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1// SPDX-License-Identifier: GPL-2.0-only
2/*
3 * Au12x0/Au1550 PSC ALSA ASoC audio support.
4 *
5 * (c) 2007-2008 MSC Vertriebsges.m.b.H.,
6 * Manuel Lauss <manuel.lauss@gmail.com>
7 *
8 * DMA glue for Au1x-PSC audio.
9 */
10
11
12#include <linux/module.h>
13#include <linux/init.h>
14#include <linux/platform_device.h>
15#include <linux/slab.h>
16#include <linux/dma-mapping.h>
17
18#include <sound/core.h>
19#include <sound/pcm.h>
20#include <sound/pcm_params.h>
21#include <sound/soc.h>
22
23#include <asm/mach-au1x00/au1000.h>
24#include <asm/mach-au1x00/au1xxx_dbdma.h>
25#include <asm/mach-au1x00/au1xxx_psc.h>
26
27#include "psc.h"
28
29/*#define PCM_DEBUG*/
30
31#define DRV_NAME "dbdma2"
32
33#define MSG(x...) printk(KERN_INFO "au1xpsc_pcm: " x)
34#ifdef PCM_DEBUG
35#define DBG MSG
36#else
37#define DBG(x...) do {} while (0)
38#endif
39
40struct au1xpsc_audio_dmadata {
41 /* DDMA control data */
42 unsigned int ddma_id; /* DDMA direction ID for this PSC */
43 u32 ddma_chan; /* DDMA context */
44
45 /* PCM context (for irq handlers) */
46 struct snd_pcm_substream *substream;
47 unsigned long curr_period; /* current segment DDMA is working on */
48 unsigned long q_period; /* queue period(s) */
49 dma_addr_t dma_area; /* address of queued DMA area */
50 dma_addr_t dma_area_s; /* start address of DMA area */
51 unsigned long pos; /* current byte position being played */
52 unsigned long periods; /* number of SG segments in total */
53 unsigned long period_bytes; /* size in bytes of one SG segment */
54
55 /* runtime data */
56 int msbits;
57};
58
59/*
60 * These settings are somewhat okay, at least on my machine audio plays
61 * almost skip-free. Especially the 64kB buffer seems to help a LOT.
62 */
63#define AU1XPSC_PERIOD_MIN_BYTES 1024
64#define AU1XPSC_BUFFER_MIN_BYTES 65536
65
66/* PCM hardware DMA capabilities - platform specific */
67static const struct snd_pcm_hardware au1xpsc_pcm_hardware = {
68 .info = SNDRV_PCM_INFO_MMAP | SNDRV_PCM_INFO_MMAP_VALID |
69 SNDRV_PCM_INFO_INTERLEAVED | SNDRV_PCM_INFO_BATCH,
70 .period_bytes_min = AU1XPSC_PERIOD_MIN_BYTES,
71 .period_bytes_max = 4096 * 1024 - 1,
72 .periods_min = 2,
73 .periods_max = 4096, /* 2 to as-much-as-you-like */
74 .buffer_bytes_max = 4096 * 1024 - 1,
75 .fifo_size = 16, /* fifo entries of AC97/I2S PSC */
76};
77
78static void au1x_pcm_queue_tx(struct au1xpsc_audio_dmadata *cd)
79{
80 au1xxx_dbdma_put_source(cd->ddma_chan, cd->dma_area,
81 cd->period_bytes, DDMA_FLAGS_IE);
82
83 /* update next-to-queue period */
84 ++cd->q_period;
85 cd->dma_area += cd->period_bytes;
86 if (cd->q_period >= cd->periods) {
87 cd->q_period = 0;
88 cd->dma_area = cd->dma_area_s;
89 }
90}
91
92static void au1x_pcm_queue_rx(struct au1xpsc_audio_dmadata *cd)
93{
94 au1xxx_dbdma_put_dest(cd->ddma_chan, cd->dma_area,
95 cd->period_bytes, DDMA_FLAGS_IE);
96
97 /* update next-to-queue period */
98 ++cd->q_period;
99 cd->dma_area += cd->period_bytes;
