diff options
Diffstat (limited to 'sound/oss/au1550_ac97.c')
| -rw-r--r-- | sound/oss/au1550_ac97.c | 2119 |
1 files changed, 2119 insertions, 0 deletions
diff --git a/sound/oss/au1550_ac97.c b/sound/oss/au1550_ac97.c new file mode 100644 index 000000000000..a78e48d412d2 --- /dev/null +++ b/sound/oss/au1550_ac97.c @@ -0,0 +1,2119 @@ +/* + * au1550_ac97.c -- Sound driver for Alchemy Au1550 MIPS Internet Edge + * Processor. + * + * Copyright 2004 Embedded Edge, LLC + * dan@embeddededge.com + * + * Mostly copied from the au1000.c driver and some from the + * PowerMac dbdma driver. + * We assume the processor can do memory coherent DMA. + * + * Ported to 2.6 by Matt Porter <mporter@kernel.crashing.org> + * + * 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. + * + */ + +#undef DEBUG + +#include <linux/version.h> +#include <linux/module.h> +#include <linux/string.h> +#include <linux/ioport.h> +#include <linux/sched.h> +#include <linux/delay.h> +#include <linux/sound.h> +#include <linux/slab.h> +#include <linux/soundcard.h> +#include <linux/init.h> +#include <linux/interrupt.h> +#include <linux/kernel.h> +#include <linux/poll.h> +#include <linux/pci.h> +#include <linux/bitops.h> +#include <linux/spinlock.h> +#include <linux/smp_lock.h> +#include <linux/ac97_codec.h> +#include <asm/io.h> +#include <asm/uaccess.h> +#include <asm/hardirq.h> +#include <asm/mach-au1x00/au1000.h> +#include <asm/mach-au1x00/au1xxx_psc.h> +#include <asm/mach-au1x00/au1xxx_dbdma.h> + +#undef OSS_DOCUMENTED_MIXER_SEMANTICS + +/* misc stuff */ +#define POLL_COUNT 0x50000 +#define AC97_EXT_DACS (AC97_EXTID_SDAC | AC97_EXTID_CDAC | AC97_EXTID_LDAC) + +/* The number of DBDMA ring descriptors to allocate. No sense making + * this too large....if you can't keep up with a few you aren't likely + * to be able to with lots of them, either. + */ +#define NUM_DBDMA_DESCRIPTORS 4 + +#define err(format, arg...) printk(KERN_ERR format "\n" , ## arg) + +/* Boot options + * 0 = no VRA, 1 = use VRA if codec supports it + */ +static int vra = 1; +MODULE_PARM(vra, "i"); +MODULE_PARM_DESC(vra, "if 1 use VRA if codec supports it"); + +static struct au1550_state { + /* soundcore stuff */ + int dev_audio; + + struct ac97_codec *codec; + unsigned codec_base_caps; /* AC'97 reg 00h, "Reset Register" */ + unsigned codec_ext_caps; /* AC'97 reg 28h, "Extended Audio ID" */ + int no_vra; /* do not use VRA */ + + spinlock_t lock; + struct semaphore open_sem; + struct semaphore sem; + mode_t open_mode; + wait_queue_head_t open_wait; + + struct dmabuf { + u32 dmanr; + unsigned sample_rate; + unsigned src_factor; + unsigned sample_size; + int num_channels; + int dma_bytes_per_sample; + int user_bytes_per_sample; + int cnt_factor; + + void *rawbuf; + unsigned buforder; + unsigned numfrag; + unsigned fragshift; + void *nextIn; + void *nextOut; + int count; + unsigned total_bytes; + unsigned error; + wait_queue_head_t wait; + + /* redundant, but makes calculations easier */ + unsigned fragsize; + unsigned dma_fragsize; + unsigned dmasize; + unsigned dma_qcount; + + /* OSS stuff */ + unsigned mapped:1; + unsigned ready:1; + unsigned stopped:1; + unsigned ossfragshift; + int ossmaxfrags; + unsigned subdivision; + } dma_dac, dma_adc; +} au1550_state; + +static unsigned +ld2(unsigned int x) +{ + unsigned r = 0; + + if (x >= 0x10000) { + x >>= 16; + r += 16; + } + if (x >= 0x100) { + x >>= 8; + r += 8; + } + if (x >= 0x10) { + x >>= 4; + r += 4; + } + if (x >= 4) { + x >>= 2; + r += 2; + } + if (x >= 2) + r++; + return r; +} + +static void +au1550_delay(int msec) +{ + unsigned long tmo; + signed long tmo2; + + if (in_interrupt()) + return; + + tmo = jiffies + (msec * HZ) / 1000; + for (;;) { + tmo2 = tmo - jiffies; + if (tmo2 <= 0) + break; + schedule_timeout(tmo2); + } +} + +static u16 +rdcodec(struct ac97_codec *codec, u8 addr) +{ + struct au1550_state *s = (struct au1550_state *)codec->private_data; + unsigned long flags; + u32 cmd, val; + u16 data; + int i; + + spin_lock_irqsave(&s->lock, flags); + + for (i = 0; i < POLL_COUNT; i++) { + val = au_readl(PSC_AC97STAT); + au_sync(); + if (!(val & PSC_AC97STAT_CP)) + break; + } + if (i == POLL_COUNT) + err("rdcodec: codec cmd pending expired!"); + + cmd = (u32)PSC_AC97CDC_INDX(addr); + cmd |= PSC_AC97CDC_RD; /* read command */ + au_writel(cmd, PSC_AC97CDC); + au_sync(); + + /* now wait for the data + */ + for (i = 0; i < POLL_COUNT; i++) { + val = au_readl(PSC_AC97STAT); + au_sync(); + if (!(val & PSC_AC97STAT_CP)) + break; + } + if (i == POLL_COUNT) { + err("rdcodec: read poll expired!"); + return 0; + } + + /* wait for command done? + */ + for (i = 0; i < POLL_COUNT; i++) { + val = au_readl(PSC_AC97EVNT); + au_sync(); + if (val & PSC_AC97EVNT_CD) + break; + } + if (i == POLL_COUNT) { + err("rdcodec: read cmdwait expired!"); + return 0; + } + + data = au_readl(PSC_AC97CDC) & 0xffff; + au_sync(); + + /* Clear command done event. + */ + au_writel(PSC_AC97EVNT_CD, PSC_AC97EVNT); + au_sync(); + + spin_unlock_irqrestore(&s->lock, flags); + + return data; +} + + +static void +wrcodec(struct ac97_codec *codec, u8 addr, u16 data) +{ + struct au1550_state *s = (struct au1550_state *)codec->private_data; + unsigned long flags; + u32 cmd, val; + int i; + + spin_lock_irqsave(&s->lock, flags); + + for (i = 0; i < POLL_COUNT; i++) { + val = au_readl(PSC_AC97STAT); + au_sync(); + if (!(val & PSC_AC97STAT_CP)) + break; + } + if (i == POLL_COUNT) + err("wrcodec: codec cmd pending expired!"); + + cmd = (u32)PSC_AC97CDC_INDX(addr); + cmd |= (u32)data; + au_writel(cmd, PSC_AC97CDC); + au_sync(); + + for (i = 0; i < POLL_COUNT; i++) { + val = au_readl(PSC_AC97STAT); + au_sync(); + if (!(val & PSC_AC97STAT_CP)) + break; + } + if (i == POLL_COUNT) + err("wrcodec: codec cmd pending expired!"); + + for (i = 0; i < POLL_COUNT; i++) { + val = au_readl(PSC_AC97EVNT); + au_sync(); + if (val & PSC_AC97EVNT_CD) + break; + } + if (i == POLL_COUNT) + err("wrcodec: read cmdwait expired!"); + + /* Clear command done event. + */ + au_writel(PSC_AC97EVNT_CD, PSC_AC97EVNT); + au_sync(); + + spin_unlock_irqrestore(&s->lock, flags); +} + +static void +waitcodec(struct ac97_codec *codec) +{ + u16 temp; + u32 val; + int i; + + /* codec_wait is used to wait for a ready state after + * an AC97C_RESET. + */ + au1550_delay(10); + + /* first poll the CODEC_READY tag bit + */ + for (i = 0; i < POLL_COUNT; i++) { + val = au_readl(PSC_AC97STAT); + au_sync(); + if (val & PSC_AC97STAT_CR) + break; + } + if (i == POLL_COUNT) { + err("waitcodec: CODEC_READY poll expired!"); + return; + } + + /* get AC'97 powerdown control/status register + */ + temp = rdcodec(codec, AC97_POWER_CONTROL); + + /* If anything is powered down, power'em up + */ + if (temp & 0x7f00) { + /* Power on + */ + wrcodec(codec, AC97_POWER_CONTROL, 0); + au1550_delay(100); + + /* Reread + */ + temp = rdcodec(codec, AC97_POWER_CONTROL); + } + + /* Check if Codec REF,ANL,DAC,ADC ready + */ + if ((temp & 0x7f0f) != 0x000f) + err("codec reg 26 status (0x%x) not ready!!", temp); +} + +/* stop the ADC before calling */ +static void +set_adc_rate(struct au1550_state *s, unsigned rate) +{ + struct dmabuf *adc = &s->dma_adc; + struct dmabuf *dac = &s->dma_dac; + unsigned adc_rate, dac_rate; + u16 ac97_extstat; + + if (s->no_vra) { + /* calc SRC factor + */ + adc->src_factor = ((96000 / rate) + 1) >> 1; + adc->sample_rate = 48000 / adc->src_factor; + return; + } + + adc->src_factor = 1; + + ac97_extstat = rdcodec(s->codec, AC97_EXTENDED_STATUS); + + rate = rate > 48000 ? 