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0b00a561 JK |
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 | ||
0b00a561 JK |
32 | /* |
33 | * processing pipe helpers - these helpers are useful for dealing with HDA | |
34 | * new capability of processing pipelines | |
35 | */ | |
36 | ||
37 | /** | |
38 | * snd_hdac_ext_bus_ppcap_enable - enable/disable processing pipe capability | |
39 | * @ebus: HD-audio extended core bus | |
40 | * @enable: flag to turn on/off the capability | |
41 | */ | |
42 | void snd_hdac_ext_bus_ppcap_enable(struct hdac_ext_bus *ebus, bool enable) | |
43 | { | |
44 | struct hdac_bus *bus = &ebus->bus; | |
45 | ||
ec8ae570 | 46 | if (!bus->ppcap) { |
0b00a561 JK |
47 | dev_err(bus->dev, "Address of PP capability is NULL"); |
48 | return; | |
49 | } | |
50 | ||
51 | if (enable) | |
ec8ae570 | 52 | snd_hdac_updatel(bus->ppcap, AZX_REG_PP_PPCTL, 0, AZX_PPCTL_GPROCEN); |
0b00a561 | 53 | else |
ec8ae570 | 54 | snd_hdac_updatel(bus->ppcap, AZX_REG_PP_PPCTL, AZX_PPCTL_GPROCEN, 0); |
0b00a561 JK |
55 | } |
56 | EXPORT_SYMBOL_GPL(snd_hdac_ext_bus_ppcap_enable); | |
57 | ||
58 | /** | |
59 | * snd_hdac_ext_bus_ppcap_int_enable - ppcap interrupt enable/disable | |
60 | * @ebus: HD-audio extended core bus | |
61 | * @enable: flag to enable/disable interrupt | |
62 | */ | |
63 | void snd_hdac_ext_bus_ppcap_int_enable(struct hdac_ext_bus *ebus, bool enable) | |
64 | { | |
65 | struct hdac_bus *bus = &ebus->bus; | |
66 | ||
ec8ae570 | 67 | if (!bus->ppcap) { |
0b00a561 JK |
68 | dev_err(bus->dev, "Address of PP capability is NULL\n"); |
69 | return; | |
70 | } | |
71 | ||
72 | if (enable) | |
ec8ae570 | 73 | snd_hdac_updatel(bus->ppcap, AZX_REG_PP_PPCTL, 0, AZX_PPCTL_PIE); |
0b00a561 | 74 | else |
ec8ae570 | 75 | snd_hdac_updatel(bus->ppcap, AZX_REG_PP_PPCTL, AZX_PPCTL_PIE, 0); |
0b00a561 JK |
76 | } |
77 | EXPORT_SYMBOL_GPL(snd_hdac_ext_bus_ppcap_int_enable); | |
78 | ||
79 | /* | |
80 | * Multilink helpers - these helpers are useful for dealing with HDA | |
81 | * new multilink capability | |
82 | */ | |
83 | ||
84 | /** | |
85 | * snd_hdac_ext_bus_get_ml_capabilities - get multilink capability | |
86 | * @ebus: HD-audio extended core bus | |
87 | * | |
88 | * This will parse all links and read the mlink capabilities and add them | |
89 | * in hlink_list of extended hdac bus | |
90 | * Note: this will be freed on bus exit by driver | |
91 | */ | |
92 | int snd_hdac_ext_bus_get_ml_capabilities(struct hdac_ext_bus *ebus) | |
93 | { | |
94 | int idx; | |
95 | u32 link_count; | |
96 | struct hdac_ext_link *hlink; | |
97 | struct hdac_bus *bus = &ebus->bus; | |
98 | ||
ec8ae570 | 99 | link_count = readl(bus->mlcap + AZX_REG_ML_MLCD) + 1; |
0b00a561 JK |
100 | |
101 | dev_dbg(bus->dev, "In %s Link count: %d\n", __func__, link_count); | |
102 | ||
103 | for (idx = 0; idx < link_count; idx++) { | |
104 | hlink = kzalloc(sizeof(*hlink), GFP_KERNEL); | |
105 | if (!hlink) | |
106 | return -ENOMEM; | |
107 | hlink->index = idx; | |
108 | hlink->bus = bus; | |
ec8ae570 | 109 | hlink->ml_addr = bus->mlcap + AZX_ML_BASE + |
0b00a561 | 110 | (AZX_ML_INTERVAL * idx); |
a7e3dd85 JK |
111 | hlink->lcaps = readl(hlink->ml_addr + AZX_REG_ML_LCAP); |
112 | hlink->lsdiid = readw(hlink->ml_addr + AZX_REG_ML_LSDIID); | |
0b00a561 | 113 | |
4446085d VK |
