[mirror_ubuntu-zesty-kernel.git] / arch / parisc / include / asm / floppy.h

/*    Architecture specific parts of the Floppy driver
 *
 *    Linux/PA-RISC Project (http://www.parisc-linux.org/)
 *    Copyright (C) 2000 Matthew Wilcox (willy a debian . org)
 *    Copyright (C) 2000 Dave Kennedy
 *
 *    This program is free software; you can redistribute it and/or modify
 *    it under the terms of the GNU General Public License as published by
 *    the Free Software Foundation; either version 2 of the License, or
 *    (at your option) any later version.
 *
 *    This program is distributed in the hope that it will be useful,
 *    but WITHOUT ANY WARRANTY; without even the implied warranty of
 *    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 *    GNU General Public License for more details.
 *
 *    You should have received a copy of the GNU General Public License
 *    along with this program; if not, write to the Free Software
 *    Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
 */
#ifndef __ASM_PARISC_FLOPPY_H
#define __ASM_PARISC_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)			readb(port)
#define fd_outb(value, port)		writeb(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=0;
static int virtual_dma_residue=0;
static char *virtual_dma_addr=0;
static int virtual_dma_mode=0;
static int doing_pdma=0;

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 = virtual_dma_addr;

		for (lcount = virtual_dma_count; lcount; lcount--) {
			st = fd_inb(virtual_dma_port+4) & 0xa0 ;
			if (st != 0xa0) 
				break;
			if (virtual_dma_mode) {
				fd_outb(*lptr, virtual_dma_port+5);
			} else {
				*lptr = fd_inb(virtual_dma_port+5);
			}
			lptr++;
		}
		virtual_dma_count = lcount;
		virtual_dma_addr = lptr;
		st = fd_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,
				   0, "floppy", NULL);
	else
		return request_irq(FLOPPY_IRQ, floppy_interrupt,
				   0, "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) >= 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,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; /* Lies.  Floppy controller is memory mapped, not io mapped */
static int FDC2 = -1;

