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Linux/arch/parisc/include/asm/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                                    0, "floppy", NULL);
161         else
162                 return request_irq(FLOPPY_IRQ, floppy_interrupt,
163                                    0, "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,
246                 get_dma_residue,
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 */
272 

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