target/linux/au1000-2.6/patches/010-au100_gpio_i2c.patch

   1 diff -urN linux-2.6.19/drivers/i2c/busses/Kconfig linux-2.6.19.new/drivers/i2c/busses/Kconfig
   2 --- linux-2.6.19/drivers/i2c/busses/Kconfig     2006-11-29 22:57:37.000000000 +0100
   3 +++ linux-2.6.19.new/drivers/i2c/busses/Kconfig 2006-12-28 17:04:34.000000000 +0100
   4 @@ -84,6 +84,16 @@
   5           This driver can also be built as a module.  If so, the module
   6           will be called i2c-au1550.
   7
   8 +config I2C_AU1X00GPIO
   9 +       tristate "Au1x00 i2c using GPIO pins"
  10 +       depends on I2C && MTX1
  11 +       help
  12 +         If you say yest to this option, support will be included for the
  13 +         Au1x00 GPIO interface.
  14 +
  15 +         This driver can also be built as a module. If so, the module
  16 +         will be called i2c-au1x00gpio.
  17 +
  18  config I2C_ELEKTOR
  19         tristate "Elektor ISA card"
  20         depends on I2C && ISA && BROKEN_ON_SMP
  21 diff -urN linux-2.6.19/drivers/i2c/busses/Makefile linux-2.6.19.new/drivers/i2c/busses/Makefile
  22 --- linux-2.6.19/drivers/i2c/busses/Makefile    2006-11-29 22:57:37.000000000 +0100
  23 +++ linux-2.6.19.new/drivers/i2c/busses/Makefile        2006-12-28 03:07:37.000000000 +0100
  24 @@ -9,6 +9,7 @@
  25  obj-$(CONFIG_I2C_AMD756_S4882) += i2c-amd756-s4882.o
  26  obj-$(CONFIG_I2C_AMD8111)      += i2c-amd8111.o
  27  obj-$(CONFIG_I2C_AU1550)       += i2c-au1550.o
  28 +obj-$(CONFIG_I2C_AU1X00GPIO)   += i2c-au1x00gpio.o
  29  obj-$(CONFIG_I2C_ELEKTOR)      += i2c-elektor.o
  30  obj-$(CONFIG_I2C_HYDRA)                += i2c-hydra.o
  31  obj-$(CONFIG_I2C_I801)         += i2c-i801.o
  32 diff -urN linux-2.6.19/drivers/i2c/busses/i2c-au1x00gpio.c linux-2.6.19.new/drivers/i2c/busses/i2c-au1x00gpio.c
  33 --- linux-2.6.19/drivers/i2c/busses/i2c-au1x00gpio.c    1970-01-01 01:00:00.000000000 +0100
  34 +++ linux-2.6.19.new/drivers/i2c/busses/i2c-au1x00gpio.c        2006-12-28 17:02:10.000000000 +0100
  35 @@ -0,0 +1,421 @@
  36 +/* ------------------------------------------------------------------------- */
  37 +/* i2c-au1x00gpio.c i2c-hw access for Au1x00 GPIO pins.                      */
  38 +/* ------------------------------------------------------------------------- */
  39 +/*   Copyright (C) 1995-2000 Michael Stickel
  40 +
  41 +    This program is free software; you can redistribute it and/or modify
  42 +    it under the terms of the GNU General Public License as published by
  43 +    the Free Software Foundation; either version 2 of the License, or
  44 +    (at your option) any later version.
  45 +
  46 +    This program is distributed in the hope that it will be useful,
  47 +    but WITHOUT ANY WARRANTY; without even the implied warranty of
  48 +    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  49 +    GNU General Public License for more details.
