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Manuel Laussaef3b062007-05-14 18:40:07 +02001/*
2 * SH7760 ("camelot") DMABRG audio DMA unit support
3 *
4 * Copyright (C) 2007 Manuel Lauss <mano@roarinelk.homelinux.net>
5 * licensed under the terms outlined in the file COPYING at the root
6 * of the linux kernel sources.
7 *
8 * The SH7760 DMABRG provides 4 dma channels (2x rec, 2x play), which
9 * trigger an interrupt when one half of the programmed transfer size
10 * has been xmitted.
11 *
12 * FIXME: little-endian only for now
13 */
14
15#include <linux/module.h>
Tejun Heo5a0e3ad2010-03-24 17:04:11 +090016#include <linux/gfp.h>
Manuel Laussaef3b062007-05-14 18:40:07 +020017#include <linux/init.h>
18#include <linux/platform_device.h>
19#include <linux/dma-mapping.h>
Manuel Laussaef3b062007-05-14 18:40:07 +020020#include <sound/core.h>
21#include <sound/pcm.h>
22#include <sound/pcm_params.h>
23#include <sound/soc.h>
24#include <asm/dmabrg.h>
25
26
27/* registers and bits */
28#define BRGATXSAR 0x00
29#define BRGARXDAR 0x04
30#define BRGATXTCR 0x08
31#define BRGARXTCR 0x0C
32#define BRGACR 0x10
33#define BRGATXTCNT 0x14
34#define BRGARXTCNT 0x18
35
36#define ACR_RAR (1 << 18)
37#define ACR_RDS (1 << 17)
38#define ACR_RDE (1 << 16)
39#define ACR_TAR (1 << 2)
40#define ACR_TDS (1 << 1)
41#define ACR_TDE (1 << 0)
42
43/* receiver/transmitter data alignment */
44#define ACR_RAM_NONE (0 << 24)
45#define ACR_RAM_4BYTE (1 << 24)
46#define ACR_RAM_2WORD (2 << 24)
47#define ACR_TAM_NONE (0 << 8)
48#define ACR_TAM_4BYTE (1 << 8)
49#define ACR_TAM_2WORD (2 << 8)
50
51
52struct camelot_pcm {
53 unsigned long mmio; /* DMABRG audio channel control reg MMIO */
54 unsigned int txid; /* ID of first DMABRG IRQ for this unit */
55
56 struct snd_pcm_substream *tx_ss;
57 unsigned long tx_period_size;
58 unsigned int tx_period;
59
60 struct snd_pcm_substream *rx_ss;
61 unsigned long rx_period_size;
62 unsigned int rx_period;
63
64} cam_pcm_data[2] = {
65 {
66 .mmio = 0xFE3C0040,
67 .txid = DMABRGIRQ_A0TXF,
68 },
69 {
70 .mmio = 0xFE3C0060,
71 .txid = DMABRGIRQ_A1TXF,
72 },
73};
74
75#define BRGREG(x) (*(unsigned long *)(cam->mmio + (x)))
76
77/*
78 * set a minimum of 16kb per period, to avoid interrupt-"storm" and
79 * resulting skipping. In general, the bigger the minimum size, the
80 * better for overall system performance. (The SH7760 is a puny CPU
81 * with a slow SDRAM interface and poor internal bus bandwidth,
82 * *especially* when the LCDC is active). The minimum for the DMAC
83 * is 8 bytes; 16kbytes are enough to get skip-free playback of a
84 * 44kHz/16bit/stereo MP3 on a lightly loaded system, and maintain
85 * reasonable responsiveness in MPlayer.
