500 lines
14 KiB
C
500 lines
14 KiB
C
// SPDX-License-Identifier: GPL-2.0-or-later
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/*
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Copyright (c) 1998 - 2002 Frodo Looijaard <frodol@dds.nl>,
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Philip Edelbrock <phil@netroedge.com>, Kyösti Mälkki <kmalkki@cc.hut.fi>,
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Mark D. Studebaker <mdsxyz123@yahoo.com>
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Copyright (C) 2005 - 2008 Jean Delvare <jdelvare@suse.de>
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*/
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/*
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Supports the following VIA south bridges:
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Chip name PCI ID REV I2C block
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VT82C596A 0x3050 no
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VT82C596B 0x3051 no
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VT82C686A 0x3057 0x30 no
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VT82C686B 0x3057 0x40 yes
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VT8231 0x8235 no?
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VT8233 0x3074 yes
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VT8233A 0x3147 yes?
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VT8235 0x3177 yes
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VT8237R 0x3227 yes
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VT8237A 0x3337 yes
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VT8237S 0x3372 yes
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VT8251 0x3287 yes
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CX700 0x8324 yes
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VX800/VX820 0x8353 yes
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VX855/VX875 0x8409 yes
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Note: we assume there can only be one device, with one SMBus interface.
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*/
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#include <linux/module.h>
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#include <linux/delay.h>
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#include <linux/pci.h>
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#include <linux/kernel.h>
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#include <linux/stddef.h>
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#include <linux/ioport.h>
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#include <linux/i2c.h>
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#include <linux/init.h>
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#include <linux/acpi.h>
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#include <linux/io.h>
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static struct pci_dev *vt596_pdev;
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#define SMBBA1 0x90
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#define SMBBA2 0x80
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#define SMBBA3 0xD0
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/* SMBus address offsets */
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static unsigned short vt596_smba;
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#define SMBHSTSTS (vt596_smba + 0)
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#define SMBHSTCNT (vt596_smba + 2)
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#define SMBHSTCMD (vt596_smba + 3)
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#define SMBHSTADD (vt596_smba + 4)
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#define SMBHSTDAT0 (vt596_smba + 5)
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#define SMBHSTDAT1 (vt596_smba + 6)
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#define SMBBLKDAT (vt596_smba + 7)
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/* PCI Address Constants */
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/* SMBus data in configuration space can be found in two places,
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We try to select the better one */
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static unsigned short SMBHSTCFG = 0xD2;
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/* Other settings */
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#define MAX_TIMEOUT 500
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/* VT82C596 constants */
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#define VT596_QUICK 0x00
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#define VT596_BYTE 0x04
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#define VT596_BYTE_DATA 0x08
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#define VT596_WORD_DATA 0x0C
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#define VT596_PROC_CALL 0x10
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#define VT596_BLOCK_DATA 0x14
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#define VT596_I2C_BLOCK_DATA 0x34
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/* If force is set to anything different from 0, we forcibly enable the
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VT596. DANGEROUS! */
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static bool force;
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module_param(force, bool, 0);
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MODULE_PARM_DESC(force, "Forcibly enable the SMBus. DANGEROUS!");
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/* If force_addr is set to anything different from 0, we forcibly enable
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the VT596 at the given address. VERY DANGEROUS! */
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static u16 force_addr;
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module_param_hw(force_addr, ushort, ioport, 0);
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MODULE_PARM_DESC(force_addr,
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"Forcibly enable the SMBus at the given address. "
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"EXTREMELY DANGEROUS!");
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static struct pci_driver vt596_driver;
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static struct i2c_adapter vt596_adapter;
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#define FEATURE_I2CBLOCK (1<<0)
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static unsigned int vt596_features;
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#ifdef DEBUG
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static void vt596_dump_regs(const char *msg, u8 size)
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{
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dev_dbg(&vt596_adapter.dev, "%s: STS=%02x CNT=%02x CMD=%02x ADD=%02x "
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"DAT=%02x,%02x\n", msg, inb_p(SMBHSTSTS), inb_p(SMBHSTCNT),
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inb_p(SMBHSTCMD), inb_p(SMBHSTADD), inb_p(SMBHSTDAT0),
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inb_p(SMBHSTDAT1));
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if (size == VT596_BLOCK_DATA
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|| size == VT596_I2C_BLOCK_DATA) {
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int i;
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dev_dbg(&vt596_adapter.dev, "BLK=");
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for (i = 0; i < I2C_SMBUS_BLOCK_MAX / 2; i++)
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printk("%02x,", inb_p(SMBBLKDAT));
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printk("\n");
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dev_dbg(&vt596_adapter.dev, " ");
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for (; i < I2C_SMBUS_BLOCK_MAX - 1; i++)
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printk("%02x,", inb_p(SMBBLKDAT));
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printk("%02x\n", inb_p(SMBBLKDAT));
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}
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}
