ns16550: Improve debug UART so it can work with 32-bit access

Since Rockchip requires 32-bit serial access, add this to the driver.
Refactor a little to make this easier.

Signed-off-by: Simon Glass <sjg@chromium.org>

diff --git a/drivers/serial/ns16550.c b/drivers/serial/ns16550.c
index 9b044a37da500f3deabfde65d1b9684e2f03957c..c8a77e295e9ee9d3c2f1108d1b86014bb6d46bd2 100644 (file)
--- a/drivers/serial/ns16550.c
+++ b/drivers/serial/ns16550.c
@@ -246,6 +246,17 @@ int NS16550_tstc(NS16550_t com_port)
 
 #include <debug_uart.h>
 
+#define serial_dout(reg, value)        \
+       serial_out_shift((char *)com_port + \
+               ((char *)reg - (char *)com_port) * \
+                       (1 << CONFIG_DEBUG_UART_SHIFT), \
+               CONFIG_DEBUG_UART_SHIFT, value)
+#define serial_din(reg) \
+       serial_in_shift((char *)com_port + \
+               ((char *)reg - (char *)com_port) * \
+                       (1 << CONFIG_DEBUG_UART_SHIFT), \
+               CONFIG_DEBUG_UART_SHIFT)
+
 void debug_uart_init(void)
 {
        struct NS16550 *com_port = (struct NS16550 *)CONFIG_DEBUG_UART_BASE;
@@ -259,28 +270,23 @@ void debug_uart_init(void)
         */
        baud_divisor = calc_divisor(com_port, CONFIG_DEBUG_UART_CLOCK,
                                    CONFIG_BAUDRATE);
-       serial_out_shift(&com_port->ier, CONFIG_DEBUG_UART_SHIFT,
-                        CONFIG_SYS_NS16550_IER);
-       serial_out_shift(&com_port->mcr, CONFIG_DEBUG_UART_SHIFT, UART_MCRVAL);
-       serial_out_shift(&com_port->fcr, CONFIG_DEBUG_UART_SHIFT, UART_FCRVAL);
-
-       serial_out_shift(&com_port->lcr, CONFIG_DEBUG_UART_SHIFT,
-                        UART_LCR_BKSE | UART_LCRVAL);
-       serial_out_shift(&com_port->dll, CONFIG_DEBUG_UART_SHIFT,
-                        baud_divisor & 0xff);
-       serial_out_shift(&com_port->dlm, CONFIG_DEBUG_UART_SHIFT,
-                        (baud_divisor >> 8) & 0xff);
-       serial_out_shift(&com_port->lcr, CONFIG_DEBUG_UART_SHIFT,
-                        UART_LCRVAL);
+       serial_dout(&com_port->ier, CONFIG_SYS_NS16550_IER);
+       serial_dout(&com_port->mcr, UART_MCRVAL);
+       serial_dout(&com_port->fcr, UART_FCRVAL);
+
+       serial_dout(&com_port->lcr, UART_LCR_BKSE | UART_LCRVAL);
+       serial_dout(&com_port->dll, baud_divisor & 0xff);
+       serial_dout(&com_port->dlm, (baud_divisor >> 8) & 0xff);
+       serial_dout(&com_port->lcr, UART_LCRVAL);
 }
 
 static inline void _debug_uart_putc(int ch)
 {
        struct NS16550 *com_port = (struct NS16550 *)CONFIG_DEBUG_UART_BASE;
 
-       while (!(serial_in_shift(&com_port->lsr, 0) & UART_LSR_THRE))
+       while (!(serial_din(&com_port->lsr) & UART_LSR_THRE))
                ;
-       serial_out_shift(&com_port->thr, CONFIG_DEBUG_UART_SHIFT, ch);
+       serial_dout(&com_port->thr, ch);
 }
 
 DEBUG_UART_FUNCS