Commit | Line | Data |
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09c434b8 | 1 | // SPDX-License-Identifier: GPL-2.0-only |
1da177e4 LT |
2 | /* Low-level parallel port routines for the Amiga built-in port |
3 | * | |
4 | * Author: Joerg Dorchain <joerg@dorchain.net> | |
5 | * | |
6 | * This is a complete rewrite of the code, but based heaviy upon the old | |
7 | * lp_intern. code. | |
8 | * | |
9 | * The built-in Amiga parallel port provides one port at a fixed address | |
10 | * with 8 bidirectional data lines (D0 - D7) and 3 bidirectional status | |
11 | * lines (BUSY, POUT, SEL), 1 output control line /STROBE (raised automatically | |
12 | * in hardware when the data register is accessed), and 1 input control line | |
13 | * /ACK, able to cause an interrupt, but both not directly settable by | |
14 | * software. | |
15 | */ | |
16 | ||
17 | #include <linux/module.h> | |
18 | #include <linux/init.h> | |
19 | #include <linux/parport.h> | |
20 | #include <linux/ioport.h> | |
21 | #include <linux/interrupt.h> | |
6f8221c2 GU |
22 | #include <linux/platform_device.h> |
23 | ||
1da177e4 LT |
24 | #include <asm/setup.h> |
25 | #include <asm/amigahw.h> | |
26 | #include <asm/irq.h> | |
27 | #include <asm/io.h> | |
28 | #include <asm/amigaints.h> | |
29 | ||
30 | #undef DEBUG | |
31 | #ifdef DEBUG | |
32 | #define DPRINTK printk | |
33 | #else | |
34 | #define DPRINTK(x...) do { } while (0) | |
35 | #endif | |
36 | ||
1da177e4 LT |
37 | |
38 | static void amiga_write_data(struct parport *p, unsigned char data) | |
39 | { | |
40 | DPRINTK(KERN_DEBUG "write_data %c\n",data); | |
41 | /* Triggers also /STROBE. This behavior cannot be changed */ | |
42 | ciaa.prb = data; | |
43 | mb(); | |
44 | } | |
45 | ||
46 | static unsigned char amiga_read_data(struct parport *p) | |
47 | { | |
48 | /* Triggers also /STROBE. This behavior cannot be changed */ | |
49 | return ciaa.prb; | |
50 | } | |
51 | ||
1da177e4 LT |
52 | static unsigned char control_amiga_to_pc(unsigned char control) |
53 | { | |
54 | return PARPORT_CONTROL_SELECT | | |
55 | PARPORT_CONTROL_AUTOFD | PARPORT_CONTROL_STROBE; | |
56 | /* fake value: interrupt enable, select in, no reset, | |
57 | no autolf, no strobe - seems to be closest the wiring diagram */ | |
58 | } | |
59 | ||
60 | static void amiga_write_control(struct parport *p, unsigned char control) | |
61 | { | |
62 | DPRINTK(KERN_DEBUG "write_control %02x\n",control); | |
63 | /* No implementation possible */ | |
64 | } | |
65 | ||
66 | static unsigned char amiga_read_control( struct parport *p) | |
67 | { | |
68 | DPRINTK(KERN_DEBUG "read_control \n"); | |
69 | return control_amiga_to_pc(0); | |
70 | } | |
71 | ||
72 | static unsigned char amiga_frob_control( struct parport *p, unsigned char mask, unsigned char val) | |
73 | { | |
74 | unsigned char old; | |
75 | ||
76 | DPRINTK(KERN_DEBUG "frob_control mask %02x, value %02x\n",mask,val); | |
77 | old = amiga_read_control(p); | |
78 | amiga_write_control(p, (old & ~mask) ^ val); | |
