arch/x86/include/asm/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_FLOPPY_H
  11 #define _ASM_X86_FLOPPY_H
  12
  13 #include <linux/vmalloc.h>
  14
  15 /*
  16  * The DMA channel used by the floppy controller cannot access data at
  17  * addresses >= 16MB
  18  *
  19  * Went back to the 1MB limit, as some people had problems with the floppy
  20  * driver otherwise. It doesn't matter much for performance anyway, as most
  21  * floppy accesses go through the track buffer.
  22  */
  23 #define _CROSS_64KB(a, s, vdma)                                         \
  24         (!(vdma) &&                                                     \
  25          ((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(base, reg)               inb_p((base) + (reg))
  35 #define fd_outb(value, base, reg)       outb_p(value, (base) + (reg))
  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         unsigned char st;
  57
  58 #undef TRACE_FLPY_INT
  59
  60 #ifdef TRACE_FLPY_INT
  61         static int calls;
  62         static int bytes;
  63         static int dma_wait;
  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                 int lcount;
  75                 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 + FD_STATUS);
  81                         st &= STATUS_DMA | STATUS_READY;
  82                         if (st != (STATUS_DMA | STATUS_READY))
  83                                 break;
  84                         if (virtual_dma_mode)
  85                                 outb_p(*lptr, virtual_dma_port + FD_DATA);
  86                         else
  87                                 *lptr = inb_p(virtual_dma_port + FD_DATA);
  88                 }
  89                 virtual_dma_count = lcount;
  90                 virtual_dma_addr = lptr;
  91                 st = inb(virtual_dma_port + FD_STATUS);
  92         }
  93
  94 #ifdef TRACE_FLPY_INT
  95         calls++;
  96 #endif
  97         if (st == STATUS_DMA)
  98                 return IRQ_HANDLED;
  99         if (!(st & STATUS_DMA)) {
 100                 virtual_dma_residue += virtual_dma_count;
 101                 virtual_dma_count = 0;
 102 #ifdef TRACE_FLPY_INT
 103                 printk(KERN_DEBUG "count=%x, residue=%x calls=%d bytes=%d dma_wait=%d\n",
 104                        virtual_dma_count, virtual_dma_residue, calls, bytes,
 105                        dma_wait);
 106                 calls = 0;
 107                 dma_wait = 0;
 108 #endif
 109                 doing_pdma = 0;
 110                 floppy_interrupt(irq, dev_id);
 111                 return IRQ_HANDLED;
 112         }
 113 #ifdef TRACE_FLPY_INT
 114         if (!virtual_dma_count)
 115                 dma_wait++;
 116 #endif
 117         return IRQ_HANDLED;
 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,
 149                                    0, "floppy", NULL);
 150         else
 151                 return request_irq(FLOPPY_IRQ, floppy_interrupt,
 152                                    0, "floppy", NULL);
 153 }
 154
 155 static unsigned long dma_mem_alloc(unsigned long size)
 156 {
 157         return __get_dma_pages(GFP_KERNEL|__GFP_NORETRY, 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 long)addr >= (unsigned long)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 long)addr >= (unsigned long)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           = request_dma,
 234                 ._free_dma              = free_dma,
 235                 ._get_dma_residue       = get_dma_residue,
 236                 ._dma_mem_alloc         = dma_mem_alloc,
 237                 ._dma_setup             = hard_dma_setup
 238         },
 239         {
 240                 ._request_dma           = vdma_request_dma,
 241                 ._free_dma              = vdma_nop,
 242                 ._get_dma_residue       = vdma_get_dma_residue,
 243                 ._dma_mem_alloc         = vdma_mem_alloc,
 244                 ._dma_setup             = 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 ({                                                      \
 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 ({                                                      \
 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 EXTRA_FLOPPY_PARAMS
 281
 282 #endif /* _ASM_X86_FLOPPY_H */