1 /* asm-sparc/floppy.h: Sparc specific parts of the Floppy driver.
3 * Copyright (C) 1995 David S. Miller (davem@caip.rutgers.edu)
6 #ifndef __ASM_SPARC_FLOPPY_H
7 #define __ASM_SPARC_FLOPPY_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>
18 /* We don't need no stinkin' I/O port allocation crap. */
21 #define release_region(X, Y) do { } while(0)
22 #define request_region(X, Y, Z) (1)
25 * 1) Netbsd Sun floppy driver.
26 * 2) NCR 82077 controller manual
27 * 3) Intel 82077 controller manual
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 */
34 volatile unsigned char data_82072; /* Data fifo. */
35 #define status2_82077 data_82072 /* Auxiliary Status reg. 2 */
37 volatile unsigned char dor_82077; /* Digital Output reg. */
38 volatile unsigned char tapectl_82077; /* What the? Tape control reg? */
40 volatile unsigned char status_82077; /* Main Status Register. */
41 #define drs_82077 status_82077 /* Digital Rate Select reg. */
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. */
49 /* You'll only ever find one controller on a SparcStation anyways. */
50 static struct sun_flpy_controller *sun_fdc = NULL;
51 volatile unsigned char *fdc_status;
53 struct sun_floppy_ops {
54 unsigned char (*fd_inb)(int port);
55 void (*fd_outb)(unsigned char value, int port);
58 static struct sun_floppy_ops sun_fdops;
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)))
80 #define FLOPPY_MOTOR_MASK 0x10
82 /* XXX This isn't really correct. XXX */
83 #define get_dma_residue(x) (0)
85 #define FLOPPY0_TYPE 4
86 #define FLOPPY1_TYPE 0
88 /* Super paranoid... */
89 #undef HAVE_DISABLE_HLT
91 /* Here is where we catch the floppy driver trying to initialize,
92 * therefore this is where we call the PROM device tree probing
93 * routine etc. on the Sparc.
95 #define FDC1 sun_floppy_init()
100 /* No 64k boundary crossing problems on the Sparc. */
101 #define CROSS_64KB(a,s) (0)
103 /* Routines unique to each controller type on a Sun. */
104 static unsigned char sun_82072_fd_inb(int port)
109 printk("floppy: Asked to read unknown port %d\n", port);
110 panic("floppy: Port bolixed.");
111 case 4: /* FD_STATUS */
112 return sun_fdc->status_82072 & ~STATUS_DMA;
113 case 5: /* FD_DATA */
114 return sun_fdc->data_82072;
116 return (get_auxio() & AUXIO_FLPY_DCHG)? 0x80: 0;
118 panic("sun_82072_fd_inb: How did I get here?");
121 static void sun_82072_fd_outb(unsigned char value, int port)
126 printk("floppy: Asked to write to unknown port %d\n", port);
127 panic("floppy: Port bolixed.");
129 /* Oh geese, 82072 on the Sun has no DOR register,
130 * the functionality is implemented via the AUXIO
131 * I/O register. So we must emulate the behavior.
133 * ASSUMPTIONS: There will only ever be one floppy
134 * drive attached to a Sun controller
135 * and it will be at drive zero.
139 if (value & 0x10) bits |= AUXIO_FLPY_DSEL;
140 if ((value & 0x80) == 0) bits |= AUXIO_FLPY_EJCT;
141 set_auxio(bits, (~bits) & (AUXIO_FLPY_DSEL|AUXIO_FLPY_EJCT));
144 case 5: /* FD_DATA */
145 sun_fdc->data_82072 = value;
148 sun_fdc->dcr_82072 = value;
150 case 4: /* FD_STATUS */
151 sun_fdc->status_82072 = value;
157 static unsigned char sun_82077_fd_inb(int port)
162 printk("floppy: Asked to read unknown port %d\n", port);
163 panic("floppy: Port bolixed.");
164 case 4: /* FD_STATUS */
165 return sun_fdc->status_82077 & ~STATUS_DMA;
166 case 5: /* FD_DATA */
167 return sun_fdc->data_82077;
169 /* XXX: Is DCL on 0x80 in sun4m? */
170 return sun_fdc->dir_82077;
172 panic("sun_82072_fd_inb: How did I get here?");
175 static void sun_82077_fd_outb(unsigned char value, int port)
180 printk("floppy: Asked to write to unknown port %d\n", port);
181 panic("floppy: Port bolixed.");
183 /* Happily, the 82077 has a real DOR register. */
184 sun_fdc->dor_82077 = value;
186 case 5: /* FD_DATA */
187 sun_fdc->data_82077 = value;
