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
514 static enum sdw_command_response
_cdns_xfer_msg(struct sdw_cdns * cdns,struct sdw_msg * msg,int cmd,int offset,int count,bool defer)515 _cdns_xfer_msg(struct sdw_cdns *cdns, struct sdw_msg *msg, int cmd,
516 int offset, int count, bool defer)
517 {
518 unsigned long time;
519 u32 base, i, data;
520 u16 addr;
521
522 /* Program the watermark level for RX FIFO */
523 if (cdns->msg_count != count) {
524 cdns_writel(cdns, CDNS_MCP_FIFOLEVEL, count);
525 cdns->msg_count = count;
526 }
527
528 base = CDNS_MCP_CMD_BASE;
529 addr = msg->addr;
530
531 for (i = 0; i < count; i++) {
532 data = FIELD_PREP(CDNS_MCP_CMD_DEV_ADDR, msg->dev_num);
533 data |= FIELD_PREP(CDNS_MCP_CMD_COMMAND, cmd);
534 data |= FIELD_PREP(CDNS_MCP_CMD_REG_ADDR, addr);
535 addr++;
536
537 if (msg->flags == SDW_MSG_FLAG_WRITE)
538 data |= msg->buf[i + offset];
539
540 data |= FIELD_PREP(CDNS_MCP_CMD_SSP_TAG, msg->ssp_sync);
541 cdns_writel(cdns, base, data);
542 base += CDNS_MCP_CMD_WORD_LEN;
543 }
544
545 if (defer)
546 return SDW_CMD_OK;
547
548 /* wait for timeout or response */
549 time = wait_for_completion_timeout(&cdns->tx_complete,
550 msecs_to_jiffies(CDNS_TX_TIMEOUT));
551 if (!time) {
552 dev_err(cdns->dev, "IO transfer timed out, cmd %d device %d addr %x len %d\n",
553 cmd, msg->dev_num, msg->addr, msg->len);
554 msg->len = 0;
555 return SDW_CMD_TIMEOUT;
556 }
557
558 return cdns_fill_msg_resp(cdns, msg, count, offset);
559 }
560
561 static enum sdw_command_response
cdns_program_scp_addr(struct sdw_cdns * cdns,struct sdw_msg * msg)562 cdns_program_scp_addr(struct sdw_cdns *cdns, struct sdw_msg *msg)
563 {
564 int nack = 0, no_ack = 0;
565 unsigned long time;
566 u32 data[2], base;
567 int i;
568
569 /* Program the watermark level for RX FIFO */
570 if (cdns->msg_count != CDNS_SCP_RX_FIFOLEVEL) {
571 cdns_writel(cdns, CDNS_MCP_FIFOLEVEL, CDNS_SCP_RX_FIFOLEVEL);
572 cdns->msg_count = CDNS_SCP_RX_FIFOLEVEL;
573 }
574
575 data[0] = FIELD_PREP(CDNS_MCP_CMD_DEV_ADDR, msg->dev_num);
576 data[0] |= FIELD_PREP(CDNS_MCP_CMD_COMMAND, 0x3);
577 data[1] = data[0];
578
579 data[0] |= FIELD_PREP(CDNS_MCP_CMD_REG_ADDR, SDW_SCP_ADDRPAGE1);
580 data[1] |= FIELD_PREP(CDNS_MCP_CMD_REG_ADDR, SDW_SCP_ADDRPAGE2);
581
582 data[0] |= msg->addr_page1;
583 data[1] |= msg->addr_page2;
584
585 base = CDNS_MCP_CMD_BASE;
586 cdns_writel(cdns, base, data[0]);
587 base += CDNS_MCP_CMD_WORD_LEN;
588 cdns_writel(cdns, base, data[1]);
589
590 time = wait_for_completion_timeout(&cdns->tx_complete,
591 msecs_to_jiffies(CDNS_TX_TIMEOUT));
592 if (!time) {
593 dev_err(cdns->dev, "SCP Msg trf timed out\n");
594 msg->len = 0;
595 return SDW_CMD_TIMEOUT;
596 }
597
598 /* check response the writes */
599 for (i = 0; i < 2; i++) {
600 if (!(cdns->response_buf[i] & CDNS_MCP_RESP_ACK)) {
601 no_ack = 1;
602 dev_err(cdns->dev, "Program SCP Ack not received\n");
603 if (cdns->response_buf[i] & CDNS_MCP_RESP_NACK) {
604 nack = 1;
605 dev_err(cdns->dev, "Program SCP NACK received\n");
606 }
607 }
608 }
609
610 /* For NACK, NO ack, don't return err if we are in Broadcast mode */
611 if (nack) {
612 dev_err_ratelimited(cdns->dev,
613 "SCP_addrpage NACKed for Slave %d\n", msg->dev_num);
614 return SDW_CMD_FAIL;
615 }
616
617 if (no_ack) {
618 dev_dbg_ratelimited(cdns->dev,
619 "SCP_addrpage ignored for Slave %d\n", msg->dev_num);
620 return SDW_CMD_IGNORED;
621 }
622
623 return SDW_CMD_OK;
624 }
625
cdns_prep_msg(struct sdw_cdns * cdns,struct sdw_msg * msg,int * cmd)626 static int cdns_prep_msg(struct sdw_cdns *cdns, struct sdw_msg *msg, int *cmd)
627 {
628 int ret;
629
630 if (msg->page) {
631 ret = cdns_program_scp_addr(cdns, msg);
632 if (ret) {
633 msg->len = 0;
634 return ret;
635 }
636 }
637
638 switch (msg->flags) {
639 case SDW_MSG_FLAG_READ:
640 *cmd = CDNS_MCP_CMD_READ;
641 break;
642
643 case SDW_MSG_FLAG_WRITE:
644 *cmd = CDNS_MCP_CMD_WRITE;
645 break;
646
647 default:
648 dev_err(cdns->dev, "Invalid msg cmd: %d\n", msg->flags);
649 return -EINVAL;
650 }
651
652 return 0;
653 }
654
655 enum sdw_command_response
cdns_xfer_msg(struct sdw_bus * bus,struct sdw_msg * msg)656 cdns_xfer_msg(struct sdw_bus *bus, struct sdw_msg *msg)
657 {
658 struct sdw_cdns *cdns = bus_to_cdns(bus);
659 int cmd = 0, ret, i;
660
661 ret = cdns_prep_msg(cdns, msg, &cmd);
662 if (ret)
663 return SDW_CMD_FAIL_OTHER;
664
665 for (i = 0; i < msg->len / CDNS_MCP_CMD_LEN; i++) {
666 ret = _cdns_xfer_msg(cdns, msg, cmd, i * CDNS_MCP_CMD_LEN,
