1 files changed, 254 insertions, 0 deletions

diff --git a/drivers/i2c/busses/i2c-voodoo3.c b/drivers/i2c/busses/i2c-voodoo3.c
new file mode 100644
index 000000000000..3edf0e34155e
--- /dev/null
+++ b/drivers/i2c/busses/i2c-voodoo3.c
@@ -0,0 +1,254 @@
+/*
+    voodoo3.c - Part of lm_sensors, Linux kernel modules for hardware
+              monitoring
+    Copyright (c) 1998, 1999  Frodo Looijaard <frodol@dds.nl>,
+    Philip Edelbrock <phil@netroedge.com>,
+    Ralph Metzler <rjkm@thp.uni-koeln.de>, and
+    Mark D. Studebaker <mdsxyz123@yahoo.com>
+    
+    Based on code written by Ralph Metzler <rjkm@thp.uni-koeln.de> and
+    Simon Vogl
+
+    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.
+*/
+
+/* This interfaces to the I2C bus of the Voodoo3 to gain access to
+    the BT869 and possibly other I2C devices. */
+
+#include <linux/config.h>
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/init.h>
+#include <linux/pci.h>
+#include <linux/i2c.h>
+#include <linux/i2c-algo-bit.h>
+#include <asm/io.h>
+
+/* the only registers we use */
+#define REG             0x78
+#define REG2            0x70
+
+/* bit locations in the register */
+#define DDC_ENAB        0x00040000
+#define DDC_SCL_OUT     0x00080000
+#define DDC_SDA_OUT     0x00100000
+#define DDC_SCL_IN      0x00200000
+#define DDC_SDA_IN      0x00400000
+#define I2C_ENAB        0x00800000
+#define I2C_SCL_OUT     0x01000000
+#define I2C_SDA_OUT     0x02000000
+#define I2C_SCL_IN      0x04000000
+#define I2C_SDA_IN      0x08000000
+
+/* initialization states */
+#define INIT2           0x2
+#define INIT3           0x4
+
+/* delays */
+#define CYCLE_DELAY     10
+#define TIMEOUT         (HZ / 2)
+
+
+static void __iomem *ioaddr;
+
+/* The voo GPIO registers don't have individual masks for each bit
+   so we always have to read before writing. */
+
+static void bit_vooi2c_setscl(void *data, int val)
+{
+        unsigned int r;
+        r = readl(ioaddr + REG);
+        if (val)
+                r |= I2C_SCL_OUT;
+        else
+                r &= ~I2C_SCL_OUT;
+        writel(r, ioaddr + REG);
+        readl(ioaddr + REG);    /* flush posted write */
+}
+
+static void bit_vooi2c_setsda(void *data, int val)
+{
+        unsigned int r;
+        r = readl(ioaddr + REG);
+        if (val)
+                r |= I2C_SDA_OUT;
+        else
+                r &= ~I2C_SDA_OUT;
+        writel(r, ioaddr + REG);
+        readl(ioaddr + REG);    /* flush posted write */
+}
+
+/* The GPIO pins are open drain, so the pins always remain outputs.
+   We rely on the i2c-algo-bit routines to set the pins high before
+   reading the input from other chips. */
+
+static int bit_vooi2c_getscl(void *data)
+{
+        return (0 != (readl(ioaddr + REG) & I2C_SCL_IN));
+}
+
+static int bit_vooi2c_getsda(void *data)
+{
+        return (0 != (readl(ioaddr + REG) & I2C_SDA_IN));
+}
+
+static void bit_vooddc_setscl(void *data, int val)
+{
+        unsigned int r;
+        r = readl(ioaddr + REG);
+        if (val)
+                r |= DDC_SCL_OUT;
+        else
+                r &= ~DDC_SCL_OUT;
+        writel(r, ioaddr + REG);
+        readl(ioaddr + REG);    /* flush posted write */
+}
+
+static void bit_vooddc_setsda(void *data, int val)
+{
+        unsigned int r;
+        r = readl(ioaddr + REG);
+        if (val)
+                r |= DDC_SDA_OUT;
+        else
+                r &= ~DDC_SDA_OUT;
+        writel(r, ioaddr + REG);
+        readl(ioaddr + REG);    /* flush posted write */
+}
+
+static int bit_vooddc_getscl(void *data)
+{
+        return (0 != (readl(ioaddr + REG) & DDC_SCL_IN));
+}
+
+static int bit_vooddc_getsda(void *data)
+{
+        return (0 != (readl(ioaddr + REG) & DDC_SDA_IN));
