[net-next-2.6.git] / include / asm-i386 / floppy.h

/*
 * Architecture specific parts of the Floppy driver
 *
 * This file is subject to the terms and conditions of the GNU General Public
 * License.  See the file "COPYING" in the main directory of this archive
 * for more details.
 *
 * Copyright (C) 1995
 */
#ifndef __ASM_I386_FLOPPY_H
#define __ASM_I386_FLOPPY_H

#include <linux/vmalloc.h>


/*
 * The DMA channel used by the floppy controller cannot access data at
 * addresses >= 16MB
 *
 * Went back to the 1MB limit, as some people had problems with the floppy
 * driver otherwise. It doesn't matter much for performance anyway, as most
 * floppy accesses go through the track buffer.
 */
#define _CROSS_64KB(a,s,vdma) \
(!(vdma) && ((unsigned long)(a)/K_64 != ((unsigned long)(a) + (s) - 1) / K_64))

#define CROSS_64KB(a,s) _CROSS_64KB(a,s,use_virtual_dma & 1)


#define SW fd_routine[use_virtual_dma&1]
#define CSW fd_routine[can_use_virtual_dma & 1]


#define fd_inb(port)			inb_p(port)
#define fd_outb(value,port)		outb_p(value,port)

#define fd_request_dma()        CSW._request_dma(FLOPPY_DMA,"floppy")
#define fd_free_dma()           CSW._free_dma(FLOPPY_DMA)
#define fd_enable_irq()         enable_irq(FLOPPY_IRQ)
#define fd_disable_irq()        disable_irq(FLOPPY_IRQ)
#define fd_free_irq()		free_irq(FLOPPY_IRQ, NULL)
#define fd_get_dma_residue()    SW._get_dma_residue(FLOPPY_DMA)
#define fd_dma_mem_alloc(size)	SW._dma_mem_alloc(size)
#define fd_dma_setup(addr, size, mode, io) SW._dma_setup(addr, size, mode, io)

#define FLOPPY_CAN_FALLBACK_ON_NODMA

static int virtual_dma_count;
static int virtual_dma_residue;
static char *virtual_dma_addr;
static int virtual_dma_mode;
static int doing_pdma;

static irqreturn_t floppy_hardint(int irq, void *dev_id, struct pt_regs * regs)
{
	register unsigned char st;

#undef TRACE_FLPY_INT
#define NO_FLOPPY_ASSEMBLER

#ifdef TRACE_FLPY_INT
	static int calls=0;
	static int bytes=0;
	static int dma_wait=0;
#endif
	if (!doing_pdma)
		return floppy_interrupt(irq, dev_id, regs);

#ifdef TRACE_FLPY_INT
	if(!calls)
		bytes = virtual_dma_count;
#endif

#ifndef NO_FLOPPY_ASSEMBLER
	__asm__ (
       "testl %1,%1"
	"je 3f"
"1:	inb %w4,%b0"
	"andb $160,%b0"
	"cmpb $160,%b0"
	"jne 2f"
	"incw %w4"
	"testl %3,%3"
	"jne 4f"
	"inb %w4,%b0"
	"movb %0,(%2)"
	"jmp 5f"
"4:    	movb (%2),%0"
	"outb %b0,%w4"
"5:	decw %w4"
	"outb %0,$0x80"
	"decl %1"
	"incl %2"
	"testl %1,%1"
	"jne 1b"
"3:	inb %w4,%b0"
"2:	"
       : "=a" ((char) st), 
       "=c" ((long) virtual_dma_count), 
       "=S" ((long) virtual_dma_addr)
       : "b" ((long) virtual_dma_mode),
       "d" ((short) virtual_dma_port+4), 
       "1" ((long) virtual_dma_count),
       "2" ((long) virtual_dma_addr));
#else	
	{
		register int lcount;
		register char *lptr;

		st = 1;
		for(lcount=virtual_dma_count, lptr=virtual_dma_addr; 
		    lcount; lcount--, lptr++) {
			st=inb(virtual_dma_port+4) & 0xa0 ;
			if(st != 0xa0) 
				break;
			if(virtual_dma_mode)
				outb_p(*lptr, virtual_dma_port+5);
			else
				*lptr = inb_p(virtual_dma_port+5);
		}
		virtual_dma_count = lcount;
		virtual_dma_addr = lptr;
		st = inb(virtual_dma_port+4);
	}
#endif

