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
27 static 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
48 static 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
acp_machine_select(struct acp_dev_data * adata)69 int 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 }
88 EXPORT_SYMBOL_NS_GPL(acp_machine_select, SND_SOC_ACP_COMMON);
89
i2s_irq_handler(int irq,void * data)90 static 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
config_pte_for_stream(struct acp_dev_data * adata,struct acp_stream * stream)130 void 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 }
146 EXPORT_SYMBOL_NS_GPL(config_pte_for_stream, SND_SOC_ACP_COMMON);
147
config_acp_dma(struct acp_dev_data * adata,struct acp_stream * stream,int size)148 void 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 }
172 EXPORT_SYMBOL_NS_GPL(config_acp_dma, SND_SOC_ACP_COMMON);
173
acp_dma_open(struct snd_soc_component * component,struct snd_pcm_substream * substream)174 static 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
acp_dma_hw_params(struct snd_soc_component * component,struct snd_pcm_substream * substream,struct snd_pcm_hw_params * params)210 static 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
acp_dma_pointer(struct snd_soc_component * component,struct snd_pcm_substream * substream)225 static 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
acp_dma_new(struct snd_soc_component * component,struct snd_soc_pcm_runtime * rtd)247 static 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
acp_dma_close(struct snd_soc_component * component,struct snd_pcm_substream * substream)257 static 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
273 static 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
acp_platform_register(struct device * dev)283 int 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 }
309 EXPORT_SYMBOL_NS_GPL(acp_platform_register, SND_SOC_ACP_COMMON);
310
acp_platform_unregister(struct device * dev)311 int 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 }
319 EXPORT_SYMBOL_NS_GPL(acp_platform_unregister, SND_SOC_ACP_COMMON);
320
321 MODULE_DESCRIPTION("AMD ACP PCM Driver");
322 MODULE_LICENSE("Dual BSD/GPL");
323 MODULE_ALIAS(DRV_NAME);
324