Root/drivers/parport/parport_amiga.c

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

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