86 */
87#define DMABRG_PERIOD_MIN 16 * 1024
88#define DMABRG_PERIOD_MAX 0x03fffffc
89#define DMABRG_PREALLOC_BUFFER 32 * 1024
90#define DMABRG_PREALLOC_BUFFER_MAX 32 * 1024
91
Manuel Laussaef3b062007-05-14 18:40:07 +020092static struct snd_pcm_hardware camelot_pcm_hardware = {
93 .info = (SNDRV_PCM_INFO_MMAP |
94 SNDRV_PCM_INFO_INTERLEAVED |
95 SNDRV_PCM_INFO_BLOCK_TRANSFER |
Takashi Iwai2008f132009-04-28 12:25:59 +020096 SNDRV_PCM_INFO_MMAP_VALID |
97 SNDRV_PCM_INFO_BATCH),
Manuel Laussaef3b062007-05-14 18:40:07 +020098 .buffer_bytes_max = DMABRG_PERIOD_MAX,
99 .period_bytes_min = DMABRG_PERIOD_MIN,
100 .period_bytes_max = DMABRG_PERIOD_MAX / 2,
101 .periods_min = 2,
102 .periods_max = 2,
103 .fifo_size = 128,
104};
105
106static void camelot_txdma(void *data)
107{
108 struct camelot_pcm *cam = data;
109 cam->tx_period ^= 1;
110 snd_pcm_period_elapsed(cam->tx_ss);
111}
112
113static void camelot_rxdma(void *data)
114{
115 struct camelot_pcm *cam = data;
116 cam->rx_period ^= 1;
117 snd_pcm_period_elapsed(cam->rx_ss);
118}
119
120static int camelot_pcm_open(struct snd_pcm_substream *substream)
121{
122 struct snd_soc_pcm_runtime *rtd = substream->private_data;
Liam Girdwoodf0fba2a2010-03-17 20:15:21 +0000123 struct camelot_pcm *cam = &cam_pcm_data[rtd->cpu_dai->id];
Manuel Laussaef3b062007-05-14 18:40:07 +0200124 int recv = substream->stream == SNDRV_PCM_STREAM_PLAYBACK ? 0:1;
125 int ret, dmairq;
126
127 snd_soc_set_runtime_hwparams(substream, &camelot_pcm_hardware);
128
129 /* DMABRG buffer half/full events */
130 dmairq = (recv) ? cam->txid + 2 : cam->txid;
131 if (recv) {
132 cam->rx_ss = substream;
133 ret = dmabrg_request_irq(dmairq, camelot_rxdma, cam);
134 if (unlikely(ret)) {
135 pr_debug("audio unit %d irqs already taken!\n",
Liam Girdwoodf0fba2a2010-03-17 20:15:21 +0000136 rtd->cpu_dai->id);
Manuel Laussaef3b062007-05-14 18:40:07 +0200137 return -EBUSY;
138 }
139 (void)dmabrg_request_irq(dmairq + 1,camelot_rxdma, cam);
140 } else {
141 cam->tx_ss = substream;
142 ret = dmabrg_request_irq(dmairq, camelot_txdma, cam);
143 if (unlikely(ret)) {
144 pr_debug("audio unit %d irqs already taken!\n",
Liam Girdwoodf0fba2a2010-03-17 20:15:21 +0000145 rtd->cpu_dai->id);
Manuel Laussaef3b062007-05-14 18:40:07 +0200146 return -EBUSY;
147 }
148 (void)dmabrg_request_irq(dmairq + 1, camelot_txdma, cam);
149 }
150 return 0;
151}
152
153static int camelot_pcm_close(struct snd_pcm_substream *substream)
154{
155 struct snd_soc_pcm_runtime *rtd = substream->private_data;
Liam Girdwoodf0fba2a2010-03-17 20:15:21 +0000156 struct camelot_pcm *cam = &cam_pcm_data[rtd->cpu_dai->id];
Manuel Laussaef3b062007-05-14 18:40:07 +0200157 int recv = substream->stream == SNDRV_PCM_STREAM_PLAYBACK ? 0:1;
158 int dmairq;
159
160 dmairq = (recv) ? cam->txid + 2 : cam->txid;
161
162 if (recv)
163 cam->rx_ss = NULL;
164 else
165 cam->tx_ss = NULL;
166
167 dmabrg_free_irq(dmairq + 1);
168 dmabrg_free_irq(dmairq);
169
170 return 0;
171}
172
173static int camelot_hw_params(struct snd_pcm_substream *substream,
174 struct snd_pcm_hw_params *hw_params)
175{
176 struct snd_soc_pcm_runtime *rtd = substream->private_data;
Liam Girdwoodf0fba2a2010-03-17 20:15:21 +0000177 struct camelot_pcm *cam = &cam_pcm_data[rtd->cpu_dai->id];
