1 /* Low-level parallel port routines for the Atari builtin port
3 * Author: Andreas Schwab <schwab@issan.informatik.uni-dortmund.de>
5 * Based on parport_amiga.c.
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.
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>
19 #include <asm/atariints.h>
21 static struct parport *this_port = NULL;
24 parport_atari_read_data(struct parport *p)
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);
37 parport_atari_write_data(struct parport *p, unsigned char data)
41 local_irq_save(flags);
42 sound_ym.rd_data_reg_sel = 15;
43 sound_ym.wd_data = data;
44 local_irq_restore(flags);
48 parport_atari_read_control(struct parport *p)
51 unsigned char control = 0;
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);
62 parport_atari_write_control(struct parport *p, unsigned char control)
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);
71 sound_ym.wd_data = sound_ym.rd_data_reg_sel | (1 << 5);
72 local_irq_restore(flags);
76 parport_atari_frob_control(struct parport *p, unsigned char mask,
79 unsigned char old = parport_atari_read_control(p);
80 parport_atari_write_control(p, (old & ~mask) ^ val);
85 parport_atari_read_status(struct parport *p)
87 return ((st_mfp.par_dt_reg & 1 ? 0 : PARPORT_STATUS_BUSY) |
88 PARPORT_STATUS_SELECT | PARPORT_STATUS_ERROR);
92 parport_atari_init_state(struct pardevice *d, struct parport_state *s)
97 parport_atari_save_state(struct parport *p, struct parport_state *s)
102 parport_atari_restore_state(struct parport *p, struct parport_state *s)
107 parport_atari_enable_irq(struct parport *p)
109 enable_irq(IRQ_MFP_BUSY);
113 parport_atari_disable_irq(struct parport *p)
115 disable_irq(IRQ_MFP_BUSY);
119 parport_atari_data_forward(struct parport *p)
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);
131 parport_atari_data_reverse(struct parport *p)
135 static struct parport_operations parport_atari_ops = {
136 .write_data = parport_atari_write_data,
137 .read_data = parport_atari_read_data,
139 .write_control = parport_atari_write_control,
140 .read_control = parport_atari_read_control,
141 .frob_control = parport_atari_frob_control,
143 .read_status = parport_atari_read_status,
145 .enable_irq = parport_atari_enable_irq,
146 .disable_irq = parport_atari_disable_irq,
148 .data_forward = parport_atari_data_forward,
149 .data_reverse = parport_atari_data_reverse,
151 .init_state = parport_atari_init_state,
152 .save_state = parport_atari_save_state,
153 .restore_state = parport_atari_restore_state,
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,
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,
164 .compat_write_data = parport_ieee1284_write_compat,
165 .nibble_read_data = parport_ieee1284_read_nibble,
166 .byte_read_data = parport_ieee1284_read_byte,
168 .owner = THIS_MODULE,
172 static int __init parport_atari_init(void)
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;
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,
195 if (request_irq(IRQ_MFP_BUSY, parport_irq_handler,
196 IRQ_TYPE_SLOW, p->name, p)) {
197 parport_put_port (p);
202 printk(KERN_INFO "%s: Atari built-in port using irq\n", p->name);
203 parport_announce_port (p);
210 static void __exit parport_atari_exit(void)
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);
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");
223 module_init(parport_atari_init)
224 module_exit(parport_atari_exit)