1 // SPDX-License-Identifier: (GPL-2.0 OR BSD-3-Clause)
2 // Copyright(c) 2015-18 Intel Corporation.
3
4 /*
5 * stream.c - SoundWire Bus stream operations.
6 */
7
8 #include <linux/delay.h>
9 #include <linux/device.h>
10 #include <linux/init.h>
11 #include <linux/module.h>
12 #include <linux/mod_devicetable.h>
13 #include <linux/slab.h>
14 #include <linux/soundwire/sdw_registers.h>
15 #include <linux/soundwire/sdw.h>
16 #include "bus.h"
17
18 /*
19 * Array of supported rows and columns as per MIPI SoundWire Specification 1.1
20 *
21 * The rows are arranged as per the array index value programmed
22 * in register. The index 15 has dummy value 0 in order to fill hole.
23 */
24 int sdw_rows[SDW_FRAME_ROWS] = {48, 50, 60, 64, 75, 80, 125, 147,
25 96, 100, 120, 128, 150, 160, 250, 0,
26 192, 200, 240, 256, 72, 144, 90, 180};
27
28 int sdw_cols[SDW_FRAME_COLS] = {2, 4, 6, 8, 10, 12, 14, 16};
29
sdw_find_col_index(int col)30 int sdw_find_col_index(int col)
31 {
32 int i;
33
34 for (i = 0; i < SDW_FRAME_COLS; i++) {
35 if (sdw_cols[i] == col)
36 return i;
37 }
38
39 pr_warn("Requested column not found, selecting lowest column no: 2\n");
40 return 0;
41 }
42 EXPORT_SYMBOL(sdw_find_col_index);
43
sdw_find_row_index(int row)44 int sdw_find_row_index(int row)
45 {
46 int i;
47
48 for (i = 0; i < SDW_FRAME_ROWS; i++) {
49 if (sdw_rows[i] == row)
50 return i;
51 }
52
53 pr_warn("Requested row not found, selecting lowest row no: 48\n");
54 return 0;
55 }
56 EXPORT_SYMBOL(sdw_find_row_index);
57
_sdw_program_slave_port_params(struct sdw_bus * bus,struct sdw_slave * slave,struct sdw_transport_params * t_params,enum sdw_dpn_type type)58 static int _sdw_program_slave_port_params(struct sdw_bus *bus,
59 struct sdw_slave *slave,
60 struct sdw_transport_params *t_params,
61 enum sdw_dpn_type type)
62 {
63 u32 addr1, addr2, addr3, addr4;
64 int ret;
65 u16 wbuf;
66
67 if (bus->params.next_bank) {
68 addr1 = SDW_DPN_OFFSETCTRL2_B1(t_params->port_num);
69 addr2 = SDW_DPN_BLOCKCTRL3_B1(t_params->port_num);
70 addr3 = SDW_DPN_SAMPLECTRL2_B1(t_params->port_num);
71 addr4 = SDW_DPN_HCTRL_B1(t_params->port_num);
72 } else {
73 addr1 = SDW_DPN_OFFSETCTRL2_B0(t_params->port_num);
74 addr2 = SDW_DPN_BLOCKCTRL3_B0(t_params->port_num);
75 addr3 = SDW_DPN_SAMPLECTRL2_B0(t_params->port_num);
76 addr4 = SDW_DPN_HCTRL_B0(t_params->port_num);
77 }
78
79 /* Program DPN_OffsetCtrl2 registers */
80 ret = sdw_write(slave, addr1, t_params->offset2);
81 if (ret < 0) {
82 dev_err(bus->dev, "DPN_OffsetCtrl2 register write failed\n");
83 return ret;
84 }
85
86 /* Program DPN_BlockCtrl3 register */
87 ret = sdw_write(slave, addr2, t_params->blk_pkg_mode);
88 if (ret < 0) {
89 dev_err(bus->dev, "DPN_BlockCtrl3 register write failed\n");
90 return ret;
91 }
92
93 /*
94 * Data ports are FULL, SIMPLE and REDUCED. This function handles
95 * FULL and REDUCED only and beyond this point only FULL is
96 * handled, so bail out if we are not FULL data port type
97 */
98 if (type != SDW_DPN_FULL)
99 return ret;
100
101 /* Program DPN_SampleCtrl2 register */
102 wbuf = (t_params->sample_interval - 1);
103 wbuf &= SDW_DPN_SAMPLECTRL_HIGH;
104 wbuf >>= SDW_REG_SHIFT(SDW_DPN_SAMPLECTRL_HIGH);
105
106 ret = sdw_write(slave, addr3, wbuf);
107 if (ret < 0) {
108 dev_err(bus->dev, "DPN_SampleCtrl2 register write failed\n");
109 return ret;
110 }
111
112 /* Program DPN_HCtrl register */
113 wbuf = t_params->hstart;
114 wbuf <<= SDW_REG_SHIFT(SDW_DPN_HCTRL_HSTART);
115 wbuf |= t_params->hstop;
116
117 ret = sdw_write(slave, addr4, wbuf);
118 if (ret < 0)
119 dev_err(bus->dev, "DPN_HCtrl register write failed\n");
120
121 return ret;
122 }
123
sdw_program_slave_port_params(struct sdw_bus * bus,struct sdw_slave_runtime * s_rt,struct sdw_port_runtime * p_rt)124 static int sdw_program_slave_port_params(struct sdw_bus *bus,
125 struct sdw_slave_runtime *s_rt,
126 struct sdw_port_runtime *p_rt)
127 {
128 struct sdw_transport_params *t_params = &p_rt->transport_params;
129 struct sdw_port_params *p_params = &p_rt->port_params;
130 struct sdw_slave_prop *slave_prop = &s_rt->slave->prop;
131 u32 addr1, addr2, addr3, addr4, addr5, addr6;
132 struct sdw_dpn_prop *dpn_prop;
133 int ret;
134 u8 wbuf;
135
136 dpn_prop = sdw_get_slave_dpn_prop(s_rt->slave,
137 s_rt->direction,
138 t_params->port_num);
139 if (!dpn_prop)
140 return -EINVAL;
141
142 addr1 = SDW_DPN_PORTCTRL(t_params->port_num);
143 addr2 = SDW_DPN_BLOCKCTRL1(t_params->port_num);
144
145 if (bus->params.next_bank) {
146 addr3 = SDW_DPN_SAMPLECTRL1_B1(t_params->port_num);
147 addr4 = SDW_DPN_OFFSETCTRL1_B1(t_params->port_num);
148 addr5 = SDW_DPN_BLOCKCTRL2_B1(t_params->port_num);
149 addr6 = SDW_DPN_LANECTRL_B1(t_params->port_num);
150
151 } else {
152 addr3 = SDW_DPN_SAMPLECTRL1_B0(t_params->port_num);
153 addr4 = SDW_DPN_OFFSETCTRL1_B0(t_params->port_num);
154 addr5 = SDW_DPN_BLOCKCTRL2_B0(t_params->port_num);
155 addr6 = SDW_DPN_LANECTRL_B0(t_params->port_num);
156 }
157
158 /* Program DPN_PortCtrl register */
159 wbuf = p_params->data_mode << SDW_REG_SHIFT(SDW_DPN_PORTCTRL_DATAMODE);
160 wbuf |= p_params->flow_mode;
161
162 ret = sdw_update(s_rt->slave, addr1, 0xF, wbuf);
163 if (ret < 0) {
164 dev_err(&s_rt->slave->dev,
165 "DPN_PortCtrl register write failed for port %d\n",
166 t_params->port_num);
167 return ret;
168 }
169
170 /* Program DPN_BlockCtrl1 register */
171 ret = sdw_write(s_rt->slave, addr2, (p_params->bps - 1));
172 if (ret < 0) {
173 dev_err(&s_rt->slave->dev,
174 "DPN_BlockCtrl1 register write failed for port %d\n",
175 t_params->port_num);
176 return ret;
177 }
178
179 /* Program DPN_SampleCtrl1 register */
180 wbuf = (t_params->sample_interval - 1) & SDW_DPN_SAMPLECTRL_LOW;
181 ret = sdw_write(s_rt->slave, addr3, wbuf);
182 if (ret < 0) {
183 dev_err(&s_rt->slave->dev,
184 "DPN_SampleCtrl1 register write failed for port %d\n",
185 t_params->port_num);
186 return ret;
187 }
188
189 /* Program DPN_OffsetCtrl1 registers */
190 ret = sdw_write(s_rt->slave, addr4, t_params->offset1);
191 if (ret < 0) {
192 dev_err(&s_rt->slave->dev,
193 "DPN_OffsetCtrl1 register write failed for port %d\n",
194 t_params->port_num);
195 return ret;
196 }
197
198 /* Program DPN_BlockCtrl2 register*/
199 if (t_params->blk_grp_ctrl_valid) {
200 ret = sdw_write(s_rt->slave, addr5, t_params->blk_grp_ctrl);
201 if (ret < 0) {
202 dev_err(&s_rt->slave->dev,
203 "DPN_BlockCtrl2 reg write failed for port %d\n",
204 t_params->port_num);
205 return ret;
206 }
207 }
208
209 /* program DPN_LaneCtrl register */
210 if (slave_prop->lane_control_support) {
211 ret = sdw_write(s_rt->slave, addr6, t_params->lane_ctrl);
212 if (ret < 0) {
213 dev_err(&s_rt->slave->dev,
214 "DPN_LaneCtrl register write failed for port %d\n",
215 t_params->port_num);
216 return ret;
217 }
218 }
219
220 if (dpn_prop->type != SDW_DPN_SIMPLE) {
221 ret = _sdw_program_slave_port_params(bus, s_rt->slave,
222 t_params, dpn_prop->type);
223 if (ret < 0)
224 dev_err(&s_rt->slave->dev,
225 "Transport reg write failed for port: %d\n",
226 t_params->port_num);
227 }
228
229 return ret;
230 }
231
sdw_program_master_port_params(struct sdw_bus * bus,struct sdw_port_runtime * p_rt)232 static int sdw_program_master_port_params(struct sdw_bus *bus,
233 struct sdw_port_runtime *p_rt)
234 {
235 int ret;
236
237 /*
238 * we need to set transport and port parameters for the port.
