1/* Low-level parallel port routines for the Amiga built-in port
2 *
3 * Author: Joerg Dorchain <joerg@dorchain.net>
4 *
5 * This is a complete rewrite of the code, but based heaviy upon the old
6 * lp_intern. code.
7 *
8 * The built-in Amiga parallel port provides one port at a fixed address
9 * with 8 bidirectional data lines (D0 - D7) and 3 bidirectional status
10 * lines (BUSY, POUT, SEL), 1 output control line /STROBE (raised automatically
11 * in hardware when the data register is accessed), and 1 input control line
12 * /ACK, able to cause an interrupt, but both not directly settable by
13 * software.
14 */
15
16#include <linux/module.h>
17#include <linux/init.h>
18#include <linux/parport.h>
19#include <linux/ioport.h>
20#include <linux/interrupt.h>
21#include <linux/platform_device.h>
22
23#include <asm/setup.h>
24#include <asm/amigahw.h>
25#include <asm/irq.h>
26#include <asm/io.h>
27#include <asm/amigaints.h>
28
29#undef DEBUG
30#ifdef DEBUG
31#define DPRINTK printk
32#else
33#define DPRINTK(x...)	do { } while (0)
34#endif
35
36
37static void amiga_write_data(struct parport *p, unsigned char data)
38{
39	DPRINTK(KERN_DEBUG "write_data %c\n",data);
40	/* Triggers also /STROBE. This behavior cannot be changed */
41	ciaa.prb = data;
42	mb();
43}
44
45static unsigned char amiga_read_data(struct parport *p)
46{
47	/* Triggers also /STROBE. This behavior cannot be changed */
48	return ciaa.prb;
49}
50
51static unsigned char control_amiga_to_pc(unsigned char control)
52{
53	return PARPORT_CONTROL_SELECT |
54	      PARPORT_CONTROL_AUTOFD | PARPORT_CONTROL_STROBE;
55	/* fake value: interrupt enable, select in, no reset,
56	no autolf, no strobe - seems to be closest the wiring diagram */
57}
58
59static void amiga_write_control(struct parport *p, unsigned char control)
60{
61	DPRINTK(KERN_DEBUG "write_control %02x\n",control);
62	/* No implementation possible */
63}
64
65static unsigned char amiga_read_control( struct parport *p)
66{
67	DPRINTK(KERN_DEBUG "read_control \n");
68	return control_amiga_to_pc(0);
69}
70
71static unsigned char amiga_frob_control( struct parport *p, unsigned char mask, unsigned char val)
72{
73	unsigned char old;
74
75	DPRINTK(KERN_DEBUG "frob_control mask %02x, value %02x\n",mask,val);
76	old = amiga_read_control(p);
77	amiga_write_control(p, (old & ~mask) ^ val);
78	return old;
79}
80
81static unsigned char status_amiga_to_pc(unsigned char status)
82{
83	unsigned char ret = PARPORT_STATUS_BUSY | PARPORT_STATUS_ACK | PARPORT_STATUS_ERROR;
84
85	if (status & 1) /* Busy */
86		ret &= ~PARPORT_STATUS_BUSY;
87	if (status & 2) /* PaperOut */
88		ret |= PARPORT_STATUS_PAPEROUT;
89	if (status & 4) /* Selected */
90		ret |= PARPORT_STATUS_SELECT;
91	/* the rest is not connected or handled autonomously in hardware */
92
93	return ret;
94}
95
96static unsigned char amiga_read_status(struct parport *p)
97{
98	unsigned char status;
99
100	status = status_amiga_to_pc(ciab.pra & 7);
101	DPRINTK(KERN_DEBUG "read_status %02x\n", status);
102	return status;
103}
104
105static void amiga_enable_irq(struct parport *p)
106{
107	enable_irq(IRQ_AMIGA_CIAA_FLG);
108}
109
110static void amiga_disable_irq(struct parport *p)
111{
112	disable_irq(IRQ_AMIGA_CIAA_FLG);
113}
114
115static void amiga_data_forward(struct parport *p)
116{
117	DPRINTK(KERN_DEBUG "forward\n");
118	ciaa.ddrb = 0xff; /* all pins output */
119	mb();
120}
121
122static void amiga_data_reverse(struct parport *p)
123{
124	DPRINTK(KERN_DEBUG "reverse\n");
125	ciaa.ddrb = 0; /* all pins input */
126	mb();
127}
128
