uart_cpu_fdt.c revision 257111
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: head/sys/dev/uart/uart_cpu_fdt.c 257111 2013-10-25 11:44:39Z ray $"); 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/* 49 * UART console routines. 50 */ 51bus_space_tag_t uart_bus_space_io; 52bus_space_tag_t uart_bus_space_mem; 53 54static int 55uart_fdt_get_clock(phandle_t node, pcell_t *cell) 56{ 57 pcell_t clock; 58 59 if ((OF_getprop(node, "clock-frequency", &clock, 60 sizeof(clock))) <= 0) 61 return (ENXIO); 62 63 if (clock == 0) 64 /* Try to retrieve parent 'bus-frequency' */ 65 /* XXX this should go to simple-bus fixup or so */ 66 if ((OF_getprop(OF_parent(node), "bus-frequency", &clock, 67 sizeof(clock))) <= 0) 68 clock = 0; 69 70 *cell = fdt32_to_cpu(clock); 71 return (0); 72} 73 74static int 75uart_fdt_get_shift(phandle_t node, pcell_t *cell) 76{ 77 pcell_t shift; 78 79 if ((OF_getprop(node, "reg-shift", &shift, sizeof(shift))) <= 0) 80 shift = 0; 81 *cell = fdt32_to_cpu(shift); 82 return (0); 83} 84 85int 86uart_cpu_eqres(struct uart_bas *b1, struct uart_bas *b2) 87{ 88 89 if (b1->bst != b2->bst) 90 return (0); 91 if (pmap_kextract(b1->bsh) == 0) 92 return (0); 93 if (pmap_kextract(b2->bsh) == 0) 94 return (0); 95 return ((pmap_kextract(b1->bsh) == pmap_kextract(b2->bsh)) ? 1 : 0); 96} 97 98int 99uart_cpu_getdev(int devtype, struct uart_devinfo *di) 100{ 101 char buf[64]; 102 struct uart_class *class; 103 phandle_t node, chosen; 104 pcell_t shift, br, rclk; 105 u_long start, size, pbase, psize; 106 int err; 107 108 uart_bus_space_mem = fdtbus_bs_tag; 109 uart_bus_space_io = NULL; 110 111 /* Allow overriding the FDT uning the environment. */ 112 class = &uart_ns8250_class; 113 err = uart_getenv(devtype, di, class); 114 if (!err) 115 return (0); 116 117 if (devtype != UART_DEV_CONSOLE) 118 return (ENXIO); 119 120 /* 121 * Retrieve /chosen/std{in,out}. 122 */ 123 if ((chosen = OF_finddevice("/chosen")) == -1) 124 return (ENXIO); 125 if (OF_getprop(chosen, "stdin", buf, sizeof(buf)) <= 0) 126 return (ENXIO); 127 if ((node = OF_finddevice(buf)) == -1) 128 return (ENXIO); 129 if (OF_getprop(chosen, "stdout", buf, sizeof(buf)) <= 0) 130 return (ENXIO); 131 if (OF_finddevice(buf) != node) 132 /* Only stdin == stdout is supported. */ 133 return (ENXIO); 134 /* 135 * Retrieve serial attributes. 136 */ 137 uart_fdt_get_shift(node, &shift); 138 139 if (OF_getprop(node, "current-speed", &br, sizeof(br)) <= 0) 140 br = 0; 141 br = fdt32_to_cpu(br); 142 143 if ((err = uart_fdt_get_clock(node, &rclk)) != 0) 144 return (err); 145 /* 146 * Finalize configuration. 147 */ 148 if (fdt_is_compatible(node, "fsl,imx-uart")) 149 class = &uart_imx_class; 150 else if (fdt_is_compatible(node, "quicc")) 151 class = &uart_quicc_class; 152 else if (fdt_is_compatible(node, "lpc")) 153 class = &uart_lpc_class; 154 else if (fdt_is_compatible(node, "arm,pl011")) 155 class = &uart_pl011_class; 156 else if (fdt_is_compatible(node, "exynos")) 157 class = &uart_s3c2410_class; 158 else if (fdt_is_compatible(node, "cadence,uart")) 159 class = &uart_cdnc_class; 160 else if (fdt_is_compatible(node, "ti,ns16550")) 161 class = &uart_ti8250_class; 162 else if (fdt_is_compatible(node, "ns16550")) 163 class = &uart_ns8250_class; 164 165 di->bas.chan = 0; 166 di->bas.regshft = (u_int)shift; 167 di->baudrate = br; 168 di->bas.rclk = (u_int)rclk; 169 di->ops = uart_getops(class); 170 di->databits = 8; 171 di->stopbits = 1; 172 di->parity = UART_PARITY_NONE; 173 di->bas.bst = uart_bus_space_mem; 174 175 err = fdt_regsize(node, &start, &size); 176 if (err) 177 return (ENXIO); 178 err = fdt_get_range(OF_parent(node), 0, &pbase, &psize); 179 if (err) 180 pbase = 0; 181 182 start += pbase; 183 184 return (bus_space_map(di->bas.bst, start, size, 0, &di->bas.bsh)); 185} 186