Commit | Line | Data |
---|---|---|
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> | |
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 | /* as this ports irq handling is already done, we use a generic funktion */ | |
141 | static irqreturn_t amiga_interrupt(int irq, void *dev_id, struct pt_regs *regs) | |
142 | { | |
143 | parport_generic_irq(irq, (struct parport *) dev_id, regs); | |
144 | return IRQ_HANDLED; | |
145 | } | |
146 | ||
147 | static void amiga_enable_irq(struct parport *p) | |
148 | { | |
149 | enable_irq(IRQ_AMIGA_CIAA_FLG); | |
150 | } | |
151 | ||
152 | static void amiga_disable_irq(struct parport *p) | |
153 | { | |
154 | disable_irq(IRQ_AMIGA_CIAA_FLG); | |
155 | } | |
156 | ||
157 | static 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 | ||
164 | static 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 | ||
171 | static 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 | ||
179 | static 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 | ||
189 | static 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 | ||
199 | static 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 | ||
237 | static 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 | ||
269 | out_irq: | |
270 | parport_put_port(p); | |
271 | out_port: | |
272 | release_mem_region(CIAA_PHYSADDR-1+0x100, 0x100); | |
273 | out_mem: | |
274 | return err; | |
275 | } | |
276 | ||
277 | static 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 | ||
287 | MODULE_AUTHOR("Joerg Dorchain <joerg@dorchain.net>"); | |
288 | MODULE_DESCRIPTION("Parport Driver for Amiga builtin Port"); | |
289 | MODULE_SUPPORTED_DEVICE("Amiga builtin Parallel Port"); | |
290 | MODULE_LICENSE("GPL"); | |
291 | ||
292 | module_init(parport_amiga_init) | |
293 | module_exit(parport_amiga_exit) |