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path: root/drivers/i2c/busses/i2c-piix4.c
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Diffstat (limited to 'drivers/i2c/busses/i2c-piix4.c')
-rw-r--r--drivers/i2c/busses/i2c-piix4.c209
1 files changed, 156 insertions, 53 deletions
diff --git a/drivers/i2c/busses/i2c-piix4.c b/drivers/i2c/busses/i2c-piix4.c
index c14d48dd601a..ef511df2c965 100644
--- a/drivers/i2c/busses/i2c-piix4.c
+++ b/drivers/i2c/busses/i2c-piix4.c
@@ -21,11 +21,12 @@
Supports:
Intel PIIX4, 440MX
Serverworks OSB4, CSB5, CSB6, HT-1000, HT-1100
- ATI IXP200, IXP300, IXP400, SB600, SB700, SB800
+ ATI IXP200, IXP300, IXP400, SB600, SB700/SP5100, SB800
AMD Hudson-2
SMSC Victory66
- Note: we assume there can only be one device, with one SMBus interface.
+ Note: we assume there can only be one device, with one or more
+ SMBus interfaces.
*/
#include <linux/module.h>
@@ -94,10 +95,8 @@ MODULE_PARM_DESC(force_addr,
"Forcibly enable the PIIX4 at the given address. "
"EXTREMELY DANGEROUS!");
-static unsigned short piix4_smba;
static int srvrworks_csb5_delay;
static struct pci_driver piix4_driver;
-static struct i2c_adapter piix4_adapter;
static struct dmi_system_id __devinitdata piix4_dmi_blacklist[] = {
{
@@ -127,10 +126,15 @@ static struct dmi_system_id __devinitdata piix4_dmi_ibm[] = {
{ },
};
+struct i2c_piix4_adapdata {
+ unsigned short smba;
+};
+
static int __devinit piix4_setup(struct pci_dev *PIIX4_dev,
const struct pci_device_id *id)
{
unsigned char temp;
+ unsigned short piix4_smba;
if ((PIIX4_dev->vendor == PCI_VENDOR_ID_SERVERWORKS) &&
(PIIX4_dev->device == PCI_DEVICE_ID_SERVERWORKS_CSB5))
@@ -206,7 +210,6 @@ static int __devinit piix4_setup(struct pci_dev *PIIX4_dev,
dev_err(&PIIX4_dev->dev,
"Host SMBus controller not enabled!\n");
release_region(piix4_smba, SMBIOSIZE);
- piix4_smba = 0;
return -ENODEV;
}
}
@@ -224,12 +227,13 @@ static int __devinit piix4_setup(struct pci_dev *PIIX4_dev,
"SMBus Host Controller at 0x%x, revision %d\n",
piix4_smba, temp);
- return 0;
+ return piix4_smba;
}
static int __devinit piix4_setup_sb800(struct pci_dev *PIIX4_dev,
const struct pci_device_id *id)
{
+ unsigned short piix4_smba;
unsigned short smba_idx = 0xcd6;
u8 smba_en_lo, smba_en_hi, i2ccfg, i2ccfg_offset = 0x10, smb_en = 0x2c;
@@ -273,7 +277,6 @@ static int __devinit piix4_setup_sb800(struct pci_dev *PIIX4_dev,
dev_err(&PIIX4_dev->dev, "SMBus I2C bus config region "
"0x%x already in use!\n", piix4_smba + i2ccfg_offset);
release_region(piix4_smba, SMBIOSIZE);
- piix4_smba = 0;
return -EBUSY;
}
i2ccfg = inb_p(piix4_smba + i2ccfg_offset);
@@ -288,30 +291,72 @@ static int __devinit piix4_setup_sb800(struct pci_dev *PIIX4_dev,
"SMBus Host Controller at 0x%x, revision %d\n",
