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[/] [or1k/] [trunk/] [rc203soc/] [sw/] [uClinux/] [include/] [asm-sparc/] [floppy.h] - Blame information for rev 1765

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/* asm-sparc/floppy.h: Sparc specific parts of the Floppy driver.
 *
 * Copyright (C) 1995 David S. Miller (davem@caip.rutgers.edu)
 */
 
#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>
 
/* 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;
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
 
#define FLOPPY_MOTOR_MASK         0x10
 
/* It's all the same... */
#define virt_to_bus(x)            (x)
#define bus_to_virt(x)            (x)
 
/* 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()
 
static int FDC2=-1;
 
#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 unsigned char sun_82072_fd_inb(int port)
{
        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 (*AUXREG & AUXIO_FLPY_DCHG)? 0x80: 0;
        };
        panic("sun_82072_fd_inb: How did I get here?");
}
 
static void sun_82072_fd_outb(unsigned char value, int port)
{
        switch(port & 7) {
        default:
                printk("floppy: Asked to write to unknown port %d\n", port);
                panic("floppy: Port bolixed.");
        case 2: /* FD_DOR */
                /* Oh geese, 82072 on the Sun has no DOR register,
                 * the functionality is implemented via the AUXIO
                 * I/O register.  So we must emulate the behavior.
                 *
                 * ASSUMPTIONS:  There will only ever be one floppy
                 *               drive attached to a Sun controller
                 *               and it will be at drive zero.
                 */
                {
                        unsigned 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));
                }
                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)
{
        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_82077 & ~STATUS_DMA;
        case 5: /* FD_DATA */
                return sun_fdc->data_82077;
        case 7: /* FD_DIR */
                /* XXX: Is DCL on 0x80 in sun4m? */
                return sun_fdc->dir_82077;
        };
        panic("sun_82072_fd_inb: How did I get here?");
}
 
static void sun_82077_fd_outb(unsigned char value, int port)
{
        switch(port & 7) {
        default:
                printk("floppy: Asked to write to unknown port %d\n", port);
                panic("floppy: Port bolixed.");
        case 2: /* FD_DOR */
                /* Happily, the 82077 has a real DOR register. */
                sun_fdc->dor_82077 = value;
                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;
        };
        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
 */
char *pdma_vaddr;
unsigned long pdma_size;
volatile int doing_pdma = 0;
 
/* This is software state */
char *pdma_base = 0;
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 = 0;
        }
}
 
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 void floppy_hardint(int irq, void *unused, struct pt_regs *regs);
 
static int sun_fd_request_irq(void)
{
        static int once = 0;
        int error;
 
        if(!once) {
                once = 1;
                error = request_fast_irq(FLOPPY_IRQ, floppy_hardint, SA_INTERRUPT, "floppy");
                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;
 
        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));
                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);
        sun_fdc = (struct sun_flpy_controller *) sparc_alloc_io(fd_regs[0].phys_addr,
                                                                0x0,
                                                                fd_regs[0].reg_size,
                                                                "floppy",
                                                                fd_regs[0].which_io,
                                                                0x0);
        /* Last minute sanity check... */
        if(sun_fdc->status_82072 == 0xff) {
                sun_fdc = NULL;
                goto no_sun_fdc;
        }
 
        if(sparc_cpu_model == sun4c) {
                sun_fdops.fd_inb = sun_82072_fd_inb;
                sun_fdops.fd_outb = sun_82072_fd_outb;
                fdc_status = &sun_fdc->status_82072;
                /* printk("AUXIO @0x%p\n", auxio_register); */ /* P3 */
        } else {
                sun_fdops.fd_inb = sun_82077_fd_inb;
                sun_fdops.fd_outb = sun_82077_fd_outb;
                fdc_status = &sun_fdc->status_82077;
                /* printk("DOR @0x%p\n", &sun_fdc->dor_82077); */ /* P3 */
        }
 
        /* Success... */
        return (int) sun_fdc;
 
no_sun_fdc:
        return -1;
}
 
static int sparc_eject(void)
{
        set_dor(0, ~0, 0x90);
        udelay(500);
        set_dor(0, ~0x90, 0);
        udelay(500);
        return 0;
}
 
#define fd_eject(drive) sparc_eject()
 
#endif /* !(__ASM_SPARC_FLOPPY_H) */

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[/] [or1k/] [trunk/] [rc203soc/] [sw/] [uClinux/] [include/] [asm-sparc/] [floppy.h] - Blame information for rev 1765

