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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>
274 lines
7.6 KiB
ArmAsm
274 lines
7.6 KiB
ArmAsm
/*
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* Copyright (c) 2015-2020, 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 <assert_macros.S>
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#include <console_macros.S>
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#include <drivers/ti/uart/uart_16550.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_16550_core_init
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.globl console_16550_core_putc
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.globl console_16550_core_getc
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.globl console_16550_core_flush
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.globl console_16550_putc
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.globl console_16550_getc
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.globl console_16550_flush
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/* -----------------------------------------------
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* int console_16550_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: r0 - console base address
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* r1 - Uart clock in Hz
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* r2 - Baud rate
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* Out: return 1 on success, 0 on error
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* Clobber list : r1, r2, r3
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* -----------------------------------------------
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*/
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func console_16550_core_init
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/* Check the input base address */
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cmp r0, #0
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beq init_fail
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/* Check baud rate and uart clock for sanity */
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cmp r1, #0
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beq init_fail
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cmp r2, #0
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beq init_fail
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/* Program the baudrate */
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/* Divisor = Uart clock / (16 * baudrate) */
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lsl r2, r2, #4
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udiv r2, r1, r2
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and r1, r2, #0xff /* w1 = DLL */
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lsr r2, r2, #8
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and r2, r2, #0xff /* w2 = DLLM */
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ldr r3, [r0, #UARTLCR]
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orr r3, r3, #UARTLCR_DLAB
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str r3, [r0, #UARTLCR] /* enable DLL, DLLM programming */
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str r1, [r0, #UARTDLL] /* program DLL */
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str r2, [r0, #UARTDLLM] /* program DLLM */
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mov r2, #~UARTLCR_DLAB
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and r3, r3, r2
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str r3, [r0, #UARTLCR] /* disable DLL, DLLM programming */
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/* 8n1 */
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mov r3, #3
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str r3, [r0, #UARTLCR]
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/* no interrupt */
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mov r3, #0
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str r3, [r0, #UARTIER]
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#ifdef TI_16550_MDR_QUIRK
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/* UART must be enabled on some platforms via the MDR register */
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str r3, [r0, #UARTMDR1]
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#endif /* TI_16550_MDR_QUIRK */
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/* enable fifo, DMA */
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mov r3, #(UARTFCR_FIFOEN | UARTFCR_DMAEN)
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str r3, [r0, #UARTFCR]
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/* DTR + RTS */
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mov r3, #3
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str r3, [r0, #UARTMCR]
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mov r0, #1
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bx lr
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init_fail:
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mov r0, #0
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bx lr
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endfunc console_16550_core_init
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.globl console_16550_register
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/* -------------------------------------------------------
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* int console_16550_register(uintptr_t baseaddr,
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* uint32_t clock, uint32_t baud,
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* console_t *console);
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* Function to initialize and register a new 16550
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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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* If r1 (UART clock) is 0, initialisation will be
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* skipped, relying on previous code to have done
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* this already. r2 is ignored then as well.
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* In: r0 - UART register base address
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* r1 - UART clock in Hz
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* r2 - Baud rate (ignored if r1 is 0)
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* r3 - pointer to empty console_t struct
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* Out: return 1 on success, 0 on error
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* Clobber list : r0, r1, r2
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* -------------------------------------------------------
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*/
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func console_16550_register
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push {r4, lr}
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mov r4, r3
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cmp r4, #0
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beq register_fail
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str r0, [r4, #CONSOLE_T_BASE]
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/* A clock rate of zero means to skip the initialisation. */
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cmp r1, #0
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beq register_16550
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bl console_16550_core_init
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cmp r0, #0
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beq register_fail
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register_16550:
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mov r0, r4
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pop {r4, lr}
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finish_console_register 16550 putc=1, getc=1, flush=1
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register_fail:
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pop {r4, pc}
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endfunc console_16550_register
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/* --------------------------------------------------------
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* int console_16550_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 : r0 - character to be printed
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* r1 - console base address
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* Out : return -1 on error else return character.
