Jon Smirl | 89dd084 | 2009-05-23 19:12:59 -0400 | [diff] [blame] | 1 | /* |
| 2 | * Freescale MPC5200 PSC DMA |
| 3 | * ALSA SoC Platform driver |
| 4 | * |
| 5 | * Copyright (C) 2008 Secret Lab Technologies Ltd. |
Jon Smirl | dbcc347 | 2009-05-26 08:34:08 -0400 | [diff] [blame] | 6 | * Copyright (C) 2009 Jon Smirl, Digispeaker |
Jon Smirl | 89dd084 | 2009-05-23 19:12:59 -0400 | [diff] [blame] | 7 | */ |
| 8 | |
Jon Smirl | 89dd084 | 2009-05-23 19:12:59 -0400 | [diff] [blame] | 9 | #include <linux/module.h> |
Jon Smirl | 89dd084 | 2009-05-23 19:12:59 -0400 | [diff] [blame] | 10 | #include <linux/of_device.h> |
Tejun Heo | 5a0e3ad | 2010-03-24 17:04:11 +0900 | [diff] [blame] | 11 | #include <linux/slab.h> |
Jon Smirl | 89dd084 | 2009-05-23 19:12:59 -0400 | [diff] [blame] | 12 | |
Jon Smirl | 89dd084 | 2009-05-23 19:12:59 -0400 | [diff] [blame] | 13 | #include <sound/soc.h> |
Jon Smirl | 89dd084 | 2009-05-23 19:12:59 -0400 | [diff] [blame] | 14 | |
| 15 | #include <sysdev/bestcomm/bestcomm.h> |
| 16 | #include <sysdev/bestcomm/gen_bd.h> |
| 17 | #include <asm/mpc52xx_psc.h> |
| 18 | |
| 19 | #include "mpc5200_dma.h" |
| 20 | |
Jon Smirl | 89dd084 | 2009-05-23 19:12:59 -0400 | [diff] [blame] | 21 | /* |
| 22 | * Interrupt handlers |
| 23 | */ |
Jon Smirl | cebe776 | 2009-05-23 19:13:01 -0400 | [diff] [blame] | 24 | static irqreturn_t psc_dma_status_irq(int irq, void *_psc_dma) |
Jon Smirl | 89dd084 | 2009-05-23 19:12:59 -0400 | [diff] [blame] | 25 | { |
Jon Smirl | cebe776 | 2009-05-23 19:13:01 -0400 | [diff] [blame] | 26 | struct psc_dma *psc_dma = _psc_dma; |
| 27 | struct mpc52xx_psc __iomem *regs = psc_dma->psc_regs; |
Jon Smirl | 89dd084 | 2009-05-23 19:12:59 -0400 | [diff] [blame] | 28 | u16 isr; |
| 29 | |
| 30 | isr = in_be16(®s->mpc52xx_psc_isr); |
| 31 | |
| 32 | /* Playback underrun error */ |
Jon Smirl | cebe776 | 2009-05-23 19:13:01 -0400 | [diff] [blame] | 33 | if (psc_dma->playback.active && (isr & MPC52xx_PSC_IMR_TXEMP)) |
| 34 | psc_dma->stats.underrun_count++; |
Jon Smirl | 89dd084 | 2009-05-23 19:12:59 -0400 | [diff] [blame] | 35 | |
| 36 | /* Capture overrun error */ |
Jon Smirl | cebe776 | 2009-05-23 19:13:01 -0400 | [diff] [blame] | 37 | if (psc_dma->capture.active && (isr & MPC52xx_PSC_IMR_ORERR)) |
| 38 | psc_dma->stats.overrun_count++; |
Jon Smirl | 89dd084 | 2009-05-23 19:12:59 -0400 | [diff] [blame] | 39 | |
Jon Smirl | dbcc347 | 2009-05-26 08:34:08 -0400 | [diff] [blame] | 40 | out_8(®s->command, MPC52xx_PSC_RST_ERR_STAT); |
Jon Smirl | 89dd084 | 2009-05-23 19:12:59 -0400 | [diff] [blame] | 41 | |
| 42 | return IRQ_HANDLED; |
| 43 | } |
| 44 | |
| 45 | /** |
Jon Smirl | cebe776 | 2009-05-23 19:13:01 -0400 | [diff] [blame] | 46 | * psc_dma_bcom_enqueue_next_buffer - Enqueue another audio buffer |
Jon Smirl | 89dd084 | 2009-05-23 19:12:59 -0400 | [diff] [blame] | 47 | * @s: pointer to stream private data structure |
| 48 | * |
| 49 | * Enqueues another audio period buffer into the bestcomm queue. |
| 50 | * |
| 51 | * Note: The routine must only be called when there is space available in |
| 52 | * the queue. Otherwise the enqueue will fail and the audio ring buffer |
| 53 | * will get out of sync |
| 54 | */ |
Jon Smirl | cebe776 | 2009-05-23 19:13:01 -0400 | [diff] [blame] | 55 | static void psc_dma_bcom_enqueue_next_buffer(struct psc_dma_stream *s) |
Jon Smirl | 89dd084 | 2009-05-23 19:12:59 -0400 | [diff] [blame] | 56 | { |
| 57 | struct bcom_bd *bd; |
| 58 | |
| 59 | /* Prepare and enqueue the next buffer descriptor */ |
| 60 | bd = bcom_prepare_next_buffer(s->bcom_task); |
| 61 | bd->status = s->period_bytes; |
Grant Likely | 8f159d7 | 2009-11-07 01:33:53 -0700 | [diff] [blame] | 62 | bd->data[0] = s->runtime->dma_addr + (s->period_next * s->period_bytes); |
Jon Smirl | 89dd084 | 2009-05-23 19:12:59 -0400 | [diff] [blame] | 63 | bcom_submit_next_buffer(s->bcom_task, NULL); |
| 64 | |
| 65 | /* Update for next period */ |
