arch/arm/cpu/arm920t/at91/at91rm9200_devices.c

   1 /*
   2  * [partely copied from arch/arm/cpu/arm926ejs/at91/arm9260_devices.c]
   3  *
   4  * (C) Copyright 2011
   5  * Andreas Bießmann <andreas.devel@googlemail.com>
   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/at91_pmc.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_pmc_t      *pmc    = (at91_pmc_t *)ATMEL_BASE_PMC;
  38
  39         at91_set_a_periph(AT91_PIO_PORTA, 17, 1);               /* TXD0 */
  40         at91_set_a_periph(AT91_PIO_PORTA, 18, PUP);             /* RXD0 */
  41         writel(1 << ATMEL_ID_USART0, &pmc->pcer);
  42 }
  43
  44 void at91_serial1_hw_init(void)
  45 {
  46         at91_pmc_t      *pmc    = (at91_pmc_t *)ATMEL_BASE_PMC;
  47
  48         at91_set_a_periph(AT91_PIO_PORTB, 20, PUP);             /* RXD1 */
  49         at91_set_a_periph(AT91_PIO_PORTB, 21, 1);               /* TXD1 */
  50         writel(1 << ATMEL_ID_USART1, &pmc->pcer);
  51 }
  52
  53 void at91_serial2_hw_init(void)
  54 {
  55         at91_pmc_t      *pmc    = (at91_pmc_t *)ATMEL_BASE_PMC;
  56
  57         at91_set_a_periph(AT91_PIO_PORTA, 22, PUP);             /* RXD2 */
  58         at91_set_a_periph(AT91_PIO_PORTA, 23, 1);               /* TXD2 */
  59         writel(1 << ATMEL_ID_USART2, &pmc->pcer);
  60 }
  61
  62 void at91_seriald_hw_init(void)
  63 {
  64         at91_set_a_periph(AT91_PIO_PORTA, 30, PUP);             /* DRXD */
  65         at91_set_a_periph(AT91_PIO_PORTA, 31, 1);               /* DTXD */
  66         /* writing SYS to PCER has no effect on AT91RM9200 */
  67 }