blob: bccc5e5ddcb328dd25ad28605c7776214f371fd8 [file] [log] [blame]
/*
* Copyright (c) 2021-2023, Stephan Gerhold <stephan@gerhold.net>
*
* SPDX-License-Identifier: BSD-3-Clause
*/
#include <arch.h>
#include <asm_macros.S>
#include <msm8916_mmap.h>
#define APCS_TCM_START_ADDR 0x10
#define APCS_TCM_REDIRECT_EN_0 BIT_32(0)
.globl plat_crash_console_init
.globl plat_crash_console_putc
.globl plat_crash_console_flush
.globl plat_panic_handler
.globl plat_my_core_pos
.globl plat_get_my_entrypoint
.globl plat_reset_handler
.globl platform_mem_init
.globl msm8916_entry_point
/* -------------------------------------------------
* int plat_crash_console_init(void)
* Initialize the crash console.
* Out: x0 - 1 on success, 0 on error
* Clobber list : x0 - x4
* -------------------------------------------------
*/
func plat_crash_console_init
mov_imm x1, BLSP_UART_BASE
mov x0, #1
b console_uartdm_core_init
endfunc plat_crash_console_init
/* -------------------------------------------------
* int plat_crash_console_putc(int c)
* Print a character on the crash console.
* In : w0 - character to be printed
* Out: w0 - printed character on success
* Clobber list : x1, x2
* -------------------------------------------------
*/
func plat_crash_console_putc
mov_imm x1, BLSP_UART_BASE
b console_uartdm_core_putc
endfunc plat_crash_console_putc
/* -------------------------------------------------
* void plat_crash_console_flush(void)
* Force a write of all buffered data that has not
* been output.
* Clobber list : x1, x2
* -------------------------------------------------
*/
func plat_crash_console_flush
mov_imm x1, BLSP_UART_BASE
b console_uartdm_core_flush
endfunc plat_crash_console_flush
/* -------------------------------------------------
* void plat_panic_handler(void) __dead
* Called when an unrecoverable error occurs.
* -------------------------------------------------
*/
func plat_panic_handler
/* Try to shutdown/reset */
mov_imm x0, MPM_PS_HOLD
str wzr, [x0]
1: b 1b
endfunc plat_panic_handler
/* -------------------------------------------------
* unsigned int plat_my_core_pos(void)
* Out: x0 - index of the calling CPU
* -------------------------------------------------
*/
func plat_my_core_pos
/* There is just a single cluster so this is very simple */
mrs x0, mpidr_el1
and x0, x0, #MPIDR_CPU_MASK
ret
endfunc plat_my_core_pos
/* -------------------------------------------------
* uintptr_t plat_get_my_entrypoint(void)
* Distinguish cold and warm boot and return warm boot
* entry address if available.
* Out: x0 - warm boot entry point or 0 on cold boot
* -------------------------------------------------
*/
func plat_get_my_entrypoint
ldr x0, msm8916_entry_point
cbz x0, 1f
ret
1:
/*
* Cold boot: Disable TCM redirect to L2 cache as early as
* possible to avoid crashes when making use of the cache.
*/
mov_imm x1, APCS_CFG
ldr w2, [x1, #APCS_TCM_START_ADDR]
and w2, w2, #~APCS_TCM_REDIRECT_EN_0
str w2, [x1, #APCS_TCM_START_ADDR]
/*
* After reset the CPU always starts executing at the fixed reset
* address (0x0), which does not match the link address of BL31.
* The "boot remapper" redirects all memory accesses to the real
* physical address in DRAM.
*
* For warm boots, this is already handled by loading the real
* entry point address above.
*
* For cold boots, check if the CPU is using the boot remapper,
* i.e. if bl31_entrypoint appears to be at the reset address (0x0).
*/
adr x1, bl31_entrypoint
cbnz x1, 2f
/*
* Add the real BL31_BASE offset to the return address in the link
* register so the CPU will continue at the real address after return.
*/
mov_imm x1, BL31_BASE
add lr, lr, x1
2:
ret
endfunc plat_get_my_entrypoint
/* -------------------------------------------------
* void platform_mem_init(void)
* Performs additional memory initialization early
* in the boot process.
* -------------------------------------------------
*/
func platform_mem_init
/* Nothing to do here, all memory is already initialized */
ret
endfunc platform_mem_init
.data
.align 3
/* -------------------------------------------------
* Warm boot entry point for CPU. Set by PSCI code.
* -------------------------------------------------
*/
msm8916_entry_point:
.quad 0