1// SPDX-License-Identifier: GPL-2.0-only
2/*
3 *  hdac-ext-controller.c - HD-audio extended controller functions.
4 *
5 *  Copyright (C) 2014-2015 Intel Corp
6 *  Author: Jeeja KP <jeeja.kp@intel.com>
7 *  ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
8 *
9 * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
10 */
11
12#include <linux/delay.h>
13#include <linux/slab.h>
14#include <sound/hda_register.h>
15#include <sound/hdaudio_ext.h>
16
17/*
18 * processing pipe helpers - these helpers are useful for dealing with HDA
19 * new capability of processing pipelines
20 */
21
22/**
23 * snd_hdac_ext_bus_ppcap_enable - enable/disable processing pipe capability
24 * @bus: the pointer to HDAC bus object
25 * @enable: flag to turn on/off the capability
26 */
27void snd_hdac_ext_bus_ppcap_enable(struct hdac_bus *bus, bool enable)
28{
29
30	if (!bus->ppcap) {
31		dev_err(bus->dev, "Address of PP capability is NULL");
32		return;
33	}
34
35	if (enable)
36		snd_hdac_updatel(bus->ppcap, AZX_REG_PP_PPCTL,
37				 AZX_PPCTL_GPROCEN, AZX_PPCTL_GPROCEN);
38	else
39		snd_hdac_updatel(bus->ppcap, AZX_REG_PP_PPCTL,
40				 AZX_PPCTL_GPROCEN, 0);
41}
42EXPORT_SYMBOL_GPL(snd_hdac_ext_bus_ppcap_enable);
43
44/**
45 * snd_hdac_ext_bus_ppcap_int_enable - ppcap interrupt enable/disable
46 * @bus: the pointer to HDAC bus object
47 * @enable: flag to enable/disable interrupt
48 */
49void snd_hdac_ext_bus_ppcap_int_enable(struct hdac_bus *bus, bool enable)
50{
51
52	if (!bus->ppcap) {
53		dev_err(bus->dev, "Address of PP capability is NULL\n");
54		return;
55	}
56
57	if (enable)
58		snd_hdac_updatel(bus->ppcap, AZX_REG_PP_PPCTL,
59				 AZX_PPCTL_PIE, AZX_PPCTL_PIE);
60	else
61		snd_hdac_updatel(bus->ppcap, AZX_REG_PP_PPCTL,
62				 AZX_PPCTL_PIE, 0);
63}
64EXPORT_SYMBOL_GPL(snd_hdac_ext_bus_ppcap_int_enable);
65
66/*
67 * Multilink helpers - these helpers are useful for dealing with HDA
68 * new multilink capability
69 */
70
71/**
72 * snd_hdac_ext_bus_get_ml_capabilities - get multilink capability
73 * @bus: the pointer to HDAC bus object
74 *
75 * This will parse all links and read the mlink capabilities and add them
76 * in hlink_list of extended hdac bus
77 * Note: this will be freed on bus exit by driver
78 */
79int snd_hdac_ext_bus_get_ml_capabilities(struct hdac_bus *bus)
80{
81	int idx;
82	u32 link_count;
83	struct hdac_ext_link *hlink;
84
85	link_count = readl(bus->mlcap + AZX_REG_ML_MLCD) + 1;
86
87	dev_dbg(bus->dev, "In %s Link count: %d\n", __func__, link_count);
88
89	for (idx = 0; idx < link_count; idx++) {
90		hlink  = kzalloc(sizeof(*hlink), GFP_KERNEL);
91		if (!hlink)
92			return -ENOMEM;
93		hlink->index = idx;
94		hlink->bus = bus;
95		hlink->ml_addr = bus->mlcap + AZX_ML_BASE +
96					(AZX_ML_INTERVAL * idx);
97		hlink->lcaps  = readl(hlink->ml_addr + AZX_REG_ML_LCAP);
98		hlink->lsdiid = readw(hlink->ml_addr + AZX_REG_ML_LSDIID);
99
100		/* since link in On, update the ref */
101		hlink->ref_count = 1;
102
103		list_add_tail(&hlink->list, &bus->hlink_list);
104	}
105
106	return 0;
107}
108EXPORT_SYMBOL_GPL(snd_hdac_ext_bus_get_ml_capabilities);
109
110/**
111 * snd_hdac_ext_link_free_all- free hdac extended link objects
112 *
113 * @bus: the pointer to HDAC bus object
114 */
115
116void snd_hdac_ext_link_free_all(struct hdac_bus *bus)
117{
118	struct hdac_ext_link *hlink;
119
120	while (!list_empty(&bus->hlink_list)) {
121		hlink = list_first_entry(&bus->hlink_list, struct hdac_ext_link, list);
122		list_del(&hlink->list);
123		kfree(hlink);
124	}
125}
126EXPORT_SYMBOL_GPL(snd_hdac_ext_link_free_all);
127
128/**
129 * snd_hdac_ext_bus_get_hlink_by_addr - get hlink at specified address
130 * @bus: hlink's parent bus device
131 * @addr: codec device address
132 *
133 * Returns hlink object or NULL if matching hlink is not found.
