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4411 svoboda 1
/*
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 * Copyright (c) 2009 Jiri Svoboda
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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 bd
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 * @{
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 */
32
 
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/**
34
 * @file
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 * @brief GXemul disk driver
36
 */
37
 
38
#include <stdio.h>
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#include <libarch/ddi.h>
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#include <ddi.h>
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#include <ipc/ipc.h>
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#include <ipc/bd.h>
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#include <async.h>
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#include <as.h>
4557 svoboda 45
#include <fibril_sync.h>
4411 svoboda 46
#include <devmap.h>
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#include <sys/types.h>
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#include <errno.h>
4621 svoboda 49
#include <task.h>
4411 svoboda 50
 
51
#define NAME "gxe_bd"
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53
enum {
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    CTL_READ_START  = 0,
55
    CTL_WRITE_START = 1,
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};
57
 
58
enum {
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    STATUS_FAILURE  = 0
60
};
61
 
4442 svoboda 62
enum {
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    MAX_DISKS   = 2
64
};
65
 
4411 svoboda 66
typedef struct {
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    uint32_t offset_lo;
68
    uint32_t pad0;
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    uint32_t offset_hi;
70
    uint32_t pad1;
71
 
72
    uint32_t disk_id;
73
    uint32_t pad2[3];
74
 
75
    uint32_t control;
76
    uint32_t pad3[3];
77
 
78
    uint32_t status;
79
 
80
    uint32_t pad4[3];
4440 jermar 81
    uint8_t pad5[0x3fc0];
4411 svoboda 82
 
4440 jermar 83
    uint8_t buffer[512];
4411 svoboda 84
} gxe_bd_t;
85
 
86
 
4428 svoboda 87
static const size_t block_size = 512;
88
static size_t comm_size;
89
 
4411 svoboda 90
static uintptr_t dev_physical = 0x13000000;
91
static gxe_bd_t *dev;
92
 
4442 svoboda 93
static dev_handle_t dev_handle[MAX_DISKS];
4411 svoboda 94
 
4557 svoboda 95
static fibril_mutex_t dev_lock[MAX_DISKS];
4411 svoboda 96
 
97
static int gxe_bd_init(void);
98
static void gxe_bd_connection(ipc_callid_t iid, ipc_call_t *icall);
4545 svoboda 99
static int gx_bd_rdwr(int disk_id, ipcarg_t method, off_t offset, size_t size,
4442 svoboda 100
    void *buf);
101
static int gxe_bd_read_block(int disk_id, uint64_t offset, size_t size,
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    void *buf);
103
static int gxe_bd_write_block(int disk_id, uint64_t offset, size_t size,
104
    const void *buf);
4411 svoboda 105
 
106
int main(int argc, char **argv)
107
{
108
    printf(NAME ": GXemul disk driver\n");
109
 
110
    if (gxe_bd_init() != EOK)
111
        return -1;
112
 
113
    printf(NAME ": Accepting connections\n");
4621 svoboda 114
    task_retval(0);
4411 svoboda 115
    async_manager();
116
 
117
    /* Not reached */
118
    return 0;
119
}
120
 
121
static int gxe_bd_init(void)
122
{
123
    void *vaddr;
4442 svoboda 124
    int rc, i;
125
    char name[16];
4411 svoboda 126
 
127
    rc = devmap_driver_register(NAME, gxe_bd_connection);
128
    if (rc < 0) {
129
        printf(NAME ": Unable to register driver.\n");
130
        return rc;
131
    }
132
 
133
    rc = pio_enable((void *) dev_physical, sizeof(gxe_bd_t), &vaddr);
134
    if (rc != EOK) {
135
        printf(NAME ": Could not initialize device I/O space.\n");
136
        return rc;
137
    }
138
 
139
    dev = vaddr;
140
 
4442 svoboda 141
    for (i = 0; i < MAX_DISKS; i++) {
142
        snprintf(name, 16, "disk%d", i);
143
        rc = devmap_device_register(name, &dev_handle[i]);
144
        if (rc != EOK) {
145
            devmap_hangup_phone(DEVMAP_DRIVER);
146
            printf(NAME ": Unable to register device %s.\n",
147
                name);
148
            return rc;
149
        }
4557 svoboda 150
        fibril_mutex_initialize(&dev_lock[i]);
4411 svoboda 151
    }
152
 
153
    return EOK;
154
}
155
 
156
static void gxe_bd_connection(ipc_callid_t iid, ipc_call_t *icall)
157
{
158
    void *fs_va = NULL;
159
    ipc_callid_t callid;
160
    ipc_call_t call;
4428 svoboda 161
    ipcarg_t method;
4442 svoboda 162
    dev_handle_t dh;
4411 svoboda 163
    int flags;
164
    int retval;
4428 svoboda 165
    off_t idx;
4545 svoboda 166
    size_t size;
4442 svoboda 167
    int disk_id, i;
4411 svoboda 168
 
4442 svoboda 169
    /* Get the device handle. */
170
    dh = IPC_GET_ARG1(*icall);
171
 
172
    /* Determine which disk device is the client connecting to. */
173
    disk_id = -1;
174
    for (i = 0; i < MAX_DISKS; i++)
175
        if (dev_handle[i] == dh)
176
            disk_id = i;
177
 
