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>

diff --git a/drivers/bcma/core.c b/drivers/bcma/core.c
index 2d8506d..4a04a49 100644 (file)
--- 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 (file)
--- 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_ */