cregit-Linux how code gets into the kernel

Release 4.8 sound/sh/aica.c

Directory: sound/sh
/*
* This code is licenced under 
* the General Public Licence
* version 2
*
* Copyright Adrian McMenamin 2005, 2006, 2007
* <adrian@mcmen.demon.co.uk>
* Requires firmware (BSD licenced) available from:
* http://linuxdc.cvs.sourceforge.net/linuxdc/linux-sh-dc/sound/oss/aica/firmware/
* or the maintainer
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of version 2 of the GNU General Public License as published by
* the Free Software Foundation.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
*
*/

#include <linux/init.h>
#include <linux/jiffies.h>
#include <linux/slab.h>
#include <linux/time.h>
#include <linux/wait.h>
#include <linux/module.h>
#include <linux/platform_device.h>
#include <linux/firmware.h>
#include <linux/timer.h>
#include <linux/delay.h>
#include <linux/workqueue.h>
#include <linux/io.h>
#include <sound/core.h>
#include <sound/control.h>
#include <sound/pcm.h>
#include <sound/initval.h>
#include <sound/info.h>
#include <asm/dma.h>
#include <mach/sysasic.h>
#include "aica.h"

MODULE_AUTHOR("Adrian McMenamin <adrian@mcmen.demon.co.uk>");
MODULE_DESCRIPTION("Dreamcast AICA sound (pcm) driver");
MODULE_LICENSE("GPL");
MODULE_SUPPORTED_DEVICE("{{Yamaha/SEGA, AICA}}");
MODULE_FIRMWARE("aica_firmware.bin");

/* module parameters */

#define CARD_NAME "AICA"

static int index = -1;

static char *id;

static bool enable = 1;
module_param(index, int, 0444);
MODULE_PARM_DESC(index, "Index value for " CARD_NAME " soundcard.");
module_param(id, charp, 0444);
MODULE_PARM_DESC(id, "ID string for " CARD_NAME " soundcard.");
module_param(enable, bool, 0644);
MODULE_PARM_DESC(enable, "Enable " CARD_NAME " soundcard.");

/* Simple platform device */

static struct platform_device *pd;

static struct resource aica_memory_space[2] = {
	{
	 .name = "AICA ARM CONTROL",
	 .start = ARM_RESET_REGISTER,
	 .flags = IORESOURCE_MEM,
	 .end = ARM_RESET_REGISTER + 3,
         },
	{
	 .name = "AICA Sound RAM",
	 .start = SPU_MEMORY_BASE,
	 .flags = IORESOURCE_MEM,
	 .end = SPU_MEMORY_BASE + 0x200000 - 1,
         },
};

/* SPU specific functions */
/* spu_write_wait - wait for G2-SH FIFO to clear */

static void spu_write_wait(void) { int time_count; time_count = 0; while (1) { if (!(readl(G2_FIFO) & 0x11)) break; /* To ensure hardware failure doesn't wedge kernel */ time_count++; if (time_count > 0x10000) { snd_printk ("WARNING: G2 FIFO appears to be blocked.\n"); break; } } }

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/* spu_memset - write to memory in SPU address space */
static void spu_memset(u32 toi, u32 what, int length) { int i; unsigned long flags; if (snd_BUG_ON(length % 4)) return; for (i = 0; i < length; i++) { if (!(i % 8)) spu_write_wait(); local_irq_save(flags); writel(what, toi + SPU_MEMORY_BASE); local_irq_restore(flags); toi++; } }

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/* spu_memload - write to SPU address space */
static void spu_memload(u32 toi, void *from, int length) { unsigned long flags; u32 *froml = from; u32 __iomem *to = (u32 __iomem *) (SPU_MEMORY_BASE + toi); int i; u32 val; length = DIV_ROUND_UP(length, 4); spu_write_wait(); for (i = 0; i < length; i++) { if (!(i % 8)) spu_write_wait(); val = *froml; local_irq_save(flags); writel(val, to); local_irq_restore(flags); froml++; to++; } }

