/*
* Driver for the Conexant CX25821 PCIe bridge
*
* Copyright (C) 2009 Conexant Systems Inc.
* Authors <hiep.huynh@conexant.com>, <shu.lin@conexant.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 program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
*
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
*/
#include "cx25821-video.h"
#include "cx25821-audio-upstream.h"
#include <linux/fs.h>
#include <linux/errno.h>
#include <linux/kernel.h>
#include <linux/init.h>
#include <linux/module.h>
#include <linux/syscalls.h>
#include <linux/file.h>
#include <linux/fcntl.h>
#include <linux/delay.h>
#include <asm/uaccess.h>
MODULE_DESCRIPTION("v4l2 driver module for cx25821 based TV cards");
MODULE_AUTHOR("Hiep Huynh <hiep.huynh@conexant.com>");
MODULE_LICENSE("GPL");
static int _intr_msk = FLD_AUD_SRC_RISCI1 | FLD_AUD_SRC_OF | FLD_AUD_SRC_SYNC | FLD_AUD_SRC_OPC_ERR;
int cx25821_sram_channel_setup_upstream_audio(struct cx25821_dev *dev,
struct sram_channel *ch,
unsigned int bpl, u32 risc)
{
unsigned int i, lines;
u32 cdt;
if (ch->cmds_start == 0) {
cx_write(ch->ptr1_reg, 0);
cx_write(ch->ptr2_reg, 0);
cx_write(ch->cnt2_reg, 0);
cx_write(ch->cnt1_reg, 0);
return 0;
}
bpl = (bpl + 7) & ~7; /* alignment */
cdt = ch->cdt;
lines = ch->fifo_size / bpl;
if (lines > 3)
{
lines = 3;
}
BUG_ON(lines < 2);
/* write CDT */
for (i = 0; i < lines; i++) {
cx_write(cdt + 16*i, ch->fifo_start + bpl*i);
cx_write(cdt + 16*i + 4, 0);
cx_write(cdt + 16*i + 8, 0);
cx_write(cdt + 16*i + 12, 0);
}
/* write CMDS */
cx_write(ch->cmds_start + 0, risc);
cx_write(ch->cmds_start + 4, 0);
cx_write(ch->cmds_start + 8, cdt);
cx_write(ch->cmds_start + 12, AUDIO_CDT_SIZE_QW);
cx_write(ch->cmds_start + 16, ch->ctrl_start);
//IQ size
cx_write(ch->cmds_start + 20, AUDIO_IQ_SIZE_DW);
for (i = 24; i < 80; i += 4)
cx_write(ch->cmds_start + i, 0);
/* fill registers */
cx_write(ch->ptr1_reg, ch->fifo_start);
cx_write(ch->ptr2_reg, cdt);
cx_write(ch->cnt2_reg, AUDIO_CDT_SIZE_QW);
cx_write(ch->cnt1_reg, AUDIO_CLUSTER_SIZE_QW - 1);
return 0;
}
static __le32 *cx25821_risc_field_upstream_audio( struct cx25821_dev *dev, __le32 *rp,
dma_addr_t databuf_phys_addr,
unsigned int bpl, int fifo_enable)
{
unsigned int line;
struct sram_channel *sram_ch = &dev->sram_channels[dev->_audio_upstream_channel_select];
int offset = 0;
/* scan lines */
for (line = 0; line < LINES_PER_AUDIO_BUFFER; line++)
{
*(rp++) = cpu_to_le32(RISC_READ|RISC_SOL|RISC_EOL|bpl);
*(rp++) = cpu_to_le32(databuf_phys_addr + offset);
*(rp++) = cpu_to_le32(0); /* bits 63-32 */
// Check if we need to enable the FIFO after the first 3 lines
// For the upstream audio channel, the risc engine will enable the FIFO.