667 CDNS_MCP_CMD_LEN, false);
668 if (ret < 0)
669 goto exit;
670 }
671
672 if (!(msg->len % CDNS_MCP_CMD_LEN))
673 goto exit;
674
675 ret = _cdns_xfer_msg(cdns, msg, cmd, i * CDNS_MCP_CMD_LEN,
676 msg->len % CDNS_MCP_CMD_LEN, false);
677
678 exit:
679 return ret;
680 }
681 EXPORT_SYMBOL(cdns_xfer_msg);
682
683 enum sdw_command_response
cdns_xfer_msg_defer(struct sdw_bus * bus,struct sdw_msg * msg,struct sdw_defer * defer)684 cdns_xfer_msg_defer(struct sdw_bus *bus,
685 struct sdw_msg *msg, struct sdw_defer *defer)
686 {
687 struct sdw_cdns *cdns = bus_to_cdns(bus);
688 int cmd = 0, ret;
689
690 /* for defer only 1 message is supported */
691 if (msg->len > 1)
692 return -ENOTSUPP;
693
694 ret = cdns_prep_msg(cdns, msg, &cmd);
695 if (ret)
696 return SDW_CMD_FAIL_OTHER;
697
698 cdns->defer = defer;
699 cdns->defer->length = msg->len;
700
701 return _cdns_xfer_msg(cdns, msg, cmd, 0, msg->len, true);
702 }
703 EXPORT_SYMBOL(cdns_xfer_msg_defer);
704
705 enum sdw_command_response
cdns_reset_page_addr(struct sdw_bus * bus,unsigned int dev_num)706 cdns_reset_page_addr(struct sdw_bus *bus, unsigned int dev_num)
707 {
708 struct sdw_cdns *cdns = bus_to_cdns(bus);
709 struct sdw_msg msg;
710
711 /* Create dummy message with valid device number */
712 memset(&msg, 0, sizeof(msg));
713 msg.dev_num = dev_num;
714
715 return cdns_program_scp_addr(cdns, &msg);
716 }
717 EXPORT_SYMBOL(cdns_reset_page_addr);
718
719 /*
720 * IRQ handling
721 */
722
cdns_read_response(struct sdw_cdns * cdns)723 static void cdns_read_response(struct sdw_cdns *cdns)
724 {
725 u32 num_resp, cmd_base;
726 int i;
727
728 num_resp = cdns_readl(cdns, CDNS_MCP_FIFOSTAT);
729 num_resp &= CDNS_MCP_RX_FIFO_AVAIL;
730
731 cmd_base = CDNS_MCP_CMD_BASE;
732
733 for (i = 0; i < num_resp; i++) {
734 cdns->response_buf[i] = cdns_readl(cdns, cmd_base);
735 cmd_base += CDNS_MCP_CMD_WORD_LEN;
736 }
737 }
738
cdns_update_slave_status(struct sdw_cdns * cdns,u32 slave0,u32 slave1)739 static int cdns_update_slave_status(struct sdw_cdns *cdns,
740 u32 slave0, u32 slave1)
741 {
742 enum sdw_slave_status status[SDW_MAX_DEVICES + 1];
743 bool is_slave = false;
744 u64 slave;
745 u32 mask;
746 int i, set_status;
747
748 /* combine the two status */
749 slave = ((u64)slave1 << 32) | slave0;
750 memset(status, 0, sizeof(status));
751
752 for (i = 0; i <= SDW_MAX_DEVICES; i++) {
753 mask = (slave >> (i * CDNS_MCP_SLAVE_STATUS_NUM)) &
754 CDNS_MCP_SLAVE_STATUS_BITS;
755 if (!mask)
756 continue;
757
758 is_slave = true;
759 set_status = 0;
760
761 if (mask & CDNS_MCP_SLAVE_INTSTAT_RESERVED) {
762 status[i] = SDW_SLAVE_RESERVED;
763 set_status++;
764 }
765
766 if (mask & CDNS_MCP_SLAVE_INTSTAT_ATTACHED) {
767 status[i] = SDW_SLAVE_ATTACHED;
768 set_status++;
769 }
770
771 if (mask & CDNS_MCP_SLAVE_INTSTAT_ALERT) {
772 status[i] = SDW_SLAVE_ALERT;
773 set_status++;
774 }
775
776 if (mask & CDNS_MCP_SLAVE_INTSTAT_NPRESENT) {
777 status[i] = SDW_SLAVE_UNATTACHED;
778 set_status++;
779 }
780
781 /* first check if Slave reported multiple status */
782 if (set_status > 1) {
783 u32 val;
784
785 dev_warn_ratelimited(cdns->dev,
786 "Slave %d reported multiple Status: %d\n",
787 i, mask);
788
789 /* check latest status extracted from PING commands */
790 val = cdns_readl(cdns, CDNS_MCP_SLAVE_STAT);
791 val >>= (i * 2);
792
793 switch (val & 0x3) {
794 case 0:
795 status[i] = SDW_SLAVE_UNATTACHED;
796 break;
797 case 1:
798 status[i] = SDW_SLAVE_ATTACHED;
799 break;
800 case 2:
801 status[i] = SDW_SLAVE_ALERT;
802 break;
803 case 3:
804 default:
805 status[i] = SDW_SLAVE_RESERVED;
806 break;
807 }
808
809 dev_warn_ratelimited(cdns->dev,
810 "Slave %d status updated to %d\n",
811 i, status[i]);
812
813 }
814 }
815
816 if (is_slave)
817 return sdw_handle_slave_status(&cdns->bus, status);
818
819 return 0;
820 }
821
822 /**
823 * sdw_cdns_irq() - Cadence interrupt handler
824 * @irq: irq number
825 * @dev_id: irq context
826 */
sdw_cdns_irq(int irq,void * dev_id)827 irqreturn_t sdw_cdns_irq(int irq, void *dev_id)
828 {
829 struct sdw_cdns *cdns = dev_id;
830 u32 int_status;
831 int ret = IRQ_HANDLED;
832
833 /* Check if the link is up */
834 if (!cdns->link_up)
835 return IRQ_NONE;
836
837 int_status = cdns_readl(cdns, CDNS_MCP_INTSTAT);
838
839 /* check for reserved values read as zero */
840 if (int_status & CDNS_MCP_INT_RESERVED)
841 return IRQ_NONE;
842
843 if (!(int_status & CDNS_MCP_INT_IRQ))
844 return IRQ_NONE;
