[linux-2.6-block.git] / arch / x86 / include / asm / 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)
{
	unsigned char st;

#undef TRACE_FLPY_INT

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

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

	{
		int lcount;
		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	*/
1965aae3 PA	10	#ifndef _ASM_X86_FLOPPY_H
1965aae3 PA	11	#define _ASM_X86_FLOPPY_H
b515e476 TG	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	*/
4637bc07 JP	23	#define _CROSS_64KB(a, s, vdma) \
	24	(!(vdma) && \
	25	((unsigned long)(a)/K_64 != ((unsigned long)(a) + (s) - 1) / K_64))
b515e476	26
4637bc07	27	#define CROSS_64KB(a, s) _CROSS_64KB(a, s, use_virtual_dma & 1)
b515e476 TG	28
b515e476 TG	29
4637bc07	30	#define SW fd_routine[use_virtual_dma & 1]
b515e476 TG	31	#define CSW fd_routine[can_use_virtual_dma & 1]
	32
	33
	34	#define fd_inb(port) inb_p(port)
4637bc07	35	#define fd_outb(value, port) outb_p(value, port)
b515e476	36
4637bc07	37	#define fd_request_dma() CSW._request_dma(FLOPPY_DMA, "floppy")
b515e476 TG	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)
	55	{
537e3313	56	unsigned char st;
b515e476 TG	57
	58	#undef TRACE_FLPY_INT
	59
	60	#ifdef TRACE_FLPY_INT
4637bc07 JP	61	static int calls;
	62	static int bytes;
	63	static int dma_wait;
96a388de	64	#endif
b515e476 TG	65	if (!doing_pdma)
	66	return floppy_interrupt(irq, dev_id);
	67
	68	#ifdef TRACE_FLPY_INT
4637bc07	69	if (!calls)
b515e476 TG	70	bytes = virtual_dma_count;
	71	#endif
	72
	73	{
537e3313 JJ	74	int lcount;
537e3313 JJ	75	char *lptr;
b515e476 TG	76
b515e476 TG	77	st = 1;
4637bc07 JP	78	for (lcount = virtual_dma_count, lptr = virtual_dma_addr;
	79	lcount; lcount--, lptr++) {
	80	st = inb(virtual_dma_port + 4) & 0xa0;
	81	if (st != 0xa0)
b515e476	82	break;
4637bc07 JP	83	if (virtual_dma_mode)
4637bc07 JP	84	outb_p(*lptr, virtual_dma_port + 5);
b515e476	85	else
4637bc07	86	*lptr = inb_p(virtual_dma_port + 5);
b515e476 TG	87	}
	88	virtual_dma_count = lcount;
	89	virtual_dma_addr = lptr;
4637bc07	90	st = inb(virtual_dma_port + 4);
b515e476 TG	91	}
	92
	93	#ifdef TRACE_FLPY_INT
	94	calls++;
	95	#endif
4637bc07	96	if (st == 0x20)
b515e476	97	return IRQ_HANDLED;
4637bc07	98	if (!(st & 0x20)) {
b515e476	99	virtual_dma_residue += virtual_dma_count;
4637bc07	100	virtual_dma_count = 0;
b515e476 TG	101	#ifdef TRACE_FLPY_INT
	102	printk("count=%x, residue=%x calls=%d bytes=%d dma_wait=%d\n",
	103	virtual_dma_count, virtual_dma_residue, calls, bytes,
	104	dma_wait);
	105	calls = 0;
4637bc07	106	dma_wait = 0;
b515e476 TG	107	#endif
	108	doing_pdma = 0;
	109	floppy_interrupt(irq, dev_id);
	110	return IRQ_HANDLED;
	111	}
	112	#ifdef TRACE_FLPY_INT
4637bc07	113	if (!virtual_dma_count)
b515e476 TG	114	dma_wait++;
	115	#endif
	116	return IRQ_HANDLED;
	117	}
	118
	119	static void fd_disable_dma(void)
	120	{
4637bc07	121	if (!(can_use_virtual_dma & 1))
b515e476 TG	122	disable_dma(FLOPPY_DMA);
	123	doing_pdma = 0;
	124	virtual_dma_residue += virtual_dma_count;
4637bc07	125	virtual_dma_count = 0;
b515e476 TG	126	}
b515e476 TG	127
4637bc07	128	static int vdma_request_dma(unsigned int dmanr, const char *device_id)
b515e476 TG	129	{
	130	return 0;
	131	}
	132
	133	static void vdma_nop(unsigned int dummy)
	134	{
	135	}
	136
	137
	138	static int vdma_get_dma_residue(unsigned int dummy)
	139	{
	140	return virtual_dma_count + virtual_dma_residue;
	141	}
	142
	143
	144	static int fd_request_irq(void)
	145	{
4637bc07	146	if (can_use_virtual_dma)
b515e476 TG	147	return request_irq(FLOPPY_IRQ, floppy_hardint,
	148	IRQF_DISABLED, "floppy", NULL);
	149	else
	150	return request_irq(FLOPPY_IRQ, floppy_interrupt,
	151	IRQF_DISABLED, "floppy", NULL);
	152	}