#ifdef TRACE_FLPY_INT
	calls++;
#endif
	if(st == 0x20)
		return IRQ_HANDLED;
	if(!(st & 0x20)) {
		virtual_dma_residue += virtual_dma_count;
		virtual_dma_count=0;
#ifdef TRACE_FLPY_INT
		printk("count=%x, residue=%x calls=%d bytes=%d dma_wait=%d\n", 
		       virtual_dma_count, virtual_dma_residue, calls, bytes,
		       dma_wait);
		calls = 0;
		dma_wait=0;
#endif
		doing_pdma = 0;
		floppy_interrupt(irq, dev_id, regs);
		return IRQ_HANDLED;
	}
#ifdef TRACE_FLPY_INT
	if(!virtual_dma_count)
		dma_wait++;
#endif
	return IRQ_HANDLED;
}

static void fd_disable_dma(void)
{
	if(! (can_use_virtual_dma & 1))
		disable_dma(FLOPPY_DMA);
	doing_pdma = 0;
	virtual_dma_residue += virtual_dma_count;
	virtual_dma_count=0;
}

static int vdma_request_dma(unsigned int dmanr, const char * device_id)
{
	return 0;
}

static void vdma_nop(unsigned int dummy)
{
}


static int vdma_get_dma_residue(unsigned int dummy)
{
	return virtual_dma_count + virtual_dma_residue;
}


static int fd_request_irq(void)
{
	if(can_use_virtual_dma)
		return request_irq(FLOPPY_IRQ, floppy_hardint,SA_INTERRUPT,
						   "floppy", NULL);
	else
		return request_irq(FLOPPY_IRQ, floppy_interrupt,
						   SA_INTERRUPT|SA_SAMPLE_RANDOM,
						   "floppy", NULL);	

}

static unsigned long dma_mem_alloc(unsigned long size)
{
	return __get_dma_pages(GFP_KERNEL,get_order(size));
}


static unsigned long vdma_mem_alloc(unsigned long size)
{
	return (unsigned long) vmalloc(size);

}

#define nodma_mem_alloc(size) vdma_mem_alloc(size)

static void _fd_dma_mem_free(unsigned long addr, unsigned long size)
{
	if((unsigned int) addr >= (unsigned int) high_memory)
		vfree((void *)addr);
	else
		free_pages(addr, get_order(size));		
}

#define fd_dma_mem_free(addr, size)  _fd_dma_mem_free(addr, size) 

static void _fd_chose_dma_mode(char *addr, unsigned long size)
{
	if(can_use_virtual_dma == 2) {
		if((unsigned int) addr >= (unsigned int) high_memory ||
		   isa_virt_to_bus(addr) >= 0x1000000 ||
		   _CROSS_64KB(addr, size, 0))
			use_virtual_dma = 1;
		else
			use_virtual_dma = 0;
	} else {
		use_virtual_dma = can_use_virtual_dma & 1;
	}
}

