Merge remote-tracking branch 'spi/for-5.12' into spi-linus
[platform/kernel/linux-rpi.git] / drivers / parport / parport_atari.c
1 // SPDX-License-Identifier: GPL-2.0-only
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
22 static struct parport *this_port;
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 {
88         return ((st_mfp.par_dt_reg & 1 ? 0 : PARPORT_STATUS_BUSY) |
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
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 {
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. */
188                 st_mfp.data_dir &= ~1;
189                 /* MFP port I0 interrupt on high->low edge. */
190                 st_mfp.active_edge &= ~1;
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;
196                 if (request_irq(IRQ_MFP_BUSY, parport_irq_handler, 0, p->name,
197                                 p)) {
198                         parport_put_port (p);
199                         return -ENODEV;
200                 }
201
202                 this_port = p;
203                 pr_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_LICENSE("GPL");
222
223 module_init(parport_atari_init)
224 module_exit(parport_atari_exit)