/* $OpenBSD: viapm.c,v 1.9 2008/02/17 21:29:48 brad Exp $ */ /* * Copyright (c) 2005 Mark Kettenis <kettenis@openbsd.org> * * 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. */ /* * VIA VT8237 SMBus controller driver. */ #include <sys/param.h> #include <sys/systm.h> #include <sys/device.h> #include <sys/kernel.h> #include <sys/rwlock.h> #include <sys/proc.h> #include <machine/bus.h> #include <dev/pci/pcidevs.h> #include <dev/pci/pcireg.h> #include <dev/pci/pcivar.h> #include <dev/i2c/i2cvar.h> /* * VIA VT8237 ISA register definitions. */ /* PCI configuration registers */ #define VIAPM_SMB_BASE 0xd0 /* SMBus base address */ #define VIAPM_SMB_HOSTC 0xd2 /* host configuration */ #define VIAPM_SMB_HOSTC_HSTEN (1 << 0) /* enable host controller */ #define VIAPM_SMB_HOSTC_INTEN (1 << 1) /* enable SCI/SMI */ #define VIAPM_SMB_HOSTC_SCIEN (1 << 3) /* interrupt type (SCI/SMI) */ /* SMBus I/O registers */ #define VIAPM_SMB_HS 0x00 /* host status */ #define VIAPM_SMB_HS_BUSY (1 << 0) /* running a command */ #define VIAPM_SMB_HS_INTR (1 << 1) /* command completed */ #define VIAPM_SMB_HS_DEVERR (1 << 2) /* command error */ #define VIAPM_SMB_HS_BUSERR (1 << 3) /* transaction collision */ #define VIAPM_SMB_HS_FAILED (1 << 4) /* failed bus transaction */ #define VIAPM_SMB_HS_INUSE (1 << 6) /* bus semaphore */ #define VIAPM_SMB_HS_BITS \ "\020\001BUSY\002INTR\003DEVERR\004BUSERR\005FAILED\007INUSE" #define VIAPM_SMB_HC 0x02 /* host control */ #define VIAPM_SMB_HC_INTREN (1 << 0) /* enable interrupts */ #define VIAPM_SMB_HC_KILL (1 << 1) /* kill current transaction */ #define VIAPM_SMB_HC_CMD_QUICK (0 << 2) /* QUICK command */ #define VIAPM_SMB_HC_CMD_BYTE (1 << 2) /* BYTE command */ #define VIAPM_SMB_HC_CMD_BDATA (2 << 2) /* BYTE DATA command */ #define VIAPM_SMB_HC_CMD_WDATA (3 << 2) /* WORD DATA command */ #define VIAPM_SMB_HC_CMD_PCALL (4 << 2) /* PROCESS CALL command */ #define VIAPM_SMB_HC_CMD_BLOCK (5 << 2) /* BLOCK command */ #define VIAPM_SMB_HC_START (1 << 6) /* start transaction */ #define VIAPM_SMB_HCMD 0x03 /* host command */ #define VIAPM_SMB_TXSLVA 0x04 /* transmit slave address */ #define VIAPM_SMB_TXSLVA_READ (1 << 0) /* read direction */ #define VIAPM_SMB_TXSLVA_ADDR(x) (((x) & 0x7f) << 1) /* 7-bit address */ #define VIAPM_SMB_HD0 0x05 /* host data 0 */ #define VIAPM_SMB_HD1 0x06 /* host data 1 */ #define VIAPM_SMB_HBDB 0x07 /* host block data byte */ #define VIAPM_SMB_SIZE 16 #ifdef VIAPM_DEBUG #define DPRINTF(x) printf x #else #define DPRINTF(x) #endif #define VIAPM_DELAY 100 #define VIAPM_TIMEOUT 1 struct viapm_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 viapm_match(struct device *, void *, void *); void viapm_attach(struct device *, struct device *, void *); int viapm_i2c_acquire_bus(void *, int); void viapm_i2c_release_bus(void *, int); int viapm_i2c_exec(void *, i2c_op_t, i2c_addr_t, const void *, size_t, void *, size_t, int); int viapm_intr(void *); struct cfattach viapm_ca = { sizeof(struct viapm_softc), viapm_match, viapm_attach }; struct cfdriver viapm_cd = { NULL, "viapm", DV_DULL }; const struct pci_matchid viapm_ids[] = { { PCI_VENDOR_VIATECH, PCI_PRODUCT_VIATECH_VT8233_ISA }, { PCI_VENDOR_VIATECH, PCI_PRODUCT_VIATECH_VT8233A_ISA }, { PCI_VENDOR_VIATECH, PCI_PRODUCT_VIATECH_VT8235_ISA }, { PCI_VENDOR_VIATECH, PCI_PRODUCT_VIATECH_VT8237_ISA }, { PCI_VENDOR_VIATECH, PCI_PRODUCT_VIATECH_VT8237A_ISA }, { PCI_VENDOR_VIATECH, PCI_PRODUCT_VIATECH_VT8237S_ISA }, { PCI_VENDOR_VIATECH, PCI_PRODUCT_VIATECH_VT8251_ISA }, { PCI_VENDOR_VIATECH, PCI_PRODUCT_VIATECH_CX700_ISA } }; int viapm_match(struct device *parent, void *match, void *aux) { return (pci_matchbyid(aux, viapm_ids, sizeof(viapm_ids) / sizeof(viapm_ids[0]))); } void viapm_attach(struct device *parent, struct device *self, void *aux) { struct viapm_softc *sc = (struct viapm_softc *)self; struct pci_attach_args *pa = aux; struct i2cbus_attach_args iba; pcireg_t conf, iobase; #if 0 pci_intr_handle_t ih; const char *intrstr = NULL; #endif /* Map I/O space */ sc->sc_iot = pa->pa_iot; iobase = pci_conf_read(pa->pa_pc, pa->pa_tag, VIAPM_SMB_BASE); if (iobase == 0 || bus_space_map(sc->sc_iot, iobase & 0xfffe, VIAPM_SMB_SIZE, 0, &sc->sc_ioh)) { printf(": can't map I/O space\n"); return; } /* Read configuration */ conf = (iobase >> 16); DPRINTF((": conf 0x%x", conf)); if ((conf & VIAPM_SMB_HOSTC_HSTEN) == 0) { printf(": SMBus host disabled\n"); goto fail; } if (conf & VIAPM_SMB_HOSTC_INTEN) { if (conf & VIAPM_SMB_HOSTC_SCIEN) printf(": SCI"); else printf(": SMI"); sc->sc_poll = 1; } else { #if 0 /* Install interrupt handler */ if (pci_intr_map(pa, &ih)) { printf(": can't map interrupt\n"); goto fail; } intrstr = pci_intr_string(pa->pa_pc, ih); sc->sc_ih = pci_intr_establish(pa->pa_pc, ih, IPL_BIO, viapm_intr, sc, sc->sc_dev.dv_xname); if (sc->sc_ih == NULL) { printf(": can't establish interrupt"); if (intrstr != NULL) printf(" at %s", intrstr); printf("\n"); goto fail; } printf(": %s", intrstr); #endif sc->sc_poll = 1; } 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 = viapm_i2c_acquire_bus; sc->sc_i2c_tag.ic_release_bus = viapm_i2c_release_bus; sc->sc_i2c_tag.ic_exec = viapm_i2c_exec; bzero(&iba, sizeof iba); iba.iba_name = "iic"; iba.iba_tag = &sc->sc_i2c_tag; config_found(self, &iba, iicbus_print); return; fail: bus_space_unmap(sc->sc_iot, sc->sc_ioh, VIAPM_SMB_SIZE); } int viapm_i2c_acquire_bus(void *cookie, int flags) { struct viapm_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 viapm_i2c_release_bus(void *cookie, int flags) { struct viapm_softc *sc = cookie; if (cold || sc->sc_poll || (flags & I2C_F_POLL)) return; rw_exit(&sc->sc_i2c_lock); } int viapm_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 viapm_softc *sc = cookie; u_int8_t *b; u_int8_t ctl, st; int retries; DPRINTF(("%s: exec op %d, addr 0x%x, cmdlen %d, len %d, " "flags 0x%x, status 