PCI: add OBFF enable/disable support

OBFF (optimized buffer flush/fill), where supported, can help improve
energy efficiency by giving devices information about when interrupts
and other activity will have a reduced power impact.  It requires
support from both the device and system (i.e. not only does the device
need to respond to OBFF messages, but the platform must be capable of
generating and routing them to the end point).

Signed-off-by: Jesse Barnes <jbarnes@virtuousgeek.org>

1 files changed, 6 insertions, 0 deletions

diff --git a/include/linux/pci_regs.h b/include/linux/pci_regs.h
index d9acf9b99814..aa420261843d 100644
--- a/include/linux/pci_regs.h
+++ b/include/linux/pci_regs.h
@@ -508,10 +508,16 @@
 #define PCI_EXP_RTSTA_PENDING   0x20000 /* PME pending */
 #define PCI_EXP_DEVCAP2         36      /* Device Capabilities 2 */
 #define  PCI_EXP_DEVCAP2_ARI    0x20    /* Alternative Routing-ID */
+#define  PCI_EXP_OBFF_MASK      0xc0000 /* OBFF support mechanism */
+#define  PCI_EXP_OBFF_MSG       0x40000 /* New message signaling */
+#define  PCI_EXP_OBFF_WAKE      0x80000 /* Re-use WAKE# for OBFF */
 #define PCI_EXP_DEVCTL2         40      /* Device Control 2 */
 #define  PCI_EXP_DEVCTL2_ARI    0x20    /* Alternative Routing-ID */
 #define  PCI_EXP_IDO_REQ_EN     0x100   /* ID-based ordering request enable */
 #define  PCI_EXP_IDO_CMP_EN     0x200   /* ID-based ordering completion enable */
+#define  PCI_EXP_OBFF_MSGA_EN   0x2000  /* OBFF enable with Message type A */
+#define  PCI_EXP_OBFF_MSGB_EN   0x4000  /* OBFF enable with Message type B */
+#define  PCI_EXP_OBFF_WAKE_EN   0x6000  /* OBFF using WAKE# signaling */
 #define PCI_EXP_LNKCTL2         48      /* Link Control 2 */
 #define PCI_EXP_SLTCTL2         56      /* Slot Control 2 */