1 // SPDX-License-Identifier: GPL-2.0-only
3 * HD-audio core bus driver
6 #include <linux/init.h>
8 #include <linux/device.h>
9 #include <linux/module.h>
10 #include <linux/export.h>
11 #include <sound/hdaudio.h>
15 static void snd_hdac_bus_process_unsol_events(struct work_struct *work);
17 static const struct hdac_bus_ops default_ops = {
18 .command = snd_hdac_bus_send_cmd,
19 .get_response = snd_hdac_bus_get_response,
23 * snd_hdac_bus_init - initialize a HD-audio bas bus
24 * @bus: the pointer to bus object
25 * @ops: bus verb operators
27 * Returns 0 if successful, or a negative error code.
29 int snd_hdac_bus_init(struct hdac_bus *bus, struct device *dev,
30 const struct hdac_bus_ops *ops)
32 memset(bus, 0, sizeof(*bus));
37 bus->ops = &default_ops;
38 bus->dma_type = SNDRV_DMA_TYPE_DEV;
39 INIT_LIST_HEAD(&bus->stream_list);
40 INIT_LIST_HEAD(&bus->codec_list);
41 INIT_WORK(&bus->unsol_work, snd_hdac_bus_process_unsol_events);
42 spin_lock_init(&bus->reg_lock);
43 mutex_init(&bus->cmd_mutex);
44 mutex_init(&bus->lock);
45 INIT_LIST_HEAD(&bus->hlink_list);
46 init_waitqueue_head(&bus->rirb_wq);
50 EXPORT_SYMBOL_GPL(snd_hdac_bus_init);
53 * snd_hdac_bus_exit - clean up a HD-audio bas bus
54 * @bus: the pointer to bus object
56 void snd_hdac_bus_exit(struct hdac_bus *bus)
58 WARN_ON(!list_empty(&bus->stream_list));
59 WARN_ON(!list_empty(&bus->codec_list));
60 cancel_work_sync(&bus->unsol_work);
62 EXPORT_SYMBOL_GPL(snd_hdac_bus_exit);
65 * snd_hdac_bus_exec_verb - execute a HD-audio verb on the given bus
67 * @cmd: HD-audio encoded verb
68 * @res: pointer to store the response, NULL if performing asynchronously
70 * Returns 0 if successful, or a negative error code.
72 int snd_hdac_bus_exec_verb(struct hdac_bus *bus, unsigned int addr,
73 unsigned int cmd, unsigned int *res)
77 mutex_lock(&bus->cmd_mutex);
78 err = snd_hdac_bus_exec_verb_unlocked(bus, addr, cmd, res);
79 mutex_unlock(&bus->cmd_mutex);
82 EXPORT_SYMBOL_GPL(snd_hdac_bus_exec_verb);
85 * snd_hdac_bus_exec_verb_unlocked - unlocked version
87 * @cmd: HD-audio encoded verb
88 * @res: pointer to store the response, NULL if performing asynchronously
90 * Returns 0 if successful, or a negative error code.
92 int snd_hdac_bus_exec_verb_unlocked(struct hdac_bus *bus, unsigned int addr,
93 unsigned int cmd, unsigned int *res)
103 else if (bus->sync_write)
106 trace_hda_send_cmd(bus, cmd);
107 err = bus->ops->command(bus, cmd);
110 /* process pending verbs */
111 err = bus->ops->get_response(bus, addr, &tmp);
116 err = bus->ops->get_response(bus, addr, res);
117 trace_hda_get_response(bus, addr, *res);
121 EXPORT_SYMBOL_GPL(snd_hdac_bus_exec_verb_unlocked);
124 * snd_hdac_bus_queue_event - add an unsolicited event to queue
126 * @res: unsolicited event (lower 32bit of RIRB entry)
127 * @res_ex: codec addr and flags (upper 32bit or RIRB entry)
129 * Adds the given event to the queue. The events are processed in
130 * the workqueue asynchronously. Call this function in the interrupt
131 * hanlder when RIRB receives an unsolicited event.
