root/include/asm-sparc/floppy.h

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INCLUDED FROM


DEFINITIONS

This source file includes following definitions.
  1. sun_82072_fd_inb
  2. sun_82072_fd_outb
  3. sun_82077_fd_inb
  4. sun_82077_fd_outb
  5. virtual_dma_init
  6. sun_fd_disable_dma
  7. sun_fd_set_dma_mode
  8. sun_fd_set_dma_addr
  9. sun_fd_set_dma_count
  10. sun_fd_enable_dma
  11. sun_fd_eject
  12. sun_fd_request_irq
  13. sun_floppy_init

   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 /* 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 #define fd_eject(x)               sun_fd_eject()
  70 
  71 #define FLOPPY_MOTOR_MASK         0x10
  72 
  73 /* It's all the same... */
  74 #define virt_to_bus(x)            (x)
  75 #define bus_to_virt(x)            (x)
  76 
  77 /* XXX This isn't really correct. XXX */
  78 #define get_dma_residue(x)        (0)
  79 
  80 #define FLOPPY0_TYPE  4
  81 #define FLOPPY1_TYPE  0
  82 
  83 /* Super paranoid... */
  84 #undef HAVE_DISABLE_HLT
  85 
  86 /* Here is where we catch the floppy driver trying to initialize,
  87  * therefore this is where we call the PROM device tree probing
  88  * routine etc. on the Sparc.
  89  */
  90 #define FDC1                      sun_floppy_init()
  91 
  92 static int FDC2=-1;
  93 
  94 #define N_FDC    1
  95 #define N_DRIVE  8
  96 
  97 /* No 64k boundary crossing problems on the Sparc. */
  98 #define CROSS_64KB(a,s) (0)
  99 
 100 /* Routines unique to each controller type on a Sun. */
 101 static unsigned char sun_82072_fd_inb(int port)
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 102 {
 103         switch(port & 7) {
 104         default:
 105                 printk("floppy: Asked to read unknown port %d\n", port);
 106                 panic("floppy: Port bolixed.");
 107         case 4: /* FD_STATUS */
 108                 return sun_fdc->status_82072 & ~STATUS_DMA;
 109         case 5: /* FD_DATA */
 110                 return sun_fdc->data_82072;
 111         case 7: /* FD_DIR */
 112                 /* Always return 0, the disk never changes
 113                  * without the kernel explicitly doing so.
 114                  */
 115                 return 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)
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 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 #if 0
 136                 if(value & 0xf0)
 137 #else
 138                 if(value & 0x10)
 139 #endif
 140                         set_auxio(AUXIO_FLPY_DSEL, 0);
 141                 else
 142                         set_auxio(0, AUXIO_FLPY_DSEL);
 143                 break;
 144         case 5: /* FD_DATA */
 145                 sun_fdc->data_82072 = value;
 146                 break;
 147         case 7: /* FD_DCR */
 148                 sun_fdc->dcr_82072 = value;
 149                 break;
 150         case 4: /* FD_STATUS */
 151                 sun_fdc->status_82072 = value;
 152                 break;
 153         };
 154         return;
 155 }
 156 
 157 static unsigned char sun_82077_fd_inb(int port)
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 158 {
 159         switch(port & 7) {
 160         default:
 161                 printk("floppy: Asked to read unknown port %d\n", port);
 162                 panic("floppy: Port bolixed.");
 163         case 4: /* FD_STATUS */
 164                 return sun_fdc->status_82077 & ~STATUS_DMA;
 165         case 5: /* FD_DATA */
 166                 return sun_fdc->data_82077;
 167         case 7: /* FD_DIR */
 168                 /* Always return 0, the disk never changes
 169                  * without the kernel explicitly ejecting it.
 170                  */
 171                 return 0;
 172         };
 173         panic("sun_82072_fd_inb: How did I get here?");
 174 }
 175 
 176 static void sun_82077_fd_outb(unsigned char value, int port)
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 177 {
 178         switch(port & 7) {
 179         default:
 180                 printk("floppy: Asked to write to unknown port %d\n", port);
 181                 panic("floppy: Port bolixed.");
 182         case 2: /* FD_DOR */
 183                 /* Happily, the 82077 has a real DOR register. */
 184                 sun_fdc->dor_82077 = value;
 185                 break;
 186         case 5: /* FD_DATA */
 187                 sun_fdc->data_82077 = value;
 188                 break;
 189         case 7: /* FD_DCR */
 190                 sun_fdc->dcr_82077 = value;
 191                 break;
 192         case 4: /* FD_STATUS */
 193                 sun_fdc->status_82077 = value;
 194                 break;
 195         };
 196         return;
 197 }
 198 
 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
 208  */
 209 char *pdma_vaddr;
 210 unsigned long pdma_size;
 211 volatile int doing_pdma = 0;
 212 
 213 /* This is software state */
 214 char *pdma_base = 0;
 215 unsigned long pdma_areasize;
 216 
 217 /* Common routines to all controller types on the Sparc. */
 218 static inline void virtual_dma_init(void)
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 219 {
 220         /* nothing... */
 221 }
 222 
 223 static inline void sun_fd_disable_dma(void)
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 224 {
 225         doing_pdma = 0;
 226         if (pdma_base) {
 227                 mmu_unlockarea(pdma_base, pdma_areasize);
 228                 pdma_base = 0;
 229         }
 230 }
 231 
 232 static inline void sun_fd_set_dma_mode(int mode)
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 233 {
 234         switch(mode) {
 235         case DMA_MODE_READ:
