Fixed MTP to work with TWRP

arch/x86/platform/olpc/Makefile

@@ -0,0 +1,5 @@
+obj-$(CONFIG_OLPC)		+= olpc.o olpc_ofw.o olpc_dt.o
+obj-$(CONFIG_OLPC_XO1_PM)		+= olpc-xo1-pm.o xo1-wakeup.o
+obj-$(CONFIG_OLPC_XO1_RTC)	+= olpc-xo1-rtc.o
+obj-$(CONFIG_OLPC_XO1_SCI)	+= olpc-xo1-sci.o
+obj-$(CONFIG_OLPC_XO15_SCI)	+= olpc-xo15-sci.o

arch/x86/platform/olpc/olpc-xo1-pm.c

@@ -0,0 +1,202 @@
+/*
+ * Support for power management features of the OLPC XO-1 laptop
+ *
+ * Copyright (C) 2010 Andres Salomon <dilinger@queued.net>
+ * Copyright (C) 2010 One Laptop per Child
+ * Copyright (C) 2006 Red Hat, Inc.
+ * Copyright (C) 2006 Advanced Micro Devices, Inc.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ */
+
+#include <linux/cs5535.h>
+#include <linux/platform_device.h>
+#include <linux/export.h>
+#include <linux/pm.h>
+#include <linux/mfd/core.h>
+#include <linux/suspend.h>
+#include <linux/olpc-ec.h>
+
+#include <asm/io.h>
+#include <asm/olpc.h>
+
+#define DRV_NAME "olpc-xo1-pm"
+
+static unsigned long acpi_base;
+static unsigned long pms_base;
+
+static u16 wakeup_mask = CS5536_PM_PWRBTN;
+
+static struct {
+	unsigned long address;
+	unsigned short segment;
+} ofw_bios_entry = { 0xF0000 + PAGE_OFFSET, __KERNEL_CS };
+
+/* Set bits in the wakeup mask */
+void olpc_xo1_pm_wakeup_set(u16 value)
+{
+	wakeup_mask |= value;
+}
+EXPORT_SYMBOL_GPL(olpc_xo1_pm_wakeup_set);
+
+/* Clear bits in the wakeup mask */
+void olpc_xo1_pm_wakeup_clear(u16 value)
+{
+	wakeup_mask &= ~value;
+}
+EXPORT_SYMBOL_GPL(olpc_xo1_pm_wakeup_clear);
+
+static int xo1_power_state_enter(suspend_state_t pm_state)
+{
+	unsigned long saved_sci_mask;
+
+	/* Only STR is supported */
+	if (pm_state != PM_SUSPEND_MEM)
+		return -EINVAL;
+
+	/*
+	 * Save SCI mask (this gets lost since PM1_EN is used as a mask for
+	 * wakeup events, which is not necessarily the same event set)
+	 */
+	saved_sci_mask = inl(acpi_base + CS5536_PM1_STS);
+	saved_sci_mask &= 0xffff0000;
+
+	/* Save CPU state */
+	do_olpc_suspend_lowlevel();
+
+	/* Resume path starts here */
+
+	/* Restore SCI mask (using dword access to CS5536_PM1_EN) */
+	outl(saved_sci_mask, acpi_base + CS5536_PM1_STS);
+
+	return 0;
+}
+
+asmlinkage __visible int xo1_do_sleep(u8 sleep_state)
+{
+	void *pgd_addr = __va(read_cr3());
+
+	/* Program wakeup mask (using dword access to CS5536_PM1_EN) */
+	outl(wakeup_mask << 16, acpi_base + CS5536_PM1_STS);
+
+	__asm__("movl %0,%%eax" : : "r" (pgd_addr));
+	__asm__("call *(%%edi); cld"
+		: : "D" (&ofw_bios_entry));
+	__asm__("movb $0x34, %al\n\t"
+		"outb %al, $0x70\n\t"
+		"movb $0x30, %al\n\t"
+		"outb %al, $0x71\n\t");
+	return 0;
+}
+
+static void xo1_power_off(void)
+{
+	printk(KERN_INFO "OLPC XO-1 power off sequence...\n");
+
+	/* Enable all of these controls with 0 delay */
+	outl(0x40000000, pms_base + CS5536_PM_SCLK);
+	outl(0x40000000, pms_base + CS5536_PM_IN_SLPCTL);
+	outl(0x40000000, pms_base + CS5536_PM_WKXD);
+	outl(0x40000000, pms_base + CS5536_PM_WKD);
+
+	/* Clear status bits (possibly unnecessary) */
+	outl(0x0002ffff, pms_base  + CS5536_PM_SSC);
+	outl(0xffffffff, acpi_base + CS5536_PM_GPE0_STS);
+
+	/* Write SLP_EN bit to start the machinery */
+	outl(0x00002000, acpi_base + CS5536_PM1_CNT);
+}
+
+static int xo1_power_state_valid(suspend_state_t pm_state)
+{
+	/* suspend-to-RAM only */
+	return pm_state == PM_SUSPEND_MEM;
+}
+
+static const struct platform_suspend_ops xo1_suspend_ops = {
+	.valid = xo1_power_state_valid,
+	.enter = xo1_power_state_enter,
+};
+
+static int xo1_pm_probe(struct platform_device *pdev)
+{
+	struct resource *res;
+	int err;
+
+	/* don't run on non-XOs */
+	if (!machine_is_olpc())
+		return -ENODEV;
+
+	err = mfd_cell_enable(pdev);
+	if (err)
+		return err;
+
+	res = platform_get_resource(pdev, IORESOURCE_IO, 0);
+	if (!res) {
+		dev_err(&pdev->dev, "can't fetch device resource info\n");
+		return -EIO;
+	}
+	if (strcmp(pdev->name, "cs5535-pms") == 0)
+		pms_base = res->start;
+	else if (strcmp(pdev->name, "olpc-xo1-pm-acpi") == 0)
+		acpi_base = res->start;
+
+	/* If we have both addresses, we can override the poweroff hook */
+	if (pms_base && acpi_base) {
+		suspend_set_ops(&xo1_suspend_ops);
+		pm_power_off = xo1_power_off;
+		printk(KERN_INFO "OLPC XO-1 support registered\n");
+	}
+
+	return 0;
+}
+
+static int xo1_pm_remove(struct platform_device *pdev)
+{
+	mfd_cell_disable(pdev);
+
+	if (strcmp(pdev->name, "cs5535-pms") == 0)
+		pms_base = 0;
+	else if (strcmp(pdev->name, "olpc-xo1-pm-acpi") == 0)
+		acpi_base = 0;
+
+	pm_power_off = NULL;
+	return 0;
+}
+
+static struct platform_driver cs5535_pms_driver = {
+	.driver = {
+		.name = "cs5535-pms",
+		.owner = THIS_MODULE,
+	},
+	.probe = xo1_pm_probe,
+	.remove = xo1_pm_remove,
+};
+
+static struct platform_driver cs5535_acpi_driver = {
+	.driver = {
+		.name = "olpc-xo1-pm-acpi",
+		.owner = THIS_MODULE,
+	},
+	.probe = xo1_pm_probe,
+	.remove = xo1_pm_remove,
+};
+
+static int __init xo1_pm_init(void)
+{
+	int r;
+
+	r = platform_driver_register(&cs5535_pms_driver);
+	if (r)
+		return r;
+
+	r = platform_driver_register(&cs5535_acpi_driver);
+	if (r)
+		platform_driver_unregister(&cs5535_pms_driver);
+
+	return r;
+}
+arch_initcall(xo1_pm_init);

arch/x86/platform/olpc/olpc-xo1-rtc.c

@@ -0,0 +1,81 @@
+/*
+ * Support for OLPC XO-1 Real Time Clock (RTC)
+ *
+ * Copyright (C) 2011 One Laptop per Child
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ */
+
+#include <linux/mc146818rtc.h>
+#include <linux/platform_device.h>
+#include <linux/rtc.h>
+#include <linux/of.h>
+
+#include <asm/msr.h>
+#include <asm/olpc.h>
+
+static void rtc_wake_on(struct device *dev)
+{
+	olpc_xo1_pm_wakeup_set(CS5536_PM_RTC);
+}
+
+static void rtc_wake_off(struct device *dev)
+{
+	olpc_xo1_pm_wakeup_clear(CS5536_PM_RTC);
+}
+
+static struct resource rtc_platform_resource[] = {
+	[0] = {
+		.start	= RTC_PORT(0),
+		.end	= RTC_PORT(1),
+		.flags	= IORESOURCE_IO,
+	},
+	[1] = {
+		.start	= RTC_IRQ,
+		.end	= RTC_IRQ,
+		.flags	= IORESOURCE_IRQ,
+	}
+};
+
+static struct cmos_rtc_board_info rtc_info = {
+	.rtc_day_alarm = 0,
+	.rtc_mon_alarm = 0,
+	.rtc_century = 0,
+	.wake_on = rtc_wake_on,
+	.wake_off = rtc_wake_off,
+};
+
+static struct platform_device xo1_rtc_device = {
+	.name = "rtc_cmos",
+	.id = -1,
+	.num_resources = ARRAY_SIZE(rtc_platform_resource),
+	.dev.platform_data = &rtc_info,
+	.resource = rtc_platform_resource,
+};
+
+static int __init xo1_rtc_init(void)
+{
+	int r;
+	struct device_node *node;
+
+	node = of_find_compatible_node(NULL, NULL, "olpc,xo1-rtc");
+	if (!node)
+		return 0;
+	of_node_put(node);
+
+	pr_info("olpc-xo1-rtc: Initializing OLPC XO-1 RTC\n");
+	rdmsrl(MSR_RTC_DOMA_OFFSET, rtc_info.rtc_day_alarm);
+	rdmsrl(MSR_RTC_MONA_OFFSET, rtc_info.rtc_mon_alarm);
+	rdmsrl(MSR_RTC_CEN_OFFSET, rtc_info.rtc_century);
+
+	r = platform_device_register(&xo1_rtc_device);
+	if (r)
+		return r;
+
+	device_init_wakeup(&xo1_rtc_device.dev, 1);
+	return 0;
+}
+arch_initcall(xo1_rtc_init);

