1 /* SPDX-License-Identifier: GPL-2.0-or-later */ 2 /* Architecture specific parts of the Floppy driver 3 * 4 * Linux/PA-RISC Project (http://www.parisc-linux.org/) 5 * Copyright (C) 2000 Matthew Wilcox (willy a debian . org) 6 * Copyright (C) 2000 Dave Kennedy 7 */ 8 #ifndef __ASM_PARISC_FLOPPY_H 9 #define __ASM_PARISC_FLOPPY_H 10 11 #include <linux/vmalloc.h> 12 13 14 /* 15 * The DMA channel used by the floppy controller cannot access data at 16 * addresses >= 16MB 17 * 18 * Went back to the 1MB limit, as some people had problems with the floppy 19 * driver otherwise. It doesn't matter much for performance anyway, as most 20 * floppy accesses go through the track buffer. 21 */ 22 #define _CROSS_64KB(a,s,vdma) \ 23 (!(vdma) && ((unsigned long)(a)/K_64 != ((unsigned long)(a) + (s) - 1) / K_64)) 24 25 #define CROSS_64KB(a,s) _CROSS_64KB(a,s,use_virtual_dma & 1) 26 27 28 #define SW fd_routine[use_virtual_dma&1] 29 #define CSW fd_routine[can_use_virtual_dma & 1] 30 31 32 #define fd_inb(base, reg) readb((base) + (reg)) 33 #define fd_outb(value, base, reg) writeb(value, (base) + (reg)) 34 35 #define fd_request_dma() CSW._request_dma(FLOPPY_DMA,"floppy") 36 #define fd_free_dma() CSW._free_dma(FLOPPY_DMA) 37 #define fd_enable_irq() enable_irq(FLOPPY_IRQ) 38 #define fd_disable_irq() disable_irq(FLOPPY_IRQ) 39 #define fd_free_irq() free_irq(FLOPPY_IRQ, NULL) 40 #define fd_get_dma_residue() SW._get_dma_residue(FLOPPY_DMA) 41 #define fd_dma_mem_alloc(size) SW._dma_mem_alloc(size) 42 #define fd_dma_setup(addr, size, mode, io) SW._dma_setup(addr, size, mode, io) 43 44 #define FLOPPY_CAN_FALLBACK_ON_NODMA 45 46 static int virtual_dma_count=0; 47 static int virtual_dma_residue=0; 48 static char *virtual_dma_addr=0; 49 static int virtual_dma_mode=0; 50 static int doing_pdma=0; 51 52 static void floppy_hardint(int irq, void *dev_id, struct pt_regs * regs) 53 { 54 register unsigned char st; 55 56 #undef TRACE_FLPY_INT 57 58 #ifdef TRACE_FLPY_INT 59 static int calls=0; 60 static int bytes=0; 61 static int dma_wait=0; 62 #endif 63 if (!doing_pdma) { 64 floppy_interrupt(irq, dev_id, regs); 65 return; 66 } 67 68 #ifdef TRACE_FLPY_INT 69 if(!calls) 70 bytes = virtual_dma_count; 71 #endif 72 73 { 74 register int lcount; 75 register char *lptr = virtual_dma_addr; 76 77 for (lcount = virtual_dma_count; lcount; lcount--) { 78 st = fd_inb(virtual_dma_port, FD_STATUS); 79 st &= STATUS_DMA | STATUS_READY; 80 if (st != (STATUS_DMA | STATUS_READY)) 81 break; 82 if (virtual_dma_mode) { 83 fd_outb(*lptr, virtual_dma_port, FD_DATA); 84 } else { 85 *lptr = fd_inb(virtual_dma_port, FD_DATA); 86 } 87 lptr++; 88 } 89 virtual_dma_count = lcount; 90 virtual_dma_addr = lptr; 91 st = fd_inb(virtual_dma_port, FD_STATUS); 92 } 93 94 #ifdef TRACE_FLPY_INT 95 calls++; 96 #endif 97 if (st == STATUS_DMA) 98 return; 99 if (!(st & STATUS_DMA)) { 100 virtual_dma_residue += virtual_dma_count; 101 virtual_dma_count = 0; 102 #ifdef TRACE_FLPY_INT 103 printk("count=%x, residue=%x calls=%d bytes=%d dma_wait=%d\n", 104 virtual_dma_count, virtual_dma_residue, calls, bytes, 105 dma_wait); 106 calls = 0; 107 dma_wait=0; 108 #endif 109 doing_pdma = 0; 110 floppy_interrupt(irq, dev_id, regs); 111 return; 112 } 113 #ifdef TRACE_FLPY_INT 114 if (!virtual_dma_count) 115 dma_wait++; 116 #endif 117 } 118 119 static void fd_disable_dma(void) 120 { 121 if(! (can_use_virtual_dma & 1)) 122 disable_dma(FLOPPY_DMA); 