arch/parisc/include/asm/floppy.h

   1 /* SPDX-License-Identifier: GPL-2.0-or-later */
   2 /*    Architecture specific parts of the Floppy driver
   3  *
   4  *    Linux/PA-RISC Project (http://www.parisc-linux.org/)
   5  *    Copyright (C) 2000 Matthew Wilcox (willy a debian . org)
   6  *    Copyright (C) 2000 Dave Kennedy
   7  */
   8 #ifndef __ASM_PARISC_FLOPPY_H
   9 #define __ASM_PARISC_FLOPPY_H
  10
  11 #include <linux/vmalloc.h>
  12
  13
  14 /*
  15  * The DMA channel used by the floppy controller cannot access data at
  16  * addresses >= 16MB
  17  *
  18  * Went back to the 1MB limit, as some people had problems with the floppy
  19  * driver otherwise. It doesn't matter much for performance anyway, as most
  20  * floppy accesses go through the track buffer.
  21  */
  22 #define _CROSS_64KB(a,s,vdma) \
  23 (!(vdma) && ((unsigned long)(a)/K_64 != ((unsigned long)(a) + (s) - 1) / K_64))
  24
  25 #define CROSS_64KB(a,s) _CROSS_64KB(a,s,use_virtual_dma & 1)
  26
  27
  28 #define SW fd_routine[use_virtual_dma&1]
  29 #define CSW fd_routine[can_use_virtual_dma & 1]
  30
  31
  32 #define fd_inb(port)                    readb(port)
  33 #define fd_outb(value, port)            writeb(value, port)
  34
  35 #define fd_request_dma()        CSW._request_dma(FLOPPY_DMA,"floppy")
  36 #define fd_free_dma()           CSW._free_dma(FLOPPY_DMA)
  37 #define fd_enable_irq()         enable_irq(FLOPPY_IRQ)
  38 #define fd_disable_irq()        disable_irq(FLOPPY_IRQ)
  39 #define fd_free_irq()           free_irq(FLOPPY_IRQ, NULL)
  40 #define fd_get_dma_residue()    SW._get_dma_residue(FLOPPY_DMA)
  41 #define fd_dma_mem_alloc(size)  SW._dma_mem_alloc(size)
  42 #define fd_dma_setup(addr, size, mode, io) SW._dma_setup(addr, size, mode, io)
  43
  44 #define FLOPPY_CAN_FALLBACK_ON_NODMA
  45
  46 static int virtual_dma_count=0;
  47 static int virtual_dma_residue=0;
  48 static char *virtual_dma_addr=0;
  49 static int virtual_dma_mode=0;
  50 static int doing_pdma=0;
  51
  52 static void floppy_hardint(int irq, void *dev_id, struct pt_regs * regs)
  53 {
  54         register unsigned char st;
  55
  56 #undef TRACE_FLPY_INT
  57
  58 #ifdef TRACE_FLPY_INT
  59         static int calls=0;
  60         static int bytes=0;
  61         static int dma_wait=0;
  62 #endif
  63         if (!doing_pdma) {
  64                 floppy_interrupt(irq, dev_id, regs);
  65                 return;
  66         }
  67
  68 #ifdef TRACE_FLPY_INT
  69         if(!calls)
  70                 bytes = virtual_dma_count;
  71 #endif
  72
  73         {
  74                 register int lcount;
  75                 register char *lptr = virtual_dma_addr;
  76
  77                 for (lcount = virtual_dma_count; lcount; lcount--) {
  78                         st = fd_inb(virtual_dma_port+4) & 0xa0 ;
  79                         if (st != 0xa0)
  80                                 break;
  81                         if (virtual_dma_mode) {
  82                                 fd_outb(*lptr, virtual_dma_port+5);
  83                         } else {
  84                                 *lptr = fd_inb(virtual_dma_port+5);
  85                         }
  86                         lptr++;
  87                 }
  88                 virtual_dma_count = lcount;
  89                 virtual_dma_addr = lptr;
  90                 st = fd_inb(virtual_dma_port+4);
  91         }
  92
  93 #ifdef TRACE_FLPY_INT
  94         calls++;
  95 #endif
  96         if (st == 0x20)
  97                 return;
  98         if (!(st & 0x20)) {
  99                 virtual_dma_residue += virtual_dma_count;
 100                 virtual_dma_count = 0;
 101 #ifdef TRACE_FLPY_INT
 102                 printk("count=%x, residue=%x calls=%d bytes=%d dma_wait=%d\n",
 103                        virtual_dma_count, virtual_dma_residue, calls, bytes,
 104                        dma_wait);
 105                 calls = 0;
 106                 dma_wait=0;
 107 #endif
 108                 doing_pdma = 0;
 109                 floppy_interrupt(irq, dev_id, regs);
 110                 return;
 111         }
 112 #ifdef TRACE_FLPY_INT
 113         if (!virtual_dma_count)
 114                 dma_wait++;
 115 #endif
 116 }
 117
 118 static void fd_disable_dma(void)
 119 {
 120         if(! (can_use_virtual_dma & 1))
