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
  30 #include <linux/parport.h>
  31
  32 #include <asm/ptrace.h>
  33 #include <linux/interrupt.h>
  34
  35 #include <asm/io.h>
  36 #include <asm/oplib.h>           /* OpenProm Library */
  37 #include <asm/sbus.h>
  38 #include <asm/dma.h>             /* BPP uses LSI 64854 for DMA */
  39 #include <asm/irq.h>
  40 #include <asm/sunbpp.h>
  41
  42 #undef __SUNBPP_DEBUG
  43 #ifdef __SUNBPP_DEBUG
  44 #define dprintk(x) printk x
  45 #else
  46 #define dprintk(x)
  47 #endif
  48
  49 static irqreturn_t parport_sunbpp_interrupt(int irq, void *dev_id)
  50 {
  51         parport_generic_irq(irq, (struct parport *) dev_id);
  52         return IRQ_HANDLED;
  53 }
  54
  55 static void parport_sunbpp_disable_irq(struct parport *p)
  56 {
  57         struct bpp_regs __iomem *regs = (struct bpp_regs __iomem *)p->base;
  58         u32 tmp;
  59
  60         tmp = sbus_readl(&regs->p_csr);
  61         tmp &= ~DMA_INT_ENAB;
  62         sbus_writel(tmp, &regs->p_csr);
  63 }
  64
  65 static void parport_sunbpp_enable_irq(struct parport *p)
  66 {
  67         struct bpp_regs __iomem *regs = (struct bpp_regs __iomem *)p->base;
  68         u32 tmp;
  69
  70         tmp = sbus_readl(&regs->p_csr);
  71         tmp |= DMA_INT_ENAB;
  72         sbus_writel(tmp, &regs->p_csr);
  73 }
  74
  75 static void parport_sunbpp_write_data(struct parport *p, unsigned char d)
  76 {
  77         struct bpp_regs __iomem *regs = (struct bpp_regs __iomem *)p->base;
  78
  79         sbus_writeb(d, &regs->p_dr);
  80         dprintk((KERN_DEBUG "wrote 0x%x\n", d));
  81 }
  82
  83 static unsigned char parport_sunbpp_read_data(struct parport *p)
  84 {
  85         struct bpp_regs __iomem *regs = (struct bpp_regs __iomem *)p->base;
  86
  87         return sbus_readb(&regs->p_dr);
  88 }
  89
  90 #if 0
  91 static void control_pc_to_sunbpp(struct parport *p, unsigned char status)
  92 {
  93         struct bpp_regs __iomem *regs = (struct bpp_regs __iomem *)p->base;
  94         unsigned char value_tcr = sbus_readb(&regs->p_tcr);
  95         unsigned char value_or = sbus_readb(&regs->p_or);
  96
  97         if (status & PARPORT_CONTROL_STROBE)
  98                 value_tcr |= P_TCR_DS;
  99         if (status & PARPORT_CONTROL_AUTOFD)
 100                 value_or |= P_OR_AFXN;
 101         if (status & PARPORT_CONTROL_INIT)
 102                 value_or |= P_OR_INIT;
 103         if (status & PARPORT_CONTROL_SELECT)
 104                 value_or |= P_OR_SLCT_IN;
 105
 106         sbus_writeb(value_or, &regs->p_or);
 107         sbus_writeb(value_tcr, &regs->p_tcr);
 108 }
 109 #endif
 110
 111 static unsigned char status_sunbpp_to_pc(struct parport *p)
 112 {
 113         struct bpp_regs __iomem *regs = (struct bpp_regs __iomem *)p->base;
 114         unsigned char bits = 0;
 115         unsigned char value_tcr = sbus_readb(&regs->p_tcr);
 116         unsigned char value_ir = sbus_readb(&regs->p_ir);
 117
 118         if (!(value_ir & P_IR_ERR))
 119                 bits |= PARPORT_STATUS_ERROR;
 120         if (!(value_ir & P_IR_SLCT))
 121                 bits |= PARPORT_STATUS_SELECT;
 122         if (!(value_ir & P_IR_PE))
 123                 bits |= PARPORT_STATUS_PAPEROUT;
 124         if (value_tcr & P_TCR_ACK)
 125                 bits |= PARPORT_STATUS_ACK;
 126         if (!(value_tcr & P_TCR_BUSY))
 127                 bits |= PARPORT_STATUS_BUSY;
 128
