[GitHub/mt8127/android_kernel_alcatel_ttab.git] / include / asm-sparc / floppy.h

/* asm-sparc/floppy.h: Sparc specific parts of the Floppy driver.
 *
 * Copyright (C) 1995 David S. Miller (davem@davemloft.net)
 */

#ifndef __ASM_SPARC_FLOPPY_H
#define __ASM_SPARC_FLOPPY_H

#include <asm/page.h>
#include <asm/pgtable.h>
#include <asm/system.h>
#include <asm/idprom.h>
#include <asm/machines.h>
#include <asm/oplib.h>
#include <asm/auxio.h>
#include <asm/irq.h>

/* We don't need no stinkin' I/O port allocation crap. */
#undef release_region
#undef request_region
#define release_region(X, Y)	do { } while(0)
#define request_region(X, Y, Z)	(1)

/* References:
 * 1) Netbsd Sun floppy driver.
 * 2) NCR 82077 controller manual
 * 3) Intel 82077 controller manual
 */
struct sun_flpy_controller {
	volatile unsigned char status_82072;  /* Main Status reg. */
#define dcr_82072              status_82072   /* Digital Control reg. */
#define status1_82077          status_82072   /* Auxiliary Status reg. 1 */

	volatile unsigned char data_82072;    /* Data fifo. */
#define status2_82077          data_82072     /* Auxiliary Status reg. 2 */

	volatile unsigned char dor_82077;     /* Digital Output reg. */
	volatile unsigned char tapectl_82077; /* What the? Tape control reg? */

	volatile unsigned char status_82077;  /* Main Status Register. */
#define drs_82077              status_82077   /* Digital Rate Select reg. */

	volatile unsigned char data_82077;    /* Data fifo. */
	volatile unsigned char ___unused;
	volatile unsigned char dir_82077;     /* Digital Input reg. */
#define dcr_82077              dir_82077      /* Config Control reg. */
};

/* You'll only ever find one controller on a SparcStation anyways. */
static struct sun_flpy_controller *sun_fdc = NULL;
extern volatile unsigned char *fdc_status;

struct sun_floppy_ops {
	unsigned char (*fd_inb)(int port);
	void (*fd_outb)(unsigned char value, int port);
};

static struct sun_floppy_ops sun_fdops;

#define fd_inb(port)              sun_fdops.fd_inb(port)
#define fd_outb(value,port)       sun_fdops.fd_outb(value,port)
#define fd_enable_dma()           sun_fd_enable_dma()
#define fd_disable_dma()          sun_fd_disable_dma()
#define fd_request_dma()          (0) /* nothing... */
#define fd_free_dma()             /* nothing... */
#define fd_clear_dma_ff()         /* nothing... */
#define fd_set_dma_mode(mode)     sun_fd_set_dma_mode(mode)
#define fd_set_dma_addr(addr)     sun_fd_set_dma_addr(addr)
#define fd_set_dma_count(count)   sun_fd_set_dma_count(count)
#define fd_enable_irq()           /* nothing... */
#define fd_disable_irq()          /* nothing... */
#define fd_cacheflush(addr, size) /* nothing... */
#define fd_request_irq()          sun_fd_request_irq()
#define fd_free_irq()             /* nothing... */
#if 0  /* P3: added by Alain, these cause a MMU corruption. 19960524 XXX */
#define fd_dma_mem_alloc(size)    ((unsigned long) vmalloc(size))
#define fd_dma_mem_free(addr,size) (vfree((void *)(addr)))
#endif

/* XXX This isn't really correct. XXX */
#define get_dma_residue(x)        (0)

#define FLOPPY0_TYPE  4
#define FLOPPY1_TYPE  0

/* Super paranoid... */
#undef HAVE_DISABLE_HLT

/* Here is where we catch the floppy driver trying to initialize,
 * therefore this is where we call the PROM device tree probing
 * routine etc. on the Sparc.
 */
#define FDC1                      sun_floppy_init()

#define N_FDC    1
#define N_DRIVE  8

/* No 64k boundary crossing problems on the Sparc. */
#define CROSS_64KB(a,s) (0)

