obio.c

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/*
 * Copyright (c) 2009 Jakub Jermar
 * 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.
 */

#include <ipc/services.h>
#include <ipc/irc.h>
#include <ipc/ns.h>
#include <sysinfo.h>
#include <as.h>
#include <ddi.h>
#include <align.h>
#include <bool.h>
#include <errno.h>
#include <async.h>
#include <align.h>
#include <async.h>
#include <stdio.h>
#include <ipc/devmap.h>

#define NAME "obio"

#define OBIO_SIZE       0x1898  

#define OBIO_IMR_BASE   0x200
#define OBIO_IMR(ino)   (OBIO_IMR_BASE + ((ino) & INO_MASK))

#define OBIO_CIR_BASE   0x300
#define OBIO_CIR(ino)   (OBIO_CIR_BASE + ((ino) & INO_MASK))

#define INO_MASK        0x1f

static void *base_phys;
static volatile uint64_t *base_virt;

static void obio_connection(ipc_callid_t iid, ipc_call_t *icall)
{
        ipc_callid_t callid;
        ipc_call_t call;

        /*
         * Answer the first IPC_M_CONNECT_ME_TO call.
         */
        async_answer_0(iid, EOK);

        while (1) {
                int inr;
        
                callid = async_get_call(&call);
                switch (IPC_GET_IMETHOD(call)) {
                case IRC_ENABLE_INTERRUPT:
                        /* Noop */
                        async_answer_0(callid, EOK);
                        break;
                case IRC_CLEAR_INTERRUPT:
                        inr = IPC_GET_ARG1(call);
                        base_virt[OBIO_CIR(inr & INO_MASK)] = 0;
                        async_answer_0(callid, EOK);
                        break;
                default:
                        async_answer_0(callid, EINVAL);
                        break;
                }
        }
}

static bool obio_init(void)
{
        sysarg_t paddr;
        
        if (sysinfo_get_value("obio.base.physical", &paddr) != EOK) {
                printf(NAME ": no OBIO registers found\n");
                return false;
        }
        
        base_phys = (void *) paddr;
        base_virt = as_get_mappable_page(OBIO_SIZE);
        
        int flags = AS_AREA_READ | AS_AREA_WRITE;
        int retval = physmem_map(base_phys, (void *) base_virt,
            ALIGN_UP(OBIO_SIZE, PAGE_SIZE) >> PAGE_WIDTH, flags);
        
        if (retval < 0) {
                printf(NAME ": Error mapping OBIO registers\n");
                return false;
        }
        
        printf(NAME ": OBIO registers with base at %p\n", base_phys);
        
        async_set_client_connection(obio_connection);
        service_register(SERVICE_IRC);
        
        return true;
}

int main(int argc, char **argv)
{
        printf(NAME ": HelenOS OBIO driver\n");
        
        if (!obio_init())
                return -1;
        
        printf(NAME ": Accepting connections\n");
        async_manager();

        /* Never reached */
        return 0;
}

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