diff options
Diffstat (limited to 'drivers/tty/serial/amba-pl011.c')
| -rw-r--r-- | drivers/tty/serial/amba-pl011.c | 32 |
1 files changed, 32 insertions, 0 deletions
diff --git a/drivers/tty/serial/amba-pl011.c b/drivers/tty/serial/amba-pl011.c index 2296bb0f9578..c010f639298d 100644 --- a/drivers/tty/serial/amba-pl011.c +++ b/drivers/tty/serial/amba-pl011.c @@ -2435,6 +2435,37 @@ static void pl011_early_write(struct console *con, const char *s, unsigned n) uart_console_write(&dev->port, s, n, pl011_putc); } +#ifdef CONFIG_CONSOLE_POLL +static int pl011_getc(struct uart_port *port) +{ + if (readl(port->membase + UART01x_FR) & UART01x_FR_RXFE) + return NO_POLL_CHAR; + + if (port->iotype == UPIO_MEM32) + return readl(port->membase + UART01x_DR); + else + return readb(port->membase + UART01x_DR); +} + +static int pl011_early_read(struct console *con, char *s, unsigned int n) +{ + struct earlycon_device *dev = con->data; + int ch, num_read = 0; + + while (num_read < n) { + ch = pl011_getc(&dev->port); + if (ch == NO_POLL_CHAR) + break; + + s[num_read++] = ch; + } + + return num_read; +} +#else +#define pl011_early_read NULL +#endif + /* * On non-ACPI systems, earlycon is enabled by specifying * "earlycon=pl011,<address>" on the kernel command line. @@ -2454,6 +2485,7 @@ static int __init pl011_early_console_setup(struct earlycon_device *device, return -ENODEV; device->con->write = pl011_early_write; + device->con->read = pl011_early_read; return 0; } |