source: mainline/uspace/srv/bd/gxe_bd/gxe_bd.c@ 8559fa0

/*
 * Copyright (c) 2009 Jiri Svoboda
 * 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 bd
 * @{
 */

/**
 * @file
 * @brief GXemul disk driver
 */

#include <stdio.h>
#include <libarch/ddi.h>
#include <ddi.h>
#include <async.h>
#include <as.h>
#include <bd_srv.h>
#include <fibril_synch.h>
#include <loc.h>
#include <sys/types.h>
#include <errno.h>
#include <macros.h>
#include <task.h>

#define NAME       "gxe_bd"
#define NAMESPACE  "bd"

enum {
        CTL_READ_START  = 0,
        CTL_WRITE_START = 1,
};

enum {
        STATUS_FAILURE  = 0
};

enum {
        MAX_DISKS       = 2
};

/** GXE disk hardware registers */
typedef struct {
        uint32_t offset_lo;
        uint32_t pad0;
        uint32_t offset_hi;
        uint32_t pad1;

        uint32_t disk_id;
        uint32_t pad2[3];

        uint32_t control;
        uint32_t pad3[3];

        uint32_t status;

        uint32_t pad4[3];
        uint8_t pad5[0x3fc0];

        uint8_t buffer[512];
} gxe_bd_hw_t;

/** GXE block device soft state */
typedef struct {
        /** Block device service structure */
        bd_srvs_t bds;
        int disk_id;
} gxe_bd_t;

static const size_t block_size = 512;

static uintptr_t dev_physical = 0x13000000;
static gxe_bd_hw_t *dev;

static service_id_t service_id[MAX_DISKS];

static fibril_mutex_t dev_lock[MAX_DISKS];

static gxe_bd_t gxe_bd[MAX_DISKS];

static int gxe_bd_init(void);
static void gxe_bd_connection(ipc_callid_t iid, ipc_call_t *icall, void *);
static int gxe_bd_read_block(int disk_id, uint64_t ba, void *buf);
static int gxe_bd_write_block(int disk_id, uint64_t ba, const void *buf);

static int gxe_bd_open(bd_srvs_t *, bd_srv_t *);
static int gxe_bd_close(bd_srv_t *);
static int gxe_bd_read_blocks(bd_srv_t *, aoff64_t, size_t, void *, size_t);
static int gxe_bd_write_blocks(bd_srv_t *, aoff64_t, size_t, const void *, size_t);
static int gxe_bd_get_block_size(bd_srv_t *, size_t *);
static int gxe_bd_get_num_blocks(bd_srv_t *, aoff64_t *);

static bd_ops_t gxe_bd_ops = {
        .open = gxe_bd_open,
        .close = gxe_bd_close,
        .read_blocks = gxe_bd_read_blocks,
        .write_blocks = gxe_bd_write_blocks,
        .get_block_size = gxe_bd_get_block_size,
        .get_num_blocks = gxe_bd_get_num_blocks
};

static gxe_bd_t *bd_srv_gxe(bd_srv_t *bd)
{
        return (gxe_bd_t *) bd->srvs->sarg;
}

int main(int argc, char **argv)
{
        printf(NAME ": GXemul disk driver\n");

        if (gxe_bd_init() != EOK)
                return -1;

        printf(NAME ": Accepting connections\n");
        task_retval(0);
        async_manager();

        /* Not reached */
        return 0;
}

static int gxe_bd_init(void)
{
        async_set_client_connection(gxe_bd_connection);
        int rc = loc_server_register(NAME);
        if (rc != EOK) {
                printf("%s: Unable to register driver.\n", NAME);
                return rc;
        }
        
        void *vaddr;
        rc = pio_enable((void *) dev_physical, sizeof(gxe_bd_hw_t), &vaddr);
        if (rc != EOK) {
                printf("%s: Could not initialize device I/O space.\n", NAME);
                return rc;
        }
        
        dev = vaddr;
        
        for (unsigned int i = 0; i < MAX_DISKS; i++) {
                char name[16];
                
                bd_srvs_init(&gxe_bd[i].bds);
                gxe_bd[i].bds.ops = &gxe_bd_ops;
                gxe_bd[i].bds.sarg = (void *)&gxe_bd[i];
                
                snprintf(name, 16, "%s/disk%u", NAMESPACE, i);
                rc = loc_service_register(name, &service_id[i]);
                if (rc != EOK) {
                        printf("%s: Unable to register device %s.\n", NAME,
                            name);
                        return rc;
                }
                
                fibril_mutex_initialize(&dev_lock[i]);
        }
        
        return EOK;
}

static void gxe_bd_connection(ipc_callid_t iid, ipc_call_t *icall, void *arg)
{
        service_id_t dsid;
        int disk_id, i;

