Move amdsmb and nfsmb from dev/pci to their own device directory.

1 files changed, 657 insertions, 0 deletions

diff --git a/sys/dev/nfsmb/nfsmb.c b/sys/dev/nfsmb/nfsmb.c
new file mode 100644
index 000000000000..a178ae36235d
--- /dev/null
+++ b/sys/dev/nfsmb/nfsmb.c
@@ -0,0 +1,657 @@
+/*-
+ * Copyright (c) 2005 Ruslan Ermilov
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in the
+ *    documentation and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
+ * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
+ * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+ * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+ * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
+ * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+ * SUCH DAMAGE.
+ */
+
+#include <sys/cdefs.h>
+__FBSDID("$FreeBSD$");
+
+#include <sys/param.h>
+#include <sys/bus.h>
+#include <sys/kernel.h>
+#include <sys/lock.h>
+#include <sys/module.h>
+#include <sys/mutex.h>
+#include <sys/systm.h>
+
+#include <machine/bus.h>
+#include <machine/resource.h>
+#include <sys/rman.h>
+
+#include <dev/pci/pcivar.h>
+#include <dev/pci/pcireg.h>
+
+#include <dev/smbus/smbconf.h>
+#include "smbus_if.h"
+
+#define	NFSMB_DEBUG(x)	if (nfsmb_debug) (x)
+
+#ifdef DEBUG
+static int nfsmb_debug = 1;
+#else
+static int nfsmb_debug = 0;
+#endif
+
+/* NVIDIA nForce2/3/4 MCP */
+#define	NFSMB_VENDORID_NVIDIA		0x10de
+#define	NFSMB_DEVICEID_NF2_SMB		0x0064
+#define	NFSMB_DEVICEID_NF2_ULTRA_SMB	0x0084
+#define	NFSMB_DEVICEID_NF3_PRO150_SMB	0x00d4
+#define	NFSMB_DEVICEID_NF3_250GB_SMB	0x00e4
+#define	NFSMB_DEVICEID_NF4_SMB		0x0052
+#define	NFSMB_DEVICEID_NF4_04_SMB	0x0034
+#define	NFSMB_DEVICEID_NF4_51_SMB	0x0264
+#define	NFSMB_DEVICEID_NF4_55_SMB	0x0368
+#define	NFSMB_DEVICEID_NF4_61_SMB	0x03eb
+#define	NFSMB_DEVICEID_NF4_65_SMB	0x0446
+#define	NFSMB_DEVICEID_NF4_67_SMB	0x0542
+#define	NFSMB_DEVICEID_NF4_73_SMB	0x07d8
+#define	NFSMB_DEVICEID_NF4_78S_SMB	0x0752
+#define	NFSMB_DEVICEID_NF4_79_SMB	0x0aa2
+
+/* PCI Configuration space registers */
+#define	NF2PCI_SMBASE_1		PCIR_BAR(4)
+#define	NF2PCI_SMBASE_2		PCIR_BAR(5)
+
+/*
+ * ACPI 3.0, Chapter 12, SMBus Host Controller Interface.
