414 lines
11 KiB
C
Executable File
414 lines
11 KiB
C
Executable File
/*
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Copyright (c) 1999-2002 Merlin Hughes <merlin@merlin.org>
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Shamelessly ripped from i2c-piix4.c:
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Copyright (c) 1998, 1999 Frodo Looijaard <frodol@dds.nl> and
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Philip Edelbrock <phil@netroedge.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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*/
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/*
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2002-04-08: Added nForce support. (Csaba Halasz)
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2002-10-03: Fixed nForce PnP I/O port. (Michael Steil)
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2002-12-28: Rewritten into something that resembles a Linux driver (hch)
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2003-11-29: Added back AMD8111 removed by the previous rewrite.
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(Philip Pokorny)
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*/
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/*
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Supports AMD756, AMD766, AMD768, AMD8111 and nVidia nForce
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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/pci.h>
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#include <linux/kernel.h>
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#include <linux/delay.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/acpi.h>
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#include <linux/io.h>
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/* AMD756 SMBus address offsets */
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#define SMB_ADDR_OFFSET 0xE0
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#define SMB_IOSIZE 16
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#define SMB_GLOBAL_STATUS (0x0 + amd756_ioport)
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#define SMB_GLOBAL_ENABLE (0x2 + amd756_ioport)
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#define SMB_HOST_ADDRESS (0x4 + amd756_ioport)
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#define SMB_HOST_DATA (0x6 + amd756_ioport)
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#define SMB_HOST_COMMAND (0x8 + amd756_ioport)
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#define SMB_HOST_BLOCK_DATA (0x9 + amd756_ioport)
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#define SMB_HAS_DATA (0xA + amd756_ioport)
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#define SMB_HAS_DEVICE_ADDRESS (0xC + amd756_ioport)
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#define SMB_HAS_HOST_ADDRESS (0xE + amd756_ioport)
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#define SMB_SNOOP_ADDRESS (0xF + amd756_ioport)
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/* PCI Address Constants */
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/* address of I/O space */
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#define SMBBA 0x058 /* mh */
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#define SMBBANFORCE 0x014
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/* general configuration */
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#define SMBGCFG 0x041 /* mh */
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/* silicon revision code */
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#define SMBREV 0x008
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/* Other settings */
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#define MAX_TIMEOUT 500
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/* AMD756 constants */
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#define AMD756_QUICK 0x00
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#define AMD756_BYTE 0x01
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#define AMD756_BYTE_DATA 0x02
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#define AMD756_WORD_DATA 0x03
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#define AMD756_PROCESS_CALL 0x04
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#define AMD756_BLOCK_DATA 0x05
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static struct pci_driver amd756_driver;
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static unsigned short amd756_ioport;
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/*
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SMBUS event = I/O 28-29 bit 11
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see E0 for the status bits and enabled in E2
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*/
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#define GS_ABRT_STS (1 << 0)
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#define GS_COL_STS (1 << 1)
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#define GS_PRERR_STS (1 << 2)
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#define GS_HST_STS (1 << 3)
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#define GS_HCYC_STS (1 << 4)
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#define GS_TO_STS (1 << 5)
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#define GS_SMB_STS (1 << 11)
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#define GS_CLEAR_STS (GS_ABRT_STS | GS_COL_STS | GS_PRERR_STS | \
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GS_HCYC_STS | GS_TO_STS )
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#define GE_CYC_TYPE_MASK (7)
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#define GE_HOST_STC (1 << 3)
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#define GE_ABORT (1 << 5)
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static int amd756_transaction(struct i2c_adapter *adap)
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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(&adap->dev, "Transaction (pre): GS=%04x, GE=%04x, ADD=%04x, "
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"DAT=%04x\n", inw_p(SMB_GLOBAL_STATUS),
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inw_p(SMB_GLOBAL_ENABLE), inw_p(SMB_HOST_ADDRESS),
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inb_p(SMB_HOST_DATA));
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/* Make sure the SMBus host is ready to start transmitting */
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if ((temp = inw_p(SMB_GLOBAL_STATUS)) & (GS_HST_STS | GS_SMB_STS)) {
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dev_dbg(&adap->dev, "SMBus busy (%04x). Waiting...\n", temp);
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do {
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msleep(1);
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temp = inw_p(SMB_GLOBAL_STATUS);
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} while ((temp & (GS_HST_STS | GS_SMB_STS)) &&
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(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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dev_dbg(&adap->dev, "Busy wait timeout (%04x)\n", temp);
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goto abort;
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}
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timeout = 0;
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}
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/* start the transaction by setting the start bit */
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outw_p(inw(SMB_GLOBAL_ENABLE) | GE_HOST_STC, SMB_GLOBAL_ENABLE);
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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 = inw_p(SMB_GLOBAL_STATUS);
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} while ((temp & GS_HST_STS) && (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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dev_dbg(&adap->dev, "Completion timeout!\n");
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goto abort;
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}
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if (temp & GS_PRERR_STS) {
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result = -ENXIO;
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dev_dbg(&adap->dev, "SMBus Protocol error (no response)!\n");
