--- /dev/null
+/*
+ Copyright (c) 1999 Frodo Looijaard <frodol@dds.nl> and
+ Philip Edelbrock <phil@netroedge.com> and
+ Mark D. Studebaker <mdsxyz123@yahoo.com>
+
+ 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.
+*/
+
+/*
+ This is the driver for the SMB Host controller on
+ Acer Labs Inc. (ALI) M1541 and M1543C South Bridges.
+
+ The M1543C is a South bridge for desktop systems.
+ The M1533 is a South bridge for portable systems.
+ They are part of the following ALI chipsets:
+ "Aladdin Pro 2": Includes the M1621 Slot 1 North bridge
+ with AGP and 100MHz CPU Front Side bus
+ "Aladdin V": Includes the M1541 Socket 7 North bridge
+ with AGP and 100MHz CPU Front Side bus
+ "Aladdin IV": Includes the M1541 Socket 7 North bridge
+ with host bus up to 83.3 MHz.
+ For an overview of these chips see http://www.acerlabs.com
+
+ The M1533/M1543C devices appear as FOUR separate devices
+ on the PCI bus. An output of lspci will show something similar
+ to the following:
+
+ 00:02.0 USB Controller: Acer Laboratories Inc. M5237
+ 00:03.0 Bridge: Acer Laboratories Inc. M7101
+ 00:07.0 ISA bridge: Acer Laboratories Inc. M1533
+ 00:0f.0 IDE interface: Acer Laboratories Inc. M5229
+
+ The SMB controller is part of the 7101 device, which is an
+ ACPI-compliant Power Management Unit (PMU).
+
+ The whole 7101 device has to be enabled for the SMB to work.
+ You can't just enable the SMB alone.
+ The SMB and the ACPI have separate I/O spaces.
+ We make sure that the SMB is enabled. We leave the ACPI alone.
+
+ This driver controls the SMB Host only.
+ The SMB Slave controller on the M15X3 is not enabled.
+
+ This driver does not use interrupts.
+*/
+
+/* Note: we assume there can only be one ALI15X3, with one SMBus interface */
+
+#include <linux/module.h>
+#include <linux/pci.h>
+#include <linux/kernel.h>
+#include <linux/stddef.h>
+#include <linux/ioport.h>
+#include <linux/delay.h>
+#include <linux/i2c.h>
+#include <linux/acpi.h>
+#include <linux/io.h>
+
+/* ALI15X3 SMBus address offsets */
+#define SMBHSTSTS (0 + ali15x3_smba)
+#define SMBHSTCNT (1 + ali15x3_smba)
+#define SMBHSTSTART (2 + ali15x3_smba)
+#define SMBHSTCMD (7 + ali15x3_smba)
+#define SMBHSTADD (3 + ali15x3_smba)
+#define SMBHSTDAT0 (4 + ali15x3_smba)
+#define SMBHSTDAT1 (5 + ali15x3_smba)
+#define SMBBLKDAT (6 + ali15x3_smba)
+
+/* PCI Address Constants */
+#define SMBCOM 0x004
+#define SMBBA 0x014
+#define SMBATPC 0x05B /* used to unlock xxxBA registers */
+#define SMBHSTCFG 0x0E0
+#define SMBSLVC 0x0E1
+#define SMBCLK 0x0E2
+#define SMBREV 0x008
+
+/* Other settings */
+#define MAX_TIMEOUT 200 /* times 1/100 sec */
+#define ALI15X3_SMB_IOSIZE 32
+
+/* this is what the Award 1004 BIOS sets them to on a ASUS P5A MB.
+ We don't use these here. If the bases aren't set to some value we
+ tell user to upgrade BIOS and we fail.
