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6#include <linux/init.h>
7#include <linux/io.h>
8#include <linux/device.h>
9#include <linux/module.h>
10#include <linux/export.h>
11#include <sound/hdaudio.h>
12#include "local.h"
13#include "trace.h"
14
15static void snd_hdac_bus_process_unsol_events(struct work_struct *work);
16
17static const struct hdac_bus_ops default_ops = {
18 .command = snd_hdac_bus_send_cmd,
19 .get_response = snd_hdac_bus_get_response,
20};
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30int snd_hdac_bus_init(struct hdac_bus *bus, struct device *dev,
31 const struct hdac_bus_ops *ops)
32{
33 memset(bus, 0, sizeof(*bus));
34 bus->dev = dev;
35 if (ops)
36 bus->ops = ops;
37 else
38 bus->ops = &default_ops;
39 bus->dma_type = SNDRV_DMA_TYPE_DEV;
40 INIT_LIST_HEAD(&bus->stream_list);
41 INIT_LIST_HEAD(&bus->codec_list);
42 INIT_WORK(&bus->unsol_work, snd_hdac_bus_process_unsol_events);
43 spin_lock_init(&bus->reg_lock);
44 mutex_init(&bus->cmd_mutex);
45 mutex_init(&bus->lock);
46 INIT_LIST_HEAD(&bus->hlink_list);
47 init_waitqueue_head(&bus->rirb_wq);
48 bus->irq = -1;
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59 bus->sdo_limit = 8;
60
61 return 0;
62}
63EXPORT_SYMBOL_GPL(snd_hdac_bus_init);
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69void snd_hdac_bus_exit(struct hdac_bus *bus)
70{
71 WARN_ON(!list_empty(&bus->stream_list));
72 WARN_ON(!list_empty(&bus->codec_list));
73 cancel_work_sync(&bus->unsol_work);
74}
75EXPORT_SYMBOL_GPL(snd_hdac_bus_exit);
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86int snd_hdac_bus_exec_verb(struct hdac_bus *bus, unsigned int addr,
87 unsigned int cmd, unsigned int *res)
88{
89 int err;
90
91 mutex_lock(&bus->cmd_mutex);
92 err = snd_hdac_bus_exec_verb_unlocked(bus, addr, cmd, res);
93 mutex_unlock(&bus->cmd_mutex);
94 return err;
95}
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106int snd_hdac_bus_exec_verb_unlocked(struct hdac_bus *bus, unsigned int addr,
107 unsigned int cmd, unsigned int *res)
108{
109 unsigned int tmp;
110 int err;
111
112 if (cmd == ~0)
113 return -EINVAL;
114
115 if (res)
116 *res = -1;
117 else if (bus->sync_write)
118 res = &tmp;
119 for (;;) {
120 trace_hda_send_cmd(bus, cmd);
121 err = bus->ops->command(bus, cmd);
122 if (err != -EAGAIN)
123 break;
124
125 err = bus->ops->get_response(bus, addr, &tmp);
126 if (err)
127 break;
128 }
129 if (!err && res) {
130 err = bus->ops->get_response(bus, addr, res);
131 trace_hda_get_response(bus, addr, *res);
132 }
133 return err;
134}
135EXPORT_SYMBOL_GPL(snd_hdac_bus_exec_verb_unlocked);
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147void snd_hdac_bus_queue_event(struct hdac_bus *bus, u32 res, u32 res_ex)
148{
149 unsigned int wp;
150
151 if (!bus)
152 return;
153
154 trace_hda_unsol_event(bus, res, res_ex);
155 wp = (bus->unsol_wp + 1) % HDA_UNSOL_QUEUE_SIZE;
156 bus->unsol_wp = wp;
157
158 wp <<= 1;
159 bus->unsol_queue[wp] = res;
160 bus->unsol_queue[wp + 1] = res_ex;
161
162 schedule_work(&bus->unsol_work);
163}
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168static void snd_hdac_bus_process_unsol_events(struct work_struct *work)
169{
170 struct hdac_bus *bus = container_of(work, struct hdac_bus, unsol_work);
171 struct hdac_device *codec;
172 struct hdac_driver *drv;
173 unsigned int rp, caddr, res;
174
175 spin_lock_irq(&bus->reg_lock);
176 while (bus->unsol_rp != bus->unsol_wp) {
177 rp = (bus->unsol_rp + 1) % HDA_UNSOL_QUEUE_SIZE;
178 bus->unsol_rp = rp;
179 rp <<= 1;
180 res = bus->unsol_queue[rp];
181 caddr = bus->unsol_queue[rp + 1];
182 if (!(caddr & (1 << 4)))
183 continue;
184 codec = bus->caddr_tbl[caddr & 0x0f];
185 if (!codec || !codec->dev.driver)
186 continue;
187 spin_unlock_irq(&bus->reg_lock);
188 drv = drv_to_hdac_driver(codec->dev.driver);
189 if (drv->unsol_event)
190 drv->unsol_event(codec, res);
191 spin_lock_irq(&bus->reg_lock);
192 }
193 spin_unlock_irq(&bus->reg_lock);
194}
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205int snd_hdac_bus_add_device(struct hdac_bus *bus, struct hdac_device *codec)
206{
207 if (bus->caddr_tbl[codec->addr]) {
208 dev_err(bus->dev, "address 0x%x is already occupied\n",
209 codec->addr);
210 return -EBUSY;
211 }
212
213 list_add_tail(&codec->list, &bus->codec_list);
214 bus->caddr_tbl[codec->addr] = codec;
215 set_bit(codec->addr, &bus->codec_powered);
216 bus->num_codecs++;
217 return 0;
218}
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225void snd_hdac_bus_remove_device(struct hdac_bus *bus,
226 struct hdac_device *codec)
227{
228 WARN_ON(bus != codec->bus);
229 if (list_empty(&codec->list))
230 return;
231 list_del_init(&codec->list);
232 bus->caddr_tbl[codec->addr] = NULL;
233 clear_bit(codec->addr, &bus->codec_powered);
234 bus->num_codecs--;
235 flush_work(&bus->unsol_work);
236}
237
238#ifdef CONFIG_SND_HDA_ALIGNED_MMIO
239
240unsigned int snd_hdac_aligned_read(void __iomem *addr, unsigned int mask)
241{
242 void __iomem *aligned_addr =
243 (void __iomem *)((unsigned long)(addr) & ~0x3);
244 unsigned int shift = ((unsigned long)(addr) & 0x3) << 3;
245 unsigned int v;
246
247 v = readl(aligned_addr);
248 return (v >> shift) & mask;
249}
250EXPORT_SYMBOL_GPL(snd_hdac_aligned_read);
251
252void snd_hdac_aligned_write(unsigned int val, void __iomem *addr,
253 unsigned int mask)
254{
255 void __iomem *aligned_addr =
256 (void __iomem *)((unsigned long)(addr) & ~0x3);
257 unsigned int shift = ((unsigned long)(addr) & 0x3) << 3;
258 unsigned int v;
259
260 v = readl(aligned_addr);
261 v &= ~(mask << shift);
262 v |= val << shift;
263 writel(v, aligned_addr);
264}
265EXPORT_SYMBOL_GPL(snd_hdac_aligned_write);
266#endif
267