Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 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_I386_FLOPPY_H |
| 11 | #define __ASM_I386_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(value,port) outb_p(value,port) |
| 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 | |
| 48 | static int virtual_dma_count; |
| 49 | static int virtual_dma_residue; |
| 50 | static char *virtual_dma_addr; |
| 51 | static int virtual_dma_mode; |
| 52 | static int doing_pdma; |
| 53 | |
| 54 | static irqreturn_t floppy_hardint(int irq, void *dev_id, struct pt_regs * regs) |
| 55 | { |
| 56 | register unsigned char st; |
| 57 | |
| 58 | #undef TRACE_FLPY_INT |
| 59 | #define NO_FLOPPY_ASSEMBLER |
| 60 | |
| 61 | #ifdef TRACE_FLPY_INT |
| 62 | static int calls=0; |
| 63 | static int bytes=0; |
| 64 | static int dma_wait=0; |
| 65 | #endif |
| 66 | if (!doing_pdma) |
| 67 | return floppy_interrupt(irq, dev_id, regs); |
| 68 | |
| 69 | #ifdef TRACE_FLPY_INT |
| 70 | if(!calls) |
| 71 | bytes = virtual_dma_count; |
| 72 | #endif |
| 73 | |
| 74 | #ifndef NO_FLOPPY_ASSEMBLER |
| 75 | __asm__ ( |
| 76 | "testl %1,%1" |
| 77 | "je 3f" |
| 78 | "1: inb %w4,%b0" |
| 79 | "andb $160,%b0" |
| 80 | "cmpb $160,%b0" |
| 81 | "jne 2f" |
| 82 | "incw %w4" |
| 83 | "testl %3,%3" |
| 84 | "jne 4f" |
| 85 | "inb %w4,%b0" |
| 86 | "movb %0,(%2)" |
| 87 | "jmp 5f" |
| 88 | "4: movb (%2),%0" |
| 89 | "outb %b0,%w4" |
| 90 | "5: decw %w4" |
| 91 | "outb %0,$0x80" |
| 92 | "decl %1" |
| 93 | "incl %2" |
| 94 | "testl %1,%1" |
| 95 | "jne 1b" |
| 96 | "3: inb %w4,%b0" |
| 97 | "2: " |
| 98 | : "=a" ((char) st), |
| 99 | "=c" ((long) virtual_dma_count), |
| 100 | "=S" ((long) virtual_dma_addr) |
| 101 | : "b" ((long) virtual_dma_mode), |
| 102 | "d" ((short) virtual_dma_port+4), |
| 103 | "1" ((long) virtual_dma_count), |
| 104 | "2" ((long) virtual_dma_addr)); |
| 105 | #else |
| 106 | { |
| 107 | register int lcount; |
| 108 | register char *lptr; |
| 109 | |
| 110 | st = 1; |
| 111 | for(lcount=virtual_dma_count, lptr=virtual_dma_addr; |
| 112 | lcount; lcount--, lptr++) { |
| 113 | st=inb(virtual_dma_port+4) & 0xa0 ; |
| 114 | if(st != 0xa0) |
| 115 | break; |
| 116 | if(virtual_dma_mode) |
| 117 | outb_p(*lptr, virtual_dma_port+5); |
| 118 | else |
| 119 | *lptr = inb_p(virtual_dma_port+5); |
| 120 | } |
| 121 | virtual_dma_count = lcount; |
| 122 | virtual_dma_addr = lptr; |
| 123 | st = inb(virtual_dma_port+4); |
| 124 | } |
| 125 | #endif |
| 126 | |
| 127 | #ifdef TRACE_FLPY_INT |
| 128 | calls++; |
| 129 | #endif |
| 130 | if(st == 0x20) |
| 131 | return IRQ_HANDLED; |
| 132 | if(!(st & 0x20)) { |
| 133 | virtual_dma_residue += virtual_dma_count; |
| 134 | virtual_dma_count=0; |
| 135 | #ifdef TRACE_FLPY_INT |
| 136 | printk("count=%x, residue=%x calls=%d bytes=%d dma_wait=%d\n", |
