diff options
Diffstat (limited to 'lib/utils/irqchip/fdt_irqchip_imsic.c')
-rw-r--r-- | lib/utils/irqchip/fdt_irqchip_imsic.c | 106 |
1 files changed, 106 insertions, 0 deletions
diff --git a/lib/utils/irqchip/fdt_irqchip_imsic.c b/lib/utils/irqchip/fdt_irqchip_imsic.c new file mode 100644 index 0000000..b6962be --- /dev/null +++ b/lib/utils/irqchip/fdt_irqchip_imsic.c @@ -0,0 +1,106 @@ +/* + * SPDX-License-Identifier: BSD-2-Clause + * + * Copyright (c) 2021 Western Digital Corporation or its affiliates. + * Copyright (c) 2022 Ventana Micro Systems Inc. + * + * Authors: + * Anup Patel <anup.patel@wdc.com> + */ + +#include <libfdt.h> +#include <sbi/riscv_asm.h> +#include <sbi/sbi_error.h> +#include <sbi/sbi_hartmask.h> +#include <sbi_utils/fdt/fdt_helper.h> +#include <sbi_utils/irqchip/fdt_irqchip.h> +#include <sbi_utils/irqchip/imsic.h> + +#define IMSIC_MAX_NR 16 + +static unsigned long imsic_count = 0; +static struct imsic_data imsic[IMSIC_MAX_NR]; + +static int irqchip_imsic_update_hartid_table(void *fdt, int nodeoff, + struct imsic_data *id) +{ + const fdt32_t *val; + u32 phandle, hwirq, hartid; + int i, err, count, cpu_offset, cpu_intc_offset; + + val = fdt_getprop(fdt, nodeoff, "interrupts-extended", &count); + if (!val || count < sizeof(fdt32_t)) + return SBI_EINVAL; + count = count / sizeof(fdt32_t); + + for (i = 0; i < count; i += 2) { + phandle = fdt32_to_cpu(val[i]); + hwirq = fdt32_to_cpu(val[i + 1]); + + cpu_intc_offset = fdt_node_offset_by_phandle(fdt, phandle); + if (cpu_intc_offset < 0) + continue; + + cpu_offset = fdt_parent_offset(fdt, cpu_intc_offset); + if (cpu_intc_offset < 0) + continue; + + err = fdt_parse_hart_id(fdt, cpu_offset, &hartid); + if (err) + return SBI_EINVAL; + if (SBI_HARTMASK_MAX_BITS <= hartid) + return SBI_EINVAL; + + switch (hwirq) { + case IRQ_M_EXT: + err = imsic_map_hartid_to_data(hartid, id, i / 2); + if (err) + return err; + break; + default: + break; + } + } + + return 0; +} + +static int irqchip_imsic_cold_init(void *fdt, int nodeoff, + const struct fdt_match *match) +{ + int rc; + struct imsic_data *id; + + if (IMSIC_MAX_NR <= imsic_count) + return SBI_ENOSPC; + id = &imsic[imsic_count]; + + rc = fdt_parse_imsic_node(fdt, nodeoff, id); + if (rc) + return rc; + if (!id->targets_mmode) + return 0; + + rc = irqchip_imsic_update_hartid_table(fdt, nodeoff, id); + if (rc) + return rc; + + rc = imsic_cold_irqchip_init(id); + if (rc) + return rc; + + imsic_count++; + + return 0; +} + +static const struct fdt_match irqchip_imsic_match[] = { + { .compatible = "riscv,imsics" }, + { }, +}; + +struct fdt_irqchip fdt_irqchip_imsic = { + .match_table = irqchip_imsic_match, + .cold_init = irqchip_imsic_cold_init, + .warm_init = imsic_warm_irqchip_init, +}; |