target/linux/ifxmips/files/arch/mips/ifxmips/gpio.c

   1 /*
   2  *   This program is free software; you can redistribute it and/or modify
   3  *   it under the terms of the GNU General Public License as published by
   4  *   the Free Software Foundation; either version 2 of the License, or
   5  *   (at your option) any later version.
   6  *
   7  *   This program is distributed in the hope that it will be useful,
   8  *   but WITHOUT ANY WARRANTY; without even the implied warranty of
   9  *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  10  *   GNU General Public License for more details.
  11  *
  12  *   You should have received a copy of the GNU General Public License
  13  *   along with this program; if not, write to the Free Software
  14  *   Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307, USA.
  15  *
  16  *   Copyright (C) 2004 btxu Generate from INCA-IP project
  17  *   Copyright (C) 2005 Jin-Sze.Sow Comments edited
  18  *   Copyright (C) 2006 Huang Xiaogang Modification & verification on Danube chip
  19  *   Copyright (C) 2007 John Crispin <blogic@openwrt.org>
  20  */
  21
  22 #include <linux/module.h>
  23 #include <linux/types.h>
  24 #include <linux/errno.h>
  25 #include <linux/proc_fs.h>
  26 #include <linux/init.h>
  27 #include <linux/ioctl.h>
  28 #include <linux/timer.h>
  29 #include <linux/module.h>
  30 #include <linux/timer.h>
  31 #include <linux/interrupt.h>
  32 #include <linux/kobject.h>
  33 #include <linux/workqueue.h>
  34 #include <linux/skbuff.h>
  35 #include <linux/netlink.h>
  36 #include <linux/platform_device.h>
  37 #include <net/sock.h>
  38 #include <asm/uaccess.h>
  39 #include <asm/semaphore.h>
  40 #include <asm/uaccess.h>
  41 #include <asm/ifxmips/ifxmips.h>
  42
  43 #define MAX_PORTS                       2
  44 #define PINS_PER_PORT           16
  45
  46 #ifdef CONFIG_IFXMIPS_GPIO_RST_BTN
  47
  48 unsigned int rst_port = 1;
  49 unsigned int rst_pin = 15;
  50 static struct timer_list rst_button_timer;
  51
  52 extern struct sock *uevent_sock;
  53 extern u64 uevent_next_seqnum(void);
  54 static unsigned long seen;
  55 static int pressed = 0;
  56
  57 struct event_t {
  58         struct work_struct wq;
  59         int set;
  60         unsigned long jiffies;
  61 };
  62 #endif
  63
  64 #define IFXMIPS_GPIO_SANITY             {if (port > MAX_PORTS || pin > PINS_PER_PORT) return -EINVAL; }
  65 int
  66 ifxmips_port_reserve_pin(unsigned int port, unsigned int pin)
  67 {
  68         IFXMIPS_GPIO_SANITY;
  69         printk("%s : call to obseleted function\n", __func__);
  70         return 0;
  71 }
  72 EXPORT_SYMBOL(ifxmips_port_reserve_pin);
  73
  74 int
  75 ifxmips_port_free_pin(unsigned int port, unsigned int pin)
  76 {
  77         IFXMIPS_GPIO_SANITY;
  78         printk("%s : call to obseleted function\n", __func__);
  79         return 0;
  80 }
  81 EXPORT_SYMBOL(ifxmips_port_free_pin);
  82
  83 int
  84 ifxmips_port_set_open_drain(unsigned int port, unsigned int pin)
  85 {
  86         IFXMIPS_GPIO_SANITY;
  87         ifxmips_w32(ifxmips_r32(IFXMIPS_GPIO_P0_OD + (port * 0xC)) | (1 << pin),
  88                 IFXMIPS_GPIO_P0_OD + (port * 0xC));
  89         return 0;
  90 }
  91 EXPORT_SYMBOL(ifxmips_port_set_open_drain);
