arch/powerpc/include/asm/floppy.h

   1 /*
   2  * Architecture specific parts of the Floppy driver
   3  *
   4  * This file is subject to the terms and conditions of the GNU General Public
   5  * License.  See the file "COPYING" in the main directory of this archive
   6  * for more details.
   7  *
   8  * Copyright (C) 1995
   9  */
  10 #ifndef __ASM_POWERPC_FLOPPY_H
  11 #define __ASM_POWERPC_FLOPPY_H
  12 #ifdef __KERNEL__
  13
  14 #include <asm/machdep.h>
  15
  16 #define fd_inb(port)            inb_p(port)
  17 #define fd_outb(value,port)     outb_p(value,port)
  18
  19 #define fd_enable_dma()         enable_dma(FLOPPY_DMA)
  20 #define fd_disable_dma()         fd_ops->_disable_dma(FLOPPY_DMA)
  21 #define fd_free_dma()           fd_ops->_free_dma(FLOPPY_DMA)
  22 #define fd_clear_dma_ff()       clear_dma_ff(FLOPPY_DMA)
  23 #define fd_set_dma_mode(mode)   set_dma_mode(FLOPPY_DMA, mode)
  24 #define fd_set_dma_count(count) set_dma_count(FLOPPY_DMA, count)
  25 #define fd_get_dma_residue()    fd_ops->_get_dma_residue(FLOPPY_DMA)
  26 #define fd_enable_irq()         enable_irq(FLOPPY_IRQ)
  27 #define fd_disable_irq()        disable_irq(FLOPPY_IRQ)
  28 #define fd_free_irq()           free_irq(FLOPPY_IRQ, NULL);
  29
  30 #include <linux/pci.h>
  31 #include <asm/ppc-pci.h>        /* for isa_bridge_pcidev */
  32
  33 #define fd_dma_setup(addr,size,mode,io) fd_ops->_dma_setup(addr,size,mode,io)
  34
  35 static int fd_request_dma(void);
  36
  37 struct fd_dma_ops {
  38         void (*_disable_dma)(unsigned int dmanr);
  39         void (*_free_dma)(unsigned int dmanr);
  40         int (*_get_dma_residue)(unsigned int dummy);
  41         int (*_dma_setup)(char *addr, unsigned long size, int mode, int io);
  42 };
  43
  44 static int virtual_dma_count;
  45 static int virtual_dma_residue;
  46 static char *virtual_dma_addr;
  47 static int virtual_dma_mode;
  48 static int doing_vdma;
  49 static struct fd_dma_ops *fd_ops;
  50
  51 static irqreturn_t floppy_hardint(int irq, void *dev_id)
  52 {
  53         unsigned char st;
  54         int lcount;
  55         char *lptr;
  56
  57         if (!doing_vdma)
  58                 return floppy_interrupt(irq, dev_id);
  59
  60
  61         st = 1;
  62         for (lcount=virtual_dma_count, lptr=virtual_dma_addr;
  63              lcount; lcount--, lptr++) {
  64                 st=inb(virtual_dma_port+4) & 0xa0 ;
  65                 if (st != 0xa0)
  66                         break;
  67                 if (virtual_dma_mode)
  68                         outb_p(*lptr, virtual_dma_port+5);
  69                 else
  70                         *lptr = inb_p(virtual_dma_port+5);
  71         }
  72         virtual_dma_count = lcount;
  73         virtual_dma_addr = lptr;
  74         st = inb(virtual_dma_port+4);
  75
  76         if (st == 0x20)
  77                 return IRQ_HANDLED;
  78         if (!(st & 0x20)) {
  79                 virtual_dma_residue += virtual_dma_count;
  80                 virtual_dma_count=0;
  81                 doing_vdma = 0;
  82                 floppy_interrupt(irq, dev_id);
  83                 return IRQ_HANDLED;
  84         }
  85         return IRQ_HANDLED;
  86 }
  87
  88 static void vdma_disable_dma(unsigned int dummy)
  89 {
  90         doing_vdma = 0;
  91         virtual_dma_residue += virtual_dma_count;
  92         virtual_dma_count=0;
  93 }
  94
  95 static void vdma_nop(unsigned int dummy)
  96 {