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#else
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static inline void vt596_dump_regs(const char *msg, u8 size) { }
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#endif
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/* Return -1 on error, 0 on success */
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static int vt596_transaction(u8 size)
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{
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int temp;
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int result = 0;
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int timeout = 0;
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vt596_dump_regs("Transaction (pre)", size);
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/* Make sure the SMBus host is ready to start transmitting */
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if ((temp = inb_p(SMBHSTSTS)) & 0x1F) {
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dev_dbg(&vt596_adapter.dev, "SMBus busy (0x%02x). "
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"Resetting...\n", temp);
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outb_p(temp, SMBHSTSTS);
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if ((temp = inb_p(SMBHSTSTS)) & 0x1F) {
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dev_err(&vt596_adapter.dev, "SMBus reset failed! "
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"(0x%02x)\n", temp);
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return -EBUSY;
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}
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}
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/* Start the transaction by setting bit 6 */
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outb_p(0x40 | size, SMBHSTCNT);
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/* We will always wait for a fraction of a second */
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do {
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msleep(1);
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temp = inb_p(SMBHSTSTS);
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} while ((temp & 0x01) && (++timeout < MAX_TIMEOUT));
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/* If the SMBus is still busy, we give up */
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if (timeout == MAX_TIMEOUT) {
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result = -ETIMEDOUT;
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dev_err(&vt596_adapter.dev, "SMBus timeout!\n");
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}
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if (temp & 0x10) {
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result = -EIO;
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dev_err(&vt596_adapter.dev, "Transaction failed (0x%02x)\n",
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size);
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}
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if (temp & 0x08) {
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result = -EIO;
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dev_err(&vt596_adapter.dev, "SMBus collision!\n");
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}
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if (temp & 0x04) {
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result = -ENXIO;
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dev_dbg(&vt596_adapter.dev, "No response\n");
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}
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/* Resetting status register */
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if (temp & 0x1F)
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outb_p(temp, SMBHSTSTS);
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vt596_dump_regs("Transaction (post)", size);
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return result;
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}
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/* Return negative errno on error, 0 on success */
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static s32 vt596_access(struct i2c_adapter *adap, u16 addr,
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unsigned short flags, char read_write, u8 command,
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int size, union i2c_smbus_data *data)
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{
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int i;
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int status;
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switch (size) {
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case I2C_SMBUS_QUICK:
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size = VT596_QUICK;
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break;
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case I2C_SMBUS_BYTE:
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if (read_write == I2C_SMBUS_WRITE)
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outb_p(command, SMBHSTCMD);
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size = VT596_BYTE;
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break;
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case I2C_SMBUS_BYTE_DATA:
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outb_p(command, SMBHSTCMD);
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if (read_write == I2C_SMBUS_WRITE)
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outb_p(data->byte, SMBHSTDAT0);
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size = VT596_BYTE_DATA;
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break;
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case I2C_SMBUS_WORD_DATA:
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outb_p(command, SMBHSTCMD);
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if (read_write == I2C_SMBUS_WRITE) {
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outb_p(data->word & 0xff, SMBHSTDAT0);
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outb_p((data->word & 0xff00) >> 8, SMBHSTDAT1);
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}
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size = VT596_WORD_DATA;
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break;
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case I2C_SMBUS_PROC_CALL:
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outb_p(command, SMBHSTCMD);
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outb_p(data->word & 0xff, SMBHSTDAT0);
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outb_p((data->word & 0xff00) >> 8, SMBHSTDAT1);
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size = VT596_PROC_CALL;
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break;
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case I2C_SMBUS_I2C_BLOCK_DATA:
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if (!(vt596_features & FEATURE_I2CBLOCK))
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goto exit_unsupported;
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if (read_write == I2C_SMBUS_READ)
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outb_p(data->block[0], SMBHSTDAT0);
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fallthrough;
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case I2C_SMBUS_BLOCK_DATA:
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outb_p(command, SMBHSTCMD);
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if (read_write == I2C_SMBUS_WRITE) {
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u8 len = data->block[0];
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if (len > I2C_SMBUS_BLOCK_MAX)
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len = I2C_SMBUS_BLOCK_MAX;
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outb_p(len, SMBHSTDAT0);
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inb_p(SMBHSTCNT); /* Reset SMBBLKDAT */
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for (i = 1; i <= len; i++)
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outb_p(data->block[i], SMBBLKDAT);
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}
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size = (size == I2C_SMBUS_I2C_BLOCK_DATA) ?
