--- /dev/null
+/*
+ * 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/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/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/wrapper.h>
+#include <asm/io.h>
+#include <asm/uaccess.h>
+#include <asm/hardirq.h>
+#include <asm/au1000.h>
+#include <asm/au1000_dma.h>
+
+/* --------------------------------------------------------------------- */
+
+#undef OSS_DOCUMENTED_MIXER_SEMANTICS
+#define AU1000_DEBUG
+#undef AU1000_VERBOSE_DEBUG
+
+#define USE_COHERENT_DMA
+
+#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_PARM(vra, "i");
+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 semaphore open_sem;
+ struct semaphore 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;
+}
+
+
+#ifdef USE_COHERENT_DMA
+static inline void * dma_alloc(size_t size, dma_addr_t * dma_handle)
+{
+ void* ret = (void *)__get_free_pages(GFP_ATOMIC | GFP_DMA,
+ get_order(size));
+ if (ret != NULL) {
+ memset(ret, 0, size);
+ *dma_handle = virt_to_phys(ret);
+ }
+ return ret;
+}
+
+static inline void dma_free(size_t size, void* va, dma_addr_t dma_handle)
+{
+ free_pages((unsigned long)va, get_order(size));
+}
+#else
+static inline void * dma_alloc(size_t size, dma_addr_t * dma_handle)
+{
+ return pci_alloc_consistent(NULL, size, dma_handle);
+}
+
+static inline void dma_free(size_t size, void* va, dma_addr_t dma_handle)
+{
+ pci_free_consistent(NULL, size, va, dma_handle);
+}
+#endif
+
+/* --------------------------------------------------------------------- */
+
+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(__FUNCTION__ ": set to %d Hz", 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(__FUNCTION__ ": set to %d Hz", 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
+
+extern 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++)
+ mem_map_unreserve(page);
+ dma_free(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(PAGE_SIZE << order,
+ &db->dmaaddr)))
+ break;
+ if (!db->rawbuf)
+ return -ENOMEM;
+ db->buforder = order;
+ /* now mark the pages as reserved;
+ otherwise remap_page_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++)
+ mem_map_reserve(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;
+}
+
+extern inline int prog_dmabuf_adc(struct au1000_state *s)
+{
+ stop_adc(s);
+ return prog_dmabuf(s, &s->dma_adc);
+
+}
+
+extern 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 void 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;
+ }
+
+ 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);
+}
+
+
+static void 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;
+ }
+
+ 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;
+ }
+
+ 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;
+ }
+
+ 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);
+}
+
+/* --------------------------------------------------------------------- */
+
+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 0;
+}
+
+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(__FUNCTION__ ": fault");
+ 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(__FUNCTION__ ": fault");
+ 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 (ppos != &file->f_pos)
+ return -ESPIPE;
+ 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 au1000_write(struct file *file, const char *buffer,
+ size_t count, loff_t * ppos)
+{
+ struct au1000_state *s = (struct au1000_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;
+
+#ifdef AU1000_VERBOSE_DEBUG
+ dbg("write: count=%d", count);
+#endif
+
+ if (ppos != &file->f_pos)
+ return -ESPIPE;
+ 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;
+ spin_unlock_irqrestore(&s->lock, flags);
+ if (db->stopped)
+ start_dac(s);
+
+ 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 au1000_poll(struct file *file,
+ struct poll_table_struct *wait)
+{
