1// SPDX-License-Identifier: GPL-2.0-only
  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>
 22#include <linux/platform_device.h>
 23
 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
 32static void amiga_write_data(struct parport *p, unsigned char data)
 33{
 34	pr_debug("write_data %c\n", data);
 35	/* Triggers also /STROBE. This behavior cannot be changed */
 36	ciaa.prb = data;
 37	mb();
 38}
 39
 40static unsigned char amiga_read_data(struct parport *p)
 41{
 42	/* Triggers also /STROBE. This behavior cannot be changed */
 43	return ciaa.prb;
 44}
 45
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 46static 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
 54static void amiga_write_control(struct parport *p, unsigned char control)
 55{
 56	pr_debug("write_control %02x\n", control);
 57	/* No implementation possible */
 58}
 59	
 60static unsigned char amiga_read_control( struct parport *p)
 61{
 62	pr_debug("read_control\n");
 63	return control_amiga_to_pc(0);
 64}
 65
 66static unsigned char amiga_frob_control( struct parport *p, unsigned char mask, unsigned char val)
 67{
 68	unsigned char old;
 69
 70	pr_debug("frob_control mask %02x, value %02x\n", mask, val);
 71	old = amiga_read_control(p);
 72	amiga_write_control(p, (old & ~mask) ^ val);
 73	return old;
 74}
 75
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 76static 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
 91static unsigned char amiga_read_status(struct parport *p)
 92{
 93	unsigned char status;
 94
 95	status = status_amiga_to_pc(ciab.pra & 7);
 96	pr_debug("read_status %02x\n", status);
 97	return status;
 98}
 99
100static void amiga_enable_irq(struct parport *p)
101{
102	enable_irq(IRQ_AMIGA_CIAA_FLG);
103}
104
105static void amiga_disable_irq(struct parport *p)
106{
107	disable_irq(IRQ_AMIGA_CIAA_FLG);
108}
109
110static void amiga_data_forward(struct parport *p)
111{
112	pr_debug("forward\n");
113	ciaa.ddrb = 0xff; /* all pins output */
114	mb();
115}
116
117static void amiga_data_reverse(struct parport *p)
118{
119	pr_debug("reverse\n");
120	ciaa.ddrb = 0; /* all pins input */
121	mb();
122}
123
124static 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
132static 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
142static 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
152static 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
190static int __init amiga_parallel_probe(struct platform_device *pdev)
191{
192	struct parport *p;
193	int err;
194
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)
202		return -EBUSY;
203
204	err = request_irq(IRQ_AMIGA_CIAA_FLG, parport_irq_handler, 0, p->name,
205			  p);
206	if (err)
207		goto out_irq;
208
209	pr_info("%s: Amiga built-in port using irq\n", p->name);
210	/* XXX: set operating mode */
211	parport_announce_port(p);
212
213	platform_set_drvdata(pdev, p);
214
215	return 0;
216
217out_irq:
218	parport_put_port(p);
219	return err;
220}
221
222static 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);
 
230	return 0;
231}
232
233static struct platform_driver amiga_parallel_driver = {
234	.remove = __exit_p(amiga_parallel_remove),
235	.driver   = {
236		.name	= "amiga-parallel",
 
237	},
238};
239
240module_platform_driver_probe(amiga_parallel_driver, amiga_parallel_probe);
 
 
 
 
 
 
 
 
 
 
 
 
 
241
242MODULE_AUTHOR("Joerg Dorchain <joerg@dorchain.net>");
243MODULE_DESCRIPTION("Parport Driver for Amiga builtin Port");
 
244MODULE_LICENSE("GPL");
245MODULE_ALIAS("platform:amiga-parallel");

 
  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
 51#if 0
 52static 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
 68static 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
 76static 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	
 82static 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
 88static 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 */
 99static 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
117static 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
132static 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
141static void amiga_enable_irq(struct parport *p)
142{
143	enable_irq(IRQ_AMIGA_CIAA_FLG);
144}
145
146static void amiga_disable_irq(struct parport *p)
147{
148	disable_irq(IRQ_AMIGA_CIAA_FLG);
149}
150
151static 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
158static 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
165static 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
173static 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
183static 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
193static 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
231static int __init amiga_parallel_probe(struct platform_device *pdev)
232{
233	struct parport *p;
234	int err;
235
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)
243		return -EBUSY;
244
245	err = request_irq(IRQ_AMIGA_CIAA_FLG, parport_irq_handler, 0, p->name,
246			  p);
247	if (err)
248		goto out_irq;
249
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
254	platform_set_drvdata(pdev, p);
255
256	return 0;
257
258out_irq:
259	parport_put_port(p);
260	return err;
261}
262
263static 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
275static 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
283static int __init amiga_parallel_init(void)
284{
285	return platform_driver_probe(&amiga_parallel_driver,
286				     amiga_parallel_probe);
287}
288
289module_init(amiga_parallel_init);
290
291static void __exit amiga_parallel_exit(void)
292{
293	platform_driver_unregister(&amiga_parallel_driver);
294}
295
296module_exit(amiga_parallel_exit);
297
298MODULE_AUTHOR("Joerg Dorchain <joerg@dorchain.net>");
299MODULE_DESCRIPTION("Parport Driver for Amiga builtin Port");
300MODULE_SUPPORTED_DEVICE("Amiga builtin Parallel Port");
301MODULE_LICENSE("GPL");
302MODULE_ALIAS("platform:amiga-parallel");