2 * hdac-ext-controller.c - HD-audio extended controller functions.
4 * Copyright (C) 2014-2015 Intel Corp
5 * Author: Jeeja KP <jeeja.kp@intel.com>
6 * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
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.
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.
17 * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
20 #include <linux/delay.h>
21 #include <linux/slab.h>
22 #include <sound/hda_register.h>
23 #include <sound/hdaudio_ext.h>
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
30 #define HDAC_MAX_CAPS 10
33 * processing pipe helpers - these helpers are useful for dealing with HDA
34 * new capability of processing pipelines
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
42 void snd_hdac_ext_bus_ppcap_enable(struct hdac_bus *bus, bool enable)
46 dev_err(bus->dev, "Address of PP capability is NULL");
51 snd_hdac_updatel(bus->ppcap, AZX_REG_PP_PPCTL,
52 AZX_PPCTL_GPROCEN, AZX_PPCTL_GPROCEN);
54 snd_hdac_updatel(bus->ppcap, AZX_REG_PP_PPCTL,
55 AZX_PPCTL_GPROCEN, 0);
57 EXPORT_SYMBOL_GPL(snd_hdac_ext_bus_ppcap_enable);
60 * snd_hdac_ext_bus_ppcap_int_enable - ppcap interrupt enable/disable
61 * @ebus: HD-audio extended core bus
62 * @enable: flag to enable/disable interrupt
64 void snd_hdac_ext_bus_ppcap_int_enable(struct hdac_bus *bus, bool enable)
68 dev_err(bus->dev, "Address of PP capability is NULL\n");
73 snd_hdac_updatel(bus->ppcap, AZX_REG_PP_PPCTL,
74 AZX_PPCTL_PIE, AZX_PPCTL_PIE);
76 snd_hdac_updatel(bus->ppcap, AZX_REG_PP_PPCTL,
79 EXPORT_SYMBOL_GPL(snd_hdac_ext_bus_ppcap_int_enable);
82 * Multilink helpers - these helpers are useful for dealing with HDA
83 * new multilink capability
87 * snd_hdac_ext_bus_get_ml_capabilities - get multilink capability
88 * @ebus: HD-audio extended core bus
90 * This will parse all links and read the mlink capabilities and add them
91 * in hlink_list of extended hdac bus
92 * Note: this will be freed on bus exit by driver
94 int snd_hdac_ext_bus_get_ml_capabilities(struct hdac_bus *bus)
98 struct hdac_ext_link *hlink;
100 link_count = readl(bus->mlcap + AZX_REG_ML_MLCD) + 1;
102 dev_dbg(bus->dev, "In %s Link count: %d\n", __func__, link_count);
104 for (idx = 0; idx < link_count; idx++) {
105 hlink = kzalloc(sizeof(*hlink), GFP_KERNEL);
110 hlink->ml_addr = bus->mlcap + AZX_ML_BASE +
111 (AZX_ML_INTERVAL * idx);
112 hlink->lcaps = readl(hlink->ml_addr + AZX_REG_ML_LCAP);
113 hlink->lsdiid = readw(hlink->ml_addr + AZX_REG_ML_LSDIID);
115 /* since link in On, update the ref */
116 hlink->ref_count = 1;
118 list_add_tail(&hlink->list, &bus->hlink_list);
123 EXPORT_SYMBOL_GPL(snd_hdac_ext_bus_get_ml_capabilities);
126 * snd_hdac_link_free_all- free hdac extended link objects
128 * @ebus: HD-audio ext core bus
131 void snd_hdac_link_free_all(struct hdac_bus *bus)
133 struct hdac_ext_link *l;
135 while (!list_empty(&bus->hlink_list)) {
136 l = list_first_entry(&bus->hlink_list, struct hdac_ext_link, list);
141 EXPORT_SYMBOL_GPL(snd_hdac_link_free_all);
144 * snd_hdac_ext_bus_get_link_index - get link based on codec name
145 * @ebus: HD-audio extended core bus
146 * @codec_name: codec name
148 struct hdac_ext_link *snd_hdac_ext_bus_get_link(struct hdac_bus *bus,
149 const char *codec_name)
152 struct hdac_ext_link *hlink = NULL;
155 if (sscanf(codec_name, "ehdaudio%dD%d", &bus_idx, &addr) != 2)
157 if (bus->idx != bus_idx)
159 if (addr < 0 || addr > 31)
162 list_for_each_entry(hlink, &bus->hlink_list, list) {