/* Routines unique to each controller type on a Sun. */
static void sun_set_dor(unsigned char value, int fdc_82077)
{
	if (sparc_cpu_model == sun4c) {
		unsigned int bits = 0;
		if (value & 0x10)
			bits |= AUXIO_FLPY_DSEL;
		if ((value & 0x80) == 0)
			bits |= AUXIO_FLPY_EJCT;
		set_auxio(bits, (~bits) & (AUXIO_FLPY_DSEL|AUXIO_FLPY_EJCT));
	}
	if (fdc_82077) {
		sun_fdc->dor_82077 = value;
	}
}

static unsigned char sun_read_dir(void)
{
	if (sparc_cpu_model == sun4c)
		return (get_auxio() & AUXIO_FLPY_DCHG) ? 0x80 : 0;
	else
		return sun_fdc->dir_82077;
}

static unsigned char sun_82072_fd_inb(int port)
{
	udelay(5);
	switch(port & 7) {
	default:
		printk("floppy: Asked to read unknown port %d\n", port);
		panic("floppy: Port bolixed.");
	case 4: /* FD_STATUS */
		return sun_fdc->status_82072 & ~STATUS_DMA;
	case 5: /* FD_DATA */
		return sun_fdc->data_82072;
	case 7: /* FD_DIR */
		return sun_read_dir();
	};
	panic("sun_82072_fd_inb: How did I get here?");
}

static void sun_82072_fd_outb(unsigned char value, int port)
{
	udelay(5);
	switch(port & 7) {
	default:
		printk("floppy: Asked to write to unknown port %d\n", port);
		panic("floppy: Port bolixed.");
	case 2: /* FD_DOR */
		sun_set_dor(value, 0);
		break;
	case 5: /* FD_DATA */
		sun_fdc->data_82072 = value;
		break;
	case 7: /* FD_DCR */
		sun_fdc->dcr_82072 = value;
		break;
	case 4: /* FD_STATUS */
		sun_fdc->status_82072 = value;
		break;
	};
	return;
}

static unsigned char sun_82077_fd_inb(int port)
{
	udelay(5);
	switch(port & 7) {
	default:
		printk("floppy: Asked to read unknown port %d\n", port);
		panic("floppy: Port bolixed.");
	case 0: /* FD_STATUS_0 */
		return sun_fdc->status1_82077;
	case 1: /* FD_STATUS_1 */
		return sun_fdc->status2_82077;
	case 2: /* FD_DOR */
		return sun_fdc->dor_82077;
	case 3: /* FD_TDR */
		return sun_fdc->tapectl_82077;
	case 4: /* FD_STATUS */
		return sun_fdc->status_82077 & ~STATUS_DMA;
	case 5: /* FD_DATA */
		return sun_fdc->data_82077;
	case 7: /* FD_DIR */
		return sun_read_dir();
	};
	panic("sun_82077_fd_inb: How did I get here?");
}

static void sun_82077_fd_outb(unsigned char value, int port)
{
	udelay(5);
	switch(port & 7) {
	default:
		printk("floppy: Asked to write to unknown port %d\n", port);
		panic("floppy: Port bolixed.");
	case 2: /* FD_DOR */
		sun_set_dor(value, 1);
		break;
	case 5: /* FD_DATA */
		sun_fdc->data_82077 = value;
		break;
	case 7: /* FD_DCR */
		sun_fdc->dcr_82077 = value;
		break;
	case 4: /* FD_STATUS */
		sun_fdc->status_82077 = value;
		break;
	case 3: /* FD_TDR */
		sun_fdc->tapectl_82077 = value;
		break;
	};
	return;
}

/* For pseudo-dma (Sun floppy drives have no real DMA available to
 * them so we must eat the data fifo bytes directly ourselves) we have
 * three state variables.  doing_pdma tells our inline low-level
 * assembly floppy interrupt entry point whether it should sit and eat
 * bytes from the fifo or just transfer control up to the higher level
 * floppy interrupt c-code.  I tried very hard but I could not get the
 * pseudo-dma to work in c-code without getting many overruns and
 * underruns.  If non-zero, doing_pdma encodes the direction of
 * the transfer for debugging.  1=read 2=write
 */
extern char *pdma_vaddr;
extern unsigned long pdma_size;
extern volatile int doing_pdma;

/* This is software state */
extern char *pdma_base;
extern unsigned long pdma_areasize;