114 | /* since link in On, update the ref */ |
115 | hlink->ref_count = 1; | |
116 | ||
0b00a561 JK |
117 | list_add_tail(&hlink->list, &ebus->hlink_list); |
118 | } | |
119 | ||
120 | return 0; | |
121 | } | |
122 | EXPORT_SYMBOL_GPL(snd_hdac_ext_bus_get_ml_capabilities); | |
123 | ||
bab4445f VK |
124 | /** |
125 | * snd_hdac_link_free_all- free hdac extended link objects | |
126 | * | |
127 | * @ebus: HD-audio ext core bus | |
128 | */ | |
129 | ||
130 | void snd_hdac_link_free_all(struct hdac_ext_bus *ebus) | |
131 | { | |
132 | struct hdac_ext_link *l; | |
133 | ||
134 | while (!list_empty(&ebus->hlink_list)) { | |
135 | l = list_first_entry(&ebus->hlink_list, struct hdac_ext_link, list); | |
136 | list_del(&l->list); | |
137 | kfree(l); | |
138 | } | |
139 | } | |
140 | EXPORT_SYMBOL_GPL(snd_hdac_link_free_all); | |
141 | ||
0b00a561 JK |
142 | /** |
143 | * snd_hdac_ext_bus_get_link_index - get link based on codec name | |
144 | * @ebus: HD-audio extended core bus | |
145 | * @codec_name: codec name | |
146 | */ | |
147 | struct hdac_ext_link *snd_hdac_ext_bus_get_link(struct hdac_ext_bus *ebus, | |
148 | const char *codec_name) | |
149 | { | |
150 | int i; | |
151 | struct hdac_ext_link *hlink = NULL; | |
152 | int bus_idx, addr; | |
153 | ||
154 | if (sscanf(codec_name, "ehdaudio%dD%d", &bus_idx, &addr) != 2) | |
155 | return NULL; | |
156 | if (ebus->idx != bus_idx) | |
157 | return NULL; | |
158 | ||
159 | list_for_each_entry(hlink, &ebus->hlink_list, list) { | |
160 | for (i = 0; i < HDA_MAX_CODECS; i++) { | |
161 | if (hlink->lsdiid & (0x1 << addr)) | |
162 | return hlink; | |
163 | } | |
164 | } | |
165 | ||
166 | return NULL; | |
167 | } | |
168 | EXPORT_SYMBOL_GPL(snd_hdac_ext_bus_get_link); | |
169 | ||
170 | static int check_hdac_link_power_active(struct hdac_ext_link *link, bool enable) | |
171 | { | |
172 | int timeout; | |
173 | u32 val; | |
dde5bff5 | 174 | int mask = (1 << AZX_MLCTL_CPA_SHIFT); |
0b00a561 JK |
175 | |
176 | udelay(3); | |
cf8fe58b | 177 | timeout = 150; |
0b00a561 JK |
178 | |
179 | do { | |
a7e3dd85 | 180 | val = readl(link->ml_addr + AZX_REG_ML_LCTL); |
0b00a561 | 181 | if (enable) { |
dde5bff5 | 182 | if (((val & mask) >> AZX_MLCTL_CPA_SHIFT)) |
0b00a561 JK |
183 | return 0; |
184 | } else { | |
dde5bff5 | 185 | if (!((val & mask) >> AZX_MLCTL_CPA_SHIFT)) |
0b00a561 JK |
186 | return 0; |
187 | } | |
188 | udelay(3); | |
189 | } while (--timeout); | |
190 | ||
191 | return -EIO; | |
192 | } | |
193 | ||
194 | /** | |
195 | * snd_hdac_ext_bus_link_power_up -power up hda link | |
196 | * @link: HD-audio extended link | |
197 | */ | |
198 | int snd_hdac_ext_bus_link_power_up(struct hdac_ext_link *link) | |
199 | { | |
a7e3dd85 | 200 | snd_hdac_updatel(link->ml_addr, AZX_REG_ML_LCTL, 0, AZX_MLCTL_SPA); |
0b00a561 JK |
201 | |
202 | return check_hdac_link_power_active(link, true); | |
203 | } | |
204 | EXPORT_SYMBOL_GPL(snd_hdac_ext_bus_link_power_up); | |
205 | ||
206 | /** | |
207 | * snd_hdac_ext_bus_link_power_down -power down hda link | |
208 | * @link: HD-audio extended link | |
209 | */ | |
210 | int snd_hdac_ext_bus_link_power_down(struct hdac_ext_link *link) | |
211 | { | |
a7e3dd85 | 212 | snd_hdac_updatel(link->ml_addr, AZX_REG_ML_LCTL, AZX_MLCTL_SPA, 0); |
0b00a561 JK |
213 | |
214 | return check_hdac_link_power_active(link, false); | |
