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 | |
1da177e4 LT |
31 | |
32 | static void amiga_write_data(struct parport *p, unsigned char data) | |
33 | { | |
45a272bc | 34 | pr_debug("write_data %c\n", data); |
1da177e4 LT |
35 | /* Triggers also /STROBE. This behavior cannot be changed */ |
36 | ciaa.prb = data; | |
37 | mb(); | |
38 | } | |
39 | ||
40 | static unsigned char amiga_read_data(struct parport *p) | |
41 | { | |
42 | /* Triggers also /STROBE. This behavior cannot be changed */ | |
43 | return ciaa.prb; | |
44 | } | |
45 | ||
1da177e4 LT |
46 | static unsigned char control_amiga_to_pc(unsigned char control) |
47 | { | |
48 | return PARPORT_CONTROL_SELECT | | |
49 | PARPORT_CONTROL_AUTOFD | PARPORT_CONTROL_STROBE; | |
50 | /* fake value: interrupt enable, select in, no reset, | |
51 | no autolf, no strobe - seems to be closest the wiring diagram */ | |
52 | } | |
53 | ||
54 | static void amiga_write_control(struct parport *p, unsigned char control) | |
55 | { | |
45a272bc | 56 | pr_debug("write_control %02x\n", control); |
1da177e4 LT |
57 | /* No implementation possible */ |
58 | } | |
59 | ||
60 | static unsigned char amiga_read_control( struct parport *p) | |
61 | { | |
45a272bc | 62 | pr_debug("read_control\n"); |
1da177e4 LT |
63 | return control_amiga_to_pc(0); |
64 | } | |
65 | ||
66 | static unsigned char amiga_frob_control( struct parport *p, unsigned char mask, unsigned char val) | |
67 | { | |
68 | unsigned char old; | |
69 | ||
45a272bc | 70 | pr_debug("frob_control mask %02x, value %02x\n", mask, val); |
1da177e4 LT |
71 | old = amiga_read_control(p); |
72 | amiga_write_control(p, (old & ~mask) ^ val); | |
73 | return old; | |
74 | } | |
75 | ||
1da177e4 LT |
76 | static unsigned char status_amiga_to_pc(unsigned char status) |
77 | { | |
78 | unsigned char ret = PARPORT_STATUS_BUSY | PARPORT_STATUS_ACK | PARPORT_STATUS_ERROR; | |
79 | ||
80 | if (status & 1) /* Busy */ | |
81 | ret &= ~PARPORT_STATUS_BUSY; | |
82 | if (status & 2) /* PaperOut */ | |
83 | ret |= PARPORT_STATUS_PAPEROUT; | |
84 | if (status & 4) /* Selected */ | |
85 | ret |= PARPORT_STATUS_SELECT; | |
86 | /* the rest is not connected or handled autonomously in hardware */ | |
87 | ||
88 | return ret; | |
89 | } | |
90 | ||
91 | static unsigned char amiga_read_status(struct parport *p) | |
92 | { | |
93 | unsigned char status; | |
94 | ||
95 | status = status_amiga_to_pc(ciab.pra & 7); | |
45a272bc | 96 | pr_debug("read_status %02x\n", status); |
1da177e4 LT |
97 | return status; |
98 | } | |
99 | ||
1da177e4 LT |
100 | static void amiga_enable_irq(struct parport *p) |
101 | { | |
102 | enable_irq(IRQ_AMIGA_CIAA_FLG); | |
103 | } | |
104 | ||
105 | static void amiga_disable_irq(struct parport *p) | |
106 | { | |
107 | disable_irq(IRQ_AMIGA_CIAA_FLG); | |
108 | } | |
109 | ||
110 | static void amiga_data_forward(struct parport *p) | |
111 | { | |
45a272bc | 112 | pr_debug("forward\n"); |
1da177e4 LT |
113 | ciaa.ddrb = 0xff; /* all pins output */ |
114 | mb(); | |
115 | } | |
116 | ||
117 | static void amiga_data_reverse(struct parport *p) | |
118 | { | |
45a272bc | 119 | pr_debug("reverse\n"); |
1da177e4 LT |
120 | ciaa.ddrb = 0; /* all pins input */ |
121 | mb(); | |
122 | } | |
123 | ||
124 | static void amiga_init_state(struct pardevice *dev, struct parport_state *s) | |
125 | { | |
126 | s->u.amiga.data = 0; | |
127 | s->u.amiga.datadir = 255; | |
128 | s->u.amiga.status = 0; | |
129 | s->u.amiga.statusdir = 0; | |
130 | } | |
131 | ||
132 | static void amiga_save_state(struct parport *p, struct parport_state *s) | |
133 | { | |
134 | mb(); | |
135 | s->u.amiga.data = ciaa.prb; | |
136 | s->u.amiga.datadir = ciaa.ddrb; | |
137 | s->u.amiga.status = ciab.pra & 7; | |
138 | s->u.amiga.statusdir = ciab.ddra & 7; | |
139 | mb(); | |
140 | } | |
