pl011: Add support in AArch32 for MULTI_CONSOLE_API

Allow AArch32 to use the multi console driver by adding the
required functions

Change-Id: I9e69f18965f320074cf75442d6b0de891aef7936
Signed-off-by: Daniel Boulby <daniel.boulby@arm.com>

1 files changed, 43 insertions, 0 deletions

diff --git a/include/common/aarch32/console_macros.S b/include/common/aarch32/console_macros.S
new file mode 100644
index 00000000..480e3c29
--- /dev/null
+++ b/include/common/aarch32/console_macros.S
@@ -0,0 +1,43 @@
+/*
+ * Copyright (c) 2018, ARM Limited and Contributors. All rights reserved.
+ *
+ * SPDX-License-Identifier: BSD-3-Clause
+ */
+#ifndef __CONSOLE_MACROS_S__
+#define __CONSOLE_MACROS_S__
+
+#include <console.h>
+
+/*
+ * This macro encapsulates the common setup that has to be done at the end of
+ * a console driver's register function. It will register all of the driver's
+ * callbacks in the console_t structure and initialize the flags field (by
+ * default consoles are enabled for the "boot" and "crash" states, this can be
+ * changed after registration with the console_set_scope() function). It ends
+ * with a tail call that will include return to the caller.
+ * REQUIRES console_t pointer in x0 and a valid return address in x30.
+ */
+	.macro	finish_console_register _driver
+	/*
+	 * Add these weak definitions so we will automatically write a 0 if the
+	 * function doesn't exist. I'd rather use .ifdef but that only works if
+	 * the function was defined (not just declared .global) above this point
+	 * in the file, which we can't guarantee.
+	 */
+	.weak console_\_driver\()_putc
+	.weak console_\_driver\()_getc
+	.weak console_\_driver\()_flush
+
+	/* Don't use adrp on weak funcs! See GNU ld bugzilla issue 22589. */
+	ldr	r1, =console_\_driver\()_putc
+	str	r1, [r0, #CONSOLE_T_PUTC]
+	ldr	r1, =console_\_driver\()_getc
+	str	r1, [r0, #CONSOLE_T_GETC]
+	ldr	r1, =console_\_driver\()_flush
+	str	r1, [r0, #CONSOLE_T_FLUSH]
+	mov	r1, #(CONSOLE_FLAG_BOOT | CONSOLE_FLAG_CRASH)
+	str	r1, [r0, #CONSOLE_T_FLAGS]
+	b	console_register
+	.endm
+
+#endif /* __CONSOLE_MACROS_S__ */