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}
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if (temp & GS_COL_STS) {
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result = -EIO;
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dev_warn(&adap->dev, "SMBus collision!\n");
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}
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if (temp & GS_TO_STS) {
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result = -ETIMEDOUT;
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dev_dbg(&adap->dev, "SMBus protocol timeout!\n");
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}
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if (temp & GS_HCYC_STS)
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dev_dbg(&adap->dev, "SMBus protocol success!\n");
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outw_p(GS_CLEAR_STS, SMB_GLOBAL_STATUS);
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#ifdef DEBUG
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if (((temp = inw_p(SMB_GLOBAL_STATUS)) & GS_CLEAR_STS) != 0x00) {
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dev_dbg(&adap->dev,
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"Failed reset at end of transaction (%04x)\n", temp);
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}
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#endif
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dev_dbg(&adap->dev,
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"Transaction (post): GS=%04x, GE=%04x, ADD=%04x, DAT=%04x\n",
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inw_p(SMB_GLOBAL_STATUS), inw_p(SMB_GLOBAL_ENABLE),
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inw_p(SMB_HOST_ADDRESS), inb_p(SMB_HOST_DATA));
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return result;
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abort:
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dev_warn(&adap->dev, "Sending abort\n");
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outw_p(inw(SMB_GLOBAL_ENABLE) | GE_ABORT, SMB_GLOBAL_ENABLE);
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msleep(100);
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outw_p(GS_CLEAR_STS, SMB_GLOBAL_STATUS);
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return -EIO;
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}
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/* Return negative errno on error. */
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static s32 amd756_access(struct i2c_adapter * adap, u16 addr,
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unsigned short flags, char read_write,
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u8 command, int size, union i2c_smbus_data * data)
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{
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int i, len;
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int status;
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switch (size) {
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case I2C_SMBUS_QUICK:
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outw_p(((addr & 0x7f) << 1) | (read_write & 0x01),
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SMB_HOST_ADDRESS);
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size = AMD756_QUICK;
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break;
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case I2C_SMBUS_BYTE:
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outw_p(((addr & 0x7f) << 1) | (read_write & 0x01),
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SMB_HOST_ADDRESS);
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if (read_write == I2C_SMBUS_WRITE)
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outb_p(command, SMB_HOST_DATA);
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size = AMD756_BYTE;
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break;
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case I2C_SMBUS_BYTE_DATA:
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outw_p(((addr & 0x7f) << 1) | (read_write & 0x01),
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SMB_HOST_ADDRESS);
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outb_p(command, SMB_HOST_COMMAND);
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if (read_write == I2C_SMBUS_WRITE)
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outw_p(data->byte, SMB_HOST_DATA);
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size = AMD756_BYTE_DATA;
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break;
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case I2C_SMBUS_WORD_DATA:
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outw_p(((addr & 0x7f) << 1) | (read_write & 0x01),
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SMB_HOST_ADDRESS);
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outb_p(command, SMB_HOST_COMMAND);
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if (read_write == I2C_SMBUS_WRITE)
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outw_p(data->word, SMB_HOST_DATA); /* TODO: endian???? */
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size = AMD756_WORD_DATA;
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break;
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case I2C_SMBUS_BLOCK_DATA:
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outw_p(((addr & 0x7f) << 1) | (read_write & 0x01),
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SMB_HOST_ADDRESS);
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outb_p(command, SMB_HOST_COMMAND);
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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 > 32)
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len = 32;
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outw_p(len, SMB_HOST_DATA);
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/* i = inw_p(SMBHSTCNT); Reset SMBBLKDAT */
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for (i = 1; i <= len; i++)
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outb_p(data->block[i],
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SMB_HOST_BLOCK_DATA);
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}
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size = AMD756_BLOCK_DATA;
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break;
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default:
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dev_warn(&adap->dev, "Unsupported transaction %d\n", size);
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return -EOPNOTSUPP;
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}
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/* How about enabling interrupts... */
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outw_p(size & GE_CYC_TYPE_MASK, SMB_GLOBAL_ENABLE);
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status = amd756_transaction(adap);
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if (status)
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return status;
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if ((read_write == I2C_SMBUS_WRITE) || (size == AMD756_QUICK))
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return 0;
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switch (size) {
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case AMD756_BYTE:
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data->byte = inw_p(SMB_HOST_DATA);
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break;
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case AMD756_BYTE_DATA:
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data->byte = inw_p(SMB_HOST_DATA);
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break;
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case AMD756_WORD_DATA:
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data->word = inw_p(SMB_HOST_DATA); /* TODO: endian???? */
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break;
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case AMD756_BLOCK_DATA:
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data->block[0] = inw_p(SMB_HOST_DATA) & 0x3f;
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if(data->block[0] > 32)
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data->block[0] = 32;
