1 // SPDX-License-Identifier: GPL-2.0-or-later <<
2 /* 1 /*
3 * kirkwood-dma.c 2 * kirkwood-dma.c
4 * 3 *
5 * (c) 2010 Arnaud Patard <apatard@mandriva.co 4 * (c) 2010 Arnaud Patard <apatard@mandriva.com>
6 * (c) 2010 Arnaud Patard <arnaud.patard@rtp-n 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.
7 */ 11 */
8 12
9 #include <linux/init.h> 13 #include <linux/init.h>
10 #include <linux/module.h> 14 #include <linux/module.h>
11 #include <linux/device.h> 15 #include <linux/device.h>
12 #include <linux/io.h> 16 #include <linux/io.h>
13 #include <linux/slab.h> 17 #include <linux/slab.h>
14 #include <linux/interrupt.h> 18 #include <linux/interrupt.h>
15 #include <linux/dma-mapping.h> 19 #include <linux/dma-mapping.h>
16 #include <linux/mbus.h> 20 #include <linux/mbus.h>
17 #include <sound/soc.h> 21 #include <sound/soc.h>
18 #include "kirkwood.h" 22 #include "kirkwood.h"
19 23
20 static struct kirkwood_dma_data *kirkwood_priv 24 static struct kirkwood_dma_data *kirkwood_priv(struct snd_pcm_substream *subs)
21 { 25 {
22 struct snd_soc_pcm_runtime *soc_runtim !! 26 struct snd_soc_pcm_runtime *soc_runtime = subs->private_data;
23 return snd_soc_dai_get_drvdata(snd_soc !! 27 return snd_soc_dai_get_drvdata(soc_runtime->cpu_dai);
24 } 28 }
25 29
26 static const struct snd_pcm_hardware kirkwood_ 30 static const struct snd_pcm_hardware kirkwood_dma_snd_hw = {
27 .info = SNDRV_PCM_INFO_INTERLEAVED | 31 .info = SNDRV_PCM_INFO_INTERLEAVED |
28 SNDRV_PCM_INFO_MMAP | 32 SNDRV_PCM_INFO_MMAP |
29 SNDRV_PCM_INFO_MMAP_VALID | 33 SNDRV_PCM_INFO_MMAP_VALID |
30 SNDRV_PCM_INFO_BLOCK_TRANSFER 34 SNDRV_PCM_INFO_BLOCK_TRANSFER |
31 SNDRV_PCM_INFO_PAUSE | 35 SNDRV_PCM_INFO_PAUSE |
32 SNDRV_PCM_INFO_NO_PERIOD_WAKEU 36 SNDRV_PCM_INFO_NO_PERIOD_WAKEUP,
33 .buffer_bytes_max = KIRKWOOD_SND 37 .buffer_bytes_max = KIRKWOOD_SND_MAX_BUFFER_BYTES,
34 .period_bytes_min = KIRKWOOD_SND 38 .period_bytes_min = KIRKWOOD_SND_MIN_PERIOD_BYTES,
35 .period_bytes_max = KIRKWOOD_SND 39 .period_bytes_max = KIRKWOOD_SND_MAX_PERIOD_BYTES,
36 .periods_min = KIRKWOOD_SND 40 .periods_min = KIRKWOOD_SND_MIN_PERIODS,
37 .periods_max = KIRKWOOD_SND 41 .periods_max = KIRKWOOD_SND_MAX_PERIODS,
38 .fifo_size = 0, 42 .fifo_size = 0,
39 }; 43 };
40 44
41 static irqreturn_t kirkwood_dma_irq(int irq, v 45 static irqreturn_t kirkwood_dma_irq(int irq, void *dev_id)
42 { 46 {
43 struct kirkwood_dma_data *priv = dev_i 47 struct kirkwood_dma_data *priv = dev_id;
44 unsigned long mask, status, cause; 48 unsigned long mask, status, cause;
45 49
46 mask = readl(priv->io + KIRKWOOD_INT_M 50 mask = readl(priv->io + KIRKWOOD_INT_MASK);
47 status = readl(priv->io + KIRKWOOD_INT 51 status = readl(priv->io + KIRKWOOD_INT_CAUSE) & mask;
48 52
49 cause = readl(priv->io + KIRKWOOD_ERR_ 53 cause = readl(priv->io + KIRKWOOD_ERR_CAUSE);
50 if (unlikely(cause)) { 54 if (unlikely(cause)) {
51 printk(KERN_WARNING "%s: got e 55 printk(KERN_WARNING "%s: got err interrupt 0x%lx\n",
52 __func__, caus 56 __func__, cause);
53 writel(cause, priv->io + KIRKW 57 writel(cause, priv->io + KIRKWOOD_ERR_CAUSE);
54 } 58 }
55 59
56 /* we've enabled only bytes interrupts 60 /* we've enabled only bytes interrupts ... */
