2 * Support for features of the OLPC XO-1 laptop
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.
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.
15 #include <linux/module.h>
16 #include <linux/platform_device.h>
22 #define DRV_NAME "olpc-xo1"
24 /* PMC registers (PMS block) */
26 #define PM_IN_SLPCTL 0x20
31 /* PM registers (ACPI block) */
33 #define PM_GPE0_STS 0x18
35 static unsigned long acpi_base;
36 static unsigned long pms_base;
38 static void xo1_power_off(void)
40 printk(KERN_INFO "OLPC XO-1 power off sequence...\n");
42 /* Enable all of these controls with 0 delay */
43 outl(0x40000000, pms_base + PM_SCLK);
44 outl(0x40000000, pms_base + PM_IN_SLPCTL);
45 outl(0x40000000, pms_base + PM_WKXD);
46 outl(0x40000000, pms_base + PM_WKD);
48 /* Clear status bits (possibly unnecessary) */
49 outl(0x0002ffff, pms_base + PM_SSC);
50 outl(0xffffffff, acpi_base + PM_GPE0_STS);
52 /* Write SLP_EN bit to start the machinery */
53 outl(0x00002000, acpi_base + PM1_CNT);
56 static int __devinit olpc_xo1_probe(struct platform_device *pdev)
60 /* don't run on non-XOs */
61 if (!machine_is_olpc())
64 res = platform_get_resource(pdev, IORESOURCE_IO, 0);
66 dev_err(&pdev->dev, "can't fetch device resource info\n");
70 if (!request_region(res->start, resource_size(res), DRV_NAME)) {
71 dev_err(&pdev->dev, "can't request region\n");
75 if (strcmp(pdev->name, "cs5535-pms") == 0)
76 pms_base = res->start;
77 else if (strcmp(pdev->name, "cs5535-acpi") == 0)
78 acpi_base = res->start;
80 /* If we have both addresses, we can override the poweroff hook */
81 if (pms_base && acpi_base) {
82 pm_power_off = xo1_power_off;
83 printk(KERN_INFO "OLPC XO-1 support registered\n");
89 static int __devexit olpc_xo1_remove(struct platform_device *pdev)
93 r = platform_get_resource(pdev, IORESOURCE_IO, 0);
94 release_region(r->start, resource_size(r));
96 if (strcmp(pdev->name, "cs5535-pms") == 0)
98 else if (strcmp(pdev->name, "cs5535-acpi") == 0)
105 static struct platform_driver cs5535_pms_drv = {
107 .name = "cs5535-pms",
108 .owner = THIS_MODULE,
110 .probe = olpc_xo1_probe,
111 .remove = __devexit_p(olpc_xo1_remove),
114 static struct platform_driver cs5535_acpi_drv = {
116 .name = "cs5535-acpi",
117 .owner = THIS_MODULE,
119 .probe = olpc_xo1_probe,
120 .remove = __devexit_p(olpc_xo1_remove),
123 static int __init olpc_xo1_init(void)
127 r = platform_driver_register(&cs5535_pms_drv);
131 r = platform_driver_register(&cs5535_acpi_drv);
133 platform_driver_unregister(&cs5535_pms_drv);
138 static void __exit olpc_xo1_exit(void)
140 platform_driver_unregister(&cs5535_acpi_drv);
141 platform_driver_unregister(&cs5535_pms_drv);
144 MODULE_AUTHOR("Daniel Drake <dsd@laptop.org>");
145 MODULE_LICENSE("GPL");
146 MODULE_ALIAS("platform:olpc-xo1");
148 module_init(olpc_xo1_init);
149 module_exit(olpc_xo1_exit);