1 /*- 2 * Copyright (c) 2006 Marcel Moolenaar 3 * All rights reserved. 4 * 5 * Redistribution and use in source and binary forms, with or without 6 * modification, are permitted provided that the following conditions 7 * are met: 8 * 9 * 1. Redistributions of source code must retain the above copyright 10 * notice, this list of conditions and the following disclaimer. 11 * 2. Redistributions in binary form must reproduce the above copyright 12 * notice, this list of conditions and the following disclaimer in the 13 * documentation and/or other materials provided with the distribution. 14 * 15 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR 16 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES 17 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 18 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, 19 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT 20 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 21 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 22 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 23 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF 24 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 25 */ 26 27 #include <sys/cdefs.h> 28 __FBSDID("$FreeBSD$"); 29 30 #include <sys/param.h> 31 #include <sys/systm.h> 32 #include <vm/vm.h> 33 #include <vm/pmap.h> 34 35 #include <machine/bus.h> 36 #include <machine/ofw_machdep.h> 37 38 #include <dev/ofw/ofw_bus_subr.h> 39 #include <dev/ofw/openfirm.h> 40 #include <dev/uart/uart.h> 41 #include <dev/uart/uart_cpu.h> 42 43 bus_space_tag_t uart_bus_space_io = &bs_le_tag; 44 bus_space_tag_t uart_bus_space_mem = &bs_le_tag; 45 46 int 47 uart_cpu_eqres(struct uart_bas *b1, struct uart_bas *b2) 48 { 49 50 return ((pmap_kextract(b1->bsh) == pmap_kextract(b2->bsh)) ? 1 : 0); 51 } 52 53 static int 54 ofw_get_uart_console(phandle_t opts, phandle_t *result, const char *inputdev, 55 const char *outputdev) 56 { 57 char buf[64]; 58 phandle_t input; 59 60 if (OF_getprop(opts, inputdev, buf, sizeof(buf)) == -1) 61 return (ENXIO); 62 input = OF_finddevice(buf); 63 if (input == -1) 64 return (ENXIO); 65 66 if (outputdev != NULL) { 67 if (OF_getprop(opts, outputdev, buf, sizeof(buf)) == -1) 68 return (ENXIO); 69 if (OF_finddevice(buf) != input) 70 return (ENXIO); 71 } 72 73 *result = input; 74 return (0); 75 } 76 77 static int 78 ofw_get_console_phandle_path(phandle_t node, phandle_t *result, 79 const char *prop) 80 { 81 union { 82 char buf[64]; 83 phandle_t ref; 84 } field; 85 phandle_t output; 86 ssize_t size; 87 88 size = OF_getproplen(node, prop); 89 if (size == -1) 90 return (ENXIO); 91 OF_getprop(node, prop, &field, sizeof(field)); 92 93 /* This property might be either a ihandle or path. Hooray. */ 94 95 output = -1; 96 if (field.buf[size - 1] == 0) 97 output = OF_finddevice(field.buf); 98 if (output == -1 && size == 4) 99 output = OF_instance_to_package(field.ref); 100 101 if (output != -1) { 102 *result = output; 103 return (0); 104 } 105 106 return (ENXIO); 107 } 108 109 int 110 uart_cpu_getdev(int devtype, struct uart_devinfo *di) 111 { 112 char buf[64]; 113 struct uart_class *class; 114 phandle_t input, opts, chosen; 115 int error; 116 117 opts = OF_finddevice("/options"); 118 chosen = OF_finddevice("/chosen"); 119 switch (devtype) { 120 case UART_DEV_CONSOLE: 121 error = ENXIO; 122 if (chosen != -1 && error != 0) 123 error = ofw_get_uart_console(chosen, &input, 124 "stdout-path", NULL); 125 if (chosen != -1 && error != 0) 126 error = ofw_get_uart_console(chosen, &input, 127 "linux,stdout-path", NULL); 128 if (chosen != -1 && error != 0) 129 error = ofw_get_console_phandle_path(chosen, &input, 130 "stdout"); 131 if (chosen != -1 && error != 0) 132 error = ofw_get_uart_console(chosen, &input, 133 "stdin-path", NULL); 134 if (chosen != -1 && error != 0) 135 error = ofw_get_console_phandle_path(chosen, &input, 136 "stdin"); 137 if (opts != -1 && error != 0) 138 error = ofw_get_uart_console(opts, &input, 139 "input-device", "output-device"); 140 if (opts != -1 && error != 0) 141 error = ofw_get_uart_console(opts, &input, 142 "input-device-1", "output-device-1"); 143 if (error != 0) { 144 input = OF_finddevice("serial0"); /* Last ditch */ 145 if (input == -1) 146 error = (ENXIO); 147 } 148 149 if (error != 0) 150 return (error); 151 break; 152 case UART_DEV_DBGPORT: 153 if (!getenv_string("hw.uart.dbgport", buf, sizeof(buf))) 154 return (ENXIO); 155 input = OF_finddevice(buf); 156 if (input == -1) 157 return (ENXIO); 158 break; 159 default: 160 return (EINVAL); 161 } 162 163 if (OF_getprop(input, "device_type", buf, sizeof(buf)) == -1) 164 return (ENXIO); 165 if (strcmp(buf, "serial") != 0) 166 return (ENXIO); 167 168 if (ofw_bus_node_is_compatible(input, "chrp,es")) { 169 class = &uart_z8530_class; 170 di->bas.regshft = 4; 171 di->bas.chan = 1; 172 } else if (ofw_bus_node_is_compatible(input,"ns16550") || 173 ofw_bus_node_is_compatible(input,"ns8250")) { 174 class = &uart_ns8250_class; 175 di->bas.regshft = 0; 176 di->bas.chan = 0; 177 } else 178 return (ENXIO); 179 180 if (class == NULL) 181 return (ENXIO); 182 183 error = OF_decode_addr(input, 0, &di->bas.bst, &di->bas.bsh, NULL); 184 if (error) 185 return (error); 186 187 di->ops = uart_getops(class); 188 189 if (OF_getprop(input, "clock-frequency", &di->bas.rclk, 190 sizeof(di->bas.rclk)) == -1) 191 di->bas.rclk = 230400; 192 if (OF_getprop(input, "current-speed", &di->baudrate, 193 sizeof(di->baudrate)) == -1) 194 di->baudrate = 0; 195 OF_getprop(input, "reg-shift", &di->bas.regshft, 196 sizeof(di->bas.regshft)); 197 198 di->databits = 8; 199 di->stopbits = 1; 200 di->parity = UART_PARITY_NONE; 201 return (0); 202 } 203 204