arch/m68k/include/asm/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 /* basically PC init + set use_virtual_dma */
  35 #define  FDC1 m68k_floppy_init()
  36
  37 #define N_FDC 1
  38 #define N_DRIVE 8
  39
  40
  41 /* vdma globals adapted from asm-i386/floppy.h */
  42
  43 static int virtual_dma_count=0;
  44 static int virtual_dma_residue=0;
  45 static char *virtual_dma_addr=NULL;
  46 static int virtual_dma_mode=0;
  47 static int doing_pdma=0;
  48
  49 #include <asm/sun3xflop.h>
  50
  51 extern spinlock_t  dma_spin_lock;
  52
  53 static __inline__ unsigned long claim_dma_lock(void)
  54 {
  55         unsigned long flags;
  56         spin_lock_irqsave(&dma_spin_lock, flags);
  57         return flags;
  58 }
  59
  60 static __inline__ void release_dma_lock(unsigned long flags)
  61 {
  62         spin_unlock_irqrestore(&dma_spin_lock, flags);
  63 }
  64
  65
  66 static __inline__ unsigned char fd_inb(int port)
  67 {
  68         if(MACH_IS_Q40)
  69                 return inb_p(port);
  70         else if(MACH_IS_SUN3X)
  71                 return sun3x_82072_fd_inb(port);
  72         return 0;
  73 }
  74
  75 static __inline__ void fd_outb(unsigned char value, int port)
  76 {
  77         if(MACH_IS_Q40)
  78                 outb_p(value, port);
  79         else if(MACH_IS_SUN3X)
  80                 sun3x_82072_fd_outb(value, port);
  81 }
  82
  83
  84 static int fd_request_irq(void)
  85 {
  86         if(MACH_IS_Q40)
  87                 return request_irq(FLOPPY_IRQ, floppy_hardint,
  88                                    IRQF_DISABLED, "floppy", floppy_hardint);
  89         else if(MACH_IS_SUN3X)
  90                 return sun3xflop_request_irq();
  91         return -ENXIO;
  92 }
  93
  94 static void fd_free_irq(void)
  95 {
  96         if(MACH_IS_Q40)
  97                 free_irq(FLOPPY_IRQ, floppy_hardint);
  98 }
  99
 100 #define fd_request_dma()        vdma_request_dma(FLOPPY_DMA,"floppy")
 101 #define fd_get_dma_residue()    vdma_get_dma_residue(FLOPPY_DMA)
 102 #define fd_dma_mem_alloc(size)  vdma_mem_alloc(size)
 103 #define fd_dma_setup(addr, size, mode, io) vdma_dma_setup(addr, size, mode, io)
 104
 105 #define fd_enable_irq()           /* nothing... */
 106 #define fd_disable_irq()          /* nothing... */
 107
 108 #define fd_free_dma()             /* nothing */
 109
 110 /* No 64k boundary crossing problems on Q40 - no DMA at all */
 111 #define CROSS_64KB(a,s) (0)
 112
 113 #define DMA_MODE_READ  0x44    /* i386 look-alike */
 114 #define DMA_MODE_WRITE 0x48
 115
 116
 117 static int m68k_floppy_init(void)
 118 {
 119   use_virtual_dma =1;
 120   can_use_virtual_dma = 1;
 121
 122
 123   if (MACH_IS_Q40)
 124           return 0x3f0;
 125   else if(MACH_IS_SUN3X)
 126           return sun3xflop_init();
 127   else
 128     return -1;
 129 }
 130
 131
 132 static int vdma_request_dma(unsigned int dmanr, const char * device_id)
 133 {
 134         return 0;
 135 }
 136
 137
 138 static int vdma_get_dma_residue(unsigned int dummy)
 139 {
 140         return virtual_dma_count + virtual_dma_residue;
 141 }
 142
 143
 144 static unsigned long vdma_mem_alloc(unsigned long size)
 145 {
 146         return (unsigned long) vmalloc(size);
 147
 148 }
 149
 150 static void _fd_dma_mem_free(unsigned long addr, unsigned long size)
 151 {
 152         vfree((void *)addr);
 153 }
 154 #define fd_dma_mem_free(addr,size) _fd_dma_mem_free(addr, size)
 155
 156
 157 /* choose_dma_mode ???*/
 158
 159 static int vdma_dma_setup(char *addr, unsigned long size, int mode, int io)
 160 {
 161         doing_pdma = 1;
 162         virtual_dma_port = (MACH_IS_Q40 ? io : 0);
 163         virtual_dma_mode = (mode  == DMA_MODE_WRITE);
 164         virtual_dma_addr = addr;
 165         virtual_dma_count = size;
 166         virtual_dma_residue = 0;
 167         return 0;
 168 }
 169
 170
 171
 172 static void fd_disable_dma(void)
 173 {
 174         doing_pdma = 0;
 175         virtual_dma_residue += virtual_dma_count;
 176         virtual_dma_count=0;
 177 }
 178
 179
 180
 181 /* this is the only truly Q40 specific function */
 182
 183 asmlinkage irqreturn_t floppy_hardint(int irq, void *dev_id)
 184 {
 185         register unsigned char st;
 186
 187 #undef TRACE_FLPY_INT
 188 #define NO_FLOPPY_ASSEMBLER
 189
 190 #ifdef TRACE_FLPY_INT
 191         static int calls=0;
 192         static int bytes=0;
 193         static int dma_wait=0;
 194 #endif
 195         if(!doing_pdma) {
 196                 floppy_interrupt(irq, dev_id);
 197                 return IRQ_HANDLED;
 198         }
 199
 200 #ifdef TRACE_FLPY_INT
 201         if(!calls)
 202                 bytes = virtual_dma_count;
 203 #endif
 204
 205         {
 206                 register int lcount;
 207                 register char *lptr;
 208
 209                 /* serve 1st byte fast: */
 210
 211                 st=1;
 212                 for(lcount=virtual_dma_count, lptr=virtual_dma_addr;
 213                     lcount; lcount--, lptr++) {
 214                         st=inb(virtual_dma_port+4) & 0xa0 ;
 215                         if(st != 0xa0)
 216                                 break;
 217                         if(virtual_dma_mode)
 218                                 outb_p(*lptr, virtual_dma_port+5);
 219                         else
 220                                 *lptr = inb_p(virtual_dma_port+5);
 221                 }
 222
 223                 virtual_dma_count = lcount;
 224                 virtual_dma_addr = lptr;
 225                 st = inb(virtual_dma_port+4);
 226         }
 227
 228 #ifdef TRACE_FLPY_INT
 229         calls++;
 230 #endif
 231         if(st == 0x20)
 232                 return IRQ_HANDLED;
 233         if(!(st & 0x20)) {
 234                 virtual_dma_residue += virtual_dma_count;
 235                 virtual_dma_count=0;
 236 #ifdef TRACE_FLPY_INT
 237                 printk("count=%x, residue=%x calls=%d bytes=%d dma_wait=%d\n",
 238                        virtual_dma_count, virtual_dma_residue, calls, bytes,
 239                        dma_wait);
 240                 calls = 0;
 241                 dma_wait=0;
 242 #endif
 243                 doing_pdma = 0;
 244                 floppy_interrupt(irq, dev_id);
 245                 return IRQ_HANDLED;
 246         }
 247 #ifdef TRACE_FLPY_INT
 248         if(!virtual_dma_count)
 249                 dma_wait++;
 250 #endif
 251         return IRQ_HANDLED;
 252 }
 253
 254 #define EXTRA_FLOPPY_PARAMS