1 /*- 2 * Copyright (c) 2009-2010 The FreeBSD Foundation 3 * All rights reserved. 4 * 5 * This software was developed by Semihalf under sponsorship from 6 * the FreeBSD Foundation. 7 * 8 * Redistribution and use in source and binary forms, with or without 9 * modification, are permitted provided that the following conditions 10 * are met: 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 AND CONTRIBUTORS ``AS IS'' AND 18 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 19 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 20 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 21 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 22 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 23 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 24 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 25 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 26 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 27 * SUCH DAMAGE. 28 */ 29 30 #include <sys/cdefs.h> 31 __FBSDID("$FreeBSD$"); 32 33 #include "opt_platform.h" 34 35 #include <sys/param.h> 36 #include <sys/bus.h> 37 #include <sys/kernel.h> 38 #include <sys/module.h> 39 #include <sys/systm.h> 40 41 #include <vm/vm.h> 42 #include <vm/pmap.h> 43 44 #include <machine/bus.h> 45 46 #include <dev/fdt/fdt_common.h> 47 #include <dev/ofw/ofw_bus.h> 48 #include <dev/ofw/ofw_bus_subr.h> 49 #include <dev/uart/uart.h> 50 #include <dev/uart/uart_bus.h> 51 #include <dev/uart/uart_cpu.h> 52 #include <dev/uart/uart_cpu_fdt.h> 53 54 /* 55 * UART console routines. 56 */ 57 bus_space_tag_t uart_bus_space_io; 58 bus_space_tag_t uart_bus_space_mem; 59 60 int 61 uart_cpu_eqres(struct uart_bas *b1, struct uart_bas *b2) 62 { 63 64 if (b1->bst != b2->bst) 65 return (0); 66 if (pmap_kextract(b1->bsh) == 0) 67 return (0); 68 if (pmap_kextract(b2->bsh) == 0) 69 return (0); 70 return ((pmap_kextract(b1->bsh) == pmap_kextract(b2->bsh)) ? 1 : 0); 71 } 72 73 static int 74 phandle_chosen_propdev(phandle_t chosen, const char *name, phandle_t *node) 75 { 76 char buf[64]; 77 78 if (OF_getprop(chosen, name, buf, sizeof(buf)) <= 0) 79 return (ENXIO); 80 if ((*node = OF_finddevice(buf)) == -1) 81 return (ENXIO); 82 83 return (0); 84 } 85 86 static const struct ofw_compat_data * 87 uart_fdt_find_compatible(phandle_t node, const struct ofw_compat_data *cd) 88 { 89 const struct ofw_compat_data *ocd; 90 91 for (ocd = cd; ocd->ocd_str != NULL; ocd++) { 92 if (fdt_is_compatible(node, ocd->ocd_str)) 93 return (ocd); 94 } 95 return (NULL); 96 } 97 98 static uintptr_t 99 uart_fdt_find_by_node(phandle_t node, int class_list) 100 { 101 struct ofw_compat_data **cd; 102 const struct ofw_compat_data *ocd; 103 104 if (class_list) { 105 SET_FOREACH(cd, uart_fdt_class_set) { 106 ocd = uart_fdt_find_compatible(node, *cd); 107 if ((ocd != NULL) && (ocd->ocd_data != 0)) 108 return (ocd->ocd_data); 109 } 110 } else { 111 SET_FOREACH(cd, uart_fdt_class_and_device_set) { 112 ocd = uart_fdt_find_compatible(node, *cd); 113 if ((ocd != NULL) && (ocd->ocd_data != 0)) 114 return (ocd->ocd_data); 115 } 116 } 117 return (0); 118 } 119 120 int 121 uart_cpu_getdev(int devtype, struct uart_devinfo *di) 122 { 123 const char *propnames[] = {"stdout-path", "linux,stdout-path", "stdout", 124 "stdin-path", "stdin", NULL}; 125 const char **name; 126 struct uart_class *class; 127 phandle_t node, chosen; 128 pcell_t shift, br, rclk; 129 char *cp; 130 int err; 131 132 /* Allow overriding the FDT using the environment. */ 133 class = &uart_ns8250_class; 134 err = uart_getenv(devtype, di, class); 135 if (!err) 136 return (0); 137 138 if (devtype != UART_DEV_CONSOLE) 139 return (ENXIO); 140 141 /* Has the user forced a specific device node? */ 142 cp = kern_getenv("hw.fdt.console"); 143 if (cp == NULL) { 144 /* 145 * Retrieve /chosen/std{in,out}. 146 */ 147 node = -1; 148 if ((chosen = OF_finddevice("/chosen")) != -1) { 149 for (name = propnames; *name != NULL; name++) { 150 if (phandle_chosen_propdev(chosen, *name, 151 &node) == 0) 152 break; 153 } 154 } 155 if (chosen == -1 || *name == NULL) 156 node = OF_finddevice("serial0"); /* Last ditch */ 157 } else { 158 node = OF_finddevice(cp); 159 } 160 161 if (node == -1) /* Can't find anything */ 162 return (ENXIO); 163 164 /* 165 * Check old style of UART definition first. Unfortunately, the common 166 * FDT processing is not possible if we have clock, power domains and 167 * pinmux stuff. 168 */ 169 class = (struct uart_class *)uart_fdt_find_by_node(node, 0); 170 if (class != NULL) { 171 if ((err = uart_fdt_get_clock(node, &rclk)) != 0) 172 return (err); 173 } else { 174 /* Check class only linker set */ 175 class = 176 (struct uart_class *)uart_fdt_find_by_node(node, 1); 177 if (class == NULL) 178 return (ENXIO); 179 rclk = 0; 180 } 181 182 /* 183 * Retrieve serial attributes. 184 */ 185 if (uart_fdt_get_shift(node, &shift) != 0) 186 shift = uart_getregshift(class); 187 188 if (OF_getencprop(node, "current-speed", &br, sizeof(br)) <= 0) 189 br = 0; 190 191 /* 192 * Finalize configuration. 193 */ 194 di->bas.chan = 0; 195 di->bas.regshft = (u_int)shift; 196 di->baudrate = br; 197 di->bas.rclk = (u_int)rclk; 198 di->ops = uart_getops(class); 199 di->databits = 8; 200 di->stopbits = 1; 201 di->parity = UART_PARITY_NONE; 202 203 err = OF_decode_addr(node, 0, &di->bas.bst, &di->bas.bsh, NULL); 204 uart_bus_space_mem = di->bas.bst; 205 uart_bus_space_io = NULL; 206 207 return (err); 208 } 209