diff options
Diffstat (limited to 'src/southbridge/intel/i82801ax/i82801ax.c')
| -rw-r--r-- | src/southbridge/intel/i82801ax/i82801ax.c | 37 |
1 files changed, 10 insertions, 27 deletions
diff --git a/src/southbridge/intel/i82801ax/i82801ax.c b/src/southbridge/intel/i82801ax/i82801ax.c index ea4cda67eb6e..7f4c7317c28d 100644 --- a/src/southbridge/intel/i82801ax/i82801ax.c +++ b/src/southbridge/intel/i82801ax/i82801ax.c @@ -27,38 +27,21 @@ void i82801ax_enable(device_t dev) { - unsigned int index = 0; - uint16_t cur_disable_mask, new_disable_mask; + u16 reg16, index; + device_t lpc_dev; - /* All 82801xx devices should be on bus 0. */ - unsigned int devfn = PCI_DEVFN(0x1f, 0); // LPC - device_t lpc_dev = dev_find_slot(0, devfn); // 0 + /* Search for the 82801AA/AB LPC device (D31:F0) on PCI bus 0. */ + lpc_dev = dev_find_slot(0, PCI_DEVFN(0x1f, 0)); if (!lpc_dev) return; - /* We're going to assume, perhaps incorrectly, that if a function - * exists it can be disabled. Workarounds for ICH variants that don't - * follow this should be done by checking the device ID. - */ - if (PCI_SLOT(dev->path.pci.devfn) == 31) { - index = PCI_FUNC(dev->path.pci.devfn); - } else if (PCI_SLOT(dev->path.pci.devfn) == 29) { - index = 8 + PCI_FUNC(dev->path.pci.devfn); - } + index = PCI_FUNC(dev->path.pci.devfn); - /* Function 0 is a bit of an exception. */ - if (index == 0) { - index = 14; - } - - cur_disable_mask = pci_read_config16(lpc_dev, FUNC_DIS); - new_disable_mask = cur_disable_mask & ~(1 << index); /* Enable it. */ - if (!dev->enabled) { - new_disable_mask |= (1 << index); /* Disable it, if desired. */ - } - if (new_disable_mask != cur_disable_mask) { - pci_write_config16(lpc_dev, FUNC_DIS, new_disable_mask); - } + reg16 = pci_read_config16(lpc_dev, FUNC_DIS); + reg16 &= ~(1 << index); /* Enable device. */ + if (!dev->enabled) + reg16 |= (1 << index); /* Disable device, if desired. */ + pci_write_config16(lpc_dev, FUNC_DIS, reg16); } struct chip_operations southbridge_intel_i82801ax_ops = { |