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
  60 #ifdef TRACE_FLPY_INT
  61         static int calls=0;
  62         static int bytes=0;
  63         static int dma_wait=0;
  64 #endif
  65         if (!doing_pdma)
  66                 return floppy_interrupt(irq, dev_id, regs);
  67
  68 #ifdef TRACE_FLPY_INT
  69         if(!calls)
  70                 bytes = virtual_dma_count;
  71 #endif
  72
  73         {
  74                 register int lcount;
  75                 register char *lptr;
  76
  77                 st = 1;
  78                 for(lcount=virtual_dma_count, lptr=virtual_dma_addr;
  79                     lcount; lcount--, lptr++) {
  80                         st=inb(virtual_dma_port+4) & 0xa0 ;
  81                         if(st != 0xa0)
  82                                 break;
  83                         if(virtual_dma_mode)
  84                                 outb_p(*lptr, virtual_dma_port+5);
  85                         else
  86                                 *lptr = inb_p(virtual_dma_port+5);
  87                 }
  88                 virtual_dma_count = lcount;
  89                 virtual_dma_addr = lptr;
  90                 st = inb(virtual_dma_port+4);
  91         }
  92
  93 #ifdef TRACE_FLPY_INT
  94         calls++;
  95 #endif
  96         if(st == 0x20)
  97                 return IRQ_HANDLED;
  98         if(!(st & 0x20)) {
  99                 virtual_dma_residue += virtual_dma_count;
 100                 virtual_dma_count=0;
 101 #ifdef TRACE_FLPY_INT
 102                 printk("count=%x, residue=%x calls=%d bytes=%d dma_wait=%d\n",
 103                        virtual_dma_count, virtual_dma_residue, calls, bytes,
 104                        dma_wait);
 105                 calls = 0;
 106                 dma_wait=0;
 107 #endif
 108                 doing_pdma = 0;
 109                 floppy_interrupt(irq, dev_id, regs);
 110                 return IRQ_HANDLED;
 111         }
 112 #ifdef TRACE_FLPY_INT
 113         if(!virtual_dma_count)
 114                 dma_wait++;
 115 #endif
 116         return IRQ_HANDLED;
 117 }
 118
 119 static void fd_disable_dma(void)
 120 {
 121         if(! (can_use_virtual_dma & 1))
 122                 disable_dma(FLOPPY_DMA);
 123         doing_pdma = 0;
 124         virtual_dma_residue += virtual_dma_count;
 125         virtual_dma_count=0;
 126 }
 127
 128 static int vdma_request_dma(unsigned int dmanr, const char * device_id)
 129 {
 130         return 0;
 131 }
 132
 133 static void vdma_nop(unsigned int dummy)
 134 {
 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 int fd_request_irq(void)
 145 {
 146         if(can_use_virtual_dma)
 147                 return request_irq(FLOPPY_IRQ, floppy_hardint,SA_INTERRUPT,
 148                                                    "floppy", NULL);
 149         else
 150                 return request_irq(FLOPPY_IRQ, floppy_interrupt,
 151                                                    SA_INTERRUPT|SA_SAMPLE_RANDOM,
 152                                                    "floppy", NULL);
 153
 154 }
 155
 156 static unsigned long dma_mem_alloc(unsigned long size)
 157 {
 158         return __get_dma_pages(GFP_KERNEL,get_order(size));
 159 }
 160
 161
 162 static unsigned long vdma_mem_alloc(unsigned long size)
 163 {
 164         return (unsigned long) vmalloc(size);
 165
 166 }
 167
 168 #define nodma_mem_alloc(size) vdma_mem_alloc(size)
 169
 170 static void _fd_dma_mem_free(unsigned long addr, unsigned long size)
 171 {
 172         if((unsigned int) addr >= (unsigned int) high_memory)
 173                 vfree((void *)addr);
 174         else
 175                 free_pages(addr, get_order(size));
 176 }
 177
 178 #define fd_dma_mem_free(addr, size)  _fd_dma_mem_free(addr, size)
 179
