industrialNETworX

some problem I meet:
I have a big global audio data array : static u8 WindowsXP_Wav[243552] ={}
in my application program ,I must send it to my SPI codec, I use write(fd,WindowsXP_Wav,243552) write the data to my driver in the application program.
in my driver module I allocate a area 60 pages in the __init function
paudio_data=(void *)vmalloc(60);
memset(paudio_data,0,60);
In driver module "write function" I use "copy_from_user " copy the data from user space application :
if(copy_from_user(paudio_data,buf,243552))
{
return -EFAULT;
}
then I boot the system run my application program, the report like this
./spi_ctrl_wl
1 device file ope[ 44.850000] spi_codec driver file open ok
n
[ 44.850000] Unable to handle kernel paging request at virtual address c485c000
[ 44.860000] pgd = c07f0000
[ 44.860000] [c485c000] *pgd=804ab011, *pte=00000000, *ppte=00000000
[ 44.870000] Internal error: Oops: 807 [#1]
[ 44.870000] Modules linked in:
[ 44.870000] CPU: 0 Tainted: GF (2.6.23.1-rt5-ptx3-netx2 #130)
[ 44.870000] PC is at __copy_from_user+0x70/0x3b0
[ 44.870000] LR is at 0x6308cf
[ 44.870000] pc : [] lr : [<006308cf>] psr: 20000013
[ 44.870000] sp : c3559f14 ip : fe130962 fp : c3559f44
[ 44.870000] r10: 00000000 r9 : c3558000 r8 : fc2d08d7
[ 44.870000] r7 : fafe0738 r6 : fa820477 r5 : faab00c4 r4 : fb64fcfa
[ 44.870000] r3 : fc87f9c4 r2 : 0003a6c0 r1 : 0000960c r0 : c485c000
[ 44.870000] Flags: nzCv IRQs on FIQs on Mode SVC_32 ISA ARM Segment user
[ 44.870000] Control: 0005317f Table: 807f0000 DAC: 00000015
[ 44.870000] Process spi_ctrl_wl (pid: 950, stack limit = 0xc3558260)
[ 44.870000] Stack: (0xc3559f14 to 0xc355a000)
[ 44.870000] 9f00: 000085ec c3559f78 0003b760
[ 44.870000] 9f20: c3558000 c485b000 0003b760 00000000 c07e3000 c01f9784 c3559f74 c3559f48
[ 44.870000] 9f40: c009517c c01f9750 00000003 00000020 c353b000 c07e3000 fffffff7 00000000
[ 44.870000] 9f60: 00000000 c0027fc8 c3559fa4 c3559f78 c00958c4 c00950ac 00000000 00000000
[ 44.870000] 9f80: 00000005 00000000 40023db8 00000000 00000000 00000004 00000000 c3559fa8
[ 44.870000] 9fa0: c0027e20 c0095890 40023db8 00000000 00000003 000085ec 0003b760 00000003
[ 44.870000] 9fc0: 40023db8 00000000 00000000 00000004 00000000 00000000 4013a000 bec96d3c
[ 44.870000] 9fe0: 00000000 bec96d20 000084f0 400d2a7c 60000010 00000003 00000000 00000000
[ 44.870000] Backtrace:
[ 44.870000] [] (spi_codec_write+0x0/0x6c) from [] (vfs_write+0xe0/0x1bc)
[ 44.870000] [] (vfs_write+0x0/0x1bc) from [] (sys_write+0x44/0x74)
[ 44.870000] r8:c0027fc8 r7:00000000 r6:00000000 r5:fffffff7 r4:c07e3000
[ 44.870000] [] (sys_write+0x0/0x74) from [] (ret_fast_syscall+0x0/0x2c)
[ 44.870000] r7:00000004 r6:00000000 r5:00000000 r4:40023db8
[ 44.870000] Code: e4b18004 e4b1c004 e4b1e004 e2522020 (e8a051f8)
[ 45.060000] spi_codec driver release ok
Segmentation fault

how to deal with this problem?? the method copy_from_user can't copy big array??
Thank you!

