1/*
  2 * Copyright 2008 Advanced Micro Devices, Inc.
  3 * Copyright 2008 Red Hat Inc.
  4 * Copyright 2009 Christian König.
  5 *
  6 * Permission is hereby granted, free of charge, to any person obtaining a
  7 * copy of this software and associated documentation files (the "Software"),
  8 * to deal in the Software without restriction, including without limitation
  9 * the rights to use, copy, modify, merge, publish, distribute, sublicense,
 10 * and/or sell copies of the Software, and to permit persons to whom the
 11 * Software is furnished to do so, subject to the following conditions:
 12 *
 13 * The above copyright notice and this permission notice shall be included in
 14 * all copies or substantial portions of the Software.
 15 *
 16 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 17 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 18 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
 19 * THE COPYRIGHT HOLDER(S) OR AUTHOR(S) BE LIABLE FOR ANY CLAIM, DAMAGES OR
 20 * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
 21 * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
 22 * OTHER DEALINGS IN THE SOFTWARE.
 23 *
 24 * Authors: Christian König
 25 */
 26#include "drmP.h"
 27#include "radeon.h"
 28#include "radeon_reg.h"
 29#include "radeon_asic.h"
 30#include "atom.h"
 31
 32#define AUDIO_TIMER_INTERVALL 100 /* 1/10 sekund should be enough */
 33
 34/*
 35 * check if the chipset is supported
 36 */
 37static int r600_audio_chipset_supported(struct radeon_device *rdev)
 38{
 39	return (rdev->family >= CHIP_R600 && rdev->family < CHIP_CEDAR)
 40		|| rdev->family == CHIP_RS600
 41		|| rdev->family == CHIP_RS690
 42		|| rdev->family == CHIP_RS740;
 43}
 44
 45/*
 46 * current number of channels
 47 */
 48int r600_audio_channels(struct radeon_device *rdev)
 49{
 50	return (RREG32(R600_AUDIO_RATE_BPS_CHANNEL) & 0x7) + 1;
 51}
 52
 53/*
 54 * current bits per sample
 55 */
 56int r600_audio_bits_per_sample(struct radeon_device *rdev)
 57{
 58	uint32_t value = (RREG32(R600_AUDIO_RATE_BPS_CHANNEL) & 0xF0) >> 4;
 59	switch (value) {
 60	case 0x0: return  8;
 61	case 0x1: return 16;
 62	case 0x2: return 20;
 63	case 0x3: return 24;
 64	case 0x4: return 32;
 65	}
 66
 67	dev_err(rdev->dev, "Unknown bits per sample 0x%x using 16 instead\n",
 68		(int)value);
 69
 70	return 16;
 71}
 72
 73/*
 74 * current sampling rate in HZ
 75 */
 76int r600_audio_rate(struct radeon_device *rdev)
 77{
 78	uint32_t value = RREG32(R600_AUDIO_RATE_BPS_CHANNEL);
 79	uint32_t result;
 80
 81	if (value & 0x4000)
 82		result = 44100;
 83	else
 84		result = 48000;
 85
 86	result *= ((value >> 11) & 0x7) + 1;
 87	result /= ((value >> 8) & 0x7) + 1;
 88
 89	return result;
 90}
 91
 92/*
 93 * iec 60958 status bits
 94 */
 95uint8_t r600_audio_status_bits(struct radeon_device *rdev)
 96{
 97	return RREG32(R600_AUDIO_STATUS_BITS) & 0xff;
 98}
 99
100/*
101 * iec 60958 category code
102 */
103uint8_t r600_audio_category_code(struct radeon_device *rdev)
104{
105	return (RREG32(R600_AUDIO_STATUS_BITS) >> 8) & 0xff;
106}
107
108/*
109 * schedule next audio update event
110 */
111void r600_audio_schedule_polling(struct radeon_device *rdev)
112{
113	mod_timer(&rdev->audio_timer,
114		jiffies + msecs_to_jiffies(AUDIO_TIMER_INTERVALL));
115}
116
117/*
118 * update all hdmi interfaces with current audio parameters
119 */
120static void r600_audio_update_hdmi(unsigned long param)
121{
122	struct radeon_device *rdev = (struct radeon_device *)param;
123	struct drm_device *dev = rdev->ddev;
124
125	int channels = r600_audio_channels(rdev);
126	int rate = r600_audio_rate(rdev);
127	int bps = r600_audio_bits_per_sample(rdev);
128	uint8_t status_bits = r600_audio_status_bits(rdev);
129	uint8_t category_code = r600_audio_category_code(rdev);
130
131	struct drm_encoder *encoder;
132	int changes = 0, still_going = 0;
133
134	changes |= channels != rdev->audio_channels;
135	changes |= rate != rdev->audio_rate;
136	changes |= bps != rdev->audio_bits_per_sample;
137	changes |= status_bits != rdev->audio_status_bits;
138	changes |= category_code != rdev->audio_category_code;
139
140	if (changes) {
141		rdev->audio_channels = channels;
