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 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 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 #define FLOPPY_MOTOR_MASK         0x10
  81
  82 /* XXX This isn't really correct. XXX */
  83 #define get_dma_residue(x)        (0)
  84
  85 #define FLOPPY0_TYPE  4
  86 #define FLOPPY1_TYPE  0
  87
  88 /* Super paranoid... */
  89 #undef HAVE_DISABLE_HLT
  90
  91 /* Here is where we catch the floppy driver trying to initialize,
  92  * therefore this is where we call the PROM device tree probing
  93  * routine etc. on the Sparc.
  94  */
  95 #define FDC1                      sun_floppy_init()
  96
  97 #define N_FDC    1
  98 #define N_DRIVE  8
  99
 100 /* No 64k boundary crossing problems on the Sparc. */
 101 #define CROSS_64KB(a,s) (0)
 102
 103 /* Routines unique to each controller type on a Sun. */
 104 static unsigned char sun_82072_fd_inb(int port)
 105 {
 106         udelay(5);
 107         switch(port & 7) {
 108         default:
 109                 printk("floppy: Asked to read unknown port %d\n", port);
 110                 panic("floppy: Port bolixed.");
 111         case 4: /* FD_STATUS */
 112                 return sun_fdc->status_82072 & ~STATUS_DMA;
 113         case 5: /* FD_DATA */
 114                 return sun_fdc->data_82072;
 115         case 7: /* FD_DIR */
 116                 return (get_auxio() & AUXIO_FLPY_DCHG)? 0x80: 0;
 117         };
 118         panic("sun_82072_fd_inb: How did I get here?");
 119 }
 120
 121 static void sun_82072_fd_outb(unsigned char value, int port)
 122 {
 123         udelay(5);
 124         switch(port & 7) {
 125         default:
 126                 printk("floppy: Asked to write to unknown port %d\n", port);
 127                 panic("floppy: Port bolixed.");
 128         case 2: /* FD_DOR */
 129                 /* Oh geese, 82072 on the Sun has no DOR register,
 130                  * the functionality is implemented via the AUXIO
 131                  * I/O register.  So we must emulate the behavior.
 132                  *
 133                  * ASSUMPTIONS:  There will only ever be one floppy
 134                  *               drive attached to a Sun controller
 135                  *               and it will be at drive zero.
 136                  */
 137                 {
 138                         unsigned bits = 0;
 139                         if (value & 0x10) bits |= AUXIO_FLPY_DSEL;
 140                         if ((value & 0x80) == 0) bits |= AUXIO_FLPY_EJCT;
 141                         set_auxio(bits, (~bits) & (AUXIO_FLPY_DSEL|AUXIO_FLPY_EJCT));
 142                 }
 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)
 158 {
 159         udelay(5);
 160         switch(port & 7) {
 161         default:
 162                 printk("floppy: Asked to read unknown port %d\n", port);
 163                 panic("floppy: Port bolixed.");
 164         case 4: /* FD_STATUS */
 165                 return sun_fdc->status_82077 & ~STATUS_DMA;
 166         case 5: /* FD_DATA */
 167                 return sun_fdc->data_82077;
 168         case 7: /* FD_DIR */
 169                 /* XXX: Is DCL on 0x80 in sun4m? */
 170                 return sun_fdc->dir_82077;
 171         };
 172         panic("sun_82072_fd_inb: How did I get here?");
 173 }
 174
 175 static void sun_82077_fd_outb(unsigned char value, int port)
 176 {
 177         udelay(5);
 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 = NULL;
 215 unsigned long pdma_areasize;
 216
 217 /* Common routines to all controller types on the Sparc. */
 218 static __inline__ void virtual_dma_init(void)
 219 {
 220         /* nothing... */
 221 }
 222
 223 static __inline__ void sun_fd_disable_dma(void)
 224 {
 225         doing_pdma = 0;
 226         if (pdma_base) {
 227                 mmu_unlockarea(pdma_base, pdma_areasize);
 228                 pdma_base = NULL;
 229         }
 230 }
 231
 232 static __inline__ void sun_fd_set_dma_mode(int mode)
 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)
 248 {
 249         pdma_vaddr = buffer;
 250 }
 251
 252 static __inline__ void sun_fd_set_dma_count(int length)
 253 {
 254         pdma_size = length;
 255 }
 256
 257 static __inline__ void sun_fd_enable_dma(void)
 258 {
 259         pdma_vaddr = mmu_lockarea(pdma_vaddr, pdma_size);
 260         pdma_base = pdma_vaddr;
 261         pdma_areasize = pdma_size;
 262 }
 263
 264 /* Our low-level entry point in arch/sparc/kernel/entry.S */
 265 irqreturn_t floppy_hardint(int irq, void *unused, struct pt_regs *regs);
 266
 267 static int sun_fd_request_irq(void)
 268 {
 269         static int once = 0;
 270         int error;
 271
 272         if(!once) {
 273                 once = 1;
 274                 error = request_fast_irq(FLOPPY_IRQ, floppy_hardint, SA_INTERRUPT, "floppy");
 275                 return ((error == 0) ? 0 : -1);
 276         } else return 0;
 277 }
 278
 279 static struct linux_prom_registers fd_regs[2];
 280
 281 static int sun_floppy_init(void)
 282 {
 283         char state[128];
 284         int tnode, fd_node, num_regs;
 285         struct resource r;
 286
 287         use_virtual_dma = 1;
 288
 289         FLOPPY_IRQ = 11;
 290         /* Forget it if we aren't on a machine that could possibly
 291          * ever have a floppy drive.