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VT596_I2C_BLOCK_DATA : VT596_BLOCK_DATA;
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break;
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default:
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goto exit_unsupported;
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}
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outb_p(((addr & 0x7f) << 1) | read_write, SMBHSTADD);
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status = vt596_transaction(size);
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if (status)
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return status;
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if (size == VT596_PROC_CALL)
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read_write = I2C_SMBUS_READ;
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if ((read_write == I2C_SMBUS_WRITE) || (size == VT596_QUICK))
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return 0;
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switch (size) {
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case VT596_BYTE:
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case VT596_BYTE_DATA:
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data->byte = inb_p(SMBHSTDAT0);
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break;
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case VT596_WORD_DATA:
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case VT596_PROC_CALL:
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data->word = inb_p(SMBHSTDAT0) + (inb_p(SMBHSTDAT1) << 8);
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break;
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case VT596_I2C_BLOCK_DATA:
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case VT596_BLOCK_DATA:
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data->block[0] = inb_p(SMBHSTDAT0);
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if (data->block[0] > I2C_SMBUS_BLOCK_MAX)
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data->block[0] = I2C_SMBUS_BLOCK_MAX;
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inb_p(SMBHSTCNT); /* Reset SMBBLKDAT */
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for (i = 1; i <= data->block[0]; i++)
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data->block[i] = inb_p(SMBBLKDAT);
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break;
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}
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return 0;
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exit_unsupported:
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dev_warn(&vt596_adapter.dev, "Unsupported transaction %d\n",
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size);
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return -EOPNOTSUPP;
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}
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static u32 vt596_func(struct i2c_adapter *adapter)
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{
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u32 func = I2C_FUNC_SMBUS_QUICK | I2C_FUNC_SMBUS_BYTE |
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I2C_FUNC_SMBUS_BYTE_DATA | I2C_FUNC_SMBUS_WORD_DATA |
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I2C_SMBUS_PROC_CALL | I2C_FUNC_SMBUS_BLOCK_DATA;
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if (vt596_features & FEATURE_I2CBLOCK)
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func |= I2C_FUNC_SMBUS_I2C_BLOCK;
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return func;
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}
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static const struct i2c_algorithm smbus_algorithm = {
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.smbus_xfer = vt596_access,
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.functionality = vt596_func,
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};
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static struct i2c_adapter vt596_adapter = {
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.owner = THIS_MODULE,
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.class = I2C_CLASS_HWMON | I2C_CLASS_SPD,
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.algo = &smbus_algorithm,
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};
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static int vt596_probe(struct pci_dev *pdev,
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const struct pci_device_id *id)
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{
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unsigned char temp;
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int error;
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/* Determine the address of the SMBus areas */
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if (force_addr) {
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vt596_smba = force_addr & 0xfff0;
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force = 0;
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goto found;
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}
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if ((pci_read_config_word(pdev, id->driver_data, &vt596_smba)) ||
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!(vt596_smba & 0x0001)) {
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/* try 2nd address and config reg. for 596 */
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if (id->device == PCI_DEVICE_ID_VIA_82C596_3 &&
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!pci_read_config_word(pdev, SMBBA2, &vt596_smba) &&
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(vt596_smba & 0x0001)) {
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SMBHSTCFG = 0x84;
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} else {
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/* no matches at all */
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dev_err(&pdev->dev, "Cannot configure "
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"SMBus I/O Base address\n");
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return -ENODEV;
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}
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}
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vt596_smba &= 0xfff0;
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if (vt596_smba == 0) {
