Using preallocate pci, isa or nothing?

Using preallocate pci, isa or nothing?

[Mathieu Rondonneau]

Hi,
I'm sorry for the html format, these are some questions according to my
problems.

I'm writing an ALSA driver for a CSB337 board (AT91RM9200). There is no PCI
or ISA on this board. Should I preallocate memory with:
snd_pcm_lib_preallocate_pages_for_all,
snd_pcm_lib_preallocate_isa_pages_for_all() or
snd_pcm_lib_preallocate_pci_pages_for_all()?

There is a specific DMA (PDC) on the AT91RM9200, so i'm trying to use
snd_pcm_lib_preallocate_pages_for_all() but seems complicated to understand
what is needed by the ALSA pcm and what i have to write.
What does the function snd_..._pointer() mean? should i need it if i don't
use ISA or PCI mecanism?
What does the function snd_pcm_period_elapsed() mean? Should i need it if i
don't use ISA or PCI mecanism?

Thanks
any help would be very appreciate.

Mathieu Rondonneau



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Re: Using preallocate pci, isa or nothing?

[Takashi Iwai]

At Sun, 8 Feb 2004 18:29:10 -0600,
Mathieu Rondonneau wrote:
> 
> Hi,
> I'm sorry for the html format, these are some questions according to my
> problems.
> 
> I'm writing an ALSA driver for a CSB337 board (AT91RM9200). There is no PCI
> or ISA on this board. Should I preallocate memory with:
> snd_pcm_lib_preallocate_pages_for_all,
> snd_pcm_lib_preallocate_isa_pages_for_all() or
> snd_pcm_lib_preallocate_pci_pages_for_all()?
> 
> There is a specific DMA (PDC) on the AT91RM9200, so i'm trying to use
> snd_pcm_lib_preallocate_pages_for_all() but seems complicated to understand
> what is needed by the ALSA pcm and what i have to write.
> What does the function snd_..._pointer() mean? should i need it if i don't
> use ISA or PCI mecanism?
> What does the function snd_pcm_period_elapsed() mean? Should i need it if i
> don't use ISA or PCI mecanism?

did you take a look at my document?

	http://www.alsa-project.org/~iwai/writing-an-alsa-driver/


Takashi


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Premiere Conference on Open Tools Development and Integration
See the breadth of Eclipse activity. February 3-5 in Anaheim, CA.
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Re: Using preallocate pci, isa or nothing?

[Mathieu Rondonneau]

> At Sun, 8 Feb 2004 18:29:10 -0600,
> Mathieu Rondonneau wrote:
> >
> > Hi,
> > I'm sorry for the html format, these are some questions according to my
> > problems.
> >
> > I'm writing an ALSA driver for a CSB337 board (AT91RM9200). There is no
PCI
> > or ISA on this board. Should I preallocate memory with:
> > snd_pcm_lib_preallocate_pages_for_all,
> > snd_pcm_lib_preallocate_isa_pages_for_all() or
> > snd_pcm_lib_preallocate_pci_pages_for_all()?
> >
> > There is a specific DMA (PDC) on the AT91RM9200, so i'm trying to use
> > snd_pcm_lib_preallocate_pages_for_all() but seems complicated to
understand
> > what is needed by the ALSA pcm and what i have to write.
> > What does the function snd_..._pointer() mean? should i need it if i
don't
> > use ISA or PCI mecanism?
> > What does the function snd_pcm_period_elapsed() mean? Should i need it
if i
> > don't use ISA or PCI mecanism?
>
> did you take a look at my document?
>
> http://www.alsa-project.org/~iwai/writing-an-alsa-driver/
>
>
> Takashi
>

Yes I did, and i thank you for your work, your document is very helpfull.
But, i'm not familiar with ALSA driver development.
Could I use PCI or ISA mecanism (memory allocation and dma) even if there
are no PCI or ISA bus in my board?
If i don't use it, it's more work to do.
I 'm just wondering if i could use more ALSA function in order to simplify
my development.

I'm sorry for my english (i'm french)
Thank you very much for your help.



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Re: Using preallocate pci, isa or nothing?

[Takashi Iwai]

At Wed, 11 Feb 2004 14:39:47 -0600,
Mathieu Rondonneau wrote:
> 
> 
> 
> > At Sun, 8 Feb 2004 18:29:10 -0600,
> > Mathieu Rondonneau wrote:
> > >
> > > Hi,
> > > I'm sorry for the html format, these are some questions according to my
> > > problems.
> > >
> > > I'm writing an ALSA driver for a CSB337 board (AT91RM9200). There is no
> PCI
> > > or ISA on this board. Should I preallocate memory with:
> > > snd_pcm_lib_preallocate_pages_for_all,
> > > snd_pcm_lib_preallocate_isa_pages_for_all() or
> > > snd_pcm_lib_preallocate_pci_pages_for_all()?
> > >
> > > There is a specific DMA (PDC) on the AT91RM9200, so i'm trying to use
> > > snd_pcm_lib_preallocate_pages_for_all() but seems complicated to
> understand
> > > what is needed by the ALSA pcm and what i have to write.
> > > What does the function snd_..._pointer() mean? should i need it if i
> don't
> > > use ISA or PCI mecanism?
> > > What does the function snd_pcm_period_elapsed() mean? Should i need it
> if i
> > > don't use ISA or PCI mecanism?
> >
> > did you take a look at my document?
> >
> > http://www.alsa-project.org/~iwai/writing-an-alsa-driver/
> >
> >
> > Takashi
> >
> 
> Yes I did, and i thank you for your work, your document is very helpfull.
> But, i'm not familiar with ALSA driver development.
> Could I use PCI or ISA mecanism (memory allocation and dma) even if there
> are no PCI or ISA bus in my board?

then, no.

but note that the functions you asked above have basically nothing to
do with PCI or ISA.  the whole preallocation meachanism is provided
for the abstraction regardless of BUS type.
also, pcm and control callbacks are also irrelevant to BUS type.


Takashi


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using preallocate pci, isa or nothing?

[Mathieu Rondonneau]

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Hi all,

I'm writing an ALSA driver for a CSB337 board (AT91RM9200). There is no PCI or ISA on this board. Should I preallocate memory with: snd_pcm_lib_preallocate_pages_for_all, snd_pcm_lib_preallocate_isa_pages_for_all() or snd_pcm_lib_preallocate_pci_pages_for_all()?

There is a specific DMA (PDC) on the AT91RM9200, so i'm trying to use snd_pcm_lib_preallocate_pages_for_all() but seems complicated to understand what is needed by the ALSA pcm and what i have to write.
What does the function snd_..._pointer() mean? should i need it if i don't use ISA or PCI mecanism?
What does the function snd_pcm_period_elapsed() mean? Should i need it if i don't use ISA or PCI mecanism?

Thanks
any help would be very appreciate.

Mathieu Rondonneau

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