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@davemloft.net)
   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 request_region
  21 #define release_region(X, Y)    do { } while(0)
  22 #define request_region(X, Y, Z) (1)
  23
  24 /* References:
  25  * 1) Netbsd Sun floppy driver.
  26  * 2) NCR 82077 controller manual
  27  * 3) Intel 82077 controller manual
  28  */
  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 */
  33
  34         volatile unsigned char data_82072;    /* Data fifo. */
  35 #define status2_82077          data_82072     /* Auxiliary Status reg. 2 */
  36
  37         volatile unsigned char dor_82077;     /* Digital Output reg. */
  38         volatile unsigned char tapectl_82077; /* What the? Tape control reg? */
  39
  40         volatile unsigned char status_82077;  /* Main Status Register. */
  41 #define drs_82077              status_82077   /* Digital Rate Select reg. */
  42
  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. */
  47 };
  48
  49 /* You'll only ever find one controller on a SparcStation anyways. */
  50 static struct sun_flpy_controller *sun_fdc = NULL;
  51 extern volatile unsigned char *fdc_status;
  52
  53 struct sun_floppy_ops {
  54         unsigned char (*fd_inb)(int port);
  55         void (*fd_outb)(unsigned char value, int port);
  56 };
  57
  58 static struct sun_floppy_ops sun_fdops;
  59
  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)))
  78 #endif
  79
  80 /* XXX This isn't really correct. XXX */
  81 #define get_dma_residue(x)        (0)
  82
  83 #define FLOPPY0_TYPE  4
  84 #define FLOPPY1_TYPE  0
  85
  86 /* Super paranoid... */
  87 #undef HAVE_DISABLE_HLT
  88
  89 /* Here is where we catch the floppy driver trying to initialize,
  90  * therefore this is where we call the PROM device tree probing
  91  * routine etc. on the Sparc.
  92  */
  93 #define FDC1                      sun_floppy_init()
  94
  95 #define N_FDC    1
  96 #define N_DRIVE  8
  97
  98 /* No 64k boundary crossing problems on the Sparc. */
  99 #define CROSS_64KB(a,s) (0)
 100
 101 /* Routines unique to each controller type on a Sun. */
 102 static void sun_set_dor(unsigned char value, int fdc_82077)
 103 {
 104         if (sparc_cpu_model == sun4c) {
 105                 unsigned int bits = 0;
 106                 if (value & 0x10)
 107                         bits |= AUXIO_FLPY_DSEL;
 108                 if ((value & 0x80) == 0)
 109                         bits |= AUXIO_FLPY_EJCT;
 110                 set_auxio(bits, (~bits) & (AUXIO_FLPY_DSEL|AUXIO_FLPY_EJCT));
 111         }
 112         if (fdc_82077) {
 113                 sun_fdc->dor_82077 = value;
 114         }
 115 }
 116
 117 static unsigned char sun_read_dir(void)
 118 {
 119         if (sparc_cpu_model == sun4c)
 120                 return (get_auxio() & AUXIO_FLPY_DCHG) ? 0x80 : 0;
 121         else
 122                 return sun_fdc->dir_82077;
 123 }
 124
 125 static unsigned char sun_82072_fd_inb(int port)
 126 {
 127         udelay(5);
 128         switch(port & 7) {
 129         default:
 130                 printk("floppy: Asked to read unknown port %d\n", port);
 131                 panic("floppy: Port bolixed.");
 132         case 4: /* FD_STATUS */
 133                 return sun_fdc->status_82072 & ~STATUS_DMA;
 134         case 5: /* FD_DATA */
 135                 return sun_fdc->data_82072;
 136         case 7: /* FD_DIR */
 137                 return sun_read_dir();
 138         };
 139         panic("sun_82072_fd_inb: How did I get here?");
 140 }
 141
 142 static void sun_82072_fd_outb(unsigned char value, int port)
 143 {
 144         udelay(5);
 145         switch(port & 7) {
 146         default:
 147                 printk("floppy: Asked to write to unknown port %d\n", port);
 148                 panic("floppy: Port bolixed.");
 149         case 2: /* FD_DOR */
 150                 sun_set_dor(value, 0);
 151                 break;
 152         case 5: /* FD_DATA */
 153                 sun_fdc->data_82072 = value;
 154                 break;
 155         case 7: /* FD_DCR */
 156                 sun_fdc->dcr_82072 = value;
 157                 break;
 158         case 4: /* FD_STATUS */
 159                 sun_fdc->status_82072 = value;
 160                 break;
 161         };
 162         return;
 163 }
 164
 165 static unsigned char sun_82077_fd_inb(int port)
 166 {
 167         udelay(5);
 168         switch(port & 7) {
 169         default:
 170                 printk("floppy: Asked to read unknown port %d\n", port);
 171                 panic("floppy: Port bolixed.");
 172         case 0: /* FD_STATUS_0 */
 173                 return sun_fdc->status1_82077;
