/* * Copyright (c) 2015-2020, ARM Limited and Contributors. All rights reserved. * * SPDX-License-Identifier: BSD-3-Clause */ #include #include #include #include #include #define GPIO_TX_SHIFT (DEBUG_UART_TX_GPIO_PORT << 1) #define GPIO_TX_ALT_SHIFT ((DEBUG_UART_TX_GPIO_PORT - GPIO_ALT_LOWER_LIMIT) << 2) .globl platform_mem_init .globl plat_report_exception .globl plat_get_my_entrypoint .globl plat_secondary_cold_boot_setup .globl plat_reset_handler .globl plat_is_my_cpu_primary .globl plat_my_core_pos .globl plat_crash_console_init .globl plat_crash_console_flush .globl plat_crash_console_putc .globl plat_panic_handler func platform_mem_init /* Nothing to do, don't need to init SYSRAM */ bx lr endfunc platform_mem_init func plat_report_exception #if DEBUG mov r8, lr /* Test if an abort occurred */ cmp r0, #MODE32_abt bne undef_inst_lbl ldr r4, =abort_str bl asm_print_str mrs r4, lr_abt sub r4, r4, #4 b print_exception_info undef_inst_lbl: /* Test for an undefined instruction */ cmp r0, #MODE32_und bne other_exception_lbl ldr r4, =undefined_str bl asm_print_str mrs r4, lr_und b print_exception_info other_exception_lbl: /* Other exceptions */ mov r9, r0 ldr r4, =exception_start_str bl asm_print_str mov r4, r9 bl asm_print_hex ldr r4, =exception_end_str bl asm_print_str mov r4, r6 print_exception_info: bl asm_print_hex ldr r4, =end_error_str bl asm_print_str bx r8 #else bx lr #endif endfunc plat_report_exception func plat_reset_handler bx lr endfunc plat_reset_handler /* ------------------------------------------------------------------ * unsigned long plat_get_my_entrypoint (void); * * Main job of this routine is to distinguish between a cold and warm * boot. * * Currently supports only cold boot * ------------------------------------------------------------------ */ func plat_get_my_entrypoint mov r0, #0 bx lr endfunc plat_get_my_entrypoint /* --------------------------------------------- * void plat_secondary_cold_boot_setup (void); * * Cold-booting secondary CPUs is not supported. * --------------------------------------------- */ func plat_secondary_cold_boot_setup b . endfunc plat_secondary_cold_boot_setup /* ----------------------------------------------------- * unsigned int plat_is_my_cpu_primary (void); * * Find out whether the current cpu is the primary cpu. * ----------------------------------------------------- */ func plat_is_my_cpu_primary ldcopr r0, MPIDR ldr r1, =(MPIDR_CLUSTER_MASK | MPIDR_CPU_MASK) and r0, r1 cmp r0, #STM32MP_PRIMARY_CPU moveq r0, #1 movne r0, #0 bx lr endfunc plat_is_my_cpu_primary /* ------------------------------------------- * int plat_stm32mp1_get_core_pos(int mpidr); * * Return CorePos = (ClusterId * 4) + CoreId * ------------------------------------------- */ func plat_stm32mp1_get_core_pos and r1, r0, #MPIDR_CPU_MASK and r0, r0, #MPIDR_CLUSTER_MASK add r0, r1, r0, LSR #6 bx lr endfunc plat_stm32mp1_get_core_pos /* ------------------------------------ * unsigned int plat_my_core_pos(void) * ------------------------------------ */ func plat_my_core_pos ldcopr r0, MPIDR b plat_stm32mp1_get_core_pos endfunc plat_my_core_pos /* --------------------------------------------- * int plat_crash_console_init(void) * * Initialize the crash console without a C Runtime stack. * --------------------------------------------- */ func plat_crash_console_init /* Enable GPIOs for UART TX */ ldr r1, =(RCC_BASE + DEBUG_UART_TX_GPIO_BANK_CLK_REG) ldr r2, [r1] /* Configure GPIO */ orr r2, r2, #DEBUG_UART_TX_GPIO_BANK_CLK_EN str r2, [r1] ldr r1, =DEBUG_UART_TX_GPIO_BANK_ADDRESS /* Set GPIO mode alternate */ ldr r2, [r1, #GPIO_MODE_OFFSET] bic r2, r2, #(GPIO_MODE_MASK << GPIO_TX_SHIFT) orr r2, r2, #(GPIO_MODE_ALTERNATE << GPIO_TX_SHIFT) str r2, [r1, #GPIO_MODE_OFFSET] /* Set GPIO speed low */ ldr r2, [r1, #GPIO_SPEED_OFFSET] bic r2, r2, #(GPIO_SPEED_MASK << GPIO_TX_SHIFT) str r2, [r1, #GPIO_SPEED_OFFSET] /* Set no-pull */ ldr r2, [r1, #GPIO_PUPD_OFFSET] bic r2, r2, #(GPIO_PULL_MASK << GPIO_TX_SHIFT) str r2, [r1, #GPIO_PUPD_OFFSET] /* Set alternate */ ldr r2, [r1, #GPIO_AFRH_OFFSET] bic r2, r2, #(GPIO_ALTERNATE_MASK << GPIO_TX_ALT_SHIFT) orr r2, r2, #(DEBUG_UART_TX_GPIO_ALTERNATE << GPIO_TX_ALT_SHIFT) str r2, [r1, #GPIO_AFRH_OFFSET] /* Enable UART clock, with its source */ ldr r1, =(RCC_BASE + DEBUG_UART_TX_CLKSRC_REG) mov r2, #DEBUG_UART_TX_CLKSRC str r2, [r1] ldr r1, =(RCC_BASE + DEBUG_UART_TX_EN_REG) ldr r2, [r1] orr r2, r2, #DEBUG_UART_TX_EN str r2, [r1] ldr r0, =STM32MP_DEBUG_USART_BASE ldr r1, =STM32MP_DEBUG_USART_CLK_FRQ ldr r2, =STM32MP_UART_BAUDRATE b console_stm32_core_init endfunc plat_crash_console_init /* --------------------------------------------- * int plat_crash_console_flush(void) * * Flush the crash console without a C Runtime stack. * --------------------------------------------- */ func plat_crash_console_flush ldr r1, =STM32MP_DEBUG_USART_BASE b console_stm32_core_flush endfunc plat_crash_console_flush /* --------------------------------------------- * int plat_crash_console_putc(int c) * * Print a character on the crash console without a C Runtime stack. * Clobber list : r1 - r3 * * In case of bootloading through uart, we keep console crash as this. * Characters could be sent to the programmer, but will be ignored. * No specific code in that case. * --------------------------------------------- */ func plat_crash_console_putc ldr r1, =STM32MP_DEBUG_USART_BASE b console_stm32_core_putc endfunc plat_crash_console_putc /* ---------------------------------------------------------- * void plat_panic_handler(void) __dead2; * Report exception + endless loop. * * r6 holds the address where the fault occurred. * Filling lr with this value allows debuggers to reconstruct * the backtrace. * ---------------------------------------------------------- */ func plat_panic_handler mrs r0, cpsr and r0, #MODE32_MASK bl plat_report_exception mov lr, r6 b . endfunc plat_panic_handler #if DEBUG .section .rodata.rev_err_str, "aS" abort_str: .asciz "\nAbort at: 0x" undefined_str: .asciz "\nUndefined instruction at: 0x" exception_start_str: .asciz "\nException mode=0x" exception_end_str: .asciz " at: 0x" end_error_str: .asciz "\n\r" #endif