100 if (cd->q_period >= cd->periods) {
101 cd->q_period = 0;
102 cd->dma_area = cd->dma_area_s;
103 }
104}
105
106static void au1x_pcm_dmatx_cb(int irq, void *dev_id)
107{
108 struct au1xpsc_audio_dmadata *cd = dev_id;
109
110 cd->pos += cd->period_bytes;
111 if (++cd->curr_period >= cd->periods) {
112 cd->pos = 0;
113 cd->curr_period = 0;
114 }
115 snd_pcm_period_elapsed(cd->substream);
116 au1x_pcm_queue_tx(cd);
117}
118
119static void au1x_pcm_dmarx_cb(int irq, void *dev_id)
120{
121 struct au1xpsc_audio_dmadata *cd = dev_id;
122
123 cd->pos += cd->period_bytes;
124 if (++cd->curr_period >= cd->periods) {
125 cd->pos = 0;
126 cd->curr_period = 0;
127 }
128 snd_pcm_period_elapsed(cd->substream);
129 au1x_pcm_queue_rx(cd);
130}
131
132static void au1x_pcm_dbdma_free(struct au1xpsc_audio_dmadata *pcd)
133{
134 if (pcd->ddma_chan) {
135 au1xxx_dbdma_stop(pcd->ddma_chan);
136 au1xxx_dbdma_reset(pcd->ddma_chan);
137 au1xxx_dbdma_chan_free(pcd->ddma_chan);
138 pcd->ddma_chan = 0;
139 pcd->msbits = 0;
140 }
141}
142
143/* in case of missing DMA ring or changed TX-source / RX-dest bit widths,
144 * allocate (or reallocate) a 2-descriptor DMA ring with bit depth according
145 * to ALSA-supplied sample depth. This is due to limitations in the dbdma api
146 * (cannot adjust source/dest widths of already allocated descriptor ring).
147 */
148static int au1x_pcm_dbdma_realloc(struct au1xpsc_audio_dmadata *pcd,
149 int stype, int msbits)
150{
151 /* DMA only in 8/16/32 bit widths */
152 if (msbits == 24)
153 msbits = 32;
154
155 /* check current config: correct bits and descriptors allocated? */
156 if ((pcd->ddma_chan) && (msbits == pcd->msbits))
157 goto out; /* all ok! */
158
159 au1x_pcm_dbdma_free(pcd);
160
161 if (stype == SNDRV_PCM_STREAM_CAPTURE)
162 pcd->ddma_chan = au1xxx_dbdma_chan_alloc(pcd->ddma_id,
163 DSCR_CMD0_ALWAYS,
164 au1x_pcm_dmarx_cb, (void *)pcd);
165 else
166 pcd->ddma_chan = au1xxx_dbdma_chan_alloc(DSCR_CMD0_ALWAYS,
167 pcd->ddma_id,
168 au1x_pcm_dmatx_cb, (void *)pcd);
169
170 if (!pcd->ddma_chan)
171 return -ENOMEM;
172
173 au1xxx_dbdma_set_devwidth(pcd->ddma_chan, msbits);
174 au1xxx_dbdma_ring_alloc(pcd->ddma_chan, 2);
175
176 pcd->msbits = msbits;
177
178 au1xxx_dbdma_stop(pcd->ddma_chan);
179 au1xxx_dbdma_reset(pcd->ddma_chan);
180
181out:
182 return 0;
183}
184
185static inline struct au1xpsc_audio_dmadata *to_dmadata(struct snd_pcm_substream *ss,
186 struct snd_soc_component *component)
187{
188 struct au1xpsc_audio_dmadata *pcd = snd_soc_component_get_drvdata(component);
189 return &pcd[ss->stream];
190}
191
192static int au1xpsc_pcm_hw_params(struct snd_soc_component *component,
193 struct snd_pcm_substream *substream,
194 struct snd_pcm_hw_params *params)
195{
196 struct snd_pcm_runtime *runtime = substream->runtime;
197 struct au1xpsc_audio_dmadata *pcd;
198 int stype, ret;
199
200 stype = substream->stream;
201 pcd = to_dmadata(substream, component);
202
203 DBG("runtime->dma_area = 0x%08lx dma_addr_t = 0x%08lx dma_size = %zu "
