cam: Move bus_dmamap_load_ccb into cam.c.

This routine is specific to CAM and no longer assumes any internal
bus_dma knowledge as it is simple wrapper around bus_dmamap_load_mem.

Fixes:		60381fd1ee memdesc: Retire MEMDESC_CCB.
Reviewed by:	kib
Differential Revision:	https://reviews.freebsd.org/D41058

sys/cam/cam.c

@@ -52,6 +52,7 @@ __FBSDID("$FreeBSD$");
 
 #ifdef _KERNEL
 #include <sys/libkern.h>
+#include <machine/bus.h>
 #include <cam/cam_queue.h>
 #include <cam/cam_xpt.h>
 
@@ -642,4 +643,23 @@ memdesc_ccb(union ccb *ccb)
 		panic("%s: flags 0x%X unimplemented", __func__, ccb_h->flags);
 	}
 }
+
+int
+bus_dmamap_load_ccb(bus_dma_tag_t dmat, bus_dmamap_t map, union ccb *ccb,
+		    bus_dmamap_callback_t *callback, void *callback_arg,
+		    int flags)
+{
+	struct ccb_hdr *ccb_h;
+	struct memdesc mem;
+
+	ccb_h = &ccb->ccb_h;
+	if ((ccb_h->flags & CAM_DIR_MASK) == CAM_DIR_NONE) {
+		callback(callback_arg, NULL, 0, 0);
+		return (0);
+	}
+
+	mem = memdesc_ccb(ccb);
+	return (bus_dmamap_load_mem(dmat, map, &mem, callback, callback_arg,
+	    flags));
+}
 #endif

sys/kern/subr_bus_dma.c

@@ -449,25 +449,6 @@ bus_dmamap_load_uio(bus_dma_tag_t dmat, bus_dmamap_t map, struct uio *uio,
 	return (error);
 }
 
-int
-bus_dmamap_load_ccb(bus_dma_tag_t dmat, bus_dmamap_t map, union ccb *ccb,
-		    bus_dmamap_callback_t *callback, void *callback_arg,
-		    int flags)
-{
-	struct ccb_hdr *ccb_h;
-	struct memdesc mem;
-
-	ccb_h = &ccb->ccb_h;
-	if ((ccb_h->flags & CAM_DIR_MASK) == CAM_DIR_NONE) {
-		callback(callback_arg, NULL, 0, 0);
-		return (0);
-	}
-
-	mem = memdesc_ccb(ccb);
-	return (bus_dmamap_load_mem(dmat, map, &mem, callback, callback_arg,
-	    flags));
-}
-
 int
 bus_dmamap_load_bio(bus_dma_tag_t dmat, bus_dmamap_t map, struct bio *bio,
 		    bus_dmamap_callback_t *callback, void *callback_arg,