arch/x86/platform/olpc/olpc-xo1-sci.c

@@ -0,0 +1,642 @@
+/*
+ * Support for OLPC XO-1 System Control Interrupts (SCI)
+ *
+ * Copyright (C) 2010 One Laptop per Child
+ * Copyright (C) 2006 Red Hat, Inc.
+ * Copyright (C) 2006 Advanced Micro Devices, Inc.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ */
+
+#include <linux/cs5535.h>
+#include <linux/device.h>
+#include <linux/gpio.h>
+#include <linux/input.h>
+#include <linux/interrupt.h>
+#include <linux/platform_device.h>
+#include <linux/pm.h>
+#include <linux/pm_wakeup.h>
+#include <linux/mfd/core.h>
+#include <linux/power_supply.h>
+#include <linux/suspend.h>
+#include <linux/workqueue.h>
+#include <linux/olpc-ec.h>
+
+#include <asm/io.h>
+#include <asm/msr.h>
+#include <asm/olpc.h>
+
+#define DRV_NAME	"olpc-xo1-sci"
+#define PFX		DRV_NAME ": "
+
+static unsigned long acpi_base;
+static struct input_dev *power_button_idev;
+static struct input_dev *ebook_switch_idev;
+static struct input_dev *lid_switch_idev;
+
+static int sci_irq;
+
+static bool lid_open;
+static bool lid_inverted;
+static int lid_wake_mode;
+
+enum lid_wake_modes {
+	LID_WAKE_ALWAYS,
+	LID_WAKE_OPEN,
+	LID_WAKE_CLOSE,
+};
+
+static const char * const lid_wake_mode_names[] = {
+	[LID_WAKE_ALWAYS] = "always",
+	[LID_WAKE_OPEN] = "open",
+	[LID_WAKE_CLOSE] = "close",
+};
+
+static void battery_status_changed(void)
+{
+	struct power_supply *psy = power_supply_get_by_name("olpc-battery");
+
+	if (psy) {
+		power_supply_changed(psy);
+		put_device(psy->dev);
+	}
+}
+
+static void ac_status_changed(void)
+{
+	struct power_supply *psy = power_supply_get_by_name("olpc-ac");
+
+	if (psy) {
+		power_supply_changed(psy);
+		put_device(psy->dev);
+	}
+}
+
+/* Report current ebook switch state through input layer */
+static void send_ebook_state(void)
+{
+	unsigned char state;
+
+	if (olpc_ec_cmd(EC_READ_EB_MODE, NULL, 0, &state, 1)) {
+		pr_err(PFX "failed to get ebook state\n");
+		return;
+	}
+
+	if (!!test_bit(SW_TABLET_MODE, ebook_switch_idev->sw) == state)
+		return; /* Nothing new to report. */
+
+	input_report_switch(ebook_switch_idev, SW_TABLET_MODE, state);
+	input_sync(ebook_switch_idev);
+	pm_wakeup_event(&ebook_switch_idev->dev, 0);
+}
+
+static void flip_lid_inverter(void)
+{
+	/* gpio is high; invert so we'll get l->h event interrupt */
+	if (lid_inverted)
+		cs5535_gpio_clear(OLPC_GPIO_LID, GPIO_INPUT_INVERT);
+	else
+		cs5535_gpio_set(OLPC_GPIO_LID, GPIO_INPUT_INVERT);
+	lid_inverted = !lid_inverted;
+}
+
+static void detect_lid_state(void)
+{
+	/*
+	 * the edge detector hookup on the gpio inputs on the geode is
+	 * odd, to say the least.  See http://dev.laptop.org/ticket/5703
+	 * for details, but in a nutshell:  we don't use the edge
+	 * detectors.  instead, we make use of an anomoly:  with the both
+	 * edge detectors turned off, we still get an edge event on a
+	 * positive edge transition.  to take advantage of this, we use the
+	 * front-end inverter to ensure that that's the edge we're always
+	 * going to see next.
+	 */
+
+	int state;
+
+	state = cs5535_gpio_isset(OLPC_GPIO_LID, GPIO_READ_BACK);
+	lid_open = !state ^ !lid_inverted; /* x ^^ y */
+	if (!state)
+		return;
+
+	flip_lid_inverter();
+}
+
+/* Report current lid switch state through input layer */
+static void send_lid_state(void)
+{
+	if (!!test_bit(SW_LID, lid_switch_idev->sw) == !lid_open)
+		return; /* Nothing new to report. */
+
+	input_report_switch(lid_switch_idev, SW_LID, !lid_open);
+	input_sync(lid_switch_idev);
+	pm_wakeup_event(&lid_switch_idev->dev, 0);
+}
+
+static ssize_t lid_wake_mode_show(struct device *dev,
+				  struct device_attribute *attr, char *buf)
+{
+	const char *mode = lid_wake_mode_names[lid_wake_mode];
+	return sprintf(buf, "%s\n", mode);
+}
+static ssize_t lid_wake_mode_set(struct device *dev,
+				 struct device_attribute *attr,
+				 const char *buf, size_t count)
+{
+	int i;
+	for (i = 0; i < ARRAY_SIZE(lid_wake_mode_names); i++) {
+		const char *mode = lid_wake_mode_names[i];
+		if (strlen(mode) != count || strncasecmp(mode, buf, count))
+			continue;
+
+		lid_wake_mode = i;
+		return count;
+	}
+	return -EINVAL;
+}
+static DEVICE_ATTR(lid_wake_mode, S_IWUSR | S_IRUGO, lid_wake_mode_show,
+		   lid_wake_mode_set);
+
+/*
+ * Process all items in the EC's SCI queue.
+ *
+ * This is handled in a workqueue because olpc_ec_cmd can be slow (and
+ * can even timeout).
+ *
+ * If propagate_events is false, the queue is drained without events being
+ * generated for the interrupts.
+ */
+static void process_sci_queue(bool propagate_events)
+{
+	int r;
+	u16 data;
+
+	do {
+		r = olpc_ec_sci_query(&data);
+		if (r || !data)
+			break;
+
+		pr_debug(PFX "SCI 0x%x received\n", data);
+
+		switch (data) {
+		case EC_SCI_SRC_BATERR:
+		case EC_SCI_SRC_BATSOC:
+		case EC_SCI_SRC_BATTERY:
+		case EC_SCI_SRC_BATCRIT:
+			battery_status_changed();
+			break;
+		case EC_SCI_SRC_ACPWR:
+			ac_status_changed();
+			break;
+		}
+
+		if (data == EC_SCI_SRC_EBOOK && propagate_events)
+			send_ebook_state();
+	} while (data);
+
+	if (r)
+		pr_err(PFX "Failed to clear SCI queue");
+}
+
+static void process_sci_queue_work(struct work_struct *work)
+{
+	process_sci_queue(true);
+}
+
+static DECLARE_WORK(sci_work, process_sci_queue_work);
+
+static irqreturn_t xo1_sci_intr(int irq, void *dev_id)
+{
+	struct platform_device *pdev = dev_id;
+	u32 sts;
+	u32 gpe;
+
+	sts = inl(acpi_base + CS5536_PM1_STS);
+	outl(sts | 0xffff, acpi_base + CS5536_PM1_STS);
+
+	gpe = inl(acpi_base + CS5536_PM_GPE0_STS);
+	outl(0xffffffff, acpi_base + CS5536_PM_GPE0_STS);
+
+	dev_dbg(&pdev->dev, "sts %x gpe %x\n", sts, gpe);
+
+	if (sts & CS5536_PWRBTN_FLAG) {
+		if (!(sts & CS5536_WAK_FLAG)) {
+			/* Only report power button input when it was pressed
+			 * during regular operation (as opposed to when it
+			 * was used to wake the system). */
+			input_report_key(power_button_idev, KEY_POWER, 1);
+			input_sync(power_button_idev);
+			input_report_key(power_button_idev, KEY_POWER, 0);
+			input_sync(power_button_idev);
+		}
+		/* Report the wakeup event in all cases. */
+		pm_wakeup_event(&power_button_idev->dev, 0);
+	}
+
+	if ((sts & (CS5536_RTC_FLAG | CS5536_WAK_FLAG)) ==
+			(CS5536_RTC_FLAG | CS5536_WAK_FLAG)) {
+		/* When the system is woken by the RTC alarm, report the
+		 * event on the rtc device. */
+		struct device *rtc = bus_find_device_by_name(
+			&platform_bus_type, NULL, "rtc_cmos");
+		if (rtc) {
+			pm_wakeup_event(rtc, 0);
+			put_device(rtc);
+		}
+	}
+
+	if (gpe & CS5536_GPIOM7_PME_FLAG) { /* EC GPIO */
+		cs5535_gpio_set(OLPC_GPIO_ECSCI, GPIO_NEGATIVE_EDGE_STS);
+		schedule_work(&sci_work);
+	}
+
+	cs5535_gpio_set(OLPC_GPIO_LID, GPIO_NEGATIVE_EDGE_STS);
+	cs5535_gpio_set(OLPC_GPIO_LID, GPIO_POSITIVE_EDGE_STS);
+	detect_lid_state();
+	send_lid_state();
+
+	return IRQ_HANDLED;
+}
+
+static int xo1_sci_suspend(struct platform_device *pdev, pm_message_t state)
+{
+	if (device_may_wakeup(&power_button_idev->dev))
+		olpc_xo1_pm_wakeup_set(CS5536_PM_PWRBTN);
+	else
+		olpc_xo1_pm_wakeup_clear(CS5536_PM_PWRBTN);
+
+	if (device_may_wakeup(&ebook_switch_idev->dev))
+		olpc_ec_wakeup_set(EC_SCI_SRC_EBOOK);
+	else
+		olpc_ec_wakeup_clear(EC_SCI_SRC_EBOOK);
+
+	if (!device_may_wakeup(&lid_switch_idev->dev)) {
+		cs5535_gpio_clear(OLPC_GPIO_LID, GPIO_EVENTS_ENABLE);
+	} else if ((lid_open && lid_wake_mode == LID_WAKE_OPEN) ||
+		   (!lid_open && lid_wake_mode == LID_WAKE_CLOSE)) {
+		flip_lid_inverter();
+
+		/* we may have just caused an event */
+		cs5535_gpio_set(OLPC_GPIO_LID, GPIO_NEGATIVE_EDGE_STS);
+		cs5535_gpio_set(OLPC_GPIO_LID, GPIO_POSITIVE_EDGE_STS);
+
+		cs5535_gpio_set(OLPC_GPIO_LID, GPIO_EVENTS_ENABLE);
+	}
+
+	return 0;
+}
+
+static int xo1_sci_resume(struct platform_device *pdev)
+{
+	/*
+	 * We don't know what may have happened while we were asleep.
+	 * Reestablish our lid setup so we're sure to catch all transitions.
+	 */
+	detect_lid_state();
+	send_lid_state();
+	cs5535_gpio_set(OLPC_GPIO_LID, GPIO_EVENTS_ENABLE);
+
+	/* Enable all EC events */
