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authorStefan Weil <weil@mail.berlios.de>2009-10-31 11:28:11 +0100
committerAnthony Liguori <aliguori@us.ibm.com>2009-11-12 11:23:53 -0600
commit038eaf82c853f3bf8d4c106c0677bbf4adada7de (patch)
treeb7f750e6f884315960d195295d03e95c99bab09f /hw/serial.c
parentba6d048aadb3a7fb87781a76dc89bb09edac1fcf (diff)
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>
Diffstat (limited to 'hw/serial.c')
-rw-r--r--hw/serial.c7
1 files changed, 7 insertions, 0 deletions
diff --git a/hw/serial.c b/hw/serial.c
index fa12dcc075..0063260569 100644
--- a/hw/serial.c
+++ b/hw/serial.c
@@ -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 };