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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_FLOPPY_H
11#define _ASM_X86_FLOPPY_H
12
13#include <linux/sizes.h>
14#include <linux/vmalloc.h>
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) && \
26 ((unsigned long)(a) / SZ_64K != ((unsigned long)(a) + (s) - 1) / SZ_64K))
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) inb_p((base) + (reg))
33#define fd_outb(value, base, reg) outb_p(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
46static int virtual_dma_count;
47static int virtual_dma_residue;
48static char *virtual_dma_addr;
49static int virtual_dma_mode;
50static int doing_pdma;
51
52static irqreturn_t floppy_hardint(int irq, void *dev_id)
53{
54 unsigned char st;
55
56#undef TRACE_FLPY_INT
57
58#ifdef TRACE_FLPY_INT
59 static int calls;
60 static int bytes;
61 static int dma_wait;
62#endif
63 if (!doing_pdma)
64 return floppy_interrupt(irq, dev_id);
65
66#ifdef TRACE_FLPY_INT
67 if (!calls)
68 bytes = virtual_dma_count;
69#endif
70
71 {
72 int lcount;
73 char *lptr;
74
75 for (lcount = virtual_dma_count, lptr = virtual_dma_addr;
76 lcount; lcount--, lptr++) {
77 st = inb(virtual_dma_port + FD_STATUS);
78 st &= STATUS_DMA | STATUS_READY;
79 if (st != (STATUS_DMA | STATUS_READY))
80 break;
81 if (virtual_dma_mode)
82 outb_p(*lptr, virtual_dma_port + FD_DATA);
83 else
84 *lptr = inb_p(virtual_dma_port + FD_DATA);
85 }
86 virtual_dma_count = lcount;
87 virtual_dma_addr = lptr;
88 st = inb(virtual_dma_port + FD_STATUS);
89 }
90
91#ifdef TRACE_FLPY_INT
92 calls++;
93#endif
94 if (st == STATUS_DMA)
95 return IRQ_HANDLED;
96 if (!(st & STATUS_DMA)) {
97 virtual_dma_residue += virtual_dma_count;
98 virtual_dma_count = 0;
99#ifdef TRACE_FLPY_INT
100 printk(KERN_DEBUG "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);
108 return IRQ_HANDLED;
109 }
110#ifdef TRACE_FLPY_INT
111 if (!virtual_dma_count)
112 dma_wait++;
113#endif
114 return IRQ_HANDLED;
115}
116
117static void fd_disable_dma(void)
118{
119 if (!(can_use_virtual_dma & 1))
120 disable_dma(FLOPPY_DMA);
121 doing_pdma = 0;
122 virtual_dma_residue += virtual_dma_count;
123 virtual_dma_count = 0;
124}
125
126static int vdma_request_dma(unsigned int dmanr, const char *device_id)
127{
128 return 0;
129}
130
131static void vdma_nop(unsigned int dummy)
132{
133}
134
135
136static int vdma_get_dma_residue(unsigned int dummy)
137{
138 return virtual_dma_count + virtual_dma_residue;
139}
140
141
142static int fd_request_irq(void)
143{
144 if (can_use_virtual_dma)
145 return request_irq(FLOPPY_IRQ, floppy_hardint,
146 0, "floppy", NULL);
147 else
148 return request_irq(FLOPPY_IRQ, floppy_interrupt,
149 0, "floppy", NULL);
150}
151
152static unsigned long dma_mem_alloc(unsigned long size)
153{
154 return __get_dma_pages(GFP_KERNEL|__GFP_NORETRY, get_order(size));
155}
156
157
158static unsigned long vdma_mem_alloc(unsigned long size)
159{
160 return (unsigned long)vmalloc(size);
161
162}
163
164#define nodma_mem_alloc(size) vdma_mem_alloc(size)
165
166static void _fd_dma_mem_free(unsigned long addr, unsigned long size)
