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1da177e4 LT |
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> | |
6f8221c2 GU |
21 | #include <linux/platform_device.h> |
22 | ||
1da177e4 LT |
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 | ||
1da177e4 LT |
36 | |
37 | static 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 | ||
45 | static unsigned char amiga_read_data(struct parport *p) | |
46 | { | |
47 | /* Triggers also /STROBE. This behavior cannot be changed */ | |
48 | return ciaa.prb; | |
49 | } | |
50 | ||
51 | #if 0 | |
52 | static unsigned char control_pc_to_amiga(unsigned char control) | |
53 | { | |
54 | unsigned char ret = 0; | |
55 | ||
56 | if (control & PARPORT_CONTROL_SELECT) /* XXX: What is SELECP? */ | |
57 | ; | |
58 | if (control & PARPORT_CONTROL_INIT) /* INITP */ | |
59 | /* reset connected to cpu reset pin */; | |
60 | if (control & PARPORT_CONTROL_AUTOFD) /* AUTOLF */ | |
61 | /* Not connected */; | |
62 | if (control & PARPORT_CONTROL_STROBE) /* Strobe */ | |
63 | /* Handled only directly by hardware */; | |
64 | return ret; | |
65 | } | |
66 | #endif | |
67 | ||
68 | static unsigned char control_amiga_to_pc(unsigned char control) | |
69 | { | |
70 | return PARPORT_CONTROL_SELECT | | |
71 | PARPORT_CONTROL_AUTOFD | PARPORT_CONTROL_STROBE; | |
72 | /* fake value: interrupt enable, select in, no reset, | |
73 | no autolf, no strobe - seems to be closest the wiring diagram */ | |
74 | } | |
75 | ||
76 | static void amiga_write_control(struct parport *p, unsigned char control) | |
77 | { | |
78 | DPRINTK(KERN_DEBUG "write_control %02x\n",control); | |
79 | /* No implementation possible */ | |
80 | } | |
81 | ||
82 | static unsigned char amiga_read_control( struct parport *p) | |
83 | { | |
84 | DPRINTK(KERN_DEBUG "read_control \n"); | |
85 | return control_amiga_to_pc(0); | |
86 | } | |
87 | ||
88 | static unsigned char amiga_frob_control( struct parport *p, unsigned char mask, unsigned char val) | |
89 | { | |
90 | unsigned char old; | |
91 | ||
92 | DPRINTK(KERN_DEBUG "frob_control mask %02x, value %02x\n",mask,val); | |
93 | old = amiga_read_control(p); | |
94 | amiga_write_control(p, (old & ~mask) ^ val); | |
95 | return old; | |
96 | } | |
97 | ||
98 | #if 0 /* currently unused */ | |
99 | static unsigned char status_pc_to_amiga(unsigned char status) | |
100 | { | |
101 | unsigned char ret = 1; | |
102 | ||
103 | if (status & PARPORT_STATUS_BUSY) /* Busy */ | |
104 | ret &= ~1; | |
105 | if (status & PARPORT_STATUS_ACK) /* Ack */ | |
106 | /* handled in hardware */; | |
107 | if (status & PARPORT_STATUS_PAPEROUT) /* PaperOut */ | |
108 | ret |= 2; | |
109 | if (status & PARPORT_STATUS_SELECT) /* select */ | |
110 | ret |= 4; | |
111 | if (status & PARPORT_STATUS_ERROR) /* error */ | |
112 | /* not connected */; | |
113 | return ret; | |
114 | } | |
115 | #endif | |
116 | ||
117 | static unsigned char status_amiga_to_pc(unsigned char status) | |
118 | { | |
119 | unsigned char ret = PARPORT_STATUS_BUSY | PARPORT_STATUS_ACK | PARPORT_STATUS_ERROR; | |
120 | ||
