1 /*- 2 * SPDX-License-Identifier: BSD-2-Clause 3 * 4 * Copyright (c) 2018 Rubicon Communications, LLC (Netgate) 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 AND CONTRIBUTORS ``AS IS'' AND 16 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 17 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 18 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 19 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 20 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 21 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 22 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 23 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 24 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 25 * SUCH DAMAGE. 26 * 27 */ 28 29 #include <sys/param.h> 30 #include <sys/systm.h> 31 #include <sys/bus.h> 32 #include <sys/kernel.h> 33 #include <sys/lock.h> 34 #include <sys/module.h> 35 #include <sys/mutex.h> 36 #include <sys/rman.h> 37 38 #include <machine/bus.h> 39 40 #include <dev/fdt/simplebus.h> 41 42 #include <dev/ofw/ofw_bus.h> 43 #include <dev/ofw/ofw_bus_subr.h> 44 45 #include <dev/fdt/simple_mfd.h> 46 47 device_t simple_mfd_add_device(device_t dev, phandle_t node, u_int order, 48 const char *name, int unit, struct simplebus_devinfo *di); 49 struct simplebus_devinfo *simple_mfd_setup_dinfo(device_t dev, phandle_t node, 50 struct simplebus_devinfo *di); 51 52 #include "syscon_if.h" 53 #include <dev/syscon/syscon.h> 54 55 MALLOC_DECLARE(M_SYSCON); 56 57 static uint32_t simple_mfd_syscon_read_4(struct syscon *syscon, 58 bus_size_t offset); 59 static int simple_mfd_syscon_write_4(struct syscon *syscon, bus_size_t offset, 60 uint32_t val); 61 static int simple_mfd_syscon_modify_4(struct syscon *syscon, bus_size_t offset, 62 uint32_t clear_bits, uint32_t set_bits); 63 64 #define SYSCON_LOCK(_sc) mtx_lock_spin(&(_sc)->mtx) 65 #define SYSCON_UNLOCK(_sc) mtx_unlock_spin(&(_sc)->mtx) 66 #define SYSCON_LOCK_INIT(_sc) mtx_init(&(_sc)->mtx, \ 67 device_get_nameunit((_sc)->dev), "syscon", MTX_SPIN) 68 #define SYSCON_LOCK_DESTROY(_sc) mtx_destroy(&(_sc)->mtx); 69 #define SYSCON_ASSERT_LOCKED(_sc) mtx_assert(&(_sc)->mtx, MA_OWNED); 70 #define SYSCON_ASSERT_UNLOCKED(_sc) mtx_assert(&(_sc)->mtx, MA_NOTOWNED); 71 72 static syscon_method_t simple_mfd_syscon_methods[] = { 73 SYSCONMETHOD(syscon_unlocked_read_4, simple_mfd_syscon_read_4), 74 SYSCONMETHOD(syscon_unlocked_write_4, simple_mfd_syscon_write_4), 75 SYSCONMETHOD(syscon_unlocked_modify_4, simple_mfd_syscon_modify_4), 76 77 SYSCONMETHOD_END 78 }; 79 DEFINE_CLASS_1(simple_mfd_syscon, simple_mfd_syscon_class, 80 simple_mfd_syscon_methods, 0, syscon_class); 81 82 static uint32_t 83 simple_mfd_syscon_read_4(struct syscon *syscon, bus_size_t offset) 84 { 85 struct simple_mfd_softc *sc; 86 uint32_t val; 87 88 sc = device_get_softc(syscon->pdev); 89 SYSCON_ASSERT_LOCKED(sc); 90 val = bus_read_4(sc->mem_res, offset); 91 return (val); 92 } 93 94 static int 95 simple_mfd_syscon_write_4(struct syscon *syscon, bus_size_t offset, 96 uint32_t val) 97 { 98 struct simple_mfd_softc *sc; 99 100 sc = device_get_softc(syscon->pdev); 101 SYSCON_ASSERT_LOCKED(sc); 102 bus_write_4(sc->mem_res, offset, val); 103 return (0); 104 } 105 106 static int 107 simple_mfd_syscon_modify_4(struct syscon *syscon, bus_size_t offset, 108 uint32_t clear_bits, uint32_t set_bits) 109 { 110 struct simple_mfd_softc *sc; 111 uint32_t val; 112 113 sc = device_get_softc(syscon->pdev); 114 SYSCON_ASSERT_LOCKED(sc); 115 val = bus_read_4(sc->mem_res, offset); 116 val &= ~clear_bits; 117 val |= set_bits; 118 bus_write_4(sc->mem_res, offset, val); 119 return (0); 120 } 121 122 static int 123 simple_mfd_syscon_get_handle(device_t dev, struct syscon **syscon) 124 { 125 struct simple_mfd_softc *sc; 126 127 sc = device_get_softc(dev); 128 *syscon = sc->syscon; 129 if (*syscon == NULL) 130 return (ENODEV); 131 return (0); 132 } 133 134 static void 135 simple_mfd_syscon_lock(device_t dev) 136 { 137 struct simple_mfd_softc *sc; 138 139 sc = device_get_softc(dev); 