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> |
| 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; |
| 38 | unsigned long dma_addr; |
| 39 | int dma; |
| 40 | unsigned long offset; |
| 41 | unsigned long size; |
| 42 | unsigned long period_cnt; |
| 43 | void *buf; |
| 44 | struct timer_list timer; |
| 45 | int period_time; |
| 46 | }; |
| 47 | |
| 48 | static void imx_ssi_timer_callback(unsigned long data) |
| 49 | { |
| 50 | struct snd_pcm_substream *substream = (void *)data; |
| 51 | struct snd_pcm_runtime *runtime = substream->runtime; |
| 52 | struct imx_pcm_runtime_data *iprtd = runtime->private_data; |
| 53 | struct pt_regs regs; |
| 54 | |
| 55 | get_fiq_regs(®s); |
| 56 | |
| 57 | if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) |
| 58 | iprtd->offset = regs.ARM_r8 & 0xffff; |
| 59 | else |
| 60 | iprtd->offset = regs.ARM_r9 & 0xffff; |
| 61 | |
| 62 | iprtd->timer.expires = jiffies + iprtd->period_time; |
| 63 | add_timer(&iprtd->timer); |
| 64 | snd_pcm_period_elapsed(substream); |
| 65 | } |
| 66 | |
| 67 | static struct fiq_handler fh = { |
| 68 | .name = DRV_NAME, |
| 69 | }; |
| 70 | |
| 71 | static int snd_imx_pcm_hw_params(struct snd_pcm_substream *substream, |
| 72 | struct snd_pcm_hw_params *params) |
| 73 | { |
| 74 | struct snd_pcm_runtime *runtime = substream->runtime; |
| 75 | struct imx_pcm_runtime_data *iprtd = runtime->private_data; |
| 76 | |
| 77 | iprtd->size = params_buffer_bytes(params); |
| 78 | iprtd->periods = params_periods(params); |
| 79 | iprtd->period = params_period_bytes(params); |
| 80 | iprtd->offset = 0; |
| 81 | iprtd->period_time = HZ / (params_rate(params) / params_period_size(params)); |
| 82 | |
| 83 | snd_pcm_set_runtime_buffer(substream, &substream->dma_buffer); |
| 84 | |
| 85 | return 0; |
| 86 | } |
| 87 | |
| 88 | static int snd_imx_pcm_prepare(struct snd_pcm_substream *substream) |
| 89 | { |
| 90 | struct snd_pcm_runtime *runtime = substream->runtime; |
| 91 | struct imx_pcm_runtime_data *iprtd = runtime->private_data; |
| 92 | struct pt_regs regs; |
| 93 | |
| 94 | get_fiq_regs(®s); |
| 95 | if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) |
| 96 | regs.ARM_r8 = (iprtd->period * iprtd->periods - 1) << 16; |
| 97 | else |
| 98 | regs.ARM_r9 = (iprtd->period * iprtd->periods - 1) << 16; |
| 99 | |
| 100 | set_fiq_regs(®s); |
| 101 | |
| 102 | return 0; |
| 103 | } |
| 104 | |
| 105 | static int fiq_enable; |
| 106 | static int imx_pcm_fiq; |
| 107 | |
| 108 | static int snd_imx_pcm_trigger(struct snd_pcm_substream *substream, int cmd) |
| 109 | { |
| 110 | struct snd_pcm_runtime *runtime = substream->runtime; |
| 111 | struct imx_pcm_runtime_data *iprtd = runtime->private_data; |
| 112 | |
| 113 | switch (cmd) { |
| 114 | case SNDRV_PCM_TRIGGER_START: |
| 115 | case SNDRV_PCM_TRIGGER_RESUME: |
| 116 | case SNDRV_PCM_TRIGGER_PAUSE_RELEASE: |
| 117 | iprtd->timer.expires = jiffies + iprtd->period_time; |
| 118 | add_timer(&iprtd->timer); |
| 119 | if (++fiq_enable == 1) |
| 120 | enable_fiq(imx_pcm_fiq); |
| 121 | |
| 122 | break; |
| 123 | |
| 124 | case SNDRV_PCM_TRIGGER_STOP: |
| 125 | case SNDRV_PCM_TRIGGER_SUSPEND: |
| 126 | case SNDRV_PCM_TRIGGER_PAUSE_PUSH: |
| 127 | del_timer(&iprtd->timer); |
| 128 | if (--fiq_enable == 0) |
| 129 | disable_fiq(imx_pcm_fiq); |
| 130 | |
| 131 | |
| 132 | break; |
| 133 | default: |
| 134 | return -EINVAL; |
| 135 | } |
| 136 | |
| 137 | return 0; |
| 138 | } |
| 139 | |
| 140 | static snd_pcm_uframes_t snd_imx_pcm_pointer(struct snd_pcm_substream *substream) |
| 141 | { |
| 142 | struct snd_pcm_runtime *runtime = substream->runtime; |
| 143 | struct imx_pcm_runtime_data *iprtd = runtime->private_data; |
| 144 | |
| 145 | return bytes_to_frames(substream->runtime, iprtd->offset); |
| 146 | } |
| 147 | |
| 148 | static struct snd_pcm_hardware snd_imx_hardware = { |
| 149 | .info = SNDRV_PCM_INFO_INTERLEAVED | |
| 150 | SNDRV_PCM_INFO_BLOCK_TRANSFER | |
| 151 | SNDRV_PCM_INFO_MMAP | |
