diff options
author | Andrew Armenia <andrew@asquaredlabs.com> | 2012-07-24 14:13:57 +0200 |
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committer | Jean Delvare <khali@endymion.delvare> | 2012-07-24 14:13:57 +0200 |
commit | 2a2f7404a1946be62290292ca5d6438c4b50567f (patch) | |
tree | 79c458c163f378de8704bb7ea7529d3957f39c56 /drivers/i2c/busses/i2c-piix4.c | |
parent | e154bf6fbfc167426ee938111a5ffa36bd8541a1 (diff) | |
download | linux-2a2f7404a1946be62290292ca5d6438c4b50567f.tar.bz2 |
i2c-piix4: Support AMD auxiliary SMBus controller
Some AMD chipsets, such as the SP5100, have an auxiliary SMBus
controller with a second set of registers. This patch adds
support for this auxiliary controller.
Tested on ASUS KCMA-D8 motherboard.
Signed-off-by: Andrew Armenia <andrew@asquaredlabs.com>
Signed-off-by: Jean Delvare <khali@linux-fr.org>
Diffstat (limited to 'drivers/i2c/busses/i2c-piix4.c')
-rw-r--r-- | drivers/i2c/busses/i2c-piix4.c | 71 |
1 files changed, 68 insertions, 3 deletions
diff --git a/drivers/i2c/busses/i2c-piix4.c b/drivers/i2c/busses/i2c-piix4.c index 42ed0af10efd..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> @@ -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 = { |