1 /* 2 * Implementation independent bits of the Floppy driver. 3 * 4 * much of this file is derived from what was originally the Q40 floppy driver. 5 * 6 * This file is subject to the terms and conditions of the GNU General Public 7 * License. See the file "COPYING" in the main directory of this archive 8 * for more details. 9 * 10 * Copyright (C) 1999, 2000, 2001 11 * 12 * Sun3x support added 2/4/2000 Sam Creasey (sammy@sammy.net) 13 * 14 */ 15 16 #include <asm/io.h> 17 18 #include <linux/vmalloc.h> 19 20 asmlinkage irqreturn_t floppy_hardint(int irq, void *dev_id); 21 22 /* constants... */ 23 24 #undef MAX_DMA_ADDRESS 25 #define MAX_DMA_ADDRESS 0x00 /* nothing like that */ 26 27 28 /* 29 * Again, the CMOS information doesn't work on m68k.. 30 */ 31 #define FLOPPY0_TYPE (MACH_IS_Q40 ? 6 : 4) 32 #define FLOPPY1_TYPE 0 33 34 /* basically PC init + set use_virtual_dma */ 35 #define FDC1 m68k_floppy_init() 36 37 #define N_FDC 1 38 #define N_DRIVE 8 39 40 41 /* vdma globals adapted from asm-i386/floppy.h */ 42 43 static int virtual_dma_count=0; 44 static int virtual_dma_residue=0; 45 static char *virtual_dma_addr=NULL; 46 static int virtual_dma_mode=0; 47 static int doing_pdma=0; 48 49 #include <asm/sun3xflop.h> 50 51 extern spinlock_t dma_spin_lock; 52 53 static __inline__ unsigned long claim_dma_lock(void) 54 { 55 unsigned long flags; 56 spin_lock_irqsave(&dma_spin_lock, flags); 57 return flags; 58 } 59 60 static __inline__ void release_dma_lock(unsigned long flags) 61 { 62 spin_unlock_irqrestore(&dma_spin_lock, flags); 63 } 64 65 66 static __inline__ unsigned char fd_inb(int port) 67 { 68 if(MACH_IS_Q40) 69 return inb_p(port); 70 else if(MACH_IS_SUN3X) 71 return sun3x_82072_fd_inb(port); 72 return 0; 73 } 74 75 static __inline__ void fd_outb(unsigned char value, int port) 76 { 77 if(MACH_IS_Q40) 78 outb_p(value, port); 79 else if(MACH_IS_SUN3X) 80 sun3x_82072_fd_outb(value, port); 81 } 82 83 84 static int fd_request_irq(void) 85 { 86 if(MACH_IS_Q40) 87 return request_irq(FLOPPY_IRQ, floppy_hardint, 88 0, "floppy", floppy_hardint); 89 else if(MACH_IS_SUN3X) 90 return sun3xflop_request_irq(); 91 return -ENXIO; 92 } 93 94 static void fd_free_irq(void) 95 { 96 if(MACH_IS_Q40) 97 free_irq(FLOPPY_IRQ, floppy_hardint); 98 } 99 100 #define fd_request_dma() vdma_request_dma(FLOPPY_DMA,"floppy") 101 #define fd_get_dma_residue() vdma_get_dma_residue(FLOPPY_DMA) 102 #define fd_dma_mem_alloc(size) vdma_mem_alloc(size) 103 #define fd_dma_setup(addr, size, mode, io) vdma_dma_setup(addr, size, mode, io) 104 105 #define fd_enable_irq() /* nothing... */ 106 #define fd_disable_irq() /* nothing... */ 107 108 #define fd_free_dma() /* nothing */ 109 110 /* No 64k boundary crossing problems on Q40 - no DMA at all */ 111 #define CROSS_64KB(a,s) (0) 112 113 #define DMA_MODE_READ 0x44 /* i386 look-alike */ 114 #define DMA_MODE_WRITE 0x48 115 116 117 static int m68k_floppy_init(void) 