  97 }
  98
  99
 100 static int vdma_get_dma_residue(unsigned int dummy)
 101 {
 102         return virtual_dma_count + virtual_dma_residue;
 103 }
 104
 105
 106 static int fd_request_irq(void)
 107 {
 108         if (can_use_virtual_dma)
 109                 return request_irq(FLOPPY_IRQ, floppy_hardint,
 110                                    0, "floppy", NULL);
 111         else
 112                 return request_irq(FLOPPY_IRQ, floppy_interrupt,
 113                                    0, "floppy", NULL);
 114 }
 115
 116 static int vdma_dma_setup(char *addr, unsigned long size, int mode, int io)
 117 {
 118         doing_vdma = 1;
 119         virtual_dma_port = io;
 120         virtual_dma_mode = (mode  == DMA_MODE_WRITE);
 121         virtual_dma_addr = addr;
 122         virtual_dma_count = size;
 123         virtual_dma_residue = 0;
 124         return 0;
 125 }
 126
 127 static int hard_dma_setup(char *addr, unsigned long size, int mode, int io)
 128 {
 129         static unsigned long prev_size;
 130         static dma_addr_t bus_addr = 0;
 131         static char *prev_addr;
 132         static int prev_dir;
 133         int dir;
 134
 135         doing_vdma = 0;
 136         dir = (mode == DMA_MODE_READ) ? PCI_DMA_FROMDEVICE : PCI_DMA_TODEVICE;
 137
 138         if (bus_addr
 139             && (addr != prev_addr || size != prev_size || dir != prev_dir)) {
 140                 /* different from last time -- unmap prev */
 141                 pci_unmap_single(isa_bridge_pcidev, bus_addr, prev_size, prev_dir);
 142                 bus_addr = 0;
 143         }
 144
 145         if (!bus_addr)  /* need to map it */
 146                 bus_addr = pci_map_single(isa_bridge_pcidev, addr, size, dir);
 147
 148         /* remember this one as prev */
 149         prev_addr = addr;
 150         prev_size = size;
 151         prev_dir = dir;
 152
 153         fd_clear_dma_ff();
 154         fd_set_dma_mode(mode);
 155         set_dma_addr(FLOPPY_DMA, bus_addr);
 156         fd_set_dma_count(size);
 157         virtual_dma_port = io;
 158         fd_enable_dma();
 159
 160         return 0;
 161 }
 162
 163 static struct fd_dma_ops real_dma_ops =
 164 {
 165         ._disable_dma = disable_dma,
 166         ._free_dma = free_dma,
 167         ._get_dma_residue = get_dma_residue,
 168         ._dma_setup = hard_dma_setup
 169 };
 170
 171 static struct fd_dma_ops virt_dma_ops =
 172 {
 173         ._disable_dma = vdma_disable_dma,
 174         ._free_dma = vdma_nop,
 175         ._get_dma_residue = vdma_get_dma_residue,
 176         ._dma_setup = vdma_dma_setup
 177 };
 178
 179 static int fd_request_dma(void)
 180 {
 181         if (can_use_virtual_dma & 1) {
 182                 fd_ops = &virt_dma_ops;
 183                 return 0;
 184         }
 185         else {
 186                 fd_ops = &real_dma_ops;
 187                 return request_dma(FLOPPY_DMA, "floppy");
 188         }
 189 }
 190
 191 static int FDC1 = 0x3f0;
 192 static int FDC2 = -1;
 193
 194 /*
 195  * Again, the CMOS information not available
 196  */
 197 #define FLOPPY0_TYPE 6
 198 #define FLOPPY1_TYPE 0
 199
 200 #define N_FDC 2                 /* Don't change this! */
 201 #define N_DRIVE 8
 202
 203 /*
 204  * The PowerPC has no problems with floppy DMA crossing 64k borders.
 205  */
 206 #define CROSS_64KB(a,s) (0)
 207
 208 #define EXTRA_FLOPPY_PARAMS
 209
 210 #endif /* __KERNEL__ */
 211 #endif /* __ASM_POWERPC_FLOPPY_H */