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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 parport_state {
132 union {
133 struct pc_parport_state pc;
134 /* ARC has no state. */
135 struct ax_parport_state ax;
136 struct amiga_parport_state amiga;
137 /* Atari has not state. */
138 void *misc;
139 } u;
140};
141
142struct parport_operations {
143 /* IBM PC-style virtual registers. */
144 void (*write_data)(struct parport *, unsigned char);
145 unsigned char (*read_data)(struct parport *);
146
147 void (*write_control)(struct parport *, unsigned char);
148 unsigned char (*read_control)(struct parport *);
149 unsigned char (*frob_control)(struct parport *, unsigned char mask,
150 unsigned char val);
151
152 unsigned char (*read_status)(struct parport *);
153
154 /* IRQs. */
155 void (*enable_irq)(struct parport *);
156 void (*disable_irq)(struct parport *);
157
158 /* Data direction. */
159 void (*data_forward) (struct parport *);
160 void (*data_reverse) (struct parport *);
161
162 /* For core parport code. */
163 void (*init_state)(struct pardevice *, struct parport_state *);
164 void (*save_state)(struct parport *, struct parport_state *);
165 void (*restore_state)(struct parport *, struct parport_state *);
166
167 /* Block read/write */
168 size_t (*epp_write_data) (struct parport *port, const void *buf,
169 size_t len, int flags);
170 size_t (*epp_read_data) (struct parport *port, void *buf, size_t len,
171 int flags);
172 size_t (*epp_write_addr) (struct parport *port, const void *buf,
173 size_t len, int flags);
174 size_t (*epp_read_addr) (struct parport *port, void *buf, size_t len,
175 int flags);
176
177 size_t (*ecp_write_data) (struct parport *port, const void *buf,
178 size_t len, int flags);
179 size_t (*ecp_read_data) (struct parport *port, void *buf, size_t len,
180 int flags);
181 size_t (*ecp_write_addr) (struct parport *port, const void *buf,
182 size_t len, int flags);
183
184 size_t (*compat_write_data) (struct parport *port, const void *buf,
185 size_t len, int flags);
186 size_t (*nibble_read_data) (struct parport *port, void *buf,
187 size_t len, int flags);
188 size_t (*byte_read_data) (struct parport *port, void *buf,
189 size_t len, int flags);
190 struct module *owner;
191};
192
193struct parport_device_info {
194 parport_device_class class;
195 const char *class_name;
196 const char *mfr;
197 const char *model;
198 const char *cmdset;
199 const char *description;
200};
201
202/* Each device can have two callback functions:
203 * 1) a preemption function, called by the resource manager to request
204 * that the driver relinquish control of the port. The driver should
205 * return zero if it agrees to release the port, and nonzero if it
206 * refuses. Do not call parport_release() - the kernel will do this
207 * implicitly.
208 *
209 * 2) a wake-up function, called by the resource manager to tell drivers
210 * that the port is available to be claimed. If a driver wants to use
211 * the port, it should call parport_claim() here.
212 */
213
214/* A parallel port device */
215struct pardevice {
216 const char *name;
217 struct parport *port;
218 int daisy;
219 int (*preempt)(void *);
220 void (*wakeup)(void *);
221 void *private;
222 void (*irq_func)(int, void *, struct pt_regs *);
223 unsigned int flags;
224 struct pardevice *next;
225 struct pardevice *prev;
226 struct parport_state *state; /* saved status over preemption */
227 wait_queue_head_t wait_q;
228 unsigned long int time;
229 unsigned long int timeslice;
230 volatile long int timeout;
231 unsigned long waiting; /* long req'd for set_bit --RR */
232 struct pardevice *waitprev;
233 struct pardevice *waitnext;
234 void * sysctl_table;
235};
236
237/* IEEE1284 information */
238
239/* IEEE1284 phases */
240enum ieee1284_phase {
241 IEEE1284_PH_FWD_DATA,
242 IEEE1284_PH_FWD_IDLE,
243 IEEE1284_PH_TERMINATE,
244 IEEE1284_PH_NEGOTIATION,
245 IEEE1284_PH_HBUSY_DNA,
246 IEEE1284_PH_REV_IDLE,
247 IEEE1284_PH_HBUSY_DAVAIL,
248 IEEE1284_PH_REV_DATA,
249 IEEE1284_PH_ECP_SETUP,
250 IEEE1284_PH_ECP_FWD_TO_REV,
251 IEEE1284_PH_ECP_REV_TO_FWD,
252 IEEE1284_PH_ECP_DIR_UNKNOWN,
253};
254struct ieee1284_info {
255 int mode;
256 volatile enum ieee1284_phase phase;
257 struct semaphore irq;
258};
259
260/* A parallel port */
261struct parport {
262 unsigned long base; /* base address */
263 unsigned long base_hi; /* base address (hi - ECR) */
264 unsigned int size; /* IO extent */
265 const char *name;
266 unsigned int modes;
267 int irq; /* interrupt (or -1 for none) */
268 int dma;
269 int muxport; /* which muxport (if any) this is */
270 int portnum; /* which physical parallel port (not mux) */
271
272 struct parport *physport;
273 /* If this is a non-default mux
274 parport, i.e. we're a clone of a real
275 physical port, this is a pointer to that
276 port. The locking is only done in the
277 real port. For a clone port, the
278 following structure members are
279 meaningless: devices, cad, muxsel,
280 waithead, waittail, flags, pdir,
281 ieee1284, *_lock.
