summaryrefslogtreecommitdiffstats
path: root/arch/x86/platform/olpc
diff options
context:
space:
mode:
Diffstat (limited to 'arch/x86/platform/olpc')
-rw-r--r--arch/x86/platform/olpc/Makefile6
-rw-r--r--arch/x86/platform/olpc/olpc-xo1-pm.c188
-rw-r--r--arch/x86/platform/olpc/olpc-xo1-rtc.c80
-rw-r--r--arch/x86/platform/olpc/olpc-xo1-sci.c629
-rw-r--r--arch/x86/platform/olpc/olpc-xo15-sci.c231
-rw-r--r--arch/x86/platform/olpc/olpc.c321
-rw-r--r--arch/x86/platform/olpc/olpc_dt.c326
-rw-r--r--arch/x86/platform/olpc/olpc_ofw.c121
-rw-r--r--arch/x86/platform/olpc/xo1-wakeup.S126
9 files changed, 2028 insertions, 0 deletions
diff --git a/arch/x86/platform/olpc/Makefile b/arch/x86/platform/olpc/Makefile
new file mode 100644
index 000000000..049f92a93
--- /dev/null
+++ b/arch/x86/platform/olpc/Makefile
@@ -0,0 +1,6 @@
+# SPDX-License-Identifier: GPL-2.0
+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
diff --git a/arch/x86/platform/olpc/olpc-xo1-pm.c b/arch/x86/platform/olpc/olpc-xo1-pm.c
new file mode 100644
index 000000000..f067ac780
--- /dev/null
+++ b/arch/x86/platform/olpc/olpc-xo1-pm.c
@@ -0,0 +1,188 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
+/*
+ * 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.
+ */
+
+#include <linux/cs5535.h>
+#include <linux/platform_device.h>
+#include <linux/export.h>
+#include <linux/pm.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_pa());
+
+ /* 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;
+
+ /* don't run on non-XOs */
+ if (!machine_is_olpc())
+ return -ENODEV;
+
+ 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)
+{
+ 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",
+ },
+ .probe = xo1_pm_probe,
+ .remove = xo1_pm_remove,
+};
+
+static struct platform_driver cs5535_acpi_driver = {
+ .driver = {
+ .name = "olpc-xo1-pm-acpi",
+ },
+ .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);
diff --git a/arch/x86/platform/olpc/olpc-xo1-rtc.c b/arch/x86/platform/olpc/olpc-xo1-rtc.c
new file mode 100644
index 000000000..57f210cda
--- /dev/null
+++ b/arch/x86/platform/olpc/olpc-xo1-rtc.c
@@ -0,0 +1,80 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
+/*
+ * Support for OLPC XO-1 Real Time Clock (RTC)
+ *
+ * Copyright (C) 2011 One Laptop per Child
+ */
+
+#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>
+#include <asm/x86_init.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;
+
+ x86_platform.legacy.rtc = 0;
+
+ device_init_wakeup(&xo1_rtc_device.dev, 1);
+ return 0;
+}
+arch_initcall(xo1_rtc_init);
diff --git a/arch/x86/platform/olpc/olpc-xo1-sci.c b/arch/x86/platform/olpc/olpc-xo1-sci.c
new file mode 100644
index 000000000..89f25af4b
--- /dev/null
+++ b/arch/x86/platform/olpc/olpc-xo1-sci.c
@@ -0,0 +1,629 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
+/*
+ * 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.
