include/asm-m68k/floppy.h

   1 /*
   2  * Implementation independent bits of the Floppy driver.
   3  *
   4  * much of this file is derived from what was originally the Q40 floppy driver.
   5  *
   6  * This file is subject to the terms and conditions of the GNU General Public
   7  * License.  See the file "COPYING" in the main directory of this archive
   8  * for more details.
   9  *
  10  * Copyright (C) 1999, 2000, 2001
  11  *
  12  * Sun3x support added 2/4/2000 Sam Creasey (sammy@sammy.net)
  13  *
  14  */
  15
  16 #include <asm/io.h>
  17
  18 #include <linux/vmalloc.h>
  19
  20 asmlinkage irqreturn_t floppy_hardint(int irq, void *dev_id);
  21
  22 /* constants... */
  23
  24 #undef MAX_DMA_ADDRESS
  25 #define MAX_DMA_ADDRESS   0x00  /* nothing like that */
  26
  27
  28 /*
  29  * Again, the CMOS information doesn't work on m68k..
  30  */
  31 #define FLOPPY0_TYPE (MACH_IS_Q40 ? 6 : 4)
  32 #define FLOPPY1_TYPE 0
  33
  34 #define FLOPPY_MOTOR_MASK 0xf0
  35
  36
  37 /* basically PC init + set use_virtual_dma */
  38 #define  FDC1 m68k_floppy_init()
  39
  40 #define N_FDC 1
  41 #define N_DRIVE 8
  42
  43
  44 /* vdma globals adapted from asm-i386/floppy.h */
  45
  46 static int virtual_dma_count=0;
  47 static int virtual_dma_residue=0;
  48 static char *virtual_dma_addr=NULL;
  49 static int virtual_dma_mode=0;
  50 static int doing_pdma=0;
  51
  52 #include <asm/sun3xflop.h>
  53
  54 extern spinlock_t  dma_spin_lock;
  55
  56 static __inline__ unsigned long claim_dma_lock(void)
  57 {
  58         unsigned long flags;
  59         spin_lock_irqsave(&dma_spin_lock, flags);
  60         return flags;
  61 }
  62
  63 static __inline__ void release_dma_lock(unsigned long flags)
  64 {
  65         spin_unlock_irqrestore(&dma_spin_lock, flags);
  66 }
  67
  68
  69 static __inline__ unsigned char fd_inb(int port)
  70 {
  71         if(MACH_IS_Q40)
  72                 return inb_p(port);
  73         else if(MACH_IS_SUN3X)
  74                 return sun3x_82072_fd_inb(port);
  75         return 0;
  76 }
  77
  78 static __inline__ void fd_outb(unsigned char value, int port)
  79 {
  80         if(MACH_IS_Q40)
  81                 outb_p(value, port);
  82         else if(MACH_IS_SUN3X)
  83                 sun3x_82072_fd_outb(value, port);
  84 }
  85
  86
  87 static int fd_request_irq(void)
  88 {
  89         if(MACH_IS_Q40)
  90                 return request_irq(FLOPPY_IRQ, floppy_hardint,
  91                                    IRQF_DISABLED, "floppy", floppy_hardint);
  92         else if(MACH_IS_SUN3X)
  93                 return sun3xflop_request_irq();
  94         return -ENXIO;
  95 }
  96
  97 static void fd_free_irq(void)
  98 {
  99         if(MACH_IS_Q40)
 100                 free_irq(FLOPPY_IRQ, floppy_hardint);
 101 }
 102
 103 #define fd_request_dma()        vdma_request_dma(FLOPPY_DMA,"floppy")
 104 #define fd_get_dma_residue()    vdma_get_dma_residue(FLOPPY_DMA)
 105 #define fd_dma_mem_alloc(size)  vdma_mem_alloc(size)
 106 #define fd_dma_setup(addr, size, mode, io) vdma_dma_setup(addr, size, mode, io)
 107
 108 #define fd_enable_irq()           /* nothing... */
 109 #define fd_disable_irq()          /* nothing... */
 110
 111 #define fd_free_dma()             /* nothing */
 112
 113 /* No 64k boundary crossing problems on Q40 - no DMA at all */
 114 #define CROSS_64KB(a,s) (0)
 115
 116 #define DMA_MODE_READ  0x44    /* i386 look-alike */
 117 #define DMA_MODE_WRITE 0x48
 118
 119
 120 static int m68k_floppy_init(void)
 121 {
 122   use_virtual_dma =1;
 123   can_use_virtual_dma = 1;
 124
 125
 126   if (MACH_IS_Q40)
 127           return 0x3f0;
 128   else if(MACH_IS_SUN3X)
 129           return sun3xflop_init();
