1 /* $NetBSD: fdt_pinctrl.c,v 1.2 2016/01/01 22:35:44 marty Exp $ */ 2 3 /*- 4 * Copyright (c) 2015 Martin Fouts 5 * All rights reserved. 6 * 7 * Redistribution and use in source and binary forms, with or without 8 * modification, are permitted provided that the following conditions 9 * are met: 10 * 1. Redistributions of source code must retain the above copyright 11 * notice, this list of conditions and the following disclaimer. 12 * 2. Redistributions in binary form must reproduce the above copyright 13 * notice, this list of conditions and the following disclaimer in the 14 * documentation and/or other materials provided with the distribution. 15 * 16 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR 17 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES 18 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 19 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, 20 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, 21 * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; 22 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED 23 * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, 24 * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 25 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 26 * SUCH DAMAGE. 27 */ 28 29 #include <sys/cdefs.h> 30 __KERNEL_RCSID(0, "$NetBSD: fdt_pinctrl.c,v 1.2 2016/01/01 22:35:44 marty Exp $"); 31 32 #include <sys/param.h> 33 #include <sys/bus.h> 34 #include <sys/kmem.h> 35 36 #include <libfdt.h> 37 #include <dev/fdt/fdtvar.h> 38 39 struct fdtbus_pinctrl_controller { 40 int pc_phandle; 41 void *pc_cookie; 42 const struct fdtbus_pinctrl_controller_func *pc_funcs; 43 44 struct fdtbus_pinctrl_controller *pc_next; 45 }; 46 47 static struct fdtbus_pinctrl_controller *fdtbus_pc = NULL; 48 49 int 50 fdtbus_register_pinctrl_config(void *cookie, int phandle, 51 const struct fdtbus_pinctrl_controller_func *funcs) 52 { 53 struct fdtbus_pinctrl_controller *pc; 54 55 pc = kmem_alloc(sizeof(*pc), KM_SLEEP); 56 pc->pc_cookie = cookie; 57 pc->pc_phandle = phandle; 58 pc->pc_funcs = funcs; 59 60 pc->pc_next = fdtbus_pc; 61 fdtbus_pc = pc; 62 63 return 0; 64 } 65 66 static struct fdtbus_pinctrl_controller * 67 fdtbus_pinctrl_lookup(int phandle) 68 { 69 struct fdtbus_pinctrl_controller *pc; 70 71 for (pc = fdtbus_pc; pc; pc = pc->pc_next) 72 if (pc->pc_phandle == phandle) 73 return pc; 74 75 return NULL; 76 } 77 78 int 79 fdtbus_pinctrl_set_config_index(int phandle, u_int index) 80 { 81 char buf[80]; 82 int len, handle; 83 struct fdtbus_pinctrl_controller *pc; 84 85 snprintf(buf, 80, "pinctrl-%d", index); 86 87 len = OF_getprop(phandle, buf, (char *)&handle, 88 sizeof(handle)); 89 if (len != sizeof(int)) { 90 printf("%s: couldn't get %s.\n", __func__, buf); 91 return -1; 92 } 93 94 handle = fdtbus_get_phandle_from_native(be32toh(handle)); 95 96 pc = fdtbus_pinctrl_lookup(handle); 97 if (!pc) { 98 printf("%s: Couldn't get handle %d for %s\n", __func__, handle, 99 buf); 100 return -1; 101 } 102 103 return pc->pc_funcs->set_config(pc->pc_cookie); 104 } 105 106 int 107 fdtbus_pinctrl_set_config(int phandle, const char *cfgname) 108 { 109 int index = 0; 110 int len; 111 char *result; 112 char *next; 113 114 len = OF_getproplen(phandle, "pinctrl-names"); 115 if (len <= 0) 116 return -1; 117 result = kmem_zalloc(len, KM_SLEEP); 118 OF_getprop(phandle, "pinctrl-names", result, len); 119 120 next = result; 121 while (next - result < len) { 122 if (!strcmp(next, cfgname)) { 123 return fdtbus_pinctrl_set_config_index(phandle, index); 124 } 125 index++; 126 while (*next) 127 next++; 128 next++; 129 } 130 131 return -1; 132 } 133