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