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/idprom.h>
  15 #include <asm/oplib.h>
  16 #include <asm/auxio.h>
  17 #include <asm/irq.h>
  18
  19 /* We don't need no stinkin' I/O port allocation crap. */
  20 #undef release_region
  21 #undef request_region
  22 #define release_region(X, Y)    do { } while(0)
  23 #define request_region(X, Y, Z) (1)
  24
  25 /* References:
  26  * 1) Netbsd Sun floppy driver.
  27  * 2) NCR 82077 controller manual
  28  * 3) Intel 82077 controller manual
  29  */
  30 struct sun_flpy_controller {
  31         volatile unsigned char status_82072;  /* Main Status reg. */
  32 #define dcr_82072              status_82072   /* Digital Control reg. */
  33 #define status1_82077          status_82072   /* Auxiliary Status reg. 1 */
  34
  35         volatile unsigned char data_82072;    /* Data fifo. */
  36 #define status2_82077          data_82072     /* Auxiliary Status reg. 2 */
  37
  38         volatile unsigned char dor_82077;     /* Digital Output reg. */
  39         volatile unsigned char tapectl_82077; /* What the? Tape control reg? */
  40
  41         volatile unsigned char status_82077;  /* Main Status Register. */
  42 #define drs_82077              status_82077   /* Digital Rate Select reg. */
  43
  44         volatile unsigned char data_82077;    /* Data fifo. */
  45         volatile unsigned char ___unused;
  46         volatile unsigned char dir_82077;     /* Digital Input reg. */
  47 #define dcr_82077              dir_82077      /* Config Control reg. */
  48 };
  49
  50 /* You'll only ever find one controller on a SparcStation anyways. */
  51 static struct sun_flpy_controller *sun_fdc = NULL;
  52 extern volatile unsigned char *fdc_status;
  53
  54 struct sun_floppy_ops {
  55         unsigned char (*fd_inb)(int port);
  56         void (*fd_outb)(unsigned char value, int port);
  57 };
  58
  59 static struct sun_floppy_ops sun_fdops;
  60
  61 #define fd_inb(port)              sun_fdops.fd_inb(port)
  62 #define fd_outb(value,port)       sun_fdops.fd_outb(value,port)
  63 #define fd_enable_dma()           sun_fd_enable_dma()
  64 #define fd_disable_dma()          sun_fd_disable_dma()
  65 #define fd_request_dma()          (0) /* nothing... */
  66 #define fd_free_dma()             /* nothing... */
  67 #define fd_clear_dma_ff()         /* nothing... */
  68 #define fd_set_dma_mode(mode)     sun_fd_set_dma_mode(mode)
  69 #define fd_set_dma_addr(addr)     sun_fd_set_dma_addr(addr)
  70 #define fd_set_dma_count(count)   sun_fd_set_dma_count(count)
  71 #define fd_enable_irq()           /* nothing... */
  72 #define fd_disable_irq()          /* nothing... */
  73 #define fd_cacheflush(addr, size) /* nothing... */
  74 #define fd_request_irq()          sun_fd_request_irq()
  75 #define fd_free_irq()             /* nothing... */
  76 #if 0  /* P3: added by Alain, these cause a MMU corruption. 19960524 XXX */
  77 #define fd_dma_mem_alloc(size)    ((unsigned long) vmalloc(size))
  78 #define fd_dma_mem_free(addr,size) (vfree((void *)(addr)))
  79 #endif
  80
  81 /* XXX This isn't really correct. XXX */
  82 #define get_dma_residue(x)        (0)
  83
  84 #define FLOPPY0_TYPE  4
  85 #define FLOPPY1_TYPE  0
  86
  87 /* Super paranoid... */
  88 #undef HAVE_DISABLE_HLT
  89
  90 /* Here is where we catch the floppy driver trying to initialize,
  91  * therefore this is where we call the PROM device tree probing
  92  * routine etc. on the Sparc.
