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floppy.h
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1 /* Architecture specific parts of the Floppy driver
2  *
3  * Linux/PA-RISC Project (http://www.parisc-linux.org/)
4  * Copyright (C) 2000 Matthew Wilcox (willy a debian . org)
5  * Copyright (C) 2000 Dave Kennedy
6  *
7  * This program is free software; you can redistribute it and/or modify
8  * it under the terms of the GNU General Public License as published by
9  * the Free Software Foundation; either version 2 of the License, or
10  * (at your option) any later version.
11  *
12  * This program is distributed in the hope that it will be useful,
13  * but WITHOUT ANY WARRANTY; without even the implied warranty of
14  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
15  * GNU General Public License for more details.
16  *
17  * You should have received a copy of the GNU General Public License
18  * along with this program; if not, write to the Free Software
19  * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
20  */
21 #ifndef __ASM_PARISC_FLOPPY_H
22 #define __ASM_PARISC_FLOPPY_H
23 
24 #include <linux/vmalloc.h>
25 
26 
27 /*
28  * The DMA channel used by the floppy controller cannot access data at
29  * addresses >= 16MB
30  *
31  * Went back to the 1MB limit, as some people had problems with the floppy
32  * driver otherwise. It doesn't matter much for performance anyway, as most
33  * floppy accesses go through the track buffer.
34  */
35 #define _CROSS_64KB(a,s,vdma) \
36 (!vdma && ((unsigned long)(a)/K_64 != ((unsigned long)(a) + (s) - 1) / K_64))
37 
38 #define CROSS_64KB(a,s) _CROSS_64KB(a,s,use_virtual_dma & 1)
39 
40 
41 #define SW fd_routine[use_virtual_dma&1]
42 #define CSW fd_routine[can_use_virtual_dma & 1]
43 
44 
45 #define fd_inb(port) readb(port)
46 #define fd_outb(value, port) writeb(value, port)
47 
48 #define fd_request_dma() CSW._request_dma(FLOPPY_DMA,"floppy")
49 #define fd_free_dma() CSW._free_dma(FLOPPY_DMA)
50 #define fd_enable_irq() enable_irq(FLOPPY_IRQ)
51 #define fd_disable_irq() disable_irq(FLOPPY_IRQ)
52 #define fd_free_irq() free_irq(FLOPPY_IRQ, NULL)
53 #define fd_get_dma_residue() SW._get_dma_residue(FLOPPY_DMA)
54 #define fd_dma_mem_alloc(size) SW._dma_mem_alloc(size)
55 #define fd_dma_setup(addr, size, mode, io) SW._dma_setup(addr, size, mode, io)
56 
57 #define FLOPPY_CAN_FALLBACK_ON_NODMA
58 
59 static int virtual_dma_count=0;
60 static int virtual_dma_residue=0;
61 static char *virtual_dma_addr=0;
62 static int virtual_dma_mode=0;
63 static int doing_pdma=0;
64 
65 static void floppy_hardint(int irq, void *dev_id, struct pt_regs * regs)
66 {
67  register unsigned char st;
68 
69 #undef TRACE_FLPY_INT
70 
71 #ifdef TRACE_FLPY_INT
72  static int calls=0;
73  static int bytes=0;
74  static int dma_wait=0;
75 #endif
76  if (!doing_pdma) {
77  floppy_interrupt(irq, dev_id, regs);
78  return;
79  }
80 
81 #ifdef TRACE_FLPY_INT
82  if(!calls)
83  bytes = virtual_dma_count;
84 #endif
85 
86  {
87  register int lcount;
88  register char *lptr = virtual_dma_addr;
89 
90  for (lcount = virtual_dma_count; lcount; lcount--) {
91  st = fd_inb(virtual_dma_port+4) & 0xa0 ;
92  if (st != 0xa0)
93  break;
94  if (virtual_dma_mode) {
95  fd_outb(*lptr, virtual_dma_port+5);
96  } else {
97  *lptr = fd_inb(virtual_dma_port+5);
98  }
99  lptr++;
100  }
101  virtual_dma_count = lcount;
102  virtual_dma_addr = lptr;
103  st = fd_inb(virtual_dma_port+4);
104  }
105 
106 #ifdef TRACE_FLPY_INT
107  calls++;
108 #endif
109  if (st == 0x20)
110  return;
111  if (!(st & 0x20)) {
112  virtual_dma_residue += virtual_dma_count;
113  virtual_dma_count = 0;
114 #ifdef TRACE_FLPY_INT
115  printk("count=%x, residue=%x calls=%d bytes=%d dma_wait=%d\n",
116  virtual_dma_count, virtual_dma_residue, calls, bytes,
