Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame^] | 1 | /* |
| 2 | * Architecture specific parts of the Floppy driver |
| 3 | * include/asm-i386/floppy.h |
| 4 | * |
| 5 | * This file is subject to the terms and conditions of the GNU General Public |
| 6 | * License. See the file "COPYING" in the main directory of this archive |
| 7 | * for more details. |
| 8 | * |
| 9 | * Copyright (C) 1995 |
| 10 | */ |
| 11 | #ifndef __ASM_SH_FLOPPY_H |
| 12 | #define __ASM_SH_FLOPPY_H |
| 13 | |
| 14 | #include <linux/vmalloc.h> |
| 15 | |
| 16 | |
| 17 | /* |
| 18 | * The DMA channel used by the floppy controller cannot access data at |
| 19 | * addresses >= 16MB |
| 20 | * |
| 21 | * Went back to the 1MB limit, as some people had problems with the floppy |
| 22 | * driver otherwise. It doesn't matter much for performance anyway, as most |
| 23 | * floppy accesses go through the track buffer. |
| 24 | */ |
| 25 | #define _CROSS_64KB(a,s,vdma) \ |
| 26 | (!vdma && ((unsigned long)(a)/K_64 != ((unsigned long)(a) + (s) - 1) / K_64)) |
| 27 | |
| 28 | #define CROSS_64KB(a,s) _CROSS_64KB(a,s,use_virtual_dma & 1) |
| 29 | |
| 30 | |
| 31 | #define SW fd_routine[use_virtual_dma&1] |
| 32 | #define CSW fd_routine[can_use_virtual_dma & 1] |
| 33 | |
| 34 | |
| 35 | #define fd_inb(port) inb_p(port) |
| 36 | #define fd_outb(value,port) outb_p(value,port) |
| 37 | |
| 38 | #define fd_request_dma() CSW._request_dma(FLOPPY_DMA,"floppy") |
| 39 | #define fd_free_dma() CSW._free_dma(FLOPPY_DMA) |
| 40 | #define fd_enable_irq() enable_irq(FLOPPY_IRQ) |
| 41 | #define fd_disable_irq() disable_irq(FLOPPY_IRQ) |
| 42 | #define fd_free_irq() free_irq(FLOPPY_IRQ, NULL) |
| 43 | #define fd_get_dma_residue() SW._get_dma_residue(FLOPPY_DMA) |
| 44 | #define fd_dma_mem_alloc(size) SW._dma_mem_alloc(size) |
| 45 | #define fd_dma_setup(addr, size, mode, io) SW._dma_setup(addr, size, mode, io) |
| 46 | |
| 47 | #define FLOPPY_CAN_FALLBACK_ON_NODMA |
| 48 | |
| 49 | static int virtual_dma_count; |
| 50 | static int virtual_dma_residue; |
| 51 | static char *virtual_dma_addr; |
| 52 | static int virtual_dma_mode; |
| 53 | static int doing_pdma; |
| 54 | |
| 55 | static void floppy_hardint(int irq, void *dev_id, struct pt_regs * regs) |
| 56 | { |
| 57 | register unsigned char st; |
| 58 | |
| 59 | #undef TRACE_FLPY_INT |
| 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 | floppy_interrupt(irq, dev_id, regs); |
| 68 | return; |
| 69 | } |
| 70 | |
| 71 | #ifdef TRACE_FLPY_INT |
| 72 | if(!calls) |
| 73 | bytes = virtual_dma_count; |
| 74 | #endif |
| 75 | |
| 76 | { |
| 77 | register int lcount; |
| 78 | register char *lptr; |
| 79 | |
| 80 | st = 1; |
| 81 | for(lcount=virtual_dma_count, lptr=virtual_dma_addr; |
| 82 | lcount; lcount--, lptr++) { |
| 83 | st=inb(virtual_dma_port+4) & 0xa0 ; |
| 84 | if(st != 0xa0) |
| 85 | break; |
| 86 | if(virtual_dma_mode) |
| 87 | outb_p(*lptr, virtual_dma_port+5); |
| 88 | else |
| 89 | *lptr = inb_p(virtual_dma_port+5); |
| 90 | } |
| 91 | virtual_dma_count = lcount; |
| 92 | virtual_dma_addr = lptr; |
| 93 | st = inb(virtual_dma_port+4); |
| 94 | } |
| 95 | |
| 96 | #ifdef TRACE_FLPY_INT |
| 97 | calls++; |
| 98 | #endif |
| 99 | if(st == 0x20) |
| 100 | return; |
| 101 | if(!(st & 0x20)) { |
| 102 | virtual_dma_residue += virtual_dma_count; |
| 103 | virtual_dma_count=0; |
| 104 | #ifdef TRACE_FLPY_INT |
| 105 | printk("count=%x, residue=%x calls=%d bytes=%d dma_wait=%d\n", |
| 106 | virtual_dma_count, virtual_dma_residue, calls, bytes, |
| 107 | dma_wait); |
| 108 | calls = 0; |
| 109 | dma_wait=0; |
| 110 | #endif |
| 111 | doing_pdma = 0; |
| 112 | floppy_interrupt(irq, dev_id, regs); |
| 113 | return; |
| 114 | } |
| 115 | #ifdef TRACE_FLPY_INT |
| 116 | if(!virtual_dma_count) |
| 117 | dma_wait++; |
| 118 | #endif |
| 119 | } |
| 120 | |
| 121 | static void fd_disable_dma(void) |
| 122 | { |