 236                 doing_pdma = 1;
 237                 break;
 238         case DMA_MODE_WRITE:
 239                 doing_pdma = 2;
 240                 break;
 241         default:
 242                 printk("Unknown dma mode %d\n", mode);
 243                 panic("floppy: Giving up...");
 244         }
 245 }
 246 
 247 static inline void sun_fd_set_dma_addr(char *buffer)
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 248 {
 249         pdma_vaddr = buffer;
 250 }
 251 
 252 static inline void sun_fd_set_dma_count(int length)
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 253 {
 254         pdma_size = length;
 255 }
 256 
 257 static inline void sun_fd_enable_dma(void)
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 258 {
 259         pdma_vaddr = mmu_lockarea(pdma_vaddr, pdma_size);
 260         pdma_base = pdma_vaddr;
 261         pdma_areasize = pdma_size;
 262 }
 263 
 264 static int sun_fd_eject(void)
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 265 {
 266         set_auxio(AUXIO_FLPY_DSEL, AUXIO_FLPY_EJCT);
 267         udelay(1000);
 268         set_auxio(AUXIO_FLPY_EJCT, AUXIO_FLPY_DSEL);
 269         return 0;
 270 }
 271 
 272 /* Our low-level entry point in arch/sparc/kernel/entry.S */
 273 extern void floppy_hardint(int irq, void *unused, struct pt_regs *regs);
 274 
 275 static int sun_fd_request_irq(void)
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 276 {
 277         static int once = 0;
 278         int error;
 279 
 280         if(!once) {
 281                 once = 1;
 282                 error = request_fast_irq(FLOPPY_IRQ, floppy_hardint, SA_INTERRUPT, "floppy");
 283                 return ((error == 0) ? 0 : -1);
 284         } else return 0;
 285 }
 286 
 287 static struct linux_prom_registers fd_regs[2];
 288 
 289 static int sun_floppy_init(void)
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 290 {
 291         char state[128];
 292         int tnode, fd_node, num_regs;
 293 
 294         FLOPPY_IRQ = 11;
 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 != sun4c && sparc_cpu_model != sun4m) ||
 299            ((idprom->id_machtype == (SM_SUN4C | SM_4C_SLC)) ||
 300             (idprom->id_machtype == (SM_SUN4C | SM_4C_ELC)))) {
 301                 /* We certainly don't have a floppy controller. */
 302                 goto no_sun_fdc;
 303         }
 304         /* Well, try and find one. */
 305         tnode = prom_getchild(prom_root_node);
 306         fd_node = prom_searchsiblings(tnode, "obio");
 307         if(fd_node != 0) {
 308                 tnode = prom_getchild(fd_node);
 309                 fd_node = prom_searchsiblings(tnode, "SUNW,fdtwo");
 310         } else {
 311                 fd_node = prom_searchsiblings(tnode, "fd");
 312         }
 313         if(fd_node == 0) {
 314                 goto no_sun_fdc;
 315         }
 316 
 317         /* The sun4m lets us know if the controller is actually usable. */
 318         if(sparc_cpu_model == sun4m) {
 319                 prom_getproperty(fd_node, "status", state, sizeof(state));
 320                 if(!strcmp(state, "disabled")) {
 321                         goto no_sun_fdc;
 322                 }
 323         }
 324         num_regs = prom_getproperty(fd_node, "reg", (char *) fd_regs, sizeof(fd_regs));
 325         num_regs = (num_regs / sizeof(fd_regs[0]));
 326         prom_apply_obio_ranges(fd_regs, num_regs);
 327         sun_fdc = (struct sun_flpy_controller *) sparc_alloc_io(fd_regs[0].phys_addr,
 328                                                                 0x0,
 329                                                                 fd_regs[0].reg_size,
 330                                                                 "floppy",
 331                                                                 fd_regs[0].which_io,
 332                                                                 0x0);
 333         /* Last minute sanity check... */
 334         if(sun_fdc->status_82072 == 0xff) {
 335                 sun_fdc = NULL;
 336                 goto no_sun_fdc;
 337         }
 338 
 339         /* We need the version as early as possible to set up the
 340          * function pointers correctly.  Assume 82077 for probing
 341          * purposes.
 342          */
 343         sun_fdops.fd_inb = sun_82077_fd_inb;
 344         sun_fdops.fd_outb = sun_82077_fd_outb;
 345         fdc_status = &sun_fdc->status_82077;
 346 
 347         /* This controller detection technique is from the netbsd
 348          * Sun floppy driver, originally Chris Torek of BSDI came
 349          * up with this.  It seems to work pretty well.
 350          */
 351         if(sun_fdc->dor_82077 == 0x80) {
 352                 sun_fdc->dor_82077 = 2;
 353                 if(sun_fdc->dor_82077 == 0x80) {
 354                         /* Ok, it's really an 82072. */
 355                         sun_fdops.fd_inb = sun_82072_fd_inb;
 356                         sun_fdops.fd_outb = sun_82072_fd_outb;
 357                         fdc_status = &sun_fdc->status_82072;
 358                 }
 359         }
 360 
 361         /* P3: The only reliable way which I found for ejection
 362          * of boot floppy. AUXIO_FLPY_EJCT is not enough alone.
 363          */
 364         set_auxio(AUXIO_FLPY_EJCT, 0); /* Bring EJECT line to normal. */
 365         udelay(1000);
 366         sun_fd_eject(0);                /* Send Eject Pulse. */
 367 
 368         /* Success... */
 369         return (int) sun_fdc;
 370 
 371 no_sun_fdc:
 372         return -1;
 373 }
 374 
 375 #endif /* !(__ASM_SPARC_FLOPPY_H) */

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