--- /dev/null
+/*
+ i2c-viapro.c - Part of lm_sensors, Linux kernel modules for hardware
+ monitoring
+ Copyright (c) 1998 - 2002 Frodo Looijaard <frodol@dds.nl>,
+ Philip Edelbrock <phil@netroedge.com>, Kyösti Mälkki <kmalkki@cc.hut.fi>,
+ Mark D. Studebaker <mdsxyz123@yahoo.com>
+
+ This program is free software; you can redistribute it and/or modify
+ it under the terms of the GNU General Public License as published by
+ the Free Software Foundation; either version 2 of the License, or
+ (at your option) any later version.
+
+ This program is distributed in the hope that it will be useful,
+ but WITHOUT ANY WARRANTY; without even the implied warranty of
+ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ GNU General Public License for more details.
+
+ You should have received a copy of the GNU General Public License
+ along with this program; if not, write to the Free Software
+ Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
+*/
+
+/*
+ Supports Via devices:
+ 82C596A/B (0x3050)
+ 82C596B (0x3051)
+ 82C686A/B
+ 8231
+ 8233
+ 8233A (0x3147 and 0x3177)
+ 8235
+ Note: we assume there can only be one device, with one SMBus interface.
+*/
+
+#include <linux/module.h>
+#include <linux/pci.h>
+#include <linux/kernel.h>
+#include <linux/stddef.h>
+#include <linux/sched.h>
+#include <linux/ioport.h>
+#include <linux/i2c.h>
+#include <linux/init.h>
+#include <asm/io.h>
+
+#define SMBBA1 0x90
+#define SMBBA2 0x80
+#define SMBBA3 0xD0
+
+/* SMBus address offsets */
+#define SMBHSTSTS (0 + vt596_smba)
+#define SMBHSLVSTS (1 + vt596_smba)
+#define SMBHSTCNT (2 + vt596_smba)
+#define SMBHSTCMD (3 + vt596_smba)
+#define SMBHSTADD (4 + vt596_smba)
+#define SMBHSTDAT0 (5 + vt596_smba)
+#define SMBHSTDAT1 (6 + vt596_smba)
+#define SMBBLKDAT (7 + vt596_smba)
+#define SMBSLVCNT (8 + vt596_smba)
+#define SMBSHDWCMD (9 + vt596_smba)
+#define SMBSLVEVT (0xA + vt596_smba)
+#define SMBSLVDAT (0xC + vt596_smba)
+
+/* PCI Address Constants */
+
+/* SMBus data in configuration space can be found in two places,
+ We try to select the better one*/
+
+static unsigned short smb_cf_hstcfg = 0xD2;
+
+#define SMBHSTCFG (smb_cf_hstcfg)
+#define SMBSLVC (SMBHSTCFG+1)
+#define SMBSHDW1 (SMBHSTCFG+2)
+#define SMBSHDW2 (SMBHSTCFG+3)
+#define SMBREV (SMBHSTCFG+4)
+
+/* Other settings */
+#define MAX_TIMEOUT 500
+#define ENABLE_INT9 0
+
+/* VT82C596 constants */
+#define VT596_QUICK 0x00
+#define VT596_BYTE 0x04
+#define VT596_BYTE_DATA 0x08
+#define VT596_WORD_DATA 0x0C
+#define VT596_BLOCK_DATA 0x14
+
+/* insmod parameters */
+
+/* If force is set to anything different from 0, we forcibly enable the
+ VT596. DANGEROUS! */
+static int force = 0;
+MODULE_PARM(force, "i");
+MODULE_PARM_DESC(force, "Forcibly enable the SMBus. DANGEROUS!");
+
+/* If force_addr is set to anything different from 0, we forcibly enable
