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 base, int reg) 67 { 68 if(MACH_IS_Q40) 69 return inb_p(base + reg); 70 else if(MACH_IS_SUN3X) 71 return sun3x_82072_fd_inb(base + reg); 72 return 0; 73 } 74 75 static __inline__ void fd_outb(unsigned char value, int base, int reg) 76 { 77 if(MACH_IS_Q40) 78 outb_p(value, base + reg); 79 else if(MACH_IS_SUN3X) 80 sun3x_82072_fd_outb(value, base + reg); 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 #define DMA_MODE_READ 0x44 /* i386 look-alike */ 111 #define DMA_MODE_WRITE 0x48 112 113 static int m68k_floppy_init(void) 114 { 115 use_virtual_dma =1; 116 can_use_virtual_dma = 1; 117 118 119 if (MACH_IS_Q40) 120 return 0x3f0; 121 else if(MACH_IS_SUN3X) 122 return sun3xflop_init(); 123 else 124 return -1; 125 } 126 127 128 static int vdma_request_dma(unsigned int dmanr, const char * device_id) 129 { 130 return 0; 131 } 132 133 134 static int vdma_get_dma_residue(unsigned int dummy) 135 { 136 return virtual_dma_count + virtual_dma_residue; 137 } 138 139 140 static unsigned long vdma_mem_alloc(unsigned long size) 141 { 142 return (unsigned long) vmalloc(size); 143 144 } 145 146 static void _fd_dma_mem_free(unsigned long addr, unsigned long size) 147 { 148 vfree((void *)addr); 149 } 150 #define fd_dma_mem_free(addr,size) _fd_dma_mem_free(addr, size) 151 152 153 /* choose_dma_mode ???*/ 154 155 static int vdma_dma_setup(char *addr, unsigned long size, int mode, int io) 156 { 157 doing_pdma = 1; 158 virtual_dma_port = (MACH_IS_Q40 ? io : 0); 159 virtual_dma_mode = (mode == DMA_MODE_WRITE); 160 virtual_dma_addr = addr; 161 virtual_dma_count = size; 162 virtual_dma_residue = 0; 163 return 0; 164 } 165 166 167 168 static void fd_disable_dma(void) 169 { 170 doing_pdma = 0; 171 virtual_dma_residue += virtual_dma_count; 172 virtual_dma_count=0; 173 } 174 175 176 177 /* this is the only truly Q40 specific function */ 178 179 asmlinkage irqreturn_t floppy_hardint(int irq, void *dev_id) 180 { 181 register unsigned char st; 182 183 #undef TRACE_FLPY_INT 184 #define NO_FLOPPY_ASSEMBLER 185 186 #ifdef TRACE_FLPY_INT 187 static int calls=0; 188 static int bytes=0; 189 static int dma_wait=0; 190 #endif 191 if(!doing_pdma) { 192 floppy_interrupt(irq, dev_id); 193 return IRQ_HANDLED; 194 } 195 196 #ifdef TRACE_FLPY_INT 197 if(!calls) 198 bytes = virtual_dma_count; 199 #endif 200 201 { 202 register int lcount; 203 register char *lptr; 204 205 /* serve 1st byte fast: */ 206 207 st=1; 208 for(lcount=virtual_dma_count, lptr=virtual_dma_addr; 209 lcount; lcount--, lptr++) { 210 st = inb(virtual_dma_port + FD_STATUS); 211 st &= STATUS_DMA | STATUS_READY; 212 if (st != (STATUS_DMA | STATUS_READY)) 213 break; 214 if(virtual_dma_mode) 215 outb_p(*lptr, virtual_dma_port + FD_DATA); 216 else 217 *lptr = inb_p(virtual_dma_port + FD_DATA); 218 } 219 220 virtual_dma_count = lcount; 221 virtual_dma_addr = lptr; 222 st = inb(virtual_dma_port + FD_STATUS); 223 } 224 225 #ifdef TRACE_FLPY_INT 226 calls++; 227 #endif 228 if (st == STATUS_DMA) 229 return IRQ_HANDLED; 230 if (!(st & STATUS_DMA)) { 231 virtual_dma_residue += virtual_dma_count; 232 virtual_dma_count=0; 233 #ifdef TRACE_FLPY_INT 234 pr_info("count=%x, residue=%x calls=%d bytes=%d dma_wait=%d\n", 235 virtual_dma_count, virtual_dma_residue, calls, bytes, 236 dma_wait); 237 calls = 0; 238 dma_wait=0; 239 #endif 240 doing_pdma = 0; 241 floppy_interrupt(irq, dev_id); 242 return IRQ_HANDLED; 243 } 244 #ifdef TRACE_FLPY_INT 245 if(!virtual_dma_count) 246 dma_wait++; 247 #endif 248 return IRQ_HANDLED; 249 } 250 251 #define EXTRA_FLOPPY_PARAMS 252