diff options
| -rw-r--r-- | drivers/tty/serial/earlycon.c | 39 | ||||
| -rw-r--r-- | drivers/tty/serial/serial_core.c | 46 | ||||
| -rw-r--r-- | include/linux/serial_core.h | 2 |
3 files changed, 61 insertions, 26 deletions
diff --git a/drivers/tty/serial/earlycon.c b/drivers/tty/serial/earlycon.c index 64fe25a4285c..58d6bcdaf31c 100644 --- a/drivers/tty/serial/earlycon.c +++ b/drivers/tty/serial/earlycon.c @@ -54,44 +54,31 @@ static void __iomem * __init earlycon_map(unsigned long paddr, size_t size) return base; } -static int __init parse_options(struct earlycon_device *device, - char *options) +static int __init parse_options(struct earlycon_device *device, char *options) { struct uart_port *port = &device->port; - int mmio, mmio32, length; + int length; unsigned long addr; - if (!options) - return -ENODEV; + if (uart_parse_earlycon(options, &port->iotype, &addr, &options)) + return -EINVAL; - mmio = !strncmp(options, "mmio,", 5); - mmio32 = !strncmp(options, "mmio32,", 7); - if (mmio || mmio32) { - port->iotype = (mmio ? UPIO_MEM : UPIO_MEM32); - options += mmio ? 5 : 7; - addr = simple_strtoul(options, NULL, 0); + switch (port->iotype) { + case UPIO_MEM32: + port->regshift = 2; /* fall-through */ + case UPIO_MEM: port->mapbase = addr; - if (mmio32) - port->regshift = 2; - } else if (!strncmp(options, "io,", 3)) { - port->iotype = UPIO_PORT; - options += 3; - addr = simple_strtoul(options, NULL, 0); + break; + case UPIO_PORT: port->iobase = addr; - mmio = 0; - } else if (!strncmp(options, "0x", 2)) { - port->iotype = UPIO_MEM; - addr = simple_strtoul(options, NULL, 0); - port->mapbase = addr; - } else { + break; + default: return -EINVAL; } port->uartclk = BASE_BAUD * 16; - options = strchr(options, ','); if (options) { - options++; device->baud = simple_strtoul(options, NULL, 0); length = min(strcspn(options, " ") + 1, (size_t)(sizeof(device->options))); @@ -100,7 +87,7 @@ static int __init parse_options(struct earlycon_device *device, if (port->iotype == UPIO_MEM || port->iotype == UPIO_MEM32) pr_info("Early serial console at MMIO%s 0x%llx (options '%s')\n", - mmio32 ? "32" : "", + (port->iotype == UPIO_MEM32) ? "32" : "", (unsigned long long)port->mapbase, device->options); else 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. diff --git a/include/linux/serial_core.h b/include/linux/serial_core.h index baf3e1d08416..cc5c506f07dd 100644 --- a/include/linux/serial_core.h +++ b/include/linux/serial_core.h @@ -354,6 +354,8 @@ early_param("earlycon", name ## _setup_earlycon); struct uart_port *uart_get_console(struct uart_port *ports, int nr, struct console *c); +int uart_parse_earlycon(char *p, unsigned char *iotype, unsigned long *addr, + char **options); void uart_parse_options(char *options, int *baud, int *parity, int *bits, int *flow); int uart_set_options(struct uart_port *port, struct console *co, int baud, |