+ */
+
+#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/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);
+ power_supply_put(psy);
+ }
+}
+
+static void ac_status_changed(void)
+{
+ struct power_supply *psy = power_supply_get_by_name("olpc_ac");
+
+ if (psy) {
+ power_supply_changed(psy);
+ power_supply_put(psy);
+ }
+}
+
+/* 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 anomaly: 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);
+
+static struct attribute *lid_attrs[] = {
+ &dev_attr_lid_wake_mode.attr,
+ NULL,
+};
+ATTRIBUTE_GROUPS(lid);
+
+/*
+ * 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;
+ }
+
+ return 0;
+
+err_register:
+ input_free_device(lid_switch_idev);
+ return r;
+}
+
+static void free_lid_switch(void)
+{
+ 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;
+
+ 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)
+{
+ 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",
+ .dev_groups = lid_groups,
+ },
+ .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);
diff --git a/arch/x86/platform/olpc/olpc-xo15-sci.c b/arch/x86/platform/olpc/olpc-xo15-sci.c
new file mode 100644
index 000000000..994a229cb
--- /dev/null
+++ b/arch/x86/platform/olpc/olpc-xo15-sci.c
@@ -0,0 +1,231 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
+/*
+ * Support for OLPC XO-1.5 System Control Interrupts (SCI)
+ *
+ * Copyright (C) 2009-2010 One Laptop per Child
+ */
+
+#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 opportunistically
+ * 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_warn(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);
+ power_supply_put(psy);
+ }
+}
+
+static void ac_status_changed(void)
+{
+ struct power_supply *psy = power_supply_get_by_name("olpc_ac");
+
+ if (psy) {
+ power_supply_changed(psy);
+ power_supply_put(psy);
+ }
+}
+
+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;
+}
+
+#ifdef CONFIG_PM_SLEEP
+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;
+}
+#endif
+
+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);
diff --git a/arch/x86/platform/olpc/olpc.c b/arch/x86/platform/olpc/olpc.c
new file mode 100644
index 000000000..1d4a00e76
--- /dev/null
+++ b/arch/x86/platform/olpc/olpc.c
@@ -0,0 +1,321 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
+/*
+ * Support for the OLPC DCON and OLPC EC access
+ *
+ * Copyright © 2006 Advanced Micro Devices, Inc.
+ * Copyright © 2007-2008 Andres Salomon <dilinger@debian.org>
+ */
+
+#include <linux/kernel.h>
+#include <linux/init.h>
+#include <linux/export.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);
+
+/* 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;
+}
+
+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;
+
+ pr_info("OLPC board revision %s%X\n",
+ ((olpc_platform_info.boardrev & 0xf) < 8) ? "pre" : "",
+ olpc_platform_info.boardrev >> 4);
+ }
+
+ 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);
+
+ return PTR_ERR_OR_ZERO(pdev);
+}
+
+static int olpc_xo1_ec_suspend(struct platform_device *pdev)
+{
+ /*
+ * 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 = {
+ .suspend = olpc_xo1_ec_suspend,
+ .resume = olpc_xo1_ec_resume,
+ .ec_cmd = olpc_xo1_ec_cmd,
+#ifdef CONFIG_OLPC_XO1_SCI
+ /*
+ * XO-1 EC wakeups are available when olpc-xo1-sci driver is
+ * compiled in
+ */
+ .wakeup_available = true,
+#endif
+};
+
+static struct olpc_ec_driver ec_xo1_5_driver = {
+ .ec_cmd = olpc_xo1_ec_cmd,
+#ifdef CONFIG_OLPC_XO15_SCI
+ /*
+ * XO-1.5 EC wakeups are available when olpc-xo15-sci driver is
+ * compiled in
+ */
+ .wakeup_available = true,
+#endif
+};
+
+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);
diff --git a/arch/x86/platform/olpc/olpc_dt.c b/arch/x86/platform/olpc/olpc_dt.c
new file mode 100644
index 000000000..75e3319e8
--- /dev/null
+++ b/arch/x86/platform/olpc/olpc_dt.c
@@ -0,0 +1,326 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
+/*
+ * 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>
+ */
+
+#include <linux/kernel.h>
+#include <linux/memblock.h>
+#include <linux/of.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 minimize 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 = memblock_alloc(chunk_size, SMP_CACHE_BYTES);
+ if (!res)
+ panic("%s: Failed to allocate %zu bytes\n", __func__,
+ 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);
+}
+
+static int __init olpc_dt_compatible_match(phandle node, const char *compat)
+{
+ char buf[64], *p;
+ int plen, len;
+
+ plen = olpc_dt_getproperty(node, "compatible", buf, sizeof(buf));
+ if (plen <= 0)
+ return 0;
+
+ len = strlen(compat);
+ for (p = buf; p < buf + plen; p += strlen(p) + 1) {
+ if (strcmp(p, compat) == 0)
+ return 1;
+ }
+
+ return 0;
+}
+
+void __init olpc_dt_fixup(void)
+{
+ phandle node;
+ u32 board_rev;
+
+ node = olpc_dt_finddevice("/battery@0");
+ if (!node)
+ return;
+
+ board_rev = olpc_dt_get_board_revision();
+ if (!board_rev)
+ return;
+
+ if (board_rev >= olpc_board_pre(0xd0)) {
+ /* XO-1.5 */
+
+ if (olpc_dt_compatible_match(node, "olpc,xo1.5-battery"))
+ return;
+
+ /* Add olpc,xo1.5-battery compatible marker to battery node */
+ olpc_dt_interpret("\" /battery@0\" find-device");
+ olpc_dt_interpret(" \" olpc,xo1.5-battery\" +compatible");
+ olpc_dt_interpret("device-end");
+
+ if (olpc_dt_compatible_match(node, "olpc,xo1-battery")) {
+ /*
+ * If we have a olpc,xo1-battery compatible, then we're
+ * running a new enough firmware that already has
+ * the dcon node.