 180 static void _fd_chose_dma_mode(char *addr, unsigned long size)
 181 {
 182         if(can_use_virtual_dma == 2) {
 183                 if((unsigned int) addr >= (unsigned int) high_memory ||
 184                    isa_virt_to_bus(addr) >= 0x1000000 ||
 185                    _CROSS_64KB(addr, size, 0))
 186                         use_virtual_dma = 1;
 187                 else
 188                         use_virtual_dma = 0;
 189         } else {
 190                 use_virtual_dma = can_use_virtual_dma & 1;
 191         }
 192 }
 193
 194 #define fd_chose_dma_mode(addr, size) _fd_chose_dma_mode(addr, size)
 195
 196
 197 static int vdma_dma_setup(char *addr, unsigned long size, int mode, int io)
 198 {
 199         doing_pdma = 1;
 200         virtual_dma_port = io;
 201         virtual_dma_mode = (mode  == DMA_MODE_WRITE);
 202         virtual_dma_addr = addr;
 203         virtual_dma_count = size;
 204         virtual_dma_residue = 0;
 205         return 0;
 206 }
 207
 208 static int hard_dma_setup(char *addr, unsigned long size, int mode, int io)
 209 {
 210 #ifdef FLOPPY_SANITY_CHECK
 211         if (CROSS_64KB(addr, size)) {
 212                 printk("DMA crossing 64-K boundary %p-%p\n", addr, addr+size);
 213                 return -1;
 214         }
 215 #endif
 216         /* actual, physical DMA */
 217         doing_pdma = 0;
 218         clear_dma_ff(FLOPPY_DMA);
 219         set_dma_mode(FLOPPY_DMA,mode);
 220         set_dma_addr(FLOPPY_DMA,isa_virt_to_bus(addr));
 221         set_dma_count(FLOPPY_DMA,size);
 222         enable_dma(FLOPPY_DMA);
 223         return 0;
 224 }
 225
 226 static struct fd_routine_l {
 227         int (*_request_dma)(unsigned int dmanr, const char * device_id);
 228         void (*_free_dma)(unsigned int dmanr);
 229         int (*_get_dma_residue)(unsigned int dummy);
 230         unsigned long (*_dma_mem_alloc) (unsigned long size);
 231         int (*_dma_setup)(char *addr, unsigned long size, int mode, int io);
 232 } fd_routine[] = {
 233         {
 234                 request_dma,
 235                 free_dma,
 236                 get_dma_residue,
 237                 dma_mem_alloc,
 238                 hard_dma_setup
 239         },
 240         {
 241                 vdma_request_dma,
 242                 vdma_nop,
 243                 vdma_get_dma_residue,
 244                 vdma_mem_alloc,
 245                 vdma_dma_setup
 246         }
 247 };
 248
 249
 250 static int FDC1 = 0x3f0;
 251 static int FDC2 = -1;
 252
 253 /*
 254  * Floppy types are stored in the rtc's CMOS RAM and so rtc_lock
 255  * is needed to prevent corrupted CMOS RAM in case "insmod floppy"
 256  * coincides with another rtc CMOS user.                Paul G.
 257  */
 258 #define FLOPPY0_TYPE    ({                              \
 259         unsigned long flags;                            \
 260         unsigned char val;                              \
 261         spin_lock_irqsave(&rtc_lock, flags);            \
 262         val = (CMOS_READ(0x10) >> 4) & 15;              \
 263         spin_unlock_irqrestore(&rtc_lock, flags);       \
 264         val;                                            \
 265 })
 266
 267 #define FLOPPY1_TYPE    ({                              \
 268         unsigned long flags;                            \
 269         unsigned char val;                              \
 270         spin_lock_irqsave(&rtc_lock, flags);            \
 271         val = CMOS_READ(0x10) & 15;                     \
 272         spin_unlock_irqrestore(&rtc_lock, flags);       \
 273         val;                                            \
 274 })
 275
 276 #define N_FDC 2
 277 #define N_DRIVE 8
 278
 279 #define FLOPPY_MOTOR_MASK 0xf0
 280
 281 #define AUTO_DMA
 282
 283 #define EXTRA_FLOPPY_PARAMS
 284
 285 #endif /* __ASM_I386_FLOPPY_H */