piix4_smba, i2ccfg >> 4);
- return 0;
+ return piix4_smba;
+}
+
+static int __devinit piix4_setup_aux(struct pci_dev *PIIX4_dev,
+ const struct pci_device_id *id,
+ unsigned short base_reg_addr)
+{
+ /* Set up auxiliary SMBus controllers found on some
+ * AMD chipsets e.g. SP5100 (SB700 derivative) */
+
+ unsigned short piix4_smba;
+
+ /* Read address of auxiliary SMBus controller */
+ pci_read_config_word(PIIX4_dev, base_reg_addr, &piix4_smba);
+ if ((piix4_smba & 1) == 0) {
+ dev_dbg(&PIIX4_dev->dev,
+ "Auxiliary SMBus controller not enabled\n");
+ return -ENODEV;
+ }
+
+ piix4_smba &= 0xfff0;
+ if (piix4_smba == 0) {
+ dev_dbg(&PIIX4_dev->dev,
+ "Auxiliary SMBus base address uninitialized\n");
+ return -ENODEV;
+ }
+
+ if (acpi_check_region(piix4_smba, SMBIOSIZE, piix4_driver.name))
+ return -ENODEV;
+
+ if (!request_region(piix4_smba, SMBIOSIZE, piix4_driver.name)) {
+ dev_err(&PIIX4_dev->dev, "Auxiliary SMBus region 0x%x "
+ "already in use!\n", piix4_smba);
+ return -EBUSY;
+ }
+
+ dev_info(&PIIX4_dev->dev,
+ "Auxiliary SMBus Host Controller at 0x%x\n",
+ piix4_smba);
+
+ return piix4_smba;
}
-static int piix4_transaction(void)
+static int piix4_transaction(struct i2c_adapter *piix4_adapter)
{
+ struct i2c_piix4_adapdata *adapdata = i2c_get_adapdata(piix4_adapter);
+ unsigned short piix4_smba = adapdata->smba;
int temp;
int result = 0;
int timeout = 0;
- dev_dbg(&piix4_adapter.dev, "Transaction (pre): CNT=%02x, CMD=%02x, "
+ dev_dbg(&piix4_adapter->dev, "Transaction (pre): CNT=%02x, CMD=%02x, "
"ADD=%02x, DAT0=%02x, DAT1=%02x\n", inb_p(SMBHSTCNT),
inb_p(SMBHSTCMD), inb_p(SMBHSTADD), inb_p(SMBHSTDAT0),
inb_p(SMBHSTDAT1));
/* Make sure the SMBus host is ready to start transmitting */
if ((temp = inb_p(SMBHSTSTS)) != 0x00) {
- dev_dbg(&piix4_adapter.dev, "SMBus busy (%02x). "
+ dev_dbg(&piix4_adapter->dev, "SMBus busy (%02x). "
"Resetting...\n", temp);
outb_p(temp, SMBHSTSTS);
if ((temp = inb_p(SMBHSTSTS)) != 0x00) {
- dev_err(&piix4_adapter.dev, "Failed! (%02x)\n", temp);
+ dev_err(&piix4_adapter->dev, "Failed! (%02x)\n", temp);
return -EBUSY;
} else {
- dev_dbg(&piix4_adapter.dev, "Successful!\n");
+ dev_dbg(&piix4_adapter->dev, "Successful!\n");
}
}
@@ -330,35 +375,35 @@ static int piix4_transaction(void)
/* If the SMBus is still busy, we give up */
if (timeout == MAX_TIMEOUT) {
- dev_err(&piix4_adapter.dev, "SMBus Timeout!\n");
+ dev_err(&piix4_adapter->dev, "SMBus Timeout!\n");
result = -ETIMEDOUT;
}
if (temp & 0x10) {
result = -EIO;
- dev_err(&piix4_adapter.dev, "Error: Failed bus transaction\n");
+ dev_err(&piix4_adapter->dev, "Error: Failed bus transaction\n");
}
if (temp & 0x08) {
result = -EIO;
- dev_dbg(&piix4_adapter.dev, "Bus collision! SMBus may be "
+ dev_dbg(&piix4_adapter->dev, "Bus collision! SMBus may be "
