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(base, reg)               inb_p((base) + (reg))
  17 #define fd_outb(value, base, reg)       outb_p(value, (base) + (reg))
  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 + FD_STATUS);
  65                 st &= STATUS_DMA | STATUS_READY;
  66                 if (st != (STATUS_DMA | STATUS_READY))
  67                         break;
  68                 if (virtual_dma_mode)
  69                         outb_p(*lptr, virtual_dma_port + FD_DATA);
  70                 else
  71                         *lptr = inb_p(virtual_dma_port + FD_DATA);
  72         }
  73         virtual_dma_count = lcount;
  74         virtual_dma_addr = lptr;
  75         st = inb(virtual_dma_port + FD_STATUS);
  76
  77         if (st == STATUS_DMA)
  78                 return IRQ_HANDLED;
  79         if (!(st & STATUS_DMA)) {
  80                 virtual_dma_residue += virtual_dma_count;
  81                 virtual_dma_count=0;
  82                 doing_vdma = 0;
  83                 floppy_interrupt(irq, dev_id);
  84                 return IRQ_HANDLED;
  85         }
  86         return IRQ_HANDLED;
  87 }
  88
  89 static void vdma_disable_dma(unsigned int dummy)
  90 {
  91         doing_vdma = 0;
  92         virtual_dma_residue += virtual_dma_count;
  93         virtual_dma_count=0;
  94 }
  95
  96 static void vdma_nop(unsigned int dummy)
  97 {
  98 }
  99
 100
 101 static int vdma_get_dma_residue(unsigned int dummy)
 102 {
 103         return virtual_dma_count + virtual_dma_residue;
 104 }
 105
 106
 107 static int fd_request_irq(void)
 108 {
 109         if (can_use_virtual_dma)
 110                 return request_irq(FLOPPY_IRQ, floppy_hardint,
 111                                    0, "floppy", NULL);
 112         else
 113                 return request_irq(FLOPPY_IRQ, floppy_interrupt,
 114                                    0, "floppy", NULL);
 115 }
 116
 117 static int vdma_dma_setup(char *addr, unsigned long size, int mode, int io)
 118 {
 119         doing_vdma = 1;
 120         virtual_dma_port = io;
 121         virtual_dma_mode = (mode  == DMA_MODE_WRITE);
 122         virtual_dma_addr = addr;
 123         virtual_dma_count = size;
 124         virtual_dma_residue = 0;
 125         return 0;
 126 }
 127
 128 static int hard_dma_setup(char *addr, unsigned long size, int mode, int io)
 129 {
 130         static unsigned long prev_size;
 131         static dma_addr_t bus_addr = 0;
 132         static char *prev_addr;
 133         static int prev_dir;
 134         int dir;
 135
 136         doing_vdma = 0;
 137         dir = (mode == DMA_MODE_READ) ? DMA_FROM_DEVICE : DMA_TO_DEVICE;
 138
 139         if (bus_addr
 140             && (addr != prev_addr || size != prev_size || dir != prev_dir)) {
 141                 /* different from last time -- unmap prev */
 142                 dma_unmap_single(&isa_bridge_pcidev->dev, bus_addr, prev_size,
 143                                  prev_dir);
 144                 bus_addr = 0;
 145         }
 146
 147         if (!bus_addr)  /* need to map it */
 148                 bus_addr = dma_map_single(&isa_bridge_pcidev->dev, addr, size,
 149                                           dir);
 150
 151         /* remember this one as prev */
 152         prev_addr = addr;
 153         prev_size = size;
 154         prev_dir = dir;
 155
 156         fd_clear_dma_ff();
 157         fd_set_dma_mode(mode);
 158         set_dma_addr(FLOPPY_DMA, bus_addr);
 159         fd_set_dma_count(size);
 160         virtual_dma_port = io;
 161         fd_enable_dma();
 162
 163         return 0;
 164 }
 165
 166 static struct fd_dma_ops real_dma_ops =
 167 {
 168         ._disable_dma = disable_dma,
 169         ._free_dma = free_dma,
 170         ._get_dma_residue = get_dma_residue,
 171         ._dma_setup = hard_dma_setup
 172 };
 173
 174 static struct fd_dma_ops virt_dma_ops =
 175 {
 176         ._disable_dma = vdma_disable_dma,
 177         ._free_dma = vdma_nop,
 178         ._get_dma_residue = vdma_get_dma_residue,
 179         ._dma_setup = vdma_dma_setup
 180 };
 181
 182 static int fd_request_dma(void)
 183 {
 184         if (can_use_virtual_dma & 1) {
 185                 fd_ops = &virt_dma_ops;
 186                 return 0;
 187         }
 188         else {
 189                 fd_ops = &real_dma_ops;
 190                 return request_dma(FLOPPY_DMA, "floppy");
 191         }
 192 }
 193
 194 static int FDC1 = 0x3f0;
 195 static int FDC2 = -1;
 196
 197 /*
 198  * Again, the CMOS information not available
 199  */
 200 #define FLOPPY0_TYPE 6
 201 #define FLOPPY1_TYPE 0
 202
 203 #define N_FDC 2                 /* Don't change this! */
 204 #define N_DRIVE 8
 205
 206 /*
 207  * The PowerPC has no problems with floppy DMA crossing 64k borders.
 208  */
 209 #define CROSS_64KB(a,s) (0)
 210
 211 #define EXTRA_FLOPPY_PARAMS
 212
 213 #endif /* __KERNEL__ */
 214 #endif /* __ASM_POWERPC_FLOPPY_H */