diff options
Diffstat (limited to 'sound/mips/au1x00.c')
| -rw-r--r-- | sound/mips/au1x00.c | 686 |
1 files changed, 686 insertions, 0 deletions
diff --git a/sound/mips/au1x00.c b/sound/mips/au1x00.c new file mode 100644 index 0000000..c20522b --- /dev/null +++ b/sound/mips/au1x00.c @@ -0,0 +1,686 @@ +/* + * BRIEF MODULE DESCRIPTION + * Driver for AMD Au1000 MIPS Processor, AC'97 Sound Port + * + * Copyright 2004 Cooper Street Innovations Inc. + * Author: Charles Eidsness <charles@cooper-street.com> + * + * 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. + * + * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED + * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF + * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN + * NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, + * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT + * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF + * USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON + * ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT + * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF + * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. + * + * 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., + * 675 Mass Ave, Cambridge, MA 02139, USA. + * + * History: + * + * 2004-09-09 Charles Eidsness -- Original verion -- based on + * sa11xx-uda1341.c ALSA driver and the + * au1000.c OSS driver. + * 2004-09-09 Matt Porter -- Added support for ALSA 1.0.6 + * + */ + +#include <linux/ioport.h> +#include <linux/interrupt.h> +#include <sound/driver.h> +#include <linux/init.h> +#include <linux/slab.h> +#include <linux/version.h> +#include <sound/core.h> +#include <sound/initval.h> +#include <sound/pcm.h> +#include <sound/ac97_codec.h> +#include <asm/mach-au1x00/au1000.h> +#include <asm/mach-au1x00/au1000_dma.h> + +MODULE_AUTHOR("Charles Eidsness <charles@cooper-street.com>"); +MODULE_DESCRIPTION("Au1000 AC'97 ALSA Driver"); +MODULE_LICENSE("GPL"); +#if LINUX_VERSION_CODE > KERNEL_VERSION(2,6,8) +MODULE_SUPPORTED_DEVICE("{{AMD,Au1000 AC'97}}"); +#else +MODULE_CLASSES("{sound}"); +MODULE_DEVICES("{{AMD,Au1000 AC'97}}"); +#endif + +#define chip_t au1000_t + +#define PLAYBACK 0 +#define CAPTURE 1 +#define AC97_SLOT_3 0x01 +#define AC97_SLOT_4 0x02 +#define AC97_SLOT_6 0x08 +#define AC97_CMD_IRQ 31 +#define READ 0 +#define WRITE 1 +#define READ_WAIT 2 +#define RW_DONE 3 + +DECLARE_WAIT_QUEUE_HEAD(ac97_command_wq); + +typedef struct au1000_period au1000_period_t; +struct au1000_period +{ + u32 start; + u32 relative_end; /*realtive to start of buffer*/ + au1000_period_t * next; +}; + +/*Au1000 AC97 Port Control Reisters*/ +typedef struct au1000_ac97_reg au1000_ac97_reg_t; +struct au1000_ac97_reg { + u32 volatile config; + u32 volatile status; + u32 volatile data; + u32 volatile cmd; + u32 volatile cntrl; +}; + +typedef struct audio_stream audio_stream_t; +struct audio_stream { + snd_pcm_substream_t * substream; + int dma; + spinlock_t dma_lock; + au1000_period_t * buffer; + unsigned long period_size; +}; + +typedef struct snd_card_au1000 { + snd_card_t *card; + au1000_ac97_reg_t volatile *ac97_ioport; + + struct resource *ac97_res_port; + spinlock_t ac97_lock; + ac97_t *ac97; + + snd_pcm_t *pcm; + audio_stream_t *stream[2]; /* playback & capture */ +} au1000_t; + +static au1000_t *au1000 = NULL; + +/*--------------------------- Local Functions --------------------------------*/ +static void +au1000_set_ac97_xmit_slots(long xmit_slots) +{ + u32 volatile ac97_config; + + spin_lock(&au1000->ac97_lock); + ac97_config = au1000->ac97_ioport->config; + ac97_config = ac97_config & ~AC97C_XMIT_SLOTS_MASK; + ac97_config |= (xmit_slots << AC97C_XMIT_SLOTS_BIT); + au1000->ac97_ioport->config = ac97_config; + spin_unlock(&au1000->ac97_lock); +} + +static void +au1000_set_ac97_recv_slots(long recv_slots) +{ + u32 volatile ac97_config; + + spin_lock(&au1000->ac97_lock); + ac97_config = au1000->ac97_ioport->config; + ac97_config = ac97_config & ~AC97C_RECV_SLOTS_MASK; + ac97_config |= (recv_slots << AC97C_RECV_SLOTS_BIT); + au1000->ac97_ioport->config = ac97_config; + spin_unlock(&au1000->ac97_lock); +} + + +static void +au1000_dma_stop(audio_stream_t *stream) +{ + unsigned long flags; + au1000_period_t * pointer; + au1000_period_t * pointer_next; + + if (stream->buffer != NULL) { + spin_lock_irqsave(&stream->dma_lock, flags); + disable_dma(stream->dma); + spin_unlock_irqrestore(&stream->dma_lock, flags); + + pointer = stream->buffer; + pointer_next = stream->buffer->next; + + do { + kfree(pointer); + pointer = pointer_next; + pointer_next = pointer->next; + } while (pointer != stream->buffer); + + stream->buffer = NULL; + } +} + +static void +au1000_dma_start(audio_stream_t *stream) +{ + snd_pcm_substream_t *substream = stream->substream; + snd_pcm_runtime_t *runtime = substream->runtime; + + unsigned long flags, dma_start; + int i; + au1000_period_t * pointer; + + if (stream->buffer == NULL) { + dma_start = virt_to_phys(runtime->dma_area); + + stream->period_size = frames_to_bytes(runtime, + runtime->period_size); + stream->buffer = kmalloc(sizeof(au1000_period_t), GFP_KERNEL); + pointer = stream->buffer; + for (i = 0 ; i < runtime->periods ; i++) { + pointer->start = (u32)(dma_start + + (i * stream->period_size)); + pointer->relative_end = (u32) + (((i+1) * stream->period_size) - 0x1); + if ( i < runtime->periods - 1) { + pointer->next = kmalloc(sizeof(au1000_period_t) + , GFP_KERNEL); + pointer = pointer->next; + } + } + pointer->next = stream->buffer; + + spin_lock_irqsave(&stream->dma_lock, flags); + init_dma(stream->dma); + if (get_dma_active_buffer(stream->dma) == 0) { + clear_dma_done0(stream->dma); + set_dma_addr0(stream->dma, stream->buffer->start); + set_dma_count0(stream->dma, stream->period_size >> 1); + set_dma_addr1(stream->dma, stream->buffer->next->start); + set_dma_count1(stream->dma, stream->period_size >> 1); + } else { + clear_dma_done1(stream->dma); + set_dma_addr1(stream->dma, stream->buffer->start); + set_dma_count1(stream->dma, stream->period_size >> 1); + set_dma_addr0(stream->dma, stream->buffer->next->start); + set_dma_count0(stream->dma, stream->period_size >> 1); + } + enable_dma_buffers(stream->dma); + start_dma(stream->dma); + spin_unlock_irqrestore(&stream->dma_lock, flags); + } +} + +static irqreturn_t +au1000_dma_interrupt(int irq, void *dev_id, struct pt_regs *regs) +{ + audio_stream_t *stream = (audio_stream_t *) dev_id; + snd_pcm_substream_t *substream = stream->substream; + + spin_lock(&stream->dma_lock); + switch (get_dma_buffer_done(stream->dma)) { + case DMA_D0: + stream->buffer = stream->buffer->next; + clear_dma_done0(stream->dma); + set_dma_addr0(stream->dma, stream->buffer->next->start); + set_dma_count0(stream->dma, stream->period_size >> 1); + enable_dma_buffer0(stream->dma); + break; + case DMA_D1: + stream->buffer = stream->buffer->next; + clear_dma_done1(stream->dma); + set_dma_addr1(stream->dma, stream->buffer->next->start); + set_dma_count1(stream->dma, stream->period_size >> 1); + enable_dma_buffer1(stream->dma); + break; + case (DMA_D0 | DMA_D1): + spin_unlock(&stream->dma_lock); + printk(KERN_ERR "DMA %d missed interrupt.\n",stream->dma); + au1000_dma_stop(stream); + au1000_dma_start(stream); + spin_lock(&stream->dma_lock); + break; + case (~DMA_D0 & ~DMA_D1): + printk(KERN_ERR "DMA %d empty irq.\n",stream->dma); + } + spin_unlock(&stream->dma_lock); + snd_pcm_period_elapsed(substream); + return IRQ_HANDLED; +} + +/*-------------------------- PCM Audio Streams -------------------------------*/ + +static unsigned int rates[] = {8000, 11025, 16000, 22050}; +static snd_pcm_hw_constraint_list_t hw_constraints_rates = { + .count = sizeof(rates) / sizeof(rates[0]), + .list = rates, + .mask = 0, +}; + +static snd_pcm_hardware_t snd_au1000 = +{ + .info = (SNDRV_PCM_INFO_INTERLEAVED | \ + SNDRV_PCM_INFO_MMAP | SNDRV_PCM_INFO_MMAP_VALID), + .formats = SNDRV_PCM_FMTBIT_S16_LE, + .rates = (SNDRV_PCM_RATE_8000 | SNDRV_PCM_RATE_11025 | + SNDRV_PCM_RATE_16000 | SNDRV_PCM_RATE_22050), + .rate_min = 8000, + .rate_max = 22050, + .channels_min = 1, + .channels_max = 2, + .buffer_bytes_max = 128*1024, + .period_bytes_min = 32, + .period_bytes_max = 16*1024, + .periods_min = 8, + .periods_max = 255, + .fifo_size = 16, +}; + +static int +snd_au1000_playback_open(snd_pcm_substream_t * substream) +{ + au1000->stream[PLAYBACK]->substream = substream; + au1000->stream[PLAYBACK]->buffer = NULL; + substream->private_data = au1000->stream[PLAYBACK]; + substream->runtime->hw = snd_au1000; + return (snd_pcm_hw_constraint_list(substream->runtime, 0, + SNDRV_PCM_HW_PARAM_RATE, &hw_constraints_rates) < 0); +} + +static int +snd_au1000_capture_open(snd_pcm_substream_t * substream) +{ + au1000->stream[CAPTURE]->substream = substream; + au1000->stream[CAPTURE]->buffer = NULL; + substream->private_data = au1000->stream[CAPTURE]; + substream->runtime->hw = snd_au1000; + return (snd_pcm_hw_constraint_list(substream->runtime, 0, + SNDRV_PCM_HW_PARAM_RATE, &hw_constraints_rates) < 0); + +} + +static int +snd_au1000_playback_close(snd_pcm_substream_t * substream) +{ + au1000->stream[PLAYBACK]->substream = NULL; + return 0; +} + +static int +snd_au1000_capture_close(snd_pcm_substream_t * substream) +{ + au1000->stream[CAPTURE]->substream = NULL; + return 0; +} + +static int +snd_au1000_hw_params(snd_pcm_substream_t * substream, + snd_pcm_hw_params_t * hw_params) +{ + return snd_pcm_lib_malloc_pages(substream, + params_buffer_bytes(hw_params)); +} + +static