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dev/uart: Support 8-byte register access
While we only support 4-byte registers in the uart code the physical access may be to an 8-byte register. Support this as an option on non-i386. On i386 we lack the needed 8-byte bus_space functions. ACPI has an option for 8-byte register io width, and FDT can be given any size. Support these sizes, even if we don't expect to see hardware with an 8-byte io width. Reviewed by: imp Sponsored by: Arm Ltd Differential Revision: https://reviews.freebsd.org/D43374
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@ -56,6 +56,11 @@ uart_getreg(struct uart_bas *bas, int reg)
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uint32_t ret;
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switch (uart_regiowidth(bas)) {
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#if !defined(__i386__)
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case 8:
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ret = bus_space_read_8(bas->bst, bas->bsh, uart_regofs(bas, reg));
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break;
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#endif
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case 4:
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ret = bus_space_read_4(bas->bst, bas->bsh, uart_regofs(bas, reg));
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break;
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@ -71,10 +76,15 @@ uart_getreg(struct uart_bas *bas, int reg)
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}
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static inline void
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uart_setreg(struct uart_bas *bas, int reg, int value)
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uart_setreg(struct uart_bas *bas, int reg, uint32_t value)
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{
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switch (uart_regiowidth(bas)) {
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#if !defined(__i386__)
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case 8:
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bus_space_write_8(bas->bst, bas->bsh, uart_regofs(bas, reg), value);
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break;
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#endif
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case 4:
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bus_space_write_4(bas->bst, bas->bsh, uart_regofs(bas, reg), value);
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break;
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