  92
  93 int
  94 ifxmips_port_clear_open_drain(unsigned int port, unsigned int pin)
  95 {
  96         IFXMIPS_GPIO_SANITY;
  97         ifxmips_w32(ifxmips_r32(IFXMIPS_GPIO_P0_OD + (port * 0xC)) & ~(1 << pin),
  98                 IFXMIPS_GPIO_P0_OD + (port * 0xC));
  99         return 0;
 100 }
 101 EXPORT_SYMBOL(ifxmips_port_clear_open_drain);
 102
 103 int
 104 ifxmips_port_set_pudsel(unsigned int port, unsigned int pin)
 105 {
 106     IFXMIPS_GPIO_SANITY;
 107         ifxmips_w32(ifxmips_r32(IFXMIPS_GPIO_P0_PUDSEL + (port * 0xC)) | (1 << pin),
 108                 IFXMIPS_GPIO_P0_PUDSEL + (port * 0xC));
 109         return 0;
 110 }
 111 EXPORT_SYMBOL(ifxmips_port_set_pudsel);
 112
 113 int
 114 ifxmips_port_clear_pudsel (unsigned int port, unsigned int pin)
 115 {
 116     IFXMIPS_GPIO_SANITY;
 117         ifxmips_w32(ifxmips_r32(IFXMIPS_GPIO_P0_PUDSEL + (port * 0xC)) & ~(1 << pin),
 118                 IFXMIPS_GPIO_P0_PUDSEL + (port * 0xC));
 119         return 0;
 120 }
 121 EXPORT_SYMBOL(ifxmips_port_clear_pudsel);
 122
 123 int
 124 ifxmips_port_set_puden(unsigned int port, unsigned int pin)
 125 {
 126     IFXMIPS_GPIO_SANITY;
 127         ifxmips_w32(ifxmips_r32(IFXMIPS_GPIO_P0_PUDEN + (port * 0xC)) | (1 << pin),
 128                 IFXMIPS_GPIO_P0_PUDEN + (port * 0xC));
 129         return 0;
 130 }
 131 EXPORT_SYMBOL(ifxmips_port_set_puden);
 132
 133 int
 134 ifxmips_port_clear_puden(unsigned int port, unsigned int pin)
 135 {
 136     IFXMIPS_GPIO_SANITY;
 137         ifxmips_w32(ifxmips_r32(IFXMIPS_GPIO_P0_PUDEN + (port * 0xC)) & ~(1 << pin),
 138                 IFXMIPS_GPIO_P0_PUDEN + (port * 0xC));
 139         return 0;
 140 }
 141 EXPORT_SYMBOL(ifxmips_port_clear_puden);
 142
 143 int
 144 ifxmips_port_set_stoff(unsigned int port, unsigned int pin)
 145 {
 146     IFXMIPS_GPIO_SANITY;
 147         ifxmips_w32(ifxmips_r32(IFXMIPS_GPIO_P0_STOFF + (port * 0xC)) | (1 << pin),
 148                 IFXMIPS_GPIO_P0_STOFF + (port * 0xC));
 149         return 0;
 150 }
 151 EXPORT_SYMBOL(ifxmips_port_set_stoff);
 152
 153 int
 154 ifxmips_port_clear_stoff(unsigned int port, unsigned int pin)
 155 {
 156     IFXMIPS_GPIO_SANITY;
 157         ifxmips_w32(ifxmips_r32(IFXMIPS_GPIO_P0_STOFF + (port * 0xC)) & ~(1 << pin),
 158                 IFXMIPS_GPIO_P0_STOFF + (port * 0xC));
 159         return 0;
 160 }
 161 EXPORT_SYMBOL(ifxmips_port_clear_stoff);
 162
 163 int
 164 ifxmips_port_set_dir_out(unsigned int port, unsigned int pin)
 165 {
 166     IFXMIPS_GPIO_SANITY;
 167         ifxmips_w32(ifxmips_r32(IFXMIPS_GPIO_P0_DIR + (port * 0xC)) | (1 << pin),
 168                 IFXMIPS_GPIO_P0_DIR + (port * 0xC));
 169         return 0;
 170 }
 171 EXPORT_SYMBOL(ifxmips_port_set_dir_out);
 172
 173 int
 174 ifxmips_port_set_dir_in(unsigned int port, unsigned int pin)
 175 {
 176     IFXMIPS_GPIO_SANITY;
 177         ifxmips_w32(ifxmips_r32(IFXMIPS_GPIO_P0_DIR + (port * 0xC)) & ~(1 << pin),
 178                 IFXMIPS_GPIO_P0_DIR + (port * 0xC));
 179         return 0;
 180 }
 181 EXPORT_SYMBOL(ifxmips_port_set_dir_in);
 182
 183 int
 184 ifxmips_port_set_output(unsigned int port, unsigned int pin)
 185 {
 186     IFXMIPS_GPIO_SANITY;