  50 +
  51 +    You should have received a copy of the GNU General Public License
  52 +    along with this program; if not, write to the Free Software
  53 +    Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.               */
  54 +/* ------------------------------------------------------------------------- */
  55 +
  56 +/* With some changes from Ky�stialkki <kmalkki@cc.hut.fi> and even
  57 +   Frodo Looijaard <frodol@dds.nl>
  58 +   Simon G. Vogl
  59 +*/
  60 +
  61 +/* $Id: i2c-au1x00gpio.c,v 1.1.1.2 2004/01/22 15:35:47 br1 Exp $ */
  62 +
  63 +#include <linux/module.h>
  64 +#include <linux/types.h>
  65 +#include <linux/kernel.h>
  66 +#include <linux/init.h>
  67 +#include <linux/stddef.h>
  68 +#include <linux/ioport.h>
  69 +#include <asm/uaccess.h>
  70 +#include <asm/io.h>
  71 +#include <asm-mips/mach-au1x00/au1000.h>
  72 +#include <asm-mips/mach-au1x00/au1000_gpio.h>
  73 +
  74 +#include <linux/slab.h>
  75 +#include <linux/mm.h>
  76 +
  77 +#include <linux/i2c.h>
  78 +#include <linux/i2c-algo-bit.h>
  79 +
  80 +#ifndef __exit
  81 +#define __exit __init
  82 +#endif
  83 +
  84 +
  85 +struct i2c_au1x00gpio
  86 +{
  87 +       struct i2c_au1x00gpio *next;
  88 +
  89 +       short  scl_gpio;
  90 +       short  sda_gpio;
  91 +
  92 +       unsigned long scl_mask;
  93 +       unsigned long sda_mask;
  94 +
  95 +       struct i2c_adapter adapter;
  96 +       struct i2c_algo_bit_data bit_au1x00gpio_data;
  97 +};
  98 +
  99 +static struct i2c_au1x00gpio *adapter_list;
 100 +
 101 +
 102 +
 103 +/* ----- global defines -----------------------------------------------        */
 104 +#define DEB(x)         /* should be reasonable open, close &c.         */
 105 +#define DEB2(x)        /* low level debugging - very slow              */
 106 +#define DEBE(x)        x       /* error messages                               */
 107 +
 108 +/* ----- printer port defines ------------------------------------------*/
 109 +
 110 +/* ----- local functions ----------------------------------------------        */
 111 +
 112 +
 113 +//-- Primary GPIO
 114 +static void bit_au1x00gpio_setscl(void *data, int state)
 115 +{
 116 +  struct i2c_au1x00gpio * adapter = (struct i2c_au1x00gpio *)data;
 117 +  if (state)
 118 +    au_writel(adapter->scl_mask, SYS_TRIOUTCLR); // Disable Driver: Switch off Transistor => 1
 119 +  else
 120 +    au_writel(adapter->scl_mask, SYS_OUTPUTCLR); // Clear Output and switch on Transistor => 0
 121 +}
 122 +
 123 +
 124 +static void bit_au1x00gpio_setsda(void *data, int state)
 125 +{
 126 +  struct i2c_au1x00gpio * adapter = (struct i2c_au1x00gpio *)data;
 127 +  if (state)
 128 +    au_writel(adapter->sda_mask, SYS_TRIOUTCLR);
 129 +  else
 130 +    au_writel(adapter->sda_mask, SYS_OUTPUTCLR);
 131 +}
 132 +
 133 +
 134 +static int bit_au1x00gpio_getscl(void *data)
 135 +{
 136 +  struct i2c_au1x00gpio * adapter = (struct i2c_au1x00gpio *)data;
 137 +  return (au_readl(SYS_PINSTATERD) & adapter->scl_mask) ? 1 : 0;
 138 +}
 139 +
 140 +
 141 +static int bit_au1x00gpio_getsda(void *data)
 142 +{
 143 +  struct i2c_au1x00gpio * adapter = (struct i2c_au1x00gpio *)data;
 144 +  return (au_readl(SYS_PINSTATERD) & adapter->sda_mask) ? 1 : 0;
 145 +}
 146 +
 147 +
 148 +
 149 +
 150 +/*--
 151 + *-- Functions for accessing GPIO-2
 152 + *--
 153 + */
 154 +static void bit_au1x00gpio2_setscl(void *data, int state)
 155 +{
 156 +  struct i2c_au1x00gpio * adapter = (struct i2c_au1x00gpio *)data;
 157 +  if (state)
 158 +    {
 159 +      au_writel(au_readl(GPIO2_DIR) & ~adapter->scl_mask, GPIO2_DIR);
 160 +    }
 161 +  else
 162 +    {
 163 +      au_writel(au_readl(GPIO2_OUTPUT) & ~adapter->scl_mask, GPIO2_OUTPUT);
