1*2bd806feSTsiChungLiew /* 2*2bd806feSTsiChungLiew * (C) Copyright 2004-2007 Freescale Semiconductor, Inc. 3*2bd806feSTsiChungLiew * TsiChung Liew, Tsi-Chung.Liew@freescale.com. 4*2bd806feSTsiChungLiew * 5*2bd806feSTsiChungLiew * See file CREDITS for list of people who contributed to this 6*2bd806feSTsiChungLiew * project. 7*2bd806feSTsiChungLiew * 8*2bd806feSTsiChungLiew * This program is free software; you can redistribute it and/or 9*2bd806feSTsiChungLiew * modify it under the terms of the GNU General Public License as 10*2bd806feSTsiChungLiew * published by the Free Software Foundation; either version 2 of 11*2bd806feSTsiChungLiew * the License, or (at your option) any later version. 12*2bd806feSTsiChungLiew * 13*2bd806feSTsiChungLiew * This program is distributed in the hope that it will be useful, 14*2bd806feSTsiChungLiew * but WITHOUT ANY WARRANTY; without even the implied warranty of 15*2bd806feSTsiChungLiew * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 16*2bd806feSTsiChungLiew * GNU General Public License for more details. 17*2bd806feSTsiChungLiew * 18*2bd806feSTsiChungLiew * You should have received a copy of the GNU General Public License 19*2bd806feSTsiChungLiew * along with this program; if not, write to the Free Software 20*2bd806feSTsiChungLiew * Foundation, Inc., 59 Temple Place, Suite 330, Boston, 21*2bd806feSTsiChungLiew * MA 02111-1307 USA 22*2bd806feSTsiChungLiew * 23*2bd806feSTsiChungLiew */ 24*2bd806feSTsiChungLiew 25*2bd806feSTsiChungLiew /* 26*2bd806feSTsiChungLiew * Minimal serial functions needed to use one of the uart ports 27*2bd806feSTsiChungLiew * as serial console interface. 28*2bd806feSTsiChungLiew */ 29*2bd806feSTsiChungLiew 30*2bd806feSTsiChungLiew #include <common.h> 31*2bd806feSTsiChungLiew #include <asm/immap.h> 32*2bd806feSTsiChungLiew #include <asm/uart.h> 33*2bd806feSTsiChungLiew 34*2bd806feSTsiChungLiew DECLARE_GLOBAL_DATA_PTR; 35*2bd806feSTsiChungLiew 36*2bd806feSTsiChungLiew #ifdef CONFIG_MCFSERIAL 37*2bd806feSTsiChungLiew int serial_init(void) 38*2bd806feSTsiChungLiew { 39*2bd806feSTsiChungLiew volatile uart_t *uart; 40*2bd806feSTsiChungLiew u32 counter; 41*2bd806feSTsiChungLiew 42*2bd806feSTsiChungLiew uart = (volatile uart_t *)(CFG_UART_BASE); 43*2bd806feSTsiChungLiew 44*2bd806feSTsiChungLiew /* write to SICR: SIM2 = uart mode,dcd does not affect rx */ 45*2bd806feSTsiChungLiew uart->ucr = UART_UCR_RESET_RX; 46*2bd806feSTsiChungLiew uart->ucr = UART_UCR_RESET_TX; 47*2bd806feSTsiChungLiew uart->ucr = UART_UCR_RESET_ERROR; 48*2bd806feSTsiChungLiew uart->ucr = UART_UCR_RESET_MR; 49*2bd806feSTsiChungLiew __asm__("nop"); 50*2bd806feSTsiChungLiew 51*2bd806feSTsiChungLiew uart->uimr = 0; 52*2bd806feSTsiChungLiew 53*2bd806feSTsiChungLiew /* write to CSR: RX/TX baud rate from timers */ 54*2bd806feSTsiChungLiew uart->ucsr = (UART_UCSR_RCS_SYS_CLK | UART_UCSR_TCS_SYS_CLK); 55*2bd806feSTsiChungLiew 56*2bd806feSTsiChungLiew uart->umr = (UART_UMR_BC_8 | UART_UMR_PM_NONE); 57*2bd806feSTsiChungLiew uart->umr = UART_UMR_SB_STOP_BITS_1; 58*2bd806feSTsiChungLiew 59*2bd806feSTsiChungLiew /* Setting up BaudRate */ 