+	olpc_ec_mask_write(EC_SCI_SRC_ALL);
+
+	/* Power/battery status might have changed too */
+	battery_status_changed();
+	ac_status_changed();
+	return 0;
+}
+
+static int setup_sci_interrupt(struct platform_device *pdev)
+{
+	u32 lo, hi;
+	u32 sts;
+	int r;
+
+	rdmsr(0x51400020, lo, hi);
+	sci_irq = (lo >> 20) & 15;
+
+	if (sci_irq) {
+		dev_info(&pdev->dev, "SCI is mapped to IRQ %d\n", sci_irq);
+	} else {
+		/* Zero means masked */
+		dev_info(&pdev->dev, "SCI unmapped. Mapping to IRQ 3\n");
+		sci_irq = 3;
+		lo |= 0x00300000;
+		wrmsrl(0x51400020, lo);
+	}
+
+	/* Select level triggered in PIC */
+	if (sci_irq < 8) {
+		lo = inb(CS5536_PIC_INT_SEL1);
+		lo |= 1 << sci_irq;
+		outb(lo, CS5536_PIC_INT_SEL1);
+	} else {
+		lo = inb(CS5536_PIC_INT_SEL2);
+		lo |= 1 << (sci_irq - 8);
+		outb(lo, CS5536_PIC_INT_SEL2);
+	}
+
+	/* Enable interesting SCI events, and clear pending interrupts */
+	sts = inl(acpi_base + CS5536_PM1_STS);
+	outl(((CS5536_PM_PWRBTN | CS5536_PM_RTC) << 16) | 0xffff,
+	     acpi_base + CS5536_PM1_STS);
+
+	r = request_irq(sci_irq, xo1_sci_intr, 0, DRV_NAME, pdev);
+	if (r)
+		dev_err(&pdev->dev, "can't request interrupt\n");
+
+	return r;
+}
+
+static int setup_ec_sci(void)
+{
+	int r;
+
+	r = gpio_request(OLPC_GPIO_ECSCI, "OLPC-ECSCI");
+	if (r)
+		return r;
+
+	gpio_direction_input(OLPC_GPIO_ECSCI);
+
+	/* Clear pending EC SCI events */
+	cs5535_gpio_set(OLPC_GPIO_ECSCI, GPIO_NEGATIVE_EDGE_STS);
+	cs5535_gpio_set(OLPC_GPIO_ECSCI, GPIO_POSITIVE_EDGE_STS);
+
+	/*
+	 * Enable EC SCI events, and map them to both a PME and the SCI
+	 * interrupt.
+	 *
+	 * Ordinarily, in addition to functioning as GPIOs, Geode GPIOs can
+	 * be mapped to regular interrupts *or* Geode-specific Power
+	 * Management Events (PMEs) - events that bring the system out of
+	 * suspend. In this case, we want both of those things - the system
+	 * wakeup, *and* the ability to get an interrupt when an event occurs.
+	 *
+	 * To achieve this, we map the GPIO to a PME, and then we use one
+	 * of the many generic knobs on the CS5535 PIC to additionally map the
+	 * PME to the regular SCI interrupt line.
+	 */
+	cs5535_gpio_set(OLPC_GPIO_ECSCI, GPIO_EVENTS_ENABLE);
+
+	/* Set the SCI to cause a PME event on group 7 */
+	cs5535_gpio_setup_event(OLPC_GPIO_ECSCI, 7, 1);
+
+	/* And have group 7 also fire the SCI interrupt */
+	cs5535_pic_unreqz_select_high(7, sci_irq);
+
+	return 0;
+}
+
+static void free_ec_sci(void)
+{
+	gpio_free(OLPC_GPIO_ECSCI);
+}
+
+static int setup_lid_events(void)
+{
+	int r;
+
+	r = gpio_request(OLPC_GPIO_LID, "OLPC-LID");
+	if (r)
+		return r;
+
+	gpio_direction_input(OLPC_GPIO_LID);
+
+	cs5535_gpio_clear(OLPC_GPIO_LID, GPIO_INPUT_INVERT);
+	lid_inverted = 0;
+
+	/* Clear edge detection and event enable for now */
+	cs5535_gpio_clear(OLPC_GPIO_LID, GPIO_EVENTS_ENABLE);
+	cs5535_gpio_clear(OLPC_GPIO_LID, GPIO_NEGATIVE_EDGE_EN);
+	cs5535_gpio_clear(OLPC_GPIO_LID, GPIO_POSITIVE_EDGE_EN);
+	cs5535_gpio_set(OLPC_GPIO_LID, GPIO_NEGATIVE_EDGE_STS);
+	cs5535_gpio_set(OLPC_GPIO_LID, GPIO_POSITIVE_EDGE_STS);
+
+	/* Set the LID to cause an PME event on group 6 */
+	cs5535_gpio_setup_event(OLPC_GPIO_LID, 6, 1);
+
+	/* Set PME group 6 to fire the SCI interrupt */
+	cs5535_gpio_set_irq(6, sci_irq);
+
+	/* Enable the event */
+	cs5535_gpio_set(OLPC_GPIO_LID, GPIO_EVENTS_ENABLE);
+
+	return 0;
+}
+
+static void free_lid_events(void)
+{
+	gpio_free(OLPC_GPIO_LID);
+}
+
+static int setup_power_button(struct platform_device *pdev)
+{
+	int r;
+
+	power_button_idev = input_allocate_device();
+	if (!power_button_idev)
+		return -ENOMEM;
+
+	power_button_idev->name = "Power Button";
+	power_button_idev->phys = DRV_NAME "/input0";
+	set_bit(EV_KEY, power_button_idev->evbit);
+	set_bit(KEY_POWER, power_button_idev->keybit);
+
+	power_button_idev->dev.parent = &pdev->dev;
+	device_init_wakeup(&power_button_idev->dev, 1);
+
+	r = input_register_device(power_button_idev);
+	if (r) {
+		dev_err(&pdev->dev, "failed to register power button: %d\n", r);
+		input_free_device(power_button_idev);
+	}
+
+	return r;
+}
+
+static void free_power_button(void)
+{
+	input_unregister_device(power_button_idev);
+}
+
+static int setup_ebook_switch(struct platform_device *pdev)
+{
+	int r;
+
+	ebook_switch_idev = input_allocate_device();
+	if (!ebook_switch_idev)
+		return -ENOMEM;
+
+	ebook_switch_idev->name = "EBook Switch";
+	ebook_switch_idev->phys = DRV_NAME "/input1";
+	set_bit(EV_SW, ebook_switch_idev->evbit);
+	set_bit(SW_TABLET_MODE, ebook_switch_idev->swbit);
+
+	ebook_switch_idev->dev.parent = &pdev->dev;
+	device_set_wakeup_capable(&ebook_switch_idev->dev, true);
+
+	r = input_register_device(ebook_switch_idev);
+	if (r) {
+		dev_err(&pdev->dev, "failed to register ebook switch: %d\n", r);
+		input_free_device(ebook_switch_idev);
+	}
+
+	return r;
+}
+
+static void free_ebook_switch(void)
+{
+	input_unregister_device(ebook_switch_idev);
+}
+
+static int setup_lid_switch(struct platform_device *pdev)
+{
+	int r;
+
+	lid_switch_idev = input_allocate_device();
+	if (!lid_switch_idev)
+		return -ENOMEM;
+
+	lid_switch_idev->name = "Lid Switch";
+	lid_switch_idev->phys = DRV_NAME "/input2";
+	set_bit(EV_SW, lid_switch_idev->evbit);
+	set_bit(SW_LID, lid_switch_idev->swbit);
+
+	lid_switch_idev->dev.parent = &pdev->dev;
+	device_set_wakeup_capable(&lid_switch_idev->dev, true);
+
+	r = input_register_device(lid_switch_idev);
+	if (r) {
+		dev_err(&pdev->dev, "failed to register lid switch: %d\n", r);
+		goto err_register;
+	}
+
+	r = device_create_file(&lid_switch_idev->dev, &dev_attr_lid_wake_mode);
+	if (r) {
+		dev_err(&pdev->dev, "failed to create wake mode attr: %d\n", r);
+		goto err_create_attr;
+	}
+
+	return 0;
+
+err_create_attr:
+	input_unregister_device(lid_switch_idev);
+	lid_switch_idev = NULL;
+err_register:
+	input_free_device(lid_switch_idev);
+	return r;
+}
+
+static void free_lid_switch(void)
+{
+	device_remove_file(&lid_switch_idev->dev, &dev_attr_lid_wake_mode);
+	input_unregister_device(lid_switch_idev);
+}
+
+static int xo1_sci_probe(struct platform_device *pdev)
+{
+	struct resource *res;
+	int r;
+
+	/* don't run on non-XOs */
+	if (!machine_is_olpc())
+		return -ENODEV;
+
+	r = mfd_cell_enable(pdev);
+	if (r)
+		return r;
+
+	res = platform_get_resource(pdev, IORESOURCE_IO, 0);
+	if (!res) {
+		dev_err(&pdev->dev, "can't fetch device resource info\n");
+		return -EIO;
+	}
+	acpi_base = res->start;
+
+	r = setup_power_button(pdev);
+	if (r)
+		return r;
+
+	r = setup_ebook_switch(pdev);
+	if (r)
+		goto err_ebook;
+
+	r = setup_lid_switch(pdev);
+	if (r)
+		goto err_lid;
+
+	r = setup_lid_events();
+	if (r)
+		goto err_lidevt;
+
+	r = setup_ec_sci();
+	if (r)
+		goto err_ecsci;
+
+	/* Enable PME generation for EC-generated events */
+	outl(CS5536_GPIOM6_PME_EN | CS5536_GPIOM7_PME_EN,
+		acpi_base + CS5536_PM_GPE0_EN);
+
+	/* Clear pending events */
+	outl(0xffffffff, acpi_base + CS5536_PM_GPE0_STS);
+	process_sci_queue(false);
+
+	/* Initial sync */
+	send_ebook_state();
+	detect_lid_state();
+	send_lid_state();
+
+	r = setup_sci_interrupt(pdev);
+	if (r)
+		goto err_sci;
+
+	/* Enable all EC events */
+	olpc_ec_mask_write(EC_SCI_SRC_ALL);
+
+	return r;
+
+err_sci:
+	free_ec_sci();
+err_ecsci:
+	free_lid_events();
+err_lidevt:
+	free_lid_switch();
+err_lid:
+	free_ebook_switch();
+err_ebook:
+	free_power_button();
+	return r;
+}
+
+static int xo1_sci_remove(struct platform_device *pdev)
+{
+	mfd_cell_disable(pdev);
+	free_irq(sci_irq, pdev);
+	cancel_work_sync(&sci_work);
+	free_ec_sci();
+	free_lid_events();
+	free_lid_switch();
+	free_ebook_switch();
+	free_power_button();
+	acpi_base = 0;
+	return 0;
+}
+
+static struct platform_driver xo1_sci_driver = {
+	.driver = {
+		.name = "olpc-xo1-sci-acpi",
+	},
+	.probe = xo1_sci_probe,
+	.remove = xo1_sci_remove,
+	.suspend = xo1_sci_suspend,
+	.resume = xo1_sci_resume,
+};
+
+static int __init xo1_sci_init(void)
+{
+	return platform_driver_register(&xo1_sci_driver);
+}
+arch_initcall(xo1_sci_init);

