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 */ 212