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1/* $Id: parport.h,v 1.1 1998/05/17 10:57:52 andrea Exp andrea $ */
2
3/*
4 * Any part of this program may be used in documents licensed under
5 * the GNU Free Documentation License, Version 1.1 or any later version
6 * published by the Free Software Foundation.
7 */
8
9#ifndef _PARPORT_H_
10#define _PARPORT_H_
11
12/* Start off with user-visible constants */
13
14/* Maximum of 16 ports per machine */
15#define PARPORT_MAX 16
16
17/* Magic numbers */
18#define PARPORT_IRQ_NONE -1
19#define PARPORT_DMA_NONE -1
20#define PARPORT_IRQ_AUTO -2
21#define PARPORT_DMA_AUTO -2
22#define PARPORT_DMA_NOFIFO -3
23#define PARPORT_DISABLE -2
24#define PARPORT_IRQ_PROBEONLY -3
25#define PARPORT_IOHI_AUTO -1
26
27#define PARPORT_CONTROL_STROBE 0x1
28#define PARPORT_CONTROL_AUTOFD 0x2
29#define PARPORT_CONTROL_INIT 0x4
30#define PARPORT_CONTROL_SELECT 0x8
31
32#define PARPORT_STATUS_ERROR 0x8
33#define PARPORT_STATUS_SELECT 0x10
34#define PARPORT_STATUS_PAPEROUT 0x20
35#define PARPORT_STATUS_ACK 0x40
36#define PARPORT_STATUS_BUSY 0x80
37
38/* Type classes for Plug-and-Play probe. */
39typedef enum {
40 PARPORT_CLASS_LEGACY = 0, /* Non-IEEE1284 device */
41 PARPORT_CLASS_PRINTER,
42 PARPORT_CLASS_MODEM,
43 PARPORT_CLASS_NET,
44 PARPORT_CLASS_HDC, /* Hard disk controller */
45 PARPORT_CLASS_PCMCIA,
46 PARPORT_CLASS_MEDIA, /* Multimedia device */
47 PARPORT_CLASS_FDC, /* Floppy disk controller */
48 PARPORT_CLASS_PORTS,
49 PARPORT_CLASS_SCANNER,
50 PARPORT_CLASS_DIGCAM,
51 PARPORT_CLASS_OTHER, /* Anything else */
52 PARPORT_CLASS_UNSPEC, /* No CLS field in ID */
53 PARPORT_CLASS_SCSIADAPTER
54} parport_device_class;
55
56/* The "modes" entry in parport is a bit field representing the
57 capabilities of the hardware. */
58#define PARPORT_MODE_PCSPP (1<<0) /* IBM PC registers available. */
59#define PARPORT_MODE_TRISTATE (1<<1) /* Can tristate. */
60#define PARPORT_MODE_EPP (1<<2) /* Hardware EPP. */
61#define PARPORT_MODE_ECP (1<<3) /* Hardware ECP. */
62#define PARPORT_MODE_COMPAT (1<<4) /* Hardware 'printer protocol'. */
63#define PARPORT_MODE_DMA (1<<5) /* Hardware can DMA. */
64#define PARPORT_MODE_SAFEININT (1<<6) /* SPP registers accessible in IRQ. */
65
66/* IEEE1284 modes:
67 Nibble mode, byte mode, ECP, ECPRLE and EPP are their own
68 'extensibility request' values. Others are special.