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dev_err(&pdev->dev, "SMBus base address "
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"uninitialized - upgrade BIOS or use "
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"force_addr=0xaddr\n");
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return -ENODEV;
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}
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found:
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error = acpi_check_region(vt596_smba, 8, vt596_driver.name);
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if (error)
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return -ENODEV;
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if (!request_region(vt596_smba, 8, vt596_driver.name)) {
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dev_err(&pdev->dev, "SMBus region 0x%x already in use!\n",
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vt596_smba);
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return -ENODEV;
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}
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pci_read_config_byte(pdev, SMBHSTCFG, &temp);
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/* If force_addr is set, we program the new address here. Just to make
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sure, we disable the VT596 first. */
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if (force_addr) {
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pci_write_config_byte(pdev, SMBHSTCFG, temp & 0xfe);
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pci_write_config_word(pdev, id->driver_data, vt596_smba);
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pci_write_config_byte(pdev, SMBHSTCFG, temp | 0x01);
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dev_warn(&pdev->dev, "WARNING: SMBus interface set to new "
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"address 0x%04x!\n", vt596_smba);
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} else if (!(temp & 0x01)) {
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if (force) {
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/* NOTE: This assumes I/O space and other allocations
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* WERE done by the Bios! Don't complain if your
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* hardware does weird things after enabling this.
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* :') Check for Bios updates before resorting to
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* this.
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*/
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pci_write_config_byte(pdev, SMBHSTCFG, temp | 0x01);
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dev_info(&pdev->dev, "Enabling SMBus device\n");
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} else {
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dev_err(&pdev->dev, "SMBUS: Error: Host SMBus "
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"controller not enabled! - upgrade BIOS or "
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"use force=1\n");
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error = -ENODEV;
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goto release_region;
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}
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}
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dev_dbg(&pdev->dev, "VT596_smba = 0x%X\n", vt596_smba);
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switch (pdev->device) {
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case PCI_DEVICE_ID_VIA_CX700:
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case PCI_DEVICE_ID_VIA_VX800:
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case PCI_DEVICE_ID_VIA_VX855:
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case PCI_DEVICE_ID_VIA_VX900:
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case PCI_DEVICE_ID_VIA_8251:
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case PCI_DEVICE_ID_VIA_8237:
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case PCI_DEVICE_ID_VIA_8237A:
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case PCI_DEVICE_ID_VIA_8237S:
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case PCI_DEVICE_ID_VIA_8235:
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case PCI_DEVICE_ID_VIA_8233A:
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case PCI_DEVICE_ID_VIA_8233_0:
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vt596_features |= FEATURE_I2CBLOCK;
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break;
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case PCI_DEVICE_ID_VIA_82C686_4:
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/* The VT82C686B (rev 0x40) does support I2C block
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transactions, but the VT82C686A (rev 0x30) doesn't */
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if (pdev->revision >= 0x40)
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vt596_features |= FEATURE_I2CBLOCK;
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break;
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}
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vt596_adapter.dev.parent = &pdev->dev;
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snprintf(vt596_adapter.name, sizeof(vt596_adapter.name),
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"SMBus Via Pro adapter at %04x", vt596_smba);
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vt596_pdev = pci_dev_get(pdev);
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error = i2c_add_adapter(&vt596_adapter);
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if (error) {
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pci_dev_put(vt596_pdev);
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vt596_pdev = NULL;
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goto release_region;
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}
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/* Always return failure here. This is to allow other drivers to bind
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* to this pci device. We don't really want to have control over the
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* pci device, we only wanted to read as few register values from it.