239 * Transport parameters refers to the sample interval, offsets and
240 * hstart/stop etc of the data. Port parameters refers to word
241 * length, flow mode etc of the port
242 */
243 ret = bus->port_ops->dpn_set_port_transport_params(bus,
244 &p_rt->transport_params,
245 bus->params.next_bank);
246 if (ret < 0)
247 return ret;
248
249 return bus->port_ops->dpn_set_port_params(bus,
250 &p_rt->port_params,
251 bus->params.next_bank);
252 }
253
254 /**
255 * sdw_program_port_params() - Programs transport parameters of Master(s)
256 * and Slave(s)
257 *
258 * @m_rt: Master stream runtime
259 */
sdw_program_port_params(struct sdw_master_runtime * m_rt)260 static int sdw_program_port_params(struct sdw_master_runtime *m_rt)
261 {
262 struct sdw_slave_runtime *s_rt = NULL;
263 struct sdw_bus *bus = m_rt->bus;
264 struct sdw_port_runtime *p_rt;
265 int ret = 0;
266
267 /* Program transport & port parameters for Slave(s) */
268 list_for_each_entry(s_rt, &m_rt->slave_rt_list, m_rt_node) {
269 list_for_each_entry(p_rt, &s_rt->port_list, port_node) {
270 ret = sdw_program_slave_port_params(bus, s_rt, p_rt);
271 if (ret < 0)
272 return ret;
273 }
274 }
275
276 /* Program transport & port parameters for Master(s) */
277 list_for_each_entry(p_rt, &m_rt->port_list, port_node) {
278 ret = sdw_program_master_port_params(bus, p_rt);
279 if (ret < 0)
280 return ret;
281 }
282
283 return 0;
284 }
285
286 /**
287 * sdw_enable_disable_slave_ports: Enable/disable slave data port
288 *
289 * @bus: bus instance
290 * @s_rt: slave runtime
291 * @p_rt: port runtime
292 * @en: enable or disable operation
293 *
294 * This function only sets the enable/disable bits in the relevant bank, the
295 * actual enable/disable is done with a bank switch
296 */
sdw_enable_disable_slave_ports(struct sdw_bus * bus,struct sdw_slave_runtime * s_rt,struct sdw_port_runtime * p_rt,bool en)297 static int sdw_enable_disable_slave_ports(struct sdw_bus *bus,
298 struct sdw_slave_runtime *s_rt,
299 struct sdw_port_runtime *p_rt,
300 bool en)
301 {
302 struct sdw_transport_params *t_params = &p_rt->transport_params;
303 u32 addr;
304 int ret;
305
306 if (bus->params.next_bank)
307 addr = SDW_DPN_CHANNELEN_B1(p_rt->num);
308 else
309 addr = SDW_DPN_CHANNELEN_B0(p_rt->num);
310
311 /*
312 * Since bus doesn't support sharing a port across two streams,
313 * it is safe to reset this register
314 */
315 if (en)
316 ret = sdw_update(s_rt->slave, addr, 0xFF, p_rt->ch_mask);
317 else
318 ret = sdw_update(s_rt->slave, addr, 0xFF, 0x0);
319
320 if (ret < 0)
321 dev_err(&s_rt->slave->dev,
322 "Slave chn_en reg write failed:%d port:%d\n",
323 ret, t_params->port_num);
324
325 return ret;
326 }
327
sdw_enable_disable_master_ports(struct sdw_master_runtime * m_rt,struct sdw_port_runtime * p_rt,bool en)328 static int sdw_enable_disable_master_ports(struct sdw_master_runtime *m_rt,
329 struct sdw_port_runtime *p_rt,
330 bool en)
331 {
332 struct sdw_transport_params *t_params = &p_rt->transport_params;
333 struct sdw_bus *bus = m_rt->bus;
334 struct sdw_enable_ch enable_ch;
335 int ret;
336
337 enable_ch.port_num = p_rt->num;
338 enable_ch.ch_mask = p_rt->ch_mask;
339 enable_ch.enable = en;
340
341 /* Perform Master port channel(s) enable/disable */
342 if (bus->port_ops->dpn_port_enable_ch) {
343 ret = bus->port_ops->dpn_port_enable_ch(bus,
344 &enable_ch,
345 bus->params.next_bank);
346 if (ret < 0) {
347 dev_err(bus->dev,
348 "Master chn_en write failed:%d port:%d\n",
349 ret, t_params->port_num);
350 return ret;
351 }
352 } else {
353 dev_err(bus->dev,
354 "dpn_port_enable_ch not supported, %s failed\n",
355 en ? "enable" : "disable");
356 return -EINVAL;
357 }
358
359 return 0;
360 }
361
362 /**
363 * sdw_enable_disable_ports() - Enable/disable port(s) for Master and
364 * Slave(s)
365 *
366 * @m_rt: Master stream runtime
367 * @en: mode (enable/disable)
368 */
sdw_enable_disable_ports(struct sdw_master_runtime * m_rt,bool en)369 static int sdw_enable_disable_ports(struct sdw_master_runtime *m_rt, bool en)
370 {
371 struct sdw_port_runtime *s_port, *m_port;
372 struct sdw_slave_runtime *s_rt;
373 int ret = 0;
374
375 /* Enable/Disable Slave port(s) */
376 list_for_each_entry(s_rt, &m_rt->slave_rt_list, m_rt_node) {
377 list_for_each_entry(s_port, &s_rt->port_list, port_node) {
378 ret = sdw_enable_disable_slave_ports(m_rt->bus, s_rt,
379 s_port, en);
380 if (ret < 0)
381 return ret;
382 }
383 }
384
385 /* Enable/Disable Master port(s) */
386 list_for_each_entry(m_port, &m_rt->port_list, port_node) {
387 ret = sdw_enable_disable_master_ports(m_rt, m_port, en);
388 if (ret < 0)
389 return ret;
390 }
391
392 return 0;
393 }
394
sdw_do_port_prep(struct sdw_slave_runtime * s_rt,struct sdw_prepare_ch prep_ch,enum sdw_port_prep_ops cmd)395 static int sdw_do_port_prep(struct sdw_slave_runtime *s_rt,
396 struct sdw_prepare_ch prep_ch,
397 enum sdw_port_prep_ops cmd)
398 {
399 const struct sdw_slave_ops *ops = s_rt->slave->ops;
400 int ret;
401
402 if (ops->port_prep) {
403 ret = ops->port_prep(s_rt->slave, &prep_ch, cmd);
404 if (ret < 0) {
405 dev_err(&s_rt->slave->dev,
406 "Slave Port Prep cmd %d failed: %d\n",
407 cmd, ret);
408 return ret;
409 }
410 }
411
412 return 0;
413 }
414
sdw_prep_deprep_slave_ports(struct sdw_bus * bus,struct sdw_slave_runtime * s_rt,struct sdw_port_runtime * p_rt,bool prep)415 static int sdw_prep_deprep_slave_ports(struct sdw_bus *bus,
416 struct sdw_slave_runtime *s_rt,
417 struct sdw_port_runtime *p_rt,
418 bool prep)
419 {
420 struct completion *port_ready;
421 struct sdw_dpn_prop *dpn_prop;
422 struct sdw_prepare_ch prep_ch;
423 unsigned int time_left;
424 bool intr = false;
425 int ret = 0, val;
426 u32 addr;
427
428 prep_ch.num = p_rt->num;
429 prep_ch.ch_mask = p_rt->ch_mask;
430
431 dpn_prop = sdw_get_slave_dpn_prop(s_rt->slave,
432 s_rt->direction,
433 prep_ch.num);
434 if (!dpn_prop) {
435 dev_err(bus->dev,
436 "Slave Port:%d properties not found\n", prep_ch.num);
437 return -EINVAL;
438 }
439
440 prep_ch.prepare = prep;
441
442 prep_ch.bank = bus->params.next_bank;
443
444 if (dpn_prop->imp_def_interrupts || !dpn_prop->simple_ch_prep_sm)
445 intr = true;
446
447 /*
448 * Enable interrupt before Port prepare.