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/* spu_disable - set spu registers to stop sound output */
static void spu_disable(void) { int i; unsigned long flags; u32 regval; spu_write_wait(); regval = readl(ARM_RESET_REGISTER); regval |= 1; spu_write_wait(); local_irq_save(flags); writel(regval, ARM_RESET_REGISTER); local_irq_restore(flags); for (i = 0; i < 64; i++) { spu_write_wait(); regval = readl(SPU_REGISTER_BASE + (i * 0x80)); regval = (regval & ~0x4000) | 0x8000; spu_write_wait(); local_irq_save(flags); writel(regval, SPU_REGISTER_BASE + (i * 0x80)); local_irq_restore(flags); } }

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/* spu_enable - set spu registers to enable sound output */
static void spu_enable(void) { unsigned long flags; u32 regval = readl(ARM_RESET_REGISTER); regval &= ~1; spu_write_wait(); local_irq_save(flags); writel(regval, ARM_RESET_REGISTER); local_irq_restore(flags); }

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/* * Halt the sound processor, clear the memory, * load some default ARM7 code, and then restart ARM7 */
static void spu_reset(void) { unsigned long flags; spu_disable(); spu_memset(0, 0, 0x200000 / 4); /* Put ARM7 in endless loop */ local_irq_save(flags); __raw_writel(0xea000002, SPU_MEMORY_BASE); local_irq_restore(flags); spu_enable(); }

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/* aica_chn_start - write to spu to start playback */
static void aica_chn_start(void) { unsigned long flags; spu_write_wait(); local_irq_save(flags); writel(AICA_CMD_KICK | AICA_CMD_START, (u32 *) AICA_CONTROL_POINT); local_irq_restore(flags); }

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/* aica_chn_halt - write to spu to halt playback */
static void aica_chn_halt(void) { unsigned long flags; spu_write_wait(); local_irq_save(flags); writel(AICA_CMD_KICK | AICA_CMD_STOP, (u32 *) AICA_CONTROL_POINT); local_irq_restore(flags); }

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/* ALSA code below */ static struct snd_pcm_hardware snd_pcm_aica_playback_hw = { .info = (SNDRV_PCM_INFO_NONINTERLEAVED), .formats = (SNDRV_PCM_FMTBIT_S8 | SNDRV_PCM_FMTBIT_S16_LE | SNDRV_PCM_FMTBIT_IMA_ADPCM), .rates = SNDRV_PCM_RATE_8000_48000, .rate_min = 8000, .rate_max = 48000, .channels_min = 1, .channels_max = 2, .buffer_bytes_max = AICA_BUFFER_SIZE, .period_bytes_min = AICA_PERIOD_SIZE, .period_bytes_max = AICA_PERIOD_SIZE, .periods_min = AICA_PERIOD_NUMBER, .periods_max = AICA_PERIOD_NUMBER, };
static int aica_dma_transfer(int channels, int buffer_size, struct snd_pcm_substream *substream) { int q, err, period_offset; struct snd_card_aica *dreamcastcard; struct snd_pcm_runtime *runtime; unsigned long flags; err = 0; dreamcastcard = substream->pcm->private_data; period_offset = dreamcastcard->clicks; period_offset %= (AICA_PERIOD_NUMBER / channels); runtime = substream->runtime; for (q = 0; q < channels; q++) { local_irq_save(flags); err = dma_xfer(AICA_DMA_CHANNEL, (unsigned long) (runtime->dma_area + (AICA_BUFFER_SIZE * q) / channels + AICA_PERIOD_SIZE * period_offset), AICA_CHANNEL0_OFFSET + q * CHANNEL_OFFSET + AICA_PERIOD_SIZE * period_offset, buffer_size / channels, AICA_DMA_MODE); if (unlikely(err < 0)) { local_irq_restore(flags); break; } dma_wait_for_completion(AICA_DMA_CHANNEL); local_irq_restore(flags); } return err; }

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static void startup_aica(struct snd_card_aica *dreamcastcard) { spu_memload(AICA_CHANNEL0_CONTROL_OFFSET, dreamcastcard->channel, sizeof(struct aica_channel)); aica_chn_start(); }