Grant Likely | 8f159d7 | 2009-11-07 01:33:53 -0700 | [diff] [blame] | 66 | s->period_next = (s->period_next + 1) % s->runtime->periods; |
Jon Smirl | 89dd084 | 2009-05-23 19:12:59 -0400 | [diff] [blame] | 67 | } |
| 68 | |
| 69 | /* Bestcomm DMA irq handler */ |
Grant Likely | a68cc8d | 2009-11-09 09:40:09 -0700 | [diff] [blame] | 70 | static irqreturn_t psc_dma_bcom_irq(int irq, void *_psc_dma_stream) |
Jon Smirl | 89dd084 | 2009-05-23 19:12:59 -0400 | [diff] [blame] | 71 | { |
Jon Smirl | dbcc347 | 2009-05-26 08:34:08 -0400 | [diff] [blame] | 72 | struct psc_dma_stream *s = _psc_dma_stream; |
Jon Smirl | 89dd084 | 2009-05-23 19:12:59 -0400 | [diff] [blame] | 73 | |
Jon Smirl | dbcc347 | 2009-05-26 08:34:08 -0400 | [diff] [blame] | 74 | spin_lock(&s->psc_dma->lock); |
| 75 | /* For each finished period, dequeue the completed period buffer |
| 76 | * and enqueue a new one in it's place. */ |
| 77 | while (bcom_buffer_done(s->bcom_task)) { |
| 78 | bcom_retrieve_buffer(s->bcom_task, NULL, NULL); |
Jon Smirl | 89dd084 | 2009-05-23 19:12:59 -0400 | [diff] [blame] | 79 | |
Grant Likely | 8f159d7 | 2009-11-07 01:33:53 -0700 | [diff] [blame] | 80 | s->period_current = (s->period_current+1) % s->runtime->periods; |
Grant Likely | c487827 | 2009-11-07 01:34:18 -0700 | [diff] [blame] | 81 | s->period_count++; |
Jon Smirl | dbcc347 | 2009-05-26 08:34:08 -0400 | [diff] [blame] | 82 | |
| 83 | psc_dma_bcom_enqueue_next_buffer(s); |
Jon Smirl | 89dd084 | 2009-05-23 19:12:59 -0400 | [diff] [blame] | 84 | } |
Jon Smirl | dbcc347 | 2009-05-26 08:34:08 -0400 | [diff] [blame] | 85 | spin_unlock(&s->psc_dma->lock); |
Jon Smirl | 89dd084 | 2009-05-23 19:12:59 -0400 | [diff] [blame] | 86 | |
Jon Smirl | dbcc347 | 2009-05-26 08:34:08 -0400 | [diff] [blame] | 87 | /* If the stream is active, then also inform the PCM middle layer |
| 88 | * of the period finished event. */ |
| 89 | if (s->active) |
| 90 | snd_pcm_period_elapsed(s->stream); |
| 91 | |
| 92 | return IRQ_HANDLED; |
Jon Smirl | 89dd084 | 2009-05-23 19:12:59 -0400 | [diff] [blame] | 93 | } |
| 94 | |
Jon Smirl | dbcc347 | 2009-05-26 08:34:08 -0400 | [diff] [blame] | 95 | static int psc_dma_hw_free(struct snd_pcm_substream *substream) |
Jon Smirl | 89dd084 | 2009-05-23 19:12:59 -0400 | [diff] [blame] | 96 | { |
| 97 | snd_pcm_set_runtime_buffer(substream, NULL); |
| 98 | return 0; |
| 99 | } |
| 100 | |
| 101 | /** |
Jon Smirl | cebe776 | 2009-05-23 19:13:01 -0400 | [diff] [blame] | 102 | * psc_dma_trigger: start and stop the DMA transfer. |
Jon Smirl | 89dd084 | 2009-05-23 19:12:59 -0400 | [diff] [blame] | 103 | * |
| 104 | * This function is called by ALSA to start, stop, pause, and resume the DMA |
| 105 | * transfer of data. |
| 106 | */ |
Jon Smirl | dbcc347 | 2009-05-26 08:34:08 -0400 | [diff] [blame] | 107 | static int psc_dma_trigger(struct snd_pcm_substream *substream, int cmd) |
Jon Smirl | 89dd084 | 2009-05-23 19:12:59 -0400 | [diff] [blame] | 108 | { |
| 109 | struct snd_soc_pcm_runtime *rtd = substream->private_data; |
Jon Smirl | cebe776 | 2009-05-23 19:13:01 -0400 | [diff] [blame] | 110 | struct psc_dma *psc_dma = rtd->dai->cpu_dai->private_data; |
Jon Smirl | 89dd084 | 2009-05-23 19:12:59 -0400 | [diff] [blame] | 111 | struct snd_pcm_runtime *runtime = substream->runtime; |
Grant Likely | 1d8222e | 2009-11-07 01:34:31 -0700 | [diff] [blame] | 112 | struct psc_dma_stream *s = to_psc_dma_stream(substream, psc_dma); |
Jon Smirl | cebe776 | 2009-05-23 19:13:01 -0400 | [diff] [blame] | 113 | struct mpc52xx_psc __iomem *regs = psc_dma->psc_regs; |
Jon Smirl | 89dd084 | 2009-05-23 19:12:59 -0400 | [diff] [blame] | 114 | u16 imr; |
Jon Smirl | 89dd084 | 2009-05-23 19:12:59 -0400 | [diff] [blame] | 115 | unsigned long flags; |
Jon Smirl | dbcc347 | 2009-05-26 08:34:08 -0400 | [diff] [blame] | 116 | int i; |
Jon Smirl | 89dd084 | 2009-05-23 19:12:59 -0400 | [diff] [blame] | 117 | |
