Sascha Hauer | 8380222 | 2009-11-25 16:41:04 +0100 | [diff] [blame] | 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> |
Tejun Heo | 5a0e3ad | 2010-03-24 17:04:11 +0900 | [diff] [blame] | 22 | #include <linux/slab.h> |
Sascha Hauer | 8380222 | 2009-11-25 16:41:04 +0100 | [diff] [blame] | 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 | |
Shawn Guo | 8842a9e | 2012-06-14 11:16:14 +0800 | [diff] [blame] | 32 | #include <mach/irqs.h> |
Arnd Bergmann | 82906b1 | 2012-08-24 15:14:29 +0200 | [diff] [blame] | 33 | #include <linux/platform_data/asoc-imx-ssi.h> |
Sascha Hauer | 8380222 | 2009-11-25 16:41:04 +0100 | [diff] [blame] | 34 | |
| 35 | #include "imx-ssi.h" |
| 36 | |
| 37 | struct imx_pcm_runtime_data { |
| 38 | int period; |
| 39 | int periods; |
Sascha Hauer | 8380222 | 2009-11-25 16:41:04 +0100 | [diff] [blame] | 40 | unsigned long offset; |
Mark Brown | b4e82b5 | 2010-02-25 12:52:10 +0000 | [diff] [blame] | 41 | unsigned long last_offset; |
Sascha Hauer | 8380222 | 2009-11-25 16:41:04 +0100 | [diff] [blame] | 42 | unsigned long size; |
Sascha Hauer | 43a3cec | 2010-04-08 11:31:26 +0200 | [diff] [blame] | 43 | struct hrtimer hrt; |
| 44 | int poll_time_ns; |
| 45 | struct snd_pcm_substream *substream; |
Sascha Hauer | 8392609 | 2010-04-14 09:17:30 +0200 | [diff] [blame] | 46 | atomic_t running; |
Sascha Hauer | 8380222 | 2009-11-25 16:41:04 +0100 | [diff] [blame] | 47 | }; |
| 48 | |
Sascha Hauer | 43a3cec | 2010-04-08 11:31:26 +0200 | [diff] [blame] | 49 | static enum hrtimer_restart snd_hrtimer_callback(struct hrtimer *hrt) |
Mark Brown | b4e82b5 | 2010-02-25 12:52:10 +0000 | [diff] [blame] | 50 | { |
Sascha Hauer | 43a3cec | 2010-04-08 11:31:26 +0200 | [diff] [blame] | 51 | struct imx_pcm_runtime_data *iprtd = |
| 52 | container_of(hrt, struct imx_pcm_runtime_data, hrt); |
| 53 | struct snd_pcm_substream *substream = iprtd->substream; |
Sascha Hauer | 8380222 | 2009-11-25 16:41:04 +0100 | [diff] [blame] | 54 | struct snd_pcm_runtime *runtime = substream->runtime; |
Sascha Hauer | 8380222 | 2009-11-25 16:41:04 +0100 | [diff] [blame] | 55 | struct pt_regs regs; |
Mark Brown | b4e82b5 | 2010-02-25 12:52:10 +0000 | [diff] [blame] | 56 | unsigned long delta; |
Sascha Hauer | 8380222 | 2009-11-25 16:41:04 +0100 | [diff] [blame] | 57 | |
Sascha Hauer | 8392609 | 2010-04-14 09:17:30 +0200 | [diff] [blame] | 58 | if (!atomic_read(&iprtd->running)) |
| 59 | return HRTIMER_NORESTART; |
| 60 | |
Sascha Hauer | 8380222 | 2009-11-25 16:41:04 +0100 | [diff] [blame] | 61 | get_fiq_regs(®s); |
| 62 | |
| 63 | if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) |
| 64 | iprtd->offset = regs.ARM_r8 & 0xffff; |
