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