drivers/parport/parport_sunbpp.c

   1 /* parport_sunbpp.c: Parallel-port routines for SBUS
   2  *
   3  * Author: Derrick J. Brashear <shadow@dementia.org>
   4  *
   5  * based on work by:
   6  *          Phil Blundell <philb@gnu.org>
   7  *          Tim Waugh <tim@cyberelk.demon.co.uk>
   8  *          Jose Renau <renau@acm.org>
   9  *          David Campbell <campbell@tirian.che.curtin.edu.au>
  10  *          Grant Guenther <grant@torque.net>
  11  *          Eddie C. Dost <ecd@skynet.be>
  12  *          Stephen Williams (steve@icarus.com)
  13  *          Gus Baldauf (gbaldauf@ix.netcom.com)
  14  *          Peter Zaitcev
  15  *          Tom Dyas
  16  *
  17  * Updated to new SBUS device framework: David S. Miller <davem@davemloft.net>
  18  *
  19  */
  20
  21 #include <linux/string.h>
  22 #include <linux/module.h>
  23 #include <linux/delay.h>
  24 #include <linux/errno.h>
  25 #include <linux/ioport.h>
  26 #include <linux/kernel.h>
  27 #include <linux/slab.h>
  28 #include <linux/init.h>
  29 #include <linux/of.h>
  30 #include <linux/of_device.h>
  31
  32 #include <linux/parport.h>
  33
  34 #include <asm/ptrace.h>
  35 #include <linux/interrupt.h>
  36
  37 #include <asm/io.h>
  38 #include <asm/oplib.h>           /* OpenProm Library */
  39 #include <asm/dma.h>             /* BPP uses LSI 64854 for DMA */
  40 #include <asm/irq.h>
  41 #include <asm/sunbpp.h>
  42
  43 #undef __SUNBPP_DEBUG
  44 #ifdef __SUNBPP_DEBUG
  45 #define dprintk(x) printk x
  46 #else
  47 #define dprintk(x)
  48 #endif
  49
  50 static void parport_sunbpp_disable_irq(struct parport *p)
  51 {
  52         struct bpp_regs __iomem *regs = (struct bpp_regs __iomem *)p->base;
  53         u32 tmp;
  54
  55         tmp = sbus_readl(&regs->p_csr);
  56         tmp &= ~DMA_INT_ENAB;
  57         sbus_writel(tmp, &regs->p_csr);
  58 }
  59
  60 static void parport_sunbpp_enable_irq(struct parport *p)
  61 {
  62         struct bpp_regs __iomem *regs = (struct bpp_regs __iomem *)p->base;
  63         u32 tmp;
  64
  65         tmp = sbus_readl(&regs->p_csr);
  66         tmp |= DMA_INT_ENAB;
  67         sbus_writel(tmp, &regs->p_csr);
  68 }
  69
  70 static void parport_sunbpp_write_data(struct parport *p, unsigned char d)
  71 {
  72         struct bpp_regs __iomem *regs = (struct bpp_regs __iomem *)p->base;
  73
  74         sbus_writeb(d, &regs->p_dr);
  75         dprintk((KERN_DEBUG "wrote 0x%x\n", d));
  76 }
  77
  78 static unsigned char parport_sunbpp_read_data(struct parport *p)
  79 {
  80         struct bpp_regs __iomem *regs = (struct bpp_regs __iomem *)p->base;
  81
  82         return sbus_readb(&regs->p_dr);
  83 }
  84
  85 #if 0
  86 static void control_pc_to_sunbpp(struct parport *p, unsigned char status)
  87 {
  88         struct bpp_regs __iomem *regs = (struct bpp_regs __iomem *)p->base;
  89         unsigned char value_tcr = sbus_readb(&regs->p_tcr);
  90         unsigned char value_or = sbus_readb(&regs->p_or);
  91
  92         if (status & PARPORT_CONTROL_STROBE)
  93                 value_tcr |= P_TCR_DS;
  94         if (status & PARPORT_CONTROL_AUTOFD)
  95                 value_or |= P_OR_AFXN;
  96         if (status & PARPORT_CONTROL_INIT)
  97                 value_or |= P_OR_INIT;
  98         if (status & PARPORT_CONTROL_SELECT)
  99                 value_or |= P_OR_SLCT_IN;
 100
 101         sbus_writeb(value_or, &regs->p_or);
 102         sbus_writeb(value_tcr, &regs->p_tcr);
 103 }
 104 #endif
 105
 106 static unsigned char status_sunbpp_to_pc(struct parport *p)
 107 {
 108         struct bpp_regs __iomem *regs = (struct bpp_regs __iomem *)p->base;