48000 : rate; + + /* enable VRA + */ + wrcodec(s->codec, AC97_EXTENDED_STATUS, + ac97_extstat | AC97_EXTSTAT_VRA); + + /* now write the sample rate + */ + wrcodec(s->codec, AC97_PCM_LR_ADC_RATE, (u16) rate); + + /* read it back for actual supported rate + */ + adc_rate = rdcodec(s->codec, AC97_PCM_LR_ADC_RATE); + + pr_debug("set_adc_rate: set to %d Hz\n", adc_rate); + + /* some codec's don't allow unequal DAC and ADC rates, in which case + * writing one rate reg actually changes both. + */ + dac_rate = rdcodec(s->codec, AC97_PCM_FRONT_DAC_RATE); + if (dac->num_channels > 2) + wrcodec(s->codec, AC97_PCM_SURR_DAC_RATE, dac_rate); + if (dac->num_channels > 4) + wrcodec(s->codec, AC97_PCM_LFE_DAC_RATE, dac_rate); + + adc->sample_rate = adc_rate; + dac->sample_rate = dac_rate; +} + +/* stop the DAC before calling */ +static void +set_dac_rate(struct au1550_state *s, unsigned rate) +{ + struct dmabuf *dac = &s->dma_dac; + struct dmabuf *adc = &s->dma_adc; + unsigned adc_rate, dac_rate; + u16 ac97_extstat; + + if (s->no_vra) { + /* calc SRC factor + */ + dac->src_factor = ((96000 / rate) + 1) >> 1; + dac->sample_rate = 48000 / dac->src_factor; + return; + } + + dac->src_factor = 1; + + ac97_extstat = rdcodec(s->codec, AC97_EXTENDED_STATUS); + + rate = rate > 48000 ? 48000 : rate; + + /* enable VRA + */ + wrcodec(s->codec, AC97_EXTENDED_STATUS, + ac97_extstat | AC97_EXTSTAT_VRA); + + /* now write the sample rate + */ + wrcodec(s->codec, AC97_PCM_FRONT_DAC_RATE, (u16) rate); + + /* I don't support different sample rates for multichannel, + * so make these channels the same. + */ + if (dac->num_channels > 2) + wrcodec(s->codec, AC97_PCM_SURR_DAC_RATE, (u16) rate); + if (dac->num_channels > 4) + wrcodec(s->codec, AC97_PCM_LFE_DAC_RATE, (u16) rate); + /* read it back for actual supported rate + */ + dac_rate = rdcodec(s->codec, AC97_PCM_FRONT_DAC_RATE); + + pr_debug("set_dac_rate: set to %d Hz\n", dac_rate); + + /* some codec's don't allow unequal DAC and ADC rates, in which case + * writing one rate reg actually changes both. + */ + adc_rate = rdcodec(s->codec, AC97_PCM_LR_ADC_RATE); + + dac->sample_rate = dac_rate; + adc->sample_rate = adc_rate; +} + +static void +stop_dac(struct au1550_state *s) +{ + struct dmabuf *db = &s->dma_dac; + u32 stat; + unsigned long flags; + + if (db->stopped) + return; + + spin_lock_irqsave(&s->lock, flags); + + au_writel(PSC_AC97PCR_TP, PSC_AC97PCR); + au_sync(); + + /* Wait for Transmit Busy to show disabled. + */ + do { + stat = readl((void *)PSC_AC97STAT); + au_sync(); + } while ((stat & PSC_AC97STAT_TB) != 0); + + au1xxx_dbdma_reset(db->dmanr); + + db->stopped = 1; + + spin_unlock_irqrestore(&s->lock, flags); +} + +static void +stop_adc(struct au1550_state *s) +{ + struct dmabuf *db = &s->dma_adc; + unsigned long flags; + u32 stat; + + if (db->stopped) + return; + + spin_lock_irqsave(&s->lock, flags); + + au_writel(PSC_AC97PCR_RP, PSC_AC97PCR); + au_sync(); + + /* Wait for Receive Busy to show disabled. + */ + do { + stat = readl((void *)PSC_AC97STAT); + au_sync(); + } while ((stat & PSC_AC97STAT_RB) != 0); + + au1xxx_dbdma_reset(db->dmanr); + + db->stopped = 1; + + spin_unlock_irqrestore(&s->lock, flags); +} + + +static void +set_xmit_slots(int num_channels) +{ + u32 ac97_config, stat; + + ac97_config = au_readl(PSC_AC97CFG); + au_sync(); + ac97_config &= ~(PSC_AC97CFG_TXSLOT_MASK | PSC_AC97CFG_DE_ENABLE); + au_writel(ac97_config, PSC_AC97CFG); + au_sync(); + + switch (num_channels) { + case 6: /* stereo with surround and center/LFE, + * slots 3,4,6,7,8,9 + */ + ac97_config |= PSC_AC97CFG_TXSLOT_ENA(6); + ac97_config |= PSC_AC97CFG_TXSLOT_ENA(9); + + case 4: /* stereo with surround, slots 3,4,7,8 */ + ac97_config |= PSC_AC97CFG_TXSLOT_ENA(7); + ac97_config |= PSC_AC97CFG_TXSLOT_ENA(8); + + case 2: /* stereo, slots 3,4 */ + case 1: /* mono */ + ac97_config |= PSC_AC97CFG_TXSLOT_ENA(3); + ac97_config |= PSC_AC97CFG_TXSLOT_ENA(4); + } + + au_writel(ac97_config, PSC_AC97CFG); + au_sync(); + + ac97_config |= PSC_AC97CFG_DE_ENABLE; + au_writel(ac97_config, PSC_AC97CFG); + au_sync(); + + /* Wait for Device ready. + */ + do { + stat = readl((void *)PSC_AC97STAT); + au_sync(); + } while ((stat & PSC_AC97STAT_DR) == 0); +} + +static void +set_recv_slots(int num_channels) +{ + u32 ac97_config, stat; + + ac97_config = au_readl(PSC_AC97CFG); + au_sync(); + ac97_config &= ~(PSC_AC97CFG_RXSLOT_MASK | PSC_AC97CFG_DE_ENABLE); + au_writel(ac97_config, PSC_AC97CFG); + au_sync(); + + /* Always enable slots 3 and 4 (stereo). Slot 6 is + * optional Mic ADC, which we don't support yet. + */ + ac97_config |= PSC_AC97CFG_RXSLOT_ENA(3); + ac97_config |= PSC_AC97CFG_RXSLOT_ENA(4); + + au_writel(ac97_config, PSC_AC97CFG); + au_sync(); + + ac97_config |= PSC_AC97CFG_DE_ENABLE; + au_writel(ac97_config, PSC_AC97CFG); + au_sync(); + + /* Wait for Device ready. + */ + do { + stat = readl((void *)PSC_AC97STAT); + au_sync(); + } while ((stat & PSC_AC97STAT_DR) == 0); +} + +static void +start_dac(struct au1550_state *s) +{ + struct dmabuf *db = &s->dma_dac; + unsigned long flags; + + if (!db->stopped) + return; + + spin_lock_irqsave(&s->lock, flags); + + set_xmit_slots(db->num_channels); + au_writel(PSC_AC97PCR_TC, PSC_AC97PCR); + au_sync(); + au_writel(PSC_AC97PCR_TS, PSC_AC97PCR); + au_sync(); + + au1xxx_dbdma_start(db->dmanr); + + db->stopped = 0; + + spin_unlock_irqrestore(&s->lock, flags); +} + +static void +start_adc(struct au1550_state *s) +{ + struct dmabuf *db = &s->dma_adc; + int i; + + if (!db->stopped) + return; + + /* Put two buffers on the ring to get things started. + */ + for (i=0; i<2; i++) { + au1xxx_dbdma_put_dest(db->dmanr, db->nextIn, db->dma_fragsize); + + db->nextIn += db->dma_fragsize; + if (db->nextIn >= db->rawbuf + db->dmasize) + db->nextIn -= db->dmasize; + } + + set_recv_slots(db->num_channels); + au1xxx_dbdma_start(db->dmanr); + au_writel(PSC_AC97PCR_RC, PSC_AC97PCR); + au_sync(); + au_writel(PSC_AC97PCR_RS, PSC_AC97PCR); + au_sync(); + + db->stopped = 0; +} + +static int +prog_dmabuf(struct au1550_state *s, struct dmabuf *db) +{ + unsigned user_bytes_per_sec; + unsigned bufs; + unsigned rate = db->sample_rate; + + if (!db->rawbuf) { + db->ready = db->mapped = 0; + db->buforder = 5; /* 32 * PAGE_SIZE */ + db->rawbuf = kmalloc((PAGE_SIZE << db->buforder), GFP_KERNEL); + if (!db->rawbuf) + return -ENOMEM; + } + + db->cnt_factor = 1; + if (db->sample_size == 8) + db->cnt_factor *= 2; + if (db->num_channels == 1) + db->cnt_factor *= 2; + db->cnt_factor *= db->src_factor; + + db->count = 0; + db->dma_qcount = 0; + db->nextIn = db->nextOut = db->rawbuf; + + db->user_bytes_per_sample = (db->sample_size>>3) * db->num_channels; + db->dma_bytes_per_sample = 2 * ((db->num_channels == 1) ? + 2 : db->num_channels); + + user_bytes_per_sec = rate * db->user_bytes_per_sample; + bufs = PAGE_SIZE << db->buforder; + if (db->ossfragshift) { + if ((1000 << db->ossfragshift) < user_bytes_per_sec) + db->fragshift = ld2(user_bytes_per_sec/1000); + else + db->fragshift = db->ossfragshift; + } else { + db->fragshift = ld2(user_bytes_per_sec / 100 / + (db->subdivision ? db->subdivision : 1)); + if (db->fragshift < 3) + db->fragshift = 3; + } + + db->fragsize = 1 << db->fragshift; + db->dma_fragsize = db->fragsize * db->cnt_factor; + db->numfrag = bufs / db->dma_fragsize; + + while (db->numfrag < 4 && db->fragshift > 3) { + db->fragshift--; + db->fragsize = 1 << db->fragshift; + db->dma_fragsize = db->fragsize * db->cnt_factor; + db->numfrag = bufs / db->dma_fragsize; + } + + if (db->ossmaxfrags >= 4 && db->ossmaxfrags < db->numfrag) + db->numfrag = db->ossmaxfrags; + + db->dmasize = db->dma_fragsize * db->numfrag; + memset(db->rawbuf, 0, bufs); + + pr_debug("prog_dmabuf: rate=%d, samplesize=%d, channels=%d\n", + rate, db->sample_size, db->num_channels); + pr_debug("prog_dmabuf: fragsize=%d, cnt_factor=%d, dma_fragsize=%d\n", + db->fragsize, db->cnt_factor, db->dma_fragsize); + pr_debug("prog_dmabuf: numfrag=%d, dmasize=%d\n", db->numfrag, db->dmasize); + + db->ready = 1; + return 0; +} + +static int +prog_dmabuf_adc(struct au1550_state *s) +{ + stop_adc(s); + return prog_dmabuf(s, &s->dma_adc); + +} + +static int +prog_dmabuf_dac(struct au1550_state *s) +{ + stop_dac(s); + return prog_dmabuf(s, &s->dma_dac); +} + + +/* hold spinlock for the following */ +static void +dac_dma_interrupt(int irq, void *dev_id, struct pt_regs *regs) +{ + struct au1550_state *s = (struct au1550_state *) dev_id; + struct dmabuf *db = &s->dma_dac; + u32 ac97c_stat; + + ac97c_stat = au_readl(PSC_AC97STAT); + if (ac97c_stat & (AC97C_XU | AC97C_XO | AC97C_TE)) + pr_debug("AC97C status = 0x%08x\n", ac97c_stat); + db->dma_qcount--; + + if (db->count >= db->fragsize) { + if (au1xxx_dbdma_put_source(db->dmanr, db->nextOut, + db->fragsize) == 0) { + err("qcount < 2 and no ring room!"); + } + db->nextOut += db->fragsize; + if (db->nextOut >= db->rawbuf + db->dmasize) + db->nextOut -= db->dmasize; + db->count -= db->fragsize; + db->total_bytes += db->dma_fragsize; + db->dma_qcount++; + } + + /* wake up anybody listening */ + if (waitqueue_active(&db->wait)) + wake_up(&db->wait); +} + + +static void +adc_dma_interrupt(int irq, void *dev_id, struct pt_regs *regs) +{ + struct au1550_state *s = (struct au1550_state *)dev_id; + struct dmabuf *dp = &s->dma_adc; + u32 obytes; + char *obuf; + + /* Pull the buffer from the dma queue. + */ + au1xxx_dbdma_get_dest(dp->dmanr, (void *)(&obuf), &obytes); + + if ((dp->count + obytes) > dp->dmasize) { + /* Overrun. Stop ADC and log the error + */ + stop_adc(s); + dp->error++; + err("adc overrun"); + return; + } + + /* Put a new empty buffer on the destination DMA. + */ + au1xxx_dbdma_put_dest(dp->dmanr, dp->nextIn, dp->dma_fragsize); + + dp->nextIn += dp->dma_fragsize; + if (dp->nextIn >= dp->rawbuf + dp->dmasize) + dp->nextIn -= dp->dmasize; + + dp->count += obytes; + dp->total_bytes += obytes; + + /* wake up anybody listening + */ + if (waitqueue_active(&dp->wait)) + wake_up(&dp->wait); + +} + +static loff_t +au1550_llseek(struct file *file, loff_t offset, int origin) +{ + return -ESPIPE; +} + + +static int +au1550_open_mixdev(struct inode *inode, struct file *file) +{ + file->private_data = &au1550_state; + return 0; +} + +static