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serial: 8250: introduce get_divisor() and set_divisor() hook 

Add these two hooks so that they can be overridden with driver specific
implementations.

Signed-off-by: Jisheng Zhang <Jisheng.Zhang@synaptics.com>
Reviewed-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Jisheng Zhang 2018-07-12 09:57:00 +08:00 committed by Greg Kroah-Hartman
parent 16777ecd1b
commit 0238d2b4a4
3 changed files with 34 additions and 4 deletions
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4
drivers/tty/serial/8250/8250_core.c
View File

@ -1023,6 +1023,10 @@ int serial8250_register_8250_port(struct uart_8250_port *up)
uart->port.get_mctrl = up->port.get_mctrl;
if (up->port.set_mctrl)
uart->port.set_mctrl = up->port.set_mctrl;
if (up->port.get_divisor)
uart->port.get_divisor = up->port.get_divisor;
if (up->port.set_divisor)
uart->port.set_divisor = up->port.set_divisor;
if (up->port.startup)
uart->port.startup = up->port.startup;
if (up->port.shutdown)

27
drivers/tty/serial/8250/8250_port.c
View File

@ -2498,9 +2498,9 @@ static unsigned int npcm_get_divisor(struct uart_8250_port *up,
return DIV_ROUND_CLOSEST(port->uartclk, 16 * baud + 2) - 2;
}
static unsigned int serial8250_get_divisor(struct uart_port *port,
unsigned int baud,
unsigned int *frac)
static unsigned int serial8250_do_get_divisor(struct uart_port *port,
unsigned int baud,
unsigned int *frac)
{
struct uart_8250_port *up = up_to_u8250p(port);
unsigned int quot;
@ -2532,6 +2532,16 @@ static unsigned int serial8250_get_divisor(struct uart_port *port,
return quot;
}
static unsigned int serial8250_get_divisor(struct uart_port *port,
unsigned int baud,
unsigned int *frac)
{
if (port->get_divisor)
return port->get_divisor(port, baud, frac);
return serial8250_do_get_divisor(port, baud, frac);
}
static unsigned char serial8250_compute_lcr(struct uart_8250_port *up,
tcflag_t c_cflag)
{
@ -2570,7 +2580,7 @@ static unsigned char serial8250_compute_lcr(struct uart_8250_port *up,
return cval;
}
static void serial8250_set_divisor(struct uart_port *port, unsigned int baud,
static void serial8250_do_set_divisor(struct uart_port *port, unsigned int baud,
unsigned int quot, unsigned int quot_frac)
{
struct uart_8250_port *up = up_to_u8250p(port);
@ -2603,6 +2613,15 @@ static void serial8250_set_divisor(struct uart_port *port, unsigned int baud,
}
}
static void serial8250_set_divisor(struct uart_port *port, unsigned int baud,
unsigned int quot, unsigned int quot_frac)
{
if (port->set_divisor)
port->set_divisor(port, baud, quot, quot_frac);
else
serial8250_do_set_divisor(port, baud, quot, quot_frac);
}
static unsigned int serial8250_get_baud_rate(struct uart_port *port,
struct ktermios *termios,
struct ktermios *old)

7
include/linux/serial_core.h
View File

@ -127,6 +127,13 @@ struct uart_port {
struct ktermios *);
unsigned int (*get_mctrl)(struct uart_port *);
void (*set_mctrl)(struct uart_port *, unsigned int);
unsigned int (*get_divisor)(struct uart_port *,
unsigned int baud,
unsigned int *frac);
void (*set_divisor)(struct uart_port *,
unsigned int baud,
unsigned int quot,
unsigned int quot_frac);
int (*startup)(struct uart_port *port);
void (*shutdown)(struct uart_port *port);
void (*throttle)(struct uart_port *port);