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14#include <linux/clk.h>
15#include <linux/delay.h>
16#include <linux/device.h>
17#include <linux/dma-mapping.h>
18#include <linux/init.h>
19#include <linux/interrupt.h>
20#include <linux/module.h>
21#include <linux/platform_device.h>
22#include <linux/slab.h>
23
24#include <sound/core.h>
25#include <sound/initval.h>
26#include <sound/pcm.h>
27#include <sound/pcm_params.h>
28#include <sound/soc.h>
29
30#include <mach/dma-mx1-mx2.h>
31
32#include "imx-ssi.h"
33
34struct imx_pcm_runtime_data {
35 int sg_count;
36 struct scatterlist *sg_list;
37 int period;
38 int periods;
39 unsigned long dma_addr;
40 int dma;
41 struct snd_pcm_substream *substream;
42 unsigned long offset;
43 unsigned long size;
44 unsigned long period_cnt;
45 void *buf;
46 int period_time;
47};
48
49
50static void imx_ssi_dma_progression(int channel, void *data,
51 struct scatterlist *sg)
52{
53 struct snd_pcm_substream *substream = data;
54 struct snd_pcm_runtime *runtime = substream->runtime;
55 struct imx_pcm_runtime_data *iprtd = runtime->private_data;
56
57 if (!sg)
58 return;
59
60 runtime = iprtd->substream->runtime;
61
62 iprtd->offset = sg->dma_address - runtime->dma_addr;
63
64 snd_pcm_period_elapsed(iprtd->substream);
65}
66
67static void imx_ssi_dma_callback(int channel, void *data)
68{
69 pr_err("%s shouldn't be called\n", __func__);
70}
71
72static void snd_imx_dma_err_callback(int channel, void *data, int err)
73{
74 struct snd_pcm_substream *substream = data;
75 struct snd_soc_pcm_runtime *rtd = substream->private_data;
76 struct imx_pcm_dma_params *dma_params =
77 snd_soc_dai_get_dma_data(rtd->dai->cpu_dai, substream);
78 struct snd_pcm_runtime *runtime = substream->runtime;
79 struct imx_pcm_runtime_data *iprtd = runtime->private_data;
80 int ret;
81
82 pr_err("DMA timeout on channel %d -%s%s%s%s\n",
83 channel,
84 err & IMX_DMA_ERR_BURST ? " burst" : "",
85 err & IMX_DMA_ERR_REQUEST ? " request" : "",
86 err & IMX_DMA_ERR_TRANSFER ? " transfer" : "",
87 err & IMX_DMA_ERR_BUFFER ? " buffer" : "");
88
89 imx_dma_disable(iprtd->dma);
90 ret = imx_dma_setup_sg(iprtd->dma, iprtd->sg_list, iprtd->sg_count,
91 IMX_DMA_LENGTH_LOOP, dma_params->dma_addr,
92 substream->stream == SNDRV_PCM_STREAM_PLAYBACK ?
93 DMA_MODE_WRITE : DMA_MODE_READ);
94 if (!ret)
95 imx_dma_enable(iprtd->dma);
96}
97
98static int imx_ssi_dma_alloc(struct snd_pcm_substream *substream)
99{
100 struct snd_soc_pcm_runtime *rtd = substream->private_data;
101 struct imx_pcm_dma_params *dma_params;
102 struct snd_pcm_runtime *runtime = substream->runtime;
103 struct imx_pcm_runtime_data *iprtd = runtime->private_data;
104 int ret;
105
106 dma_params = snd_soc_dai_get_dma_data(rtd->dai->cpu_dai, substream);
107
108 iprtd->dma = imx_dma_request_by_prio(DRV_NAME, DMA_PRIO_HIGH);
109 if (iprtd->dma < 0) {
110 pr_err("Failed to claim the audio DMA\n");
111 return -ENODEV;
112 }
113
114 ret = imx_dma_setup_handlers(iprtd->dma,
115 imx_ssi_dma_callback,
116 snd_imx_dma_err_callback, substream);
117 if (ret)
118 goto out;
119
120 ret = imx_dma_setup_progression_handler(iprtd->dma,
121 imx_ssi_dma_progression);