282
283 It this is a default mux parport, or
284 there is no mux involved, this points to
285 ourself. */
286
287 struct pardevice *devices;
288 struct pardevice *cad; /* port owner */
289 int daisy; /* currently selected daisy addr */
290 int muxsel; /* currently selected mux port */
291
292 struct pardevice *waithead;
293 struct pardevice *waittail;
294
295 struct list_head list;
296 unsigned int flags;
297
298 void *sysctl_table;
299 struct parport_device_info probe_info[5]; /* 0-3 + non-IEEE1284.3 */
300 struct ieee1284_info ieee1284;
301
302 struct parport_operations *ops;
303 void *private_data; /* for lowlevel driver */
304
305 int number; /* port index - the `n' in `parportn' */
306 spinlock_t pardevice_lock;
307 spinlock_t waitlist_lock;
308 rwlock_t cad_lock;
309
310 int spintime;
311 atomic_t ref_count;
312
313 struct list_head full_list;
314 struct parport *slaves[3];
315};
316
317#define DEFAULT_SPIN_TIME 500 /* us */
318
319struct parport_driver {
320 const char *name;
321 void (*attach) (struct parport *);
322 void (*detach) (struct parport *);
323 struct list_head list;
324};
325
326/* parport_register_port registers a new parallel port at the given
327 address (if one does not already exist) and returns a pointer to it.
328 This entails claiming the I/O region, IRQ and DMA. NULL is returned
329 if initialisation fails. */
330struct parport *parport_register_port(unsigned long base, int irq, int dma,
331 struct parport_operations *ops);
332
333/* Once a registered port is ready for high-level drivers to use, the
334 low-level driver that registered it should announce it. This will
335 call the high-level drivers' attach() functions (after things like
336 determining the IEEE 1284.3 topology of the port and collecting
337 DeviceIDs). */
338void parport_announce_port (struct parport *port);
339
340/* Unregister a port. */
341extern void parport_remove_port(struct parport *port);
342
343/* Register a new high-level driver. */
344extern int parport_register_driver (struct parport_driver *);
345
346/* Unregister a high-level driver. */
347extern void parport_unregister_driver (struct parport_driver *);
348
349/* If parport_register_driver doesn't fit your needs, perhaps
350 * parport_find_xxx does. */
351extern struct parport *parport_find_number (int);
352extern struct parport *parport_find_base (unsigned long);
353
354/* Reference counting for ports. */
355extern struct parport *parport_get_port (struct parport *);
356extern void parport_put_port (struct parport *);
357
358/* parport_register_device declares that a device is connected to a
359 port, and tells the kernel all it needs to know.
360 - pf is the preemption function (may be NULL for no callback)
361 - kf is the wake-up function (may be NULL for no callback)
362 - irq_func is the interrupt handler (may be NULL for no interrupts)
363 - handle is a user pointer that gets handed to callback functions. */
364struct pardevice *parport_register_device(struct parport *port,
365 const char *name,
366 int (*pf)(void *), void (*kf)(void *),
367 void (*irq_func)(int, void *, struct pt_regs *),
368 int flags, void *handle);
369
370/* parport_unregister unlinks a device from the chain. */
371extern void parport_unregister_device(struct pardevice *dev);
372
373/* parport_claim tries to gain ownership of the port for a particular
374 driver. This may fail (return non-zero) if another driver is busy.
