[deliverable/linux.git] / include / asm-sh / floppy.h

/*
 * Architecture specific parts of the Floppy driver
 *   include/asm-i386/floppy.h
 *
 * 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_SH_FLOPPY_H
#define __ASM_SH_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 void floppy_hardint(int irq, void *dev_id, struct pt_regs * regs)
{
	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) {
		floppy_interrupt(irq, dev_id, regs);
		return;
	}

#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;
	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;
	}
#ifdef TRACE_FLPY_INT
	if(!virtual_dma_count)
		dma_wait++;
#endif
}

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,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)
		return 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 ||
		   virt_to_bus(addr) >= 0x10000000)
			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

	dma_cache_wback_inv(addr, size);

	/* actual, physical DMA */
	doing_pdma = 0;
	clear_dma_ff(FLOPPY_DMA);
	set_dma_mode(FLOPPY_DMA,mode);
	set_dma_addr(FLOPPY_DMA,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	(4)
#define FLOPPY1_TYPE	(0)

#define N_FDC 2
#define N_DRIVE 8

#define FLOPPY_MOTOR_MASK 0xf0

#define AUTO_DMA

#define EXTRA_FLOPPY_PARAMS

#endif /* __ASM_SH_FLOPPY_H */
Commit	Line	Data
1da177e4 LT	1	/*
	2	* Architecture specific parts of the Floppy driver
	3	* include/asm-i386/floppy.h
	4	*
	5	* This file is subject to the terms and conditions of the GNU General Public
	6	* License. See the file "COPYING" in the main directory of this archive
	7	* for more details.
	8	*
	9	* Copyright (C) 1995
	10	*/
	11	#ifndef __ASM_SH_FLOPPY_H
	12	#define __ASM_SH_FLOPPY_H
	13
	14	#include <linux/vmalloc.h>
	15
	16
	17	/*
	18	* The DMA channel used by the floppy controller cannot access data at
	19	* addresses >= 16MB
	20	*
	21	* Went back to the 1MB limit, as some people had problems with the floppy
	22	* driver otherwise. It doesn't matter much for performance anyway, as most
	23	* floppy accesses go through the track buffer.
	24	*/
	25	#define _CROSS_64KB(a,s,vdma) \
	26	(!vdma && ((unsigned long)(a)/K_64 != ((unsigned long)(a) + (s) - 1) / K_64))
	27
	28	#define CROSS_64KB(a,s) _CROSS_64KB(a,s,use_virtual_dma & 1)
	29
	30
	31	#define SW fd_routine[use_virtual_dma&1]
	32	#define CSW fd_routine[can_use_virtual_dma & 1]
	33
	34
	35	#define fd_inb(port) inb_p(port)
	36	#define fd_outb(value,port) outb_p(value,port)
	37
	38	#define fd_request_dma() CSW._request_dma(FLOPPY_DMA,"floppy")
	39	#define fd_free_dma() CSW._free_dma(FLOPPY_DMA)
	40	#define fd_enable_irq() enable_irq(FLOPPY_IRQ)
	41	#define fd_disable_irq() disable_irq(FLOPPY_IRQ)
	42	#define fd_free_irq() free_irq(FLOPPY_IRQ, NULL)
	43	#define fd_get_dma_residue() SW._get_dma_residue(FLOPPY_DMA)
	44	#define fd_dma_mem_alloc(size) SW._dma_mem_alloc(size)
	45	#define fd_dma_setup(addr, size, mode, io) SW._dma_setup(addr, size, mode, io)
	46
	47	#define FLOPPY_CAN_FALLBACK_ON_NODMA
	48
	49	static int virtual_dma_count;
	50	static int virtual_dma_residue;
	51	static char *virtual_dma_addr;
	52	static int virtual_dma_mode;
	53	static int doing_pdma;
	54
	55	static void floppy_hardint(int irq, void dev_id, struct pt_regs regs)
