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ALSA: hda: add hda link cleanup routine
[karo-tx-linux.git] / sound / hda / ext / hdac_ext_controller.c
1 /*
2  *  hdac-ext-controller.c - HD-audio extended controller functions.
3  *
4  *  Copyright (C) 2014-2015 Intel Corp
5  *  Author: Jeeja KP <jeeja.kp@intel.com>
6  *  ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
7  *
8  *  This program is free software; you can redistribute it and/or modify
9  *  it under the terms of the GNU General Public License as published by
10  *  the Free Software Foundation; version 2 of the License.
11  *
12  *  This program is distributed in the hope that it will be useful, but
13  *  WITHOUT ANY WARRANTY; without even the implied warranty of
14  *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
15  *  General Public License for more details.
16  *
17  * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
18  */
19
20 #include <linux/delay.h>
21 #include <linux/slab.h>
22 #include <sound/hda_register.h>
23 #include <sound/hdaudio_ext.h>
24
25 /*
26  * maximum HDAC capablities we should parse to avoid endless looping:
27  * currently we have 4 extended caps, so this is future proof for now.
28  * extend when this limit is seen meeting in real HW
29  */
30 #define HDAC_MAX_CAPS 10
31
32 /**
33  * snd_hdac_ext_bus_parse_capabilities - parse capablity structure
34  * @ebus: the pointer to extended bus object
35  *
36  * Returns 0 if successful, or a negative error code.
37  */
38 int snd_hdac_ext_bus_parse_capabilities(struct hdac_ext_bus *ebus)
39 {
40         unsigned int cur_cap;
41         unsigned int offset;
42         struct hdac_bus *bus = &ebus->bus;
43         unsigned int counter = 0;
44
45         offset = snd_hdac_chip_readl(bus, LLCH);
46
47         if (offset < 0)
48                 return -EIO;
49
50         /* Lets walk the linked capabilities list */
51         do {
52                 cur_cap = _snd_hdac_chip_read(l, bus, offset);
53
54                 if (cur_cap < 0)
55                         return -EIO;
56
57                 dev_dbg(bus->dev, "Capability version: 0x%x\n",
58                                 ((cur_cap & AZX_CAP_HDR_VER_MASK) >> AZX_CAP_HDR_VER_OFF));
59
60                 dev_dbg(bus->dev, "HDA capability ID: 0x%x\n",
61                                 (cur_cap & AZX_CAP_HDR_ID_MASK) >> AZX_CAP_HDR_ID_OFF);
62
63                 switch ((cur_cap & AZX_CAP_HDR_ID_MASK) >> AZX_CAP_HDR_ID_OFF) {
64                 case AZX_ML_CAP_ID:
65                         dev_dbg(bus->dev, "Found ML capability\n");
66                         ebus->mlcap = bus->remap_addr + offset;
67                         break;
68
69                 case AZX_GTS_CAP_ID:
70                         dev_dbg(bus->dev, "Found GTS capability offset=%x\n", offset);
71                         ebus->gtscap = bus->remap_addr + offset;
72                         break;
73
74                 case AZX_PP_CAP_ID:
75                         /* PP capability found, the Audio DSP is present */
76                         dev_dbg(bus->dev, "Found PP capability offset=%x\n", offset);
77                         ebus->ppcap = bus->remap_addr + offset;
78                         break;
79
80                 case AZX_SPB_CAP_ID:
81                         /* SPIB capability found, handler function */
82                         dev_dbg(bus->dev, "Found SPB capability\n");
83                         ebus->spbcap = bus->remap_addr + offset;
84                         break;
85
86                 default:
87                         dev_dbg(bus->dev, "Unknown capability %d\n", cur_cap);
88                         break;
89                 }
90
91                 counter++;
92
93                 if (counter > HDAC_MAX_CAPS) {
94                         dev_err(bus->dev, "We exceeded HDAC Ext capablities!!!\n");
95                         break;
96                 }
97
98                 /* read the offset of next capabiity */
99                 offset = cur_cap & AZX_CAP_HDR_NXT_PTR_MASK;
100
101         } while (offset);
102
103         return 0;
104 }
105 EXPORT_SYMBOL_GPL(snd_hdac_ext_bus_parse_capabilities);
106
107 /*
108  * processing pipe helpers - these helpers are useful for dealing with HDA
109  * new capability of processing pipelines
110  */
111
112 /**
113  * snd_hdac_ext_bus_ppcap_enable - enable/disable processing pipe capability
114  * @ebus: HD-audio extended core bus
115  * @enable: flag to turn on/off the capability
116  */
117 void snd_hdac_ext_bus_ppcap_enable(struct hdac_ext_bus *ebus, bool enable)
118 {
119         struct hdac_bus *bus = &ebus->bus;
120
121         if (!ebus->ppcap) {
122                 dev_err(bus->dev, "Address of PP capability is NULL");
123                 return;
124         }
125
126         if (enable)
127                 snd_hdac_updatel(ebus->ppcap, AZX_REG_PP_PPCTL, 0, AZX_PPCTL_GPROCEN);
128         else
129                 snd_hdac_updatel(ebus->ppcap, AZX_REG_PP_PPCTL, AZX_PPCTL_GPROCEN, 0);
130 }
131 EXPORT_SYMBOL_GPL(snd_hdac_ext_bus_ppcap_enable);
132
133 /**
134  * snd_hdac_ext_bus_ppcap_int_enable - ppcap interrupt enable/disable
135  * @ebus: HD-audio extended core bus
