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 20static 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 26static 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 41static 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 76static void 77kirkwood_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 101static 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); 107 108 snd_soc_set_runtime_hwparams(substream, &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 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, 0, 119 SNDRV_PCM_HW_PARAM_BUFFER_BYTES, 120 priv->burst); 121 if (err < 0) 122 return err; 123 124 err = snd_pcm_hw_constraint_step(substream->runtime, 0, 125 SNDRV_PCM_HW_PARAM_PERIOD_BYTES, 126 priv->burst); 127 if (err < 0) 128 return err; 129 130 if (!priv->substream_play && !priv->substream_rec) { 131 err = request_irq(priv->irq, kirkwood_dma_irq, IRQF_SHARED, 132 "kirkwood-i2s", 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((unsigned int)-1, 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 156static int kirkwood_dma_close(struct snd_soc_component *component, 157 struct snd_pcm_substream *substream) 158{ 159 struct kirkwood_dma_data *priv = kirkwood_priv(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(0, priv->io + KIRKWOOD_ERR_MASK); 171 free_irq(priv->irq, priv); 172 } 173 174 return 0; 175} 176 177static 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(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(priv->io, 187 KIRKWOOD_PLAYBACK_WIN, addr, dram); 188 else 189 kirkwood_dma_conf_mbus_windows(priv->io, 190 KIRKWOOD_RECORD_WIN, addr, dram); 191 return 0; 192} 193 194static 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(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, 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(count, priv->io + KIRKWOOD_PLAY_BYTE_INT_COUNT); 208 writel(runtime->dma_addr, priv->io + KIRKWOOD_PLAY_BUF_ADDR); 209 writel(size, priv->io + KIRKWOOD_PLAY_BUF_SIZE); 210 } else { 211 writel(count, priv->io + KIRKWOOD_REC_BYTE_INT_COUNT); 212 writel(runtime->dma_addr, priv->io + KIRKWOOD_REC_BUF_ADDR); 213 writel(size, priv->io + KIRKWOOD_REC_BUF_SIZE); 214 } 215 216 217 return 0; 218} 219 220static 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(substream); 225 snd_pcm_uframes_t count; 226 227 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) 228 count = bytes_to_frames(substream->runtime, 229 readl(priv->io + KIRKWOOD_PLAY_BYTE_COUNT)); 230 else 231 count = bytes_to_frames(substream->runtime, 232 readl(priv->io + KIRKWOOD_REC_BYTE_COUNT)); 233 234 return count; 235} 236 237static 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(card->dev, DMA_BIT_MASK(32)); 245 if (ret) 246 return ret; 247 248 snd_pcm_set_managed_buffer_all(rtd->pcm, SNDRV_DMA_TYPE_DEV, 249 card->dev, size, size); 250 251 return 0; 252} 253 254const 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