summaryrefslogtreecommitdiff
path: root/arch/arm/mach-at91/arm920t/at91rm9200_devices.c
blob: f139b9167dc8ba5bc37f7fa5ddc941b5dcd35084 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
/*
 * [partely copied from arch/arm/cpu/arm926ejs/at91/arm9260_devices.c]
 *
 * (C) Copyright 2011
 * Andreas Bießmann <andreas@biessmann.org>
 *
 * (C) Copyright 2007-2008
 * Stelian Pop <stelian@popies.net>
 * Lead Tech Design <www.leadtechdesign.com>
 *
 * SPDX-License-Identifier:	GPL-2.0+
 */

#include <common.h>
#include <asm/io.h>
#include <asm/arch/at91_common.h>
#include <asm/arch/clk.h>
#include <asm/arch/gpio.h>

/*
 * if CONFIG_AT91_GPIO_PULLUP ist set, keep pullups on on all
 * peripheral pins. Good to have if hardware is soldered optionally
 * or in case of SPI no slave is selected. Avoid lines to float
 * needlessly. Use a short local PUP define.
 *
 * Due to errata "TXD floats when CTS is inactive" pullups are always
 * on for TXD pins.
 */
#ifdef CONFIG_AT91_GPIO_PULLUP
# define PUP CONFIG_AT91_GPIO_PULLUP
#else
# define PUP 0
#endif

void at91_serial0_hw_init(void)
{
	at91_set_a_periph(AT91_PIO_PORTA, 17, 1);		/* TXD0 */
	at91_set_a_periph(AT91_PIO_PORTA, 18, PUP);		/* RXD0 */
	at91_periph_clk_enable(ATMEL_ID_USART0);
}

void at91_serial1_hw_init(void)
{
	at91_set_a_periph(AT91_PIO_PORTB, 20, PUP);		/* RXD1 */
	at91_set_a_periph(AT91_PIO_PORTB, 21, 1);		/* TXD1 */
	at91_periph_clk_enable(ATMEL_ID_USART1);
}

void at91_serial2_hw_init(void)
{
	at91_set_a_periph(AT91_PIO_PORTA, 22, PUP);		/* RXD2 */
	at91_set_a_periph(AT91_PIO_PORTA, 23, 1);		/* TXD2 */
	at91_periph_clk_enable(ATMEL_ID_USART2);
}

void at91_seriald_hw_init(void)
{
	at91_set_a_periph(AT91_PIO_PORTA, 30, PUP);		/* DRXD */
	at91_set_a_periph(AT91_PIO_PORTA, 31, 1);		/* DTXD */
	/* writing SYS to PCER has no effect on AT91RM9200 */
}