sni_i2c.c revision 1.9
1 /* $NetBSD: sni_i2c.c,v 1.9 2020/12/23 16:02:11 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 1.9 2020/12/23 16:02:11 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 #define I2C_READ(sc, reg) \ 94 bus_space_read_4((sc)->sc_ioh,(sc)->sc_ioh,(reg)) 95 #define I2C_WRITE(sc, reg, val) \ 96 bus_space_write_4((sc)->sc_ioh,(sc)->sc_ioh,(reg),(val)) 97 98 static int 99 sniiic_fdt_match(device_t parent, struct cfdata *match, void *aux) 100 { 101 static const char * compatible[] = { 102 "socionext,synquacer-i2c", 103 NULL 104 }; 105 struct fdt_attach_args * const faa = aux; 106 107 return of_match_compatible(faa->faa_phandle, compatible); 108 } 109 110 static void 111 sniiic_fdt_attach(device_t parent, device_t self, void *aux) 112 { 113 struct sniiic_softc * const sc = device_private(self); 114 struct fdt_attach_args * const faa = aux; 115 const int phandle = faa->faa_phandle; 116 bus_space_handle_t ioh; 117 bus_addr_t addr; 118 bus_size_t size; 119 char intrstr[128]; 120 121 if (fdtbus_get_reg(phandle, 0, &addr, &size) != 0 122 || bus_space_map(faa->faa_bst, addr, size, 0, &ioh) != 0) { 123 aprint_error(": unable to map device\n"); 124 return; 125 } 126 if (!fdtbus_intr_str(phandle, 0, intrstr, sizeof(intrstr))) { 127 aprint_error(": failed to decode interrupt\n"); 128 goto fail; 129 } 130 sc->sc_ih = fdtbus_intr_establish(phandle, 131 0, IPL_BIO, 0, sni_i2c_intr, sc); 132 if (sc->sc_ih == NULL) { 133 aprint_error_dev(self, "couldn't establish interrupt\n"); 134 goto fail; 135 } 136 137 aprint_naive("\n"); 138 aprint_normal_dev(self, "interrupting on %s\n", intrstr); 139 140 sc->sc_dev = self; 141 sc->sc_iot = faa->faa_bst; 142 sc->sc_ioh = ioh; 143 sc->sc_iob = addr; 144 sc->sc_ios = size; 145 146 sni_i2c_common_i(sc); 147 148 fdtbus_register_i2c_controller(&sc->sc_ic, phandle); 149 #if 0 150 fdtbus_attach_i2cbus(self, phandle, &sc->sc_ic, iicbus_print); 151 #endif 152 return; 153 fail: 154 bus_space_unmap(sc->sc_iot, sc->sc_ioh, sc->sc_ios); 155 return; 156 } 157 158 static int 159 sniiic_acpi_match(device_t parent, struct cfdata *match, void *aux) 160 { 161 static const char * compatible[] = { 162 "SCX0003", 163 NULL 164 }; 165 struct acpi_attach_args *aa = aux; 166 167 if (aa->aa_node->ad_type != ACPI_TYPE_DEVICE) 168 return 0; 169 return acpi_match_hid(aa->aa_node->ad_devinfo, compatible); 170 } 171 172 static void 173 sniiic_acpi_attach(device_t parent, device_t self, void *aux) 174 { 175 struct sniiic_softc * const sc = device_private(self); 176 struct acpi_attach_args *aa = aux; 177 bus_space_handle_t ioh; 178 struct i2cbus_attach_args iba; 179 struct acpi_resources res; 180 struct acpi_mem *mem; 181 struct acpi_irq *irq; 182 ACPI_STATUS rv; 183 184 rv = acpi_resource_parse(self, aa->aa_node->ad_handle, "_CRS", 185 &res, &acpi_resource_parse_ops_default); 186 if (ACPI_FAILURE(rv)) 187 return; 188 mem = acpi_res_mem(&res, 0); 189 irq = acpi_res_irq(&res, 0); 190 if (mem == NULL || irq == NULL || mem->ar_length == 0) { 191 aprint_error(": incomplete