target/linux/s3c24xx/files-2.6.30/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 #include <linux/gta02-shadow.h>
  34
  35 int gta_gsm_interrupts;
  36 EXPORT_SYMBOL(gta_gsm_interrupts);
  37
  38 extern void s3c24xx_serial_console_set_silence(int);
  39
  40 struct gta02pm_priv {
  41         int gpio_ndl_gsm;
  42         struct console *con;
  43 };
  44
  45 static struct gta02pm_priv gta02_gsm;
  46
  47 static struct console *find_s3c24xx_console(void)
  48 {
  49         struct console *con;
  50
  51         acquire_console_sem();
  52
  53         for (con = console_drivers; con; con = con->next) {
  54                 if (!strcmp(con->name, "ttySAC"))
  55                         break;
  56         }
  57
  58         release_console_sem();
  59
  60         return con;
  61 }
  62
  63 static ssize_t gsm_read(struct device *dev, struct device_attribute *attr,
  64                         char *buf)
  65 {
  66         if (!strcmp(attr->attr.name, "power_on")) {
  67                 if (pcf50633_gpio_get(gta02_pcf, PCF50633_GPIO2))
  68                         goto out_1;
  69         } else if (!strcmp(attr->attr.name, "download")) {
  70                 if (!s3c2410_gpio_getpin(GTA02_GPIO_nDL_GSM))
  71                         goto out_1;
  72         } else if (!strcmp(attr->attr.name, "flowcontrolled")) {
  73                 if (s3c2410_gpio_getcfg(S3C2410_GPH1) == S3C2410_GPIO_OUTPUT)
  74                         goto out_1;
  75         }
  76
  77         return strlcpy(buf, "0\n", 3);
  78 out_1:
  79         return strlcpy(buf, "1\n", 3);
  80 }
  81
  82 static void gsm_on_off(struct device *dev, int on)
  83 {
  84         if (!on) {
  85                 s3c2410_gpio_cfgpin(S3C2410_GPH1, S3C2410_GPIO_INPUT);
  86                 s3c2410_gpio_cfgpin(S3C2410_GPH2, S3C2410_GPIO_INPUT);
  87
  88                 pcf50633_gpio_set(gta02_pcf, PCF50633_GPIO2, 0);
  89
  90                 if (gta02_gsm.con) {
  91                         s3c24xx_serial_console_set_silence(0);
  92                         console_start(gta02_gsm.con);
  93
  94                         dev_dbg(dev, "powered down gta02 GSM, enabling "
  95                                         "serial console\n");
  96                 }
  97
  98                 return;
  99         }
 100
 101         if (gta02_gsm.con) {
 102                 dev_dbg(dev, "powering up GSM, thus "
 103                                 "disconnecting serial console\n");
 104
 105                 console_stop(gta02_gsm.con);
 106                 s3c24xx_serial_console_set_silence(1);
 107         }
 108
 109         /* allow UART to talk to GSM side now we will power it */
 110         s3c2410_gpio_cfgpin(S3C2410_GPH1, S3C2410_GPH1_nRTS0);
 111         s3c2410_gpio_cfgpin(S3C2410_GPH2, S3C2410_GPH2_TXD0);
 112
 113         pcf50633_gpio_set(gta02_pcf, PCF50633_GPIO2, 7);
 114
 115         msleep(100);
 116
 117         gta02_gpb_setpin(GTA02_GPIO_MODEM_ON, 1);
 118         msleep(500);
 119         gta02_gpb_setpin(GTA02_GPIO_MODEM_ON, 0);
 120
 121         /*
 122          * workaround for calypso firmware moko10 and earlier,
 123          * without this it will leave IRQ line high after
 124          * booting
 125          */
 126         s3c2410_gpio_setpin(S3C2410_GPH1, 1);
 127         s3c2410_gpio_cfgpin(S3C2410_GPH1, S3C2410_GPH1_OUTP);
 128         msleep(1000);
 129         s3c2410_gpio_cfgpin(S3C2410_GPH1, S3C2410_GPH1_nRTS0);
 130
 131 }
 132
