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1da177e4 LT |
1 | /* |
2 | * Architecture specific parts of the Floppy driver | |
3 | * include/asm-i386/floppy.h | |
4 | * | |
5 | * This file is subject to the terms and conditions of the GNU General Public | |
6 | * License. See the file "COPYING" in the main directory of this archive | |
7 | * for more details. | |
8 | * | |
9 | * Copyright (C) 1995 | |
10 | */ | |
11 | #ifndef __ASM_SH_FLOPPY_H | |
12 | #define __ASM_SH_FLOPPY_H | |
13 | ||
14 | #include <linux/vmalloc.h> | |
15 | ||
16 | ||
17 | /* | |
18 | * The DMA channel used by the floppy controller cannot access data at | |
19 | * addresses >= 16MB | |
20 | * | |
21 | * Went back to the 1MB limit, as some people had problems with the floppy | |
22 | * driver otherwise. It doesn't matter much for performance anyway, as most | |
23 | * floppy accesses go through the track buffer. | |
24 | */ | |
25 | #define _CROSS_64KB(a,s,vdma) \ | |
26 | (!vdma && ((unsigned long)(a)/K_64 != ((unsigned long)(a) + (s) - 1) / K_64)) | |
27 | ||
28 | #define CROSS_64KB(a,s) _CROSS_64KB(a,s,use_virtual_dma & 1) | |
29 | ||
30 | ||
31 | #define SW fd_routine[use_virtual_dma&1] | |
32 | #define CSW fd_routine[can_use_virtual_dma & 1] | |
33 | ||
34 | ||
35 | #define fd_inb(port) inb_p(port) | |
36 | #define fd_outb(value,port) outb_p(value,port) | |
37 | ||
38 | #define fd_request_dma() CSW._request_dma(FLOPPY_DMA,"floppy") | |
39 | #define fd_free_dma() CSW._free_dma(FLOPPY_DMA) | |
40 | #define fd_enable_irq() enable_irq(FLOPPY_IRQ) | |
41 | #define fd_disable_irq() disable_irq(FLOPPY_IRQ) | |
42 | #define fd_free_irq() free_irq(FLOPPY_IRQ, NULL) | |
43 | #define fd_get_dma_residue() SW._get_dma_residue(FLOPPY_DMA) | |
44 | #define fd_dma_mem_alloc(size) SW._dma_mem_alloc(size) | |
45 | #define fd_dma_setup(addr, size, mode, io) SW._dma_setup(addr, size, mode, io) | |
46 | ||
47 | #define FLOPPY_CAN_FALLBACK_ON_NODMA | |
48 | ||
49 | static int virtual_dma_count; | |
50 | static int virtual_dma_residue; | |
51 | static char *virtual_dma_addr; | |
52 | static int virtual_dma_mode; | |
53 | static int doing_pdma; | |
54 | ||
55 | static void floppy_hardint(int irq, void *dev_id, struct pt_regs * regs) | |
56 | { | |
57 | register unsigned char st; | |
58 | ||
59 | #undef TRACE_FLPY_INT | |
60 | ||
61 | #ifdef TRACE_FLPY_INT | |
62 | static int calls=0; | |
63 | static int bytes=0; | |
64 | static int dma_wait=0; | |
65 | #endif | |
66 | if(!doing_pdma) { | |
67 | floppy_interrupt(irq, dev_id, regs); | |
68 | return; | |
69 | } | |
70 | ||
71 | #ifdef TRACE_FLPY_INT | |
72 | if(!calls) | |
73 | bytes = virtual_dma_count; | |
74 | #endif | |
75 | ||
76 | { | |
77 | register int lcount; | |
78 | register char *lptr; | |
79 | ||
80 | st = 1; | |
81 | for(lcount=virtual_dma_count, lptr=virtual_dma_addr; | |
82 | lcount; lcount--, lptr++) { | |
