1 files changed, 58 insertions, 0 deletions
diff --git a/xen/arch/arm/arm32/debug-pl011.inc b/xen/arch/arm/arm32/debug-pl011.inc
new file mode 100644
index 0000000000..6954aeb660
--- /dev/null
+++ b/xen/arch/arm/arm32/debug-pl011.inc
@@ -0,0 +1,58 @@
+/*
+ * xen/arch/arm/arm32/debug-pl011.inc
+ *
+ * PL011 specific debug code
+ *
+ * Copyright (c) 2013 Citrix Systems.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ */
+
+#define EARLY_UART_BASE_ADDRESS 0x1c090000
+
+/* PL011 UART initialization
+ * rb: register which contains the UART base address
+ * rc: scratch register 1
+ * rd: scratch register 2 (unused here) */
+.macro early_uart_init rb, rc, rd
+        mov   \rc, #0x0
+        str   \rc, [\rb, #0x28]     /* -> UARTFBRD (Baud divisor fraction) */
+        mov   \rc, #0x4             /* 7.3728MHz / 0x4 == 16 * 115200 */
+        str   \rc, [\rb, #0x24]     /* -> UARTIBRD (Baud divisor integer) */
+        mov   \rc, #0x60            /* 8n1 */
+        str   \rc, [\rb, #0x2C]     /* -> UARTLCR_H (Line control) */
+        ldr   \rc, =0x00000301      /* RXE | TXE | UARTEN */
+        str   \rc, [\rb, #0x30]     /* -> UARTCR (Control Register) */
+.endm
+
+/* PL011 UART wait UART to be ready to transmit
+ * rb: register which contains the UART base address
+ * rc: scratch register */
+.macro early_uart_ready rb, rc
+1:
+        ldr   \rc, [\rb, #0x18]     /* <- UARTFR (Flag register) */
+        tst   \rc, #0x8             /* Check BUSY bit */
+        bne   1b                    /* Wait for the UART to be ready */
+.endm
+
+/* PL011 UART transmit character
+ * rb: register which contains the UART base address
+ * rt: register which contains the character to transmit */
+.macro early_uart_transmit rb, rt
+        str   \rt, [\rb]            /* -> UARTDR (Data Register) */
+.endm
+
+/*
+ * Local variables:
+ * mode: ASM
+ * indent-tabs-mode: nil
+ * End:
+ */