/* Common routines to all controller types on the Sparc. */
static inline void virtual_dma_init(void)
{
	/* nothing... */
}

static inline void sun_fd_disable_dma(void)
{
	doing_pdma = 0;
	if (pdma_base) {
		mmu_unlockarea(pdma_base, pdma_areasize);
		pdma_base = NULL;
	}
}

static inline void sun_fd_set_dma_mode(int mode)
{
	switch(mode) {
	case DMA_MODE_READ:
		doing_pdma = 1;
		break;
	case DMA_MODE_WRITE:
		doing_pdma = 2;
		break;
	default:
		printk("Unknown dma mode %d\n", mode);
		panic("floppy: Giving up...");
	}
}

static inline void sun_fd_set_dma_addr(char *buffer)
{
	pdma_vaddr = buffer;
}

static inline void sun_fd_set_dma_count(int length)
{
	pdma_size = length;
}

static inline void sun_fd_enable_dma(void)
{
	pdma_vaddr = mmu_lockarea(pdma_vaddr, pdma_size);
	pdma_base = pdma_vaddr;
	pdma_areasize = pdma_size;
}

/* Our low-level entry point in arch/sparc/kernel/entry.S */
extern int sparc_floppy_request_irq(int irq, unsigned long flags,
				    irq_handler_t irq_handler);

static int sun_fd_request_irq(void)
{
	static int once = 0;
	int error;

	if(!once) {
		once = 1;
		error = sparc_floppy_request_irq(FLOPPY_IRQ,
						 IRQF_DISABLED,
						 floppy_interrupt);
		return ((error == 0) ? 0 : -1);
	} else return 0;
}

static struct linux_prom_registers fd_regs[2];

static int sun_floppy_init(void)
{
	char state[128];
	int tnode, fd_node, num_regs;
	struct resource r;

	use_virtual_dma = 1;
	
	FLOPPY_IRQ = 11;
	/* Forget it if we aren't on a machine that could possibly
	 * ever have a floppy drive.
	 */
	if((sparc_cpu_model != sun4c && sparc_cpu_model != sun4m) ||
	   ((idprom->id_machtype == (SM_SUN4C | SM_4C_SLC)) ||
	    (idprom->id_machtype == (SM_SUN4C | SM_4C_ELC)))) {
		/* We certainly don't have a floppy controller. */
		goto no_sun_fdc;
	}
	/* Well, try to find one. */
	tnode = prom_getchild(prom_root_node);
	fd_node = prom_searchsiblings(tnode, "obio");
	if(fd_node != 0) {
		tnode = prom_getchild(fd_node);
		fd_node = prom_searchsiblings(tnode, "SUNW,fdtwo");
	} else {
		fd_node = prom_searchsiblings(tnode, "fd");
	}
	if(fd_node == 0) {
		goto no_sun_fdc;
	}

	/* The sun4m lets us know if the controller is actually usable. */
	if(sparc_cpu_model == sun4m &&
	   prom_getproperty(fd_node, "status", state, sizeof(state)) != -1) {
		if(!strcmp(state, "disabled")) {
			goto no_sun_fdc;
		}
	}
	num_regs = prom_getproperty(fd_node, "reg", (char *) fd_regs, sizeof(fd_regs));
	num_regs = (num_regs / sizeof(fd_regs[0]));
	prom_apply_obio_ranges(fd_regs, num_regs);
	memset(&r, 0, sizeof(r));
	r.flags = fd_regs[0].which_io;
	r.start = fd_regs[0].phys_addr;
	sun_fdc = (struct sun_flpy_controller *)
	    sbus_ioremap(&r, 0, fd_regs[0].reg_size, "floppy");

	/* Last minute sanity check... */
	if(sun_fdc->status_82072 == 0xff) {
		sun_fdc = NULL;
		goto no_sun_fdc;
	}

	sun_fdops.fd_inb = sun_82077_fd_inb;
	sun_fdops.fd_outb = sun_82077_fd_outb;
	fdc_status = &sun_fdc->status_82077;

	if (sun_fdc->dor_82077 == 0x80) {
		sun_fdc->dor_82077 = 0x02;
		if (sun_fdc->dor_82077 == 0x80) {
			sun_fdops.fd_inb = sun_82072_fd_inb;
			sun_fdops.fd_outb = sun_82072_fd_outb;
			fdc_status = &sun_fdc->status_82072;
		}
	}

