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 #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 #if 0
86 static void control_pc_to_sunbpp(struct parport *p, unsigned char status)
87 {
88 	struct bpp_regs __iomem *regs = (struct bpp_regs __iomem *)p->base;
89 	unsigned char value_tcr = sbus_readb(&regs->p_tcr);
90 	unsigned char value_or = sbus_readb(&regs->p_or);
91 
92 	if (status & PARPORT_CONTROL_STROBE)
93 		value_tcr |= P_TCR_DS;
94 	if (status & PARPORT_CONTROL_AUTOFD)
95 		value_or |= P_OR_AFXN;
96 	if (status & PARPORT_CONTROL_INIT)
97 		value_or |= P_OR_INIT;
98 	if (status & PARPORT_CONTROL_SELECT)
99 		value_or |= P_OR_SLCT_IN;
100 
101 	sbus_writeb(value_or, &regs->p_or);
102 	sbus_writeb(value_tcr, &regs->p_tcr);
103 }
104 #endif
105 
106 static unsigned char status_sunbpp_to_pc(struct parport *p)
107 {
108 	struct bpp_regs __iomem *regs = (struct bpp_regs __iomem *)p->base;
109 	unsigned char bits = 0;
110 	unsigned char value_tcr = sbus_readb(&regs->p_tcr);
111 	unsigned char value_ir = sbus_readb(&regs->p_ir);
112 
113 	if (!(value_ir & P_IR_ERR))
114 		bits |= PARPORT_STATUS_ERROR;
115 	if (!(value_ir & P_IR_SLCT))
116 		bits |= PARPORT_STATUS_SELECT;
117 	if (!(value_ir & P_IR_PE))
118 		bits |= PARPORT_STATUS_PAPEROUT;
119 	if (value_tcr & P_TCR_ACK)
120 		bits |= PARPORT_STATUS_ACK;
121 	if (!(value_tcr & P_TCR_BUSY))
122 		bits |= PARPORT_STATUS_BUSY;
123 
124 	dprintk((KERN_DEBUG "tcr 0x%x ir 0x%x\n", value_tcr, value_ir));
125 	dprintk((KERN_DEBUG "read status 0x%x\n", bits));
126 	return bits;
127 }
128 
129 static unsigned char control_sunbpp_to_pc(struct parport *p)
130 {
131 	struct bpp_regs __iomem *regs = (struct bpp_regs __iomem *)p->base;
132 	unsigned char bits = 0;
133 	unsigned char value_tcr = sbus_readb(&regs->p_tcr);
134 	unsigned char value_or = sbus_readb(&regs->p_or);
135 
136 	if (!(value_tcr & P_TCR_DS))
137 		bits |= PARPORT_CONTROL_STROBE;
138 	if (!(value_or & P_OR_AFXN))
139 		bits |= PARPORT_CONTROL_AUTOFD;
140 	if (!(value_or & P_OR_INIT))
141 		bits |= PARPORT_CONTROL_INIT;
142 	if (value_or & P_OR_SLCT_IN)
143 		bits |= PARPORT_CONTROL_SELECT;
144 
145 	dprintk((KERN_DEBUG "tcr 0x%x or 0x%x\n", value_tcr, value_or));
146 	dprintk((KERN_DEBUG "read control 0x%x\n", bits));
147 	return bits;
148 }
149 
150 static unsigned char parport_sunbpp_read_control(struct parport *p)
151 {
152 	return control_sunbpp_to_pc(p);
153 }
154 
155 static unsigned char parport_sunbpp_frob_control(struct parport *p,
156 						 unsigned char mask,
157 						 unsigned char val)
158 {
159 	struct bpp_regs __iomem *regs = (struct bpp_regs __iomem *)p->base;
160 	unsigned char value_tcr = sbus_readb(&regs->p_tcr);
161 	unsigned char value_or = sbus_readb(&regs->p_or);
162 
163 	dprintk((KERN_DEBUG "frob1: tcr 0x%x or 0x%x\n",
164 		 value_tcr, value_or));
165 	if (mask & PARPORT_CONTROL_STROBE) {
166 		if (val & PARPORT_CONTROL_STROBE) {
167 			value_tcr &= ~P_TCR_DS;
168 		} else {
169 			value_tcr |= P_TCR_DS;
170 		}
171 	}
172 	if (mask & PARPORT_CONTROL_AUTOFD) {
173 		if (val & PARPORT_CONTROL_AUTOFD) {
174 			value_or &= ~P_OR_AFXN;
175 		} else {
176 			value_or |= P_OR_AFXN;
177 		}
178 	}
179 	if (mask & PARPORT_CONTROL_INIT) {
