1 /* 2 * (C) Copyright 2008 Michal Simek <monstr@monstr.eu> 3 * Clean driver and add xilinx constant from header file 4 * 5 * (C) Copyright 2004 Atmark Techno, Inc. 6 * Yasushi SHOJI <yashi@atmark-techno.com> 7 * 8 * See file CREDITS for list of people who contributed to this 9 * project. 10 * 11 * This program is free software; you can redistribute it and/or 12 * modify it under the terms of the GNU General Public License as 13 * published by the Free Software Foundation; either version 2 of 14 * the License, or (at your option) any later version. 15 * 16 * This program is distributed in the hope that it will be useful, 17 * but WITHOUT ANY WARRANTY; without even the implied warranty of 18 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 19 * GNU General Public License for more details. 20 * 21 * You should have received a copy of the GNU General Public License 22 * along with this program; if not, write to the Free Software 23 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, 24 * MA 02111-1307 USA 25 */ 26 27 #include <config.h> 28 #include <asm/io.h> 29 30 #ifdef CONFIG_XILINX_UARTLITE 31 32 #define RX_FIFO_OFFSET 0 /* receive FIFO, read only */ 33 #define TX_FIFO_OFFSET 4 /* transmit FIFO, write only */ 34 #define STATUS_REG_OFFSET 8 /* status register, read only */ 35 36 #define SR_TX_FIFO_FULL 0x08 /* transmit FIFO full */ 37 #define SR_RX_FIFO_VALID_DATA 0x01 /* data in receive FIFO */ 38 #define SR_RX_FIFO_FULL 0x02 /* receive FIFO full */ 39 40 #define UARTLITE_STATUS (CONFIG_SERIAL_BASE + STATUS_REG_OFFSET) 41 #define UARTLITE_TX_FIFO (CONFIG_SERIAL_BASE + TX_FIFO_OFFSET) 42 #define UARTLITE_RX_FIFO (CONFIG_SERIAL_BASE + RX_FIFO_OFFSET) 43 44 int serial_init(void) 45 { 46 /* FIXME: Nothing for now. We should initialize fifo, etc */ 47 return 0; 48 } 49 50 void serial_setbrg(void) 51 { 52 /* FIXME: what's this for? */ 53 } 54 55 void serial_putc(const char c) 56 { 57 if (c == '\n') 58 serial_putc('\r'); 59 while (in_be32(UARTLITE_STATUS) & SR_TX_FIFO_FULL); 60 out_be32(UARTLITE_TX_FIFO, (unsigned char) (c & 0xff)); 61 } 62 63 void serial_puts(const char * s) 64 { 65 while (*s) { 66 serial_putc(*s++); 67 } 68 } 69 70 int serial_getc(void) 71 { 72 while (!(in_be32(UARTLITE_STATUS) & SR_RX_FIFO_VALID_DATA)); 73 return in_be32(UARTLITE_RX_FIFO) & 0xff; 74 } 75 76 int serial_tstc(void) 77 { 78 return (in_be32(UARTLITE_STATUS) & SR_RX_FIFO_VALID_DATA); 79 } 80 81 #endif /* CONFIG_MICROBLZE */ 82