Commit | Line | Data |
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457c8996 | 1 | // SPDX-License-Identifier: GPL-2.0-only |
d068ebc2 TI |
2 | /* |
3 | * HD-audio core bus driver | |
4 | */ | |
5 | ||
6 | #include <linux/init.h> | |
fe401066 | 7 | #include <linux/io.h> |
d068ebc2 TI |
8 | #include <linux/device.h> |
9 | #include <linux/module.h> | |
10 | #include <linux/export.h> | |
11 | #include <sound/hdaudio.h> | |
53eff75e | 12 | #include "local.h" |
e311782a | 13 | #include "trace.h" |
d068ebc2 | 14 | |
ddf7cb83 TI |
15 | static void snd_hdac_bus_process_unsol_events(struct work_struct *work); |
16 | ||
14752412 TI |
17 | static const struct hdac_bus_ops default_ops = { |
18 | .command = snd_hdac_bus_send_cmd, | |
19 | .get_response = snd_hdac_bus_get_response, | |
f9e5fd1b | 20 | .link_power = snd_hdac_bus_link_power, |
14752412 TI |
21 | }; |
22 | ||
d068ebc2 TI |
23 | /** |
24 | * snd_hdac_bus_init - initialize a HD-audio bas bus | |
25 | * @bus: the pointer to bus object | |
6e57188f | 26 | * @dev: device pointer |
14752412 | 27 | * @ops: bus verb operators |
d068ebc2 TI |
28 | * |
29 | * Returns 0 if successful, or a negative error code. | |
30 | */ | |
31 | int snd_hdac_bus_init(struct hdac_bus *bus, struct device *dev, | |
19abfefd | 32 | const struct hdac_bus_ops *ops) |
d068ebc2 TI |
33 | { |
34 | memset(bus, 0, sizeof(*bus)); | |
35 | bus->dev = dev; | |
14752412 TI |
36 | if (ops) |
37 | bus->ops = ops; | |
38 | else | |
39 | bus->ops = &default_ops; | |
619a1f19 | 40 | bus->dma_type = SNDRV_DMA_TYPE_DEV; |
14752412 | 41 | INIT_LIST_HEAD(&bus->stream_list); |
d068ebc2 | 42 | INIT_LIST_HEAD(&bus->codec_list); |
18d43c9b | 43 | INIT_WORK(&bus->unsol_work, snd_hdac_bus_process_unsol_events); |
14752412 | 44 | spin_lock_init(&bus->reg_lock); |
d068ebc2 | 45 | mutex_init(&bus->cmd_mutex); |
d7a181da | 46 | mutex_init(&bus->lock); |
e61ab9f0 | 47 | INIT_LIST_HEAD(&bus->hlink_list); |
88452da9 | 48 | init_waitqueue_head(&bus->rirb_wq); |
14752412 | 49 | bus->irq = -1; |
b90b925f SP |
50 | |
51 | /* | |
52 | * Default value of '8' is as per the HD audio specification (Rev 1.0a). | |
53 | * Following relation is used to derive STRIPE control value. | |
54 | * For sample rate <= 48K: | |
55 | * { ((num_channels * bits_per_sample) / number of SDOs) >= 8 } | |
56 | * For sample rate > 48K: | |
57 | * { ((num_channels * bits_per_sample * rate/48000) / | |
58 | * number of SDOs) >= 8 } | |
59 | */ | |
60 | bus->sdo_limit = 8; | |
61 | ||
d068ebc2 TI |
62 | return 0; |
63 | } | |
64 | EXPORT_SYMBOL_GPL(snd_hdac_bus_init); | |
65 | ||
66 | /** | |
67 | * snd_hdac_bus_exit - clean up a HD-audio bas bus | |
68 | * @bus: the pointer to bus object | |
69 | */ | |
70 | void snd_hdac_bus_exit(struct hdac_bus *bus) | |
71 | { | |
14752412 | 72 | WARN_ON(!list_empty(&bus->stream_list)); |
d068ebc2 TI |
73 | WARN_ON(!list_empty(&bus->codec_list)); |
74 | cancel_work_sync(&bus->unsol_work); | |
75 | } | |
76 | EXPORT_SYMBOL_GPL(snd_hdac_bus_exit); | |
77 | ||
78 | /** | |
79 | * snd_hdac_bus_exec_verb - execute a HD-audio verb on the given bus | |
80 | * @bus: bus object | |
6e57188f | 81 | * @addr: the HDAC device address |
d068ebc2 TI |
82 | * @cmd: HD-audio encoded verb |
83 | * @res: pointer to store the response, NULL if performing asynchronously | |
84 | * | |
85 | * Returns 0 if successful, or a negative error code. | |
86 | */ | |
87 | int snd_hdac_bus_exec_verb(struct hdac_bus *bus, unsigned int addr, | |
88 | unsigned int cmd, unsigned int *res) | |
89 | { | |
90 | int err; | |
91 | ||
92 | mutex_lock(&bus->cmd_mutex); | |
