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https://github.com/ARM-software/arm-trusted-firmware.git
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831b0e9824
And from crash_console_flush. We ignore the error information return by console_flush in _every_ place where we call it, and casting the return type to void does not work around the MISRA violation that this causes. Instead, we collect the error information from the driver (to avoid changing that API), and don't return it to the caller. Change-Id: I1e35afe01764d5c8f0efd04f8949d333ffb688c1 Signed-off-by: Jimmy Brisson <jimmy.brisson@arm.com>
251 lines
6.6 KiB
ArmAsm
251 lines
6.6 KiB
ArmAsm
/*
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* Copyright (C) 2016 Marvell International Ltd.
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*
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* SPDX-License-Identifier: BSD-3-Clause
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* https://spdx.org/licenses
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*/
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#include <arch.h>
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#include <asm_macros.S>
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#include <console_macros.S>
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#include <drivers/marvell/uart/a3700_console.h>
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/*
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* "core" functions are low-level implementations that don't require
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* writable memory and are thus safe to call in BL1 crash context.
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*/
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.globl console_a3700_core_putc
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.globl console_a3700_core_init
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.globl console_a3700_core_getc
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.globl console_a3700_core_flush
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.globl console_a3700_putc
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.globl console_a3700_getc
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.globl console_a3700_flush
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/* -----------------------------------------------
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* int console_a3700_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
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* Clobber list : x1, x2, x3
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* -----------------------------------------------
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*/
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func console_a3700_core_init
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/* Check the input base address */
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cbz x0, init_fail
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/* Check baud rate and uart clock for sanity */
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cbz w1, init_fail
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cbz w2, init_fail
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/* Program the baudrate */
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/* Divisor = Uart clock / (16 * baudrate) */
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lsl w2, w2, #4
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udiv w2, w1, w2
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and w2, w2, #0x3ff
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ldr w3, [x0, #UART_BAUD_REG]
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bic w3, w3, 0x3ff
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orr w3, w3, w2
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str w3, [x0, #UART_BAUD_REG]/* set baud rate divisor */
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/* Set UART to default 16X scheme */
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mov w3, #0
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str w3, [x0, #UART_POSSR_REG]
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/*
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* Wait for the TX FIFO to be empty. If wait for 20ms, the TX FIFO is
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* still not empty, TX FIFO will reset by all means.
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*/
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mov w1, #20 /* max time out 20ms */
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2:
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/* Check whether TX FIFO is empty */
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ldr w3, [x0, #UART_STATUS_REG]
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and w3, w3, #UARTLSR_TXFIFOEMPTY
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cmp w3, #0
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b.ne 4f
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/* Delay */
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mov w2, #30000
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3:
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sub w2, w2, #1
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cmp w2, #0
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b.ne 3b
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/* Check whether 10ms is waited */
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sub w1, w1, #1
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cmp w1, #0
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b.ne 2b
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4:
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/* Reset FIFO */
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mov w3, #UART_CTRL_RXFIFO_RESET
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orr w3, w3, #UART_CTRL_TXFIFO_RESET
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str w3, [x0, #UART_CTRL_REG]
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/* Delay */
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mov w2, #2000
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1:
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sub w2, w2, #1
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cmp w2, #0
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b.ne 1b
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/* No Parity, 1 Stop */
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mov w3, #0
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str w3, [x0, #UART_CTRL_REG]
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mov w0, #1
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ret
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init_fail:
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mov w0, #0
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ret
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endfunc console_a3700_core_init
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.globl console_a3700_register
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/* -----------------------------------------------
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* int console_a3700_register(console_t *console,
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uintptr_t base, uint32_t clk, uint32_t baud)
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* Function to initialize and register a new a3700
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* console. Storage passed in for the console struct
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* *must* be persistent (i.e. not from the stack).
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* In: x0 - UART register base address
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* w1 - UART clock in Hz
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* w2 - Baud rate
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* x3 - pointer to empty console_t struct
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* Out: return 1 on success, 0 on error
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* Clobber list : x0, x1, x2, x6, x7, x14
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* -----------------------------------------------
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*/
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func console_a3700_register
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mov x7, x30
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mov x6, x3
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cbz x6, register_fail
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str x0, [x6, #CONSOLE_T_BASE]
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bl console_a3700_core_init
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cbz x0, register_fail
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mov x0, x6
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mov x30, x7
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finish_console_register a3700, putc=1, getc=1, flush=1
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register_fail:
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ret x7
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endfunc console_a3700_register
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/* --------------------------------------------------------
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* int console_a3700_core_putc(int c, unsigned int 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_a3700_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_STATUS_REG]
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and w2, w2, #UARTLSR_TXFIFOFULL
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cmp w2, #UARTLSR_TXFIFOFULL
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b.eq 1b
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mov w2, #0xD /* '\r' */
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str w2, [x1, #UART_TX_REG]
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/* Check if the transmit FIFO is full */
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2: ldr w2, [x1, #UART_STATUS_REG]
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and w2, w2, #UARTLSR_TXFIFOFULL
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cmp w2, #UARTLSR_TXFIFOFULL
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b.eq 2b
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str w0, [x1, #UART_TX_REG]
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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_a3700_core_putc
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/* --------------------------------------------------------
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* int console_a3700_putc(int c, console_t *console)
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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 - pointer to console_t structure
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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_a3700_putc
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ldr x1, [x1, #CONSOLE_T_BASE]
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b console_a3700_core_putc
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endfunc console_a3700_putc
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/* ---------------------------------------------
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* int console_a3700_core_getc(void)
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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 : w0 - console base address
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* Out : return -1 on error else return character.
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* Clobber list : x0, x1
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* ---------------------------------------------
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*/
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func console_a3700_core_getc
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mov w0, #-1
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ret
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endfunc console_a3700_core_getc
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/* ---------------------------------------------
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* int console_a3700_getc(console_t *console)
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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 if no character is available.
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* In : x0 - pointer to console_t structure
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* Out : w0 - character if available, else -1
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* Clobber list : x0, x1
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* ---------------------------------------------
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*/
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func console_a3700_getc
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ldr x0, [x0, #CONSOLE_T_BASE]
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b console_a3700_core_getc
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endfunc console_a3700_getc
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/* ---------------------------------------------
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* void console_a3700_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 : void.
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* Clobber list : x0, x1
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* ---------------------------------------------
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*/
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func console_a3700_core_flush
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ret
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endfunc console_a3700_core_flush
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/* ---------------------------------------------
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* void console_a3700_flush(console_t *console)
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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 - pointer to console_t structure
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* Out : void.
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* Clobber list : x0, x1
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* ---------------------------------------------
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*/
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func console_a3700_flush
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ldr x0, [x0, #CONSOLE_T_BASE]
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b console_a3700_core_flush
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endfunc console_a3700_flush
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