Jon Smirl | 89dd084 | 2009-05-23 19:12:59 -0400 | [diff] [blame] | 118 | switch (cmd) { |
| 119 | case SNDRV_PCM_TRIGGER_START: |
Grant Likely | c487827 | 2009-11-07 01:34:18 -0700 | [diff] [blame] | 120 | dev_dbg(psc_dma->dev, "START: stream=%i fbits=%u ps=%u #p=%u\n", |
| 121 | substream->pstr->stream, runtime->frame_bits, |
| 122 | (int)runtime->period_size, runtime->periods); |
Jon Smirl | 89dd084 | 2009-05-23 19:12:59 -0400 | [diff] [blame] | 123 | s->period_bytes = frames_to_bytes(runtime, |
| 124 | runtime->period_size); |
Grant Likely | 8f159d7 | 2009-11-07 01:33:53 -0700 | [diff] [blame] | 125 | s->period_next = 0; |
| 126 | s->period_current = 0; |
Jon Smirl | 89dd084 | 2009-05-23 19:12:59 -0400 | [diff] [blame] | 127 | s->active = 1; |
Grant Likely | c487827 | 2009-11-07 01:34:18 -0700 | [diff] [blame] | 128 | s->period_count = 0; |
Jon Smirl | dbcc347 | 2009-05-26 08:34:08 -0400 | [diff] [blame] | 129 | s->runtime = runtime; |
Jon Smirl | dbcc347 | 2009-05-26 08:34:08 -0400 | [diff] [blame] | 130 | |
| 131 | /* Fill up the bestcomm bd queue and enable DMA. |
| 132 | * This will begin filling the PSC's fifo. |
| 133 | */ |
| 134 | spin_lock_irqsave(&psc_dma->lock, flags); |
| 135 | |
Grant Likely | d56b6eb | 2009-11-07 01:34:05 -0700 | [diff] [blame] | 136 | if (substream->pstr->stream == SNDRV_PCM_STREAM_CAPTURE) |
Jon Smirl | dbcc347 | 2009-05-26 08:34:08 -0400 | [diff] [blame] | 137 | bcom_gen_bd_rx_reset(s->bcom_task); |
Grant Likely | d56b6eb | 2009-11-07 01:34:05 -0700 | [diff] [blame] | 138 | else |
Jon Smirl | dbcc347 | 2009-05-26 08:34:08 -0400 | [diff] [blame] | 139 | bcom_gen_bd_tx_reset(s->bcom_task); |
Grant Likely | d56b6eb | 2009-11-07 01:34:05 -0700 | [diff] [blame] | 140 | |
| 141 | for (i = 0; i < runtime->periods; i++) |
| 142 | if (!bcom_queue_full(s->bcom_task)) |
| 143 | psc_dma_bcom_enqueue_next_buffer(s); |
Jon Smirl | 89dd084 | 2009-05-23 19:12:59 -0400 | [diff] [blame] | 144 | |
Jon Smirl | 89dd084 | 2009-05-23 19:12:59 -0400 | [diff] [blame] | 145 | bcom_enable(s->bcom_task); |
Jon Smirl | cebe776 | 2009-05-23 19:13:01 -0400 | [diff] [blame] | 146 | spin_unlock_irqrestore(&psc_dma->lock, flags); |
Jon Smirl | 89dd084 | 2009-05-23 19:12:59 -0400 | [diff] [blame] | 147 | |
Jon Smirl | dbcc347 | 2009-05-26 08:34:08 -0400 | [diff] [blame] | 148 | out_8(®s->command, MPC52xx_PSC_RST_ERR_STAT); |
| 149 | |
Jon Smirl | 89dd084 | 2009-05-23 19:12:59 -0400 | [diff] [blame] | 150 | break; |
| 151 | |
| 152 | case SNDRV_PCM_TRIGGER_STOP: |
Grant Likely | c487827 | 2009-11-07 01:34:18 -0700 | [diff] [blame] | 153 | dev_dbg(psc_dma->dev, "STOP: stream=%i periods_count=%i\n", |
| 154 | substream->pstr->stream, s->period_count); |
Jon Smirl | 89dd084 | 2009-05-23 19:12:59 -0400 | [diff] [blame] | 155 | s->active = 0; |
Jon Smirl | 89dd084 | 2009-05-23 19:12:59 -0400 | [diff] [blame] | 156 | |
Jon Smirl | dbcc347 | 2009-05-26 08:34:08 -0400 | [diff] [blame] | 157 | spin_lock_irqsave(&psc_dma->lock, flags); |
Jon Smirl | 89dd084 | 2009-05-23 19:12:59 -0400 | [diff] [blame] | 158 | bcom_disable(s->bcom_task); |
Jon Smirl | dbcc347 | 2009-05-26 08:34:08 -0400 | [diff] [blame] | 159 | if (substream->pstr->stream == SNDRV_PCM_STREAM_CAPTURE) |
| 160 | bcom_gen_bd_rx_reset(s->bcom_task); |
| 161 | else |
| 162 | bcom_gen_bd_tx_reset(s->bcom_task); |
| 163 | spin_unlock_irqrestore(&psc_dma->lock, flags); |
Jon Smirl | 89dd084 | 2009-05-23 19:12:59 -0400 | [diff] [blame] | 164 | |
| 165 | break; |
| 166 | |
| 167 | default: |
Grant Likely | c487827 | 2009-11-07 01:34:18 -0700 | [diff] [blame] | 168 | dev_dbg(psc_dma->dev, "unhandled trigger: stream=%i cmd=%i\n", |
| 169 | substream->pstr->stream, cmd); |
Jon Smirl | 89dd084 | 2009-05-23 19:12:59 -0400 | [diff] [blame] | 170 | return -EINVAL; |
| 171 | } |
| 172 | |
| 173 | /* Update interrupt enable settings */ |
| 174 | imr = 0; |
Jon Smirl | cebe776 | 2009-05-23 19:13:01 -0400 | [diff] [blame] | 175 | if (psc_dma->playback.active) |
