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1// SPDX-License-Identifier: GPL-2.0+2//3// idma.c - I2S0 internal DMA driver4//5// Copyright (c) 2011 Samsung Electronics Co., Ltd.6// http://www.samsung.com7 8#include <linux/interrupt.h>9#include <linux/platform_device.h>10#include <linux/dma-mapping.h>11#include <linux/slab.h>12#include <linux/module.h>13#include <sound/pcm.h>14#include <sound/pcm_params.h>15#include <sound/soc.h>16 17#include "i2s.h"18#include "idma.h"19#include "i2s-regs.h"20 21#define ST_RUNNING (1<<0)22#define ST_OPENED (1<<1)23 24static const struct snd_pcm_hardware idma_hardware = {25 .info = SNDRV_PCM_INFO_INTERLEAVED |26 SNDRV_PCM_INFO_BLOCK_TRANSFER |27 SNDRV_PCM_INFO_MMAP |28 SNDRV_PCM_INFO_MMAP_VALID |29 SNDRV_PCM_INFO_PAUSE |30 SNDRV_PCM_INFO_RESUME,31 .buffer_bytes_max = MAX_IDMA_BUFFER,32 .period_bytes_min = 128,33 .period_bytes_max = MAX_IDMA_PERIOD,34 .periods_min = 1,35 .periods_max = 2,36};37 38struct idma_ctrl {39 spinlock_t lock;40 int state;41 dma_addr_t start;42 dma_addr_t pos;43 dma_addr_t end;44 dma_addr_t period;45 dma_addr_t periodsz;46 void *token;47 void (*cb)(void *dt, int bytes_xfer);48};49 50static struct idma_info {51 spinlock_t lock;52 void __iomem *regs;53 dma_addr_t lp_tx_addr;54} idma;55 56static int idma_irq;57 58static void idma_getpos(dma_addr_t *src)59{60 *src = idma.lp_tx_addr +61 (readl(idma.regs + I2STRNCNT) & 0xffffff) * 4;62}63 64static int idma_enqueue(struct snd_pcm_substream *substream)65{66 struct snd_pcm_runtime *runtime = substream->runtime;67 struct idma_ctrl *prtd = substream->runtime->private_data;68 u32 val;69 70 spin_lock(&prtd->lock);71 prtd->token = (void *) substream;72 spin_unlock(&prtd->lock);73 74 /* Internal DMA Level0 Interrupt Address */75 val = idma.lp_tx_addr + prtd->periodsz;76 writel(val, idma.regs + I2SLVL0ADDR);77 78 /* Start address0 of I2S internal DMA operation. */79 val = idma.lp_tx_addr;80 writel(val, idma.regs + I2SSTR0);81 82 /*83 * Transfer block size for I2S internal DMA.84 * Should decide transfer size before start dma operation85 */86 val = readl(idma.regs + I2SSIZE);87 val &= ~(I2SSIZE_TRNMSK << I2SSIZE_SHIFT);88 val |= (((runtime->dma_bytes >> 2) &89 I2SSIZE_TRNMSK) << I2SSIZE_SHIFT);90 writel(val, idma.regs + I2SSIZE);91 92 val = readl(idma.regs + I2SAHB);93 val |= AHB_INTENLVL0;94 writel(val, idma.regs + I2SAHB);95 96 return 0;97}98 99static void idma_setcallbk(struct snd_pcm_substream *substream,100 void (*cb)(void *, int))101{102 struct idma_ctrl *prtd = substream->runtime->private_data;103 104 spin_lock(&prtd->lock);105 prtd->cb = cb;106 spin_unlock(&prtd->lock);107}108 109static void idma_control(int op)110{111 u32 val = readl(idma.regs + I2SAHB);112 113 spin_lock(&idma.lock);114 115 switch (op) {116 case LPAM_DMA_START:117 val |= (AHB_INTENLVL0 | AHB_DMAEN);118 break;119 case LPAM_DMA_STOP:120 val &= ~(AHB_INTENLVL0 | AHB_DMAEN);121 break;122 default:123 spin_unlock(&idma.lock);124 return;125 }126 127 writel(val, idma.regs + I2SAHB);128 spin_unlock(&idma.lock);129}130 131static void idma_done(void *id, int bytes_xfer)132{133 struct snd_pcm_substream *substream = id;134 struct idma_ctrl *prtd = substream->runtime->private_data;135 136 if (prtd && (prtd->state & ST_RUNNING))137 snd_pcm_period_elapsed(substream);138}139 140static int idma_hw_params(struct snd_soc_component *component,141 struct snd_pcm_substream *substream,142 struct snd_pcm_hw_params *params)143{144 struct snd_pcm_runtime *runtime = substream->runtime;145 struct idma_ctrl *prtd = substream->runtime->private_data;146 u32 mod = readl(idma.regs + I2SMOD);147 u32 ahb = readl(idma.regs + I2SAHB);148 149 ahb |= (AHB_DMARLD | AHB_INTMASK);150 mod |= MOD_TXS_IDMA;151 writel(ahb, idma.regs + I2SAHB);152 writel(mod, idma.regs + I2SMOD);153 154 snd_pcm_set_runtime_buffer(substream, &substream->dma_buffer);155 runtime->dma_bytes = params_buffer_bytes(params);156 157 prtd->start = prtd->pos = runtime->dma_addr;158 prtd->period = params_periods(params);159 prtd->periodsz = params_period_bytes(params);160 prtd->end = runtime->dma_addr + runtime->dma_bytes;161 162 idma_setcallbk(substream, idma_done);163 164 return 0;165}166 167static int idma_hw_free(struct snd_soc_component *component,168 struct snd_pcm_substream *substream)169{170 snd_pcm_set_runtime_buffer(substream, NULL);171 172 return 0;173}174 175static int idma_prepare(struct snd_soc_component *component,176 struct snd_pcm_substream *substream)177{178 struct idma_ctrl *prtd = substream->runtime->private_data;179 180 prtd->pos = prtd->start;181 182 /* flush the DMA channel */183 idma_control(LPAM_DMA_STOP);184 idma_enqueue(substream);185 186 return 0;187}188 189static int idma_trigger(struct snd_soc_component *component,190 struct snd_pcm_substream *substream, int cmd)191{192 struct idma_ctrl *prtd = substream->runtime->private_data;193 int ret = 0;194 195 spin_lock(&prtd->lock);196 197 switch (cmd) {198 case SNDRV_PCM_TRIGGER_RESUME:199 case SNDRV_PCM_TRIGGER_START:200 case SNDRV_PCM_TRIGGER_PAUSE_RELEASE:201 prtd->state |= ST_RUNNING;202 idma_control(LPAM_DMA_START);203 break;204 205 case SNDRV_PCM_TRIGGER_SUSPEND:206 case SNDRV_PCM_TRIGGER_STOP:207 case SNDRV_PCM_TRIGGER_PAUSE_PUSH:208 prtd->state &= ~ST_RUNNING;209 idma_control(LPAM_DMA_STOP);210 break;211 212 default:213 ret = -EINVAL;214 break;215 }216 217 spin_unlock(&prtd->lock);218 219 return ret;220}221 222static snd_pcm_uframes_t223idma_pointer(struct snd_soc_component *component,224 struct snd_pcm_substream *substream)225{226 struct snd_pcm_runtime *runtime = substream->runtime;227 struct idma_ctrl *prtd = runtime->private_data;228 dma_addr_t src;229 unsigned long res;230 231 spin_lock(&prtd->lock);232 233 idma_getpos(&src);234 res = src - prtd->start;235 236 spin_unlock(&prtd->lock);237 238 return bytes_to_frames(substream->runtime, res);239}240 241static int idma_mmap(struct snd_soc_component *component,242 struct snd_pcm_substream *substream,243 struct vm_area_struct *vma)244{245 struct snd_pcm_runtime *runtime = substream->runtime;246 unsigned long size, offset;247 248 /* From snd_pcm_lib_mmap_iomem */249 vma->vm_page_prot = pgprot_noncached(vma->vm_page_prot);250 size = vma->vm_end - vma->vm_start;251 offset = vma->vm_pgoff << PAGE_SHIFT;252 return io_remap_pfn_range(vma, vma->vm_start,253 (runtime->dma_addr + offset) >> PAGE_SHIFT,254 size, vma->vm_page_prot);255}256 257static irqreturn_t iis_irq(int irqno, void *dev_id)258{259 struct idma_ctrl *prtd = (struct idma_ctrl *)dev_id;260 u32 iisahb, val, addr;261 262 iisahb = readl(idma.regs + I2SAHB);263 264 val = (iisahb & AHB_LVL0INT) ? AHB_CLRLVL0INT : 0;265 266 if (val) {267 iisahb |= val;268 writel(iisahb, idma.regs + I2SAHB);269 270 addr = readl(idma.regs + I2SLVL0ADDR) - idma.lp_tx_addr;271 addr += prtd->periodsz;272 addr %= (u32)(prtd->end - prtd->start);273 addr += idma.lp_tx_addr;274 275 writel(addr, idma.regs + I2SLVL0ADDR);276 277 if (prtd->cb)278 prtd->cb(prtd->token, prtd->period);279 }280 281 return IRQ_HANDLED;282}283 284static int idma_open(struct snd_soc_component *component,285 