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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(value,port)             outb_p(value,port)
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                 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 static 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 */