summaryrefslogtreecommitdiffstats
path: root/drivers/i2c/busses/i2c-i801.c
diff options
context:
space:
mode:
Diffstat (limited to 'drivers/i2c/busses/i2c-i801.c')
-rw-r--r--drivers/i2c/busses/i2c-i801.c158
1 files changed, 68 insertions, 90 deletions
diff --git a/drivers/i2c/busses/i2c-i801.c b/drivers/i2c/busses/i2c-i801.c
index dfca7493362..7be1d0a3e8f 100644
--- a/drivers/i2c/busses/i2c-i801.c
+++ b/drivers/i2c/busses/i2c-i801.c
@@ -1,5 +1,5 @@
/*
- i801.c - Part of lm_sensors, Linux kernel modules for hardware
+ i2c-i801.c - Part of lm_sensors, Linux kernel modules for hardware
monitoring
Copyright (c) 1998 - 2002 Frodo Looijaard <frodol@dds.nl>,
Philip Edelbrock <phil@netroedge.com>, and Mark D. Studebaker
@@ -36,7 +36,7 @@
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 doc/busses/i2c-i801 file for details.
+ See the file Documentation/i2c/busses/i2c-i801 for details.
I2C Block Read and Process Call are not supported.
*/
@@ -66,9 +66,8 @@
#define SMBAUXCTL (13 + i801_smba) /* ICH4 only */
/* PCI Address Constants */
-#define SMBBA 0x020
+#define SMBBAR 4
#define SMBHSTCFG 0x040
-#define SMBREV 0x008
/* Host configuration bits for SMBHSTCFG */
#define SMBHSTCFG_HST_EN 1
@@ -92,92 +91,16 @@
#define I801_START 0x40
#define I801_PEC_EN 0x80 /* ICH4 only */
-/* insmod parameters */
-
-/* If force_addr is set to anything different from 0, we forcibly enable
- the I801 at the given address. VERY DANGEROUS! */
-static u16 force_addr;
-module_param(force_addr, ushort, 0);
-MODULE_PARM_DESC(force_addr,
- "Forcibly enable the I801 at the given address. "
- "EXTREMELY DANGEROUS!");
static int i801_transaction(void);
static int i801_block_transaction(union i2c_smbus_data *data, char read_write,
int command, int hwpec);
-static unsigned short i801_smba;
+static unsigned long i801_smba;
static struct pci_driver i801_driver;
static struct pci_dev *I801_dev;
static int isich4;
-static int i801_setup(struct pci_dev *dev)
-{
- int error_return = 0;
- unsigned char temp;
-
- /* Note: we keep on searching until we have found 'function 3' */
- if(PCI_FUNC(dev->devfn) != 3)
- return -ENODEV;
-
- I801_dev = dev;
- if ((dev->device == PCI_DEVICE_ID_INTEL_82801DB_3) ||
- (dev->device == PCI_DEVICE_ID_INTEL_82801EB_3) ||
- (dev->device == PCI_DEVICE_ID_INTEL_ESB_4))
- isich4 = 1;
- else
- isich4 = 0;
-
- /* Determine the address of the SMBus areas */
- if (force_addr) {
- i801_smba = force_addr & 0xfff0;
- } else {
- pci_read_config_word(I801_dev, SMBBA, &i801_smba);
- i801_smba &= 0xfff0;
- if(i801_smba == 0) {
- dev_err(&dev->dev, "SMB base address uninitialized "
- "- upgrade BIOS or use force_addr=0xaddr\n");
- return -ENODEV;
- }
- }
-
- if (!request_region(i801_smba, (isich4 ? 16 : 8), i801_driver.name)) {
- dev_err(&dev->dev, "I801_smb region 0x%x already in use!\n",
- i801_smba);
- error_return = -EBUSY;
- goto END;
- }
-
- pci_read_config_byte(I801_dev, SMBHSTCFG, &temp);
- temp &= ~SMBHSTCFG_I2C_EN; /* SMBus timing */
- pci_write_config_byte(I801_dev, SMBHSTCFG, temp);
-
- /* If force_addr is set, we program the new address here. Just to make
- sure, we disable the device first. */
- if (force_addr) {
- pci_write_config_byte(I801_dev, SMBHSTCFG, temp & 0xfe);
- pci_write_config_word(I801_dev, SMBBA, i801_smba);
- pci_write_config_byte(I801_dev, SMBHSTCFG, temp | 0x01);
- dev_warn(&dev->dev, "WARNING: I801 SMBus interface set to "
- "new address %04x!\n", i801_smba);
- } else if ((temp & 1) == 0) {
- pci_write_config_byte(I801_dev, SMBHSTCFG, temp | 1);
