71 #define CDNS_MCP_CLK_MCLKD_MASK GENMASK(7, 0)
72
73 #define CDNS_MCP_STAT 0x40
74
75 #define CDNS_MCP_STAT_ACTIVE_BANK BIT(20)
76 #define CDNS_MCP_STAT_CLK_STOP BIT(16)
77
78 #define CDNS_MCP_INTSTAT 0x44
79 #define CDNS_MCP_INTMASK 0x48
80
81 #define CDNS_MCP_INT_IRQ BIT(31)
82 #define CDNS_MCP_INT_RESERVED1 GENMASK(30, 17)
83 #define CDNS_MCP_INT_WAKEUP BIT(16)
84 #define CDNS_MCP_INT_SLAVE_RSVD BIT(15)
85 #define CDNS_MCP_INT_SLAVE_ALERT BIT(14)
86 #define CDNS_MCP_INT_SLAVE_ATTACH BIT(13)
87 #define CDNS_MCP_INT_SLAVE_NATTACH BIT(12)
88 #define CDNS_MCP_INT_SLAVE_MASK GENMASK(15, 12)
89 #define CDNS_MCP_INT_DPINT BIT(11)
90 #define CDNS_MCP_INT_CTRL_CLASH BIT(10)
91 #define CDNS_MCP_INT_DATA_CLASH BIT(9)
92 #define CDNS_MCP_INT_PARITY BIT(8)
93 #define CDNS_MCP_INT_CMD_ERR BIT(7)
94 #define CDNS_MCP_INT_RESERVED2 GENMASK(6, 4)
95 #define CDNS_MCP_INT_RX_NE BIT(3)
96 #define CDNS_MCP_INT_RX_WL BIT(2)
97 #define CDNS_MCP_INT_TXE BIT(1)
98 #define CDNS_MCP_INT_TXF BIT(0)
99 #define CDNS_MCP_INT_RESERVED (CDNS_MCP_INT_RESERVED1 | CDNS_MCP_INT_RESERVED2)
100
101 #define CDNS_MCP_INTSET 0x4C
102
103 #define CDNS_MCP_SLAVE_STAT 0x50
104 #define CDNS_MCP_SLAVE_STAT_MASK GENMASK(1, 0)
105
106 #define CDNS_MCP_SLAVE_INTSTAT0 0x54
107 #define CDNS_MCP_SLAVE_INTSTAT1 0x58
108 #define CDNS_MCP_SLAVE_INTSTAT_NPRESENT BIT(0)
109 #define CDNS_MCP_SLAVE_INTSTAT_ATTACHED BIT(1)
110 #define CDNS_MCP_SLAVE_INTSTAT_ALERT BIT(2)
111 #define CDNS_MCP_SLAVE_INTSTAT_RESERVED BIT(3)
112 #define CDNS_MCP_SLAVE_STATUS_BITS GENMASK(3, 0)
113 #define CDNS_MCP_SLAVE_STATUS_NUM 4
114
115 #define CDNS_MCP_SLAVE_INTMASK0 0x5C
116 #define CDNS_MCP_SLAVE_INTMASK1 0x60
117
118 #define CDNS_MCP_SLAVE_INTMASK0_MASK GENMASK(31, 0)
119 #define CDNS_MCP_SLAVE_INTMASK1_MASK GENMASK(15, 0)
120
121 #define CDNS_MCP_PORT_INTSTAT 0x64
122 #define CDNS_MCP_PDI_STAT 0x6C
123
124 #define CDNS_MCP_FIFOLEVEL 0x78
125 #define CDNS_MCP_FIFOSTAT 0x7C
126 #define CDNS_MCP_RX_FIFO_AVAIL GENMASK(5, 0)
127
128 #define CDNS_MCP_CMD_BASE 0x80
129 #define CDNS_MCP_RESP_BASE 0x80
130 #define CDNS_MCP_CMD_LEN 0x20
131 #define CDNS_MCP_CMD_WORD_LEN 0x4
132
133 #define CDNS_MCP_CMD_SSP_TAG BIT(31)
134 #define CDNS_MCP_CMD_COMMAND GENMASK(30, 28)
135 #define CDNS_MCP_CMD_DEV_ADDR GENMASK(27, 24)
136 #define CDNS_MCP_CMD_REG_ADDR GENMASK(23, 8)
137 #define CDNS_MCP_CMD_REG_DATA GENMASK(7, 0)
138
139 #define CDNS_MCP_CMD_READ 2
140 #define CDNS_MCP_CMD_WRITE 3
141
142 #define CDNS_MCP_RESP_RDATA GENMASK(15, 8)
143 #define CDNS_MCP_RESP_ACK BIT(0)
144 #define CDNS_MCP_RESP_NACK BIT(1)
145
146 #define CDNS_DP_SIZE 128
147
148 #define CDNS_DPN_B0_CONFIG(n) (0x100 + CDNS_DP_SIZE * (n))
149 #define CDNS_DPN_B0_CH_EN(n) (0x104 + CDNS_DP_SIZE * (n))
150 #define CDNS_DPN_B0_SAMPLE_CTRL(n) (0x108 + CDNS_DP_SIZE * (n))
151 #define CDNS_DPN_B0_OFFSET_CTRL(n) (0x10C + CDNS_DP_SIZE * (n))
152 #define CDNS_DPN_B0_HCTRL(n) (0x110 + CDNS_DP_SIZE * (n))
153 #define CDNS_DPN_B0_ASYNC_CTRL(n) (0x114 + CDNS_DP_SIZE * (n))
154
155 #define CDNS_DPN_B1_CONFIG(n) (0x118 + CDNS_DP_SIZE * (n))
156 #define CDNS_DPN_B1_CH_EN(n) (0x11C + CDNS_DP_SIZE * (n))
157 #define CDNS_DPN_B1_SAMPLE_CTRL(n) (0x120 + CDNS_DP_SIZE * (n))
158 #define CDNS_DPN_B1_OFFSET_CTRL(n) (0x124 + CDNS_DP_SIZE * (n))
159 #define CDNS_DPN_B1_HCTRL(n) (0x128 + CDNS_DP_SIZE * (n))
160 #define CDNS_DPN_B1_ASYNC_CTRL(n) (0x12C + CDNS_DP_SIZE * (n))
161
162 #define CDNS_DPN_CONFIG_BPM BIT(18)
163 #define CDNS_DPN_CONFIG_BGC GENMASK(17, 16)
164 #define CDNS_DPN_CONFIG_WL GENMASK(12, 8)
165 #define CDNS_DPN_CONFIG_PORT_DAT GENMASK(3, 2)
166 #define CDNS_DPN_CONFIG_PORT_FLOW GENMASK(1, 0)
167
168 #define CDNS_DPN_SAMPLE_CTRL_SI GENMASK(15, 0)
169
170 #define CDNS_DPN_OFFSET_CTRL_1 GENMASK(7, 0)
171 #define CDNS_DPN_OFFSET_CTRL_2 GENMASK(15, 8)
172
173 #define CDNS_DPN_HCTRL_HSTOP GENMASK(3, 0)
174 #define CDNS_DPN_HCTRL_HSTART GENMASK(7, 4)
175 #define CDNS_DPN_HCTRL_LCTRL GENMASK(10, 8)
176
177 #define CDNS_PORTCTRL 0x130
178 #define CDNS_PORTCTRL_TEST_FAILED BIT(1)
179 #define CDNS_PORTCTRL_DIRN BIT(7)
180 #define CDNS_PORTCTRL_BANK_INVERT BIT(8)
181
182 #define CDNS_PORT_OFFSET 0x80
183
184 #define CDNS_PDI_CONFIG(n) (0x1100 + (n) * 16)
185
186 #define CDNS_PDI_CONFIG_SOFT_RESET BIT(24)
187 #define CDNS_PDI_CONFIG_CHANNEL GENMASK(15, 8)
188 #define CDNS_PDI_CONFIG_PORT GENMASK(4, 0)
189
190 /* Driver defaults */
191 #define CDNS_TX_TIMEOUT 2000
192
193 #define CDNS_SCP_RX_FIFOLEVEL 0x2
194
195 /*
196 * register accessor helpers
197 */
cdns_readl(struct sdw_cdns *cdns, int offset)198 static inline u32 cdns_readl(struct sdw_cdns *cdns, int offset)
199 {
200 return readl(cdns->registers + offset);
201 }
202
cdns_writel(struct sdw_cdns *cdns, int offset, u32 value)203 static inline void cdns_writel(struct sdw_cdns *cdns, int offset, u32 value)
204 {
205 writel(value, cdns->registers + offset);
206 }
207
cdns_updatel(struct sdw_cdns *cdns, int offset, u32 mask, u32 val)208 static inline void cdns_updatel(struct sdw_cdns *cdns,
209 int offset, u32 mask, u32 val)
210 {
211 u32 tmp;
212
213 tmp = cdns_readl(cdns, offset);
214 tmp = (tmp & ~mask) | val;
215 cdns_writel(cdns, offset, tmp);
216 }
217
cdns_set_wait(struct sdw_cdns *cdns, int offset, u32 mask, u32 value)218 static int cdns_set_wait(struct sdw_cdns *cdns, int offset, u32 mask, u32 value)
219 {
220 int timeout = 10;
221 u32 reg_read;
222
223 /* Wait for bit to be set */
224 do {
225 reg_read = readl(cdns->registers + offset);
226 if ((reg_read & mask) == value)
227 return 0;
228
229 timeout--;
230 usleep_range(50, 100);
231 } while (timeout != 0);
232
233 return -ETIMEDOUT;
234 }
235
cdns_clear_bit(struct sdw_cdns *cdns, int offset, u32 value)236 static int cdns_clear_bit(struct sdw_cdns *cdns, int offset, u32 value)
237 {
238 writel(value, cdns->registers + offset);
239
240 /* Wait for bit to be self cleared */
241 return cdns_set_wait(cdns, offset, value, 0);
242 }
243
244 /*
245 * all changes to the MCP_CONFIG, MCP_CONTROL, MCP_CMDCTRL and MCP_PHYCTRL
