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 <sys/param.h> 34 #include <sys/bus.h> 35 #include <sys/kernel.h> 36 #include <sys/module.h> 37 38 #include <machine/bus.h> 39 #include <machine/fdt.h> 40 41 #include <dev/fdt/fdt_common.h> 42 #include <dev/ofw/ofw_bus.h> 43 #include <dev/ofw/ofw_bus_subr.h> 44 #include <dev/uart/uart.h> 45 #include <dev/uart/uart_bus.h> 46 #include <dev/uart/uart_cpu.h> 47 48 static int uart_fdt_probe(device_t); 49 50 static device_method_t uart_fdt_methods[] = { 51 /* Device interface */ 52 DEVMETHOD(device_probe, uart_fdt_probe), 53 DEVMETHOD(device_attach, uart_bus_attach), 54 DEVMETHOD(device_detach, uart_bus_detach), 55 { 0, 0 } 56 }; 57 58 static driver_t uart_fdt_driver = { 59 uart_driver_name, 60 uart_fdt_methods, 61 sizeof(struct uart_softc), 62 }; 63 64 static int 65 uart_fdt_get_clock(phandle_t node, pcell_t *cell) 66 { 67 pcell_t clock; 68 69 if ((OF_getprop(node, "clock-frequency", &clock, 70 sizeof(clock))) <= 0) 71 return (ENXIO); 72 73 if (clock == 0) 74 /* Try to retrieve parent 'bus-frequency' */ 75 /* XXX this should go to simple-bus fixup or so */ 76 if ((OF_getprop(OF_parent(node), "bus-frequency", &clock, 77 sizeof(clock))) <= 0) 78 clock = 0; 79 80 *cell = fdt32_to_cpu(clock); 81 return (0); 82 } 83 84 static int 85 uart_fdt_get_shift(phandle_t node, pcell_t *cell) 86 { 87 pcell_t shift; 88 89 if ((OF_getprop(node, "reg-shift", &shift, sizeof(shift))) <= 0) 90 shift = 0; 91 *cell = fdt32_to_cpu(shift); 92 return (0); 93 } 94 95 static int 96 uart_fdt_probe(device_t dev) 97 { 98 struct uart_softc *sc; 99 phandle_t node; 100 pcell_t clock, shift; 101 int err; 102 103 sc = device_get_softc(dev); 104 if (ofw_bus_is_compatible(dev, "ns16550")) 105 sc->sc_class = &uart_ns8250_class; 106 else if (ofw_bus_is_compatible(dev, "lpc,uart")) 107 sc->sc_class = &uart_lpc_class; 108 else if (ofw_bus_is_compatible(dev, "arm,pl011")) 109 sc->sc_class = &uart_pl011_class; 110 else 111 return (ENXIO); 112 113 node = ofw_bus_get_node(dev); 114 115 if ((err = uart_fdt_get_clock(node, &clock)) != 0) 116 return (err); 117 uart_fdt_get_shift(node, &shift); 118 119 return (uart_bus_probe(dev, (int)shift, (int)clock, 0, 0)); 120 } 121 122 DRIVER_MODULE(uart, simplebus, uart_fdt_driver, uart_devclass, 0, 0); 123 124 /* 125 * UART console routines. 126 */ 127 bus_space_tag_t uart_bus_space_io; 128 bus_space_tag_t uart_bus_space_mem; 129 130 int 131 uart_cpu_eqres(struct uart_bas *b1, struct uart_bas *b2) 132 { 133 134 return ((b1->bsh == b2->bsh && b1->bst == b2->bst) ? 1 : 0); 135 } 136 137 int 138 uart_cpu_getdev(int devtype, struct uart_devinfo *di) 139 { 140 char buf[64]; 141 struct uart_class *class; 142 phandle_t node, chosen; 143 pcell_t shift, br, rclk; 144 u_long start, size, pbase, psize; 145 int err; 146 147 uart_bus_space_mem = fdtbus_bs_tag; 148 uart_bus_space_io = NULL; 149 150 /* Allow overriding the FDT uning the environment. */ 151 class = &uart_ns8250_class; 152 err = uart_getenv(devtype, di, class); 153 if (!err) 154 return (0); 155 156 if (devtype != UART_DEV_CONSOLE) 157 return (ENXIO); 158 159 /* 160 * Retrieve /chosen/std{in,out}. 161 */ 162 if ((chosen = OF_finddevice("/chosen")) == -1) 163 return (ENXIO); 164 if (OF_getprop(chosen, "stdin", buf, sizeof(buf)) <= 0) 165 return (ENXIO); 166 if ((node = OF_finddevice(buf)) == -1) 167 return (ENXIO); 168 if (OF_getprop(chosen, "stdout", buf, sizeof(buf)) <= 0) 169 return (ENXIO); 170 if (OF_finddevice(buf) != node) 171 /* Only stdin == stdout is supported. */ 172 return (ENXIO); 173 /* 174 * Retrieve serial attributes. 175 */ 176 uart_fdt_get_shift(node, &shift); 177 178 if (OF_getprop(node, "current-speed", &br, sizeof(br)) <= 0) 179 br = 0; 180 br = fdt32_to_cpu(br); 181 182 if ((err = uart_fdt_get_clock(node, &rclk)) != 0) 183 return (err); 184 /* 185 * Finalize configuration. 186 */ 187 if (fdt_is_compatible(node, "quicc")) 188 class = &uart_quicc_class; 189 if (fdt_is_compatible(node, "lpc")) 190 class = &uart_lpc_class; 191 if (fdt_is_compatible(node, "ns16550")) 192 class = &uart_ns8250_class; 193 if (fdt_is_compatible(node, "arm,pl011")) 194 class = &uart_pl011_class; 195 196 di->bas.chan = 0; 197 di->bas.regshft = (u_int)shift; 198 di->baudrate = br; 199 di->bas.rclk = (u_int)rclk; 200 di->ops = uart_getops(class); 201 di->databits = 8; 202 di->stopbits = 1; 203 di->parity = UART_PARITY_NONE; 204 di->bas.bst = uart_bus_space_mem; 205 206 err = fdt_regsize(node, &start, &size); 207 if (err) 208 return (ENXIO); 209 err = fdt_get_range(OF_parent(node), 0, &pbase, &psize); 210 if (err) 211 pbase = 0; 212 213 start += pbase; 214 215 return (bus_space_map(di->bas.bst, start, size, 0, &di->bas.bsh)); 216 } 217