SMC as UART problem on mpc8xx

SMC as UART problem on mpc8xx

[a b]

Hi,
I have mpc8xx where I would like the following configuration:
 - SCC1 as system console (works fine) 
 - SMC1-2 as UART (doesn\'t work)

I use linux 2.6.16.20 with backward patch from linux-2.6.19.2 for SMCs. My only problem is 
that even I can see cpm_uart registered for IRQ 20 (for SMC1) I never get interrupt even
I do e.g. \"echo 123 > /dev/ttyCPM\". 

here is a short extract from /proc/interrupts:
 20:          0   CPM       Edge      cpm_uart  <--SMC1
 21:       7546   CPM       Edge      SPI
 46:         20   CPM       Edge      cpm_uart  <-- SCC1 (console)

here is a short extract from /proc/tty/driver/ttyCPM:
serinfo:1.0 driver revision:
0: uart:CPM UART mmio:0xFFF00A80 irq:20 tx:14 rx:0 RTS|CTS|DTR|DSR|CD
1: uart:CPM UART mmio:0xFFF00A90 irq:19 tx:0 rx:0 CTS|DSR|CD
2: uart:CPM UART mmio:0xFFF00A00 irq:46 tx:3038 rx:46 RTS|CTS|DTR|DSR|CD

Can anybody help me to get SMCs working?

thnx,
Ladislav.



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Re: SMC as UART problem on mpc8xx

[Vitaly Bordug]

On 01 Feb 2007 17:10:31 +0100 (CET)
a b <poseidon21@post.sk> wrote:

> Hi,
> I have mpc8xx where I would like the following configuration:
>  - SCC1 as system console (works fine) 
>  - SMC1-2 as UART (doesn\'t work)
> 
> I use linux 2.6.16.20 with backward patch from linux-2.6.19.2 for SMCs. My only problem is 
> that even I can see cpm_uart registered for IRQ 20 (for SMC1) I never get interrupt even
> I do e.g. \"echo 123 > /dev/ttyCPM\". 
> 
> here is a short extract from /proc/interrupts:
>  20:          0   CPM       Edge      cpm_uart  <--SMC1
>  21:       7546   CPM       Edge      SPI
>  46:         20   CPM       Edge      cpm_uart  <-- SCC1 (console)
> 
> here is a short extract from /proc/tty/driver/ttyCPM:
> serinfo:1.0 driver revision:
> 0: uart:CPM UART mmio:0xFFF00A80 irq:20 tx:14 rx:0 RTS|CTS|DTR|DSR|CD
> 1: uart:CPM UART mmio:0xFFF00A90 irq:19 tx:0 rx:0 CTS|DSR|CD
> 2: uart:CPM UART mmio:0xFFF00A00 irq:46 tx:3038 rx:46 RTS|CTS|DTR|DSR|CD
> 
> Can anybody help me to get SMCs working?
> 
> 
Check IO ports? IIRC, in 8xx some SoC devices could not work simultaneously because they 
share some GPIO pins. In any case, if something does not function with CPM UART, IOports stuff is the first thing to check.

-- 
Sincerely, 
Vitaly

Re: SMC as UART problem on mpc8xx

[Vitaly Bordug]

On 02 Feb 2007 11:51:01 +0100 (CET)
Ladislav Klenovic <poseidon21@post.sk> wrote:

> > On 01 Feb 2007 17:10:31 +0100 (CET)
> > a b  wrote:
> > 
> > > Hi,
> > > I have mpc8xx where I would like the following configuration:
> > >  - SCC1 as system console (works fine) 
> > >  - SMC1-2 as UART (doesn\\\'t work)
> > > 
> > > I use linux 2.6.16.20 with backward patch from linux-2.6.19.2 for SMCs. My only problem is 
> > > that even I can see cpm_uart registered for IRQ 20 (for SMC1) I never get interrupt even
> > > I do e.g. \\\"echo 123 > /dev/ttyCPM\\\". 
> > > 
> > > here is a short extract from /proc/interrupts:
> > >  20:          0   CPM       Edge      cpm_uart  <--SMC1
> > >  21:       7546   CPM       Edge      SPI
> > >  46:         20   CPM       Edge      cpm_uart  <-- SCC1 (console)
> > > 
> > > here is a short extract from /proc/tty/driver/ttyCPM:
> > > serinfo:1.0 driver revision:
> > > 0: uart:CPM UART mmio:0xFFF00A80 irq:20 tx:14 rx:0 RTS|CTS|DTR|DSR|CD
> > > 1: uart:CPM UART mmio:0xFFF00A90 irq:19 tx:0 rx:0 CTS|DSR|CD
> > > 2: uart:CPM UART mmio:0xFFF00A00 irq:46 tx:3038 rx:46 RTS|CTS|DTR|DSR|CD
> > > 
> > > Can anybody help me to get SMCs working?
> > > 
> > > 
> > Check IO ports? IIRC, in 8xx some SoC devices could not work simultaneously because they 
> > share some GPIO pins. In any case, if something does not function with CPM UART, IOports stuff is the first thing to check.
> > 
> > -- 
> > Sincerely, 
> > Vitaly
> > 
> 
> Hi,
> thnx for hint, you were right, problem was in I/O port configuration. 
> I am a bit wondered why is B port for mpc8xx not configured in 2.16.19.2. Or is it  
> configured somewhere else? I especially miss this part of code in cpm_uart_cpm1.c:
> 
> void smc1_lineif(struct uart_cpm_port *pinfo){
> ...
> #elif defined (CONFIG_MPC86XADS)
>        if (!pinfo->is_portb) {
>                 cp->cp_pbpar |= iobits;
>                 cp->cp_pbdir &= ~iobits;
>                 cp->cp_pbodr &= ~iobits;
>         } else {
>                 ((immap_t *)IMAP_ADDR)->im_ioport.iop_papar |= iobits;
>                 ((immap_t *)IMAP_ADDR)->im_ioport.iop_padir &= ~iobits;
>                 ((immap_t *)IMAP_ADDR)->im_ioport.iop_paodr &= ~iobits;
>         }
> #endif
> ...
> }
> 
Oh well, the preferred way is not to bloat drivers/ space with code snippets that are clearly 
board specific. There are hooks to set up IO space in BSP code already, it just has to have proper pinfo 
set up - mpc86xads and mpc885ads work that way. Yet I haven't checked ppc/ stuff for a while, being concentrated on arch/powerpc...


-- 
Sincerely, 
Vitaly