+ the VT596 at the given address. VERY DANGEROUS! */
+static int force_addr = 0;
+MODULE_PARM(force_addr, "i");
+MODULE_PARM_DESC(force_addr,
+ "Forcibly enable the SMBus at the given address. "
+ "EXTREMELY DANGEROUS!");
+
+static void vt596_do_pause(unsigned int amount);
+static int vt596_transaction(void);
+s32 vt596_access(struct i2c_adapter * adap, u16 addr, unsigned short flags,
+ char read_write, u8 command, int size, union i2c_smbus_data * data);
+u32 vt596_func(struct i2c_adapter *adapter);
+
+static struct i2c_algorithm smbus_algorithm = {
+ .name = "Non-I2C SMBus adapter",
+ .id = I2C_ALGO_SMBUS,
+ .smbus_xfer = vt596_access,
+ .functionality = vt596_func,
+};
+
+static struct i2c_adapter vt596_adapter = {
+ .owner = THIS_MODULE,
+ .id = I2C_ALGO_SMBUS | I2C_HW_SMBUS_VIA2,
+ .algo = &smbus_algorithm,
+ .dev = {
+ .name = "unset",
+ },
+};
+
+
+
+
+static unsigned short vt596_smba = 0;
+
+
+/* Detect whether a compatible device can be found, and initialize it. */
+int vt596_setup(struct pci_dev *VT596_dev, struct pci_device_id const *id)
+{
+ unsigned char temp;
+
+ dev_info(&VT596_dev->dev, "Found Via %s device\n", VT596_dev->dev.name);
+
+ /* Determine the address of the SMBus areas */
+ if (force_addr) {
+ vt596_smba = force_addr & 0xfff0;
+ force = 0;
+ } else {
+ if ((pci_read_config_word(VT596_dev, id->driver_data, &vt596_smba))
+ || !(vt596_smba & 0x1)) {
+ /* try 2nd address and config reg. for 596 */
+ if((id->device == PCI_DEVICE_ID_VIA_82C596_3) &&
+ (!pci_read_config_word(VT596_dev, SMBBA2, &vt596_smba)) &&
+ (vt596_smba & 0x1)) {
+ smb_cf_hstcfg = 0x84;
+ } else {
+ /* no matches at all */
+ dev_err(&VT596_dev->dev, "Cannot configure "
+ "SMBus I/O Base address\n");
+ return(-ENODEV);
+ }
+ }
+ vt596_smba &= 0xfff0;
+ if(vt596_smba == 0) {
+ dev_err(&VT596_dev->dev, "SMBus base address "
+ "uninitialized - upgrade BIOS or use "
+ "force_addr=0xaddr\n");
+ return -ENODEV;
+ }
+ }
+
+ if (!request_region(vt596_smba, 8, "viapro-smbus")) {
+ dev_err(&VT596_dev->dev, "SMBus region 0x%x already in use!\n",
+ vt596_smba);
+ return(-ENODEV);
+ }
+
+ pci_read_config_byte(VT596_dev, SMBHSTCFG, &temp);
+ /* If force_addr is set, we program the new address here. Just to make
+ sure, we disable the VT596 first. */
+ if (force_addr) {
+ pci_write_config_byte(VT596_dev, SMBHSTCFG, temp & 0xfe);
+ pci_write_config_word(VT596_dev, id->driver_data, vt596_smba);
+ pci_write_config_byte(VT596_dev, SMBHSTCFG, temp | 0x01);
+ dev_warn(&VT596_dev->dev, "WARNING: SMBus interface set to new "
+ "address 0x%04x!\n", vt596_smba);
+ } else if ((temp & 1) == 0) {
+ if (force) {
+ /* NOTE: This assumes I/O space and other allocations
+ * WERE done by the Bios! Don't complain if your
+ * hardware does weird things after enabling this.
+ * :') Check for Bios updates before resorting to
+ * this.
