device/pci_ops: Reuse romstage PCI config for ramstage

By changing the signatures we do not need to define
PCI config accessors separately for ramstage.

Change-Id: I9364cb34fe8127972c772516a0a0b1d281c5ed00
Signed-off-by: Kyösti Mälkki <kyosti.malkki@gmail.com>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/31685
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Nico Huber <nico.h@gmx.de>

3 files changed, 39 insertions, 19 deletions

diff --git a/src/include/device/pci.h b/src/include/device/pci.h
index 2cfcb60244..14c4693459 100644
--- a/src/include/device/pci.h
+++ b/src/include/device/pci.h
@@ -35,14 +35,17 @@ struct pci_operations {
 
 /* Common pci bus operations */
 struct pci_bus_operations {
-	uint8_t   (*read8)(const struct device *dev, uint16_t reg);
-	uint16_t (*read16)(const struct device *dev, uint16_t reg);
-	uint32_t (*read32)(const struct device *dev, uint16_t reg);
-	void     (*write8)(const struct device *dev, uint16_t reg, uint8_t val);
-	void    (*write16)(const struct device *dev, uint16_t reg, uint16_t val);
-	void    (*write32)(const struct device *dev, uint16_t reg, uint32_t val);
+	uint8_t   (*read8)(pci_devfn_t dev, uint16_t reg);
+	uint16_t (*read16)(pci_devfn_t dev, uint16_t reg);
+	uint32_t (*read32)(pci_devfn_t dev, uint16_t reg);
+	void     (*write8)(pci_devfn_t dev, uint16_t reg, uint8_t val);
+	void    (*write16)(pci_devfn_t dev, uint16_t reg, uint16_t val);
+	void    (*write32)(pci_devfn_t dev, uint16_t reg, uint32_t val);
 };
 
+// FIXME: Needs complete pci_bus_operations
+#include <device/pci_ops.h>
+
 struct pci_driver {
 	const struct device_operations *ops;
 	unsigned short vendor;
diff --git a/src/include/device/pci_ops.h b/src/include/device/pci_ops.h
index 82f96584de..bb77754cb6 100644
--- a/src/include/device/pci_ops.h
+++ b/src/include/device/pci_ops.h
@@ -48,52 +48,58 @@ static __always_inline const struct pci_bus_operations *pci_bus_ops(void)
 
 void __noreturn pcidev_die(void);
 
-static __always_inline void pcidev_assert(const struct device *dev)
+static __always_inline pci_devfn_t pcidev_bdf(const struct device *dev)
+{
+	return (dev->path.pci.devfn << 12) | (dev->bus->secondary << 20);
+}
+
+static __always_inline pci_devfn_t pcidev_assert(const struct device *dev)
 {
 	if (!dev)
 		pcidev_die();
+	return pcidev_bdf(dev);
 }
 
 static __always_inline
 u8 pci_read_config8(const struct device *dev, u16 reg)
 {
-	pcidev_assert(dev);
-	return pci_bus_ops()->read8(dev, reg);
+	pci_devfn_t bdf = PCI_BDF(dev);
+	return pci_bus_ops()->read8(bdf, reg);
 }
 
 static __always_inline
 u16 pci_read_config16(const struct device *dev, u16 reg)
 {
-	pcidev_assert(dev);
-	return pci_bus_ops()->read16(dev, reg);
+	pci_devfn_t bdf = PCI_BDF(dev);
+	return pci_bus_ops()->read16(bdf, reg);
 }
 
 static __always_inline
 u32 pci_read_config32(const struct device *dev, u16 reg)
 {
-	pcidev_assert(dev);
-	return pci_bus_ops()->read32(dev, reg);
+	pci_devfn_t bdf = PCI_BDF(dev);
+	return pci_bus_ops()->read32(bdf, reg);
 }
 
 static __always_inline
 void pci_write_config8(const struct device *dev, u16 reg, u8 val)
 {
-	pcidev_assert(dev);
-	pci_bus_ops()->write8(dev, reg, val);
+	pci_devfn_t bdf = PCI_BDF(dev);
+	pci_bus_ops()->write8(bdf, reg, val);
 }
 
 static __always_inline
 void pci_write_config16(const struct device *dev, u16 reg, u16 val)
 {
-	pcidev_assert(dev);
-	pci_bus_ops()->write16(dev, reg, val);
+	pci_devfn_t bdf = PCI_BDF(dev);
+	pci_bus_ops()->write16(bdf, reg, val);
 }
 
 static __always_inline
 void pci_write_config32(const struct device *dev, u16 reg, u32 val)
 {
-	pcidev_assert(dev);
-	pci_bus_ops()->write32(dev, reg, val);
+	pci_devfn_t bdf = PCI_BDF(dev);
+	pci_bus_ops()->write32(bdf, reg, val);
 }
 
 #endif
diff --git a/src/include/device/pci_type.h b/src/include/device/pci_type.h
index 3f72c5f167..27d35589cc 100644
--- a/src/include/device/pci_type.h
+++ b/src/include/device/pci_type.h
@@ -25,4 +25,15 @@ typedef u32 pci_devfn_t;
 
 #define PCI_DEV_INVALID (0xffffffffU)
 
+#if 1
+/* FIXME: For most of the time in ramstage, we get valid device pointer
+ * from calling the driver entry points. The assert should only be used
+ * with searches like pcidev_behind(), and only if caller does not make
+ * the check themselves.
+ */
+#define PCI_BDF(dev) pcidev_assert((dev))
+#else
+#define PCI_BDF(dev) pcidev_bdf((dev))
+#endif
+
 #endif /* DEVICE_PCI_TYPE_H */