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linux/drivers/i2c/busses/i2c-prosavage.c

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/*
* kernel/busses/i2c-prosavage.c
*
* i2c bus driver for S3/VIA 8365/8375 graphics processor.
* Copyright (c) 2003 Henk Vergonet <henk@god.dyndns.org>
* Based on code written by:
* Frodo Looijaard <frodol@dds.nl>,
* Philip Edelbrock <phil@netroedge.com>,
* Ralph Metzler <rjkm@thp.uni-koeln.de>, and
* Mark D. Studebaker <mdsxyz123@yahoo.com>
* Simon Vogl
* and others
*
* Please read the lm_sensors documentation for details on use.
*
* 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.
*
*/
/* 18-05-2003 HVE - created
* 14-06-2003 HVE - adapted for lm_sensors2
* 17-06-2003 HVE - linux 2.5.xx compatible
* 18-06-2003 HVE - codingstyle
* 21-06-2003 HVE - compatibility lm_sensors2 and linux 2.5.xx
* codingstyle, mmio enabled
*
* This driver interfaces to the I2C bus of the VIA north bridge embedded
* ProSavage4/8 devices. Usefull for gaining access to the TV Encoder chips.
*
* Graphics cores:
* S3/VIA KM266/VT8375 aka ProSavage8
* S3/VIA KM133/VT8365 aka Savage4
*
* Two serial busses are implemented:
* SERIAL1 - I2C serial communications interface
* SERIAL2 - DDC2 monitor communications interface
*
* Tested on a FX41 mainboard, see http://www.shuttle.com
*
*
* TODO:
* - integration with prosavage framebuffer device
* (Additional documentation needed :(
*/
#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>
/*
* driver configuration
*/
#define MAX_BUSSES 2
struct s_i2c_bus {
void __iomem *mmvga;
int i2c_reg;
int adap_ok;
struct i2c_adapter adap;
struct i2c_algo_bit_data algo;
};
struct s_i2c_chip {
void __iomem *mmio;
struct s_i2c_bus i2c_bus[MAX_BUSSES];
};
/*
* i2c configuration
*/
#define CYCLE_DELAY 10
#define TIMEOUT (HZ / 2)
/*
* S3/VIA 8365/8375 registers
*/
#define VGA_CR_IX 0x3d4
#define VGA_CR_DATA 0x3d5
#define CR_SERIAL1 0xa0 /* I2C serial communications interface */
#define MM_SERIAL1 0xff20
#define CR_SERIAL2 0xb1 /* DDC2 monitor communications interface */
/* based on vt8365 documentation */
#define I2C_ENAB 0x10
#define I2C_SCL_OUT 0x01
#define I2C_SDA_OUT 0x02
#define I2C_SCL_IN 0x04
#define I2C_SDA_IN 0x08
#define SET_CR_IX(p, val) writeb((val), (p)->mmvga + VGA_CR_IX)
#define SET_CR_DATA(p, val) writeb((val), (p)->mmvga + VGA_CR_DATA)
#define GET_CR_DATA(p) readb((p)->mmvga + VGA_CR_DATA)
/*
* Serial bus line handling
*
* serial communications register as parameter in private data
*
* TODO: locks with other code sections accessing video registers?
*/
static void bit_s3via_setscl(void *bus, int val)
{
struct s_i2c_bus *p = (struct s_i2c_bus *)bus;
unsigned int r;
SET_CR_IX(p, p->i2c_reg);
r = GET_CR_DATA(p);
r |= I2C_ENAB;
if (val) {
r |= I2C_SCL_OUT;
} else {
r &= ~I2C_SCL_OUT;
}
SET_CR_DATA(p, r);
}
static void bit_s3via_setsda(void *bus, int val)
{
struct s_i2c_bus *p = (struct s_i2c_bus *)bus;
unsigned int r;
SET_CR_IX(p, p->i2c_reg);
r = GET_CR_DATA(p);
r |= I2C_ENAB;
if (val) {
r |= I2C_SDA_OUT;
} else {
r &= ~I2C_SDA_OUT;
}
SET_CR_DATA(p, r);
}
static int bit_s3via_getscl(void *bus)
{
struct s_i2c_bus *p = (struct s_i2c_bus *)bus;
SET_CR_IX(p, p->i2c_reg);
return (0 != (GET_CR_DATA(p) & I2C_SCL_IN));
}
static int bit_s3via_getsda(void *bus)
{
struct s_i2c_bus *p = (struct s_i2c_bus *)bus;
SET_CR_IX(p, p->i2c_reg);
return (0 != (GET_CR_DATA(p) & I2C_SDA_IN));
