diff options
| author | Peter Hurley <peter@hurleysoftware.com> | 2015-03-01 11:05:46 -0500 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2015-03-07 03:55:07 +0100 |
| commit | 73abaf87f01be6fa6da3c0aa9c138a1b6b281068 (patch) | |
| tree | 165c9ca2fb5d8b583cbf5d83aaa26c486a6f4f83 /drivers/tty/serial/serial_core.c | |
| parent | 1e1257860fd10487795b782f1dbb5b5f2c203474 (diff) | |
serial: earlycon: Refactor parse_options into serial core
Prepare to support console-defined matching; refactor the command
line parameter string processing from parse_options() into a
new core function, uart_parse_earlycon(), which decodes command line
parameters of the form:
earlycon=<name>,io|mmio|mmio32,<addr>,<options>
console=<name>,io|mmio|mmio32,<addr>,<options>
earlycon=<name>,0x<addr>,<options>
console=<name>,0x<addr>,<options>
Signed-off-by: Peter Hurley <peter@hurleysoftware.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'drivers/tty/serial/serial_core.c')
| -rw-r--r-- | drivers/tty/serial/serial_core.c | 46 |
1 files changed, 46 insertions, 0 deletions
diff --git a/drivers/tty/serial/serial_core.c b/drivers/tty/serial/serial_core.c index 63d29473c703..8379e3fa0162 100644 --- a/drivers/tty/serial/serial_core.c +++ b/drivers/tty/serial/serial_core.c @@ -1809,6 +1809,52 @@ uart_get_console(struct uart_port *ports, int nr, struct console *co) } /** + * uart_parse_earlycon - Parse earlycon options + * @p: ptr to 2nd field (ie., just beyond '<name>,') + * @iotype: ptr for decoded iotype (out) + * @addr: ptr for decoded mapbase/iobase (out) + * @options: ptr for <options> field; NULL if not present (out) + * + * Decodes earlycon kernel command line parameters of the form + * earlycon=<name>,io|mmio|mmio32,<addr>,<options> + * console=<name>,io|mmio|mmio32,<addr>,<options> + * + * The optional form + * earlycon=<name>,0x<addr>,<options> + * console=<name>,0x<addr>,<options> + * is also accepted; the returned @iotype will be UPIO_MEM. + * + * Returns 0 on success or -EINVAL on failure + */ +int uart_parse_earlycon(char *p, unsigned char *iotype, unsigned long *addr, + char **options) +{ + if (strncmp(p, "mmio,", 5) == 0) { + *iotype = UPIO_MEM; + p += 5; + } else if (strncmp(p, "mmio32,", 7) == 0) { + *iotype = UPIO_MEM32; + p += 7; + } else if (strncmp(p, "io,", 3) == 0) { + *iotype = UPIO_PORT; + p += 3; + } else if (strncmp(p, "0x", 2) == 0) { + *iotype = UPIO_MEM; + } else { + return -EINVAL; + } + + *addr = simple_strtoul(p, NULL, 0); + p = strchr(p, ','); + if (p) + p++; + + *options = p; + return 0; +} +EXPORT_SYMBOL_GPL(uart_parse_earlycon); + +/** * uart_parse_options - Parse serial port baud/parity/bits/flow control. * @options: pointer to option string * @baud: pointer to an 'int' variable for the baud rate. |