0x%b\n", sc->sc_dev.dv_xname, op, addr, cmdlen, len, flags, bus_space_read_1(sc->sc_iot, sc->sc_ioh, VIAPM_SMB_HS), VIAPM_SMB_HS_BITS)); /* Check if there's a transfer already running */ st = bus_space_read_1(sc->sc_iot, sc->sc_ioh, VIAPM_SMB_HS); DPRINTF(("%s: exec: st 0x%b\n", sc->sc_dev.dv_xname, st, VIAPM_SMB_HS_BITS)); if (st & VIAPM_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, VIAPM_SMB_TXSLVA, VIAPM_SMB_TXSLVA_ADDR(addr) | (I2C_OP_READ_P(op) ? VIAPM_SMB_TXSLVA_READ : 0)); b = (void *)cmdbuf; if (cmdlen > 0) /* Set command byte */ bus_space_write_1(sc->sc_iot, sc->sc_ioh, VIAPM_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, VIAPM_SMB_HD0, b[0]); if (len > 1) bus_space_write_1(sc->sc_iot, sc->sc_ioh, VIAPM_SMB_HD1, b[1]); } /* Set SMBus command */ if (len == 0) ctl = VIAPM_SMB_HC_CMD_BYTE; else if (len == 1) ctl = VIAPM_SMB_HC_CMD_BDATA; else if (len == 2) ctl = VIAPM_SMB_HC_CMD_WDATA; if ((flags & I2C_F_POLL) == 0) ctl |= VIAPM_SMB_HC_INTREN; /* Start transaction */ ctl |= VIAPM_SMB_HC_START; bus_space_write_1(sc->sc_iot, sc->sc_ioh, VIAPM_SMB_HC, ctl); if (flags & I2C_F_POLL) { /* Poll for completion */ DELAY(VIAPM_DELAY); for (retries = 1000; retries > 0; retries--) { st = bus_space_read_1(sc->sc_iot, sc->sc_ioh, VIAPM_SMB_HS); if ((st & VIAPM_SMB_HS_BUSY) == 0) break; DELAY(VIAPM_DELAY); } if (st & VIAPM_SMB_HS_BUSY) goto timeout; viapm_intr(sc); } else { /* Wait for interrupt */ if (tsleep(sc, PRIBIO, "iicexec", VIAPM_TIMEOUT * hz)) goto timeout; } if (sc->sc_i2c_xfer.error) return (1); return (0); timeout: /* * Transfer timeout. Kill the transaction and clear status bits. */ printf("%s: timeout, status 0x%b\n", sc->sc_dev.dv_xname, st, VIAPM_SMB_HS_BITS); bus_space_write_1(sc->sc_iot, sc->sc_ioh, VIAPM_SMB_HC, VIAPM_SMB_HC_KILL); DELAY(VIAPM_DELAY); st = bus_space_read_1(sc->sc_iot, sc->sc_ioh, VIAPM_SMB_HS); if ((st & VIAPM_SMB_HS_FAILED) == 0) printf("%s: transaction abort failed, status 0x%b\n", sc->sc_dev.dv_xname, st, VIAPM_SMB_HS_BITS); bus_space_write_1(sc->sc_iot, sc->sc_ioh, VIAPM_SMB_HS, st); return (1); } int viapm_intr(void *arg) { struct viapm_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, VIAPM_SMB_HS); if ((st & VIAPM_SMB_HS_BUSY) != 0 || (st & (VIAPM_SMB_HS_INTR | VIAPM_SMB_HS_DEVERR | VIAPM_SMB_HS_BUSERR | VIAPM_SMB_HS_FAILED)) == 0) /* Interrupt was not for us */ return (0); DPRINTF(("%s: intr st 0x%b\n", sc->sc_dev.dv_xname, st, VIAPM_SMB_HS_BITS)); /* Clear status bits */ bus_space_write_1(sc->sc_iot, sc->sc_ioh, VIAPM_SMB_HS, st); /* Check for errors */ if (st & (VIAPM_SMB_HS_DEVERR | VIAPM_SMB_HS_BUSERR | VIAPM_SMB_HS_FAILED)) { sc->sc_i2c_xfer.error = 1; goto done; } if (st & VIAPM_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, VIAPM_SMB_HD0); if (len > 1) b[1] = bus_space_read_1(sc->sc_iot, sc->sc_ioh, VIAPM_SMB_HD1); } done: if ((sc->sc_i2c_xfer.flags & I2C_F_POLL) == 0) wakeup(sc); return (1); }