#define FLOPPY0_TYPE	0
#define FLOPPY1_TYPE	0

#define N_FDC 1
#define N_DRIVE 8

#define EXTRA_FLOPPY_PARAMS

#endif /* __ASM_PARISC_FLOPPY_H */
Commit	Line	Data
1da177e4 LT	1	/* Architecture specific parts of the Floppy driver
	2	*
	3	* Linux/PA-RISC Project (http://www.parisc-linux.org/)
	4	* Copyright (C) 2000 Matthew Wilcox (willy a debian . org)
	5	* Copyright (C) 2000 Dave Kennedy
	6	*
	7	* This program is free software; you can redistribute it and/or modify
	8	* it under the terms of the GNU General Public License as published by
	9	* the Free Software Foundation; either version 2 of the License, or
	10	* (at your option) any later version.
	11	*
	12	* This program is distributed in the hope that it will be useful,
	13	* but WITHOUT ANY WARRANTY; without even the implied warranty of
	14	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
	15	* GNU General Public License for more details.
	16	*
	17	* You should have received a copy of the GNU General Public License
	18	* along with this program; if not, write to the Free Software
	19	* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
	20	*/
	21	#ifndef __ASM_PARISC_FLOPPY_H
	22	#define __ASM_PARISC_FLOPPY_H
	23
	24	#include <linux/vmalloc.h>
	25
	26
	27	/*
	28	* The DMA channel used by the floppy controller cannot access data at
	29	* addresses >= 16MB
	30	*
	31	* Went back to the 1MB limit, as some people had problems with the floppy
	32	* driver otherwise. It doesn't matter much for performance anyway, as most
	33	* floppy accesses go through the track buffer.
	34	*/
	35	#define _CROSS_64KB(a,s,vdma) \
9a334d39	36	(!(vdma) && ((unsigned long)(a)/K_64 != ((unsigned long)(a) + (s) - 1) / K_64))
1da177e4 LT	37
	38	#define CROSS_64KB(a,s) _CROSS_64KB(a,s,use_virtual_dma & 1)
	39
	40
	41	#define SW fd_routine[use_virtual_dma&1]
	42	#define CSW fd_routine[can_use_virtual_dma & 1]
	43
	44
	45	#define fd_inb(port) readb(port)
	46	#define fd_outb(value, port) writeb(value, port)
	47
	48	#define fd_request_dma() CSW._request_dma(FLOPPY_DMA,"floppy")
	49	#define fd_free_dma() CSW._free_dma(FLOPPY_DMA)
	50	#define fd_enable_irq() enable_irq(FLOPPY_IRQ)
	51	#define fd_disable_irq() disable_irq(FLOPPY_IRQ)
	52	#define fd_free_irq() free_irq(FLOPPY_IRQ, NULL)
	53	#define fd_get_dma_residue() SW._get_dma_residue(FLOPPY_DMA)
	54	#define fd_dma_mem_alloc(size) SW._dma_mem_alloc(size)
	55	#define fd_dma_setup(addr, size, mode, io) SW._dma_setup(addr, size, mode, io)
	56
	57	#define FLOPPY_CAN_FALLBACK_ON_NODMA
	58
	59	static int virtual_dma_count=0;
	60	static int virtual_dma_residue=0;
	61	static char *virtual_dma_addr=0;
	62	static int virtual_dma_mode=0;
	63	static int doing_pdma=0;
	64
	65	static void floppy_hardint(int irq, void dev_id, struct pt_regs regs)
	66	{
	67	register unsigned char st;
	68
	69	#undef TRACE_FLPY_INT
	70
	71	#ifdef TRACE_FLPY_INT
	72	static int calls=0;
	73	static int bytes=0;
	74	static int dma_wait=0;
	75	#endif
	76	if (!doing_pdma) {
	77	floppy_interrupt(irq, dev_id, regs);
	78	return;
	79	}
	80
	81	#ifdef TRACE_FLPY_INT
	82	if(!calls)
	83	bytes = virtual_dma_count;
	84	#endif
	85
	86	{
	87	register int lcount;
	88	register char *lptr = virtual_dma_addr;
	89
	90	for (lcount = virtual_dma_count; lcount; lcount--) {
	91	st = fd_inb(virtual_dma_port+4) & 0xa0 ;
	92	if (st != 0xa0)
	93	break;
	94	if (virtual_dma_mode) {
	95	fd_outb(*lptr, virtual_dma_port+5);
	96	} else {
	97	*lptr = fd_inb(virtual_dma_port+5);
	98	}
	99	lptr++;
	100	}
101	virtual_dma_count = lcount;
102	virtual_dma_addr = lptr;
103	st = fd_inb(virtual_dma_port+4);
104	}
105
106	#ifdef TRACE_FLPY_INT
107	calls++;
108	#endif
109	if (st == 0x20)
110	return;
111	if (!(st & 0x20)) {
112	virtual_dma_residue += virtual_dma_count;
113	virtual_dma_count = 0;
114	#ifdef TRACE_FLPY_INT
115	printk("count=%x, residue=%x calls=%d bytes=%d dma_wait=%d\n",
116	virtual_dma_count, virtual_dma_residue, calls, bytes,