118 { 119 use_virtual_dma =1; 120 can_use_virtual_dma = 1; 121 122 123 if (MACH_IS_Q40) 124 return 0x3f0; 125 else if(MACH_IS_SUN3X) 126 return sun3xflop_init(); 127 else 128 return -1; 129 } 130 131 132 static int vdma_request_dma(unsigned int dmanr, const char * device_id) 133 { 134 return 0; 135 } 136 137 138 static int vdma_get_dma_residue(unsigned int dummy) 139 { 140 return virtual_dma_count + virtual_dma_residue; 141 } 142 143 144 static unsigned long vdma_mem_alloc(unsigned long size) 145 { 146 return (unsigned long) vmalloc(size); 147 148 } 149 150 static void _fd_dma_mem_free(unsigned long addr, unsigned long size) 151 { 152 vfree((void *)addr); 153 } 154 #define fd_dma_mem_free(addr,size) _fd_dma_mem_free(addr, size) 155 156 157 /* choose_dma_mode ???*/ 158 159 static int vdma_dma_setup(char *addr, unsigned long size, int mode, int io) 160 { 161 doing_pdma = 1; 162 virtual_dma_port = (MACH_IS_Q40 ? io : 0); 163 virtual_dma_mode = (mode == DMA_MODE_WRITE); 164 virtual_dma_addr = addr; 165 virtual_dma_count = size; 166 virtual_dma_residue = 0; 167 return 0; 168 } 169 170 171 172 static void fd_disable_dma(void) 173 { 174 doing_pdma = 0; 175 virtual_dma_residue += virtual_dma_count; 176 virtual_dma_count=0; 177 } 178 179 180 181 /* this is the only truly Q40 specific function */ 182 183 asmlinkage irqreturn_t floppy_hardint(int irq, void *dev_id) 184 { 185 register unsigned char st; 186 187 #undef TRACE_FLPY_INT 188 #define NO_FLOPPY_ASSEMBLER 189 190 #ifdef TRACE_FLPY_INT 191 static int calls=0; 192 static int bytes=0; 193 static int dma_wait=0; 194 #endif 195 if(!doing_pdma) { 196 floppy_interrupt(irq, dev_id); 197 return IRQ_HANDLED; 198 } 199 200 #ifdef TRACE_FLPY_INT 201 if(!calls) 202 bytes = virtual_dma_count; 203 #endif 204 205 { 206 register int lcount; 207 register char *lptr; 208 209 /* serve 1st byte fast: */ 210 211 st=1; 212 for(lcount=virtual_dma_count, lptr=virtual_dma_addr; 213 lcount; lcount--, lptr++) { 214 st=inb(virtual_dma_port+4) & 0xa0 ; 215 if(st != 0xa0) 216 break; 217 if(virtual_dma_mode) 218 outb_p(*lptr, virtual_dma_port+5); 219 else 220 *lptr = inb_p(virtual_dma_port+5); 221 } 222 223 virtual_dma_count = lcount; 224 virtual_dma_addr = lptr; 225 st = inb(virtual_dma_port+4); 226 } 227 228 #ifdef TRACE_FLPY_INT 229 calls++; 230 #endif 231 if(st == 0x20) 232 return IRQ_HANDLED; 233 if(!(st & 0x20)) { 234 virtual_dma_residue += virtual_dma_count; 235 virtual_dma_count=0; 236 #ifdef TRACE_FLPY_INT 237 printk("count=%x, residue=%x calls=%d bytes=%d dma_wait=%d\n", 238 virtual_dma_count, virtual_dma_residue, calls, bytes, 239 dma_wait); 240 calls = 0; 241 dma_wait=0; 242 #endif 243 doing_pdma = 0; 244 floppy_interrupt(irq, dev_id); 245 return IRQ_HANDLED; 246 } 247 #ifdef TRACE_FLPY_INT 248 if(!virtual_dma_count) 249 dma_wait++; 250 #endif 251 return IRQ_HANDLED; 252 } 253 254 #define EXTRA_FLOPPY_PARAMS 255