1 /*
2 * Implementation independent bits of the Floppy driver.
3 *
4 * much of this file is derived from what was originally the Q40 floppy driver.
5 *
6 * This file is subject to the terms and conditions of the GNU General Public
7 * License. See the file "COPYING" in the main directory of this archive
8 * for more details.
9 *
10 * Copyright (C) 1999, 2000, 2001
11 *
12 * Sun3x support added 2/4/2000 Sam Creasey (sammy@sammy.net)
13 *
14 */
15
16 #include <asm/io.h>
17
18 #include <linux/vmalloc.h>
19
20 asmlinkage irqreturn_t floppy_hardint(int irq, void *dev_id);
21
22 /* constants... */
23
24 #undef MAX_DMA_ADDRESS
25 #define MAX_DMA_ADDRESS 0x00 /* nothing like that */
26
27
28 /*
29 * Again, the CMOS information doesn't work on m68k..
30 */
31 #define FLOPPY0_TYPE (MACH_IS_Q40 ? 6 : 4)
32 #define FLOPPY1_TYPE 0
33
34 /* basically PC init + set use_virtual_dma */
35 #define FDC1 m68k_floppy_init()
36
37 #define N_FDC 1
38 #define N_DRIVE 8
39
40
41 /* vdma globals adapted from asm-i386/floppy.h */
42
43 static int virtual_dma_count=0;
44 static int virtual_dma_residue=0;
45 static char *virtual_dma_addr=NULL;
46 static int virtual_dma_mode=0;
47 static int doing_pdma=0;
48
49 #include <asm/sun3xflop.h>
50
51 extern spinlock_t dma_spin_lock;
52
53 static __inline__ unsigned long claim_dma_lock(void)
54 {
55 unsigned long flags;
56 spin_lock_irqsave(&dma_spin_lock, flags);
57 return flags;
58 }
59
60 static __inline__ void release_dma_lock(unsigned long flags)
61 {
62 spin_unlock_irqrestore(&dma_spin_lock, flags);
63 }
64
65
66 static __inline__ unsigned char fd_inb(int base, int reg)
67 {
68 if(MACH_IS_Q40)
69 return inb_p(base + reg);
70 else if(MACH_IS_SUN3X)
71 return sun3x_82072_fd_inb(base + reg);
72 return 0;
73 }
74
75 static __inline__ void fd_outb(unsigned char value, int base, int reg)
76 {
77 if(MACH_IS_Q40)
78 outb_p(value, base + reg);
79 else if(MACH_IS_SUN3X)
80 sun3x_82072_fd_outb(value, base + reg);
81 }
82
83
84 static int fd_request_irq(void)
85 {
86 if(MACH_IS_Q40)
87 return request_irq(FLOPPY_IRQ, floppy_hardint,
88 0, "floppy", floppy_hardint);
89 else if(MACH_IS_SUN3X)
90 return sun3xflop_request_irq();
91 return -ENXIO;
92 }
93
94 static void fd_free_irq(void)
95 {
96 if(MACH_IS_Q40)
97 free_irq(FLOPPY_IRQ, floppy_hardint);
98 }
99
100 #define fd_request_dma() vdma_request_dma(FLOPPY_DMA,"floppy")
101 #define fd_get_dma_residue() vdma_get_dma_residue(FLOPPY_DMA)
102 #define fd_dma_mem_alloc(size) vdma_mem_alloc(size)
103 #define fd_dma_setup(addr, size, mode, io) vdma_dma_setup(addr, size, mode, io)
104
105 #define fd_enable_irq() /* nothing... */
106 #define fd_disable_irq() /* nothing... */
107
108 #define fd_free_dma() /* nothing */
109
110 /* No 64k boundary crossing problems on Q40 - no DMA at all */
111 #define CROSS_64KB(a,s) (0)
112
113 #define DMA_MODE_READ 0x44 /* i386 look-alike */
114 #define DMA_MODE_WRITE 0x48
115
116
117 static int m68k_floppy_init(void)
