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 <vm/vm.h> 39 #include <vm/pmap.h> 40 41 #include <machine/bus.h> 42 #include <machine/fdt.h> 43 44 #include <dev/fdt/fdt_common.h> 45 #include <dev/ofw/ofw_bus.h> 46 #include <dev/ofw/ofw_bus_subr.h> 47 #include <dev/uart/uart.h> 48 #include <dev/uart/uart_bus.h> 49 #include <dev/uart/uart_cpu.h> 50 51 /* 52 * UART console routines. 53 */ 54 bus_space_tag_t uart_bus_space_io; 55 bus_space_tag_t uart_bus_space_mem; 56 57 static int 58 uart_fdt_get_clock(phandle_t node, pcell_t *cell) 59 { 60 pcell_t clock; 61 62 if ((OF_getprop(node, "clock-frequency", &clock, 63 sizeof(clock))) <= 0) 64 return (ENXIO); 65 66 if (clock == 0) 67 /* Try to retrieve parent 'bus-frequency' */ 68 /* XXX this should go to simple-bus fixup or so */ 69 if ((OF_getprop(OF_parent(node), "bus-frequency", &clock, 70 sizeof(clock))) <= 0) 71 clock = 0; 72 73 *cell = fdt32_to_cpu(clock); 74 return (0); 75 } 76 77 static int 78 uart_fdt_get_shift(phandle_t node, pcell_t *cell) 79 { 80 pcell_t shift; 81 82 if ((OF_getprop(node, "reg-shift", &shift, sizeof(shift))) <= 0) 83 shift = 0; 84 *cell = fdt32_to_cpu(shift); 85 return (0); 86 } 87 88 int 89 uart_cpu_eqres(struct uart_bas *b1, struct uart_bas *b2) 90 { 91 92 if (b1->bst != b2->bst) 93 return (0); 94 if (pmap_kextract(b1->bsh) == 0) 95 return (0); 96 if (pmap_kextract(b2->bsh) == 0) 97 return (0); 98 return ((pmap_kextract(b1->bsh) == pmap_kextract(b2->bsh)) ? 1 : 0); 99 } 100 101 int 102 uart_cpu_getdev(int devtype, struct uart_devinfo *di) 103 { 104 char buf[64]; 105 struct uart_class *class; 106 phandle_t node, chosen; 107 pcell_t shift, br, rclk; 108 u_long start, size, pbase, psize; 109 int err; 110 111 uart_bus_space_mem = fdtbus_bs_tag; 112 uart_bus_space_io = NULL; 113 114 /* Allow overriding the FDT uning the environment. */ 115 class = &uart_ns8250_class; 116 err = uart_getenv(devtype, di, class); 117 if (!err) 118 return (0); 119 120 if (devtype != UART_DEV_CONSOLE) 121 return (ENXIO); 122 123 /* 124 * Retrieve /chosen/std{in,out}. 125 */ 126 if ((chosen = OF_finddevice("/chosen")) == -1) 127 return (ENXIO); 128 if (OF_getprop(chosen, "stdin", buf, sizeof(buf)) <= 0) 129 return (ENXIO); 130 if ((node = OF_finddevice(buf)) == -1) 131 return (ENXIO); 132 if (OF_getprop(chosen, "stdout", buf, sizeof(buf)) <= 0) 133 return (ENXIO); 134 if (OF_finddevice(buf) != node) 135 /* Only stdin == stdout is supported. */ 136 return (ENXIO); 137 /* 138 * Retrieve serial attributes. 139 */ 140 uart_fdt_get_shift(node, &shift); 141 142 if (OF_getprop(node, "current-speed", &br, sizeof(br)) <= 0) 143 br = 0; 144 br = fdt32_to_cpu(br); 145 146 if ((err = uart_fdt_get_clock(node, &rclk)) != 0) 147 return (err); 148 /* 149 * Finalize configuration. 150 */ 151 if (fdt_is_compatible(node, "fsl,imx-uart")) 152 class = &uart_imx_class; 153 else if (fdt_is_compatible(node, "quicc")) 154 class = &uart_quicc_class; 155 else if (fdt_is_compatible(node, "lpc")) 156 class = &uart_lpc_class; 157 else if (fdt_is_compatible(node, "arm,pl011")) 158 class = &uart_pl011_class; 159 else if (fdt_is_compatible(node, "exynos")) 160 class = &uart_s3c2410_class; 161 else if (fdt_is_compatible(node, "cadence,uart")) 162 class = &uart_cdnc_class; 163 else if (fdt_is_compatible(node, "ti,ns16550")) 164 class = &uart_ti8250_class; 165 else if (fdt_is_compatible(node, "ns16550")) 166 class = &uart_ns8250_class; 167 168 di->bas.chan = 0; 169 di->bas.regshft = (u_int)shift; 170 di->baudrate = br; 171 di->bas.rclk = (u_int)rclk; 172 di->ops = uart_getops(class); 173 di->databits = 8; 174 di->stopbits = 1; 175 di->parity = UART_PARITY_NONE; 176 di->bas.bst = uart_bus_space_mem; 177 178 err = fdt_regsize(node, &start, &size); 179 if (err) 180 return (ENXIO); 181 err = fdt_get_range(OF_parent(node), 0, &pbase, &psize); 182 if (err) 183 pbase = 0; 184 185 start += pbase; 186 187 return (bus_space_map(di->bas.bst, start, size, 0, &di->bas.bsh)); 188 } 189