xref: /linux/drivers/parport/parport_sunbpp.c (revision a13d7201d7deedcbb6ac6efa94a1a7d34d3d79ec) 
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 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 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 = kmemdup(&parport_sunbpp_ops, sizeof(struct parport_operations),
288 		      GFP_KERNEL);
289         if (!ops)
290 		goto out_unmap;
291 
292 	dprintk(("register_port\n"));
293 	if (!(p = parport_register_port((unsigned long)base, irq, dma, ops)))
294 		goto out_free_ops;
295 
296 	p->size = size;
297 	p->dev = &op->dev;
298 
299 	if ((err = request_irq(p->irq, parport_irq_handler,
300 			       IRQF_SHARED, p->name, p)) != 0) {
301 		goto out_put_port;
302 	}
303 
304 	parport_sunbpp_enable_irq(p);
305 
306 	regs = (struct bpp_regs __iomem *)p->base;
307 
308 	value_tcr = sbus_readb(&regs->p_tcr);
309 	value_tcr &= ~P_TCR_DIR;
310 	sbus_writeb(value_tcr, &regs->p_tcr);
311 
312 	printk(KERN_INFO "%s: sunbpp at 0x%lx\n", p->name, p->base);
313 
314 	dev_set_drvdata(&op->dev, p);
315 
316 	parport_announce_port(p);
317 
318 	return 0;
319 
320 out_put_port:
321 	parport_put_port(p);
322 
323 out_free_ops:
324 	kfree(ops);
325 
326 out_unmap:
327 	of_iounmap(&op->resource[0], base, size);
328 
329 	return err;
330 }
331 
332 static int bpp_remove(struct platform_device *op)
333 {
334 	struct parport *p = dev_get_drvdata(&op->dev);
335 	struct parport_operations *ops = p->ops;
336 
337 	parport_remove_port(p);
338 
339 	if (p->irq != PARPORT_IRQ_NONE) {
340 		parport_sunbpp_disable_irq(p);
341 		free_irq(p->irq, p);
342 	}
343 
344 	of_iounmap(&op->resource[0], (void __iomem *) p->base, p->size);
345 	parport_put_port(p);
346 	kfree(ops);
347 
348 	dev_set_drvdata(&op->dev, NULL);
349 
350 	return 0;
351 }
352 
353 static const struct of_device_id bpp_match[] = {
354 	{
355 		.name = "SUNW,bpp",
356 	},
357 	{},
358 };
359 
360 MODULE_DEVICE_TABLE(of, bpp_match);
361 
362 static struct platform_driver bpp_sbus_driver = {
363 	.driver = {
364 		.name = "bpp",
365 		.of_match_table = bpp_match,
366 	},
367 	.probe		= bpp_probe,
368 	.remove		= bpp_remove,
369 };
370 
371 module_platform_driver(bpp_sbus_driver);
372 
373 MODULE_AUTHOR("Derrick J Brashear");
374 MODULE_DESCRIPTION("Parport Driver for Sparc bidirectional Port");
375 MODULE_SUPPORTED_DEVICE("Sparc Bidirectional Parallel Port");
376 MODULE_VERSION("2.0");
377 MODULE_LICENSE("GPL");
378