204 "runtime->min_align %lu\n",
205 (unsigned long)runtime->dma_area,
206 (unsigned long)runtime->dma_addr, runtime->dma_bytes,
207 runtime->min_align);
208
209 DBG("bits %d frags %d frag_bytes %d is_rx %d\n", params->msbits,
210 params_periods(params), params_period_bytes(params), stype);
211
212 ret = au1x_pcm_dbdma_realloc(pcd, stype, params->msbits);
213 if (ret) {
214 MSG("DDMA channel (re)alloc failed!\n");
215 goto out;
216 }
217
218 pcd->substream = substream;
219 pcd->period_bytes = params_period_bytes(params);
220 pcd->periods = params_periods(params);
221 pcd->dma_area_s = pcd->dma_area = runtime->dma_addr;
222 pcd->q_period = 0;
223 pcd->curr_period = 0;
224 pcd->pos = 0;
225
226 ret = 0;
227out:
228 return ret;
229}
230
231static int au1xpsc_pcm_prepare(struct snd_soc_component *component,
232 struct snd_pcm_substream *substream)
233{
234 struct au1xpsc_audio_dmadata *pcd = to_dmadata(substream, component);
235
236 au1xxx_dbdma_reset(pcd->ddma_chan);
237
238 if (substream->stream == SNDRV_PCM_STREAM_CAPTURE) {
239 au1x_pcm_queue_rx(pcd);
240 au1x_pcm_queue_rx(pcd);
241 } else {
242 au1x_pcm_queue_tx(pcd);
243 au1x_pcm_queue_tx(pcd);
244 }
245
246 return 0;
247}
248
249static int au1xpsc_pcm_trigger(struct snd_soc_component *component,
250 struct snd_pcm_substream *substream, int cmd)
251{
252 u32 c = to_dmadata(substream, component)->ddma_chan;
253
254 switch (cmd) {
255 case SNDRV_PCM_TRIGGER_START:
256 case SNDRV_PCM_TRIGGER_RESUME:
257 au1xxx_dbdma_start(c);
258 break;
259 case SNDRV_PCM_TRIGGER_STOP:
260 case SNDRV_PCM_TRIGGER_SUSPEND:
261 au1xxx_dbdma_stop(c);
262 break;
263 default:
264 return -EINVAL;
265 }
266 return 0;
267}
268
269static snd_pcm_uframes_t
270au1xpsc_pcm_pointer(struct snd_soc_component *component,
271 struct snd_pcm_substream *substream)
272{
273 return bytes_to_frames(substream->runtime,
274 to_dmadata(substream, component)->pos);
275}
276
277static int au1xpsc_pcm_open(struct snd_soc_component *component,
278 struct snd_pcm_substream *substream)
279{
280 struct au1xpsc_audio_dmadata *pcd = to_dmadata(substream, component);
281 struct snd_soc_pcm_runtime *rtd = asoc_substream_to_rtd(substream);
282 int stype = substream->stream, *dmaids;
283
284 dmaids = snd_soc_dai_get_dma_data(asoc_rtd_to_cpu(rtd, 0), substream);
285 if (!dmaids)
286 return -ENODEV; /* whoa, has ordering changed? */
287
288 pcd->ddma_id = dmaids[stype];
289
290 snd_soc_set_runtime_hwparams(substream, &au1xpsc_pcm_hardware);
291 return 0;
292}
293
294static int au1xpsc_pcm_close(struct snd_soc_component *component,
295 struct snd_pcm_substream *substream)
296{
297 au1x_pcm_dbdma_free(to_dmadata(substream, component));
298 return 0;
299}
300
301static int au1xpsc_pcm_new(struct snd_soc_component *component,
302 struct snd_soc_pcm_runtime *rtd)
303{
304 struct snd_card *card = rtd->card->snd_card;
305 struct snd_pcm *pcm = rtd->pcm;
306
307 snd_pcm_set_managed_buffer_all(pcm, SNDRV_DMA_TYPE_DEV,
308 card->dev, AU1XPSC_BUFFER_MIN_BYTES, (4096 * 1024) - 1);
