1 // SPDX-License-Identifier: GPL-2.0-only
3  * HD-audio core bus driver
24  * snd_hdac_bus_init - initialize a HD-audio bas bus
25  * @bus: the pointer to bus object
27  * @ops: bus verb operators
31 int snd_hdac_bus_init(struct hdac_bus *bus, struct device *dev,  in snd_hdac_bus_init()  argument
34 	memset(bus, 0, sizeof(*bus));  in snd_hdac_bus_init()
35 	bus->dev = dev;  in snd_hdac_bus_init()
37 		bus->ops = ops;  in snd_hdac_bus_init()
39 		bus->ops = &default_ops;  in snd_hdac_bus_init()
40 	bus->dma_type = SNDRV_DMA_TYPE_DEV;  in snd_hdac_bus_init()
41 	INIT_LIST_HEAD(&bus->stream_list);  in snd_hdac_bus_init()
42 	INIT_LIST_HEAD(&bus->codec_list);  in snd_hdac_bus_init()
43 	INIT_WORK(&bus->unsol_work, snd_hdac_bus_process_unsol_events);  in snd_hdac_bus_init()
44 	spin_lock_init(&bus->reg_lock);  in snd_hdac_bus_init()
45 	mutex_init(&bus->cmd_mutex);  in snd_hdac_bus_init()
46 	mutex_init(&bus->lock);  in snd_hdac_bus_init()
47 	INIT_LIST_HEAD(&bus->hlink_list);  in snd_hdac_bus_init()
48 	init_waitqueue_head(&bus->rirb_wq);  in snd_hdac_bus_init()
49 	bus->irq = -1;  in snd_hdac_bus_init()
60 	bus->sdo_limit = 8;  in snd_hdac_bus_init()
67  * snd_hdac_bus_exit - clean up a HD-audio bas bus
68  * @bus: the pointer to bus object
70 void snd_hdac_bus_exit(struct hdac_bus *bus)  in snd_hdac_bus_exit()  argument
72 	WARN_ON(!list_empty(&bus->stream_list));  in snd_hdac_bus_exit()
73 	WARN_ON(!list_empty(&bus->codec_list));  in snd_hdac_bus_exit()
74 	cancel_work_sync(&bus->unsol_work);  in snd_hdac_bus_exit()
79  * snd_hdac_bus_exec_verb - execute a HD-audio verb on the given bus
80  * @bus: bus object
81  * @addr: the HDAC device address
82  * @cmd: HD-audio encoded verb
87 int snd_hdac_bus_exec_verb(struct hdac_bus *bus, unsigned int addr,  in snd_hdac_bus_exec_verb()  argument
92 	mutex_lock(&bus->cmd_mutex);  in snd_hdac_bus_exec_verb()
93 	err = snd_hdac_bus_exec_verb_unlocked(bus, addr, cmd, res);  in snd_hdac_bus_exec_verb()
94 	mutex_unlock(&bus->cmd_mutex);  in snd_hdac_bus_exec_verb()
99  * snd_hdac_bus_exec_verb_unlocked - unlocked version
100  * @bus: bus object
101  * @addr: the HDAC device address
102  * @cmd: HD-audio encoded verb
107 int snd_hdac_bus_exec_verb_unlocked(struct hdac_bus *bus, unsigned int addr,  in snd_hdac_bus_exec_verb_unlocked()  argument
114 		return -EINVAL;  in snd_hdac_bus_exec_verb_unlocked()
117 		*res = -1;  in snd_hdac_bus_exec_verb_unlocked()
118 	else if (bus->sync_write)  in snd_hdac_bus_exec_verb_unlocked()
121 		trace_hda_send_cmd(bus, cmd);  in snd_hdac_bus_exec_verb_unlocked()
122 		err = bus->ops->command(bus, cmd);  in snd_hdac_bus_exec_verb_unlocked()
123 		if (err != -EAGAIN)  in snd_hdac_bus_exec_verb_unlocked()
126 		err = bus->ops->get_response(bus, addr, &tmp);  in snd_hdac_bus_exec_verb_unlocked()
131 		err = bus->ops->get_response(bus, addr, res);  in snd_hdac_bus_exec_verb_unlocked()
132 		trace_hda_get_response(bus, addr, *res);  in snd_hdac_bus_exec_verb_unlocked()
139  * snd_hdac_bus_queue_event - add an unsolicited event to queue
140  * @bus: the BUS
142  * @res_ex: codec addr and flags (upper 32bit or RIRB entry)
148 void snd_hdac_bus_queue_event(struct hdac_bus *bus, u32 res, u32 res_ex)  in snd_hdac_bus_queue_event()  argument
152 	if (!bus)  in snd_hdac_bus_queue_event()
155 	trace_hda_unsol_event(bus, res, res_ex);  in snd_hdac_bus_queue_event()
156 	wp = (bus->unsol_wp + 1) % HDA_UNSOL_QUEUE_SIZE;  in snd_hdac_bus_queue_event()
157 	bus->unsol_wp = wp;  in snd_hdac_bus_queue_event()
160 	bus->unsol_queue[wp] = res;  in snd_hdac_bus_queue_event()
161 	bus->unsol_queue[wp + 1] = res_ex;  in snd_hdac_bus_queue_event()
163 	schedule_work(&bus->unsol_work);  in snd_hdac_bus_queue_event()
