When using DMA, drivers need to pass special translation info to the
hardware.
Signed-off-by: Rafał Miłecki <zajec5@xxxxxxxxx>
---
drivers/bcma/core.c | 16 ++++++++++++++++
include/linux/bcma/bcma.h | 5 +++++
2 files changed, 21 insertions(+), 0 deletions(-)
diff --git a/drivers/bcma/core.c b/drivers/bcma/core.c
index 2d8506d..4a04a49 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);
diff --git a/include/linux/bcma/bcma.h b/include/linux/bcma/bcma.h
index cc1582d..8c96654 100644
--- a/include/linux/bcma/bcma.h
+++ b/include/linux/bcma/bcma.h
@@ -262,5 +262,10 @@ extern void bcma_core_set_clockmode(struct bcma_device *core,
enum bcma_clkmode clkmode);
extern void bcma_core_pll_ctl(struct bcma_device *core, u32 req, u32 status,
bool on);
+#define BCMA_DMA_TRANSLATION_MASK 0xC0000000
+#define BCMA_DMA_TRANSLATION_NONE 0x00000000
+#define BCMA_DMA_TRANSLATION_DMA32_CMT 0x40000000 /* Client Mode Translation for 32-bit DMA */
+#define BCMA_DMA_TRANSLATION_DMA64_CMT 0x80000000 /* Client Mode Translation for 64-bit DMA */
+extern u32 bcma_core_dma_translation(struct bcma_device *core);
#endif /* LINUX_BCMA_H_ */
--
1.7.3.4
--
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