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qcow2: Split out snapshot functions
[qemu/aliguori-queue.git] / hw / fdc.c
blob4c6284cebb4079e1e8f7690eb5cc5ff631b8a3e6
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 /*
26 * The controller is used in Sun4m systems in a slightly different
27 * way. There are changes in DOR register and DMA is not available.
28 */
29 #include "hw.h"
30 #include "fdc.h"
31 #include "block.h"
32 #include "qemu-timer.h"
33 #include "isa.h"
34
35 /********************************************************/
36 /* debug Floppy devices */
37 //#define DEBUG_FLOPPY
38
39 #ifdef DEBUG_FLOPPY
40 #define FLOPPY_DPRINTF(fmt, ...) \
41 do { printf("FLOPPY: " fmt , ## __VA_ARGS__); } while (0)
42 #else
43 #define FLOPPY_DPRINTF(fmt, ...)
44 #endif
45
46 #define FLOPPY_ERROR(fmt, ...) \
47 do { printf("FLOPPY ERROR: %s: " fmt, __func__ , ## __VA_ARGS__); } while (0)
48
49 /********************************************************/
50 /* Floppy drive emulation */
51
52 #define GET_CUR_DRV(fdctrl) ((fdctrl)->cur_drv)
53 #define SET_CUR_DRV(fdctrl, drive) ((fdctrl)->cur_drv = (drive))
54
55 /* Will always be a fixed parameter for us */
56 #define FD_SECTOR_LEN 512
57 #define FD_SECTOR_SC 2 /* Sector size code */
58 #define FD_RESET_SENSEI_COUNT 4 /* Number of sense interrupts on RESET */
59
60 /* Floppy disk drive emulation */
61 typedef enum fdisk_type_t {
62 FDRIVE_DISK_288 = 0x01, /* 2.88 MB disk */
63 FDRIVE_DISK_144 = 0x02, /* 1.44 MB disk */
64 FDRIVE_DISK_720 = 0x03, /* 720 kB disk */
65 FDRIVE_DISK_USER = 0x04, /* User defined geometry */
66 FDRIVE_DISK_NONE = 0x05, /* No disk */
67 } fdisk_type_t;
68
69 typedef enum fdrive_type_t {
70 FDRIVE_DRV_144 = 0x00, /* 1.44 MB 3"5 drive */
71 FDRIVE_DRV_288 = 0x01, /* 2.88 MB 3"5 drive */
72 FDRIVE_DRV_120 = 0x02, /* 1.2 MB 5"25 drive */
73 FDRIVE_DRV_NONE = 0x03, /* No drive connected */
74 } fdrive_type_t;
75
76 typedef enum fdisk_flags_t {
77 FDISK_DBL_SIDES = 0x01,
78 } fdisk_flags_t;
79
80 typedef struct fdrive_t {
81 BlockDriverState *bs;
82 /* Drive status */
83 fdrive_type_t drive;
84 uint8_t perpendicular; /* 2.88 MB access mode */
85 /* Position */
86 uint8_t head;
87 uint8_t track;
88 uint8_t sect;
89 /* Media */
90 fdisk_flags_t flags;
91 uint8_t last_sect; /* Nb sector per track */
92 uint8_t max_track; /* Nb of tracks */
93 uint16_t bps; /* Bytes per sector */
94 uint8_t ro; /* Is read-only */
95 } fdrive_t;
96
97 static void fd_init (fdrive_t *drv, BlockDriverState *bs)
98 {
99 /* Drive */
100 drv->bs = bs;
101 drv->drive = FDRIVE_DRV_NONE;
102 drv->perpendicular = 0;
103 /* Disk */
104 drv->last_sect = 0;
105 drv->max_track = 0;
106 }
107
108 static int _fd_sector (uint8_t head, uint8_t track,
109 uint8_t sect, uint8_t last_sect)
110 {
111 return (((track * 2) + head) * last_sect) + sect - 1;
112 }
113
114 /* Returns current position, in sectors, for given drive */
115 static int fd_sector (fdrive_t *drv)
116 {
117 return _fd_sector(drv->head, drv->track, drv->sect, drv->last_sect);
118 }
119
120 /* Seek to a new position:
121 * returns 0 if already on right track
122 * returns 1 if track changed
123 * returns 2 if track is invalid
124 * returns 3 if sector is invalid
125 * returns 4 if seek is disabled
126 */
127 static int fd_seek (fdrive_t *drv, uint8_t head, uint8_t track, uint8_t sect,
128 int enable_seek)
129 {
130 uint32_t sector;
131 int ret;
132
133 if (track > drv->max_track ||
134 (head != 0 && (drv->flags & FDISK_DBL_SIDES) == 0)) {
135 FLOPPY_DPRINTF("try to read %d %02x %02x (max=%d %d %02x %02x)\n",
136 head, track, sect, 1,
137 (drv->flags & FDISK_DBL_SIDES) == 0 ? 0 : 1,
138 drv->max_track, drv->last_sect);
139 return 2;
140 }
141 if (sect > drv->last_sect) {
142 FLOPPY_DPRINTF("try to read %d %02x %02x (max=%d %d %02x %02x)\n",
143 head, track, sect, 1,
144 (drv->flags & FDISK_DBL_SIDES) == 0 ? 0 : 1,
145 drv->max_track, drv->last_sect);
146 return 3;
147 }
148 sector = _fd_sector(head, track, sect, drv->last_sect);
149 ret = 0;
150 if (sector != fd_sector(drv)) {
151 #if 0
152 if (!enable_seek) {
153 FLOPPY_ERROR("no implicit seek %d %02x %02x (max=%d %02x %02x)\n",
154 head, track, sect, 1, drv->max_track, drv->last_sect);
155 return 4;
156 }
157 #endif
158 drv->head = head;
159 if (drv->track != track)
160 ret = 1;
161 drv->track = track;
162 drv->sect = sect;
163 }
164
165 return ret;
166 }
167
168 /* Set drive back to track 0 */
169 static void fd_recalibrate (fdrive_t *drv)
170 {
171 FLOPPY_DPRINTF("recalibrate\n");
172 drv->head = 0;
173 drv->track = 0;
174 drv->sect = 1;
175 }
176
177 /* Recognize floppy formats */
178 typedef struct fd_format_t {
179 fdrive_type_t drive;
180 fdisk_type_t disk;
181 uint8_t last_sect;
182 uint8_t max_track;
183 uint8_t max_head;
184 const char *str;
185 } fd_format_t;
186
187 static const fd_format_t fd_formats[] = {
188 /* First entry is default format */
189 /* 1.44 MB 3"1/2 floppy disks */
190 { FDRIVE_DRV_144, FDRIVE_DISK_144, 18, 80, 1, "1.44 MB 3\"1/2", },
191 { FDRIVE_DRV_144, FDRIVE_DISK_144, 20, 80, 1, "1.6 MB 3\"1/2", },
192 { FDRIVE_DRV_144, FDRIVE_DISK_144, 21, 80, 1, "1.68 MB 3\"1/2", },
193 { FDRIVE_DRV_144, FDRIVE_DISK_144, 21, 82, 1, "1.72 MB 3\"1/2", },
194 { FDRIVE_DRV_144, FDRIVE_DISK_144, 21, 83, 1, "1.74 MB 3\"1/2", },
195 { FDRIVE_DRV_144, FDRIVE_DISK_144, 22, 80, 1, "1.76 MB 3\"1/2", },
196 { FDRIVE_DRV_144, FDRIVE_DISK_144, 23, 80, 1, "1.84 MB 3\"1/2", },
197 { FDRIVE_DRV_144, FDRIVE_DISK_144, 24, 80, 1, "1.92 MB 3\"1/2", },
198 /* 2.88 MB 3"1/2 floppy disks */
199 { FDRIVE_DRV_288, FDRIVE_DISK_288, 36, 80, 1, "2.88 MB 3\"1/2", },
200 { FDRIVE_DRV_288, FDRIVE_DISK_288, 39, 80, 1, "3.12 MB 3\"1/2", },
201 { FDRIVE_DRV_288, FDRIVE_DISK_288, 40, 80, 1, "3.2 MB 3\"1/2", },
202 { FDRIVE_DRV_288, FDRIVE_DISK_288, 44, 80, 1, "3.52 MB 3\"1/2", },
203 { FDRIVE_DRV_288, FDRIVE_DISK_288, 48, 80, 1, "3.84 MB 3\"1/2", },
204 /* 720 kB 3"1/2 floppy disks */
205 { FDRIVE_DRV_144, FDRIVE_DISK_720, 9, 80, 1, "720 kB 3\"1/2", },
206 { FDRIVE_DRV_144, FDRIVE_DISK_720, 10, 80, 1, "800 kB 3\"1/2", },
207 { FDRIVE_DRV_144, FDRIVE_DISK_720, 10, 82, 1, "820 kB 3\"1/2", },
208 { FDRIVE_DRV_144, FDRIVE_DISK_720, 10, 83, 1, "830 kB 3\"1/2", },
209 { FDRIVE_DRV_144, FDRIVE_DISK_720, 13, 80, 1, "1.04 MB 3\"1/2", },
210 { FDRIVE_DRV_144, FDRIVE_DISK_720, 14, 80, 1, "1.12 MB 3\"1/2", },
211 /* 1.2 MB 5"1/4 floppy disks */
212 { FDRIVE_DRV_120, FDRIVE_DISK_288, 15, 80, 1, "1.2 kB 5\"1/4", },
213 { FDRIVE_DRV_120, FDRIVE_DISK_288, 18, 80, 1, "1.44 MB 5\"1/4", },
214 { FDRIVE_DRV_120, FDRIVE_DISK_288, 18, 82, 1, "1.48 MB 5\"1/4", },
215 { FDRIVE_DRV_120, FDRIVE_DISK_288, 18, 83, 1, "1.49 MB 5\"1/4", },
216 { FDRIVE_DRV_120, FDRIVE_DISK_288, 20, 80, 1, "1.6 MB 5\"1/4", },
217 /* 720 kB 5"1/4 floppy disks */
218 { FDRIVE_DRV_120, FDRIVE_DISK_288, 9, 80, 1, "720 kB 5\"1/4", },
219 { FDRIVE_DRV_120, FDRIVE_DISK_288, 11, 80, 1, "880 kB 5\"1/4", },
220 /* 360 kB 5"1/4 floppy disks */
221 { FDRIVE_DRV_120, FDRIVE_DISK_288, 9, 40, 1, "360 kB 5\"1/4", },
222 { FDRIVE_DRV_120, FDRIVE_DISK_288, 9, 40, 0, "180 kB 5\"1/4", },
223 { FDRIVE_DRV_120, FDRIVE_DISK_288, 10, 41, 1, "410 kB 5\"1/4", },
224 { FDRIVE_DRV_120, FDRIVE_DISK_288, 10, 42, 1, "420 kB 5\"1/4", },
225 /* 320 kB 5"1/4 floppy disks */
226 { FDRIVE_DRV_120, FDRIVE_DISK_288, 8, 40, 1, "320 kB 5\"1/4", },
