summaryrefslogtreecommitdiffstats
path: root/drivers/of/device.c
diff options
context:
space:
mode:
Diffstat (limited to 'drivers/of/device.c')
-rw-r--r--drivers/of/device.c48
1 files changed, 32 insertions, 16 deletions
diff --git a/drivers/of/device.c b/drivers/of/device.c
index e0a28ea341fe..04c4c952dc57 100644
--- a/drivers/of/device.c
+++ b/drivers/of/device.c
@@ -9,6 +9,9 @@
#include <linux/module.h>
#include <linux/mod_devicetable.h>
#include <linux/slab.h>
+#include <linux/pci.h>
+#include <linux/platform_device.h>
+#include <linux/amba/bus.h>
#include <asm/errno.h>
#include "of_private.h"
@@ -84,31 +87,28 @@ int of_device_add(struct platform_device *ofdev)
*/
int of_dma_configure(struct device *dev, struct device_node *np)
{
- u64 dma_addr, paddr, size;
+ u64 dma_addr, paddr, size = 0;
int ret;
bool coherent;
unsigned long offset;
const struct iommu_ops *iommu;
u64 mask;
- /*
- * Set default coherent_dma_mask to 32 bit. Drivers are expected to
- * setup the correct supported mask.
- */
- if (!dev->coherent_dma_mask)
- dev->coherent_dma_mask = DMA_BIT_MASK(32);
-
- /*
- * Set it to coherent_dma_mask by default if the architecture
- * code has not set it.
- */
- if (!dev->dma_mask)
- dev->dma_mask = &dev->coherent_dma_mask;
-
ret = of_dma_get_range(np, &dma_addr, &paddr, &size);
if (ret < 0) {
+ /*
+ * For legacy reasons, we have to assume some devices need
+ * DMA configuration regardless of whether "dma-ranges" is
+ * correctly specified or not.
+ */
+ if (!dev_is_pci(dev) &&
+#ifdef CONFIG_ARM_AMBA
+ dev->bus != &amba_bustype &&
+#endif
+ dev->bus != &platform_bus_type)
+ return ret == -ENODEV ? 0 : ret;
+
dma_addr = offset = 0;
- size = max(dev->coherent_dma_mask, dev->coherent_dma_mask + 1);
} else {
offset = PFN_DOWN(paddr - dma_addr);
@@ -129,6 +129,22 @@ int of_dma_configure(struct device *dev, struct device_node *np)
dev_dbg(dev, "dma_pfn_offset(%#08lx)\n", offset);
}
+ /*
+ * Set default coherent_dma_mask to 32 bit. Drivers are expected to
+ * setup the correct supported mask.
+ */
+ if (!dev->coherent_dma_mask)
+ dev->coherent_dma_mask = DMA_BIT_MASK(32);
+ /*
+ * Set it to coherent_dma_mask by default if the architecture
+ * code has not set it.
+ */
+ if (!dev->dma_mask)
+ dev->dma_mask = &dev->coherent_dma_mask;
+
+ if (!size)
+ size = max(dev->coherent_dma_mask, dev->coherent_dma_mask + 1);
+
dev->dma_pfn_offset = offset;
/*