449 * For Port de-prepare, it is assumed that port
450 * was prepared earlier
451 */
452 if (prep && intr) {
453 ret = sdw_configure_dpn_intr(s_rt->slave, p_rt->num, prep,
454 dpn_prop->imp_def_interrupts);
455 if (ret < 0)
456 return ret;
457 }
458
459 /* Inform slave about the impending port prepare */
460 sdw_do_port_prep(s_rt, prep_ch, SDW_OPS_PORT_PRE_PREP);
461
462 /* Prepare Slave port implementing CP_SM */
463 if (!dpn_prop->simple_ch_prep_sm) {
464 addr = SDW_DPN_PREPARECTRL(p_rt->num);
465
466 if (prep)
467 ret = sdw_update(s_rt->slave, addr,
468 0xFF, p_rt->ch_mask);
469 else
470 ret = sdw_update(s_rt->slave, addr, 0xFF, 0x0);
471
472 if (ret < 0) {
473 dev_err(&s_rt->slave->dev,
474 "Slave prep_ctrl reg write failed\n");
475 return ret;
476 }
477
478 /* Wait for completion on port ready */
479 port_ready = &s_rt->slave->port_ready[prep_ch.num];
480 time_left = wait_for_completion_timeout(port_ready,
481 msecs_to_jiffies(dpn_prop->ch_prep_timeout));
482
483 val = sdw_read(s_rt->slave, SDW_DPN_PREPARESTATUS(p_rt->num));
484 val &= p_rt->ch_mask;
485 if (!time_left || val) {
486 dev_err(&s_rt->slave->dev,
487 "Chn prep failed for port:%d\n", prep_ch.num);
488 return -ETIMEDOUT;
489 }
490 }
491
492 /* Inform slaves about ports prepared */
493 sdw_do_port_prep(s_rt, prep_ch, SDW_OPS_PORT_POST_PREP);
494
495 /* Disable interrupt after Port de-prepare */
496 if (!prep && intr)
497 ret = sdw_configure_dpn_intr(s_rt->slave, p_rt->num, prep,
498 dpn_prop->imp_def_interrupts);
499
500 return ret;
501 }
502
sdw_prep_deprep_master_ports(struct sdw_master_runtime * m_rt,struct sdw_port_runtime * p_rt,bool prep)503 static int sdw_prep_deprep_master_ports(struct sdw_master_runtime *m_rt,
504 struct sdw_port_runtime *p_rt,
505 bool prep)
506 {
507 struct sdw_transport_params *t_params = &p_rt->transport_params;
508 struct sdw_bus *bus = m_rt->bus;
509 const struct sdw_master_port_ops *ops = bus->port_ops;
510 struct sdw_prepare_ch prep_ch;
511 int ret = 0;
512
513 prep_ch.num = p_rt->num;
514 prep_ch.ch_mask = p_rt->ch_mask;
515 prep_ch.prepare = prep; /* Prepare/De-prepare */
516 prep_ch.bank = bus->params.next_bank;
517
518 /* Pre-prepare/Pre-deprepare port(s) */
519 if (ops->dpn_port_prep) {
520 ret = ops->dpn_port_prep(bus, &prep_ch);
521 if (ret < 0) {
522 dev_err(bus->dev, "Port prepare failed for port:%d\n",
523 t_params->port_num);
524 return ret;
525 }
526 }
527
528 return ret;
529 }
530
531 /**
532 * sdw_prep_deprep_ports() - Prepare/De-prepare port(s) for Master(s) and
533 * Slave(s)
534 *
535 * @m_rt: Master runtime handle
536 * @prep: Prepare or De-prepare
537 */
sdw_prep_deprep_ports(struct sdw_master_runtime * m_rt,bool prep)538 static int sdw_prep_deprep_ports(struct sdw_master_runtime *m_rt, bool prep)
539 {
540 struct sdw_slave_runtime *s_rt;
541 struct sdw_port_runtime *p_rt;
542 int ret = 0;
543
544 /* Prepare/De-prepare Slave port(s) */
545 list_for_each_entry(s_rt, &m_rt->slave_rt_list, m_rt_node) {
546 list_for_each_entry(p_rt, &s_rt->port_list, port_node) {
547 ret = sdw_prep_deprep_slave_ports(m_rt->bus, s_rt,
548 p_rt, prep);
549 if (ret < 0)
550 return ret;
551 }
552 }
553
554 /* Prepare/De-prepare Master port(s) */
555 list_for_each_entry(p_rt, &m_rt->port_list, port_node) {
556 ret = sdw_prep_deprep_master_ports(m_rt, p_rt, prep);
557 if (ret < 0)
558 return ret;
559 }
560
561 return ret;
562 }
563
564 /**
565 * sdw_notify_config() - Notify bus configuration
566 *
567 * @m_rt: Master runtime handle
568 *
569 * This function notifies the Master(s) and Slave(s) of the
570 * new bus configuration.
