src/southbridge/intel/i82801cx/i82801cx.c

   1 #include <console/console.h>
   2 #include <device/device.h>
   3 #include <device/pci.h>
   4 #include <device/pci_ids.h>
   5 #include <assert.h>
   6 #include "i82801cx.h"
   7
   8 void i82801cx_enable(device_t dev)
   9 {
  10         unsigned int index = 0;
  11         uint8_t bHasDisableBit = 0;
  12         uint16_t cur_disable_mask, new_disable_mask;
  13
  14 //      all 82801ca devices are in bus 0
  15         unsigned int devfn = PCI_DEVFN(0x1f, 0); // lpc
  16         device_t lpc_dev = dev_find_slot(0, devfn); // 0
  17         if (!lpc_dev)
  18                 return;
  19
  20         // Calculate disable bit position for specified device:function
  21         // NOTE: For ICH-3, only the following devices can be disabled:
  22         //               D31:F1, D31:F3, D31:F5, D31:F6,
  23         //               D29:F0, D29:F1, D29:F2
  24
  25     if (PCI_SLOT(dev->path.pci.devfn) == 31) {
  26         index = PCI_FUNC(dev->path.pci.devfn);
  27
  28                 if ((index == 1) || (index == 3) || (index == 5) || (index == 6))
  29                         bHasDisableBit = 1;
  30
  31     } else if (PCI_SLOT(dev->path.pci.devfn) == 29) {
  32         index = 8 + PCI_FUNC(dev->path.pci.devfn);
  33
  34                 if (PCI_FUNC(dev->path.pci.devfn) < 3)
  35                         bHasDisableBit = 1;
  36     }
  37
  38         if (bHasDisableBit) {
  39                 cur_disable_mask = pci_read_config16(lpc_dev, FUNC_DIS);
  40                 new_disable_mask = cur_disable_mask & ~(1<<index);              // enable it
  41                 if (!dev->enabled) {
  42                         new_disable_mask |= (1<<index);  // disable it
  43                 }
  44                 if (new_disable_mask != cur_disable_mask) {
  45                         pci_write_config16(lpc_dev, FUNC_DIS, new_disable_mask);
  46                 }
  47         }
  48 }
  49
  50 struct chip_operations southbridge_intel_i82801cx_ops = {
  51         CHIP_NAME("Intel ICH3 (82801Cx) Series Southbridge")
  52         .enable_dev = i82801cx_enable,
  53 };