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 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) ? 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 */ 214