129static void amiga_init_state(struct pardevice *dev, struct parport_state *s)
130{
131	s->u.amiga.data = 0;
132	s->u.amiga.datadir = 255;
133	s->u.amiga.status = 0;
134	s->u.amiga.statusdir = 0;
135}
136
137static void amiga_save_state(struct parport *p, struct parport_state *s)
138{
139	mb();
140	s->u.amiga.data = ciaa.prb;
141	s->u.amiga.datadir = ciaa.ddrb;
142	s->u.amiga.status = ciab.pra & 7;
143	s->u.amiga.statusdir = ciab.ddra & 7;
144	mb();
145}
146
147static void amiga_restore_state(struct parport *p, struct parport_state *s)
148{
149	mb();
150	ciaa.prb = s->u.amiga.data;
151	ciaa.ddrb = s->u.amiga.datadir;
152	ciab.pra |= (ciab.pra & 0xf8) | s->u.amiga.status;
153	ciab.ddra |= (ciab.ddra & 0xf8) | s->u.amiga.statusdir;
154	mb();
155}
156
157static struct parport_operations pp_amiga_ops = {
158	.write_data	= amiga_write_data,
159	.read_data	= amiga_read_data,
160
161	.write_control	= amiga_write_control,
162	.read_control	= amiga_read_control,
163	.frob_control	= amiga_frob_control,
164
165	.read_status	= amiga_read_status,
166
167	.enable_irq	= amiga_enable_irq,
168	.disable_irq	= amiga_disable_irq,
169
170	.data_forward	= amiga_data_forward,
171	.data_reverse	= amiga_data_reverse,
172
173	.init_state	= amiga_init_state,
174	.save_state	= amiga_save_state,
175	.restore_state	= amiga_restore_state,
176
177	.epp_write_data	= parport_ieee1284_epp_write_data,
178	.epp_read_data	= parport_ieee1284_epp_read_data,
179	.epp_write_addr	= parport_ieee1284_epp_write_addr,
180	.epp_read_addr	= parport_ieee1284_epp_read_addr,
181
182	.ecp_write_data	= parport_ieee1284_ecp_write_data,
183	.ecp_read_data	= parport_ieee1284_ecp_read_data,
184	.ecp_write_addr	= parport_ieee1284_ecp_write_addr,
185
186	.compat_write_data	= parport_ieee1284_write_compat,
187	.nibble_read_data	= parport_ieee1284_read_nibble,
188	.byte_read_data		= parport_ieee1284_read_byte,
189
190	.owner		= THIS_MODULE,
191};
192
193/* ----------- Initialisation code --------------------------------- */
194
195static int __init amiga_parallel_probe(struct platform_device *pdev)
196{
197	struct parport *p;
198	int err;
199
200	ciaa.ddrb = 0xff;
201	ciab.ddra &= 0xf8;
202	mb();
203
204	p = parport_register_port((unsigned long)&ciaa.prb, IRQ_AMIGA_CIAA_FLG,
205				   PARPORT_DMA_NONE, &pp_amiga_ops);
206	if (!p)
207		return -EBUSY;
208
209	err = request_irq(IRQ_AMIGA_CIAA_FLG, parport_irq_handler, 0, p->name,
210			  p);
211	if (err)
212		goto out_irq;
213
214	printk(KERN_INFO "%s: Amiga built-in port using irq\n", p->name);
215	/* XXX: set operating mode */
216	parport_announce_port(p);
217
218	platform_set_drvdata(pdev, p);
219
220	return 0;
221
222out_irq:
223	parport_put_port(p);
224	return err;
225}
226
227static int __exit amiga_parallel_remove(struct platform_device *pdev)
228{
229	struct parport *port = platform_get_drvdata(pdev);
230
231	parport_remove_port(port);
232	if (port->irq != PARPORT_IRQ_NONE)
233		free_irq(IRQ_AMIGA_CIAA_FLG, port);
234	parport_put_port(port);
235	return 0;
236}
237
238static struct platform_driver amiga_parallel_driver = {
239	.remove = __exit_p(amiga_parallel_remove),
240	.driver   = {
241		.name	= "amiga-parallel",
242		.owner	= THIS_MODULE,
243	},
244};
245
246module_platform_driver_probe(amiga_parallel_driver, amiga_parallel_probe);
247
248MODULE_AUTHOR("Joerg Dorchain <joerg@dorchain.net>");
249MODULE_DESCRIPTION("Parport Driver for Amiga builtin Port");
250MODULE_SUPPORTED_DEVICE("Amiga builtin Parallel Port");
251MODULE_LICENSE("GPL");
252MODULE_ALIAS("platform:amiga-parallel");
253