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TOMOYO Linux Cross Reference
Linux/sound/soc/fsl/mpc5200_dma.c

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Diff markup

Differences between /sound/soc/fsl/mpc5200_dma.c (Architecture sparc64) and /sound/soc/fsl/mpc5200_dma.c (Architecture sparc)


  1 /*                                                  1 /*
  2  * Freescale MPC5200 PSC DMA                        2  * Freescale MPC5200 PSC DMA
  3  * ALSA SoC Platform driver                         3  * ALSA SoC Platform driver
  4  *                                                  4  *
  5  * Copyright (C) 2008 Secret Lab Technologies       5  * Copyright (C) 2008 Secret Lab Technologies Ltd.
  6  * Copyright (C) 2009 Jon Smirl, Digispeaker        6  * Copyright (C) 2009 Jon Smirl, Digispeaker
  7  */                                                 7  */
  8                                                     8 
  9 #include <linux/module.h>                           9 #include <linux/module.h>
 10 #include <linux/of_device.h>                       10 #include <linux/of_device.h>
 11 #include <linux/dma-mapping.h>                     11 #include <linux/dma-mapping.h>
 12 #include <linux/slab.h>                            12 #include <linux/slab.h>
 13 #include <linux/of_address.h>                      13 #include <linux/of_address.h>
 14 #include <linux/of_irq.h>                          14 #include <linux/of_irq.h>
 15 #include <linux/of_platform.h>                     15 #include <linux/of_platform.h>
 16                                                    16 
 17 #include <sound/soc.h>                             17 #include <sound/soc.h>
 18                                                    18 
 19 #include <linux/fsl/bestcomm/bestcomm.h>           19 #include <linux/fsl/bestcomm/bestcomm.h>
 20 #include <linux/fsl/bestcomm/gen_bd.h>             20 #include <linux/fsl/bestcomm/gen_bd.h>
 21 #include <asm/mpc52xx_psc.h>                       21 #include <asm/mpc52xx_psc.h>
 22                                                    22 
 23 #include "mpc5200_dma.h"                           23 #include "mpc5200_dma.h"
 24                                                    24 
 25 /*                                                 25 /*
 26  * Interrupt handlers                              26  * Interrupt handlers
 27  */                                                27  */
 28 static irqreturn_t psc_dma_status_irq(int irq,     28 static irqreturn_t psc_dma_status_irq(int irq, void *_psc_dma)
 29 {                                                  29 {
 30         struct psc_dma *psc_dma = _psc_dma;        30         struct psc_dma *psc_dma = _psc_dma;
 31         struct mpc52xx_psc __iomem *regs = psc     31         struct mpc52xx_psc __iomem *regs = psc_dma->psc_regs;
 32         u16 isr;                                   32         u16 isr;
 33                                                    33 
 34         isr = in_be16(&regs->mpc52xx_psc_isr);     34         isr = in_be16(&regs->mpc52xx_psc_isr);
 35                                                    35 
 36         /* Playback underrun error */              36         /* Playback underrun error */
 37         if (psc_dma->playback.active && (isr &     37         if (psc_dma->playback.active && (isr & MPC52xx_PSC_IMR_TXEMP))
 38                 psc_dma->stats.underrun_count+     38                 psc_dma->stats.underrun_count++;
 39                                                    39 
 40         /* Capture overrun error */                40         /* Capture overrun error */
 41         if (psc_dma->capture.active && (isr &      41         if (psc_dma->capture.active && (isr & MPC52xx_PSC_IMR_ORERR))
 42                 psc_dma->stats.overrun_count++     42                 psc_dma->stats.overrun_count++;
 43                                                    43 
 44         out_8(&regs->command, MPC52xx_PSC_RST_     44         out_8(&regs->command, MPC52xx_PSC_RST_ERR_STAT);
 45                                                    45 
 46         return IRQ_HANDLED;                        46         return IRQ_HANDLED;
 47 }                                                  47 }
 48                                                    48 
 49 /**                                                49 /**
 50  * psc_dma_bcom_enqueue_next_buffer - Enqueue      50  * psc_dma_bcom_enqueue_next_buffer - Enqueue another audio buffer
 51  * @s: pointer to stream private data structur     51  * @s: pointer to stream private data structure
 52  *                                                 52  *
 53  * Enqueues another audio period buffer into t     53  * Enqueues another audio period buffer into the bestcomm queue.
