fs: use kmem_cache_zalloc instead
[pv_ops_mirror.git] / include / asm-x86 / floppy_64.h
blob6ea13c3806f3c70ae922731ac14c47375099d15e
1 /*
2 * Architecture specific parts of the Floppy driver
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.
8 * Copyright (C) 1995
9 */
10 #ifndef __ASM_X86_64_FLOPPY_H
11 #define __ASM_X86_64_FLOPPY_H
13 #include <linux/vmalloc.h>
17 * The DMA channel used by the floppy controller cannot access data at
18 * addresses >= 16MB
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.
24 #define _CROSS_64KB(a,s,vdma) \
25 (!(vdma) && ((unsigned long)(a)/K_64 != ((unsigned long)(a) + (s) - 1) / K_64))
27 #define CROSS_64KB(a,s) _CROSS_64KB(a,s,use_virtual_dma & 1)
30 #define SW fd_routine[use_virtual_dma&1]
31 #define CSW fd_routine[can_use_virtual_dma & 1]
34 #define fd_inb(port) inb_p(port)
35 #define fd_outb(value,port) outb_p(value,port)
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)
46 #define FLOPPY_CAN_FALLBACK_ON_NODMA
48 static int virtual_dma_count;
49 static int virtual_dma_residue;
50 static char *virtual_dma_addr;
51 static int virtual_dma_mode;
52 static int doing_pdma;
54 static irqreturn_t floppy_hardint(int irq, void *dev_id)
56 register unsigned char st;
58 #undef TRACE_FLPY_INT
60 #ifdef TRACE_FLPY_INT
61 static int calls=0;
62 static int bytes=0;
63 static int dma_wait=0;
64 #endif
65 if (!doing_pdma)
66 return floppy_interrupt(irq, dev_id);
68 #ifdef TRACE_FLPY_INT
69 if(!calls)
70 bytes = virtual_dma_count;
71 #endif
74 register int lcount;
75 register char *lptr;
77 st = 1;
78 for(lcount=virtual_dma_count, lptr=virtual_dma_addr;
79 lcount; lcount--, lptr++) {
80 st=inb(virtual_dma_port+4) & 0xa0 ;
81 if(st != 0xa0)
82 break;
83 if(virtual_dma_mode)
84 outb_p(*lptr, virtual_dma_port+5);
85 else
86 *lptr = inb_p(virtual_dma_port+5);
88 virtual_dma_count = lcount;
89 virtual_dma_addr = lptr;
90 st = inb(virtual_dma_port+4);
93 #ifdef TRACE_FLPY_INT
94 calls++;
95 #endif
96 if(st == 0x20)
97 return IRQ_HANDLED;
98 if(!(st & 0x20)) {
99 virtual_dma_residue += virtual_dma_count;
100 virtual_dma_count=0;
101 #ifdef TRACE_FLPY_INT
102 printk("count=%x, residue=%x calls=%d bytes=%d dma_wait=%d\n",
103 virtual_dma_count, virtual_dma_residue, calls, bytes,
104 dma_wait);
105 calls = 0;
106 dma_wait=0;
107 #endif
108 doing_pdma = 0;
109 floppy_interrupt(irq, dev_id);
110 return IRQ_HANDLED;
112 #ifdef TRACE_FLPY_INT
113 if(!virtual_dma_count)
114 dma_wait++;
115 #endif
116 return IRQ_HANDLED;
119 static void fd_disable_dma(void)
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;
128 static int vdma_request_dma(unsigned int dmanr, const char * device_id)
130 return 0;
133 static void vdma_nop(unsigned int dummy)
138 static int vdma_get_dma_residue(unsigned int dummy)
140 return virtual_dma_count + virtual_dma_residue;
144 static int fd_request_irq(void)
146 if(can_use_virtual_dma)
147 return request_irq(FLOPPY_IRQ, floppy_hardint,
148 IRQF_DISABLED, "floppy", NULL);
149 else
150 return request_irq(FLOPPY_IRQ, floppy_interrupt,
151 IRQF_DISABLED, "floppy", NULL);
154 static unsigned long dma_mem_alloc(unsigned long size)
156 return __get_dma_pages(GFP_KERNEL|__GFP_NORETRY,get_order(size));
160 static unsigned long vdma_mem_alloc(unsigned long size)
162 return (unsigned long) vmalloc(size);
166 #define nodma_mem_alloc(size) vdma_mem_alloc(size)
168 static void _fd_dma_mem_free(unsigned long addr, unsigned long size)
170 if((unsigned long) addr >= (unsigned long) high_memory)
171 vfree((void *)addr);
172 else
173 free_pages(addr, get_order(size));
176 #define fd_dma_mem_free(addr, size) _fd_dma_mem_free(addr, size)
178 static void _fd_chose_dma_mode(char *addr, unsigned long size)
180 if(can_use_virtual_dma == 2) {
181 if((unsigned long) addr >= (unsigned long) high_memory ||
182 isa_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;
192 #define fd_chose_dma_mode(addr, size) _fd_chose_dma_mode(addr, size)
195 static int vdma_dma_setup(char *addr, unsigned long size, int mode, int io)
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;
206 static int hard_dma_setup(char *addr, unsigned long size, int mode, int io)
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;
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,isa_virt_to_bus(addr));
219 set_dma_count(FLOPPY_DMA,size);
220 enable_dma(FLOPPY_DMA);
221 return 0;
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[] = {
232 request_dma,
233 free_dma,
234 get_dma_residue,
235 dma_mem_alloc,
236 hard_dma_setup
239 vdma_request_dma,
240 vdma_nop,
241 vdma_get_dma_residue,
242 vdma_mem_alloc,
243 vdma_dma_setup
248 static int FDC1 = 0x3f0;
249 static int FDC2 = -1;
252 * Floppy types are stored in the rtc's CMOS RAM and so rtc_lock
253 * is needed to prevent corrupted CMOS RAM in case "insmod floppy"
254 * coincides with another rtc CMOS user. Paul G.
256 #define FLOPPY0_TYPE ({ \
257 unsigned long flags; \
258 unsigned char val; \
259 spin_lock_irqsave(&rtc_lock, flags); \
260 val = (CMOS_READ(0x10) >> 4) & 15; \
261 spin_unlock_irqrestore(&rtc_lock, flags); \
262 val; \
265 #define FLOPPY1_TYPE ({ \
266 unsigned long flags; \
267 unsigned char val; \
268 spin_lock_irqsave(&rtc_lock, flags); \
269 val = CMOS_READ(0x10) & 15; \
270 spin_unlock_irqrestore(&rtc_lock, flags); \
271 val; \
274 #define N_FDC 2
275 #define N_DRIVE 8
277 #define FLOPPY_MOTOR_MASK 0xf0
279 #define AUTO_DMA
281 #define EXTRA_FLOPPY_PARAMS
283 #endif /* __ASM_X86_64_FLOPPY_H */