227 { FDRIVE_DRV_120, FDRIVE_DISK_288, 8, 40, 0, "160 kB 5\"1/4", },
228 /* 360 kB must match 5"1/4 better than 3"1/2... */
229 { FDRIVE_DRV_144, FDRIVE_DISK_720, 9, 80, 0, "360 kB 3\"1/2", },
230 /* end */
231 { FDRIVE_DRV_NONE, FDRIVE_DISK_NONE, -1, -1, 0, NULL, },
232 };
233
234 /* Revalidate a disk drive after a disk change */
235 static void fd_revalidate (fdrive_t *drv)
236 {
237 const fd_format_t *parse;
238 uint64_t nb_sectors, size;
239 int i, first_match, match;
240 int nb_heads, max_track, last_sect, ro;
241
242 FLOPPY_DPRINTF("revalidate\n");
243 if (drv->bs != NULL && bdrv_is_inserted(drv->bs)) {
244 ro = bdrv_is_read_only(drv->bs);
245 bdrv_get_geometry_hint(drv->bs, &nb_heads, &max_track, &last_sect);
246 if (nb_heads != 0 && max_track != 0 && last_sect != 0) {
247 FLOPPY_DPRINTF("User defined disk (%d %d %d)",
248 nb_heads - 1, max_track, last_sect);
249 } else {
250 bdrv_get_geometry(drv->bs, &nb_sectors);
251 match = -1;
252 first_match = -1;
253 for (i = 0;; i++) {
254 parse = &fd_formats[i];
255 if (parse->drive == FDRIVE_DRV_NONE)
256 break;
257 if (drv->drive == parse->drive ||
258 drv->drive == FDRIVE_DRV_NONE) {
259 size = (parse->max_head + 1) * parse->max_track *
260 parse->last_sect;
261 if (nb_sectors == size) {
262 match = i;
263 break;
264 }
265 if (first_match == -1)
266 first_match = i;
267 }
268 }
269 if (match == -1) {
270 if (first_match == -1)
271 match = 1;
272 else
273 match = first_match;
274 parse = &fd_formats[match];
275 }
276 nb_heads = parse->max_head + 1;
277 max_track = parse->max_track;
278 last_sect = parse->last_sect;
279 drv->drive = parse->drive;
280 FLOPPY_DPRINTF("%s floppy disk (%d h %d t %d s) %s\n", parse->str,
281 nb_heads, max_track, last_sect, ro ? "ro" : "rw");
282 }
283 if (nb_heads == 1) {
284 drv->flags &= ~FDISK_DBL_SIDES;
285 } else {
286 drv->flags |= FDISK_DBL_SIDES;
287 }
288 drv->max_track = max_track;
289 drv->last_sect = last_sect;
290 drv->ro = ro;
291 } else {
292 FLOPPY_DPRINTF("No disk in drive\n");
293 drv->last_sect = 0;
294 drv->max_track = 0;
295 drv->flags &= ~FDISK_DBL_SIDES;
296 }
297 }
298
299 /********************************************************/
300 /* Intel 82078 floppy disk controller emulation */
301
302 static void fdctrl_reset (fdctrl_t *fdctrl, int do_irq);
303 static void fdctrl_reset_fifo (fdctrl_t *fdctrl);
304 static int fdctrl_transfer_handler (void *opaque, int nchan,
305 int dma_pos, int dma_len);
306 static void fdctrl_raise_irq (fdctrl_t *fdctrl, uint8_t status0);
307
308 static uint32_t fdctrl_read_statusA (fdctrl_t *fdctrl);
309 static uint32_t fdctrl_read_statusB (fdctrl_t *fdctrl);
310 static uint32_t fdctrl_read_dor (fdctrl_t *fdctrl);
311 static void fdctrl_write_dor (fdctrl_t *fdctrl, uint32_t value);
312 static uint32_t fdctrl_read_tape (fdctrl_t *fdctrl);
313 static void fdctrl_write_tape (fdctrl_t *fdctrl, uint32_t value);
314 static uint32_t fdctrl_read_main_status (fdctrl_t *fdctrl);
315 static void fdctrl_write_rate (fdctrl_t *fdctrl, uint32_t value);
316 static uint32_t fdctrl_read_data (fdctrl_t *fdctrl);
317 static void fdctrl_write_data (fdctrl_t *fdctrl, uint32_t value);
318 static uint32_t fdctrl_read_dir (fdctrl_t *fdctrl);
319
320 enum {
321 FD_DIR_WRITE = 0,
322 FD_DIR_READ = 1,
323 FD_DIR_SCANE = 2,
324 FD_DIR_SCANL = 3,
325 FD_DIR_SCANH = 4,
326 };
327
328 enum {
329 FD_STATE_MULTI = 0x01, /* multi track flag */
330 FD_STATE_FORMAT = 0x02, /* format flag */
331 FD_STATE_SEEK = 0x04, /* seek flag */
332 };
333
334 enum {
335 FD_REG_SRA = 0x00,
336 FD_REG_SRB = 0x01,
337 FD_REG_DOR = 0x02,
338 FD_REG_TDR = 0x03,
339 FD_REG_MSR = 0x04,
340 FD_REG_DSR = 0x04,
341 FD_REG_FIFO = 0x05,
342 FD_REG_DIR = 0x07,
343 };
344
345 enum {
346 FD_CMD_READ_TRACK = 0x02,
347 FD_CMD_SPECIFY = 0x03,
348 FD_CMD_SENSE_DRIVE_STATUS = 0x04,
349 FD_CMD_WRITE = 0x05,
350 FD_CMD_READ = 0x06,
351 FD_CMD_RECALIBRATE = 0x07,
352 FD_CMD_SENSE_INTERRUPT_STATUS = 0x08,
353 FD_CMD_WRITE_DELETED = 0x09,
354 FD_CMD_READ_ID = 0x0a,
355 FD_CMD_READ_DELETED = 0x0c,
356 FD_CMD_FORMAT_TRACK = 0x0d,
357 FD_CMD_DUMPREG = 0x0e,
358 FD_CMD_SEEK = 0x0f,
359 FD_CMD_VERSION = 0x10,
360 FD_CMD_SCAN_EQUAL = 0x11,
361 FD_CMD_PERPENDICULAR_MODE = 0x12,
362 FD_CMD_CONFIGURE = 0x13,
363 FD_CMD_LOCK = 0x14,
364 FD_CMD_VERIFY = 0x16,
365 FD_CMD_POWERDOWN_MODE = 0x17,
366 FD_CMD_PART_ID = 0x18,
367 FD_CMD_SCAN_LOW_OR_EQUAL = 0x19,
368 FD_CMD_SCAN_HIGH_OR_EQUAL = 0x1d,
369 FD_CMD_SAVE = 0x2c,
370 FD_CMD_OPTION = 0x33,
371 FD_CMD_RESTORE = 0x4c,
372 FD_CMD_DRIVE_SPECIFICATION_COMMAND = 0x8e,
373 FD_CMD_RELATIVE_SEEK_OUT = 0x8f,
374 FD_CMD_FORMAT_AND_WRITE = 0xcd,
375 FD_CMD_RELATIVE_SEEK_IN = 0xcf,
376 };
377
378 enum {
379 FD_CONFIG_PRETRK = 0xff, /* Pre-compensation set to track 0 */
380 FD_CONFIG_FIFOTHR = 0x0f, /* FIFO threshold set to 1 byte */
381 FD_CONFIG_POLL = 0x10, /* Poll enabled */
382 FD_CONFIG_EFIFO = 0x20, /* FIFO disabled */
383 FD_CONFIG_EIS = 0x40, /* No implied seeks */
384 };
385
386 enum {
387 FD_SR0_EQPMT = 0x10,
388 FD_SR0_SEEK = 0x20,
389 FD_SR0_ABNTERM = 0x40,
390 FD_SR0_INVCMD = 0x80,
391 FD_SR0_RDYCHG = 0xc0,
392 };
393
394 enum {
395 FD_SR1_EC = 0x80, /* End of cylinder */
396 };
397
398 enum {
399 FD_SR2_SNS = 0x04, /* Scan not satisfied */
400 FD_SR2_SEH = 0x08, /* Scan equal hit */
401 };
402
403 enum {
404 FD_SRA_DIR = 0x01,
405 FD_SRA_nWP = 0x02,
406 FD_SRA_nINDX = 0x04,
407 FD_SRA_HDSEL = 0x08,
408 FD_SRA_nTRK0 = 0x10,
409 FD_SRA_STEP = 0x20,
410 FD_SRA_nDRV2 = 0x40,
411 FD_SRA_INTPEND = 0x80,
412 };
413
414 enum {
415 FD_SRB_MTR0 = 0x01,
416 FD_SRB_MTR1 = 0x02,
417 FD_SRB_WGATE = 0x04,
418 FD_SRB_RDATA = 0x08,
419 FD_SRB_WDATA = 0x10,
420 FD_SRB_DR0 = 0x20,
421 };
422
423 enum {
424 #if MAX_FD == 4
425 FD_DOR_SELMASK = 0x03,
426 #else
427 FD_DOR_SELMASK = 0x01,
428 #endif
429 FD_DOR_nRESET = 0x04,
430 FD_DOR_DMAEN = 0x08,
431 FD_DOR_MOTEN0 = 0x10,
432 FD_DOR_MOTEN1 = 0x20,
433 FD_DOR_MOTEN2 = 0x40,
434 FD_DOR_MOTEN3 = 0x80,
435 };
436
437 enum {
438 #if MAX_FD == 4
439 FD_TDR_BOOTSEL = 0x0c,
440 #else
441 FD_TDR_BOOTSEL = 0x04,
442 #endif
443 };
444
445 enum {
446 FD_DSR_DRATEMASK= 0x03,
447 FD_DSR_PWRDOWN = 0x40,
448 FD_DSR_SWRESET = 0x80,
449 };
450
451 enum {
452 FD_MSR_DRV0BUSY = 0x01,
453 FD_MSR_DRV1BUSY = 0x02,
454 FD_MSR_DRV2BUSY = 0x04,
455 FD_MSR_DRV3BUSY = 0x08,
456 FD_MSR_CMDBUSY = 0x10,
457 FD_MSR_NONDMA = 0x20,
458 FD_MSR_DIO = 0x40,
459 FD_MSR_RQM = 0x80,
460 };
461
462 enum {
463 FD_DIR_DSKCHG = 0x80,
464 };
465
466 #define FD_MULTI_TRACK(state) ((state) & FD_STATE_MULTI)
467 #define FD_DID_SEEK(state) ((state) & FD_STATE_SEEK)
468 #define FD_FORMAT_CMD(state) ((state) & FD_STATE_FORMAT)
469
470 struct fdctrl_t {
471 /* Controller's identification */
472 uint8_t version;
473 /* HW */
474 qemu_irq irq;
475 int dma_chann;
476 target_phys_addr_t io_base;
477 /* Controller state */
478 QEMUTimer *result_timer;
479 uint8_t sra;
480 uint8_t srb;
481 uint8_t dor;
482 uint8_t tdr;
483 uint8_t dsr;
484 uint8_t msr;
485 uint8_t cur_drv;
486 uint8_t status0;
487 uint8_t status1;
488 uint8_t status2;
489 /* Command FIFO */
490 uint8_t *fifo;
491 uint32_t data_pos;
492 uint32_t data_len;
493 uint8_t data_state;
494 uint8_t data_dir;
495 uint8_t eot; /* last wanted sector */
496 /* States kept only to be returned back */
497 /* Timers state */
498 uint8_t timer0;
499 uint8_t timer1;
