PNP: make generic pnp_add_dma_resource()

Add a pnp_add_dma_resource() that can be used by all the PNP
backends.  This consolidates a little more pnp_resource_table
knowledge into one place.

Signed-off-by: Bjorn Helgaas <bjorn.helgaas@hp.com>
Signed-off-by: Len Brown <len.brown@intel.com>

drivers/pnp/base.h

@@ -43,3 +43,5 @@ struct pnp_resource_table {
 
 struct pnp_resource *pnp_add_irq_resource(struct pnp_dev *dev, int irq,
 					  int flags);
+struct pnp_resource *pnp_add_dma_resource(struct pnp_dev *dev, int dma,
+					  int flags);

drivers/pnp/interface.c

@@ -440,16 +440,10 @@ pnp_set_current_resources(struct device *dmdev, struct device_attribute *attr,
 				buf += 3;
 				while (isspace(*buf))
 					++buf;
-				pnp_res = pnp_get_pnp_resource(dev,
-						IORESOURCE_DMA, ndma);
-				if (!pnp_res)
-					break;
-				pnp_res->index = ndma;
-				res = &pnp_res->res;
-				res->start = res->end =
-				    simple_strtoul(buf, &buf, 0);
-				res->flags = IORESOURCE_DMA;
-				ndma++;
+				start = simple_strtoul(buf, &buf, 0);
+				pnp_res = pnp_add_dma_resource(dev, start, 0);
+				if (pnp_res)
+					pnp_res->index = ndma++;
 				continue;
 			}
 			break;

drivers/pnp/isapnp/core.c

@@ -973,12 +973,9 @@ static int isapnp_read_resources(struct pnp_dev *dev)
 			ret = isapnp_read_byte(ISAPNP_CFG_DMA + tmp);
 			if (ret == 4)
 				continue;
-			pnp_res = pnp_get_pnp_resource(dev, IORESOURCE_DMA,
-						       tmp);
-			pnp_res->index = tmp;
-			res = &pnp_res->res;
-			res->start = res->end = ret;
-			res->flags = IORESOURCE_DMA;
+			pnp_res = pnp_add_dma_resource(dev, ret, 0);
+			if  (pnp_res)
+				pnp_res->index = tmp;
 		}
 	}
 	return 0;

drivers/pnp/pnpacpi/rsparser.c

@@ -158,34 +158,6 @@ static int dma_flags(int type, int bus_master, int transfer)
 	return flags;
 }
 
-static void pnpacpi_parse_allocated_dmaresource(struct pnp_dev *dev,
-						u32 dma, int flags)
-{
-	struct resource *res;
-	int i;
-	static unsigned char warned;
-
-	for (i = 0; i < PNP_MAX_DMA; i++) {
-		res = pnp_get_resource(dev, IORESOURCE_DMA, i);
-		if (!pnp_resource_valid(res))
-			break;
-	}
-	if (i < PNP_MAX_DMA) {
-		res->flags = IORESOURCE_DMA;	// Also clears _UNSET flag
-		res->flags |= flags;
-		if (dma == -1) {
-			res->flags |= IORESOURCE_DISABLED;
-			return;
-		}
-		res->start = dma;
-		res->end = dma;
-	} else if (!warned) {
-		printk(KERN_WARNING "pnpacpi: exceeded the max number of DMA "
-				"resources: %d \n", PNP_MAX_DMA);
-		warned = 1;
-	}
-}
-
 static void pnpacpi_parse_allocated_ioresource(struct pnp_dev *dev,
 					       u64 io, u64 len, int io_decode)
 {
@@ -285,7 +257,7 @@ static acpi_status pnpacpi_allocated_resource(struct acpi_resource *res,
 	struct acpi_resource_memory32 *memory32;
 	struct acpi_resource_fixed_memory32 *fixed_memory32;
 	struct acpi_resource_extended_irq *extended_irq;
-	int i;
+	int i, flags;
 
 	switch (res->type) {
 	case ACPI_RESOURCE_TYPE_IRQ:
@@ -305,11 +277,13 @@ static acpi_status pnpacpi_allocated_resource(struct acpi_resource *res,
 
 	case ACPI_RESOURCE_TYPE_DMA:
 		dma = &res->data.dma;
-		if (dma->channel_count > 0)
-			pnpacpi_parse_allocated_dmaresource(dev,
-				dma->channels[0],
-				dma_flags(dma->type, dma->bus_master,
-					  dma->transfer));
+		if (dma->channel_count > 0) {
+			flags = dma_flags(dma->type, dma->bus_master,
+					  dma->transfer);
+			if (dma->channels[0] == (u8) -1)
+				flags |= IORESOURCE_DISABLED;
+			pnp_add_dma_resource(dev, dma->channels[0], flags);
+		}
 		break;
 
 	case ACPI_RESOURCE_TYPE_IO:

drivers/pnp/pnpbios/rsparser.c

@@ -54,27 +54,6 @@ inline void pcibios_penalize_isa_irq(int irq, int active)
  * Allocated Resources
  */
 
-static void pnpbios_parse_allocated_dmaresource(struct pnp_dev *dev, int dma)
-{
-	struct resource *res;
-	int i;
-
-	for (i = 0; i < PNP_MAX_DMA; i++) {
-		res = pnp_get_resource(dev, IORESOURCE_DMA, i);
-		if (!pnp_resource_valid(res))
-			break;
-	}
-
-	if (i < PNP_MAX_DMA) {
-		res->flags = IORESOURCE_DMA;	// Also clears _UNSET flag
-		if (dma == -1) {
-			res->flags |= IORESOURCE_DISABLED;
-			return;
-		}
-		res->start = res->end = (unsigned long)dma;
-	}
-}
-
 static void pnpbios_parse_allocated_ioresource(struct pnp_dev *dev,
 					       int io, int len)
 {
@@ -199,12 +178,15 @@ static unsigned char *pnpbios_parse_allocated_resource_data(struct pnp_dev *dev,
 		case SMALL_TAG_DMA:
 			if (len != 2)
 				goto len_err;
+			flags = 0;
 			io = -1;
 			mask = p[1];
 			for (i = 0; i < 8; i++, mask = mask >> 1)
 				if (mask & 0x01)
 					io = i;
-			pnpbios_parse_allocated_dmaresource(dev, io);
+			if (io == -1)
+				flags = IORESOURCE_DISABLED;
+			pnp_add_dma_resource(dev, io, flags);
 			break;
 
 		case SMALL_TAG_PORT:

drivers/pnp/resource.c

@@ -602,6 +602,32 @@ struct pnp_resource *pnp_add_irq_resource(struct pnp_dev *dev, int irq,
 	return pnp_res;
 }
 
+struct pnp_resource *pnp_add_dma_resource(struct pnp_dev *dev, int dma,
+					  int flags)
+{
+	struct pnp_resource *pnp_res;
+	struct resource *res;
+	static unsigned char warned;
+
+	pnp_res = pnp_new_resource(dev, IORESOURCE_DMA);
+	if (!pnp_res) {
+		if (!warned) {
+			dev_err(&dev->dev, "can't add resource for DMA %d\n",
+				dma);
+			warned = 1;
+		}
+		return NULL;
+	}
+
+	res = &pnp_res->res;
+	res->flags = IORESOURCE_DMA | flags;
+	res->start = dma;
+	res->end = dma;
+
+	dev_dbg(&dev->dev, "  add dma %d flags %#x\n", dma, flags);
+	return pnp_res;
+}
+
 /* format is: pnp_reserve_irq=irq1[,irq2] .... */
 static int __init pnp_setup_reserve_irq(char *str)
 {