[PARPORT] SUNBPP: Fix OOPS when debugging is enabled.
[linux-2.6.git] / drivers / parport / parport_sunbpp.c
1 /* parport_sunbpp.c: Parallel-port routines for SBUS
2  * 
3  * Author: Derrick J. Brashear <shadow@dementia.org>
4  *
5  * based on work by:
6  *          Phil Blundell <philb@gnu.org>
7  *          Tim Waugh <tim@cyberelk.demon.co.uk>
8  *          Jose Renau <renau@acm.org>
9  *          David Campbell <campbell@tirian.che.curtin.edu.au>
10  *          Grant Guenther <grant@torque.net>
11  *          Eddie C. Dost <ecd@skynet.be>
12  *          Stephen Williams (steve@icarus.com)
13  *          Gus Baldauf (gbaldauf@ix.netcom.com)
14  *          Peter Zaitcev
15  *          Tom Dyas
16  *
17  * Updated to new SBUS device framework: David S. Miller <davem@davemloft.net>
18  * 
19  */
20
21 #include <linux/string.h>
22 #include <linux/module.h>
23 #include <linux/delay.h>
24 #include <linux/errno.h>
25 #include <linux/ioport.h>
26 #include <linux/kernel.h>
27 #include <linux/slab.h>
28 #include <linux/init.h>
29
30 #include <linux/parport.h>
31
32 #include <asm/ptrace.h>
33 #include <linux/interrupt.h>
34
35 #include <asm/io.h>
36 #include <asm/oplib.h>           /* OpenProm Library */
37 #include <asm/sbus.h>
38 #include <asm/dma.h>             /* BPP uses LSI 64854 for DMA */
39 #include <asm/irq.h>
40 #include <asm/sunbpp.h>
41
42 #undef __SUNBPP_DEBUG
43 #ifdef __SUNBPP_DEBUG
44 #define dprintk(x) printk x
45 #else
46 #define dprintk(x)
47 #endif
48
49 static irqreturn_t parport_sunbpp_interrupt(int irq, void *dev_id)
50 {
51         parport_generic_irq(irq, (struct parport *) dev_id);
52         return IRQ_HANDLED;
53 }
54
55 static void parport_sunbpp_disable_irq(struct parport *p)
56 {
57         struct bpp_regs __iomem *regs = (struct bpp_regs __iomem *)p->base;
58         u32 tmp;
59
60         tmp = sbus_readl(&regs->p_csr);
61         tmp &= ~DMA_INT_ENAB;
62         sbus_writel(tmp, &regs->p_csr);
63 }
64
65 static void parport_sunbpp_enable_irq(struct parport *p)
66 {
67         struct bpp_regs __iomem *regs = (struct bpp_regs __iomem *)p->base;
68         u32 tmp;
69
70         tmp = sbus_readl(&regs->p_csr);
71         tmp |= DMA_INT_ENAB;
72         sbus_writel(tmp, &regs->p_csr);
73 }
74
75 static void parport_sunbpp_write_data(struct parport *p, unsigned char d)
76 {
77         struct bpp_regs __iomem *regs = (struct bpp_regs __iomem *)p->base;
78
79         sbus_writeb(d, &regs->p_dr);
80         dprintk((KERN_DEBUG "wrote 0x%x\n", d));
81 }
82
83 static unsigned char parport_sunbpp_read_data(struct parport *p)
84 {
85         struct bpp_regs __iomem *regs = (struct bpp_regs __iomem *)p->base;
86
87         return sbus_readb(&regs->p_dr);
88 }
89
90 #if 0
91 static void control_pc_to_sunbpp(struct parport *p, unsigned char status)
92 {
93         struct bpp_regs __iomem *regs = (struct bpp_regs __iomem *)p->base;
94         unsigned char value_tcr = sbus_readb(&regs->p_tcr);
95         unsigned char value_or = sbus_readb(&regs->p_or);
96
97         if (status & PARPORT_CONTROL_STROBE) 
98                 value_tcr |= P_TCR_DS;
99         if (status & PARPORT_CONTROL_AUTOFD) 
100                 value_or |= P_OR_AFXN;
101         if (status & PARPORT_CONTROL_INIT) 
102                 value_or |= P_OR_INIT;
103         if (status & PARPORT_CONTROL_SELECT) 
104                 value_or |= P_OR_SLCT_IN;
105
106         sbus_writeb(value_or, &regs->p_or);
107         sbus_writeb(value_tcr, &regs->p_tcr);
108 }
109 #endif
110
111 static unsigned char status_sunbpp_to_pc(struct parport *p)
112 {
