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Linux/drivers/parport/parport_gsc.c

  1 /*
  2  *      Low-level parallel-support for PC-style hardware integrated in the 
  3  *      LASI-Controller (on GSC-Bus) for HP-PARISC Workstations
  4  *
  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.
  9  *
 10  *      (C) 1999-2001 by Helge Deller <deller@gmx.de>
 11  *
 12  * 
 13  * based on parport_pc.c by 
 14  *          Grant Guenther <grant@torque.net>
 15  *          Phil Blundell <philb@gnu.org>
 16  *          Tim Waugh <tim@cyberelk.demon.co.uk>
 17  *          Jose Renau <renau@acm.org>
 18  *          David Campbell
 19  *          Andrea Arcangeli
 20  */
 21 
 22 #undef DEBUG    /* undef for production */
 23 
 24 #include <linux/module.h>
 25 #include <linux/init.h>
 26 #include <linux/delay.h>
 27 #include <linux/errno.h>
 28 #include <linux/interrupt.h>
 29 #include <linux/ioport.h>
 30 #include <linux/kernel.h>
 31 #include <linux/slab.h>
 32 #include <linux/pci.h>
 33 #include <linux/sysctl.h>
 34 
 35 #include <asm/io.h>
 36 #include <asm/dma.h>
 37 #include <asm/uaccess.h>
 38 #include <asm/superio.h>
 39 
 40 #include <linux/parport.h>
 41 #include <asm/pdc.h>
 42 #include <asm/parisc-device.h>
 43 #include <asm/hardware.h>
 44 #include "parport_gsc.h"
 45 
 46 
 47 MODULE_AUTHOR("Helge Deller <deller@gmx.de>");
 48 MODULE_DESCRIPTION("HP-PARISC PC-style parallel port driver");
 49 MODULE_SUPPORTED_DEVICE("integrated PC-style parallel port");
 50 MODULE_LICENSE("GPL");
 51 
 52 
 53 /*
 54  * Clear TIMEOUT BIT in EPP MODE
 55  *
 56  * This is also used in SPP detection.
 57  */
 58 static int clear_epp_timeout(struct parport *pb)
 59 {
 60         unsigned char r;
 61 
 62         if (!(parport_gsc_read_status(pb) & 0x01))
 63                 return 1;
 64 
 65         /* To clear timeout some chips require double read */
 66         parport_gsc_read_status(pb);
 67         r = parport_gsc_read_status(pb);
 68         parport_writeb (r | 0x01, STATUS (pb)); /* Some reset by writing 1 */
 69         parport_writeb (r & 0xfe, STATUS (pb)); /* Others by writing 0 */
 70         r = parport_gsc_read_status(pb);
 71 
 72         return !(r & 0x01);
 73 }
 74 
 75 /*
 76  * Access functions.
 77  *
 78  * Most of these aren't static because they may be used by the
 79  * parport_xxx_yyy macros.  extern __inline__ versions of several
 80  * of these are in parport_gsc.h.