117  dma_wait);
118  calls = 0;
119  dma_wait=0;
120 #endif
121  doing_pdma = 0;
122  floppy_interrupt(irq, dev_id, regs);
123  return;
124  }
125 #ifdef TRACE_FLPY_INT
126  if (!virtual_dma_count)
127  dma_wait++;
128 #endif
129 }
130 
131 static void fd_disable_dma(void)
132 {
133  if(! (can_use_virtual_dma & 1))
134  disable_dma(FLOPPY_DMA);
135  doing_pdma = 0;
136  virtual_dma_residue += virtual_dma_count;
137  virtual_dma_count=0;
138 }
139 
140 static int vdma_request_dma(unsigned int dmanr, const char * device_id)
141 {
142  return 0;
143 }
144 
145 static void vdma_nop(unsigned int dummy)
146 {
147 }
148 
149 
150 static int vdma_get_dma_residue(unsigned int dummy)
151 {
152  return virtual_dma_count + virtual_dma_residue;
153 }
154 
155 
156 static int fd_request_irq(void)
157 {
158  if(can_use_virtual_dma)
159  return request_irq(FLOPPY_IRQ, floppy_hardint,
160  IRQF_DISABLED, "floppy", NULL);
161  else
162  return request_irq(FLOPPY_IRQ, floppy_interrupt,
163  IRQF_DISABLED, "floppy", NULL);
164 }
165 
166 static unsigned long dma_mem_alloc(unsigned long size)
167 {
168  return __get_dma_pages(GFP_KERNEL, get_order(size));
169 }
170 
171 
172 static unsigned long vdma_mem_alloc(unsigned long size)
173 {
174  return (unsigned long) vmalloc(size);
175 
176 }
177 
178 #define nodma_mem_alloc(size) vdma_mem_alloc(size)
179 
180 static void _fd_dma_mem_free(unsigned long addr, unsigned long size)
181 {
182  if((unsigned int) addr >= (unsigned int) high_memory)
183  return vfree((void *)addr);
184  else
185  free_pages(addr, get_order(size));
186 }
187 
188 #define fd_dma_mem_free(addr, size) _fd_dma_mem_free(addr, size)
189 
190 static void _fd_chose_dma_mode(char *addr, unsigned long size)
191 {
192  if(can_use_virtual_dma == 2) {
193  if((unsigned int) addr >= (unsigned int) high_memory ||
194  virt_to_bus(addr) >= 0x1000000 ||
195  _CROSS_64KB(addr, size, 0))
196  use_virtual_dma = 1;
197  else
198  use_virtual_dma = 0;
199  } else {
200  use_virtual_dma = can_use_virtual_dma & 1;
201  }
202 }
203 
204 #define fd_chose_dma_mode(addr, size) _fd_chose_dma_mode(addr, size)
205 
206 
207 static int vdma_dma_setup(char *addr, unsigned long size, int mode, int io)
208 {
209  doing_pdma = 1;
210  virtual_dma_port = io;
211  virtual_dma_mode = (mode == DMA_MODE_WRITE);
212  virtual_dma_addr = addr;
213  virtual_dma_count = size;
214  virtual_dma_residue = 0;
215  return 0;
216 }
217 
218 static int hard_dma_setup(char *addr, unsigned long size, int mode, int io)
219 {
220 #ifdef FLOPPY_SANITY_CHECK
221  if (CROSS_64KB(addr, size)) {
222  printk("DMA crossing 64-K boundary %p-%p\n", addr, addr+size);
223  return -1;
224  }
225 #endif
226  /* actual, physical DMA */
227  doing_pdma = 0;
228  clear_dma_ff(FLOPPY_DMA);
229  set_dma_mode(FLOPPY_DMA,mode);
230  set_dma_addr(FLOPPY_DMA,virt_to_bus(addr));
231  set_dma_count(FLOPPY_DMA,size);
232  enable_dma(FLOPPY_DMA);
233  return 0;
234 }
235 
236 static struct fd_routine_l {
237  int (*_request_dma)(unsigned int dmanr, const char * device_id);
238  void (*_free_dma)(unsigned int dmanr);
239  int (*_get_dma_residue)(unsigned int dummy);
240  unsigned long (*_dma_mem_alloc) (unsigned long size);
241  int (*_dma_setup)(char *addr, unsigned long size, int mode, int io);
242 } fd_routine[] = {
243  {
244  request_dma,
245  free_dma,
247  dma_mem_alloc,
248  hard_dma_setup
249  },
250  {
251  vdma_request_dma,
252  vdma_nop,
253  vdma_get_dma_residue,
254  vdma_mem_alloc,
255  vdma_dma_setup
256  }
257 };
258 
259 
260 static int FDC1 = 0x3f0; /* Lies. Floppy controller is memory mapped, not io mapped */
261 static int FDC2 = -1;
262 
263 #define FLOPPY0_TYPE 0
264 #define FLOPPY1_TYPE 0
265 
266 #define N_FDC 1
267 #define N_DRIVE 8
268 
269 #define EXTRA_FLOPPY_PARAMS
270 
271 #endif /* __ASM_PARISC_FLOPPY_H */