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09c434b8 | 1 | // SPDX-License-Identifier: GPL-2.0-only |
1da177e4 LT |
2 | /* Low-level parallel port routines for the Atari builtin port |
3 | * | |
4 | * Author: Andreas Schwab <schwab@issan.informatik.uni-dortmund.de> | |
5 | * | |
6 | * Based on parport_amiga.c. | |
7 | * | |
8 | * The built-in Atari parallel port provides one port at a fixed address | |
9 | * with 8 output data lines (D0 - D7), 1 output control line (STROBE) | |
10 | * and 1 input status line (BUSY) able to cause an interrupt. | |
11 | */ | |
12 | ||
13 | #include <linux/module.h> | |
14 | #include <linux/init.h> | |
15 | #include <linux/parport.h> | |
16 | #include <linux/interrupt.h> | |
17 | #include <asm/setup.h> | |
18 | #include <asm/atarihw.h> | |
19 | #include <asm/irq.h> | |
20 | #include <asm/atariints.h> | |
21 | ||
df4c756e | 22 | static struct parport *this_port; |
1da177e4 LT |
23 | |
24 | static unsigned char | |
25 | parport_atari_read_data(struct parport *p) | |
26 | { | |
27 | unsigned long flags; | |
28 | unsigned char data; | |
29 | ||
30 | local_irq_save(flags); | |
31 | sound_ym.rd_data_reg_sel = 15; | |
32 | data = sound_ym.rd_data_reg_sel; | |
33 | local_irq_restore(flags); | |
34 | return data; | |
35 | } | |
36 | ||
37 | static void | |
38 | parport_atari_write_data(struct parport *p, unsigned char data) | |
39 | { | |
40 | unsigned long flags; | |
41 | ||
42 | local_irq_save(flags); | |
43 | sound_ym.rd_data_reg_sel = 15; | |
44 | sound_ym.wd_data = data; | |
45 | local_irq_restore(flags); | |
46 | } | |
47 | ||
48 | static unsigned char | |
49 | parport_atari_read_control(struct parport *p) | |
50 | { | |
51 | unsigned long flags; | |
52 | unsigned char control = 0; | |
53 | ||
54 | local_irq_save(flags); | |
55 | sound_ym.rd_data_reg_sel = 14; | |
56 | if (!(sound_ym.rd_data_reg_sel & (1 << 5))) | |
57 | control = PARPORT_CONTROL_STROBE; | |
58 | local_irq_restore(flags); | |
59 | return control; | |
60 | } | |
61 | ||
62 | static void | |
63 | parport_atari_write_control(struct parport *p, unsigned char control) | |
64 | { | |
65 | unsigned long flags; | |
66 | ||
67 | local_irq_save(flags); | |
68 | sound_ym.rd_data_reg_sel = 14; | |
69 | if (control & PARPORT_CONTROL_STROBE) | |
70 | sound_ym.wd_data = sound_ym.rd_data_reg_sel & ~(1 << 5); | |
71 | else | |
72 | sound_ym.wd_data = sound_ym.rd_data_reg_sel | (1 << 5); | |
73 | local_irq_restore(flags); | |
74 | } | |
75 | ||
76 | static unsigned char | |
77 | parport_atari_frob_control(struct parport *p, unsigned char mask, | |
78 | unsigned char val) | |
79 | { | |
80 | unsigned char old = parport_atari_read_control(p); | |
81 | parport_atari_write_control(p, (old & ~mask) ^ val); | |
82 | return old; | |
83 | } | |
84 | ||
85 | static unsigned char | |
86 | parport_atari_read_status(struct parport *p) | |
87 | { | |
3d92e8f3 | 88 | return ((st_mfp.par_dt_reg & 1 ? 0 : PARPORT_STATUS_BUSY) | |
1da177e4 LT |
89 | PARPORT_STATUS_SELECT | PARPORT_STATUS_ERROR); |
90 | } | |
91 | ||
92 | static void | |
93 | parport_atari_init_state(struct pardevice *d, struct parport_state *s) | |
94 | { | |
95 | } | |
96 | ||
97 | static void | |
98 | parport_atari_save_state(struct parport *p, struct parport_state *s) | |
99 | { | |
100 | } | |
101 | ||
102 | static void | |
103 | parport_atari_restore_state(struct parport *p, struct parport_state *s) | |
104 | { | |
105 | } | |
106 | ||
1da177e4 LT |
107 | static void |
108 | parport_atari_enable_irq(struct parport *p) | |
109 | { | |
110 | enable_irq(IRQ_MFP_BUSY); | |
111 | } | |
112 | ||
113 | static void | |
114 | parport_atari_disable_irq(struct parport *p) | |
115 | { | |
116 | disable_irq(IRQ_MFP_BUSY); | |
117 | } | |
118 | ||
119 | static void | |
120 | parport_atari_data_forward(struct parport *p) | |
