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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                                       struct pt_regs *regs);
22
23 /* constants... */
24
25 #undef MAX_DMA_ADDRESS
26 #define MAX_DMA_ADDRESS   0x00  /* nothing like that */
27
28
29 /*
30  * Again, the CMOS information doesn't work on m68k..
31  */
32 #define FLOPPY0_TYPE (MACH_IS_Q40 ? 6 : 4)
33 #define FLOPPY1_TYPE 0
34
35 #define FLOPPY_MOTOR_MASK 0xf0
36
37
38 /* basically PC init + set use_virtual_dma */
39 #define  FDC1 m68k_floppy_init()
40
41 #define N_FDC 1
42 #define N_DRIVE 8
43
44
45 /* vdma globals adapted from asm-i386/floppy.h */
46
47 static int virtual_dma_count=0;
48 static int virtual_dma_residue=0;
49 static char *virtual_dma_addr=NULL;
50 static int virtual_dma_mode=0;
51 static int doing_pdma=0;
52
53 #include <asm/sun3xflop.h>
54
55 extern spinlock_t  dma_spin_lock;
56
57 static __inline__ unsigned long claim_dma_lock(void)
58 {
59         unsigned long flags;
60         spin_lock_irqsave(&dma_spin_lock, flags);
61         return flags;
62 }
63
64 static __inline__ void release_dma_lock(unsigned long flags)
65 {
66         spin_unlock_irqrestore(&dma_spin_lock, flags);
67 }
68
69
70 static __inline__ unsigned char fd_inb(int port)
71 {
72         if(MACH_IS_Q40)
73                 return inb_p(port);
74         else if(MACH_IS_SUN3X)
75                 return sun3x_82072_fd_inb(port);
76         return 0;
77 }
78
79 static __inline__ void fd_outb(unsigned char value, int port)
80 {
81         if(MACH_IS_Q40)
82                 outb_p(value, port);
83         else if(MACH_IS_SUN3X)
84                 sun3x_82072_fd_outb(value, port);
85 }
86
87
88 static int fd_request_irq(void)
89 {
90         if(MACH_IS_Q40)
91                 return request_irq(FLOPPY_IRQ, floppy_hardint,
92                                    IRQF_DISABLED, "floppy", floppy_hardint);
93         else if(MACH_IS_SUN3X)
94                 return sun3xflop_request_irq();
95         return -ENXIO;
96 }
97
98 static void fd_free_irq(void)
99 {
100         if(MACH_IS_Q40)
101                 free_irq(FLOPPY_IRQ, floppy_hardint);
102 }
103
104 #define fd_request_dma()        vdma_request_dma(FLOPPY_DMA,"floppy")
105 #define fd_get_dma_residue()    vdma_get_dma_residue(FLOPPY_DMA)
106 #define fd_dma_mem_alloc(size)  vdma_mem_alloc(size)
107 #define fd_dma_setup(addr, size, mode, io) vdma_dma_setup(addr, size, mode, io)
108
109 #define fd_enable_irq()           /* nothing... */
110 #define fd_disable_irq()          /* nothing... */
111
112 #define fd_free_dma()             /* nothing */
113
114 /* No 64k boundary crossing problems on Q40 - no DMA at all */
115 #define CROSS_64KB(a,s) (0)
116
117 #define DMA_MODE_READ  0x44    /* i386 look-alike */
118 #define DMA_MODE_WRITE 0x48
119
120
121 static int m68k_floppy_init(void)
122 {
123   use_virtual_dma =1;
124   can_use_virtual_dma = 1;
125
126
127   if (MACH_IS_Q40)
128           return 0x3f0;
129   else if(MACH_IS_SUN3X)
130           return sun3xflop_init();
131   else
132     return -1;
133 }
134
135
136 static int vdma_request_dma(unsigned int dmanr, const char * device_id)
137 {
138         return 0;
139 }
140
141
142 static int vdma_get_dma_residue(unsigned int dummy)
143 {
144         return virtual_dma_count + virtual_dma_residue;
145 }
146
147
148 static unsigned long vdma_mem_alloc(unsigned long size)
149 {
150         return (unsigned long) vmalloc(size);
151
152 }
153
154 static void _fd_dma_mem_free(unsigned long addr, unsigned long size)
155 {
156         vfree((void *)addr);
157 }
158 #define fd_dma_mem_free(addr,size) _fd_dma_mem_free(addr, size)
159
160
161 /* choose_dma_mode ???*/
162
163 static int vdma_dma_setup(char *addr, unsigned long size, int mode, int io)
164 {
165         doing_pdma = 1;
166         virtual_dma_port = (MACH_IS_Q40 ? io : 0);
167         virtual_dma_mode = (mode  == DMA_MODE_WRITE);
168         virtual_dma_addr = addr;
169         virtual_dma_count = size;
170         virtual_dma_residue = 0;
171         return 0;
172 }
173
174
175
176 static void fd_disable_dma(void)
177 {
178         doing_pdma = 0;
179         virtual_dma_residue += virtual_dma_count;
180         virtual_dma_count=0;
181 }
182
183
184
185 /* this is the only truly Q40 specific function */
186
187 asmlinkage irqreturn_t floppy_hardint(int irq, void *dev_id,
188                                       struct pt_regs *regs)
189 {
190         register unsigned char st;
191
192 #undef TRACE_FLPY_INT
193 #define NO_FLOPPY_ASSEMBLER
194
195 #ifdef TRACE_FLPY_INT
196         static int calls=0;
197         static int bytes=0;
198         static int dma_wait=0;
199 #endif
200         if(!doing_pdma) {
201                 floppy_interrupt(irq, dev_id, regs);
202                 return IRQ_HANDLED;
203         }
204
205 #ifdef TRACE_FLPY_INT
206         if(!calls)
207                 bytes = virtual_dma_count;
208 #endif
209
210         {
211                 register int lcount;
212                 register char *lptr;
213
214                 /* serve 1st byte fast: */
215
216                 st=1;
217                 for(lcount=virtual_dma_count, lptr=virtual_dma_addr;
218                     lcount; lcount--, lptr++) {
219                         st=inb(virtual_dma_port+4) & 0xa0 ;
220                         if(st != 0xa0)
221                                 break;
222                         if(virtual_dma_mode)
223                                 outb_p(*lptr, virtual_dma_port+5);
224                         else
225                                 *lptr = inb_p(virtual_dma_port+5);
226                 }
227
228                 virtual_dma_count = lcount;
229                 virtual_dma_addr = lptr;
230                 st = inb(virtual_dma_port+4);
231         }
232
233 #ifdef TRACE_FLPY_INT
234         calls++;
235 #endif
236         if(st == 0x20)
237                 return IRQ_HANDLED;
238         if(!(st & 0x20)) {
239                 virtual_dma_residue += virtual_dma_count;
240                 virtual_dma_count=0;
241 #ifdef TRACE_FLPY_INT
242                 printk("count=%x, residue=%x calls=%d bytes=%d dma_wait=%d\n",
243                        virtual_dma_count, virtual_dma_residue, calls, bytes,
244                        dma_wait);
245                 calls = 0;
246                 dma_wait=0;
247 #endif
248                 doing_pdma = 0;
249                 floppy_interrupt(irq, dev_id, regs);
250                 return IRQ_HANDLED;
251         }
252 #ifdef TRACE_FLPY_INT
253         if(!virtual_dma_count)
254                 dma_wait++;
255 #endif
256         return IRQ_HANDLED;
257 }
258
259 #define EXTRA_FLOPPY_PARAMS