1 /* 2 * Support for power management features of the OLPC XO-1 laptop 3 * 4 * Copyright (C) 2010 Andres Salomon <dilinger@queued.net> 5 * Copyright (C) 2010 One Laptop per Child 6 * Copyright (C) 2006 Red Hat, Inc. 7 * Copyright (C) 2006 Advanced Micro Devices, Inc. 8 * 9 * This program is free software; you can redistribute it and/or modify 10 * it under the terms of the GNU General Public License as published by 11 * the Free Software Foundation; either version 2 of the License, or 12 * (at your option) any later version. 13 */ 14 15 #include <linux/cs5535.h> 16 #include <linux/platform_device.h> 17 #include <linux/export.h> 18 #include <linux/pm.h> 19 #include <linux/mfd/core.h> 20 #include <linux/suspend.h> 21 22 #include <asm/io.h> 23 #include <asm/olpc.h> 24 25 #define DRV_NAME "olpc-xo1-pm" 26 27 static unsigned long acpi_base; 28 static unsigned long pms_base; 29 30 static u16 wakeup_mask = CS5536_PM_PWRBTN; 31 32 static struct { 33 unsigned long address; 34 unsigned short segment; 35 } ofw_bios_entry = { 0xF0000 + PAGE_OFFSET, __KERNEL_CS }; 36 37 /* Set bits in the wakeup mask */ 38 void olpc_xo1_pm_wakeup_set(u16 value) 39 { 40 wakeup_mask |= value; 41 } 42 EXPORT_SYMBOL_GPL(olpc_xo1_pm_wakeup_set); 43 44 /* Clear bits in the wakeup mask */ 45 void olpc_xo1_pm_wakeup_clear(u16 value) 46 { 47 wakeup_mask &= ~value; 48 } 49 EXPORT_SYMBOL_GPL(olpc_xo1_pm_wakeup_clear); 50 51 static int xo1_power_state_enter(suspend_state_t pm_state) 52 { 53 unsigned long saved_sci_mask; 54 int r; 55 56 /* Only STR is supported */ 57 if (pm_state != PM_SUSPEND_MEM) 58 return -EINVAL; 59 60 r = olpc_ec_cmd(EC_SET_SCI_INHIBIT, NULL, 0, NULL, 0); 61 if (r) 62 return r; 63 64 /* 65 * Save SCI mask (this gets lost since PM1_EN is used as a mask for 66 * wakeup events, which is not necessarily the same event set) 67 */ 68 saved_sci_mask = inl(acpi_base + CS5536_PM1_STS); 69 saved_sci_mask &= 0xffff0000; 70 71 /* Save CPU state */ 72 do_olpc_suspend_lowlevel(); 73 74 /* Resume path starts here */ 75 76 /* Restore SCI mask (using dword access to CS5536_PM1_EN) */ 77 outl(saved_sci_mask, acpi_base + CS5536_PM1_STS); 78 79 /* Tell the EC to stop inhibiting SCIs */ 80 olpc_ec_cmd(EC_SET_SCI_INHIBIT_RELEASE, NULL, 0, NULL, 0); 81 82 /* 83 * Tell the wireless module to restart USB communication. 84 * Must be done twice. 85 */ 86 olpc_ec_cmd(EC_WAKE_UP_WLAN, NULL, 0, NULL, 0); 87 olpc_ec_cmd(EC_WAKE_UP_WLAN, NULL, 0, NULL, 0); 88 89 return 0; 90 } 91 92 asmlinkage int xo1_do_sleep(u8 sleep_state) 93 { 94 void *pgd_addr = __va(read_cr3()); 95 96 /* Program wakeup mask (using dword access to CS5536_PM1_EN) */ 97 outl(wakeup_mask << 16, acpi_base + CS5536_PM1_STS); 98 99 __asm__("movl %0,%%eax" : : "r" (pgd_addr)); 100 __asm__("call *(%%edi); cld" 101 : : "D" (&ofw_bios_entry)); 102 __asm__("movb $0x34, %al\n\t" 103 "outb %al, $0x70\n\t" 104 "movb $0x30, %al\n\t" 105 "outb %al, $0x71\n\t"); 106 return 0; 107 } 108 109 static void xo1_power_off(void) 110 { 111 printk(KERN_INFO "OLPC XO-1 power off sequence...