 109         unsigned char bits = 0;
 110         unsigned char value_tcr = sbus_readb(&regs->p_tcr);
 111         unsigned char value_ir = sbus_readb(&regs->p_ir);
 112
 113         if (!(value_ir & P_IR_ERR))
 114                 bits |= PARPORT_STATUS_ERROR;
 115         if (!(value_ir & P_IR_SLCT))
 116                 bits |= PARPORT_STATUS_SELECT;
 117         if (!(value_ir & P_IR_PE))
 118                 bits |= PARPORT_STATUS_PAPEROUT;
 119         if (value_tcr & P_TCR_ACK)
 120                 bits |= PARPORT_STATUS_ACK;
 121         if (!(value_tcr & P_TCR_BUSY))
 122                 bits |= PARPORT_STATUS_BUSY;
 123
 124         dprintk((KERN_DEBUG "tcr 0x%x ir 0x%x\n", value_tcr, value_ir));
 125         dprintk((KERN_DEBUG "read status 0x%x\n", bits));
 126         return bits;
 127 }
 128
 129 static unsigned char control_sunbpp_to_pc(struct parport *p)
 130 {
 131         struct bpp_regs __iomem *regs = (struct bpp_regs __iomem *)p->base;
 132         unsigned char bits = 0;
 133         unsigned char value_tcr = sbus_readb(&regs->p_tcr);
 134         unsigned char value_or = sbus_readb(&regs->p_or);
 135
 136         if (!(value_tcr & P_TCR_DS))
 137                 bits |= PARPORT_CONTROL_STROBE;
 138         if (!(value_or & P_OR_AFXN))
 139                 bits |= PARPORT_CONTROL_AUTOFD;
 140         if (!(value_or & P_OR_INIT))
 141                 bits |= PARPORT_CONTROL_INIT;
 142         if (value_or & P_OR_SLCT_IN)
 143                 bits |= PARPORT_CONTROL_SELECT;
 144
 145         dprintk((KERN_DEBUG "tcr 0x%x or 0x%x\n", value_tcr, value_or));
 146         dprintk((KERN_DEBUG "read control 0x%x\n", bits));
 147         return bits;
 148 }
 149
 150 static unsigned char parport_sunbpp_read_control(struct parport *p)
 151 {
 152         return control_sunbpp_to_pc(p);
 153 }
 154
 155 static unsigned char parport_sunbpp_frob_control(struct parport *p,
 156                                                  unsigned char mask,
 157                                                  unsigned char val)
 158 {
 159         struct bpp_regs __iomem *regs = (struct bpp_regs __iomem *)p->base;
 160         unsigned char value_tcr = sbus_readb(&regs->p_tcr);
 161         unsigned char value_or = sbus_readb(&regs->p_or);
 162
 163         dprintk((KERN_DEBUG "frob1: tcr 0x%x or 0x%x\n",
 164                  value_tcr, value_or));
 165         if (mask & PARPORT_CONTROL_STROBE) {
 166                 if (val & PARPORT_CONTROL_STROBE) {
 167                         value_tcr &= ~P_TCR_DS;
 168                 } else {
 169                         value_tcr |= P_TCR_DS;
 170                 }
 171         }
 172         if (mask & PARPORT_CONTROL_AUTOFD) {
 173                 if (val & PARPORT_CONTROL_AUTOFD) {
 174                         value_or &= ~P_OR_AFXN;
 175                 } else {
 176                         value_or |= P_OR_AFXN;
 177                 }
 178         }
 179         if (mask & PARPORT_CONTROL_INIT) {
 180                 if (val & PARPORT_CONTROL_INIT) {
 181                         value_or &= ~P_OR_INIT;
 182                 } else {
 183                         value_or |= P_OR_INIT;
 184                 }
 185         }
 186         if (mask & PARPORT_CONTROL_SELECT) {
 187                 if (val & PARPORT_CONTROL_SELECT) {
 188                         value_or |= P_OR_SLCT_IN;
 189                 } else {
 190                         value_or &= ~P_OR_SLCT_IN;
 191                 }
 192         }
 193
 194         sbus_writeb(value_or, &regs->p_or);
 195         sbus_writeb(value_tcr, &regs->p_tcr);
