release/src-rt-6.x.4708/linux/linux-2.6.36/arch/sparc/include/asm/floppy_32.h

   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/system.h>
  15 #include <asm/idprom.h>
  16 #include <asm/machines.h>
  17 #include <asm/oplib.h>
  18 #include <asm/auxio.h>
  19 #include <asm/irq.h>
  20
  21 /* We don't need no stinkin' I/O port allocation crap. */
  22 #undef release_region
  23 #undef request_region
  24 #define release_region(X, Y)    do { } while(0)
  25 #define request_region(X, Y, Z) (1)
  26
  27 /* References:
  28  * 1) Netbsd Sun floppy driver.
  29  * 2) NCR 82077 controller manual
  30  * 3) Intel 82077 controller manual
  31  */
  32 struct sun_flpy_controller {
  33         volatile unsigned char status_82072;  /* Main Status reg. */
  34 #define dcr_82072              status_82072   /* Digital Control reg. */
  35 #define status1_82077          status_82072   /* Auxiliary Status reg. 1 */
  36
  37         volatile unsigned char data_82072;    /* Data fifo. */
  38 #define status2_82077          data_82072     /* Auxiliary Status reg. 2 */
  39
  40         volatile unsigned char dor_82077;     /* Digital Output reg. */
  41         volatile unsigned char tapectl_82077; /* What the? Tape control reg? */
  42
  43         volatile unsigned char status_82077;  /* Main Status Register. */
  44 #define drs_82077              status_82077   /* Digital Rate Select reg. */
  45
  46         volatile unsigned char data_82077;    /* Data fifo. */
  47         volatile unsigned char ___unused;
  48         volatile unsigned char dir_82077;     /* Digital Input reg. */
  49 #define dcr_82077              dir_82077      /* Config Control reg. */
  50 };
  51
  52 /* You'll only ever find one controller on a SparcStation anyways. */
  53 static struct sun_flpy_controller *sun_fdc = NULL;
  54 extern volatile unsigned char *fdc_status;
  55
  56 struct sun_floppy_ops {
  57         unsigned char (*fd_inb)(int port);
  58         void (*fd_outb)(unsigned char value, int port);
  59 };
  60
  61 static struct sun_floppy_ops sun_fdops;
  62
  63 #define fd_inb(port)              sun_fdops.fd_inb(port)
  64 #define fd_outb(value,port)       sun_fdops.fd_outb(value,port)
  65 #define fd_enable_dma()           sun_fd_enable_dma()
  66 #define fd_disable_dma()          sun_fd_disable_dma()
  67 #define fd_request_dma()          (0) /* nothing... */
  68 #define fd_free_dma()             /* nothing... */
  69 #define fd_clear_dma_ff()         /* nothing... */
  70 #define fd_set_dma_mode(mode)     sun_fd_set_dma_mode(mode)
  71 #define fd_set_dma_addr(addr)     sun_fd_set_dma_addr(addr)
  72 #define fd_set_dma_count(count)   sun_fd_set_dma_count(count)
  73 #define fd_enable_irq()           /* nothing... */
  74 #define fd_disable_irq()          /* nothing... */
  75 #define fd_cacheflush(addr, size) /* nothing... */
  76 #define fd_request_irq()          sun_fd_request_irq()
  77 #define fd_free_irq()             /* nothing... */
  78
  79 #define get_dma_residue(x)        (0)
  80
  81 #define FLOPPY0_TYPE  4
  82 #define FLOPPY1_TYPE  0
  83
  84 /* Super paranoid... */
  85 #undef HAVE_DISABLE_HLT
  86
  87 /* Here is where we catch the floppy driver trying to initialize,
  88  * therefore this is where we call the PROM device tree probing
  89  * routine etc. on the Sparc.
