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Linux/arch/x86/platform/olpc/olpc-xo1-pm.c

  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 #include <linux/olpc-ec.h>
 22 
 23 #include <asm/io.h>
 24 #include <asm/olpc.h>
 25 
 26 #define DRV_NAME "olpc-xo1-pm"
 27 
 28 static unsigned long acpi_base;
 29 static unsigned long pms_base;
 30 
 31 static u16 wakeup_mask = CS5536_PM_PWRBTN;
 32 
 33 static struct {
 34         unsigned long address;
 35         unsigned short segment;
 36 } ofw_bios_entry = { 0xF0000 + PAGE_OFFSET, __KERNEL_CS };
 37 
 38 /* Set bits in the wakeup mask */
 39 void olpc_xo1_pm_wakeup_set(u16 value)
 40 {
 41         wakeup_mask |= value;
 42 }
 43 EXPORT_SYMBOL_GPL(olpc_xo1_pm_wakeup_set);
 44 
 45 /* Clear bits in the wakeup mask */
 46 void olpc_xo1_pm_wakeup_clear(u16 value)
 47 {
 48         wakeup_mask &= ~value;
 49 }
 50 EXPORT_SYMBOL_GPL(olpc_xo1_pm_wakeup_clear);
 51 
 52 static int xo1_power_state_enter(suspend_state_t pm_state)
 53 {
 54         unsigned long saved_sci_mask;
 55 
 56         /* Only STR is supported */
 57         if (pm_state != PM_SUSPEND_MEM)
 58                 return -EINVAL;
 59 
 60         /*
 61          * Save SCI mask (this gets lost since PM1_EN is used as a mask for
 62          * wakeup events, which is not necessarily the same event set)
 63          */
 64         saved_sci_mask = inl(acpi_base + CS5536_PM1_STS);
 65         saved_sci_mask &= 0xffff0000;
 66 
 67         /* Save CPU state */
 68         do_olpc_suspend_lowlevel();
 69 
 70         /* Resume path starts here */
 71 
 72         /* Restore SCI mask (using dword access to CS5536_PM1_EN) */
 73         outl(saved_sci_mask, acpi_base + CS5536_PM1_STS);
 74 
 75         return 0;
 76 }
 77 
 78 asmlinkage __visible int xo1_do_sleep(u8 sleep_state)
 79 {
 80         void *pgd_addr = __va(read_cr3());
 81 
 82         /* Program wakeup mask (using dword access to CS5536_PM1_EN) */
 83         outl(wakeup_mask << 16, acpi_base + CS5536_PM1_STS);
 84 
 85         __asm__("movl %0,%%eax" : : "r" (pgd_addr));
 86         __asm__("call *(%%edi); cld"
 87                 : : "D" (&ofw_bios_entry));
 88         __asm__("movb $0x34, %al\n\t"
 89                 "outb %al, $0x70\n\t"
 90                 "movb $0x30, %al\n\t"
 91                 "outb %al, $0x71\n\t");
 92         return 0;
 93 }
 94 
 95 static void xo1_power_off(void)
 96 {
 97         printk(KERN_INFO "OLPC XO-1 power off sequence...\n");
 98 
 99         /* Enable all of these controls with 0 delay */
100         outl(0x40000000, pms_base + CS5536_PM_SCLK);
101         outl(0x40000000, pms_base + CS5536_PM_IN_SLPCTL);
102         outl(0x40000000, pms_base + CS5536_PM_WKXD);
103         outl(0x40000000, pms_base + CS5536_PM_WKD);
104 
105         /* Clear status bits (possibly unnecessary) */
106         outl(0x0002ffff, pms_base  + CS5536_PM_SSC);
107         outl(0xffffffff, acpi_base + CS5536_PM_GPE0_STS);
108 
109         /* Write SLP_EN bit to start the machinery */
110         outl(0x00002000, acpi_base + CS5536_PM1_CNT);
111 }
112 
113 static int xo1_power_state_valid(suspend_state_t pm_state)
114 {
115         /* suspend-to-RAM only */
116         return pm_state == PM_SUSPEND_MEM;
117 }
118 
119 static const struct platform_suspend_ops xo1_suspend_ops = {
120         .valid = xo1_power_state_valid,
121         .enter = xo1_power_state_enter,
122 };
123 
124 static int xo1_pm_probe(struct platform_device *pdev)
125 {
126         struct resource *res;
127         int err;
128 
129         /* don't run on non-XOs */
130         if (!machine_is_olpc())
131                 return -ENODEV;
132 
133         err = mfd_cell_enable(pdev);
134         if (err)
135                 return err;
136 
137         res = platform_get_resource(pdev, IORESOURCE_IO, 0);
138         if (!res) {
139                 dev_err(&pdev->dev, "can't fetch device resource info\n");
140                 return -EIO;
141         }
142         if (strcmp(pdev->name, "cs5535-pms") == 0)
143                 pms_base = res->start;
144         else if (strcmp(pdev->name, "olpc-xo1-pm-acpi") == 0)
145                 acpi_base = res->start;
146 
147         /* If we have both addresses, we can override the poweroff hook */
148         if (pms_base && acpi_base) {
149                 suspend_set_ops(&xo1_suspend_ops);
150                 pm_power_off = xo1_power_off;
151                 printk(KERN_INFO "OLPC XO-1 support registered\n");
152         }
153 
154         return 0;
155 }
156 
157 static int xo1_pm_remove(struct platform_device *pdev)
158 {
159         mfd_cell_disable(pdev);
160 
161         if (strcmp(pdev->name, "cs5535-pms") == 0)
162                 pms_base = 0;
163         else if (strcmp(pdev->name, "olpc-xo1-pm-acpi") == 0)
164                 acpi_base = 0;
165 
166         pm_power_off = NULL;
167         return 0;
168 }
169 
170 static struct platform_driver cs5535_pms_driver = {
171         .driver = {
172                 .name = "cs5535-pms",
173                 .owner = THIS_MODULE,
174         },
175         .probe = xo1_pm_probe,
176         .remove = xo1_pm_remove,
177 };
178 
179 static struct platform_driver cs5535_acpi_driver = {
180         .driver = {
181                 .name = "olpc-xo1-pm-acpi",
182                 .owner = THIS_MODULE,
183         },
184         .probe = xo1_pm_probe,
185         .remove = xo1_pm_remove,
186 };
187 
188 static int __init xo1_pm_init(void)
189 {
190         int r;
191 
192         r = platform_driver_register(&cs5535_pms_driver);
193         if (r)
194                 return r;
195 
196         r = platform_driver_register(&cs5535_acpi_driver);
197         if (r)
198                 platform_driver_unregister(&cs5535_pms_driver);
199 
200         return r;
201 }
202 arch_initcall(xo1_pm_init);
203 

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