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113 lines
4.6 KiB
113 lines
4.6 KiB
/*
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* Copyright (c) 2006-2021, RT-Thread Development Team
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*
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* SPDX-License-Identifier: Apache-2.0
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*
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* Change Logs:
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* Date Author Notes
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* 2018-10-03 Bernard The first version
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*/
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#ifndef RISCV_PLIC_H__
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#define RISCV_PLIC_H__
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#ifndef PLIC_BASE_ADDR
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#define PLIC_BASE_ADDR 0x0
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#endif
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/* Priority Register - 32 bits per source */
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#define PLIC_PRIORITY_OFFSET (0x00000000UL)
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#define PLIC_PRIORITY_SHIFT_PER_SOURCE 2
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/* Pending Register - 1 bit per soirce */
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#define PLIC_PENDING_OFFSET (0x00001000UL)
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#define PLIC_PENDING_SHIFT_PER_SOURCE 0
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/* Enable Register - 0x80 per target */
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#define PLIC_ENABLE_OFFSET (0x00002000UL)
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#define PLIC_ENABLE_SHIFT_PER_TARGET 7
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/* Priority Threshold Register - 0x1000 per target */
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#define PLIC_THRESHOLD_OFFSET (0x00200000UL)
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#define PLIC_THRESHOLD_SHIFT_PER_TARGET 12
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/* Claim Register - 0x1000 per target */
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#define PLIC_CLAIM_OFFSET (0x00200004UL)
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#define PLIC_CLAIM_SHIFT_PER_TARGET 12
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#if defined(__GNUC__) && !defined(__ASSEMBLER__)
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__attribute__((always_inline)) static inline void __plic_set_feature(unsigned int feature)
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{
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volatile unsigned int *feature_ptr = (volatile unsigned int *)PLIC_BASE_ADDR;
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*feature_ptr = feature;
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}
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__attribute__((always_inline)) static inline void __plic_set_threshold(unsigned int threshold)
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{
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unsigned int hart_id = read_csr(mhartid);
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volatile unsigned int *threshold_ptr = (volatile unsigned int *)(PLIC_BASE_ADDR +
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PLIC_THRESHOLD_OFFSET +
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(hart_id << PLIC_THRESHOLD_SHIFT_PER_TARGET));
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*threshold_ptr = threshold;
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}
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__attribute__((always_inline)) static inline void __plic_set_priority(unsigned int source, unsigned int priority)
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{
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volatile unsigned int *priority_ptr = (volatile unsigned int *)(PLIC_BASE_ADDR +
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PLIC_PRIORITY_OFFSET +
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(source << PLIC_PRIORITY_SHIFT_PER_SOURCE));
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*priority_ptr = priority;
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}
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__attribute__((always_inline)) static inline void __plic_set_pending(unsigned int source)
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{
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volatile unsigned int *current_ptr = (volatile unsigned int *)(PLIC_BASE_ADDR +
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PLIC_PENDING_OFFSET +
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((source >> 5) << 2));
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*current_ptr = (1 << (source & 0x1F));
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}
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__attribute__((always_inline)) static inline void __plic_irq_enable(unsigned int source)
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{
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unsigned int hart_id = read_csr(mhartid);
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volatile unsigned int *current_ptr = (volatile unsigned int *)(PLIC_BASE_ADDR +
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PLIC_ENABLE_OFFSET +
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(hart_id << PLIC_ENABLE_SHIFT_PER_TARGET) +
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((source >> 5) << 2));
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unsigned int current = *current_ptr;
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current = current | (1 << (source & 0x1F));
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*current_ptr = current;
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}
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__attribute__((always_inline)) static inline void __plic_irq_disable(unsigned int source)
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{
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unsigned int hart_id = read_csr(mhartid);
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volatile unsigned int *current_ptr = (volatile unsigned int *)(PLIC_BASE_ADDR +
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PLIC_ENABLE_OFFSET +
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(hart_id << PLIC_ENABLE_SHIFT_PER_TARGET) +
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((source >> 5) << 2));
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unsigned int current = *current_ptr;
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current = current & ~((1 << (source & 0x1F)));
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*current_ptr = current;
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}
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__attribute__((always_inline)) static inline unsigned int __plic_irq_claim(void)
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{
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unsigned int hart_id = read_csr(mhartid);
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volatile unsigned int *claim_addr = (volatile unsigned int *)(PLIC_BASE_ADDR +
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PLIC_CLAIM_OFFSET +
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(hart_id << PLIC_CLAIM_SHIFT_PER_TARGET));
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return *claim_addr;
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}
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__attribute__((always_inline)) static inline void __plic_irq_complete(unsigned int source)
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{
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unsigned int hart_id = read_csr(mhartid);
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volatile unsigned int *claim_addr = (volatile unsigned int *)(PLIC_BASE_ADDR +
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PLIC_CLAIM_OFFSET +
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(hart_id << PLIC_CLAIM_SHIFT_PER_TARGET));
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*claim_addr = source;
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}
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#endif /* end of __GNUC__ */
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#endif
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