Merge branch 'x86-debug-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git...

[deliverable/linux.git] / drivers / mmc / host / atmel-mci-regs.h

diff --git a/drivers/mmc/host/atmel-mci-regs.h b/drivers/mmc/host/atmel-mci-regs.h
index 787aba1682bb362efa7f06baf16370f4551f2074..ab56f7db53150e907c406daff62be29fd5686cec 100644 (file)
--- a/drivers/mmc/host/atmel-mci-regs.h
+++ b/drivers/mmc/host/atmel-mci-regs.h
@@ -140,4 +140,18 @@
 #define atmci_writel(port,reg,value)                   \
        __raw_writel((value), (port)->regs + reg)
 
+/*
+ * Fix sconfig's burst size according to atmel MCI. We need to convert them as:
+ * 1 -> 0, 4 -> 1, 8 -> 2, 16 -> 3.
+ *
+ * This can be done by finding most significant bit set.
+ */
+static inline unsigned int atmci_convert_chksize(unsigned int maxburst)
+{
+       if (maxburst > 1)
+               return fls(maxburst) - 2;
+       else
+               return 0;
+}
+
 #endif /* __DRIVERS_MMC_ATMEL_MCI_H__ */