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 /* 49 * UART console routines. 50 */ 51 bus_space_tag_t uart_bus_space_io; 52 bus_space_tag_t uart_bus_space_mem; 53 54 static int 55 uart_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 74 static int 75 uart_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 85 int 86 uart_cpu_eqres(struct uart_bas *b1, struct uart_bas *b2) 87 { 88 89 return ((b1->bsh == b2->bsh && b1->bst == b2->bst) ? 1 : 0); 90 } 91 92 int 93 uart_cpu_getdev(int devtype, struct uart_devinfo *di) 94 { 95 char buf[64]; 96 struct uart_class *class; 97 phandle_t node, chosen; 98 pcell_t shift, br, rclk; 99 u_long start, size, pbase, psize; 100 int err; 101 102 uart_bus_space_mem = fdtbus_bs_tag; 103 uart_bus_space_io = NULL; 104 105 /* Allow overriding the FDT uning the environment. */ 106 class = &uart_ns8250_class; 107 err = uart_getenv(devtype, di, class); 108 if (!err) 109 return (0); 110 111 if (devtype != UART_DEV_CONSOLE) 112 return (ENXIO); 113 114 /* 115 * Retrieve /chosen/std{in,out}. 116 */ 117 if ((chosen = OF_finddevice("/chosen")) == -1) 118 return (ENXIO); 119 if (OF_getprop(chosen, "stdin", buf, sizeof(buf)) <= 0) 120 return (ENXIO); 121 if ((node = OF_finddevice(buf)) == -1) 122 return (ENXIO); 123 if (OF_getprop(chosen, "stdout", buf, sizeof(buf)) <= 0) 124 return (ENXIO); 125 if (OF_finddevice(buf) != node) 126 /* Only stdin == stdout is supported. */ 127 return (ENXIO); 128 /* 129 * Retrieve serial attributes. 130 */ 131 uart_fdt_get_shift(node, &shift); 132 133 if (OF_getprop(node, "current-speed", &br, sizeof(br)) <= 0) 134 br = 0; 135 br = fdt32_to_cpu(br); 136 137 if ((err = uart_fdt_get_clock(node, &rclk)) != 0) 138 return (err); 139 /* 140 * Finalize configuration. 141 */ 142 if (fdt_is_compatible(node, "fsl,imx-uart")) 143 class = &uart_imx_class; 144 if (fdt_is_compatible(node, "quicc")) 145 class = &uart_quicc_class; 146 if (fdt_is_compatible(node, "lpc")) 147 class = &uart_lpc_class; 148 if (fdt_is_compatible(node, "ns16550")) 149 class = &uart_ns8250_class; 150 if (fdt_is_compatible(node, "arm,pl011")) 151 class = &uart_pl011_class; 152 if (fdt_is_compatible(node, "cadence,uart")) 153 class = &uart_cdnc_class; 154 155 di->bas.chan = 0; 156 di->bas.regshft = (u_int)shift; 157 di->baudrate = br; 158 di->bas.rclk = (u_int)rclk; 159 di->ops = uart_getops(class); 160 di->databits = 8; 161 di->stopbits = 1; 162 di->parity = UART_PARITY_NONE; 163 di->bas.bst = uart_bus_space_mem; 164 165 err = fdt_regsize(node, &start, &size); 166 if (err) 167 return (ENXIO); 168 err = fdt_get_range(OF_parent(node), 0, &pbase, &psize); 169 if (err) 170 pbase = 0; 171 172 start += pbase; 173 174 return (bus_space_map(di->bas.bst, start, size, 0, &di->bas.bsh)); 175 } 176