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(base, reg)               readb((base) + (reg))
  33 #define fd_outb(value, base, reg)       writeb(value, (base) + (reg))
  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, FD_STATUS);
  79                         st &= STATUS_DMA | STATUS_READY;
  80                         if (st != (STATUS_DMA | STATUS_READY))
  81                                 break;
  82                         if (virtual_dma_mode) {
  83                                 fd_outb(*lptr, virtual_dma_port, FD_DATA);
  84                         } else {
  85                                 *lptr = fd_inb(virtual_dma_port, FD_DATA);
  86                         }
  87                         lptr++;
  88                 }
  89                 virtual_dma_count = lcount;
  90                 virtual_dma_addr = lptr;
  91                 st = fd_inb(virtual_dma_port, FD_STATUS);
  92         }
  93
  94 #ifdef TRACE_FLPY_INT
  95         calls++;
  96 #endif
  97         if (st == STATUS_DMA)
  98                 return;
  99         if (!(st & STATUS_DMA)) {
 100                 virtual_dma_residue += virtual_dma_count;
 101                 virtual_dma_count = 0;
 102 #ifdef TRACE_FLPY_INT
 103                 printk("count=%x, residue=%x calls=%d bytes=%d dma_wait=%d\n",
 104                        virtual_dma_count, virtual_dma_residue, calls, bytes,
 105                        dma_wait);
 106                 calls = 0;
 107                 dma_wait=0;
 108 #endif
 109                 doing_pdma = 0;
 110                 floppy_interrupt(irq, dev_id, regs);
 111                 return;
 112         }
 113 #ifdef TRACE_FLPY_INT
 114         if (!virtual_dma_count)
 115                 dma_wait++;
 116 #endif
 117 }
 118
 119 static void fd_disable_dma(void)
 120 {
 121         if(! (can_use_virtual_dma & 1))
 122                 disable_dma(FLOPPY_DMA);
 123         doing_pdma = 0;
 124         virtual_dma_residue += virtual_dma_count;
 125         virtual_dma_count=0;
 126 }
 127
 128 static int vdma_request_dma(unsigned int dmanr, const char * device_id)
 129 {
 130         return 0;
 131 }
 132
 133 static void vdma_nop(unsigned int dummy)
 134 {
 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 int fd_request_irq(void)
 145 {
 146         if(can_use_virtual_dma)
 147                 return request_irq(FLOPPY_IRQ, floppy_hardint,
 148                                    0, "floppy", NULL);
 149         else
 150                 return request_irq(FLOPPY_IRQ, floppy_interrupt,
 151                                    0, "floppy", NULL);
 152 }
 153
 154 static unsigned long dma_mem_alloc(unsigned long size)
 155 {
 156         return __get_dma_pages(GFP_KERNEL, get_order(size));
 157 }
 158
 159
 160 static unsigned long vdma_mem_alloc(unsigned long size)
 161 {
 162         return (unsigned long) vmalloc(size);
 163
 164 }
 165
 166 #define nodma_mem_alloc(size) vdma_mem_alloc(size)
 167
 168 static void _fd_dma_mem_free(unsigned long addr, unsigned long size)
 169 {
 170         if((unsigned int) addr >= (unsigned int) high_memory)
 171                 return vfree((void *)addr);
 172         else
 173                 free_pages(addr, get_order(size));
 174 }
 175
 176 #define fd_dma_mem_free(addr, size)  _fd_dma_mem_free(addr, size)
 177
 178 static void _fd_chose_dma_mode(char *addr, unsigned long size)
 179 {
 180         if(can_use_virtual_dma == 2) {
 181                 if((unsigned int) addr >= (unsigned int) high_memory ||
 182                    virt_to_bus(addr) >= 0x1000000 ||
 183                    _CROSS_64KB(addr, size, 0))
 184                         use_virtual_dma = 1;
 185                 else
 186                         use_virtual_dma = 0;
 187         } else {
 188                 use_virtual_dma = can_use_virtual_dma & 1;
 189         }
 190 }
 191
 192 #define fd_chose_dma_mode(addr, size) _fd_chose_dma_mode(addr, size)
 193
 194
 195 static int vdma_dma_setup(char *addr, unsigned long size, int mode, int io)
 196 {
 197         doing_pdma = 1;
 198         virtual_dma_port = io;
 199         virtual_dma_mode = (mode  == DMA_MODE_WRITE);
 200         virtual_dma_addr = addr;
 201         virtual_dma_count = size;
 202         virtual_dma_residue = 0;
 203         return 0;
 204 }
 205
 206 static int hard_dma_setup(char *addr, unsigned long size, int mode, int io)
 207 {
 208 #ifdef FLOPPY_SANITY_CHECK
 209         if (CROSS_64KB(addr, size)) {
 210                 printk("DMA crossing 64-K boundary %p-%p\n", addr, addr+size);
 211                 return -1;
 212         }
 213 #endif
 214         /* actual, physical DMA */
 215         doing_pdma = 0;
 216         clear_dma_ff(FLOPPY_DMA);
 217         set_dma_mode(FLOPPY_DMA,mode);
 218         set_dma_addr(FLOPPY_DMA,virt_to_bus(addr));
 219         set_dma_count(FLOPPY_DMA,size);
 220         enable_dma(FLOPPY_DMA);
 221         return 0;
 222 }
 223
 224 static struct fd_routine_l {
 225         int (*_request_dma)(unsigned int dmanr, const char * device_id);
 226         void (*_free_dma)(unsigned int dmanr);
 227         int (*_get_dma_residue)(unsigned int dummy);
 228         unsigned long (*_dma_mem_alloc) (unsigned long size);
 229         int (*_dma_setup)(char *addr, unsigned long size, int mode, int io);
 230 } fd_routine[] = {
 231         {
 232                 request_dma,
 233                 free_dma,
 234                 get_dma_residue,
 235                 dma_mem_alloc,
 236                 hard_dma_setup
 237         },
 238         {
 239                 vdma_request_dma,
 240                 vdma_nop,
 241                 vdma_get_dma_residue,
 242                 vdma_mem_alloc,
 243                 vdma_dma_setup
 244         }
 245 };
 246
 247
 248 static int FDC1 = 0x3f0; /* Lies.  Floppy controller is memory mapped, not io mapped */
 249 static int FDC2 = -1;
 250
 251 #define FLOPPY0_TYPE    0
 252 #define FLOPPY1_TYPE    0
 253
 254 #define N_FDC 1
 255 #define N_DRIVE 8
 256
 257 #define EXTRA_FLOPPY_PARAMS
 258
 259 #endif /* __ASM_PARISC_FLOPPY_H */