571 */
sdw_notify_config(struct sdw_master_runtime * m_rt)572 static int sdw_notify_config(struct sdw_master_runtime *m_rt)
573 {
574 struct sdw_slave_runtime *s_rt;
575 struct sdw_bus *bus = m_rt->bus;
576 struct sdw_slave *slave;
577 int ret = 0;
578
579 if (bus->ops->set_bus_conf) {
580 ret = bus->ops->set_bus_conf(bus, &bus->params);
581 if (ret < 0)
582 return ret;
583 }
584
585 list_for_each_entry(s_rt, &m_rt->slave_rt_list, m_rt_node) {
586 slave = s_rt->slave;
587
588 if (slave->ops->bus_config) {
589 ret = slave->ops->bus_config(slave, &bus->params);
590 if (ret < 0)
591 dev_err(bus->dev, "Notify Slave: %d failed\n",
592 slave->dev_num);
593 return ret;
594 }
595 }
596
597 return ret;
598 }
599
600 /**
601 * sdw_program_params() - Program transport and port parameters for Master(s)
602 * and Slave(s)
603 *
604 * @bus: SDW bus instance
605 */
sdw_program_params(struct sdw_bus * bus)606 static int sdw_program_params(struct sdw_bus *bus)
607 {
608 struct sdw_master_runtime *m_rt;
609 int ret = 0;
610
611 list_for_each_entry(m_rt, &bus->m_rt_list, bus_node) {
612 ret = sdw_program_port_params(m_rt);
613 if (ret < 0) {
614 dev_err(bus->dev,
615 "Program transport params failed: %d\n", ret);
616 return ret;
617 }
618
619 ret = sdw_notify_config(m_rt);
620 if (ret < 0) {
621 dev_err(bus->dev,
622 "Notify bus config failed: %d\n", ret);
623 return ret;
624 }
625
626 /* Enable port(s) on alternate bank for all active streams */
627 if (m_rt->stream->state != SDW_STREAM_ENABLED)
628 continue;
629
630 ret = sdw_enable_disable_ports(m_rt, true);
631 if (ret < 0) {
632 dev_err(bus->dev, "Enable channel failed: %d\n", ret);
633 return ret;
634 }
635 }
636
637 return ret;
638 }
639
sdw_bank_switch(struct sdw_bus * bus,int m_rt_count)640 static int sdw_bank_switch(struct sdw_bus *bus, int m_rt_count)
641 {
642 int col_index, row_index;
643 bool multi_link;
644 struct sdw_msg *wr_msg;
645 u8 *wbuf;
646 int ret;
647 u16 addr;
648
649 wr_msg = kzalloc(sizeof(*wr_msg), GFP_KERNEL);
650 if (!wr_msg)
651 return -ENOMEM;
652
653 bus->defer_msg.msg = wr_msg;
654
655 wbuf = kzalloc(sizeof(*wbuf), GFP_KERNEL);
656 if (!wbuf) {
657 ret = -ENOMEM;
658 goto error_1;
659 }
660
661 /* Get row and column index to program register */
662 col_index = sdw_find_col_index(bus->params.col);
663 row_index = sdw_find_row_index(bus->params.row);
664 wbuf[0] = col_index | (row_index << 3);
665
666 if (bus->params.next_bank)
667 addr = SDW_SCP_FRAMECTRL_B1;
668 else
669 addr = SDW_SCP_FRAMECTRL_B0;
670
671 sdw_fill_msg(wr_msg, NULL, addr, 1, SDW_BROADCAST_DEV_NUM,
672 SDW_MSG_FLAG_WRITE, wbuf);
673 wr_msg->ssp_sync = true;
674
675 /*
676 * Set the multi_link flag only when both the hardware supports
677 * and there is a stream handled by multiple masters
678 */
679 multi_link = bus->multi_link && (m_rt_count > 1);
680
681 if (multi_link)
682 ret = sdw_transfer_defer(bus, wr_msg, &bus->defer_msg);
683 else
684 ret = sdw_transfer(bus, wr_msg);
685
686 if (ret < 0) {
687 dev_err(bus->dev, "Slave frame_ctrl reg write failed\n");
688 goto error;
689 }
690
691 if (!multi_link) {
692 kfree(wr_msg);
693 kfree(wbuf);
694 bus->defer_msg.msg = NULL;
695 bus->params.curr_bank = !bus->params.curr_bank;
696 bus->params.next_bank = !bus->params.next_bank;
697 }
698
699 return 0;
700
701 error:
702 kfree(wbuf);
703 error_1:
704 kfree(wr_msg);
705 return ret;
706 }
707
708 /**
709 * sdw_ml_sync_bank_switch: Multilink register bank switch
710 *
711 * @bus: SDW bus instance
712 *
713 * Caller function should free the buffers on error
714 */
sdw_ml_sync_bank_switch(struct sdw_bus * bus)715 static int sdw_ml_sync_bank_switch(struct sdw_bus *bus)
716 {
717 unsigned long time_left;
718
719 if (!bus->multi_link)
720 return 0;
721
722 /* Wait for completion of transfer */
723 time_left = wait_for_completion_timeout(&bus->defer_msg.complete,
724 bus->bank_switch_timeout);
725
726 if (!time_left) {
727 dev_err(bus->dev, "Controller Timed out on bank switch\n");
728 return -ETIMEDOUT;
729 }
730
731 bus->params.curr_bank = !bus->params.curr_bank;
732 bus->params.next_bank = !bus->params.next_bank;
733
734 if (bus->defer_msg.msg) {
735 kfree(bus->defer_msg.msg->buf);
736 kfree(bus->defer_msg.msg);
737 }
738
739 return 0;
740 }
741
do_bank_switch(struct sdw_stream_runtime * stream)742 static int do_bank_switch(struct sdw_stream_runtime *stream)
743 {
744 struct sdw_master_runtime *m_rt;
745 const struct sdw_master_ops *ops;
746 struct sdw_bus *bus;
747 bool multi_link = false;
748 int ret = 0;
749
750 list_for_each_entry(m_rt, &stream->master_list, stream_node) {
751 bus = m_rt->bus;
752 ops = bus->ops;
753
754 if (bus->multi_link) {
755 multi_link = true;
756 mutex_lock(&bus->msg_lock);
757 }
758
759 /* Pre-bank switch */
760 if (ops->pre_bank_switch) {
761 ret = ops->pre_bank_switch(bus);
762 if (ret < 0) {
763 dev_err(bus->dev,
764 "Pre bank switch op failed: %d\n", ret);
765 goto msg_unlock;
766 }
767 }
768
769 /*
770 * Perform Bank switch operation.
771 * For multi link cases, the actual bank switch is
772 * synchronized across all Masters and happens later as a
773 * part of post_bank_switch ops.
774 */
775 ret = sdw_bank_switch(bus, stream->m_rt_count);
776 if (ret < 0) {
777 dev_err(bus->dev, "Bank switch failed: %d\n", ret);
778 goto error;
779 }
780 }
781
782 /*
783 * For multi link cases, it is expected that the bank switch is
784 * triggered by the post_bank_switch for the first Master in the list
785 * and for the other Masters the post_bank_switch() should return doing
786 * nothing.
787 */
788 list_for_each_entry(m_rt, &stream->master_list, stream_node) {
789 bus = m_rt->bus;
790 ops = bus->ops;
791
792 /* Post-bank switch */
793 if (ops->post_bank_switch) {
794 ret = ops->post_bank_switch(bus);
795 if (ret < 0) {
796 dev_err(bus->dev,
797 "Post bank switch op failed: %d\n",
798 ret);
799 goto error;
800 }
801 } else if (bus->multi_link && stream->m_rt_count > 1) {
802 dev_err(bus->dev,
803 "Post bank switch ops not implemented\n");
804 goto error;
805 }
806
807 /* Set the bank switch timeout to default, if not set */
808 if (!bus->bank_switch_timeout)
809 bus->bank_switch_timeout = DEFAULT_BANK_SWITCH_TIMEOUT;
810
811 /* Check if bank switch was successful */
812 ret = sdw_ml_sync_bank_switch(bus);
813 if (ret < 0) {
814 dev_err(bus->dev,
815 "multi link bank switch failed: %d\n", ret);
816 goto error;
817 }
818
819 if (bus->multi_link)
820 mutex_unlock(&bus->msg_lock);
821 }
822
823 return ret;
824
825 error:
826 list_for_each_entry(m_rt, &stream->master_list, stream_node) {
827 bus = m_rt->bus;
828
829 kfree(bus->defer_msg.msg->buf);
830 kfree(bus->defer_msg.msg);
831 }
832
833 msg_unlock:
834
835 if (multi_link) {
836 list_for_each_entry(m_rt, &stream->master_list, stream_node) {
837 bus = m_rt->bus;
838 if (mutex_is_locked(&bus->msg_lock))
839 mutex_unlock(&bus->msg_lock);
840 }
841 }
842
843 return ret;
844 }
845
846 /**
847 * sdw_release_stream() - Free the assigned stream runtime
848 *
849 * @stream: SoundWire stream runtime
850 *
851 * sdw_release_stream should be called only once per stream
852 */
sdw_release_stream(struct sdw_stream_runtime * stream)853 void sdw_release_stream(struct sdw_stream_runtime *stream)
854 {
855 kfree(stream);
856 }
857 EXPORT_SYMBOL(sdw_release_stream);
858
859 /**
860 * sdw_alloc_stream() - Allocate and return stream runtime
861 *
862 * @stream_name: SoundWire stream name
863 *
864 * Allocates a SoundWire stream runtime instance.
865 * sdw_alloc_stream should be called only once per stream. Typically
866 * invoked from ALSA/ASoC machine/platform driver.
867 */
sdw_alloc_stream(const char * stream_name)868 struct sdw_stream_runtime *sdw_alloc_stream(const char *stream_name)
869 {
870 struct sdw_stream_runtime *stream;
871
872 stream = kzalloc(sizeof(*stream), GFP_KERNEL);
873 if (!stream)
874 return NULL;
875
876 stream->name = stream_name;
877 INIT_LIST_HEAD(&stream->master_list);
878 stream->state = SDW_STREAM_ALLOCATED;
879 stream->m_rt_count = 0;
880
881 return stream;
882 }
883 EXPORT_SYMBOL(sdw_alloc_stream);
884
885 static struct sdw_master_runtime
sdw_find_master_rt(struct sdw_bus * bus,struct sdw_stream_runtime * stream)886 *sdw_find_master_rt(struct sdw_bus *bus,
887 struct sdw_stream_runtime *stream)
888 {
889 struct sdw_master_runtime *m_rt;
890
891 /* Retrieve Bus handle if already available */
892 list_for_each_entry(m_rt, &stream->master_list, stream_node) {
893 if (m_rt->bus == bus)
894 return m_rt;
895 }
896
897 return NULL;
898 }
899
900 /**
901 * sdw_alloc_master_rt() - Allocates and initialize Master runtime handle
902 *
903 * @bus: SDW bus instance
904 * @stream_config: Stream configuration
905 * @stream: Stream runtime handle.
