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 <linux/uaccess.h>
  39 #include <linux/semaphore.h>
  40 #include <asm/ifxmips/ifxmips.h>
  41
  42 #define MAX_PORTS                       2
  43 #define PINS_PER_PORT           16
  44
  45 #ifdef CONFIG_IFXMIPS_GPIO_RST_BTN
  46
  47 unsigned int rst_port = 1;
  48 unsigned int rst_pin = 15;
  49 static struct timer_list rst_button_timer;
  50
  51 extern struct sock *uevent_sock;
  52 extern u64 uevent_next_seqnum(void);
  53 static unsigned long seen;
  54 static int pressed = 0;
  55
  56 struct event_t {
  57         struct work_struct wq;
  58         int set;
  59         unsigned long jiffies;
  60 };
  61 #endif
  62
  63 #define IFXMIPS_GPIO_SANITY             {if (port > MAX_PORTS || pin > PINS_PER_PORT) return -EINVAL; }
  64 int
  65 ifxmips_port_reserve_pin(unsigned int port, unsigned int pin)
  66 {
  67         IFXMIPS_GPIO_SANITY;
  68         printk("%s : call to obseleted function\n", __func__);
  69         return 0;
  70 }
  71 EXPORT_SYMBOL(ifxmips_port_reserve_pin);
  72
  73 int
  74 ifxmips_port_free_pin(unsigned int port, unsigned int pin)
  75 {
  76         IFXMIPS_GPIO_SANITY;
  77         printk("%s : call to obseleted function\n", __func__);
  78         return 0;
  79 }
  80 EXPORT_SYMBOL(ifxmips_port_free_pin);
  81
  82 int
  83 ifxmips_port_set_open_drain(unsigned int port, unsigned int pin)
  84 {
  85         IFXMIPS_GPIO_SANITY;
  86         ifxmips_w32(ifxmips_r32(IFXMIPS_GPIO_P0_OD + (port * 0xC)) | (1 << pin),
  87                 IFXMIPS_GPIO_P0_OD + (port * 0xC));
  88         return 0;
  89 }
  90 EXPORT_SYMBOL(ifxmips_port_set_open_drain);
  91
  92 int
  93 ifxmips_port_clear_open_drain(unsigned int port, unsigned int pin)
  94 {
  95         IFXMIPS_GPIO_SANITY;
  96         ifxmips_w32(ifxmips_r32(IFXMIPS_GPIO_P0_OD + (port * 0xC)) & ~(1 << pin),
  97                 IFXMIPS_GPIO_P0_OD + (port * 0xC));
  98         return 0;
  99 }
 100 EXPORT_SYMBOL(ifxmips_port_clear_open_drain);
 101
 102 int
 103 ifxmips_port_set_pudsel(unsigned int port, unsigned int pin)
 104 {
 105     IFXMIPS_GPIO_SANITY;
 106         ifxmips_w32(ifxmips_r32(IFXMIPS_GPIO_P0_PUDSEL + (port * 0xC)) | (1 << pin),
 107                 IFXMIPS_GPIO_P0_PUDSEL + (port * 0xC));
 108         return 0;
 109 }
 110 EXPORT_SYMBOL(ifxmips_port_set_pudsel);
 111
 112 int
 113 ifxmips_port_clear_pudsel (unsigned int port, unsigned int pin)
 114 {
 115     IFXMIPS_GPIO_SANITY;
 116         ifxmips_w32(ifxmips_r32(IFXMIPS_GPIO_P0_PUDSEL + (port * 0xC)) & ~(1 << pin),
 117                 IFXMIPS_GPIO_P0_PUDSEL + (port * 0xC));
 118         return 0;
 119 }
 120 EXPORT_SYMBOL(ifxmips_port_clear_pudsel);
 121
 122 int
 123 ifxmips_port_set_puden(unsigned int port, unsigned int pin)
 124 {
 125     IFXMIPS_GPIO_SANITY;
