vmalloc: fix __GFP_HIGHMEM usage for vmalloc_32 on 32b systems
[linux/fpc-iii.git] / sound / hda / ext / hdac_ext_controller.c
blob84f3b81687164d419b4cff063011d774790273f3
1 /*
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
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
42 void snd_hdac_ext_bus_ppcap_enable(struct hdac_ext_bus *ebus, bool enable)
44 struct hdac_bus *bus = &ebus->bus;
46 if (!bus->ppcap) {
47 dev_err(bus->dev, "Address of PP capability is NULL");
48 return;
51 if (enable)
52 snd_hdac_updatel(bus->ppcap, AZX_REG_PP_PPCTL, 0, AZX_PPCTL_GPROCEN);
53 else
54 snd_hdac_updatel(bus->ppcap, AZX_REG_PP_PPCTL, AZX_PPCTL_GPROCEN, 0);
56 EXPORT_SYMBOL_GPL(snd_hdac_ext_bus_ppcap_enable);
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
63 void snd_hdac_ext_bus_ppcap_int_enable(struct hdac_ext_bus *ebus, bool enable)
65 struct hdac_bus *bus = &ebus->bus;
67 if (!bus->ppcap) {
68 dev_err(bus->dev, "Address of PP capability is NULL\n");
69 return;
72 if (enable)
73 snd_hdac_updatel(bus->ppcap, AZX_REG_PP_PPCTL, 0, AZX_PPCTL_PIE);
74 else
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
84 /**
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)
94 int idx;
95 u32 link_count;
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);
105 if (!hlink)
106 return -ENOMEM;
107 hlink->index = idx;
108 hlink->bus = bus;
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);
120 return 0;
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);
136 list_del(&l->list);
137 kfree(l);
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)
150 int i;
151 struct hdac_ext_link *hlink = NULL;
152 int bus_idx, addr;
154 if (sscanf(codec_name, "ehdaudio%dD%d", &bus_idx, &addr) != 2)
155 return NULL;
156 if (ebus->idx != bus_idx)
157 return NULL;
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;
166 return NULL;
168 EXPORT_SYMBOL_GPL(snd_hdac_ext_bus_get_link);
170 static int check_hdac_link_power_active(struct hdac_ext_link *link, bool enable)
172 int timeout;
173 u32 val;
174 int mask = (1 << AZX_MLCTL_CPA_SHIFT);
176 udelay(3);
177 timeout = 150;
179 do {
180 val = readl(link->ml_addr + AZX_REG_ML_LCTL);
181 if (enable) {
182 if (((val & mask) >> AZX_MLCTL_CPA_SHIFT))
183 return 0;
184 } else {
185 if (!((val & mask) >> AZX_MLCTL_CPA_SHIFT))
186 return 0;
188 udelay(3);
189 } while (--timeout);
191 return -EIO;
195 * snd_hdac_ext_bus_link_power_up -power up hda link
196 * @link: HD-audio extended link
198 int snd_hdac_ext_bus_link_power_up(struct hdac_ext_link *link)
200 snd_hdac_updatel(link->ml_addr, AZX_REG_ML_LCTL, 0, AZX_MLCTL_SPA);
202 return check_hdac_link_power_active(link, true);
204 EXPORT_SYMBOL_GPL(snd_hdac_ext_bus_link_power_up);
207 * snd_hdac_ext_bus_link_power_down -power down hda link
208 * @link: HD-audio extended link
210 int snd_hdac_ext_bus_link_power_down(struct hdac_ext_link *link)
212 snd_hdac_updatel(link->ml_addr, AZX_REG_ML_LCTL, AZX_MLCTL_SPA, 0);
214 return check_hdac_link_power_active(link, false);
216 EXPORT_SYMBOL_GPL(snd_hdac_ext_bus_link_power_down);
219 * snd_hdac_ext_bus_link_power_up_all -power up all hda link
220 * @ebus: HD-audio extended bus
222 int snd_hdac_ext_bus_link_power_up_all(struct hdac_ext_bus *ebus)
224 struct hdac_ext_link *hlink = NULL;
225 int ret;
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;
235 return 0;
237 EXPORT_SYMBOL_GPL(snd_hdac_ext_bus_link_power_up_all);
240 * snd_hdac_ext_bus_link_power_down_all -power down all hda link
241 * @ebus: HD-audio extended bus
243 int snd_hdac_ext_bus_link_power_down_all(struct hdac_ext_bus *ebus)
245 struct hdac_ext_link *hlink = NULL;
246 int ret;
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;
255 return 0;
257 EXPORT_SYMBOL_GPL(snd_hdac_ext_bus_link_power_down_all);
259 int snd_hdac_ext_bus_link_get(struct hdac_ext_bus *ebus,
260 struct hdac_ext_link *link)
262 int ret = 0;
264 mutex_lock(&ebus->lock);
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
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;
276 ret = snd_hdac_ext_bus_link_power_up(link);
279 mutex_unlock(&ebus->lock);
280 return ret;
282 EXPORT_SYMBOL_GPL(snd_hdac_ext_bus_link_get);
284 int snd_hdac_ext_bus_link_put(struct hdac_ext_bus *ebus,
285 struct hdac_ext_link *link)
287 int ret = 0;
288 struct hdac_ext_link *hlink;
289 bool link_up = false;
291 mutex_lock(&ebus->lock);
294 * if we move from 1 to 0, count will be 0
295 * so power down this link as well
297 if (--link->ref_count == 0) {
298 ret = snd_hdac_ext_bus_link_power_down(link);
301 * now check if all links are off, if so turn off
302 * cmd dma as well
304 list_for_each_entry(hlink, &ebus->hlink_list, list) {
305 if (hlink->ref_count) {
306 link_up = true;
307 break;
311 if (!link_up) {
312 snd_hdac_bus_stop_cmd_io(&ebus->bus);
313 ebus->cmd_dma_state = false;
317 mutex_unlock(&ebus->lock);
318 return ret;
320 EXPORT_SYMBOL_GPL(snd_hdac_ext_bus_link_put);