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(asoc_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(priv->io + KIRKWOOD_INT_MASK); 47 status = readl(priv->io + KIRKWOOD_INT_CAUSE) & mask; 48 49 cause = readl(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(cause, 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(status, priv->io + KIRKWOOD_INT_CAUSE); 66 67 if (status & KIRKWOOD_INT_CAUSE_PLAY_BYTES) 68 snd_pcm_period_elapsed(priv->substream_play); 69 70 if (status & KIRKWOOD_INT_CAUSE_REC_BYTES) 71 snd_pcm_period_elapsed(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(0, base + KIRKWOOD_AUDIO_WIN_CTRL_REG(win)); 85 writel(0, 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(cs->base & 0xffff0000, 92 base + KIRKWOOD_AUDIO_WIN_BASE_REG(win)); 93 writel(((cs->size - 1) & 0xffff0000) | 94 (cs->mbus_attr << 8) | 95 (dram->mbus_dram_target_id << 4) | 1, 96 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(substream); 107 const struct mbus_dram_target_info *dram; 108 unsigned long addr; 109 110 snd_soc_set_runtime_hwparams(substream, &kirkwood_dma_snd_hw); 111 112 /* Ensure that all constraints linked to dma burst are fulfilled */ 113 err = snd_pcm_hw_constraint_minmax(runtime, 114 SNDRV_PCM_HW_PARAM_BUFFER_BYTES, 115 priv->burst * 2, 116 KIRKWOOD_AUDIO_BUF_MAX-1); 117 if (err < 0) 118 return err; 119 120 err = snd_pcm_hw_constraint_step(runtime, 0, 121 SNDRV_PCM_HW_PARAM_BUFFER_BYTES, 122 priv->burst); 123 if (err < 0) 124 return err; 125 126 err = snd_pcm_hw_constraint_step(substream->runtime, 0, 127 SNDRV_PCM_HW_PARAM_PERIOD_BYTES, 128 priv->burst); 129 if (err < 0) 130 return err; 131 132 if (!priv->substream_play && !priv->substream_rec) { 133 err = request_irq(priv->irq, kirkwood_dma_irq, IRQF_SHARED, 134 "kirkwood-i2s", priv); 135 if (err) 136 return err; 137 138 /* 139 * Enable Error interrupts. We're only ack'ing them but 140 * it's useful for diagnostics 141 */ 142 writel((unsigned int)-1, priv->io + KIRKWOOD_ERR_MASK); 143 } 144 145 dram = mv_mbus_dram_info(); 146 addr = substream->dma_buffer.addr; 147 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) { 148 if (priv->substream_play) 149 return -EBUSY; 150 priv->substream_play = substream; 151 kirkwood_dma_conf_mbus_windows(priv->io, 152 KIRKWOOD_PLAYBACK_WIN, addr, dram); 153 } else { 154 if (priv->substream_rec) 155 return -EBUSY; 156 priv->substream_rec = substream; 157 kirkwood_dma_conf_mbus_windows(priv->io, 158 KIRKWOOD_RECORD_WIN, addr, dram); 159 } 160 161 return 0; 162 } 163 164 static int kirkwood_dma_close(struct snd_soc_component *component, 165 struct snd_pcm_substream *substream) 166 { 167 struct kirkwood_dma_data *priv = kirkwood_priv(substream); 168 169 if (!priv) 170 return 0; 171 172 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) 173 priv->substream_play = NULL; 174 else 175 priv->substream_rec = NULL; 176 177 if (!priv->substream_play && !priv->substream_rec) { 178 writel(0, priv->io + KIRKWOOD_ERR_MASK); 179 free_irq(priv->irq, priv); 180 } 181 182 return 0; 183 } 184 185 static int kirkwood_dma_prepare(struct snd_soc_component *component, 186 struct snd_pcm_substream *substream) 187 { 188 struct snd_pcm_runtime *runtime = substream->runtime; 189 struct kirkwood_dma_data *priv = kirkwood_priv(substream); 190 unsigned long size, count; 191 192 /* compute buffer size in term of "words" as requested in specs */ 193 size = frames_to_bytes(runtime, runtime->buffer_size); 194 size = (size>>2)-1; 195 count = snd_pcm_lib_period_bytes(substream); 196 197 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) { 198 writel(count, priv->io + KIRKWOOD_PLAY_BYTE_INT_COUNT); 199 writel(runtime->dma_addr, priv->io + KIRKWOOD_PLAY_BUF_ADDR); 200 writel(size, priv->io + KIRKWOOD_PLAY_BUF_SIZE); 201 } else { 202 writel(count, priv->io + KIRKWOOD_REC_BYTE_INT_COUNT); 203 writel(runtime->dma_addr, priv->io + KIRKWOOD_REC_BUF_ADDR); 204 writel(size, priv->io + KIRKWOOD_REC_BUF_SIZE); 205 } 206 207 208 return 0; 209 } 210 211 static snd_pcm_uframes_t kirkwood_dma_pointer( 212 struct snd_soc_component *component, 213 struct snd_pcm_substream *substream) 214 { 215 struct kirkwood_dma_data *priv = kirkwood_priv(substream); 216 snd_pcm_uframes_t count; 217 218 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) 219 count = bytes_to_frames(substream->runtime, 220 readl(priv->io + KIRKWOOD_PLAY_BYTE_COUNT)); 221 else 222 count = bytes_to_frames(substream->runtime, 223 readl(priv->io + KIRKWOOD_REC_BYTE_COUNT)); 224 225 return count; 226 } 227 228 static int kirkwood_dma_new(struct snd_soc_component *component, 229 struct snd_soc_pcm_runtime *rtd) 230 { 231 size_t size = kirkwood_dma_snd_hw.buffer_bytes_max; 232 struct snd_card *card = rtd->card->snd_card; 233 int ret; 234 235 ret = dma_coerce_mask_and_coherent(card->dev, DMA_BIT_MASK(32)); 236 if (ret) 237 return ret; 238 239 snd_pcm_set_managed_buffer_all(rtd->pcm, SNDRV_DMA_TYPE_DEV, 240 card->dev, size, size); 241 242 return 0; 243 } 244 245 const struct snd_soc_component_driver kirkwood_soc_component = { 246 .name = DRV_NAME, 247 .open = kirkwood_dma_open, 248 .close = kirkwood_dma_close, 249 .prepare = kirkwood_dma_prepare, 250 .pointer = kirkwood_dma_pointer, 251 .pcm_construct = kirkwood_dma_new, 252 }; 253