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