69 'Real' ECP modes must have the IEEE1284_MODE_ECP bit set. */
70#define IEEE1284_MODE_NIBBLE 0
71#define IEEE1284_MODE_BYTE (1<<0)
72#define IEEE1284_MODE_COMPAT (1<<8)
73#define IEEE1284_MODE_BECP (1<<9) /* Bounded ECP mode */
74#define IEEE1284_MODE_ECP (1<<4)
75#define IEEE1284_MODE_ECPRLE (IEEE1284_MODE_ECP | (1<<5))
76#define IEEE1284_MODE_ECPSWE (1<<10) /* Software-emulated */
77#define IEEE1284_MODE_EPP (1<<6)
78#define IEEE1284_MODE_EPPSL (1<<11) /* EPP 1.7 */
79#define IEEE1284_MODE_EPPSWE (1<<12) /* Software-emulated */
80#define IEEE1284_DEVICEID (1<<2) /* This is a flag */
81#define IEEE1284_EXT_LINK (1<<14) /* This flag causes the
82 * extensibility link to
83 * be requested, using
84 * bits 0-6. */
85
86/* For the benefit of parport_read/write, you can use these with
87 * parport_negotiate to use address operations. They have no effect
88 * other than to make parport_read/write use address transfers. */
89#define IEEE1284_ADDR (1<<13) /* This is a flag */
90#define IEEE1284_DATA 0 /* So is this */
91
92/* Flags for block transfer operations. */
93#define PARPORT_EPP_FAST (1<<0) /* Unreliable counts. */
94#define PARPORT_W91284PIC (1<<1) /* have a Warp9 w91284pic in the device */
95
96/* The rest is for the kernel only */
97#ifdef __KERNEL__
98
99#include <linux/config.h>
100#include <linux/jiffies.h>
101#include <linux/proc_fs.h>
102#include <linux/spinlock.h>
103#include <linux/wait.h>
104#include <asm/system.h>
105#include <asm/ptrace.h>
106#include <asm/semaphore.h>
107
108/* Define this later. */
109struct parport;
110struct pardevice;
111
112struct pc_parport_state {
113 unsigned int ctr;
114 unsigned int ecr;
115};
116
117struct ax_parport_state {
118 unsigned int ctr;
119 unsigned int ecr;
120 unsigned int dcsr;
121};
122
123/* used by both parport_amiga and parport_mfc3 */
124struct amiga_parport_state {
125 unsigned char data; /* ciaa.prb */
126 unsigned char datadir; /* ciaa.ddrb */
127 unsigned char status; /* ciab.pra & 7 */
128 unsigned char statusdir;/* ciab.ddrb & 7 */
129};
130
131struct ip32_parport_state {
132 unsigned int dcr;
133 unsigned int ecr;
134};
135
136struct parport_state {
137 union {
138 struct pc_parport_state pc;
139 /* ARC has no state. */
140 struct ax_parport_state ax;
141 struct amiga_parport_state amiga;
142 /* Atari has not state. */
143 struct ip32_parport_state ip32;
144 void *misc;
145 } u;
146};
147
148struct parport_operations {
149 /* IBM PC-style virtual registers. */
150 void (*write_data)(struct parport *, unsigned char);
151 unsigned char (*read_data)(struct parport *);
152
153 void (*write_control)(struct parport *, unsigned char);
154 unsigned char (*read_control)(struct parport *);
155 unsigned char (*frob_control)(struct parport *, unsigned char mask,
156 unsigned char val);
157
158 unsigned char (*read_status)(struct parport *);
159
160 /* IRQs. */
161 void (*enable_irq)(struct parport *);
162 void (*disable_irq)(struct parport *);
163
164 /* Data direction. */
165 void (*data_forward) (struct parport *);
166 void (*data_reverse) (struct parport *);
167
168 /* For core parport code. */
169 void (*init_state)(struct pardevice *, struct parport_state *);
170 void (*save_state)(struct parport *, struct parport_state *);
171 void (*restore_state)(struct parport *, struct parport_state *);
172
173 /* Block read/write */
174 size_t (*epp_write_data) (struct parport *port, const void *buf,
175 size_t len, int flags);
176 size_t (*epp_read_data) (struct parport *port, void *buf, size_t len,
177 int flags);
178 size_t (*epp_write_addr) (struct parport *port, const void *buf,
179 size_t len, int flags);
180 size_t (*epp_read_addr) (struct parport *port, void *buf, size_t len,
181 int flags);
182
183 size_t (*ecp_write_data) (struct parport *port, const void *buf,
184 size_t len, int flags);
185 size_t (*ecp_read_data) (struct parport *port, void *buf, size_t len,
186 int flags);
187 size_t (*ecp_write_addr) (struct parport *port, const void *buf,
188 size_t len, int flags);
189
190 size_t (*compat_write_data) (struct parport *port, const void *buf,
191 size_t len, int flags);
192 size_t (*nibble_read_data) (struct parport *port, void *buf,
193 size_t len, int flags);
194 size_t (*byte_read_data) (struct parport *port, void *buf,
195 size_t len, int flags);
196 struct module *owner;
197};
198
199struct parport_device_info {
200 parport_device_class class;
201 const char *class_name;
202 const char *mfr;
203 const char *model;
204 const char *cmdset;
205 const char *description;
206};
207
208/* Each device can have two callback functions:
209 * 1) a preemption function, called by the resource manager to request
210 * that the driver relinquish control of the port. The driver should
211 * return zero if it agrees to release the port, and nonzero if it
212 * refuses. Do not call parport_release() - the kernel will do this
213 * implicitly.
