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fdt_phy.c revision 1.2 
      1 /* $NetBSD: fdt_phy.c,v 1.2 2018/06/30 20:34:43 jmcneill Exp $ */
      2 
      3 /*-
      4  * Copyright (c) 2015-2017 Jared McNeill <jmcneill (at) invisible.ca>
      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_phy.c,v 1.2 2018/06/30 20:34:43 jmcneill Exp $");
     31 
     32 #include <sys/param.h>
     33 #include <sys/bus.h>
     34 #include <sys/kmem.h>
     35 #include <sys/queue.h>
     36 
     37 #include <libfdt.h>
     38 #include <dev/fdt/fdtvar.h>
     39 
     40 struct fdtbus_phy_controller {
     41 	device_t pc_dev;
     42 	int pc_phandle;
     43 	const struct fdtbus_phy_controller_func *pc_funcs;
     44 
     45 	LIST_ENTRY(fdtbus_phy_controller) pc_next;
     46 };
     47 
     48 static LIST_HEAD(, fdtbus_phy_controller) fdtbus_phy_controllers =
     49     LIST_HEAD_INITIALIZER(fdtbus_phy_controllers);
     50 
     51 int
     52 fdtbus_register_phy_controller(device_t dev, int phandle,
     53     const struct fdtbus_phy_controller_func *funcs)
     54 {
     55 	struct fdtbus_phy_controller *pc;
     56 
     57 	pc = kmem_alloc(sizeof(*pc), KM_SLEEP);
     58 	pc->pc_dev = dev;
     59 	pc->pc_phandle = phandle;
     60 	pc->pc_funcs = funcs;
     61 
     62 	LIST_INSERT_HEAD(&fdtbus_phy_controllers, pc, pc_next);
     63 
     64 	return 0;
     65 }
     66 
     67 static struct fdtbus_phy_controller *
     68 fdtbus_get_phy_controller(int phandle)
     69 {
     70 	struct fdtbus_phy_controller *pc;
     71 
     72 	LIST_FOREACH(pc, &fdtbus_phy_controllers, pc_next) {
     73 		if (pc->pc_phandle == phandle)
     74 			return pc;
     75 	}
     76 
     77 	return NULL;
     78 }
     79 
     80 struct fdtbus_phy *
     81 fdtbus_phy_get_index(int phandle, u_int index)
     82 {
     83 	struct fdtbus_phy_controller *pc;
     84 	struct fdtbus_phy *phy = NULL;
     85 	void *phy_priv = NULL;
     86 	uint32_t *phys = NULL;
     87 	uint32_t *p;
     88 	u_int n, phy_cells;
     89 	int len, resid;
     90 
     91 	len = OF_getproplen(phandle, "phys");
     92 	if (len <= 0)
     93 		return NULL;
     94 
     95 	phys = kmem_alloc(len, KM_SLEEP);
     96 	if (OF_getprop(phandle, "phys", phys, len) != len) {
     97 		kmem_free(phys, len);
     98 		return NULL;
     99 	}
    100 
    101 	p = phys;
    102 	for (n = 0, resid = len; resid > 0; n++) {
    103 		const int pc_phandle =
    104 		    fdtbus_get_phandle_from_native(be32toh(p[0]));
    105 		if (of_getprop_uint32(pc_phandle, "#phy-cells", &phy_cells))
    106 			break;
    107 		if (n == index) {
    108 			pc = fdtbus_get_phy_controller(pc_phandle);
    109 			if (pc == NULL)
    110 				goto done;
    111 			phy_priv = pc->pc_funcs->acquire(pc->pc_dev,
    112 			    phy_cells > 0 ? &p[1] : NULL, phy_cells * 4);
    113 			if (phy_priv) {
    114 				phy = kmem_alloc(sizeof(*phy), KM_SLEEP);
    115 				phy->phy_pc = pc;
    116 				phy->phy_priv = phy_priv;
    117 			}
    118 			break;
    119 		}
    120 		resid -= (phy_cells + 1) * 4;
    121 		p += phy_cells + 1;
    122 	}
    123 
    124 done:
    125 	if (phys)
    126 		kmem_free(phys, len);
    127 
    128 	return phy;
    129 }
    130 
    131 struct fdtbus_phy *
    132 fdtbus_phy_get(int phandle, const char *phyname)
    133 {
    134 	struct fdtbus_phy *phy = NULL;
    135 	char *phy_names = NULL;
    136 	const char *p;
    137 	u_int index;
    138 	int len, resid;
    139 
    140 	len = OF_getproplen(phandle, "phy-names");
    141 	if (len <= 0)
    142 		return NULL;
    143 
    144 	phy_names = kmem_alloc(len, KM_SLEEP);
    145 	if (OF_getprop(phandle, "phy-names", phy_names, len) != len) {
    146 		kmem_free(phy_names, len);
    147 		return NULL;
    148 	}
    149 
    150 	p = phy_names;
    151 	for (index = 0, resid = len; resid > 0; index++) {
    152 		if (strcmp(p, phyname) == 0) {
    153 			phy = fdtbus_phy_get_index(phandle, index);
    154 			break;
    155 		}
    156 		resid -= strlen(p);
    157 		p += strlen(p) + 1;
    158 	}
    159 
    160 	if (phy_names)
    161 		kmem_free(phy_names, len);
    162 
    163 	return phy;
    164 }
    165 
    166 void
    167 fdtbus_phy_put(struct fdtbus_phy *phy)
    168 {
    169 	struct fdtbus_phy_controller *pc = phy->phy_pc;
    170 
    171 	pc->pc_funcs->release(pc->pc_dev, phy->phy_priv);
    172 	kmem_free(phy, sizeof(*phy));
    173 }
    174 
    175 int
    176 fdtbus_phy_enable(struct fdtbus_phy *phy, bool enable)
    177 {
    178 	struct fdtbus_phy_controller *pc = phy->phy_pc;
    179 
    180 	return pc->pc_funcs->enable(pc->pc_dev, phy->phy_priv, enable);
    181 }
    182