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_X86_64_FLOPPY_H
11 #define __ASM_X86_64_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
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;
53
floppy_hardint(int irq,void * dev_id,struct pt_regs * regs)54 static 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
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 floppy_interrupt(irq, dev_id, regs);
67 return;
68 }
69
70 #ifdef TRACE_FLPY_INT
71 if(!calls)
72 bytes = virtual_dma_count;
73 #endif
74
75 {
76 register int lcount;
77 register char *lptr;
78
79 st = 1;
80 for(lcount=virtual_dma_count, lptr=virtual_dma_addr;
81 lcount; lcount--, lptr++) {
82 st=inb(virtual_dma_port+4) & 0xa0 ;
83 if(st != 0xa0)
84 break;
85 if(virtual_dma_mode)
86 outb_p(*lptr, virtual_dma_port+5);
87 else
88 *lptr = inb_p(virtual_dma_port+5);
89 }
90 virtual_dma_count = lcount;
91 virtual_dma_addr = lptr;
92 st = inb(virtual_dma_port+4);
93 }
94
95 #ifdef TRACE_FLPY_INT
96 calls++;
97 #endif
98 if(st == 0x20)
99 return;
100 if(!(st & 0x20)) {
101 virtual_dma_residue += virtual_dma_count;
102 virtual_dma_count=0;
103 #ifdef TRACE_FLPY_INT
104 printk("count=%x, residue=%x calls=%d bytes=%d dma_wait=%d\n",
105 virtual_dma_count, virtual_dma_residue, calls, bytes,
106 dma_wait);
107 calls = 0;
108 dma_wait=0;
109 #endif
110 doing_pdma = 0;
111 floppy_interrupt(irq, dev_id, regs);
112 return;
113 }
114 #ifdef TRACE_FLPY_INT
115 if(!virtual_dma_count)
116 dma_wait++;
117 #endif
118 }
119
fd_disable_dma(void)120 static void fd_disable_dma(void)
121 {
122 if(! (can_use_virtual_dma & 1))
123 disable_dma(FLOPPY_DMA);
124 doing_pdma = 0;
125 virtual_dma_residue += virtual_dma_count;
126 virtual_dma_count=0;
127 }
128
vdma_request_dma(unsigned int dmanr,const char * device_id)129 static int vdma_request_dma(unsigned int dmanr, const char * device_id)
130 {
131 return 0;
132 }
133
vdma_nop(unsigned int dummy)134 static void vdma_nop(unsigned int dummy)
135 {
136 }
137
138
vdma_get_dma_residue(unsigned int dummy)139 static int vdma_get_dma_residue(unsigned int dummy)
140 {
141 return virtual_dma_count + virtual_dma_residue;
142 }
143
144
fd_request_irq(void)145 static int fd_request_irq(void)
146 {
147 if(can_use_virtual_dma)
148 return request_irq(FLOPPY_IRQ, floppy_hardint,SA_INTERRUPT,
149 "floppy", NULL);
150 else
151 return request_irq(FLOPPY_IRQ, floppy_interrupt,
152 SA_INTERRUPT|SA_SAMPLE_RANDOM,
153 "floppy", NULL);
154
155 }
156
dma_mem_alloc(unsigned long size)157 static unsigned long dma_mem_alloc(unsigned long size)
158 {
159 return __get_dma_pages(GFP_KERNEL,get_order(size));
160 }
161
162
vdma_mem_alloc(unsigned long size)163 static unsigned long vdma_mem_alloc(unsigned long size)
164 {
165 return (unsigned long) vmalloc(size);
166
167 }
168
169 #define nodma_mem_alloc(size) vdma_mem_alloc(size)
170
_fd_dma_mem_free(unsigned long addr,unsigned long size)171 static void _fd_dma_mem_free(unsigned long addr, unsigned long size)
172 {
173 if((unsigned long) addr >= (unsigned long) high_memory)
174 return vfree((void *)addr);