        /* Get the device handle. */
        dsid = IPC_GET_ARG1(*icall);

        /* Determine which disk device is the client connecting to. */
        disk_id = -1;
        for (i = 0; i < MAX_DISKS; i++)
                if (service_id[i] == dsid)
                        disk_id = i;

        if (disk_id < 0) {
                async_answer_0(iid, EINVAL);
                return;
        }

        bd_conn(iid, icall, &gxe_bd[disk_id].bds);
}

/** Open device. */
static int gxe_bd_open(bd_srvs_t *bds, bd_srv_t *bd)
{
        return EOK;
}

/** Close device. */
static int gxe_bd_close(bd_srv_t *bd)
{
        return EOK;
}

/** Read multiple blocks from the device. */
static int gxe_bd_read_blocks(bd_srv_t *bd, aoff64_t ba, size_t cnt,
    void *buf, size_t size)
{
        int disk_id = bd_srv_gxe(bd)->disk_id;
        int rc;

        if (size < cnt * block_size)
                return EINVAL;

        while (cnt > 0) {
                rc = gxe_bd_read_block(disk_id, ba, buf);
                if (rc != EOK)
                        return rc;

                ++ba;
                --cnt;
                buf += block_size;
        }

        return EOK;
}

/** Write multiple blocks to the device. */
static int gxe_bd_write_blocks(bd_srv_t *bd, aoff64_t ba, size_t cnt,
    const void *buf, size_t size)
{
        int disk_id = bd_srv_gxe(bd)->disk_id;
        int rc;

        if (size < cnt * block_size)
                return EINVAL;

        while (cnt > 0) {
                rc = gxe_bd_write_block(disk_id, ba, buf);
                if (rc != EOK)
                        return rc;

                ++ba;
                --cnt;
                buf += block_size;
        }

        return EOK;
}

/** Get device block size. */
static int gxe_bd_get_block_size(bd_srv_t *bd, size_t *rsize)
{
        *rsize = block_size;
        return EOK;
}

/** Get number of blocks on device. */
static int gxe_bd_get_num_blocks(bd_srv_t *bd, aoff64_t *rnb)
{
        return ENOTSUP;
}

/** Read a block from the device. */
static int gxe_bd_read_block(int disk_id, uint64_t ba, void *buf)
{
        uint32_t status;
        uint64_t byte_addr;
        size_t i;
        uint32_t w;

        byte_addr = ba * block_size;

        fibril_mutex_lock(&dev_lock[disk_id]);
        pio_write_32(&dev->offset_lo, (uint32_t) byte_addr);
        pio_write_32(&dev->offset_hi, byte_addr >> 32);
        pio_write_32(&dev->disk_id, disk_id);
        pio_write_32(&dev->control, CTL_READ_START);

        status = pio_read_32(&dev->status);
        if (status == STATUS_FAILURE) {
                fibril_mutex_unlock(&dev_lock[disk_id]);
                return EIO;
        }

        for (i = 0; i < block_size; i++) {
                ((uint8_t *) buf)[i] = w = pio_read_8(&dev->buffer[i]);
        }

        fibril_mutex_unlock(&dev_lock[disk_id]);
        return EOK;
}

/** Write a block to the device. */
static int gxe_bd_write_block(int disk_id, uint64_t ba, const void *buf)
{
        uint32_t status;
        uint64_t byte_addr;
        size_t i;

        byte_addr = ba * block_size;

        fibril_mutex_lock(&dev_lock[disk_id]);

        for (i = 0; i < block_size; i++) {
                pio_write_8(&dev->buffer[i], ((const uint8_t *) buf)[i]);
        }

        pio_write_32(&dev->offset_lo, (uint32_t) byte_addr);
        pio_write_32(&dev->offset_hi, byte_addr >> 32);
        pio_write_32(&dev->disk_id, disk_id);
        pio_write_32(&dev->control, CTL_WRITE_START);

        status = pio_read_32(&dev->status);
        if (status == STATUS_FAILURE) {
                fibril_mutex_unlock(&dev_lock[disk_id]);
                return EIO;
        }

        fibril_mutex_unlock(&dev_lock[disk_id]);
        return EOK;
}

/**
 * @}
 */