133 void snd_hdac_bus_queue_event(struct hdac_bus *bus, u32 res, u32 res_ex)
140 trace_hda_unsol_event(bus, res, res_ex);
141 wp = (bus->unsol_wp + 1) % HDA_UNSOL_QUEUE_SIZE;
145 bus->unsol_queue[wp] = res;
146 bus->unsol_queue[wp + 1] = res_ex;
148 schedule_work(&bus->unsol_work);
150 EXPORT_SYMBOL_GPL(snd_hdac_bus_queue_event);
153 * process queued unsolicited events
155 static void snd_hdac_bus_process_unsol_events(struct work_struct *work)
157 struct hdac_bus *bus = container_of(work, struct hdac_bus, unsol_work);
158 struct hdac_device *codec;
159 struct hdac_driver *drv;
160 unsigned int rp, caddr, res;
162 while (bus->unsol_rp != bus->unsol_wp) {
163 rp = (bus->unsol_rp + 1) % HDA_UNSOL_QUEUE_SIZE;
166 res = bus->unsol_queue[rp];
167 caddr = bus->unsol_queue[rp + 1];
168 if (!(caddr & (1 << 4))) /* no unsolicited event? */
170 codec = bus->caddr_tbl[caddr & 0x0f];
171 if (!codec || !codec->dev.driver)
173 drv = drv_to_hdac_driver(codec->dev.driver);
174 if (drv->unsol_event)
175 drv->unsol_event(codec, res);
180 * snd_hdac_bus_add_device - Add a codec to bus
182 * @codec: HDA core device to add
184 * Adds the given codec to the list in the bus. The caddr_tbl array
185 * and codec_powered bits are updated, as well.
186 * Returns zero if success, or a negative error code.
188 int snd_hdac_bus_add_device(struct hdac_bus *bus, struct hdac_device *codec)
190 if (bus->caddr_tbl[codec->addr]) {
191 dev_err(bus->dev, "address 0x%x is already occupied\n",
196 list_add_tail(&codec->list, &bus->codec_list);
197 bus->caddr_tbl[codec->addr] = codec;
198 set_bit(codec->addr, &bus->codec_powered);
204 * snd_hdac_bus_remove_device - Remove a codec from bus
206 * @codec: HDA core device to remove
208 void snd_hdac_bus_remove_device(struct hdac_bus *bus,
209 struct hdac_device *codec)
211 WARN_ON(bus != codec->bus);
212 if (list_empty(&codec->list))
214 list_del_init(&codec->list);
215 bus->caddr_tbl[codec->addr] = NULL;
216 clear_bit(codec->addr, &bus->codec_powered);
218 flush_work(&bus->unsol_work);
221 #ifdef CONFIG_SND_HDA_ALIGNED_MMIO
222 /* Helpers for aligned read/write of mmio space, for Tegra */
223 unsigned int snd_hdac_aligned_read(void __iomem *addr, unsigned int mask)
225 void __iomem *aligned_addr =
226 (void __iomem *)((unsigned long)(addr) & ~0x3);
227 unsigned int shift = ((unsigned long)(addr) & 0x3) << 3;
230 v = readl(aligned_addr);
231 return (v >> shift) & mask;
233 EXPORT_SYMBOL_GPL(snd_hdac_aligned_read);
235 void snd_hdac_aligned_write(unsigned int val, void __iomem *addr,
238 void __iomem *aligned_addr =
239 (void __iomem *)((unsigned long)(addr) & ~0x3);
240 unsigned int shift = ((unsigned long)(addr) & 0x3) << 3;
243 v = readl(aligned_addr);
244 v &= ~(mask << shift);
246 writel(v, aligned_addr);
248 EXPORT_SYMBOL_GPL(snd_hdac_aligned_write);
249 #endif /* CONFIG_SND_HDA_ALIGNED_MMIO */