+ struct au1000_state *s = (struct au1000_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 au1000_mmap(struct file *file, struct vm_area_struct *vma)
+{
+ struct au1000_state *s = (struct au1000_state *)file->private_data;
+ struct dmabuf *db;
+ unsigned long size;
+ int ret = 0;
+
+ dbg(__FUNCTION__);
+
+ lock_kernel();
+ down(&s->sem);
+ if (vma->vm_flags & VM_WRITE)
+ db = &s->dma_dac;
+ else if (vma->vm_flags & VM_READ)
+ db = &s->dma_adc;
+ else {
+ ret = -EINVAL;
+ goto out;
+ }
+ if (vma->vm_pgoff != 0) {
+ ret = -EINVAL;
+ goto out;
+ }
+ size = vma->vm_end - vma->vm_start;
+ if (size > (PAGE_SIZE << db->buforder)) {
+ ret = -EINVAL;
+ goto out;
+ }
+ if (remap_page_range(vma->vm_start, virt_to_phys(db->rawbuf),
+ size, vma->vm_page_prot)) {
+ ret = -EAGAIN;
+ goto out;
+ }
+ vma->vm_flags &= ~VM_IO;
+ db->mapped = 1;
+out:
+ up(&s->sem);
+ unlock_kernel();
+ return ret;
+}
+
+
+#ifdef AU1000_VERBOSE_DEBUG
+static struct ioctl_str_t {
+ unsigned int cmd;
+ const char *str;
+} ioctl_str[] = {
+ {SNDCTL_DSP_RESET, "SNDCTL_DSP_RESET"},
+ {SNDCTL_DSP_SYNC, "SNDCTL_DSP_SYNC"},
+ {SNDCTL_DSP_SPEED, "SNDCTL_DSP_SPEED"},
+ {SNDCTL_DSP_STEREO, "SNDCTL_DSP_STEREO"},
+ {SNDCTL_DSP_GETBLKSIZE, "SNDCTL_DSP_GETBLKSIZE"},
+ {SNDCTL_DSP_SAMPLESIZE, "SNDCTL_DSP_SAMPLESIZE"},
+ {SNDCTL_DSP_CHANNELS, "SNDCTL_DSP_CHANNELS"},
+ {SOUND_PCM_WRITE_CHANNELS, "SOUND_PCM_WRITE_CHANNELS"},
+ {SOUND_PCM_WRITE_FILTER, "SOUND_PCM_WRITE_FILTER"},
+ {SNDCTL_DSP_POST, "SNDCTL_DSP_POST"},
+ {SNDCTL_DSP_SUBDIVIDE, "SNDCTL_DSP_SUBDIVIDE"},
+ {SNDCTL_DSP_SETFRAGMENT, "SNDCTL_DSP_SETFRAGMENT"},
+ {SNDCTL_DSP_GETFMTS, "SNDCTL_DSP_GETFMTS"},
+ {SNDCTL_DSP_SETFMT, "SNDCTL_DSP_SETFMT"},
+ {SNDCTL_DSP_GETOSPACE, "SNDCTL_DSP_GETOSPACE"},
+ {SNDCTL_DSP_GETISPACE, "SNDCTL_DSP_GETISPACE"},
+ {SNDCTL_DSP_NONBLOCK, "SNDCTL_DSP_NONBLOCK"},
+ {SNDCTL_DSP_GETCAPS, "SNDCTL_DSP_GETCAPS"},
+ {SNDCTL_DSP_GETTRIGGER, "SNDCTL_DSP_GETTRIGGER"},
+ {SNDCTL_DSP_SETTRIGGER, "SNDCTL_DSP_SETTRIGGER"},
+ {SNDCTL_DSP_GETIPTR, "SNDCTL_DSP_GETIPTR"},
+ {SNDCTL_DSP_GETOPTR, "SNDCTL_DSP_GETOPTR"},
+ {SNDCTL_DSP_MAPINBUF, "SNDCTL_DSP_MAPINBUF"},
+ {SNDCTL_DSP_MAPOUTBUF, "SNDCTL_DSP_MAPOUTBUF"},
+ {SNDCTL_DSP_SETSYNCRO, "SNDCTL_DSP_SETSYNCRO"},
+ {SNDCTL_DSP_SETDUPLEX, "SNDCTL_DSP_SETDUPLEX"},
+ {SNDCTL_DSP_GETODELAY, "SNDCTL_DSP_GETODELAY"},
+ {SNDCTL_DSP_GETCHANNELMASK, "SNDCTL_DSP_GETCHANNELMASK"},
+ {SNDCTL_DSP_BIND_CHANNEL, "SNDCTL_DSP_BIND_CHANNEL"},
+ {OSS_GETVERSION, "OSS_GETVERSION"},
+ {SOUND_PCM_READ_RATE, "SOUND_PCM_READ_RATE"},
+ {SOUND_PCM_READ_CHANNELS, "SOUND_PCM_READ_CHANNELS"},
+ {SOUND_PCM_READ_BITS, "SOUND_PCM_READ_BITS"},
+ {SOUND_PCM_READ_FILTER, "SOUND_PCM_READ_FILTER"}
+};
+#endif
+
+// Need to hold a spin-lock before calling this!
+static int dma_count_done(struct dmabuf *db)
+{
+ if (db->stopped)
+ return 0;
+
+ return db->dma_fragsize - get_dma_residue(db->dmanr);
+}
+
+
+static int au1000_ioctl(struct inode *inode, struct file *file,
+ unsigned int cmd, unsigned long arg)
+{
+ struct au1000_state *s = (struct au1000_state *)file->private_data;
+ unsigned long flags;
+ audio_buf_info abinfo;
+ count_info cinfo;
+ int count;
+ int val, mapped, ret, diff;
+
+ mapped = ((file->f_mode & FMODE_WRITE) && s->dma_dac.mapped) ||
+ ((file->f_mode & FMODE_READ) && s->dma_adc.mapped);
+
+#ifdef AU1000_VERBOSE_DEBUG
+ for (count=0; count<sizeof(ioctl_str)/sizeof(ioctl_str[0]); count++) {
+ if (ioctl_str[count].cmd == cmd)
+ break;
+ }
+ if (count < sizeof(ioctl_str) / sizeof(ioctl_str[0]))
+ dbg("ioctl %s, arg=0x%lx", ioctl_str[count].str, arg);
+ else
+ dbg("ioctl 0x%x unknown, arg=0x%lx", cmd, arg);
+#endif
+
+ switch (cmd) {
+ case OSS_GETVERSION:
+ return put_user(SOUND_VERSION, (int *) arg);
+
+ case SNDCTL_DSP_SYNC:
+ if (file->f_mode & FMODE_WRITE)
+ return drain_dac(s, file->f_flags & O_NONBLOCK);
+ return 0;
+
+ case SNDCTL_DSP_SETDUPLEX:
+ return 0;
+
