1 // SPDX-License-Identifier: GPL-2.0-or-later 1
2 /*
3 * kirkwood-dma.c
4 *
5 * (c) 2010 Arnaud Patard <apatard@mandriva.co
6 * (c) 2010 Arnaud Patard <arnaud.patard@rtp-n
7 */
8
9 #include <linux/init.h>
10 #include <linux/module.h>
11 #include <linux/device.h>
12 #include <linux/io.h>
13 #include <linux/slab.h>
14 #include <linux/interrupt.h>
15 #include <linux/dma-mapping.h>
16 #include <linux/mbus.h>
17 #include <sound/soc.h>
18 #include "kirkwood.h"
19
20 static struct kirkwood_dma_data *kirkwood_priv
21 {
22 struct snd_soc_pcm_runtime *soc_runtim
23 return snd_soc_dai_get_drvdata(snd_soc
24 }
25
26 static const struct snd_pcm_hardware kirkwood_
27 .info = SNDRV_PCM_INFO_INTERLEAVED |
28 SNDRV_PCM_INFO_MMAP |
29 SNDRV_PCM_INFO_MMAP_VALID |
30 SNDRV_PCM_INFO_BLOCK_TRANSFER
31 SNDRV_PCM_INFO_PAUSE |
32 SNDRV_PCM_INFO_NO_PERIOD_WAKEU
33 .buffer_bytes_max = KIRKWOOD_SND
34 .period_bytes_min = KIRKWOOD_SND
35 .period_bytes_max = KIRKWOOD_SND
36 .periods_min = KIRKWOOD_SND
37 .periods_max = KIRKWOOD_SND
38 .fifo_size = 0,
39 };
40
41 static irqreturn_t kirkwood_dma_irq(int irq, v
42 {
43 struct kirkwood_dma_data *priv = dev_i
44 unsigned long mask, status, cause;
45
46 mask = readl(priv->io + KIRKWOOD_INT_M
47 status = readl(priv->io + KIRKWOOD_INT
48
49 cause = readl(priv->io + KIRKWOOD_ERR_
50 if (unlikely(cause)) {
51 printk(KERN_WARNING "%s: got e
52 __func__, caus
53 writel(cause, priv->io + KIRKW
54 }
55
56 /* we've enabled only bytes interrupts
57 if (status & ~(KIRKWOOD_INT_CAUSE_PLAY
58 KIRKWOOD_INT_CAUSE_REC
59 printk(KERN_WARNING "%s: unexp
60 __func__, status);
61 return IRQ_NONE;
62 }
63
64 /* ack int */
65 writel(status, priv->io + KIRKWOOD_INT
66
67 if (status & KIRKWOOD_INT_CAUSE_PLAY_B
68 snd_pcm_period_elapsed(priv->s
69
70 if (status & KIRKWOOD_INT_CAUSE_REC_BY
71 snd_pcm_period_elapsed(priv->s
72
73 return IRQ_HANDLED;
74 }
75
76 static void
77 kirkwood_dma_conf_mbus_windows(void __iomem *b
78 unsigned long d
79 const struct mb
80 {
81 int i;
82
83 /* First disable and clear windows */
84 writel(0, base + KIRKWOOD_AUDIO_WIN_CT
85 writel(0, base + KIRKWOOD_AUDIO_WIN_BA
86
87 /* try to find matching cs for current
88 for (i = 0; i < dram->num_cs; i++) {
89 const struct mbus_dram_window
90 if ((cs->base & 0xffff0000) <
91 writel(cs->base & 0xff
92 base + KIRKWOO
93 writel(((cs->size - 1)
94 (cs->mbus_attr
95 (dram->mbus_dr
96 base + KIRKWOO
97 }
98 }
99 }
100
101 static int kirkwood_dma_open(struct snd_soc_co
102 struct snd_pcm_su
103 {
104 int err;
105 struct snd_pcm_runtime *runtime = subs
106 struct kirkwood_dma_data *priv = kirkw
107
108 snd_soc_set_runtime_hwparams(substream
109
110 /* Ensure that all constraints linked
111 err = snd_pcm_hw_constraint_minmax(run
112 SNDRV_PCM_HW_PARAM_BUF
113 priv->burst * 2,
114 KIRKWOOD_AUDIO_BUF_MAX
115 if (err < 0)
116 return err;
117
118 err = snd_pcm_hw_constraint_step(runti
119 SNDRV_PCM_HW_PARAM_BUF
120 priv->burst);
121 if (err < 0)
122 return err;
123
124 err = snd_pcm_hw_constraint_step(subst
125 SNDRV_PCM_HW_PARAM_PE
126 priv->burst);
