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 49 static int uart_fdt_probe(device_t); 50 51 static device_method_t uart_fdt_methods[] = { 52 /* Device interface */ 53 DEVMETHOD(device_probe, uart_fdt_probe), 54 DEVMETHOD(device_attach, uart_bus_attach), 55 DEVMETHOD(device_detach, uart_bus_detach), 56 { 0, 0 } 57 }; 58 59 static driver_t uart_fdt_driver = { 60 uart_driver_name, 61 uart_fdt_methods, 62 sizeof(struct uart_softc), 63 }; 64 65 /* 66 * Compatible devices. Keep this sorted in most- to least-specific order first, 67 * alphabetical second. That is, "zwie,ns16550" should appear before "ns16550" 68 * on the theory that the zwie driver knows how to make better use of the 69 * hardware than the generic driver. Likewise with chips within a family, the 70 * highest-numbers / most recent models should probably appear earlier. 71 */ 72 static struct ofw_compat_data compat_data[] = { 73 {"arm,pl011", (uintptr_t)&uart_pl011_class}, 74 {"atmel,at91rm9200-usart",(uintptr_t)&at91_usart_class}, 75 {"atmel,at91sam9260-usart",(uintptr_t)&at91_usart_class}, 76 {"cadence,uart", (uintptr_t)&uart_cdnc_class}, 77 {"exynos", (uintptr_t)&uart_s3c2410_class}, 78 {"fsl,imx6q-uart", (uintptr_t)&uart_imx_class}, 79 {"fsl,imx53-uart", (uintptr_t)&uart_imx_class}, 80 {"fsl,imx51-uart", (uintptr_t)&uart_imx_class}, 81 {"fsl,imx31-uart", (uintptr_t)&uart_imx_class}, 82 {"fsl,imx27-uart", (uintptr_t)&uart_imx_class}, 83 {"fsl,imx25-uart", (uintptr_t)&uart_imx_class}, 84 {"fsl,imx21-uart", (uintptr_t)&uart_imx_class}, 85 {"fsl,mvf600-uart", (uintptr_t)&uart_vybrid_class}, 86 {"lpc,uart", (uintptr_t)&uart_lpc_class}, 87 {"ti,ns16550", (uintptr_t)&uart_ti8250_class}, 88 {"ns16550", (uintptr_t)&uart_ns8250_class}, 89 {NULL, (uintptr_t)NULL}, 90 }; 91 92 /* Export the compat_data table for use by the uart_cpu_fdt.c probe routine. */ 93 const struct ofw_compat_data *uart_fdt_compat_data = compat_data; 94 95 static int 96 uart_fdt_get_clock(phandle_t node, pcell_t *cell) 97 { 98 pcell_t clock; 99 100 /* 101 * clock-frequency is a FreeBSD-specific hack. Make its presence optional. 102 */ 103 if ((OF_getprop(node, "clock-frequency", &clock, 104 sizeof(clock))) <= 0) 105 clock = 0; 106 107 if (clock == 0) 108 /* Try to retrieve parent 'bus-frequency' */ 109 /* XXX this should go to simple-bus fixup or so */ 110 if ((OF_getprop(OF_parent(node), "bus-frequency", &clock, 111 sizeof(clock))) <= 0) 112 clock = 0; 113 114 *cell = fdt32_to_cpu(clock); 115 return (0); 116 } 117 118 static int 119 uart_fdt_get_shift(phandle_t node, pcell_t *cell) 120 { 121 pcell_t shift; 122 123 if ((OF_getprop(node, "reg-shift", &shift, sizeof(shift))) <= 0) 124 shift = 0; 125 *cell = fdt32_to_cpu(shift); 126 return (0); 127 } 128 129 static int 130 uart_fdt_probe(device_t dev) 131 { 132 struct uart_softc *sc; 133 phandle_t node; 134 pcell_t clock, shift; 135 int err; 136 const struct ofw_compat_data * cd; 137 138 sc = device_get_softc(dev); 139 140 if (!ofw_bus_status_okay(dev)) 141 return (ENXIO); 142 143 cd = ofw_bus_search_compatible(dev, compat_data); 144 if (cd->ocd_data == (uintptr_t)NULL) 145 return (ENXIO); 146 147 sc->sc_class = (struct uart_class *)cd->ocd_data; 148 149 node = ofw_bus_get_node(dev); 150 151 if ((err = uart_fdt_get_clock(node, &clock)) != 0) 152 return (err); 153 uart_fdt_get_shift(node, &shift); 154 155 return (uart_bus_probe(dev, (int)shift, (int)clock, 0, 0)); 156 } 157 158 DRIVER_MODULE(uart, simplebus, uart_fdt_driver, uart_devclass, 0, 0); 159