+ case SNDCTL_DSP_GETCAPS:
+ return put_user(DSP_CAP_DUPLEX | DSP_CAP_REALTIME |
+ DSP_CAP_TRIGGER | DSP_CAP_MMAP, (int *)arg);
+
+ case SNDCTL_DSP_RESET:
+ if (file->f_mode & FMODE_WRITE) {
+ stop_dac(s);
+ synchronize_irq();
+ s->dma_dac.count = s->dma_dac.total_bytes = 0;
+ s->dma_dac.nextIn = s->dma_dac.nextOut =
+ s->dma_dac.rawbuf;
+ }
+ if (file->f_mode & FMODE_READ) {
+ stop_adc(s);
+ synchronize_irq();
+ s->dma_adc.count = s->dma_adc.total_bytes = 0;
+ s->dma_adc.nextIn = s->dma_adc.nextOut =
+ s->dma_adc.rawbuf;
+ }
+ return 0;
+
+ case SNDCTL_DSP_SPEED:
+ if (get_user(val, (int *) arg))
+ return -EFAULT;
+ if (val >= 0) {
+ if (file->f_mode & FMODE_READ) {
+ stop_adc(s);
+ set_adc_rate(s, val);
+ }
+ if (file->f_mode & FMODE_WRITE) {
+ stop_dac(s);
+ set_dac_rate(s, val);
+ }
+ if (s->open_mode & FMODE_READ)
+ if ((ret = prog_dmabuf_adc(s)))
+ return ret;
+ if (s->open_mode & FMODE_WRITE)
+ if ((ret = prog_dmabuf_dac(s)))
+ return ret;
+ }
+ return put_user((file->f_mode & FMODE_READ) ?
+ s->dma_adc.sample_rate :
+ s->dma_dac.sample_rate,
+ (int *)arg);
+
+ case SNDCTL_DSP_STEREO:
+ if (get_user(val, (int *) arg))
+ return -EFAULT;
+ if (file->f_mode & FMODE_READ) {
+ stop_adc(s);
+ s->dma_adc.num_channels = val ? 2 : 1;
+ if ((ret = prog_dmabuf_adc(s)))
+ return ret;
+ }
+ if (file->f_mode & FMODE_WRITE) {
+ stop_dac(s);
+ s->dma_dac.num_channels = val ? 2 : 1;
+ if (s->codec_ext_caps & AC97_EXT_DACS) {
+ // disable surround and center/lfe in AC'97
+ u16 ext_stat = rdcodec(s->codec,
+ AC97_EXTENDED_STATUS);
+ wrcodec(s->codec, AC97_EXTENDED_STATUS,
+ ext_stat | (AC97_EXTSTAT_PRI |
+ AC97_EXTSTAT_PRJ |
+ AC97_EXTSTAT_PRK));
+ }
+ if ((ret = prog_dmabuf_dac(s)))
+ return ret;
+ }
+ return 0;
+
+ case SNDCTL_DSP_CHANNELS:
+ if (get_user(val, (int *) arg))
+ return -EFAULT;
+ if (val != 0) {
+ if (file->f_mode & FMODE_READ) {
+ if (val < 0 || val > 2)
+ return -EINVAL;
+ stop_adc(s);
+ s->dma_adc.num_channels = val;
+ if ((ret = prog_dmabuf_adc(s)))
+ return ret;
+ }
+ if (file->f_mode & FMODE_WRITE) {
+ switch (val) {
+ case 1:
+ case 2:
+ break;
+ case 3:
+ case 5:
+ return -EINVAL;
+ case 4:
+ if (!(s->codec_ext_caps &
+ AC97_EXTID_SDAC))
+ return -EINVAL;
+ break;
+ case 6:
+ if ((s->codec_ext_caps &
+ AC97_EXT_DACS) != AC97_EXT_DACS)
+ return -EINVAL;
+ break;
+ default:
+ return -EINVAL;
+ }
+
+ stop_dac(s);
+ if (val <= 2 &&
+ (s->codec_ext_caps & AC97_EXT_DACS)) {
+ // disable surround and center/lfe
+ // channels in AC'97
+ u16 ext_stat =
+ rdcodec(s->codec,
+ AC97_EXTENDED_STATUS);
+ wrcodec(s->codec,
+ AC97_EXTENDED_STATUS,
+ ext_stat | (AC97_EXTSTAT_PRI |
+ AC97_EXTSTAT_PRJ |
+ AC97_EXTSTAT_PRK));
+ } else if (val >= 4) {
+ // enable surround, center/lfe
+ // channels in AC'97
+ u16 ext_stat =
+ rdcodec(s->codec,
+ AC97_EXTENDED_STATUS);
+ ext_stat &= ~AC97_EXTSTAT_PRJ;
+ if (val == 6)
+ ext_stat &=
+ ~(AC97_EXTSTAT_PRI |
+ AC97_EXTSTAT_PRK);
+ wrcodec(s->codec,
+ AC97_EXTENDED_STATUS,
+ ext_stat);
+ }
+
+ s->dma_dac.num_channels = val;
+ if ((ret = prog_dmabuf_dac(s)))
+ return ret;
+ }
+ }
+ return put_user(val, (int *) arg);
+
+ case SNDCTL_DSP_GETFMTS: /* Returns a mask */
+ return put_user(AFMT_S16_LE | AFMT_U8, (int *) arg);
+
+ case SNDCTL_DSP_SETFMT: /* Selects ONE fmt */
+ if (get_user(val, (int *) arg))
+ return -EFAULT;
+ if (val != AFMT_QUERY) {
+ if (file->f_mode & FMODE_READ) {
+ stop_adc(s);
+ if (val == AFMT_S16_LE)
+ s->dma_adc.sample_size = 16;
+ else {
+ val = AFMT_U8;
+ s->dma_adc.sample_size = 8;
+ }
+ if ((ret = prog_dmabuf_adc(s)))
+ return ret;
+ }
+ if (file->f_mode & FMODE_WRITE) {
+ stop_dac(s);
+ if (val == AFMT_S16_LE)
+ s->dma_dac.sample_size = 16;
+ else {
+ val = AFMT_U8;
+ s->dma_dac.sample_size = 8;
+ }
+ if ((ret = prog_dmabuf_dac(s)))
+ return ret;
+ }
+ } else {
+ if (file->f_mode & FMODE_READ)
+ val = (s->dma_adc.sample_size == 16) ?
