1 files changed, 12 insertions, 0 deletions

diff --git a/drivers/serial/8250.c b/drivers/serial/8250.c
index 0995430e4cf1..5443fcd38355 100644
--- a/drivers/serial/8250.c
+++ b/drivers/serial/8250.c
@@ -299,6 +299,7 @@ static inline int map_8250_out_reg(struct uart_8250_port *up, int offset)
 
 static unsigned int serial_in(struct uart_8250_port *up, int offset)
 {
+        unsigned int tmp;
         offset = map_8250_in_reg(up, offset) << up->port.regshift;
 
         switch (up->port.iotype) {
@@ -317,6 +318,13 @@ static unsigned int serial_in(struct uart_8250_port *up, int offset)
                 return __raw_readl(up->port.membase + offset);
 #endif
 
+        case UPIO_TSI:
+                if (offset == UART_IIR) {
+                        tmp = readl((u32 *)(up->port.membase + UART_RX));
+                        return (cpu_to_le32(tmp) >> 8) & 0xff;
+                } else
+                        return readb(up->port.membase + offset);
+
         default:
                 return inb(up->port.iobase + offset);
         }
@@ -346,6 +354,10 @@ serial_out(struct uart_8250_port *up, int offset, int value)
                 __raw_writel(value, up->port.membase + offset);
                 break;
 #endif
+        case UPIO_TSI:
+                if (!((offset == UART_IER) && (value & UART_IER_UUE)))
+                        writeb(value, up->port.membase + offset);
+                break;
 
         default:
                 outb(value, up->port.iobase + offset);