git://bbs.cooldavid.org / net-next-2.6.git / blame
| Commit | Line | Data |
|---|---|---|
| bf1ebf00 DD |
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); |