Line No.	Rev	Author	Line
1	1633	jcastillo	`/* asm-sparc/floppy.h: Sparc specific parts of the Floppy driver.`
2			`*`
3			`* Copyright (C) 1995 David S. Miller (davem@caip.rutgers.edu)`
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			`/* References:`
19			`* 1) Netbsd Sun floppy driver.`
20			`* 2) NCR 82077 controller manual`
21			`* 3) Intel 82077 controller manual`
22			`*/`
23			`struct sun_flpy_controller {`
24			`volatile unsigned char status_82072; /* Main Status reg. */`
25			`#define dcr_82072 status_82072 /* Digital Control reg. */`
26			`#define status1_82077 status_82072 /* Auxiliary Status reg. 1 */`
27
28			`volatile unsigned char data_82072; /* Data fifo. */`
29			`#define status2_82077 data_82072 /* Auxiliary Status reg. 2 */`
30
31			`volatile unsigned char dor_82077; /* Digital Output reg. */`
32			`volatile unsigned char tapectl_82077; /* What the? Tape control reg? */`
33
34			`volatile unsigned char status_82077; /* Main Status Register. */`
35			`#define drs_82077 status_82077 /* Digital Rate Select reg. */`
36
37			`volatile unsigned char data_82077; /* Data fifo. */`
38			`volatile unsigned char ___unused;`
39			`volatile unsigned char dir_82077; /* Digital Input reg. */`
40			`#define dcr_82077 dir_82077 /* Config Control reg. */`
41			`};`
42
43			`/* You'll only ever find one controller on a SparcStation anyways. */`
44			`static struct sun_flpy_controller *sun_fdc = NULL;`
45			`volatile unsigned char *fdc_status;`
46
47			`struct sun_floppy_ops {`
48			`unsigned char (*fd_inb)(int port);`
49			`void (*fd_outb)(unsigned char value, int port);`
50			`};`
51
52			`static struct sun_floppy_ops sun_fdops;`
53
54			`#define fd_inb(port) sun_fdops.fd_inb(port)`
55			`#define fd_outb(value,port) sun_fdops.fd_outb(value,port)`
56			`#define fd_enable_dma() sun_fd_enable_dma()`
57			`#define fd_disable_dma() sun_fd_disable_dma()`
58			`#define fd_request_dma() (0) /* nothing... */`
59			`#define fd_free_dma() /* nothing... */`
60			`#define fd_clear_dma_ff() /* nothing... */`
61			`#define fd_set_dma_mode(mode) sun_fd_set_dma_mode(mode)`
62			`#define fd_set_dma_addr(addr) sun_fd_set_dma_addr(addr)`
63			`#define fd_set_dma_count(count) sun_fd_set_dma_count(count)`
64			`#define fd_enable_irq() /* nothing... */`
65			`#define fd_disable_irq() /* nothing... */`
66			`#define fd_cacheflush(addr, size) /* nothing... */`
67			`#define fd_request_irq() sun_fd_request_irq()`
68			`#define fd_free_irq() /* nothing... */`
69			`#if 0 /* P3: added by Alain, these cause a MMU corruption. 19960524 XXX */`
70			`#define fd_dma_mem_alloc(size) ((unsigned long) vmalloc(size))`
71			`#define fd_dma_mem_free(addr,size) (vfree((void *)(addr)))`
72			`#endif`
73
74			`#define FLOPPY_MOTOR_MASK 0x10`
75
76			`/* It's all the same... */`
77			`#define virt_to_bus(x) (x)`
78			`#define bus_to_virt(x) (x)`
79
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			`static int FDC2=-1;`
96
97			`#define N_FDC 1`
98			`#define N_DRIVE 8`
99
100			`/* No 64k boundary crossing problems on the Sparc. */`
101			`#define CROSS_64KB(a,s) (0)`
102
103			`/* Routines unique to each controller type on a Sun. */`
104			`static unsigned char sun_82072_fd_inb(int port)`
105			`{`
106			`switch(port & 7) {`
107			`default:`
108			`printk("floppy: Asked to read unknown port %d\n", port);`
109			`panic("floppy: Port bolixed.");`
110			`case 4: /* FD_STATUS */`
111			`return sun_fdc->status_82072 & ~STATUS_DMA;`
112			`case 5: /* FD_DATA */`
113			`return sun_fdc->data_82072;`
114			`case 7: /* FD_DIR */`
115			`return (*AUXREG & AUXIO_FLPY_DCHG)? 0x80: 0;`
116			`};`
117			`panic("sun_82072_fd_inb: How did I get here?");`
118			`}`
119
120			`static void sun_82072_fd_outb(unsigned char value, int port)`