arch/x86/platform/olpc/olpc-xo15-sci.c

@@ -0,0 +1,233 @@
+/*
+ * Support for OLPC XO-1.5 System Control Interrupts (SCI)
+ *
+ * Copyright (C) 2009-2010 One Laptop per Child
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ */
+
+#include <linux/device.h>
+#include <linux/slab.h>
+#include <linux/workqueue.h>
+#include <linux/power_supply.h>
+#include <linux/olpc-ec.h>
+
+#include <linux/acpi.h>
+#include <asm/olpc.h>
+
+#define DRV_NAME			"olpc-xo15-sci"
+#define PFX				DRV_NAME ": "
+#define XO15_SCI_CLASS			DRV_NAME
+#define XO15_SCI_DEVICE_NAME		"OLPC XO-1.5 SCI"
+
+static unsigned long			xo15_sci_gpe;
+static bool				lid_wake_on_close;
+
+/*
+ * The normal ACPI LID wakeup behavior is wake-on-open, but not
+ * wake-on-close. This is implemented as standard by the XO-1.5 DSDT.
+ *
+ * We provide here a sysfs attribute that will additionally enable
+ * wake-on-close behavior. This is useful (e.g.) when we oportunistically
+ * suspend with the display running; if the lid is then closed, we want to
+ * wake up to turn the display off.
+ *
+ * This is controlled through a custom method in the XO-1.5 DSDT.
+ */
+static int set_lid_wake_behavior(bool wake_on_close)
+{
+	acpi_status status;
+
+	status = acpi_execute_simple_method(NULL, "\\_SB.PCI0.LID.LIDW", wake_on_close);
+	if (ACPI_FAILURE(status)) {
+		pr_warning(PFX "failed to set lid behavior\n");
+		return 1;
+	}
+
+	lid_wake_on_close = wake_on_close;
+
+	return 0;
+}
+
+static ssize_t
+lid_wake_on_close_show(struct kobject *s, struct kobj_attribute *attr, char *buf)
+{
+	return sprintf(buf, "%u\n", lid_wake_on_close);
+}
+
+static ssize_t lid_wake_on_close_store(struct kobject *s,
+				       struct kobj_attribute *attr,
+				       const char *buf, size_t n)
+{
+	unsigned int val;
+
+	if (sscanf(buf, "%u", &val) != 1)
+		return -EINVAL;
+
+	set_lid_wake_behavior(!!val);
+
+	return n;
+}
+
+static struct kobj_attribute lid_wake_on_close_attr =
+	__ATTR(lid_wake_on_close, 0644,
+	       lid_wake_on_close_show,
+	       lid_wake_on_close_store);
+
+static void battery_status_changed(void)
+{
+	struct power_supply *psy = power_supply_get_by_name("olpc-battery");
+
+	if (psy) {
+		power_supply_changed(psy);
+		put_device(psy->dev);
+	}
+}
+
+static void ac_status_changed(void)
+{
+	struct power_supply *psy = power_supply_get_by_name("olpc-ac");
+
+	if (psy) {
+		power_supply_changed(psy);
+		put_device(psy->dev);
+	}
+}
+
+static void process_sci_queue(void)
+{
+	u16 data;
+	int r;
+
+	do {
+		r = olpc_ec_sci_query(&data);
+		if (r || !data)
+			break;
+
+		pr_debug(PFX "SCI 0x%x received\n", data);
+
+		switch (data) {
+		case EC_SCI_SRC_BATERR:
+		case EC_SCI_SRC_BATSOC:
+		case EC_SCI_SRC_BATTERY:
+		case EC_SCI_SRC_BATCRIT:
+			battery_status_changed();
+			break;
+		case EC_SCI_SRC_ACPWR:
+			ac_status_changed();
+			break;
+		}
+	} while (data);
+
+	if (r)
+		pr_err(PFX "Failed to clear SCI queue");
+}
+
+static void process_sci_queue_work(struct work_struct *work)
+{
+	process_sci_queue();
+}
+
+static DECLARE_WORK(sci_work, process_sci_queue_work);
+
+static u32 xo15_sci_gpe_handler(acpi_handle gpe_device, u32 gpe, void *context)
+{
+	schedule_work(&sci_work);
+	return ACPI_INTERRUPT_HANDLED | ACPI_REENABLE_GPE;
+}
+
+static int xo15_sci_add(struct acpi_device *device)
+{
+	unsigned long long tmp;
+	acpi_status status;
+	int r;
+
+	if (!device)
+		return -EINVAL;
+
+	strcpy(acpi_device_name(device), XO15_SCI_DEVICE_NAME);
+	strcpy(acpi_device_class(device), XO15_SCI_CLASS);
+
+	/* Get GPE bit assignment (EC events). */
+	status = acpi_evaluate_integer(device->handle, "_GPE", NULL, &tmp);
+	if (ACPI_FAILURE(status))
+		return -EINVAL;
+
+	xo15_sci_gpe = tmp;
+	status = acpi_install_gpe_handler(NULL, xo15_sci_gpe,
+					  ACPI_GPE_EDGE_TRIGGERED,
+					  xo15_sci_gpe_handler, device);
+	if (ACPI_FAILURE(status))
+		return -ENODEV;
+
+	dev_info(&device->dev, "Initialized, GPE = 0x%lx\n", xo15_sci_gpe);
+
+	r = sysfs_create_file(&device->dev.kobj, &lid_wake_on_close_attr.attr);
+	if (r)
+		goto err_sysfs;
+
+	/* Flush queue, and enable all SCI events */
+	process_sci_queue();
+	olpc_ec_mask_write(EC_SCI_SRC_ALL);
+
+	acpi_enable_gpe(NULL, xo15_sci_gpe);
+
+	/* Enable wake-on-EC */
+	if (device->wakeup.flags.valid)
+		device_init_wakeup(&device->dev, true);
+
+	return 0;
+
+err_sysfs:
+	acpi_remove_gpe_handler(NULL, xo15_sci_gpe, xo15_sci_gpe_handler);
+	cancel_work_sync(&sci_work);
+	return r;
+}
+
+static int xo15_sci_remove(struct acpi_device *device)
+{
+	acpi_disable_gpe(NULL, xo15_sci_gpe);
+	acpi_remove_gpe_handler(NULL, xo15_sci_gpe, xo15_sci_gpe_handler);
+	cancel_work_sync(&sci_work);
+	sysfs_remove_file(&device->dev.kobj, &lid_wake_on_close_attr.attr);
+	return 0;
+}
+
+static int xo15_sci_resume(struct device *dev)
+{
+	/* Enable all EC events */
+	olpc_ec_mask_write(EC_SCI_SRC_ALL);
+
+	/* Power/battery status might have changed */
+	battery_status_changed();
+	ac_status_changed();
+
+	return 0;
+}
+
+static SIMPLE_DEV_PM_OPS(xo15_sci_pm, NULL, xo15_sci_resume);
+
+static const struct acpi_device_id xo15_sci_device_ids[] = {
+	{"XO15EC", 0},
+	{"", 0},
+};
+
+static struct acpi_driver xo15_sci_drv = {
+	.name = DRV_NAME,
+	.class = XO15_SCI_CLASS,
+	.ids = xo15_sci_device_ids,
+	.ops = {
+		.add = xo15_sci_add,
+		.remove = xo15_sci_remove,
+	},
+	.drv.pm = &xo15_sci_pm,
+};
+
+static int __init xo15_sci_init(void)
+{
+	return acpi_bus_register_driver(&xo15_sci_drv);
+}
+device_initcall(xo15_sci_init);

