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(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
  35static int fd_request_dma(void);
  36
  37struct 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
  44static int virtual_dma_count;
  45static int virtual_dma_residue;
  46static char *virtual_dma_addr;
  47static int virtual_dma_mode;
  48static int doing_vdma;
  49static struct fd_dma_ops *fd_ops;
  50
  51static 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
  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                                   0, "floppy", NULL);
 112        else
 113                return request_irq(FLOPPY_IRQ, floppy_interrupt,
 114                                   0, "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_set_dma_mode(mode);
 156        set_dma_addr(FLOPPY_DMA, bus_addr);
 157        fd_set_dma_count(size);
 158        virtual_dma_port = io;
 159        fd_enable_dma();
 160
 161        return 0;
 162}
 163
 164static struct fd_dma_ops real_dma_ops =
 165{
 166        ._disable_dma = disable_dma,
 167        ._free_dma = free_dma,
 168        ._get_dma_residue = get_dma_residue,
 169        ._dma_setup = hard_dma_setup
 170};
 171
 172static struct fd_dma_ops virt_dma_ops =
 173{
 174        ._disable_dma = vdma_disable_dma,
 175        ._free_dma = vdma_nop,
 176        ._get_dma_residue = vdma_get_dma_residue,
 177        ._dma_setup = vdma_dma_setup
 178};
 179
 180static int fd_request_dma(void)
 181{
 182        if (can_use_virtual_dma & 1) {
 183                fd_ops = &virt_dma_ops;
 184                return 0;
 185        }
 186        else {
 187                fd_ops = &real_dma_ops;
 188                return request_dma(FLOPPY_DMA, "floppy");
 189        }
 190}
 191
 192static int FDC1 = 0x3f0;
 193static int FDC2 = -1;
 194
 195/*
 196 * Again, the CMOS information not available
 197 */
 198#define FLOPPY0_TYPE 6
 199#define FLOPPY1_TYPE 0
 200
 201#define N_FDC 2                 /* Don't change this! */
 202#define N_DRIVE 8
 203
 204/*
 205 * The PowerPC has no problems with floppy DMA crossing 64k borders.
 206 */
 207#define CROSS_64KB(a,s) (0)
 208
 209#define EXTRA_FLOPPY_PARAMS
 210
 211#endif /* __KERNEL__ */
 212#endif /* __ASM_POWERPC_FLOPPY_H */
 213