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(value,port)             outb_p(value,port)
  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 irqreturn_t 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                 return floppy_interrupt(irq, dev_id, regs);
  68
  69 #ifdef TRACE_FLPY_INT
  70         if(!calls)
  71                 bytes = virtual_dma_count;
  72 #endif
  73
  74 #ifndef NO_FLOPPY_ASSEMBLER
  75         __asm__ (
  76        "testl %1,%1"
  77         "je 3f"
  78 "1:     inb %w4,%b0"
  79         "andb $160,%b0"
  80         "cmpb $160,%b0"
  81         "jne 2f"
  82         "incw %w4"
  83         "testl %3,%3"
  84         "jne 4f"
  85         "inb %w4,%b0"
  86         "movb %0,(%2)"
  87         "jmp 5f"
  88 "4:     movb (%2),%0"
  89         "outb %b0,%w4"
  90 "5:     decw %w4"
  91         "outb %0,$0x80"
  92         "decl %1"
  93         "incl %2"
  94         "testl %1,%1"
  95         "jne 1b"
  96 "3:     inb %w4,%b0"
  97 "2:     "
  98        : "=a" ((char) st),
  99        "=c" ((long) virtual_dma_count),
 100        "=S" ((long) virtual_dma_addr)
 101        : "b" ((long) virtual_dma_mode),
 102        "d" ((short) virtual_dma_port+4),
 103        "1" ((long) virtual_dma_count),
 104        "2" ((long) virtual_dma_addr));
 105 #else
 106         {
 107                 register int lcount;
 108                 register char *lptr;
 109
 110                 st = 1;
 111                 for(lcount=virtual_dma_count, lptr=virtual_dma_addr;
 112                     lcount; lcount--, lptr++) {
 113                         st=inb(virtual_dma_port+4) & 0xa0 ;
 114                         if(st != 0xa0)
 115                                 break;
 116                         if(virtual_dma_mode)
 117                                 outb_p(*lptr, virtual_dma_port+5);
 118                         else
 119                                 *lptr = inb_p(virtual_dma_port+5);
 120                 }
 121                 virtual_dma_count = lcount;
 122                 virtual_dma_addr = lptr;
 123                 st = inb(virtual_dma_port+4);
 124         }
 125 #endif
 126
 127 #ifdef TRACE_FLPY_INT
 128         calls++;
 129 #endif
 130         if(st == 0x20)
 131                 return IRQ_HANDLED;
 132         if(!(st & 0x20)) {
 133                 virtual_dma_residue += virtual_dma_count;
 134                 virtual_dma_count=0;
 135 #ifdef TRACE_FLPY_INT
 136                 printk("count=%x, residue=%x calls=%d bytes=%d dma_wait=%d\n",
 137                        virtual_dma_count, virtual_dma_residue, calls, bytes,
 138                        dma_wait);
 139                 calls = 0;
 140                 dma_wait=0;
 141 #endif
 142                 doing_pdma = 0;
 143                 floppy_interrupt(irq, dev_id, regs);
 144                 return IRQ_HANDLED;
 145         }
 146 #ifdef TRACE_FLPY_INT
 147         if(!virtual_dma_count)
 148                 dma_wait++;
 149 #endif
 150         return IRQ_HANDLED;
 151 }
 152
 153 static void fd_disable_dma(void)
 154 {
 155         if(! (can_use_virtual_dma & 1))
 156                 disable_dma(FLOPPY_DMA);
 157         doing_pdma = 0;
 158         virtual_dma_residue += virtual_dma_count;
 159         virtual_dma_count=0;
 160 }
 161
 162 static int vdma_request_dma(unsigned int dmanr, const char * device_id)
 163 {
 164         return 0;
 165 }
 166
 167 static void vdma_nop(unsigned int dummy)
 168 {
 169 }
 170
 171
 172 static int vdma_get_dma_residue(unsigned int dummy)
 173 {
 174         return virtual_dma_count + virtual_dma_residue;
 175 }
 176
 177
 178 static int fd_request_irq(void)
 179 {
 180         if(can_use_virtual_dma)
 181                 return request_irq(FLOPPY_IRQ, floppy_hardint,SA_INTERRUPT,
 182                                                    "floppy", NULL);
 183         else
 184                 return request_irq(FLOPPY_IRQ, floppy_interrupt,
 185                                                    SA_INTERRUPT|SA_SAMPLE_RANDOM,
 186                                                    "floppy", NULL);
 187
 188 }
 189
 190 static unsigned long dma_mem_alloc(unsigned long size)
 191 {
 192         return __get_dma_pages(GFP_KERNEL,get_order(size));
 193 }
 194
 195
 196 static unsigned long vdma_mem_alloc(unsigned long size)