 54  *                                                 54  *
 55  * Note: The routine must only be called when      55  * Note: The routine must only be called when there is space available in
 56  * the queue.  Otherwise the enqueue will fail     56  * the queue.  Otherwise the enqueue will fail and the audio ring buffer
 57  * will get out of sync                            57  * will get out of sync
 58  */                                                58  */
 59 static void psc_dma_bcom_enqueue_next_buffer(s     59 static void psc_dma_bcom_enqueue_next_buffer(struct psc_dma_stream *s)
 60 {                                                  60 {
 61         struct bcom_bd *bd;                        61         struct bcom_bd *bd;
 62                                                    62 
 63         /* Prepare and enqueue the next buffer     63         /* Prepare and enqueue the next buffer descriptor */
 64         bd = bcom_prepare_next_buffer(s->bcom_     64         bd = bcom_prepare_next_buffer(s->bcom_task);
 65         bd->status = s->period_bytes;              65         bd->status = s->period_bytes;
 66         bd->data[0] = s->runtime->dma_addr + (     66         bd->data[0] = s->runtime->dma_addr + (s->period_next * s->period_bytes);
 67         bcom_submit_next_buffer(s->bcom_task,      67         bcom_submit_next_buffer(s->bcom_task, NULL);
 68                                                    68 
 69         /* Update for next period */               69         /* Update for next period */
 70         s->period_next = (s->period_next + 1)      70         s->period_next = (s->period_next + 1) % s->runtime->periods;
 71 }                                                  71 }
 72                                                    72 
 73 /* Bestcomm DMA irq handler */                     73 /* Bestcomm DMA irq handler */
 74 static irqreturn_t psc_dma_bcom_irq(int irq, v     74 static irqreturn_t psc_dma_bcom_irq(int irq, void *_psc_dma_stream)
 75 {                                                  75 {
 76         struct psc_dma_stream *s = _psc_dma_st     76         struct psc_dma_stream *s = _psc_dma_stream;
 77                                                    77 
 78         spin_lock(&s->psc_dma->lock);              78         spin_lock(&s->psc_dma->lock);
 79         /* For each finished period, dequeue t     79         /* For each finished period, dequeue the completed period buffer
 80          * and enqueue a new one in it's place     80          * and enqueue a new one in it's place. */
 81         while (bcom_buffer_done(s->bcom_task))     81         while (bcom_buffer_done(s->bcom_task)) {
 82                 bcom_retrieve_buffer(s->bcom_t     82                 bcom_retrieve_buffer(s->bcom_task, NULL, NULL);
 83                                                    83 
 84                 s->period_current = (s->period     84                 s->period_current = (s->period_current+1) % s->runtime->periods;
 85                 s->period_count++;                 85                 s->period_count++;
 86                                                    86 
 87                 psc_dma_bcom_enqueue_next_buff     87                 psc_dma_bcom_enqueue_next_buffer(s);
 88         }                                          88         }
 89         spin_unlock(&s->psc_dma->lock);            89         spin_unlock(&s->psc_dma->lock);
 90                                                    90 
 91         /* If the stream is active, then also      91         /* If the stream is active, then also inform the PCM middle layer
 92          * of the period finished event. */        92          * of the period finished event. */
 93         if (s->active)                             93         if (s->active)
 94                 snd_pcm_period_elapsed(s->stre     94                 snd_pcm_period_elapsed(s->stream);
 95                                                    95 
 96         return IRQ_HANDLED;                        96         return IRQ_HANDLED;
 97 }                                                  97 }
 98                                                    98 
 99 static int psc_dma_hw_free(struct snd_pcm_subs     99 static int psc_dma_hw_free(struct snd_pcm_substream *substream)
100 {                                                 100 {
101         snd_pcm_set_runtime_buffer(substream,     101         snd_pcm_set_runtime_buffer(substream, NULL);
102         return 0;                                 102         return 0;
103 }                                                 103 }
104                                                   104 
105 /**                                               105 /**
106  * psc_dma_trigger: start and stop the DMA tra    106  * psc_dma_trigger: start and stop the DMA transfer.
107  *                                                107  *
108  * This function is called by ALSA to start, s    108  * This function is called by ALSA to start, stop, pause, and resume the DMA
109  * transfer of data.                              109  * transfer of data.
110  */                                               110  */
111 static int psc_dma_trigger(struct snd_pcm_subs    111 static int psc_dma_trigger(struct snd_pcm_substream *substream, int cmd)
112 {                                                 112 {
113         struct snd_soc_pcm_runtime *rtd = subs    113         struct snd_soc_pcm_runtime *rtd = substream->private_data;
114         struct psc_dma *psc_dma = snd_soc_dai_    114         struct psc_dma *psc_dma = snd_soc_dai_get_drvdata(rtd->cpu_dai);
115         struct snd_pcm_runtime *runtime = subs    115         struct snd_pcm_runtime *runtime = substream->runtime;
116         struct psc_dma_stream *s = to_psc_dma_    116         struct psc_dma_stream *s = to_psc_dma_stream(substream, psc_dma);
117         struct mpc52xx_psc __iomem *regs = psc    117         struct mpc52xx_psc __iomem *regs = psc_dma->psc_regs;
118         u16 imr;                                  118         u16 imr;
119         unsigned long flags;                      119         unsigned long flags;
120         int i;                                    120         int i;
121                                                   121 
122         switch (cmd) {                            122         switch (cmd) {
123         case SNDRV_PCM_TRIGGER_START:             123         case SNDRV_PCM_TRIGGER_START:
124                 dev_dbg(psc_dma->dev, "START:     124                 dev_dbg(psc_dma->dev, "START: stream=%i fbits=%u ps=%u #p=%u\n",
125                         substream->pstr->strea    125                         substream->pstr->stream, runtime->frame_bits,
126                         (int)runtime->period_s    126                         (int)runtime->period_size, runtime->periods);
127                 s->period_bytes = frames_to_by    127                 s->period_bytes = frames_to_bytes(runtime,
128                                                   128                                                   runtime->period_size);
129                 s->period_next = 0;               129                 s->period_next = 0;
130                 s->period_current = 0;            130                 s->period_current = 0;
131                 s->active = 1;                    131                 s->active = 1;
132                 s->period_count = 0;              132                 s->period_count = 0;
133                 s->runtime = runtime;             133                 s->runtime = runtime;
134                                                   134 
135                 /* Fill up the bestcomm bd que    135                 /* Fill up the bestcomm bd queue and enable DMA.