if ( fifo_enable && line == 2 )
{
*(rp++) = RISC_WRITECR;
*(rp++) = sram_ch->dma_ctl;
*(rp++) = sram_ch->fld_aud_fifo_en;
*(rp++) = 0x00000020;
}
offset += AUDIO_LINE_SIZE;
}
return rp;
}
int cx25821_risc_buffer_upstream_audio( struct cx25821_dev *dev,
struct pci_dev *pci,
unsigned int bpl, unsigned int lines)
{
__le32 *rp;
int fifo_enable = 0;
int frame = 0, i = 0;
int frame_size = AUDIO_DATA_BUF_SZ;
int databuf_offset = 0;
int risc_flag = RISC_CNT_INC;
dma_addr_t risc_phys_jump_addr;
/* Virtual address of Risc buffer program */
rp = dev->_risc_virt_addr;
/* sync instruction */
*(rp++) = cpu_to_le32(RISC_RESYNC | AUDIO_SYNC_LINE);
for( frame = 0; frame < NUM_AUDIO_FRAMES; frame++ )
{
databuf_offset = frame_size * frame;
if( frame == 0 )
{
fifo_enable = 1;
risc_flag = RISC_CNT_RESET;
}
else
{
fifo_enable = 0;
risc_flag = RISC_CNT_INC;
}
//Calculate physical jump address
if( (frame+1) == NUM_AUDIO_FRAMES )
{
risc_phys_jump_addr = dev->_risc_phys_start_addr + RISC_SYNC_INSTRUCTION_SIZE;
}
else
{
risc_phys_jump_addr = dev->_risc_phys_start_addr + RISC_SYNC_INSTRUCTION_SIZE + AUDIO_RISC_DMA_BUF_SIZE*(frame+1);
}
rp = cx25821_risc_field_upstream_audio(dev, rp, dev->_audiodata_buf_phys_addr+databuf_offset, bpl, fifo_enable);
if( USE_RISC_NOOP_AUDIO )
{
for( i = 0; i < NUM_NO_OPS; i++ )
{
*(rp++) = cpu_to_le32(RISC_NOOP);
}
}
// Loop to (Nth)FrameRISC or to Start of Risc program & generate IRQ
*(rp++) = cpu_to_le32(RISC_JUMP|RISC_IRQ1|risc_flag);
*(rp++) = cpu_to_le32(risc_phys_jump_addr);
*(rp++) = cpu_to_le32(0);
//Recalculate virtual address based on frame index
rp = dev->_risc_virt_addr + RISC_SYNC_INSTRUCTION_SIZE/4 + (AUDIO_RISC_DMA_BUF_SIZE*(frame+1)/4 ) ;
}
return 0;
}
void cx25821_free_memory_audio(struct cx25821_dev *dev)
{
if (dev->_risc_virt_addr)
{
pci_free_consistent(dev->pci, dev->_audiorisc_size, dev->_risc_virt_addr, dev->_risc_phys_addr);
dev->_risc_virt_addr = NULL;
}
if (dev->_audiodata_buf_virt_addr)
{
pci_free_consistent(dev->pci, dev->_audiodata_buf_size, dev->_audiodata_buf_virt_addr, dev->_audiodata_buf_phys_addr);
dev->_audiodata_buf_virt_addr = NULL;
}
}
void cx25821_stop_upstream_audio(struct cx25821_dev *dev)
{
struct sram_channel *sram_ch = &dev->sram_channels[AUDIO_UPSTREAM_SRAM_CHANNEL_B];
u32 tmp = 0;
if( !dev->_audio_is_running )
{
printk("cx25821: No audio file is currently running so return!\n");
return;
}
//Disable RISC interrupts
cx_write( sram_ch->int_msk, 0 );
//Turn OFF risc and fifo enable in AUD_DMA_CNTRL
tmp = cx_read( sram_ch->dma_ctl );
cx_write( sram_ch->dma_ctl, tmp & ~(sram_ch->fld_aud_fifo_en | sram_ch->fld_aud_risc_en) );
//Clear data buffer memory
if( dev->_audiodata_buf_virt_addr )
memset( dev->_audiodata_buf_virt_addr, 0, dev->_audiodata_buf_size );
dev->_audio_is_running = 0;
dev->_is_first_audio_frame = 0;
dev->_audioframe_count = 0;
dev->_audiofile_status = END_OF_FILE;
if( dev->_irq_audio_queues )
{
kfree(dev->_irq_audio_queues);
dev->_irq_audio_queues = NULL;
}
if( dev->_audiofilename != NULL )
kfree(dev->_audiofilename);
}
void cx25821_free_mem_upstream_audio(struct cx25821_dev *dev)
{
if( dev->_audio_is_running )
{
cx25821_stop_upstream_audio(dev);
}
cx25821_free_memory_audio(dev);
}