 126         ifxmips_w32(ifxmips_r32(IFXMIPS_GPIO_P0_PUDEN + (port * 0xC)) | (1 << pin),
 127                 IFXMIPS_GPIO_P0_PUDEN + (port * 0xC));
 128         return 0;
 129 }
 130 EXPORT_SYMBOL(ifxmips_port_set_puden);
 131
 132 int
 133 ifxmips_port_clear_puden(unsigned int port, unsigned int pin)
 134 {
 135     IFXMIPS_GPIO_SANITY;
 136         ifxmips_w32(ifxmips_r32(IFXMIPS_GPIO_P0_PUDEN + (port * 0xC)) & ~(1 << pin),
 137                 IFXMIPS_GPIO_P0_PUDEN + (port * 0xC));
 138         return 0;
 139 }
 140 EXPORT_SYMBOL(ifxmips_port_clear_puden);
 141
 142 int
 143 ifxmips_port_set_stoff(unsigned int port, unsigned int pin)
 144 {
 145     IFXMIPS_GPIO_SANITY;
 146         ifxmips_w32(ifxmips_r32(IFXMIPS_GPIO_P0_STOFF + (port * 0xC)) | (1 << pin),
 147                 IFXMIPS_GPIO_P0_STOFF + (port * 0xC));
 148         return 0;
 149 }
 150 EXPORT_SYMBOL(ifxmips_port_set_stoff);
 151
 152 int
 153 ifxmips_port_clear_stoff(unsigned int port, unsigned int pin)
 154 {
 155     IFXMIPS_GPIO_SANITY;
 156         ifxmips_w32(ifxmips_r32(IFXMIPS_GPIO_P0_STOFF + (port * 0xC)) & ~(1 << pin),
 157                 IFXMIPS_GPIO_P0_STOFF + (port * 0xC));
 158         return 0;
 159 }
 160 EXPORT_SYMBOL(ifxmips_port_clear_stoff);
 161
 162 int
 163 ifxmips_port_set_dir_out(unsigned int port, unsigned int pin)
 164 {
 165     IFXMIPS_GPIO_SANITY;
 166         ifxmips_w32(ifxmips_r32(IFXMIPS_GPIO_P0_DIR + (port * 0xC)) | (1 << pin),
 167                 IFXMIPS_GPIO_P0_DIR + (port * 0xC));
 168         return 0;
 169 }
 170 EXPORT_SYMBOL(ifxmips_port_set_dir_out);
 171
 172 int
 173 ifxmips_port_set_dir_in(unsigned int port, unsigned int pin)
 174 {
 175     IFXMIPS_GPIO_SANITY;
 176         ifxmips_w32(ifxmips_r32(IFXMIPS_GPIO_P0_DIR + (port * 0xC)) & ~(1 << pin),
 177                 IFXMIPS_GPIO_P0_DIR + (port * 0xC));
 178         return 0;
 179 }
 180 EXPORT_SYMBOL(ifxmips_port_set_dir_in);
 181
 182 int
 183 ifxmips_port_set_output(unsigned int port, unsigned int pin)
 184 {
 185     IFXMIPS_GPIO_SANITY;
 186         ifxmips_w32(ifxmips_r32(IFXMIPS_GPIO_P0_OUT + (port * 0xC)) | (1 << pin),
 187                 IFXMIPS_GPIO_P0_OUT + (port * 0xC));
 188         return 0;
 189 }
 190 EXPORT_SYMBOL(ifxmips_port_set_output);
 191
 192 int
 193 ifxmips_port_clear_output(unsigned int port, unsigned int pin)
 194 {
 195     IFXMIPS_GPIO_SANITY;
 196         ifxmips_w32(ifxmips_r32(IFXMIPS_GPIO_P0_OUT + (port * 0xC)) & ~(1 << pin),
 197                 IFXMIPS_GPIO_P0_OUT + (port * 0xC));
 198         return 0;
 199 }
 200 EXPORT_SYMBOL(ifxmips_port_clear_output);
 201
 202 int
 203 ifxmips_port_get_input(unsigned int port, unsigned int pin)
 204 {
 205     IFXMIPS_GPIO_SANITY;
 206         if (ifxmips_r32(IFXMIPS_GPIO_P0_IN + (port * 0xC)) & (1 << pin))
 207                 return 0;
 208         else
 209                 return 1;
 210 }
