+++ /dev/null
-/*
- * sound/soc/samsung/idma.c
- *
- * Copyright (c) 2011 Samsung Electronics Co., Ltd.
- * http://www.samsung.com
- *
- * I2S0's Internal DMA driver
- *
- * This program is free software; you can redistribute it and/or modify it
- * under the terms of the GNU General Public License as published by the
- * Free Software Foundation; either version 2 of the License, or (at your
- * option) any later version.
- */
-#include <linux/interrupt.h>
-#include <linux/platform_device.h>
-#include <linux/dma-mapping.h>
-#include <linux/slab.h>
-#include <sound/pcm.h>
-#include <sound/pcm_params.h>
-#include <sound/soc.h>
-
-#include "i2s.h"
-#include "idma.h"
-#include "dma.h"
-#include "i2s-regs.h"
-
-#define ST_RUNNING (1<<0)
-#define ST_OPENED (1<<1)
-
-static const struct snd_pcm_hardware idma_hardware = {
- .info = SNDRV_PCM_INFO_INTERLEAVED |
- SNDRV_PCM_INFO_BLOCK_TRANSFER |
- SNDRV_PCM_INFO_MMAP |
- SNDRV_PCM_INFO_MMAP_VALID |
- SNDRV_PCM_INFO_PAUSE |
- SNDRV_PCM_INFO_RESUME,
- .formats = SNDRV_PCM_FMTBIT_S16_LE |
- SNDRV_PCM_FMTBIT_U16_LE |
- SNDRV_PCM_FMTBIT_S24_LE |
- SNDRV_PCM_FMTBIT_U24_LE |
- SNDRV_PCM_FMTBIT_U8 |
- SNDRV_PCM_FMTBIT_S8,
- .channels_min = 2,
- .channels_max = 2,
- .buffer_bytes_max = MAX_IDMA_BUFFER,
- .period_bytes_min = 128,
- .period_bytes_max = MAX_IDMA_PERIOD,
- .periods_min = 1,
- .periods_max = 2,
-};
-
-struct idma_ctrl {
- spinlock_t lock;
- int state;
- dma_addr_t start;
- dma_addr_t pos;
- dma_addr_t end;
- dma_addr_t period;
- dma_addr_t periodsz;
- void *token;
- void (*cb)(void *dt, int bytes_xfer);
-};
-
-static struct idma_info {
- spinlock_t lock;
- void __iomem *regs;
- dma_addr_t lp_tx_addr;
-} idma;
-
-static void idma_getpos(dma_addr_t *src)
-{
- *src = idma.lp_tx_addr +
- (readl(idma.regs + I2STRNCNT) & 0xffffff) * 4;
-}
-
-static int idma_enqueue(struct snd_pcm_substream *substream)
-{
- struct snd_pcm_runtime *runtime = substream->runtime;
- struct idma_ctrl *prtd = substream->runtime->private_data;
- u32 val;
-
- spin_lock(&prtd->lock);
- prtd->token = (void *) substream;
- spin_unlock(&prtd->lock);
-
- /* Internal DMA Level0 Interrupt Address */
- val = idma.lp_tx_addr + prtd->periodsz;
- writel(val, idma.regs + I2SLVL0ADDR);
-
- /* Start address0 of I2S internal DMA operation. */
- val = idma.lp_tx_addr;
- writel(val, idma.regs + I2SSTR0);
-
- /*
- * Transfer block size for I2S internal DMA.
- * Should decide transfer size before start dma operation
- */
- val = readl(idma.regs + I2SSIZE);
- val &= ~(I2SSIZE_TRNMSK << I2SSIZE_SHIFT);
- val |= (((runtime->dma_bytes >> 2) &
- I2SSIZE_TRNMSK) << I2SSIZE_SHIFT);
- writel(val, idma.regs + I2SSIZE);
-
- val = readl(idma.regs + I2SAHB);
- val |= AHB_INTENLVL0;
- writel(val, idma.regs + I2SAHB);
-
- return 0;
-}
-
-static void idma_setcallbk(struct snd_pcm_substream *substream,
- void (*cb)(void *, int))
-{
- struct idma_ctrl *prtd = substream->runtime->private_data;
-
- spin_lock(&prtd->lock);
- prtd->cb = cb;
- spin_unlock(&prtd->lock);
-}
-
-static void idma_control(int op)
-{
- u32 val = readl(idma.regs + I2SAHB);
-
- spin_lock(&idma.lock);
-
- switch (op) {
- case LPAM_DMA_START:
- val |= (AHB_INTENLVL0 | AHB_DMAEN);
- break;
- case LPAM_DMA_STOP:
- val &= ~(AHB_INTENLVL0 | AHB_DMAEN);
- break;
- default:
- spin_unlock(&idma.lock);
- return;
- }
-
- writel(val, idma.regs + I2SAHB);
- spin_unlock(&idma.lock);
-}
-
-static void idma_done(void *id, int bytes_xfer)
-{
- struct snd_pcm_substream *substream = id;
- struct idma_ctrl *prtd = substream->runtime->private_data;
-
- if (prtd && (prtd->state & ST_RUNNING))
