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