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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>
utp
Simon Glass 2015-06-23 15:39:06 -06:00
parent 6f849c3012
commit 6e780c7a7b
1 changed files with 20 additions and 14 deletions
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34
drivers/serial/ns16550.c
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@ -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_dout(&com_port->ier, CONFIG_SYS_NS16550_IER);
serial_dout(&com_port->mcr, UART_MCRVAL);
serial_dout(&com_port->fcr, 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->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