arch/x86/platform/olpc/olpc.c

@@ -0,0 +1,410 @@
+/*
+ * Support for the OLPC DCON and OLPC EC access
+ *
+ * Copyright © 2006  Advanced Micro Devices, Inc.
+ * Copyright © 2007-2008  Andres Salomon <dilinger@debian.org>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ */
+
+#include <linux/kernel.h>
+#include <linux/init.h>
+#include <linux/module.h>
+#include <linux/delay.h>
+#include <linux/io.h>
+#include <linux/string.h>
+#include <linux/platform_device.h>
+#include <linux/of.h>
+#include <linux/syscore_ops.h>
+#include <linux/mutex.h>
+#include <linux/olpc-ec.h>
+
+#include <asm/geode.h>
+#include <asm/setup.h>
+#include <asm/olpc.h>
+#include <asm/olpc_ofw.h>
+
+struct olpc_platform_t olpc_platform_info;
+EXPORT_SYMBOL_GPL(olpc_platform_info);
+
+/* EC event mask to be applied during suspend (defining wakeup sources). */
+static u16 ec_wakeup_mask;
+
+/* what the timeout *should* be (in ms) */
+#define EC_BASE_TIMEOUT 20
+
+/* the timeout that bugs in the EC might force us to actually use */
+static int ec_timeout = EC_BASE_TIMEOUT;
+
+static int __init olpc_ec_timeout_set(char *str)
+{
+	if (get_option(&str, &ec_timeout) != 1) {
+		ec_timeout = EC_BASE_TIMEOUT;
+		printk(KERN_ERR "olpc-ec:  invalid argument to "
+				"'olpc_ec_timeout=', ignoring!\n");
+	}
+	printk(KERN_DEBUG "olpc-ec:  using %d ms delay for EC commands.\n",
+			ec_timeout);
+	return 1;
+}
+__setup("olpc_ec_timeout=", olpc_ec_timeout_set);
+
+/*
+ * These {i,o}bf_status functions return whether the buffers are full or not.
+ */
+
+static inline unsigned int ibf_status(unsigned int port)
+{
+	return !!(inb(port) & 0x02);
+}
+
+static inline unsigned int obf_status(unsigned int port)
+{
+	return inb(port) & 0x01;
+}
+
+#define wait_on_ibf(p, d) __wait_on_ibf(__LINE__, (p), (d))
+static int __wait_on_ibf(unsigned int line, unsigned int port, int desired)
+{
+	unsigned int timeo;
+	int state = ibf_status(port);
+
+	for (timeo = ec_timeout; state != desired && timeo; timeo--) {
+		mdelay(1);
+		state = ibf_status(port);
+	}
+
+	if ((state == desired) && (ec_timeout > EC_BASE_TIMEOUT) &&
+			timeo < (ec_timeout - EC_BASE_TIMEOUT)) {
+		printk(KERN_WARNING "olpc-ec:  %d: waited %u ms for IBF!\n",
+				line, ec_timeout - timeo);
+	}
+
+	return !(state == desired);
+}
+
+#define wait_on_obf(p, d) __wait_on_obf(__LINE__, (p), (d))
+static int __wait_on_obf(unsigned int line, unsigned int port, int desired)
+{
+	unsigned int timeo;
+	int state = obf_status(port);
+
+	for (timeo = ec_timeout; state != desired && timeo; timeo--) {
+		mdelay(1);
+		state = obf_status(port);
+	}
+
+	if ((state == desired) && (ec_timeout > EC_BASE_TIMEOUT) &&
+			timeo < (ec_timeout - EC_BASE_TIMEOUT)) {
+		printk(KERN_WARNING "olpc-ec:  %d: waited %u ms for OBF!\n",
+				line, ec_timeout - timeo);
+	}
+
+	return !(state == desired);
+}
+
+/*
+ * This allows the kernel to run Embedded Controller commands.  The EC is
+ * documented at <http://wiki.laptop.org/go/Embedded_controller>, and the
+ * available EC commands are here:
+ * <http://wiki.laptop.org/go/Ec_specification>.  Unfortunately, while
+ * OpenFirmware's source is available, the EC's is not.
+ */
+static int olpc_xo1_ec_cmd(u8 cmd, u8 *inbuf, size_t inlen, u8 *outbuf,
+		size_t outlen, void *arg)
+{
+	int ret = -EIO;
+	int i;
+	int restarts = 0;
+
+	/* Clear OBF */
+	for (i = 0; i < 10 && (obf_status(0x6c) == 1); i++)
+		inb(0x68);
+	if (i == 10) {
+		printk(KERN_ERR "olpc-ec:  timeout while attempting to "
+				"clear OBF flag!\n");
+		goto err;
+	}
+
+	if (wait_on_ibf(0x6c, 0)) {
+		printk(KERN_ERR "olpc-ec:  timeout waiting for EC to "
+				"quiesce!\n");
+		goto err;
+	}
+
+restart:
+	/*
+	 * Note that if we time out during any IBF checks, that's a failure;
+	 * we have to return.  There's no way for the kernel to clear that.
+	 *
+	 * If we time out during an OBF check, we can restart the command;
+	 * reissuing it will clear the OBF flag, and we should be alright.
+	 * The OBF flag will sometimes misbehave due to what we believe
+	 * is a hardware quirk..
+	 */
+	pr_devel("olpc-ec:  running cmd 0x%x\n", cmd);
+	outb(cmd, 0x6c);
+
+	if (wait_on_ibf(0x6c, 0)) {
+		printk(KERN_ERR "olpc-ec:  timeout waiting for EC to read "
+				"command!\n");
+		goto err;
+	}
+
+	if (inbuf && inlen) {
+		/* write data to EC */
+		for (i = 0; i < inlen; i++) {
+			pr_devel("olpc-ec:  sending cmd arg 0x%x\n", inbuf[i]);
+			outb(inbuf[i], 0x68);
+			if (wait_on_ibf(0x6c, 0)) {
+				printk(KERN_ERR "olpc-ec:  timeout waiting for"
+						" EC accept data!\n");
+				goto err;
+			}
+		}
+	}
+	if (outbuf && outlen) {
+		/* read data from EC */
+		for (i = 0; i < outlen; i++) {
+			if (wait_on_obf(0x6c, 1)) {
+				printk(KERN_ERR "olpc-ec:  timeout waiting for"
+						" EC to provide data!\n");
+				if (restarts++ < 10)
+					goto restart;
+				goto err;
+			}
+			outbuf[i] = inb(0x68);
+			pr_devel("olpc-ec:  received 0x%x\n", outbuf[i]);
+		}
+	}
+
+	ret = 0;
+err:
+	return ret;
+}
+
+void olpc_ec_wakeup_set(u16 value)
+{
+	ec_wakeup_mask |= value;
+}
+EXPORT_SYMBOL_GPL(olpc_ec_wakeup_set);
+
+void olpc_ec_wakeup_clear(u16 value)
+{
+	ec_wakeup_mask &= ~value;
+}
+EXPORT_SYMBOL_GPL(olpc_ec_wakeup_clear);
+
+/*
