drivers/parport/parport_ax88796.c

   1 /* linux/drivers/parport/parport_ax88796.c
   2  *
   3  * (c) 2005,2006 Simtec Electronics
   4  *      Ben Dooks <ben@simtec.co.uk>
   5  *
   6  * This program is free software; you can redistribute it and/or modify
   7  * it under the terms of the GNU General Public License version 2 as
   8  * published by the Free Software Foundation.
   9  *
  10 */
  11
  12 #include <linux/module.h>
  13 #include <linux/kernel.h>
  14 #include <linux/parport.h>
  15 #include <linux/interrupt.h>
  16 #include <linux/errno.h>
  17 #include <linux/platform_device.h>
  18
  19 #include <asm/io.h>
  20 #include <asm/irq.h>
  21
  22 #define AX_SPR_BUSY             (1<<7)
  23 #define AX_SPR_ACK              (1<<6)
  24 #define AX_SPR_PE               (1<<5)
  25 #define AX_SPR_SLCT             (1<<4)
  26 #define AX_SPR_ERR              (1<<3)
  27
  28 #define AX_CPR_nDOE             (1<<5)
  29 #define AX_CPR_SLCTIN           (1<<3)
  30 #define AX_CPR_nINIT            (1<<2)
  31 #define AX_CPR_ATFD             (1<<1)
  32 #define AX_CPR_STRB             (1<<0)
  33
  34 struct ax_drvdata {
  35         struct parport          *parport;
  36         struct parport_state     suspend;
  37
  38         struct device           *dev;
  39         struct resource         *io;
  40
  41         unsigned char            irq_enabled;
  42
  43         void __iomem            *base;
  44         void __iomem            *spp_data;
  45         void __iomem            *spp_spr;
  46         void __iomem            *spp_cpr;
  47 };
  48
  49 static inline struct ax_drvdata *pp_to_drv(struct parport *p)
  50 {
  51         return p->private_data;
  52 }
  53
  54 static unsigned char
  55 parport_ax88796_read_data(struct parport *p)
  56 {
  57         struct ax_drvdata *dd = pp_to_drv(p);
  58
  59         return readb(dd->spp_data);
  60 }
  61
  62 static void
  63 parport_ax88796_write_data(struct parport *p, unsigned char data)
  64 {
  65         struct ax_drvdata *dd = pp_to_drv(p);
  66
  67         writeb(data, dd->spp_data);
  68 }
  69
  70 static unsigned char
  71 parport_ax88796_read_control(struct parport *p)
  72 {
  73         struct ax_drvdata *dd = pp_to_drv(p);
  74         unsigned int cpr = readb(dd->spp_cpr);
  75         unsigned int ret = 0;
  76
  77         if (!(cpr & AX_CPR_STRB))
  78                 ret |= PARPORT_CONTROL_STROBE;
  79
  80         if (!(cpr & AX_CPR_ATFD))
  81                 ret |= PARPORT_CONTROL_AUTOFD;
  82
  83         if (cpr & AX_CPR_nINIT)
  84                 ret |= PARPORT_CONTROL_INIT;
  85
  86         if (!(cpr & AX_CPR_SLCTIN))
  87                 ret |= PARPORT_CONTROL_SELECT;
  88
  89         return ret;
  90 }
  91
  92 static void
  93 parport_ax88796_write_control(struct parport *p, unsigned char control)
  94 {
  95         struct ax_drvdata *dd = pp_to_drv(p);
  96         unsigned int cpr = readb(dd->spp_cpr);
  97
  98         cpr &= AX_CPR_nDOE;
  99
 100         if (!(control & PARPORT_CONTROL_STROBE))
 101                 cpr |= AX_CPR_STRB;
 102
 103         if (!(control & PARPORT_CONTROL_AUTOFD))
 104                 cpr |= AX_CPR_ATFD;
 105
 106         if (control & PARPORT_CONTROL_INIT)
 107                 cpr |= AX_CPR_nINIT;
 108
 109         if (!(control & PARPORT_CONTROL_SELECT))
 110                 cpr |= AX_CPR_SLCTIN;
 111
 112         dev_dbg(dd->dev, "write_control: ctrl=%02x, cpr=%02x\n", control, cpr);
 113         writeb(cpr, dd->spp_cpr);
 114
 115         if (parport_ax88796_read_control(p) != control) {
