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
at91_serial0_hw_init(void)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
at91_serial1_hw_init(void)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
at91_serial2_hw_init(void)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
at91_seriald_hw_init(void)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