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543 lines
16 KiB
543 lines
16 KiB
/*
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i2c-ali1535.c - Part of lm_sensors, Linux kernel modules for hardware
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monitoring
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Copyright (c) 2000 Frodo Looijaard <frodol@dds.nl>,
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Philip Edelbrock <phil@netroedge.com>,
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Mark D. Studebaker <mdsxyz123@yahoo.com>,
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Dan Eaton <dan.eaton@rocketlogix.com> and
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Stephen Rousset<stephen.rousset@rocketlogix.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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This is the driver for the SMB Host controller on
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Acer Labs Inc. (ALI) M1535 South Bridge.
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The M1535 is a South bridge for portable systems.
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It is very similar to the M15x3 South bridges also produced
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by Acer Labs Inc. Some of the registers within the part
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have moved and some have been redefined slightly. Additionally,
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the sequencing of the SMBus transactions has been modified
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to be more consistent with the sequencing recommended by
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the manufacturer and observed through testing. These
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changes are reflected in this driver and can be identified
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by comparing this driver to the i2c-ali15x3 driver.
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For an overview of these chips see http://www.acerlabs.com
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The SMB controller is part of the 7101 device, which is an
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ACPI-compliant Power Management Unit (PMU).
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The whole 7101 device has to be enabled for the SMB to work.
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You can't just enable the SMB alone.
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The SMB and the ACPI have separate I/O spaces.
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We make sure that the SMB is enabled. We leave the ACPI alone.
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This driver controls the SMB Host only.
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This driver does not use interrupts.
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*/
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/* Note: we assume there can only be one ALI1535, with one SMBus interface */
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#include <linux/config.h>
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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/stddef.h>
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#include <linux/sched.h>
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#include <linux/delay.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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#include <asm/semaphore.h>
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/* ALI1535 SMBus address offsets */
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#define SMBHSTSTS (0 + ali1535_smba)
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#define SMBHSTTYP (1 + ali1535_smba)
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#define SMBHSTPORT (2 + ali1535_smba)
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#define SMBHSTCMD (7 + ali1535_smba)
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#define SMBHSTADD (3 + ali1535_smba)
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#define SMBHSTDAT0 (4 + ali1535_smba)
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#define SMBHSTDAT1 (5 + ali1535_smba)
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#define SMBBLKDAT (6 + ali1535_smba)
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/* PCI Address Constants */
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#define SMBCOM 0x004
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#define SMBREV 0x008
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#define SMBCFG 0x0D1
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#define SMBBA 0x0E2
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#define SMBHSTCFG 0x0F0
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#define SMBCLK 0x0F2
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/* Other settings */
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#define MAX_TIMEOUT 500 /* times 1/100 sec */
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#define ALI1535_SMB_IOSIZE 32
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#define ALI1535_SMB_DEFAULTBASE 0x8040
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/* ALI1535 address lock bits */
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#define ALI1535_LOCK 0x06 /* dwe */
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/* ALI1535 command constants */
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#define ALI1535_QUICK 0x00
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#define ALI1535_BYTE 0x10
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#define ALI1535_BYTE_DATA 0x20
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#define ALI1535_WORD_DATA 0x30
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#define ALI1535_BLOCK_DATA 0x40
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#define ALI1535_I2C_READ 0x60
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#define ALI1535_DEV10B_EN 0x80 /* Enable 10-bit addressing in */
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/* I2C read */
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#define ALI1535_T_OUT 0x08 /* Time-out Command (write) */
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#define ALI1535_A_HIGH_BIT9 0x08 /* Bit 9 of 10-bit address in */
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/* Alert-Response-Address */
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/* (read) */
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#define ALI1535_KILL 0x04 /* Kill Command (write) */
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#define ALI1535_A_HIGH_BIT8 0x04 /* Bit 8 of 10-bit address in */
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/* Alert-Response-Address */
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/* (read) */
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#define ALI1535_D_HI_MASK 0x03 /* Mask for isolating bits 9-8 */
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/* of 10-bit address in I2C */
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/* Read Command */
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/* ALI1535 status register bits */
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#define ALI1535_STS_IDLE 0x04
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#define ALI1535_STS_BUSY 0x08 /* host busy */
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#define ALI1535_STS_DONE 0x10 /* transaction complete */
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#define ALI1535_STS_DEV 0x20 /* device error */
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#define ALI1535_STS_BUSERR 0x40 /* bus error */
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#define ALI1535_STS_FAIL 0x80 /* failed bus transaction */
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#define ALI1535_STS_ERR 0xE0 /* all the bad error bits */
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#define ALI1535_BLOCK_CLR 0x04 /* reset block data index */
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/* ALI1535 device address register bits */
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#define ALI1535_RD_ADDR 0x01 /* Read/Write Bit in Device */
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/* Address field */
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/* -> Write = 0 */
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/* -> Read = 1 */
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#define ALI1535_SMBIO_EN 0x04 /* SMB I/O Space enable */
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static unsigned short ali1535_smba;
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static DECLARE_MUTEX(i2c_ali1535_sem);
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/* Detect whether a ALI1535 can be found, and initialize it, where necessary.