57 if (status & ~(KIRKWOOD_INT_CAUSE_PLAY 61 if (status & ~(KIRKWOOD_INT_CAUSE_PLAY_BYTES | \
58 KIRKWOOD_INT_CAUSE_REC 62 KIRKWOOD_INT_CAUSE_REC_BYTES)) {
59 printk(KERN_WARNING "%s: unexp 63 printk(KERN_WARNING "%s: unexpected interrupt %lx\n",
60 __func__, status); 64 __func__, status);
61 return IRQ_NONE; 65 return IRQ_NONE;
62 } 66 }
63 67
64 /* ack int */ 68 /* ack int */
65 writel(status, priv->io + KIRKWOOD_INT 69 writel(status, priv->io + KIRKWOOD_INT_CAUSE);
66 70
67 if (status & KIRKWOOD_INT_CAUSE_PLAY_B 71 if (status & KIRKWOOD_INT_CAUSE_PLAY_BYTES)
68 snd_pcm_period_elapsed(priv->s 72 snd_pcm_period_elapsed(priv->substream_play);
69 73
70 if (status & KIRKWOOD_INT_CAUSE_REC_BY 74 if (status & KIRKWOOD_INT_CAUSE_REC_BYTES)
71 snd_pcm_period_elapsed(priv->s 75 snd_pcm_period_elapsed(priv->substream_rec);
72 76
73 return IRQ_HANDLED; 77 return IRQ_HANDLED;
74 } 78 }
75 79
76 static void 80 static void
77 kirkwood_dma_conf_mbus_windows(void __iomem *b 81 kirkwood_dma_conf_mbus_windows(void __iomem *base, int win,
78 unsigned long d 82 unsigned long dma,
79 const struct mb 83 const struct mbus_dram_target_info *dram)
80 { 84 {
81 int i; 85 int i;
82 86
83 /* First disable and clear windows */ 87 /* First disable and clear windows */
84 writel(0, base + KIRKWOOD_AUDIO_WIN_CT 88 writel(0, base + KIRKWOOD_AUDIO_WIN_CTRL_REG(win));
85 writel(0, base + KIRKWOOD_AUDIO_WIN_BA 89 writel(0, base + KIRKWOOD_AUDIO_WIN_BASE_REG(win));
86 90
87 /* try to find matching cs for current 91 /* try to find matching cs for current dma address */
88 for (i = 0; i < dram->num_cs; i++) { 92 for (i = 0; i < dram->num_cs; i++) {
89 const struct mbus_dram_window !! 93 const struct mbus_dram_window *cs = dram->cs + i;
90 if ((cs->base & 0xffff0000) < 94 if ((cs->base & 0xffff0000) < (dma & 0xffff0000)) {
91 writel(cs->base & 0xff 95 writel(cs->base & 0xffff0000,
92 base + KIRKWOO 96 base + KIRKWOOD_AUDIO_WIN_BASE_REG(win));
93 writel(((cs->size - 1) 97 writel(((cs->size - 1) & 0xffff0000) |
94 (cs->mbus_attr 98 (cs->mbus_attr << 8) |
95 (dram->mbus_dr 99 (dram->mbus_dram_target_id << 4) | 1,
96 base + KIRKWOO 100 base + KIRKWOOD_AUDIO_WIN_CTRL_REG(win));
97 } 101 }
98 } 102 }
99 } 103 }
100 104
101 static int kirkwood_dma_open(struct snd_soc_co !! 105 static int kirkwood_dma_open(struct snd_pcm_substream *substream)
102 struct snd_pcm_su <<
103 { 106 {
104 int err; 107 int err;
105 struct snd_pcm_runtime *runtime = subs 108 struct snd_pcm_runtime *runtime = substream->runtime;
106 struct kirkwood_dma_data *priv = kirkw 109 struct kirkwood_dma_data *priv = kirkwood_priv(substream);
>> 110 const struct mbus_dram_target_info *dram;
>> 111 unsigned long addr;
107 112
108 snd_soc_set_runtime_hwparams(substream 113 snd_soc_set_runtime_hwparams(substream, &kirkwood_dma_snd_hw);
109 114
110 /* Ensure that all constraints linked 115 /* Ensure that all constraints linked to dma burst are fulfilled */
111 err = snd_pcm_hw_constraint_minmax(run 116 err = snd_pcm_hw_constraint_minmax(runtime,
112 SNDRV_PCM_HW_PARAM_BUF 117 SNDRV_PCM_HW_PARAM_BUFFER_BYTES,
113 priv->burst * 2, 118 priv->burst * 2,
114 KIRKWOOD_AUDIO_BUF_MAX 119 KIRKWOOD_AUDIO_BUF_MAX-1);
