Adding upstream version 6.1.76.upstream/6.1.76upstream

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 532 insertions, 0 deletions

diff --git a/drivers/i2c/busses/i2c-ali1535.c b/drivers/i2c/busses/i2c-ali1535.c
new file mode 100644
index 000000000..ee83c4581
--- /dev/null
+++ b/drivers/i2c/busses/i2c-ali1535.c
@@ -0,0 +1,532 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
+/*
+ * Copyright (c) 2000  Frodo Looijaard <frodol@dds.nl>,
+ *                      Philip Edelbrock <phil@netroedge.com>,
+ *                      Mark D. Studebaker <mdsxyz123@yahoo.com>,
+ *                      Dan Eaton <dan.eaton@rocketlogix.com> and
+ *                      Stephen Rousset <stephen.rousset@rocketlogix.com>
+*/
+
+/*
+    This is the driver for the SMB Host controller on
+    Acer Labs Inc. (ALI) M1535 South Bridge.
+
+    The M1535 is a South bridge for portable systems.
+    It is very similar to the M15x3 South bridges also produced
+    by Acer Labs Inc.  Some of the registers within the part
+    have moved and some have been redefined slightly. Additionally,
+    the sequencing of the SMBus transactions has been modified
+    to be more consistent with the sequencing recommended by
+    the manufacturer and observed through testing.  These
+    changes are reflected in this driver and can be identified
+    by comparing this driver to the i2c-ali15x3 driver.
+    For an overview of these chips see http://www.acerlabs.com
+
+    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.
+
+    This driver does not use interrupts.
+*/
+
+
+/* Note: we assume there can only be one ALI1535, 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/i2c.h>
+#include <linux/acpi.h>
+#include <linux/io.h>
+
+
+/* ALI1535 SMBus address offsets */
+#define SMBHSTSTS	(0 + ali1535_smba)
+#define SMBHSTTYP	(1 + ali1535_smba)
+#define SMBHSTPORT	(2 + ali1535_smba)
+#define SMBHSTCMD	(7 + ali1535_smba)
+#define SMBHSTADD	(3 + ali1535_smba)
+#define SMBHSTDAT0	(4 + ali1535_smba)
+#define SMBHSTDAT1	(5 + ali1535_smba)
+#define SMBBLKDAT	(6 + ali1535_smba)
+
+/* PCI Address Constants */
+#define SMBCOM		0x004
+#define SMBREV		0x008
+#define SMBCFG		0x0D1
+#define SMBBA		0x0E2
+#define SMBHSTCFG	0x0F0
+#define SMBCLK		0x0F2
+
+/* Other settings */
+#define MAX_TIMEOUT		500	/* times 1/100 sec */
+#define ALI1535_SMB_IOSIZE	32
+
+#define ALI1535_SMB_DEFAULTBASE	0x8040
+
+/* ALI1535 address lock bits */
+#define ALI1535_LOCK		0x06	/* dwe */
+
+/* ALI1535 command constants */
+#define ALI1535_QUICK		0x00
+#define ALI1535_BYTE		0x10
+#define ALI1535_BYTE_DATA	0x20
+#define ALI1535_WORD_DATA	0x30
+#define ALI1535_BLOCK_DATA	0x40
+#define ALI1535_I2C_READ	0x60
+
+#define	ALI1535_DEV10B_EN	0x80	/* Enable 10-bit addressing in	*/
+					/*  I2C read			*/
+#define	ALI1535_T_OUT		0x08	/* Time-out Command (write)	*/
+#define	ALI1535_A_HIGH_BIT9	0x08	/* Bit 9 of 10-bit address in	*/
+					/* Alert-Response-Address	*/
+					/* (read)			*/
+#define	ALI1535_KILL		0x04	/* Kill Command (write)		*/
+#define	ALI1535_A_HIGH_BIT8	0x04	/* Bit 8 of 10-bit address in	*/
+					/*  Alert-Response-Address	*/
+					/*  (read)			*/
+
+#define	ALI1535_D_HI_MASK	0x03	/* Mask for isolating bits 9-8	*/
+					/*  of 10-bit address in I2C	*/
+					/*  Read Command		*/
+
+/* ALI1535 status register bits */
+#define ALI1535_STS_IDLE	0x04
+#define ALI1535_STS_BUSY	0x08	/* host busy */
+#define ALI1535_STS_DONE	0x10	/* transaction complete */
+#define ALI1535_STS_DEV		0x20	/* device error */
+#define ALI1535_STS_BUSERR	0x40	/* bus error    */
+#define ALI1535_STS_FAIL	0x80	/* failed bus transaction */
+#define ALI1535_STS_ERR		0xE0	/* all the bad error bits */
+
+#define ALI1535_BLOCK_CLR	0x04	/* reset block data index */
+
+/* ALI1535 device address register bits */
+#define	ALI1535_RD_ADDR		0x01	/* Read/Write Bit in Device	*/
+					/*  Address field		*/
+					/*  -> Write = 0		*/
+					/*  -> Read  = 1		*/
+#define	ALI1535_SMBIO_EN	0x04	/* SMB I/O Space enable		*/
+
+static struct pci_driver ali1535_driver;
+static unsigned long ali1535_smba;
+static unsigned short ali1535_offset;
+
+/* Detect whether a ALI1535 can be found, and initialize it, where necessary.
