arch/parisc/include/asm/floppy.h

   1 /*    Architecture specific parts of the Floppy driver
   2  *
   3  *    Linux/PA-RISC Project (http://www.parisc-linux.org/)
   4  *    Copyright (C) 2000 Matthew Wilcox (willy a debian . org)
   5  *    Copyright (C) 2000 Dave Kennedy
   6  *
   7  *    This program is free software; you can redistribute it and/or modify
   8  *    it under the terms of the GNU General Public License as published by
   9  *    the Free Software Foundation; either version 2 of the License, or
  10  *    (at your option) any later version.
  11  *
  12  *    This program is distributed in the hope that it will be useful,
  13  *    but WITHOUT ANY WARRANTY; without even the implied warranty of
  14  *    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  15  *    GNU General Public License for more details.
  16  *
  17  *    You should have received a copy of the GNU General Public License
  18  *    along with this program; if not, write to the Free Software
  19  *    Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
  20  */
  21 #ifndef __ASM_PARISC_FLOPPY_H
  22 #define __ASM_PARISC_FLOPPY_H
  23
  24 #include <linux/vmalloc.h>
  25
  26
  27 /*
  28  * The DMA channel used by the floppy controller cannot access data at
  29  * addresses >= 16MB
  30  *
  31  * Went back to the 1MB limit, as some people had problems with the floppy
  32  * driver otherwise. It doesn't matter much for performance anyway, as most
  33  * floppy accesses go through the track buffer.
  34  */
  35 #define _CROSS_64KB(a,s,vdma) \
  36 (!vdma && ((unsigned long)(a)/K_64 != ((unsigned long)(a) + (s) - 1) / K_64))
  37
  38 #define CROSS_64KB(a,s) _CROSS_64KB(a,s,use_virtual_dma & 1)
  39
  40
  41 #define SW fd_routine[use_virtual_dma&1]
  42 #define CSW fd_routine[can_use_virtual_dma & 1]
  43
  44
  45 #define fd_inb(port)                    readb(port)
  46 #define fd_outb(value, port)            writeb(value, port)
  47
  48 #define fd_request_dma()        CSW._request_dma(FLOPPY_DMA,"floppy")
  49 #define fd_free_dma()           CSW._free_dma(FLOPPY_DMA)
  50 #define fd_enable_irq()         enable_irq(FLOPPY_IRQ)
  51 #define fd_disable_irq()        disable_irq(FLOPPY_IRQ)
  52 #define fd_free_irq()           free_irq(FLOPPY_IRQ, NULL)
  53 #define fd_get_dma_residue()    SW._get_dma_residue(FLOPPY_DMA)
  54 #define fd_dma_mem_alloc(size)  SW._dma_mem_alloc(size)
  55 #define fd_dma_setup(addr, size, mode, io) SW._dma_setup(addr, size, mode, io)
  56
  57 #define FLOPPY_CAN_FALLBACK_ON_NODMA
  58
  59 static int virtual_dma_count=0;
  60 static int virtual_dma_residue=0;
  61 static char *virtual_dma_addr=0;
  62 static int virtual_dma_mode=0;
  63 static int doing_pdma=0;
  64
  65 static void floppy_hardint(int irq, void *dev_id, struct pt_regs * regs)
  66 {
  67         register unsigned char st;
  68
  69 #undef TRACE_FLPY_INT
  70
  71 #ifdef TRACE_FLPY_INT
  72         static int calls=0;
  73         static int bytes=0;
  74         static int dma_wait=0;
  75 #endif
  76         if (!doing_pdma) {
  77                 floppy_interrupt(irq, dev_id, regs);
  78                 return;
  79         }
  80
  81 #ifdef TRACE_FLPY_INT
  82         if(!calls)
  83                 bytes = virtual_dma_count;
  84 #endif
  85
  86         {
  87                 register int lcount;
  88                 register char *lptr = virtual_dma_addr;
  89
  90                 for (lcount = virtual_dma_count; lcount; lcount--) {
  91                         st = fd_inb(virtual_dma_port+4) & 0xa0 ;
  92                         if (st != 0xa0)
  93                                 break;
  94                         if (virtual_dma_mode) {
  95                                 fd_outb(*lptr, virtual_dma_port+5);
  96                         } else {
  97                                 *lptr = fd_inb(virtual_dma_port+5);
  98                         }
  99                         lptr++;
 100                 }
 101                 virtual_dma_count = lcount;
 102                 virtual_dma_addr = lptr;
 103                 st = fd_inb(virtual_dma_port+4);
 104         }
 105
 106 #ifdef TRACE_FLPY_INT
 107         calls++;
 108 #endif
 109         if (st == 0x20)
 110                 return;
 111         if (!(st & 0x20)) {
 112                 virtual_dma_residue += virtual_dma_count;
 113                 virtual_dma_count = 0;
 114 #ifdef TRACE_FLPY_INT
 115                 printk("count=%x, residue=%x calls=%d bytes=%d dma_wait=%d\n",
 116                        virtual_dma_count, virtual_dma_residue, calls, bytes,
 117                        dma_wait);
 118                 calls = 0;
 119                 dma_wait=0;
