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455 lines
12 KiB
455 lines
12 KiB
/*
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i2c-viapro.c - Part of lm_sensors, Linux kernel modules for hardware
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monitoring
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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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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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/*
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Supports Via devices:
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82C596A/B (0x3050)
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82C596B (0x3051)
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82C686A/B
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8231
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8233
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8233A (0x3147 and 0x3177)
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8235
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8237
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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/sched.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 <asm/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 SMBHSLVSTS (vt596_smba + 1)
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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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#define SMBSLVCNT (vt596_smba + 8)
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#define SMBSHDWCMD (vt596_smba + 9)
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#define SMBSLVEVT (vt596_smba + 0xA)
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#define SMBSLVDAT (vt596_smba + 0xC)
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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 smb_cf_hstcfg = 0xD2;
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#define SMBHSTCFG (smb_cf_hstcfg)
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#define SMBSLVC (smb_cf_hstcfg + 1)
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#define SMBSHDW1 (smb_cf_hstcfg + 2)
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#define SMBSHDW2 (smb_cf_hstcfg + 3)
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#define SMBREV (smb_cf_hstcfg + 4)
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/* Other settings */
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#define MAX_TIMEOUT 500
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#define ENABLE_INT9 0
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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_BLOCK_DATA 0x14
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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 int 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(force_addr, ushort, 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 i2c_adapter vt596_adapter;
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/* Another internally used function */
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static int vt596_transaction(void)
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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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dev_dbg(&vt596_adapter.dev, "Transaction (pre): CNT=%02x, CMD=%02x, "
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"ADD=%02x, DAT0=%02x, DAT1=%02x\n", 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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/* 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_dbg(&vt596_adapter.dev, "Failed! (0x%02x)\n", temp);
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return -1;
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} else {
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dev_dbg(&vt596_adapter.dev, "Successfull!\n");
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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(inb(SMBHSTCNT) | 0x040, SMBHSTCNT);
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/* We will always wait for a fraction of a second!
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I don't know if VIA needs this, Intel did */
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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 = -1;
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dev_dbg(&vt596_adapter.dev, "SMBus Timeout!\n");
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}
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if (temp & 0x10) {
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result = -1;
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dev_dbg(&vt596_adapter.dev, "Error: Failed bus transaction\n");
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}
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if (temp & 0x08) {
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result = -1;
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dev_info(&vt596_adapter.dev, "Bus collision! SMBus may be "
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"locked until next hard\nreset. (sorry!)\n");
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/* Clock stops and slave is stuck in mid-transmission */
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}
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if (temp & 0x04) {
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result = -1;
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dev_dbg(&vt596_adapter.dev, "Error: no response!\n");
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}
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if ((temp = inb_p(SMBHSTSTS)) & 0x1F) {
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outb_p(temp, SMBHSTSTS);
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if ((temp = inb_p(SMBHSTSTS)) & 0x1F) {
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dev_warn(&vt596_adapter.dev, "Failed reset at end "
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"of transaction (%02x)\n", temp);
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}
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}
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dev_dbg(&vt596_adapter.dev, "Transaction (post): CNT=%02x, CMD=%02x, "
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"ADD=%02x, DAT0=%02x, DAT1=%02x\n", 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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return result;
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}
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/* Return -1 on error. */
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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, len;
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switch (size) {
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case I2C_SMBUS_PROC_CALL:
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dev_info(&vt596_adapter.dev,
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"I2C_SMBUS_PROC_CALL not supported!\n");
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return -1;
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case I2C_SMBUS_QUICK:
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outb_p(((addr & 0x7f) << 1) | (read_write & 0x01),
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SMBHSTADD);
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size = VT596_QUICK;
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break;
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case I2C_SMBUS_BYTE:
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outb_p(((addr & 0x7f) << 1) | (read_write & 0x01),
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SMBHSTADD);
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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(((addr & 0x7f) << 1) | (read_write & 0x01),
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SMBHSTADD);
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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(((addr & 0x7f) << 1) | (read_write & 0x01),
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SMBHSTADD);
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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_BLOCK_DATA:
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outb_p(((addr & 0x7f) << 1) | (read_write & 0x01),
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SMBHSTADD);
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outb_p(command, SMBHSTCMD);
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if (read_write == I2C_SMBUS_WRITE) {
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len = data->block[0];
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if (len < 0)
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len = 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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i = 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 = VT596_BLOCK_DATA;
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break;
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}
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outb_p((size & 0x1C) + (ENABLE_INT9 & 1), SMBHSTCNT);
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if (vt596_transaction()) /* Error in transaction */
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return -1;
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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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/* Where is the result put? I assume here it is in
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* SMBHSTDAT0 but it might just as well be in the
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* SMBHSTCMD. No clue in the docs
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*/
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data->byte = inb_p(SMBHSTDAT0);
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break;
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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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data->word = inb_p(SMBHSTDAT0) + (inb_p(SMBHSTDAT1) << 8);
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break;
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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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i = 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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}
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static u32 vt596_func(struct i2c_adapter *adapter)
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{
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return 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_FUNC_SMBUS_BLOCK_DATA;
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}
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static 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,
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.algo = &smbus_algorithm,
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.name = "unset",
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};
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static int __devinit 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 = -ENODEV;
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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 & 0x1)) {
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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 & 0x1)) {
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smb_cf_hstcfg = 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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if (!request_region(vt596_smba, 8, "viapro-smbus")) {
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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 & 1) == 0) {
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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 | 1);
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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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goto release_region;
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}
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}
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if ((temp & 0x0E) == 8)
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dev_dbg(&pdev->dev, "using Interrupt 9 for SMBus.\n");
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else if ((temp & 0x0E) == 0)
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dev_dbg(&pdev->dev, "using Interrupt SMI# for SMBus.\n");
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else
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dev_dbg(&pdev->dev, "Illegal Interrupt configuration "
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"(or code out of date)!\n");
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pci_read_config_byte(pdev, SMBREV, &temp);
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dev_dbg(&pdev->dev, "SMBREV = 0x%X\n", temp);
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dev_dbg(&pdev->dev, "VT596_smba = 0x%X\n", vt596_smba);
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vt596_adapter.dev.parent = &pdev->dev;
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snprintf(vt596_adapter.name, I2C_NAME_SIZE,
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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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if (i2c_add_adapter(&vt596_adapter)) {
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pci_dev_put(vt596_pdev);
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vt596_pdev = NULL;
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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 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_8231_4),
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.driver_data = SMBBA1 },
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{ 0, }
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};
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MODULE_DEVICE_TABLE (pci, vt596_ids);
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static struct pci_driver vt596_driver = {
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.name = "vt596_smbus",
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.id_table = vt596_ids,
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.probe = vt596_probe,
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};
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static int __init i2c_vt596_init(void)
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{
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return pci_register_driver(&vt596_driver);
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}
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static void __exit i2c_vt596_exit(void)
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{
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pci_unregister_driver(&vt596_driver);
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if (vt596_pdev != NULL) {
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i2c_del_adapter(&vt596_adapter);
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release_region(vt596_smba, 8);
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pci_dev_put(vt596_pdev);
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vt596_pdev = NULL;
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}
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}
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MODULE_AUTHOR(
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"Frodo Looijaard <frodol@dds.nl> and "
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"Philip Edelbrock <phil@netroedge.com>");
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MODULE_DESCRIPTION("vt82c596 SMBus driver");
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MODULE_LICENSE("GPL");
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module_init(i2c_vt596_init);
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module_exit(i2c_vt596_exit);
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|