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(port) inb_p(port)
35#define fd_outb(value, port) outb_p(value, port)
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
48static int virtual_dma_count;
49static int virtual_dma_residue;
50static char *virtual_dma_addr;
51static int virtual_dma_mode;
52static int doing_pdma;
53
54static 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 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);
87 }
88 virtual_dma_count = lcount;
89 virtual_dma_addr = lptr;
90 st = inb(virtual_dma_port + 4);
91 }
92
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(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
119static 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
128static int vdma_request_dma(unsigned int dmanr, const char *device_id)
129{
130 return 0;
131}
132
133static void vdma_nop(unsigned int dummy)
134{
135}
136
137
138static int vdma_get_dma_residue(unsigned int dummy)
139{
140 return virtual_dma_count + virtual_dma_residue;
141}
142
143
144static 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
154static unsigned long dma_mem_alloc(unsigned long size)
155{
156 return __get_dma_pages(GFP_KERNEL|__GFP_NORETRY, get_order(size));
157}
158
159
160static 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
168static 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
178static 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
195static 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
206static 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
224static 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
248static int FDC1 = 0x3f0;
249static 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