int +snd_au1000_hw_free(snd_pcm_substream_t * substream) +{ + return snd_pcm_lib_free_pages(substream); +} + +static int +snd_au1000_playback_prepare(snd_pcm_substream_t * substream) +{ + snd_pcm_runtime_t *runtime = substream->runtime; + + if (runtime->channels == 1 ) + au1000_set_ac97_xmit_slots(AC97_SLOT_4); + else + au1000_set_ac97_xmit_slots(AC97_SLOT_3 | AC97_SLOT_4); + snd_ac97_set_rate(au1000->ac97, AC97_PCM_FRONT_DAC_RATE, runtime->rate); + return 0; +} + +static int +snd_au1000_capture_prepare(snd_pcm_substream_t * substream) +{ + snd_pcm_runtime_t *runtime = substream->runtime; + + if (runtime->channels == 1 ) + au1000_set_ac97_recv_slots(AC97_SLOT_4); + else + au1000_set_ac97_recv_slots(AC97_SLOT_3 | AC97_SLOT_4); + snd_ac97_set_rate(au1000->ac97, AC97_PCM_LR_ADC_RATE, runtime->rate); + return 0; +} + +static int +snd_au1000_trigger(snd_pcm_substream_t * substream, int cmd) +{ + audio_stream_t *stream = substream->private_data; + int err = 0; + + switch (cmd) { + case SNDRV_PCM_TRIGGER_START: + au1000_dma_start(stream); + break; + case SNDRV_PCM_TRIGGER_STOP: + au1000_dma_stop(stream); + break; + default: + err = -EINVAL; + break; + } + return err; +} + +static snd_pcm_uframes_t +snd_au1000_pointer(snd_pcm_substream_t * substream) +{ + audio_stream_t *stream = substream->private_data; + snd_pcm_runtime_t *runtime = substream->runtime; + unsigned long flags; + long location; + + spin_lock_irqsave(&stream->dma_lock, flags); + location = get_dma_residue(stream->dma); + spin_unlock_irqrestore(&stream->dma_lock, flags); + location = stream->buffer->relative_end - location; + if (location == -1) + location = 0; + return bytes_to_frames(runtime,location); +} + +static snd_pcm_ops_t snd_card_au1000_playback_ops = { + .open = snd_au1000_playback_open, + .close = snd_au1000_playback_close, + .ioctl = snd_pcm_lib_ioctl, + .hw_params = snd_au1000_hw_params, + .hw_free = snd_au1000_hw_free, + .prepare = snd_au1000_playback_prepare, + .trigger = snd_au1000_trigger, + .pointer = snd_au1000_pointer, +}; + +static snd_pcm_ops_t snd_card_au1000_capture_ops = { + .open = snd_au1000_capture_open, + .close = snd_au1000_capture_close, + .ioctl = snd_pcm_lib_ioctl, + .hw_params = snd_au1000_hw_params, + .hw_free = snd_au1000_hw_free, + .prepare = snd_au1000_capture_prepare, + .trigger = snd_au1000_trigger, + .pointer = snd_au1000_pointer, +}; + +static int __devinit +snd_au1000_pcm_new(void) +{ + snd_pcm_t *pcm; + int err; + unsigned long flags; + + if ((err = snd_pcm_new(au1000->card, "AU1000 AC97 PCM", 0, 1, 1, &pcm)) < 0) + return err; + + snd_pcm_lib_preallocate_pages_for_all(pcm, SNDRV_DMA_TYPE_CONTINUOUS, + snd_dma_continuous_data(GFP_KERNEL), 128*1024, 128*1024); + + snd_pcm_set_ops(pcm, SNDRV_PCM_STREAM_PLAYBACK, + &snd_card_au1000_playback_ops); + snd_pcm_set_ops(pcm, SNDRV_PCM_STREAM_CAPTURE, + &snd_card_au1000_capture_ops); + + pcm->private_data = au1000; + pcm->info_flags = 0; + strcpy(pcm->name, "Au1000 AC97 PCM"); + + flags = claim_dma_lock(); + if ((au1000->stream[PLAYBACK]->dma = request_au1000_dma(DMA_ID_AC97C_TX, + "AC97 TX", au1000_dma_interrupt, SA_INTERRUPT, + au1000->stream[PLAYBACK])) < 