309
310 return 0;
311}
312
313/* au1xpsc audio platform */
314static struct snd_soc_component_driver au1xpsc_soc_component = {
315 .name = DRV_NAME,
316 .open = au1xpsc_pcm_open,
317 .close = au1xpsc_pcm_close,
318 .hw_params = au1xpsc_pcm_hw_params,
319 .prepare = au1xpsc_pcm_prepare,
320 .trigger = au1xpsc_pcm_trigger,
321 .pointer = au1xpsc_pcm_pointer,
322 .pcm_construct = au1xpsc_pcm_new,
323};
324
325static int au1xpsc_pcm_drvprobe(struct platform_device *pdev)
326{
327 struct au1xpsc_audio_dmadata *dmadata;
328
329 dmadata = devm_kcalloc(&pdev->dev,
330 2, sizeof(struct au1xpsc_audio_dmadata),
331 GFP_KERNEL);
332 if (!dmadata)
333 return -ENOMEM;
334
335 platform_set_drvdata(pdev, dmadata);
336
337 return devm_snd_soc_register_component(&pdev->dev,
338 &au1xpsc_soc_component, NULL, 0);
339}
340
341static struct platform_driver au1xpsc_pcm_driver = {
342 .driver = {
343 .name = "au1xpsc-pcm",
344 },
345 .probe = au1xpsc_pcm_drvprobe,
346};
347
348module_platform_driver(au1xpsc_pcm_driver);
349
350MODULE_LICENSE("GPL");
351MODULE_DESCRIPTION("Au12x0/Au1550 PSC Audio DMA driver");
352MODULE_AUTHOR("Manuel Lauss");
1/*
2 * Au12x0/Au1550 PSC ALSA ASoC audio support.
3 *
4 * (c) 2007-2008 MSC Vertriebsges.m.b.H.,
5 * Manuel Lauss <manuel.lauss@gmail.com>
6 *
7 * This program is free software; you can redistribute it and/or modify
8 * it under the terms of the GNU General Public License version 2 as
9 * published by the Free Software Foundation.
10 *
11 * DMA glue for Au1x-PSC audio.
12 *
13 */
14
15
16#include <linux/module.h>
17#include <linux/init.h>
18#include <linux/platform_device.h>
19#include <linux/slab.h>
20#include <linux/dma-mapping.h>
21
22#include <sound/core.h>
23#include <sound/pcm.h>
24#include <sound/pcm_params.h>
25#include <sound/soc.h>
26
27#include <asm/mach-au1x00/au1000.h>
28#include <asm/mach-au1x00/au1xxx_dbdma.h>
29#include <asm/mach-au1x00/au1xxx_psc.h>
30
31#include "psc.h"
32
33/*#define PCM_DEBUG*/
34
35#define MSG(x...) printk(KERN_INFO "au1xpsc_pcm: " x)
36#ifdef PCM_DEBUG
37#define DBG MSG
38#else
39#define DBG(x...) do {} while (0)
40#endif
41
42struct au1xpsc_audio_dmadata {
43 /* DDMA control data */
44 unsigned int ddma_id; /* DDMA direction ID for this PSC */
45 u32 ddma_chan; /* DDMA context */
46
47 /* PCM context (for irq handlers) */
48 struct snd_pcm_substream *substream;
49 unsigned long curr_period; /* current segment DDMA is working on */
50 unsigned long q_period; /* queue period(s) */
51 dma_addr_t dma_area; /* address of queued DMA area */
52 dma_addr_t dma_area_s; /* start address of DMA area */
53 unsigned long pos; /* current byte position being played */
54 unsigned long periods; /* number of SG segments in total */
55 unsigned long period_bytes; /* size in bytes of one SG segment */
56
57 /* runtime data */
58 int msbits;
59};
60
61/*
62 * These settings are somewhat okay, at least on my machine audio plays
63 * almost skip-free. Especially the 64kB buffer seems to help a LOT.