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Note the differences between kernels with the old PCI BIOS interface and
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newer kernels with the real PCI interface. In compat.h some things are
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defined to make the transition easier. */
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static int ali1535_setup(struct pci_dev *dev)
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{
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int retval = -ENODEV;
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unsigned char temp;
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/* Check the following things:
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- SMB I/O address is initialized
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- Device is enabled
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- We can use the addresses
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*/
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/* Determine the address of the SMBus area */
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pci_read_config_word(dev, SMBBA, &ali1535_smba);
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ali1535_smba &= (0xffff & ~(ALI1535_SMB_IOSIZE - 1));
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if (ali1535_smba == 0) {
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dev_warn(&dev->dev,
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"ALI1535_smb region uninitialized - upgrade BIOS?\n");
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goto exit;
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}
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if (!request_region(ali1535_smba, ALI1535_SMB_IOSIZE, "ali1535-smb")) {
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dev_err(&dev->dev, "ALI1535_smb region 0x%x already in use!\n",
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ali1535_smba);
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goto exit;
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}
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/* check if whole device is enabled */
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pci_read_config_byte(dev, SMBCFG, &temp);
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if ((temp & ALI1535_SMBIO_EN) == 0) {
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dev_err(&dev->dev, "SMB device not enabled - upgrade BIOS?\n");
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goto exit_free;
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}
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/* Is SMB Host controller enabled? */
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pci_read_config_byte(dev, SMBHSTCFG, &temp);
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if ((temp & 1) == 0) {
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dev_err(&dev->dev, "SMBus controller not enabled - upgrade BIOS?\n");
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goto exit_free;
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}
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/* set SMB clock to 74KHz as recommended in data sheet */
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pci_write_config_byte(dev, SMBCLK, 0x20);
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/*
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The interrupt routing for SMB is set up in register 0x77 in the
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1533 ISA Bridge device, NOT in the 7101 device.
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Don't bother with finding the 1533 device and reading the register.
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if ((....... & 0x0F) == 1)
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dev_dbg(&dev->dev, "ALI1535 using Interrupt 9 for SMBus.\n");
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*/
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pci_read_config_byte(dev, SMBREV, &temp);
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dev_dbg(&dev->dev, "SMBREV = 0x%X\n", temp);
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dev_dbg(&dev->dev, "ALI1535_smba = 0x%X\n", ali1535_smba);
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retval = 0;
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exit:
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return retval;
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exit_free:
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release_region(ali1535_smba, ALI1535_SMB_IOSIZE);
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return retval;
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}
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static int ali1535_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): STS=%02x, TYP=%02x, "
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"CMD=%02x, ADD=%02x, DAT0=%02x, DAT1=%02x\n",
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inb_p(SMBHSTSTS), inb_p(SMBHSTTYP), inb_p(SMBHSTCMD),
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inb_p(SMBHSTADD), inb_p(SMBHSTDAT0), inb_p(SMBHSTDAT1));
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/* get status */
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temp = inb_p(SMBHSTSTS);
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/* Make sure the SMBus host is ready to start transmitting */
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/* Check the busy bit first */
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if (temp & ALI1535_STS_BUSY) {
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/* If the host controller is still busy, it may have timed out
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* in the previous transaction, resulting in a "SMBus Timeout"
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* printk. I've tried the following to reset a stuck busy bit.
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* 1. Reset the controller with an KILL command. (this
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* doesn't seem to clear the controller if an external
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* device is hung)
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* 2. Reset the controller and the other SMBus devices with a
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* T_OUT command. (this clears the host busy bit if an
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* external device is hung, but it comes back upon a new
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* access to a device)
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* 3. Disable and reenable the controller in SMBHSTCFG. Worst
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* case, nothing seems to work except power reset.
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*/
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/* Try resetting entire SMB bus, including other devices - This
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* may not work either - it clears the BUSY bit but then the
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* BUSY bit may come back on when you try and use the chip
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* again. If that's the case you are stuck.
