include/linux/i7300_idle.h

   1 /* SPDX-License-Identifier: GPL-2.0 */
   2
   3 #ifndef I7300_IDLE_H
   4 #define I7300_IDLE_H
   5
   6 #include <linux/pci.h>
   7
   8 /*
   9  * I/O AT controls (PCI bus 0 device 8 function 0)
  10  * DIMM controls (PCI bus 0 device 16 function 1)
  11  */
  12 #define IOAT_BUS 0
  13 #define IOAT_DEVFN PCI_DEVFN(8, 0)
  14 #define MEMCTL_BUS 0
  15 #define MEMCTL_DEVFN PCI_DEVFN(16, 1)
  16
  17 struct fbd_ioat {
  18         unsigned int vendor;
  19         unsigned int ioat_dev;
  20         unsigned int enabled;
  21 };
  22
  23 /*
  24  * The i5000 chip-set has the same hooks as the i7300
  25  * but it is not enabled by default and must be manually
  26  * manually enabled with "forceload=1" because it is
  27  * only lightly validated.
  28  */
  29
  30 static const struct fbd_ioat fbd_ioat_list[] = {
  31         {PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_IOAT_CNB, 1},
  32         {PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_IOAT, 0},
  33         {0, 0}
  34 };
  35
  36 /* table of devices that work with this driver */
  37 static const struct pci_device_id pci_tbl[] = {
  38         { PCI_DEVICE(PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_FBD_CNB) },
  39         { PCI_DEVICE(PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_5000_ERR) },
  40         { } /* Terminating entry */
  41 };
  42
  43 /* Check for known platforms with I/O-AT */
  44 static inline int i7300_idle_platform_probe(struct pci_dev **fbd_dev,
  45                                                 struct pci_dev **ioat_dev,
  46                                                 int enable_all)
  47 {
  48         int i;
  49         struct pci_dev *memdev, *dmadev;
  50
  51         memdev = pci_get_bus_and_slot(MEMCTL_BUS, MEMCTL_DEVFN);
  52         if (!memdev)
  53                 return -ENODEV;
  54
  55         for (i = 0; pci_tbl[i].vendor != 0; i++) {
  56                 if (memdev->vendor == pci_tbl[i].vendor &&
  57                     memdev->device == pci_tbl[i].device) {
  58                         break;
  59                 }
  60         }
  61         if (pci_tbl[i].vendor == 0)
  62                 return -ENODEV;
  63
  64         dmadev = pci_get_bus_and_slot(IOAT_BUS, IOAT_DEVFN);
  65         if (!dmadev)
  66                 return -ENODEV;
  67
  68         for (i = 0; fbd_ioat_list[i].vendor != 0; i++) {
  69                 if (dmadev->vendor == fbd_ioat_list[i].vendor &&
  70                     dmadev->device == fbd_ioat_list[i].ioat_dev) {
  71                         if (!(fbd_ioat_list[i].enabled || enable_all))
  72                                 continue;
  73                         if (fbd_dev)
  74                                 *fbd_dev = memdev;
  75                         if (ioat_dev)
  76                                 *ioat_dev = dmadev;
  77
  78                         return 0;
  79                 }
  80         }
  81         return -ENODEV;
  82 }
  83
  84 #endif