 116                 dev_err(dd->dev, "write_control: read != set (%02x, %02x)\n",
 117                         parport_ax88796_read_control(p), control);
 118         }
 119 }
 120
 121 static unsigned char
 122 parport_ax88796_read_status(struct parport *p)
 123 {
 124         struct ax_drvdata *dd = pp_to_drv(p);
 125         unsigned int status = readb(dd->spp_spr);
 126         unsigned int ret = 0;
 127
 128         if (status & AX_SPR_BUSY)
 129                 ret |= PARPORT_STATUS_BUSY;
 130
 131         if (status & AX_SPR_ACK)
 132                 ret |= PARPORT_STATUS_ACK;
 133
 134         if (status & AX_SPR_ERR)
 135                 ret |= PARPORT_STATUS_ERROR;
 136
 137         if (status & AX_SPR_SLCT)
 138                 ret |= PARPORT_STATUS_SELECT;
 139
 140         if (status & AX_SPR_PE)
 141                 ret |= PARPORT_STATUS_PAPEROUT;
 142
 143         return ret;
 144 }
 145
 146 static unsigned char
 147 parport_ax88796_frob_control(struct parport *p, unsigned char mask,
 148                              unsigned char val)
 149 {
 150         struct ax_drvdata *dd = pp_to_drv(p);
 151         unsigned char old = parport_ax88796_read_control(p);
 152
 153         dev_dbg(dd->dev, "frob: mask=%02x, val=%02x, old=%02x\n",
 154                 mask, val, old);
 155
 156         parport_ax88796_write_control(p, (old & ~mask) | val);
 157         return old;
 158 }
 159
 160 static void
 161 parport_ax88796_enable_irq(struct parport *p)
 162 {
 163         struct ax_drvdata *dd = pp_to_drv(p);
 164         unsigned long flags;
 165
 166         local_irq_save(flags);
 167         if (!dd->irq_enabled) {
 168                 enable_irq(p->irq);
 169                 dd->irq_enabled = 1;
 170         }
 171         local_irq_restore(flags);
 172 }
 173
 174 static void
 175 parport_ax88796_disable_irq(struct parport *p)
 176 {
 177         struct ax_drvdata *dd = pp_to_drv(p);
 178         unsigned long flags;
 179
 180         local_irq_save(flags);
 181         if (dd->irq_enabled) {
 182                 disable_irq(p->irq);
 183                 dd->irq_enabled = 0;
 184         }
 185         local_irq_restore(flags);
 186 }
 187
 188 static void
 189 parport_ax88796_data_forward(struct parport *p)
 190 {
 191         struct ax_drvdata *dd = pp_to_drv(p);
 192         void __iomem *cpr = dd->spp_cpr;
 193
 194         writeb((readb(cpr) & ~AX_CPR_nDOE), cpr);
 195 }
 196
 197 static void
 198 parport_ax88796_data_reverse(struct parport *p)
 199 {
 200         struct ax_drvdata *dd = pp_to_drv(p);
 201         void __iomem *cpr = dd->spp_cpr;
 202
 203         writeb(readb(cpr) | AX_CPR_nDOE, cpr);
 204 }
 205
 206 static void
 207 parport_ax88796_init_state(struct pardevice *d, struct parport_state *s)
 208 {
 209         struct ax_drvdata *dd = pp_to_drv(d->port);
 210
 211         memset(s, 0, sizeof(struct parport_state));
 212
 213         dev_dbg(dd->dev, "init_state: %p: state=%p\n", d, s);
 214         s->u.ax88796.cpr = readb(dd->spp_cpr);
 215 }
 216
 217 static void
 218 parport_ax88796_save_state(struct parport *p, struct parport_state *s)
 219 {
 220         struct ax_drvdata *dd = pp_to_drv(p);
 221
 222         dev_dbg(dd->dev, "save_state: %p: state=%p\n", p, s);
 223         s->u.ax88796.cpr = readb(dd->spp_cpr);
 224 }
 225
 226 static void
 227 parport_ax88796_restore_state(struct parport *p, struct parport_state *s)
 228 {
 229         struct ax_drvdata *dd = pp_to_drv(p);
 230
 231         dev_dbg(dd->dev, "restore_state: %p: state=%p\n", p, s);