+ */
+#define	SMB_PRTCL		0x00	/* protocol */
+#define	SMB_STS			0x01	/* status */
+#define	SMB_ADDR		0x02	/* address */
+#define	SMB_CMD			0x03	/* command */
+#define	SMB_DATA		0x04	/* 32 data registers */
+#define	SMB_BCNT		0x24	/* number of data bytes */
+#define	SMB_ALRM_A		0x25	/* alarm address */
+#define	SMB_ALRM_D		0x26	/* 2 bytes alarm data */
+
+#define	SMB_STS_DONE		0x80
+#define	SMB_STS_ALRM		0x40
+#define	SMB_STS_RES		0x20
+#define	SMB_STS_STATUS		0x1f
+#define	SMB_STS_OK		0x00	/* OK */
+#define	SMB_STS_UF		0x07	/* Unknown Failure */
+#define	SMB_STS_DANA		0x10	/* Device Address Not Acknowledged */
+#define	SMB_STS_DED		0x11	/* Device Error Detected */
+#define	SMB_STS_DCAD		0x12	/* Device Command Access Denied */
+#define	SMB_STS_UE		0x13	/* Unknown Error */
+#define	SMB_STS_DAD		0x17	/* Device Access Denied */
+#define	SMB_STS_T		0x18	/* Timeout */
+#define	SMB_STS_HUP		0x19	/* Host Unsupported Protocol */
+#define	SMB_STS_B		0x1A	/* Busy */
+#define	SMB_STS_PEC		0x1F	/* PEC (CRC-8) Error */
+
+#define	SMB_PRTCL_WRITE		0x00
+#define	SMB_PRTCL_READ		0x01
+#define	SMB_PRTCL_QUICK		0x02
+#define	SMB_PRTCL_BYTE		0x04
+#define	SMB_PRTCL_BYTE_DATA	0x06
+#define	SMB_PRTCL_WORD_DATA	0x08
+#define	SMB_PRTCL_BLOCK_DATA	0x0a
+#define	SMB_PRTCL_PROC_CALL	0x0c
+#define	SMB_PRTCL_BLOCK_PROC_CALL 0x0d
+#define	SMB_PRTCL_PEC		0x80
+
+struct nfsmb_softc {
+	int rid;
+	struct resource *res;
+	device_t smbus;
+	device_t subdev;
+	struct mtx lock;
+};
+
+#define	NFSMB_LOCK(nfsmb)		mtx_lock(&(nfsmb)->lock)
+#define	NFSMB_UNLOCK(nfsmb)		mtx_unlock(&(nfsmb)->lock)
+#define	NFSMB_LOCK_ASSERT(nfsmb)	mtx_assert(&(nfsmb)->lock, MA_OWNED)
+
+#define	NFSMB_SMBINB(nfsmb, register)					\
+	(bus_read_1(nfsmb->res, register))
+#define	NFSMB_SMBOUTB(nfsmb, register, value) \
+	(bus_write_1(nfsmb->res, register, value))
+
+static int	nfsmb_detach(device_t dev);
+static int	nfsmbsub_detach(device_t dev);
+
+static int
+nfsmbsub_probe(device_t dev)
+{
+
+	device_set_desc(dev, "nForce2/3/4 MCP SMBus Controller");
+	return (BUS_PROBE_DEFAULT);
+}
+
+static int
+nfsmb_probe(device_t dev)
+{
+	u_int16_t vid;
+	u_int16_t did;
+
+	vid = pci_get_vendor(dev);
+	did = pci_get_device(dev);
+
+	if (vid == NFSMB_VENDORID_NVIDIA) {
+		switch(did) {
+		case NFSMB_DEVICEID_NF2_SMB:
+		case NFSMB_DEVICEID_NF2_ULTRA_SMB:
+		case NFSMB_DEVICEID_NF3_PRO150_SMB:
+		case NFSMB_DEVICEID_NF3_250GB_SMB:
+		case NFSMB_DEVICEID_NF4_SMB:
+		case NFSMB_DEVICEID_NF4_04_SMB:
+		case NFSMB_DEVICEID_NF4_51_SMB:
+		case NFSMB_DEVICEID_NF4_55_SMB:
+		case NFSMB_DEVICEID_NF4_61_SMB:
+		case NFSMB_DEVICEID_NF4_65_SMB:
+		case NFSMB_DEVICEID_NF4_67_SMB:
+		case NFSMB_DEVICEID_NF4_73_SMB:
+		case NFSMB_DEVICEID_NF4_78S_SMB:
+		case NFSMB_DEVICEID_NF4_79_SMB:
+			device_set_desc(dev, "nForce2/3/4 MCP SMBus Controller");
+			return (BUS_PROBE_DEFAULT);
+		}
+	}
+
+	return (ENXIO);
+}
+
+static int
+nfsmbsub_attach(device_t dev)
+{
+	device_t parent;
+	struct nfsmb_softc *nfsmbsub_sc = device_get_softc(dev);
+
+	parent = device_get_parent(dev);
+
+	nfsmbsub_sc->rid = NF2PCI_SMBASE_2;
+
+	nfsmbsub_sc->res = bus_alloc_resource_any(parent, SYS_RES_IOPORT,
+	    &nfsmbsub_sc->rid, RF_ACTIVE);
+	if (nfsmbsub_sc->res == NULL) {
+		/* Older incarnations of the device used non-standard BARs. */
+		nfsmbsub_sc->rid = 0x54;
+		nfsmbsub_sc->res = bus_alloc_resource_any(parent,
+		    SYS_RES_IOPORT, &nfsmbsub_sc->rid, RF_ACTIVE);
+		if (nfsmbsub_sc->res == NULL) {
+			device_printf(dev, "could not map i/o space\n");
+			return (ENXIO);
+		}
+	}
+	mtx_init(&nfsmbsub_sc->lock, device_get_nameunit(dev), "nfsmb",
+	    MTX_DEF);
+
+	nfsmbsub_sc->smbus = device_add_child(dev, "smbus", -1);
+	if (nfsmbsub_sc->smbus == NULL) {
+		nfsmbsub_detach(dev);
+		return (EINVAL);
+	}
+
+	bus_generic_attach(dev);
+
+	return (0);
+}
+
+static int
+nfsmb_attach(device_t dev)
+{
+	struct nfsmb_softc *nfsmb_sc = device_get_softc(dev);
+
+	/* Allocate I/O space */
+	nfsmb_sc->rid = NF2PCI_SMBASE_1;
+
+	nfsmb_sc->res = bus_alloc_resource_any(dev, SYS_RES_IOPORT,
+		&nfsmb_sc->rid, RF_ACTIVE);
+
+	if (nfsmb_sc->res == NULL) {
+		/* Older incarnations of the device used non-standard BARs. */
+		nfsmb_sc->rid = 0x50;
+		nfsmb_sc->res = bus_alloc_resource_any(dev,
+		    SYS_RES_IOPORT, &nfsmb_sc->rid, RF_ACTIVE);
+		if (nfsmb_sc->res == NULL) {
+			device_printf(dev, "could not map i/o space\n");
+			return (ENXIO);
+		}
+	}
+
+	mtx_init(&nfsmb_sc->lock, device_get_nameunit(dev), "nfsmb", MTX_DEF);
+
+	/* Allocate a new smbus device */
+	nfsmb_sc->smbus = device_add_child(dev, "smbus", -1);
+	if (!nfsmb_sc->smbus) {
+		nfsmb_detach(dev);
+		return (EINVAL);
+	}
+
+	nfsmb_sc->subdev = NULL;
+	switch (pci_get_device(dev)) {
+	case NFSMB_DEVICEID_NF2_SMB:
+	case NFSMB_DEVICEID_NF2_ULTRA_SMB:
+	case NFSMB_DEVICEID_NF3_PRO150_SMB:
+	case NFSMB_DEVICEID_NF3_250GB_SMB:
+	case NFSMB_DEVICEID_NF4_SMB:
+	case NFSMB_DEVICEID_NF4_04_SMB:
+	case NFSMB_DEVICEID_NF4_51_SMB:
+	case NFSMB_DEVICEID_NF4_55_SMB:
+	case NFSMB_DEVICEID_NF4_61_SMB:
+	case NFSMB_DEVICEID_NF4_65_SMB:
+	case NFSMB_DEVICEID_NF4_67_SMB:
+	case NFSMB_DEVICEID_NF4_73_SMB:
+	case NFSMB_DEVICEID_NF4_78S_SMB:
+	case NFSMB_DEVICEID_NF4_79_SMB:
+		/* Trying to add secondary device as slave */
+		nfsmb_sc->subdev = device_add_child(dev, "nfsmb", -1);
+		if (!nfsmb_sc->subdev) {
+			nfsmb_detach(dev);
+			return (EINVAL);
+		}
+		break;
+	default:
+		break;
+	}
+
+	bus_generic_attach(dev);
+
+	return (0);
+}
+
+static int
+nfsmbsub_detach(device_t dev)
+{
+	device_t parent;
+	struct nfsmb_softc *nfsmbsub_sc = device_get_softc(dev);
+
+	parent = device_get_parent(dev);
+
+	if (nfsmbsub_sc->smbus) {
+		device_delete_child(dev, nfsmbsub_sc->smbus);
+		nfsmbsub_sc->smbus = NULL;
+	}
+	mtx_destroy(&nfsmbsub_sc->lock);
+	if (nfsmbsub_sc->res) {
+		bus_release_resource(parent, SYS_RES_IOPORT, nfsmbsub_sc->rid,
+		    nfsmbsub_sc->res);
+		nfsmbsub_sc->res = NULL;
+	}
+	return (0);
+}
+
+static int
+nfsmb_detach(device_t dev)
+{
+	struct nfsmb_softc *nfsmb_sc = device_get_softc(dev);
+
+	if (nfsmb_sc->subdev) {
+		device_delete_child(dev, nfsmb_sc->subdev);
+		nfsmb_sc->subdev = NULL;
+	}
+
+	if (nfsmb_sc->smbus) {
+		device_delete_child(dev, nfsmb_sc->smbus);
+		nfsmb_sc->smbus = NULL;
+	}
+
+	mtx_destroy(&nfsmb_sc->lock);
+	if (nfsmb_sc->res) {
+		bus_release_resource(dev, SYS_RES_IOPORT, nfsmb_sc->rid,
+		    nfsmb_sc->res);
+		nfsmb_sc->res = NULL;
+	}
+
+	return (0);
+}
+
+static int
+nfsmb_callback(device_t dev, int index, void *data)
+{
+	int error = 0;
+
+	switch (index) {
+	case SMB_REQUEST_BUS:
+	case SMB_RELEASE_BUS:
+		break;
+	default:
+		error = EINVAL;
+	}
+
+	return (error);
+}
+
+static int
+nfsmb_wait(struct nfsmb_softc *sc)
+{
+	u_char sts;
+	int error, count;
+
+	NFSMB_LOCK_ASSERT(sc);
+	if (NFSMB_SMBINB(sc, SMB_PRTCL) != 0)
+	{
+		count = 10000;
+		do {
+			DELAY(500);
+		} while (NFSMB_SMBINB(sc, SMB_PRTCL) != 0 && count--);
+		if (count == 0)
+			return (SMB_ETIMEOUT);
+	}
+
+	sts = NFSMB_SMBINB(sc, SMB_STS) & SMB_STS_STATUS;
+	NFSMB_DEBUG(printf("nfsmb: STS=0x%x\n", sts));
+
+	switch (sts) {
+	case SMB_STS_OK:
+		error = SMB_ENOERR;
+		break;
+	case SMB_STS_DANA:
+		error = SMB_ENOACK;
+		break;
+	case SMB_STS_B:
+		error = SMB_EBUSY;
+		break;
+	case SMB_STS_T:
+		error = SMB_ETIMEOUT;
+		break;
+	case SMB_STS_DCAD:
+	case SMB_STS_DAD:
+	case SMB_STS_HUP:
+		error = SMB_ENOTSUPP;
+		break;
+	default:
+		error = SMB_EBUSERR;
+		break;
+	}
+
+	return (error);
+}
+
+static int