+ AFMT_S16_LE : AFMT_U8;
+ else
+ val = (s->dma_dac.sample_size == 16) ?
+ AFMT_S16_LE : AFMT_U8;
+ }
+ return put_user(val, (int *) arg);
+
+ case SNDCTL_DSP_POST:
+ return 0;
+
+ case SNDCTL_DSP_GETTRIGGER:
+ val = 0;
+ spin_lock_irqsave(&s->lock, flags);
+ if (file->f_mode & FMODE_READ && !s->dma_adc.stopped)
+ val |= PCM_ENABLE_INPUT;
+ if (file->f_mode & FMODE_WRITE && !s->dma_dac.stopped)
+ val |= PCM_ENABLE_OUTPUT;
+ spin_unlock_irqrestore(&s->lock, flags);
+ return put_user(val, (int *) arg);
+
+ case SNDCTL_DSP_SETTRIGGER:
+ if (get_user(val, (int *) arg))
+ return -EFAULT;
+ if (file->f_mode & FMODE_READ) {
+ if (val & PCM_ENABLE_INPUT)
+ start_adc(s);
+ else
+ stop_adc(s);
+ }
+ if (file->f_mode & FMODE_WRITE) {
+ if (val & PCM_ENABLE_OUTPUT)
+ start_dac(s);
+ else
+ stop_dac(s);
+ }
+ return 0;
+
+ case SNDCTL_DSP_GETOSPACE:
+ if (!(file->f_mode & FMODE_WRITE))
+ return -EINVAL;
+ abinfo.fragsize = s->dma_dac.fragsize;
+ spin_lock_irqsave(&s->lock, flags);
+ count = s->dma_dac.count;
+ count -= dma_count_done(&s->dma_dac);
+ spin_unlock_irqrestore(&s->lock, flags);
+ if (count < 0)
+ count = 0;
+ abinfo.bytes = (s->dma_dac.dmasize - count) /
+ s->dma_dac.cnt_factor;
+ abinfo.fragstotal = s->dma_dac.numfrag;
+ abinfo.fragments = abinfo.bytes >> s->dma_dac.fragshift;
+#ifdef AU1000_VERBOSE_DEBUG
+ dbg("bytes=%d, fragments=%d", abinfo.bytes, abinfo.fragments);
+#endif
+ return copy_to_user((void *) arg, &abinfo,
+ sizeof(abinfo)) ? -EFAULT : 0;
+
+ case SNDCTL_DSP_GETISPACE:
+ if (!(file->f_mode & FMODE_READ))
+ return -EINVAL;
+ abinfo.fragsize = s->dma_adc.fragsize;
+ spin_lock_irqsave(&s->lock, flags);
+ count = s->dma_adc.count;
+ count += dma_count_done(&s->dma_adc);
+ spin_unlock_irqrestore(&s->lock, flags);
+ if (count < 0)
+ count = 0;
+ abinfo.bytes = count / s->dma_adc.cnt_factor;
+ abinfo.fragstotal = s->dma_adc.numfrag;
+ abinfo.fragments = abinfo.bytes >> s->dma_adc.fragshift;
+ return copy_to_user((void *) arg, &abinfo,
+ sizeof(abinfo)) ? -EFAULT : 0;
+
+ case SNDCTL_DSP_NONBLOCK:
+ file->f_flags |= O_NONBLOCK;
+ return 0;
+
+ case SNDCTL_DSP_GETODELAY:
+ if (!(file->f_mode & FMODE_WRITE))
+ return -EINVAL;
+ spin_lock_irqsave(&s->lock, flags);
+ count = s->dma_dac.count;
+ count -= dma_count_done(&s->dma_dac);
+ spin_unlock_irqrestore(&s->lock, flags);
+ if (count < 0)
+ count = 0;
+ count /= s->dma_dac.cnt_factor;
+ return put_user(count, (int *) arg);
+
+ case SNDCTL_DSP_GETIPTR:
+ if (!(file->f_mode & FMODE_READ))
+ return -EINVAL;
+ spin_lock_irqsave(&s->lock, flags);
+ cinfo.bytes = s->dma_adc.total_bytes;
+ count = s->dma_adc.count;
+ if (!s->dma_adc.stopped) {
+ diff = dma_count_done(&s->dma_adc);
+ count += diff;
+ cinfo.bytes += diff;
+ cinfo.ptr = virt_to_phys(s->dma_adc.nextIn) + diff -