+ */
+ pci_write_config_byte(VT596_dev, SMBHSTCFG,
+ temp | 1);
+ dev_info(&VT596_dev->dev, "Enabling SMBus device\n");
+ } else {
+ dev_err(&VT596_dev->dev, "SMBUS: Error: Host SMBus "
+ "controller not enabled! - upgrade BIOS or "
+ "use force=1\n");
+ return(-ENODEV);
+ }
+ }
+
+ if ((temp & 0x0E) == 8)
+ dev_dbg(&VT596_dev->dev, "using Interrupt 9 for SMBus.\n");
+ else if ((temp & 0x0E) == 0)
+ dev_dbg(&VT596_dev->dev, "using Interrupt SMI# for SMBus.\n");
+ else
+ dev_dbg(&VT596_dev->dev, "Illegal Interrupt configuration "
+ "(or code out of date)!\n");
+
+ pci_read_config_byte(VT596_dev, SMBREV, &temp);
+ dev_dbg(&VT596_dev->dev, "SMBREV = 0x%X\n", temp);
+ dev_dbg(&VT596_dev->dev, "VT596_smba = 0x%X\n", vt596_smba);
+
+ return(0);
+}
+
+
+/* Internally used pause function */
+void vt596_do_pause(unsigned int amount)
+{
+ current->state = TASK_INTERRUPTIBLE;
+ schedule_timeout(amount);
+}
+
+/* Another internally used function */
+int vt596_transaction(void)
+{
+ int temp;
+ int result = 0;
+ int timeout = 0;
+
+ dev_dbg(&vt596_adapter.dev, "Transaction (pre): CNT=%02x, CMD=%02x, "
+ "ADD=%02x, DAT0=%02x, DAT1=%02x\n", inb_p(SMBHSTCNT),
+ inb_p(SMBHSTCMD), inb_p(SMBHSTADD), inb_p(SMBHSTDAT0),
+ inb_p(SMBHSTDAT1));
+
+ /* Make sure the SMBus host is ready to start transmitting */
+ if ((temp = inb_p(SMBHSTSTS)) != 0x00) {
+ dev_dbg(&vt596_adapter.dev, "SMBus busy (0x%02x). "
+ "Resetting...\n", temp);
+
+ outb_p(temp, SMBHSTSTS);
+ if ((temp = inb_p(SMBHSTSTS)) != 0x00) {
+ dev_dbg(&vt596_adapter.dev, "Failed! (0x%02x)\n", temp);
+
+ return -1;
+ } else {
+ dev_dbg(&vt596_adapter.dev, "Successfull!\n");
+ }
+ }
+
+ /* start the transaction by setting bit 6 */
+ outb_p(inb(SMBHSTCNT) | 0x040, SMBHSTCNT);
+
+ /* We will always wait for a fraction of a second!
+ I don't know if VIA needs this, Intel did */
+ do {
+ vt596_do_pause(1);
+ temp = inb_p(SMBHSTSTS);
+ } while ((temp & 0x01) && (timeout++ < MAX_TIMEOUT));
+
+ /* If the SMBus is still busy, we give up */
+ if (timeout >= MAX_TIMEOUT) {
+ result = -1;
+ dev_dbg(&vt596_adapter.dev, "SMBus Timeout!\n");
+ }
+
+ if (temp & 0x10) {
+ result = -1;
+ dev_dbg(&vt596_adapter.dev, "Error: Failed bus transaction\n");
+ }
+
+ if (temp & 0x08) {
+ result = -1;
+ dev_info(&vt596_adapter.dev, "Bus collision! SMBus may be "
+ "locked until next hard\nreset. (sorry!)\n");
+ /* Clock stops and slave is stuck in mid-transmission */
+ }
+
+ if (temp & 0x04) {
+ result = -1;
+ dev_dbg(&vt596_adapter.dev, "Error: no response!\n");
+ }
+
+ if (inb_p(SMBHSTSTS) != 0x00)
+ outb_p(inb(SMBHSTSTS), SMBHSTSTS);
+
+ if ((temp = inb_p(SMBHSTSTS)) != 0x00) {
