1 // SPDX-License-Identifier: (GPL-2.0 OR BSD-3-Clause)
2 // Copyright(c) 2015-18 Intel Corporation.
5 * stream.c - SoundWire Bus stream operations.
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>
19 * Array of supported rows and columns as per MIPI SoundWire Specification 1.1
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.
24 int 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};
28 int cols[SDW_FRAME_COLS] = {2, 4, 6, 8, 10, 12, 14, 16};
30 static int sdw_find_col_index(int col)
34 for (i = 0; i < SDW_FRAME_COLS; i++) {
39 pr_warn("Requested column not found, selecting lowest column no: 2\n");
43 static int sdw_find_row_index(int row)
47 for (i = 0; i < SDW_FRAME_ROWS; i++) {
52 pr_warn("Requested row not found, selecting lowest row no: 48\n");
56 static int _sdw_program_slave_port_params(struct sdw_bus *bus,
57 struct sdw_slave *slave,
58 struct sdw_transport_params *t_params,
59 enum sdw_dpn_type type)
61 u32 addr1, addr2, addr3, addr4;
65 if (bus->params.next_bank) {
66 addr1 = SDW_DPN_OFFSETCTRL2_B1(t_params->port_num);
67 addr2 = SDW_DPN_BLOCKCTRL3_B1(t_params->port_num);
68 addr3 = SDW_DPN_SAMPLECTRL2_B1(t_params->port_num);
69 addr4 = SDW_DPN_HCTRL_B1(t_params->port_num);
71 addr1 = SDW_DPN_OFFSETCTRL2_B0(t_params->port_num);
72 addr2 = SDW_DPN_BLOCKCTRL3_B0(t_params->port_num);
73 addr3 = SDW_DPN_SAMPLECTRL2_B0(t_params->port_num);
74 addr4 = SDW_DPN_HCTRL_B0(t_params->port_num);
77 /* Program DPN_OffsetCtrl2 registers */
78 ret = sdw_write(slave, addr1, t_params->offset2);
80 dev_err(bus->dev, "DPN_OffsetCtrl2 register write failed\n");
84 /* Program DPN_BlockCtrl3 register */
85 ret = sdw_write(slave, addr2, t_params->blk_pkg_mode);
87 dev_err(bus->dev, "DPN_BlockCtrl3 register write failed\n");
92 * Data ports are FULL, SIMPLE and REDUCED. This function handles
93 * FULL and REDUCED only and beyond this point only FULL is
94 * handled, so bail out if we are not FULL data port type
96 if (type != SDW_DPN_FULL)
99 /* Program DPN_SampleCtrl2 register */
100 wbuf = (t_params->sample_interval - 1);
101 wbuf &= SDW_DPN_SAMPLECTRL_HIGH;
102 wbuf >>= SDW_REG_SHIFT(SDW_DPN_SAMPLECTRL_HIGH);
104 ret = sdw_write(slave, addr3, wbuf);
106 dev_err(bus->dev, "DPN_SampleCtrl2 register write failed\n");
110 /* Program DPN_HCtrl register */
111 wbuf = t_params->hstart;
112 wbuf <<= SDW_REG_SHIFT(SDW_DPN_HCTRL_HSTART);
113 wbuf |= t_params->hstop;
115 ret = sdw_write(slave, addr4, wbuf);
117 dev_err(bus->dev, "DPN_HCtrl register write failed\n");
122 static int sdw_program_slave_port_params(struct sdw_bus *bus,
123 struct sdw_slave_runtime *s_rt,
124 struct sdw_port_runtime *p_rt)
126 struct sdw_transport_params *t_params = &p_rt->transport_params;
127 struct sdw_port_params *p_params = &p_rt->port_params;
128 struct sdw_slave_prop *slave_prop = &s_rt->slave->prop;
129 u32 addr1, addr2, addr3, addr4, addr5, addr6;
130 struct sdw_dpn_prop *dpn_prop;
134 dpn_prop = sdw_get_slave_dpn_prop(s_rt->slave,
140 addr1 = SDW_DPN_PORTCTRL(t_params->port_num);
141 addr2 = SDW_DPN_BLOCKCTRL1(t_params->port_num);
143 if (bus->params.next_bank) {
144 addr3 = SDW_DPN_SAMPLECTRL1_B1(t_params->port_num);
145 addr4 = SDW_DPN_OFFSETCTRL1_B1(t_params->port_num);
146 addr5 = SDW_DPN_BLOCKCTRL2_B1(t_params->port_num);
147 addr6 = SDW_DPN_LANECTRL_B1(t_params->port_num);
150 addr3 = SDW_DPN_SAMPLECTRL1_B0(t_params->port_num);
151 addr4 = SDW_DPN_OFFSETCTRL1_B0(t_params->port_num);
152 addr5 = SDW_DPN_BLOCKCTRL2_B0(t_params->port_num);
153 addr6 = SDW_DPN_LANECTRL_B0(t_params->port_num);
156 /* Program DPN_PortCtrl register */
157 wbuf = p_params->data_mode << SDW_REG_SHIFT(SDW_DPN_PORTCTRL_DATAMODE);
158 wbuf |= p_params->flow_mode;
160 ret = sdw_update(s_rt->slave, addr1, 0xF, wbuf);
162 dev_err(&s_rt->slave->dev,
163 "DPN_PortCtrl register write failed for port %d\n",
168 /* Program DPN_BlockCtrl1 register */
169 ret = sdw_write(s_rt->slave, addr2, (p_params->bps - 1));
171 dev_err(&s_rt->slave->dev,
172 "DPN_BlockCtrl1 register write failed for port %d\n",
177 /* Program DPN_SampleCtrl1 register */
178 wbuf = (t_params->sample_interval - 1) & SDW_DPN_SAMPLECTRL_LOW;
179 ret = sdw_write(s_rt->slave, addr3, wbuf);
181 dev_err(&s_rt->slave->dev,
182 "DPN_SampleCtrl1 register write failed for port %d\n",
187 /* Program DPN_OffsetCtrl1 registers */
188 ret = sdw_write(s_rt->slave, addr4, t_params->offset1);
190 dev_err(&s_rt->slave->dev,
191 "DPN_OffsetCtrl1 register write failed for port %d\n",
196 /* Program DPN_BlockCtrl2 register*/
197 if (t_params->blk_grp_ctrl_valid) {
198 ret = sdw_write(s_rt->slave, addr5, t_params->blk_grp_ctrl);
200 dev_err(&s_rt->slave->dev,
201 "DPN_BlockCtrl2 reg write failed for port %d\n",
207 /* program DPN_LaneCtrl register */
208 if (slave_prop->lane_control_support) {
209 ret = sdw_write(s_rt->slave, addr6, t_params->lane_ctrl);
211 dev_err(&s_rt->slave->dev,
212 "DPN_LaneCtrl register write failed for port %d\n",
218 if (dpn_prop->type != SDW_DPN_SIMPLE) {
219 ret = _sdw_program_slave_port_params(bus, s_rt->slave,
220 t_params, dpn_prop->type);
222 dev_err(&s_rt->slave->dev,
223 "Transport reg write failed for port: %d\n",
230 static int sdw_program_master_port_params(struct sdw_bus *bus,
231 struct sdw_port_runtime *p_rt)
236 * we need to set transport and port parameters for the port.
