119 lines
3.1 KiB
ArmAsm
119 lines
3.1 KiB
ArmAsm
/*
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* Copyright (c) 2017, 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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#define CONSOLE_NUM_BYTES_SHIFT 24
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#define CONSOLE_FLUSH_DATA_TO_PORT (1 << 26)
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#define CONSOLE_RING_DOORBELL (1 << 31)
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#define CONSOLE_IS_BUSY (1 << 31)
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#define CONSOLE_WRITE (CONSOLE_RING_DOORBELL | CONSOLE_FLUSH_DATA_TO_PORT)
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/*
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* This file contains a driver implementation to make use of the
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* real console implementation provided by the SPE firmware running
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* SoCs after Tegra186.
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*
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* This console is shared by multiple components and the SPE firmware
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* finally displays everything on the UART port.
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*/
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.globl console_core_init
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.globl console_core_putc
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.globl console_core_getc
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.globl console_core_flush
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/* -----------------------------------------------
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* int console_core_init(uintptr_t base_addr,
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* unsigned int uart_clk, unsigned int baud_rate)
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* Function to initialize the console without a
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* C Runtime to print debug information. This
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* function will be accessed by console_init and
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* crash reporting.
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* In: x0 - console base address
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* w1 - Uart clock in Hz
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* w2 - Baud rate
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* Out: return 1 on success else 0 on error
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* Clobber list : x1, x2
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* -----------------------------------------------
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*/
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func console_core_init
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/* Check the input base address */
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cbz x0, core_init_fail
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mov w0, #1
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ret
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core_init_fail:
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mov w0, wzr
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ret
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endfunc console_core_init
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/* --------------------------------------------------------
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* int console_core_putc(int c, uintptr_t base_addr)
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* Function to output a character over the console. It
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* returns the character printed on success or -1 on error.
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* In : w0 - character to be printed
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* x1 - console base address
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* Out : return -1 on error else return character.
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* Clobber list : x2
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* --------------------------------------------------------
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*/
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func console_core_putc
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/* Check the input parameter */
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cbz x1, putc_error
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/* wait until spe is ready */
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1: ldr w2, [x1]
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and w2, w2, #CONSOLE_IS_BUSY
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cbnz w2, 1b
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/* spe is ready */
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mov w2, w0
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and w2, w2, #0xFF
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mov w3, #(CONSOLE_WRITE | (1 << CONSOLE_NUM_BYTES_SHIFT))
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orr w2, w2, w3
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str w2, [x1]
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ret
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putc_error:
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mov w0, #-1
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ret
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endfunc console_core_putc
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/* ---------------------------------------------
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* int console_core_getc(uintptr_t base_addr)
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* Function to get a character from the console.
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* It returns the character grabbed on success
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* or -1 on error.
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* In : x0 - console base address
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* Clobber list : x0, x1
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* ---------------------------------------------
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*/
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func console_core_getc
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mov w0, #-1
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ret
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endfunc console_core_getc
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/* ---------------------------------------------
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* int console_core_flush(uintptr_t base_addr)
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* Function to force a write of all buffered
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* data that hasn't been output.
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* In : x0 - console base address
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* Out : return -1 on error else return 0.
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* Clobber list : x0, x1
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* ---------------------------------------------
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*/
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func console_core_flush
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cbz x0, flush_error
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/* flush console */
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mov w1, #CONSOLE_WRITE
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str w1, [x0]
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mov w0, #0
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ret
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flush_error:
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mov w0, #-1
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ret
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endfunc console_core_flush
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