 232         writeb(s->u.ax88796.cpr, dd->spp_cpr);
 233 }
 234
 235 static irqreturn_t
 236 parport_ax88796_interrupt(int irq, void *dev_id, struct pt_regs *regs)
 237 {
 238         parport_generic_irq(irq, dev_id, regs);
 239         return IRQ_HANDLED;
 240 }
 241
 242
 243 static struct parport_operations parport_ax88796_ops = {
 244         .write_data     = parport_ax88796_write_data,
 245         .read_data      = parport_ax88796_read_data,
 246
 247         .write_control  = parport_ax88796_write_control,
 248         .read_control   = parport_ax88796_read_control,
 249         .frob_control   = parport_ax88796_frob_control,
 250
 251         .read_status    = parport_ax88796_read_status,
 252
 253         .enable_irq     = parport_ax88796_enable_irq,
 254         .disable_irq    = parport_ax88796_disable_irq,
 255
 256         .data_forward   = parport_ax88796_data_forward,
 257         .data_reverse   = parport_ax88796_data_reverse,
 258
 259         .init_state     = parport_ax88796_init_state,
 260         .save_state     = parport_ax88796_save_state,
 261         .restore_state  = parport_ax88796_restore_state,
 262
 263         .epp_write_data = parport_ieee1284_epp_write_data,
 264         .epp_read_data  = parport_ieee1284_epp_read_data,
 265         .epp_write_addr = parport_ieee1284_epp_write_addr,
 266         .epp_read_addr  = parport_ieee1284_epp_read_addr,
 267
 268         .ecp_write_data = parport_ieee1284_ecp_write_data,
 269         .ecp_read_data  = parport_ieee1284_ecp_read_data,
 270         .ecp_write_addr = parport_ieee1284_ecp_write_addr,
 271
 272         .compat_write_data      = parport_ieee1284_write_compat,
 273         .nibble_read_data       = parport_ieee1284_read_nibble,
 274         .byte_read_data         = parport_ieee1284_read_byte,
 275
 276         .owner          = THIS_MODULE,
 277 };
 278
 279 static int parport_ax88796_probe(struct platform_device *pdev)
 280 {
 281         struct device *_dev = &pdev->dev;
 282         struct ax_drvdata *dd;
 283         struct parport *pp = NULL;
 284         struct resource *res;
 285         unsigned long size;
 286         int spacing;
 287         int irq;
 288         int ret;
 289
 290         dd = kzalloc(sizeof(struct ax_drvdata), GFP_KERNEL);
 291         if (dd == NULL) {
 292                 dev_err(_dev, "no memory for private data\n");
 293                 return -ENOMEM;
 294         }
 295
 296         res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
 297         if (res == NULL) {
 298                 dev_err(_dev, "no MEM specified\n");
 299                 ret = -ENXIO;
 300                 goto exit_mem;
 301         }
 302
 303         size = (res->end - res->start) + 1;
 304         spacing = size / 3;
 305
 306         dd->io = request_mem_region(res->start, size, pdev->name);
 307         if (dd->io == NULL) {
 308                 dev_err(_dev, "cannot reserve memory\n");
 309                 ret = -ENXIO;
 310                 goto exit_mem;
 311         }
 312
 313         dd->base = ioremap(res->start, size);
 314         if (dd->base == NULL) {
 315                 dev_err(_dev, "cannot ioremap region\n");
 316                 ret = -ENXIO;
 317                 goto exit_res;
 318         }
 319
 320         irq = platform_get_irq(pdev, 0);
 321         if (irq <= 0)
 322                 irq = PARPORT_IRQ_NONE;
 323
 324         pp = parport_register_port((unsigned long)dd->base, irq,
 325                                    PARPORT_DMA_NONE,
