aboutsummaryrefslogtreecommitdiffstats
path: root/drivers/parport/parport_amiga.c
blob: 26ecdea84fb511373fc8a0922f7afc3dd45ddc18 (plain) (blame)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
/* Low-level parallel port routines for the Amiga built-in port
 *
 * Author: Joerg Dorchain <joerg@dorchain.net>
 *
 * This is a complete rewrite of the code, but based heaviy upon the old
 * lp_intern. code.
 *
 * The built-in Amiga parallel port provides one port at a fixed address
 * with 8 bidirectional data lines (D0 - D7) and 3 bidirectional status
 * lines (BUSY, POUT, SEL), 1 output control line /STROBE (raised automatically
 * in hardware when the data register is accessed), and 1 input control line
 * /ACK, able to cause an interrupt, but both not directly settable by
 * software.
 */

#include <linux/module.h>
#include <linux/init.h>
#include <linux/parport.h>
#include <linux/ioport.h>
#include <linux/interrupt.h>
#include <linux/platform_device.h>

#include <asm/setup.h>
#include <asm/amigahw.h>
#include <asm/irq.h>
#include <asm/io.h>
#include <asm/amigaints.h>

#undef DEBUG
#ifdef DEBUG
#define DPRINTK printk
#else
#define DPRINTK(x...)	do { } while (0)
#endif


static void amiga_write_data(struct parport *p, unsigned char data)
{
	DPRINTK(KERN_DEBUG "write_data %c\n",data);
	/* Triggers also /STROBE. This behavior cannot be changed */
	ciaa.prb = data;
	mb();
}

static unsigned char amiga_read_data(struct parport *p)
{
	/* Triggers also /STROBE. This behavior cannot be changed */
	return ciaa.prb;
}

static unsigned char control_amiga_to_pc(unsigned char control)
{
	return PARPORT_CONTROL_SELECT |
	      PARPORT_CONTROL_AUTOFD | PARPORT_CONTROL_STROBE;
	/* fake value: interrupt enable, select in, no reset,
	no autolf, no strobe - seems to be closest the wiring diagram */
}

static void amiga_write_control(struct parport *p, unsigned char control)
{
	DPRINTK(KERN_DEBUG "write_control %02x\n",control);
	/* No implementation possible */
}
	
static unsigned char amiga_read_control( struct parport *p)
{
	DPRINTK(KERN_DEBUG "read_control \n");
	return control_amiga_to_pc(0);
}

static unsigned char amiga_frob_control( struct parport *p, unsigned char mask, unsigned char val)
{
	unsigned char old;

	DPRINTK(KERN_DEBUG "frob_control mask %02x, value %02x\n",mask,val);
	old = amiga_read_control(p);
	amiga_write_control(p, (old & ~mask) ^ val);
	return old;
}

static unsigned char status_amiga_to_pc(unsigned char status)
{
	unsigned char ret = PARPORT_STATUS_BUSY | PARPORT_STATUS_ACK | PARPORT_STATUS_ERROR;

	if (status & 1) /* Busy */
		ret &= ~PARPORT_STATUS_BUSY;
	if (status & 2) /* PaperOut */
		ret |= PARPORT_STATUS_PAPEROUT;
	if (status & 4) /* Selected */
		ret |= PARPORT_STATUS_SELECT;
	/* the rest is not connected or handled autonomously in hardware */

	return ret;
}

static unsigned char amiga_read_status(struct parport *p)
{
	unsigned char status;

	status = status_amiga_to_pc(ciab.pra & 7);
	DPRINTK(KERN_DEBUG "read_status %02x\n", status);
	return status;
}

static void amiga_enable_irq(struct parport *p)
{
	enable_irq(IRQ_AMIGA_CIAA_FLG);
}

static void amiga_disable_irq(struct parport *p)
{
	disable_irq(IRQ_AMIGA_CIAA_FLG);
}

static void amiga_data_forward(struct parport *p)
{
	DPRINTK(KERN_DEBUG "forward\n");
	ciaa.ddrb = 0xff; /* all pins output */
	mb();
}

static void amiga_data_reverse(struct parport *p)
{
	DPRINTK(KERN_DEBUG "reverse\n");
	ciaa.ddrb = 0; /* all pins input */
	mb();
}