  93  */
  94 #define FDC1                      sun_floppy_init()
  95
  96 #define N_FDC    1
  97 #define N_DRIVE  8
  98
  99 /* No 64k boundary crossing problems on the Sparc. */
 100 #define CROSS_64KB(a,s) (0)
 101
 102 /* Routines unique to each controller type on a Sun. */
 103 static void sun_set_dor(unsigned char value, int fdc_82077)
 104 {
 105         if (fdc_82077)
 106                 sun_fdc->dor_82077 = value;
 107 }
 108
 109 static unsigned char sun_read_dir(void)
 110 {
 111         return sun_fdc->dir_82077;
 112 }
 113
 114 static unsigned char sun_82072_fd_inb(int port)
 115 {
 116         udelay(5);
 117         switch(port & 7) {
 118         default:
 119                 printk("floppy: Asked to read unknown port %d\n", port);
 120                 panic("floppy: Port bolixed.");
 121         case 4: /* FD_STATUS */
 122                 return sun_fdc->status_82072 & ~STATUS_DMA;
 123         case 5: /* FD_DATA */
 124                 return sun_fdc->data_82072;
 125         case 7: /* FD_DIR */
 126                 return sun_read_dir();
 127         }
 128         panic("sun_82072_fd_inb: How did I get here?");
 129 }
 130
 131 static void sun_82072_fd_outb(unsigned char value, int port)
 132 {
 133         udelay(5);
 134         switch(port & 7) {
 135         default:
 136                 printk("floppy: Asked to write to unknown port %d\n", port);
 137                 panic("floppy: Port bolixed.");
 138         case 2: /* FD_DOR */
 139                 sun_set_dor(value, 0);
 140                 break;
 141         case 5: /* FD_DATA */
 142                 sun_fdc->data_82072 = value;
 143                 break;
 144         case 7: /* FD_DCR */
 145                 sun_fdc->dcr_82072 = value;
 146                 break;
 147         case 4: /* FD_STATUS */
 148                 sun_fdc->status_82072 = value;
 149                 break;
 150         }
 151         return;
 152 }
 153
 154 static unsigned char sun_82077_fd_inb(int port)
 155 {
 156         udelay(5);
 157         switch(port & 7) {
 158         default:
 159                 printk("floppy: Asked to read unknown port %d\n", port);
 160                 panic("floppy: Port bolixed.");
 161         case 0: /* FD_STATUS_0 */
 162                 return sun_fdc->status1_82077;
 163         case 1: /* FD_STATUS_1 */
 164                 return sun_fdc->status2_82077;
 165         case 2: /* FD_DOR */
 166                 return sun_fdc->dor_82077;
 167         case 3: /* FD_TDR */
 168                 return sun_fdc->tapectl_82077;
 169         case 4: /* FD_STATUS */
 170                 return sun_fdc->status_82077 & ~STATUS_DMA;
 171         case 5: /* FD_DATA */
 172                 return sun_fdc->data_82077;
 173         case 7: /* FD_DIR */
 174                 return sun_read_dir();
 175         }
 176         panic("sun_82077_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                 sun_set_dor(value, 1);
 188                 break;
 189         case 5: /* FD_DATA */
 190                 sun_fdc->data_82077 = value;
 191                 break;
 192         case 7: /* FD_DCR */
 193                 sun_fdc->dcr_82077 = value;
 194                 break;
 195         case 4: /* FD_STATUS */
 196                 sun_fdc->status_82077 = value;
 197                 break;
 198         case 3: /* FD_TDR */
 199                 sun_fdc->tapectl_82077 = value;
 200                 break;
 201         }
 202         return;
 203 }
 204
 205 /* For pseudo-dma (Sun floppy drives have no real DMA available to
 206  * them so we must eat the data fifo bytes directly ourselves) we have
 207  * three state variables.  doing_pdma tells our inline low-level
 208  * assembly floppy interrupt entry point whether it should sit and eat
 209  * bytes from the fifo or just transfer control up to the higher level
 210  * floppy interrupt c-code.  I tried very hard but I could not get the
 211  * pseudo-dma to work in c-code without getting many overruns and
 212  * underruns.  If non-zero, doing_pdma encodes the direction of
 213  * the transfer for debugging.  1=read 2=write
 214  */
 215 extern char *pdma_vaddr;
 216 extern unsigned long pdma_size;
 217 extern volatile int doing_pdma;
 218
 219 /* This is software state */
 220 extern char *pdma_base;
 221 extern unsigned long pdma_areasize;
 222
 223 /* Common routines to all controller types on the Sparc. */
 224 static inline void virtual_dma_init(void)
 225 {
 226         /* nothing... */
 227 }
 228
 229 static inline void sun_fd_disable_dma(void)
 230 {
 231         doing_pdma = 0;
 232         pdma_base = NULL;
 233 }
 234
 235 static inline void sun_fd_set_dma_mode(int mode)
 236 {
 237         switch(mode) {
 238         case DMA_MODE_READ:
 239                 doing_pdma = 1;
 240                 break;
 241         case DMA_MODE_WRITE:
 242                 doing_pdma = 2;
 243                 break;
 244         default:
