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 #ifndef __aarch64__ 46 #include <machine/fdt.h> 47 #endif 48 49 #include <dev/fdt/fdt_common.h> 50 #include <dev/ofw/ofw_bus.h> 51 #include <dev/ofw/ofw_bus_subr.h> 52 #include <dev/uart/uart.h> 53 #include <dev/uart/uart_bus.h> 54 #include <dev/uart/uart_cpu.h> 55 #include <dev/uart/uart_cpu_fdt.h> 56 57 /* 58 * UART console routines. 59 */ 60 bus_space_tag_t uart_bus_space_io; 61 bus_space_tag_t uart_bus_space_mem; 62 63 int 64 uart_cpu_eqres(struct uart_bas *b1, struct uart_bas *b2) 65 { 66 67 if (b1->bst != b2->bst) 68 return (0); 69 if (pmap_kextract(b1->bsh) == 0) 70 return (0); 71 if (pmap_kextract(b2->bsh) == 0) 72 return (0); 73 return ((pmap_kextract(b1->bsh) == pmap_kextract(b2->bsh)) ? 1 : 0); 74 } 75 76 static int 77 phandle_chosen_propdev(phandle_t chosen, const char *name, phandle_t *node) 78 { 79 char buf[64]; 80 81 if (OF_getprop(chosen, name, buf, sizeof(buf)) <= 0) 82 return (ENXIO); 83 if ((*node = OF_finddevice(buf)) == -1) 84 return (ENXIO); 85 86 return (0); 87 } 88 89 static const struct ofw_compat_data * 90 uart_fdt_find_compatible(phandle_t node, const struct ofw_compat_data *cd) 91 { 92 const struct ofw_compat_data *ocd; 93 94 for (ocd = cd; ocd->ocd_str != NULL; ocd++) { 95 if (fdt_is_compatible(node, ocd->ocd_str)) 96 return (ocd); 97 } 98 return (NULL); 99 } 100 101 static uintptr_t 102 uart_fdt_find_by_node(phandle_t node, int class_list) 103 { 104 struct ofw_compat_data **cd; 105 const struct ofw_compat_data *ocd; 106 107 if (class_list) { 108 SET_FOREACH(cd, uart_fdt_class_set) { 109 ocd = uart_fdt_find_compatible(node, *cd); 110 if ((ocd != NULL) && (ocd->ocd_data != 0)) 111 return (ocd->ocd_data); 112 } 113 } else { 114 SET_FOREACH(cd, uart_fdt_class_and_device_set) { 115 ocd = uart_fdt_find_compatible(node, *cd); 116 if ((ocd != NULL) && (ocd->ocd_data != 0)) 117 return (ocd->ocd_data); 118 } 119 } 120 return (0); 121 } 122 123 int 124 uart_cpu_getdev(int devtype, struct uart_devinfo *di) 125 { 126 const char *propnames[] = {"stdout-path", "linux,stdout-path", "stdout", 127 "stdin-path", "stdin", NULL}; 128 const char **name; 129 struct uart_class *class; 130 phandle_t node, chosen; 131 pcell_t shift, br, rclk; 132 char *cp; 133 int err; 134 135 /* Allow overriding the FDT using the environment. */ 136 class = &uart_ns8250_class; 137 err = uart_getenv(devtype, di, class); 138 if (!err) 139 return (0); 140 141 if (devtype != UART_DEV_CONSOLE) 142 return (ENXIO); 143 144 /* Has the user forced a specific device node? */ 145 cp = kern_getenv("hw.fdt.console"); 146 if (cp == NULL) { 147 /* 148 * Retrieve /chosen/std{in,out}. 149 */ 150 node = -1; 151 if ((chosen = OF_finddevice("/chosen")) != -1) { 152 for (name = propnames; *name != NULL; name++) { 153 if (phandle_chosen_propdev(chosen, *name, 154 &node) == 0) 155 break; 156 } 157 } 158 if (chosen == -1 || *name == NULL) 159 node = OF_finddevice("serial0"); /* Last ditch */ 160 } else { 161 node = OF_finddevice(cp); 162 } 163 164 if (node == -1) /* Can't find anything */ 165 return (ENXIO); 166 167 /* 168 * Check old style of UART definition first. Unfortunately, the common 169 * FDT processing is not possible if we have clock, power domains and 170 * pinmux stuff. 171 */ 172 class = (struct uart_class *)uart_fdt_find_by_node(node, 0); 173 if (class != NULL) { 174 if ((err = uart_fdt_get_clock(node, &rclk)) != 0) 175 return (err); 176 } else { 177 /* Check class only linker set */ 178 class = 179 (struct uart_class *)uart_fdt_find_by_node(node, 1); 180 if (class == NULL) 181 return (ENXIO); 182 rclk = 0; 183 } 184 185 /* 186 * Retrieve serial attributes. 187 */ 188 if (uart_fdt_get_shift(node, &shift) != 0) 189 shift = uart_getregshift(class); 190 191 if (OF_getencprop(node, "current-speed", &br, sizeof(br)) <= 0) 192 br = 0; 193 194 /* 195 * Finalize configuration. 196 */ 197 di->bas.chan = 0; 198 di->bas.regshft = (u_int)shift; 199 di->baudrate = br; 200 di->bas.rclk = (u_int)rclk; 201 di->ops = uart_getops(class); 202 di->databits = 8; 203 di->stopbits = 1; 204 di->parity = UART_PARITY_NONE; 205 206 err = OF_decode_addr(node, 0, &di->bas.bst, &di->bas.bsh, NULL); 207 uart_bus_space_mem = di->bas.bst; 208 uart_bus_space_io = NULL; 209 210 return (err); 211 } 212