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 static unsigned char status_sunbpp_to_pc(struct parport *p)
  86 {
  87         struct bpp_regs __iomem *regs = (struct bpp_regs __iomem *)p->base;
  88         unsigned char bits = 0;
  89         unsigned char value_tcr = sbus_readb(&regs->p_tcr);
  90         unsigned char value_ir = sbus_readb(&regs->p_ir);
  91
  92         if (!(value_ir & P_IR_ERR))
  93                 bits |= PARPORT_STATUS_ERROR;
  94         if (!(value_ir & P_IR_SLCT))
  95                 bits |= PARPORT_STATUS_SELECT;
  96         if (!(value_ir & P_IR_PE))
  97                 bits |= PARPORT_STATUS_PAPEROUT;
  98         if (value_tcr & P_TCR_ACK)
  99                 bits |= PARPORT_STATUS_ACK;
 100         if (!(value_tcr & P_TCR_BUSY))
 101                 bits |= PARPORT_STATUS_BUSY;
 102
 103         dprintk((KERN_DEBUG "tcr 0x%x ir 0x%x\n", value_tcr, value_ir));
 104         dprintk((KERN_DEBUG "read status 0x%x\n", bits));
 105         return bits;
 106 }
 107
 108 static unsigned char control_sunbpp_to_pc(struct parport *p)
 109 {
 110         struct bpp_regs __iomem *regs = (struct bpp_regs __iomem *)p->base;
 111         unsigned char bits = 0;
 112         unsigned char value_tcr = sbus_readb(&regs->p_tcr);
 113         unsigned char value_or = sbus_readb(&regs->p_or);
 114
 115         if (!(value_tcr & P_TCR_DS))
 116                 bits |= PARPORT_CONTROL_STROBE;
 117         if (!(value_or & P_OR_AFXN))
 118                 bits |= PARPORT_CONTROL_AUTOFD;
 119         if (!(value_or & P_OR_INIT))
 120                 bits |= PARPORT_CONTROL_INIT;
 121         if (value_or & P_OR_SLCT_IN)
 122                 bits |= PARPORT_CONTROL_SELECT;
 123
 124         dprintk((KERN_DEBUG "tcr 0x%x or 0x%x\n", value_tcr, value_or));
 125         dprintk((KERN_DEBUG "read control 0x%x\n", bits));
 126         return bits;
 127 }
 128
 129 static unsigned char parport_sunbpp_read_control(struct parport *p)
 130 {
 131         return control_sunbpp_to_pc(p);
 132 }
 133
 134 static unsigned char parport_sunbpp_frob_control(struct parport *p,
 135                                                  unsigned char mask,
 136                                                  unsigned char val)
 137 {
 138         struct bpp_regs __iomem *regs = (struct bpp_regs __iomem *)p->base;
 139         unsigned char value_tcr = sbus_readb(&regs->p_tcr);
 140         unsigned char value_or = sbus_readb(&regs->p_or);
 141
 142         dprintk((KERN_DEBUG "frob1: tcr 0x%x or 0x%x\n",
 143                  value_tcr, value_or));
 144         if (mask & PARPORT_CONTROL_STROBE) {
 145                 if (val & PARPORT_CONTROL_STROBE) {
 146                         value_tcr &= ~P_TCR_DS;
 147                 } else {
 148                         value_tcr |= P_TCR_DS;
 149                 }
 150         }
 151         if (mask & PARPORT_CONTROL_AUTOFD) {
 152                 if (val & PARPORT_CONTROL_AUTOFD) {
 153                         value_or &= ~P_OR_AFXN;
 154                 } else {
 155                         value_or |= P_OR_AFXN;
 156                 }
 157         }
 158         if (mask & PARPORT_CONTROL_INIT) {
 159                 if (val & PARPORT_CONTROL_INIT) {
 160                         value_or &= ~P_OR_INIT;
 161                 } else {
 162                         value_or |= P_OR_INIT;
 163                 }
 164         }
 165         if (mask & PARPORT_CONTROL_SELECT) {
 166                 if (val & PARPORT_CONTROL_SELECT) {
 167                         value_or |= P_OR_SLCT_IN;
