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1 /*
2 * QEMU Floppy disk emulator (Intel 82078)
3 *
4 * Copyright (c) 2003, 2007 Jocelyn Mayer
5 * Copyright (c) 2008 Hervé Poussineau
6 *
7 * Permission is hereby granted, free of charge, to any person obtaining a copy
8 * of this software and associated documentation files (the "Software"), to deal
9 * in the Software without restriction, including without limitation the rights
10 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
11 * copies of the Software, and to permit persons to whom the Software is
12 * furnished to do so, subject to the following conditions:
13 *
14 * The above copyright notice and this permission notice shall be included in
15 * all copies or substantial portions of the Software.
16 *
17 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
18 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
19 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
20 * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
21 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
22 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
23 * THE SOFTWARE.
24 */
25 #ifndef HW_BLOCK_FDC_INTERNAL_H
26 #define HW_BLOCK_FDC_INTERNAL_H
27
28 #include "hw/block/block.h"
29 #include "hw/block/fdc.h"
30 #include "qapi/qapi-types-block.h"
31
32 typedef struct FDCtrl FDCtrl;
33
34 /* Floppy bus emulation */
35
36 typedef struct FloppyBus {
37 BusState bus;
38 FDCtrl *fdc;
39 } FloppyBus;
40
41 /* Floppy disk drive emulation */
42
43 typedef enum FDriveRate {
44 FDRIVE_RATE_500K = 0x00, /* 500 Kbps */
45 FDRIVE_RATE_300K = 0x01, /* 300 Kbps */
46 FDRIVE_RATE_250K = 0x02, /* 250 Kbps */
47 FDRIVE_RATE_1M = 0x03, /* 1 Mbps */
48 } FDriveRate;
49
50 typedef enum FDriveSize {
51 FDRIVE_SIZE_UNKNOWN,
52 FDRIVE_SIZE_350,
53 FDRIVE_SIZE_525,
54 } FDriveSize;
55
56 typedef struct FDFormat {
57 FloppyDriveType drive;
58 uint8_t last_sect;
59 uint8_t max_track;
60 uint8_t max_head;
61 FDriveRate rate;
62 } FDFormat;
63
64 typedef enum FDiskFlags {
65 FDISK_DBL_SIDES = 0x01,
66 } FDiskFlags;
67
68 typedef struct FDrive {
69 FDCtrl *fdctrl;
70 BlockBackend *blk;
71 BlockConf *conf;
72 /* Drive status */
73 FloppyDriveType drive; /* CMOS drive type */
74 uint8_t perpendicular; /* 2.88 MB access mode */
75 /* Position */
76 uint8_t head;
77 uint8_t track;
78 uint8_t sect;
79 /* Media */
80 FloppyDriveType disk; /* Current disk type */
81 FDiskFlags flags;
82 uint8_t last_sect; /* Nb sector per track */
83 uint8_t max_track; /* Nb of tracks */
84 uint16_t bps; /* Bytes per sector */
85 uint8_t ro; /* Is read-only */
86 uint8_t media_changed; /* Is media changed */
87 uint8_t media_rate; /* Data rate of medium */
88
89 bool media_validated; /* Have we validated the media? */
90 } FDrive;
91
92 struct FDCtrl {
93 qemu_irq irq;
94 /* Controller state */
95 QEMUTimer *result_timer;
96 int dma_chann;
97 uint8_t phase;
98 IsaDma *dma;
99 /* Controller's identification */
100 uint8_t version;
101 /* HW */
102 uint8_t sra;
103 uint8_t srb;
104 uint8_t dor;
105 uint8_t dor_vmstate; /* only used as temp during vmstate */
106 uint8_t tdr;
107 uint8_t dsr;
108 uint8_t msr;
109 uint8_t cur_drv;
110 uint8_t status0;
111 uint8_t status1;
112 uint8_t status2;
113 /* Command FIFO */
114 uint8_t *fifo;
115 int32_t fifo_size;
116 uint32_t data_pos;
117 uint32_t data_len;
118 uint8_t data_state;
119 uint8_t data_dir;
120 uint8_t eot; /* last wanted sector */
121 /* States kept only to be returned back */
122 /* precompensation */
123 uint8_t precomp_trk;
124 uint8_t config;
125 uint8_t lock;
126 /* Power down config (also with status regB access mode */
127 uint8_t pwrd;
128 /* Floppy drives */
129 FloppyBus bus;
130 uint8_t num_floppies;
131 FDrive drives[MAX_FD];
132 struct {
133 FloppyDriveType type;
134 } qdev_for_drives[MAX_FD];
135 int reset_sensei;
136 FloppyDriveType fallback; /* type=auto failure fallback */
137 /* Timers state */
138 uint8_t timer0;
139 uint8_t timer1;
140 };
141
142 extern const FDFormat fd_formats[];
143 extern const VMStateDescription vmstate_fdc;
144
145 uint32_t fdctrl_read(void *opaque, uint32_t reg);
146 void fdctrl_write(void *opaque, uint32_t reg, uint32_t value);
147 void fdctrl_reset(FDCtrl *fdctrl, int do_irq);
148 void fdctrl_realize_common(DeviceState *dev, FDCtrl *fdctrl, Error **errp);
149
150 int fdctrl_transfer_handler(void *opaque, int nchan, int dma_pos, int dma_len);
151
152 void fdctrl_init_drives(FloppyBus *bus, DriveInfo **fds);
153
154 #endif