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
  10 static 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
  32 struct plat_sci_port_ops sh770x_sci_port_ops = {
  33         .init_pins      = sh770x_sci_init_pins,
  34 };