Tweak API to allow separation of bus-scanning and device-probing logic.

src/drivers/bus/eisa.c

@@ -48,37 +48,22 @@ static int fill_eisa_device ( struct eisa_device *eisa ) {
 }
 
 /*
- * Obtain a struct eisa * from a struct dev *
+ * Find an EISA device matching the specified driver
  *
- * If dev has not previously been used for an EISA device scan, blank
- * out struct eisa
  */
-struct eisa_device * eisa_device ( struct dev *dev ) {
-	struct eisa_device *eisa = dev->bus;;
+int find_eisa_device ( struct eisa_device *eisa, struct eisa_driver *driver ) {
+	unsigned int i;
 
+	/* Initialise struct eisa if it's the first time it's been used. */
 	if ( eisa->magic != eisa_magic ) {
 		memset ( eisa, 0, sizeof ( *eisa ) );
 		eisa->magic = eisa_magic;
+		eisa->slot = EISA_MIN_SLOT;
 	}
-	eisa->dev = dev;
-	return eisa;
-}
-
-/*
- * Find an EISA device matching the specified driver
- *
- */
-int find_eisa_device ( struct eisa_device *eisa, struct eisa_driver *driver ) {
-	unsigned int i;
 
 	/* Iterate through all possible EISA slots, starting where we
-	 * left off.  If eisa->slot is zero (which it will be if we
-	 * have a zeroed structure), start from slot EISA_MIN_SLOT,
-	 * since slot 0 doesn't exist.
+	 * left off.
 	 */
-	if ( ! eisa->slot ) {
-		eisa->slot = EISA_MIN_SLOT;
-	}
 	for ( ; eisa->slot <= EISA_MAX_SLOT ; eisa->slot++ ) {
 		/* If we've already used this device, skip it */
 		if ( eisa->already_tried ) {
@@ -102,15 +87,7 @@ int find_eisa_device ( struct eisa_device *eisa, struct eisa_driver *driver ) {
 				      id->name, driver->name,
 				      isa_id_string ( eisa->mfg_id,
 						      eisa->prod_id ) );
-				if ( eisa->dev ) {
-					eisa->dev->name = driver->name;
-					eisa->dev->devid.bus_type
-						= ISA_BUS_TYPE;
-					eisa->dev->devid.vendor_id
-						= eisa->mfg_id;
-					eisa->dev->devid.device_id
-						= eisa->prod_id;
-				}
+				eisa->name = id->name;
 				eisa->already_tried = 1;
 				return 1;
 			}
@@ -122,6 +99,25 @@ int find_eisa_device ( struct eisa_device *eisa, struct eisa_driver *driver ) {
 	return 0;
 }
 
+/*
+ * Find the next EISA device that can be used to boot using the
+ * specified driver.
+ *
+ */
+int find_eisa_boot_device ( struct dev *dev, struct eisa_driver *driver ) {
+	struct eisa_device *eisa = ( struct eisa_device * )dev->bus;
+
+	if ( ! find_eisa_device ( eisa, driver ) )
+		return 0;
+
+	dev->name = eisa->name;
+	dev->devid.bus_type = ISA_BUS_TYPE;
+	dev->devid.vendor_id = eisa->mfg_id;
+	dev->devid.device_id = eisa->prod_id;
+
+	return 1;
+}
+
 /*
  * Reset and enable an EISA device
  *

src/drivers/bus/mca.c

@@ -49,31 +49,20 @@ static int fill_mca_device ( struct mca_device *mca ) {
 }
 
 /*
- * Obtain a struct mca * from a struct dev *
+ * Find an MCA device matching the specified driver
  *
- * If dev has not previously been used for an MCA device scan, blank
- * out struct mca
  */
-struct mca_device * mca_device ( struct dev *dev ) {
-	struct mca_device *mca = dev->bus;
+int find_mca_device ( struct mca_device *mca, struct mca_driver *driver ) {
+	unsigned int i;
 
