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Linux/arch/sparc/include/asm/floppy_32.h

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  1 /* asm/floppy.h: Sparc specific parts of the Floppy driver.
  2  *
  3  * Copyright (C) 1995 David S. Miller (davem@davemloft.net)
  4  */
  5 
  6 #ifndef __ASM_SPARC_FLOPPY_H
  7 #define __ASM_SPARC_FLOPPY_H
  8 
  9 #include <linux/of.h>
 10 #include <linux/of_device.h>
 11 
 12 #include <asm/page.h>
 13 #include <asm/pgtable.h>
 14 #include <asm/idprom.h>
 15 #include <asm/oplib.h>
 16 #include <asm/auxio.h>
 17 #include <asm/irq.h>
 18 
 19 /* We don't need no stinkin' I/O port allocation crap. */
 20 #undef release_region
 21 #undef request_region
 22 #define release_region(X, Y)    do { } while(0)
 23 #define request_region(X, Y, Z) (1)
 24 
 25 /* References:
 26  * 1) Netbsd Sun floppy driver.
 27  * 2) NCR 82077 controller manual
 28  * 3) Intel 82077 controller manual
 29  */
 30 struct sun_flpy_controller {
 31         volatile unsigned char status_82072;  /* Main Status reg. */
 32 #define dcr_82072              status_82072   /* Digital Control reg. */
 33 #define status1_82077          status_82072   /* Auxiliary Status reg. 1 */
 34 
 35         volatile unsigned char data_82072;    /* Data fifo. */
 36 #define status2_82077          data_82072     /* Auxiliary Status reg. 2 */
 37 
 38         volatile unsigned char dor_82077;     /* Digital Output reg. */
 39         volatile unsigned char tapectl_82077; /* What the? Tape control reg? */
 40 
 41         volatile unsigned char status_82077;  /* Main Status Register. */
 42 #define drs_82077              status_82077   /* Digital Rate Select reg. */
 43 
 44         volatile unsigned char data_82077;    /* Data fifo. */
 45         volatile unsigned char ___unused;
 46         volatile unsigned char dir_82077;     /* Digital Input reg. */
 47 #define dcr_82077              dir_82077      /* Config Control reg. */
 48 };
 49 
 50 /* You'll only ever find one controller on a SparcStation anyways. */
 51 static struct sun_flpy_controller *sun_fdc = NULL;
 52 extern volatile unsigned char *fdc_status;
 53 
 54 struct sun_floppy_ops {
 55         unsigned char (*fd_inb)(int port);
 56         void (*fd_outb)(unsigned char value, int port);
 57 };
 58 
 59 static struct sun_floppy_ops sun_fdops;
 60 
 61 #define fd_inb(port)              sun_fdops.fd_inb(port)
 62 #define fd_outb(value,port)       sun_fdops.fd_outb(value,port)
 63 #define fd_enable_dma()           sun_fd_enable_dma()
 64 #define fd_disable_dma()          sun_fd_disable_dma()
 65 #define fd_request_dma()          (0) /* nothing... */
 66 #define fd_free_dma()             /* nothing... */
 67 #define fd_clear_dma_ff()         /* nothing... */
 68 #define fd_set_dma_mode(mode)     sun_fd_set_dma_mode(mode)
 69 #define fd_set_dma_addr(addr)     sun_fd_set_dma_addr(addr)
 70 #define fd_set_dma_count(count)   sun_fd_set_dma_count(count)
 71 #define fd_enable_irq()           /* nothing... */
 72 #define fd_disable_irq()          /* nothing... */
 73 #define fd_cacheflush(addr, size) /* nothing... */
 74 #define fd_request_irq()          sun_fd_request_irq()
 75 #define fd_free_irq()             /* nothing... */
 76 #if 0  /* P3: added by Alain, these cause a MMU corruption. 19960524 XXX */
 77 #define fd_dma_mem_alloc(size)    ((unsigned long) vmalloc(size))
 78 #define fd_dma_mem_free(addr,size) (vfree((void *)(addr)))
 79 #endif
 80 
 81 /* XXX This isn't really correct. XXX */
 82 #define get_dma_residue(x)        (0)
 83 
 84 #define FLOPPY0_TYPE  4
 85 #define FLOPPY1_TYPE  0
 86 
 87 /* Super paranoid... */
 88 #undef HAVE_DISABLE_HLT
 89 
 90 /* Here is where we catch the floppy driver trying to initialize,
 91  * therefore this is where we call the PROM device tree probing
 92  * routine etc. on the Sparc.
