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/vmalloc.h>
14
15 /*
16 * The DMA channel used by the floppy controller cannot access data at
17 * addresses >= 16MB
18 *
19 * Went back to the 1MB limit, as some people had problems with the floppy
20 * driver otherwise. It doesn't matter much for performance anyway, as most
21 * floppy accesses go through the track buffer.
22 */
23 #define _CROSS_64KB(a, s, vdma) \
24 (!(vdma) && \
25 ((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(base, reg) inb_p((base) + (reg))
35 #define fd_outb(value, base, reg) outb_p(value, (base) + (reg))
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
54 static irqreturn_t floppy_hardint(int irq, void *dev_id)
55 {
56 unsigned char st;
57
58 #undef TRACE_FLPY_INT
59
60 #ifdef TRACE_FLPY_INT
61 static int calls;
62 static int bytes;
63 static int dma_wait;
64 #endif
65 if (!doing_pdma)
66 return floppy_interrupt(irq, dev_id);
67
68 #ifdef TRACE_FLPY_INT
69 if (!calls)
70 bytes = virtual_dma_count;
71 #endif
72
73 {
74 int lcount;
75 char *lptr;
76
77 for (lcount = virtual_dma_count, lptr = virtual_dma_addr;
78 lcount; lcount--, lptr++) {
79 st = inb(virtual_dma_port + FD_STATUS);
80 st &= STATUS_DMA | STATUS_READY;
81 if (st != (STATUS_DMA | STATUS_READY))
82 break;
83 if (virtual_dma_mode)
84 outb_p(*lptr, virtual_dma_port + FD_DATA);
85 else
86 *lptr = inb_p(virtual_dma_port + FD_DATA);
87 }
88 virtual_dma_count = lcount;
89 virtual_dma_addr = lptr;
90 st = inb(virtual_dma_port + FD_STATUS);
91 }
92
93 #ifdef TRACE_FLPY_INT
94 calls++;
95 #endif
96 if (st == STATUS_DMA)
97 return IRQ_HANDLED;
98 if (!(st & STATUS_DMA)) {
99 virtual_dma_residue += virtual_dma_count;
100 virtual_dma_count = 0;
101 #ifdef TRACE_FLPY_INT
102 printk(KERN_DEBUG "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;
111 }
112 #ifdef TRACE_FLPY_INT
113 if (!virtual_dma_count)
114 dma_wait++;
115 #endif
116 return IRQ_HANDLED;
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|__GFP_NORETRY, 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 long)addr >= (unsigned long)high_memory)
171 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 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;
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, isa_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 = request_dma,
233 ._free_dma = free_dma,
234 ._get_dma_residue = get_dma_residue,
235 ._dma_mem_alloc = dma_mem_alloc,
236 ._dma_setup = hard_dma_setup
237 },
238 {
239 ._request_dma = vdma_request_dma,
240 ._free_dma = vdma_nop,
241 ._get_dma_residue = vdma_get_dma_residue,
242 ._dma_mem_alloc = vdma_mem_alloc,
243 ._dma_setup = vdma_dma_setup
244 }
245 };
246
247
248 static int FDC1 = 0x3f0;
249 static int FDC2 = -1;
250
251 /*
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.
255 */
256 #define FLOPPY0_TYPE \
257 ({ \
258 unsigned long flags; \
259 unsigned char val; \
260 spin_lock_irqsave(&rtc_lock, flags); \
261 val = (CMOS_READ(0x10) >> 4) & 15; \
262 spin_unlock_irqrestore(&rtc_lock, flags); \
263 val; \
264 })
265
266 #define FLOPPY1_TYPE \
267 ({ \
268 unsigned long flags; \
269 unsigned char val; \
270 spin_lock_irqsave(&rtc_lock, flags); \
271 val = CMOS_READ(0x10) & 15; \
272 spin_unlock_irqrestore(&rtc_lock, flags); \
273 val; \
274 })
275
276 #define N_FDC 2
277 #define N_DRIVE 8
278
279 #define EXTRA_FLOPPY_PARAMS
280
281 #endif /* _ASM_X86_FLOPPY_H */
282
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