include/asm-i386/floppy.h

   1 /*
   2  * 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) 1995
   9  */
  10 #ifndef __ASM_I386_FLOPPY_H
  11 #define __ASM_I386_FLOPPY_H
  12
  13 #include <linux/vmalloc.h>
  14
  15
  16 /*
  17  * The DMA channel used by the floppy controller cannot access data at
  18  * addresses >= 16MB
  19  *
  20  * Went back to the 1MB limit, as some people had problems with the floppy
  21  * driver otherwise. It doesn't matter much for performance anyway, as most
  22  * floppy accesses go through the track buffer.
  23  */
  24 #define _CROSS_64KB(a,s,vdma) \
  25 (!(vdma) && ((unsigned long)(a)/K_64 != ((unsigned long)(a) + (s) - 1) / K_64))
  26
  27 #define CROSS_64KB(a,s) _CROSS_64KB(a,s,use_virtual_dma & 1)
  28
  29
  30 #define SW fd_routine[use_virtual_dma&1]
  31 #define CSW fd_routine[can_use_virtual_dma & 1]
  32
  33
  34 #define fd_inb(port)                    inb_p(port)
  35 #define fd_outb(port,value)             outb_p(port,value)
  36
  37 #define fd_request_dma()        CSW._request_dma(FLOPPY_DMA,"floppy")
  38 #define fd_free_dma()           CSW._free_dma(FLOPPY_DMA)
  39 #define fd_enable_irq()         enable_irq(FLOPPY_IRQ)
  40 #define fd_disable_irq()        disable_irq(FLOPPY_IRQ)
  41 #define fd_free_irq()           free_irq(FLOPPY_IRQ, NULL)
  42 #define fd_get_dma_residue()    SW._get_dma_residue(FLOPPY_DMA)
  43 #define fd_dma_mem_alloc(size)  SW._dma_mem_alloc(size)
  44 #define fd_dma_setup(addr, size, mode, io) SW._dma_setup(addr, size, mode, io)
  45
  46 #define FLOPPY_CAN_FALLBACK_ON_NODMA
  47
  48 static int virtual_dma_count;
  49 static int virtual_dma_residue;
  50 static char *virtual_dma_addr;
  51 static int virtual_dma_mode;
  52 static int doing_pdma;
  53
  54 static void floppy_hardint(int irq, void *dev_id, struct pt_regs * regs)
  55 {
  56         register unsigned char st;
  57
  58 #undef TRACE_FLPY_INT
  59 #define NO_FLOPPY_ASSEMBLER
  60
  61 #ifdef TRACE_FLPY_INT
  62         static int calls=0;
  63         static int bytes=0;
  64         static int dma_wait=0;
  65 #endif
  66         if(!doing_pdma) {
  67                 floppy_interrupt(irq, dev_id, regs);
  68                 return;
  69         }
  70
  71 #ifdef TRACE_FLPY_INT
  72         if(!calls)
  73                 bytes = virtual_dma_count;
  74 #endif
  75
  76 #ifndef NO_FLOPPY_ASSEMBLER
  77         __asm__ (
  78        "testl %1,%1"
  79         "je 3f"
  80 "1:     inb %w4,%b0"
  81         "andb $160,%b0"
  82         "cmpb $160,%b0"
  83         "jne 2f"
  84         "incw %w4"
  85         "testl %3,%3"
  86         "jne 4f"
  87         "inb %w4,%b0"
  88         "movb %0,(%2)"
  89         "jmp 5f"
  90 "4:     movb (%2),%0"
  91         "outb %b0,%w4"
  92 "5:     decw %w4"
  93         "outb %0,$0x80"
  94         "decl %1"
  95         "incl %2"
  96         "testl %1,%1"
  97         "jne 1b"
  98 "3:     inb %w4,%b0"
  99 "2:     "
 100        : "=a" ((char) st),
 101        "=c" ((long) virtual_dma_count),
 102        "=S" ((long) virtual_dma_addr)
 103        : "b" ((long) virtual_dma_mode),
 104        "d" ((short) virtual_dma_port+4),
 105        "1" ((long) virtual_dma_count),
 106        "2" ((long) virtual_dma_addr));
 107 #else
 108         {
 109                 register int lcount;
 110                 register char *lptr;
 111
 112                 st = 1;
 113                 for(lcount=virtual_dma_count, lptr=virtual_dma_addr;
 114                     lcount; lcount--, lptr++) {
