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floppy.h
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1 /*
2  * Implementation independent bits of the Floppy driver.
3  *
4  * much of this file is derived from what was originally the Q40 floppy driver.
5  *
6  * This file is subject to the terms and conditions of the GNU General Public
7  * License. See the file "COPYING" in the main directory of this archive
8  * for more details.
9  *
10  * Copyright (C) 1999, 2000, 2001
11  *
12  * Sun3x support added 2/4/2000 Sam Creasey ([email protected])
13  *
14  */
15 
16 #include <asm/io.h>
17 
18 #include <linux/vmalloc.h>
19 
21 
22 /* constants... */
23 
24 #undef MAX_DMA_ADDRESS
25 #define MAX_DMA_ADDRESS 0x00 /* nothing like that */
26 
27 
28 /*
29  * Again, the CMOS information doesn't work on m68k..
30  */
31 #define FLOPPY0_TYPE (MACH_IS_Q40 ? 6 : 4)
32 #define FLOPPY1_TYPE 0
33 
34 /* basically PC init + set use_virtual_dma */
35 #define FDC1 m68k_floppy_init()
36 
37 #define N_FDC 1
38 #define N_DRIVE 8
39 
40 
41 /* vdma globals adapted from asm-i386/floppy.h */
42 
43 static int virtual_dma_count=0;
44 static int virtual_dma_residue=0;
45 static char *virtual_dma_addr=NULL;
46 static int virtual_dma_mode=0;
47 static int doing_pdma=0;
48 
49 #include <asm/sun3xflop.h>
50 
52 
53 static __inline__ unsigned long claim_dma_lock(void)
54 {
55  unsigned long flags;
56  spin_lock_irqsave(&dma_spin_lock, flags);
57  return flags;
58 }
59 
60 static __inline__ void release_dma_lock(unsigned long flags)
61 {
62  spin_unlock_irqrestore(&dma_spin_lock, flags);
63 }
64 
65 
66 static __inline__ unsigned char fd_inb(int port)
67 {
68  if(MACH_IS_Q40)
69  return inb_p(port);
70  else if(MACH_IS_SUN3X)
71  return sun3x_82072_fd_inb(port);
72  return 0;
73 }
74 
75 static __inline__ void fd_outb(unsigned char value, int port)
76 {
77  if(MACH_IS_Q40)
78  outb_p(value, port);
79  else if(MACH_IS_SUN3X)
80  sun3x_82072_fd_outb(value, port);
81 }
82 
83 
84 static int fd_request_irq(void)
85 {
86  if(MACH_IS_Q40)
87  return request_irq(FLOPPY_IRQ, floppy_hardint,
88  IRQF_DISABLED, "floppy", floppy_hardint);
89  else if(MACH_IS_SUN3X)
90  return sun3xflop_request_irq();
91  return -ENXIO;
92 }
93 
94 static void fd_free_irq(void)
95 {
96  if(MACH_IS_Q40)
97  free_irq(FLOPPY_IRQ, floppy_hardint);
98 }
99 
100 #define fd_request_dma() vdma_request_dma(FLOPPY_DMA,"floppy")
101 #define fd_get_dma_residue() vdma_get_dma_residue(FLOPPY_DMA)
102 #define fd_dma_mem_alloc(size) vdma_mem_alloc(size)
103 #define fd_dma_setup(addr, size, mode, io) vdma_dma_setup(addr, size, mode, io)
104 
105 #define fd_enable_irq() /* nothing... */
106 #define fd_disable_irq() /* nothing... */
107 
108 #define fd_free_dma() /* nothing */
109 
110 /* No 64k boundary crossing problems on Q40 - no DMA at all */
111 #define CROSS_64KB(a,s) (0)
112 
113 #define DMA_MODE_READ 0x44 /* i386 look-alike */
114 #define DMA_MODE_WRITE 0x48
115 
