[PATCH v5 1/5] PCI: Add INTx Mechanism Messages macros

Frank Li
2024-03-19T16:07:25Z

From: Yoshihiro Shimoda <yoshihiro.shimoda.uh@renesas.com>

Add "Message Routing" and "INTx Mechanism Messages" macros to enable
a PCIe driver to send messages for INTx Interrupt Signaling.

The "Message Routing" is in the section 2.2.8, and the "INTx Mechanism
Messages" is in the section 2.2.8.1 on the PCI Express Base Specification,
Rev 6.1.

Signed-off-by: Yoshihiro Shimoda <yoshihiro.shimoda.uh@renesas.com>
Reviewed-by: Serge Semin <fancer.lancer@gmail.com>
Reviewed-by: Manivannan Sadhasivam <manivannan.sadhasivam@linaro.org>
Acked-by: Bjorn Helgaas <bhelgaas@google.com>
Signed-off-by: Frank Li <Frank.Li@nxp.com>
---
drivers/pci/pci.h | 18 ++++++++++++++++++
1 file changed, 18 insertions(+)

diff --git a/drivers/pci/pci.h b/drivers/pci/pci.h
index 2336a8d1edab2..ffd066c15f3bb 100644
--- a/drivers/pci/pci.h
+++ b/drivers/pci/pci.h
@@ -22,6 +22,24 @@
*/
#define PCIE_PME_TO_L2_TIMEOUT_US 10000

+/* Message Routing (r[2:0]) See: PCIe r6.0, sec 2.2.8 */
+#define PCIE_MSG_TYPE_R_RC 0
+#define PCIE_MSG_TYPE_R_ADDR 1
+#define PCIE_MSG_TYPE_R_ID 2
+#define PCIE_MSG_TYPE_R_BC 3
+#define PCIE_MSG_TYPE_R_LOCAL 4
+#define PCIE_MSG_TYPE_R_GATHER 5
+
+/* INTx Mechanism Messages See: PCIe r6.0, sec 2.2.8.1 */
+#define PCIE_MSG_CODE_ASSERT_INTA 0x20
+#define PCIE_MSG_CODE_ASSERT_INTB 0x21
+#define PCIE_MSG_CODE_ASSERT_INTC 0x22
+#define PCIE_MSG_CODE_ASSERT_INTD 0x23
+#define PCIE_MSG_CODE_DEASSERT_INTA 0x24
+#define PCIE_MSG_CODE_DEASSERT_INTB 0x25
+#define PCIE_MSG_CODE_DEASSERT_INTC 0x26
+#define PCIE_MSG_CODE_DEASSERT_INTD 0x27
+
extern const unsigned char pcie_link_speed[];
extern bool pci_early_dump;

--
2.34.1