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