215 | } | |
216 | EXPORT_SYMBOL_GPL(snd_hdac_ext_bus_link_power_down); | |
c5b0c09b | 217 | |
6706a197 VK |
218 | /** |
219 | * snd_hdac_ext_bus_link_power_up_all -power up all hda link | |
220 | * @ebus: HD-audio extended bus | |
221 | */ | |
222 | int snd_hdac_ext_bus_link_power_up_all(struct hdac_ext_bus *ebus) | |
223 | { | |
224 | struct hdac_ext_link *hlink = NULL; | |
225 | int ret; | |
226 | ||
227 | list_for_each_entry(hlink, &ebus->hlink_list, list) { | |
228 | snd_hdac_updatel(hlink->ml_addr, | |
229 | AZX_REG_ML_LCTL, 0, AZX_MLCTL_SPA); | |
230 | ret = check_hdac_link_power_active(hlink, true); | |
231 | if (ret < 0) | |
232 | return ret; | |
233 | } | |
234 | ||
235 | return 0; | |
236 | } | |
237 | EXPORT_SYMBOL_GPL(snd_hdac_ext_bus_link_power_up_all); | |
238 | ||
c5b0c09b JK |
239 | /** |
240 | * snd_hdac_ext_bus_link_power_down_all -power down all hda link | |
241 | * @ebus: HD-audio extended bus | |
242 | */ | |
243 | int snd_hdac_ext_bus_link_power_down_all(struct hdac_ext_bus *ebus) | |
244 | { | |
245 | struct hdac_ext_link *hlink = NULL; | |
246 | int ret; | |
247 | ||
248 | list_for_each_entry(hlink, &ebus->hlink_list, list) { | |
249 | snd_hdac_updatel(hlink->ml_addr, AZX_REG_ML_LCTL, AZX_MLCTL_SPA, 0); | |
250 | ret = check_hdac_link_power_active(hlink, false); | |
251 | if (ret < 0) | |
252 | return ret; | |
253 | } | |
254 | ||
255 | return 0; | |
256 | } | |
257 | EXPORT_SYMBOL_GPL(snd_hdac_ext_bus_link_power_down_all); | |
4446085d VK |
258 | |
259 | int snd_hdac_ext_bus_link_get(struct hdac_ext_bus *ebus, | |
260 | struct hdac_ext_link *link) | |
261 | { | |
262 | int ret = 0; | |
263 | ||
264 | mutex_lock(&ebus->lock); | |
265 | ||
266 | /* | |
267 | * if we move from 0 to 1, count will be 1 so power up this link | |
268 | * as well, also check the dma status and trigger that | |
269 | */ | |
270 | if (++link->ref_count == 1) { | |
271 | if (!ebus->cmd_dma_state) { | |
272 | snd_hdac_bus_init_cmd_io(&ebus->bus); | |
273 | ebus->cmd_dma_state = true; | |
274 | } | |
275 | ||
276 | ret = snd_hdac_ext_bus_link_power_up(link); | |
277 | } | |
278 | ||
279 | mutex_unlock(&ebus->lock); | |
280 | return ret; | |
281 | } | |
282 | EXPORT_SYMBOL_GPL(snd_hdac_ext_bus_link_get); | |
283 | ||
284 | int snd_hdac_ext_bus_link_put(struct hdac_ext_bus *ebus, | |
285 | struct hdac_ext_link *link) | |
286 | { | |
287 | int ret = 0; | |
288 | struct hdac_ext_link *hlink; | |
289 | bool link_up = false; | |
290 | ||
291 | mutex_lock(&ebus->lock); | |
292 | ||
293 | /* | |
294 | * if we move from 1 to 0, count will be 0 | |
295 | * so power down this link as well | |
296 | */ | |
297 | if (--link->ref_count == 0) { | |
298 | ret = snd_hdac_ext_bus_link_power_down(link); | |
299 | ||
300 | /* | |
301 | * now check if all links are off, if so turn off | |
302 | * cmd dma as well | |
303 | */ | |
304 | list_for_each_entry(hlink, &ebus->hlink_list, list) { | |
305 | if (hlink->ref_count) { | |
306 | link_up = true; | |
307 | break; | |
308 | } | |
309 | } | |
310 | ||
311 | if (!link_up) { | |
312 | snd_hdac_bus_stop_cmd_io(&ebus->bus); | |
313 | ebus->cmd_dma_state = false; | |
314 | } | |
315 | } | |
316 | ||
317 | mutex_unlock(&ebus->lock); | |
318 | return ret; | |
319 | } | |
320 | EXPORT_SYMBOL_GPL(snd_hdac_ext_bus_link_put); |