diff options
Diffstat (limited to 'plat/nvidia/tegra/common/aarch64/tegra_helpers.S')
| -rw-r--r-- | plat/nvidia/tegra/common/aarch64/tegra_helpers.S | 344 |
1 files changed, 344 insertions, 0 deletions
diff --git a/plat/nvidia/tegra/common/aarch64/tegra_helpers.S b/plat/nvidia/tegra/common/aarch64/tegra_helpers.S new file mode 100644 index 0000000..264749b --- /dev/null +++ b/plat/nvidia/tegra/common/aarch64/tegra_helpers.S @@ -0,0 +1,344 @@ +/* + * Copyright (c) 2015, ARM Limited and Contributors. All rights reserved. + * + * Redistribution and use in source and binary forms, with or without + * modification, are permitted provided that the following conditions are met: + * + * Redistributions of source code must retain the above copyright notice, this + * list of conditions and the following disclaimer. + * + * Redistributions in binary form must reproduce the above copyright notice, + * this list of conditions and the following disclaimer in the documentation + * and/or other materials provided with the distribution. + * + * Neither the name of ARM nor the names of its contributors may be used + * to endorse or promote products derived from this software without specific + * prior written permission. + * + * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" + * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE + * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE + * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE + * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR + * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF + * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS + * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN + * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) + * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE + * POSSIBILITY OF SUCH DAMAGE. + */ +#include <arch.h> +#include <asm_macros.S> +#include <assert_macros.S> +#include <cpu_macros.S> +#include <cortex_a57.h> +#include <cortex_a53.h> +#include <tegra_def.h> + + /* Global functions */ + .globl platform_is_primary_cpu + .globl platform_get_core_pos + .globl platform_get_entrypoint + .globl plat_secondary_cold_boot_setup + .globl platform_mem_init + .globl plat_crash_console_init + .globl plat_crash_console_putc + .globl tegra_secure_entrypoint + .globl plat_reset_handler + + /* Global variables */ + .globl sec_entry_point + .globl ns_image_entrypoint + .globl tegra_bl31_phys_base + + /* --------------------- + * Common CPU init code + * --------------------- + */ +.macro cpu_init_common + + /* ------------------------------------------------------- + * Enable L2 and CPU ECTLR RW access from non-secure world + * ------------------------------------------------------- + */ + mov x0, #ACTLR_EL3_ENABLE_ALL_ACCESS + msr actlr_el3, x0 + msr actlr_el2, x0 + isb + + /* -------------------------------- + * Enable the cycle count register + * -------------------------------- + */ + mrs x0, pmcr_el0 + ubfx x0, x0, #11, #5 // read PMCR.N field + mov x1, #1 + lsl x0, x1, x0 + sub x0, x0, #1 // mask of event counters + orr x0, x0, #0x80000000 // disable overflow intrs + msr pmintenclr_el1, x0 + msr pmuserenr_el0, x1 // enable user mode access + + /* ---------------------------------------------------------------- + * Allow non-privileged access to CNTVCT: Set CNTKCTL (Kernel Count + * register), bit 1 (EL0VCTEN) to enable access to CNTVCT/CNTFRQ + * registers from EL0. + * ---------------------------------------------------------------- + */ + mrs x0, cntkctl_el1 + orr x0, x0, #EL0VCTEN_BIT + msr cntkctl_el1, x0 +.endm + + /* ----------------------------------------------------- + * int platform_is_primary_cpu(int mpidr); + * + * This function checks if this is the Primary CPU + * ----------------------------------------------------- + */ +func platform_is_primary_cpu + and x0, x0, #(MPIDR_CLUSTER_MASK | MPIDR_CPU_MASK) + cmp x0, #TEGRA_PRIMARY_CPU + cset x0, eq + ret +endfunc platform_is_primary_cpu + + /* ----------------------------------------------------- + * int platform_get_core_pos(int mpidr); + * + * With this function: CorePos = CoreId + * ----------------------------------------------------- + */ +func platform_get_core_pos + and x0, x0, #MPIDR_CPU_MASK + ret +endfunc platform_get_core_pos + + /* ----------------------------------------------------- + * void plat_secondary_cold_boot_setup (void); + * + * This function performs any platform specific actions + * needed for a secondary cpu after a cold reset. Right + * now this is a stub function. + * ----------------------------------------------------- + */ +func plat_secondary_cold_boot_setup + mov x0, #0 + ret +endfunc plat_secondary_cold_boot_setup + + /* ----------------------------------------------------- + * void platform_get_entrypoint (unsigned int mpidr); + * + * Main job of this routine is to distinguish between + * a cold and warm boot. If the sec_entry_point for + * this CPU is present, then it's a warm boot. + * + * ----------------------------------------------------- + */ +func platform_get_entrypoint + and x0, x0, #MPIDR_CPU_MASK + adr x1, sec_entry_point + ldr x0, [x1, x0, lsl #3] + ret +endfunc platform_get_entrypoint + + /* -------------------------------------------------------- + * void platform_mem_init (void); + * + * Any memory init, relocation to be done before the + * platform boots. Called very early in the boot process. + * -------------------------------------------------------- + */ +func platform_mem_init + mov x0, #0 + ret +endfunc platform_mem_init + + /* --------------------------------------------- + * int plat_crash_console_init(void) + * Function to initialize the crash console + * without a C Runtime to print crash report. + * Clobber list : x0, x1, x2 + * --------------------------------------------- + */ +func plat_crash_console_init + mov_imm x0, TEGRA_BOOT_UART_BASE + mov_imm x1, TEGRA_BOOT_UART_CLK_IN_HZ + mov_imm x2, TEGRA_CONSOLE_BAUDRATE + b console_core_init +endfunc plat_crash_console_init + + /* --------------------------------------------- + * int plat_crash_console_putc(void) + * Function to print a character on the crash + * console without a C Runtime. + * Clobber list : x1, x2 + * --------------------------------------------- + */ +func plat_crash_console_putc + mov_imm x1, TEGRA_BOOT_UART_BASE + b console_core_putc +endfunc plat_crash_console_putc + + /* --------------------------------------------------- + * Function to handle a platform reset and store + * input parameters passed by BL2. + * --------------------------------------------------- + */ +func plat_reset_handler + + /* ----------------------------------- + * derive and save the phys_base addr + * ----------------------------------- + */ + adr x17, tegra_bl31_phys_base + ldr x18, [x17] + cbnz x18, 1f + adr x18, bl31_entrypoint + str x18, [x17] + +1: cpu_init_common + + ret +endfunc plat_reset_handler + + /* ---------------------------------------- + * Secure entrypoint function for CPU boot + * ---------------------------------------- + */ + .align 6 +func tegra_secure_entrypoint + +#if ERRATA_TEGRA_INVALIDATE_BTB_AT_BOOT + + /* ------------------------------------------------------- + * Invalidate BTB along with I$ to remove any stale + * entries from the branch predictor array. + * ------------------------------------------------------- + */ + mrs x0, CPUACTLR_EL1 + orr x0, x0, #1 + msr CPUACTLR_EL1, x0 /* invalidate BTB and I$ together */ + dsb sy + isb + ic iallu /* actual invalidate */ + dsb sy + isb + + mrs x0, CPUACTLR_EL1 + bic x0, x0, #1 + msr CPUACTLR_EL1, X0 /* restore original CPUACTLR_EL1 */ + dsb sy + isb + + .rept 7 + nop /* wait */ + .endr + + /* ----------------------------------------------- + * Extract OSLK bit and check if it is '1'. This + * bit remains '0' for A53 on warm-resets. If '1', + * turn off regional clock gating and request warm + * reset. + * ----------------------------------------------- + */ + mrs x0, oslsr_el1 + and x0, x0, #2 + mrs x1, mpidr_el1 + bics xzr, x0, x1, lsr #7 /* 0 = slow cluster or warm reset */ + b.eq restore_oslock + mov x0, xzr + msr oslar_el1, x0 /* os lock stays 0 across warm reset */ + mov x3, #3 + movz x4, #0x8000, lsl #48 + msr CPUACTLR_EL1, x4 /* turn off RCG */ + isb + msr rmr_el3, x3 /* request warm reset */ + isb + dsb sy +1: wfi + b 1b + + /* -------------------------------------------------- + * These nops are here so that speculative execution + * won't harm us before we are done with warm reset. + * -------------------------------------------------- + */ + .rept 65 + nop + .endr + + /* -------------------------------------------------- + * Do not insert instructions here + * -------------------------------------------------- + */ +#endif + + /* -------------------------------------------------- + * Restore OS Lock bit + * -------------------------------------------------- + */ +restore_oslock: + mov x0, #1 + msr oslar_el1, x0 + + cpu_init_common + + /* --------------------------------------------------------------------- + * The initial state of the Architectural feature trap register + * (CPTR_EL3) is unknown and it must be set to a known state. All + * feature traps are disabled. Some bits in this register are marked as + * Reserved and should not be modified. + * + * CPTR_EL3.TCPAC: This causes a direct access to the CPACR_EL1 from EL1 + * or the CPTR_EL2 from EL2 to trap to EL3 unless it is trapped at EL2. + * CPTR_EL3.TTA: This causes access to the Trace functionality to trap + * to EL3 when executed from EL0, EL1, EL2, or EL3. If system register + * access to trace functionality is not supported, this bit is RES0. + * CPTR_EL3.TFP: This causes instructions that access the registers + * associated with Floating Point and Advanced SIMD execution to trap + * to EL3 when executed from any exception level, unless trapped to EL1 + * or EL2. + * --------------------------------------------------------------------- + */ + mrs x1, cptr_el3 + bic w1, w1, #TCPAC_BIT + bic w1, w1, #TTA_BIT + bic w1, w1, #TFP_BIT + msr cptr_el3, x1 + + /* -------------------------------------------------- + * Get secure world's entry point and jump to it + * -------------------------------------------------- + */ + mrs x0, mpidr_el1 + bl platform_get_entrypoint + br x0 +endfunc tegra_secure_entrypoint + + .data + .align 3 + + /* -------------------------------------------------- + * Per-CPU Secure entry point - resume from suspend + * -------------------------------------------------- + */ +sec_entry_point: + .rept PLATFORM_CORE_COUNT + .quad 0 + .endr + + /* -------------------------------------------------- + * NS world's cold boot entry point + * -------------------------------------------------- + */ +ns_image_entrypoint: + .quad 0 + + /* -------------------------------------------------- + * BL31's physical base address + * -------------------------------------------------- + */ +tegra_bl31_phys_base: + .quad 0 |