[PATCH] Allow ns16550.c to get base baud from rs_table instead of BAUD_BASE

[Grant Likely <glikely@gmail.com>]

Modifies serial_init to get base baud rate from the rs_table entry instead
of BAUD_BASE.  Will default back to BAUD_BASE if base_baud is not set.

This patch eliminates duplication between the SERIAL_PORT_DFNS macro and
BAUD_BASE.  Without the patch, if a port set the baud rate in
SERIAL_PORT_DFNS, but did not update BASE_BAUD, the BASE_BAUD value
would still be used.

Rather; serial_init() should look first in SERIAL_PORT_DFNS and use
BASE_BAUD as a backup.

Signed-off-by: Grant Likely <grant.likely@gdcanada.com>
---

 arch/ppc/boot/common/ns16550.c |   11 +++++++++--
 1 files changed, 9 insertions(+), 2 deletions(-)

8ef971164affa27492e0f4abe73baf9b438575db
diff --git a/arch/ppc/boot/common/ns16550.c b/arch/ppc/boot/common/ns16550.c
--- a/arch/ppc/boot/common/ns16550.c
+++ b/arch/ppc/boot/common/ns16550.c
@@ -25,6 +25,7 @@ unsigned long serial_init(int chan, void
 {
 |------unsigned long com_port;
 |------unsigned char lcr, dlm;
+|------unsigned long baud_base;

 |------/* We need to find out which type io we're expecting.  If it's
 |------ * 'SERIAL_IO_PORT', we get an offset from the isa_io_base.
@@ -43,6 +44,12 @@ unsigned long serial_init(int chan, void

 |------/* How far apart the registers are. */
 |------shift = rs_table[chan].iomem_reg_shift;
+|------baud_base = rs_table[chan].baud_base;
+#if defined(BASE_BAUD)
+|------if (!baud_base)
+|------|-------baud_base = BASE_BAUD;
+#endif
+
 |------
 |------/* save the LCR */
 |------lcr = inb(com_port + (UART_LCR << shift));
@@ -62,9 +69,9 @@ unsigned long serial_init(int chan, void
 |------else {
 |------|-------/* Input clock. */
 |------|-------outb(com_port + (UART_DLL << shift),
-|------|-------     (BASE_BAUD / SERIAL_BAUD) & 0xFF);
+|------|-------     (baud_base / SERIAL_BAUD) & 0xFF);
 |------|-------outb(com_port + (UART_DLM << shift),
-|------|-------     (BASE_BAUD / SERIAL_BAUD) >> 8);
+|------|-------     (baud_base / SERIAL_BAUD) >> 8);
 |------|-------/* 8 data, 1 stop, no parity */
 |------|-------outb(com_port + (UART_LCR << shift), 0x03);
 |------|-------/* RTS/DTR */