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/* i = inw_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(SMB_HOST_BLOCK_DATA);
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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 amd756_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 const struct i2c_algorithm smbus_algorithm = {
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.smbus_xfer = amd756_access,
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.functionality = amd756_func,
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};
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struct i2c_adapter amd756_smbus = {
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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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enum chiptype { AMD756, AMD766, AMD768, NFORCE, AMD8111 };
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static const char* chipname[] = {
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"AMD756", "AMD766", "AMD768",
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"nVidia nForce", "AMD8111",
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};
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static const struct pci_device_id amd756_ids[] = {
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{ PCI_DEVICE(PCI_VENDOR_ID_AMD, PCI_DEVICE_ID_AMD_VIPER_740B),
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.driver_data = AMD756 },
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{ PCI_DEVICE(PCI_VENDOR_ID_AMD, PCI_DEVICE_ID_AMD_VIPER_7413),
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.driver_data = AMD766 },
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{ PCI_DEVICE(PCI_VENDOR_ID_AMD, PCI_DEVICE_ID_AMD_OPUS_7443),
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.driver_data = AMD768 },
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{ PCI_DEVICE(PCI_VENDOR_ID_AMD, PCI_DEVICE_ID_AMD_8111_SMBUS),
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.driver_data = AMD8111 },
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{ PCI_DEVICE(PCI_VENDOR_ID_NVIDIA, PCI_DEVICE_ID_NVIDIA_NFORCE_SMBUS),
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.driver_data = NFORCE },
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{ 0, }
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};
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MODULE_DEVICE_TABLE (pci, amd756_ids);
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static int amd756_probe(struct pci_dev *pdev, const struct pci_device_id *id)
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{
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int nforce = (id->driver_data == NFORCE);
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int error;
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u8 temp;
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if (amd756_ioport) {
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dev_err(&pdev->dev, "Only one device supported "
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"(you have a strange motherboard, btw)\n");
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return -ENODEV;
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}
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if (nforce) {
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if (PCI_FUNC(pdev->devfn) != 1)
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return -ENODEV;
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pci_read_config_word(pdev, SMBBANFORCE, &amd756_ioport);
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amd756_ioport &= 0xfffc;
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} else { /* amd */
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if (PCI_FUNC(pdev->devfn) != 3)
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return -ENODEV;
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pci_read_config_byte(pdev, SMBGCFG, &temp);
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if ((temp & 128) == 0) {
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dev_err(&pdev->dev,
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"Error: SMBus controller I/O not enabled!\n");
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return -ENODEV;
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}
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/* Determine the address of the SMBus areas */
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/* Technically it is a dword but... */
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pci_read_config_word(pdev, SMBBA, &amd756_ioport);
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amd756_ioport &= 0xff00;
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amd756_ioport += SMB_ADDR_OFFSET;
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}
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error = acpi_check_region(amd756_ioport, SMB_IOSIZE,
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amd756_driver.name);
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if (error)
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return -ENODEV;
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if (!request_region(amd756_ioport, SMB_IOSIZE, amd756_driver.name)) {
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dev_err(&pdev->dev, "SMB region 0x%x already in use!\n",
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amd756_ioport);
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return -ENODEV;
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}
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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, "AMD756_smba = 0x%X\n", amd756_ioport);
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/* set up the sysfs linkage to our parent device */
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amd756_smbus.dev.parent = &pdev->dev;
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snprintf(amd756_smbus.name, sizeof(amd756_smbus.name),
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"SMBus %s adapter at %04x", chipname[id->driver_data],
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amd756_ioport);
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error = i2c_add_adapter(&amd756_smbus);
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if (error) {
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dev_err(&pdev->dev,
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"Adapter registration failed, module not inserted\n");
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goto out_err;
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}
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return 0;
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out_err:
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release_region(amd756_ioport, SMB_IOSIZE);
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return error;
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}
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static void amd756_remove(struct pci_dev *dev)
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{
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i2c_del_adapter(&amd756_smbus);
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release_region(amd756_ioport, SMB_IOSIZE);
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}
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static struct pci_driver amd756_driver = {
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.name = "amd756_smbus",
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.id_table = amd756_ids,
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.probe = amd756_probe,
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.remove = amd756_remove,
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};
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module_pci_driver(amd756_driver);
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MODULE_AUTHOR("Merlin Hughes <merlin@merlin.org>");
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MODULE_DESCRIPTION("AMD756/766/768/8111 and nVidia nForce SMBus driver");
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MODULE_LICENSE("GPL");
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EXPORT_SYMBOL(amd756_smbus);
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