214 *
215 * 2) a wake-up function, called by the resource manager to tell drivers
216 * that the port is available to be claimed. If a driver wants to use
217 * the port, it should call parport_claim() here.
218 */
219
220/* A parallel port device */
221struct pardevice {
222 const char *name;
223 struct parport *port;
224 int daisy;
225 int (*preempt)(void *);
226 void (*wakeup)(void *);
227 void *private;
228 void (*irq_func)(int, void *, struct pt_regs *);
229 unsigned int flags;
230 struct pardevice *next;
231 struct pardevice *prev;
232 struct parport_state *state; /* saved status over preemption */
233 wait_queue_head_t wait_q;
234 unsigned long int time;
235 unsigned long int timeslice;
236 volatile long int timeout;
237 unsigned long waiting; /* long req'd for set_bit --RR */
238 struct pardevice *waitprev;
239 struct pardevice *waitnext;
240 void * sysctl_table;
241};
242
243/* IEEE1284 information */
244
245/* IEEE1284 phases. These are exposed to userland through ppdev IOCTL
246 * PP[GS]ETPHASE, so do not change existing values. */
247enum ieee1284_phase {
248 IEEE1284_PH_FWD_DATA,
249 IEEE1284_PH_FWD_IDLE,
250 IEEE1284_PH_TERMINATE,
251 IEEE1284_PH_NEGOTIATION,
252 IEEE1284_PH_HBUSY_DNA,
253 IEEE1284_PH_REV_IDLE,
254 IEEE1284_PH_HBUSY_DAVAIL,
255 IEEE1284_PH_REV_DATA,
256 IEEE1284_PH_ECP_SETUP,
257 IEEE1284_PH_ECP_FWD_TO_REV,
258 IEEE1284_PH_ECP_REV_TO_FWD,
259 IEEE1284_PH_ECP_DIR_UNKNOWN,
260};
261struct ieee1284_info {
262 int mode;
263 volatile enum ieee1284_phase phase;
264 struct semaphore irq;
265};
266
267/* A parallel port */
268struct parport {
269 unsigned long base; /* base address */
270 unsigned long base_hi; /* base address (hi - ECR) */
271 unsigned int size; /* IO extent */
272 const char *name;
273 unsigned int modes;
274 int irq; /* interrupt (or -1 for none) */
275 int dma;
276 int muxport; /* which muxport (if any) this is */
277 int portnum; /* which physical parallel port (not mux) */
278
279 struct parport *physport;
280 /* If this is a non-default mux
281 parport, i.e. we're a clone of a real
282 physical port, this is a pointer to that
283 port. The locking is only done in the
284 real port. For a clone port, the
285 following structure members are
286 meaningless: devices, cad, muxsel,
287 waithead, waittail, flags, pdir,
288 ieee1284, *_lock.
