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1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 | // 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); |