93 | err = snd_hdac_bus_exec_verb_unlocked(bus, addr, cmd, res); | |
94 | mutex_unlock(&bus->cmd_mutex); | |
95 | return err; | |
96 | } | |
d068ebc2 TI |
97 | |
98 | /** | |
99 | * snd_hdac_bus_exec_verb_unlocked - unlocked version | |
100 | * @bus: bus object | |
6e57188f | 101 | * @addr: the HDAC device address |
d068ebc2 TI |
102 | * @cmd: HD-audio encoded verb |
103 | * @res: pointer to store the response, NULL if performing asynchronously | |
104 | * | |
105 | * Returns 0 if successful, or a negative error code. | |
106 | */ | |
107 | int snd_hdac_bus_exec_verb_unlocked(struct hdac_bus *bus, unsigned int addr, | |
108 | unsigned int cmd, unsigned int *res) | |
109 | { | |
110 | unsigned int tmp; | |
111 | int err; | |
112 | ||
113 | if (cmd == ~0) | |
114 | return -EINVAL; | |
115 | ||
116 | if (res) | |
117 | *res = -1; | |
118 | else if (bus->sync_write) | |
119 | res = &tmp; | |
120 | for (;;) { | |
e311782a | 121 | trace_hda_send_cmd(bus, cmd); |
d068ebc2 TI |
122 | err = bus->ops->command(bus, cmd); |
123 | if (err != -EAGAIN) | |
124 | break; | |
125 | /* process pending verbs */ | |
126 | err = bus->ops->get_response(bus, addr, &tmp); | |
127 | if (err) | |
128 | break; | |
129 | } | |
e311782a | 130 | if (!err && res) { |
d068ebc2 | 131 | err = bus->ops->get_response(bus, addr, res); |
e311782a TI |
132 | trace_hda_get_response(bus, addr, *res); |
133 | } | |
d068ebc2 TI |
134 | return err; |
135 | } | |
136 | EXPORT_SYMBOL_GPL(snd_hdac_bus_exec_verb_unlocked); | |
137 | ||
138 | /** | |
139 | * snd_hdac_bus_queue_event - add an unsolicited event to queue | |
140 | * @bus: the BUS | |
141 | * @res: unsolicited event (lower 32bit of RIRB entry) | |
142 | * @res_ex: codec addr and flags (upper 32bit or RIRB entry) | |
143 | * | |
144 | * Adds the given event to the queue. The events are processed in | |
145 | * the workqueue asynchronously. Call this function in the interrupt | |
146 | * hanlder when RIRB receives an unsolicited event. | |
147 | */ | |
148 | void snd_hdac_bus_queue_event(struct hdac_bus *bus, u32 res, u32 res_ex) | |
149 | { | |
150 | unsigned int wp; | |
151 | ||
152 | if (!bus) | |
153 | return; | |
154 | ||
e311782a | 155 | trace_hda_unsol_event(bus, res, res_ex); |
d068ebc2 TI |
156 | wp = (bus->unsol_wp + 1) % HDA_UNSOL_QUEUE_SIZE; |
157 | bus->unsol_wp = wp; | |
158 | ||
159 | wp <<= 1; | |
160 | bus->unsol_queue[wp] = res; | |
161 | bus->unsol_queue[wp + 1] = res_ex; | |
162 | ||
163 | schedule_work(&bus->unsol_work); | |
164 | } | |
d068ebc2 TI |
165 | |
166 | /* | |
167 | * process queued unsolicited events | |
168 | */ | |
ddf7cb83 | 169 | static void snd_hdac_bus_process_unsol_events(struct work_struct *work) |
d068ebc2 TI |
170 | { |
171 | struct hdac_bus *bus = container_of(work, struct hdac_bus, unsol_work); | |
172 | struct hdac_device *codec; | |
173 | struct hdac_driver *drv; | |
174 | unsigned int rp, caddr, res; | |
175 | ||
c637fa15 | 176 | spin_lock_irq(&bus->reg_lock); |
d068ebc2 TI |
177 | while (bus->unsol_rp != bus->unsol_wp) { |
178 | rp = (bus->unsol_rp + 1) % HDA_UNSOL_QUEUE_SIZE; | |
179 | bus->unsol_rp = rp; | |
180 | rp <<= 1; | |
181 | res = bus->unsol_queue[rp]; | |
182 | caddr = bus->unsol_queue[rp + 1]; | |
183 | if (!(caddr & (1 << 4))) /* no unsolicited event? */ | |
184 | continue; | |
185 | codec = bus->caddr_tbl[caddr & 0x0f]; | |
186 | if (!codec || !codec->dev.driver) | |
187 | continue; | |
c637fa15 | 188 | spin_unlock_irq(&bus->reg_lock); |
d068ebc2 TI |
189 | drv = drv_to_hdac_driver(codec->dev.driver); |
190 | if (drv->unsol_event) | |
