i2c-i801.c

i2c 在linux下的驱动设计

/*
    i2c-i801.c - Part of lm_sensors, Linux kernel modules for hardware
              monitoring
    Copyright (c) 1998 - 2002  Frodo Looijaard <[e-mail]>,
    Philip Edelbrock <[e-mail]>, and Mark D. Studebaker
    <[e-mail]>

    This program is free software; you can redistribute it and/or modify
    it under the terms of the GNU General Public License as published by
    the Free Software Foundation; either version 2 of the License, or
    (at your option) any later version.

    This program is distributed in the hope that it will be useful,
    but WITHOUT ANY WARRANTY; without even the implied warranty of
    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
    GNU General Public License for more details.

    You should have received a copy of the GNU General Public License
    along with this program; if not, write to the Free Software
    Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
*/

/*
    SUPPORTED DEVICES	PCI ID
    82801AA		2413           
    82801AB		2423           
    82801BA		2443           
    82801CA/CAM		2483           
    82801DB		24C3   (HW PEC supported, 32 byte buffer not supported)
    82801EB		24D3   (HW PEC supported, 32 byte buffer not supported)
    6300ESB		25A4
    ICH6		266A
    ICH7		27DA
    ESB2		269B
    ICH8		283E
    ICH9		2930
    This driver supports several versions of Intel's I/O Controller Hubs (ICH).
    For SMBus support, they are similar to the PIIX4 and are part
    of Intel's '810' and other chipsets.
    See the file Documentation/i2c/busses/i2c-i801 for details.
    I2C Block Read and Process Call are not supported.
*/

/* Note: we assume there can only be one I801, with one SMBus interface */

#include <linux/module.h>
#include <linux/pci.h>
#include <linux/kernel.h>
#include <linux/stddef.h>
#include <linux/delay.h>
#include <linux/ioport.h>
#include <linux/init.h>
#include <linux/i2c.h>
#include <asm/io.h>

/* I801 SMBus address offsets */
#define SMBHSTSTS	(0 + i801_smba)
#define SMBHSTCNT	(2 + i801_smba)
#define SMBHSTCMD	(3 + i801_smba)
#define SMBHSTADD	(4 + i801_smba)
#define SMBHSTDAT0	(5 + i801_smba)
#define SMBHSTDAT1	(6 + i801_smba)
#define SMBBLKDAT	(7 + i801_smba)
#define SMBPEC		(8 + i801_smba)	/* ICH4 only */
#define SMBAUXSTS	(12 + i801_smba)	/* ICH4 only */
#define SMBAUXCTL	(13 + i801_smba)	/* ICH4 only */

/* PCI Address Constants */
#define SMBBAR		4
#define SMBHSTCFG	0x040

/* Host configuration bits for SMBHSTCFG */
#define SMBHSTCFG_HST_EN	1
#define SMBHSTCFG_SMB_SMI_EN	2
#define SMBHSTCFG_I2C_EN	4

/* Other settings */
#define MAX_TIMEOUT		100
#define ENABLE_INT9		0	/* set to 0x01 to enable - untested */

/* I801 command constants */
#define I801_QUICK		0x00
#define I801_BYTE		0x04
#define I801_BYTE_DATA		0x08
#define I801_WORD_DATA		0x0C
#define I801_PROC_CALL		0x10	/* later chips only, unimplemented */
#define I801_BLOCK_DATA		0x14
#define I801_I2C_BLOCK_DATA	0x18	/* unimplemented */
#define I801_BLOCK_LAST		0x34
#define I801_I2C_BLOCK_LAST	0x38	/* unimplemented */
#define I801_START		0x40
#define I801_PEC_EN		0x80	/* ICH4 only */


static int i801_transaction(void);
static int i801_block_transaction(union i2c_smbus_data *data, char read_write,
				  int command, int hwpec);

static unsigned long i801_smba;
static unsigned char i801_original_hstcfg;
static struct pci_driver i801_driver;
static struct pci_dev *I801_dev;
static int isich4;

static int i801_transaction(void)
{
	int temp;
	int result = 0;
	int timeout = 0;

	dev_dbg(&I801_dev->dev, "Transaction (pre): CNT=%02x, CMD=%02x, "
		"ADD=%02x, DAT0=%02x, DAT1=%02x\n", inb_p(SMBHSTCNT),
		inb_p(SMBHSTCMD), inb_p(SMBHSTADD), inb_p(SMBHSTDAT0),
		inb_p(SMBHSTDAT1));

