arch/m68k/include/asm/sun3xflop.h

   1 /* SPDX-License-Identifier: GPL-2.0 */
   2 /* sun3xflop.h: Sun3/80 specific parts of the floppy driver.
   3  *
   4  * Derived partially from asm-sparc/floppy.h, which is:
   5  *     Copyright (C) 1995 David S. Miller (davem@caip.rutgers.edu)
   6  *
   7  * Sun3x version 2/4/2000 Sam Creasey (sammy@sammy.net)
   8  */
   9
  10 #ifndef __ASM_SUN3X_FLOPPY_H
  11 #define __ASM_SUN3X_FLOPPY_H
  12
  13 #include <linux/pgtable.h>
  14 #include <asm/page.h>
  15 #include <asm/irq.h>
  16 #include <asm/sun3x.h>
  17
  18 /* default interrupt vector */
  19 #define SUN3X_FDC_IRQ 0x40
  20
  21 /* some constants */
  22 #define FCR_TC 0x1
  23 #define FCR_EJECT 0x2
  24 #define FCR_MTRON 0x4
  25 #define FCR_DSEL1 0x8
  26 #define FCR_DSEL0 0x10
  27
  28 /* We don't need no stinkin' I/O port allocation crap. */
  29 #undef release_region
  30 #undef request_region
  31 #define release_region(X, Y)    do { } while(0)
  32 #define request_region(X, Y, Z) (1)
  33
  34 struct sun3xflop_private {
  35         volatile unsigned char *status_r;
  36         volatile unsigned char *data_r;
  37         volatile unsigned char *fcr_r;
  38         volatile unsigned char *fvr_r;
  39         unsigned char fcr;
  40 } sun3x_fdc;
  41
  42 /* Super paranoid... */
  43 #undef HAVE_DISABLE_HLT
  44
  45 /* Routines unique to each controller type on a Sun. */
  46 static unsigned char sun3x_82072_fd_inb(int port)
  47 {
  48         static int once = 0;
  49 //      udelay(5);
  50         switch(port & 7) {
  51         default:
  52                 pr_crit("floppy: Asked to read unknown port %d\n", port);
  53                 panic("floppy: Port bolixed.");
  54         case 4: /* FD_STATUS */
  55                 return (*sun3x_fdc.status_r) & ~STATUS_DMA;
  56         case 5: /* FD_DATA */
  57                 return (*sun3x_fdc.data_r);
  58         case 7: /* FD_DIR */
  59                 /* ugly hack, I can't find a way to actually detect the disk */
  60                 if(!once) {
  61                         once = 1;
  62                         return 0x80;
  63                 }
  64                 return 0;
  65         };
  66         panic("sun_82072_fd_inb: How did I get here?");
  67 }
  68
  69 static void sun3x_82072_fd_outb(unsigned char value, int port)
  70 {
  71 //      udelay(5);
  72         switch(port & 7) {
  73         default:
  74                 pr_crit("floppy: Asked to write to unknown port %d\n", port);
  75                 panic("floppy: Port bolixed.");
  76         case 2: /* FD_DOR */
  77                 /* Oh geese, 82072 on the Sun has no DOR register,
  78                  * so we make do with taunting the FCR.
  79                  *
  80                  * ASSUMPTIONS:  There will only ever be one floppy
  81                  *               drive attached to a Sun controller
  82                  *               and it will be at drive zero.
  83                  */
  84
  85         {
  86                 unsigned char fcr = sun3x_fdc.fcr;
  87
  88                 if(value & 0x10) {
  89                         fcr |= (FCR_DSEL0 | FCR_MTRON);
  90                 } else
  91                         fcr &= ~(FCR_DSEL0 | FCR_MTRON);
  92
  93
  94                 if(fcr != sun3x_fdc.fcr) {
  95                         *(sun3x_fdc.fcr_r) = fcr;
  96                         sun3x_fdc.fcr = fcr;
  97                 }
  98         }
  99                 break;
 100         case 5: /* FD_DATA */
 101                 *(sun3x_fdc.data_r) = value;
 102                 break;
 103         case 7: /* FD_DCR */
 104                 *(sun3x_fdc.status_r) = value;
 105                 break;
 106         case 4: /* FD_STATUS */
 107                 *(sun3x_fdc.status_r) = value;
 108                 break;
 109         };
 110         return;
 111 }
 112
 113
 114 asmlinkage irqreturn_t sun3xflop_hardint(int irq, void *dev_id)
 115 {
 116         register unsigned char st;
 117
 118 #undef TRACE_FLPY_INT
 119 #define NO_FLOPPY_ASSEMBLER
 120
 121 #ifdef TRACE_FLPY_INT
 122         static int calls=0;
 123         static int bytes=0;
 124         static int dma_wait=0;
 125 #endif
 126         if(!doing_pdma) {
 127                 floppy_interrupt(irq, dev_id);
 128                 return IRQ_HANDLED;
 129         }
 130
 131 //      pr_info("doing pdma\n");// st %x\n", sun_fdc->status_82072);
 132
 133 #ifdef TRACE_FLPY_INT
 134         if(!calls)