#define fd_chose_dma_mode(addr, size) _fd_chose_dma_mode(addr, size)


static int vdma_dma_setup(char *addr, unsigned long size, int mode, int io)
{
	doing_pdma = 1;
	virtual_dma_port = io;
	virtual_dma_mode = (mode  == DMA_MODE_WRITE);
	virtual_dma_addr = addr;
	virtual_dma_count = size;
	virtual_dma_residue = 0;
	return 0;
}

static int hard_dma_setup(char *addr, unsigned long size, int mode, int io)
{
#ifdef FLOPPY_SANITY_CHECK
	if (CROSS_64KB(addr, size)) {
		printk("DMA crossing 64-K boundary %p-%p\n", addr, addr+size);
		return -1;
	}
#endif
	/* actual, physical DMA */
	doing_pdma = 0;
	clear_dma_ff(FLOPPY_DMA);
	set_dma_mode(FLOPPY_DMA,mode);
	set_dma_addr(FLOPPY_DMA,isa_virt_to_bus(addr));
	set_dma_count(FLOPPY_DMA,size);
	enable_dma(FLOPPY_DMA);
	return 0;
}

static struct fd_routine_l {
	int (*_request_dma)(unsigned int dmanr, const char * device_id);
	void (*_free_dma)(unsigned int dmanr);
	int (*_get_dma_residue)(unsigned int dummy);
	unsigned long (*_dma_mem_alloc) (unsigned long size);
	int (*_dma_setup)(char *addr, unsigned long size, int mode, int io);
} fd_routine[] = {
	{
		request_dma,
		free_dma,
		get_dma_residue,
		dma_mem_alloc,
		hard_dma_setup
	},
	{
		vdma_request_dma,
		vdma_nop,
		vdma_get_dma_residue,
		vdma_mem_alloc,
		vdma_dma_setup
	}
};


static int FDC1 = 0x3f0;
static int FDC2 = -1;

/*
 * Floppy types are stored in the rtc's CMOS RAM and so rtc_lock
 * is needed to prevent corrupted CMOS RAM in case "insmod floppy"
 * coincides with another rtc CMOS user.		Paul G.
 */
#define FLOPPY0_TYPE	({				\
	unsigned long flags;				\
	unsigned char val;				\
	spin_lock_irqsave(&rtc_lock, flags);		\
	val = (CMOS_READ(0x10) >> 4) & 15;		\
	spin_unlock_irqrestore(&rtc_lock, flags);	\
	val;						\
})

#define FLOPPY1_TYPE	({				\
	unsigned long flags;				\
	unsigned char val;				\
	spin_lock_irqsave(&rtc_lock, flags);		\
	val = CMOS_READ(0x10) & 15;			\
	spin_unlock_irqrestore(&rtc_lock, flags);	\
	val;						\
})