136                  * This will begin filling the    136                  * This will begin filling the PSC's fifo.
137                  */                               137                  */
138                 spin_lock_irqsave(&psc_dma->lo    138                 spin_lock_irqsave(&psc_dma->lock, flags);
139                                                   139 
140                 if (substream->pstr->stream ==    140                 if (substream->pstr->stream == SNDRV_PCM_STREAM_CAPTURE)
141                         bcom_gen_bd_rx_reset(s    141                         bcom_gen_bd_rx_reset(s->bcom_task);
142                 else                              142                 else
143                         bcom_gen_bd_tx_reset(s    143                         bcom_gen_bd_tx_reset(s->bcom_task);
144                                                   144 
145                 for (i = 0; i < runtime->perio    145                 for (i = 0; i < runtime->periods; i++)
146                         if (!bcom_queue_full(s    146                         if (!bcom_queue_full(s->bcom_task))
147                                 psc_dma_bcom_e    147                                 psc_dma_bcom_enqueue_next_buffer(s);
148                                                   148 
149                 bcom_enable(s->bcom_task);        149                 bcom_enable(s->bcom_task);
150                 spin_unlock_irqrestore(&psc_dm    150                 spin_unlock_irqrestore(&psc_dma->lock, flags);
151                                                   151 
152                 out_8(&regs->command, MPC52xx_    152                 out_8(&regs->command, MPC52xx_PSC_RST_ERR_STAT);
153                                                   153 
154                 break;                            154                 break;
155                                                   155 
156         case SNDRV_PCM_TRIGGER_STOP:              156         case SNDRV_PCM_TRIGGER_STOP:
157                 dev_dbg(psc_dma->dev, "STOP: s    157                 dev_dbg(psc_dma->dev, "STOP: stream=%i periods_count=%i\n",
158                         substream->pstr->strea    158                         substream->pstr->stream, s->period_count);
159                 s->active = 0;                    159                 s->active = 0;
160                                                   160 
161                 spin_lock_irqsave(&psc_dma->lo    161                 spin_lock_irqsave(&psc_dma->lock, flags);
162                 bcom_disable(s->bcom_task);       162                 bcom_disable(s->bcom_task);
163                 if (substream->pstr->stream ==    163                 if (substream->pstr->stream == SNDRV_PCM_STREAM_CAPTURE)
164                         bcom_gen_bd_rx_reset(s    164                         bcom_gen_bd_rx_reset(s->bcom_task);
165                 else                              165                 else
166                         bcom_gen_bd_tx_reset(s    166                         bcom_gen_bd_tx_reset(s->bcom_task);
167                 spin_unlock_irqrestore(&psc_dm    167                 spin_unlock_irqrestore(&psc_dma->lock, flags);
168                                                   168 
169                 break;                            169                 break;
170                                                   170 
171         default:                                  171         default:
172                 dev_dbg(psc_dma->dev, "unhandl    172                 dev_dbg(psc_dma->dev, "unhandled trigger: stream=%i cmd=%i\n",
173                         substream->pstr->strea    173                         substream->pstr->stream, cmd);
174                 return -EINVAL;                   174                 return -EINVAL;
175         }                                         175         }
176                                                   176 
177         /* Update interrupt enable settings */    177         /* Update interrupt enable settings */
178         imr = 0;                                  178         imr = 0;
179         if (psc_dma->playback.active)             179         if (psc_dma->playback.active)
180                 imr |= MPC52xx_PSC_IMR_TXEMP;     180                 imr |= MPC52xx_PSC_IMR_TXEMP;
181         if (psc_dma->capture.active)              181         if (psc_dma->capture.active)
182                 imr |= MPC52xx_PSC_IMR_ORERR;     182                 imr |= MPC52xx_PSC_IMR_ORERR;
183         out_be16(&regs->isr_imr.imr, psc_dma->    183         out_be16(&regs->isr_imr.imr, psc_dma->imr | imr);
184                                                   184 
185         return 0;                                 185         return 0;
186 }                                                 186 }
187                                                   187 
188                                                   188 
189 /* -------------------------------------------    189 /* ---------------------------------------------------------------------
190  * The PSC DMA 'ASoC platform' driver             190  * The PSC DMA 'ASoC platform' driver
191  *                                                191  *
192  * Can be referenced by an 'ASoC machine' driv    192  * Can be referenced by an 'ASoC machine' driver
193  * This driver only deals with the audio bus;     193  * This driver only deals with the audio bus; it doesn't have any
194  * interaction with the attached codec            194  * interaction with the attached codec
195  */                                               195  */
196                                                   196 
197 static const struct snd_pcm_hardware psc_dma_h    197 static const struct snd_pcm_hardware psc_dma_hardware = {
198         .info = SNDRV_PCM_INFO_MMAP | SNDRV_PC    198         .info = SNDRV_PCM_INFO_MMAP | SNDRV_PCM_INFO_MMAP_VALID |