246 * need to be confirmed with a write to MCP_CONFIG_UPDATE
247 */
cdns_config_update(struct sdw_cdns *cdns)248 static int cdns_config_update(struct sdw_cdns *cdns)
249 {
250 int ret;
251
252 if (sdw_cdns_is_clock_stop(cdns)) {
253 dev_err(cdns->dev, "Cannot program MCP_CONFIG_UPDATE in ClockStopMode\n");
254 return -EINVAL;
255 }
256
257 ret = cdns_clear_bit(cdns, CDNS_MCP_CONFIG_UPDATE,
258 CDNS_MCP_CONFIG_UPDATE_BIT);
259 if (ret < 0)
260 dev_err(cdns->dev, "Config update timedout\n");
261
262 return ret;
263 }
264
265 /*
266 * debugfs
267 */
268 #ifdef CONFIG_DEBUG_FS
269
270 #define RD_BUF (2 * PAGE_SIZE)
271
cdns_sprintf(struct sdw_cdns *cdns, char *buf, size_t pos, unsigned int reg)272 static ssize_t cdns_sprintf(struct sdw_cdns *cdns,
273 char *buf, size_t pos, unsigned int reg)
274 {
275 return scnprintf(buf + pos, RD_BUF - pos,
276 "%4x\t%8x\n", reg, cdns_readl(cdns, reg));
277 }
278
cdns_reg_show(struct seq_file *s, void *data)279 static int cdns_reg_show(struct seq_file *s, void *data)
280 {
281 struct sdw_cdns *cdns = s->private;
282 char *buf;
283 ssize_t ret;
284 int num_ports;
285 int i, j;
286
287 buf = kzalloc(RD_BUF, GFP_KERNEL);
288 if (!buf)
289 return -ENOMEM;
290
291 ret = scnprintf(buf, RD_BUF, "Register Value\n");
292 ret += scnprintf(buf + ret, RD_BUF - ret, "\nMCP Registers\n");
293 /* 8 MCP registers */
294 for (i = CDNS_MCP_CONFIG; i <= CDNS_MCP_PHYCTRL; i += sizeof(u32))
295 ret += cdns_sprintf(cdns, buf, ret, i);
296
297 ret += scnprintf(buf + ret, RD_BUF - ret,
298 "\nStatus & Intr Registers\n");
299 /* 13 Status & Intr registers (offsets 0x70 and 0x74 not defined) */
300 for (i = CDNS_MCP_STAT; i <= CDNS_MCP_FIFOSTAT; i += sizeof(u32))
301 ret += cdns_sprintf(cdns, buf, ret, i);
302
303 ret += scnprintf(buf + ret, RD_BUF - ret,
304 "\nSSP & Clk ctrl Registers\n");
305 ret += cdns_sprintf(cdns, buf, ret, CDNS_MCP_SSP_CTRL0);
306 ret += cdns_sprintf(cdns, buf, ret, CDNS_MCP_SSP_CTRL1);
307 ret += cdns_sprintf(cdns, buf, ret, CDNS_MCP_CLK_CTRL0);
308 ret += cdns_sprintf(cdns, buf, ret, CDNS_MCP_CLK_CTRL1);
309
310 ret += scnprintf(buf + ret, RD_BUF - ret,
311 "\nDPn B0 Registers\n");
312
313 num_ports = cdns->num_ports;
314
315 for (i = 0; i < num_ports; i++) {
316 ret += scnprintf(buf + ret, RD_BUF - ret,
317 "\nDP-%d\n", i);
318 for (j = CDNS_DPN_B0_CONFIG(i);
319 j < CDNS_DPN_B0_ASYNC_CTRL(i); j += sizeof(u32))
320 ret += cdns_sprintf(cdns, buf, ret, j);
321 }
322
323 ret += scnprintf(buf + ret, RD_BUF - ret,
324 "\nDPn B1 Registers\n");
325 for (i = 0; i < num_ports; i++) {
326 ret += scnprintf(buf + ret, RD_BUF - ret,
327 "\nDP-%d\n", i);
328
329 for (j = CDNS_DPN_B1_CONFIG(i);
330 j < CDNS_DPN_B1_ASYNC_CTRL(i); j += sizeof(u32))
331 ret += cdns_sprintf(cdns, buf, ret, j);
332 }
333
334 ret += scnprintf(buf + ret, RD_BUF - ret,
335 "\nDPn Control Registers\n");
336 for (i = 0; i < num_ports; i++)
337 ret += cdns_sprintf(cdns, buf, ret,
338 CDNS_PORTCTRL + i * CDNS_PORT_OFFSET);
339
340 ret += scnprintf(buf + ret, RD_BUF - ret,
341 "\nPDIn Config Registers\n");
342
343 /* number of PDI and ports is interchangeable */
344 for (i = 0; i < num_ports; i++)
345 ret += cdns_sprintf(cdns, buf, ret, CDNS_PDI_CONFIG(i));
346
347 seq_printf(s, "%s", buf);
348 kfree(buf);
349
350 return 0;
351 }
352 DEFINE_SHOW_ATTRIBUTE(cdns_reg);
353
cdns_hw_reset(void *data, u64 value)354 static int cdns_hw_reset(void *data, u64 value)
355 {
356 struct sdw_cdns *cdns = data;
357 int ret;
358
359 if (value != 1)
360 return -EINVAL;
361
362 /* Userspace changed the hardware state behind the kernel's back */
363 add_taint(TAINT_USER, LOCKDEP_STILL_OK);
364
365 ret = sdw_cdns_exit_reset(cdns);
366
367 dev_dbg(cdns->dev, "link hw_reset done: %d\n", ret);
368
369 return ret;
370 }
371
372 DEFINE_DEBUGFS_ATTRIBUTE(cdns_hw_reset_fops, NULL, cdns_hw_reset, "%llu\n");
373
cdns_parity_error_injection(void *data, u64 value)374 static int cdns_parity_error_injection(void *data, u64 value)
375 {
376 struct sdw_cdns *cdns = data;
377 struct sdw_bus *bus;
378 int ret;
379
380 if (value != 1)
381 return -EINVAL;
382
383 bus = &cdns->bus;
384
385 /*
386 * Resume Master device. If this results in a bus reset, the
387 * Slave devices will re-attach and be re-enumerated.
388 */
389 ret = pm_runtime_get_sync(bus->dev);
390 if (ret < 0 && ret != -EACCES) {
391 dev_err_ratelimited(cdns->dev,
392 "pm_runtime_get_sync failed in %s, ret %d\n",
393 __func__, ret);
394 pm_runtime_put_noidle(bus->dev);
395 return ret;
396 }
397
398 /*
399 * wait long enough for Slave(s) to be in steady state. This
400 * does not need to be super precise.
401 */
402 msleep(200);
403
404 /*
405 * Take the bus lock here to make sure that any bus transactions
406 * will be queued while we inject a parity error on a dummy read
407 */
408 mutex_lock(&bus->bus_lock);
409
410 /* program hardware to inject parity error */
411 cdns_updatel(cdns, CDNS_MCP_CMDCTRL,
412 CDNS_MCP_CMDCTRL_INSERT_PARITY_ERR,
413 CDNS_MCP_CMDCTRL_INSERT_PARITY_ERR);
414
415 /* commit changes */
416 cdns_updatel(cdns, CDNS_MCP_CONFIG_UPDATE,
417 CDNS_MCP_CONFIG_UPDATE_BIT,
418 CDNS_MCP_CONFIG_UPDATE_BIT);
419
420 /* do a broadcast dummy read to avoid bus clashes */
421 ret = sdw_bread_no_pm_unlocked(&cdns->bus, 0xf, SDW_SCP_DEVID_0);
422 dev_info(cdns->dev, "parity error injection, read: %d\n", ret);
423
424 /* program hardware to disable parity error */
425 cdns_updatel(cdns, CDNS_MCP_CMDCTRL,
426 CDNS_MCP_CMDCTRL_INSERT_PARITY_ERR,
427 0);
428
429 /* commit changes */
430 cdns_updatel(cdns, CDNS_MCP_CONFIG_UPDATE,
431 CDNS_MCP_CONFIG_UPDATE_BIT,
432 CDNS_MCP_CONFIG_UPDATE_BIT);
433
434 /* Continue bus operation with parity error injection disabled */
435 mutex_unlock(&bus->bus_lock);
436
437 /* Userspace changed the hardware state behind the kernel's back */
438 add_taint(TAINT_USER, LOCKDEP_STILL_OK);
439
440 /*
441 * allow Master device to enter pm_runtime suspend. This may
442 * also result in Slave devices suspending.