123 doing_pdma = 0; 124 virtual_dma_residue += virtual_dma_count; 125 virtual_dma_count=0; 126 } 127 128 static int vdma_request_dma(unsigned int dmanr, const char * device_id) 129 { 130 return 0; 131 } 132 133 static void vdma_nop(unsigned int dummy) 134 { 135 } 136 137 138 static int vdma_get_dma_residue(unsigned int dummy) 139 { 140 return virtual_dma_count + virtual_dma_residue; 141 } 142 143 144 static int fd_request_irq(void) 145 { 146 if(can_use_virtual_dma) 147 return request_irq(FLOPPY_IRQ, floppy_hardint, 148 0, "floppy", NULL); 149 else 150 return request_irq(FLOPPY_IRQ, floppy_interrupt, 151 0, "floppy", NULL); 152 } 153 154 static unsigned long dma_mem_alloc(unsigned long size) 155 { 156 return __get_dma_pages(GFP_KERNEL, get_order(size)); 157 } 158 159 160 static unsigned long vdma_mem_alloc(unsigned long size) 161 { 162 return (unsigned long) vmalloc(size); 163 164 } 165 166 #define nodma_mem_alloc(size) vdma_mem_alloc(size) 167 168 static void _fd_dma_mem_free(unsigned long addr, unsigned long size) 169 { 170 if((unsigned int) addr >= (unsigned int) high_memory) 171 return vfree((void *)addr); 172 else 173 free_pages(addr, get_order(size)); 174 } 175 176 #define fd_dma_mem_free(addr, size) _fd_dma_mem_free(addr, size) 177 178 static void _fd_chose_dma_mode(char *addr, unsigned long size) 179 { 180 if(can_use_virtual_dma == 2) { 181 if((unsigned int) addr >= (unsigned int) high_memory || 182 virt_to_bus(addr) >= 0x1000000 || 183 _CROSS_64KB(addr, size, 0)) 184 use_virtual_dma = 1; 185 else 186 use_virtual_dma = 0; 187 } else { 188 use_virtual_dma = can_use_virtual_dma & 1; 189 } 190 } 191 192 #define fd_chose_dma_mode(addr, size) _fd_chose_dma_mode(addr, size) 193 194 195 static int vdma_dma_setup(char *addr, unsigned long size, int mode, int io) 196 { 197 doing_pdma = 1; 198 virtual_dma_port = io; 199 virtual_dma_mode = (mode == DMA_MODE_WRITE); 200 virtual_dma_addr = addr; 201 virtual_dma_count = size; 202 virtual_dma_residue = 0; 203 return 0; 204 } 205 206 static int hard_dma_setup(char *addr, unsigned long size, int mode, int io) 207 { 208 #ifdef FLOPPY_SANITY_CHECK 209 if (CROSS_64KB(addr, size)) { 210 printk("DMA crossing 64-K boundary %p-%p\n", addr, addr+size); 211 return -1; 212 } 213 #endif 214 /* actual, physical DMA */ 215 doing_pdma = 0; 216 clear_dma_ff(FLOPPY_DMA); 217 set_dma_mode(FLOPPY_DMA,mode); 218 set_dma_addr(FLOPPY_DMA,virt_to_bus(addr)); 219 set_dma_count(FLOPPY_DMA,size); 220 enable_dma(FLOPPY_DMA); 221 return 0; 222 } 223 224 static struct fd_routine_l { 225 int (*_request_dma)(unsigned int dmanr, const char * device_id); 226 void (*_free_dma)(unsigned int dmanr); 227 int (*_get_dma_residue)(unsigned int dummy); 228 unsigned long (*_dma_mem_alloc) (unsigned long size); 229 int (*_dma_setup)(char *addr, unsigned long size, int mode, int io); 230 } fd_routine[] = { 231 { 232 request_dma, 233 free_dma, 234 get_dma_residue, 235 dma_mem_alloc, 236 hard_dma_setup 237 }, 238 { 239 vdma_request_dma, 240 vdma_nop, 241 vdma_get_dma_residue, 242 vdma_mem_alloc, 243 vdma_dma_setup 244 } 245 }; 246 247 248 static int FDC1 = 0x3f0; /* Lies. Floppy controller is memory mapped, not io mapped */ 249 static int FDC2 = -1; 250 251 #define FLOPPY0_TYPE 0 252 #define FLOPPY1_TYPE 0 253 254 #define N_FDC 1 255 #define N_DRIVE 8 256 257 #define EXTRA_FLOPPY_PARAMS 258 259 #endif /* __ASM_PARISC_FLOPPY_H */ 260