Jon Smirl | 89dd084 | 2009-05-23 19:12:59 -0400 | [diff] [blame] | 176 | imr |= MPC52xx_PSC_IMR_TXEMP; |
Jon Smirl | cebe776 | 2009-05-23 19:13:01 -0400 | [diff] [blame] | 177 | if (psc_dma->capture.active) |
Jon Smirl | 89dd084 | 2009-05-23 19:12:59 -0400 | [diff] [blame] | 178 | imr |= MPC52xx_PSC_IMR_ORERR; |
Jon Smirl | dbcc347 | 2009-05-26 08:34:08 -0400 | [diff] [blame] | 179 | out_be16(®s->isr_imr.imr, psc_dma->imr | imr); |
Jon Smirl | 89dd084 | 2009-05-23 19:12:59 -0400 | [diff] [blame] | 180 | |
| 181 | return 0; |
| 182 | } |
| 183 | |
Jon Smirl | 89dd084 | 2009-05-23 19:12:59 -0400 | [diff] [blame] | 184 | |
| 185 | /* --------------------------------------------------------------------- |
| 186 | * The PSC DMA 'ASoC platform' driver |
| 187 | * |
| 188 | * Can be referenced by an 'ASoC machine' driver |
| 189 | * This driver only deals with the audio bus; it doesn't have any |
| 190 | * interaction with the attached codec |
| 191 | */ |
| 192 | |
Jon Smirl | dbcc347 | 2009-05-26 08:34:08 -0400 | [diff] [blame] | 193 | static const struct snd_pcm_hardware psc_dma_hardware = { |
Jon Smirl | 89dd084 | 2009-05-23 19:12:59 -0400 | [diff] [blame] | 194 | .info = SNDRV_PCM_INFO_MMAP | SNDRV_PCM_INFO_MMAP_VALID | |
| 195 | SNDRV_PCM_INFO_INTERLEAVED | SNDRV_PCM_INFO_BLOCK_TRANSFER | |
| 196 | SNDRV_PCM_INFO_BATCH, |
| 197 | .formats = SNDRV_PCM_FMTBIT_S8 | SNDRV_PCM_FMTBIT_S16_BE | |
Jon Smirl | dbcc347 | 2009-05-26 08:34:08 -0400 | [diff] [blame] | 198 | SNDRV_PCM_FMTBIT_S24_BE | SNDRV_PCM_FMTBIT_S32_BE, |
Jon Smirl | 89dd084 | 2009-05-23 19:12:59 -0400 | [diff] [blame] | 199 | .rate_min = 8000, |
| 200 | .rate_max = 48000, |
Jon Smirl | dbcc347 | 2009-05-26 08:34:08 -0400 | [diff] [blame] | 201 | .channels_min = 1, |
Jon Smirl | 89dd084 | 2009-05-23 19:12:59 -0400 | [diff] [blame] | 202 | .channels_max = 2, |
| 203 | .period_bytes_max = 1024 * 1024, |
| 204 | .period_bytes_min = 32, |
| 205 | .periods_min = 2, |
| 206 | .periods_max = 256, |
| 207 | .buffer_bytes_max = 2 * 1024 * 1024, |
Jon Smirl | dbcc347 | 2009-05-26 08:34:08 -0400 | [diff] [blame] | 208 | .fifo_size = 512, |
Jon Smirl | 89dd084 | 2009-05-23 19:12:59 -0400 | [diff] [blame] | 209 | }; |
| 210 | |
Jon Smirl | dbcc347 | 2009-05-26 08:34:08 -0400 | [diff] [blame] | 211 | static int psc_dma_open(struct snd_pcm_substream *substream) |
Jon Smirl | 89dd084 | 2009-05-23 19:12:59 -0400 | [diff] [blame] | 212 | { |
Jon Smirl | dbcc347 | 2009-05-26 08:34:08 -0400 | [diff] [blame] | 213 | struct snd_pcm_runtime *runtime = substream->runtime; |
Jon Smirl | 89dd084 | 2009-05-23 19:12:59 -0400 | [diff] [blame] | 214 | struct snd_soc_pcm_runtime *rtd = substream->private_data; |
Jon Smirl | cebe776 | 2009-05-23 19:13:01 -0400 | [diff] [blame] | 215 | struct psc_dma *psc_dma = rtd->dai->cpu_dai->private_data; |
| 216 | struct psc_dma_stream *s; |
Jon Smirl | dbcc347 | 2009-05-26 08:34:08 -0400 | [diff] [blame] | 217 | int rc; |
Jon Smirl | 89dd084 | 2009-05-23 19:12:59 -0400 | [diff] [blame] | 218 | |
Jon Smirl | dbcc347 | 2009-05-26 08:34:08 -0400 | [diff] [blame] | 219 | dev_dbg(psc_dma->dev, "psc_dma_open(substream=%p)\n", substream); |
Jon Smirl | 89dd084 | 2009-05-23 19:12:59 -0400 | [diff] [blame] | 220 | |
| 221 | if (substream->pstr->stream == SNDRV_PCM_STREAM_CAPTURE) |
Jon Smirl | cebe776 | 2009-05-23 19:13:01 -0400 | [diff] [blame] | 222 | s = &psc_dma->capture; |
Jon Smirl | 89dd084 | 2009-05-23 19:12:59 -0400 | [diff] [blame] | 223 | else |
Jon Smirl | cebe776 | 2009-05-23 19:13:01 -0400 | [diff] [blame] | 224 | s = &psc_dma->playback; |
Jon Smirl | 89dd084 | 2009-05-23 19:12:59 -0400 | [diff] [blame] | 225 | |
Jon Smirl | dbcc347 | 2009-05-26 08:34:08 -0400 | [diff] [blame] | 226 | snd_soc_set_runtime_hwparams(substream, &psc_dma_hardware); |
| 227 | |
| 228 | rc = snd_pcm_hw_constraint_integer(runtime, |