175 else
176 free_pages(addr, get_order(size));
177 }
178
179 #define fd_dma_mem_free(addr, size) _fd_dma_mem_free(addr, size)
180
_fd_chose_dma_mode(char * addr,unsigned long size)181 static void _fd_chose_dma_mode(char *addr, unsigned long size)
182 {
183 if(can_use_virtual_dma == 2) {
184 if((unsigned long) addr >= (unsigned long) high_memory ||
185 virt_to_bus(addr) >= 0x1000000 ||
186 _CROSS_64KB(addr, size, 0))
187 use_virtual_dma = 1;
188 else
189 use_virtual_dma = 0;
190 } else {
191 use_virtual_dma = can_use_virtual_dma & 1;
192 }
193 }
194
195 #define fd_chose_dma_mode(addr, size) _fd_chose_dma_mode(addr, size)
196
197
vdma_dma_setup(char * addr,unsigned long size,int mode,int io)198 static int vdma_dma_setup(char *addr, unsigned long size, int mode, int io)
199 {
200 doing_pdma = 1;
201 virtual_dma_port = io;
202 virtual_dma_mode = (mode == DMA_MODE_WRITE);
203 virtual_dma_addr = addr;
204 virtual_dma_count = size;
205 virtual_dma_residue = 0;
206 return 0;
207 }
208
hard_dma_setup(char * addr,unsigned long size,int mode,int io)209 static int hard_dma_setup(char *addr, unsigned long size, int mode, int io)
210 {
211 #ifdef FLOPPY_SANITY_CHECK
212 if (CROSS_64KB(addr, size)) {
213 printk("DMA crossing 64-K boundary %p-%p\n", addr, addr+size);
214 return -1;
215 }
216 #endif
217 /* actual, physical DMA */
218 doing_pdma = 0;
219 clear_dma_ff(FLOPPY_DMA);
220 set_dma_mode(FLOPPY_DMA,mode);
221 set_dma_addr(FLOPPY_DMA,virt_to_bus(addr));
222 set_dma_count(FLOPPY_DMA,size);
223 enable_dma(FLOPPY_DMA);
224 return 0;
225 }
226
227 struct fd_routine_l {
228 int (*_request_dma)(unsigned int dmanr, const char * device_id);
229 void (*_free_dma)(unsigned int dmanr);
230 int (*_get_dma_residue)(unsigned int dummy);
231 unsigned long (*_dma_mem_alloc) (unsigned long size);
232 int (*_dma_setup)(char *addr, unsigned long size, int mode, int io);
233 } fd_routine[] = {
234 {
235 request_dma,
236 free_dma,
237 get_dma_residue,
238 dma_mem_alloc,
239 hard_dma_setup
240 },
241 {
242 vdma_request_dma,
243 vdma_nop,
244 vdma_get_dma_residue,
245 vdma_mem_alloc,
246 vdma_dma_setup
247 }
248 };
249
250
251 static int FDC1 = 0x3f0;
252 static int FDC2 = -1;
253
254 /*
255 * Floppy types are stored in the rtc's CMOS RAM and so rtc_lock
256 * is needed to prevent corrupted CMOS RAM in case "insmod floppy"
257 * coincides with another rtc CMOS user. Paul G.
258 */
259 #define FLOPPY0_TYPE ({ \
260 unsigned long flags; \
261 unsigned char val; \
262 spin_lock_irqsave(&rtc_lock, flags); \
263 val = (CMOS_READ(0x10) >> 4) & 15; \
264 spin_unlock_irqrestore(&rtc_lock, flags); \
265 val; \
266 })
267
268 #define FLOPPY1_TYPE ({ \
269 unsigned long flags; \
270 unsigned char val; \
271 spin_lock_irqsave(&rtc_lock, flags); \
272 val = CMOS_READ(0x10) & 15; \
273 spin_unlock_irqrestore(&rtc_lock, flags); \
274 val; \
275 })
276
277 #define N_FDC 2
278 #define N_DRIVE 8
279
280 #define FLOPPY_MOTOR_MASK 0xf0
281
282 #define AUTO_DMA
283
284 #define EXTRA_FLOPPY_PARAMS
285
286 #endif /* __ASM_X86_64_FLOPPY_H */
287