1 // SPDX-License-Identifier: GPL-2.0-only
2 /* Low-level parallel port routines for the Atari builtin port
4 * Author: Andreas Schwab <schwab@issan.informatik.uni-dortmund.de>
6 * Based on parport_amiga.c.
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.
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>
20 #include <asm/atariints.h>
22 static struct parport *this_port;
25 parport_atari_read_data(struct parport *p)
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);
38 parport_atari_write_data(struct parport *p, unsigned char data)
42 local_irq_save(flags);
43 sound_ym.rd_data_reg_sel = 15;
44 sound_ym.wd_data = data;
45 local_irq_restore(flags);
49 parport_atari_read_control(struct parport *p)
52 unsigned char control = 0;
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);
63 parport_atari_write_control(struct parport *p, unsigned char control)
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);
72 sound_ym.wd_data = sound_ym.rd_data_reg_sel | (1 << 5);
73 local_irq_restore(flags);
77 parport_atari_frob_control(struct parport *p, unsigned char mask,
80 unsigned char old = parport_atari_read_control(p);
81 parport_atari_write_control(p, (old & ~mask) ^ val);
86 parport_atari_read_status(struct parport *p)
88 return ((st_mfp.par_dt_reg & 1 ? 0 : PARPORT_STATUS_BUSY) |
89 PARPORT_STATUS_SELECT | PARPORT_STATUS_ERROR);
93 parport_atari_init_state(struct pardevice *d, struct parport_state *s)
98 parport_atari_save_state(struct parport *p, struct parport_state *s)
103 parport_atari_restore_state(struct parport *p, struct parport_state *s)
108 parport_atari_enable_irq(struct parport *p)
110 enable_irq(IRQ_MFP_BUSY);
114 parport_atari_disable_irq(struct parport *p)
116 disable_irq(IRQ_MFP_BUSY);
120 parport_atari_data_forward(struct parport *p)
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);
132 parport_atari_data_reverse(struct parport *p)
136 static struct parport_operations parport_atari_ops = {
137 .write_data = parport_atari_write_data,
138 .read_data = parport_atari_read_data,
140 .write_control = parport_atari_write_control,
141 .read_control = parport_atari_read_control,
142 .frob_control = parport_atari_frob_control,
144 .read_status = parport_atari_read_status,
146 .enable_irq = parport_atari_enable_irq,
147 .disable_irq = parport_atari_disable_irq,
149 .data_forward = parport_atari_data_forward,
150 .data_reverse = parport_atari_data_reverse,
152 .init_state = parport_atari_init_state,
153 .save_state = parport_atari_save_state,
154 .restore_state = parport_atari_restore_state,
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,
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,
165 .compat_write_data = parport_ieee1284_write_compat,
166 .nibble_read_data = parport_ieee1284_read_nibble,
167 .byte_read_data = parport_ieee1284_read_byte,
169 .owner = THIS_MODULE,
173 static int __init parport_atari_init(void)
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;
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,
196 if (request_irq(IRQ_MFP_BUSY, parport_irq_handler, 0, p->name,
198 parport_put_port (p);
203 pr_info("%s: Atari built-in port using irq\n", p->name);
204 parport_announce_port (p);
211 static void __exit parport_atari_exit(void)
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);
219 MODULE_AUTHOR("Andreas Schwab");
220 MODULE_DESCRIPTION("Parport Driver for Atari builtin Port");
221 MODULE_LICENSE("GPL");
223 module_init(parport_atari_init)
224 module_exit(parport_atari_exit)