199                 SNDRV_PCM_INFO_INTERLEAVED | S    199                 SNDRV_PCM_INFO_INTERLEAVED | SNDRV_PCM_INFO_BLOCK_TRANSFER |
200                 SNDRV_PCM_INFO_BATCH,             200                 SNDRV_PCM_INFO_BATCH,
201         .formats = SNDRV_PCM_FMTBIT_S8 | SNDRV    201         .formats = SNDRV_PCM_FMTBIT_S8 | SNDRV_PCM_FMTBIT_S16_BE |
202                 SNDRV_PCM_FMTBIT_S24_BE | SNDR    202                 SNDRV_PCM_FMTBIT_S24_BE | SNDRV_PCM_FMTBIT_S32_BE,
203         .period_bytes_max       = 1024 * 1024,    203         .period_bytes_max       = 1024 * 1024,
204         .period_bytes_min       = 32,             204         .period_bytes_min       = 32,
205         .periods_min            = 2,              205         .periods_min            = 2,
206         .periods_max            = 256,            206         .periods_max            = 256,
207         .buffer_bytes_max       = 2 * 1024 * 1    207         .buffer_bytes_max       = 2 * 1024 * 1024,
208         .fifo_size              = 512,            208         .fifo_size              = 512,
209 };                                                209 };
210                                                   210 
211 static int psc_dma_open(struct snd_pcm_substre    211 static int psc_dma_open(struct snd_pcm_substream *substream)
212 {                                                 212 {
213         struct snd_pcm_runtime *runtime = subs    213         struct snd_pcm_runtime *runtime = substream->runtime;
214         struct snd_soc_pcm_runtime *rtd = subs    214         struct snd_soc_pcm_runtime *rtd = substream->private_data;
215         struct psc_dma *psc_dma = snd_soc_dai_    215         struct psc_dma *psc_dma = snd_soc_dai_get_drvdata(rtd->cpu_dai);
216         struct psc_dma_stream *s;                 216         struct psc_dma_stream *s;
217         int rc;                                   217         int rc;
218                                                   218 
219         dev_dbg(psc_dma->dev, "psc_dma_open(su    219         dev_dbg(psc_dma->dev, "psc_dma_open(substream=%p)\n", substream);
220                                                   220 
221         if (substream->pstr->stream == SNDRV_P    221         if (substream->pstr->stream == SNDRV_PCM_STREAM_CAPTURE)
222                 s = &psc_dma->capture;            222                 s = &psc_dma->capture;
223         else                                      223         else
224                 s = &psc_dma->playback;           224                 s = &psc_dma->playback;
225                                                   225 
226         snd_soc_set_runtime_hwparams(substream    226         snd_soc_set_runtime_hwparams(substream, &psc_dma_hardware);
227                                                   227 
228         rc = snd_pcm_hw_constraint_integer(run    228         rc = snd_pcm_hw_constraint_integer(runtime,
229                 SNDRV_PCM_HW_PARAM_PERIODS);      229                 SNDRV_PCM_HW_PARAM_PERIODS);
230         if (rc < 0) {                             230         if (rc < 0) {
231                 dev_err(substream->pcm->card->    231                 dev_err(substream->pcm->card->dev, "invalid buffer size\n");
232                 return rc;                        232                 return rc;
233         }                                         233         }
234                                                   234 
235         s->stream = substream;                    235         s->stream = substream;
236         return 0;                                 236         return 0;
237 }                                                 237 }
238                                                   238 
239 static int psc_dma_close(struct snd_pcm_substr    239 static int psc_dma_close(struct snd_pcm_substream *substream)
240 {                                                 240 {
241         struct snd_soc_pcm_runtime *rtd = subs    241         struct snd_soc_pcm_runtime *rtd = substream->private_data;
242         struct psc_dma *psc_dma = snd_soc_dai_    242         struct psc_dma *psc_dma = snd_soc_dai_get_drvdata(rtd->cpu_dai);
243         struct psc_dma_stream *s;                 243         struct psc_dma_stream *s;
244                                                   244 
245         dev_dbg(psc_dma->dev, "psc_dma_close(s    245         dev_dbg(psc_dma->dev, "psc_dma_close(substream=%p)\n", substream);
246                                                   246 
247         if (substream->pstr->stream == SNDRV_P    247         if (substream->pstr->stream == SNDRV_PCM_STREAM_CAPTURE)
248                 s = &psc_dma->capture;            248                 s = &psc_dma->capture;
249         else                                      249         else
250                 s = &psc_dma->playback;           250                 s = &psc_dma->playback;
251                                                   251 
252         if (!psc_dma->playback.active &&          252         if (!psc_dma->playback.active &&
253             !psc_dma->capture.active) {           253             !psc_dma->capture.active) {
254                                                   254 
255                 /* Disable all interrupts and     255                 /* Disable all interrupts and reset the PSC */
256                 out_be16(&psc_dma->psc_regs->i    256                 out_be16(&psc_dma->psc_regs->isr_imr.imr, psc_dma->imr);
257                 out_8(&psc_dma->psc_regs->comm    257                 out_8(&psc_dma->psc_regs->command, 4 << 4); /* reset error */
258         }                                         258         }
259         s->stream = NULL;                         259         s->stream = NULL;
260         return 0;                                 260         return 0;
