1 files changed, 523 insertions, 0 deletions

diff --git a/drivers/i2c/busses/i2c-sis630.c b/drivers/i2c/busses/i2c-sis630.c
new file mode 100644
index 000000000000..58df63df1540
--- /dev/null
+++ b/drivers/i2c/busses/i2c-sis630.c
@@ -0,0 +1,523 @@
+/*
+    i2c-sis630.c - Part of lm_sensors, Linux kernel modules for hardware
+              monitoring
+
+    Copyright (c) 2002,2003 Alexander Malysh <amalysh@web.de>
+
+    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.
+*/
+
+/*
+   Changes:
+   24.08.2002
+        Fixed the typo in sis630_access (Thanks to Mark M. Hoffman)
+        Changed sis630_transaction.(Thanks to Mark M. Hoffman)
+   18.09.2002
+        Added SIS730 as supported.
+   21.09.2002
+        Added high_clock module option.If this option is set
+        used Host Master Clock 56KHz (default 14KHz).For now we save old Host
+        Master Clock and after transaction completed restore (otherwise
+        it's confuse BIOS and hung Machine).
+   24.09.2002
+        Fixed typo in sis630_access
+        Fixed logical error by restoring of Host Master Clock
+   31.07.2003
+        Added block data read/write support.
+*/
+
+/*
+   Status: beta
+
+   Supports:
+        SIS 630
+        SIS 730
+
+   Note: we assume there can only be one device, with one SMBus interface.
+*/
+
+#include <linux/config.h>
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/delay.h>
+#include <linux/pci.h>
+#include <linux/ioport.h>
+#include <linux/init.h>
+#include <linux/i2c.h>
+#include <asm/io.h>
+
+/* SIS630 SMBus registers */
+#define SMB_STS                 0x80    /* status */
+#define SMB_EN                  0x81    /* status enable */
+#define SMB_CNT                 0x82
+#define SMBHOST_CNT             0x83
+#define SMB_ADDR                0x84
+#define SMB_CMD                 0x85
+#define SMB_PCOUNT              0x86    /* processed count */
+#define SMB_COUNT               0x87
+#define SMB_BYTE                0x88    /* ~0x8F data byte field */
+#define SMBDEV_ADDR             0x90
+#define SMB_DB0                 0x91
+#define SMB_DB1                 0x92
+#define SMB_SAA                 0x93
+
+/* register count for request_region */
+#define SIS630_SMB_IOREGION     20
+
+/* PCI address constants */
+/* acpi base address register  */
+#define SIS630_ACPI_BASE_REG    0x74
+/* bios control register */
+#define SIS630_BIOS_CTL_REG     0x40
+
+/* Other settings */
+#define MAX_TIMEOUT             500
+
+/* SIS630 constants */
+#define SIS630_QUICK            0x00
+#define SIS630_BYTE             0x01
+#define SIS630_BYTE_DATA        0x02
+#define SIS630_WORD_DATA        0x03
+#define SIS630_PCALL            0x04
+#define SIS630_BLOCK_DATA       0x05
+
+/* insmod parameters */
+static int high_clock;
+static int force;
+module_param(high_clock, bool, 0);
+MODULE_PARM_DESC(high_clock, "Set Host Master Clock to 56KHz (default 14KHz).");
+module_param(force, bool, 0);
+MODULE_PARM_DESC(force, "Forcibly enable the SIS630. DANGEROUS!");
+
+/* acpi base address */
+static unsigned short acpi_base = 0;
+
+/* supported chips */
+static int supported[] = {
+        PCI_DEVICE_ID_SI_630,
+        PCI_DEVICE_ID_SI_730,
+        0 /* terminates the list */
+};
+
+static inline u8 sis630_read(u8 reg)
+{
+        return inb(acpi_base + reg);
+}
+
+static inline void sis630_write(u8 reg, u8 data)
+{
+        outb(data, acpi_base + reg);
+}
+
+static int sis630_transaction_start(struct i2c_adapter *adap, int size, u8 *oldclock)
+{
+        int temp;
+
+        /* Make sure the SMBus host is ready to start transmitting. */
+        if ((temp = sis630_read(SMB_CNT) & 0x03) != 0x00) {
+                dev_dbg(&adap->dev, "SMBus busy (%02x).Resetting...\n",temp);
+                /* kill smbus transaction */
+                sis630_write(SMBHOST_CNT, 0x20);
+
+                if ((temp = sis630_read(SMB_CNT) & 0x03) != 0x00) {
+                        dev_dbg(&adap->dev, "Failed! (%02x)\n", temp);
+                        return -1;
+                } else {
+                        dev_dbg(&adap->dev, "Successfull!\n");
+                }
+        }
+
+        /* save old clock, so we can prevent machine for hung */
+        *oldclock = sis630_read(SMB_CNT);
+
+        dev_dbg(&adap->dev, "saved clock 0x%02x\n", *oldclock);
