Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/sparc-2.6
[linux-2.6.git] / drivers / parport / parport_ax88796.c
1 /* linux/drivers/parport/parport_ax88796.c
2  *
3  * (c) 2005,2006 Simtec Electronics
4  *      Ben Dooks <ben@simtec.co.uk>
5  *
6  * This program is free software; you can redistribute it and/or modify
7  * it under the terms of the GNU General Public License version 2 as
8  * published by the Free Software Foundation.
9  *
10 */
11
12 #include <linux/module.h>
13 #include <linux/kernel.h>
14 #include <linux/parport.h>
15 #include <linux/interrupt.h>
16 #include <linux/errno.h>
17 #include <linux/platform_device.h>
18
19 #include <asm/io.h>
20 #include <asm/irq.h>
21
22 #define AX_SPR_BUSY             (1<<7)
23 #define AX_SPR_ACK              (1<<6)
24 #define AX_SPR_PE               (1<<5)
25 #define AX_SPR_SLCT             (1<<4)
26 #define AX_SPR_ERR              (1<<3)
27
28 #define AX_CPR_nDOE             (1<<5)
29 #define AX_CPR_SLCTIN           (1<<3)
30 #define AX_CPR_nINIT            (1<<2)
31 #define AX_CPR_ATFD             (1<<1)
32 #define AX_CPR_STRB             (1<<0)
33
34 struct ax_drvdata {
35         struct parport          *parport;
36         struct parport_state     suspend;
37
38         struct device           *dev;
39         struct resource         *io;
40
41         unsigned char            irq_enabled;
42
43         void __iomem            *base;
44         void __iomem            *spp_data;
45         void __iomem            *spp_spr;
46         void __iomem            *spp_cpr;
47 };
48
49 static inline struct ax_drvdata *pp_to_drv(struct parport *p)
50 {
51         return p->private_data;
52 }
53
54 static unsigned char
55 parport_ax88796_read_data(struct parport *p)
56 {
57         struct ax_drvdata *dd = pp_to_drv(p);
58
59         return readb(dd->spp_data);
60 }
61
62 static void
63 parport_ax88796_write_data(struct parport *p, unsigned char data)
64 {
65         struct ax_drvdata *dd = pp_to_drv(p);
66
67         writeb(data, dd->spp_data);
68 }
69
70 static unsigned char
71 parport_ax88796_read_control(struct parport *p)
72 {
73         struct ax_drvdata *dd = pp_to_drv(p);
74         unsigned int cpr = readb(dd->spp_cpr);
75         unsigned int ret = 0;
76
77         if (!(cpr & AX_CPR_STRB))
78                 ret |= PARPORT_CONTROL_STROBE;
79
80         if (!(cpr & AX_CPR_ATFD))
81                 ret |= PARPORT_CONTROL_AUTOFD;
82
83         if (cpr & AX_CPR_nINIT)
84                 ret |= PARPORT_CONTROL_INIT;
85
86         if (!(cpr & AX_CPR_SLCTIN))
87                 ret |= PARPORT_CONTROL_SELECT;
88
89         return ret;
90 }
91
92 static void
93 parport_ax88796_write_control(struct parport *p, unsigned char control)
94 {
95         struct ax_drvdata *dd = pp_to_drv(p);
96         unsigned int cpr = readb(dd->spp_cpr);
97
98         cpr &= AX_CPR_nDOE;
99
100         if (!(control & PARPORT_CONTROL_STROBE))
101                 cpr |= AX_CPR_STRB;
102
103         if (!(control & PARPORT_CONTROL_AUTOFD))
104                 cpr |= AX_CPR_ATFD;
105
106         if (control & PARPORT_CONTROL_INIT)
107                 cpr |= AX_CPR_nINIT;
108
109         if (!(control & PARPORT_CONTROL_SELECT))
110                 cpr |= AX_CPR_SLCTIN;
111
112         dev_dbg(dd->dev, "write_control: ctrl=%02x, cpr=%02x\n", control, cpr);
113         writeb(cpr, dd->spp_cpr);
114
115         if (parport_ax88796_read_control(p) != control) {
116                 dev_err(dd->dev, "write_control: read != set (%02x, %02x)\n",
117                         parport_ax88796_read_control(p), control);
118         }
119 }
120
121 static unsigned char
122 parport_ax88796_read_status(struct parport *p)
123 {
124         struct ax_drvdata *dd = pp_to_drv(p);
125         unsigned int status = readb(dd->spp_spr);
126         unsigned int ret = 0;
127
128         if (status & AX_SPR_BUSY)
129                 ret |= PARPORT_STATUS_BUSY;
130
131         if (status & AX_SPR_ACK)
132                 ret |= PARPORT_STATUS_ACK;
133
134         if (status & AX_SPR_ERR)
135                 ret |= PARPORT_STATUS_ERROR;
136
137         if (status & AX_SPR_SLCT)
138                 ret |= PARPORT_STATUS_SELECT;
139
140         if (status & AX_SPR_PE)
141                 ret |= PARPORT_STATUS_PAPEROUT;
142
143         return ret;
144 }
145
146 static unsigned char
147 parport_ax88796_frob_control(struct parport *p, unsigned char mask,
148                              unsigned char val)
149 {
150         struct ax_drvdata *dd = pp_to_drv(p);