64 */
65#define AU1XPSC_PERIOD_MIN_BYTES 1024
66#define AU1XPSC_BUFFER_MIN_BYTES 65536
67
68#define AU1XPSC_PCM_FMTS \
69 (SNDRV_PCM_FMTBIT_S8 | SNDRV_PCM_FMTBIT_U8 | \
70 SNDRV_PCM_FMTBIT_S16_LE | SNDRV_PCM_FMTBIT_S16_BE | \
71 SNDRV_PCM_FMTBIT_U16_LE | SNDRV_PCM_FMTBIT_U16_BE | \
72 SNDRV_PCM_FMTBIT_S32_LE | SNDRV_PCM_FMTBIT_S32_BE | \
73 SNDRV_PCM_FMTBIT_U32_LE | SNDRV_PCM_FMTBIT_U32_BE | \
74 0)
75
76/* PCM hardware DMA capabilities - platform specific */
77static const struct snd_pcm_hardware au1xpsc_pcm_hardware = {
78 .info = SNDRV_PCM_INFO_MMAP | SNDRV_PCM_INFO_MMAP_VALID |
79 SNDRV_PCM_INFO_INTERLEAVED | SNDRV_PCM_INFO_BATCH,
80 .formats = AU1XPSC_PCM_FMTS,
81 .period_bytes_min = AU1XPSC_PERIOD_MIN_BYTES,
82 .period_bytes_max = 4096 * 1024 - 1,
83 .periods_min = 2,
84 .periods_max = 4096, /* 2 to as-much-as-you-like */
85 .buffer_bytes_max = 4096 * 1024 - 1,
86 .fifo_size = 16, /* fifo entries of AC97/I2S PSC */
87};
88
89static void au1x_pcm_queue_tx(struct au1xpsc_audio_dmadata *cd)
90{
91 au1xxx_dbdma_put_source(cd->ddma_chan, cd->dma_area,
92 cd->period_bytes, DDMA_FLAGS_IE);
93
94 /* update next-to-queue period */
95 ++cd->q_period;
96 cd->dma_area += cd->period_bytes;
97 if (cd->q_period >= cd->periods) {
98 cd->q_period = 0;
99 cd->dma_area = cd->dma_area_s;
100 }
101}
102
103static void au1x_pcm_queue_rx(struct au1xpsc_audio_dmadata *cd)
104{
105 au1xxx_dbdma_put_dest(cd->ddma_chan, cd->dma_area,
106 cd->period_bytes, DDMA_FLAGS_IE);
107
108 /* update next-to-queue period */
109 ++cd->q_period;
110 cd->dma_area += cd->period_bytes;
111 if (cd->q_period >= cd->periods) {
112 cd->q_period = 0;
113 cd->dma_area = cd->dma_area_s;
114 }
115}
116
117static void au1x_pcm_dmatx_cb(int irq, void *dev_id)
118{
119 struct au1xpsc_audio_dmadata *cd = dev_id;
120
121 cd->pos += cd->period_bytes;
122 if (++cd->curr_period >= cd->periods) {
123 cd->pos = 0;
124 cd->curr_period = 0;
125 }
126 snd_pcm_period_elapsed(cd->substream);
127 au1x_pcm_queue_tx(cd);
128}
129
130static void au1x_pcm_dmarx_cb(int irq, void *dev_id)
131{
132 struct au1xpsc_audio_dmadata *cd = dev_id;
133
134 cd->pos += cd->period_bytes;
135 if (++cd->curr_period >= cd->periods) {
136 cd->pos = 0;
137 cd->curr_period = 0;
138 }
139 snd_pcm_period_elapsed(cd->substream);
140 au1x_pcm_queue_rx(cd);
141}
142
143static void au1x_pcm_dbdma_free(struct au1xpsc_audio_dmadata *pcd)
144{
145 if (pcd->ddma_chan) {
146 au1xxx_dbdma_stop(pcd->ddma_chan);
147 au1xxx_dbdma_reset(pcd->ddma_chan);
148 au1xxx_dbdma_chan_free(pcd->ddma_chan);
149 pcd->ddma_chan = 0;
150 pcd->msbits = 0;
151 }
152}
153
154/* in case of missing DMA ring or changed TX-source / RX-dest bit widths,
155 * allocate (or reallocate) a 2-descriptor DMA ring with bit depth according
156 * to ALSA-supplied sample depth. This is due to limitations in the dbdma api
157 * (cannot adjust source/dest widths of already allocated descriptor ring).