178
    if (disk_id < 0) {
179
        ipc_answer_0(iid, EINVAL);
180
        return;
181
    }
182
 
4411 svoboda 183
    /* Answer the IPC_M_CONNECT_ME_TO call. */
184
    ipc_answer_0(iid, EOK);
185
 
4428 svoboda 186
    if (!ipc_share_out_receive(&callid, &comm_size, &flags)) {
4411 svoboda 187
        ipc_answer_0(callid, EHANGUP);
188
        return;
189
    }
190
 
4428 svoboda 191
    fs_va = as_get_mappable_page(comm_size);
4411 svoboda 192
    if (fs_va == NULL) {
193
        ipc_answer_0(callid, EHANGUP);
194
        return;
195
    }
196
 
197
    (void) ipc_share_out_finalize(callid, fs_va);
198
 
199
    while (1) {
200
        callid = async_get_call(&call);
4428 svoboda 201
        method = IPC_GET_METHOD(call);
202
        switch (method) {
4411 svoboda 203
        case IPC_M_PHONE_HUNGUP:
204
            /* The other side has hung up. */
205
            ipc_answer_0(callid, EOK);
206
            return;
207
        case BD_READ_BLOCK:
208
        case BD_WRITE_BLOCK:
4428 svoboda 209
            idx = IPC_GET_ARG1(call);
210
            size = IPC_GET_ARG2(call);
211
            if (size > comm_size) {
212
                retval = EINVAL;
213
                break;
214
            }
4442 svoboda 215
            retval = gx_bd_rdwr(disk_id, method, idx * size,
216
                size, fs_va);
4411 svoboda 217
            break;
218
        default:
219
            retval = EINVAL;
220
            break;
221
        }
222
        ipc_answer_0(callid, retval);
223
    }
224
}
225
 
4545 svoboda 226
static int gx_bd_rdwr(int disk_id, ipcarg_t method, off_t offset, size_t size,
4442 svoboda 227
    void *buf)
4411 svoboda 228
{
4428 svoboda 229
    int rc;
230
    size_t now;
231
 
232
    while (size > 0) {
233
        now = size < block_size ? size : block_size;
234
 
235
        if (method == BD_READ_BLOCK)
4442 svoboda 236
            rc = gxe_bd_read_block(disk_id, offset, now, buf);
4428 svoboda 237
        else
4442 svoboda 238
            rc = gxe_bd_write_block(disk_id, offset, now, buf);
4428 svoboda 239
 
240
        if (rc != EOK)
241
            return rc;
242
 
243
        buf += block_size;
244
        offset += block_size;
245
 
246
        if (size > block_size)
247
            size -= block_size;
248
        else
249
            size = 0;
250
    }
251
 
252
    return EOK;
253
}
254
 
4442 svoboda 255
static int gxe_bd_read_block(int disk_id, uint64_t offset, size_t size,
256
    void *buf)
4428 svoboda 257
{
4411 svoboda 258
    uint32_t status;
259
    size_t i;
260
    uint32_t w;
261
 
4557 svoboda 262
    fibril_mutex_lock(&dev_lock[disk_id]);
4411 svoboda 263
    pio_write_32(&dev->offset_lo, (uint32_t) offset);
264
    pio_write_32(&dev->offset_hi, offset >> 32);
265
    pio_write_32(&dev->disk_id, disk_id);
266
    pio_write_32(&dev->control, CTL_READ_START);
267
 
268
    status = pio_read_32(&dev->status);
269
    if (status == STATUS_FAILURE) {
4557 svoboda 270
        fibril_mutex_unlock(&dev_lock[disk_id]);
4411 svoboda 271
        return EIO;
272
    }
273
 
4428 svoboda 274
    for (i = 0; i < size; i++) {
4440 jermar 275
        ((uint8_t *) buf)[i] = w = pio_read_8(&dev->buffer[i]);
4411 svoboda 276
    }
277
 
4557 svoboda 278
    fibril_mutex_unlock(&dev_lock[disk_id]);
4411 svoboda 279
    return EOK;
280
}
281
 
4442 svoboda 282
static int gxe_bd_write_block(int disk_id, uint64_t offset, size_t size,
283
    const void *buf)
4411 svoboda 284
{
285
    uint32_t status;
286
    size_t i;
287
 
4428 svoboda 288
    for (i = 0; i < size; i++) {
4440 jermar 289
        pio_write_8(&dev->buffer[i], ((const uint8_t *) buf)[i]);
4411 svoboda 290
    }
291
 
4557 svoboda 292
    fibril_mutex_lock(&dev_lock[disk_id]);
4411 svoboda 293
    pio_write_32(&dev->offset_lo, (uint32_t) offset);
294
    pio_write_32(&dev->offset_hi, offset >> 32);
295
    pio_write_32(&dev->disk_id, disk_id);
296
    pio_write_32(&dev->control, CTL_WRITE_START);
297
 
298
    status = pio_read_32(&dev->status);
299
    if (status == STATUS_FAILURE) {
4557 svoboda 300
        fibril_mutex_unlock(&dev_lock[disk_id]);
4411 svoboda 301
        return EIO;
302
    }
303
 
4557 svoboda 304
    fibril_mutex_unlock(&dev_lock[disk_id]);
4411 svoboda 305
    return EOK;
306
}
307
 
308
/**
309
 * @}
310
 */