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