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1da177e4 LT |
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_I386_FLOPPY_H | |
11 | #define __ASM_I386_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(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 | ||
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 | ||
7d12e780 | 54 | static irqreturn_t floppy_hardint(int irq, void *dev_id) |
1da177e4 LT |
55 | { |
56 | register unsigned char st; | |
57 | ||
58 | #undef TRACE_FLPY_INT | |
1da177e4 LT |
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) | |
7d12e780 | 66 | return floppy_interrupt(irq, dev_id); |
1da177e4 LT |
67 | |
68 | #ifdef TRACE_FLPY_INT | |
69 | if(!calls) | |
70 | bytes = virtual_dma_count; | |
71 | #endif | |
72 | ||
1da177e4 LT |
73 | { |
74 | register int lcount; | |
75 | register 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 | } | |
1da177e4 LT |
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("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; | |
7d12e780 | 109 | floppy_interrupt(irq, dev_id); |
1da177e4 LT |
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) | |
4879d77c TG |
147 | return request_irq(FLOPPY_IRQ, floppy_hardint, |
148 | IRQF_DISABLED, "floppy", NULL); | |
1da177e4 | 149 | else |
4879d77c TG |
150 | return request_irq(FLOPPY_IRQ, floppy_interrupt, |
151 | IRQF_DISABLED, "floppy", NULL); | |
1da177e4 LT |
152 | |
153 | } | |
154 | ||
155 | static unsigned long dma_mem_alloc(unsigned long size) | |
156 | { | |
157 | return __get_dma_pages(GFP_KERNEL,get_order(size)); | |
158 | } | |
159 | ||
160 | ||
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 | ||
169 | static void _fd_dma_mem_free(unsigned long addr, unsigned long size) | |
170 | { | |
171 | if((unsigned int) addr >= (unsigned int) 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 | ||
179 | static void _fd_chose_dma_mode(char *addr, unsigned long size) | |
180 | { | |
181 | if(can_use_virtual_dma == 2) { | |
182 | if((unsigned int) addr >= (unsigned int) 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 | ||
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 | ||
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 | ||
75c96f85 | 225 | static struct fd_routine_l { |
1da177e4 LT |
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, | |
234 | free_dma, | |
235 | get_dma_residue, | |
236 | dma_mem_alloc, | |
237 | hard_dma_setup | |
238 | }, | |
239 | { | |
240 | vdma_request_dma, | |
241 | vdma_nop, | |
242 | vdma_get_dma_residue, | |
243 | vdma_mem_alloc, | |
244 | 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 | 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 | unsigned long flags; \ | |
268 | unsigned char val; \ | |
269 | spin_lock_irqsave(&rtc_lock, flags); \ | |
270 | val = CMOS_READ(0x10) & 15; \ | |
271 | spin_unlock_irqrestore(&rtc_lock, flags); \ | |
272 | val; \ | |
273 | }) | |
274 | ||
275 | #define N_FDC 2 | |
276 | #define N_DRIVE 8 | |
277 | ||
278 | #define FLOPPY_MOTOR_MASK 0xf0 | |
279 | ||
280 | #define AUTO_DMA | |
281 | ||
282 | #define EXTRA_FLOPPY_PARAMS | |
283 | ||
284 | #endif /* __ASM_I386_FLOPPY_H */ |