261 }                                                 261 }
262                                                   262 
263 static snd_pcm_uframes_t                          263 static snd_pcm_uframes_t
264 psc_dma_pointer(struct snd_pcm_substream *subs    264 psc_dma_pointer(struct snd_pcm_substream *substream)
265 {                                                 265 {
266         struct snd_soc_pcm_runtime *rtd = subs    266         struct snd_soc_pcm_runtime *rtd = substream->private_data;
267         struct psc_dma *psc_dma = snd_soc_dai_    267         struct psc_dma *psc_dma = snd_soc_dai_get_drvdata(rtd->cpu_dai);
268         struct psc_dma_stream *s;                 268         struct psc_dma_stream *s;
269         dma_addr_t count;                         269         dma_addr_t count;
270                                                   270 
271         if (substream->pstr->stream == SNDRV_P    271         if (substream->pstr->stream == SNDRV_PCM_STREAM_CAPTURE)
272                 s = &psc_dma->capture;            272                 s = &psc_dma->capture;
273         else                                      273         else
274                 s = &psc_dma->playback;           274                 s = &psc_dma->playback;
275                                                   275 
276         count = s->period_current * s->period_    276         count = s->period_current * s->period_bytes;
277                                                   277 
278         return bytes_to_frames(substream->runt    278         return bytes_to_frames(substream->runtime, count);
279 }                                                 279 }
280                                                   280 
281 static int                                        281 static int
282 psc_dma_hw_params(struct snd_pcm_substream *su    282 psc_dma_hw_params(struct snd_pcm_substream *substream,
283                          struct snd_pcm_hw_par    283                          struct snd_pcm_hw_params *params)
284 {                                                 284 {
285         snd_pcm_set_runtime_buffer(substream,     285         snd_pcm_set_runtime_buffer(substream, &substream->dma_buffer);
286                                                   286 
287         return 0;                                 287         return 0;
288 }                                                 288 }
289                                                   289 
290 static struct snd_pcm_ops psc_dma_ops = {         290 static struct snd_pcm_ops psc_dma_ops = {
291         .open           = psc_dma_open,           291         .open           = psc_dma_open,
292         .close          = psc_dma_close,          292         .close          = psc_dma_close,
293         .hw_free        = psc_dma_hw_free,        293         .hw_free        = psc_dma_hw_free,
294         .ioctl          = snd_pcm_lib_ioctl,      294         .ioctl          = snd_pcm_lib_ioctl,
295         .pointer        = psc_dma_pointer,        295         .pointer        = psc_dma_pointer,
296         .trigger        = psc_dma_trigger,        296         .trigger        = psc_dma_trigger,
297         .hw_params      = psc_dma_hw_params,      297         .hw_params      = psc_dma_hw_params,
298 };                                                298 };
299                                                   299 
300 static int psc_dma_new(struct snd_soc_pcm_runt    300 static int psc_dma_new(struct snd_soc_pcm_runtime *rtd)
301 {                                                 301 {
302         struct snd_card *card = rtd->card->snd    302         struct snd_card *card = rtd->card->snd_card;
303         struct snd_soc_dai *dai = rtd->cpu_dai    303         struct snd_soc_dai *dai = rtd->cpu_dai;
304         struct snd_pcm *pcm = rtd->pcm;           304         struct snd_pcm *pcm = rtd->pcm;
305         struct psc_dma *psc_dma = snd_soc_dai_    305         struct psc_dma *psc_dma = snd_soc_dai_get_drvdata(rtd->cpu_dai);
306         size_t size = psc_dma_hardware.buffer_    306         size_t size = psc_dma_hardware.buffer_bytes_max;
307         int rc;                                   307         int rc;
308                                                   308 
309         dev_dbg(rtd->platform->dev, "psc_dma_n    309         dev_dbg(rtd->platform->dev, "psc_dma_new(card=%p, dai=%p, pcm=%p)\n",
310                 card, dai, pcm);                  310                 card, dai, pcm);
311                                                   311 
312         rc = dma_coerce_mask_and_coherent(card    312         rc = dma_coerce_mask_and_coherent(card->dev, DMA_BIT_MASK(32));
313         if (rc)                                   313         if (rc)
314                 return rc;                        314                 return rc;
315                                                   315 
316         if (pcm->streams[SNDRV_PCM_STREAM_PLAY    316         if (pcm->streams[SNDRV_PCM_STREAM_PLAYBACK].substream) {
317                 rc = snd_dma_alloc_pages(SNDRV    317                 rc = snd_dma_alloc_pages(SNDRV_DMA_TYPE_DEV, pcm->card->dev,
318                                 size, &pcm->st    318                                 size, &pcm->streams[SNDRV_PCM_STREAM_PLAYBACK].substream->dma_buffer);
319                 if (rc)                           319                 if (rc)
320                         goto playback_alloc_er    320                         goto playback_alloc_err;
321         }                                         321         }
322                                                   322 
323         if (pcm->streams[SNDRV_PCM_STREAM_CAPT    323         if (pcm->streams[SNDRV_PCM_STREAM_CAPTURE].substream) {
324                 rc = snd_dma_alloc_pages(SNDRV    324                 rc = snd_dma_alloc_pages(SNDRV_DMA_TYPE_DEV, pcm->card->dev,
