Commit | Line | Data |
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b515e476 TG |
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 | */ | |
1965aae3 PA |
10 | #ifndef _ASM_X86_FLOPPY_H |
11 | #define _ASM_X86_FLOPPY_H | |
b515e476 TG |
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 | */ | |
4637bc07 JP |
23 | #define _CROSS_64KB(a, s, vdma) \ |
24 | (!(vdma) && \ | |
25 | ((unsigned long)(a)/K_64 != ((unsigned long)(a) + (s) - 1) / K_64)) | |
b515e476 | 26 | |
4637bc07 | 27 | #define CROSS_64KB(a, s) _CROSS_64KB(a, s, use_virtual_dma & 1) |
b515e476 TG |
28 | |
29 | ||
4637bc07 | 30 | #define SW fd_routine[use_virtual_dma & 1] |
b515e476 TG |
31 | #define CSW fd_routine[can_use_virtual_dma & 1] |
32 | ||
33 | ||
34 | #define fd_inb(port) inb_p(port) | |
4637bc07 | 35 | #define fd_outb(value, port) outb_p(value, port) |
b515e476 | 36 | |
4637bc07 | 37 | #define fd_request_dma() CSW._request_dma(FLOPPY_DMA, "floppy") |
b515e476 TG |
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 | { | |
537e3313 | 56 | unsigned char st; |
b515e476 TG |
57 | |
58 | #undef TRACE_FLPY_INT | |
59 | ||
60 | #ifdef TRACE_FLPY_INT | |
4637bc07 JP |
61 | static int calls; |
62 | static int bytes; | |
63 | static int dma_wait; | |
96a388de | 64 | #endif |
b515e476 TG |
65 | if (!doing_pdma) |
66 | return floppy_interrupt(irq, dev_id); | |
67 | ||
68 | #ifdef TRACE_FLPY_INT | |
4637bc07 | 69 | if (!calls) |
b515e476 TG |
70 | bytes = virtual_dma_count; |
71 | #endif | |
72 | ||
73 | { | |
537e3313 JJ |
74 | int lcount; |
75 | char *lptr; | |
b515e476 TG |
76 | |
77 | st = 1; | |
4637bc07 JP |
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) | |
b515e476 | 82 | break; |
4637bc07 JP |
83 | if (virtual_dma_mode) |
84 | outb_p(*lptr, virtual_dma_port + 5); | |
b515e476 | 85 | else |
4637bc07 | 86 | *lptr = inb_p(virtual_dma_port + 5); |
b515e476 TG |
87 | } |
88 | virtual_dma_count = lcount; | |
89 | virtual_dma_addr = lptr; | |
4637bc07 | 90 | st = inb(virtual_dma_port + 4); |
b515e476 TG |
91 | } |
92 | ||
93 | #ifdef TRACE_FLPY_INT | |
94 | calls++; | |
95 | #endif | |
4637bc07 | 96 | if (st == 0x20) |
b515e476 | 97 | return IRQ_HANDLED; |
4637bc07 | 98 | if (!(st & 0x20)) { |
b515e476 | 99 | virtual_dma_residue += virtual_dma_count; |
4637bc07 | 100 | virtual_dma_count = 0; |
b515e476 TG |
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; | |
4637bc07 | 106 | dma_wait = 0; |
b515e476 TG |
107 | #endif |
108 | doing_pdma = 0; | |
109 | floppy_interrupt(irq, dev_id); | |
110 | return IRQ_HANDLED; | |
111 | } | |
112 | #ifdef TRACE_FLPY_INT | |
4637bc07 | 113 | if (!virtual_dma_count) |
b515e476 TG |
114 | dma_wait++; |
115 | #endif | |
116 | return IRQ_HANDLED; | |
117 | } | |
118 | ||
119 | static void fd_disable_dma(void) | |
120 | { | |
4637bc07 | 121 | if (!(can_use_virtual_dma & 1)) |
b515e476 TG |
122 | disable_dma(FLOPPY_DMA); |
123 | doing_pdma = 0; | |
124 | virtual_dma_residue += virtual_dma_count; | |
4637bc07 | 125 | virtual_dma_count = 0; |
b515e476 TG |
126 | } |
127 | ||
4637bc07 | 128 | static int vdma_request_dma(unsigned int dmanr, const char *device_id) |
b515e476 TG |
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 | { | |
4637bc07 | 146 | if (can_use_virtual_dma) |
b515e476 TG |
147 | return request_irq(FLOPPY_IRQ, floppy_hardint, |
148 | IRQF_DISABLED, "floppy", NULL); | |
149 | else | |
150 | return request_irq(FLOPPY_IRQ, floppy_interrupt, | |
151 | IRQF_DISABLED, "floppy", NULL); | |
152 | } | |
153 | ||
154 | static unsigned long dma_mem_alloc(unsigned long size) | |
155 | { | |
4637bc07 | 156 | return __get_dma_pages(GFP_KERNEL|__GFP_NORETRY, get_order(size)); |
b515e476 TG |
157 | } |
158 | ||
159 | ||
160 | static unsigned long vdma_mem_alloc(unsigned long size) | |
161 | { | |
4637bc07 | 162 | return (unsigned long)vmalloc(size); |
b515e476 TG |
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 | { | |
4637bc07 | 170 | if ((unsigned long)addr >= (unsigned long)high_memory) |
b515e476 TG |
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 | { | |
4637bc07 JP |
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)) | |
b515e476 TG |
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; | |
4637bc07 | 199 | virtual_dma_mode = (mode == DMA_MODE_WRITE); |
b515e476 TG |
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); | |
4637bc07 JP |
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); | |
b515e476 TG |
220 | enable_dma(FLOPPY_DMA); |
221 | return 0; | |
222 | } | |
223 | ||
224 | static struct fd_routine_l { | |
4637bc07 | 225 | int (*_request_dma)(unsigned int dmanr, const char *device_id); |
b515e476 TG |
226 | void (*_free_dma)(unsigned int dmanr); |
227 | int (*_get_dma_residue)(unsigned int dummy); | |
4637bc07 | 228 | unsigned long (*_dma_mem_alloc)(unsigned long size); |
b515e476 TG |
229 | int (*_dma_setup)(char *addr, unsigned long size, int mode, int io); |
230 | } fd_routine[] = { | |
231 | { | |
232 | request_dma, | |
233 | free_dma, | |
234 | get_dma_residue, | |
235 | dma_mem_alloc, | |
236 | hard_dma_setup | |
237 | }, | |
238 | { | |
239 | vdma_request_dma, | |
240 | vdma_nop, | |
241 | vdma_get_dma_residue, | |
242 | vdma_mem_alloc, | |
243 | 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 | */ | |
4637bc07 JP |
256 | #define FLOPPY0_TYPE \ |
257 | ({ \ | |
b515e476 TG |
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 | ||
4637bc07 JP |
266 | #define FLOPPY1_TYPE \ |
267 | ({ \ | |
b515e476 TG |
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 | ||
1965aae3 | 281 | #endif /* _ASM_X86_FLOPPY_H */ |