include/asm-x86_64/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_64_FLOPPY_H
  11 #define __ASM_X86_64_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
  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                 floppy_interrupt(irq, dev_id, regs);
  67                 return;
  68         }
  69
  70 #ifdef TRACE_FLPY_INT
  71         if(!calls)
  72                 bytes = virtual_dma_count;
  73 #endif
  74
  75         {
  76                 register int lcount;
  77                 register char *lptr;
  78
  79                 st = 1;
  80                 for(lcount=virtual_dma_count, lptr=virtual_dma_addr;
  81                     lcount; lcount--, lptr++) {
  82                         st=inb(virtual_dma_port+4) & 0xa0 ;
  83                         if(st != 0xa0)
  84                                 break;
  85                         if(virtual_dma_mode)
  86                                 outb_p(*lptr, virtual_dma_port+5);
  87                         else
  88                                 *lptr = inb_p(virtual_dma_port+5);
  89                 }
  90                 virtual_dma_count = lcount;
  91                 virtual_dma_addr = lptr;
  92                 st = inb(virtual_dma_port+4);
  93         }
  94
  95 #ifdef TRACE_FLPY_INT
  96         calls++;
  97 #endif
  98         if(st == 0x20)
  99                 return;
 100         if(!(st & 0x20)) {
 101                 virtual_dma_residue += virtual_dma_count;
 102                 virtual_dma_count=0;
 103 #ifdef TRACE_FLPY_INT
 104                 printk("count=%x, residue=%x calls=%d bytes=%d dma_wait=%d\n",
 105                        virtual_dma_count, virtual_dma_residue, calls, bytes,
 106                        dma_wait);
 107                 calls = 0;
 108                 dma_wait=0;
 109 #endif
 110                 doing_pdma = 0;
 111                 floppy_interrupt(irq, dev_id, regs);
 112                 return;
 113         }
 114 #ifdef TRACE_FLPY_INT
 115         if(!virtual_dma_count)
 116                 dma_wait++;
 117 #endif
 118 }
 119
 120 static void fd_disable_dma(void)
 121 {
 122         if(! (can_use_virtual_dma & 1))
 123                 disable_dma(FLOPPY_DMA);
 124         doing_pdma = 0;
 125         virtual_dma_residue += virtual_dma_count;
 126         virtual_dma_count=0;
 127 }
 128
 129 static int vdma_request_dma(unsigned int dmanr, const char * device_id)
 130 {
 131         return 0;
 132 }
 133
 134 static void vdma_nop(unsigned int dummy)
 135 {
 136 }
 137
 138
 139 static int vdma_get_dma_residue(unsigned int dummy)
 140 {
 141         return virtual_dma_count + virtual_dma_residue;
 142 }
 143
 144
 145 static int fd_request_irq(void)
 146 {
 147         if(can_use_virtual_dma)
 148                 return request_irq(FLOPPY_IRQ, floppy_hardint,SA_INTERRUPT,
 149                                                    "floppy", NULL);
 150         else
 151                 return request_irq(FLOPPY_IRQ, floppy_interrupt,
 152                                                    SA_INTERRUPT|SA_SAMPLE_RANDOM,
 153                                                    "floppy", NULL);
 154
 155 }
 156
 157 static unsigned long dma_mem_alloc(unsigned long size)
 158 {
 159         return __get_dma_pages(GFP_KERNEL,get_order(size));
 160 }
 161
 162
 163 static unsigned long vdma_mem_alloc(unsigned long size)
 164 {
 165         return (unsigned long) vmalloc(size);
 166
 167 }
 168
 169 #define nodma_mem_alloc(size) vdma_mem_alloc(size)
 170
 171 static void _fd_dma_mem_free(unsigned long addr, unsigned long size)
 172 {
 173         if((unsigned long) addr >= (unsigned long) high_memory)
 174                 return vfree((void *)addr);
 175         else
 176                 free_pages(addr, get_order(size));
 177 }
 178
 179 #define fd_dma_mem_free(addr, size)  _fd_dma_mem_free(addr, size)
