File: /usr/src/linux/include/asm-sparc/floppy.h
1 /* 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 /* We don't need no stinkin' I/O port allocation crap. */
19 #undef release_region
20 #undef check_region
21 #undef request_region
22 #define release_region(X, Y) do { } while(0)
23 #define check_region(X, Y) (0)
24 #define request_region(X, Y, Z) (1)
25
26 /* References:
27 * 1) Netbsd Sun floppy driver.
28 * 2) NCR 82077 controller manual
29 * 3) Intel 82077 controller manual
30 */
31 struct sun_flpy_controller {
32 volatile unsigned char status_82072; /* Main Status reg. */
33 #define dcr_82072 status_82072 /* Digital Control reg. */
34 #define status1_82077 status_82072 /* Auxiliary Status reg. 1 */
35
36 volatile unsigned char data_82072; /* Data fifo. */
37 #define status2_82077 data_82072 /* Auxiliary Status reg. 2 */
38
39 volatile unsigned char dor_82077; /* Digital Output reg. */
40 volatile unsigned char tapectl_82077; /* What the? Tape control reg? */
41
42 volatile unsigned char status_82077; /* Main Status Register. */
43 #define drs_82077 status_82077 /* Digital Rate Select reg. */
44
45 volatile unsigned char data_82077; /* Data fifo. */
46 volatile unsigned char ___unused;
47 volatile unsigned char dir_82077; /* Digital Input reg. */
48 #define dcr_82077 dir_82077 /* Config Control reg. */
49 };
50
51 /* You'll only ever find one controller on a SparcStation anyways. */
52 static struct sun_flpy_controller *sun_fdc = NULL;
53 volatile unsigned char *fdc_status;
54
55 struct sun_floppy_ops {
56 unsigned char (*fd_inb)(int port);
57 void (*fd_outb)(unsigned char value, int port);
58 };
59
60 static struct sun_floppy_ops sun_fdops;
61
62 #define fd_inb(port) sun_fdops.fd_inb(port)
63 #define fd_outb(value,port) sun_fdops.fd_outb(value,port)
64 #define fd_enable_dma() sun_fd_enable_dma()
65 #define fd_disable_dma() sun_fd_disable_dma()
66 #define fd_request_dma() (0) /* nothing... */
67 #define fd_free_dma() /* nothing... */
68 #define fd_clear_dma_ff() /* nothing... */
69 #define fd_set_dma_mode(mode) sun_fd_set_dma_mode(mode)
70 #define fd_set_dma_addr(addr) sun_fd_set_dma_addr(addr)
71 #define fd_set_dma_count(count) sun_fd_set_dma_count(count)
72 #define fd_enable_irq() /* nothing... */
73 #define fd_disable_irq() /* nothing... */
74 #define fd_cacheflush(addr, size) /* nothing... */
75 #define fd_request_irq() sun_fd_request_irq()
76 #define fd_free_irq() /* nothing... */
77 #if 0 /* P3: added by Alain, these cause a MMU corruption. 19960524 XXX */
78 #define fd_dma_mem_alloc(size) ((unsigned long) vmalloc(size))
79 #define fd_dma_mem_free(addr,size) (vfree((void *)(addr)))
80 #endif
81
82 #define FLOPPY_MOTOR_MASK 0x10
83
84 /* XXX This isn't really correct. XXX */
85 #define get_dma_residue(x) (0)
86
87 #define FLOPPY0_TYPE 4
88 #define FLOPPY1_TYPE 0
89
90 /* Super paranoid... */
91 #undef HAVE_DISABLE_HLT
92
93 /* Here is where we catch the floppy driver trying to initialize,
94 * therefore this is where we call the PROM device tree probing
95 * routine etc. on the Sparc.
96 */
97 #define FDC1 sun_floppy_init()
98
99 static int FDC2=-1;
100
101 #define N_FDC 1
102 #define N_DRIVE 8
103
104 /* No 64k boundary crossing problems on the Sparc. */
105 #define CROSS_64KB(a,s) (0)
106
107 /* Routines unique to each controller type on a Sun. */
108 static unsigned char sun_82072_fd_inb(int port)
109 {
110 udelay(5);
111 switch(port & 7) {
112 default:
113 printk("floppy: Asked to read unknown port %d\n", port);
114 panic("floppy: Port bolixed.");
115 case 4: /* FD_STATUS */
116 return sun_fdc->status_82072 & ~STATUS_DMA;
117 case 5: /* FD_DATA */
118 return sun_fdc->data_82072;
119 case 7: /* FD_DIR */
120 return (*AUXREG & AUXIO_FLPY_DCHG)? 0x80: 0;
121 };
122 panic("sun_82072_fd_inb: How did I get here?");
123 }
124
125 static void sun_82072_fd_outb(unsigned char value, int port)
126 {
127 udelay(5);
128 switch(port & 7) {
129 default:
130 printk("floppy: Asked to write to unknown port %d\n", port);
131 panic("floppy: Port bolixed.");
132 case 2: /* FD_DOR */
133 /* Oh geese, 82072 on the Sun has no DOR register,
134 * the functionality is implemented via the AUXIO
135 * I/O register. So we must emulate the behavior.