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*/
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dev_info(&adap->dev,
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"Resetting entire SMB Bus to clear busy condition (%02x)\n",
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temp);
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outb_p(ALI1535_T_OUT, SMBHSTTYP);
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temp = inb_p(SMBHSTSTS);
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}
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/* now check the error bits and the busy bit */
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if (temp & (ALI1535_STS_ERR | ALI1535_STS_BUSY)) {
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/* do a clear-on-write */
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outb_p(0xFF, SMBHSTSTS);
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if ((temp = inb_p(SMBHSTSTS)) &
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(ALI1535_STS_ERR | ALI1535_STS_BUSY)) {
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/* This is probably going to be correctable only by a
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* power reset as one of the bits now appears to be
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* stuck */
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/* This may be a bus or device with electrical problems. */
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dev_err(&adap->dev,
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"SMBus reset failed! (0x%02x) - controller or "
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"device on bus is probably hung\n", temp);
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return -1;
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}
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} else {
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/* check and clear done bit */
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if (temp & ALI1535_STS_DONE) {
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outb_p(temp, SMBHSTSTS);
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}
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}
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/* start the transaction by writing anything to the start register */
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outb_p(0xFF, SMBHSTPORT);
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/* We will always wait for a fraction of a second! */
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timeout = 0;
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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 & ALI1535_STS_BUSY) && !(temp & ALI1535_STS_IDLE))
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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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result = -1;
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dev_err(&adap->dev, "SMBus Timeout!\n");
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}
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if (temp & ALI1535_STS_FAIL) {
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result = -1;
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dev_dbg(&adap->dev, "Error: Failed bus transaction\n");
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}
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/* Unfortunately the ALI SMB controller maps "no response" and "bus
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* collision" into a single bit. No reponse is the usual case so don't
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* do a printk. This means that bus collisions go unreported.
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*/
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if (temp & ALI1535_STS_BUSERR) {
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result = -1;
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dev_dbg(&adap->dev,
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"Error: no response or bus collision ADD=%02x\n",
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inb_p(SMBHSTADD));
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}
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/* haven't ever seen this */
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if (temp & ALI1535_STS_DEV) {
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result = -1;
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dev_err(&adap->dev, "Error: device error\n");
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}
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/* check to see if the "command complete" indication is set */
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if (!(temp & ALI1535_STS_DONE)) {
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result = -1;
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dev_err(&adap->dev, "Error: command never completed\n");
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}
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dev_dbg(&adap->dev, "Transaction (post): STS=%02x, TYP=%02x, "
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"CMD=%02x, ADD=%02x, DAT0=%02x, DAT1=%02x\n",
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inb_p(SMBHSTSTS), inb_p(SMBHSTTYP), inb_p(SMBHSTCMD),
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inb_p(SMBHSTADD), inb_p(SMBHSTDAT0), inb_p(SMBHSTDAT1));
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/* take consequent actions for error conditions */
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if (!(temp & ALI1535_STS_DONE)) {
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/* issue "kill" to reset host controller */
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outb_p(ALI1535_KILL,SMBHSTTYP);
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outb_p(0xFF,SMBHSTSTS);
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} else if (temp & ALI1535_STS_ERR) {
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/* issue "timeout" to reset all devices on bus */
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outb_p(ALI1535_T_OUT,SMBHSTTYP);
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outb_p(0xFF,SMBHSTSTS);
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}
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return result;
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}
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/* Return -1 on error. */
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static s32 ali1535_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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int temp;
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int timeout;
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s32 result = 0;
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down(&i2c_ali1535_sem);
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/* make sure SMBus is idle */
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temp = inb_p(SMBHSTSTS);
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for (timeout = 0;
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(timeout < MAX_TIMEOUT) && !(temp & ALI1535_STS_IDLE);
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timeout++) {
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msleep(1);
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temp = inb_p(SMBHSTSTS);
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}
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if (timeout >= MAX_TIMEOUT)
