blob: 63a05ed95c17f1fd833385364c1fab00c1bf9bab [file] [log] [blame]
Linus Torvalds1da177e2005-04-16 15:20:36 -07001/*
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
20asmlinkage 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
47static int virtual_dma_count=0;
48static int virtual_dma_residue=0;
Al Viroa5d361f2006-01-12 01:06:34 -080049static char *virtual_dma_addr=NULL;
Linus Torvalds1da177e2005-04-16 15:20:36 -070050static int virtual_dma_mode=0;
51static int doing_pdma=0;
52
53#include <asm/sun3xflop.h>
54
55extern spinlock_t dma_spin_lock;
56
57static __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
64static __inline__ void release_dma_lock(unsigned long flags)
65{
66 spin_unlock_irqrestore(&dma_spin_lock, flags);
67}
68
69
70static __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
79static __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
88static int fd_request_irq(void)
89{
90 if(MACH_IS_Q40)
91 return request_irq(FLOPPY_IRQ, floppy_hardint,SA_INTERRUPT,
92 "floppy", floppy_hardint);
93 else if(MACH_IS_SUN3X)
94 return sun3xflop_request_irq();
95 return -ENXIO;
96}
97
98static 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
121static 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
136static int vdma_request_dma(unsigned int dmanr, const char * device_id)
137{
138 return 0;
139}
140
141
142static int vdma_get_dma_residue(unsigned int dummy)
143{
144 return virtual_dma_count + virtual_dma_residue;
145}
146
147
148static unsigned long vdma_mem_alloc(unsigned long size)
149{
150 return (unsigned long) vmalloc(size);
151
152}
153
154static 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
163static 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
176static 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
187asmlinkage 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