linux/arch/powerpc/include/asm/floppy.h
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   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_cacheflush(addr,size) /* nothing */
  29#define fd_free_irq()           free_irq(FLOPPY_IRQ, NULL);
  30
  31#include <linux/pci.h>
  32#include <asm/ppc-pci.h>        /* for isa_bridge_pcidev */
  33
  34#define fd_dma_setup(addr,size,mode,io) fd_ops->_dma_setup(addr,size,mode,io)
  35
  36static int fd_request_dma(void);
  37
  38struct fd_dma_ops {
  39        void (*_disable_dma)(unsigned int dmanr);
  40        void (*_free_dma)(unsigned int dmanr);
  41        int (*_get_dma_residue)(unsigned int dummy);
  42        int (*_dma_setup)(char *addr, unsigned long size, int mode, int io);
  43};
  44
  45static int virtual_dma_count;
  46static int virtual_dma_residue;
  47static char *virtual_dma_addr;
  48static int virtual_dma_mode;
  49static int doing_vdma;
  50static struct fd_dma_ops *fd_ops;
  51
  52static irqreturn_t floppy_hardint(int irq, void *dev_id)
  53{
  54        unsigned char st;
  55        int lcount;
  56        char *lptr;
  57
  58        if (!doing_vdma)
  59                return floppy_interrupt(irq, dev_id);
  60
  61
  62        st = 1;
  63        for (lcount=virtual_dma_count, lptr=virtual_dma_addr;
  64             lcount; lcount--, lptr++) {
  65                st=inb(virtual_dma_port+4) & 0xa0 ;
  66                if (st != 0xa0)
  67                        break;
  68                if (virtual_dma_mode)
  69                        outb_p(*lptr, virtual_dma_port+5);
  70                else
  71                        *lptr = inb_p(virtual_dma_port+5);
  72        }
  73        virtual_dma_count = lcount;
  74        virtual_dma_addr = lptr;
  75        st = inb(virtual_dma_port+4);
  76
  77        if (st == 0x20)
  78                return IRQ_HANDLED;
  79        if (!(st & 0x20)) {
  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
  89static 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
  96static void vdma_nop(unsigned int dummy)
  97{
  98}
  99
 100
 101static int vdma_get_dma_residue(unsigned int dummy)
 102{
 103        return virtual_dma_count + virtual_dma_residue;
 104}
 105
 106
 107static int fd_request_irq(void)
 108{
 109        if (can_use_virtual_dma)
 110                return request_irq(FLOPPY_IRQ, floppy_hardint,
 111                                   IRQF_DISABLED, "floppy", NULL);
 112        else
 113                return request_irq(FLOPPY_IRQ, floppy_interrupt,
 114                                   IRQF_DISABLED, "floppy", NULL);
 115}
 116
 117static 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
 128static 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) ? PCI_DMA_FROMDEVICE : PCI_DMA_TODEVICE;
 138
 139        if (bus_addr 
 140            && (addr != prev_addr || size != prev_size || dir != prev_dir)) {
 141                /* different from last time -- unmap prev */
 142                pci_unmap_single(isa_bridge_pcidev, bus_addr, prev_size, prev_dir);
 143                bus_addr = 0;
 144        }
 145
 146        if (!bus_addr)  /* need to map it */
 147                bus_addr = pci_map_single(isa_bridge_pcidev, addr, size, dir);
 148
 149        /* remember this one as prev */
 150        prev_addr = addr;
 151        prev_size = size;
 152        prev_dir = dir;
 153
 154        fd_clear_dma_ff();
 155        fd_cacheflush(addr, size);
 156        fd_set_dma_mode(mode);
 157        set_dma_addr(FLOPPY_DMA, bus_addr);
 158        fd_set_dma_count(size);
 159        virtual_dma_port = io;
 160        fd_enable_dma();
 161
 162        return 0;
 163}
 164
 165static struct fd_dma_ops real_dma_ops =
 166{
 167        ._disable_dma = disable_dma,
 168        ._free_dma = free_dma,
 169        ._get_dma_residue = get_dma_residue,
 170        ._dma_setup = hard_dma_setup
 171};
 172
 173static struct fd_dma_ops virt_dma_ops =
 174{
 175        ._disable_dma = vdma_disable_dma,
 176        ._free_dma = vdma_nop,
 177        ._get_dma_residue = vdma_get_dma_residue,
 178        ._dma_setup = vdma_dma_setup
 179};
 180
 181static int fd_request_dma(void)
 182{
 183        if (can_use_virtual_dma & 1) {
 184                fd_ops = &virt_dma_ops;
 185                return 0;
 186        }
 187        else {
 188                fd_ops = &real_dma_ops;
 189                return request_dma(FLOPPY_DMA, "floppy");
 190        }
 191}
 192
 193static int FDC1 = 0x3f0;
 194static int FDC2 = -1;
 195
 196/*
 197 * Again, the CMOS information not available
 198 */
 199#define FLOPPY0_TYPE 6
 200#define FLOPPY1_TYPE 0
 201
 202#define N_FDC 2                 /* Don't change this! */
 203#define N_DRIVE 8
 204
 205/*
 206 * The PowerPC has no problems with floppy DMA crossing 64k borders.
 207 */
 208#define CROSS_64KB(a,s) (0)
 209
 210#define EXTRA_FLOPPY_PARAMS
 211
 212#endif /* __KERNEL__ */
 213#endif /* __ASM_POWERPC_FLOPPY_H */
 214