  90  */
  91 #define FDC1                      sun_floppy_init()
  92
  93 #define N_FDC    1
  94 #define N_DRIVE  8
  95
  96 /* No 64k boundary crossing problems on the Sparc. */
  97 #define CROSS_64KB(a,s) (0)
  98
  99 /* Routines unique to each controller type on a Sun. */
 100 static void sun_set_dor(unsigned char value, int fdc_82077)
 101 {
 102         if (sparc_cpu_model == sun4c) {
 103                 unsigned int bits = 0;
 104                 if (value & 0x10)
 105                         bits |= AUXIO_FLPY_DSEL;
 106                 if ((value & 0x80) == 0)
 107                         bits |= AUXIO_FLPY_EJCT;
 108                 set_auxio(bits, (~bits) & (AUXIO_FLPY_DSEL|AUXIO_FLPY_EJCT));
 109         }
 110         if (fdc_82077) {
 111                 sun_fdc->dor_82077 = value;
 112         }
 113 }
 114
 115 static unsigned char sun_read_dir(void)
 116 {
 117         if (sparc_cpu_model == sun4c)
 118                 return (get_auxio() & AUXIO_FLPY_DCHG) ? 0x80 : 0;
 119         else
 120                 return sun_fdc->dir_82077;
 121 }
 122
 123 static unsigned char sun_82072_fd_inb(int port)
 124 {
 125         udelay(5);
 126         switch(port & 7) {
 127         default:
 128                 printk("floppy: Asked to read unknown port %d\n", port);
 129                 panic("floppy: Port bolixed.");
 130         case 4: /* FD_STATUS */
 131                 return sun_fdc->status_82072 & ~STATUS_DMA;
 132         case 5: /* FD_DATA */
 133                 return sun_fdc->data_82072;
 134         case 7: /* FD_DIR */
 135                 return sun_read_dir();
 136         };
 137         panic("sun_82072_fd_inb: How did I get here?");
 138 }
 139
 140 static void sun_82072_fd_outb(unsigned char value, int port)
 141 {
 142         udelay(5);
 143         switch(port & 7) {
 144         default:
 145                 printk("floppy: Asked to write to unknown port %d\n", port);
 146                 panic("floppy: Port bolixed.");
 147         case 2: /* FD_DOR */
 148                 sun_set_dor(value, 0);
 149                 break;
 150         case 5: /* FD_DATA */
 151                 sun_fdc->data_82072 = value;
 152                 break;
 153         case 7: /* FD_DCR */
 154                 sun_fdc->dcr_82072 = value;
 155                 break;
 156         case 4: /* FD_STATUS */
 157                 sun_fdc->status_82072 = value;
 158                 break;
 159         };
 160         return;
 161 }
 162
 163 static unsigned char sun_82077_fd_inb(int port)
 164 {
 165         udelay(5);
 166         switch(port & 7) {
 167         default:
 168                 printk("floppy: Asked to read unknown port %d\n", port);
 169                 panic("floppy: Port bolixed.");
 170         case 0: /* FD_STATUS_0 */
 171                 return sun_fdc->status1_82077;
 172         case 1: /* FD_STATUS_1 */
 173                 return sun_fdc->status2_82077;
 174         case 2: /* FD_DOR */
 175                 return sun_fdc->dor_82077;
 176         case 3: /* FD_TDR */
 177                 return sun_fdc->tapectl_82077;
 178         case 4: /* FD_STATUS */
 179                 return sun_fdc->status_82077 & ~STATUS_DMA;
 180         case 5: /* FD_DATA */
 181                 return sun_fdc->data_82077;
 182         case 7: /* FD_DIR */
 183                 return sun_read_dir();
 184         };
 185         panic("sun_82077_fd_inb: How did I get here?");
 186 }
 187
 188 static void sun_82077_fd_outb(unsigned char value, int port)
 189 {
 190         udelay(5);
 191         switch(port & 7) {
 192         default:
 193                 printk("floppy: Asked to write to unknown port %d\n", port);
 194                 panic("floppy: Port bolixed.");
 195         case 2: /* FD_DOR */