Oh ,thankyou MT ,I misunderstand the vmalloc I assume it allocate 60 page,however
I set
paudio_data=(void *)vmalloc(245760);
memset(paudio_data,0,245760);
In my test application program I define a global array: unsigned const char WindowsXP_Wav[243552] = {
0x52, 0x49, 0x46, 0x46, 0x58, 0xb7, 0x03, 0x00,............}
then I run it to test my driver , and here is the error,

allocation failed: out of vmalloc space - use vmalloc= to increase size.
[ 163.090000] Unable to handle kernel NULL pointer dereference at virtual address 00000000
[ 163.100000] pgd = c3748000
[ 163.110000] [00000000] *pgd=8374d031, *pte=00000000, *ppte=00000000
[ 163.110000] Internal error: Oops: 17 [#1]
[ 163.110000] Modules linked in:
[ 163.110000] CPU: 0 Tainted: GF (2.6.23.1-rt5-ptx3-netx2 #146)
[ 163.110000] PC is at VsPlaywave+0x310/0x488
[ 163.110000] LR is at 0x0
[ 163.110000] pc : [] lr : [<00000000>] psr: 60000013
[ 163.110000] sp : c36ffef8 ip : c03b03a8 fp : c36fff1c
[ 163.110000] r10: 00000000 r9 : c36fe000 r8 : 00000003
[ 163.110000] r7 : 000323e0 r6 : c06a8c00 r5 : c044b7f8 r4 : 00000020
[ 163.110000] r3 : 00000000 r2 : 00000001 r1 : 00000002 r0 : 00000000
[ 163.110000] Flags: nZCv IRQs on FIQs on Mode SVC_32 ISA ARM Segment user
[ 163.110000] Control: 0005317f Table: 83748000 DAC: 00000015
[ 163.110000] Process play_from_user (pid: 960, stack limit = 0xc36fe260)
[ 163.110000] Stack: (0xc36ffef8 to 0xc3700000)
[ 163.110000] fee0: c044b800 00000001
[ 163.110000] ff00: 00000001 c044b800 00000001 c3c9b5a0 c36fff34 c36fff20 c01fa31c c01f9e38
[ 163.110000] ff20: c3c9b5a0 c01fa2b0 c36fff4c c36fff38 c00a2260 c01fa2c0 c3c9b5a0 00001388
[ 163.110000] ff40: c36fff74 c36fff50 c00a22d4 c00a2204 c36fff74 ffffffff 00001000 00000000
[ 163.110000] ff60: 00001388 00000001 c36fffa4 c36fff78 c00a2584 c00a2278 c002ea40 00000000
[ 163.110000] ff80: c36fffac 40023db8 00000000 00000000 00000036 c0027fc8 00000000 c36fffa8
[ 163.110000] ffa0: c0027e20 c00a2514 40023db8 00000000 00000003 00000001 00001388 00001387
[ 163.110000] ffc0: 40023db8 00000000 00000000 00000036 00000000 00000000 4013a000 beae1d2c
[ 163.110000] ffe0: 00000000 beae1d10 00008554 400d985c 60000010 00000003 80002031 80002431
[ 163.110000] Backtrace:
[ 163.110000] [] (VsPlaywave+0x0/0x488) from [] (spi_codec_ioctl+0x6c/0x84)
[ 163.110000] r7:c3c9b5a0 r6:00000001 r5:c044b800 r4:00000001
[ 163.110000] [] (spi_codec_ioctl+0x0/0x84) from [] (do_ioctl+0x6c/0x74)
[ 163.110000] r5:c01fa2b0 r4:c3c9b5a0
[ 163.110000] [] (do_ioctl+0x0/0x74) from [] (vfs_ioctl+0x6c/0x29c)
[ 163.110000] r5:00001388 r4:c3c9b5a0
[ 163.110000] [] (vfs_ioctl+0x0/0x29c) from [] (sys_ioctl+0x80/0x94)
[ 163.110000] r6:00000001 r5:00001388 r4:00000000
[ 163.110000] [] (sys_ioctl+0x0/0x94) from [] (ret_fast_syscall+0x0/0x2c)
[ 163.110000] r8:c0027fc8 r7:00000036 r6:00000000 r5:00000000 r4:40023db8
[ 163.110000] Code: e59f012c e3a01004 e3a02000 ebf8d5a9 (e5903000)
[ 163.340000] spi_codec driver release ok
Segmentation fault