845
846 if (int_status & CDNS_MCP_INT_RX_WL) {
847 cdns_read_response(cdns);
848
849 if (cdns->defer) {
850 cdns_fill_msg_resp(cdns, cdns->defer->msg,
851 cdns->defer->length, 0);
852 complete(&cdns->defer->complete);
853 cdns->defer = NULL;
854 } else {
855 complete(&cdns->tx_complete);
856 }
857 }
858
859 if (int_status & CDNS_MCP_INT_PARITY) {
860 /* Parity error detected by Master */
861 dev_err_ratelimited(cdns->dev, "Parity error\n");
862 }
863
864 if (int_status & CDNS_MCP_INT_CTRL_CLASH) {
865 /* Slave is driving bit slot during control word */
866 dev_err_ratelimited(cdns->dev, "Bus clash for control word\n");
867 }
868
869 if (int_status & CDNS_MCP_INT_DATA_CLASH) {
870 /*
871 * Multiple slaves trying to drive bit slot, or issue with
872 * ownership of data bits or Slave gone bonkers
873 */
874 dev_err_ratelimited(cdns->dev, "Bus clash for data word\n");
875 }
876
877 if (cdns->bus.params.m_data_mode != SDW_PORT_DATA_MODE_NORMAL &&
878 int_status & CDNS_MCP_INT_DPINT) {
879 u32 port_intstat;
880
881 /* just log which ports report an error */
882 port_intstat = cdns_readl(cdns, CDNS_MCP_PORT_INTSTAT);
883 dev_err_ratelimited(cdns->dev, "DP interrupt: PortIntStat %8x\n",
884 port_intstat);
885
886 /* clear status w/ write1 */
887 cdns_writel(cdns, CDNS_MCP_PORT_INTSTAT, port_intstat);
888 }
889
890 if (int_status & CDNS_MCP_INT_SLAVE_MASK) {
891 /* Mask the Slave interrupt and wake thread */
892 cdns_updatel(cdns, CDNS_MCP_INTMASK,
893 CDNS_MCP_INT_SLAVE_MASK, 0);
894
895 int_status &= ~CDNS_MCP_INT_SLAVE_MASK;
896
897 /*
898 * Deal with possible race condition between interrupt
899 * handling and disabling interrupts on suspend.
900 *
901 * If the master is in the process of disabling
902 * interrupts, don't schedule a workqueue
903 */
904 if (cdns->interrupt_enabled)
905 schedule_work(&cdns->work);
906 }
907
908 cdns_writel(cdns, CDNS_MCP_INTSTAT, int_status);
909 return ret;
910 }
911 EXPORT_SYMBOL(sdw_cdns_irq);
912
913 /**
914 * To update slave status in a work since we will need to handle
915 * other interrupts eg. CDNS_MCP_INT_RX_WL during the update slave
916 * process.
917 * @work: cdns worker thread
918 */
cdns_update_slave_status_work(struct work_struct * work)919 static void cdns_update_slave_status_work(struct work_struct *work)
920 {
921 struct sdw_cdns *cdns =
922 container_of(work, struct sdw_cdns, work);
923 u32 slave0, slave1;
924
925 dev_dbg_ratelimited(cdns->dev, "Slave status change\n");
926
927 slave0 = cdns_readl(cdns, CDNS_MCP_SLAVE_INTSTAT0);
928 slave1 = cdns_readl(cdns, CDNS_MCP_SLAVE_INTSTAT1);
929
930 cdns_update_slave_status(cdns, slave0, slave1);
931 cdns_writel(cdns, CDNS_MCP_SLAVE_INTSTAT0, slave0);
932 cdns_writel(cdns, CDNS_MCP_SLAVE_INTSTAT1, slave1);
933
934 /* clear and unmask Slave interrupt now */
935 cdns_writel(cdns, CDNS_MCP_INTSTAT, CDNS_MCP_INT_SLAVE_MASK);
936 cdns_updatel(cdns, CDNS_MCP_INTMASK,
937 CDNS_MCP_INT_SLAVE_MASK, CDNS_MCP_INT_SLAVE_MASK);
938
939 }
940
941 /*
942 * init routines
943 */
944
945 /**
946 * sdw_cdns_exit_reset() - Program reset parameters and start bus operations
947 * @cdns: Cadence instance
948 */
sdw_cdns_exit_reset(struct sdw_cdns * cdns)949 int sdw_cdns_exit_reset(struct sdw_cdns *cdns)
950 {
951 /* program maximum length reset to be safe */
952 cdns_updatel(cdns, CDNS_MCP_CONTROL,
953 CDNS_MCP_CONTROL_RST_DELAY,
954 CDNS_MCP_CONTROL_RST_DELAY);
955
956 /* use hardware generated reset */
957 cdns_updatel(cdns, CDNS_MCP_CONTROL,
958 CDNS_MCP_CONTROL_HW_RST,
959 CDNS_MCP_CONTROL_HW_RST);
960
961 /* commit changes */
962 cdns_updatel(cdns, CDNS_MCP_CONFIG_UPDATE,
963 CDNS_MCP_CONFIG_UPDATE_BIT,
964 CDNS_MCP_CONFIG_UPDATE_BIT);
965
966 /* don't wait here */
967 return 0;
968
969 }
970 EXPORT_SYMBOL(sdw_cdns_exit_reset);
971
972 /**
973 * sdw_cdns_enable_slave_interrupt() - Enable SDW slave interrupts
974 * @cdns: Cadence instance
975 * @state: boolean for true/false
976 */
cdns_enable_slave_interrupts(struct sdw_cdns * cdns,bool state)977 static void cdns_enable_slave_interrupts(struct sdw_cdns *cdns, bool state)
978 {
979 u32 mask;
980
981 mask = cdns_readl(cdns, CDNS_MCP_INTMASK);
982 if (state)
983 mask |= CDNS_MCP_INT_SLAVE_MASK;
984 else
985 mask &= ~CDNS_MCP_INT_SLAVE_MASK;
986
987 cdns_writel(cdns, CDNS_MCP_INTMASK, mask);
988 }
989
990 /**
991 * sdw_cdns_enable_interrupt() - Enable SDW interrupts
992 * @cdns: Cadence instance
993 * @state: True if we are trying to enable interrupt.
