ichsmb.c revision 1.8
1 /* $NetBSD: ichsmb.c,v 1.8 2007/08/27 15:57:14 xtraeme Exp $ */ 2 /* $OpenBSD: ichiic.c,v 1.18 2007/05/03 09:36:26 dlg Exp $ */ 3 4 /* 5 * Copyright (c) 2005, 2006 Alexander Yurchenko <grange (at) openbsd.org> 6 * 7 * Permission to use, copy, modify, and distribute this software for any 8 * purpose with or without fee is hereby granted, provided that the above 9 * copyright notice and this permission notice appear in all copies. 10 * 11 * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES 12 * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF 13 * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR 14 * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES 15 * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN 16 * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF 17 * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE. 18 */ 19 20 /* 21 * Intel ICH SMBus controller driver. 22 */ 23 24 #include <sys/cdefs.h> 25 __KERNEL_RCSID(0, "$NetBSD: ichsmb.c,v 1.8 2007/08/27 15:57:14 xtraeme Exp $"); 26 27 #include <sys/param.h> 28 #include <sys/device.h> 29 #include <sys/errno.h> 30 #include <sys/kernel.h> 31 #include <sys/rwlock.h> 32 #include <sys/proc.h> 33 34 #include <machine/bus.h> 35 36 #include <dev/pci/pcidevs.h> 37 #include <dev/pci/pcireg.h> 38 #include <dev/pci/pcivar.h> 39 40 #include <dev/ic/i82801lpcreg.h> 41 42 #include <dev/i2c/i2cvar.h> 43 44 #ifdef ICHIIC_DEBUG 45 #define DPRINTF(x) printf x 46 #else 47 #define DPRINTF(x) 48 #endif 49 50 #define ICHIIC_DELAY 100 51 #define ICHIIC_TIMEOUT 1 52 53 struct ichsmb_softc { 54 struct device sc_dev; 55 56 bus_space_tag_t sc_iot; 57 bus_space_handle_t sc_ioh; 58 void * sc_ih; 59 int sc_poll; 60 61 struct i2c_controller sc_i2c_tag; 62 krwlock_t sc_i2c_rwlock; 63 struct { 64 i2c_op_t op; 65 void * buf; 66 size_t len; 67 int flags; 68 volatile int error; 69 } sc_i2c_xfer; 70 }; 71 72 static int ichsmb_match(struct device *, struct cfdata *, void *); 73 static void ichsmb_attach(struct device *, struct device *, void *); 74 75 static int ichsmb_i2c_acquire_bus(void *, int); 76 static void ichsmb_i2c_release_bus(void *, int); 77 static int ichsmb_i2c_exec(void *, i2c_op_t, i2c_addr_t, const void *, 78 size_t, void *, size_t, int); 79 80 static int ichsmb_intr(void *); 81 82 83 CFATTACH_DECL(ichsmb, sizeof(struct ichsmb_softc), 84 ichsmb_match, ichsmb_attach, NULL, NULL); 85 86 87 static int 88 ichsmb_match(struct device *parent, struct cfdata *match, void *aux) 89 { 90 struct pci_attach_args *pa = aux; 91 92 if (PCI_VENDOR(pa->pa_id) == PCI_VENDOR_INTEL) { 93 switch (PCI_PRODUCT(pa->pa_id)) { 94 case PCI_PRODUCT_INTEL_6300ESB_SMB: 95 case