| 65 | else |
| 66 | iprtd->offset = regs.ARM_r9 & 0xffff; |
| 67 | |
Mark Brown | b4e82b5 | 2010-02-25 12:52:10 +0000 | [diff] [blame] | 68 | /* How much data have we transferred since the last period report? */ |
| 69 | if (iprtd->offset >= iprtd->last_offset) |
| 70 | delta = iprtd->offset - iprtd->last_offset; |
| 71 | else |
| 72 | delta = runtime->buffer_size + iprtd->offset |
| 73 | - iprtd->last_offset; |
| 74 | |
| 75 | /* If we've transferred at least a period then report it and |
| 76 | * reset our poll time */ |
Sascha Hauer | 43a3cec | 2010-04-08 11:31:26 +0200 | [diff] [blame] | 77 | if (delta >= iprtd->period) { |
Mark Brown | b4e82b5 | 2010-02-25 12:52:10 +0000 | [diff] [blame] | 78 | snd_pcm_period_elapsed(substream); |
| 79 | iprtd->last_offset = iprtd->offset; |
Mark Brown | b4e82b5 | 2010-02-25 12:52:10 +0000 | [diff] [blame] | 80 | } |
| 81 | |
Sascha Hauer | 43a3cec | 2010-04-08 11:31:26 +0200 | [diff] [blame] | 82 | hrtimer_forward_now(hrt, ns_to_ktime(iprtd->poll_time_ns)); |
Mark Brown | b4e82b5 | 2010-02-25 12:52:10 +0000 | [diff] [blame] | 83 | |
Sascha Hauer | 43a3cec | 2010-04-08 11:31:26 +0200 | [diff] [blame] | 84 | return HRTIMER_RESTART; |
Sascha Hauer | 8380222 | 2009-11-25 16:41:04 +0100 | [diff] [blame] | 85 | } |
| 86 | |
| 87 | static struct fiq_handler fh = { |
| 88 | .name = DRV_NAME, |
| 89 | }; |
| 90 | |
| 91 | static int snd_imx_pcm_hw_params(struct snd_pcm_substream *substream, |
| 92 | struct snd_pcm_hw_params *params) |
| 93 | { |
| 94 | struct snd_pcm_runtime *runtime = substream->runtime; |
| 95 | struct imx_pcm_runtime_data *iprtd = runtime->private_data; |
| 96 | |
| 97 | iprtd->size = params_buffer_bytes(params); |
| 98 | iprtd->periods = params_periods(params); |
Mark Brown | b4e82b5 | 2010-02-25 12:52:10 +0000 | [diff] [blame] | 99 | iprtd->period = params_period_bytes(params) ; |
Sascha Hauer | 8380222 | 2009-11-25 16:41:04 +0100 | [diff] [blame] | 100 | iprtd->offset = 0; |
Mark Brown | b4e82b5 | 2010-02-25 12:52:10 +0000 | [diff] [blame] | 101 | iprtd->last_offset = 0; |
Sascha Hauer | 43a3cec | 2010-04-08 11:31:26 +0200 | [diff] [blame] | 102 | iprtd->poll_time_ns = 1000000000 / params_rate(params) * |
| 103 | params_period_size(params); |
Sascha Hauer | 8380222 | 2009-11-25 16:41:04 +0100 | [diff] [blame] | 104 | snd_pcm_set_runtime_buffer(substream, &substream->dma_buffer); |
| 105 | |
| 106 | return 0; |
| 107 | } |
| 108 | |
| 109 | static int snd_imx_pcm_prepare(struct snd_pcm_substream *substream) |
| 110 | { |
| 111 | struct snd_pcm_runtime *runtime = substream->runtime; |
| 112 | struct imx_pcm_runtime_data *iprtd = runtime->private_data; |
