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Linus Torvalds1da177e2005-04-16 15:20:36 -07001/* 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 <asm/setup.h>
22#include <asm/amigahw.h>
23#include <asm/irq.h>
24#include <asm/io.h>
25#include <asm/amigaints.h>
26
27#undef DEBUG
28#ifdef DEBUG
29#define DPRINTK printk
30#else
31#define DPRINTK(x...) do { } while (0)
32#endif
33
34static struct parport *this_port = NULL;
35
36static void amiga_write_data(struct parport *p, unsigned char data)
37{
38 DPRINTK(KERN_DEBUG "write_data %c\n",data);
39 /* Triggers also /STROBE. This behavior cannot be changed */
40 ciaa.prb = data;
41 mb();
42}
43
44static unsigned char amiga_read_data(struct parport *p)
45{
46 /* Triggers also /STROBE. This behavior cannot be changed */
47 return ciaa.prb;
48}
49
50#if 0
51static unsigned char control_pc_to_amiga(unsigned char control)
52{
53 unsigned char ret = 0;
54
55 if (control & PARPORT_CONTROL_SELECT) /* XXX: What is SELECP? */
56 ;
57 if (control & PARPORT_CONTROL_INIT) /* INITP */
58 /* reset connected to cpu reset pin */;
59 if (control & PARPORT_CONTROL_AUTOFD) /* AUTOLF */
60 /* Not connected */;
61 if (control & PARPORT_CONTROL_STROBE) /* Strobe */
62 /* Handled only directly by hardware */;
63 return ret;
64}
65#endif
66
67static unsigned char control_amiga_to_pc(unsigned char control)
68{
69 return PARPORT_CONTROL_SELECT |
70 PARPORT_CONTROL_AUTOFD | PARPORT_CONTROL_STROBE;
71 /* fake value: interrupt enable, select in, no reset,
72 no autolf, no strobe - seems to be closest the wiring diagram */
73}
74
75static void amiga_write_control(struct parport *p, unsigned char control)
76{
77 DPRINTK(KERN_DEBUG "write_control %02x\n",control);
78 /* No implementation possible */
79}
80
81static unsigned char amiga_read_control( struct parport *p)
82{
83 DPRINTK(KERN_DEBUG "read_control \n");
84 return control_amiga_to_pc(0);
85}
86
87static unsigned char amiga_frob_control( struct parport *p, unsigned char mask, unsigned char val)
88{
89 unsigned char old;
90
91 DPRINTK(KERN_DEBUG "frob_control mask %02x, value %02x\n",mask,val);
92 old = amiga_read_control(p);
93 amiga_write_control(p, (old & ~mask) ^ val);
94 return old;
95}
96
97#if 0 /* currently unused */
98static unsigned char status_pc_to_amiga(unsigned char status)
99{
100 unsigned char ret = 1;
101
102 if (status & PARPORT_STATUS_BUSY) /* Busy */
103 ret &= ~1;
104 if (status & PARPORT_STATUS_ACK) /* Ack */
105 /* handled in hardware */;
106 if (status & PARPORT_STATUS_PAPEROUT) /* PaperOut */
107 ret |= 2;
108 if (status & PARPORT_STATUS_SELECT) /* select */
109 ret |= 4;
110 if (status & PARPORT_STATUS_ERROR) /* error */
111 /* not connected */;
112 return ret;
113}
114#endif
115
116static unsigned char status_amiga_to_pc(unsigned char status)
117{
118 unsigned char ret = PARPORT_STATUS_BUSY | PARPORT_STATUS_ACK | PARPORT_STATUS_ERROR;
119
120 if (status & 1) /* Busy */
121 ret &= ~PARPORT_STATUS_BUSY;
122 if (status & 2) /* PaperOut */
123 ret |= PARPORT_STATUS_PAPEROUT;
124 if (status & 4) /* Selected */
125 ret |= PARPORT_STATUS_SELECT;
126 /* the rest is not connected or handled autonomously in hardware */
127
128 return ret;
129}
130
131static unsigned char amiga_read_status(struct parport *p)
132{
133 unsigned char status;
134
135 status = status_amiga_to_pc(ciab.pra & 7);
136 DPRINTK(KERN_DEBUG "read_status %02x\n", status);
137 return status;
138}
139
140/* as this ports irq handling is already done, we use a generic funktion */
David Howells7d12e782006-10-05 14:55:46 +0100141static irqreturn_t amiga_interrupt(int irq, void *dev_id)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700142{
David Howells7d12e782006-10-05 14:55:46 +0100143 parport_generic_irq(irq, (struct parport *) dev_id);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700144 return IRQ_HANDLED;
145}
146
147static void amiga_enable_irq(struct parport *p)
148{