 168                 } else {
 169                         value_or &= ~P_OR_SLCT_IN;
 170                 }
 171         }
 172
 173         sbus_writeb(value_or, &regs->p_or);
 174         sbus_writeb(value_tcr, &regs->p_tcr);
 175         dprintk((KERN_DEBUG "frob2: tcr 0x%x or 0x%x\n",
 176                  value_tcr, value_or));
 177         return parport_sunbpp_read_control(p);
 178 }
 179
 180 static void parport_sunbpp_write_control(struct parport *p, unsigned char d)
 181 {
 182         const unsigned char wm = (PARPORT_CONTROL_STROBE |
 183                                   PARPORT_CONTROL_AUTOFD |
 184                                   PARPORT_CONTROL_INIT |
 185                                   PARPORT_CONTROL_SELECT);
 186
 187         parport_sunbpp_frob_control (p, wm, d & wm);
 188 }
 189
 190 static unsigned char parport_sunbpp_read_status(struct parport *p)
 191 {
 192         return status_sunbpp_to_pc(p);
 193 }
 194
 195 static void parport_sunbpp_data_forward (struct parport *p)
 196 {
 197         struct bpp_regs __iomem *regs = (struct bpp_regs __iomem *)p->base;
 198         unsigned char value_tcr = sbus_readb(&regs->p_tcr);
 199
 200         dprintk((KERN_DEBUG "forward\n"));
 201         value_tcr &= ~P_TCR_DIR;
 202         sbus_writeb(value_tcr, &regs->p_tcr);
 203 }
 204
 205 static void parport_sunbpp_data_reverse (struct parport *p)
 206 {
 207         struct bpp_regs __iomem *regs = (struct bpp_regs __iomem *)p->base;
 208         u8 val = sbus_readb(&regs->p_tcr);
 209
 210         dprintk((KERN_DEBUG "reverse\n"));
 211         val |= P_TCR_DIR;
 212         sbus_writeb(val, &regs->p_tcr);
 213 }
 214
 215 static void parport_sunbpp_init_state(struct pardevice *dev, struct parport_state *s)
 216 {
 217         s->u.pc.ctr = 0xc;
 218         s->u.pc.ecr = 0x0;
 219 }
 220
 221 static void parport_sunbpp_save_state(struct parport *p, struct parport_state *s)
 222 {
 223         s->u.pc.ctr = parport_sunbpp_read_control(p);
 224 }
 225
 226 static void parport_sunbpp_restore_state(struct parport *p, struct parport_state *s)
 227 {
 228         parport_sunbpp_write_control(p, s->u.pc.ctr);
 229 }
 230
 231 static struct parport_operations parport_sunbpp_ops =
 232 {
 233         .write_data     = parport_sunbpp_write_data,
 234         .read_data      = parport_sunbpp_read_data,
 235
 236         .write_control  = parport_sunbpp_write_control,
 237         .read_control   = parport_sunbpp_read_control,
 238         .frob_control   = parport_sunbpp_frob_control,
 239
 240         .read_status    = parport_sunbpp_read_status,
 241
 242         .enable_irq     = parport_sunbpp_enable_irq,
 243         .disable_irq    = parport_sunbpp_disable_irq,
 244
 245         .data_forward   = parport_sunbpp_data_forward,
 246         .data_reverse   = parport_sunbpp_data_reverse,
 247
 248         .init_state     = parport_sunbpp_init_state,
 249         .save_state     = parport_sunbpp_save_state,
 250         .restore_state  = parport_sunbpp_restore_state,
 251
 252         .epp_write_data = parport_ieee1284_epp_write_data,
 253         .epp_read_data  = parport_ieee1284_epp_read_data,
 254         .epp_write_addr = parport_ieee1284_epp_write_addr,
 255         .epp_read_addr  = parport_ieee1284_epp_read_addr,
 256
 257         .ecp_write_data = parport_ieee1284_ecp_write_data,
 258         .ecp_read_data  = parport_ieee1284_ecp_read_data,
 259         .ecp_write_addr = parport_ieee1284_ecp_write_addr,
 260
 261         .compat_write_data      = parport_ieee1284_write_compat,
 262         .nibble_read_data       = parport_ieee1284_read_nibble,