500 /* precompensation */
501 uint8_t precomp_trk;
502 uint8_t config;
503 uint8_t lock;
504 /* Power down config (also with status regB access mode */
505 uint8_t pwrd;
506 /* Sun4m quirks? */
507 int sun4m;
508 /* Floppy drives */
509 fdrive_t drives[MAX_FD];
510 int reset_sensei;
511 };
512
513 static uint32_t fdctrl_read (void *opaque, uint32_t reg)
514 {
515 fdctrl_t *fdctrl = opaque;
516 uint32_t retval;
517
518 switch (reg) {
519 case FD_REG_SRA:
520 retval = fdctrl_read_statusA(fdctrl);
521 break;
522 case FD_REG_SRB:
523 retval = fdctrl_read_statusB(fdctrl);
524 break;
525 case FD_REG_DOR:
526 retval = fdctrl_read_dor(fdctrl);
527 break;
528 case FD_REG_TDR:
529 retval = fdctrl_read_tape(fdctrl);
530 break;
531 case FD_REG_MSR:
532 retval = fdctrl_read_main_status(fdctrl);
533 break;
534 case FD_REG_FIFO:
535 retval = fdctrl_read_data(fdctrl);
536 break;
537 case FD_REG_DIR:
538 retval = fdctrl_read_dir(fdctrl);
539 break;
540 default:
541 retval = (uint32_t)(-1);
542 break;
543 }
544 FLOPPY_DPRINTF("read reg%d: 0x%02x\n", reg & 7, retval);
545
546 return retval;
547 }
548
549 static void fdctrl_write (void *opaque, uint32_t reg, uint32_t value)
550 {
551 fdctrl_t *fdctrl = opaque;
552
553 FLOPPY_DPRINTF("write reg%d: 0x%02x\n", reg & 7, value);
554
555 switch (reg) {
556 case FD_REG_DOR:
557 fdctrl_write_dor(fdctrl, value);
558 break;
559 case FD_REG_TDR:
560 fdctrl_write_tape(fdctrl, value);
561 break;
562 case FD_REG_DSR:
563 fdctrl_write_rate(fdctrl, value);
564 break;
565 case FD_REG_FIFO:
566 fdctrl_write_data(fdctrl, value);
567 break;
568 default:
569 break;
570 }
571 }
572
573 static uint32_t fdctrl_read_port (void *opaque, uint32_t reg)
574 {
575 return fdctrl_read(opaque, reg & 7);
576 }
577
578 static void fdctrl_write_port (void *opaque, uint32_t reg, uint32_t value)
579 {
580 fdctrl_write(opaque, reg & 7, value);
581 }
582
583 static uint32_t fdctrl_read_mem (void *opaque, target_phys_addr_t reg)
584 {
585 return fdctrl_read(opaque, (uint32_t)reg);
586 }
587
588 static void fdctrl_write_mem (void *opaque,
589 target_phys_addr_t reg, uint32_t value)
590 {
591 fdctrl_write(opaque, (uint32_t)reg, value);
592 }
593
594 static CPUReadMemoryFunc *fdctrl_mem_read[3] = {
595 fdctrl_read_mem,
596 fdctrl_read_mem,
597 fdctrl_read_mem,
598 };
599
600 static CPUWriteMemoryFunc *fdctrl_mem_write[3] = {
601 fdctrl_write_mem,
602 fdctrl_write_mem,
603 fdctrl_write_mem,
604 };
605
606 static CPUReadMemoryFunc *fdctrl_mem_read_strict[3] = {
607 fdctrl_read_mem,
608 NULL,
609 NULL,
610 };
611
612 static CPUWriteMemoryFunc *fdctrl_mem_write_strict[3] = {
613 fdctrl_write_mem,
614 NULL,
615 NULL,
616 };
617
618 static void fd_save (QEMUFile *f, fdrive_t *fd)
619 {
620 qemu_put_8s(f, &fd->head);
621 qemu_put_8s(f, &fd->track);
622 qemu_put_8s(f, &fd->sect);
623 }
624
625 static void fdc_save (QEMUFile *f, void *opaque)
626 {
627 fdctrl_t *s = opaque;
628 uint8_t tmp;
629 int i;
630 uint8_t dor = s->dor | GET_CUR_DRV(s);
631
632 /* Controller state */
633 qemu_put_8s(f, &s->sra);
634 qemu_put_8s(f, &s->srb);
635 qemu_put_8s(f, &dor);
636 qemu_put_8s(f, &s->tdr);
637 qemu_put_8s(f, &s->dsr);
638 qemu_put_8s(f, &s->msr);
639 qemu_put_8s(f, &s->status0);
640 qemu_put_8s(f, &s->status1);
641 qemu_put_8s(f, &s->status2);
642 /* Command FIFO */
643 qemu_put_buffer(f, s->fifo, FD_SECTOR_LEN);
644 qemu_put_be32s(f, &s->data_pos);
645 qemu_put_be32s(f, &s->data_len);
646 qemu_put_8s(f, &s->data_state);
647 qemu_put_8s(f, &s->data_dir);
648 qemu_put_8s(f, &s->eot);
649 /* States kept only to be returned back */
650 qemu_put_8s(f, &s->timer0);
651 qemu_put_8s(f, &s->timer1);
652 qemu_put_8s(f, &s->precomp_trk);
653 qemu_put_8s(f, &s->config);
654 qemu_put_8s(f, &s->lock);
655 qemu_put_8s(f, &s->pwrd);
656
657 tmp = MAX_FD;
658 qemu_put_8s(f, &tmp);
659 for (i = 0; i < MAX_FD; i++)
660 fd_save(f, &s->drives[i]);
661 }
662
663 static int fd_load (QEMUFile *f, fdrive_t *fd)
664 {
665 qemu_get_8s(f, &fd->head);
666 qemu_get_8s(f, &fd->track);
667 qemu_get_8s(f, &fd->sect);
668
669 return 0;
670 }
671
672 static int fdc_load (QEMUFile *f, void *opaque, int version_id)
673 {
674 fdctrl_t *s = opaque;
675 int i, ret = 0;
676 uint8_t n;
677
678 if (version_id != 2)
679 return -EINVAL;
680
681 /* Controller state */
682 qemu_get_8s(f, &s->sra);
683 qemu_get_8s(f, &s->srb);
684 qemu_get_8s(f, &s->dor);
685 SET_CUR_DRV(s, s->dor & FD_DOR_SELMASK);
686 s->dor &= ~FD_DOR_SELMASK;
687 qemu_get_8s(f, &s->tdr);
688 qemu_get_8s(f, &s->dsr);
689 qemu_get_8s(f, &s->msr);
690 qemu_get_8s(f, &s->status0);
691 qemu_get_8s(f, &s->status1);
692 qemu_get_8s(f, &s->status2);
693 /* Command FIFO */
694 qemu_get_buffer(f, s->fifo, FD_SECTOR_LEN);
695 qemu_get_be32s(f, &s->data_pos);
696 qemu_get_be32s(f, &s->data_len);
697 qemu_get_8s(f, &s->data_state);
698 qemu_get_8s(f, &s->data_dir);
699 qemu_get_8s(f, &s->eot);
700 /* States kept only to be returned back */
701 qemu_get_8s(f, &s->timer0);
702 qemu_get_8s(f, &s->timer1);
703 qemu_get_8s(f, &s->precomp_trk);
704 qemu_get_8s(f, &s->config);
705 qemu_get_8s(f, &s->lock);
706 qemu_get_8s(f, &s->pwrd);
707 qemu_get_8s(f, &n);
708
709 if (n > MAX_FD)
710 return -EINVAL;
711
712 for (i = 0; i < n; i++) {
713 ret = fd_load(f, &s->drives[i]);
714 if (ret != 0)
715 break;
716 }
717
718 return ret;
719 }
720
721 static void fdctrl_external_reset(void *opaque)
722 {
723 fdctrl_t *s = opaque;
724
725 fdctrl_reset(s, 0);
726 }
727
728 static void fdctrl_handle_tc(void *opaque, int irq, int level)
729 {
730 //fdctrl_t *s = opaque;
731
732 if (level) {
733 // XXX
734 FLOPPY_DPRINTF("TC pulsed\n");
735 }
736 }
737
738 /* XXX: may change if moved to bdrv */
739 int fdctrl_get_drive_type(fdctrl_t *fdctrl, int drive_num)
740 {
741 return fdctrl->drives[drive_num].drive;
742 }
743
744 /* Change IRQ state */
745 static void fdctrl_reset_irq (fdctrl_t *fdctrl)
746 {
747 if (!(fdctrl->sra & FD_SRA_INTPEND))
748 return;
749 FLOPPY_DPRINTF("Reset interrupt\n");
750 qemu_set_irq(fdctrl->irq, 0);
751 fdctrl->sra &= ~FD_SRA_INTPEND;
752 }
753
754 static void fdctrl_raise_irq (fdctrl_t *fdctrl, uint8_t status0)
755 {
756 /* Sparc mutation */
757 if (fdctrl->sun4m && (fdctrl->msr & FD_MSR_CMDBUSY)) {
758 /* XXX: not sure */
759 fdctrl->msr &= ~FD_MSR_CMDBUSY;
760 fdctrl->msr |= FD_MSR_RQM | FD_MSR_DIO;
761 fdctrl->status0 = status0;
762 return;
763 }
764 if (!(fdctrl->sra & FD_SRA_INTPEND)) {
765 qemu_set_irq(fdctrl->irq, 1);
766 fdctrl->sra |= FD_SRA_INTPEND;
767 }
768 fdctrl->reset_sensei = 0;
769 fdctrl->status0 = status0;
770 FLOPPY_DPRINTF("Set interrupt status to 0x%02x\n", fdctrl->status0);
771 }
772
773 /* Reset controller */
774 static void fdctrl_reset (fdctrl_t *fdctrl, int do_irq)
775 {
776 int i;
777
778 FLOPPY_DPRINTF("reset controller\n");
779 fdctrl_reset_irq(fdctrl);
780 /* Initialise controller */
781 fdctrl->sra = 0;
782 fdctrl->srb = 0xc0;
783 if (!fdctrl->drives[1].bs)
784 fdctrl->sra |= FD_SRA_nDRV2;
785 fdctrl->cur_drv = 0;
786 fdctrl->dor = FD_DOR_nRESET;
787 fdctrl->dor |= (fdctrl->dma_chann != -1) ? FD_DOR_DMAEN : 0;
788 fdctrl->msr = FD_MSR_RQM;
789 /* FIFO state */
790 fdctrl->data_pos = 0;
791 fdctrl->data_len = 0;
792 fdctrl->data_state = 0;
793 fdctrl->data_dir = FD_DIR_WRITE;
794 for (i = 0; i < MAX_FD; i++)
795 fd_recalibrate(&fdctrl->drives[i]);