+nfsmb_quick(device_t dev, u_char slave, int how)
+{
+	struct nfsmb_softc *sc = (struct nfsmb_softc *)device_get_softc(dev);
+	u_char protocol;
+	int error;
+
+	protocol = SMB_PRTCL_QUICK;
+
+	switch (how) {
+	case SMB_QWRITE:
+		protocol |= SMB_PRTCL_WRITE;
+		NFSMB_DEBUG(printf("nfsmb: QWRITE to 0x%x", slave));
+		break;
+	case SMB_QREAD:
+		protocol |= SMB_PRTCL_READ;
+		NFSMB_DEBUG(printf("nfsmb: QREAD to 0x%x", slave));
+		break;
+	default:
+		panic("%s: unknown QUICK command (%x)!", __func__, how);
+	}
+
+	NFSMB_LOCK(sc);
+	NFSMB_SMBOUTB(sc, SMB_ADDR, slave);
+	NFSMB_SMBOUTB(sc, SMB_PRTCL, protocol);
+
+	error = nfsmb_wait(sc);
+
+	NFSMB_DEBUG(printf(", error=0x%x\n", error));
+	NFSMB_UNLOCK(sc);
+
+	return (error);
+}
+
+static int
+nfsmb_sendb(device_t dev, u_char slave, char byte)
+{
+	struct nfsmb_softc *sc = (struct nfsmb_softc *)device_get_softc(dev);
+	int error;
+
+	NFSMB_LOCK(sc);
+	NFSMB_SMBOUTB(sc, SMB_CMD, byte);
+	NFSMB_SMBOUTB(sc, SMB_ADDR, slave);
+	NFSMB_SMBOUTB(sc, SMB_PRTCL, SMB_PRTCL_WRITE | SMB_PRTCL_BYTE);
+
+	error = nfsmb_wait(sc);
+
+	NFSMB_DEBUG(printf("nfsmb: SENDB to 0x%x, byte=0x%x, error=0x%x\n", slave, byte, error));
+	NFSMB_UNLOCK(sc);
+
+	return (error);
+}
+
+static int
+nfsmb_recvb(device_t dev, u_char slave, char *byte)
+{
+	struct nfsmb_softc *sc = (struct nfsmb_softc *)device_get_softc(dev);
+	int error;
+
+	NFSMB_LOCK(sc);
+	NFSMB_SMBOUTB(sc, SMB_ADDR, slave);
+	NFSMB_SMBOUTB(sc, SMB_PRTCL, SMB_PRTCL_READ | SMB_PRTCL_BYTE);
+
+	if ((error = nfsmb_wait(sc)) == SMB_ENOERR)
+		*byte = NFSMB_SMBINB(sc, SMB_DATA);
+
+	NFSMB_DEBUG(printf("nfsmb: RECVB from 0x%x, byte=0x%x, error=0x%x\n", slave, *byte, error));
+	NFSMB_UNLOCK(sc);
+
+	return (error);
+}
+
+static int
+nfsmb_writeb(device_t dev, u_char slave, char cmd, char byte)
+{
+	struct nfsmb_softc *sc = (struct nfsmb_softc *)device_get_softc(dev);
+	int error;
+
+	NFSMB_LOCK(sc);
+	NFSMB_SMBOUTB(sc, SMB_CMD, cmd);
+	NFSMB_SMBOUTB(sc, SMB_DATA, byte);
+	NFSMB_SMBOUTB(sc, SMB_ADDR, slave);
+	NFSMB_SMBOUTB(sc, SMB_PRTCL, SMB_PRTCL_WRITE | SMB_PRTCL_BYTE_DATA);
+
+	error = nfsmb_wait(sc);
+
+	NFSMB_DEBUG(printf("nfsmb: WRITEB to 0x%x, cmd=0x%x, byte=0x%x, error=0x%x\n", slave, cmd, byte, error));
+	NFSMB_UNLOCK(sc);
+
+	return (error);
+}
+
+static int
+nfsmb_readb(device_t dev, u_char slave, char cmd, char *byte)
+{
+	struct nfsmb_softc *sc = (struct nfsmb_softc *)device_get_softc(dev);
+	int error;
+
+	NFSMB_LOCK(sc);
+	NFSMB_SMBOUTB(sc, SMB_CMD, cmd);