+ * Returns true if the compile and runtime configurations allow for EC events
+ * to wake the system.
+ */
+bool olpc_ec_wakeup_available(void)
+{
+	if (!machine_is_olpc())
+		return false;
+
+	/*
+	 * XO-1 EC wakeups are available when olpc-xo1-sci driver is
+	 * compiled in
+	 */
+#ifdef CONFIG_OLPC_XO1_SCI
+	if (olpc_platform_info.boardrev < olpc_board_pre(0xd0)) /* XO-1 */
+		return true;
+#endif
+
+	/*
+	 * XO-1.5 EC wakeups are available when olpc-xo15-sci driver is
+	 * compiled in
+	 */
+#ifdef CONFIG_OLPC_XO15_SCI
+	if (olpc_platform_info.boardrev >= olpc_board_pre(0xd0)) /* XO-1.5 */
+		return true;
+#endif
+
+	return false;
+}
+EXPORT_SYMBOL_GPL(olpc_ec_wakeup_available);
+
+int olpc_ec_mask_write(u16 bits)
+{
+	if (olpc_platform_info.flags & OLPC_F_EC_WIDE_SCI) {
+		__be16 ec_word = cpu_to_be16(bits);
+		return olpc_ec_cmd(EC_WRITE_EXT_SCI_MASK, (void *) &ec_word, 2,
+				   NULL, 0);
+	} else {
+		unsigned char ec_byte = bits & 0xff;
+		return olpc_ec_cmd(EC_WRITE_SCI_MASK, &ec_byte, 1, NULL, 0);
+	}
+}
+EXPORT_SYMBOL_GPL(olpc_ec_mask_write);
+
+int olpc_ec_sci_query(u16 *sci_value)
+{
+	int ret;
+
+	if (olpc_platform_info.flags & OLPC_F_EC_WIDE_SCI) {
+		__be16 ec_word;
+		ret = olpc_ec_cmd(EC_EXT_SCI_QUERY,
+			NULL, 0, (void *) &ec_word, 2);
+		if (ret == 0)
+			*sci_value = be16_to_cpu(ec_word);
+	} else {
+		unsigned char ec_byte;
+		ret = olpc_ec_cmd(EC_SCI_QUERY, NULL, 0, &ec_byte, 1);
+		if (ret == 0)
+			*sci_value = ec_byte;
+	}
+
+	return ret;
+}
+EXPORT_SYMBOL_GPL(olpc_ec_sci_query);
+
+static bool __init check_ofw_architecture(struct device_node *root)
+{
+	const char *olpc_arch;
+	int propsize;
+
+	olpc_arch = of_get_property(root, "architecture", &propsize);
+	return propsize == 5 && strncmp("OLPC", olpc_arch, 5) == 0;
+}
+
+static u32 __init get_board_revision(struct device_node *root)
+{
+	int propsize;
+	const __be32 *rev;
+
+	rev = of_get_property(root, "board-revision-int", &propsize);
+	if (propsize != 4)
+		return 0;
+
+	return be32_to_cpu(*rev);
+}
+
+static bool __init platform_detect(void)
+{
+	struct device_node *root = of_find_node_by_path("/");
+	bool success;
+
+	if (!root)
+		return false;
+
+	success = check_ofw_architecture(root);
+	if (success) {
+		olpc_platform_info.boardrev = get_board_revision(root);
+		olpc_platform_info.flags |= OLPC_F_PRESENT;
+	}
+
+	of_node_put(root);
+	return success;
+}
+
+static int __init add_xo1_platform_devices(void)
+{
+	struct platform_device *pdev;
+
+	pdev = platform_device_register_simple("xo1-rfkill", -1, NULL, 0);
+	if (IS_ERR(pdev))
+		return PTR_ERR(pdev);
+
+	pdev = platform_device_register_simple("olpc-xo1", -1, NULL, 0);
+	if (IS_ERR(pdev))
+		return PTR_ERR(pdev);
+
+	return 0;
+}
+
+static int olpc_xo1_ec_probe(struct platform_device *pdev)
+{
+	/* get the EC revision */
+	olpc_ec_cmd(EC_FIRMWARE_REV, NULL, 0,
+			(unsigned char *) &olpc_platform_info.ecver, 1);
+
+	/* EC version 0x5f adds support for wide SCI mask */
+	if (olpc_platform_info.ecver >= 0x5f)
+		olpc_platform_info.flags |= OLPC_F_EC_WIDE_SCI;
+
+	pr_info("OLPC board revision %s%X (EC=%x)\n",
+			((olpc_platform_info.boardrev & 0xf) < 8) ? "pre" : "",
+			olpc_platform_info.boardrev >> 4,
+			olpc_platform_info.ecver);
+
+	return 0;
+}
+static int olpc_xo1_ec_suspend(struct platform_device *pdev)
+{
+	olpc_ec_mask_write(ec_wakeup_mask);
+
+	/*
+	 * Squelch SCIs while suspended.  This is a fix for
+	 * <http://dev.laptop.org/ticket/1835>.
+	 */
+	return olpc_ec_cmd(EC_SET_SCI_INHIBIT, NULL, 0, NULL, 0);
+}
+
+static int olpc_xo1_ec_resume(struct platform_device *pdev)
+{
+	/* Tell the EC to stop inhibiting SCIs */
+	olpc_ec_cmd(EC_SET_SCI_INHIBIT_RELEASE, NULL, 0, NULL, 0);
+
+	/*
+	 * Tell the wireless module to restart USB communication.
+	 * Must be done twice.
+	 */
+	olpc_ec_cmd(EC_WAKE_UP_WLAN, NULL, 0, NULL, 0);
+	olpc_ec_cmd(EC_WAKE_UP_WLAN, NULL, 0, NULL, 0);
+
+	return 0;
+}
+
+static struct olpc_ec_driver ec_xo1_driver = {
+	.probe = olpc_xo1_ec_probe,
+	.suspend = olpc_xo1_ec_suspend,
+	.resume = olpc_xo1_ec_resume,
+	.ec_cmd = olpc_xo1_ec_cmd,
+};
+
+static struct olpc_ec_driver ec_xo1_5_driver = {
+	.probe = olpc_xo1_ec_probe,
+	.ec_cmd = olpc_xo1_ec_cmd,
+};
+
+static int __init olpc_init(void)
+{
+	int r = 0;
+
+	if (!olpc_ofw_present() || !platform_detect())
+		return 0;
+
+	/* register the XO-1 and 1.5-specific EC handler */
+	if (olpc_platform_info.boardrev < olpc_board_pre(0xd0))	/* XO-1 */
+		olpc_ec_driver_register(&ec_xo1_driver, NULL);
+	else
+		olpc_ec_driver_register(&ec_xo1_5_driver, NULL);
+	platform_device_register_simple("olpc-ec", -1, NULL, 0);
+
+	/* assume B1 and above models always have a DCON */
+	if (olpc_board_at_least(olpc_board(0xb1)))
+		olpc_platform_info.flags |= OLPC_F_DCON;
+
+#ifdef CONFIG_PCI_OLPC
+	/* If the VSA exists let it emulate PCI, if not emulate in kernel.
+	 * XO-1 only. */
+	if (olpc_platform_info.boardrev < olpc_board_pre(0xd0) &&
+			!cs5535_has_vsa2())
+		x86_init.pci.arch_init = pci_olpc_init;
+#endif
+
+	if (olpc_platform_info.boardrev < olpc_board_pre(0xd0)) { /* XO-1 */
+		r = add_xo1_platform_devices();
+		if (r)
+			return r;
+	}
+
+	return 0;
+}
+
+postcore_initcall(olpc_init);