796 fdctrl_reset_fifo(fdctrl);
797 if (do_irq) {
798 fdctrl_raise_irq(fdctrl, FD_SR0_RDYCHG);
799 fdctrl->reset_sensei = FD_RESET_SENSEI_COUNT;
800 }
801 }
802
803 static inline fdrive_t *drv0 (fdctrl_t *fdctrl)
804 {
805 return &fdctrl->drives[(fdctrl->tdr & FD_TDR_BOOTSEL) >> 2];
806 }
807
808 static inline fdrive_t *drv1 (fdctrl_t *fdctrl)
809 {
810 if ((fdctrl->tdr & FD_TDR_BOOTSEL) < (1 << 2))
811 return &fdctrl->drives[1];
812 else
813 return &fdctrl->drives[0];
814 }
815
816 #if MAX_FD == 4
817 static inline fdrive_t *drv2 (fdctrl_t *fdctrl)
818 {
819 if ((fdctrl->tdr & FD_TDR_BOOTSEL) < (2 << 2))
820 return &fdctrl->drives[2];
821 else
822 return &fdctrl->drives[1];
823 }
824
825 static inline fdrive_t *drv3 (fdctrl_t *fdctrl)
826 {
827 if ((fdctrl->tdr & FD_TDR_BOOTSEL) < (3 << 2))
828 return &fdctrl->drives[3];
829 else
830 return &fdctrl->drives[2];
831 }
832 #endif
833
834 static fdrive_t *get_cur_drv (fdctrl_t *fdctrl)
835 {
836 switch (fdctrl->cur_drv) {
837 case 0: return drv0(fdctrl);
838 case 1: return drv1(fdctrl);
839 #if MAX_FD == 4
840 case 2: return drv2(fdctrl);
841 case 3: return drv3(fdctrl);
842 #endif
843 default: return NULL;
844 }
845 }
846
847 /* Status A register : 0x00 (read-only) */
848 static uint32_t fdctrl_read_statusA (fdctrl_t *fdctrl)
849 {
850 uint32_t retval = fdctrl->sra;
851
852 FLOPPY_DPRINTF("status register A: 0x%02x\n", retval);
853
854 return retval;
855 }
856
857 /* Status B register : 0x01 (read-only) */
858 static uint32_t fdctrl_read_statusB (fdctrl_t *fdctrl)
859 {
860 uint32_t retval = fdctrl->srb;
861
862 FLOPPY_DPRINTF("status register B: 0x%02x\n", retval);
863
864 return retval;
865 }
866
867 /* Digital output register : 0x02 */
868 static uint32_t fdctrl_read_dor (fdctrl_t *fdctrl)
869 {
870 uint32_t retval = fdctrl->dor;
871
872 /* Selected drive */
873 retval |= fdctrl->cur_drv;
874 FLOPPY_DPRINTF("digital output register: 0x%02x\n", retval);
875
876 return retval;
877 }
878
879 static void fdctrl_write_dor (fdctrl_t *fdctrl, uint32_t value)
880 {
881 FLOPPY_DPRINTF("digital output register set to 0x%02x\n", value);
882
883 /* Motors */
884 if (value & FD_DOR_MOTEN0)
885 fdctrl->srb |= FD_SRB_MTR0;
886 else
887 fdctrl->srb &= ~FD_SRB_MTR0;
888 if (value & FD_DOR_MOTEN1)
889 fdctrl->srb |= FD_SRB_MTR1;
890 else
891 fdctrl->srb &= ~FD_SRB_MTR1;
892
893 /* Drive */
894 if (value & 1)
895 fdctrl->srb |= FD_SRB_DR0;
896 else
897 fdctrl->srb &= ~FD_SRB_DR0;
898
899 /* Reset */
900 if (!(value & FD_DOR_nRESET)) {
901 if (fdctrl->dor & FD_DOR_nRESET) {
902 FLOPPY_DPRINTF("controller enter RESET state\n");
903 }
904 } else {
905 if (!(fdctrl->dor & FD_DOR_nRESET)) {
906 FLOPPY_DPRINTF("controller out of RESET state\n");
907 fdctrl_reset(fdctrl, 1);
908 fdctrl->dsr &= ~FD_DSR_PWRDOWN;
909 }
910 }
911 /* Selected drive */
912 fdctrl->cur_drv = value & FD_DOR_SELMASK;
913
914 fdctrl->dor = value;
915 }
916
917 /* Tape drive register : 0x03 */
918 static uint32_t fdctrl_read_tape (fdctrl_t *fdctrl)
919 {
920 uint32_t retval = fdctrl->tdr;
921
922 FLOPPY_DPRINTF("tape drive register: 0x%02x\n", retval);
923
924 return retval;
925 }
926
927 static void fdctrl_write_tape (fdctrl_t *fdctrl, uint32_t value)
928 {
929 /* Reset mode */
930 if (!(fdctrl->dor & FD_DOR_nRESET)) {
931 FLOPPY_DPRINTF("Floppy controller in RESET state !\n");
932 return;
933 }
934 FLOPPY_DPRINTF("tape drive register set to 0x%02x\n", value);
935 /* Disk boot selection indicator */
936 fdctrl->tdr = value & FD_TDR_BOOTSEL;
937 /* Tape indicators: never allow */
938 }
939
940 /* Main status register : 0x04 (read) */
941 static uint32_t fdctrl_read_main_status (fdctrl_t *fdctrl)
942 {
943 uint32_t retval = fdctrl->msr;
944
945 fdctrl->dsr &= ~FD_DSR_PWRDOWN;
946 fdctrl->dor |= FD_DOR_nRESET;
947
948 FLOPPY_DPRINTF("main status register: 0x%02x\n", retval);
949
950 return retval;
951 }
952
953 /* Data select rate register : 0x04 (write) */
954 static void fdctrl_write_rate (fdctrl_t *fdctrl, uint32_t value)
955 {
956 /* Reset mode */
957 if (!(fdctrl->dor & FD_DOR_nRESET)) {
958 FLOPPY_DPRINTF("Floppy controller in RESET state !\n");
959 return;
960 }
961 FLOPPY_DPRINTF("select rate register set to 0x%02x\n", value);
962 /* Reset: autoclear */
963 if (value & FD_DSR_SWRESET) {
964 fdctrl->dor &= ~FD_DOR_nRESET;
965 fdctrl_reset(fdctrl, 1);
966 fdctrl->dor |= FD_DOR_nRESET;
967 }
968 if (value & FD_DSR_PWRDOWN) {
969 fdctrl_reset(fdctrl, 1);
970 }
971 fdctrl->dsr = value;
972 }
973
974 static int fdctrl_media_changed(fdrive_t *drv)
975 {
976 int ret;
977
978 if (!drv->bs)
979 return 0;
980 ret = bdrv_media_changed(drv->bs);
981 if (ret) {
982 fd_revalidate(drv);
983 }
984 return ret;
985 }
986
987 /* Digital input register : 0x07 (read-only) */
988 static uint32_t fdctrl_read_dir (fdctrl_t *fdctrl)
989 {
990 uint32_t retval = 0;
991
992 if (fdctrl_media_changed(drv0(fdctrl))
993 || fdctrl_media_changed(drv1(fdctrl))
994 #if MAX_FD == 4
995 || fdctrl_media_changed(drv2(fdctrl))
996 || fdctrl_media_changed(drv3(fdctrl))
997 #endif
998 )
999 retval |= FD_DIR_DSKCHG;
1000 if (retval != 0)
1001 FLOPPY_DPRINTF("Floppy digital input register: 0x%02x\n", retval);
1002
1003 return retval;
1004 }
1005
1006 /* FIFO state control */
1007 static void fdctrl_reset_fifo (fdctrl_t *fdctrl)
1008 {
1009 fdctrl->data_dir = FD_DIR_WRITE;
1010 fdctrl->data_pos = 0;
1011 fdctrl->msr &= ~(FD_MSR_CMDBUSY | FD_MSR_DIO);
1012 }
1013
1014 /* Set FIFO status for the host to read */
1015 static void fdctrl_set_fifo (fdctrl_t *fdctrl, int fifo_len, int do_irq)
1016 {
1017 fdctrl->data_dir = FD_DIR_READ;
1018 fdctrl->data_len = fifo_len;
1019 fdctrl->data_pos = 0;
1020 fdctrl->msr |= FD_MSR_CMDBUSY | FD_MSR_RQM | FD_MSR_DIO;
1021 if (do_irq)
1022 fdctrl_raise_irq(fdctrl, 0x00);
1023 }
1024
1025 /* Set an error: unimplemented/unknown command */
1026 static void fdctrl_unimplemented (fdctrl_t *fdctrl, int direction)
1027 {
1028 FLOPPY_ERROR("unimplemented command 0x%02x\n", fdctrl->fifo[0]);
1029 fdctrl->fifo[0] = FD_SR0_INVCMD;
1030 fdctrl_set_fifo(fdctrl, 1, 0);
1031 }
1032
1033 /* Seek to next sector */
1034 static int fdctrl_seek_to_next_sect (fdctrl_t *fdctrl, fdrive_t *cur_drv)
1035 {
1036 FLOPPY_DPRINTF("seek to next sector (%d %02x %02x => %d)\n",
1037 cur_drv->head, cur_drv->track, cur_drv->sect,
1038 fd_sector(cur_drv));
1039 /* XXX: cur_drv->sect >= cur_drv->last_sect should be an
1040 error in fact */
1041 if (cur_drv->sect >= cur_drv->last_sect ||
1042 cur_drv->sect == fdctrl->eot) {
1043 cur_drv->sect = 1;
1044 if (FD_MULTI_TRACK(fdctrl->data_state)) {
1045 if (cur_drv->head == 0 &&
1046 (cur_drv->flags & FDISK_DBL_SIDES) != 0) {
1047 cur_drv->head = 1;
1048 } else {
1049 cur_drv->head = 0;
1050 cur_drv->track++;
1051 if ((cur_drv->flags & FDISK_DBL_SIDES) == 0)
1052 return 0;
1053 }
1054 } else {
1055 cur_drv->track++;
1056 return 0;
1057 }
1058 FLOPPY_DPRINTF("seek to next track (%d %02x %02x => %d)\n",
1059 cur_drv->head, cur_drv->track,
1060 cur_drv->sect, fd_sector(cur_drv));
1061 } else {
1062 cur_drv->sect++;
1063 }
1064 return 1;
1065 }
1066
1067 /* Callback for transfer end (stop or abort) */
1068 static void fdctrl_stop_transfer (fdctrl_t *fdctrl, uint8_t status0,
1069 uint8_t status1, uint8_t status2)
1070 {
1071 fdrive_t *cur_drv;
1072
1073 cur_drv = get_cur_drv(fdctrl);