 129         dprintk((KERN_DEBUG "tcr 0x%x ir 0x%x\n", value_tcr, value_ir));
 130         dprintk((KERN_DEBUG "read status 0x%x\n", bits));
 131         return bits;
 132 }
 133
 134 static unsigned char control_sunbpp_to_pc(struct parport *p)
 135 {
 136         struct bpp_regs __iomem *regs = (struct bpp_regs __iomem *)p->base;
 137         unsigned char bits = 0;
 138         unsigned char value_tcr = sbus_readb(&regs->p_tcr);
 139         unsigned char value_or = sbus_readb(&regs->p_or);
 140
 141         if (!(value_tcr & P_TCR_DS))
 142                 bits |= PARPORT_CONTROL_STROBE;
 143         if (!(value_or & P_OR_AFXN))
 144                 bits |= PARPORT_CONTROL_AUTOFD;
 145         if (!(value_or & P_OR_INIT))
 146                 bits |= PARPORT_CONTROL_INIT;
 147         if (value_or & P_OR_SLCT_IN)
 148                 bits |= PARPORT_CONTROL_SELECT;
 149
 150         dprintk((KERN_DEBUG "tcr 0x%x or 0x%x\n", value_tcr, value_or));
 151         dprintk((KERN_DEBUG "read control 0x%x\n", bits));
 152         return bits;
 153 }
 154
 155 static unsigned char parport_sunbpp_read_control(struct parport *p)
 156 {
 157         return control_sunbpp_to_pc(p);
 158 }
 159
 160 static unsigned char parport_sunbpp_frob_control(struct parport *p,
 161                                                  unsigned char mask,
 162                                                  unsigned char val)
 163 {
 164         struct bpp_regs __iomem *regs = (struct bpp_regs __iomem *)p->base;
 165         unsigned char value_tcr = sbus_readb(&regs->p_tcr);
 166         unsigned char value_or = sbus_readb(&regs->p_or);
 167
 168         dprintk((KERN_DEBUG "frob1: tcr 0x%x or 0x%x\n",
 169                  value_tcr, value_or));
 170         if (mask & PARPORT_CONTROL_STROBE) {
 171                 if (val & PARPORT_CONTROL_STROBE) {
 172                         value_tcr &= ~P_TCR_DS;
 173                 } else {
 174                         value_tcr |= P_TCR_DS;
 175                 }
 176         }
 177         if (mask & PARPORT_CONTROL_AUTOFD) {
 178                 if (val & PARPORT_CONTROL_AUTOFD) {
 179                         value_or &= ~P_OR_AFXN;
 180                 } else {
 181                         value_or |= P_OR_AFXN;
 182                 }
 183         }
 184         if (mask & PARPORT_CONTROL_INIT) {
 185                 if (val & PARPORT_CONTROL_INIT) {
 186                         value_or &= ~P_OR_INIT;
 187                 } else {
 188                         value_or |= P_OR_INIT;
 189                 }
 190         }
 191         if (mask & PARPORT_CONTROL_SELECT) {
 192                 if (val & PARPORT_CONTROL_SELECT) {
 193                         value_or |= P_OR_SLCT_IN;
 194                 } else {
 195                         value_or &= ~P_OR_SLCT_IN;
 196                 }
 197         }
 198
 199         sbus_writeb(value_or, &regs->p_or);
 200         sbus_writeb(value_tcr, &regs->p_tcr);
 201         dprintk((KERN_DEBUG "frob2: tcr 0x%x or 0x%x\n",
 202                  value_tcr, value_or));
 203         return parport_sunbpp_read_control(p);
 204 }
 205
 206 static void parport_sunbpp_write_control(struct parport *p, unsigned char d)
 207 {
 208         const unsigned char wm = (PARPORT_CONTROL_STROBE |
 209                                   PARPORT_CONTROL_AUTOFD |
 210                                   PARPORT_CONTROL_INIT |
 211                                   PARPORT_CONTROL_SELECT);
