1 | // SPDX-License-Identifier: GPL-2.0-or-later |
2 | /* |
3 | * kirkwood-dma.c |
4 | * |
5 | * (c) 2010 Arnaud Patard <apatard@mandriva.com> |
6 | * (c) 2010 Arnaud Patard <arnaud.patard@rtp-net.org> |
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(struct snd_pcm_substream *subs) |
21 | { |
22 | struct snd_soc_pcm_runtime *soc_runtime = subs->private_data; |
23 | return snd_soc_dai_get_drvdata(snd_soc_rtd_to_cpu(soc_runtime, 0)); |
24 | } |
25 | |
26 | static const struct snd_pcm_hardware kirkwood_dma_snd_hw = { |
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_WAKEUP, |
33 | .buffer_bytes_max = KIRKWOOD_SND_MAX_BUFFER_BYTES, |
34 | .period_bytes_min = KIRKWOOD_SND_MIN_PERIOD_BYTES, |
35 | .period_bytes_max = KIRKWOOD_SND_MAX_PERIOD_BYTES, |
36 | .periods_min = KIRKWOOD_SND_MIN_PERIODS, |
37 | .periods_max = KIRKWOOD_SND_MAX_PERIODS, |
38 | .fifo_size = 0, |
39 | }; |
40 | |
41 | static irqreturn_t kirkwood_dma_irq(int irq, void *dev_id) |
42 | { |
43 | struct kirkwood_dma_data *priv = dev_id; |
44 | unsigned long mask, status, cause; |
45 | |
46 | mask = readl(addr: priv->io + KIRKWOOD_INT_MASK); |
47 | status = readl(addr: priv->io + KIRKWOOD_INT_CAUSE) & mask; |
48 | |
49 | cause = readl(addr: priv->io + KIRKWOOD_ERR_CAUSE); |
50 | if (unlikely(cause)) { |
51 | printk(KERN_WARNING "%s: got err interrupt 0x%lx\n" , |
52 | __func__, cause); |
53 | writel(val: cause, addr: priv->io + KIRKWOOD_ERR_CAUSE); |
54 | } |
55 | |
56 | /* we've enabled only bytes interrupts ... */ |
57 | if (status & ~(KIRKWOOD_INT_CAUSE_PLAY_BYTES | \ |
58 | KIRKWOOD_INT_CAUSE_REC_BYTES)) { |
59 | printk(KERN_WARNING "%s: unexpected interrupt %lx\n" , |
60 | __func__, status); |
61 | return IRQ_NONE; |
62 | } |
63 | |
64 | /* ack int */ |
65 | writel(val: status, addr: priv->io + KIRKWOOD_INT_CAUSE); |
66 | |
67 | if (status & KIRKWOOD_INT_CAUSE_PLAY_BYTES) |
68 | snd_pcm_period_elapsed(substream: priv->substream_play); |
69 | |
70 | if (status & KIRKWOOD_INT_CAUSE_REC_BYTES) |
71 | snd_pcm_period_elapsed(substream: priv->substream_rec); |
72 | |
73 | return IRQ_HANDLED; |
74 | } |
75 | |
76 | static void |
77 | kirkwood_dma_conf_mbus_windows(void __iomem *base, int win, |
78 | unsigned long dma, |
79 | const struct mbus_dram_target_info *dram) |
80 | { |
81 | int i; |
82 | |
83 | /* First disable and clear windows */ |
84 | writel(val: 0, addr: base + KIRKWOOD_AUDIO_WIN_CTRL_REG(win)); |
85 | writel(val: 0, addr: base + KIRKWOOD_AUDIO_WIN_BASE_REG(win)); |
86 | |
87 | /* try to find matching cs for current dma address */ |
88 | for (i = 0; i < dram->num_cs; i++) { |
89 | const struct mbus_dram_window *cs = &dram->cs[i]; |
90 | if ((cs->base & 0xffff0000) < (dma & 0xffff0000)) { |
91 | writel(val: cs->base & 0xffff0000, |
92 | addr: base + KIRKWOOD_AUDIO_WIN_BASE_REG(win)); |
93 | writel(val: ((cs->size - 1) & 0xffff0000) | |
94 | (cs->mbus_attr << 8) | |
95 | (dram->mbus_dram_target_id << 4) | 1, |
