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