1 /* Architecture specific parts of the Floppy driver 2 * 3 * Linux/PA-RISC Project (http://www.parisc-linux.org/) 4 * Copyright (C) 2000 Matthew Wilcox (willy a debian . org) 5 * Copyright (C) 2000 Dave Kennedy 6 * 7 * This program is free software; you can redistribute it and/or modify 8 * it under the terms of the GNU General Public License as published by 9 * the Free Software Foundation; either version 2 of the License, or 10 * (at your option) any later version. 11 * 12 * This program is distributed in the hope that it will be useful, 13 * but WITHOUT ANY WARRANTY; without even the implied warranty of 14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 15 * GNU General Public License for more details. 16 * 17 * You should have received a copy of the GNU General Public License 18 * along with this program; if not, write to the Free Software 19 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA 20 */ 21 #ifndef __ASM_PARISC_FLOPPY_H 22 #define __ASM_PARISC_FLOPPY_H 23 24 #include <linux/vmalloc.h> 25 26 27 /* 28 * The DMA channel used by the floppy controller cannot access data at 29 * addresses >= 16MB 30 * 31 * Went back to the 1MB limit, as some people had problems with the floppy 32 * driver otherwise. It doesn't matter much for performance anyway, as most 33 * floppy accesses go through the track buffer. 34 */ 35 #define _CROSS_64KB(a,s,vdma) \ 36 (!vdma && ((unsigned long)(a)/K_64 != ((unsigned long)(a) + (s) - 1) / K_64)) 37 38 #define CROSS_64KB(a,s) _CROSS_64KB(a,s,use_virtual_dma & 1) 39 40 41 #define SW fd_routine[use_virtual_dma&1] 42 #define CSW fd_routine[can_use_virtual_dma & 1] 43 44 45 #define fd_inb(port) readb(port) 46 #define fd_outb(value, port) writeb(value, port) 47 48 #define fd_request_dma() CSW._request_dma(FLOPPY_DMA,"floppy") 49 #define fd_free_dma() CSW._free_dma(FLOPPY_DMA) 50 #define fd_enable_irq() enable_irq(FLOPPY_IRQ) 51 #define fd_disable_irq() disable_irq(FLOPPY_IRQ) 52 #define fd_free_irq() free_irq(FLOPPY_IRQ, NULL) 53 #define fd_get_dma_residue() SW._get_dma_residue(FLOPPY_DMA) 54 #define fd_dma_mem_alloc(size) SW._dma_mem_alloc(size) 55 #define fd_dma_setup(addr, size, mode, io) SW._dma_setup(addr, size, mode, io) 56 57 #define FLOPPY_CAN_FALLBACK_ON_NODMA 58 59 static int virtual_dma_count=0; 60 static int virtual_dma_residue=0; 61 static char *virtual_dma_addr=0; 62 static int virtual_dma_mode=0; 63 static int doing_pdma=0; 64 65 static void floppy_hardint(int irq, void *dev_id, struct pt_regs * regs) 66 { 67 register unsigned char st; 68 69 #undef TRACE_FLPY_INT 70 71 #ifdef TRACE_FLPY_INT 72 static int calls=0; 73 static int bytes=0; 74 static int dma_wait=0; 75 #endif 76 if (!doing_pdma) { 77 floppy_interrupt(irq, dev_id, regs); 78 return; 79 } 80 81 #ifdef TRACE_FLPY_INT 82 if(!calls) 83 bytes = virtual_dma_count; 84 #endif 85 86 { 87 register int lcount; 88 register char *lptr = virtual_dma_addr; 89 90 for (lcount = virtual_dma_count; lcount; lcount--) { 91 st = fd_inb(virtual_dma_port+4) & 0xa0 ; 92 if (st != 0xa0) 93 break; 94 if (virtual_dma_mode) { 95 fd_outb(*lptr, virtual_dma_port+5); 96 } else { 97 *lptr = fd_inb(virtual_dma_port+5); 98 } 99 lptr++; 100 } 101 virtual_dma_count = lcount; 102 virtual_dma_addr = lptr; 103 st = fd_inb(virtual_dma_port+4); 104 } 105 106 #ifdef TRACE_FLPY_INT 107 calls++; 108 #endif 109 if (st == 0x20) 110 return; 111 if (!