375 If this driver has registered an interrupt handler, it will be
376 enabled. */
377extern int parport_claim(struct pardevice *dev);
378
379/* parport_claim_or_block is the same, but sleeps if the port cannot
380 be claimed. Return value is 1 if it slept, 0 normally and -errno
381 on error. */
382extern int parport_claim_or_block(struct pardevice *dev);
383
384/* parport_release reverses a previous parport_claim. This can never
385 fail, though the effects are undefined (except that they are bad)
386 if you didn't previously own the port. Once you have released the
387 port you should make sure that neither your code nor the hardware
388 on the port tries to initiate any communication without first
389 re-claiming the port. If you mess with the port state (enabling
390 ECP for example) you should clean up before releasing the port. */
391
392extern void parport_release(struct pardevice *dev);
393
394/**
395 * parport_yield - relinquish a parallel port temporarily
396 * @dev: a device on the parallel port
397 *
398 * This function relinquishes the port if it would be helpful to other
399 * drivers to do so. Afterwards it tries to reclaim the port using
400 * parport_claim(), and the return value is the same as for
401 * parport_claim(). If it fails, the port is left unclaimed and it is
402 * the driver's responsibility to reclaim the port.
403 *
404 * The parport_yield() and parport_yield_blocking() functions are for
405 * marking points in the driver at which other drivers may claim the
406 * port and use their devices. Yielding the port is similar to
407 * releasing it and reclaiming it, but is more efficient because no
408 * action is taken if there are no other devices needing the port. In
409 * fact, nothing is done even if there are other devices waiting but
410 * the current device is still within its "timeslice". The default
411 * timeslice is half a second, but it can be adjusted via the /proc
412 * interface.
413 **/
414static __inline__ int parport_yield(struct pardevice *dev)
415{
416 unsigned long int timeslip = (jiffies - dev->time);
417 if ((dev->port->waithead == NULL) || (timeslip < dev->timeslice))
418 return 0;
419 parport_release(dev);
420 return parport_claim(dev);
421}
422
423/**
424 * parport_yield_blocking - relinquish a parallel port temporarily
425 * @dev: a device on the parallel port
426 *
427 * This function relinquishes the port if it would be helpful to other
428 * drivers to do so. Afterwards it tries to reclaim the port using
429 * parport_claim_or_block(), and the return value is the same as for
430 * parport_claim_or_block().
431 **/
432static __inline__ int parport_yield_blocking(struct pardevice *dev)
433{
434 unsigned long int timeslip = (jiffies - dev->time);
435 if ((dev->port->waithead == NULL) || (timeslip < dev->timeslice))
436 return 0;
437 parport_release(dev);
438 return parport_claim_or_block(dev);
439}
440
441/* Flags used to identify what a device does. */
442#define PARPORT_DEV_TRAN 0 /* WARNING !! DEPRECATED !! */
443#define PARPORT_DEV_LURK (1<<0) /* WARNING !! DEPRECATED !! */
444#define PARPORT_DEV_EXCL (1<<1) /* Need exclusive access. */
445
446#define PARPORT_FLAG_EXCL (1<<1) /* EXCL driver registered. */
447
448/* IEEE1284 functions */
449extern void parport_ieee1284_interrupt (int, void *, struct pt_regs *);
450extern int parport_negotiate (struct parport *, int mode);
451extern ssize_t parport_write (struct parport *, const void *buf, size_t len);
452extern ssize_t parport_read (struct parport *, void *buf, size_t len);
453
454#define PARPORT_INACTIVITY_O_NONBLOCK 1
455extern long parport_set_timeout (struct pardevice *, long inactivity);
456
457extern int parport_wait_event (struct parport *, long timeout);
458extern int parport_wait_peripheral (struct parport *port,
459 unsigned char mask,
460 unsigned char val);
461extern int parport_poll_peripheral (struct parport *port,
462 unsigned char mask,
463 unsigned char val,
464 int usec);
465
466/* For architectural drivers */