| 229 | SNDRV_PCM_HW_PARAM_PERIODS); |
| 230 | if (rc < 0) { |
| 231 | dev_err(substream->pcm->card->dev, "invalid buffer size\n"); |
| 232 | return rc; |
| 233 | } |
Jon Smirl | 89dd084 | 2009-05-23 19:12:59 -0400 | [diff] [blame] | 234 | |
| 235 | s->stream = substream; |
| 236 | return 0; |
| 237 | } |
| 238 | |
Jon Smirl | dbcc347 | 2009-05-26 08:34:08 -0400 | [diff] [blame] | 239 | static int psc_dma_close(struct snd_pcm_substream *substream) |
Jon Smirl | 89dd084 | 2009-05-23 19:12:59 -0400 | [diff] [blame] | 240 | { |
| 241 | struct snd_soc_pcm_runtime *rtd = substream->private_data; |
Jon Smirl | cebe776 | 2009-05-23 19:13:01 -0400 | [diff] [blame] | 242 | struct psc_dma *psc_dma = rtd->dai->cpu_dai->private_data; |
| 243 | struct psc_dma_stream *s; |
Jon Smirl | 89dd084 | 2009-05-23 19:12:59 -0400 | [diff] [blame] | 244 | |
Jon Smirl | dbcc347 | 2009-05-26 08:34:08 -0400 | [diff] [blame] | 245 | dev_dbg(psc_dma->dev, "psc_dma_close(substream=%p)\n", substream); |
Jon Smirl | 89dd084 | 2009-05-23 19:12:59 -0400 | [diff] [blame] | 246 | |
| 247 | if (substream->pstr->stream == SNDRV_PCM_STREAM_CAPTURE) |
Jon Smirl | cebe776 | 2009-05-23 19:13:01 -0400 | [diff] [blame] | 248 | s = &psc_dma->capture; |
Jon Smirl | 89dd084 | 2009-05-23 19:12:59 -0400 | [diff] [blame] | 249 | else |
Jon Smirl | cebe776 | 2009-05-23 19:13:01 -0400 | [diff] [blame] | 250 | s = &psc_dma->playback; |
Jon Smirl | 89dd084 | 2009-05-23 19:12:59 -0400 | [diff] [blame] | 251 | |
Jon Smirl | dbcc347 | 2009-05-26 08:34:08 -0400 | [diff] [blame] | 252 | if (!psc_dma->playback.active && |
| 253 | !psc_dma->capture.active) { |
| 254 | |
| 255 | /* Disable all interrupts and reset the PSC */ |
| 256 | out_be16(&psc_dma->psc_regs->isr_imr.imr, psc_dma->imr); |
| 257 | out_8(&psc_dma->psc_regs->command, 4 << 4); /* reset error */ |
| 258 | } |
Jon Smirl | 89dd084 | 2009-05-23 19:12:59 -0400 | [diff] [blame] | 259 | s->stream = NULL; |
| 260 | return 0; |
| 261 | } |
| 262 | |
| 263 | static snd_pcm_uframes_t |
Jon Smirl | dbcc347 | 2009-05-26 08:34:08 -0400 | [diff] [blame] | 264 | psc_dma_pointer(struct snd_pcm_substream *substream) |
Jon Smirl | 89dd084 | 2009-05-23 19:12:59 -0400 | [diff] [blame] | 265 | { |
| 266 | struct snd_soc_pcm_runtime *rtd = substream->private_data; |
Jon Smirl | cebe776 | 2009-05-23 19:13:01 -0400 | [diff] [blame] | 267 | struct psc_dma *psc_dma = rtd->dai->cpu_dai->private_data; |
| 268 | struct psc_dma_stream *s; |
Jon Smirl | 89dd084 | 2009-05-23 19:12:59 -0400 | [diff] [blame] | 269 | dma_addr_t count; |
| 270 | |
| 271 | if (substream->pstr->stream == SNDRV_PCM_STREAM_CAPTURE) |
Jon Smirl | cebe776 | 2009-05-23 19:13:01 -0400 | [diff] [blame] | 272 | s = &psc_dma->capture; |
Jon Smirl | 89dd084 | 2009-05-23 19:12:59 -0400 | [diff] [blame] | 273 | else |
Jon Smirl | cebe776 | 2009-05-23 19:13:01 -0400 | [diff] [blame] | 274 | s = &psc_dma->playback; |
Jon Smirl | 89dd084 | 2009-05-23 19:12:59 -0400 | [diff] [blame] | 275 | |
Grant Likely | 8f159d7 | 2009-11-07 01:33:53 -0700 | [diff] [blame] | 276 | count = s->period_current * s->period_bytes; |
Jon Smirl | 89dd084 | 2009-05-23 19:12:59 -0400 | [diff] [blame] | 277 | |
| 278 | return bytes_to_frames(substream->runtime, count); |
| 279 | } |
| 280 | |
Jon Smirl | dbcc347 | 2009-05-26 08:34:08 -0400 | [diff] [blame] | 281 | static int |
| 282 | psc_dma_hw_params(struct snd_pcm_substream *substream, |
| 283 | struct snd_pcm_hw_params *params) |
| 284 | { |
| 285 | snd_pcm_set_runtime_buffer(substream, &substream->dma_buffer); |
| 286 | |
| 287 | return 0; |
| 288 | } |
| 289 | |
| 290 | static struct snd_pcm_ops psc_dma_ops = { |
| 291 | .open = psc_dma_open, |
| 292 | .close = psc_dma_close, |
| 293 | .hw_free = psc_dma_hw_free, |
Jon Smirl | 89dd084 | 2009-05-23 19:12:59 -0400 | [diff] [blame] | 294 | .ioctl = snd_pcm_lib_ioctl, |
Jon Smirl | dbcc347 | 2009-05-26 08:34:08 -0400 | [diff] [blame] | 295 | .pointer = psc_dma_pointer, |
