target/linux/s3c24xx/files-2.6.31/arch/arm/mach-s3c2442/gta02-pm-gsm.c

   1 /*
   2  * GSM Management code for the Openmoko Freerunner GSM Phone
   3  *
   4  * (C) 2007 by Openmoko Inc.
   5  * Author: Harald Welte <laforge@openmoko.org>
   6  * All rights reserved.
   7  *
   8  * This program is free software; you can redistribute it and/or modify
   9  * it under the terms of the GNU General Public License version 2 as
  10  * published by the Free Software Foundation
  11  *
  12  */
  13
  14 #include <linux/module.h>
  15 #include <linux/init.h>
  16 #include <linux/kernel.h>
  17 #include <linux/platform_device.h>
  18 #include <linux/console.h>
  19 #include <linux/errno.h>
  20 #include <linux/interrupt.h>
  21 #include <linux/delay.h>
  22
  23 #include <mach/gpio.h>
  24 #include <asm/mach-types.h>
  25
  26 #include <mach/hardware.h>
  27 #include <mach/cpu.h>
  28
  29 #include <mach/gta02.h>
  30 #include <linux/mfd/pcf50633/gpio.h>
  31 #include <mach/regs-gpio.h>
  32 #include <mach/regs-gpioj.h>
  33
  34 int gta_gsm_interrupts;
  35 EXPORT_SYMBOL(gta_gsm_interrupts);
  36
  37 extern void s3c24xx_serial_console_set_silence(int);
  38
  39 struct gta02pm_priv {
  40         int gpio_ndl_gsm;
  41         struct console *con;
  42 };
  43
  44 static struct gta02pm_priv gta02_gsm;
  45
  46 static struct console *find_s3c24xx_console(void)
  47 {
  48         struct console *con;
  49
  50         acquire_console_sem();
  51
  52         for (con = console_drivers; con; con = con->next) {
  53                 if (!strcmp(con->name, "ttySAC"))
  54                         break;
  55         }
  56
  57         release_console_sem();
  58
  59         return con;
  60 }
  61
  62 static ssize_t gsm_read(struct device *dev, struct device_attribute *attr,
  63                         char *buf)
  64 {
  65         if (!strcmp(attr->attr.name, "power_on")) {
  66                 if (pcf50633_gpio_get(gta02_pcf, PCF50633_GPIO2))
  67                         goto out_1;
  68         } else if (!strcmp(attr->attr.name, "download")) {
  69                 if (!s3c2410_gpio_getpin(GTA02_GPIO_nDL_GSM))
  70                         goto out_1;
  71         } else if (!strcmp(attr->attr.name, "flowcontrolled")) {
  72                 if (s3c2410_gpio_getcfg(S3C2410_GPH(1)) == S3C2410_GPIO_OUTPUT)
  73                         goto out_1;
  74         }
  75
  76         return strlcpy(buf, "0\n", 3);
  77 out_1:
  78         return strlcpy(buf, "1\n", 3);
  79 }
  80
  81 static void gsm_on_off(struct device *dev, int on)
  82 {
  83         if (!on) {
  84                 s3c2410_gpio_cfgpin(S3C2410_GPH(1), S3C2410_GPIO_INPUT);
  85                 s3c2410_gpio_cfgpin(S3C2410_GPH(2), S3C2410_GPIO_INPUT);
  86
  87                 pcf50633_gpio_set(gta02_pcf, PCF50633_GPIO2, 0);
  88
  89                 if (gta02_gsm.con) {
  90                         s3c24xx_serial_console_set_silence(0);
  91                         console_start(gta02_gsm.con);
  92
  93                         dev_dbg(dev, "powered down gta02 GSM, enabling "
  94                                         "serial console\n");
  95                 }
  96
  97                 return;
  98         }
  99
 100         if (gta02_gsm.con) {
 101                 dev_dbg(dev, "powering up GSM, thus "
 102                                 "disconnecting serial console\n");
 103
 104                 console_stop(gta02_gsm.con);
 105                 s3c24xx_serial_console_set_silence(1);
 106         }
 107
 108         /* allow UART to talk to GSM side now we will power it */
 109         s3c2410_gpio_cfgpin(S3C2410_GPH(1), S3C2410_GPH1_nRTS0);
 110         s3c2410_gpio_cfgpin(S3C2410_GPH(2), S3C2410_GPH2_TXD0);
 111
 112         pcf50633_gpio_set(gta02_pcf, PCF50633_GPIO2, 7);
 113