+*/
+#define ALI15X3_SMB_DEFAULTBASE 0xE800
+
+/* ALI15X3 address lock bits */
+#define ALI15X3_LOCK 0x06
+
+/* ALI15X3 command constants */
+#define ALI15X3_ABORT 0x02
+#define ALI15X3_T_OUT 0x04
+#define ALI15X3_QUICK 0x00
+#define ALI15X3_BYTE 0x10
+#define ALI15X3_BYTE_DATA 0x20
+#define ALI15X3_WORD_DATA 0x30
+#define ALI15X3_BLOCK_DATA 0x40
+#define ALI15X3_BLOCK_CLR 0x80
+
+/* ALI15X3 status register bits */
+#define ALI15X3_STS_IDLE 0x04
+#define ALI15X3_STS_BUSY 0x08
+#define ALI15X3_STS_DONE 0x10
+#define ALI15X3_STS_DEV 0x20 /* device error */
+#define ALI15X3_STS_COLL 0x40 /* collision or no response */
+#define ALI15X3_STS_TERM 0x80 /* terminated by abort */
+#define ALI15X3_STS_ERR 0xE0 /* all the bad error bits */
+
+
+/* If force_addr is set to anything different from 0, we forcibly enable
+ the device at the given address. */
+static u16 force_addr;
+module_param(force_addr, ushort, 0);
+MODULE_PARM_DESC(force_addr,
+ "Initialize the base address of the i2c controller");
+
+static struct pci_driver ali15x3_driver;
+static unsigned short ali15x3_smba;
+
+static int ali15x3_setup(struct pci_dev *ALI15X3_dev)
+{
+ u16 a;
+ unsigned char temp;
+
+ /* Check the following things:
+ - SMB I/O address is initialized
+ - Device is enabled
+ - We can use the addresses
+ */
+
+ /* Unlock the register.
+ The data sheet says that the address registers are read-only
+ if the lock bits are 1, but in fact the address registers
+ are zero unless you clear the lock bits.
+ */
+ pci_read_config_byte(ALI15X3_dev, SMBATPC, &temp);
+ if (temp & ALI15X3_LOCK) {
+ temp &= ~ALI15X3_LOCK;
+ pci_write_config_byte(ALI15X3_dev, SMBATPC, temp);
+ }
+
+ /* Determine the address of the SMBus area */
+ pci_read_config_word(ALI15X3_dev, SMBBA, &ali15x3_smba);
+ ali15x3_smba &= (0xffff & ~(ALI15X3_SMB_IOSIZE - 1));
+ if (ali15x3_smba == 0 && force_addr == 0) {
+ dev_err(&ALI15X3_dev->dev, "ALI15X3_smb region uninitialized "
+ "- upgrade BIOS or use force_addr=0xaddr\n");
+ return -ENODEV;
+ }
+
+ if(force_addr)
+ ali15x3_smba = force_addr & ~(ALI15X3_SMB_IOSIZE - 1);
+
+ if (acpi_check_region(ali15x3_smba, ALI15X3_SMB_IOSIZE,
+ ali15x3_driver.name))
+ return -EBUSY;
+
+ if (!request_region(ali15x3_smba, ALI15X3_SMB_IOSIZE,
+ ali15x3_driver.name)) {
+ dev_err(&ALI15X3_dev->dev,
+ "ALI15X3_smb region 0x%x already in use!\n",
+ ali15x3_smba);
+ return -ENODEV;
+ }
+
+ if(force_addr) {
+ dev_info(&ALI15X3_dev->dev, "forcing ISA address 0x%04X\n",
+ ali15x3_smba);
+ if (PCIBIOS_SUCCESSFUL != pci_write_config_word(ALI15X3_dev,
+ SMBBA,
+ ali15x3_smba))
+ goto error;
+ if (PCIBIOS_SUCCESSFUL != pci_read_config_word(ALI15X3_dev,
+ SMBBA, &a))
+ goto error;
+ if ((a & ~(ALI15X3_SMB_IOSIZE - 1)) != ali15x3_smba) {
+ /* make sure it works */
+ dev_err(&ALI15X3_dev->dev,
+ "force address failed - not supported?\n");
+ goto error;
+ }
+ }
+ /* check if whole device is enabled */
+ pci_read_config_byte(ALI15X3_dev, SMBCOM, &temp);
+ if ((temp & 1) == 0) {
+ dev_info(&ALI15X3_dev->dev, "enabling SMBus device\n");
+ pci_write_config_byte(ALI15X3_dev, SMBCOM, temp | 0x01);
+ }
+
+ /* Is SMB Host controller enabled? */
+ pci_read_config_byte(ALI15X3_dev, SMBHSTCFG, &temp);
+ if ((temp & 1) == 0) {
+ dev_info(&ALI15X3_dev->dev, "enabling SMBus controller\n");
+ pci_write_config_byte(ALI15X3_dev, SMBHSTCFG, temp | 0x01);
+ }
+
+ /* set SMB clock to 74KHz as recommended in data sheet */
+ pci_write_config_byte(ALI15X3_dev, SMBCLK, 0x20);
+
+ /*
+ The interrupt routing for SMB is set up in register 0x77 in the
+ 1533 ISA Bridge device, NOT in the 7101 device.