"locked until next hard reset. (sorry!)\n");
/* Clock stops and slave is stuck in mid-transmission */
}
if (temp & 0x04) {
result = -ENXIO;
- dev_dbg(&piix4_adapter.dev, "Error: no response!\n");
+ dev_dbg(&piix4_adapter->dev, "Error: no response!\n");
}
if (inb_p(SMBHSTSTS) != 0x00)
outb_p(inb(SMBHSTSTS), SMBHSTSTS);
if ((temp = inb_p(SMBHSTSTS)) != 0x00) {
- dev_err(&piix4_adapter.dev, "Failed reset at end of "
+ dev_err(&piix4_adapter->dev, "Failed reset at end of "
"transaction (%02x)\n", temp);
}
- dev_dbg(&piix4_adapter.dev, "Transaction (post): CNT=%02x, CMD=%02x, "
+ dev_dbg(&piix4_adapter->dev, "Transaction (post): CNT=%02x, CMD=%02x, "
"ADD=%02x, DAT0=%02x, DAT1=%02x\n", inb_p(SMBHSTCNT),
inb_p(SMBHSTCMD), inb_p(SMBHSTADD), inb_p(SMBHSTDAT0),
inb_p(SMBHSTDAT1));
@@ -370,6 +415,8 @@ static s32 piix4_access(struct i2c_adapter * adap, u16 addr,
unsigned short flags, char read_write,
u8 command, int size, union i2c_smbus_data * data)
{
+ struct i2c_piix4_adapdata *adapdata = i2c_get_adapdata(adap);
+ unsigned short piix4_smba = adapdata->smba;
int i, len;
int status;
@@ -426,7 +473,7 @@ static s32 piix4_access(struct i2c_adapter * adap, u16 addr,
outb_p((size & 0x1C) + (ENABLE_INT9 & 1), SMBHSTCNT);
- status = piix4_transaction();
+ status = piix4_transaction(adap);
if (status)
return status;
@@ -466,12 +513,6 @@ static const struct i2c_algorithm smbus_algorithm = {
.functionality = piix4_func,
};
-static struct i2c_adapter piix4_adapter = {
- .owner = THIS_MODULE,
- .class = I2C_CLASS_HWMON | I2C_CLASS_SPD,
- .algo = &smbus_algorithm,
-};
-
static DEFINE_PCI_DEVICE_TABLE(piix4_ids) = {
{ PCI_DEVICE(PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_82371AB_3) },
{ PCI_DEVICE(PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_82443MX_3) },
@@ -496,6 +537,57 @@ static DEFINE_PCI_DEVICE_TABLE(piix4_ids) = {
MODULE_DEVICE_TABLE (pci, piix4_ids);
+static struct i2c_adapter *piix4_main_adapter;
+static struct i2c_adapter *piix4_aux_adapter;
+
+static int __devinit piix4_add_adapter(struct pci_dev *dev,
+ unsigned short smba,
+ struct i2c_adapter **padap)
+{
+ struct i2c_adapter *adap;
+ struct i2c_piix4_adapdata *adapdata;
+ int retval;
+
+ adap = kzalloc(sizeof(*adap), GFP_KERNEL);
+ if (adap == NULL) {
+ release_region(smba, SMBIOSIZE);
+ return -ENOMEM;
+ }
+
+ adap->owner = THIS_MODULE;
+ adap->class = I2C_CLASS_HWMON | I2C_CLASS_SPD;
+ adap->algo = &smbus_algorithm;
+
+ adapdata = kzalloc(sizeof(*adapdata), GFP_KERNEL);
+ if (adapdata == NULL) {
+ kfree(adap);
+ release_region(smba, SMBIOSIZE);
+ return -ENOMEM;
+ }
+
+ adapdata->smba = smba;
+
+ /* set up the sysfs linkage to our parent device */
+ adap->dev.parent = &dev->dev;
+
+ snprintf(adap->name, sizeof(adap->name),
