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_X86_64_FLOPPY_H 11#define __ASM_X86_64_FLOPPY_H 12 13#include <linux/vmalloc.h> 14 15 16/* 17 * The DMA channel used by the floppy controller cannot access data at 18 * addresses >= 16MB 19 * 20 * Went back to the 1MB limit, as some people had problems with the floppy 21 * driver otherwise. It doesn't matter much for performance anyway, as most 22 * floppy accesses go through the track buffer. 23 */ 24#define _CROSS_64KB(a,s,vdma) \ 25(!vdma && ((unsigned long)(a)/K_64 != ((unsigned long)(a) + (s) - 1) / K_64)) 26 27#define CROSS_64KB(a,s) _CROSS_64KB(a,s,use_virtual_dma & 1) 28 29 30#define SW fd_routine[use_virtual_dma&1] 31#define CSW fd_routine[can_use_virtual_dma & 1] 32 33 34#define fd_inb(port) inb_p(port) 35#define fd_outb(port,value) outb_p(port,value) 36 37#define fd_request_dma() CSW._request_dma(FLOPPY_DMA,"floppy") 38#define fd_free_dma() CSW._free_dma(FLOPPY_DMA) 39#define fd_enable_irq() enable_irq(FLOPPY_IRQ) 40#define fd_disable_irq() disable_irq(FLOPPY_IRQ) 41#define fd_free_irq() free_irq(FLOPPY_IRQ, NULL) 42#define fd_get_dma_residue() SW._get_dma_residue(FLOPPY_DMA) 43#define fd_dma_mem_alloc(size) SW._dma_mem_alloc(size) 44#define fd_dma_setup(addr, size, mode, io) SW._dma_setup(addr, size, mode, io) 45 46#define FLOPPY_CAN_FALLBACK_ON_NODMA 47 48static int virtual_dma_count; 49static int virtual_dma_residue; 50static char *virtual_dma_addr; 51static int virtual_dma_mode; 52static int doing_pdma; 53 54static void floppy_hardint(int irq, void *dev_id, struct pt_regs * regs) 55{ 56 register unsigned char st; 57 58#undef TRACE_FLPY_INT 59 60#ifdef TRACE_FLPY_INT 61 static int calls=0; 62 static int bytes=0; 63 static int dma_wait=0; 64#endif 65 if(!doing_pdma) { 66 floppy_interrupt(irq, dev_id, regs); 67 return; 68 } 69 70#ifdef TRACE_FLPY_INT 71 if(!calls) 72 bytes = virtual_dma_count; 73#endif 74 75 { 76 register int lcount; 77 register char *lptr; 78 79 st = 1; 80 for(lcount=virtual_dma_count, lptr=virtual_dma_addr; 81 lcount; lcount--, lptr++) { 82 st=inb(virtual_dma_port+4) & 0xa0 ; 83 if(st != 0xa0) 84 break; 85 if(virtual_dma_mode) 86 outb_p(*lptr, virtual_dma_port+5); 87 else 88 *lptr = inb_p(virtual_dma_port+5); 89 } 90 virtual_dma_count = lcount; 91 virtual_dma_addr = lptr; 92 st = inb(virtual_dma_port+4); 93 } 94 95#ifdef TRACE_FLPY_INT 96 calls++; 97#endif 98 if(st == 0x20) 99 return; 100 if(!(st & 0x20)) { 101 virtual_dma_residue += virtual_dma_count; 102 virtual_dma_count=0; 103#ifdef TRACE_FLPY_INT 104 printk("count=%x, residue=%x calls=%d bytes=%d dma_wait=%d\n", 105 virtual_dma_count, virtual_dma_residue, calls, bytes, 106 dma_wait); 107 calls = 0; 108 dma_wait=0; 109#endif 110 doing_pdma = 0; 111 floppy_interrupt(irq, dev_id, regs); 112 return; 113 } 114#ifdef TRACE_FLPY_INT 115 if(!virtual_dma_count) 116 dma_wait++; 117#endif 118} 119 120static void fd_disable_dma(void) 121{ 122 if(! (can_use_virtual_dma & 1)) 123 disable_dma(FLOPPY_DMA); 124 doing_pdma = 0; 125 virtual_dma_residue += virtual_dma_count; 126 virtual_dma_count=0; 127} 128 129static int vdma_request_dma(unsigned int dmanr, const char * device_id) 130{ 131 return 0; 132} 133 134static void vdma_nop(unsigned int dummy) 135{ 136} 137 138 139static int vdma_get_dma_residue(unsigned int dummy) 140{ 141 return virtual_dma_count + virtual_dma_residue; 142} 143 144 145static int fd_request_irq(void) 146{ 147 if(can_use_virtual_dma) 148 return request_irq(FLOPPY_IRQ, floppy_hardint,SA_INTERRUPT, 