I allocate big area 250000 the result is the same!

this is my main code:

u8 *paudio_data;
static int spi_test_probe(struct spi_device *spi)
{
p_netx_spi_device=spi;
spi_codec_gpio_init();
spi->mode = SPI_MODE_0;
spi->bits_per_word = 8;
spi->max_speed_hz = 1250000;
(spi->master->setup)(spi);
return 0;
}
the speed of spi is 1.25Mhz ,243552 byte

ssize_t spi_codec_write(struct file *filp,const char __user *buf,size_t count,loff_t *f_pos)
{
if(copy_from_user(paudio_data,buf,243552))
{
return -EFAULT;
} // here is right no error
VsSineTest(p_netx_spi_device);//here is ok
VsPlaywave(p_netx_spi_device);
*f_pos+=count;
return 1;
}

here is the main codec data sending code:
void VsPlaywave(struct spi_device *spi)
{
for(jj=0;jj<243552;jj+=32)
{
Mp3SelectData();
while((pio_in& MP3_DREQ)== 0);
for(i=0;i<32;i++)
{
SPIPutChar(spi, paudio_data);
paudio_data+=1;
}
Mp3DeselectData(); //xDCS = 1
}
printk("&&&&&&send data is over\n");
}

void SPIPutChar(struct spi_device *spi,u8 *c)

{

spi_write(spi, c, 1);

}

static int __init spi_test_init(void)
{
result=spi_register_driver(&spi_test_driver);
paudio_data=(void *)vmalloc(255760);
memset(paudio_data,0,255760);
}

here is the small test application:
int main()
{
int fd;
int n;
printf("1 device file open\n");
fd=open("/dev/spi_codec_wl",O_RDWR|O_NDELAY);
if(fd==-1)
{
printf("fd=%d\n",fd);
perror("fail to open spi_test");
exit(1);
}
write(fd,WindowsXP_Wav,243552);
}

You should read the error message, and not just copy and paste them. vmalloc returns a NULL pointer and you seem to use it in your code.

Regards

MT

Dear MT
I am now transplant the spi_codec char driver to alsa architecture
I view the example of other platform such samsung, blackfin using uda1341 ,both of them use DMA,since there is no DMA in NETX500,
the substream->runtime ->dma_addr is the audio data buffer start ,it is the physical bus address
how Can I use spi_write() to write the audio data start from substream->runtime ->dma_addr to the spi bus

I see the explanation in the LINUX device driver.pdf as follow:
Variables of type dma_addr_t should be treated as opaque by the driver;the only allowable operations are to pass them to the DMA support routines and to the device itself .Aa a bus address ,dma_addr_t may lead to unexpected problems if used directly by the CPU.
how Can I use spi_write() to write the audio data start from substream->runtime ->dma_addr to the spi bus?? The substream audio data address is type of dma_addr_t ,I don't know how to deal it! Can you give me some advice?

and I see the document writing-an-alsa-driver.pdf .I see Chapter 11 .Buffer and Memory Management ->Externel Hardware Buffers
some chips have their own hardware buffers and the DMA transfer from the host memory is not available. In such a case, you need to either
1) copy/set the audio data directly to the external hardwarebuffer, or
2) make an intermediate buffer and copy/set the data from it to the external hardware buffer in interrupts (or in tasklets, preferably).
The first case works fine if the external hardware buffer is enough large. This method doesn’t need any
extra buffers and thus is more effective. You need to define the copy and silence callbacks for the data
transfer.(however My codec buffer is 32B )
static int playback_copy(struct snd_pcm_substream *substream, int channel,
snd_pcm_uframes_t pos, void *src, snd_pcm_uframes_t count);

Is that mean if there is no DMA I must realize the playback_copy?
Thank you ！

Thank you for your reply very much!
now I am try to transplant the alsa-utils-1.0.13 to get the aplay to test my driver,I
have installed the "salsa-lib-0.0.21" to my NFS filesystem successfully ,
My nfs system path is /tftpboot/192.168.1.118,when I go to the folder alsa-utils-1.0.13 and run the following command:
./configure --host=arm-v4t-linux-gnueabi --build=i486-linux --prefix=/tftpboot/192.168.1.118/usr --with-alsa-prefix=/tftpboot/192.168.1.118/lib --with-alsa-inc-prefix=/tftpboot/192.168.1.118/include CPPFLAGS="-I/tftpboot/192.168.1.118/include/alsa -l salsa -I/tftpboot/192.168.1.118/usr/include/ncurses"
It report that:
checking for arm-v4t-linux-gnueabi-gcc... no
checking for gcc... gcc
checking for C compiler default output file name... configure: error: C compiler cannot create executables

