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 } 68