Subversion Repositories shark

Rev

Rev 422 | Details | Compare with Previous | Last modification | View Log | RSS feed

Rev Author Line No. Line
422 giacomo 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(port,value)             outb_p(port,value)
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, struct pt_regs * regs)
55
{
56
        register unsigned char st;
57
 
58
#undef TRACE_FLPY_INT
59
#define NO_FLOPPY_ASSEMBLER
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
                return floppy_interrupt(irq, dev_id, regs);
68
 
69
#ifdef TRACE_FLPY_INT
70
        if(!calls)
71
                bytes = virtual_dma_count;
72
#endif
73
 
74
#ifndef NO_FLOPPY_ASSEMBLER
75
        __asm__ (
76
       "testl %1,%1"
77
        "je 3f"
78
"1:     inb %w4,%b0"
79
        "andb $160,%b0"
80
        "cmpb $160,%b0"
81
        "jne 2f"
82
        "incw %w4"
83
        "testl %3,%3"
84
        "jne 4f"
85
        "inb %w4,%b0"
86
        "movb %0,(%2)"
87
        "jmp 5f"
88
"4:     movb (%2),%0"
89
        "outb %b0,%w4"
90
"5:     decw %w4"
91
        "outb %0,$0x80"
92
        "decl %1"
93
        "incl %2"
94
        "testl %1,%1"
95
        "jne 1b"
96
"3:     inb %w4,%b0"
97
"2:     "
98
       : "=a" ((char) st),
99
       "=c" ((long) virtual_dma_count),
100
       "=S" ((long) virtual_dma_addr)
101
       : "b" ((long) virtual_dma_mode),
102
       "d" ((short) virtual_dma_port+4),
103
       "1" ((long) virtual_dma_count),
104
       "2" ((long) virtual_dma_addr));
105
#else   
106
        {
107
                register int lcount;
108
                register char *lptr;
109
 
110
                st = 1;
111
                for(lcount=virtual_dma_count, lptr=virtual_dma_addr;
112
                    lcount; lcount--, lptr++) {
113
                        st=inb(virtual_dma_port+4) & 0xa0 ;
114
                        if(st != 0xa0)
115
                                break;
116
                        if(virtual_dma_mode)
117
                                outb_p(*lptr, virtual_dma_port+5);
118
                        else
119
                                *lptr = inb_p(virtual_dma_port+5);
120
                }
121
                virtual_dma_count = lcount;
122
                virtual_dma_addr = lptr;
123
                st = inb(virtual_dma_port+4);
124
        }
125
#endif
126
 
127
#ifdef TRACE_FLPY_INT
128
        calls++;
129
#endif
130
        if(st == 0x20)
131
                return IRQ_HANDLED;
132
        if(!(st & 0x20)) {
133
                virtual_dma_residue += virtual_dma_count;
134
                virtual_dma_count=0;
135
#ifdef TRACE_FLPY_INT
136
                printk("count=%x, residue=%x calls=%d bytes=%d dma_wait=%d\n",
137
                       virtual_dma_count, virtual_dma_residue, calls, bytes,
138
                       dma_wait);
139
                calls = 0;
140
                dma_wait=0;
141
#endif
142
                doing_pdma = 0;
143
                floppy_interrupt(irq, dev_id, regs);
144
                return IRQ_HANDLED;
145
        }
146
#ifdef TRACE_FLPY_INT
147
        if(!virtual_dma_count)
148
                dma_wait++;
149
#endif
150
        return IRQ_HANDLED;
151
}
152
 
153
static void fd_disable_dma(void)
154
{
155
        if(! (can_use_virtual_dma & 1))
156
                disable_dma(FLOPPY_DMA);
157
        doing_pdma = 0;
158
        virtual_dma_residue += virtual_dma_count;
159
        virtual_dma_count=0;
160
}
161
 
162
static int vdma_request_dma(unsigned int dmanr, const char * device_id)
163
{
164
        return 0;
165
}
166
 
167
static void vdma_nop(unsigned int dummy)
168
{
169
}
170
 
171
 
172
static int vdma_get_dma_residue(unsigned int dummy)
173
{
174
        return virtual_dma_count + virtual_dma_residue;
175
}
176
 
177
 
178
static int fd_request_irq(void)
179
{
180
        if(can_use_virtual_dma)
181
                return request_irq(FLOPPY_IRQ, floppy_hardint,SA_INTERRUPT,
182
                                                   "floppy", NULL);
183
        else
184
                return request_irq(FLOPPY_IRQ, floppy_interrupt,
185
                                                   SA_INTERRUPT|SA_SAMPLE_RANDOM,
186
                                                   "floppy", NULL);    
187
 
188
}
189
 
190
static unsigned long dma_mem_alloc(unsigned long size)
191
{
192
        return __get_dma_pages(GFP_KERNEL,get_order(size));
193
}
194
 