443 */
444 pm_runtime_mark_last_busy(bus->dev);
445 pm_runtime_put_autosuspend(bus->dev);
446
447 return 0;
448 }
449
450 DEFINE_DEBUGFS_ATTRIBUTE(cdns_parity_error_fops, NULL,
451 cdns_parity_error_injection, "%llu\n");
452
453 /**
454 * sdw_cdns_debugfs_init() - Cadence debugfs init
455 * @cdns: Cadence instance
456 * @root: debugfs root
457 */
sdw_cdns_debugfs_init(struct sdw_cdns *cdns, struct dentry *root)458 void sdw_cdns_debugfs_init(struct sdw_cdns *cdns, struct dentry *root)
459 {
460 debugfs_create_file("cdns-registers", 0400, root, cdns, &cdns_reg_fops);
461
462 debugfs_create_file("cdns-hw-reset", 0200, root, cdns,
463 &cdns_hw_reset_fops);
464
465 debugfs_create_file("cdns-parity-error-injection", 0200, root, cdns,
466 &cdns_parity_error_fops);
467 }
468 EXPORT_SYMBOL_GPL(sdw_cdns_debugfs_init);
469
470 #endif /* CONFIG_DEBUG_FS */
471
472 /*
473 * IO Calls
474 */
475 static enum sdw_command_response
cdns_fill_msg_resp(struct sdw_cdns *cdns, struct sdw_msg *msg, int count, int offset)476 cdns_fill_msg_resp(struct sdw_cdns *cdns,
477 struct sdw_msg *msg, int count, int offset)
478 {
479 int nack = 0, no_ack = 0;
480 int i;
481
482 /* check message response */
483 for (i = 0; i < count; i++) {
484 if (!(cdns->response_buf[i] & CDNS_MCP_RESP_ACK)) {
485 no_ack = 1;
486 dev_dbg_ratelimited(cdns->dev, "Msg Ack not received\n");
487 }
488 if (cdns->response_buf[i] & CDNS_MCP_RESP_NACK) {
489 nack = 1;
490 dev_err_ratelimited(cdns->dev, "Msg NACK received\n");
491 }
492 }
493
494 if (nack) {
495 dev_err_ratelimited(cdns->dev, "Msg NACKed for Slave %d\n", msg->dev_num);
496 return SDW_CMD_FAIL;
497 }
498
499 if (no_ack) {
500 dev_dbg_ratelimited(cdns->dev, "Msg ignored for Slave %d\n", msg->dev_num);
501 return SDW_CMD_IGNORED;
502 }
503
504 if (msg->flags == SDW_MSG_FLAG_READ) {
505 /* fill response */
506 for (i = 0; i < count; i++)
507 msg->buf[i + offset] = FIELD_GET(CDNS_MCP_RESP_RDATA,
508 cdns->response_buf[i]);
509 }
510
511 return SDW_CMD_OK;
512 }
513
cdns_read_response(struct sdw_cdns *cdns)514 static void cdns_read_response(struct sdw_cdns *cdns)
515 {
516 u32 num_resp, cmd_base;
517 int i;
518
519 /* RX_FIFO_AVAIL can be 2 entries more than the FIFO size */
520 BUILD_BUG_ON(ARRAY_SIZE(cdns->response_buf) < CDNS_MCP_CMD_LEN + 2);
521
522 num_resp = cdns_readl(cdns, CDNS_MCP_FIFOSTAT);
523 num_resp &= CDNS_MCP_RX_FIFO_AVAIL;
524 if (num_resp > ARRAY_SIZE(cdns->response_buf)) {
525 dev_warn(cdns->dev, "RX AVAIL %d too long\n", num_resp);
526 num_resp = ARRAY_SIZE(cdns->response_buf);
527 }
528
529 cmd_base = CDNS_MCP_CMD_BASE;
530
531 for (i = 0; i < num_resp; i++) {
532 cdns->response_buf[i] = cdns_readl(cdns, cmd_base);
533 cmd_base += CDNS_MCP_CMD_WORD_LEN;
534 }
535 }
536
537 static enum sdw_command_response
_cdns_xfer_msg(struct sdw_cdns *cdns, struct sdw_msg *msg, int cmd, int offset, int count, bool defer)538 _cdns_xfer_msg(struct sdw_cdns *cdns, struct sdw_msg *msg, int cmd,
539 int offset, int count, bool defer)
540 {
541 unsigned long time;
542 u32 base, i, data;
543 u16 addr;
544
545 /* Program the watermark level for RX FIFO */
546 if (cdns->msg_count != count) {
547 cdns_writel(cdns, CDNS_MCP_FIFOLEVEL, count);
548 cdns->msg_count = count;
549 }
550
551 base = CDNS_MCP_CMD_BASE;
552 addr = msg->addr;
553
554 for (i = 0; i < count; i++) {
555 data = FIELD_PREP(CDNS_MCP_CMD_DEV_ADDR, msg->dev_num);
556 data |= FIELD_PREP(CDNS_MCP_CMD_COMMAND, cmd);
557 data |= FIELD_PREP(CDNS_MCP_CMD_REG_ADDR, addr);
558 addr++;
559
560 if (msg->flags == SDW_MSG_FLAG_WRITE)
561 data |= msg->buf[i + offset];
562
563 data |= FIELD_PREP(CDNS_MCP_CMD_SSP_TAG, msg->ssp_sync);
564 cdns_writel(cdns, base, data);
565 base += CDNS_MCP_CMD_WORD_LEN;
566 }
567
568 if (defer)
569 return SDW_CMD_OK;
570
571 /* wait for timeout or response */
572 time = wait_for_completion_timeout(&cdns->tx_complete,
573 msecs_to_jiffies(CDNS_TX_TIMEOUT));
574 if (!time) {
575 dev_err(cdns->dev, "IO transfer timed out, cmd %d device %d addr %x len %d\n",
576 cmd, msg->dev_num, msg->addr, msg->len);
577 msg->len = 0;
578
579 /* Drain anything in the RX_FIFO */
580 cdns_read_response(cdns);
581
582 return SDW_CMD_TIMEOUT;
583 }
584
585 return cdns_fill_msg_resp(cdns, msg, count, offset);
586 }
587
588 static enum sdw_command_response
cdns_program_scp_addr(struct sdw_cdns *cdns, struct sdw_msg *msg)589 cdns_program_scp_addr(struct sdw_cdns *cdns, struct sdw_msg *msg)
590 {
591 int nack = 0, no_ack = 0;
592 unsigned long time;
593 u32 data[2], base;
594 int i;
595
596 /* Program the watermark level for RX FIFO */
597 if (cdns->msg_count != CDNS_SCP_RX_FIFOLEVEL) {
598 cdns_writel(cdns, CDNS_MCP_FIFOLEVEL, CDNS_SCP_RX_FIFOLEVEL);
599 cdns->msg_count = CDNS_SCP_RX_FIFOLEVEL;
600 }
601
602 data[0] = FIELD_PREP(CDNS_MCP_CMD_DEV_ADDR, msg->dev_num);
603 data[0] |= FIELD_PREP(CDNS_MCP_CMD_COMMAND, 0x3);
604 data[1] = data[0];
605
606 data[0] |= FIELD_PREP(CDNS_MCP_CMD_REG_ADDR, SDW_SCP_ADDRPAGE1);
607 data[1] |= FIELD_PREP(CDNS_MCP_CMD_REG_ADDR, SDW_SCP_ADDRPAGE2);
608
609 data[0] |= msg->addr_page1;
610 data[1] |= msg->addr_page2;
611
612 base = CDNS_MCP_CMD_BASE;
613 cdns_writel(cdns, base, data[0]);
614 base += CDNS_MCP_CMD_WORD_LEN;
615 cdns_writel(cdns, base, data[1]);
616
617 time = wait_for_completion_timeout(&cdns->tx_complete,
618 msecs_to_jiffies(CDNS_TX_TIMEOUT));
619 if (!time) {
620 dev_err(cdns->dev, "SCP Msg trf timed out\n");
621 msg->len = 0;
622 return SDW_CMD_TIMEOUT;
623 }
624
625 /* check response the writes */
626 for (i = 0; i < 2; i++) {
627 if (!(cdns->response_buf[i] & CDNS_MCP_RESP_ACK)) {
628 no_ack = 1;
629 dev_err(cdns->dev, "Program SCP Ack not received\n");
630 if (cdns->response_buf[i] & CDNS_MCP_RESP_NACK) {
631 nack = 1;
632 dev_err(cdns->dev, "Program SCP NACK received\n");
633 }
634 }
635 }
636
637 /* For NACK, NO ack, don't return err if we are in Broadcast mode */
638 if (nack) {
639 dev_err_ratelimited(cdns->dev,
640 "SCP_addrpage NACKed for Slave %d\n", msg->dev_num);
641 return SDW_CMD_FAIL;
642 }
643
644 if (no_ack) {
645 dev_dbg_ratelimited(cdns->dev,
646 "SCP_addrpage ignored for Slave %d\n", msg->dev_num);
647 return SDW_CMD_IGNORED;
648 }
649
650 return SDW_CMD_OK;
651 }
652
cdns_prep_msg(struct sdw_cdns *cdns, struct sdw_msg *msg, int *cmd)653 static int cdns_prep_msg(struct sdw_cdns *cdns, struct sdw_msg *msg, int *cmd)
654 {
655 int ret;
656
657 if (msg->page) {
658 ret = cdns_program_scp_addr(cdns, msg);
