sni_i2c.c revision 1.4
1 /* $NetBSD: sni_i2c.c,v 1.4 2020/03/25 22:11:00 nisimura Exp $ */ 2 3 /*- 4 * Copyright (c) 2020 The NetBSD Foundation, Inc. 5 * All rights reserved. 6 * 7 * This code is derived from software contributed to The NetBSD Foundation 8 * by Tohru Nishimura. 9 * 10 * Redistribution and use in source and binary forms, with or without 11 * modification, are permitted provided that the following conditions 12 * are met: 13 * 1. Redistributions of source code must retain the above copyright 14 * notice, this list of conditions and the following disclaimer. 15 * 2. Redistributions in binary form must reproduce the above copyright 16 * notice, this list of conditions and the following disclaimer in the 17 * documentation and/or other materials provided with the distribution. 18 * 19 * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS 20 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED 21 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 22 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS 23 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 24 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 25 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 26 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 27 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 28 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 29 * POSSIBILITY OF SUCH DAMAGE. 30 */ 31 32 /* 33 * Socionext SC2A11 SynQuacer I2C driver 34 */ 35 36 #include <sys/cdefs.h> 37 __KERNEL_RCSID(0, "$NetBSD: sni_i2c.c,v 1.4 2020/03/25 22:11:00 nisimura Exp $"); 38 39 #include <sys/param.h> 40 #include <sys/bus.h> 41 #include <sys/intr.h> 42 #include <sys/device.h> 43 #include <sys/mutex.h> 44 #include <sys/condvar.h> 45 #include <sys/errno.h> 46 #include <sys/kernel.h> 47 #include <sys/systm.h> 48 49 #include <dev/i2c/i2cvar.h> 50 51 #include <dev/fdt/fdtvar.h> 52 #include <dev/acpi/acpireg.h> 53 #include <dev/acpi/acpivar.h> 54 #include <dev/acpi/acpi_intr.h> 55 56 static int sniiic_fdt_match(device_t, struct cfdata *, void *); 57 static void sniiic_fdt_attach(device_t, device_t, void *); 58 static int sniiic_acpi_match(device_t, struct cfdata *, void *); 59 static void sniiic_acpi_attach(device_t, device_t, void *); 60 61 struct sniiic_softc { 62 device_t sc_dev; 63 struct i2c_controller sc_ic; 64 device_t sc_i2cdev; 65 bus_space_tag_t sc_iot; 66 bus_space_handle_t sc_ioh; 67 bus_addr_t sc_iob; 68 bus_size_t sc_ios; 69 void *sc_ih; 70 kmutex_t sc_lock; 71 kmutex_t sc_mtx; 72 kcondvar_t sc_cv; 73 int sc_opflags; 74 bool sc_busy; 75 int sc_phandle; 76 }; 77 78 CFATTACH_DECL_NEW(sniiic_fdt, sizeof(struct sniiic_softc), 79 sniiic_fdt_match, sniiic_fdt_attach, NULL, NULL); 80 81 CFATTACH_DECL_NEW(sniiic_acpi, sizeof(struct sniiic_softc), 82 sniiic_acpi_match, sniiic_acpi_attach, NULL, NULL); 83 84 static int sni_i2c_acquire_bus(void *, int); 85 static void sni_i2c_release_bus(void *, int); 86 static int sni_i2c_exec(void *, i2c_op_t, i2c_addr_t, const void *, 87 size_t, void *, size_t, int); 88 89 static int sni_i2c_intr(void *); 90 static void sni_i2c_reset(struct sniiic_softc *); 91 static void sni_i2c_flush(struct sniiic_softc *); 92 93 static i2c_tag_t sni_i2c_get_tag(device_t); 94 static const struct fdtbus_i2c_controller_func