| 113 | struct pt_regs regs; |
| 114 | |
| 115 | get_fiq_regs(®s); |
| 116 | if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) |
| 117 | regs.ARM_r8 = (iprtd->period * iprtd->periods - 1) << 16; |
| 118 | else |
| 119 | regs.ARM_r9 = (iprtd->period * iprtd->periods - 1) << 16; |
| 120 | |
| 121 | set_fiq_regs(®s); |
| 122 | |
| 123 | return 0; |
| 124 | } |
| 125 | |
| 126 | static int fiq_enable; |
| 127 | static int imx_pcm_fiq; |
| 128 | |
| 129 | static int snd_imx_pcm_trigger(struct snd_pcm_substream *substream, int cmd) |
| 130 | { |
| 131 | struct snd_pcm_runtime *runtime = substream->runtime; |
| 132 | struct imx_pcm_runtime_data *iprtd = runtime->private_data; |
| 133 | |
| 134 | switch (cmd) { |
| 135 | case SNDRV_PCM_TRIGGER_START: |
| 136 | case SNDRV_PCM_TRIGGER_RESUME: |
| 137 | case SNDRV_PCM_TRIGGER_PAUSE_RELEASE: |
Sascha Hauer | 8392609 | 2010-04-14 09:17:30 +0200 | [diff] [blame] | 138 | atomic_set(&iprtd->running, 1); |
Sascha Hauer | 43a3cec | 2010-04-08 11:31:26 +0200 | [diff] [blame] | 139 | hrtimer_start(&iprtd->hrt, ns_to_ktime(iprtd->poll_time_ns), |
| 140 | HRTIMER_MODE_REL); |
Sascha Hauer | 8380222 | 2009-11-25 16:41:04 +0100 | [diff] [blame] | 141 | if (++fiq_enable == 1) |
| 142 | enable_fiq(imx_pcm_fiq); |
| 143 | |
| 144 | break; |
| 145 | |
| 146 | case SNDRV_PCM_TRIGGER_STOP: |
| 147 | case SNDRV_PCM_TRIGGER_SUSPEND: |
| 148 | case SNDRV_PCM_TRIGGER_PAUSE_PUSH: |
Sascha Hauer | 8392609 | 2010-04-14 09:17:30 +0200 | [diff] [blame] | 149 | atomic_set(&iprtd->running, 0); |
| 150 | |
Sascha Hauer | 8380222 | 2009-11-25 16:41:04 +0100 | [diff] [blame] | 151 | if (--fiq_enable == 0) |
| 152 | disable_fiq(imx_pcm_fiq); |
| 153 | |
Sascha Hauer | 8380222 | 2009-11-25 16:41:04 +0100 | [diff] [blame] | 154 | break; |
| 155 | default: |
| 156 | return -EINVAL; |
| 157 | } |
| 158 | |
| 159 | return 0; |
| 160 | } |
| 161 | |
| 162 | static snd_pcm_uframes_t snd_imx_pcm_pointer(struct snd_pcm_substream *substream) |
| 163 | { |
| 164 | struct snd_pcm_runtime *runtime = substream->runtime; |
| 165 | struct imx_pcm_runtime_data *iprtd = runtime->private_data; |
| 166 | |
| 167 | return bytes_to_frames(substream->runtime, iprtd->offset); |
| 168 | } |
| 169 | |
| 170 | static struct snd_pcm_hardware snd_imx_hardware = { |
| 171 | .info = SNDRV_PCM_INFO_INTERLEAVED | |
| 172 | SNDRV_PCM_INFO_BLOCK_TRANSFER | |
| 173 | SNDRV_PCM_INFO_MMAP | |
| 174 | SNDRV_PCM_INFO_MMAP_VALID | |
| 175 | SNDRV_PCM_INFO_PAUSE | |
| 176 | SNDRV_PCM_INFO_RESUME, |
| 177 | .formats = SNDRV_PCM_FMTBIT_S16_LE, |
| 178 | .rate_min = 8000, |
| 179 | .channels_min = 2, |
| 180 | .channels_max = 2, |
| 181 | .buffer_bytes_max = IMX_SSI_DMABUF_SIZE, |