| 137 | virtual_dma_count, virtual_dma_residue, calls, bytes, |
| 138 | dma_wait); |
| 139 | calls = 0; |
| 140 | dma_wait=0; |
| 141 | #endif |
| 142 | doing_pdma = 0; |
| 143 | floppy_interrupt(irq, dev_id, regs); |
| 144 | return IRQ_HANDLED; |
| 145 | } |
| 146 | #ifdef TRACE_FLPY_INT |
| 147 | if(!virtual_dma_count) |
| 148 | dma_wait++; |
| 149 | #endif |
| 150 | return IRQ_HANDLED; |
| 151 | } |
| 152 | |
| 153 | static void fd_disable_dma(void) |
| 154 | { |
| 155 | if(! (can_use_virtual_dma & 1)) |
| 156 | disable_dma(FLOPPY_DMA); |
| 157 | doing_pdma = 0; |
| 158 | virtual_dma_residue += virtual_dma_count; |
| 159 | virtual_dma_count=0; |
| 160 | } |
| 161 | |
| 162 | static int vdma_request_dma(unsigned int dmanr, const char * device_id) |
| 163 | { |
| 164 | return 0; |
| 165 | } |
| 166 | |
| 167 | static void vdma_nop(unsigned int dummy) |
| 168 | { |
| 169 | } |
| 170 | |
| 171 | |
| 172 | static int vdma_get_dma_residue(unsigned int dummy) |
| 173 | { |
| 174 | return virtual_dma_count + virtual_dma_residue; |
| 175 | } |
| 176 | |
| 177 | |
| 178 | static int fd_request_irq(void) |
| 179 | { |
| 180 | if(can_use_virtual_dma) |
| 181 | return request_irq(FLOPPY_IRQ, floppy_hardint,SA_INTERRUPT, |
| 182 | "floppy", NULL); |
| 183 | else |
| 184 | return request_irq(FLOPPY_IRQ, floppy_interrupt, |
| 185 | SA_INTERRUPT|SA_SAMPLE_RANDOM, |
| 186 | "floppy", NULL); |
| 187 | |
| 188 | } |
| 189 | |
| 190 | static unsigned long dma_mem_alloc(unsigned long size) |
| 191 | { |
| 192 | return __get_dma_pages(GFP_KERNEL,get_order(size)); |
| 193 | } |
| 194 | |
| 195 | |
| 196 | static unsigned long vdma_mem_alloc(unsigned long size) |
| 197 | { |
| 198 | return (unsigned long) vmalloc(size); |
| 199 | |
| 200 | } |
| 201 | |
| 202 | #define nodma_mem_alloc(size) vdma_mem_alloc(size) |
| 203 | |
| 204 | static void _fd_dma_mem_free(unsigned long addr, unsigned long size) |
| 205 | { |
| 206 | if((unsigned int) addr >= (unsigned int) high_memory) |
| 207 | vfree((void *)addr); |
| 208 | else |
| 209 | free_pages(addr, get_order(size)); |
| 210 | } |
| 211 | |
| 212 | #define fd_dma_mem_free(addr, size) _fd_dma_mem_free(addr, size) |
| 213 | |
| 214 | static void _fd_chose_dma_mode(char *addr, unsigned long size) |
| 215 | { |
| 216 | if(can_use_virtual_dma == 2) { |
| 217 | if((unsigned int) addr >= (unsigned int) high_memory || |
| 218 | isa_virt_to_bus(addr) >= 0x1000000 || |
| 219 | _CROSS_64KB(addr, size, 0)) |
| 220 | use_virtual_dma = 1; |
| 221 | else |
| 222 | use_virtual_dma = 0; |
| 223 | } else { |
| 224 | use_virtual_dma = can_use_virtual_dma & 1; |
| 225 | } |
| 226 | } |
| 227 | |
| 228 | #define fd_chose_dma_mode(addr, size) _fd_chose_dma_mode(addr, size) |
| 229 | |
| 230 | |
| 231 | static int vdma_dma_setup(char *addr, unsigned long size, int mode, int io) |
| 232 | { |