int cx25821_get_audio_data(struct cx25821_dev *dev, struct sram_channel *sram_ch )
{
struct file * myfile;
int frame_index_temp = dev->_audioframe_index;
int i = 0;
int line_size = AUDIO_LINE_SIZE;
int frame_size = AUDIO_DATA_BUF_SZ;
int frame_offset = frame_size * frame_index_temp;
ssize_t vfs_read_retval = 0;
char mybuf[line_size];
loff_t file_offset = dev->_audioframe_count * frame_size;
loff_t pos;
mm_segment_t old_fs;
if( dev->_audiofile_status == END_OF_FILE )
return 0;
myfile = filp_open( dev->_audiofilename, O_RDONLY | O_LARGEFILE, 0 );
if (IS_ERR(myfile))
{
const int open_errno = -PTR_ERR(myfile);
printk("%s(): ERROR opening file(%s) with errno = %d! \n", __func__, dev->_audiofilename, open_errno);
return PTR_ERR(myfile);
}
else
{
if( !(myfile->f_op) )
{
printk("%s: File has no file operations registered!\n", __func__);
filp_close(myfile, NULL);
return -EIO;
}
if( !myfile->f_op->read )
{
printk("%s: File has no READ operations registered! \n", __func__);
filp_close(myfile, NULL);
return -EIO;
}
pos = myfile->f_pos;
old_fs = get_fs();
set_fs(KERNEL_DS);
for( i = 0; i < dev->_audio_lines_count; i++ )
{
pos = file_offset;
vfs_read_retval = vfs_read(myfile, mybuf, line_size, &pos);
if( vfs_read_retval > 0 && vfs_read_retval == line_size && dev->_audiodata_buf_virt_addr != NULL )
{
memcpy( (void*)(dev->_audiodata_buf_virt_addr+frame_offset/4), mybuf, vfs_read_retval);
}
file_offset += vfs_read_retval;
frame_offset += vfs_read_retval;
if( vfs_read_retval < line_size )
{
printk(KERN_INFO "Done: exit %s() since no more bytes to read from Audio file.\n", __func__ );
break;
}
}
if( i > 0 )
dev->_audioframe_count++;
dev->_audiofile_status = (vfs_read_retval == line_size) ? IN_PROGRESS : END_OF_FILE;
set_fs(old_fs);
filp_close(myfile, NULL);
}
return 0;
}
static void cx25821_audioups_handler(struct work_struct *work)
{
struct cx25821_dev *dev = container_of(work, struct cx25821_dev, _audio_work_entry);
if( !dev )
{
printk("ERROR %s(): since container_of(work_struct) FAILED! \n", __func__ );
return;
}
cx25821_get_audio_data( dev, &dev->sram_channels[dev->_audio_upstream_channel_select] );
}
int cx25821_openfile_audio(struct cx25821_dev *dev, struct sram_channel *sram_ch)
{
struct file * myfile;
int i = 0, j = 0;
int line_size = AUDIO_LINE_SIZE;
ssize_t vfs_read_retval = 0;
char mybuf[line_size];
loff_t pos;
loff_t offset = (unsigned long)0;
mm_segment_t old_fs;
myfile = filp_open( dev->_audiofilename, O_RDONLY | O_LARGEFILE, 0 );
if (IS_ERR(myfile))
{
const int open_errno = -PTR_ERR(myfile);
printk("%s(): ERROR opening file(%s) with errno = %d! \n", __func__, dev->_audiofilename, open_errno);
return PTR_ERR(myfile);
}
else
{
if( !(myfile->f_op) )
{
printk("%s: File has no file operations registered! \n", __func__);
filp_close(myfile, NULL);
return -EIO;
}
if( !myfile->f_op->read )
{
printk("%s: File has no READ operations registered! \n", __func__);
filp_close(myfile, NULL);
return -EIO;
}
pos = myfile->f_pos;
old_fs = get_fs();
set_fs(KERNEL_DS);
for( j = 0; j < NUM_AUDIO_FRAMES; j++ )
{
for( i = 0; i < dev->_audio_lines_count; i++ )
{
pos = offset;
vfs_read_retval = vfs_read(myfile, mybuf, line_size, &pos);