 187         ifxmips_w32(ifxmips_r32(IFXMIPS_GPIO_P0_OUT + (port * 0xC)) | (1 << pin),
 188                 IFXMIPS_GPIO_P0_OUT + (port * 0xC));
 189         return 0;
 190 }
 191 EXPORT_SYMBOL(ifxmips_port_set_output);
 192
 193 int
 194 ifxmips_port_clear_output(unsigned int port, unsigned int pin)
 195 {
 196     IFXMIPS_GPIO_SANITY;
 197         ifxmips_w32(ifxmips_r32(IFXMIPS_GPIO_P0_OUT + (port * 0xC)) & ~(1 << pin),
 198                 IFXMIPS_GPIO_P0_OUT + (port * 0xC));
 199         return 0;
 200 }
 201 EXPORT_SYMBOL(ifxmips_port_clear_output);
 202
 203 int
 204 ifxmips_port_get_input(unsigned int port, unsigned int pin)
 205 {
 206     IFXMIPS_GPIO_SANITY;
 207         if (ifxmips_r32(IFXMIPS_GPIO_P0_IN + (port * 0xC)) & (1 << pin))
 208                 return 0;
 209         else
 210                 return 1;
 211 }
 212 EXPORT_SYMBOL(ifxmips_port_get_input);
 213
 214 int
 215 ifxmips_port_set_altsel0(unsigned int port, unsigned int pin)
 216 {
 217     IFXMIPS_GPIO_SANITY;
 218         ifxmips_w32(ifxmips_r32(IFXMIPS_GPIO_P0_ALTSEL0 + (port * 0xC)) | (1 << pin),
 219                 IFXMIPS_GPIO_P0_ALTSEL0 + (port * 0xC));
 220         return 0;
 221 }
 222 EXPORT_SYMBOL(ifxmips_port_set_altsel0);
 223
 224 int
 225 ifxmips_port_clear_altsel0(unsigned int port, unsigned int pin)
 226 {
 227     IFXMIPS_GPIO_SANITY;
 228         ifxmips_w32(ifxmips_r32(IFXMIPS_GPIO_P0_ALTSEL0 + (port * 0xC)) & ~(1 << pin),
 229                 IFXMIPS_GPIO_P0_ALTSEL0 + (port * 0xC));
 230         return 0;
 231 }
 232 EXPORT_SYMBOL(ifxmips_port_clear_altsel0);
 233
 234 int
 235 ifxmips_port_set_altsel1(unsigned int port, unsigned int pin)
 236 {
 237     IFXMIPS_GPIO_SANITY;
 238         ifxmips_w32(ifxmips_r32(IFXMIPS_GPIO_P0_ALTSEL1 + (port * 0xC)) | (1 << pin),
 239                 IFXMIPS_GPIO_P0_ALTSEL1 + (port * 0xC));
 240         return 0;
 241 }
 242 EXPORT_SYMBOL(ifxmips_port_set_altsel1);
 243
 244 int
 245 ifxmips_port_clear_altsel1(unsigned int port, unsigned int pin)
 246 {
 247     IFXMIPS_GPIO_SANITY;
 248         ifxmips_w32(ifxmips_r32(IFXMIPS_GPIO_P0_ALTSEL1 + (port * 0xC)) & ~(1 << pin),
 249                 IFXMIPS_GPIO_P0_ALTSEL1 + (port * 0xC));
 250         return 0;
 251 }
 252 EXPORT_SYMBOL(ifxmips_port_clear_altsel1);
 253
 254 #ifdef CONFIG_IFXMIPS_GPIO_RST_BTN
 255 static inline void
 256 add_msg(struct sk_buff *skb, char *msg)
 257 {
 258         char *scratch;
 259         scratch = skb_put(skb, strlen(msg) + 1);
 260         sprintf(scratch, msg);
 261 }
 262
 263 static void
 264 hotplug_button(struct work_struct *wq)
 265 {
 266         struct sk_buff *skb;
 267         struct event_t *event;
 268         size_t len;
 269         char *scratch, *s;
 270         char buf[128];
 271
 272         event = container_of(wq, struct event_t, wq);
 273         if(!uevent_sock)
 274                 goto done;
 275
 276         s = event->set ? "pressed" : "released";
 277         len = strlen(s) + 2;
 278         skb = alloc_skb(len + 2048, GFP_KERNEL);
 279         if(!skb)
 280                 goto done;
 281
 282         scratch = skb_put(skb, len);
 283         sprintf(scratch, "%s@",s);
 284         add_msg(skb, "HOME=/");
 285         add_msg(skb, "PATH=/sbin:/bin:/usr/sbin:/usr/bin");
 286         add_msg(skb, "SUBSYSTEM=button");
