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188 lines
4.3 KiB
188 lines
4.3 KiB
// SPDX-License-Identifier: GPL-2.0-or-later |
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/* |
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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 <[email protected]> |
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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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#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/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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/* don't run on non-XOs */ |
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if (!machine_is_olpc()) |
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return -ENODEV; |
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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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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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