#define N_FDC 2
#define N_DRIVE 8

#define FLOPPY_MOTOR_MASK 0xf0

#define AUTO_DMA

#define EXTRA_FLOPPY_PARAMS

#endif /* __ASM_I386_FLOPPY_H */
Commit	Line	Data
1da177e4 LT	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_I386_FLOPPY_H
	11	#define __ASM_I386_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(value,port) outb_p(value,port)
	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
	48	static int virtual_dma_count;
	49	static int virtual_dma_residue;
	50	static char *virtual_dma_addr;
	51	static int virtual_dma_mode;
	52	static int doing_pdma;
	53
	54	static irqreturn_t 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	return floppy_interrupt(irq, dev_id, regs);
68
69	#ifdef TRACE_FLPY_INT
70	if(!calls)
71	bytes = virtual_dma_count;
72	#endif
73
74	#ifndef NO_FLOPPY_ASSEMBLER
75	__asm__ (
76	"testl %1,%1"
77	"je 3f"
78	"1: inb %w4,%b0"
79	"andb $160,%b0"
80	"cmpb $160,%b0"
81	"jne 2f"
82	"incw %w4"
83	"testl %3,%3"
84	"jne 4f"
85	"inb %w4,%b0"
86	"movb %0,(%2)"
87	"jmp 5f"
88	"4: movb (%2),%0"
89	"outb %b0,%w4"
90	"5: decw %w4"
91	"outb %0,$0x80"
92	"decl %1"
93	"incl %2"
94	"testl %1,%1"
95	"jne 1b"
96	"3: inb %w4,%b0"
97	"2: "
98	: "=a" ((char) st),
99	"=c" ((long) virtual_dma_count),
100	"=S" ((long) virtual_dma_addr)
101	: "b" ((long) virtual_dma_mode),
102	"d" ((short) virtual_dma_port+4),
103	"1" ((long) virtual_dma_count),
104	"2" ((long) virtual_dma_addr));
105	#else
106	{
107	register int lcount;
108	register char *lptr;
109
110	st = 1;
111	for(lcount=virtual_dma_count, lptr=virtual_dma_addr;
112	lcount; lcount--, lptr++) {
113	st=inb(virtual_dma_port+4) & 0xa0 ;
114	if(st != 0xa0)
115	break;
116	if(virtual_dma_mode)
117	outb_p(*lptr, virtual_dma_port+5);
118	else
119	*lptr = inb_p(virtual_dma_port+5);
120	}
121	virtual_dma_count = lcount;
122	virtual_dma_addr = lptr;
123	st = inb(virtual_dma_port+4);
124	}
125	#endif
126
127	#ifdef TRACE_FLPY_INT
128	calls++;
129	#endif
130	if(st == 0x20)
131	return IRQ_HANDLED;
132	if(!(st & 0x20)) {
133	virtual_dma_residue += virtual_dma_count;
134	virtual_dma_count=0;
135	#ifdef TRACE_FLPY_INT
136	printk("count=%x, residue=%x calls=%d bytes=%d dma_wait=%d\n",
137	virtual_dma_count, virtual_dma_residue, calls, bytes,
138	dma_wait);
139	calls = 0;
140	dma_wait=0;
141	#endif
142	doing_pdma = 0;
143	floppy_interrupt(irq, dev_id, regs);
144	return IRQ_HANDLED;
145	}
146	#ifdef TRACE_FLPY_INT
147	if(!virtual_dma_count)
148	dma_wait++;
149	#endif
150	return IRQ_HANDLED;
151	}
152
153	static void fd_disable_dma(void)
154	{
155	if(! (can_use_virtual_dma & 1))
156	disable_dma(FLOPPY_DMA);
157	doing_pdma = 0;
158	virtual_dma_residue += virtual_dma_count;
159	virtual_dma_count=0;
160	}
161
162	static int vdma_request_dma(unsigned int dmanr, const char * device_id)
163	{
164	return 0;
165	}
166
167	static void vdma_nop(unsigned int dummy)
168	{
169	}
170
171
172	static int vdma_get_dma_residue(unsigned int dummy)
173	{
174	return virtual_dma_count + virtual_dma_residue;
175	}
176
177
178	static int fd_request_irq(void)
179	{
180	if(can_use_virtual_dma)
181	return request_irq(FLOPPY_IRQ, floppy_hardint,SA_INTERRUPT,
182	"floppy", NULL);
183	else
184	return request_irq(FLOPPY_IRQ, floppy_interrupt,
185	SA_INTERRUPT\|SA_SAMPLE_RANDOM,
186	"floppy", NULL);
187
188	}
189
190	static unsigned long dma_mem_alloc(unsigned long size)
191	{