0) { + release_dma_lock(flags); + return -EBUSY; + } + if ((au1000->stream[CAPTURE]->dma = request_au1000_dma(DMA_ID_AC97C_RX, + "AC97 RX", au1000_dma_interrupt, SA_INTERRUPT, + au1000->stream[CAPTURE])) < 0){ + release_dma_lock(flags); + return -EBUSY; + } + /* enable DMA coherency in read/write DMA channels */ + set_dma_mode(au1000->stream[PLAYBACK]->dma, + get_dma_mode(au1000->stream[PLAYBACK]->dma) & ~DMA_NC); + set_dma_mode(au1000->stream[CAPTURE]->dma, + get_dma_mode(au1000->stream[CAPTURE]->dma) & ~DMA_NC); + release_dma_lock(flags); + spin_lock_init(&au1000->stream[PLAYBACK]->dma_lock); + spin_lock_init(&au1000->stream[CAPTURE]->dma_lock); + au1000->pcm = pcm; + return 0; +} + + +/*-------------------------- AC97 CODEC Control ------------------------------*/ + +static unsigned short +snd_au1000_ac97_read(ac97_t *ac97, unsigned short reg) +{ + u32 volatile cmd; + u16 volatile data; + int i; + spin_lock(au1000->ac97_lock); +/* would rather use the interupt than this polling but it works and I can't +get the interupt driven case to work efficiently */ + for (i = 0; i < 0x5000; i++) + if (!(au1000->ac97_ioport->status & AC97C_CP)) + break; + if (i == 0x5000) + printk(KERN_ERR "au1000 AC97: AC97 command read timeout\n"); + + cmd = (u32) reg & AC97C_INDEX_MASK; + cmd |= AC97C_READ; + au1000->ac97_ioport->cmd = cmd; + + /* now wait for the data */ + for (i = 0; i < 0x5000; i++) + if (!(au1000->ac97_ioport->status & AC97C_CP)) + break; + if (i == 0x5000) { + printk(KERN_ERR "au1000 AC97: AC97 command read timeout\n"); + return 0; + } + + data = au1000->ac97_ioport->cmd & 0xffff; + spin_unlock(au1000->ac97_lock); + + return data; + +} + + +static void +snd_au1000_ac97_write(ac97_t *ac97, unsigned short reg, unsigned short val) +{ + u32 cmd; + int i; + spin_lock(au1000->ac97_lock); +/* would rather use the interupt than this polling but it works and I can't +get the interupt driven case to work efficiently */ + for (i = 0; i < 0x5000; i++) + if (!(au1000->ac97_ioport->status & AC97C_CP)) + break; + if (i == 0x5000) + printk(KERN_ERR "au1000 AC97: AC97 command write timeout\n"); + + cmd = (u32) reg & AC97C_INDEX_MASK; + cmd &= ~AC97C_READ; + cmd |= ((u32) val << AC97C_WD_BIT); + au1000->ac97_ioport->cmd = cmd; + spin_unlock(au1000->ac97_lock); +} +static void +snd_au1000_ac97_free(ac97_t *ac97) +{ + au1000->ac97 = NULL; +} + +static int __devinit +snd_au1000_ac97_new(void) +{ + int err; + +#if LINUX_VERSION_CODE > KERNEL_VERSION(2,6,8) + ac97_bus_t *pbus; + ac97_template_t ac97; + static ac97_bus_ops_t ops = { + .write = snd_au1000_ac97_write, + .read = snd_au1000_ac97_read, + }; +#else + ac97_bus_t bus, *pbus; + ac97_t ac97; +#endif + + if ((au1000->ac97_res_port = request_region(AC97C_CONFIG, + sizeof(au1000_ac97_reg_t), "Au1x00 AC97")) == NULL) { + snd_printk(KERN_ERR "ALSA AC97: can't grap AC97 port\n"); + return -EBUSY; + } + au1000->ac97_ioport = (au1000_ac97_reg_t *) au1000->ac97_res_port->start; + + spin_lock_init(&au1000->ac97_lock); + + spin_lock(&au1000->ac97_lock); + + /* configure pins for AC'97 + TODO: move to board_setup.c */ + au_writel(au_readl(SYS_PINFUNC) & ~0x02, SYS_PINFUNC); + + /* Initialise