659 if (ret) {
660 msg->len = 0;
661 return ret;
662 }
663 }
664
665 switch (msg->flags) {
666 case SDW_MSG_FLAG_READ:
667 *cmd = CDNS_MCP_CMD_READ;
668 break;
669
670 case SDW_MSG_FLAG_WRITE:
671 *cmd = CDNS_MCP_CMD_WRITE;
672 break;
673
674 default:
675 dev_err(cdns->dev, "Invalid msg cmd: %d\n", msg->flags);
676 return -EINVAL;
677 }
678
679 return 0;
680 }
681
682 enum sdw_command_response
cdns_xfer_msg(struct sdw_bus *bus, struct sdw_msg *msg)683 cdns_xfer_msg(struct sdw_bus *bus, struct sdw_msg *msg)
684 {
685 struct sdw_cdns *cdns = bus_to_cdns(bus);
686 int cmd = 0, ret, i;
687
688 ret = cdns_prep_msg(cdns, msg, &cmd);
689 if (ret)
690 return SDW_CMD_FAIL_OTHER;
691
692 for (i = 0; i < msg->len / CDNS_MCP_CMD_LEN; i++) {
693 ret = _cdns_xfer_msg(cdns, msg, cmd, i * CDNS_MCP_CMD_LEN,
694 CDNS_MCP_CMD_LEN, false);
695 if (ret < 0)
696 goto exit;
697 }
698
699 if (!(msg->len % CDNS_MCP_CMD_LEN))
700 goto exit;
701
702 ret = _cdns_xfer_msg(cdns, msg, cmd, i * CDNS_MCP_CMD_LEN,
703 msg->len % CDNS_MCP_CMD_LEN, false);
704
705 exit:
706 return ret;
707 }
708 EXPORT_SYMBOL(cdns_xfer_msg);
709
710 enum sdw_command_response
cdns_xfer_msg_defer(struct sdw_bus *bus, struct sdw_msg *msg, struct sdw_defer *defer)711 cdns_xfer_msg_defer(struct sdw_bus *bus,
712 struct sdw_msg *msg, struct sdw_defer *defer)
713 {
714 struct sdw_cdns *cdns = bus_to_cdns(bus);
715 int cmd = 0, ret;
716
717 /* for defer only 1 message is supported */
718 if (msg->len > 1)
719 return -ENOTSUPP;
720
721 ret = cdns_prep_msg(cdns, msg, &cmd);
722 if (ret)
723 return SDW_CMD_FAIL_OTHER;
724
725 cdns->defer = defer;
726 cdns->defer->length = msg->len;
727
728 return _cdns_xfer_msg(cdns, msg, cmd, 0, msg->len, true);
729 }
730 EXPORT_SYMBOL(cdns_xfer_msg_defer);
731
732 enum sdw_command_response
cdns_reset_page_addr(struct sdw_bus *bus, unsigned int dev_num)733 cdns_reset_page_addr(struct sdw_bus *bus, unsigned int dev_num)
734 {
735 struct sdw_cdns *cdns = bus_to_cdns(bus);
736 struct sdw_msg msg;
737
738 /* Create dummy message with valid device number */
739 memset(&msg, 0, sizeof(msg));
740 msg.dev_num = dev_num;
741
742 return cdns_program_scp_addr(cdns, &msg);
743 }
744 EXPORT_SYMBOL(cdns_reset_page_addr);
745
746 /*
747 * IRQ handling
748 */
749
cdns_update_slave_status(struct sdw_cdns *cdns, u32 slave0, u32 slave1)750 static int cdns_update_slave_status(struct sdw_cdns *cdns,
751 u32 slave0, u32 slave1)
752 {
753 enum sdw_slave_status status[SDW_MAX_DEVICES + 1];
754 bool is_slave = false;
755 u64 slave;
756 u32 mask;
757 int i, set_status;
758
759 /* combine the two status */
760 slave = ((u64)slave1 << 32) | slave0;
761 memset(status, 0, sizeof(status));
762
763 for (i = 0; i <= SDW_MAX_DEVICES; i++) {
764 mask = (slave >> (i * CDNS_MCP_SLAVE_STATUS_NUM)) &
765 CDNS_MCP_SLAVE_STATUS_BITS;
766 if (!mask)
767 continue;
768
769 is_slave = true;
770 set_status = 0;
771
772 if (mask & CDNS_MCP_SLAVE_INTSTAT_RESERVED) {
773 status[i] = SDW_SLAVE_RESERVED;
774 set_status++;
775 }
776
777 if (mask & CDNS_MCP_SLAVE_INTSTAT_ATTACHED) {
778 status[i] = SDW_SLAVE_ATTACHED;
779 set_status++;
780 }
781
782 if (mask & CDNS_MCP_SLAVE_INTSTAT_ALERT) {
783 status[i] = SDW_SLAVE_ALERT;
784 set_status++;
785 }
786
787 if (mask & CDNS_MCP_SLAVE_INTSTAT_NPRESENT) {
788 status[i] = SDW_SLAVE_UNATTACHED;
789 set_status++;
790 }
791
792 /* first check if Slave reported multiple status */
793 if (set_status > 1) {
794 u32 val;
795
796 dev_warn_ratelimited(cdns->dev,
797 "Slave %d reported multiple Status: %d\n",
798 i, mask);
799
800 /* check latest status extracted from PING commands */
801 val = cdns_readl(cdns, CDNS_MCP_SLAVE_STAT);
802 val >>= (i * 2);
803
804 switch (val & 0x3) {
805 case 0:
806 status[i] = SDW_SLAVE_UNATTACHED;
807 break;
808 case 1:
809 status[i] = SDW_SLAVE_ATTACHED;
810 break;
811 case 2:
812 status[i] = SDW_SLAVE_ALERT;
813 break;
814 case 3:
815 default:
816 status[i] = SDW_SLAVE_RESERVED;
817 break;
818 }
819
820 dev_warn_ratelimited(cdns->dev,
821 "Slave %d status updated to %d\n",
822 i, status[i]);
823
824 }
825 }
826
827 if (is_slave)
828 return sdw_handle_slave_status(&cdns->bus, status);
829
830 return 0;
831 }
832
833 /**
834 * sdw_cdns_irq() - Cadence interrupt handler
835 * @irq: irq number
836 * @dev_id: irq context
837 */
sdw_cdns_irq(int irq, void *dev_id)838 irqreturn_t sdw_cdns_irq(int irq, void *dev_id)
839 {
840 struct sdw_cdns *cdns = dev_id;
841 u32 int_status;
842 int ret = IRQ_HANDLED;
843
844 /* Check if the link is up */
845 if (!cdns->link_up)
846 return IRQ_NONE;
847
848 int_status = cdns_readl(cdns, CDNS_MCP_INTSTAT);
849
850 /* check for reserved values read as zero */
851 if (int_status & CDNS_MCP_INT_RESERVED)
852 return IRQ_NONE;
853
854 if (!(int_status & CDNS_MCP_INT_IRQ))
855 return IRQ_NONE;
856
857 if (int_status & CDNS_MCP_INT_RX_WL) {
858 cdns_read_response(cdns);
859
860 if (cdns->defer) {
861 cdns_fill_msg_resp(cdns, cdns->defer->msg,
862 cdns->defer->length, 0);
863 complete(&cdns->defer->complete);
864 cdns->defer = NULL;
865 } else {
866 complete(&cdns->tx_complete);
867 }
868 }
869
870 if (int_status & CDNS_MCP_INT_PARITY) {
871 /* Parity error detected by Master */
872 dev_err_ratelimited(cdns->dev, "Parity error\n");
873 }
874
875 if (int_status & CDNS_MCP_INT_CTRL_CLASH) {
876 /* Slave is driving bit slot during control word */
877 dev_err_ratelimited(cdns->dev, "Bus clash for control word\n");
878 }
879
880 if (int_status & CDNS_MCP_INT_DATA_CLASH) {
881 /*
882 * Multiple slaves trying to drive bit slot, or issue with
883 * ownership of data bits or Slave gone bonkers
884 */
885 dev_err_ratelimited(cdns->dev, "Bus clash for data word\n");
886 }
887
888 if (cdns->bus.params.m_data_mode != SDW_PORT_DATA_MODE_NORMAL &&
889 int_status & CDNS_MCP_INT_DPINT) {
890 u32 port_intstat;
891
892 /* just log which ports report an error */
893 port_intstat = cdns_readl(cdns, CDNS_MCP_PORT_INTSTAT);
894 dev_err_ratelimited(cdns->dev, "DP interrupt: PortIntStat %8x\n",
895 port_intstat);
896
897 /* clear status w/ write1 */
898 cdns_writel(cdns, CDNS_MCP_PORT_INTSTAT, port_intstat);
899 }
900
901 if (int_status & CDNS_MCP_INT_SLAVE_MASK) {
902 /* Mask the Slave interrupt and wake thread */
903 cdns_updatel(cdns, CDNS_MCP_INTMASK,
904 CDNS_MCP_INT_SLAVE_MASK, 0);
905
906 int_status &= ~CDNS_MCP_INT_SLAVE_MASK;
907
908 /*
909 * Deal with possible race condition between interrupt
910 * handling and disabling interrupts on suspend.