PCI_PRODUCT_INTEL_63XXESB_SMB: 96 case PCI_PRODUCT_INTEL_82801AA_SMB: 97 case PCI_PRODUCT_INTEL_82801AB_SMB: 98 case PCI_PRODUCT_INTEL_82801BA_SMB: 99 case PCI_PRODUCT_INTEL_82801CA_SMB: 100 case PCI_PRODUCT_INTEL_82801DB_SMB: 101 case PCI_PRODUCT_INTEL_82801E_SMB: 102 case PCI_PRODUCT_INTEL_82801EB_SMB: 103 case PCI_PRODUCT_INTEL_82801FB_SMB: 104 case PCI_PRODUCT_INTEL_82801G_SMB: 105 case PCI_PRODUCT_INTEL_82801H_SMB: 106 case PCI_PRODUCT_INTEL_82801I_SMB: 107 return 1; 108 } 109 } 110 return 0; 111 } 112 113 static void 114 ichsmb_attach(struct device *parent, struct device *self, void *aux) 115 { 116 struct ichsmb_softc *sc = (struct ichsmb_softc *)self; 117 struct pci_attach_args *pa = aux; 118 struct i2cbus_attach_args iba; 119 pcireg_t conf; 120 bus_size_t iosize; 121 pci_intr_handle_t ih; 122 const char *intrstr = NULL; 123 char devinfo[256]; 124 125 aprint_naive("\n"); 126 pci_devinfo(pa->pa_id, pa->pa_class, 0, devinfo, sizeof(devinfo)); 127 aprint_normal(": %s (rev. 0x%02x)\n", devinfo, 128 PCI_REVISION(pa->pa_class)); 129 130 /* Read configuration */ 131 conf = pci_conf_read(pa->pa_pc, pa->pa_tag, LPCIB_SMB_HOSTC); 132 DPRINTF(("%s: conf 0x%08x", sc->sc_dev.dv_xname, conf)); 133 134 if ((conf & LPCIB_SMB_HOSTC_HSTEN) == 0) { 135 aprint_error("%s: SMBus disabled\n", sc->sc_dev.dv_xname); 136 return; 137 } 138 139 /* Map I/O space */ 140 if (pci_mapreg_map(pa, LPCIB_SMB_BASE, PCI_MAPREG_TYPE_IO, 0, 141 &sc->sc_iot, &sc->sc_ioh, NULL, &iosize)) { 142 aprint_error("%s: can't map I/O space\n", sc->sc_dev.dv_xname); 143 return; 144 } 145 146 sc->sc_poll = 1; 147 if (conf & LPCIB_SMB_HOSTC_SMIEN) { 148 /* No PCI IRQ */ 149 aprint_normal("%s: SMI\n", sc->sc_dev.dv_xname); 150 } else { 151 /* Install interrupt handler */ 152 if (pci_intr_map(pa, &ih) == 0) { 153 intrstr = pci_intr_string(pa->pa_pc, ih); 154 sc->sc_ih = pci_intr_establish(pa->pa_pc, ih, IPL_BIO, 155 ichsmb_intr, sc); 156 if (sc->sc_ih != NULL) { 157 aprint_normal("%s: interrupting at %s\n", 158 sc->sc_dev.dv_xname, intrstr); 159 sc->sc_poll = 0; 160 } 161 } 162 if (sc->sc_poll) 163 aprint_normal("%s: polling\n", sc->sc_dev.dv_xname); 164 } 165 166 /* Attach I2C bus */ 167 rw_init(&sc->sc_i2c_rwlock); 168 sc->sc_i2c_tag.ic_cookie = sc; 169 sc->sc_i2c_tag.ic_acquire_bus = ichsmb_i2c_acquire_bus; 170 sc->sc_i2c_tag.ic_release_bus = ichsmb_i2c_release_bus; 171 sc->sc_i2c_tag.ic_exec = ichsmb_i2c_exec; 172 173 bzero(&iba, sizeof(iba)); 174 iba.iba_tag = &sc->sc_i2c_tag; 175 config_found(self, &iba, iicbus_print); 176 177 return; 178 } 179 180 static int 181 ichsmb_i2c_acquire_bus(void *cookie, int flags) 182 { 183 struct ichsmb_softc *sc = cookie; 184 185 if (cold || sc->sc_poll || (flags & I2C_F_POLL)) 186 return 0; 187 188 rw_enter(&sc->sc_i2c_rwlock, RW_WRITER); 189 return 0; 190 } 191 192 static void 193 ichsmb_i2c_release_bus(void *cookie, int flags) 194 { 195 struct ichsmb_softc *sc = cookie; 196 197 if (cold || sc->sc_poll || (flags & I2C_F_POLL)) 198 return; 199 200 rw_exit(&sc->sc_i2c_rwlock); 201 } 202 203 static int 204 ichsmb_i2c_exec(void *cookie, i2c_op_t op, i2c_addr_t addr, 205 const void *cmdbuf, size_t cmdlen, void *buf, size_t len, int flags) 206 { 207 struct ichsmb_softc *sc = cookie; 208 const uint8_t *b; 209 uint8_t ctl = 0, st; 210 int retries; 211 char fbuf[64]; 212 213 DPRINTF(("%s: exec: op %d, addr 0x%02x, cmdlen %zu, len %d, " 214 "flags 0x%02x\n", sc->sc_dev.dv_xname, op, addr, cmdlen, 215 len, flags)); 216 217 /* Wait for bus to be idle */ 218 for (retries = 100; retries > 0; retries--) { 219 st = bus_space_read_1(sc->sc_iot, sc->sc_ioh, LPCIB_SMB_HS); 220 if (!(st & LPCIB_SMB_HS_BUSY)) 221 break; 222 DELAY(ICHIIC_DELAY); 223 } 224 #ifdef ICHIIC_DEBUG 225 bitmask_snprintf(st, LPCIB_SMB_HS_BITS, fbuf, sizeof(fbuf)); 226 printf("%s: exec: st 0x%s\n", sc->sc_dev.dv_xname, fbuf); 227 #endif 228 if (st & LPCIB_SMB_HS_BUSY) 229 return (1); 230 231 if (cold || sc->sc_poll) 232 flags |= I2C_F_POLL; 233 234 if (!I2C_OP_STOP_P(op) || cmdlen > 1 || len > 2) 235 return (1); 236 237 /* Setup transfer */ 238 sc->sc_i2c_xfer.op = op; 239 sc->sc_i2c_xfer.buf = buf; 240 sc->sc_i2c_xfer.len = len; 241 sc->sc_i2c_xfer.flags = flags; 242 sc->sc_i2c_xfer.error = 0; 243 244 /* Set slave address and transfer direction */ 245 bus_space_write_1(sc->sc_iot, sc->sc_ioh, LPCIB_SMB_TXSLVA, 246 LPCIB_SMB_TXSLVA_ADDR(addr) | 247 (I2C_OP_READ_P(op) ? LPCIB_SMB_TXSLVA_READ : 0)); 248 249 b = (const uint8_t *)cmdbuf; 250 if (cmdlen > 0) 251 /* Set command byte */ 252 bus_space_write_1(sc->sc_iot, sc->sc_ioh, LPCIB_SMB_HCMD, b[0]); 253 254 if (I2C_OP_WRITE_P(op)) { 255 /* Write data */ 256 b = buf; 257 if (len > 0) 258 bus_space_write_1(sc->sc_iot, sc->sc_ioh, 259 LPCIB_SMB_HD0, b[0]); 260 if (len > 1) 261 bus_space_write_1(sc->sc_iot, sc->sc_ioh, 262 LPCIB_SMB_HD1, b[1]); 263 } 264 265 /* Set SMBus command */ 266 if (len == 0) 267 ctl = LPCIB_SMB_HC_CMD_BYTE; 268 else if (len == 1) 269 ctl = LPCIB_SMB_HC_CMD_BDATA; 270 else if (len == 2) 271 ctl = LPCIB_SMB_HC_CMD_WDATA; 272 273 if ((flags & I2C_F_POLL) == 0) 274 ctl |= LPCIB_SMB_HC_INTREN; 275 276 /* Start transaction */ 277 ctl |= LPCIB_SMB_HC_START; 278 bus_space_write_1(sc->sc_iot, sc->sc_ioh, LPCIB_SMB_HC, ctl); 279 280 if (flags & I2C_F_POLL) { 281 /* Poll for completion */ 282 DELAY(ICHIIC_DELAY); 283 for (retries = 1000; retries > 