	/* Make sure the SMBus host is ready to start transmitting */
	/* 0x1f = Failed, Bus_Err, Dev_Err, Intr, Host_Busy */
	if ((temp = (0x1f & inb_p(SMBHSTSTS))) != 0x00) {
		dev_dbg(&I801_dev->dev, "SMBus busy (%02x). Resetting...\n",
			temp);
		outb_p(temp, SMBHSTSTS);
		if ((temp = (0x1f & inb_p(SMBHSTSTS))) != 0x00) {
			dev_dbg(&I801_dev->dev, "Failed! (%02x)\n", temp);
			return -1;
		} else {
			dev_dbg(&I801_dev->dev, "Successful!\n");
		}
	}

	outb_p(inb(SMBHSTCNT) | I801_START, SMBHSTCNT);

	/* We will always wait for a fraction of a second! */
	do {
		msleep(1);
		temp = inb_p(SMBHSTSTS);
	} while ((temp & 0x01) && (timeout++ < MAX_TIMEOUT));

	/* If the SMBus is still busy, we give up */
	if (timeout >= MAX_TIMEOUT) {
		dev_dbg(&I801_dev->dev, "SMBus Timeout!\n");
		result = -1;
	}

	if (temp & 0x10) {
		result = -1;
		dev_dbg(&I801_dev->dev, "Error: Failed bus transaction\n");
	}

	if (temp & 0x08) {
		result = -1;
		dev_err(&I801_dev->dev, "Bus collision! SMBus may be locked "
			"until next hard reset. (sorry!)\n");
		/* Clock stops and slave is stuck in mid-transmission */
	}

	if (temp & 0x04) {
		result = -1;
		dev_dbg(&I801_dev->dev, "Error: no response!\n");
	}

	if ((inb_p(SMBHSTSTS) & 0x1f) != 0x00)
		outb_p(inb(SMBHSTSTS), SMBHSTSTS);

	if ((temp = (0x1f & inb_p(SMBHSTSTS))) != 0x00) {
		dev_dbg(&I801_dev->dev, "Failed reset at end of transaction "
			"(%02x)\n", temp);
	}
	dev_dbg(&I801_dev->dev, "Transaction (post): CNT=%02x, CMD=%02x, "
		"ADD=%02x, DAT0=%02x, DAT1=%02x\n", inb_p(SMBHSTCNT),
		inb_p(SMBHSTCMD), inb_p(SMBHSTADD), inb_p(SMBHSTDAT0),
		inb_p(SMBHSTDAT1));
	return result;
}

/* All-inclusive block transaction function */
static int i801_block_transaction(union i2c_smbus_data *data, char read_write,
				  int command, int hwpec)
{
	int i, len;
	int smbcmd;
	int temp;
	int result = 0;
	int timeout;
	unsigned char hostc, errmask;

	if (command == I2C_SMBUS_I2C_BLOCK_DATA) {
		if (read_write == I2C_SMBUS_WRITE) {
			/* set I2C_EN bit in configuration register */
			pci_read_config_byte(I801_dev, SMBHSTCFG, &hostc);
			pci_write_config_byte(I801_dev, SMBHSTCFG,
					      hostc | SMBHSTCFG_I2C_EN);
		} else {
			dev_err(&I801_dev->dev,
				"I2C_SMBUS_I2C_BLOCK_READ not DB!\n");
			return -1;
		}
	}