if( vfs_read_retval > 0 && vfs_read_retval == line_size && dev->_audiodata_buf_virt_addr != NULL )
{
memcpy( (void*)(dev->_audiodata_buf_virt_addr+offset/4), mybuf, vfs_read_retval);
}
offset += vfs_read_retval;
if( vfs_read_retval < line_size )
{
printk(KERN_INFO "Done: exit %s() since no more bytes to read from Audio file.\n", __func__ );
break;
}
}
if( i > 0 )
{
dev->_audioframe_count++;
}
if( vfs_read_retval < line_size )
{
break;
}
}
dev->_audiofile_status = (vfs_read_retval == line_size) ? IN_PROGRESS : END_OF_FILE;
set_fs(old_fs);
myfile->f_pos = 0;
filp_close(myfile, NULL);
}
return 0;
}
static int cx25821_audio_upstream_buffer_prepare(struct cx25821_dev *dev,
struct sram_channel *sram_ch,
int bpl)
{
int ret = 0;
dma_addr_t dma_addr;
dma_addr_t data_dma_addr;
cx25821_free_memory_audio(dev);
dev->_risc_virt_addr = pci_alloc_consistent(dev->pci, dev->audio_upstream_riscbuf_size, &dma_addr);
dev->_risc_virt_start_addr = dev->_risc_virt_addr;
dev->_risc_phys_start_addr = dma_addr;
dev->_risc_phys_addr = dma_addr;
dev->_audiorisc_size = dev->audio_upstream_riscbuf_size;
if (!dev->_risc_virt_addr)
{
printk("cx25821 ERROR: pci_alloc_consistent() FAILED to allocate memory for RISC program! Returning.\n");
return -ENOMEM;
}
//Clear out memory at address
memset( dev->_risc_virt_addr, 0, dev->_audiorisc_size );
//For Audio Data buffer allocation
dev->_audiodata_buf_virt_addr = pci_alloc_consistent(dev->pci, dev->audio_upstream_databuf_size, &data_dma_addr);
dev->_audiodata_buf_phys_addr = data_dma_addr;
dev->_audiodata_buf_size = dev->audio_upstream_databuf_size;
if (!dev->_audiodata_buf_virt_addr)
{
printk("cx25821 ERROR: pci_alloc_consistent() FAILED to allocate memory for data buffer! Returning. \n");
return -ENOMEM;
}
//Clear out memory at address
memset( dev->_audiodata_buf_virt_addr, 0, dev->_audiodata_buf_size );
ret = cx25821_openfile_audio(dev, sram_ch);
if( ret < 0 )
return ret;
//Creating RISC programs
ret = cx25821_risc_buffer_upstream_audio(dev, dev->pci, bpl, dev->_audio_lines_count );
if (ret < 0)
{
printk(KERN_DEBUG "cx25821 ERROR creating audio upstream RISC programs! \n");
goto error;
}
return 0;
error:
return ret;
}
int cx25821_audio_upstream_irq(struct cx25821_dev *dev, int chan_num, u32 status)
{
int i = 0;
u32 int_msk_tmp;
struct sram_channel *channel = &dev->sram_channels[chan_num];
dma_addr_t risc_phys_jump_addr;
__le32 * rp;
if (status & FLD_AUD_SRC_RISCI1)
{
//Get interrupt_index of the program that interrupted
u32 prog_cnt = cx_read( channel->gpcnt );
//Since we've identified our IRQ, clear our bits from the interrupt mask and interrupt status registers
cx_write(channel->int_msk, 0);
cx_write(channel->int_stat, cx_read(channel->int_stat) );
spin_lock(&dev->slock);
while(prog_cnt != dev->_last_index_irq)
{
//Update _last_index_irq
if(dev->_last_index_irq < (NUMBER_OF_PROGRAMS-1))
{
dev->_last_index_irq++;
}
else
{
dev->_last_index_irq = 0;
}
dev->_audioframe_index = dev->_last_index_irq;
queue_work(dev->_irq_audio_queues, &dev->_audio_work_entry);
}
if ( dev->_is_first_audio_frame )
{
dev->_is_first_audio_frame = 0;
if( dev->_risc_virt_start_addr != NULL )
{
risc_phys_jump_addr = dev->_risc_phys_start_addr + RISC_SYNC_INSTRUCTION_SIZE + AUDIO_RISC_DMA_BUF_SIZE;
