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 20asmlinkage 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#define FLOPPY_MOTOR_MASK 0xf0 35 36 37/* basically PC init + set use_virtual_dma */ 38#define FDC1 m68k_floppy_init() 39 40#define N_FDC 1 41#define N_DRIVE 8 42 43 44/* vdma globals adapted from asm-i386/floppy.h */ 45 46static int virtual_dma_count=0; 47static int virtual_dma_residue=0; 48static char *virtual_dma_addr=NULL; 49static int virtual_dma_mode=0; 50static int doing_pdma=0; 51 52#include <asm/sun3xflop.h> 53 54extern spinlock_t dma_spin_lock; 55 56static __inline__ unsigned long claim_dma_lock(void) 57{ 58 unsigned long flags; 59 spin_lock_irqsave(&dma_spin_lock, flags); 60 return flags; 61} 62 63static __inline__ void release_dma_lock(unsigned long flags) 64{ 65 spin_unlock_irqrestore(&dma_spin_lock, flags); 66} 67 68 69static __inline__ unsigned char fd_inb(int port) 70{ 71 if(MACH_IS_Q40) 72 return inb_p(port); 73 else if(MACH_IS_SUN3X) 74 return sun3x_82072_fd_inb(port); 75 return 0; 76} 77 78static __inline__ void fd_outb(unsigned char value, int port) 79{ 80 if(MACH_IS_Q40) 81 outb_p(value, port); 82 else if(MACH_IS_SUN3X) 83 sun3x_82072_fd_outb(value, port); 84} 85 86 87static int fd_request_irq(void) 88{ 89 if(MACH_IS_Q40) 90 return request_irq(FLOPPY_IRQ, floppy_hardint, 91 IRQF_DISABLED, "floppy", floppy_hardint); 92 else if(MACH_IS_SUN3X) 93 return sun3xflop_request_irq(); 94 return -ENXIO; 95} 96 97static void fd_free_irq(void) 98{ 99 if(MACH_IS_Q40) 100 free_irq(FLOPPY_IRQ, floppy_hardint); 101} 102 103#define fd_request_dma() vdma_request_dma(FLOPPY_DMA,"floppy") 104#define fd_get_dma_residue() vdma_get_dma_residue(FLOPPY_DMA) 105#define fd_dma_mem_alloc(size) vdma_mem_alloc(size) 106#define fd_dma_setup(addr, size, mode, io) vdma_dma_setup(addr, size, mode, io) 107 108#define fd_enable_irq() /* nothing... */ 109#define fd_disable_irq() /* nothing... */ 110 111#define fd_free_dma() /* nothing */ 112 113/* No 64k boundary crossing problems on Q40 - no DMA at all */ 114#define CROSS_64KB(a,s) (0) 115 116#define DMA_MODE_READ 0x44 /* i386 look-alike */ 117#define DMA_MODE_WRITE 0x48 118 119 120static int m68k_floppy_init(void) 121{ 122 use_virtual_dma =1; 123 can_use_virtual_dma = 1; 124 125 126 if (MACH_IS_Q40) 127 return 0x3f0; 128 else if(MACH_IS_SUN3X) 129 return sun3xflop_init(); 130 else 131 return -1; 132} 133 134 135static int vdma_request_dma(unsigned int dmanr, const char * device_id) 136{ 137 return 0; 138} 139 140 141static int vdma_get_dma_residue(unsigned int dummy) 142{ 143 return virtual_dma_count + virtual_dma_residue; 144} 145 146 147static unsigned long vdma_mem_alloc(unsigned long size) 148{ 149 return (unsigned long) vmalloc(size); 150 151} 152 153static void _fd_dma_mem_free(unsigned long addr, unsigned long size) 154{ 155 vfree((void *)addr); 156} 157#define fd_dma_mem_free(addr,size) _fd_dma_mem_free(addr, size) 158 159 160/* choose_dma_mode ???*/ 161 162static int vdma_dma_setup(char *addr, unsigned long size, int mode, int io) 163{ 164 doing_pdma = 1; 165 virtual_dma_port = (MACH_IS_Q40 ? io : 0); 166 virtual_dma_mode = (mode == DMA_MODE_WRITE); 167 virtual_dma_addr = addr; 168 virtual_dma_count = size; 169 virtual_dma_residue = 0; 170 return 0; 171} 172 173 174 175static void fd_disable_dma(void) 176{ 177 doing_pdma = 0; 178 virtual_dma_residue += virtual_dma_count; 179 virtual_dma_count=0; 180} 181 182 183 184/* this is the only truly Q40 specific function */ 185 186asmlinkage irqreturn_t floppy_hardint(int irq, void *dev_id) 187{ 188 register unsigned char st; 189 190#undef TRACE_FLPY_INT 191#define NO_FLOPPY_ASSEMBLER 192 193#ifdef TRACE_FLPY_INT 194 static int calls=0; 195 static int bytes=0; 196 static int dma_wait=0; 197#endif 198 if(!doing_pdma) { 199 floppy_interrupt(irq, dev_id); 200 return IRQ_HANDLED; 201 } 202 203#ifdef TRACE_FLPY_INT 204 if(!calls) 205 bytes = virtual_dma_count; 206#endif 207 208 { 209 register int lcount; 210 register char *lptr; 211 212 /* serve 1st byte fast: */ 213 214 st=1; 215 for(lcount=virtual_dma_count, lptr=virtual_dma_addr; 216 lcount; lcount--, lptr++) { 217 st=inb(virtual_dma_port+4) & 0xa0 ; 218 if(st != 0xa0) 219 break; 220 if(virtual_dma_mode) 221 outb_p(*lptr, virtual_dma_port+5); 222 else 223 *lptr = inb_p(virtual_dma_port+5); 224 } 225 226 virtual_dma_count = lcount; 227 virtual_dma_addr = lptr; 228 st = inb(virtual_dma_port+4); 229 } 230 231#ifdef TRACE_FLPY_INT 232 calls++; 233#endif 234 if(st == 0x20) 235 return IRQ_HANDLED; 236 if(!(st & 0x20)) { 237 virtual_dma_residue += virtual_dma_count; 238 virtual_dma_count=0; 239#ifdef TRACE_FLPY_INT 240 printk("count=%x, residue=%x calls=%d bytes=%d dma_wait=%d\n", 241 virtual_dma_count, virtual_dma_residue, calls, bytes, 242 dma_wait); 243 calls = 0; 244 dma_wait=0; 245#endif 246 doing_pdma = 0; 247 floppy_interrupt(irq, dev_id); 248 return IRQ_HANDLED; 249 } 250#ifdef TRACE_FLPY_INT 251 if(!virtual_dma_count) 252 dma_wait++; 253#endif 254 return IRQ_HANDLED; 255} 256 257#define EXTRA_FLOPPY_PARAMS 258