325                                 size, &pcm->st    325                                 size, &pcm->streams[SNDRV_PCM_STREAM_CAPTURE].substream->dma_buffer);
326                 if (rc)                           326                 if (rc)
327                         goto capture_alloc_err    327                         goto capture_alloc_err;
328         }                                         328         }
329                                                   329 
330         return 0;                                 330         return 0;
331                                                   331 
332  capture_alloc_err:                               332  capture_alloc_err:
333         if (pcm->streams[SNDRV_PCM_STREAM_PLAY    333         if (pcm->streams[SNDRV_PCM_STREAM_PLAYBACK].substream)
334                 snd_dma_free_pages(&pcm->strea    334                 snd_dma_free_pages(&pcm->streams[SNDRV_PCM_STREAM_PLAYBACK].substream->dma_buffer);
335                                                   335 
336  playback_alloc_err:                              336  playback_alloc_err:
337         dev_err(card->dev, "Cannot allocate bu    337         dev_err(card->dev, "Cannot allocate buffer(s)\n");
338                                                   338 
339         return -ENOMEM;                           339         return -ENOMEM;
340 }                                                 340 }
341                                                   341 
342 static void psc_dma_free(struct snd_pcm *pcm)     342 static void psc_dma_free(struct snd_pcm *pcm)
343 {                                                 343 {
344         struct snd_soc_pcm_runtime *rtd = pcm-    344         struct snd_soc_pcm_runtime *rtd = pcm->private_data;
345         struct snd_pcm_substream *substream;      345         struct snd_pcm_substream *substream;
346         int stream;                               346         int stream;
347                                                   347 
348         dev_dbg(rtd->platform->dev, "psc_dma_f    348         dev_dbg(rtd->platform->dev, "psc_dma_free(pcm=%p)\n", pcm);
349                                                   349 
350         for (stream = 0; stream < 2; stream++)    350         for (stream = 0; stream < 2; stream++) {
351                 substream = pcm->streams[strea    351                 substream = pcm->streams[stream].substream;
352                 if (substream) {                  352                 if (substream) {
353                         snd_dma_free_pages(&su    353                         snd_dma_free_pages(&substream->dma_buffer);
354                         substream->dma_buffer.    354                         substream->dma_buffer.area = NULL;
355                         substream->dma_buffer.    355                         substream->dma_buffer.addr = 0;
356                 }                                 356                 }
357         }                                         357         }
358 }                                                 358 }
359                                                   359 
360 static struct snd_soc_platform_driver mpc5200_    360 static struct snd_soc_platform_driver mpc5200_audio_dma_platform = {
361         .ops            = &psc_dma_ops,           361         .ops            = &psc_dma_ops,
362         .pcm_new        = &psc_dma_new,           362         .pcm_new        = &psc_dma_new,
363         .pcm_free       = &psc_dma_free,          363         .pcm_free       = &psc_dma_free,
364 };                                                364 };
365                                                   365 
366 int mpc5200_audio_dma_create(struct platform_d    366 int mpc5200_audio_dma_create(struct platform_device *op)
367 {                                                 367 {
368         phys_addr_t fifo;                         368         phys_addr_t fifo;
369         struct psc_dma *psc_dma;                  369         struct psc_dma *psc_dma;
370         struct resource res;                      370         struct resource res;
371         int size, irq, rc;                        371         int size, irq, rc;
372         const __be32 *prop;                       372         const __be32 *prop;
373         void __iomem *regs;                       373         void __iomem *regs;
374         int ret;                                  374         int ret;
375                                                   375 
376         /* Fetch the registers and IRQ of the     376         /* Fetch the registers and IRQ of the PSC */
377         irq = irq_of_parse_and_map(op->dev.of_    377         irq = irq_of_parse_and_map(op->dev.of_node, 0);
378         if (of_address_to_resource(op->dev.of_    378         if (of_address_to_resource(op->dev.of_node, 0, &res)) {
379                 dev_err(&op->dev, "Missing reg    379                 dev_err(&op->dev, "Missing reg property\n");
380                 return -ENODEV;                   380                 return -ENODEV;
381         }                                         381         }
382         regs = ioremap(res.start, resource_siz    382         regs = ioremap(res.start, resource_size(&res));
383         if (!regs) {                              383         if (!regs) {
384                 dev_err(&op->dev, "Could not m    384                 dev_err(&op->dev, "Could not map registers\n");
385                 return -ENODEV;                   385                 return -ENODEV;
386         }                                         386         }
387                                                   387 
388         /* Allocate and initialize the driver     388         /* Allocate and initialize the driver private data */
389         psc_dma = kzalloc(sizeof *psc_dma, GFP    389         psc_dma = kzalloc(sizeof *psc_dma, GFP_KERNEL);