	56	{
	57	register unsigned char st;
	58
	59	#undef TRACE_FLPY_INT
	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
121	static 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
130	static int vdma_request_dma(unsigned int dmanr, const char * device_id)
131	{
132	return 0;
133	}
134
135	static void vdma_nop(unsigned int dummy)
136	{
137	}
138
139
140	static int vdma_get_dma_residue(unsigned int dummy)
141	{
142	return virtual_dma_count + virtual_dma_residue;
143	}
144
145
146	static int fd_request_irq(void)
147	{
148	if(can_use_virtual_dma)
6d20819f TG	149	return request_irq(FLOPPY_IRQ, floppy_hardint,
6d20819f TG	150	IRQF_DISABLED, "floppy", NULL);
1da177e4	151	else
6d20819f TG	152	return request_irq(FLOPPY_IRQ, floppy_interrupt,
6d20819f TG	153	IRQF_DISABLED, "floppy", NULL);
1da177e4 LT	154	}
	155
	156	static unsigned long dma_mem_alloc(unsigned long size)
	157	{
	158	return __get_dma_pages(GFP_KERNEL,get_order(size));
	159	}
	160
	161
	162	static unsigned long vdma_mem_alloc(unsigned long size)
	163	{
	164	return (unsigned long) vmalloc(size);
	165
	166	}
	167
	168	#define nodma_mem_alloc(size) vdma_mem_alloc(size)
	169
	170	static void _fd_dma_mem_free(unsigned long addr, unsigned long size)
	171	{
	172	if((unsigned int) addr >= (unsigned int) high_memory)
	173	return vfree((void *)addr);
	174	else
	175	free_pages(addr, get_order(size));
	176	}
	177
	178	#define fd_dma_mem_free(addr, size) _fd_dma_mem_free(addr, size)
	179
	180	static void _fd_chose_dma_mode(char *addr, unsigned long size)
	181	{
	182	if(can_use_virtual_dma == 2) {
	183	if((unsigned int) addr >= (unsigned int) high_memory \|\|
	184	virt_to_bus(addr) >= 0x10000000)
	185	use_virtual_dma = 1;
	186	else
	187	use_virtual_dma = 0;
	188	} else {
	189	use_virtual_dma = can_use_virtual_dma & 1;
	190	}
	191	}
	192
	193	#define fd_chose_dma_mode(addr, size) _fd_chose_dma_mode(addr, size)
	194
	195
	196	static int vdma_dma_setup(char *addr, unsigned long size, int mode, int io)
	197	{
	198	doing_pdma = 1;
	199	virtual_dma_port = io;
	200	virtual_dma_mode = (mode == DMA_MODE_WRITE);
	201	virtual_dma_addr = addr;
	202	virtual_dma_count = size;
	203	virtual_dma_residue = 0;
	204	return 0;
	205	}
	206
	207	static int hard_dma_setup(char *addr, unsigned long size, int mode, int io)
	208	{
	209	#ifdef FLOPPY_SANITY_CHECK
	210	if (CROSS_64KB(addr, size)) {
	211	printk("DMA crossing 64-K boundary %p-%p\n", addr, addr+size);
	212	return -1;
	213	}
	214	#endif
	215
	216	dma_cache_wback_inv(addr, size);
	217
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
75c96f85	228	static struct fd_routine_l {
1da177e4 LT	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
	252	static int FDC1 = 0x3f0;
	253	static int FDC2 = -1;
	254
	255	/*
	256	* Floppy types are stored in the rtc's CMOS RAM and so rtc_lock
	257	* is needed to prevent corrupted CMOS RAM in case "insmod floppy"
	258	* coincides with another rtc CMOS user. Paul G.
	259	*/
	260	#define FLOPPY0_TYPE (4)
	261	#define FLOPPY1_TYPE (0)
	262
	263	#define N_FDC 2
	264	#define N_DRIVE 8
	265
	266	#define FLOPPY_MOTOR_MASK 0xf0
	267
	268	#define AUTO_DMA
	269
	270	#define EXTRA_FLOPPY_PARAMS
	271
	272	#endif /* __ASM_SH_FLOPPY_H */