+
+        /* disable timeout interrupt , set Host Master Clock to 56KHz if requested */
+        if (high_clock)
+                sis630_write(SMB_CNT, 0x20);
+        else
+                sis630_write(SMB_CNT, (*oldclock & ~0x40));
+
+        /* clear all sticky bits */
+        temp = sis630_read(SMB_STS);
+        sis630_write(SMB_STS, temp & 0x1e);
+
+        /* start the transaction by setting bit 4 and size */
+        sis630_write(SMBHOST_CNT,0x10 | (size & 0x07));
+
+        return 0;
+}
+
+static int sis630_transaction_wait(struct i2c_adapter *adap, int size)
+{
+        int temp, result = 0, timeout = 0;
+
+        /* We will always wait for a fraction of a second! */
+        do {
+                msleep(1);
+                temp = sis630_read(SMB_STS);
+                /* check if block transmitted */
+                if (size == SIS630_BLOCK_DATA && (temp & 0x10))
+                        break;
+        } while (!(temp & 0x0e) && (timeout++ < MAX_TIMEOUT));
+
+        /* If the SMBus is still busy, we give up */
+        if (timeout >= MAX_TIMEOUT) {
+                dev_dbg(&adap->dev, "SMBus Timeout!\n");
+                result = -1;
+        }
+
+        if (temp & 0x02) {
+                dev_dbg(&adap->dev, "Error: Failed bus transaction\n");
+                result = -1;
+        }
+
+        if (temp & 0x04) {
+                dev_err(&adap->dev, "Bus collision!\n");
+                result = -1;
+                /*
+                  TBD: Datasheet say:
+                  the software should clear this bit and restart SMBUS operation.
+                  Should we do it or user start request again?
+                */
+        }
+
+        return result;
+}
+
+static void sis630_transaction_end(struct i2c_adapter *adap, u8 oldclock)
+{
+        int temp = 0;
+
+        /* clear all status "sticky" bits */
+        sis630_write(SMB_STS, temp);
+
+        dev_dbg(&adap->dev, "SMB_CNT before clock restore 0x%02x\n", sis630_read(SMB_CNT));
+
+        /*
+         * restore old Host Master Clock if high_clock is set
+         * and oldclock was not 56KHz
+         */
+        if (high_clock && !(oldclock & 0x20))
+                sis630_write(SMB_CNT,(sis630_read(SMB_CNT) & ~0x20));
+
+        dev_dbg(&adap->dev, "SMB_CNT after clock restore 0x%02x\n", sis630_read(SMB_CNT));
+}
+
+static int sis630_transaction(struct i2c_adapter *adap, int size)
+{
+        int result = 0;
+        u8 oldclock = 0;
+
+        result = sis630_transaction_start(adap, size, &oldclock);
+        if (!result) {
+                result = sis630_transaction_wait(adap, size);
+                sis630_transaction_end(adap, oldclock);
+        }
+
+        return result;
+}
+
+static int sis630_block_data(struct i2c_adapter *adap, union i2c_smbus_data *data, int read_write)
+{
+        int i, len = 0, rc = 0;
+        u8 oldclock = 0;
+
+        if (read_write == I2C_SMBUS_WRITE) {
+                len = data->block[0];
+                if (len < 0)
+                        len = 0;
+                else if (len > 32)
+                        len = 32;
+                sis630_write(SMB_COUNT, len);
+                for (i=1; i <= len; i++) {
+                        dev_dbg(&adap->dev, "set data 0x%02x\n", data->block[i]);
+                        /* set data */
+                        sis630_write(SMB_BYTE+(i-1)%8, data->block[i]);
+                        if (i==8 || (len<8 && i==len)) {
+                                dev_dbg(&adap->dev, "start trans len=%d i=%d\n",len ,i);
+                                /* first transaction */
+                                if (sis630_transaction_start(adap, SIS630_BLOCK_DATA, &oldclock))
+                                        return -1;
+                        }
+                        else if ((i-1)%8 == 7 || i==len) {
+                                dev_dbg(&adap->dev, "trans_wait len=%d i=%d\n",len,i);
+                                if (i>8) {
+                                        dev_dbg(&adap->dev, "clear smbary_sts len=%d i=%d\n",len,i);
+                                        /*
+                                           If this is not first transaction,
+                                           we must clear sticky bit.