289
290 It this is a default mux parport, or
291 there is no mux involved, this points to
292 ourself. */
293
294 struct pardevice *devices;
295 struct pardevice *cad; /* port owner */
296 int daisy; /* currently selected daisy addr */
297 int muxsel; /* currently selected mux port */
298
299 struct pardevice *waithead;
300 struct pardevice *waittail;
301
302 struct list_head list;
303 unsigned int flags;
304
305 void *sysctl_table;
306 struct parport_device_info probe_info[5]; /* 0-3 + non-IEEE1284.3 */
307 struct ieee1284_info ieee1284;
308
309 struct parport_operations *ops;
310 void *private_data; /* for lowlevel driver */
311
312 int number; /* port index - the `n' in `parportn' */
313 spinlock_t pardevice_lock;
314 spinlock_t waitlist_lock;
315 rwlock_t cad_lock;
316
317 int spintime;
318 atomic_t ref_count;
319
320 struct list_head full_list;
321 struct parport *slaves[3];
322};
323
324#define DEFAULT_SPIN_TIME 500 /* us */
325
326struct parport_driver {
327 const char *name;
328 void (*attach) (struct parport *);
329 void (*detach) (struct parport *);
330 struct list_head list;
331};
332
333/* parport_register_port registers a new parallel port at the given
334 address (if one does not already exist) and returns a pointer to it.
335 This entails claiming the I/O region, IRQ and DMA. NULL is returned
336 if initialisation fails. */
337struct parport *parport_register_port(unsigned long base, int irq, int dma,
338 struct parport_operations *ops);
339
340/* Once a registered port is ready for high-level drivers to use, the
341 low-level driver that registered it should announce it. This will
342 call the high-level drivers' attach() functions (after things like
343 determining the IEEE 1284.3 topology of the port and collecting
344 DeviceIDs). */
345void parport_announce_port (struct parport *port);
346
347/* Unregister a port. */
348extern void parport_remove_port(struct parport *port);
349
350/* Register a new high-level driver. */
351extern int parport_register_driver (struct parport_driver *);
352
353/* Unregister a high-level driver. */
354extern void parport_unregister_driver (struct parport_driver *);
355
356/* If parport_register_driver doesn't fit your needs, perhaps
357 * parport_find_xxx does. */
358extern struct parport *parport_find_number (int);
359extern struct parport *parport_find_base (unsigned long);
360
361/* Reference counting for ports. */
362extern struct parport *parport_get_port (struct parport *);
363extern void parport_put_port (struct parport *);
364
365/* parport_register_device declares that a device is connected to a
366 port, and tells the kernel all it needs to know.
367 - pf is the preemption function (may be NULL for no callback)
368 - kf is the wake-up function (may be NULL for no callback)
369 - irq_func is the interrupt handler (may be NULL for no interrupts)
370 - handle is a user pointer that gets handed to callback functions. */
371struct pardevice *parport_register_device(struct parport *port,
372 const char *name,
373 int (*pf)(void *), void (*kf)(void *),
374 void (*irq_func)(int, void *, struct pt_regs *),
375 int flags, void *handle);
376
377/* parport_unregister unlinks a device from the chain. */
378extern void parport_unregister_device(struct pardevice *dev);
379
380/* parport_claim tries to gain ownership of the port for a particular
381 driver. This may fail (return non-zero) if another driver is busy.
