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serial: Add interface to set reference oscillator frequency 

Many (most?) serial interfaces have a programmable
clock which provides the reference frequency ("baudbase").
So a fixed baudbase which is only set once can be wrong.

omap1.c is an example which could use the new interface
to change baudbase when the programmable clock changes.
ar7 system emulation (still not part of standard QEMU)
is similar to omap and already uses serial_set_frequency.

Signed-off-by: Stefan Weil <weil@mail.berlios.de>
Signed-off-by: Anthony Liguori <aliguori@us.ibm.com>
This commit is contained in:
Stefan Weil 2009-10-31 11:28:11 +01:00 committed by Anthony Liguori
parent ba6d048aad
commit 038eaf82c8
2 changed files with 8 additions and 0 deletions
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1
hw/pc.h
View File

@ -13,6 +13,7 @@ SerialState *serial_mm_init (target_phys_addr_t base, int it_shift,
qemu_irq irq, int baudbase,
CharDriverState *chr, int ioregister);
SerialState *serial_isa_init(int index, CharDriverState *chr);
void serial_set_frequency(SerialState *s, uint32_t frequency);
/* parallel.c */

7
hw/serial.c
View File

@ -730,6 +730,13 @@ static void serial_init_core(SerialState *s)
serial_event, s);
}
/* Change the main reference oscillator frequency. */
void serial_set_frequency(SerialState *s, uint32_t frequency)
{
s->baudbase = frequency;
serial_update_parameters(s);
}
static const int isa_serial_io[MAX_SERIAL_PORTS] = { 0x3f8, 0x2f8, 0x3e8, 0x2e8 };
static const int isa_serial_irq[MAX_SERIAL_PORTS] = { 4, 3, 4, 3 };