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Re: weird HAL2

To: Ulf Carlsson <ulfc@bun.falkenberg.se>
Subject: Re: weird HAL2
From: Alistair Lambie <alambie@rock.csd.sgi.com>
Date: Wed, 03 Feb 1999 09:25:04 +1300
Cc: Alistair Lambie <alambie@rock.csd.sgi.com>, Linux SGI <linux@cthulhu.engr.sgi.com>
References: <19990202171745.A1051@bun.falkenberg.se> <36B753D6.641616A4@csd.sgi.com> <19990202205328.A1996@bun.falkenberg.se>
Sender: owner-linux@cthulhu.engr.sgi.com
Ulf Carlsson wrote:
> 
> > I don't know anything about the HAL2, but looking in hal2.h it says
> > 0=reset, so from what I can see you write 0x0018 to it and then it
> > should read 0x0000 when it is reset.
> 

write 0x0
wait 50us
write 0x18

write to indirect data reg
write to indirect addr reg

spin until idirect status reg transaction status reg clears

.....


> The spec says:
> 
> Bit 3, Global reset R/W:
> Assertion of hardware reset i.e. RESET_N, set this to zero. Software brings 
> the
> HAL2 out of reset by setting this bit and may reset the HAL2 by clearing it.
> Please note: this bit must be set before any other internal register access
> occurs.
> RESET = 0;
> ACTIVE = 1;
> 
> Bit 4, Codec reset R/W:
> Value reflected to CODEC_RESET_N pin. To reset external codecs and other
> external devices.
> RESET = 0; ACTIVE = 1;
> 
> This is exactly what I'm trying to do by first writing 0x0000 to isr, waiting
> some us, and then writing 0x0018. Then the card should be active and isr 
> should
> IMHO contain 0x0018.
> 
> > Maybe this part is working ok for you and the problem is further along?
> 
> Nope.
> 
> - Ulf

-- 
Alistair Lambie                                alambie@csd.sgi.com
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