1// SPDX-License-Identifier: (GPL-2.0-only OR BSD-3-Clause)
2//
3// This file is provided under a dual BSD/GPLv2 license. When using or
4// redistributing this file, you may do so under either license.
5//
6// Copyright(c) 2021 Advanced Micro Devices, Inc.
7//
8// Authors: Ajit Kumar Pandey <AjitKumar.Pandey@amd.com>
9
10/*
11 * Generic interface for ACP audio blck PCM component
12 */
13
14#include <linux/platform_device.h>
15#include <linux/module.h>
16#include <linux/err.h>
17#include <linux/io.h>
18#include <sound/pcm_params.h>
19#include <sound/soc.h>
20#include <sound/soc-dai.h>
21#include <linux/dma-mapping.h>
22
23#include "amd.h"
24#include "../mach-config.h"
25#include "acp-mach.h"
26
27#define DRV_NAME "acp_i2s_dma"
28
29static const struct snd_pcm_hardware acp_pcm_hardware_playback = {
30	.info = SNDRV_PCM_INFO_INTERLEAVED |
31		SNDRV_PCM_INFO_BLOCK_TRANSFER |
32		SNDRV_PCM_INFO_BATCH |
33		SNDRV_PCM_INFO_MMAP | SNDRV_PCM_INFO_MMAP_VALID |
34		SNDRV_PCM_INFO_PAUSE | SNDRV_PCM_INFO_RESUME,
35	.formats = SNDRV_PCM_FMTBIT_S16_LE |  SNDRV_PCM_FMTBIT_S8 |
36		   SNDRV_PCM_FMTBIT_U8 | SNDRV_PCM_FMTBIT_S24_LE |
37		   SNDRV_PCM_FMTBIT_S32_LE,
38	.channels_min = 2,
39	.channels_max = 8,
40	.rates = SNDRV_PCM_RATE_8000_96000,
41	.rate_min = 8000,
42	.rate_max = 96000,
43	.buffer_bytes_max = PLAYBACK_MAX_NUM_PERIODS * PLAYBACK_MAX_PERIOD_SIZE,
44	.period_bytes_min = PLAYBACK_MIN_PERIOD_SIZE,
45	.period_bytes_max = PLAYBACK_MAX_PERIOD_SIZE,
46	.periods_min = PLAYBACK_MIN_NUM_PERIODS,
47	.periods_max = PLAYBACK_MAX_NUM_PERIODS,
48};
49
50static const struct snd_pcm_hardware acp_pcm_hardware_capture = {
51	.info = SNDRV_PCM_INFO_INTERLEAVED |
52		SNDRV_PCM_INFO_BLOCK_TRANSFER |
53		SNDRV_PCM_INFO_BATCH |
54		SNDRV_PCM_INFO_MMAP | SNDRV_PCM_INFO_MMAP_VALID |
55		SNDRV_PCM_INFO_PAUSE | SNDRV_PCM_INFO_RESUME,
56	.formats = SNDRV_PCM_FMTBIT_S16_LE | SNDRV_PCM_FMTBIT_S8 |
57		   SNDRV_PCM_FMTBIT_U8 | SNDRV_PCM_FMTBIT_S24_LE |
58		   SNDRV_PCM_FMTBIT_S32_LE,
59	.channels_min = 2,
60	.channels_max = 2,
61	.rates = SNDRV_PCM_RATE_8000_48000,
62	.rate_min = 8000,
63	.rate_max = 48000,
64	.buffer_bytes_max = CAPTURE_MAX_NUM_PERIODS * CAPTURE_MAX_PERIOD_SIZE,
65	.period_bytes_min = CAPTURE_MIN_PERIOD_SIZE,
66	.period_bytes_max = CAPTURE_MAX_PERIOD_SIZE,
67	.periods_min = CAPTURE_MIN_NUM_PERIODS,
68	.periods_max = CAPTURE_MAX_NUM_PERIODS,
69};
70
71int acp_machine_select(struct acp_dev_data *adata)
72{
73	struct snd_soc_acpi_mach *mach;
74	int size, platform;
75
76	if (adata->flag == FLAG_AMD_LEGACY_ONLY_DMIC) {
77		platform = adata->platform;
78		adata->mach_dev = platform_device_register_data(adata->dev, "acp-pdm-mach",
79								PLATFORM_DEVID_NONE, &platform,
80								sizeof(platform));
81	} else {
82		size = sizeof(*adata->machines);
83		mach = snd_soc_acpi_find_machine(adata->machines);
84		if (!mach) {
85			dev_err(adata->dev, "warning: No matching ASoC machine driver found\n");
86			return -EINVAL;
87		}
88		adata->mach_dev = platform_device_register_data(adata->dev, mach->drv_name,
89								PLATFORM_DEVID_NONE, mach, size);
90	}
91	if (IS_ERR(adata->mach_dev))
92		dev_warn(adata->dev, "Unable to register Machine device\n");
93	return 0;
94}
95EXPORT_SYMBOL_NS_GPL(acp_machine_select, SND_SOC_ACP_COMMON);
96
97static irqreturn_t i2s_irq_handler(int irq, void *data)
98{
99	struct acp_dev_data *adata = data;
100	struct acp_resource *rsrc = adata->rsrc;
101	struct acp_stream *stream;
102	u16 i2s_flag = 0;
103	u32 ext_intr_stat, ext_intr_stat1;
104
105	if (!adata)