+   Note the differences between kernels with the old PCI BIOS interface and
+   newer kernels with the real PCI interface. In compat.h some things are
+   defined to make the transition easier. */
+static int ali1535_setup(struct pci_dev *dev)
+{
+	int retval;
+	unsigned char temp;
+
+	/* Check the following things:
+		- SMB I/O address is initialized
+		- Device is enabled
+		- We can use the addresses
+	*/
+
+	retval = pci_enable_device(dev);
+	if (retval) {
+		dev_err(&dev->dev, "ALI1535_smb can't enable device\n");
+		goto exit;
+	}
+
+	/* Determine the address of the SMBus area */
+	pci_read_config_word(dev, SMBBA, &ali1535_offset);
+	dev_dbg(&dev->dev, "ALI1535_smb is at offset 0x%04x\n", ali1535_offset);
+	ali1535_offset &= (0xffff & ~(ALI1535_SMB_IOSIZE - 1));
+	if (ali1535_offset == 0) {
+		dev_warn(&dev->dev,
+			"ALI1535_smb region uninitialized - upgrade BIOS?\n");
+		retval = -ENODEV;
+		goto exit;
+	}
+
+	if (pci_resource_flags(dev, 0) & IORESOURCE_IO)
+		ali1535_smba = pci_resource_start(dev, 0) + ali1535_offset;
+	else
+		ali1535_smba = ali1535_offset;
+
+	retval = acpi_check_region(ali1535_smba, ALI1535_SMB_IOSIZE,
+				   ali1535_driver.name);
+	if (retval)
+		goto exit;
+
+	if (!request_region(ali1535_smba, ALI1535_SMB_IOSIZE,
+			    ali1535_driver.name)) {
+		dev_err(&dev->dev, "ALI1535_smb region 0x%lx already in use!\n",
+			ali1535_smba);
+		retval = -EBUSY;
+		goto exit;
+	}
+
+	/* check if whole device is enabled */
+	pci_read_config_byte(dev, SMBCFG, &temp);
+	if ((temp & ALI1535_SMBIO_EN) == 0) {
+		dev_err(&dev->dev, "SMB device not enabled - upgrade BIOS?\n");
+		retval = -ENODEV;
+		goto exit_free;
+	}
+
+	/* Is SMB Host controller enabled? */
+	pci_read_config_byte(dev, SMBHSTCFG, &temp);
+	if ((temp & 1) == 0) {
+		dev_err(&dev->dev, "SMBus controller not enabled - upgrade BIOS?\n");
+		retval = -ENODEV;
+		goto exit_free;
+	}
+
+	/* set SMB clock to 74KHz as recommended in data sheet */
+	pci_write_config_byte(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(&dev->dev, "ALI1535 using Interrupt 9 for SMBus.\n");
+	*/
+	pci_read_config_byte(dev, SMBREV, &temp);
+	dev_dbg(&dev->dev, "SMBREV = 0x%X\n", temp);
+	dev_dbg(&dev->dev, "ALI1535_smba = 0x%lx\n", ali1535_smba);
+
+	return 0;
+
+exit_free:
+	release_region(ali1535_smba, ALI1535_SMB_IOSIZE);
+exit:
+	return retval;
+}
+
+static int ali1535_transaction(struct i2c_adapter *adap)
+{
+	int temp;
+	int result = 0;
+	int timeout = 0;
+
+	dev_dbg(&adap->dev, "Transaction (pre): STS=%02x, TYP=%02x, "
+		"CMD=%02x, ADD=%02x, DAT0=%02x, DAT1=%02x\n",
+		inb_p(SMBHSTSTS), inb_p(SMBHSTTYP), 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 & ALI1535_STS_BUSY) {
+		/* If the host controller is still busy, it may have timed out
+		 * in the previous transaction, resulting in a "SMBus Timeout"
+		 * printk.  I've tried the following to reset a stuck busy bit.