167{
168 if ((unsigned long)addr >= (unsigned long)high_memory)
169 vfree((void *)addr);
170 else
171 free_pages(addr, get_order(size));
172}
173
174#define fd_dma_mem_free(addr, size) _fd_dma_mem_free(addr, size)
175
176static void _fd_chose_dma_mode(char *addr, unsigned long size)
177{
178 if (can_use_virtual_dma == 2) {
179 if ((unsigned long)addr >= (unsigned long)high_memory ||
180 isa_virt_to_bus(addr) >= 0x1000000 ||
181 _CROSS_64KB(addr, size, 0))
182 use_virtual_dma = 1;
183 else
184 use_virtual_dma = 0;
185 } else {
186 use_virtual_dma = can_use_virtual_dma & 1;
187 }
188}
189
190#define fd_chose_dma_mode(addr, size) _fd_chose_dma_mode(addr, size)
191
192
193static int vdma_dma_setup(char *addr, unsigned long size, int mode, int io)
194{
195 doing_pdma = 1;
196 virtual_dma_port = io;
197 virtual_dma_mode = (mode == DMA_MODE_WRITE);
198 virtual_dma_addr = addr;
199 virtual_dma_count = size;
200 virtual_dma_residue = 0;
201 return 0;
202}
203
204static int hard_dma_setup(char *addr, unsigned long size, int mode, int io)
205{
206#ifdef FLOPPY_SANITY_CHECK
207 if (_CROSS_64KB(addr, size, use_virtual_dma & 1)) {
208 printk("DMA crossing 64-K boundary %p-%p\n", addr, addr+size);
209 return -1;
210 }
211#endif
212 /* actual, physical DMA */
213 doing_pdma = 0;
214 clear_dma_ff(FLOPPY_DMA);
215 set_dma_mode(FLOPPY_DMA, mode);
216 set_dma_addr(FLOPPY_DMA, isa_virt_to_bus(addr));
217 set_dma_count(FLOPPY_DMA, size);
218 enable_dma(FLOPPY_DMA);
219 return 0;
220}
221
222static struct fd_routine_l {
223 int (*_request_dma)(unsigned int dmanr, const char *device_id);
224 void (*_free_dma)(unsigned int dmanr);
225 int (*_get_dma_residue)(unsigned int dummy);
226 unsigned long (*_dma_mem_alloc)(unsigned long size);
227 int (*_dma_setup)(char *addr, unsigned long size, int mode, int io);
228} fd_routine[] = {
229 {
230 ._request_dma = request_dma,
231 ._free_dma = free_dma,
232 ._get_dma_residue = get_dma_residue,
233 ._dma_mem_alloc = dma_mem_alloc,
234 ._dma_setup = hard_dma_setup
235 },
236 {
237 ._request_dma = vdma_request_dma,
238 ._free_dma = vdma_nop,
239 ._get_dma_residue = vdma_get_dma_residue,
240 ._dma_mem_alloc = vdma_mem_alloc,
241 ._dma_setup = vdma_dma_setup
242 }
243};
244
245
246static int FDC1 = 0x3f0;
247static int FDC2 = -1;
248
249/*
250 * Floppy types are stored in the rtc's CMOS RAM and so rtc_lock
251 * is needed to prevent corrupted CMOS RAM in case "insmod floppy"
252 * coincides with another rtc CMOS user. Paul G.
253 */
254#define FLOPPY0_TYPE \
255({ \
256 unsigned long flags; \
257 unsigned char val; \
258 spin_lock_irqsave(&rtc_lock, flags); \
259 val = (CMOS_READ(0x10) >> 4) & 15; \
260 spin_unlock_irqrestore(&rtc_lock, flags); \
261 val; \
262})
263
264#define FLOPPY1_TYPE \
265({ \
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; \
272})
273
274#define N_FDC 2
275#define N_DRIVE 8
276
277#define EXTRA_FLOPPY_PARAMS
278
279#endif /* _ASM_X86_FLOPPY_H */
280

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source code of linux/arch/x86/include/asm/floppy.h