 81  */
 82 
 83 void parport_gsc_init_state(struct pardevice *dev, struct parport_state *s)
 84 {
 85         s->u.pc.ctr = 0xc | (dev->irq_func ? 0x10 : 0x0);
 86 }
 87 
 88 void parport_gsc_save_state(struct parport *p, struct parport_state *s)
 89 {
 90         s->u.pc.ctr = parport_readb (CONTROL (p));
 91 }
 92 
 93 void parport_gsc_restore_state(struct parport *p, struct parport_state *s)
 94 {
 95         parport_writeb (s->u.pc.ctr, CONTROL (p));
 96 }
 97 
 98 struct parport_operations parport_gsc_ops = 
 99 {
100         .write_data     = parport_gsc_write_data,
101         .read_data      = parport_gsc_read_data,
102 
103         .write_control  = parport_gsc_write_control,
104         .read_control   = parport_gsc_read_control,
105         .frob_control   = parport_gsc_frob_control,
106 
107         .read_status    = parport_gsc_read_status,
108 
109         .enable_irq     = parport_gsc_enable_irq,
110         .disable_irq    = parport_gsc_disable_irq,
111 
112         .data_forward   = parport_gsc_data_forward,
113         .data_reverse   = parport_gsc_data_reverse,
114 
115         .init_state     = parport_gsc_init_state,
116         .save_state     = parport_gsc_save_state,
117         .restore_state  = parport_gsc_restore_state,
118 
119         .epp_write_data = parport_ieee1284_epp_write_data,
120         .epp_read_data  = parport_ieee1284_epp_read_data,
121         .epp_write_addr = parport_ieee1284_epp_write_addr,
122         .epp_read_addr  = parport_ieee1284_epp_read_addr,
123 
124         .ecp_write_data = parport_ieee1284_ecp_write_data,
125         .ecp_read_data  = parport_ieee1284_ecp_read_data,
126         .ecp_write_addr = parport_ieee1284_ecp_write_addr,
127 
128         .compat_write_data      = parport_ieee1284_write_compat,
129         .nibble_read_data       = parport_ieee1284_read_nibble,
130         .byte_read_data         = parport_ieee1284_read_byte,
131 
132         .owner          = THIS_MODULE,
133 };
134 
135 /* --- Mode detection ------------------------------------- */
136 
137 /*
138  * Checks for port existence, all ports support SPP MODE
139  */
140 static int parport_SPP_supported(struct parport *pb)
141 {
142         unsigned char r, w;
143 
144         /*
145          * first clear an eventually pending EPP timeout 
146          * I (sailer@ife.ee.ethz.ch) have an SMSC chipset
147          * that does not even respond to SPP cycles if an EPP
148          * timeout is pending
149          */
150         clear_epp_timeout(pb);
151 
152         /* Do a simple read-write test to make sure the port exists. */
153         w = 0xc;
154         parport_writeb (w, CONTROL (pb));
155 
156         /* Is there a control register that we can read from?  Some
157          * ports don't allow reads, so read_control just returns a
158          * software copy. Some ports _do_ allow reads, so bypass the
159          * software copy here.  In addition, some bits aren't
160          * writable. */
161         r = parport_readb (CONTROL (pb));
162         if ((r & 0xf) == w) {
163                 w = 0xe;
164                 parport_writeb (w, CONTROL (pb));
165                 r = parport_readb (CONTROL (pb));
166                 parport_writeb (0xc, CONTROL (pb));
167                 if ((r & 0xf) == w)
168                         return PARPORT_MODE_PCSPP;
169         }
170 
171         /* Try the data register.  The data lines aren't tri-stated at
172          * this stage, so we expect back what we wrote. */
173         w = 0xaa;
174         parport_gsc_write_data (pb, w);
175         r = parport_gsc_read_data (pb);
176         if (r == w) {
177                 w = 0x55;
178                 parport_gsc_write_data (pb, w);
179                 r = parport_gsc_read_data (pb);
180                 if (r == w)
181                         return PARPORT_MODE_PCSPP;
182         }
183 
184         return 0;
185 }
186 
187 /* Detect PS/2 support.
188  *
189  * Bit 5 (0x20) sets the PS/2 data direction; setting this high
190  * allows us to read data from the data lines.  In theory we would get back
191  * 0xff but any peripheral attached to the port may drag some or all of the
192  * lines down to zero.  So if we get back anything that isn't the contents
193  * of the data register we deem PS/2 support to be present. 
194  *
195  * Some SPP ports have "half PS/2" ability - you can't turn off the line
196  * drivers, but an external peripheral with sufficiently beefy drivers of
197  * its own can overpower them and assert its own levels onto the bus, from
198  * where they can then be read back as normal.  Ports with this property
199  * and the right type of device attached are likely to fail the SPP test,
200  * (as they will appear to have stuck bits) and so the fact that they might
201  * be misdetected here is rather academic. 