 133 static ssize_t gsm_write(struct device *dev, struct device_attribute *attr,
 134                          const char *buf, size_t count)
 135 {
 136         unsigned long on = simple_strtoul(buf, NULL, 10);
 137
 138         if (!strcmp(attr->attr.name, "power_on")) {
 139                 gsm_on_off(dev, on);
 140
 141                 return count;
 142         }
 143
 144         if (!strcmp(attr->attr.name, "download")) {
 145                 /*
 146                  * the keyboard / buttons driver requests and enables
 147                  * the JACK_INSERT IRQ.  We have to take care about
 148                  * not enabling and disabling the IRQ when it was
 149                  * already in that state or we get "unblanaced IRQ"
 150                  * kernel warnings and stack dumps.  So we use the
 151                  * copy of the ndl_gsm state to figure out if we should
 152                  * enable or disable the jack interrupt
 153                  */
 154                 if (on) {
 155                         if (gta02_gsm.gpio_ndl_gsm)
 156                                 disable_irq(gpio_to_irq(
 157                                                    GTA02_GPIO_JACK_INSERT));
 158                 } else {
 159                         if (!gta02_gsm.gpio_ndl_gsm)
 160                                 enable_irq(gpio_to_irq(
 161                                                    GTA02_GPIO_JACK_INSERT));
 162                 }
 163
 164                 gta02_gsm.gpio_ndl_gsm = !on;
 165                 s3c2410_gpio_setpin(GTA02_GPIO_nDL_GSM, !on);
 166
 167                 return count;
 168         }
 169
 170         if (!strcmp(attr->attr.name, "flowcontrolled")) {
 171                 if (on) {
 172                         gta_gsm_interrupts = 0;
 173                         s3c2410_gpio_setpin(S3C2410_GPH1, 1);
 174                         s3c2410_gpio_cfgpin(S3C2410_GPH1, S3C2410_GPH1_OUTP);
 175                 } else
 176                         s3c2410_gpio_cfgpin(S3C2410_GPH1, S3C2410_GPH1_nRTS0);
 177         }
 178
 179         return count;
 180 }
 181
 182 static DEVICE_ATTR(power_on, 0644, gsm_read, gsm_write);
 183 static DEVICE_ATTR(reset, 0644, gsm_read, gsm_write);
 184 static DEVICE_ATTR(download, 0644, gsm_read, gsm_write);
 185 static DEVICE_ATTR(flowcontrolled, 0644, gsm_read, gsm_write);
 186
 187 #ifdef CONFIG_PM
 188
 189 static int gta02_gsm_resume(struct platform_device *pdev);
 190 static int gta02_gsm_suspend(struct platform_device *pdev, pm_message_t state)
 191 {
 192         /* GPIO state is saved/restored by S3C2410 core GPIO driver, so we
 193          * don't need to do much here. */
 194
 195         /* If flowcontrol asserted, abort if GSM already interrupted */
 196         if (s3c2410_gpio_getcfg(S3C2410_GPH1) == S3C2410_GPIO_OUTPUT) {
 197                 if (gta_gsm_interrupts)
 198                         goto busy;
 199         }
 200
 201         /* disable DL GSM to prevent jack_insert becoming 'floating' */
 202         s3c2410_gpio_setpin(GTA02_GPIO_nDL_GSM, 1);
 203         return 0;
 204
 205 busy:
 206         return -EBUSY;
 207 }
 208
 209 static int
 210 gta02_gsm_suspend_late(struct platform_device *pdev, pm_message_t state)
 211 {
 212         /* Last chance: abort if GSM already interrupted */
 213         if (s3c2410_gpio_getcfg(S3C2410_GPH1) == S3C2410_GPIO_OUTPUT) {
 214                 if (gta_gsm_interrupts)
 215                         return -EBUSY;
 216         }
 217         return 0;