 130   else
 131     return -1;
 132 }
 133
 134
 135 static int vdma_request_dma(unsigned int dmanr, const char * device_id)
 136 {
 137         return 0;
 138 }
 139
 140
 141 static int vdma_get_dma_residue(unsigned int dummy)
 142 {
 143         return virtual_dma_count + virtual_dma_residue;
 144 }
 145
 146
 147 static unsigned long vdma_mem_alloc(unsigned long size)
 148 {
 149         return (unsigned long) vmalloc(size);
 150
 151 }
 152
 153 static void _fd_dma_mem_free(unsigned long addr, unsigned long size)
 154 {
 155         vfree((void *)addr);
 156 }
 157 #define fd_dma_mem_free(addr,size) _fd_dma_mem_free(addr, size)
 158
 159
 160 /* choose_dma_mode ???*/
 161
 162 static int vdma_dma_setup(char *addr, unsigned long size, int mode, int io)
 163 {
 164         doing_pdma = 1;
 165         virtual_dma_port = (MACH_IS_Q40 ? io : 0);
 166         virtual_dma_mode = (mode  == DMA_MODE_WRITE);
 167         virtual_dma_addr = addr;
 168         virtual_dma_count = size;
 169         virtual_dma_residue = 0;
 170         return 0;
 171 }
 172
 173
 174
 175 static void fd_disable_dma(void)
 176 {
 177         doing_pdma = 0;
 178         virtual_dma_residue += virtual_dma_count;
 179         virtual_dma_count=0;
 180 }
 181
 182
 183
 184 /* this is the only truly Q40 specific function */
 185
 186 asmlinkage irqreturn_t floppy_hardint(int irq, void *dev_id)
 187 {
 188         register unsigned char st;
 189
 190 #undef TRACE_FLPY_INT
 191 #define NO_FLOPPY_ASSEMBLER
 192
 193 #ifdef TRACE_FLPY_INT
 194         static int calls=0;
 195         static int bytes=0;
 196         static int dma_wait=0;
 197 #endif
 198         if(!doing_pdma) {
 199                 floppy_interrupt(irq, dev_id);
 200                 return IRQ_HANDLED;
 201         }
 202
 203 #ifdef TRACE_FLPY_INT
 204         if(!calls)
 205                 bytes = virtual_dma_count;
 206 #endif
 207
 208         {
 209                 register int lcount;
 210                 register char *lptr;
 211
 212                 /* serve 1st byte fast: */
 213
 214                 st=1;
 215                 for(lcount=virtual_dma_count, lptr=virtual_dma_addr;
 216                     lcount; lcount--, lptr++) {
 217                         st=inb(virtual_dma_port+4) & 0xa0 ;
 218                         if(st != 0xa0)
 219                                 break;
 220                         if(virtual_dma_mode)
 221                                 outb_p(*lptr, virtual_dma_port+5);
 222                         else
 223                                 *lptr = inb_p(virtual_dma_port+5);
 224                 }
 225
 226                 virtual_dma_count = lcount;
 227                 virtual_dma_addr = lptr;
 228                 st = inb(virtual_dma_port+4);
 229         }
 230
 231 #ifdef TRACE_FLPY_INT
 232         calls++;
 233 #endif
 234         if(st == 0x20)
 235                 return IRQ_HANDLED;
 236         if(!(st & 0x20)) {
 237                 virtual_dma_residue += virtual_dma_count;
 238                 virtual_dma_count=0;
 239 #ifdef TRACE_FLPY_INT
 240                 printk("count=%x, residue=%x calls=%d bytes=%d dma_wait=%d\n",
 241                        virtual_dma_count, virtual_dma_residue, calls, bytes,
 242                        dma_wait);
 243                 calls = 0;
 244                 dma_wait=0;
 245 #endif
 246                 doing_pdma = 0;
 247                 floppy_interrupt(irq, dev_id);
 248                 return IRQ_HANDLED;
 249         }
 250 #ifdef TRACE_FLPY_INT
 251         if(!virtual_dma_count)
 252                 dma_wait++;
 253 #endif
 254         return IRQ_HANDLED;
 255 }
 256
 257 #define EXTRA_FLOPPY_PARAMS