202  */
203 
204 static int parport_PS2_supported(struct parport *pb)
205 {
206         int ok = 0;
207   
208         clear_epp_timeout(pb);
209 
210         /* try to tri-state the buffer */
211         parport_gsc_data_reverse (pb);
212         
213         parport_gsc_write_data(pb, 0x55);
214         if (parport_gsc_read_data(pb) != 0x55) ok++;
215 
216         parport_gsc_write_data(pb, 0xaa);
217         if (parport_gsc_read_data(pb) != 0xaa) ok++;
218 
219         /* cancel input mode */
220         parport_gsc_data_forward (pb);
221 
222         if (ok) {
223                 pb->modes |= PARPORT_MODE_TRISTATE;
224         } else {
225                 struct parport_gsc_private *priv = pb->private_data;
226                 priv->ctr_writable &= ~0x20;
227         }
228 
229         return ok;
230 }
231 
232 
233 /* --- Initialisation code -------------------------------- */
234 
235 struct parport *parport_gsc_probe_port(unsigned long base,
236                                        unsigned long base_hi, int irq,
237                                        int dma, struct parisc_device *padev)
238 {
239         struct parport_gsc_private *priv;
240         struct parport_operations *ops;
241         struct parport tmp;
242         struct parport *p = &tmp;
243 
244         priv = kzalloc (sizeof (struct parport_gsc_private), GFP_KERNEL);
245         if (!priv) {
246                 printk (KERN_DEBUG "parport (0x%lx): no memory!\n", base);
247                 return NULL;
248         }
249         ops = kmemdup(&parport_gsc_ops, sizeof(struct parport_operations),
250                       GFP_KERNEL);
251         if (!ops) {
252                 printk (KERN_DEBUG "parport (0x%lx): no memory for ops!\n",
253                         base);
254                 kfree (priv);
255                 return NULL;
256         }
257         priv->ctr = 0xc;
258         priv->ctr_writable = 0xff;
259         priv->dma_buf = 0;
260         priv->dma_handle = 0;
261         p->base = base;
262         p->base_hi = base_hi;
263         p->irq = irq;
264         p->dma = dma;
265         p->modes = PARPORT_MODE_PCSPP | PARPORT_MODE_SAFEININT;
266         p->ops = ops;
267         p->private_data = priv;
268         p->physport = p;
269         if (!parport_SPP_supported (p)) {
270                 /* No port. */
271                 kfree (priv);
272                 kfree(ops);
273                 return NULL;
274         }
275         parport_PS2_supported (p);
276 
277         if (!(p = parport_register_port(base, PARPORT_IRQ_NONE,
278                                         PARPORT_DMA_NONE, ops))) {
279                 kfree (priv);
280                 kfree (ops);
281                 return NULL;
282         }
283 
284         p->dev = &padev->dev;
285         p->base_hi = base_hi;
286         p->modes = tmp.modes;
287         p->size = (p->modes & PARPORT_MODE_EPP)?8:3;
288         p->private_data = priv;
289 
290         printk(KERN_INFO "%s: PC-style at 0x%lx", p->name, p->base);
291         p->irq = irq;
292         if (p->irq == PARPORT_IRQ_AUTO) {
293                 p->irq = PARPORT_IRQ_NONE;
294         }
295         if (p->irq != PARPORT_IRQ_NONE) {
296                 printk(", irq %d", p->irq);
297 
298                 if (p->dma == PARPORT_DMA_AUTO) {
299                         p->dma = PARPORT_DMA_NONE;
300                 }
301         }
302         if (p->dma == PARPORT_DMA_AUTO) /* To use DMA, giving the irq
303                                            is mandatory (see above) */
304                 p->dma = PARPORT_DMA_NONE;
305 
306         printk(" [");
307 #define printmode(x) {if(p->modes&PARPORT_MODE_##x){printk("%s%s",f?",":"",#x);f++;}}
308         {
309                 int f = 0;
310                 printmode(PCSPP);
311                 printmode(TRISTATE);
312                 printmode(COMPAT)
313                 printmode(EPP);
314 //              printmode(ECP);
315 //              printmode(DMA);
316         }
317 #undef printmode
318         printk("]\n");
319 
