1 /* $NetBSD: fdt_phy.c,v 1.5 2019/02/27 16:56:00 jakllsch Exp $ */ 2 3 /*- 4 * Copyright (c) 2015-2017 Jared McNeill <jmcneill@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 1.5 2019/02/27 16:56:00 jakllsch 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 u_int index; 135 int err; 136 137 err = fdtbus_get_index(phandle, "phy-names", phyname, &index); 138 if (err != 0) 139 return NULL; 140 141 return fdtbus_phy_get_index(phandle, index); 142 } 143 144 void 145 fdtbus_phy_put(struct fdtbus_phy *phy) 146 { 147 struct fdtbus_phy_controller *pc = phy->phy_pc; 148 149 pc->pc_funcs->release(pc->pc_dev, phy->phy_priv); 150 kmem_free(phy, sizeof(*phy)); 151 } 152 153 device_t 154 fdtbus_phy_device(struct fdtbus_phy *phy) 155 { 156 return phy->phy_pc->pc_dev; 157 } 158 159 int 160 fdtbus_phy_enable(struct fdtbus_phy *phy, bool enable) 161 { 162 struct fdtbus_phy_controller *pc = phy->phy_pc; 163 164 return pc->pc_funcs->enable(pc->pc_dev, phy->phy_priv, enable); 165 } 166