136 *
137 * ASSUMPTIONS: There will only ever be one floppy
138 * drive attached to a Sun controller
139 * and it will be at drive zero.
140 */
141 {
142 unsigned bits = 0;
143 if (value & 0x10) bits |= AUXIO_FLPY_DSEL;
144 if ((value & 0x80) == 0) bits |= AUXIO_FLPY_EJCT;
145 set_auxio(bits, (~bits) & (AUXIO_FLPY_DSEL|AUXIO_FLPY_EJCT));
146 }
147 break;
148 case 5: /* FD_DATA */
149 sun_fdc->data_82072 = value;
150 break;
151 case 7: /* FD_DCR */
152 sun_fdc->dcr_82072 = value;
153 break;
154 case 4: /* FD_STATUS */
155 sun_fdc->status_82072 = value;
156 break;
157 };
158 return;
159 }
160
161 static unsigned char sun_82077_fd_inb(int port)
162 {
163 udelay(5);
164 switch(port & 7) {
165 default:
166 printk("floppy: Asked to read unknown port %d\n", port);
167 panic("floppy: Port bolixed.");
168 case 4: /* FD_STATUS */
169 return sun_fdc->status_82077 & ~STATUS_DMA;
170 case 5: /* FD_DATA */
171 return sun_fdc->data_82077;
172 case 7: /* FD_DIR */
173 /* XXX: Is DCL on 0x80 in sun4m? */
174 return sun_fdc->dir_82077;
175 };
176 panic("sun_82072_fd_inb: How did I get here?");
177 }
178
179 static void sun_82077_fd_outb(unsigned char value, int port)
180 {
181 udelay(5);
182 switch(port & 7) {
183 default:
184 printk("floppy: Asked to write to unknown port %d\n", port);
185 panic("floppy: Port bolixed.");
186 case 2: /* FD_DOR */
187 /* Happily, the 82077 has a real DOR register. */
188 sun_fdc->dor_82077 = value;
189 break;
190 case 5: /* FD_DATA */
191 sun_fdc->data_82077 = value;
192 break;
193 case 7: /* FD_DCR */
194 sun_fdc->dcr_82077 = value;
195 break;
196 case 4: /* FD_STATUS */
197 sun_fdc->status_82077 = value;
198 break;
199 };
200 return;
201 }
202
203 /* For pseudo-dma (Sun floppy drives have no real DMA available to
204 * them so we must eat the data fifo bytes directly ourselves) we have
205 * three state variables. doing_pdma tells our inline low-level
206 * assembly floppy interrupt entry point whether it should sit and eat
207 * bytes from the fifo or just transfer control up to the higher level
208 * floppy interrupt c-code. I tried very hard but I could not get the
209 * pseudo-dma to work in c-code without getting many overruns and
210 * underruns. If non-zero, doing_pdma encodes the direction of
211 * the transfer for debugging. 1=read 2=write
212 */
213 char *pdma_vaddr;
214 unsigned long pdma_size;
215 volatile int doing_pdma = 0;
216
217 /* This is software state */
218 char *pdma_base = 0;
219 unsigned long pdma_areasize;
220
221 /* Common routines to all controller types on the Sparc. */
222 static __inline__ void virtual_dma_init(void)
223 {
224 /* nothing... */
225 }
226
227 static __inline__ void sun_fd_disable_dma(void)
228 {
229 doing_pdma = 0;
230 if (pdma_base) {
231 mmu_unlockarea(pdma_base, pdma_areasize);
232 pdma_base = 0;
233 }
234 }
235
236 static __inline__ void sun_fd_set_dma_mode(int mode)
237 {
238 switch(mode) {
239 case DMA_MODE_READ:
240 doing_pdma = 1;
241 break;
242 case DMA_MODE_WRITE:
243 doing_pdma = 2;
244 break;
245 default:
246 printk("Unknown dma mode %d\n", mode);
247 panic("floppy: Giving up...");
248 }
249 }
250
251 static __inline__ void sun_fd_set_dma_addr(char *buffer)
252 {
253 pdma_vaddr = buffer;