+                                           clear SMBARY_STS
+                                        */
+                                        sis630_write(SMB_STS,0x10);
+                                }
+                                if (sis630_transaction_wait(adap, SIS630_BLOCK_DATA)) {
+                                        dev_dbg(&adap->dev, "trans_wait failed\n");
+                                        rc = -1;
+                                        break;
+                                }
+                        }
+                }
+        }
+        else {
+                /* read request */
+                data->block[0] = len = 0;
+                if (sis630_transaction_start(adap, SIS630_BLOCK_DATA, &oldclock)) {
+                        return -1;
+                }
+                do {
+                        if (sis630_transaction_wait(adap, SIS630_BLOCK_DATA)) {
+                                dev_dbg(&adap->dev, "trans_wait failed\n");
+                                rc = -1;
+                                break;
+                        }
+                        /* if this first transaction then read byte count */
+                        if (len == 0)
+                                data->block[0] = sis630_read(SMB_COUNT);
+
+                        /* just to be sure */
+                        if (data->block[0] > 32)
+                                data->block[0] = 32;
+
+                        dev_dbg(&adap->dev, "block data read len=0x%x\n", data->block[0]);
+
+                        for (i=0; i < 8 && len < data->block[0]; i++,len++) {
+                                dev_dbg(&adap->dev, "read i=%d len=%d\n", i, len);
+                                data->block[len+1] = sis630_read(SMB_BYTE+i);
+                        }
+
+                        dev_dbg(&adap->dev, "clear smbary_sts len=%d i=%d\n",len,i);
+
+                        /* clear SMBARY_STS */
+                        sis630_write(SMB_STS,0x10);
+                } while(len < data->block[0]);
+        }
+
+        sis630_transaction_end(adap, oldclock);
+
+        return rc;
+}
+
+/* Return -1 on error. */
+static s32 sis630_access(struct i2c_adapter *adap, u16 addr,
+                         unsigned short flags, char read_write,
+                         u8 command, int size, union i2c_smbus_data *data)
+{
+        switch (size) {
+                case I2C_SMBUS_QUICK:
+                        sis630_write(SMB_ADDR, ((addr & 0x7f) << 1) | (read_write & 0x01));
+                        size = SIS630_QUICK;
+                        break;
+                case I2C_SMBUS_BYTE:
+                        sis630_write(SMB_ADDR, ((addr & 0x7f) << 1) | (read_write & 0x01));
+                        if (read_write == I2C_SMBUS_WRITE)
+                                sis630_write(SMB_CMD, command);
+                        size = SIS630_BYTE;
+                        break;
+                case I2C_SMBUS_BYTE_DATA:
+                        sis630_write(SMB_ADDR, ((addr & 0x7f) << 1) | (read_write & 0x01));
+                        sis630_write(SMB_CMD, command);
+                        if (read_write == I2C_SMBUS_WRITE)
+                                sis630_write(SMB_BYTE, data->byte);
+                        size = SIS630_BYTE_DATA;
+                        break;
+                case I2C_SMBUS_PROC_CALL:
+                case I2C_SMBUS_WORD_DATA:
+                        sis630_write(SMB_ADDR,((addr & 0x7f) << 1) | (read_write & 0x01));
+                        sis630_write(SMB_CMD, command);
+                        if (read_write == I2C_SMBUS_WRITE) {
+                                sis630_write(SMB_BYTE, data->word & 0xff);
+                                sis630_write(SMB_BYTE + 1,(data->word & 0xff00) >> 8);
+                        }
+                        size = (size == I2C_SMBUS_PROC_CALL ? SIS630_PCALL : SIS630_WORD_DATA);
+                        break;
+                case I2C_SMBUS_BLOCK_DATA:
+                        sis630_write(SMB_ADDR,((addr & 0x7f) << 1) | (read_write & 0x01));
+                        sis630_write(SMB_CMD, command);
+                        size = SIS630_BLOCK_DATA;
+                        return sis630_block_data(adap, data, read_write);
+                default:
+                        printk("Unsupported I2C size\n");
+                        return -1;
+                        break;
+        }
+
+        if (sis630_transaction(adap, size))
+                return -1;
+
+        if ((size != SIS630_PCALL) &&
+                ((read_write == I2C_SMBUS_WRITE) || (size == SIS630_QUICK))) {
+                return 0;
+        }
+
+        switch(size) {
+                case SIS630_BYTE:
+                case SIS630_BYTE_DATA:
+                        data->byte = sis630_read(SMB_BYTE);