| 182 | .period_bytes_min = 128, |
| 183 | .period_bytes_max = 16 * 1024, |
Sascha Hauer | 565a79f | 2010-04-14 09:17:31 +0200 | [diff] [blame] | 184 | .periods_min = 4, |
Sascha Hauer | 8380222 | 2009-11-25 16:41:04 +0100 | [diff] [blame] | 185 | .periods_max = 255, |
| 186 | .fifo_size = 0, |
| 187 | }; |
| 188 | |
| 189 | static int snd_imx_open(struct snd_pcm_substream *substream) |
| 190 | { |
| 191 | struct snd_pcm_runtime *runtime = substream->runtime; |
| 192 | struct imx_pcm_runtime_data *iprtd; |
| 193 | int ret; |
| 194 | |
| 195 | iprtd = kzalloc(sizeof(*iprtd), GFP_KERNEL); |
Kulikov Vasiliy | 50e8ce1 | 2010-07-16 20:16:54 +0400 | [diff] [blame] | 196 | if (iprtd == NULL) |
| 197 | return -ENOMEM; |
Sascha Hauer | 8380222 | 2009-11-25 16:41:04 +0100 | [diff] [blame] | 198 | runtime->private_data = iprtd; |
| 199 | |
Sascha Hauer | 43a3cec | 2010-04-08 11:31:26 +0200 | [diff] [blame] | 200 | iprtd->substream = substream; |
| 201 | |
Sascha Hauer | 8392609 | 2010-04-14 09:17:30 +0200 | [diff] [blame] | 202 | atomic_set(&iprtd->running, 0); |
Sascha Hauer | 43a3cec | 2010-04-08 11:31:26 +0200 | [diff] [blame] | 203 | hrtimer_init(&iprtd->hrt, CLOCK_MONOTONIC, HRTIMER_MODE_REL); |
| 204 | iprtd->hrt.function = snd_hrtimer_callback; |
Sascha Hauer | 8380222 | 2009-11-25 16:41:04 +0100 | [diff] [blame] | 205 | |
| 206 | ret = snd_pcm_hw_constraint_integer(substream->runtime, |
| 207 | SNDRV_PCM_HW_PARAM_PERIODS); |
Kulikov Vasiliy | 50e8ce1 | 2010-07-16 20:16:54 +0400 | [diff] [blame] | 208 | if (ret < 0) { |
| 209 | kfree(iprtd); |
Sascha Hauer | 8380222 | 2009-11-25 16:41:04 +0100 | [diff] [blame] | 210 | return ret; |
Kulikov Vasiliy | 50e8ce1 | 2010-07-16 20:16:54 +0400 | [diff] [blame] | 211 | } |
Sascha Hauer | 8380222 | 2009-11-25 16:41:04 +0100 | [diff] [blame] | 212 | |
| 213 | snd_soc_set_runtime_hwparams(substream, &snd_imx_hardware); |
| 214 | return 0; |
| 215 | } |
| 216 | |
| 217 | static int snd_imx_close(struct snd_pcm_substream *substream) |
| 218 | { |
| 219 | struct snd_pcm_runtime *runtime = substream->runtime; |
| 220 | struct imx_pcm_runtime_data *iprtd = runtime->private_data; |
| 221 | |
Sascha Hauer | 43a3cec | 2010-04-08 11:31:26 +0200 | [diff] [blame] | 222 | hrtimer_cancel(&iprtd->hrt); |
| 223 | |
Sascha Hauer | 8380222 | 2009-11-25 16:41:04 +0100 | [diff] [blame] | 224 | kfree(iprtd); |
| 225 | |
| 226 | return 0; |
| 227 | } |
| 228 | |
| 229 | static struct snd_pcm_ops imx_pcm_ops = { |
| 230 | .open = snd_imx_open, |
| 231 | .close = snd_imx_close, |
| 232 | .ioctl = snd_pcm_lib_ioctl, |
| 233 | .hw_params = snd_imx_pcm_hw_params, |