906 *
907 * This function is to be called with bus_lock held.
908 */
909 static struct sdw_master_runtime
sdw_alloc_master_rt(struct sdw_bus * bus,struct sdw_stream_config * stream_config,struct sdw_stream_runtime * stream)910 *sdw_alloc_master_rt(struct sdw_bus *bus,
911 struct sdw_stream_config *stream_config,
912 struct sdw_stream_runtime *stream)
913 {
914 struct sdw_master_runtime *m_rt;
915
916 /*
917 * check if Master is already allocated (as a result of Slave adding
918 * it first), if so skip allocation and go to configure
919 */
920 m_rt = sdw_find_master_rt(bus, stream);
921 if (m_rt)
922 goto stream_config;
923
924 m_rt = kzalloc(sizeof(*m_rt), GFP_KERNEL);
925 if (!m_rt)
926 return NULL;
927
928 /* Initialization of Master runtime handle */
929 INIT_LIST_HEAD(&m_rt->port_list);
930 INIT_LIST_HEAD(&m_rt->slave_rt_list);
931 list_add_tail(&m_rt->stream_node, &stream->master_list);
932
933 list_add_tail(&m_rt->bus_node, &bus->m_rt_list);
934
935 stream_config:
936 m_rt->ch_count = stream_config->ch_count;
937 m_rt->bus = bus;
938 m_rt->stream = stream;
939 m_rt->direction = stream_config->direction;
940
941 return m_rt;
942 }
943
944 /**
945 * sdw_alloc_slave_rt() - Allocate and initialize Slave runtime handle.
946 *
947 * @slave: Slave handle
948 * @stream_config: Stream configuration
949 * @stream: Stream runtime handle
950 *
951 * This function is to be called with bus_lock held.
952 */
953 static struct sdw_slave_runtime
sdw_alloc_slave_rt(struct sdw_slave * slave,struct sdw_stream_config * stream_config,struct sdw_stream_runtime * stream)954 *sdw_alloc_slave_rt(struct sdw_slave *slave,
955 struct sdw_stream_config *stream_config,
956 struct sdw_stream_runtime *stream)
957 {
958 struct sdw_slave_runtime *s_rt;
959
960 s_rt = kzalloc(sizeof(*s_rt), GFP_KERNEL);
961 if (!s_rt)
962 return NULL;
963
964 INIT_LIST_HEAD(&s_rt->port_list);
965 s_rt->ch_count = stream_config->ch_count;
966 s_rt->direction = stream_config->direction;
967 s_rt->slave = slave;
968
969 return s_rt;
970 }
971
sdw_master_port_release(struct sdw_bus * bus,struct sdw_master_runtime * m_rt)972 static void sdw_master_port_release(struct sdw_bus *bus,
973 struct sdw_master_runtime *m_rt)
974 {
975 struct sdw_port_runtime *p_rt, *_p_rt;
976
977 list_for_each_entry_safe(p_rt, _p_rt, &m_rt->port_list, port_node) {
978 list_del(&p_rt->port_node);
979 kfree(p_rt);
980 }
981 }
982
sdw_slave_port_release(struct sdw_bus * bus,struct sdw_slave * slave,struct sdw_stream_runtime * stream)983 static void sdw_slave_port_release(struct sdw_bus *bus,
984 struct sdw_slave *slave,
985 struct sdw_stream_runtime *stream)
986 {
987 struct sdw_port_runtime *p_rt, *_p_rt;
988 struct sdw_master_runtime *m_rt;
989 struct sdw_slave_runtime *s_rt;
990
991 list_for_each_entry(m_rt, &stream->master_list, stream_node) {
992 list_for_each_entry(s_rt, &m_rt->slave_rt_list, m_rt_node) {
993 if (s_rt->slave != slave)
994 continue;
995
996 list_for_each_entry_safe(p_rt, _p_rt,
997 &s_rt->port_list, port_node) {
998 list_del(&p_rt->port_node);
999 kfree(p_rt);
1000 }
1001 }
1002 }
1003 }
1004
1005 /**
1006 * sdw_release_slave_stream() - Free Slave(s) runtime handle
1007 *
1008 * @slave: Slave handle.
1009 * @stream: Stream runtime handle.
1010 *
1011 * This function is to be called with bus_lock held.
1012 */
sdw_release_slave_stream(struct sdw_slave * slave,struct sdw_stream_runtime * stream)1013 static void sdw_release_slave_stream(struct sdw_slave *slave,
1014 struct sdw_stream_runtime *stream)
1015 {
1016 struct sdw_slave_runtime *s_rt, *_s_rt;
1017 struct sdw_master_runtime *m_rt;
1018
1019 list_for_each_entry(m_rt, &stream->master_list, stream_node) {
1020 /* Retrieve Slave runtime handle */
1021 list_for_each_entry_safe(s_rt, _s_rt,
1022 &m_rt->slave_rt_list, m_rt_node) {
1023 if (s_rt->slave == slave) {
1024 list_del(&s_rt->m_rt_node);
1025 kfree(s_rt);
1026 return;
1027 }
1028 }
1029 }
1030 }
1031
1032 /**
1033 * sdw_release_master_stream() - Free Master runtime handle
1034 *
1035 * @m_rt: Master runtime node
1036 * @stream: Stream runtime handle.
1037 *
1038 * This function is to be called with bus_lock held
1039 * It frees the Master runtime handle and associated Slave(s) runtime
1040 * handle. If this is called first then sdw_release_slave_stream() will have
1041 * no effect as Slave(s) runtime handle would already be freed up.
1042 */
sdw_release_master_stream(struct sdw_master_runtime * m_rt,struct sdw_stream_runtime * stream)1043 static void sdw_release_master_stream(struct sdw_master_runtime *m_rt,
1044 struct sdw_stream_runtime *stream)
1045 {
1046 struct sdw_slave_runtime *s_rt, *_s_rt;
1047
1048 list_for_each_entry_safe(s_rt, _s_rt, &m_rt->slave_rt_list, m_rt_node) {
1049 sdw_slave_port_release(s_rt->slave->bus, s_rt->slave, stream);
1050 sdw_release_slave_stream(s_rt->slave, stream);
1051 }
1052
1053 list_del(&m_rt->stream_node);
1054 list_del(&m_rt->bus_node);
1055 kfree(m_rt);
1056 }
1057
1058 /**
1059 * sdw_stream_remove_master() - Remove master from sdw_stream
1060 *
1061 * @bus: SDW Bus instance
1062 * @stream: SoundWire stream
1063 *
1064 * This removes and frees port_rt and master_rt from a stream
1065 */
sdw_stream_remove_master(struct sdw_bus * bus,struct sdw_stream_runtime * stream)1066 int sdw_stream_remove_master(struct sdw_bus *bus,
1067 struct sdw_stream_runtime *stream)
1068 {
1069 struct sdw_master_runtime *m_rt, *_m_rt;
1070
1071 mutex_lock(&bus->bus_lock);
1072
1073 list_for_each_entry_safe(m_rt, _m_rt,
1074 &stream->master_list, stream_node) {
1075 if (m_rt->bus != bus)
1076 continue;
1077
1078 sdw_master_port_release(bus, m_rt);
1079 sdw_release_master_stream(m_rt, stream);
1080 stream->m_rt_count--;
1081 }
1082
1083 if (list_empty(&stream->master_list))
1084 stream->state = SDW_STREAM_RELEASED;
1085
1086 mutex_unlock(&bus->bus_lock);
1087
1088 return 0;
1089 }
1090 EXPORT_SYMBOL(sdw_stream_remove_master);
1091
1092 /**
1093 * sdw_stream_remove_slave() - Remove slave from sdw_stream
1094 *
1095 * @slave: SDW Slave instance
1096 * @stream: SoundWire stream
1097 *
1098 * This removes and frees port_rt and slave_rt from a stream
1099 */
sdw_stream_remove_slave(struct sdw_slave * slave,struct sdw_stream_runtime * stream)1100 int sdw_stream_remove_slave(struct sdw_slave *slave,
1101 struct sdw_stream_runtime *stream)
1102 {
1103 mutex_lock(&slave->bus->bus_lock);
1104
1105 sdw_slave_port_release(slave->bus, slave, stream);
1106 sdw_release_slave_stream(slave, stream);
1107
1108 mutex_unlock(&slave->bus->bus_lock);
1109
1110 return 0;
1111 }
1112 EXPORT_SYMBOL(sdw_stream_remove_slave);
1113
1114 /**
1115 * sdw_config_stream() - Configure the allocated stream
1116 *
1117 * @dev: SDW device
1118 * @stream: SoundWire stream
1119 * @stream_config: Stream configuration for audio stream
1120 * @is_slave: is API called from Slave or Master
1121 *
1122 * This function is to be called with bus_lock held.