60*2bd806feSTsiChungLiew counter = (u32) (gd->bus_clk / (gd->baudrate)); 61*2bd806feSTsiChungLiew counter >>= 5; 62*2bd806feSTsiChungLiew 63*2bd806feSTsiChungLiew /* write to CTUR: divide counter upper byte */ 64*2bd806feSTsiChungLiew uart->ubg1 = (u8) ((counter & 0xff00) >> 8); 65*2bd806feSTsiChungLiew /* write to CTLR: divide counter lower byte */ 66*2bd806feSTsiChungLiew uart->ubg2 = (u8) (counter & 0x00ff); 67*2bd806feSTsiChungLiew 68*2bd806feSTsiChungLiew uart->ucr = (UART_UCR_RX_ENABLED | UART_UCR_TX_ENABLED); 69*2bd806feSTsiChungLiew 70*2bd806feSTsiChungLiew return (0); 71*2bd806feSTsiChungLiew } 72*2bd806feSTsiChungLiew 73*2bd806feSTsiChungLiew void serial_putc(const char c) 74*2bd806feSTsiChungLiew { 75*2bd806feSTsiChungLiew volatile uart_t *uart = (volatile uart_t *)(CFG_UART_BASE); 76*2bd806feSTsiChungLiew 77*2bd806feSTsiChungLiew if (c == '\n') 78*2bd806feSTsiChungLiew serial_putc('\r'); 79*2bd806feSTsiChungLiew 80*2bd806feSTsiChungLiew /* Wait for last character to go. */ 81*2bd806feSTsiChungLiew while (!(uart->usr & UART_USR_TXRDY)) ; 82*2bd806feSTsiChungLiew 83*2bd806feSTsiChungLiew uart->utb = c; 84*2bd806feSTsiChungLiew } 85*2bd806feSTsiChungLiew 86*2bd806feSTsiChungLiew void serial_puts(const char *s) 87*2bd806feSTsiChungLiew { 88*2bd806feSTsiChungLiew while (*s) { 89*2bd806feSTsiChungLiew serial_putc(*s++); 90*2bd806feSTsiChungLiew } 91*2bd806feSTsiChungLiew } 92*2bd806feSTsiChungLiew 93*2bd806feSTsiChungLiew int serial_getc(void) 94*2bd806feSTsiChungLiew { 95*2bd806feSTsiChungLiew volatile uart_t *uart = (volatile uart_t *)(CFG_UART_BASE); 96*2bd806feSTsiChungLiew 97*2bd806feSTsiChungLiew /* Wait for a character to arrive. */ 98*2bd806feSTsiChungLiew while (!(uart->usr & UART_USR_RXRDY)) ; 99*2bd806feSTsiChungLiew return uart->urb; 100*2bd806feSTsiChungLiew } 101*2bd806feSTsiChungLiew 102*2bd806feSTsiChungLiew int serial_tstc(void) 103*2bd806feSTsiChungLiew { 104*2bd806feSTsiChungLiew volatile uart_t *uart = (volatile uart_t *)(CFG_UART_BASE); 105*2bd806feSTsiChungLiew 106*2bd806feSTsiChungLiew return (uart->usr & UART_USR_RXRDY); 107*2bd806feSTsiChungLiew } 108*2bd806feSTsiChungLiew 109*2bd806feSTsiChungLiew void serial_setbrg(void) 110*2bd806feSTsiChungLiew { 111*2bd806feSTsiChungLiew volatile uart_t *uart = (volatile uart_t *)(CFG_UART_BASE); 112*2bd806feSTsiChungLiew u32 counter; 113*2bd806feSTsiChungLiew 114*2bd806feSTsiChungLiew counter = ((gd->bus_clk / gd->baudrate)) >> 5; 115*2bd806feSTsiChungLiew counter++; 116*2bd806feSTsiChungLiew 117*2bd806feSTsiChungLiew /* write to CTUR: divide counter upper byte */ 118*2bd806feSTsiChungLiew uart->ubg1 = ((counter & 0xff00) >> 8); 119*2bd806feSTsiChungLiew /* write to CTLR: divide counter lower byte */ 120*2bd806feSTsiChungLiew uart->ubg2 = (counter & 0x00ff); 121*2bd806feSTsiChungLiew 122*2bd806feSTsiChungLiew uart->ucr = UART_UCR_RESET_RX; 123*2bd806feSTsiChungLiew uart->ucr = UART_UCR_RESET_TX; 124*2bd806feSTsiChungLiew 125*2bd806feSTsiChungLiew uart->ucr = UART_UCR_RX_ENABLED | UART_UCR_TX_ENABLED; 126*2bd806feSTsiChungLiew } 127*2bd806feSTsiChungLiew #endif /* CONFIG_MCFSERIAL */ 128