121			`{`
122			`switch(port & 7) {`
123			`default:`
124			`printk("floppy: Asked to write to unknown port %d\n", port);`
125			`panic("floppy: Port bolixed.");`
126			`case 2: /* FD_DOR */`
127			`/* Oh geese, 82072 on the Sun has no DOR register,`
128			`* the functionality is implemented via the AUXIO`
129			`* I/O register. So we must emulate the behavior.`
130			`*`
131			`* ASSUMPTIONS: There will only ever be one floppy`
132			`* drive attached to a Sun controller`
133			`* and it will be at drive zero.`
134			`*/`
135			`{`
136			`unsigned bits = 0;`
137			`if (value & 0x10) bits \|= AUXIO_FLPY_DSEL;`
138			`if ((value & 0x80) == 0) bits \|= AUXIO_FLPY_EJCT;`
139			`set_auxio(bits, (~bits) & (AUXIO_FLPY_DSEL\|AUXIO_FLPY_EJCT));`
140			`}`
141			`break;`
142			`case 5: /* FD_DATA */`
143			`sun_fdc->data_82072 = value;`
144			`break;`
145			`case 7: /* FD_DCR */`
146			`sun_fdc->dcr_82072 = value;`
147			`break;`
148			`case 4: /* FD_STATUS */`
149			`sun_fdc->status_82072 = value;`
150			`break;`
151			`};`
152			`return;`
153			`}`
154
155			`static unsigned char sun_82077_fd_inb(int port)`
156			`{`
157			`switch(port & 7) {`
158			`default:`
159			`printk("floppy: Asked to read unknown port %d\n", port);`
160			`panic("floppy: Port bolixed.");`
161			`case 4: /* FD_STATUS */`
162			`return sun_fdc->status_82077 & ~STATUS_DMA;`
163			`case 5: /* FD_DATA */`
164			`return sun_fdc->data_82077;`
165			`case 7: /* FD_DIR */`
166			`/* XXX: Is DCL on 0x80 in sun4m? */`
167			`return sun_fdc->dir_82077;`
168			`};`
169			`panic("sun_82072_fd_inb: How did I get here?");`
170			`}`
171
172			`static void sun_82077_fd_outb(unsigned char value, int port)`
173			`{`
174			`switch(port & 7) {`
175			`default:`
176			`printk("floppy: Asked to write to unknown port %d\n", port);`
177			`panic("floppy: Port bolixed.");`
178			`case 2: /* FD_DOR */`
179			`/* Happily, the 82077 has a real DOR register. */`
180			`sun_fdc->dor_82077 = value;`
181			`break;`
182			`case 5: /* FD_DATA */`
183			`sun_fdc->data_82077 = value;`
184			`break;`
185			`case 7: /* FD_DCR */`
186			`sun_fdc->dcr_82077 = value;`
187			`break;`
188			`case 4: /* FD_STATUS */`
189			`sun_fdc->status_82077 = value;`
190			`break;`
191			`};`
192			`return;`
193			`}`
194
195			`/* For pseudo-dma (Sun floppy drives have no real DMA available to`
196			`* them so we must eat the data fifo bytes directly ourselves) we have`
197			`* three state variables. doing_pdma tells our inline low-level`
198			`* assembly floppy interrupt entry point whether it should sit and eat`
199			`* bytes from the fifo or just transfer control up to the higher level`
200			`* floppy interrupt c-code. I tried very hard but I could not get the`
201			`* pseudo-dma to work in c-code without getting many overruns and`
202			`* underruns. If non-zero, doing_pdma encodes the direction of`
203			`* the transfer for debugging. 1=read 2=write`
204			`*/`
205			`char *pdma_vaddr;`
206			`unsigned long pdma_size;`
207			`volatile int doing_pdma = 0;`
208
209			`/* This is software state */`
210			`char *pdma_base = 0;`
211			`unsigned long pdma_areasize;`
212
213			`/* Common routines to all controller types on the Sparc. */`
214			`static inline void virtual_dma_init(void)`
215			`{`
216			`/* nothing... */`
217			`}`
218
219			`static inline void sun_fd_disable_dma(void)`
220			`{`
221			`doing_pdma = 0;`
222			`if (pdma_base) {`
223			`mmu_unlockarea(pdma_base, pdma_areasize);`
224			`pdma_base = 0;`
225			`}`
226			`}`
227
228			`static inline void sun_fd_set_dma_mode(int mode)`
229			`{`
230			`switch(mode) {`
231			`case DMA_MODE_READ:`
232			`doing_pdma = 1;`
233			`break;`
234			`case DMA_MODE_WRITE:`
235			`doing_pdma = 2;`
