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 char *cp; 137 int err; 138 139 uart_bus_space_mem = fdtbus_bs_tag; 140 uart_bus_space_io = NULL; 141 142 /* Allow overriding the FDT using the environment. */ 143 class = &uart_ns8250_class; 144 err = uart_getenv(devtype, di, class); 145 if (!err) 146 return (0); 147 148 if (devtype != UART_DEV_CONSOLE) 149 return (ENXIO); 150 151 /* Has the user forced a specific device node? */ 152 cp = kern_getenv("hw.fdt.console"); 153 if (cp == NULL) { 154 /* 155 * Retrieve /chosen/std{in,out}. 156 */ 157 node = -1; 158 if ((chosen = OF_finddevice("/chosen")) != -1) { 159 for (name = propnames; *name != NULL; name++) { 160 if (phandle_chosen_propdev(chosen, *name, 161 &node) == 0) 162 break; 163 } 164 } 165 if (chosen == -1 || *name == NULL) 166 node = OF_finddevice("serial0"); /* Last ditch */ 167 } else { 168 node = OF_finddevice(cp); 169 } 170 171 if (node == -1) /* Can't find anything */ 172 return (ENXIO); 173 174 /* 175 * Check old style of UART definition first. Unfortunately, the common 176 * FDT processing is not possible if we have clock, power domains and 177 * pinmux stuff. 178 */ 179 class = (struct uart_class *)uart_fdt_find_by_node(node, 0); 180 if (class != NULL) { 181 if ((err = uart_fdt_get_clock(node, &rclk)) != 0) 182 return (err); 183 } else { 184 /* Check class only linker set */ 185 class = 186 (struct uart_class *)uart_fdt_find_by_node(node, 1); 187 if (class == NULL) 188 return (ENXIO); 189 rclk = 0; 190 } 191 192 /* 193 * Retrieve serial attributes. 194 */ 195 if (uart_fdt_get_shift(node, &shift) != 0) 196 shift = uart_getregshift(class); 197 198 if (OF_getprop(node, "current-speed", &br, sizeof(br)) <= 0) 199 br = 0; 200 else 201 br = fdt32_to_cpu(br); 202 203 /* 204 * Finalize configuration. 205 */ 206 di->bas.chan = 0; 207 di->bas.regshft = (u_int)shift; 208 di->baudrate = br; 209 di->bas.rclk = (u_int)rclk; 210 di->ops = uart_getops(class); 211 di->databits = 8; 212 di->stopbits = 1; 213 di->parity = UART_PARITY_NONE; 214 215 return (OF_decode_addr(node, 0, &di->bas.bst, &di->bas.bsh)); 216 } 217