 93  */
 94 #define FDC1                      sun_floppy_init()
 95 
 96 #define N_FDC    1
 97 #define N_DRIVE  8
 98 
 99 /* No 64k boundary crossing problems on the Sparc. */
100 #define CROSS_64KB(a,s) (0)
101 
102 /* Routines unique to each controller type on a Sun. */
103 static void sun_set_dor(unsigned char value, int fdc_82077)
104 {
105         if (fdc_82077)
106                 sun_fdc->dor_82077 = value;
107 }
108 
109 static unsigned char sun_read_dir(void)
110 {
111         return sun_fdc->dir_82077;
112 }
113 
114 static unsigned char sun_82072_fd_inb(int port)
115 {
116         udelay(5);
117         switch(port & 7) {
118         default:
119                 printk("floppy: Asked to read unknown port %d\n", port);
120                 panic("floppy: Port bolixed.");
121         case 4: /* FD_STATUS */
122                 return sun_fdc->status_82072 & ~STATUS_DMA;
123         case 5: /* FD_DATA */
124                 return sun_fdc->data_82072;
125         case 7: /* FD_DIR */
126                 return sun_read_dir();
127         }
128         panic("sun_82072_fd_inb: How did I get here?");
129 }
130 
131 static void sun_82072_fd_outb(unsigned char value, int port)
132 {
133         udelay(5);
134         switch(port & 7) {
135         default:
136                 printk("floppy: Asked to write to unknown port %d\n", port);
137                 panic("floppy: Port bolixed.");
138         case 2: /* FD_DOR */
139                 sun_set_dor(value, 0);
140                 break;
141         case 5: /* FD_DATA */
142                 sun_fdc->data_82072 = value;
143                 break;
144         case 7: /* FD_DCR */
145                 sun_fdc->dcr_82072 = value;
146                 break;
147         case 4: /* FD_STATUS */
148                 sun_fdc->status_82072 = value;
149                 break;
150         }
151         return;
152 }
153 
154 static unsigned char sun_82077_fd_inb(int port)
155 {
156         udelay(5);
157         switch(port & 7) {
158         default:
159                 printk("floppy: Asked to read unknown port %d\n", port);
160                 panic("floppy: Port bolixed.");
161         case 0: /* FD_STATUS_0 */
162                 return sun_fdc->status1_82077;
163         case 1: /* FD_STATUS_1 */
164                 return sun_fdc->status2_82077;
165         case 2: /* FD_DOR */
166                 return sun_fdc->dor_82077;
167         case 3: /* FD_TDR */
168                 return sun_fdc->tapectl_82077;
169         case 4: /* FD_STATUS */
170                 return sun_fdc->status_82077 & ~STATUS_DMA;
171         case 5: /* FD_DATA */
172                 return sun_fdc->data_82077;
173         case 7: /* FD_DIR */
174                 return sun_read_dir();
175         }
176         panic("sun_82077_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                 sun_set_dor(value, 1);
188                 break;
189         case 5: /* FD_DATA */
190                 sun_fdc->data_82077 = value;
191                 break;
192         case 7: /* FD_DCR */
193                 sun_fdc->dcr_82077 = value;
194                 break;
195         case 4: /* FD_STATUS */
196                 sun_fdc->status_82077 = value;
197                 break;
198         case 3: /* FD_TDR */
199                 sun_fdc->tapectl_82077 = value;
200                 break;
201         }
202         return;
203 }
204 
205 /* For pseudo-dma (Sun floppy drives have no real DMA available to
206  * them so we must eat the data fifo bytes directly ourselves) we have
207  * three state variables.  doing_pdma tells our inline low-level
208  * assembly floppy interrupt entry point whether it should sit and eat
209  * bytes from the fifo or just transfer control up to the higher level
210  * floppy interrupt c-code.  I tried very hard but I could not get the
211  * pseudo-dma to work in c-code without getting many overruns and
212  * underruns.  If non-zero, doing_pdma encodes the direction of
213  * the transfer for debugging.  1=read 2=write
214  */
215 extern char *pdma_vaddr;
216 extern unsigned long pdma_size;
217 extern volatile int doing_pdma;
218 
219 /* This is software state */
220 extern char *pdma_base;
221 extern unsigned long pdma_areasize;
222 
223 /* Common routines to all controller types on the Sparc. */
224 static inline void virtual_dma_init(void)
225 {
226         /* nothing... */
227 }
228 
229 static inline void sun_fd_disable_dma(void)
230 {
231         doing_pdma = 0;
232         pdma_base = NULL;
233 }
234 
235 static inline void sun_fd_set_dma_mode(int mode)
236 {
237         switch(mode) {
238         case DMA_MODE_READ:
239                 doing_pdma = 1;
240                 break;
241         case DMA_MODE_WRITE:
242                 doing_pdma = 2;
243                 break;
244         default:
245                 printk("Unknown dma mode %d\n", mode);
246                 panic("floppy: Giving up...");
247         }
248 }
249 
250 static inline void sun_fd_set_dma_addr(char *buffer)
251 {
252         pdma_vaddr = buffer;
253 }
254 
255 static inline void sun_fd_set_dma_count(int length)
256 {
257         pdma_size = length;
258 }
259 
260 static inline void sun_fd_enable_dma(void)
261 {
262         pdma_base = pdma_vaddr;
263         pdma_areasize = pdma_size;
264 }
265 
266 extern int sparc_floppy_request_irq(unsigned int irq,
267                                     irq_handler_t irq_handler);
268 
269 static int sun_fd_request_irq(void)
270 {
271         static int once = 0;
272 
273         if (!once) {
274                 once = 1;
275                 return sparc_floppy_request_irq(FLOPPY_IRQ, floppy_interrupt);
276         } else {
277                 return 0;
278         }
279 }
280 
281 static struct linux_prom_registers fd_regs[2];
282 
283 static int sun_floppy_init(void)
284 {
285         struct platform_device *op;
286         struct device_node *dp;
287         struct resource r;
288         char state[128];
289         phandle fd_node;
290         phandle tnode;
291         int num_regs;
292 
293         use_virtual_dma = 1;
294 
295         /* Forget it if we aren't on a machine that could possibly
296          * ever have a floppy drive.