1123 */
sdw_config_stream(struct device * dev,struct sdw_stream_runtime * stream,struct sdw_stream_config * stream_config,bool is_slave)1124 static int sdw_config_stream(struct device *dev,
1125 struct sdw_stream_runtime *stream,
1126 struct sdw_stream_config *stream_config,
1127 bool is_slave)
1128 {
1129 /*
1130 * Update the stream rate, channel and bps based on data
1131 * source. For more than one data source (multilink),
1132 * match the rate, bps, stream type and increment number of channels.
1133 *
1134 * If rate/bps is zero, it means the values are not set, so skip
1135 * comparison and allow the value to be set and stored in stream
1136 */
1137 if (stream->params.rate &&
1138 stream->params.rate != stream_config->frame_rate) {
1139 dev_err(dev, "rate not matching, stream:%s\n", stream->name);
1140 return -EINVAL;
1141 }
1142
1143 if (stream->params.bps &&
1144 stream->params.bps != stream_config->bps) {
1145 dev_err(dev, "bps not matching, stream:%s\n", stream->name);
1146 return -EINVAL;
1147 }
1148
1149 stream->type = stream_config->type;
1150 stream->params.rate = stream_config->frame_rate;
1151 stream->params.bps = stream_config->bps;
1152
1153 /* TODO: Update this check during Device-device support */
1154 if (is_slave)
1155 stream->params.ch_count += stream_config->ch_count;
1156
1157 return 0;
1158 }
1159
sdw_is_valid_port_range(struct device * dev,struct sdw_port_runtime * p_rt)1160 static int sdw_is_valid_port_range(struct device *dev,
1161 struct sdw_port_runtime *p_rt)
1162 {
1163 if (!SDW_VALID_PORT_RANGE(p_rt->num)) {
1164 dev_err(dev,
1165 "SoundWire: Invalid port number :%d\n", p_rt->num);
1166 return -EINVAL;
1167 }
1168
1169 return 0;
1170 }
1171
1172 static struct sdw_port_runtime
sdw_port_alloc(struct device * dev,struct sdw_port_config * port_config,int port_index)1173 *sdw_port_alloc(struct device *dev,
1174 struct sdw_port_config *port_config,
1175 int port_index)
1176 {
1177 struct sdw_port_runtime *p_rt;
1178
1179 p_rt = kzalloc(sizeof(*p_rt), GFP_KERNEL);
1180 if (!p_rt)
1181 return NULL;
1182
1183 p_rt->ch_mask = port_config[port_index].ch_mask;
1184 p_rt->num = port_config[port_index].num;
1185
1186 return p_rt;
1187 }
1188
sdw_master_port_config(struct sdw_bus * bus,struct sdw_master_runtime * m_rt,struct sdw_port_config * port_config,unsigned int num_ports)1189 static int sdw_master_port_config(struct sdw_bus *bus,
1190 struct sdw_master_runtime *m_rt,
1191 struct sdw_port_config *port_config,
1192 unsigned int num_ports)
1193 {
1194 struct sdw_port_runtime *p_rt;
1195 int i;
1196
1197 /* Iterate for number of ports to perform initialization */
1198 for (i = 0; i < num_ports; i++) {
1199 p_rt = sdw_port_alloc(bus->dev, port_config, i);
1200 if (!p_rt)
1201 return -ENOMEM;
1202
1203 /*
1204 * TODO: Check port capabilities for requested
1205 * configuration (audio mode support)
1206 */
1207
1208 list_add_tail(&p_rt->port_node, &m_rt->port_list);
1209 }
1210
1211 return 0;
1212 }
1213
sdw_slave_port_config(struct sdw_slave * slave,struct sdw_slave_runtime * s_rt,struct sdw_port_config * port_config,unsigned int num_config)1214 static int sdw_slave_port_config(struct sdw_slave *slave,
1215 struct sdw_slave_runtime *s_rt,
1216 struct sdw_port_config *port_config,
1217 unsigned int num_config)
1218 {
1219 struct sdw_port_runtime *p_rt;
1220 int i, ret;
1221
1222 /* Iterate for number of ports to perform initialization */
1223 for (i = 0; i < num_config; i++) {
1224 p_rt = sdw_port_alloc(&slave->dev, port_config, i);
1225 if (!p_rt)
1226 return -ENOMEM;
1227
1228 /*
1229 * TODO: Check valid port range as defined by DisCo/
1230 * slave
1231 */
1232 ret = sdw_is_valid_port_range(&slave->dev, p_rt);
1233 if (ret < 0) {
1234 kfree(p_rt);
1235 return ret;
1236 }
1237
1238 /*
1239 * TODO: Check port capabilities for requested
1240 * configuration (audio mode support)
1241 */
1242
1243 list_add_tail(&p_rt->port_node, &s_rt->port_list);
1244 }
1245
1246 return 0;
1247 }
1248
1249 /**
1250 * sdw_stream_add_master() - Allocate and add master runtime to a stream
1251 *
1252 * @bus: SDW Bus instance
1253 * @stream_config: Stream configuration for audio stream
1254 * @port_config: Port configuration for audio stream
1255 * @num_ports: Number of ports
1256 * @stream: SoundWire stream
1257 */
sdw_stream_add_master(struct sdw_bus * bus,struct sdw_stream_config * stream_config,struct sdw_port_config * port_config,unsigned int num_ports,struct sdw_stream_runtime * stream)1258 int sdw_stream_add_master(struct sdw_bus *bus,
1259 struct sdw_stream_config *stream_config,
1260 struct sdw_port_config *port_config,
1261 unsigned int num_ports,
1262 struct sdw_stream_runtime *stream)
1263 {
1264 struct sdw_master_runtime *m_rt;
1265 int ret;
1266
1267 mutex_lock(&bus->bus_lock);
1268
1269 /*
1270 * For multi link streams, add the second master only if
1271 * the bus supports it.
1272 * Check if bus->multi_link is set
1273 */
1274 if (!bus->multi_link && stream->m_rt_count > 0) {
1275 dev_err(bus->dev,
1276 "Multilink not supported, link %d\n", bus->link_id);
1277 ret = -EINVAL;
1278 goto unlock;
1279 }
1280
1281 m_rt = sdw_alloc_master_rt(bus, stream_config, stream);
1282 if (!m_rt) {
1283 dev_err(bus->dev,
1284 "Master runtime config failed for stream:%s\n",
1285 stream->name);
1286 ret = -ENOMEM;
1287 goto unlock;
1288 }
1289
1290 ret = sdw_config_stream(bus->dev, stream, stream_config, false);
1291 if (ret)
1292 goto stream_error;
1293
1294 ret = sdw_master_port_config(bus, m_rt, port_config, num_ports);
1295 if (ret)
1296 goto stream_error;
1297
1298 stream->m_rt_count++;
1299
1300 goto unlock;
1301
1302 stream_error:
1303 sdw_release_master_stream(m_rt, stream);
1304 unlock:
1305 mutex_unlock(&bus->bus_lock);
1306 return ret;
1307 }
1308 EXPORT_SYMBOL(sdw_stream_add_master);
1309
1310 /**
1311 * sdw_stream_add_slave() - Allocate and add master/slave runtime to a stream
1312 *
1313 * @slave: SDW Slave instance
1314 * @stream_config: Stream configuration for audio stream
1315 * @stream: SoundWire stream
1316 * @port_config: Port configuration for audio stream
1317 * @num_ports: Number of ports
1318 *
1319 * It is expected that Slave is added before adding Master
1320 * to the Stream.