+ Don't bother with finding the 1533 device and reading the register.
+ if ((....... & 0x0F) == 1)
+ dev_dbg(&ALI15X3_dev->dev, "ALI15X3 using Interrupt 9 for SMBus.\n");
+ */
+ pci_read_config_byte(ALI15X3_dev, SMBREV, &temp);
+ dev_dbg(&ALI15X3_dev->dev, "SMBREV = 0x%X\n", temp);
+ dev_dbg(&ALI15X3_dev->dev, "iALI15X3_smba = 0x%X\n", ali15x3_smba);
+
+ return 0;
+error:
+ release_region(ali15x3_smba, ALI15X3_SMB_IOSIZE);
+ return -ENODEV;
+}
+
+/* Another internally used function */
+static int ali15x3_transaction(struct i2c_adapter *adap)
+{
+ int temp;
+ int result = 0;
+ int timeout = 0;
+
+ dev_dbg(&adap->dev, "Transaction (pre): STS=%02x, CNT=%02x, CMD=%02x, "
+ "ADD=%02x, DAT0=%02x, DAT1=%02x\n", inb_p(SMBHSTSTS),
+ inb_p(SMBHSTCNT), inb_p(SMBHSTCMD), inb_p(SMBHSTADD),
+ inb_p(SMBHSTDAT0), inb_p(SMBHSTDAT1));
+
+ /* get status */
+ temp = inb_p(SMBHSTSTS);
+
+ /* Make sure the SMBus host is ready to start transmitting */
+ /* Check the busy bit first */
+ if (temp & ALI15X3_STS_BUSY) {
+ /*
+ If the host controller is still busy, it may have timed out in the
+ previous transaction, resulting in a "SMBus Timeout" Dev.
+ I've tried the following to reset a stuck busy bit.
+ 1. Reset the controller with an ABORT command.
+ (this doesn't seem to clear the controller if an external
+ device is hung)
+ 2. Reset the controller and the other SMBus devices with a
+ T_OUT command. (this clears the host busy bit if an
+ external device is hung, but it comes back upon a new access
+ to a device)
+ 3. Disable and reenable the controller in SMBHSTCFG
+ Worst case, nothing seems to work except power reset.
+ */
+ /* Abort - reset the host controller */
+ /*
+ Try resetting entire SMB bus, including other devices -
+ This may not work either - it clears the BUSY bit but
+ then the BUSY bit may come back on when you try and use the chip again.
+ If that's the case you are stuck.
+ */
+ dev_info(&adap->dev, "Resetting entire SMB Bus to "
+ "clear busy condition (%02x)\n", temp);
+ outb_p(ALI15X3_T_OUT, SMBHSTCNT);
+ temp = inb_p(SMBHSTSTS);
+ }
+
+ /* now check the error bits and the busy bit */
+ if (temp & (ALI15X3_STS_ERR | ALI15X3_STS_BUSY)) {
+ /* do a clear-on-write */
+ outb_p(0xFF, SMBHSTSTS);
+ if ((temp = inb_p(SMBHSTSTS)) &
+ (ALI15X3_STS_ERR | ALI15X3_STS_BUSY)) {
+ /* this is probably going to be correctable only by a power reset
+ as one of the bits now appears to be stuck */
+ /* This may be a bus or device with electrical problems. */
+ dev_err(&adap->dev, "SMBus reset failed! (0x%02x) - "
+ "controller or device on bus is probably hung\n",
+ temp);
+ return -EBUSY;
+ }
+ } else {
+ /* check and clear done bit */
+ if (temp & ALI15X3_STS_DONE) {
+ outb_p(temp, SMBHSTSTS);
+ }
+ }
+
+ /* start the transaction by writing anything to the start register */
+ outb_p(0xFF, SMBHSTSTART);
+
+ /* We will always wait for a fraction of a second! */
+ timeout = 0;
+ do {
+ msleep(1);
+ temp = inb_p(SMBHSTSTS);
+ } while ((!(temp & (ALI15X3_STS_ERR | ALI15X3_STS_DONE)))
+ && (timeout++ < MAX_TIMEOUT));
+
+ /* If the SMBus is still busy, we give up */
+ if (timeout > MAX_TIMEOUT) {
+ result = -ETIMEDOUT;
+ dev_err(&adap->dev, "SMBus Timeout!\n");
+ }
+
+ if (temp & ALI15X3_STS_TERM) {
+ result = -EIO;
+ dev_dbg(&adap->dev, "Error: Failed bus transaction\n");
+ }
+
+ /*
+ Unfortunately the ALI SMB controller maps "no response" and "bus
+ collision" into a single bit. No response is the usual case so don't
+ do a printk.
