xref: /linux/drivers/parport/parport_sunbpp.c (revision e53524cdcc02d089e757b668da031ba06ff665c3) 
1 // SPDX-License-Identifier: GPL-2.0-only
2 /* parport_sunbpp.c: Parallel-port routines for SBUS
3  *
4  * Author: Derrick J. Brashear <shadow@dementia.org>
5  *
6  * based on work by:
7  *          Phil Blundell <philb@gnu.org>
8  *          Tim Waugh <tim@cyberelk.demon.co.uk>
9  *	    Jose Renau <renau@acm.org>
10  *          David Campbell <campbell@tirian.che.curtin.edu.au>
11  *          Grant Guenther <grant@torque.net>
12  *          Eddie C. Dost <ecd@skynet.be>
13  *          Stephen Williams (steve@icarus.com)
14  *          Gus Baldauf (gbaldauf@ix.netcom.com)
15  *          Peter Zaitcev
16  *          Tom Dyas
17  *
18  * Updated to new SBUS device framework: David S. Miller <davem@davemloft.net>
19  *
20  */
21 
22 #include <linux/string.h>
23 #include <linux/module.h>
24 #include <linux/delay.h>
25 #include <linux/errno.h>
26 #include <linux/ioport.h>
27 #include <linux/kernel.h>
28 #include <linux/slab.h>
29 #include <linux/init.h>
30 #include <linux/of.h>
31 #include <linux/of_device.h>
32 
33 #include <linux/parport.h>
34 
35 #include <asm/ptrace.h>
36 #include <linux/interrupt.h>
37 
38 #include <asm/io.h>
39 #include <asm/oplib.h>           /* OpenProm Library */
40 #include <asm/dma.h>             /* BPP uses LSI 64854 for DMA */
41 #include <asm/irq.h>
42 #include <asm/sunbpp.h>
43 
44 #undef __SUNBPP_DEBUG
45 #ifdef __SUNBPP_DEBUG
46 #define dprintk(x) printk x
47 #else
48 #define dprintk(x)
49 #endif
50 
51 static void parport_sunbpp_disable_irq(struct parport *p)
52 {
53 	struct bpp_regs __iomem *regs = (struct bpp_regs __iomem *)p->base;
54 	u32 tmp;
55 
56 	tmp = sbus_readl(&regs->p_csr);
57 	tmp &= ~DMA_INT_ENAB;
58 	sbus_writel(tmp, &regs->p_csr);
59 }
60 
61 static void parport_sunbpp_enable_irq(struct parport *p)
62 {
63 	struct bpp_regs __iomem *regs = (struct bpp_regs __iomem *)p->base;
64 	u32 tmp;
65 
66 	tmp = sbus_readl(&regs->p_csr);
67 	tmp |= DMA_INT_ENAB;
68 	sbus_writel(tmp, &regs->p_csr);
69 }
70 
71 static void parport_sunbpp_write_data(struct parport *p, unsigned char d)
72 {
73 	struct bpp_regs __iomem *regs = (struct bpp_regs __iomem *)p->base;
74 
75 	sbus_writeb(d, &regs->p_dr);
76 	dprintk((KERN_DEBUG "wrote 0x%x\n", d));
77 }
78 
79 static unsigned char parport_sunbpp_read_data(struct parport *p)
80 {
81 	struct bpp_regs __iomem *regs = (struct bpp_regs __iomem *)p->base;
82 
83 	return sbus_readb(&regs->p_dr);
84 }
85 
86 static unsigned char status_sunbpp_to_pc(struct parport *p)
87 {
88 	struct bpp_regs __iomem *regs = (struct bpp_regs __iomem *)p->base;
89 	unsigned char bits = 0;
90 	unsigned char value_tcr = sbus_readb(&regs->p_tcr);
91 	unsigned char value_ir = sbus_readb(&regs->p_ir);
92 
93 	if (!(value_ir & P_IR_ERR))
94 		bits |= PARPORT_STATUS_ERROR;
95 	if (!(value_ir & P_IR_SLCT))
96 		bits |= PARPORT_STATUS_SELECT;
97 	if (!(value_ir & P_IR_PE))
98 		bits |= PARPORT_STATUS_PAPEROUT;
99 	if (value_tcr & P_TCR_ACK)
100 		bits |= PARPORT_STATUS_ACK;
101 	if (!(value_tcr & P_TCR_BUSY))
102 		bits |= PARPORT_STATUS_BUSY;
103 
104 	dprintk((KERN_DEBUG "tcr 0x%x ir 0x%x\n", value_tcr, value_ir));
105 	dprintk((KERN_DEBUG "read status 0x%x\n", bits));
106 	return bits;
107 }
108 
109 static unsigned char control_sunbpp_to_pc(struct parport *p)
110 {
111 	struct bpp_regs __iomem *regs = (struct bpp_regs __iomem *)p->base;
112 	unsigned char bits = 0;
113 	unsigned char value_tcr = sbus_readb(&regs->p_tcr);
114 	unsigned char value_or = sbus_readb(&regs->p_or);
115 
116 	if (!(value_tcr & P_TCR_DS))
117 		bits |= PARPORT_CONTROL_STROBE;
118 	if (!(value_or & P_OR_AFXN))
