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   1 /*
   2  * Architecture specific parts of the Floppy driver
   3  *   include/asm-i386/floppy.h
   4  *
   5  * This file is subject to the terms and conditions of the GNU General Public
   6  * License.  See the file "COPYING" in the main directory of this archive
   7  * for more details.
   8  *
   9  * Copyright (C) 1995
  10  */
  11 #ifndef __ASM_SH_FLOPPY_H
  12 #define __ASM_SH_FLOPPY_H
  13
  14 #include <linux/vmalloc.h>
  15
  16
  17 /*
  18  * The DMA channel used by the floppy controller cannot access data at
  19  * addresses >= 16MB
  20  *
  21  * Went back to the 1MB limit, as some people had problems with the floppy
  22  * driver otherwise. It doesn't matter much for performance anyway, as most
  23  * floppy accesses go through the track buffer.
  24  */
  25 #define _CROSS_64KB(a,s,vdma) \
  26 (!vdma && ((unsigned long)(a)/K_64 != ((unsigned long)(a) + (s) - 1) / K_64))
  27
  28 #define CROSS_64KB(a,s) _CROSS_64KB(a,s,use_virtual_dma & 1)
  29
  30
  31 #define SW fd_routine[use_virtual_dma&1]
  32 #define CSW fd_routine[can_use_virtual_dma & 1]
  33
  34
  35 #define fd_inb(port)                    inb_p(port)
  36 #define fd_outb(value,port)             outb_p(value,port)
  37
  38 #define fd_request_dma()        CSW._request_dma(FLOPPY_DMA,"floppy")
  39 #define fd_free_dma()           CSW._free_dma(FLOPPY_DMA)
  40 #define fd_enable_irq()         enable_irq(FLOPPY_IRQ)
  41 #define fd_disable_irq()        disable_irq(FLOPPY_IRQ)
  42 #define fd_free_irq()           free_irq(FLOPPY_IRQ, NULL)
  43 #define fd_get_dma_residue()    SW._get_dma_residue(FLOPPY_DMA)
  44 #define fd_dma_mem_alloc(size)  SW._dma_mem_alloc(size)
  45 #define fd_dma_setup(addr, size, mode, io) SW._dma_setup(addr, size, mode, io)
  46
  47 #define FLOPPY_CAN_FALLBACK_ON_NODMA
  48
  49 static int virtual_dma_count;
  50 static int virtual_dma_residue;
  51 static char *virtual_dma_addr;
  52 static int virtual_dma_mode;
  53 static int doing_pdma;
  54
  55 static void floppy_hardint(int irq, void *dev_id, struct pt_regs * regs)
  56 {
  57         register unsigned char st;
  58
  59 #undef TRACE_FLPY_INT
  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                 floppy_interrupt(irq, dev_id, regs);
  68                 return;
  69         }
  70
  71 #ifdef TRACE_FLPY_INT
  72         if(!calls)
  73                 bytes = virtual_dma_count;
  74 #endif
  75
  76         {
  77                 register int lcount;
  78                 register char *lptr;
  79
  80                 st = 1;
  81                 for(lcount=virtual_dma_count, lptr=virtual_dma_addr;
  82                     lcount; lcount--, lptr++) {
  83                         st=inb(virtual_dma_port+4) & 0xa0 ;
  84                         if(st != 0xa0)
  85                                 break;
  86                         if(virtual_dma_mode)
  87                                 outb_p(*lptr, virtual_dma_port+5);
  88                         else
  89                                 *lptr = inb_p(virtual_dma_port+5);
  90                 }
  91                 virtual_dma_count = lcount;
  92                 virtual_dma_addr = lptr;
  93                 st = inb(virtual_dma_port+4);
  94         }
  95
  96 #ifdef TRACE_FLPY_INT
  97         calls++;
  98 #endif
  99         if(st == 0x20)
 100                 return;
 101         if(!(st & 0x20)) {
 102                 virtual_dma_residue += virtual_dma_count;
