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/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