Patch for supporting CPR register in 16C950 UART

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Hello.

Here is a patch (tested on kernels 2.4.3 and 2.4.4) that adds 2 ioctl's=
 in serial.c. One, TCSSERCPR, sets the CPR register in 16C950 UARTs. Th=
is register is a pre-scaler (that is, a divisor) for the clock. If the =
value is N, the clock is divided by N/8.=20
If N<8, pre-scaling is disabled by setting bit 7 of MCR to 0. The other=
 one, TCGSERCPR,, reads the value of CPR. If pre-scaling is disabled, i=
t returns 8 (i.e., the clock frequency is left intact).

The patch also disables resetting the UART via the CSR register every t=
ime the serial device is opened (in the startup() function). This would=
 reset the content of CPR.
---------------------------------------------------------
Fabrizio Gennari          tel. [phone]
Philips Research Monza    fax. [phone]
via G. Casati 23          [e-mail]
20052 Monza (MI) Italy    http://www.research.philips.com
=

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