add more pci defines and pci_pcie_cap()/pcie_capability_read_dword()

diff --git a/sys/dev/pci/drm/drm_linux.h b/sys/dev/pci/drm/drm_linux.h
index ad6ed22..87b11a0 100644 (file)
--- a/sys/dev/pci/drm/drm_linux.h
+++ b/sys/dev/pci/drm/drm_linux.h
@@ -1,4 +1,4 @@
-/*     $OpenBSD: drm_linux.h,v 1.79 2018/01/30 09:05:23 jsg Exp $      */
+/*     $OpenBSD: drm_linux.h,v 1.80 2018/01/30 09:57:58 jsg Exp $      */
 /*
  * Copyright (c) 2013, 2014, 2015 Mark Kettenis
  * Copyright (c) 2017 Martin Pieuchot
@@ -1455,6 +1455,7 @@ struct pci_dev {
 };
 #define PCI_ANY_ID (uint16_t) (~0U)
 
+#define PCI_VENDOR_ID_APPLE    PCI_VENDOR_APPLE
 #define PCI_VENDOR_ID_ASUSTEK  PCI_VENDOR_ASUSTEK
 #define PCI_VENDOR_ID_ATI      PCI_VENDOR_ATI
 #define PCI_VENDOR_ID_DELL     PCI_VENDOR_DELL
@@ -1472,6 +1473,13 @@ struct pci_dev {
 
 #define pci_dev_put(x)
 
+#define PCI_EXP_DEVSTA         0x0a
+#define PCI_EXP_DEVSTA_TRPND   0x0020
+#define PCI_EXP_LNKCAP         0x0c
+#define PCI_EXP_LNKCAP_CLKPM   0x00040000
+#define PCI_EXP_LNKCTL         0x10
+#define PCI_EXP_LNKCTL_HAWD    0x0200
+#define PCI_EXP_LNKCTL2                0x30
 
 static inline int
 pci_read_config_dword(struct pci_dev *pdev, int reg, u32 *val)
@@ -1557,6 +1565,29 @@ pci_bus_read_config_byte(struct pci_bus *bus, unsigned int devfn,
        return 0;
 }
 
+static inline int
+pci_pcie_cap(struct pci_dev *pdev)
+{
+       int pos;
+       if (!pci_get_capability(pdev->pc, pdev->tag, PCI_CAP_PCIEXPRESS,
+           &pos, NULL))
+               return -EINVAL;
+       return pos;
+}
+
+static inline int
+pcie_capability_read_dword(struct pci_dev *pdev, int off, u32 *val)
+{
+       int pos;
+       if (!pci_get_capability(pdev->pc, pdev->tag, PCI_CAP_PCIEXPRESS,
+           &pos, NULL)) {
+               *val = 0;
+               return -EINVAL;
+       }
+       *val = pci_conf_read(pdev->pc, pdev->tag, pos + off);
+       return 0;
+}
+
 #define pci_set_master(x)
 #define pci_clear_master(x)