180 		if (val & PARPORT_CONTROL_INIT) {
181 			value_or &= ~P_OR_INIT;
182 		} else {
183 			value_or |= P_OR_INIT;
184 		}
185 	}
186 	if (mask & PARPORT_CONTROL_SELECT) {
187 		if (val & PARPORT_CONTROL_SELECT) {
188 			value_or |= P_OR_SLCT_IN;
189 		} else {
190 			value_or &= ~P_OR_SLCT_IN;
191 		}
192 	}
193 
194 	sbus_writeb(value_or, &regs->p_or);
195 	sbus_writeb(value_tcr, &regs->p_tcr);
196 	dprintk((KERN_DEBUG "frob2: tcr 0x%x or 0x%x\n",
197 		 value_tcr, value_or));
198 	return parport_sunbpp_read_control(p);
199 }
200 
201 static void parport_sunbpp_write_control(struct parport *p, unsigned char d)
202 {
203 	const unsigned char wm = (PARPORT_CONTROL_STROBE |
204 				  PARPORT_CONTROL_AUTOFD |
205 				  PARPORT_CONTROL_INIT |
206 				  PARPORT_CONTROL_SELECT);
207 
208 	parport_sunbpp_frob_control (p, wm, d & wm);
209 }
210 
211 static unsigned char parport_sunbpp_read_status(struct parport *p)
212 {
213 	return status_sunbpp_to_pc(p);
214 }
215 
216 static void parport_sunbpp_data_forward (struct parport *p)
217 {
218 	struct bpp_regs __iomem *regs = (struct bpp_regs __iomem *)p->base;
219 	unsigned char value_tcr = sbus_readb(&regs->p_tcr);
220 
221 	dprintk((KERN_DEBUG "forward\n"));
222 	value_tcr &= ~P_TCR_DIR;
223 	sbus_writeb(value_tcr, &regs->p_tcr);
224 }
225 
226 static void parport_sunbpp_data_reverse (struct parport *p)
227 {
228 	struct bpp_regs __iomem *regs = (struct bpp_regs __iomem *)p->base;
229 	u8 val = sbus_readb(&regs->p_tcr);
230 
231 	dprintk((KERN_DEBUG "reverse\n"));
232 	val |= P_TCR_DIR;
233 	sbus_writeb(val, &regs->p_tcr);
234 }
235 
236 static void parport_sunbpp_init_state(struct pardevice *dev, struct parport_state *s)
237 {
238 	s->u.pc.ctr = 0xc;
239 	s->u.pc.ecr = 0x0;
240 }
241 
242 static void parport_sunbpp_save_state(struct parport *p, struct parport_state *s)
243 {
244 	s->u.pc.ctr = parport_sunbpp_read_control(p);
245 }
246 
247 static void parport_sunbpp_restore_state(struct parport *p, struct parport_state *s)
248 {
249 	parport_sunbpp_write_control(p, s->u.pc.ctr);
250 }
251 
252 static struct parport_operations parport_sunbpp_ops =
253 {
254 	.write_data	= parport_sunbpp_write_data,
255 	.read_data	= parport_sunbpp_read_data,
256 
257 	.write_control	= parport_sunbpp_write_control,
258 	.read_control	= parport_sunbpp_read_control,
259 	.frob_control	= parport_sunbpp_frob_control,
260 
261 	.read_status	= parport_sunbpp_read_status,
262 
263 	.enable_irq	= parport_sunbpp_enable_irq,
264 	.disable_irq	= parport_sunbpp_disable_irq,
265 
266 	.data_forward	= parport_sunbpp_data_forward,
267 	.data_reverse	= parport_sunbpp_data_reverse,
268 
269 	.init_state	= parport_sunbpp_init_state,
270 	.save_state	= parport_sunbpp_save_state,
271 	.restore_state	= parport_sunbpp_restore_state,
272 
273 	.epp_write_data	= parport_ieee1284_epp_write_data,
274 	.epp_read_data	= parport_ieee1284_epp_read_data,
275 	.epp_write_addr	= parport_ieee1284_epp_write_addr,
276 	.epp_read_addr	= parport_ieee1284_epp_read_addr,
277 
278 	.ecp_write_data	= parport_ieee1284_ecp_write_data,
279 	.ecp_read_data	= parport_ieee1284_ecp_read_data,
280 	.ecp_write_addr	= parport_ieee1284_ecp_write_addr,
281 
282 	.compat_write_data	= parport_ieee1284_write_compat,