134 */
135struct hdac_ext_link *snd_hdac_ext_bus_get_hlink_by_addr(struct hdac_bus *bus, int addr)
136{
137	struct hdac_ext_link *hlink;
138
139	list_for_each_entry(hlink, &bus->hlink_list, list)
140		if (hlink->lsdiid & (0x1 << addr))
141			return hlink;
142	return NULL;
143}
144EXPORT_SYMBOL_GPL(snd_hdac_ext_bus_get_hlink_by_addr);
145
146/**
147 * snd_hdac_ext_bus_get_hlink_by_name - get hlink based on codec name
148 * @bus: the pointer to HDAC bus object
149 * @codec_name: codec name
150 */
151struct hdac_ext_link *snd_hdac_ext_bus_get_hlink_by_name(struct hdac_bus *bus,
152							 const char *codec_name)
153{
154	int bus_idx, addr;
155
156	if (sscanf(codec_name, "ehdaudio%dD%d", &bus_idx, &addr) != 2)
157		return NULL;
158	if (bus->idx != bus_idx)
159		return NULL;
160	if (addr < 0 || addr > 31)
161		return NULL;
162
163	return snd_hdac_ext_bus_get_hlink_by_addr(bus, addr);
164}
165EXPORT_SYMBOL_GPL(snd_hdac_ext_bus_get_hlink_by_name);
166
167static int check_hdac_link_power_active(struct hdac_ext_link *hlink, bool enable)
168{
169	int timeout;
170	u32 val;
171	int mask = (1 << AZX_ML_LCTL_CPA_SHIFT);
172
173	udelay(3);
174	timeout = 150;
175
176	do {
177		val = readl(hlink->ml_addr + AZX_REG_ML_LCTL);
178		if (enable) {
179			if (((val & mask) >> AZX_ML_LCTL_CPA_SHIFT))
180				return 0;
181		} else {
182			if (!((val & mask) >> AZX_ML_LCTL_CPA_SHIFT))
183				return 0;
184		}
185		udelay(3);
186	} while (--timeout);
187
188	return -EIO;
189}
190
191/**
192 * snd_hdac_ext_bus_link_power_up -power up hda link
193 * @hlink: HD-audio extended link
194 */
195int snd_hdac_ext_bus_link_power_up(struct hdac_ext_link *hlink)
196{
197	snd_hdac_updatel(hlink->ml_addr, AZX_REG_ML_LCTL,
198			 AZX_ML_LCTL_SPA, AZX_ML_LCTL_SPA);
199
200	return check_hdac_link_power_active(hlink, true);
201}
202EXPORT_SYMBOL_GPL(snd_hdac_ext_bus_link_power_up);
203
204/**
205 * snd_hdac_ext_bus_link_power_down -power down hda link
206 * @hlink: HD-audio extended link
207 */
208int snd_hdac_ext_bus_link_power_down(struct hdac_ext_link *hlink)
209{
210	snd_hdac_updatel(hlink->ml_addr, AZX_REG_ML_LCTL, AZX_ML_LCTL_SPA, 0);
211
212	return check_hdac_link_power_active(hlink, false);
213}
214EXPORT_SYMBOL_GPL(snd_hdac_ext_bus_link_power_down);
215
216/**
217 * snd_hdac_ext_bus_link_power_up_all -power up all hda link
218 * @bus: the pointer to HDAC bus object
219 */
220int snd_hdac_ext_bus_link_power_up_all(struct hdac_bus *bus)
221{
222	struct hdac_ext_link *hlink = NULL;
223	int ret;
224
225	list_for_each_entry(hlink, &bus->hlink_list, list) {
226		ret = snd_hdac_ext_bus_link_power_up(hlink);
227		if (ret < 0)
228			return ret;
229	}
230
231	return 0;
232}
233EXPORT_SYMBOL_GPL(snd_hdac_ext_bus_link_power_up_all);
234
235/**
236 * snd_hdac_ext_bus_link_power_down_all -power down all hda link
237 * @bus: the pointer to HDAC bus object
238 */
239int snd_hdac_ext_bus_link_power_down_all(struct hdac_bus *bus)
240{
241	struct hdac_ext_link *hlink = NULL;
242	int ret;
243
244	list_for_each_entry(hlink, &bus->hlink_list, list) {
245		ret = snd_hdac_ext_bus_link_power_down(hlink);
246		if (ret < 0)
247			return ret;
248	}
249
250	return 0;
251}
252EXPORT_SYMBOL_GPL(snd_hdac_ext_bus_link_power_down_all);
253
254/**
255 * snd_hdac_ext_bus_link_set_stream_id - maps stream id to link output
256 * @link: HD-audio ext link to set up
257 * @stream: stream id
258 */
259void snd_hdac_ext_bus_link_set_stream_id(struct hdac_ext_link *link,
260					 int stream)
261{
262	snd_hdac_updatew(link->ml_addr, AZX_REG_ML_LOSIDV, (1 << stream), 1 << stream);
