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) */