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