 114         msleep(100);
 115
 116         s3c2410_gpio_setpin(GTA02_GPIO_MODEM_ON, 1);
 117         msleep(500);
 118         s3c2410_gpio_setpin(GTA02_GPIO_MODEM_ON, 0);
 119
 120         /*
 121          * workaround for calypso firmware moko10 and earlier,
 122          * without this it will leave IRQ line high after
 123          * booting
 124          */
 125         s3c2410_gpio_setpin(S3C2410_GPH(1), 1);
 126         s3c2410_gpio_cfgpin(S3C2410_GPH(1), S3C2410_GPIO_OUTPUT);
 127         msleep(1000);
 128         s3c2410_gpio_cfgpin(S3C2410_GPH(1), S3C2410_GPH1_nRTS0);
 129
 130 }
 131
 132 static ssize_t gsm_write(struct device *dev, struct device_attribute *attr,
 133                          const char *buf, size_t count)
 134 {
 135         unsigned long on = simple_strtoul(buf, NULL, 10);
 136
 137         if (!strcmp(attr->attr.name, "power_on")) {
 138                 gsm_on_off(dev, on);
 139
 140                 return count;
 141         }
 142
 143         if (!strcmp(attr->attr.name, "download")) {
 144                 /*
 145                  * the keyboard / buttons driver requests and enables
 146                  * the JACK_INSERT IRQ.  We have to take care about
 147                  * not enabling and disabling the IRQ when it was
 148                  * already in that state or we get "unblanaced IRQ"
 149                  * kernel warnings and stack dumps.  So we use the
 150                  * copy of the ndl_gsm state to figure out if we should
 151                  * enable or disable the jack interrupt
 152                  */
 153                 if (on) {
 154                         if (gta02_gsm.gpio_ndl_gsm)
 155                                 disable_irq(gpio_to_irq(
 156                                                    GTA02_GPIO_JACK_INSERT));
 157                 } else {
 158                         if (!gta02_gsm.gpio_ndl_gsm)
 159                                 enable_irq(gpio_to_irq(
 160                                                    GTA02_GPIO_JACK_INSERT));
 161                 }
 162
 163                 gta02_gsm.gpio_ndl_gsm = !on;
 164                 s3c2410_gpio_setpin(GTA02_GPIO_nDL_GSM, !on);
 165
 166                 return count;
 167         }
 168
 169         if (!strcmp(attr->attr.name, "flowcontrolled")) {
 170                 if (on) {
 171                         gta_gsm_interrupts = 0;
 172                         s3c2410_gpio_setpin(S3C2410_GPH(1), 1);
 173                         s3c2410_gpio_cfgpin(S3C2410_GPH(1), S3C2410_GPIO_OUTPUT);
 174                 } else
 175                         s3c2410_gpio_cfgpin(S3C2410_GPH(1), S3C2410_GPH1_nRTS0);
 176         }
 177
 178         return count;
 179 }
 180
 181 static DEVICE_ATTR(power_on, 0644, gsm_read, gsm_write);
 182 static DEVICE_ATTR(reset, 0644, gsm_read, gsm_write);
 183 static DEVICE_ATTR(download, 0644, gsm_read, gsm_write);
 184 static DEVICE_ATTR(flowcontrolled, 0644, gsm_read, gsm_write);
 185
 186 #ifdef CONFIG_PM
 187
 188 static int gta02_gsm_resume(struct platform_device *pdev);
 189 static int gta02_gsm_suspend(struct platform_device *pdev, pm_message_t state)
 190 {
 191         /* GPIO state is saved/restored by S3C2410 core GPIO driver, so we
 192          * don't need to do much here. */
 193
 194         /* If flowcontrol asserted, abort if GSM already interrupted */
 195         if (s3c2410_gpio_getcfg(S3C2410_GPH(1)) == S3C2410_GPIO_OUTPUT) {
 196                 if (gta_gsm_interrupts)
 197                         goto busy;
 198         }
 199
 200         /* disable DL GSM to prevent jack_insert becoming 'floating' */
 201         s3c2410_gpio_setpin(GTA02_GPIO_nDL_GSM, 1);
 202         return 0;
 203
 204 busy:
 205         return -EBUSY;
 206 }
 207
 208 static int