sni_i2c_funcs = { 95 .get_tag = sni_i2c_get_tag, 96 }; 97 98 #define I2C_READ(sc, reg) \ 99 bus_space_read_4((sc)->sc_ioh,(sc)->sc_ioh,(reg)) 100 #define I2C_WRITE(sc, reg, val) \ 101 bus_space_write_4((sc)->sc_ioh,(sc)->sc_ioh,(reg),(val)) 102 103 static int 104 sniiic_fdt_match(device_t parent, struct cfdata *match, void *aux) 105 { 106 static const char * compatible[] = { 107 "socionext,synquacer-i2c", 108 NULL 109 }; 110 struct fdt_attach_args * const faa = aux; 111 112 return of_match_compatible(faa->faa_phandle, compatible); 113 } 114 115 static void 116 sniiic_fdt_attach(device_t parent, device_t self, void *aux) 117 { 118 struct sniiic_softc * const sc = device_private(self); 119 struct fdt_attach_args * const faa = aux; 120 prop_dictionary_t dict = device_properties(self); 121 const int phandle = faa->faa_phandle; 122 bus_space_handle_t ioh; 123 bus_addr_t addr; 124 bus_size_t size; 125 char intrstr[128]; 126 _Bool disable; 127 128 prop_dictionary_get_bool(dict, "disable", &disable); 129 if (disable) { 130 aprint_naive(": disabled\n"); 131 aprint_normal(": disabled\n"); 132 return; 133 } 134 if (fdtbus_get_reg(phandle, 0, &addr, &size) != 0 135 || bus_space_map(faa->faa_bst, addr, size, 0, &ioh) != 0) { 136 aprint_error(": unable to map device\n"); 137 return; 138 } 139 if (!fdtbus_intr_str(phandle, 0, intrstr, sizeof(intrstr))) { 140 aprint_error(": failed to decode interrupt\n"); 141 goto fail; 142 } 143 sc->sc_ih = fdtbus_intr_establish(phandle, 144 0, IPL_BIO, 0, sni_i2c_intr, sc); 145 if (sc->sc_ih == NULL) { 146 aprint_error_dev(self, "couldn't establish interrupt\n"); 147 goto fail; 148 } 149 150 aprint_naive("\n"); 151 aprint_normal_dev(self, ": Socionext I2C controller\n"); 152 aprint_normal_dev(self, ": interrupting on %s\n", intrstr); 153 154 sc->sc_dev = self; 155 sc->sc_iot = faa->faa_bst; 156 sc->sc_ioh = ioh; 157 sc->sc_iob = addr; 158 sc->sc_ios = size; 159 mutex_init(&sc->sc_lock, MUTEX_DEFAULT, IPL_NONE); 160 mutex_init(&sc->sc_mtx, MUTEX_DEFAULT, IPL_BIO); 161 cv_init(&sc->sc_cv, device_xname(self)); 162 163 iic_tag_init(&sc->sc_ic); 164 sc->sc_ic.ic_cookie = sc; 165 sc->sc_ic.ic_acquire_bus = sni_i2c_acquire_bus; 166 sc->sc_ic.ic_release_bus = sni_i2c_release_bus; 167 sc->sc_ic.ic_exec = sni_i2c_exec; 168 169 fdtbus_register_i2c_controller(self, phandle, &sni_i2c_funcs); 170 #if 0 171 fdtbus_attach_i2cbus(self, phandle, &sc->sc_ic, iicbus_print); 172 #endif 173 return; 174 fail: 175 bus_space_unmap(sc->sc_iot, sc->sc_ioh, sc->sc_ios); 176 return; 177 } 178 179 static int 180 sniiic_acpi_match(device_t parent, struct cfdata *match, void *aux) 181 { 182 static const char * compatible[] = { 183 "SCX0003", 184 NULL 185 }; 186 struct acpi_attach_args *aa = aux; 187 188 if (aa->aa_node->ad_type != ACPI_TYPE_DEVICE) 189 return 0; 190 return acpi_match_hid(aa->aa_node->ad_devinfo, compatible); 191 } 192 193 static void 194 sniiic_acpi_attach(device_t parent, device_t self, void *aux) 195 { 196 struct sniiic_softc * const sc = device_private(self); 197 struct acpi_attach_args *aa = aux; 198 bus_space_handle_t ioh; 199 struct i2cbus_attach_args iba; 200 struct acpi_resources res; 201 struct acpi_mem *mem; 202 struct acpi_irq *irq; 203 ACPI_STATUS rv; 204 205 rv = acpi_resource_parse(self, aa->aa_node->ad_handle, "_CRS", 