1 /*- 2 * Copyright (c) 2019 Juniper Networks, Inc. 3 * Copyright (c) 2019 Semihalf. 4 * All rights reserved. 5 * 6 * Redistribution and use in source and binary forms, with or without 7 * modification, are permitted provided that the following conditions 8 * are met: 9 * 1. Redistributions of source code must retain the above copyright 10 * notice, this list of conditions and the following disclaimer. 11 * 2. Redistributions in binary form must reproduce the above copyright 12 * notice, this list of conditions and the following disclaimer in the 13 * documentation and/or other materials provided with the distribution. 14 * 15 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR 16 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED 17 * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE 18 * DISCLAIMED. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, 19 * INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES 20 * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR 21 * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 22 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, 23 * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN 24 * ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 25 * POSSIBILITY OF SUCH DAMAGE. 26 */ 27 28 #include <sys/cdefs.h> 29 __FBSDID("$FreeBSD$"); 30 31 #include <sys/param.h> 32 #include <sys/bus.h> 33 #include <sys/kernel.h> 34 #include <sys/module.h> 35 #include <sys/rman.h> 36 #include <sys/systm.h> 37 38 #include <dev/fdt/simplebus.h> 39 #include <dev/ofw/ofw_bus_subr.h> 40 #include <dev/ofw/ofw_bus.h> 41 42 #include <machine/bus.h> 43 #include <machine/resource.h> 44 45 #include "mdio_if.h" 46 47 MALLOC_DEFINE(M_BRCM_IPROC_NEXUS, "Broadcom IPROC MDIO NEXUS", 48 "Broadcom IPROC MDIO NEXUS dynamic memory"); 49 50 struct brcm_mdionexus_softc { 51 struct simplebus_softc simplebus_sc; 52 uint32_t mux_id; 53 }; 54 55 /* OFW bus interface */ 56 struct brcm_mdionexus_ofw_devinfo { 57 struct ofw_bus_devinfo di_dinfo; 58 struct resource_list di_rl; 59 }; 60 61 static device_probe_t brcm_mdionexus_fdt_probe; 62 static device_attach_t brcm_mdionexus_fdt_attach; 63 64 static const struct ofw_bus_devinfo * brcm_mdionexus_ofw_get_devinfo(device_t, 65 device_t); 66 static int brcm_mdionexus_mdio_readreg(device_t, int, int); 67 static int brcm_mdionexus_mdio_writereg(device_t, int, int, int); 68 69 static device_method_t brcm_mdionexus_fdt_methods[] = { 70 /* Device interface */ 71 DEVMETHOD(device_probe, brcm_mdionexus_fdt_probe), 72 DEVMETHOD(device_attach, brcm_mdionexus_fdt_attach), 73 74 /* Bus interface */ 75 DEVMETHOD(bus_alloc_resource, bus_generic_alloc_resource), 76 DEVMETHOD(bus_release_resource, bus_generic_release_resource), 77 DEVMETHOD(bus_activate_resource, bus_generic_activate_resource), 78 79 /* ofw_bus interface */ 80 DEVMETHOD(ofw_bus_get_devinfo, brcm_mdionexus_ofw_get_devinfo), 81 DEVMETHOD(ofw_bus_get_compat, ofw_bus_gen_get_compat), 82 DEVMETHOD(ofw_bus_get_model, ofw_bus_gen_get_model), 83 DEVMETHOD(ofw_bus_get_name, ofw_bus_gen_get_name), 84 DEVMETHOD(ofw_bus_get_node, ofw_bus_gen_get_node), 85 DEVMETHOD(ofw_bus_get_type, ofw_bus_gen_get_type), 86 87 /* MDIO interface */ 88 /* MDIO interface */ 89 DEVMETHOD(mdio_readreg, brcm_mdionexus_mdio_readreg), 90 DEVMETHOD(mdio_writereg, brcm_mdionexus_mdio_writereg), 91 92 DEVMETHOD_END 93 }; 94 95 DEFINE_CLASS_0(brcm_mdionexus, brcm_mdionexus_fdt_driver, brcm_mdionexus_fdt_methods, 96 sizeof(struct brcm_mdionexus_softc)); 97 98 static devclass_t brcm_mdionexus_fdt_devclass; 99 100 static driver_t brcm_mdionexus_driver = { 101 "brcm_mdionexus", 