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tty: of_serial: support for 32 bit accesses

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Some platforms e.g. TI Davinci require 32-bit accesses to the UARTs.
The of_serial driver currently registers all UARTs as UPIO_MEM.  Add a
new attribute "reg-io-width" to allow the port to be registered with
different IO width requirements.

Acked-by: Alan Cox <alan@linux.intel.com>
Signed-off-by: Jamie Iles <jamie@jamieiles.com>
Signed-off-by: Grant Likely <grant.likely@secretlab.ca>
This commit is contained in:
Jamie Iles 2011-06-27 13:32:34 +01:00 committed by Grant Likely
parent 61ab1a90d8
commit 7423734e19
2 changed files with 20 additions and 0 deletions
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3
Documentation/devicetree/bindings/tty/serial/of-serial.txt
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@ -19,6 +19,9 @@ Optional properties:
- current-speed : the current active speed of the UART.
- reg-offset : offset to apply to the mapbase from the start of the registers.
- reg-shift : quantity to shift the register offsets by.
- reg-io-width : the size (in bytes) of the IO accesses that should be
performed on the device. There are some systems that require 32-bit
accesses to the UART (e.g. TI davinci).
- used-by-rtas : set to indicate that the port is in use by the OpenFirmware
RTAS and should not be registered.

17
drivers/tty/serial/of_serial.c
View File

@ -65,6 +65,23 @@ static int __devinit of_platform_serial_setup(struct platform_device *ofdev,
port->irq = irq_of_parse_and_map(np, 0);
port->iotype = UPIO_MEM;
prop = of_get_property(np, "reg-io-width", &prop_size);
if (prop && (prop_size == sizeof(u32))) {
switch (be32_to_cpup(prop)) {
case 1:
port->iotype = UPIO_MEM;
break;
case 4:
port->iotype = UPIO_MEM32;
break;
default:
dev_warn(&ofdev->dev,
"unsupported io width (%d bytes)\n",
be32_to_cpup(prop));
return -EINVAL;
}
}
port->type = type;
port->uartclk = be32_to_cpup(clk);
port->flags = UPF_SHARE_IRQ | UPF_BOOT_AUTOCONF | UPF_IOREMAP