117	dma_wait);
118	calls = 0;
119	dma_wait=0;
120	#endif
121	doing_pdma = 0;
122	floppy_interrupt(irq, dev_id, regs);
123	return;
124	}
125	#ifdef TRACE_FLPY_INT
126	if (!virtual_dma_count)
127	dma_wait++;
128	#endif
129	}
130
131	static void fd_disable_dma(void)
132	{
133	if(! (can_use_virtual_dma & 1))
134	disable_dma(FLOPPY_DMA);
135	doing_pdma = 0;
136	virtual_dma_residue += virtual_dma_count;
137	virtual_dma_count=0;
138	}
139
140	static int vdma_request_dma(unsigned int dmanr, const char * device_id)
141	{
142	return 0;
143	}
144
145	static void vdma_nop(unsigned int dummy)
146	{
147	}
148
149
150	static int vdma_get_dma_residue(unsigned int dummy)
151	{
152	return virtual_dma_count + virtual_dma_residue;
153	}
154
155
156	static int fd_request_irq(void)
157	{
158	if(can_use_virtual_dma)
733ea869	159	return request_irq(FLOPPY_IRQ, floppy_hardint,
b54cb233	160	0, "floppy", NULL);
1da177e4	161	else
733ea869	162	return request_irq(FLOPPY_IRQ, floppy_interrupt,
b54cb233	163	0, "floppy", NULL);
1da177e4 LT	164	}
	165
	166	static unsigned long dma_mem_alloc(unsigned long size)
	167	{
	168	return __get_dma_pages(GFP_KERNEL, get_order(size));
	169	}
	170
	171
	172	static unsigned long vdma_mem_alloc(unsigned long size)
	173	{
	174	return (unsigned long) vmalloc(size);
	175
	176	}
	177
	178	#define nodma_mem_alloc(size) vdma_mem_alloc(size)
	179
	180	static void _fd_dma_mem_free(unsigned long addr, unsigned long size)
	181	{
	182	if((unsigned int) addr >= (unsigned int) high_memory)
	183	return vfree((void *)addr);
	184	else
	185	free_pages(addr, get_order(size));
	186	}
	187
	188	#define fd_dma_mem_free(addr, size) _fd_dma_mem_free(addr, size)
	189
	190	static void _fd_chose_dma_mode(char *addr, unsigned long size)
	191	{
	192	if(can_use_virtual_dma == 2) {
	193	if((unsigned int) addr >= (unsigned int) high_memory \|\|
	194	virt_to_bus(addr) >= 0x1000000 \|\|
	195	_CROSS_64KB(addr, size, 0))
	196	use_virtual_dma = 1;
	197	else
	198	use_virtual_dma = 0;
	199	} else {
	200	use_virtual_dma = can_use_virtual_dma & 1;
	201	}
	202	}
	203
	204	#define fd_chose_dma_mode(addr, size) _fd_chose_dma_mode(addr, size)
	205
	206
	207	static int vdma_dma_setup(char *addr, unsigned long size, int mode, int io)
	208	{
	209	doing_pdma = 1;
	210	virtual_dma_port = io;
	211	virtual_dma_mode = (mode == DMA_MODE_WRITE);
	212	virtual_dma_addr = addr;
	213	virtual_dma_count = size;
	214	virtual_dma_residue = 0;
	215	return 0;
	216	}
	217
	218	static int hard_dma_setup(char *addr, unsigned long size, int mode, int io)
	219	{
	220	#ifdef FLOPPY_SANITY_CHECK
	221	if (CROSS_64KB(addr, size)) {
	222	printk("DMA crossing 64-K boundary %p-%p\n", addr, addr+size);
	223	return -1;
	224	}
	225	#endif
	226	/* actual, physical DMA */
	227	doing_pdma = 0;
228	clear_dma_ff(FLOPPY_DMA);
229	set_dma_mode(FLOPPY_DMA,mode);
230	set_dma_addr(FLOPPY_DMA,virt_to_bus(addr));
231	set_dma_count(FLOPPY_DMA,size);
232	enable_dma(FLOPPY_DMA);
233	return 0;
234	}
235
75c96f85	236	static struct fd_routine_l {
1da177e4 LT	237	int (_request_dma)(unsigned int dmanr, const char device_id);
	238	void (*_free_dma)(unsigned int dmanr);
	239	int (*_get_dma_residue)(unsigned int dummy);
	240	unsigned long (*_dma_mem_alloc) (unsigned long size);
	241	int (_dma_setup)(char addr, unsigned long size, int mode, int io);
	242	} fd_routine[] = {
	243	{
	244	request_dma,
	245	free_dma,
	246	get_dma_residue,
	247	dma_mem_alloc,
	248	hard_dma_setup
	249	},
	250	{
	251	vdma_request_dma,
	252	vdma_nop,
	253	vdma_get_dma_residue,
	254	vdma_mem_alloc,
	255	vdma_dma_setup
	256	}
	257	};
	258
	259
	260	static int FDC1 = 0x3f0; /* Lies. Floppy controller is memory mapped, not io mapped */
	261	static int FDC2 = -1;
	262
	263	#define FLOPPY0_TYPE 0
	264	#define FLOPPY1_TYPE 0
	265
	266	#define N_FDC 1
	267	#define N_DRIVE 8
	268
1da177e4 LT	269	#define EXTRA_FLOPPY_PARAMS
	270
	271	#endif /* __ASM_PARISC_FLOPPY_H */