+		 *   1. Reset the controller with an KILL 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.
+		 */
+
+		/* 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(ALI1535_T_OUT, SMBHSTTYP);
+		temp = inb_p(SMBHSTSTS);
+	}
+
+	/* now check the error bits and the busy bit */
+	if (temp & (ALI1535_STS_ERR | ALI1535_STS_BUSY)) {
+		/* do a clear-on-write */
+		outb_p(0xFF, SMBHSTSTS);
+		temp = inb_p(SMBHSTSTS);
+		if (temp & (ALI1535_STS_ERR | ALI1535_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 & ALI1535_STS_DONE)
+			outb_p(temp, SMBHSTSTS);
+	}
+
+	/* start the transaction by writing anything to the start register */
+	outb_p(0xFF, SMBHSTPORT);
+
+	/* We will always wait for a fraction of a second! */
+	timeout = 0;
+	do {
+		usleep_range(1000, 2000);
+		temp = inb_p(SMBHSTSTS);
+	} while (((temp & ALI1535_STS_BUSY) && !(temp & ALI1535_STS_IDLE))
+		 && (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 & ALI1535_STS_FAIL) {
+		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 & ALI1535_STS_BUSERR) {
+		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 & ALI1535_STS_DEV) {
+		result = -EIO;
+		dev_err(&adap->dev, "Error: device error\n");
+	}
+
+	/* check to see if the "command complete" indication is set */
+	if (!(temp & ALI1535_STS_DONE)) {
+		result = -ETIMEDOUT;
+		dev_err(&adap->dev, "Error: command never completed\n");
+	}
+
+	dev_dbg(&adap->dev, "Transaction (post): STS=%02x, TYP=%02x, "
+		"CMD=%02x, ADD=%02x, DAT0=%02x, DAT1=%02x\n",
+		inb_p(SMBHSTSTS), inb_p(SMBHSTTYP), inb_p(SMBHSTCMD),
+		inb_p(SMBHSTADD), inb_p(SMBHSTDAT0), inb_p(SMBHSTDAT1));
+
+	/* take consequent actions for error conditions */
+	if (!(temp & ALI1535_STS_DONE)) {
+		/* issue "kill" to reset host controller */
+		outb_p(ALI1535_KILL, SMBHSTTYP);
+		outb_p(0xFF, SMBHSTSTS);
+	} else if (temp & ALI1535_STS_ERR) {
+		/* issue "timeout" to reset all devices on bus */
+		outb_p(ALI1535_T_OUT, SMBHSTTYP);
+		outb_p(0xFF, SMBHSTSTS);
+	}
+
+	return result;
+}
+
+/* Return negative errno on error. */
+static s32 ali1535_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;
+	s32 result = 0;
+
+	/* make sure SMBus is idle */
+	temp = inb_p(SMBHSTSTS);
+	for (timeout = 0;
+	     (timeout < MAX_TIMEOUT) && !(temp & ALI1535_STS_IDLE);
+	     timeout++) {
+		usleep_range(1000, 2000);
+		temp = inb_p(SMBHSTSTS);
+	}
+	if (timeout >= MAX_TIMEOUT)
+		dev_warn(&adap->dev, "Idle wait Timeout! STS=0x%02x\n", temp);
+
+	/* clear status register (clear-on-write) */
+	outb_p(0xFF, SMBHSTSTS);
+
+	switch (size) {
+	case I2C_SMBUS_QUICK:
+		outb_p(((addr & 0x7f) << 1) | (read_write & 0x01),
+		       SMBHSTADD);
+		size = ALI1535_QUICK;
+		outb_p(size, SMBHSTTYP);	/* output command */
+		break;
+	case I2C_SMBUS_BYTE:
+		outb_p(((addr & 0x7f) << 1) | (read_write & 0x01),
+		       SMBHSTADD);
+		size = ALI1535_BYTE;
+		outb_p(size, SMBHSTTYP);	/* output command */
+		if (read_write == I2C_SMBUS_WRITE)
+			outb_p(command, SMBHSTCMD);
+		break;
+	case I2C_SMBUS_BYTE_DATA:
+		outb_p(((addr & 0x7f) << 1) | (read_write & 0x01),
+		       SMBHSTADD);
+		size = ALI1535_BYTE_DATA;
+		outb_p(size, SMBHSTTYP);	/* output command */