 120 #endif
 121                 doing_pdma = 0;
 122                 floppy_interrupt(irq, dev_id, regs);
 123                 return;
 124         }
 125 #ifdef TRACE_FLPY_INT
 126         if (!virtual_dma_count)
 127                 dma_wait++;
 128 #endif
 129 }
 130
 131 static void fd_disable_dma(void)
 132 {
 133         if(! (can_use_virtual_dma & 1))
 134                 disable_dma(FLOPPY_DMA);
 135         doing_pdma = 0;
 136         virtual_dma_residue += virtual_dma_count;
 137         virtual_dma_count=0;
 138 }
 139
 140 static int vdma_request_dma(unsigned int dmanr, const char * device_id)
 141 {
 142         return 0;
 143 }
 144
 145 static void vdma_nop(unsigned int dummy)
 146 {
 147 }
 148
 149
 150 static int vdma_get_dma_residue(unsigned int dummy)
 151 {
 152         return virtual_dma_count + virtual_dma_residue;
 153 }
 154
 155
 156 static int fd_request_irq(void)
 157 {
 158         if(can_use_virtual_dma)
 159                 return request_irq(FLOPPY_IRQ, floppy_hardint,
 160                                    0, "floppy", NULL);
 161         else
 162                 return request_irq(FLOPPY_IRQ, floppy_interrupt,
 163                                    0, "floppy", NULL);
 164 }
 165
 166 static unsigned long dma_mem_alloc(unsigned long size)
 167 {
 168         return __get_dma_pages(GFP_KERNEL, get_order(size));
 169 }
 170
 171
 172 static unsigned long vdma_mem_alloc(unsigned long size)
 173 {
 174         return (unsigned long) vmalloc(size);
 175
 176 }
 177
 178 #define nodma_mem_alloc(size) vdma_mem_alloc(size)
 179
 180 static void _fd_dma_mem_free(unsigned long addr, unsigned long size)
 181 {
 182         if((unsigned int) addr >= (unsigned int) high_memory)
 183                 return vfree((void *)addr);
 184         else
 185                 free_pages(addr, get_order(size));
 186 }
 187
 188 #define fd_dma_mem_free(addr, size)  _fd_dma_mem_free(addr, size)
 189
 190 static void _fd_chose_dma_mode(char *addr, unsigned long size)
 191 {
 192         if(can_use_virtual_dma == 2) {
 193                 if((unsigned int) addr >= (unsigned int) high_memory ||
 194                    virt_to_bus(addr) >= 0x1000000 ||
 195                    _CROSS_64KB(addr, size, 0))
 196                         use_virtual_dma = 1;
 197                 else
 198                         use_virtual_dma = 0;
 199         } else {
 200                 use_virtual_dma = can_use_virtual_dma & 1;
 201         }
 202 }
 203
 204 #define fd_chose_dma_mode(addr, size) _fd_chose_dma_mode(addr, size)
 205
 206
 207 static int vdma_dma_setup(char *addr, unsigned long size, int mode, int io)
 208 {
 209         doing_pdma = 1;
 210         virtual_dma_port = io;
 211         virtual_dma_mode = (mode  == DMA_MODE_WRITE);
 212         virtual_dma_addr = addr;
 213         virtual_dma_count = size;
 214         virtual_dma_residue = 0;
 215         return 0;
 216 }
 217
 218 static int hard_dma_setup(char *addr, unsigned long size, int mode, int io)
 219 {
 220 #ifdef FLOPPY_SANITY_CHECK
 221         if (CROSS_64KB(addr, size)) {
 222                 printk("DMA crossing 64-K boundary %p-%p\n", addr, addr+size);
 223                 return -1;
 224         }
 225 #endif
 226         /* actual, physical DMA */
 227         doing_pdma = 0;
 228         clear_dma_ff(FLOPPY_DMA);
 229         set_dma_mode(FLOPPY_DMA,mode);
 230         set_dma_addr(FLOPPY_DMA,virt_to_bus(addr));
 231         set_dma_count(FLOPPY_DMA,size);
 232         enable_dma(FLOPPY_DMA);
 233         return 0;
 234 }
 235
 236 static struct fd_routine_l {
 237         int (*_request_dma)(unsigned int dmanr, const char * device_id);
 238         void (*_free_dma)(unsigned int dmanr);
 239         int (*_get_dma_residue)(unsigned int dummy);
 240         unsigned long (*_dma_mem_alloc) (unsigned long size);
 241         int (*_dma_setup)(char *addr, unsigned long size, int mode, int io);
 242 } fd_routine[] = {
 243         {
 244                 request_dma,
 245                 free_dma,
 246                 get_dma_residue,
 247                 dma_mem_alloc,
 248                 hard_dma_setup
 249         },
 250         {
 251                 vdma_request_dma,
 252                 vdma_nop,
 253                 vdma_get_dma_residue,
 254                 vdma_mem_alloc,
 255                 vdma_dma_setup
 256         }
 257 };
 258
 259
 260 static int FDC1 = 0x3f0; /* Lies.  Floppy controller is memory mapped, not io mapped */
 261 static int FDC2 = -1;
 262
 263 #define FLOPPY0_TYPE    0
 264 #define FLOPPY1_TYPE    0
 265
 266 #define N_FDC 1
 267 #define N_DRIVE 8
 268
 269 #define EXTRA_FLOPPY_PARAMS
 270
 271 #endif /* __ASM_PARISC_FLOPPY_H */