79 | return old; | |
80 | } | |
81 | ||
1da177e4 LT |
82 | static unsigned char status_amiga_to_pc(unsigned char status) |
83 | { | |
84 | unsigned char ret = PARPORT_STATUS_BUSY | PARPORT_STATUS_ACK | PARPORT_STATUS_ERROR; | |
85 | ||
86 | if (status & 1) /* Busy */ | |
87 | ret &= ~PARPORT_STATUS_BUSY; | |
88 | if (status & 2) /* PaperOut */ | |
89 | ret |= PARPORT_STATUS_PAPEROUT; | |
90 | if (status & 4) /* Selected */ | |
91 | ret |= PARPORT_STATUS_SELECT; | |
92 | /* the rest is not connected or handled autonomously in hardware */ | |
93 | ||
94 | return ret; | |
95 | } | |
96 | ||
97 | static unsigned char amiga_read_status(struct parport *p) | |
98 | { | |
99 | unsigned char status; | |
100 | ||
101 | status = status_amiga_to_pc(ciab.pra & 7); | |
102 | DPRINTK(KERN_DEBUG "read_status %02x\n", status); | |
103 | return status; | |
104 | } | |
105 | ||
1da177e4 LT |
106 | static void amiga_enable_irq(struct parport *p) |
107 | { | |
108 | enable_irq(IRQ_AMIGA_CIAA_FLG); | |
109 | } | |
110 | ||
111 | static void amiga_disable_irq(struct parport *p) | |
112 | { | |
113 | disable_irq(IRQ_AMIGA_CIAA_FLG); | |
114 | } | |
115 | ||
116 | static void amiga_data_forward(struct parport *p) | |
117 | { | |
118 | DPRINTK(KERN_DEBUG "forward\n"); | |
119 | ciaa.ddrb = 0xff; /* all pins output */ | |
120 | mb(); | |
121 | } | |
122 | ||
123 | static void amiga_data_reverse(struct parport *p) | |
124 | { | |
125 | DPRINTK(KERN_DEBUG "reverse\n"); | |
126 | ciaa.ddrb = 0; /* all pins input */ | |
127 | mb(); | |
128 | } | |
129 | ||
130 | static void amiga_init_state(struct pardevice *dev, struct parport_state *s) | |
131 | { | |
132 | s->u.amiga.data = 0; | |
133 | s->u.amiga.datadir = 255; | |
134 | s->u.amiga.status = 0; | |
135 | s->u.amiga.statusdir = 0; | |
136 | } | |
137 | ||
138 | static void amiga_save_state(struct parport *p, struct parport_state *s) | |
139 | { | |
140 | mb(); | |
141 | s->u.amiga.data = ciaa.prb; | |
142 | s->u.amiga.datadir = ciaa.ddrb; | |
143 | s->u.amiga.status = ciab.pra & 7; | |
144 | s->u.amiga.statusdir = ciab.ddra & 7; | |
145 | mb(); | |
146 | } | |
147 | ||
148 | static void amiga_restore_state(struct parport *p, struct parport_state *s) | |
149 | { | |
150 | mb(); | |
151 | ciaa.prb = s->u.amiga.data; | |
152 | ciaa.ddrb = s->u.amiga.datadir; | |
153 | ciab.pra |= (ciab.pra & 0xf8) | s->u.amiga.status; | |
154 | ciab.ddra |= (ciab.ddra & 0xf8) | s->u.amiga.statusdir; | |
155 | mb(); | |
156 | } | |
157 | ||
158 | static struct parport_operations pp_amiga_ops = { | |
159 | .write_data = amiga_write_data, | |
160 | .read_data = amiga_read_data, | |
161 | ||
162 | .write_control = amiga_write_control, | |
163 | .read_control = amiga_read_control, | |
164 | .frob_control = amiga_frob_control, | |
165 | ||
166 | .read_status = amiga_read_status, | |
167 | ||
168 | .enable_irq = amiga_enable_irq, | |
169 | .disable_irq = amiga_disable_irq, | |
170 | ||
171 | .data_forward = amiga_data_forward, | |
