1 /* $NetBSD: fdt_phy.c,v 1.1 2017/06/29 17:04:17 jmcneill 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 1.1 2017/06/29 17:04:17 jmcneill Exp $"); 31 32 #include <sys/param.h> 33 #include <sys/bus.h> 34 #include <sys/kmem.h> 35 36 #include <libfdt.h> 37 #include <dev/fdt/fdtvar.h> 38 39 struct fdtbus_phy_controller { 40 device_t pc_dev; 41 int pc_phandle; 42 const struct fdtbus_phy_controller_func *pc_funcs; 43 44 struct fdtbus_phy_controller *pc_next; 45 }; 46 47 static struct fdtbus_phy_controller *fdtbus_pc = NULL; 48 49 int 50 fdtbus_register_phy_controller(device_t dev, int phandle, 51 const struct fdtbus_phy_controller_func *funcs) 52 { 53 struct fdtbus_phy_controller *pc; 54 55 pc = kmem_alloc(sizeof(*pc), KM_SLEEP); 56 pc->pc_dev = dev; 57 pc->pc_phandle = phandle; 58 pc->pc_funcs = funcs; 59 60 pc->pc_next = fdtbus_pc; 61 fdtbus_pc = pc; 62 63 return 0; 64 } 65 66 static struct fdtbus_phy_controller * 67 fdtbus_get_phy_controller(int phandle) 68 { 69 struct fdtbus_phy_controller *pc; 70 71 for (pc = fdtbus_pc; pc; pc = pc->pc_next) { 72 if (pc->pc_phandle == phandle) { 73 return pc; 74 } 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