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>

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);

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_ */