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Author	SHA1	Message	Date
Benjamin Herrenschmidt	f5e1d23a18	term/ns8250: Support more MMIO access sizes ... It is common for PCI based UARTs to use larger than one byte access sizes. This adds support for this and uses the information present in SPCR accordingly. Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org> Reviewed-by: Daniel Kiper <daniel.kiper@oracle.com>	2023-01-19 17:39:04 +01:00
Benjamin Herrenschmidt	7b192ec4cd	term/ns8250: Use ACPI SPCR table when available to configure serial ... "serial auto" is now equivalent to just "serial" and will use the SPCR to discover the port if present, otherwise defaults to "com0" as before. This allows to support MMIO ports specified by ACPI which is needed on AWS EC2 "metal" instances, and will enable GRUB to pickup the port configuration specified by ACPI in other cases. Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org> Reviewed-by: Daniel Kiper <daniel.kiper@oracle.com>	2023-01-19 17:39:03 +01:00
Benjamin Herrenschmidt	c2ef140a68	term/ns8250: Add configuration parameter when adding ports ... This will allow ports to be added with a pre-set configuration. Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org> Reviewed-by: Daniel Kiper <daniel.kiper@oracle.com>	2023-01-19 17:39:03 +01:00
Benjamin Herrenschmidt	9fb22d0478	term/ns8250: Add base support for MMIO UARTs ... This adds the ability for the driver to access UARTs via MMIO instead of PIO selectively at runtime, and exposes a new function to add an MMIO port. In an ideal world, MMIO accessors would be generic and have architecture specific memory barriers. However, existing drivers don't have them and most of those "bare metal" drivers tend to be for x86 which doesn't need them. If necessary, those can be added later. Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org> Reviewed-by: Daniel Kiper <daniel.kiper@oracle.com>	2023-01-19 17:36:25 +01:00