| 296 | .trigger = psc_dma_trigger, |
| 297 | .hw_params = psc_dma_hw_params, |
Jon Smirl | 89dd084 | 2009-05-23 19:12:59 -0400 | [diff] [blame] | 298 | }; |
| 299 | |
Jon Smirl | dbcc347 | 2009-05-26 08:34:08 -0400 | [diff] [blame] | 300 | static u64 psc_dma_dmamask = 0xffffffff; |
| 301 | static int psc_dma_new(struct snd_card *card, struct snd_soc_dai *dai, |
Jon Smirl | 89dd084 | 2009-05-23 19:12:59 -0400 | [diff] [blame] | 302 | struct snd_pcm *pcm) |
| 303 | { |
| 304 | struct snd_soc_pcm_runtime *rtd = pcm->private_data; |
Jon Smirl | dbcc347 | 2009-05-26 08:34:08 -0400 | [diff] [blame] | 305 | struct psc_dma *psc_dma = rtd->dai->cpu_dai->private_data; |
| 306 | size_t size = psc_dma_hardware.buffer_bytes_max; |
Jon Smirl | 89dd084 | 2009-05-23 19:12:59 -0400 | [diff] [blame] | 307 | int rc = 0; |
| 308 | |
Jon Smirl | dbcc347 | 2009-05-26 08:34:08 -0400 | [diff] [blame] | 309 | dev_dbg(rtd->socdev->dev, "psc_dma_new(card=%p, dai=%p, pcm=%p)\n", |
Jon Smirl | 89dd084 | 2009-05-23 19:12:59 -0400 | [diff] [blame] | 310 | card, dai, pcm); |
| 311 | |
| 312 | if (!card->dev->dma_mask) |
Jon Smirl | dbcc347 | 2009-05-26 08:34:08 -0400 | [diff] [blame] | 313 | card->dev->dma_mask = &psc_dma_dmamask; |
Jon Smirl | 89dd084 | 2009-05-23 19:12:59 -0400 | [diff] [blame] | 314 | if (!card->dev->coherent_dma_mask) |
| 315 | card->dev->coherent_dma_mask = 0xffffffff; |
| 316 | |
| 317 | if (pcm->streams[0].substream) { |
Jon Smirl | dbcc347 | 2009-05-26 08:34:08 -0400 | [diff] [blame] | 318 | rc = snd_dma_alloc_pages(SNDRV_DMA_TYPE_DEV, pcm->card->dev, |
| 319 | size, &pcm->streams[0].substream->dma_buffer); |
Jon Smirl | 89dd084 | 2009-05-23 19:12:59 -0400 | [diff] [blame] | 320 | if (rc) |
| 321 | goto playback_alloc_err; |
| 322 | } |
| 323 | |
| 324 | if (pcm->streams[1].substream) { |
Jon Smirl | dbcc347 | 2009-05-26 08:34:08 -0400 | [diff] [blame] | 325 | rc = snd_dma_alloc_pages(SNDRV_DMA_TYPE_DEV, pcm->card->dev, |
| 326 | size, &pcm->streams[1].substream->dma_buffer); |
Jon Smirl | 89dd084 | 2009-05-23 19:12:59 -0400 | [diff] [blame] | 327 | if (rc) |
| 328 | goto capture_alloc_err; |
| 329 | } |
| 330 | |
Jon Smirl | dbcc347 | 2009-05-26 08:34:08 -0400 | [diff] [blame] | 331 | if (rtd->socdev->card->codec->ac97) |
| 332 | rtd->socdev->card->codec->ac97->private_data = psc_dma; |
| 333 | |
Jon Smirl | 89dd084 | 2009-05-23 19:12:59 -0400 | [diff] [blame] | 334 | return 0; |
| 335 | |
| 336 | capture_alloc_err: |
| 337 | if (pcm->streams[0].substream) |
| 338 | snd_dma_free_pages(&pcm->streams[0].substream->dma_buffer); |
Jon Smirl | dbcc347 | 2009-05-26 08:34:08 -0400 | [diff] [blame] | 339 | |
Jon Smirl | 89dd084 | 2009-05-23 19:12:59 -0400 | [diff] [blame] | 340 | playback_alloc_err: |
| 341 | dev_err(card->dev, "Cannot allocate buffer(s)\n"); |
Jon Smirl | dbcc347 | 2009-05-26 08:34:08 -0400 | [diff] [blame] | 342 | |
Jon Smirl | 89dd084 | 2009-05-23 19:12:59 -0400 | [diff] [blame] | 343 | return -ENOMEM; |
| 344 | } |
| 345 | |
Jon Smirl | dbcc347 | 2009-05-26 08:34:08 -0400 | [diff] [blame] | 346 | static void psc_dma_free(struct snd_pcm *pcm) |
Jon Smirl | 89dd084 | 2009-05-23 19:12:59 -0400 | [diff] [blame] | 347 | { |
| 348 | struct snd_soc_pcm_runtime *rtd = pcm->private_data; |
| 349 | struct snd_pcm_substream *substream; |
| 350 | int stream; |
| 351 | |
Jon Smirl | dbcc347 | 2009-05-26 08:34:08 -0400 | [diff] [blame] | 352 | dev_dbg(rtd->socdev->dev, "psc_dma_free(pcm=%p)\n", pcm); |
Jon Smirl | 89dd084 | 2009-05-23 19:12:59 -0400 | [diff] [blame] | 353 | |
| 354 | for (stream = 0; stream < 2; stream++) { |
| 355 | substream = pcm->streams[stream].substream; |
| 356 | if (substream) { |
| 357 | snd_dma_free_pages(&substream->dma_buffer); |
| 358 | substream->dma_buffer.area = NULL; |
| 359 | substream->dma_buffer.addr = 0; |
| 360 | } |
| 361 | } |
| 362 | } |
| 363 | |