+ dev_dbg(&vt596_adapter.dev, "Failed reset at end of "
+ "transaction (%02x)\n", temp);
+ }
+ dev_dbg(&vt596_adapter.dev, "Transaction (post): CNT=%02x, CMD=%02x, "
+ "ADD=%02x, DAT0=%02x, DAT1=%02x\n", inb_p(SMBHSTCNT),
+ inb_p(SMBHSTCMD), inb_p(SMBHSTADD), inb_p(SMBHSTDAT0),
+ inb_p(SMBHSTDAT1));
+
+ return result;
+}
+
+/* Return -1 on error. */
+s32 vt596_access(struct i2c_adapter *adap, u16 addr, unsigned short flags,
+ char read_write, u8 command, int size,
+ union i2c_smbus_data * data)
+{
+ int i, len;
+
+ switch (size) {
+ case I2C_SMBUS_PROC_CALL:
+ dev_info(&vt596_adapter.dev, "I2C_SMBUS_PROC_CALL not supported!\n");
+ return -1;
+ case I2C_SMBUS_QUICK:
+ outb_p(((addr & 0x7f) << 1) | (read_write & 0x01),
+ SMBHSTADD);
+ size = VT596_QUICK;
+ break;
+ case I2C_SMBUS_BYTE:
+ outb_p(((addr & 0x7f) << 1) | (read_write & 0x01),
+ SMBHSTADD);
+ if (read_write == I2C_SMBUS_WRITE)
+ outb_p(command, SMBHSTCMD);
+ size = VT596_BYTE;
+ break;
+ case I2C_SMBUS_BYTE_DATA:
+ outb_p(((addr & 0x7f) << 1) | (read_write & 0x01),
+ SMBHSTADD);
+ outb_p(command, SMBHSTCMD);
+ if (read_write == I2C_SMBUS_WRITE)
+ outb_p(data->byte, SMBHSTDAT0);
+ size = VT596_BYTE_DATA;
+ break;
+ case I2C_SMBUS_WORD_DATA:
+ outb_p(((addr & 0x7f) << 1) | (read_write & 0x01),
+ SMBHSTADD);
+ outb_p(command, SMBHSTCMD);
+ if (read_write == I2C_SMBUS_WRITE) {
+ outb_p(data->word & 0xff, SMBHSTDAT0);
+ outb_p((data->word & 0xff00) >> 8, SMBHSTDAT1);
+ }
+ size = VT596_WORD_DATA;
+ break;
+ case I2C_SMBUS_BLOCK_DATA:
+ outb_p(((addr & 0x7f) << 1) | (read_write & 0x01),
+ SMBHSTADD);
+ outb_p(command, SMBHSTCMD);
+ if (read_write == I2C_SMBUS_WRITE) {
+ len = data->block[0];
+ if (len < 0)
+ len = 0;
+ if (len > 32)
+ len = 32;
+ outb_p(len, SMBHSTDAT0);
+ i = inb_p(SMBHSTCNT); /* Reset SMBBLKDAT */
+ for (i = 1; i <= len; i++)
+ outb_p(data->block[i], SMBBLKDAT);
+ }
+ size = VT596_BLOCK_DATA;
+ break;
+ }
+
+ outb_p((size & 0x1C) + (ENABLE_INT9 & 1), SMBHSTCNT);
+
+ if (vt596_transaction()) /* Error in transaction */
+ return -1;
+
+ if ((read_write == I2C_SMBUS_WRITE) || (size == VT596_QUICK))
+ return 0;
+
+
+ switch (size) {
+ case VT596_BYTE:
+ /* Where is the result put? I assume here it is in
+ * SMBHSTDAT0 but it might just as well be in the
+ * SMBHSTCMD. No clue in the docs
+ */
+ data->byte = inb_p(SMBHSTDAT0);
+ break;
+ case VT596_BYTE_DATA:
+ data->byte = inb_p(SMBHSTDAT0);
+ break;
+ case VT596_WORD_DATA:
+ data->word = inb_p(SMBHSTDAT0) + (inb_p(SMBHSTDAT1) << 8);
+ break;
+ case VT596_BLOCK_DATA:
+ data->block[0] = inb_p(SMBHSTDAT0);
+ i = inb_p(SMBHSTCNT); /* Reset SMBBLKDAT */