+ s->dma_adc.dmaaddr;
+ } else
+ cinfo.ptr = virt_to_phys(s->dma_adc.nextIn) -
+ s->dma_adc.dmaaddr;
+ if (s->dma_adc.mapped)
+ s->dma_adc.count &= (s->dma_adc.dma_fragsize-1);
+ spin_unlock_irqrestore(&s->lock, flags);
+ if (count < 0)
+ count = 0;
+ cinfo.blocks = count >> s->dma_adc.fragshift;
+ return copy_to_user((void *) arg, &cinfo, sizeof(cinfo));
+
+ case SNDCTL_DSP_GETOPTR:
+ if (!(file->f_mode & FMODE_READ))
+ return -EINVAL;
+ spin_lock_irqsave(&s->lock, flags);
+ cinfo.bytes = s->dma_dac.total_bytes;
+ count = s->dma_dac.count;
+ if (!s->dma_dac.stopped) {
+ diff = dma_count_done(&s->dma_dac);
+ count -= diff;
+ cinfo.bytes += diff;
+ cinfo.ptr = virt_to_phys(s->dma_dac.nextOut) + diff -
+ s->dma_dac.dmaaddr;
+ } else
+ cinfo.ptr = virt_to_phys(s->dma_dac.nextOut) -
+ s->dma_dac.dmaaddr;
+ if (s->dma_dac.mapped)
+ s->dma_dac.count &= (s->dma_dac.dma_fragsize-1);
+ spin_unlock_irqrestore(&s->lock, flags);
+ if (count < 0)
+ count = 0;
+ cinfo.blocks = count >> s->dma_dac.fragshift;
+ return copy_to_user((void *) arg, &cinfo, sizeof(cinfo));
+
+ case SNDCTL_DSP_GETBLKSIZE:
+ if (file->f_mode & FMODE_WRITE)
+ return put_user(s->dma_dac.fragsize, (int *) arg);
+ else
+ return put_user(s->dma_adc.fragsize, (int *) arg);
+
+ case SNDCTL_DSP_SETFRAGMENT:
+ if (get_user(val, (int *) arg))
+ return -EFAULT;
+ if (file->f_mode & FMODE_READ) {
+ stop_adc(s);
+ s->dma_adc.ossfragshift = val & 0xffff;
+ s->dma_adc.ossmaxfrags = (val >> 16) & 0xffff;
+ if (s->dma_adc.ossfragshift < 4)
+ s->dma_adc.ossfragshift = 4;
+ if (s->dma_adc.ossfragshift > 15)
+ s->dma_adc.ossfragshift = 15;
+ if (s->dma_adc.ossmaxfrags < 4)
+ s->dma_adc.ossmaxfrags = 4;
+ if ((ret = prog_dmabuf_adc(s)))
+ return ret;
+ }
+ if (file->f_mode & FMODE_WRITE) {
+ stop_dac(s);
+ s->dma_dac.ossfragshift = val & 0xffff;
+ s->dma_dac.ossmaxfrags = (val >> 16) & 0xffff;
+ if (s->dma_dac.ossfragshift < 4)
+ s->dma_dac.ossfragshift = 4;
+ if (s->dma_dac.ossfragshift > 15)
+ s->dma_dac.ossfragshift = 15;
+ if (s->dma_dac.ossmaxfrags < 4)
+ s->dma_dac.ossmaxfrags = 4;
+ if ((ret = prog_dmabuf_dac(s)))
+ return ret;
+ }
+ return 0;
+
+ case SNDCTL_DSP_SUBDIVIDE:
+ if ((file->f_mode & FMODE_READ && s->dma_adc.subdivision) ||
+ (file->f_mode & FMODE_WRITE && s->dma_dac.subdivision))
+ return -EINVAL;
+ if (get_user(val, (int *) arg))
+ return -EFAULT;
+ if (val != 1 && val != 2 && val != 4)
+ return -EINVAL;
+ if (file->f_mode & FMODE_READ) {
+ stop_adc(s);
+ s->dma_adc.subdivision = val;
+ if ((ret = prog_dmabuf_adc(s)))
+ return ret;
+ }
+ if (file->f_mode & FMODE_WRITE) {
+ stop_dac(s);
+ s->dma_dac.subdivision = val;
+ if ((ret = prog_dmabuf_dac(s)))
+ return ret;
+ }
+ return 0;
+
+ case SOUND_PCM_READ_RATE:
+ return put_user((file->f_mode & FMODE_READ) ?