| 234 | .prepare = snd_imx_pcm_prepare, |
| 235 | .trigger = snd_imx_pcm_trigger, |
| 236 | .pointer = snd_imx_pcm_pointer, |
| 237 | .mmap = snd_imx_pcm_mmap, |
| 238 | }; |
| 239 | |
Liam Girdwood | f0fba2a | 2010-03-17 20:15:21 +0000 | [diff] [blame] | 240 | static int ssi_irq = 0; |
| 241 | |
Liam Girdwood | 552d1ef | 2011-06-07 16:08:33 +0100 | [diff] [blame] | 242 | static int imx_pcm_fiq_new(struct snd_soc_pcm_runtime *rtd) |
Sascha Hauer | 8380222 | 2009-11-25 16:41:04 +0100 | [diff] [blame] | 243 | { |
Liam Girdwood | 552d1ef | 2011-06-07 16:08:33 +0100 | [diff] [blame] | 244 | struct snd_pcm *pcm = rtd->pcm; |
Wolfram Sang | 35dcf58 | 2011-08-25 15:54:56 +0200 | [diff] [blame] | 245 | struct snd_pcm_substream *substream; |
Sascha Hauer | 8380222 | 2009-11-25 16:41:04 +0100 | [diff] [blame] | 246 | int ret; |
| 247 | |
Liam Girdwood | 552d1ef | 2011-06-07 16:08:33 +0100 | [diff] [blame] | 248 | ret = imx_pcm_new(rtd); |
Sascha Hauer | 8380222 | 2009-11-25 16:41:04 +0100 | [diff] [blame] | 249 | if (ret) |
| 250 | return ret; |
| 251 | |
Wolfram Sang | 35dcf58 | 2011-08-25 15:54:56 +0200 | [diff] [blame] | 252 | substream = pcm->streams[SNDRV_PCM_STREAM_PLAYBACK].substream; |
| 253 | if (substream) { |
Sascha Hauer | 8380222 | 2009-11-25 16:41:04 +0100 | [diff] [blame] | 254 | struct snd_dma_buffer *buf = &substream->dma_buffer; |
| 255 | |
| 256 | imx_ssi_fiq_tx_buffer = (unsigned long)buf->area; |
| 257 | } |
| 258 | |
Wolfram Sang | 35dcf58 | 2011-08-25 15:54:56 +0200 | [diff] [blame] | 259 | substream = pcm->streams[SNDRV_PCM_STREAM_CAPTURE].substream; |
| 260 | if (substream) { |
Sascha Hauer | 8380222 | 2009-11-25 16:41:04 +0100 | [diff] [blame] | 261 | struct snd_dma_buffer *buf = &substream->dma_buffer; |
| 262 | |
| 263 | imx_ssi_fiq_rx_buffer = (unsigned long)buf->area; |
| 264 | } |
| 265 | |
| 266 | set_fiq_handler(&imx_ssi_fiq_start, |
| 267 | &imx_ssi_fiq_end - &imx_ssi_fiq_start); |
| 268 | |
| 269 | return 0; |
| 270 | } |
| 271 | |
Liam Girdwood | f0fba2a | 2010-03-17 20:15:21 +0000 | [diff] [blame] | 272 | static void imx_pcm_fiq_free(struct snd_pcm *pcm) |
| 273 | { |
| 274 | mxc_set_irq_fiq(ssi_irq, 0); |
| 275 | release_fiq(&fh); |
| 276 | imx_pcm_free(pcm); |
| 277 | } |
| 278 | |
| 279 | static struct snd_soc_platform_driver imx_soc_platform_fiq = { |
| 280 | .ops = &imx_pcm_ops, |
Sascha Hauer | 8380222 | 2009-11-25 16:41:04 +0100 | [diff] [blame] | 281 | .pcm_new = imx_pcm_fiq_new, |
Liam Girdwood | f0fba2a | 2010-03-17 20:15:21 +0000 | [diff] [blame] | 282 | .pcm_free = imx_pcm_fiq_free, |
Sascha Hauer | 8380222 | 2009-11-25 16:41:04 +0100 | [diff] [blame] | 283 | }; |
| 284 | |