121 | if (status & 1) /* Busy */ | |
122 | ret &= ~PARPORT_STATUS_BUSY; | |
123 | if (status & 2) /* PaperOut */ | |
124 | ret |= PARPORT_STATUS_PAPEROUT; | |
125 | if (status & 4) /* Selected */ | |
126 | ret |= PARPORT_STATUS_SELECT; | |
127 | /* the rest is not connected or handled autonomously in hardware */ | |
128 | ||
129 | return ret; | |
130 | } | |
131 | ||
132 | static unsigned char amiga_read_status(struct parport *p) | |
133 | { | |
134 | unsigned char status; | |
135 | ||
136 | status = status_amiga_to_pc(ciab.pra & 7); | |
137 | DPRINTK(KERN_DEBUG "read_status %02x\n", status); | |
138 | return status; | |
139 | } | |
140 | ||
1da177e4 LT |
141 | static void amiga_enable_irq(struct parport *p) |
142 | { | |
143 | enable_irq(IRQ_AMIGA_CIAA_FLG); | |
144 | } | |
145 | ||
146 | static void amiga_disable_irq(struct parport *p) | |
147 | { | |
148 | disable_irq(IRQ_AMIGA_CIAA_FLG); | |
149 | } | |
150 | ||
151 | static void amiga_data_forward(struct parport *p) | |
152 | { | |
153 | DPRINTK(KERN_DEBUG "forward\n"); | |
154 | ciaa.ddrb = 0xff; /* all pins output */ | |
155 | mb(); | |
156 | } | |
157 | ||
158 | static void amiga_data_reverse(struct parport *p) | |
159 | { | |
160 | DPRINTK(KERN_DEBUG "reverse\n"); | |
161 | ciaa.ddrb = 0; /* all pins input */ | |
162 | mb(); | |
163 | } | |
164 | ||
165 | static void amiga_init_state(struct pardevice *dev, struct parport_state *s) | |
166 | { | |
167 | s->u.amiga.data = 0; | |
168 | s->u.amiga.datadir = 255; | |
169 | s->u.amiga.status = 0; | |
170 | s->u.amiga.statusdir = 0; | |
171 | } | |
172 | ||
173 | static void amiga_save_state(struct parport *p, struct parport_state *s) | |
174 | { | |
175 | mb(); | |
176 | s->u.amiga.data = ciaa.prb; | |
177 | s->u.amiga.datadir = ciaa.ddrb; | |
178 | s->u.amiga.status = ciab.pra & 7; | |
179 | s->u.amiga.statusdir = ciab.ddra & 7; | |
180 | mb(); | |
181 | } | |
182 | ||
183 | static void amiga_restore_state(struct parport *p, struct parport_state *s) | |
184 | { | |
185 | mb(); | |
186 | ciaa.prb = s->u.amiga.data; | |
187 | ciaa.ddrb = s->u.amiga.datadir; | |
188 | ciab.pra |= (ciab.pra & 0xf8) | s->u.amiga.status; | |
189 | ciab.ddra |= (ciab.ddra & 0xf8) | s->u.amiga.statusdir; | |
190 | mb(); | |
191 | } | |
192 | ||
193 | static struct parport_operations pp_amiga_ops = { | |
194 | .write_data = amiga_write_data, | |
195 | .read_data = amiga_read_data, | |
196 | ||
197 | .write_control = amiga_write_control, | |
198 | .read_control = amiga_read_control, | |
199 | .frob_control = amiga_frob_control, | |
200 | ||
201 | .read_status = amiga_read_status, | |
202 | ||
203 | .enable_irq = amiga_enable_irq, | |
204 | .disable_irq = amiga_disable_irq, | |
205 | ||
206 | .data_forward = amiga_data_forward, | |
207 | .data_reverse = amiga_data_reverse, | |
208 | ||
209 | .init_state = amiga_init_state, | |
210 | .save_state = amiga_save_state, | |
211 | .restore_state = amiga_restore_state, | |
212 | ||
213 | .epp_write_data = parport_ieee1284_epp_write_data, | |
214 | .epp_read_data = parport_ieee1284_epp_read_data, | |
