--- /dev/null
+/*
+ * 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",
+ },
+ .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);
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