- dev_warn(&dev->dev, "enabling SMBus device\n");
- }
-
- if (temp & 0x02)
- dev_dbg(&dev->dev, "I801 using Interrupt SMI# for SMBus.\n");
- else
- dev_dbg(&dev->dev, "I801 using PCI Interrupt for SMBus.\n");
-
- pci_read_config_byte(I801_dev, SMBREV, &temp);
- dev_dbg(&dev->dev, "SMBREV = 0x%X\n", temp);
- dev_dbg(&dev->dev, "I801_smba = 0x%X\n", i801_smba);
-
-END:
- return error_return;
-}
-
static int i801_transaction(void)
{
int temp;
@@ -334,8 +257,8 @@ static int i801_block_transaction(union i2c_smbus_data *data, char read_write,
/* We will always wait for a fraction of a second! */
timeout = 0;
do {
- temp = inb_p(SMBHSTSTS);
msleep(1);
+ temp = inb_p(SMBHSTSTS);
}
while ((!(temp & 0x80))
&& (timeout++ < MAX_TIMEOUT));
@@ -393,8 +316,8 @@ static int i801_block_transaction(union i2c_smbus_data *data, char read_write,
/* wait for INTR bit as advised by Intel */
timeout = 0;
do {
- temp = inb_p(SMBHSTSTS);
msleep(1);
+ temp = inb_p(SMBHSTSTS);
} while ((!(temp & 0x02))
&& (timeout++ < MAX_TIMEOUT));
@@ -541,25 +464,80 @@ MODULE_DEVICE_TABLE (pci, i801_ids);
static int __devinit i801_probe(struct pci_dev *dev, const struct pci_device_id *id)
{
+ unsigned char temp;
+ int err;
+
+ I801_dev = dev;
+ if ((dev->device == PCI_DEVICE_ID_INTEL_82801DB_3) ||
+ (dev->device == PCI_DEVICE_ID_INTEL_82801EB_3) ||
+ (dev->device == PCI_DEVICE_ID_INTEL_ESB_4))
+ isich4 = 1;
+ else
+ isich4 = 0;
- if (i801_setup(dev)) {
- dev_warn(&dev->dev,
- "I801 not detected, module not inserted.\n");
- return -ENODEV;
+ err = pci_enable_device(dev);
+ if (err) {
+ dev_err(&dev->dev, "Failed to enable SMBus PCI device (%d)\n",
+ err);
+ goto exit;
}
+ /* Determine the address of the SMBus area */
+ i801_smba = pci_resource_start(dev, SMBBAR);
+ if (!i801_smba) {
+ dev_err(&dev->dev, "SMBus base address uninitialized, "
+ "upgrade BIOS\n");
+ err = -ENODEV;
+ goto exit;
+ }
+
+ err = pci_request_region(dev, SMBBAR, i801_driver.name);
+ if (err) {
+ dev_err(&dev->dev, "Failed to request SMBus region "
+ "0x%lx-0x%Lx\n", i801_smba,
+ (unsigned long long)pci_resource_end(dev, SMBBAR));
+ goto exit;
+ }
+
+ pci_read_config_byte(I801_dev, SMBHSTCFG, &temp);
+ temp &= ~SMBHSTCFG_I2C_EN; /* SMBus timing */
+ if (!(temp & SMBHSTCFG_HST_EN)) {
+ dev_info(&dev->dev, "Enabling SMBus device\n");
+ temp |= SMBHSTCFG_HST_EN;
+ }
+ pci_write_config_byte(I801_dev, SMBHSTCFG, temp);
+
+ if (temp & SMBHSTCFG_SMB_SMI_EN)
+ dev_dbg(&dev->dev, "SMBus using interrupt SMI#\n");
+ else
+ dev_dbg(&dev->dev, "SMBus using PCI Interrupt\n");
+
/* set up the driverfs linkage to our parent device */
i801_adapter.dev.parent = &dev->dev;
snprintf(i801_adapter.name, I2C_NAME_SIZE,
- "SMBus I801 adapter at %04x", i801_smba);
- return i2c_add_adapter(&i801_adapter);
+ "SMBus I801 adapter at %04lx", i801_smba);
+ err = i2c_add_adapter(&i801_adapter);
+ if (err) {
+ dev_err(&dev->dev, "Failed to add SMBus adapter\n");
+ goto exit_release;
+ }
+ return 0;
+
+exit_release:
+ pci_release_region(dev, SMBBAR);
+exit:
+ return err;
}
static void __devexit i801_remove(struct pci_dev *dev)
{
i2c_del_adapter(&i801_adapter);
- release_region(i801_smba, (isich4 ? 16 : 8));
+ pci_release_region(dev, SMBBAR);
+ /*
+ * do not call pci_disable_device(dev) since it can cause hard hangs on
+ * some systems during power-off (eg. Fujitsu-Siemens Lifebook E8010)
+ */
}
static struct pci_driver i801_driver = {
generated by cgit v1.2.3-70-g09d2 (git 2.46.0) at 2024-11-22 02:14:31 +0000