cs5536_pci.c

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/*
 * read/write operation to the PCI config space of CS5536
 *
 * Copyright (C) 2007 Lemote, Inc.
 * Author : jlliu, [email protected]
 *
 * Copyright (C) 2009 Lemote, Inc.
 * Author: Wu Zhangjin, [email protected]
 *
 * This program is free software; you can redistribute  it and/or modify it
 * under  the terms of  the GNU General  Public License as published by the
 * Free Software Foundation;  either version 2 of the  License, or (at your
 * option) any later version.
 *
 *  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_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;
}