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* Clobber list : r2
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* --------------------------------------------------------
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*/
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func console_16550_core_putc
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#if ENABLE_ASSERTIONS
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cmp r1, #0
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ASM_ASSERT(ne)
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#endif /* ENABLE_ASSERTIONS */
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/* Prepend '\r' to '\n' */
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cmp r0, #0xA
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bne 2f
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/* Check if the transmit FIFO is full */
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1: ldr r2, [r1, #UARTLSR]
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and r2, r2, #(UARTLSR_TEMT | UARTLSR_THRE)
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cmp r2, #(UARTLSR_TEMT | UARTLSR_THRE)
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bne 1b
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mov r2, #0xD /* '\r' */
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str r2, [r1, #UARTTX]
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/* Check if the transmit FIFO is full */
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2: ldr r2, [r1, #UARTLSR]
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and r2, r2, #(UARTLSR_TEMT | UARTLSR_THRE)
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cmp r2, #(UARTLSR_TEMT | UARTLSR_THRE)
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bne 2b
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str r0, [r1, #UARTTX]
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bx lr
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endfunc console_16550_core_putc
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/* --------------------------------------------------------
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* int console_16550_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 : r0 - character to be printed
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* r1 - pointer to console_t structure
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* Out : return -1 on error else return character.
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* Clobber list : r2
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* --------------------------------------------------------
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*/
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func console_16550_putc
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#if ENABLE_ASSERTIONS
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cmp r1, #0
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ASM_ASSERT(ne)
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#endif /* ENABLE_ASSERTIONS */
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ldr r1, [r1, #CONSOLE_T_BASE]
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b console_16550_core_putc
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endfunc console_16550_putc
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/* ---------------------------------------------
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* int console_16550_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 if no character is available.
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* In : r0 - console base address
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* Clobber list : r0, r1
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* ---------------------------------------------
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*/
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func console_16550_core_getc
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#if ENABLE_ASSERTIONS
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cmp r0, #0
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ASM_ASSERT(ne)
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#endif /* ENABLE_ASSERTIONS */
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/* Check if the receive FIFO is empty */
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1: ldr r1, [r0, #UARTLSR]
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tst r1, #UARTLSR_RDR_BIT
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beq no_char
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ldr r1, [r0, #UARTRX]
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mov r0, r1
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bx lr
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no_char:
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mov r0, #ERROR_NO_PENDING_CHAR
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bx lr
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endfunc console_16550_core_getc
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/* ---------------------------------------------
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* int console_16550_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 : r0 - pointer to console_t stucture
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* Out : r0 - character if available, else -1
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* Clobber list : r0, r1
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* ---------------------------------------------
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*/
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func console_16550_getc
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#if ENABLE_ASSERTIONS
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cmp r0, #0
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ASM_ASSERT(ne)
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#endif /* ENABLE_ASSERTIONS */
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ldr r0, [r0, #CONSOLE_T_BASE]
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b console_16550_core_getc
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endfunc console_16550_getc
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/* ---------------------------------------------
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* void console_16550_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 : r0 - console base address
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* Out : void.
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* Clobber list : r0, r1
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* ---------------------------------------------
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*/
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func console_16550_core_flush
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#if ENABLE_ASSERTIONS
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cmp r0, #0
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ASM_ASSERT(ne)
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#endif /* ENABLE_ASSERTIONS */
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/* Loop until the transmit FIFO is empty */
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1: ldr r1, [r0, #UARTLSR]
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and r1, r1, #(UARTLSR_TEMT | UARTLSR_THRE)
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cmp r1, #(UARTLSR_TEMT | UARTLSR_THRE)
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bne 1b
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bx lr
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endfunc console_16550_core_flush
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/* ---------------------------------------------
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* void console_16550_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 : r0 - pointer to console_t structure
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* Out : void
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* Clobber list : r0, r1
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* ---------------------------------------------
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*/
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func console_16550_flush
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#if ENABLE_ASSERTIONS
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cmp r0, #0
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ASM_ASSERT(ne)
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#endif /* ENABLE_ASSERTIONS */
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ldr r0, [r0, #CONSOLE_T_BASE]
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b console_16550_core_flush
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endfunc console_16550_flush
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