diff options
| author | Peter Hurley <peter@hurleysoftware.com> | 2015-02-24 20:25:04 +0100 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2015-03-26 16:14:27 +0100 |
| commit | d81e50f6161ea169a14fbc17a94cd4943f5d8df6 (patch) | |
| tree | c4b29ea21412f0952911b5252560e3f2b304b7b2 /drivers/tty/serial/8250/8250.h | |
| parent | serial: 8250: Simplify capabilities reset at port unregister (diff) | |
| download | linux-d81e50f6161ea169a14fbc17a94cd4943f5d8df6.tar.xz linux-d81e50f6161ea169a14fbc17a94cd4943f5d8df6.zip | |
serial: 8250: Move ns16550a_goto_hispeed() to local header
Prepare for 8250_core.c file split; move shared inline function
to local header file.
Signed-off-by: Peter Hurley <peter@hurleysoftware.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'drivers/tty/serial/8250/8250.h')
| -rw-r--r-- | drivers/tty/serial/8250/8250.h | 18 |
1 files changed, 17 insertions, 1 deletions
diff --git a/drivers/tty/serial/8250/8250.h b/drivers/tty/serial/8250/8250.h index 656ecc60b5b2..23dc9f9b9839 100644 --- a/drivers/tty/serial/8250/8250.h +++ b/drivers/tty/serial/8250/8250.h @@ -21,7 +21,6 @@ struct uart_8250_dma { /* Filter function */ dma_filter_fn fn; - /* Parameter to the filter function */ void *rx_param; void *tx_param; @@ -198,3 +197,20 @@ static inline int serial8250_request_dma(struct uart_8250_port *p) } static inline void serial8250_release_dma(struct uart_8250_port *p) { } #endif + +static inline int ns16550a_goto_highspeed(struct uart_8250_port *up) +{ + unsigned char status; + + status = serial_in(up, 0x04); /* EXCR2 */ +#define PRESL(x) ((x) & 0x30) + if (PRESL(status) == 0x10) { + /* already in high speed mode */ + return 0; + } else { + status &= ~0xB0; /* Disable LOCK, mask out PRESL[01] */ + status |= 0x10; /* 1.625 divisor for baud_base --> 921600 */ + serial_out(up, 0x04, status); + } + return 1; +} |