911 *
912 * If the master is in the process of disabling
913 * interrupts, don't schedule a workqueue
914 */
915 if (cdns->interrupt_enabled)
916 schedule_work(&cdns->work);
917 }
918
919 cdns_writel(cdns, CDNS_MCP_INTSTAT, int_status);
920 return ret;
921 }
922 EXPORT_SYMBOL(sdw_cdns_irq);
923
924 /**
925 * To update slave status in a work since we will need to handle
926 * other interrupts eg. CDNS_MCP_INT_RX_WL during the update slave
927 * process.
928 * @work: cdns worker thread
929 */
cdns_update_slave_status_work(struct work_struct *work)930 static void cdns_update_slave_status_work(struct work_struct *work)
931 {
932 struct sdw_cdns *cdns =
933 container_of(work, struct sdw_cdns, work);
934 u32 slave0, slave1;
935
936 dev_dbg_ratelimited(cdns->dev, "Slave status change\n");
937
938 slave0 = cdns_readl(cdns, CDNS_MCP_SLAVE_INTSTAT0);
939 slave1 = cdns_readl(cdns, CDNS_MCP_SLAVE_INTSTAT1);
940
941 cdns_update_slave_status(cdns, slave0, slave1);
942 cdns_writel(cdns, CDNS_MCP_SLAVE_INTSTAT0, slave0);
943 cdns_writel(cdns, CDNS_MCP_SLAVE_INTSTAT1, slave1);
944
945 /* clear and unmask Slave interrupt now */
946 cdns_writel(cdns, CDNS_MCP_INTSTAT, CDNS_MCP_INT_SLAVE_MASK);
947 cdns_updatel(cdns, CDNS_MCP_INTMASK,
948 CDNS_MCP_INT_SLAVE_MASK, CDNS_MCP_INT_SLAVE_MASK);
949
950 }
951
952 /*
953 * init routines
954 */
955
956 /**
957 * sdw_cdns_exit_reset() - Program reset parameters and start bus operations
958 * @cdns: Cadence instance
959 */
sdw_cdns_exit_reset(struct sdw_cdns *cdns)960 int sdw_cdns_exit_reset(struct sdw_cdns *cdns)
961 {
962 /* program maximum length reset to be safe */
963 cdns_updatel(cdns, CDNS_MCP_CONTROL,
964 CDNS_MCP_CONTROL_RST_DELAY,
965 CDNS_MCP_CONTROL_RST_DELAY);
966
967 /* use hardware generated reset */
968 cdns_updatel(cdns, CDNS_MCP_CONTROL,
969 CDNS_MCP_CONTROL_HW_RST,
970 CDNS_MCP_CONTROL_HW_RST);
971
972 /* commit changes */
973 cdns_updatel(cdns, CDNS_MCP_CONFIG_UPDATE,
974 CDNS_MCP_CONFIG_UPDATE_BIT,
975 CDNS_MCP_CONFIG_UPDATE_BIT);
976
977 /* don't wait here */
978 return 0;
979
980 }
981 EXPORT_SYMBOL(sdw_cdns_exit_reset);
982
983 /**
984 * sdw_cdns_enable_slave_interrupt() - Enable SDW slave interrupts
985 * @cdns: Cadence instance
986 * @state: boolean for true/false
987 */
cdns_enable_slave_interrupts(struct sdw_cdns *cdns, bool state)988 static void cdns_enable_slave_interrupts(struct sdw_cdns *cdns, bool state)
989 {
990 u32 mask;
991
992 mask = cdns_readl(cdns, CDNS_MCP_INTMASK);
993 if (state)
994 mask |= CDNS_MCP_INT_SLAVE_MASK;
995 else
996 mask &= ~CDNS_MCP_INT_SLAVE_MASK;
997
998 cdns_writel(cdns, CDNS_MCP_INTMASK, mask);
999 }
1000
1001 /**
1002 * sdw_cdns_enable_interrupt() - Enable SDW interrupts
1003 * @cdns: Cadence instance
1004 * @state: True if we are trying to enable interrupt.
1005 */
sdw_cdns_enable_interrupt(struct sdw_cdns *cdns, bool state)1006 int sdw_cdns_enable_interrupt(struct sdw_cdns *cdns, bool state)
1007 {
1008 u32 slave_intmask0 = 0;
1009 u32 slave_intmask1 = 0;
1010 u32 mask = 0;
1011
1012 if (!state)
1013 goto update_masks;
1014
1015 slave_intmask0 = CDNS_MCP_SLAVE_INTMASK0_MASK;
1016 slave_intmask1 = CDNS_MCP_SLAVE_INTMASK1_MASK;
1017
1018 /* enable detection of all slave state changes */
1019 mask = CDNS_MCP_INT_SLAVE_MASK;
1020
1021 /* enable detection of bus issues */
1022 mask |= CDNS_MCP_INT_CTRL_CLASH | CDNS_MCP_INT_DATA_CLASH |
1023 CDNS_MCP_INT_PARITY;
1024
1025 /* port interrupt limited to test modes for now */
1026 if (cdns->bus.params.m_data_mode != SDW_PORT_DATA_MODE_NORMAL)
1027 mask |= CDNS_MCP_INT_DPINT;
1028
1029 /* enable detection of RX fifo level */
1030 mask |= CDNS_MCP_INT_RX_WL;
1031
1032 /*
1033 * CDNS_MCP_INT_IRQ needs to be set otherwise all previous
1034 * settings are irrelevant
1035 */
1036 mask |= CDNS_MCP_INT_IRQ;
1037
1038 if (interrupt_mask) /* parameter override */
1039 mask = interrupt_mask;
1040
1041 update_masks:
1042 /* clear slave interrupt status before enabling interrupt */
1043 if (state) {
1044 u32 slave_state;
1045
1046 slave_state = cdns_readl(cdns, CDNS_MCP_SLAVE_INTSTAT0);
1047 cdns_writel(cdns, CDNS_MCP_SLAVE_INTSTAT0, slave_state);
1048 slave_state = cdns_readl(cdns, CDNS_MCP_SLAVE_INTSTAT1);
1049 cdns_writel(cdns, CDNS_MCP_SLAVE_INTSTAT1, slave_state);
1050 }
1051 cdns->interrupt_enabled = state;
1052
1053 /*
1054 * Complete any on-going status updates before updating masks,
1055 * and cancel queued status updates.
1056 *
1057 * There could be a race with a new interrupt thrown before
1058 * the 3 mask updates below are complete, so in the interrupt
1059 * we use the 'interrupt_enabled' status to prevent new work
1060 * from being queued.