+	NFSMB_SMBOUTB(sc, SMB_ADDR, slave);
+	NFSMB_SMBOUTB(sc, SMB_PRTCL, SMB_PRTCL_READ | SMB_PRTCL_BYTE_DATA);
+
+	if ((error = nfsmb_wait(sc)) == SMB_ENOERR)
+		*byte = NFSMB_SMBINB(sc, SMB_DATA);
+
+	NFSMB_DEBUG(printf("nfsmb: READB from 0x%x, cmd=0x%x, byte=0x%x, error=0x%x\n", slave, cmd, (unsigned char)*byte, error));
+	NFSMB_UNLOCK(sc);
+
+	return (error);
+}
+
+static int
+nfsmb_writew(device_t dev, u_char slave, char cmd, short word)
+{
+	struct nfsmb_softc *sc = (struct nfsmb_softc *)device_get_softc(dev);
+	int error;
+
+	NFSMB_LOCK(sc);
+	NFSMB_SMBOUTB(sc, SMB_CMD, cmd);
+	NFSMB_SMBOUTB(sc, SMB_DATA, word);
+	NFSMB_SMBOUTB(sc, SMB_DATA + 1, word >> 8);
+	NFSMB_SMBOUTB(sc, SMB_ADDR, slave);
+	NFSMB_SMBOUTB(sc, SMB_PRTCL, SMB_PRTCL_WRITE | SMB_PRTCL_WORD_DATA);
+
+	error = nfsmb_wait(sc);
+
+	NFSMB_DEBUG(printf("nfsmb: WRITEW to 0x%x, cmd=0x%x, word=0x%x, error=0x%x\n", slave, cmd, word, error));
+	NFSMB_UNLOCK(sc);
+
+	return (error);
+}
+
+static int
+nfsmb_readw(device_t dev, u_char slave, char cmd, short *word)
+{
+	struct nfsmb_softc *sc = (struct nfsmb_softc *)device_get_softc(dev);
+	int error;
+
+	NFSMB_LOCK(sc);
+	NFSMB_SMBOUTB(sc, SMB_CMD, cmd);
+	NFSMB_SMBOUTB(sc, SMB_ADDR, slave);
+	NFSMB_SMBOUTB(sc, SMB_PRTCL, SMB_PRTCL_READ | SMB_PRTCL_WORD_DATA);
+
+	if ((error = nfsmb_wait(sc)) == SMB_ENOERR)
+		*word = NFSMB_SMBINB(sc, SMB_DATA) |
+		    (NFSMB_SMBINB(sc, SMB_DATA + 1) << 8);
+
+	NFSMB_DEBUG(printf("nfsmb: READW from 0x%x, cmd=0x%x, word=0x%x, error=0x%x\n", slave, cmd, (unsigned short)*word, error));
+	NFSMB_UNLOCK(sc);
+
+	return (error);
+}
+
+static int
+nfsmb_bwrite(device_t dev, u_char slave, char cmd, u_char count, char *buf)
+{
+	struct nfsmb_softc *sc = (struct nfsmb_softc *)device_get_softc(dev);
+	u_char i;
+	int error;
+
+	if (count < 1 || count > 32)
+		return (SMB_EINVAL);
+
+	NFSMB_LOCK(sc);
+	NFSMB_SMBOUTB(sc, SMB_CMD, cmd);
+	NFSMB_SMBOUTB(sc, SMB_BCNT, count);
+	for (i = 0; i < count; i++)
+		NFSMB_SMBOUTB(sc, SMB_DATA + i, buf[i]);
+	NFSMB_SMBOUTB(sc, SMB_ADDR, slave);
+	NFSMB_SMBOUTB(sc, SMB_PRTCL, SMB_PRTCL_WRITE | SMB_PRTCL_BLOCK_DATA);
+
+	error = nfsmb_wait(sc);
+
+	NFSMB_DEBUG(printf("nfsmb: WRITEBLK to 0x%x, count=0x%x, cmd=0x%x, error=0x%x", slave, count, cmd, error));
+	NFSMB_UNLOCK(sc);
+
+	return (error);
+}
+
+static int
+nfsmb_bread(device_t dev, u_char slave, char cmd, u_char *count, char *buf)
+{
+	struct nfsmb_softc *sc = (struct nfsmb_softc *)device_get_softc(dev);
+	u_char data, len, i;
+	int error;
