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1da177e4 LT |
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> | |
bdca3f20 | 18 | * David Campbell |
1da177e4 LT |
19 | * Andrea Arcangeli |
20 | */ | |
21 | ||
22 | #undef DEBUG /* undef for production */ | |
23 | ||
24 | #include <linux/module.h> | |
25 | #include <linux/init.h> | |
1da177e4 LT |
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 | ||
7d12e780 | 83 | static irqreturn_t parport_gsc_interrupt(int irq, void *dev_id) |
1da177e4 | 84 | { |
7d12e780 | 85 | parport_generic_irq(irq, (struct parport *) dev_id); |
1da177e4 LT |
86 | return IRQ_HANDLED; |
87 | } | |
88 | ||
89 | void parport_gsc_init_state(struct pardevice *dev, struct parport_state *s) | |
90 | { | |
91 | s->u.pc.ctr = 0xc | (dev->irq_func ? 0x10 : 0x0); | |
92 | } | |
93 | ||
94 | void parport_gsc_save_state(struct parport *p, struct parport_state *s) | |
95 | { | |
96 | s->u.pc.ctr = parport_readb (CONTROL (p)); | |
97 | } | |
98 | ||
99 | void parport_gsc_restore_state(struct parport *p, struct parport_state *s) | |
100 | { | |
101 | parport_writeb (s->u.pc.ctr, CONTROL (p)); | |
102 | } | |
103 | ||
104 | struct parport_operations parport_gsc_ops = | |
105 | { | |
106 | .write_data = parport_gsc_write_data, | |
107 | .read_data = parport_gsc_read_data, | |
108 | ||
109 | .write_control = parport_gsc_write_control, | |
110 | .read_control = parport_gsc_read_control, | |
111 | .frob_control = parport_gsc_frob_control, | |
112 | ||
113 | .read_status = parport_gsc_read_status, | |
114 | ||
115 | .enable_irq = parport_gsc_enable_irq, | |
116 | .disable_irq = parport_gsc_disable_irq, | |
117 | ||
118 | .data_forward = parport_gsc_data_forward, | |
119 | .data_reverse = parport_gsc_data_reverse, | |
120 | ||
121 | .init_state = parport_gsc_init_state, | |
122 | .save_state = parport_gsc_save_state, | |
123 | .restore_state = parport_gsc_restore_state, | |
124 | ||
125 | .epp_write_data = parport_ieee1284_epp_write_data, | |
126 | .epp_read_data = parport_ieee1284_epp_read_data, | |
127 | .epp_write_addr = parport_ieee1284_epp_write_addr, | |
128 | .epp_read_addr = parport_ieee1284_epp_read_addr, | |
129 | ||
130 | .ecp_write_data = parport_ieee1284_ecp_write_data, | |
131 | .ecp_read_data = parport_ieee1284_ecp_read_data, | |
132 | .ecp_write_addr = parport_ieee1284_ecp_write_addr, | |
133 | ||
134 | .compat_write_data = parport_ieee1284_write_compat, | |
135 | .nibble_read_data = parport_ieee1284_read_nibble, | |
136 | .byte_read_data = parport_ieee1284_read_byte, | |
137 | ||
138 | .owner = THIS_MODULE, | |
139 | }; | |
140 | ||
141 | /* --- Mode detection ------------------------------------- */ | |
142 | ||
143 | /* | |
144 | * Checks for port existence, all ports support SPP MODE | |
145 | */ | |
146 | static int __devinit parport_SPP_supported(struct parport *pb) | |
147 | { | |
148 | unsigned char r, w; | |
149 | ||
150 | /* | |
151 | * first clear an eventually pending EPP timeout | |
152 | * I (sailer@ife.ee.ethz.ch) have an SMSC chipset | |
153 | * that does not even respond to SPP cycles if an EPP | |
154 | * timeout is pending | |
155 | */ | |
156 | clear_epp_timeout(pb); | |
157 | ||