994 */
sdw_cdns_enable_interrupt(struct sdw_cdns * cdns,bool state)995 int sdw_cdns_enable_interrupt(struct sdw_cdns *cdns, bool state)
996 {
997 u32 slave_intmask0 = 0;
998 u32 slave_intmask1 = 0;
999 u32 mask = 0;
1000
1001 if (!state)
1002 goto update_masks;
1003
1004 slave_intmask0 = CDNS_MCP_SLAVE_INTMASK0_MASK;
1005 slave_intmask1 = CDNS_MCP_SLAVE_INTMASK1_MASK;
1006
1007 /* enable detection of all slave state changes */
1008 mask = CDNS_MCP_INT_SLAVE_MASK;
1009
1010 /* enable detection of bus issues */
1011 mask |= CDNS_MCP_INT_CTRL_CLASH | CDNS_MCP_INT_DATA_CLASH |
1012 CDNS_MCP_INT_PARITY;
1013
1014 /* port interrupt limited to test modes for now */
1015 if (cdns->bus.params.m_data_mode != SDW_PORT_DATA_MODE_NORMAL)
1016 mask |= CDNS_MCP_INT_DPINT;
1017
1018 /* enable detection of RX fifo level */
1019 mask |= CDNS_MCP_INT_RX_WL;
1020
1021 /*
1022 * CDNS_MCP_INT_IRQ needs to be set otherwise all previous
1023 * settings are irrelevant
1024 */
1025 mask |= CDNS_MCP_INT_IRQ;
1026
1027 if (interrupt_mask) /* parameter override */
1028 mask = interrupt_mask;
1029
1030 update_masks:
1031 /* clear slave interrupt status before enabling interrupt */
1032 if (state) {
1033 u32 slave_state;
1034
1035 slave_state = cdns_readl(cdns, CDNS_MCP_SLAVE_INTSTAT0);
1036 cdns_writel(cdns, CDNS_MCP_SLAVE_INTSTAT0, slave_state);
1037 slave_state = cdns_readl(cdns, CDNS_MCP_SLAVE_INTSTAT1);
1038 cdns_writel(cdns, CDNS_MCP_SLAVE_INTSTAT1, slave_state);
1039 }
1040 cdns->interrupt_enabled = state;
1041
1042 /*
1043 * Complete any on-going status updates before updating masks,
1044 * and cancel queued status updates.
1045 *
1046 * There could be a race with a new interrupt thrown before
1047 * the 3 mask updates below are complete, so in the interrupt
1048 * we use the 'interrupt_enabled' status to prevent new work
1049 * from being queued.
1050 */
1051 if (!state)
1052 cancel_work_sync(&cdns->work);
1053
1054 cdns_writel(cdns, CDNS_MCP_SLAVE_INTMASK0, slave_intmask0);
1055 cdns_writel(cdns, CDNS_MCP_SLAVE_INTMASK1, slave_intmask1);
1056 cdns_writel(cdns, CDNS_MCP_INTMASK, mask);
1057
1058 return 0;
1059 }
1060 EXPORT_SYMBOL(sdw_cdns_enable_interrupt);
1061
cdns_allocate_pdi(struct sdw_cdns * cdns,struct sdw_cdns_pdi ** stream,u32 num,u32 pdi_offset)1062 static int cdns_allocate_pdi(struct sdw_cdns *cdns,
1063 struct sdw_cdns_pdi **stream,
1064 u32 num, u32 pdi_offset)
1065 {
1066 struct sdw_cdns_pdi *pdi;
1067 int i;
1068
1069 if (!num)
1070 return 0;
1071
1072 pdi = devm_kcalloc(cdns->dev, num, sizeof(*pdi), GFP_KERNEL);
1073 if (!pdi)
1074 return -ENOMEM;
1075
1076 for (i = 0; i < num; i++) {
1077 pdi[i].num = i + pdi_offset;
1078 }
1079
1080 *stream = pdi;
1081 return 0;
1082 }
1083
1084 /**
1085 * sdw_cdns_pdi_init() - PDI initialization routine
1086 *
1087 * @cdns: Cadence instance
1088 * @config: Stream configurations
1089 */
sdw_cdns_pdi_init(struct sdw_cdns * cdns,struct sdw_cdns_stream_config config)1090 int sdw_cdns_pdi_init(struct sdw_cdns *cdns,
1091 struct sdw_cdns_stream_config config)
1092 {
1093 struct sdw_cdns_streams *stream;
1094 int offset;
1095 int ret;
1096
1097 cdns->pcm.num_bd = config.pcm_bd;
1098 cdns->pcm.num_in = config.pcm_in;
1099 cdns->pcm.num_out = config.pcm_out;
1100 cdns->pdm.num_bd = config.pdm_bd;
1101 cdns->pdm.num_in = config.pdm_in;
1102 cdns->pdm.num_out = config.pdm_out;
1103
1104 /* Allocate PDIs for PCMs */
1105 stream = &cdns->pcm;
1106
1107 /* we allocate PDI0 and PDI1 which are used for Bulk */
1108 offset = 0;
1109
1110 ret = cdns_allocate_pdi(cdns, &stream->bd,
1111 stream->num_bd, offset);
1112 if (ret)
1113 return ret;
1114
1115 offset += stream->num_bd;
1116
1117 ret = cdns_allocate_pdi(cdns, &stream->in,
1118 stream->num_in, offset);
1119 if (ret)
1120 return ret;
1121
1122 offset += stream->num_in;
1123
1124 ret = cdns_allocate_pdi(cdns, &stream->out,
1125 stream->num_out, offset);
1126 if (ret)
1127 return ret;
1128
1129 /* Update total number of PCM PDIs */
1130 stream->num_pdi = stream->num_bd + stream->num_in + stream->num_out;
1131 cdns->num_ports = stream->num_pdi;
1132
1133 /* Allocate PDIs for PDMs */
1134 stream = &cdns->pdm;
1135 ret = cdns_allocate_pdi(cdns, &stream->bd,
1136 stream->num_bd, offset);
1137 if (ret)
1138 return ret;
1139
1140 offset += stream->num_bd;
1141
1142 ret = cdns_allocate_pdi(cdns, &stream->in,
1143 stream->num_in, offset);
1144 if (ret)
1145 return ret;
1146
1147 offset += stream->num_in;
1148
1149 ret = cdns_allocate_pdi(cdns, &stream->out,
1150 stream->num_out, offset);
1151
1152 if (ret)
1153 return ret;
1154
1155 /* Update total number of PDM PDIs */
1156 stream->num_pdi = stream->num_bd + stream->num_in + stream->num_out;
1157 cdns->num_ports += stream->num_pdi;
1158
1159 return 0;
1160 }
1161 EXPORT_SYMBOL(sdw_cdns_pdi_init);
1162
cdns_set_initial_frame_shape(int n_rows,int n_cols)1163 static u32 cdns_set_initial_frame_shape(int n_rows, int n_cols)
1164 {
1165 u32 val;
1166 int c;
1167 int r;
1168
1169 r = sdw_find_row_index(n_rows);