116 
117 static int m68k_floppy_init(void)
118 {
119  use_virtual_dma =1;
120  can_use_virtual_dma = 1;
121 
122 
123  if (MACH_IS_Q40)
124  return 0x3f0;
125  else if(MACH_IS_SUN3X)
126  return sun3xflop_init();
127  else
128  return -1;
129 }
130 
131 
132 static int vdma_request_dma(unsigned int dmanr, const char * device_id)
133 {
134  return 0;
135 }
136 
137 
138 static int vdma_get_dma_residue(unsigned int dummy)
139 {
140  return virtual_dma_count + virtual_dma_residue;
141 }
142 
143 
144 static unsigned long vdma_mem_alloc(unsigned long size)
145 {
146  return (unsigned long) vmalloc(size);
147 
148 }
149 
150 static void _fd_dma_mem_free(unsigned long addr, unsigned long size)
151 {
152  vfree((void *)addr);
153 }
154 #define fd_dma_mem_free(addr,size) _fd_dma_mem_free(addr, size)
155 
156 
157 /* choose_dma_mode ???*/
158 
159 static int vdma_dma_setup(char *addr, unsigned long size, int mode, int io)
160 {
161  doing_pdma = 1;
162  virtual_dma_port = (MACH_IS_Q40 ? io : 0);
163  virtual_dma_mode = (mode == DMA_MODE_WRITE);
164  virtual_dma_addr = addr;
165  virtual_dma_count = size;
166  virtual_dma_residue = 0;
167  return 0;
168 }
169 
170 
171 
172 static void fd_disable_dma(void)
173 {
174  doing_pdma = 0;
175  virtual_dma_residue += virtual_dma_count;
176  virtual_dma_count=0;
177 }
178 
179 
180 
181 /* this is the only truly Q40 specific function */
182 
184 {
185  register unsigned char st;
186 
187 #undef TRACE_FLPY_INT
188 #define NO_FLOPPY_ASSEMBLER
189 
190 #ifdef TRACE_FLPY_INT
191  static int calls=0;
192  static int bytes=0;
193  static int dma_wait=0;
194 #endif
195  if(!doing_pdma) {
196  floppy_interrupt(irq, dev_id);
197  return IRQ_HANDLED;
198  }
199 
200 #ifdef TRACE_FLPY_INT
201  if(!calls)
202  bytes = virtual_dma_count;
203 #endif
204 
205  {
206  register int lcount;
207  register char *lptr;
208 
209  /* serve 1st byte fast: */
210 
211  st=1;
212  for(lcount=virtual_dma_count, lptr=virtual_dma_addr;
213  lcount; lcount--, lptr++) {
214  st=inb(virtual_dma_port+4) & 0xa0 ;
215  if(st != 0xa0)
216  break;
217  if(virtual_dma_mode)
218  outb_p(*lptr, virtual_dma_port+5);
219  else
220  *lptr = inb_p(virtual_dma_port+5);
221  }
222 
223  virtual_dma_count = lcount;
224  virtual_dma_addr = lptr;
225  st = inb(virtual_dma_port+4);
226  }
227 
228 #ifdef TRACE_FLPY_INT
229  calls++;
230 #endif
231  if(st == 0x20)
232  return IRQ_HANDLED;
233  if(!(st & 0x20)) {
234  virtual_dma_residue += virtual_dma_count;
235  virtual_dma_count=0;
236 #ifdef TRACE_FLPY_INT
237  printk("count=%x, residue=%x calls=%d bytes=%d dma_wait=%d\n",
238  virtual_dma_count, virtual_dma_residue, calls, bytes,
239  dma_wait);
240  calls = 0;
241  dma_wait=0;
242 #endif
243  doing_pdma = 0;
244  floppy_interrupt(irq, dev_id);
245  return IRQ_HANDLED;
246  }
247 #ifdef TRACE_FLPY_INT
248  if(!virtual_dma_count)
249  dma_wait++;
250 #endif
251  return IRQ_HANDLED;
252 }
253 
254 #define EXTRA_FLOPPY_PARAMS