149 enable_irq(IRQ_AMIGA_CIAA_FLG);
150}
151
152static void amiga_disable_irq(struct parport *p)
153{
154 disable_irq(IRQ_AMIGA_CIAA_FLG);
155}
156
157static void amiga_data_forward(struct parport *p)
158{
159 DPRINTK(KERN_DEBUG "forward\n");
160 ciaa.ddrb = 0xff; /* all pins output */
161 mb();
162}
163
164static void amiga_data_reverse(struct parport *p)
165{
166 DPRINTK(KERN_DEBUG "reverse\n");
167 ciaa.ddrb = 0; /* all pins input */
168 mb();
169}
170
171static void amiga_init_state(struct pardevice *dev, struct parport_state *s)
172{
173 s->u.amiga.data = 0;
174 s->u.amiga.datadir = 255;
175 s->u.amiga.status = 0;
176 s->u.amiga.statusdir = 0;
177}
178
179static void amiga_save_state(struct parport *p, struct parport_state *s)
180{
181 mb();
182 s->u.amiga.data = ciaa.prb;
183 s->u.amiga.datadir = ciaa.ddrb;
184 s->u.amiga.status = ciab.pra & 7;
185 s->u.amiga.statusdir = ciab.ddra & 7;
186 mb();
187}
188
189static void amiga_restore_state(struct parport *p, struct parport_state *s)
190{
191 mb();
192 ciaa.prb = s->u.amiga.data;
193 ciaa.ddrb = s->u.amiga.datadir;
194 ciab.pra |= (ciab.pra & 0xf8) | s->u.amiga.status;
195 ciab.ddra |= (ciab.ddra & 0xf8) | s->u.amiga.statusdir;
196 mb();
197}
198
199static struct parport_operations pp_amiga_ops = {
200 .write_data = amiga_write_data,
201 .read_data = amiga_read_data,
202
203 .write_control = amiga_write_control,
204 .read_control = amiga_read_control,
205 .frob_control = amiga_frob_control,
206
207 .read_status = amiga_read_status,
208
209 .enable_irq = amiga_enable_irq,
210 .disable_irq = amiga_disable_irq,
211
212 .data_forward = amiga_data_forward,
213 .data_reverse = amiga_data_reverse,
214
215 .init_state = amiga_init_state,
216 .save_state = amiga_save_state,
217 .restore_state = amiga_restore_state,
218
219 .epp_write_data = parport_ieee1284_epp_write_data,
220 .epp_read_data = parport_ieee1284_epp_read_data,
221 .epp_write_addr = parport_ieee1284_epp_write_addr,
222 .epp_read_addr = parport_ieee1284_epp_read_addr,
223
224 .ecp_write_data = parport_ieee1284_ecp_write_data,
225 .ecp_read_data = parport_ieee1284_ecp_read_data,
226 .ecp_write_addr = parport_ieee1284_ecp_write_addr,
227
228 .compat_write_data = parport_ieee1284_write_compat,
229 .nibble_read_data = parport_ieee1284_read_nibble,
230 .byte_read_data = parport_ieee1284_read_byte,
231
232 .owner = THIS_MODULE,
233};
234
235/* ----------- Initialisation code --------------------------------- */
236
237static int __init parport_amiga_init(void)
238{
239 struct parport *p;
240 int err;
241
242 if (!MACH_IS_AMIGA || !AMIGAHW_PRESENT(AMI_PARALLEL))
243 return -ENODEV;
244
245 err = -EBUSY;
246 if (!request_mem_region(CIAA_PHYSADDR-1+0x100, 0x100, "parallel"))
247 goto out_mem;
248
249 ciaa.ddrb = 0xff;
250 ciab.ddra &= 0xf8;
251 mb();
252
253 p = parport_register_port((unsigned long)&ciaa.prb, IRQ_AMIGA_CIAA_FLG,
254 PARPORT_DMA_NONE, &pp_amiga_ops);
255 if (!p)
256 goto out_port;
257
258 err = request_irq(IRQ_AMIGA_CIAA_FLG, amiga_interrupt, 0, p->name, p);
259 if (err)
260 goto out_irq;
261
262 this_port = p;
263 printk(KERN_INFO "%s: Amiga built-in port using irq\n", p->name);
264 /* XXX: set operating mode */
265 parport_announce_port(p);
266
267 return 0;
268
269out_irq:
270 parport_put_port(p);
271out_port:
272 release_mem_region(CIAA_PHYSADDR-1+0x100, 0x100);
273out_mem:
274 return err;
275}
276
277static void __exit parport_amiga_exit(void)
278{
279 parport_remove_port(this_port);
280 if (this_port->irq != PARPORT_IRQ_NONE)
281 free_irq(IRQ_AMIGA_CIAA_FLG, this_port);
282 parport_put_port(this_port);
283 release_mem_region(CIAA_PHYSADDR-1+0x100, 0x100);
284}
285
286
287MODULE_AUTHOR("Joerg Dorchain <joerg@dorchain.net>");
288MODULE_DESCRIPTION("Parport Driver for Amiga builtin Port");
289MODULE_SUPPORTED_DEVICE("Amiga builtin Parallel Port");
290MODULE_LICENSE("GPL");
291
292module_init(parport_amiga_init)
293module_exit(parport_amiga_exit)