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/cdefs.h> 32 __FBSDID("$FreeBSD$"); 33 34 #include <sys/types.h> 35 #include <sys/param.h> 36 #include <sys/systm.h> 37 #include <sys/cons.h> 38 #include <sys/consio.h> 39 #include <sys/kernel.h> 40 41 /* Allow it to be predefined, to be able to use another UART for console */ 42 #ifndef IMX_UART_BASE 43 #define IMX_UART_BASE 0xe3fbc000 /* imx51 UART1 */ 44 #endif 45 46 #define IMX_RXD 0x00 47 #define IMX_TXD 0x40 48 49 #define IMX_UFCR 0x90 50 #define IMX_USR1 0x94 51 #define IMX_USR1_TRDY (1 << 13) 52 53 #define IMX_USR2 0x98 54 #define IMX_USR2_RDR (1 << 0) 55 #define IMX_USR2_TXFE (1 << 14) 56 #define IMX_USR2_TXDC (1 << 3) 57 58 #define IMX_UTS 0xb4 59 #define IMX_UTS_TXFULL (1 << 4) 60 61 /* 62 * The base address of the uart registers. 63 * 64 * This is global so that it can be changed on the fly from the outside. For 65 * example, set imx_uart_base=physaddr and then call cninit() as the first two 66 * lines of initarm() and enjoy printf() availability through the tricky bits of 67 * startup. After initarm() switches from physical to virtual addressing, just 68 * set imx_uart_base=virtaddr and printf keeps working. 69 */ 70 uint32_t imx_uart_base = IMX_UART_BASE; 71 72 /* 73 * uart related funcs 74 */ 75 static uint32_t 76 ub_getreg(uint32_t off) 77 { 78 79 return *((volatile uint32_t *)(imx_uart_base + off)); 80 } 81 82 static void 83 ub_setreg(uint32_t off, uint32_t val) 84 { 85 86 *((volatile uint32_t *)(imx_uart_base + off)) = val; 87 } 88 89 static int 90 ub_tstc(void) 91 { 92 93 return ((ub_getreg(IMX_USR2) & IMX_USR2_RDR) ? 1 : 0); 94 } 95 96 static int 97 ub_getc(void) 98 { 99 100 while (!ub_tstc()); 101 __asm __volatile("nop"); 102 103 return (ub_getreg(IMX_RXD) & 0xff); 104 } 105 106 static void 107 ub_putc(unsigned char c) 108 { 109 110 if (c == '\n') 111 ub_putc('\r'); 112 113 while (ub_getreg(IMX_UTS) & IMX_UTS_TXFULL) 114 __asm __volatile("nop"); 115 116 ub_setreg(IMX_TXD, c); 117 } 118 119 static cn_probe_t uart_cnprobe; 120 static cn_init_t uart_cninit; 121 static cn_term_t uart_cnterm; 122 static cn_getc_t uart_cngetc; 123 static cn_putc_t uart_cnputc; 124 static cn_grab_t uart_cngrab; 125 static cn_ungrab_t uart_cnungrab; 126 127 static void 128 uart_cngrab(struct consdev *cp) 129 { 130 131 } 132 133 static void 134 uart_cnungrab(struct consdev *cp) 135 { 136 137 } 138 139 static void 140 uart_cnprobe(struct consdev *cp) 141 { 142 143 sprintf(cp->cn_name, "uart"); 144 cp->cn_pri = CN_NORMAL; 145 } 146 147 static void 148 uart_cninit(struct consdev *cp) 149 { 150 151 /* Init fifo trigger levels to 32 bytes, refclock div to 2. */ 152 ub_setreg(IMX_UFCR, 0x00004210); 153 } 154 155 static void 156 uart_cnputc(struct consdev *cp, int c) 157 { 158 159 ub_putc(c); 160 } 161 162 static int 163 uart_cngetc(struct consdev * cp) 164 { 165 166 return ub_getc(); 167 } 168 169 static void 170 uart_cnterm(struct consdev * cp) 171 { 172 173 } 174 175 CONSOLE_DRIVER(uart); 176