- snd_pcm_period_elapsed(substream);
-}
-
-static int idma_hw_params(struct snd_pcm_substream *substream,
- struct snd_pcm_hw_params *params)
-{
- struct snd_pcm_runtime *runtime = substream->runtime;
- struct idma_ctrl *prtd = substream->runtime->private_data;
- u32 mod = readl(idma.regs + I2SMOD);
- u32 ahb = readl(idma.regs + I2SAHB);
-
- ahb |= (AHB_DMARLD | AHB_INTMASK);
- mod |= MOD_TXS_IDMA;
- writel(ahb, idma.regs + I2SAHB);
- writel(mod, idma.regs + I2SMOD);
-
- snd_pcm_set_runtime_buffer(substream, &substream->dma_buffer);
- runtime->dma_bytes = params_buffer_bytes(params);
-
- prtd->start = prtd->pos = runtime->dma_addr;
- prtd->period = params_periods(params);
- prtd->periodsz = params_period_bytes(params);
- prtd->end = runtime->dma_addr + runtime->dma_bytes;
-
- idma_setcallbk(substream, idma_done);
-
- return 0;
-}
-
-static int idma_hw_free(struct snd_pcm_substream *substream)
-{
- snd_pcm_set_runtime_buffer(substream, NULL);
-
- return 0;
-}
-
-static int idma_prepare(struct snd_pcm_substream *substream)
-{
- struct idma_ctrl *prtd = substream->runtime->private_data;
-
- prtd->pos = prtd->start;
-
- /* flush the DMA channel */
- idma_control(LPAM_DMA_STOP);
- idma_enqueue(substream);
-
- return 0;
-}
-
-static int idma_trigger(struct snd_pcm_substream *substream, int cmd)
-{
- struct idma_ctrl *prtd = substream->runtime->private_data;
- int ret = 0;
-
- spin_lock(&prtd->lock);
-
- switch (cmd) {
- case SNDRV_PCM_TRIGGER_RESUME:
- case SNDRV_PCM_TRIGGER_START:
- case SNDRV_PCM_TRIGGER_PAUSE_RELEASE:
- prtd->state |= ST_RUNNING;
- idma_control(LPAM_DMA_START);
- break;
-
- case SNDRV_PCM_TRIGGER_SUSPEND:
- case SNDRV_PCM_TRIGGER_STOP:
- case SNDRV_PCM_TRIGGER_PAUSE_PUSH:
- prtd->state &= ~ST_RUNNING;
- idma_control(LPAM_DMA_STOP);
- break;
-
- default:
- ret = -EINVAL;
- break;
- }
-
- spin_unlock(&prtd->lock);
-
- return ret;
-}
-
-static snd_pcm_uframes_t
- idma_pointer(struct snd_pcm_substream *substream)
-{
- struct snd_pcm_runtime *runtime = substream->runtime;
- struct idma_ctrl *prtd = runtime->private_data;
- dma_addr_t src;
- unsigned long res;
-
- spin_lock(&prtd->lock);
-
- idma_getpos(&src);
- res = src - prtd->start;
-
- spin_unlock(&prtd->lock);
-
- return bytes_to_frames(substream->runtime, res);
-}
-
-static int idma_mmap(struct snd_pcm_substream *substream,
- struct vm_area_struct *vma)
-{
- struct snd_pcm_runtime *runtime = substream->runtime;
- unsigned long size, offset;
- int ret;
-
- /* From snd_pcm_lib_mmap_iomem */
- vma->vm_page_prot = pgprot_noncached(vma->vm_page_prot);
- vma->vm_flags |= VM_IO;
- size = vma->vm_end - vma->vm_start;
- offset = vma->vm_pgoff << PAGE_SHIFT;
- ret = io_remap_pfn_range(vma, vma->vm_start,
- (runtime->dma_addr + offset) >> PAGE_SHIFT,
- size, vma->vm_page_prot);
-
- return ret;
-}
-
-static irqreturn_t iis_irq(int irqno, void *dev_id)
-{
- struct idma_ctrl *prtd = (struct idma_ctrl *)dev_id;
- u32 iiscon, iisahb, val, addr;
-
- iisahb = readl(idma.regs + I2SAHB);
- iiscon = readl(idma.regs + I2SCON);
-
- val = (iisahb & AHB_LVL0INT) ? AHB_CLRLVL0INT : 0;
-
- if (val) {
- iisahb |= val;
- writel(iisahb, idma.regs + I2SAHB);
-
- addr = readl(idma.regs + I2SLVL0ADDR) - idma.lp_tx_addr;
- addr += prtd->periodsz;
- addr %= (prtd->end - prtd->start);
- addr += idma.lp_tx_addr;
-
- writel(addr, idma.regs + I2SLVL0ADDR);
-
- if (prtd->cb)
- prtd->cb(prtd->token, prtd->period);
- }
-
- return IRQ_HANDLED;
-}
-
-static int idma_open(struct snd_pcm_substream *substream)
-{
- struct snd_pcm_runtime *runtime = substream->runtime;
- struct idma_ctrl *prtd;
- int ret;