 115                         st=inb(virtual_dma_port+4) & 0xa0 ;
 116                         if(st != 0xa0)
 117                                 break;
 118                         if(virtual_dma_mode)
 119                                 outb_p(*lptr, virtual_dma_port+5);
 120                         else
 121                                 *lptr = inb_p(virtual_dma_port+5);
 122                 }
 123                 virtual_dma_count = lcount;
 124                 virtual_dma_addr = lptr;
 125                 st = inb(virtual_dma_port+4);
 126         }
 127 #endif
 128
 129 #ifdef TRACE_FLPY_INT
 130         calls++;
 131 #endif
 132         if(st == 0x20)
 133                 return;
 134         if(!(st & 0x20)) {
 135                 virtual_dma_residue += virtual_dma_count;
 136                 virtual_dma_count=0;
 137 #ifdef TRACE_FLPY_INT
 138                 printk("count=%x, residue=%x calls=%d bytes=%d dma_wait=%d\n",
 139                        virtual_dma_count, virtual_dma_residue, calls, bytes,
 140                        dma_wait);
 141                 calls = 0;
 142                 dma_wait=0;
 143 #endif
 144                 doing_pdma = 0;
 145                 floppy_interrupt(irq, dev_id, regs);
 146                 return;
 147         }
 148 #ifdef TRACE_FLPY_INT
 149         if(!virtual_dma_count)
 150                 dma_wait++;
 151 #endif
 152 }
 153
 154 static void fd_disable_dma(void)
 155 {
 156         if(! (can_use_virtual_dma & 1))
 157                 disable_dma(FLOPPY_DMA);
 158         doing_pdma = 0;
 159         virtual_dma_residue += virtual_dma_count;
 160         virtual_dma_count=0;
 161 }
 162
 163 static int vdma_request_dma(unsigned int dmanr, const char * device_id)
 164 {
 165         return 0;
 166 }
 167
 168 static void vdma_nop(unsigned int dummy)
 169 {
 170 }
 171
 172
 173 static int vdma_get_dma_residue(unsigned int dummy)
 174 {
 175         return virtual_dma_count + virtual_dma_residue;
 176 }
 177
 178
 179 static int fd_request_irq(void)
 180 {
 181         if(can_use_virtual_dma)
 182                 return request_irq(FLOPPY_IRQ, floppy_hardint,SA_INTERRUPT,
 183                                                    "floppy", NULL);
 184         else
 185                 return request_irq(FLOPPY_IRQ, floppy_interrupt,
 186                                                    SA_INTERRUPT|SA_SAMPLE_RANDOM,
 187                                                    "floppy", NULL);
 188
 189 }
 190
 191 static unsigned long dma_mem_alloc(unsigned long size)
 192 {
 193         return __get_dma_pages(GFP_KERNEL,get_order(size));
 194 }
 195
 196
 197 static unsigned long vdma_mem_alloc(unsigned long size)
 198 {
 199         return (unsigned long) vmalloc(size);
 200
 201 }
 202
 203 #define nodma_mem_alloc(size) vdma_mem_alloc(size)
 204
 205 static void _fd_dma_mem_free(unsigned long addr, unsigned long size)
 206 {
 207         if((unsigned int) addr >= (unsigned int) high_memory)
 208                 return vfree((void *)addr);
 209         else
 210                 free_pages(addr, get_order(size));
 211 }
 212
 213 #define fd_dma_mem_free(addr, size)  _fd_dma_mem_free(addr, size)
 214
 215 static void _fd_chose_dma_mode(char *addr, unsigned long size)
 216 {
 217         if(can_use_virtual_dma == 2) {
 218                 if((unsigned int) addr >= (unsigned int) high_memory ||
 219                    virt_to_bus(addr) >= 0x1000000 ||
 220                    _CROSS_64KB(addr, size, 0))