237 * Transport parameters refers to the sample interval, offsets and
238 * hstart/stop etc of the data. Port parameters refers to word
239 * length, flow mode etc of the port
241 ret = bus->port_ops->dpn_set_port_transport_params(bus,
242 &p_rt->transport_params,
243 bus->params.next_bank);
247 return bus->port_ops->dpn_set_port_params(bus,
249 bus->params.next_bank);
253 * sdw_program_port_params() - Programs transport parameters of Master(s)
256 * @m_rt: Master stream runtime
258 static int sdw_program_port_params(struct sdw_master_runtime *m_rt)
260 struct sdw_slave_runtime *s_rt = NULL;
261 struct sdw_bus *bus = m_rt->bus;
262 struct sdw_port_runtime *p_rt;
265 /* Program transport & port parameters for Slave(s) */
266 list_for_each_entry(s_rt, &m_rt->slave_rt_list, m_rt_node) {
267 list_for_each_entry(p_rt, &s_rt->port_list, port_node) {
268 ret = sdw_program_slave_port_params(bus, s_rt, p_rt);
274 /* Program transport & port parameters for Master(s) */
275 list_for_each_entry(p_rt, &m_rt->port_list, port_node) {
276 ret = sdw_program_master_port_params(bus, p_rt);
285 * sdw_enable_disable_slave_ports: Enable/disable slave data port
288 * @s_rt: slave runtime
289 * @p_rt: port runtime
290 * @en: enable or disable operation
292 * This function only sets the enable/disable bits in the relevant bank, the
293 * actual enable/disable is done with a bank switch
295 static int sdw_enable_disable_slave_ports(struct sdw_bus *bus,
296 struct sdw_slave_runtime *s_rt,
297 struct sdw_port_runtime *p_rt,
300 struct sdw_transport_params *t_params = &p_rt->transport_params;
304 if (bus->params.next_bank)
305 addr = SDW_DPN_CHANNELEN_B1(p_rt->num);
307 addr = SDW_DPN_CHANNELEN_B0(p_rt->num);
310 * Since bus doesn't support sharing a port across two streams,
311 * it is safe to reset this register
314 ret = sdw_update(s_rt->slave, addr, 0xFF, p_rt->ch_mask);
316 ret = sdw_update(s_rt->slave, addr, 0xFF, 0x0);
319 dev_err(&s_rt->slave->dev,
320 "Slave chn_en reg write failed:%d port:%d\n",
321 ret, t_params->port_num);
326 static int sdw_enable_disable_master_ports(struct sdw_master_runtime *m_rt,
327 struct sdw_port_runtime *p_rt,
330 struct sdw_transport_params *t_params = &p_rt->transport_params;
331 struct sdw_bus *bus = m_rt->bus;
332 struct sdw_enable_ch enable_ch;
335 enable_ch.port_num = p_rt->num;
336 enable_ch.ch_mask = p_rt->ch_mask;
337 enable_ch.enable = en;
339 /* Perform Master port channel(s) enable/disable */
340 if (bus->port_ops->dpn_port_enable_ch) {
341 ret = bus->port_ops->dpn_port_enable_ch(bus,
343 bus->params.next_bank);
346 "Master chn_en write failed:%d port:%d\n",
347 ret, t_params->port_num);
352 "dpn_port_enable_ch not supported, %s failed\n",
353 en ? "enable" : "disable");
361 * sdw_enable_disable_ports() - Enable/disable port(s) for Master and
364 * @m_rt: Master stream runtime
365 * @en: mode (enable/disable)
367 static int sdw_enable_disable_ports(struct sdw_master_runtime *m_rt, bool en)
369 struct sdw_port_runtime *s_port, *m_port;
370 struct sdw_slave_runtime *s_rt = NULL;
373 /* Enable/Disable Slave port(s) */
374 list_for_each_entry(s_rt, &m_rt->slave_rt_list, m_rt_node) {
375 list_for_each_entry(s_port, &s_rt->port_list, port_node) {
376 ret = sdw_enable_disable_slave_ports(m_rt->bus, s_rt,
383 /* Enable/Disable Master port(s) */
384 list_for_each_entry(m_port, &m_rt->port_list, port_node) {
385 ret = sdw_enable_disable_master_ports(m_rt, m_port, en);
393 static int sdw_do_port_prep(struct sdw_slave_runtime *s_rt,
394 struct sdw_prepare_ch prep_ch,
395 enum sdw_port_prep_ops cmd)
397 const struct sdw_slave_ops *ops = s_rt->slave->ops;
400 if (ops->port_prep) {
401 ret = ops->port_prep(s_rt->slave, &prep_ch, cmd);
403 dev_err(&s_rt->slave->dev,
404 "Slave Port Prep cmd %d failed: %d\n",
413 static int sdw_prep_deprep_slave_ports(struct sdw_bus *bus,
414 struct sdw_slave_runtime *s_rt,
415 struct sdw_port_runtime *p_rt,
418 struct completion *port_ready = NULL;
419 struct sdw_dpn_prop *dpn_prop;
420 struct sdw_prepare_ch prep_ch;
421 unsigned int time_left;
426 prep_ch.num = p_rt->num;
427 prep_ch.ch_mask = p_rt->ch_mask;
429 dpn_prop = sdw_get_slave_dpn_prop(s_rt->slave,
434 "Slave Port:%d properties not found\n", prep_ch.num);
438 prep_ch.prepare = prep;
440 prep_ch.bank = bus->params.next_bank;
442 if (dpn_prop->imp_def_interrupts || !dpn_prop->simple_ch_prep_sm)
446 * Enable interrupt before Port prepare.