172 | .data_reverse = amiga_data_reverse, | |
173 | ||
174 | .init_state = amiga_init_state, | |
175 | .save_state = amiga_save_state, | |
176 | .restore_state = amiga_restore_state, | |
177 | ||
178 | .epp_write_data = parport_ieee1284_epp_write_data, | |
179 | .epp_read_data = parport_ieee1284_epp_read_data, | |
180 | .epp_write_addr = parport_ieee1284_epp_write_addr, | |
181 | .epp_read_addr = parport_ieee1284_epp_read_addr, | |
182 | ||
183 | .ecp_write_data = parport_ieee1284_ecp_write_data, | |
184 | .ecp_read_data = parport_ieee1284_ecp_read_data, | |
185 | .ecp_write_addr = parport_ieee1284_ecp_write_addr, | |
186 | ||
187 | .compat_write_data = parport_ieee1284_write_compat, | |
188 | .nibble_read_data = parport_ieee1284_read_nibble, | |
189 | .byte_read_data = parport_ieee1284_read_byte, | |
190 | ||
191 | .owner = THIS_MODULE, | |
192 | }; | |
193 | ||
194 | /* ----------- Initialisation code --------------------------------- */ | |
195 | ||
6f8221c2 | 196 | static int __init amiga_parallel_probe(struct platform_device *pdev) |
1da177e4 LT |
197 | { |
198 | struct parport *p; | |
199 | int err; | |
200 | ||
1da177e4 LT |
201 | ciaa.ddrb = 0xff; |
202 | ciab.ddra &= 0xf8; | |
203 | mb(); | |
204 | ||
205 | p = parport_register_port((unsigned long)&ciaa.prb, IRQ_AMIGA_CIAA_FLG, | |
206 | PARPORT_DMA_NONE, &pp_amiga_ops); | |
207 | if (!p) | |
6f8221c2 | 208 | return -EBUSY; |
1da177e4 | 209 | |
6f8221c2 GU |
210 | err = request_irq(IRQ_AMIGA_CIAA_FLG, parport_irq_handler, 0, p->name, |
211 | p); | |
1da177e4 LT |
212 | if (err) |
213 | goto out_irq; | |
214 | ||
1da177e4 LT |
215 | printk(KERN_INFO "%s: Amiga built-in port using irq\n", p->name); |
216 | /* XXX: set operating mode */ | |
217 | parport_announce_port(p); | |
218 | ||
6f8221c2 GU |
219 | platform_set_drvdata(pdev, p); |
220 | ||
1da177e4 LT |
221 | return 0; |
222 | ||
223 | out_irq: | |
224 | parport_put_port(p); | |
1da177e4 LT |
225 | return err; |
226 | } | |
227 | ||
6f8221c2 GU |
228 | static int __exit amiga_parallel_remove(struct platform_device *pdev) |
229 | { | |
230 | struct parport *port = platform_get_drvdata(pdev); | |
231 | ||
232 | parport_remove_port(port); | |
233 | if (port->irq != PARPORT_IRQ_NONE) | |
234 | free_irq(IRQ_AMIGA_CIAA_FLG, port); | |
235 | parport_put_port(port); | |
6f8221c2 GU |
236 | return 0; |
237 | } | |
238 | ||
239 | static struct platform_driver amiga_parallel_driver = { | |
240 | .remove = __exit_p(amiga_parallel_remove), | |
241 | .driver = { | |
242 | .name = "amiga-parallel", | |
6f8221c2 GU |
243 | }, |
244 | }; | |
245 | ||
5bcdf0ce | 246 | module_platform_driver_probe(amiga_parallel_driver, amiga_parallel_probe); |
1da177e4 LT |
247 | |
248 | MODULE_AUTHOR("Joerg Dorchain <joerg@dorchain.net>"); | |
249 | MODULE_DESCRIPTION("Parport Driver for Amiga builtin Port"); | |
250 | MODULE_SUPPORTED_DEVICE("Amiga builtin Parallel Port"); | |
251 | MODULE_LICENSE("GPL"); | |
6f8221c2 | 252 | MODULE_ALIAS("platform:amiga-parallel"); |