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ixgbevf: Fix checksum error when using stacked vlan
[linux/fpc-iii.git] / sound / soc / kirkwood / kirkwood-dma.c
blob4cf2245950d79e91cf343ed9658f51f4fd3dc6df
1 /*
2 * kirkwood-dma.c
3 *
4 * (c) 2010 Arnaud Patard <apatard@mandriva.com>
5 * (c) 2010 Arnaud Patard <arnaud.patard@rtp-net.org>
6 *
7 * This program is free software; you can redistribute it and/or modify it
8 * under the terms of the GNU General Public License as published by the
9 * Free Software Foundation; either version 2 of the License, or (at your
10 * option) any later version.
11 */
12
13 #include <linux/init.h>
14 #include <linux/module.h>
15 #include <linux/device.h>
16 #include <linux/io.h>
17 #include <linux/slab.h>
18 #include <linux/interrupt.h>
19 #include <linux/dma-mapping.h>
20 #include <linux/mbus.h>
21 #include <sound/soc.h>
22 #include "kirkwood.h"
23
24 static struct kirkwood_dma_data *kirkwood_priv(struct snd_pcm_substream *subs)
25 {
26 struct snd_soc_pcm_runtime *soc_runtime = subs->private_data;
27 return snd_soc_dai_get_drvdata(soc_runtime->cpu_dai);
28 }
29
30 static struct snd_pcm_hardware kirkwood_dma_snd_hw = {
31 .info = SNDRV_PCM_INFO_INTERLEAVED |
32 SNDRV_PCM_INFO_MMAP |
33 SNDRV_PCM_INFO_MMAP_VALID |
34 SNDRV_PCM_INFO_BLOCK_TRANSFER |
35 SNDRV_PCM_INFO_PAUSE |
36 SNDRV_PCM_INFO_NO_PERIOD_WAKEUP,
37 .buffer_bytes_max = KIRKWOOD_SND_MAX_BUFFER_BYTES,
38 .period_bytes_min = KIRKWOOD_SND_MIN_PERIOD_BYTES,
39 .period_bytes_max = KIRKWOOD_SND_MAX_PERIOD_BYTES,
40 .periods_min = KIRKWOOD_SND_MIN_PERIODS,
41 .periods_max = KIRKWOOD_SND_MAX_PERIODS,
42 .fifo_size = 0,
43 };
44
45 static irqreturn_t kirkwood_dma_irq(int irq, void *dev_id)
46 {
47 struct kirkwood_dma_data *priv = dev_id;
48 unsigned long mask, status, cause;
49
50 mask = readl(priv->io + KIRKWOOD_INT_MASK);
51 status = readl(priv->io + KIRKWOOD_INT_CAUSE) & mask;
52
53 cause = readl(priv->io + KIRKWOOD_ERR_CAUSE);
54 if (unlikely(cause)) {
55 printk(KERN_WARNING "%s: got err interrupt 0x%lx\n",
56 __func__, cause);
57 writel(cause, priv->io + KIRKWOOD_ERR_CAUSE);
58 }
59
60 /* we've enabled only bytes interrupts ... */
61 if (status & ~(KIRKWOOD_INT_CAUSE_PLAY_BYTES | \
62 KIRKWOOD_INT_CAUSE_REC_BYTES)) {
63 printk(KERN_WARNING "%s: unexpected interrupt %lx\n",
64 __func__, status);
65 return IRQ_NONE;
66 }
67
68 /* ack int */
69 writel(status, priv->io + KIRKWOOD_INT_CAUSE);
70
71 if (status & KIRKWOOD_INT_CAUSE_PLAY_BYTES)
72 snd_pcm_period_elapsed(priv->substream_play);
73
74 if (status & KIRKWOOD_INT_CAUSE_REC_BYTES)
75 snd_pcm_period_elapsed(priv->substream_rec);
76
77 return IRQ_HANDLED;
78 }
79
80 static void
81 kirkwood_dma_conf_mbus_windows(void __iomem *base, int win,
82 unsigned long dma,
83 const struct mbus_dram_target_info *dram)
84 {
85 int i;
86
87 /* First disable and clear windows */
88 writel(0, base + KIRKWOOD_AUDIO_WIN_CTRL_REG(win));
89 writel(0, base + KIRKWOOD_AUDIO_WIN_BASE_REG(win));
90
91 /* try to find matching cs for current dma address */
92 for (i = 0; i < dram->num_cs; i++) {
93 const struct mbus_dram_window *cs = dram->cs + i;
94 if ((cs->base & 0xffff0000) < (dma & 0xffff0000)) {
95 writel(cs->base & 0xffff0000,