1061 */
1062 if (!state)
1063 cancel_work_sync(&cdns->work);
1064
1065 cdns_writel(cdns, CDNS_MCP_SLAVE_INTMASK0, slave_intmask0);
1066 cdns_writel(cdns, CDNS_MCP_SLAVE_INTMASK1, slave_intmask1);
1067 cdns_writel(cdns, CDNS_MCP_INTMASK, mask);
1068
1069 return 0;
1070 }
1071 EXPORT_SYMBOL(sdw_cdns_enable_interrupt);
1072
cdns_allocate_pdi(struct sdw_cdns *cdns, struct sdw_cdns_pdi **stream, u32 num, u32 pdi_offset)1073 static int cdns_allocate_pdi(struct sdw_cdns *cdns,
1074 struct sdw_cdns_pdi **stream,
1075 u32 num, u32 pdi_offset)
1076 {
1077 struct sdw_cdns_pdi *pdi;
1078 int i;
1079
1080 if (!num)
1081 return 0;
1082
1083 pdi = devm_kcalloc(cdns->dev, num, sizeof(*pdi), GFP_KERNEL);
1084 if (!pdi)
1085 return -ENOMEM;
1086
1087 for (i = 0; i < num; i++) {
1088 pdi[i].num = i + pdi_offset;
1089 }
1090
1091 *stream = pdi;
1092 return 0;
1093 }
1094
1095 /**
1096 * sdw_cdns_pdi_init() - PDI initialization routine
1097 *
1098 * @cdns: Cadence instance
1099 * @config: Stream configurations
1100 */
sdw_cdns_pdi_init(struct sdw_cdns *cdns, struct sdw_cdns_stream_config config)1101 int sdw_cdns_pdi_init(struct sdw_cdns *cdns,
1102 struct sdw_cdns_stream_config config)
1103 {
1104 struct sdw_cdns_streams *stream;
1105 int offset;
1106 int ret;
1107
1108 cdns->pcm.num_bd = config.pcm_bd;
1109 cdns->pcm.num_in = config.pcm_in;
1110 cdns->pcm.num_out = config.pcm_out;
1111 cdns->pdm.num_bd = config.pdm_bd;
1112 cdns->pdm.num_in = config.pdm_in;
1113 cdns->pdm.num_out = config.pdm_out;
1114
1115 /* Allocate PDIs for PCMs */
1116 stream = &cdns->pcm;
1117
1118 /* we allocate PDI0 and PDI1 which are used for Bulk */
1119 offset = 0;
1120
1121 ret = cdns_allocate_pdi(cdns, &stream->bd,
1122 stream->num_bd, offset);
1123 if (ret)
1124 return ret;
1125
1126 offset += stream->num_bd;
1127
1128 ret = cdns_allocate_pdi(cdns, &stream->in,
1129 stream->num_in, offset);
1130 if (ret)
1131 return ret;
1132
1133 offset += stream->num_in;
1134
1135 ret = cdns_allocate_pdi(cdns, &stream->out,
1136 stream->num_out, offset);
1137 if (ret)
1138 return ret;
1139
1140 /* Update total number of PCM PDIs */
1141 stream->num_pdi = stream->num_bd + stream->num_in + stream->num_out;
1142 cdns->num_ports = stream->num_pdi;
1143
1144 /* Allocate PDIs for PDMs */
1145 stream = &cdns->pdm;
1146 ret = cdns_allocate_pdi(cdns, &stream->bd,
1147 stream->num_bd, offset);
1148 if (ret)
1149 return ret;
1150
1151 offset += stream->num_bd;
1152
1153 ret = cdns_allocate_pdi(cdns, &stream->in,
1154 stream->num_in, offset);
1155 if (ret)
1156 return ret;
1157
1158 offset += stream->num_in;
1159
1160 ret = cdns_allocate_pdi(cdns, &stream->out,
1161 stream->num_out, offset);
1162
1163 if (ret)
1164 return ret;
1165
1166 /* Update total number of PDM PDIs */
1167 stream->num_pdi = stream->num_bd + stream->num_in + stream->num_out;
1168 cdns->num_ports += stream->num_pdi;
1169
1170 return 0;
1171 }
1172 EXPORT_SYMBOL(sdw_cdns_pdi_init);
1173
cdns_set_initial_frame_shape(int n_rows, int n_cols)1174 static u32 cdns_set_initial_frame_shape(int n_rows, int n_cols)
1175 {
1176 u32 val;
1177 int c;
1178 int r;
1179
1180 r = sdw_find_row_index(n_rows);
1181 c = sdw_find_col_index(n_cols);
1182
1183 val = FIELD_PREP(CDNS_MCP_FRAME_SHAPE_ROW_MASK, r);
1184 val |= FIELD_PREP(CDNS_MCP_FRAME_SHAPE_COL_MASK, c);
1185
1186 return val;
1187 }
1188
cdns_init_clock_ctrl(struct sdw_cdns *cdns)1189 static void cdns_init_clock_ctrl(struct sdw_cdns *cdns)
1190 {
1191 struct sdw_bus *bus = &cdns->bus;
1192 struct sdw_master_prop *prop = &bus->prop;
1193 u32 val;
1194 u32 ssp_interval;
1195 int divider;
1196
1197 /* Set clock divider */
1198 divider = (prop->mclk_freq / prop->max_clk_freq) - 1;
1199
1200 cdns_updatel(cdns, CDNS_MCP_CLK_CTRL0,
1201 CDNS_MCP_CLK_MCLKD_MASK, divider);
1202 cdns_updatel(cdns, CDNS_MCP_CLK_CTRL1,
1203 CDNS_MCP_CLK_MCLKD_MASK, divider);
1204
1205 /*
1206 * Frame shape changes after initialization have to be done
1207 * with the bank switch mechanism
1208 */
1209 val = cdns_set_initial_frame_shape(prop->default_row,
1210 prop->default_col);
1211 cdns_writel(cdns, CDNS_MCP_FRAME_SHAPE_INIT, val);
1212
1213 /* Set SSP interval to default value */
1214 ssp_interval = prop->default_frame_rate / SDW_CADENCE_GSYNC_HZ;
1215 cdns_writel(cdns, CDNS_MCP_SSP_CTRL0, ssp_interval);
1216 cdns_writel(cdns, CDNS_MCP_SSP_CTRL1, ssp_interval);
1217 }
1218
1219 /**
1220 * sdw_cdns_init() - Cadence initialization
1221 * @cdns: Cadence instance
1222 */
sdw_cdns_init(struct sdw_cdns *cdns)1223 int sdw_cdns_init(struct sdw_cdns *cdns)
1224 {
1225 u32 val;
1226
1227 cdns_init_clock_ctrl(cdns);
1228
1229 /* reset msg_count to default value of FIFOLEVEL */
1230 cdns->msg_count = cdns_readl(cdns, CDNS_MCP_FIFOLEVEL);
1231
1232 /* flush command FIFOs */
1233 cdns_updatel(cdns, CDNS_MCP_CONTROL, CDNS_MCP_CONTROL_CMD_RST,
1234 CDNS_MCP_CONTROL_CMD_RST);
1235
1236 /* Set cmd accept mode */
1237 cdns_updatel(cdns, CDNS_MCP_CONTROL, CDNS_MCP_CONTROL_CMD_ACCEPT,
1238 CDNS_MCP_CONTROL_CMD_ACCEPT);
1239
1240 /* Configure mcp config */
1241 val = cdns_readl(cdns, CDNS_MCP_CONFIG);
1242
1243 /* enable bus operations with clock and data */
1244 val &= ~CDNS_MCP_CONFIG_OP;
1245 val |= CDNS_MCP_CONFIG_OP_NORMAL;
1246
1247 /* Set cmd mode for Tx and Rx cmds */
1248 val &= ~CDNS_MCP_CONFIG_CMD;
1249
1250 /* Disable sniffer mode */
1251 val &= ~CDNS_MCP_CONFIG_SNIFFER;
1252
1253 /* Disable auto bus release */
1254 val &= ~CDNS_MCP_CONFIG_BUS_REL;
1255
1256 if (cdns->bus.multi_link)
1257 /* Set Multi-master mode to take gsync into account */
1258 val |= CDNS_MCP_CONFIG_MMASTER;
1259
1260 /* leave frame delay to hardware default of 0x1F */
1261
1262 /* leave command retry to hardware default of 0 */
1263
1264 cdns_writel(cdns, CDNS_MCP_CONFIG, val);
1265
1266 /* changes will be committed later */
1267 return 0;
1268 }
1269 EXPORT_SYMBOL(sdw_cdns_init);
1270
cdns_bus_conf(struct sdw_bus *bus, struct sdw_bus_params *params)1271 int cdns_bus_conf(struct sdw_bus *bus, struct sdw_bus_params *params)
1272 {
1273 struct sdw_master_prop *prop = &bus->prop;
1274 struct sdw_cdns *cdns = bus_to_cdns(bus);
1275 int mcp_clkctrl_off;
1276 int divider;
1277
1278 if (!params->curr_dr_freq) {
1279 dev_err(cdns->dev, "NULL curr_dr_freq\n");
1280 return -EINVAL;
1281 }
1282
1283 divider = prop->mclk_freq * SDW_DOUBLE_RATE_FACTOR /
1284 params->curr_dr_freq;
1285 divider--; /* divider is 1/(N+1) */
1286
1287 if (params->next_bank)
1288 mcp_clkctrl_off = CDNS_MCP_CLK_CTRL1;
1289 else
1290 mcp_clkctrl_off = CDNS_MCP_CLK_CTRL0;
1291
1292 cdns_updatel(cdns, mcp_clkctrl_off, CDNS_MCP_CLK_MCLKD_MASK, divider);
1293
1294 return 0;
1295 }
1296 EXPORT_SYMBOL(cdns_bus_conf);
1297
cdns_port_params(struct sdw_bus *bus, struct sdw_port_params *p_params, unsigned int bank)1298 static int cdns_port_params(struct sdw_bus *bus,
1299 struct sdw_port_params *p_params, unsigned int bank)
1300 {
1301 struct sdw_cdns *cdns = bus_to_cdns(bus);
1302 int dpn_config = 0, dpn_config_off;
1303
1304 if (bank)
1305 dpn_config_off = CDNS_DPN_B1_CONFIG(p_params->num);
1306 else
1307 dpn_config_off = CDNS_DPN_B0_CONFIG(p_params->num);
1308
1309 dpn_config = cdns_readl(cdns, dpn_config_off);
1310
1311 u32p_replace_bits(&dpn_config, (p_params->bps - 1), CDNS_DPN_CONFIG_WL);
1312 u32p_replace_bits(&dpn_config, p_params->flow_mode, CDNS_DPN_CONFIG_PORT_FLOW);
1313 u32p_replace_bits(&dpn_config, p_params->data_mode, CDNS_DPN_CONFIG_PORT_DAT);
1314
1315 cdns_writel(cdns, dpn_config_off, dpn_config);
1316
1317 return 0;
1318 }
1319
cdns_transport_params(struct sdw_bus *bus, struct sdw_transport_params *t_params, enum sdw_reg_bank bank)1320 static int cdns_transport_params(struct sdw_bus *bus,
1321 struct sdw_transport_params *t_params,
1322 enum sdw_reg_bank bank)
1323 {
1324 struct sdw_cdns *cdns = bus_to_cdns(bus);
1325 int dpn_offsetctrl = 0, dpn_offsetctrl_off;
1326 int dpn_config = 0, dpn_config_off;
1327 int dpn_hctrl = 0, dpn_hctrl_off;
1328 int num = t_params->port_num;
1329 int dpn_samplectrl_off;
1330
1331 /*
1332 * Note: Only full data port is supported on the Master side for
1333 * both PCM and PDM ports.
