source: mainline/uspace/lib/c/include/device/hw_res.h@ eec201d

/*
 * Copyright (c) 2010 Lenka Trochtova
 * 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 libc
 * @{
 */
/** @file
 */

#ifndef LIBC_DEVICE_HW_RES_H_
#define LIBC_DEVICE_HW_RES_H_

#include <ipc/dev_iface.h>
#include <async.h>
#include <stdbool.h>

#define DMA_MODE_ON_DEMAND  0
#define DMA_MODE_WRITE      (1 << 2)
#define DMA_MODE_READ       (1 << 3)
#define DMA_MODE_AUTO       (1 << 4)
#define DMA_MODE_DOWN       (1 << 5)
#define DMA_MODE_SINGLE     (1 << 6)
#define DMA_MODE_BLOCK      (1 << 7)

/** HW resource provider interface */
typedef enum {
        HW_RES_GET_RESOURCE_LIST = 0,
        HW_RES_ENABLE_INTERRUPT,
        HW_RES_DISABLE_INTERRUPT,
        HW_RES_CLEAR_INTERRUPT,
        HW_RES_DMA_CHANNEL_SETUP,
        HW_RES_DMA_CHANNEL_REMAIN,
} hw_res_method_t;

/** HW resource types */
typedef enum {
        INTERRUPT,
        IO_RANGE,
        MEM_RANGE,
        DMA_CHANNEL_8,
        DMA_CHANNEL_16,
} hw_res_type_t;

typedef enum {
        LITTLE_ENDIAN = 0,
        BIG_ENDIAN
} endianness_t;

/** HW resource (e.g. interrupt, memory register, i/o register etc.) */
typedef struct {
        hw_res_type_t type;
        union {
                struct {
                        uint64_t address;
                        size_t size;
                        bool relative;
                        endianness_t endianness;
                } mem_range;

                struct {
                        uint64_t address;
                        size_t size;
                        bool relative;
                        endianness_t endianness;
                } io_range;

                struct {
                        int irq;
                } interrupt;

                union {
                        unsigned int dma8;
                        unsigned int dma16;
                } dma_channel;
        } res;
} hw_resource_t;

typedef struct {
        size_t count;
        hw_resource_t *resources;
} hw_resource_list_t;

static inline void hw_res_clean_resource_list(hw_resource_list_t *hw_res)
{
        if (hw_res->resources != NULL) {
                free(hw_res->resources);
                hw_res->resources = NULL;
        }

        hw_res->count = 0;
}

extern errno_t hw_res_get_resource_list(async_sess_t *, hw_resource_list_t *);
extern errno_t hw_res_enable_interrupt(async_sess_t *, int);
extern errno_t hw_res_disable_interrupt(async_sess_t *, int);
extern errno_t hw_res_clear_interrupt(async_sess_t *, int);

extern errno_t hw_res_dma_channel_setup(async_sess_t *, unsigned int, uint32_t,
    uint32_t, uint8_t);
extern errno_t hw_res_dma_channel_remain(async_sess_t *, unsigned, size_t *);

#endif

/** @}
 */