You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
253 lines
6.7 KiB
253 lines
6.7 KiB
/*
|
|
* Copyright (c) 2018, ARM Limited and Contributors. All rights reserved.
|
|
*
|
|
* SPDX-License-Identifier: BSD-3-Clause
|
|
*/
|
|
#include <asm_macros.S>
|
|
#include <assert_macros.S>
|
|
#include <console_macros.S>
|
|
#include <drivers/st/stm32_console.h>
|
|
#include <drivers/st/stm32_uart_regs.h>
|
|
|
|
#define USART_TIMEOUT 0x1000
|
|
|
|
/*
|
|
* "core" functions are low-level implementations that don't require
|
|
* writeable memory and are thus safe to call in BL1 crash context.
|
|
*/
|
|
.globl console_stm32_core_init
|
|
.globl console_stm32_core_putc
|
|
.globl console_stm32_core_getc
|
|
.globl console_stm32_core_flush
|
|
|
|
.globl console_stm32_putc
|
|
.globl console_stm32_flush
|
|
|
|
|
|
|
|
/* -----------------------------------------------------------------
|
|
* int console_core_init(uintptr_t base_addr,
|
|
* unsigned int uart_clk,
|
|
* unsigned int baud_rate)
|
|
*
|
|
* Function to initialize the console without a C Runtime to print
|
|
* debug information. This function will be accessed by console_init
|
|
* and crash reporting.
|
|
*
|
|
* In: r0 - console base address
|
|
* r1 - Uart clock in Hz
|
|
* r2 - Baud rate
|
|
* Out: return 1 on success else 0 on error
|
|
* Clobber list : r1, r2, r3
|
|
* -----------------------------------------------------------------
|
|
*/
|
|
func console_stm32_core_init
|
|
/* Check the input base address */
|
|
cmp r0, #0
|
|
beq core_init_fail
|
|
#if defined(IMAGE_BL2)
|
|
/* Check baud rate and uart clock for sanity */
|
|
cmp r1, #0
|
|
beq core_init_fail
|
|
cmp r2, #0
|
|
beq core_init_fail
|
|
/* Disable UART */
|
|
ldr r3, [r0, #USART_CR1]
|
|
bic r3, r3, #USART_CR1_UE
|
|
str r3, [r0, #USART_CR1]
|
|
/* Configure UART */
|
|
orr r3, r3, #(USART_CR1_TE | USART_CR1_FIFOEN)
|
|
str r3, [r0, #USART_CR1]
|
|
ldr r3, [r0, #USART_CR2]
|
|
bic r3, r3, #USART_CR2_STOP
|
|
str r3, [r0, #USART_CR2]
|
|
/* Divisor = (Uart clock + (baudrate / 2)) / baudrate */
|
|
lsl r3, r2, #1
|
|
add r3, r1, r3
|
|
udiv r3, r3, r2
|
|
str r3, [r0, #USART_BRR]
|
|
/* Enable UART */
|
|
ldr r3, [r0, #USART_CR1]
|
|
orr r3, r3, #USART_CR1_UE
|
|
str r3, [r0, #USART_CR1]
|
|
/* Check TEACK bit */
|
|
mov r2, #USART_TIMEOUT
|
|
teack_loop:
|
|
subs r2, r2, #1
|
|
beq core_init_fail
|
|
ldr r3, [r0, #USART_ISR]
|
|
tst r3, #USART_ISR_TEACK
|
|
beq teack_loop
|
|
#endif /* IMAGE_BL2 */
|
|
mov r0, #1
|
|
bx lr
|
|
core_init_fail:
|
|
mov r0, #0
|
|
bx lr
|
|
endfunc console_stm32_core_init
|
|
|
|
.globl console_stm32_register
|
|
|
|
/* -------------------------------------------------------
|
|
* int console_stm32_register(uintptr_t baseaddr,
|
|
* uint32_t clock, uint32_t baud,
|
|
* struct console_stm32 *console);
|
|
* Function to initialize and register a new STM32
|
|
* console. Storage passed in for the console struct
|
|
* *must* be persistent (i.e. not from the stack).
|
|
* In: r0 - UART register base address
|
|
* r1 - UART clock in Hz
|
|
* r2 - Baud rate
|
|
* r3 - pointer to empty console_stm32 struct
|
|
* Out: return 1 on success, 0 on error
|
|
* Clobber list : r0, r1, r2
|
|
* -------------------------------------------------------
|
|
*/
|
|
func console_stm32_register
|
|
push {r4, lr}
|
|
mov r4, r3
|
|
cmp r4, #0
|
|
beq register_fail
|
|
str r0, [r4, #CONSOLE_T_STM32_BASE]
|
|
|
|
bl console_stm32_core_init
|
|
cmp r0, #0
|
|
beq register_fail
|
|
|
|
mov r0, r4
|
|
pop {r4, lr}
|
|
finish_console_register stm32 putc=1, getc=0, flush=1
|
|
|
|
register_fail:
|
|
pop {r4, pc}
|
|
endfunc console_stm32_register
|
|
|
|
/* ---------------------------------------------------------------
|
|
* int console_core_putc(int c, uintptr_t base_addr)
|
|
*
|
|
* Function to output a character over the console. It returns the
|
|
* character printed on success or -1 on error.