Manuel Laussaef3b062007-05-14 18:40:07 +0200178 int recv = substream->stream == SNDRV_PCM_STREAM_PLAYBACK ? 0:1;
179 int ret;
180
181 ret = snd_pcm_lib_malloc_pages(substream,
182 params_buffer_bytes(hw_params));
183 if (ret < 0)
184 return ret;
185
186 if (recv) {
187 cam->rx_period_size = params_period_bytes(hw_params);
188 cam->rx_period = 0;
189 } else {
190 cam->tx_period_size = params_period_bytes(hw_params);
191 cam->tx_period = 0;
192 }
193 return 0;
194}
195
196static int camelot_hw_free(struct snd_pcm_substream *substream)
197{
198 return snd_pcm_lib_free_pages(substream);
199}
200
201static int camelot_prepare(struct snd_pcm_substream *substream)
202{
203 struct snd_pcm_runtime *runtime = substream->runtime;
204 struct snd_soc_pcm_runtime *rtd = substream->private_data;
Liam Girdwoodf0fba2a2010-03-17 20:15:21 +0000205 struct camelot_pcm *cam = &cam_pcm_data[rtd->cpu_dai->id];
Manuel Laussaef3b062007-05-14 18:40:07 +0200206
207 pr_debug("PCM data: addr 0x%08ulx len %d\n",
208 (u32)runtime->dma_addr, runtime->dma_bytes);
209
210 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {
211 BRGREG(BRGATXSAR) = (unsigned long)runtime->dma_area;
212 BRGREG(BRGATXTCR) = runtime->dma_bytes;
213 } else {
214 BRGREG(BRGARXDAR) = (unsigned long)runtime->dma_area;
215 BRGREG(BRGARXTCR) = runtime->dma_bytes;
216 }
217
218 return 0;
219}
220
221static inline void dmabrg_play_dma_start(struct camelot_pcm *cam)
222{
223 unsigned long acr = BRGREG(BRGACR) & ~(ACR_TDS | ACR_RDS);
224 /* start DMABRG engine: XFER start, auto-addr-reload */
225 BRGREG(BRGACR) = acr | ACR_TDE | ACR_TAR | ACR_TAM_2WORD;
226}
227
228static inline void dmabrg_play_dma_stop(struct camelot_pcm *cam)
229{
230 unsigned long acr = BRGREG(BRGACR) & ~(ACR_TDS | ACR_RDS);
231 /* forcibly terminate data transmission */
232 BRGREG(BRGACR) = acr | ACR_TDS;
233}
234
235static inline void dmabrg_rec_dma_start(struct camelot_pcm *cam)
236{
237 unsigned long acr = BRGREG(BRGACR) & ~(ACR_TDS | ACR_RDS);
238 /* start DMABRG engine: recv start, auto-reload */
239 BRGREG(BRGACR) = acr | ACR_RDE | ACR_RAR | ACR_RAM_2WORD;
240}
241
242static inline void dmabrg_rec_dma_stop(struct camelot_pcm *cam)
243{
244 unsigned long acr = BRGREG(BRGACR) & ~(ACR_TDS | ACR_RDS);
245 /* forcibly terminate data receiver */
246 BRGREG(BRGACR) = acr | ACR_RDS;
247}
248
249static int camelot_trigger(struct snd_pcm_substream *substream, int cmd)
250{
251 struct snd_soc_pcm_runtime *rtd = substream->private_data;
Liam Girdwoodf0fba2a2010-03-17 20:15:21 +0000252 struct camelot_pcm *cam = &cam_pcm_data[rtd->cpu_dai->id];
Manuel Laussaef3b062007-05-14 18:40:07 +0200253 int recv = substream->stream == SNDRV_PCM_STREAM_PLAYBACK ? 0:1;
254
255 switch (cmd) {
256 case SNDRV_PCM_TRIGGER_START:
257 if (recv)
258 dmabrg_rec_dma_start(cam);
259 else
260 dmabrg_play_dma_start(cam);
261 break;
262 case SNDRV_PCM_TRIGGER_STOP:
263 if (recv)
264 dmabrg_rec_dma_stop(cam);
265 else
266 dmabrg_play_dma_stop(cam);
267 break;
268 default:
269 return -EINVAL;
270 }
271
272 return 0;
273}
274
275static snd_pcm_uframes_t camelot_pos(struct snd_pcm_substream *substream)
276{
277 struct snd_pcm_runtime *runtime = substream->runtime;
278 struct snd_soc_pcm_runtime *rtd = substream->private_data;
Liam Girdwoodf0fba2a2010-03-17 20:15:21 +0000279 struct camelot_pcm *cam = &cam_pcm_data[rtd->cpu_dai->id];