236			`break;`
237			`default:`
238			`printk("Unknown dma mode %d\n", mode);`
239			`panic("floppy: Giving up...");`
240			`}`
241			`}`
242
243			`static inline void sun_fd_set_dma_addr(char *buffer)`
244			`{`
245			`pdma_vaddr = buffer;`
246			`}`
247
248			`static inline void sun_fd_set_dma_count(int length)`
249			`{`
250			`pdma_size = length;`
251			`}`
252
253			`static inline void sun_fd_enable_dma(void)`
254			`{`
255			`pdma_vaddr = mmu_lockarea(pdma_vaddr, pdma_size);`
256			`pdma_base = pdma_vaddr;`
257			`pdma_areasize = pdma_size;`
258			`}`
259
260			`/* Our low-level entry point in arch/sparc/kernel/entry.S */`
261			`extern void floppy_hardint(int irq, void unused, struct pt_regs regs);`
262
263			`static int sun_fd_request_irq(void)`
264			`{`
265			`static int once = 0;`
266			`int error;`
267
268			`if(!once) {`
269			`once = 1;`
270			`error = request_fast_irq(FLOPPY_IRQ, floppy_hardint, SA_INTERRUPT, "floppy");`
271			`return ((error == 0) ? 0 : -1);`
272			`} else return 0;`
273			`}`
274
275			`static struct linux_prom_registers fd_regs[2];`
276
277			`static int sun_floppy_init(void)`
278			`{`
279			`char state[128];`
280			`int tnode, fd_node, num_regs;`
281
282			`use_virtual_dma = 1;`
283
284			`FLOPPY_IRQ = 11;`
285			`/* Forget it if we aren't on a machine that could possibly`
286			`* ever have a floppy drive.`
287			`*/`
288			`if((sparc_cpu_model != sun4c && sparc_cpu_model != sun4m) \|\|`
289			`((idprom->id_machtype == (SM_SUN4C \| SM_4C_SLC)) \|\|`
290			`(idprom->id_machtype == (SM_SUN4C \| SM_4C_ELC)))) {`
291			`/* We certainly don't have a floppy controller. */`
292			`goto no_sun_fdc;`
293			`}`
294			`/* Well, try to find one. */`
295			`tnode = prom_getchild(prom_root_node);`
296			`fd_node = prom_searchsiblings(tnode, "obio");`
297			`if(fd_node != 0) {`
298			`tnode = prom_getchild(fd_node);`
299			`fd_node = prom_searchsiblings(tnode, "SUNW,fdtwo");`
300			`} else {`
301			`fd_node = prom_searchsiblings(tnode, "fd");`
302			`}`
303			`if(fd_node == 0) {`
304			`goto no_sun_fdc;`
305			`}`
306
307			`/* The sun4m lets us know if the controller is actually usable. */`
308			`if(sparc_cpu_model == sun4m) {`
309			`prom_getproperty(fd_node, "status", state, sizeof(state));`
310			`if(!strcmp(state, "disabled")) {`
311			`goto no_sun_fdc;`
312			`}`
313			`}`
314			`num_regs = prom_getproperty(fd_node, "reg", (char *) fd_regs, sizeof(fd_regs));`
315			`num_regs = (num_regs / sizeof(fd_regs[0]));`
316			`prom_apply_obio_ranges(fd_regs, num_regs);`
317			`sun_fdc = (struct sun_flpy_controller *) sparc_alloc_io(fd_regs[0].phys_addr,`
318			`0x0,`
319			`fd_regs[0].reg_size,`
320			`"floppy",`
321			`fd_regs[0].which_io,`
322			`0x0);`
323			`/* Last minute sanity check... */`
324			`if(sun_fdc->status_82072 == 0xff) {`
325			`sun_fdc = NULL;`
326			`goto no_sun_fdc;`
327			`}`
328
329			`if(sparc_cpu_model == sun4c) {`
330			`sun_fdops.fd_inb = sun_82072_fd_inb;`
331			`sun_fdops.fd_outb = sun_82072_fd_outb;`
332			`fdc_status = &sun_fdc->status_82072;`
333			`/* printk("AUXIO @0x%p\n", auxio_register); / / P3 */`
334			`} else {`
335			`sun_fdops.fd_inb = sun_82077_fd_inb;`
336			`sun_fdops.fd_outb = sun_82077_fd_outb;`
337			`fdc_status = &sun_fdc->status_82077;`
338			`/* printk("DOR @0x%p\n", &sun_fdc->dor_82077); / / P3 */`
339			`}`
340
341			`/* Success... */`
342			`return (int) sun_fdc;`
343
344			`no_sun_fdc:`
345			`return -1;`
346			`}`
347
348			`static int sparc_eject(void)`
349			`{`
350			`set_dor(0, ~0, 0x90);`
351			`udelay(500);`
352			`set_dor(0, ~0x90, 0);`
353			`udelay(500);`
354			`return 0;`
355			`}`
356
357			`#define fd_eject(drive) sparc_eject()`
358
359			`#endif /* !(__ASM_SPARC_FLOPPY_H) */`