1074 FLOPPY_DPRINTF("transfer status: %02x %02x %02x (%02x)\n",
1075 status0, status1, status2,
1076 status0 | (cur_drv->head << 2) | GET_CUR_DRV(fdctrl));
1077 fdctrl->fifo[0] = status0 | (cur_drv->head << 2) | GET_CUR_DRV(fdctrl);
1078 fdctrl->fifo[1] = status1;
1079 fdctrl->fifo[2] = status2;
1080 fdctrl->fifo[3] = cur_drv->track;
1081 fdctrl->fifo[4] = cur_drv->head;
1082 fdctrl->fifo[5] = cur_drv->sect;
1083 fdctrl->fifo[6] = FD_SECTOR_SC;
1084 fdctrl->data_dir = FD_DIR_READ;
1085 if (!(fdctrl->msr & FD_MSR_NONDMA)) {
1086 DMA_release_DREQ(fdctrl->dma_chann);
1087 }
1088 fdctrl->msr |= FD_MSR_RQM | FD_MSR_DIO;
1089 fdctrl->msr &= ~FD_MSR_NONDMA;
1090 fdctrl_set_fifo(fdctrl, 7, 1);
1091 }
1092
1093 /* Prepare a data transfer (either DMA or FIFO) */
1094 static void fdctrl_start_transfer (fdctrl_t *fdctrl, int direction)
1095 {
1096 fdrive_t *cur_drv;
1097 uint8_t kh, kt, ks;
1098 int did_seek = 0;
1099
1100 SET_CUR_DRV(fdctrl, fdctrl->fifo[1] & FD_DOR_SELMASK);
1101 cur_drv = get_cur_drv(fdctrl);
1102 kt = fdctrl->fifo[2];
1103 kh = fdctrl->fifo[3];
1104 ks = fdctrl->fifo[4];
1105 FLOPPY_DPRINTF("Start transfer at %d %d %02x %02x (%d)\n",
1106 GET_CUR_DRV(fdctrl), kh, kt, ks,
1107 _fd_sector(kh, kt, ks, cur_drv->last_sect));
1108 switch (fd_seek(cur_drv, kh, kt, ks, fdctrl->config & FD_CONFIG_EIS)) {
1109 case 2:
1110 /* sect too big */
1111 fdctrl_stop_transfer(fdctrl, FD_SR0_ABNTERM, 0x00, 0x00);
1112 fdctrl->fifo[3] = kt;
1113 fdctrl->fifo[4] = kh;
1114 fdctrl->fifo[5] = ks;
1115 return;
1116 case 3:
1117 /* track too big */
1118 fdctrl_stop_transfer(fdctrl, FD_SR0_ABNTERM, FD_SR1_EC, 0x00);
1119 fdctrl->fifo[3] = kt;
1120 fdctrl->fifo[4] = kh;
1121 fdctrl->fifo[5] = ks;
1122 return;
1123 case 4:
1124 /* No seek enabled */
1125 fdctrl_stop_transfer(fdctrl, FD_SR0_ABNTERM, 0x00, 0x00);
1126 fdctrl->fifo[3] = kt;
1127 fdctrl->fifo[4] = kh;
1128 fdctrl->fifo[5] = ks;
1129 return;
1130 case 1:
1131 did_seek = 1;
1132 break;
1133 default:
1134 break;
1135 }
1136
1137 /* Set the FIFO state */
1138 fdctrl->data_dir = direction;
1139 fdctrl->data_pos = 0;
1140 fdctrl->msr |= FD_MSR_CMDBUSY;
1141 if (fdctrl->fifo[0] & 0x80)
1142 fdctrl->data_state |= FD_STATE_MULTI;
1143 else
1144 fdctrl->data_state &= ~FD_STATE_MULTI;
1145 if (did_seek)
1146 fdctrl->data_state |= FD_STATE_SEEK;
1147 else
1148 fdctrl->data_state &= ~FD_STATE_SEEK;
1149 if (fdctrl->fifo[5] == 00) {
1150 fdctrl->data_len = fdctrl->fifo[8];
1151 } else {
1152 int tmp;
1153 fdctrl->data_len = 128 << (fdctrl->fifo[5] > 7 ? 7 : fdctrl->fifo[5]);
1154 tmp = (fdctrl->fifo[6] - ks + 1);
1155 if (fdctrl->fifo[0] & 0x80)
1156 tmp += fdctrl->fifo[6];
1157 fdctrl->data_len *= tmp;
1158 }
1159 fdctrl->eot = fdctrl->fifo[6];
1160 if (fdctrl->dor & FD_DOR_DMAEN) {
1161 int dma_mode;
1162 /* DMA transfer are enabled. Check if DMA channel is well programmed */
1163 dma_mode = DMA_get_channel_mode(fdctrl->dma_chann);
1164 dma_mode = (dma_mode >> 2) & 3;
1165 FLOPPY_DPRINTF("dma_mode=%d direction=%d (%d - %d)\n",
1166 dma_mode, direction,
1167 (128 << fdctrl->fifo[5]) *
1168 (cur_drv->last_sect - ks + 1), fdctrl->data_len);
1169 if (((direction == FD_DIR_SCANE || direction == FD_DIR_SCANL ||
1170 direction == FD_DIR_SCANH) && dma_mode == 0) ||
1171 (direction == FD_DIR_WRITE && dma_mode == 2) ||
1172 (direction == FD_DIR_READ && dma_mode == 1)) {
1173 /* No access is allowed until DMA transfer has completed */
1174 fdctrl->msr &= ~FD_MSR_RQM;
1175 /* Now, we just have to wait for the DMA controller to
1176 * recall us...
1177 */
1178 DMA_hold_DREQ(fdctrl->dma_chann);
1179 DMA_schedule(fdctrl->dma_chann);
1180 return;
1181 } else {
1182 FLOPPY_ERROR("dma_mode=%d direction=%d\n", dma_mode, direction);
1183 }
1184 }
1185 FLOPPY_DPRINTF("start non-DMA transfer\n");
1186 fdctrl->msr |= FD_MSR_NONDMA;
1187 if (direction != FD_DIR_WRITE)
1188 fdctrl->msr |= FD_MSR_DIO;
1189 /* IO based transfer: calculate len */
1190 fdctrl_raise_irq(fdctrl, 0x00);
1191
1192 return;
1193 }
1194
1195 /* Prepare a transfer of deleted data */
1196 static void fdctrl_start_transfer_del (fdctrl_t *fdctrl, int direction)
1197 {
1198 FLOPPY_ERROR("fdctrl_start_transfer_del() unimplemented\n");
1199
1200 /* We don't handle deleted data,
1201 * so we don't return *ANYTHING*
1202 */
1203 fdctrl_stop_transfer(fdctrl, FD_SR0_ABNTERM | FD_SR0_SEEK, 0x00, 0x00);
1204 }
1205
1206 /* handlers for DMA transfers */
1207 static int fdctrl_transfer_handler (void *opaque, int nchan,
1208 int dma_pos, int dma_len)
1209 {
1210 fdctrl_t *fdctrl;
1211 fdrive_t *cur_drv;
1212 int len, start_pos, rel_pos;
1213 uint8_t status0 = 0x00, status1 = 0x00, status2 = 0x00;
1214
1215 fdctrl = opaque;
1216 if (fdctrl->msr & FD_MSR_RQM) {
1217 FLOPPY_DPRINTF("Not in DMA transfer mode !\n");
1218 return 0;
1219 }
1220 cur_drv = get_cur_drv(fdctrl);
1221 if (fdctrl->data_dir == FD_DIR_SCANE || fdctrl->data_dir == FD_DIR_SCANL ||
1222 fdctrl->data_dir == FD_DIR_SCANH)
1223 status2 = FD_SR2_SNS;
1224 if (dma_len > fdctrl->data_len)
1225 dma_len = fdctrl->data_len;
1226 if (cur_drv->bs == NULL) {
1227 if (fdctrl->data_dir == FD_DIR_WRITE)
1228 fdctrl_stop_transfer(fdctrl, FD_SR0_ABNTERM | FD_SR0_SEEK, 0x00, 0x00);
1229 else
1230 fdctrl_stop_transfer(fdctrl, FD_SR0_ABNTERM, 0x00, 0x00);
1231 len = 0;
1232 goto transfer_error;
1233 }
1234 rel_pos = fdctrl->data_pos % FD_SECTOR_LEN;
1235 for (start_pos = fdctrl->data_pos; fdctrl->data_pos < dma_len;) {
1236 len = dma_len - fdctrl->data_pos;
1237 if (len + rel_pos > FD_SECTOR_LEN)
1238 len = FD_SECTOR_LEN - rel_pos;
1239 FLOPPY_DPRINTF("copy %d bytes (%d %d %d) %d pos %d %02x "
1240 "(%d-0x%08x 0x%08x)\n", len, dma_len, fdctrl->data_pos,
1241 fdctrl->data_len, GET_CUR_DRV(fdctrl), cur_drv->head,
1242 cur_drv->track, cur_drv->sect, fd_sector(cur_drv),
1243 fd_sector(cur_drv) * FD_SECTOR_LEN);
1244 if (fdctrl->data_dir != FD_DIR_WRITE ||
1245 len < FD_SECTOR_LEN || rel_pos != 0) {
1246 /* READ & SCAN commands and realign to a sector for WRITE */
1247 if (bdrv_read(cur_drv->bs, fd_sector(cur_drv),
1248 fdctrl->fifo, 1) < 0) {
1249 FLOPPY_DPRINTF("Floppy: error getting sector %d\n",
1250 fd_sector(cur_drv));
1251 /* Sure, image size is too small... */
1252 memset(fdctrl->fifo, 0, FD_SECTOR_LEN);
1253 }
1254 }
1255 switch (fdctrl->data_dir) {
1256 case FD_DIR_READ:
1257 /* READ commands */
1258 DMA_write_memory (nchan, fdctrl->fifo + rel_pos,
1259 fdctrl->data_pos, len);
1260 break;
1261 case FD_DIR_WRITE:
1262 /* WRITE commands */
1263 DMA_read_memory (nchan, fdctrl->fifo + rel_pos,
1264 fdctrl->data_pos, len);
1265 if (bdrv_write(cur_drv->bs, fd_sector(cur_drv),
1266 fdctrl->fifo, 1) < 0) {
1267 FLOPPY_ERROR("writing sector %d\n", fd_sector(cur_drv));
1268 fdctrl_stop_transfer(fdctrl, FD_SR0_ABNTERM | FD_SR0_SEEK, 0x00, 0x00);
1269 goto transfer_error;
1270 }
1271 break;
1272 default:
1273 /* SCAN commands */
1274 {
1275 uint8_t tmpbuf[FD_SECTOR_LEN];
1276 int ret;
1277 DMA_read_memory (nchan, tmpbuf, fdctrl->data_pos, len);
1278 ret = memcmp(tmpbuf, fdctrl->fifo + rel_pos, len);
1279 if (ret == 0) {
1280 status2 = FD_SR2_SEH;
1281 goto end_transfer;
1282 }
1283 if ((ret < 0 && fdctrl->data_dir == FD_DIR_SCANL) ||
1284 (ret > 0 && fdctrl->data_dir == FD_DIR_SCANH)) {
1285 status2 = 0x00;
1286 goto end_transfer;
1287 }
1288 }
1289 break;
1290 }
1291 fdctrl->data_pos += len;
