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_ext_bus *ebus, bool enable)
44 struct hdac_bus *bus = &ebus->bus;
47 dev_err(bus->dev, "Address of PP capability is NULL");
52 snd_hdac_updatel(bus->ppcap, AZX_REG_PP_PPCTL, 0, AZX_PPCTL_GPROCEN);
54 snd_hdac_updatel(bus->ppcap, AZX_REG_PP_PPCTL, AZX_PPCTL_GPROCEN, 0);
56 EXPORT_SYMBOL_GPL(snd_hdac_ext_bus_ppcap_enable);
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
63 void snd_hdac_ext_bus_ppcap_int_enable(struct hdac_ext_bus *ebus, bool enable)
65 struct hdac_bus *bus = &ebus->bus;
68 dev_err(bus->dev, "Address of PP capability is NULL\n");
73 snd_hdac_updatel(bus->ppcap, AZX_REG_PP_PPCTL, 0, AZX_PPCTL_PIE);
75 snd_hdac_updatel(bus->ppcap, AZX_REG_PP_PPCTL, AZX_PPCTL_PIE, 0);
77 EXPORT_SYMBOL_GPL(snd_hdac_ext_bus_ppcap_int_enable);
80 * Multilink helpers - these helpers are useful for dealing with HDA
81 * new multilink capability
85 * snd_hdac_ext_bus_get_ml_capabilities - get multilink capability
86 * @ebus: HD-audio extended core bus
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
92 int snd_hdac_ext_bus_get_ml_capabilities(struct hdac_ext_bus *ebus)
96 struct hdac_ext_link *hlink;
97 struct hdac_bus *bus = &ebus->bus;
99 link_count = readl(bus->mlcap + AZX_REG_ML_MLCD) + 1;
101 dev_dbg(bus->dev, "In %s Link count: %d\n", __func__, link_count);
103 for (idx = 0; idx < link_count; idx++) {
104 hlink = kzalloc(sizeof(*hlink), GFP_KERNEL);
109 hlink->ml_addr = bus->mlcap + AZX_ML_BASE +
110 (AZX_ML_INTERVAL * idx);
111 hlink->lcaps = readl(hlink->ml_addr + AZX_REG_ML_LCAP);
112 hlink->lsdiid = readw(hlink->ml_addr + AZX_REG_ML_LSDIID);
114 /* since link in On, update the ref */
115 hlink->ref_count = 1;
117 list_add_tail(&hlink->list, &ebus->hlink_list);
122 EXPORT_SYMBOL_GPL(snd_hdac_ext_bus_get_ml_capabilities);
125 * snd_hdac_link_free_all- free hdac extended link objects
127 * @ebus: HD-audio ext core bus
130 void snd_hdac_link_free_all(struct hdac_ext_bus *ebus)
132 struct hdac_ext_link *l;
134 while (!list_empty(&ebus->hlink_list)) {
135 l = list_first_entry(&ebus->hlink_list, struct hdac_ext_link, list);
140 EXPORT_SYMBOL_GPL(snd_hdac_link_free_all);
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
147 struct hdac_ext_link *snd_hdac_ext_bus_get_link(struct hdac_ext_bus *ebus,
148 const char *codec_name)
151 struct hdac_ext_link *hlink = NULL;
154 if (sscanf(codec_name, "ehdaudio%dD%d", &bus_idx, &addr) != 2)
156 if (ebus->idx != bus_idx)
158 if (addr < 0 || addr > 31)
161 list_for_each_entry(hlink, &ebus->hlink_list, list) {
162 for (i = 0; i < HDA_MAX_CODECS; i++) {
163 if (hlink->lsdiid & (0x1 << addr))
170 EXPORT_SYMBOL_GPL(snd_hdac_ext_bus_get_link);
172 static int check_hdac_link_power_active(struct hdac_ext_link *link, bool enable)
176 int mask = (1 << AZX_MLCTL_CPA);
182 val = readl(link->ml_addr + AZX_REG_ML_LCTL);