113         struct bpp_regs __iomem *regs = (struct bpp_regs __iomem *)p->base;
114         unsigned char bits = 0;
115         unsigned char value_tcr = sbus_readb(&regs->p_tcr);
116         unsigned char value_ir = sbus_readb(&regs->p_ir);
117
118         if (!(value_ir & P_IR_ERR))
119                 bits |= PARPORT_STATUS_ERROR;
120         if (!(value_ir & P_IR_SLCT))
121                 bits |= PARPORT_STATUS_SELECT;
122         if (!(value_ir & P_IR_PE))
123                 bits |= PARPORT_STATUS_PAPEROUT;
124         if (value_tcr & P_TCR_ACK)
125                 bits |= PARPORT_STATUS_ACK;
126         if (!(value_tcr & P_TCR_BUSY))
127                 bits |= PARPORT_STATUS_BUSY;
128
129         dprintk((KERN_DEBUG "tcr 0x%x ir 0x%x\n", value_tcr, value_ir));
130         dprintk((KERN_DEBUG "read status 0x%x\n", bits));
131         return bits;
132 }
133
134 static unsigned char control_sunbpp_to_pc(struct parport *p)
135 {
136         struct bpp_regs __iomem *regs = (struct bpp_regs __iomem *)p->base;
137         unsigned char bits = 0;
138         unsigned char value_tcr = sbus_readb(&regs->p_tcr);
139         unsigned char value_or = sbus_readb(&regs->p_or);
140
141         if (!(value_tcr & P_TCR_DS))
142                 bits |= PARPORT_CONTROL_STROBE;
143         if (!(value_or & P_OR_AFXN))
144                 bits |= PARPORT_CONTROL_AUTOFD;
145         if (!(value_or & P_OR_INIT))
146                 bits |= PARPORT_CONTROL_INIT;
147         if (value_or & P_OR_SLCT_IN)
148                 bits |= PARPORT_CONTROL_SELECT;
149
150         dprintk((KERN_DEBUG "tcr 0x%x or 0x%x\n", value_tcr, value_or));
151         dprintk((KERN_DEBUG "read control 0x%x\n", bits));
152         return bits;
153 }
154
155 static unsigned char parport_sunbpp_read_control(struct parport *p)
156 {
157         return control_sunbpp_to_pc(p);
158 }
159
160 static unsigned char parport_sunbpp_frob_control(struct parport *p,
161                                                  unsigned char mask,
162                                                  unsigned char val)
163 {
164         struct bpp_regs __iomem *regs = (struct bpp_regs __iomem *)p->base;
165         unsigned char value_tcr = sbus_readb(&regs->p_tcr);
166         unsigned char value_or = sbus_readb(&regs->p_or);
167
168         dprintk((KERN_DEBUG "frob1: tcr 0x%x or 0x%x\n",
169                  value_tcr, value_or));
170         if (mask & PARPORT_CONTROL_STROBE) {
171                 if (val & PARPORT_CONTROL_STROBE) {
172                         value_tcr &= ~P_TCR_DS;
173                 } else {
174                         value_tcr |= P_TCR_DS;
175                 }
176         }
177         if (mask & PARPORT_CONTROL_AUTOFD) {
178                 if (val & PARPORT_CONTROL_AUTOFD) {
179                         value_or &= ~P_OR_AFXN;
180                 } else {
181                         value_or |= P_OR_AFXN;
182                 }
183         }
184         if (mask & PARPORT_CONTROL_INIT) {
185                 if (val & PARPORT_CONTROL_INIT) {
186                         value_or &= ~P_OR_INIT;
187                 } else {
188                         value_or |= P_OR_INIT;
189                 }
190         }
191         if (mask & PARPORT_CONTROL_SELECT) {
192                 if (val & PARPORT_CONTROL_SELECT) {
193                         value_or |= P_OR_SLCT_IN;
194                 } else {
195                         value_or &= ~P_OR_SLCT_IN;
196                 }
197         }
198
199         sbus_writeb(value_or, &regs->p_or);
200         sbus_writeb(value_tcr, &regs->p_tcr);
