Date: Thu, 26 May 2011 14:12:10 +0100 From: "N.J. Mann" <njm@njm.me.uk> To: John Baldwin <jhb@freebsd.org> Cc: Marcel Moolenaar <marcel@freebsd.org>, freebsd-hardware@freebsd.org Subject: Re: Sunix 4056A PCI 4 port RS-232 card - only 2 ports configured Message-ID: <20110526131210.GA9481@titania.njm.me.uk> In-Reply-To: <201105250946.45653.jhb@freebsd.org> References: <20110522110002.GB91694@titania.njm.me.uk> <201105241610.49930.jhb@freebsd.org> <20110524215232.GB92553@titania.njm.me.uk> <201105250946.45653.jhb@freebsd.org>
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Hi John,
In message <201105250946.45653.jhb@freebsd.org>,
John Baldwin (jhb@freebsd.org) wrote:
> On Tuesday, May 24, 2011 5:52:32 pm N.J. Mann wrote:
> > In message <201105241610.49930.jhb@freebsd.org>,
> > John Baldwin (jhb@freebsd.org) wrote:
> > [snip]
> > >
> > > Ah, uart_puc_probe() always uses the 'uart_ns8250_class' uart driver which
> > > is defined in uart_dev_ns8250.c. ns8250_bus_probe() is what you want to
> > > instrument I think.
> >
> > ns8250_bus_probe() is called twice for each of the working devices as
> > follows:
> >
> > UART2:
> > ------
> > ns8250_bus_probe:: entry
> > ns8250_probe::uart_getreg REG_IIR = 1
> > ns8250_probe::uart_getreg REG_MCR = 0
> > ns8250_bus_probe:: exit
> > ...
> > ns8250_bus_probe:: entry
> > ns8250_probe::uart_getreg REG_IIR = 193
> > ns8250_probe::uart_getreg REG_MCR = 8
> > ns8250_bus_probe:: exit
> >
> > UART3
> > -----
> > ns8250_bus_probe:: entry
> > ns8250_probe::uart_getreg REG_IIR = 1
> > ns8250_probe::uart_getreg REG_MCR = 0
> > ns8250_bus_probe:: exit
> > ...
> > ns8250_bus_probe:: entry
> > ns8250_probe::uart_getreg REG_IIR = 193
> > ns8250_probe::uart_getreg REG_MCR = 8
> > ns8250_bus_probe:: exit
> >
> > For the two devices that fail, ns8250_bus_probe() fails on the first
> > call:
> >
> > UART4
> > -----
> > ns8250_bus_probe:: entry
> > ns8250_probe::uart_getreg REG_IIR = 1
> > ns8250_probe::uart_getreg REG_MCR = 64
> > ns8250_bus_probe::ns8250_probe returned 6
> >
> > UART5
> > -----
> > ns8250_bus_probe:: entry
> > ns8250_probe::uart_getreg REG_IIR = 1
> > ns8250_probe::uart_getreg REG_MCR = 64
> > ns8250_bus_probe::ns8250_probe returned 6
> >
> > The value returned for the read of REG_MCR is 64, or 0x40, which causes
> > the premature exit:
> >
> > static int
> > ns8250_probe(struct uart_bas *bas)
> > {
> > u_char val;
> >
> > /* Check known 0 bits that don't depend on DLAB. */
> > val = uart_getreg(bas, REG_IIR);
> > if (val & 0x30)
> > return (ENXIO);
> > val = uart_getreg(bas, REG_MCR);
> > if (val & 0xe0)
> > return (ENXIO);
> >
> > return (0);
> > }
> >
> > Do you need to know the contents of 'bas'?
>
> This goes beyond my level of knowledge. I've cc'd Marcel (author of uart) who
> can hopefully help with this more.
Thank you for all your help. I now have all four ports working, but a
few things still need sorting out. I'll see if Marcel can help me.
Best wishes.
Cheers,
Nick.
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