 221                         use_virtual_dma = 1;
 222                 else
 223                         use_virtual_dma = 0;
 224         } else {
 225                 use_virtual_dma = can_use_virtual_dma & 1;
 226         }
 227 }
 228
 229 #define fd_chose_dma_mode(addr, size) _fd_chose_dma_mode(addr, size)
 230
 231
 232 static int vdma_dma_setup(char *addr, unsigned long size, int mode, int io)
 233 {
 234         doing_pdma = 1;
 235         virtual_dma_port = io;
 236         virtual_dma_mode = (mode  == DMA_MODE_WRITE);
 237         virtual_dma_addr = addr;
 238         virtual_dma_count = size;
 239         virtual_dma_residue = 0;
 240         return 0;
 241 }
 242
 243 static int hard_dma_setup(char *addr, unsigned long size, int mode, int io)
 244 {
 245 #ifdef FLOPPY_SANITY_CHECK
 246         if (CROSS_64KB(addr, size)) {
 247                 printk("DMA crossing 64-K boundary %p-%p\n", addr, addr+size);
 248                 return -1;
 249         }
 250 #endif
 251         /* actual, physical DMA */
 252         doing_pdma = 0;
 253         clear_dma_ff(FLOPPY_DMA);
 254         set_dma_mode(FLOPPY_DMA,mode);
 255         set_dma_addr(FLOPPY_DMA,virt_to_bus(addr));
 256         set_dma_count(FLOPPY_DMA,size);
 257         enable_dma(FLOPPY_DMA);
 258         return 0;
 259 }
 260
 261 struct fd_routine_l {
 262         int (*_request_dma)(unsigned int dmanr, const char * device_id);
 263         void (*_free_dma)(unsigned int dmanr);
 264         int (*_get_dma_residue)(unsigned int dummy);
 265         unsigned long (*_dma_mem_alloc) (unsigned long size);
 266         int (*_dma_setup)(char *addr, unsigned long size, int mode, int io);
 267 } fd_routine[] = {
 268         {
 269                 request_dma,
 270                 free_dma,
 271                 get_dma_residue,
 272                 dma_mem_alloc,
 273                 hard_dma_setup
 274         },
 275         {
 276                 vdma_request_dma,
 277                 vdma_nop,
 278                 vdma_get_dma_residue,
 279                 vdma_mem_alloc,
 280                 vdma_dma_setup
 281         }
 282 };
 283
 284
 285 static int FDC1 = 0x3f0;
 286 static int FDC2 = -1;
 287
 288 /*
 289  * Floppy types are stored in the rtc's CMOS RAM and so rtc_lock
 290  * is needed to prevent corrupted CMOS RAM in case "insmod floppy"
 291  * coincides with another rtc CMOS user.                Paul G.
 292  */
 293 #define FLOPPY0_TYPE    ({                              \
 294         unsigned long flags;                            \
 295         unsigned char val;                              \
 296         spin_lock_irqsave(&rtc_lock, flags);            \
 297         val = (CMOS_READ(0x10) >> 4) & 15;              \
 298         spin_unlock_irqrestore(&rtc_lock, flags);       \
 299         val;                                            \
 300 })
 301
 302 #define FLOPPY1_TYPE    ({                              \
 303         unsigned long flags;                            \
 304         unsigned char val;                              \
 305         spin_lock_irqsave(&rtc_lock, flags);            \
 306         val = CMOS_READ(0x10) & 15;                     \
 307         spin_unlock_irqrestore(&rtc_lock, flags);       \
 308         val;                                            \
 309 })
 310
 311 #define N_FDC 2
 312 #define N_DRIVE 8
 313
 314 #define FLOPPY_MOTOR_MASK 0xf0
 315
 316 #define AUTO_DMA
 317
 318 #define EXTRA_FLOPPY_PARAMS
 319
 320 #endif /* __ASM_I386_FLOPPY_H */