	if (read_write == I2C_SMBUS_WRITE) {
		len = data->block[0];
		if (len < 1)
			len = 1;
		if (len > 32)
			len = 32;
		outb_p(len, SMBHSTDAT0);
		outb_p(data->block[1], SMBBLKDAT);
	} else {
		len = 32;	/* max for reads */
	}

	if(isich4 && command != I2C_SMBUS_I2C_BLOCK_DATA) {
		/* set 32 byte buffer */
	}

	for (i = 1; i <= len; i++) {
		if (i == len && read_write == I2C_SMBUS_READ)
			smbcmd = I801_BLOCK_LAST;
		else
			smbcmd = I801_BLOCK_DATA;
		outb_p(smbcmd | ENABLE_INT9, SMBHSTCNT);

		dev_dbg(&I801_dev->dev, "Block (pre %d): CNT=%02x, CMD=%02x, "
			"ADD=%02x, DAT0=%02x, BLKDAT=%02x\n", i,
			inb_p(SMBHSTCNT), inb_p(SMBHSTCMD), inb_p(SMBHSTADD),
			inb_p(SMBHSTDAT0), inb_p(SMBBLKDAT));

		/* Make sure the SMBus host is ready to start transmitting */
		temp = inb_p(SMBHSTSTS);
		if (i == 1) {
			/* Erronenous conditions before transaction: 
			 * Byte_Done, Failed, Bus_Err, Dev_Err, Intr, Host_Busy */
			errmask=0x9f; 
		} else {
			/* Erronenous conditions during transaction: 
			 * Failed, Bus_Err, Dev_Err, Intr */
			errmask=0x1e; 
		}
		if (temp & errmask) {
			dev_dbg(&I801_dev->dev, "SMBus busy (%02x). "
				"Resetting...\n", temp);
			outb_p(temp, SMBHSTSTS);
			if (((temp = inb_p(SMBHSTSTS)) & errmask) != 0x00) {
				dev_err(&I801_dev->dev,
					"Reset failed! (%02x)\n", temp);
				result = -1;
                                goto END;
			}
			if (i != 1) {
				/* if die in middle of block transaction, fail */
				result = -1;
				goto END;
			}
		}

		if (i == 1)
			outb_p(inb(SMBHSTCNT) | I801_START, SMBHSTCNT);

		/* We will always wait for a fraction of a second! */
		timeout = 0;
		do {
			msleep(1);
			temp = inb_p(SMBHSTSTS);
		}
		    while ((!(temp & 0x80))
			   && (timeout++ < MAX_TIMEOUT));

		/* If the SMBus is still busy, we give up */
		if (timeout >= MAX_TIMEOUT) {
			result = -1;
			dev_dbg(&I801_dev->dev, "SMBus Timeout!\n");
		}

		if (temp & 0x10) {
			result = -1;
			dev_dbg(&I801_dev->dev,
				"Error: Failed bus transaction\n");
		} else if (temp & 0x08) {
			result = -1;
			dev_err(&I801_dev->dev, "Bus collision!\n");
		} else if (temp & 0x04) {
			result = -1;
			dev_dbg(&I801_dev->dev, "Error: no response!\n");
		}

		if (i == 1 && read_write == I2C_SMBUS_READ) {
			len = inb_p(SMBHSTDAT0);
			if (len < 1)
				len = 1;
			if (len > 32)
				len = 32;
			data->block[0] = len;
		}

		/* Retrieve/store value in SMBBLKDAT */
		if (read_write == I2C_SMBUS_READ)
			data->block[i] = inb_p(SMBBLKDAT);
		if (read_write == I2C_SMBUS_WRITE && i+1 <= len)
			outb_p(data->block[i+1], SMBBLKDAT);
		if ((temp & 0x9e) != 0x00)
			outb_p(temp, SMBHSTSTS);  /* signals SMBBLKDAT ready */

		if ((temp = (0x1e & inb_p(SMBHSTSTS))) != 0x00) {