 287         add_msg(skb, "BUTTON=reset");
 288         add_msg(skb, (event->set ? "ACTION=pressed" : "ACTION=released"));
 289         sprintf(buf, "SEEN=%ld", (event->jiffies - seen)/HZ);
 290         add_msg(skb, buf);
 291         snprintf(buf, 128, "SEQNUM=%llu", uevent_next_seqnum());
 292         add_msg(skb, buf);
 293
 294         NETLINK_CB(skb).dst_group = 1;
 295         netlink_broadcast(uevent_sock, skb, 0, 1, GFP_KERNEL);
 296 done:
 297         kfree(event);
 298 }
 299
 300 static void
 301 reset_button_poll(unsigned long unused)
 302 {
 303         struct event_t *event;
 304
 305         rst_button_timer.expires = jiffies + (HZ / 4);
 306         add_timer(&rst_button_timer);
 307
 308         if (pressed != ifxmips_port_get_input(rst_port, rst_pin))
 309         {
 310                 if(pressed)
 311                         pressed = 0;
 312                 else
 313                         pressed = 1;
 314                 event = (struct event_t *) kzalloc(sizeof(struct event_t), GFP_ATOMIC);
 315                 if (!event)
 316                 {
 317                         printk("Could not alloc hotplug event\n");
 318                         return;
 319                 }
 320                 event->set = pressed;
 321                 event->jiffies = jiffies;
 322                 INIT_WORK(&event->wq, (void *)(void *)hotplug_button);
 323                 schedule_work(&event->wq);
 324                 seen = jiffies;
 325         }
 326 }
 327 #endif
 328
 329 static int
 330 ifxmips_gpio_probe(struct platform_device *dev)
 331 {
 332         int retval = 0;
 333
 334 #ifdef CONFIG_IFXMIPS_GPIO_RST_BTN
 335         rst_port = dev->resource[0].start;
 336         rst_pin = dev->resource[0].end;
 337         ifxmips_port_set_open_drain(rst_port, rst_pin);
 338         ifxmips_port_clear_altsel0(rst_port, rst_pin);
 339         ifxmips_port_clear_altsel1(rst_port, rst_pin);
 340         ifxmips_port_set_dir_in(rst_port, rst_pin);
 341         seen = jiffies;
 342         init_timer(&rst_button_timer);
 343         rst_button_timer.function = reset_button_poll;
 344         rst_button_timer.expires = jiffies + HZ;
 345         add_timer(&rst_button_timer);
 346 #endif
 347         return retval;
 348 }
 349
 350 static int
 351 ifxmips_gpio_remove(struct platform_device *pdev)
 352 {
 353 #ifdef CONFIG_IFXMIPS_GPIO_RST_BTN
 354         del_timer_sync(&rst_button_timer);
 355 #endif
 356         return 0;
 357 }
 358
 359 static struct
 360 platform_driver ifxmips_gpio_driver = {
 361         .probe = ifxmips_gpio_probe,
 362         .remove = ifxmips_gpio_remove,
 363         .driver = {
 364                 .name = "ifxmips_gpio",
 365                 .owner = THIS_MODULE,
 366         },
 367 };
 368
 369 int __init
 370 ifxmips_gpio_init(void)
 371 {
 372         int ret = platform_driver_register(&ifxmips_gpio_driver);
 373         if (ret)
 374                 printk(KERN_INFO "ifxmips_gpio : Error registering platfom driver!");
 375         return ret;
 376 }
 377
 378 void __exit
 379 ifxmips_gpio_exit(void)
 380 {
 381         platform_driver_unregister(&ifxmips_gpio_driver);
 382 }
 383
 384 module_init(ifxmips_gpio_init);
 385 module_exit(ifxmips_gpio_exit);