 164 +      au_writel(au_readl(GPIO2_DIR) | adapter->scl_mask, GPIO2_DIR);
 165 +    }
 166 +}
 167 +
 168 +static void bit_au1x00gpio2_setsda(void *data, int state)
 169 +{
 170 +  struct i2c_au1x00gpio * adapter = (struct i2c_au1x00gpio *)data;
 171 +  if (state)
 172 +    {
 173 +      au_writel(au_readl(GPIO2_DIR) & ~adapter->sda_mask, GPIO2_DIR);
 174 +    }
 175 +  else
 176 +    {
 177 +      au_writel(au_readl(GPIO2_OUTPUT) & ~adapter->sda_mask, GPIO2_OUTPUT);
 178 +      au_writel(au_readl(GPIO2_DIR) | adapter->sda_mask, GPIO2_DIR);
 179 +    }
 180 +}
 181 +
 182 +static int bit_au1x00gpio2_getscl(void *data)
 183 +{
 184 +  struct i2c_au1x00gpio * adapter = (struct i2c_au1x00gpio *)data;
 185 +  return (au_readl(GPIO2_PINSTATE) & adapter->scl_mask) ? 1 : 0;
 186 +}
 187 +
 188 +static int bit_au1x00gpio2_getsda(void *data)
 189 +{
 190 +  struct i2c_au1x00gpio * adapter = (struct i2c_au1x00gpio *)data;
 191 +  return (au_readl(GPIO2_PINSTATE) & adapter->sda_mask) ? 1 : 0;
 192 +}
 193 +
 194 +
 195 +
 196 +static int check_i2c_au1x00gpio_adapter(struct i2c_au1x00gpio *adapter)
 197 +{
 198 +  int state = 0;
 199 +
 200 +  adapter->bit_au1x00gpio_data.setsda (adapter, 1);
 201 +  adapter->bit_au1x00gpio_data.setscl (adapter, 1);
 202 +
 203 +  if (adapter->bit_au1x00gpio_data.getsda(adapter)==0)
 204 +    {
 205 +      printk ("i2c-au1x00gpio: sda line should read 1 but reads 0\n");
 206 +      state = -1;
 207 +    }
 208 +  if (adapter->bit_au1x00gpio_data.getscl(adapter)==0)
 209 +    {
 210 +      printk ("i2c-au1x00gpio: scl line should read 1 but reads 0\n");
 211 +      state = -1;
 212 +    }
 213 +
 214 +
 215 +  adapter->bit_au1x00gpio_data.setsda (adapter, 0);
 216 +  adapter->bit_au1x00gpio_data.setscl (adapter, 0);
 217 +
 218 +  if (adapter->bit_au1x00gpio_data.getsda(adapter)==1)
 219 +    {
 220 +      printk ("i2c-au1x00gpio: sda line should read 0 but reads 1\n");
 221 +      state = -1;
 222 +    }
 223 +  if (adapter->bit_au1x00gpio_data.getscl(adapter)==1)
 224 +    {
 225 +      printk ("i2c-au1x00gpio: scl line should read 0 but reads 1\n");
 226 +      state = -1;
 227 +    }
 228 +
 229 +  if (state==0)
 230 +    printk ("i2c-au1x00gpio: adapter with scl=GPIO%d,sda=GPIO%d is working\n",
 231 +           adapter->scl_gpio, adapter->sda_gpio
 232 +           );
 233 +  return state;
 234 +}
 235 +
 236 +
 237 +
 238 +#if 0
 239 +static int bit_au1x00gpio_reg(struct i2c_client *client)
 240 +{
 241 +       return 0;
 242 +}
 243 +
 244 +static int bit_au1x00gpio_unreg(struct i2c_client *client)
 245 +{
 246 +       return 0;
 247 +}
 248 +
 249 +static void bit_au1x00gpio_inc_use(struct i2c_adapter *adap)
 250 +{
 251 +       MOD_INC_USE_COUNT;
 252 +}
 253 +
 254 +static void bit_au1x00gpio_dec_use(struct i2c_adapter *adap)
 255 +{
 256 +       MOD_DEC_USE_COUNT;
 257 +}
 258 +#endif
 259 +
 260 +
 261 +
 262 +static struct i2c_algo_bit_data bit_au1x00gpio_data = {
 263 +       .data = NULL,
 264 +       .setsda = bit_au1x00gpio_setsda,
 265 +       .setscl = bit_au1x00gpio_setscl,
 266 +       .getsda = bit_au1x00gpio_getsda,
 267 +       .getscl = bit_au1x00gpio_getscl,
 268 +       .udelay = 80,
 269 +       .timeout = HZ,
 270 +};
 271 +
 272 +
 273 +static struct i2c_adapter bit_au1x00gpio_ops = {
 274 +        .owner          = THIS_MODULE,
 275 +        .name           = "Au1x00 GPIO I2C adapter",
 276 +        .id             = I2C_HW_B_AU1x00GPIO,
 277 +};
 278 +
 279 +
 280 +
 281 +/*
 282 + * scl_gpio:
 283 + *   0..31 for primary GPIO's
 284 + *   200..215 for secondary GPIO's
 285 + *
 286 + * sda_gpio:
 287 + *   0..31 for primary GPIO's
 288 + *   200..215 for secondary GPIO's
 289 + *
 290 + * You can even mix primary and secondary GPIO's.