 245                 printk("Unknown dma mode %d\n", mode);
 246                 panic("floppy: Giving up...");
 247         }
 248 }
 249
 250 static inline void sun_fd_set_dma_addr(char *buffer)
 251 {
 252         pdma_vaddr = buffer;
 253 }
 254
 255 static inline void sun_fd_set_dma_count(int length)
 256 {
 257         pdma_size = length;
 258 }
 259
 260 static inline void sun_fd_enable_dma(void)
 261 {
 262         pdma_base = pdma_vaddr;
 263         pdma_areasize = pdma_size;
 264 }
 265
 266 extern int sparc_floppy_request_irq(unsigned int irq,
 267                                     irq_handler_t irq_handler);
 268
 269 static int sun_fd_request_irq(void)
 270 {
 271         static int once = 0;
 272
 273         if (!once) {
 274                 once = 1;
 275                 return sparc_floppy_request_irq(FLOPPY_IRQ, floppy_interrupt);
 276         } else {
 277                 return 0;
 278         }
 279 }
 280
 281 static struct linux_prom_registers fd_regs[2];
 282
 283 static int sun_floppy_init(void)
 284 {
 285         struct platform_device *op;
 286         struct device_node *dp;
 287         struct resource r;
 288         char state[128];
 289         phandle fd_node;
 290         phandle tnode;
 291         int num_regs;
 292
 293         use_virtual_dma = 1;
 294
 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 != sun4m) {
 299                 /* We certainly don't have a floppy controller. */
 300                 goto no_sun_fdc;
 301         }
 302         /* Well, try to find one. */
 303         tnode = prom_getchild(prom_root_node);
 304         fd_node = prom_searchsiblings(tnode, "obio");
 305         if (fd_node != 0) {
 306                 tnode = prom_getchild(fd_node);
 307                 fd_node = prom_searchsiblings(tnode, "SUNW,fdtwo");
 308         } else {
 309                 fd_node = prom_searchsiblings(tnode, "fd");
 310         }
 311         if (fd_node == 0) {
 312                 goto no_sun_fdc;
 313         }
 314
 315         /* The sun4m lets us know if the controller is actually usable. */
 316         if (prom_getproperty(fd_node, "status", state, sizeof(state)) != -1) {
 317                 if(!strcmp(state, "disabled")) {
 318                         goto no_sun_fdc;
 319                 }
 320         }
 321         num_regs = prom_getproperty(fd_node, "reg", (char *) fd_regs, sizeof(fd_regs));
 322         num_regs = (num_regs / sizeof(fd_regs[0]));
 323         prom_apply_obio_ranges(fd_regs, num_regs);
 324         memset(&r, 0, sizeof(r));
 325         r.flags = fd_regs[0].which_io;
 326         r.start = fd_regs[0].phys_addr;
 327         sun_fdc = of_ioremap(&r, 0, fd_regs[0].reg_size, "floppy");
 328
 329         /* Look up irq in platform_device.
 330          * We try "SUNW,fdtwo" and "fd"
 331          */
 332         op = NULL;
 333         for_each_node_by_name(dp, "SUNW,fdtwo") {
 334                 op = of_find_device_by_node(dp);
 335                 if (op)
 336                         break;
 337         }
 338         if (!op) {
 339                 for_each_node_by_name(dp, "fd") {
 340                         op = of_find_device_by_node(dp);
 341                         if (op)
 342                                 break;
 343                 }
 344         }
 345         if (!op)
 346                 goto no_sun_fdc;
 347
 348         FLOPPY_IRQ = op->archdata.irqs[0];
 349
 350         /* Last minute sanity check... */
 351         if (sun_fdc->status_82072 == 0xff) {
 352                 sun_fdc = NULL;
 353                 goto no_sun_fdc;
 354         }
 355
 356         sun_fdops.fd_inb = sun_82077_fd_inb;
 357         sun_fdops.fd_outb = sun_82077_fd_outb;
 358         fdc_status = &sun_fdc->status_82077;
 359
 360         if (sun_fdc->dor_82077 == 0x80) {
 361                 sun_fdc->dor_82077 = 0x02;
 362                 if (sun_fdc->dor_82077 == 0x80) {
 363                         sun_fdops.fd_inb = sun_82072_fd_inb;
 364                         sun_fdops.fd_outb = sun_82072_fd_outb;
 365                         fdc_status = &sun_fdc->status_82072;
 366                 }
 367         }
 368
 369         /* Success... */
 370         allowed_drive_mask = 0x01;
 371         return (int) sun_fdc;
 372
 373 no_sun_fdc:
 374         return -1;
 375 }
 376
 377 static int sparc_eject(void)
 378 {
 379         set_dor(0x00, 0xff, 0x90);
 380         udelay(500);
 381         set_dor(0x00, 0x6f, 0x00);
 382         udelay(500);
 383         return 0;
 384 }
 385
 386 #define fd_eject(drive) sparc_eject()
 387
 388 #define EXTRA_FLOPPY_PARAMS
 389
 390 static DEFINE_SPINLOCK(dma_spin_lock);
 391
 392 #define claim_dma_lock() \
 393 ({      unsigned long flags; \
 394         spin_lock_irqsave(&dma_spin_lock, flags); \
 395         flags; \
 396 })
 397
 398 #define release_dma_lock(__flags) \
 399         spin_unlock_irqrestore(&dma_spin_lock, __flags);
 400
 401 #endif /* !(__ASM_SPARC_FLOPPY_H) */