 196                 sun_set_dor(value, 1);
 197                 break;
 198         case 5: /* FD_DATA */
 199                 sun_fdc->data_82077 = value;
 200                 break;
 201         case 7: /* FD_DCR */
 202                 sun_fdc->dcr_82077 = value;
 203                 break;
 204         case 4: /* FD_STATUS */
 205                 sun_fdc->status_82077 = value;
 206                 break;
 207         case 3: /* FD_TDR */
 208                 sun_fdc->tapectl_82077 = value;
 209                 break;
 210         };
 211         return;
 212 }
 213
 214 /* For pseudo-dma (Sun floppy drives have no real DMA available to
 215  * them so we must eat the data fifo bytes directly ourselves) we have
 216  * three state variables.  doing_pdma tells our inline low-level
 217  * assembly floppy interrupt entry point whether it should sit and eat
 218  * bytes from the fifo or just transfer control up to the higher level
 219  * floppy interrupt c-code.  I tried very hard but I could not get the
 220  * pseudo-dma to work in c-code without getting many overruns and
 221  * underruns.  If non-zero, doing_pdma encodes the direction of
 222  * the transfer for debugging.  1=read 2=write
 223  */
 224 extern char *pdma_vaddr;
 225 extern unsigned long pdma_size;
 226 extern volatile int doing_pdma;
 227
 228 /* This is software state */
 229 extern char *pdma_base;
 230 extern unsigned long pdma_areasize;
 231
 232 /* Common routines to all controller types on the Sparc. */
 233 static inline void virtual_dma_init(void)
 234 {
 235         /* nothing... */
 236 }
 237
 238 static inline void sun_fd_disable_dma(void)
 239 {
 240         doing_pdma = 0;
 241         if (pdma_base) {
 242                 mmu_unlockarea(pdma_base, pdma_areasize);
 243                 pdma_base = NULL;
 244         }
 245 }
 246
 247 static inline void sun_fd_set_dma_mode(int mode)
 248 {
 249         switch(mode) {
 250         case DMA_MODE_READ:
 251                 doing_pdma = 1;
 252                 break;
 253         case DMA_MODE_WRITE:
 254                 doing_pdma = 2;
 255                 break;
 256         default:
 257                 printk("Unknown dma mode %d\n", mode);
 258                 panic("floppy: Giving up...");
 259         }
 260 }
 261
 262 static inline void sun_fd_set_dma_addr(char *buffer)
 263 {
 264         pdma_vaddr = buffer;
 265 }
 266
 267 static inline void sun_fd_set_dma_count(int length)
 268 {
 269         pdma_size = length;
 270 }
 271
 272 static inline void sun_fd_enable_dma(void)
 273 {
 274         pdma_vaddr = mmu_lockarea(pdma_vaddr, pdma_size);
 275         pdma_base = pdma_vaddr;
 276         pdma_areasize = pdma_size;
 277 }
 278
 279 /* Our low-level entry point in arch/sparc/kernel/entry.S */
 280 extern int sparc_floppy_request_irq(int irq, unsigned long flags,
 281                                     irq_handler_t irq_handler);
 282
 283 static int sun_fd_request_irq(void)
 284 {
 285         static int once = 0;
 286         int error;
 287
 288         if(!once) {
 289                 once = 1;
 290                 error = sparc_floppy_request_irq(FLOPPY_IRQ,
 291                                                  IRQF_DISABLED,
 292                                                  floppy_interrupt);
 293                 return ((error == 0) ? 0 : -1);
 294         } else return 0;
 295 }
 296
 297 static struct linux_prom_registers fd_regs[2];
 298
 299 static int sun_floppy_init(void)
 300 {
 301         char state[128];
 302         int tnode, fd_node, num_regs;
 303         struct resource r;
 304
 305         use_virtual_dma = 1;
 306
 307         FLOPPY_IRQ = 11;
 308         /* Forget it if we aren't on a machine that could possibly
 309          * ever have a floppy drive.