201         dprintk((KERN_DEBUG "frob2: tcr 0x%x or 0x%x\n",
202                  value_tcr, value_or));
203         return parport_sunbpp_read_control(p);
204 }
205
206 static void parport_sunbpp_write_control(struct parport *p, unsigned char d)
207 {
208         const unsigned char wm = (PARPORT_CONTROL_STROBE |
209                                   PARPORT_CONTROL_AUTOFD |
210                                   PARPORT_CONTROL_INIT |
211                                   PARPORT_CONTROL_SELECT);
212
213         parport_sunbpp_frob_control (p, wm, d & wm);
214 }
215
216 static unsigned char parport_sunbpp_read_status(struct parport *p)
217 {
218         return status_sunbpp_to_pc(p);
219 }
220
221 static void parport_sunbpp_data_forward (struct parport *p)
222 {
223         struct bpp_regs __iomem *regs = (struct bpp_regs __iomem *)p->base;
224         unsigned char value_tcr = sbus_readb(&regs->p_tcr);
225
226         dprintk((KERN_DEBUG "forward\n"));
227         value_tcr &= ~P_TCR_DIR;
228         sbus_writeb(value_tcr, &regs->p_tcr);
229 }
230
231 static void parport_sunbpp_data_reverse (struct parport *p)
232 {
233         struct bpp_regs __iomem *regs = (struct bpp_regs __iomem *)p->base;
234         u8 val = sbus_readb(&regs->p_tcr);
235
236         dprintk((KERN_DEBUG "reverse\n"));
237         val |= P_TCR_DIR;
238         sbus_writeb(val, &regs->p_tcr);
239 }
240
241 static void parport_sunbpp_init_state(struct pardevice *dev, struct parport_state *s)
242 {
243         s->u.pc.ctr = 0xc;
244         s->u.pc.ecr = 0x0;
245 }
246
247 static void parport_sunbpp_save_state(struct parport *p, struct parport_state *s)
248 {
249         s->u.pc.ctr = parport_sunbpp_read_control(p);
250 }
251
252 static void parport_sunbpp_restore_state(struct parport *p, struct parport_state *s)
253 {
254         parport_sunbpp_write_control(p, s->u.pc.ctr);
255 }
256
257 static struct parport_operations parport_sunbpp_ops = 
258 {
259         .write_data     = parport_sunbpp_write_data,
260         .read_data      = parport_sunbpp_read_data,
261
262         .write_control  = parport_sunbpp_write_control,
263         .read_control   = parport_sunbpp_read_control,
264         .frob_control   = parport_sunbpp_frob_control,
265
266         .read_status    = parport_sunbpp_read_status,
267
268         .enable_irq     = parport_sunbpp_enable_irq,
269         .disable_irq    = parport_sunbpp_disable_irq,
270
271         .data_forward   = parport_sunbpp_data_forward,
272         .data_reverse   = parport_sunbpp_data_reverse,
273
274         .init_state     = parport_sunbpp_init_state,
275         .save_state     = parport_sunbpp_save_state,
276         .restore_state  = parport_sunbpp_restore_state,
277
278         .epp_write_data = parport_ieee1284_epp_write_data,
279         .epp_read_data  = parport_ieee1284_epp_read_data,
280         .epp_write_addr = parport_ieee1284_epp_write_addr,
281         .epp_read_addr  = parport_ieee1284_epp_read_addr,
282
283         .ecp_write_data = parport_ieee1284_ecp_write_data,
284         .ecp_read_data  = parport_ieee1284_ecp_read_data,
285         .ecp_write_addr = parport_ieee1284_ecp_write_addr,
286
287         .compat_write_data      = parport_ieee1284_write_compat,
288         .nibble_read_data       = parport_ieee1284_read_nibble,
289         .byte_read_data         = parport_ieee1284_read_byte,
290
291         .owner          = THIS_MODULE,
292 };
293
294 static int __devinit init_one_port(struct sbus_dev *sdev)
295 {
296         struct parport *p;
297         /* at least in theory there may be a "we don't dma" case */
