1 /* 2 * Copyright (c) 2003, 2004 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 33 #include <machine/bus.h> 34 #include <machine/bus_private.h> 35 36 #include <dev/ofw/openfirm.h> 37 #include <machine/ofw_machdep.h> 38 39 #include <dev/uart/uart.h> 40 #include <dev/uart/uart_cpu.h> 41 42 bus_space_tag_t uart_bus_space_io; 43 bus_space_tag_t uart_bus_space_mem; 44 45 static struct bus_space_tag bst_store[3]; 46 47 static int 48 uart_cpu_channel(char *dev) 49 { 50 char alias[64]; 51 phandle_t aliases; 52 int len; 53 54 strcpy(alias, dev); 55 if ((aliases = OF_finddevice("/aliases")) != -1) 56 OF_getprop(aliases, dev, alias, sizeof(alias)); 57 len = strlen(alias); 58 if (len < 2 || alias[len - 2] != ':' || alias[len - 1] < 'a' || 59 alias[len - 1] > 'b') 60 return (0); 61 return (alias[len - 1] - 'a' + 1); 62 } 63 64 int 65 uart_cpu_eqres(struct uart_bas *b1, struct uart_bas *b2) 66 { 67 68 return ((b1->bsh == b2->bsh) ? 1 : 0); 69 } 70 71 /* 72 * Get the address of the UART that is selected as the console, if the 73 * console is an UART of course. Note that we enforce that both stdin and 74 * stdout are selected. 75 * Note that the currently active console (i.e. /chosen/stdout and 76 * /chosen/stdin) may not be the same as the device selected in the 77 * environment (ie /options/output-device and /options/input-device) because 78 * keyboard and screen were selected but the keyboard was unplugged or the 79 * user has changed the environment. In the latter case I would assume that 80 * the user expects that FreeBSD uses the new console setting. 81 * For weirder configurations, use ofw_console(4). 82 */ 83 static phandle_t 84 uart_cpu_getdev_console(phandle_t options, char *dev, size_t devsz) 85 { 86 char buf[32]; 87 ihandle_t stdin, stdout; 88 phandle_t chosen, input; 89 90 if (OF_getprop(options, "input-device", dev, devsz) == -1) 91 return (-1); 92 if ((input = OF_finddevice(dev)) == -1) 93 return (-1); 94 if (OF_getprop(options, "output-device", buf, sizeof(buf)) == -1) 95 return (-1); 96 if (!strcmp(dev, "keyboard") && !strcmp(buf, "screen")) { 97 if ((chosen = OF_finddevice("/chosen")) == -1) 98 return (-1); 99 if (OF_getprop(chosen, "stdin", &stdin, sizeof(stdin)) == -1) 100 return (-1); 101 if ((input = OF_instance_to_package(stdin)) == -1) 102 return (-1); 103 if (OF_getprop(chosen, "stdout", &stdout, sizeof(stdout)) == -1) 104 return (-1); 105 if (OF_instance_to_package(stdout) != input) 106 return (-1); 107 snprintf(dev, devsz, "ttya"); 108 } else if (OF_finddevice(buf) != input) 109 return (-1); 110 if (OF_getprop(input, "device_type", buf, sizeof(buf)) == -1) 111 return (-1); 112 if (strcmp(buf, "serial") != 0) 113 return (-1); 114 return (input); 115 } 116 117 /* 118 * Get the address of the UART that's selected as the debug port. Since 119 * there's no place for this in the OF, we use the kernel environment 120 * variable "hw.uart.dbgport". Note however that the variable is not a 121 * list of attributes. It's single device name or alias, as known by 122 * the OF. 123 */ 124 static phandle_t 125 uart_cpu_getdev_dbgport(phandle_t options, char *dev, size_t devsz) 126 { 127 char buf[32]; 128 phandle_t input; 129 130 if (!getenv_string("hw.uart.dbgport", dev, devsz)) 