Adding upstream version 6.6.15.upstream/6.6.15

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

1 files changed, 549 insertions, 0 deletions

diff --git a/drivers/i2c/busses/i2c-sis630.c b/drivers/i2c/busses/i2c-sis630.c
new file mode 100644
index 0000000000..87d56250d7
--- /dev/null
+++ b/drivers/i2c/busses/i2c-sis630.c
@@ -0,0 +1,549 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
+/*
+    Copyright (c) 2002,2003 Alexander Malysh <amalysh@web.de>
+
+*/
+
+/*
+   Status: beta
+
+   Supports:
+	SIS 630
+	SIS 730
+	SIS 964
+
+   Notable differences between chips:
+	+------------------------+--------------------+-------------------+
+	|                        |     SIS630/730     |      SIS964       |
+	+------------------------+--------------------+-------------------+
+	| Clock                  | 14kHz/56kHz        | 55.56kHz/27.78kHz |
+	| SMBus registers offset | 0x80               | 0xE0              |
+	| SMB_CNT                | Bit 1 = Slave Busy | Bit 1 = Bus probe |
+	|         (not used yet) | Bit 3 is reserved  | Bit 3 = Last byte |
+	| SMB_PCOUNT		 | Offset + 0x06      | Offset + 0x14     |
+	| SMB_COUNT              | 4:0 bits           | 5:0 bits          |
+	+------------------------+--------------------+-------------------+
+	(Other differences don't affect the functions provided by the driver)
+
+   Note: we assume there can only be one device, with one SMBus interface.
+*/
+
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/delay.h>
+#include <linux/pci.h>
+#include <linux/ioport.h>
+#include <linux/i2c.h>
+#include <linux/acpi.h>
+#include <linux/io.h>
+
+/* SIS964 id is defined here as we are the only file using it */
+#define PCI_DEVICE_ID_SI_964	0x0964
+
+/* SIS630/730/964 SMBus registers */
+#define SMB_STS			0x00	/* status */
+#define SMB_CNT			0x02	/* control */
+#define SMBHOST_CNT		0x03	/* host control */
+#define SMB_ADDR		0x04	/* address */
+#define SMB_CMD			0x05	/* command */
+#define SMB_COUNT		0x07	/* byte count */
+#define SMB_BYTE		0x08	/* ~0x8F data byte field */
+
+/* SMB_STS register */
+#define BYTE_DONE_STS		0x10	/* Byte Done Status / Block Array */
+#define SMBCOL_STS		0x04	/* Collision */
+#define SMBERR_STS		0x02	/* Device error */
+
+/* SMB_CNT register */
+#define MSTO_EN			0x40	/* Host Master Timeout Enable */
+#define SMBCLK_SEL		0x20	/* Host master clock selection */
+#define SMB_PROBE		0x02	/* Bus Probe/Slave busy */
+#define SMB_HOSTBUSY		0x01	/* Host Busy */
+
+/* SMBHOST_CNT register */
+#define SMB_KILL		0x20	/* Kill */
+#define SMB_START		0x10	/* Start */
+
+/* register count for request_region
+ * As we don't use SMB_PCOUNT, 20 is ok for SiS630 and SiS964
+ */
+#define SIS630_SMB_IOREGION	20
+
+/* PCI address constants */
+/* acpi base address register  */
+#define SIS630_ACPI_BASE_REG	0x74
+/* bios control register */
+#define SIS630_BIOS_CTL_REG	0x40
+
+/* Other settings */
+#define MAX_TIMEOUT		500
+
+/* SIS630 constants */
+#define SIS630_QUICK		0x00
+#define SIS630_BYTE		0x01