158 */
159static int au1x_pcm_dbdma_realloc(struct au1xpsc_audio_dmadata *pcd,
160 int stype, int msbits)
161{
162 /* DMA only in 8/16/32 bit widths */
163 if (msbits == 24)
164 msbits = 32;
165
166 /* check current config: correct bits and descriptors allocated? */
167 if ((pcd->ddma_chan) && (msbits == pcd->msbits))
168 goto out; /* all ok! */
169
170 au1x_pcm_dbdma_free(pcd);
171
172 if (stype == PCM_RX)
173 pcd->ddma_chan = au1xxx_dbdma_chan_alloc(pcd->ddma_id,
174 DSCR_CMD0_ALWAYS,
175 au1x_pcm_dmarx_cb, (void *)pcd);
176 else
177 pcd->ddma_chan = au1xxx_dbdma_chan_alloc(DSCR_CMD0_ALWAYS,
178 pcd->ddma_id,
179 au1x_pcm_dmatx_cb, (void *)pcd);
180
181 if (!pcd->ddma_chan)
182 return -ENOMEM;
183
184 au1xxx_dbdma_set_devwidth(pcd->ddma_chan, msbits);
185 au1xxx_dbdma_ring_alloc(pcd->ddma_chan, 2);
186
187 pcd->msbits = msbits;
188
189 au1xxx_dbdma_stop(pcd->ddma_chan);
190 au1xxx_dbdma_reset(pcd->ddma_chan);
191
192out:
193 return 0;
194}
195
196static inline struct au1xpsc_audio_dmadata *to_dmadata(struct snd_pcm_substream *ss)
197{
198 struct snd_soc_pcm_runtime *rtd = ss->private_data;
199 struct au1xpsc_audio_dmadata *pcd =
200 snd_soc_platform_get_drvdata(rtd->platform);
201 return &pcd[SUBSTREAM_TYPE(ss)];
202}
203
204static int au1xpsc_pcm_hw_params(struct snd_pcm_substream *substream,
205 struct snd_pcm_hw_params *params)
206{
207 struct snd_pcm_runtime *runtime = substream->runtime;
208 struct au1xpsc_audio_dmadata *pcd;
209 int stype, ret;
210
211 ret = snd_pcm_lib_malloc_pages(substream, params_buffer_bytes(params));
212 if (ret < 0)
213 goto out;
214
215 stype = SUBSTREAM_TYPE(substream);
216 pcd = to_dmadata(substream);
217
218 DBG("runtime->dma_area = 0x%08lx dma_addr_t = 0x%08lx dma_size = %d "
219 "runtime->min_align %d\n",
220 (unsigned long)runtime->dma_area,
221 (unsigned long)runtime->dma_addr, runtime->dma_bytes,
222 runtime->min_align);
223
224 DBG("bits %d frags %d frag_bytes %d is_rx %d\n", params->msbits,
225 params_periods(params), params_period_bytes(params), stype);
226
227 ret = au1x_pcm_dbdma_realloc(pcd, stype, params->msbits);
228 if (ret) {
229 MSG("DDMA channel (re)alloc failed!\n");
230 goto out;
231 }
232
233 pcd->substream = substream;
234 pcd->period_bytes = params_period_bytes(params);
235 pcd->periods = params_periods(params);
236 pcd->dma_area_s = pcd->dma_area = runtime->dma_addr;
237 pcd->q_period = 0;
238 pcd->curr_period = 0;
239 pcd->pos = 0;
240
241 ret = 0;
242out:
243 return ret;
244}
245
246static int au1xpsc_pcm_hw_free(struct snd_pcm_substream *substream)
247{
248 snd_pcm_lib_free_pages(substream);
