arch/sparc/include/asm/floppy_32.h

   1 /* SPDX-License-Identifier: GPL-2.0 */
   2 /* asm/floppy.h: Sparc specific parts of the Floppy driver.
   3  *
   4  * Copyright (C) 1995 David S. Miller (davem@davemloft.net)
   5  */
   6
   7 #ifndef __ASM_SPARC_FLOPPY_H
   8 #define __ASM_SPARC_FLOPPY_H
   9
  10 #include <linux/of.h>
  11 #include <linux/of_platform.h>
  12 #include <linux/pgtable.h>
  13
  14 #include <asm/idprom.h>
  15 #include <asm/oplib.h>
  16 #include <asm/auxio.h>
  17 #include <asm/setup.h>
  18 #include <asm/page.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
  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(base, reg)         sun_fdops.fd_inb(reg)
  63 #define fd_outb(value, base, reg) sun_fdops.fd_outb(value, reg)
  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_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) {
 118         default:
 119                 printk("floppy: Asked to read unknown port %d\n", port);
 120                 panic("floppy: Port bolixed.");
 121         case FD_STATUS:
 122                 return sun_fdc->status_82072 & ~STATUS_DMA;
 123         case FD_DATA:
 124                 return sun_fdc->data_82072;
 125         case 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) {
 135         default:
 136                 printk("floppy: Asked to write to unknown port %d\n", port);
 137                 panic("floppy: Port bolixed.");
 138         case FD_DOR:
 139                 sun_set_dor(value, 0);
 140                 break;
 141         case FD_DATA:
 142                 sun_fdc->data_82072 = value;
 143                 break;
 144         case FD_DCR:
 145                 sun_fdc->dcr_82072 = value;
 146                 break;
 147         case FD_DSR:
 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) {
 158         default:
 159                 printk("floppy: Asked to read unknown port %d\n", port);
 160                 panic("floppy: Port bolixed.");
 161         case FD_SRA:
 162                 return sun_fdc->status1_82077;
 163         case FD_SRB:
 164                 return sun_fdc->status2_82077;
 165         case FD_DOR:
 166                 return sun_fdc->dor_82077;
 167         case FD_TDR:
 168                 return sun_fdc->tapectl_82077;
 169         case FD_STATUS:
 170                 return sun_fdc->status_82077 & ~STATUS_DMA;
 171         case FD_DATA:
 172                 return sun_fdc->data_82077;
 173         case 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) {
 183         default:
 184                 printk("floppy: Asked to write to unknown port %d\n", port);
 185                 panic("floppy: Port bolixed.");
 186         case FD_DOR:
 187                 sun_set_dor(value, 1);
 188                 break;
 189         case FD_DATA:
 190                 sun_fdc->data_82077 = value;
 191                 break;
 192         case FD_DCR:
 193                 sun_fdc->dcr_82077 = value;
 194                 break;
 195         case FD_DSR:
 196                 sun_fdc->status_82077 = value;
 197                 break;
 198         case 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
 216 /* Common routines to all controller types on the Sparc. */
 217 static inline void virtual_dma_init(void)
 218 {
 219         /* nothing... */
 220 }
 221
 222 static inline void sun_fd_disable_dma(void)
 223 {
 224         doing_pdma = 0;
 225         pdma_base = NULL;
 226 }
 227
 228 static inline void sun_fd_set_dma_mode(int mode)
 229 {
 230         switch(mode) {
 231         case DMA_MODE_READ:
 232                 doing_pdma = 1;
 233                 break;
 234         case DMA_MODE_WRITE:
 235                 doing_pdma = 2;
 236                 break;
 237         default:
 238                 printk("Unknown dma mode %d\n", mode);
 239                 panic("floppy: Giving up...");
 240         }
 241 }
 242
 243 static inline void sun_fd_set_dma_addr(char *buffer)
 244 {
 245         pdma_vaddr = buffer;
 246 }
 247
 248 static inline void sun_fd_set_dma_count(int length)
 249 {
 250         pdma_size = length;
 251 }
 252
 253 static inline void sun_fd_enable_dma(void)
 254 {
 255         pdma_base = pdma_vaddr;
 256         pdma_areasize = pdma_size;
 257 }
 258
 259 int sparc_floppy_request_irq(unsigned int irq, irq_handler_t irq_handler);
 260
 261 static int sun_fd_request_irq(void)
 262 {
 263         static int once = 0;
 264
 265         if (!once) {
 266                 once = 1;
 267                 return sparc_floppy_request_irq(FLOPPY_IRQ, floppy_interrupt);
 268         } else {
 269                 return 0;
 270         }
 271 }
 272
 273 static struct linux_prom_registers fd_regs[2];
 274
 275 static int sun_floppy_init(void)
 276 {
 277         struct platform_device *op;
 278         struct device_node *dp;
 279         struct resource r;
 280         char state[128];
 281         phandle fd_node;
 282         phandle tnode;
 283         int num_regs;
 284
 285         use_virtual_dma = 1;
 286
 287         /* Forget it if we aren't on a machine that could possibly
 288          * ever have a floppy drive.
