1 /* $Id: common.c,v 1.4 2013/10/07 17:36:40 matt Exp $ */ 2 3 /* 4 * Copyright (c) 2012 The NetBSD Foundation, Inc. 5 * All rights reserved. 6 * 7 * This code is derived from software contributed to The NetBSD Foundation 8 * by Petri Laakso. 9 * 10 * Redistribution and use in source and binary forms, with or without 11 * modification, are permitted provided that the following conditions 12 * are met: 13 * 1. Redistributions of source code must retain the above copyright 14 * notice, this list of conditions and the following disclaimer. 15 * 2. Redistributions in binary form must reproduce the above copyright 16 * notice, this list of conditions and the following disclaimer in the 17 * documentation and/or other materials provided with the distribution. 18 * 19 * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS 20 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED 21 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 22 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS 23 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 24 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 25 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 26 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 27 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 28 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 29 * POSSIBILITY OF SUCH DAMAGE. 30 */ 31 32 #include <sys/param.h> 33 #include <sys/types.h> 34 #include <sys/cdefs.h> 35 36 #include <lib/libsa/stand.h> 37 38 #include <arm/imx/imx23_digctlreg.h> 39 #include <arm/imx/imx23_uartdbgreg.h> 40 41 #include "common.h" 42 43 /* 44 * Delay us microseconds. 45 */ 46 void 47 delay(unsigned int us) 48 { 49 volatile uint32_t *us_r; 50 51 us_r = (uint32_t *)(HW_DIGCTL_BASE + HW_DIGCTL_MICROSECONDS); 52 53 *us_r = 0; 54 while (*us_r < us) 55 ; 56 57 return; 58 } 59 60 /* 61 * Write character c to debug UART. 62 */ 63 void 64 putchar(int c) 65 { 66 volatile uint8_t *fr_r, *dr_r; 67 68 fr_r = (uint8_t *)(HW_UARTDBG_BASE + HW_UARTDBGFR); 69 dr_r = (uint8_t *)(HW_UARTDBG_BASE + HW_UARTDBGDR); 70 71 /* Wait until transmit FIFO has space for the new character. */ 72 while (*fr_r & HW_UARTDBGFR_TXFF) 73 ; 74 75 *dr_r = c; 76 #ifdef DIAGNOSTIC 77 78 /* Flush: Wait until transmit FIFO contents are written to UART. */ 79 while (!(*fr_r & HW_UARTDBGFR_TXFE)) 80 ; 81 #endif 82 83 return; 84 } 85 86 /* 87 * Read character from debug UART. 88 */ 89 int 90 getchar(void) 91 { 92 volatile uint8_t *fr_r, *dr_r; 93 94 fr_r = (uint8_t *)(HW_UARTDBG_BASE + HW_UARTDBGFR); 95 dr_r = (uint8_t *)(HW_UARTDBG_BASE + HW_UARTDBGDR); 96 97 /* Wait until receive FIFO has character(s) */ 98 while (*fr_r & HW_UARTDBGFR_RXFE) 99 ; 100 101 return *dr_r; 102 } 103 104 void 105 vpanic(const char *fmt, va_list ap) 106 { 107 printf(fmt, ap); 108 for(;;); 109 110 /* NOTREACHED */ 111 } 112