390         if (!psc_dma) {                           390         if (!psc_dma) {
391                 ret = -ENOMEM;                    391                 ret = -ENOMEM;
392                 goto out_unmap;                   392                 goto out_unmap;
393         }                                         393         }
394                                                   394 
395         /* Get the PSC ID */                      395         /* Get the PSC ID */
396         prop = of_get_property(op->dev.of_node    396         prop = of_get_property(op->dev.of_node, "cell-index", &size);
397         if (!prop || size < sizeof *prop) {       397         if (!prop || size < sizeof *prop) {
398                 ret = -ENODEV;                    398                 ret = -ENODEV;
399                 goto out_free;                    399                 goto out_free;
400         }                                         400         }
401                                                   401 
402         spin_lock_init(&psc_dma->lock);           402         spin_lock_init(&psc_dma->lock);
403         mutex_init(&psc_dma->mutex);              403         mutex_init(&psc_dma->mutex);
404         psc_dma->id = be32_to_cpu(*prop);         404         psc_dma->id = be32_to_cpu(*prop);
405         psc_dma->irq = irq;                       405         psc_dma->irq = irq;
406         psc_dma->psc_regs = regs;                 406         psc_dma->psc_regs = regs;
407         psc_dma->fifo_regs = regs + sizeof *ps    407         psc_dma->fifo_regs = regs + sizeof *psc_dma->psc_regs;
408         psc_dma->dev = &op->dev;                  408         psc_dma->dev = &op->dev;
409         psc_dma->playback.psc_dma = psc_dma;      409         psc_dma->playback.psc_dma = psc_dma;
410         psc_dma->capture.psc_dma = psc_dma;       410         psc_dma->capture.psc_dma = psc_dma;
411         snprintf(psc_dma->name, sizeof psc_dma    411         snprintf(psc_dma->name, sizeof psc_dma->name, "PSC%u", psc_dma->id);
412                                                   412 
413         /* Find the address of the fifo data r    413         /* Find the address of the fifo data registers and setup the
414          * DMA tasks */                           414          * DMA tasks */
415         fifo = res.start + offsetof(struct mpc    415         fifo = res.start + offsetof(struct mpc52xx_psc, buffer.buffer_32);
416         psc_dma->capture.bcom_task =              416         psc_dma->capture.bcom_task =
417                 bcom_psc_gen_bd_rx_init(psc_dm    417                 bcom_psc_gen_bd_rx_init(psc_dma->id, 10, fifo, 512);
418         psc_dma->playback.bcom_task =             418         psc_dma->playback.bcom_task =
419                 bcom_psc_gen_bd_tx_init(psc_dm    419                 bcom_psc_gen_bd_tx_init(psc_dma->id, 10, fifo);
420         if (!psc_dma->capture.bcom_task ||        420         if (!psc_dma->capture.bcom_task ||
421             !psc_dma->playback.bcom_task) {       421             !psc_dma->playback.bcom_task) {
422                 dev_err(&op->dev, "Could not a    422                 dev_err(&op->dev, "Could not allocate bestcomm tasks\n");
423                 ret = -ENODEV;                    423                 ret = -ENODEV;
424                 goto out_free;                    424                 goto out_free;
425         }                                         425         }
426                                                   426 
427         /* Disable all interrupts and reset th    427         /* Disable all interrupts and reset the PSC */
428         out_be16(&psc_dma->psc_regs->isr_imr.i    428         out_be16(&psc_dma->psc_regs->isr_imr.imr, psc_dma->imr);
429          /* reset receiver */                     429          /* reset receiver */
430         out_8(&psc_dma->psc_regs->command, MPC    430         out_8(&psc_dma->psc_regs->command, MPC52xx_PSC_RST_RX);
431          /* reset transmitter */                  431          /* reset transmitter */
432         out_8(&psc_dma->psc_regs->command, MPC    432         out_8(&psc_dma->psc_regs->command, MPC52xx_PSC_RST_TX);
433          /* reset error */                        433          /* reset error */
434         out_8(&psc_dma->psc_regs->command, MPC    434         out_8(&psc_dma->psc_regs->command, MPC52xx_PSC_RST_ERR_STAT);
435          /* reset mode */                         435          /* reset mode */
436         out_8(&psc_dma->psc_regs->command, MPC    436         out_8(&psc_dma->psc_regs->command, MPC52xx_PSC_SEL_MODE_REG_1);
437                                                   437 
438         /* Set up mode register;                  438         /* Set up mode register;
439          * First write: RxRdy (FIFO Alarm) gen    439          * First write: RxRdy (FIFO Alarm) generates rx FIFO irq
440          * Second write: register Normal mode     440          * Second write: register Normal mode for non loopback
441          */                                       441          */
442         out_8(&psc_dma->psc_regs->mode, 0);       442         out_8(&psc_dma->psc_regs->mode, 0);
443         out_8(&psc_dma->psc_regs->mode, 0);       443         out_8(&psc_dma->psc_regs->mode, 0);
444                                                   444 
445         /* Set the TX and RX fifo alarm thresh    445         /* Set the TX and RX fifo alarm thresholds */
446         out_be16(&psc_dma->fifo_regs->rfalarm,    446         out_be16(&psc_dma->fifo_regs->rfalarm, 0x100);
447         out_8(&psc_dma->fifo_regs->rfcntl, 0x4    447         out_8(&psc_dma->fifo_regs->rfcntl, 0x4);
448         out_be16(&psc_dma->fifo_regs->tfalarm,    448         out_be16(&psc_dma->fifo_regs->tfalarm, 0x100);
449         out_8(&psc_dma->fifo_regs->tfcntl, 0x7    449         out_8(&psc_dma->fifo_regs->tfcntl, 0x7);
