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_PARISC_FLOPPY_H 11#define __ASM_PARISC_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=0; 49static int virtual_dma_residue=0; 50static char *virtual_dma_addr=0; 51static int virtual_dma_mode=0; 52static int doing_pdma=0; 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#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 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 121static 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 130static int vdma_request_dma(unsigned int dmanr, const char * device_id) 131{ 132 return 0; 133} 134 135static void vdma_nop(unsigned int dummy) 136{ 137} 138 139 140static int vdma_get_dma_residue(unsigned int dummy) 141{ 142 return virtual_dma_count + virtual_dma_residue; 143} 144 145 146static 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 158static unsigned long dma_mem_alloc(unsigned long size) 159{ 160 return __get_dma_pages(GFP_KERNEL,__get_order(size)); 161} 162 163 164static 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 172static 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 182static 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) >= 0x1000000 || 187 _CROSS_64KB(addr, size, 0)) 188 use_virtual_dma = 1; 189 else 190 use_virtual_dma = 0; 191 } else { 192 use_virtual_dma = can_use_virtual_dma & 1; 193 } 194} 195 196#define fd_chose_dma_mode(addr, size) _fd_chose_dma_mode(addr, size) 197 198 199static int vdma_dma_setup(char *addr, unsigned long size, int mode, int io) 200{ 201 doing_pdma = 1; 202 virtual_dma_port = io; 203 virtual_dma_mode = (mode == DMA_MODE_WRITE); 204 virtual_dma_addr = addr; 205 virtual_dma_count = size; 206 virtual_dma_residue = 0; 207 return 0; 208} 209 210static int hard_dma_setup(char *addr, unsigned long size, int mode, int io) 211{ 212#ifdef FLOPPY_SANITY_CHECK 213 if (CROSS_64KB(addr, size)) { 214 printk("DMA crossing 64-K boundary %p-%p\n", addr, addr+size); 215 return -1; 216 } 217#endif 218 /* actual, physical DMA */ 219 doing_pdma = 0; 220 clear_dma_ff(FLOPPY_DMA); 221 set_dma_mode(FLOPPY_DMA,mode); 222 set_dma_addr(FLOPPY_DMA,virt_to_bus(addr)); 223 set_dma_count(FLOPPY_DMA,size); 224 enable_dma(FLOPPY_DMA); 225 return 0; 226} 227 228struct fd_routine_l { 229 int (*_request_dma)(unsigned int dmanr, const char * device_id); 230 void (*_free_dma)(unsigned int dmanr); 231 int (*_get_dma_residue)(unsigned int dummy); 232 unsigned long (*_dma_mem_alloc) (unsigned long size); 233 int (*_dma_setup)(char *addr, unsigned long size, int mode, int io); 234} fd_routine[] = { 235 { 236 request_dma, 237 free_dma, 238 get_dma_residue, 239 dma_mem_alloc, 240 hard_dma_setup 241 }, 242 { 243 vdma_request_dma, 244 vdma_nop, 245 vdma_get_dma_residue, 246 vdma_mem_alloc, 247 vdma_dma_setup 248 } 249}; 250 251 252static int FDC1 = 0x3f0; 253static int FDC2 = -1; 254 255#define FLOPPY0_TYPE ((CMOS_READ(0x10) >> 4) & 15) 256#define FLOPPY1_TYPE (CMOS_READ(0x10) & 15) 257 258#define N_FDC 1 259#define N_DRIVE 8 260 261#define FLOPPY_MOTOR_MASK 0xf0 262 263#define AUTO_DMA 264 265 266#endif /* __ASM_PARISC_FLOPPY_H */ 267