 211 EXPORT_SYMBOL(ifxmips_port_get_input);
 212
 213 int
 214 ifxmips_port_set_altsel0(unsigned int port, unsigned int pin)
 215 {
 216     IFXMIPS_GPIO_SANITY;
 217         ifxmips_w32(ifxmips_r32(IFXMIPS_GPIO_P0_ALTSEL0 + (port * 0xC)) | (1 << pin),
 218                 IFXMIPS_GPIO_P0_ALTSEL0 + (port * 0xC));
 219         return 0;
 220 }
 221 EXPORT_SYMBOL(ifxmips_port_set_altsel0);
 222
 223 int
 224 ifxmips_port_clear_altsel0(unsigned int port, unsigned int pin)
 225 {
 226     IFXMIPS_GPIO_SANITY;
 227         ifxmips_w32(ifxmips_r32(IFXMIPS_GPIO_P0_ALTSEL0 + (port * 0xC)) & ~(1 << pin),
 228                 IFXMIPS_GPIO_P0_ALTSEL0 + (port * 0xC));
 229         return 0;
 230 }
 231 EXPORT_SYMBOL(ifxmips_port_clear_altsel0);
 232
 233 int
 234 ifxmips_port_set_altsel1(unsigned int port, unsigned int pin)
 235 {
 236     IFXMIPS_GPIO_SANITY;
 237         ifxmips_w32(ifxmips_r32(IFXMIPS_GPIO_P0_ALTSEL1 + (port * 0xC)) | (1 << pin),
 238                 IFXMIPS_GPIO_P0_ALTSEL1 + (port * 0xC));
 239         return 0;
 240 }
 241 EXPORT_SYMBOL(ifxmips_port_set_altsel1);
 242
 243 int
 244 ifxmips_port_clear_altsel1(unsigned int port, unsigned int pin)
 245 {
 246     IFXMIPS_GPIO_SANITY;
 247         ifxmips_w32(ifxmips_r32(IFXMIPS_GPIO_P0_ALTSEL1 + (port * 0xC)) & ~(1 << pin),
 248                 IFXMIPS_GPIO_P0_ALTSEL1 + (port * 0xC));
 249         return 0;
 250 }
 251 EXPORT_SYMBOL(ifxmips_port_clear_altsel1);
 252
 253 #ifdef CONFIG_IFXMIPS_GPIO_RST_BTN
 254 static inline void
 255 add_msg(struct sk_buff *skb, char *msg)
 256 {
 257         char *scratch;
 258         scratch = skb_put(skb, strlen(msg) + 1);
 259         sprintf(scratch, msg);
 260 }
 261
 262 static void
 263 hotplug_button(struct work_struct *wq)
 264 {
 265         struct sk_buff *skb;
 266         struct event_t *event;
 267         size_t len;
 268         char *scratch, *s;
 269         char buf[128];
 270
 271         event = container_of(wq, struct event_t, wq);
 272         if(!uevent_sock)
 273                 goto done;
 274
 275         s = event->set ? "pressed" : "released";
 276         len = strlen(s) + 2;
 277         skb = alloc_skb(len + 2048, GFP_KERNEL);
 278         if(!skb)
 279                 goto done;
 280
 281         scratch = skb_put(skb, len);
 282         sprintf(scratch, "%s@",s);
 283         add_msg(skb, "HOME=/");
 284         add_msg(skb, "PATH=/sbin:/bin:/usr/sbin:/usr/bin");
 285         add_msg(skb, "SUBSYSTEM=button");
 286         add_msg(skb, "BUTTON=reset");
 287         add_msg(skb, (event->set ? "ACTION=pressed" : "ACTION=released"));
 288         sprintf(buf, "SEEN=%ld", (event->jiffies - seen)/HZ);
 289         add_msg(skb, buf);
 290         snprintf(buf, 128, "SEQNUM=%llu", uevent_next_seqnum());
 291         add_msg(skb, buf);
 292
 293         NETLINK_CB(skb).dst_group = 1;
