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Make the current baud rate (if specified) a property of the UART, to
allow the default_serial_console() function to specify the default
baud rate as well as the default UART device.
Signed-off-by: Michael Brown <mcb30@ipxe.org>
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The 16550 design includes a programmable 16-bit clock divider for an
arbitrary input clock, requiring knowledge of the input clock
frequency in order to calculate the divider value for a given baud
rate. The 16550 UARTs in an x86 PC will always have a 1.8432 MHz
input clock. Non-x86 systems may have other input clock frequencies.
Define the input clock frequency as a property of a 16550 UART, and
read the value from the device tree "clock-frequency" property.
Signed-off-by: Michael Brown <mcb30@ipxe.org>
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Some implementations of 16550-compatible UARTs (e.g. the DesignWare
UART) are known to ignore writes to the line control register while
the transmitter is active.
Wait for the transmitter to become empty before attempting to write to
the line control register.
Signed-off-by: Michael Brown <mcb30@ipxe.org>
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Signed-off-by: Michael Brown <mcb30@ipxe.org>
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Signed-off-by: Michael Brown <mcb30@ipxe.org>
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Use the generic UART driver-private data pointer, rather than
embedding the generic UART within the 16550 UART structure.
Signed-off-by: Michael Brown <mcb30@ipxe.org>
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Remove the assumption that all platforms use a fixed number of 16550
UARTs identifiable by a simple numeric index. Create an abstraction
allowing for dynamic instantiation and registration of any number of
arbitrary UART models.
The common case of the serial console on x86 uses a single fixed UART
specified at compile time. Avoid unnecessarily dragging in the
dynamic instantiation code in this use case by allowing COMCONSOLE to
refer to a single static UART object representing the relevant port.
When selecting a UART by command-line argument (as used in the
"gdbstub serial <port>" command), allow the UART to be specified as
either a numeric index (to retain backwards compatiblity) or a
case-insensitive port name such as "COM2".
Signed-off-by: Michael Brown <mcb30@ipxe.org>
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