-
- snd_soc_set_runtime_hwparams(substream, &idma_hardware);
-
- prtd = kzalloc(sizeof(struct idma_ctrl), GFP_KERNEL);
- if (prtd == NULL)
- return -ENOMEM;
-
- ret = request_irq(IRQ_I2S0, iis_irq, 0, "i2s", prtd);
- if (ret < 0) {
- pr_err("fail to claim i2s irq , ret = %d\n", ret);
- kfree(prtd);
- return ret;
- }
-
- spin_lock_init(&prtd->lock);
-
- runtime->private_data = prtd;
-
- return 0;
-}
-
-static int idma_close(struct snd_pcm_substream *substream)
-{
- struct snd_pcm_runtime *runtime = substream->runtime;
- struct idma_ctrl *prtd = runtime->private_data;
-
- free_irq(IRQ_I2S0, prtd);
-
- if (!prtd)
- pr_err("idma_close called with prtd == NULL\n");
-
- kfree(prtd);
-
- return 0;
-}
-
-static struct snd_pcm_ops idma_ops = {
- .open = idma_open,
- .close = idma_close,
- .ioctl = snd_pcm_lib_ioctl,
- .trigger = idma_trigger,
- .pointer = idma_pointer,
- .mmap = idma_mmap,
- .hw_params = idma_hw_params,
- .hw_free = idma_hw_free,
- .prepare = idma_prepare,
-};
-
-static void idma_free(struct snd_pcm *pcm)
-{
- struct snd_pcm_substream *substream;
- struct snd_dma_buffer *buf;
-
- substream = pcm->streams[SNDRV_PCM_STREAM_PLAYBACK].substream;
- if (!substream)
- return;
-
- buf = &substream->dma_buffer;
- if (!buf->area)
- return;
-
- iounmap(buf->area);
-
- buf->area = NULL;
- buf->addr = 0;
-}
-
-static int preallocate_idma_buffer(struct snd_pcm *pcm, int stream)
-{
- struct snd_pcm_substream *substream = pcm->streams[stream].substream;
- struct snd_dma_buffer *buf = &substream->dma_buffer;
-
- buf->dev.dev = pcm->card->dev;
- buf->private_data = NULL;
-
- /* Assign PCM buffer pointers */
- buf->dev.type = SNDRV_DMA_TYPE_CONTINUOUS;
- buf->addr = idma.lp_tx_addr;
- buf->bytes = idma_hardware.buffer_bytes_max;
- buf->area = (unsigned char *)ioremap(buf->addr, buf->bytes);
-
- return 0;
-}
-
-static u64 idma_mask = DMA_BIT_MASK(32);
-
-static int idma_new(struct snd_soc_pcm_runtime *rtd)
-{
- struct snd_card *card = rtd->card->snd_card;
- struct snd_soc_dai *dai = rtd->cpu_dai;
- struct snd_pcm *pcm = rtd->pcm;
- int ret = 0;
-
- if (!card->dev->dma_mask)
- card->dev->dma_mask = &idma_mask;
- if (!card->dev->coherent_dma_mask)
- card->dev->coherent_dma_mask = DMA_BIT_MASK(32);
-
- if (dai->driver->playback.channels_min)
- ret = preallocate_idma_buffer(pcm,
- SNDRV_PCM_STREAM_PLAYBACK);
-
- return ret;
-}
-
-void idma_reg_addr_init(void *regs, dma_addr_t addr)
-{
- spin_lock_init(&idma.lock);
- idma.regs = regs;
- idma.lp_tx_addr = addr;
-}
-
-struct snd_soc_platform_driver asoc_idma_platform = {
- .ops = &idma_ops,
- .pcm_new = idma_new,
- .pcm_free = idma_free,
-};
-
-static int __devinit asoc_idma_platform_probe(struct platform_device *pdev)
-{
- return snd_soc_register_platform(&pdev->dev, &asoc_idma_platform);
-}
-
-static int __devexit asoc_idma_platform_remove(struct platform_device *pdev)
-{
- snd_soc_unregister_platform(&pdev->dev);
- return 0;
-}
-
-static struct platform_driver asoc_idma_driver = {
- .driver = {
- .name = "samsung-idma",
- .owner = THIS_MODULE,
- },
-
- .probe = asoc_idma_platform_probe,
- .remove = __devexit_p(asoc_idma_platform_remove),
-};
-
-static int __init asoc_idma_init(void)
-{
- return platform_driver_register(&asoc_idma_driver);
-}
-module_init(asoc_idma_init);
-
-static void __exit asoc_idma_exit(void)
-{
- platform_driver_unregister(&asoc_idma_driver);
-}
-module_exit(asoc_idma_exit);
-
-MODULE_AUTHOR("Jaswinder Singh, <jassisinghbrar@gmail.com>");
-MODULE_DESCRIPTION("Samsung ASoC IDMA Driver");
-MODULE_LICENSE("GPL");
projects / kernel / kernel-generic.git / commitdiff