1292 rel_pos = fdctrl->data_pos % FD_SECTOR_LEN;
1293 if (rel_pos == 0) {
1294 /* Seek to next sector */
1295 if (!fdctrl_seek_to_next_sect(fdctrl, cur_drv))
1296 break;
1297 }
1298 }
1299 end_transfer:
1300 len = fdctrl->data_pos - start_pos;
1301 FLOPPY_DPRINTF("end transfer %d %d %d\n",
1302 fdctrl->data_pos, len, fdctrl->data_len);
1303 if (fdctrl->data_dir == FD_DIR_SCANE ||
1304 fdctrl->data_dir == FD_DIR_SCANL ||
1305 fdctrl->data_dir == FD_DIR_SCANH)
1306 status2 = FD_SR2_SEH;
1307 if (FD_DID_SEEK(fdctrl->data_state))
1308 status0 |= FD_SR0_SEEK;
1309 fdctrl->data_len -= len;
1310 fdctrl_stop_transfer(fdctrl, status0, status1, status2);
1311 transfer_error:
1312
1313 return len;
1314 }
1315
1316 /* Data register : 0x05 */
1317 static uint32_t fdctrl_read_data (fdctrl_t *fdctrl)
1318 {
1319 fdrive_t *cur_drv;
1320 uint32_t retval = 0;
1321 int pos;
1322
1323 cur_drv = get_cur_drv(fdctrl);
1324 fdctrl->dsr &= ~FD_DSR_PWRDOWN;
1325 if (!(fdctrl->msr & FD_MSR_RQM) || !(fdctrl->msr & FD_MSR_DIO)) {
1326 FLOPPY_ERROR("controller not ready for reading\n");
1327 return 0;
1328 }
1329 pos = fdctrl->data_pos;
1330 if (fdctrl->msr & FD_MSR_NONDMA) {
1331 pos %= FD_SECTOR_LEN;
1332 if (pos == 0) {
1333 if (fdctrl->data_pos != 0)
1334 if (!fdctrl_seek_to_next_sect(fdctrl, cur_drv)) {
1335 FLOPPY_DPRINTF("error seeking to next sector %d\n",
1336 fd_sector(cur_drv));
1337 return 0;
1338 }
1339 if (bdrv_read(cur_drv->bs, fd_sector(cur_drv), fdctrl->fifo, 1) < 0) {
1340 FLOPPY_DPRINTF("error getting sector %d\n",
1341 fd_sector(cur_drv));
1342 /* Sure, image size is too small... */
1343 memset(fdctrl->fifo, 0, FD_SECTOR_LEN);
1344 }
1345 }
1346 }
1347 retval = fdctrl->fifo[pos];
1348 if (++fdctrl->data_pos == fdctrl->data_len) {
1349 fdctrl->data_pos = 0;
1350 /* Switch from transfer mode to status mode
1351 * then from status mode to command mode
1352 */
1353 if (fdctrl->msr & FD_MSR_NONDMA) {
1354 fdctrl_stop_transfer(fdctrl, FD_SR0_SEEK, 0x00, 0x00);
1355 } else {
1356 fdctrl_reset_fifo(fdctrl);
1357 fdctrl_reset_irq(fdctrl);
1358 }
1359 }
1360 FLOPPY_DPRINTF("data register: 0x%02x\n", retval);
1361
1362 return retval;
1363 }
1364
1365 static void fdctrl_format_sector (fdctrl_t *fdctrl)
1366 {
1367 fdrive_t *cur_drv;
1368 uint8_t kh, kt, ks;
1369
1370 SET_CUR_DRV(fdctrl, fdctrl->fifo[1] & FD_DOR_SELMASK);
1371 cur_drv = get_cur_drv(fdctrl);
1372 kt = fdctrl->fifo[6];
1373 kh = fdctrl->fifo[7];
1374 ks = fdctrl->fifo[8];
1375 FLOPPY_DPRINTF("format sector at %d %d %02x %02x (%d)\n",
1376 GET_CUR_DRV(fdctrl), kh, kt, ks,
1377 _fd_sector(kh, kt, ks, cur_drv->last_sect));
1378 switch (fd_seek(cur_drv, kh, kt, ks, fdctrl->config & FD_CONFIG_EIS)) {
1379 case 2:
1380 /* sect too big */
1381 fdctrl_stop_transfer(fdctrl, FD_SR0_ABNTERM, 0x00, 0x00);
1382 fdctrl->fifo[3] = kt;
1383 fdctrl->fifo[4] = kh;
1384 fdctrl->fifo[5] = ks;
1385 return;
1386 case 3:
1387 /* track too big */
1388 fdctrl_stop_transfer(fdctrl, FD_SR0_ABNTERM, FD_SR1_EC, 0x00);
1389 fdctrl->fifo[3] = kt;
1390 fdctrl->fifo[4] = kh;
1391 fdctrl->fifo[5] = ks;
1392 return;
1393 case 4:
1394 /* No seek enabled */
1395 fdctrl_stop_transfer(fdctrl, FD_SR0_ABNTERM, 0x00, 0x00);
1396 fdctrl->fifo[3] = kt;
1397 fdctrl->fifo[4] = kh;
1398 fdctrl->fifo[5] = ks;
1399 return;
1400 case 1:
1401 fdctrl->data_state |= FD_STATE_SEEK;
1402 break;
1403 default:
1404 break;
1405 }
1406 memset(fdctrl->fifo, 0, FD_SECTOR_LEN);
1407 if (cur_drv->bs == NULL ||
1408 bdrv_write(cur_drv->bs, fd_sector(cur_drv), fdctrl->fifo, 1) < 0) {
1409 FLOPPY_ERROR("formatting sector %d\n", fd_sector(cur_drv));
1410 fdctrl_stop_transfer(fdctrl, FD_SR0_ABNTERM | FD_SR0_SEEK, 0x00, 0x00);
1411 } else {
1412 if (cur_drv->sect == cur_drv->last_sect) {
1413 fdctrl->data_state &= ~FD_STATE_FORMAT;
1414 /* Last sector done */
1415 if (FD_DID_SEEK(fdctrl->data_state))
1416 fdctrl_stop_transfer(fdctrl, FD_SR0_SEEK, 0x00, 0x00);
1417 else
1418 fdctrl_stop_transfer(fdctrl, 0x00, 0x00, 0x00);
1419 } else {
1420 /* More to do */
1421 fdctrl->data_pos = 0;
1422 fdctrl->data_len = 4;
1423 }
1424 }
1425 }
1426
1427 static void fdctrl_handle_lock (fdctrl_t *fdctrl, int direction)
1428 {
1429 fdctrl->lock = (fdctrl->fifo[0] & 0x80) ? 1 : 0;
1430 fdctrl->fifo[0] = fdctrl->lock << 4;
1431 fdctrl_set_fifo(fdctrl, 1, fdctrl->lock);
1432 }
1433
1434 static void fdctrl_handle_dumpreg (fdctrl_t *fdctrl, int direction)
1435 {
1436 fdrive_t *cur_drv = get_cur_drv(fdctrl);
1437
1438 /* Drives position */
1439 fdctrl->fifo[0] = drv0(fdctrl)->track;
1440 fdctrl->fifo[1] = drv1(fdctrl)->track;
1441 #if MAX_FD == 4
1442 fdctrl->fifo[2] = drv2(fdctrl)->track;
1443 fdctrl->fifo[3] = drv3(fdctrl)->track;
1444 #else
1445 fdctrl->fifo[2] = 0;
1446 fdctrl->fifo[3] = 0;
1447 #endif
1448 /* timers */
1449 fdctrl->fifo[4] = fdctrl->timer0;
1450 fdctrl->fifo[5] = (fdctrl->timer1 << 1) | (fdctrl->dor & FD_DOR_DMAEN ? 1 : 0);
1451 fdctrl->fifo[6] = cur_drv->last_sect;
1452 fdctrl->fifo[7] = (fdctrl->lock << 7) |
1453 (cur_drv->perpendicular << 2);
1454 fdctrl->fifo[8] = fdctrl->config;
1455 fdctrl->fifo[9] = fdctrl->precomp_trk;
1456 fdctrl_set_fifo(fdctrl, 10, 0);
1457 }
1458
1459 static void fdctrl_handle_version (fdctrl_t *fdctrl, int direction)
1460 {
1461 /* Controller's version */
1462 fdctrl->fifo[0] = fdctrl->version;
1463 fdctrl_set_fifo(fdctrl, 1, 1);
1464 }
1465
1466 static void fdctrl_handle_partid (fdctrl_t *fdctrl, int direction)
1467 {
1468 fdctrl->fifo[0] = 0x41; /* Stepping 1 */
1469 fdctrl_set_fifo(fdctrl, 1, 0);
1470 }
1471
1472 static void fdctrl_handle_restore (fdctrl_t *fdctrl, int direction)
1473 {
1474 fdrive_t *cur_drv = get_cur_drv(fdctrl);
1475
1476 /* Drives position */
1477 drv0(fdctrl)->track = fdctrl->fifo[3];
1478 drv1(fdctrl)->track = fdctrl->fifo[4];
1479 #if MAX_FD == 4
1480 drv2(fdctrl)->track = fdctrl->fifo[5];
1481 drv3(fdctrl)->track = fdctrl->fifo[6];
1482 #endif
1483 /* timers */
1484 fdctrl->timer0 = fdctrl->fifo[7];
1485 fdctrl->timer1 = fdctrl->fifo[8];
1486 cur_drv->last_sect = fdctrl->fifo[9];
1487 fdctrl->lock = fdctrl->fifo[10] >> 7;
1488 cur_drv->perpendicular = (fdctrl->fifo[10] >> 2) & 0xF;
1489 fdctrl->config = fdctrl->fifo[11];
1490 fdctrl->precomp_trk = fdctrl->fifo[12];
1491 fdctrl->pwrd = fdctrl->fifo[13];
1492 fdctrl_reset_fifo(fdctrl);
1493 }
1494
1495 static void fdctrl_handle_save (fdctrl_t *fdctrl, int direction)
1496 {
1497 fdrive_t *cur_drv = get_cur_drv(fdctrl);
1498
1499 fdctrl->fifo[0] = 0;
1500 fdctrl->fifo[1] = 0;
1501 /* Drives position */
1502 fdctrl->fifo[2] = drv0(fdctrl)->track;
1503 fdctrl->fifo[3] = drv1(fdctrl)->track;
1504 #if MAX_FD == 4
1505 fdctrl->fifo[4] = drv2(fdctrl)->track;
1506 fdctrl->fifo[5] = drv3(fdctrl)->track;
1507 #else
1508 fdctrl->fifo[4] = 0;
1509 fdctrl->fifo[5] = 0;
1510 #endif
1511 /* timers */
1512 fdctrl->fifo[6] = fdctrl->timer0;
1513 fdctrl->fifo[7] = fdctrl->timer1;
1514 fdctrl->fifo[8] = cur_drv->last_sect;
1515 fdctrl->fifo[9] = (fdctrl->lock << 7) |
1516 (cur_drv->perpendicular << 2);
1517 fdctrl->fifo[10] = fdctrl->config;
1518 fdctrl->fifo[11] = fdctrl->precomp_trk;
1519 fdctrl->fifo[12] = fdctrl->pwrd;
1520 fdctrl->fifo[13] = 0;
1521 fdctrl->fifo[14] = 0;
1522 fdctrl_set_fifo(fdctrl, 15, 1);
1523 }
1524
1525 static void fdctrl_handle_readid (fdctrl_t *fdctrl, int direction)
1526 {
