249 lines
6.1 KiB
C
249 lines
6.1 KiB
C
/*
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Copyright (c) 1998, 1999 Frodo Looijaard <frodol@dds.nl>,
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Philip Edelbrock <phil@netroedge.com>,
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Ralph Metzler <rjkm@thp.uni-koeln.de>, and
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Mark D. Studebaker <mdsxyz123@yahoo.com>
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Based on code written by Ralph Metzler <rjkm@thp.uni-koeln.de> and
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Simon Vogl
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 2 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program; if not, write to the Free Software
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Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
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*/
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/* This interfaces to the I2C bus of the Voodoo3 to gain access to
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the BT869 and possibly other I2C devices. */
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#include <linux/kernel.h>
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#include <linux/module.h>
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#include <linux/init.h>
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#include <linux/pci.h>
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#include <linux/i2c.h>
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#include <linux/i2c-algo-bit.h>
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#include <asm/io.h>
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/* the only registers we use */
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#define REG 0x78
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#define REG2 0x70
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/* bit locations in the register */
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#define DDC_ENAB 0x00040000
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#define DDC_SCL_OUT 0x00080000
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#define DDC_SDA_OUT 0x00100000
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#define DDC_SCL_IN 0x00200000
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#define DDC_SDA_IN 0x00400000
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#define I2C_ENAB 0x00800000
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#define I2C_SCL_OUT 0x01000000
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#define I2C_SDA_OUT 0x02000000
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#define I2C_SCL_IN 0x04000000
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#define I2C_SDA_IN 0x08000000
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/* initialization states */
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#define INIT2 0x2
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#define INIT3 0x4
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/* delays */
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#define CYCLE_DELAY 10
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#define TIMEOUT (HZ / 2)
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static void __iomem *ioaddr;
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/* The voo GPIO registers don't have individual masks for each bit
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so we always have to read before writing. */
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static void bit_vooi2c_setscl(void *data, int val)
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{
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unsigned int r;
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r = readl(ioaddr + REG);
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if (val)
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r |= I2C_SCL_OUT;
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else
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r &= ~I2C_SCL_OUT;
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writel(r, ioaddr + REG);
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readl(ioaddr + REG); /* flush posted write */
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}
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static void bit_vooi2c_setsda(void *data, int val)
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{
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unsigned int r;
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r = readl(ioaddr + REG);
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if (val)
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r |= I2C_SDA_OUT;
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else
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r &= ~I2C_SDA_OUT;
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writel(r, ioaddr + REG);
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readl(ioaddr + REG); /* flush posted write */
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}
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/* The GPIO pins are open drain, so the pins always remain outputs.
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We rely on the i2c-algo-bit routines to set the pins high before
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reading the input from other chips. */
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static int bit_vooi2c_getscl(void *data)
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{
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return (0 != (readl(ioaddr + REG) & I2C_SCL_IN));
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}
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static int bit_vooi2c_getsda(void *data)
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{
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return (0 != (readl(ioaddr + REG) & I2C_SDA_IN));
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}
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static void bit_vooddc_setscl(void *data, int val)
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{
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unsigned int r;
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r = readl(ioaddr + REG);
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if (val)
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r |= DDC_SCL_OUT;
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else
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r &= ~DDC_SCL_OUT;
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writel(r, ioaddr + REG);
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readl(ioaddr + REG); /* flush posted write */
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}
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static void bit_vooddc_setsda(void *data, int val)
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{
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unsigned int r;
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r = readl(ioaddr + REG);
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if (val)
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r |= DDC_SDA_OUT;
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else
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r &= ~DDC_SDA_OUT;
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writel(r, ioaddr + REG);
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readl(ioaddr + REG); /* flush posted write */
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}
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static int bit_vooddc_getscl(void *data)
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{
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return (0 != (readl(ioaddr + REG) & DDC_SCL_IN));
