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fdt_pinctrl.c revision 1.2
      1 /* $NetBSD: fdt_pinctrl.c,v 1.1 2015/12/30 04:23:39 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 1.1 2015/12/30 04:23:39 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