2 * Low-level parallel-support for PC-style hardware integrated in the
3 * LASI-Controller (on GSC-Bus) for HP-PARISC Workstations
5 * This program is free software; you can redistribute it and/or modify
6 * it under the terms of the GNU General Public License as published by
7 * the Free Software Foundation; either version 2 of the License, or
8 * (at your option) any later version.
10 * (C) 1999-2001 by Helge Deller <deller@gmx.de>
13 * based on parport_pc.c by
14 * Grant Guenther <grant@torque.net>
15 * Phil Blundell <Philip.Blundell@pobox.com>
16 * Tim Waugh <tim@cyberelk.demon.co.uk>
17 * Jose Renau <renau@acm.org>
18 * David Campbell <campbell@torque.net>
22 #undef DEBUG /* undef for production */
24 #include <linux/module.h>
25 #include <linux/init.h>
26 #include <linux/sched.h>
27 #include <linux/delay.h>
28 #include <linux/errno.h>
29 #include <linux/interrupt.h>
30 #include <linux/ioport.h>
31 #include <linux/kernel.h>
32 #include <linux/slab.h>
33 #include <linux/pci.h>
34 #include <linux/sysctl.h>
38 #include <asm/uaccess.h>
39 #include <asm/superio.h>
41 #include <linux/parport.h>
43 #include <asm/parisc-device.h>
44 #include <asm/hardware.h>
45 #include <asm/parport_gsc.h>
48 MODULE_AUTHOR("Helge Deller <deller@gmx.de>");
49 MODULE_DESCRIPTION("HP-PARISC PC-style parallel port driver");
50 MODULE_SUPPORTED_DEVICE("integrated PC-style parallel port");
51 MODULE_LICENSE("GPL");
55 * Clear TIMEOUT BIT in EPP MODE
57 * This is also used in SPP detection.
59 static int clear_epp_timeout(struct parport
*pb
)
63 if (!(parport_gsc_read_status(pb
) & 0x01))
66 /* To clear timeout some chips require double read */
67 parport_gsc_read_status(pb
);
68 r
= parport_gsc_read_status(pb
);
69 parport_writeb (r
| 0x01, STATUS (pb
)); /* Some reset by writing 1 */
70 parport_writeb (r
& 0xfe, STATUS (pb
)); /* Others by writing 0 */
71 r
= parport_gsc_read_status(pb
);
79 * Most of these aren't static because they may be used by the
80 * parport_xxx_yyy macros. extern __inline__ versions of several
81 * of these are in parport_gsc.h.
84 static irqreturn_t
parport_gsc_interrupt(int irq
, void *dev_id
, struct pt_regs
*regs
)
86 parport_generic_irq(irq
, (struct parport
*) dev_id
, regs
);
90 void parport_gsc_write_data(struct parport
*p
, unsigned char d
)
92 parport_writeb (d
, DATA (p
));
95 unsigned char parport_gsc_read_data(struct parport
*p
)
97 unsigned char c
= parport_readb (DATA (p
));
101 void parport_gsc_write_control(struct parport
*p
, unsigned char d
)
103 const unsigned char wm
= (PARPORT_CONTROL_STROBE
|
104 PARPORT_CONTROL_AUTOFD
|
105 PARPORT_CONTROL_INIT
|
106 PARPORT_CONTROL_SELECT
);
108 /* Take this out when drivers have adapted to the newer interface. */
110 pr_debug("%s (%s): use data_reverse for this!\n",
111 p
->name
, p
->cad
->name
);
112 parport_gsc_data_reverse (p
);
115 __parport_gsc_frob_control (p
, wm
, d
& wm
);
118 unsigned char parport_gsc_read_control(struct parport
*p
)
120 const unsigned char wm
= (PARPORT_CONTROL_STROBE
|
121 PARPORT_CONTROL_AUTOFD
|
122 PARPORT_CONTROL_INIT
|
123 PARPORT_CONTROL_SELECT
);
124 const struct parport_gsc_private
*priv
= p
->physport
->private_data
;
125 return priv
->ctr
& wm
; /* Use soft copy */
128 unsigned char parport_gsc_frob_control (struct parport
*p
, unsigned char mask
,
131 const unsigned char wm
= (PARPORT_CONTROL_STROBE
|
132 PARPORT_CONTROL_AUTOFD
|
133 PARPORT_CONTROL_INIT
|
134 PARPORT_CONTROL_SELECT
);
136 /* Take this out when drivers have adapted to the newer interface. */
138 pr_debug("%s (%s): use data_%s for this!\n",
139 p
->name
, p
->cad
->name
,
140 (val
