// SPDX-License-Identifier: GPL-2.0-or-later
/*
 * read/write operation to the PCI config space of CS5536
 *
 * Copyright (C) 2007 Lemote, Inc.
 * Author : jlliu, liujl@lemote.com
 *
 * Copyright (C) 2009 Lemote, Inc.
 * Author: Wu Zhangjin, wuzhangjin@gmail.com
 *
 *      the Virtual Support Module(VSM) for virtulizing the PCI
 *      configure space are defined in cs5536_modulename.c respectively,
 *
 *      after this virtulizing, user can access the PCI configure space
 *      directly as a normal multi-function PCI device which follows
 *      the PCI-2.2 spec.
 */

#include <linux/types.h>
#include <cs5536/cs5536_pci.h>
#include <cs5536/cs5536_vsm.h>

enum {
        CS5536_FUNC_START = -1,
        CS5536_ISA_FUNC,
        reserved_func,
        CS5536_IDE_FUNC,
        CS5536_ACC_FUNC,
        CS5536_OHCI_FUNC,
        CS5536_EHCI_FUNC,
        CS5536_FUNC_END,
};

static const cs5536_pci_vsm_write vsm_conf_write[] = {
        [CS5536_ISA_FUNC]       = pci_isa_write_reg,
        [reserved_func]         = NULL,
        [CS5536_IDE_FUNC]       = pci_ide_write_reg,
        [CS5536_ACC_FUNC]       = pci_acc_write_reg,
        [CS5536_OHCI_FUNC]      = pci_ohci_write_reg,
        [CS5536_EHCI_FUNC]      = pci_ehci_write_reg,
};

static const cs5536_pci_vsm_read vsm_conf_read[] = {
        [CS5536_ISA_FUNC]       = pci_isa_read_reg,
        [reserved_func]         = NULL,
        [CS5536_IDE_FUNC]       = pci_ide_read_reg,
        [CS5536_ACC_FUNC]       = pci_acc_read_reg,
        [CS5536_OHCI_FUNC]      = pci_ohci_read_reg,
        [CS5536_EHCI_FUNC]      = pci_ehci_read_reg,
};

/*
 * write to PCI config space and transfer it to MSR write.
 */
void cs5536_pci_conf_write4(int function, int reg, u32 value)
{
        if ((function <= CS5536_FUNC_START) || (function >= CS5536_FUNC_END))
                return;
        if ((reg < 0) || (reg > 0x100) || ((reg & 0x03) != 0))
                return;

        if (vsm_conf_write[function] != NULL)
                vsm_conf_write[function](reg, value);
}

/*
 * read PCI config space and transfer it to MSR access.
 */
u32 cs5536_pci_conf_read4(int function, int reg)
{
        u32 data = 0;

        if ((function <= CS5536_FUNC_START) || (function >= CS5536_FUNC_END))
                return 0;
        if ((reg < 0) || ((reg & 0x03) != 0))
                return 0;
        if (reg > 0x100)
                return 0xffffffff;

        if (vsm_conf_read[function] != NULL)
                data = vsm_conf_read[function](reg);

        return data;
}