 291 + * E.g.:  i2c_au1x00gpio_create(4,206);
 292 + */
 293 +
 294 +static int i2c_au1x00gpio_create (int scl_gpio, int sda_gpio)
 295 +{
 296 +  if ((scl_gpio < 32 || (scl_gpio >= 200 && scl_gpio <= 215)) &&
 297 +      (scl_gpio < 32 || (scl_gpio >= 200 && scl_gpio <= 215)))
 298 +    {
 299 +       struct i2c_au1x00gpio *adapter = kmalloc(sizeof(struct i2c_au1x00gpio),
 300 +                                         GFP_KERNEL);
 301 +       if (!adapter) {
 302 +               printk(KERN_ERR "i2c-au1x00-gpio: Unable to malloc.\n");
 303 +               return -1;
 304 +       }
 305 +
 306 +       printk(KERN_DEBUG "i2c-au1x00-gpio.o: attaching to SCL=GPIO%d, SDA=GPIO%d\n",
 307 +              scl_gpio, sda_gpio);
 308 +
 309 +       memset (adapter, 0, sizeof(struct i2c_au1x00gpio));
 310 +
 311 +       adapter->adapter = bit_au1x00gpio_ops;
 312 +
 313 +       adapter->adapter.algo_data = &adapter->bit_au1x00gpio_data;
 314 +       adapter->bit_au1x00gpio_data = bit_au1x00gpio_data;
 315 +       adapter->bit_au1x00gpio_data.data = adapter;
 316 +
 317 +       adapter->bit_au1x00gpio_data.data = adapter;
 318 +
 319 +       adapter->scl_gpio = scl_gpio;
 320 +       adapter->sda_gpio = sda_gpio;
 321 +
 322 +        if (sda_gpio < 32)
 323 +          {
 324 +           adapter->bit_au1x00gpio_data.setsda = bit_au1x00gpio_setsda;
 325 +           adapter->bit_au1x00gpio_data.getsda = bit_au1x00gpio_getsda;
 326 +            adapter->sda_mask = 1<<sda_gpio;
 327 +          }
 328 +        else if (sda_gpio >= 200 && sda_gpio <= 215)
 329 +          {
 330 +           adapter->bit_au1x00gpio_data.setsda = bit_au1x00gpio2_setsda;
 331 +           adapter->bit_au1x00gpio_data.getsda = bit_au1x00gpio2_getsda;
 332 +            adapter->sda_mask = 1<<(sda_gpio-200);
 333 +          }
 334 +
 335 +
 336 +        if (scl_gpio < 32)
 337 +          {
 338 +           adapter->bit_au1x00gpio_data.setscl = bit_au1x00gpio_setscl;
 339 +           adapter->bit_au1x00gpio_data.getscl = bit_au1x00gpio_getscl;
 340 +            adapter->scl_mask = 1<<scl_gpio;
 341 +          }
 342 +        else if (scl_gpio >= 200 && scl_gpio <= 215)
 343 +          {
 344 +           adapter->bit_au1x00gpio_data.setscl = bit_au1x00gpio2_setscl;
 345 +           adapter->bit_au1x00gpio_data.getscl = bit_au1x00gpio2_getscl;
 346 +            adapter->scl_mask = 1<<(scl_gpio-200);
 347 +          }
 348 +
 349 +       au_writel(0L, SYS_PININPUTEN);
 350 +       if (check_i2c_au1x00gpio_adapter(adapter)==0)
 351 +         {
 352 +           adapter->bit_au1x00gpio_data.setsda (adapter, 1);
 353 +           adapter->bit_au1x00gpio_data.setscl (adapter, 1);
 354 +
 355 +           if (i2c_bit_add_bus(&adapter->adapter) < 0)
 356 +             {
 357 +               printk(KERN_ERR "i2c-au1x00-gpio: Unable to register with I2C.\n");
 358 +               kfree(adapter);
 359 +               return -1;              /* No good */
 360 +             }
 361 +