1170 c = sdw_find_col_index(n_cols);
1171
1172 val = FIELD_PREP(CDNS_MCP_FRAME_SHAPE_ROW_MASK, r);
1173 val |= FIELD_PREP(CDNS_MCP_FRAME_SHAPE_COL_MASK, c);
1174
1175 return val;
1176 }
1177
cdns_init_clock_ctrl(struct sdw_cdns * cdns)1178 static void cdns_init_clock_ctrl(struct sdw_cdns *cdns)
1179 {
1180 struct sdw_bus *bus = &cdns->bus;
1181 struct sdw_master_prop *prop = &bus->prop;
1182 u32 val;
1183 u32 ssp_interval;
1184 int divider;
1185
1186 /* Set clock divider */
1187 divider = (prop->mclk_freq / prop->max_clk_freq) - 1;
1188
1189 cdns_updatel(cdns, CDNS_MCP_CLK_CTRL0,
1190 CDNS_MCP_CLK_MCLKD_MASK, divider);
1191 cdns_updatel(cdns, CDNS_MCP_CLK_CTRL1,
1192 CDNS_MCP_CLK_MCLKD_MASK, divider);
1193
1194 /*
1195 * Frame shape changes after initialization have to be done
1196 * with the bank switch mechanism
1197 */
1198 val = cdns_set_initial_frame_shape(prop->default_row,
1199 prop->default_col);
1200 cdns_writel(cdns, CDNS_MCP_FRAME_SHAPE_INIT, val);
1201
1202 /* Set SSP interval to default value */
1203 ssp_interval = prop->default_frame_rate / SDW_CADENCE_GSYNC_HZ;
1204 cdns_writel(cdns, CDNS_MCP_SSP_CTRL0, ssp_interval);
1205 cdns_writel(cdns, CDNS_MCP_SSP_CTRL1, ssp_interval);
1206 }
1207
1208 /**
1209 * sdw_cdns_init() - Cadence initialization
1210 * @cdns: Cadence instance
1211 */
sdw_cdns_init(struct sdw_cdns * cdns)1212 int sdw_cdns_init(struct sdw_cdns *cdns)
1213 {
1214 u32 val;
1215
1216 cdns_init_clock_ctrl(cdns);
1217
1218 /* reset msg_count to default value of FIFOLEVEL */
1219 cdns->msg_count = cdns_readl(cdns, CDNS_MCP_FIFOLEVEL);
1220
1221 /* flush command FIFOs */
1222 cdns_updatel(cdns, CDNS_MCP_CONTROL, CDNS_MCP_CONTROL_CMD_RST,
1223 CDNS_MCP_CONTROL_CMD_RST);
1224
1225 /* Set cmd accept mode */
1226 cdns_updatel(cdns, CDNS_MCP_CONTROL, CDNS_MCP_CONTROL_CMD_ACCEPT,
1227 CDNS_MCP_CONTROL_CMD_ACCEPT);
1228
1229 /* Configure mcp config */
1230 val = cdns_readl(cdns, CDNS_MCP_CONFIG);
1231
1232 /* enable bus operations with clock and data */
1233 val &= ~CDNS_MCP_CONFIG_OP;
1234 val |= CDNS_MCP_CONFIG_OP_NORMAL;
1235
1236 /* Set cmd mode for Tx and Rx cmds */
1237 val &= ~CDNS_MCP_CONFIG_CMD;
1238
1239 /* Disable sniffer mode */
1240 val &= ~CDNS_MCP_CONFIG_SNIFFER;
1241
1242 /* Disable auto bus release */
1243 val &= ~CDNS_MCP_CONFIG_BUS_REL;
1244
1245 if (cdns->bus.multi_link)
1246 /* Set Multi-master mode to take gsync into account */
1247 val |= CDNS_MCP_CONFIG_MMASTER;
1248
1249 /* leave frame delay to hardware default of 0x1F */
1250
1251 /* leave command retry to hardware default of 0 */
1252
1253 cdns_writel(cdns, CDNS_MCP_CONFIG, val);
1254
1255 /* changes will be committed later */
1256 return 0;
1257 }
1258 EXPORT_SYMBOL(sdw_cdns_init);
1259
cdns_bus_conf(struct sdw_bus * bus,struct sdw_bus_params * params)1260 int cdns_bus_conf(struct sdw_bus *bus, struct sdw_bus_params *params)
1261 {
1262 struct sdw_master_prop *prop = &bus->prop;
1263 struct sdw_cdns *cdns = bus_to_cdns(bus);
1264 int mcp_clkctrl_off;
1265 int divider;
1266
1267 if (!params->curr_dr_freq) {
1268 dev_err(cdns->dev, "NULL curr_dr_freq\n");
1269 return -EINVAL;
1270 }
1271
1272 divider = prop->mclk_freq * SDW_DOUBLE_RATE_FACTOR /
1273 params->curr_dr_freq;
1274 divider--; /* divider is 1/(N+1) */
1275
1276 if (params->next_bank)
1277 mcp_clkctrl_off = CDNS_MCP_CLK_CTRL1;
1278 else
1279 mcp_clkctrl_off = CDNS_MCP_CLK_CTRL0;
1280
1281 cdns_updatel(cdns, mcp_clkctrl_off, CDNS_MCP_CLK_MCLKD_MASK, divider);
1282
1283 return 0;
1284 }
1285 EXPORT_SYMBOL(cdns_bus_conf);
1286
cdns_port_params(struct sdw_bus * bus,struct sdw_port_params * p_params,unsigned int bank)1287 static int cdns_port_params(struct sdw_bus *bus,
1288 struct sdw_port_params *p_params, unsigned int bank)
1289 {
1290 struct sdw_cdns *cdns = bus_to_cdns(bus);
1291 int dpn_config = 0, dpn_config_off;
1292
1293 if (bank)
1294 dpn_config_off = CDNS_DPN_B1_CONFIG(p_params->num);
1295 else
1296 dpn_config_off = CDNS_DPN_B0_CONFIG(p_params->num);
1297
1298 dpn_config = cdns_readl(cdns, dpn_config_off);
1299
1300 u32p_replace_bits(&dpn_config, (p_params->bps - 1), CDNS_DPN_CONFIG_WL);
1301 u32p_replace_bits(&dpn_config, p_params->flow_mode, CDNS_DPN_CONFIG_PORT_FLOW);
1302 u32p_replace_bits(&dpn_config, p_params->data_mode, CDNS_DPN_CONFIG_PORT_DAT);
1303
1304 cdns_writel(cdns, dpn_config_off, dpn_config);
1305
1306 return 0;
1307 }
1308
cdns_transport_params(struct sdw_bus * bus,struct sdw_transport_params * t_params,enum sdw_reg_bank bank)1309 static int cdns_transport_params(struct sdw_bus *bus,
1310 struct sdw_transport_params *t_params,
1311 enum sdw_reg_bank bank)
1312 {
1313 struct sdw_cdns *cdns = bus_to_cdns(bus);
1314 int dpn_offsetctrl = 0, dpn_offsetctrl_off;
1315 int dpn_config = 0, dpn_config_off;
1316 int dpn_hctrl = 0, dpn_hctrl_off;
1317 int num = t_params->port_num;
1318 int dpn_samplectrl_off;
1319
1320 /*
1321 * Note: Only full data port is supported on the Master side for
1322 * both PCM and PDM ports.
