diff options
author | Dan Handley <dan.handley@arm.com> | 2015-04-01 16:51:20 +0100 |
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committer | Dan Handley <dan.handley@arm.com> | 2015-04-28 18:57:35 +0100 |
commit | d3b638cb4ac581789737c1a4c86032b00707cb8c (patch) | |
tree | 326d5205cbbe2bd8b5d698390748d9c357068714 /drivers/console/console.S | |
parent | e2bf57f84109f32da5a5bdbfa430d2b81a7fff02 (diff) |
Separate out common console functionality
Separate out the common console functionality in
`drivers/arm/pl011/pl011_console.S` into a new source file
`drivers/console/console.S`. The former includes the latter to
provide backwards compatibility for platform make files.
Also add a skeleton console implementation for platforms that do not
want to use PL011.
Change-Id: I1ff963b2b54a872fbcf1eb0700797b9e9afa2538
Diffstat (limited to 'drivers/console/console.S')
-rw-r--r-- | drivers/console/console.S | 97 |
1 files changed, 97 insertions, 0 deletions
diff --git a/drivers/console/console.S b/drivers/console/console.S new file mode 100644 index 00000000..85c8f658 --- /dev/null +++ b/drivers/console/console.S @@ -0,0 +1,97 @@ +/* + * Copyright (c) 2015, ARM Limited and Contributors. All rights reserved. + * + * Redistribution and use in source and binary forms, with or without + * modification, are permitted provided that the following conditions are met: + * + * Redistributions of source code must retain the above copyright notice, this + * list of conditions and the following disclaimer. + * + * Redistributions in binary form must reproduce the above copyright notice, + * this list of conditions and the following disclaimer in the documentation + * and/or other materials provided with the distribution. + * + * Neither the name of ARM nor the names of its contributors may be used + * to endorse or promote products derived from this software without specific + * prior written permission. + * + * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" + * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE + * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE + * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE + * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR + * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF + * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS + * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN + * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) + * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE + * POSSIBILITY OF SUCH DAMAGE. + */ +#include <asm_macros.S> + + .globl console_init + .globl console_putc + .globl console_getc + + /* + * The console base is in the data section and not in .bss + * even though it is zero-init. In particular, this allows + * the console functions to start using this variable before + * the runtime memory is initialized for images which do not + * need to copy the .data section from ROM to RAM. + */ +.section .data.console_base ; .align 3 + console_base: .quad 0x0 + + /* ----------------------------------------------- + * int console_init(unsigned long 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: return 1 on success else 0 on error + * Clobber list : x1 - x3 + * ----------------------------------------------- + */ +func console_init + /* Check the input base address */ + cbz x0, init_fail + adrp x3, console_base + str x0, [x3, :lo12:console_base] + b console_core_init +init_fail: + 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 -1 on error. + * In : x0 - character to be printed + * Out : return -1 on error else return character. + * Clobber list : x1, x2 + * --------------------------------------------- + */ +func console_putc + adrp x2, console_base + ldr x1, [x2, :lo12:console_base] + b console_core_putc +endfunc console_putc + + /* --------------------------------------------- + * int console_getc(void) + * Function to get a character from the console. + * It returns the character grabbed on success + * or -1 on error. + * Clobber list : x0, x1 + * --------------------------------------------- + */ +func console_getc + adrp x1, console_base + ldr x0, [x1, :lo12:console_base] + b console_core_getc +endfunc console_getc |