127 if (err < 0)
128 return err;
129
130 if (!priv->substream_play && !priv->su
131 err = request_irq(priv->irq, k
132 "kirkwood-i2
133 if (err)
134 return err;
135
136 /*
137 * Enable Error interrupts. We
138 * it's useful for diagnostics
139 */
140 writel((unsigned int)-1, priv-
141 }
142
143 if (substream->stream == SNDRV_PCM_STR
144 if (priv->substream_play)
145 return -EBUSY;
146 priv->substream_play = substre
147 } else {
148 if (priv->substream_rec)
149 return -EBUSY;
150 priv->substream_rec = substrea
151 }
152
153 return 0;
154 }
155
156 static int kirkwood_dma_close(struct snd_soc_c
157 struct snd_pcm_s
158 {
159 struct kirkwood_dma_data *priv = kirkw
160
161 if (!priv)
162 return 0;
163
164 if (substream->stream == SNDRV_PCM_STR
165 priv->substream_play = NULL;
166 else
167 priv->substream_rec = NULL;
168
169 if (!priv->substream_play && !priv->su
170 writel(0, priv->io + KIRKWOOD_
171 free_irq(priv->irq, priv);
172 }
173
174 return 0;
175 }
176
177 static int kirkwood_dma_hw_params(struct snd_s
178 struct snd_p
179 struct snd_p
180 {
181 struct kirkwood_dma_data *priv = kirkw
182 const struct mbus_dram_target_info *dr
183 unsigned long addr = substream->runtim
184
185 if (!dram)
186 return 0;
187
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 }
196
197 static int kirkwood_dma_prepare(struct snd_soc
198 struct snd_pcm
199 {
200 struct snd_pcm_runtime *runtime = subs
201 struct kirkwood_dma_data *priv = kirkw
202 unsigned long size, count;
203
204 /* compute buffer size in term of "wor
205 size = frames_to_bytes(runtime, runtim
206 size = (size>>2)-1;
207 count = snd_pcm_lib_period_bytes(subst
208
209 if (substream->stream == SNDRV_PCM_STR
210 writel(count, priv->io + KIRKW
211 writel(runtime->dma_addr, priv
212 writel(size, priv->io + KIRKWO
213 } else {
214 writel(count, priv->io + KIRKW
215 writel(runtime->dma_addr, priv
216 writel(size, priv->io + KIRKWO
217 }
218
219
220 return 0;
221 }
222
223 static snd_pcm_uframes_t kirkwood_dma_pointer(
224 struct snd_soc_component *component,
225 struct snd_pcm_substream *substream)
226 {
227 struct kirkwood_dma_data *priv = kirkw
228 snd_pcm_uframes_t count;
229
230 if (substream->stream == SNDRV_PCM_STR
231 count = bytes_to_frames(substr
232 readl(priv->io + KIRKW
233 else
234 count = bytes_to_frames(substr
235 readl(priv->io + KIRKW
236
237 return count;
238 }
239
240 static int kirkwood_dma_new(struct snd_soc_com
241 struct snd_soc_pcm
242 {
243 size_t size = kirkwood_dma_snd_hw.buff
244 struct snd_card *card = rtd->card->snd
245 int ret;
246
247 ret = dma_coerce_mask_and_coherent(car
248 if (ret)
249 return ret;
250
251 snd_pcm_set_managed_buffer_all(rtd->pc
252 card->d
253
254 return 0;
255 }
256
257 const struct snd_soc_component_driver kirkwood
258 .name = DRV_NAME,
259 .open = kirkwood_dma_open,
260 .close = kirkwood_dma_close,
261 .hw_params = kirkwood_dma_hw_para
262 .prepare = kirkwood_dma_prepare
263 .pointer = kirkwood_dma_pointer
264 .pcm_construct = kirkwood_dma_new,
265 };
266
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