191 | drv->unsol_event(codec, res); | |
c637fa15 | 192 | spin_lock_irq(&bus->reg_lock); |
d068ebc2 | 193 | } |
c637fa15 | 194 | spin_unlock_irq(&bus->reg_lock); |
d068ebc2 TI |
195 | } |
196 | ||
78dd5e21 TI |
197 | /** |
198 | * snd_hdac_bus_add_device - Add a codec to bus | |
199 | * @bus: HDA core bus | |
200 | * @codec: HDA core device to add | |
201 | * | |
202 | * Adds the given codec to the list in the bus. The caddr_tbl array | |
203 | * and codec_powered bits are updated, as well. | |
204 | * Returns zero if success, or a negative error code. | |
205 | */ | |
d068ebc2 TI |
206 | int snd_hdac_bus_add_device(struct hdac_bus *bus, struct hdac_device *codec) |
207 | { | |
208 | if (bus->caddr_tbl[codec->addr]) { | |
209 | dev_err(bus->dev, "address 0x%x is already occupied\n", | |
210 | codec->addr); | |
211 | return -EBUSY; | |
212 | } | |
213 | ||
214 | list_add_tail(&codec->list, &bus->codec_list); | |
215 | bus->caddr_tbl[codec->addr] = codec; | |
216 | set_bit(codec->addr, &bus->codec_powered); | |
217 | bus->num_codecs++; | |
218 | return 0; | |
219 | } | |
d068ebc2 | 220 | |
78dd5e21 TI |
221 | /** |
222 | * snd_hdac_bus_remove_device - Remove a codec from bus | |
223 | * @bus: HDA core bus | |
224 | * @codec: HDA core device to remove | |
225 | */ | |
d068ebc2 TI |
226 | void snd_hdac_bus_remove_device(struct hdac_bus *bus, |
227 | struct hdac_device *codec) | |
228 | { | |
229 | WARN_ON(bus != codec->bus); | |
230 | if (list_empty(&codec->list)) | |
231 | return; | |
232 | list_del_init(&codec->list); | |
233 | bus->caddr_tbl[codec->addr] = NULL; | |
234 | clear_bit(codec->addr, &bus->codec_powered); | |
235 | bus->num_codecs--; | |
eb8d0eaa | 236 | flush_work(&bus->unsol_work); |
d068ebc2 | 237 | } |
19abfefd TI |
238 | |
239 | #ifdef CONFIG_SND_HDA_ALIGNED_MMIO | |
240 | /* Helpers for aligned read/write of mmio space, for Tegra */ | |
241 | unsigned int snd_hdac_aligned_read(void __iomem *addr, unsigned int mask) | |
242 | { | |
243 | void __iomem *aligned_addr = | |
244 | (void __iomem *)((unsigned long)(addr) & ~0x3); | |
245 | unsigned int shift = ((unsigned long)(addr) & 0x3) << 3; | |
246 | unsigned int v; | |
247 | ||
248 | v = readl(aligned_addr); | |
249 | return (v >> shift) & mask; | |
250 | } | |
251 | EXPORT_SYMBOL_GPL(snd_hdac_aligned_read); | |
252 | ||
253 | void snd_hdac_aligned_write(unsigned int val, void __iomem *addr, | |
254 | unsigned int mask) | |
255 | { | |
256 | void __iomem *aligned_addr = | |
257 | (void __iomem *)((unsigned long)(addr) & ~0x3); | |
258 | unsigned int shift = ((unsigned long)(addr) & 0x3) << 3; | |
259 | unsigned int v; | |
260 | ||
261 | v = readl(aligned_addr); | |
262 | v &= ~(mask << shift); | |
263 | v |= val << shift; | |
264 | writel(v, aligned_addr); | |
265 | } | |
266 | EXPORT_SYMBOL_GPL(snd_hdac_aligned_write); | |
267 | #endif /* CONFIG_SND_HDA_ALIGNED_MMIO */ | |
f9e5fd1b KV |
268 | |
269 | void snd_hdac_codec_link_up(struct hdac_device *codec) | |
270 | { | |
271 | struct hdac_bus *bus = codec->bus; | |
272 | ||
273 | if (bus->ops->link_power) | |
274 | bus->ops->link_power(codec, true); | |
275 | else | |
276 | snd_hdac_bus_link_power(codec, true); | |
277 | } | |
278 | EXPORT_SYMBOL_GPL(snd_hdac_codec_link_up); | |
279 | ||
280 | void snd_hdac_codec_link_down(struct hdac_device *codec) | |
281 | { | |
282 | struct hdac_bus *bus = codec->bus; | |
283 | ||
284 | if (bus->ops->link_power) | |
285 | bus->ops->link_power(codec, false); | |
286 | else | |
287 | snd_hdac_bus_link_power(codec, false); | |
288 | } | |
289 | EXPORT_SYMBOL_GPL(snd_hdac_codec_link_down); |