 289          */
 290         if (sparc_cpu_model != sun4m) {
 291                 /* We certainly don't have a floppy controller. */
 292                 goto no_sun_fdc;
 293         }
 294         /* Well, try to find one. */
 295         tnode = prom_getchild(prom_root_node);
 296         fd_node = prom_searchsiblings(tnode, "obio");
 297         if (fd_node != 0) {
 298                 tnode = prom_getchild(fd_node);
 299                 fd_node = prom_searchsiblings(tnode, "SUNW,fdtwo");
 300         } else {
 301                 fd_node = prom_searchsiblings(tnode, "fd");
 302         }
 303         if (fd_node == 0) {
 304                 goto no_sun_fdc;
 305         }
 306
 307         /* The sun4m lets us know if the controller is actually usable. */
 308         if (prom_getproperty(fd_node, "status", state, sizeof(state)) != -1) {
 309                 if(!strcmp(state, "disabled")) {
 310                         goto no_sun_fdc;
 311                 }
 312         }
 313         num_regs = prom_getproperty(fd_node, "reg", (char *) fd_regs, sizeof(fd_regs));
 314         num_regs = (num_regs / sizeof(fd_regs[0]));
 315         prom_apply_obio_ranges(fd_regs, num_regs);
 316         memset(&r, 0, sizeof(r));
 317         r.flags = fd_regs[0].which_io;
 318         r.start = fd_regs[0].phys_addr;
 319         sun_fdc = of_ioremap(&r, 0, fd_regs[0].reg_size, "floppy");
 320
 321         /* Look up irq in platform_device.
 322          * We try "SUNW,fdtwo" and "fd"
 323          */
 324         op = NULL;
 325         for_each_node_by_name(dp, "SUNW,fdtwo") {
 326                 op = of_find_device_by_node(dp);
 327                 if (op)
 328                         break;
 329         }
 330         if (!op) {
 331                 for_each_node_by_name(dp, "fd") {
 332                         op = of_find_device_by_node(dp);
 333                         if (op)
 334                                 break;
 335                 }
 336         }
 337         if (!op)
 338                 goto no_sun_fdc;
 339
 340         FLOPPY_IRQ = op->archdata.irqs[0];
 341
 342         /* Last minute sanity check... */
 343         if (sun_fdc->status_82072 == 0xff) {
 344                 sun_fdc = NULL;
 345                 goto no_sun_fdc;
 346         }
 347
 348         sun_fdops.fd_inb = sun_82077_fd_inb;
 349         sun_fdops.fd_outb = sun_82077_fd_outb;
 350         fdc_status = &sun_fdc->status_82077;
 351
 352         if (sun_fdc->dor_82077 == 0x80) {
 353                 sun_fdc->dor_82077 = 0x02;
 354                 if (sun_fdc->dor_82077 == 0x80) {
 355                         sun_fdops.fd_inb = sun_82072_fd_inb;
 356                         sun_fdops.fd_outb = sun_82072_fd_outb;
 357                         fdc_status = &sun_fdc->status_82072;
 358                 }
 359         }
 360
 361         /* Success... */
 362         allowed_drive_mask = 0x01;
 363         return (int) sun_fdc;
 364
 365 no_sun_fdc:
 366         return -1;
 367 }
 368
 369 static int sparc_eject(void)
 370 {
 371         set_dor(0x00, 0xff, 0x90);
 372         udelay(500);
 373         set_dor(0x00, 0x6f, 0x00);
 374         udelay(500);
 375         return 0;
 376 }
 377
 378 #define fd_eject(drive) sparc_eject()
 379
 380 #define EXTRA_FLOPPY_PARAMS
 381
 382 static DEFINE_SPINLOCK(dma_spin_lock);
 383
 384 #define claim_dma_lock() \
 385 ({      unsigned long flags; \
 386         spin_lock_irqsave(&dma_spin_lock, flags); \
 387         flags; \
 388 })
 389
 390 #define release_dma_lock(__flags) \
 391         spin_unlock_irqrestore(&dma_spin_lock, __flags);
 392
 393 #endif /* !(__ASM_SPARC_FLOPPY_H) */