171 	struct hdac_bus *bus = container_of(work, struct hdac_bus, unsol_work);  in snd_hdac_bus_process_unsol_events()  local
176 	spin_lock_irq(&bus->reg_lock);  in snd_hdac_bus_process_unsol_events()
177 	while (bus->unsol_rp != bus->unsol_wp) {  in snd_hdac_bus_process_unsol_events()
178 		rp = (bus->unsol_rp + 1) % HDA_UNSOL_QUEUE_SIZE;  in snd_hdac_bus_process_unsol_events()
179 		bus->unsol_rp = rp;  in snd_hdac_bus_process_unsol_events()
181 		res = bus->unsol_queue[rp];  in snd_hdac_bus_process_unsol_events()
182 		caddr = bus->unsol_queue[rp + 1];  in snd_hdac_bus_process_unsol_events()
185 		codec = bus->caddr_tbl[caddr & 0x0f];  in snd_hdac_bus_process_unsol_events()
186 		if (!codec || !codec->registered)  in snd_hdac_bus_process_unsol_events()
188 		spin_unlock_irq(&bus->reg_lock);  in snd_hdac_bus_process_unsol_events()
189 		drv = drv_to_hdac_driver(codec->dev.driver);  in snd_hdac_bus_process_unsol_events()
190 		if (drv->unsol_event)  in snd_hdac_bus_process_unsol_events()
191 			drv->unsol_event(codec, res);  in snd_hdac_bus_process_unsol_events()
192 		spin_lock_irq(&bus->reg_lock);  in snd_hdac_bus_process_unsol_events()
194 	spin_unlock_irq(&bus->reg_lock);  in snd_hdac_bus_process_unsol_events()
198  * snd_hdac_bus_add_device - Add a codec to bus
199  * @bus: HDA core bus
202  * Adds the given codec to the list in the bus.  The caddr_tbl array
206 int snd_hdac_bus_add_device(struct hdac_bus *bus, struct hdac_device *codec)  in snd_hdac_bus_add_device()  argument
208 	if (bus->caddr_tbl[codec->addr]) {  in snd_hdac_bus_add_device()
209 		dev_err(bus->dev, "address 0x%x is already occupied\n",  in snd_hdac_bus_add_device()
210 			codec->addr);  in snd_hdac_bus_add_device()
211 		return -EBUSY;  in snd_hdac_bus_add_device()
214 	list_add_tail(&codec->list, &bus->codec_list);  in snd_hdac_bus_add_device()
215 	bus->caddr_tbl[codec->addr] = codec;  in snd_hdac_bus_add_device()
216 	set_bit(codec->addr, &bus->codec_powered);  in snd_hdac_bus_add_device()
217 	bus->num_codecs++;  in snd_hdac_bus_add_device()
222  * snd_hdac_bus_remove_device - Remove a codec from bus
223  * @bus: HDA core bus
226 void snd_hdac_bus_remove_device(struct hdac_bus *bus,  in snd_hdac_bus_remove_device()  argument
229 	WARN_ON(bus != codec->bus);  in snd_hdac_bus_remove_device()
230 	if (list_empty(&codec->list))  in snd_hdac_bus_remove_device()
232 	list_del_init(&codec->list);  in snd_hdac_bus_remove_device()
233 	bus->caddr_tbl[codec->addr] = NULL;  in snd_hdac_bus_remove_device()
234 	clear_bit(codec->addr, &bus->codec_powered);  in snd_hdac_bus_remove_device()
235 	bus->num_codecs--;  in snd_hdac_bus_remove_device()
236 	flush_work(&bus->unsol_work);  in snd_hdac_bus_remove_device()
241 unsigned int snd_hdac_aligned_read(void __iomem *addr, unsigned int mask)  in snd_hdac_aligned_read()  argument
244 		(void __iomem *)((unsigned long)(addr) & ~0x3);  in snd_hdac_aligned_read()
245 	unsigned int shift = ((unsigned long)(addr) & 0x3) << 3;  in snd_hdac_aligned_read()
253 void snd_hdac_aligned_write(unsigned int val, void __iomem *addr,  in snd_hdac_aligned_write()  argument
257 		(void __iomem *)((unsigned long)(addr) & ~0x3);  in snd_hdac_aligned_write()
258 	unsigned int shift = ((unsigned long)(addr) & 0x3) << 3;  in snd_hdac_aligned_write()
271 	struct hdac_bus *bus = codec->bus;  in snd_hdac_codec_link_up()  local
273 	if (bus->ops->link_power)  in snd_hdac_codec_link_up()
274 		bus->ops->link_power(codec, true);  in snd_hdac_codec_link_up()
282 	struct hdac_bus *bus = codec->bus;  in snd_hdac_codec_link_down()  local
284 	if (bus->ops->link_power)  in snd_hdac_codec_link_down()
285 		bus->ops->link_power(codec, false);  in snd_hdac_codec_link_down()