+#define SIS630_BYTE_DATA	0x02
+#define SIS630_WORD_DATA	0x03
+#define SIS630_PCALL		0x04
+#define SIS630_BLOCK_DATA	0x05
+
+static struct pci_driver sis630_driver;
+
+/* insmod parameters */
+static bool high_clock;
+static bool force;
+module_param(high_clock, bool, 0);
+MODULE_PARM_DESC(high_clock,
+	"Set Host Master Clock to 56KHz (default 14KHz) (SIS630/730 only).");
+module_param(force, bool, 0);
+MODULE_PARM_DESC(force, "Forcibly enable the SIS630. DANGEROUS!");
+
+/* SMBus base address */
+static unsigned short smbus_base;
+
+/* supported chips */
+static int supported[] = {
+	PCI_DEVICE_ID_SI_630,
+	PCI_DEVICE_ID_SI_730,
+	PCI_DEVICE_ID_SI_760,
+	0 /* terminates the list */
+};
+
+static inline u8 sis630_read(u8 reg)
+{
+	return inb(smbus_base + reg);
+}
+
+static inline void sis630_write(u8 reg, u8 data)
+{
+	outb(data, smbus_base + reg);
+}
+
+static int sis630_transaction_start(struct i2c_adapter *adap, int size,
+				    u8 *oldclock)
+{
+	int temp;
+
+	/* Make sure the SMBus host is ready to start transmitting. */
+	temp = sis630_read(SMB_CNT);
+	if ((temp & (SMB_PROBE | SMB_HOSTBUSY)) != 0x00) {
+		dev_dbg(&adap->dev, "SMBus busy (%02x). Resetting...\n", temp);
+		/* kill smbus transaction */
+		sis630_write(SMBHOST_CNT, SMB_KILL);
+
+		temp = sis630_read(SMB_CNT);
+		if (temp & (SMB_PROBE | SMB_HOSTBUSY)) {
+			dev_dbg(&adap->dev, "Failed! (%02x)\n", temp);
+			return -EBUSY;
+		} else {
+			dev_dbg(&adap->dev, "Successful!\n");
+		}
+	}
+
+	/* save old clock, so we can prevent machine for hung */
+	*oldclock = sis630_read(SMB_CNT);
+
+	dev_dbg(&adap->dev, "saved clock 0x%02x\n", *oldclock);
+
+	/* disable timeout interrupt,
+	 * set Host Master Clock to 56KHz if requested */
+	if (high_clock)
+		sis630_write(SMB_CNT, SMBCLK_SEL);
+	else
+		sis630_write(SMB_CNT, (*oldclock & ~MSTO_EN));
+
+	/* clear all sticky bits */
+	temp = sis630_read(SMB_STS);
+	sis630_write(SMB_STS, temp & 0x1e);
+
+	/* start the transaction by setting bit 4 and size */
+	sis630_write(SMBHOST_CNT, SMB_START | (size & 0x07));
+
+	return 0;
+}
+
+static int sis630_transaction_wait(struct i2c_adapter *adap, int size)
+{
+	int temp, result = 0, timeout = 0;
+
+	/* We will always wait for a fraction of a second! */
+	do {
+		msleep(1);
+		temp = sis630_read(SMB_STS);
+		/* check if block transmitted */
+		if (size == SIS630_BLOCK_DATA && (temp & BYTE_DONE_STS))
+			break;
+	} while (!(temp & 0x0e) && (timeout++ < MAX_TIMEOUT));
+
+	/* If the SMBus is still busy, we give up */
+	if (timeout > MAX_TIMEOUT) {
+		dev_dbg(&adap->dev, "SMBus Timeout!\n");
+		result = -ETIMEDOUT;
+	}
+
+	if (temp & SMBERR_STS) {
+		dev_dbg(&adap->dev, "Error: Failed bus transaction\n");
+		result = -ENXIO;
+	}
+
+	if (temp & SMBCOL_STS) {
+		dev_err(&adap->dev, "Bus collision!\n");
+		result = -EAGAIN;
+	}
+
+	return result;
+}
+
+static void sis630_transaction_end(struct i2c_adapter *adap, u8 oldclock)
+{
+	/* clear all status "sticky" bits */
+	sis630_write(SMB_STS, 0xFF);
+
