Loading...
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 235 236 237 238 239 240 241 242 243 244 245 246 247 248 249 250 251 252 253 254 255 256 257 258 259 260 261 262 263 264 265 266 267 268 269 270 271 272 273 274 275 276 277 278 279 280 281 282 283 284 285 286 287 288 289 290 291 292 293 294 295 296 | /*
* Architecture specific parts of the Floppy driver
*
* This file is subject to the terms and conditions of the GNU General Public
* License. See the file "COPYING" in the main directory of this archive
* for more details.
*
* Copyright (C) 1995
*/
#ifndef __ASM_I386_FLOPPY_H
#define __ASM_I386_FLOPPY_H
#include <linux/vmalloc.h>
#define SW fd_routine[use_virtual_dma&1]
#define fd_inb(port) inb_p(port)
#define fd_outb(port,value) outb_p(port,value)
#define fd_enable_dma() SW._enable_dma(FLOPPY_DMA)
#define fd_disable_dma() SW._disable_dma(FLOPPY_DMA)
#define fd_request_dma() SW._request_dma(FLOPPY_DMA,"floppy")
#define fd_free_dma() SW._free_dma(FLOPPY_DMA)
#define fd_clear_dma_ff() SW._clear_dma_ff(FLOPPY_DMA)
#define fd_set_dma_mode(mode) SW._set_dma_mode(FLOPPY_DMA,mode)
#define fd_set_dma_addr(addr) SW._set_dma_addr(FLOPPY_DMA,addr)
#define fd_set_dma_count(count) SW._set_dma_count(FLOPPY_DMA,count)
#define fd_enable_irq() enable_irq(FLOPPY_IRQ)
#define fd_disable_irq() disable_irq(FLOPPY_IRQ)
#define fd_cacheflush(addr,size) /* nothing */
#define fd_request_irq() SW._request_irq(FLOPPY_IRQ, floppy_interrupt, \
SA_INTERRUPT|SA_SAMPLE_RANDOM, \
"floppy", NULL)
#define fd_free_irq() free_irq(FLOPPY_IRQ, NULL)
#define fd_get_dma_residue() SW._get_dma_residue(FLOPPY_DMA)
#define fd_dma_mem_alloc(size) SW._dma_mem_alloc(size)
#define fd_dma_mem_free(addr,size) SW._dma_mem_free(addr,size)
static int virtual_dma_count=0;
static int virtual_dma_residue=0;
static char *virtual_dma_addr=0;
static int virtual_dma_mode=0;
static int doing_pdma=0;
static void floppy_hardint(int irq, void *dev_id, struct pt_regs * regs)
{
register unsigned char st;
#undef TRACE_FLPY_INT
#undef NO_FLOPPY_ASSEMBLER
#ifdef TRACE_FLPY_INT
static int calls=0;
static int bytes=0;
static int dma_wait=0;
#endif
if(!doing_pdma) {
floppy_interrupt(irq, dev_id, regs);
return;
}
#ifdef TRACE_FLPY_INT
if(!calls)
bytes = virtual_dma_count;
#endif
#ifndef NO_FLOPPY_ASSEMBLER
__asm__ (
"testl %1,%1
je 3f
1: inb %w4,%b0
andb $160,%b0
cmpb $160,%b0
jne 2f
incw %w4
testl %3,%3
jne 4f
inb %w4,%b0
movb %0,(%2)
jmp 5f
4: movb (%2),%0
outb %b0,%w4
5: decw %w4
outb %0,$0x80
decl %1
incl %2
testl %1,%1
jne 1b
3: inb %w4,%b0
2: "
: "=a" ((char) st),
"=c" ((long) virtual_dma_count),
"=S" ((long) virtual_dma_addr)
: "b" ((long) virtual_dma_mode),
"d" ((short) virtual_dma_port+4),
"1" ((long) virtual_dma_count),
"2" ((long) virtual_dma_addr));
#else
{
register int lcount;
register char *lptr;
st = 1;
for(lcount=virtual_dma_count, lptr=virtual_dma_addr;
lcount; lcount--, lptr++) {
st=inb(virtual_dma_port+4) & 0xa0 ;
if(st != 0xa0)
break;
if(virtual_dma_mode)
outb_p(*lptr, virtual_dma_port+5);
else
*lptr = inb_p(virtual_dma_port+5);
st = inb(virtual_dma_port+4);
}
virtual_dma_count = lcount;
virtual_dma_addr = lptr;
}
#endif
#ifdef TRACE_FLPY_INT
calls++;
#endif
if(st == 0x20)
return;
if(!(st & 0x20)) {
virtual_dma_residue += virtual_dma_count;
virtual_dma_count=0;
#ifdef TRACE_FLPY_INT
printk("count=%x, residue=%x calls=%d bytes=%d dma_wait=%d\n",
virtual_dma_count, virtual_dma_residue, calls, bytes,
dma_wait);
calls = 0;
dma_wait=0;