& 0x20) ? "reverse" : "forward");
142 parport_gsc_data_reverse (p
);
144 parport_gsc_data_forward (p
);
147 /* Restrict mask and val to control lines. */
151 return __parport_gsc_frob_control (p
, mask
, val
);
154 unsigned char parport_gsc_read_status(struct parport
*p
)
156 return parport_readb (STATUS (p
));
159 void parport_gsc_disable_irq(struct parport
*p
)
161 __parport_gsc_frob_control (p
, 0x10, 0);
164 void parport_gsc_enable_irq(struct parport
*p
)
166 __parport_gsc_frob_control (p
, 0x10, 0x10);
169 void parport_gsc_data_forward (struct parport
*p
)
171 __parport_gsc_frob_control (p
, 0x20, 0);
174 void parport_gsc_data_reverse (struct parport
*p
)
176 __parport_gsc_frob_control (p
, 0x20, 0x20);
179 void parport_gsc_init_state(struct pardevice
*dev
, struct parport_state
*s
)
181 s
->u
.pc
.ctr
= 0xc | (dev
->irq_func
? 0x10 : 0x0);
184 void parport_gsc_save_state(struct parport
*p
, struct parport_state
*s
)
186 s
->u
.pc
.ctr
= parport_readb (CONTROL (p
));
189 void parport_gsc_restore_state(struct parport
*p
, struct parport_state
*s
)
191 parport_writeb (s
->u
.pc
.ctr
, CONTROL (p
));
194 struct parport_operations parport_gsc_ops
=
196 .write_data
= parport_gsc_write_data
,
197 .read_data
= parport_gsc_read_data
,
199 .write_control
= parport_gsc_write_control
,
200 .read_control
= parport_gsc_read_control
,
201 .frob_control
= parport_gsc_frob_control
,
203 .read_status
= parport_gsc_read_status
,
205 .enable_irq
= parport_gsc_enable_irq
,
206 .disable_irq
= parport_gsc_disable_irq
,
208 .data_forward
= parport_gsc_data_forward
,
209 .data_reverse
= parport_gsc_data_reverse
,
211 .init_state
= parport_gsc_init_state
,
212 .save_state
= parport_gsc_save_state
,
213 .restore_state
= parport_gsc_restore_state
,
215 .epp_write_data
= parport_ieee1284_epp_write_data
,
216 .epp_read_data
= parport_ieee1284_epp_read_data
,
217 .epp_write_addr
= parport_ieee1284_epp_write_addr
,
218 .epp_read_addr
= parport_ieee1284_epp_read_addr
,
220 .ecp_write_data
= parport_ieee1284_ecp_write_data
,
221 .ecp_read_data
= parport_ieee1284_ecp_read_data
,
222 .ecp_write_addr
= parport_ieee1284_ecp_write_addr
,
224 .compat_write_data
= parport_ieee1284_write_compat
,
225 .nibble_read_data
= parport_ieee1284_read_nibble
,
226 .byte_read_data
= parport_ieee1284_read_byte
,
228 .owner
= THIS_MODULE
,
231 /* --- Mode detection ------------------------------------- */
234 * Checks for port existence, all ports support SPP MODE
236 static int __devinit
parport_SPP_supported(struct parport
*pb
)
241 * first clear an eventually pending EPP timeout
242 * I (sailer@ife.ee.ethz.ch) have an SMSC chipset
243 * that does not even respond to SPP cycles if an EPP
246 clear_epp_timeout(pb
);
248 /* Do a simple read-write test to make sure the port exists. */
250 parport_writeb (w
, CONTROL (pb
));
252 /* Is there a control register that we can read from? Some
253 * ports don't allow reads, so read_control just returns a
254 * software copy. Some ports _do_ allow reads, so bypass the
255 * software copy here. In addition, some bits aren't
257 r
= parport_readb (CONTROL (pb
));
258 if ((r
& 0xf) == w
) {
260 parport_writeb (w
, CONTROL (pb
));
261 r
= parport_readb (CONTROL (pb
));
262 parport_writeb (0xc, CONTROL (pb
));
264 return PARPORT_MODE_PCSPP
;
267 /* Try the data register. The data lines aren't tri-stated at
268 * this stage, so we expect back what we wrote. */
270 parport_gsc_write_data (pb
, w
);
271 r
= parport_gsc_read_data (pb
);
274 parport_gsc_write_data (pb
, w
);
275 r
= parport_gsc_read_data (pb
);
277 return PARPORT_MODE_PCSPP
;
283 /* Detect PS/2 support.
285 * Bit 5 (0x20) sets the PS/2 data direction; setting this high
286 * allows us to read data from the data lines. In theory we would get back
287 * 0xff but any peripheral attached to the port may drag some or all of the
288 * lines down to zero. So if we get back anything that isn't the contents
289 * of the data register we deem PS/2 support to be present.
291 * Some SPP ports have "half PS/2" ability - you can't turn off the line
292 * drivers, but an external peripheral with sufficiently beefy drivers of
293 * its own can overpower them and assert its own levels onto the bus, from
294 * where they can then be read back as normal. Ports with this property
295 * and the right type of device attached are likely to fail the SPP test,
296 * (as they will appear to have stuck bits) and so the fact that they might
297 * be misdetected here is rather academic.
300 static int __devinit
parport_PS2_supported(struct parport
*pb
)
304 clear_epp_timeout(pb
);
306 /* try to tri-state the buffer */
307 parport_gsc_data_reverse (pb
);
309 parport_gsc_write_data(pb
, 0x55);
310 if (parport_gsc_read_data(pb
) != 0x55) ok
++;
312 parport_gsc_write_data(pb
, 0xaa);
313 if (parport_gsc_read_data(pb
) != 0xaa) ok
++;
315 /* cancel input mode */
316 parport_gsc_data_forward (pb
);
319 pb
->modes
|= PARPORT_MODE_TRISTATE
;
321 struct parport_gsc_private
*priv
= pb
->private_data
;
322 priv
->ctr_writable
&= ~0x20;
329 /* --- Initialisation code -------------------------------- */
331 struct parport
*__devinit
parport_gsc_probe_port (unsigned long base
,
332 unsigned long base_hi
,
336 struct parport_gsc_private
*priv
;
337 struct parport_operations
*ops
;
339 struct parport
*p
= &tmp
;
341 priv
= kmalloc (sizeof (struct parport_gsc_private
), GFP_KERNEL
);
343 printk (KERN_DEBUG
"parport (0x%lx): no memory!\n", base
);
346 ops
= kmalloc (sizeof (struct parport_operations
), GFP_KERNEL
);
348 printk (KERN_DEBUG
"parport (0x%lx): no memory for ops!\n",
353 memcpy (ops
, &parport_gsc_ops
, sizeof (struct parport_operations
));
355 priv
->ctr_writable
= 0xff;
357 priv
->dma_handle
= 0;
360 p
->base_hi
= base_hi
;
363 p
->modes
= PARPORT_MODE_PCSPP
| PARPORT_MODE_SAFEININT
;
365 p
->private_data
= priv
;
367 if (!parport_SPP_supported (p
)) {
372 parport_PS2_supported (p
);
374 if (!(p
= parport_register_port(base
, PARPORT_IRQ_NONE
,
375 PARPORT_DMA_NONE
, ops
))) {
381 p
->base_hi
= base_hi
;
382 p
->modes
= tmp
.modes
;
383 p
->size
= (p
->modes
& PARPORT_MODE_EPP
)?8:3;
384 p
->private_data
= priv
;
386 printk(KERN_INFO
"%s: PC-style at 0x%lx", p
->name
, p
->base
);
388 if (p
->irq
== PARPORT_IRQ_AUTO
) {
389 p
->irq
= PARPORT_IRQ_NONE
;
391 if (p
->irq
!= PARPORT_IRQ_NONE
) {
392 printk(", irq %d", p