+	dev_dbg(&adap->dev,
+		"SMB_CNT before clock restore 0x%02x\n", sis630_read(SMB_CNT));
+
+	/*
+	 * restore old Host Master Clock if high_clock is set
+	 * and oldclock was not 56KHz
+	 */
+	if (high_clock && !(oldclock & SMBCLK_SEL))
+		sis630_write(SMB_CNT, sis630_read(SMB_CNT) & ~SMBCLK_SEL);
+
+	dev_dbg(&adap->dev,
+		"SMB_CNT after clock restore 0x%02x\n", sis630_read(SMB_CNT));
+}
+
+static int sis630_transaction(struct i2c_adapter *adap, int size)
+{
+	int result = 0;
+	u8 oldclock = 0;
+
+	result = sis630_transaction_start(adap, size, &oldclock);
+	if (!result) {
+		result = sis630_transaction_wait(adap, size);
+		sis630_transaction_end(adap, oldclock);
+	}
+
+	return result;
+}
+
+static int sis630_block_data(struct i2c_adapter *adap,
+			     union i2c_smbus_data *data, int read_write)
+{
+	int i, len = 0, rc = 0;
+	u8 oldclock = 0;
+
+	if (read_write == I2C_SMBUS_WRITE) {
+		len = data->block[0];
+		if (len < 0)
+			len = 0;
+		else if (len > 32)
+			len = 32;
+		sis630_write(SMB_COUNT, len);
+		for (i = 1; i <= len; i++) {
+			dev_dbg(&adap->dev,
+				"set data 0x%02x\n", data->block[i]);
+			/* set data */
+			sis630_write(SMB_BYTE + (i - 1) % 8, data->block[i]);
+			if (i == 8 || (len < 8 && i == len)) {
+				dev_dbg(&adap->dev,
+					"start trans len=%d i=%d\n", len, i);
+				/* first transaction */
+				rc = sis630_transaction_start(adap,
+						SIS630_BLOCK_DATA, &oldclock);
+				if (rc)
+					return rc;
+			} else if ((i - 1) % 8 == 7 || i == len) {
+				dev_dbg(&adap->dev,
+					"trans_wait len=%d i=%d\n", len, i);
+				if (i > 8) {
+					dev_dbg(&adap->dev,
+						"clear smbary_sts"
+						" len=%d i=%d\n", len, i);
+					/*
+					   If this is not first transaction,
+					   we must clear sticky bit.
+					   clear SMBARY_STS
+					*/
+					sis630_write(SMB_STS, BYTE_DONE_STS);
+				}
+				rc = sis630_transaction_wait(adap,
+						SIS630_BLOCK_DATA);
+				if (rc) {
+					dev_dbg(&adap->dev,
+						"trans_wait failed\n");
+					break;
+				}
+			}
+		}
+	} else {
+		/* read request */
+		data->block[0] = len = 0;
+		rc = sis630_transaction_start(adap,
+				SIS630_BLOCK_DATA, &oldclock);
+		if (rc)
+			return rc;
+		do {
+			rc = sis630_transaction_wait(adap, SIS630_BLOCK_DATA);
+			if (rc) {
+				dev_dbg(&adap->dev, "trans_wait failed\n");
+				break;
+			}
+			/* if this first transaction then read byte count */
+			if (len == 0)
+				data->block[0] = sis630_read(SMB_COUNT);
+
+			/* just to be sure */
+			if (data->block[0] > 32)
+				data->block[0] = 32;
+
+			dev_dbg(&adap->dev,
+				"block data read len=0x%x\n", data->block[0]);
+
+			for (i = 0; i < 8 && len < data->block[0]; i++, len++) {
+				dev_dbg(&adap->dev,
+					"read i=%d len=%d\n", i, len);
+				data->block[len + 1] = sis630_read(SMB_BYTE +
+								   i);
+			}
+
+			dev_dbg(&adap->dev,
+				"clear smbary_sts len=%d i=%d\n", len, i);
+
+			/* clear SMBARY_STS */
+			sis630_write(SMB_STS, BYTE_DONE_STS);
+		} while (len < data->block[0]);
+	}
+
+	sis630_transaction_end(adap, oldclock);