+                        break;
+                case SIS630_PCALL:
+                case SIS630_WORD_DATA:
+                        data->word = sis630_read(SMB_BYTE) + (sis630_read(SMB_BYTE + 1) << 8);
+                        break;
+                default:
+                        return -1;
+                        break;
+        }
+
+        return 0;
+}
+
+static u32 sis630_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_PROC_CALL |
+                I2C_FUNC_SMBUS_BLOCK_DATA;
+}
+
+static int sis630_setup(struct pci_dev *sis630_dev)
+{
+        unsigned char b;
+        struct pci_dev *dummy = NULL;
+        int retval = -ENODEV, i;
+
+        /* check for supported SiS devices */
+        for (i=0; supported[i] > 0 ; i++) {
+                if ((dummy = pci_get_device(PCI_VENDOR_ID_SI, supported[i], dummy)))
+                        break; /* found */
+        }
+
+        if (dummy) {
+                pci_dev_put(dummy);
+        }
+        else if (force) {
+                dev_err(&sis630_dev->dev, "WARNING: Can't detect SIS630 compatible device, but "
+                        "loading because of force option enabled\n");
+        }
+        else {
+                return -ENODEV;
+        }
+
+        /*
+           Enable ACPI first , so we can accsess reg 74-75
+           in acpi io space and read acpi base addr
+        */
+        if (pci_read_config_byte(sis630_dev, SIS630_BIOS_CTL_REG,&b)) {
+                dev_err(&sis630_dev->dev, "Error: Can't read bios ctl reg\n");
+                goto exit;
+        }
+        /* if ACPI already enabled , do nothing */
+        if (!(b & 0x80) &&
+            pci_write_config_byte(sis630_dev, SIS630_BIOS_CTL_REG, b | 0x80)) {
+                dev_err(&sis630_dev->dev, "Error: Can't enable ACPI\n");
+                goto exit;
+        }
+
+        /* Determine the ACPI base address */
+        if (pci_read_config_word(sis630_dev,SIS630_ACPI_BASE_REG,&acpi_base)) {
+                dev_err(&sis630_dev->dev, "Error: Can't determine ACPI base address\n");
+                goto exit;
+        }
+
+        dev_dbg(&sis630_dev->dev, "ACPI base at 0x%04x\n", acpi_base);
+
+        /* Everything is happy, let's grab the memory and set things up. */
+        if (!request_region(acpi_base + SMB_STS, SIS630_SMB_IOREGION, "sis630-smbus")) {
+                dev_err(&sis630_dev->dev, "SMBus registers 0x%04x-0x%04x already "
+                        "in use!\n", acpi_base + SMB_STS, acpi_base + SMB_SAA);
+                goto exit;
+        }
+
+        retval = 0;
+
+exit:
+        if (retval)
+                acpi_base = 0;
+        return retval;
+}
+
+
+static struct i2c_algorithm smbus_algorithm = {
+        .name           = "Non-I2C SMBus adapter",
+        .id             = I2C_ALGO_SMBUS,
+        .smbus_xfer     = sis630_access,
+        .functionality  = sis630_func,
+};
+
+static struct i2c_adapter sis630_adapter = {
+        .owner          = THIS_MODULE,
+        .class          = I2C_CLASS_HWMON,
+        .name           = "unset",
+        .algo           = &smbus_algorithm,
+};
+
+static struct pci_device_id sis630_ids[] __devinitdata = {
+        { PCI_DEVICE(PCI_VENDOR_ID_SI, PCI_DEVICE_ID_SI_503) },
+        { PCI_DEVICE(PCI_VENDOR_ID_SI, PCI_DEVICE_ID_SI_LPC) },
+        { 0, }
+};
+
+MODULE_DEVICE_TABLE (pci, sis630_ids);
+
+static int __devinit sis630_probe(struct pci_dev *dev, const struct pci_device_id *id)
+{
+        if (sis630_setup(dev)) {
+                dev_err(&dev->dev, "SIS630 comp. bus not detected, module not inserted.\n");
+                return -ENODEV;
+        }
+
+        /* set up the driverfs linkage to our parent device */
+        sis630_adapter.dev.parent = &dev->dev;
+
+        sprintf(sis630_adapter.name, "SMBus SIS630 adapter at %04x",
+                acpi_base + SMB_STS);
+
+        return i2c_add_adapter(&sis630_adapter);
+}
+
+static void __devexit sis630_remove(struct pci_dev *dev)
+{
+        if (acpi_base) {
+                i2c_del_adapter(&sis630_adapter);
+                release_region(acpi_base + SMB_STS, SIS630_SMB_IOREGION);
+                acpi_base = 0;
+        }
+}
+
+
+static struct pci_driver sis630_driver = {
+        .name           = "sis630_smbus",
+        .id_table       = sis630_ids,
+        .probe          = sis630_probe,
+        .remove         = __devexit_p(sis630_remove),
+};
+
+static int __init i2c_sis630_init(void)
+{
+        return pci_register_driver(&sis630_driver);
+}
+
+
+static void __exit i2c_sis630_exit(void)
+{
+        pci_unregister_driver(&sis630_driver);
+}
+
+
+MODULE_LICENSE("GPL");
+MODULE_AUTHOR("Alexander Malysh <amalysh@web.de>");
+MODULE_DESCRIPTION("SIS630 SMBus driver");
+
+module_init(i2c_sis630_init);
+module_exit(i2c_sis630_exit);