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