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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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/** @addtogroup fhc
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 * @{
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 */
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/**
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 * @file    fhc.c
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 * @brief   FHC bus controller driver.
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 */
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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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#define NAME "fhc"
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#define FHC_UART_INR    0x39    
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#define FHC_UART_IMAP   0x0
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#define FHC_UART_ICLR   0x4
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static void *fhc_uart_phys;
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static volatile uint32_t *fhc_uart_virt;
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static size_t fhc_uart_size;
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/** Handle one connection to fhc.
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 *
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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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 */
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static void fhc_connection(ipc_callid_t iid, ipc_call_t *icall)
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{
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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);
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            switch (inr) {
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            case FHC_UART_INR:
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                fhc_uart_virt[FHC_UART_ICLR] = 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, ENOTSUP);
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                break;
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            }
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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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/** Initialize the FHC driver.
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 *
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 * So far, the driver heavily depends on information provided by the kernel via
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 * sysinfo. In the future, there should be a standalone FHC driver.
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 */
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static bool fhc_init(void)
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{
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    ipcarg_t phonead;
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    fhc_uart_size = sysinfo_value("fhc.uart.size");
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    fhc_uart_phys = (void *) sysinfo_value("fhc.uart.physical");
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    if (!fhc_uart_size) {
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        printf(NAME ": no FHC UART registers found\n");
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        return false;
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    }
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    fhc_uart_virt = as_get_mappable_page(fhc_uart_size);
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    int flags = AS_AREA_READ | AS_AREA_WRITE;
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    int retval = physmem_map(fhc_uart_phys, (void *) fhc_uart_virt,
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        ALIGN_UP(fhc_uart_size, PAGE_SIZE) >> PAGE_WIDTH, flags);
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    if (retval < 0) {
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        printf(NAME ": Error mapping FHC UART registers\n");
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        return false;
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    }
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    printf(NAME ": FHC UART registers at %p, %d bytes\n", fhc_uart_phys,
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        fhc_uart_size);
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    async_set_client_connection(fhc_connection);
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    ipc_connect_to_me(PHONE_NS, SERVICE_FHC, 0, 0, &phonead);
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    return true;
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}
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int main(int argc, char **argv)
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{
3977 jermar 143
    printf(NAME ": HelenOS FHC bus controller driver\n");
3969 jermar 144
 
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    if (!fhc_init())
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        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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 */