drivers: dummy_console: Add dummy console driver
Placeholder driver with empty functions.
Change-Id: I50accca77995c642c7b920bdc1b7d936e7883313
Signed-off-by: Antonio Nino Diaz <antonio.ninodiaz@arm.com>
diff --git a/drivers/console/aarch64/dummy_console.S b/drivers/console/aarch64/dummy_console.S
new file mode 100644
index 0000000..50ac196
--- /dev/null
+++ b/drivers/console/aarch64/dummy_console.S
@@ -0,0 +1,93 @@
+/*
+ * Copyright (c) 2018-2019, Arm Limited. All rights reserved.
+ *
+ * SPDX-License-Identifier: BSD-3-Clause
+ */
+
+#include <asm_macros.S>
+#include <drivers/console.h>
+
+ .globl console_init
+ .globl console_putc
+ .globl console_getc
+ .globl console_try_getc
+ .globl console_flush
+
+ /* -----------------------------------------------
+ * int console_init(uintptr_t base_addr,
+ * unsigned int uart_clk, unsigned int baud_rate)
+ * Function to initialize the console without a
+ * C Runtime to print debug information. It saves
+ * the console base to the data section.
+ * In: x0 - Console base address
+ * w1 - Uart clock in Hz
+ * w2 - Baud rate
+ * Out: w0 - Return 1 on success, 0 on error.
+ * Clobber list : x1 - x3
+ * -----------------------------------------------
+ */
+func console_init
+ mov w0, #1
+ ret
+endfunc console_init
+
+ /* ---------------------------------------------
+ * int console_putc(int c)
+ * Function to output a character over the
+ * console. It returns the character printed on
+ * success or an error code.
+ * In : x0 - Character to be printed
+ * Out : w0 - Input character or error code.
+ * Clobber list : x1, x2
+ * ---------------------------------------------
+ */
+func console_putc
+ /* Return the printed characted, which is in x0 */
+ ret
+endfunc console_putc
+
+ /* ---------------------------------------------
+ * int console_getc(void)
+ * Function to get a character from the console.
+ * It returns the character grabbed on success
+ * or an error code on error. This function is
+ * blocking, it waits until there is an
+ * available character to return.
+ * Out : w0 - Return character or error code.
+ * Clobber list : x0 - x3
+ * ---------------------------------------------
+ */
+func console_getc
+ mov w0, #ERROR_NO_VALID_CONSOLE
+ ret
+endfunc console_getc
+
+ /* ---------------------------------------------
+ * int console_try_getc(void)
+ * Function to get a character from the console.
+ * It returns the character grabbed on success
+ * or an error code on error. This function is
+ * non-blocking, it returns immediately.
+ * Out : w0 - Return character or error code.
+ * Clobber list : x0, x1
+ * ---------------------------------------------
+ */
+func console_try_getc
+ mov w0, #ERROR_NO_PENDING_CHAR
+ ret
+endfunc console_try_getc
+
+ /* ---------------------------------------------
+ * int console_flush(void)
+ * Function to force a write of all buffered
+ * data that hasn't been output. It returns 0
+ * upon successful completion, otherwise it
+ * returns an error code.
+ * Out: w0 - Error code or 0.
+ * Clobber list : x0, x1
+ * ---------------------------------------------
+ */
+func console_flush
+ mov w0, #0
+ ret
+endfunc console_flush