 174         case 1: /* FD_STATUS_1 */
 175                 return sun_fdc->status2_82077;
 176         case 2: /* FD_DOR */
 177                 return sun_fdc->dor_82077;
 178         case 3: /* FD_TDR */
 179                 return sun_fdc->tapectl_82077;
 180         case 4: /* FD_STATUS */
 181                 return sun_fdc->status_82077 & ~STATUS_DMA;
 182         case 5: /* FD_DATA */
 183                 return sun_fdc->data_82077;
 184         case 7: /* FD_DIR */
 185                 return sun_read_dir();
 186         };
 187         panic("sun_82077_fd_inb: How did I get here?");
 188 }
 189
 190 static void sun_82077_fd_outb(unsigned char value, int port)
 191 {
 192         udelay(5);
 193         switch(port & 7) {
 194         default:
 195                 printk("floppy: Asked to write to unknown port %d\n", port);
 196                 panic("floppy: Port bolixed.");
 197         case 2: /* FD_DOR */
 198                 sun_set_dor(value, 1);
 199                 break;
 200         case 5: /* FD_DATA */
 201                 sun_fdc->data_82077 = value;
 202                 break;
 203         case 7: /* FD_DCR */
 204                 sun_fdc->dcr_82077 = value;
 205                 break;
 206         case 4: /* FD_STATUS */
 207                 sun_fdc->status_82077 = value;
 208                 break;
 209         case 3: /* FD_TDR */
 210                 sun_fdc->tapectl_82077 = value;
 211                 break;
 212         };
 213         return;
 214 }
 215
 216 /* For pseudo-dma (Sun floppy drives have no real DMA available to
 217  * them so we must eat the data fifo bytes directly ourselves) we have
 218  * three state variables.  doing_pdma tells our inline low-level
 219  * assembly floppy interrupt entry point whether it should sit and eat
 220  * bytes from the fifo or just transfer control up to the higher level
 221  * floppy interrupt c-code.  I tried very hard but I could not get the
 222  * pseudo-dma to work in c-code without getting many overruns and
 223  * underruns.  If non-zero, doing_pdma encodes the direction of
 224  * the transfer for debugging.  1=read 2=write
 225  */
 226 extern char *pdma_vaddr;
 227 extern unsigned long pdma_size;
 228 extern volatile int doing_pdma;
 229
 230 /* This is software state */
 231 extern char *pdma_base;
 232 extern unsigned long pdma_areasize;
 233
 234 /* Common routines to all controller types on the Sparc. */
 235 static inline void virtual_dma_init(void)
 236 {
 237         /* nothing... */
 238 }
 239
 240 static inline void sun_fd_disable_dma(void)
 241 {
 242         doing_pdma = 0;
 243         if (pdma_base) {
 244                 mmu_unlockarea(pdma_base, pdma_areasize);
 245                 pdma_base = NULL;
 246         }
 247 }
 248
 249 static inline void sun_fd_set_dma_mode(int mode)
 250 {
 251         switch(mode) {
 252         case DMA_MODE_READ:
 253                 doing_pdma = 1;
 254                 break;
 255         case DMA_MODE_WRITE:
 256                 doing_pdma = 2;
 257                 break;
 258         default:
 259                 printk("Unknown dma mode %d\n", mode);
 260                 panic("floppy: Giving up...");
 261         }
 262 }
 263
 264 static inline void sun_fd_set_dma_addr(char *buffer)
 265 {
 266         pdma_vaddr = buffer;
 267 }
 268
 269 static inline void sun_fd_set_dma_count(int length)
 270 {
 271         pdma_size = length;
 272 }
 273
 274 static inline void sun_fd_enable_dma(void)
 275 {
 276         pdma_vaddr = mmu_lockarea(pdma_vaddr, pdma_size);
 277         pdma_base = pdma_vaddr;
 278         pdma_areasize = pdma_size;
 279 }
 280
 281 /* Our low-level entry point in arch/sparc/kernel/entry.S */
 282 extern int sparc_floppy_request_irq(int irq, unsigned long flags,
 283                                     irqreturn_t (*irq_handler)(int irq, void *));
 284
 285 static int sun_fd_request_irq(void)
 286 {
 287         static int once = 0;
 288         int error;
 289
 290         if(!once) {
 291                 once = 1;
 292                 error = sparc_floppy_request_irq(FLOPPY_IRQ,
 293                                                  IRQF_DISABLED,
 294                                                  floppy_interrupt);
 295                 return ((error == 0) ? 0 : -1);
 296         } else return 0;
 297 }
 298
 299 static struct linux_prom_registers fd_regs[2];
 300
 301 static int sun_floppy_init(void)
 302 {
 303         char state[128];
 304         int tnode, fd_node, num_regs;
 305         struct resource r;
 306
 307         use_virtual_dma = 1;
 308
 309         FLOPPY_IRQ = 11;
 310         /* Forget it if we aren't on a machine that could possibly
 311          * ever have a floppy drive.