115 if (err < 0) 120 if (err < 0)
116 return err; 121 return err;
117 122
118 err = snd_pcm_hw_constraint_step(runti 123 err = snd_pcm_hw_constraint_step(runtime, 0,
119 SNDRV_PCM_HW_PARAM_BUF 124 SNDRV_PCM_HW_PARAM_BUFFER_BYTES,
120 priv->burst); 125 priv->burst);
121 if (err < 0) 126 if (err < 0)
122 return err; 127 return err;
123 128
124 err = snd_pcm_hw_constraint_step(subst 129 err = snd_pcm_hw_constraint_step(substream->runtime, 0,
125 SNDRV_PCM_HW_PARAM_PE 130 SNDRV_PCM_HW_PARAM_PERIOD_BYTES,
126 priv->burst); 131 priv->burst);
127 if (err < 0) 132 if (err < 0)
128 return err; 133 return err;
129 134
130 if (!priv->substream_play && !priv->su 135 if (!priv->substream_play && !priv->substream_rec) {
131 err = request_irq(priv->irq, k 136 err = request_irq(priv->irq, kirkwood_dma_irq, IRQF_SHARED,
132 "kirkwood-i2 137 "kirkwood-i2s", priv);
133 if (err) 138 if (err)
134 return err; !! 139 return -EBUSY;
135 140
136 /* 141 /*
137 * Enable Error interrupts. We 142 * Enable Error interrupts. We're only ack'ing them but
138 * it's useful for diagnostics 143 * it's useful for diagnostics
139 */ 144 */
140 writel((unsigned int)-1, priv- 145 writel((unsigned int)-1, priv->io + KIRKWOOD_ERR_MASK);
141 } 146 }
142 147
>> 148 dram = mv_mbus_dram_info();
>> 149 addr = substream->dma_buffer.addr;
143 if (substream->stream == SNDRV_PCM_STR 150 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {
144 if (priv->substream_play) 151 if (priv->substream_play)
145 return -EBUSY; 152 return -EBUSY;
146 priv->substream_play = substre 153 priv->substream_play = substream;
>> 154 kirkwood_dma_conf_mbus_windows(priv->io,
>> 155 KIRKWOOD_PLAYBACK_WIN, addr, dram);
147 } else { 156 } else {
148 if (priv->substream_rec) 157 if (priv->substream_rec)
149 return -EBUSY; 158 return -EBUSY;
150 priv->substream_rec = substrea 159 priv->substream_rec = substream;
>> 160 kirkwood_dma_conf_mbus_windows(priv->io,
>> 161 KIRKWOOD_RECORD_WIN, addr, dram);
151 } 162 }
152 163
153 return 0; 164 return 0;
154 } 165 }
155 166
156 static int kirkwood_dma_close(struct snd_soc_c !! 167 static int kirkwood_dma_close(struct snd_pcm_substream *substream)
157 struct snd_pcm_s <<
158 { 168 {
159 struct kirkwood_dma_data *priv = kirkw 169 struct kirkwood_dma_data *priv = kirkwood_priv(substream);
160 170
161 if (!priv) 171 if (!priv)
162 return 0; 172 return 0;
163 173
164 if (substream->stream == SNDRV_PCM_STR 174 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
165 priv->substream_play = NULL; 175 priv->substream_play = NULL;
166 else 176 else
167 priv->substream_rec = NULL; 177 priv->substream_rec = NULL;
168 178
169 if (!priv->substream_play && !priv->su 179 if (!priv->substream_play && !priv->substream_rec) {
170 writel(0, priv->io + KIRKWOOD_ 180 writel(0, priv->io + KIRKWOOD_ERR_MASK);
171 free_irq(priv->irq, priv); 181 free_irq(priv->irq, priv);
172 } 182 }
173 183
174 return 0; 184 return 0;
175 } 185 }
176 186
177 static int kirkwood_dma_hw_params(struct snd_s !! 187 static int kirkwood_dma_hw_params(struct snd_pcm_substream *substream,
178 struct snd_p !! 188 struct snd_pcm_hw_params *params)
179 struct snd_p <<
180 { 189 {