192	return __get_dma_pages(GFP_KERNEL,get_order(size));
193	}
194
195
196	static unsigned long vdma_mem_alloc(unsigned long size)
197	{
198	return (unsigned long) vmalloc(size);
199
200	}
201
202	#define nodma_mem_alloc(size) vdma_mem_alloc(size)
203
204	static void _fd_dma_mem_free(unsigned long addr, unsigned long size)
205	{
206	if((unsigned int) addr >= (unsigned int) high_memory)
207	vfree((void *)addr);
208	else
209	free_pages(addr, get_order(size));
210	}
211
212	#define fd_dma_mem_free(addr, size) _fd_dma_mem_free(addr, size)
213
214	static void _fd_chose_dma_mode(char *addr, unsigned long size)
215	{
216	if(can_use_virtual_dma == 2) {
217	if((unsigned int) addr >= (unsigned int) high_memory \|\|
218	isa_virt_to_bus(addr) >= 0x1000000 \|\|
219	_CROSS_64KB(addr, size, 0))
220	use_virtual_dma = 1;
221	else
222	use_virtual_dma = 0;
223	} else {
224	use_virtual_dma = can_use_virtual_dma & 1;
225	}
226	}
227
228	#define fd_chose_dma_mode(addr, size) _fd_chose_dma_mode(addr, size)
229
230
231	static int vdma_dma_setup(char *addr, unsigned long size, int mode, int io)
232	{
233	doing_pdma = 1;
234	virtual_dma_port = io;
235	virtual_dma_mode = (mode == DMA_MODE_WRITE);
236	virtual_dma_addr = addr;
237	virtual_dma_count = size;
238	virtual_dma_residue = 0;
239	return 0;
240	}
241
242	static int hard_dma_setup(char *addr, unsigned long size, int mode, int io)
243	{
244	#ifdef FLOPPY_SANITY_CHECK
245	if (CROSS_64KB(addr, size)) {
246	printk("DMA crossing 64-K boundary %p-%p\n", addr, addr+size);
247	return -1;
248	}
249	#endif
250	/* actual, physical DMA */
251	doing_pdma = 0;
252	clear_dma_ff(FLOPPY_DMA);
253	set_dma_mode(FLOPPY_DMA,mode);
254	set_dma_addr(FLOPPY_DMA,isa_virt_to_bus(addr));
255	set_dma_count(FLOPPY_DMA,size);
256	enable_dma(FLOPPY_DMA);
257	return 0;
258	}
259
75c96f85	260	static struct fd_routine_l {
1da177e4 LT	261	int (_request_dma)(unsigned int dmanr, const char device_id);
	262	void (*_free_dma)(unsigned int dmanr);
	263	int (*_get_dma_residue)(unsigned int dummy);
	264	unsigned long (*_dma_mem_alloc) (unsigned long size);
	265	int (_dma_setup)(char addr, unsigned long size, int mode, int io);
	266	} fd_routine[] = {
	267	{
	268	request_dma,
	269	free_dma,
	270	get_dma_residue,
	271	dma_mem_alloc,
	272	hard_dma_setup
	273	},
	274	{
	275	vdma_request_dma,
	276	vdma_nop,
	277	vdma_get_dma_residue,
	278	vdma_mem_alloc,
	279	vdma_dma_setup
	280	}
	281	};
	282
	283
	284	static int FDC1 = 0x3f0;
	285	static int FDC2 = -1;
	286
	287	/*
	288	* Floppy types are stored in the rtc's CMOS RAM and so rtc_lock
	289	* is needed to prevent corrupted CMOS RAM in case "insmod floppy"
	290	* coincides with another rtc CMOS user. Paul G.
	291	*/
	292	#define FLOPPY0_TYPE ({ \
	293	unsigned long flags; \
	294	unsigned char val; \
	295	spin_lock_irqsave(&rtc_lock, flags); \
	296	val = (CMOS_READ(0x10) >> 4) & 15; \
	297	spin_unlock_irqrestore(&rtc_lock, flags); \
	298	val; \
	299	})
	300
	301	#define FLOPPY1_TYPE ({ \
	302	unsigned long flags; \
	303	unsigned char val; \
	304	spin_lock_irqsave(&rtc_lock, flags); \
	305	val = CMOS_READ(0x10) & 15; \
	306	spin_unlock_irqrestore(&rtc_lock, flags); \
	307	val; \
	308	})
	309
	310	#define N_FDC 2
	311	#define N_DRIVE 8
	312
	313	#define FLOPPY_MOTOR_MASK 0xf0
	314
	315	#define AUTO_DMA
	316
	317	#define EXTRA_FLOPPY_PARAMS
	318
	319	#endif /* __ASM_I386_FLOPPY_H */