struct snd_pcm_substream *substream)286{287 struct snd_pcm_runtime *runtime = substream->runtime;288 struct idma_ctrl *prtd;289 int ret;290 291 snd_soc_set_runtime_hwparams(substream, &idma_hardware);292 293 prtd = kzalloc(sizeof(struct idma_ctrl), GFP_KERNEL);294 if (prtd == NULL)295 return -ENOMEM;296 297 ret = request_irq(idma_irq, iis_irq, 0, "i2s", prtd);298 if (ret < 0) {299 pr_err("fail to claim i2s irq , ret = %d\n", ret);300 kfree(prtd);301 return ret;302 }303 304 spin_lock_init(&prtd->lock);305 306 runtime->private_data = prtd;307 308 return 0;309}310 311static int idma_close(struct snd_soc_component *component,312 struct snd_pcm_substream *substream)313{314 struct snd_pcm_runtime *runtime = substream->runtime;315 struct idma_ctrl *prtd = runtime->private_data;316 317 free_irq(idma_irq, prtd);318 319 if (!prtd)320 pr_err("idma_close called with prtd == NULL\n");321 322 kfree(prtd);323 324 return 0;325}326 327static void idma_free(struct snd_soc_component *component,328 struct snd_pcm *pcm)329{330 struct snd_pcm_substream *substream;331 struct snd_dma_buffer *buf;332 333 substream = pcm->streams[SNDRV_PCM_STREAM_PLAYBACK].substream;334 if (!substream)335 return;336 337 buf = &substream->dma_buffer;338 if (!buf->area)339 return;340 341 iounmap((void __iomem *)buf->area);342 343 buf->area = NULL;344 buf->addr = 0;345}346 347static int preallocate_idma_buffer(struct snd_pcm *pcm, int stream)348{349 struct snd_pcm_substream *substream = pcm->streams[stream].substream;350 struct snd_dma_buffer *buf = &substream->dma_buffer;351 352 buf->dev.dev = pcm->card->dev;353 buf->private_data = NULL;354 355 /* Assign PCM buffer pointers */356 buf->dev.type = SNDRV_DMA_TYPE_CONTINUOUS;357 buf->addr = idma.lp_tx_addr;358 buf->bytes = idma_hardware.buffer_bytes_max;359 buf->area = (unsigned char * __force)ioremap(buf->addr, buf->bytes);360 if (!buf->area)361 return -ENOMEM;362 363 return 0;364}365 366static int idma_new(struct snd_soc_component *component,367 struct snd_soc_pcm_runtime *rtd)368{369 struct snd_card *card = rtd->card->snd_card;370 struct snd_pcm *pcm = rtd->pcm;371 int ret;372 373 ret = dma_coerce_mask_and_coherent(card->dev, DMA_BIT_MASK(32));374 if (ret)375 return ret;376 377 if (pcm->streams[SNDRV_PCM_STREAM_PLAYBACK].substream) {378 ret = preallocate_idma_buffer(pcm,379 SNDRV_PCM_STREAM_PLAYBACK);380 }381 382 return ret;383}384 385void idma_reg_addr_init(void __iomem *regs, dma_addr_t addr)386{387 spin_lock_init(&idma.lock);388 idma.regs = regs;389 idma.lp_tx_addr = addr;390}391EXPORT_SYMBOL_GPL(idma_reg_addr_init);392 393static const struct snd_soc_component_driver asoc_idma_platform = {394 .open = idma_open,395 .close = idma_close,396 .trigger = idma_trigger,397 .pointer = idma_pointer,398 .mmap = idma_mmap,399 .hw_params = idma_hw_params,400 .hw_free = idma_hw_free,401 .prepare = idma_prepare,402 .pcm_construct = idma_new,403 .pcm_destruct = idma_free,404};405 406static int asoc_idma_platform_probe(struct platform_device *pdev)407{408 idma_irq = platform_get_irq(pdev, 0);409 if (idma_irq < 0)410 return idma_irq;411 412 return devm_snd_soc_register_component(&pdev->dev, &asoc_idma_platform,413 NULL, 0);414}415 416static struct platform_driver asoc_idma_driver = {417 .driver = {418 .name = "samsung-idma",419 },420 421 .probe = asoc_idma_platform_probe,422};423 424module_platform_driver(asoc_idma_driver);425 426MODULE_AUTHOR("Jaswinder Singh, <jassisinghbrar@gmail.com>");427MODULE_DESCRIPTION("Samsung ASoC IDMA Driver");428MODULE_LICENSE("GPL");429