1323 */
1324
1325 if (bank) {
1326 dpn_config_off = CDNS_DPN_B1_CONFIG(num);
1327 dpn_samplectrl_off = CDNS_DPN_B1_SAMPLE_CTRL(num);
1328 dpn_hctrl_off = CDNS_DPN_B1_HCTRL(num);
1329 dpn_offsetctrl_off = CDNS_DPN_B1_OFFSET_CTRL(num);
1330 } else {
1331 dpn_config_off = CDNS_DPN_B0_CONFIG(num);
1332 dpn_samplectrl_off = CDNS_DPN_B0_SAMPLE_CTRL(num);
1333 dpn_hctrl_off = CDNS_DPN_B0_HCTRL(num);
1334 dpn_offsetctrl_off = CDNS_DPN_B0_OFFSET_CTRL(num);
1335 }
1336
1337 dpn_config = cdns_readl(cdns, dpn_config_off);
1338 u32p_replace_bits(&dpn_config, t_params->blk_grp_ctrl, CDNS_DPN_CONFIG_BGC);
1339 u32p_replace_bits(&dpn_config, t_params->blk_pkg_mode, CDNS_DPN_CONFIG_BPM);
1340 cdns_writel(cdns, dpn_config_off, dpn_config);
1341
1342 u32p_replace_bits(&dpn_offsetctrl, t_params->offset1, CDNS_DPN_OFFSET_CTRL_1);
1343 u32p_replace_bits(&dpn_offsetctrl, t_params->offset2, CDNS_DPN_OFFSET_CTRL_2);
1344 cdns_writel(cdns, dpn_offsetctrl_off, dpn_offsetctrl);
1345
1346 u32p_replace_bits(&dpn_hctrl, t_params->hstart, CDNS_DPN_HCTRL_HSTART);
1347 u32p_replace_bits(&dpn_hctrl, t_params->hstop, CDNS_DPN_HCTRL_HSTOP);
1348 u32p_replace_bits(&dpn_hctrl, t_params->lane_ctrl, CDNS_DPN_HCTRL_LCTRL);
1349
1350 cdns_writel(cdns, dpn_hctrl_off, dpn_hctrl);
1351 cdns_writel(cdns, dpn_samplectrl_off, (t_params->sample_interval - 1));
1352
1353 return 0;
1354 }
1355
cdns_port_enable(struct sdw_bus * bus,struct sdw_enable_ch * enable_ch,unsigned int bank)1356 static int cdns_port_enable(struct sdw_bus *bus,
1357 struct sdw_enable_ch *enable_ch, unsigned int bank)
1358 {
1359 struct sdw_cdns *cdns = bus_to_cdns(bus);
1360 int dpn_chnen_off, ch_mask;
1361
1362 if (bank)
1363 dpn_chnen_off = CDNS_DPN_B1_CH_EN(enable_ch->port_num);
1364 else
1365 dpn_chnen_off = CDNS_DPN_B0_CH_EN(enable_ch->port_num);
1366
1367 ch_mask = enable_ch->ch_mask * enable_ch->enable;
1368 cdns_writel(cdns, dpn_chnen_off, ch_mask);
1369
1370 return 0;
1371 }
1372
1373 static const struct sdw_master_port_ops cdns_port_ops = {
1374 .dpn_set_port_params = cdns_port_params,
1375 .dpn_set_port_transport_params = cdns_transport_params,
1376 .dpn_port_enable_ch = cdns_port_enable,
1377 };
1378
1379 /**
1380 * sdw_cdns_is_clock_stop: Check clock status
1381 *
1382 * @cdns: Cadence instance
1383 */
sdw_cdns_is_clock_stop(struct sdw_cdns * cdns)1384 bool sdw_cdns_is_clock_stop(struct sdw_cdns *cdns)
1385 {
1386 return !!(cdns_readl(cdns, CDNS_MCP_STAT) & CDNS_MCP_STAT_CLK_STOP);
1387 }
1388 EXPORT_SYMBOL(sdw_cdns_is_clock_stop);
1389
1390 /**
1391 * sdw_cdns_clock_stop: Cadence clock stop configuration routine
1392 *
1393 * @cdns: Cadence instance
1394 * @block_wake: prevent wakes if required by the platform
1395 */
sdw_cdns_clock_stop(struct sdw_cdns * cdns,bool block_wake)1396 int sdw_cdns_clock_stop(struct sdw_cdns *cdns, bool block_wake)
1397 {
1398 bool slave_present = false;
1399 struct sdw_slave *slave;
1400 int ret;
1401
1402 /* Check suspend status */
1403 if (sdw_cdns_is_clock_stop(cdns)) {
1404 dev_dbg(cdns->dev, "Clock is already stopped\n");
1405 return 0;
1406 }
1407
1408 /*
1409 * Before entering clock stop we mask the Slave
1410 * interrupts. This helps avoid having to deal with e.g. a
1411 * Slave becoming UNATTACHED while the clock is being stopped
1412 */
1413 cdns_enable_slave_interrupts(cdns, false);
1414
1415 /*
1416 * For specific platforms, it is required to be able to put
1417 * master into a state in which it ignores wake-up trials
1418 * in clock stop state
1419 */
1420 if (block_wake)
1421 cdns_updatel(cdns, CDNS_MCP_CONTROL,
1422 CDNS_MCP_CONTROL_BLOCK_WAKEUP,
1423 CDNS_MCP_CONTROL_BLOCK_WAKEUP);
1424
1425 list_for_each_entry(slave, &cdns->bus.slaves, node) {
1426 if (slave->status == SDW_SLAVE_ATTACHED ||
1427 slave->status == SDW_SLAVE_ALERT) {
1428 slave_present = true;
1429 break;
1430 }
1431 }
1432
1433 /*
1434 * This CMD_ACCEPT should be used when there are no devices
1435 * attached on the link when entering clock stop mode. If this is