resources\n"); 192 return; 193 } 194 if (bus_space_map(aa->aa_memt, mem->ar_base, mem->ar_length, 0, 195 &ioh)) { 196 aprint_error(": couldn't map registers\n"); 197 return; 198 } 199 sc->sc_ih = acpi_intr_establish(self, 200 (uint64_t)(uintptr_t)aa->aa_node->ad_handle, 201 IPL_BIO, false, sni_i2c_intr, sc, device_xname(self)); 202 if (sc->sc_ih == NULL) { 203 aprint_error_dev(self, "couldn't establish interrupt\n"); 204 goto fail; 205 } 206 207 aprint_naive("\n"); 208 209 sc->sc_dev = self; 210 sc->sc_iot = aa->aa_memt; 211 sc->sc_ioh = ioh; 212 sc->sc_iob = mem->ar_base; 213 sc->sc_ios = mem->ar_length; 214 215 sni_i2c_common_i(sc); 216 217 memset(&iba, 0, sizeof(iba)); 218 iba.iba_tag = &sc->sc_ic; 219 #if 0 220 (void) config_found_ia(sc->sc_dev, "i2cbus", &iba, iicbus_print); 221 #endif 222 223 acpi_resource_cleanup(&res); 224 225 return; 226 fail: 227 bus_space_unmap(sc->sc_iot, sc->sc_ioh, sc->sc_ios); 228 acpi_resource_cleanup(&res); 229 return; 230 } 231 232 void 233 sni_i2c_common_i(struct sniiic_softc *sc) 234 { 235 236 aprint_normal_dev(sc->sc_dev, "Socionext I2C controller\n"); 237 238 iic_tag_init(&sc->sc_ic); 239 sc->sc_ic.ic_cookie = sc; 240 sc->sc_ic.ic_acquire_bus = sni_i2c_acquire_bus; 241 sc->sc_ic.ic_release_bus = sni_i2c_release_bus; 242 sc->sc_ic.ic_exec = sni_i2c_exec; 243 mutex_init(&sc->sc_lock, MUTEX_DEFAULT, IPL_NONE); 244 mutex_init(&sc->sc_mtx, MUTEX_DEFAULT, IPL_BIO); 245 cv_init(&sc->sc_cv, device_xname(sc->sc_dev)); 246 247 /* no attach here */ 248 } 249 250 static int 251 sni_i2c_acquire_bus(void *opaque, int flags) 252 { 253 struct sniiic_softc *sc = opaque; 254 255 mutex_enter(&sc->sc_lock); 256 while (sc->sc_busy) 257 cv_wait(&sc->sc_cv, &sc->sc_lock); 258 sc->sc_busy = true; 259 mutex_exit(&sc->sc_lock); 260 261 return 0; 262 } 263 264 static void 265 sni_i2c_release_bus(void *opaque, int flags) 266 { 267 struct sniiic_softc *sc = opaque; 268 269 mutex_enter(&sc->sc_lock); 270 sc->sc_busy = false; 271 cv_broadcast(&sc->sc_cv); 272 mutex_exit(&sc->sc_lock); 273 } 274 275 static int 276 sni_i2c_exec(void *opaque, i2c_op_t op, i2c_addr_t addr, 277 const void *cmdbuf, size_t cmdlen, void *buf, size_t len, int flags) 278 { 279 struct sniiic_softc *sc = opaque; 280 int err; 281 #if 0 282 printf("%s: exec op: %d addr: 0x%x cmdlen: %d len: %d flags 0x%x\n", 283 device_xname(sc->sc_dev), op, addr, (int)cmdlen, (int)len, flags); 284 #endif 285 286 err = 0; 287 /* AAA */ 288 goto done; 289 done: 290 if (err) 291 sni_i2c_reset(sc); 292 sni_i2c_flush(sc); 293 return err; 294 } 295 296 static int 297 sni_i2c_intr(void *arg) 298 { 299 struct sniiic_softc * const sc = arg; 300 uint32_t stat = 0; 301 302 (void)stat; 303 mutex_enter(&sc->sc_mtx); 304 cv_broadcast(&sc->sc_cv); 305 mutex_exit(&sc->sc_mtx); 306 return 1; 307 } 308 309 static void 310 sni_i2c_reset(struct sniiic_softc *sc) 311 { 312 /* AAA */ 313 } 314 315 static void 316 sni_i2c_flush(struct sniiic_softc *sc) 317 { 318 /* AAA */ 319 } 320
Indexes created Sat Sep 27 22:09:54 GMT 2025