linux/drivers/parport/parport_sunbpp.c
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   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
  50static 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
  60static 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
  70static 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
  78static 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
  85static 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
 108static 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
 129static unsigned char parport_sunbpp_read_control(struct parport *p)
 130{
 131        return control_sunbpp_to_pc(p);
 132}
 133
 134static 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
 180static 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
 190static unsigned char parport_sunbpp_read_status(struct parport *p)
 191{
 192        return status_sunbpp_to_pc(p);
 193}
 194
 195static 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
 205static 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
 215static 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
 221static 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
 226static 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
 231static 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
 268static 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                goto out_unmap;
 291
 292        dprintk(("register_port\n"));
 293        if (!(p = parport_register_port((unsigned long)base, irq, dma, ops)))
 294                goto out_free_ops;
 295
 296        p->size = size;
 297        p->dev = &op->dev;
 298
 299        if ((err = request_irq(p->irq, parport_irq_handler,
 300                               IRQF_SHARED, p->name, p)) != 0) {
 301                goto out_put_port;
 302        }
 303
 304        parport_sunbpp_enable_irq(p);
 305
 306        regs = (struct bpp_regs __iomem *)p->base;
 307
 308        value_tcr = sbus_readb(&regs->p_tcr);
 309        value_tcr &= ~P_TCR_DIR;
 310        sbus_writeb(value_tcr, &regs->p_tcr);
 311
 312        printk(KERN_INFO "%s: sunbpp at 0x%lx\n", p->name, p->base);
 313
 314        dev_set_drvdata(&op->dev, p);
 315
 316        parport_announce_port(p);
 317
 318        return 0;
 319
 320out_put_port:
 321        parport_put_port(p);
 322
 323out_free_ops:
 324        kfree(ops);
 325
 326out_unmap:
 327        of_iounmap(&op->resource[0], base, size);
 328
 329        return err;
 330}
 331
 332static int bpp_remove(struct platform_device *op)
 333{
 334        struct parport *p = dev_get_drvdata(&op->dev);
 335        struct parport_operations *ops = p->ops;
 336
 337        parport_remove_port(p);
 338
 339        if (p->irq != PARPORT_IRQ_NONE) {
 340                parport_sunbpp_disable_irq(p);
 341                free_irq(p->irq, p);
 342        }
 343
 344        of_iounmap(&op->resource[0], (void __iomem *) p->base, p->size);
 345        parport_put_port(p);
 346        kfree(ops);
 347
 348        dev_set_drvdata(&op->dev, NULL);
 349
 350        return 0;
 351}
 352
 353static const struct of_device_id bpp_match[] = {
 354        {
 355                .name = "SUNW,bpp",
 356        },
 357        {},
 358};
 359
 360MODULE_DEVICE_TABLE(of, bpp_match);
 361
 362static struct platform_driver bpp_sbus_driver = {
 363        .driver = {
 364                .name = "bpp",
 365                .owner = THIS_MODULE,
 366                .of_match_table = bpp_match,
 367        },
 368        .probe          = bpp_probe,
 369        .remove         = bpp_remove,
 370};
 371
 372module_platform_driver(bpp_sbus_driver);
 373
 374MODULE_AUTHOR("Derrick J Brashear");
 375MODULE_DESCRIPTION("Parport Driver for Sparc bidirectional Port");
 376MODULE_SUPPORTED_DEVICE("Sparc Bidirectional Parallel Port");
 377MODULE_VERSION("2.0");
 378MODULE_LICENSE("GPL");
 379
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