rp = cx25821_risc_field_upstream_audio(dev, dev->_risc_virt_start_addr+1, dev->_audiodata_buf_phys_addr, AUDIO_LINE_SIZE, FIFO_DISABLE);
if( USE_RISC_NOOP_AUDIO )
{
for( i = 0; i < NUM_NO_OPS; i++ )
{
*(rp++) = cpu_to_le32(RISC_NOOP);
}
}
// Jump to 2nd Audio Frame
*(rp++) = cpu_to_le32(RISC_JUMP | RISC_IRQ1 | RISC_CNT_RESET);
*(rp++) = cpu_to_le32(risc_phys_jump_addr);
*(rp++) = cpu_to_le32(0);
}
}
spin_unlock(&dev->slock);
}
else
{
if(status & FLD_AUD_SRC_OF)
printk("%s: Audio Received Overflow Error Interrupt!\n", __func__);
if(status & FLD_AUD_SRC_SYNC)
printk("%s: Audio Received Sync Error Interrupt!\n", __func__);
if(status & FLD_AUD_SRC_OPC_ERR)
printk("%s: Audio Received OpCode Error Interrupt!\n", __func__);
// Read and write back the interrupt status register to clear our bits
cx_write(channel->int_stat, cx_read(channel->int_stat) );
}
if( dev->_audiofile_status == END_OF_FILE )
{
printk("cx25821: EOF Channel Audio Framecount = %d\n", dev->_audioframe_count );
return -1;
}
//ElSE, set the interrupt mask register, re-enable irq.
int_msk_tmp = cx_read( channel->int_msk );
cx_write( channel->int_msk, int_msk_tmp |= _intr_msk );
return 0;
}
static irqreturn_t cx25821_upstream_irq_audio(int irq, void *dev_id)
{
struct cx25821_dev *dev = dev_id;
u32 msk_stat, audio_status;
int handled = 0;
struct sram_channel *sram_ch;
if( !dev )
return -1;
sram_ch = &dev->sram_channels[dev->_audio_upstream_channel_select];
msk_stat = cx_read(sram_ch->int_mstat);
audio_status = cx_read(sram_ch->int_stat);
// Only deal with our interrupt
if(audio_status)
{
handled = cx25821_audio_upstream_irq(dev, dev->_audio_upstream_channel_select, audio_status);
}
if( handled < 0 )
{
cx25821_stop_upstream_audio(dev);
}
else
{
handled += handled;
}
return IRQ_RETVAL(handled);
}
static void cx25821_wait_fifo_enable(struct cx25821_dev *dev, struct sram_channel *sram_ch)
{
int count = 0;
u32 tmp;
do
{
//Wait 10 microsecond before checking to see if the FIFO is turned ON.
udelay(10);
tmp = cx_read( sram_ch->dma_ctl );
if(count++ > 1000) //10 millisecond timeout
{
printk("cx25821 ERROR: %s() fifo is NOT turned on. Timeout!\n", __func__);
return;
}
} while( !(tmp & sram_ch->fld_aud_fifo_en) );
}
int cx25821_start_audio_dma_upstream(struct cx25821_dev *dev,
struct sram_channel *sram_ch)
{
u32 tmp = 0;
int err = 0;
// Set the physical start address of the RISC program in the initial program counter(IPC) member of the CMDS.
cx_write(sram_ch->cmds_start + 0, dev->_risc_phys_addr);
cx_write(sram_ch->cmds_start + 4, 0); /* Risc IPC High 64 bits 63-32 */
/* reset counter */
cx_write(sram_ch->gpcnt_ctl, 3);
//Set the line length (It looks like we do not need to set the line length)
cx_write(sram_ch->aud_length, AUDIO_LINE_SIZE & FLD_AUD_DST_LN_LNGTH);
//Set the input mode to 16-bit
tmp = cx_read( sram_ch->aud_cfg );
tmp |= FLD_AUD_SRC_ENABLE | FLD_AUD_DST_PK_MODE | FLD_AUD_CLK_ENABLE | FLD_AUD_MASTER_MODE | FLD_AUD_CLK_SELECT_PLL_D | FLD_AUD_SONY_MODE;
cx_write( sram_ch->aud_cfg, tmp );
// Read and write back the interrupt status register to clear it
tmp = cx_read( sram_ch->int_stat);
cx_write( sram_ch->int_stat, tmp);
// Clear our bits from the interrupt status register.