int +au1550_release_mixdev(struct inode *inode, struct file *file) +{ + return 0; +} + +static int +mixdev_ioctl(struct ac97_codec *codec, unsigned int cmd, + unsigned long arg) +{ + return codec->mixer_ioctl(codec, cmd, arg); +} + +static int +au1550_ioctl_mixdev(struct inode *inode, struct file *file, + unsigned int cmd, unsigned long arg) +{ + struct au1550_state *s = (struct au1550_state *)file->private_data; + struct ac97_codec *codec = s->codec; + + return mixdev_ioctl(codec, cmd, arg); +} + +static /*const */ struct file_operations au1550_mixer_fops = { + owner:THIS_MODULE, + llseek:au1550_llseek, + ioctl:au1550_ioctl_mixdev, + open:au1550_open_mixdev, + release:au1550_release_mixdev, +}; + +static int +drain_dac(struct au1550_state *s, int nonblock) +{ + unsigned long flags; + int count, tmo; + + if (s->dma_dac.mapped || !s->dma_dac.ready || s->dma_dac.stopped) + return 0; + + for (;;) { + spin_lock_irqsave(&s->lock, flags); + count = s->dma_dac.count; + spin_unlock_irqrestore(&s->lock, flags); + if (count <= s->dma_dac.fragsize) + break; + if (signal_pending(current)) + break; + if (nonblock) + return -EBUSY; + tmo = 1000 * count / (s->no_vra ? + 48000 : s->dma_dac.sample_rate); + tmo /= s->dma_dac.dma_bytes_per_sample; + au1550_delay(tmo); + } + if (signal_pending(current)) + return -ERESTARTSYS; + return 0; +} + +static inline u8 S16_TO_U8(s16 ch) +{ + return (u8) (ch >> 8) + 0x80; +} +static inline s16 U8_TO_S16(u8 ch) +{ + return (s16) (ch - 0x80) << 8; +} + +/* + * Translates user samples to dma buffer suitable for AC'97 DAC data: + * If mono, copy left channel to right channel in dma buffer. + * If 8 bit samples, cvt to 16-bit before writing to dma buffer. + * If interpolating (no VRA), duplicate every audio frame src_factor times. + */ +static int +translate_from_user(struct dmabuf *db, char* dmabuf, char* userbuf, + int dmacount) +{ + int sample, i; + int interp_bytes_per_sample; + int num_samples; + int mono = (db->num_channels == 1); + char usersample[12]; + s16 ch, dmasample[6]; + + if (db->sample_size == 16 && !mono && db->src_factor == 1) { + /* no translation necessary, just copy + */ + if (copy_from_user(dmabuf, userbuf, dmacount)) + return -EFAULT; + return dmacount; + } + + interp_bytes_per_sample = db->dma_bytes_per_sample * db->src_factor; + num_samples = dmacount / interp_bytes_per_sample; + + for (sample = 0; sample < num_samples; sample++) { + if (copy_from_user(usersample, userbuf, + db->user_bytes_per_sample)) { + return -EFAULT; + } + + for (i = 0; i < db->num_channels; i++) { + if (db->sample_size == 8) + ch = U8_TO_S16(usersample[i]); + else + ch = *((s16 *) (&usersample[i * 2])); + dmasample[i] = ch; + if (mono) + dmasample[i + 1] = ch; /* right channel */ + } + + /* duplicate every audio frame src_factor times + */ + for (i = 0; i < db->src_factor; i++) + memcpy(dmabuf, dmasample, db->dma_bytes_per_sample); + + userbuf += db->user_bytes_per_sample; + dmabuf += interp_bytes_per_sample; + } + + return num_samples * interp_bytes_per_sample; +} + +/* + * Translates AC'97 ADC samples to user buffer: + * If mono, send only left channel to user buffer. + * If 8 bit samples, cvt from 16 to 8 bit before writing to user buffer. + * If decimating (no VRA), skip over src_factor audio frames. + */ +static int +translate_to_user(struct dmabuf *db, char* userbuf, char* dmabuf, + int dmacount) +{ + int sample, i; + int interp_bytes_per_sample; + int num_samples; + int mono = (db->num_channels == 1); + char usersample[12]; + + if (db->sample_size == 16 && !mono && db->src_factor == 1) { + /* no translation necessary, just copy + */ + if (copy_to_user(userbuf, dmabuf, dmacount)) + return -EFAULT; + return dmacount; + } + + interp_bytes_per_sample = db->dma_bytes_per_sample * db->src_factor; + num_samples = dmacount / interp_bytes_per_sample; + + for (sample = 0; sample < num_samples; sample++) { + for (i = 0; i < db->num_channels; i++) { + if (db->sample_size == 8) + usersample[i] = + S16_TO_U8(*((s16 *) (&dmabuf[i * 2]))); + else + *((s16 *) (&usersample[i * 2])) = + *((s16 *) (&dmabuf[i * 2])); + } + + if (copy_to_user(userbuf, usersample, + db->user_bytes_per_sample)) { + return -EFAULT; + } + + userbuf += db->user_bytes_per_sample; + dmabuf += interp_bytes_per_sample; + } + + return num_samples * interp_bytes_per_sample; +} + +/* + * Copy audio data to/from user buffer from/to dma buffer, taking care + * that we wrap when reading/writing the dma buffer. Returns actual byte + * count written to or read from the dma buffer. + */ +static int +copy_dmabuf_user(struct dmabuf *db, char* userbuf, int count, int to_user) +{ + char *bufptr = to_user ? db->nextOut : db->nextIn; + char *bufend = db->rawbuf + db->dmasize; + int cnt, ret; + + if (bufptr + count > bufend) { + int partial = (int) (bufend - bufptr); + if (to_user) { + if ((cnt = translate_to_user(db, userbuf, + bufptr, partial)) < 0) + return cnt; + ret = cnt; + if ((cnt = translate_to_user(db, userbuf + partial, + db->rawbuf, + count - partial)) < 0) + return cnt; + ret += cnt; + } else { + if ((cnt = translate_from_user(db, bufptr, userbuf, + partial)) < 0) + return cnt; + ret = cnt; + if ((cnt = translate_from_user(db, db->rawbuf, + userbuf + partial, + count - partial)) < 0) + return cnt; + ret += cnt; + } + } else { + if (to_user) + ret = translate_to_user(db, userbuf, bufptr, count); + else + ret = translate_from_user(db, bufptr, userbuf, count); + } + + return ret; +} + + +static ssize_t +au1550_read(struct file *file, char *buffer, size_t count, loff_t *ppos) +{ + struct au1550_state *s = (struct au1550_state *)file->private_data; + struct dmabuf *db = &s->dma_adc; + DECLARE_WAITQUEUE(wait, current); + ssize_t ret; + unsigned long flags; + int cnt, usercnt, avail; + + if (db->mapped) + return -ENXIO; + if (!access_ok(VERIFY_WRITE, buffer, count)) + return -EFAULT; + ret = 0; + + count *= db->cnt_factor; + + down(&s->sem); + add_wait_queue(&db->wait, &wait); + + while (count > 0) { + /* wait for samples in ADC dma buffer + */ + do { + if (db->stopped) + start_adc(s); + spin_lock_irqsave(&s->lock, flags); + avail = db->count; + if (avail <= 0) + __set_current_state(TASK_INTERRUPTIBLE); + spin_unlock_irqrestore(&s->lock, flags); + if (avail <= 0) { + if (file->f_flags & O_NONBLOCK) { + if (!ret) + ret = -EAGAIN; + goto out; + } + up(&s->sem); + schedule(); + if (signal_pending(current)) { + if (!ret) + ret = -ERESTARTSYS; + goto out2; + } + down(&s->sem); + } + } while (avail <= 0); + + /* copy from nextOut to user + */ + if ((cnt = copy_dmabuf_user(db, buffer, + count > avail ? + avail : count, 1)) < 0) { + if (!ret) + ret = -EFAULT; + goto out; + } + + spin_lock_irqsave(&s->lock, flags); + db->count -= cnt; + db->nextOut += cnt; + if (db->nextOut >= db->rawbuf + db->dmasize) + db->nextOut -= db->dmasize; + spin_unlock_irqrestore(&s->lock, flags); + + count -= cnt; + usercnt = cnt / db->cnt_factor; + buffer += usercnt; + ret += usercnt; + } /* while (count > 0) */ + +out: + up(&s->sem); +out2: + remove_wait_queue(&db->wait, &wait); + set_current_state(TASK_RUNNING); + return