83 | st=inb(virtual_dma_port+4) & 0xa0 ; | |
84 | if(st != 0xa0) | |
85 | break; | |
86 | if(virtual_dma_mode) | |
87 | outb_p(*lptr, virtual_dma_port+5); | |
88 | else | |
89 | *lptr = inb_p(virtual_dma_port+5); | |
90 | } | |
91 | virtual_dma_count = lcount; | |
92 | virtual_dma_addr = lptr; | |
93 | st = inb(virtual_dma_port+4); | |
94 | } | |
95 | ||
96 | #ifdef TRACE_FLPY_INT | |
97 | calls++; | |
98 | #endif | |
99 | if(st == 0x20) | |
100 | return; | |
101 | if(!(st & 0x20)) { | |
102 | virtual_dma_residue += virtual_dma_count; | |
103 | virtual_dma_count=0; | |
104 | #ifdef TRACE_FLPY_INT | |
105 | printk("count=%x, residue=%x calls=%d bytes=%d dma_wait=%d\n", | |
106 | virtual_dma_count, virtual_dma_residue, calls, bytes, | |
107 | dma_wait); | |
108 | calls = 0; | |
109 | dma_wait=0; | |
110 | #endif | |
111 | doing_pdma = 0; | |
112 | floppy_interrupt(irq, dev_id, regs); | |
113 | return; | |
114 | } | |
115 | #ifdef TRACE_FLPY_INT | |
116 | if(!virtual_dma_count) | |
117 | dma_wait++; | |
118 | #endif | |
119 | } | |
120 | ||
121 | static void fd_disable_dma(void) | |
122 | { | |
123 | if(! (can_use_virtual_dma & 1)) | |
124 | disable_dma(FLOPPY_DMA); | |
125 | doing_pdma = 0; | |
126 | virtual_dma_residue += virtual_dma_count; | |
127 | virtual_dma_count=0; | |
128 | } | |
129 | ||
130 | static int vdma_request_dma(unsigned int dmanr, const char * device_id) | |
131 | { | |
132 | return 0; | |
133 | } | |
134 | ||
135 | static void vdma_nop(unsigned int dummy) | |
136 | { | |
137 | } | |
138 | ||
139 | ||
140 | static int vdma_get_dma_residue(unsigned int dummy) | |
141 | { | |
142 | return virtual_dma_count + virtual_dma_residue; | |
143 | } | |
144 | ||
145 | ||
146 | static int fd_request_irq(void) | |
147 | { | |
148 | if(can_use_virtual_dma) | |
149 | return request_irq(FLOPPY_IRQ, floppy_hardint,SA_INTERRUPT, | |
150 | "floppy", NULL); | |
151 | else | |
152 | return request_irq(FLOPPY_IRQ, floppy_interrupt, | |
153 | SA_INTERRUPT|SA_SAMPLE_RANDOM, | |
154 | "floppy", NULL); | |
155 | ||
156 | } | |
157 | ||
158 | static unsigned long dma_mem_alloc(unsigned long size) | |
159 | { | |
160 | return __get_dma_pages(GFP_KERNEL,get_order(size)); | |
161 | } | |
162 | ||
163 | ||
164 | static unsigned long vdma_mem_alloc(unsigned long size) | |
165 | { | |
166 | return (unsigned long) vmalloc(size); | |
167 | ||
168 | } | |
169 | ||
170 | #define nodma_mem_alloc(size) vdma_mem_alloc(size) | |
171 | ||
172 | static void _fd_dma_mem_free(unsigned long addr, unsigned long size) | |
173 | { | |
174 | if((unsigned int) addr >= (unsigned int) high_memory) | |
175 | return vfree((void *)addr); | |
176 | else | |
177 | free_pages(addr, get_order(size)); | |
178 | } | |
179 | ||
180 | #define fd_dma_mem_free(addr, size) _fd_dma_mem_free(addr, size) | |
181 | ||
182 | static void _fd_chose_dma_mode(char *addr, unsigned long size) | |
