plat/st/stm32mp1/stm32mp1_helper.S - filogic/atf - Gitiles

 /*
  * Copyright (c) 2015-2020, ARM Limited and Contributors. All rights reserved.
  *
  * SPDX-License-Identifier: BSD-3-Clause
  */

 #include <platform_def.h>

 #include <arch.h>
 #include <asm_macros.S>
 #include <common/bl_common.h>
 #include <drivers/st/stm32_gpio.h>

 #define GPIO_TX_SHIFT		(DEBUG_UART_TX_GPIO_PORT << 1)

 	.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 */
 #if DEBUG_UART_TX_GPIO_PORT >= GPIO_ALT_LOWER_LIMIT
 	ldr	r2, [r1, #GPIO_AFRH_OFFSET]
 	bic	r2, r2, #(GPIO_ALTERNATE_MASK << \
 				((DEBUG_UART_TX_GPIO_PORT - GPIO_ALT_LOWER_LIMIT) << 2))
 	orr	r2, r2, #(DEBUG_UART_TX_GPIO_ALTERNATE << \
 				((DEBUG_UART_TX_GPIO_PORT - GPIO_ALT_LOWER_LIMIT) << 2))
 	str	r2, [r1, #GPIO_AFRH_OFFSET]
 #else
 	ldr	r2, [r1, #GPIO_AFRL_OFFSET]
 	bic	r2, r2, #(GPIO_ALTERNATE_MASK << (DEBUG_UART_TX_GPIO_PORT << 2))
 	orr	r2, r2, #(DEBUG_UART_TX_GPIO_ALTERNATE << (DEBUG_UART_TX_GPIO_PORT << 2))
 	str	r2, [r1, #GPIO_AFRL_OFFSET]
 #endif
 	/* 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
	/*
	* Copyright (c) 2015-2020, ARM Limited and Contributors. All rights reserved.
	*
	* SPDX-License-Identifier: BSD-3-Clause
	*/

	#include <platform_def.h>

	#include <arch.h>
	#include <asm_macros.S>
	#include <common/bl_common.h>
	#include <drivers/st/stm32_gpio.h>

	#define GPIO_TX_SHIFT (DEBUG_UART_TX_GPIO_PORT << 1)

	.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 */
	#if DEBUG_UART_TX_GPIO_PORT >= GPIO_ALT_LOWER_LIMIT
	ldr r2, [r1, #GPIO_AFRH_OFFSET]
	bic r2, r2, #(GPIO_ALTERNATE_MASK << \
	((DEBUG_UART_TX_GPIO_PORT - GPIO_ALT_LOWER_LIMIT) << 2))
	orr r2, r2, #(DEBUG_UART_TX_GPIO_ALTERNATE << \
	((DEBUG_UART_TX_GPIO_PORT - GPIO_ALT_LOWER_LIMIT) << 2))
	str r2, [r1, #GPIO_AFRH_OFFSET]
	#else
	ldr r2, [r1, #GPIO_AFRL_OFFSET]
	bic r2, r2, #(GPIO_ALTERNATE_MASK << (DEBUG_UART_TX_GPIO_PORT << 2))
	orr r2, r2, #(DEBUG_UART_TX_GPIO_ALTERNATE << (DEBUG_UART_TX_GPIO_PORT << 2))
	str r2, [r1, #GPIO_AFRL_OFFSET]
	#endif
	/* 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