/*

 * 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_64_FLOPPY_H

#define __ASM_X86_64_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

#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

	{

		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, 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,

				   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 FLOPPY_MOTOR_MASK 0xf0

#define AUTO_DMA

#define EXTRA_FLOPPY_PARAMS

#endif /* __ASM_X86_64_FLOPPY_H */