206 &res, &acpi_resource_parse_ops_default); 207 if (ACPI_FAILURE(rv)) 208 return; 209 mem = acpi_res_mem(&res, 0); 210 irq = acpi_res_irq(&res, 0); 211 if (mem == NULL || irq == NULL || mem->ar_length == 0) { 212 aprint_error(": incomplete resources\n"); 213 return; 214 } 215 if (bus_space_map(aa->aa_memt, mem->ar_base, mem->ar_length, 0, 216 &ioh)) { 217 aprint_error(": couldn't map registers\n"); 218 return; 219 } 220 sc->sc_ih = acpi_intr_establish(self, 221 (uint64_t)(uintptr_t)aa->aa_node->ad_handle, 222 IPL_BIO, false, sni_i2c_intr, sc, device_xname(self)); 223 if (sc->sc_ih == NULL) { 224 aprint_error_dev(self, "couldn't establish interrupt\n"); 225 goto fail; 226 } 227 228 aprint_naive("\n"); 229 aprint_normal_dev(self, ": Socionext I2C controller\n"); 230 231 sc->sc_dev = self; 232 sc->sc_iot = aa->aa_memt; 233 sc->sc_ioh = ioh; 234 sc->sc_iob = mem->ar_base; 235 sc->sc_ios = mem->ar_length; 236 mutex_init(&sc->sc_lock, MUTEX_DEFAULT, IPL_NONE); 237 mutex_init(&sc->sc_mtx, MUTEX_DEFAULT, IPL_NET); 238 cv_init(&sc->sc_cv, device_xname(self)); 239 240 iic_tag_init(&sc->sc_ic); 241 sc->sc_ic.ic_cookie = sc; 242 sc->sc_ic.ic_acquire_bus = sni_i2c_acquire_bus; 243 sc->sc_ic.ic_release_bus = sni_i2c_release_bus; 244 sc->sc_ic.ic_exec = sni_i2c_exec; 245 246 memset(&iba, 0, sizeof(iba)); 247 iba.iba_tag = &sc->sc_ic; 248 #if 0 249 (void) config_found_ia(sc->sc_dev, "i2cbus", &iba, iicbus_print); 250 #endif 251 252 acpi_resource_cleanup(&res); 253 254 return; 255 fail: 256 bus_space_unmap(sc->sc_iot, sc->sc_ioh, sc->sc_ios); 257 acpi_resource_cleanup(&res); 258 return; 259 } 260 261 static int 262 sni_i2c_acquire_bus(void *opaque, int flags) 263 { 264 struct sniiic_softc *sc = opaque; 265 266 mutex_enter(&sc->sc_lock); 267 while (sc->sc_busy) 268 cv_wait(&sc->sc_cv, &sc->sc_lock); 269 sc->sc_busy = true; 270 mutex_exit(&sc->sc_lock); 271 272 return 0; 273 } 274 275 static void 276 sni_i2c_release_bus(void *opaque, int flags) 277 { 278 struct sniiic_softc *sc = opaque; 279 280 mutex_enter(&sc->sc_lock); 281 sc->sc_busy = false; 282 cv_broadcast(&sc->sc_cv); 283 mutex_exit(&sc->sc_lock); 284 } 285 286 static int 287 sni_i2c_exec(void *opaque, i2c_op_t op, i2c_addr_t addr, 288 const void *cmdbuf, size_t cmdlen, void *buf, size_t len, int flags) 289 { 290 struct sniiic_softc *sc = opaque; 291 int err; 292 #if 0 293 printf("%s: exec op: %d addr: 0x%x cmdlen: %d len: %d flags 0x%x\n", 294 device_xname(sc->sc_dev), op, addr, (int)cmdlen, (int)len, flags); 295 #endif 296 297 err = 0; 298 /* AAA */ 299 goto done; 300 done: 301 if (err) 302 sni_i2c_reset(sc); 303 sni_i2c_flush(sc); 304 return err; 305 } 306 307 static int 308 sni_i2c_intr(void *arg) 309 { 310 struct sniiic_softc * const sc = arg; 311 uint32_t stat = 0; 312 313 (void)stat; 314 mutex_enter(&sc->sc_mtx); 315 cv_broadcast(&sc->sc_cv); 316 mutex_exit(&sc->sc_mtx); 317 return 1; 318 } 319 320 static void 321 sni_i2c_reset(struct sniiic_softc *sc) 322 { 323 /* AAA */ 324 } 325 326 static void 327 sni_i2c_flush(struct sniiic_softc *sc) 328 { 329 /* AAA */ 330 } 331 332 static i2c_tag_t 333 sni_i2c_get_tag(device_t dev) 334 { 335 struct sniiic_softc * const sc = device_private(dev); 336 337 return &sc->sc_ic; 338 } 339
Indexes created Mon Sep 29 21:09:56 GMT 2025