+
+	if (*count < 1 || *count > 32)
+		return (SMB_EINVAL);
+
+	NFSMB_LOCK(sc);
+	NFSMB_SMBOUTB(sc, SMB_CMD, cmd);
+	NFSMB_SMBOUTB(sc, SMB_ADDR, slave);
+	NFSMB_SMBOUTB(sc, SMB_PRTCL, SMB_PRTCL_READ | SMB_PRTCL_BLOCK_DATA);
+
+	if ((error = nfsmb_wait(sc)) == SMB_ENOERR) {
+		len = NFSMB_SMBINB(sc, SMB_BCNT);
+		for (i = 0; i < len; i++) {
+			data = NFSMB_SMBINB(sc, SMB_DATA + i);
+			if (i < *count)
+				buf[i] = data;
+		}
+		*count = len;
+	}
+
+	NFSMB_DEBUG(printf("nfsmb: READBLK to 0x%x, count=0x%x, cmd=0x%x, error=0x%x", slave, *count, cmd, error));
+	NFSMB_UNLOCK(sc);
+
+	return (error);
+}
+
+static device_method_t nfsmb_methods[] = {
+	/* Device interface */
+	DEVMETHOD(device_probe,		nfsmb_probe),
+	DEVMETHOD(device_attach,	nfsmb_attach),
+	DEVMETHOD(device_detach,	nfsmb_detach),
+
+	/* SMBus interface */
+	DEVMETHOD(smbus_callback,	nfsmb_callback),
+	DEVMETHOD(smbus_quick,		nfsmb_quick),
+	DEVMETHOD(smbus_sendb,		nfsmb_sendb),
+	DEVMETHOD(smbus_recvb,		nfsmb_recvb),
+	DEVMETHOD(smbus_writeb,		nfsmb_writeb),
+	DEVMETHOD(smbus_readb,		nfsmb_readb),
+	DEVMETHOD(smbus_writew,		nfsmb_writew),
+	DEVMETHOD(smbus_readw,		nfsmb_readw),
+	DEVMETHOD(smbus_bwrite,		nfsmb_bwrite),
+	DEVMETHOD(smbus_bread,		nfsmb_bread),
+
+	{ 0, 0 }
+};
+
+static device_method_t nfsmbsub_methods[] = {
+	/* Device interface */
+	DEVMETHOD(device_probe,		nfsmbsub_probe),
+	DEVMETHOD(device_attach,	nfsmbsub_attach),
+	DEVMETHOD(device_detach,	nfsmbsub_detach),
+
+	/* SMBus interface */
+	DEVMETHOD(smbus_callback,	nfsmb_callback),
+	DEVMETHOD(smbus_quick,		nfsmb_quick),
+	DEVMETHOD(smbus_sendb,		nfsmb_sendb),
+	DEVMETHOD(smbus_recvb,		nfsmb_recvb),
+	DEVMETHOD(smbus_writeb,		nfsmb_writeb),
+	DEVMETHOD(smbus_readb,		nfsmb_readb),
+	DEVMETHOD(smbus_writew,		nfsmb_writew),
+	DEVMETHOD(smbus_readw,		nfsmb_readw),
+	DEVMETHOD(smbus_bwrite,		nfsmb_bwrite),
+	DEVMETHOD(smbus_bread,		nfsmb_bread),
+
+	{ 0, 0 }
+};
+
+static devclass_t nfsmb_devclass;
+
+static driver_t nfsmb_driver = {
+	"nfsmb",
+	nfsmb_methods,
+	sizeof(struct nfsmb_softc),
+};
+
+static driver_t nfsmbsub_driver = {
+	"nfsmb",
+	nfsmbsub_methods,
+	sizeof(struct nfsmb_softc),
+};
+
+DRIVER_MODULE(nfsmb, pci, nfsmb_driver, nfsmb_devclass, 0, 0);
+DRIVER_MODULE(nfsmb, nfsmb, nfsmbsub_driver, nfsmb_devclass, 0, 0);
+DRIVER_MODULE(smbus, nfsmb, smbus_driver, smbus_devclass, 0, 0);
+
+MODULE_DEPEND(nfsmb, pci, 1, 1, 1);
+MODULE_DEPEND(nfsmb, smbus, SMBUS_MINVER, SMBUS_PREFVER, SMBUS_MAXVER);
+MODULE_VERSION(nfsmb, 1);