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Re: [PATCH 3/5] tty/8250_dw: Add support for OCTEON UARTS.

To: Heikki Krogerus <>
Subject: Re: [PATCH 3/5] tty/8250_dw: Add support for OCTEON UARTS.
From: David Daney <>
Date: Wed, 19 Jun 2013 09:47:08 -0700
Cc:,, Jamie Iles <>, Greg Kroah-Hartman <>, Jiri Slaby <>,,, David Daney <>
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On 06/19/2013 07:10 AM, Heikki Krogerus wrote:
On Tue, Jun 18, 2013 at 12:12:53PM -0700, David Daney wrote:
A few differences needed by OCTEON:

o These are DWC UARTS, but have USR at a different offset.

o OCTEON must have 64-bit wide register accesses, so we have OCTEON
   specific register accessors.

o No UCV register, so we hard code some properties.

Signed-off-by: David Daney <>


@@ -270,10 +301,8 @@ static int dw8250_probe(struct platform_device *pdev)
        uart.port.serial_out = dw8250_serial_out;
        uart.port.private_data = data;

-       dw8250_setup_port(&uart);
        if (pdev->dev.of_node) {
-               err = dw8250_probe_of(&uart.port);
+               err = dw8250_probe_of(&uart.port, data);
                if (err)
                        return err;
        } else if (ACPI_HANDLE(&pdev->dev)) {
@@ -284,6 +313,9 @@ static int dw8250_probe(struct platform_device *pdev)
                return -ENODEV;

+       if (!data->no_ucv)
+               dw8250_setup_port(&uart);

Moving the dw8250_setup_port() call here breaks dw8250_probe_acpi(). It
expects values from the CPR register for the DMA burst size calculation.

The DMA support can be moved to a separate function. This way it can
be called after this point, and it will then be available for both DT
and ACPI. I can make a patch tomorrow. That should solve this issue.

I am reworking the patch because other problems were found. I will try to get this part right in the next version.

David Daney

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