183 | { | |
184 | if(can_use_virtual_dma == 2) { | |
185 | if((unsigned int) addr >= (unsigned int) high_memory || | |
186 | virt_to_bus(addr) >= 0x10000000) | |
187 | use_virtual_dma = 1; | |
188 | else | |
189 | use_virtual_dma = 0; | |
190 | } else { | |
191 | use_virtual_dma = can_use_virtual_dma & 1; | |
192 | } | |
193 | } | |
194 | ||
195 | #define fd_chose_dma_mode(addr, size) _fd_chose_dma_mode(addr, size) | |
196 | ||
197 | ||
198 | static int vdma_dma_setup(char *addr, unsigned long size, int mode, int io) | |
199 | { | |
200 | doing_pdma = 1; | |
201 | virtual_dma_port = io; | |
202 | virtual_dma_mode = (mode == DMA_MODE_WRITE); | |
203 | virtual_dma_addr = addr; | |
204 | virtual_dma_count = size; | |
205 | virtual_dma_residue = 0; | |
206 | return 0; | |
207 | } | |
208 | ||
209 | static int hard_dma_setup(char *addr, unsigned long size, int mode, int io) | |
210 | { | |
211 | #ifdef FLOPPY_SANITY_CHECK | |
212 | if (CROSS_64KB(addr, size)) { | |
213 | printk("DMA crossing 64-K boundary %p-%p\n", addr, addr+size); | |
214 | return -1; | |
215 | } | |
216 | #endif | |
217 | ||
218 | dma_cache_wback_inv(addr, size); | |
219 | ||
220 | /* actual, physical DMA */ | |
221 | doing_pdma = 0; | |
222 | clear_dma_ff(FLOPPY_DMA); | |
223 | set_dma_mode(FLOPPY_DMA,mode); | |
224 | set_dma_addr(FLOPPY_DMA,virt_to_bus(addr)); | |
225 | set_dma_count(FLOPPY_DMA,size); | |
226 | enable_dma(FLOPPY_DMA); | |
227 | return 0; | |
228 | } | |
229 | ||
75c96f85 | 230 | static struct fd_routine_l { |
1da177e4 LT |
231 | int (*_request_dma)(unsigned int dmanr, const char * device_id); |
232 | void (*_free_dma)(unsigned int dmanr); | |
233 | int (*_get_dma_residue)(unsigned int dummy); | |
234 | unsigned long (*_dma_mem_alloc) (unsigned long size); | |
235 | int (*_dma_setup)(char *addr, unsigned long size, int mode, int io); | |
236 | } fd_routine[] = { | |
237 | { | |
238 | request_dma, | |
239 | free_dma, | |
240 | get_dma_residue, | |
241 | dma_mem_alloc, | |
242 | hard_dma_setup | |
243 | }, | |
244 | { | |
245 | vdma_request_dma, | |
246 | vdma_nop, | |
247 | vdma_get_dma_residue, | |
248 | vdma_mem_alloc, | |
249 | vdma_dma_setup | |
250 | } | |
251 | }; | |
252 | ||
253 | ||
254 | static int FDC1 = 0x3f0; | |
255 | static int FDC2 = -1; | |
256 | ||
257 | /* | |
258 | * Floppy types are stored in the rtc's CMOS RAM and so rtc_lock | |
259 | * is needed to prevent corrupted CMOS RAM in case "insmod floppy" | |
260 | * coincides with another rtc CMOS user. Paul G. | |
261 | */ | |
262 | #define FLOPPY0_TYPE (4) | |
263 | #define FLOPPY1_TYPE (0) | |
264 | ||
265 | #define N_FDC 2 | |
266 | #define N_DRIVE 8 | |
267 | ||
268 | #define FLOPPY_MOTOR_MASK 0xf0 | |
269 | ||
270 | #define AUTO_DMA | |
271 | ||
272 | #define EXTRA_FLOPPY_PARAMS | |
273 | ||
274 | #endif /* __ASM_SH_FLOPPY_H */ |