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Diffstat (limited to 'sound/oss/au1000.c')
| -rw-r--r-- | sound/oss/au1000.c | 2216 |
1 files changed, 0 insertions, 2216 deletions
diff --git a/sound/oss/au1000.c b/sound/oss/au1000.c deleted file mode 100644 index e3796231452a..000000000000 --- a/sound/oss/au1000.c +++ /dev/null @@ -1,2216 +0,0 @@ -/* - * au1000.c -- Sound driver for Alchemy Au1000 MIPS Internet Edge - * Processor. - * - * Copyright 2001 MontaVista Software Inc. - * Author: MontaVista Software, Inc. - * stevel@mvista.com or source@mvista.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. - * - * - * Module command line parameters: - * - * Supported devices: - * /dev/dsp standard OSS /dev/dsp device - * /dev/mixer standard OSS /dev/mixer device - * - * Notes: - * - * 1. Much of the OSS buffer allocation, ioctl's, and mmap'ing are - * taken, slightly modified or not at all, from the ES1371 driver, - * so refer to the credits in es1371.c for those. The rest of the - * code (probe, open, read, write, the ISR, etc.) is new. - * - * Revision history - * 06.27.2001 Initial version - * 03.20.2002 Added mutex locks around read/write methods, to prevent - * simultaneous access on SMP or preemptible kernels. Also - * removed the counter/pointer fragment aligning at the end - * of read/write methods [stevel]. - * 03.21.2002 Add support for coherent DMA on the audio read/write DMA - * channels [stevel]. - * - */ -#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/page-flags.h> -#include <linux/poll.h> -#include <linux/pci.h> -#include <linux/bitops.h> -#include <linux/proc_fs.h> -#include <linux/spinlock.h> -#include <linux/smp_lock.h> -#include <linux/ac97_codec.h> -#include <linux/interrupt.h> -#include <linux/mutex.h> - -#include <asm/io.h> -#include <asm/uaccess.h> -#include <asm/mach-au1x00/au1000.h> -#include <asm/mach-au1x00/au1000_dma.h> - -/* --------------------------------------------------------------------- */ - -#undef OSS_DOCUMENTED_MIXER_SEMANTICS -#undef AU1000_DEBUG -#undef AU1000_VERBOSE_DEBUG - -#define AU1000_MODULE_NAME "Au1000 audio" -#define PFX AU1000_MODULE_NAME - -#ifdef AU1000_DEBUG -#define dbg(format, arg...) printk(KERN_DEBUG PFX ": " format "\n" , ## arg) -#else -#define dbg(format, arg...) do {} while (0) -#endif -#define err(format, arg...) printk(KERN_ERR PFX ": " format "\n" , ## arg) -#define info(format, arg...) printk(KERN_INFO PFX ": " format "\n" , ## arg) -#define warn(format, arg...) printk(KERN_WARNING PFX ": " format "\n" , ## arg) - - -/* misc stuff */ -#define POLL_COUNT 0x5000 -#define AC97_EXT_DACS (AC97_EXTID_SDAC | AC97_EXTID_CDAC | AC97_EXTID_LDAC) - -/* Boot options */ -static int vra = 0; // 0 = no VRA, 1 = use VRA if codec supports it -module_param(vra, bool, 0); -MODULE_PARM_DESC(vra, "if 1 use VRA if codec supports it"); - - -/* --------------------------------------------------------------------- */ - -struct au1000_state { - /* soundcore stuff */ - int dev_audio; - -#ifdef AU1000_DEBUG - /* debug /proc entry */ - struct proc_dir_entry *ps; - struct proc_dir_entry *ac97_ps; -#endif /* AU1000_DEBUG */ - - 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 mutex open_mutex; - struct mutex sem; - mode_t open_mode; - wait_queue_head_t open_wait; - - struct dmabuf { - unsigned int dmanr; // DMA Channel number - unsigned sample_rate; // Hz - unsigned src_factor; // SRC interp/decimation (no vra) - unsigned sample_size; // 8 or 16 - int num_channels; // 1 = mono, 2 = stereo, 4, 6 - int dma_bytes_per_sample;// DMA bytes per audio sample frame - int user_bytes_per_sample;// User bytes per audio sample frame - int cnt_factor; // user-to-DMA bytes per audio - // sample frame - void *rawbuf; - dma_addr_t dmaaddr; - unsigned buforder; - unsigned