1321 *
1322 */
sdw_stream_add_slave(struct sdw_slave * slave,struct sdw_stream_config * stream_config,struct sdw_port_config * port_config,unsigned int num_ports,struct sdw_stream_runtime * stream)1323 int sdw_stream_add_slave(struct sdw_slave *slave,
1324 struct sdw_stream_config *stream_config,
1325 struct sdw_port_config *port_config,
1326 unsigned int num_ports,
1327 struct sdw_stream_runtime *stream)
1328 {
1329 struct sdw_slave_runtime *s_rt;
1330 struct sdw_master_runtime *m_rt;
1331 int ret;
1332
1333 mutex_lock(&slave->bus->bus_lock);
1334
1335 /*
1336 * If this API is invoked by Slave first then m_rt is not valid.
1337 * So, allocate m_rt and add Slave to it.
1338 */
1339 m_rt = sdw_alloc_master_rt(slave->bus, stream_config, stream);
1340 if (!m_rt) {
1341 dev_err(&slave->dev,
1342 "alloc master runtime failed for stream:%s\n",
1343 stream->name);
1344 ret = -ENOMEM;
1345 goto error;
1346 }
1347
1348 s_rt = sdw_alloc_slave_rt(slave, stream_config, stream);
1349 if (!s_rt) {
1350 dev_err(&slave->dev,
1351 "Slave runtime config failed for stream:%s\n",
1352 stream->name);
1353 ret = -ENOMEM;
1354 goto stream_error;
1355 }
1356
1357 ret = sdw_config_stream(&slave->dev, stream, stream_config, true);
1358 if (ret)
1359 goto stream_error;
1360
1361 list_add_tail(&s_rt->m_rt_node, &m_rt->slave_rt_list);
1362
1363 ret = sdw_slave_port_config(slave, s_rt, port_config, num_ports);
1364 if (ret)
1365 goto stream_error;
1366
1367 /*
1368 * Change stream state to CONFIGURED on first Slave add.
1369 * Bus is not aware of number of Slave(s) in a stream at this
1370 * point so cannot depend on all Slave(s) to be added in order to
1371 * change stream state to CONFIGURED.
1372 */
1373 stream->state = SDW_STREAM_CONFIGURED;
1374 goto error;
1375
1376 stream_error:
1377 /*
1378 * we hit error so cleanup the stream, release all Slave(s) and
1379 * Master runtime
1380 */
1381 sdw_release_master_stream(m_rt, stream);
1382 error:
1383 mutex_unlock(&slave->bus->bus_lock);
1384 return ret;
1385 }
1386 EXPORT_SYMBOL(sdw_stream_add_slave);
1387
1388 /**
1389 * sdw_get_slave_dpn_prop() - Get Slave port capabilities
1390 *
1391 * @slave: Slave handle
1392 * @direction: Data direction.
1393 * @port_num: Port number
1394 */
sdw_get_slave_dpn_prop(struct sdw_slave * slave,enum sdw_data_direction direction,unsigned int port_num)1395 struct sdw_dpn_prop *sdw_get_slave_dpn_prop(struct sdw_slave *slave,
1396 enum sdw_data_direction direction,
1397 unsigned int port_num)
1398 {
1399 struct sdw_dpn_prop *dpn_prop;
1400 u8 num_ports;
1401 int i;
1402
1403 if (direction == SDW_DATA_DIR_TX) {
1404 num_ports = hweight32(slave->prop.source_ports);
1405 dpn_prop = slave->prop.src_dpn_prop;
1406 } else {
1407 num_ports = hweight32(slave->prop.sink_ports);
1408 dpn_prop = slave->prop.sink_dpn_prop;
1409 }
1410
1411 for (i = 0; i < num_ports; i++) {
1412 if (dpn_prop[i].num == port_num)
1413 return &dpn_prop[i];
1414 }
1415
1416 return NULL;
1417 }
1418
1419 /**
1420 * sdw_acquire_bus_lock: Acquire bus lock for all Master runtime(s)
1421 *
1422 * @stream: SoundWire stream
1423 *
1424 * Acquire bus_lock for each of the master runtime(m_rt) part of this
1425 * stream to reconfigure the bus.
1426 * NOTE: This function is called from SoundWire stream ops and is
1427 * expected that a global lock is held before acquiring bus_lock.
1428 */
sdw_acquire_bus_lock(struct sdw_stream_runtime * stream)1429 static void sdw_acquire_bus_lock(struct sdw_stream_runtime *stream)
1430 {
1431 struct sdw_master_runtime *m_rt;
1432 struct sdw_bus *bus = NULL;
1433
1434 /* Iterate for all Master(s) in Master list */
1435 list_for_each_entry(m_rt, &stream->master_list, stream_node) {
1436 bus = m_rt->bus;
1437
1438 mutex_lock(&bus->bus_lock);
1439 }
1440 }
1441
1442 /**
1443 * sdw_release_bus_lock: Release bus lock for all Master runtime(s)
1444 *
1445 * @stream: SoundWire stream
1446 *
1447 * Release the previously held bus_lock after reconfiguring the bus.
1448 * NOTE: This function is called from SoundWire stream ops and is
1449 * expected that a global lock is held before releasing bus_lock.
1450 */
sdw_release_bus_lock(struct sdw_stream_runtime * stream)1451 static void sdw_release_bus_lock(struct sdw_stream_runtime *stream)
1452 {
1453 struct sdw_master_runtime *m_rt = NULL;
1454 struct sdw_bus *bus = NULL;
1455
1456 /* Iterate for all Master(s) in Master list */
1457 list_for_each_entry_reverse(m_rt, &stream->master_list, stream_node) {
1458 bus = m_rt->bus;
1459 mutex_unlock(&bus->bus_lock);
1460 }
1461 }
1462
_sdw_prepare_stream(struct sdw_stream_runtime * stream)1463 static int _sdw_prepare_stream(struct sdw_stream_runtime *stream)
1464 {
1465 struct sdw_master_runtime *m_rt;
1466 struct sdw_bus *bus = NULL;
1467 struct sdw_master_prop *prop;
1468 struct sdw_bus_params params;
1469 int ret;
1470
1471 /* Prepare Master(s) and Slave(s) port(s) associated with stream */
1472 list_for_each_entry(m_rt, &stream->master_list, stream_node) {
1473 bus = m_rt->bus;
1474 prop = &bus->prop;
1475 memcpy(¶ms, &bus->params, sizeof(params));
1476
1477 /* TODO: Support Asynchronous mode */
1478 if ((prop->max_clk_freq % stream->params.rate) != 0) {
1479 dev_err(bus->dev, "Async mode not supported\n");
1480 return -EINVAL;
1481 }
1482
1483 /* Increment cumulative bus bandwidth */
1484 /* TODO: Update this during Device-Device support */
1485 bus->params.bandwidth += m_rt->stream->params.rate *
1486 m_rt->ch_count * m_rt->stream->params.bps;
1487
1488 /* Compute params */
1489 if (bus->compute_params) {
1490 ret = bus->compute_params(bus);
1491 if (ret < 0) {
1492 dev_err(bus->dev, "Compute params failed: %d",
1493 ret);
1494 return ret;
1495 }
1496 }
1497
1498 /* Program params */
1499 ret = sdw_program_params(bus);
1500 if (ret < 0) {
1501 dev_err(bus->dev, "Program params failed: %d\n", ret);
1502 goto restore_params;
1503 }
1504 }
1505
1506 if (!bus) {
1507 pr_err("Configuration error in %s\n", __func__);
1508 return -EINVAL;
1509 }
1510
1511 ret = do_bank_switch(stream);
1512 if (ret < 0) {
1513 dev_err(bus->dev, "Bank switch failed: %d\n", ret);
1514 goto restore_params;
1515 }
1516
1517 list_for_each_entry(m_rt, &stream->master_list, stream_node) {
1518 bus = m_rt->bus;
1519
1520 /* Prepare port(s) on the new clock configuration */
1521 ret = sdw_prep_deprep_ports(m_rt, true);
1522 if (ret < 0) {
1523 dev_err(bus->dev, "Prepare port(s) failed ret = %d\n",
1524 ret);
1525 return ret;
1526 }
1527 }
1528
