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fdt_phy.c revision 1.1.12.2
      1  1.1.12.2    martin /* $NetBSD: fdt_phy.c,v 1.1.12.2 2020/04/13 08:04:19 martin Exp $ */
      2       1.1  jmcneill 
      3       1.1  jmcneill /*-
      4       1.1  jmcneill  * Copyright (c) 2015-2017 Jared McNeill <jmcneill (at) invisible.ca>
      5       1.1  jmcneill  * All rights reserved.
      6       1.1  jmcneill  *
      7       1.1  jmcneill  * Redistribution and use in source and binary forms, with or without
      8       1.1  jmcneill  * modification, are permitted provided that the following conditions
      9       1.1  jmcneill  * are met:
     10       1.1  jmcneill  * 1. Redistributions of source code must retain the above copyright
     11       1.1  jmcneill  *    notice, this list of conditions and the following disclaimer.
     12       1.1  jmcneill  * 2. Redistributions in binary form must reproduce the above copyright
     13       1.1  jmcneill  *    notice, this list of conditions and the following disclaimer in the
     14       1.1  jmcneill  *    documentation and/or other materials provided with the distribution.
     15       1.1  jmcneill  *
     16       1.1  jmcneill  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
     17       1.1  jmcneill  * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
     18       1.1  jmcneill  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
     19       1.1  jmcneill  * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
     20       1.1  jmcneill  * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
     21       1.1  jmcneill  * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
     22       1.1  jmcneill  * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
     23       1.1  jmcneill  * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
     24       1.1  jmcneill  * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
     25       1.1  jmcneill  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
     26       1.1  jmcneill  * SUCH DAMAGE.
     27       1.1  jmcneill  */
     28       1.1  jmcneill 
     29       1.1  jmcneill #include <sys/cdefs.h>
     30  1.1.12.2    martin __KERNEL_RCSID(0, "$NetBSD: fdt_phy.c,v 1.1.12.2 2020/04/13 08:04:19 martin Exp $");
     31       1.1  jmcneill 
     32       1.1  jmcneill #include <sys/param.h>
     33       1.1  jmcneill #include <sys/bus.h>
     34       1.1  jmcneill #include <sys/kmem.h>
     35  1.1.12.1  christos #include <sys/queue.h>
     36       1.1  jmcneill 
     37       1.1  jmcneill #include <libfdt.h>
     38       1.1  jmcneill #include <dev/fdt/fdtvar.h>
     39       1.1  jmcneill 
     40       1.1  jmcneill struct fdtbus_phy_controller {
     41       1.1  jmcneill 	device_t pc_dev;
     42       1.1  jmcneill 	int pc_phandle;
     43       1.1  jmcneill 	const struct fdtbus_phy_controller_func *pc_funcs;
     44       1.1  jmcneill 
     45  1.1.12.1  christos 	LIST_ENTRY(fdtbus_phy_controller) pc_next;
     46       1.1  jmcneill };
     47       1.1  jmcneill 
     48  1.1.12.1  christos static LIST_HEAD(, fdtbus_phy_controller) fdtbus_phy_controllers =
     49  1.1.12.1  christos     LIST_HEAD_INITIALIZER(fdtbus_phy_controllers);
     50       1.1  jmcneill 
     51       1.1  jmcneill int
     52       1.1  jmcneill fdtbus_register_phy_controller(device_t dev, int phandle,
     53       1.1  jmcneill     const struct fdtbus_phy_controller_func *funcs)
     54       1.1  jmcneill {
     55       1.1  jmcneill 	struct fdtbus_phy_controller *pc;
     56       1.1  jmcneill 
     57       1.1  jmcneill 	pc = kmem_alloc(sizeof(*pc), KM_SLEEP);
     58       1.1  jmcneill 	pc->pc_dev = dev;
     59       1.1  jmcneill 	pc->pc_phandle = phandle;
     60       1.1  jmcneill 	pc->pc_funcs = funcs;
     61       1.1  jmcneill 
     62  1.1.12.1  christos 	LIST_INSERT_HEAD(&fdtbus_phy_controllers, pc, pc_next);
     63       1.1  jmcneill 
     64       1.1  jmcneill 	return 0;
     65       1.1  jmcneill }
     66       1.1  jmcneill 
     67       1.1  jmcneill static struct fdtbus_phy_controller *
     68       1.1  jmcneill fdtbus_get_phy_controller(int phandle)
     69       1.1  jmcneill {
     70       1.1  jmcneill 	struct fdtbus_phy_controller *pc;
     71       1.1  jmcneill 
     72  1.1.12.1  christos 	LIST_FOREACH(pc, &fdtbus_phy_controllers, pc_next) {
     73  1.1.12.1  christos 		if (pc->pc_phandle == phandle)
     74       1.1  jmcneill 			return pc;
     75       1.1  jmcneill 	}
