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 40 #include <machine/bus.h> 41 42 #include <dev/fdt/fdt_common.h> 43 #include <dev/ofw/ofw_bus.h> 44 #include <dev/ofw/ofw_bus_subr.h> 45 #include <dev/uart/uart.h> 46 #include <dev/uart/uart_bus.h> 47 #include <dev/uart/uart_cpu.h> 48 #include <dev/uart/uart_cpu_fdt.h> 49 50 static int uart_fdt_probe(device_t); 51 52 static device_method_t uart_fdt_methods[] = { 53 /* Device interface */ 54 DEVMETHOD(device_probe, uart_fdt_probe), 55 DEVMETHOD(device_attach, uart_bus_attach), 56 DEVMETHOD(device_detach, uart_bus_detach), 57 { 0, 0 } 58 }; 59 60 static driver_t uart_fdt_driver = { 61 uart_driver_name, 62 uart_fdt_methods, 63 sizeof(struct uart_softc), 64 }; 65 66 int 67 uart_fdt_get_clock(phandle_t node, pcell_t *cell) 68 { 69 70 /* clock-frequency is a FreeBSD-only extention. */ 71 if ((OF_getencprop(node, "clock-frequency", cell, 72 sizeof(*cell))) <= 0) { 73 /* Try to retrieve parent 'bus-frequency' */ 74 /* XXX this should go to simple-bus fixup or so */ 75 if ((OF_getencprop(OF_parent(node), "bus-frequency", cell, 76 sizeof(*cell))) <= 0) 77 *cell = 0; 78 } 79 80 return (0); 81 } 82 83 int 84 uart_fdt_get_shift(phandle_t node, pcell_t *cell) 85 { 86 #ifdef __aarch64__ 87 #define DEFAULT_SHIFT 2 88 #else 89 #define DEFAULT_SHIFT 0 90 #endif 91 92 if ((OF_getencprop(node, "reg-shift", cell, sizeof(*cell))) <= 0) 93 *cell = DEFAULT_SHIFT; 94 return (0); 95 #undef DEFAULT_SHIFT 96 } 97 98 static uintptr_t 99 uart_fdt_find_device(device_t dev) 100 { 101 struct ofw_compat_data **cd; 102 const struct ofw_compat_data *ocd; 103 104 SET_FOREACH(cd, uart_fdt_class_and_device_set) { 105 ocd = ofw_bus_search_compatible(dev, *cd); 106 if (ocd->ocd_data != 0) 107 return (ocd->ocd_data); 108 } 109 return (0); 110 } 111 112 static int 113 uart_fdt_probe(device_t dev) 114 { 115 struct uart_softc *sc; 116 phandle_t node; 117 pcell_t clock, shift; 118 int err; 119 120 sc = device_get_softc(dev); 121 122 if (!ofw_bus_status_okay(dev)) 123 return (ENXIO); 124 125 sc->sc_class = (struct uart_class *)uart_fdt_find_device(dev); 126 if (sc->sc_class == NULL) 127 return (ENXIO); 128 129 node = ofw_bus_get_node(dev); 130 131 if ((err = uart_fdt_get_clock(node, &clock)) != 0) 132 return (err); 133 uart_fdt_get_shift(node, &shift); 134 135 return (uart_bus_probe(dev, (int)shift, (int)clock, 0, 0)); 136 } 137 138 DRIVER_MODULE(uart, simplebus, uart_fdt_driver, uart_devclass, 0, 0); 139 DRIVER_MODULE(uart, ofwbus, uart_fdt_driver, uart_devclass, 0, 0); 140