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*/
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return -ENODEV;
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release_region:
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release_region(vt596_smba, 8);
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return error;
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}
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static const struct pci_device_id vt596_ids[] = {
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{ PCI_DEVICE(PCI_VENDOR_ID_VIA, PCI_DEVICE_ID_VIA_82C596_3),
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.driver_data = SMBBA1 },
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{ PCI_DEVICE(PCI_VENDOR_ID_VIA, PCI_DEVICE_ID_VIA_82C596B_3),
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.driver_data = SMBBA1 },
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{ PCI_DEVICE(PCI_VENDOR_ID_VIA, PCI_DEVICE_ID_VIA_82C686_4),
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.driver_data = SMBBA1 },
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{ PCI_DEVICE(PCI_VENDOR_ID_VIA, PCI_DEVICE_ID_VIA_8233_0),
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.driver_data = SMBBA3 },
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{ PCI_DEVICE(PCI_VENDOR_ID_VIA, PCI_DEVICE_ID_VIA_8233A),
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.driver_data = SMBBA3 },
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{ PCI_DEVICE(PCI_VENDOR_ID_VIA, PCI_DEVICE_ID_VIA_8235),
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.driver_data = SMBBA3 },
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{ PCI_DEVICE(PCI_VENDOR_ID_VIA, PCI_DEVICE_ID_VIA_8237),
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.driver_data = SMBBA3 },
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{ PCI_DEVICE(PCI_VENDOR_ID_VIA, PCI_DEVICE_ID_VIA_8237A),
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.driver_data = SMBBA3 },
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{ PCI_DEVICE(PCI_VENDOR_ID_VIA, PCI_DEVICE_ID_VIA_8237S),
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.driver_data = SMBBA3 },
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{ PCI_DEVICE(PCI_VENDOR_ID_VIA, PCI_DEVICE_ID_VIA_8231_4),
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.driver_data = SMBBA1 },
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{ PCI_DEVICE(PCI_VENDOR_ID_VIA, PCI_DEVICE_ID_VIA_8251),
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.driver_data = SMBBA3 },
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{ PCI_DEVICE(PCI_VENDOR_ID_VIA, PCI_DEVICE_ID_VIA_CX700),
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.driver_data = SMBBA3 },
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{ PCI_DEVICE(PCI_VENDOR_ID_VIA, PCI_DEVICE_ID_VIA_VX800),
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.driver_data = SMBBA3 },
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{ PCI_DEVICE(PCI_VENDOR_ID_VIA, PCI_DEVICE_ID_VIA_VX855),
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.driver_data = SMBBA3 },
|
|
{ PCI_DEVICE(PCI_VENDOR_ID_VIA, PCI_DEVICE_ID_VIA_VX900),
|
|
.driver_data = SMBBA3 },
|
|
{ 0, }
|
|
};
|
|
|
|
MODULE_DEVICE_TABLE(pci, vt596_ids);
|
|
|
|
static struct pci_driver vt596_driver = {
|
|
.name = "vt596_smbus",
|
|
.id_table = vt596_ids,
|
|
.probe = vt596_probe,
|
|
};
|
|
|
|
static int __init i2c_vt596_init(void)
|
|
{
|
|
return pci_register_driver(&vt596_driver);
|
|
}
|
|
|
|
|
|
static void __exit i2c_vt596_exit(void)
|
|
{
|
|
pci_unregister_driver(&vt596_driver);
|
|
if (vt596_pdev != NULL) {
|
|
i2c_del_adapter(&vt596_adapter);
|
|
release_region(vt596_smba, 8);
|
|
pci_dev_put(vt596_pdev);
|
|
vt596_pdev = NULL;
|
|
}
|
|
}
|
|
|
|
MODULE_AUTHOR("Kyosti Malkki <kmalkki@cc.hut.fi>");
|
|
MODULE_AUTHOR("Mark D. Studebaker <mdsxyz123@yahoo.com>");
|
|
MODULE_AUTHOR("Jean Delvare <jdelvare@suse.de>");
|
|
MODULE_DESCRIPTION("vt82c596 SMBus driver");
|
|
MODULE_LICENSE("GPL");
|
|
|
|
module_init(i2c_vt596_init);
|
|
module_exit(i2c_vt596_exit);
|