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/openfirm.h> 39 #include <dev/uart/uart.h> 40 #include <dev/uart/uart_cpu.h> 41 42 bus_space_tag_t uart_bus_space_io = &bs_le_tag; 43 bus_space_tag_t uart_bus_space_mem = &bs_le_tag; 44 45 int 46 uart_cpu_eqres(struct uart_bas *b1, struct uart_bas *b2) 47 { 48 49 return ((pmap_kextract(b1->bsh) == pmap_kextract(b2->bsh)) ? 1 : 0); 50 } 51 52 static int 53 ofw_get_uart_console(phandle_t opts, phandle_t *result, const char *inputdev, 54 const char *outputdev) 55 { 56 char buf[64]; 57 phandle_t input; 58 59 if (OF_getprop(opts, inputdev, buf, sizeof(buf)) == -1) 60 return (ENXIO); 61 input = OF_finddevice(buf); 62 if (input == -1) 63 return (ENXIO); 64 65 if (outputdev != NULL) { 66 if (OF_getprop(opts, outputdev, buf, sizeof(buf)) == -1) 67 return (ENXIO); 68 if (OF_finddevice(buf) != input) 69 return (ENXIO); 70 } 71 72 *result = input; 73 return (0); 74 } 75 76 static int 77 ofw_get_console_phandle_path(phandle_t node, phandle_t *result, 78 const char *prop) 79 { 80 union { 81 char buf[64]; 82 phandle_t ref; 83 } field; 84 phandle_t output; 85 ssize_t size; 86 87 size = OF_getproplen(node, prop); 88 if (size == -1) 89 return (ENXIO); 90 OF_getprop(node, prop, &field, sizeof(field)); 91 92 /* This property might be either a ihandle or path. Hooray. */ 93 94 output = -1; 95 if (field.buf[size - 1] == 0) 96 output = OF_finddevice(field.buf); 97 if (output == -1 && size == 4) 98 output = OF_instance_to_package(field.ref); 99 100 if (output != -1) { 101 *result = output; 102 return (0); 103 } 104 105 return (ENXIO); 106 } 107 108 int 109 uart_cpu_getdev(int devtype, struct uart_devinfo *di) 110 { 111 char buf[64]; 112 struct uart_class *class; 113 phandle_t input, opts, chosen; 114 int error; 115 116 opts = OF_finddevice("/options"); 117 chosen = OF_finddevice("/chosen"); 118 switch (devtype) { 119 case UART_DEV_CONSOLE: 120 error = ENXIO; 121 if (chosen != -1 && error != 0) 122 error = ofw_get_uart_console(chosen, &input, 123 "stdout-path", NULL); 124 if (chosen != -1 && error != 0) 125 error = ofw_get_uart_console(chosen, &input, 126 "linux,stdout-path", NULL); 127 if (chosen != -1 && error != 0) 128 error = ofw_get_console_phandle_path(chosen, &input, 129 "stdout"); 130 if (chosen != -1 && error != 0) 131 error = ofw_get_uart_console(chosen, &input, 132 "stdin-path", NULL); 133 if (chosen != -1 && error != 0) 134 error = ofw_get_console_phandle_path(chosen, &input, 135 "stdin"); 136 if (opts != -1 && error != 0) 137 error = ofw_get_uart_console(opts, &input, 138 "input-device", "output-device"); 139 if (opts != -1 && error != 0) 140 error = ofw_get_uart_console(opts, &input, 141 "input-device-1", "output-device-1"); 142 if (error != 0) { 143 input = OF_finddevice("serial0"); /* Last ditch */ 144 if (input == -1) 145 error = (ENXIO); 146 } 147 148 if (error != 0) 149 return (error); 150 break; 151 case UART_DEV_DBGPORT: 152 if (!getenv_string("hw.uart.dbgport", buf, sizeof(buf))) 153 return (ENXIO); 154 input = OF_finddevice(buf); 155 if (input == -1) 156 return (ENXIO); 157 break; 158 default: 159 return (EINVAL); 160 } 161 162 if (OF_getprop(input, "device_type", buf, sizeof(buf)) == -1) 163 return (ENXIO); 164 if (strcmp(buf, "serial") != 0) 165 return (ENXIO); 166 if (OF_getprop(input, "compatible", buf, sizeof(buf)) == -1) 167 return (ENXIO); 168 169 if (strncmp(buf, "chrp,es", 7) == 0) { 170 class = &uart_z8530_class; 171 di->bas.regshft = 4; 172 di->bas.chan = 1; 173 } else if (strcmp(buf,"ns16550") == 0 || strcmp(buf,"ns8250") == 0) { 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); 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