+ s->dma_adc.sample_rate :
+ s->dma_dac.sample_rate,
+ (int *)arg);
+
+ case SOUND_PCM_READ_CHANNELS:
+ if (file->f_mode & FMODE_READ)
+ return put_user(s->dma_adc.num_channels, (int *)arg);
+ else
+ return put_user(s->dma_dac.num_channels, (int *)arg);
+
+ case SOUND_PCM_READ_BITS:
+ if (file->f_mode & FMODE_READ)
+ return put_user(s->dma_adc.sample_size, (int *)arg);
+ else
+ return put_user(s->dma_dac.sample_size, (int *)arg);
+
+ case SOUND_PCM_WRITE_FILTER:
+ case SNDCTL_DSP_SETSYNCRO:
+ case SOUND_PCM_READ_FILTER:
+ return -EINVAL;
+ }
+
+ return mixdev_ioctl(s->codec, cmd, arg);
+}
+
+
+static int au1000_open(struct inode *inode, struct file *file)
+{
+ int minor = MINOR(inode->i_rdev);
+ DECLARE_WAITQUEUE(wait, current);
+ struct au1000_state *s = &au1000_state;
+ int ret;
+
+#ifdef AU1000_VERBOSE_DEBUG
+ if (file->f_flags & O_NONBLOCK)
+ dbg(__FUNCTION__ ": non-blocking");
+ else
+ dbg(__FUNCTION__ ": blocking");
+#endif
+
+ file->private_data = s;
+ /* wait for device to become free */
+ down(&s->open_sem);
+ while (s->open_mode & file->f_mode) {
+ if (file->f_flags & O_NONBLOCK) {
+ up(&s->open_sem);
+ return -EBUSY;
+ }
+ add_wait_queue(&s->open_wait, &wait);
+ __set_current_state(TASK_INTERRUPTIBLE);
+ up(&s->open_sem);
+ schedule();
+ remove_wait_queue(&s->open_wait, &wait);
+ set_current_state(TASK_RUNNING);
+ if (signal_pending(current))
+ return -ERESTARTSYS;
+ down(&s->open_sem);
+ }
+
+ stop_dac(s);
+ stop_adc(s);
+
+ if (file->f_mode & FMODE_READ) {
+ s->dma_adc.ossfragshift = s->dma_adc.ossmaxfrags =
+ s->dma_adc.subdivision = s->dma_adc.total_bytes = 0;
+ s->dma_adc.num_channels = 1;
+ s->dma_adc.sample_size = 8;
+ set_adc_rate(s, 8000);
+ if ((minor & 0xf) == SND_DEV_DSP16)
+ s->dma_adc.sample_size = 16;
+ }
+
+ if (file->f_mode & FMODE_WRITE) {
+ s->dma_dac.ossfragshift = s->dma_dac.ossmaxfrags =
+ s->dma_dac.subdivision = s->dma_dac.total_bytes = 0;
+ s->dma_dac.num_channels = 1;
+ s->dma_dac.sample_size = 8;
+ set_dac_rate(s, 8000);
+ if ((minor & 0xf) == SND_DEV_DSP16)
+ s->dma_dac.sample_size = 16;
+ }
+
+ if (file->f_mode & FMODE_READ) {
+ if ((ret = prog_dmabuf_adc(s)))
+ return ret;
+ }
+ if (file->f_mode & FMODE_WRITE) {
+ if ((ret = prog_dmabuf_dac(s)))
+ return ret;
+ }
+
+ s->open_mode |= file->f_mode & (FMODE_READ | FMODE_WRITE);
+ up(&s->open_sem);
+ init_MUTEX(&s->sem);
+ return 0;
+}
+
+static int au1000_release(struct inode *inode, struct file *file)
+{
+ struct au1000_state *s = (struct au1000_state *)file->private_data;
+
+ lock_kernel();
+
+ if (file->f_mode & FMODE_WRITE) {
+ unlock_kernel();
+ drain_dac(s, file->f_flags & O_NONBLOCK);
+ lock_kernel();
+ }
+
+ down(&s->open_sem);
+ if (file->f_mode & FMODE_WRITE) {
+ stop_dac(s);
+ dealloc_dmabuf(s, &s->dma_dac);
+ }
+ if (file->f_mode & FMODE_READ) {
+ stop_adc(s);
+ dealloc_dmabuf(s, &s->dma_adc);
+ }
+ s->open_mode &= ((~file->f_mode) & (FMODE_READ|FMODE_WRITE));
+ up(&s->open_sem);
+ wake_up(&s->open_wait);
+ unlock_kernel();
+ return 0;
+}
+
+static /*const */ struct file_operations au1000_audio_fops = {
+ owner: THIS_MODULE,
+ llseek: au1000_llseek,
+ read: au1000_read,
+ write: au1000_write,
+ poll: au1000_poll,
+ ioctl: au1000_ioctl,
+ mmap: au1000_mmap,
+ open: au1000_open,
+ release: au1000_release,
+};
+
+
+/* --------------------------------------------------------------------- */
+
+
+/* --------------------------------------------------------------------- */
+
+/*
+ * for debugging purposes, we'll create a proc device that dumps the
+ * CODEC chipstate
+ */
+
+#ifdef AU1000_DEBUG
+static int proc_au1000_dump(char *buf, char **start, off_t fpos,
+ int length, int *eof, void *data)
+{
+ struct au1000_state *s = &au1000_state;
+ int cnt, len = 0;
+
+ /* print out header */
+ len += sprintf(buf + len, "\n\t\tAU1000 Audio Debug\n\n");
+
+ // print out digital controller state
+ len += sprintf(buf + len, "AU1000 Audio Controller registers\n");
+ len += sprintf(buf + len, "---------------------------------\n");
+ len += sprintf (buf + len, "AC97C_CONFIG = %08x\n",
+ au_readl(AC97C_CONFIG));
+ len += sprintf (buf + len, "AC97C_STATUS = %08x\n",
+ au_readl(AC97C_STATUS));
+ len += sprintf (buf + len, "AC97C_CNTRL = %08x\n",
