include/asm-x86/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_X86_FLOPPY_H
  11 #define _ASM_X86_FLOPPY_H
  12
  13 #include <linux/vmalloc.h>
  14
  15 /*
  16  * The DMA channel used by the floppy controller cannot access data at
  17  * addresses >= 16MB
  18  *
  19  * Went back to the 1MB limit, as some people had problems with the floppy
  20  * driver otherwise. It doesn't matter much for performance anyway, as most
  21  * floppy accesses go through the track buffer.
  22  */
  23 #define _CROSS_64KB(a,s,vdma) \
  24 (!(vdma) && ((unsigned long)(a)/K_64 != ((unsigned long)(a) + (s) - 1) / K_64))
  25
  26 #define CROSS_64KB(a,s) _CROSS_64KB(a,s,use_virtual_dma & 1)
  27
  28
  29 #define SW fd_routine[use_virtual_dma&1]
  30 #define CSW fd_routine[can_use_virtual_dma & 1]
  31
  32
  33 #define fd_inb(port)            inb_p(port)
  34 #define fd_outb(value,port)     outb_p(value,port)
  35
  36 #define fd_request_dma()        CSW._request_dma(FLOPPY_DMA,"floppy")
  37 #define fd_free_dma()           CSW._free_dma(FLOPPY_DMA)
  38 #define fd_enable_irq()         enable_irq(FLOPPY_IRQ)
  39 #define fd_disable_irq()        disable_irq(FLOPPY_IRQ)
  40 #define fd_free_irq()           free_irq(FLOPPY_IRQ, NULL)
  41 #define fd_get_dma_residue()    SW._get_dma_residue(FLOPPY_DMA)
  42 #define fd_dma_mem_alloc(size)  SW._dma_mem_alloc(size)
  43 #define fd_dma_setup(addr, size, mode, io) SW._dma_setup(addr, size, mode, io)
  44
  45 #define FLOPPY_CAN_FALLBACK_ON_NODMA
  46
  47 static int virtual_dma_count;
  48 static int virtual_dma_residue;
  49 static char *virtual_dma_addr;
  50 static int virtual_dma_mode;
  51 static int doing_pdma;
  52
  53 static irqreturn_t floppy_hardint(int irq, void *dev_id)
  54 {
  55         register unsigned char st;
  56
  57 #undef TRACE_FLPY_INT
  58
  59 #ifdef TRACE_FLPY_INT
  60         static int calls=0;
  61         static int bytes=0;
  62         static int dma_wait=0;
  63 #endif
  64         if (!doing_pdma)
  65                 return floppy_interrupt(irq, dev_id);
  66
  67 #ifdef TRACE_FLPY_INT
  68         if(!calls)
  69                 bytes = virtual_dma_count;
  70 #endif
  71
  72         {
  73                 register int lcount;
  74                 register char *lptr;
  75
  76                 st = 1;
  77                 for(lcount=virtual_dma_count, lptr=virtual_dma_addr;
  78                     lcount; lcount--, lptr++) {
  79                         st=inb(virtual_dma_port+4) & 0xa0 ;
  80                         if(st != 0xa0)
  81                                 break;
  82                         if(virtual_dma_mode)
  83                                 outb_p(*lptr, virtual_dma_port+5);
  84                         else
  85                                 *lptr = inb_p(virtual_dma_port+5);
  86                 }
  87                 virtual_dma_count = lcount;
  88                 virtual_dma_addr = lptr;
  89                 st = inb(virtual_dma_port+4);
  90         }
  91
  92 #ifdef TRACE_FLPY_INT
  93         calls++;
  94 #endif
  95         if(st == 0x20)
  96                 return IRQ_HANDLED;
  97         if(!(st & 0x20)) {
  98                 virtual_dma_residue += virtual_dma_count;
  99                 virtual_dma_count=0;
 100 #ifdef TRACE_FLPY_INT
 101                 printk("count=%x, residue=%x calls=%d bytes=%d dma_wait=%d\n",
 102                        virtual_dma_count, virtual_dma_residue, calls, bytes,
 103                        dma_wait);
 104                 calls = 0;
 105                 dma_wait=0;
 106 #endif
 107                 doing_pdma = 0;
 108                 floppy_interrupt(irq, dev_id);
 109                 return IRQ_HANDLED;
 110         }
 111 #ifdef TRACE_FLPY_INT
 112         if(!virtual_dma_count)
 113                 dma_wait++;
 114 #endif
 115         return IRQ_HANDLED;
 116 }
 117
 118 static void fd_disable_dma(void)
 119 {
 120         if(! (can_use_virtual_dma & 1))
 121                 disable_dma(FLOPPY_DMA);
 122         doing_pdma = 0;
 123         virtual_dma_residue += virtual_dma_count;
 124         virtual_dma_count=0;
 125 }
 126
 127 static int vdma_request_dma(unsigned int dmanr, const char * device_id)
 128 {
 129         return 0;
 130 }
 131
 132 static void vdma_nop(unsigned int dummy)
 133 {
 134 }
 135
 136
 137 static int vdma_get_dma_residue(unsigned int dummy)
 138 {
 139         return virtual_dma_count + virtual_dma_residue;
 140 }
 141
 142
 143 static int fd_request_irq(void)
 144 {
 145         if(can_use_virtual_dma)
 146                 return request_irq(FLOPPY_IRQ, floppy_hardint,
 147                                    IRQF_DISABLED, "floppy", NULL);