| 152 | SNDRV_PCM_INFO_MMAP_VALID | |
| 153 | SNDRV_PCM_INFO_PAUSE | |
| 154 | SNDRV_PCM_INFO_RESUME, |
| 155 | .formats = SNDRV_PCM_FMTBIT_S16_LE, |
| 156 | .rate_min = 8000, |
| 157 | .channels_min = 2, |
| 158 | .channels_max = 2, |
| 159 | .buffer_bytes_max = IMX_SSI_DMABUF_SIZE, |
| 160 | .period_bytes_min = 128, |
| 161 | .period_bytes_max = 16 * 1024, |
| 162 | .periods_min = 2, |
| 163 | .periods_max = 255, |
| 164 | .fifo_size = 0, |
| 165 | }; |
| 166 | |
| 167 | static int snd_imx_open(struct snd_pcm_substream *substream) |
| 168 | { |
| 169 | struct snd_pcm_runtime *runtime = substream->runtime; |
| 170 | struct imx_pcm_runtime_data *iprtd; |
| 171 | int ret; |
| 172 | |
| 173 | iprtd = kzalloc(sizeof(*iprtd), GFP_KERNEL); |
| 174 | runtime->private_data = iprtd; |
| 175 | |
| 176 | init_timer(&iprtd->timer); |
| 177 | iprtd->timer.data = (unsigned long)substream; |
| 178 | iprtd->timer.function = imx_ssi_timer_callback; |
| 179 | |
| 180 | ret = snd_pcm_hw_constraint_integer(substream->runtime, |
| 181 | SNDRV_PCM_HW_PARAM_PERIODS); |
| 182 | if (ret < 0) |
| 183 | return ret; |
| 184 | |
| 185 | snd_soc_set_runtime_hwparams(substream, &snd_imx_hardware); |
| 186 | return 0; |
| 187 | } |
| 188 | |
| 189 | static int snd_imx_close(struct snd_pcm_substream *substream) |
| 190 | { |
| 191 | struct snd_pcm_runtime *runtime = substream->runtime; |
| 192 | struct imx_pcm_runtime_data *iprtd = runtime->private_data; |
| 193 | |
| 194 | del_timer_sync(&iprtd->timer); |
| 195 | kfree(iprtd); |
| 196 | |
| 197 | return 0; |
| 198 | } |
| 199 | |
| 200 | static struct snd_pcm_ops imx_pcm_ops = { |
| 201 | .open = snd_imx_open, |
| 202 | .close = snd_imx_close, |
| 203 | .ioctl = snd_pcm_lib_ioctl, |
| 204 | .hw_params = snd_imx_pcm_hw_params, |
| 205 | .prepare = snd_imx_pcm_prepare, |
| 206 | .trigger = snd_imx_pcm_trigger, |
| 207 | .pointer = snd_imx_pcm_pointer, |
| 208 | .mmap = snd_imx_pcm_mmap, |
| 209 | }; |
| 210 | |
| 211 | static int imx_pcm_fiq_new(struct snd_card *card, struct snd_soc_dai *dai, |
| 212 | struct snd_pcm *pcm) |
| 213 | { |
| 214 | int ret; |
| 215 | |
| 216 | ret = imx_pcm_new(card, dai, pcm); |
| 217 | if (ret) |
| 218 | return ret; |
| 219 | |
| 220 | if (dai->playback.channels_min) { |
| 221 | struct snd_pcm_substream *substream = |
| 222 | pcm->streams[SNDRV_PCM_STREAM_PLAYBACK].substream; |
| 223 | struct snd_dma_buffer *buf = &substream->dma_buffer; |
| 224 | |
| 225 | imx_ssi_fiq_tx_buffer = (unsigned long)buf->area; |
| 226 | } |
| 227 | |
| 228 | if (dai->capture.channels_min) { |
| 229 | struct snd_pcm_substream *substream = |
| 230 | pcm->streams[SNDRV_PCM_STREAM_CAPTURE].substream; |
| 231 | struct snd_dma_buffer *buf = &substream->dma_buffer; |
| 232 | |
| 233 | imx_ssi_fiq_rx_buffer = (unsigned long)buf->area; |
| 234 | } |
| 235 | |
| 236 | set_fiq_handler(&imx_ssi_fiq_start, |
| 237 | &imx_ssi_fiq_end - &imx_ssi_fiq_start); |
| 238 | |
| 239 | return 0; |
| 240 | } |
| 241 | |
| 242 | static struct snd_soc_platform imx_soc_platform_fiq = { |
| 243 | .pcm_ops = &imx_pcm_ops, |
| 244 | .pcm_new = imx_pcm_fiq_new, |
| 245 | .pcm_free = imx_pcm_free, |
| 246 | }; |
| 247 | |
| 248 | struct snd_soc_platform *imx_ssi_fiq_init(struct platform_device *pdev, |
| 249 | struct imx_ssi *ssi) |
| 250 | { |
| 251 | int ret = 0; |
| 252 | |
| 253 | ret = claim_fiq(&fh); |
| 254 | if (ret) { |
| 255 | dev_err(&pdev->dev, "failed to claim fiq: %d", ret); |
| 256 | return ERR_PTR(ret); |
| 257 | } |
| 258 | |
| 259 | mxc_set_irq_fiq(ssi->irq, 1); |
| 260 | |
| 261 | imx_pcm_fiq = ssi->irq; |
| 262 | |
| 263 | imx_ssi_fiq_base = (unsigned long)ssi->base; |
| 264 | |
| 265 | ssi->dma_params_tx.burstsize = 4; |
| 266 | ssi->dma_params_rx.burstsize = 6; |
| 267 | |
| 268 | return &imx_soc_platform_fiq; |
| 269 | } |
| 270 | |
| 271 | void imx_ssi_fiq_exit(struct platform_device *pdev, |
| 272 | struct imx_ssi *ssi) |
| 273 | { |
| 274 | mxc_set_irq_fiq(ssi->irq, 0); |
| 275 | release_fiq(&fh); |
| 276 | } |
| 277 | |