163 for (i = 0; i < HDA_MAX_CODECS; i++) {
164 if (hlink->lsdiid & (0x1 << addr))
171 EXPORT_SYMBOL_GPL(snd_hdac_ext_bus_get_link);
173 static int check_hdac_link_power_active(struct hdac_ext_link *link, bool enable)
177 int mask = (1 << AZX_MLCTL_CPA_SHIFT);
183 val = readl(link->ml_addr + AZX_REG_ML_LCTL);
185 if (((val & mask) >> AZX_MLCTL_CPA_SHIFT))
188 if (!((val & mask) >> AZX_MLCTL_CPA_SHIFT))
198 * snd_hdac_ext_bus_link_power_up -power up hda link
199 * @link: HD-audio extended link
201 int snd_hdac_ext_bus_link_power_up(struct hdac_ext_link *link)
203 snd_hdac_updatel(link->ml_addr, AZX_REG_ML_LCTL,
204 AZX_MLCTL_SPA, AZX_MLCTL_SPA);
206 return check_hdac_link_power_active(link, true);
208 EXPORT_SYMBOL_GPL(snd_hdac_ext_bus_link_power_up);
211 * snd_hdac_ext_bus_link_power_down -power down hda link
212 * @link: HD-audio extended link
214 int snd_hdac_ext_bus_link_power_down(struct hdac_ext_link *link)
216 snd_hdac_updatel(link->ml_addr, AZX_REG_ML_LCTL, AZX_MLCTL_SPA, 0);
218 return check_hdac_link_power_active(link, false);
220 EXPORT_SYMBOL_GPL(snd_hdac_ext_bus_link_power_down);
223 * snd_hdac_ext_bus_link_power_up_all -power up all hda link
224 * @ebus: HD-audio extended bus
226 int snd_hdac_ext_bus_link_power_up_all(struct hdac_bus *bus)
228 struct hdac_ext_link *hlink = NULL;
231 list_for_each_entry(hlink, &bus->hlink_list, list) {
232 snd_hdac_updatel(hlink->ml_addr, AZX_REG_ML_LCTL,
233 AZX_MLCTL_SPA, AZX_MLCTL_SPA);
234 ret = check_hdac_link_power_active(hlink, true);
241 EXPORT_SYMBOL_GPL(snd_hdac_ext_bus_link_power_up_all);
244 * snd_hdac_ext_bus_link_power_down_all -power down all hda link
245 * @ebus: HD-audio extended bus
247 int snd_hdac_ext_bus_link_power_down_all(struct hdac_bus *bus)
249 struct hdac_ext_link *hlink = NULL;
252 list_for_each_entry(hlink, &bus->hlink_list, list) {
253 snd_hdac_updatel(hlink->ml_addr, AZX_REG_ML_LCTL,
255 ret = check_hdac_link_power_active(hlink, false);
262 EXPORT_SYMBOL_GPL(snd_hdac_ext_bus_link_power_down_all);
264 int snd_hdac_ext_bus_link_get(struct hdac_bus *bus,
265 struct hdac_ext_link *link)
267 unsigned long codec_mask;
270 mutex_lock(&bus->lock);
273 * if we move from 0 to 1, count will be 1 so power up this link
274 * as well, also check the dma status and trigger that
276 if (++link->ref_count == 1) {
277 if (!bus->cmd_dma_state) {
278 snd_hdac_bus_init_cmd_io(bus);
279 bus->cmd_dma_state = true;
282 ret = snd_hdac_ext_bus_link_power_up(link);
285 * wait for 521usec for codec to report status
286 * HDA spec section 4.3 - Codec Discovery
289 codec_mask = snd_hdac_chip_readw(bus, STATESTS);
290 dev_dbg(bus->dev, "codec_mask = 0x%lx\n", codec_mask);
291 snd_hdac_chip_writew(bus, STATESTS, codec_mask);
292 if (!bus->codec_mask)
293 bus->codec_mask = codec_mask;
296 mutex_unlock(&bus->lock);
299 EXPORT_SYMBOL_GPL(snd_hdac_ext_bus_link_get);
301 int snd_hdac_ext_bus_link_put(struct hdac_bus *bus,
302 struct hdac_ext_link *link)
305 struct hdac_ext_link *hlink;
306 bool link_up = false;
308 mutex_lock(&bus->lock);
311 * if we move from 1 to 0, count will be 0
312 * so power down this link as well
314 if (--link->ref_count == 0) {
315 ret = snd_hdac_ext_bus_link_power_down(link);
318 * now check if all links are off, if so turn off
321 list_for_each_entry(hlink, &bus->hlink_list, list) {
322 if (hlink->ref_count) {
329 snd_hdac_bus_stop_cmd_io(bus);
330 bus->cmd_dma_state = false;
334 mutex_unlock(&bus->lock);
337 EXPORT_SYMBOL_GPL(snd_hdac_ext_bus_link_put);