 180
 181 static void _fd_chose_dma_mode(char *addr, unsigned long size)
 182 {
 183         if(can_use_virtual_dma == 2) {
 184                 if((unsigned long) addr >= (unsigned long) high_memory ||
 185                    virt_to_bus(addr) >= 0x1000000 ||
 186                    _CROSS_64KB(addr, size, 0))
 187                         use_virtual_dma = 1;
 188                 else
 189                         use_virtual_dma = 0;
 190         } else {
 191                 use_virtual_dma = can_use_virtual_dma & 1;
 192         }
 193 }
 194
 195 #define fd_chose_dma_mode(addr, size) _fd_chose_dma_mode(addr, size)
 196
 197
 198 static int vdma_dma_setup(char *addr, unsigned long size, int mode, int io)
 199 {
 200         doing_pdma = 1;
 201         virtual_dma_port = io;
 202         virtual_dma_mode = (mode  == DMA_MODE_WRITE);
 203         virtual_dma_addr = addr;
 204         virtual_dma_count = size;
 205         virtual_dma_residue = 0;
 206         return 0;
 207 }
 208
 209 static int hard_dma_setup(char *addr, unsigned long size, int mode, int io)
 210 {
 211 #ifdef FLOPPY_SANITY_CHECK
 212         if (CROSS_64KB(addr, size)) {
 213                 printk("DMA crossing 64-K boundary %p-%p\n", addr, addr+size);
 214                 return -1;
 215         }
 216 #endif
 217         /* actual, physical DMA */
 218         doing_pdma = 0;
 219         clear_dma_ff(FLOPPY_DMA);
 220         set_dma_mode(FLOPPY_DMA,mode);
 221         set_dma_addr(FLOPPY_DMA,virt_to_bus(addr));
 222         set_dma_count(FLOPPY_DMA,size);
 223         enable_dma(FLOPPY_DMA);
 224         return 0;
 225 }
 226
 227 struct fd_routine_l {
 228         int (*_request_dma)(unsigned int dmanr, const char * device_id);
 229         void (*_free_dma)(unsigned int dmanr);
 230         int (*_get_dma_residue)(unsigned int dummy);
 231         unsigned long (*_dma_mem_alloc) (unsigned long size);
 232         int (*_dma_setup)(char *addr, unsigned long size, int mode, int io);
 233 } fd_routine[] = {
 234         {
 235                 request_dma,
 236                 free_dma,
 237                 get_dma_residue,
 238                 dma_mem_alloc,
 239                 hard_dma_setup
 240         },
 241         {
 242                 vdma_request_dma,
 243                 vdma_nop,
 244                 vdma_get_dma_residue,
 245                 vdma_mem_alloc,
 246                 vdma_dma_setup
 247         }
 248 };
 249
 250
 251 static int FDC1 = 0x3f0;
 252 static int FDC2 = -1;
 253
 254 /*
 255  * Floppy types are stored in the rtc's CMOS RAM and so rtc_lock
 256  * is needed to prevent corrupted CMOS RAM in case "insmod floppy"
 257  * coincides with another rtc CMOS user.                Paul G.
 258  */
 259 #define FLOPPY0_TYPE    ({                              \
 260         unsigned long flags;                            \
 261         unsigned char val;                              \
 262         spin_lock_irqsave(&rtc_lock, flags);            \
 263         val = (CMOS_READ(0x10) >> 4) & 15;              \
 264         spin_unlock_irqrestore(&rtc_lock, flags);       \
 265         val;                                            \
 266 })
 267
 268 #define FLOPPY1_TYPE    ({                              \
 269         unsigned long flags;                            \
 270         unsigned char val;                              \
 271         spin_lock_irqsave(&rtc_lock, flags);            \
 272         val = CMOS_READ(0x10) & 15;                     \
 273         spin_unlock_irqrestore(&rtc_lock, flags);       \
 274         val;                                            \
 275 })
 276
 277 #define N_FDC 2
 278 #define N_DRIVE 8
 279
 280 #define FLOPPY_MOTOR_MASK 0xf0
 281
 282 #define AUTO_DMA
 283
 284 #define EXTRA_FLOPPY_PARAMS
 285
 286 #endif /* __ASM_X86_64_FLOPPY_H */