2015-04-13 07:47:57 +01:00
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/*
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2017-02-08 15:58:12 +00:00
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* Copyright (c) 2015-2017, ARM Limited and Contributors. All rights reserved.
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2015-04-13 07:47:57 +01:00
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*
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2017-05-03 09:38:09 +01:00
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* SPDX-License-Identifier: BSD-3-Clause
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2015-04-13 07:47:57 +01:00
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*/
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#include <asm_macros.S>
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#include <uart8250.h>
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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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2017-02-08 15:58:12 +00:00
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.globl console_core_flush
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2015-04-13 07:47:57 +01:00
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/* -----------------------------------------------
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* int console_core_init(unsigned long 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
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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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/* 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 interrupt */
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str wzr, [x0, #UART_IER]
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/* Force DTR and RTS to high */
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mov w3, #(UART_MCR_DTR | UART_MCR_RTS)
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str w3, [x0, #UART_MCR]
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/* Check high speed */
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movz w3, #:abs_g1:115200
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movk w3, #:abs_g0_nc:115200
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cmp w2, w3
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b.hi 1f
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/* Non high speed */
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lsl w2, w2, #4
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mov w3, wzr
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b 2f
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/* High speed */
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1: lsl w2, w2, #2
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mov w3, #2
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/* Set high speed UART register */
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2: str w3, [x0, #UART_HIGHSPEED]
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/* Calculate divisor */
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udiv w3, w1, w2 /* divisor = uartclk / (quot * baudrate) */
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msub w1, w3, w2, w1 /* remainder = uartclk % (quot * baudrate) */
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lsr w2, w2, #1
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cmp w1, w2
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cinc w3, w3, hs
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/* Set line configuration, access divisor latches */
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mov w1, #(UART_LCR_DLAB | UART_LCR_WLS_8)
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str w1, [x0, #UART_LCR]
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/* Set the divisor */
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and w1, w3, #0xff
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str w1, [x0, #UART_DLL]
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lsr w1, w3, #8
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and w1, w1, #0xff
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str w1, [x0, #UART_DLH]
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/* Hide the divisor latches */
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mov w1, #UART_LCR_WLS_8
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str w1, [x0, #UART_LCR]
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/* Enable FIFOs, and clear receive and transmit */
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mov w1, #(UART_FCR_FIFO_EN | UART_FCR_CLEAR_RCVR | \
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UART_FCR_CLEAR_XMIT)
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str w1, [x0, #UART_FCR]
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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, unsigned long 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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/* Check if the transmit FIFO is full */
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1: ldr w2, [x1, #UART_LSR]
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and w2, w2, #UART_LSR_THRE
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cbz w2, 1b
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mov w2, #0xD
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str w2, [x1, #UART_THR]
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/* Check if the transmit FIFO is full */
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2: ldr w2, [x1, #UART_LSR]
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and w2, w2, #UART_LSR_THRE
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cbz w2, 2b
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str w0, [x1, #UART_THR]
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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(unsigned long 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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/* Check if the receive FIFO is empty */
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1: ldr w1, [x0, #UART_LSR]
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tbz w1, #UART_LSR_DR, 1b
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ldr w0, [x0, #UART_RBR]
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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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2017-02-08 15:58:12 +00:00
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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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/* Placeholder */
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mov w0, #0
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ret
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endfunc console_core_flush
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