1 /*- 2 * SPDX-License-Identifier: BSD-2-Clause-FreeBSD 3 * 4 * Copyright (c) 2006 Marcel Moolenaar 5 * All rights reserved. 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 * 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 ``AS IS'' AND ANY EXPRESS OR 18 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES 19 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 20 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, 21 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT 22 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 23 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 24 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 25 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF 26 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 27 */ 28 29 #include <sys/cdefs.h> 30 __FBSDID("$FreeBSD$"); 31 32 #include <sys/param.h> 33 #include <sys/systm.h> 34 #include <vm/vm.h> 35 #include <vm/pmap.h> 36 37 #include <machine/bus.h> 38 #include <machine/ofw_machdep.h> 39 40 #include <dev/ofw/ofw_bus_subr.h> 41 #include <dev/ofw/openfirm.h> 42 #include <dev/uart/uart.h> 43 #include <dev/uart/uart_cpu.h> 44 45 bus_space_tag_t uart_bus_space_io = &bs_le_tag; 46 bus_space_tag_t uart_bus_space_mem = &bs_le_tag; 47 48 int 49 uart_cpu_eqres(struct uart_bas *b1, struct uart_bas *b2) 50 { 51 52 return ((pmap_kextract(b1->bsh) == pmap_kextract(b2->bsh)) ? 1 : 0); 53 } 54 55 static int 56 ofw_get_uart_console(phandle_t opts, phandle_t *result, const char *inputdev, 57 const char *outputdev) 58 { 59 char buf[64]; 60 phandle_t input; 61 62 if (OF_getprop(opts, inputdev, buf, sizeof(buf)) == -1) 63 return (ENXIO); 64 input = OF_finddevice(buf); 65 if (input == -1) 66 return (ENXIO); 67 68 if (outputdev != NULL) { 69 if (OF_getprop(opts, outputdev, buf, sizeof(buf)) == -1) 70 return (ENXIO); 71 if (OF_finddevice(buf) != input) 72 return (ENXIO); 73 } 74 75 *result = input; 76 return (0); 77 } 78 79 static int 80 ofw_get_console_phandle_path(phandle_t node, phandle_t *result, 81 const char *prop) 82 { 83 union { 84 char buf[64]; 85 phandle_t ref; 86 } field; 87 phandle_t output; 88 ssize_t size; 89 90 size = OF_getproplen(node, prop); 91 if (size == -1) 92 return (ENXIO); 93 OF_getprop(node, prop, &field, sizeof(field)); 94 95 /* This property might be either a ihandle or path. Hooray. */ 96 97 output = -1; 98 if (field.buf[size - 1] == 0) 99 output = OF_finddevice(field.buf); 100 if (output == -1 && size == 4) 101 output = OF_instance_to_package(field.ref); 102 103 if (output != -1) { 104 *result = output; 105 return (0); 106 } 107 108 return (ENXIO); 109 } 110 111 int 112 uart_cpu_getdev(int devtype, struct uart_devinfo *di) 113 { 114 char buf[64]; 115 struct uart_class *class; 116 phandle_t input, opts, chosen; 117 int error; 118 119 opts = OF_finddevice("/options"); 120 chosen = OF_finddevice("/chosen"); 121 switch (devtype) { 122 case UART_DEV_CONSOLE: 123 error = ENXIO; 124 if (chosen != -1 && error != 0) 125 error = ofw_get_uart_console(chosen, &input, 126 "stdout-path", NULL); 127 if (chosen != -1 && error != 0) 128 error = ofw_get_uart_console(chosen, &input, 129 "linux,stdout-path", NULL); 130 if (chosen != -1 && error != 0) 131 error = ofw_get_console_phandle_path(chosen, &input, 132 "stdout"); 133 if (chosen != -1 && error != 0) 134 error = ofw_get_uart_console(chosen, &input, 135 "stdin-path", NULL); 136 if (chosen != -1 && error != 0) 137 error = ofw_get_console_phandle_path(chosen, &input, 138 "stdin"); 139 if (opts != -1 && error != 0) 140 error = ofw_get_uart_console(opts, &input, 141 "input-device", "output-device"); 142 if (opts != -1 && error != 0) 143 error = ofw_get_uart_console(opts, &input, 144 "input-device-1", "output-device-1"); 145 if (error != 0) { 146 input = OF_finddevice("serial0"); /* Last ditch */ 147 if (input == -1) 148 error = (ENXIO); 149 } 150 151 if (error != 0) 152 return (error); 153 break; 154 case UART_DEV_DBGPORT: 155 if (!getenv_string("hw.uart.dbgport", buf, sizeof(buf))) 156 return (ENXIO); 157 input = OF_finddevice(buf); 158 if (input == -1) 159 return (ENXIO); 160 break; 161 default: 162 return (EINVAL); 163 } 164 165 if (OF_getprop(input, "device_type", buf, sizeof(buf)) == -1) 166 return (ENXIO); 167 if (strcmp(buf, "serial") != 0) 168 return (ENXIO); 169 170 if (ofw_bus_node_is_compatible(input, "chrp,es")) { 171 class = &uart_z8530_class; 172 di->bas.regshft = 4; 173 di->bas.chan = 1; 174 } else if (ofw_bus_node_is_compatible(input,"ns16550") || 175 ofw_bus_node_is_compatible(input,"ns8250")) { 176 class = &uart_ns8250_class; 177 di->bas.regshft = 0; 178 di->bas.chan = 0; 179 } else 180 return (ENXIO); 181 182 if (class == NULL) 183 return (ENXIO); 184 185 error = OF_decode_addr(input, 0, &di->bas.bst, &di->bas.bsh, NULL); 186 if (error) 187 return (error); 188 189 di->ops = uart_getops(class); 190 191 if (OF_getprop(input, "clock-frequency", &di->bas.rclk, 192 sizeof(di->bas.rclk)) == -1) 193 di->bas.rclk = 230400; 194 if (OF_getprop(input, "current-speed", &di->baudrate, 195 sizeof(di->baudrate)) == -1) 196 di->baudrate = 0; 197 OF_getprop(input, "reg-shift", &di->bas.regshft, 198 sizeof(di->bas.regshft)); 199 200 di->databits = 8; 201 di->stopbits = 1; 202 di->parity = UART_PARITY_NONE; 203 return (0); 204 } 205