include/asm-m68k/floppy.h

   1 /*
   2  * Q40 Architecture specific parts of the Floppy driver
   3  *
   4  * This file is subject to the terms and conditions of the GNU General Public
   5  * License.  See the file "COPYING" in the main directory of this archive
   6  * for more details.
   7  *
   8  * Copyright (C) 1999
   9  */
  10
  11 #include <asm/io.h>
  12
  13 #include <linux/vmalloc.h>
  14
  15
  16 asmlinkage void floppy_hardint(int irq, void *dev_id, struct pt_regs * regs);
  17
  18 #define MAX_DMA_ADDRESS   0x00  /* nothing like that */
  19
  20 extern spinlock_t  dma_spin_lock;
  21
  22 static __inline__ unsigned long claim_dma_lock(void)
  23 {
  24         unsigned long flags;
  25         spin_lock_irqsave(&dma_spin_lock, flags);
  26         return flags;
  27 }
  28
  29 static __inline__ void release_dma_lock(unsigned long flags)
  30 {
  31         spin_unlock_irqrestore(&dma_spin_lock, flags);
  32 }
  33
  34
  35
  36 #define fd_inb(port)                    inb_p(port)
  37 #define fd_outb(port,value)             outb_p(port,value)
  38
  39
  40 #define fd_request_dma()        vdma_request_dma(FLOPPY_DMA,"floppy")
  41 /*#define fd_free_dma()           */
  42
  43
  44 #define fd_get_dma_residue()    vdma_get_dma_residue(FLOPPY_DMA)
  45 #define fd_dma_mem_alloc(size)  vdma_mem_alloc(size)
  46 #define fd_dma_setup(addr, size, mode, io) vdma_dma_setup(addr, size, mode, io)
  47
  48
  49 #define fd_enable_irq()           /* nothing... */
  50 #define fd_disable_irq()          /* nothing... */
  51 #define fd_free_irq()           free_irq(FLOPPY_IRQ, NULL)
  52
  53 #define fd_free_dma()             /* nothing */
  54
  55 /* No 64k boundary crossing problems on Q40 - no DMA at all */
  56 #define CROSS_64KB(a,s) (0)
  57
  58 #define DMA_MODE_READ  0x44    /* i386 look-alike */
  59 #define DMA_MODE_WRITE 0x48
  60
  61
  62 static int q40_floppy_init(void)
  63 {
  64   use_virtual_dma =1;
  65   /* FLOPPY_IRQ=6; */
  66
  67   if (MACH_IS_Q40)
  68     return 0x3f0;
  69   else
  70     return -1;
  71 }
  72
  73
  74
  75
  76 /*
  77  * Again, the CMOS information doesn't work on the Q40..
  78  */
  79 #define FLOPPY0_TYPE 6
  80 #define FLOPPY1_TYPE 0
  81
  82
  83
  84
  85 #define FLOPPY_MOTOR_MASK 0xf0
  86
  87
  88
  89
  90 /* basically PC init + set use_virtual_dma */
  91 #define  FDC1 q40_floppy_init()
  92 static int FDC2 = -1;
  93
  94
  95 #define N_FDC 1
  96 #define N_DRIVE 8
  97
  98
  99
 100 /* vdma stuff adapted from asm-i386/floppy.h */
 101
 102 static int virtual_dma_count=0;
 103 static int virtual_dma_residue=0;
 104 static char *virtual_dma_addr=0;
 105 static int virtual_dma_mode=0;
 106 static int doing_pdma=0;
 107
 108
 109
 110 static int fd_request_irq(void)
 111 {
 112   return request_irq(FLOPPY_IRQ, floppy_hardint,SA_INTERRUPT,
 113                                                    "floppy", NULL);
 114 }
 115
 116 /*#define SLOW_DOWN do{outb(0,0x80);}while(0)*/
 117 #define SLOW_DOWN do{int count=1;do{if(!jiffies)break;}while(count-->0);}while(0)
 118
 119 asmlinkage void floppy_hardint(int irq, void *dev_id, struct pt_regs * regs)
 120 {
 121         register unsigned char st;
 122
 123 #undef TRACE_FLPY_INT
 124 #define NO_FLOPPY_ASSEMBLER
 125