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}
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static int bit_vooddc_getsda(void *data)
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{
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return (0 != (readl(ioaddr + REG) & DDC_SDA_IN));
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}
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static int config_v3(struct pci_dev *dev)
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{
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unsigned long cadr;
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/* map Voodoo3 memory */
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cadr = dev->resource[0].start;
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cadr &= PCI_BASE_ADDRESS_MEM_MASK;
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ioaddr = ioremap_nocache(cadr, 0x1000);
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if (ioaddr) {
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writel(0x8160, ioaddr + REG2);
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writel(0xcffc0020, ioaddr + REG);
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dev_info(&dev->dev, "Using Banshee/Voodoo3 I2C device at %p\n", ioaddr);
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return 0;
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}
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return -ENODEV;
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}
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static struct i2c_algo_bit_data voo_i2c_bit_data = {
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.setsda = bit_vooi2c_setsda,
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.setscl = bit_vooi2c_setscl,
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.getsda = bit_vooi2c_getsda,
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.getscl = bit_vooi2c_getscl,
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.udelay = CYCLE_DELAY,
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.timeout = TIMEOUT
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};
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static struct i2c_adapter voodoo3_i2c_adapter = {
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.owner = THIS_MODULE,
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.name = "I2C Voodoo3/Banshee adapter",
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.algo_data = &voo_i2c_bit_data,
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};
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static struct i2c_algo_bit_data voo_ddc_bit_data = {
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.setsda = bit_vooddc_setsda,
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.setscl = bit_vooddc_setscl,
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.getsda = bit_vooddc_getsda,
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.getscl = bit_vooddc_getscl,
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.udelay = CYCLE_DELAY,
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.timeout = TIMEOUT
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};
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static struct i2c_adapter voodoo3_ddc_adapter = {
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.owner = THIS_MODULE,
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.class = I2C_CLASS_DDC,
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.name = "DDC Voodoo3/Banshee adapter",
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.algo_data = &voo_ddc_bit_data,
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};
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static struct pci_device_id voodoo3_ids[] __devinitdata = {
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{ PCI_DEVICE(PCI_VENDOR_ID_3DFX, PCI_DEVICE_ID_3DFX_VOODOO3) },
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{ PCI_DEVICE(PCI_VENDOR_ID_3DFX, PCI_DEVICE_ID_3DFX_BANSHEE) },
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{ 0, }
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};
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MODULE_DEVICE_TABLE (pci, voodoo3_ids);
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static int __devinit voodoo3_probe(struct pci_dev *dev, const struct pci_device_id *id)
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{
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int retval;
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retval = config_v3(dev);
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if (retval)
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return retval;
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/* set up the sysfs linkage to our parent device */
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voodoo3_i2c_adapter.dev.parent = &dev->dev;
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voodoo3_ddc_adapter.dev.parent = &dev->dev;
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retval = i2c_bit_add_bus(&voodoo3_i2c_adapter);
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if (retval)
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return retval;
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retval = i2c_bit_add_bus(&voodoo3_ddc_adapter);
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if (retval)
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i2c_del_adapter(&voodoo3_i2c_adapter);
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return retval;
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}
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static void __devexit voodoo3_remove(struct pci_dev *dev)
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{
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i2c_del_adapter(&voodoo3_i2c_adapter);
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i2c_del_adapter(&voodoo3_ddc_adapter);
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iounmap(ioaddr);
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}
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static struct pci_driver voodoo3_driver = {
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.name = "voodoo3_smbus",
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.id_table = voodoo3_ids,
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.probe = voodoo3_probe,
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.remove = __devexit_p(voodoo3_remove),
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};
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static int __init i2c_voodoo3_init(void)
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{
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return pci_register_driver(&voodoo3_driver);
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}
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static void __exit i2c_voodoo3_exit(void)
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{
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pci_unregister_driver(&voodoo3_driver);
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}
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MODULE_AUTHOR("Frodo Looijaard <frodol@dds.nl>, "
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"Philip Edelbrock <phil@netroedge.com>, "
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"Ralph Metzler <rjkm@thp.uni-koeln.de>, "
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"and Mark D. Studebaker <mdsxyz123@yahoo.com>");
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MODULE_DESCRIPTION("Voodoo3 I2C/SMBus driver");
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MODULE_LICENSE("GPL");
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module_init(i2c_voodoo3_init);
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module_exit(i2c_voodoo3_exit);
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