[PATCH 3/3] xen/arm: Define WLEN_8 macro and use it in debug-pl011

[Michal Orzel <michal.orzel@xxxxxxx>]

At the moment, early printk code for pl011 uses a hardcoded value
for 8n1 LCR configuration. Define and use macro WLEN_8 for that purpose
(no parity and 1 stop bit are defined as 0).

Signed-off-by: Michal Orzel <michal.orzel@xxxxxxx>
---
 xen/arch/arm/arm32/debug-pl011.inc    | 2 +-
 xen/arch/arm/arm64/debug-pl011.inc    | 2 +-
 xen/arch/arm/include/asm/pl011-uart.h | 1 +
 3 files changed, 3 insertions(+), 2 deletions(-)

diff --git a/xen/arch/arm/arm32/debug-pl011.inc 
b/xen/arch/arm/arm32/debug-pl011.inc
index 214f68dc95bd..c527f1d4424d 100644
--- a/xen/arch/arm/arm32/debug-pl011.inc
+++ b/xen/arch/arm/arm32/debug-pl011.inc
@@ -29,7 +29,7 @@
         str   \rc, [\rb, #FBRD]     /* -> UARTFBRD (Baud divisor fraction) */
         mov   \rc, #(7372800 / CONFIG_EARLY_UART_PL011_BAUD_RATE / 16)
         str   \rc, [\rb, #IBRD]     /* -> UARTIBRD (Baud divisor integer) */
-        mov   \rc, #0x60            /* 8n1 */
+        mov   \rc, #WLEN_8          /* 8n1 */
         str   \rc, [\rb, #LCR_H]     /* -> UARTLCR_H (Line control) */
         ldr   \rc, =(RXE | TXE | UARTEN)      /* RXE | TXE | UARTEN */
         str   \rc, [\rb, #CR]     /* -> UARTCR (Control Register) */
diff --git a/xen/arch/arm/arm64/debug-pl011.inc 
b/xen/arch/arm/arm64/debug-pl011.inc
index d82f2f1de197..6d60e78c8ba3 100644
--- a/xen/arch/arm/arm64/debug-pl011.inc
+++ b/xen/arch/arm/arm64/debug-pl011.inc
@@ -28,7 +28,7 @@
         strh  w\c, [\xb, #FBRD]      /* -> UARTFBRD (Baud divisor fraction) */
         mov   x\c, #(7372800 / CONFIG_EARLY_UART_PL011_BAUD_RATE / 16)
         strh  w\c, [\xb, #IBRD]      /* -> UARTIBRD (Baud divisor integer) */
-        mov   x\c, #0x60             /* 8n1 */
+        mov   x\c, #WLEN_8           /* 8n1 */
         str   w\c, [\xb, #LCR_H]     /* -> UARTLCR_H (Line control) */
         ldr   x\c, =(RXE | TXE | UARTEN)
         str   w\c, [\xb, #CR]        /* -> UARTCR (Control Register) */
diff --git a/xen/arch/arm/include/asm/pl011-uart.h 
b/xen/arch/arm/include/asm/pl011-uart.h
index 57e9ec73ac19..5bb563ec0814 100644
--- a/xen/arch/arm/include/asm/pl011-uart.h
+++ b/xen/arch/arm/include/asm/pl011-uart.h
@@ -55,6 +55,7 @@
 
 /* LCR_H bits */
 #define SPS    (1<<7) /* Stick parity select */
+#define WLEN_8 (_AC(0x3, U) << 5) /* 8 bits word length */
 #define FEN    (1<<4) /* FIFO enable */
 #define STP2   (1<<3) /* Two stop bits select */
 #define EPS    (1<<2) /* Even parity select */
-- 
2.25.1