device/pci: Add MSI-X helper functions

Basic PCI MSI-X table helper functions.
Imported from GNU/Linux kernel PCI subsystem.

To be used on Cavium to configure MSI-X tables.

Change-Id: I94413712e7986efd17e6b11ba59f6eb390384c8c
Signed-off-by: Patrick Rudolph <patrick.rudolph@9elements.com>
Reviewed-on: https://review.coreboot.org/26329
Reviewed-by: Philipp Deppenwiese <zaolin.daisuki@gmail.com>
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>

src/include/device/pci.h

@@ -56,6 +56,20 @@ struct pci_driver {
 	const unsigned short *devices;
 };
 
+struct msix_entry {
+	union {
+		struct {
+			u32 lower_addr;
+			u32 upper_addr;
+		};
+		struct {
+			u64 addr;
+		};
+	};
+	u32 data;
+	u32 vec_control;
+};
+
 #ifdef __SIMPLE_DEVICE__
 #define __pci_driver __attribute__((unused))
 #else
@@ -104,6 +118,10 @@ void pci_assign_irqs(unsigned int bus, unsigned int slot,
 const char *get_pci_class_name(struct device *dev);
 const char *get_pci_subclass_name(struct device *dev);
 
+size_t pci_msix_table_size(struct device *dev);
+int pci_msix_table_bar(struct device *dev, u32 *offset, u8 *idx);
+struct msix_entry *pci_msix_get_table(struct device *dev);
+
 #define PCI_IO_BRIDGE_ALIGN 4096
 #define PCI_MEM_BRIDGE_ALIGN (1024*1024)
 

src/include/device/pci_def.h

@@ -292,6 +292,18 @@
 #define PCI_MSI_DATA_64		12	/* 16 bits of data for 64-bit devices */
 #define PCI_MSI_MASK_BIT	16	/* Mask bits register */
 
+/* MSI-X registers */
+#define PCI_MSIX_FLAGS		2
+#define  PCI_MSIX_FLAGS_QSIZE	0x7FF	/* table size */
+#define  PCI_MSIX_FLAGS_MASKALL	0x4000	/* Mask all vectors for this function */
+#define  PCI_MSIX_FLAGS_ENABLE	0x8000	/* MSI-X enable */
+#define PCI_MSIX_TABLE		4	/* Table offset */
+#define PCI_MSIX_PBA		8	/* Pending Bit Array offset */
+#define  PCI_MSIX_PBA_BIR	0x7	/* BAR index */
+#define  PCI_MSIX_PBA_OFFSET	~0x7	/* Offset into specified BAR */
+#define PCI_CAP_MSIX_SIZEOF	12	/* size of MSIX registers */
+
+
 /* CompactPCI Hotswap Register */
 
 #define PCI_CHSWP_CSR		2	/* Control and Status Register */