1/*- 2 * Copyright (c) 2012, 2013 The FreeBSD Foundation 3 * All rights reserved. 4 * 5 * This software was developed by Oleksandr Rybalko under sponsorship 6 * from the FreeBSD Foundation. 7 * 8 * Redistribution and use in source and binary forms, with or without 9 * modification, are permitted provided that the following conditions 10 * are met: 11 * 1. Redistributions of source code must retain the above copyright 12 * notice, this list of conditions and the following disclaimer. 13 * 2. Redistributions in binary form must reproduce the above copyright 14 * notice, this list of conditions and the following disclaimer in the 15 * documentation and/or other materials provided with the distribution. 16 * 17 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 18 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 19 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 20 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 21 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 22 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 23 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 24 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 25 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 26 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 27 * SUCH DAMAGE. 28 */ 29 30/* Simple UART console driver for Freescale i.MX515 */ 31 32#include <sys/cdefs.h> 33__FBSDID("$FreeBSD$"); 34 35#include <sys/types.h> 36#include <sys/param.h> 37#include <sys/systm.h> 38#include <sys/cons.h> 39#include <sys/consio.h> 40#include <sys/kernel.h> 41 42/* Allow it to be predefined, to be able to use another UART for console */ 43#ifndef IMX_UART_BASE 44#define IMX_UART_BASE 0xe3fbc000 /* imx51 UART1 */ 45#endif 46 47#define IMX_RXD 0x00 48#define IMX_TXD 0x40 49 50#define IMX_UFCR 0x90 51#define IMX_USR1 0x94 52#define IMX_USR1_TRDY (1 << 13) 53 54#define IMX_USR2 0x98 55#define IMX_USR2_RDR (1 << 0) 56#define IMX_USR2_TXFE (1 << 14) 57#define IMX_USR2_TXDC (1 << 3) 58 59#define IMX_UTS 0xb4 60#define IMX_UTS_TXFULL (1 << 4) 61 62/* 63 * The base address of the uart registers. 64 * 65 * This is global so that it can be changed on the fly from the outside. For 66 * example, set imx_uart_base=physaddr and then call cninit() as the first two 67 * lines of initarm() and enjoy printf() availability through the tricky bits of 68 * startup. After initarm() switches from physical to virtual addressing, just 69 * set imx_uart_base=virtaddr and printf keeps working. 70 */ 71uint32_t imx_uart_base = IMX_UART_BASE; 72 73/* 74 * uart related funcs 75 */ 76static uint32_t 77ub_getreg(uint32_t off) 78{ 79 80 return *((volatile uint32_t *)(imx_uart_base + off)); 81} 82 83static void 84ub_setreg(uint32_t off, uint32_t val) 85{ 86 87 *((volatile uint32_t *)(imx_uart_base + off)) = val; 88} 89 90static int 91ub_tstc(void) 92{ 93 94 return ((ub_getreg(IMX_USR2) & IMX_USR2_RDR) ? 1 : 0); 95} 96 97static int 98ub_getc(void) 99{ 100 101 while (!ub_tstc()); 102 __asm __volatile("nop"); 103 104 return (ub_getreg(IMX_RXD) & 0xff); 105} 106 107static void 108ub_putc(unsigned char c) 109{ 110 111 if (c == '\n') 112 ub_putc('\r'); 113 114 while (ub_getreg(IMX_UTS) & IMX_UTS_TXFULL) 115 __asm __volatile("nop"); 116 117 ub_setreg(IMX_TXD, c); 118} 119 120static cn_probe_t uart_cnprobe; 121static cn_init_t uart_cninit; 122static cn_term_t uart_cnterm; 123static cn_getc_t uart_cngetc; 124static cn_putc_t uart_cnputc; 125static cn_grab_t uart_cngrab; 126static cn_ungrab_t uart_cnungrab; 127 128static void 129uart_cngrab(struct consdev *cp) 130{ 131 132} 133 134static void 135uart_cnungrab(struct consdev *cp) 136{ 137 138} 139 140 141static void 142uart_cnprobe(struct consdev *cp) 143{ 144 145 sprintf(cp->cn_name, "uart"); 146 cp->cn_pri = CN_NORMAL; 147} 148 149static void 150uart_cninit(struct consdev *cp) 151{ 152 153 /* Init fifo trigger levels to 32 bytes, refclock div to 2. */ 154 ub_setreg(IMX_UFCR, 0x00004210); 155} 156 157static void 158uart_cnputc(struct consdev *cp, int c) 159{ 160 161 ub_putc(c); 162} 163 164static int 165uart_cngetc(struct consdev * cp) 166{ 167 168 return ub_getc(); 169} 170 171static void 172uart_cnterm(struct consdev * cp) 173{ 174 175} 176 177CONSOLE_DRIVER(uart); 178