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