447 * For Port de-prepare, it is assumed that port
448 * was prepared earlier
451 ret = sdw_configure_dpn_intr(s_rt->slave, p_rt->num, prep,
452 dpn_prop->imp_def_interrupts);
457 /* Inform slave about the impending port prepare */
458 sdw_do_port_prep(s_rt, prep_ch, SDW_OPS_PORT_PRE_PREP);
460 /* Prepare Slave port implementing CP_SM */
461 if (!dpn_prop->simple_ch_prep_sm) {
462 addr = SDW_DPN_PREPARECTRL(p_rt->num);
465 ret = sdw_update(s_rt->slave, addr,
466 0xFF, p_rt->ch_mask);
468 ret = sdw_update(s_rt->slave, addr, 0xFF, 0x0);
471 dev_err(&s_rt->slave->dev,
472 "Slave prep_ctrl reg write failed\n");
476 /* Wait for completion on port ready */
477 port_ready = &s_rt->slave->port_ready[prep_ch.num];
478 time_left = wait_for_completion_timeout(port_ready,
479 msecs_to_jiffies(dpn_prop->ch_prep_timeout));
481 val = sdw_read(s_rt->slave, SDW_DPN_PREPARESTATUS(p_rt->num));
482 val &= p_rt->ch_mask;
483 if (!time_left || val) {
484 dev_err(&s_rt->slave->dev,
485 "Chn prep failed for port:%d\n", prep_ch.num);
490 /* Inform slaves about ports prepared */
491 sdw_do_port_prep(s_rt, prep_ch, SDW_OPS_PORT_POST_PREP);
493 /* Disable interrupt after Port de-prepare */
495 ret = sdw_configure_dpn_intr(s_rt->slave, p_rt->num, prep,
496 dpn_prop->imp_def_interrupts);
501 static int sdw_prep_deprep_master_ports(struct sdw_master_runtime *m_rt,
502 struct sdw_port_runtime *p_rt,
505 struct sdw_transport_params *t_params = &p_rt->transport_params;
506 struct sdw_bus *bus = m_rt->bus;
507 const struct sdw_master_port_ops *ops = bus->port_ops;
508 struct sdw_prepare_ch prep_ch;
511 prep_ch.num = p_rt->num;
512 prep_ch.ch_mask = p_rt->ch_mask;
513 prep_ch.prepare = prep; /* Prepare/De-prepare */
514 prep_ch.bank = bus->params.next_bank;
516 /* Pre-prepare/Pre-deprepare port(s) */
517 if (ops->dpn_port_prep) {
518 ret = ops->dpn_port_prep(bus, &prep_ch);
520 dev_err(bus->dev, "Port prepare failed for port:%d\n",
530 * sdw_prep_deprep_ports() - Prepare/De-prepare port(s) for Master(s) and
533 * @m_rt: Master runtime handle
534 * @prep: Prepare or De-prepare
536 static int sdw_prep_deprep_ports(struct sdw_master_runtime *m_rt, bool prep)
538 struct sdw_slave_runtime *s_rt = NULL;
539 struct sdw_port_runtime *p_rt;
542 /* Prepare/De-prepare Slave port(s) */
543 list_for_each_entry(s_rt, &m_rt->slave_rt_list, m_rt_node) {
544 list_for_each_entry(p_rt, &s_rt->port_list, port_node) {
545 ret = sdw_prep_deprep_slave_ports(m_rt->bus, s_rt,
552 /* Prepare/De-prepare Master port(s) */
553 list_for_each_entry(p_rt, &m_rt->port_list, port_node) {
554 ret = sdw_prep_deprep_master_ports(m_rt, p_rt, prep);
563 * sdw_notify_config() - Notify bus configuration
565 * @m_rt: Master runtime handle
567 * This function notifies the Master(s) and Slave(s) of the
568 * new bus configuration.
