[PATCH v1] xen/arm: Add Marvell ARMADA 3700 early printk support

[PATCH v1] xen/arm: Add Marvell ARMADA 3700 early printk support

[Amit Singh Tomar]

Signed-off-by: Amit Singh Tomar <amittomer25@gmail.com>
---
 docs/misc/arm/early-printk.txt     |  1 +
 xen/arch/arm/Rules.mk              |  1 +
 xen/arch/arm/arm64/debug-mvebu.inc | 48 ++++++++++++++++++++++++++++++++++++++
 3 files changed, 50 insertions(+)
 create mode 100644 xen/arch/arm/arm64/debug-mvebu.inc

diff --git a/docs/misc/arm/early-printk.txt b/docs/misc/arm/early-printk.txt
index 20a8af8..f765f59 100644
--- a/docs/misc/arm/early-printk.txt
+++ b/docs/misc/arm/early-printk.txt
@@ -41,6 +41,7 @@ the name of the machine:
   - juno: printk with pl011 on Juno platform
   - lager: printk with SCIF0 on Renesas R-Car H2 processors
   - midway: printk with the pl011 on Calxeda Midway processors
+  - mvebu: printk with the MVEBU for Marvell Armada 3700 SoCs
   - omap5432: printk with UART3 on TI OMAP5432 processors
   - rcar3: printk with SCIF2 on Renesas R-Car Gen3 processors
   - seattle: printk with pl011 for AMD Seattle processor
diff --git a/xen/arch/arm/Rules.mk b/xen/arch/arm/Rules.mk
index b66c19f..f264592 100644
--- a/xen/arch/arm/Rules.mk
+++ b/xen/arch/arm/Rules.mk
@@ -36,6 +36,7 @@ EARLY_PRINTK_hikey960       := pl011,0xfff32000
 EARLY_PRINTK_juno           := pl011,0x7ff80000
 EARLY_PRINTK_lager          := scif,0xe6e60000
 EARLY_PRINTK_midway         := pl011,0xfff36000
+EARLY_PRINTK_mvebu          := mvebu,0xd0012000
 EARLY_PRINTK_omap5432       := 8250,0x48020000,2
 EARLY_PRINTK_rcar3          := scif,0xe6e88000
 EARLY_PRINTK_seattle        := pl011,0xe1010000
diff --git a/xen/arch/arm/arm64/debug-mvebu.inc b/xen/arch/arm/arm64/debug-mvebu.inc
new file mode 100644
index 0000000..67dc44d
--- /dev/null
+++ b/xen/arch/arm/arm64/debug-mvebu.inc
@@ -0,0 +1,48 @@
+/*
+ * xen/arch/arm/arm64/debug-mvebu.inc
+ *
+ * MVEBU specific debug code
+ *
+ * Amit Singh Tomar <amittomer25@gmail.com>
+ * Copyright (C) 2018.
+ *
+ * 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.
+ */
+
+#include <asm/mvebu-uart.h>
+
+/*
+ * MVEBU UART wait UART to be ready to transmit
+ * xb: register which contains the UART base address
+ * c: scratch register
+ */
+.macro early_uart_ready xb c
+1:
+        ldrh   w\c, [\xb, #UART_STATUS_REG]  /* <- status register */
+        tst    w\c, #(1 << 13)		         /* <- Check TXFIFO EMP bit */
+        beq    1b                            /* <- Wait for the UART to be ready */
+.endm
+
+/*
+ * MVEBU UART transmit character
+ * xb: register which contains the UART base address
+ * wt: register which contains the character to transmit
+ */
+.macro early_uart_transmit xb wt
+	strb  \wt, [\xb, #UART_TX_REG]
+.endm
+
+/*
+ * Local variables:
+ * mode: ASM
+ * indent-tabs-mode: nil
+ * End:
+ */
-- 
1.9.1


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