| 233 | doing_pdma = 1; |
| 234 | virtual_dma_port = io; |
| 235 | virtual_dma_mode = (mode == DMA_MODE_WRITE); |
| 236 | virtual_dma_addr = addr; |
| 237 | virtual_dma_count = size; |
| 238 | virtual_dma_residue = 0; |
| 239 | return 0; |
| 240 | } |
| 241 | |
| 242 | static int hard_dma_setup(char *addr, unsigned long size, int mode, int io) |
| 243 | { |
| 244 | #ifdef FLOPPY_SANITY_CHECK |
| 245 | if (CROSS_64KB(addr, size)) { |
| 246 | printk("DMA crossing 64-K boundary %p-%p\n", addr, addr+size); |
| 247 | return -1; |
| 248 | } |
| 249 | #endif |
| 250 | /* actual, physical DMA */ |
| 251 | doing_pdma = 0; |
| 252 | clear_dma_ff(FLOPPY_DMA); |
| 253 | set_dma_mode(FLOPPY_DMA,mode); |
| 254 | set_dma_addr(FLOPPY_DMA,isa_virt_to_bus(addr)); |
| 255 | set_dma_count(FLOPPY_DMA,size); |
| 256 | enable_dma(FLOPPY_DMA); |
| 257 | return 0; |
| 258 | } |
| 259 | |
Adrian Bunk | 75c96f8 | 2005-05-05 16:16:09 -0700 | [diff] [blame^] | 260 | static struct fd_routine_l { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 261 | int (*_request_dma)(unsigned int dmanr, const char * device_id); |
| 262 | void (*_free_dma)(unsigned int dmanr); |
| 263 | int (*_get_dma_residue)(unsigned int dummy); |
| 264 | unsigned long (*_dma_mem_alloc) (unsigned long size); |
| 265 | int (*_dma_setup)(char *addr, unsigned long size, int mode, int io); |
| 266 | } fd_routine[] = { |
| 267 | { |
| 268 | request_dma, |
| 269 | free_dma, |
| 270 | get_dma_residue, |
| 271 | dma_mem_alloc, |
| 272 | hard_dma_setup |
| 273 | }, |
| 274 | { |
| 275 | vdma_request_dma, |
| 276 | vdma_nop, |
| 277 | vdma_get_dma_residue, |
| 278 | vdma_mem_alloc, |
| 279 | vdma_dma_setup |
| 280 | } |
| 281 | }; |
| 282 | |
| 283 | |
| 284 | static int FDC1 = 0x3f0; |
| 285 | static int FDC2 = -1; |
| 286 | |
| 287 | /* |
| 288 | * Floppy types are stored in the rtc's CMOS RAM and so rtc_lock |
| 289 | * is needed to prevent corrupted CMOS RAM in case "insmod floppy" |
| 290 | * coincides with another rtc CMOS user. Paul G. |
| 291 | */ |
| 292 | #define FLOPPY0_TYPE ({ \ |
| 293 | unsigned long flags; \ |
| 294 | unsigned char val; \ |
| 295 | spin_lock_irqsave(&rtc_lock, flags); \ |
| 296 | val = (CMOS_READ(0x10) >> 4) & 15; \ |
| 297 | spin_unlock_irqrestore(&rtc_lock, flags); \ |
| 298 | val; \ |
| 299 | }) |
| 300 | |
| 301 | #define FLOPPY1_TYPE ({ \ |
| 302 | unsigned long flags; \ |
| 303 | unsigned char val; \ |
| 304 | spin_lock_irqsave(&rtc_lock, flags); \ |
| 305 | val = CMOS_READ(0x10) & 15; \ |
| 306 | spin_unlock_irqrestore(&rtc_lock, flags); \ |
| 307 | val; \ |
| 308 | }) |
| 309 | |
| 310 | #define N_FDC 2 |
| 311 | #define N_DRIVE 8 |
| 312 | |
| 313 | #define FLOPPY_MOTOR_MASK 0xf0 |
| 314 | |
| 315 | #define AUTO_DMA |
| 316 | |
| 317 | #define EXTRA_FLOPPY_PARAMS |
| 318 | |
| 319 | #endif /* __ASM_I386_FLOPPY_H */ |