Jon Smirl | dbcc347 | 2009-05-26 08:34:08 -0400 | [diff] [blame] | 364 | struct snd_soc_platform mpc5200_audio_dma_platform = { |
Jon Smirl | 89dd084 | 2009-05-23 19:12:59 -0400 | [diff] [blame] | 365 | .name = "mpc5200-psc-audio", |
Jon Smirl | dbcc347 | 2009-05-26 08:34:08 -0400 | [diff] [blame] | 366 | .pcm_ops = &psc_dma_ops, |
| 367 | .pcm_new = &psc_dma_new, |
| 368 | .pcm_free = &psc_dma_free, |
Jon Smirl | 89dd084 | 2009-05-23 19:12:59 -0400 | [diff] [blame] | 369 | }; |
Jon Smirl | dbcc347 | 2009-05-26 08:34:08 -0400 | [diff] [blame] | 370 | EXPORT_SYMBOL_GPL(mpc5200_audio_dma_platform); |
Jon Smirl | 89dd084 | 2009-05-23 19:12:59 -0400 | [diff] [blame] | 371 | |
Jon Smirl | dbcc347 | 2009-05-26 08:34:08 -0400 | [diff] [blame] | 372 | int mpc5200_audio_dma_create(struct of_device *op) |
| 373 | { |
| 374 | phys_addr_t fifo; |
| 375 | struct psc_dma *psc_dma; |
| 376 | struct resource res; |
| 377 | int size, irq, rc; |
| 378 | const __be32 *prop; |
| 379 | void __iomem *regs; |
Julia Lawall | 33d7f77 | 2009-09-12 14:25:35 +0200 | [diff] [blame] | 380 | int ret; |
Jon Smirl | dbcc347 | 2009-05-26 08:34:08 -0400 | [diff] [blame] | 381 | |
| 382 | /* Fetch the registers and IRQ of the PSC */ |
Grant Likely | 61c7a08 | 2010-04-13 16:12:29 -0700 | [diff] [blame] | 383 | irq = irq_of_parse_and_map(op->dev.of_node, 0); |
| 384 | if (of_address_to_resource(op->dev.of_node, 0, &res)) { |
Jon Smirl | dbcc347 | 2009-05-26 08:34:08 -0400 | [diff] [blame] | 385 | dev_err(&op->dev, "Missing reg property\n"); |
| 386 | return -ENODEV; |
| 387 | } |
| 388 | regs = ioremap(res.start, 1 + res.end - res.start); |
| 389 | if (!regs) { |
| 390 | dev_err(&op->dev, "Could not map registers\n"); |
| 391 | return -ENODEV; |
| 392 | } |
| 393 | |
| 394 | /* Allocate and initialize the driver private data */ |
| 395 | psc_dma = kzalloc(sizeof *psc_dma, GFP_KERNEL); |
| 396 | if (!psc_dma) { |
Julia Lawall | 33d7f77 | 2009-09-12 14:25:35 +0200 | [diff] [blame] | 397 | ret = -ENOMEM; |
| 398 | goto out_unmap; |
Jon Smirl | dbcc347 | 2009-05-26 08:34:08 -0400 | [diff] [blame] | 399 | } |
| 400 | |
| 401 | /* Get the PSC ID */ |
Grant Likely | 61c7a08 | 2010-04-13 16:12:29 -0700 | [diff] [blame] | 402 | prop = of_get_property(op->dev.of_node, "cell-index", &size); |
Julia Lawall | 33d7f77 | 2009-09-12 14:25:35 +0200 | [diff] [blame] | 403 | if (!prop || size < sizeof *prop) { |
| 404 | ret = -ENODEV; |
| 405 | goto out_free; |
| 406 | } |
Jon Smirl | dbcc347 | 2009-05-26 08:34:08 -0400 | [diff] [blame] | 407 | |
| 408 | spin_lock_init(&psc_dma->lock); |
Grant Likely | 0827d6b | 2009-07-02 11:57:25 -0600 | [diff] [blame] | 409 | mutex_init(&psc_dma->mutex); |
Jon Smirl | dbcc347 | 2009-05-26 08:34:08 -0400 | [diff] [blame] | 410 | psc_dma->id = be32_to_cpu(*prop); |
| 411 | psc_dma->irq = irq; |
| 412 | psc_dma->psc_regs = regs; |
| 413 | psc_dma->fifo_regs = regs + sizeof *psc_dma->psc_regs; |
| 414 | psc_dma->dev = &op->dev; |
| 415 | psc_dma->playback.psc_dma = psc_dma; |
| 416 | psc_dma->capture.psc_dma = psc_dma; |
| 417 | snprintf(psc_dma->name, sizeof psc_dma->name, "PSC%u", psc_dma->id); |
| 418 | |
| 419 | /* Find the address of the fifo data registers and setup the |
| 420 | * DMA tasks */ |
| 421 | fifo = res.start + offsetof(struct mpc52xx_psc, buffer.buffer_32); |
| 422 | psc_dma->capture.bcom_task = |
| 423 | bcom_psc_gen_bd_rx_init(psc_dma->id, 10, fifo, 512); |
| 424 | psc_dma->playback.bcom_task = |
| 425 | bcom_psc_gen_bd_tx_init(psc_dma->id, 10, fifo); |
| 426 | if (!psc_dma->capture.bcom_task || |
| 427 | !psc_dma->playback.bcom_task) { |
| 428 | dev_err(&op->dev, "Could not allocate bestcomm tasks\n"); |
Julia Lawall | 33d7f77 | 2009-09-12 14:25:35 +0200 | [diff] [blame] | 429 | ret = -ENODEV; |
| 430 | goto out_free; |
Jon Smirl | dbcc347 | 2009-05-26 08:34:08 -0400 | [diff] [blame] | 431 | } |
| 432 | |
| 433 | /* Disable all interrupts and reset the PSC */ |