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static void run_spu_dma(struct work_struct *work) { int buffer_size; struct snd_pcm_runtime *runtime; struct snd_card_aica *dreamcastcard; dreamcastcard = container_of(work, struct snd_card_aica, spu_dma_work); runtime = dreamcastcard->substream->runtime; if (unlikely(dreamcastcard->dma_check == 0)) { buffer_size = frames_to_bytes(runtime, runtime->buffer_size); if (runtime->channels > 1) dreamcastcard->channel->flags |= 0x01; aica_dma_transfer(runtime->channels, buffer_size, dreamcastcard->substream); startup_aica(dreamcastcard); dreamcastcard->clicks = buffer_size / (AICA_PERIOD_SIZE * runtime->channels); return; } else { aica_dma_transfer(runtime->channels, AICA_PERIOD_SIZE * runtime->channels, dreamcastcard->substream); snd_pcm_period_elapsed(dreamcastcard->substream); dreamcastcard->clicks++; if (unlikely(dreamcastcard->clicks >= AICA_PERIOD_NUMBER)) dreamcastcard->clicks %= AICA_PERIOD_NUMBER; mod_timer(&dreamcastcard->timer, jiffies + 1); } }

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static void aica_period_elapsed(unsigned long timer_var) { /*timer function - so cannot sleep */ int play_period; struct snd_pcm_runtime *runtime; struct snd_pcm_substream *substream; struct snd_card_aica *dreamcastcard; substream = (struct snd_pcm_substream *) timer_var; runtime = substream->runtime; dreamcastcard = substream->pcm->private_data; /* Have we played out an additional period? */ play_period = frames_to_bytes(runtime, readl (AICA_CONTROL_CHANNEL_SAMPLE_NUMBER)) / AICA_PERIOD_SIZE; if (play_period == dreamcastcard->current_period) { /* reschedule the timer */ mod_timer(&(dreamcastcard->timer), jiffies + 1); return; } if (runtime->channels > 1) dreamcastcard->current_period = play_period; if (unlikely(dreamcastcard->dma_check == 0)) dreamcastcard->dma_check = 1; schedule_work(&(dreamcastcard->spu_dma_work)); }

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static void spu_begin_dma(struct snd_pcm_substream *substream) { struct snd_card_aica *dreamcastcard; struct snd_pcm_runtime *runtime; runtime = substream->runtime; dreamcastcard = substream->pcm->private_data; /*get the queue to do the work */ schedule_work(&(dreamcastcard->spu_dma_work)); /* Timer may already be running */ if (unlikely(dreamcastcard->timer.data)) { mod_timer(&dreamcastcard->timer, jiffies + 4); return; } setup_timer(&dreamcastcard->timer, aica_period_elapsed, (unsigned long) substream); mod_timer(&dreamcastcard->timer, jiffies + 4); }

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static int snd_aicapcm_pcm_open(struct snd_pcm_substream *substream) { struct snd_pcm_runtime *runtime; struct aica_channel *channel; struct snd_card_aica *dreamcastcard; if (!enable) return -ENOENT; dreamcastcard = substream->pcm->private_data; channel = kmalloc(sizeof(struct aica_channel), GFP_KERNEL); if (!channel) return -ENOMEM; /* set defaults for channel */ channel->sfmt = SM_8BIT; channel->cmd = AICA_CMD_START; channel->vol = dreamcastcard->master_volume; channel->pan = 0x80; channel->pos = 0; channel->flags = 0; /* default to mono */ dreamcastcard->channel = channel; runtime = substream->runtime; runtime->hw = snd_pcm_aica_playback_hw; spu_enable(); dreamcastcard->clicks = 0; dreamcastcard->current_period = 0; dreamcastcard->dma_check = 0; return 0; }

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static int snd_aicapcm_pcm_close(struct snd_pcm_substream *substream) { struct snd_card_aica *dreamcastcard = substream->pcm->private_data; flush_work(&(dreamcastcard->spu_dma_work)); if (dreamcastcard->timer.data) del_timer(&dreamcastcard->timer); kfree(dreamcastcard->channel); spu_disable(); return 0; }

