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. For weird configurations, use ofw_console(4). 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 * the user may have changed the environment. In that case I would assume 79 * that the user expects that FreeBSD uses the new console setting. There's 80 * no choice, really. 81 */ 82 static phandle_t 83 uart_cpu_getdev_console(phandle_t options, char *dev, size_t devsz) 84 { 85 char buf[32]; 86 phandle_t input; 87 88 if (OF_getprop(options, "input-device", dev, devsz) == -1) 89 return (-1); 90 if ((input = OF_finddevice(dev)) == -1) 91 return (-1); 92 if (OF_getprop(input, "device_type", buf, sizeof(buf)) == -1) 93 return (-1); 94 if (strcmp(buf, "serial") != 0) 95 return (-1); 96 if (OF_getprop(options, "output-device", buf, sizeof(buf)) == -1) 97 return (-1); 98 if (OF_finddevice(buf) != input) 99 return (-1); 100 return (input); 101 } 102 103 /* 104 * Get the address of the UART that's selected as the debug port. Since 105 * there's no place for this in the OF, we use the kernel environment 106 * variable "hw.uart.dbgport". Note however that the variable is not a 107 * list of attributes. It's single device name or alias, as known by 108 * the OF. 109 */ 110 static phandle_t 111 uart_cpu_getdev_dbgport(phandle_t options, char *dev, size_t devsz) 112 { 113 char buf[32]; 114 phandle_t input; 115 116 if (!getenv_string("hw.uart.dbgport", dev, devsz)) 117 return (-1); 118 if ((input = OF_finddevice(dev)) == -1) 119 return (-1); 120 if (OF_getprop(input, "device_type", buf, sizeof(buf)) == -1) 121 return (-1); 122 if (strcmp(buf, "serial") != 0) 123 return (-1); 124 return (input); 125 } 126 127 static phandle_t 128 uart_cpu_getdev_keyboard(phandle_t root, char *dev, size_t devsz) 129 { 130 char buf[32]; 131 phandle_t child, node; 132 133 child = OF_child(root); 134 while (child != 0 && child != -1) { 135 if (OF_getprop(child, "device_type", buf, sizeof(buf)) != -1 && 136 !strcmp(buf, "serial") && 137 OF_getprop(child, "keyboard", buf, sizeof(buf)) != -1) { 138 OF_getprop(child, "name", dev, devsz); 139 return (child); 140 } 141 if ((node = uart_cpu_getdev_keyboard(child, dev, devsz)) != -1) 142 return (node); 143 child = OF_peer(child); 144 } 145 return (-1); 146 } 147 148 int 149 uart_cpu_getdev(int devtype, struct uart_devinfo *di) 150 { 151 char buf[32], dev[32], compat[32]; 152 phandle_t input, options; 153 bus_addr_t addr; 154 int baud, bits, error, space, stop; 155 char flag, par; 156 157 if ((options = OF_finddevice("/options")) == -1) 158 return (ENXIO); 159 switch (devtype) { 160 case UART_DEV_CONSOLE: 161 input = uart_cpu_getdev_console(options, dev, sizeof(dev)); 162 break; 163 case UART_DEV_DBGPORT: 164 input = uart_cpu_getdev_dbgport(options, dev, sizeof(dev)); 165 break; 166 case UART_DEV_KEYBOARD: 167 input = uart_cpu_getdev_keyboard(OF_peer(0), dev, sizeof(dev)); 168 break; 169 default: 170 input = -1; 171 break; 172 } 173 if (input == -1) 174 return (ENXIO); 175 error = OF_decode_addr(input, &space, &addr); 176 if (error) 177 return (error); 178 179 /* Get the device class. */ 180 if (OF_getprop(input, "name", buf, sizeof(buf)) == -1) 181 return (ENXIO); 182 if (OF_getprop(input, "compatible", compat, sizeof(compat)) == -1) 183 compat[0] = '\0'; 184 di->bas.regshft = 0; 185 di->bas.rclk = 0; 186 if (!strcmp(buf, "se")) { 187 di->ops = uart_sab82532_ops; 188 di->bas.chan = uart_cpu_channel(dev); 189 addr += 64 * (di->bas.chan - 1); 190 } else if (!strcmp(buf, "zs")) { 191 di->ops = uart_z8530_ops; 192 di->bas.chan = uart_cpu_channel(dev); 193 di->bas.regshft = 1; 194 addr += 4 - 4 * (di->bas.chan - 1); 195 } else if (!strcmp(buf, "su") || !strcmp(buf, "su_pnp") || 196 !strcmp(compat, "su") || !strcmp(compat, "su16550")) { 197 di->ops = uart_ns8250_ops; 198 di->bas.chan = 0; 199 } else 200 return (ENXIO); 201 202 /* Fill in the device info. */ 203 di->bas.bst = &bst_store[devtype]; 204 di->bas.bsh = sparc64_fake_bustag(space, addr, di->bas.bst); 205 206 /* Get the line settings. */ 207 if (devtype == UART_DEV_KEYBOARD) 208 di->baudrate = 1200; 209 else 210 di->baudrate = 9600; 211 di->databits = 8; 212 di->stopbits = 1; 213 di->parity = UART_PARITY_NONE; 214 snprintf(buf, sizeof(buf), "%s-mode", dev); 215 if (OF_getprop(options, buf, buf, sizeof(buf)) == -1) 216 return (0); 217 if (sscanf(buf, "%d,%d,%c,%d,%c", &baud, &bits, &par, &stop, &flag) 218 != 5) 219 return (0); 220 di->baudrate = baud; 221 di->databits = bits; 222 di->stopbits = stop; 223 di->parity = (par == 'n') ? UART_PARITY_NONE : 224 (par == 'o') ? UART_PARITY_ODD : UART_PARITY_EVEN; 225 return (0); 226 } 227