/* $OpenBSD: ichiic.c,v 1.20 2008/04/20 20:51:58 deraadt Exp $ */ /* * Copyright (c) 2005, 2006 Alexander Yurchenko * * Permission to use, copy, modify, and distribute this software for any * purpose with or without fee is hereby granted, provided that the above * copyright notice and this permission notice appear in all copies. * * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE. */ /* * Intel ICH SMBus controller driver. */ #include #include #include #include #include #include #include #include #include #include #include #include #ifdef ICHIIC_DEBUG #define DPRINTF(x) printf x #else #define DPRINTF(x) #endif #define ICHIIC_DELAY 100 #define ICHIIC_TIMEOUT 1 struct ichiic_softc { struct device sc_dev; bus_space_tag_t sc_iot; bus_space_handle_t sc_ioh; void * sc_ih; int sc_poll; struct i2c_controller sc_i2c_tag; struct rwlock sc_i2c_lock; struct { i2c_op_t op; void * buf; size_t len; int flags; volatile int error; } sc_i2c_xfer; }; int ichiic_match(struct device *, void *, void *); void ichiic_attach(struct device *, struct device *, void *); int ichiic_i2c_acquire_bus(void *, int); void ichiic_i2c_release_bus(void *, int); int ichiic_i2c_exec(void *, i2c_op_t, i2c_addr_t, const void *, size_t, void *, size_t, int); int ichiic_intr(void *); struct cfattach ichiic_ca = { sizeof(struct ichiic_softc), ichiic_match, ichiic_attach }; struct cfdriver ichiic_cd = { NULL, "ichiic", DV_DULL }; const struct pci_matchid ichiic_ids[] = { { PCI_VENDOR_INTEL, PCI_PRODUCT_INTEL_6300ESB_SMB }, { PCI_VENDOR_INTEL, PCI_PRODUCT_INTEL_6321ESB_SMB }, { PCI_VENDOR_INTEL, PCI_PRODUCT_INTEL_82801AA_SMB }, { PCI_VENDOR_INTEL, PCI_PRODUCT_INTEL_82801AB_SMB }, { PCI_VENDOR_INTEL, PCI_PRODUCT_INTEL_82801BA_SMB }, { PCI_VENDOR_INTEL, PCI_PRODUCT_INTEL_82801CA_SMB }, { PCI_VENDOR_INTEL, PCI_PRODUCT_INTEL_82801DB_SMB }, { PCI_VENDOR_INTEL, PCI_PRODUCT_INTEL_82801E_SMB }, { PCI_VENDOR_INTEL, PCI_PRODUCT_INTEL_82801EB_SMB }, { PCI_VENDOR_INTEL, PCI_PRODUCT_INTEL_82801FB_SMB }, { PCI_VENDOR_INTEL, PCI_PRODUCT_INTEL_82801GB_SMB }, { PCI_VENDOR_INTEL, PCI_PRODUCT_INTEL_82801H_SMB }, { PCI_VENDOR_INTEL, PCI_PRODUCT_INTEL_82801I_SMB } }; int ichiic_match(struct device *parent, void *match, void *aux) { return (pci_matchbyid(aux, ichiic_ids, sizeof(ichiic_ids) / sizeof(ichiic_ids[0]))); } void ichiic_attach(struct device *parent, struct device *self, void *aux) { struct ichiic_softc *sc = (struct ichiic_softc *)self; struct pci_attach_args *pa = aux; struct i2cbus_attach_args iba; pcireg_t conf; bus_size_t iosize; pci_intr_handle_t ih; const char *intrstr = NULL; /* Read configuration */ conf = pci_conf_read(pa->pa_pc, pa->pa_tag, ICH_SMB_HOSTC); DPRINTF((": conf 0x%08x", conf)); if ((conf & ICH_SMB_HOSTC_HSTEN) == 0) { printf(": SMBus disabled\n"); return; } /* Map I/O space */ if (pci_mapreg_map(pa, ICH_SMB_BASE, PCI_MAPREG_TYPE_IO, 0, &sc->sc_iot, &sc->sc_ioh, NULL, &iosize, 0)) { printf(": can't map I/O space\n"); return; } sc->sc_poll = 1; if (conf & ICH_SMB_HOSTC_SMIEN) { /* No PCI IRQ */ printf(": SMI"); } else { /* Install interrupt handler */ if (pci_intr_map(pa, &ih) == 0) { intrstr = pci_intr_string(pa->pa_pc, ih); sc->sc_ih = pci_intr_establish(pa->pa_pc, ih, IPL_BIO, ichiic_intr, sc, sc->sc_dev.dv_xname); if (sc->sc_ih != NULL) { printf(": %s", intrstr); sc->sc_poll = 0; } } if (sc->sc_poll) printf(": polling"); } printf("\n"); /* Attach I2C bus */ rw_init(&sc->sc_i2c_lock, "iiclk"); sc->sc_i2c_tag.ic_cookie = sc; sc->sc_i2c_tag.ic_acquire_bus = ichiic_i2c_acquire_bus; sc->sc_i2c_tag.ic_release_bus = ichiic_i2c_release_bus; sc->sc_i2c_tag.ic_exec = ichiic_i2c_exec; bzero(&iba, sizeof(iba)); iba.iba_name = "iic"; iba.iba_tag = &sc->sc_i2c_tag; config_found(self, &iba, iicbus_print); return; } int ichiic_i2c_acquire_bus(void *cookie, int flags) { struct ichiic_softc *sc = cookie; if (cold || sc->sc_poll || (flags & I2C_F_POLL)) return (0); return (rw_enter(&sc->sc_i2c_lock, RW_WRITE | RW_INTR)); } void ichiic_i2c_release_bus(void *cookie, int flags) { struct ichiic_softc *sc = cookie; if (cold || sc->sc_poll || (flags & I2C_F_POLL)) return; rw_exit(&sc->sc_i2c_lock); } int ichiic_i2c_exec(void *cookie, i2c_op_t op, i2c_addr_t addr, const void *cmdbuf, size_t cmdlen, void *buf, size_t len, int flags) { struct ichiic_softc *sc = cookie; u_int8_t *b; u_int8_t ctl, st; int retries; DPRINTF(("%s: exec: op %d, addr 0x%02x, cmdlen %d, len %d, " "flags 0x%02x\n", sc->sc_dev.dv_xname, op, addr, cmdlen, len, flags)); /* Wait for bus to be idle */ for (retries = 100; retries > 0; retries--) { st = bus_space_read_1(sc->sc_iot, sc->sc_ioh, ICH_SMB_HS); if (!(st & ICH_SMB_HS_BUSY)) break; DELAY(ICHIIC_DELAY); } DPRINTF(("%s: exec: st 0x%b\n", sc->sc_dev.dv_xname, st, ICH_SMB_HS_BITS)); if (st & ICH_SMB_HS_BUSY) return (1); if (cold || sc->sc_poll) flags |= I2C_F_POLL; if (!I2C_OP_STOP_P(op) || cmdlen > 1 || len > 2) return (1); /* Setup transfer */ sc->sc_i2c_xfer.op = op; sc->sc_i2c_xfer.buf = buf; sc->sc_i2c_xfer.len = len; sc->sc_i2c_xfer.flags = flags; sc->sc_i2c_xfer.error = 0; /* Set slave address and transfer direction */ bus_space_write_1(sc->sc_iot, sc->sc_ioh, ICH_SMB_TXSLVA, ICH_SMB_TXSLVA_ADDR(addr) | (I2C_OP_READ_P(op) ? ICH_SMB_TXSLVA_READ : 0)); b = (void *)cmdbuf; if (cmdlen > 0) /* Set command byte */ bus_space_write_1(sc->sc_iot, sc->sc_ioh, ICH_SMB_HCMD, b[0]); if (I2C_OP_WRITE_P(op)) { /* Write data */ b = buf; if (len > 0) bus_space_write_1(sc->sc_iot, sc->sc_ioh, ICH_SMB_HD0, b[0]); if (len > 1) bus_space_write_1(sc->sc_iot, sc->sc_ioh, ICH_SMB_HD1, b[1]); } /* Set SMBus command */ if (len == 0) ctl = ICH_SMB_HC_CMD_BYTE; else if (len == 1) ctl = ICH_SMB_HC_CMD_BDATA; else if (len == 2) ctl = ICH_SMB_HC_CMD_WDATA; if ((flags & I2C_F_POLL) == 0) ctl |= ICH_SMB_HC_INTREN; /* Start transaction */ ctl |= ICH_SMB_HC_START; bus_space_write_1(sc->sc_iot, sc->sc_ioh, ICH_SMB_HC, ctl); if (flags & I2C_F_POLL) { /* Poll for completion */ DELAY(ICHIIC_DELAY); for (retries = 1000; retries > 0; retries--) { st = bus_space_read_1(sc->sc_iot, sc->sc_ioh, ICH_SMB_HS); if ((st & ICH_SMB_HS_BUSY) == 0) break; DELAY(ICHIIC_DELAY); } if (st & ICH_SMB_HS_BUSY) goto timeout; ichiic_intr(sc); } else { /* Wait for interrupt */ if (tsleep(sc, PRIBIO, "iicexec", ICHIIC_TIMEOUT * hz)) goto timeout; } if (sc->sc_i2c_xfer.error) return (1); return (0); timeout: /* * Transfer timeout. Kill the transaction and clear status bits. */ bus_space_write_1(sc->sc_iot, sc->sc_ioh, ICH_SMB_HC, ICH_SMB_HC_KILL); DELAY(ICHIIC_DELAY); st = bus_space_read_1(sc->sc_iot, sc->sc_ioh, ICH_SMB_HS); if ((st & ICH_SMB_HS_FAILED) == 0) printf("%s: abort failed, status 0x%b\n", sc->sc_dev.dv_xname, st, ICH_SMB_HS_BITS); bus_space_write_1(sc->sc_iot, sc->sc_ioh, ICH_SMB_HS, st); return (1); } int ichiic_intr(void *arg) { struct ichiic_softc *sc = arg; u_int8_t st; u_int8_t *b; size_t len; /* Read status */ st = bus_space_read_1(sc->sc_iot, sc->sc_ioh, ICH_SMB_HS); if ((st & ICH_SMB_HS_BUSY) != 0 || (st & (ICH_SMB_HS_INTR | ICH_SMB_HS_DEVERR | ICH_SMB_HS_BUSERR | ICH_SMB_HS_FAILED | ICH_SMB_HS_SMBAL | ICH_SMB_HS_BDONE)) == 0) /* Interrupt was not for us */ return (0); DPRINTF(("%s: intr st 0x%b\n", sc->sc_dev.dv_xname, st, ICH_SMB_HS_BITS)); /* Clear status bits */ bus_space_write_1(sc->sc_iot, sc->sc_ioh, ICH_SMB_HS, st); /* Check for errors */ if (st & (ICH_SMB_HS_DEVERR | ICH_SMB_HS_BUSERR | ICH_SMB_HS_FAILED)) { sc->sc_i2c_xfer.error = 1; goto done; } if (st & ICH_SMB_HS_INTR) { if (I2C_OP_WRITE_P(sc->sc_i2c_xfer.op)) goto done; /* Read data */ b = sc->sc_i2c_xfer.buf; len = sc->sc_i2c_xfer.len; if (len > 0) b[0] = bus_space_read_1(sc->sc_iot, sc->sc_ioh, ICH_SMB_HD0); if (len > 1) b[1] = bus_space_read_1(sc->sc_iot, sc->sc_ioh, ICH_SMB_HD1); } done: if ((sc->sc_i2c_xfer.flags & I2C_F_POLL) == 0) wakeup(sc); return (1); }