+		outb_p(command, SMBHSTCMD);
+		if (read_write == I2C_SMBUS_WRITE)
+			outb_p(data->byte, SMBHSTDAT0);
+		break;
+	case I2C_SMBUS_WORD_DATA:
+		outb_p(((addr & 0x7f) << 1) | (read_write & 0x01),
+		       SMBHSTADD);
+		size = ALI1535_WORD_DATA;
+		outb_p(size, SMBHSTTYP);	/* output command */
+		outb_p(command, SMBHSTCMD);
+		if (read_write == I2C_SMBUS_WRITE) {
+			outb_p(data->word & 0xff, SMBHSTDAT0);
+			outb_p((data->word & 0xff00) >> 8, SMBHSTDAT1);
+		}
+		break;
+	case I2C_SMBUS_BLOCK_DATA:
+		outb_p(((addr & 0x7f) << 1) | (read_write & 0x01),
+		       SMBHSTADD);
+		size = ALI1535_BLOCK_DATA;
+		outb_p(size, SMBHSTTYP);	/* output command */
+		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(SMBHSTTYP) | ALI1535_BLOCK_CLR, SMBHSTTYP);
+			for (i = 1; i <= len; i++)
+				outb_p(data->block[i], SMBBLKDAT);
+		}
+		break;
+	default:
+		dev_warn(&adap->dev, "Unsupported transaction %d\n", size);
+		result = -EOPNOTSUPP;
+		goto EXIT;
+	}
+
+	result = ali1535_transaction(adap);
+	if (result)
+		goto EXIT;
+
+	if ((read_write == I2C_SMBUS_WRITE) || (size == ALI1535_QUICK)) {
+		result = 0;
+		goto EXIT;
+	}
+
+	switch (size) {
+	case ALI1535_BYTE:	/* Result put in SMBHSTDAT0 */
+		data->byte = inb_p(SMBHSTDAT0);
+		break;
+	case ALI1535_BYTE_DATA:
+		data->byte = inb_p(SMBHSTDAT0);
+		break;
+	case ALI1535_WORD_DATA:
+		data->word = inb_p(SMBHSTDAT0) + (inb_p(SMBHSTDAT1) << 8);
+		break;
+	case ALI1535_BLOCK_DATA:
+		len = inb_p(SMBHSTDAT0);
+		if (len > 32)
+			len = 32;
+		data->block[0] = len;
+		/* Reset SMBBLKDAT */
+		outb_p(inb_p(SMBHSTTYP) | ALI1535_BLOCK_CLR, SMBHSTTYP);
+		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:
+	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 const struct i2c_algorithm smbus_algorithm = {
+	.smbus_xfer	= ali1535_access,
+	.functionality	= ali1535_func,
+};
+
+static struct i2c_adapter ali1535_adapter = {
+	.owner		= THIS_MODULE,
+	.class          = I2C_CLASS_HWMON | I2C_CLASS_SPD,
+	.algo		= &smbus_algorithm,
+};
+
+static const 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 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 sysfs linkage to our parent device */
+	ali1535_adapter.dev.parent = &dev->dev;
+
+	snprintf(ali1535_adapter.name, sizeof(ali1535_adapter.name),
+		"SMBus ALI1535 adapter at %04x", ali1535_offset);
+	return i2c_add_adapter(&ali1535_adapter);
+}
+
+static void ali1535_remove(struct pci_dev *dev)
+{
+	i2c_del_adapter(&ali1535_adapter);
+	release_region(ali1535_smba, ALI1535_SMB_IOSIZE);
+
+	/*
+	 * do not call pci_disable_device(dev) since it can cause hard hangs on
+	 * some systems during power-off
+	 */
+}
+
+static struct pci_driver ali1535_driver = {
+	.name		= "ali1535_smbus",
+	.id_table	= ali1535_ids,
+	.probe		= ali1535_probe,
+	.remove		= ali1535_remove,
+};
+
+module_pci_driver(ali1535_driver);
+
+MODULE_AUTHOR("Frodo Looijaard <frodol@dds.nl>");
+MODULE_AUTHOR("Philip Edelbrock <phil@netroedge.com>");
+MODULE_AUTHOR("Mark D. Studebaker <mdsxyz123@yahoo.com>");
+MODULE_AUTHOR("Dan Eaton <dan.eaton@rocketlogix.com>");
+MODULE_DESCRIPTION("ALI1535 SMBus driver");
+MODULE_LICENSE("GPL");