| /* |
| * armboot - Startup Code for OMAP3530/ARM Cortex CPU-core |
| * |
| * Copyright (c) 2004 Texas Instruments <r-woodruff2@ti.com> |
| * |
| * Copyright (c) 2001 Marius Gröger <mag@sysgo.de> |
| * Copyright (c) 2002 Alex Züpke <azu@sysgo.de> |
| * Copyright (c) 2002 Gary Jennejohn <garyj@denx.de> |
| * Copyright (c) 2003 Richard Woodruff <r-woodruff2@ti.com> |
| * Copyright (c) 2003 Kshitij <kshitij@ti.com> |
| * Copyright (c) 2006-2008 Syed Mohammed Khasim <x0khasim@ti.com> |
| * Copyright (C) 2016 Freescale Semiconductor, Inc. |
| * |
| * SPDX-License-Identifier: GPL-2.0+ |
| */ |
| |
| #include <asm-offsets.h> |
| #include <config.h> |
| #include <asm/system.h> |
| #include <linux/linkage.h> |
| #include <asm/armv7.h> |
| |
| /************************************************************************* |
| * |
| * Startup Code (reset vector) |
| * |
| * Do important init only if we don't start from memory! |
| * Setup memory and board specific bits prior to relocation. |
| * Relocate armboot to ram. Setup stack. |
| * |
| *************************************************************************/ |
| |
| .globl reset |
| .globl save_boot_params_ret |
| #ifdef CONFIG_ARMV7_LPAE |
| .global switch_to_hypervisor_ret |
| #endif |
| |
| reset: |
| /* Allow the board to save important registers */ |
| b save_boot_params |
| save_boot_params_ret: |
| #ifdef CONFIG_ARMV7_LPAE |
| /* |
| * check for Hypervisor support |
| */ |
| mrc p15, 0, r0, c0, c1, 1 @ read ID_PFR1 |
| and r0, r0, #CPUID_ARM_VIRT_MASK @ mask virtualization bits |
| cmp r0, #(1 << CPUID_ARM_VIRT_SHIFT) |
| beq switch_to_hypervisor |
| switch_to_hypervisor_ret: |
| #endif |
| /* |
| * disable interrupts (FIQ and IRQ), also set the cpu to SVC32 mode, |
| * except if in HYP mode already |
| */ |
| mrs r0, cpsr |
| and r1, r0, #0x1f @ mask mode bits |
| teq r1, #0x1a @ test for HYP mode |
| bicne r0, r0, #0x1f @ clear all mode bits |
| orrne r0, r0, #0x13 @ set SVC mode |
| orr r0, r0, #0xc0 @ disable FIQ and IRQ |
| msr cpsr,r0 |
| |
| /* |
| * Setup vector: |
| * (OMAP4 spl TEXT_BASE is not 32 byte aligned. |
| * Continue to use ROM code vector only in OMAP4 spl) |
| */ |
| #if !(defined(CONFIG_OMAP44XX) && defined(CONFIG_SPL_BUILD)) |
| /* Set V=0 in CP15 SCTLR register - for VBAR to point to vector */ |
| mrc p15, 0, r0, c1, c0, 0 @ Read CP15 SCTLR Register |
| bic r0, #CR_V @ V = 0 |
| mcr p15, 0, r0, c1, c0, 0 @ Write CP15 SCTLR Register |
| |
| /* Set vector address in CP15 VBAR register */ |
| ldr r0, =_start |
| mcr p15, 0, r0, c12, c0, 0 @Set VBAR |
| #endif |
| |
| /* the mask ROM code should have PLL and others stable */ |
| #ifndef CONFIG_SKIP_LOWLEVEL_INIT |
| bl cpu_init_cp15 |
| #ifndef CONFIG_SKIP_LOWLEVEL_INIT_ONLY |
| bl cpu_init_crit |
| #endif |
| #endif |
| |
| bl _main |
| |
| /*------------------------------------------------------------------------------*/ |
| |
| ENTRY(c_runtime_cpu_setup) |
| /* |
| * If I-cache is enabled invalidate it |
| */ |
| #ifndef CONFIG_SYS_ICACHE_OFF |
| mcr p15, 0, r0, c7, c5, 0 @ invalidate icache |
| mcr p15, 0, r0, c7, c10, 4 @ DSB |
| mcr p15, 0, r0, c7, c5, 4 @ ISB |
| #endif |
| |
| bx lr |
| |
| ENDPROC(c_runtime_cpu_setup) |
| |
| /************************************************************************* |
| * |
