diff options
Diffstat (limited to 'ANDROID_3.4.5/sound/soc/sh/dma-sh7760.c')
| -rw-r--r-- | ANDROID_3.4.5/sound/soc/sh/dma-sh7760.c | 376 |
1 files changed, 0 insertions, 376 deletions
diff --git a/ANDROID_3.4.5/sound/soc/sh/dma-sh7760.c b/ANDROID_3.4.5/sound/soc/sh/dma-sh7760.c deleted file mode 100644 index 7da20186..00000000 --- a/ANDROID_3.4.5/sound/soc/sh/dma-sh7760.c +++ /dev/null @@ -1,376 +0,0 @@ -/* - * SH7760 ("camelot") DMABRG audio DMA unit support - * - * Copyright (C) 2007 Manuel Lauss <mano@roarinelk.homelinux.net> - * licensed under the terms outlined in the file COPYING at the root - * of the linux kernel sources. - * - * The SH7760 DMABRG provides 4 dma channels (2x rec, 2x play), which - * trigger an interrupt when one half of the programmed transfer size - * has been xmitted. - * - * FIXME: little-endian only for now - */ - -#include <linux/module.h> -#include <linux/gfp.h> -#include <linux/init.h> -#include <linux/platform_device.h> -#include <linux/dma-mapping.h> -#include <sound/core.h> -#include <sound/pcm.h> -#include <sound/pcm_params.h> -#include <sound/soc.h> -#include <asm/dmabrg.h> - - -/* registers and bits */ -#define BRGATXSAR 0x00 -#define BRGARXDAR 0x04 -#define BRGATXTCR 0x08 -#define BRGARXTCR 0x0C -#define BRGACR 0x10 -#define BRGATXTCNT 0x14 -#define BRGARXTCNT 0x18 - -#define ACR_RAR (1 << 18) -#define ACR_RDS (1 << 17) -#define ACR_RDE (1 << 16) -#define ACR_TAR (1 << 2) -#define ACR_TDS (1 << 1) -#define ACR_TDE (1 << 0) - -/* receiver/transmitter data alignment */ -#define ACR_RAM_NONE (0 << 24) -#define ACR_RAM_4BYTE (1 << 24) -#define ACR_RAM_2WORD (2 << 24) -#define ACR_TAM_NONE (0 << 8) -#define ACR_TAM_4BYTE (1 << 8) -#define ACR_TAM_2WORD (2 << 8) - - -struct camelot_pcm { - unsigned long mmio; /* DMABRG audio channel control reg MMIO */ - unsigned int txid; /* ID of first DMABRG IRQ for this unit */ - - struct snd_pcm_substream *tx_ss; - unsigned long tx_period_size; - unsigned int tx_period; - - struct snd_pcm_substream *rx_ss; - unsigned long rx_period_size; - unsigned int rx_period; - -} cam_pcm_data[2] = { - { - .mmio = 0xFE3C0040, - .txid = DMABRGIRQ_A0TXF, - }, - { - .mmio = 0xFE3C0060, - .txid = DMABRGIRQ_A1TXF, - }, -}; - -#define BRGREG(x) (*(unsigned long *)(cam->mmio + (x))) - -/* - * set a minimum of 16kb per period, to avoid interrupt-"storm" and - * resulting skipping. In general, the bigger the minimum size, the - * better for overall system performance. (The SH7760 is a puny CPU - * with a slow SDRAM interface and poor internal bus bandwidth, - * *especially* when the LCDC is active). The minimum for the DMAC - * is 8 bytes; 16kbytes are enough to get skip-free playback of a - * 44kHz/16bit/stereo MP3 on a lightly loaded system, and maintain - * reasonable responsiveness in MPlayer. - */ -#define DMABRG_PERIOD_MIN 16 * 1024 -#define DMABRG_PERIOD_MAX 0x03fffffc -#define DMABRG_PREALLOC_BUFFER 32 * 1024 -#define DMABRG_PREALLOC_BUFFER_MAX 32 * 1024 - -/* support everything the SSI supports */ -#define DMABRG_RATES \ - SNDRV_PCM_RATE_8000_192000 - -#define DMABRG_FMTS \ - (SNDRV_PCM_FMTBIT_S8 | SNDRV_PCM_FMTBIT_U8 | \ - SNDRV_PCM_FMTBIT_S16_LE | SNDRV_PCM_FMTBIT_U16_LE | \ - SNDRV_PCM_FMTBIT_S20_3LE | SNDRV_PCM_FMTBIT_U20_3LE | \ - SNDRV_PCM_FMTBIT_S24_3LE | SNDRV_PCM_FMTBIT_U24_3LE | \ - SNDRV_PCM_FMTBIT_S32_LE | SNDRV_PCM_FMTBIT_U32_LE) - -static struct snd_pcm_hardware camelot_pcm_hardware = { - .info = (SNDRV_PCM_INFO_MMAP | - SNDRV_PCM_INFO_INTERLEAVED | - SNDRV_PCM_INFO_BLOCK_TRANSFER | - SNDRV_PCM_INFO_MMAP_VALID | - SNDRV_PCM_INFO_BATCH), - .formats = DMABRG_FMTS, - .rates = DMABRG_RATES, - .rate_min = 8000, - .rate_max = 192000, - .channels_min = 2, - .channels_max = 8, /* max of the SSI */ - .buffer_bytes_max = DMABRG_PERIOD_MAX, - .period_bytes_min = DMABRG_PERIOD_MIN, - .period_bytes_max = DMABRG_PERIOD_MAX / 2, - .periods_min = 2, - .periods_max = 2, - .fifo_size = 128, -}; - -static void camelot_txdma(void *data) -{ - struct camelot_pcm *cam = data; - cam->tx_period ^= 1; - snd_pcm_period_elapsed(cam->tx_ss); -} - -static void camelot_rxdma(void *data) -{ - struct camelot_pcm *cam = data; - cam->rx_period ^= 1; - snd_pcm_period_elapsed(cam->rx_ss); -} - -static int camelot_pcm_open(struct snd_pcm_substream *substream) -{ - struct snd_soc_pcm_runtime *rtd = substream->private_data; - struct camelot_pcm *cam = &cam_pcm_data[rtd->cpu_dai->id]; - int recv = substream->stream == SNDRV_PCM_STREAM_PLAYBACK ? 0:1; - int ret, dmairq; - - snd_soc_set_runtime_hwparams(substream, &camelot_pcm_hardware); - - /* DMABRG buffer half/full events */ - dmairq = (recv) ? cam->txid + 2 : cam->txid; - if (recv) { - cam->rx_ss = substream; - ret = dmabrg_request_irq(dmairq, camelot_rxdma, cam); - if (unlikely(ret)) { - pr_debug("audio unit %d irqs already taken!\n", - rtd->cpu_dai->id); - return -EBUSY; - } - (void)dmabrg_request_irq(dmairq + 1,camelot_rxdma, cam); - } else { - cam->tx_ss = substream; - ret = dmabrg_request_irq(dmairq, camelot_txdma, cam); - if (unlikely(ret)) { - pr_debug("audio unit %d irqs already taken!\n", - rtd->cpu_dai->id); - return -EBUSY; - } - (void)dmabrg_request_irq(dmairq + 1, camelot_txdma, cam); - } - return 0; -} - -static int camelot_pcm_close(struct snd_pcm_substream *substream) -{ - struct snd_soc_pcm_runtime *rtd = substream->private_data; - struct camelot_pcm *cam = &cam_pcm_data[rtd->cpu_dai->id]; - int recv = substream->stream == SNDRV_PCM_STREAM_PLAYBACK ? 0:1; - int dmairq; - - dmairq = (recv) ? cam->txid + 2 : cam->txid; - - if (recv) - cam->rx_ss = NULL; - else - cam->tx_ss = NULL; - - dmabrg_free_irq(dmairq + 1); - dmabrg_free_irq(dmairq); - - return 0; -} - -static int camelot_hw_params(struct snd_pcm_substream *substream, - struct snd_pcm_hw_params *hw_params) -{ - struct snd_soc_pcm_runtime *rtd = substream->private_data; - struct camelot_pcm *cam = &cam_pcm_data[rtd->cpu_dai->id]; - int recv = substream->stream == SNDRV_PCM_STREAM_PLAYBACK ? 0:1; - int ret; - - ret = snd_pcm_lib_malloc_pages(substream, - params_buffer_bytes(hw_params)); - if (ret < 0) - return ret; - - if (recv) { - cam->rx_period_size = params_period_bytes(hw_params); - cam->rx_period = 0; - } else { - cam->tx_period_size = params_period_bytes(hw_params); - cam->tx_period = 0; - } - return 0; -} - -static int camelot_hw_free(struct snd_pcm_substream *substream) -{ - return snd_pcm_lib_free_pages(substream); -} - -static int camelot_prepare(struct snd_pcm_substream *substream) -{ - struct snd_pcm_runtime *runtime = substream->runtime; - struct snd_soc_pcm_runtime *rtd = substream->private_data; - struct camelot_pcm *cam = &cam_pcm_data[rtd->cpu_dai->id]; - - pr_debug("PCM data: addr 0x%08ulx len %d\n", - (u32)runtime->dma_addr, runtime->dma_bytes); - - if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) { - BRGREG(BRGATXSAR) = (unsigned long)runtime->dma_area; - BRGREG(BRGATXTCR) = runtime->dma_bytes; - } else { - BRGREG(BRGARXDAR) = (unsigned long)runtime->dma_area; - BRGREG(BRGARXTCR) = runtime->dma_bytes; - } - - return 0; -} - -static inline void dmabrg_play_dma_start(struct camelot_pcm *cam) -{ - unsigned long acr = BRGREG(BRGACR) & ~(ACR_TDS | ACR_RDS); - /* start DMABRG engine: XFER start, auto-addr-reload */ - BRGREG(BRGACR) = acr | ACR_TDE | ACR_TAR | ACR_TAM_2WORD; -} - -static inline void dmabrg_play_dma_stop(struct camelot_pcm *cam) -{ - unsigned long acr = BRGREG(BRGACR) & ~(ACR_TDS | ACR_RDS); - /* forcibly terminate data transmission */ - BRGREG(BRGACR) = acr | ACR_TDS; -} - -static inline void dmabrg_rec_dma_start(struct camelot_pcm *cam) -{ - unsigned long acr = BRGREG(BRGACR) & ~(ACR_TDS | ACR_RDS); - /* start DMABRG engine: recv start, auto-reload */ - BRGREG(BRGACR) = acr | ACR_RDE | ACR_RAR | ACR_RAM_2WORD; -} - -static inline void dmabrg_rec_dma_stop(struct camelot_pcm *cam) -{ - unsigned long acr = BRGREG(BRGACR) & ~(ACR_TDS | ACR_RDS); - /* forcibly terminate data receiver */ - BRGREG(BRGACR) = acr | ACR_RDS; -} - -static int camelot_trigger(struct snd_pcm_substream *substream, int cmd) -{ - struct snd_soc_pcm_runtime *rtd = substream->private_data; - struct camelot_pcm *cam = &cam_pcm_data[rtd->cpu_dai->id]; - int recv = substream->stream == SNDRV_PCM_STREAM_PLAYBACK ? 0:1; - - switch (cmd) { - case SNDRV_PCM_TRIGGER_START: - if (recv) - dmabrg_rec_dma_start(cam); - else - dmabrg_play_dma_start(cam); - break; - case SNDRV_PCM_TRIGGER_STOP: - if (recv) - dmabrg_rec_dma_stop(cam); - else - dmabrg_play_dma_stop(cam); - break; - default: - return -EINVAL; - } - - return 0; -} - -static snd_pcm_uframes_t camelot_pos(struct snd_pcm_substream *substream) -{ - struct snd_pcm_runtime *runtime = substream->runtime; - struct snd_soc_pcm_runtime *rtd = substream->private_data; - struct camelot_pcm *cam = &cam_pcm_data[rtd->cpu_dai->id]; - int recv = substream->stream == SNDRV_PCM_STREAM_PLAYBACK ? 0:1; - unsigned long pos; - - /* cannot use the DMABRG pointer register: under load, by the - * time ALSA comes around to read the register, it is already - * far ahead (or worse, already done with the fragment) of the - * position at the time the IRQ was triggered, which results in - * fast-playback sound in my test application (ScummVM) - */ - if (recv) - pos = cam->rx_period ? cam->rx_period_size : 0; - else - pos = cam->tx_period ? cam->tx_period_size : 0; - - return bytes_to_frames(runtime, pos); -} - -static struct snd_pcm_ops camelot_pcm_ops = { - .open = camelot_pcm_open, - .close = camelot_pcm_close, - .ioctl = snd_pcm_lib_ioctl, - .hw_params = camelot_hw_params, - .hw_free = camelot_hw_free, - .prepare = camelot_prepare, - .trigger = camelot_trigger, - .pointer = camelot_pos, -}; - -static void camelot_pcm_free(struct snd_pcm *pcm) -{ - snd_pcm_lib_preallocate_free_for_all(pcm); -} - -static int camelot_pcm_new(struct snd_soc_pcm_runtime *rtd) -{ - struct snd_pcm *pcm = rtd->pcm; - - /* dont use SNDRV_DMA_TYPE_DEV, since it will oops the SH kernel - * in MMAP mode (i.e. aplay -M) - */ - snd_pcm_lib_preallocate_pages_for_all(pcm, - SNDRV_DMA_TYPE_CONTINUOUS, - snd_dma_continuous_data(GFP_KERNEL), - DMABRG_PREALLOC_BUFFER, DMABRG_PREALLOC_BUFFER_MAX); - - return 0; -} - -static struct snd_soc_platform sh7760_soc_platform = { - .pcm_ops = &camelot_pcm_ops, - .pcm_new = camelot_pcm_new, - .pcm_free = camelot_pcm_free, -}; - -static int __devinit sh7760_soc_platform_probe(struct platform_device *pdev) -{ - return snd_soc_register_platform(&pdev->dev, &sh7760_soc_platform); -} - -static int __devexit sh7760_soc_platform_remove(struct platform_device *pdev) -{ - snd_soc_unregister_platform(&pdev->dev); - return 0; -} - -static struct platform_driver sh7760_pcm_driver = { - .driver = { - .name = "sh7760-pcm-audio", - .owner = THIS_MODULE, - }, - - .probe = sh7760_soc_platform_probe, - .remove = __devexit_p(sh7760_soc_platform_remove), -}; - -module_platform_driver(sh7760_pcm_driver); - -MODULE_LICENSE("GPL"); -MODULE_DESCRIPTION("SH7760 Audio DMA (DMABRG) driver"); -MODULE_AUTHOR("Manuel Lauss <mano@roarinelk.homelinux.net>"); |