source: mainline/uspace/lib/drv/include/pci_dev_iface.h@ 241ab7e

/*
 * Copyright (c) 2011 Jan Vesely
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 *
 * - Redistributions of source code must retain the above copyright
 *   notice, this list of conditions and the following disclaimer.
 * - Redistributions in binary form must reproduce the above copyright
 *   notice, this list of conditions and the following disclaimer in the
 *   documentation and/or other materials provided with the distribution.
 * - The name of the author may not be used to endorse or promote products
 *   derived from this software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */

/** @addtogroup libdrv
 * @addtogroup usb
 * @{
 */
/** @file
 * @brief PCI device interface definition.
 */

#ifndef LIBDRV_PCI_DEV_IFACE_H_
#define LIBDRV_PCI_DEV_IFACE_H_

#include <errno.h>

#include "ddf/driver.h"

#define PCI_VENDOR_ID   0x00
#define PCI_DEVICE_ID   0x02
#define PCI_STATUS      0x06
#define PCI_SUB_CLASS   0x0A
#define PCI_BASE_CLASS  0x0B
#define PCI_BAR0        0x10
#define PCI_CAP_PTR     0x34

#define PCI_BAR_COUNT   6

#define PCI_STATUS_CAP_LIST     (1 << 4)

#define PCI_CAP_ID(c)   ((c) + 0x0)
#define PCI_CAP_NEXT(c) ((c) + 0x1)

#define PCI_CAP_PMID            0x1
#define PCI_CAP_VENDORSPECID    0x9

extern errno_t pci_config_space_read_8(async_sess_t *, uint32_t, uint8_t *);
extern errno_t pci_config_space_read_16(async_sess_t *, uint32_t, uint16_t *);
extern errno_t pci_config_space_read_32(async_sess_t *, uint32_t, uint32_t *);

extern errno_t pci_config_space_write_8(async_sess_t *, uint32_t, uint8_t);
extern errno_t pci_config_space_write_16(async_sess_t *, uint32_t, uint16_t);
extern errno_t pci_config_space_write_32(async_sess_t *, uint32_t, uint32_t);

static inline errno_t
pci_config_space_cap_first(async_sess_t *sess, uint8_t *c, uint8_t *id)
{
        errno_t rc;
        uint16_t status;

        rc = pci_config_space_read_16(sess, PCI_STATUS, &status);
        if (rc != EOK)
                return rc;

        if (!(status & PCI_STATUS_CAP_LIST)) {
                *c = 0;
                return EOK;
        }

        rc = pci_config_space_read_8(sess, PCI_CAP_PTR, c);
        if (rc != EOK)
                return rc;
        if (!c)
                return EOK;
        return pci_config_space_read_8(sess, PCI_CAP_ID(*c), id);
}

static inline errno_t
pci_config_space_cap_next(async_sess_t *sess, uint8_t *c, uint8_t *id)
{
        errno_t rc = pci_config_space_read_8(sess, PCI_CAP_NEXT(*c), c);
        if (rc != EOK)
                return rc;
        if (!c)
                return EOK;
        return pci_config_space_read_8(sess, PCI_CAP_ID(*c), id);
}

/** PCI device communication interface. */
typedef struct {
        errno_t (*config_space_read_8)(ddf_fun_t *, uint32_t address, uint8_t *data);
        errno_t (*config_space_read_16)(ddf_fun_t *, uint32_t address, uint16_t *data);
        errno_t (*config_space_read_32)(ddf_fun_t *, uint32_t address, uint32_t *data);

        errno_t (*config_space_write_8)(ddf_fun_t *, uint32_t address, uint8_t data);
        errno_t (*config_space_write_16)(ddf_fun_t *, uint32_t address, uint16_t data);
        errno_t (*config_space_write_32)(ddf_fun_t *, uint32_t address, uint32_t data);
} pci_dev_iface_t;

#endif
/**
 * @}
 */