382 If this driver has registered an interrupt handler, it will be
383 enabled. */
384extern int parport_claim(struct pardevice *dev);
385
386/* parport_claim_or_block is the same, but sleeps if the port cannot
387 be claimed. Return value is 1 if it slept, 0 normally and -errno
388 on error. */
389extern int parport_claim_or_block(struct pardevice *dev);
390
391/* parport_release reverses a previous parport_claim. This can never
392 fail, though the effects are undefined (except that they are bad)
393 if you didn't previously own the port. Once you have released the
394 port you should make sure that neither your code nor the hardware
395 on the port tries to initiate any communication without first
396 re-claiming the port. If you mess with the port state (enabling
397 ECP for example) you should clean up before releasing the port. */
398
399extern void parport_release(struct pardevice *dev);
400
401/**
402 * parport_yield - relinquish a parallel port temporarily
403 * @dev: a device on the parallel port
404 *
405 * This function relinquishes the port if it would be helpful to other
406 * drivers to do so. Afterwards it tries to reclaim the port using
407 * parport_claim(), and the return value is the same as for
408 * parport_claim(). If it fails, the port is left unclaimed and it is
409 * the driver's responsibility to reclaim the port.
410 *
411 * The parport_yield() and parport_yield_blocking() functions are for
412 * marking points in the driver at which other drivers may claim the
413 * port and use their devices. Yielding the port is similar to
414 * releasing it and reclaiming it, but is more efficient because no
415 * action is taken if there are no other devices needing the port. In
416 * fact, nothing is done even if there are other devices waiting but
417 * the current device is still within its "timeslice". The default
418 * timeslice is half a second, but it can be adjusted via the /proc
419 * interface.
420 **/
421static __inline__ int parport_yield(struct pardevice *dev)
422{
423 unsigned long int timeslip = (jiffies - dev->time);
424 if ((dev->port->waithead == NULL) || (timeslip < dev->timeslice))
425 return 0;
426 parport_release(dev);
427 return parport_claim(dev);
428}
429
430/**
431 * parport_yield_blocking - relinquish a parallel port temporarily
432 * @dev: a device on the parallel port
433 *
434 * This function relinquishes the port if it would be helpful to other
435 * drivers to do so. Afterwards it tries to reclaim the port using
436 * parport_claim_or_block(), and the return value is the same as for
437 * parport_claim_or_block().
438 **/
439static __inline__ int parport_yield_blocking(struct pardevice *dev)
440{
441 unsigned long int timeslip = (jiffies - dev->time);
442 if ((dev->port->waithead == NULL) || (timeslip < dev->timeslice))
443 return 0;
444 parport_release(dev);
445 return parport_claim_or_block(dev);
446}
447
448/* Flags used to identify what a device does. */
449#define PARPORT_DEV_TRAN 0 /* WARNING !! DEPRECATED !! */
450#define PARPORT_DEV_LURK (1<<0) /* WARNING !! DEPRECATED !! */
451#define PARPORT_DEV_EXCL (1<<1) /* Need exclusive access. */
452
453#define PARPORT_FLAG_EXCL (1<<1) /* EXCL driver registered. */
454
455/* IEEE1284 functions */
456extern void parport_ieee1284_interrupt (int, void *, struct pt_regs *);
457extern int parport_negotiate (struct parport *, int mode);
458extern ssize_t parport_write (struct parport *, const void *buf, size_t len);
459extern ssize_t parport_read (struct parport *, void *buf, size_t len);
460
461#define PARPORT_INACTIVITY_O_NONBLOCK 1
462extern long parport_set_timeout (struct pardevice *, long inactivity);
463
464extern int parport_wait_event (struct parport *, long timeout);
465extern int parport_wait_peripheral (struct parport *port,
466 unsigned char mask,
467 unsigned char val);
468extern int parport_poll_peripheral (struct parport *port,
469 unsigned char mask,
470 unsigned char val,
471 int usec);
472
