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[uart] Support 16550 UARTs accessed via either MMIO or port I/O

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Use the combined accessors ioread8() and iowrite8() to read and write
16550 UART registers, to allow the decision between using MMIO and
port I/O to be made at runtime.

Minimise the increase in code size for x86 by ignoring the register
shift, since this is essentially used only for non-x86 SoCs.

Signed-off-by: Michael Brown <mcb30@ipxe.org>
This commit is contained in:
Michael Brown
2025-11-04 16:43:44 +00:00
parent f7de1b53dc
commit a786c8d231
2 changed files with 4 additions and 4 deletions
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4
src/arch/x86/include/bits/ns16550.h
View File

@@ -23,7 +23,7 @@ static inline __attribute__ (( always_inline )) void
ns16550_write ( struct ns16550_uart *ns16550, unsigned int address,
uint8_t data ) {
outb ( data, ( ns16550->base + address ) );
iowrite8 ( data, ( ns16550->base + address ) );
}
/**
@@ -36,7 +36,7 @@ ns16550_write ( struct ns16550_uart *ns16550, unsigned int address,
static inline __attribute__ (( always_inline )) uint8_t
ns16550_read ( struct ns16550_uart *ns16550, unsigned int address ) {
return inb ( ns16550->base + address );
return ioread8 ( ns16550->base + address );
}
/* Fixed ISA serial port base addresses */

4
src/include/bits/ns16550.h
View File

@@ -23,7 +23,7 @@ static inline __attribute__ (( always_inline )) void
ns16550_write ( struct ns16550_uart *ns16550, unsigned int address,
uint8_t data ) {
writeb ( data, ( ns16550->base + ( address << ns16550->shift ) ) );
iowrite8 ( data, ( ns16550->base + ( address << ns16550->shift ) ) );
}
/**
@@ -36,7 +36,7 @@ ns16550_write ( struct ns16550_uart *ns16550, unsigned int address,
static inline __attribute__ (( always_inline )) uint8_t
ns16550_read ( struct ns16550_uart *ns16550, unsigned int address ) {
return readb ( ns16550->base + ( address << ns16550->shift ) );
return ioread8 ( ns16550->base + ( address << ns16550->shift ) );
}
#endif /* _BITS_NS16550_H */