 148         else
 149                 return request_irq(FLOPPY_IRQ, floppy_interrupt,
 150                                    IRQF_DISABLED, "floppy", NULL);
 151 }
 152
 153 static unsigned long dma_mem_alloc(unsigned long size)
 154 {
 155         return __get_dma_pages(GFP_KERNEL|__GFP_NORETRY,get_order(size));
 156 }
 157
 158
 159 static unsigned long vdma_mem_alloc(unsigned long size)
 160 {
 161         return (unsigned long) vmalloc(size);
 162
 163 }
 164
 165 #define nodma_mem_alloc(size) vdma_mem_alloc(size)
 166
 167 static void _fd_dma_mem_free(unsigned long addr, unsigned long size)
 168 {
 169         if((unsigned long) addr >= (unsigned long) high_memory)
 170                 vfree((void *)addr);
 171         else
 172                 free_pages(addr, get_order(size));
 173 }
 174
 175 #define fd_dma_mem_free(addr, size)  _fd_dma_mem_free(addr, size)
 176
 177 static void _fd_chose_dma_mode(char *addr, unsigned long size)
 178 {
 179         if(can_use_virtual_dma == 2) {
 180                 if((unsigned long) addr >= (unsigned long) high_memory ||
 181                    isa_virt_to_bus(addr) >= 0x1000000 ||
 182                    _CROSS_64KB(addr, size, 0))
 183                         use_virtual_dma = 1;
 184                 else
 185                         use_virtual_dma = 0;
 186         } else {
 187                 use_virtual_dma = can_use_virtual_dma & 1;
 188         }
 189 }
 190
 191 #define fd_chose_dma_mode(addr, size) _fd_chose_dma_mode(addr, size)
 192
 193
 194 static int vdma_dma_setup(char *addr, unsigned long size, int mode, int io)
 195 {
 196         doing_pdma = 1;
 197         virtual_dma_port = io;
 198         virtual_dma_mode = (mode  == DMA_MODE_WRITE);
 199         virtual_dma_addr = addr;
 200         virtual_dma_count = size;
 201         virtual_dma_residue = 0;
 202         return 0;
 203 }
 204
 205 static int hard_dma_setup(char *addr, unsigned long size, int mode, int io)
 206 {
 207 #ifdef FLOPPY_SANITY_CHECK
 208         if (CROSS_64KB(addr, size)) {
 209                 printk("DMA crossing 64-K boundary %p-%p\n", addr, addr+size);
 210                 return -1;
 211         }
 212 #endif
 213         /* actual, physical DMA */
 214         doing_pdma = 0;
 215         clear_dma_ff(FLOPPY_DMA);
 216         set_dma_mode(FLOPPY_DMA,mode);
 217         set_dma_addr(FLOPPY_DMA,isa_virt_to_bus(addr));
 218         set_dma_count(FLOPPY_DMA,size);
 219         enable_dma(FLOPPY_DMA);
 220         return 0;
 221 }
 222
 223 static struct fd_routine_l {
 224         int (*_request_dma)(unsigned int dmanr, const char * device_id);
 225         void (*_free_dma)(unsigned int dmanr);
 226         int (*_get_dma_residue)(unsigned int dummy);
 227         unsigned long (*_dma_mem_alloc) (unsigned long size);
 228         int (*_dma_setup)(char *addr, unsigned long size, int mode, int io);
 229 } fd_routine[] = {
 230         {
 231                 request_dma,
 232                 free_dma,
 233                 get_dma_residue,
 234                 dma_mem_alloc,
 235                 hard_dma_setup
 236         },
 237         {
 238                 vdma_request_dma,
 239                 vdma_nop,
 240                 vdma_get_dma_residue,
 241                 vdma_mem_alloc,
 242                 vdma_dma_setup
 243         }
 244 };
 245
 246
 247 static int FDC1 = 0x3f0;
 248 static int FDC2 = -1;
 249
 250 /*
 251  * Floppy types are stored in the rtc's CMOS RAM and so rtc_lock
 252  * is needed to prevent corrupted CMOS RAM in case "insmod floppy"
 253  * coincides with another rtc CMOS user.                Paul G.
 254  */
 255 #define FLOPPY0_TYPE    ({                              \
 256         unsigned long flags;                            \
 257         unsigned char val;                              \
 258         spin_lock_irqsave(&rtc_lock, flags);            \
 259         val = (CMOS_READ(0x10) >> 4) & 15;              \
 260         spin_unlock_irqrestore(&rtc_lock, flags);       \
 261         val;                                            \
 262 })
 263
 264 #define FLOPPY1_TYPE    ({                              \
 265         unsigned long flags;                            \
 266         unsigned char val;                              \
 267         spin_lock_irqsave(&rtc_lock, flags);            \
 268         val = CMOS_READ(0x10) & 15;                     \
 269         spin_unlock_irqrestore(&rtc_lock, flags);       \
 270         val;                                            \
 271 })
 272
 273 #define N_FDC 2
 274 #define N_DRIVE 8
 275
 276 #define EXTRA_FLOPPY_PARAMS
 277
 278 #endif /* _ASM_X86_FLOPPY_H */