[df2ee9d] | 1 | /** |
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| 2 | * @file |
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| 3 | * |
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| 4 | * @ingroup raspberrypi |
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| 5 | * |
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| 6 | * @brief Raspberry pi SMP management functions provided to SuperCore |
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| 7 | */ |
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| 8 | |
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| 9 | /* |
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| 10 | * Copyright (c) 2016 Pavel Pisa <pisa@cmp.felk.cvut.cz> |
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| 11 | * |
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| 12 | * Czech Technical University in Prague |
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| 13 | * Zikova 1903/4 |
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| 14 | * 166 36 Praha 6 |
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| 15 | * Czech Republic |
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| 16 | * |
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| 17 | * Reuses some ideas from Rohini Kulkarni <krohini1593@gmail.com> |
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| 18 | * GSoC 2015 project and Altera Cyclone-V SMP code |
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| 19 | * by embedded brains GmbH |
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| 20 | * |
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| 21 | * The license and distribution terms for this file may be |
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| 22 | * found in the file LICENSE in this distribution or at |
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| 23 | * http://www.rtems.org/license/LICENSE. |
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| 24 | */ |
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| 25 | |
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| 26 | #include <rtems/score/smpimpl.h> |
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| 27 | |
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| 28 | #include <bsp/start.h> |
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| 29 | #include <bsp/raspberrypi.h> |
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| 30 | #include <bsp.h> |
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| 31 | #include <bsp/arm-cp15-start.h> |
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| 32 | #include <libcpu/arm-cp15.h> |
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| 33 | #include <rtems.h> |
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| 34 | #include <bsp/irq-generic.h> |
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| 35 | #include <assert.h> |
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| 36 | |
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| 37 | bool _CPU_SMP_Start_processor( uint32_t cpu_index ) |
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| 38 | { |
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| 39 | bool started; |
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| 40 | uint32_t cpu_index_self = _SMP_Get_current_processor(); |
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| 41 | |
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| 42 | if (cpu_index != cpu_index_self) { |
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| 43 | |
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| 44 | BCM2835_REG(BCM2836_MAILBOX_3_WRITE_SET_BASE + 0x10 * cpu_index) = (uint32_t)_start; |
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| 45 | |
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| 46 | /* |
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| 47 | * Wait for secondary processor to complete its basic initialization so |
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| 48 | * that we can enable the unified L2 cache. |
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| 49 | */ |
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| 50 | started = _Per_CPU_State_wait_for_non_initial_state(cpu_index, 0); |
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| 51 | } else { |
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| 52 | started = false; |
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| 53 | } |
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| 54 | |
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| 55 | return started; |
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| 56 | } |
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| 57 | |
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| 58 | uint32_t _CPU_SMP_Initialize(void) |
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| 59 | { |
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| 60 | uint32_t cpu_count = (uint32_t)bsp_processor_count; |
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| 61 | |
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| 62 | if ( cpu_count > 4 ) |
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| 63 | cpu_count = 4; |
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| 64 | |
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| 65 | return cpu_count; |
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| 66 | } |
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| 67 | |
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| 68 | void _CPU_SMP_Finalize_initialization( uint32_t cpu_count ) |
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| 69 | { |
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| 70 | /* Do nothing */ |
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| 71 | } |
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| 72 | |
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| 73 | void _CPU_SMP_Prepare_start_multitasking( void ) |
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| 74 | { |
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| 75 | /* Do nothing */ |
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| 76 | } |
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| 77 | |
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| 78 | void _CPU_SMP_Send_interrupt( uint32_t target_cpu_index ) |
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| 79 | { |
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| 80 | /* Generates IPI */ |
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| 81 | BCM2835_REG(BCM2836_MAILBOX_3_WRITE_SET_BASE + |
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| 82 | 0x10 * target_cpu_index) = 0x1; |
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| 83 | } |
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