141 | ||
142 | static void amiga_restore_state(struct parport *p, struct parport_state *s) | |
143 | { | |
144 | mb(); | |
145 | ciaa.prb = s->u.amiga.data; | |
146 | ciaa.ddrb = s->u.amiga.datadir; | |
147 | ciab.pra |= (ciab.pra & 0xf8) | s->u.amiga.status; | |
148 | ciab.ddra |= (ciab.ddra & 0xf8) | s->u.amiga.statusdir; | |
149 | mb(); | |
150 | } | |
151 | ||
152 | static struct parport_operations pp_amiga_ops = { | |
153 | .write_data = amiga_write_data, | |
154 | .read_data = amiga_read_data, | |
155 | ||
156 | .write_control = amiga_write_control, | |
157 | .read_control = amiga_read_control, | |
158 | .frob_control = amiga_frob_control, | |
159 | ||
160 | .read_status = amiga_read_status, | |
161 | ||
162 | .enable_irq = amiga_enable_irq, | |
163 | .disable_irq = amiga_disable_irq, | |
164 | ||
165 | .data_forward = amiga_data_forward, | |
166 | .data_reverse = amiga_data_reverse, | |
167 | ||
168 | .init_state = amiga_init_state, | |
169 | .save_state = amiga_save_state, | |
170 | .restore_state = amiga_restore_state, | |
171 | ||
172 | .epp_write_data = parport_ieee1284_epp_write_data, | |
173 | .epp_read_data = parport_ieee1284_epp_read_data, | |
174 | .epp_write_addr = parport_ieee1284_epp_write_addr, | |
175 | .epp_read_addr = parport_ieee1284_epp_read_addr, | |
176 | ||
177 | .ecp_write_data = parport_ieee1284_ecp_write_data, | |
178 | .ecp_read_data = parport_ieee1284_ecp_read_data, | |
179 | .ecp_write_addr = parport_ieee1284_ecp_write_addr, | |
180 | ||
181 | .compat_write_data = parport_ieee1284_write_compat, | |
182 | .nibble_read_data = parport_ieee1284_read_nibble, | |
183 | .byte_read_data = parport_ieee1284_read_byte, | |
184 | ||
185 | .owner = THIS_MODULE, | |
186 | }; | |
187 | ||
188 | /* ----------- Initialisation code --------------------------------- */ | |
189 | ||
6f8221c2 | 190 | static int __init amiga_parallel_probe(struct platform_device *pdev) |
1da177e4 LT |
191 | { |
192 | struct parport *p; | |
193 | int err; | |
194 | ||
1da177e4 LT |
195 | ciaa.ddrb = 0xff; |
196 | ciab.ddra &= 0xf8; | |
197 | mb(); | |
198 | ||
199 | p = parport_register_port((unsigned long)&ciaa.prb, IRQ_AMIGA_CIAA_FLG, | |
200 | PARPORT_DMA_NONE, &pp_amiga_ops); | |
201 | if (!p) | |
6f8221c2 | 202 | return -EBUSY; |
1da177e4 | 203 | |
6f8221c2 GU |
204 | err = request_irq(IRQ_AMIGA_CIAA_FLG, parport_irq_handler, 0, p->name, |
205 | p); | |
1da177e4 LT |
206 | if (err) |
207 | goto out_irq; | |
208 | ||
decf26f6 | 209 | pr_info("%s: Amiga built-in port using irq\n", p->name); |
1da177e4 LT |
210 | /* XXX: set operating mode */ |
211 | parport_announce_port(p); | |
212 | ||
6f8221c2 GU |
213 | platform_set_drvdata(pdev, p); |
214 | ||
1da177e4 LT |
215 | return 0; |
216 | ||
217 | out_irq: | |
218 | parport_put_port(p); | |
1da177e4 LT |
219 | return err; |
220 | } | |
221 | ||
6f8221c2 GU |
222 | static int __exit amiga_parallel_remove(struct platform_device *pdev) |
223 | { | |
224 | struct parport *port = platform_get_drvdata(pdev); | |
225 | ||
226 | parport_remove_port(port); | |
227 | if (port->irq != PARPORT_IRQ_NONE) | |
228 | free_irq(IRQ_AMIGA_CIAA_FLG, port); | |
229 | parport_put_port(port); | |
6f8221c2 GU |
230 | return 0; |
231 | } | |
232 | ||
233 | static struct platform_driver amiga_parallel_driver = { | |
234 | .remove = __exit_p(amiga_parallel_remove), | |
235 | .driver = { | |
236 | .name = "amiga-parallel", | |
6f8221c2 GU |
237 | }, |
238 | }; | |
239 | ||
5bcdf0ce | 240 | module_platform_driver_probe(amiga_parallel_driver, amiga_parallel_probe); |
1da177e4 LT |
241 | |
242 | MODULE_AUTHOR("Joerg Dorchain <joerg@dorchain.net>"); | |
243 | MODULE_DESCRIPTION("Parport Driver for Amiga builtin Port"); | |
1da177e4 | 244 | MODULE_LICENSE("GPL"); |
6f8221c2 | 245 | MODULE_ALIAS("platform:amiga-parallel"); |