[S] Change in coreboot[master]: src/drivers/uart: Add definition of FIFO enabled in IIR

[Felix Held (Code Review)]

Felix Held has submitted this change. ( https://review.coreboot.org/c/coreboot/+/68566 )

(

2 is the latest approved patch-set.
No files were changed between the latest approved patch-set and the submitted one.
 )Change subject: src/drivers/uart: Add definition of FIFO enabled in IIR
......................................................................

src/drivers/uart: Add definition of FIFO enabled in IIR

Interrupt Identification Register (IIR) is a I/O read-access register.
Add definition of FIFO enabled for this register so that we can check
whether FIFO is enabled or not.

Signed-off-by: Tim Chu 
Change-Id: I12e8566822693004418cf83cae466dc3e2d612c4
Reviewed-on: https://review.coreboot.org/c/coreboot/+/68566
Reviewed-by: Jonathan Zhang 
Reviewed-by: Angel Pons 
Tested-by: build bot (Jenkins) 
---
M src/drivers/uart/uart8250reg.h
1 file changed, 19 insertions(+), 0 deletions(-)

Approvals:
  build bot (Jenkins): Verified
  Angel Pons: Looks good to me, but someone else must approve
  Jonathan Zhang: Looks good to me, approved

diff --git a/src/drivers/uart/uart8250reg.h b/src/drivers/uart/uart8250reg.h
index 35a6845..c6f23ac 100644
--- a/src/drivers/uart/uart8250reg.h
+++ b/src/drivers/uart/uart8250reg.h
@@ -24,6 +24,7 @@
 #define   UART8250_IIR_THRI	0x02 /* Transmitter holding register empty */
 #define   UART8250_IIR_RDI	0x04 /* Receiver data interrupt */
 #define   UART8250_IIR_RLSI	0x06 /* Receiver line status interrupt */
+#define   UART8250_IIR_FIFO_EN	0xC0 /* FIFO enabled */

#define UART8250_FCR 0x02
 #define   UART8250_FCR_FIFO_EN		BIT(0) /* Fifo enable */