249 return 0;
250}
251
252static int au1xpsc_pcm_prepare(struct snd_pcm_substream *substream)
253{
254 struct au1xpsc_audio_dmadata *pcd = to_dmadata(substream);
255
256 au1xxx_dbdma_reset(pcd->ddma_chan);
257
258 if (SUBSTREAM_TYPE(substream) == PCM_RX) {
259 au1x_pcm_queue_rx(pcd);
260 au1x_pcm_queue_rx(pcd);
261 } else {
262 au1x_pcm_queue_tx(pcd);
263 au1x_pcm_queue_tx(pcd);
264 }
265
266 return 0;
267}
268
269static int au1xpsc_pcm_trigger(struct snd_pcm_substream *substream, int cmd)
270{
271 u32 c = to_dmadata(substream)->ddma_chan;
272
273 switch (cmd) {
274 case SNDRV_PCM_TRIGGER_START:
275 case SNDRV_PCM_TRIGGER_RESUME:
276 au1xxx_dbdma_start(c);
277 break;
278 case SNDRV_PCM_TRIGGER_STOP:
279 case SNDRV_PCM_TRIGGER_SUSPEND:
280 au1xxx_dbdma_stop(c);
281 break;
282 default:
283 return -EINVAL;
284 }
285 return 0;
286}
287
288static snd_pcm_uframes_t
289au1xpsc_pcm_pointer(struct snd_pcm_substream *substream)
290{
291 return bytes_to_frames(substream->runtime, to_dmadata(substream)->pos);
292}
293
294static int au1xpsc_pcm_open(struct snd_pcm_substream *substream)
295{
296 snd_soc_set_runtime_hwparams(substream, &au1xpsc_pcm_hardware);
297 return 0;
298}
299
300static int au1xpsc_pcm_close(struct snd_pcm_substream *substream)
301{
302 au1x_pcm_dbdma_free(to_dmadata(substream));
303 return 0;
304}
305
306static struct snd_pcm_ops au1xpsc_pcm_ops = {
307 .open = au1xpsc_pcm_open,
308 .close = au1xpsc_pcm_close,
309 .ioctl = snd_pcm_lib_ioctl,
310 .hw_params = au1xpsc_pcm_hw_params,
311 .hw_free = au1xpsc_pcm_hw_free,
312 .prepare = au1xpsc_pcm_prepare,
313 .trigger = au1xpsc_pcm_trigger,
314 .pointer = au1xpsc_pcm_pointer,
315};
316
317static void au1xpsc_pcm_free_dma_buffers(struct snd_pcm *pcm)
318{
319 snd_pcm_lib_preallocate_free_for_all(pcm);
320}
321
322static int au1xpsc_pcm_new(struct snd_soc_pcm_runtime *rtd)
323{
324 struct snd_card *card = rtd->card->snd_card;
325 struct snd_pcm *pcm = rtd->pcm;
326
327 snd_pcm_lib_preallocate_pages_for_all(pcm, SNDRV_DMA_TYPE_DEV,
328 card->dev, AU1XPSC_BUFFER_MIN_BYTES, (4096 * 1024) - 1);
329
330 return 0;
331}
332
333/* au1xpsc audio platform */
334struct snd_soc_platform_driver au1xpsc_soc_platform = {
335 .ops = &au1xpsc_pcm_ops,
336 .pcm_new = au1xpsc_pcm_new,
337 .pcm_free = au1xpsc_pcm_free_dma_buffers,
338};
339
340static int __devinit au1xpsc_pcm_drvprobe(struct platform_device *pdev)
341{
342 struct au1xpsc_audio_dmadata *dmadata;
343 struct resource *r;
344 int ret;
345
346 dmadata = kzalloc(2 * sizeof(struct au1xpsc_audio_dmadata), GFP_KERNEL);
347 if (!dmadata)
348 return -ENOMEM;