(st & 0x20)) { 112 virtual_dma_residue += virtual_dma_count; 113 virtual_dma_count = 0; 114 #ifdef TRACE_FLPY_INT 115 printk("count=%x, residue=%x calls=%d bytes=%d dma_wait=%d\n", 116 virtual_dma_count, virtual_dma_residue, calls, bytes, 117 dma_wait); 118 calls = 0; 119 dma_wait=0; 120 #endif 121 doing_pdma = 0; 122 floppy_interrupt(irq, dev_id, regs); 123 return; 124 } 125 #ifdef TRACE_FLPY_INT 126 if (!virtual_dma_count) 127 dma_wait++; 128 #endif 129 } 130 131 static void fd_disable_dma(void) 132 { 133 if(! (can_use_virtual_dma & 1)) 134 disable_dma(FLOPPY_DMA); 135 doing_pdma = 0; 136 virtual_dma_residue += virtual_dma_count; 137 virtual_dma_count=0; 138 } 139 140 static int vdma_request_dma(unsigned int dmanr, const char * device_id) 141 { 142 return 0; 143 } 144 145 static void vdma_nop(unsigned int dummy) 146 { 147 } 148 149 150 static int vdma_get_dma_residue(unsigned int dummy) 151 { 152 return virtual_dma_count + virtual_dma_residue; 153 } 154 155 156 static int fd_request_irq(void) 157 { 158 if(can_use_virtual_dma) 159 return request_irq(FLOPPY_IRQ, floppy_hardint, 160 IRQF_DISABLED, "floppy", NULL); 161 else 162 return request_irq(FLOPPY_IRQ, floppy_interrupt, 163 IRQF_DISABLED, "floppy", NULL); 164 } 165 166 static unsigned long dma_mem_alloc(unsigned long size) 167 { 168 return __get_dma_pages(GFP_KERNEL, get_order(size)); 169 } 170 171 172 static unsigned long vdma_mem_alloc(unsigned long size) 173 { 174 return (unsigned long) vmalloc(size); 175 176 } 177 178 #define nodma_mem_alloc(size) vdma_mem_alloc(size) 179 180 static void _fd_dma_mem_free(unsigned long addr, unsigned long size) 181 { 182 if((unsigned int) addr >= (unsigned int) high_memory) 183 return vfree((void *)addr); 184 else 185 free_pages(addr, get_order(size)); 186 } 187 188 #define fd_dma_mem_free(addr, size) _fd_dma_mem_free(addr, size) 189 190 static void _fd_chose_dma_mode(char *addr, unsigned long size) 191 { 192 if(can_use_virtual_dma == 2) { 193 if((unsigned int) addr >= (unsigned int) high_memory || 194 virt_to_bus(addr) >= 0x1000000 || 195 _CROSS_64KB(addr, size, 0)) 196 use_virtual_dma = 1; 197 else 198 use_virtual_dma = 0; 199 } else { 200 use_virtual_dma = can_use_virtual_dma & 1; 201 } 202 } 203 204 #define fd_chose_dma_mode(addr, size) _fd_chose_dma_mode(addr, size) 205 206 207 static int vdma_dma_setup(char *addr, unsigned long size, int mode, int io) 208 { 209 doing_pdma = 1; 210 virtual_dma_port = io; 211 virtual_dma_mode = (mode == DMA_MODE_WRITE); 212 virtual_dma_addr = addr; 213 virtual_dma_count = size; 214 virtual_dma_residue = 0; 215 return 0; 216 } 217 218 static int hard_dma_setup(char *addr, unsigned long size, int mode, int io) 219 { 220 #ifdef FLOPPY_SANITY_CHECK 221 if (CROSS_64KB(addr, size)) { 222 printk("DMA crossing 64-K boundary %p-%p\n", addr, addr+size); 223 return -1; 224 } 225 #endif 226 /* actual, physical DMA */ 227 doing_pdma = 0; 228 clear_dma_ff(FLOPPY_DMA); 229 set_dma_mode(FLOPPY_DMA,mode); 230 set_dma_addr(FLOPPY_DMA,virt_to_bus(addr)); 231 set_dma_count(FLOPPY_DMA,size); 232 enable_dma(FLOPPY_DMA); 233 return 0; 234 } 235 236 static struct fd_routine_l { 237 int (*_request_dma)(unsigned int dmanr, const char * device_id); 238 void (*_free_dma)(unsigned int dmanr); 239 int (*_get_dma_residue)(unsigned int dummy); 240 unsigned long (*_dma_mem_alloc) (unsigned long size); 241 int (*_dma_setup)(char *addr, unsigned long size, int mode, int io); 242 } fd_routine[] = { 243 { 244 request_dma, 245 free_dma, 246 get_dma_residue, 247 dma_mem_alloc, 248 hard_dma_setup 249 }, 250 { 251 vdma_request_dma, 252 vdma_nop, 253 vdma_get_dma_residue, 254 vdma_mem_alloc, 255 vdma_dma_setup 256 } 257 }; 258 259 260 static int FDC1 = 0x3f0; /* Lies. Floppy controller is memory mapped, not io mapped */ 261 static int FDC2 = -1; 262 263 #define FLOPPY0_TYPE 0 264 #define FLOPPY1_TYPE 0 265 266 #define N_FDC 1 267 #define N_DRIVE 8 268 269 #define EXTRA_FLOPPY_PARAMS 270 271 #endif /* __ASM_PARISC_FLOPPY_H */ 272