1 /*- 2 * SPDX-License-Identifier: BSD-2-Clause-FreeBSD 3 * 4 * Copyright (c) 2022 Adrian Chadd <adrian@FreeBSD.org> 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 unmodified, this list of conditions, and the following 11 * 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 AND CONTRIBUTORS ``AS IS'' AND 17 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 18 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 19 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 20 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 21 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 22 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 23 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 24 * LIABILITY, 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 /* 30 * This is the MDIO controller for the IPQ4018/IPQ4019. 31 */ 32 33 #include <sys/cdefs.h> 34 35 #include <sys/param.h> 36 #include <sys/systm.h> 37 #include <sys/bus.h> 38 39 #include <sys/kernel.h> 40 #include <sys/module.h> 41 #include <sys/rman.h> 42 #include <sys/lock.h> 43 #include <sys/malloc.h> 44 #include <sys/mutex.h> 45 #include <sys/gpio.h> 46 47 #include <machine/bus.h> 48 #include <machine/resource.h> 49 #include <dev/gpio/gpiobusvar.h> 50 51 #include <dev/fdt/fdt_common.h> 52 #include <dev/ofw/ofw_bus.h> 53 #include <dev/ofw/ofw_bus_subr.h> 54 55 #include "mdio_if.h" 56 57 #include <dev/qcom_mdio/qcom_mdio_ipq4018_var.h> 58 #include <dev/qcom_mdio/qcom_mdio_ipq4018_reg.h> 59 60 #include <dev/qcom_mdio/qcom_mdio_debug.h> 61 62 static int 63 qcom_mdio_ipq4018_probe(device_t dev) 64 { 65 66 if (! ofw_bus_status_okay(dev)) 67 return (ENXIO); 68 69 if (ofw_bus_is_compatible(dev, "qcom,ipq4019-mdio") == 0) 70 return (ENXIO); 71 72 device_set_desc(dev, 73 "Qualcomm Atheros IPQ4018/IPQ4019 MDIO driver"); 74 return (0); 75 } 76 77 static int 78 qcom_mdio_ipq4018_detach(device_t dev) 79 { 80 struct qcom_mdio_ipq4018_softc *sc = device_get_softc(dev); 81 82 if (sc->sc_mem_res != NULL) 83 bus_release_resource(dev, SYS_RES_MEMORY, sc->sc_mem_rid, 84 sc->sc_mem_res); 85 mtx_destroy(&sc->sc_mtx); 86 87 return (0); 88 } 89 90 static void 91 qcom_mdio_sysctl_attach(struct qcom_mdio_ipq4018_softc *sc) 92 { 93 struct sysctl_ctx_list *ctx = device_get_sysctl_ctx(sc->sc_dev); 94 struct sysctl_oid *tree = device_get_sysctl_tree(sc->sc_dev); 95 96 SYSCTL_ADD_UINT(ctx, SYSCTL_CHILDREN(tree), OID_AUTO, 97 "debug", CTLFLAG_RW, &sc->sc_debug, 0, 98 "control debugging printfs"); 99 } 100 101 static int 102 qcom_mdio_ipq4018_attach(device_t dev) 103 { 104 phandle_t node; 105 struct qcom_mdio_ipq4018_softc *sc = device_get_softc(dev); 106 int error = 0; 107 108 node = ofw_bus_get_node(dev); 109 110 sc->sc_dev = dev; 111 sc->sc_debug = 0; 112 mtx_init(&sc->sc_mtx, device_get_nameunit(dev), NULL, MTX_DEF); 113 114 /* 115 * Map the MDIO memory region. 116 */ 117 sc->sc_mem_rid = 0; 118 sc->sc_mem_res = bus_alloc_resource_any(dev, SYS_RES_MEMORY, 119 &sc->sc_mem_rid, RF_ACTIVE); 120 if (sc->sc_mem_res == NULL) { 121 error = ENXIO; 122 device_printf(dev, "%s: failed to map device memory\n", 123 __func__); 124 goto error; 125 } 126 sc->sc_mem_res_size = (size_t) bus_get_resource_count(dev, 127 SYS_RES_MEMORY, sc->sc_mem_rid); 128 if (sc->sc_mem_res_size == 0) { 129 error = ENXIO; 130 device_printf(dev, "%s: failed to get device memory size\n", 131 __func__); 132 goto error; 133 134 } 135 136 qcom_mdio_sysctl_attach(sc); 137 138 OF_device_register_xref(OF_xref_from_node(node), dev); 139 140 return (0); 141 error: 142 if (sc->sc_mem_res != NULL) 143 bus_release_resource(dev, SYS_RES_MEMORY, sc->sc_mem_rid, 144 sc->sc_mem_res); 145 146 mtx_destroy(&sc->sc_mtx); 147 return (error); 148 } 149 150 /* 151 * Wait for the BUSY flag to become zero. 152 * 153 * This has to happen before every MDIO transfer. 