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dev_warn(&adap->dev, "Idle wait Timeout! STS=0x%02x\n", temp);
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/* clear status register (clear-on-write) */
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outb_p(0xFF, SMBHSTSTS);
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switch (size) {
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case I2C_SMBUS_PROC_CALL:
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dev_err(&adap->dev, "I2C_SMBUS_PROC_CALL not supported!\n");
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result = -1;
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goto EXIT;
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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 = ALI1535_QUICK;
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outb_p(size, SMBHSTTYP); /* output command */
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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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size = ALI1535_BYTE;
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outb_p(size, SMBHSTTYP); /* output command */
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if (read_write == I2C_SMBUS_WRITE)
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outb_p(command, SMBHSTCMD);
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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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size = ALI1535_BYTE_DATA;
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outb_p(size, SMBHSTTYP); /* output command */
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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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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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size = ALI1535_WORD_DATA;
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outb_p(size, SMBHSTTYP); /* output command */
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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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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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size = ALI1535_BLOCK_DATA;
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outb_p(size, SMBHSTTYP); /* output command */
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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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data->block[0] = len;
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}
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if (len > 32) {
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len = 32;
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data->block[0] = len;
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}
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outb_p(len, SMBHSTDAT0);
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/* Reset SMBBLKDAT */
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outb_p(inb_p(SMBHSTTYP) | ALI1535_BLOCK_CLR, SMBHSTTYP);
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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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break;
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}
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if (ali1535_transaction(adap)) {
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/* Error in transaction */
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result = -1;
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goto EXIT;
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}
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if ((read_write == I2C_SMBUS_WRITE) || (size == ALI1535_QUICK)) {
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result = 0;
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goto EXIT;
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}
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switch (size) {
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case ALI1535_BYTE: /* Result put in SMBHSTDAT0 */
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data->byte = inb_p(SMBHSTDAT0);
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break;
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case ALI1535_BYTE_DATA:
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data->byte = inb_p(SMBHSTDAT0);
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break;
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case ALI1535_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 ALI1535_BLOCK_DATA:
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len = inb_p(SMBHSTDAT0);
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if (len > 32)
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len = 32;
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data->block[0] = len;
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/* Reset SMBBLKDAT */
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outb_p(inb_p(SMBHSTTYP) | ALI1535_BLOCK_CLR, SMBHSTTYP);
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for (i = 1; i <= data->block[0]; i++) {
|
|
data->block[i] = inb_p(SMBBLKDAT);
|
|
dev_dbg(&adap->dev, "Blk: len=%d, i=%d, data=%02x\n",
|
|
len, i, data->block[i]);
|
|
}
|
|
break;
|
|
}
|
|
EXIT:
|
|
up(&i2c_ali1535_sem);
|
|
return result;
|
|
}
|
|
|
|
|
|
static u32 ali1535_func(struct i2c_adapter *adapter)
|
|
{
|
|
return I2C_FUNC_SMBUS_QUICK | I2C_FUNC_SMBUS_BYTE |
|
|
I2C_FUNC_SMBUS_BYTE_DATA | I2C_FUNC_SMBUS_WORD_DATA |
|
|
I2C_FUNC_SMBUS_BLOCK_DATA;
|
|
}
|
|
|
|
static struct i2c_algorithm smbus_algorithm = {
|
|
.name = "Non-i2c SMBus adapter",
|
|
.id = I2C_ALGO_SMBUS,
|
|
.smbus_xfer = ali1535_access,
|
|
.functionality = ali1535_func,
|
|
};
|
|
|
|
static struct i2c_adapter ali1535_adapter = {
|
|
.owner = THIS_MODULE,
|
|
.class = I2C_CLASS_HWMON,
|
|
.algo = &smbus_algorithm,
|
|
.name = "unset",
|
|
};
|
|
|
|
static struct pci_device_id ali1535_ids[] = {
|
|
{ PCI_DEVICE(PCI_VENDOR_ID_AL, PCI_DEVICE_ID_AL_M7101) },
|
|
{ },
|
|
};
|
|
|
|
MODULE_DEVICE_TABLE (pci, ali1535_ids);
|
|
|
|
static int __devinit ali1535_probe(struct pci_dev *dev, const struct pci_device_id *id)
|
|
{
|
|
if (ali1535_setup(dev)) {
|
|
dev_warn(&dev->dev,
|
|
"ALI1535 not detected, module not inserted.\n");
|
|
return -ENODEV;
|
|
}
|
|
|
|
/* set up the driverfs linkage to our parent device */
|
|
ali1535_adapter.dev.parent = &dev->dev;
|
|
|
|
snprintf(ali1535_adapter.name, I2C_NAME_SIZE,
|
|
"SMBus ALI1535 adapter at %04x", ali1535_smba);
|
|
return i2c_add_adapter(&ali1535_adapter);
|
|
}
|
|
|
|
static void __devexit ali1535_remove(struct pci_dev *dev)
|
|
{
|
|
i2c_del_adapter(&ali1535_adapter);
|
|
release_region(ali1535_smba, ALI1535_SMB_IOSIZE);
|
|
}
|
|
|
|
static struct pci_driver ali1535_driver = {
|
|
.name = "ali1535_smbus",
|
|
.id_table = ali1535_ids,
|
|
.probe = ali1535_probe,
|
|
.remove = __devexit_p(ali1535_remove),
|
|
};
|
|
|
|
static int __init i2c_ali1535_init(void)
|
|
{
|
|
return pci_register_driver(&ali1535_driver);
|
|
}
|
|
|
|
static void __exit i2c_ali1535_exit(void)
|
|
{
|
|
pci_unregister_driver(&ali1535_driver);
|
|
}
|
|
|
|
MODULE_AUTHOR("Frodo Looijaard <frodol@dds.nl>, "
|
|
"Philip Edelbrock <phil@netroedge.com>, "
|
|
"Mark D. Studebaker <mdsxyz123@yahoo.com> "
|
|
"and Dan Eaton <dan.eaton@rocketlogix.com>");
|
|
MODULE_DESCRIPTION("ALI1535 SMBus driver");
|
|
MODULE_LICENSE("GPL");
|
|
|
|
module_init(i2c_ali1535_init);
|
|
module_exit(i2c_ali1535_exit);
|
|
|