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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> | |
22 | ||
23 | #include <sound/core.h> | |
24 | #include <sound/initval.h> | |
25 | #include <sound/pcm.h> | |
26 | #include <sound/pcm_params.h> | |
27 | #include <sound/soc.h> | |
28 | ||
29 | #include <asm/fiq.h> | |
30 | ||
31 | #include <mach/ssi.h> | |
32 | ||
33 | #include "imx-ssi.h" | |
34 | ||
35 | struct imx_pcm_runtime_data { | |
36 | int period; | |
37 | int periods; | |
8380222e | 38 | unsigned long offset; |
b4e82b5b | 39 | unsigned long last_offset; |
8380222e | 40 | unsigned long size; |
8380222e | 41 | struct timer_list timer; |
b4e82b5b | 42 | int poll_time; |
8380222e SH |
43 | }; |
44 | ||
b4e82b5b MB |
45 | static inline void imx_ssi_set_next_poll(struct imx_pcm_runtime_data *iprtd) |
46 | { | |
47 | iprtd->timer.expires = jiffies + iprtd->poll_time; | |
48 | } | |
49 | ||
8380222e SH |
50 | static void imx_ssi_timer_callback(unsigned long data) |
51 | { | |
52 | struct snd_pcm_substream *substream = (void *)data; | |
53 | struct snd_pcm_runtime *runtime = substream->runtime; | |
54 | struct imx_pcm_runtime_data *iprtd = runtime->private_data; | |
55 | struct pt_regs regs; | |
b4e82b5b | 56 | unsigned long delta; |
8380222e SH |
57 | |
58 | get_fiq_regs(®s); | |
59 | ||
60 | if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) | |
61 | iprtd->offset = regs.ARM_r8 & 0xffff; | |
62 | else | |
63 | iprtd->offset = regs.ARM_r9 & 0xffff; | |
64 | ||
b4e82b5b MB |
65 | /* How much data have we transferred since the last period report? */ |
66 | if (iprtd->offset >= iprtd->last_offset) | |
67 | delta = iprtd->offset - iprtd->last_offset; | |
68 | else | |
69 | delta = runtime->buffer_size + iprtd->offset | |
70 | - iprtd->last_offset; | |
71 | ||
72 | /* If we've transferred at least a period then report it and | |
73 | * reset our poll time */ | |
74 | if (delta >= runtime->period_size) { | |
75 | snd_pcm_period_elapsed(substream); | |
76 | iprtd->last_offset = iprtd->offset; | |
77 | ||
78 | imx_ssi_set_next_poll(iprtd); | |
79 | } | |
80 | ||
81 | /* Restart the timer; if we didn't report we'll run on the next tick */ | |
8380222e | 82 | add_timer(&iprtd->timer); |
b4e82b5b | 83 | |
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 MB |
100 | iprtd->last_offset = 0; |
101 | iprtd->poll_time = HZ / (params_rate(params) / params_period_size(params)); | |
8380222e SH |
102 | |
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: | |
b4e82b5b | 137 | imx_ssi_set_next_poll(iprtd); |
8380222e SH |
138 | add_timer(&iprtd->timer); |
139 | if (++fiq_enable == 1) | |
140 | enable_fiq(imx_pcm_fiq); | |
141 | ||
142 | break; | |
143 | ||
144 | case SNDRV_PCM_TRIGGER_STOP: | |
145 | case SNDRV_PCM_TRIGGER_SUSPEND: | |
146 | case SNDRV_PCM_TRIGGER_PAUSE_PUSH: | |
147 | del_timer(&iprtd->timer); | |
148 | if (--fiq_enable == 0) | |
149 | disable_fiq(imx_pcm_fiq); | |
150 | ||
151 | ||
152 | break; | |
153 | default: | |
154 | return -EINVAL; | |
155 | } | |
156 | ||
157 | return 0; | |
158 | } | |
159 | ||
160 | static snd_pcm_uframes_t snd_imx_pcm_pointer(struct snd_pcm_substream *substream) | |
161 | { | |
162 | struct snd_pcm_runtime *runtime = substream->runtime; | |
163 | struct imx_pcm_runtime_data *iprtd = runtime->private_data; | |
164 | ||
165 | return bytes_to_frames(substream->runtime, iprtd->offset); | |
166 | } | |
167 | ||
168 | static struct snd_pcm_hardware snd_imx_hardware = { | |
169 | .info = SNDRV_PCM_INFO_INTERLEAVED | | |
170 | SNDRV_PCM_INFO_BLOCK_TRANSFER | | |
171 | SNDRV_PCM_INFO_MMAP | | |
172 | SNDRV_PCM_INFO_MMAP_VALID | | |
173 | SNDRV_PCM_INFO_PAUSE | | |
174 | SNDRV_PCM_INFO_RESUME, | |
175 | .formats = SNDRV_PCM_FMTBIT_S16_LE, | |
176 | .rate_min = 8000, | |