136  * @enable: flag to enable/disable interrupt
137  */
138 void snd_hdac_ext_bus_ppcap_int_enable(struct hdac_ext_bus *ebus, bool enable)
139 {
140         struct hdac_bus *bus = &ebus->bus;
141
142         if (!ebus->ppcap) {
143                 dev_err(bus->dev, "Address of PP capability is NULL\n");
144                 return;
145         }
146
147         if (enable)
148                 snd_hdac_updatel(ebus->ppcap, AZX_REG_PP_PPCTL, 0, AZX_PPCTL_PIE);
149         else
150                 snd_hdac_updatel(ebus->ppcap, AZX_REG_PP_PPCTL, AZX_PPCTL_PIE, 0);
151 }
152 EXPORT_SYMBOL_GPL(snd_hdac_ext_bus_ppcap_int_enable);
153
154 /*
155  * Multilink helpers - these helpers are useful for dealing with HDA
156  * new multilink capability
157  */
158
159 /**
160  * snd_hdac_ext_bus_get_ml_capabilities - get multilink capability
161  * @ebus: HD-audio extended core bus
162  *
163  * This will parse all links and read the mlink capabilities and add them
164  * in hlink_list of extended hdac bus
165  * Note: this will be freed on bus exit by driver
166  */
167 int snd_hdac_ext_bus_get_ml_capabilities(struct hdac_ext_bus *ebus)
168 {
169         int idx;
170         u32 link_count;
171         struct hdac_ext_link *hlink;
172         struct hdac_bus *bus = &ebus->bus;
173
174         link_count = readl(ebus->mlcap + AZX_REG_ML_MLCD) + 1;
175
176         dev_dbg(bus->dev, "In %s Link count: %d\n", __func__, link_count);
177
178         for (idx = 0; idx < link_count; idx++) {
179                 hlink  = kzalloc(sizeof(*hlink), GFP_KERNEL);
180                 if (!hlink)
181                         return -ENOMEM;
182                 hlink->index = idx;
183                 hlink->bus = bus;
184                 hlink->ml_addr = ebus->mlcap + AZX_ML_BASE +
185                                         (AZX_ML_INTERVAL * idx);
186                 hlink->lcaps  = snd_hdac_chip_readl(bus, ML_LCAP);
187                 hlink->lsdiid = snd_hdac_chip_readw(bus, ML_LSDIID);
188
189                 list_add_tail(&hlink->list, &ebus->hlink_list);
190         }
191
192         return 0;
193 }
194 EXPORT_SYMBOL_GPL(snd_hdac_ext_bus_get_ml_capabilities);
195
196 /**
197  * snd_hdac_link_free_all- free hdac extended link objects
198  *
199  * @ebus: HD-audio ext core bus
200  */
201
202 void snd_hdac_link_free_all(struct hdac_ext_bus *ebus)
203 {
204         struct hdac_ext_link *l;
205
206         while (!list_empty(&ebus->hlink_list)) {
207                 l = list_first_entry(&ebus->hlink_list, struct hdac_ext_link, list);
208                 list_del(&l->list);
209                 kfree(l);
210         }
211 }
212 EXPORT_SYMBOL_GPL(snd_hdac_link_free_all);
213
214 /**
215  * snd_hdac_ext_bus_get_link_index - get link based on codec name
216  * @ebus: HD-audio extended core bus
217  * @codec_name: codec name
218  */
219 struct hdac_ext_link *snd_hdac_ext_bus_get_link(struct hdac_ext_bus *ebus,
220                                                  const char *codec_name)
221 {
222         int i;
223         struct hdac_ext_link *hlink = NULL;
224         int bus_idx, addr;
225
226         if (sscanf(codec_name, "ehdaudio%dD%d", &bus_idx, &addr) != 2)
227                 return NULL;
228         if (ebus->idx != bus_idx)
229                 return NULL;
230
231         list_for_each_entry(hlink, &ebus->hlink_list, list) {
232                 for (i = 0; i < HDA_MAX_CODECS; i++) {
233                         if (hlink->lsdiid & (0x1 << addr))
234                                 return hlink;
235                 }
236         }
237
238         return NULL;
239 }
240 EXPORT_SYMBOL_GPL(snd_hdac_ext_bus_get_link);
241
242 static int check_hdac_link_power_active(struct hdac_ext_link *link, bool enable)
243 {
244         int timeout;
245         u32 val;
246         int mask = (1 << AZX_MLCTL_CPA);
247
248         udelay(3);
249         timeout = 50;
250
251         do {
252                 val = snd_hdac_chip_readl(link->bus, ML_LCTL);
253                 if (enable) {
254                         if (((val & mask) >> AZX_MLCTL_CPA))
255                                 return 0;
256                 } else {
257                         if (!((val & mask) >> AZX_MLCTL_CPA))
258                                 return 0;
259                 }
260                 udelay(3);
261         } while (--timeout);
262
263         return -EIO;
264 }
265
266 /**
267  * snd_hdac_ext_bus_link_power_up -power up hda link
268  * @link: HD-audio extended link
269  */
270 int snd_hdac_ext_bus_link_power_up(struct hdac_ext_link *link)
271 {
272         snd_hdac_chip_updatel(link->bus, ML_LCTL, 0, AZX_MLCTL_SPA);
273
274         return check_hdac_link_power_active(link, true);
275 }
276 EXPORT_SYMBOL_GPL(snd_hdac_ext_bus_link_power_up);
277
278 /**
279  * snd_hdac_ext_bus_link_power_down -power down hda link
280  * @link: HD-audio extended link
281  */
282 int snd_hdac_ext_bus_link_power_down(struct hdac_ext_link *link)
283 {
284         snd_hdac_chip_updatel(link->bus, ML_LCTL, AZX_MLCTL_SPA, 0);
285
286         return check_hdac_link_power_active(link, false);
287 }
288 EXPORT_SYMBOL_GPL(snd_hdac_ext_bus_link_power_down);