	/* Success... */
	allowed_drive_mask = 0x01;
	return (int) sun_fdc;

no_sun_fdc:
	return -1;
}

static int sparc_eject(void)
{
	set_dor(0x00, 0xff, 0x90);
	udelay(500);
	set_dor(0x00, 0x6f, 0x00);
	udelay(500);
	return 0;
}

#define fd_eject(drive) sparc_eject()

#define EXTRA_FLOPPY_PARAMS

#endif /* !(__ASM_SPARC_FLOPPY_H) */
Commit	Line	Data
1da177e4 LT	1	/* asm-sparc/floppy.h: Sparc specific parts of the Floppy driver.
1da177e4 LT	2	*
64d329ee	3	* Copyright (C) 1995 David S. Miller (davem@davemloft.net)
1da177e4 LT	4	*/
	5
	6	#ifndef __ASM_SPARC_FLOPPY_H
	7	#define __ASM_SPARC_FLOPPY_H
	8
	9	#include <asm/page.h>
	10	#include <asm/pgtable.h>
	11	#include <asm/system.h>
	12	#include <asm/idprom.h>
	13	#include <asm/machines.h>
	14	#include <asm/oplib.h>
	15	#include <asm/auxio.h>
	16	#include <asm/irq.h>
	17
	18	/* We don't need no stinkin' I/O port allocation crap. */
	19	#undef release_region
1da177e4 LT	20	#undef request_region
1da177e4 LT	21	#define release_region(X, Y) do { } while(0)
1da177e4 LT	22	#define request_region(X, Y, Z) (1)
	23
	24	/* References:
	25	* 1) Netbsd Sun floppy driver.
	26	* 2) NCR 82077 controller manual
	27	* 3) Intel 82077 controller manual
	28	*/
	29	struct sun_flpy_controller {
	30	volatile unsigned char status_82072; /* Main Status reg. */
	31	#define dcr_82072 status_82072 /* Digital Control reg. */
	32	#define status1_82077 status_82072 /* Auxiliary Status reg. 1 */
	33
	34	volatile unsigned char data_82072; /* Data fifo. */
	35	#define status2_82077 data_82072 /* Auxiliary Status reg. 2 */
	36
	37	volatile unsigned char dor_82077; /* Digital Output reg. */
	38	volatile unsigned char tapectl_82077; /* What the? Tape control reg? */
	39
	40	volatile unsigned char status_82077; /* Main Status Register. */
	41	#define drs_82077 status_82077 /* Digital Rate Select reg. */
	42
	43	volatile unsigned char data_82077; /* Data fifo. */
	44	volatile unsigned char ___unused;
	45	volatile unsigned char dir_82077; /* Digital Input reg. */
	46	#define dcr_82077 dir_82077 /* Config Control reg. */
	47	};
	48
	49	/* You'll only ever find one controller on a SparcStation anyways. */
	50	static struct sun_flpy_controller *sun_fdc = NULL;
0a808a31	51	extern volatile unsigned char *fdc_status;
1da177e4 LT	52
	53	struct sun_floppy_ops {
	54	unsigned char (*fd_inb)(int port);
	55	void (*fd_outb)(unsigned char value, int port);
	56	};
	57
	58	static struct sun_floppy_ops sun_fdops;
	59
	60	#define fd_inb(port) sun_fdops.fd_inb(port)
	61	#define fd_outb(value,port) sun_fdops.fd_outb(value,port)
	62	#define fd_enable_dma() sun_fd_enable_dma()
	63	#define fd_disable_dma() sun_fd_disable_dma()
	64	#define fd_request_dma() (0) /* nothing... */
	65	#define fd_free_dma() /* nothing... */
	66	#define fd_clear_dma_ff() /* nothing... */
	67	#define fd_set_dma_mode(mode) sun_fd_set_dma_mode(mode)
	68	#define fd_set_dma_addr(addr) sun_fd_set_dma_addr(addr)
	69	#define fd_set_dma_count(count) sun_fd_set_dma_count(count)
	70	#define fd_enable_irq() /* nothing... */
	71	#define fd_disable_irq() /* nothing... */
	72	#define fd_cacheflush(addr, size) /* nothing... */
