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 */ 71 uint32_t imx_uart_base = IMX_UART_BASE; 72 73 /* 74 * uart related funcs 75 */ 76 static uint32_t 77 ub_getreg(uint32_t off) 78 { 79 80 return *((volatile uint32_t *)(imx_uart_base + off)); 81 } 82 83 static void 84 ub_setreg(uint32_t off, uint32_t val) 85 { 86 87 *((volatile uint32_t *)(imx_uart_base + off)) = val; 88 } 89 90 static int 91 ub_tstc(void) 92 { 93 94 return ((ub_getreg(IMX_USR2) & IMX_USR2_RDR) ? 1 : 0); 95 } 96 97 static int 98 ub_getc(void) 99 { 100 101 while (!ub_tstc()); 102 __asm __volatile("nop"); 103 104 return (ub_getreg(IMX_RXD) & 0xff); 105 } 106 107 static void 108 ub_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 } 119 120 static cn_probe_t uart_cnprobe; 121 static cn_init_t uart_cninit; 122 static cn_term_t uart_cnterm; 123 static cn_getc_t uart_cngetc; 124 static cn_putc_t uart_cnputc; 125 static cn_grab_t uart_cngrab; 126 static cn_ungrab_t uart_cnungrab; 127 128 static void 129 uart_cngrab(struct consdev *cp) 130 { 131 132 } 133 134 static void 135 uart_cnungrab(struct consdev *cp) 136 { 137 138 } 139 140 141 static void 142 uart_cnprobe(struct consdev *cp) 143 { 144 145 sprintf(cp->cn_name, "uart"); 146 cp->cn_pri = CN_NORMAL; 147 } 148 149 static void 150 uart_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 } 156 157 static void 158 uart_cnputc(struct consdev *cp, int c) 159 { 160 161 ub_putc(c); 162 } 163 164 static int 165 uart_cngetc(struct consdev * cp) 166 { 167 168 return ub_getc(); 169 } 170 171 static void 172 uart_cnterm(struct consdev * cp) 173 { 174 175 } 176 177 CONSOLE_DRIVER(uart); 178