Manuel Laussaef3b062007-05-14 18:40:07 +0200280 int recv = substream->stream == SNDRV_PCM_STREAM_PLAYBACK ? 0:1;
281 unsigned long pos;
282
283 /* cannot use the DMABRG pointer register: under load, by the
284 * time ALSA comes around to read the register, it is already
285 * far ahead (or worse, already done with the fragment) of the
286 * position at the time the IRQ was triggered, which results in
287 * fast-playback sound in my test application (ScummVM)
288 */
289 if (recv)
290 pos = cam->rx_period ? cam->rx_period_size : 0;
291 else
292 pos = cam->tx_period ? cam->tx_period_size : 0;
293
294 return bytes_to_frames(runtime, pos);
295}
296
297static struct snd_pcm_ops camelot_pcm_ops = {
298 .open = camelot_pcm_open,
299 .close = camelot_pcm_close,
300 .ioctl = snd_pcm_lib_ioctl,
301 .hw_params = camelot_hw_params,
302 .hw_free = camelot_hw_free,
303 .prepare = camelot_prepare,
304 .trigger = camelot_trigger,
305 .pointer = camelot_pos,
306};
307
Liam Girdwood552d1ef2011-06-07 16:08:33 +0100308static int camelot_pcm_new(struct snd_soc_pcm_runtime *rtd)
Manuel Laussaef3b062007-05-14 18:40:07 +0200309{
Liam Girdwood552d1ef2011-06-07 16:08:33 +0100310 struct snd_pcm *pcm = rtd->pcm;
311
Manuel Laussaef3b062007-05-14 18:40:07 +0200312 /* dont use SNDRV_DMA_TYPE_DEV, since it will oops the SH kernel
313 * in MMAP mode (i.e. aplay -M)
314 */
315 snd_pcm_lib_preallocate_pages_for_all(pcm,
316 SNDRV_DMA_TYPE_CONTINUOUS,
317 snd_dma_continuous_data(GFP_KERNEL),
318 DMABRG_PREALLOC_BUFFER, DMABRG_PREALLOC_BUFFER_MAX);
319
320 return 0;
321}
322
Lars-Peter Clausen417a1172013-03-15 11:26:15 +0100323static struct snd_soc_platform_driver sh7760_soc_platform = {
324 .ops = &camelot_pcm_ops,
Manuel Laussaef3b062007-05-14 18:40:07 +0200325 .pcm_new = camelot_pcm_new,
Manuel Laussaef3b062007-05-14 18:40:07 +0200326};
Manuel Laussaef3b062007-05-14 18:40:07 +0200327
Bill Pembertonbb5eb6e2012-12-07 09:26:31 -0500328static int sh7760_soc_platform_probe(struct platform_device *pdev)
Mark Brown958e7922008-12-03 19:58:17 +0000329{
Liam Girdwoodf0fba2a2010-03-17 20:15:21 +0000330 return snd_soc_register_platform(&pdev->dev, &sh7760_soc_platform);
Mark Brown958e7922008-12-03 19:58:17 +0000331}
Mark Brown958e7922008-12-03 19:58:17 +0000332
Bill Pembertonbb5eb6e2012-12-07 09:26:31 -0500333static int sh7760_soc_platform_remove(struct platform_device *pdev)
Mark Brown958e7922008-12-03 19:58:17 +0000334{
Liam Girdwoodf0fba2a2010-03-17 20:15:21 +0000335 snd_soc_unregister_platform(&pdev->dev);
336 return 0;
Mark Brown958e7922008-12-03 19:58:17 +0000337}
Liam Girdwoodf0fba2a2010-03-17 20:15:21 +0000338
339static struct platform_driver sh7760_pcm_driver = {
340 .driver = {
341 .name = "sh7760-pcm-audio",
Liam Girdwoodf0fba2a2010-03-17 20:15:21 +0000342 },
343
344 .probe = sh7760_soc_platform_probe,
Bill Pembertonbb5eb6e2012-12-07 09:26:31 -0500345 .remove = sh7760_soc_platform_remove,
Liam Girdwoodf0fba2a2010-03-17 20:15:21 +0000346};
347
Axel Lincb5e8732011-11-25 10:15:07 +0800348module_platform_driver(sh7760_pcm_driver);
Mark Brown958e7922008-12-03 19:58:17 +0000349
Manuel Laussaef3b062007-05-14 18:40:07 +0200350MODULE_LICENSE("GPL");
351MODULE_DESCRIPTION("SH7760 Audio DMA (DMABRG) driver");
352MODULE_AUTHOR("Manuel Lauss <mano@roarinelk.homelinux.net>");