155 lines
3.9 KiB
ArmAsm
155 lines
3.9 KiB
ArmAsm
/*
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* Copyright (c) 2013-2017, 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 <arch.h>
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#include <asm_macros.S>
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#include <pl011.h>
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/*
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* Pull in generic functions to provide backwards compatibility for
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* platform makefiles
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*/
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#include "../../../console/aarch64/console.S"
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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, x3, x4
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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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#if !PL011_GENERIC_UART
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/* Check baud rate and uart clock for sanity */
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cbz w1, core_init_fail
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cbz w2, core_init_fail
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/* Disable uart before programming */
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ldr w3, [x0, #UARTCR]
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mov w4, #PL011_UARTCR_UARTEN
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bic w3, w3, w4
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str w3, [x0, #UARTCR]
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/* Program the baudrate */
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/* Divisor = (Uart clock * 4) / baudrate */
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lsl w1, w1, #2
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udiv w2, w1, w2
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/* IBRD = Divisor >> 6 */
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lsr w1, w2, #6
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/* Write the IBRD */
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str w1, [x0, #UARTIBRD]
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/* FBRD = Divisor & 0x3F */
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and w1, w2, #0x3f
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/* Write the FBRD */
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str w1, [x0, #UARTFBRD]
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mov w1, #PL011_LINE_CONTROL
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str w1, [x0, #UARTLCR_H]
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/* Clear any pending errors */
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str wzr, [x0, #UARTECR]
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/* Enable tx, rx, and uart overall */
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mov w1, #(PL011_UARTCR_RXE | PL011_UARTCR_TXE | PL011_UARTCR_UARTEN)
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str w1, [x0, #UARTCR]
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#endif
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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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/* Prepend '\r' to '\n' */
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cmp w0, #0xA
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b.ne 2f
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1:
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/* Check if the transmit FIFO is full */
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ldr w2, [x1, #UARTFR]
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tbnz w2, #PL011_UARTFR_TXFF_BIT, 1b
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mov w2, #0xD
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str w2, [x1, #UARTDR]
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2:
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/* Check if the transmit FIFO is full */
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ldr w2, [x1, #UARTFR]
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tbnz w2, #PL011_UARTFR_TXFF_BIT, 2b
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str w0, [x1, #UARTDR]
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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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cbz x0, getc_error
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1:
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/* Check if the receive FIFO is empty */
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ldr w1, [x0, #UARTFR]
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tbnz w1, #PL011_UARTFR_RXFE_BIT, 1b
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ldr w1, [x0, #UARTDR]
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mov w0, w1
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ret
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getc_error:
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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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1:
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/* Loop until the transmit FIFO is empty */
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ldr w1, [x0, #UARTFR]
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tbnz w1, #PL011_UARTFR_BUSY_BIT, 1b
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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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