sni_i2c.c revision 1.10
1 /* $NetBSD: sni_i2c.c,v 1.10 2021/01/27 03:10:19 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 1.10 2021/01/27 03:10:19 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 const struct device_compatible_entry compat_data[] = { 99 { .compat = "socionext,synquacer-i2c" }, 100 DEVICE_COMPAT_EOL 101 }; 102 103 static int 104 sniiic_fdt_match(device_t parent, struct cfdata *match, void *aux) 105 { 106 struct fdt_attach_args * const faa = aux; 107 108 return of_compatible_match(faa->faa_phandle, compat_data); 109 } 110 111 static void 112 sniiic_fdt_attach(device_t parent, device_t self, void *aux) 113 { 114 struct sniiic_softc * const sc = device_private(self); 115 struct fdt_attach_args * const faa = aux; 116 const int phandle = faa->faa_phandle; 117 bus_space_handle_t ioh; 118 bus_addr_t addr; 119 bus_size_t size; 120 char intrstr[128]; 121 122 if (fdtbus_get_reg(phandle, 0, &addr, &size) != 0 123 || bus_space_map(faa->faa_bst, addr, size, 0, &ioh) != 0) { 124 aprint_error(": unable to map device\n"); 125 return; 126 } 127 if (!fdtbus_intr_str(phandle, 0, intrstr, sizeof(intrstr))) { 128 aprint_error(": failed to decode interrupt\n"); 129 goto fail; 130 } 131 sc->sc_ih = fdtbus_intr_establish(phandle, 132 0, IPL_BIO, 0, sni_i2c_intr, sc); 133 if (sc->sc_ih == NULL) { 134 aprint_error_dev(self, "couldn't establish interrupt\n"); 135 goto fail; 136 } 137 138 aprint_naive("\n"); 139 aprint_normal_dev(self, "interrupting on %s\n", intrstr); 140 141 sc->sc_dev = self; 142 sc->sc_iot = faa->faa_bst; 143 sc->sc_ioh = ioh; 144 sc->sc_iob = addr; 145 sc->sc_ios = size; 146 147 sni_i2c_common_i(sc); 148 149 fdtbus_register_i2c_controller(&sc->sc_ic, phandle); 150 #if 0 151 fdtbus_attach_i2cbus(self, phandle, &sc->sc_ic, iicbus_print); 152 #endif 153 return; 154 fail: 155 bus_space_unmap(sc->sc_iot, sc->sc_ioh, sc->sc_ios); 156 return; 157 } 158 159 static int 160 sniiic_acpi_match(device_t parent, struct cfdata *match, void *aux) 161 { 162 static const char * compatible[] = { 163 "SCX0003", 164 NULL 165 }; 166 struct acpi_attach_args *aa = aux; 167 168 if (aa->aa_node->ad_type != ACPI_TYPE_DEVICE) 169 return 0; 170 return acpi_match_hid(aa->aa_node->ad_devinfo, compatible); 171 } 172 173 static void 174 sniiic_acpi_attach(device_t parent, device_t self, void *aux) 175 { 176 struct sniiic_softc * const sc = device_private(self); 177 struct acpi_attach_args *aa = aux; 178 bus_space_handle_t ioh; 179 struct i2cbus_attach_args iba; 180 struct acpi_resources res; 181 struct acpi_mem *mem; 182 struct acpi_irq *irq; 183 ACPI_STATUS rv; 184 185 rv = acpi_resource_parse(self, aa->aa_node->ad_handle, "_CRS", 186 &res, &acpi_resource_parse_ops_default); 187 if (ACPI_FAILURE(rv)) 188 return; 189 mem = acpi_res_mem(&res, 0); 190 irq = acpi_res_irq(&res, 0); 191 if (mem == NULL || irq == NULL || mem->ar_length == 0) { 192 aprint_error(": incomplete resources\n"); 193 return; 194 } 195 if (bus_space_map(aa->aa_memt, mem->ar_base, mem->ar_length, 0, 196 &ioh)) { 197 aprint_error(": couldn't map registers\n"); 198 return; 199 } 200 sc->sc_ih = acpi_intr_establish(self, 201 (uint64_t)(uintptr_t)aa->aa_node->ad_handle, 202 IPL_BIO, false, sni_i2c_intr, sc, device_xname(self)); 203 if (sc->sc_ih == NULL) { 204 aprint_error_dev(self, "couldn't establish interrupt\n"); 205 goto fail; 206 } 207 208 aprint_naive("\n"); 209 210 sc->sc_dev = self; 211 sc->sc_iot = aa->aa_memt; 212 sc->sc_ioh = ioh; 213 sc->sc_iob = mem->ar_base; 214 sc->sc_ios = mem->ar_length; 215 216 sni_i2c_common_i(sc); 217 218 memset(&iba, 0, sizeof(iba)); 219 iba.iba_tag = &sc->sc_ic; 220 #if 0 221 (void) config_found_ia(sc->sc_dev, "i2cbus", &iba, iicbus_print); 222 #endif 223 224 acpi_resource_cleanup(&res); 225 226 return; 227 fail: 228 bus_space_unmap(sc->sc_iot, sc->sc_ioh, sc->sc_ios); 229 acpi_resource_cleanup(&res); 230 return; 231 } 232 233 void 234 sni_i2c_common_i(struct sniiic_softc *sc) 235 { 236 237 aprint_normal_dev(sc->sc_dev, "Socionext I2C controller\n"); 238 239 iic_tag_init(&sc->sc_ic); 240 sc->sc_ic.ic_cookie = sc; 241 sc->sc_ic.ic_acquire_bus = sni_i2c_acquire_bus; 242 sc->sc_ic.ic_release_bus = sni_i2c_release_bus; 243 sc->sc_ic.ic_exec = sni_i2c_exec; 244 mutex_init(&sc->sc_lock, MUTEX_DEFAULT, IPL_NONE); 245 mutex_init(&sc->sc_mtx, MUTEX_DEFAULT, IPL_BIO); 246 cv_init(&sc->sc_cv, device_xname(sc->sc_dev)); 247 248 /* no attach here */ 249 } 250 251 static int 252 sni_i2c_acquire_bus(void *opaque, int flags) 253 { 254 struct sniiic_softc *sc = opaque; 255 256 mutex_enter(&sc->sc_lock); 257 while (sc->sc_busy) 258 cv_wait(&sc->sc_cv, &sc->sc_lock); 259 sc->sc_busy = true; 260 mutex_exit(&sc->sc_lock); 261 262 return 0; 263 } 264 265 static void 266 sni_i2c_release_bus(void *opaque, int flags) 267 { 268 struct sniiic_softc *sc = opaque; 269 270 mutex_enter(&sc->sc_lock); 271 sc->sc_busy = false; 272 cv_broadcast(&sc->sc_cv); 273 mutex_exit(&sc->sc_lock); 274 } 275 276 static int 277 sni_i2c_exec(void *opaque, i2c_op_t op, i2c_addr_t addr, 278 const void *cmdbuf, size_t cmdlen, void *buf, size_t len, int flags) 279 { 280 struct sniiic_softc *sc = opaque; 281 int err; 282 #if 0 283 printf("%s: exec op: %d addr: 0x%x cmdlen: %d len: %d flags 0x%x\n", 284 device_xname(sc->sc_dev), op, addr, (int)cmdlen, (int)len, flags); 285 #endif 286 287 err = 0; 288 /* AAA */ 289 goto done; 290 done: 291 if (err) 292 sni_i2c_reset(sc); 293 sni_i2c_flush(sc); 294 return err; 295 } 296 297 static int 298 sni_i2c_intr(void *arg) 299 { 300 struct sniiic_softc * const sc = arg; 301 uint32_t stat = 0; 302 303 (void)stat; 304 mutex_enter(&sc->sc_mtx); 305 cv_broadcast(&sc->sc_cv); 306 mutex_exit(&sc->sc_mtx); 307 return 1; 308 } 309 310 static void 311 sni_i2c_reset(struct sniiic_softc *sc) 312 { 313 /* AAA */ 314 } 315 316 static void 317 sni_i2c_flush(struct sniiic_softc *sc) 318 { 319 /* AAA */ 320 } 321
Indexes created Sun Sep 28 16:09:52 GMT 2025