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/sizes.h> 12 #include <linux/vmalloc.h> 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) && \ 24 ((unsigned long)(a) / SZ_64K != ((unsigned long)(a) + (s) - 1) / SZ_64K)) 25 26 #define SW fd_routine[use_virtual_dma&1] 27 #define CSW fd_routine[can_use_virtual_dma & 1] 28 29 #define fd_inb(base, reg) readb((base) + (reg)) 30 #define fd_outb(value, base, reg) writeb(value, (base) + (reg)) 31 32 #define fd_request_dma() CSW._request_dma(FLOPPY_DMA,"floppy") 33 #define fd_free_dma() CSW._free_dma(FLOPPY_DMA) 34 #define fd_enable_irq() enable_irq(FLOPPY_IRQ) 35 #define fd_disable_irq() disable_irq(FLOPPY_IRQ) 36 #define fd_free_irq() free_irq(FLOPPY_IRQ, NULL) 37 #define fd_get_dma_residue() SW._get_dma_residue(FLOPPY_DMA) 38 #define fd_dma_mem_alloc(size) SW._dma_mem_alloc(size) 39 #define fd_dma_setup(addr, size, mode, io) SW._dma_setup(addr, size, mode, io) 40 41 #define FLOPPY_CAN_FALLBACK_ON_NODMA 42 43 static int virtual_dma_count=0; 44 static int virtual_dma_residue=0; 45 static char *virtual_dma_addr=0; 46 static int virtual_dma_mode=0; 47 static int doing_pdma=0; 48 49 static void floppy_hardint(int irq, void *dev_id, struct pt_regs * regs) 50 { 51 register unsigned char st; 52 53 #undef TRACE_FLPY_INT 54 55 #ifdef TRACE_FLPY_INT 56 static int calls=0; 57 static int bytes=0; 58 static int dma_wait=0; 59 #endif 60 if (!doing_pdma) { 61 floppy_interrupt(irq, dev_id, regs); 62 return; 63 } 64 65 #ifdef TRACE_FLPY_INT 66 if(!calls) 67 bytes = virtual_dma_count; 68 #endif 69 70 { 71 register int lcount; 72 register char *lptr = virtual_dma_addr; 73 74 for (lcount = virtual_dma_count; lcount; lcount--) { 75 st = fd_inb(virtual_dma_port, FD_STATUS); 76 st &= STATUS_DMA | STATUS_READY; 77 if (st != (STATUS_DMA | STATUS_READY)) 78 break; 79 if (virtual_dma_mode) { 80 fd_outb(*lptr, virtual_dma_port, FD_DATA); 81 } else { 82 *lptr = fd_inb(virtual_dma_port, FD_DATA); 83 } 84 lptr++; 85 } 86 virtual_dma_count = lcount; 87 virtual_dma_addr = lptr; 88 st = fd_inb(virtual_dma_port, FD_STATUS); 89 } 90 91 #ifdef TRACE_FLPY_INT 92 calls++; 93 #endif 94 if (st == STATUS_DMA) 95 return; 96 if (!(st & STATUS_DMA)) { 97 virtual_dma_residue += virtual_dma_count; 98 virtual_dma_count = 0; 99 #ifdef TRACE_FLPY_INT 100 printk("count=%x, residue=%x calls=%d bytes=%d dma_wait=%d\n", 101 virtual_dma_count, virtual_dma_residue, calls, bytes, 102 dma_wait); 103 calls = 0; 104 dma_wait=0; 105 #endif 106 doing_pdma = 0; 107 floppy_interrupt(irq, dev_id, regs); 108 return; 109 } 110 #ifdef TRACE_FLPY_INT 111 if (!virtual_dma_count) 112 dma_wait++; 113 #endif 114 } 115 116 static void fd_disable_dma(void) 117 { 118 if(! (can_use_virtual_dma & 1)) 119 disable_dma(FLOPPY_DMA); 120 doing_pdma = 0; 121 virtual_dma_residue += virtual_dma_count; 122 virtual_dma_count=0; 123 } 124 125 static int vdma_request_dma(unsigned int dmanr, const char * device_id) 126 { 127 return 0; 128 } 129 130 static void vdma_nop(unsigned int dummy) 131 { 132 } 133 134 135 static int vdma_get_dma_residue(unsigned int dummy) 