121 | { | |
122 | unsigned long flags; | |
123 | ||
124 | local_irq_save(flags); | |
125 | /* Soundchip port B as output. */ | |
126 | sound_ym.rd_data_reg_sel = 7; | |
127 | sound_ym.wd_data = sound_ym.rd_data_reg_sel | 0x40; | |
128 | local_irq_restore(flags); | |
129 | } | |
130 | ||
131 | static void | |
132 | parport_atari_data_reverse(struct parport *p) | |
133 | { | |
1da177e4 LT |
134 | } |
135 | ||
136 | static struct parport_operations parport_atari_ops = { | |
137 | .write_data = parport_atari_write_data, | |
138 | .read_data = parport_atari_read_data, | |
139 | ||
140 | .write_control = parport_atari_write_control, | |
141 | .read_control = parport_atari_read_control, | |
142 | .frob_control = parport_atari_frob_control, | |
143 | ||
144 | .read_status = parport_atari_read_status, | |
145 | ||
146 | .enable_irq = parport_atari_enable_irq, | |
147 | .disable_irq = parport_atari_disable_irq, | |
148 | ||
149 | .data_forward = parport_atari_data_forward, | |
150 | .data_reverse = parport_atari_data_reverse, | |
151 | ||
152 | .init_state = parport_atari_init_state, | |
153 | .save_state = parport_atari_save_state, | |
154 | .restore_state = parport_atari_restore_state, | |
155 | ||
156 | .epp_write_data = parport_ieee1284_epp_write_data, | |
157 | .epp_read_data = parport_ieee1284_epp_read_data, | |
158 | .epp_write_addr = parport_ieee1284_epp_write_addr, | |
159 | .epp_read_addr = parport_ieee1284_epp_read_addr, | |
160 | ||
161 | .ecp_write_data = parport_ieee1284_ecp_write_data, | |
162 | .ecp_read_data = parport_ieee1284_ecp_read_data, | |
163 | .ecp_write_addr = parport_ieee1284_ecp_write_addr, | |
164 | ||
165 | .compat_write_data = parport_ieee1284_write_compat, | |
166 | .nibble_read_data = parport_ieee1284_read_nibble, | |
167 | .byte_read_data = parport_ieee1284_read_byte, | |
168 | ||
169 | .owner = THIS_MODULE, | |
170 | }; | |
171 | ||
172 | ||
173 | static int __init parport_atari_init(void) | |
174 | { | |
175 | struct parport *p; | |
176 | unsigned long flags; | |
177 | ||
178 | if (MACH_IS_ATARI) { | |
179 | local_irq_save(flags); | |
180 | /* Soundchip port A/B as output. */ | |
181 | sound_ym.rd_data_reg_sel = 7; | |
182 | sound_ym.wd_data = (sound_ym.rd_data_reg_sel & 0x3f) | 0xc0; | |
183 | /* STROBE high. */ | |
184 | sound_ym.rd_data_reg_sel = 14; | |
185 | sound_ym.wd_data = sound_ym.rd_data_reg_sel | (1 << 5); | |
186 | local_irq_restore(flags); | |
187 | /* MFP port I0 as input. */ | |
3d92e8f3 | 188 | st_mfp.data_dir &= ~1; |
1da177e4 | 189 | /* MFP port I0 interrupt on high->low edge. */ |
3d92e8f3 | 190 | st_mfp.active_edge &= ~1; |
1da177e4 LT |
191 | p = parport_register_port((unsigned long)&sound_ym.wd_data, |
192 | IRQ_MFP_BUSY, PARPORT_DMA_NONE, | |
193 | &parport_atari_ops); | |
194 | if (!p) | |
195 | return -ENODEV; | |
0afafbf3 GU |
196 | if (request_irq(IRQ_MFP_BUSY, parport_irq_handler, 0, p->name, |
197 | p)) { | |
1da177e4 LT |
198 | parport_put_port (p); |
199 | return -ENODEV; | |
200 | } | |
201 | ||
202 | this_port = p; | |
203 | printk(KERN_INFO "%s: Atari built-in port using irq\n", p->name); | |
204 | parport_announce_port (p); | |
205 | ||
206 | return 0; | |
207 | } | |
208 | return -ENODEV; | |
209 | } | |
210 | ||
211 | static void __exit parport_atari_exit(void) | |
212 | { | |
213 | parport_remove_port(this_port); | |
214 | if (this_port->irq != PARPORT_IRQ_NONE) | |
215 | free_irq(IRQ_MFP_BUSY, this_port); | |
216 | parport_put_port(this_port); | |
217 | } | |
218 | ||
219 | MODULE_AUTHOR("Andreas Schwab"); | |
220 | MODULE_DESCRIPTION("Parport Driver for Atari builtin Port"); | |
221 | MODULE_SUPPORTED_DEVICE("Atari builtin Parallel Port"); | |
222 | MODULE_LICENSE("GPL"); | |
223 | ||
224 | module_init(parport_atari_init) | |
225 | module_exit(parport_atari_exit) |