|
|
*
|
|
* In : r0 - character to be printed
|
|
* r1 - console base address
|
|
* Out : return -1 on error else return character.
|
|
* Clobber list : r2
|
|
* ---------------------------------------------------------------
|
|
*/
|
|
func console_stm32_core_putc
|
|
/* Check the input parameter */
|
|
cmp r1, #0
|
|
beq putc_error
|
|
/* Prepend '\r' to '\n' */
|
|
cmp r0, #0xA
|
|
bne 2f
|
|
1:
|
|
/* Check Transmit Data Register Empty */
|
|
txe_loop_1:
|
|
ldr r2, [r1, #USART_ISR]
|
|
tst r2, #USART_ISR_TXE
|
|
beq txe_loop_1
|
|
mov r2, #0xD
|
|
str r2, [r1, #USART_TDR]
|
|
/* Check transmit complete flag */
|
|
tc_loop_1:
|
|
ldr r2, [r1, #USART_ISR]
|
|
tst r2, #USART_ISR_TC
|
|
beq tc_loop_1
|
|
2:
|
|
/* Check Transmit Data Register Empty */
|
|
txe_loop_2:
|
|
ldr r2, [r1, #USART_ISR]
|
|
tst r2, #USART_ISR_TXE
|
|
beq txe_loop_2
|
|
str r0, [r1, #USART_TDR]
|
|
/* Check transmit complete flag */
|
|
tc_loop_2:
|
|
ldr r2, [r1, #USART_ISR]
|
|
tst r2, #USART_ISR_TC
|
|
beq tc_loop_2
|
|
bx lr
|
|
putc_error:
|
|
mov r0, #-1
|
|
bx lr
|
|
endfunc console_stm32_core_putc
|
|
|
|
/* ------------------------------------------------------------
|
|
* int console_stm32_putc(int c, struct console_stm32 *console)
|
|
* Function to output a character over the console. It
|
|
* returns the character printed on success or -1 on error.
|
|
* In: r0 - character to be printed
|
|
* r1 - pointer to console_t structure
|
|
* Out : return -1 on error else return character.
|
|
* Clobber list: r2
|
|
* ------------------------------------------------------------
|
|
*/
|
|
func console_stm32_putc
|
|
#if ENABLE_ASSERTIONS
|
|
cmp r1, #0
|
|
ASM_ASSERT(ne)
|
|
#endif /* ENABLE_ASSERTIONS */
|
|
ldr r1, [r1, #CONSOLE_T_STM32_BASE]
|
|
b console_stm32_core_putc
|
|
endfunc console_stm32_putc
|
|
|
|
/* -----------------------------------------------------------
|
|
* int console_core_getc(uintptr_t base_addr)
|
|
*
|
|
* Function to get a character from the console.
|
|
* It returns the character grabbed on success or -1 on error.
|
|
*
|
|
* In : r0 - console base address
|
|
* Out : return -1.
|
|
* Clobber list : r0, r1
|
|
* -----------------------------------------------------------
|
|
*/
|
|
func console_stm32_core_getc
|
|
/* Not supported */
|
|
mov r0, #-1
|
|
bx lr
|
|
endfunc console_stm32_core_getc
|
|
|
|
/* ---------------------------------------------------------------
|
|
* int console_core_flush(uintptr_t base_addr)
|
|
*
|
|
* Function to force a write of all buffered data that hasn't been
|
|
* output.
|
|
*
|
|
* In : r0 - console base address
|
|
* Out : return -1 on error else return 0.
|
|
* Clobber list : r0, r1
|
|
* ---------------------------------------------------------------
|
|
*/
|
|
func console_stm32_core_flush
|
|
cmp r0, #0
|
|
beq flush_error
|
|
/* Check Transmit Data Register Empty */
|
|
txe_loop_3:
|
|
ldr r1, [r0, #USART_ISR]
|
|
tst r1, #USART_ISR_TXE
|
|
beq txe_loop_3
|
|
mov r0, #0
|
|
bx lr
|
|
flush_error:
|
|
mov r0, #-1
|
|
bx lr
|
|
endfunc console_stm32_core_flush
|
|
|
|
/* ------------------------------------------------------
|
|
* int console_stm32_flush(struct console_stm32 *console)
|
|
* Function to force a write of all buffered
|
|
* data that hasn't been output.
|
|
* In : r0 - pointer to console_t structure
|
|
* Out : return -1 on error else return 0.
|
|
* Clobber list: r0, r1
|
|
* ------------------------------------------------------
|
|
*/
|
|
func console_stm32_flush
|
|
#if ENABLE_ASSERTIONS
|
|
cmp r0, #0
|
|
ASM_ASSERT(ne)
|
|
#endif /* ENABLE_ASSERTIONS */
|
|
ldr r0, [r0, #CONSOLE_T_STM32_BASE]
|
|
b console_stm32_core_flush
|
|
endfunc console_stm32_flush
|
|
|