drivers/gpio/gpio-sch.c

   1 /*
   2  * GPIO interface for Intel Poulsbo SCH
   3  *
   4  *  Copyright (c) 2010 CompuLab Ltd
   5  *  Author: Denis Turischev <denis@compulab.co.il>
   6  *
   7  *  This program is free software; you can redistribute it and/or modify
   8  *  it under the terms of the GNU General Public License 2 as published
   9  *  by the Free Software Foundation.
  10  *
  11  *  This program is distributed in the hope that it will be useful,
  12  *  but WITHOUT ANY WARRANTY; without even the implied warranty of
  13  *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14  *  GNU General Public License for more details.
  15  *
  16  *  You should have received a copy of the GNU General Public License
  17  *  along with this program; see the file COPYING.  If not, write to
  18  *  the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA.
  19  */
  20
  21 #include <linux/init.h>
  22 #include <linux/kernel.h>
  23 #include <linux/module.h>
  24 #include <linux/io.h>
  25 #include <linux/errno.h>
  26 #include <linux/acpi.h>
  27 #include <linux/platform_device.h>
  28 #include <linux/pci_ids.h>
  29
  30 #include <linux/gpio.h>
  31
  32 static DEFINE_SPINLOCK(gpio_lock);
  33
  34 #define CGEN    (0x00)
  35 #define CGIO    (0x04)
  36 #define CGLV    (0x08)
  37
  38 #define RGEN    (0x20)
  39 #define RGIO    (0x24)
  40 #define RGLV    (0x28)
  41
  42 static unsigned short gpio_ba;
  43
  44 static int sch_gpio_core_direction_in(struct gpio_chip *gc, unsigned  gpio_num)
  45 {
  46         u8 curr_dirs;
  47         unsigned short offset, bit;
  48
  49         spin_lock(&gpio_lock);
  50
  51         offset = CGIO + gpio_num / 8;
  52         bit = gpio_num % 8;
  53
  54         curr_dirs = inb(gpio_ba + offset);
  55
  56         if (!(curr_dirs & (1 << bit)))
  57                 outb(curr_dirs | (1 << bit), gpio_ba + offset);
  58
  59         spin_unlock(&gpio_lock);
  60         return 0;
  61 }
  62
  63 static int sch_gpio_core_get(struct gpio_chip *gc, unsigned gpio_num)
  64 {
  65         int res;
  66         unsigned short offset, bit;
  67
  68         offset = CGLV + gpio_num / 8;
  69         bit = gpio_num % 8;
  70
  71         res = !!(inb(gpio_ba + offset) & (1 << bit));
  72         return res;
  73 }
  74
  75 static void sch_gpio_core_set(struct gpio_chip *gc, unsigned gpio_num, int val)
  76 {
  77         u8 curr_vals;
  78         unsigned short offset, bit;
  79
  80         spin_lock(&gpio_lock);
  81
  82         offset = CGLV + gpio_num / 8;
  83         bit = gpio_num % 8;
  84
  85         curr_vals = inb(gpio_ba + offset);
  86
  87         if (val)
  88                 outb(curr_vals | (1 << bit), gpio_ba + offset);
  89         else
  90                 outb((curr_vals & ~(1 << bit)), gpio_ba + offset);
  91         spin_unlock(&gpio_lock);
  92 }
  93
  94 static int sch_gpio_core_direction_out(struct gpio_chip *gc,
  95                                         unsigned gpio_num, int val)
  96 {
  97         u8 curr_dirs;
  98         unsigned short offset, bit;
  99
 100         sch_gpio_core_set(gc, gpio_num, val);
 101
 102         spin_lock(&gpio_lock);
 103
 104         offset = CGIO + gpio_num / 8;
 105         bit = gpio_num % 8;
 106
 107         curr_dirs = inb(gpio_ba + offset);
 108         if (curr_dirs & (1 << bit))
 109                 outb(curr_dirs & ~(1 << bit), gpio_ba + offset);
 110
 111         spin_unlock(&gpio_lock);
 112         return 0;
 113 }
 114