+ */
+ return;
+ }
+
+ /* Add dcon device */
+ olpc_dt_interpret("\" /pci/display@1\" find-device");
+ olpc_dt_interpret(" new-device");
+ olpc_dt_interpret(" \" dcon\" device-name");
+ olpc_dt_interpret(" \" olpc,xo1-dcon\" +compatible");
+ olpc_dt_interpret(" finish-device");
+ olpc_dt_interpret("device-end");
+ } else {
+ /* XO-1 */
+
+ if (olpc_dt_compatible_match(node, "olpc,xo1-battery")) {
+ /*
+ * If we have a olpc,xo1-battery compatible, then we're
+ * running a new enough firmware that already has
+ * the dcon and RTC nodes.
+ */
+ return;
+ }
+
+ /* Add dcon device, mark RTC as olpc,xo1-rtc */
+ olpc_dt_interpret("\" /pci/display@1,1\" find-device");
+ olpc_dt_interpret(" new-device");
+ olpc_dt_interpret(" \" dcon\" device-name");
+ olpc_dt_interpret(" \" olpc,xo1-dcon\" +compatible");
+ olpc_dt_interpret(" finish-device");
+ olpc_dt_interpret("device-end");
+
+ olpc_dt_interpret("\" /rtc\" find-device");
+ olpc_dt_interpret(" \" olpc,xo1-rtc\" +compatible");
+ olpc_dt_interpret("device-end");
+ }
+
+ /* Add olpc,xo1-battery compatible marker to battery node */
+ olpc_dt_interpret("\" /battery@0\" find-device");
+ olpc_dt_interpret(" \" olpc,xo1-battery\" +compatible");
+ olpc_dt_interpret("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);
+}
diff --git a/arch/x86/platform/olpc/olpc_ofw.c b/arch/x86/platform/olpc/olpc_ofw.c
new file mode 100644
index 000000000..6bab0f0aa
--- /dev/null
+++ b/arch/x86/platform/olpc/olpc_ofw.c
@@ -0,0 +1,121 @@
+// SPDX-License-Identifier: GPL-2.0-only
+#include <linux/kernel.h>
+#include <linux/export.h>
+#include <linux/spinlock_types.h>
+#include <linux/init.h>
+#include <linux/pgtable.h>
+#include <asm/page.h>
+#include <asm/setup.h>
+#include <asm/io.h>
+#include <asm/cpufeature.h>
+#include <asm/special_insns.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;
+}
diff --git a/arch/x86/platform/olpc/xo1-wakeup.S b/arch/x86/platform/olpc/xo1-wakeup.S
new file mode 100644
index 000000000..3a5abffe5
--- /dev/null
+++ b/arch/x86/platform/olpc/xo1-wakeup.S
@@ -0,0 +1,126 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+.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
+
+SYM_CODE_START(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
+SYM_CODE_END(do_olpc_suspend_lowlevel)
+
+.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