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