131 return (-1); 132 if ((input = OF_finddevice(dev)) == -1) 133 return (-1); 134 if (OF_getprop(input, "device_type", buf, sizeof(buf)) == -1) 135 return (-1); 136 if (strcmp(buf, "serial") != 0) 137 return (-1); 138 return (input); 139 } 140 141 static phandle_t 142 uart_cpu_getdev_keyboard(phandle_t root, char *dev, size_t devsz) 143 { 144 char buf[32]; 145 phandle_t child, node; 146 147 child = OF_child(root); 148 while (child != 0 && child != -1) { 149 if (OF_getprop(child, "device_type", buf, sizeof(buf)) != -1 && 150 !strcmp(buf, "serial") && 151 OF_getprop(child, "keyboard", buf, sizeof(buf)) != -1) { 152 OF_getprop(child, "name", dev, devsz); 153 return (child); 154 } 155 if ((node = uart_cpu_getdev_keyboard(child, dev, devsz)) != -1) 156 return (node); 157 child = OF_peer(child); 158 } 159 return (-1); 160 } 161 162 int 163 uart_cpu_getdev(int devtype, struct uart_devinfo *di) 164 { 165 char buf[32], dev[32], compat[32]; 166 phandle_t input, options; 167 bus_addr_t addr; 168 int baud, bits, error, space, stop; 169 char flag, par; 170 171 if ((options = OF_finddevice("/options")) == -1) 172 return (ENXIO); 173 switch (devtype) { 174 case UART_DEV_CONSOLE: 175 input = uart_cpu_getdev_console(options, dev, sizeof(dev)); 176 break; 177 case UART_DEV_DBGPORT: 178 input = uart_cpu_getdev_dbgport(options, dev, sizeof(dev)); 179 break; 180 case UART_DEV_KEYBOARD: 181 input = uart_cpu_getdev_keyboard(OF_peer(0), dev, sizeof(dev)); 182 break; 183 default: 184 input = -1; 185 break; 186 } 187 if (input == -1) 188 return (ENXIO); 189 error = OF_decode_addr(input, &space, &addr); 190 if (error) 191 return (error); 192 193 /* Get the device class. */ 194 if (OF_getprop(input, "name", buf, sizeof(buf)) == -1) 195 return (ENXIO); 196 if (OF_getprop(input, "compatible", compat, sizeof(compat)) == -1) 197 compat[0] = '\0'; 198 di->bas.regshft = 0; 199 di->bas.rclk = 0; 200 if (!strcmp(buf, "se")) { 201 di->ops = uart_sab82532_ops; 202 di->bas.chan = uart_cpu_channel(dev); 203 addr += 64 * (di->bas.chan - 1); 204 } else if (!strcmp(buf, "zs")) { 205 di->ops = uart_z8530_ops; 206 di->bas.chan = uart_cpu_channel(dev); 207 di->bas.regshft = 1; 208 addr += 4 - 4 * (di->bas.chan - 1); 209 } else if (!strcmp(buf, "su") || !strcmp(buf, "su_pnp") || 210 !strcmp(compat, "su") || !strcmp(compat, "su16550")) { 211 di->ops = uart_ns8250_ops; 212 di->bas.chan = 0; 213 } else 214 return (ENXIO); 215 216 /* Fill in the device info. */ 217 di->bas.bst = &bst_store[devtype]; 218 di->bas.bsh = sparc64_fake_bustag(space, addr, di->bas.bst); 219 220 /* Get the line settings. */ 221 if (devtype == UART_DEV_KEYBOARD) 222 di->baudrate = 1200; 223 else 224 di->baudrate = 9600; 225 di->databits = 8; 226 di->stopbits = 1; 227 di->parity = UART_PARITY_NONE; 228 snprintf(buf, sizeof(buf), "%s-mode", dev); 229 if (OF_getprop(options, buf, buf, sizeof(buf)) == -1) 230 return (0); 231 if (sscanf(buf, "%d,%d,%c,%d,%c", &baud, &bits, &par, &stop, &flag) 232 != 5) 233 return (0); 234 di->baudrate = baud; 235 di->databits = bits; 236 di->stopbits = stop; 237 di->parity = (par == 'n') ? UART_PARITY_NONE : 238 (par == 'o') ? UART_PARITY_ODD : UART_PARITY_EVEN; 239 return (0); 240 } 241