 115 static struct gpio_chip sch_gpio_core = {
 116         .label                  = "sch_gpio_core",
 117         .owner                  = THIS_MODULE,
 118         .direction_input        = sch_gpio_core_direction_in,
 119         .get                    = sch_gpio_core_get,
 120         .direction_output       = sch_gpio_core_direction_out,
 121         .set                    = sch_gpio_core_set,
 122 };
 123
 124 static int sch_gpio_resume_direction_in(struct gpio_chip *gc,
 125                                         unsigned gpio_num)
 126 {
 127         u8 curr_dirs;
 128         unsigned short offset, bit;
 129
 130         spin_lock(&gpio_lock);
 131
 132         offset = RGIO + gpio_num / 8;
 133         bit = gpio_num % 8;
 134
 135         curr_dirs = inb(gpio_ba + offset);
 136
 137         if (!(curr_dirs & (1 << bit)))
 138                 outb(curr_dirs | (1 << bit), gpio_ba + offset);
 139
 140         spin_unlock(&gpio_lock);
 141         return 0;
 142 }
 143
 144 static int sch_gpio_resume_get(struct gpio_chip *gc, unsigned gpio_num)
 145 {
 146         unsigned short offset, bit;
 147
 148         offset = RGLV + gpio_num / 8;
 149         bit = gpio_num % 8;
 150
 151         return !!(inb(gpio_ba + offset) & (1 << bit));
 152 }
 153
 154 static void sch_gpio_resume_set(struct gpio_chip *gc,
 155                                 unsigned gpio_num, int val)
 156 {
 157         u8 curr_vals;
 158         unsigned short offset, bit;
 159
 160         spin_lock(&gpio_lock);
 161
 162         offset = RGLV + gpio_num / 8;
 163         bit = gpio_num % 8;
 164
 165         curr_vals = inb(gpio_ba + offset);
 166
 167         if (val)
 168                 outb(curr_vals | (1 << bit), gpio_ba + offset);
 169         else
 170                 outb((curr_vals & ~(1 << bit)), gpio_ba + offset);
 171
 172         spin_unlock(&gpio_lock);
 173 }
 174
 175 static int sch_gpio_resume_direction_out(struct gpio_chip *gc,
 176                                         unsigned gpio_num, int val)
 177 {
 178         u8 curr_dirs;
 179         unsigned short offset, bit;
 180
 181         sch_gpio_resume_set(gc, gpio_num, val);
 182
 183         offset = RGIO + gpio_num / 8;
 184         bit = gpio_num % 8;
 185
 186         spin_lock(&gpio_lock);
 187
 188         curr_dirs = inb(gpio_ba + offset);
 189         if (curr_dirs & (1 << bit))
 190                 outb(curr_dirs & ~(1 << bit), gpio_ba + offset);
 191
 192         spin_unlock(&gpio_lock);
 193         return 0;
 194 }
 195
 196 static struct gpio_chip sch_gpio_resume = {
 197         .label                  = "sch_gpio_resume",
 198         .owner                  = THIS_MODULE,
 199         .direction_input        = sch_gpio_resume_direction_in,
 200         .get                    = sch_gpio_resume_get,
 201         .direction_output       = sch_gpio_resume_direction_out,
 202         .set                    = sch_gpio_resume_set,
 203 };
 204
 205 static int sch_gpio_probe(struct platform_device *pdev)
 206 {
 207         struct resource *res;
 208         int err, id;
 209
 210         id = pdev->id;
 211         if (!id)
 212                 return -ENODEV;
 213
 214         res = platform_get_resource(pdev, IORESOURCE_IO, 0);
 215         if (!res)
 216                 return -EBUSY;
 217
 218         if (!request_region(res->start, resource_size(res), pdev->name))
 219                 return -EBUSY;
 220
 221         gpio_ba = res->start;
 222
 223         switch (id) {
 224         case PCI_DEVICE_ID_INTEL_SCH_LPC:
 225                 sch_gpio_core.base = 0;
 226                 sch_gpio_core.ngpio = 10;
 227                 sch_gpio_resume.base = 10;
 228                 sch_gpio_resume.ngpio = 4;
 229                 /*
 230                  * GPIO[6:0] enabled by default
 231                  * GPIO7 is configured by the CMC as SLPIOVR
 232                  * Enable GPIO[9:8] core powered gpios explicitly
 233                  */
 234                 outb(0x3, gpio_ba + CGEN + 1);
 235                 /*
 236                  * SUS_GPIO[2:0] enabled by default
 237                  * Enable SUS_GPIO3 resume powered gpio explicitly
 238                  */
 239                 outb(0x8, gpio_ba + RGEN);
 240                 break;
 241
 242         case PCI_DEVICE_ID_INTEL_ITC_LPC:
 243                 sch_gpio_core.base = 0;
 244                 sch_gpio_core.ngpio = 5;
 245                 sch_gpio_resume.base = 5;
 246                 sch_gpio_resume.ngpio = 9;
 247                 break;
 248
 249         case PCI_DEVICE_ID_INTEL_CENTERTON_ILB:
 250                 sch_gpio_core.base = 0;
 251                 sch_gpio_core.ngpio = 21;
 252                 sch_gpio_resume.base = 21;
 253                 sch_gpio_resume.ngpio = 9;
 254                 break;
 255
 256         default:
 257                 err = -ENODEV;
 258                 goto err_sch_gpio_core;
 259         }
 260
 261         sch_gpio_core.dev = &pdev->dev;
 262         sch_gpio_resume.dev = &pdev->dev;
 263
 264         err = gpiochip_add(&sch_gpio_core);
 265         if (err < 0)
 266                 goto err_sch_gpio_core;
 267
 268         err = gpiochip_add(&sch_gpio_resume);
 269         if (err < 0)
 270                 goto err_sch_gpio_resume;
 271
 272         return 0;
 273
 274 err_sch_gpio_resume:
 275         if (gpiochip_remove(&sch_gpio_core))
 276                 dev_err(&pdev->dev, "%s gpiochip_remove failed\n", __func__);
 277
 278 err_sch_gpio_core:
 279         release_region(res->start, resource_size(res));
 280         gpio_ba = 0;
 281
 282         return err;
 283 }
 284
 285 static int sch_gpio_remove(struct platform_device *pdev)
 286 {
 287         struct resource *res;
 288         if (gpio_ba) {
 289                 int err;
 290
 291                 err  = gpiochip_remove(&sch_gpio_core);
 292                 if (err)
 293                         dev_err(&pdev->dev, "%s failed, %d\n",
 294                                 "gpiochip_remove()", err);
 295                 err = gpiochip_remove(&sch_gpio_resume);
 296                 if (err)
 297                         dev_err(&pdev->dev, "%s failed, %d\n",
 298                                 "gpiochip_remove()", err);
 299
 300                 res = platform_get_resource(pdev, IORESOURCE_IO, 0);
 301
 302                 release_region(res->start, resource_size(res));
 303                 gpio_ba = 0;
 304
 305                 return err;
 306         }
 307
 308         return 0;
 309 }
 310
 311 static struct platform_driver sch_gpio_driver = {
 312         .driver = {
 313                 .name = "sch_gpio",
 314                 .owner = THIS_MODULE,
 315         },
 316         .probe          = sch_gpio_probe,
 317         .remove         = sch_gpio_remove,
 318 };
 319
 320 module_platform_driver(sch_gpio_driver);
 321
 322 MODULE_AUTHOR("Denis Turischev <denis@compulab.co.il>");
 323 MODULE_DESCRIPTION("GPIO interface for Intel Poulsbo SCH");
 324 MODULE_LICENSE("GPL");
 325 MODULE_ALIAS("platform:sch_gpio");