 294         netlink_broadcast(uevent_sock, skb, 0, 1, GFP_KERNEL);
 295 done:
 296         kfree(event);
 297 }
 298
 299 static void
 300 reset_button_poll(unsigned long unused)
 301 {
 302         struct event_t *event;
 303
 304         rst_button_timer.expires = jiffies + (HZ / 4);
 305         add_timer(&rst_button_timer);
 306
 307         if (pressed != ifxmips_port_get_input(rst_port, rst_pin))
 308         {
 309                 if(pressed)
 310                         pressed = 0;
 311                 else
 312                         pressed = 1;
 313                 event = (struct event_t *) kzalloc(sizeof(struct event_t), GFP_ATOMIC);
 314                 if (!event)
 315                 {
 316                         printk("Could not alloc hotplug event\n");
 317                         return;
 318                 }
 319                 event->set = pressed;
 320                 event->jiffies = jiffies;
 321                 INIT_WORK(&event->wq, (void *)(void *)hotplug_button);
 322                 schedule_work(&event->wq);
 323                 seen = jiffies;
 324         }
 325 }
 326 #endif
 327
 328 static int
 329 ifxmips_gpio_probe(struct platform_device *dev)
 330 {
 331         int retval = 0;
 332
 333 #ifdef CONFIG_IFXMIPS_GPIO_RST_BTN
 334         rst_port = dev->resource[0].start;
 335         rst_pin = dev->resource[0].end;
 336         ifxmips_port_set_open_drain(rst_port, rst_pin);
 337         ifxmips_port_clear_altsel0(rst_port, rst_pin);
 338         ifxmips_port_clear_altsel1(rst_port, rst_pin);
 339         ifxmips_port_set_dir_in(rst_port, rst_pin);
 340         seen = jiffies;
 341         init_timer(&rst_button_timer);
 342         rst_button_timer.function = reset_button_poll;
 343         rst_button_timer.expires = jiffies + HZ;
 344         add_timer(&rst_button_timer);
 345 #endif
 346         return retval;
 347 }
 348
 349 static int
 350 ifxmips_gpio_remove(struct platform_device *pdev)
 351 {
 352 #ifdef CONFIG_IFXMIPS_GPIO_RST_BTN
 353         del_timer_sync(&rst_button_timer);
 354 #endif
 355         return 0;
 356 }
 357
 358 static struct
 359 platform_driver ifxmips_gpio_driver = {
 360         .probe = ifxmips_gpio_probe,
 361         .remove = ifxmips_gpio_remove,
 362         .driver = {
 363                 .name = "ifxmips_gpio",
 364                 .owner = THIS_MODULE,
 365         },
 366 };
 367
 368 int __init
 369 ifxmips_gpio_init(void)
 370 {
 371         int ret = platform_driver_register(&ifxmips_gpio_driver);
 372         if (ret)
 373                 printk(KERN_INFO "ifxmips_gpio : Error registering platfom driver!");
 374         return ret;
 375 }
 376
 377 void __exit
 378 ifxmips_gpio_exit(void)
 379 {
 380         platform_driver_unregister(&ifxmips_gpio_driver);
 381 }
 382
 383 module_init(ifxmips_gpio_init);
 384 module_exit(ifxmips_gpio_exit);