96 base + KIRKWOOD_AUDIO_WIN_BASE_REG(win));
97 writel(((cs->size - 1) & 0xffff0000) |
98 (cs->mbus_attr << 8) |
99 (dram->mbus_dram_target_id << 4) | 1,
100 base + KIRKWOOD_AUDIO_WIN_CTRL_REG(win));
101 }
102 }
103 }
104
105 static int kirkwood_dma_open(struct snd_pcm_substream *substream)
106 {
107 int err;
108 struct snd_pcm_runtime *runtime = substream->runtime;
109 struct kirkwood_dma_data *priv = kirkwood_priv(substream);
110 const struct mbus_dram_target_info *dram;
111 unsigned long addr;
112
113 snd_soc_set_runtime_hwparams(substream, &kirkwood_dma_snd_hw);
114
115 /* Ensure that all constraints linked to dma burst are fulfilled */
116 err = snd_pcm_hw_constraint_minmax(runtime,
117 SNDRV_PCM_HW_PARAM_BUFFER_BYTES,
118 priv->burst * 2,
119 KIRKWOOD_AUDIO_BUF_MAX-1);
120 if (err < 0)
121 return err;
122
123 err = snd_pcm_hw_constraint_step(runtime, 0,
124 SNDRV_PCM_HW_PARAM_BUFFER_BYTES,
125 priv->burst);
126 if (err < 0)
127 return err;
128
129 err = snd_pcm_hw_constraint_step(substream->runtime, 0,
130 SNDRV_PCM_HW_PARAM_PERIOD_BYTES,
131 priv->burst);
132 if (err < 0)
133 return err;
134
135 if (!priv->substream_play && !priv->substream_rec) {
136 err = request_irq(priv->irq, kirkwood_dma_irq, IRQF_SHARED,
137 "kirkwood-i2s", priv);
138 if (err)
139 return -EBUSY;
140
141 /*
142 * Enable Error interrupts. We're only ack'ing them but
143 * it's useful for diagnostics
144 */
145 writel((unsigned int)-1, priv->io + KIRKWOOD_ERR_MASK);
146 }
147
148 dram = mv_mbus_dram_info();
149 addr = substream->dma_buffer.addr;
150 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {
151 priv->substream_play = substream;
152 kirkwood_dma_conf_mbus_windows(priv->io,
153 KIRKWOOD_PLAYBACK_WIN, addr, dram);
154 } else {
155 priv->substream_rec = substream;
156 kirkwood_dma_conf_mbus_windows(priv->io,
157 KIRKWOOD_RECORD_WIN, addr, dram);
158 }
159
160 return 0;
161 }
162
163 static int kirkwood_dma_close(struct snd_pcm_substream *substream)
164 {
165 struct kirkwood_dma_data *priv = kirkwood_priv(substream);
166
167 if (!priv)
168 return 0;
169
170 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
171 priv->substream_play = NULL;
172 else
173 priv->substream_rec = NULL;
174
175 if (!priv->substream_play && !priv->substream_rec) {
176 writel(0, priv->io + KIRKWOOD_ERR_MASK);
177 free_irq(priv->irq, priv);
178 }
179
180 return 0;
181 }
182
183 static int kirkwood_dma_hw_params(struct snd_pcm_substream *substream,
184 struct snd_pcm_hw_params *params)
185 {
186 struct snd_pcm_runtime *runtime = substream->runtime;
187
188 snd_pcm_set_runtime_buffer(substream, &substream->dma_buffer);
189 runtime->dma_bytes = params_buffer_bytes(params);
190
191 return 0;
192 }
193
194 static int kirkwood_dma_hw_free(struct snd_pcm_substream *substream)
195 {
196 snd_pcm_set_runtime_buffer(substream, NULL);
197 return 0;
198 }
199
200 static int kirkwood_dma_prepare(struct snd_pcm_substream *substream)
201 {
202 struct snd_pcm_runtime *runtime = substream->runtime;
203 struct kirkwood_dma_data *priv = kirkwood_priv(substream);
204 unsigned long size, count;
205
206 /* compute buffer size in term of "words" as requested in specs */
207 size = frames_to_bytes(runtime, runtime->buffer_size);
208 size = (size>>2)-1;