349
350 r = platform_get_resource(pdev, IORESOURCE_DMA, 0);
351 if (!r) {
352 ret = -ENODEV;
353 goto out1;
354 }
355 dmadata[PCM_TX].ddma_id = r->start;
356
357 /* RX DMA */
358 r = platform_get_resource(pdev, IORESOURCE_DMA, 1);
359 if (!r) {
360 ret = -ENODEV;
361 goto out1;
362 }
363 dmadata[PCM_RX].ddma_id = r->start;
364
365 platform_set_drvdata(pdev, dmadata);
366
367 ret = snd_soc_register_platform(&pdev->dev, &au1xpsc_soc_platform);
368 if (!ret)
369 return ret;
370
371out1:
372 kfree(dmadata);
373 return ret;
374}
375
376static int __devexit au1xpsc_pcm_drvremove(struct platform_device *pdev)
377{
378 struct au1xpsc_audio_dmadata *dmadata = platform_get_drvdata(pdev);
379
380 snd_soc_unregister_platform(&pdev->dev);
381 kfree(dmadata);
382
383 return 0;
384}
385
386static struct platform_driver au1xpsc_pcm_driver = {
387 .driver = {
388 .name = "au1xpsc-pcm",
389 .owner = THIS_MODULE,
390 },
391 .probe = au1xpsc_pcm_drvprobe,
392 .remove = __devexit_p(au1xpsc_pcm_drvremove),
393};
394
395static int __init au1xpsc_audio_dbdma_load(void)
396{
397 return platform_driver_register(&au1xpsc_pcm_driver);
398}
399
400static void __exit au1xpsc_audio_dbdma_unload(void)
401{
402 platform_driver_unregister(&au1xpsc_pcm_driver);
403}
404
405module_init(au1xpsc_audio_dbdma_load);
406module_exit(au1xpsc_audio_dbdma_unload);
407
408
409struct platform_device *au1xpsc_pcm_add(struct platform_device *pdev)
410{
411 struct resource *res, *r;
412 struct platform_device *pd;
413 int id[2];
414 int ret;
415
416 r = platform_get_resource(pdev, IORESOURCE_DMA, 0);
417 if (!r)
418 return NULL;
419 id[0] = r->start;
420
421 r = platform_get_resource(pdev, IORESOURCE_DMA, 1);
422 if (!r)
423 return NULL;
424 id[1] = r->start;
425
426 res = kzalloc(sizeof(struct resource) * 2, GFP_KERNEL);
427 if (!res)
428 return NULL;
429
430 res[0].start = res[0].end = id[0];
431 res[1].start = res[1].end = id[1];
432 res[0].flags = res[1].flags = IORESOURCE_DMA;
433
434 pd = platform_device_alloc("au1xpsc-pcm", pdev->id);
435 if (!pd)
436 goto out;
437
438 pd->resource = res;
439 pd->num_resources = 2;
440
441 ret = platform_device_add(pd);
442 if (!ret)
443 return pd;
444
445 platform_device_put(pd);
446out:
447 kfree(res);
448 return NULL;
449}
450EXPORT_SYMBOL_GPL(au1xpsc_pcm_add);
451
452void au1xpsc_pcm_destroy(struct platform_device *dmapd)
453{
454 if (dmapd)
455 platform_device_unregister(dmapd);
456}
457EXPORT_SYMBOL_GPL(au1xpsc_pcm_destroy);
458
459MODULE_LICENSE("GPL");
460MODULE_DESCRIPTION("Au12x0/Au1550 PSC Audio DMA driver");
461MODULE_AUTHOR("Manuel Lauss");