arch/x86/platform/olpc/olpc_dt.c

@@ -0,0 +1,304 @@
+/*
+ * OLPC-specific OFW device tree support code.
+ *
+ * Paul Mackerras	August 1996.
+ * Copyright (C) 1996-2005 Paul Mackerras.
+ *
+ *  Adapted for 64bit PowerPC by Dave Engebretsen and Peter Bergner.
+ *    {engebret|bergner}@us.ibm.com
+ *
+ *  Adapted for sparc by David S. Miller davem@davemloft.net
+ *  Adapted for x86/OLPC by Andres Salomon <dilinger@queued.net>
+ *
+ *      This program is free software; you can redistribute it and/or
+ *      modify it under the terms of the GNU General Public License
+ *      as published by the Free Software Foundation; either version
+ *      2 of the License, or (at your option) any later version.
+ */
+
+#include <linux/kernel.h>
+#include <linux/bootmem.h>
+#include <linux/of.h>
+#include <linux/of_platform.h>
+#include <linux/of_pdt.h>
+#include <asm/olpc.h>
+#include <asm/olpc_ofw.h>
+
+static phandle __init olpc_dt_getsibling(phandle node)
+{
+	const void *args[] = { (void *)node };
+	void *res[] = { &node };
+
+	if ((s32)node == -1)
+		return 0;
+
+	if (olpc_ofw("peer", args, res) || (s32)node == -1)
+		return 0;
+
+	return node;
+}
+
+static phandle __init olpc_dt_getchild(phandle node)
+{
+	const void *args[] = { (void *)node };
+	void *res[] = { &node };
+
+	if ((s32)node == -1)
+		return 0;
+
+	if (olpc_ofw("child", args, res) || (s32)node == -1) {
+		pr_err("PROM: %s: fetching child failed!\n", __func__);
+		return 0;
+	}
+
+	return node;
+}
+
+static int __init olpc_dt_getproplen(phandle node, const char *prop)
+{
+	const void *args[] = { (void *)node, prop };
+	int len;
+	void *res[] = { &len };
+
+	if ((s32)node == -1)
+		return -1;
+
+	if (olpc_ofw("getproplen", args, res)) {
+		pr_err("PROM: %s: getproplen failed!\n", __func__);
+		return -1;
+	}
+
+	return len;
+}
+
+static int __init olpc_dt_getproperty(phandle node, const char *prop,
+		char *buf, int bufsize)
+{
+	int plen;
+
+	plen = olpc_dt_getproplen(node, prop);
+	if (plen > bufsize || plen < 1) {
+		return -1;
+	} else {
+		const void *args[] = { (void *)node, prop, buf, (void *)plen };
+		void *res[] = { &plen };
+
+		if (olpc_ofw("getprop", args, res)) {
+			pr_err("PROM: %s: getprop failed!\n", __func__);
+			return -1;
+		}
+	}
+
+	return plen;
+}
+
+static int __init olpc_dt_nextprop(phandle node, char *prev, char *buf)
+{
+	const void *args[] = { (void *)node, prev, buf };
+	int success;
+	void *res[] = { &success };
+
+	buf[0] = '\0';
+
+	if ((s32)node == -1)
+		return -1;
+
+	if (olpc_ofw("nextprop", args, res) || success != 1)
+		return -1;
+
+	return 0;
+}
+
+static int __init olpc_dt_pkg2path(phandle node, char *buf,
+		const int buflen, int *len)
+{
+	const void *args[] = { (void *)node, buf, (void *)buflen };
+	void *res[] = { len };
+
+	if ((s32)node == -1)
+		return -1;
+
+	if (olpc_ofw("package-to-path", args, res) || *len < 1)
+		return -1;
+
+	return 0;
+}
+
+static unsigned int prom_early_allocated __initdata;
+
+void * __init prom_early_alloc(unsigned long size)
+{
+	static u8 *mem;
+	static size_t free_mem;
+	void *res;
+
+	if (free_mem < size) {
+		const size_t chunk_size = max(PAGE_SIZE, size);
+
+		/*
+		 * To mimimize the number of allocations, grab at least
+		 * PAGE_SIZE of memory (that's an arbitrary choice that's
+		 * fast enough on the platforms we care about while minimizing
+		 * wasted bootmem) and hand off chunks of it to callers.
+		 */
+		res = alloc_bootmem(chunk_size);
+		BUG_ON(!res);
+		prom_early_allocated += chunk_size;
+		memset(res, 0, chunk_size);
+		free_mem = chunk_size;
+		mem = res;
+	}
+
+	/* allocate from the local cache */
+	free_mem -= size;
+	res = mem;
+	mem += size;
+	return res;
+}
+
+static struct of_pdt_ops prom_olpc_ops __initdata = {
+	.nextprop = olpc_dt_nextprop,
+	.getproplen = olpc_dt_getproplen,
+	.getproperty = olpc_dt_getproperty,
+	.getchild = olpc_dt_getchild,
+	.getsibling = olpc_dt_getsibling,
+	.pkg2path = olpc_dt_pkg2path,
+};
+
+static phandle __init olpc_dt_finddevice(const char *path)
+{
+	phandle node;
+	const void *args[] = { path };
+	void *res[] = { &node };
+
+	if (olpc_ofw("finddevice", args, res)) {
+		pr_err("olpc_dt: finddevice failed!\n");
+		return 0;
+	}
+
+	if ((s32) node == -1)
+		return 0;
+
+	return node;
+}
+
+static int __init olpc_dt_interpret(const char *words)
+{
+	int result;
+	const void *args[] = { words };
+	void *res[] = { &result };
+
+	if (olpc_ofw("interpret", args, res)) {
+		pr_err("olpc_dt: interpret failed!\n");
+		return -1;
+	}
+
+	return result;
+}
+
+/*
+ * Extract board revision directly from OFW device tree.
+ * We can't use olpc_platform_info because that hasn't been set up yet.
+ */
+static u32 __init olpc_dt_get_board_revision(void)
+{
+	phandle node;
+	__be32 rev;
+	int r;
+
+	node = olpc_dt_finddevice("/");
+	if (!node)
+		return 0;
+
+	r = olpc_dt_getproperty(node, "board-revision-int",
+				(char *) &rev, sizeof(rev));
+	if (r < 0)
+		return 0;
+
+	return be32_to_cpu(rev);
+}
+
+void __init olpc_dt_fixup(void)
+{
+	int r;
+	char buf[64];
+	phandle node;
+	u32 board_rev;
+
+	node = olpc_dt_finddevice("/battery@0");
+	if (!node)
+		return;
+
+	/*
+	 * If the battery node has a compatible property, we are running a new
+	 * enough firmware and don't have fixups to make.
+	 */
+	r = olpc_dt_getproperty(node, "compatible", buf, sizeof(buf));
+	if (r > 0)
+		return;
+
+	pr_info("PROM DT: Old firmware detected, applying fixes\n");
+
+	/* Add olpc,xo1-battery compatible marker to battery node */
+	olpc_dt_interpret("\" /battery@0\" find-device"
+		" \" olpc,xo1-battery\" +compatible"
+		" device-end");
+
+	board_rev = olpc_dt_get_board_revision();
+	if (!board_rev)
+		return;
+
+	if (board_rev >= olpc_board_pre(0xd0)) {
+		/* XO-1.5: add dcon device */
+		olpc_dt_interpret("\" /pci/display@1\" find-device"
+			" new-device"
+			" \" dcon\" device-name \" olpc,xo1-dcon\" +compatible"
+			" finish-device device-end");
+	} else {
+		/* XO-1: add dcon device, mark RTC as olpc,xo1-rtc */
+		olpc_dt_interpret("\" /pci/display@1,1\" find-device"
+			" new-device"
+			" \" dcon\" device-name \" olpc,xo1-dcon\" +compatible"
+			" finish-device device-end"
+			" \" /rtc\" find-device"
+			" \" olpc,xo1-rtc\" +compatible"
+			" device-end");
+	}
+}
+
+void __init olpc_dt_build_devicetree(void)
+{
+	phandle root;
+
+	if (!olpc_ofw_is_installed())
+		return;
+
+	olpc_dt_fixup();
+
+	root = olpc_dt_getsibling(0);
+	if (!root) {
+		pr_err("PROM: unable to get root node from OFW!\n");
+		return;
+	}
+	of_pdt_build_devicetree(root, &prom_olpc_ops);
+
+	pr_info("PROM DT: Built device tree with %u bytes of memory.\n",
+			prom_early_allocated);
+}
+
+/* A list of DT node/bus matches that we want to expose as platform devices */
+static struct of_device_id __initdata of_ids[] = {
+	{ .compatible = "olpc,xo1-battery" },
+	{ .compatible = "olpc,xo1-dcon" },
+	{ .compatible = "olpc,xo1-rtc" },
+	{},
+};
+
+static int __init olpc_create_platform_devices(void)
+{
+	if (machine_is_olpc())
+		return of_platform_bus_probe(NULL, of_ids, NULL);
+	else
+		return 0;
+}
+device_initcall(olpc_create_platform_devices);