1334 */
1335
1336 if (bank) {
1337 dpn_config_off = CDNS_DPN_B1_CONFIG(num);
1338 dpn_samplectrl_off = CDNS_DPN_B1_SAMPLE_CTRL(num);
1339 dpn_hctrl_off = CDNS_DPN_B1_HCTRL(num);
1340 dpn_offsetctrl_off = CDNS_DPN_B1_OFFSET_CTRL(num);
1341 } else {
1342 dpn_config_off = CDNS_DPN_B0_CONFIG(num);
1343 dpn_samplectrl_off = CDNS_DPN_B0_SAMPLE_CTRL(num);
1344 dpn_hctrl_off = CDNS_DPN_B0_HCTRL(num);
1345 dpn_offsetctrl_off = CDNS_DPN_B0_OFFSET_CTRL(num);
1346 }
1347
1348 dpn_config = cdns_readl(cdns, dpn_config_off);
1349 u32p_replace_bits(&dpn_config, t_params->blk_grp_ctrl, CDNS_DPN_CONFIG_BGC);
1350 u32p_replace_bits(&dpn_config, t_params->blk_pkg_mode, CDNS_DPN_CONFIG_BPM);
1351 cdns_writel(cdns, dpn_config_off, dpn_config);
1352
1353 u32p_replace_bits(&dpn_offsetctrl, t_params->offset1, CDNS_DPN_OFFSET_CTRL_1);
1354 u32p_replace_bits(&dpn_offsetctrl, t_params->offset2, CDNS_DPN_OFFSET_CTRL_2);
1355 cdns_writel(cdns, dpn_offsetctrl_off, dpn_offsetctrl);
1356
1357 u32p_replace_bits(&dpn_hctrl, t_params->hstart, CDNS_DPN_HCTRL_HSTART);
1358 u32p_replace_bits(&dpn_hctrl, t_params->hstop, CDNS_DPN_HCTRL_HSTOP);
1359 u32p_replace_bits(&dpn_hctrl, t_params->lane_ctrl, CDNS_DPN_HCTRL_LCTRL);
1360
1361 cdns_writel(cdns, dpn_hctrl_off, dpn_hctrl);
1362 cdns_writel(cdns, dpn_samplectrl_off, (t_params->sample_interval - 1));
1363
1364 return 0;
1365 }
1366
cdns_port_enable(struct sdw_bus *bus, struct sdw_enable_ch *enable_ch, unsigned int bank)1367 static int cdns_port_enable(struct sdw_bus *bus,
1368 struct sdw_enable_ch *enable_ch, unsigned int bank)
1369 {
1370 struct sdw_cdns *cdns = bus_to_cdns(bus);
1371 int dpn_chnen_off, ch_mask;
1372
1373 if (bank)
1374 dpn_chnen_off = CDNS_DPN_B1_CH_EN(enable_ch->port_num);
1375 else
1376 dpn_chnen_off = CDNS_DPN_B0_CH_EN(enable_ch->port_num);
1377
1378 ch_mask = enable_ch->ch_mask * enable_ch->enable;
1379 cdns_writel(cdns, dpn_chnen_off, ch_mask);
1380
1381 return 0;
1382 }
1383
1384 static const struct sdw_master_port_ops cdns_port_ops = {
1385 .dpn_set_port_params = cdns_port_params,
1386 .dpn_set_port_transport_params = cdns_transport_params,
1387 .dpn_port_enable_ch = cdns_port_enable,
1388 };
1389
1390 /**
1391 * sdw_cdns_is_clock_stop: Check clock status
1392 *
1393 * @cdns: Cadence instance
1394 */
sdw_cdns_is_clock_stop(struct sdw_cdns *cdns)1395 bool sdw_cdns_is_clock_stop(struct sdw_cdns *cdns)
1396 {
1397 return !!(cdns_readl(cdns, CDNS_MCP_STAT) & CDNS_MCP_STAT_CLK_STOP);
1398 }
1399 EXPORT_SYMBOL(sdw_cdns_is_clock_stop);
1400
1401 /**
1402 * sdw_cdns_clock_stop: Cadence clock stop configuration routine
1403 *
1404 * @cdns: Cadence instance
1405 * @block_wake: prevent wakes if required by the platform
1406 */
sdw_cdns_clock_stop(struct sdw_cdns *cdns, bool block_wake)1407 int sdw_cdns_clock_stop(struct sdw_cdns *cdns, bool block_wake)
1408 {
1409 bool slave_present = false;
1410 struct sdw_slave *slave;
1411 int ret;
1412
1413 /* Check suspend status */
1414 if (sdw_cdns_is_clock_stop(cdns)) {
1415 dev_dbg(cdns->dev, "Clock is already stopped\n");
1416 return 0;
1417 }
1418
1419 /*
1420 * Before entering clock stop we mask the Slave
1421 * interrupts. This helps avoid having to deal with e.g. a
1422 * Slave becoming UNATTACHED while the clock is being stopped
1423 */
1424 cdns_enable_slave_interrupts(cdns, false);
1425
1426 /*
1427 * For specific platforms, it is required to be able to put
1428 * master into a state in which it ignores wake-up trials
1429 * in clock stop state
1430 */
1431 if (block_wake)
1432 cdns_updatel(cdns, CDNS_MCP_CONTROL,
1433 CDNS_MCP_CONTROL_BLOCK_WAKEUP,
1434 CDNS_MCP_CONTROL_BLOCK_WAKEUP);
1435
1436 list_for_each_entry(slave, &cdns->bus.slaves, node) {
1437 if (slave->status == SDW_SLAVE_ATTACHED ||
1438 slave->status == SDW_SLAVE_ALERT) {
1439 slave_present = true;
1440 break;
1441 }
1442 }
1443
1444 /*
1445 * This CMD_ACCEPT should be used when there are no devices
1446 * attached on the link when entering clock stop mode. If this is
1447 * not set and there is a broadcast write then the command ignored
1448 * will be treated as a failure
1449 */
1450 if (!slave_present)
1451 cdns_updatel(cdns, CDNS_MCP_CONTROL,
1452 CDNS_MCP_CONTROL_CMD_ACCEPT,
1453 CDNS_MCP_CONTROL_CMD_ACCEPT);
1454 else
1455 cdns_updatel(cdns, CDNS_MCP_CONTROL,
1456 CDNS_MCP_CONTROL_CMD_ACCEPT, 0);
1457
1458 /* commit changes */
1459 ret = cdns_config_update(cdns);
1460 if (ret < 0) {
1461 dev_err(cdns->dev, "%s: config_update failed\n", __func__);
1462 return ret;
1463 }
1464
1465 /* Prepare slaves for clock stop */
1466 if (slave_present) {
1467 ret = sdw_bus_prep_clk_stop(&cdns->bus);
1468 if (ret < 0 && ret != -ENODATA) {
1469 dev_err(cdns->dev, "prepare clock stop failed %d\n", ret);
1470 return ret;
1471 }
1472 }
1473
1474 /*
1475 * Enter clock stop mode and only report errors if there are
1476 * Slave devices present (ALERT or ATTACHED)
1477 */
1478 ret = sdw_bus_clk_stop(&cdns->bus);
1479 if (ret < 0 && slave_present && ret != -ENODATA) {
1480 dev_err(cdns->dev, "bus clock stop failed %d", ret);
1481 return ret;
1482 }
1483
1484 ret = cdns_set_wait(cdns, CDNS_MCP_STAT,
1485 CDNS_MCP_STAT_CLK_STOP,
1486 CDNS_MCP_STAT_CLK_STOP);
1487 if (ret < 0)
1488 dev_err(cdns->dev, "Clock stop failed %d\n", ret);
1489
1490 return ret;
1491 }
1492 EXPORT_SYMBOL(sdw_cdns_clock_stop);
1493
1494 /**
1495 * sdw_cdns_clock_restart: Cadence PM clock restart configuration routine
1496 *
1497 * @cdns: Cadence instance
1498 * @bus_reset: context may be lost while in low power modes and the bus
1499 * may require a Severe Reset and re-enumeration after a wake.
