/* * serial.c -- KS8695 serial driver * * (C) Copyright 2004, Greg Ungerer <greg.ungerer@opengear.com> * * 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 */ #include <common.h> #include <asm/arch/platform.h> #ifndef CONFIG_SERIAL1 #error "Bad: you didn't configure serial ..." #endif DECLARE_GLOBAL_DATA_PTR; /* * Define the UART hardware register access structure. */ struct ks8695uart { unsigned int RX; /* 0x00 - Receive data (r) */ unsigned int TX; /* 0x04 - Transmit data (w) */ unsigned int FCR; /* 0x08 - Fifo Control (r/w) */ unsigned int LCR; /* 0x0c - Line Control (r/w) */ unsigned int MCR; /* 0x10 - Modem Control (r/w) */ unsigned int LSR; /* 0x14 - Line Status (r/w) */ unsigned int MSR; /* 0x18 - Modem Status (r/w) */ unsigned int BD; /* 0x1c - Baud Rate (r/w) */ unsigned int SR; /* 0x20 - Status (r/w) */ }; #define KS8695_UART_ADDR ((void *) (KS8695_IO_BASE + KS8695_UART_RX_BUFFER)) #define KS8695_UART_CLK 25000000 /* * Under some circumstances we want to be "quiet" and not issue any * serial output - though we want u-boot to otherwise work and behave * the same. By default be noisy. */ int serial_console = 1; void serial_setbrg(void) { volatile struct ks8695uart *uartp = KS8695_UART_ADDR; /* Set to global baud rate and 8 data bits, no parity, 1 stop bit*/ uartp->BD = KS8695_UART_CLK / gd->baudrate; uartp->LCR = KS8695_UART_LINEC_WLEN8; } int serial_init(void) { serial_console = 1; serial_setbrg(); return 0; } void serial_raw_putc(const char c) { volatile struct ks8695uart *uartp = KS8695_UART_ADDR; int i; for (i = 0; (i < 0x100000); i++) { if (uartp->LSR & KS8695_UART_LINES_TXFE) break; } uartp->TX = c; } void serial_putc(const char c) { if (serial_console) { serial_raw_putc(c); if (c == '\n') serial_raw_putc('\r'); } } int serial_tstc(void) { volatile struct ks8695uart *uartp = KS8695_UART_ADDR; if (serial_console) return ((uartp->LSR & KS8695_UART_LINES_RXFE) ? 1 : 0); return 0; } void serial_puts(const char *s) { char c; while ((c = *s++) != 0) serial_putc(c); } int serial_getc(void) { volatile struct ks8695uart *uartp = KS8695_UART_ADDR; while ((uartp->LSR & KS8695_UART_LINES_RXFE) == 0) ; return (uartp->RX); }