184 if (((val & mask) >> AZX_MLCTL_CPA))
187 if (!((val & mask) >> AZX_MLCTL_CPA))
197 * snd_hdac_ext_bus_link_power_up -power up hda link
198 * @link: HD-audio extended link
200 int snd_hdac_ext_bus_link_power_up(struct hdac_ext_link *link)
202 snd_hdac_updatel(link->ml_addr, AZX_REG_ML_LCTL, 0, AZX_MLCTL_SPA);
204 return check_hdac_link_power_active(link, true);
206 EXPORT_SYMBOL_GPL(snd_hdac_ext_bus_link_power_up);
209 * snd_hdac_ext_bus_link_power_down -power down hda link
210 * @link: HD-audio extended link
212 int snd_hdac_ext_bus_link_power_down(struct hdac_ext_link *link)
214 snd_hdac_updatel(link->ml_addr, AZX_REG_ML_LCTL, AZX_MLCTL_SPA, 0);
216 return check_hdac_link_power_active(link, false);
218 EXPORT_SYMBOL_GPL(snd_hdac_ext_bus_link_power_down);
221 * snd_hdac_ext_bus_link_power_up_all -power up all hda link
222 * @ebus: HD-audio extended bus
224 int snd_hdac_ext_bus_link_power_up_all(struct hdac_ext_bus *ebus)
226 struct hdac_ext_link *hlink = NULL;
229 list_for_each_entry(hlink, &ebus->hlink_list, list) {
230 snd_hdac_updatel(hlink->ml_addr,
231 AZX_REG_ML_LCTL, 0, AZX_MLCTL_SPA);
232 ret = check_hdac_link_power_active(hlink, true);
239 EXPORT_SYMBOL_GPL(snd_hdac_ext_bus_link_power_up_all);
242 * snd_hdac_ext_bus_link_power_down_all -power down all hda link
243 * @ebus: HD-audio extended bus
245 int snd_hdac_ext_bus_link_power_down_all(struct hdac_ext_bus *ebus)
247 struct hdac_ext_link *hlink = NULL;
250 list_for_each_entry(hlink, &ebus->hlink_list, list) {
251 snd_hdac_updatel(hlink->ml_addr, AZX_REG_ML_LCTL, AZX_MLCTL_SPA, 0);
252 ret = check_hdac_link_power_active(hlink, false);
259 EXPORT_SYMBOL_GPL(snd_hdac_ext_bus_link_power_down_all);
261 int snd_hdac_ext_bus_link_get(struct hdac_ext_bus *ebus,
262 struct hdac_ext_link *link)
266 mutex_lock(&ebus->lock);
269 * if we move from 0 to 1, count will be 1 so power up this link
270 * as well, also check the dma status and trigger that
272 if (++link->ref_count == 1) {
273 if (!ebus->cmd_dma_state) {
274 snd_hdac_bus_init_cmd_io(&ebus->bus);
275 ebus->cmd_dma_state = true;
278 ret = snd_hdac_ext_bus_link_power_up(link);
281 mutex_unlock(&ebus->lock);
284 EXPORT_SYMBOL_GPL(snd_hdac_ext_bus_link_get);
286 int snd_hdac_ext_bus_link_put(struct hdac_ext_bus *ebus,
287 struct hdac_ext_link *link)
290 struct hdac_ext_link *hlink;
291 bool link_up = false;
293 mutex_lock(&ebus->lock);
296 * if we move from 1 to 0, count will be 0
297 * so power down this link as well
299 if (--link->ref_count == 0) {
300 ret = snd_hdac_ext_bus_link_power_down(link);
303 * now check if all links are off, if so turn off
306 list_for_each_entry(hlink, &ebus->hlink_list, list) {
307 if (hlink->ref_count) {
314 snd_hdac_bus_stop_cmd_io(&ebus->bus);
315 ebus->cmd_dma_state = false;
319 mutex_unlock(&ebus->lock);
322 EXPORT_SYMBOL_GPL(snd_hdac_ext_bus_link_put);