215 | .epp_write_addr = parport_ieee1284_epp_write_addr, | |
216 | .epp_read_addr = parport_ieee1284_epp_read_addr, | |
217 | ||
218 | .ecp_write_data = parport_ieee1284_ecp_write_data, | |
219 | .ecp_read_data = parport_ieee1284_ecp_read_data, | |
220 | .ecp_write_addr = parport_ieee1284_ecp_write_addr, | |
221 | ||
222 | .compat_write_data = parport_ieee1284_write_compat, | |
223 | .nibble_read_data = parport_ieee1284_read_nibble, | |
224 | .byte_read_data = parport_ieee1284_read_byte, | |
225 | ||
226 | .owner = THIS_MODULE, | |
227 | }; | |
228 | ||
229 | /* ----------- Initialisation code --------------------------------- */ | |
230 | ||
6f8221c2 | 231 | static int __init amiga_parallel_probe(struct platform_device *pdev) |
1da177e4 LT |
232 | { |
233 | struct parport *p; | |
234 | int err; | |
235 | ||
1da177e4 LT |
236 | ciaa.ddrb = 0xff; |
237 | ciab.ddra &= 0xf8; | |
238 | mb(); | |
239 | ||
240 | p = parport_register_port((unsigned long)&ciaa.prb, IRQ_AMIGA_CIAA_FLG, | |
241 | PARPORT_DMA_NONE, &pp_amiga_ops); | |
242 | if (!p) | |
6f8221c2 | 243 | return -EBUSY; |
1da177e4 | 244 | |
6f8221c2 GU |
245 | err = request_irq(IRQ_AMIGA_CIAA_FLG, parport_irq_handler, 0, p->name, |
246 | p); | |
1da177e4 LT |
247 | if (err) |
248 | goto out_irq; | |
249 | ||
1da177e4 LT |
250 | printk(KERN_INFO "%s: Amiga built-in port using irq\n", p->name); |
251 | /* XXX: set operating mode */ | |
252 | parport_announce_port(p); | |
253 | ||
6f8221c2 GU |
254 | platform_set_drvdata(pdev, p); |
255 | ||
1da177e4 LT |
256 | return 0; |
257 | ||
258 | out_irq: | |
259 | parport_put_port(p); | |
1da177e4 LT |
260 | return err; |
261 | } | |
262 | ||
6f8221c2 GU |
263 | static int __exit amiga_parallel_remove(struct platform_device *pdev) |
264 | { | |
265 | struct parport *port = platform_get_drvdata(pdev); | |
266 | ||
267 | parport_remove_port(port); | |
268 | if (port->irq != PARPORT_IRQ_NONE) | |
269 | free_irq(IRQ_AMIGA_CIAA_FLG, port); | |
270 | parport_put_port(port); | |
271 | platform_set_drvdata(pdev, NULL); | |
272 | return 0; | |
273 | } | |
274 | ||
275 | static struct platform_driver amiga_parallel_driver = { | |
276 | .remove = __exit_p(amiga_parallel_remove), | |
277 | .driver = { | |
278 | .name = "amiga-parallel", | |
279 | .owner = THIS_MODULE, | |
280 | }, | |
281 | }; | |
282 | ||
283 | static int __init amiga_parallel_init(void) | |
284 | { | |
285 | return platform_driver_probe(&amiga_parallel_driver, | |
286 | amiga_parallel_probe); | |
287 | } | |
288 | ||
289 | module_init(amiga_parallel_init); | |
290 | ||
291 | static void __exit amiga_parallel_exit(void) | |
1da177e4 | 292 | { |
6f8221c2 | 293 | platform_driver_unregister(&amiga_parallel_driver); |
1da177e4 LT |
294 | } |
295 | ||
6f8221c2 | 296 | module_exit(amiga_parallel_exit); |
1da177e4 LT |
297 | |
298 | MODULE_AUTHOR("Joerg Dorchain <joerg@dorchain.net>"); | |
299 | MODULE_DESCRIPTION("Parport Driver for Amiga builtin Port"); | |
300 | MODULE_SUPPORTED_DEVICE("Amiga builtin Parallel Port"); | |
301 | MODULE_LICENSE("GPL"); | |
6f8221c2 | 302 | MODULE_ALIAS("platform:amiga-parallel"); |