1436 * not set and there is a broadcast write then the command ignored
1437 * will be treated as a failure
1438 */
1439 if (!slave_present)
1440 cdns_updatel(cdns, CDNS_MCP_CONTROL,
1441 CDNS_MCP_CONTROL_CMD_ACCEPT,
1442 CDNS_MCP_CONTROL_CMD_ACCEPT);
1443 else
1444 cdns_updatel(cdns, CDNS_MCP_CONTROL,
1445 CDNS_MCP_CONTROL_CMD_ACCEPT, 0);
1446
1447 /* commit changes */
1448 ret = cdns_config_update(cdns);
1449 if (ret < 0) {
1450 dev_err(cdns->dev, "%s: config_update failed\n", __func__);
1451 return ret;
1452 }
1453
1454 /* Prepare slaves for clock stop */
1455 if (slave_present) {
1456 ret = sdw_bus_prep_clk_stop(&cdns->bus);
1457 if (ret < 0 && ret != -ENODATA) {
1458 dev_err(cdns->dev, "prepare clock stop failed %d\n", ret);
1459 return ret;
1460 }
1461 }
1462
1463 /*
1464 * Enter clock stop mode and only report errors if there are
1465 * Slave devices present (ALERT or ATTACHED)
1466 */
1467 ret = sdw_bus_clk_stop(&cdns->bus);
1468 if (ret < 0 && slave_present && ret != -ENODATA) {
1469 dev_err(cdns->dev, "bus clock stop failed %d", ret);
1470 return ret;
1471 }
1472
1473 ret = cdns_set_wait(cdns, CDNS_MCP_STAT,
1474 CDNS_MCP_STAT_CLK_STOP,
1475 CDNS_MCP_STAT_CLK_STOP);
1476 if (ret < 0)
1477 dev_err(cdns->dev, "Clock stop failed %d\n", ret);
1478
1479 return ret;
1480 }
1481 EXPORT_SYMBOL(sdw_cdns_clock_stop);
1482
1483 /**
1484 * sdw_cdns_clock_restart: Cadence PM clock restart configuration routine
1485 *
1486 * @cdns: Cadence instance
1487 * @bus_reset: context may be lost while in low power modes and the bus
1488 * may require a Severe Reset and re-enumeration after a wake.
1489 */
sdw_cdns_clock_restart(struct sdw_cdns * cdns,bool bus_reset)1490 int sdw_cdns_clock_restart(struct sdw_cdns *cdns, bool bus_reset)
1491 {
1492 int ret;
1493
1494 /* unmask Slave interrupts that were masked when stopping the clock */
1495 cdns_enable_slave_interrupts(cdns, true);
1496
1497 ret = cdns_clear_bit(cdns, CDNS_MCP_CONTROL,
1498 CDNS_MCP_CONTROL_CLK_STOP_CLR);
1499 if (ret < 0) {
1500 dev_err(cdns->dev, "Couldn't exit from clock stop\n");
1501 return ret;
1502 }
1503
1504 ret = cdns_set_wait(cdns, CDNS_MCP_STAT, CDNS_MCP_STAT_CLK_STOP, 0);
1505 if (ret < 0) {
1506 dev_err(cdns->dev, "clock stop exit failed %d\n", ret);
1507 return ret;
1508 }
1509
1510 cdns_updatel(cdns, CDNS_MCP_CONTROL,
1511 CDNS_MCP_CONTROL_BLOCK_WAKEUP, 0);
1512
1513 /*
1514 * clear CMD_ACCEPT so that the command ignored
1515 * will be treated as a failure during a broadcast write
1516 */
1517 cdns_updatel(cdns, CDNS_MCP_CONTROL, CDNS_MCP_CONTROL_CMD_ACCEPT, 0);
1518
1519 if (!bus_reset) {
1520
1521 /* enable bus operations with clock and data */
1522 cdns_updatel(cdns, CDNS_MCP_CONFIG,
1523 CDNS_MCP_CONFIG_OP,
1524 CDNS_MCP_CONFIG_OP_NORMAL);
1525
1526 ret = cdns_config_update(cdns);
1527 if (ret < 0) {
1528 dev_err(cdns->dev, "%s: config_update failed\n", __func__);
1529 return ret;
1530 }
1531
1532 ret = sdw_bus_exit_clk_stop(&cdns->bus);
1533 if (ret < 0)
1534 dev_err(cdns->dev, "bus failed to exit clock stop %d\n", ret);
1535 }
1536
1537 return ret;
1538 }
1539 EXPORT_SYMBOL(sdw_cdns_clock_restart);
1540
1541 /**
1542 * sdw_cdns_probe() - Cadence probe routine
1543 * @cdns: Cadence instance
1544 */
sdw_cdns_probe(struct sdw_cdns * cdns)1545 int sdw_cdns_probe(struct sdw_cdns *cdns)
1546 {
1547 init_completion(&cdns->tx_complete);
1548 cdns->bus.port_ops = &cdns_port_ops;
1549
1550 INIT_WORK(&cdns->work, cdns_update_slave_status_work);
1551 return 0;
1552 }
1553 EXPORT_SYMBOL(sdw_cdns_probe);
1554
cdns_set_sdw_stream(struct snd_soc_dai * dai,void * stream,bool pcm,int direction)1555 int cdns_set_sdw_stream(struct snd_soc_dai *dai,
1556 void *stream, bool pcm, int direction)
1557 {
1558 struct sdw_cdns *cdns = snd_soc_dai_get_drvdata(dai);
1559 struct sdw_cdns_dma_data *dma;
1560
1561 if (stream) {
1562 /* first paranoia check */
1563 if (direction == SNDRV_PCM_STREAM_PLAYBACK)