 310          */
 311         if((sparc_cpu_model != sun4c && sparc_cpu_model != sun4m) ||
 312            ((idprom->id_machtype == (SM_SUN4C | SM_4C_SLC)) ||
 313             (idprom->id_machtype == (SM_SUN4C | SM_4C_ELC)))) {
 314                 /* We certainly don't have a floppy controller. */
 315                 goto no_sun_fdc;
 316         }
 317         /* Well, try to find one. */
 318         tnode = prom_getchild(prom_root_node);
 319         fd_node = prom_searchsiblings(tnode, "obio");
 320         if(fd_node != 0) {
 321                 tnode = prom_getchild(fd_node);
 322                 fd_node = prom_searchsiblings(tnode, "SUNW,fdtwo");
 323         } else {
 324                 fd_node = prom_searchsiblings(tnode, "fd");
 325         }
 326         if(fd_node == 0) {
 327                 goto no_sun_fdc;
 328         }
 329
 330         /* The sun4m lets us know if the controller is actually usable. */
 331         if(sparc_cpu_model == sun4m &&
 332            prom_getproperty(fd_node, "status", state, sizeof(state)) != -1) {
 333                 if(!strcmp(state, "disabled")) {
 334                         goto no_sun_fdc;
 335                 }
 336         }
 337         num_regs = prom_getproperty(fd_node, "reg", (char *) fd_regs, sizeof(fd_regs));
 338         num_regs = (num_regs / sizeof(fd_regs[0]));
 339         prom_apply_obio_ranges(fd_regs, num_regs);
 340         memset(&r, 0, sizeof(r));
 341         r.flags = fd_regs[0].which_io;
 342         r.start = fd_regs[0].phys_addr;
 343         sun_fdc = (struct sun_flpy_controller *)
 344             of_ioremap(&r, 0, fd_regs[0].reg_size, "floppy");
 345
 346         /* Last minute sanity check... */
 347         if(sun_fdc->status_82072 == 0xff) {
 348                 sun_fdc = NULL;
 349                 goto no_sun_fdc;
 350         }
 351
 352         sun_fdops.fd_inb = sun_82077_fd_inb;
 353         sun_fdops.fd_outb = sun_82077_fd_outb;
 354         fdc_status = &sun_fdc->status_82077;
 355
 356         if (sun_fdc->dor_82077 == 0x80) {
 357                 sun_fdc->dor_82077 = 0x02;
 358                 if (sun_fdc->dor_82077 == 0x80) {
 359                         sun_fdops.fd_inb = sun_82072_fd_inb;
 360                         sun_fdops.fd_outb = sun_82072_fd_outb;
 361                         fdc_status = &sun_fdc->status_82072;
 362                 }
 363         }
 364
 365         /* Success... */
 366         allowed_drive_mask = 0x01;
 367         return (int) sun_fdc;
 368
 369 no_sun_fdc:
 370         return -1;
 371 }
 372
 373 static int sparc_eject(void)
 374 {
 375         set_dor(0x00, 0xff, 0x90);
 376         udelay(500);
 377         set_dor(0x00, 0x6f, 0x00);
 378         udelay(500);
 379         return 0;
 380 }
 381
 382 #define fd_eject(drive) sparc_eject()
 383
 384 #define EXTRA_FLOPPY_PARAMS
 385
 386 static DEFINE_SPINLOCK(dma_spin_lock);
 387
 388 #define claim_dma_lock() \
 389 ({      unsigned long flags; \
 390         spin_lock_irqsave(&dma_spin_lock, flags); \
 391         flags; \
 392 })
 393
 394 #define release_dma_lock(__flags) \
 395         spin_unlock_irqrestore(&dma_spin_lock, __flags);
 396
 397 #endif /* !(__ASM_SPARC_FLOPPY_H) */