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
50static 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
60static 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
70static 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
78static 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
85static 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
108static 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
129static unsigned char parport_sunbpp_read_control(struct parport *p)
130{
131	return control_sunbpp_to_pc(p);
132}
133
134static 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
180static 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
190static unsigned char parport_sunbpp_read_status(struct parport *p)
191{
192	return status_sunbpp_to_pc(p);
193}
194
195static 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
205static 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
215static 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
221static 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
226static 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
231static 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
268static 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
320out_put_port:
321	parport_put_port(p);
322
323out_free_ops:
324	kfree(ops);
325
326out_unmap:
327	of_iounmap(&op->resource[0], base, size);
328
329	return err;
330}
331
332static 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
353static const struct of_device_id bpp_match[] = {
354	{
355		.name = "SUNW,bpp",
356	},
357	{},
358};
359
360MODULE_DEVICE_TABLE(of, bpp_match);
361
362static 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
371module_platform_driver(bpp_sbus_driver);
372
373MODULE_AUTHOR("Derrick J Brashear");
374MODULE_DESCRIPTION("Parport Driver for Sparc bidirectional Port");
375MODULE_SUPPORTED_DEVICE("Sparc Bidirectional Parallel Port");
376MODULE_VERSION("2.0");
377MODULE_LICENSE("GPL");
378