+ au_readl(AC97C_CNTRL));
+
+ /* print out CODEC state */
+ len += sprintf(buf + len, "\nAC97 CODEC registers\n");
+ len += sprintf(buf + len, "----------------------\n");
+ for (cnt = 0; cnt <= 0x7e; cnt += 2)
+ len += sprintf(buf + len, "reg %02x = %04x\n",
+ cnt, rdcodec(s->codec, cnt));
+
+ if (fpos >= len) {
+ *start = buf;
+ *eof = 1;
+ return 0;
+ }
+ *start = buf + fpos;
+ if ((len -= fpos) > length)
+ return length;
+ *eof = 1;
+ return len;
+
+}
+#endif /* AU1000_DEBUG */
+
+/* --------------------------------------------------------------------- */
+
+MODULE_AUTHOR("Monta Vista Software, stevel@mvista.com");
+MODULE_DESCRIPTION("Au1000 Audio Driver");
+
+/* --------------------------------------------------------------------- */
+
+static int __devinit au1000_probe(void)
+{
+ struct au1000_state *s = &au1000_state;
+ int val;
+ char proc_str[80];
+
+ memset(s, 0, sizeof(struct au1000_state));
+
+ init_waitqueue_head(&s->dma_adc.wait);
+ init_waitqueue_head(&s->dma_dac.wait);
+ init_waitqueue_head(&s->open_wait);
+ init_MUTEX(&s->open_sem);
+ spin_lock_init(&s->lock);
+
+ s->codec = ac97_alloc_codec();
+ if(s->codec == NULL)
+ {
+ error("Out of memory");
+ return -1;
+ }
+ s->codec->private_data = s;
+ s->codec->id = 0;
+ s->codec->codec_read = rdcodec;
+ s->codec->codec_write = wrcodec;
+ s->codec->codec_wait = waitcodec;
+
+ if (!request_region(virt_to_phys((void *) AC97C_CONFIG),
+ 0x14, AU1000_MODULE_NAME)) {
+ err("AC'97 ports in use");
+ goto err_codec;
+ }
+ // Allocate the DMA Channels
+ if ((s->dma_dac.dmanr = request_au1000_dma(DMA_ID_AC97C_TX,
+ "audio DAC",
+ dac_dma_interrupt,
+ SA_INTERRUPT, s)) < 0) {
+ err("Can't get DAC DMA");
+ goto err_dma1;
+ }
+ if ((s->dma_adc.dmanr = request_au1000_dma(DMA_ID_AC97C_RX,
+ "audio ADC",
+ adc_dma_interrupt,
+ SA_INTERRUPT, s)) < 0) {
+ err("Can't get ADC DMA");
+ goto err_dma2;
+ }
+
+ info("DAC: DMA%d/IRQ%d, ADC: DMA%d/IRQ%d",
+ s->dma_dac.dmanr, get_dma_done_irq(s->dma_dac.dmanr),
+ s->dma_adc.dmanr, get_dma_done_irq(s->dma_adc.dmanr));
+
+#ifdef USE_COHERENT_DMA
+ // enable DMA coherency in read/write DMA channels
+ set_dma_mode(s->dma_dac.dmanr,
+ get_dma_mode(s->dma_dac.dmanr) & ~DMA_NC);
+ set_dma_mode(s->dma_adc.dmanr,
+ get_dma_mode(s->dma_adc.dmanr) & ~DMA_NC);
+#else
+ // disable DMA coherency in read/write DMA channels
+ set_dma_mode(s->dma_dac.dmanr,
+ get_dma_mode(s->dma_dac.dmanr) | DMA_NC);
+ set_dma_mode(s->dma_adc.dmanr,
+ get_dma_mode(s->dma_adc.dmanr) | DMA_NC);
+#endif
+
+ /* register devices */
+
+ if ((s->dev_audio = register_sound_dsp(&au1000_audio_fops, -1)) < 0)
+ goto err_dev1;
+ if ((s->codec->dev_mixer =
+ register_sound_mixer(&au1000_mixer_fops, -1)) < 0)
+ goto err_dev2;
+
+#ifdef AU1000_DEBUG
+ /* intialize the debug proc device */
+ s->ps = create_proc_read_entry(AU1000_MODULE_NAME, 0, NULL,
+ proc_au1000_dump, NULL);
+#endif /* AU1000_DEBUG */
+
+ // configure pins for AC'97
+ au_writel(au_readl(SYS_PINFUNC) & ~0x02, SYS_PINFUNC);
+
+ // Assert reset for 10msec to the AC'97 controller, and enable clock
+ au_writel(AC97C_RS | AC97C_CE, AC97C_CNTRL);
+ au1000_delay(10);
+ au_writel(AC97C_CE, AC97C_CNTRL);
+ au1000_delay(10); // wait for clock to stabilize
+
+ /* cold reset the AC'97 */
+ au_writel(AC97C_RESET, AC97C_CONFIG);
+ au1000_delay(10);
+ au_writel(0, AC97C_CONFIG);
+ /* need to delay around 500msec(bleech) to give
+ some CODECs enough time to wakeup */
+ au1000_delay(500);
+
+ /* warm reset the AC'97 to start the bitclk */
+ au_writel(AC97C_SG | AC97C_SYNC, AC97C_CONFIG);
+ udelay(100);
+ au_writel(0, AC97C_CONFIG);
+
+ /* codec init */
+ if (!ac97_probe_codec(s->codec))
+ goto err_dev3;
+
+ s->codec_base_caps = rdcodec(s->codec, AC97_RESET);
+ s->codec_ext_caps = rdcodec(s->codec, AC97_EXTENDED_ID);
+ info("AC'97 Base/Extended ID = %04x/%04x",
+ s->codec_base_caps, s->codec_ext_caps);
+
+ /*
+ * On the Pb1000, audio playback is on the AUX_OUT
+ * channel (which defaults to LNLVL_OUT in AC'97
+ * rev 2.2) so make sure this channel is listed
+ * as supported (soundcard.h calls this channel
+ * ALTPCM). ac97_codec.c does not handle detection
+ * of this channel correctly.