 126 #ifdef TRACE_FLPY_INT
 127         static int calls=0;
 128         static int bytes=0;
 129         static int dma_wait=0;
 130 #endif
 131         if(!doing_pdma) {
 132                 floppy_interrupt(irq, dev_id, regs);
 133                 return;
 134         }
 135
 136 #ifdef TRACE_FLPY_INT
 137         if(!calls)
 138                 bytes = virtual_dma_count;
 139 #endif
 140
 141         {
 142                 register int lcount;
 143                 register char *lptr;
 144
 145                 /* serve 1st byte fast: */
 146
 147                 st=1;
 148                 for(lcount=virtual_dma_count, lptr=virtual_dma_addr;
 149                     lcount; lcount--, lptr++) {
 150                         st=inb(virtual_dma_port+4) & 0xa0 ;
 151                         if(st != 0xa0)
 152                                 break;
 153                         if(virtual_dma_mode)
 154                                 outb_p(*lptr, virtual_dma_port+5);
 155                         else
 156                                 *lptr = inb_p(virtual_dma_port+5);
 157                 }
 158
 159                 virtual_dma_count = lcount;
 160                 virtual_dma_addr = lptr;
 161                 st = inb(virtual_dma_port+4);
 162         }
 163
 164 #ifdef TRACE_FLPY_INT
 165         calls++;
 166 #endif
 167         if(st == 0x20)
 168                 return;
 169         if(!(st & 0x20)) {
 170                 virtual_dma_residue += virtual_dma_count;
 171                 virtual_dma_count=0;
 172 #ifdef TRACE_FLPY_INT
 173                 printk("count=%x, residue=%x calls=%d bytes=%d dma_wait=%d\n",
 174                        virtual_dma_count, virtual_dma_residue, calls, bytes,
 175                        dma_wait);
 176                 calls = 0;
 177                 dma_wait=0;
 178 #endif
 179                 doing_pdma = 0;
 180                 floppy_interrupt(irq, dev_id, regs);
 181                 return;
 182         }
 183 #ifdef TRACE_FLPY_INT
 184         if(!virtual_dma_count)
 185                 dma_wait++;
 186 #endif
 187 }
 188
 189
 190
 191 static int vdma_request_dma(unsigned int dmanr, const char * device_id)
 192 {
 193         return 0;
 194 }
 195
 196
 197 static int vdma_get_dma_residue(unsigned int dummy)
 198 {
 199         return virtual_dma_count + virtual_dma_residue;
 200 }
 201
 202
 203 static unsigned long vdma_mem_alloc(unsigned long size)
 204 {
 205         return (unsigned long) vmalloc(size);
 206
 207 }
 208
 209 static void _fd_dma_mem_free(unsigned long addr, unsigned long size)
 210 {
 211         vfree((void *)addr);
 212 }
 213 #define fd_dma_mem_free(addr,size) _fd_dma_mem_free(addr, size)
 214
 215
 216 /* choose_dma_mode ???*/
 217
 218 static int vdma_dma_setup(char *addr, unsigned long size, int mode, int io)
 219 {
 220         doing_pdma = 1;
 221         virtual_dma_port = io;
 222         virtual_dma_mode = (mode  == DMA_MODE_WRITE);
 223         virtual_dma_addr = addr;
 224         virtual_dma_count = size;
 225         virtual_dma_residue = 0;
 226         return 0;
 227 }
 228
 229
 230
 231 static void fd_disable_dma(void)
 232 {
 233         doing_pdma = 0;
 234         virtual_dma_residue += virtual_dma_count;
 235         virtual_dma_count=0;
 236 }
 237
 238
 239