151         unsigned char old = parport_ax88796_read_control(p);
152
153         dev_dbg(dd->dev, "frob: mask=%02x, val=%02x, old=%02x\n",
154                 mask, val, old);
155
156         parport_ax88796_write_control(p, (old & ~mask) | val);
157         return old;
158 }
159
160 static void
161 parport_ax88796_enable_irq(struct parport *p)
162 {
163         struct ax_drvdata *dd = pp_to_drv(p);
164         unsigned long flags;
165
166         local_irq_save(flags);
167         if (!dd->irq_enabled) {
168                 enable_irq(p->irq);
169                 dd->irq_enabled = 1;
170         }
171         local_irq_restore(flags);
172 }
173
174 static void
175 parport_ax88796_disable_irq(struct parport *p)
176 {
177         struct ax_drvdata *dd = pp_to_drv(p);
178         unsigned long flags;
179
180         local_irq_save(flags);
181         if (dd->irq_enabled) {
182                 disable_irq(p->irq);
183                 dd->irq_enabled = 0;
184         }
185         local_irq_restore(flags);
186 }
187
188 static void
189 parport_ax88796_data_forward(struct parport *p)
190 {
191         struct ax_drvdata *dd = pp_to_drv(p);
192         void __iomem *cpr = dd->spp_cpr;
193
194         writeb((readb(cpr) & ~AX_CPR_nDOE), cpr);
195 }
196
197 static void
198 parport_ax88796_data_reverse(struct parport *p)
199 {
200         struct ax_drvdata *dd = pp_to_drv(p);
201         void __iomem *cpr = dd->spp_cpr;
202
203         writeb(readb(cpr) | AX_CPR_nDOE, cpr);
204 }
205
206 static void
207 parport_ax88796_init_state(struct pardevice *d, struct parport_state *s)
208 {
209         struct ax_drvdata *dd = pp_to_drv(d->port);
210
211         memset(s, 0, sizeof(struct parport_state));
212
213         dev_dbg(dd->dev, "init_state: %p: state=%p\n", d, s);
214         s->u.ax88796.cpr = readb(dd->spp_cpr);
215 }
216
217 static void
218 parport_ax88796_save_state(struct parport *p, struct parport_state *s)
219 {
220         struct ax_drvdata *dd = pp_to_drv(p);
221
222         dev_dbg(dd->dev, "save_state: %p: state=%p\n", p, s);
223         s->u.ax88796.cpr = readb(dd->spp_cpr);
224 }
225
226 static void
227 parport_ax88796_restore_state(struct parport *p, struct parport_state *s)
228 {
229         struct ax_drvdata *dd = pp_to_drv(p);
230
231         dev_dbg(dd->dev, "restore_state: %p: state=%p\n", p, s);
232         writeb(s->u.ax88796.cpr, dd->spp_cpr);
233 }
234
235 static struct parport_operations parport_ax88796_ops = {
236         .write_data     = parport_ax88796_write_data,
237         .read_data      = parport_ax88796_read_data,
238
239         .write_control  = parport_ax88796_write_control,
240         .read_control   = parport_ax88796_read_control,
241         .frob_control   = parport_ax88796_frob_control,
242
243         .read_status    = parport_ax88796_read_status,
244
245         .enable_irq     = parport_ax88796_enable_irq,
246         .disable_irq    = parport_ax88796_disable_irq,
247
248         .data_forward   = parport_ax88796_data_forward,
249         .data_reverse   = parport_ax88796_data_reverse,
250
251         .init_state     = parport_ax88796_init_state,
252         .save_state     = parport_ax88796_save_state,
253         .restore_state  = parport_ax88796_restore_state,
254
255         .epp_write_data = parport_ieee1284_epp_write_data,
256         .epp_read_data  = parport_ieee1284_epp_read_data,
257         .epp_write_addr = parport_ieee1284_epp_write_addr,
258         .epp_read_addr  = parport_ieee1284_epp_read_addr,
259
260         .ecp_write_data = parport_ieee1284_ecp_write_data,
261         .ecp_read_data  = parport_ieee1284_ecp_read_data,
262         .ecp_write_addr = parport_ieee1284_ecp_write_addr,
263
264         .compat_write_data      = parport_ieee1284_write_compat,
265         .nibble_read_data       = parport_ieee1284_read_nibble,
266         .byte_read_data         = parport_ieee1284_read_byte,
267
268         .owner          = THIS_MODULE,
269 };
270
271 static int parport_ax88796_probe(struct platform_device *pdev)
272 {
273         struct device *_dev = &pdev->dev;
274         struct ax_drvdata *dd;
275         struct parport *pp = NULL;
276         struct resource *res;
277         unsigned long size;
278         int spacing;
279         int irq;
280         int ret;
281
282         dd = kzalloc(sizeof(struct ax_drvdata), GFP_KERNEL);
283         if (dd == NULL) {
284                 dev_err(_dev, "no memory for private data\n");
285                 return -ENOMEM;
286         }
287