1529 stream->state = SDW_STREAM_PREPARED;
1530
1531 return ret;
1532
1533 restore_params:
1534 memcpy(&bus->params, ¶ms, sizeof(params));
1535 return ret;
1536 }
1537
1538 /**
1539 * sdw_prepare_stream() - Prepare SoundWire stream
1540 *
1541 * @stream: Soundwire stream
1542 *
1543 * Documentation/driver-api/soundwire/stream.rst explains this API in detail
1544 */
sdw_prepare_stream(struct sdw_stream_runtime * stream)1545 int sdw_prepare_stream(struct sdw_stream_runtime *stream)
1546 {
1547 int ret = 0;
1548
1549 if (!stream) {
1550 pr_err("SoundWire: Handle not found for stream\n");
1551 return -EINVAL;
1552 }
1553
1554 sdw_acquire_bus_lock(stream);
1555
1556 ret = _sdw_prepare_stream(stream);
1557 if (ret < 0)
1558 pr_err("Prepare for stream:%s failed: %d\n", stream->name, ret);
1559
1560 sdw_release_bus_lock(stream);
1561 return ret;
1562 }
1563 EXPORT_SYMBOL(sdw_prepare_stream);
1564
_sdw_enable_stream(struct sdw_stream_runtime * stream)1565 static int _sdw_enable_stream(struct sdw_stream_runtime *stream)
1566 {
1567 struct sdw_master_runtime *m_rt;
1568 struct sdw_bus *bus = NULL;
1569 int ret;
1570
1571 /* Enable Master(s) and Slave(s) port(s) associated with stream */
1572 list_for_each_entry(m_rt, &stream->master_list, stream_node) {
1573 bus = m_rt->bus;
1574
1575 /* Program params */
1576 ret = sdw_program_params(bus);
1577 if (ret < 0) {
1578 dev_err(bus->dev, "Program params failed: %d\n", ret);
1579 return ret;
1580 }
1581
1582 /* Enable port(s) */
1583 ret = sdw_enable_disable_ports(m_rt, true);
1584 if (ret < 0) {
1585 dev_err(bus->dev,
1586 "Enable port(s) failed ret: %d\n", ret);
1587 return ret;
1588 }
1589 }
1590
1591 if (!bus) {
1592 pr_err("Configuration error in %s\n", __func__);
1593 return -EINVAL;
1594 }
1595
1596 ret = do_bank_switch(stream);
1597 if (ret < 0) {
1598 dev_err(bus->dev, "Bank switch failed: %d\n", ret);
1599 return ret;
1600 }
1601
1602 stream->state = SDW_STREAM_ENABLED;
1603 return 0;
1604 }
1605
1606 /**
1607 * sdw_enable_stream() - Enable SoundWire stream
1608 *
1609 * @stream: Soundwire stream
1610 *
1611 * Documentation/driver-api/soundwire/stream.rst explains this API in detail
1612 */
sdw_enable_stream(struct sdw_stream_runtime * stream)1613 int sdw_enable_stream(struct sdw_stream_runtime *stream)
1614 {
1615 int ret;
1616
1617 if (!stream) {
1618 pr_err("SoundWire: Handle not found for stream\n");
1619 return -EINVAL;
1620 }
1621
1622 sdw_acquire_bus_lock(stream);
1623
1624 ret = _sdw_enable_stream(stream);
1625 if (ret < 0)
1626 pr_err("Enable for stream:%s failed: %d\n", stream->name, ret);
1627
1628 sdw_release_bus_lock(stream);
1629 return ret;
1630 }
1631 EXPORT_SYMBOL(sdw_enable_stream);
1632
_sdw_disable_stream(struct sdw_stream_runtime * stream)1633 static int _sdw_disable_stream(struct sdw_stream_runtime *stream)
1634 {
1635 struct sdw_master_runtime *m_rt;
1636 int ret;
1637
1638 list_for_each_entry(m_rt, &stream->master_list, stream_node) {
1639 struct sdw_bus *bus = m_rt->bus;
1640
1641 /* Disable port(s) */
1642 ret = sdw_enable_disable_ports(m_rt, false);
1643 if (ret < 0) {
1644 dev_err(bus->dev, "Disable port(s) failed: %d\n", ret);
1645 return ret;
1646 }
1647 }
1648 stream->state = SDW_STREAM_DISABLED;
1649
1650 list_for_each_entry(m_rt, &stream->master_list, stream_node) {
1651 struct sdw_bus *bus = m_rt->bus;
1652
1653 /* Program params */
1654 ret = sdw_program_params(bus);
1655 if (ret < 0) {
1656 dev_err(bus->dev, "Program params failed: %d\n", ret);
1657 return ret;
1658 }
1659 }
1660
1661 ret = do_bank_switch(stream);
1662 if (ret < 0) {
1663 pr_err("Bank switch failed: %d\n", ret);
1664 return ret;
1665 }
1666
1667 /* make sure alternate bank (previous current) is also disabled */
1668 list_for_each_entry(m_rt, &stream->master_list, stream_node) {
1669 struct sdw_bus *bus = m_rt->bus;
1670
1671 /* Disable port(s) */
1672 ret = sdw_enable_disable_ports(m_rt, false);
1673 if (ret < 0) {
1674 dev_err(bus->dev, "Disable port(s) failed: %d\n", ret);
1675 return ret;
1676 }
1677 }
1678
1679 return 0;
1680 }
1681
1682 /**
1683 * sdw_disable_stream() - Disable SoundWire stream
1684 *
1685 * @stream: Soundwire stream
1686 *
1687 * Documentation/driver-api/soundwire/stream.rst explains this API in detail
1688 */
sdw_disable_stream(struct sdw_stream_runtime * stream)1689 int sdw_disable_stream(struct sdw_stream_runtime *stream)
1690 {
1691 int ret;
1692
1693 if (!stream) {
1694 pr_err("SoundWire: Handle not found for stream\n");
1695 return -EINVAL;
1696 }
1697
1698 sdw_acquire_bus_lock(stream);
1699
1700 ret = _sdw_disable_stream(stream);
1701 if (ret < 0)
1702 pr_err("Disable for stream:%s failed: %d\n", stream->name, ret);
1703
1704 sdw_release_bus_lock(stream);
1705 return ret;
1706 }
1707 EXPORT_SYMBOL(sdw_disable_stream);
1708
_sdw_deprepare_stream(struct sdw_stream_runtime * stream)1709 static int _sdw_deprepare_stream(struct sdw_stream_runtime *stream)
1710 {
1711 struct sdw_master_runtime *m_rt;
1712 struct sdw_bus *bus;
1713 int ret = 0;
1714
1715 list_for_each_entry(m_rt, &stream->master_list, stream_node) {
1716 bus = m_rt->bus;
1717 /* De-prepare port(s) */
1718 ret = sdw_prep_deprep_ports(m_rt, false);
1719 if (ret < 0) {
1720 dev_err(bus->dev,
1721 "De-prepare port(s) failed: %d\n", ret);
1722 return ret;
1723 }
1724
1725 /* TODO: Update this during Device-Device support */
1726 bus->params.bandwidth -= m_rt->stream->params.rate *
1727 m_rt->ch_count * m_rt->stream->params.bps;
1728
1729 /* Program params */
1730 ret = sdw_program_params(bus);
1731 if (ret < 0) {
1732 dev_err(bus->dev, "Program params failed: %d\n", ret);
1733 return ret;
1734 }
1735 }
1736
1737 stream->state = SDW_STREAM_DEPREPARED;
1738 return do_bank_switch(stream);
1739 }
1740
1741 /**
1742 * sdw_deprepare_stream() - Deprepare SoundWire stream
1743 *
1744 * @stream: Soundwire stream
1745 *
1746 * Documentation/driver-api/soundwire/stream.rst explains this API in detail
1747 */
sdw_deprepare_stream(struct sdw_stream_runtime * stream)1748 int sdw_deprepare_stream(struct sdw_stream_runtime *stream)
1749 {
1750 int ret;
1751
1752 if (!stream) {
1753 pr_err("SoundWire: Handle not found for stream\n");
1754 return -EINVAL;
1755 }
1756
1757 sdw_acquire_bus_lock(stream);
1758 ret = _sdw_deprepare_stream(stream);
1759 if (ret < 0)
1760 pr_err("De-prepare for stream:%d failed: %d\n", ret, ret);
1761
1762 sdw_release_bus_lock(stream);
1763 return ret;
1764 }
1765 EXPORT_SYMBOL(sdw_deprepare_stream);
1766