+ "SMBus PIIX4 adapter at %04x", smba);
+
+ i2c_set_adapdata(adap, adapdata);
+
+ retval = i2c_add_adapter(adap);
+ if (retval) {
+ dev_err(&dev->dev, "Couldn't register adapter!\n");
+ kfree(adapdata);
+ kfree(adap);
+ release_region(smba, SMBIOSIZE);
+ return retval;
+ }
+
+ *padap = adap;
+ return 0;
+}
+
static int __devinit piix4_probe(struct pci_dev *dev,
const struct pci_device_id *id)
{
@@ -510,30 +602,52 @@ static int __devinit piix4_probe(struct pci_dev *dev,
else
retval = piix4_setup(dev, id);
- if (retval)
+ /* If no main SMBus found, give up */
+ if (retval < 0)
return retval;
- /* set up the sysfs linkage to our parent device */
- piix4_adapter.dev.parent = &dev->dev;
-
- snprintf(piix4_adapter.name, sizeof(piix4_adapter.name),
- "SMBus PIIX4 adapter at %04x", piix4_smba);
+ /* Try to register main SMBus adapter, give up if we can't */
+ retval = piix4_add_adapter(dev, retval, &piix4_main_adapter);
+ if (retval < 0)
+ return retval;
- if ((retval = i2c_add_adapter(&piix4_adapter))) {
- dev_err(&dev->dev, "Couldn't register adapter!\n");
- release_region(piix4_smba, SMBIOSIZE);
- piix4_smba = 0;
+ /* Check for auxiliary SMBus on some AMD chipsets */
+ if (dev->vendor == PCI_VENDOR_ID_ATI &&
+ dev->device == PCI_DEVICE_ID_ATI_SBX00_SMBUS &&
+ dev->revision < 0x40) {
+ retval = piix4_setup_aux(dev, id, 0x58);
+ if (retval > 0) {
+ /* Try to add the aux adapter if it exists,
+ * piix4_add_adapter will clean up if this fails */
+ piix4_add_adapter(dev, retval, &piix4_aux_adapter);
+ }
}
- return retval;
+ return 0;
+}
+
+static void __devexit piix4_adap_remove(struct i2c_adapter *adap)
+{
+ struct i2c_piix4_adapdata *adapdata = i2c_get_adapdata(adap);
+
+ if (adapdata->smba) {
+ i2c_del_adapter(adap);
+ release_region(adapdata->smba, SMBIOSIZE);
+ kfree(adapdata);
+ kfree(adap);
+ }
}
static void __devexit piix4_remove(struct pci_dev *dev)
{
- if (piix4_smba) {
- i2c_del_adapter(&piix4_adapter);
- release_region(piix4_smba, SMBIOSIZE);
- piix4_smba = 0;
+ if (piix4_main_adapter) {
+ piix4_adap_remove(piix4_main_adapter);
+ piix4_main_adapter = NULL;
+ }
+
+ if (piix4_aux_adapter) {
+ piix4_adap_remove(piix4_aux_adapter);
+ piix4_aux_adapter = NULL;
}
}
@@ -544,20 +658,9 @@ static struct pci_driver piix4_driver = {
.remove = __devexit_p(piix4_remove),
};
-static int __init i2c_piix4_init(void)
-{
- return pci_register_driver(&piix4_driver);
-}
-
-static void __exit i2c_piix4_exit(void)
-{
- pci_unregister_driver(&piix4_driver);
-}
+module_pci_driver(piix4_driver);
MODULE_AUTHOR("Frodo Looijaard <frodol@dds.nl> and "
"Philip Edelbrock <phil@netroedge.com>");
MODULE_DESCRIPTION("PIIX4 SMBus driver");
MODULE_LICENSE("GPL");
-
-module_init(i2c_piix4_init);
-module_exit(i2c_piix4_exit);