106		return IRQ_NONE;
107
108	if (adata->rsrc->no_of_ctrls == 2)
109		ext_intr_stat1 = readl(ACP_EXTERNAL_INTR_STAT(adata, (rsrc->irqp_used - 1)));
110
111	ext_intr_stat = readl(ACP_EXTERNAL_INTR_STAT(adata, rsrc->irqp_used));
112
113	spin_lock(&adata->acp_lock);
114	list_for_each_entry(stream, &adata->stream_list, list) {
115		if (ext_intr_stat & stream->irq_bit) {
116			writel(stream->irq_bit,
117			       ACP_EXTERNAL_INTR_STAT(adata, rsrc->irqp_used));
118			snd_pcm_period_elapsed(stream->substream);
119			i2s_flag = 1;
120		}
121		if (adata->rsrc->no_of_ctrls == 2) {
122			if (ext_intr_stat1 & stream->irq_bit) {
123				writel(stream->irq_bit, ACP_EXTERNAL_INTR_STAT(adata,
124				       (rsrc->irqp_used - 1)));
125				snd_pcm_period_elapsed(stream->substream);
126				i2s_flag = 1;
127			}
128		}
129	}
130	spin_unlock(&adata->acp_lock);
131	if (i2s_flag)
132		return IRQ_HANDLED;
133
134	return IRQ_NONE;
135}
136
137void config_pte_for_stream(struct acp_dev_data *adata, struct acp_stream *stream)
138{
139	struct acp_resource *rsrc = adata->rsrc;
140	u32 pte_reg, pte_size, reg_val;
141
142	/* Use ATU base Group5 */
143	pte_reg = ACPAXI2AXI_ATU_BASE_ADDR_GRP_5;
144	pte_size =  ACPAXI2AXI_ATU_PAGE_SIZE_GRP_5;
145	stream->reg_offset = 0x02000000;
146
147	/* Group Enable */
148	reg_val = rsrc->sram_pte_offset;
149	writel(reg_val | BIT(31), adata->acp_base + pte_reg);
150	writel(PAGE_SIZE_4K_ENABLE,  adata->acp_base + pte_size);
151	writel(0x01, adata->acp_base + ACPAXI2AXI_ATU_CTRL);
152}
153EXPORT_SYMBOL_NS_GPL(config_pte_for_stream, SND_SOC_ACP_COMMON);
154
155void config_acp_dma(struct acp_dev_data *adata, struct acp_stream *stream, int size)
156{
157	struct snd_pcm_substream *substream = stream->substream;
158	struct acp_resource *rsrc = adata->rsrc;
159	dma_addr_t addr = substream->dma_buffer.addr;
160	int num_pages = (PAGE_ALIGN(size) >> PAGE_SHIFT);
161	u32 low, high, val;
162	u16 page_idx;
163
164	val = stream->pte_offset;
165
166	for (page_idx = 0; page_idx < num_pages; page_idx++) {
167		/* Load the low address of page int ACP SRAM through SRBM */
168		low = lower_32_bits(addr);
169		high = upper_32_bits(addr);
170		writel(low, adata->acp_base + rsrc->scratch_reg_offset + val);
171		high |= BIT(31);
172		writel(high, adata->acp_base + rsrc->scratch_reg_offset + val + 4);
173
174		/* Move to next physically contiguous page */
175		val += 8;
176		addr += PAGE_SIZE;
177	}
178}
179EXPORT_SYMBOL_NS_GPL(config_acp_dma, SND_SOC_ACP_COMMON);
180
181static int acp_dma_open(struct snd_soc_component *component, struct snd_pcm_substream *substream)
182{
183	struct snd_pcm_runtime *runtime = substream->runtime;
184	struct device *dev = component->dev;
185	struct acp_dev_data *adata = dev_get_drvdata(dev);
186	struct acp_stream *stream;
187	int ret;
188
189	stream = kzalloc(sizeof(*stream), GFP_KERNEL);
190	if (!stream)
191		return -ENOMEM;
192
193	stream->substream = substream;
194
195	if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
196		runtime->hw = acp_pcm_hardware_playback;
197	else
198		runtime->hw = acp_pcm_hardware_capture;
199
200	ret = snd_pcm_hw_constraint_integer(runtime, SNDRV_PCM_HW_PARAM_PERIODS);
201	if (ret < 0) {
202		dev_err(component->dev, "set integer constraint failed\n");
203		kfree(stream);
204		return ret;
205	}
206	runtime->private_data = stream;
207
208	writel(1, ACP_EXTERNAL_INTR_ENB(adata));
209
210	spin_lock_irq(&adata->acp_lock);
211	list_add_tail(&stream->list, &adata->stream_list);
212	spin_unlock_irq(&adata->acp_lock);
