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[karo-tx-linux.git] / drivers / parport / parport_atari.c
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 = NULL;
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)