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