ret; +} + +static ssize_t +au1550_write(struct file *file, const char *buffer, size_t count, loff_t * ppos) +{ + struct au1550_state *s = (struct au1550_state *)file->private_data; + struct dmabuf *db = &s->dma_dac; + DECLARE_WAITQUEUE(wait, current); + ssize_t ret = 0; + unsigned long flags; + int cnt, usercnt, avail; + + pr_debug("write: count=%d\n", count); + + if (db->mapped) + return -ENXIO; + if (!access_ok(VERIFY_READ, buffer, count)) + return -EFAULT; + + count *= db->cnt_factor; + + down(&s->sem); + add_wait_queue(&db->wait, &wait); + + while (count > 0) { + /* wait for space in playback buffer + */ + do { + spin_lock_irqsave(&s->lock, flags); + avail = (int) db->dmasize - db->count; + if (avail <= 0) + __set_current_state(TASK_INTERRUPTIBLE); + spin_unlock_irqrestore(&s->lock, flags); + if (avail <= 0) { + if (file->f_flags & O_NONBLOCK) { + if (!ret) + ret = -EAGAIN; + goto out; + } + up(&s->sem); + schedule(); + if (signal_pending(current)) { + if (!ret) + ret = -ERESTARTSYS; + goto out2; + } + down(&s->sem); + } + } while (avail <= 0); + + /* copy from user to nextIn + */ + if ((cnt = copy_dmabuf_user(db, (char *) buffer, + count > avail ? + avail : count, 0)) < 0) { + if (!ret) + ret = -EFAULT; + goto out; + } + + spin_lock_irqsave(&s->lock, flags); + db->count += cnt; + db->nextIn += cnt; + if (db->nextIn >= db->rawbuf + db->dmasize) + db->nextIn -= db->dmasize; + + /* If the data is available, we want to keep two buffers + * on the dma queue. If the queue count reaches zero, + * we know the dma has stopped. + */ + while ((db->dma_qcount < 2) && (db->count >= db->fragsize)) { + if (au1xxx_dbdma_put_source(db->dmanr, db->nextOut, + db->fragsize) == 0) { + err("qcount < 2 and no ring room!"); + } + db->nextOut += db->fragsize; + if (db->nextOut >= db->rawbuf + db->dmasize) + db->nextOut -= db->dmasize; + db->total_bytes += db->dma_fragsize; + if (db->dma_qcount == 0) + start_dac(s); + db->dma_qcount++; + } + spin_unlock_irqrestore(&s->lock, flags); + + count -= cnt; + usercnt = cnt / db->cnt_factor; + buffer += usercnt; + ret += usercnt; + } /* while (count > 0) */ + +out: + up(&s->sem); +out2: + remove_wait_queue(&db->wait, &wait); + set_current_state(TASK_RUNNING); + return ret; +} + + +/* No kernel lock - we have our own spinlock */ +static unsigned int +au1550_poll(struct file *file, struct poll_table_struct *wait) +{ + struct au1550_state *s = (struct au1550_state *)file->private_data; + unsigned long flags; + unsigned int mask = 0; + + if (file->f_mode & FMODE_WRITE) { + if (!s->dma_dac.ready) + return 0; + poll_wait(file, &s->dma_dac.wait, wait); + } + if (file->f_mode & FMODE_READ) { + if (!s->dma_adc.ready) + return 0; + poll_wait(file, &s->dma_adc.wait, wait); + } + + spin_lock_irqsave(&s->lock, flags); + + if (file->f_mode & FMODE_READ) { + if (s->dma_adc.count >= (signed)s->dma_adc.dma_fragsize) + mask |= POLLIN | POLLRDNORM; + } + if (file->f_mode & FMODE_WRITE) { + if (s->dma_dac.mapped) { + if (s->dma_dac.count >= + (signed)s->dma_dac.dma_fragsize) + mask |= POLLOUT | POLLWRNORM; + } else { + if ((signed) s->dma_dac.dmasize >= + s->dma_dac.count + (signed)s->dma_dac.dma_fragsize) + mask |= POLLOUT | POLLWRNORM; + } + } + spin_unlock_irqrestore(&s->lock, flags); + return mask; +} + +static int +au1550_mmap(struct file *file, struct vm_area_struct *vma) +{ + struct au1550_state *s = (struct au1550_state *)file->private_data; + struct dmabuf *db; + unsigned long size; + int ret = 0; + + lock_kernel(); + down(&s->sem); + if (vma->vm_flags & VM_ |