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8380222e SH |
1 | /* |
2 | * imx-pcm-fiq.c -- ALSA Soc Audio Layer | |
3 | * | |
4 | * Copyright 2009 Sascha Hauer <s.hauer@pengutronix.de> | |
5 | * | |
6 | * This code is based on code copyrighted by Freescale, | |
7 | * Liam Girdwood, Javier Martin and probably others. | |
8 | * | |
9 | * This program is free software; you can redistribute it and/or modify it | |
10 | * under the terms of the GNU General Public License as published by the | |
11 | * Free Software Foundation; either version 2 of the License, or (at your | |
12 | * option) any later version. | |
13 | */ | |
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> | |
5a0e3ad6 | 22 | #include <linux/slab.h> |
8380222e SH |
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 <asm/fiq.h> | |
31 | ||
32 | #include <mach/ssi.h> | |
33 | ||
34 | #include "imx-ssi.h" | |
35 | ||
36 | struct imx_pcm_runtime_data { | |
37 | int period; | |
38 | int periods; | |
8380222e | 39 | unsigned long offset; |
b4e82b5b | 40 | unsigned long last_offset; |
8380222e | 41 | unsigned long size; |
43a3cec0 SH |
42 | struct hrtimer hrt; |
43 | int poll_time_ns; | |
44 | struct snd_pcm_substream *substream; | |
83926099 | 45 | atomic_t running; |
8380222e SH |
46 | }; |
47 | ||
43a3cec0 | 48 | static enum hrtimer_restart snd_hrtimer_callback(struct hrtimer *hrt) |
b4e82b5b | 49 | { |
43a3cec0 SH |
50 | struct imx_pcm_runtime_data *iprtd = |
51 | container_of(hrt, struct imx_pcm_runtime_data, hrt); | |
52 | struct snd_pcm_substream *substream = iprtd->substream; | |
8380222e | 53 | struct snd_pcm_runtime *runtime = substream->runtime; |
8380222e | 54 | struct pt_regs regs; |
b4e82b5b | 55 | unsigned long delta; |
8380222e | 56 | |
83926099 SH |
57 | if (!atomic_read(&iprtd->running)) |
58 | return HRTIMER_NORESTART; | |
59 | ||
8380222e SH |
60 | get_fiq_regs(®s); |
61 | ||
62 | if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) | |
63 | iprtd->offset = regs.ARM_r8 & 0xffff; | |
64 | else | |
65 | iprtd->offset = regs.ARM_r9 & 0xffff; | |
66 | ||
b4e82b5b MB |
67 | /* How much data have we transferred since the last period report? */ |
68 | if (iprtd->offset >= iprtd->last_offset) | |
69 | delta = iprtd->offset - iprtd->last_offset; | |
70 | else | |
71 | delta = runtime->buffer_size + iprtd->offset | |
72 | - iprtd->last_offset; | |
73 | ||
74 | /* If we've transferred at least a period then report it and | |
75 | * reset our poll time */ | |
43a3cec0 | 76 | if (delta >= iprtd->period) { |
b4e82b5b MB |
77 | snd_pcm_period_elapsed(substream); |
78 | iprtd->last_offset = iprtd->offset; | |
b4e82b5b MB |
79 | } |
80 | ||
43a3cec0 | 81 | hrtimer_forward_now(hrt, ns_to_ktime(iprtd->poll_time_ns)); |
b4e82b5b | 82 | |
43a3cec0 | 83 | return HRTIMER_RESTART; |
8380222e SH |
84 | } |
85 | ||
86 | static struct fiq_handler fh = { | |
87 | .name = DRV_NAME, | |
88 | }; | |
89 | ||
90 | static int snd_imx_pcm_hw_params(struct snd_pcm_substream *substream, | |
91 | struct snd_pcm_hw_params *params) | |
92 | { | |
93 | struct snd_pcm_runtime *runtime = substream->runtime; | |
94 | struct imx_pcm_runtime_data *iprtd = runtime->private_data; | |
95 | ||
96 | iprtd->size = params_buffer_bytes(params); | |
97 | iprtd->periods = params_periods(params); | |
b4e82b5b | 98 | iprtd->period = params_period_bytes(params) ; |
8380222e | 99 | iprtd->offset = 0; |
b4e82b5b | 100 | iprtd->last_offset = 0; |