->irq
);
394 if (p
->dma
== PARPORT_DMA_AUTO
) {
395 p
->dma
= PARPORT_DMA_NONE
;
398 if (p
->dma
== PARPORT_DMA_AUTO
) /* To use DMA, giving the irq
399 is mandatory (see above) */
400 p
->dma
= PARPORT_DMA_NONE
;
403 #define printmode(x) {if(p->modes&PARPORT_MODE_##x){printk("%s%s",f?",":"",#x);f++;}}
416 if (p
->irq
!= PARPORT_IRQ_NONE
) {
417 if (request_irq (p
->irq
, parport_gsc_interrupt
,
419 printk (KERN_WARNING
"%s: irq %d in use, "
420 "resorting to polled operation\n",
422 p
->irq
= PARPORT_IRQ_NONE
;
423 p
->dma
= PARPORT_DMA_NONE
;
427 /* Done probing. Now put the port into a sensible start-up state. */
429 parport_gsc_write_data(p
, 0);
430 parport_gsc_data_forward (p
);
432 /* Now that we've told the sharing engine about the port, and
433 found out its characteristics, let the high-level drivers
435 parport_announce_port (p
);
441 #define PARPORT_GSC_OFFSET 0x800
443 static int __initdata parport_count
;
445 static int __devinit
parport_init_chip(struct parisc_device
*dev
)
451 printk("IRQ not found for parallel device at 0x%lx\n", dev
->hpa
);
455 port
= dev
->hpa
+ PARPORT_GSC_OFFSET
;
457 /* some older machines with ASP-chip don't support
458 * the enhanced parport modes.
460 if (boot_cpu_data
.cpu_type
> pcxt
&& !pdc_add_valid(port
+4)) {
462 /* Initialize bidirectional-mode (0x10) & data-tranfer-mode #1 (0x20) */
463 printk("%s: initialize bidirectional-mode.\n", __FUNCTION__
);
464 parport_writeb ( (0x10 + 0x20), port
+ 4);
467 printk("%s: enhanced parport-modes not supported.\n", __FUNCTION__
);
470 p
= parport_gsc_probe_port(port
, 0, dev
->irq
,
471 /* PARPORT_IRQ_NONE */ PARPORT_DMA_NONE
, NULL
);
474 dev
->dev
.driver_data
= p
;
479 static int __devexit
parport_remove_chip(struct parisc_device
*dev
)
481 struct parport
*p
= dev
->dev
.driver_data
;
483 struct parport_gsc_private
*priv
= p
->private_data
;
484 struct parport_operations
*ops
= p
->ops
;
485 parport_remove_port(p
);
486 if (p
->dma
!= PARPORT_DMA_NONE
)
488 if (p
->irq
!= PARPORT_IRQ_NONE
)
491 pci_free_consistent(priv
->dev
, PAGE_SIZE
,
494 kfree (p
->private_data
);
496 kfree (ops
); /* hope no-one cached it */
501 static struct parisc_device_id parport_tbl
[] = {
502 { HPHW_FIO
, HVERSION_REV_ANY_ID
, HVERSION_ANY_ID
, 0x74 },
506 MODULE_DEVICE_TABLE(parisc
, parport_tbl
);
508 static struct parisc_driver parport_driver
= {
510 .id_table
= parport_tbl
,
511 .probe
= parport_init_chip
,
512 .remove
= __devexit_p(parport_remove_chip
),
515 int __devinit
parport_gsc_init(void)
517 return register_parisc_driver(&parport_driver
);
520 static void __devexit
parport_gsc_exit(void)
522 unregister_parisc_driver(&parport_driver
);
525 module_init(parport_gsc_init
);
526 module_exit(parport_gsc_exit
);