298         struct parport_operations *ops;
299         void __iomem *base;
300         int irq, dma, err = 0, size;
301         struct bpp_regs __iomem *regs;
302         unsigned char value_tcr;
303
304         irq = sdev->irqs[0];
305         base = sbus_ioremap(&sdev->resource[0], 0,
306                             sdev->reg_addrs[0].reg_size, 
307                             "sunbpp");
308         if (!base)
309                 return -ENODEV;
310
311         size = sdev->reg_addrs[0].reg_size;
312         dma = PARPORT_DMA_NONE;
313
314         ops = kmalloc(sizeof(struct parport_operations), GFP_KERNEL);
315         if (!ops)
316                 goto out_unmap;
317
318         memcpy (ops, &parport_sunbpp_ops, sizeof (struct parport_operations));
319
320         dprintk(("register_port\n"));
321         if (!(p = parport_register_port((unsigned long)base, irq, dma, ops)))
322                 goto out_free_ops;
323
324         p->size = size;
325
326         if ((err = request_irq(p->irq, parport_sunbpp_interrupt,
327                                IRQF_SHARED, p->name, p)) != 0) {
328                 goto out_put_port;
329         }
330
331         parport_sunbpp_enable_irq(p);
332
333         regs = (struct bpp_regs __iomem *)p->base;
334
335         value_tcr = sbus_readb(&regs->p_tcr);
336         value_tcr &= ~P_TCR_DIR;
337         sbus_writeb(value_tcr, &regs->p_tcr);
338
339         printk(KERN_INFO "%s: sunbpp at 0x%lx\n", p->name, p->base);
340
341         dev_set_drvdata(&sdev->ofdev.dev, p);
342
343         parport_announce_port(p);
344
345         return 0;
346
347 out_put_port:
348         parport_put_port(p);
349
350 out_free_ops:
351         kfree(ops);
352
353 out_unmap:
354         sbus_iounmap(base, size);
355
356         return err;
357 }
358
359 static int __devinit bpp_probe(struct of_device *dev, const struct of_device_id *match)
360 {
361         struct sbus_dev *sdev = to_sbus_device(&dev->dev);
362
363         return init_one_port(sdev);
364 }
365
366 static int __devexit bpp_remove(struct of_device *dev)
367 {
368         struct parport *p = dev_get_drvdata(&dev->dev);
369         struct parport_operations *ops = p->ops;
370
371         parport_remove_port(p);
372
373         if (p->irq != PARPORT_IRQ_NONE) {
374                 parport_sunbpp_disable_irq(p);
375                 free_irq(p->irq, p);
376         }
377
378         sbus_iounmap((void __iomem *) p->base, p->size);
379         parport_put_port(p);
380         kfree(ops);
381
382         dev_set_drvdata(&dev->dev, NULL);
383
384         return 0;
385 }
386
387 static struct of_device_id bpp_match[] = {
388         {
389                 .name = "SUNW,bpp",
390         },
391         {},
392 };
393
394 MODULE_DEVICE_TABLE(of, bpp_match);
395
396 static struct of_platform_driver bpp_sbus_driver = {
397         .name           = "bpp",
398         .match_table    = bpp_match,
399         .probe          = bpp_probe,
400         .remove         = __devexit_p(bpp_remove),
401 };
402
403 static int __init parport_sunbpp_init(void)
404 {
405         return of_register_driver(&bpp_sbus_driver, &sbus_bus_type);
406 }
407
408 static void __exit parport_sunbpp_exit(void)
409 {
410         of_unregister_driver(&bpp_sbus_driver);
411 }
412
413 MODULE_AUTHOR("Derrick J Brashear");
414 MODULE_DESCRIPTION("Parport Driver for Sparc bidirectional Port");
415 MODULE_SUPPORTED_DEVICE("Sparc Bidirectional Parallel Port");
416 MODULE_VERSION("2.0");
417 MODULE_LICENSE("GPL");
418
419 module_init(parport_sunbpp_init)
420 module_exit(parport_sunbpp_exit)