| David S. Miller | de2cf33 | 2008-08-28 23:02:36 -0700 | [diff] [blame^] | 1 | /* rtc-starfire.c: Starfire platform RTC driver. |
| 2 | * |
| 3 | * Copyright (C) 2008 David S. Miller <davem@davemloft.net> |
| 4 | */ |
| 5 | |
| 6 | #include <linux/kernel.h> |
| 7 | #include <linux/module.h> |
| 8 | #include <linux/init.h> |
| 9 | #include <linux/time.h> |
| 10 | #include <linux/rtc.h> |
| 11 | #include <linux/platform_device.h> |
| 12 | |
| 13 | #include <asm/oplib.h> |
| 14 | |
| 15 | MODULE_AUTHOR("David S. Miller <davem@davemloft.net>"); |
| 16 | MODULE_DESCRIPTION("Starfire RTC driver"); |
| 17 | MODULE_LICENSE("GPL"); |
| 18 | |
| 19 | struct starfire_rtc { |
| 20 | struct rtc_device *rtc; |
| 21 | spinlock_t lock; |
| 22 | }; |
| 23 | |
| 24 | static u32 starfire_get_time(void) |
| 25 | { |
| 26 | static char obp_gettod[32]; |
| 27 | static u32 unix_tod; |
| 28 | |
| 29 | sprintf(obp_gettod, "h# %08x unix-gettod", |
| 30 | (unsigned int) (long) &unix_tod); |
| 31 | prom_feval(obp_gettod); |
| 32 | |
| 33 | return unix_tod; |
| 34 | } |
| 35 | |
| 36 | static int starfire_read_time(struct device *dev, struct rtc_time *tm) |
| 37 | { |
| 38 | struct starfire_rtc *p = dev_get_drvdata(dev); |
| 39 | unsigned long flags, secs; |
| 40 | |
| 41 | spin_lock_irqsave(&p->lock, flags); |
| 42 | secs = starfire_get_time(); |
| 43 | spin_unlock_irqrestore(&p->lock, flags); |
| 44 | |
| 45 | rtc_time_to_tm(secs, tm); |
| 46 | |
| 47 | return 0; |
| 48 | } |
| 49 | |
| 50 | static int starfire_set_time(struct device *dev, struct rtc_time *tm) |
| 51 | { |
| 52 | unsigned long secs; |
| 53 | int err; |
| 54 | |
| 55 | err = rtc_tm_to_time(tm, &secs); |
| 56 | if (err) |
| 57 | return err; |
| 58 | |
| 59 | /* Do nothing, time is set using the service processor |
| 60 | * console on this platform. |
| 61 | */ |
| 62 | return 0; |
| 63 | } |
| 64 | |
| 65 | static const struct rtc_class_ops starfire_rtc_ops = { |
| 66 | .read_time = starfire_read_time, |
| 67 | .set_time = starfire_set_time, |
| 68 | }; |
| 69 | |
| 70 | static int __devinit starfire_rtc_probe(struct platform_device *pdev) |
| 71 | { |
| 72 | struct starfire_rtc *p = kzalloc(sizeof(*p), GFP_KERNEL); |
| 73 | |
| 74 | if (!p) |
| 75 | return -ENOMEM; |
| 76 | |
| 77 | spin_lock_init(&p->lock); |
| 78 | |
| 79 | p->rtc = rtc_device_register("starfire", &pdev->dev, |
| 80 | &starfire_rtc_ops, THIS_MODULE); |
| 81 | if (IS_ERR(p->rtc)) { |
| 82 | int err = PTR_ERR(p->rtc); |
| 83 | kfree(p); |
| 84 | return err; |
| 85 | } |
| 86 | platform_set_drvdata(pdev, p); |
| 87 | return 0; |
| 88 | } |
| 89 | |
| 90 | static int __devexit starfire_rtc_remove(struct platform_device *pdev) |
| 91 | { |
| 92 | struct starfire_rtc *p = platform_get_drvdata(pdev); |
| 93 | |
| 94 | rtc_device_unregister(p->rtc); |
| 95 | kfree(p); |
| 96 | |
| 97 | return 0; |
| 98 | } |
| 99 | |
| 100 | static struct platform_driver starfire_rtc_driver = { |
| 101 | .driver = { |
| 102 | .name = "rtc-starfire", |
| 103 | .owner = THIS_MODULE, |
| 104 | }, |
| 105 | .probe = starfire_rtc_probe, |
| 106 | .remove = __devexit_p(starfire_rtc_remove), |
| 107 | }; |
| 108 | |
| 109 | static int __init starfire_rtc_init(void) |
| 110 | { |
| 111 | return platform_driver_register(&starfire_rtc_driver); |
| 112 | } |
| 113 | |
| 114 | static void __exit starfire_rtc_exit(void) |
| 115 | { |
| 116 | platform_driver_unregister(&starfire_rtc_driver); |
| 117 | } |
| 118 | |
| 119 | module_init(starfire_rtc_init); |
| 120 | module_exit(starfire_rtc_exit); |