 135                 bytes = virtual_dma_count;
 136 #endif
 137
 138         {
 139                 register int lcount;
 140                 register char *lptr;
 141
 142                 for(lcount=virtual_dma_count, lptr=virtual_dma_addr;
 143                     lcount; lcount--, lptr++) {
 144 /*                      st=fd_inb(virtual_dma_port+4) & 0x80 ;  */
 145                         st = *(sun3x_fdc.status_r);
 146 /*                      if(st != 0xa0)                  */
 147 /*                              break;                  */
 148
 149                         if((st & 0x80) == 0) {
 150                                 virtual_dma_count = lcount;
 151                                 virtual_dma_addr = lptr;
 152                                 return IRQ_HANDLED;
 153                         }
 154
 155                         if((st & 0x20) == 0)
 156                                 break;
 157
 158                         if(virtual_dma_mode)
 159 /*                              fd_outb(*lptr, virtual_dma_port+5); */
 160                                 *(sun3x_fdc.data_r) = *lptr;
 161                         else
 162 /*                              *lptr = fd_inb(virtual_dma_port+5); */
 163                                 *lptr = *(sun3x_fdc.data_r);
 164                 }
 165
 166                 virtual_dma_count = lcount;
 167                 virtual_dma_addr = lptr;
 168 /*              st = fd_inb(virtual_dma_port+4);   */
 169                 st = *(sun3x_fdc.status_r);
 170         }
 171
 172 #ifdef TRACE_FLPY_INT
 173         calls++;
 174 #endif
 175 //      pr_info("st=%02x\n", st);
 176         if(st == 0x20)
 177                 return IRQ_HANDLED;
 178         if(!(st & 0x20)) {
 179                 virtual_dma_residue += virtual_dma_count;
 180                 virtual_dma_count=0;
 181                 doing_pdma = 0;
 182
 183 #ifdef TRACE_FLPY_INT
 184                 pr_info("count=%x, residue=%x calls=%d bytes=%x dma_wait=%d\n",
 185                         virtual_dma_count, virtual_dma_residue, calls, bytes,
 186                         dma_wait);
 187                 calls = 0;
 188                 dma_wait=0;
 189 #endif
 190
 191                 floppy_interrupt(irq, dev_id);
 192                 return IRQ_HANDLED;
 193         }
 194
 195
 196 #ifdef TRACE_FLPY_INT
 197         if(!virtual_dma_count)
 198                 dma_wait++;
 199 #endif
 200         return IRQ_HANDLED;
 201 }
 202
 203 static int sun3xflop_request_irq(void)
 204 {
 205         static int once = 0;
 206         int error;
 207
 208         if(!once) {
 209                 once = 1;
 210                 error = request_irq(FLOPPY_IRQ, sun3xflop_hardint,
 211                                     0, "floppy", NULL);
 212                 return ((error == 0) ? 0 : -1);
 213         } else return 0;
 214 }
 215
 216 static void __init floppy_set_flags(int *ints,int param, int param2);
 217
 218 static int sun3xflop_init(void)
 219 {
 220         if(FLOPPY_IRQ < 0x40)
 221                 FLOPPY_IRQ = SUN3X_FDC_IRQ;
 222
 223         sun3x_fdc.status_r = (volatile unsigned char *)SUN3X_FDC;
 224         sun3x_fdc.data_r  = (volatile unsigned char *)(SUN3X_FDC+1);
 225         sun3x_fdc.fcr_r = (volatile unsigned char *)SUN3X_FDC_FCR;
 226         sun3x_fdc.fvr_r = (volatile unsigned char *)SUN3X_FDC_FVR;
 227         sun3x_fdc.fcr = 0;
 228
 229         /* Last minute sanity check... */
 230         if(*sun3x_fdc.status_r == 0xff) {
 231                 return -1;
 232         }
 233
 234         *sun3x_fdc.fvr_r = FLOPPY_IRQ;
 235
 236         *sun3x_fdc.fcr_r = FCR_TC;
 237         udelay(10);
 238         *sun3x_fdc.fcr_r = 0;
 239
 240         /* Success... */
 241         floppy_set_flags(NULL, 1, FD_BROKEN_DCL); // I don't know how to detect this.
 242         allowed_drive_mask = 0x01;
 243         return (int) SUN3X_FDC;
 244 }
 245
 246 /* I'm not precisely sure this eject routine works */
 247 static int sun3x_eject(void)
 248 {
 249         if(MACH_IS_SUN3X) {
 250
 251                 sun3x_fdc.fcr |= (FCR_DSEL0 | FCR_EJECT);
 252                 *(sun3x_fdc.fcr_r) = sun3x_fdc.fcr;
 253                 udelay(10);
 254                 sun3x_fdc.fcr &= ~(FCR_DSEL0 | FCR_EJECT);
 255                 *(sun3x_fdc.fcr_r) = sun3x_fdc.fcr;
 256         }
 257
 258         return 0;
 259 }
 260
 261 #define fd_eject(drive) sun3x_eject()
 262
 263 #endif /* !(__ASM_SUN3X_FLOPPY_H) */