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