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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
  36 static int fd_request_dma(void);
  37
  38 struct 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
  45 static int virtual_dma_count;
  46 static int virtual_dma_residue;
  47 static char *virtual_dma_addr;
  48 static int virtual_dma_mode;
  49 static int doing_vdma;
  50 static struct fd_dma_ops *fd_ops;
  51
  52 static 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
  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                                    IRQF_DISABLED, "floppy", NULL);
 112         else
 113                 return request_irq(FLOPPY_IRQ, floppy_interrupt,
 114                                    IRQF_DISABLED, "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) ? 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
 165 static 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
 173 static 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
 181 static 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
 193 static int FDC1 = 0x3f0;
 194 static 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 */