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 <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
34 static struct parport *this_port = NULL;
35
36 static 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
44 static 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
51 static 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
67 static 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
75 static 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
81 static 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
87 static 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 */
98 static 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
116 static 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
131 static 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 static void amiga_enable_irq(struct parport *p)
141 {
142 enable_irq(IRQ_AMIGA_CIAA_FLG);
143 }
144
145 static void amiga_disable_irq(struct parport *p)
146 {
147 disable_irq(IRQ_AMIGA_CIAA_FLG);
148 }
149
150 static void amiga_data_forward(struct parport *p)
151 {
152 DPRINTK(KERN_DEBUG "forward\n");
153 ciaa.ddrb = 0xff; /* all pins output */
154 mb();
155 }
156
157 static void amiga_data_reverse(struct parport *p)
158 {
159 DPRINTK(KERN_DEBUG "reverse\n");
160 ciaa.ddrb = 0; /* all pins input */
161 mb();
162 }
163
164 static void amiga_init_state(struct pardevice *dev, struct parport_state *s)
165 {
166 s->u.amiga.data = 0;
167 s->u.amiga.datadir = 255;
168 s->u.amiga.status = 0;
169 s->u.amiga.statusdir = 0;
170 }
171
172 static void amiga_save_state(struct parport *p, struct parport_state *s)
173 {
174 mb();
175 s->u.amiga.data = ciaa.prb;
176 s->u.amiga.datadir = ciaa.ddrb;
177 s->u.amiga.status = ciab.pra & 7;
178 s->u.amiga.statusdir = ciab.ddra & 7;
179 mb();
180 }
181
182 static void amiga_restore_state(struct parport *p, struct parport_state *s)
183 {
184 mb();
185 ciaa.prb = s->u.amiga.data;
186 ciaa.ddrb = s->u.amiga.datadir;
187 ciab.pra |= (ciab.pra & 0xf8) | s->u.amiga.status;
188 ciab.ddra |= (ciab.ddra & 0xf8) | s->u.amiga.statusdir;
189 mb();
190 }
191
192 static struct parport_operations pp_amiga_ops = {
193 .write_data = amiga_write_data,
194 .read_data = amiga_read_data,
195
196 .write_control = amiga_write_control,
197 .read_control = amiga_read_control,
198 .frob_control = amiga_frob_control,
199
200 .read_status = amiga_read_status,
201
202 .enable_irq = amiga_enable_irq,
203 .disable_irq = amiga_disable_irq,
204
205 .data_forward = amiga_data_forward,
206 .data_reverse = amiga_data_reverse,
207
208 .init_state = amiga_init_state,
209 .save_state = amiga_save_state,
210 .restore_state = amiga_restore_state,
211
212 .epp_write_data = parport_ieee1284_epp_write_data,
213 .epp_read_data = parport_ieee1284_epp_read_data,
214 .epp_write_addr = parport_ieee1284_epp_write_addr,
215 .epp_read_addr = parport_ieee1284_epp_read_addr,
216
217 .ecp_write_data = parport_ieee1284_ecp_write_data,
218 .ecp_read_data = parport_ieee1284_ecp_read_data,
219 .ecp_write_addr = parport_ieee1284_ecp_write_addr,
220
221 .compat_write_data = parport_ieee1284_write_compat,
222 .nibble_read_data = parport_ieee1284_read_nibble,
223 .byte_read_data = parport_ieee1284_read_byte,
224
225 .owner = THIS_MODULE,
226 };
227
228 /* ----------- Initialisation code --------------------------------- */
229
230 static int __init parport_amiga_init(void)
231 {
232 struct parport *p;
233 int err;
234
235 if (!MACH_IS_AMIGA || !AMIGAHW_PRESENT(AMI_PARALLEL))
236 return -ENODEV;
237
238 err = -EBUSY;
239 if (!request_mem_region(CIAA_PHYSADDR-1+0x100, 0x100, "parallel"))
240 goto out_mem;
241
242 ciaa.ddrb = 0xff;
243 ciab.ddra &= 0xf8;
244 mb();
245
246 p = parport_register_port((unsigned long)&ciaa.prb, IRQ_AMIGA_CIAA_FLG,
247 PARPORT_DMA_NONE, &pp_amiga_ops);
248 if (!p)
249 goto out_port;
250
251 err = request_irq(IRQ_AMIGA_CIAA_FLG, parport_irq_handler, 0, p->name, p);
252 if (err)
253 goto out_irq;
254
255 this_port = p;
256 printk(KERN_INFO "%s: Amiga built-in port using irq\n", p->name);
257 /* XXX: set operating mode */
258 parport_announce_port(p);
259
260 return 0;
261
262 out_irq:
263 parport_put_port(p);
264 out_port:
265 release_mem_region(CIAA_PHYSADDR-1+0x100, 0x100);
266 out_mem:
267 return err;
268 }
269
270 static void __exit parport_amiga_exit(void)
271 {
272 parport_remove_port(this_port);
273 if (this_port->irq != PARPORT_IRQ_NONE)
274 free_irq(IRQ_AMIGA_CIAA_FLG, this_port);
275 parport_put_port(this_port);
276 release_mem_region(CIAA_PHYSADDR-1+0x100, 0x100);
277 }
278
279
280 MODULE_AUTHOR("Joerg Dorchain <joerg@dorchain.net>");
281 MODULE_DESCRIPTION("Parport Driver for Amiga builtin Port");
282 MODULE_SUPPORTED_DEVICE("Amiga builtin Parallel Port");
283 MODULE_LICENSE("GPL");
284
285 module_init(parport_amiga_init)
286 module_exit(parport_amiga_exit)
287
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