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