linux-kernel - Re: [PATCH 8/8] 8250: add Texas Instruments AR7 internal UART

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Date:	Thu, 11 Jun 2009 11:30:22 +0200
From:	Thomas Bogendoerfer <tsbogend@...ha.franken.de>
To:	Florian Fainelli <florian@...nwrt.org>
Cc:	Linux-MIPS <linux-mips@...ux-mips.org>,
	Ralf Baechle <ralf@...ux-mips.org>,
	linux-kernel@...r.kernel.org, Alan Cox <alan@...rguk.ukuu.org.uk>,
	linux-serial@...r.kernel.org
Subject: Re: [PATCH 8/8] 8250: add Texas Instruments AR7 internal UART

On Thu, Jun 11, 2009 at 10:28:39AM +0200, Florian Fainelli wrote:
> Le Friday 05 June 2009 00:20:20 Thomas Bogendoerfer, vous avez écrit :
> > On Thu, Jun 04, 2009 at 04:22:46PM +0200, Florian Fainelli wrote:
> > > We discussed that in private, there are a couple of things
> > > to fix in order to get 8250 working properly with TI AR7 HW.
> > > If you can still merge that bit, this would ease future work, thanks !
> >
> > I still have a tree here, which works without any changes to the 8250
> > serial driver on a TNETD7300 device.
> 
> Could you show me how you register the 8250 driver ? Without the 8250-specific 

static struct plat_serial8250_port uart0_data = {
        .mapbase = AR7_REGS_UART0,
        .irq = AR7_IRQ_UART0,
        .regshift = 2,
        .iotype = UPIO_MEM,
        .flags = UPF_BOOT_AUTOCONF | UPF_IOREMAP,
};

        uart_port[0].type = PORT_16550A;
        uart_port[0].line = 0;
        uart_port[0].irq = AR7_IRQ_UART0;
        uart_port[0].uartclk = ar7_bus_freq() / 2;
        uart_port[0].iotype = UPIO_MEM;
        uart_port[0].mapbase = AR7_REGS_UART0 + 3;
        uart_port[0].membase = ioremap(uart_port[0].mapbase, 256);
        uart_port[0].regshift = 2;
        res = early_serial_setup(&uart_port[0]);
        if (res)
                return res;


the +3 comes from the fact, that this machine is configured to run big
endian.

Here is the boot log:

Serial: 8250/16550 driver $Revision: 1.90 $ 2 ports, IRQ sharing disabled
serial8250: ttyS0 at MMIO 0x8610e03 (irq = 15) is a 16550A
console handover: boot [early0] -> real [ttyS0]
serial8250: ttyS1 at MMIO 0x8610f00 (irq = 19) is a 16550A
loop: module loaded
Fixed MDIO Bus: probed


ttyS1 uses the wrong address, but there is nothing connected to
that port on the box.

Do you see the problem on TNETD7200 devices as well ?

Thomas.

-- 
Crap can work. Given enough thrust pigs will fly, but it's not necessary a
good idea.                                                [ RFC1925, 2.3 ]
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