570 static int sdw_notify_config(struct sdw_master_runtime *m_rt)
572 struct sdw_slave_runtime *s_rt;
573 struct sdw_bus *bus = m_rt->bus;
574 struct sdw_slave *slave;
577 if (bus->ops->set_bus_conf) {
578 ret = bus->ops->set_bus_conf(bus, &bus->params);
583 list_for_each_entry(s_rt, &m_rt->slave_rt_list, m_rt_node) {
586 if (slave->ops->bus_config) {
587 ret = slave->ops->bus_config(slave, &bus->params);
589 dev_err(bus->dev, "Notify Slave: %d failed\n",
599 * sdw_program_params() - Program transport and port parameters for Master(s)
602 * @bus: SDW bus instance
604 static int sdw_program_params(struct sdw_bus *bus)
606 struct sdw_master_runtime *m_rt = NULL;
609 list_for_each_entry(m_rt, &bus->m_rt_list, bus_node) {
610 ret = sdw_program_port_params(m_rt);
613 "Program transport params failed: %d\n", ret);
617 ret = sdw_notify_config(m_rt);
620 "Notify bus config failed: %d\n", ret);
624 /* Enable port(s) on alternate bank for all active streams */
625 if (m_rt->stream->state != SDW_STREAM_ENABLED)
628 ret = sdw_enable_disable_ports(m_rt, true);
630 dev_err(bus->dev, "Enable channel failed: %d\n", ret);
638 static int sdw_bank_switch(struct sdw_bus *bus, int m_rt_count)
640 int col_index, row_index;
642 struct sdw_msg *wr_msg;
647 wr_msg = kzalloc(sizeof(*wr_msg), GFP_KERNEL);
651 bus->defer_msg.msg = wr_msg;
653 wbuf = kzalloc(sizeof(*wbuf), GFP_KERNEL);
659 /* Get row and column index to program register */
660 col_index = sdw_find_col_index(bus->params.col);
661 row_index = sdw_find_row_index(bus->params.row);
662 wbuf[0] = col_index | (row_index << 3);
664 if (bus->params.next_bank)
665 addr = SDW_SCP_FRAMECTRL_B1;
667 addr = SDW_SCP_FRAMECTRL_B0;
669 sdw_fill_msg(wr_msg, NULL, addr, 1, SDW_BROADCAST_DEV_NUM,
670 SDW_MSG_FLAG_WRITE, wbuf);
671 wr_msg->ssp_sync = true;
674 * Set the multi_link flag only when both the hardware supports
675 * and there is a stream handled by multiple masters
677 multi_link = bus->multi_link && (m_rt_count > 1);
680 ret = sdw_transfer_defer(bus, wr_msg, &bus->defer_msg);
682 ret = sdw_transfer(bus, wr_msg);
685 dev_err(bus->dev, "Slave frame_ctrl reg write failed\n");
692 bus->defer_msg.msg = NULL;
693 bus->params.curr_bank = !bus->params.curr_bank;
694 bus->params.next_bank = !bus->params.next_bank;
707 * sdw_ml_sync_bank_switch: Multilink register bank switch
709 * @bus: SDW bus instance
711 * Caller function should free the buffers on error
713 static int sdw_ml_sync_bank_switch(struct sdw_bus *bus)
715 unsigned long time_left;
717 if (!bus->multi_link)
720 /* Wait for completion of transfer */
721 time_left = wait_for_completion_timeout(&bus->defer_msg.complete,
722 bus->bank_switch_timeout);
725 dev_err(bus->dev, "Controller Timed out on bank switch\n");
729 bus->params.curr_bank = !bus->params.curr_bank;
730 bus->params.next_bank = !bus->params.next_bank;
732 if (bus->defer_msg.msg) {
733 kfree(bus->defer_msg.msg->buf);
734 kfree(bus->defer_msg.msg);
740 static int do_bank_switch(struct sdw_stream_runtime *stream)
742 struct sdw_master_runtime *m_rt = NULL;
743 const struct sdw_master_ops *ops;
744 struct sdw_bus *bus = NULL;
745 bool multi_link = false;
748 list_for_each_entry(m_rt, &stream->master_list, stream_node) {
752 if (bus->multi_link) {
754 mutex_lock(&bus->msg_lock);
757 /* Pre-bank switch */
758 if (ops->pre_bank_switch) {
759 ret = ops->pre_bank_switch(bus);
762 "Pre bank switch op failed: %d\n", ret);
768 * Perform Bank switch operation.
769 * For multi link cases, the actual bank switch is
770 * synchronized across all Masters and happens later as a
771 * part of post_bank_switch ops.
773 ret = sdw_bank_switch(bus, stream->m_rt_count);
775 dev_err(bus->dev, "Bank switch failed: %d\n", ret);
781 * For multi link cases, it is expected that the bank switch is
782 * triggered by the post_bank_switch for the first Master in the list
783 * and for the other Masters the post_bank_switch() should return doing
786 list_for_each_entry(m_rt, &stream->master_list, stream_node) {
790 /* Post-bank switch */
791 if (ops->post_bank_switch) {
792 ret = ops->post_bank_switch(bus);
795 "Post bank switch op failed: %d\n",
799 } else if (bus->multi_link && stream->m_rt_count > 1) {
801 "Post bank switch ops not implemented\n");
805 /* Set the bank switch timeout to default, if not set */
806 if (!bus->bank_switch_timeout)
807 bus->bank_switch_timeout = DEFAULT_BANK_SWITCH_TIMEOUT;
809 /* Check if bank switch was successful */
810 ret = sdw_ml_sync_bank_switch(bus);
813 "multi link bank switch failed: %d\n", ret);
818 mutex_unlock(&bus->msg_lock);
824 list_for_each_entry(m_rt, &stream->master_list, stream_node) {
827 kfree(bus->defer_msg.msg->buf);
828 kfree(bus->defer_msg.msg);
834 list_for_each_entry(m_rt, &stream->master_list, stream_node) {
836 if (mutex_is_locked(&bus->msg_lock))
837 mutex_unlock(&bus->msg_lock);
845 * sdw_release_stream() - Free the assigned stream runtime
847 * @stream: SoundWire stream runtime
849 * sdw_release_stream should be called only once per stream
851 void sdw_release_stream(struct sdw_stream_runtime *stream)
855 EXPORT_SYMBOL(sdw_release_stream);
858 * sdw_alloc_stream() - Allocate and return stream runtime
860 * @stream_name: SoundWire stream name
862 * Allocates a SoundWire stream runtime instance.
863 * sdw_alloc_stream should be called only once per stream. Typically
864 * invoked from ALSA/ASoC machine/platform driver.