+ This means that bus collisions go unreported.
+ */
+ if (temp & ALI15X3_STS_COLL) {
+ result = -ENXIO;
+ dev_dbg(&adap->dev,
+ "Error: no response or bus collision ADD=%02x\n",
+ inb_p(SMBHSTADD));
+ }
+
+ /* haven't ever seen this */
+ if (temp & ALI15X3_STS_DEV) {
+ result = -EIO;
+ dev_err(&adap->dev, "Error: device error\n");
+ }
+ dev_dbg(&adap->dev, "Transaction (post): STS=%02x, CNT=%02x, CMD=%02x, "
+ "ADD=%02x, DAT0=%02x, DAT1=%02x\n", inb_p(SMBHSTSTS),
+ inb_p(SMBHSTCNT), inb_p(SMBHSTCMD), inb_p(SMBHSTADD),
+ inb_p(SMBHSTDAT0), inb_p(SMBHSTDAT1));
+ return result;
+}
+
+/* Return negative errno on error. */
+static s32 ali15x3_access(struct i2c_adapter * adap, u16 addr,
+ unsigned short flags, char read_write, u8 command,
+ int size, union i2c_smbus_data * data)
+{
+ int i, len;
+ int temp;
+ int timeout;
+
+ /* clear all the bits (clear-on-write) */
+ outb_p(0xFF, SMBHSTSTS);
+ /* make sure SMBus is idle */
+ temp = inb_p(SMBHSTSTS);
+ for (timeout = 0;
+ (timeout < MAX_TIMEOUT) && !(temp & ALI15X3_STS_IDLE);
+ timeout++) {
+ msleep(1);
+ temp = inb_p(SMBHSTSTS);
+ }
+ if (timeout >= MAX_TIMEOUT) {
+ dev_err(&adap->dev, "Idle wait Timeout! STS=0x%02x\n", temp);
+ }
+
+ switch (size) {
+ case I2C_SMBUS_QUICK:
+ outb_p(((addr & 0x7f) << 1) | (read_write & 0x01),
+ SMBHSTADD);
+ size = ALI15X3_QUICK;
+ break;
+ case I2C_SMBUS_BYTE:
+ outb_p(((addr & 0x7f) << 1) | (read_write & 0x01),
+ SMBHSTADD);
+ if (read_write == I2C_SMBUS_WRITE)
+ outb_p(command, SMBHSTCMD);
+ size = ALI15X3_BYTE;
+ break;
+ case I2C_SMBUS_BYTE_DATA:
+ outb_p(((addr & 0x7f) << 1) | (read_write & 0x01),
+ SMBHSTADD);
+ outb_p(command, SMBHSTCMD);
+ if (read_write == I2C_SMBUS_WRITE)
+ outb_p(data->byte, SMBHSTDAT0);
+ size = ALI15X3_BYTE_DATA;
+ break;
+ case I2C_SMBUS_WORD_DATA:
+ outb_p(((addr & 0x7f) << 1) | (read_write & 0x01),
+ SMBHSTADD);
+ outb_p(command, SMBHSTCMD);
+ if (read_write == I2C_SMBUS_WRITE) {
+ outb_p(data->word & 0xff, SMBHSTDAT0);
+ outb_p((data->word & 0xff00) >> 8, SMBHSTDAT1);
+ }
+ size = ALI15X3_WORD_DATA;
+ break;
+ case I2C_SMBUS_BLOCK_DATA:
+ outb_p(((addr & 0x7f) << 1) | (read_write & 0x01),
+ SMBHSTADD);
+ outb_p(command, SMBHSTCMD);
+ if (read_write == I2C_SMBUS_WRITE) {
+ len = data->block[0];
+ if (len < 0) {
+ len = 0;
+ data->block[0] = len;
+ }
+ if (len > 32) {
+ len = 32;
+ data->block[0] = len;
+ }
+ outb_p(len, SMBHSTDAT0);
+ /* Reset SMBBLKDAT */
+ outb_p(inb_p(SMBHSTCNT) | ALI15X3_BLOCK_CLR, SMBHSTCNT);
+ for (i = 1; i <= len; i++)
