@@ -23,6 +23,7 @@
#include <linux/serial_reg.h>
#include <linux/clk.h>
#include <linux/io.h>
+#include <linux/delay.h>
#include <plat/common.h>
#include <plat/board.h>
@@ -139,6 +140,13 @@ static inline unsigned int serial_read_reg(struct plat_serial8250_port *up,
return (unsigned int)__raw_readb(up->membase + offset);
}
+static inline void __serial_write_reg(struct uart_port *up, int offset,
+ int value)
+{
+ offset <<= up->regshift;
+ __raw_writeb(value, up->membase + offset);
+}
+
static inline void serial_write_reg(struct plat_serial8250_port *p, int offset,
int value)
{
@@ -598,6 +606,20 @@ static unsigned int serial_in_override(struct uart_port *up, int offset)
return __serial_read_reg(up, offset);
}
+static void serial_out_override(struct uart_port *up, int offset, int value)
+{
+ unsigned int status, tmout = 10000;
+
+ /* Wait up to 10ms for the character(s) to be sent. */
+ do {
+ status = __serial_read_reg(up, UART_LSR);
+ if (--tmout == 0)
+ break;
+ udelay(1);
+ } while (!(status & UART_LSR_THRE));
+
+ __serial_write_reg(up, offset, value);
+}
void __init omap_serial_early_init(void)
{
int i;
@@ -698,11 +720,15 @@ void __init omap_serial_init_port(int port)
* omap3xxx: Never read empty UART fifo on UARTs
* with IP rev >=0x52
*/
- if (cpu_is_omap44xx())
+ if (cpu_is_omap44xx()) {
uart->p->serial_in = serial_in_override;
+ uart->p->serial_out = serial_out_override;
+ }
else if ((serial_read_reg(uart->p, UART_OMAP_MVER) & 0xFF)
- >= UART_OMAP_NO_EMPTY_FIFO_READ_IP_REV)
+ >= UART_OMAP_NO_EMPTY_FIFO_READ_IP_REV) {
uart->p->serial_in = serial_in_override;
+ uart->p->serial_out = serial_out_override;
+ }
}
/**