+}
+
+static int config_v3(struct pci_dev *dev)
+{
+        unsigned long cadr;
+
+        /* map Voodoo3 memory */
+        cadr = dev->resource[0].start;
+        cadr &= PCI_BASE_ADDRESS_MEM_MASK;
+        ioaddr = ioremap_nocache(cadr, 0x1000);
+        if (ioaddr) {
+                writel(0x8160, ioaddr + REG2);
+                writel(0xcffc0020, ioaddr + REG);
+                dev_info(&dev->dev, "Using Banshee/Voodoo3 I2C device at %p\n", ioaddr);
+                return 0;
+        }
+        return -ENODEV;
+}
+
+static struct i2c_algo_bit_data voo_i2c_bit_data = {
+        .setsda         = bit_vooi2c_setsda,
+        .setscl         = bit_vooi2c_setscl,
+        .getsda         = bit_vooi2c_getsda,
+        .getscl         = bit_vooi2c_getscl,
+        .udelay         = CYCLE_DELAY,
+        .mdelay         = CYCLE_DELAY,
+        .timeout        = TIMEOUT
+};
+
+static struct i2c_adapter voodoo3_i2c_adapter = {
+        .owner          = THIS_MODULE,
+        .class          = I2C_CLASS_TV_ANALOG, 
+        .name           = "I2C Voodoo3/Banshee adapter",
+        .algo_data      = &voo_i2c_bit_data,
+};
+
+static struct i2c_algo_bit_data voo_ddc_bit_data = {
+        .setsda         = bit_vooddc_setsda,
+        .setscl         = bit_vooddc_setscl,
+        .getsda         = bit_vooddc_getsda,
+        .getscl         = bit_vooddc_getscl,
+        .udelay         = CYCLE_DELAY,
+        .mdelay         = CYCLE_DELAY,
+        .timeout        = TIMEOUT
+};
+
+static struct i2c_adapter voodoo3_ddc_adapter = {
+        .owner          = THIS_MODULE,
+        .class          = I2C_CLASS_DDC, 
+        .name           = "DDC Voodoo3/Banshee adapter",
+        .algo_data      = &voo_ddc_bit_data,
+};
+
+static struct pci_device_id voodoo3_ids[] __devinitdata = {
+        { PCI_DEVICE(PCI_VENDOR_ID_3DFX, PCI_DEVICE_ID_3DFX_VOODOO3) },
+        { PCI_DEVICE(PCI_VENDOR_ID_3DFX, PCI_DEVICE_ID_3DFX_BANSHEE) },
+        { 0, }
+};
+
+MODULE_DEVICE_TABLE (pci, voodoo3_ids);
+
+static int __devinit voodoo3_probe(struct pci_dev *dev, const struct pci_device_id *id)
+{
+        int retval;
+
+        retval = config_v3(dev);
+        if (retval)
+                return retval;
+
+        /* set up the sysfs linkage to our parent device */
+        voodoo3_i2c_adapter.dev.parent = &dev->dev;
+        voodoo3_ddc_adapter.dev.parent = &dev->dev;
+
+        retval = i2c_bit_add_bus(&voodoo3_i2c_adapter);
+        if (retval)
+                return retval;
+        retval = i2c_bit_add_bus(&voodoo3_ddc_adapter);
+        if (retval)
+                i2c_bit_del_bus(&voodoo3_i2c_adapter);
+        return retval;
+}
+
+static void __devexit voodoo3_remove(struct pci_dev *dev)
+{
+        i2c_bit_del_bus(&voodoo3_i2c_adapter);
+        i2c_bit_del_bus(&voodoo3_ddc_adapter);
+        iounmap(ioaddr);
+}
+
+static struct pci_driver voodoo3_driver = {
+        .name           = "voodoo3_smbus",
+        .id_table       = voodoo3_ids,
+        .probe          = voodoo3_probe,
+        .remove         = __devexit_p(voodoo3_remove),
+};
+
+static int __init i2c_voodoo3_init(void)
+{
+        return pci_register_driver(&voodoo3_driver);
+}
+
+static void __exit i2c_voodoo3_exit(void)
+{
+        pci_unregister_driver(&voodoo3_driver);
+}
+
+
+MODULE_AUTHOR("Frodo Looijaard <frodol@dds.nl>, "
+                "Philip Edelbrock <phil@netroedge.com>, "
+                "Ralph Metzler <rjkm@thp.uni-koeln.de>, "
+                "and Mark D. Studebaker <mdsxyz123@yahoo.com>");
+MODULE_DESCRIPTION("Voodoo3 I2C/SMBus driver");
+MODULE_LICENSE("GPL");
+
+module_init(i2c_voodoo3_init);
+module_exit(i2c_voodoo3_exit);