numfrag; // # of DMA fragments in DMA buffer - unsigned fragshift; - void *nextIn; // ptr to next-in to DMA buffer - void *nextOut;// ptr to next-out from DMA buffer - int count; // current byte count in DMA buffer - unsigned total_bytes; // total bytes written or read - unsigned error; // over/underrun - wait_queue_head_t wait; - /* redundant, but makes calculations easier */ - unsigned fragsize; // user perception of fragment size - unsigned dma_fragsize; // DMA (real) fragment size - unsigned dmasize; // Total DMA buffer size - // (mult. of DMA fragsize) - /* OSS stuff */ - unsigned mapped:1; - unsigned ready:1; - unsigned stopped:1; - unsigned ossfragshift; - int ossmaxfrags; - unsigned subdivision; - } dma_dac , dma_adc; -} au1000_state; - -/* --------------------------------------------------------------------- */ - - -static inline 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 au1000_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 au1000_state *s = (struct au1000_state *)codec->private_data; - unsigned long flags; - u32 cmd; - u16 data; - int i; - - spin_lock_irqsave(&s->lock, flags); - - for (i = 0; i < POLL_COUNT; i++) - if (!(au_readl(AC97C_STATUS) & AC97C_CP)) - break; - if (i == POLL_COUNT) - err("rdcodec: codec cmd pending expired!"); - - cmd = (u32) addr & AC97C_INDEX_MASK; - cmd |= AC97C_READ; // read command - au_writel(cmd, AC97C_CMD); - - /* now wait for the data */ - for (i = 0; i < POLL_COUNT; i++) - if (!(au_readl(AC97C_STATUS) & AC97C_CP)) - break; - if (i == POLL_COUNT) { - err("rdcodec: read poll expired!"); - return 0; - } - - data = au_readl(AC97C_CMD) & 0xffff; - - spin_unlock_irqrestore(&s->lock, flags); - - return data; -} - - -static void wrcodec(struct ac97_codec *codec, u8 addr, u16 data) -{ - struct au1000_state *s = (struct au1000_state *)codec->private_data; - unsigned long flags; - u32 cmd; - int i; - - spin_lock_irqsave(&s->lock, flags); - - for (i = 0; i < POLL_COUNT; i++) - if (!(au_readl(AC97C_STATUS) & AC97C_CP)) - break; - if (i == POLL_COUNT) - err("wrcodec: codec cmd pending expired!"); - - cmd = (u32) addr & AC97C_INDEX_MASK; - cmd &= ~AC97C_READ; // write command - cmd |= ((u32) data << AC97C_WD_BIT); // OR in the data word - au_writel(cmd, AC97C_CMD); - - spin_unlock_irqrestore(&s->lock, flags); -} - -static void waitcodec(struct ac97_codec *codec) -{ - u16 temp; - int i; - - /* codec_wait is used to wait for a ready state after - an AC97C_RESET. */ - au1000_delay(10); - - // first poll the CODEC_READY tag bit - for (i = 0; i < POLL_COUNT; i++) - if (au_readl(AC97C_STATUS) & AC97C_READY) - 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); - au1000_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 au1000_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); - -#ifdef AU1000_VERBOSE_DEBUG - dbg("%s: set to %d Hz", __FUNCTION__, adc_rate); -#endif - - // 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 au1000_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); - -#ifdef AU1000_VERBOSE_DEBUG - dbg("%s: set to %d Hz", __FUNCTION__, dac_rate); -#endif - - // 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 au1000_state *s) -{ - struct dmabuf *db = &s->dma_dac; - unsigned long flags; - - if (db->stopped) - return; - - spin_lock_irqsave(&s->lock, flags); - - disable_dma(db->dmanr); - - db->stopped = 1; - - spin_unlock_irqrestore(&s->lock, flags); -} - -static void stop_adc(struct au1000_state *s) -{ - struct dmabuf *db = &s->dma_adc; - unsigned long flags; - - if (db->stopped) - return; - - spin_lock_irqsave(&s->lock, flags); - - disable_dma(db->dmanr); - - db->stopped = 1; - - spin_unlock_irqrestore(&s->lock, flags); -} - - -static void set_xmit_slots(int num_channels) -{ - u32 ac97_config = au_readl(AC97C_CONFIG) & ~AC97C_XMIT_SLOTS_MASK; - - switch (num_channels) { - case 1: // mono - case 2: // stereo, slots 3,4 - ac97_config |= (0x3 << AC97C_XMIT_SLOTS_BIT); - break; - case 4: // stereo with surround, slots 3,4,7,8 - ac97_config |= (0x33 << AC97C_XMIT_SLOTS_BIT); - break; - case 6: // stereo with surround and center/LFE, slots 3,4,6,7,8,9 - ac97_config |= (0x7b << AC97C_XMIT_SLOTS_BIT); - break; - } - - au_writel(ac97_config, AC97C_CONFIG); -} - -static void set_recv_slots(int num_channels) -{ - u32 ac97_config = au_readl(AC97C_CONFIG) & ~AC97C_RECV_SLOTS_MASK; - - /* - * Always enable slots 3 and 4 (stereo). Slot 6 is - * optional Mic ADC, which I don't support yet. - */ - ac97_config |= (0x3 << AC97C_RECV_SLOTS_BIT); - - au_writel(ac97_config, AC97C_CONFIG); -} - -static void start_dac(struct au1000_state *s) -{ - struct dmabuf *db = &s->dma_dac; - unsigned long flags; - unsigned long buf1, buf2; - - if (!db->stopped) - return; - - spin_lock_irqsave(&s->lock, flags); - - au_readl(AC97C_STATUS); // read status to clear sticky bits - - // reset Buffer 1 and 2 pointers to nextOut and nextOut+dma_fragsize - buf1 = virt_to_phys(db->nextOut); - buf2 = buf1 + db->dma_fragsize; - if (buf2 >= db->dmaaddr + db->dmasize) - buf2 -= db->dmasize; - - set_xmit_slots(db->num_channels); - - init_dma(db->dmanr); - if (get_dma_active_buffer(db->dmanr) == 0) { - clear_dma_done0(db->dmanr); // clear DMA done bit - set_dma_addr0(db->dmanr, buf1); - set_dma_addr1(db->dmanr, buf2); - } else { - clear_dma_done1(db->dmanr); // clear DMA done bit - set_dma_addr1(db->dmanr, buf1); - set_dma_addr0(db->dmanr, buf2); - } - set_dma_count(db->dmanr, db->dma_fragsize>>1); - enable_dma_buffers(db->dmanr); - - start_dma(db->dmanr); - -#ifdef AU1000_VERBOSE_DEBUG - dump_au1000_dma_channel(db->dmanr); -#endif - - db->stopped = 0; - - spin_unlock_irqrestore(&s->lock, flags); -} - -static void start_adc(struct au1000_state *s) -{ - struct dmabuf *db = &s->dma_adc; - unsigned long flags; - unsigned long buf1, buf2; - - if (!db->stopped) - return; - - spin_lock_irqsave(&s->lock, flags); - - au_readl(AC97C_STATUS); // read status to clear sticky bits - - // reset Buffer 1 and 2 pointers to nextIn and nextIn+dma_fragsize - buf1 = virt_to_phys(db->nextIn); - buf2 = buf1 + db->dma_fragsize; - if (buf2 >= db->dmaaddr + db->dmasize) - buf2 -= db->dmasize; - - set_recv_slots(db->num_channels); - - init_dma(db->dmanr); - if (get_dma_active_buffer(db->dmanr) == 0) { - clear_dma_done0(db->dmanr); // clear DMA done bit - set_dma_addr0(db->dmanr, buf1); - set_dma_addr1(db->dmanr, buf2); - } else { - clear_dma_done1(db->dmanr); // clear DMA done bit - set_dma_addr1(db->dmanr, buf1); - set_dma_addr0(db->dmanr, buf2); - } - set_dma_count(db->dmanr, db->dma_fragsize>>1); - enable_dma_buffers(db->dmanr); - - start_dma(db->dmanr); - -#ifdef AU1000_VERBOSE_DEBUG - dump_au1000_dma_channel(db->dmanr); -#endif - - db->stopped = 0; - - spin_unlock_irqrestore(&s->lock, flags); -} - -/* --------------------------------------------------------------------- */ - -#define DMABUF_DEFAULTORDER (17-PAGE_SHIFT) -#define DMABUF_MINORDER 1 - -static inline void dealloc_dmabuf(struct au1000_state *s, struct dmabuf *db) -{ - struct page *page, *pend; - - if (db->rawbuf) { - /* undo marking the pages as reserved */ - pend = virt_to_page(db->rawbuf + - (PAGE_SIZE << db->buforder) - 1); - for (page = virt_to_page(db->rawbuf); page <= pend; page++) - ClearPageReserved(page); - dma_free_noncoherent(NULL, - PAGE_SIZE << db->buforder, - db->rawbuf, - db->dmaaddr); - } - db->rawbuf = db->nextIn = db->nextOut = NULL; - db->mapped = db->ready = 0; -} - -static int prog_dmabuf(struct au1000_state *s, struct dmabuf *db) -{ - int order; - unsigned user_bytes_per_sec; - unsigned bufs; - struct page *page, *pend; - unsigned rate = db->sample_rate; - - if (!db->rawbuf) { - db->ready = db->mapped = 0; - for (order = DMABUF_DEFAULTORDER; - order >= DMABUF_MINORDER; order--) - if ((db->rawbuf = dma_alloc_noncoherent(NULL, - PAGE_SIZE << order, - &db->dmaaddr, - 0))) - break; - if (!db->rawbuf) - return -ENOMEM; - db->buforder = order; - /* now mark the pages as reserved; - otherwise remap_pfn_range doesn't do what we want */ - pend = virt_to_page(db->rawbuf + - (PAGE_SIZE << db->buforder) - 1); - for (page = virt_to_page(db->rawbuf); page <= pend; page++) - SetPageReserved(page); - } - - 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->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); - -#ifdef AU1000_VERBOSE_DEBUG - dbg("rate=%d, samplesize=%d, channels=%d", - rate, db->sample_size, db->num_channels); - dbg("fragsize=%d, cnt_factor=%d, dma_fragsize=%d", - db->fragsize, db->cnt_factor, db->dma_fragsize); - dbg("numfrag=%d, dmasize=%d", db->numfrag, db->dmasize); -#endif - - db->ready = 1; - return 0; -} - -static inline int prog_dmabuf_adc(struct au1000_state *s) -{ - stop_adc(s); - return prog_dmabuf(s, &s->dma_adc); - -} - -static inline int prog_dmabuf_dac(struct au1000_state *s) -{ - stop_dac(s); - return prog_dmabuf(s, &s->dma_dac); -} - - -/* hold spinlock for the following */ -static irqreturn_t dac_dma_interrupt(int irq, void *dev_id, struct pt_regs *regs) -{ - struct au1000_state *s = (struct au1000_state *) dev_id; - struct dmabuf *dac = &s->dma_dac; - unsigned long newptr; - u32 ac97c_stat, buff_done; - - ac97c_stat = au_readl(AC97C_STATUS); -#ifdef AU1000_VERBOSE_DEBUG - if (ac97c_stat & (AC97C_XU | AC97C_XO | AC97C_TE)) - dbg("AC97C status = 0x%08x", ac97c_stat); -#endif - - if ((buff_done = get_dma_buffer_done(dac->dmanr)) == 0) { - /* fastpath out, to ease interrupt sharing */ - return IRQ_HANDLED; - } - - spin_lock(&s->lock); - - if (buff_done != (DMA_D0 | DMA_D1)) { - dac->nextOut += dac->dma_fragsize; - if (dac->nextOut >= dac->rawbuf + dac->dmasize) - dac->nextOut -= dac->dmasize; - - /* update playback pointers */ - newptr = virt_to_phys(dac->nextOut) + dac->dma_fragsize; - if (newptr >= dac->dmaaddr + dac->dmasize) - newptr -= dac->dmasize; - - dac->count -= dac->dma_fragsize; - dac->total_bytes += dac->dma_fragsize; - - if (dac->count <= 0) { -#ifdef AU1000_VERBOSE_DEBUG - dbg("dac underrun"); -#endif - spin_unlock(&s->lock); - stop_dac(s); - spin_lock(&s->lock); - dac->count = 0; - dac->nextIn = dac->nextOut; - } else if (buff_done == DMA_D0) { - clear_dma_done0(dac->dmanr); // clear DMA done bit - set_dma_count0(dac->dmanr, dac->dma_fragsize>>1); - set_dma_addr0(dac->dmanr, newptr); - enable_dma_buffer0(dac->dmanr); // reenable - } else { - clear_dma_done1(dac->dmanr); // clear DMA done bit - set_dma_count1(dac->dmanr, dac->dma_fragsize>>1); - set_dma_addr1(dac->dmanr, newptr); - enable_dma_buffer1(dac->dmanr); // reenable - } - } else { - // both done bits set, we missed an interrupt - spin_unlock(&s->lock); - stop_dac(s); - spin_lock(&s->lock); - - dac->nextOut += 2*dac->dma_fragsize; - if (dac->nextOut >= dac->rawbuf + dac->dmasize) - dac->nextOut -= dac->dmasize; - - dac->count -= 2*dac->dma_fragsize; - dac->total_bytes += 2*dac->dma_fragsize; - - if (dac->count > 0) { - spin_unlock(&s->lock); - start_dac(s); - spin_lock(&s->lock); - } - } - - /* wake up anybody listening */ - if (waitqueue_active(&dac->wait)) - wake_up(&dac->wait); - - spin_unlock(&s->lock); - - return IRQ_HANDLED; -} - - -static irqreturn_t adc_dma_interrupt(int irq, void *dev_id, struct pt_regs *regs) -{ - struct au1000_state *s = (struct au1000_state *) dev_id; - struct dmabuf *adc = &s->dma_adc; - unsigned long newptr; - u32 ac97c_stat, buff_done; - - ac97c_stat = au_readl(AC97C_STATUS); -#ifdef AU1000_VERBOSE_DEBUG - if (ac97c_stat & (AC97C_RU | AC97C_RO)) - dbg("AC97C status = 0x%08x", ac97c_stat); -#endif - - if ((buff_done = get_dma_buffer_done(adc->dmanr)) == 0) { - /* fastpath out, to ease interrupt sharing */ - return IRQ_HANDLED; - } - - spin_lock(&s->lock); - - if (buff_done != (DMA_D0 | DMA_D1)) { - if (adc->count + adc->dma_fragsize > adc->dmasize) { - // Overrun. Stop ADC and log the error - spin_unlock(&s->lock); - stop_adc(s); - adc->error++; - err("adc overrun"); - return IRQ_NONE; - } - - adc->nextIn += adc->dma_fragsize; - if (adc->nextIn >= adc->rawbuf + adc->dmasize) - adc->nextIn -= adc->dmasize; - - /* update capture pointers */ - newptr = virt_to_phys(adc->nextIn) + adc->dma_fragsize; - if (newptr >= adc->dmaaddr + adc->dmasize) - newptr -= adc->dmasize; - - adc->count += adc->dma_fragsize; - adc->total_bytes += adc->dma_fragsize; - - if (buff_done == DMA_D0) { - clear_dma_done0(adc->dmanr); // clear DMA done bit - set_dma_count0(adc->dmanr, adc->dma_fragsize>>1); - set_dma_addr0(adc->dmanr, newptr); - enable_dma_buffer0(adc->dmanr); // reenable - } else { - clear_dma_done1(adc->dmanr); // clear DMA done bit - set_dma_count1(adc->dmanr, adc->dma_fragsize>>1); - set_dma_addr1(adc->dmanr, newptr); - enable_dma_buffer1(adc->dmanr); // reenable - } - } else { - // both done bits set, we missed an interrupt - spin_unlock(&s->lock); - stop_adc(s); - spin_lock(&s->lock); - - if (adc->count + 2*adc->dma_fragsize > adc->dmasize) { - // Overrun. Log the error - adc->error++; - err("adc overrun"); - spin_unlock(&s->lock); - return IRQ_NONE; - } - - adc->nextIn += 2*adc->dma_fragsize; - if (adc->nextIn >= adc->rawbuf + adc->dmasize) - adc->nextIn -= adc->dmasize; - - adc->count += 2*adc->dma_fragsize; - adc->total_bytes += 2*adc->dma_fragsize; - - spin_unlock(&s->lock); - start_adc(s); - spin_lock(&s->lock); - } - - /* wake up anybody listening */ - if (waitqueue_active(&adc->wait)) - wake_up(&adc->wait); - - spin_unlock(&s->lock); - - return IRQ_HANDLED; -} - -/* --------------------------------------------------------------------- */ - -static loff_t au1000_llseek(struct file *file, loff_t offset, int origin) -{ - return -ESPIPE; -} - - -static int au1000_open_mixdev(struct inode *inode, struct file *file) -{ - file->private_data = &au1000_state; - return nonseekable_open(inode, file); -} - -static int au1000_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 au1000_ioctl_mixdev(struct inode *inode, struct file *file, - unsigned int cmd, unsigned long arg) -{ - struct au1000_state *s = (struct au1000_state *)file->private_data; - struct ac97_codec *codec = &s->codec; - - return mixdev_ioctl(codec, cmd, arg); -} - -static /*const */ struct file_operations au1000_mixer_fops = { - .owner = THIS_MODULE, - .llseek = au1000_llseek, - .ioctl = au1000_ioctl_mixdev, - .open = au1000_open_mixdev, - .release = au1000_release_mixdev, -}; - -/* --------------------------------------------------------------------- */ - -static int drain_dac(struct au1000_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 <= 0) - 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; - au1000_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)) { - dbg("%s: fault", __FUNCTION__); - 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)) { - dbg("%s: fault", __FUNCTION__); - 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 au1000_read(struct file *file, char *buffer, - size_t count, loff_t *ppos) -{ - struct au1000_state *s = (struct au1000_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; - - mutex_lock(&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; - } - mutex_unlock(&s->sem); - schedule(); - if (signal_pending(current)) { - if (!ret) - ret = -ERESTARTSYS; - goto out2; - } - mutex_lock(&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: |