	73	#define fd_request_irq() sun_fd_request_irq()
	74	#define fd_free_irq() /* nothing... */
	75	#if 0 /* P3: added by Alain, these cause a MMU corruption. 19960524 XXX */
	76	#define fd_dma_mem_alloc(size) ((unsigned long) vmalloc(size))
	77	#define fd_dma_mem_free(addr,size) (vfree((void *)(addr)))
	78	#endif
	79
1da177e4 LT	80	/* XXX This isn't really correct. XXX */
	81	#define get_dma_residue(x) (0)
	82
	83	#define FLOPPY0_TYPE 4
	84	#define FLOPPY1_TYPE 0
	85
	86	/* Super paranoid... */
	87	#undef HAVE_DISABLE_HLT
	88
	89	/* Here is where we catch the floppy driver trying to initialize,
	90	* therefore this is where we call the PROM device tree probing
	91	* routine etc. on the Sparc.
	92	*/
	93	#define FDC1 sun_floppy_init()
	94
	95	#define N_FDC 1
	96	#define N_DRIVE 8
	97
	98	/* No 64k boundary crossing problems on the Sparc. */
	99	#define CROSS_64KB(a,s) (0)
	100
	101	/* Routines unique to each controller type on a Sun. */
b65f0755 MF	102	static void sun_set_dor(unsigned char value, int fdc_82077)
	103	{
	104	if (sparc_cpu_model == sun4c) {
	105	unsigned int bits = 0;
	106	if (value & 0x10)
	107	bits \|= AUXIO_FLPY_DSEL;
	108	if ((value & 0x80) == 0)
	109	bits \|= AUXIO_FLPY_EJCT;
	110	set_auxio(bits, (~bits) & (AUXIO_FLPY_DSEL\|AUXIO_FLPY_EJCT));
	111	}
	112	if (fdc_82077) {
	113	sun_fdc->dor_82077 = value;
	114	}
	115	}
	116
	117	static unsigned char sun_read_dir(void)
	118	{
	119	if (sparc_cpu_model == sun4c)
	120	return (get_auxio() & AUXIO_FLPY_DCHG) ? 0x80 : 0;
	121	else
	122	return sun_fdc->dir_82077;
	123	}
	124
1da177e4 LT	125	static unsigned char sun_82072_fd_inb(int port)
	126	{
	127	udelay(5);
	128	switch(port & 7) {
	129	default:
	130	printk("floppy: Asked to read unknown port %d\n", port);
	131	panic("floppy: Port bolixed.");
	132	case 4: /* FD_STATUS */
	133	return sun_fdc->status_82072 & ~STATUS_DMA;
	134	case 5: /* FD_DATA */
	135	return sun_fdc->data_82072;
	136	case 7: /* FD_DIR */
b65f0755	137	return sun_read_dir();
1da177e4 LT	138	};
	139	panic("sun_82072_fd_inb: How did I get here?");
	140	}
	141
	142	static void sun_82072_fd_outb(unsigned char value, int port)
	143	{
	144	udelay(5);
	145	switch(port & 7) {
	146	default:
	147	printk("floppy: Asked to write to unknown port %d\n", port);
	148	panic("floppy: Port bolixed.");
	149	case 2: /* FD_DOR */
b65f0755	150	sun_set_dor(value, 0);
1da177e4 LT	151	break;
	152	case 5: /* FD_DATA */
	153	sun_fdc->data_82072 = value;
	154	break;
	155	case 7: /* FD_DCR */
	156	sun_fdc->dcr_82072 = value;
	157	break;
	158	case 4: /* FD_STATUS */
	159	sun_fdc->status_82072 = value;
	160	break;
	161	};
	162	return;
	163	}
	164
	165	static unsigned char sun_82077_fd_inb(int port)
	166	{
	167	udelay(5);
	168	switch(port & 7) {
	169	default:
	170	printk("floppy: Asked to read unknown port %d\n", port);
	171	panic("floppy: Port bolixed.");
b65f0755 MF	172	case 0: /* FD_STATUS_0 */
	173	return sun_fdc->status1_82077;
	174	case 1: /* FD_STATUS_1 */
	175	return sun_fdc->status2_82077;
	176	case 2: /* FD_DOR */
	177	return sun_fdc->dor_82077;
	178	case 3: /* FD_TDR */
	179	return sun_fdc->tapectl_82077;