+ outb_p(data->block[i], SMBBLKDAT);
+ }
+ size = ALI15X3_BLOCK_DATA;
+ break;
+ default:
+ dev_warn(&adap->dev, "Unsupported transaction %d\n", size);
+ return -EOPNOTSUPP;
+ }
+
+ outb_p(size, SMBHSTCNT); /* output command */
+
+ temp = ali15x3_transaction(adap);
+ if (temp)
+ return temp;
+
+ if ((read_write == I2C_SMBUS_WRITE) || (size == ALI15X3_QUICK))
+ return 0;
+
+
+ switch (size) {
+ case ALI15X3_BYTE: /* Result put in SMBHSTDAT0 */
+ data->byte = inb_p(SMBHSTDAT0);
+ break;
+ case ALI15X3_BYTE_DATA:
+ data->byte = inb_p(SMBHSTDAT0);
+ break;
+ case ALI15X3_WORD_DATA:
+ data->word = inb_p(SMBHSTDAT0) + (inb_p(SMBHSTDAT1) << 8);
+ break;
+ case ALI15X3_BLOCK_DATA:
+ len = inb_p(SMBHSTDAT0);
+ if (len > 32)
+ len = 32;
+ data->block[0] = len;
+ /* Reset SMBBLKDAT */
+ outb_p(inb_p(SMBHSTCNT) | ALI15X3_BLOCK_CLR, SMBHSTCNT);
+ 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;
+ }
+ return 0;
+}
+
+static u32 ali15x3_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 const struct i2c_algorithm smbus_algorithm = {
+ .smbus_xfer = ali15x3_access,
+ .functionality = ali15x3_func,
+};
+
+static struct i2c_adapter ali15x3_adapter = {
+ .owner = THIS_MODULE,
+ .class = I2C_CLASS_HWMON | I2C_CLASS_SPD,
+ .algo = &smbus_algorithm,
+};
+
+static const struct pci_device_id ali15x3_ids[] = {
+ { PCI_DEVICE(PCI_VENDOR_ID_AL, PCI_DEVICE_ID_AL_M7101) },
+ { 0, }
+};
+
+MODULE_DEVICE_TABLE (pci, ali15x3_ids);
+
+static int ali15x3_probe(struct pci_dev *dev, const struct pci_device_id *id)
+{
+ if (ali15x3_setup(dev)) {
+ dev_err(&dev->dev,
+ "ALI15X3 not detected, module not inserted.\n");
+ return -ENODEV;
+ }
+
+ /* set up the sysfs linkage to our parent device */
+ ali15x3_adapter.dev.parent = &dev->dev;
+
+ snprintf(ali15x3_adapter.name, sizeof(ali15x3_adapter.name),
+ "SMBus ALI15X3 adapter at %04x", ali15x3_smba);
+ return i2c_add_adapter(&ali15x3_adapter);
+}
+
+static void ali15x3_remove(struct pci_dev *dev)
+{
+ i2c_del_adapter(&ali15x3_adapter);
+ release_region(ali15x3_smba, ALI15X3_SMB_IOSIZE);
+}
+
+static struct pci_driver ali15x3_driver = {
+ .name = "ali15x3_smbus",
+ .id_table = ali15x3_ids,
+ .probe = ali15x3_probe,
+ .remove = ali15x3_remove,
+};
+
+module_pci_driver(ali15x3_driver);
+
+MODULE_AUTHOR ("Frodo Looijaard <frodol@dds.nl>, "
+ "Philip Edelbrock <phil@netroedge.com>, "
+ "and Mark D. Studebaker <mdsxyz123@yahoo.com>");
+MODULE_DESCRIPTION("ALI15X3 SMBus driver");
+MODULE_LICENSE("GPL");
Code Review / kvmfornfv.git / blobdiff