1/* Low-level parallel port routines for the Atari builtin port
2 *
3 * Author: Andreas Schwab <schwab@issan.informatik.uni-dortmund.de>
4 *
5 * Based on parport_amiga.c.
6 *
7 * The built-in Atari parallel port provides one port at a fixed address
8 * with 8 output data lines (D0 - D7), 1 output control line (STROBE)
9 * and 1 input status line (BUSY) able to cause an interrupt.
10 */
11
12#include <linux/module.h>
13#include <linux/init.h>
14#include <linux/parport.h>
15#include <linux/interrupt.h>
16#include <asm/setup.h>
17#include <asm/atarihw.h>
18#include <asm/irq.h>
19#include <asm/atariints.h>
20
21static struct parport *this_port = NULL;
22
23static unsigned char
24parport_atari_read_data(struct parport *p)
25{
26	unsigned long flags;
27	unsigned char data;
28
29	local_irq_save(flags);
30	sound_ym.rd_data_reg_sel = 15;
31	data = sound_ym.rd_data_reg_sel;
32	local_irq_restore(flags);
33	return data;
34}
35
36static void
37parport_atari_write_data(struct parport *p, unsigned char data)
38{
39	unsigned long flags;
40
41	local_irq_save(flags);
42	sound_ym.rd_data_reg_sel = 15;
43	sound_ym.wd_data = data;
44	local_irq_restore(flags);
45}
46
47static unsigned char
48parport_atari_read_control(struct parport *p)
49{
50	unsigned long flags;
51	unsigned char control = 0;
52
53	local_irq_save(flags);
54	sound_ym.rd_data_reg_sel = 14;
55	if (!(sound_ym.rd_data_reg_sel & (1 << 5)))
56		control = PARPORT_CONTROL_STROBE;
57	local_irq_restore(flags);
58	return control;
59}
60
61static void
62parport_atari_write_control(struct parport *p, unsigned char control)
63{
64	unsigned long flags;
65
66	local_irq_save(flags);
67	sound_ym.rd_data_reg_sel = 14;
68	if (control & PARPORT_CONTROL_STROBE)
69		sound_ym.wd_data = sound_ym.rd_data_reg_sel & ~(1 << 5);
70	else
71		sound_ym.wd_data = sound_ym.rd_data_reg_sel | (1 << 5);
72	local_irq_restore(flags);
73}
74
75static unsigned char
76parport_atari_frob_control(struct parport *p, unsigned char mask,
77			   unsigned char val)
78{
79	unsigned char old = parport_atari_read_control(p);
80	parport_atari_write_control(p, (old & ~mask) ^ val);
81	return old;
82}
83
84static unsigned char
85parport_atari_read_status(struct parport *p)
86{
87	return ((st_mfp.par_dt_reg & 1 ? 0 : PARPORT_STATUS_BUSY) |
88		PARPORT_STATUS_SELECT | PARPORT_STATUS_ERROR);
89}
90
91static void
92parport_atari_init_state(struct pardevice *d, struct parport_state *s)
93{
94}
95
96static void
97parport_atari_save_state(struct parport *p, struct parport_state *s)
98{
99}
100
101static void
102parport_atari_restore_state(struct parport *p, struct parport_state *s)
103{
104}
105
106static void
107parport_atari_enable_irq(struct parport *p)
108{
109	enable_irq(IRQ_MFP_BUSY);
110}
111
112static void
113parport_atari_disable_irq(struct parport *p)
114{
115	disable_irq(IRQ_MFP_BUSY);
116}
117
118static void
119parport_atari_data_forward(struct parport *p)
120{
121	unsigned long flags;
122
123	local_irq_save(flags);
124	/* Soundchip port B as output. */
125	sound_ym.rd_data_reg_sel = 7;
126	sound_ym.wd_data = sound_ym.rd_data_reg_sel | 0x40;
127	local_irq_restore(flags);
128}
129
130static void
131parport_atari_data_reverse(struct parport *p)
132{
133}
134
135static struct parport_operations parport_atari_ops = {
136	.write_data	= parport_atari_write_data,
137	.read_data	= parport_atari_read_data,
138
139	.write_control	= parport_atari_write_control,
140	.read_control	= parport_atari_read_control,
141	.frob_control	= parport_atari_frob_control,
142
143	.read_status	= parport_atari_read_status,
144
145	.enable_irq	= parport_atari_enable_irq,
146	.disable_irq	= parport_atari_disable_irq,
147
148	.data_forward	= parport_atari_data_forward,
149	.data_reverse	= parport_atari_data_reverse,
150
151	.init_state	= parport_atari_init_state,
152	.save_state	= parport_atari_save_state,
153	.restore_state	= parport_atari_restore_state,
154
155	.epp_write_data	= parport_ieee1284_epp_write_data,
156	.epp_read_data	= parport_ieee1284_epp_read_data,
157	.epp_write_addr	= parport_ieee1284_epp_write_addr,
158	.epp_read_addr	= parport_ieee1284_epp_read_addr,
159
160	.ecp_write_data	= parport_ieee1284_ecp_write_data,
161	.ecp_read_data	= parport_ieee1284_ecp_read_data,
162	.ecp_write_addr	= parport_ieee1284_ecp_write_addr,
163
164	.compat_write_data	= parport_ieee1284_write_compat,
165	.nibble_read_data	= parport_ieee1284_read_nibble,
166	.byte_read_data		= parport_ieee1284_read_byte,
167
168	.owner		= THIS_MODULE,
169};
170
171
172static int __init parport_atari_init(void)
173{
174	struct parport *p;
175	unsigned long flags;
176
177	if (MACH_IS_ATARI) {
178		local_irq_save(flags);
179		/* Soundchip port A/B as output. */
180		sound_ym.rd_data_reg_sel = 7;
181		sound_ym.wd_data = (sound_ym.rd_data_reg_sel & 0x3f) | 0xc0;
182		/* STROBE high. */
183		sound_ym.rd_data_reg_sel = 14;
184		sound_ym.wd_data = sound_ym.rd_data_reg_sel | (1 << 5);
185		local_irq_restore(flags);
186		/* MFP port I0 as input. */
187		st_mfp.data_dir &= ~1;
188		/* MFP port I0 interrupt on high->low edge. */
189		st_mfp.active_edge &= ~1;
190		p = parport_register_port((unsigned long)&sound_ym.wd_data,
191					  IRQ_MFP_BUSY, PARPORT_DMA_NONE,
192					  &parport_atari_ops);
193		if (!p)
194			return -ENODEV;
195		if (request_irq(IRQ_MFP_BUSY, parport_irq_handler, 0, p->name,
196				p)) {
197			parport_put_port (p);
198			return -ENODEV;
199		}
200
201		this_port = p;
202		printk(KERN_INFO "%s: Atari built-in port using irq\n", p->name);
203		parport_announce_port (p);
204
205		return 0;
206	}
207	return -ENODEV;
208}
209
210static void __exit parport_atari_exit(void)
211{
212	parport_remove_port(this_port);
213	if (this_port->irq != PARPORT_IRQ_NONE)
214		free_irq(IRQ_MFP_BUSY, this_port);
215	parport_put_port(this_port);
216}
217
218MODULE_AUTHOR("Andreas Schwab");
219MODULE_DESCRIPTION("Parport Driver for Atari builtin Port");
220MODULE_SUPPORTED_DEVICE("Atari builtin Parallel Port");
221MODULE_LICENSE("GPL");
222
223module_init(parport_atari_init)
224module_exit(parport_atari_exit)
225