1da177e4 LT	180	case 4: /* FD_STATUS */
	181	return sun_fdc->status_82077 & ~STATUS_DMA;
	182	case 5: /* FD_DATA */
	183	return sun_fdc->data_82077;
	184	case 7: /* FD_DIR */
b65f0755	185	return sun_read_dir();
1da177e4	186	};
b65f0755	187	panic("sun_82077_fd_inb: How did I get here?");
1da177e4 LT	188	}
	189
	190	static void sun_82077_fd_outb(unsigned char value, int port)
	191	{
	192	udelay(5);
	193	switch(port & 7) {
	194	default:
	195	printk("floppy: Asked to write to unknown port %d\n", port);
	196	panic("floppy: Port bolixed.");
	197	case 2: /* FD_DOR */
b65f0755	198	sun_set_dor(value, 1);
1da177e4 LT	199	break;
	200	case 5: /* FD_DATA */
	201	sun_fdc->data_82077 = value;
	202	break;
	203	case 7: /* FD_DCR */
	204	sun_fdc->dcr_82077 = value;
	205	break;
	206	case 4: /* FD_STATUS */
	207	sun_fdc->status_82077 = value;
	208	break;
b65f0755 MF	209	case 3: /* FD_TDR */
	210	sun_fdc->tapectl_82077 = value;
	211	break;
1da177e4 LT	212	};
	213	return;
	214	}
	215
	216	/* For pseudo-dma (Sun floppy drives have no real DMA available to
	217	* them so we must eat the data fifo bytes directly ourselves) we have
	218	* three state variables. doing_pdma tells our inline low-level
	219	* assembly floppy interrupt entry point whether it should sit and eat
	220	* bytes from the fifo or just transfer control up to the higher level
	221	* floppy interrupt c-code. I tried very hard but I could not get the
	222	* pseudo-dma to work in c-code without getting many overruns and
	223	* underruns. If non-zero, doing_pdma encodes the direction of
	224	* the transfer for debugging. 1=read 2=write
	225	*/
0a808a31 DM	226	extern char *pdma_vaddr;
	227	extern unsigned long pdma_size;
	228	extern volatile int doing_pdma;
1da177e4 LT	229
1da177e4 LT	230	/* This is software state */
0a808a31 DM	231	extern char *pdma_base;
0a808a31 DM	232	extern unsigned long pdma_areasize;
1da177e4 LT	233
1da177e4 LT	234	/* Common routines to all controller types on the Sparc. */
64d329ee	235	static inline void virtual_dma_init(void)
1da177e4 LT	236	{
	237	/* nothing... */
	238	}
	239
64d329ee	240	static inline void sun_fd_disable_dma(void)
1da177e4 LT	241	{
	242	doing_pdma = 0;
	243	if (pdma_base) {
	244	mmu_unlockarea(pdma_base, pdma_areasize);
3c51f196	245	pdma_base = NULL;
1da177e4 LT	246	}
	247	}
	248
64d329ee	249	static inline void sun_fd_set_dma_mode(int mode)
1da177e4 LT	250	{
	251	switch(mode) {
	252	case DMA_MODE_READ:
	253	doing_pdma = 1;
	254	break;
	255	case DMA_MODE_WRITE:
	256	doing_pdma = 2;
	257	break;
	258	default:
	259	printk("Unknown dma mode %d\n", mode);
	260	panic("floppy: Giving up...");
	261	}
	262	}
	263
64d329ee	264	static inline void sun_fd_set_dma_addr(char *buffer)
1da177e4 LT	265	{
	266	pdma_vaddr = buffer;
	267	}
	268
64d329ee	269	static inline void sun_fd_set_dma_count(int length)
1da177e4 LT	270	{
	271	pdma_size = length;
	272	}
	273
64d329ee	274	static inline void sun_fd_enable_dma(void)
1da177e4 LT	275	{
	276	pdma_vaddr = mmu_lockarea(pdma_vaddr, pdma_size);
	277	pdma_base = pdma_vaddr;
	278	pdma_areasize = pdma_size;
	279	}
	280