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static int snd_aicapcm_pcm_hw_free(struct snd_pcm_substream *substream) { /* Free the DMA buffer */ return snd_pcm_lib_free_pages(substream); }

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static int snd_aicapcm_pcm_hw_params(struct snd_pcm_substream *substream, struct snd_pcm_hw_params *hw_params) { /* Allocate a DMA buffer using ALSA built-ins */ return snd_pcm_lib_malloc_pages(substream, params_buffer_bytes(hw_params)); }

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static int snd_aicapcm_pcm_prepare(struct snd_pcm_substream *substream) { struct snd_card_aica *dreamcastcard = substream->pcm->private_data; if ((substream->runtime)->format == SNDRV_PCM_FORMAT_S16_LE) dreamcastcard->channel->sfmt = SM_16BIT; dreamcastcard->channel->freq = substream->runtime->rate; dreamcastcard->substream = substream; return 0; }

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static int snd_aicapcm_pcm_trigger(struct snd_pcm_substream *substream, int cmd) { switch (cmd) { case SNDRV_PCM_TRIGGER_START: spu_begin_dma(substream); break; case SNDRV_PCM_TRIGGER_STOP: aica_chn_halt(); break; default: return -EINVAL; } return 0; }

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static unsigned long snd_aicapcm_pcm_pointer(struct snd_pcm_substream *substream) { return readl(AICA_CONTROL_CHANNEL_SAMPLE_NUMBER); }

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static struct snd_pcm_ops snd_aicapcm_playback_ops = { .open = snd_aicapcm_pcm_open, .close = snd_aicapcm_pcm_close, .ioctl = snd_pcm_lib_ioctl, .hw_params = snd_aicapcm_pcm_hw_params, .hw_free = snd_aicapcm_pcm_hw_free, .prepare = snd_aicapcm_pcm_prepare, .trigger = snd_aicapcm_pcm_trigger, .pointer = snd_aicapcm_pcm_pointer, }; /* TO DO: set up to handle more than one pcm instance */
static int __init snd_aicapcmchip(struct snd_card_aica *dreamcastcard, int pcm_index) { struct snd_pcm *pcm; int err; /* AICA has no capture ability */ err = snd_pcm_new(dreamcastcard->card, "AICA PCM", pcm_index, 1, 0, &pcm); if (unlikely(err < 0)) return err; pcm->private_data = dreamcastcard; strcpy(pcm->name, "AICA PCM"); snd_pcm_set_ops(pcm, SNDRV_PCM_STREAM_PLAYBACK, &snd_aicapcm_playback_ops); /* Allocate the DMA buffers */ err = snd_pcm_lib_preallocate_pages_for_all(pcm, SNDRV_DMA_TYPE_CONTINUOUS, snd_dma_continuous_data (GFP_KERNEL), AICA_BUFFER_SIZE, AICA_BUFFER_SIZE); return err; }

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/* Mixer controls */ #define aica_pcmswitch_info snd_ctl_boolean_mono_info
static int aica_pcmswitch_get(struct snd_kcontrol *kcontrol, struct snd_ctl_elem_value *ucontrol) { ucontrol->value.integer.value[0] = 1; /* TO DO: Fix me */ return 0; }

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static int aica_pcmswitch_put(struct snd_kcontrol *kcontrol, struct snd_ctl_elem_value *ucontrol) { if (ucontrol->value.integer.value[0] == 1) return 0; /* TO DO: Fix me */ else aica_chn_halt(); return 0; }

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static int aica_pcmvolume_info(struct snd_kcontrol *kcontrol, struct snd_ctl_elem_info *uinfo) { uinfo->type = SNDRV_CTL_ELEM_TYPE_INTEGER; uinfo->count = 1; uinfo->value.integer.min = 0; uinfo->value.integer.max = 0xFF; return 0; }

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static int aica_pcmvolume_get(struct snd_kcontrol *kcontrol, struct snd_ctl_elem_value *ucontrol) { struct snd_card_aica *dreamcastcard; dreamcastcard = kcontrol->private_data; if (unlikely(!dreamcastcard->channel)) return -ETXTBSY; /* we've not yet been set up */ ucontrol->value.integer.value[0] = dreamcastcard->channel->vol; return 0; }

