1 /* $NetBSD: ns16550.c,v 1.5 2008/04/29 15:24:50 tsutsui Exp $ */ 2 3 /*- 4 * Copyright (c) 2008 Izumi Tsutsui. All rights reserved. 5 * 6 * Redistribution and use in source and binary forms, with or without 7 * modification, are permitted provided that the following conditions 8 * are met: 9 * 1. Redistributions of source code must retain the above copyright 10 * notice, this list of conditions and the following disclaimer. 11 * 2. Redistributions in binary form must reproduce the above copyright 12 * notice, this list of conditions and the following disclaimer in the 13 * documentation and/or other materials provided with the distribution. 14 * 15 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR 16 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES 17 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 18 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, 19 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT 20 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 21 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 22 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 23 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF 24 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 25 */ 26 27 #ifdef CONS_SERIAL 28 29 #include <lib/libsa/stand.h> 30 #include <lib/libkern/libkern.h> 31 32 #include <dev/ic/comreg.h> 33 34 #include <machine/cpu.h> 35 36 #include "boot.h" 37 #include "ns16550.h" 38 39 #define CSR_READ(base, reg) (*(volatile uint8_t *)((base) + (reg))) 40 #define CSR_WRITE(base, reg, val) \ 41 do { \ 42 *(volatile uint8_t *)((base) + (reg)) = (val); \ 43 } while (/* CONSTCOND */ 0) 44 45 void * 46 com_init(int addr, int speed) 47 { 48 uint8_t *com_port; 49 50 com_port = (void *)MIPS_PHYS_TO_KSEG1(COM_BASE + addr); 51 52 CSR_WRITE(com_port, com_lctl, LCR_DLAB); 53 speed = comspeed(speed); 54 CSR_WRITE(com_port, com_dlbl, speed); 55 CSR_WRITE(com_port, com_dlbh, speed >> 8); 56 57 CSR_WRITE(com_port, com_lctl, LCR_PNONE | LCR_8BITS); 58 CSR_WRITE(com_port, com_mcr, MCR_RTS | MCR_DTR); 59 CSR_WRITE(com_port, com_fifo, 60 FIFO_XMT_RST | FIFO_RCV_RST | FIFO_ENABLE); 61 CSR_WRITE(com_port, com_ier, 0); 62 63 return com_port; 64 } 65 66 void 67 com_putc(void *dev, int c) 68 { 69 volatile uint8_t *com_port = dev; 70 71 while ((CSR_READ(com_port, com_lsr) & LSR_TXRDY) == 0) 72 ; 73 74 CSR_WRITE(com_port, com_data, c); 75 } 76 77 int 78 com_getc(void *dev) 79 { 80 volatile uint8_t *com_port = dev; 81 82 while ((CSR_READ(com_port, com_lsr) & LSR_RXRDY) == 0) 83 ; 84 85 return CSR_READ(com_port, com_data); 86 } 87 88 int 89 com_scankbd(void *dev) 90 { 91 volatile uint8_t *com_port = dev; 92 93 if ((CSR_READ(com_port, com_lsr) & LSR_RXRDY) == 0) 94 return -1; 95 96 return CSR_READ(com_port, com_data); 97 } 98 #endif /* CONS_SERIAL */ 99