source: mainline/uspace/lib/c/generic/device/hw_res.c@ cf02eaf

/*
 * 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
 */

#include <device/hw_res.h>
#include <errno.h>
#include <async.h>
#include <malloc.h>

int hw_res_get_resource_list(async_sess_t *sess,
    hw_resource_list_t *hw_resources)
{
        sysarg_t count = 0;
        
        async_exch_t *exch = async_exchange_begin(sess);
        if (exch == NULL)
                return ENOMEM;
        int rc = async_req_1_1(exch, DEV_IFACE_ID(HW_RES_DEV_IFACE),
            HW_RES_GET_RESOURCE_LIST, &count);
        
        if (rc != EOK) {
                async_exchange_end(exch);
                return rc;
        }
        
        size_t size = count * sizeof(hw_resource_t);
        hw_resource_t *resources = (hw_resource_t *) malloc(size);
        if (resources == NULL) {
                // FIXME: This is protocol violation
                async_exchange_end(exch);
                return ENOMEM;
        }
        
        rc = async_data_read_start(exch, resources, size);
        async_exchange_end(exch);
        
        if (rc != EOK) {
                free(resources);
                return rc;
        }
        
        hw_resources->resources = resources;
        hw_resources->count = count;
        
        return EOK;
}

bool hw_res_enable_interrupt(async_sess_t *sess)
{
        async_exch_t *exch = async_exchange_begin(sess);
        if (exch == NULL)
                return false;
        int rc = async_req_1_0(exch, DEV_IFACE_ID(HW_RES_DEV_IFACE),
            HW_RES_ENABLE_INTERRUPT);
        async_exchange_end(exch);
        
        return (rc == EOK);
}

/**
 * Setup DMA channel to specified place and mode.
 * @param channel DMA Channel 1,2,3 for 8 bit transfers, 5,6,7 for 16 bit.
 * @param pa Physical address of the buffer. Must be < 16MB for 16 bit and < 1MB
 *           for 8 bit transfers.
 * @param size DMA buffer size, limited to 64K.
 * @param mode Mode of the DMA channel:
 *              - Read or Write
 *              - Allow automatic reset
 *              - Use address decrement instead of increment
 *              - Use SINGLE/BLOCK/ON DEMAND transfer mode
 * @return Error code.
 */
int hw_res_dma_channel_setup(async_sess_t *sess,
    unsigned channel, uint32_t pa, uint32_t size, uint8_t mode)
{
        async_exch_t *exch = async_exchange_begin(sess);
        if (exch == NULL)
                return ENOMEM;
        const uint32_t packed = (channel & 0xffff) | (mode << 16);
        const int ret = async_req_4_0(exch, DEV_IFACE_ID(HW_RES_DEV_IFACE),
            HW_RES_DMA_CHANNEL_SETUP, packed, pa, size);
        async_exchange_end(exch);

        return ret;
}

/**
 * Query remaining bytes in the buffer.
 * @param channel DMA Channel 1,2,3 for 8 bit transfers, 5,6,7 for 16 bit.
 * @return Number of bytes remaining in the buffer(>=0) or error code(<0).
 */
int hw_res_dma_channel_remain(async_sess_t *sess, unsigned channel)
{
        async_exch_t *exch = async_exchange_begin(sess);
        if (exch == NULL)
                return ENOMEM;
        sysarg_t remain;
        const int ret = async_req_2_1(exch, DEV_IFACE_ID(HW_RES_DEV_IFACE),
            HW_RES_DMA_CHANNEL_REMAIN, channel, &remain);
        async_exchange_end(exch);
        if (ret == EOK)
                return remain;
        return ret;
}

/** @}
 */