254 }
255
256 static __inline__ void sun_fd_set_dma_count(int length)
257 {
258 pdma_size = length;
259 }
260
261 static __inline__ void sun_fd_enable_dma(void)
262 {
263 pdma_vaddr = mmu_lockarea(pdma_vaddr, pdma_size);
264 pdma_base = pdma_vaddr;
265 pdma_areasize = pdma_size;
266 }
267
268 /* Our low-level entry point in arch/sparc/kernel/entry.S */
269 extern void floppy_hardint(int irq, void *unused, struct pt_regs *regs);
270
271 static int sun_fd_request_irq(void)
272 {
273 static int once = 0;
274 int error;
275
276 if(!once) {
277 once = 1;
278 error = request_fast_irq(FLOPPY_IRQ, floppy_hardint, SA_INTERRUPT, "floppy");
279 return ((error == 0) ? 0 : -1);
280 } else return 0;
281 }
282
283 static struct linux_prom_registers fd_regs[2];
284
285 static int sun_floppy_init(void)
286 {
287 char state[128];
288 int tnode, fd_node, num_regs;
289 struct resource r;
290
291 use_virtual_dma = 1;
292
293 FLOPPY_IRQ = 11;
294 /* Forget it if we aren't on a machine that could possibly
295 * ever have a floppy drive.
296 */
297 if((sparc_cpu_model != sun4c && sparc_cpu_model != sun4m) ||
298 ((idprom->id_machtype == (SM_SUN4C | SM_4C_SLC)) ||
299 (idprom->id_machtype == (SM_SUN4C | SM_4C_ELC)))) {
300 /* We certainly don't have a floppy controller. */
301 goto no_sun_fdc;
302 }
303 /* Well, try to find one. */
304 tnode = prom_getchild(prom_root_node);
305 fd_node = prom_searchsiblings(tnode, "obio");
306 if(fd_node != 0) {
307 tnode = prom_getchild(fd_node);
308 fd_node = prom_searchsiblings(tnode, "SUNW,fdtwo");
309 } else {
310 fd_node = prom_searchsiblings(tnode, "fd");
311 }
312 if(fd_node == 0) {
313 goto no_sun_fdc;
314 }
315
316 /* The sun4m lets us know if the controller is actually usable. */
317 if(sparc_cpu_model == sun4m) {
318 prom_getproperty(fd_node, "status", state, sizeof(state));
319 if(!strcmp(state, "disabled")) {
320 goto no_sun_fdc;
321 }
322 }
323 num_regs = prom_getproperty(fd_node, "reg", (char *) fd_regs, sizeof(fd_regs));
324 num_regs = (num_regs / sizeof(fd_regs[0]));
325 prom_apply_obio_ranges(fd_regs, num_regs);
326 memset(&r, 0, sizeof(r));
327 r.flags = fd_regs[0].which_io;
328 r.start = fd_regs[0].phys_addr;
329 sun_fdc = (struct sun_flpy_controller *)
330 sbus_ioremap(&r, 0, fd_regs[0].reg_size, "floppy");
331
332 /* Last minute sanity check... */
333 if(sun_fdc->status_82072 == 0xff) {
334 sun_fdc = NULL;
335 goto no_sun_fdc;
336 }
337
338 if(sparc_cpu_model == sun4c) {
339 sun_fdops.fd_inb = sun_82072_fd_inb;
340 sun_fdops.fd_outb = sun_82072_fd_outb;
341 fdc_status = &sun_fdc->status_82072;
342 /* printk("AUXIO @0x%p\n", auxio_register); */ /* P3 */
343 } else {
344 sun_fdops.fd_inb = sun_82077_fd_inb;
345 sun_fdops.fd_outb = sun_82077_fd_outb;
346 fdc_status = &sun_fdc->status_82077;
347 /* printk("DOR @0x%p\n", &sun_fdc->dor_82077); */ /* P3 */
348 }
349
350 /* Success... */
351 allowed_drive_mask = 0x01;
352 return (int) sun_fdc;
353
354 no_sun_fdc:
355 return -1;
356 }
357
358 static int sparc_eject(void)
359 {
360 set_dor(0x00, 0xff, 0x90);
361 udelay(500);
362 set_dor(0x00, 0x6f, 0x00);
363 udelay(500);
364 return 0;
365 }
366
367 #define fd_eject(drive) sparc_eject()
368
369 #endif /* !(__ASM_SPARC_FLOPPY_H) */
370