149 "floppy", NULL); 150 else 151 return request_irq(FLOPPY_IRQ, floppy_interrupt, 152 SA_INTERRUPT|SA_SAMPLE_RANDOM, 153 "floppy", NULL); 154 155} 156 157static unsigned long dma_mem_alloc(unsigned long size) 158{ 159 return __get_dma_pages(GFP_KERNEL,get_order(size)); 160} 161 162 163static unsigned long vdma_mem_alloc(unsigned long size) 164{ 165 return (unsigned long) vmalloc(size); 166 167} 168 169#define nodma_mem_alloc(size) vdma_mem_alloc(size) 170 171static void _fd_dma_mem_free(unsigned long addr, unsigned long size) 172{ 173 if((unsigned long) addr >= (unsigned long) high_memory) 174 return vfree((void *)addr); 175 else 176 free_pages(addr, get_order(size)); 177} 178 179#define fd_dma_mem_free(addr, size) _fd_dma_mem_free(addr, size) 180 181static void _fd_chose_dma_mode(char *addr, unsigned long size) 182{ 183 if(can_use_virtual_dma == 2) { 184 if((unsigned long) addr >= (unsigned long) high_memory || 185 virt_to_bus(addr) >= 0x1000000 || 186 _CROSS_64KB(addr, size, 0)) 187 use_virtual_dma = 1; 188 else 189 use_virtual_dma = 0; 190 } else { 191 use_virtual_dma = can_use_virtual_dma & 1; 192 } 193} 194 195#define fd_chose_dma_mode(addr, size) _fd_chose_dma_mode(addr, size) 196 197 198static int vdma_dma_setup(char *addr, unsigned long size, int mode, int io) 199{ 200 doing_pdma = 1; 201 virtual_dma_port = io; 202 virtual_dma_mode = (mode == DMA_MODE_WRITE); 203 virtual_dma_addr = addr; 204 virtual_dma_count = size; 205 virtual_dma_residue = 0; 206 return 0; 207} 208 209static int hard_dma_setup(char *addr, unsigned long size, int mode, int io) 210{ 211#ifdef FLOPPY_SANITY_CHECK 212 if (CROSS_64KB(addr, size)) { 213 printk("DMA crossing 64-K boundary %p-%p\n", addr, addr+size); 214 return -1; 215 } 216#endif 217 /* actual, physical DMA */ 218 doing_pdma = 0; 219 clear_dma_ff(FLOPPY_DMA); 220 set_dma_mode(FLOPPY_DMA,mode); 221 set_dma_addr(FLOPPY_DMA,virt_to_bus(addr)); 222 set_dma_count(FLOPPY_DMA,size); 223 enable_dma(FLOPPY_DMA); 224 return 0; 225} 226 227struct fd_routine_l { 228 int (*_request_dma)(unsigned int dmanr, const char * device_id); 229 void (*_free_dma)(unsigned int dmanr); 230 int (*_get_dma_residue)(unsigned int dummy); 231 unsigned long (*_dma_mem_alloc) (unsigned long size); 232 int (*_dma_setup)(char *addr, unsigned long size, int mode, int io); 233} fd_routine[] = { 234 { 235 request_dma, 236 free_dma, 237 get_dma_residue, 238 dma_mem_alloc, 239 hard_dma_setup 240 }, 241 { 242 vdma_request_dma, 243 vdma_nop, 244 vdma_get_dma_residue, 245 vdma_mem_alloc, 246 vdma_dma_setup 247 } 248}; 249 250 251static int FDC1 = 0x3f0; 252static int FDC2 = -1; 253 254/* 255 * Floppy types are stored in the rtc's CMOS RAM and so rtc_lock 256 * is needed to prevent corrupted CMOS RAM in case "insmod floppy" 257 * coincides with another rtc CMOS user. Paul G. 258 */ 259#define FLOPPY0_TYPE ({ \ 260 unsigned long flags; \ 261 unsigned char val; \ 262 spin_lock_irqsave(&rtc_lock, flags); \ 263 val = (CMOS_READ(0x10) >> 4) & 15; \ 264 spin_unlock_irqrestore(&rtc_lock, flags); \ 265 val; \ 266}) 267 268#define FLOPPY1_TYPE ({ \ 269 unsigned long flags; \ 270 unsigned char val; \ 271 spin_lock_irqsave(&rtc_lock, flags); \ 272 val = CMOS_READ(0x10) & 15; \ 273 spin_unlock_irqrestore(&rtc_lock, flags); \ 274 val; \ 275}) 276 277#define N_FDC 2 278#define N_DRIVE 8 279 280#define FLOPPY_MOTOR_MASK 0xf0 281 282#define AUTO_DMA 283 284#define EXTRA_FLOPPY_PARAMS 285 286#endif /* __ASM_X86_64_FLOPPY_H */ 287