866 struct sdw_stream_runtime *sdw_alloc_stream(char *stream_name)
868 struct sdw_stream_runtime *stream;
870 stream = kzalloc(sizeof(*stream), GFP_KERNEL);
874 stream->name = stream_name;
875 INIT_LIST_HEAD(&stream->master_list);
876 stream->state = SDW_STREAM_ALLOCATED;
877 stream->m_rt_count = 0;
881 EXPORT_SYMBOL(sdw_alloc_stream);
883 static struct sdw_master_runtime
884 *sdw_find_master_rt(struct sdw_bus *bus,
885 struct sdw_stream_runtime *stream)
887 struct sdw_master_runtime *m_rt = NULL;
889 /* Retrieve Bus handle if already available */
890 list_for_each_entry(m_rt, &stream->master_list, stream_node) {
891 if (m_rt->bus == bus)
899 * sdw_alloc_master_rt() - Allocates and initialize Master runtime handle
901 * @bus: SDW bus instance
902 * @stream_config: Stream configuration
903 * @stream: Stream runtime handle.
905 * This function is to be called with bus_lock held.
907 static struct sdw_master_runtime
908 *sdw_alloc_master_rt(struct sdw_bus *bus,
909 struct sdw_stream_config *stream_config,
910 struct sdw_stream_runtime *stream)
912 struct sdw_master_runtime *m_rt;
915 * check if Master is already allocated (as a result of Slave adding
916 * it first), if so skip allocation and go to configure
918 m_rt = sdw_find_master_rt(bus, stream);
922 m_rt = kzalloc(sizeof(*m_rt), GFP_KERNEL);
926 /* Initialization of Master runtime handle */
927 INIT_LIST_HEAD(&m_rt->port_list);
928 INIT_LIST_HEAD(&m_rt->slave_rt_list);
929 list_add_tail(&m_rt->stream_node, &stream->master_list);
931 list_add_tail(&m_rt->bus_node, &bus->m_rt_list);
934 m_rt->ch_count = stream_config->ch_count;
936 m_rt->stream = stream;
937 m_rt->direction = stream_config->direction;
943 * sdw_alloc_slave_rt() - Allocate and initialize Slave runtime handle.
945 * @slave: Slave handle
946 * @stream_config: Stream configuration
947 * @stream: Stream runtime handle
949 * This function is to be called with bus_lock held.
951 static struct sdw_slave_runtime
952 *sdw_alloc_slave_rt(struct sdw_slave *slave,
953 struct sdw_stream_config *stream_config,
954 struct sdw_stream_runtime *stream)
956 struct sdw_slave_runtime *s_rt = NULL;
958 s_rt = kzalloc(sizeof(*s_rt), GFP_KERNEL);
962 INIT_LIST_HEAD(&s_rt->port_list);
963 s_rt->ch_count = stream_config->ch_count;
964 s_rt->direction = stream_config->direction;
970 static void sdw_master_port_release(struct sdw_bus *bus,
971 struct sdw_master_runtime *m_rt)
973 struct sdw_port_runtime *p_rt, *_p_rt;
975 list_for_each_entry_safe(p_rt, _p_rt, &m_rt->port_list, port_node) {
976 list_del(&p_rt->port_node);
981 static void sdw_slave_port_release(struct sdw_bus *bus,
982 struct sdw_slave *slave,
983 struct sdw_stream_runtime *stream)
985 struct sdw_port_runtime *p_rt, *_p_rt;
986 struct sdw_master_runtime *m_rt;
987 struct sdw_slave_runtime *s_rt;
989 list_for_each_entry(m_rt, &stream->master_list, stream_node) {
990 list_for_each_entry(s_rt, &m_rt->slave_rt_list, m_rt_node) {
991 if (s_rt->slave != slave)
994 list_for_each_entry_safe(p_rt, _p_rt,
995 &s_rt->port_list, port_node) {
996 list_del(&p_rt->port_node);
1004 * sdw_release_slave_stream() - Free Slave(s) runtime handle
1006 * @slave: Slave handle.
1007 * @stream: Stream runtime handle.
1009 * This function is to be called with bus_lock held.
1011 static void sdw_release_slave_stream(struct sdw_slave *slave,
1012 struct sdw_stream_runtime *stream)
1014 struct sdw_slave_runtime *s_rt, *_s_rt;
1015 struct sdw_master_runtime *m_rt;
1017 list_for_each_entry(m_rt, &stream->master_list, stream_node) {
1018 /* Retrieve Slave runtime handle */
1019 list_for_each_entry_safe(s_rt, _s_rt,
1020 &m_rt->slave_rt_list, m_rt_node) {
1021 if (s_rt->slave == slave) {
1022 list_del(&s_rt->m_rt_node);
1031 * sdw_release_master_stream() - Free Master runtime handle
1033 * @m_rt: Master runtime node
1034 * @stream: Stream runtime handle.
1036 * This function is to be called with bus_lock held
1037 * It frees the Master runtime handle and associated Slave(s) runtime
1038 * handle. If this is called first then sdw_release_slave_stream() will have
1039 * no effect as Slave(s) runtime handle would already be freed up.
