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 #ifdef __aarch64__ 58 extern bus_space_tag_t fdtbus_bs_tag; 59 #endif 60 61 /* 62 * UART console routines. 63 */ 64 bus_space_tag_t uart_bus_space_io; 65 bus_space_tag_t uart_bus_space_mem; 66 67 int 68 uart_cpu_eqres(struct uart_bas *b1, struct uart_bas *b2) 69 { 70 71 if (b1->bst != b2->bst) 72 return (0); 73 if (pmap_kextract(b1->bsh) == 0) 74 return (0); 75 if (pmap_kextract(b2->bsh) == 0) 76 return (0); 77 return ((pmap_kextract(b1->bsh) == pmap_kextract(b2->bsh)) ? 1 : 0); 78 } 79 80 static int 81 phandle_chosen_propdev(phandle_t chosen, const char *name, phandle_t *node) 82 { 83 char buf[64]; 84 85 if (OF_getprop(chosen, name, buf, sizeof(buf)) <= 0) 86 return (ENXIO); 87 if ((*node = OF_finddevice(buf)) == -1) 88 return (ENXIO); 89 90 return (0); 91 } 92 93 static const struct ofw_compat_data * 94 uart_fdt_find_compatible(phandle_t node, const struct ofw_compat_data *cd) 95 { 96 const struct ofw_compat_data *ocd; 97 98 for (ocd = cd; ocd->ocd_str != NULL; ocd++) { 99 if (fdt_is_compatible(node, ocd->ocd_str)) 100 return (ocd); 101 } 102 return (NULL); 103 } 104 105 static uintptr_t 106 uart_fdt_find_by_node(phandle_t node, int class_list) 107 { 108 struct ofw_compat_data **cd; 109 const struct ofw_compat_data *ocd; 110 111 if (class_list) { 112 SET_FOREACH(cd, uart_fdt_class_set) { 113 ocd = uart_fdt_find_compatible(node, *cd); 114 if ((ocd != NULL) && (ocd->ocd_data != 0)) 115 return (ocd->ocd_data); 116 } 117 } else { 118 SET_FOREACH(cd, uart_fdt_class_and_device_set) { 119 ocd = uart_fdt_find_compatible(node, *cd); 120 if ((ocd != NULL) && (ocd->ocd_data != 0)) 121 return (ocd->ocd_data); 122 } 123 } 124 return (0); 125 } 126 127 int 128 uart_cpu_getdev(int devtype, struct uart_devinfo *di) 129 { 130 const char *propnames[] = {"stdout-path", "linux,stdout-path", "stdout", 131 "stdin-path", "stdin", NULL}; 132 const char **name; 133 struct uart_class *class; 134 phandle_t node, chosen; 135 pcell_t shift, br, rclk; 136 u_long start, size, pbase, psize; 137 char *cp; 138 int err; 139 140 uart_bus_space_mem = fdtbus_bs_tag; 141 uart_bus_space_io = NULL; 142 143 /* Allow overriding the FDT using the environment. */ 144 class = &uart_ns8250_class; 145 err = uart_getenv(devtype, di, class); 146 if (!err) 147 return (0); 148 149 if (devtype != UART_DEV_CONSOLE) 150 return (ENXIO); 151 152 /* Has the user forced a specific device node? */ 153 cp = kern_getenv("hw.fdt.console"); 154 if (cp == NULL) { 155 /* 156 * Retrieve /chosen/std{in,out}. 157 */ 158 node = -1; 159 if ((chosen = OF_finddevice("/chosen")) != -1) { 160 for (name = propnames; *name != NULL; name++) { 161 if (phandle_chosen_propdev(chosen, *name, 162 &node) == 0) 163 break; 164 } 165 } 166 if (chosen == -1 || *name == NULL) 167 node = OF_finddevice("serial0"); /* Last ditch */ 168 } else { 169 node = OF_finddevice(cp); 170 } 171 172 if (node == -1) /* Can't find anything */ 173 return (ENXIO); 174 175 /* 176 * Check old style of UART definition first. Unfortunately, the common 177 * FDT processing is not possible if we have clock, power domains and 178 * pinmux stuff. 179 */ 180 class = (struct uart_class *)uart_fdt_find_by_node(node, 0); 181 if (class != NULL) { 182 if ((err = uart_fdt_get_clock(node, &rclk)) != 0) 183 return (err); 184 } else { 185 /* Check class only linker set */ 186 class = 187 (struct uart_class *)uart_fdt_find_by_node(node, 1); 188 if (class == NULL) 189 return (ENXIO); 190 rclk = 0; 191 } 192 193 /* 194 * Retrieve serial attributes. 195 */ 196 if (uart_fdt_get_shift(node, &shift) != 0) 197 shift = uart_getregshift(class); 198 199 if (OF_getprop(node, "current-speed", &br, sizeof(br)) <= 0) 200 br = 0; 201 else 202 br = fdt32_to_cpu(br); 203 204 /* 205 * Finalize configuration. 206 */ 207 di->bas.chan = 0; 208 di->bas.regshft = (u_int)shift; 209 di->baudrate = br; 210 di->bas.rclk = (u_int)rclk; 211 di->ops = uart_getops(class); 212 di->databits = 8; 213 di->stopbits = 1; 214 di->parity = UART_PARITY_NONE; 215 di->bas.bst = uart_bus_space_mem; 216 217 err = fdt_regsize(node, &start, &size); 218 if (err) 219 return (ENXIO); 220 err = fdt_get_range(OF_parent(node), 0, &pbase, &psize); 221 if (err) 222 pbase = 0; 223 224 start += pbase; 225 226 return (bus_space_map(di->bas.bst, start, size, 0, &di->bas.bsh)); 227 } 228