136 { 137 return virtual_dma_count + virtual_dma_residue; 138 } 139 140 141 static int fd_request_irq(void) 142 { 143 if(can_use_virtual_dma) 144 return request_irq(FLOPPY_IRQ, floppy_hardint, 145 0, "floppy", NULL); 146 else 147 return request_irq(FLOPPY_IRQ, floppy_interrupt, 148 0, "floppy", NULL); 149 } 150 151 static unsigned long dma_mem_alloc(unsigned long size) 152 { 153 return __get_dma_pages(GFP_KERNEL, get_order(size)); 154 } 155 156 157 static unsigned long vdma_mem_alloc(unsigned long size) 158 { 159 return (unsigned long) vmalloc(size); 160 161 } 162 163 #define nodma_mem_alloc(size) vdma_mem_alloc(size) 164 165 static void _fd_dma_mem_free(unsigned long addr, unsigned long size) 166 { 167 if((unsigned int) addr >= (unsigned int) high_memory) 168 return vfree((void *)addr); 169 else 170 free_pages(addr, get_order(size)); 171 } 172 173 #define fd_dma_mem_free(addr, size) _fd_dma_mem_free(addr, size) 174 175 static void _fd_chose_dma_mode(char *addr, unsigned long size) 176 { 177 if(can_use_virtual_dma == 2) { 178 if((unsigned int) addr >= (unsigned int) high_memory || 179 virt_to_phys(addr) >= 0x1000000 || 180 _CROSS_64KB(addr, size, 0)) 181 use_virtual_dma = 1; 182 else 183 use_virtual_dma = 0; 184 } else { 185 use_virtual_dma = can_use_virtual_dma & 1; 186 } 187 } 188 189 #define fd_chose_dma_mode(addr, size) _fd_chose_dma_mode(addr, size) 190 191 192 static int vdma_dma_setup(char *addr, unsigned long size, int mode, int io) 193 { 194 doing_pdma = 1; 195 virtual_dma_port = io; 196 virtual_dma_mode = (mode == DMA_MODE_WRITE); 197 virtual_dma_addr = addr; 198 virtual_dma_count = size; 199 virtual_dma_residue = 0; 200 return 0; 201 } 202 203 static int hard_dma_setup(char *addr, unsigned long size, int mode, int io) 204 { 205 #ifdef FLOPPY_SANITY_CHECK 206 if (_CROSS_64KB(addr, size, use_virtual_dma & 1)) { 207 printk("DMA crossing 64-K boundary %p-%p\n", addr, addr+size); 208 return -1; 209 } 210 #endif 211 /* actual, physical DMA */ 212 doing_pdma = 0; 213 clear_dma_ff(FLOPPY_DMA); 214 set_dma_mode(FLOPPY_DMA,mode); 215 set_dma_addr(FLOPPY_DMA,virt_to_phys(addr)); 216 set_dma_count(FLOPPY_DMA,size); 217 enable_dma(FLOPPY_DMA); 218 return 0; 219 } 220 221 static struct fd_routine_l { 222 int (*_request_dma)(unsigned int dmanr, const char * device_id); 223 void (*_free_dma)(unsigned int dmanr); 224 int (*_get_dma_residue)(unsigned int dummy); 225 unsigned long (*_dma_mem_alloc) (unsigned long size); 226 int (*_dma_setup)(char *addr, unsigned long size, int mode, int io); 227 } fd_routine[] = { 228 { 229 request_dma, 230 free_dma, 231 get_dma_residue, 232 dma_mem_alloc, 233 hard_dma_setup 234 }, 235 { 236 vdma_request_dma, 237 vdma_nop, 238 vdma_get_dma_residue, 239 vdma_mem_alloc, 240 vdma_dma_setup 241 } 242 }; 243 244 245 static int FDC1 = 0x3f0; /* Lies. Floppy controller is memory mapped, not io mapped */ 246 static int FDC2 = -1; 247 248 #define FLOPPY0_TYPE 0 249 #define FLOPPY1_TYPE 0 250 251 #define N_FDC 1 252 #define N_DRIVE 8 253 254 #define EXTRA_FLOPPY_PARAMS 255 256 #endif /* __ASM_PARISC_FLOPPY_H */ 257