CHIP-linux-libre/arch/sh/kernel/cpu/sh3/serial-sh7710.c

#include <linux/serial_sci.h>
#include <linux/serial_core.h>
#include <linux/io.h>
#include <cpu/serial.h>

#define PACR 0xa4050100
#define PBCR 0xa4050102

static void sh7710_sci_init_pins(struct uart_port *port, unsigned int cflag)
{
	if (port->mapbase == 0xA4400000) {
		__raw_writew(__raw_readw(PACR) & 0xffc0, PACR);
		__raw_writew(__raw_readw(PBCR) & 0x0fff, PBCR);
	} else if (port->mapbase == 0xA4410000)
		__raw_writew(__raw_readw(PBCR) & 0xf003, PBCR);
}

struct plat_sci_port_ops sh7710_sci_port_ops = {
	.init_pins	= sh7710_sci_init_pins,
};