119 		bits |= PARPORT_CONTROL_AUTOFD;
120 	if (!(value_or & P_OR_INIT))
121 		bits |= PARPORT_CONTROL_INIT;
122 	if (value_or & P_OR_SLCT_IN)
123 		bits |= PARPORT_CONTROL_SELECT;
124 
125 	dprintk((KERN_DEBUG "tcr 0x%x or 0x%x\n", value_tcr, value_or));
126 	dprintk((KERN_DEBUG "read control 0x%x\n", bits));
127 	return bits;
128 }
129 
130 static unsigned char parport_sunbpp_read_control(struct parport *p)
131 {
132 	return control_sunbpp_to_pc(p);
133 }
134 
135 static unsigned char parport_sunbpp_frob_control(struct parport *p,
136 						 unsigned char mask,
137 						 unsigned char val)
138 {
139 	struct bpp_regs __iomem *regs = (struct bpp_regs __iomem *)p->base;
140 	unsigned char value_tcr = sbus_readb(&regs->p_tcr);
141 	unsigned char value_or = sbus_readb(&regs->p_or);
142 
143 	dprintk((KERN_DEBUG "frob1: tcr 0x%x or 0x%x\n",
144 		 value_tcr, value_or));
145 	if (mask & PARPORT_CONTROL_STROBE) {
146 		if (val & PARPORT_CONTROL_STROBE) {
147 			value_tcr &= ~P_TCR_DS;
148 		} else {
149 			value_tcr |= P_TCR_DS;
150 		}
151 	}
152 	if (mask & PARPORT_CONTROL_AUTOFD) {
153 		if (val & PARPORT_CONTROL_AUTOFD) {
154 			value_or &= ~P_OR_AFXN;
155 		} else {
156 			value_or |= P_OR_AFXN;
157 		}
158 	}
159 	if (mask & PARPORT_CONTROL_INIT) {
160 		if (val & PARPORT_CONTROL_INIT) {
161 			value_or &= ~P_OR_INIT;
162 		} else {
163 			value_or |= P_OR_INIT;
164 		}
165 	}
166 	if (mask & PARPORT_CONTROL_SELECT) {
167 		if (val & PARPORT_CONTROL_SELECT) {
168 			value_or |= P_OR_SLCT_IN;
169 		} else {
170 			value_or &= ~P_OR_SLCT_IN;
171 		}
172 	}
173 
174 	sbus_writeb(value_or, &regs->p_or);
175 	sbus_writeb(value_tcr, &regs->p_tcr);
176 	dprintk((KERN_DEBUG "frob2: tcr 0x%x or 0x%x\n",
177 		 value_tcr, value_or));
178 	return parport_sunbpp_read_control(p);
179 }
180 
181 static void parport_sunbpp_write_control(struct parport *p, unsigned char d)
182 {
183 	const unsigned char wm = (PARPORT_CONTROL_STROBE |
184 				  PARPORT_CONTROL_AUTOFD |
185 				  PARPORT_CONTROL_INIT |
186 				  PARPORT_CONTROL_SELECT);
187 
188 	parport_sunbpp_frob_control (p, wm, d & wm);
189 }
190 
191 static unsigned char parport_sunbpp_read_status(struct parport *p)
192 {
193 	return status_sunbpp_to_pc(p);
194 }
195 
196 static void parport_sunbpp_data_forward (struct parport *p)
197 {
198 	struct bpp_regs __iomem *regs = (struct bpp_regs __iomem *)p->base;
199 	unsigned char value_tcr = sbus_readb(&regs->p_tcr);
200 
201 	dprintk((KERN_DEBUG "forward\n"));
202 	value_tcr &= ~P_TCR_DIR;
203 	sbus_writeb(value_tcr, &regs->p_tcr);
204 }
205 
206 static void parport_sunbpp_data_reverse (struct parport *p)
207 {
208 	struct bpp_regs __iomem *regs = (struct bpp_regs __iomem *)p->base;
209 	u8 val = sbus_readb(&regs->p_tcr);
210 
211 	dprintk((KERN_DEBUG "reverse\n"));
212 	val |= P_TCR_DIR;
213 	sbus_writeb(val, &regs->p_tcr);
214 }
215 
216 static void parport_sunbpp_init_state(struct pardevice *dev, struct parport_state *s)
217 {
218 	s->u.pc.ctr = 0xc;
219 	s->u.pc.ecr = 0x0;
220 }
221 
222 static void parport_sunbpp_save_state(struct parport *p, struct parport_state *s)
223 {
224 	s->u.pc.ctr = parport_sunbpp_read_control(p);
225 }
226 
227 static void parport_sunbpp_restore_state(struct parport *p, struct parport_state *s)
228 {
229 	parport_sunbpp_write_control(p, s->u.pc.ctr);
230 }
231 
232 static struct parport_operations parport_sunbpp_ops =
233 {
234 	.write_data	= parport_sunbpp_write_data,
235 	.read_data	= parport_sunbpp_read_data,
236 
237 	.write_control	= parport_sunbpp_write_control,
238 	.read_control	= parport_sunbpp_read_control,
239 	.frob_control	= parport_sunbpp_frob_control,
240 
