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      1 /* $NetBSD: fdt_phy.c,v 1.6 2019/10/30 21:37:36 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 1.6 2019/10/30 21:37:36 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 		if (p[0] == 0) {
    104 			phy_cells = 0;
    105 			goto next;
    106 		}
    107 		const int pc_phandle =
    108 		    fdtbus_get_phandle_from_native(be32toh(p[0]));
    109 		if (of_getprop_uint32(pc_phandle, "#phy-cells", &phy_cells))
    110 			break;
    111 		if (n == index) {
    112 			pc = fdtbus_get_phy_controller(pc_phandle);
    113 			if (pc == NULL)
    114 				goto done;
    115 			phy_priv = pc->pc_funcs->acquire(pc->pc_dev,
    116 			    phy_cells > 0 ? &p[1] : NULL, phy_cells * 4);
    117 			if (phy_priv) {
    118 				phy = kmem_alloc(sizeof(*phy), KM_SLEEP);
    119 				phy->phy_pc = pc;
    120 				phy->phy_priv = phy_priv;
    121 			}
    122 			break;
    123 		}
    124 next:
    125 		resid -= (phy_cells + 1) * 4;
    126 		p += phy_cells + 1;
    127 	}
    128 
    129 done:
    130 	if (phys)
    131 		kmem_free(phys, len);
    132 
    133 	return phy;
    134 }
    135 
    136 struct fdtbus_phy *
    137 fdtbus_phy_get(int phandle, const char *phyname)
    138 {
    139 	u_int index;
    140 	int err;
    141 
    142 	err = fdtbus_get_index(phandle, "phy-names", phyname, &index);
    143 	if (err != 0)
    144 		return NULL;
    145 
    146 	return fdtbus_phy_get_index(phandle, index);
    147 }
    148 
    149 void
    150 fdtbus_phy_put(struct fdtbus_phy *phy)
    151 {
    152 	struct fdtbus_phy_controller *pc = phy->phy_pc;
    153 
    154 	pc->pc_funcs->release(pc->pc_dev, phy->phy_priv);
    155 	kmem_free(phy, sizeof(*phy));
    156 }
    157 
    158 device_t
    159 fdtbus_phy_device(struct fdtbus_phy *phy)
    160 {
    161 	return phy->phy_pc->pc_dev;
    162 }
    163 
    164 int
    165 fdtbus_phy_enable(struct fdtbus_phy *phy, bool enable)
    166 {
    167 	struct fdtbus_phy_controller *pc = phy->phy_pc;
    168 
    169 	return pc->pc_funcs->enable(pc->pc_dev, phy->phy_priv, enable);
    170 }
    171