arch/x86/platform/olpc/olpc_ofw.c

@@ -0,0 +1,117 @@
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/init.h>
+#include <asm/page.h>
+#include <asm/setup.h>
+#include <asm/io.h>
+#include <asm/pgtable.h>
+#include <asm/olpc_ofw.h>
+
+/* address of OFW callback interface; will be NULL if OFW isn't found */
+static int (*olpc_ofw_cif)(int *);
+
+/* page dir entry containing OFW's pgdir table; filled in by head_32.S */
+u32 olpc_ofw_pgd __initdata;
+
+static DEFINE_SPINLOCK(ofw_lock);
+
+#define MAXARGS 10
+
+void __init setup_olpc_ofw_pgd(void)
+{
+	pgd_t *base, *ofw_pde;
+
+	if (!olpc_ofw_cif)
+		return;
+
+	/* fetch OFW's PDE */
+	base = early_ioremap(olpc_ofw_pgd, sizeof(olpc_ofw_pgd) * PTRS_PER_PGD);
+	if (!base) {
+		printk(KERN_ERR "failed to remap OFW's pgd - disabling OFW!\n");
+		olpc_ofw_cif = NULL;
+		return;
+	}
+	ofw_pde = &base[OLPC_OFW_PDE_NR];
+
+	/* install OFW's PDE permanently into the kernel's pgtable */
+	set_pgd(&swapper_pg_dir[OLPC_OFW_PDE_NR], *ofw_pde);
+	/* implicit optimization barrier here due to uninline function return */
+
+	early_iounmap(base, sizeof(olpc_ofw_pgd) * PTRS_PER_PGD);
+}
+
+int __olpc_ofw(const char *name, int nr_args, const void **args, int nr_res,
+		void **res)
+{
+	int ofw_args[MAXARGS + 3];
+	unsigned long flags;
+	int ret, i, *p;
+
+	BUG_ON(nr_args + nr_res > MAXARGS);
+
+	if (!olpc_ofw_cif)
+		return -EIO;
+
+	ofw_args[0] = (int)name;
+	ofw_args[1] = nr_args;
+	ofw_args[2] = nr_res;
+
+	p = &ofw_args[3];
+	for (i = 0; i < nr_args; i++, p++)
+		*p = (int)args[i];
+
+	/* call into ofw */
+	spin_lock_irqsave(&ofw_lock, flags);
+	ret = olpc_ofw_cif(ofw_args);
+	spin_unlock_irqrestore(&ofw_lock, flags);
+
+	if (!ret) {
+		for (i = 0; i < nr_res; i++, p++)
+			*((int *)res[i]) = *p;
+	}
+
+	return ret;
+}
+EXPORT_SYMBOL_GPL(__olpc_ofw);
+
+bool olpc_ofw_present(void)
+{
+	return olpc_ofw_cif != NULL;
+}
+EXPORT_SYMBOL_GPL(olpc_ofw_present);
+
+/* OFW cif _should_ be above this address */
+#define OFW_MIN 0xff000000
+
+/* OFW starts on a 1MB boundary */
+#define OFW_BOUND (1<<20)
+
+void __init olpc_ofw_detect(void)
+{
+	struct olpc_ofw_header *hdr = &boot_params.olpc_ofw_header;
+	unsigned long start;
+
+	/* ensure OFW booted us by checking for "OFW " string */
+	if (hdr->ofw_magic != OLPC_OFW_SIG)
+		return;
+
+	olpc_ofw_cif = (int (*)(int *))hdr->cif_handler;
+
+	if ((unsigned long)olpc_ofw_cif < OFW_MIN) {
+		printk(KERN_ERR "OFW detected, but cif has invalid address 0x%lx - disabling.\n",
+				(unsigned long)olpc_ofw_cif);
+		olpc_ofw_cif = NULL;
+		return;
+	}
+
+	/* determine where OFW starts in memory */
+	start = round_down((unsigned long)olpc_ofw_cif, OFW_BOUND);
+	printk(KERN_INFO "OFW detected in memory, cif @ 0x%lx (reserving top %ldMB)\n",
+			(unsigned long)olpc_ofw_cif, (-start) >> 20);
+	reserve_top_address(-start);
+}
+
+bool __init olpc_ofw_is_installed(void)
+{
+	return olpc_ofw_cif != NULL;
+}

arch/x86/platform/olpc/xo1-wakeup.S

@@ -0,0 +1,124 @@
+.text
+#include <linux/linkage.h>
+#include <asm/segment.h>
+#include <asm/page.h>
+#include <asm/pgtable_32.h>
+
+	.macro writepost,value
+		movb $0x34, %al
+		outb %al, $0x70
+		movb $\value, %al
+		outb %al, $0x71
+	.endm
+
+wakeup_start:
+	# OFW lands us here, running in protected mode, with a
+	# kernel-compatible GDT already setup.
+
+	# Clear any dangerous flags
+	pushl $0
+	popfl
+
+	writepost 0x31
+
+	# Set up %cr3
+	movl $initial_page_table - __PAGE_OFFSET, %eax
+	movl %eax, %cr3
+
+	movl saved_cr4, %eax
+	movl %eax, %cr4
+
+	movl saved_cr0, %eax
+	movl %eax, %cr0
+
+	# Control registers were modified, pipeline resync is needed
+	jmp 1f
+1:
+
+	movw    $__KERNEL_DS, %ax
+	movw    %ax, %ss
+	movw    %ax, %ds
+	movw    %ax, %es
+	movw    %ax, %fs
+	movw    %ax, %gs
+
+	lgdt    saved_gdt
+	lidt    saved_idt
+	lldt    saved_ldt
+	ljmp    $(__KERNEL_CS),$1f
+1:
+	movl    %cr3, %eax
+	movl    %eax, %cr3
+	wbinvd
+
+	# Go back to the return point
+	jmp ret_point
+
+save_registers:
+	sgdt  saved_gdt
+	sidt  saved_idt
+	sldt  saved_ldt
+
+	pushl %edx
+	movl %cr4, %edx
+	movl %edx, saved_cr4
+
+	movl %cr0, %edx
+	movl %edx, saved_cr0
+
+	popl %edx
+
+	movl %ebx, saved_context_ebx
+	movl %ebp, saved_context_ebp
+	movl %esi, saved_context_esi
+	movl %edi, saved_context_edi
+
+	pushfl
+	popl saved_context_eflags
+
+	ret
+
+restore_registers:
+	movl saved_context_ebp, %ebp
+	movl saved_context_ebx, %ebx
+	movl saved_context_esi, %esi
+	movl saved_context_edi, %edi
+
+	pushl saved_context_eflags
+	popfl
+
+	ret
+
+ENTRY(do_olpc_suspend_lowlevel)
+	call	save_processor_state
+	call	save_registers
+
+	# This is the stack context we want to remember
+	movl %esp, saved_context_esp
+
+	pushl	$3
+	call	xo1_do_sleep
+
+	jmp	wakeup_start
+	.p2align 4,,7
+ret_point:
+	movl    saved_context_esp, %esp
+
+	writepost 0x32
+
+	call	restore_registers
+	call	restore_processor_state
+	ret
+
+.data
+saved_gdt:             .long   0,0
+saved_idt:             .long   0,0
+saved_ldt:             .long   0
+saved_cr4:             .long   0
+saved_cr0:             .long   0
+saved_context_esp:     .long   0
+saved_context_edi:     .long   0
+saved_context_esi:     .long   0
+saved_context_ebx:     .long   0
+saved_context_ebp:     .long   0
+saved_context_eflags:  .long   0