96 | addr: base + KIRKWOOD_AUDIO_WIN_CTRL_REG(win)); |
97 | } |
98 | } |
99 | } |
100 | |
101 | static int kirkwood_dma_open(struct snd_soc_component *component, |
102 | struct snd_pcm_substream *substream) |
103 | { |
104 | int err; |
105 | struct snd_pcm_runtime *runtime = substream->runtime; |
106 | struct kirkwood_dma_data *priv = kirkwood_priv(subs: substream); |
107 | |
108 | snd_soc_set_runtime_hwparams(substream, hw: &kirkwood_dma_snd_hw); |
109 | |
110 | /* Ensure that all constraints linked to dma burst are fulfilled */ |
111 | err = snd_pcm_hw_constraint_minmax(runtime, |
112 | SNDRV_PCM_HW_PARAM_BUFFER_BYTES, |
113 | min: priv->burst * 2, |
114 | KIRKWOOD_AUDIO_BUF_MAX-1); |
115 | if (err < 0) |
116 | return err; |
117 | |
118 | err = snd_pcm_hw_constraint_step(runtime, cond: 0, |
119 | SNDRV_PCM_HW_PARAM_BUFFER_BYTES, |
120 | step: priv->burst); |
121 | if (err < 0) |
122 | return err; |
123 | |
124 | err = snd_pcm_hw_constraint_step(runtime: substream->runtime, cond: 0, |
125 | SNDRV_PCM_HW_PARAM_PERIOD_BYTES, |
126 | step: priv->burst); |
127 | if (err < 0) |
128 | return err; |
129 | |
130 | if (!priv->substream_play && !priv->substream_rec) { |
131 | err = request_irq(irq: priv->irq, handler: kirkwood_dma_irq, IRQF_SHARED, |
132 | name: "kirkwood-i2s" , dev: priv); |
133 | if (err) |
134 | return err; |
135 | |
136 | /* |
137 | * Enable Error interrupts. We're only ack'ing them but |
138 | * it's useful for diagnostics |
139 | */ |
140 | writel(val: (unsigned int)-1, addr: priv->io + KIRKWOOD_ERR_MASK); |
141 | } |
142 | |
143 | if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) { |
144 | if (priv->substream_play) |
145 | return -EBUSY; |
146 | priv->substream_play = substream; |
147 | } else { |
148 | if (priv->substream_rec) |
149 | return -EBUSY; |
150 | priv->substream_rec = substream; |
151 | } |
152 | |
153 | return 0; |
154 | } |
155 | |
156 | static int kirkwood_dma_close(struct snd_soc_component *component, |
157 | struct snd_pcm_substream *substream) |
158 | { |
159 | struct kirkwood_dma_data *priv = kirkwood_priv(subs: substream); |
160 | |
161 | if (!priv) |
162 | return 0; |
163 | |
164 | if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) |
165 | priv->substream_play = NULL; |
166 | else |
167 | priv->substream_rec = NULL; |
168 | |
169 | if (!priv->substream_play && !priv->substream_rec) { |
170 | writel(val: 0, addr: priv->io + KIRKWOOD_ERR_MASK); |
171 | free_irq(priv->irq, priv); |
172 | } |
173 | |
174 | return 0; |
175 | } |
176 | |
177 | static int kirkwood_dma_hw_params(struct snd_soc_component *component, |
178 | struct snd_pcm_substream *substream, |
179 | struct snd_pcm_hw_params *params) |
180 | { |
181 | struct kirkwood_dma_data *priv = kirkwood_priv(subs: substream); |
182 | const struct mbus_dram_target_info *dram = mv_mbus_dram_info(); |
183 | unsigned long addr = substream->runtime->dma_addr; |
184 | |
185 | if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) |
