diff options
| -rw-r--r-- | drivers/of/device.c | 48 |
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; /* |