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_PARISC_FLOPPY_H
11#define __ASM_PARISC_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=0;
49static int virtual_dma_residue=0;
50static char *virtual_dma_addr=0;
51static int virtual_dma_mode=0;
52static int doing_pdma=0;
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#define NO_FLOPPY_ASSEMBLER
60
61#ifdef TRACE_FLPY_INT
62	static int calls=0;
63	static int bytes=0;
64	static int dma_wait=0;
65#endif
66	if(!doing_pdma) {
67		floppy_interrupt(irq, dev_id, regs);
68		return;
69	}
70
71#ifdef TRACE_FLPY_INT
72	if(!calls)
73		bytes = virtual_dma_count;
74#endif
75
76	{
77		register int lcount;
78		register char *lptr;
79
80		st = 1;
81		for(lcount=virtual_dma_count, lptr=virtual_dma_addr;
82		    lcount; lcount--, lptr++) {
83			st=inb(virtual_dma_port+4) & 0xa0 ;
84			if(st != 0xa0)
85				break;
86			if(virtual_dma_mode)
87				outb_p(*lptr, virtual_dma_port+5);
88			else
89				*lptr = inb_p(virtual_dma_port+5);
90		}
91		virtual_dma_count = lcount;
92		virtual_dma_addr = lptr;
93		st = inb(virtual_dma_port+4);
94	}
95
96#ifdef TRACE_FLPY_INT
97	calls++;
98#endif
99	if(st == 0x20)
100		return;
101	if(!(st & 0x20)) {
102		virtual_dma_residue += virtual_dma_count;
103		virtual_dma_count=0;
104#ifdef TRACE_FLPY_INT
105		printk("count=%x, residue=%x calls=%d bytes=%d dma_wait=%d\n",
106		       virtual_dma_count, virtual_dma_residue, calls, bytes,
107		       dma_wait);
108		calls = 0;
109		dma_wait=0;
110#endif
111		doing_pdma = 0;
112		floppy_interrupt(irq, dev_id, regs);
113		return;
114	}
115#ifdef TRACE_FLPY_INT
116	if(!virtual_dma_count)
117		dma_wait++;
118#endif
119}
120
121static void fd_disable_dma(void)
122{
123	if(! (can_use_virtual_dma & 1))
124		disable_dma(FLOPPY_DMA);
125	doing_pdma = 0;
126	virtual_dma_residue += virtual_dma_count;
127	virtual_dma_count=0;
128}
129
130static int vdma_request_dma(unsigned int dmanr, const char * device_id)
131{
132	return 0;
133}
134
135static void vdma_nop(unsigned int dummy)
136{
137}
138
139
140static int vdma_get_dma_residue(unsigned int dummy)
141{
142	return virtual_dma_count + virtual_dma_residue;
143}
144
145
146static int fd_request_irq(void)
147{
148	if(can_use_virtual_dma)
149		return request_irq(FLOPPY_IRQ, floppy_hardint,SA_INTERRUPT,
150						   "floppy", NULL);
151	else
152		return request_irq(FLOPPY_IRQ, floppy_interrupt,
153						   SA_INTERRUPT|SA_SAMPLE_RANDOM,
154						   "floppy", NULL);
155
156}
157
158static unsigned long dma_mem_alloc(unsigned long size)
159{
160	return __get_dma_pages(GFP_KERNEL,__get_order(size));
161}
162
163
164static unsigned long vdma_mem_alloc(unsigned long size)
165{
166	return (unsigned long) vmalloc(size);
167
168}
169
170#define nodma_mem_alloc(size) vdma_mem_alloc(size)
171
172static void _fd_dma_mem_free(unsigned long addr, unsigned long size)
173{
174	if((unsigned int) addr >= (unsigned int) high_memory)
175		return vfree((void *)addr);
176	else
177		free_pages(addr, __get_order(size));
178}
179
180#define fd_dma_mem_free(addr, size)  _fd_dma_mem_free(addr, size)
181
182static void _fd_chose_dma_mode(char *addr, unsigned long size)
183{
184	if(can_use_virtual_dma == 2) {
185		if((unsigned int) addr >= (unsigned int) high_memory ||
186		   virt_to_bus(addr) >= 0x1000000 ||
187		   _CROSS_64KB(addr, size, 0))
188			use_virtual_dma = 1;
189		else
190			use_virtual_dma = 0;
191	} else {
192		use_virtual_dma = can_use_virtual_dma & 1;
193	}
194}
195
196#define fd_chose_dma_mode(addr, size) _fd_chose_dma_mode(addr, size)
197
198
199static int vdma_dma_setup(char *addr, unsigned long size, int mode, int io)
200{
201	doing_pdma = 1;
202	virtual_dma_port = io;
203	virtual_dma_mode = (mode  == DMA_MODE_WRITE);
204	virtual_dma_addr = addr;
205	virtual_dma_count = size;
206	virtual_dma_residue = 0;
207	return 0;
208}
209
210static int hard_dma_setup(char *addr, unsigned long size, int mode, int io)
211{
212#ifdef FLOPPY_SANITY_CHECK
213	if (CROSS_64KB(addr, size)) {
214		printk("DMA crossing 64-K boundary %p-%p\n", addr, addr+size);
215		return -1;
216	}
217#endif
218	/* actual, physical DMA */
219	doing_pdma = 0;
220	clear_dma_ff(FLOPPY_DMA);
221	set_dma_mode(FLOPPY_DMA,mode);
222	set_dma_addr(FLOPPY_DMA,virt_to_bus(addr));
223	set_dma_count(FLOPPY_DMA,size);
224	enable_dma(FLOPPY_DMA);
225	return 0;
226}
227
228struct fd_routine_l {
229	int (*_request_dma)(unsigned int dmanr, const char * device_id);
230	void (*_free_dma)(unsigned int dmanr);
231	int (*_get_dma_residue)(unsigned int dummy);
232	unsigned long (*_dma_mem_alloc) (unsigned long size);
233	int (*_dma_setup)(char *addr, unsigned long size, int mode, int io);
234} fd_routine[] = {
235	{
236		request_dma,
237		free_dma,
238		get_dma_residue,
239		dma_mem_alloc,
240		hard_dma_setup
241	},
242	{
243		vdma_request_dma,
244		vdma_nop,
245		vdma_get_dma_residue,
246		vdma_mem_alloc,
247		vdma_dma_setup
248	}
249};
250
251
252static int FDC1 = 0x3f0;
253static int FDC2 = -1;
254
255#define FLOPPY0_TYPE	((CMOS_READ(0x10) >> 4) & 15)
256#define FLOPPY1_TYPE	(CMOS_READ(0x10) & 15)
257
258#define N_FDC 1
259#define N_DRIVE 8
260
261#define FLOPPY_MOTOR_MASK 0xf0
262
263#define AUTO_DMA
264
265
266#endif /* __ASM_PARISC_FLOPPY_H */
267