1041 static void sdw_release_master_stream(struct sdw_master_runtime *m_rt,
1042 struct sdw_stream_runtime *stream)
1044 struct sdw_slave_runtime *s_rt, *_s_rt;
1046 list_for_each_entry_safe(s_rt, _s_rt, &m_rt->slave_rt_list, m_rt_node) {
1047 sdw_slave_port_release(s_rt->slave->bus, s_rt->slave, stream);
1048 sdw_release_slave_stream(s_rt->slave, stream);
1051 list_del(&m_rt->stream_node);
1052 list_del(&m_rt->bus_node);
1057 * sdw_stream_remove_master() - Remove master from sdw_stream
1059 * @bus: SDW Bus instance
1060 * @stream: SoundWire stream
1062 * This removes and frees port_rt and master_rt from a stream
1064 int sdw_stream_remove_master(struct sdw_bus *bus,
1065 struct sdw_stream_runtime *stream)
1067 struct sdw_master_runtime *m_rt, *_m_rt;
1069 mutex_lock(&bus->bus_lock);
1071 list_for_each_entry_safe(m_rt, _m_rt,
1072 &stream->master_list, stream_node) {
1073 if (m_rt->bus != bus)
1076 sdw_master_port_release(bus, m_rt);
1077 sdw_release_master_stream(m_rt, stream);
1078 stream->m_rt_count--;
1081 if (list_empty(&stream->master_list))
1082 stream->state = SDW_STREAM_RELEASED;
1084 mutex_unlock(&bus->bus_lock);
1088 EXPORT_SYMBOL(sdw_stream_remove_master);
1091 * sdw_stream_remove_slave() - Remove slave from sdw_stream
1093 * @slave: SDW Slave instance
1094 * @stream: SoundWire stream
1096 * This removes and frees port_rt and slave_rt from a stream
1098 int sdw_stream_remove_slave(struct sdw_slave *slave,
1099 struct sdw_stream_runtime *stream)
1101 mutex_lock(&slave->bus->bus_lock);
1103 sdw_slave_port_release(slave->bus, slave, stream);
1104 sdw_release_slave_stream(slave, stream);
1106 mutex_unlock(&slave->bus->bus_lock);
1110 EXPORT_SYMBOL(sdw_stream_remove_slave);
1113 * sdw_config_stream() - Configure the allocated stream
1116 * @stream: SoundWire stream
1117 * @stream_config: Stream configuration for audio stream
1118 * @is_slave: is API called from Slave or Master
1120 * This function is to be called with bus_lock held.
1122 static int sdw_config_stream(struct device *dev,
1123 struct sdw_stream_runtime *stream,
1124 struct sdw_stream_config *stream_config,
1128 * Update the stream rate, channel and bps based on data
1129 * source. For more than one data source (multilink),
1130 * match the rate, bps, stream type and increment number of channels.
1132 * If rate/bps is zero, it means the values are not set, so skip
1133 * comparison and allow the value to be set and stored in stream
1135 if (stream->params.rate &&
1136 stream->params.rate != stream_config->frame_rate) {
1137 dev_err(dev, "rate not matching, stream:%s\n", stream->name);
1141 if (stream->params.bps &&
1142 stream->params.bps != stream_config->bps) {
1143 dev_err(dev, "bps not matching, stream:%s\n", stream->name);
1147 stream->type = stream_config->type;
1148 stream->params.rate = stream_config->frame_rate;
1149 stream->params.bps = stream_config->bps;
1151 /* TODO: Update this check during Device-device support */
1153 stream->params.ch_count += stream_config->ch_count;
1158 static int sdw_is_valid_port_range(struct device *dev,
1159 struct sdw_port_runtime *p_rt)
1161 if (!SDW_VALID_PORT_RANGE(p_rt->num)) {
1163 "SoundWire: Invalid port number :%d\n", p_rt->num);
1170 static struct sdw_port_runtime
1171 *sdw_port_alloc(struct device *dev,
1172 struct sdw_port_config *port_config,
1175 struct sdw_port_runtime *p_rt;
1177 p_rt = kzalloc(sizeof(*p_rt), GFP_KERNEL);
1181 p_rt->ch_mask = port_config[port_index].ch_mask;
1182 p_rt->num = port_config[port_index].num;
1187 static int sdw_master_port_config(struct sdw_bus *bus,
1188 struct sdw_master_runtime *m_rt,
1189 struct sdw_port_config *port_config,
1190 unsigned int num_ports)
1192 struct sdw_port_runtime *p_rt;
1195 /* Iterate for number of ports to perform initialization */
1196 for (i = 0; i < num_ports; i++) {
1197 p_rt = sdw_port_alloc(bus->dev, port_config, i);
1202 * TODO: Check port capabilities for requested
1203 * configuration (audio mode support)
1206 list_add_tail(&p_rt->port_node, &m_rt->port_list);
1212 static int sdw_slave_port_config(struct sdw_slave *slave,
1213 struct sdw_slave_runtime *s_rt,
1214 struct sdw_port_config *port_config,
1215 unsigned int num_config)
1217 struct sdw_port_runtime *p_rt;
1220 /* Iterate for number of ports to perform initialization */
1221 for (i = 0; i < num_config; i++) {
1222 p_rt = sdw_port_alloc(&slave->dev, port_config, i);
1227 * TODO: Check valid port range as defined by DisCo/
1230 ret = sdw_is_valid_port_range(&slave->dev, p_rt);
1237 * TODO: Check port capabilities for requested
1238 * configuration (audio mode support)
1241 list_add_tail(&p_rt->port_node, &s_rt->port_list);
1248 * sdw_stream_add_master() - Allocate and add master runtime to a stream
1250 * @bus: SDW Bus instance
1251 * @stream_config: Stream configuration for audio stream
1252 * @port_config: Port configuration for audio stream
1253 * @num_ports: Number of ports
1254 * @stream: SoundWire stream
1256 int sdw_stream_add_master(struct sdw_bus *bus,
1257 struct sdw_stream_config *stream_config,
1258 struct sdw_port_config *port_config,
1259 unsigned int num_ports,
1260 struct sdw_stream_runtime *stream)
1262 struct sdw_master_runtime *m_rt = NULL;
1265 mutex_lock(&bus->bus_lock);
1268 * For multi link streams, add the second master only if
1269 * the bus supports it.