+
+	return rc;
+}
+
+/* Return negative errno on error. */
+static s32 sis630_access(struct i2c_adapter *adap, u16 addr,
+			 unsigned short flags, char read_write,
+			 u8 command, int size, union i2c_smbus_data *data)
+{
+	int status;
+
+	switch (size) {
+	case I2C_SMBUS_QUICK:
+		sis630_write(SMB_ADDR,
+			     ((addr & 0x7f) << 1) | (read_write & 0x01));
+		size = SIS630_QUICK;
+		break;
+	case I2C_SMBUS_BYTE:
+		sis630_write(SMB_ADDR,
+			     ((addr & 0x7f) << 1) | (read_write & 0x01));
+		if (read_write == I2C_SMBUS_WRITE)
+			sis630_write(SMB_CMD, command);
+		size = SIS630_BYTE;
+		break;
+	case I2C_SMBUS_BYTE_DATA:
+		sis630_write(SMB_ADDR,
+			     ((addr & 0x7f) << 1) | (read_write & 0x01));
+		sis630_write(SMB_CMD, command);
+		if (read_write == I2C_SMBUS_WRITE)
+			sis630_write(SMB_BYTE, data->byte);
+		size = SIS630_BYTE_DATA;
+		break;
+	case I2C_SMBUS_PROC_CALL:
+	case I2C_SMBUS_WORD_DATA:
+		sis630_write(SMB_ADDR,
+			     ((addr & 0x7f) << 1) | (read_write & 0x01));
+		sis630_write(SMB_CMD, command);
+		if (read_write == I2C_SMBUS_WRITE) {
+			sis630_write(SMB_BYTE, data->word & 0xff);
+			sis630_write(SMB_BYTE + 1, (data->word & 0xff00) >> 8);
+		}
+		size = (size == I2C_SMBUS_PROC_CALL ?
+			SIS630_PCALL : SIS630_WORD_DATA);
+		break;
+	case I2C_SMBUS_BLOCK_DATA:
+		sis630_write(SMB_ADDR,
+			     ((addr & 0x7f) << 1) | (read_write & 0x01));
+		sis630_write(SMB_CMD, command);
+		size = SIS630_BLOCK_DATA;
+		return sis630_block_data(adap, data, read_write);
+	default:
+		dev_warn(&adap->dev, "Unsupported transaction %d\n", size);
+		return -EOPNOTSUPP;
+	}
+
+	status = sis630_transaction(adap, size);
+	if (status)
+		return status;
+
+	if ((size != SIS630_PCALL) &&
+		((read_write == I2C_SMBUS_WRITE) || (size == SIS630_QUICK))) {
+		return 0;
+	}
+
+	switch (size) {
+	case SIS630_BYTE:
+	case SIS630_BYTE_DATA:
+		data->byte = sis630_read(SMB_BYTE);
+		break;
+	case SIS630_PCALL:
+	case SIS630_WORD_DATA:
+		data->word = sis630_read(SMB_BYTE) +
+			     (sis630_read(SMB_BYTE + 1) << 8);
+		break;
+	}
+
+	return 0;
+}
+
+static u32 sis630_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_PROC_CALL | I2C_FUNC_SMBUS_BLOCK_DATA;
+}
+
+static int sis630_setup(struct pci_dev *sis630_dev)
+{
+	unsigned char b;
+	struct pci_dev *dummy = NULL;
+	int retval, i;
+	/* acpi base address */
+	unsigned short acpi_base;
+
+	/* check for supported SiS devices */
+	for (i = 0; supported[i] > 0; i++) {
+		dummy = pci_get_device(PCI_VENDOR_ID_SI, supported[i], dummy);
+		if (dummy)
+			break; /* found */
+	}
+
+	if (dummy) {
+		pci_dev_put(dummy);
+	} else if (force) {
+		dev_err(&sis630_dev->dev,
+			"WARNING: Can't detect SIS630 compatible device, but "
+			"loading because of force option enabled\n");
+	} else {
+		return -ENODEV;
+	}
+
+	/*
+	   Enable ACPI first , so we can accsess reg 74-75
+	   in acpi io space and read acpi base addr
+	*/
+	if (pci_read_config_byte(sis630_dev, SIS630_BIOS_CTL_REG, &b)) {
