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dev/uart: Support setting the register io width

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Some uarts require a specific register width. Support setting this in
the kernel environment.

Reviewed by:	imp (earlier version)
Sponsored by:	Arm Ltd
Differential Revision:	https://reviews.freebsd.org/D43362
This commit is contained in:
Andrew Turner 2024-01-08 15:22:58 +00:00
parent 949670f8f4
commit eae36de826
1 changed files with 9 additions and 0 deletions
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9
sys/dev/uart/uart_subr.c
View file

@ -47,6 +47,7 @@
#define UART_TAG_SB 8
#define UART_TAG_XO 9
#define UART_TAG_BD 10
#define UART_TAG_RW 11
static bus_addr_t
uart_parse_addr(const char **p)
@ -148,6 +149,10 @@ uart_parse_tag(const char **p)
tag = UART_TAG_RS;
goto out;
}
if ((*p)[0] == 'r' && (*p)[1] == 'w') {
tag = UART_TAG_RW;
goto out;
}
if ((*p)[0] == 's' && (*p)[1] == 'b') {
tag = UART_TAG_SB;
goto out;
@ -225,6 +230,7 @@ uart_getenv(int devtype, struct uart_devinfo *di, struct uart_class *class)
/* Set defaults. */
di->bas.chan = 0;
di->bas.regshft = 0;
di->bas.regiowidth = 1;
di->bas.rclk = 0;
di->baudrate = 0;
di->databits = 8;
@ -264,6 +270,9 @@ uart_getenv(int devtype, struct uart_devinfo *di, struct uart_class *class)
case UART_TAG_RS:
di->bas.regshft = uart_parse_long(&spec);
break;
case UART_TAG_RW:
di->bas.regiowidth = uart_parse_long(&spec);
break;
case UART_TAG_SB:
di->stopbits = uart_parse_long(&spec);
break;