181 struct kirkwood_dma_data *priv = kirkw !! 190 struct snd_pcm_runtime *runtime = substream->runtime;
182 const struct mbus_dram_target_info *dr <<
183 unsigned long addr = substream->runtim <<
184 191
185 if (!dram) !! 192 snd_pcm_set_runtime_buffer(substream, &substream->dma_buffer);
186 return 0; !! 193 runtime->dma_bytes = params_buffer_bytes(params);
187 194
188 if (substream->stream == SNDRV_PCM_STR <<
189 kirkwood_dma_conf_mbus_windows <<
190 KIRKWOOD_PLAYBACK_WIN, <<
191 else <<
192 kirkwood_dma_conf_mbus_windows <<
193 KIRKWOOD_RECORD_WIN, a <<
194 return 0; 195 return 0;
195 } 196 }
196 197
197 static int kirkwood_dma_prepare(struct snd_soc !! 198 static int kirkwood_dma_hw_free(struct snd_pcm_substream *substream)
198 struct snd_pcm !! 199 {
>> 200 snd_pcm_set_runtime_buffer(substream, NULL);
>> 201 return 0;
>> 202 }
>> 203
>> 204 static int kirkwood_dma_prepare(struct snd_pcm_substream *substream)
199 { 205 {
200 struct snd_pcm_runtime *runtime = subs 206 struct snd_pcm_runtime *runtime = substream->runtime;
201 struct kirkwood_dma_data *priv = kirkw 207 struct kirkwood_dma_data *priv = kirkwood_priv(substream);
202 unsigned long size, count; 208 unsigned long size, count;
203 209
204 /* compute buffer size in term of "wor 210 /* compute buffer size in term of "words" as requested in specs */
205 size = frames_to_bytes(runtime, runtim 211 size = frames_to_bytes(runtime, runtime->buffer_size);
206 size = (size>>2)-1; 212 size = (size>>2)-1;
207 count = snd_pcm_lib_period_bytes(subst 213 count = snd_pcm_lib_period_bytes(substream);
208 214
209 if (substream->stream == SNDRV_PCM_STR 215 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {
210 writel(count, priv->io + KIRKW 216 writel(count, priv->io + KIRKWOOD_PLAY_BYTE_INT_COUNT);
211 writel(runtime->dma_addr, priv 217 writel(runtime->dma_addr, priv->io + KIRKWOOD_PLAY_BUF_ADDR);
212 writel(size, priv->io + KIRKWO 218 writel(size, priv->io + KIRKWOOD_PLAY_BUF_SIZE);
213 } else { 219 } else {
214 writel(count, priv->io + KIRKW 220 writel(count, priv->io + KIRKWOOD_REC_BYTE_INT_COUNT);
215 writel(runtime->dma_addr, priv 221 writel(runtime->dma_addr, priv->io + KIRKWOOD_REC_BUF_ADDR);
216 writel(size, priv->io + KIRKWO 222 writel(size, priv->io + KIRKWOOD_REC_BUF_SIZE);
217 } 223 }
218 224
219 225
220 return 0; 226 return 0;
221 } 227 }
222 228
223 static snd_pcm_uframes_t kirkwood_dma_pointer( !! 229 static snd_pcm_uframes_t kirkwood_dma_pointer(struct snd_pcm_substream
224 struct snd_soc_component *component, !! 230 *substream)
225 struct snd_pcm_substream *substream) <<
226 { 231 {
227 struct kirkwood_dma_data *priv = kirkw 232 struct kirkwood_dma_data *priv = kirkwood_priv(substream);
228 snd_pcm_uframes_t count; 233 snd_pcm_uframes_t count;
229 234
230 if (substream->stream == SNDRV_PCM_STR 235 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
231 count = bytes_to_frames(substr 236 count = bytes_to_frames(substream->runtime,
232 readl(priv->io + KIRKW 237 readl(priv->io + KIRKWOOD_PLAY_BYTE_COUNT));
233 else 238 else
234 count = bytes_to_frames(substr 239 count = bytes_to_frames(substream->runtime,
235 readl(priv->io + KIRKW 240 readl(priv->io + KIRKWOOD_REC_BYTE_COUNT));