213
214	return ret;
215}
216
217static int acp_dma_hw_params(struct snd_soc_component *component,
218			     struct snd_pcm_substream *substream,
219			     struct snd_pcm_hw_params *params)
220{
221	struct acp_dev_data *adata = snd_soc_component_get_drvdata(component);
222	struct acp_stream *stream = substream->runtime->private_data;
223	u64 size = params_buffer_bytes(params);
224
225	/* Configure ACP DMA block with params */
226	config_pte_for_stream(adata, stream);
227	config_acp_dma(adata, stream, size);
228
229	return 0;
230}
231
232static snd_pcm_uframes_t acp_dma_pointer(struct snd_soc_component *component,
233					 struct snd_pcm_substream *substream)
234{
235	struct device *dev = component->dev;
236	struct acp_dev_data *adata = dev_get_drvdata(dev);
237	struct acp_stream *stream = substream->runtime->private_data;
238	u32 pos, buffersize;
239	u64 bytescount;
240
241	buffersize = frames_to_bytes(substream->runtime,
242				     substream->runtime->buffer_size);
243
244	bytescount = acp_get_byte_count(adata, stream->dai_id, substream->stream);
245
246	if (bytescount > stream->bytescount)
247		bytescount -= stream->bytescount;
248
249	pos = do_div(bytescount, buffersize);
250
251	return bytes_to_frames(substream->runtime, pos);
252}
253
254static int acp_dma_new(struct snd_soc_component *component,
255		       struct snd_soc_pcm_runtime *rtd)
256{
257	struct device *parent = component->dev->parent;
258
259	snd_pcm_set_managed_buffer_all(rtd->pcm, SNDRV_DMA_TYPE_DEV,
260				       parent, MIN_BUFFER, MAX_BUFFER);
261	return 0;
262}
263
264static int acp_dma_close(struct snd_soc_component *component,
265			 struct snd_pcm_substream *substream)
266{
267	struct device *dev = component->dev;
268	struct acp_dev_data *adata = dev_get_drvdata(dev);
269	struct acp_stream *stream = substream->runtime->private_data;
270
271	/* Remove entry from list */
272	spin_lock_irq(&adata->acp_lock);
273	list_del(&stream->list);
274	spin_unlock_irq(&adata->acp_lock);
275	kfree(stream);
276
277	return 0;
278}
279
280static const struct snd_soc_component_driver acp_pcm_component = {
281	.name			= DRV_NAME,
282	.open			= acp_dma_open,
283	.close			= acp_dma_close,
284	.hw_params		= acp_dma_hw_params,
285	.pointer		= acp_dma_pointer,
286	.pcm_construct		= acp_dma_new,
287	.legacy_dai_naming	= 1,
288};
289
290int acp_platform_register(struct device *dev)
291{
292	struct acp_dev_data *adata = dev_get_drvdata(dev);
293	struct snd_soc_dai_driver;
294	unsigned int status;
295
296	status = devm_request_irq(dev, adata->i2s_irq, i2s_irq_handler,
297				  IRQF_SHARED, "ACP_I2S_IRQ", adata);
298	if (status) {
299		dev_err(dev, "ACP I2S IRQ request failed\n");
300		return status;
301	}
302
303	status = devm_snd_soc_register_component(dev, &acp_pcm_component,
304						 adata->dai_driver,
305						 adata->num_dai);
306	if (status) {
307		dev_err(dev, "Fail to register acp i2s component\n");
308		return status;
309	}
310
311	INIT_LIST_HEAD(&adata->stream_list);
312	spin_lock_init(&adata->acp_lock);
313
314	return 0;
315}
316EXPORT_SYMBOL_NS_GPL(acp_platform_register, SND_SOC_ACP_COMMON);
317
318int acp_platform_unregister(struct device *dev)
319{
320	struct acp_dev_data *adata = dev_get_drvdata(dev);
321
322	if (adata->mach_dev)
323		platform_device_unregister(adata->mach_dev);
324	return 0;
325}
326EXPORT_SYMBOL_NS_GPL(acp_platform_unregister, SND_SOC_ACP_COMMON);
327
328MODULE_DESCRIPTION("AMD ACP PCM Driver");
329MODULE_LICENSE("Dual BSD/GPL");
330MODULE_ALIAS(DRV_NAME);
331