static void amiga_init_state(struct pardevice *dev, struct parport_state *s)
{
	s->u.amiga.data = 0;
	s->u.amiga.datadir = 255;
	s->u.amiga.status = 0;
	s->u.amiga.statusdir = 0;
}

static void amiga_save_state(struct parport *p, struct parport_state *s)
{
	mb();
	s->u.amiga.data = ciaa.prb;
	s->u.amiga.datadir = ciaa.ddrb;
	s->u.amiga.status = ciab.pra & 7;
	s->u.amiga.statusdir = ciab.ddra & 7;
	mb();
}

static void amiga_restore_state(struct parport *p, struct parport_state *s)
{
	mb();
	ciaa.prb = s->u.amiga.data;
	ciaa.ddrb = s->u.amiga.datadir;
	ciab.pra |= (ciab.pra & 0xf8) | s->u.amiga.status;
	ciab.ddra |= (ciab.ddra & 0xf8) | s->u.amiga.statusdir;
	mb();
}

static struct parport_operations pp_amiga_ops = {
	.write_data	= amiga_write_data,
	.read_data	= amiga_read_data,

	.write_control	= amiga_write_control,
	.read_control	= amiga_read_control,
	.frob_control	= amiga_frob_control,

	.read_status	= amiga_read_status,

	.enable_irq	= amiga_enable_irq,
	.disable_irq	= amiga_disable_irq,

	.data_forward	= amiga_data_forward,
	.data_reverse	= amiga_data_reverse,

	.init_state	= amiga_init_state,
	.save_state	= amiga_save_state,
	.restore_state	= amiga_restore_state,

	.epp_write_data	= parport_ieee1284_epp_write_data,
	.epp_read_data	= parport_ieee1284_epp_read_data,
	.epp_write_addr	= parport_ieee1284_epp_write_addr,
	.epp_read_addr	= parport_ieee1284_epp_read_addr,

	.ecp_write_data	= parport_ieee1284_ecp_write_data,
	.ecp_read_data	= parport_ieee1284_ecp_read_data,
	.ecp_write_addr	= parport_ieee1284_ecp_write_addr,

	.compat_write_data	= parport_ieee1284_write_compat,
	.nibble_read_data	= parport_ieee1284_read_nibble,
	.byte_read_data		= parport_ieee1284_read_byte,

	.owner		= THIS_MODULE,
};

/* ----------- Initialisation code --------------------------------- */

static int __init amiga_parallel_probe(struct platform_device *pdev)
{
	struct parport *p;
	int err;

	ciaa.ddrb = 0xff;
	ciab.ddra &= 0xf8;
	mb();

	p = parport_register_port((unsigned long)&ciaa.prb, IRQ_AMIGA_CIAA_FLG,
				   PARPORT_DMA_NONE, &pp_amiga_ops);
	if (!p)
		return -EBUSY;

	err = request_irq(IRQ_AMIGA_CIAA_FLG, parport_irq_handler, 0, p->name,
			  p);
	if (err)
		goto out_irq;

	printk(KERN_INFO "%s: Amiga built-in port using irq\n", p->name);
	/* XXX: set operating mode */
	parport_announce_port(p);

	platform_set_drvdata(pdev, p);

	return 0;

out_irq:
	parport_put_port(p);
	return err;
}

static int __exit amiga_parallel_remove(struct platform_device *pdev)
{
	struct parport *port = platform_get_drvdata(pdev);

	parport_remove_port(port);
	if (port->irq != PARPORT_IRQ_NONE)
		free_irq(IRQ_AMIGA_CIAA_FLG, port);
	parport_put_port(port);
	return 0;
}

static struct platform_driver amiga_parallel_driver = {
	.remove = __exit_p(amiga_parallel_remove),
	.driver   = {
		.name	= "amiga-parallel",
		.owner	= THIS_MODULE,
	},
};

module_platform_driver_probe(amiga_parallel_driver, amiga_parallel_probe);

MODULE_AUTHOR("Joerg Dorchain <joerg@dorchain.net>");
MODULE_DESCRIPTION("Parport Driver for Amiga builtin Port");
MODULE_SUPPORTED_DEVICE("Amiga builtin Parallel Port");
MODULE_LICENSE("GPL");
MODULE_ALIAS("platform:amiga-parallel");