From 8b8f347d3a4859d22567f3b8e5bb4a69b1089739 Mon Sep 17 00:00:00 2001 From: Aleksey Makarov Date: Tue, 27 Sep 2016 23:54:15 +0300 Subject: 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 Reviewed-by: Peter Hurley Acked-by: Russell King Tested-by: Christopher Covington Signed-off-by: Greg Kroah-Hartman --- drivers/tty/serial/amba-pl011.c | 55 +++++++++++++++++++++++++++++++++++++++++ 1 file changed, 55 insertions(+) (limited to 'drivers/tty') diff --git a/drivers/tty/serial/amba-pl011.c b/drivers/tty/serial/amba-pl011.c index e2c33b9528d8..cd5d1ee3b8b6 100644 --- a/drivers/tty/serial/amba-pl011.c +++ b/drivers/tty/serial/amba-pl011.c @@ -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,[,] + * console=pl011,0x[,] + * 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 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, -- cgit v1.2.3-59-g8ed1b