	281	/* Our low-level entry point in arch/sparc/kernel/entry.S */
0a808a31	282	extern int sparc_floppy_request_irq(int irq, unsigned long flags,
5dc0742b	283	irq_handler_t irq_handler);
1da177e4 LT	284
	285	static int sun_fd_request_irq(void)
	286	{
	287	static int once = 0;
	288	int error;
	289
	290	if(!once) {
	291	once = 1;
0a808a31 DM	292	error = sparc_floppy_request_irq(FLOPPY_IRQ,
	293	IRQF_DISABLED,
	294	floppy_interrupt);
1da177e4 LT	295	return ((error == 0) ? 0 : -1);
	296	} else return 0;
	297	}
	298
	299	static struct linux_prom_registers fd_regs[2];
	300
	301	static int sun_floppy_init(void)
	302	{
	303	char state[128];
	304	int tnode, fd_node, num_regs;
	305	struct resource r;
	306
	307	use_virtual_dma = 1;
	308
	309	FLOPPY_IRQ = 11;
	310	/* Forget it if we aren't on a machine that could possibly
	311	* ever have a floppy drive.
	312	*/
	313	if((sparc_cpu_model != sun4c && sparc_cpu_model != sun4m) \|\|
	314	((idprom->id_machtype == (SM_SUN4C \| SM_4C_SLC)) \|\|
	315	(idprom->id_machtype == (SM_SUN4C \| SM_4C_ELC)))) {
	316	/* We certainly don't have a floppy controller. */
	317	goto no_sun_fdc;
	318	}
	319	/* Well, try to find one. */
	320	tnode = prom_getchild(prom_root_node);
	321	fd_node = prom_searchsiblings(tnode, "obio");
	322	if(fd_node != 0) {
	323	tnode = prom_getchild(fd_node);
	324	fd_node = prom_searchsiblings(tnode, "SUNW,fdtwo");
	325	} else {
	326	fd_node = prom_searchsiblings(tnode, "fd");
	327	}
	328	if(fd_node == 0) {
	329	goto no_sun_fdc;
	330	}
	331
	332	/* The sun4m lets us know if the controller is actually usable. */
	333	if(sparc_cpu_model == sun4m &&
	334	prom_getproperty(fd_node, "status", state, sizeof(state)) != -1) {
	335	if(!strcmp(state, "disabled")) {
	336	goto no_sun_fdc;
	337	}
	338	}
	339	num_regs = prom_getproperty(fd_node, "reg", (char *) fd_regs, sizeof(fd_regs));
	340	num_regs = (num_regs / sizeof(fd_regs[0]));
	341	prom_apply_obio_ranges(fd_regs, num_regs);
	342	memset(&r, 0, sizeof(r));
	343	r.flags = fd_regs[0].which_io;
	344	r.start = fd_regs[0].phys_addr;
	345	sun_fdc = (struct sun_flpy_controller *)
	346	sbus_ioremap(&r, 0, fd_regs[0].reg_size, "floppy");
	347
	348	/* Last minute sanity check... */
	349	if(sun_fdc->status_82072 == 0xff) {
	350	sun_fdc = NULL;
	351	goto no_sun_fdc;
	352	}
	353
b65f0755 MF	354	sun_fdops.fd_inb = sun_82077_fd_inb;
	355	sun_fdops.fd_outb = sun_82077_fd_outb;
	356	fdc_status = &sun_fdc->status_82077;
	357
	358	if (sun_fdc->dor_82077 == 0x80) {
	359	sun_fdc->dor_82077 = 0x02;
	360	if (sun_fdc->dor_82077 == 0x80) {
	361	sun_fdops.fd_inb = sun_82072_fd_inb;
	362	sun_fdops.fd_outb = sun_82072_fd_outb;
	363	fdc_status = &sun_fdc->status_82072;
	364	}
1da177e4 LT	365	}
	366
	367	/* Success... */
	368	allowed_drive_mask = 0x01;
	369	return (int) sun_fdc;
	370
	371	no_sun_fdc:
	372	return -1;
	373	}
	374
	375	static int sparc_eject(void)
	376	{
	377	set_dor(0x00, 0xff, 0x90);
	378	udelay(500);
	379	set_dor(0x00, 0x6f, 0x00);
	380	udelay(500);
	381	return 0;
	382	}
	383
	384	#define fd_eject(drive) sparc_eject()
	385
	386	#define EXTRA_FLOPPY_PARAMS
	387
	388	#endif /* !(__ASM_SPARC_FLOPPY_H) */