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serial: pl011: add console matching function 

This patch adds function pl011_console_match() that implements
method match of struct console.  It allows to match consoles against
data specified in a string, for example taken from command line or
compiled by ACPI SPCR table handler.

Signed-off-by: Aleksey Makarov <aleksey.makarov@linaro.org>
Reviewed-by: Peter Hurley <peter@hurleysoftware.com>
Acked-by: Russell King <rmk+kernel@armlinux.org.uk>
Tested-by: Christopher Covington <cov@codeaurora.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Aleksey Makarov 2016-09-27 23:54:15 +03:00 committed by Greg Kroah-Hartman
parent 888125a712
commit 8b8f347d3a
1 changed files with 55 additions and 0 deletions
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55
drivers/tty/serial/amba-pl011.c
View File

@ -2315,12 +2315,67 @@ static int __init pl011_console_setup(struct console *co, char *options)
return uart_set_options(&uap->port, co, baud, parity, bits, flow);
}
/**
* pl011_console_match - non-standard console matching
* @co: registering console
* @name: name from console command line
* @idx: index from console command line
* @options: ptr to option string from console command line
*
* Only attempts to match console command lines of the form:
* console=pl011,mmio|mmio32,<addr>[,<options>]
* console=pl011,0x<addr>[,<options>]
* This form is used to register an initial earlycon boot console and
* replace it with the amba_console at pl011 driver init.
*
* Performs console setup for a match (as required by interface)
* If no <options> are specified, then assume the h/w is already setup.
*
* Returns 0 if console matches; otherwise non-zero to use default matching
*/
static int __init pl011_console_match(struct console *co, char *name, int idx,
char *options)
{
unsigned char iotype;
unsigned long addr;
int i;
if (strcmp(name, "pl011") != 0)
return -ENODEV;
if (uart_parse_earlycon(options, &iotype, &addr, &options))
return -ENODEV;
if (iotype != UPIO_MEM && iotype != UPIO_MEM32)
return -ENODEV;
/* try to match the port specified on the command line */
for (i = 0; i < ARRAY_SIZE(amba_ports); i++) {
struct uart_port *port;
if (!amba_ports[i])
continue;
port = &amba_ports[i]->port;
if (port->mapbase != addr)
continue;
co->index = i;
port->cons = co;
return pl011_console_setup(co, options);
}
return -ENODEV;
}
static struct uart_driver amba_reg;
static struct console amba_console = {
.name = "ttyAMA",
.write = pl011_console_write,
.device = uart_console_device,
.setup = pl011_console_setup,
.match = pl011_console_match,
.flags = CON_PRINTBUFFER,
.index = -1,
.data = &amba_reg,