}
/*
* adapter initialisation
*/
static int i2c_register_bus(struct pci_dev *dev, struct s_i2c_bus *p, void __iomem *mmvga, u32 i2c_reg)
{
int ret;
p->adap.owner = THIS_MODULE;
p->adap.id = I2C_HW_B_S3VIA;
p->adap.algo_data = &p->algo;
p->adap.dev.parent = &dev->dev;
p->algo.setsda = bit_s3via_setsda;
p->algo.setscl = bit_s3via_setscl;
p->algo.getsda = bit_s3via_getsda;
p->algo.getscl = bit_s3via_getscl;
p->algo.udelay = CYCLE_DELAY;
p->algo.mdelay = CYCLE_DELAY;
p->algo.timeout = TIMEOUT;
p->algo.data = p;
p->mmvga = mmvga;
p->i2c_reg = i2c_reg;
ret = i2c_bit_add_bus(&p->adap);
if (ret) {
return ret;
}
p->adap_ok = 1;
return 0;
}
/*
* Cleanup stuff
*/
static void prosavage_remove(struct pci_dev *dev)
{
struct s_i2c_chip *chip;
int i, ret;
chip = (struct s_i2c_chip *)pci_get_drvdata(dev);
if (!chip) {
return;
}
for (i = MAX_BUSSES - 1; i >= 0; i--) {
if (chip->i2c_bus[i].adap_ok == 0)
continue;
ret = i2c_bit_del_bus(&chip->i2c_bus[i].adap);
if (ret) {
dev_err(&dev->dev, "%s not removed\n",
chip->i2c_bus[i].adap.name);
}
}
if (chip->mmio) {
iounmap(chip->mmio);
}
kfree(chip);
}
/*
* Detect chip and initialize it
*/
static int __devinit prosavage_probe(struct pci_dev *dev, const struct pci_device_id *id)
{
int ret;
unsigned long base, len;
struct s_i2c_chip *chip;
struct s_i2c_bus *bus;
pci_set_drvdata(dev, kzalloc(sizeof(struct s_i2c_chip), GFP_KERNEL));
chip = (struct s_i2c_chip *)pci_get_drvdata(dev);
if (chip == NULL) {
return -ENOMEM;
}
base = dev->resource[0].start & PCI_BASE_ADDRESS_MEM_MASK;
len = dev->resource[0].end - base + 1;
chip->mmio = ioremap_nocache(base, len);
if (chip->mmio == NULL) {
dev_err(&dev->dev, "ioremap failed\n");
prosavage_remove(dev);
return -ENODEV;
}
/*
* Chip initialisation
*/
/* Unlock Extended IO Space ??? */
/*
* i2c bus registration
*/
bus = &chip->i2c_bus[0];
snprintf(bus->adap.name, sizeof(bus->adap.name),
"ProSavage I2C bus at %02x:%02x.%x",
dev->bus->number, PCI_SLOT(dev->devfn), PCI_FUNC(dev->devfn));
ret = i2c_register_bus(dev, bus, chip->mmio + 0x8000, CR_SERIAL1);
if (ret) {
goto err_adap;
}
/*
* ddc bus registration
*/
bus = &chip->i2c_bus[1];
snprintf(bus->adap.name, sizeof(bus->adap.name),
"ProSavage DDC bus at %02x:%02x.%x",
dev->bus->number, PCI_SLOT(dev->devfn), PCI_FUNC(dev->devfn));
ret = i2c_register_bus(dev, bus, chip->mmio + 0x8000, CR_SERIAL2);
if (ret) {
goto err_adap;
}
return 0;
err_adap:
dev_err(&dev->dev, "%s failed\n", bus->adap.name);
prosavage_remove(dev);
return ret;
}
/*
* Data for PCI driver interface
*/
static struct pci_device_id prosavage_pci_tbl[] = {
{ PCI_DEVICE(PCI_VENDOR_ID_S3, PCI_DEVICE_ID_S3_SAVAGE4) },
{ PCI_DEVICE(PCI_VENDOR_ID_S3, PCI_DEVICE_ID_S3_PROSAVAGE8) },
{ 0, },
};
MODULE_DEVICE_TABLE (pci, prosavage_pci_tbl);
static struct pci_driver prosavage_driver = {
.name = "prosavage_smbus",
.id_table = prosavage_pci_tbl,
.probe = prosavage_probe,
.remove = prosavage_remove,
};
static int __init i2c_prosavage_init(void)
{
return pci_register_driver(&prosavage_driver);
}
static void __exit i2c_prosavage_exit(void)
{
pci_unregister_driver(&prosavage_driver);
}
MODULE_DEVICE_TABLE(pci, prosavage_pci_tbl);
MODULE_AUTHOR("Henk Vergonet");
MODULE_DESCRIPTION("ProSavage VIA 8365/8375 smbus driver");
MODULE_LICENSE("GPL");
module_init (i2c_prosavage_init);
module_exit (i2c_prosavage_exit);
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