| * void save_boot_params(u32 r0, u32 r1, u32 r2, u32 r3) |
| * __attribute__((weak)); |
| * |
| * Stack pointer is not yet initialized at this moment |
| * Don't save anything to stack even if compiled with -O0 |
| * |
| *************************************************************************/ |
| ENTRY(save_boot_params) |
| b save_boot_params_ret @ back to my caller |
| ENDPROC(save_boot_params) |
| .weak save_boot_params |
| |
| #ifdef CONFIG_ARMV7_LPAE |
| ENTRY(switch_to_hypervisor) |
| b switch_to_hypervisor_ret |
| ENDPROC(switch_to_hypervisor) |
| .weak switch_to_hypervisor |
| #endif |
| |
| /************************************************************************* |
| * |
| * cpu_init_cp15 |
| * |
| * Setup CP15 registers (cache, MMU, TLBs). The I-cache is turned on unless |
| * CONFIG_SYS_ICACHE_OFF is defined. |
| * |
| *************************************************************************/ |
| ENTRY(cpu_init_cp15) |
| /* |
| * Invalidate L1 I/D |
| */ |
| mov r0, #0 @ set up for MCR |
| mcr p15, 0, r0, c8, c7, 0 @ invalidate TLBs |
| mcr p15, 0, r0, c7, c5, 0 @ invalidate icache |
| mcr p15, 0, r0, c7, c5, 6 @ invalidate BP array |
| mcr p15, 0, r0, c7, c10, 4 @ DSB |
| mcr p15, 0, r0, c7, c5, 4 @ ISB |
| |
| /* |
| * disable MMU stuff and caches |
| */ |
| mrc p15, 0, r0, c1, c0, 0 |
| bic r0, r0, #0x00002000 @ clear bits 13 (--V-) |
| bic r0, r0, #0x00000007 @ clear bits 2:0 (-CAM) |
| orr r0, r0, #0x00000002 @ set bit 1 (--A-) Align |
| orr r0, r0, #0x00000800 @ set bit 11 (Z---) BTB |
| #ifdef CONFIG_SYS_ICACHE_OFF |
| bic r0, r0, #0x00001000 @ clear bit 12 (I) I-cache |
| #else |
| orr r0, r0, #0x00001000 @ set bit 12 (I) I-cache |
| #endif |
| mcr p15, 0, r0, c1, c0, 0 |
| |
| #ifdef CONFIG_ARM_ERRATA_716044 |
| mrc p15, 0, r0, c1, c0, 0 @ read system control register |
| orr r0, r0, #1 << 11 @ set bit #11 |
| mcr p15, 0, r0, c1, c0, 0 @ write system control register |
| #endif |
| |
| #if (defined(CONFIG_ARM_ERRATA_742230) || defined(CONFIG_ARM_ERRATA_794072)) |
| mrc p15, 0, r0, c15, c0, 1 @ read diagnostic register |
| orr r0, r0, #1 << 4 @ set bit #4 |
| mcr p15, 0, r0, c15, c0, 1 @ write diagnostic register |
| #endif |
| |
| #ifdef CONFIG_ARM_ERRATA_743622 |
| mrc p15, 0, r0, c15, c0, 1 @ read diagnostic register |
| orr r0, r0, #1 << 6 @ set bit #6 |
| mcr p15, 0, r0, c15, c0, 1 @ write diagnostic register |
| #endif |
| |
| #ifdef CONFIG_ARM_ERRATA_751472 |
| mrc p15, 0, r0, c15, c0, 1 @ read diagnostic register |
| orr r0, r0, #1 << 11 @ set bit #11 |
| mcr p15, 0, r0, c15, c0, 1 @ write diagnostic register |
| #endif |
| #ifdef CONFIG_ARM_ERRATA_761320 |
| mrc p15, 0, r0, c15, c0, 1 @ read diagnostic register |
| orr r0, r0, #1 << 21 @ set bit #21 |
| mcr p15, 0, r0, c15, c0, 1 @ write diagnostic register |
| #endif |
| #ifdef CONFIG_ARM_ERRATA_845369 |
| mrc p15, 0, r0, c15, c0, 1 @ read diagnostic register |
| orr r0, r0, #1 << 22 @ set bit #22 |
| mcr p15, 0, r0, c15, c0, 1 @ write diagnostic register |
| #endif |
| |
| mov r5, lr @ Store my Caller |
| mrc p15, 0, r1, c0, c0, 0 @ r1 has Read Main ID Register (MIDR) |
| mov r3, r1, lsr #20 @ get variant field |
| and r3, r3, #0xf @ r3 has CPU variant |
| and r4, r1, #0xf @ r4 has CPU revision |
| mov r2, r3, lsl #4 @ shift variant field for combined value |
| orr r2, r4, r2 @ r2 has combined CPU variant + revision |
