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 
21 static struct parport *this_port;
22 
23 static unsigned char
24 parport_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 
36 static void
37 parport_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 
47 static unsigned char
48 parport_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 
61 static void
62 parport_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 
75 static unsigned char
76 parport_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 
84 static unsigned char
85 parport_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 
91 static void
92 parport_atari_init_state(struct pardevice *d, struct parport_state *s)
93 {
94 }
95 
96 static void
97 parport_atari_save_state(struct parport *p, struct parport_state *s)
98 {
99 }
100 
101 static void
102 parport_atari_restore_state(struct parport *p, struct parport_state *s)
103 {
104 }
105 
106 static void
107 parport_atari_enable_irq(struct parport *p)
108 {
109 	enable_irq(IRQ_MFP_BUSY);
110 }
111 
112 static void
113 parport_atari_disable_irq(struct parport *p)
114 {
115 	disable_irq(IRQ_MFP_BUSY);
116 }
117 
118 static void
119 parport_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 
130 static void
131 parport_atari_data_reverse(struct parport *p)
132 {
133 }
134 
135 static 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 
172 static 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 
210 static 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 
218 MODULE_AUTHOR("Andreas Schwab");
219 MODULE_DESCRIPTION("Parport Driver for Atari builtin Port");
220 MODULE_SUPPORTED_DEVICE("Atari builtin Parallel Port");
221 MODULE_LICENSE("GPL");
222 
223 module_init(parport_atari_init)
224 module_exit(parport_atari_exit)
225