arch/x86/kernel/olpc-xo1.c

   1 /*
   2  * Support for features of the OLPC XO-1 laptop
   3  *
   4  * Copyright (C) 2010 One Laptop per Child
   5  * Copyright (C) 2006 Red Hat, Inc.
   6  * Copyright (C) 2006 Advanced Micro Devices, Inc.
   7  *
   8  * This program is free software; you can redistribute it and/or modify
   9  * it under the terms of the GNU General Public License as published by
  10  * the Free Software Foundation; either version 2 of the License, or
  11  * (at your option) any later version.
  12  */
  13
  14 #include <linux/module.h>
  15 #include <linux/pci.h>
  16 #include <linux/pci_ids.h>
  17 #include <linux/platform_device.h>
  18 #include <linux/pm.h>
  19
  20 #include <asm/io.h>
  21 #include <asm/olpc.h>
  22
  23 #define DRV_NAME "olpc-xo1"
  24
  25 #define PMS_BAR         4
  26 #define ACPI_BAR        5
  27
  28 /* PMC registers (PMS block) */
  29 #define PM_SCLK         0x10
  30 #define PM_IN_SLPCTL    0x20
  31 #define PM_WKXD         0x34
  32 #define PM_WKD          0x30
  33 #define PM_SSC          0x54
  34
  35 /* PM registers (ACPI block) */
  36 #define PM1_CNT         0x08
  37 #define PM_GPE0_STS     0x18
  38
  39 static unsigned long acpi_base;
  40 static unsigned long pms_base;
  41
  42 static void xo1_power_off(void)
  43 {
  44         printk(KERN_INFO "OLPC XO-1 power off sequence...\n");
  45
  46         /* Enable all of these controls with 0 delay */
  47         outl(0x40000000, pms_base + PM_SCLK);
  48         outl(0x40000000, pms_base + PM_IN_SLPCTL);
  49         outl(0x40000000, pms_base + PM_WKXD);
  50         outl(0x40000000, pms_base + PM_WKD);
  51
  52         /* Clear status bits (possibly unnecessary) */
  53         outl(0x0002ffff, pms_base  + PM_SSC);
  54         outl(0xffffffff, acpi_base + PM_GPE0_STS);
  55
  56         /* Write SLP_EN bit to start the machinery */
  57         outl(0x00002000, acpi_base + PM1_CNT);
  58 }
  59
  60 /* Read the base addresses from the PCI BAR info */
  61 static int __devinit setup_bases(struct pci_dev *pdev)
  62 {
  63         int r;
  64
  65         r = pci_enable_device_io(pdev);
  66         if (r) {
  67                 dev_err(&pdev->dev, "can't enable device IO\n");
  68                 return r;
  69         }
  70
  71         r = pci_request_region(pdev, ACPI_BAR, DRV_NAME);
  72         if (r) {
  73                 dev_err(&pdev->dev, "can't alloc PCI BAR #%d\n", ACPI_BAR);
  74                 return r;
  75         }
  76
  77         r = pci_request_region(pdev, PMS_BAR, DRV_NAME);
  78         if (r) {
  79                 dev_err(&pdev->dev, "can't alloc PCI BAR #%d\n", PMS_BAR);
  80                 pci_release_region(pdev, ACPI_BAR);
  81                 return r;
  82         }
  83
  84         acpi_base = pci_resource_start(pdev, ACPI_BAR);
  85         pms_base = pci_resource_start(pdev, PMS_BAR);
  86
  87         return 0;
  88 }
  89
  90 static int __devinit olpc_xo1_probe(struct platform_device *pdev)
  91 {
  92         struct pci_dev *pcidev;
  93         int r;
  94
  95         pcidev = pci_get_device(PCI_VENDOR_ID_AMD, PCI_DEVICE_ID_AMD_CS5536_ISA,
  96                                 NULL);
  97         if (!pdev)
  98                 return -ENODEV;
  99
 100         r = setup_bases(pcidev);
 101         if (r)
 102                 return r;
 103
 104         pm_power_off = xo1_power_off;
 105
 106         printk(KERN_INFO "OLPC XO-1 support registered\n");
 107         return 0;
 108 }
 109
 110 static int __devexit olpc_xo1_remove(struct platform_device *pdev)
 111 {
 112         pm_power_off = NULL;
 113         return 0;
 114 }
 115
 116 static struct platform_driver olpc_xo1_driver = {
 117         .driver = {
 118                 .name = DRV_NAME,
 119                 .owner = THIS_MODULE,
 120         },
 121         .probe = olpc_xo1_probe,
 122         .remove = __devexit_p(olpc_xo1_remove),
 123 };
 124
 125 static int __init olpc_xo1_init(void)
 126 {
 127         return platform_driver_register(&olpc_xo1_driver);
 128 }
 129
 130 static void __exit olpc_xo1_exit(void)
 131 {
 132         platform_driver_unregister(&olpc_xo1_driver);
 133 }
 134
 135 MODULE_AUTHOR("Daniel Drake <dsd@laptop.org>");
 136 MODULE_LICENSE("GPL");
 137 MODULE_ALIAS("platform:olpc-xo1");
 138
 139 module_init(olpc_xo1_init);
 140 module_exit(olpc_xo1_exit);