93f81bd490
repo: https://github.com/T-head-Semi/opensbi commit: 89182b257c8798e15e4c685c1af0c2862d528d2a Change-Id: I7b39d66729e0108661a6f4c9e28acbdb303684ea
108 lines
2.4 KiB
C
108 lines
2.4 KiB
C
/*
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* SPDX-License-Identifier: BSD-2-Clause
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*
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* Copyright (c) 2019 Andes Technology Corporation
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*
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* Authors:
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* Zong Li <zong@andestech.com>
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* Nylon Chen <nylon7@andestech.com>
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*/
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#include <sbi/riscv_asm.h>
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#include <sbi/riscv_io.h>
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#include <sbi/sbi_timer.h>
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static u32 plmt_time_hart_count;
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static volatile void *plmt_time_base;
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static volatile u64 *plmt_time_val;
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static volatile u64 *plmt_time_cmp;
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static u64 plmt_timer_value(void)
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{
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#if __riscv_xlen == 64
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return readq_relaxed(plmt_time_val);
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#else
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u32 lo, hi;
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do {
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hi = readl_relaxed((void *)plmt_time_val + 0x04);
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lo = readl_relaxed(plmt_time_val);
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} while (hi != readl_relaxed((void *)plmt_time_val + 0x04));
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return ((u64)hi << 32) | (u64)lo;
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#endif
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}
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static void plmt_timer_event_stop(void)
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{
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u32 target_hart = current_hartid();
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if (plmt_time_hart_count <= target_hart)
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return;
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/* Clear PLMT Time Compare */
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#if __riscv_xlen == 64
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writeq_relaxed(-1ULL, &plmt_time_cmp[target_hart]);
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#else
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writel_relaxed(-1UL, &plmt_time_cmp[target_hart]);
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writel_relaxed(-1UL, (void *)(&plmt_time_cmp[target_hart]) + 0x04);
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#endif
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}
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static void plmt_timer_event_start(u64 next_event)
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{
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u32 target_hart = current_hartid();
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if (plmt_time_hart_count <= target_hart)
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return;
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/* Program PLMT Time Compare */
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#if __riscv_xlen == 64
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writeq_relaxed(next_event, &plmt_time_cmp[target_hart]);
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#else
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u32 mask = -1UL;
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writel_relaxed(next_event & mask, &plmt_time_cmp[target_hart]);
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writel_relaxed(next_event >> 32,
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(void *)(&plmt_time_cmp[target_hart]) + 0x04);
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#endif
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}
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static struct sbi_timer_device plmt_timer = {
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.name = "ae350_plmt",
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.timer_value = plmt_timer_value,
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.timer_event_start = plmt_timer_event_start,
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.timer_event_stop = plmt_timer_event_stop
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};
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int plmt_warm_timer_init(void)
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{
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u32 target_hart = current_hartid();
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if (plmt_time_hart_count <= target_hart || !plmt_time_base)
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return -1;
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/* Clear PLMT Time Compare */
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#if __riscv_xlen == 64
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writeq_relaxed(-1ULL, &plmt_time_cmp[target_hart]);
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#else
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writel_relaxed(-1UL, &plmt_time_cmp[target_hart]);
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writel_relaxed(-1UL, (void *)(&plmt_time_cmp[target_hart]) + 0x04);
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#endif
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return 0;
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}
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int plmt_cold_timer_init(unsigned long base, u32 hart_count)
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{
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plmt_time_hart_count = hart_count;
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plmt_time_base = (void *)base;
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plmt_time_val = (u64 *)(plmt_time_base);
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plmt_time_cmp = (u64 *)(plmt_time_base + 0x8);
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sbi_timer_set_device(&plmt_timer);
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return 0;
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}
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