467extern size_t parport_ieee1284_write_compat (struct parport *,
468 const void *, size_t, int);
469extern size_t parport_ieee1284_read_nibble (struct parport *,
470 void *, size_t, int);
471extern size_t parport_ieee1284_read_byte (struct parport *,
472 void *, size_t, int);
473extern size_t parport_ieee1284_ecp_read_data (struct parport *,
474 void *, size_t, int);
475extern size_t parport_ieee1284_ecp_write_data (struct parport *,
476 const void *, size_t, int);
477extern size_t parport_ieee1284_ecp_write_addr (struct parport *,
478 const void *, size_t, int);
479extern size_t parport_ieee1284_epp_write_data (struct parport *,
480 const void *, size_t, int);
481extern size_t parport_ieee1284_epp_read_data (struct parport *,
482 void *, size_t, int);
483extern size_t parport_ieee1284_epp_write_addr (struct parport *,
484 const void *, size_t, int);
485extern size_t parport_ieee1284_epp_read_addr (struct parport *,
486 void *, size_t, int);
487
488/* IEEE1284.3 functions */
489extern int parport_daisy_init (struct parport *port);
490extern void parport_daisy_fini (struct parport *port);
491extern struct pardevice *parport_open (int devnum, const char *name,
492 int (*pf) (void *),
493 void (*kf) (void *),
494 void (*irqf) (int, void *,
495 struct pt_regs *),
496 int flags, void *handle);
497extern void parport_close (struct pardevice *dev);
498extern ssize_t parport_device_id (int devnum, char *buffer, size_t len);
499extern int parport_device_num (int parport, int mux, int daisy);
500extern void parport_daisy_deselect_all (struct parport *port);
501extern int parport_daisy_select (struct parport *port, int daisy, int mode);
502
503/* Lowlevel drivers _can_ call this support function to handle irqs. */
504static __inline__ void parport_generic_irq(int irq, struct parport *port,
505 struct pt_regs *regs)
506{
507 parport_ieee1284_interrupt (irq, port, regs);
508 read_lock(&port->cad_lock);
509 if (port->cad && port->cad->irq_func)
510 port->cad->irq_func(irq, port->cad->private, regs);
511 read_unlock(&port->cad_lock);
512}
513
514/* Prototypes from parport_procfs */
515extern int parport_proc_register(struct parport *pp);
516extern int parport_proc_unregister(struct parport *pp);
517extern int parport_device_proc_register(struct pardevice *device);
518extern int parport_device_proc_unregister(struct pardevice *device);
519
520/* If PC hardware is the only type supported, we can optimise a bit. */
521#if !defined(CONFIG_PARPORT_NOT_PC)
522
523#include <linux/parport_pc.h>
524#define parport_write_data(p,x) parport_pc_write_data(p,x)
525#define parport_read_data(p) parport_pc_read_data(p)
526#define parport_write_control(p,x) parport_pc_write_control(p,x)
527#define parport_read_control(p) parport_pc_read_control(p)
528#define parport_frob_control(p,m,v) parport_pc_frob_control(p,m,v)
529#define parport_read_status(p) parport_pc_read_status(p)
530#define parport_enable_irq(p) parport_pc_enable_irq(p)
531#define parport_disable_irq(p) parport_pc_disable_irq(p)
532#define parport_data_forward(p) parport_pc_data_forward(p)
533#define parport_data_reverse(p) parport_pc_data_reverse(p)
534
535#else /* !CONFIG_PARPORT_NOT_PC */
536
537/* Generic operations vector through the dispatch table. */
538#define parport_write_data(p,x) (p)->ops->write_data(p,x)
539#define parport_read_data(p) (p)->ops->read_data(p)
540#define parport_write_control(p,x) (p)->ops->write_control(p,x)
541#define parport_read_control(p) (p)->ops->read_control(p)
542#define parport_frob_control(p,m,v) (p)->ops->frob_control(p,m,v)
543#define parport_read_status(p) (p)->ops->read_status(p)
544#define parport_enable_irq(p) (p)->ops->enable_irq(p)
545#define parport_disable_irq(p) (p)->ops->disable_irq(p)
546#define parport_data_forward(p) (p)->ops->data_forward(p)
547#define parport_data_reverse(p) (p)->ops->data_reverse(p)
548
549#endif /* !CONFIG_PARPORT_NOT_PC */
550
551#endif /* __KERNEL__ */
552#endif /* _PARPORT_H_ */
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