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 */
10#ifndef __ASM_X86_64_FLOPPY_H
11#define __ASM_X86_64_FLOPPY_H
12
13#include <linux/vmalloc.h>
14
15
16/*
17 * The DMA channel used by the floppy controller cannot access data at
18 * addresses >= 16MB
19 *
20 * Went back to the 1MB limit, as some people had problems with the floppy
21 * driver otherwise. It doesn't matter much for performance anyway, as most
22 * floppy accesses go through the track buffer.
23 */
24#define _CROSS_64KB(a,s,vdma) \
25(!vdma && ((unsigned long)(a)/K_64 != ((unsigned long)(a) + (s) - 1) / K_64))
26
27#define CROSS_64KB(a,s) _CROSS_64KB(a,s,use_virtual_dma & 1)
28
29
30#define SW fd_routine[use_virtual_dma&1]
31#define CSW fd_routine[can_use_virtual_dma & 1]
32
33
34#define fd_inb(port)			inb_p(port)
35#define fd_outb(port,value)		outb_p(port,value)
36
37#define fd_request_dma()        CSW._request_dma(FLOPPY_DMA,"floppy")
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
48static int virtual_dma_count;
49static int virtual_dma_residue;
50static char *virtual_dma_addr;
51static int virtual_dma_mode;
52static int doing_pdma;
53
54static void floppy_hardint(int irq, void *dev_id, struct pt_regs * regs)
55{
56	register unsigned char st;
57
58#undef TRACE_FLPY_INT
59
60#ifdef TRACE_FLPY_INT
61	static int calls=0;
62	static int bytes=0;
63	static int dma_wait=0;
64#endif
65	if(!doing_pdma) {
66		floppy_interrupt(irq, dev_id, regs);
67		return;
68	}
69
70#ifdef TRACE_FLPY_INT
71	if(!calls)
72		bytes = virtual_dma_count;
73#endif
74
75	{
76		register int lcount;
77		register char *lptr;
78
79		st = 1;
80		for(lcount=virtual_dma_count, lptr=virtual_dma_addr;
81		    lcount; lcount--, lptr++) {
82			st=inb(virtual_dma_port+4) & 0xa0 ;
83			if(st != 0xa0)
84				break;
85			if(virtual_dma_mode)
86				outb_p(*lptr, virtual_dma_port+5);
87			else
88				*lptr = inb_p(virtual_dma_port+5);
89		}
90		virtual_dma_count = lcount;
91		virtual_dma_addr = lptr;
92		st = inb(virtual_dma_port+4);
93	}
94
95#ifdef TRACE_FLPY_INT
96	calls++;
97#endif
98	if(st == 0x20)
99		return;
100	if(!(st & 0x20)) {
101		virtual_dma_residue += virtual_dma_count;
102		virtual_dma_count=0;
103#ifdef TRACE_FLPY_INT
104		printk("count=%x, residue=%x calls=%d bytes=%d dma_wait=%d\n",
105		       virtual_dma_count, virtual_dma_residue, calls, bytes,
106		       dma_wait);
107		calls = 0;
108		dma_wait=0;
109#endif
110		doing_pdma = 0;
111		floppy_interrupt(irq, dev_id, regs);
112		return;
113	}
114#ifdef TRACE_FLPY_INT
115	if(!virtual_dma_count)
116		dma_wait++;
117#endif
118}
119
120static void fd_disable_dma(void)
121{
122	if(! (can_use_virtual_dma & 1))
123		disable_dma(FLOPPY_DMA);
124	doing_pdma = 0;
125	virtual_dma_residue += virtual_dma_count;
126	virtual_dma_count=0;
127}
128
129static int vdma_request_dma(unsigned int dmanr, const char * device_id)
130{
131	return 0;
132}
133
134static void vdma_nop(unsigned int dummy)
135{
136}
137
138
139static int vdma_get_dma_residue(unsigned int dummy)
140{
141	return virtual_dma_count + virtual_dma_residue;
142}
143
144
145static int fd_request_irq(void)
146{
147	if(can_use_virtual_dma)
148		return request_irq(FLOPPY_IRQ, floppy_hardint,SA_INTERRUPT,
149						   "floppy", NULL);
150	else
151		return request_irq(FLOPPY_IRQ, floppy_interrupt,
152						   SA_INTERRUPT|SA_SAMPLE_RANDOM,
153						   "floppy", NULL);
154
155}
156
