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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 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 | /* * (C) Copyright 2004-2007 Freescale Semiconductor, Inc. * TsiChung Liew, Tsi-Chung.Liew@freescale.com. * * See file CREDITS for list of people who contributed to this * project. * * This program is free software; you can redistribute it and/or * modify it under the terms of the GNU General Public License as * published by the Free Software Foundation; either version 2 of * the License, or (at your option) any later version. * * This program is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the * GNU General Public License for more details. * * You should have received a copy of the GNU General Public License * along with this program; if not, write to the Free Software * Foundation, Inc., 59 Temple Place, Suite 330, Boston, * MA 02111-1307 USA * */ /* * Minimal serial functions needed to use one of the uart ports * as serial console interface. */ #include <common.h> #ifdef CONFIG_MCFUART #include <asm/immap.h> #include <asm/uart.h> DECLARE_GLOBAL_DATA_PTR; extern void uart_port_conf(void); int serial_init(void) { volatile uart_t *uart; u32 counter; uart = (volatile uart_t *)(CFG_UART_BASE); uart_port_conf(); /* write to SICR: SIM2 = uart mode,dcd does not affect rx */ uart->ucr = UART_UCR_RESET_RX; uart->ucr = UART_UCR_RESET_TX; uart->ucr = UART_UCR_RESET_ERROR; uart->ucr = UART_UCR_RESET_MR; __asm__("nop"); uart->uimr = 0; /* write to CSR: RX/TX baud rate from timers */ uart->ucsr = (UART_UCSR_RCS_SYS_CLK | UART_UCSR_TCS_SYS_CLK); uart->umr = (UART_UMR_BC_8 | UART_UMR_PM_NONE); uart->umr = UART_UMR_SB_STOP_BITS_1; /* Setting up BaudRate */ counter = (u32) (gd->bus_clk / (gd->baudrate)); counter >>= 5; /* write to CTUR: divide counter upper byte */ uart->ubg1 = (u8) ((counter & 0xff00) >> 8); /* write to CTLR: divide counter lower byte */ uart->ubg2 = (u8) (counter & 0x00ff); uart->ucr = (UART_UCR_RX_ENABLED | UART_UCR_TX_ENABLED); return (0); } void serial_putc(const char c) { volatile uart_t *uart = (volatile uart_t *)(CFG_UART_BASE); if (c == '\n') serial_putc('\r'); /* Wait for last character to go. */ while (!(uart->usr & UART_USR_TXRDY)) ; uart->utb = c; } void serial_puts(const char *s) { while (*s) { serial_putc(*s++); } } int serial_getc(void) { volatile uart_t *uart = (volatile uart_t *)(CFG_UART_BASE); /* Wait for a character to arrive. */ while (!(uart->usr & UART_USR_RXRDY)) ; return uart->urb; } int serial_tstc(void) { volatile uart_t *uart = (volatile uart_t *)(CFG_UART_BASE); return (uart->usr & UART_USR_RXRDY); } void serial_setbrg(void) { volatile uart_t *uart = (volatile uart_t *)(CFG_UART_BASE); u32 counter; counter = ((gd->bus_clk / gd->baudrate)) >> 5; counter++; /* write to CTUR: divide counter upper byte */ uart->ubg1 = ((counter & 0xff00) >> 8); /* write to CTLR: divide counter lower byte */ uart->ubg2 = (counter & 0x00ff); uart->ucr = UART_UCR_RESET_RX; uart->ucr = UART_UCR_RESET_TX; uart->ucr = UART_UCR_RX_ENABLED | UART_UCR_TX_ENABLED; } #endif /* CONFIG_MCFUART */ |