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fdt_pinctrl.c revision 1.4.6.1 
      1 /* $NetBSD: fdt_pinctrl.c,v 1.4.6.1 2018/07/28 04:37:44 pgoyette Exp $ */
      2 
      3 /*-
      4  * Copyright (c) 2017 Jared McNeill <jmcneill (at) invisible.ca>
      5  * Copyright (c) 2015 Martin Fouts
      6  * All rights reserved.
      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 ``AS IS'' AND ANY EXPRESS OR
     18  * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
     19  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
     20  * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
     21  * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
     22  * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
     23  * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
     24  * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
     25  * 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 __KERNEL_RCSID(0, "$NetBSD: fdt_pinctrl.c,v 1.4.6.1 2018/07/28 04:37:44 pgoyette Exp $");
     32 
     33 #include <sys/param.h>
     34 #include <sys/bus.h>
     35 #include <sys/kmem.h>
     36 #include <sys/queue.h>
     37 
     38 #include <libfdt.h>
     39 #include <dev/fdt/fdtvar.h>
     40 
     41 struct fdtbus_pinctrl_controller {
     42 	device_t pc_dev;
     43 	int pc_phandle;
     44 	const struct fdtbus_pinctrl_controller_func *pc_funcs;
     45 
     46 	LIST_ENTRY(fdtbus_pinctrl_controller) pc_next;
     47 };
     48 
     49 static LIST_HEAD(, fdtbus_pinctrl_controller) fdtbus_pinctrl_controllers =
     50     LIST_HEAD_INITIALIZER(fdtbus_pinctrl_controllers);
     51 
     52 int
     53 fdtbus_register_pinctrl_config(device_t dev, int phandle,
     54     const struct fdtbus_pinctrl_controller_func *funcs)
     55 {
     56 	struct fdtbus_pinctrl_controller *pc;
     57 
     58 	pc = kmem_alloc(sizeof(*pc), KM_SLEEP);
     59 	pc->pc_dev = dev;
     60 	pc->pc_phandle = phandle;
     61 	pc->pc_funcs = funcs;
     62 
     63 	LIST_INSERT_HEAD(&fdtbus_pinctrl_controllers, pc, pc_next);
     64 
     65 	return 0;
     66 }
     67 
     68 static struct fdtbus_pinctrl_controller *
     69 fdtbus_pinctrl_lookup(int phandle)
     70 {
     71 	struct fdtbus_pinctrl_controller *pc;
     72 
     73 	LIST_FOREACH(pc, &fdtbus_pinctrl_controllers, pc_next) {
     74 		if (pc->pc_phandle == phandle)
     75 			return pc;
     76 	}
     77 
     78 	return NULL;
     79 }
     80 
     81 int
     82 fdtbus_pinctrl_set_config_index(int phandle, u_int index)
     83 {
     84 	struct fdtbus_pinctrl_controller *pc;
     85 	const u_int *pinctrl_data;
     86 	char buf[16];
     87 	u_int xref, pinctrl_cells;
     88 	int len, error;
     89 
     90 	snprintf(buf, sizeof(buf), "pinctrl-%u", index);
     91 
     92 	pinctrl_data = fdtbus_get_prop(phandle, buf, &len);
     93 	if (pinctrl_data == NULL)
     94 		return ENOENT;
     95 
     96 	while (len > 0) {
     97 		xref = fdtbus_get_phandle_from_native(be32toh(pinctrl_data[0]));
     98 		pc = fdtbus_pinctrl_lookup(xref);
     99 		if (pc == NULL)
    100 			return ENXIO;
    101 
    102 		if (of_getprop_uint32(OF_parent(xref), "#pinctrl-cells", &pinctrl_cells) != 0)
    103 			pinctrl_cells = 1;
    104 
    105 		error = pc->pc_funcs->set_config(pc->pc_dev, pinctrl_data, pinctrl_cells * 4);
    106 		if (error != 0)
    107 			return error;
    108 
    109 		pinctrl_data += pinctrl_cells;
    110 		len -= (pinctrl_cells * 4);
    111 	}
    112 
    113 	return 0;
    114 }
    115 
    116 int
    117 fdtbus_pinctrl_set_config(int phandle, const char *cfgname)
    118 {
    119 	const char *pinctrl_names, *name;
    120 	int len, index;
    121 
    122 	if ((len = OF_getproplen(phandle, "pinctrl-names")) < 0)
    123 		return -1;
    124 
    125 	pinctrl_names = fdtbus_get_string(phandle, "pinctrl-names");
    126 
    127 	for (name = pinctrl_names, index = 0; len > 0;
    128 	     name += strlen(name) + 1, index++) {
    129 		if (strcmp(name, cfgname) == 0)
    130 			return fdtbus_pinctrl_set_config_index(phandle, index);
    131 	}
    132 
    133 	/* Not found */
    134 	return -1;
    135 }
    136 
    137 static void
    138 fdtbus_pinctrl_configure_node(int phandle)
    139 {
    140 	char buf[256];
    141 	int child, error;
    142 
    143 	for (child = OF_child(phandle); child; child = OF_peer(child)) {
    144 		if (!fdtbus_status_okay(child))
    145 			continue;
    146 
    147 		/* Configure child nodes */
    148 		fdtbus_pinctrl_configure_node(child);
    149 
    150 		/*
    151 		 * Set configuration 0 for this node. This may fail if the
    152 		 * pinctrl provider is missing; that's OK, we will re-configure
    153 		 * when that provider attaches.
    154 		 */
    155 		fdtbus_get_path(child, buf, sizeof(buf));
    156 		error = fdtbus_pinctrl_set_config_index(child, 0);
    157 		if (error == 0)
    158 			aprint_debug("pinctrl: set config pinctrl-0 for %s\n", buf);
    159 		else if (error != ENOENT)
    160 			aprint_debug("pinctrl: failed to set config pinctrl-0 for %s: %d\n", buf, error);
    161 	}
    162 }
    163 
    164 void
    165 fdtbus_pinctrl_configure(void)
    166 {
    167 	fdtbus_pinctrl_configure_node(OF_finddevice("/"));
    168 }
    169