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static int aica_pcmvolume_put(struct snd_kcontrol *kcontrol, struct snd_ctl_elem_value *ucontrol) { struct snd_card_aica *dreamcastcard; unsigned int vol; dreamcastcard = kcontrol->private_data; if (unlikely(!dreamcastcard->channel)) return -ETXTBSY; vol = ucontrol->value.integer.value[0]; if (vol > 0xff) return -EINVAL; if (unlikely(dreamcastcard->channel->vol == vol)) return 0; dreamcastcard->channel->vol = ucontrol->value.integer.value[0]; dreamcastcard->master_volume = ucontrol->value.integer.value[0]; spu_memload(AICA_CHANNEL0_CONTROL_OFFSET, dreamcastcard->channel, sizeof(struct aica_channel)); return 1; }

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static struct snd_kcontrol_new snd_aica_pcmswitch_control = { .iface = SNDRV_CTL_ELEM_IFACE_MIXER, .name = "PCM Playback Switch", .index = 0, .info = aica_pcmswitch_info, .get = aica_pcmswitch_get, .put = aica_pcmswitch_put }; static struct snd_kcontrol_new snd_aica_pcmvolume_control = { .iface = SNDRV_CTL_ELEM_IFACE_MIXER, .name = "PCM Playback Volume", .index = 0, .info = aica_pcmvolume_info, .get = aica_pcmvolume_get, .put = aica_pcmvolume_put };
static int load_aica_firmware(void) { int err; const struct firmware *fw_entry; spu_reset(); err = request_firmware(&fw_entry, "aica_firmware.bin", &pd->dev); if (unlikely(err)) return err; /* write firmware into memory */ spu_disable(); spu_memload(0, fw_entry->data, fw_entry->size); spu_enable(); release_firmware(fw_entry); return err; }

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static int add_aicamixer_controls(struct snd_card_aica *dreamcastcard) { int err; err = snd_ctl_add (dreamcastcard->card, snd_ctl_new1(&snd_aica_pcmvolume_control, dreamcastcard)); if (unlikely(err < 0)) return err; err = snd_ctl_add (dreamcastcard->card, snd_ctl_new1(&snd_aica_pcmswitch_control, dreamcastcard)); if (unlikely(err < 0)) return err; return 0; }

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static int snd_aica_remove(struct platform_device *devptr) { struct snd_card_aica *dreamcastcard; dreamcastcard = platform_get_drvdata(devptr); if (unlikely(!dreamcastcard)) return -ENODEV; snd_card_free(dreamcastcard->card); kfree(dreamcastcard); return 0; }

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static int snd_aica_probe(struct platform_device *devptr) { int err; struct snd_card_aica *dreamcastcard; dreamcastcard = kmalloc(sizeof(struct snd_card_aica), GFP_KERNEL); if (unlikely(!dreamcastcard)) return -ENOMEM; err = snd_card_new(&devptr->dev, index, SND_AICA_DRIVER, THIS_MODULE, 0, &dreamcastcard->card); if (unlikely(err < 0)) { kfree(dreamcastcard); return err; } strcpy(dreamcastcard->card->driver, "snd_aica"); strcpy(dreamcastcard->card->shortname, SND_AICA_DRIVER); strcpy(dreamcastcard->card->longname, "Yamaha AICA Super Intelligent Sound Processor for SEGA Dreamcast"); /* Prepare to use the queue */ INIT_WORK(&(dreamcastcard->spu_dma_work), run_spu_dma); /* Load the PCM 'chip' */ err = snd_aicapcmchip(dreamcastcard, 0); if (unlikely(err < 0)) goto freedreamcast; dreamcastcard->timer.data = 0; dreamcastcard->channel = NULL; /* Add basic controls */ err = add_aicamixer_controls(dreamcastcard); if (unlikely(err < 0)) goto freedreamcast; /* Register the card with ALSA subsystem */ err = snd_card_register(dreamcastcard->card); if (unlikely(err < 0)