 326                                    &parport_ax88796_ops);
 327
 328         if (pp == NULL) {
 329                 dev_err(_dev, "failed to register parallel port\n");
 330                 ret = -ENOMEM;
 331                 goto exit_unmap;
 332         }
 333
 334         pp->private_data = dd;
 335         dd->parport = pp;
 336         dd->dev = _dev;
 337
 338         dd->spp_data = dd->base;
 339         dd->spp_spr  = dd->base + (spacing * 1);
 340         dd->spp_cpr  = dd->base + (spacing * 2);
 341
 342         /* initialise the port controls */
 343         writeb(AX_CPR_STRB, dd->spp_cpr);
 344
 345         if (irq >= 0) {
 346                 /* request irq */
 347                 ret = request_irq(irq, parport_ax88796_interrupt,
 348                                   IRQF_TRIGGER_FALLING, pdev->name, pp);
 349
 350                 if (ret < 0)
 351                         goto exit_port;
 352
 353                 dd->irq_enabled = 1;
 354         }
 355
 356         platform_set_drvdata(pdev, pp);
 357
 358         dev_info(_dev, "attached parallel port driver\n");
 359         parport_announce_port(pp);
 360
 361         return 0;
 362
 363  exit_port:
 364         parport_remove_port(pp);
 365  exit_unmap:
 366         iounmap(dd->base);
 367  exit_res:
 368         release_resource(dd->io);
 369         kfree(dd->io);
 370  exit_mem:
 371         kfree(dd);
 372         return ret;
 373 }
 374
 375 static int parport_ax88796_remove(struct platform_device *pdev)
 376 {
 377         struct parport *p = platform_get_drvdata(pdev);
 378         struct ax_drvdata *dd = pp_to_drv(p);
 379
 380         free_irq(p->irq, p);
 381         parport_remove_port(p);
 382         iounmap(dd->base);
 383         release_resource(dd->io);
 384         kfree(dd->io);
 385         kfree(dd);
 386
 387         return 0;
 388 }
 389
 390 #ifdef CONFIG_PM
 391
 392 static int parport_ax88796_suspend(struct platform_device *dev,
 393                                    pm_message_t state)
 394 {
 395         struct parport *p = platform_get_drvdata(dev);
 396         struct ax_drvdata *dd = pp_to_drv(p);
 397
 398         parport_ax88796_save_state(p, &dd->suspend);
 399         writeb(AX_CPR_nDOE | AX_CPR_STRB, dd->spp_cpr);
 400         return 0;
 401 }
 402
 403 static int parport_ax88796_resume(struct platform_device *dev)
 404 {
 405         struct parport *p = platform_get_drvdata(dev);
 406         struct ax_drvdata *dd = pp_to_drv(p);
 407
 408         parport_ax88796_restore_state(p, &dd->suspend);
 409         return 0;
 410 }
 411
 412 #else
 413 #define parport_ax88796_suspend NULL
 414 #define parport_ax88796_resume  NULL
 415 #endif
 416
 417 static struct platform_driver axdrv = {
 418         .driver         = {
 419                 .name   = "ax88796-pp",
 420                 .owner  = THIS_MODULE,
 421         },
 422         .probe          = parport_ax88796_probe,
 423         .remove         = parport_ax88796_remove,
 424         .suspend        = parport_ax88796_suspend,
 425         .resume         = parport_ax88796_resume,
 426 };
 427
 428 static int __init parport_ax88796_init(void)
 429 {
 430         return platform_driver_register(&axdrv);
 431 }
 432
 433 static void __exit parport_ax88796_exit(void)
 434 {
 435         platform_driver_unregister(&axdrv);
 436 }
 437
 438 module_init(parport_ax88796_init)
 439 module_exit(parport_ax88796_exit)
 440
 441 MODULE_AUTHOR("Ben Dooks <ben@simtec.co.uk>");
 442 MODULE_DESCRIPTION("AX88796 Parport parallel port driver");
 443 MODULE_LICENSE("GPL");