 263         .byte_read_data         = parport_ieee1284_read_byte,
 264
 265         .owner          = THIS_MODULE,
 266 };
 267
 268 static int bpp_probe(struct platform_device *op)
 269 {
 270         struct parport_operations *ops;
 271         struct bpp_regs __iomem *regs;
 272         int irq, dma, err = 0, size;
 273         unsigned char value_tcr;
 274         void __iomem *base;
 275         struct parport *p;
 276
 277         irq = op->archdata.irqs[0];
 278         base = of_ioremap(&op->resource[0], 0,
 279                           resource_size(&op->resource[0]),
 280                           "sunbpp");
 281         if (!base)
 282                 return -ENODEV;
 283
 284         size = resource_size(&op->resource[0]);
 285         dma = PARPORT_DMA_NONE;
 286
 287         ops = kmemdup(&parport_sunbpp_ops, sizeof(struct parport_operations),
 288                       GFP_KERNEL);
 289         if (!ops) {
 290                 err = -ENOMEM;
 291                 goto out_unmap;
 292         }
 293
 294         dprintk(("register_port\n"));
 295         if (!(p = parport_register_port((unsigned long)base, irq, dma, ops))) {
 296                 err = -ENOMEM;
 297                 goto out_free_ops;
 298         }
 299
 300         p->size = size;
 301         p->dev = &op->dev;
 302
 303         if ((err = request_irq(p->irq, parport_irq_handler,
 304                                IRQF_SHARED, p->name, p)) != 0) {
 305                 goto out_put_port;
 306         }
 307
 308         parport_sunbpp_enable_irq(p);
 309
 310         regs = (struct bpp_regs __iomem *)p->base;
 311
 312         value_tcr = sbus_readb(&regs->p_tcr);
 313         value_tcr &= ~P_TCR_DIR;
 314         sbus_writeb(value_tcr, &regs->p_tcr);
 315
 316         printk(KERN_INFO "%s: sunbpp at 0x%lx\n", p->name, p->base);
 317
 318         dev_set_drvdata(&op->dev, p);
 319
 320         parport_announce_port(p);
 321
 322         return 0;
 323
 324 out_put_port:
 325         parport_put_port(p);
 326
 327 out_free_ops:
 328         kfree(ops);
 329
 330 out_unmap:
 331         of_iounmap(&op->resource[0], base, size);
 332
 333         return err;
 334 }
 335
 336 static int bpp_remove(struct platform_device *op)
 337 {
 338         struct parport *p = dev_get_drvdata(&op->dev);
 339         struct parport_operations *ops = p->ops;
 340
 341         parport_remove_port(p);
 342
 343         if (p->irq != PARPORT_IRQ_NONE) {
 344                 parport_sunbpp_disable_irq(p);
 345                 free_irq(p->irq, p);
 346         }
 347
 348         of_iounmap(&op->resource[0], (void __iomem *) p->base, p->size);
 349         parport_put_port(p);
 350         kfree(ops);
 351
 352         dev_set_drvdata(&op->dev, NULL);
 353
 354         return 0;
 355 }
 356
 357 static const struct of_device_id bpp_match[] = {
 358         {
 359                 .name = "SUNW,bpp",
 360         },
 361         {},
 362 };
 363
 364 MODULE_DEVICE_TABLE(of, bpp_match);
 365
 366 static struct platform_driver bpp_sbus_driver = {
 367         .driver = {
 368                 .name = "bpp",
 369                 .of_match_table = bpp_match,
 370         },
 371         .probe          = bpp_probe,
 372         .remove         = bpp_remove,
 373 };
 374
 375 module_platform_driver(bpp_sbus_driver);
 376
 377 MODULE_AUTHOR("Derrick J Brashear");
 378 MODULE_DESCRIPTION("Parport Driver for Sparc bidirectional Port");
 379 MODULE_SUPPORTED_DEVICE("Sparc Bidirectional Parallel Port");
 380 MODULE_VERSION("2.0");
 381 MODULE_LICENSE("GPL");