122 if (ret) {
123 pr_err("Failed to setup the DMA handler\n");
124 goto out;
125 }
126
127 ret = imx_dma_config_channel(iprtd->dma,
128 IMX_DMA_MEMSIZE_16 | IMX_DMA_TYPE_FIFO,
129 IMX_DMA_MEMSIZE_32 | IMX_DMA_TYPE_LINEAR,
130 dma_params->dma, 1);
131 if (ret < 0) {
132 pr_err("Cannot configure DMA channel: %d\n", ret);
133 goto out;
134 }
135
136 imx_dma_config_burstlen(iprtd->dma, dma_params->burstsize * 2);
137
138 return 0;
139out:
140 imx_dma_free(iprtd->dma);
141 return ret;
142}
143
144static int snd_imx_pcm_hw_params(struct snd_pcm_substream *substream,
145 struct snd_pcm_hw_params *params)
146{
147 struct snd_pcm_runtime *runtime = substream->runtime;
148 struct imx_pcm_runtime_data *iprtd = runtime->private_data;
149 int i;
150 unsigned long dma_addr;
151
152 imx_ssi_dma_alloc(substream);
153
154 iprtd->size = params_buffer_bytes(params);
155 iprtd->periods = params_periods(params);
156 iprtd->period = params_period_bytes(params);
157 iprtd->offset = 0;
158 iprtd->period_time = HZ / (params_rate(params) /
159 params_period_size(params));
160
161 snd_pcm_set_runtime_buffer(substream, &substream->dma_buffer);
162
163 if (iprtd->sg_count != iprtd->periods) {
164 kfree(iprtd->sg_list);
165
166 iprtd->sg_list = kcalloc(iprtd->periods + 1,
167 sizeof(struct scatterlist), GFP_KERNEL);
168 if (!iprtd->sg_list)
169 return -ENOMEM;
170 iprtd->sg_count = iprtd->periods + 1;
171 }
172
173 sg_init_table(iprtd->sg_list, iprtd->sg_count);
174 dma_addr = runtime->dma_addr;
175
176 for (i = 0; i < iprtd->periods; i++) {
177 iprtd->sg_list[i].page_link = 0;
178 iprtd->sg_list[i].offset = 0;
179 iprtd->sg_list[i].dma_address = dma_addr;
180 iprtd->sg_list[i].length = iprtd->period;
181 dma_addr += iprtd->period;
182 }
183
184
185 iprtd->sg_list[iprtd->sg_count - 1].offset = 0;
186 iprtd->sg_list[iprtd->sg_count - 1].length = 0;
187 iprtd->sg_list[iprtd->sg_count - 1].page_link =
188 ((unsigned long) iprtd->sg_list | 0x01) & ~0x02;
189 return 0;
190}
191
192static int snd_imx_pcm_hw_free(struct snd_pcm_substream *substream)
193{
194 struct snd_pcm_runtime *runtime = substream->runtime;
195 struct imx_pcm_runtime_data *iprtd = runtime->private_data;
196
197 if (iprtd->dma >= 0) {
198 imx_dma_free(iprtd->dma);
199 iprtd->dma = -EINVAL;
200 }
201
202 kfree(iprtd->sg_list);
203 iprtd->sg_list = NULL;
204
205 return 0;
206}
207
208static int snd_imx_pcm_prepare(struct snd_pcm_substream *substream)
209{
210 struct snd_pcm_runtime *runtime = substream->runtime;
211 struct snd_soc_pcm_runtime *rtd = substream->private_data;
212 struct imx_pcm_dma_params *dma_params;
213 struct imx_pcm_runtime_data *iprtd = runtime->private_data;
214 int err;
215
216 dma_params = snd_soc_dai_get_dma_data(rtd->dai->cpu_dai, substream);
217
218 iprtd->substream = substream;
219 iprtd->buf = (unsigned int *)substream->dma_buffer.area;
220 iprtd->period_cnt = 0;
221
222 pr_debug("%s: buf: %p period: %d periods: %d\n",
223 __func__, iprtd->buf, iprtd->period, iprtd->periods);
224
225 err = imx_dma_setup_sg(iprtd->dma, iprtd->sg_list, iprtd->sg_count,
226 IMX_DMA_LENGTH_LOOP, dma_params->dma_addr,
227 substream->stream == SNDRV_PCM_STREAM_PLAYBACK ?