| 123 | if(! (can_use_virtual_dma & 1)) |
| 124 | disable_dma(FLOPPY_DMA); |
| 125 | doing_pdma = 0; |
| 126 | virtual_dma_residue += virtual_dma_count; |
| 127 | virtual_dma_count=0; |
| 128 | } |
| 129 | |
| 130 | static int vdma_request_dma(unsigned int dmanr, const char * device_id) |
| 131 | { |
| 132 | return 0; |
| 133 | } |
| 134 | |
| 135 | static void vdma_nop(unsigned int dummy) |
| 136 | { |
| 137 | } |
| 138 | |
| 139 | |
| 140 | static int vdma_get_dma_residue(unsigned int dummy) |
| 141 | { |
| 142 | return virtual_dma_count + virtual_dma_residue; |
| 143 | } |
| 144 | |
| 145 | |
| 146 | static int fd_request_irq(void) |
| 147 | { |
| 148 | if(can_use_virtual_dma) |
| 149 | return request_irq(FLOPPY_IRQ, floppy_hardint,SA_INTERRUPT, |
| 150 | "floppy", NULL); |
| 151 | else |
| 152 | return request_irq(FLOPPY_IRQ, floppy_interrupt, |
| 153 | SA_INTERRUPT|SA_SAMPLE_RANDOM, |
| 154 | "floppy", NULL); |
| 155 | |
| 156 | } |
| 157 | |
| 158 | static unsigned long dma_mem_alloc(unsigned long size) |
| 159 | { |
| 160 | return __get_dma_pages(GFP_KERNEL,get_order(size)); |
| 161 | } |
| 162 | |
| 163 | |
| 164 | static unsigned long vdma_mem_alloc(unsigned long size) |
| 165 | { |
| 166 | return (unsigned long) vmalloc(size); |
| 167 | |
| 168 | } |
| 169 | |
| 170 | #define nodma_mem_alloc(size) vdma_mem_alloc(size) |
| 171 | |
| 172 | static void _fd_dma_mem_free(unsigned long addr, unsigned long size) |
| 173 | { |
| 174 | if((unsigned int) addr >= (unsigned int) high_memory) |
| 175 | return vfree((void *)addr); |
| 176 | else |
| 177 | free_pages(addr, get_order(size)); |
| 178 | } |
| 179 | |
| 180 | #define fd_dma_mem_free(addr, size) _fd_dma_mem_free(addr, size) |
| 181 | |
| 182 | static void _fd_chose_dma_mode(char *addr, unsigned long size) |
| 183 | { |
| 184 | if(can_use_virtual_dma == 2) { |
| 185 | if((unsigned int) addr >= (unsigned int) high_memory || |
| 186 | virt_to_bus(addr) >= 0x10000000) |
| 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 | |
| 198 | static 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 | |
| 209 | static 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 | |
| 218 | dma_cache_wback_inv(addr, size); |
| 219 | |
| 220 | /* actual, physical DMA */ |
| 221 | doing_pdma = 0; |
| 222 | clear_dma_ff(FLOPPY_DMA); |
| 223 | set_dma_mode(FLOPPY_DMA,mode); |
| 224 | set_dma_addr(FLOPPY_DMA,virt_to_bus(addr)); |
| 225 | set_dma_count(FLOPPY_DMA,size); |
| 226 | enable_dma(FLOPPY_DMA); |
| 227 | return 0; |
| 228 | } |
| 229 | |
| 230 | struct fd_routine_l { |
| 231 | int (*_request_dma)(unsigned int dmanr, const char * device_id); |
| 232 | void (*_free_dma)(unsigned int dmanr); |
| 233 | int (*_get_dma_residue)(unsigned int dummy); |
| 234 | unsigned long (*_dma_mem_alloc) (unsigned long size); |
| 235 | int (*_dma_setup)(char *addr, unsigned long size, int mode, int io); |
| 236 | } fd_routine[] = { |
| 237 | { |
| 238 | request_dma, |
| 239 | free_dma, |
| 240 | get_dma_residue, |
| 241 | dma_mem_alloc, |
| 242 | hard_dma_setup |
| 243 | }, |
| 244 | { |
| 245 | vdma_request_dma, |
| 246 | vdma_nop, |
| 247 | vdma_get_dma_residue, |
| 248 | vdma_mem_alloc, |
| 249 | vdma_dma_setup |
| 250 | } |
| 251 | }; |
| 252 | |
| 253 | |
| 254 | static int FDC1 = 0x3f0; |
| 255 | static int FDC2 = -1; |
| 256 | |
| 257 | /* |
| 258 | * Floppy types are stored in the rtc's CMOS RAM and so rtc_lock |
| 259 | * is needed to prevent corrupted CMOS RAM in case "insmod floppy" |
| 260 | * coincides with another rtc CMOS user. Paul G. |
| 261 | */ |
| 262 | #define FLOPPY0_TYPE (4) |
| 263 | #define FLOPPY1_TYPE (0) |
| 264 | |
| 265 | #define N_FDC 2 |
| 266 | #define N_DRIVE 8 |
| 267 | |
| 268 | #define FLOPPY_MOTOR_MASK 0xf0 |
| 269 | |
| 270 | #define AUTO_DMA |
| 271 | |
| 272 | #define EXTRA_FLOPPY_PARAMS |
| 273 | |
| 274 | #endif /* __ASM_SH_FLOPPY_H */ |