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3969 jermar 1 
/*
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 * Copyright (c) 2009 Jakub Jermar
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 * All rights reserved.
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 *
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 * Redistribution and use in source and binary forms, with or without
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 * modification, are permitted provided that the following conditions
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 * are met:
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 *
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 * - Redistributions of source code must retain the above copyright
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 *   notice, this list of conditions and the following disclaimer.
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 * - Redistributions in binary form must reproduce the above copyright
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 *   notice, this list of conditions and the following disclaimer in the
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 *   documentation and/or other materials provided with the distribution.
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 * - The name of the author may not be used to endorse or promote products
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 *   derived from this software without specific prior written permission.
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 *
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 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
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 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
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 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
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 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
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 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
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 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
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 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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 */
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3978 jermar 29 
/** @addtogroup obio
3969 jermar 30 
 * @{
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 */
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/**
3978 jermar 34 
 * @file    obio.c
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 * @brief   OBIO driver.
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 *
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 * OBIO is a short for on-board I/O. On UltraSPARC IIi and systems with U2P,
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 * there is a piece of the root PCI bus controller address space, which
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 * contains interrupt mapping and clear registers for all on-board devices.
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 * Although UltraSPARC IIi and U2P are different in general, these registers can
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 * be found at the same addresses.
3969 jermar 42 
 */
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#include <ipc/ipc.h>
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#include <ipc/services.h>
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#include <ipc/bus.h>
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#include <ipc/ns.h>
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#include <sysinfo.h>
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#include <as.h>
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#include <ddi.h>
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#include <align.h>
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#include <bool.h>
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#include <errno.h>
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#include <async.h>
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#include <align.h>
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#include <async.h>
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#include <stdio.h>
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#include <ipc/devmap.h>
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3978 jermar 60 
#define NAME "obio"
3969 jermar 61 
 
3978 jermar 62 
#define OBIO_SIZE   0x1898 
3969 jermar 63 
 
3978 jermar 64 
#define OBIO_IMR_BASE   0x200
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#define OBIO_IMR(ino)   (OBIO_IMR_BASE + ((ino) & INO_MASK))
3969 jermar 66 
 
3978 jermar 67 
#define OBIO_CIR_BASE   0x300
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#define OBIO_CIR(ino)   (OBIO_CIR_BASE + ((ino) & INO_MASK))
3969 jermar 69 
 
3978 jermar 70 
#define INO_MASK    0x1f
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static void *base_phys;
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static volatile uint64_t *base_virt;
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/** Handle one connection to obio.
3969 jermar 76 
 *
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 * @param iid       Hash of the request that opened the connection.
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 * @param icall     Call data of the request that opened the connection.
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 */
3978 jermar 80 
static void obio_connection(ipc_callid_t iid, ipc_call_t *icall)
3969 jermar 81 
{
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    ipc_callid_t callid;
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    ipc_call_t call;
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    /*
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     * Answer the first IPC_M_CONNECT_ME_TO call.
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     */
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    ipc_answer_0(iid, EOK);
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    while (1) {
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        int inr;
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        callid = async_get_call(&call);
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        switch (IPC_GET_METHOD(call)) {
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        case BUS_CLEAR_INTERRUPT:
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            inr = IPC_GET_ARG1(call);
4139 jermar 97 
            base_virt[OBIO_CIR(inr & INO_MASK)] = 0;
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            ipc_answer_0(callid, EOK);
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            break;
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        default:
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            ipc_answer_0(callid, EINVAL);
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            break;
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        }
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    }
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}
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3978 jermar 107 
/** Initialize the OBIO driver.
3969 jermar 108 
 *
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 * So far, the driver heavily depends on information provided by the kernel via
3978 jermar 110 
 * sysinfo. In the future, there should be a standalone OBIO driver.
3969 jermar 111 
 */
3978 jermar 112 
static bool obio_init(void)
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{
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    ipcarg_t phonead;
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3978 jermar 116 
    base_phys = (void *) sysinfo_value("obio.base.physical");
3969 jermar 117 
 
3978 jermar 118 
    if (!base_phys) {
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        printf(NAME ": no OBIO registers found\n");
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        return false;
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    }
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3978 jermar 123 
    base_virt = as_get_mappable_page(OBIO_SIZE);
3969 jermar 124 
 
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    int flags = AS_AREA_READ | AS_AREA_WRITE;
3978 jermar 126 
    int retval = physmem_map(base_phys, (void *) base_virt,
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        ALIGN_UP(OBIO_SIZE, PAGE_SIZE) >> PAGE_WIDTH, flags);
3969 jermar 128 
 
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    if (retval < 0) {
3978 jermar 130 
        printf(NAME ": Error mapping OBIO registers\n");
3969 jermar 131 
        return false;
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    }
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3978 jermar 134 
    printf(NAME ": OBIO registers with base at %p\n", base_phys);
3969 jermar 135 
 
3978 jermar 136 
    async_set_client_connection(obio_connection);
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    ipc_connect_to_me(PHONE_NS, SERVICE_OBIO, 0, 0, &phonead);
3969 jermar 138 
 
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    return true;
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}
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int main(int argc, char **argv)
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{
3978 jermar 144 
    printf(NAME ": HelenOS OBIO driver\n");
3969 jermar 145 
 
3978 jermar 146 
    if (!obio_init())
3969 jermar 147 
        return -1;
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    printf(NAME ": Accepting connections\n");
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    async_manager();
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    /* Never reached */
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    return 0;
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}
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/**
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 * @}
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 */