228 DMA_MODE_WRITE : DMA_MODE_READ);
229 if (err)
230 return err;
231
232 return 0;
233}
234
235static int snd_imx_pcm_trigger(struct snd_pcm_substream *substream, int cmd)
236{
237 struct snd_pcm_runtime *runtime = substream->runtime;
238 struct imx_pcm_runtime_data *iprtd = runtime->private_data;
239
240 switch (cmd) {
241 case SNDRV_PCM_TRIGGER_START:
242 case SNDRV_PCM_TRIGGER_RESUME:
243 case SNDRV_PCM_TRIGGER_PAUSE_RELEASE:
244 imx_dma_enable(iprtd->dma);
245
246 break;
247
248 case SNDRV_PCM_TRIGGER_STOP:
249 case SNDRV_PCM_TRIGGER_SUSPEND:
250 case SNDRV_PCM_TRIGGER_PAUSE_PUSH:
251 imx_dma_disable(iprtd->dma);
252
253 break;
254 default:
255 return -EINVAL;
256 }
257
258 return 0;
259}
260
261static snd_pcm_uframes_t snd_imx_pcm_pointer(struct snd_pcm_substream *substream)
262{
263 struct snd_pcm_runtime *runtime = substream->runtime;
264 struct imx_pcm_runtime_data *iprtd = runtime->private_data;
265
266 return bytes_to_frames(substream->runtime, iprtd->offset);
267}
268
269static struct snd_pcm_hardware snd_imx_hardware = {
270 .info = SNDRV_PCM_INFO_INTERLEAVED |
271 SNDRV_PCM_INFO_BLOCK_TRANSFER |
272 SNDRV_PCM_INFO_MMAP |
273 SNDRV_PCM_INFO_MMAP_VALID |
274 SNDRV_PCM_INFO_PAUSE |
275 SNDRV_PCM_INFO_RESUME,
276 .formats = SNDRV_PCM_FMTBIT_S16_LE,
277 .rate_min = 8000,
278 .channels_min = 2,
279 .channels_max = 2,
280 .buffer_bytes_max = IMX_SSI_DMABUF_SIZE,
281 .period_bytes_min = 128,
282 .period_bytes_max = 16 * 1024,
283 .periods_min = 2,
284 .periods_max = 255,
285 .fifo_size = 0,
286};
287
288static int snd_imx_open(struct snd_pcm_substream *substream)
289{
290 struct snd_pcm_runtime *runtime = substream->runtime;
291 struct imx_pcm_runtime_data *iprtd;
292 int ret;
293
294 iprtd = kzalloc(sizeof(*iprtd), GFP_KERNEL);
295 runtime->private_data = iprtd;
296
297 ret = snd_pcm_hw_constraint_integer(substream->runtime,
298 SNDRV_PCM_HW_PARAM_PERIODS);
299 if (ret < 0)
300 return ret;
301
302 snd_soc_set_runtime_hwparams(substream, &snd_imx_hardware);
303 return 0;
304}
305
306static struct snd_pcm_ops imx_pcm_ops = {
307 .open = snd_imx_open,
308 .ioctl = snd_pcm_lib_ioctl,
309 .hw_params = snd_imx_pcm_hw_params,
310 .hw_free = snd_imx_pcm_hw_free,
311 .prepare = snd_imx_pcm_prepare,
312 .trigger = snd_imx_pcm_trigger,
313 .pointer = snd_imx_pcm_pointer,
314 .mmap = snd_imx_pcm_mmap,
315};
316
317static struct snd_soc_platform imx_soc_platform_dma = {
318 .name = "imx-audio",
319 .pcm_ops = &imx_pcm_ops,
320 .pcm_new = imx_pcm_new,
321 .pcm_free = imx_pcm_free,
322};
323
324struct snd_soc_platform *imx_ssi_dma_mx2_init(struct platform_device *pdev,
325 struct imx_ssi *ssi)
326{
327 ssi->dma_params_tx.burstsize = DMA_TXFIFO_BURST;
328 ssi->dma_params_rx.burstsize = DMA_RXFIFO_BURST;
329
330 return &imx_soc_platform_dma;
331}
332
333