+ for (i = 1; i <= data->block[0]; i++)
+ data->block[i] = inb_p(SMBBLKDAT);
+ break;
+ }
+ return 0;
+}
+
+
+u32 vt596_func(struct i2c_adapter *adapter)
+{
+ return I2C_FUNC_SMBUS_QUICK | I2C_FUNC_SMBUS_BYTE |
+ I2C_FUNC_SMBUS_BYTE_DATA | I2C_FUNC_SMBUS_WORD_DATA |
+ I2C_FUNC_SMBUS_BLOCK_DATA;
+}
+
+
+
+static struct pci_device_id vt596_ids[] __devinitdata = {
+ {
+ .vendor = PCI_VENDOR_ID_VIA,
+ .device = PCI_DEVICE_ID_VIA_82C596_3,
+ .subvendor = PCI_ANY_ID,
+ .subdevice = PCI_ANY_ID,
+ .driver_data = SMBBA1,
+ },
+ {
+ .vendor = PCI_VENDOR_ID_VIA,
+ .device = PCI_DEVICE_ID_VIA_82C596B_3,
+ .subvendor = PCI_ANY_ID,
+ .subdevice = PCI_ANY_ID,
+ .driver_data = SMBBA1,
+ },
+ {
+ .vendor = PCI_VENDOR_ID_VIA,
+ .device = PCI_DEVICE_ID_VIA_82C686_4,
+ .subvendor = PCI_ANY_ID,
+ .subdevice = PCI_ANY_ID,
+ .driver_data = SMBBA1,
+ },
+ {
+ .vendor = PCI_VENDOR_ID_VIA,
+ .device = PCI_DEVICE_ID_VIA_8233_0,
+ .subvendor = PCI_ANY_ID,
+ .subdevice = PCI_ANY_ID,
+ .driver_data = SMBBA3
+ },
+ {
+ .vendor = PCI_VENDOR_ID_VIA,
+ .device = PCI_DEVICE_ID_VIA_8233A,
+ .subvendor = PCI_ANY_ID,
+ .subdevice = PCI_ANY_ID,
+ .driver_data = SMBBA3,
+ },
+ {
+ .vendor = PCI_VENDOR_ID_VIA,
+ .device = PCI_DEVICE_ID_VIA_8235,
+ .subvendor = PCI_ANY_ID,
+ .subdevice = PCI_ANY_ID,
+ .driver_data = SMBBA3
+ },
+ {
+ .vendor = PCI_VENDOR_ID_VIA,
+ .device = PCI_DEVICE_ID_VIA_8231_4,
+ .subvendor = PCI_ANY_ID,
+ .subdevice = PCI_ANY_ID,
+ .driver_data = SMBBA1,
+ },
+ { 0, }
+};
+
+static int __devinit vt596_probe(struct pci_dev *dev, const struct pci_device_id *id)
+{
+ int retval;
+
+ retval = vt596_setup(dev, id);
+ if (retval)
+ return retval;
+
+ vt596_adapter.dev.parent = &dev->dev;
+
+ snprintf(vt596_adapter.dev.name, DEVICE_NAME_SIZE,
+ "SMBus Via Pro adapter at %04x", vt596_smba);
+
+ retval = i2c_add_adapter(&vt596_adapter);
+
+ return retval;
+}
+
+static void __devexit vt596_remove(struct pci_dev *dev)
+{
+ i2c_del_adapter(&vt596_adapter);
+}
+
+static struct pci_driver vt596_driver = {
+ .name = "vt596 smbus",
+ .id_table = vt596_ids,
+ .probe = vt596_probe,
+ .remove = __devexit_p(vt596_remove),
+};
+
+static int __init i2c_vt596_init(void)
+{
+ return pci_module_init(&vt596_driver);
+}
+
+
+static void __exit i2c_vt596_exit(void)
+{
+ pci_unregister_driver(&vt596_driver);
+ release_region(vt596_smba, 8);
+}
+
+
+
+MODULE_AUTHOR("Frodo Looijaard <frodol@dds.nl> and Philip Edelbrock <phil@netroedge.com>");
+MODULE_DESCRIPTION("vt82c596 SMBus driver");
+
+MODULE_LICENSE("GPL");
+
+module_init(i2c_vt596_init);
+module_exit(i2c_vt596_exit);
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