241 	.read_status	= parport_sunbpp_read_status,
242 
243 	.enable_irq	= parport_sunbpp_enable_irq,
244 	.disable_irq	= parport_sunbpp_disable_irq,
245 
246 	.data_forward	= parport_sunbpp_data_forward,
247 	.data_reverse	= parport_sunbpp_data_reverse,
248 
249 	.init_state	= parport_sunbpp_init_state,
250 	.save_state	= parport_sunbpp_save_state,
251 	.restore_state	= parport_sunbpp_restore_state,
252 
253 	.epp_write_data	= parport_ieee1284_epp_write_data,
254 	.epp_read_data	= parport_ieee1284_epp_read_data,
255 	.epp_write_addr	= parport_ieee1284_epp_write_addr,
256 	.epp_read_addr	= parport_ieee1284_epp_read_addr,
257 
258 	.ecp_write_data	= parport_ieee1284_ecp_write_data,
259 	.ecp_read_data	= parport_ieee1284_ecp_read_data,
260 	.ecp_write_addr	= parport_ieee1284_ecp_write_addr,
261 
262 	.compat_write_data	= parport_ieee1284_write_compat,
263 	.nibble_read_data	= parport_ieee1284_read_nibble,
264 	.byte_read_data		= parport_ieee1284_read_byte,
265 
266 	.owner		= THIS_MODULE,
267 };
268 
269 static int bpp_probe(struct platform_device *op)
270 {
271 	struct parport_operations *ops;
272 	struct bpp_regs __iomem *regs;
273 	int irq, dma, err = 0, size;
274 	unsigned char value_tcr;
275 	void __iomem *base;
276 	struct parport *p;
277 
278 	irq = op->archdata.irqs[0];
279 	base = of_ioremap(&op->resource[0], 0,
280 			  resource_size(&op->resource[0]),
281 			  "sunbpp");
282 	if (!base)
283 		return -ENODEV;
284 
285 	size = resource_size(&op->resource[0]);
286 	dma = PARPORT_DMA_NONE;
287 
288 	ops = kmemdup(&parport_sunbpp_ops, sizeof(struct parport_operations),
289 		      GFP_KERNEL);
290 	if (!ops) {
291 		err = -ENOMEM;
292 		goto out_unmap;
293 	}
294 
295 	dprintk(("register_port\n"));
296 	if (!(p = parport_register_port((unsigned long)base, irq, dma, ops))) {
297 		err = -ENOMEM;
298 		goto out_free_ops;
299 	}
300 
301 	p->size = size;
302 	p->dev = &op->dev;
303 
304 	if ((err = request_irq(p->irq, parport_irq_handler,
305 			       IRQF_SHARED, p->name, p)) != 0) {
306 		goto out_put_port;
307 	}
308 
309 	parport_sunbpp_enable_irq(p);
310 
311 	regs = (struct bpp_regs __iomem *)p->base;
312 
313 	value_tcr = sbus_readb(&regs->p_tcr);
314 	value_tcr &= ~P_TCR_DIR;
315 	sbus_writeb(value_tcr, &regs->p_tcr);
316 
317 	pr_info("%s: sunbpp at 0x%lx\n", p->name, p->base);
318 
319 	dev_set_drvdata(&op->dev, p);
320 
321 	parport_announce_port(p);
322 
323 	return 0;
324 
325 out_put_port:
326 	parport_put_port(p);
327 
328 out_free_ops:
329 	kfree(ops);
330 
331 out_unmap:
332 	of_iounmap(&op->resource[0], base, size);
333 
334 	return err;
335 }
336 
337 static int bpp_remove(struct platform_device *op)
338 {
339 	struct parport *p = dev_get_drvdata(&op->dev);
340 	struct parport_operations *ops = p->ops;
341 
342 	parport_remove_port(p);
343 
344 	if (p->irq != PARPORT_IRQ_NONE) {
345 		parport_sunbpp_disable_irq(p);
346 		free_irq(p->irq, p);
347 	}
348 
349 	of_iounmap(&op->resource[0], (void __iomem *) p->base, p->size);
350 	parport_put_port(p);
351 	kfree(ops);
352 
353 	dev_set_drvdata(&op->dev, NULL);
354 
355 	return 0;
356 }
357 
358 static const struct of_device_id bpp_match[] = {
359 	{
360 		.name = "SUNW,bpp",
361 	},
362 	{},
363 };
364 
365 MODULE_DEVICE_TABLE(of, bpp_match);
366 
367 static struct platform_driver bpp_sbus_driver = {
368 	.driver = {
369 		.name = "bpp",
370 		.of_match_table = bpp_match,
371 	},
372 	.probe		= bpp_probe,
373 	.remove		= bpp_remove,
374 };
375 
376 module_platform_driver(bpp_sbus_driver);
377 
378 MODULE_AUTHOR("Derrick J Brashear");
379 MODULE_DESCRIPTION("Parport Driver for Sparc bidirectional Port");
380 MODULE_VERSION("2.0");
381 MODULE_LICENSE("GPL");
382