Au1000's AC'97 Control Block */ + au1000->ac97_ioport->cntrl = AC97C_RS | AC97C_CE; + udelay(10); + au1000->ac97_ioport->cntrl = AC97C_CE; + udelay(10); + + /* Initialise External CODEC -- cold reset */ + au1000->ac97_ioport->config = AC97C_RESET; + udelay(10); + au1000->ac97_ioport->config = 0x0; + mdelay(5); + + spin_unlock(&au1000->ac97_lock); + + /* Initialise AC97 middle-layer */ +#if LINUX_VERSION_CODE > KERNEL_VERSION(2,6,8) + if ((err = snd_ac97_bus(au1000->card, 0, &ops, au1000, &pbus)) < 0) + return err; +#else + memset(&bus, 0, sizeof(bus)); + bus.write = snd_au1000_ac97_write; + bus.read = snd_au1000_ac97_read; + if ((err = snd_ac97_bus(au1000->card, &bus, &pbus)) < 0) + return err; +#endif + memset(&ac97, 0, sizeof(ac97)); + ac97.private_data = au1000; + ac97.private_free = snd_au1000_ac97_free; + if ((err = snd_ac97_mixer(pbus, &ac97, &au1000->ac97)) < 0) + return err; + return 0; + +} + +/*------------------------------ Setup / Destroy ----------------------------*/ + +void +snd_au1000_free(snd_card_t *card) +{ + + if (au1000->ac97_res_port) { + /* put internal AC97 block into reset */ + au1000->ac97_ioport->cntrl = AC97C_RS; + au1000->ac97_ioport = NULL; + release_resource(au1000->ac97_res_port); + kfree_nocheck(au1000->ac97_res_port); + } + + if (au1000->stream[PLAYBACK]->dma >= 0) + free_au1000_dma(au1000->stream[PLAYBACK]->dma); + + if (au1000->stream[CAPTURE]->dma >= 0) + free_au1000_dma(au1000->stream[CAPTURE]->dma); + + kfree(au1000->stream[PLAYBACK]); + au1000->stream[PLAYBACK] = NULL; + kfree(au1000->stream[CAPTURE]); + au1000->stream[CAPTURE] = NULL; + kfree(au1000); + au1000 = NULL; + +} + +static int __init +au1000_init(void) +{ + int err; + + au1000 = kmalloc(sizeof(au1000_t), GFP_KERNEL); + if (au1000 == NULL) + return -ENOMEM; + au1000->stream[PLAYBACK] = kmalloc(sizeof(audio_stream_t), GFP_KERNEL); + if (au1000->stream[PLAYBACK] == NULL) + return -ENOMEM; + au1000->stream[CAPTURE] = kmalloc(sizeof(audio_stream_t), GFP_KERNEL); + if (au1000->stream[CAPTURE] == NULL) + return -ENOMEM; + /* so that snd_au1000_free will work as intended */ + au1000->stream[PLAYBACK]->dma = -1; + au1000->stream[CAPTURE]->dma = -1; + au1000->ac97_res_port = NULL; + + au1000->card = snd_card_new(-1, "AC97", THIS_MODULE, sizeof(au1000_t)); + if (au1000->card == NULL) { + snd_au1000_free(au1000->card); + return -ENOMEM; + } + + au1000->card->private_data = (au1000_t *)au1000; + au1000->card->private_free = snd_au1000_free; + + if ((err = snd_au1000_ac97_new()) < 0 ) { + snd_card_free(au1000->card); + return err; + } + + if ((err = snd_au1000_pcm_new()) < 0) { + snd_card_free(au1000->card); + return err; + } + + strcpy(au1000->card->driver, "AMD-Au1000-AC97"); + strcpy(au1000->card->shortname, "Au1000-AC97"); + sprintf(au1000->card->longname, "AMD Au1000--AC97 ALSA Driver"); + + if ((err = snd_card_register(au1000->card)) < 0) { + snd_card_free(au1000->card); + return err; + } + + printk( KERN_INFO "ALSA AC97: Driver Initialized\n" ); + return 0; +} + +static void __exit au1000_exit(void) +{ + snd_card_free(au1000->card); +} + +module_init(au1000_init); +module_exit(au1000_exit); + |
