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https://github.com/riscv-software-src/opensbi.git
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811da5c541
We add simple FDT irqchip driver for IMSIC so that generic platform (and other FDT based platforms) can utilize common IMIC library. Signed-off-by: Anup Patel <anup.patel@wdc.com> Signed-off-by: Anup Patel <apatel@ventanamicro.com> Reviewed-by: Atish Patra <atishp@rivosinc.com>
107 lines
2.2 KiB
C
107 lines
2.2 KiB
C
/*
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* SPDX-License-Identifier: BSD-2-Clause
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*
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* Copyright (c) 2021 Western Digital Corporation or its affiliates.
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* Copyright (c) 2022 Ventana Micro Systems Inc.
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*
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* Authors:
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* Anup Patel <anup.patel@wdc.com>
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*/
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#include <libfdt.h>
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#include <sbi/riscv_asm.h>
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#include <sbi/sbi_error.h>
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#include <sbi/sbi_hartmask.h>
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#include <sbi_utils/fdt/fdt_helper.h>
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#include <sbi_utils/irqchip/fdt_irqchip.h>
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#include <sbi_utils/irqchip/imsic.h>
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#define IMSIC_MAX_NR 16
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static unsigned long imsic_count = 0;
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static struct imsic_data imsic[IMSIC_MAX_NR];
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static int irqchip_imsic_update_hartid_table(void *fdt, int nodeoff,
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struct imsic_data *id)
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{
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const fdt32_t *val;
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u32 phandle, hwirq, hartid;
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int i, err, count, cpu_offset, cpu_intc_offset;
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val = fdt_getprop(fdt, nodeoff, "interrupts-extended", &count);
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if (!val || count < sizeof(fdt32_t))
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return SBI_EINVAL;
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count = count / sizeof(fdt32_t);
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for (i = 0; i < count; i += 2) {
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phandle = fdt32_to_cpu(val[i]);
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hwirq = fdt32_to_cpu(val[i + 1]);
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cpu_intc_offset = fdt_node_offset_by_phandle(fdt, phandle);
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if (cpu_intc_offset < 0)
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continue;
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cpu_offset = fdt_parent_offset(fdt, cpu_intc_offset);
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if (cpu_intc_offset < 0)
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continue;
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err = fdt_parse_hart_id(fdt, cpu_offset, &hartid);
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if (err)
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return SBI_EINVAL;
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if (SBI_HARTMASK_MAX_BITS <= hartid)
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return SBI_EINVAL;
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switch (hwirq) {
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case IRQ_M_EXT:
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err = imsic_map_hartid_to_data(hartid, id, i / 2);
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if (err)
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return err;
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break;
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default:
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break;
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}
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}
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return 0;
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}
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static int irqchip_imsic_cold_init(void *fdt, int nodeoff,
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const struct fdt_match *match)
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{
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int rc;
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struct imsic_data *id;
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if (IMSIC_MAX_NR <= imsic_count)
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return SBI_ENOSPC;
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id = &imsic[imsic_count];
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rc = fdt_parse_imsic_node(fdt, nodeoff, id);
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if (rc)
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return rc;
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if (!id->targets_mmode)
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return 0;
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rc = irqchip_imsic_update_hartid_table(fdt, nodeoff, id);
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if (rc)
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return rc;
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rc = imsic_cold_irqchip_init(id);
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if (rc)
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return rc;
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imsic_count++;
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return 0;
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}
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static const struct fdt_match irqchip_imsic_match[] = {
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{ .compatible = "riscv,imsics" },
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{ },
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};
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struct fdt_irqchip fdt_irqchip_imsic = {
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.match_table = irqchip_imsic_match,
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.cold_init = irqchip_imsic_cold_init,
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.warm_init = imsic_warm_irqchip_init,
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};
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