263}
264EXPORT_SYMBOL_GPL(snd_hdac_ext_bus_link_set_stream_id);
265
266/**
267 * snd_hdac_ext_bus_link_clear_stream_id - maps stream id to link output
268 * @link: HD-audio ext link to set up
269 * @stream: stream id
270 */
271void snd_hdac_ext_bus_link_clear_stream_id(struct hdac_ext_link *link,
272					   int stream)
273{
274	snd_hdac_updatew(link->ml_addr, AZX_REG_ML_LOSIDV, (1 << stream), 0);
275}
276EXPORT_SYMBOL_GPL(snd_hdac_ext_bus_link_clear_stream_id);
277
278int snd_hdac_ext_bus_link_get(struct hdac_bus *bus,
279				struct hdac_ext_link *hlink)
280{
281	unsigned long codec_mask;
282	int ret = 0;
283
284	mutex_lock(&bus->lock);
285
286	/*
287	 * if we move from 0 to 1, count will be 1 so power up this link
288	 * as well, also check the dma status and trigger that
289	 */
290	if (++hlink->ref_count == 1) {
291		if (!bus->cmd_dma_state) {
292			snd_hdac_bus_init_cmd_io(bus);
293			bus->cmd_dma_state = true;
294		}
295
296		ret = snd_hdac_ext_bus_link_power_up(hlink);
297
298		/*
299		 * clear the register to invalidate all the output streams
300		 */
301		snd_hdac_updatew(hlink->ml_addr, AZX_REG_ML_LOSIDV,
302				 AZX_ML_LOSIDV_STREAM_MASK, 0);
303		/*
304		 *  wait for 521usec for codec to report status
305		 *  HDA spec section 4.3 - Codec Discovery
306		 */
307		udelay(521);
308		codec_mask = snd_hdac_chip_readw(bus, STATESTS);
309		dev_dbg(bus->dev, "codec_mask = 0x%lx\n", codec_mask);
310		snd_hdac_chip_writew(bus, STATESTS, codec_mask);
311		if (!bus->codec_mask)
312			bus->codec_mask = codec_mask;
313	}
314
315	mutex_unlock(&bus->lock);
316	return ret;
317}
318EXPORT_SYMBOL_GPL(snd_hdac_ext_bus_link_get);
319
320int snd_hdac_ext_bus_link_put(struct hdac_bus *bus,
321			      struct hdac_ext_link *hlink)
322{
323	int ret = 0;
324	struct hdac_ext_link *hlink_tmp;
325	bool link_up = false;
326
327	mutex_lock(&bus->lock);
328
329	/*
330	 * if we move from 1 to 0, count will be 0
331	 * so power down this link as well
332	 */
333	if (--hlink->ref_count == 0) {
334		ret = snd_hdac_ext_bus_link_power_down(hlink);
335
336		/*
337		 * now check if all links are off, if so turn off
338		 * cmd dma as well
339		 */
340		list_for_each_entry(hlink_tmp, &bus->hlink_list, list) {
341			if (hlink_tmp->ref_count) {
342				link_up = true;
343				break;
344			}
345		}
346
347		if (!link_up) {
348			snd_hdac_bus_stop_cmd_io(bus);
349			bus->cmd_dma_state = false;
350		}
351	}
352
353	mutex_unlock(&bus->lock);
354	return ret;
355}
356EXPORT_SYMBOL_GPL(snd_hdac_ext_bus_link_put);
357
358static void hdac_ext_codec_link_up(struct hdac_device *codec)
359{
360	const char *devname = dev_name(&codec->dev);
361	struct hdac_ext_link *hlink =
362		snd_hdac_ext_bus_get_hlink_by_name(codec->bus, devname);
363
364	if (hlink)
365		snd_hdac_ext_bus_link_get(codec->bus, hlink);
366}
367
368static void hdac_ext_codec_link_down(struct hdac_device *codec)
369{
370	const char *devname = dev_name(&codec->dev);
371	struct hdac_ext_link *hlink =
372		snd_hdac_ext_bus_get_hlink_by_name(codec->bus, devname);
373
374	if (hlink)
375		snd_hdac_ext_bus_link_put(codec->bus, hlink);
376}
377
378void snd_hdac_ext_bus_link_power(struct hdac_device *codec, bool enable)
379{
380	struct hdac_bus *bus = codec->bus;
381	bool oldstate = test_bit(codec->addr, &bus->codec_powered);
382
383	if (enable == oldstate)
384		return;
385
386	snd_hdac_bus_link_power(codec, enable);
387
388	if (enable)
389		hdac_ext_codec_link_up(codec);
390	else
391		hdac_ext_codec_link_down(codec);
392}
393EXPORT_SYMBOL_GPL(snd_hdac_ext_bus_link_power);
394