diff options
Diffstat (limited to 'target/linux/s3c24xx/files-2.6.30/arch/arm/mach-s3c2442/gta02-pm-gsm.c')
| -rw-r--r-- | target/linux/s3c24xx/files-2.6.30/arch/arm/mach-s3c2442/gta02-pm-gsm.c | 275 |
1 files changed, 275 insertions, 0 deletions
diff --git a/target/linux/s3c24xx/files-2.6.30/arch/arm/mach-s3c2442/gta02-pm-gsm.c b/target/linux/s3c24xx/files-2.6.30/arch/arm/mach-s3c2442/gta02-pm-gsm.c new file mode 100644 index 0000000000..2f1da04f5b --- /dev/null +++ b/target/linux/s3c24xx/files-2.6.30/arch/arm/mach-s3c2442/gta02-pm-gsm.c @@ -0,0 +1,275 @@ +/* + * GSM Management code for the Openmoko Freerunner GSM Phone + * + * (C) 2007 by Openmoko Inc. + * Author: Harald Welte <laforge@openmoko.org> + * All rights reserved. + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License version 2 as + * published by the Free Software Foundation + * + */ + +#include <linux/module.h> +#include <linux/init.h> +#include <linux/kernel.h> +#include <linux/platform_device.h> +#include <linux/console.h> +#include <linux/errno.h> +#include <linux/interrupt.h> +#include <linux/delay.h> +#include <linux/gta02-shadow.h> + +#include <mach/gpio.h> +#include <asm/mach-types.h> + +#include <mach/hardware.h> +#include <mach/cpu.h> + +#include <mach/gta02.h> +#include <linux/mfd/pcf50633/gpio.h> +#include <mach/regs-gpio.h> +#include <mach/regs-gpioj.h> + +int gta_gsm_interrupts; +EXPORT_SYMBOL(gta_gsm_interrupts); + +struct gta02pm_priv { + int gpio_ndl_gsm; +}; + +static struct gta02pm_priv gta02_gsm; + +static ssize_t gsm_read(struct device *dev, struct device_attribute *attr, + char *buf) +{ + if (!strcmp(attr->attr.name, "power_on")) { + if (pcf50633_gpio_get(gta02_pcf, PCF50633_GPIO2)) + goto out_1; + } else if (!strcmp(attr->attr.name, "download")) { + if (!s3c2410_gpio_getpin(GTA02_GPIO_nDL_GSM)) + goto out_1; + } else if (!strcmp(attr->attr.name, "flowcontrolled")) { + if (s3c2410_gpio_getcfg(S3C2410_GPH1) == S3C2410_GPIO_OUTPUT) + goto out_1; + } + + return strlcpy(buf, "0\n", 3); +out_1: + return strlcpy(buf, "1\n", 3); +} + +static void gsm_on_off(struct device *dev, int on) +{ + if (!on) { + /* + * Do not drive into powered-down GSM side + * GTA02 only, because on GTA01 maybe serial + * is used otherwise. + */ + s3c2410_gpio_cfgpin(S3C2410_GPH1, S3C2410_GPIO_INPUT); + s3c2410_gpio_cfgpin(S3C2410_GPH2, S3C2410_GPIO_INPUT); + + pcf50633_gpio_set(gta02_pcf, PCF50633_GPIO2, 0); + + return; + } + + /* allow UART to talk to GSM side now we will power it */ + s3c2410_gpio_cfgpin(S3C2410_GPH1, S3C2410_GPH1_nRTS0); + s3c2410_gpio_cfgpin(S3C2410_GPH2, S3C2410_GPH2_TXD0); + + pcf50633_gpio_set(gta02_pcf, PCF50633_GPIO2, 7); + + msleep(100); + + /* + * workaround for calypso firmware moko10 and earlier, + * without this it will leave IRQ line high after + * booting + */ + s3c2410_gpio_setpin(S3C2410_GPH1, 1); + s3c2410_gpio_cfgpin(S3C2410_GPH1, S3C2410_GPH1_OUTP); + msleep(1000); + s3c2410_gpio_cfgpin(S3C2410_GPH1, S3C2410_GPH1_nRTS0); + +} + +static ssize_t gsm_write(struct device *dev, struct device_attribute *attr, + const char *buf, size_t count) +{ + unsigned long on = simple_strtoul(buf, NULL, 10); + + if (!strcmp(attr->attr.name, "power_on")) { + gsm_on_off(dev, on); + + return count; + } + + if (!strcmp(attr->attr.name, "download")) { + /* + * the keyboard / buttons driver requests and enables + * the JACK_INSERT IRQ. We have to take care about + * not enabling and disabling the IRQ when it was + * already in that state or we get "unblanaced IRQ" + * kernel warnings and stack dumps. So we use the + * copy of the ndl_gsm state to figure out if we should + * enable or disable the jack interrupt + */ + if (on) { + if (gta02_gsm.gpio_ndl_gsm) + disable_irq(gpio_to_irq( + GTA02_GPIO_JACK_INSERT)); + } else { + if (!gta02_gsm.gpio_ndl_gsm) + enable_irq(gpio_to_irq( + GTA02_GPIO_JACK_INSERT)); + } + + gta02_gsm.gpio_ndl_gsm = !on; + s3c2410_gpio_setpin(GTA02_GPIO_nDL_GSM, !on); + + return count; + } + + if (!strcmp(attr->attr.name, "flowcontrolled")) { + if (on) { + gta_gsm_interrupts = 0; + s3c2410_gpio_setpin(S3C2410_GPH1, 1); + s3c2410_gpio_cfgpin(S3C2410_GPH1, S3C2410_GPH1_OUTP); + } else + s3c2410_gpio_cfgpin(S3C2410_GPH1, S3C2410_GPH1_nRTS0); + } + + return count; +} + +static DEVICE_ATTR(power_on, 0644, gsm_read, gsm_write); +static DEVICE_ATTR(reset, 0644, gsm_read, gsm_write); +static DEVICE_ATTR(download, 0644, gsm_read, gsm_write); +static DEVICE_ATTR(flowcontrolled, 0644, gsm_read, gsm_write); + +#ifdef CONFIG_PM + +static int gta02_gsm_resume(struct platform_device *pdev); +static int gta02_gsm_suspend(struct platform_device *pdev, pm_message_t state) +{ + /* GPIO state is saved/restored by S3C2410 core GPIO driver, so we + * don't need to do much here. */ + + /* If flowcontrol asserted, abort if GSM already interrupted */ + if (s3c2410_gpio_getcfg(S3C2410_GPH1) == S3C2410_GPIO_OUTPUT) { + if (gta_gsm_interrupts) + goto busy; + } + + /* disable DL GSM to prevent jack_insert becoming 'floating' */ + s3c2410_gpio_setpin(GTA02_GPIO_nDL_GSM, 1); + return 0; + +busy: + return -EBUSY; +} + +static int +gta02_gsm_suspend_late(struct platform_device *pdev, pm_message_t state) +{ + /* Last chance: abort if GSM already interrupted */ + if (s3c2410_gpio_getcfg(S3C2410_GPH1) == S3C2410_GPIO_OUTPUT) { + if (gta_gsm_interrupts) + return -EBUSY; + } + return 0; +} + +static int gta02_gsm_resume(struct platform_device *pdev) +{ + /* GPIO state is saved/restored by S3C2410 core GPIO driver, so we + * don't need to do much here. */ + + s3c2410_gpio_setpin(GTA02_GPIO_nDL_GSM, gta02_gsm.gpio_ndl_gsm); + + return 0; +} +#else +#define gta02_gsm_suspend NULL +#define gta02_gsm_suspend_late NULL +#define gta02_gsm_resume NULL +#endif /* CONFIG_PM */ + +static struct attribute *gta02_gsm_sysfs_entries[] = { + &dev_attr_power_on.attr, + &dev_attr_reset.attr, + &dev_attr_download.attr, + &dev_attr_flowcontrolled.attr, + NULL +}; + +static struct attribute_group gta02_gsm_attr_group = { + .name = NULL, + .attrs = gta02_gsm_sysfs_entries, +}; + +static int __init gta02_gsm_probe(struct platform_device *pdev) +{ + switch (S3C_SYSTEM_REV_ATAG) { + case GTA02v1_SYSTEM_REV: + case GTA02v2_SYSTEM_REV: + case GTA02v3_SYSTEM_REV: + case GTA02v4_SYSTEM_REV: + case GTA02v5_SYSTEM_REV: + case GTA02v6_SYSTEM_REV: + break; + default: + /* TODO: fail */ + dev_warn(&pdev->dev, "Unknown Neo1973 Revision 0x%x, " + "some PM features not available!!!\n", + system_rev); + break; + } + + /* note that download initially disabled, and enforce that */ + gta02_gsm.gpio_ndl_gsm = 1; + s3c2410_gpio_setpin(GTA02_GPIO_nDL_GSM, 1); + + /* GSM is to be initially off (at boot, or if this module inserted) */ + gsm_on_off(&pdev->dev, 0); + + return sysfs_create_group(&pdev->dev.kobj, >a02_gsm_attr_group); +} + +static int gta02_gsm_remove(struct platform_device *pdev) +{ + sysfs_remove_group(&pdev->dev.kobj, >a02_gsm_attr_group); + + return 0; +} + +static struct platform_driver gta02_gsm_driver = { + .probe = gta02_gsm_probe, + .remove = gta02_gsm_remove, + .suspend = gta02_gsm_suspend, + .suspend_late = gta02_gsm_suspend_late, + .resume = gta02_gsm_resume, + .driver = { + .name = "gta02-pm-gsm", + }, +}; + +static int __devinit gta02_gsm_init(void) +{ + return platform_driver_register(>a02_gsm_driver); +} + +static void gta02_gsm_exit(void) +{ + platform_driver_unregister(>a02_gsm_driver); +} + +module_init(gta02_gsm_init); +module_exit(gta02_gsm_exit); + +MODULE_LICENSE("GPL"); +MODULE_AUTHOR("Harald Welte <laforge@openmoko.org>"); +MODULE_DESCRIPTION("Openmoko Freerunner GSM Power Management"); |