1270 * Check if bus->multi_link is set
1272 if (!bus->multi_link && stream->m_rt_count > 0) {
1274 "Multilink not supported, link %d\n", bus->link_id);
1279 m_rt = sdw_alloc_master_rt(bus, stream_config, stream);
1282 "Master runtime config failed for stream:%s\n",
1288 ret = sdw_config_stream(bus->dev, stream, stream_config, false);
1292 ret = sdw_master_port_config(bus, m_rt, port_config, num_ports);
1296 stream->m_rt_count++;
1301 sdw_release_master_stream(m_rt, stream);
1303 mutex_unlock(&bus->bus_lock);
1306 EXPORT_SYMBOL(sdw_stream_add_master);
1309 * sdw_stream_add_slave() - Allocate and add master/slave runtime to a stream
1311 * @slave: SDW Slave instance
1312 * @stream_config: Stream configuration for audio stream
1313 * @stream: SoundWire stream
1314 * @port_config: Port configuration for audio stream
1315 * @num_ports: Number of ports
1317 * It is expected that Slave is added before adding Master
1321 int sdw_stream_add_slave(struct sdw_slave *slave,
1322 struct sdw_stream_config *stream_config,
1323 struct sdw_port_config *port_config,
1324 unsigned int num_ports,
1325 struct sdw_stream_runtime *stream)
1327 struct sdw_slave_runtime *s_rt;
1328 struct sdw_master_runtime *m_rt;
1331 mutex_lock(&slave->bus->bus_lock);
1334 * If this API is invoked by Slave first then m_rt is not valid.
1335 * So, allocate m_rt and add Slave to it.
1337 m_rt = sdw_alloc_master_rt(slave->bus, stream_config, stream);
1339 dev_err(&slave->dev,
1340 "alloc master runtime failed for stream:%s\n",
1346 s_rt = sdw_alloc_slave_rt(slave, stream_config, stream);
1348 dev_err(&slave->dev,
1349 "Slave runtime config failed for stream:%s\n",
1355 ret = sdw_config_stream(&slave->dev, stream, stream_config, true);
1359 list_add_tail(&s_rt->m_rt_node, &m_rt->slave_rt_list);
1361 ret = sdw_slave_port_config(slave, s_rt, port_config, num_ports);
1366 * Change stream state to CONFIGURED on first Slave add.
1367 * Bus is not aware of number of Slave(s) in a stream at this
1368 * point so cannot depend on all Slave(s) to be added in order to
1369 * change stream state to CONFIGURED.
1371 stream->state = SDW_STREAM_CONFIGURED;
1376 * we hit error so cleanup the stream, release all Slave(s) and
1379 sdw_release_master_stream(m_rt, stream);
1381 mutex_unlock(&slave->bus->bus_lock);
1384 EXPORT_SYMBOL(sdw_stream_add_slave);
1387 * sdw_get_slave_dpn_prop() - Get Slave port capabilities
1389 * @slave: Slave handle
1390 * @direction: Data direction.
1391 * @port_num: Port number
1393 struct sdw_dpn_prop *sdw_get_slave_dpn_prop(struct sdw_slave *slave,
1394 enum sdw_data_direction direction,
1395 unsigned int port_num)
1397 struct sdw_dpn_prop *dpn_prop;
1401 if (direction == SDW_DATA_DIR_TX) {
1402 num_ports = hweight32(slave->prop.source_ports);
1403 dpn_prop = slave->prop.src_dpn_prop;
1405 num_ports = hweight32(slave->prop.sink_ports);
1406 dpn_prop = slave->prop.sink_dpn_prop;
1409 for (i = 0; i < num_ports; i++) {
1410 if (dpn_prop[i].num == port_num)
1411 return &dpn_prop[i];
1418 * sdw_acquire_bus_lock: Acquire bus lock for all Master runtime(s)
1420 * @stream: SoundWire stream
1422 * Acquire bus_lock for each of the master runtime(m_rt) part of this
1423 * stream to reconfigure the bus.
1424 * NOTE: This function is called from SoundWire stream ops and is
1425 * expected that a global lock is held before acquiring bus_lock.
1427 static void sdw_acquire_bus_lock(struct sdw_stream_runtime *stream)
1429 struct sdw_master_runtime *m_rt = NULL;
1430 struct sdw_bus *bus = NULL;
1432 /* Iterate for all Master(s) in Master list */
1433 list_for_each_entry(m_rt, &stream->master_list, stream_node) {
1436 mutex_lock(&bus->bus_lock);
1441 * sdw_release_bus_lock: Release bus lock for all Master runtime(s)
1443 * @stream: SoundWire stream
1445 * Release the previously held bus_lock after reconfiguring the bus.
1446 * NOTE: This function is called from SoundWire stream ops and is
1447 * expected that a global lock is held before releasing bus_lock.
