[deliverable/linux.git] / include / asm-x86 / 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_X86_FLOPPY_H
#define _ASM_X86_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)
{
	register unsigned char st;

#undef TRACE_FLPY_INT

#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);

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

	{
		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);
	}

#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);
		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,
				   IRQF_DISABLED, "floppy", NULL);
	else
		return request_irq(FLOPPY_IRQ, floppy_interrupt,
				   IRQF_DISABLED, "floppy", NULL);
}

static unsigned long dma_mem_alloc(unsigned long size)
{
	return __get_dma_pages(GFP_KERNEL|__GFP_NORETRY,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 long) addr >= (unsigned long) 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 long) addr >= (unsigned long) 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 EXTRA_FLOPPY_PARAMS

#endif /* _ASM_X86_FLOPPY_H */
Commit	Line	Data
b515e476 TG	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_FLOPPY_H
	11	#define _ASM_X86_FLOPPY_H
	12
	13	#include <linux/vmalloc.h>
	14
	15	/*
	16	* The DMA channel used by the floppy controller cannot access data at
	17	* addresses >= 16MB
	18	*
	19	* Went back to the 1MB limit, as some people had problems with the floppy
	20	* driver otherwise. It doesn't matter much for performance anyway, as most
	21	* floppy accesses go through the track buffer.
	22	*/
	23	#define _CROSS_64KB(a,s,vdma) \
	24	(!(vdma) && ((unsigned long)(a)/K_64 != ((unsigned long)(a) + (s) - 1) / K_64))
	25
	26	#define CROSS_64KB(a,s) _CROSS_64KB(a,s,use_virtual_dma & 1)
	27
	28
	29	#define SW fd_routine[use_virtual_dma&1]
	30	#define CSW fd_routine[can_use_virtual_dma & 1]
	31
	32
	33	#define fd_inb(port) inb_p(port)
	34	#define fd_outb(value,port) outb_p(value,port)
	35
	36	#define fd_request_dma() CSW._request_dma(FLOPPY_DMA,"floppy")
	37	#define fd_free_dma() CSW._free_dma(FLOPPY_DMA)
	38	#define fd_enable_irq() enable_irq(FLOPPY_IRQ)
	39	#define fd_disable_irq() disable_irq(FLOPPY_IRQ)
	40	#define fd_free_irq() free_irq(FLOPPY_IRQ, NULL)
	41	#define fd_get_dma_residue() SW._get_dma_residue(FLOPPY_DMA)
	42	#define fd_dma_mem_alloc(size) SW._dma_mem_alloc(size)
	43	#define fd_dma_setup(addr, size, mode, io) SW._dma_setup(addr, size, mode, io)
	44
	45	#define FLOPPY_CAN_FALLBACK_ON_NODMA
	46
	47	static int virtual_dma_count;
	48	static int virtual_dma_residue;
	49	static char *virtual_dma_addr;
	50	static int virtual_dma_mode;
	51	static int doing_pdma;
	52
	53	static irqreturn_t floppy_hardint(int irq, void *dev_id)
	54	{
	55	register unsigned char st;
	56
	57	#undef TRACE_FLPY_INT
	58
	59	#ifdef TRACE_FLPY_INT
	60	static int calls=0;
	61	static int bytes=0;
	62	static int dma_wait=0;
96a388de	63	#endif
b515e476 TG	64	if (!doing_pdma)
	65	return floppy_interrupt(irq, dev_id);
	66
	67	#ifdef TRACE_FLPY_INT
	68	if(!calls)
	69	bytes = virtual_dma_count;
	70	#endif
	71
	72	{
	73	register int lcount;
	74	register char *lptr;
	75
	76	st = 1;
	77	for(lcount=virtual_dma_count, lptr=virtual_dma_addr;
	78	lcount; lcount--, lptr++) {
	79	st=inb(virtual_dma_port+4) & 0xa0 ;
	80	if(st != 0xa0)
	81	break;
	82	if(virtual_dma_mode)
	83	outb_p(*lptr, virtual_dma_port+5);
	84	else
	85	*lptr = inb_p(virtual_dma_port+5);
	86	}
	87	virtual_dma_count = lcount;
	88	virtual_dma_addr = lptr;
	89	st = inb(virtual_dma_port+4);
	90	}
	91
	92	#ifdef TRACE_FLPY_INT
	93	calls++;
	94	#endif
	95	if(st == 0x20)
	96	return IRQ_HANDLED;
	97	if(!(st & 0x20)) {
	98	virtual_dma_residue += virtual_dma_count;
	99	virtual_dma_count=0;
	100	#ifdef TRACE_FLPY_INT
	101	printk("count=%x, residue=%x calls=%d bytes=%d dma_wait=%d\n",
	102	virtual_dma_count, virtual_dma_residue, calls, bytes,
	103	dma_wait);
	104	calls = 0;
	105	dma_wait=0;
	106	#endif
	107	doing_pdma = 0;
	108	floppy_interrupt(irq, dev_id);
	109	return IRQ_HANDLED;
	110	}
	111	#ifdef TRACE_FLPY_INT
	112	if(!virtual_dma_count)
	113	dma_wait++;
	114	#endif
	115	return IRQ_HANDLED;
