sni_i2c.c revision 1.7
1 /* $NetBSD: sni_i2c.c,v 1.7 2020/05/31 23:55:18 thorpej 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 1.7 2020/05/31 23:55:18 thorpej 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 bus_space_tag_t sc_iot; 65 bus_space_handle_t sc_ioh; 66 bus_addr_t sc_iob; 67 bus_size_t sc_ios; 68 void *sc_ih; 69 kmutex_t sc_lock; 70 kmutex_t sc_mtx; 71 kcondvar_t sc_cv; 72 volatile bool sc_busy; 73 int sc_phandle; 74 }; 75 76 CFATTACH_DECL_NEW(sniiic_fdt, sizeof(struct sniiic_softc), 77 sniiic_fdt_match, sniiic_fdt_attach, NULL, NULL); 78 79 CFATTACH_DECL_NEW(sniiic_acpi, sizeof(struct sniiic_softc), 80 sniiic_acpi_match, sniiic_acpi_attach, NULL, NULL); 81 82 void sni_i2c_common_i(struct sniiic_softc *); 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]; 126 127 if (fdtbus_get_reg(phandle, 0, &addr, &size) != 0 128 || bus_space_map(faa->faa_bst, addr, size, 0, &ioh) != 0) { 129 aprint_error(": unable to map device\n"); 130 return; 131 } 132 if (!fdtbus_intr_str(phandle, 0, intrstr, sizeof(intrstr))) { 133 aprint_error(": failed to decode interrupt\n"); 134 goto fail; 135 } 136 sc->sc_ih = fdtbus_intr_establish(phandle, 137 0, IPL_BIO, 0, sni_i2c_intr, sc); 138 if (sc->sc_ih == NULL) { 139 aprint_error_dev(self, "couldn't establish interrupt\n"); 140 goto fail; 141 } 142 143 aprint_naive("\n"); 144 aprint_normal_dev(self, "interrupting on %s\n", intrstr); 145 146 sc->sc_dev = self; 147 sc->sc_iot = faa->faa_bst; 148 sc->sc_ioh = ioh; 149 sc->sc_iob = addr; 150 sc->sc_ios = size; 151 152 sni_i2c_common_i(sc); 153 154 fdtbus_register_i2c_controller(self, phandle, &sni_i2c_funcs); 155 #if 0 156 fdtbus_attach_i2cbus(self, phandle, &sc->sc_ic, iicbus_print); 157 #endif 158 return; 159 fail: 160 bus_space_unmap(sc->sc_iot, sc->sc_ioh, sc->sc_ios); 161 return; 162 } 163 164 static int 165 sniiic_acpi_match(device_t parent, struct cfdata *match, void *aux) 166 { 167 static const char * compatible[] = { 168 "SCX0003", 169 NULL 170 }; 171 struct acpi_attach_args *aa = aux; 172 173 if (aa->aa_node->ad_type != ACPI_TYPE_DEVICE) 174 return 0; 175 return acpi_match_hid(aa->aa_node->ad_devinfo, compatible); 176 } 177 178 static void 179 sniiic_acpi_attach(device_t parent, device_t self, void *aux) 180 { 181 struct sniiic_softc * const sc = device_private(self); 182 struct acpi_attach_args *aa = aux; 183 bus_space_handle_t ioh; 184 struct i2cbus_attach_args iba; 185 struct acpi_resources res; 186 struct acpi_mem *mem; 187 struct acpi_irq *irq; 188 ACPI_STATUS rv; 189 190 rv = acpi_resource_parse(self, aa->aa_node->ad_handle, "_CRS", 191 &res, &acpi_resource_parse_ops_default); 192 if (ACPI_FAILURE(rv)) 193 return; 194 mem = acpi_res_mem(&res, 0); 195 irq = acpi_res_irq(&res, 0); 196 if (mem == NULL || irq == NULL || mem->ar_length == 0) { 197 aprint_error(": incomplete resources\n"); 198 return; 199 } 200 if (bus_space_map(aa->aa_memt, mem->ar_base, mem->ar_length, 0, 201 &ioh)) { 202 aprint_error(": couldn't map registers\n"); 203 return; 