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   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)
  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);
  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);
 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,
 148                                    IRQF_DISABLED, "floppy", NULL);
 149         else
 150                 return request_irq(FLOPPY_IRQ, floppy_interrupt,
 151                                    IRQF_DISABLED, "floppy", NULL);
 152
 153 }
 154
 155 static unsigned long dma_mem_alloc(unsigned long size)
 156 {
 157         return __get_dma_pages(GFP_KERNEL,get_order(size));
 158 }
 159
 160
 161 static unsigned long vdma_mem_alloc(unsigned long size)
 162 {
 163         return (unsigned long) vmalloc(size);
 164
 165 }
 166
 167 #define nodma_mem_alloc(size) vdma_mem_alloc(size)
 168
 169 static void _fd_dma_mem_free(unsigned long addr, unsigned long size)
 170 {
 171         if((unsigned int) addr >= (unsigned int) high_memory)
 172                 vfree((void *)addr);
 173         else
 174                 free_pages(addr, get_order(size));
 175 }
 176
 177 #define fd_dma_mem_free(addr, size)  _fd_dma_mem_free(addr, size)
 178
 179 static void _fd_chose_dma_mode(char *addr, unsigned long size)
 180 {
 181         if(can_use_virtual_dma == 2) {
 182                 if((unsigned int) addr >= (unsigned int) high_memory ||
 183                    isa_virt_to_bus(addr) >= 0x1000000 ||
 184                    _CROSS_64KB(addr, size, 0))
 185                         use_virtual_dma = 1;
 186                 else
 187                         use_virtual_dma = 0;
 188         } else {
 189                 use_virtual_dma = can_use_virtual_dma & 1;
 190         }
 191 }
 192
 193 #define fd_chose_dma_mode(addr, size) _fd_chose_dma_mode(addr, size)
 194
 195
 196 static int vdma_dma_setup(char *addr, unsigned long size, int mode, int io)
 197 {
 198         doing_pdma = 1;
 199         virtual_dma_port = io;
 200         virtual_dma_mode = (mode  == DMA_MODE_WRITE);
 201         virtual_dma_addr = addr;
 202         virtual_dma_count = size;
 203         virtual_dma_residue = 0;
 204         return 0;
 205 }
 206
 207 static int hard_dma_setup(char *addr, unsigned long size, int mode, int io)
 208 {
 209 #ifdef FLOPPY_SANITY_CHECK
 210         if (CROSS_64KB(addr, size)) {
 211                 printk("DMA crossing 64-K boundary %p-%p\n", addr, addr+size);
 212                 return -1;
 213         }
 214 #endif
 215         /* actual, physical DMA */
 216         doing_pdma = 0;
 217         clear_dma_ff(FLOPPY_DMA);
 218         set_dma_mode(FLOPPY_DMA,mode);
 219         set_dma_addr(FLOPPY_DMA,isa_virt_to_bus(addr));
 220         set_dma_count(FLOPPY_DMA,size);
 221         enable_dma(FLOPPY_DMA);
 222         return 0;
 223 }
 224
 225 static struct fd_routine_l {
 226         int (*_request_dma)(unsigned int dmanr, const char * device_id);
 227         void (*_free_dma)(unsigned int dmanr);
 228         int (*_get_dma_residue)(unsigned int dummy);
 229         unsigned long (*_dma_mem_alloc) (unsigned long size);
 230         int (*_dma_setup)(char *addr, unsigned long size, int mode, int io);
 231 } fd_routine[] = {
 232         {
 233                 request_dma,
 234                 free_dma,
 235                 get_dma_residue,
 236                 dma_mem_alloc,
 237                 hard_dma_setup
 238         },
 239         {
 240                 vdma_request_dma,
 241                 vdma_nop,
 242                 vdma_get_dma_residue,
 243                 vdma_mem_alloc,
 244                 vdma_dma_setup
 245         }
 246 };
 247
 248
 249 static int FDC1 = 0x3f0;
 250 static int FDC2 = -1;
 251
 252 /*
 253  * Floppy types are stored in the rtc's CMOS RAM and so rtc_lock
 254  * is needed to prevent corrupted CMOS RAM in case "insmod floppy"
 255  * coincides with another rtc CMOS user.                Paul G.
 256  */
 257 #define FLOPPY0_TYPE    ({                              \
 258         unsigned long flags;                            \
 259         unsigned char val;                              \
 260         spin_lock_irqsave(&rtc_lock, flags);            \
 261         val = (CMOS_READ(0x10) >> 4) & 15;              \
 262         spin_unlock_irqrestore(&rtc_lock, flags);       \
 263         val;                                            \
 264 })
 265
 266 #define FLOPPY1_TYPE    ({                              \
 267         unsigned long flags;                            \
 268         unsigned char val;                              \
 269         spin_lock_irqsave(&rtc_lock, flags);            \
 270         val = CMOS_READ(0x10) & 15;                     \
 271         spin_unlock_irqrestore(&rtc_lock, flags);       \
 272         val;                                            \
 273 })
 274
 275 #define N_FDC 2
 276 #define N_DRIVE 8
 277
 278 #define EXTRA_FLOPPY_PARAMS
 279
 280 #endif /* __ASM_I386_FLOPPY_H */