297          */
298         if (sparc_cpu_model != sun4m) {
299                 /* We certainly don't have a floppy controller. */
300                 goto no_sun_fdc;
301         }
302         /* Well, try to find one. */
303         tnode = prom_getchild(prom_root_node);
304         fd_node = prom_searchsiblings(tnode, "obio");
305         if (fd_node != 0) {
306                 tnode = prom_getchild(fd_node);
307                 fd_node = prom_searchsiblings(tnode, "SUNW,fdtwo");
308         } else {
309                 fd_node = prom_searchsiblings(tnode, "fd");
310         }
311         if (fd_node == 0) {
312                 goto no_sun_fdc;
313         }
314 
315         /* The sun4m lets us know if the controller is actually usable. */
316         if (prom_getproperty(fd_node, "status", state, sizeof(state)) != -1) {
317                 if(!strcmp(state, "disabled")) {
318                         goto no_sun_fdc;
319                 }
320         }
321         num_regs = prom_getproperty(fd_node, "reg", (char *) fd_regs, sizeof(fd_regs));
322         num_regs = (num_regs / sizeof(fd_regs[0]));
323         prom_apply_obio_ranges(fd_regs, num_regs);
324         memset(&r, 0, sizeof(r));
325         r.flags = fd_regs[0].which_io;
326         r.start = fd_regs[0].phys_addr;
327         sun_fdc = of_ioremap(&r, 0, fd_regs[0].reg_size, "floppy");
328 
329         /* Look up irq in platform_device.
330          * We try "SUNW,fdtwo" and "fd"
331          */
332         op = NULL;
333         for_each_node_by_name(dp, "SUNW,fdtwo") {
334                 op = of_find_device_by_node(dp);
335                 if (op)
336                         break;
337         }
338         if (!op) {
339                 for_each_node_by_name(dp, "fd") {
340                         op = of_find_device_by_node(dp);
341                         if (op)
342                                 break;
343                 }
344         }
345         if (!op)
346                 goto no_sun_fdc;
347 
348         FLOPPY_IRQ = op->archdata.irqs[0];
349 
350         /* Last minute sanity check... */
351         if (sun_fdc->status_82072 == 0xff) {
352                 sun_fdc = NULL;
353                 goto no_sun_fdc;
354         }
355 
356         sun_fdops.fd_inb = sun_82077_fd_inb;
357         sun_fdops.fd_outb = sun_82077_fd_outb;
358         fdc_status = &sun_fdc->status_82077;
359 
360         if (sun_fdc->dor_82077 == 0x80) {
361                 sun_fdc->dor_82077 = 0x02;
362                 if (sun_fdc->dor_82077 == 0x80) {
363                         sun_fdops.fd_inb = sun_82072_fd_inb;
364                         sun_fdops.fd_outb = sun_82072_fd_outb;
365                         fdc_status = &sun_fdc->status_82072;
366                 }
367         }
368 
369         /* Success... */
370         allowed_drive_mask = 0x01;
371         return (int) sun_fdc;
372 
373 no_sun_fdc:
374         return -1;
375 }
376 
377 static int sparc_eject(void)
378 {
379         set_dor(0x00, 0xff, 0x90);
380         udelay(500);
381         set_dor(0x00, 0x6f, 0x00);
382         udelay(500);
383         return 0;
384 }
385 
386 #define fd_eject(drive) sparc_eject()
387 
388 #define EXTRA_FLOPPY_PARAMS
389 
390 static DEFINE_SPINLOCK(dma_spin_lock);
391 
392 #define claim_dma_lock() \
393 ({      unsigned long flags; \
394         spin_lock_irqsave(&dma_spin_lock, flags); \
395         flags; \
396 })
397 
398 #define release_dma_lock(__flags) \
399         spin_unlock_irqrestore(&dma_spin_lock, __flags);
400 
401 #endif /* !(__ASM_SPARC_FLOPPY_H) */
402 

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