LXR linux/arch/sh/kernel/cpu/sh3/serial-sh770x.c

   1// SPDX-License-Identifier: GPL-2.0
   2#include <linux/serial_sci.h>
   3#include <linux/serial_core.h>
   4#include <linux/io.h>
   5#include <cpu/serial.h>
   6
   7#define SCPCR 0xA4000116
   8#define SCPDR 0xA4000136
   9
  10static void sh770x_sci_init_pins(struct uart_port *port, unsigned int cflag)
  11{
  12        unsigned short data;
  13
  14        /* We need to set SCPCR to enable RTS/CTS */
  15        data = __raw_readw(SCPCR);
  16        /* Clear out SCP7MD1,0, SCP6MD1,0, SCP4MD1,0*/
  17        __raw_writew(data & 0x0fcf, SCPCR);
  18
  19        if (!(cflag & CRTSCTS)) {
  20                /* We need to set SCPCR to enable RTS/CTS */
  21                data = __raw_readw(SCPCR);
  22                /* Clear out SCP7MD1,0, SCP4MD1,0,
  23                   Set SCP6MD1,0 = {01} (output)  */
  24                __raw_writew((data & 0x0fcf) | 0x1000, SCPCR);
  25
  26                data = __raw_readb(SCPDR);
  27                /* Set /RTS2 (bit6) = 0 */
  28                __raw_writeb(data & 0xbf, SCPDR);
  29        }
  30}
  31
  32struct plat_sci_port_ops sh770x_sci_port_ops = {
  33        .init_pins      = sh770x_sci_init_pins,
  34};
  35