+		dev_err(&sis630_dev->dev, "Error: Can't read bios ctl reg\n");
+		retval = -ENODEV;
+		goto exit;
+	}
+	/* if ACPI already enabled , do nothing */
+	if (!(b & 0x80) &&
+	    pci_write_config_byte(sis630_dev, SIS630_BIOS_CTL_REG, b | 0x80)) {
+		dev_err(&sis630_dev->dev, "Error: Can't enable ACPI\n");
+		retval = -ENODEV;
+		goto exit;
+	}
+
+	/* Determine the ACPI base address */
+	if (pci_read_config_word(sis630_dev,
+				 SIS630_ACPI_BASE_REG, &acpi_base)) {
+		dev_err(&sis630_dev->dev,
+			"Error: Can't determine ACPI base address\n");
+		retval = -ENODEV;
+		goto exit;
+	}
+
+	dev_dbg(&sis630_dev->dev, "ACPI base at 0x%04hx\n", acpi_base);
+
+	if (supported[i] == PCI_DEVICE_ID_SI_760)
+		smbus_base = acpi_base + 0xE0;
+	else
+		smbus_base = acpi_base + 0x80;
+
+	dev_dbg(&sis630_dev->dev, "SMBus base at 0x%04hx\n", smbus_base);
+
+	retval = acpi_check_region(smbus_base + SMB_STS, SIS630_SMB_IOREGION,
+				   sis630_driver.name);
+	if (retval)
+		goto exit;
+
+	/* Everything is happy, let's grab the memory and set things up. */
+	if (!request_region(smbus_base + SMB_STS, SIS630_SMB_IOREGION,
+			    sis630_driver.name)) {
+		dev_err(&sis630_dev->dev,
+			"I/O Region 0x%04x-0x%04x for SMBus already in use.\n",
+			smbus_base + SMB_STS,
+			smbus_base + SMB_STS + SIS630_SMB_IOREGION - 1);
+		retval = -EBUSY;
+		goto exit;
+	}
+
+	retval = 0;
+
+exit:
+	if (retval)
+		smbus_base = 0;
+	return retval;
+}
+
+
+static const struct i2c_algorithm smbus_algorithm = {
+	.smbus_xfer	= sis630_access,
+	.functionality	= sis630_func,
+};
+
+static struct i2c_adapter sis630_adapter = {
+	.owner		= THIS_MODULE,
+	.class		= I2C_CLASS_HWMON | I2C_CLASS_SPD,
+	.algo		= &smbus_algorithm,
+	.retries	= 3
+};
+
+static const struct pci_device_id sis630_ids[] = {
+	{ PCI_DEVICE(PCI_VENDOR_ID_SI, PCI_DEVICE_ID_SI_503) },
+	{ PCI_DEVICE(PCI_VENDOR_ID_SI, PCI_DEVICE_ID_SI_LPC) },
+	{ PCI_DEVICE(PCI_VENDOR_ID_SI, PCI_DEVICE_ID_SI_964) },
+	{ 0, }
+};
+
+MODULE_DEVICE_TABLE(pci, sis630_ids);
+
+static int sis630_probe(struct pci_dev *dev, const struct pci_device_id *id)
+{
+	if (sis630_setup(dev)) {
+		dev_err(&dev->dev,
+			"SIS630 compatible bus not detected, "
+			"module not inserted.\n");
+		return -ENODEV;
+	}
+
+	/* set up the sysfs linkage to our parent device */
+	sis630_adapter.dev.parent = &dev->dev;
+
+	snprintf(sis630_adapter.name, sizeof(sis630_adapter.name),
+		 "SMBus SIS630 adapter at %04x", smbus_base + SMB_STS);
+
+	return i2c_add_adapter(&sis630_adapter);
+}
+
+static void sis630_remove(struct pci_dev *dev)
+{
+	if (smbus_base) {
+		i2c_del_adapter(&sis630_adapter);
+		release_region(smbus_base + SMB_STS, SIS630_SMB_IOREGION);
+		smbus_base = 0;
+	}
+}
+
+
+static struct pci_driver sis630_driver = {
+	.name		= "sis630_smbus",
+	.id_table	= sis630_ids,
+	.probe		= sis630_probe,
+	.remove		= sis630_remove,
+};
+
+module_pci_driver(sis630_driver);
+
+MODULE_LICENSE("GPL");
+MODULE_AUTHOR("Alexander Malysh <amalysh@web.de>");
+MODULE_DESCRIPTION("SIS630 SMBus driver");