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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>
267 lines
7.5 KiB
ArmAsm
267 lines
7.5 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: 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, 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_16550_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 w1, w2, #0xff /* w1 = DLL */
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lsr w2, w2, #8
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and w2, w2, #0xff /* w2 = DLLM */
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ldr w3, [x0, #UARTLCR]
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orr w3, w3, #UARTLCR_DLAB
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str w3, [x0, #UARTLCR] /* enable DLL, DLLM programming */
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str w1, [x0, #UARTDLL] /* program DLL */
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str w2, [x0, #UARTDLLM] /* program DLLM */
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mov w2, #~UARTLCR_DLAB
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and w3, w3, w2
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str w3, [x0, #UARTLCR] /* disable DLL, DLLM programming */
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/* 8n1 */
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mov w3, #3
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str w3, [x0, #UARTLCR]
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/* no interrupt */
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mov w3, #0
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str w3, [x0, #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 w3, [x0, #UARTMDR1]
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#endif /* TI_16550_MDR_QUIRK */
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/* enable fifo, DMA */
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mov w3, #(UARTFCR_FIFOEN | UARTFCR_DMAEN)
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str w3, [x0, #UARTFCR]
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/* DTR + RTS */
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mov w3, #3
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str w3, [x0, #UARTMCR]
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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_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 w1 (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. w2 is ignored then as well.
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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 (ignored if w1 is 0)
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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_16550_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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/* A clock rate of zero means to skip the initialisation. */
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cbz w1, register_16550
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bl console_16550_core_init
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cbz x0, register_fail
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register_16550:
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mov x0, x6
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mov x30, x7
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finish_console_register 16550 putc=1, getc=1, flush=1
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register_fail:
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ret x7
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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 : 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_16550_core_putc
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#if ENABLE_ASSERTIONS
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cmp x1, #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 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, #UARTLSR]
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and w2, w2, #(UARTLSR_TEMT | UARTLSR_THRE)
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cmp w2, #(UARTLSR_TEMT | UARTLSR_THRE)
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b.ne 1b
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mov w2, #0xD /* '\r' */
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str w2, [x1, #UARTTX]
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/* Check if the transmit FIFO is full */
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2: ldr w2, [x1, #UARTLSR]
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and w2, w2, #(UARTLSR_TEMT | UARTLSR_THRE)
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cmp w2, #(UARTLSR_TEMT | UARTLSR_THRE)
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b.ne 2b
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str w0, [x1, #UARTTX]
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ret
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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 : 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_16550_putc
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#if ENABLE_ASSERTIONS
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cmp x1, #0
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ASM_ASSERT(ne)
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#endif /* ENABLE_ASSERTIONS */
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ldr x1, [x1, #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 : x0 - console base address
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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_16550_core_getc
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#if ENABLE_ASSERTIONS
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cmp x0, #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 w1, [x0, #UARTLSR]
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tbz w1, #UARTLSR_RDR_BIT, no_char
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ldr w0, [x0, #UARTRX]
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ret
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no_char:
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mov w0, #ERROR_NO_PENDING_CHAR
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ret
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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 : x0 - pointer to console_t stucture
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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_16550_getc
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#if ENABLE_ASSERTIONS
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cmp x1, #0
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ASM_ASSERT(ne)
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#endif /* ENABLE_ASSERTIONS */
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ldr x0, [x0, #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 : 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_16550_core_flush
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#if ENABLE_ASSERTIONS
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cmp x0, #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 w1, [x0, #UARTLSR]
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and w1, w1, #(UARTLSR_TEMT | UARTLSR_THRE)
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cmp w1, #(UARTLSR_TEMT | UARTLSR_THRE)
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b.ne 1b
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ret
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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 : 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_16550_flush
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#if ENABLE_ASSERTIONS
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cmp x0, #0
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ASM_ASSERT(ne)
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#endif /* ENABLE_ASSERTIONS */
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ldr x0, [x0, #CONSOLE_T_BASE]
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b console_16550_core_flush
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endfunc console_16550_flush
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