102 brcm_mdionexus_fdt_methods, 103 sizeof(struct brcm_mdionexus_softc) 104 }; 105 EARLY_DRIVER_MODULE(brcm_mdionexus, brcm_iproc_mdio, brcm_mdionexus_driver, 106 brcm_mdionexus_fdt_devclass, NULL, NULL, BUS_PASS_BUS + BUS_PASS_ORDER_MIDDLE); 107 108 static int brcm_mdionexus_ofw_bus_attach(device_t); 109 110 static int 111 brcm_mdionexus_mdio_readreg(device_t dev, int phy, int reg) 112 { 113 struct brcm_mdionexus_softc *sc; 114 115 sc = device_get_softc(dev); 116 117 return (MDIO_READREG_MUX(device_get_parent(dev), 118 sc->mux_id, phy, reg)); 119 } 120 121 static int 122 brcm_mdionexus_mdio_writereg(device_t dev, int phy, int reg, int val) 123 { 124 struct brcm_mdionexus_softc *sc; 125 126 sc = device_get_softc(dev); 127 128 return (MDIO_WRITEREG_MUX(device_get_parent(dev), 129 sc->mux_id, phy, reg, val)); 130 } 131 132 static __inline void 133 get_addr_size_cells(phandle_t node, pcell_t *addr_cells, pcell_t *size_cells) 134 { 135 136 *addr_cells = 2; 137 /* Find address cells if present */ 138 OF_getencprop(node, "#address-cells", addr_cells, sizeof(*addr_cells)); 139 140 *size_cells = 2; 141 /* Find size cells if present */ 142 OF_getencprop(node, "#size-cells", size_cells, sizeof(*size_cells)); 143 } 144 145 static int 146 brcm_mdionexus_fdt_probe(device_t dev) 147 { 148 149 if (!ofw_bus_status_okay(dev)) 150 return (ENXIO); 151 device_set_desc(dev, "Broadcom MDIO nexus"); 152 return (BUS_PROBE_SPECIFIC); 153 } 154 155 static int 156 brcm_mdionexus_fdt_attach(device_t dev) 157 { 158 struct brcm_mdionexus_softc *sc; 159 int err; 160 pcell_t addr_cells, size_cells, buf[2]; 161 phandle_t node; 162 163 sc = device_get_softc(dev); 164 165 node = ofw_bus_get_node(dev); 166 get_addr_size_cells(node, &addr_cells, &size_cells); 167 if ((addr_cells != 1) || (size_cells != 0)) { 168 device_printf(dev, "Only addr_cells=1 and size_cells=0 are supported\n"); 169 return (EINVAL); 170 } 171 172 if (OF_getencprop(node, "reg", buf, sizeof(pcell_t)) < 0) 173 return (ENXIO); 174 175 sc->mux_id = buf[0]; 176 177 err = brcm_mdionexus_ofw_bus_attach(dev); 178 if (err != 0) 179 return (err); 180 181 return (bus_generic_attach(dev)); 182 } 183 184 static const struct ofw_bus_devinfo * 185 brcm_mdionexus_ofw_get_devinfo(device_t bus __unused, device_t child) 186 { 187 struct brcm_mdionexus_ofw_devinfo *di; 188 189 di = device_get_ivars(child); 190 return (&di->di_dinfo); 191 } 192 193 static int 194 brcm_mdionexus_ofw_bus_attach(device_t dev) 195 { 196 struct simplebus_softc *sc; 197 struct brcm_mdionexus_ofw_devinfo *di; 198 device_t child; 199 phandle_t parent, node; 200 201 parent = ofw_bus_get_node(dev); 202 simplebus_init(dev, parent); 203 204 sc = (struct simplebus_softc *)device_get_softc(dev); 205 206 /* Iterate through all bus subordinates */ 207 for (node = OF_child(parent); node > 0; node = OF_peer(node)) { 208 /* Allocate and populate devinfo. */ 209 di = malloc(sizeof(*di), M_BRCM_IPROC_NEXUS, M_WAITOK | M_ZERO); 210 if (ofw_bus_gen_setup_devinfo(&di->di_dinfo, node) != 0) { 211 free(di, M_BRCM_IPROC_NEXUS); 212 continue; 213 } 214 215 /* Initialize and populate resource list. */ 216 resource_list_init(&di->di_rl); 217 ofw_bus_reg_to_rl(dev, node, sc->acells, sc->scells, 218 &di->di_rl); 219 ofw_bus_intr_to_rl(dev, node, &di->di_rl, NULL); 220 221 /* Add newbus device for this FDT node */ 222 child = device_add_child(dev, NULL, -1); 223 if (child == NULL) { 224 resource_list_free(&di->di_rl); 225 ofw_bus_gen_destroy_devinfo(&di->di_dinfo); 226 free(di, M_BRCM_IPROC_NEXUS); 227 continue; 228 } 229 230 device_set_ivars(child, di); 231 } 232 233 return (0); 234 } 235