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https://github.com/ARM-software/arm-trusted-firmware.git
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af1e8fda23
Since now the generic console_t structure holds the UART base address as well, let's use that generic location and drop the UART driver specific data structure at all. Change-Id: Ia9d996bb45ff3a7f1b240f12fd75805b48a048e9 Signed-off-by: Andre Przywara <andre.przywara@arm.com>
66 lines
1.4 KiB
ArmAsm
66 lines
1.4 KiB
ArmAsm
/*
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* Copyright (c) 2017-2019, ARM Limited and Contributors. All rights reserved.
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*
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* SPDX-License-Identifier: BSD-3-Clause
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*/
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#include <asm_macros.S>
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#include <drivers/console.h>
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#include "uniphier_console.h"
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/*
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* In: w0 - character to be printed
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* x1 - pointer to console structure
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* Out: return the character written (always succeeds)
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* Clobber: x2
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*/
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.globl uniphier_console_putc
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func uniphier_console_putc
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ldr x1, [x1, #CONSOLE_T_BASE]
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/* Wait until the transmitter FIFO gets empty */
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0: ldr w2, [x1, #UNIPHIER_UART_LSR]
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tbz w2, #UNIPHIER_UART_LSR_THRE_BIT, 0b
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str w0, [x1, #UNIPHIER_UART_TX]
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ret
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endfunc uniphier_console_putc
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/*
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* In: x0 - pointer to console structure
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* Out: return the character read, or ERROR_NO_PENDING_CHAR if no character
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is available
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* Clobber: x1
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*/
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.globl uniphier_console_getc
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func uniphier_console_getc
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ldr x0, [x0, #CONSOLE_T_BASE]
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ldr w1, [x0, #UNIPHIER_UART_LSR]
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tbz w1, #UNIPHIER_UART_LSR_DR_BIT, 0f
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ldr w0, [x0, #UNIPHIER_UART_RX]
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ret
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0: mov w0, #ERROR_NO_PENDING_CHAR
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ret
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endfunc uniphier_console_getc
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/*
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* In: x0 - pointer to console structure
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* Out: return 0 (always succeeds)
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* Clobber: x1
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*/
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.global uniphier_console_flush
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func uniphier_console_flush
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ldr x0, [x0, #CONSOLE_T_BASE]
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/* wait until the transmitter gets empty */
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0: ldr w1, [x0, #UNIPHIER_UART_LSR]
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tbz w1, #UNIPHIER_UART_LSR_TEMT_BIT, 0b
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mov w0, #0
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ret
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endfunc uniphier_console_flush
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