/*
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* Support for power management features of the OLPC XO-1 laptop
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*
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* Copyright (C) 2010 Andres Salomon <dilinger@queued.net>
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* Copyright (C) 2010 One Laptop per Child
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* Copyright (C) 2006 Red Hat, Inc.
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* Copyright (C) 2006 Advanced Micro Devices, Inc.
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*/
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#include <linux/cs5535.h>
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#include <linux/platform_device.h>
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#include <linux/export.h>
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#include <linux/pm.h>
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#include <linux/mfd/core.h>
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#include <linux/suspend.h>
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#include <linux/olpc-ec.h>
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#include <asm/io.h>
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#include <asm/olpc.h>
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#define DRV_NAME "olpc-xo1-pm"
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static unsigned long acpi_base;
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static unsigned long pms_base;
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static u16 wakeup_mask = CS5536_PM_PWRBTN;
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static struct {
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unsigned long address;
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unsigned short segment;
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} ofw_bios_entry = { 0xF0000 + PAGE_OFFSET, __KERNEL_CS };
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/* Set bits in the wakeup mask */
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void olpc_xo1_pm_wakeup_set(u16 value)
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{
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wakeup_mask |= value;
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}
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EXPORT_SYMBOL_GPL(olpc_xo1_pm_wakeup_set);
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/* Clear bits in the wakeup mask */
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void olpc_xo1_pm_wakeup_clear(u16 value)
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{
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wakeup_mask &= ~value;
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}
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EXPORT_SYMBOL_GPL(olpc_xo1_pm_wakeup_clear);
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static int xo1_power_state_enter(suspend_state_t pm_state)
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{
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unsigned long saved_sci_mask;
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/* Only STR is supported */
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if (pm_state != PM_SUSPEND_MEM)
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return -EINVAL;
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/*
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* Save SCI mask (this gets lost since PM1_EN is used as a mask for
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* wakeup events, which is not necessarily the same event set)
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*/
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saved_sci_mask = inl(acpi_base + CS5536_PM1_STS);
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saved_sci_mask &= 0xffff0000;
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/* Save CPU state */
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do_olpc_suspend_lowlevel();
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/* Resume path starts here */
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/* Restore SCI mask (using dword access to CS5536_PM1_EN) */
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outl(saved_sci_mask, acpi_base + CS5536_PM1_STS);
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return 0;
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}
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asmlinkage __visible int xo1_do_sleep(u8 sleep_state)
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{
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void *pgd_addr = __va(read_cr3_pa());
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/* Program wakeup mask (using dword access to CS5536_PM1_EN) */
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outl(wakeup_mask << 16, acpi_base + CS5536_PM1_STS);
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__asm__("movl %0,%%eax" : : "r" (pgd_addr));
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__asm__("call *(%%edi); cld"
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: : "D" (&ofw_bios_entry));
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__asm__("movb $0x34, %al\n\t"
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"outb %al, $0x70\n\t"
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"movb $0x30, %al\n\t"
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"outb %al, $0x71\n\t");
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return 0;
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}
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static void xo1_power_off(void)
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{
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printk(KERN_INFO "OLPC XO-1 power off sequence...\n");
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/* Enable all of these controls with 0 delay */
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outl(0x40000000, pms_base + CS5536_PM_SCLK);
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outl(0x40000000, pms_base + CS5536_PM_IN_SLPCTL);
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outl(0x40000000, pms_base + CS5536_PM_WKXD);
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outl(0x40000000, pms_base + CS5536_PM_WKD);
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/* Clear status bits (possibly unnecessary) */
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outl(0x0002ffff, pms_base + CS5536_PM_SSC);
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outl(0xffffffff, acpi_base + CS5536_PM_GPE0_STS);
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/* Write SLP_EN bit to start the machinery */
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outl(0x00002000, acpi_base + CS5536_PM1_CNT);
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}
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static int xo1_power_state_valid(suspend_state_t pm_state)
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{
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/* suspend-to-RAM only */
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return pm_state == PM_SUSPEND_MEM;
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}
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static const struct platform_suspend_ops xo1_suspend_ops = {
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.valid = xo1_power_state_valid,
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.enter = xo1_power_state_enter,
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};
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static int xo1_pm_probe(struct platform_device *pdev)
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{
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struct resource *res;
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int err;
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/* don't run on non-XOs */
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if (!machine_is_olpc())
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return -ENODEV;
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err = mfd_cell_enable(pdev);
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if (err)
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return err;
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res = platform_get_resource(pdev, IORESOURCE_IO, 0);
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if (!res) {
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dev_err(&pdev->dev, "can't fetch device resource info\n");
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return -EIO;
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}
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if (strcmp(pdev->name, "cs5535-pms") == 0)
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pms_base = res->start;
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else if (strcmp(pdev->name, "olpc-xo1-pm-acpi") == 0)
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acpi_base = res->start;
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/* If we have both addresses, we can override the poweroff hook */
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if (pms_base && acpi_base) {
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suspend_set_ops(&xo1_suspend_ops);
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pm_power_off = xo1_power_off;
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printk(KERN_INFO "OLPC XO-1 support registered\n");
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}
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return 0;
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}
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static int xo1_pm_remove(struct platform_device *pdev)
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{
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mfd_cell_disable(pdev);
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if (strcmp(pdev->name, "cs5535-pms") == 0)
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pms_base = 0;
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else if (strcmp(pdev->name, "olpc-xo1-pm-acpi") == 0)
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acpi_base = 0;
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pm_power_off = NULL;
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return 0;
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}
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static struct platform_driver cs5535_pms_driver = {
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.driver = {
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.name = "cs5535-pms",
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},
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.probe = xo1_pm_probe,
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.remove = xo1_pm_remove,
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};
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static struct platform_driver cs5535_acpi_driver = {
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.driver = {
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.name = "olpc-xo1-pm-acpi",
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},
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.probe = xo1_pm_probe,
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.remove = xo1_pm_remove,
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};
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static int __init xo1_pm_init(void)
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{
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int r;
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r = platform_driver_register(&cs5535_pms_driver);
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if (r)
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return r;
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r = platform_driver_register(&cs5535_acpi_driver);
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if (r)
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platform_driver_unregister(&cs5535_pms_driver);
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return r;
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}
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arch_initcall(xo1_pm_init);
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