	116	}
	117
	118	static void fd_disable_dma(void)
	119	{
	120	if(! (can_use_virtual_dma & 1))
	121	disable_dma(FLOPPY_DMA);
	122	doing_pdma = 0;
	123	virtual_dma_residue += virtual_dma_count;
	124	virtual_dma_count=0;
	125	}
	126
	127	static int vdma_request_dma(unsigned int dmanr, const char * device_id)
128	{
129	return 0;
130	}
131
132	static void vdma_nop(unsigned int dummy)
133	{
134	}
135
136
137	static int vdma_get_dma_residue(unsigned int dummy)
138	{
139	return virtual_dma_count + virtual_dma_residue;
140	}
141
142
143	static int fd_request_irq(void)
144	{
145	if(can_use_virtual_dma)
146	return request_irq(FLOPPY_IRQ, floppy_hardint,
147	IRQF_DISABLED, "floppy", NULL);
148	else
149	return request_irq(FLOPPY_IRQ, floppy_interrupt,
150	IRQF_DISABLED, "floppy", NULL);
151	}
152
153	static unsigned long dma_mem_alloc(unsigned long size)
154	{
155	return __get_dma_pages(GFP_KERNEL\|__GFP_NORETRY,get_order(size));
156	}
157
158
159	static unsigned long vdma_mem_alloc(unsigned long size)
160	{
161	return (unsigned long) vmalloc(size);
162
163	}
164
165	#define nodma_mem_alloc(size) vdma_mem_alloc(size)
166
167	static void _fd_dma_mem_free(unsigned long addr, unsigned long size)
168	{
169	if((unsigned long) addr >= (unsigned long) high_memory)
170	vfree((void *)addr);
171	else
172	free_pages(addr, get_order(size));
173	}
174
175	#define fd_dma_mem_free(addr, size) _fd_dma_mem_free(addr, size)
176
177	static void _fd_chose_dma_mode(char *addr, unsigned long size)
178	{
179	if(can_use_virtual_dma == 2) {
180	if((unsigned long) addr >= (unsigned long) high_memory \|\|
181	isa_virt_to_bus(addr) >= 0x1000000 \|\|
182	_CROSS_64KB(addr, size, 0))
183	use_virtual_dma = 1;
184	else
185	use_virtual_dma = 0;
186	} else {
187	use_virtual_dma = can_use_virtual_dma & 1;
188	}
189	}
190
191	#define fd_chose_dma_mode(addr, size) _fd_chose_dma_mode(addr, size)
192
193
194	static int vdma_dma_setup(char *addr, unsigned long size, int mode, int io)
195	{
196	doing_pdma = 1;
197	virtual_dma_port = io;
198	virtual_dma_mode = (mode == DMA_MODE_WRITE);
199	virtual_dma_addr = addr;
200	virtual_dma_count = size;
201	virtual_dma_residue = 0;
202	return 0;
203	}
204
205	static int hard_dma_setup(char *addr, unsigned long size, int mode, int io)
206	{
207	#ifdef FLOPPY_SANITY_CHECK
208	if (CROSS_64KB(addr, size)) {
209	printk("DMA crossing 64-K boundary %p-%p\n", addr, addr+size);
210	return -1;
211	}
212	#endif
213	/* actual, physical DMA */
214	doing_pdma = 0;
215	clear_dma_ff(FLOPPY_DMA);
216	set_dma_mode(FLOPPY_DMA,mode);
217	set_dma_addr(FLOPPY_DMA,isa_virt_to_bus(addr));
218	set_dma_count(FLOPPY_DMA,size);
219	enable_dma(FLOPPY_DMA);
220	return 0;
221	}
222
223	static struct fd_routine_l {
224	int (_request_dma)(unsigned int dmanr, const char device_id);
225	void (*_free_dma)(unsigned int dmanr);
226	int (*_get_dma_residue)(unsigned int dummy);
227	unsigned long (*_dma_mem_alloc) (unsigned long size);
228	int (_dma_setup)(char addr, unsigned long size, int mode, int io);
229	} fd_routine[] = {
230	{
231	request_dma,
232	free_dma,
233	get_dma_residue,
234	dma_mem_alloc,
235	hard_dma_setup
236	},
237	{
238	vdma_request_dma,
239	vdma_nop,
240	vdma_get_dma_residue,
241	vdma_mem_alloc,
242	vdma_dma_setup
243	}
244	};
245
246
247	static int FDC1 = 0x3f0;
248	static int FDC2 = -1;
249
250	/*
251	* Floppy types are stored in the rtc's CMOS RAM and so rtc_lock
252	* is needed to prevent corrupted CMOS RAM in case "insmod floppy"
253	* coincides with another rtc CMOS user. Paul G.
254	*/
255	#define FLOPPY0_TYPE ({ \
256	unsigned long flags; \
257	unsigned char val; \
258	spin_lock_irqsave(&rtc_lock, flags); \
259	val = (CMOS_READ(0x10) >> 4) & 15; \
260	spin_unlock_irqrestore(&rtc_lock, flags); \
261	val; \
262	})
263
264	#define FLOPPY1_TYPE ({ \
265	unsigned long flags; \
266	unsigned char val; \
267	spin_lock_irqsave(&rtc_lock, flags); \
268	val = CMOS_READ(0x10) & 15; \
269	spin_unlock_irqrestore(&rtc_lock, flags); \
270	val; \
271	})
272
273	#define N_FDC 2
274	#define N_DRIVE 8
275
276	#define EXTRA_FLOPPY_PARAMS
277
278	#endif /* _ASM_X86_FLOPPY_H */