It report that no cross-compiler , why there is such error? I compile the salsa-lib-0.0.21,linux kernel all by arm-v4t-linux-gcc ,why It can't be found by alsa-utils-1.0.13?
then I run arm-v4t-linux-gcc -v ,It report like this:
Using built-in specs.
Target: arm-v4t-linux-gnueabi
Configured with: /netxbsp/OSELAS/OSELAS.Toolchain-1.1.1/build-cross/gcc-4.1.2/configure --host=i686-host-linux-gnu --target=arm-v4t-linux-gnueabi --prefix=/opt/OSELAS.Toolchain-1.1.1/arm-v4t-linux-gnueabi/gcc-4.1.2-glibc-2.5-kernel-2.6.18 --with-sysroot=/opt/OSELAS.Toolchain-1.1.1/arm-v4t-linux-gnueabi/gcc-4.1.2-glibc-2.5-kernel-2.6.18/sysroot-arm-v4t-linux-gnueabi --with-arch=armv4t --with-float=soft --with-fpu=vfp --disable-nls --disable-multilib --enable-symvers=gnu --enable-__cxa_atexit --enable-shared --enable-threads=posix --enable-languages=c,c++ --enable-c99 --enable-long-long
Thread model: posix
gcc version 4.1.2
the compiler is ok! What is the problem?

This is basic linux and compiler howto and has nothing to do with netX specific implementation, so it might be wrong in these forums.

But it's quite easy. You write that you are using a replacement alsa (salsa). This comes with the library libsalsa.so and not with libasound.so. See here:

ll /tmp/salsa/lib/
-rw-r--r-- 1 mtrensch users 242240 2009-04-15 09:17 libsalsa.a
-rwxr-xr-x 1 mtrensch users    926 2009-04-15 09:17 libsalsa.la
lrwxrwxrwx 1 mtrensch users     17 2009-04-15 09:17 libsalsa.so -> libsalsa.so.0.0.1
lrwxrwxrwx 1 mtrensch users     17 2009-04-15 09:17 libsalsa.so.0 -> libsalsa.so.0.0.1
-rwxr-xr-x 1 mtrensch users 193177 2009-04-15 09:17 libsalsa.so.0.0.1
drwxr-xr-x 2 mtrensch users   4096 2009-04-15 09:17 pkgconfig

So you will need to tell the configure script to use libsalsa additionally.

Example:
LIBS=-lsalsa ./configure ......

This should always append -lsalsa to every compile procedure. It might not work, as I've not tested it, but you should get an idea what to do.

Or you can do a symlink libasound.so --> libsalsa.so

Regards

MT

As always under linux with configure scripts take a look into config.log. There is a detailed error message where the problem comes from

Regards

MT

I am really starting myself if you really read the documentation of the free to download libraries you are using. You will need to try yourself how to compile a library from the WWW.

When writing drivers for an operating system you won't any reply from the chip developer why your library is not working.
I have done a little research now and have READ the documentation of salsa and alsa-utils, but I won't do this the next time. I've seen now from your postings, that you seem to ignore compiler warnings, etc. You don't look at possible include path, nor do you care about library include pathes/names. If you want to write driver's for open source projects you will need to read their documentation and understand their build environment. Maybe there's even forums and mailing lists on their sites.

Here is a short info how to compile salsa and alsa-utils (You will need to change the pathes, as it was built in a temporary folder):

libsalsa (0.0.21):

export PATH=$PATH:/opt/OSELAS.Toolchain-1.1.1/arm-v4t-linux-gnueabi/gcc-4.1.2-glibc-2.5-kernel-2.6.18/bin
./configure --host=arm-v4t-linux-gnueabi --prefix=/tmp/salsa_arm --enable-libasound --enable-conf --enable-rawmidi --enable-seq --enable-timer
make all install

libncurses (which is needed for alsamixer, i've used version 5.7):

./configure --host=arm-v4t-linux-gnueabi --prefix=/tmp/salsa_arm
make all install

alsa-utils (1.0.19).
NOTE: You will need to remove both references to iecset from Makefile.in, as iecset cannot be built against salsa.