#endif
doing_pdma = 0;
floppy_interrupt(irq, dev_id, regs);
return;
}
#ifdef TRACE_FLPY_INT
if(!virtual_dma_count)
dma_wait++;
#endif
}
static void vdma_enable_dma(unsigned int dummy)
{
doing_pdma = 1;
}
static void vdma_disable_dma(unsigned int dummy)
{
doing_pdma = 0;
virtual_dma_residue += virtual_dma_count;
virtual_dma_count=0;
}
static int vdma_request_dma(unsigned int dmanr, const char * device_id)
{
return 0;
}
static void vdma_nop(unsigned int dummy)
{
}
static void vdma_set_dma_mode(unsigned int dummy,char mode)
{
virtual_dma_mode = (mode == DMA_MODE_WRITE);
}
static void hset_dma_addr(unsigned int no, char *addr)
{
set_dma_addr(no, virt_to_bus(addr));
}
static void vdma_set_dma_addr(unsigned int dummy, char *addr)
{
virtual_dma_addr = addr;
}
static void vdma_set_dma_count(unsigned int dummy,unsigned int count)
{
virtual_dma_count = count;
virtual_dma_residue = 0;
}
static int vdma_get_dma_residue(unsigned int dummy)
{
return virtual_dma_count + virtual_dma_residue;
}
static int vdma_request_irq(unsigned int irq,
void (*handler)(int, void *, struct pt_regs *),
unsigned long flags,
const char *device,
void *dev_id)
{
return request_irq(irq, floppy_hardint,SA_INTERRUPT,device, dev_id);
}
static unsigned long dma_mem_alloc(unsigned long size)
{
return __get_dma_pages(GFP_KERNEL,__get_order(size));
}
static void dma_mem_free(unsigned long addr, unsigned long size)
{
free_pages(addr, __get_order(size));
}
static unsigned long vdma_mem_alloc(unsigned long size)
{
return (unsigned long) vmalloc(size);
}
static void vdma_mem_free(unsigned long addr, unsigned long size)
{
return vfree((void *)addr);
}
struct fd_routine_l {
void (*_enable_dma)(unsigned int dummy);
void (*_disable_dma)(unsigned int dummy);
int (*_request_dma)(unsigned int dmanr, const char * device_id);
void (*_free_dma)(unsigned int dmanr);
void (*_clear_dma_ff)(unsigned int dummy);
void (*_set_dma_mode)(unsigned int dummy, char mode);
void (*_set_dma_addr)(unsigned int dummy, char *addr);
void (*_set_dma_count)(unsigned int dummy, unsigned int count);
int (*_get_dma_residue)(unsigned int dummy);
int (*_request_irq)(unsigned int irq,
void (*handler)(int, void *, struct pt_regs *),
unsigned long flags,
const char *device,
void *dev_id);
unsigned long (*_dma_mem_alloc) (unsigned long size);
void (*_dma_mem_free)(unsigned long addr, unsigned long size);
} fd_routine[] = {
{
enable_dma,
disable_dma,
request_dma,
free_dma,
clear_dma_ff,
set_dma_mode,
hset_dma_addr,
set_dma_count,
get_dma_residue,
request_irq,
dma_mem_alloc,
dma_mem_free
},
{
vdma_enable_dma,
vdma_disable_dma,
vdma_request_dma,
vdma_nop,
vdma_nop,
vdma_set_dma_mode,
vdma_set_dma_addr,
vdma_set_dma_count,
vdma_get_dma_residue,
vdma_request_irq,
vdma_mem_alloc,
vdma_mem_free
}
};
__inline__ void virtual_dma_init(void)
{
/* Nothing to do on an i386 */
}
static int FDC1 = 0x3f0;
static int FDC2 = -1;
#define FLOPPY0_TYPE ((CMOS_READ(0x10) >> 4) & 15)
#define FLOPPY1_TYPE (CMOS_READ(0x10) & 15)
#define N_FDC 2
#define N_DRIVE 8
/*
* The DMA channel used by the floppy controller cannot access data at
* addresses >= 16MB
*
* Went back to the 1MB limit, as some people had problems with the floppy
* driver otherwise. It doesn't matter much for performance anyway, as most
* floppy accesses go through the track buffer.
*/
#define CROSS_64KB(a,s) (((unsigned long)(a)/K_64 != ((unsigned long)(a) + (s) - 1) / K_64) && ! (use_virtual_dma & 1))
#endif /* __ASM_I386_FLOPPY_H */
|