195
 
196
static unsigned long vdma_mem_alloc(unsigned long size)
197
{
198
        return (unsigned long) vmalloc(size);
199
 
200
}
201
 
202
#define nodma_mem_alloc(size) vdma_mem_alloc(size)
203
 
204
static void _fd_dma_mem_free(unsigned long addr, unsigned long size)
205
{
206
        if((unsigned int) addr >= (unsigned int) high_memory)
207
                return vfree((void *)addr);
208
        else
209
                free_pages(addr, get_order(size));             
210
}
211
 
212
#define fd_dma_mem_free(addr, size)  _fd_dma_mem_free(addr, size) 
213
 
214
static void _fd_chose_dma_mode(char *addr, unsigned long size)
215
{
216
        if(can_use_virtual_dma == 2) {
217
                if((unsigned int) addr >= (unsigned int) high_memory ||
218
                   isa_virt_to_bus(addr) >= 0x1000000 ||
219
                   _CROSS_64KB(addr, size, 0))
220
                        use_virtual_dma = 1;
221
                else
222
                        use_virtual_dma = 0;
223
        } else {
224
                use_virtual_dma = can_use_virtual_dma & 1;
225
        }
226
}
227
 
228
#define fd_chose_dma_mode(addr, size) _fd_chose_dma_mode(addr, size)
229
 
230
 
231
static int vdma_dma_setup(char *addr, unsigned long size, int mode, int io)
232
{
233
        doing_pdma = 1;
234
        virtual_dma_port = io;
235
        virtual_dma_mode = (mode  == DMA_MODE_WRITE);
236
        virtual_dma_addr = addr;
237
        virtual_dma_count = size;
238
        virtual_dma_residue = 0;
239
        return 0;
240
}
241
 
242
static int hard_dma_setup(char *addr, unsigned long size, int mode, int io)
243
{
244
#ifdef FLOPPY_SANITY_CHECK
245
        if (CROSS_64KB(addr, size)) {
246
                printk("DMA crossing 64-K boundary %p-%p\n", addr, addr+size);
247
                return -1;
248
        }
249
#endif
250
        /* actual, physical DMA */
251
        doing_pdma = 0;
252
        clear_dma_ff(FLOPPY_DMA);
253
        set_dma_mode(FLOPPY_DMA,mode);
254
        set_dma_addr(FLOPPY_DMA,isa_virt_to_bus(addr));
255
        set_dma_count(FLOPPY_DMA,size);
256
        enable_dma(FLOPPY_DMA);
257
        return 0;
258
}
259
 
260
struct fd_routine_l {
261
        int (*_request_dma)(unsigned int dmanr, const char * device_id);
262
        void (*_free_dma)(unsigned int dmanr);
263
        int (*_get_dma_residue)(unsigned int dummy);
264
        unsigned long (*_dma_mem_alloc) (unsigned long size);
265
        int (*_dma_setup)(char *addr, unsigned long size, int mode, int io);
266
} fd_routine[] = {
267
        {
268
                request_dma,
269
                free_dma,
270
                get_dma_residue,
271
                dma_mem_alloc,
272
                hard_dma_setup
273
        },
274
        {
275
                vdma_request_dma,
276
                vdma_nop,
277
                vdma_get_dma_residue,
278
                vdma_mem_alloc,
279
                vdma_dma_setup
280
        }
281
};
282
 
283
 
284
static int FDC1 = 0x3f0;
285
static int FDC2 = -1;
286
 
287
/*
288
 * Floppy types are stored in the rtc's CMOS RAM and so rtc_lock
289
 * is needed to prevent corrupted CMOS RAM in case "insmod floppy"
290
 * coincides with another rtc CMOS user.                Paul G.
291
 */
292
#define FLOPPY0_TYPE    ({                              \
293
        unsigned long flags;                            \
294
        unsigned char val;                              \
295
        spin_lock_irqsave(&rtc_lock, flags);            \
296
        val = (CMOS_READ(0x10) >> 4) & 15;              \
297
        spin_unlock_irqrestore(&rtc_lock, flags);       \
298
        val;                                            \
299
})
300
 
301
#define FLOPPY1_TYPE    ({                              \
302
        unsigned long flags;                            \
303
        unsigned char val;                              \
304
        spin_lock_irqsave(&rtc_lock, flags);            \
305
        val = CMOS_READ(0x10) & 15;                     \
306
        spin_unlock_irqrestore(&rtc_lock, flags);       \
307
        val;                                            \
308
})
309
 
310
#define N_FDC 2
311
#define N_DRIVE 8
312
 
313
#define FLOPPY_MOTOR_MASK 0xf0
314
 
315
#define AUTO_DMA
316
 
317
#define EXTRA_FLOPPY_PARAMS
318
 
319
#endif /* __ASM_I386_FLOPPY_H */