 103                 virtual_dma_count=0;
 104 #ifdef TRACE_FLPY_INT
 105                 printk("count=%x, residue=%x calls=%d bytes=%d dma_wait=%d\n",
 106                        virtual_dma_count, virtual_dma_residue, calls, bytes,
 107                        dma_wait);
 108                 calls = 0;
 109                 dma_wait=0;
 110 #endif
 111                 doing_pdma = 0;
 112                 floppy_interrupt(irq, dev_id, regs);
 113                 return;
 114         }
 115 #ifdef TRACE_FLPY_INT
 116         if(!virtual_dma_count)
 117                 dma_wait++;
 118 #endif
 119 }
 120
 121 static void fd_disable_dma(void)
 122 {
 123         if(! (can_use_virtual_dma & 1))
 124                 disable_dma(FLOPPY_DMA);
 125         doing_pdma = 0;
 126         virtual_dma_residue += virtual_dma_count;
 127         virtual_dma_count=0;
 128 }
 129
 130 static int vdma_request_dma(unsigned int dmanr, const char * device_id)
 131 {
 132         return 0;
 133 }
 134
 135 static void vdma_nop(unsigned int dummy)
 136 {
 137 }
 138
 139
 140 static int vdma_get_dma_residue(unsigned int dummy)
 141 {
 142         return virtual_dma_count + virtual_dma_residue;
 143 }
 144
 145
 146 static int fd_request_irq(void)
 147 {
 148         if(can_use_virtual_dma)
 149                 return request_irq(FLOPPY_IRQ, floppy_hardint,
 150                                    IRQF_DISABLED, "floppy", NULL);
 151         else
 152                 return request_irq(FLOPPY_IRQ, floppy_interrupt,
 153                                    IRQF_DISABLED, "floppy", NULL);
 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                 return 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                    virt_to_phys(addr) >= 0x10000000)
 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
 216         __flush_purge_region(addr, size);
 217
 218         /* actual, physical DMA */
 219         doing_pdma = 0;
 220         clear_dma_ff(FLOPPY_DMA);
 221         set_dma_mode(FLOPPY_DMA,mode);
 222         set_dma_addr(FLOPPY_DMA,virt_to_phys(addr));
 223         set_dma_count(FLOPPY_DMA,size);
 224         enable_dma(FLOPPY_DMA);
 225         return 0;
 226 }
 227
 228 static struct fd_routine_l {
 229         int (*_request_dma)(unsigned int dmanr, const char * device_id);
 230         void (*_free_dma)(unsigned int dmanr);
 231         int (*_get_dma_residue)(unsigned int dummy);
 232         unsigned long (*_dma_mem_alloc) (unsigned long size);
 233         int (*_dma_setup)(char *addr, unsigned long size, int mode, int io);
 234 } fd_routine[] = {
 235         {
 236                 request_dma,
 237                 free_dma,
 238                 get_dma_residue,
 239                 dma_mem_alloc,
 240                 hard_dma_setup
 241         },
 242         {
 243                 vdma_request_dma,
 244                 vdma_nop,
 245                 vdma_get_dma_residue,
 246                 vdma_mem_alloc,
 247                 vdma_dma_setup
 248         }
 249 };
 250
 251
 252 static int FDC1 = 0x3f0;
 253 static int FDC2 = -1;
 254
 255 /*
 256  * Floppy types are stored in the rtc's CMOS RAM and so rtc_lock
 257  * is needed to prevent corrupted CMOS RAM in case "insmod floppy"
 258  * coincides with another rtc CMOS user.                Paul G.
 259  */
 260 #define FLOPPY0_TYPE    (4)
 261 #define FLOPPY1_TYPE    (0)
 262
 263 #define N_FDC 2
 264 #define N_DRIVE 8
 265
 266 #define EXTRA_FLOPPY_PARAMS
 267
 268 #endif /* __ASM_SH_FLOPPY_H */