450                                                   450 
451         /* Lookup the IRQ numbers */              451         /* Lookup the IRQ numbers */
452         psc_dma->playback.irq =                   452         psc_dma->playback.irq =
453                 bcom_get_task_irq(psc_dma->pla    453                 bcom_get_task_irq(psc_dma->playback.bcom_task);
454         psc_dma->capture.irq =                    454         psc_dma->capture.irq =
455                 bcom_get_task_irq(psc_dma->cap    455                 bcom_get_task_irq(psc_dma->capture.bcom_task);
456                                                   456 
457         rc = request_irq(psc_dma->irq, &psc_dm    457         rc = request_irq(psc_dma->irq, &psc_dma_status_irq, IRQF_SHARED,
458                          "psc-dma-status", psc    458                          "psc-dma-status", psc_dma);
459         rc |= request_irq(psc_dma->capture.irq    459         rc |= request_irq(psc_dma->capture.irq, &psc_dma_bcom_irq, IRQF_SHARED,
460                           "psc-dma-capture", &    460                           "psc-dma-capture", &psc_dma->capture);
461         rc |= request_irq(psc_dma->playback.ir    461         rc |= request_irq(psc_dma->playback.irq, &psc_dma_bcom_irq, IRQF_SHARED,
462                           "psc-dma-playback",     462                           "psc-dma-playback", &psc_dma->playback);
463         if (rc) {                                 463         if (rc) {
464                 ret = -ENODEV;                    464                 ret = -ENODEV;
465                 goto out_irq;                     465                 goto out_irq;
466         }                                         466         }
467                                                   467 
468         /* Save what we've done so it can be f    468         /* Save what we've done so it can be found again later */
469         dev_set_drvdata(&op->dev, psc_dma);       469         dev_set_drvdata(&op->dev, psc_dma);
470                                                   470 
471         /* Tell the ASoC OF helpers about it *    471         /* Tell the ASoC OF helpers about it */
472         return snd_soc_register_platform(&op->    472         return snd_soc_register_platform(&op->dev, &mpc5200_audio_dma_platform);
473 out_irq:                                          473 out_irq:
474         free_irq(psc_dma->irq, psc_dma);          474         free_irq(psc_dma->irq, psc_dma);
475         free_irq(psc_dma->capture.irq, &psc_dm    475         free_irq(psc_dma->capture.irq, &psc_dma->capture);
476         free_irq(psc_dma->playback.irq, &psc_d    476         free_irq(psc_dma->playback.irq, &psc_dma->playback);
477 out_free:                                         477 out_free:
478         kfree(psc_dma);                           478         kfree(psc_dma);
479 out_unmap:                                        479 out_unmap:
480         iounmap(regs);                            480         iounmap(regs);
481         return ret;                               481         return ret;
482 }                                                 482 }
483 EXPORT_SYMBOL_GPL(mpc5200_audio_dma_create);      483 EXPORT_SYMBOL_GPL(mpc5200_audio_dma_create);
484                                                   484 
485 int mpc5200_audio_dma_destroy(struct platform_    485 int mpc5200_audio_dma_destroy(struct platform_device *op)
486 {                                                 486 {
487         struct psc_dma *psc_dma = dev_get_drvd    487         struct psc_dma *psc_dma = dev_get_drvdata(&op->dev);
488                                                   488 
489         dev_dbg(&op->dev, "mpc5200_audio_dma_d    489         dev_dbg(&op->dev, "mpc5200_audio_dma_destroy()\n");
490                                                   490 
491         snd_soc_unregister_platform(&op->dev);    491         snd_soc_unregister_platform(&op->dev);
492                                                   492 
493         bcom_gen_bd_rx_release(psc_dma->captur    493         bcom_gen_bd_rx_release(psc_dma->capture.bcom_task);
494         bcom_gen_bd_tx_release(psc_dma->playba    494         bcom_gen_bd_tx_release(psc_dma->playback.bcom_task);
495                                                   495 
496         /* Release irqs */                        496         /* Release irqs */
497         free_irq(psc_dma->irq, psc_dma);          497         free_irq(psc_dma->irq, psc_dma);
498         free_irq(psc_dma->capture.irq, &psc_dm    498         free_irq(psc_dma->capture.irq, &psc_dma->capture);
499         free_irq(psc_dma->playback.irq, &psc_d    499         free_irq(psc_dma->playback.irq, &psc_dma->playback);
500                                                   500 
501         iounmap(psc_dma->psc_regs);               501         iounmap(psc_dma->psc_regs);
502         kfree(psc_dma);                           502         kfree(psc_dma);
503         dev_set_drvdata(&op->dev, NULL);          503         dev_set_drvdata(&op->dev, NULL);
504                                                   504 
505         return 0;                                 505         return 0;
506 }                                                 506 }
507 EXPORT_SYMBOL_GPL(mpc5200_audio_dma_destroy);     507 EXPORT_SYMBOL_GPL(mpc5200_audio_dma_destroy);
508                                                   508 
509 MODULE_AUTHOR("Grant Likely <grant.likely@secr    509 MODULE_AUTHOR("Grant Likely <grant.likely@secretlab.ca>");
510 MODULE_DESCRIPTION("Freescale MPC5200 PSC in D    510 MODULE_DESCRIPTION("Freescale MPC5200 PSC in DMA mode ASoC Driver");
511 MODULE_LICENSE("GPL");                            511 MODULE_LICENSE("GPL");
512                                                   512 

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