 196         dprintk((KERN_DEBUG "frob2: tcr 0x%x or 0x%x\n",
 197                  value_tcr, value_or));
 198         return parport_sunbpp_read_control(p);
 199 }
 200
 201 static void parport_sunbpp_write_control(struct parport *p, unsigned char d)
 202 {
 203         const unsigned char wm = (PARPORT_CONTROL_STROBE |
 204                                   PARPORT_CONTROL_AUTOFD |
 205                                   PARPORT_CONTROL_INIT |
 206                                   PARPORT_CONTROL_SELECT);
 207
 208         parport_sunbpp_frob_control (p, wm, d & wm);
 209 }
 210
 211 static unsigned char parport_sunbpp_read_status(struct parport *p)
 212 {
 213         return status_sunbpp_to_pc(p);
 214 }
 215
 216 static void parport_sunbpp_data_forward (struct parport *p)
 217 {
 218         struct bpp_regs __iomem *regs = (struct bpp_regs __iomem *)p->base;
 219         unsigned char value_tcr = sbus_readb(&regs->p_tcr);
 220
 221         dprintk((KERN_DEBUG "forward\n"));
 222         value_tcr &= ~P_TCR_DIR;
 223         sbus_writeb(value_tcr, &regs->p_tcr);
 224 }
 225
 226 static void parport_sunbpp_data_reverse (struct parport *p)
 227 {
 228         struct bpp_regs __iomem *regs = (struct bpp_regs __iomem *)p->base;
 229         u8 val = sbus_readb(&regs->p_tcr);
 230
 231         dprintk((KERN_DEBUG "reverse\n"));
 232         val |= P_TCR_DIR;
 233         sbus_writeb(val, &regs->p_tcr);
 234 }
 235
 236 static void parport_sunbpp_init_state(struct pardevice *dev, struct parport_state *s)
 237 {
 238         s->u.pc.ctr = 0xc;
 239         s->u.pc.ecr = 0x0;
 240 }
 241
 242 static void parport_sunbpp_save_state(struct parport *p, struct parport_state *s)
 243 {
 244         s->u.pc.ctr = parport_sunbpp_read_control(p);
 245 }
 246
 247 static void parport_sunbpp_restore_state(struct parport *p, struct parport_state *s)
 248 {
 249         parport_sunbpp_write_control(p, s->u.pc.ctr);
 250 }
 251
 252 static struct parport_operations parport_sunbpp_ops =
 253 {
 254         .write_data     = parport_sunbpp_write_data,
 255         .read_data      = parport_sunbpp_read_data,
 256
 257         .write_control  = parport_sunbpp_write_control,
 258         .read_control   = parport_sunbpp_read_control,
 259         .frob_control   = parport_sunbpp_frob_control,
 260
 261         .read_status    = parport_sunbpp_read_status,
 262
 263         .enable_irq     = parport_sunbpp_enable_irq,
 264         .disable_irq    = parport_sunbpp_disable_irq,
 265
 266         .data_forward   = parport_sunbpp_data_forward,
 267         .data_reverse   = parport_sunbpp_data_reverse,
 268
 269         .init_state     = parport_sunbpp_init_state,
 270         .save_state     = parport_sunbpp_save_state,
 271         .restore_state  = parport_sunbpp_restore_state,
 272
 273         .epp_write_data = parport_ieee1284_epp_write_data,
 274         .epp_read_data  = parport_ieee1284_epp_read_data,
 275         .epp_write_addr = parport_ieee1284_epp_write_addr,
 276         .epp_read_addr  = parport_ieee1284_epp_read_addr,
 277
 278         .ecp_write_data = parport_ieee1284_ecp_write_data,
 279         .ecp_read_data  = parport_ieee1284_ecp_read_data,
 280         .ecp_write_addr = parport_ieee1284_ecp_write_addr,
 281
 282         .compat_write_data      = parport_ieee1284_write_compat,
 283         .nibble_read_data       = parport_ieee1284_read_nibble,
 284         .byte_read_data         = parport_ieee1284_read_byte,
 285
 286         .owner          = THIS_MODULE,
 287 };
 288
 289 static int __devinit bpp_probe(struct of_device *op, const struct of_device_id *match)
 290 {
