bcma: inform drivers about translation bits needed for the core

When using DMA, drivers need to pass special translation info to the
hardware.

Signed-off-by: Rafał Miłecki <zajec5@gmail.com>
Signed-off-by: John W. Linville <linville@tuxdriver.com>

1 files changed, 16 insertions, 0 deletions

diff --git a/drivers/bcma/core.c b/drivers/bcma/core.c
index 2d8506dbca76..4a04a49cc06d 100644
--- a/drivers/bcma/core.c
+++ b/drivers/bcma/core.c
@@ -106,3 +106,19 @@ void bcma_core_pll_ctl(struct bcma_device *core, u32 req, u32 status, bool on)
         }
 }
 EXPORT_SYMBOL_GPL(bcma_core_pll_ctl);
+
+u32 bcma_core_dma_translation(struct bcma_device *core)
+{
+        switch (core->bus->hosttype) {
+        case BCMA_HOSTTYPE_PCI:
+                if (bcma_aread32(core, BCMA_IOST) & BCMA_IOST_DMA64)
+                        return BCMA_DMA_TRANSLATION_DMA64_CMT;
+                else
+                        return BCMA_DMA_TRANSLATION_DMA32_CMT;
+        default:
+                pr_err("DMA translation unknown for host %d\n",
+                       core->bus->hosttype);
+        }
+        return BCMA_DMA_TRANSLATION_NONE;
+}
+EXPORT_SYMBOL(bcma_core_dma_translation);