154 * 155 * Returns 0 if OK, error if error/timed out. 156 */ 157 static int 158 qcom_mdio_ipq4018_wait(struct qcom_mdio_ipq4018_softc *sc) 159 { 160 int i; 161 uint32_t reg; 162 163 MDIO_LOCK_ASSERT(sc); 164 165 for (i = 0; i < QCOM_IPQ4018_MDIO_SLEEP_COUNT; i++) { 166 MDIO_BARRIER_READ(sc); 167 168 reg = MDIO_READ(sc, QCOM_IPQ4018_MDIO_REG_CMD); 169 if ((reg & QCOM_IPQ4018_MDIO_REG_CMD_ACCESS_BUSY) == 0) 170 return (0); 171 DELAY(QCOM_IPQ4018_MDIO_SLEEP); 172 } 173 device_printf(sc->sc_dev, "%s: warning: timeout waiting for bus\n", 174 __func__); 175 return (ETIMEDOUT); 176 } 177 178 static void 179 qcom_mdio_ipq4018_set_phy_reg_addr(struct qcom_mdio_ipq4018_softc *sc, 180 int phy, int reg) 181 { 182 183 MDIO_LOCK_ASSERT(sc); 184 185 MDIO_WRITE(sc, QCOM_IPQ4018_MDIO_REG_ADDR, 186 ((phy & 0xff) << 8) | (reg & 0xff)); 187 MDIO_BARRIER_WRITE(sc); 188 } 189 190 static int 191 qcom_mdio_ipq4018_readreg(device_t dev, int phy, int reg) 192 { 193 struct qcom_mdio_ipq4018_softc *sc = device_get_softc(dev); 194 uint32_t ret; 195 196 QCOM_MDIO_DPRINTF(sc, QCOM_MDIO_DEBUG_REG_READ, 197 "%s: called; phy=0x%x reg=0x%x\n", 198 __func__, phy, reg); 199 200 MDIO_LOCK(sc); 201 if (qcom_mdio_ipq4018_wait(sc) != 0) { 202 MDIO_UNLOCK(sc); 203 return (-1); 204 } 205 206 /* Set phy/reg values */ 207 qcom_mdio_ipq4018_set_phy_reg_addr(sc, phy, reg); 208 209 /* Issue read command */ 210 MDIO_WRITE(sc, QCOM_IPQ4018_MDIO_REG_CMD, 211 QCOM_IPQ4018_MDIO_REG_CMD_ACCESS_START | 212 QCOM_IPQ4018_MDIO_REG_CMD_ACCESS_CODE_READ); 213 MDIO_BARRIER_WRITE(sc); 214 215 /* Wait for completion */ 216 if (qcom_mdio_ipq4018_wait(sc) != 0) { 217 MDIO_UNLOCK(sc); 218 return (-1); 219 } 220 221 /* Fetch return register value */ 222 MDIO_BARRIER_READ(sc); 223 ret = MDIO_READ(sc, QCOM_IPQ4018_MDIO_REG_READ); 224 MDIO_UNLOCK(sc); 225 226 QCOM_MDIO_DPRINTF(sc, QCOM_MDIO_DEBUG_REG_READ, 227 "%s: -> 0x%x\n", __func__, ret); 228 229 return (ret); 230 } 231 232 static int 233 qcom_mdio_ipq4018_writereg(device_t dev, int phy, int reg, int value) 234 { 235 struct qcom_mdio_ipq4018_softc *sc = device_get_softc(dev); 236 237 QCOM_MDIO_DPRINTF(sc, QCOM_MDIO_DEBUG_REG_WRITE, 238 "%s: called; phy=0x%x reg=0x%x val=0x%x\n", 239 __func__, phy, reg, value); 240 241 MDIO_LOCK(sc); 242 if (qcom_mdio_ipq4018_wait(sc) != 0) { 243 MDIO_UNLOCK(sc); 244 return (-1); 245 } 246 247 /* Set phy/reg values */ 248 qcom_mdio_ipq4018_set_phy_reg_addr(sc, phy, reg); 249 250 /* Write command */ 251 MDIO_WRITE(sc, QCOM_IPQ4018_MDIO_REG_WRITE, value); 252 MDIO_BARRIER_WRITE(sc); 253 254 /* Issue write command */ 255 MDIO_WRITE(sc, QCOM_IPQ4018_MDIO_REG_CMD, 256 QCOM_IPQ4018_MDIO_REG_CMD_ACCESS_START | 257 QCOM_IPQ4018_MDIO_REG_CMD_ACCESS_CODE_WRITE); 258 MDIO_BARRIER_WRITE(sc); 259 260 /* Wait for completion */ 261 if (qcom_mdio_ipq4018_wait(sc) != 0) { 262 MDIO_UNLOCK(sc); 263 return (-1); 264 } 265 MDIO_UNLOCK(sc); 266 267 return (0); 268 } 269 270 static device_method_t qcom_mdio_ipq4018_methods[] = { 271 /* Driver */ 272 DEVMETHOD(device_probe, qcom_mdio_ipq4018_probe), 273 DEVMETHOD(device_attach, qcom_mdio_ipq4018_attach), 274 DEVMETHOD(device_detach, qcom_mdio_ipq4018_detach), 275 276 /* MDIO interface */ 277 DEVMETHOD(mdio_readreg, qcom_mdio_ipq4018_readreg), 278 DEVMETHOD(mdio_writereg, qcom_mdio_ipq4018_writereg), 279 280 {0, 0}, 281 }; 282 283 static driver_t qcom_mdio_ipq4018_driver = { 284 "mdio", 285 qcom_mdio_ipq4018_methods, 286 sizeof(struct qcom_mdio_ipq4018_softc), 287 }; 288 static devclass_t qcom_mdio_ipq4018_devclass; 289 290 EARLY_DRIVER_MODULE(qcom_mdio_ipq4018, simplebus, qcom_mdio_ipq4018_driver, 291 qcom_mdio_ipq4018_devclass, NULL, 0, 292 BUS_PASS_SUPPORTDEV + BUS_PASS_ORDER_LATE); 293 294 MODULE_DEPEND(qcom_mdio_ipq4018, ether, 1, 1, 1); 295 MODULE_DEPEND(qcom_mdio_ipq4018, mdio, 1, 1, 1); 296 MODULE_DEPEND(qcom_mdio_ipq4018, miibus, 1, 1, 1); 297 298 MODULE_VERSION(qcom_mdio_ipq4018, 1); 299