diff options
| -rw-r--r-- | Documentation/i2c/busses/i2c-piix4 | 9 | ||||
| -rw-r--r-- | drivers/i2c/busses/Kconfig | 6 | ||||
| -rw-r--r-- | drivers/i2c/busses/i2c-piix4.c | 71 |
3 files changed, 82 insertions, 4 deletions
diff --git a/Documentation/i2c/busses/i2c-piix4 b/Documentation/i2c/busses/i2c-piix4 index 475bb4ae072..1e6634f54c5 100644 --- a/Documentation/i2c/busses/i2c-piix4 +++ b/Documentation/i2c/busses/i2c-piix4 @@ -8,6 +8,11 @@ Supported adapters: Datasheet: Only available via NDA from ServerWorks * ATI IXP200, IXP300, IXP400, SB600, SB700 and SB800 southbridges Datasheet: Not publicly available + SB700 register reference available at: + http://support.amd.com/us/Embedded_TechDocs/43009_sb7xx_rrg_pub_1.00.pdf + * AMD SP5100 (SB700 derivative found on some server mainboards) + Datasheet: Publicly available at the AMD website + http://support.amd.com/us/Embedded_TechDocs/44413.pdf * AMD Hudson-2 Datasheet: Not publicly available * Standard Microsystems (SMSC) SLC90E66 (Victory66) southbridge @@ -68,6 +73,10 @@ this driver on those mainboards. The ServerWorks Southbridges, the Intel 440MX, and the Victory66 are identical to the PIIX4 in I2C/SMBus support. +The AMD SB700 and SP5100 chipsets implement two PIIX4-compatible SMBus +controllers. If your BIOS initializes the secondary controller, it will +be detected by this driver as an "Auxiliary SMBus Host Controller". + If you own Force CPCI735 motherboard or other OSB4 based systems you may need to change the SMBus Interrupt Select register so the SMBus controller uses the SMI mode. diff --git a/drivers/i2c/busses/Kconfig b/drivers/i2c/busses/Kconfig index 7244c8be606..2e7530a4e7b 100644 --- a/drivers/i2c/busses/Kconfig +++ b/drivers/i2c/busses/Kconfig @@ -133,7 +133,7 @@ config I2C_PIIX4 ATI IXP300 ATI IXP400 ATI SB600 - ATI SB700 + ATI SB700/SP5100 ATI SB800 AMD Hudson-2 Serverworks OSB4 @@ -143,6 +143,10 @@ config I2C_PIIX4 Serverworks HT-1100 SMSC Victory66 + Some AMD chipsets contain two PIIX4-compatible SMBus + controllers. This driver will attempt to use both controllers + on the SB700/SP5100, if they have been initialized by the BIOS. + This driver can also be built as a module. If so, the module will be called i2c-piix4. diff --git a/drivers/i2c/busses/i2c-piix4.c b/drivers/i2c/busses/i2c-piix4.c index 42ed0af10ef..ef511df2c96 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> @@ -293,6 +294,46 @@ static int __devinit piix4_setup_sb800(struct pci_dev *PIIX4_dev, 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(struct i2c_adapter *piix4_adapter) { struct i2c_piix4_adapdata *adapdata = i2c_get_adapdata(piix4_adapter); @@ -497,6 +538,7 @@ 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, @@ -560,10 +602,28 @@ static int __devinit piix4_probe(struct pci_dev *dev, else retval = piix4_setup(dev, id); + /* If no main SMBus found, give up */ if (retval < 0) return retval; - return piix4_add_adapter(dev, retval, &piix4_main_adapter); + /* 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; + + /* 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 0; } static void __devexit piix4_adap_remove(struct i2c_adapter *adap) @@ -584,6 +644,11 @@ static void __devexit piix4_remove(struct pci_dev *dev) piix4_adap_remove(piix4_main_adapter); piix4_main_adapter = NULL; } + + if (piix4_aux_adapter) { + piix4_adap_remove(piix4_aux_adapter); + piix4_aux_adapter = NULL; + } } static struct pci_driver piix4_driver = { |