	153
	154	static unsigned long dma_mem_alloc(unsigned long size)
	155	{
4637bc07	156	return __get_dma_pages(GFP_KERNEL\|__GFP_NORETRY, get_order(size));
b515e476 TG	157	}
	158
	159
	160	static unsigned long vdma_mem_alloc(unsigned long size)
	161	{
4637bc07	162	return (unsigned long)vmalloc(size);
b515e476 TG	163
	164	}
	165
	166	#define nodma_mem_alloc(size) vdma_mem_alloc(size)
	167
	168	static void _fd_dma_mem_free(unsigned long addr, unsigned long size)
	169	{
4637bc07	170	if ((unsigned long)addr >= (unsigned long)high_memory)
b515e476 TG	171	vfree((void *)addr);
	172	else
	173	free_pages(addr, get_order(size));
	174	}
	175
	176	#define fd_dma_mem_free(addr, size) _fd_dma_mem_free(addr, size)
	177
	178	static void _fd_chose_dma_mode(char *addr, unsigned long size)
	179	{
4637bc07 JP	180	if (can_use_virtual_dma == 2) {
	181	if ((unsigned long)addr >= (unsigned long)high_memory \|\|
	182	isa_virt_to_bus(addr) >= 0x1000000 \|\|
	183	_CROSS_64KB(addr, size, 0))
b515e476 TG	184	use_virtual_dma = 1;
	185	else
	186	use_virtual_dma = 0;
	187	} else {
	188	use_virtual_dma = can_use_virtual_dma & 1;
	189	}
	190	}
	191
	192	#define fd_chose_dma_mode(addr, size) _fd_chose_dma_mode(addr, size)
	193
	194
	195	static int vdma_dma_setup(char *addr, unsigned long size, int mode, int io)
	196	{
	197	doing_pdma = 1;
	198	virtual_dma_port = io;
4637bc07	199	virtual_dma_mode = (mode == DMA_MODE_WRITE);
b515e476 TG	200	virtual_dma_addr = addr;
	201	virtual_dma_count = size;
	202	virtual_dma_residue = 0;
	203	return 0;
	204	}
	205
	206	static int hard_dma_setup(char *addr, unsigned long size, int mode, int io)
	207	{
	208	#ifdef FLOPPY_SANITY_CHECK
	209	if (CROSS_64KB(addr, size)) {
	210	printk("DMA crossing 64-K boundary %p-%p\n", addr, addr+size);
	211	return -1;
	212	}
	213	#endif
	214	/* actual, physical DMA */
	215	doing_pdma = 0;
	216	clear_dma_ff(FLOPPY_DMA);
4637bc07 JP	217	set_dma_mode(FLOPPY_DMA, mode);
	218	set_dma_addr(FLOPPY_DMA, isa_virt_to_bus(addr));
	219	set_dma_count(FLOPPY_DMA, size);
b515e476 TG	220	enable_dma(FLOPPY_DMA);
	221	return 0;
	222	}
	223
	224	static struct fd_routine_l {
4637bc07	225	int (_request_dma)(unsigned int dmanr, const char device_id);
b515e476 TG	226	void (*_free_dma)(unsigned int dmanr);
b515e476 TG	227	int (*_get_dma_residue)(unsigned int dummy);
4637bc07	228	unsigned long (*_dma_mem_alloc)(unsigned long size);
b515e476 TG	229	int (_dma_setup)(char addr, unsigned long size, int mode, int io);
	230	} fd_routine[] = {
	231	{
	232	request_dma,
	233	free_dma,
	234	get_dma_residue,
	235	dma_mem_alloc,
	236	hard_dma_setup
	237	},
	238	{
	239	vdma_request_dma,
	240	vdma_nop,
	241	vdma_get_dma_residue,
	242	vdma_mem_alloc,
	243	vdma_dma_setup
	244	}
	245	};
	246
	247
	248	static int FDC1 = 0x3f0;
	249	static int FDC2 = -1;
	250
	251	/*
	252	* Floppy types are stored in the rtc's CMOS RAM and so rtc_lock
	253	* is needed to prevent corrupted CMOS RAM in case "insmod floppy"
	254	* coincides with another rtc CMOS user. Paul G.
	255	*/
4637bc07 JP	256	#define FLOPPY0_TYPE \
4637bc07 JP	257	({ \
b515e476 TG	258	unsigned long flags; \
	259	unsigned char val; \
	260	spin_lock_irqsave(&rtc_lock, flags); \
	261	val = (CMOS_READ(0x10) >> 4) & 15; \
	262	spin_unlock_irqrestore(&rtc_lock, flags); \
	263	val; \
	264	})
	265
4637bc07 JP	266	#define FLOPPY1_TYPE \
4637bc07 JP	267	({ \
b515e476 TG	268	unsigned long flags; \
	269	unsigned char val; \
	270	spin_lock_irqsave(&rtc_lock, flags); \
	271	val = CMOS_READ(0x10) & 15; \
	272	spin_unlock_irqrestore(&rtc_lock, flags); \
	273	val; \
	274	})
	275
	276	#define N_FDC 2
	277	#define N_DRIVE 8
	278
	279	#define EXTRA_FLOPPY_PARAMS
	280
1965aae3	281	#endif /* _ASM_X86_FLOPPY_H */