1527 fdrive_t *cur_drv = get_cur_drv(fdctrl);
1528
1529 /* XXX: should set main status register to busy */
1530 cur_drv->head = (fdctrl->fifo[1] >> 2) & 1;
1531 qemu_mod_timer(fdctrl->result_timer,
1532 qemu_get_clock(vm_clock) + (ticks_per_sec / 50));
1533 }
1534
1535 static void fdctrl_handle_format_track (fdctrl_t *fdctrl, int direction)
1536 {
1537 fdrive_t *cur_drv;
1538
1539 SET_CUR_DRV(fdctrl, fdctrl->fifo[1] & FD_DOR_SELMASK);
1540 cur_drv = get_cur_drv(fdctrl);
1541 fdctrl->data_state |= FD_STATE_FORMAT;
1542 if (fdctrl->fifo[0] & 0x80)
1543 fdctrl->data_state |= FD_STATE_MULTI;
1544 else
1545 fdctrl->data_state &= ~FD_STATE_MULTI;
1546 fdctrl->data_state &= ~FD_STATE_SEEK;
1547 cur_drv->bps =
1548 fdctrl->fifo[2] > 7 ? 16384 : 128 << fdctrl->fifo[2];
1549 #if 0
1550 cur_drv->last_sect =
1551 cur_drv->flags & FDISK_DBL_SIDES ? fdctrl->fifo[3] :
1552 fdctrl->fifo[3] / 2;
1553 #else
1554 cur_drv->last_sect = fdctrl->fifo[3];
1555 #endif
1556 /* TODO: implement format using DMA expected by the Bochs BIOS
1557 * and Linux fdformat (read 3 bytes per sector via DMA and fill
1558 * the sector with the specified fill byte
1559 */
1560 fdctrl->data_state &= ~FD_STATE_FORMAT;
1561 fdctrl_stop_transfer(fdctrl, 0x00, 0x00, 0x00);
1562 }
1563
1564 static void fdctrl_handle_specify (fdctrl_t *fdctrl, int direction)
1565 {
1566 fdctrl->timer0 = (fdctrl->fifo[1] >> 4) & 0xF;
1567 fdctrl->timer1 = fdctrl->fifo[2] >> 1;
1568 if (fdctrl->fifo[2] & 1)
1569 fdctrl->dor &= ~FD_DOR_DMAEN;
1570 else
1571 fdctrl->dor |= FD_DOR_DMAEN;
1572 /* No result back */
1573 fdctrl_reset_fifo(fdctrl);
1574 }
1575
1576 static void fdctrl_handle_sense_drive_status (fdctrl_t *fdctrl, int direction)
1577 {
1578 fdrive_t *cur_drv;
1579
1580 SET_CUR_DRV(fdctrl, fdctrl->fifo[1] & FD_DOR_SELMASK);
1581 cur_drv = get_cur_drv(fdctrl);
1582 cur_drv->head = (fdctrl->fifo[1] >> 2) & 1;
1583 /* 1 Byte status back */
1584 fdctrl->fifo[0] = (cur_drv->ro << 6) |
1585 (cur_drv->track == 0 ? 0x10 : 0x00) |
1586 (cur_drv->head << 2) |
1587 GET_CUR_DRV(fdctrl) |
1588 0x28;
1589 fdctrl_set_fifo(fdctrl, 1, 0);
1590 }
1591
1592 static void fdctrl_handle_recalibrate (fdctrl_t *fdctrl, int direction)
1593 {
1594 fdrive_t *cur_drv;
1595
1596 SET_CUR_DRV(fdctrl, fdctrl->fifo[1] & FD_DOR_SELMASK);
1597 cur_drv = get_cur_drv(fdctrl);
1598 fd_recalibrate(cur_drv);
1599 fdctrl_reset_fifo(fdctrl);
1600 /* Raise Interrupt */
1601 fdctrl_raise_irq(fdctrl, FD_SR0_SEEK);
1602 }
1603
1604 static void fdctrl_handle_sense_interrupt_status (fdctrl_t *fdctrl, int direction)
1605 {
1606 fdrive_t *cur_drv = get_cur_drv(fdctrl);
1607
1608 if(fdctrl->reset_sensei > 0) {
1609 fdctrl->fifo[0] =
1610 FD_SR0_RDYCHG + FD_RESET_SENSEI_COUNT - fdctrl->reset_sensei;
1611 fdctrl->reset_sensei--;
1612 } else {
1613 /* XXX: status0 handling is broken for read/write
1614 commands, so we do this hack. It should be suppressed
1615 ASAP */
1616 fdctrl->fifo[0] =
1617 FD_SR0_SEEK | (cur_drv->head << 2) | GET_CUR_DRV(fdctrl);
1618 }
1619
1620 fdctrl->fifo[1] = cur_drv->track;
1621 fdctrl_set_fifo(fdctrl, 2, 0);
1622 fdctrl_reset_irq(fdctrl);
1623 fdctrl->status0 = FD_SR0_RDYCHG;
1624 }
1625
1626 static void fdctrl_handle_seek (fdctrl_t *fdctrl, int direction)
1627 {
1628 fdrive_t *cur_drv;
1629
1630 SET_CUR_DRV(fdctrl, fdctrl->fifo[1] & FD_DOR_SELMASK);
1631 cur_drv = get_cur_drv(fdctrl);
1632 fdctrl_reset_fifo(fdctrl);
1633 if (fdctrl->fifo[2] > cur_drv->max_track) {
1634 fdctrl_raise_irq(fdctrl, FD_SR0_ABNTERM | FD_SR0_SEEK);
1635 } else {
1636 cur_drv->track = fdctrl->fifo[2];
1637 /* Raise Interrupt */
1638 fdctrl_raise_irq(fdctrl, FD_SR0_SEEK);
1639 }
1640 }
1641
1642 static void fdctrl_handle_perpendicular_mode (fdctrl_t *fdctrl, int direction)
1643 {
1644 fdrive_t *cur_drv = get_cur_drv(fdctrl);
1645
1646 if (fdctrl->fifo[1] & 0x80)
1647 cur_drv->perpendicular = fdctrl->fifo[1] & 0x7;
1648 /* No result back */
1649 fdctrl_reset_fifo(fdctrl);
1650 }
1651
1652 static void fdctrl_handle_configure (fdctrl_t *fdctrl, int direction)
1653 {
1654 fdctrl->config = fdctrl->fifo[2];
1655 fdctrl->precomp_trk = fdctrl->fifo[3];
1656 /* No result back */
1657 fdctrl_reset_fifo(fdctrl);
1658 }
1659
1660 static void fdctrl_handle_powerdown_mode (fdctrl_t *fdctrl, int direction)
1661 {
1662 fdctrl->pwrd = fdctrl->fifo[1];
1663 fdctrl->fifo[0] = fdctrl->fifo[1];
1664 fdctrl_set_fifo(fdctrl, 1, 1);
1665 }
1666
1667 static void fdctrl_handle_option (fdctrl_t *fdctrl, int direction)
1668 {
1669 /* No result back */
1670 fdctrl_reset_fifo(fdctrl);
1671 }
1672
1673 static void fdctrl_handle_drive_specification_command (fdctrl_t *fdctrl, int direction)
1674 {
1675 fdrive_t *cur_drv = get_cur_drv(fdctrl);
1676
1677 if (fdctrl->fifo[fdctrl->data_pos - 1] & 0x80) {
1678 /* Command parameters done */
1679 if (fdctrl->fifo[fdctrl->data_pos - 1] & 0x40) {
1680 fdctrl->fifo[0] = fdctrl->fifo[1];
1681 fdctrl->fifo[2] = 0;
1682 fdctrl->fifo[3] = 0;
1683 fdctrl_set_fifo(fdctrl, 4, 1);
1684 } else {
1685 fdctrl_reset_fifo(fdctrl);
1686 }
1687 } else if (fdctrl->data_len > 7) {
1688 /* ERROR */
1689 fdctrl->fifo[0] = 0x80 |
1690 (cur_drv->head << 2) | GET_CUR_DRV(fdctrl);
1691 fdctrl_set_fifo(fdctrl, 1, 1);
1692 }
1693 }
1694
1695 static void fdctrl_handle_relative_seek_out (fdctrl_t *fdctrl, int direction)
1696 {
1697 fdrive_t *cur_drv;
1698
1699 SET_CUR_DRV(fdctrl, fdctrl->fifo[1] & FD_DOR_SELMASK);
1700 cur_drv = get_cur_drv(fdctrl);
1701 if (fdctrl->fifo[2] + cur_drv->track >= cur_drv->max_track) {
1702 cur_drv->track = cur_drv->max_track - 1;
1703 } else {
1704 cur_drv->track += fdctrl->fifo[2];
1705 }
1706 fdctrl_reset_fifo(fdctrl);
1707 /* Raise Interrupt */
1708 fdctrl_raise_irq(fdctrl, FD_SR0_SEEK);
1709 }
1710
1711 static void fdctrl_handle_relative_seek_in (fdctrl_t *fdctrl, int direction)
1712 {
1713 fdrive_t *cur_drv;
1714
1715 SET_CUR_DRV(fdctrl, fdctrl->fifo[1] & FD_DOR_SELMASK);
1716 cur_drv = get_cur_drv(fdctrl);
1717 if (fdctrl->fifo[2] > cur_drv->track) {
1718 cur_drv->track = 0;
1719 } else {
1720 cur_drv->track -= fdctrl->fifo[2];
1721 }
1722 fdctrl_reset_fifo(fdctrl);
1723 /* Raise Interrupt */
1724 fdctrl_raise_irq(fdctrl, FD_SR0_SEEK);
1725 }
1726
1727 static const struct {
1728 uint8_t value;
1729 uint8_t mask;
1730 const char* name;
1731 int parameters;
1732 void (*handler)(fdctrl_t *fdctrl, int direction);
1733 int direction;
1734 } handlers[] = {
1735 { FD_CMD_READ, 0x1f, "READ", 8, fdctrl_start_transfer, FD_DIR_READ },
1736 { FD_CMD_WRITE, 0x3f, "WRITE", 8, fdctrl_start_transfer, FD_DIR_WRITE },
1737 { FD_CMD_SEEK, 0xff, "SEEK", 2, fdctrl_handle_seek },
1738 { FD_CMD_SENSE_INTERRUPT_STATUS, 0xff, "SENSE INTERRUPT STATUS", 0, fdctrl_handle_sense_interrupt_status },
1739 { FD_CMD_RECALIBRATE, 0xff, "RECALIBRATE", 1, fdctrl_handle_recalibrate },
1740 { FD_CMD_FORMAT_TRACK, 0xbf, "FORMAT TRACK", 5, fdctrl_handle_format_track },
1741 { FD_CMD_READ_TRACK, 0xbf, "READ TRACK", 8, fdctrl_start_transfer, FD_DIR_READ },
1742 { FD_CMD_RESTORE, 0xff, "RESTORE", 17, fdctrl_handle_restore }, /* part of READ DELETED DATA */
1743 { FD_CMD_SAVE, 0xff, "SAVE", 0, fdctrl_handle_save }, /* part of READ DELETED DATA */
1744 { FD_CMD_READ_DELETED, 0x1f, "READ DELETED DATA", 8, fdctrl_start_transfer_del, FD_DIR_READ },
1745 { FD_CMD_SCAN_EQUAL, 0x1f, "SCAN EQUAL", 8, fdctrl_start_transfer, FD_DIR_SCANE },
