MFp4: Add support for memory mapped UARTs, but don't add any devices

yet that depend on it because sio(4) needs support for it before it
can be used. There's no reason why zs(4) couldn't attach to puc(4)
in the (near?) future (in principle), so don't make memory mapped I/O
support in sio(4) a precondition for this change.

2 files changed, 18 insertions, 9 deletions

diff --git a/sys/dev/puc/puc.c b/sys/dev/puc/puc.c
index 3bce20b..18d2fba 100644
--- a/sys/dev/puc/puc.c
+++ b/sys/dev/puc/puc.c
@@ -134,7 +134,7 @@ int
 puc_attach(device_t dev, const struct puc_device_description *desc)
 {
 	char *typestr;
-	int bidx, childunit, i, irq_setup, rid;
+	int bidx, childunit, i, irq_setup, rid, type;
 	struct puc_softc *sc;
 	struct puc_device *pdev;
 	struct resource *res;
@@ -183,15 +183,21 @@ puc_attach(device_t dev, const struct puc_device_description *desc)
 
 		if (sc->sc_bar_mappings[bidx].res != NULL)
 			continue;
-		res = bus_alloc_resource(dev, SYS_RES_IOPORT, &rid,
-		    0ul, ~0ul, 1, RF_ACTIVE);
+
+		type = (sc->sc_desc->ports[i].flags & PUC_FLAGS_MEMORY)
+		    ? SYS_RES_MEMORY : SYS_RES_IOPORT;
+
+		res = bus_alloc_resource(dev, type, &rid, 0ul, ~0ul, 1,
+		    RF_ACTIVE);
 		if (res == NULL) {
 			printf("could not get resource\n");
 			continue;
 		}
+		sc->sc_bar_mappings[bidx].type = type;
 		sc->sc_bar_mappings[bidx].res = res;
 #ifdef PUC_DEBUG
-		printf("port rid %d bst %x, start %x, end %x\n", rid,
+		printf("%s rid %d bst %x, start %x, end %x\n",
+		    (type == SYS_RES_MEMORY) ? "memory" : "port", rid,
 		    (u_int)rman_get_bustag(res), (u_int)rman_get_start(res),
 		    (u_int)rman_get_end(res));
 #endif
@@ -229,13 +235,14 @@ puc_attach(device_t dev, const struct puc_device_description *desc)
 		rle = resource_list_find(&pdev->resources, SYS_RES_IRQ, 0);
 		rle->res = sc->irqres;
 
-		/* Now fake an IOPORT resource */
+		/* Now fake an IOPORT or MEMORY resource */
 		res = sc->sc_bar_mappings[bidx].res;
-		resource_list_add(&pdev->resources, SYS_RES_IOPORT, 0,
+		type = sc->sc_bar_mappings[bidx].type;
+		resource_list_add(&pdev->resources, type, 0,
 		    rman_get_start(res) + sc->sc_desc->ports[i].offset,
 		    rman_get_start(res) + sc->sc_desc->ports[i].offset + 8 - 1,
 		    8);
-		rle = resource_list_find(&pdev->resources, SYS_RES_IOPORT, 0);
+		rle = resource_list_find(&pdev->resources, type, 0);
 
 		if (sc->barmuxed == 0) {
 			rle->res = sc->sc_bar_mappings[bidx].res;
@@ -264,8 +271,7 @@ puc_attach(device_t dev, const struct puc_device_description *desc)
 		if (sc->sc_ports[i].dev == NULL) {
 			if (sc->barmuxed) {
 				bus_space_unmap(rman_get_bustag(rle->res),
-						rman_get_bushandle(rle->res),
-						8);
+				    rman_get_bushandle(rle->res), 8);
 				free(rle->res, M_DEVBUF);
 				free(pdev, M_DEVBUF);
 			}
diff --git a/sys/dev/puc/pucvar.h b/sys/dev/puc/pucvar.h
index 22f8ff3..fcbb0eb 100644
--- a/sys/dev/puc/pucvar.h
+++ b/sys/dev/puc/pucvar.h
@@ -91,6 +91,8 @@ struct puc_device_description {
 #define	PUC_PORT_TYPE_COM	1
 #define	PUC_PORT_TYPE_LPT	2
 
+#define	PUC_FLAGS_MEMORY	0x0001		/* Use memory mapped I/O. */
+
 #define	PUC_PORT_VALID(desc, port) \
   ((port) < PUC_MAX_PORTS && (desc)->ports[(port)].type != PUC_PORT_TYPE_NONE)
 
@@ -128,6 +130,7 @@ struct puc_softc {
 	struct {
 		int		used;
 		int 		bar;
+		int		type;	/* SYS_RES_IOPORT or SYS_RES_MEMORY. */
 		struct resource	*res;
 	} sc_bar_mappings[PUC_MAX_BAR];