204 } 205 sc->sc_ih = acpi_intr_establish(self, 206 (uint64_t)(uintptr_t)aa->aa_node->ad_handle, 207 IPL_BIO, false, sni_i2c_intr, sc, device_xname(self)); 208 if (sc->sc_ih == NULL) { 209 aprint_error_dev(self, "couldn't establish interrupt\n"); 210 goto fail; 211 } 212 213 aprint_naive("\n"); 214 215 sc->sc_dev = self; 216 sc->sc_iot = aa->aa_memt; 217 sc->sc_ioh = ioh; 218 sc->sc_iob = mem->ar_base; 219 sc->sc_ios = mem->ar_length; 220 221 sni_i2c_common_i(sc); 222 223 memset(&iba, 0, sizeof(iba)); 224 iba.iba_tag = &sc->sc_ic; 225 #if 0 226 (void) config_found_ia(sc->sc_dev, "i2cbus", &iba, iicbus_print); 227 #endif 228 229 acpi_resource_cleanup(&res); 230 231 return; 232 fail: 233 bus_space_unmap(sc->sc_iot, sc->sc_ioh, sc->sc_ios); 234 acpi_resource_cleanup(&res); 235 return; 236 } 237 238 void 239 sni_i2c_common_i(struct sniiic_softc *sc) 240 { 241 242 aprint_normal_dev(sc->sc_dev, "Socionext I2C controller\n"); 243 244 iic_tag_init(&sc->sc_ic); 245 sc->sc_ic.ic_cookie = sc; 246 sc->sc_ic.ic_acquire_bus = sni_i2c_acquire_bus; 247 sc->sc_ic.ic_release_bus = sni_i2c_release_bus; 248 sc->sc_ic.ic_exec = sni_i2c_exec; 249 mutex_init(&sc->sc_lock, MUTEX_DEFAULT, IPL_NONE); 250 mutex_init(&sc->sc_mtx, MUTEX_DEFAULT, IPL_BIO); 251 cv_init(&sc->sc_cv, device_xname(sc->sc_dev)); 252 253 /* no attach here */ 254 } 255 256 static int 257 sni_i2c_acquire_bus(void *opaque, int flags) 258 { 259 struct sniiic_softc *sc = opaque; 260 261 mutex_enter(&sc->sc_lock); 262 while (sc->sc_busy) 263 cv_wait(&sc->sc_cv, &sc->sc_lock); 264 sc->sc_busy = true; 265 mutex_exit(&sc->sc_lock); 266 267 return 0; 268 } 269 270 static void 271 sni_i2c_release_bus(void *opaque, int flags) 272 { 273 struct sniiic_softc *sc = opaque; 274 275 mutex_enter(&sc->sc_lock); 276 sc->sc_busy = false; 277 cv_broadcast(&sc->sc_cv); 278 mutex_exit(&sc->sc_lock); 279 } 280 281 static int 282 sni_i2c_exec(void *opaque, i2c_op_t op, i2c_addr_t addr, 283 const void *cmdbuf, size_t cmdlen, void *buf, size_t len, int flags) 284 { 285 struct sniiic_softc *sc = opaque; 286 int err; 287 #if 0 288 printf("%s: exec op: %d addr: 0x%x cmdlen: %d len: %d flags 0x%x\n", 289 device_xname(sc->sc_dev), op, addr, (int)cmdlen, (int)len, flags); 290 #endif 291 292 err = 0; 293 /* AAA */ 294 goto done; 295 done: 296 if (err) 297 sni_i2c_reset(sc); 298 sni_i2c_flush(sc); 299 return err; 300 } 301 302 static int 303 sni_i2c_intr(void *arg) 304 { 305 struct sniiic_softc * const sc = arg; 306 uint32_t stat = 0; 307 308 (void)stat; 309 mutex_enter(&sc->sc_mtx); 310 cv_broadcast(&sc->sc_cv); 311 mutex_exit(&sc->sc_mtx); 312 return 1; 313 } 314 315 static void 316 sni_i2c_reset(struct sniiic_softc *sc) 317 { 318 /* AAA */ 319 } 320 321 static void 322 sni_i2c_flush(struct sniiic_softc *sc) 323 { 324 /* AAA */ 325 } 326 327 static i2c_tag_t 328 sni_i2c_get_tag(device_t dev) 329 { 330 struct sniiic_softc * const sc = device_private(dev); 331 332 return &sc->sc_ic; 333 } 334
Indexes created Sun Oct 19 19:09:49 GMT 2025