1746 { FD_CMD_VERIFY, 0x1f, "VERIFY", 8, fdctrl_unimplemented },
1747 { FD_CMD_SCAN_LOW_OR_EQUAL, 0x1f, "SCAN LOW OR EQUAL", 8, fdctrl_start_transfer, FD_DIR_SCANL },
1748 { FD_CMD_SCAN_HIGH_OR_EQUAL, 0x1f, "SCAN HIGH OR EQUAL", 8, fdctrl_start_transfer, FD_DIR_SCANH },
1749 { FD_CMD_WRITE_DELETED, 0x3f, "WRITE DELETED DATA", 8, fdctrl_start_transfer_del, FD_DIR_WRITE },
1750 { FD_CMD_READ_ID, 0xbf, "READ ID", 1, fdctrl_handle_readid },
1751 { FD_CMD_SPECIFY, 0xff, "SPECIFY", 2, fdctrl_handle_specify },
1752 { FD_CMD_SENSE_DRIVE_STATUS, 0xff, "SENSE DRIVE STATUS", 1, fdctrl_handle_sense_drive_status },
1753 { FD_CMD_PERPENDICULAR_MODE, 0xff, "PERPENDICULAR MODE", 1, fdctrl_handle_perpendicular_mode },
1754 { FD_CMD_CONFIGURE, 0xff, "CONFIGURE", 3, fdctrl_handle_configure },
1755 { FD_CMD_POWERDOWN_MODE, 0xff, "POWERDOWN MODE", 2, fdctrl_handle_powerdown_mode },
1756 { FD_CMD_OPTION, 0xff, "OPTION", 1, fdctrl_handle_option },
1757 { FD_CMD_DRIVE_SPECIFICATION_COMMAND, 0xff, "DRIVE SPECIFICATION COMMAND", 5, fdctrl_handle_drive_specification_command },
1758 { FD_CMD_RELATIVE_SEEK_OUT, 0xff, "RELATIVE SEEK OUT", 2, fdctrl_handle_relative_seek_out },
1759 { FD_CMD_FORMAT_AND_WRITE, 0xff, "FORMAT AND WRITE", 10, fdctrl_unimplemented },
1760 { FD_CMD_RELATIVE_SEEK_IN, 0xff, "RELATIVE SEEK IN", 2, fdctrl_handle_relative_seek_in },
1761 { FD_CMD_LOCK, 0x7f, "LOCK", 0, fdctrl_handle_lock },
1762 { FD_CMD_DUMPREG, 0xff, "DUMPREG", 0, fdctrl_handle_dumpreg },
1763 { FD_CMD_VERSION, 0xff, "VERSION", 0, fdctrl_handle_version },
1764 { FD_CMD_PART_ID, 0xff, "PART ID", 0, fdctrl_handle_partid },
1765 { FD_CMD_WRITE, 0x1f, "WRITE (BeOS)", 8, fdctrl_start_transfer, FD_DIR_WRITE }, /* not in specification ; BeOS 4.5 bug */
1766 { 0, 0, "unknown", 0, fdctrl_unimplemented }, /* default handler */
1767 };
1768 /* Associate command to an index in the 'handlers' array */
1769 static uint8_t command_to_handler[256];
1770
1771 static void fdctrl_write_data (fdctrl_t *fdctrl, uint32_t value)
1772 {
1773 fdrive_t *cur_drv;
1774 int pos;
1775
1776 /* Reset mode */
1777 if (!(fdctrl->dor & FD_DOR_nRESET)) {
1778 FLOPPY_DPRINTF("Floppy controller in RESET state !\n");
1779 return;
1780 }
1781 if (!(fdctrl->msr & FD_MSR_RQM) || (fdctrl->msr & FD_MSR_DIO)) {
1782 FLOPPY_ERROR("controller not ready for writing\n");
1783 return;
1784 }
1785 fdctrl->dsr &= ~FD_DSR_PWRDOWN;
1786 /* Is it write command time ? */
1787 if (fdctrl->msr & FD_MSR_NONDMA) {
1788 /* FIFO data write */
1789 pos = fdctrl->data_pos++;
1790 pos %= FD_SECTOR_LEN;
1791 fdctrl->fifo[pos] = value;
1792 if (pos == FD_SECTOR_LEN - 1 ||
1793 fdctrl->data_pos == fdctrl->data_len) {
1794 cur_drv = get_cur_drv(fdctrl);
1795 if (bdrv_write(cur_drv->bs, fd_sector(cur_drv), fdctrl->fifo, 1) < 0) {
1796 FLOPPY_ERROR("writing sector %d\n", fd_sector(cur_drv));
1797 return;
1798 }
1799 if (!fdctrl_seek_to_next_sect(fdctrl, cur_drv)) {
1800 FLOPPY_DPRINTF("error seeking to next sector %d\n",
1801 fd_sector(cur_drv));
1802 return;
1803 }
1804 }
1805 /* Switch from transfer mode to status mode
1806 * then from status mode to command mode
1807 */
1808 if (fdctrl->data_pos == fdctrl->data_len)
1809 fdctrl_stop_transfer(fdctrl, FD_SR0_SEEK, 0x00, 0x00);
1810 return;
1811 }
1812 if (fdctrl->data_pos == 0) {
1813 /* Command */
1814 pos = command_to_handler[value & 0xff];
1815 FLOPPY_DPRINTF("%s command\n", handlers[pos].name);
1816 fdctrl->data_len = handlers[pos].parameters + 1;
1817 }
1818
1819 FLOPPY_DPRINTF("%s: %02x\n", __func__, value);
1820 fdctrl->fifo[fdctrl->data_pos++] = value;
1821 if (fdctrl->data_pos == fdctrl->data_len) {
1822 /* We now have all parameters
1823 * and will be able to treat the command
1824 */
1825 if (fdctrl->data_state & FD_STATE_FORMAT) {
1826 fdctrl_format_sector(fdctrl);
1827 return;
1828 }
1829
1830 pos = command_to_handler[fdctrl->fifo[0] & 0xff];
1831 FLOPPY_DPRINTF("treat %s command\n", handlers[pos].name);
1832 (*handlers[pos].handler)(fdctrl, handlers[pos].direction);
1833 }
1834 }
1835
1836 static void fdctrl_result_timer(void *opaque)
1837 {
1838 fdctrl_t *fdctrl = opaque;
1839 fdrive_t *cur_drv = get_cur_drv(fdctrl);
1840
1841 /* Pretend we are spinning.
1842 * This is needed for Coherent, which uses READ ID to check for
1843 * sector interleaving.
1844 */
1845 if (cur_drv->last_sect != 0) {
1846 cur_drv->sect = (cur_drv->sect % cur_drv->last_sect) + 1;
1847 }
1848 fdctrl_stop_transfer(fdctrl, 0x00, 0x00, 0x00);
1849 }
1850
1851 /* Init functions */
1852 static fdctrl_t *fdctrl_init_common (qemu_irq irq, int dma_chann,
1853 target_phys_addr_t io_base,
1854 BlockDriverState **fds)
1855 {
1856 fdctrl_t *fdctrl;
1857 int i, j;
1858
1859 /* Fill 'command_to_handler' lookup table */
1860 for (i = ARRAY_SIZE(handlers) - 1; i >= 0; i--) {
1861 for (j = 0; j < sizeof(command_to_handler); j++) {
1862 if ((j & handlers[i].mask) == handlers[i].value)
1863 command_to_handler[j] = i;
1864 }
1865 }
1866
1867 FLOPPY_DPRINTF("init controller\n");
1868 fdctrl = qemu_mallocz(sizeof(fdctrl_t));
1869 fdctrl->fifo = qemu_memalign(512, FD_SECTOR_LEN);
1870 fdctrl->result_timer = qemu_new_timer(vm_clock,
1871 fdctrl_result_timer, fdctrl);
1872
1873 fdctrl->version = 0x90; /* Intel 82078 controller */
1874 fdctrl->irq = irq;
1875 fdctrl->dma_chann = dma_chann;
1876 fdctrl->io_base = io_base;
1877 fdctrl->config = FD_CONFIG_EIS | FD_CONFIG_EFIFO; /* Implicit seek, polling & FIFO enabled */
1878 if (fdctrl->dma_chann != -1) {
1879 DMA_register_channel(dma_chann, &fdctrl_transfer_handler, fdctrl);
1880 }
1881 for (i = 0; i < MAX_FD; i++) {
1882 fd_init(&fdctrl->drives[i], fds[i]);
1883 }
1884 fdctrl_external_reset(fdctrl);
1885 register_savevm("fdc", io_base, 2, fdc_save, fdc_load, fdctrl);
1886 qemu_register_reset(fdctrl_external_reset, 0, fdctrl);
1887 for (i = 0; i < MAX_FD; i++) {
1888 fd_revalidate(&fdctrl->drives[i]);
1889 }
1890
1891 return fdctrl;
1892 }
1893
1894 fdctrl_t *fdctrl_init (qemu_irq irq, int dma_chann, int mem_mapped,
1895 target_phys_addr_t io_base,
1896 BlockDriverState **fds)
1897 {
1898 fdctrl_t *fdctrl;
1899 int io_mem;
1900
1901 fdctrl = fdctrl_init_common(irq, dma_chann, io_base, fds);
1902
1903 fdctrl->sun4m = 0;
1904 if (mem_mapped) {
1905 io_mem = cpu_register_io_memory(0, fdctrl_mem_read, fdctrl_mem_write,
1906 fdctrl);
1907 cpu_register_physical_memory(io_base, 0x08, io_mem);
1908 } else {
1909 register_ioport_read((uint32_t)io_base + 0x01, 5, 1,
1910 &fdctrl_read_port, fdctrl);
1911 register_ioport_read((uint32_t)io_base + 0x07, 1, 1,
1912 &fdctrl_read_port, fdctrl);
1913 register_ioport_write((uint32_t)io_base + 0x01, 5, 1,
1914 &fdctrl_write_port, fdctrl);
1915 register_ioport_write((uint32_t)io_base + 0x07, 1, 1,
1916 &fdctrl_write_port, fdctrl);
1917 }
1918
1919 return fdctrl;
1920 }
1921
1922 fdctrl_t *sun4m_fdctrl_init (qemu_irq irq, target_phys_addr_t io_base,
1923 BlockDriverState **fds, qemu_irq *fdc_tc)
1924 {
1925 fdctrl_t *fdctrl;
1926 int io_mem;
1927
1928 fdctrl = fdctrl_init_common(irq, -1, io_base, fds);
1929 fdctrl->sun4m = 1;
1930 io_mem = cpu_register_io_memory(0, fdctrl_mem_read_strict,
1931 fdctrl_mem_write_strict,
1932 fdctrl);
1933 cpu_register_physical_memory(io_base, 0x08, io_mem);
1934 *fdc_tc = *qemu_allocate_irqs(fdctrl_handle_tc, fdctrl, 1);
1935
1936 return fdctrl;
1937 }
Anthony Liguori's QEMU queue