140 SYSCON_LOCK(sc); 141 } 142 143 static void 144 simple_mfd_syscon_unlock(device_t dev) 145 { 146 struct simple_mfd_softc *sc; 147 148 sc = device_get_softc(dev); 149 SYSCON_UNLOCK(sc); 150 } 151 152 static int 153 simple_mfd_probe(device_t dev) 154 { 155 if (!ofw_bus_status_okay(dev)) 156 return (ENXIO); 157 if (!ofw_bus_is_compatible(dev, "simple-mfd")) 158 return (ENXIO); 159 160 device_set_desc(dev, "Simple MFD (Multi-Functions Device)"); 161 162 return (BUS_PROBE_GENERIC); 163 } 164 165 static int 166 simple_mfd_attach(device_t dev) 167 { 168 struct simple_mfd_softc *sc; 169 int rid, rv; 170 171 sc = device_get_softc(dev); 172 173 sc->dev = dev; 174 rid = 0; 175 176 rv = simplebus_attach_impl(dev, SB_FLAG_NO_RANGES, 0); 177 if (rv != 0) 178 return (rv); 179 180 if (ofw_bus_is_compatible(dev, "syscon")) { 181 sc->mem_res = bus_alloc_resource_any(dev, SYS_RES_MEMORY, &rid, 182 RF_ACTIVE | RF_SHAREABLE); 183 if (sc->mem_res == NULL) { 184 device_printf(dev, 185 "Cannot allocate memory resource\n"); 186 return (ENXIO); 187 } 188 189 SYSCON_LOCK_INIT(sc); 190 sc->syscon = syscon_create_ofw_node(dev, 191 &simple_mfd_syscon_class, ofw_bus_get_node(dev)); 192 if (sc->syscon == NULL) { 193 device_printf(dev, 194 "Failed to create/register syscon\n"); 195 return (ENXIO); 196 } 197 } 198 bus_attach_children(dev); 199 return (0); 200 } 201 202 static int 203 simple_mfd_detach(device_t dev) 204 { 205 struct simple_mfd_softc *sc; 206 207 sc = device_get_softc(dev); 208 if (ofw_bus_is_compatible(dev, "syscon")) { 209 if (sc->syscon != NULL) { 210 syscon_unregister(sc->syscon); 211 free(sc->syscon, M_SYSCON); 212 } 213 214 SYSCON_LOCK_DESTROY(sc); 215 216 if (sc->mem_res != NULL) 217 bus_release_resource(dev, SYS_RES_MEMORY, 0, 218 sc->mem_res); 219 } 220 return (0); 221 } 222 223 struct simplebus_devinfo * 224 simple_mfd_setup_dinfo(device_t dev, phandle_t node, 225 struct simplebus_devinfo *di) 226 { 227 struct simplebus_softc *sc; 228 struct simplebus_devinfo *ndi; 229 230 sc = device_get_softc_class(dev, &simplebus_driver); 231 if (di == NULL) 232 ndi = malloc(sizeof(*ndi), M_DEVBUF, M_WAITOK | M_ZERO); 233 else 234 ndi = di; 235 if (ofw_bus_gen_setup_devinfo(&ndi->obdinfo, node) != 0) { 236 if (di == NULL) 237 free(ndi, M_DEVBUF); 238 return (NULL); 239 } 240 241 /* reg resources is from the parent but interrupts is on the node itself */ 242 resource_list_init(&ndi->rl); 243 ofw_bus_reg_to_rl(dev, OF_parent(node), sc->acells, sc->scells, &ndi->rl); 244 ofw_bus_intr_to_rl(dev, node, &ndi->rl, NULL); 245 246 return (ndi); 247 } 248 249 device_t 250 simple_mfd_add_device(device_t dev, phandle_t node, u_int order, 251 const char *name, int unit, struct simplebus_devinfo *di) 252 { 253 struct simplebus_devinfo *ndi; 254 device_t cdev; 255 256 if ((ndi = simple_mfd_setup_dinfo(dev, node, di)) == NULL) 257 return (NULL); 258 cdev = device_add_child_ordered(dev, order, name, unit); 259 if (cdev == NULL) { 260 device_printf(dev, "<%s>: device_add_child failed\n", 261 ndi->obdinfo.obd_name); 262 resource_list_free(&ndi->rl); 263 ofw_bus_gen_destroy_devinfo(&ndi->obdinfo); 264 if (di == NULL) 265 free(ndi, M_DEVBUF); 266 return (NULL); 267 } 268 device_set_ivars(cdev, ndi); 269 270 return(cdev); 271 } 272 273 static device_method_t simple_mfd_methods[] = { 274 /* syscon interface */ 275 DEVMETHOD(syscon_get_handle, simple_mfd_syscon_get_handle), 276 DEVMETHOD(syscon_device_lock, simple_mfd_syscon_lock), 277 DEVMETHOD(syscon_device_unlock, simple_mfd_syscon_unlock), 278 279 /* Device interface */ 280 DEVMETHOD(device_probe, simple_mfd_probe), 281 DEVMETHOD(device_attach, simple_mfd_attach), 282 DEVMETHOD(device_detach, simple_mfd_detach), 283 284 DEVMETHOD_END 285 }; 286 287 DEFINE_CLASS_1(simple_mfd, simple_mfd_driver, simple_mfd_methods, 288 sizeof(struct simple_mfd_softc), simplebus_driver); 289 290 EARLY_DRIVER_MODULE(simple_mfd, simplebus, simple_mfd_driver, 0, 0, 291 BUS_PASS_BUS + BUS_PASS_ORDER_LATE); 292 MODULE_VERSION(simple_mfd, 1); 293