| b.liu | e958203 | 2025-04-17 19:18:16 +0800 | [diff] [blame^] | 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 | }; |