 291         struct parport_operations *ops;
 292         struct bpp_regs __iomem *regs;
 293         int irq, dma, err = 0, size;
 294         unsigned char value_tcr;
 295         void __iomem *base;
 296         struct parport *p;
 297
 298         irq = op->irqs[0];
 299         base = of_ioremap(&op->resource[0], 0,
 300                           resource_size(&op->resource[0]),
 301                           "sunbpp");
 302         if (!base)
 303                 return -ENODEV;
 304
 305         size = resource_size(&op->resource[0]);
 306         dma = PARPORT_DMA_NONE;
 307
 308         ops = kmalloc(sizeof(struct parport_operations), GFP_KERNEL);
 309         if (!ops)
 310                 goto out_unmap;
 311
 312         memcpy (ops, &parport_sunbpp_ops, sizeof(struct parport_operations));
 313
 314         dprintk(("register_port\n"));
 315         if (!(p = parport_register_port((unsigned long)base, irq, dma, ops)))
 316                 goto out_free_ops;
 317
 318         p->size = size;
 319         p->dev = &op->dev;
 320
 321         if ((err = request_irq(p->irq, parport_irq_handler,
 322                                IRQF_SHARED, p->name, p)) != 0) {
 323                 goto out_put_port;
 324         }
 325
 326         parport_sunbpp_enable_irq(p);
 327
 328         regs = (struct bpp_regs __iomem *)p->base;
 329
 330         value_tcr = sbus_readb(&regs->p_tcr);
 331         value_tcr &= ~P_TCR_DIR;
 332         sbus_writeb(value_tcr, &regs->p_tcr);
 333
 334         printk(KERN_INFO "%s: sunbpp at 0x%lx\n", p->name, p->base);
 335
 336         dev_set_drvdata(&op->dev, p);
 337
 338         parport_announce_port(p);
 339
 340         return 0;
 341
 342 out_put_port:
 343         parport_put_port(p);
 344
 345 out_free_ops:
 346         kfree(ops);
 347
 348 out_unmap:
 349         of_iounmap(&op->resource[0], base, size);
 350
 351         return err;
 352 }
 353
 354 static int __devexit bpp_remove(struct of_device *op)
 355 {
 356         struct parport *p = dev_get_drvdata(&op->dev);
 357         struct parport_operations *ops = p->ops;
 358
 359         parport_remove_port(p);
 360
 361         if (p->irq != PARPORT_IRQ_NONE) {
 362                 parport_sunbpp_disable_irq(p);
 363                 free_irq(p->irq, p);
 364         }
 365
 366         of_iounmap(&op->resource[0], (void __iomem *) p->base, p->size);
 367         parport_put_port(p);
 368         kfree(ops);
 369
 370         dev_set_drvdata(&op->dev, NULL);
 371
 372         return 0;
 373 }
 374
 375 static const struct of_device_id bpp_match[] = {
 376         {
 377                 .name = "SUNW,bpp",
 378         },
 379         {},
 380 };
 381
 382 MODULE_DEVICE_TABLE(of, bpp_match);
 383
 384 static struct of_platform_driver bpp_sbus_driver = {
 385         .driver = {
 386                 .name = "bpp",
 387                 .owner = THIS_MODULE,
 388                 .of_match_table = bpp_match,
 389         },
 390         .probe          = bpp_probe,
 391         .remove         = __devexit_p(bpp_remove),
 392 };
 393
 394 static int __init parport_sunbpp_init(void)
 395 {
 396         return of_register_driver(&bpp_sbus_driver, &of_bus_type);
 397 }
 398
 399 static void __exit parport_sunbpp_exit(void)
 400 {
 401         of_unregister_driver(&bpp_sbus_driver);
 402 }
 403
 404 MODULE_AUTHOR("Derrick J Brashear");
 405 MODULE_DESCRIPTION("Parport Driver for Sparc bidirectional Port");
 406 MODULE_SUPPORTED_DEVICE("Sparc Bidirectional Parallel Port");
 407 MODULE_VERSION("2.0");
 408 MODULE_LICENSE("GPL");
 409
 410 module_init(parport_sunbpp_init)
 411 module_exit(parport_sunbpp_exit)