+	/* Initialise struct mca if it's the first time it's been used. */
 	if ( mca->magic != mca_magic ) {
 		memset ( mca, 0, sizeof ( *mca ) );
 		mca->magic = mca_magic;
 	}
-	mca->dev = dev;
-	return mca;
-}
-
-/*
- * Find an MCA device matching the specified driver
- *
- */
-int find_mca_device ( struct mca_device *mca, struct mca_driver *driver ) {
-	unsigned int i;
 
 	/* Iterate through all possible MCA slots, starting where we
-	 * left off/
+	 * left off
 	 */
 	for ( ; mca->slot < MCA_MAX_SLOT_NR ; mca->slot++ ) {
 		/* If we've already used this device, skip it */
@@ -94,14 +83,7 @@ int find_mca_device ( struct mca_device *mca, struct mca_driver *driver ) {
 			if ( MCA_ID ( mca ) == id->id ) {
 				DBG ( "Device %s (driver %s) matches ID %hx\n",
 				      id->name, driver->name, id->id );
-				if ( mca->dev ) {
-					mca->dev->name = driver->name;
-					mca->dev->devid.bus_type
-						= MCA_BUS_TYPE;
-					mca->dev->devid.vendor_id
-						= GENERIC_MCA_VENDOR;
-					mca->dev->devid.device_id = id->id;
-				}
+				mca->name = id->name;
 				mca->already_tried = 1;
 				return 1;
 			}
@@ -112,3 +94,22 @@ int find_mca_device ( struct mca_device *mca, struct mca_driver *driver ) {
 	mca->slot = 0;
 	return 0;
 }
+
+/*
+ * Find the next MCA device that can be used to boot using the
+ * specified driver.
+ *
+ */
+int find_mca_boot_device ( struct dev *dev, struct mca_driver *driver ) {
+	struct mca_device *mca = ( struct mca_device * )dev->bus;
+
+	if ( ! find_mca_device ( mca, driver ) )
+		return 0;
+
+	dev->name = mca->name;
+	dev->devid.bus_type = MCA_BUS_TYPE;
+	dev->devid.vendor_id = GENERIC_MCA_VENDOR;
+	dev->devid.device_id = MCA_ID ( mca );
+
+	return 1;
+}

src/drivers/bus/pci.c

@@ -109,23 +109,6 @@ void adjust_pci_device ( struct pci_device *pci ) {
 	}
 }
 
-/*
- * Obtain a struct pci * from a struct dev *
- *
- * If dev has not previously been used for a PCI device scan, blank
- * out struct pci
- */
-struct pci_device * pci_device ( struct dev *dev ) {
-	struct pci_device *pci = dev->bus;
-
-	if ( pci->magic != pci_magic ) {
-		memset ( pci, 0, sizeof ( *pci ) );
-		pci->magic = pci_magic;
-	}
-	pci->dev = dev;
-	return pci;
-}
-
 /*
  * Set PCI device to use.
  *
@@ -148,6 +131,12 @@ int find_pci_device ( struct pci_device *pci,
 		      struct pci_driver *driver ) {
 	int i;
 
+	/* Initialise struct pci if it's the first time it's been used. */
+	if ( pci->magic != pci_magic ) {
+		memset ( pci, 0, sizeof ( *pci ) );
+		pci->magic = pci_magic;
+	}
+
 	/* Iterate through all possible PCI bus:dev.fn combinations,
 	 * starting where we left off.
 	 */
@@ -166,19 +155,12 @@ int find_pci_device ( struct pci_device *pci,
 		/* Fix up PCI device */
 		adjust_pci_device ( pci );
 		