177 | .channels_min = 2, | |
178 | .channels_max = 2, | |
179 | .buffer_bytes_max = IMX_SSI_DMABUF_SIZE, | |
180 | .period_bytes_min = 128, | |
181 | .period_bytes_max = 16 * 1024, | |
182 | .periods_min = 2, | |
183 | .periods_max = 255, | |
184 | .fifo_size = 0, | |
185 | }; | |
186 | ||
187 | static int snd_imx_open(struct snd_pcm_substream *substream) | |
188 | { | |
189 | struct snd_pcm_runtime *runtime = substream->runtime; | |
190 | struct imx_pcm_runtime_data *iprtd; | |
191 | int ret; | |
192 | ||
193 | iprtd = kzalloc(sizeof(*iprtd), GFP_KERNEL); | |
194 | runtime->private_data = iprtd; | |
195 | ||
196 | init_timer(&iprtd->timer); | |
197 | iprtd->timer.data = (unsigned long)substream; | |
198 | iprtd->timer.function = imx_ssi_timer_callback; | |
199 | ||
200 | ret = snd_pcm_hw_constraint_integer(substream->runtime, | |
201 | SNDRV_PCM_HW_PARAM_PERIODS); | |
202 | if (ret < 0) | |
203 | return ret; | |
204 | ||
205 | snd_soc_set_runtime_hwparams(substream, &snd_imx_hardware); | |
206 | return 0; | |
207 | } | |
208 | ||
209 | static int snd_imx_close(struct snd_pcm_substream *substream) | |
210 | { | |
211 | struct snd_pcm_runtime *runtime = substream->runtime; | |
212 | struct imx_pcm_runtime_data *iprtd = runtime->private_data; | |
213 | ||
214 | del_timer_sync(&iprtd->timer); | |
215 | kfree(iprtd); | |
216 | ||
217 | return 0; | |
218 | } | |
219 | ||
220 | static struct snd_pcm_ops imx_pcm_ops = { | |
221 | .open = snd_imx_open, | |
222 | .close = snd_imx_close, | |
223 | .ioctl = snd_pcm_lib_ioctl, | |
224 | .hw_params = snd_imx_pcm_hw_params, | |
225 | .prepare = snd_imx_pcm_prepare, | |
226 | .trigger = snd_imx_pcm_trigger, | |
227 | .pointer = snd_imx_pcm_pointer, | |
228 | .mmap = snd_imx_pcm_mmap, | |
229 | }; | |
230 | ||
231 | static int imx_pcm_fiq_new(struct snd_card *card, struct snd_soc_dai *dai, | |
232 | struct snd_pcm *pcm) | |
233 | { | |
234 | int ret; | |
235 | ||
236 | ret = imx_pcm_new(card, dai, pcm); | |
237 | if (ret) | |
238 | return ret; | |
239 | ||
240 | if (dai->playback.channels_min) { | |
241 | struct snd_pcm_substream *substream = | |
242 | pcm->streams[SNDRV_PCM_STREAM_PLAYBACK].substream; | |
243 | struct snd_dma_buffer *buf = &substream->dma_buffer; | |
244 | ||
245 | imx_ssi_fiq_tx_buffer = (unsigned long)buf->area; | |
246 | } | |
247 | ||
248 | if (dai->capture.channels_min) { | |
249 | struct snd_pcm_substream *substream = | |
250 | pcm->streams[SNDRV_PCM_STREAM_CAPTURE].substream; | |
251 | struct snd_dma_buffer *buf = &substream->dma_buffer; | |
252 | ||
253 | imx_ssi_fiq_rx_buffer = (unsigned long)buf->area; | |
254 | } | |
255 | ||
256 | set_fiq_handler(&imx_ssi_fiq_start, | |
257 | &imx_ssi_fiq_end - &imx_ssi_fiq_start); | |
258 | ||
259 | return 0; | |
260 | } | |
261 | ||
262 | static struct snd_soc_platform imx_soc_platform_fiq = { | |
263 | .pcm_ops = &imx_pcm_ops, | |
264 | .pcm_new = imx_pcm_fiq_new, | |
265 | .pcm_free = imx_pcm_free, | |
266 | }; | |
267 | ||
268 | struct snd_soc_platform *imx_ssi_fiq_init(struct platform_device *pdev, | |
269 | struct imx_ssi *ssi) | |
270 | { | |
271 | int ret = 0; | |
272 | ||
273 | ret = claim_fiq(&fh); | |
274 | if (ret) { | |
275 | dev_err(&pdev->dev, "failed to claim fiq: %d", ret); | |
276 | return ERR_PTR(ret); | |
277 | } | |
278 | ||
279 | mxc_set_irq_fiq(ssi->irq, 1); | |
280 | ||
281 | imx_pcm_fiq = ssi->irq; | |
282 | ||
283 | imx_ssi_fiq_base = (unsigned long)ssi->base; | |
284 | ||
285 | ssi->dma_params_tx.burstsize = 4; | |
286 | ssi->dma_params_rx.burstsize = 6; | |
287 | ||
288 | return &imx_soc_platform_fiq; | |
289 | } | |
290 | ||
291 | void imx_ssi_fiq_exit(struct platform_device *pdev, | |
292 | struct imx_ssi *ssi) | |
293 | { | |
294 | mxc_set_irq_fiq(ssi->irq, 0); | |
295 | release_fiq(&fh); | |
296 | } | |
297 |