142		rdev->audio_rate = rate;
143		rdev->audio_bits_per_sample = bps;
144		rdev->audio_status_bits = status_bits;
145		rdev->audio_category_code = category_code;
146	}
147
148	list_for_each_entry(encoder, &dev->mode_config.encoder_list, head) {
149		struct radeon_encoder *radeon_encoder = to_radeon_encoder(encoder);
150		still_going |= radeon_encoder->audio_polling_active;
151		if (changes || r600_hdmi_buffer_status_changed(encoder))
152			r600_hdmi_update_audio_settings(encoder);
153	}
154
155	if (still_going)
156		r600_audio_schedule_polling(rdev);
157}
158
159/*
160 * turn on/off audio engine
161 */
162static void r600_audio_engine_enable(struct radeon_device *rdev, bool enable)
163{
164	DRM_INFO("%s audio support\n", enable ? "Enabling" : "Disabling");
165	WREG32_P(R600_AUDIO_ENABLE, enable ? 0x81000000 : 0x0, ~0x81000000);
166	rdev->audio_enabled = enable;
167}
168
169/*
170 * initialize the audio vars and register the update timer
171 */
172int r600_audio_init(struct radeon_device *rdev)
173{
174	if (!radeon_audio || !r600_audio_chipset_supported(rdev))
175		return 0;
176
177	r600_audio_engine_enable(rdev, true);
178
179	rdev->audio_channels = -1;
180	rdev->audio_rate = -1;
181	rdev->audio_bits_per_sample = -1;
182	rdev->audio_status_bits = 0;
183	rdev->audio_category_code = 0;
184
185	setup_timer(
186		&rdev->audio_timer,
187		r600_audio_update_hdmi,
188		(unsigned long)rdev);
189
190	return 0;
191}
192
193/*
194 * enable the polling timer, to check for status changes
195 */
196void r600_audio_enable_polling(struct drm_encoder *encoder)
197{
198	struct drm_device *dev = encoder->dev;
199	struct radeon_device *rdev = dev->dev_private;
200	struct radeon_encoder *radeon_encoder = to_radeon_encoder(encoder);
201
202	DRM_DEBUG("r600_audio_enable_polling: %d\n",
203		radeon_encoder->audio_polling_active);
204	if (radeon_encoder->audio_polling_active)
205		return;
206
207	radeon_encoder->audio_polling_active = 1;
208	if (rdev->audio_enabled)
209		mod_timer(&rdev->audio_timer, jiffies + 1);
210}
211
212/*
213 * disable the polling timer, so we get no more status updates
214 */
215void r600_audio_disable_polling(struct drm_encoder *encoder)
216{
217	struct radeon_encoder *radeon_encoder = to_radeon_encoder(encoder);
218	DRM_DEBUG("r600_audio_disable_polling: %d\n",
219		radeon_encoder->audio_polling_active);
220	radeon_encoder->audio_polling_active = 0;
221}
222
223/*
224 * atach the audio codec to the clock source of the encoder
225 */
226void r600_audio_set_clock(struct drm_encoder *encoder, int clock)
227{
228	struct drm_device *dev = encoder->dev;
229	struct radeon_device *rdev = dev->dev_private;
230	struct radeon_encoder *radeon_encoder = to_radeon_encoder(encoder);
231	struct radeon_encoder_atom_dig *dig = radeon_encoder->enc_priv;
232	int base_rate = 48000;
233
234	switch (radeon_encoder->encoder_id) {
235	case ENCODER_OBJECT_ID_INTERNAL_KLDSCP_TMDS1:
236	case ENCODER_OBJECT_ID_INTERNAL_LVTM1:
237		WREG32_P(R600_AUDIO_TIMING, 0, ~0x301);
238		break;
239	case ENCODER_OBJECT_ID_INTERNAL_UNIPHY:
240	case ENCODER_OBJECT_ID_INTERNAL_UNIPHY1:
241	case ENCODER_OBJECT_ID_INTERNAL_UNIPHY2:
242	case ENCODER_OBJECT_ID_INTERNAL_KLDSCP_LVTMA:
243		WREG32_P(R600_AUDIO_TIMING, 0x100, ~0x301);
244		break;
245	default:
246		dev_err(rdev->dev, "Unsupported encoder type 0x%02X\n",
247			  radeon_encoder->encoder_id);
248		return;
249	}
250
251	switch (dig->dig_encoder) {
252	case 0:
253		WREG32(R600_AUDIO_PLL1_MUL, base_rate * 50);
254		WREG32(R600_AUDIO_PLL1_DIV, clock * 100);
255		WREG32(R600_AUDIO_CLK_SRCSEL, 0);
256		break;
257
258	case 1:
259		WREG32(R600_AUDIO_PLL2_MUL, base_rate * 50);
260		WREG32(R600_AUDIO_PLL2_DIV, clock * 100);
261		WREG32(R600_AUDIO_CLK_SRCSEL, 1);
262		break;
263	default:
264		dev_err(rdev->dev, "Unsupported DIG on encoder 0x%02X\n",
265			  radeon_encoder->encoder_id);
266		return;
267	}
268}
269
270/*
271 * release the audio timer
272 * TODO: How to do this correctly on SMP systems?
273 */
274void r600_audio_fini(struct radeon_device *rdev)
275{
276	if (!rdev->audio_enabled)
277		return;
278
279	del_timer(&rdev->audio_timer);
280
281	r600_audio_engine_enable(rdev, false);
282}