blob: 697d50393dd07d8db81b73e22544aa3fc325d24d [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
Al Viro2850bc22006-10-07 14:16:45 +010020asmlinkage irqreturn_t floppy_hardint(int irq, void *dev_id);
Linus Torvalds1da177e2005-04-16 15:20:36 -070021
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
Linus Torvalds1da177e2005-04-16 15:20:36 -070034/* 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
43static int virtual_dma_count=0;
44static int virtual_dma_residue=0;
Al Viroa5d361f2006-01-12 01:06:34 -080045static char *virtual_dma_addr=NULL;
Linus Torvalds1da177e2005-04-16 15:20:36 -070046static int virtual_dma_mode=0;
47static int doing_pdma=0;
48
49#include <asm/sun3xflop.h>
50
51extern spinlock_t dma_spin_lock;
52
53static __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
60static __inline__ void release_dma_lock(unsigned long flags)
61{
62 spin_unlock_irqrestore(&dma_spin_lock, flags);
63}
64
65
66static __inline__ unsigned char fd_inb(int port)
67{
68 if(MACH_IS_Q40)
69 return inb_p(port);
70 else if(MACH_IS_SUN3X)
71 return sun3x_82072_fd_inb(port);
72 return 0;
73}
74
75static __inline__ void fd_outb(unsigned char value, int port)
76{
77 if(MACH_IS_Q40)
78 outb_p(value, port);
79 else if(MACH_IS_SUN3X)
80 sun3x_82072_fd_outb(value, port);
81}
82
83
84static int fd_request_irq(void)
85{
86 if(MACH_IS_Q40)
Thomas Gleixnerb0b9fdc2006-07-01 19:29:19 -070087 return request_irq(FLOPPY_IRQ, floppy_hardint,
88 IRQF_DISABLED, "floppy", floppy_hardint);
Linus Torvalds1da177e2005-04-16 15:20:36 -070089 else if(MACH_IS_SUN3X)
90 return sun3xflop_request_irq();
91 return -ENXIO;
92}
93
94static 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
117static 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
132static int vdma_request_dma(unsigned int dmanr, const char * device_id)
133{
134 return 0;
135}
136
137
138static int vdma_get_dma_residue(unsigned int dummy)
139{
140 return virtual_dma_count + virtual_dma_residue;
141}
142
143
144static unsigned long vdma_mem_alloc(unsigned long size)
145{
146 return (unsigned long) vmalloc(size);
147
148}
149
150static 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
159static 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
172static 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
Al Viro2850bc22006-10-07 14:16:45 +0100183asmlinkage irqreturn_t floppy_hardint(int irq, void *dev_id)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700184{
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) {
Al Viro2850bc22006-10-07 14:16:45 +0100196 floppy_interrupt(irq, dev_id);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700197 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+4) & 0xa0 ;
215 if(st != 0xa0)
216 break;
217 if(virtual_dma_mode)
218 outb_p(*lptr, virtual_dma_port+5);
219 else
220 *lptr = inb_p(virtual_dma_port+5);
221 }
222
223 virtual_dma_count = lcount;
224 virtual_dma_addr = lptr;
225 st = inb(virtual_dma_port+4);
226 }
227
228#ifdef TRACE_FLPY_INT
229 calls++;
230#endif
231 if(st == 0x20)
232 return IRQ_HANDLED;
233 if(!(st & 0x20)) {
234 virtual_dma_residue += virtual_dma_count;
235 virtual_dma_count=0;
236#ifdef TRACE_FLPY_INT
237 printk("count=%x, residue=%x calls=%d bytes=%d dma_wait=%d\n",
238 virtual_dma_count, virtual_dma_residue, calls, bytes,
239 dma_wait);
240 calls = 0;
241 dma_wait=0;
242#endif
243 doing_pdma = 0;
Al Viro2850bc22006-10-07 14:16:45 +0100244 floppy_interrupt(irq, dev_id);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700245 return IRQ_HANDLED;
246 }
247#ifdef TRACE_FLPY_INT
248 if(!virtual_dma_count)
249 dma_wait++;
250#endif
251 return IRQ_HANDLED;
252}
253
254#define EXTRA_FLOPPY_PARAMS