 362 +           adapter->next = adapter_list;
 363 +           adapter_list = adapter;
 364 +           return 0;
 365 +         }
 366 +    }
 367 +  else
 368 +    printk(KERN_ERR "i2c-au1x00-gpio: Invalid argument scl_gpio=%d, sda_gpio=%d.\n", scl_gpio, sda_gpio);
 369 +  return -1;
 370 +}
 371 +
 372 +
 373 +
 374 +static void i2c_au1x00gpio_delete (int scl_gpio, int sda_gpio)
 375 +{
 376 +       struct i2c_au1x00gpio *adapter, *prev = NULL;
 377 +
 378 +       for (adapter = adapter_list; adapter; adapter = adapter->next)
 379 +       {
 380 +               if (adapter->scl_gpio == scl_gpio &&
 381 +                   adapter->sda_gpio == sda_gpio)
 382 +               {
 383 +                       i2c_bit_del_bus(&adapter->adapter);
 384 +                       if (prev)
 385 +                               prev->next = adapter->next;
 386 +                       else
 387 +                               adapter_list = adapter->next;
 388 +                       kfree(adapter);
 389 +                       return;
 390 +               }
 391 +               prev = adapter;
 392 +       }
 393 +}
 394 +
 395 +
 396 +
 397 +
 398 +
 399 +#ifndef CONFIG_I2C_AU1X00GPIO_SCL
 400 +#define CONFIG_I2C_AU1X00GPIO_SCL (216)
 401 +#endif
 402 +
 403 +#ifndef CONFIG_I2C_AU1X00GPIO_SDA
 404 +#define CONFIG_I2C_AU1X00GPIO_SDA (217)
 405 +#endif
 406 +
 407 +static int au1x00gpiopin_scl = CONFIG_I2C_AU1X00GPIO_SCL;
 408 +static int au1x00gpiopin_sda = CONFIG_I2C_AU1X00GPIO_SDA;
 409 +
 410 +
 411 +
 412 +int __init i2c_bit_au1x00gpio_init(void)
 413 +{
 414 +  printk(KERN_INFO "i2c-au1x00gpio.o: i2c Au1x00 GPIO adapter module version\n");
 415 +
 416 +  if (i2c_au1x00gpio_create (au1x00gpiopin_scl, au1x00gpiopin_sda) == 0)
 417 +    {
 418 +      printk(KERN_INFO "i2c-au1x00gpio.o: registered I2C-Bus for GPIO%d,GPIO%d\n",
 419 +            au1x00gpiopin_scl, au1x00gpiopin_sda
 420 +            );
 421 +      return 0;
 422 +    }
 423 +  printk(KERN_INFO "i2c-au1x00gpio.o: failed to register I2C-Bus for GPIO%d,GPIO%d\n",
 424 +            au1x00gpiopin_scl, au1x00gpiopin_sda
 425 +        );
 426 +  return -1;
 427 +}
 428 +
 429 +
 430 +void __exit i2c_bit_au1x00gpio_exit(void)
 431 +{
 432 +  i2c_au1x00gpio_delete (au1x00gpiopin_scl, au1x00gpiopin_sda);
 433 +}
 434 +
 435 +module_param(au1x00gpiopin_scl, int, 0644);
 436 +MODULE_PARM_DESC(au1x00gpiopin_scl, "GPIO pin number used for SCL pin.");
 437 +
 438 +module_param(au1x00gpiopin_sda, int, 0644);
 439 +MODULE_PARM_DESC(au1x00gpiopin_sda, "GPIO pin number used for SDA pin.");
 440 +
 441 +MODULE_AUTHOR("Michael Stickel <michael@cubic.org>");
 442 +MODULE_DESCRIPTION("I2C-Bus adapter routines for Au1x00 GPIO adapter.");
 443 +MODULE_LICENSE("GPL");
 444 +
 445 +
 446 +#ifdef MODULE
 447 +int init_module(void)
 448 +{
 449 +       return i2c_bit_au1x00gpio_init();
 450 +}
 451 +
 452 +void cleanup_module(void)
 453 +{
 454 +       i2c_bit_au1x00gpio_exit();
 455 +}
 456 +#endif