158 | /* Do a simple read-write test to make sure the port exists. */ | |
159 | w = 0xc; | |
160 | parport_writeb (w, CONTROL (pb)); | |
161 | ||
162 | /* Is there a control register that we can read from? Some | |
163 | * ports don't allow reads, so read_control just returns a | |
164 | * software copy. Some ports _do_ allow reads, so bypass the | |
165 | * software copy here. In addition, some bits aren't | |
166 | * writable. */ | |
167 | r = parport_readb (CONTROL (pb)); | |
168 | if ((r & 0xf) == w) { | |
169 | w = 0xe; | |
170 | parport_writeb (w, CONTROL (pb)); | |
171 | r = parport_readb (CONTROL (pb)); | |
172 | parport_writeb (0xc, CONTROL (pb)); | |
173 | if ((r & 0xf) == w) | |
174 | return PARPORT_MODE_PCSPP; | |
175 | } | |
176 | ||
177 | /* Try the data register. The data lines aren't tri-stated at | |
178 | * this stage, so we expect back what we wrote. */ | |
179 | w = 0xaa; | |
180 | parport_gsc_write_data (pb, w); | |
181 | r = parport_gsc_read_data (pb); | |
182 | if (r == w) { | |
183 | w = 0x55; | |
184 | parport_gsc_write_data (pb, w); | |
185 | r = parport_gsc_read_data (pb); | |
186 | if (r == w) | |
187 | return PARPORT_MODE_PCSPP; | |
188 | } | |
189 | ||
190 | return 0; | |
191 | } | |
192 | ||
193 | /* Detect PS/2 support. | |
194 | * | |
195 | * Bit 5 (0x20) sets the PS/2 data direction; setting this high | |
196 | * allows us to read data from the data lines. In theory we would get back | |
197 | * 0xff but any peripheral attached to the port may drag some or all of the | |
198 | * lines down to zero. So if we get back anything that isn't the contents | |
199 | * of the data register we deem PS/2 support to be present. | |
200 | * | |
201 | * Some SPP ports have "half PS/2" ability - you can't turn off the line | |
202 | * drivers, but an external peripheral with sufficiently beefy drivers of | |
203 | * its own can overpower them and assert its own levels onto the bus, from | |
204 | * where they can then be read back as normal. Ports with this property | |
205 | * and the right type of device attached are likely to fail the SPP test, | |
206 | * (as they will appear to have stuck bits) and so the fact that they might | |
207 | * be misdetected here is rather academic. | |
208 | */ | |
209 | ||
210 | static int __devinit parport_PS2_supported(struct parport *pb) | |
211 | { | |
212 | int ok = 0; | |
213 | ||
214 | clear_epp_timeout(pb); | |
215 | ||
216 | /* try to tri-state the buffer */ | |
217 | parport_gsc_data_reverse (pb); | |
218 | ||
219 | parport_gsc_write_data(pb, 0x55); | |
220 | if (parport_gsc_read_data(pb) != 0x55) ok++; | |
221 | ||
222 | parport_gsc_write_data(pb, 0xaa); | |
223 | if (parport_gsc_read_data(pb) != 0xaa) ok++; | |
224 | ||
225 | /* cancel input mode */ | |
226 | parport_gsc_data_forward (pb); | |
227 | ||
228 | if (ok) { | |
229 | pb->modes |= PARPORT_MODE_TRISTATE; | |
230 | } else { | |
231 | struct parport_gsc_private *priv = pb->private_data; | |
232 | priv->ctr_writable &= ~0x20; | |
233 | } | |
234 | ||
235 | return ok; | |
236 | } | |
237 | ||
238 | ||
239 | /* --- Initialisation code -------------------------------- */ | |
240 | ||
241 | struct parport *__devinit parport_gsc_probe_port (unsigned long base, | |