     76       1.1  jmcneill 
     77       1.1  jmcneill 	return NULL;
     78       1.1  jmcneill }
     79       1.1  jmcneill 
     80       1.1  jmcneill struct fdtbus_phy *
     81       1.1  jmcneill fdtbus_phy_get_index(int phandle, u_int index)
     82       1.1  jmcneill {
     83       1.1  jmcneill 	struct fdtbus_phy_controller *pc;
     84       1.1  jmcneill 	struct fdtbus_phy *phy = NULL;
     85       1.1  jmcneill 	void *phy_priv = NULL;
     86       1.1  jmcneill 	uint32_t *phys = NULL;
     87       1.1  jmcneill 	uint32_t *p;
     88       1.1  jmcneill 	u_int n, phy_cells;
     89       1.1  jmcneill 	int len, resid;
     90       1.1  jmcneill 
     91       1.1  jmcneill 	len = OF_getproplen(phandle, "phys");
     92       1.1  jmcneill 	if (len <= 0)
     93       1.1  jmcneill 		return NULL;
     94       1.1  jmcneill 
     95       1.1  jmcneill 	phys = kmem_alloc(len, KM_SLEEP);
     96       1.1  jmcneill 	if (OF_getprop(phandle, "phys", phys, len) != len) {
     97       1.1  jmcneill 		kmem_free(phys, len);
     98       1.1  jmcneill 		return NULL;
     99       1.1  jmcneill 	}
    100       1.1  jmcneill 
    101       1.1  jmcneill 	p = phys;
    102       1.1  jmcneill 	for (n = 0, resid = len; resid > 0; n++) {
    103  1.1.12.2    martin 		if (p[0] == 0) {
    104  1.1.12.2    martin 			phy_cells = 0;
    105  1.1.12.2    martin 			goto next;
    106  1.1.12.2    martin 		}
    107       1.1  jmcneill 		const int pc_phandle =
    108       1.1  jmcneill 		    fdtbus_get_phandle_from_native(be32toh(p[0]));
    109       1.1  jmcneill 		if (of_getprop_uint32(pc_phandle, "#phy-cells", &phy_cells))
    110       1.1  jmcneill 			break;
    111       1.1  jmcneill 		if (n == index) {
    112       1.1  jmcneill 			pc = fdtbus_get_phy_controller(pc_phandle);
    113       1.1  jmcneill 			if (pc == NULL)
    114       1.1  jmcneill 				goto done;
    115       1.1  jmcneill 			phy_priv = pc->pc_funcs->acquire(pc->pc_dev,
    116       1.1  jmcneill 			    phy_cells > 0 ? &p[1] : NULL, phy_cells * 4);
    117       1.1  jmcneill 			if (phy_priv) {
    118       1.1  jmcneill 				phy = kmem_alloc(sizeof(*phy), KM_SLEEP);
    119       1.1  jmcneill 				phy->phy_pc = pc;
    120       1.1  jmcneill 				phy->phy_priv = phy_priv;
    121       1.1  jmcneill 			}
    122       1.1  jmcneill 			break;
    123       1.1  jmcneill 		}
    124  1.1.12.2    martin next:
    125       1.1  jmcneill 		resid -= (phy_cells + 1) * 4;
    126       1.1  jmcneill 		p += phy_cells + 1;
    127       1.1  jmcneill 	}
    128       1.1  jmcneill 
    129       1.1  jmcneill done:
    130       1.1  jmcneill 	if (phys)
    131       1.1  jmcneill 		kmem_free(phys, len);
    132       1.1  jmcneill 
    133       1.1  jmcneill 	return phy;
    134       1.1  jmcneill }
    135       1.1  jmcneill 
    136       1.1  jmcneill struct fdtbus_phy *
    137       1.1  jmcneill fdtbus_phy_get(int phandle, const char *phyname)
    138       1.1  jmcneill {
    139       1.1  jmcneill 	u_int index;
    140  1.1.12.1  christos 	int err;
    141       1.1  jmcneill 
    142  1.1.12.1  christos 	err = fdtbus_get_index(phandle, "phy-names", phyname, &index);
    143  1.1.12.1  christos 	if (err != 0)
    144       1.1  jmcneill 		return NULL;
    145       1.1  jmcneill 
    146  1.1.12.1  christos 	return fdtbus_phy_get_index(phandle, index);
    147       1.1  jmcneill }
    148       1.1  jmcneill 
    149       1.1  jmcneill void
    150       1.1  jmcneill fdtbus_phy_put(struct fdtbus_phy *phy)
    151       1.1  jmcneill {
    152       1.1  jmcneill 	struct fdtbus_phy_controller *pc = phy->phy_pc;
    153       1.1  jmcneill 
    154       1.1  jmcneill 	pc->pc_funcs->release(pc->pc_dev, phy->phy_priv);
    155       1.1  jmcneill 	kmem_free(phy, sizeof(*phy));
    156       1.1  jmcneill }
    157       1.1  jmcneill 
    158  1.1.12.1  christos device_t
    159  1.1.12.1  christos fdtbus_phy_device(struct fdtbus_phy *phy)
    160  1.1.12.1  christos {
    161  1.1.12.1  christos 	return phy->phy_pc->pc_dev;
    162  1.1.12.1  christos }
    163  1.1.12.1  christos 
    164       1.1  jmcneill int
    165       1.1  jmcneill fdtbus_phy_enable(struct fdtbus_phy *phy, bool enable)
    166       1.1  jmcneill {
    167       1.1  jmcneill 	struct fdtbus_phy_controller *pc = phy->phy_pc;
    168       1.1  jmcneill 
    169       1.1  jmcneill 	return pc->pc_funcs->enable(pc->pc_dev, phy->phy_priv, enable);
    170       1.1  jmcneill }
    171