blob: 78c3f34108bc1b8c618b9364ac8584e0acf8598c [file] [log] [blame]
Linus Torvalds1da177e2005-04-16 15:20:36 -07001/* 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 ((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 irqreturn_t
107parport_atari_interrupt(int irq, void *dev_id, struct pt_regs *regs)
108{
109 parport_generic_irq(irq, (struct parport *) dev_id, regs);
110 return IRQ_HANDLED;
111}
112
113static void
114parport_atari_enable_irq(struct parport *p)
115{
116 enable_irq(IRQ_MFP_BUSY);
117}
118
119static void
120parport_atari_disable_irq(struct parport *p)
121{
122 disable_irq(IRQ_MFP_BUSY);
123}
124
125static void
126parport_atari_data_forward(struct parport *p)
127{
128 unsigned long flags;
129
130 local_irq_save(flags);
131 /* Soundchip port B as output. */
132 sound_ym.rd_data_reg_sel = 7;
133 sound_ym.wd_data = sound_ym.rd_data_reg_sel | 0x40;
134 local_irq_restore(flags);
135}
136
137static void
138parport_atari_data_reverse(struct parport *p)
139{
140#if 0 /* too dangerous, can kill sound chip */
141 unsigned long flags;
142
143 local_irq_save(flags);
144 /* Soundchip port B as input. */
145 sound_ym.rd_data_reg_sel = 7;
146 sound_ym.wd_data = sound_ym.rd_data_reg_sel & ~0x40;
147 local_irq_restore(flags);
148#endif
149}
150
151static struct parport_operations parport_atari_ops = {
152 .write_data = parport_atari_write_data,
153 .read_data = parport_atari_read_data,
154
155 .write_control = parport_atari_write_control,
156 .read_control = parport_atari_read_control,
157 .frob_control = parport_atari_frob_control,
158
159 .read_status = parport_atari_read_status,
160
161 .enable_irq = parport_atari_enable_irq,
162 .disable_irq = parport_atari_disable_irq,
163
164 .data_forward = parport_atari_data_forward,
165 .data_reverse = parport_atari_data_reverse,
166
167 .init_state = parport_atari_init_state,
168 .save_state = parport_atari_save_state,
169 .restore_state = parport_atari_restore_state,
170
171 .epp_write_data = parport_ieee1284_epp_write_data,
172 .epp_read_data = parport_ieee1284_epp_read_data,
173 .epp_write_addr = parport_ieee1284_epp_write_addr,
174 .epp_read_addr = parport_ieee1284_epp_read_addr,
175
176 .ecp_write_data = parport_ieee1284_ecp_write_data,
177 .ecp_read_data = parport_ieee1284_ecp_read_data,
178 .ecp_write_addr = parport_ieee1284_ecp_write_addr,
179
180 .compat_write_data = parport_ieee1284_write_compat,
181 .nibble_read_data = parport_ieee1284_read_nibble,
182 .byte_read_data = parport_ieee1284_read_byte,
183
184 .owner = THIS_MODULE,
185};
186
187
188static int __init parport_atari_init(void)
189{
190 struct parport *p;
191 unsigned long flags;
192
193 if (MACH_IS_ATARI) {
194 local_irq_save(flags);
195 /* Soundchip port A/B as output. */
196 sound_ym.rd_data_reg_sel = 7;
197 sound_ym.wd_data = (sound_ym.rd_data_reg_sel & 0x3f) | 0xc0;
198 /* STROBE high. */
199 sound_ym.rd_data_reg_sel = 14;
200 sound_ym.wd_data = sound_ym.rd_data_reg_sel | (1 << 5);
201 local_irq_restore(flags);
202 /* MFP port I0 as input. */
203 mfp.data_dir &= ~1;
204 /* MFP port I0 interrupt on high->low edge. */
205 mfp.active_edge &= ~1;
206 p = parport_register_port((unsigned long)&sound_ym.wd_data,
207 IRQ_MFP_BUSY, PARPORT_DMA_NONE,
208 &parport_atari_ops);
209 if (!p)
210 return -ENODEV;
211 if (request_irq(IRQ_MFP_BUSY, parport_atari_interrupt,
212 IRQ_TYPE_SLOW, p->name, p)) {
213 parport_put_port (p);
214 return -ENODEV;
215 }
216
217 this_port = p;
218 printk(KERN_INFO "%s: Atari built-in port using irq\n", p->name);
219 parport_announce_port (p);
220
221 return 0;
222 }
223 return -ENODEV;
224}
225
226static void __exit parport_atari_exit(void)
227{
228 parport_remove_port(this_port);
229 if (this_port->irq != PARPORT_IRQ_NONE)
230 free_irq(IRQ_MFP_BUSY, this_port);
231 parport_put_port(this_port);
232}
233
234MODULE_AUTHOR("Andreas Schwab");
235MODULE_DESCRIPTION("Parport Driver for Atari builtin Port");
236MODULE_SUPPORTED_DEVICE("Atari builtin Parallel Port");
237MODULE_LICENSE("GPL");
238
239module_init(parport_atari_init)
240module_exit(parport_atari_exit)