0; retries--) { 284 st = bus_space_read_1(sc->sc_iot, sc->sc_ioh, 285 LPCIB_SMB_HS); 286 if ((st & LPCIB_SMB_HS_BUSY) == 0) 287 break; 288 DELAY(ICHIIC_DELAY); 289 } 290 if (st & LPCIB_SMB_HS_BUSY) 291 goto timeout; 292 ichsmb_intr(sc); 293 } else { 294 /* Wait for interrupt */ 295 if (tsleep(sc, PRIBIO, "iicexec", ICHIIC_TIMEOUT * hz)) 296 goto timeout; 297 } 298 299 if (sc->sc_i2c_xfer.error) 300 return (1); 301 302 return (0); 303 304 timeout: 305 /* 306 * Transfer timeout. Kill the transaction and clear status bits. 307 */ 308 bitmask_snprintf(st, LPCIB_SMB_HS_BITS, fbuf, sizeof(fbuf)); 309 printf("%s: exec: op %d, addr 0x%02x, cmdlen %zd, len %zd, " 310 "flags 0x%02x: timeout, status 0x%s\n", 311 sc->sc_dev.dv_xname, op, addr, cmdlen, len, flags, fbuf); 312 bus_space_write_1(sc->sc_iot, sc->sc_ioh, LPCIB_SMB_HC, 313 LPCIB_SMB_HC_KILL); 314 DELAY(ICHIIC_DELAY); 315 st = bus_space_read_1(sc->sc_iot, sc->sc_ioh, LPCIB_SMB_HS); 316 if ((st & LPCIB_SMB_HS_FAILED) == 0) { 317 bitmask_snprintf(st, LPCIB_SMB_HS_BITS, fbuf, sizeof(fbuf)); 318 printf("%s: abort failed, status 0x%s\n", 319 sc->sc_dev.dv_xname, fbuf); 320 } 321 bus_space_write_1(sc->sc_iot, sc->sc_ioh, LPCIB_SMB_HS, st); 322 return (1); 323 } 324 325 static int 326 ichsmb_intr(void *arg) 327 { 328 struct ichsmb_softc *sc = arg; 329 uint8_t st; 330 uint8_t *b; 331 size_t len; 332 #ifdef ICHIIC_DEBUG 333 char fbuf[64]; 334 #endif 335 336 /* Read status */ 337 st = bus_space_read_1(sc->sc_iot, sc->sc_ioh, LPCIB_SMB_HS); 338 if ((st & LPCIB_SMB_HS_BUSY) != 0 || (st & (LPCIB_SMB_HS_INTR | 339 LPCIB_SMB_HS_DEVERR | LPCIB_SMB_HS_BUSERR | LPCIB_SMB_HS_FAILED | 340 LPCIB_SMB_HS_SMBAL | LPCIB_SMB_HS_BDONE)) == 0) 341 /* Interrupt was not for us */ 342 return (0); 343 344 #ifdef ICHIIC_DEBUG 345 bitmask_snprintf(st, LPCIB_SMB_HS_BITS, fbuf, sizeof(fbuf)); 346 printf("%s: intr st 0x%s\n", sc->sc_dev.dv_xname, fbuf); 347 #endif 348 349 /* Clear status bits */ 350 bus_space_write_1(sc->sc_iot, sc->sc_ioh, LPCIB_SMB_HS, st); 351 352 /* Check for errors */ 353 if (st & (LPCIB_SMB_HS_DEVERR | LPCIB_SMB_HS_BUSERR | LPCIB_SMB_HS_FAILED)) { 354 sc->sc_i2c_xfer.error = 1; 355 goto done; 356 } 357 358 if (st & LPCIB_SMB_HS_INTR) { 359 if (I2C_OP_WRITE_P(sc->sc_i2c_xfer.op)) 360 goto done; 361 362 /* Read data */ 363 b = sc->sc_i2c_xfer.buf; 364 len = sc->sc_i2c_xfer.len; 365 if (len > 0) 366 b[0] = bus_space_read_1(sc->sc_iot, sc->sc_ioh, 367 LPCIB_SMB_HD0); 368 if (len > 1) 369 b[1] = bus_space_read_1(sc->sc_iot, sc->sc_ioh, 370 LPCIB_SMB_HD1); 371 } 372 373 done: 374 if ((sc->sc_i2c_xfer.flags & I2C_F_POLL) == 0) 375 wakeup(sc); 376 return (1); 377 } 378
Indexes created Thu Oct 02 14:10:14 GMT 2025