mirror of
https://github.com/AsahiLinux/u-boot
synced 2024-12-05 02:51:00 +00:00
429fa25e17
The debug UART is intended for use very early in U-Boot to debug problems before serial drivers are up. Call debug_uart_init right before board_init_f. Signed-off-by: Eugeniy Paltsev <Eugeniy.Paltsev@synopsys.com> Signed-off-by: Alexey Brodkin <abrodkin@synopsys.com>
115 lines
2.7 KiB
ArmAsm
115 lines
2.7 KiB
ArmAsm
/* SPDX-License-Identifier: GPL-2.0+ */
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/*
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* Copyright (C) 2013-2014 Synopsys, Inc. All rights reserved.
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*/
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#include <asm-offsets.h>
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#include <config.h>
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#include <linux/linkage.h>
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#include <asm/arcregs.h>
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ENTRY(_start)
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/* Setup interrupt vector base that matches "__text_start" */
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sr __ivt_start, [ARC_AUX_INTR_VEC_BASE]
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; Disable/enable I-cache according to configuration
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lr r5, [ARC_BCR_IC_BUILD]
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breq r5, 0, 1f ; I$ doesn't exist
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lr r5, [ARC_AUX_IC_CTRL]
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#ifndef CONFIG_SYS_ICACHE_OFF
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bclr r5, r5, 0 ; 0 - Enable, 1 is Disable
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#else
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bset r5, r5, 0 ; I$ exists, but is not used
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#endif
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sr r5, [ARC_AUX_IC_CTRL]
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mov r5, 1
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sr r5, [ARC_AUX_IC_IVIC]
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; As per ARC HS databook (see chapter 5.3.3.2)
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; it is required to add 3 NOPs after each write to IC_IVIC.
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nop
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nop
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nop
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1:
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; Disable/enable D-cache according to configuration
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lr r5, [ARC_BCR_DC_BUILD]
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breq r5, 0, 1f ; D$ doesn't exist
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lr r5, [ARC_AUX_DC_CTRL]
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bclr r5, r5, 6 ; Invalidate (discard w/o wback)
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#ifndef CONFIG_SYS_DCACHE_OFF
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bclr r5, r5, 0 ; Enable (+Inv)
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#else
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bset r5, r5, 0 ; Disable (+Inv)
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#endif
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sr r5, [ARC_AUX_DC_CTRL]
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mov r5, 1
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sr r5, [ARC_AUX_DC_IVDC]
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1:
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#ifdef CONFIG_ISA_ARCV2
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; Disable System-Level Cache (SLC)
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lr r5, [ARC_BCR_SLC]
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breq r5, 0, 1f ; SLC doesn't exist
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lr r5, [ARC_AUX_SLC_CTRL]
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bclr r5, r5, 6 ; Invalidate (discard w/o wback)
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bclr r5, r5, 0 ; Enable (+Inv)
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sr r5, [ARC_AUX_SLC_CTRL]
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1:
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#endif
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/* Establish C runtime stack and frame */
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mov %sp, CONFIG_SYS_INIT_SP_ADDR
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mov %fp, %sp
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/* Allocate reserved area from current top of stack */
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mov %r0, %sp
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bl board_init_f_alloc_reserve
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/* Set stack below reserved area, adjust frame pointer accordingly */
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mov %sp, %r0
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mov %fp, %sp
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/* Initialize reserved area - note: r0 already contains address */
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bl board_init_f_init_reserve
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#ifdef CONFIG_DEBUG_UART
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/* Earliest point to set up early debug uart */
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bl debug_uart_init
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#endif
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/* Zero the one and only argument of "board_init_f" */
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mov_s %r0, 0
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bl board_init_f
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/* We only get here if relocation is disabled by GD_FLG_SKIP_RELOC */
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/* Make sure we don't lose GD overwritten by zero new GD */
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mov %r0, %r25
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mov %r1, 0
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bl board_init_r
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ENDPROC(_start)
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/*
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* void board_init_f_r_trampoline(stack-pointer address)
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*
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* This "function" does not return, instead it continues in RAM
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* after relocating the monitor code.
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*
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* r0 = new stack-pointer
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*/
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ENTRY(board_init_f_r_trampoline)
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/* Set up the stack- and frame-pointers */
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mov %sp, %r0
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mov %fp, %sp
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/* Update position of intterupt vector table */
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lr %r0, [ARC_AUX_INTR_VEC_BASE]
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ld %r1, [%r25, GD_RELOC_OFF]
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add %r0, %r0, %r1
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sr %r0, [ARC_AUX_INTR_VEC_BASE]
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/* Re-enter U-Boot by calling board_init_f_r */
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j board_init_f_r
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ENDPROC(board_init_f_r_trampoline)
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