1564 dma = dai->playback_dma_data;
1565 else
1566 dma = dai->capture_dma_data;
1567
1568 if (dma) {
1569 dev_err(dai->dev,
1570 "dma_data already allocated for dai %s\n",
1571 dai->name);
1572 return -EINVAL;
1573 }
1574
1575 /* allocate and set dma info */
1576 dma = kzalloc(sizeof(*dma), GFP_KERNEL);
1577 if (!dma)
1578 return -ENOMEM;
1579
1580 if (pcm)
1581 dma->stream_type = SDW_STREAM_PCM;
1582 else
1583 dma->stream_type = SDW_STREAM_PDM;
1584
1585 dma->bus = &cdns->bus;
1586 dma->link_id = cdns->instance;
1587
1588 dma->stream = stream;
1589
1590 if (direction == SNDRV_PCM_STREAM_PLAYBACK)
1591 dai->playback_dma_data = dma;
1592 else
1593 dai->capture_dma_data = dma;
1594 } else {
1595 /* for NULL stream we release allocated dma_data */
1596 if (direction == SNDRV_PCM_STREAM_PLAYBACK) {
1597 kfree(dai->playback_dma_data);
1598 dai->playback_dma_data = NULL;
1599 } else {
1600 kfree(dai->capture_dma_data);
1601 dai->capture_dma_data = NULL;
1602 }
1603 }
1604 return 0;
1605 }
1606 EXPORT_SYMBOL(cdns_set_sdw_stream);
1607
1608 /**
1609 * cdns_find_pdi() - Find a free PDI
1610 *
1611 * @cdns: Cadence instance
1612 * @offset: Starting offset
1613 * @num: Number of PDIs
1614 * @pdi: PDI instances
1615 * @dai_id: DAI id
1616 *
1617 * Find a PDI for a given PDI array. The PDI num and dai_id are
1618 * expected to match, return NULL otherwise.
1619 */
cdns_find_pdi(struct sdw_cdns * cdns,unsigned int offset,unsigned int num,struct sdw_cdns_pdi * pdi,int dai_id)1620 static struct sdw_cdns_pdi *cdns_find_pdi(struct sdw_cdns *cdns,
1621 unsigned int offset,
1622 unsigned int num,
1623 struct sdw_cdns_pdi *pdi,
1624 int dai_id)
1625 {
1626 int i;
1627
1628 for (i = offset; i < offset + num; i++)
1629 if (pdi[i].num == dai_id)
1630 return &pdi[i];
1631
1632 return NULL;
1633 }
1634
1635 /**
1636 * sdw_cdns_config_stream: Configure a stream
1637 *
1638 * @cdns: Cadence instance
1639 * @ch: Channel count
1640 * @dir: Data direction
1641 * @pdi: PDI to be used
1642 */
sdw_cdns_config_stream(struct sdw_cdns * cdns,u32 ch,u32 dir,struct sdw_cdns_pdi * pdi)1643 void sdw_cdns_config_stream(struct sdw_cdns *cdns,
1644 u32 ch, u32 dir, struct sdw_cdns_pdi *pdi)
1645 {
1646 u32 offset, val = 0;
1647
1648 if (dir == SDW_DATA_DIR_RX) {
1649 val = CDNS_PORTCTRL_DIRN;
1650
1651 if (cdns->bus.params.m_data_mode != SDW_PORT_DATA_MODE_NORMAL)
1652 val |= CDNS_PORTCTRL_TEST_FAILED;
1653 }
1654 offset = CDNS_PORTCTRL + pdi->num * CDNS_PORT_OFFSET;
1655 cdns_updatel(cdns, offset,
1656 CDNS_PORTCTRL_DIRN | CDNS_PORTCTRL_TEST_FAILED,
1657 val);
1658
1659 val = pdi->num;
1660 val |= CDNS_PDI_CONFIG_SOFT_RESET;
1661 val |= FIELD_PREP(CDNS_PDI_CONFIG_CHANNEL, (1 << ch) - 1);
1662 cdns_writel(cdns, CDNS_PDI_CONFIG(pdi->num), val);
1663 }
1664 EXPORT_SYMBOL(sdw_cdns_config_stream);
1665
1666 /**
1667 * sdw_cdns_alloc_pdi() - Allocate a PDI
1668 *
1669 * @cdns: Cadence instance
1670 * @stream: Stream to be allocated
1671 * @ch: Channel count
1672 * @dir: Data direction
1673 * @dai_id: DAI id
1674 */
sdw_cdns_alloc_pdi(struct sdw_cdns * cdns,struct sdw_cdns_streams * stream,u32 ch,u32 dir,int dai_id)1675 struct sdw_cdns_pdi *sdw_cdns_alloc_pdi(struct sdw_cdns *cdns,
1676 struct sdw_cdns_streams *stream,
1677 u32 ch, u32 dir, int dai_id)
1678 {
1679 struct sdw_cdns_pdi *pdi = NULL;
1680
1681 if (dir == SDW_DATA_DIR_RX)
1682 pdi = cdns_find_pdi(cdns, 0, stream->num_in, stream->in,
1683 dai_id);
1684 else
1685 pdi = cdns_find_pdi(cdns, 0, stream->num_out, stream->out,
1686 dai_id);
1687
1688 /* check if we found a PDI, else find in bi-directional */
1689 if (!pdi)
1690 pdi = cdns_find_pdi(cdns, 2, stream->num_bd, stream->bd,
1691 dai_id);
1692
1693 if (pdi) {
1694 pdi->l_ch_num = 0;
1695 pdi->h_ch_num = ch - 1;
1696 pdi->dir = dir;
1697 pdi->ch_count = ch;
1698 }
1699
1700 return pdi;
1701 }
1702 EXPORT_SYMBOL(sdw_cdns_alloc_pdi);
1703
1704 MODULE_LICENSE("Dual BSD/GPL");
1705 MODULE_DESCRIPTION("Cadence Soundwire Library");
1706