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
floppy_hardint(int irq,void * dev_id)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 st = 1;
78 for (lcount = virtual_dma_count, lptr = virtual_dma_addr;
79 lcount; lcount--, lptr++) {
80 st = inb(virtual_dma_port + FD_STATUS);
81 st &= STATUS_DMA | STATUS_READY;
82 if (st != (STATUS_DMA | STATUS_READY))
83 break;
84 if (virtual_dma_mode)
85 outb_p(*lptr, virtual_dma_port + FD_DATA);
86 else
87 *lptr = inb_p(virtual_dma_port + FD_DATA);
88 }
89 virtual_dma_count = lcount;
90 virtual_dma_addr = lptr;
91 st = inb(virtual_dma_port + FD_STATUS);
92 }
93
94 #ifdef TRACE_FLPY_INT
95 calls++;
96 #endif
97 if (st == STATUS_DMA)
98 return IRQ_HANDLED;
99 if (!(st & STATUS_DMA)) {
100 virtual_dma_residue += virtual_dma_count;
101 virtual_dma_count = 0;
102 #ifdef TRACE_FLPY_INT
103 printk(KERN_DEBUG "count=%x, residue=%x calls=%d bytes=%d dma_wait=%d\n",
104 virtual_dma_count, virtual_dma_residue, calls, bytes,
105 dma_wait);
106 calls = 0;
107 dma_wait = 0;
108 #endif
109 doing_pdma = 0;
110 floppy_interrupt(irq, dev_id);
111 return IRQ_HANDLED;
112 }
113 #ifdef TRACE_FLPY_INT
114 if (!virtual_dma_count)
115 dma_wait++;
116 #endif
117 return IRQ_HANDLED;
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,
149 0, "floppy", NULL);
150 else
151 return request_irq(FLOPPY_IRQ, floppy_interrupt,
152 0, "floppy", NULL);
153 }
154
dma_mem_alloc(unsigned long size)155 static unsigned long dma_mem_alloc(unsigned long size)
156 {
157 return __get_dma_pages(GFP_KERNEL|__GFP_NORETRY, get_order(size));
158 }
159
160
vdma_mem_alloc(unsigned long size)161 static unsigned long vdma_mem_alloc(unsigned long size)
162 {
163 return (unsigned long)vmalloc(size);
164
165 }
166
167 #define nodma_mem_alloc(size) vdma_mem_alloc(size)
168
_fd_dma_mem_free(unsigned long addr,unsigned long size)169 static void _fd_dma_mem_free(unsigned long addr, unsigned long size)
170 {
171 if ((unsigned long)addr >= (unsigned long)high_memory)
172 vfree((void *)addr);
173 else
174 free_pages(addr, get_order(size));
175 }
176
177 #define fd_dma_mem_free(addr, size) _fd_dma_mem_free(addr, size)
178
_fd_chose_dma_mode(char * addr,unsigned long size)179 static void _fd_chose_dma_mode(char *addr, unsigned long size)
180 {
181 if (can_use_virtual_dma == 2) {
182 if ((unsigned long)addr >= (unsigned long)high_memory ||
183 isa_virt_to_bus(addr) >= 0x1000000 ||
184 _CROSS_64KB(addr, size, 0))
185 use_virtual_dma = 1;
186 else
187 use_virtual_dma = 0;
188 } else {
189 use_virtual_dma = can_use_virtual_dma & 1;
190 }
191 }
192
193 #define fd_chose_dma_mode(addr, size) _fd_chose_dma_mode(addr, size)
194
195
vdma_dma_setup(char * addr,unsigned long size,int mode,int io)196 static int vdma_dma_setup(char *addr, unsigned long size, int mode, int io)
197 {
198 doing_pdma = 1;
199 virtual_dma_port = io;
200 virtual_dma_mode = (mode == DMA_MODE_WRITE);
201 virtual_dma_addr = addr;
202 virtual_dma_count = size;
203 virtual_dma_residue = 0;
204 return 0;
205 }
206
hard_dma_setup(char * addr,unsigned long size,int mode,int io)207 static int hard_dma_setup(char *addr, unsigned long size, int mode, int io)
208 {
209 #ifdef FLOPPY_SANITY_CHECK
210 if (CROSS_64KB(addr, size)) {
211 printk("DMA crossing 64-K boundary %p-%p\n", addr, addr+size);
212 return -1;
213 }
214 #endif
215 /* actual, physical DMA */
216 doing_pdma = 0;
217 clear_dma_ff(FLOPPY_DMA);
218 set_dma_mode(FLOPPY_DMA, mode);
219 set_dma_addr(FLOPPY_DMA, isa_virt_to_bus(addr));
220 set_dma_count(FLOPPY_DMA, size);
221 enable_dma(FLOPPY_DMA);
222 return 0;
223 }
224
225 static struct fd_routine_l {
226 int (*_request_dma)(unsigned int dmanr, const char *device_id);
227 void (*_free_dma)(unsigned int dmanr);
228 int (*_get_dma_residue)(unsigned int dummy);
229 unsigned long (*_dma_mem_alloc)(unsigned long size);
230 int (*_dma_setup)(char *addr, unsigned long size, int mode, int io);
231 } fd_routine[] = {
232 {
233 ._request_dma = request_dma,
234 ._free_dma = free_dma,
235 ._get_dma_residue = get_dma_residue,
236 ._dma_mem_alloc = dma_mem_alloc,
237 ._dma_setup = hard_dma_setup
238 },
239 {
240 ._request_dma = vdma_request_dma,
241 ._free_dma = vdma_nop,
242 ._get_dma_residue = vdma_get_dma_residue,
243 ._dma_mem_alloc = vdma_mem_alloc,
244 ._dma_setup = vdma_dma_setup
245 }
246 };
247
248
249 static int FDC1 = 0x3f0;
250 static int FDC2 = -1;
251
252 /*
253 * Floppy types are stored in the rtc's CMOS RAM and so rtc_lock
254 * is needed to prevent corrupted CMOS RAM in case "insmod floppy"
255 * coincides with another rtc CMOS user. Paul G.
256 */
257 #define FLOPPY0_TYPE \
258 ({ \
259 unsigned long flags; \
260 unsigned char val; \
261 spin_lock_irqsave(&rtc_lock, flags); \
262 val = (CMOS_READ(0x10) >> 4) & 15; \
263 spin_unlock_irqrestore(&rtc_lock, flags); \
264 val; \
265 })
266
267 #define FLOPPY1_TYPE \
268 ({ \
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 EXTRA_FLOPPY_PARAMS
281
282 #endif /* _ASM_X86_FLOPPY_H */
283