 292          */
 293         if((sparc_cpu_model != sun4c && sparc_cpu_model != sun4m) ||
 294            ((idprom->id_machtype == (SM_SUN4C | SM_4C_SLC)) ||
 295             (idprom->id_machtype == (SM_SUN4C | SM_4C_ELC)))) {
 296                 /* We certainly don't have a floppy controller. */
 297                 goto no_sun_fdc;
 298         }
 299         /* Well, try to find one. */
 300         tnode = prom_getchild(prom_root_node);
 301         fd_node = prom_searchsiblings(tnode, "obio");
 302         if(fd_node != 0) {
 303                 tnode = prom_getchild(fd_node);
 304                 fd_node = prom_searchsiblings(tnode, "SUNW,fdtwo");
 305         } else {
 306                 fd_node = prom_searchsiblings(tnode, "fd");
 307         }
 308         if(fd_node == 0) {
 309                 goto no_sun_fdc;
 310         }
 311
 312         /* The sun4m lets us know if the controller is actually usable. */
 313         if(sparc_cpu_model == sun4m &&
 314            prom_getproperty(fd_node, "status", state, sizeof(state)) != -1) {
 315                 if(!strcmp(state, "disabled")) {
 316                         goto no_sun_fdc;
 317                 }
 318         }
 319         num_regs = prom_getproperty(fd_node, "reg", (char *) fd_regs, sizeof(fd_regs));
 320         num_regs = (num_regs / sizeof(fd_regs[0]));
 321         prom_apply_obio_ranges(fd_regs, num_regs);
 322         memset(&r, 0, sizeof(r));
 323         r.flags = fd_regs[0].which_io;
 324         r.start = fd_regs[0].phys_addr;
 325         sun_fdc = (struct sun_flpy_controller *)
 326             sbus_ioremap(&r, 0, fd_regs[0].reg_size, "floppy");
 327
 328         /* Last minute sanity check... */
 329         if(sun_fdc->status_82072 == 0xff) {
 330                 sun_fdc = NULL;
 331                 goto no_sun_fdc;
 332         }
 333
 334         if(sparc_cpu_model == sun4c) {
 335                 sun_fdops.fd_inb = sun_82072_fd_inb;
 336                 sun_fdops.fd_outb = sun_82072_fd_outb;
 337                 fdc_status = &sun_fdc->status_82072;
 338                 /* printk("AUXIO @0x%lx\n", auxio_register); */ /* P3 */
 339         } else {
 340                 sun_fdops.fd_inb = sun_82077_fd_inb;
 341                 sun_fdops.fd_outb = sun_82077_fd_outb;
 342                 fdc_status = &sun_fdc->status_82077;
 343                 /* printk("DOR @0x%p\n", &sun_fdc->dor_82077); */ /* P3 */
 344         }
 345
 346         /* Success... */
 347         allowed_drive_mask = 0x01;
 348         return (int) sun_fdc;
 349
 350 no_sun_fdc:
 351         return -1;
 352 }
 353
 354 static int sparc_eject(void)
 355 {
 356         set_dor(0x00, 0xff, 0x90);
 357         udelay(500);
 358         set_dor(0x00, 0x6f, 0x00);
 359         udelay(500);
 360         return 0;
 361 }
 362
 363 #define fd_eject(drive) sparc_eject()
 364
 365 #define EXTRA_FLOPPY_PARAMS
 366
 367 #endif /* !(__ASM_SPARC_FLOPPY_H) */