1500 */
sdw_cdns_clock_restart(struct sdw_cdns *cdns, bool bus_reset)1501 int sdw_cdns_clock_restart(struct sdw_cdns *cdns, bool bus_reset)
1502 {
1503 int ret;
1504
1505 /* unmask Slave interrupts that were masked when stopping the clock */
1506 cdns_enable_slave_interrupts(cdns, true);
1507
1508 ret = cdns_clear_bit(cdns, CDNS_MCP_CONTROL,
1509 CDNS_MCP_CONTROL_CLK_STOP_CLR);
1510 if (ret < 0) {
1511 dev_err(cdns->dev, "Couldn't exit from clock stop\n");
1512 return ret;
1513 }
1514
1515 ret = cdns_set_wait(cdns, CDNS_MCP_STAT, CDNS_MCP_STAT_CLK_STOP, 0);
1516 if (ret < 0) {
1517 dev_err(cdns->dev, "clock stop exit failed %d\n", ret);
1518 return ret;
1519 }
1520
1521 cdns_updatel(cdns, CDNS_MCP_CONTROL,
1522 CDNS_MCP_CONTROL_BLOCK_WAKEUP, 0);
1523
1524 /*
1525 * clear CMD_ACCEPT so that the command ignored
1526 * will be treated as a failure during a broadcast write
1527 */
1528 cdns_updatel(cdns, CDNS_MCP_CONTROL, CDNS_MCP_CONTROL_CMD_ACCEPT, 0);
1529
1530 if (!bus_reset) {
1531
1532 /* enable bus operations with clock and data */
1533 cdns_updatel(cdns, CDNS_MCP_CONFIG,
1534 CDNS_MCP_CONFIG_OP,
1535 CDNS_MCP_CONFIG_OP_NORMAL);
1536
1537 ret = cdns_config_update(cdns);
1538 if (ret < 0) {
1539 dev_err(cdns->dev, "%s: config_update failed\n", __func__);
1540 return ret;
1541 }
1542
1543 ret = sdw_bus_exit_clk_stop(&cdns->bus);
1544 if (ret < 0)
1545 dev_err(cdns->dev, "bus failed to exit clock stop %d\n", ret);
1546 }
1547
1548 return ret;
1549 }
1550 EXPORT_SYMBOL(sdw_cdns_clock_restart);
1551
1552 /**
1553 * sdw_cdns_probe() - Cadence probe routine
1554 * @cdns: Cadence instance
1555 */
sdw_cdns_probe(struct sdw_cdns *cdns)1556 int sdw_cdns_probe(struct sdw_cdns *cdns)
1557 {
1558 init_completion(&cdns->tx_complete);
1559 cdns->bus.port_ops = &cdns_port_ops;
1560
1561 INIT_WORK(&cdns->work, cdns_update_slave_status_work);
1562 return 0;
1563 }
1564 EXPORT_SYMBOL(sdw_cdns_probe);
1565
cdns_set_sdw_stream(struct snd_soc_dai *dai, void *stream, bool pcm, int direction)1566 int cdns_set_sdw_stream(struct snd_soc_dai *dai,
1567 void *stream, bool pcm, int direction)
1568 {
1569 struct sdw_cdns *cdns = snd_soc_dai_get_drvdata(dai);
1570 struct sdw_cdns_dma_data *dma;
1571
1572 if (stream) {
1573 /* first paranoia check */
1574 if (direction == SNDRV_PCM_STREAM_PLAYBACK)
1575 dma = dai->playback_dma_data;
1576 else
1577 dma = dai->capture_dma_data;
1578
1579 if (dma) {
1580 dev_err(dai->dev,
1581 "dma_data already allocated for dai %s\n",
1582 dai->name);
1583 return -EINVAL;
1584 }
1585
1586 /* allocate and set dma info */
1587 dma = kzalloc(sizeof(*dma), GFP_KERNEL);
1588 if (!dma)
1589 return -ENOMEM;
1590
1591 if (pcm)
1592 dma->stream_type = SDW_STREAM_PCM;
1593 else
1594 dma->stream_type = SDW_STREAM_PDM;
1595
1596 dma->bus = &cdns->bus;
1597 dma->link_id = cdns->instance;
1598
1599 dma->stream = stream;
1600
1601 if (direction == SNDRV_PCM_STREAM_PLAYBACK)
1602 dai->playback_dma_data = dma;
1603 else
1604 dai->capture_dma_data = dma;
1605 } else {
1606 /* for NULL stream we release allocated dma_data */
1607 if (direction == SNDRV_PCM_STREAM_PLAYBACK) {
1608 kfree(dai->playback_dma_data);
1609 dai->playback_dma_data = NULL;
1610 } else {
1611 kfree(dai->capture_dma_data);
1612 dai->capture_dma_data = NULL;
1613 }
1614 }
1615 return 0;
1616 }
1617 EXPORT_SYMBOL(cdns_set_sdw_stream);
1618
1619 /**
1620 * cdns_find_pdi() - Find a free PDI
1621 *
1622 * @cdns: Cadence instance
1623 * @offset: Starting offset
1624 * @num: Number of PDIs
1625 * @pdi: PDI instances
1626 * @dai_id: DAI id
1627 *
1628 * Find a PDI for a given PDI array. The PDI num and dai_id are
1629 * expected to match, return NULL otherwise.
1630 */
cdns_find_pdi(struct sdw_cdns *cdns, unsigned int offset, unsigned int num, struct sdw_cdns_pdi *pdi, int dai_id)1631 static struct sdw_cdns_pdi *cdns_find_pdi(struct sdw_cdns *cdns,
1632 unsigned int offset,
1633 unsigned int num,
1634 struct sdw_cdns_pdi *pdi,
1635 int dai_id)
1636 {
1637 int i;
1638
1639 for (i = offset; i < offset + num; i++)
1640 if (pdi[i].num == dai_id)
1641 return &pdi[i];
1642
1643 return NULL;
1644 }
1645
1646 /**
1647 * sdw_cdns_config_stream: Configure a stream
1648 *
1649 * @cdns: Cadence instance
1650 * @ch: Channel count
1651 * @dir: Data direction
1652 * @pdi: PDI to be used
1653 */
sdw_cdns_config_stream(struct sdw_cdns *cdns, u32 ch, u32 dir, struct sdw_cdns_pdi *pdi)1654 void sdw_cdns_config_stream(struct sdw_cdns *cdns,
1655 u32 ch, u32 dir, struct sdw_cdns_pdi *pdi)
1656 {
1657 u32 offset, val = 0;
1658
1659 if (dir == SDW_DATA_DIR_RX) {
1660 val = CDNS_PORTCTRL_DIRN;
1661
1662 if (cdns->bus.params.m_data_mode != SDW_PORT_DATA_MODE_NORMAL)
1663 val |= CDNS_PORTCTRL_TEST_FAILED;
1664 }
1665 offset = CDNS_PORTCTRL + pdi->num * CDNS_PORT_OFFSET;
1666 cdns_updatel(cdns, offset,
1667 CDNS_PORTCTRL_DIRN | CDNS_PORTCTRL_TEST_FAILED,
1668 val);
1669
1670 val = pdi->num;
1671 val |= CDNS_PDI_CONFIG_SOFT_RESET;
1672 val |= FIELD_PREP(CDNS_PDI_CONFIG_CHANNEL, (1 << ch) - 1);
1673 cdns_writel(cdns, CDNS_PDI_CONFIG(pdi->num), val);
1674 }
1675 EXPORT_SYMBOL(sdw_cdns_config_stream);
1676
1677 /**
1678 * sdw_cdns_alloc_pdi() - Allocate a PDI
1679 *
1680 * @cdns: Cadence instance
1681 * @stream: Stream to be allocated
1682 * @ch: Channel count
1683 * @dir: Data direction
1684 * @dai_id: DAI id
1685 */
sdw_cdns_alloc_pdi(struct sdw_cdns *cdns, struct sdw_cdns_streams *stream, u32 ch, u32 dir, int dai_id)1686 struct sdw_cdns_pdi *sdw_cdns_alloc_pdi(struct sdw_cdns *cdns,
1687 struct sdw_cdns_streams *stream,
1688 u32 ch, u32 dir, int dai_id)
1689 {
1690 struct sdw_cdns_pdi *pdi = NULL;
1691
1692 if (dir == SDW_DATA_DIR_RX)
1693 pdi = cdns_find_pdi(cdns, 0, stream->num_in, stream->in,
1694 dai_id);
1695 else
1696 pdi = cdns_find_pdi(cdns, 0, stream->num_out, stream->out,
1697 dai_id);
1698
1699 /* check if we found a PDI, else find in bi-directional */
1700 if (!pdi)
1701 pdi = cdns_find_pdi(cdns, 2, stream->num_bd, stream->bd,
1702 dai_id);
1703
1704 if (pdi) {
1705 pdi->l_ch_num = 0;
1706 pdi->h_ch_num = ch - 1;
1707 pdi->dir = dir;
1708 pdi->ch_count = ch;
1709 }
1710
1711 return pdi;
1712 }
1713 EXPORT_SYMBOL(sdw_cdns_alloc_pdi);
1714
1715 MODULE_LICENSE("Dual BSD/GPL");
1716 MODULE_DESCRIPTION("Cadence Soundwire Library");
1717