| |
| #ifdef CONFIG_ARM_ERRATA_798870 |
| cmp r2, #0x30 @ Applies to lower than R3p0 |
| bge skip_errata_798870 @ skip if not affected rev |
| cmp r2, #0x20 @ Applies to including and above R2p0 |
| blt skip_errata_798870 @ skip if not affected rev |
| |
| mrc p15, 1, r0, c15, c0, 0 @ read l2 aux ctrl reg |
| orr r0, r0, #1 << 7 @ Enable hazard-detect timeout |
| push {r1-r5} @ Save the cpu info registers |
| bl v7_arch_cp15_set_l2aux_ctrl |
| isb @ Recommended ISB after l2actlr update |
| pop {r1-r5} @ Restore the cpu info - fall through |
| skip_errata_798870: |
| #endif |
| |
| #ifdef CONFIG_ARM_ERRATA_801819 |
| cmp r2, #0x24 @ Applies to lt including R2p4 |
| bgt skip_errata_801819 @ skip if not affected rev |
| cmp r2, #0x20 @ Applies to including and above R2p0 |
| blt skip_errata_801819 @ skip if not affected rev |
| mrc p15, 0, r0, c0, c0, 6 @ pick up REVIDR reg |
| and r0, r0, #1 << 3 @ check REVIDR[3] |
| cmp r0, #1 << 3 |
| beq skip_errata_801819 @ skip erratum if REVIDR[3] is set |
| |
| mrc p15, 0, r0, c1, c0, 1 @ read auxilary control register |
| orr r0, r0, #3 << 27 @ Disables streaming. All write-allocate |
| @ lines allocate in the L1 or L2 cache. |
| orr r0, r0, #3 << 25 @ Disables streaming. All write-allocate |
| @ lines allocate in the L1 cache. |
| push {r1-r5} @ Save the cpu info registers |
| bl v7_arch_cp15_set_acr |
| pop {r1-r5} @ Restore the cpu info - fall through |
| skip_errata_801819: |
| #endif |
| |
| #ifdef CONFIG_ARM_ERRATA_454179 |
| cmp r2, #0x21 @ Only on < r2p1 |
| bge skip_errata_454179 |
| |
| mrc p15, 0, r0, c1, c0, 1 @ Read ACR |
| orr r0, r0, #(0x3 << 6) @ Set DBSM(BIT7) and IBE(BIT6) bits |
| push {r1-r5} @ Save the cpu info registers |
| bl v7_arch_cp15_set_acr |
| pop {r1-r5} @ Restore the cpu info - fall through |
| |
| skip_errata_454179: |
| #endif |
| |
| #ifdef CONFIG_ARM_ERRATA_430973 |
| cmp r2, #0x21 @ Only on < r2p1 |
| bge skip_errata_430973 |
| |
| mrc p15, 0, r0, c1, c0, 1 @ Read ACR |
| orr r0, r0, #(0x1 << 6) @ Set IBE bit |
| push {r1-r5} @ Save the cpu info registers |
| bl v7_arch_cp15_set_acr |
| pop {r1-r5} @ Restore the cpu info - fall through |
| |
| skip_errata_430973: |
| #endif |
| |
| #ifdef CONFIG_ARM_ERRATA_621766 |
| cmp r2, #0x21 @ Only on < r2p1 |
| bge skip_errata_621766 |
| |
| mrc p15, 0, r0, c1, c0, 1 @ Read ACR |
| orr r0, r0, #(0x1 << 5) @ Set L1NEON bit |
| push {r1-r5} @ Save the cpu info registers |
| bl v7_arch_cp15_set_acr |
| pop {r1-r5} @ Restore the cpu info - fall through |
| |
| skip_errata_621766: |
| #endif |
| |
| mov pc, r5 @ back to my caller |
| ENDPROC(cpu_init_cp15) |
| |
| #if !defined(CONFIG_SKIP_LOWLEVEL_INIT) && \ |
| !defined(CONFIG_SKIP_LOWLEVEL_INIT_ONLY) |
| /************************************************************************* |
| * |
| * CPU_init_critical registers |
| * |
| * setup important registers |
| * setup memory timing |
| * |
| *************************************************************************/ |
| ENTRY(cpu_init_crit) |
| /* |
| * Jump to board specific initialization... |
| * The Mask ROM will have already initialized |
| * basic memory. Go here to bump up clock rate and handle |
| * wake up conditions. |
| */ |
| b lowlevel_init @ go setup pll,mux,memory |
| ENDPROC(cpu_init_crit) |
| #endif |