 218 }
 219
 220 static int gta02_gsm_resume(struct platform_device *pdev)
 221 {
 222         /* GPIO state is saved/restored by S3C2410 core GPIO driver, so we
 223          * don't need to do much here. */
 224
 225         /* Make sure that the kernel console on the serial port is still
 226          * disabled. FIXME: resume ordering race with serial driver! */
 227         if (gta02_gsm.con && s3c2410_gpio_getpin(GTA02_GPIO_MODEM_ON))
 228                 console_stop(gta02_gsm.con);
 229
 230         s3c2410_gpio_setpin(GTA02_GPIO_nDL_GSM, gta02_gsm.gpio_ndl_gsm);
 231
 232         return 0;
 233 }
 234 #else
 235 #define gta02_gsm_suspend       NULL
 236 #define gta02_gsm_suspend_late  NULL
 237 #define gta02_gsm_resume        NULL
 238 #endif /* CONFIG_PM */
 239
 240 static struct attribute *gta02_gsm_sysfs_entries[] = {
 241         &dev_attr_power_on.attr,
 242         &dev_attr_reset.attr,
 243         &dev_attr_download.attr,
 244         &dev_attr_flowcontrolled.attr,
 245         NULL
 246 };
 247
 248 static struct attribute_group gta02_gsm_attr_group = {
 249         .name   = NULL,
 250         .attrs  = gta02_gsm_sysfs_entries,
 251 };
 252
 253 static int __init gta02_gsm_probe(struct platform_device *pdev)
 254 {
 255         switch (S3C_SYSTEM_REV_ATAG) {
 256         case GTA02v1_SYSTEM_REV:
 257         case GTA02v2_SYSTEM_REV:
 258         case GTA02v3_SYSTEM_REV:
 259         case GTA02v4_SYSTEM_REV:
 260         case GTA02v5_SYSTEM_REV:
 261         case GTA02v6_SYSTEM_REV:
 262                 break;
 263         default:
 264                 dev_warn(&pdev->dev, "Unknown Freerunner Revision 0x%x, "
 265                          "some PM features not available!!!\n",
 266                          system_rev);
 267                 break;
 268         }
 269
 270         gta02_gsm.con = find_s3c24xx_console();
 271         if (!gta02_gsm.con)
 272                 dev_warn(&pdev->dev,
 273                          "cannot find S3C24xx console driver\n");
 274
 275         /* note that download initially disabled, and enforce that */
 276         gta02_gsm.gpio_ndl_gsm = 1;
 277         s3c2410_gpio_setpin(GTA02_GPIO_nDL_GSM, 1);
 278
 279         /* GSM is to be initially off (at boot, or if this module inserted) */
 280         gsm_on_off(&pdev->dev, 0);
 281
 282         return sysfs_create_group(&pdev->dev.kobj, &gta02_gsm_attr_group);
 283 }
 284
 285 static int gta02_gsm_remove(struct platform_device *pdev)
 286 {
 287         sysfs_remove_group(&pdev->dev.kobj, &gta02_gsm_attr_group);
 288
 289         return 0;
 290 }
 291
 292 static struct platform_driver gta02_gsm_driver = {
 293         .probe          = gta02_gsm_probe,
 294         .remove         = gta02_gsm_remove,
 295         .suspend        = gta02_gsm_suspend,
 296         .suspend_late   = gta02_gsm_suspend_late,
 297         .resume         = gta02_gsm_resume,
 298         .driver         = {
 299                 .name           = "gta02-pm-gsm",
 300         },
 301 };
 302
 303 static int __devinit gta02_gsm_init(void)
 304 {
 305         return platform_driver_register(&gta02_gsm_driver);
 306 }
 307
 308 static void gta02_gsm_exit(void)
 309 {
 310         platform_driver_unregister(&gta02_gsm_driver);
 311 }
 312
 313 module_init(gta02_gsm_init);
 314 module_exit(gta02_gsm_exit);
 315
 316 MODULE_LICENSE("GPL");
 317 MODULE_AUTHOR("Harald Welte <laforge@openmoko.org>");
 318 MODULE_DESCRIPTION("Openmoko Freerunner GSM Power Management");