 197 {
 198         return (unsigned long) vmalloc(size);
 199
 200 }
 201
 202 #define nodma_mem_alloc(size) vdma_mem_alloc(size)
 203
 204 static void _fd_dma_mem_free(unsigned long addr, unsigned long size)
 205 {
 206         if((unsigned int) addr >= (unsigned int) high_memory)
 207                 vfree((void *)addr);
 208         else
 209                 free_pages(addr, get_order(size));
 210 }
 211
 212 #define fd_dma_mem_free(addr, size)  _fd_dma_mem_free(addr, size)
 213
 214 static void _fd_chose_dma_mode(char *addr, unsigned long size)
 215 {
 216         if(can_use_virtual_dma == 2) {
 217                 if((unsigned int) addr >= (unsigned int) high_memory ||
 218                    isa_virt_to_bus(addr) >= 0x1000000 ||
 219                    _CROSS_64KB(addr, size, 0))
 220                         use_virtual_dma = 1;
 221                 else
 222                         use_virtual_dma = 0;
 223         } else {
 224                 use_virtual_dma = can_use_virtual_dma & 1;
 225         }
 226 }
 227
 228 #define fd_chose_dma_mode(addr, size) _fd_chose_dma_mode(addr, size)
 229
 230
 231 static int vdma_dma_setup(char *addr, unsigned long size, int mode, int io)
 232 {
 233         doing_pdma = 1;
 234         virtual_dma_port = io;
 235         virtual_dma_mode = (mode  == DMA_MODE_WRITE);
 236         virtual_dma_addr = addr;
 237         virtual_dma_count = size;
 238         virtual_dma_residue = 0;
 239         return 0;
 240 }
 241
 242 static int hard_dma_setup(char *addr, unsigned long size, int mode, int io)
 243 {
 244 #ifdef FLOPPY_SANITY_CHECK
 245         if (CROSS_64KB(addr, size)) {
 246                 printk("DMA crossing 64-K boundary %p-%p\n", addr, addr+size);
 247                 return -1;
 248         }
 249 #endif
 250         /* actual, physical DMA */
 251         doing_pdma = 0;
 252         clear_dma_ff(FLOPPY_DMA);
 253         set_dma_mode(FLOPPY_DMA,mode);
 254         set_dma_addr(FLOPPY_DMA,isa_virt_to_bus(addr));
 255         set_dma_count(FLOPPY_DMA,size);
 256         enable_dma(FLOPPY_DMA);
 257         return 0;
 258 }
 259
 260 static struct fd_routine_l {
 261         int (*_request_dma)(unsigned int dmanr, const char * device_id);
 262         void (*_free_dma)(unsigned int dmanr);
 263         int (*_get_dma_residue)(unsigned int dummy);
 264         unsigned long (*_dma_mem_alloc) (unsigned long size);
 265         int (*_dma_setup)(char *addr, unsigned long size, int mode, int io);
 266 } fd_routine[] = {
 267         {
 268                 request_dma,
 269                 free_dma,
 270                 get_dma_residue,
 271                 dma_mem_alloc,
 272                 hard_dma_setup
 273         },
 274         {
 275                 vdma_request_dma,
 276                 vdma_nop,
 277                 vdma_get_dma_residue,
 278                 vdma_mem_alloc,
 279                 vdma_dma_setup
 280         }
 281 };
 282
 283
 284 static int FDC1 = 0x3f0;
 285 static int FDC2 = -1;
 286
 287 /*
 288  * Floppy types are stored in the rtc's CMOS RAM and so rtc_lock
 289  * is needed to prevent corrupted CMOS RAM in case "insmod floppy"
 290  * coincides with another rtc CMOS user.                Paul G.
 291  */
 292 #define FLOPPY0_TYPE    ({                              \
 293         unsigned long flags;                            \
 294         unsigned char val;                              \
 295         spin_lock_irqsave(&rtc_lock, flags);            \
 296         val = (CMOS_READ(0x10) >> 4) & 15;              \
 297         spin_unlock_irqrestore(&rtc_lock, flags);       \
 298         val;                                            \
 299 })
 300
 301 #define FLOPPY1_TYPE    ({                              \
 302         unsigned long flags;                            \
 303         unsigned char val;                              \
 304         spin_lock_irqsave(&rtc_lock, flags);            \
 305         val = CMOS_READ(0x10) & 15;                     \
 306         spin_unlock_irqrestore(&rtc_lock, flags);       \
 307         val;                                            \
 308 })
 309
 310 #define N_FDC 2
 311 #define N_DRIVE 8
 312
 313 #define FLOPPY_MOTOR_MASK 0xf0
 314
 315 #define AUTO_DMA
 316
 317 #define EXTRA_FLOPPY_PARAMS
 318
 319 #endif /* __ASM_I386_FLOPPY_H */