190 sun_fdc->dcr_82077 = value;
192 case 4: /* FD_STATUS */
193 sun_fdc->status_82077 = value;
199 /* For pseudo-dma (Sun floppy drives have no real DMA available to
200 * them so we must eat the data fifo bytes directly ourselves) we have
201 * three state variables. doing_pdma tells our inline low-level
202 * assembly floppy interrupt entry point whether it should sit and eat
203 * bytes from the fifo or just transfer control up to the higher level
204 * floppy interrupt c-code. I tried very hard but I could not get the
205 * pseudo-dma to work in c-code without getting many overruns and
206 * underruns. If non-zero, doing_pdma encodes the direction of
207 * the transfer for debugging. 1=read 2=write
210 unsigned long pdma_size;
211 volatile int doing_pdma = 0;
213 /* This is software state */
214 char *pdma_base = NULL;
215 unsigned long pdma_areasize;
217 /* Common routines to all controller types on the Sparc. */
218 static __inline__ void virtual_dma_init(void)
223 static __inline__ void sun_fd_disable_dma(void)
227 mmu_unlockarea(pdma_base, pdma_areasize);
232 static __inline__ void sun_fd_set_dma_mode(int mode)
242 printk("Unknown dma mode %d\n", mode);
243 panic("floppy: Giving up...");
247 static __inline__ void sun_fd_set_dma_addr(char *buffer)
252 static __inline__ void sun_fd_set_dma_count(int length)
257 static __inline__ void sun_fd_enable_dma(void)
259 pdma_vaddr = mmu_lockarea(pdma_vaddr, pdma_size);
260 pdma_base = pdma_vaddr;
261 pdma_areasize = pdma_size;
264 /* Our low-level entry point in arch/sparc/kernel/entry.S */
265 irqreturn_t floppy_hardint(int irq, void *unused);
267 static int sun_fd_request_irq(void)
274 error = request_fast_irq(FLOPPY_IRQ, floppy_hardint,
275 IRQF_DISABLED, "floppy");
276 return ((error == 0) ? 0 : -1);
280 static struct linux_prom_registers fd_regs[2];
282 static int sun_floppy_init(void)
285 int tnode, fd_node, num_regs;
291 /* Forget it if we aren't on a machine that could possibly
292 * ever have a floppy drive.
294 if((sparc_cpu_model != sun4c && sparc_cpu_model != sun4m) ||
295 ((idprom->id_machtype == (SM_SUN4C | SM_4C_SLC)) ||
296 (idprom->id_machtype == (SM_SUN4C | SM_4C_ELC)))) {
297 /* We certainly don't have a floppy controller. */
300 /* Well, try to find one. */
301 tnode = prom_getchild(prom_root_node);
302 fd_node = prom_searchsiblings(tnode, "obio");
304 tnode = prom_getchild(fd_node);
305 fd_node = prom_searchsiblings(tnode, "SUNW,fdtwo");
307 fd_node = prom_searchsiblings(tnode, "fd");
313 /* The sun4m lets us know if the controller is actually usable. */
314 if(sparc_cpu_model == sun4m &&
315 prom_getproperty(fd_node, "status", state, sizeof(state)) != -1) {
316 if(!strcmp(state, "disabled")) {
320 num_regs = prom_getproperty(fd_node, "reg", (char *) fd_regs, sizeof(fd_regs));
321 num_regs = (num_regs / sizeof(fd_regs[0]));
322 prom_apply_obio_ranges(fd_regs, num_regs);
323 memset(&r, 0, sizeof(r));
324 r.flags = fd_regs[0].which_io;
325 r.start = fd_regs[0].phys_addr;
326 sun_fdc = (struct sun_flpy_controller *)
327 sbus_ioremap(&r, 0, fd_regs[0].reg_size, "floppy");
329 /* Last minute sanity check... */
330 if(sun_fdc->status_82072 == 0xff) {
335 if(sparc_cpu_model == sun4c) {
336 sun_fdops.fd_inb = sun_82072_fd_inb;
337 sun_fdops.fd_outb = sun_82072_fd_outb;
338 fdc_status = &sun_fdc->status_82072;
339 /* printk("AUXIO @0x%lx\n", auxio_register); */ /* P3 */
341 sun_fdops.fd_inb = sun_82077_fd_inb;
342 sun_fdops.fd_outb = sun_82077_fd_outb;
343 fdc_status = &sun_fdc->status_82077;
344 /* printk("DOR @0x%p\n", &sun_fdc->dor_82077); */ /* P3 */
348 allowed_drive_mask = 0x01;
349 return (int) sun_fdc;
355 static int sparc_eject(void)
357 set_dor(0x00, 0xff, 0x90);
359 set_dor(0x00, 0x6f, 0x00);
364 #define fd_eject(drive) sparc_eject()
366 #define EXTRA_FLOPPY_PARAMS
368 #endif /* !(__ASM_SPARC_FLOPPY_H) */