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
 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	return 0;
236}
237
238static struct platform_driver amiga_parallel_driver = {
239	.remove = __exit_p(amiga_parallel_remove),
240	.driver   = {
241		.name	= "amiga-parallel",
242	},
243};
244
245module_platform_driver_probe(amiga_parallel_driver, amiga_parallel_probe);
246
247MODULE_AUTHOR("Joerg Dorchain <joerg@dorchain.net>");
248MODULE_DESCRIPTION("Parport Driver for Amiga builtin Port");
249MODULE_SUPPORTED_DEVICE("Amiga builtin Parallel Port");
250MODULE_LICENSE("GPL");
251MODULE_ALIAS("platform:amiga-parallel");