include/linux/irqchip/riscv-imsic.h

root/include/linux/irqchip/riscv-imsic.h
/* SPDX-License-Identifier: GPL-2.0-only */
/*
 * Copyright (C) 2021 Western Digital Corporation or its affiliates.
 * Copyright (C) 2022 Ventana Micro Systems Inc.
 */
#ifndef __LINUX_IRQCHIP_RISCV_IMSIC_H
#define __LINUX_IRQCHIP_RISCV_IMSIC_H

#include <linux/types.h>
#include <linux/bitops.h>
#include <linux/device.h>
#include <linux/fwnode.h>

#define IMSIC_MMIO_PAGE_SHIFT           12
#define IMSIC_MMIO_PAGE_SZ              BIT(IMSIC_MMIO_PAGE_SHIFT)
#define IMSIC_MMIO_PAGE_LE              0x00
#define IMSIC_MMIO_PAGE_BE              0x04

#define IMSIC_MIN_ID                    63
#define IMSIC_MAX_ID                    2048

#define IMSIC_EIDELIVERY                0x70

#define IMSIC_EITHRESHOLD               0x72

#define IMSIC_EIP0                      0x80
#define IMSIC_EIP63                     0xbf
#define IMSIC_EIPx_BITS                 32

#define IMSIC_EIE0                      0xc0
#define IMSIC_EIE63                     0xff
#define IMSIC_EIEx_BITS                 32

#define IMSIC_FIRST                     IMSIC_EIDELIVERY
#define IMSIC_LAST                      IMSIC_EIE63

#define IMSIC_MMIO_SETIPNUM_LE          0x00
#define IMSIC_MMIO_SETIPNUM_BE          0x04

struct imsic_local_config {
        phys_addr_t                             msi_pa;
        void __iomem                            *msi_va;
};

struct imsic_global_config {
        /*
         * MSI Target Address Scheme
         *
         * XLEN-1                                                12     0
         * |                                                     |     |
         * -------------------------------------------------------------
         * |xxxxxx|Group Index|xxxxxxxxxxx|HART Index|Guest Index|  0  |
         * -------------------------------------------------------------
         */

        /* Bits representing Guest index, HART index, and Group index */
        u32                                     guest_index_bits;
        u32                                     hart_index_bits;
        u32                                     group_index_bits;
        u32                                     group_index_shift;

        /* Global base address matching all target MSI addresses */
        phys_addr_t                             base_addr;

        /* Number of interrupt identities */
        u32                                     nr_ids;

        /* Number of guest interrupt identities */
        u32                                     nr_guest_ids;

        /* Number of guest interrupt files per core */
        u32                                     nr_guest_files;

        /* Per-CPU IMSIC addresses */
        struct imsic_local_config __percpu      *local;
};

#ifdef CONFIG_RISCV_IMSIC

const struct imsic_global_config *imsic_get_global_config(void);

#else

static inline const struct imsic_global_config *imsic_get_global_config(void)
{
        return NULL;
}

#endif

#if IS_ENABLED(CONFIG_ACPI) && IS_ENABLED(CONFIG_RISCV_IMSIC)
int imsic_platform_acpi_probe(struct fwnode_handle *fwnode);
struct fwnode_handle *imsic_acpi_get_fwnode(struct device *dev);
#else
static inline struct fwnode_handle *imsic_acpi_get_fwnode(struct device *dev) { return NULL; }
#endif

#endif
Linux