118 {
119 use_virtual_dma =1;
120 can_use_virtual_dma = 1;
121
122
123 if (MACH_IS_Q40)
124 return 0x3f0;
125 else if(MACH_IS_SUN3X)
126 return sun3xflop_init();
127 else
128 return -1;
129 }
130
131
132 static int vdma_request_dma(unsigned int dmanr, const char * device_id)
133 {
134 return 0;
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 unsigned long vdma_mem_alloc(unsigned long size)
145 {
146 return (unsigned long) vmalloc(size);
147
148 }
149
150 static void _fd_dma_mem_free(unsigned long addr, unsigned long size)
151 {
152 vfree((void *)addr);
153 }
154 #define fd_dma_mem_free(addr,size) _fd_dma_mem_free(addr, size)
155
156
157 /* choose_dma_mode ???*/
158
159 static int vdma_dma_setup(char *addr, unsigned long size, int mode, int io)
160 {
161 doing_pdma = 1;
162 virtual_dma_port = (MACH_IS_Q40 ? io : 0);
163 virtual_dma_mode = (mode == DMA_MODE_WRITE);
164 virtual_dma_addr = addr;
165 virtual_dma_count = size;
166 virtual_dma_residue = 0;
167 return 0;
168 }
169
170
171
172 static void fd_disable_dma(void)
173 {
174 doing_pdma = 0;
175 virtual_dma_residue += virtual_dma_count;
176 virtual_dma_count=0;
177 }
178
179
180
181 /* this is the only truly Q40 specific function */
182
183 asmlinkage irqreturn_t floppy_hardint(int irq, void *dev_id)
184 {
185 register unsigned char st;
186
187 #undef TRACE_FLPY_INT
188 #define NO_FLOPPY_ASSEMBLER
189
190 #ifdef TRACE_FLPY_INT
191 static int calls=0;
192 static int bytes=0;
193 static int dma_wait=0;
194 #endif
195 if(!doing_pdma) {
196 floppy_interrupt(irq, dev_id);
197 return IRQ_HANDLED;
198 }
199
200 #ifdef TRACE_FLPY_INT
201 if(!calls)
202 bytes = virtual_dma_count;
203 #endif
204
205 {
206 register int lcount;
207 register char *lptr;
208
209 /* serve 1st byte fast: */
210
211 st=1;
212 for(lcount=virtual_dma_count, lptr=virtual_dma_addr;
213 lcount; lcount--, lptr++) {
214 st = inb(virtual_dma_port + FD_STATUS);
215 st &= STATUS_DMA | STATUS_READY;
216 if (st != (STATUS_DMA | STATUS_READY))
217 break;
218 if(virtual_dma_mode)
219 outb_p(*lptr, virtual_dma_port + FD_DATA);
220 else
221 *lptr = inb_p(virtual_dma_port + FD_DATA);
222 }
223
224 virtual_dma_count = lcount;
225 virtual_dma_addr = lptr;
226 st = inb(virtual_dma_port + FD_STATUS);
227 }
228
229 #ifdef TRACE_FLPY_INT
230 calls++;
231 #endif
232 if (st == STATUS_DMA)
233 return IRQ_HANDLED;
234 if (!(st & STATUS_DMA)) {
235 virtual_dma_residue += virtual_dma_count;
236 virtual_dma_count=0;
237 #ifdef TRACE_FLPY_INT
238 pr_info("count=%x, residue=%x calls=%d bytes=%d dma_wait=%d\n",
239 virtual_dma_count, virtual_dma_residue, calls, bytes,
240 dma_wait);
241 calls = 0;
242 dma_wait=0;
243 #endif
244 doing_pdma = 0;
245 floppy_interrupt(irq, dev_id);
246 return IRQ_HANDLED;
247 }
248 #ifdef TRACE_FLPY_INT
249 if(!virtual_dma_count)
250 dma_wait++;
251 #endif
252 return IRQ_HANDLED;
253 }
254
255 #define EXTRA_FLOPPY_PARAMS
256
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