1 /*
2  * [partely copied from arch/arm/cpu/arm926ejs/at91/arm9260_devices.c]
3  *
4  * (C) Copyright 2011
5  * Andreas Bießmann <andreas@biessmann.org>
6  *
7  * (C) Copyright 2007-2008
8  * Stelian Pop <stelian@popies.net>
9  * Lead Tech Design <www.leadtechdesign.com>
10  *
11  * SPDX-License-Identifier:	GPL-2.0+
12  */
13 
14 #include <common.h>
15 #include <asm/io.h>
16 #include <asm/arch/at91_common.h>
17 #include <asm/arch/clk.h>
18 #include <asm/arch/gpio.h>
19 
20 /*
21  * if CONFIG_AT91_GPIO_PULLUP ist set, keep pullups on on all
22  * peripheral pins. Good to have if hardware is soldered optionally
23  * or in case of SPI no slave is selected. Avoid lines to float
24  * needlessly. Use a short local PUP define.
25  *
26  * Due to errata "TXD floats when CTS is inactive" pullups are always
27  * on for TXD pins.
28  */
29 #ifdef CONFIG_AT91_GPIO_PULLUP
30 # define PUP CONFIG_AT91_GPIO_PULLUP
31 #else
32 # define PUP 0
33 #endif
34 
35 void at91_serial0_hw_init(void)
36 {
37 	at91_set_a_periph(AT91_PIO_PORTA, 17, 1);		/* TXD0 */
38 	at91_set_a_periph(AT91_PIO_PORTA, 18, PUP);		/* RXD0 */
39 	at91_periph_clk_enable(ATMEL_ID_USART0);
40 }
41 
42 void at91_serial1_hw_init(void)
43 {
44 	at91_set_a_periph(AT91_PIO_PORTB, 20, PUP);		/* RXD1 */
45 	at91_set_a_periph(AT91_PIO_PORTB, 21, 1);		/* TXD1 */
46 	at91_periph_clk_enable(ATMEL_ID_USART1);
47 }
48 
49 void at91_serial2_hw_init(void)
50 {
51 	at91_set_a_periph(AT91_PIO_PORTA, 22, PUP);		/* RXD2 */
52 	at91_set_a_periph(AT91_PIO_PORTA, 23, 1);		/* TXD2 */
53 	at91_periph_clk_enable(ATMEL_ID_USART2);
54 }
55 
56 void at91_seriald_hw_init(void)
57 {
58 	at91_set_a_periph(AT91_PIO_PORTA, 30, PUP);		/* DRXD */
59 	at91_set_a_periph(AT91_PIO_PORTA, 31, 1);		/* DTXD */
60 	/* writing SYS to PCER has no effect on AT91RM9200 */
61 }
62