283 	.nibble_read_data	= parport_ieee1284_read_nibble,
284 	.byte_read_data		= parport_ieee1284_read_byte,
285 
286 	.owner		= THIS_MODULE,
287 };
288 
289 static int __devinit bpp_probe(struct platform_device *op, const struct of_device_id *match)
290 {
291 	struct parport_operations *ops;
292 	struct bpp_regs __iomem *regs;
293 	int irq, dma, err = 0, size;
294 	unsigned char value_tcr;
295 	void __iomem *base;
296 	struct parport *p;
297 
298 	irq = op->archdata.irqs[0];
299 	base = of_ioremap(&op->resource[0], 0,
300 			  resource_size(&op->resource[0]),
301 			  "sunbpp");
302 	if (!base)
303 		return -ENODEV;
304 
305 	size = resource_size(&op->resource[0]);
306 	dma = PARPORT_DMA_NONE;
307 
308 	ops = kmalloc(sizeof(struct parport_operations), GFP_KERNEL);
309         if (!ops)
310 		goto out_unmap;
311 
312         memcpy (ops, &parport_sunbpp_ops, sizeof(struct parport_operations));
313 
314 	dprintk(("register_port\n"));
315 	if (!(p = parport_register_port((unsigned long)base, irq, dma, ops)))
316 		goto out_free_ops;
317 
318 	p->size = size;
319 	p->dev = &op->dev;
320 
321 	if ((err = request_irq(p->irq, parport_irq_handler,
322 			       IRQF_SHARED, p->name, p)) != 0) {
323 		goto out_put_port;
324 	}
325 
326 	parport_sunbpp_enable_irq(p);
327 
328 	regs = (struct bpp_regs __iomem *)p->base;
329 
330 	value_tcr = sbus_readb(&regs->p_tcr);
331 	value_tcr &= ~P_TCR_DIR;
332 	sbus_writeb(value_tcr, &regs->p_tcr);
333 
334 	printk(KERN_INFO "%s: sunbpp at 0x%lx\n", p->name, p->base);
335 
336 	dev_set_drvdata(&op->dev, p);
337 
338 	parport_announce_port(p);
339 
340 	return 0;
341 
342 out_put_port:
343 	parport_put_port(p);
344 
345 out_free_ops:
346 	kfree(ops);
347 
348 out_unmap:
349 	of_iounmap(&op->resource[0], base, size);
350 
351 	return err;
352 }
353 
354 static int __devexit bpp_remove(struct platform_device *op)
355 {
356 	struct parport *p = dev_get_drvdata(&op->dev);
357 	struct parport_operations *ops = p->ops;
358 
359 	parport_remove_port(p);
360 
361 	if (p->irq != PARPORT_IRQ_NONE) {
362 		parport_sunbpp_disable_irq(p);
363 		free_irq(p->irq, p);
364 	}
365 
366 	of_iounmap(&op->resource[0], (void __iomem *) p->base, p->size);
367 	parport_put_port(p);
368 	kfree(ops);
369 
370 	dev_set_drvdata(&op->dev, NULL);
371 
372 	return 0;
373 }
374 
375 static const struct of_device_id bpp_match[] = {
376 	{
377 		.name = "SUNW,bpp",
378 	},
379 	{},
380 };
381 
382 MODULE_DEVICE_TABLE(of, bpp_match);
383 
384 static struct of_platform_driver bpp_sbus_driver = {
385 	.driver = {
386 		.name = "bpp",
387 		.owner = THIS_MODULE,
388 		.of_match_table = bpp_match,
389 	},
390 	.probe		= bpp_probe,
391 	.remove		= __devexit_p(bpp_remove),
392 };
393 
394 static int __init parport_sunbpp_init(void)
395 {
396 	return of_register_platform_driver(&bpp_sbus_driver);
397 }
398 
399 static void __exit parport_sunbpp_exit(void)
400 {
401 	of_unregister_platform_driver(&bpp_sbus_driver);
402 }
403 
404 MODULE_AUTHOR("Derrick J Brashear");
405 MODULE_DESCRIPTION("Parport Driver for Sparc bidirectional Port");
406 MODULE_SUPPORTED_DEVICE("Sparc Bidirectional Parallel Port");
407 MODULE_VERSION("2.0");
408 MODULE_LICENSE("GPL");
409 
410 module_init(parport_sunbpp_init)
411 module_exit(parport_sunbpp_exit)
412