Liam Girdwood | f0fba2a | 2010-03-17 20:15:21 +0000 | [diff] [blame] | 285 | static int __devinit imx_soc_platform_probe(struct platform_device *pdev) |
Sascha Hauer | 8380222 | 2009-11-25 16:41:04 +0100 | [diff] [blame] | 286 | { |
Liam Girdwood | f0fba2a | 2010-03-17 20:15:21 +0000 | [diff] [blame] | 287 | struct imx_ssi *ssi = platform_get_drvdata(pdev); |
| 288 | int ret; |
Sascha Hauer | 8380222 | 2009-11-25 16:41:04 +0100 | [diff] [blame] | 289 | |
| 290 | ret = claim_fiq(&fh); |
| 291 | if (ret) { |
| 292 | dev_err(&pdev->dev, "failed to claim fiq: %d", ret); |
Liam Girdwood | f0fba2a | 2010-03-17 20:15:21 +0000 | [diff] [blame] | 293 | return ret; |
Sascha Hauer | 8380222 | 2009-11-25 16:41:04 +0100 | [diff] [blame] | 294 | } |
| 295 | |
| 296 | mxc_set_irq_fiq(ssi->irq, 1); |
Liam Girdwood | f0fba2a | 2010-03-17 20:15:21 +0000 | [diff] [blame] | 297 | ssi_irq = ssi->irq; |
Sascha Hauer | 8380222 | 2009-11-25 16:41:04 +0100 | [diff] [blame] | 298 | |
| 299 | imx_pcm_fiq = ssi->irq; |
| 300 | |
| 301 | imx_ssi_fiq_base = (unsigned long)ssi->base; |
| 302 | |
| 303 | ssi->dma_params_tx.burstsize = 4; |
| 304 | ssi->dma_params_rx.burstsize = 6; |
| 305 | |
Liam Girdwood | f0fba2a | 2010-03-17 20:15:21 +0000 | [diff] [blame] | 306 | ret = snd_soc_register_platform(&pdev->dev, &imx_soc_platform_fiq); |
| 307 | if (ret) |
| 308 | goto failed_register; |
Sascha Hauer | 8380222 | 2009-11-25 16:41:04 +0100 | [diff] [blame] | 309 | |
Liam Girdwood | f0fba2a | 2010-03-17 20:15:21 +0000 | [diff] [blame] | 310 | return 0; |
| 311 | |
| 312 | failed_register: |
| 313 | mxc_set_irq_fiq(ssi_irq, 0); |
Sascha Hauer | 8380222 | 2009-11-25 16:41:04 +0100 | [diff] [blame] | 314 | release_fiq(&fh); |
Liam Girdwood | f0fba2a | 2010-03-17 20:15:21 +0000 | [diff] [blame] | 315 | |
| 316 | return ret; |
Sascha Hauer | 8380222 | 2009-11-25 16:41:04 +0100 | [diff] [blame] | 317 | } |
| 318 | |
Liam Girdwood | f0fba2a | 2010-03-17 20:15:21 +0000 | [diff] [blame] | 319 | static int __devexit imx_soc_platform_remove(struct platform_device *pdev) |
| 320 | { |
| 321 | snd_soc_unregister_platform(&pdev->dev); |
| 322 | return 0; |
| 323 | } |
| 324 | |
| 325 | static struct platform_driver imx_pcm_driver = { |
| 326 | .driver = { |
| 327 | .name = "imx-fiq-pcm-audio", |
| 328 | .owner = THIS_MODULE, |
| 329 | }, |
| 330 | |
| 331 | .probe = imx_soc_platform_probe, |
| 332 | .remove = __devexit_p(imx_soc_platform_remove), |
| 333 | }; |
| 334 | |
Axel Lin | 7a24b2b | 2011-11-24 15:03:50 +0800 | [diff] [blame] | 335 | module_platform_driver(imx_pcm_driver); |
Axel Lin | 0604ca4 | 2011-12-12 16:01:15 +0800 | [diff] [blame] | 336 | |
| 337 | MODULE_LICENSE("GPL"); |