\n"); 112 113 /* Enable all of these controls with 0 delay */ 114 outl(0x40000000, pms_base + CS5536_PM_SCLK); 115 outl(0x40000000, pms_base + CS5536_PM_IN_SLPCTL); 116 outl(0x40000000, pms_base + CS5536_PM_WKXD); 117 outl(0x40000000, pms_base + CS5536_PM_WKD); 118 119 /* Clear status bits (possibly unnecessary) */ 120 outl(0x0002ffff, pms_base + CS5536_PM_SSC); 121 outl(0xffffffff, acpi_base + CS5536_PM_GPE0_STS); 122 123 /* Write SLP_EN bit to start the machinery */ 124 outl(0x00002000, acpi_base + CS5536_PM1_CNT); 125 } 126 127 static int xo1_power_state_valid(suspend_state_t pm_state) 128 { 129 /* suspend-to-RAM only */ 130 return pm_state == PM_SUSPEND_MEM; 131 } 132 133 static const struct platform_suspend_ops xo1_suspend_ops = { 134 .valid = xo1_power_state_valid, 135 .enter = xo1_power_state_enter, 136 }; 137 138 static int __devinit xo1_pm_probe(struct platform_device *pdev) 139 { 140 struct resource *res; 141 int err; 142 143 /* don't run on non-XOs */ 144 if (!machine_is_olpc()) 145 return -ENODEV; 146 147 err = mfd_cell_enable(pdev); 148 if (err) 149 return err; 150 151 res = platform_get_resource(pdev, IORESOURCE_IO, 0); 152 if (!res) { 153 dev_err(&pdev->dev, "can't fetch device resource info\n"); 154 return -EIO; 155 } 156 if (strcmp(pdev->name, "cs5535-pms") == 0) 157 pms_base = res->start; 158 else if (strcmp(pdev->name, "olpc-xo1-pm-acpi") == 0) 159 acpi_base = res->start; 160 161 /* If we have both addresses, we can override the poweroff hook */ 162 if (pms_base && acpi_base) { 163 suspend_set_ops(&xo1_suspend_ops); 164 pm_power_off = xo1_power_off; 165 printk(KERN_INFO "OLPC XO-1 support registered\n"); 166 } 167 168 return 0; 169 } 170 171 static int __devexit xo1_pm_remove(struct platform_device *pdev) 172 { 173 mfd_cell_disable(pdev); 174 175 if (strcmp(pdev->name, "cs5535-pms") == 0) 176 pms_base = 0; 177 else if (strcmp(pdev->name, "olpc-xo1-pm-acpi") == 0) 178 acpi_base = 0; 179 180 pm_power_off = NULL; 181 return 0; 182 } 183 184 static struct platform_driver cs5535_pms_driver = { 185 .driver = { 186 .name = "cs5535-pms", 187 .owner = THIS_MODULE, 188 }, 189 .probe = xo1_pm_probe, 190 .remove = __devexit_p(xo1_pm_remove), 191 }; 192 193 static struct platform_driver cs5535_acpi_driver = { 194 .driver = { 195 .name = "olpc-xo1-pm-acpi", 196 .owner = THIS_MODULE, 197 }, 198 .probe = xo1_pm_probe, 199 .remove = __devexit_p(xo1_pm_remove), 200 }; 201 202 static int __init xo1_pm_init(void) 203 { 204 int r; 205 206 r = platform_driver_register(&cs5535_pms_driver); 207 if (r) 208 return r; 209 210 r = platform_driver_register(&cs5535_acpi_driver); 211 if (r) 212 platform_driver_unregister(&cs5535_pms_driver); 213 214 return r; 215 } 216 arch_initcall(xo1_pm_init); 217