43a3cec0 SH |
101 | iprtd->poll_time_ns = 1000000000 / params_rate(params) * |
102 | params_period_size(params); | |
8380222e SH |
103 | snd_pcm_set_runtime_buffer(substream, &substream->dma_buffer); |
104 | ||
105 | return 0; | |
106 | } | |
107 | ||
108 | static int snd_imx_pcm_prepare(struct snd_pcm_substream *substream) | |
109 | { | |
110 | struct snd_pcm_runtime *runtime = substream->runtime; | |
111 | struct imx_pcm_runtime_data *iprtd = runtime->private_data; | |
112 | struct pt_regs regs; | |
113 | ||
114 | get_fiq_regs(®s); | |
115 | if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) | |
116 | regs.ARM_r8 = (iprtd->period * iprtd->periods - 1) << 16; | |
117 | else | |
118 | regs.ARM_r9 = (iprtd->period * iprtd->periods - 1) << 16; | |
119 | ||
120 | set_fiq_regs(®s); | |
121 | ||
122 | return 0; | |
123 | } | |
124 | ||
125 | static int fiq_enable; | |
126 | static int imx_pcm_fiq; | |
127 | ||
128 | static int snd_imx_pcm_trigger(struct snd_pcm_substream *substream, int cmd) | |
129 | { | |
130 | struct snd_pcm_runtime *runtime = substream->runtime; | |
131 | struct imx_pcm_runtime_data *iprtd = runtime->private_data; | |
132 | ||
133 | switch (cmd) { | |
134 | case SNDRV_PCM_TRIGGER_START: | |
135 | case SNDRV_PCM_TRIGGER_RESUME: | |
136 | case SNDRV_PCM_TRIGGER_PAUSE_RELEASE: | |
83926099 | 137 | atomic_set(&iprtd->running, 1); |
43a3cec0 SH |
138 | hrtimer_start(&iprtd->hrt, ns_to_ktime(iprtd->poll_time_ns), |
139 | HRTIMER_MODE_REL); | |
8380222e SH |
140 | if (++fiq_enable == 1) |
141 | enable_fiq(imx_pcm_fiq); | |
142 | ||
143 | break; | |
144 | ||
145 | case SNDRV_PCM_TRIGGER_STOP: | |
146 | case SNDRV_PCM_TRIGGER_SUSPEND: | |
147 | case SNDRV_PCM_TRIGGER_PAUSE_PUSH: | |
83926099 SH |
148 | atomic_set(&iprtd->running, 0); |
149 | ||
8380222e SH |
150 | if (--fiq_enable == 0) |
151 | disable_fiq(imx_pcm_fiq); | |
152 | ||
8380222e SH |
153 | break; |
154 | default: | |
155 | return -EINVAL; | |
156 | } | |
157 | ||
158 | return 0; | |
159 | } | |
160 | ||
161 | static snd_pcm_uframes_t snd_imx_pcm_pointer(struct snd_pcm_substream *substream) | |
162 | { | |
163 | struct snd_pcm_runtime *runtime = substream->runtime; | |
164 | struct imx_pcm_runtime_data *iprtd = runtime->private_data; | |
165 | ||
166 | return bytes_to_frames(substream->runtime, iprtd->offset); | |
167 | } | |
168 | ||
169 | static struct snd_pcm_hardware snd_imx_hardware = { | |
170 | .info = SNDRV_PCM_INFO_INTERLEAVED | | |
171 | SNDRV_PCM_INFO_BLOCK_TRANSFER | | |
172 | SNDRV_PCM_INFO_MMAP | | |
173 | SNDRV_PCM_INFO_MMAP_VALID | | |
174 | SNDRV_PCM_INFO_PAUSE | | |
175 | SNDRV_PCM_INFO_RESUME, | |
176 | .formats = SNDRV_PCM_FMTBIT_S16_LE, | |
177 | .rate_min = 8000, | |
178 | .channels_min = 2, | |
179 | .channels_max = 2, | |
180 | .buffer_bytes_max = IMX_SSI_DMABUF_SIZE, | |
181 | .period_bytes_min = 128, | |
182 | .period_bytes_max = 16 * 1024, | |
565a79f7 | 183 | .periods_min = 4, |
8380222e SH |
184 | .periods_max = 255, |
185 | .fifo_size = 0, | |
186 | }; | |
187 | ||
188 | static int snd_imx_open(struct snd_pcm_substream *substream) | |
189 | { | |
190 | struct snd_pcm_runtime *runtime = substream->runtime; | |
191 | struct imx_pcm_runtime_data *iprtd; | |
192 | int ret; | |
193 | ||
194 | iprtd = kzalloc(sizeof(*iprtd), GFP_KERNEL); | |
50e8ce14 KV |
195 | if (iprtd == NULL) |
196 | return -ENOMEM; | |
8380222e SH |
197 | runtime->private_data = iprtd; |