+ */
+ s->codec->supported_mixers |= SOUND_MASK_ALTPCM;
+ /*
+ * Now set AUX_OUT's default volume.
+ */
+ val = 0x4343;
+ mixdev_ioctl(s->codec, SOUND_MIXER_WRITE_ALTPCM,
+ (unsigned long) &val);
+
+ if (!(s->codec_ext_caps & AC97_EXTID_VRA)) {
+ // codec does not support VRA
+ s->no_vra = 1;
+ } else if (!vra) {
+ // Boot option says disable VRA
+ u16 ac97_extstat = rdcodec(s->codec, AC97_EXTENDED_STATUS);
+ wrcodec(s->codec, AC97_EXTENDED_STATUS,
+ ac97_extstat & ~AC97_EXTSTAT_VRA);
+ s->no_vra = 1;
+ }
+ if (s->no_vra)
+ info("no VRA, interpolating and decimating");
+
+ /* set mic to be the recording source */
+ val = SOUND_MASK_MIC;
+ mixdev_ioctl(s->codec, SOUND_MIXER_WRITE_RECSRC,
+ (unsigned long) &val);
+
+#ifdef AU1000_DEBUG
+ sprintf(proc_str, "driver/%s/%d/ac97", AU1000_MODULE_NAME,
+ s->codec->id);
+ s->ac97_ps = create_proc_read_entry (proc_str, 0, NULL,
+ ac97_read_proc, s->codec);
+#endif
+
+ return 0;
+
+ err_dev3:
+ unregister_sound_mixer(s->codec->dev_mixer);
+ err_dev2:
+ unregister_sound_dsp(s->dev_audio);
+ err_dev1:
+ free_au1000_dma(s->dma_adc.dmanr);
+ err_dma2:
+ free_au1000_dma(s->dma_dac.dmanr);
+ err_dma1:
+ release_region(virt_to_phys((void *) AC97C_CONFIG), 0x14);
+ err_codec:
+ ac97_release_codec(s->codec);
+ return -1;
+}
+
+static void __devinit au1000_remove(void)
+{
+ struct au1000_state *s = &au1000_state;
+
+ if (!s)
+ return;
+#ifdef AU1000_DEBUG
+ if (s->ps)
+ remove_proc_entry(AU1000_MODULE_NAME, NULL);
+#endif /* AU1000_DEBUG */
+ synchronize_irq();
+ free_au1000_dma(s->dma_adc.dmanr);
+ free_au1000_dma(s->dma_dac.dmanr);
+ release_region(virt_to_phys((void *) AC97C_CONFIG), 0x14);
+ unregister_sound_dsp(s->dev_audio);
+ unregister_sound_mixer(s->codec->dev_mixer);
+ ac97_release_codec(s->codec);
+}
+
+static int __init init_au1000(void)
+{
+ info("stevel@mvista.com, built " __TIME__ " on " __DATE__);
+ return au1000_probe();
+}
+
+static void __exit cleanup_au1000(void)
+{
+ info("unloading");
+ au1000_remove();
+}
+
+module_init(init_au1000);
+module_exit(cleanup_au1000);
+
+/* --------------------------------------------------------------------- */
+
+#ifndef MODULE
+
+static int __init au1000_setup(char *options)
+{
+ char *this_opt;
+
+ if (!options || !*options)
+ return 0;
+
+ for(this_opt=strtok(options, ",");
+ this_opt; this_opt=strtok(NULL, ",")) {
+ if (!strncmp(this_opt, "vra", 3)) {
+ vra = 1;
+ }
+ }
+
+ return 1;
+}
+
+__setup("au1000_audio=", au1000_setup);
+
+#endif /* MODULE */
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