inmates: arm: Add support Marvell UART

Analogously to the hypervisor, add a UART driver for Marvel UARTs as
found in the Armada 3720.

Signed-off-by: Jan Kiszka <jan.kiszka@siemens.com>

inmates/lib/arm-common/Makefile.lib

@@ -14,7 +14,7 @@ GCOV_PROFILE := n
 
 OBJS-y := ../string.o ../cmdline.o
 OBJS-y += printk.o gic.o timer.o
-OBJS-y += uart-jailhouse.o uart-pl011.o uart-8250.o uart-xuartps.o
+OBJS-y += uart-jailhouse.o uart-pl011.o uart-8250.o uart-xuartps.o uart-mvebu.o
 OBJS-$(CONFIG_ARM_GIC_V2) += gic-v2.o
 OBJS-$(CONFIG_ARM_GIC_V3) += gic-v3.o
 

inmates/lib/arm-common/include/uart.h

@@ -27,3 +27,4 @@ extern struct uart_chip uart_jailhouse_ops;
 extern struct uart_chip uart_8250_ops;
 extern struct uart_chip uart_pl011_ops;
 extern struct uart_chip uart_xuartps_ops;
+extern struct uart_chip uart_mvebu_ops;

inmates/lib/arm-common/printk.c

@@ -64,6 +64,8 @@ static void console_init(void)
 		chip = &uart_pl011_ops;
 	else if (!strcmp(type, "XUARTPS"))
 		chip = &uart_xuartps_ops;
+	else if (!strcmp(type, "MVEBU"))
+		chip = &uart_mvebu_ops;
 
 	if (!chip)
 		return;

inmates/lib/arm-common/uart-mvebu.c

@@ -0,0 +1,38 @@
+/*
+ * Jailhouse, a Linux-based partitioning hypervisor
+ *
+ * Copyright (c) Siemens AG, 2017
+ *
+ * Authors:
+ *  Jan Kiszka <jan.kiszka@siemens.com>
+ *
+ * This work is licensed under the terms of the GNU GPL, version 2.  See
+ * the COPYING file in the top-level directory.
+ */
+
+#include <inmate.h>
+#include <uart.h>
+
+#define UART_TSH		0x4
+#define UART_STAT		0xc
+#define  UART_STAT_TX_FULL	(1 << 11)
+
+static void uart_init(struct uart_chip *chip)
+{
+}
+
+static bool uart_is_busy(struct uart_chip *chip)
+{
+	return !!(mmio_read32(chip->base + UART_STAT) & UART_STAT_TX_FULL);
+}
+
+static void uart_write(struct uart_chip *chip, char c)
+{
+	mmio_write32(chip->base + UART_TSH, c);
+}
+
+struct uart_chip uart_mvebu_ops = {
+	.init = uart_init,
+	.is_busy = uart_is_busy,
+	.write = uart_write,
+};