 312          */
 313         if((sparc_cpu_model != sun4c && sparc_cpu_model != sun4m) ||
 314            ((idprom->id_machtype == (SM_SUN4C | SM_4C_SLC)) ||
 315             (idprom->id_machtype == (SM_SUN4C | SM_4C_ELC)))) {
 316                 /* We certainly don't have a floppy controller. */
 317                 goto no_sun_fdc;
 318         }
 319         /* Well, try to find one. */
 320         tnode = prom_getchild(prom_root_node);
 321         fd_node = prom_searchsiblings(tnode, "obio");
 322         if(fd_node != 0) {
 323                 tnode = prom_getchild(fd_node);
 324                 fd_node = prom_searchsiblings(tnode, "SUNW,fdtwo");
 325         } else {
 326                 fd_node = prom_searchsiblings(tnode, "fd");
 327         }
 328         if(fd_node == 0) {
 329                 goto no_sun_fdc;
 330         }
 331
 332         /* The sun4m lets us know if the controller is actually usable. */
 333         if(sparc_cpu_model == sun4m &&
 334            prom_getproperty(fd_node, "status", state, sizeof(state)) != -1) {
 335                 if(!strcmp(state, "disabled")) {
 336                         goto no_sun_fdc;
 337                 }
 338         }
 339         num_regs = prom_getproperty(fd_node, "reg", (char *) fd_regs, sizeof(fd_regs));
 340         num_regs = (num_regs / sizeof(fd_regs[0]));
 341         prom_apply_obio_ranges(fd_regs, num_regs);
 342         memset(&r, 0, sizeof(r));
 343         r.flags = fd_regs[0].which_io;
 344         r.start = fd_regs[0].phys_addr;
 345         sun_fdc = (struct sun_flpy_controller *)
 346             sbus_ioremap(&r, 0, fd_regs[0].reg_size, "floppy");
 347
 348         /* Last minute sanity check... */
 349         if(sun_fdc->status_82072 == 0xff) {
 350                 sun_fdc = NULL;
 351                 goto no_sun_fdc;
 352         }
 353
 354         sun_fdops.fd_inb = sun_82077_fd_inb;
 355         sun_fdops.fd_outb = sun_82077_fd_outb;
 356         fdc_status = &sun_fdc->status_82077;
 357
 358         if (sun_fdc->dor_82077 == 0x80) {
 359                 sun_fdc->dor_82077 = 0x02;
 360                 if (sun_fdc->dor_82077 == 0x80) {
 361                         sun_fdops.fd_inb = sun_82072_fd_inb;
 362                         sun_fdops.fd_outb = sun_82072_fd_outb;
 363                         fdc_status = &sun_fdc->status_82072;
 364                 }
 365         }
 366
 367         /* Success... */
 368         allowed_drive_mask = 0x01;
 369         return (int) sun_fdc;
 370
 371 no_sun_fdc:
 372         return -1;
 373 }
 374
 375 static int sparc_eject(void)
 376 {
 377         set_dor(0x00, 0xff, 0x90);
 378         udelay(500);
 379         set_dor(0x00, 0x6f, 0x00);
 380         udelay(500);
 381         return 0;
 382 }
 383
 384 #define fd_eject(drive) sparc_eject()
 385
 386 #define EXTRA_FLOPPY_PARAMS
 387
 388 #endif /* !(__ASM_SPARC_FLOPPY_H) */