 212
 213         parport_sunbpp_frob_control (p, wm, d & wm);
 214 }
 215
 216 static unsigned char parport_sunbpp_read_status(struct parport *p)
 217 {
 218         return status_sunbpp_to_pc(p);
 219 }
 220
 221 static void parport_sunbpp_data_forward (struct parport *p)
 222 {
 223         struct bpp_regs __iomem *regs = (struct bpp_regs __iomem *)p->base;
 224         unsigned char value_tcr = sbus_readb(&regs->p_tcr);
 225
 226         dprintk((KERN_DEBUG "forward\n"));
 227         value_tcr &= ~P_TCR_DIR;
 228         sbus_writeb(value_tcr, &regs->p_tcr);
 229 }
 230
 231 static void parport_sunbpp_data_reverse (struct parport *p)
 232 {
 233         struct bpp_regs __iomem *regs = (struct bpp_regs __iomem *)p->base;
 234         u8 val = sbus_readb(&regs->p_tcr);
 235
 236         dprintk((KERN_DEBUG "reverse\n"));
 237         val |= P_TCR_DIR;
 238         sbus_writeb(val, &regs->p_tcr);
 239 }
 240
 241 static void parport_sunbpp_init_state(struct pardevice *dev, struct parport_state *s)
 242 {
 243         s->u.pc.ctr = 0xc;
 244         s->u.pc.ecr = 0x0;
 245 }
 246
 247 static void parport_sunbpp_save_state(struct parport *p, struct parport_state *s)
 248 {
 249         s->u.pc.ctr = parport_sunbpp_read_control(p);
 250 }
 251
 252 static void parport_sunbpp_restore_state(struct parport *p, struct parport_state *s)
 253 {
 254         parport_sunbpp_write_control(p, s->u.pc.ctr);
 255 }
 256
 257 static struct parport_operations parport_sunbpp_ops =
 258 {
 259         .write_data     = parport_sunbpp_write_data,
 260         .read_data      = parport_sunbpp_read_data,
 261
 262         .write_control  = parport_sunbpp_write_control,
 263         .read_control   = parport_sunbpp_read_control,
 264         .frob_control   = parport_sunbpp_frob_control,
 265
 266         .read_status    = parport_sunbpp_read_status,
 267
 268         .enable_irq     = parport_sunbpp_enable_irq,
 269         .disable_irq    = parport_sunbpp_disable_irq,
 270
 271         .data_forward   = parport_sunbpp_data_forward,
 272         .data_reverse   = parport_sunbpp_data_reverse,
 273
 274         .init_state     = parport_sunbpp_init_state,
 275         .save_state     = parport_sunbpp_save_state,
 276         .restore_state  = parport_sunbpp_restore_state,
 277
 278         .epp_write_data = parport_ieee1284_epp_write_data,
 279         .epp_read_data  = parport_ieee1284_epp_read_data,
 280         .epp_write_addr = parport_ieee1284_epp_write_addr,
 281         .epp_read_addr  = parport_ieee1284_epp_read_addr,
 282
 283         .ecp_write_data = parport_ieee1284_ecp_write_data,
 284         .ecp_read_data  = parport_ieee1284_ecp_read_data,
 285         .ecp_write_addr = parport_ieee1284_ecp_write_addr,
 286
 287         .compat_write_data      = parport_ieee1284_write_compat,
 288         .nibble_read_data       = parport_ieee1284_read_nibble,
 289         .byte_read_data         = parport_ieee1284_read_byte,
 290
 291         .owner          = THIS_MODULE,
 292 };
 293
 294 static int __devinit init_one_port(struct sbus_dev *sdev)
 295 {
 296         struct parport *p;
 297         /* at least in theory there may be a "we don't dma" case */
 298         struct parport_operations *ops;
 299         void __iomem *base;
 300         int irq, dma, err = 0, size;
 301         struct bpp_regs __iomem *regs;
 302         unsigned char value_tcr;
 303
 304         irq = sdev->irqs[0];
 305         base = sbus_ioremap(&sdev->resource[0], 0,