186 | kirkwood_dma_conf_mbus_windows(base: priv->io, |
187 | KIRKWOOD_PLAYBACK_WIN, dma: addr, dram); |
188 | else |
189 | kirkwood_dma_conf_mbus_windows(base: priv->io, |
190 | KIRKWOOD_RECORD_WIN, dma: addr, dram); |
191 | return 0; |
192 | } |
193 | |
194 | static int kirkwood_dma_prepare(struct snd_soc_component *component, |
195 | struct snd_pcm_substream *substream) |
196 | { |
197 | struct snd_pcm_runtime *runtime = substream->runtime; |
198 | struct kirkwood_dma_data *priv = kirkwood_priv(subs: substream); |
199 | unsigned long size, count; |
200 | |
201 | /* compute buffer size in term of "words" as requested in specs */ |
202 | size = frames_to_bytes(runtime, size: runtime->buffer_size); |
203 | size = (size>>2)-1; |
204 | count = snd_pcm_lib_period_bytes(substream); |
205 | |
206 | if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) { |
207 | writel(val: count, addr: priv->io + KIRKWOOD_PLAY_BYTE_INT_COUNT); |
208 | writel(val: runtime->dma_addr, addr: priv->io + KIRKWOOD_PLAY_BUF_ADDR); |
209 | writel(val: size, addr: priv->io + KIRKWOOD_PLAY_BUF_SIZE); |
210 | } else { |
211 | writel(val: count, addr: priv->io + KIRKWOOD_REC_BYTE_INT_COUNT); |
212 | writel(val: runtime->dma_addr, addr: priv->io + KIRKWOOD_REC_BUF_ADDR); |
213 | writel(val: size, addr: priv->io + KIRKWOOD_REC_BUF_SIZE); |
214 | } |
215 | |
216 | |
217 | return 0; |
218 | } |
219 | |
220 | static snd_pcm_uframes_t kirkwood_dma_pointer( |
221 | struct snd_soc_component *component, |
222 | struct snd_pcm_substream *substream) |
223 | { |
224 | struct kirkwood_dma_data *priv = kirkwood_priv(subs: substream); |
225 | snd_pcm_uframes_t count; |
226 | |
227 | if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) |
228 | count = bytes_to_frames(runtime: substream->runtime, |
229 | readl(addr: priv->io + KIRKWOOD_PLAY_BYTE_COUNT)); |
230 | else |
231 | count = bytes_to_frames(runtime: substream->runtime, |
232 | readl(addr: priv->io + KIRKWOOD_REC_BYTE_COUNT)); |
233 | |
234 | return count; |
235 | } |
236 | |
237 | static int kirkwood_dma_new(struct snd_soc_component *component, |
238 | struct snd_soc_pcm_runtime *rtd) |
239 | { |
240 | size_t size = kirkwood_dma_snd_hw.buffer_bytes_max; |
241 | struct snd_card *card = rtd->card->snd_card; |
242 | int ret; |
243 | |
244 | ret = dma_coerce_mask_and_coherent(dev: card->dev, DMA_BIT_MASK(32)); |
245 | if (ret) |
246 | return ret; |
247 | |
248 | snd_pcm_set_managed_buffer_all(pcm: rtd->pcm, SNDRV_DMA_TYPE_DEV, |
249 | data: card->dev, size, max: size); |
250 | |
251 | return 0; |
252 | } |
253 | |
254 | const struct snd_soc_component_driver kirkwood_soc_component = { |
255 | .name = DRV_NAME, |
256 | .open = kirkwood_dma_open, |
257 | .close = kirkwood_dma_close, |
258 | .hw_params = kirkwood_dma_hw_params, |
259 | .prepare = kirkwood_dma_prepare, |
260 | .pointer = kirkwood_dma_pointer, |
261 | .pcm_construct = kirkwood_dma_new, |
262 | }; |
263 | |