1 // SPDX-License-Identifier: GPL-2.0+
2 /*
3  * [partely copied from arch/arm/cpu/arm926ejs/at91/arm9260_devices.c]
4  *
5  * (C) Copyright 2011
6  * Andreas Bießmann <andreas@biessmann.org>
7  *
8  * (C) Copyright 2007-2008
9  * Stelian Pop <stelian@popies.net>
10  * Lead Tech Design <www.leadtechdesign.com>
11  */
12 
13 #include <common.h>
14 #include <asm/io.h>
15 #include <asm/arch/at91_common.h>
16 #include <asm/arch/clk.h>
17 #include <asm/arch/gpio.h>
18 
19 /*
20  * if CONFIG_AT91_GPIO_PULLUP ist set, keep pullups on on all
21  * peripheral pins. Good to have if hardware is soldered optionally
22  * or in case of SPI no slave is selected. Avoid lines to float
23  * needlessly. Use a short local PUP define.
24  *
25  * Due to errata "TXD floats when CTS is inactive" pullups are always
26  * on for TXD pins.
27  */
28 #ifdef CONFIG_AT91_GPIO_PULLUP
29 # define PUP CONFIG_AT91_GPIO_PULLUP
30 #else
31 # define PUP 0
32 #endif
33 
34 void at91_serial0_hw_init(void)
35 {
36 	at91_set_a_periph(AT91_PIO_PORTA, 17, 1);		/* TXD0 */
37 	at91_set_a_periph(AT91_PIO_PORTA, 18, PUP);		/* RXD0 */
38 	at91_periph_clk_enable(ATMEL_ID_USART0);
39 }
40 
41 void at91_serial1_hw_init(void)
42 {
43 	at91_set_a_periph(AT91_PIO_PORTB, 20, PUP);		/* RXD1 */
44 	at91_set_a_periph(AT91_PIO_PORTB, 21, 1);		/* TXD1 */
45 	at91_periph_clk_enable(ATMEL_ID_USART1);
46 }
47 
48 void at91_serial2_hw_init(void)
49 {
50 	at91_set_a_periph(AT91_PIO_PORTA, 22, PUP);		/* RXD2 */
51 	at91_set_a_periph(AT91_PIO_PORTA, 23, 1);		/* TXD2 */
52 	at91_periph_clk_enable(ATMEL_ID_USART2);
53 }
54 
55 void at91_seriald_hw_init(void)
56 {
57 	at91_set_a_periph(AT91_PIO_PORTA, 30, PUP);		/* DRXD */
58 	at91_set_a_periph(AT91_PIO_PORTA, 31, 1);		/* DTXD */
59 	/* writing SYS to PCER has no effect on AT91RM9200 */
60 }
61