 306                             sdev->reg_addrs[0].reg_size,
 307                             "sunbpp");
 308         if (!base)
 309                 return -ENODEV;
 310
 311         size = sdev->reg_addrs[0].reg_size;
 312         dma = PARPORT_DMA_NONE;
 313
 314         ops = kmalloc(sizeof(struct parport_operations), GFP_KERNEL);
 315         if (!ops)
 316                 goto out_unmap;
 317
 318         memcpy (ops, &parport_sunbpp_ops, sizeof (struct parport_operations));
 319
 320         dprintk(("register_port\n"));
 321         if (!(p = parport_register_port((unsigned long)base, irq, dma, ops)))
 322                 goto out_free_ops;
 323
 324         p->size = size;
 325         p->dev = &sdev->ofdev.dev;
 326
 327         if ((err = request_irq(p->irq, parport_sunbpp_interrupt,
 328                                IRQF_SHARED, p->name, p)) != 0) {
 329                 goto out_put_port;
 330         }
 331
 332         parport_sunbpp_enable_irq(p);
 333
 334         regs = (struct bpp_regs __iomem *)p->base;
 335
 336         value_tcr = sbus_readb(&regs->p_tcr);
 337         value_tcr &= ~P_TCR_DIR;
 338         sbus_writeb(value_tcr, &regs->p_tcr);
 339
 340         printk(KERN_INFO "%s: sunbpp at 0x%lx\n", p->name, p->base);
 341
 342         dev_set_drvdata(&sdev->ofdev.dev, p);
 343
 344         parport_announce_port(p);
 345
 346         return 0;
 347
 348 out_put_port:
 349         parport_put_port(p);
 350
 351 out_free_ops:
 352         kfree(ops);
 353
 354 out_unmap:
 355         sbus_iounmap(base, size);
 356
 357         return err;
 358 }
 359
 360 static int __devinit bpp_probe(struct of_device *dev, const struct of_device_id *match)
 361 {
 362         struct sbus_dev *sdev = to_sbus_device(&dev->dev);
 363
 364         return init_one_port(sdev);
 365 }
 366
 367 static int __devexit bpp_remove(struct of_device *dev)
 368 {
 369         struct parport *p = dev_get_drvdata(&dev->dev);
 370         struct parport_operations *ops = p->ops;
 371
 372         parport_remove_port(p);
 373
 374         if (p->irq != PARPORT_IRQ_NONE) {
 375                 parport_sunbpp_disable_irq(p);
 376                 free_irq(p->irq, p);
 377         }
 378
 379         sbus_iounmap((void __iomem *) p->base, p->size);
 380         parport_put_port(p);
 381         kfree(ops);
 382
 383         dev_set_drvdata(&dev->dev, NULL);
 384
 385         return 0;
 386 }
 387
 388 static struct of_device_id bpp_match[] = {
 389         {
 390                 .name = "SUNW,bpp",
 391         },
 392         {},
 393 };
 394
 395 MODULE_DEVICE_TABLE(of, bpp_match);
 396
 397 static struct of_platform_driver bpp_sbus_driver = {
 398         .name           = "bpp",
 399         .match_table    = bpp_match,
 400         .probe          = bpp_probe,
 401         .remove         = __devexit_p(bpp_remove),
 402 };
 403
 404 static int __init parport_sunbpp_init(void)
 405 {
 406         return of_register_driver(&bpp_sbus_driver, &sbus_bus_type);
 407 }
 408
 409 static void __exit parport_sunbpp_exit(void)
 410 {
 411         of_unregister_driver(&bpp_sbus_driver);
 412 }
 413
 414 MODULE_AUTHOR("Derrick J Brashear");
 415 MODULE_DESCRIPTION("Parport Driver for Sparc bidirectional Port");
 416 MODULE_SUPPORTED_DEVICE("Sparc Bidirectional Parallel Port");
 417 MODULE_VERSION("2.0");
 418 MODULE_LICENSE("GPL");
 419
 420 module_init(parport_sunbpp_init)
 421 module_exit(parport_sunbpp_exit)