goldfish: enable 64-bit tty driver

Signed-off-by: Jun Tian <jun.j.tian@intel.com>
Signed-off-by: Alan Cox <alan@linux.intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/tty/goldfish.c

@@ -29,6 +29,9 @@ enum {
 
 	GOLDFISH_TTY_DATA_PTR       = 0x10,
 	GOLDFISH_TTY_DATA_LEN       = 0x14,
+#ifdef CONFIG_64BIT
+	GOLDFISH_TTY_DATA_PTR_HIGH  = 0x18,
+#endif
 
 	GOLDFISH_TTY_CMD_INT_DISABLE    = 0,
 	GOLDFISH_TTY_CMD_INT_ENABLE     = 1,
@@ -58,6 +61,9 @@ static void goldfish_tty_do_write(int line, const char *buf, unsigned count)
 	void __iomem *base = qtty->base;
 	spin_lock_irqsave(&qtty->lock, irq_flags);
 	writel((u32)buf, base + GOLDFISH_TTY_DATA_PTR);
+#ifdef CONFIG_64BIT
+	writel((u32)((u64)buf >> 32), base + GOLDFISH_TTY_DATA_PTR_HIGH);
+#endif
 	writel(count, base + GOLDFISH_TTY_DATA_LEN);
 	writel(GOLDFISH_TTY_CMD_WRITE_BUFFER, base + GOLDFISH_TTY_CMD);
 	spin_unlock_irqrestore(&qtty->lock, irq_flags);
@@ -79,6 +85,9 @@ static irqreturn_t goldfish_tty_interrupt(int irq, void *dev_id)
 	count = tty_prepare_flip_string(&qtty->port, &buf, count);
 	spin_lock_irqsave(&qtty->lock, irq_flags);
 	writel((u32)buf, base + GOLDFISH_TTY_DATA_PTR);
+#ifdef CONFIG_64BIT
+	writel((u32)((u64)buf >> 32), base + GOLDFISH_TTY_DATA_PTR_HIGH);
+#endif
 	writel(count, base + GOLDFISH_TTY_DATA_LEN);
 	writel(GOLDFISH_TTY_CMD_READ_BUFFER, base + GOLDFISH_TTY_CMD);
 	spin_unlock_irqrestore(&qtty->lock, irq_flags);