 121                 disable_dma(FLOPPY_DMA);
 122         doing_pdma = 0;
 123         virtual_dma_residue += virtual_dma_count;
 124         virtual_dma_count=0;
 125 }
 126
 127 static int vdma_request_dma(unsigned int dmanr, const char * device_id)
 128 {
 129         return 0;
 130 }
 131
 132 static void vdma_nop(unsigned int dummy)
 133 {
 134 }
 135
 136
 137 static int vdma_get_dma_residue(unsigned int dummy)
 138 {
 139         return virtual_dma_count + virtual_dma_residue;
 140 }
 141
 142
 143 static int fd_request_irq(void)
 144 {
 145         if(can_use_virtual_dma)
 146                 return request_irq(FLOPPY_IRQ, floppy_hardint,
 147                                    0, "floppy", NULL);
 148         else
 149                 return request_irq(FLOPPY_IRQ, floppy_interrupt,
 150                                    0, "floppy", NULL);
 151 }
 152
 153 static unsigned long dma_mem_alloc(unsigned long size)
 154 {
 155         return __get_dma_pages(GFP_KERNEL, get_order(size));
 156 }
 157
 158
 159 static unsigned long vdma_mem_alloc(unsigned long size)
 160 {
 161         return (unsigned long) vmalloc(size);
 162
 163 }
 164
 165 #define nodma_mem_alloc(size) vdma_mem_alloc(size)
 166
 167 static void _fd_dma_mem_free(unsigned long addr, unsigned long size)
 168 {
 169         if((unsigned int) addr >= (unsigned int) high_memory)
 170                 return vfree((void *)addr);
 171         else
 172                 free_pages(addr, get_order(size));
 173 }
 174
 175 #define fd_dma_mem_free(addr, size)  _fd_dma_mem_free(addr, size)
 176
 177 static void _fd_chose_dma_mode(char *addr, unsigned long size)
 178 {
 179         if(can_use_virtual_dma == 2) {
 180                 if((unsigned int) addr >= (unsigned int) high_memory ||
 181                    virt_to_bus(addr) >= 0x1000000 ||
 182                    _CROSS_64KB(addr, size, 0))
 183                         use_virtual_dma = 1;
 184                 else
 185                         use_virtual_dma = 0;
 186         } else {
 187                 use_virtual_dma = can_use_virtual_dma & 1;
 188         }
 189 }
 190
 191 #define fd_chose_dma_mode(addr, size) _fd_chose_dma_mode(addr, size)
 192
 193
 194 static int vdma_dma_setup(char *addr, unsigned long size, int mode, int io)
 195 {
 196         doing_pdma = 1;
 197         virtual_dma_port = io;
 198         virtual_dma_mode = (mode  == DMA_MODE_WRITE);
 199         virtual_dma_addr = addr;
 200         virtual_dma_count = size;
 201         virtual_dma_residue = 0;
 202         return 0;
 203 }
 204
 205 static int hard_dma_setup(char *addr, unsigned long size, int mode, int io)
 206 {
 207 #ifdef FLOPPY_SANITY_CHECK
 208         if (CROSS_64KB(addr, size)) {
 209                 printk("DMA crossing 64-K boundary %p-%p\n", addr, addr+size);
 210                 return -1;
 211         }
 212 #endif
 213         /* actual, physical DMA */
 214         doing_pdma = 0;
 215         clear_dma_ff(FLOPPY_DMA);
 216         set_dma_mode(FLOPPY_DMA,mode);
 217         set_dma_addr(FLOPPY_DMA,virt_to_bus(addr));
 218         set_dma_count(FLOPPY_DMA,size);
 219         enable_dma(FLOPPY_DMA);
 220         return 0;
 221 }
 222
 223 static struct fd_routine_l {
 224         int (*_request_dma)(unsigned int dmanr, const char * device_id);
 225         void (*_free_dma)(unsigned int dmanr);
 226         int (*_get_dma_residue)(unsigned int dummy);
 227         unsigned long (*_dma_mem_alloc) (unsigned long size);
 228         int (*_dma_setup)(char *addr, unsigned long size, int mode, int io);
 229 } fd_routine[] = {
 230         {
 231                 request_dma,
 232                 free_dma,
 233                 get_dma_residue,
 234                 dma_mem_alloc,
 235                 hard_dma_setup
 236         },
 237         {
 238                 vdma_request_dma,
 239                 vdma_nop,
 240                 vdma_get_dma_residue,
 241                 vdma_mem_alloc,
 242                 vdma_dma_setup
 243         }
 244 };
 245
 246
 247 static int FDC1 = 0x3f0; /* Lies.  Floppy controller is memory mapped, not io mapped */
 248 static int FDC2 = -1;
 249
 250 #define FLOPPY0_TYPE    0
 251 #define FLOPPY1_TYPE    0
 252
 253 #define N_FDC 1
 254 #define N_DRIVE 8
 255
 256 #define EXTRA_FLOPPY_PARAMS
 257
 258 #endif /* __ASM_PARISC_FLOPPY_H */