 209 gta02_gsm_suspend_late(struct platform_device *pdev, pm_message_t state)
 210 {
 211         /* Last chance: abort if GSM already interrupted */
 212         if (s3c2410_gpio_getcfg(S3C2410_GPH(1)) == S3C2410_GPIO_OUTPUT) {
 213                 if (gta_gsm_interrupts)
 214                         return -EBUSY;
 215         }
 216         return 0;
 217 }
 218
 219 static int gta02_gsm_resume(struct platform_device *pdev)
 220 {
 221         /* GPIO state is saved/restored by S3C2410 core GPIO driver, so we
 222          * don't need to do much here. */
 223
 224         /* Make sure that the kernel console on the serial port is still
 225          * disabled. FIXME: resume ordering race with serial driver! */
 226         if (gta02_gsm.con && s3c2410_gpio_getpin(GTA02_GPIO_MODEM_ON))
 227                 console_stop(gta02_gsm.con);
 228
 229         s3c2410_gpio_setpin(GTA02_GPIO_nDL_GSM, gta02_gsm.gpio_ndl_gsm);
 230
 231         return 0;
 232 }
 233 #else
 234 #define gta02_gsm_suspend       NULL
 235 #define gta02_gsm_suspend_late  NULL
 236 #define gta02_gsm_resume        NULL
 237 #endif /* CONFIG_PM */
 238
 239 static struct attribute *gta02_gsm_sysfs_entries[] = {
 240         &dev_attr_power_on.attr,
 241         &dev_attr_reset.attr,
 242         &dev_attr_download.attr,
 243         &dev_attr_flowcontrolled.attr,
 244         NULL
 245 };
 246
 247 static struct attribute_group gta02_gsm_attr_group = {
 248         .name   = NULL,
 249         .attrs  = gta02_gsm_sysfs_entries,
 250 };
 251
 252 static int __init gta02_gsm_probe(struct platform_device *pdev)
 253 {
 254         switch (S3C_SYSTEM_REV_ATAG) {
 255         case GTA02v1_SYSTEM_REV:
 256         case GTA02v2_SYSTEM_REV:
 257         case GTA02v3_SYSTEM_REV:
 258         case GTA02v4_SYSTEM_REV:
 259         case GTA02v5_SYSTEM_REV:
 260         case GTA02v6_SYSTEM_REV:
 261                 break;
 262         default:
 263                 dev_warn(&pdev->dev, "Unknown Freerunner Revision 0x%x, "
 264                          "some PM features not available!!!\n",
 265                          system_rev);
 266                 break;
 267         }
 268
 269         gta02_gsm.con = find_s3c24xx_console();
 270         if (!gta02_gsm.con)
 271                 dev_warn(&pdev->dev,
 272                          "cannot find S3C24xx console driver\n");
 273
 274         /* note that download initially disabled, and enforce that */
 275         gta02_gsm.gpio_ndl_gsm = 1;
 276         s3c2410_gpio_setpin(GTA02_GPIO_nDL_GSM, 1);
 277
 278         /* GSM is to be initially off (at boot, or if this module inserted) */
 279         gsm_on_off(&pdev->dev, 0);
 280
 281         return sysfs_create_group(&pdev->dev.kobj, &gta02_gsm_attr_group);
 282 }
 283
 284 static int gta02_gsm_remove(struct platform_device *pdev)
 285 {
 286         sysfs_remove_group(&pdev->dev.kobj, &gta02_gsm_attr_group);
 287
 288         return 0;
 289 }
 290
 291 static struct platform_driver gta02_gsm_driver = {
 292         .probe          = gta02_gsm_probe,
 293         .remove         = gta02_gsm_remove,
 294         .suspend        = gta02_gsm_suspend,
 295         .suspend_late   = gta02_gsm_suspend_late,
 296         .resume         = gta02_gsm_resume,
 297         .driver         = {
 298                 .name           = "gta02-pm-gsm",
 299         },
 300 };
 301
 302 static int __devinit gta02_gsm_init(void)
 303 {
 304         return platform_driver_register(&gta02_gsm_driver);
 305 }
 306
 307 static void gta02_gsm_exit(void)
 308 {
 309         platform_driver_unregister(&gta02_gsm_driver);
 310 }
 311
 312 module_init(gta02_gsm_init);
 313 module_exit(gta02_gsm_exit);
 314
 315 MODULE_LICENSE("GPL");
 316 MODULE_AUTHOR("Harald Welte <laforge@openmoko.org>");
 317 MODULE_DESCRIPTION("Openmoko Freerunner GSM Power Management");