236 241
237 return count; 242 return count;
238 } 243 }
239 244
240 static int kirkwood_dma_new(struct snd_soc_com !! 245 static const struct snd_pcm_ops kirkwood_dma_ops = {
241 struct snd_soc_pcm !! 246 .open = kirkwood_dma_open,
>> 247 .close = kirkwood_dma_close,
>> 248 .ioctl = snd_pcm_lib_ioctl,
>> 249 .hw_params = kirkwood_dma_hw_params,
>> 250 .hw_free = kirkwood_dma_hw_free,
>> 251 .prepare = kirkwood_dma_prepare,
>> 252 .pointer = kirkwood_dma_pointer,
>> 253 };
>> 254
>> 255 static int kirkwood_dma_preallocate_dma_buffer(struct snd_pcm *pcm,
>> 256 int stream)
242 { 257 {
>> 258 struct snd_pcm_substream *substream = pcm->streams[stream].substream;
>> 259 struct snd_dma_buffer *buf = &substream->dma_buffer;
243 size_t size = kirkwood_dma_snd_hw.buff 260 size_t size = kirkwood_dma_snd_hw.buffer_bytes_max;
>> 261
>> 262 buf->dev.type = SNDRV_DMA_TYPE_DEV;
>> 263 buf->dev.dev = pcm->card->dev;
>> 264 buf->area = dma_alloc_coherent(pcm->card->dev, size,
>> 265 &buf->addr, GFP_KERNEL);
>> 266 if (!buf->area)
>> 267 return -ENOMEM;
>> 268 buf->bytes = size;
>> 269 buf->private_data = NULL;
>> 270
>> 271 return 0;
>> 272 }
>> 273
>> 274 static int kirkwood_dma_new(struct snd_soc_pcm_runtime *rtd)
>> 275 {
244 struct snd_card *card = rtd->card->snd 276 struct snd_card *card = rtd->card->snd_card;
>> 277 struct snd_pcm *pcm = rtd->pcm;
245 int ret; 278 int ret;
246 279
247 ret = dma_coerce_mask_and_coherent(car 280 ret = dma_coerce_mask_and_coherent(card->dev, DMA_BIT_MASK(32));
248 if (ret) 281 if (ret)
249 return ret; 282 return ret;
250 283
251 snd_pcm_set_managed_buffer_all(rtd->pc !! 284 if (pcm->streams[SNDRV_PCM_STREAM_PLAYBACK].substream) {
252 card->d !! 285 ret = kirkwood_dma_preallocate_dma_buffer(pcm,
>> 286 SNDRV_PCM_STREAM_PLAYBACK);
>> 287 if (ret)
>> 288 return ret;
>> 289 }
>> 290
>> 291 if (pcm->streams[SNDRV_PCM_STREAM_CAPTURE].substream) {
>> 292 ret = kirkwood_dma_preallocate_dma_buffer(pcm,
>> 293 SNDRV_PCM_STREAM_CAPTURE);
>> 294 if (ret)
>> 295 return ret;
>> 296 }
253 297
254 return 0; 298 return 0;
255 } 299 }
256 300
257 const struct snd_soc_component_driver kirkwood !! 301 static void kirkwood_dma_free_dma_buffers(struct snd_pcm *pcm)
258 .name = DRV_NAME, !! 302 {
259 .open = kirkwood_dma_open, !! 303 struct snd_pcm_substream *substream;
260 .close = kirkwood_dma_close, !! 304 struct snd_dma_buffer *buf;
261 .hw_params = kirkwood_dma_hw_para !! 305 int stream;
262 .prepare = kirkwood_dma_prepare !! 306
263 .pointer = kirkwood_dma_pointer !! 307 for (stream = 0; stream < 2; stream++) {
264 .pcm_construct = kirkwood_dma_new, !! 308 substream = pcm->streams[stream].substream;
>> 309 if (!substream)
>> 310 continue;
>> 311 buf = &substream->dma_buffer;
>> 312 if (!buf->area)
>> 313 continue;
>> 314
>> 315 dma_free_coherent(pcm->card->dev, buf->bytes,
>> 316 buf->area, buf->addr);
>> 317 buf->area = NULL;
>> 318 }
>> 319 }
>> 320
>> 321 const struct snd_soc_platform_driver kirkwood_soc_platform = {
>> 322 .ops = &kirkwood_dma_ops,
>> 323 .pcm_new = kirkwood_dma_new,
>> 324 .pcm_free = kirkwood_dma_free_dma_buffers,
265 }; 325 };
266 326
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