diff options
Diffstat (limited to 'plat/arm/board/juno/aarch32')
| -rw-r--r-- | plat/arm/board/juno/aarch32/juno_helpers.S | 176 |
1 files changed, 176 insertions, 0 deletions
diff --git a/plat/arm/board/juno/aarch32/juno_helpers.S b/plat/arm/board/juno/aarch32/juno_helpers.S new file mode 100644 index 0000000..8f9561c --- /dev/null +++ b/plat/arm/board/juno/aarch32/juno_helpers.S @@ -0,0 +1,176 @@ +/* + * Copyright (c) 2016, ARM Limited and Contributors. All rights reserved. + * + * SPDX-License-Identifier: BSD-3-Clause + */ + +#include <arch.h> +#include <asm_macros.S> +#include <common/bl_common.h> +#include <cortex_a53.h> +#include <cortex_a57.h> +#include <cortex_a72.h> +#include <cpu_macros.S> +#include <platform_def.h> + + .globl plat_reset_handler + .globl plat_arm_calc_core_pos + +#define JUNO_REVISION(rev) REV_JUNO_R##rev +#define JUNO_HANDLER(rev) plat_reset_handler_juno_r##rev +#define JUMP_TO_HANDLER_IF_JUNO_R(revision) \ + jump_to_handler JUNO_REVISION(revision), JUNO_HANDLER(revision) + + /* -------------------------------------------------------------------- + * Helper macro to jump to the given handler if the board revision + * matches. + * Expects the Juno board revision in x0. + * -------------------------------------------------------------------- + */ + .macro jump_to_handler _revision, _handler + cmp r0, #\_revision + beq \_handler + .endm + + /* -------------------------------------------------------------------- + * Platform reset handler for Juno R0. + * + * Juno R0 has the following topology: + * - Quad core Cortex-A53 processor cluster; + * - Dual core Cortex-A57 processor cluster. + * + * This handler does the following: + * - Implement workaround for defect id 831273 by enabling an event + * stream every 65536 cycles. + * - Set the L2 Data RAM latency to 2 (i.e. 3 cycles) for Cortex-A57 + * - Set the L2 Tag RAM latency to 2 (i.e. 3 cycles) for Cortex-A57 + * -------------------------------------------------------------------- + */ +func JUNO_HANDLER(0) + /* -------------------------------------------------------------------- + * Enable the event stream every 65536 cycles + * -------------------------------------------------------------------- + */ + mov r0, #(0xf << EVNTI_SHIFT) + orr r0, r0, #EVNTEN_BIT + stcopr r0, CNTKCTL + + /* -------------------------------------------------------------------- + * Nothing else to do on Cortex-A53. + * -------------------------------------------------------------------- + */ + jump_if_cpu_midr CORTEX_A53_MIDR, 1f + + /* -------------------------------------------------------------------- + * Cortex-A57 specific settings + * -------------------------------------------------------------------- + */ + mov r0, #((CORTEX_A57_L2_DATA_RAM_LATENCY_3_CYCLES << CORTEX_A57_L2CTLR_DATA_RAM_LATENCY_SHIFT) | \ + (CORTEX_A57_L2_TAG_RAM_LATENCY_3_CYCLES << CORTEX_A57_L2CTLR_TAG_RAM_LATENCY_SHIFT)) + stcopr r0, CORTEX_A57_L2CTLR +1: + isb + bx lr +endfunc JUNO_HANDLER(0) + + /* -------------------------------------------------------------------- + * Platform reset handler for Juno R1. + * + * Juno R1 has the following topology: + * - Quad core Cortex-A53 processor cluster; + * - Dual core Cortex-A57 processor cluster. + * + * This handler does the following: + * - Set the L2 Data RAM latency to 2 (i.e. 3 cycles) for Cortex-A57 + * + * Note that: + * - The default value for the L2 Tag RAM latency for Cortex-A57 is + * suitable. + * - Defect #831273 doesn't affect Juno R1. + * -------------------------------------------------------------------- + */ +func JUNO_HANDLER(1) + /* -------------------------------------------------------------------- + * Nothing to do on Cortex-A53. + * -------------------------------------------------------------------- + */ + jump_if_cpu_midr CORTEX_A57_MIDR, A57 + bx lr + +A57: + /* -------------------------------------------------------------------- + * Cortex-A57 specific settings + * -------------------------------------------------------------------- + */ + mov r0, #(CORTEX_A57_L2_DATA_RAM_LATENCY_3_CYCLES << CORTEX_A57_L2CTLR_DATA_RAM_LATENCY_SHIFT) + stcopr r0, CORTEX_A57_L2CTLR + isb + bx lr +endfunc JUNO_HANDLER(1) + + /* -------------------------------------------------------------------- + * Platform reset handler for Juno R2. + * + * Juno R2 has the following topology: + * - Quad core Cortex-A53 processor cluster; + * - Dual core Cortex-A72 processor cluster. + * + * This handler does the following: + * - Set the L2 Data RAM latency to 2 (i.e. 3 cycles) for Cortex-A72 + * - Set the L2 Tag RAM latency to 1 (i.e. 2 cycles) for Cortex-A72 + * + * Note that: + * - Defect #831273 doesn't affect Juno R2. + * -------------------------------------------------------------------- + */ +func JUNO_HANDLER(2) + /* -------------------------------------------------------------------- + * Nothing to do on Cortex-A53. + * -------------------------------------------------------------------- + */ + jump_if_cpu_midr CORTEX_A72_MIDR, A72 + bx lr + +A72: + /* -------------------------------------------------------------------- + * Cortex-A72 specific settings + * -------------------------------------------------------------------- + */ + mov r0, #((CORTEX_A72_L2_DATA_RAM_LATENCY_3_CYCLES << CORTEX_A72_L2CTLR_DATA_RAM_LATENCY_SHIFT) | \ + (CORTEX_A72_L2_TAG_RAM_LATENCY_2_CYCLES << CORTEX_A72_L2CTLR_TAG_RAM_LATENCY_SHIFT)) + stcopr r0, CORTEX_A72_L2CTLR + isb + bx lr +endfunc JUNO_HANDLER(2) + + /* -------------------------------------------------------------------- + * void plat_reset_handler(void); + * + * Determine the Juno board revision and call the appropriate reset + * handler. + * -------------------------------------------------------------------- + */ +func plat_reset_handler + /* Read the V2M SYS_ID register */ + ldr r0, =(V2M_SYSREGS_BASE + V2M_SYS_ID) + ldr r1, [r0] + /* Extract board revision from the SYS_ID */ + ubfx r0, r1, #V2M_SYS_ID_REV_SHIFT, #4 + + JUMP_TO_HANDLER_IF_JUNO_R(0) + JUMP_TO_HANDLER_IF_JUNO_R(1) + JUMP_TO_HANDLER_IF_JUNO_R(2) + + /* Board revision is not supported */ + no_ret plat_panic_handler + +endfunc plat_reset_handler + + /* ----------------------------------------------------- + * unsigned int plat_arm_calc_core_pos(u_register_t mpidr) + * Helper function to calculate the core position. + * ----------------------------------------------------- + */ +func plat_arm_calc_core_pos + b css_calc_core_pos_swap_cluster +endfunc plat_arm_calc_core_pos |