242 | unsigned long base_hi, | |
243 | int irq, int dma, | |
244 | struct pci_dev *dev) | |
245 | { | |
246 | struct parport_gsc_private *priv; | |
247 | struct parport_operations *ops; | |
248 | struct parport tmp; | |
249 | struct parport *p = &tmp; | |
250 | ||
cb6fc18e | 251 | priv = kzalloc (sizeof (struct parport_gsc_private), GFP_KERNEL); |
1da177e4 LT |
252 | if (!priv) { |
253 | printk (KERN_DEBUG "parport (0x%lx): no memory!\n", base); | |
254 | return NULL; | |
255 | } | |
256 | ops = kmalloc (sizeof (struct parport_operations), GFP_KERNEL); | |
257 | if (!ops) { | |
258 | printk (KERN_DEBUG "parport (0x%lx): no memory for ops!\n", | |
259 | base); | |
260 | kfree (priv); | |
261 | return NULL; | |
262 | } | |
263 | memcpy (ops, &parport_gsc_ops, sizeof (struct parport_operations)); | |
264 | priv->ctr = 0xc; | |
265 | priv->ctr_writable = 0xff; | |
266 | priv->dma_buf = 0; | |
267 | priv->dma_handle = 0; | |
268 | priv->dev = dev; | |
269 | p->base = base; | |
270 | p->base_hi = base_hi; | |
271 | p->irq = irq; | |
272 | p->dma = dma; | |
273 | p->modes = PARPORT_MODE_PCSPP | PARPORT_MODE_SAFEININT; | |
274 | p->ops = ops; | |
275 | p->private_data = priv; | |
276 | p->physport = p; | |
277 | if (!parport_SPP_supported (p)) { | |
278 | /* No port. */ | |
279 | kfree (priv); | |
280 | return NULL; | |
281 | } | |
282 | parport_PS2_supported (p); | |
283 | ||
284 | if (!(p = parport_register_port(base, PARPORT_IRQ_NONE, | |
285 | PARPORT_DMA_NONE, ops))) { | |
286 | kfree (priv); | |
287 | kfree (ops); | |
288 | return NULL; | |
289 | } | |
290 | ||
291 | p->base_hi = base_hi; | |
292 | p->modes = tmp.modes; | |
293 | p->size = (p->modes & PARPORT_MODE_EPP)?8:3; | |
294 | p->private_data = priv; | |
295 | ||
296 | printk(KERN_INFO "%s: PC-style at 0x%lx", p->name, p->base); | |
297 | p->irq = irq; | |
298 | if (p->irq == PARPORT_IRQ_AUTO) { | |
299 | p->irq = PARPORT_IRQ_NONE; | |
300 | } | |
301 | if (p->irq != PARPORT_IRQ_NONE) { | |
302 | printk(", irq %d", p->irq); | |
303 | ||
304 | if (p->dma == PARPORT_DMA_AUTO) { | |
305 | p->dma = PARPORT_DMA_NONE; | |
306 | } | |
307 | } | |
308 | if (p->dma == PARPORT_DMA_AUTO) /* To use DMA, giving the irq | |
309 | is mandatory (see above) */ | |
310 | p->dma = PARPORT_DMA_NONE; | |
311 | ||
312 | printk(" ["); | |
313 | #define printmode(x) {if(p->modes&PARPORT_MODE_##x){printk("%s%s",f?",":"",#x);f++;}} | |
314 | { | |
315 | int f = 0; | |
316 | printmode(PCSPP); | |
317 | printmode(TRISTATE); | |
318 | printmode(COMPAT) | |
319 | printmode(EPP); | |
320 | // printmode(ECP); | |
321 | // printmode(DMA); | |
322 | } | |
323 | #undef printmode | |
324 | printk("]\n"); | |
325 | ||
326 | if (p->irq != PARPORT_IRQ_NONE) { | |
327 | if (request_irq (p->irq, parport_gsc_interrupt, | |
328 | 0, p->name, p)) { | |
329 | printk (KERN_WARNING "%s: irq %d in use, " | |
330 | "resorting to polled operation\n", | |
331 | p->name, p->irq); | |
332 | p->irq = PARPORT_IRQ_NONE; | |
333 | p->dma = PARPORT_DMA_NONE; | |
334 | } | |
335 | } | |
336 | ||
337 | /* Done probing. Now put the port into a sensible start-up state. */ | |
338 | ||
339 | parport_gsc_write_data(p, 0); | |
340 | parport_gsc_data_forward (p); | |