./configure --host=arm-v4t-linux-gnueabi --prefix=/tmp/salsa_arm --with-alsa-prefix=/tmp/salsa_arm/lib --with-alsa-inc-prefix=/tmp/salsa_arm/include CFLAGS=-I/tmp/salsa_arm/include/ncurses
make all install

PS: Next time I will not post any Plug-And-Play solution, for other's peoples projects.

Regards

MT

Dear MT:
I have a question to ask you!
The nxdb500,frequence ,I use timer2 to generate interrupt count every clock cycle
the input clock of netxdb500 is 25Mhz ,what is the frequency of cclk?Where does it define in the linux source file ?

MT:
Oh ,I have seen that in the Data reference guide 2.1 ,
it said that The cpu runs on a 200MHx system clock ,Is that in the situation when the input Oscillator is 25MHz.Is that mean I can't change the system clock? I have never see a cpu do such thing!

Dear MT
I have realize the Alsa driver use the spi codec now!You can introduce VS1003 or VS1053 spi codec to other user who are facing the audio problem because of IIS interface problem with NETX. It can play music successfully ,but a little noise ,because the interrupt interval is a little long.However ,it is enough for our using.I use the kernel timer API,and do not use the timer 2. Thanks to your help!
Now I am trying to write the usb driver.Is there some example in the source which is used by netx? In the source code path driver/usb I do not see a file which have relationship with netx(with prefix name netx ).Can you tell me one ?We need to support the USB HID and USB Mass storage!
I want to use the USB Keyboard with nxdb500 board ,when I run make menuconfig,then choose Device driver->USB support ,It seem that nothing related to netx !

Dear MT
My audio driver has some problem,I need to do the following step to make my driver be effective
mkdir /dev/snd
mknod /dev/snd/pcmC0D0p c 116 16

I see the book LDD chapter 3
The user of a driver that is distributed in the form of a module can invoke such a script from the system’s
rc.local file
however there is no rc.local file in my fils system ,in folder /etc/init.d just these folder:
banner inetd modules networking openssh pure-ftpd rcS telnetd thttpd udev xorg

I edit the file rcS like this:
#!/bin/sh
#
# /etc/init.d/rcS
#
# $Id: rcS 7022 2007-02-28 14:17:06Z jbe $
#

echo -n "mounting filesystems..."
mount -a 2>/dev/null
echo "done."

# modprobe ppp_async
# loadkmap < /etc/boottime.kmap

# set hostname
test -e /etc/hostname && hostname -F /etc/hostname
mkdir /dev/snd
mknod /dev/snd/pcmC0D0p c 116 16
echo "running rc.d services..."
run-parts -a start /etc/rc.d

however when the system boot ,it show these:
[ 12.790000] Freeing init memory: 132K
mounting filesystems...done.
mkdir: cannot create directory '/dev/snd': File exists
mknod: /dev/snd/pcmC0D0p: File exists
running rc.d services...
mounting... ramfs at /dev
creating initial udev device nodes:
making extra nodes
udev startup is finished
loading modules
however when I use root login the netx linux system
cd /dev
there is no /dev/snd or /dev/pcmC0D0p node.

so I change the file rcS add some sentence:
rm -rf /dev/snd
rm -rf /dev/snd/pcmC0D0p
mkdir /dev/snd
mknod /dev/snd/pcmC0D0p c 116 16
however there is also no directory /dev/snd or node pcmC0D0p
what is wrong?
thank you MT
Best regards

snd-netx-vs1003-objs := netx-vs1003.o

in /sound/arm/Kconfig
menu "ALSA ARM devices"
depends on SND!=n && ARM
config SND_NETX_VS1003

tristate "netx500 vs1003 driver"

select SND_PCM

help

Say Y here if you have a board based on NETX Series

and want to use VS1003 audio chip.

So maybe I need to write a udev rule