288         res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
289         if (res == NULL) {
290                 dev_err(_dev, "no MEM specified\n");
291                 ret = -ENXIO;
292                 goto exit_mem;
293         }
294
295         size = (res->end - res->start) + 1;
296         spacing = size / 3;
297
298         dd->io = request_mem_region(res->start, size, pdev->name);
299         if (dd->io == NULL) {
300                 dev_err(_dev, "cannot reserve memory\n");
301                 ret = -ENXIO;
302                 goto exit_mem;
303         }
304
305         dd->base = ioremap(res->start, size);
306         if (dd->base == NULL) {
307                 dev_err(_dev, "cannot ioremap region\n");
308                 ret = -ENXIO;
309                 goto exit_res;
310         }
311
312         irq = platform_get_irq(pdev, 0);
313         if (irq <= 0)
314                 irq = PARPORT_IRQ_NONE;
315
316         pp = parport_register_port((unsigned long)dd->base, irq,
317                                    PARPORT_DMA_NONE,
318                                    &parport_ax88796_ops);
319
320         if (pp == NULL) {
321                 dev_err(_dev, "failed to register parallel port\n");
322                 ret = -ENOMEM;
323                 goto exit_unmap;
324         }
325
326         pp->private_data = dd;
327         dd->parport = pp;
328         dd->dev = _dev;
329
330         dd->spp_data = dd->base;
331         dd->spp_spr  = dd->base + (spacing * 1);
332         dd->spp_cpr  = dd->base + (spacing * 2);
333
334         /* initialise the port controls */
335         writeb(AX_CPR_STRB, dd->spp_cpr);
336
337         if (irq >= 0) {
338                 /* request irq */
339                 ret = request_irq(irq, parport_irq_handler,
340                                   IRQF_TRIGGER_FALLING, pdev->name, pp);
341
342                 if (ret < 0)
343                         goto exit_port;
344
345                 dd->irq_enabled = 1;
346         }
347
348         platform_set_drvdata(pdev, pp);
349
350         dev_info(_dev, "attached parallel port driver\n");
351         parport_announce_port(pp);
352
353         return 0;
354
355  exit_port:
356         parport_remove_port(pp);
357  exit_unmap:
358         iounmap(dd->base);
359  exit_res:
360         release_resource(dd->io);
361         kfree(dd->io);
362  exit_mem:
363         kfree(dd);
364         return ret;
365 }
366
367 static int parport_ax88796_remove(struct platform_device *pdev)
368 {
369         struct parport *p = platform_get_drvdata(pdev);
370         struct ax_drvdata *dd = pp_to_drv(p);
371
372         free_irq(p->irq, p);
373         parport_remove_port(p);
374         iounmap(dd->base);
375         release_resource(dd->io);
376         kfree(dd->io);
377         kfree(dd);
378
379         return 0;
380 }
381
382 #ifdef CONFIG_PM
383
384 static int parport_ax88796_suspend(struct platform_device *dev,
385                                    pm_message_t state)
386 {
387         struct parport *p = platform_get_drvdata(dev);
388         struct ax_drvdata *dd = pp_to_drv(p);
389
390         parport_ax88796_save_state(p, &dd->suspend);
391         writeb(AX_CPR_nDOE | AX_CPR_STRB, dd->spp_cpr);
392         return 0;
393 }
394
395 static int parport_ax88796_resume(struct platform_device *dev)
396 {
397         struct parport *p = platform_get_drvdata(dev);
398         struct ax_drvdata *dd = pp_to_drv(p);
399
400         parport_ax88796_restore_state(p, &dd->suspend);
401         return 0;
402 }
403
404 #else
405 #define parport_ax88796_suspend NULL
406 #define parport_ax88796_resume  NULL
407 #endif
408
409 MODULE_ALIAS("platform:ax88796-pp");
410
411 static struct platform_driver axdrv = {
412         .driver         = {
413                 .name   = "ax88796-pp",
414                 .owner  = THIS_MODULE,
415         },
416         .probe          = parport_ax88796_probe,
417         .remove         = parport_ax88796_remove,
418         .suspend        = parport_ax88796_suspend,
419         .resume         = parport_ax88796_resume,
420 };
421
422 static int __init parport_ax88796_init(void)
423 {
424         return platform_driver_register(&axdrv);
425 }
426
427 static void __exit parport_ax88796_exit(void)
428 {
429         platform_driver_unregister(&axdrv);
430 }
431
432 module_init(parport_ax88796_init)
433 module_exit(parport_ax88796_exit)
434
435 MODULE_AUTHOR("Ben Dooks <ben@simtec.co.uk>");
436 MODULE_DESCRIPTION("AX88796 Parport parallel port driver");
437 MODULE_LICENSE("GPL");