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 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 + 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 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) ? DMA_FROM_DEVICE : DMA_TO_DEVICE; 138 139 if (bus_addr 140 && (addr != prev_addr || size != prev_size || dir != prev_dir)) { 141 /* different from last time -- unmap prev */ 142 dma_unmap_single(&isa_bridge_pcidev->dev, bus_addr, prev_size, 143 prev_dir); 144 bus_addr = 0; 145 } 146 147 if (!bus_addr) /* need to map it */ 148 bus_addr = dma_map_single(&isa_bridge_pcidev->dev, addr, size, 149 dir); 150 151 /* remember this one as prev */ 152 prev_addr = addr; 153 prev_size = size; 154 prev_dir = dir; 155 156 fd_clear_dma_ff(); 157 fd_set_dma_mode(mode); 158 set_dma_addr(FLOPPY_DMA, bus_addr); 159 fd_set_dma_count(size); 160 virtual_dma_port = io; 161 fd_enable_dma(); 162 163 return 0; 164 } 165 166 static struct fd_dma_ops real_dma_ops = 167 { 168 ._disable_dma = disable_dma, 169 ._free_dma = free_dma, 170 ._get_dma_residue = get_dma_residue, 171 ._dma_setup = hard_dma_setup 172 }; 173 174 static struct fd_dma_ops virt_dma_ops = 175 { 176 ._disable_dma = vdma_disable_dma, 177 ._free_dma = vdma_nop, 178 ._get_dma_residue = vdma_get_dma_residue, 179 ._dma_setup = vdma_dma_setup 180 }; 181 182 static int fd_request_dma(void) 183 { 184 if (can_use_virtual_dma & 1) { 185 fd_ops = &virt_dma_ops; 186 return 0; 187 } 188 else { 189 fd_ops = &real_dma_ops; 190 return request_dma(FLOPPY_DMA, "floppy"); 191 } 192 } 193 194 static int FDC1 = 0x3f0; 195 static int FDC2 = -1; 196 197 /* 198 * Again, the CMOS information not available 199 */ 200 #define FLOPPY0_TYPE 6 201 #define FLOPPY1_TYPE 0 202 203 #define N_FDC 2 /* Don't change this! */ 204 #define N_DRIVE 8 205 206 /* 207 * The PowerPC has no problems with floppy DMA crossing 64k borders. 208 */ 209 #define CROSS_64KB(a,s) (0) 210 211 #define EXTRA_FLOPPY_PARAMS 212 213 #endif /* __KERNEL__ */ 214 #endif /* __ASM_POWERPC_FLOPPY_H */ 215