157static unsigned long dma_mem_alloc(unsigned long size)
158{
159	return __get_dma_pages(GFP_KERNEL,get_order(size));
160}
161
162
163static unsigned long vdma_mem_alloc(unsigned long size)
164{
165	return (unsigned long) vmalloc(size);
166
167}
168
169#define nodma_mem_alloc(size) vdma_mem_alloc(size)
170
171static void _fd_dma_mem_free(unsigned long addr, unsigned long size)
172{
173	if((unsigned long) addr >= (unsigned long) high_memory)
174		return vfree((void *)addr);
175	else
176		free_pages(addr, get_order(size));
177}
178
179#define fd_dma_mem_free(addr, size)  _fd_dma_mem_free(addr, size)
180
181static void _fd_chose_dma_mode(char *addr, unsigned long size)
182{
183	if(can_use_virtual_dma == 2) {
184		if((unsigned long) addr >= (unsigned long) high_memory ||
185		   virt_to_bus(addr) >= 0x1000000 ||
186		   _CROSS_64KB(addr, size, 0))
187			use_virtual_dma = 1;
188		else
189			use_virtual_dma = 0;
190	} else {
191		use_virtual_dma = can_use_virtual_dma & 1;
192	}
193}
194
195#define fd_chose_dma_mode(addr, size) _fd_chose_dma_mode(addr, size)
196
197
198static int vdma_dma_setup(char *addr, unsigned long size, int mode, int io)
199{
200	doing_pdma = 1;
201	virtual_dma_port = io;
202	virtual_dma_mode = (mode  == DMA_MODE_WRITE);
203	virtual_dma_addr = addr;
204	virtual_dma_count = size;
205	virtual_dma_residue = 0;
206	return 0;
207}
208
209static int hard_dma_setup(char *addr, unsigned long size, int mode, int io)
210{
211#ifdef FLOPPY_SANITY_CHECK
212	if (CROSS_64KB(addr, size)) {
213		printk("DMA crossing 64-K boundary %p-%p\n", addr, addr+size);
214		return -1;
215	}
216#endif
217	/* actual, physical DMA */
218	doing_pdma = 0;
219	clear_dma_ff(FLOPPY_DMA);
220	set_dma_mode(FLOPPY_DMA,mode);
221	set_dma_addr(FLOPPY_DMA,virt_to_bus(addr));
222	set_dma_count(FLOPPY_DMA,size);
223	enable_dma(FLOPPY_DMA);
224	return 0;
225}
226
227struct fd_routine_l {
228	int (*_request_dma)(unsigned int dmanr, const char * device_id);
229	void (*_free_dma)(unsigned int dmanr);
230	int (*_get_dma_residue)(unsigned int dummy);
231	unsigned long (*_dma_mem_alloc) (unsigned long size);
232	int (*_dma_setup)(char *addr, unsigned long size, int mode, int io);
233} fd_routine[] = {
234	{
235		request_dma,
236		free_dma,
237		get_dma_residue,
238		dma_mem_alloc,
239		hard_dma_setup
240	},
241	{
242		vdma_request_dma,
243		vdma_nop,
244		vdma_get_dma_residue,
245		vdma_mem_alloc,
246		vdma_dma_setup
247	}
248};
249
250
251static int FDC1 = 0x3f0;
252static int FDC2 = -1;
253
254/*
255 * Floppy types are stored in the rtc's CMOS RAM and so rtc_lock
256 * is needed to prevent corrupted CMOS RAM in case "insmod floppy"
257 * coincides with another rtc CMOS user.		Paul G.
258 */
259#define FLOPPY0_TYPE	({				\
260	unsigned long flags;				\
261	unsigned char val;				\
262	spin_lock_irqsave(&rtc_lock, flags);		\
263	val = (CMOS_READ(0x10) >> 4) & 15;		\
264	spin_unlock_irqrestore(&rtc_lock, flags);	\
265	val;						\
266})
267
268#define FLOPPY1_TYPE	({				\
269	unsigned long flags;				\
270	unsigned char val;				\
271	spin_lock_irqsave(&rtc_lock, flags);		\
272	val = CMOS_READ(0x10) & 15;			\
273	spin_unlock_irqrestore(&rtc_lock, flags);	\
274	val;						\
275})
276
277#define N_FDC 2
278#define N_DRIVE 8
279
280#define FLOPPY_MOTOR_MASK 0xf0
281
282#define AUTO_DMA
283
284#define EXTRA_FLOPPY_PARAMS
285
286#endif /* __ASM_X86_64_FLOPPY_H */
287