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 #include <machine/fdt.h> 46 47 #include <dev/fdt/fdt_common.h> 48 #include <dev/ofw/ofw_bus.h> 49 #include <dev/ofw/ofw_bus_subr.h> 50 #include <dev/uart/uart.h> 51 #include <dev/uart/uart_bus.h> 52 #include <dev/uart/uart_cpu.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 static int 61 uart_fdt_get_clock(phandle_t node, pcell_t *cell) 62 { 63 pcell_t clock; 64 65 /* clock-frequency is a FreeBSD-only extention. */ 66 if ((OF_getprop(node, "clock-frequency", &clock, 67 sizeof(clock))) <= 0) 68 clock = 0; 69 70 if (clock == 0) 71 /* Try to retrieve parent 'bus-frequency' */ 72 /* XXX this should go to simple-bus fixup or so */ 73 if ((OF_getprop(OF_parent(node), "bus-frequency", &clock, 74 sizeof(clock))) <= 0) 75 clock = 0; 76 77 *cell = fdt32_to_cpu(clock); 78 return (0); 79 } 80 81 static int 82 uart_fdt_get_shift(phandle_t node, pcell_t *cell) 83 { 84 pcell_t shift; 85 86 if ((OF_getprop(node, "reg-shift", &shift, sizeof(shift))) <= 0) 87 shift = 0; 88 *cell = fdt32_to_cpu(shift); 89 return (0); 90 } 91 92 int 93 uart_cpu_eqres(struct uart_bas *b1, struct uart_bas *b2) 94 { 95 96 if (b1->bst != b2->bst) 97 return (0); 98 if (pmap_kextract(b1->bsh) == 0) 99 return (0); 100 if (pmap_kextract(b2->bsh) == 0) 101 return (0); 102 return ((pmap_kextract(b1->bsh) == pmap_kextract(b2->bsh)) ? 1 : 0); 103 } 104 105 static int 106 phandle_chosen_propdev(phandle_t chosen, const char *name, phandle_t *node) 107 { 108 char buf[64]; 109 110 if (OF_getprop(chosen, name, buf, sizeof(buf)) <= 0) 111 return (ENXIO); 112 if ((*node = OF_finddevice(buf)) == -1) 113 return (ENXIO); 114 115 return (0); 116 } 117 118 int 119 uart_cpu_getdev(int devtype, struct uart_devinfo *di) 120 { 121 const char *propnames[] = {"stdout-path", "linux,stdout-path", "stdout", 122 "stdin-path", "stdin", NULL}; 123 const char **name; 124 const struct ofw_compat_data *cd; 125 struct uart_class *class; 126 phandle_t node, chosen; 127 pcell_t shift, br, rclk; 128 u_long start, size, pbase, psize; 129 int err; 130 131 uart_bus_space_mem = fdtbus_bs_tag; 132 uart_bus_space_io = NULL; 133 134 /* Allow overriding the FDT using the environment. */ 135 class = &uart_ns8250_class; 136 err = uart_getenv(devtype, di, class); 137 if (!err) 138 return (0); 139 140 if (devtype != UART_DEV_CONSOLE) 141 return (ENXIO); 142 143 /* 144 * Retrieve /chosen/std{in,out}. 145 */ 146 node = -1; 147 if ((chosen = OF_finddevice("/chosen")) != -1) { 148 for (name = propnames; *name != NULL; name++) { 149 if (phandle_chosen_propdev(chosen, *name, &node) == 0) 150 break; 151 } 152 } 153 if (chosen == -1 || *name == NULL) 154 node = OF_finddevice("serial0"); /* Last ditch */ 155 156 if (node == -1) /* Can't find anything */ 157 return (ENXIO); 158 159 /* 160 * Retrieve serial attributes. 161 */ 162 uart_fdt_get_shift(node, &shift); 163 164 if (OF_getprop(node, "current-speed", &br, sizeof(br)) <= 0) 165 br = 0; 166 br = fdt32_to_cpu(br); 167 168 if ((err = uart_fdt_get_clock(node, &rclk)) != 0) 169 return (err); 170 /* 171 * Finalize configuration. 172 */ 173 for (cd = uart_fdt_compat_data; cd->ocd_str != NULL; ++cd) { 174 if (fdt_is_compatible(node, cd->ocd_str)) 175 break; 176 } 177 if (cd->ocd_str == NULL) 178 return (ENXIO); 179 class = (struct uart_class *)cd->ocd_data; 180 181 di->bas.chan = 0; 182 di->bas.regshft = (u_int)shift; 183 di->baudrate = br; 184 di->bas.rclk = (u_int)rclk; 185 di->ops = uart_getops(class); 186 di->databits = 8; 187 di->stopbits = 1; 188 di->parity = UART_PARITY_NONE; 189 di->bas.bst = uart_bus_space_mem; 190 191 err = fdt_regsize(node, &start, &size); 192 if (err) 193 return (ENXIO); 194 err = fdt_get_range(OF_parent(node), 0, &pbase, &psize); 195 if (err) 196 pbase = 0; 197 198 start += pbase; 199 200 return (bus_space_map(di->bas.bst, start, size, 0, &di->bas.bsh)); 201 } 202