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
  59static int virtual_dma_count=0;
  60static int virtual_dma_residue=0;
  61static char *virtual_dma_addr=0;
  62static int virtual_dma_mode=0;
  63static int doing_pdma=0;
  64
  65static 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
 131static 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
 140static int vdma_request_dma(unsigned int dmanr, const char * device_id)
 141{
 142        return 0;
 143}
 144
 145static void vdma_nop(unsigned int dummy)
 146{
 147}
 148
 149
 150static int vdma_get_dma_residue(unsigned int dummy)
 151{
 152        return virtual_dma_count + virtual_dma_residue;
 153}
 154
 155
 156static 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
 166static unsigned long dma_mem_alloc(unsigned long size)
 167{
 168        return __get_dma_pages(GFP_KERNEL, get_order(size));
 169}
 170
 171
 172static 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
 180static 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
 190static 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
 207static 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
 218static 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
 236static 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
 260static int FDC1 = 0x3f0; /* Lies.  Floppy controller is memory mapped, not io mapped */
 261static 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