209 count = snd_pcm_lib_period_bytes(substream);
210
211 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {
212 writel(count, priv->io + KIRKWOOD_PLAY_BYTE_INT_COUNT);
213 writel(runtime->dma_addr, priv->io + KIRKWOOD_PLAY_BUF_ADDR);
214 writel(size, priv->io + KIRKWOOD_PLAY_BUF_SIZE);
215 } else {
216 writel(count, priv->io + KIRKWOOD_REC_BYTE_INT_COUNT);
217 writel(runtime->dma_addr, priv->io + KIRKWOOD_REC_BUF_ADDR);
218 writel(size, priv->io + KIRKWOOD_REC_BUF_SIZE);
219 }
220
221
222 return 0;
223 }
224
225 static snd_pcm_uframes_t kirkwood_dma_pointer(struct snd_pcm_substream
226 *substream)
227 {
228 struct kirkwood_dma_data *priv = kirkwood_priv(substream);
229 snd_pcm_uframes_t count;
230
231 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
232 count = bytes_to_frames(substream->runtime,
233 readl(priv->io + KIRKWOOD_PLAY_BYTE_COUNT));
234 else
235 count = bytes_to_frames(substream->runtime,
236 readl(priv->io + KIRKWOOD_REC_BYTE_COUNT));
237
238 return count;
239 }
240
241 static struct snd_pcm_ops kirkwood_dma_ops = {
242 .open = kirkwood_dma_open,
243 .close = kirkwood_dma_close,
244 .ioctl = snd_pcm_lib_ioctl,
245 .hw_params = kirkwood_dma_hw_params,
246 .hw_free = kirkwood_dma_hw_free,
247 .prepare = kirkwood_dma_prepare,
248 .pointer = kirkwood_dma_pointer,
249 };
250
251 static int kirkwood_dma_preallocate_dma_buffer(struct snd_pcm *pcm,
252 int stream)
253 {
254 struct snd_pcm_substream *substream = pcm->streams[stream].substream;
255 struct snd_dma_buffer *buf = &substream->dma_buffer;
256 size_t size = kirkwood_dma_snd_hw.buffer_bytes_max;
257
258 buf->dev.type = SNDRV_DMA_TYPE_DEV;
259 buf->dev.dev = pcm->card->dev;
260 buf->area = dma_alloc_coherent(pcm->card->dev, size,
261 &buf->addr, GFP_KERNEL);
262 if (!buf->area)
263 return -ENOMEM;
264 buf->bytes = size;
265 buf->private_data = NULL;
266
267 return 0;
268 }
269
270 static int kirkwood_dma_new(struct snd_soc_pcm_runtime *rtd)
271 {
272 struct snd_card *card = rtd->card->snd_card;
273 struct snd_pcm *pcm = rtd->pcm;
274 int ret;
275
276 ret = dma_coerce_mask_and_coherent(card->dev, DMA_BIT_MASK(32));
277 if (ret)
278 return ret;
279
280 if (pcm->streams[SNDRV_PCM_STREAM_PLAYBACK].substream) {
281 ret = kirkwood_dma_preallocate_dma_buffer(pcm,
282 SNDRV_PCM_STREAM_PLAYBACK);
283 if (ret)
284 return ret;
285 }
286
287 if (pcm->streams[SNDRV_PCM_STREAM_CAPTURE].substream) {
288 ret = kirkwood_dma_preallocate_dma_buffer(pcm,
289 SNDRV_PCM_STREAM_CAPTURE);
290 if (ret)
291 return ret;
292 }
293
294 return 0;
295 }
296
297 static void kirkwood_dma_free_dma_buffers(struct snd_pcm *pcm)
298 {
299 struct snd_pcm_substream *substream;
300 struct snd_dma_buffer *buf;
301 int stream;
302
303 for (stream = 0; stream < 2; stream++) {
304 substream = pcm->streams[stream].substream;
305 if (!substream)
306 continue;
307 buf = &substream->dma_buffer;
308 if (!buf->area)
309 continue;
310
311 dma_free_coherent(pcm->card->dev, buf->bytes,
312 buf->area, buf->addr);
313 buf->area = NULL;
314 }
315 }
316
317 struct snd_soc_platform_driver kirkwood_soc_platform = {
318 .ops = &kirkwood_dma_ops,
319 .pcm_new = kirkwood_dma_new,
320 .pcm_free = kirkwood_dma_free_dma_buffers,
321 };
Linux with added FPC-III support