cx_write( sram_ch->int_stat, _intr_msk );
//Set the interrupt mask register, enable irq.
cx_set(PCI_INT_MSK, cx_read(PCI_INT_MSK) | (1 << sram_ch->irq_bit));
tmp = cx_read( sram_ch->int_msk );
cx_write( sram_ch->int_msk, tmp |= _intr_msk );
err = request_irq(dev->pci->irq, cx25821_upstream_irq_audio, IRQF_SHARED | IRQF_DISABLED, dev->name, dev);
if (err < 0)
{
printk(KERN_ERR "%s: can't get upstream IRQ %d\n", dev->name, dev->pci->irq);
goto fail_irq;
}
// Start the DMA engine
tmp = cx_read( sram_ch->dma_ctl );
cx_set( sram_ch->dma_ctl, tmp | sram_ch->fld_aud_risc_en );
dev->_audio_is_running = 1;
dev->_is_first_audio_frame = 1;
// The fifo_en bit turns on by the first Risc program
cx25821_wait_fifo_enable(dev, sram_ch);
return 0;
fail_irq:
cx25821_dev_unregister(dev);
return err;
}
int cx25821_audio_upstream_init(struct cx25821_dev *dev, int channel_select)
{
struct sram_channel *sram_ch;
int retval = 0;
int err = 0;
int str_length = 0;
if( dev->_audio_is_running )
{
printk("Audio Channel is still running so return!\n");
return 0;
}
dev->_audio_upstream_channel_select = channel_select;
sram_ch = &dev->sram_channels[channel_select];
//Work queue
INIT_WORK(&dev->_audio_work_entry, cx25821_audioups_handler);
dev->_irq_audio_queues = create_singlethread_workqueue("cx25821_audioworkqueue");
if(!dev->_irq_audio_queues)
{
printk("cx25821 ERROR: create_singlethread_workqueue() for Audio FAILED!\n");
return -ENOMEM;
}
dev->_last_index_irq = 0;
dev->_audio_is_running = 0;
dev->_audioframe_count = 0;
dev->_audiofile_status = RESET_STATUS;
dev->_audio_lines_count = LINES_PER_AUDIO_BUFFER;
_line_size = AUDIO_LINE_SIZE;
if( dev->input_audiofilename )
{
str_length = strlen(dev->input_audiofilename);
dev->_audiofilename = (char *) kmalloc(str_length + 1, GFP_KERNEL);
if( !dev->_audiofilename )
goto error;
memcpy(dev->_audiofilename, dev->input_audiofilename, str_length + 1);
//Default if filename is empty string
if( strcmp(dev->input_audiofilename,"") == 0)
{
dev->_audiofilename = "/root/audioGOOD.wav";
}
}
else
{
str_length = strlen(_defaultAudioName);
dev->_audiofilename = (char *) kmalloc(str_length + 1, GFP_KERNEL);
if( !dev->_audiofilename )
goto error;
memcpy(dev->_audiofilename, _defaultAudioName, str_length + 1);
}
retval = cx25821_sram_channel_setup_upstream_audio(dev, sram_ch, _line_size, 0);
dev->audio_upstream_riscbuf_size = AUDIO_RISC_DMA_BUF_SIZE * NUM_AUDIO_PROGS + RISC_SYNC_INSTRUCTION_SIZE;
dev->audio_upstream_databuf_size = AUDIO_DATA_BUF_SZ * NUM_AUDIO_PROGS;
//Allocating buffers and prepare RISC program
retval = cx25821_audio_upstream_buffer_prepare(dev, sram_ch, _line_size);
if (retval < 0)
{
printk(KERN_ERR "%s: Failed to set up Audio upstream buffers!\n", dev->name);
goto error;
}
//Start RISC engine
cx25821_start_audio_dma_upstream(dev, sram_ch);
return 0;
error:
cx25821_dev_unregister(dev);
return err;
}