| 434 | out_be16(&psc_dma->psc_regs->isr_imr.imr, psc_dma->imr); |
| 435 | /* reset receiver */ |
| 436 | out_8(&psc_dma->psc_regs->command, MPC52xx_PSC_RST_RX); |
| 437 | /* reset transmitter */ |
| 438 | out_8(&psc_dma->psc_regs->command, MPC52xx_PSC_RST_TX); |
| 439 | /* reset error */ |
| 440 | out_8(&psc_dma->psc_regs->command, MPC52xx_PSC_RST_ERR_STAT); |
| 441 | /* reset mode */ |
| 442 | out_8(&psc_dma->psc_regs->command, MPC52xx_PSC_SEL_MODE_REG_1); |
| 443 | |
| 444 | /* Set up mode register; |
| 445 | * First write: RxRdy (FIFO Alarm) generates rx FIFO irq |
| 446 | * Second write: register Normal mode for non loopback |
| 447 | */ |
| 448 | out_8(&psc_dma->psc_regs->mode, 0); |
| 449 | out_8(&psc_dma->psc_regs->mode, 0); |
| 450 | |
| 451 | /* Set the TX and RX fifo alarm thresholds */ |
| 452 | out_be16(&psc_dma->fifo_regs->rfalarm, 0x100); |
| 453 | out_8(&psc_dma->fifo_regs->rfcntl, 0x4); |
| 454 | out_be16(&psc_dma->fifo_regs->tfalarm, 0x100); |
| 455 | out_8(&psc_dma->fifo_regs->tfcntl, 0x7); |
| 456 | |
| 457 | /* Lookup the IRQ numbers */ |
| 458 | psc_dma->playback.irq = |
| 459 | bcom_get_task_irq(psc_dma->playback.bcom_task); |
| 460 | psc_dma->capture.irq = |
| 461 | bcom_get_task_irq(psc_dma->capture.bcom_task); |
| 462 | |
| 463 | rc = request_irq(psc_dma->irq, &psc_dma_status_irq, IRQF_SHARED, |
| 464 | "psc-dma-status", psc_dma); |
Grant Likely | a68cc8d | 2009-11-09 09:40:09 -0700 | [diff] [blame] | 465 | rc |= request_irq(psc_dma->capture.irq, &psc_dma_bcom_irq, IRQF_SHARED, |
Jon Smirl | dbcc347 | 2009-05-26 08:34:08 -0400 | [diff] [blame] | 466 | "psc-dma-capture", &psc_dma->capture); |
Grant Likely | a68cc8d | 2009-11-09 09:40:09 -0700 | [diff] [blame] | 467 | rc |= request_irq(psc_dma->playback.irq, &psc_dma_bcom_irq, IRQF_SHARED, |
Jon Smirl | dbcc347 | 2009-05-26 08:34:08 -0400 | [diff] [blame] | 468 | "psc-dma-playback", &psc_dma->playback); |
| 469 | if (rc) { |
Julia Lawall | 33d7f77 | 2009-09-12 14:25:35 +0200 | [diff] [blame] | 470 | ret = -ENODEV; |
| 471 | goto out_irq; |
Jon Smirl | dbcc347 | 2009-05-26 08:34:08 -0400 | [diff] [blame] | 472 | } |
| 473 | |
| 474 | /* Save what we've done so it can be found again later */ |
| 475 | dev_set_drvdata(&op->dev, psc_dma); |
| 476 | |
| 477 | /* Tell the ASoC OF helpers about it */ |
| 478 | return snd_soc_register_platform(&mpc5200_audio_dma_platform); |
Julia Lawall | 33d7f77 | 2009-09-12 14:25:35 +0200 | [diff] [blame] | 479 | out_irq: |
| 480 | free_irq(psc_dma->irq, psc_dma); |
| 481 | free_irq(psc_dma->capture.irq, &psc_dma->capture); |
| 482 | free_irq(psc_dma->playback.irq, &psc_dma->playback); |
| 483 | out_free: |
| 484 | kfree(psc_dma); |
| 485 | out_unmap: |
| 486 | iounmap(regs); |
| 487 | return ret; |
Jon Smirl | dbcc347 | 2009-05-26 08:34:08 -0400 | [diff] [blame] | 488 | } |
| 489 | EXPORT_SYMBOL_GPL(mpc5200_audio_dma_create); |
| 490 | |
| 491 | int mpc5200_audio_dma_destroy(struct of_device *op) |
| 492 | { |
| 493 | struct psc_dma *psc_dma = dev_get_drvdata(&op->dev); |
| 494 | |
| 495 | dev_dbg(&op->dev, "mpc5200_audio_dma_destroy()\n"); |
| 496 | |
| 497 | snd_soc_unregister_platform(&mpc5200_audio_dma_platform); |
| 498 | |
| 499 | bcom_gen_bd_rx_release(psc_dma->capture.bcom_task); |
| 500 | bcom_gen_bd_tx_release(psc_dma->playback.bcom_task); |
| 501 | |
| 502 | /* Release irqs */ |
| 503 | free_irq(psc_dma->irq, psc_dma); |
| 504 | free_irq(psc_dma->capture.irq, &psc_dma->capture); |
| 505 | free_irq(psc_dma->playback.irq, &psc_dma->playback); |
| 506 | |
| 507 | iounmap(psc_dma->psc_regs); |
| 508 | kfree(psc_dma); |
| 509 | dev_set_drvdata(&op->dev, NULL); |
| 510 | |
| 511 | return 0; |
| 512 | } |
| 513 | EXPORT_SYMBOL_GPL(mpc5200_audio_dma_destroy); |
| 514 | |
| 515 | MODULE_AUTHOR("Grant Likely <grant.likely@secretlab.ca>"); |
| 516 | MODULE_DESCRIPTION("Freescale MPC5200 PSC in DMA mode ASoC Driver"); |
| 517 | MODULE_LICENSE("GPL"); |