341 | ||
342 | /* Now that we've told the sharing engine about the port, and | |
343 | found out its characteristics, let the high-level drivers | |
344 | know about it. */ | |
345 | parport_announce_port (p); | |
346 | ||
347 | return p; | |
348 | } | |
349 | ||
350 | ||
351 | #define PARPORT_GSC_OFFSET 0x800 | |
352 | ||
649f0edd | 353 | static int __devinitdata parport_count; |
1da177e4 LT |
354 | |
355 | static int __devinit parport_init_chip(struct parisc_device *dev) | |
356 | { | |
357 | struct parport *p; | |
358 | unsigned long port; | |
359 | ||
360 | if (!dev->irq) { | |
53f01bba MW |
361 | printk(KERN_WARNING "IRQ not found for parallel device at 0x%lx\n", |
362 | dev->hpa.start); | |
1da177e4 LT |
363 | return -ENODEV; |
364 | } | |
365 | ||
53f01bba | 366 | port = dev->hpa.start + PARPORT_GSC_OFFSET; |
1da177e4 LT |
367 | |
368 | /* some older machines with ASP-chip don't support | |
369 | * the enhanced parport modes. | |
370 | */ | |
371 | if (boot_cpu_data.cpu_type > pcxt && !pdc_add_valid(port+4)) { | |
372 | ||
373 | /* Initialize bidirectional-mode (0x10) & data-tranfer-mode #1 (0x20) */ | |
374 | printk("%s: initialize bidirectional-mode.\n", __FUNCTION__); | |
375 | parport_writeb ( (0x10 + 0x20), port + 4); | |
376 | ||
377 | } else { | |
378 | printk("%s: enhanced parport-modes not supported.\n", __FUNCTION__); | |
379 | } | |
380 | ||
381 | p = parport_gsc_probe_port(port, 0, dev->irq, | |
382 | /* PARPORT_IRQ_NONE */ PARPORT_DMA_NONE, NULL); | |
383 | if (p) | |
384 | parport_count++; | |
385 | dev->dev.driver_data = p; | |
386 | ||
387 | return 0; | |
388 | } | |
389 | ||
390 | static int __devexit parport_remove_chip(struct parisc_device *dev) | |
391 | { | |
392 | struct parport *p = dev->dev.driver_data; | |
393 | if (p) { | |
394 | struct parport_gsc_private *priv = p->private_data; | |
395 | struct parport_operations *ops = p->ops; | |
396 | parport_remove_port(p); | |
397 | if (p->dma != PARPORT_DMA_NONE) | |
398 | free_dma(p->dma); | |
399 | if (p->irq != PARPORT_IRQ_NONE) | |
400 | free_irq(p->irq, p); | |
401 | if (priv->dma_buf) | |
402 | pci_free_consistent(priv->dev, PAGE_SIZE, | |
403 | priv->dma_buf, | |
404 | priv->dma_handle); | |
405 | kfree (p->private_data); | |
406 | parport_put_port(p); | |
407 | kfree (ops); /* hope no-one cached it */ | |
408 | } | |
409 | return 0; | |
410 | } | |
411 | ||
412 | static struct parisc_device_id parport_tbl[] = { | |
413 | { HPHW_FIO, HVERSION_REV_ANY_ID, HVERSION_ANY_ID, 0x74 }, | |
414 | { 0, } | |
415 | }; | |
416 | ||
417 | MODULE_DEVICE_TABLE(parisc, parport_tbl); | |
418 | ||
419 | static struct parisc_driver parport_driver = { | |
420 | .name = "Parallel", | |
421 | .id_table = parport_tbl, | |
422 | .probe = parport_init_chip, | |
423 | .remove = __devexit_p(parport_remove_chip), | |
424 | }; | |
425 | ||
426 | int __devinit parport_gsc_init(void) | |
427 | { | |
428 | return register_parisc_driver(&parport_driver); | |
429 | } | |
430 | ||
431 | static void __devexit parport_gsc_exit(void) | |
432 | { | |
433 | unregister_parisc_driver(&parport_driver); | |
434 | } | |
435 | ||
436 | module_init(parport_gsc_init); | |
437 | module_exit(parport_gsc_exit); |