320         if (p->irq != PARPORT_IRQ_NONE) {
321                 if (request_irq (p->irq, parport_irq_handler,
322                                  0, p->name, p)) {
323                         printk (KERN_WARNING "%s: irq %d in use, "
324                                 "resorting to polled operation\n",
325                                 p->name, p->irq);
326                         p->irq = PARPORT_IRQ_NONE;
327                         p->dma = PARPORT_DMA_NONE;
328                 }
329         }
330 
331         /* Done probing.  Now put the port into a sensible start-up state. */
332 
333         parport_gsc_write_data(p, 0);
334         parport_gsc_data_forward (p);
335 
336         /* Now that we've told the sharing engine about the port, and
337            found out its characteristics, let the high-level drivers
338            know about it. */
339         parport_announce_port (p);
340 
341         return p;
342 }
343 
344 
345 #define PARPORT_GSC_OFFSET 0x800
346 
347 static int parport_count;
348 
349 static int parport_init_chip(struct parisc_device *dev)
350 {
351         struct parport *p;
352         unsigned long port;
353 
354         if (!dev->irq) {
355                 printk(KERN_WARNING "IRQ not found for parallel device at 0x%llx\n",
356                         (unsigned long long)dev->hpa.start);
357                 return -ENODEV;
358         }
359 
360         port = dev->hpa.start + PARPORT_GSC_OFFSET;
361         
362         /* some older machines with ASP-chip don't support
363          * the enhanced parport modes.
364          */
365         if (boot_cpu_data.cpu_type > pcxt && !pdc_add_valid(port+4)) {
366 
367                 /* Initialize bidirectional-mode (0x10) & data-tranfer-mode #1 (0x20) */
368                 printk("%s: initialize bidirectional-mode.\n", __func__);
369                 parport_writeb ( (0x10 + 0x20), port + 4);
370 
371         } else {
372                 printk("%s: enhanced parport-modes not supported.\n", __func__);
373         }
374         
375         p = parport_gsc_probe_port(port, 0, dev->irq,
376                         /* PARPORT_IRQ_NONE */ PARPORT_DMA_NONE, dev);
377         if (p)
378                 parport_count++;
379         dev_set_drvdata(&dev->dev, p);
380 
381         return 0;
382 }
383 
384 static int parport_remove_chip(struct parisc_device *dev)
385 {
386         struct parport *p = dev_get_drvdata(&dev->dev);
387         if (p) {
388                 struct parport_gsc_private *priv = p->private_data;
389                 struct parport_operations *ops = p->ops;
390                 parport_remove_port(p);
391                 if (p->dma != PARPORT_DMA_NONE)
392                         free_dma(p->dma);
393                 if (p->irq != PARPORT_IRQ_NONE)
394                         free_irq(p->irq, p);
395                 if (priv->dma_buf)
396                         pci_free_consistent(priv->dev, PAGE_SIZE,
397                                             priv->dma_buf,
398                                             priv->dma_handle);
399                 kfree (p->private_data);
400                 parport_put_port(p);
401                 kfree (ops); /* hope no-one cached it */
402         }
403         return 0;
404 }
405 
406 static struct parisc_device_id parport_tbl[] = {
407         { HPHW_FIO, HVERSION_REV_ANY_ID, HVERSION_ANY_ID, 0x74 },
408         { 0, }
409 };
410 
411 MODULE_DEVICE_TABLE(parisc, parport_tbl);
412 
413 static struct parisc_driver parport_driver = {
414         .name           = "Parallel",
415         .id_table       = parport_tbl,
416         .probe          = parport_init_chip,
417         .remove         = parport_remove_chip,
418 };
419 
420 int parport_gsc_init(void)
421 {
422         return register_parisc_driver(&parport_driver);
423 }
424 
425 static void parport_gsc_exit(void)
426 {
427         unregister_parisc_driver(&parport_driver);
428 }
429 
430 module_init(parport_gsc_init);
431 module_exit(parport_gsc_exit);
432 

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