198 | ||
43a3cec0 SH |
199 | iprtd->substream = substream; |
200 | ||
83926099 | 201 | atomic_set(&iprtd->running, 0); |
43a3cec0 SH |
202 | hrtimer_init(&iprtd->hrt, CLOCK_MONOTONIC, HRTIMER_MODE_REL); |
203 | iprtd->hrt.function = snd_hrtimer_callback; | |
8380222e SH |
204 | |
205 | ret = snd_pcm_hw_constraint_integer(substream->runtime, | |
206 | SNDRV_PCM_HW_PARAM_PERIODS); | |
50e8ce14 KV |
207 | if (ret < 0) { |
208 | kfree(iprtd); | |
8380222e | 209 | return ret; |
50e8ce14 | 210 | } |
8380222e SH |
211 | |
212 | snd_soc_set_runtime_hwparams(substream, &snd_imx_hardware); | |
213 | return 0; | |
214 | } | |
215 | ||
216 | static int snd_imx_close(struct snd_pcm_substream *substream) | |
217 | { | |
218 | struct snd_pcm_runtime *runtime = substream->runtime; | |
219 | struct imx_pcm_runtime_data *iprtd = runtime->private_data; | |
220 | ||
43a3cec0 SH |
221 | hrtimer_cancel(&iprtd->hrt); |
222 | ||
8380222e SH |
223 | kfree(iprtd); |
224 | ||
225 | return 0; | |
226 | } | |
227 | ||
228 | static struct snd_pcm_ops imx_pcm_ops = { | |
229 | .open = snd_imx_open, | |
230 | .close = snd_imx_close, | |
231 | .ioctl = snd_pcm_lib_ioctl, | |
232 | .hw_params = snd_imx_pcm_hw_params, | |
233 | .prepare = snd_imx_pcm_prepare, | |
234 | .trigger = snd_imx_pcm_trigger, | |
235 | .pointer = snd_imx_pcm_pointer, | |
236 | .mmap = snd_imx_pcm_mmap, | |
237 | }; | |
238 | ||
239 | static int imx_pcm_fiq_new(struct snd_card *card, struct snd_soc_dai *dai, | |
240 | struct snd_pcm *pcm) | |
241 | { | |
242 | int ret; | |
243 | ||
244 | ret = imx_pcm_new(card, dai, pcm); | |
245 | if (ret) | |
246 | return ret; | |
247 | ||
248 | if (dai->playback.channels_min) { | |
249 | struct snd_pcm_substream *substream = | |
250 | pcm->streams[SNDRV_PCM_STREAM_PLAYBACK].substream; | |
251 | struct snd_dma_buffer *buf = &substream->dma_buffer; | |
252 | ||
253 | imx_ssi_fiq_tx_buffer = (unsigned long)buf->area; | |
254 | } | |
255 | ||
256 | if (dai->capture.channels_min) { | |
257 | struct snd_pcm_substream *substream = | |
258 | pcm->streams[SNDRV_PCM_STREAM_CAPTURE].substream; | |
259 | struct snd_dma_buffer *buf = &substream->dma_buffer; | |
260 | ||
261 | imx_ssi_fiq_rx_buffer = (unsigned long)buf->area; | |
262 | } | |
263 | ||
264 | set_fiq_handler(&imx_ssi_fiq_start, | |
265 | &imx_ssi_fiq_end - &imx_ssi_fiq_start); | |
266 | ||
267 | return 0; | |
268 | } | |
269 | ||
270 | static struct snd_soc_platform imx_soc_platform_fiq = { | |
271 | .pcm_ops = &imx_pcm_ops, | |
272 | .pcm_new = imx_pcm_fiq_new, | |
273 | .pcm_free = imx_pcm_free, | |
274 | }; | |
275 | ||
276 | struct snd_soc_platform *imx_ssi_fiq_init(struct platform_device *pdev, | |
277 | struct imx_ssi *ssi) | |
278 | { | |
279 | int ret = 0; | |
280 | ||
281 | ret = claim_fiq(&fh); | |
282 | if (ret) { | |
283 | dev_err(&pdev->dev, "failed to claim fiq: %d", ret); | |
284 | return ERR_PTR(ret); | |
285 | } | |
286 | ||
287 | mxc_set_irq_fiq(ssi->irq, 1); | |
288 | ||
289 | imx_pcm_fiq = ssi->irq; | |
290 | ||
291 | imx_ssi_fiq_base = (unsigned long)ssi->base; | |
292 | ||
293 | ssi->dma_params_tx.burstsize = 4; | |
294 | ssi->dma_params_rx.burstsize = 6; | |
295 | ||
296 | return &imx_soc_platform_fiq; | |
297 | } | |
298 | ||
299 | void imx_ssi_fiq_exit(struct platform_device *pdev, | |
300 | struct imx_ssi *ssi) | |
301 | { | |
302 | mxc_set_irq_fiq(ssi->irq, 0); | |
303 | release_fiq(&fh); | |
304 | } | |
305 |