1449 static void sdw_release_bus_lock(struct sdw_stream_runtime *stream)
1451 struct sdw_master_runtime *m_rt = NULL;
1452 struct sdw_bus *bus = NULL;
1454 /* Iterate for all Master(s) in Master list */
1455 list_for_each_entry_reverse(m_rt, &stream->master_list, stream_node) {
1457 mutex_unlock(&bus->bus_lock);
1461 static int _sdw_prepare_stream(struct sdw_stream_runtime *stream)
1463 struct sdw_master_runtime *m_rt = NULL;
1464 struct sdw_bus *bus = NULL;
1465 struct sdw_master_prop *prop = NULL;
1466 struct sdw_bus_params params;
1469 /* Prepare Master(s) and Slave(s) port(s) associated with stream */
1470 list_for_each_entry(m_rt, &stream->master_list, stream_node) {
1473 memcpy(¶ms, &bus->params, sizeof(params));
1475 /* TODO: Support Asynchronous mode */
1476 if ((prop->max_clk_freq % stream->params.rate) != 0) {
1477 dev_err(bus->dev, "Async mode not supported\n");
1481 /* Increment cumulative bus bandwidth */
1482 /* TODO: Update this during Device-Device support */
1483 bus->params.bandwidth += m_rt->stream->params.rate *
1484 m_rt->ch_count * m_rt->stream->params.bps;
1486 /* Program params */
1487 ret = sdw_program_params(bus);
1489 dev_err(bus->dev, "Program params failed: %d\n", ret);
1490 goto restore_params;
1494 ret = do_bank_switch(stream);
1496 dev_err(bus->dev, "Bank switch failed: %d\n", ret);
1497 goto restore_params;
1500 list_for_each_entry(m_rt, &stream->master_list, stream_node) {
1503 /* Prepare port(s) on the new clock configuration */
1504 ret = sdw_prep_deprep_ports(m_rt, true);
1506 dev_err(bus->dev, "Prepare port(s) failed ret = %d\n",
1512 stream->state = SDW_STREAM_PREPARED;
1517 memcpy(&bus->params, ¶ms, sizeof(params));
1522 * sdw_prepare_stream() - Prepare SoundWire stream
1524 * @stream: Soundwire stream
1526 * Documentation/driver-api/soundwire/stream.rst explains this API in detail
1528 int sdw_prepare_stream(struct sdw_stream_runtime *stream)
1533 pr_err("SoundWire: Handle not found for stream\n");
1537 sdw_acquire_bus_lock(stream);
1539 ret = _sdw_prepare_stream(stream);
1541 pr_err("Prepare for stream:%s failed: %d\n", stream->name, ret);
1543 sdw_release_bus_lock(stream);
1546 EXPORT_SYMBOL(sdw_prepare_stream);
1548 static int _sdw_enable_stream(struct sdw_stream_runtime *stream)
1550 struct sdw_master_runtime *m_rt = NULL;
1551 struct sdw_bus *bus = NULL;
1554 /* Enable Master(s) and Slave(s) port(s) associated with stream */
1555 list_for_each_entry(m_rt, &stream->master_list, stream_node) {
1558 /* Program params */
1559 ret = sdw_program_params(bus);
1561 dev_err(bus->dev, "Program params failed: %d\n", ret);
1565 /* Enable port(s) */
1566 ret = sdw_enable_disable_ports(m_rt, true);
1569 "Enable port(s) failed ret: %d\n", ret);
1574 ret = do_bank_switch(stream);
1576 dev_err(bus->dev, "Bank switch failed: %d\n", ret);
1580 stream->state = SDW_STREAM_ENABLED;
1585 * sdw_enable_stream() - Enable SoundWire stream
1587 * @stream: Soundwire stream
1589 * Documentation/driver-api/soundwire/stream.rst explains this API in detail
1591 int sdw_enable_stream(struct sdw_stream_runtime *stream)
1596 pr_err("SoundWire: Handle not found for stream\n");
1600 sdw_acquire_bus_lock(stream);
1602 ret = _sdw_enable_stream(stream);
1604 pr_err("Enable for stream:%s failed: %d\n", stream->name, ret);
1606 sdw_release_bus_lock(stream);
1609 EXPORT_SYMBOL(sdw_enable_stream);
1611 static int _sdw_disable_stream(struct sdw_stream_runtime *stream)
1613 struct sdw_master_runtime *m_rt = NULL;
1614 struct sdw_bus *bus = NULL;
1617 list_for_each_entry(m_rt, &stream->master_list, stream_node) {
1619 /* Disable port(s) */
1620 ret = sdw_enable_disable_ports(m_rt, false);
1622 dev_err(bus->dev, "Disable port(s) failed: %d\n", ret);
1626 stream->state = SDW_STREAM_DISABLED;
1628 list_for_each_entry(m_rt, &stream->master_list, stream_node) {
1630 /* Program params */
1631 ret = sdw_program_params(bus);
1633 dev_err(bus->dev, "Program params failed: %d\n", ret);
1638 return do_bank_switch(stream);
1642 * sdw_disable_stream() - Disable SoundWire stream
1644 * @stream: Soundwire stream
1646 * Documentation/driver-api/soundwire/stream.rst explains this API in detail
1648 int sdw_disable_stream(struct sdw_stream_runtime *stream)
1653 pr_err("SoundWire: Handle not found for stream\n");
1657 sdw_acquire_bus_lock(stream);
1659 ret = _sdw_disable_stream(stream);
1661 pr_err("Disable for stream:%s failed: %d\n", stream->name, ret);
1663 sdw_release_bus_lock(stream);
1666 EXPORT_SYMBOL(sdw_disable_stream);
1668 static int _sdw_deprepare_stream(struct sdw_stream_runtime *stream)
1670 struct sdw_master_runtime *m_rt = NULL;
1671 struct sdw_bus *bus = NULL;
1674 list_for_each_entry(m_rt, &stream->master_list, stream_node) {
1676 /* De-prepare port(s) */
1677 ret = sdw_prep_deprep_ports(m_rt, false);
1680 "De-prepare port(s) failed: %d\n", ret);
1684 /* TODO: Update this during Device-Device support */
1685 bus->params.bandwidth -= m_rt->stream->params.rate *
1686 m_rt->ch_count * m_rt->stream->params.bps;
1688 /* Program params */
1689 ret = sdw_program_params(bus);
1691 dev_err(bus->dev, "Program params failed: %d\n", ret);
1696 stream->state = SDW_STREAM_DEPREPARED;
1697 return do_bank_switch(stream);
1701 * sdw_deprepare_stream() - Deprepare SoundWire stream
1703 * @stream: Soundwire stream
1705 * Documentation/driver-api/soundwire/stream.rst explains this API in detail
1707 int sdw_deprepare_stream(struct sdw_stream_runtime *stream)
1712 pr_err("SoundWire: Handle not found for stream\n");
1716 sdw_acquire_bus_lock(stream);
1717 ret = _sdw_deprepare_stream(stream);
1719 pr_err("De-prepare for stream:%d failed: %d\n", ret, ret);
1721 sdw_release_bus_lock(stream);
1724 EXPORT_SYMBOL(sdw_deprepare_stream);