/*
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/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,
.timeout = TIMEOUT
};
static struct i2c_adapter voodoo3_i2c_adapter = {
.owner = THIS_MODULE,
.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,
.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_del_adapter(&voodoo3_i2c_adapter);
return retval;
}
static void __devexit voodoo3_remove(struct pci_dev *dev)
{
i2c_del_adapter(&voodoo3_i2c_adapter);
i2c_del_adapter(&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);