473/* For architectural drivers */
474extern size_t parport_ieee1284_write_compat (struct parport *,
475 const void *, size_t, int);
476extern size_t parport_ieee1284_read_nibble (struct parport *,
477 void *, size_t, int);
478extern size_t parport_ieee1284_read_byte (struct parport *,
479 void *, size_t, int);
480extern size_t parport_ieee1284_ecp_read_data (struct parport *,
481 void *, size_t, int);
482extern size_t parport_ieee1284_ecp_write_data (struct parport *,
483 const void *, size_t, int);
484extern size_t parport_ieee1284_ecp_write_addr (struct parport *,
485 const void *, size_t, int);
486extern size_t parport_ieee1284_epp_write_data (struct parport *,
487 const void *, size_t, int);
488extern size_t parport_ieee1284_epp_read_data (struct parport *,
489 void *, size_t, int);
490extern size_t parport_ieee1284_epp_write_addr (struct parport *,
491 const void *, size_t, int);
492extern size_t parport_ieee1284_epp_read_addr (struct parport *,
493 void *, size_t, int);
494
495/* IEEE1284.3 functions */
496extern int parport_daisy_init (struct parport *port);
497extern void parport_daisy_fini (struct parport *port);
498extern struct pardevice *parport_open (int devnum, const char *name,
499 int (*pf) (void *),
500 void (*kf) (void *),
501 void (*irqf) (int, void *,
502 struct pt_regs *),
503 int flags, void *handle);
504extern void parport_close (struct pardevice *dev);
505extern ssize_t parport_device_id (int devnum, char *buffer, size_t len);
506extern int parport_device_num (int parport, int mux, int daisy);
507extern void parport_daisy_deselect_all (struct parport *port);
508extern int parport_daisy_select (struct parport *port, int daisy, int mode);
509
510/* Lowlevel drivers _can_ call this support function to handle irqs. */
511static __inline__ void parport_generic_irq(int irq, struct parport *port,
512 struct pt_regs *regs)
513{
514 parport_ieee1284_interrupt (irq, port, regs);
515 read_lock(&port->cad_lock);
516 if (port->cad && port->cad->irq_func)
517 port->cad->irq_func(irq, port->cad->private, regs);
518 read_unlock(&port->cad_lock);
519}
520
521/* Prototypes from parport_procfs */
522extern int parport_proc_register(struct parport *pp);
523extern int parport_proc_unregister(struct parport *pp);
524extern int parport_device_proc_register(struct pardevice *device);
525extern int parport_device_proc_unregister(struct pardevice *device);
526
527/* If PC hardware is the only type supported, we can optimise a bit. */
528#if !defined(CONFIG_PARPORT_NOT_PC)
529
530#include <linux/parport_pc.h>
531#define parport_write_data(p,x) parport_pc_write_data(p,x)
532#define parport_read_data(p) parport_pc_read_data(p)
533#define parport_write_control(p,x) parport_pc_write_control(p,x)
534#define parport_read_control(p) parport_pc_read_control(p)
535#define parport_frob_control(p,m,v) parport_pc_frob_control(p,m,v)
536#define parport_read_status(p) parport_pc_read_status(p)
537#define parport_enable_irq(p) parport_pc_enable_irq(p)
538#define parport_disable_irq(p) parport_pc_disable_irq(p)
539#define parport_data_forward(p) parport_pc_data_forward(p)
540#define parport_data_reverse(p) parport_pc_data_reverse(p)
541
542#else /* !CONFIG_PARPORT_NOT_PC */
543
544/* Generic operations vector through the dispatch table. */
545#define parport_write_data(p,x) (p)->ops->write_data(p,x)
546#define parport_read_data(p) (p)->ops->read_data(p)
547#define parport_write_control(p,x) (p)->ops->write_control(p,x)
548#define parport_read_control(p) (p)->ops->read_control(p)
549#define parport_frob_control(p,m,v) (p)->ops->frob_control(p,m,v)
550#define parport_read_status(p) (p)->ops->read_status(p)
551#define parport_enable_irq(p) (p)->ops->enable_irq(p)
552#define parport_disable_irq(p) (p)->ops->disable_irq(p)
553#define parport_data_forward(p) (p)->ops->data_forward(p)
554#define parport_data_reverse(p) (p)->ops->data_reverse(p)
555
556#endif /* !CONFIG_PARPORT_NOT_PC */
557
558#endif /* __KERNEL__ */
559#endif /* _PARPORT_H_ */