-		/* Fill in dev structure, if present */
-		if ( pci->dev ) {
-			pci->dev->name = driver->name;
-			pci->dev->devid.bus_type = PCI_BUS_TYPE;
-			pci->dev->devid.vendor_id = pci->vendor;
-			pci->dev->devid.device_id = pci->dev_id;
-		}
-
 		/* If driver has a class, and class matches, use it */
 		if ( driver->class && 
 		     ( driver->class == pci->class ) ) {
 			DBG ( "Driver %s matches class %hx\n",
 			      driver->name, driver->class );
+			pci->name = driver->name;
 			pci->already_tried = 1;
 			return 1;
 		}
@@ -192,8 +174,7 @@ int find_pci_device ( struct pci_device *pci,
 				DBG ( "Device %s (driver %s) matches "
 				      "ID %hx:%hx\n", id->name, driver->name,
 				      id->vendor, id->dev_id );
-				if ( pci->dev )
-					pci->dev->name = id->name;
+				pci->name = id->name;
 				pci->already_tried = 1;
 				return 1;
 			}
@@ -206,6 +187,25 @@ int find_pci_device ( struct pci_device *pci,
 	return 0;
 }
 
+/*
+ * Find the next PCI device that can be used to boot using the
+ * specified driver.
+ *
+ */
+int find_pci_boot_device ( struct dev *dev, struct pci_driver *driver ) {
+	struct pci_device *pci = ( struct pci_device * )dev->bus;
+
+	if ( ! find_pci_device ( pci, driver ) )
+		return 0;
+
+	dev->name = pci->name;
+	dev->devid.bus_type = PCI_BUS_TYPE;
+	dev->devid.vendor_id = pci->vendor;
+	dev->devid.device_id = pci->dev_id;
+
+	return 1;
+}
+
 /*
  * Find the start of a pci resource.
  */

src/include/eisa.h

@@ -25,10 +25,9 @@
  * A physical EISA device
  *
  */
-struct dev;
 struct eisa_device {
 	char *magic; /* must be first */
-	struct dev *dev;
+	const char *name;
 	unsigned int slot;
 	uint16_t ioaddr;
 	uint16_t mfg_id;
@@ -69,9 +68,10 @@ struct eisa_driver {
  * Functions in eisa.c
  *
  */
-extern struct eisa_device * eisa_device ( struct dev *dev );
 extern int find_eisa_device ( struct eisa_device *eisa,
 			      struct eisa_driver *driver );
+extern int find_eisa_boot_device ( struct dev *dev,
+				   struct eisa_driver *driver );
 extern void enable_eisa_device ( struct eisa_device *eisa );
 
 #endif /* EISA_H */

src/include/mca.h

@@ -26,10 +26,9 @@
  * A physical MCA device
  *
  */
-struct dev;
 struct mca_device {
 	char *magic; /* must be first */
-	struct dev *dev;
+	const char *name;
 	unsigned int slot;
 	unsigned char pos[8];
 	int already_tried;
@@ -69,8 +68,8 @@ struct mca_driver {
  * Functions in mca.c
  *
  */
-extern struct mca_device * mca_device ( struct dev *dev );
 extern int find_mca_device ( struct mca_device *mca,
 			     struct mca_driver *driver );
+extern int find_mca_boot_device ( struct dev *dev, struct mca_driver *driver );
 
 #endif

src/include/pci.h

@@ -236,10 +236,9 @@
  * A physical PCI device
  *
  */
-struct dev;
 struct pci_device {
 	char *			magic; /* must be first */
-	struct dev *		dev;
+	const char *		name;
 	uint32_t		membase;	/* BAR 1 */
 	uint32_t		ioaddr;		/* first IO BAR */
 	uint16_t		vendor, dev_id;
@@ -322,9 +321,9 @@ extern unsigned long pci_bus_base ( struct pci_device *dev );
  * Functions in pci.c
  *
  */
-extern struct pci_device * pci_device ( struct dev *dev );
 extern int find_pci_device ( struct pci_device *pci,
 			     struct pci_driver *driver );
+extern int find_pci_boot_device ( struct dev *dev, struct pci_driver *driver );
 extern void adjust_pci_device ( struct pci_device *pci );
 extern unsigned long pci_bar_start ( struct pci_device *pci,
 				     unsigned int bar );